Patent Grant
8003725
This invention relates to hetero-phase polyolefin compositions, such as polypropylene-based thermoplastic polyolefin compositions, for use in the manufacture of automotive components, among other uses, and for articles made from such compositions.
Multi-phase polyolefin compositions—often consisting of a “plastic” matrix phase and a “rubber” dispersed phase—are used in many applications that require a material that is lightweight, tough, stiff, and easily processed. Particularly successful in this respect are compositions based on a high-modulus polypropylene and a low-modulus polyolefin modifier, which are typically referred to as thermoplastic polyolefins, or TPOs. The modifier component has elastomeric characteristics and typically provides impact resistance, whereas the polypropylene component typically provides overall stiffness.
Commercially, the most common example of a TPO is a polypropylene impact copolymer (ICP). In an ICP, the matrix phase is essentially a propylene homopolymer (hPP) or random copolymer (RCP), and the dispersed phase is typically an ethylene or propylene copolymer with a relatively high comonomer content, traditionally an ethylene-propylene rubber (EPR). A third phase containing mostly comonomer, such as an ethylene homopolymer or copolymer (PE), as well as additives such as fillers, may also be present.
Low-crystallinity ethylene-alpha olefin copolymers have also been used instead of (or in addition to) EPR as the polyolefin modifier (or dispersed phase) in TPOs. The most common such ethylene-alpha olefin copolymers are so-called plastomers, which are often ethylene-butene, ethylene-hexene, or ethylene-octene copolymers with densities of 0.90 g/cm3 or less.
A major market for TPOs is in the manufacture of automotive parts, especially exterior parts like bumper fascia and body side-molding, and interior parts like instrument panels and side pillars. These parts, which have demanding stiffness and toughness (and, in some cases, uniform surface appearance) requirements, are generally made using an injection molding process. To increase efficiency and reduce costs, manufacturers have sought to decrease melt viscosity, decrease molding times, and reduce wall thickness in the molds, primarily by turning to high melt flow rate (MFR) polypropylenes (MFR greater than about 20, 25, or even 30 dg/min). However, these high MFR polypropylenes tend to be low in molecular weight, and therefore difficult to toughen, resulting in low impact strength especially at sub-ambient temperatures. To achieve a satisfactory balance of stiffness, toughness, and processibility, one option is to combine a moderate MFR polypropylene, a high content of polyolefin modifier (typically EPR and/or plastomer), and a reinforcing filler. Unfortunately, this approach has limitations in terms of the maximum MFR that can be achieved while still meeting the stiffness and toughness requirements. In addition, it can lead to poor surface appearance, in terms of the appearance of flow marks (or “tiger stripes”).
What is needed is a way to improve the MFR characteristics of a TPO without sacrificing its level of performance in terms of mechanical properties, including impact strength and/or stiffness, that are demanded for applications like automotive parts. One way to increase MFR is to add a low molecular weight compound, such as an even higher MFR polypropylene (hPP, RCP, or ICP). However, this approach compromises the balance of mechanical properties of the final blend by also lowering its sub-ambient impact strength. A fundamental problem is that typical TPO's based on polypropylene are brittle at even moderately low temperatures due to its relatively high glass transition temperature (˜0° C.). Therefore, there is a need for a low molecular weight additive that also lowers the glass transition temperature of the polypropylene component of a TPO. The plasticizers described herein accomplish this objective.
It would be particularly desirable to use a simple compound such as a conventional mineral oil as the low molecular weight additive for this purpose. After all, such compounds are routinely used as process oils or extender oils in polyolefin elastomers. However, it has been taught that conventional mineral oils, even paraffinic mineral oils, impair the properties of polyolefins, in particular semi-crystalline polyolefins (see WO 01/18109 A1 and Chemical Additives for the Plastics Industry, Radian Corp., 1987, p. 107-116). Indeed, such compounds are often detrimental to semicrystalline polypropylene, in that they migrate to the surface causing parts to become oily (except at very low concentrations), or they degrade mechanical properties because they fail to depress the glass transition temperature effectively. The plasticizers described herein overcome these limitations.
WO 04/014998 discloses blends of polyolefins with non-functionalized plasticizers. In particular, Tables 8, 11, and 21a to 22f describe blends of certain impact copolymers with certain liquids and/or plasticizers, and Tables 23a to 23f describe blends of a certain thermoplastic polyolefin composition with certain liquids and/or plasticizers. These blends however are unsuitable for automotive TPO applications because they do not have the appropriate balance of stiffness, toughness, and flow properties.
Plasticized polyolefin compositions and their applications are also described in WO 04/014997 and US 2004/260001. Additional references of interest include: U.S. Pat. Nos. 4,132,698, 4,536,537, 4,774,277, JP 09-208761, WO 98/44041, WO 03/48252, and US 2004/034148.
TPOs, including compositions that comprise polypropylene and or filler, are described in P
This invention relates to the use of certain of hydrocarbon liquids as plasticizers for hetero-phase polyolefin compositions based on polypropylene. Such compositions are especially useful in automotive components and other applications that demand high stiffness, excellent impact toughness at low temperatures, and good processibility during fabrication.
More specifically, this invention relates to a hetero-phase polyolefin composition comprising:
The following definitions are made for purposes of this invention and the claims thereto.
When a polymer or oligomer is referred to as comprising an olefin, the olefin present in the polymer or oligomer is the polymerized or oligomerized form of the olefin, respectively. The term polymer is meant to encompass homopolymers and copolymers. The term copolymer includes any polymer having two or more different monomers in the same chain, and encompasses random copolymers, statistical copolymers, interpolymers, and (true) block copolymers.
When a polymer blend is said to comprise a certain percentage of a monomer, that percentage of monomer is based on the total amount of monomer units in all the polymer components of the blend. For example if a blend comprises 50 wt % of polymer A, which has 20 wt % monomer X, and 50 wt % of a polymer B, which has 10 wt % monomer X, the blend comprises 15 wt % of monomer X.
A “polymer” has a number-average molecular weight (Mn) of 20 kg/mol or more, while an “oligomer” has a Mn of less than 20 kg/mol. Preferably, a polymer has a Mn of 40 kg/mol or more (preferably 60 kg/mol or more, preferably 80 kg/mol or more, preferably 100 kg/mol or more). Preferably, an oligomers has a Mn of less than 15 kg/mol (preferably less than 13 kg/mol, preferably less than 10 kg/mol, preferably less than 5 kg/mol, preferably less than 4 kg/mol, preferably less than 3 kg/mol, preferably less than 2 kg/mol, preferably less than 1 kg/mol).
A “polyolefin” is a polymer comprising at least 50 mol % of one or more olefin monomers. Preferably, a polyolefin comprises at least 60 mol % (preferably at least 70 mol %, preferably at least 80 mol %, preferably at least 90 mol %, preferably at least 95 mol %, preferably 100 mol %) of one or more olefin monomers, preferably 1-olefins, having carbon numbers of 2 to 20 (preferably 2 to 16, preferably 2 to 10, preferably 2 to 8, preferably 2 to 6). Preferably, a polyolefin has an Mn of 20 kg/mol or more, preferably 40 kg/mol or more (preferably 60 kg/mol or more, preferably 80 kg/mol or more, preferably 100 kg/mol or more).
An “isotactic” polyolefin has at least 10% isotactic pentads, a “highly isotactic” polyolefin has at least 50% isotactic pentads, and a “syndiotactic” polyolefin has at least 10% syndiotactic pentads, according to analysis by 13C-NMR. Preferably isotactic polymers have at least 20% (preferably at least 30%, preferably at least 40%) isotactic pentads. A polyolefin is “atactic” if it has less than 5% isotactic pentads and less than 5% syndiotactic pentads.
The terms “polypropylene” and “propylene polymer” mean a polyolefin comprising at least 50 mol % propylene units and having less than 35 mol % ethylene units. Preferably the “polypropylene” and “propylene polymer” comprise at least 60 mol % (preferably at least 70 mol %, preferably at least 80 mol %, preferably at least 90 mol %, preferably at least 95 mol %, preferably 100 mol %) propylene units; and have less than 35 mol % ethylene units. While propylene-rich ethylene/propylene copolymers are generically a class of propylene copolymer, a special distinction is made herein for the composition range commonly associated with EP Rubber, as defined below. The comonomers in a propylene copolymer are preferably chosen from among ethylene and C4 to C20 olefins (preferably ethylene and C4 to C8 1-olefins). The term “polypropylene” is meant to encompass isotactic polypropylene (iPP), highly isotactic polypropylene, syndiotactic polypropylene (sPP), homopolymer polypropylene (hPP, also called propylene homopolymer or homopolypropylene), and so-called random copolymer polypropylene (RCP, also called propylene random copolymer). Herein, an RCP is specifically defined to be a copolymer of propylene and 1 to 10 wt % of an olefin chosen from ethylene and C4 to C8 1-olefins. Preferably, the olefin comonomer in an RCP is ethylene or 1-butene, preferably ethylene.
The terms “polyethylene” and “ethylene polymer” mean a polyolefin comprising at least 50 mol % ethylene units and having less than 15 mol % propylene units. Preferably the “polyethylene” and “ethylene polymer” comprise at least 60 mol % (preferably at least 70 mol %, preferably at least 80 mol %, even preferably at least 90 mol %, even preferably at least 95 mol % or preferably 100 mole %) ethylene units; and have less than 15 mol % propylene units. While ethylene-rich ethylene/propylene copolymers are generically a class of ethylene copolymer, a special distinction is made herein for the composition range commonly associated with EP Rubber, as defined below. The comonomers in an ethylene copolymer are preferably chosen from C3 to C20 olefins (preferably C3 to C8 1-olefins). An “ethylene elastomer” is an ethylene copolymer having a density of less than 0.86 g/cm3. An “ethylene plastomer” (or simply a “plastomer”) is an ethylene copolymer having a density of 0.86 to 0.91 g/cm3. A “low density polyethylene” is an ethylene polymer having a density of more than 0.91 g/cm3 to less than 0.94 g/cm3; this class of polyethylene includes copolymers made using a heterogeneous catalysis process (often identified as linear low density polyethylene, LLDPE) and homopolymers or copolymers made using a high-pressure/free radical process (often identified as LDPE). A “high density polyethylene” (“HDPE”) is an ethylene polymer having a density of 0.94 g/cm3 or more.
The term “EP Rubber” means a copolymer of ethylene and propylene, and optionally one or more diene monomer(s), where the ethylene content is from 35 to 85 mol %, the total diene content is 0 to 5 mol %, and the balance is propylene with a minimum propylene content of 15 mol %.
The term “hetero-phase” refers to the presence of two or more morphological phases in a blend of two or more polymers, where each phase comprises a different ratio of the polymers as a result of partial or complete immiscibility (i.e., thermodynamic incompatibility). A common example is a morphology consisting of a “matrix” (continuous) phase and at least one “dispersed” (discontinuous) phase. The dispersed phase takes the form of discrete domains (particles) distributed within the matrix (or within other phase domains, if there are more than two phases). Another example is a co-continuous morphology, where two phases are observed but it is unclear which is the continuous phase and which is the discontinuous phase. The presence of multiple phases is determined using microscopy techniques, e.g., optical microscopy, scanning electron microscopy (SEM), or atomic force microscopy (AFM); or by the presence of two glass transition peaks in a dynamic mechanical analysis (DMA) experiment; in the event of disagreement among these methods, the AFM determination shall be used.
A “thermoplastic polyolefin” (TPO) is a specific type of hetero-phase polyolefin composition. These are blends of a high-crystallinity “base polyolefin” (typically having a melting point of 100° C. or more) and a low-crystallinity or amorphous “polyolefin modifier” (typically having a Tg of −20° C. or less). The hetero-phase morphology consists of a matrix phase comprised primarily of the base polyolefin, and a dispersed phase (which is not, or only modestly, cross-linked) comprised primarily of the polyolefin modifier. Thus, the matrix phase has a modulus that is higher, often substantially higher, than that of the dispersed phase. TPO compositions may also comprise components such as fillers, additives, and other useful compounding ingredients.
A “polypropylene-based thermoplastic polyolefin” (or equivalently, a “polypropylene-based TPO”) is a specific type of TPO, in that the matrix phase comprises primarily a high-crystallinity polypropylene having a melting point (Tm) of 100° C. or more, and the dispersed phase comprises primarily a polyolefin having a glass transition temperature (Tg) of −20° C. or less. Preferably, the matrix phase comprises primarily homopolymer polypropylene (hPP) and/or random copolymer polypropylene (RCP) with relatively low comonomer content (less than 5 wt %), and has a melting point of 110° C. or more (preferably 120° C. or more, preferably 130° C. or more, preferably 140° C. or more, preferably 150° C. or more, preferably 160° C. or more). Preferably, the dispersed phase comprises primarily one or more ethylene copolymer(s) with relatively high comonomer content (at least 5 wt %, preferably at least 10 wt %); and has a Tg of −30° C. or less (preferably −40° C. or less, preferably −50° C. or less).
A “polypropylene impact copolymer” (herein simply referred to as an “impact copolymer” (ICP)) is a specific type of polypropylene-based TPO, comprising 60 to 95 wt % of (A) hPP or RCP with a Tm of 120° C. or more, and 5 to 40 wt % of (B) propylene copolymer with a Tg of −30° C. or less. The morphology of an ICP is such that the matrix phase is comprised primarily of component (A) while the dispersed phase is comprised primarily of component (B). Preferably, the ICP comprises only two monomers: propylene and a single comonomer chosen from among ethylene and C4 to C8 1-olefins (preferably ethylene or 1-butene, preferably ethylene). Preferably, the (A) component has a Tm of 120° C. or more (preferably 130° C. or more, preferably 140° C. or more, preferably 150° C. or more, preferably 160° C. or more). Preferably, the (B) component is EP Rubber. Preferably, the (B) component has a Tg of −40° C. or less (preferably −50° C.).
An “in-situ ICP” is a specific type of ICP which is a reactor blend of the (A) and (B) components of an ICP, meaning (A) and (B) were made in separate reactors (or reactions zones) physically connected in series, with the effect that an intimately mixed final product is obtained in the product exiting the final reactor (or reaction zone). Typically, the components are produced in a sequential polymerization process, wherein (A) is produced in a first reactor is transferred to a second reactor where (B) is produced and incorporated as domains into the (A) matrix. There may also be a minor amount of a third component (C), produced as a byproduct during this process, comprising primarily the non-propylene comonomer (e.g., (C) will be an ethylene polymer if ethylene is used as the comonomer). In the literature, especially in the patent literature, an in-situ ICP is sometimes identified as “reactor-blend ICP” or a “block copolymer”, although the latter term is misleading since there is at best only a very small fraction of molecules that are (A)-(B) copolymers.
An “ex-situ ICP” is a specific type of ICP which is a physical blend of (A) and (B), meaning (A) and (B) were synthesized independently and then subsequently blended typically using a melt-mixing process, such as an extruder. An ex-situ ICP is distinguished by the fact that (A) and (B) are collected in solid form after exiting their respective synthesis processes, and then combined; whereas for an in-situ ICP, (A) and (B) are combined within a common synthesis process and only the blend is collected in solid form.
For purposes of this invention, TPO compositions do not include those hetero-phase polyolefins generally referred to as “Thermoplastic Vulcanizates” (TPVs). These are blends of a high-crystallinity polypropylene and a low-crystallinity or amorphous polyolefin modifier (often an ethylene-propylene elastomer) which is highly cross-linked (vulcanized) through the use of a cross-linking agent to provide a rubber-like resilience to the composition, and optionally other compounding ingredients; see, for example, U.S. Pat. No. 4,311,628. The polyolefin modifier in hetero-phase polyolefin compositions of the instant invention are not crosslinked to an appreciable extent. That is, the so-called “gel content” of the composition is low, so that preferably less than 50 wt %, preferably less than 40 wt %, preferably less than 30 wt %, preferably less than 20 wt %, preferably less than 10 wt %, preferably less than 5 wt %, preferably 0%) of the polyolefin modifier is insoluble in boiling xylene.
A “liquid” is defined to be a material that flows at room temperature, having a pour point of less than +20° C. and a kinematic viscosity at 25° C. of 30,000 cSt or less.
The term “paraffin” refers to saturated hydrocarbons, including normal paraffins, branched paraffins, isoparaffins, cycloparaffins, and blends thereof, and may be derived synthetically or from refined crude oil by means known in the art. More specifically, the following terms have the indicated meanings: “isoparaffins” are branched chain-type saturated hydrocarbons (i.e., branched alkanes, having at least one tertiary or quaternary carbon atom), which possess at least one C1 to C18 (more commonly C1 to C10) alkyl branch along at least a portion of each chain; “normal paraffins” are un-branched chain-type saturated hydrocarbons (i.e., normal alkanes); and “cycloparaffins” (also known as “naphthenes”) are cyclic (mono-ring and/or multi-ring) saturated hydrocarbons and branched cyclic saturated hydrocarbons. For each class of paraffin, various structural isomers will typically be present for each carbon number. Unsaturated hydrocarbons include alkenes (olefins, diolefins, etc.), alkynes, and “aromatics” (unsaturated mono-ring and/or multi-ring cyclic moieties, including branched cyclic unsaturated hydrocarbons).
The term “mineral oil” includes any hydrocarbon liquid of lubricating viscosity (i.e., a kinematic viscosity at 100° C. of 1 cSt or more) derived from petroleum crude oil and subjected to one or more refining and/or hydroprocessing steps (such as fractionation, hydrocracking, dewaxing, isomerization, and hydrofinishing) to purify and chemically modify the components to achieve a final set of properties. Such “refined” oils are in contrast to “synthetic” oils, which are manufactured by combining monomer units using catalysts and/or heat. In the lubricant industry, refined “basestocks” (which are mineral oils) are commonly divided into three categories based on their properties, as follows:
However, even if a mineral oil is not specifically identified by one of these basestocks classification, it is still possible to categorize it using this scheme. Accordingly, herein, a “Group III Mineral Oil” is defined to be a mineral oil having a viscosity index of 120 or more, whereas a “Group III basestock” is defined according to the above table; therefore, any Group III basestock will also be a Group III Mineral Oil, but the opposite is not necessarily true.
In the polymer industry, mineral oils are often called “process oils” (or “extender oils”). A common classification system for process oils is to identify them as either “paraffinic”, “naphthenic”, or “aromatic” mineral (or process or extender) oils based on the relative content of paraffinic, naphthenic, and aromatic moieties (see Typical in the table below). Herein, the three common classes are defined based on the compositions described under Definitions in the table below:
where CP, CN, and CA indicate the percentage of carbons in paraffinic chain-like (i.e., isoparaffinic and normal paraffinic) structures, naphthenic (i.e., saturated ring) structures, and aromatic (i.e., unsaturated ring) structures, respectively.
The term “substantially absent” means that the compounds in question are not added deliberately to the compositions and, if present, are present at less than 1 wt %, based upon the total weight of the composition. Preferably, the compounds in question are present at less than 0.5 wt % (preferably less than 0.1 wt %, preferably less than 0.05 wt %, preferably less than 0.01 wt %, preferably less than 0.001 wt %), based upon the total weight of the composition.
For purpose of this invention and the claims thereto, unless otherwise noted, physical and chemical properties described herein are measured using the test methods described under the Experimental Methods section.
This invention relates to plasticized hetero-phase polyolefin compositions comprising a polypropylene-based TPO, one or more non-functionalized plasticizers, and one or more filler.
The non-functionalized plasticizer (NFP) compounds of the present invention are hydrocarbon liquids with certain characteristics as described herein. We discovered that addition of one or more NFP improves the overall performance of polypropylene-based TPO compositions that meet the stringent array of mechanical property requirements for automotive (and other) applications. In particular, these compositions exhibit better processibility than can be achieved using previous formulation approaches. Generally, the compositions comprise a polypropylene-based TPO, an NFP, and a filler, and optionally additives.
More specifically, this invention relates to a hetero-phase polyolefin composition comprising:
The polypropylene-based TPO may be an impact copolymer (especially an in-situ ICP), or it may be a physical blend of an ICP with a plastomer and/or ethylene-propylene rubber (EP Rubber), or it may be a physical blend of a propylene polymer (especially a homopolymer polypropylene (hPP) or a random copolymer polypropylene (RCP)) with a plastomer and/or EP Rubber. Preferred polymeric components are described more fully below. In a preferred embodiment, the polypropylene-based TPO comprises a matrix having a melting point (Tm) of 110° C. or more (preferably 120° C. or more, preferably 125° C. or more, preferably 130° C. or more, preferably 140° C. or more, preferably 150° C. or more, preferably 160° C. or more). In another preferred embodiment, the polypropylene-based TPO comprises a dispersed phase having a glass transition temperature (Tg) of −20° C. or less (preferably −25° C. or less, preferably −30° C. or less, preferably −35° C. or less, preferably −40° C. or less, preferably −45° C. or less, preferably −50° C. or less, preferably −55° C. or less).
The non-functional plasticizer (NFP) may be a PAO oligomer, or it may be a Group III Mineral Oil, or it may be a GTL basestock, or it may be an Exceptional Paraffinic Process Oil. Preferably, the NFP has a kinematic viscosity at 100° C. of 5 cSt or more, a viscosity index of 100 or more, a pour point of −20° C. or less, a specific gravity less than 0.86, and a flash point greater than 200° C. Preferred NFPs are described more fully below.
The filler may be inorganic mineral particulates, inorganic fibers, or engineering thermoplastic fibers. Preferred fillers are described more fully below.
Hetero-Phase Polyolefin Composition
In one embodiment, this invention relates to a hetero-phase polyolefin composition comprising:
In another embodiment, this invention relates to a hetero-phase polyolefin composition comprising:
In another embodiment, this invention relates to a hetero-phase polyolefin composition comprising:
In another embodiment, this invention relates to a hetero-phase polyolefin composition comprising:
In another embodiment, this invention relates to a hetero-phase polyolefin composition comprising:
In another embodiment, this invention relates to a hetero-phase polyolefin composition comprising:
In another embodiment, this invention relates to a hetero-phase polyolefin composition comprising:
In any of the above embodiments that comprise one or more ICP(s), preferably at least one of the ICP(s) is an in-situ ICP; more preferably all the ICP(s) are in-situ ICP(s). Alternately, the combination of ICP(s) comprises two in-situ ICPs; alternately, the composition comprises only one in-situ ICP.
In any of the above embodiments that comprise one or more propylene polymers(s): Preferably the propylene polymer of the combination of propylene polymer(s) has a melting point of at least 110° C. (preferably at least 120° C., preferably at least 130° C., preferably at least 140° C., preferably at least 150° C., preferably at least 160° C., preferably at least 165° C.).
In any of the above embodiments that comprise one or more ethylene copolymer(s): Preferably the ethylene copolymer or the combination of ethylene copolymer(s) has a density of less than 0.90 g/cm3 (preferably less than 0.89 g/cm3, preferably less than 0.88 g/cm3, preferably less than 0.87 g/cm3).
In any of the above embodiments that comprise one or more EP Rubber(s): Preferably the EP Rubber or the combination of EP Rubber(s) has density of less than 0.87 g/cm3 (preferably less than 0.86 g/cm3).
In any of the above embodiments, preferably the NFP has a kinematic viscosity at 100° C. of 4 cSt or more (preferably 6 cSt or more, preferably 8 cSt or more, preferably 10 cSt or more), a viscosity index of 100 or more (preferably 110 or more, preferably 120 or more, preferably 130 or more), a pour point of −15° C. or less (preferably −20° C. or less, preferably −25° C. or less, preferably −30° C. or less), a flash point of 200° C. or more (preferably 220° C. or more, preferably 240° C. or more, preferably 260° C. or more), and a specific gravity of 0.88 or less (preferably 0.87 or less, preferably 0.86 or less).
In any of the above embodiments, preferably the filler is an inorganic mineral filler with a median particle diameter of less than 50 microns.
In a preferred embodiment, any hetero-phase polyolefin composition of the present invention has:
In another embodiment, the hetero-phase polyolefin composition in the absence of any optional additives has a fogging number (SAE J1756) of 80 or more (preferably 90 or more, preferably 95 or more, preferably 98 or more).
Changes in Properties of the Blend with Addition of NFP
Preferred compositions of the present invention can be characterized in that the glass transition temperature (Tg) of at least one polymer component in the composition is depressed by at least 2° C. (preferably at least 4° C., preferably at least 6° C., preferably at least 8° C., preferably at least 8° C., preferably at least 10° C.) for every 1 wt % of NFP present in the composition, while the peak melting temperature of the highest melting component remains within 5° C. (preferably within 4° C., preferably within 3° C., preferably within 2° C.) of its value for the same composition absent the NFP.
Preferred compositions of the present invention can be characterized in that the glass transition temperature (Tg) of at least one component in the composition is depressed at least 2° C. (preferably at least 4° C., preferably at least 6° C., preferably at least 8° C., preferably at least 10° C., preferably at least 12° C., preferably at least 15° C., preferably at least 20° C.) relative to its value for the same composition absent the NFP, while the peak melting temperature of the highest melting component remains within 5° C. (preferably within 4° C., preferably within 3° C., preferably within 2° C.) of its value for the same composition absent the NFP.
Preferred compositions of the present invention can be characterized in that the weight loss of the composition containing the NFP is less than 3% (preferably less than 2%, preferably less than 1%) when permanence of the NFP is determined as described in the Experimental Methods section. Weight loss here refers to the reduction in weight in excess of that measured for the same composition without the NFP under the same test conditions.
Preferred compositions of the present invention can be characterized in that the melt flow rate (MFR) of the composition increases by at least 2% (preferably at least 4%, preferably at least 6%, preferably at least 8%, preferably at least 10%, preferably at least 12%, preferably at least 15%, preferably at least 20%) for every 1 wt % of NFP present in the composition as compared to the same composition absent the NFP.
In another embodiment, the hetero-phase polyolefin composition exhibits reduced flow marks, either in severity (visibility rating) or tendency (onset distance from gate) as compared to the same hetero-phase polyolefin composition without NFP (i.e., where the ratio of the remaining component weight fractions is the unchanged). Preferably, the compositions of this invention have a flow mark visibility rating of 3 or less (preferably 2 or less, preferably 1 or less, preferably 0). Preferably, the distance from the gate to the first visible flow mark is 5 in or more (preferably 7 in or more, preferably 9 in or more, preferably 11 in or more, preferably 13 in or more). Preferably, no flow marks are detected. Flow marks are evaluated following the protocol outlined in the Experimental Methods section.
In another embodiment, the hetero-phase polyolefin composition exhibits an equal or better scratch resistance rating as compared the same hetero-phase polyolefin composition without NFP (i.e., where the ratio of the remaining component weight fractions is the unchanged). Preferably, the compositions of this invention have a scratch resistance rating of 3 N or more (preferably 5 N or more, preferably 7 N or more, preferably 10 N or more, preferably 12 N or more). The scratch resistance rating is determined following the protocol outlined in the Experimental Methods section.
Polyolefins
The hetero-phase polyolefin compositions of the present invention include one or more matrix phase component(s), comprised of polypropylene impact copolymer (ICP) and/or propylene homopolymer or copolymer, as well as one or more dispersed phase component(s), comprised of ethylene copolymer and/or EP Rubber. The classes of materials described herein that are useful for the matrix phase can be utilized alone or admixed to obtain desired properties. The classes of materials described herein that are useful for the dispersed phase can be utilized alone or admixed to obtain desired properties. Any polymeric component useful in the present invention may be described by any number of, or any combination of, parameters described herein.
Polypropylene Impact Copolymer (ICP)
The ICP comprises a polypropylene component (A) of hPP or RCP, and a rubber component (B) of propylene copolymer. The morphology is such that the matrix phase is comprised primarily of (A) while the dispersed phase is comprised primarily of (B). Preferred ICPs useful in this invention include those having one or more of the following properties:
Comonomers used in conjunction with propylene to make an ICP are chosen from ethylene and C4 to C8 1-olefins, preferably from ethylene and 1-butene. In a preferred embodiment, the comonomer is ethylene and is present in the ICP at 1 to 50 wt % (preferably 2 to 40 wt %, preferably 3 to 30 wt %, preferably 5 to 20 wt %) based on the weight of the ICP. In another preferred embodiment, the rubber component of the ICP comprises 20 to 75 wt % (preferably 25 to 70 wt %, preferably 30 to 65 wt %, preferably less than 60 wt %) ethylene, and the balance propylene, based on the weight of the rubber component. More than one comonomer may also be employed, preferable selected from ethylene and C4 to C8 1-olefins, such as ethylene and butene-1 or ethylene and hexene-1, such that the rubber component comprises a propylene terpolymer.
In-situ ICPs are particularly preferred. For in-situ ICPs, the polypropylene (A) and rubber (B) components may be made using any appropriate polymerization process, including gas-phase, solution, slurry, and high-pressure polymerization processes. Preferably, (A) is made in a solution or slurry process, and (B) is made in a gas-phase process. More preferably, the in-situ ICP is made using a slurry reactor to produce an hPP (A) component, and a gas-phase reactor to produce an EP Rubber (B) component. The in-situ ICP polymerization processes may employ any appropriate polymerization catalyst or combination of catalysts, including Ziegler-Natta and/or single-site (e.g., metallocene) polymerization catalysts, which may be supported (for use in heterogeneous catalysis processes) or not (for use in homogeneous catalysis processes). Preferably, (A) and (B) are made using a common supported Ziegler-Natta or single-site catalyst.
In another embodiment, the rubber component comprises a propylene copolymer with a weight-average molecular weight (Mw) of at least 50 kg/mol (preferably 100 kg/mol, preferably 150 kg/mol, preferably 200 kg/mol); a molecular weight distribution (Mw/Mn) of less than 3.5 (preferably less than 3.0, preferably 1.8 to 2.5); and a CDBI of greater than 60% (preferably greater than 65%, preferably greater than 70%, preferably greater than 75%, preferably greater than 80%, preferably greater than 85%). CDBI is a measure of the composition distribution of monomer within the polymer chains. It is measured as described in WO 93/03093, with the modification that any fractions having a weight-average molecular weight (Mw) below 20 kg/mol are ignored in the calculation.
In-situ ICPs useful in the present invention are commercially available from many manufacturers, including ExxonMobil Chemical, Borealis, Dow Chemical (including INSPIRE™ grades), Sunoco Chemical, and Total Petrochemicals. Suitable examples include:
ExxonMobil Chemical In-Situ ICPs
Dow Chemical In-Situ ICPs
Sunoco Chemical In-Situ ICPs
Suitable ICPs are also commercially available from Basell Polyolefins, including “Advanced Polyolefins” grades made using their CATALLOY™ polymerization process, some of which are commercially available under the ADFLEX™ tradename. Basell also sells ICPs under the HIFAX™ and PROFAX™ tradenames. Examples include:
Basell Polyolefins In-Situ ICPs
Useful in-situ-impact copolymers may be prepared by the process described in U.S. Pat. Nos. 4,379,759; 6,342,566; and 6,384,142. A general description of in-situ ICPs can be found in P
Propylene Polymers (Homopolymers and Copolymers)
Preferred propylene polymers (homopolymers and copolymers) useful in this invention include those having one or more of the following properties:
In a preferred embodiment, the propylene polymer is selected from polypropylene homopolymer, polypropylene copolymers, and blends thereof. The homopolymer may be atactic polypropylene, isotactic polypropylene, highly isotactic polypropylene, syndiotactic polypropylene, and blends thereof. The copolymer can be a random copolymer, a statistical copolymer, a block copolymer, and blends thereof.
The method of making the polypropylene is not critical, as it can be made by slurry, solution, gas-phase, high-pressure, or other suitable processes, through the use of catalyst systems appropriate for the polymerization of polyolefins, such as Ziegler-Natta-type catalysts, metallocene-type catalysts, other appropriate catalyst systems or combinations thereof. In a preferred embodiment the propylene polymers are made by the catalysts, activators and processes described in U.S. Pat. Nos. 6,342,566, 6,384,142, WO 03/040201, WO 97/19991 and U.S. Pat. No. 5,741,563. Such catalysts are well known in the art, and are described in, for example, Z
Polypropylene homopolymers or copolymers useful in the present invention may have some level of isotacticity or syndiotacticity. In one embodiment, the polypropylene is isotactic polypropylene, and in another embodiment, the polypropylene is highly isotactic polypropylene. In a desirable embodiment, the polypropylene is a polypropylene homopolymer having at least 85% (preferably at least 90%) isotactic pentads. In another desirable embodiment, the polypropylene is a polypropylene homopolymer having at least 85% (preferably at least 90%) syndiotactic pentads.
In a particularly preferred embodiment, the propylene polymers useful herein are produced by a metallocene catalyst system, and have a Mw/Mn of 1.5 to 3 (preferably 1.8 to 2.5) and a CDBI of 80 wt % or more (preferably 90 wt % or more).
In another embodiment the propylene polymer is a random copolymer, also known as an “RCP,” comprising propylene and up to 20 mole % of ethylene or a C4 to C20 olefin, preferably up to 20 mole % ethylene, preferably from 1 to 10 mole % ethylene.
Propylene polymers that are useful in this invention include hPP and RCP grades commercially available from many manufacturers, including ExxonMobil Chemical (including hPP grades sold under the ACHIEVE™ tradename), Basell Polyolefins, Borealis, Dow Chemical, Sunoco Chemical, and Total Petrochemicals.
Ethylene Copolymers
Preferred ethylene copolymers useful in this invention include those having one or more of the following properties:
In preferred embodiment, the ethylene copolymer is an ethylene-based plastomer with a density of 0.86 to 0.91 g/cm3 (preferably 0.86 to 0.90 g/cm3, preferably 0.86 to 0.89 g/cm3, preferably 0.86 to 0.88 g/cm3, preferably 0.86 to 0.87 g/cm3). Preferred plastomers comprise less than 85 wt % (preferably less than 75 wt %) ethylene and up to 50 wt % (preferably 20 to 40 wt %) of one or more olefin comonomers selected from propylene and C4-C20 olefins (preferably 1-butene, 1-hexene, and/or 1-octene).
In another preferred embodiment, the ethylene copolymer is an ethylene elastomer with a density of less than 0.86 g/cm3, comprised of ethylene and at least 30 wt % of one or more C4-C20 olefin comonomers (preferably 1-butene, 1-hexane, and/or 1-octene).
In any embodiment, the ethylene copolymer can be a random copolymer, a statistical copolymer, a block copolymer, and blends thereof.
The method of making the ethylene copolymer is not critical, as it can be made by slurry, solution, gas-phase, high-pressure, or other suitable processes, through the use of catalyst systems appropriate for the polymerization of polyolefins, such as Ziegler-Natta catalysts, metallocene catalysts, other appropriate catalyst systems or combinations thereof.
In a particularly preferred embodiment, the ethylene copolymers useful herein are produced using a metallocene catalyst system, i.e., a mono- or bis-cyclopentadienyl transition metal catalysts in combination with an activator of alumoxane and/or a non-coordinating anion in solution, slurry, high-pressure, or gas-phase. The catalyst and activator may be supported or unsupported and the cyclopentadienyl rings by may substituted or unsubstituted. For more information on the methods and catalysts/activators to produce such mPE homopolymers and copolymers see WO 94/26816; WO 94/03506; EPA 277,003; EPA 277,004; U.S. Pat. No. 5,153,157; U.S. Pat. No. 5,198,401; U.S. Pat. No. 5,240,894; U.S. Pat. No. 5,017,714; CA 1,268,753; U.S. Pat. No. 5,324,800; EPA 129,368; U.S. Pat. No. 5,264,405; EPA 520,732; WO 92 00333; U.S. Pat. No. 5,096,867; 5,507,475; EPA 426 637; EPA 573 403; EPA 520 732; EPA 495 375; EPA 500 944; EPA 570 982; WO91/09882; WO94/03506; and U.S. Pat. No. 5,055,438. More generally, preferred plastomers are produced using a single-site catalyst, whether a metallocene catalyst or not, and have a Mw/Mn of 1.5 to 3 (preferably 1.8 to 2.5) and a CDBI of 70% or more (preferably 80% or more, preferably 90% or more).
Plastomers that are useful in this invention include those available from ExxonMobil Chemical (sold under the EXACT™ tradename), Dow Chemical (sold under the AFFINITY™, ENGAGE™, and FLEXOMER™ tradenames), and Mitsui Chemicals (sold under the TAFMER™ tradename). Examples include:
ExxonMobil Chemical EXACT™ Plastomers
EP Rubbers
Preferred EP Rubbers useful in this invention include those having one or more of the following properties:
Particularly preferred EP Rubbers for use herein contain no diene (i.e., an ethylene-propylene copolymers). If diene is present (i.e., an ethylene-propylene-diene terpolymer), preferably the diene is a norbornene-derived diene such as ethylidene norbornene (ENB) or vinylidene norbornene (VNB). Diene content is measured by ASTM D 6047.
The method of making the EP Rubber is not critical, as it can be made by slurry, solution, gas-phase, high-pressure, or other suitable processes, through the use of catalyst systems appropriate for the polymerization of polyolefins, such as Ziegler-Natta catalysts, metallocene catalysts, other appropriate catalyst systems or combinations thereof.
In a particularly preferred embodiment, the EP Rubbers useful herein are produced using a vanadium-based catalyst system in a solution or slurry process. In another embodiment, the EP Rubbers useful herein are produced using a metallocene-based catalyst system in a solution or slurry process. In yet another embodiment, the EP Rubbers useful herein are produced using any single-sited catalyst system in a solution or slurry process. Preferably, the EP Rubbers made by a vanadium, metallocene, or other single-sited catalyst system has a molecular weight distribution (Mw/Mn) of 1.8 to 2.5.
EP Rubbers that are useful in this invention include those available from ExxonMobil Chemical (sold under the Vistalon™ tradename), including:
ExxonMobil Chemical Vistalon™ EP Rubbers
Non-Functionalized Plasticizer (NFP)
The hetero-phase polyolefin compositions of the present invention include at least one non-functionalized plasticizer (“NFP”). The classes of materials described herein that are useful as non-functionalized plasticizers can be utilized alone or admixed other NFPs described herein to obtain desired properties. Any NFP useful in the present invention may also be described by any number of, or any combination of, parameters described herein.
An NFP is defined to be a hydrocarbon liquid compound comprising carbon and hydrogen, having functional groups selected from hydroxide, aryls, substituted aryls, halogens, alkoxys, carboxylates, esters, carbon unsaturation, acrylates, oxygen, nitrogen, and carboxyl present to an unappreciable extent. By “unappreciable extent”, it is meant that these groups and compounds comprising these groups are not deliberately added to the NFP, and if present at all for any reason, are present at less than 5 wt %. Preferably the these groups and compounds are present at less than 4 wt %, preferably less than 3 wt %, preferably less than 2 wt %, preferably less than 1 wt %, preferably less than 0.7 wt %, preferably less than 0.5 wt %, preferably less than 0.3 wt %, preferably less than 0.1 wt %, preferably less than 0.05 wt %, preferably less than 0.01 wt %, preferably less than 0.001 wt %), based upon the weight of the NFP.
In one embodiment, aromatic moieties (including compounds whose molecules have the ring structure characteristic of benzene, naphthalene, phenanthrene, anthracene, etc.) are substantially absent from the NFP. In another embodiment, naphthenic moieties (including compounds whose molecules have a saturated ring structure such as would be produced by hydrogenating benzene, naphthalene, phenanthrene, anthracene, etc.) are substantially absent from the NFP.
In another embodiment, the NFP is a hydrocarbon that contains olefinic unsaturation to an unappreciable extent. By “unappreciable extent of olefinic unsaturation” it is meant that the carbons involved in olefinic bonds account for less than 10% (preferably less than 8%, preferably less than 6%, preferably less than 4%, preferably less than 2%, preferably less than 1%, preferably less than 0.7%, preferably less than 0.5%, preferably less than 0.3%, preferably less than 0.1%, preferably less than 0.05%, preferably less than 0.01%, preferably less than 0.001%) of the total number of carbons. In some embodiments, the percent of carbons of the NFP involved in olefinic bonds is between 0.001 and 10% of the total number of carbon atoms in the NFP (preferably between 0.01 and 5%, preferably between 0.1 and 2%, preferably less than 1%).
In another embodiment, the NFP comprises C6 to C200 paraffins, and C8 to C100 paraffins in another embodiment. In another embodiment, the NFP consists essentially of C6 to C200 paraffins, or essentially of C8 to C100 paraffins in another embodiment. In yet another embodiment, the NFP comprises C20 to C1500 paraffins, preferably C25 to C500 paraffins, preferably C25 to C500 paraffins, preferably C30 to C500 paraffins, preferably C40 to C500 paraffins, preferably C40 to C250 paraffins, preferably C30 to C150 paraffins, preferably C20 to C100 paraffins. In a preferred embodiment, the NFP comprises oligomers of C5 to C24 olefins.
Particularly preferred NFPs include a) isoparaffins, b) PAOs, c) Group III Mineral Oils, d) high purity hydrocarbon fluids derived from a so-called Gas-To-Liquids processes, and e) mineral oils; with a viscosity index greater than 100 (preferably greater than 120), pour point less than −15° C. (preferably less than −20° C.), specific gravity less than 0.86 (preferably less than 0.855), and flash point greater than 200° C. (preferably greater than 230° C.).
Isoparaffins
In one embodiment of the present invention, the NFP is an isoparaffin-rich hydrocarbon liquid with a pour point of −50° C. or less (preferably −60° C. or less) and a specific gravity of 0.84 or less (preferably 0.83 or less). By “isoparaffin-rich” is meant that the NFP comprises at least 50 wt % (preferably at least 60 wt %, preferably at least 70 wt %, preferably at least 80 wt %, preferably at least 90 wt %, preferably 100 wt %) of C6 to C150 (preferably C6 to C100, preferably C6 to C25, preferably C8 to C20) isoparaffins. Preferably the paraffin chains possess C1 to C10 alkyl branching along at least a portion of each paraffin chain, where any combination of regio and stereo placement of the alkyl branches may be involved. Isoparaffin liquids may also include a minor amount of (less than 50 wt %, preferably less than 30 wt %, preferably less than 10 wt %) of cycloparaffins with isoparaffinic branched side chains. Isoparaffins may include any combination of regio and stereo placement of the alkyl branches.
In one embodiment, the number-average molecular weight of the isoparaffin-rich fluid is in the range of 100 to 1000 (preferably 120 to 500, preferably 150 to 300) g/mol. In another embodiment, the isoparaffin-rich NFP has a kinematic viscosity at 40° C. of 1 to 15 cSt (preferably 2 to 10 cSt). In another embodiment, the isoparaffin-rich NFP has a kinematic viscosity at 25° C. of 1 to 30 cSt (preferably 2 to 25 cSt, preferably 3 to 20 cSt, preferably 5 to 15 cSt) and a glass transition temperature (Tg) that cannot be determined by ASTM E 1356 or if it can be determined then it is less than 0° C. (preferably less than −10° C., preferably less than −20° C., preferably less than −30° C.).
In another embodiment the isoparaffin-rich NFP has one or more of the following properties:
Suitable isoparaffin-rich hydrocarbon liquids are described in, for example U.S. Pat. Nos. 3,818,105, 3,439,088 and 6,197,285, and are commercially available under the tradename ISOPAR™ (ExxonMobil Chemical), some of which are summarized in the table below. Other suitable isoparaffin-rich hydrocarbon liquids are commercial available under the trade names SHELLSOL™ (Royal Dutch/Shell), SOLTROL™ (Chevron Phillips) and SASOL™ (Sasol Limited). The percentage of carbons in chain-type paraffinic structures (CP) in such liquids is close to 100% (95% or more).
ISOPAR™ Series Isoparaffins
In another embodiment, the isoparaffin-rich NFP is a mixture of branched and normal paraffins having 6 to 50 (preferably 8 to 40, preferably 10 to 30) carbon atoms in the molecule. The isoparaffin composition has a ratio of branch paraffin to n-paraffin of 1:1 to 100:1 (preferably 1:1 to 10:1). The distribution of branches in the isoparaffins of the mixture is such that at least 50% (preferably at least 70%) are methyl branches, with less than 50% (preferably less than 30%) of branches with carbon number greater than 1 (for example, ethyl, propyl, butyl or the like). The isoparaffinic mixture boils within a range of from 100 to 350° C. (preferably from 110 to 320° C.) and with a narrow boiling range (preferably 35° C. or less). These branch paraffin/n-paraffin blends are described in, for example, U.S. Pat. No. 5,906,727.
Polyalphaolefins
In another embodiment of the present invention, the NFP comprises a polyalphaolefin (PAO) liquid with a pour point of −10° C. or less and a kinematic viscosity at 100° C. of 3 cSt or more. In general, a PAO liquid comprises hydrocarbon oligomers manufactured by catalytic oligomerization of alpha-olefins, preferably linear alpha-olefins. A PAO may be characterized by any type of tacticity, including isotactic or syndiotactic and/or atactic, and by any degree of tacticity, including isotactic-rich or syndiotactic-rich or fully atactic. PAO liquids are described in, for example, U.S. Pat. Nos. 3,149,178; 4,827,064; 4,827,073; 5,171,908; and 5,783,531 and in S
PAO liquids may be conveniently prepared by the oligomerization of an α-olefin in the presence of a polymerization catalyst, such as a Friedel-Crafts catalyst (including, for example, AlCl3, BF3, and complexes of BF3 with water, alcohols, carboxylic acids, or esters), a coordination complex catalyst (including, for example, the ethylaluminum sesquichloride+TiCl4 system), or a homogeneous or heterogeneous (supported) catalyst more commonly used to make polyethylene and/or polypropylene (including, for example, Ziegler-Natta catalysts, metallocene or other single-site catalysts, and chromium catalysts).
In one embodiment, the PAO comprises C15 to C1500 (preferably C20 to C1000, preferably C30 to C800, preferably C35 to C400, most preferably C40 to C250) oligomers of alpha-olefins. These oligomers are dimers, trimers, tetramers, pentamers, etc. In another embodiment, the PAO comprises C3 to C24 (preferably C5 to C18, preferably C6 to C14, even preferably C8 to C12, most preferably C10) branched or linear alpha-olefins, provided that C3 and C4 alpha-olefins are present at 10 wt % or less. In another embodiment, the PAO comprises C3 to C24 (preferably C5 to C8, preferably C6 to C14, most preferably C8 to C12) linear alpha-olefins (LAOs), provided that C3 and C4 LAOs are present at 10 wt % or less. Suitable olefins include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, and blends thereof. Oligomers of LAOs with only even carbon numbers between 6 and 18 (inclusive) are particularly preferred.
In one embodiment, a single LAO is used to prepare the oligomers. In this case, a preferred embodiment involves the oligomerization of 1-decene, and the PAO is a mixture of oligomers (including, for example, dimers, trimers, tetramers, pentamers, and higher) of 1-decene. In another embodiment, the PAO comprises oligomers of two or more C3 to C18 LAOs (preferably C5 to C18 LAOs), to make ‘bipolymer’ or ‘terpolymer’ or higher-order copolymer combinations, provided that C3 and C4 LAOs are present at 10 wt % or less. In this case, a preferred embodiment involves the oligomerization of a mixture of 1-octene, 1-decene, and 1-dodecene, and the PAO is a mixture of oligomers (for example, dimers, trimers, tetramers, pentamers, and higher) of 1-octene/1-decene/1-dodecene ‘terpolymer’.
In another embodiment, the PAO comprises oligomers of a single alpha-olefin species having a carbon number of 5 to 24 (preferably 6 to 18, preferably 8 to 12, most preferably 10). In another embodiment, the NFP comprises oligomers of mixed alpha-olefins (i.e., involving two or more alpha-olefin species), each alpha-olefin having a carbon number of 3 to 24 (preferably 5 to 24, preferably 6 to 18, most preferably 8 to 12), provided that alpha-olefins having a carbon number of 3 or 4 are present at 10 wt % or less. In a particularly preferred embodiment, the PAO comprises oligomers of mixed alpha-olefins (i.e., involving two or more alpha-olefin species) where the weighted average carbon number for the alpha-olefin mixture is 6 to 14 (preferably 8 to 12, preferably 9 to 11).
In another embodiment, the PAO comprises oligomers of one or more α-olefin with repeat unit formulas of
—[CHR—CH2]—
where R is a C3 to C18 saturated hydrocarbon branch. Preferably, R is constant for all oligomers. In another embodiment, there is a range of R substituents covering carbon numbers from 3 to 18. Preferably, R is linear, i.e.,
The PAO may be atactic, isotactic, or syndiotactic. In one embodiment, the PAO has essentially the same population of meso [m] and racemic [r] dyads (preferably neither [m] nor [r] greater than 60%, preferably neither greater than 55%) as measured by 13C-NMR, making it atactic. In another embodiment, the PAO has more than 60% (preferably more than 70%, preferably more than 80%, preferably more than 90%) meso dyads [m]. In another embodiment, the PAO has more than 60% (preferably more than 70%, preferably more than 80%, preferably more than 90%) racemic dyads [r]. In one embodiment, [m]/[r] determined by 13C-NMR is between 0.9 and 1.1 in one embodiment, [m]/[r] is greater than 1 in another embodiment, and [m]/[r] is less than 1 in yet another embodiment.
Preferred PAOs have a “branching ratio” as defined in U.S. Pat. No. 4,827,064 and measured according to the method described therein, of 0.20 or less (preferably 0.19 or less, preferably 0.18 or less, preferably 0.17 or less, preferably 0.15 or less, preferably 0.12 or less, preferably 0.10 or less).
In one embodiment of the present invention, the PAO has a number average molecular weight of from 100 to 20,000 g/mol (preferably 300 to 15,000 g/mol, preferably 400 to 10,000 g/mol, preferably 500 to 5,000 g/mol, preferably 600 to 3,000 g/mol, preferably 600 to 1,500 g/mol).
In a preferred embodiment, the PAO has a kinematic viscosity at 100° C. of 3 cSt or more (preferably 5 cSt or more, preferably 6 cSt or more, preferably 8 cSt or more, preferably 10 cSt or more, preferably 20 cSt or more, preferably 30 cSt or more, preferably 40 cSt or more, preferably 100 or more, preferably 150 cSt or more). In another embodiment, the PAO has a kinematic viscosity at 100° C. of 300 cSt or less (preferably 100 cSt or less). In another embodiment, the PAO has a kinematic viscosity at 100° C. of 3 to 3,000 cSt (preferably 4 to 1,000 cSt, preferably 6 to 300 cSt, preferably 8 to 150 cSt, preferably 8 to 100 cSt, preferably 8 to 40 cSt). In another embodiment, the PAO has a kinematic viscosity at 100° C. of 10 to 1000 cSt (preferably 10 to 300 cSt, preferably 10 to 100 cSt). In yet another embodiment, the PAO has a kinematic viscosity at 100° C. of about 4 to 8 cSt. In yet another embodiment, the PAO has a kinematic viscosity at 100° C. of 1 to 3 cSt.
In another preferred embodiment, the PAO has a Viscosity Index of 120 or more (preferably 130 or more, preferably 140 or more, preferably 150 or more, preferably 170 or more, preferably 190 or more, preferably 200 or more, preferably 250 or more, preferably 300 or more). In another embodiment, the PAO or blend of PAOs has a viscosity Index of 120 to 350 (preferably 130 to 250).
In yet another preferred embodiment, the PAO has a pour point of −10° C. or less (preferably −20° C. or less, preferably −25° C. or less, preferably −30° C. or less, preferably −35° C. or less, preferably −40° C. or less, preferably −50° C. or less). In another embodiment, the PAO or blend of PAOs has a pour point of −15 to −70° C. (preferably −25 to −60° C.).
In yet another preferred embodiment, the PAO has a glass transition temperature (Tg) of −40° C. or less (preferably −50° C. or less, preferably −60° C. or less, preferably −70° C. or less, preferably −80° C. or less). In another embodiment, the PAO or blend of PAOs has a Tg of −50 to −120° C. (preferably −60 to −100° C., preferably −70 to −90° C.).
In yet another preferred embodiment, the PAO has a flash point of 200° C. or more (preferably 210° C. or more, preferably 220° C. or more, preferably 230° C. or more), preferably between 240° C. and 290° C.
In yet another preferred embodiment, the PAO has a specific gravity (15.6/15.6° C.) of 0.86 or less (preferably 0.855 or less, preferably 0.85 or less, preferably 0.84 or less).
Particularly preferred PAOs are those having A) a flash point of 200° C. or more (preferably 210° C. or more, preferably 220° C. or more, preferably 230° C. or more); and B) a pour point less than −20° C. (preferably less than −25° C., preferably less than −30° C., preferably less than −35°, preferably less than −40° C.) and/or a kinematic viscosity at 100° C. of 10 cSt or more (preferably 35 cSt or more, preferably 40 cSt or more, preferably 50 cSt or more).
Further preferred PAOs have a kinematic viscosity at 100° C. of at least 3 cSt (preferably at least 6 cSt, preferably at least 8 cSt, most preferably at least 10 cSt); a viscosity index of at least 120 (preferably at least 130, preferably at least 140, most preferably at least 150); a pour point of −10° C. or less (preferably −20° C. or less, preferably −30° C. or less, most preferably −40° C. or less); and a specific gravity (15.6/15.6° C.) of 0.86 or less (preferably 0.855 or less, preferably 0.85 or less, most preferably 0.84 or less).
The PAO may be comprised of one or more distinct PAO components. In one embodiment, the NFP is a blend of one or more PAOs with different compositions (e.g., different α-olefin(s) were used to make the oligomers) and/or different physical properties (e.g., kinematic viscosity, pour point, viscosity index, and/or glass transition temperature).
Desirable PAOs are available as SpectraSyn™ and SpectraSyn Ultra™ from ExxonMobil Chemical in Houston, Tex. (previously sold under the SHF and SuperSyn™ tradenames by ExxonMobil Chemical Company), some of which are summarized in the table below. Other useful PAOs include Synfluid™ available from ChevronPhillips Chemical Company (Pasedena, Tex.), Durasyn™ available from Innovene (Chicago, Ill.), Nexbase™ available from Neste Oil (Keilaniemi, Finland), and Synton™ available from Chemtura Corporation (Middlebury, Conn.). The percentage of carbons in chain-type paraffinic structures (CP) is close to 100% (typically greater than 98% or even 99%) for PAOs.
SpectraSyn™ Series Polyalphaolefins
This invention also relates to hetero-phase polyolefin compositions comprising one or more polyolefins, preferably polypropylene, and one or more non-functionalized plasticizers where the non-functionalized plasticizer comprises a polyalphaolefin comprising oligomers of C5 to C18 olefins (preferably C6 to C14, preferably C8 to C12, preferably C10); having a kinematic viscosity at 100° C. of 5 cSt or more (preferably 8 cSt or more, preferably 10 cSt or more); a viscosity index of 120 or more (preferably 130 or more); and a pour point of −10° C. or less (preferably −20° C. or less, preferably −30° C. or less).
This invention also relates to polyolefin compositions comprising a polypropylene-based TPO and one or more non-functionalized plasticizers where the non-functionalized plasticizer comprises oligomers of linear olefins having 5 to 18 carbon atoms (preferably 6 to 14 carbon atoms, preferably 8 to 12 carbon atoms, preferably 10 carbon atoms); a kinematic viscosity at 100° C. of 5 to 300 cSt (preferably 8 to 150 cSt, preferably 10 to 100 cSt); a viscosity index of 120 or more (preferably 130 or more, preferably 140 or more); and a pour point of −20° C. or less (preferably −30° C. or less, preferably −40° C. or less).
Polybutenes
In some embodiments of the present invention, the NFP comprises oligomers of C4 olefins (including 1-butene, 2-butene, isobutylene, and butadiene, and mixtures thereof) and up to 10 wt % other olefins, often referred to as a “polybutenes” liquid when the oligomers comprise primarily isobutylene and 1-butene. As used herein, the term “polybutenes” also includes homopolymer oligomers of isobutylene or 1-butene, copolymer oligomers of a C4 raffinate stream, and copolymer oligomers of C4 olefins with ethylene and/or propylene and/or C5 olefins. Such liquids are commonly used as additives for polyolefins; e.g. to introduce tack or as a processing aid. The ratio of C4 olefin isomers can vary by manufacturer and by grade, and the material may or may not be hydrogenated after synthesis. Polybutenes are described in, for example, S
Preferred polybutenes include those in which isobutylene derived units comprise 40 to 100 wt % (preferably 40 to 99 wt %, preferably 40 to 96 wt %) of the polymer; and/or the 1-butene derived units comprise 0 to 40 wt % (preferably 2 to 40 wt %) of the copolymer; and/or the 2-butene derived units comprise 0 to 40 wt % (preferably 0 to 30 wt %, preferably 2 to 20 wt %) of the polymer.
Suitable polybutenes may have a kinematic viscosity at 100° C. of 3 to 50,000 cSt (more commonly 5 to 3000 cSt), a pour point of −60 to 10° C. (more commonly −40 to 0° C.), and a number-average molecular weight of 300 to 10,000 g/mol (more commonly 500 to 2,000 g/mol). Note that, at the same kinematic viscosity or molecular weight, a polybutenes liquid has a higher specific gravity and lower flash point than a PAO liquid.
Desirable polybutenes liquids are commercially available from a variety of sources including Innovene (Indopol™ grades) and Infineum (C-Series grades). When the C4 olefin is exclusively isobutylene, the material is referred to as “polyisobutylene” or PIB. Commercial sources of PIB include Texas Petrochemical (TPC Enhanced PIB grades). When the C4 olefin is exclusively 1-butene, the material is referred to as “poly-n-butene” or PNB.
Properties of some polybutenes liquids made from C4 olefin(s) are summarized in the table below. In general, grades with a flash point of 200° C. or more also have a pour point greater than −10° C. and/or a VI less than 120. The percentage of carbons in chain-type paraffinic structures (CP) is close to 100% (typically greater than 98% or even 99%) for polybutenes.
Commercial Examples of Oligomers of C4 Olefin(s)
In a preferred embodiment of the present invention, the NFP is not an oligomer of C4 olefins (i.e., 1-butene, 2-butene, isobutylene, butadiene, and mixtures thereof), including polybutenes and/or PIB and/or PNB. In another embodiment, the NFP contains less than 90 wt % (preferably less than 80 wt %, preferably less than 70 wt %, preferably less than 60 wt %, preferably less than 50 wt %, preferably less than 40 wt %, preferably less than 30 wt %, preferably less than 20 wt %, preferably less than 10 wt %, preferably less than 5 wt %, preferably less than 2 wt %, preferably less than 1 wt %, preferably 0 wt %) of C4 olefins, in particular 1-butene and isobutylene.
In yet another embodiment, when an NFP is present, oligomers of C4 olefins (i.e., 1-butene, 2-butene, isobutylene, butadiene, and mixtures thereof) may also be present in the composition. In a preferred embodiment, the composition comprises less than 50 wt % (preferably less than 40%, preferably less than 30 wt %, preferably less than 20 wt %, preferably less than 10 wt %, preferably less than 5 wt %, preferably less than 1 wt %, preferably 0 wt %) of oligomers of C4 olefins, including polybutenes and/or PIB and/or PNB.
High Purity Hydrocarbon Fluids
In another embodiment, the NFP is a high purity hydrocarbon fluid of lubricating viscosity comprising a mixture of C20 to C120 paraffins, 50 wt % or more being isoparaffinic hydrocarbons and less than 50 wt % being hydrocarbons that contain naphthenic and/or aromatic structures. Preferably, the mixture of paraffins comprises a wax isomerate lubricant basestock or oil, which includes:
In one embodiment, the mixture of paraffins has two or more of the following properties:
In a preferred embodiment, the mixture of paraffins comprises a GTL basestock or oil. GTL basestocks and oils are fluids of lubricating viscosity that are generally derived from waxy synthesized hydrocarbons, that are themselves derived via one or more synthesis, combination, transformation, and/or rearrangement processes from gaseous carbon-containing compounds and hydrogen-containing compounds as feedstocks, such as: hydrogen, carbon dioxide, carbon monoxide, water, methane, ethane, ethylene, acetylene, propane, propylene, propyne, butane, butylenes, and butynes. Preferably, the feedstock is “syngas” (synthesis gas, essentially CO and H2) derived from a suitable source, such as natural gas and/or coal. GTL basestocks and oils include wax isomerates, comprising, for example, hydroisomerized synthesized waxes, hydroisomerized Fischer-Tropsch (F-T) waxes (including waxy hydrocarbons and possible analogous oxygenates), or mixtures thereof. GTL basestocks and oils may further comprise other hydroisomerized basestocks and base oils. Particularly preferred GTL basestocks or oils are those comprising mostly hydroisomerized F-T waxes and/or other liquid hydrocarbons obtained by a F-T synthesis process.
The synthesis of hydrocarbons, including waxy hydrocarbons, by F-T may involve any suitable process known in the art, including those involving a slurry, a fixed-bed, or a fluidized-bed of catalyst particles in a hydrocarbon liquid. The catalyst may be an amorphous catalyst, for example based on a Group VIII metal such as Fe, Ni, Co, Ru, and Re on a suitable inorganic support material, or a crystalline catalyst, for example a zeolitic catalyst. The process of making a lubricant basestock or oil from a waxy stock is characterized as a hydrodewaxing process. A hydrotreating step, while typically not required for F-T waxes, can be performed prior to hydrodewaxing if desired. Some F-T waxes may benefit from removal of oxygenates while others may benefit from oxygenates treatment prior to hydrodewaxing. The hydrodewaxing process is typically conducted over a catalyst or combination of catalysts at high temperatures and pressures in the presence of hydrogen. The catalyst may be an amorphous catalyst, for example based on Co, Mo, W, etc. on a suitable oxide support material, or a crystalline catalyst, for example a zeolitic catalyst such as ZSM-23 and ZSM-48 and others disclosed in U.S. Pat. No. 4,906,350, often used in conjunction with a Group VIII metal such as Pd or Pt. This process may be followed by a solvent and/or catalytic dewaxing step to lower the pour point of the hydroisomerate. Solvent dewaxing involves the physical fractionation of waxy components from the hydroisomerate. Catalytic dewaxing converts a portion of the hydroisomerate to lower boiling hydrocarbons; it often involves a shape-selective molecular sieve, such as a zeolite or silicoaluminophosphate material, in combination with a catalytic metal component, such as Pt, in a fixed-bed, fluidized-bed, or slurry type process at high temperatures and pressures in the presence of hydrogen.
Useful catalysts, processes, and compositions for GTL basestocks and oils, Fischer-Tropsch hydrocarbon derived basestocks and oils, and wax isomerate hydroisomerized basestocks and oils are described in, for example, U.S. Pat. Nos. 2,817,693; 4,542,122; 5,545,674; 4,568,663; 4,621,072; 4,663,305; 4,897,178; 4,900,407; 4,921,594; 4,923,588; 4,937,399; 4,975,177; 5,059,299; 5,158,671; 5,182,248; 5,200,382; 5,290,426; 5,516,740; 5,580,442; 5,885,438; 5,935,416; 5,935,417; 5,965,475; 5,976,351; 5,977,425; 6,025,305; 6,080,301; 6,090,989; 6,096,940; 6,103,099; 6,165,949; 6,190,532; 6,332,974; 6,375,830; 6,383,366; 6,475,960; 6,620,312; and 6,676,827; European Patents EP 324528, EP 532116, EP 532118, EP 537815, EP 583836, EP 666894, EP 668342, EP 776959; WPO patent applications WO 97/31693, WO 99/20720, WO 99/45085, WO 02/64710, WO 02/64711, WO 02/70627, WO 02/70629, WO 03/33320; and British Patents 1350257; 1390359; 1429494; and 1440230. Particularly favorable processes are described in European Patent Applications EP 464546 and EP 464547. Processes using Fischer-Tropsch wax feeds are described in U.S. Pat. Nos. 4,594,172; 4,943,672; 6,046,940; 6,103,099; 6,332,974; 6,375,830; and 6,475,960.
Desirable GTL-derived fluids are expected to become broadly available from several sources, including Chevron, ConocoPhillips, ExxonMobil, Sasol, SasolChevron, Shell, Statoil, and Syntroleum.
This invention also relates to plasticized polyolefin compositions comprising one or more polyolefins and one or more non-functionalized plasticizers, where one or more NFP is a high purity hydrocarbon fluid derived from a GTL process comprising a mixture of paraffins of carbon number ranging from about C20 to C100, a molar ratio of isoparaffins:n-paraffins greater than about 50:1, the percentage of carbons in paraffinic structures (CP) of 98% or more, a pour point ranging from about −20 to −60° C., and a kinematic viscosity at 100° C. ranging from about 6 to 20 cSt.
As used herein, the following terms have the indicated meanings: “hydroisomerized” describes a catalytic process in which normal paraffins and/or slightly branched isoparaffins are converted by rearrangement into more branched isoparaffins (also known as “isodewaxing”); “wax” is a hydrocarbonaceous material existing as a solid at or near room temperature, with a melting point of 0° C. or above, and consisting predominantly of paraffinic molecules, most of which are normal paraffins; “slack wax” is the wax recovered from petroleum oils such as by solvent dewaxing, and may be further hydrotreated to remove heteroatoms.
Group III Mineral Oils
In another embodiment, the NFP comprises a Group III Mineral Oil. Preferably the NFP has a saturates levels of 90% or more (preferably 92% or more, preferably 94% or more, preferably 95% or more, preferably 98% or more); a sulfur content of less than 0.03% (preferably between 0.001 and 0.01%); and a VI of 120 or more (preferably 130 or more, preferably 140 or more). Preferably the Group III Mineral Oil has a kinematic viscosity at 100° C. of 3 to 50, preferably 4 to 40 cSt, preferably 6 to 30 cSt, preferably 8 to 20; and/or a number average molecular weight of 300 to 5,000 g/mol, preferably 400 to 2,000 g/mol, preferably 500 to 1,000 g/mol. Preferably the Group III Mineral Oil has a pour point of −10° C. or less, a flash point of 200° C. or more, and a specific gravity (15.6° C./15.6° C.) of 0.86 or less.
Preferably, the Group III Mineral Oil is a Group III basestock. Desirable Group III basestocks are commercially available from a number of sources and include those described in the table below. The percentage of carbons in chain-type paraffinic structures (CP) in such liquids is greater than 80%.
Commercially Available Group III Basestocks
1Available from ChevronTexaco (USA).
2Available from Neste Oil (Finland).
3Available from SK Corp (South Korea).
4Available from ConocoPhillips (USA)/S-Oil (South Korea).
5Available from PetroCanada (Canada).
6Available from ExxonMobil (USA).
Exceptional Paraffinic Process Oils
In another embodiment, the NFP is an Exceptional Paraffinic Process Oil, which is a paraffinic process oil with
Examples of commercially available paraffinic process oils are described in the tables below; each has a viscosity index less than 120, so none are Group III Mineral Oils. Furthermore, all have less than 80% carbons in paraffinic chain-like structures (CP<80%), meaning they also all have more than 20% carbons in aromatic and/or naphthenic ring-like structures (CA+CN). Conventional Paraffinic Process Oils, as shown in the first table, are low viscosity and/or have relatively high pour points. The Exceptional Paraffinic Process Oils in the second table are examples from a very select subcategory of paraffinic process oils that have a kinematic viscosity at 40° C. of 80 cSt or more (indicating the potential for high permanence) and a pour point of −15° C. or less (indicating the potential for high plasticization efficiency).
Commercial Examples of Conventional Paraffinic Process Oils
1Available from Penreco (USA).
2Available from Chevron (USA).
3Available from Sunoco (USA).
4Available from ExxonMobil (USA).
5Available from Royal Dutch Shell (UK/Netherlands).
6Available from Idemitsu (Japan).
Commercial Examples of Exceptional Paraffinic Process Oils
1Available from Chevron (USA).
2Available from Idemitsu (Japan).
Preferably, the NFP is not a naphthenic mineral oil (also called a naphthenic process oil or a naphthenic extender oil), nor is it an aromatic mineral oil (also called an aromatic process oil or an aromatic extender oil). More preferably, naphthenic and aromatic mineral oils are substantially absent from the compositions of the present invention. In certain embodiments, paraffinic mineral oils with a kinematic viscosity at 40° C. of less than 80 cSt and a pour point of greater than −15° C. are substantially absent from the compositions of the present invention.
General Characteristics of Useful NFPs
In preferred embodiments, the NFP has a kinematic viscosity at 100° C. (KV100) of 3 cSt or more, preferably 4 cSt or more, preferably 5 cSt or more, preferably 6 cSt or more, preferably 8 cSt or more, preferably 10 cSt or more, preferably 20 cSt or more, preferably 40 cSt or more, preferably 6 to 5000 cSt, preferably 8 to 3000 cSt, preferably 10 to 1000 cSt, preferably 12 to 500 cSt, preferably 15 to 400 cSt, preferably 20 to 350 cSt, preferably 35 to 300 cSt, preferably 40 to 200 cSt, preferably 8 to 300 cSt, preferably 6 to 150 cSt, preferably 10 to 100 cSt, preferably less than 50 cSt, wherein a desirable range may be any combination of any lower KV100 limit with any upper KV100 limit described herein.
In preferred embodiments, the NFP has a pour point of −10° C. or less, preferably −20° C. or less, preferably −30° C. or less, preferably −40° C. or less, preferably −45° C. or less, preferably −50° C. or less, preferably −10 to −100° C., preferably −15 to −80° C., preferably −15 to −75° C., preferably −20 to −70° C., preferably −25 to −65° C., preferably greater than −120° C., wherein a desirable range may be any combination of any lower pour point limit with any upper pour point limit described herein. In another embodiment, the NFP has a pour point of less than −30° C. when the kinematic viscosity at 40° C. is from 20 to 600 cSt (preferably 30 to 400 cSt, preferably 40 to 300 cSt). Most mineral oils, which typically include aromatic moieties and other functional groups, have a pour point of from 10 to −20° C. in the same kinematic viscosity range.
In a preferred embodiment, the NFP has a glass transition temperature (Tg) of −40° C. or less, preferably −50° C. or less, preferably −60° C. or less, preferably −70° C. or less, preferably −80° C. or less, preferably −45 to −120° C., preferably −65 to −90° C., wherein a desirable range may be any combination of any lower Tg limit with any upper Tg limit described herein.
In preferred embodiments, the NFP has a Viscosity Index (VI) of 100 or more, preferably 110 or more, preferably 120 or more, preferably 130 or more, preferably 115 to 350, preferably 135 to 300, preferably 140 to 250, preferably 150 to 200, preferably 125 to 180, wherein a desirable range may be any combination of any lower VI limit with any upper VI limit described herein.
In preferred embodiments, the NFP has a flash point of 200° C. or greater, preferably 210° or greater, preferably 230° C. or greater, preferably 200 to 350° C., preferably 210 to 300° C., preferably 215 to 290° C., preferably 220 to 280° C., preferably 240 to 280° C., wherein a desirable range may be any combination of any lower flash point limit with any upper flash point limit described herein.
In preferred embodiments, the NFP has a specific gravity of 0.86 or less, preferably 0.855 or less, preferably 0.84 or less, preferably 0.78 to 0.86, preferably 0.79 to 0.855, preferably 0.80 to 0.85, preferably 0.81 to 0.845, preferably 0.82 to 0.84, wherein a desirable range may be any combination of any lower specific gravity limit with any upper specific gravity limit described herein.
In preferred embodiments, the NFP has a number-average molecular weight (Mn) of 250 g/mol or more, preferably 300 g/mol or more, preferably 500 g/mol or more, preferably 300 to 21,000 g/mol, preferably 300 to 10,000 g/mol, preferably 400 to 5,000 g/mol, preferably 500 to 3,000 g/mol, preferably 10 kg/mol or less, preferably 5 kg/mol or less, preferably 3 kg/mol or less, preferably 2 kg/mol or less, preferably 1 kg/mol or less, wherein a desirable range may be any combination of any lower Mn limit with any upper Mn limit described herein.
In preferred embodiments, the NFP has a low degree of color, such as typically identified as “water white”, “prime white”, “standard white”, or “bright and clear,” preferably an APHA color of 100 or less (preferably 80 or less, preferably 60 or less, preferably 40 or less, preferably 20 or less).
In other embodiments, any NFP may have an initial boiling point of from 300 to 600° C. (preferably 350 to 500° C., preferably greater than 400° C.).
Any of the NFPs for use in the present invention may be described by any embodiment described herein, or any combination of the embodiments described herein. For example, in one embodiment, the NFP is a C6 to C200 paraffin having a pour point of less than −25° C. Alternately, the NFP comprises an aliphatic hydrocarbon having a kinematic viscosity of from 0.1 to 1000 cSt at 100° C. Alternately, the NFP is selected from isoparaffins and PAOs and blends thereof having from 8 to 25 carbon atoms.
In another embodiment, the NFP of the present invention comprises C25 to C1500 paraffins, and C30 to C500 paraffins in another embodiment, and has a flash point of 200° C. or more and a pour point of −10° C. or less and a viscosity index of 120 or more. Alternately the NFP comprises C25 to C1500 paraffins, preferably C30 to C500 paraffins, and has a flash point of 200° C. or more and a pour point of −20° C. or less. Alternately the NFP comprises C25 to C1500 paraffins, preferably C30 to C500 paraffins, and has a flash point of 200° C. or more and a kinematic viscosity at 100° C. of 35 cSt or more. In another embodiment, the NFP consists essentially of C35 to C300 paraffins, preferably the NFP consists essentially of C40 to C250 paraffins, and has a flash point of 200° C. or more and a pour point of −10° C. or less and a viscosity index of 120 or more. Alternately the NFP consists essentially of C35 to C300 paraffins, preferably C40 to C250 paraffins, and has a flash point of 200° C. or more and a pour point of −20° C. or less. Alternately the NFP consists essentially of C35 to C300 paraffins, preferably C40 to C250 paraffins, and has a flash point of 200° C. or more and a kinematic viscosity at 100° C. of 35 cSt or more. Alternately the NFP has a flash point of 200° C. or more and a pour point of −20° C. or less. Alternately the NFP has a flash point of 200° C. or more and a kinematic viscosity at 100° C. of 35 cSt or more.
In a preferred embodiment, any NFP described herein has a flash point of 200° C. or more (preferably 210° C. or more) and a pour point of −20° C. or less (preferably −25° C. or less, preferably −30° C. or less, preferably −35° C. or less, preferably −45° C. or less, preferably −50° C. or less).
In another preferred embodiment, the NFP has a flash point of 220° C. or more (preferably 230° C. or more) and a pour point of −10° C. or less (preferably −25° C. or less, preferably −30° C. or less, preferably −35° C. or less, preferably −45° C. or less, preferably −50° C. or less).
In another preferred embodiment, the NFP has a kinematic viscosity at 100° C. of 35 cSt or more (preferably 40 cSt or more, preferably 50 cSt or more, preferably 60 cSt or more) and a specific gravity (15.6/15.6° C.) of 0.87 or less (preferably 0.865 or less, preferably 0.86 or less, preferably 0.855 or less) and a flash point of 200° C. or more (preferably 230° C. or more).
In another preferred embodiment, the NFP has a) a flash point of 200° C. or more; b) a specific gravity of 0.86 or less; and c1) a pour point of −10° C. or less and a viscosity index of 120 or more, or c2) a pour point of −20° C. or less, or c3) a kinematic viscosity at 100° C. of 35 cSt or more.
In another preferred embodiment, the NFP has a) a specific gravity (15.6/15.6° C.) of 0.85 or less (preferably between 0.80 and 0.85); and b1) a kinematic viscosity at 100° C. of 3 cSt or more (preferably 4 or more, preferably 5 cSt or more, preferably 8 cSt or more, preferably 10 cSt or more, preferably 15 cSt or more, preferably 20 cSt or more) and/or b2) a number-average molecular weight (Mn) of at least 280 g/mol.
In another preferred embodiment, the NFP has a) a specific gravity (15.6/15.6° C.) of 0.86 or less (preferably between 0.81 and 0.855, preferably between 0.82 and 0.85); and b1) a kinematic viscosity at 100° C. of 5 cSt or more (preferably 6 or more, preferably 8 cSt or more, preferably 10 cSt or more, preferably 12 cSt or more, preferably 15 cSt or more, preferably 20 cSt or more) and/or b2) a number-average molecular weight (Mn) of at least 420 g/mol (preferably at least 450 g/mol, preferably at least 480 g/mol, preferably at least 500 g/mol).
In another preferred embodiment, the NFP has a) a specific gravity (15.6/15.6° C.) of 0.87 or less (preferably between 0.82 and 0.87); and b1) a kinematic viscosity at 100° C. of 10 cSt or more (preferably 12 cSt or more, preferably 15 cSt or more, preferably 20 cSt or more, preferably 30 cSt or more, preferably 40 cSt or more) and/or b2) a number-average molecular weight (Mn) of at least 700 g/mol (preferably at least 800 g/mol, preferably at least 900 g/mol, preferably at least 1000 g/mol).
In another preferred embodiment, the NFP has a) a specific gravity (15.6/15.6° C.) of 0.88 or less (preferably 0.87 or less, preferably between 0.82 and 0.87); and b1) a kinematic viscosity at 100° C. of 15 cSt or more (preferably 20 cSt or more, preferably 25 cSt or more, preferably 30 cSt or more, preferably 40 cSt or more) and/or b2) a number-average molecular weight (Mn) of at least 840 g/mol (preferably at least 900 g/mol).
In another preferred embodiment the NFP has a kinematic viscosity at 100° C. of 3 to 3000 cSt (preferably 6 to 300 cSt, preferably 8 to 100 cSt); and a number average molecular weight (Mn) of 300 to 21,000 g/mol (preferably 500 to 5,000 g/mol, preferably 600 to 3,000 g/mol).
In another preferred embodiment the NFP has a kinematic viscosity at 100° C. of 3 to 500 cSt (preferably 6 to 200 cSt, preferably 8 to 100 cSt, preferably 8 to 25 cSt); and a number average molecular weight (Mn) of 300 to 10,000 g/mol (preferably 400 to 5,000 g/mol, preferably 500 to 2,500 g/mol, preferably 300 to 1,200 g/mol).
In another preferred embodiment the NFP has a kinematic viscosity at 100° C. of 3 to 100 cSt (preferably 4 to 50 cSt, preferably 6 to 25 cSt, preferably 6 to 15 cSt); and a number average molecular weight (Mn) of 300 to 3,000 g/mol (preferably 350 to 2,000 g/mol, preferably 400 to 1,000 g/mol, preferably 300 to 800 g/mol).
In another preferred embodiment, the NFP has a pour point of −25° C. or less (preferably between −30° C. and −90° C.), and a kinematic viscosity in the range of from 20 to 5000 cSt at 40° C. In another preferred embodiment, the NFP has a pour point of −25° C. or less and a Mn of 400 g/mol or greater. Most mineral oils, which typically include functional groups, have a pour point of from 10° C. to −25° C. at the same viscosity and molecular weight ranges.
In another preferred embodiment the NFP has kinematic viscosity at 100° C. of 3 cSt or greater (preferably 6 cSt or greater, preferably 8 cSt or greater) and one or more of the following properties:
In another preferred embodiment, the NFP has a Viscosity Index of 120 or more and one or more of the following properties:
In another preferred embodiment, the NFP has a pour point of −20° C. or less, preferably −30° C. or less, and one or more of the following properties:
In another preferred embodiment the NFP has a glass transition temperature (Tg) that cannot be determined by ASTM E 1356 or, if it can be determined, then the Tg according to ASTM E 1356 is less than −20° C. (preferably less than −30° C., preferably less than −40° C.), and has one or more of the following properties:
In certain particularly preferred embodiments, the NFP has a specific gravity of 0.86 or less (preferably 0.855 or less, preferably 0.85 or less), and one or more of the following:
In certain particularly preferred embodiments, the NFP has a pour point of −10° C. or less (preferably −15° C. or less, preferably −20° C. or less, preferably −25° C. or less), a VI of 120 or more (preferably 135 or more, preferably 140 or more), and optionally a flash point of 200° C. or more (preferably 220° C. or more, preferably 240° C. or more).
In certain particularly preferred embodiments, the NFP has a pour point of −20° C. or less (preferably −25° C. or less, preferably −30° C. or less, preferably −40° C. or less) and one or more of the following:
In certain particularly preferred embodiments, the NFP has a KV100 of 4 cSt or more (preferably 5 cSt or more, preferably 6 cSt or more, preferably 8 cSt or more, preferably 10 cSt or more), a specific gravity of 0.86 or less (preferably 0.855 or less, preferably 0.85 cSt or less), and a flash point of 200° C. or more (preferably 220° C. or more, preferably 240° C. or more).
In a preferred embodiment, the NFP has a flash point of 200° C. or more (preferably 220° C. or more, preferably 240° C. or more), a pour point of −10° C. or less (preferably −15° C. or less, preferably −20° C. or less, preferably −25° C. or less), a specific gravity of 0.86 or less (preferably 0.855 or less, preferably 0.85 or less), a KV100 of 4 cSt or more (preferably 5 cSt or more, preferably 6 cSt or more, preferably 8 cSt or more, preferably 10 cSt or more), and optionally a VI of 100 or more (preferably 120 or more, preferably 135 or more).
In a preferred embodiment, the NFP has a KV100 of 35 cSt or more (preferably 40 or more) and a specific gravity of 0.86 or less (preferably 0.855 or less), and optionally one or more of the following:
In a preferred embodiment, the NFP has a flash point of 200° C. or more (preferably 210° C. or more, preferably 220° C. or more), a pour point of −10° C. or less (preferably −20° C. or less, preferably −30° C. or less), and a KV100 of 6 cSt or more (preferably 8 cSt or more, preferably 10 cSt or more, preferably 15 cSt or more).
In a preferred embodiment, the NFP has a pour point of −40° C. or less (preferably −50° C. or less) and a specific gravity of 0.84 or less (preferably 0.83 or less).
In a preferred embodiment, the percentage of carbons in chain-type paraffins (CP) for any NFP is at least 80% (preferably at least 85%, preferably at least 90%, even preferably at least 95%, even preferably at least 98%, most preferably at least 99%).
Preferred NFPs of this invention are characterized in that, when blended with the polyolefin(s) to form a plasticized composition, the NFP is miscible with the polyolefin(s) as indicated by no change in the number of tan-delta peaks in the Dynamic Mechanical Analysis trace (DMA Tan-Delta vs temperature) as compared to the same composition without the NFP added. Lack of miscibility is indicated by an increase in the number of tan-delta peaks in DMA trace over those in the composition absent the NFP.
Fillers
The hetero-phase polyolefin compositions of the present invention include at least one filler. The classes of materials described herein that are useful as fillers can be utilized alone or admixed to obtain desired properties. In any of the embodiments, filler may be present at 0.1 to 50 wt % (preferably 1 to 40 wt %, preferably 2 to 30 wt %, preferably 5 to 20 wt %) based on the weight of the total composition. Filler content is equated with the wt % ash content as determined by the ISO 3451-1 (A) test method.
Desirable fillers include but not limited to: mineral aggregates (natural or synthetic), fibers, carbon black, graphite, wollastonite, natural and synthetic clays including nanoclays and organoclays, sand, glass beads, and the like, and any other porous or nonporous fillers and supports known in the art.
In preferred embodiments the filler has a median particle diameter of 0.1-100 microns (preferably 0.5-50 microns, preferably 1 to 20 microns). In other preferred embodiments the filler has a filler shape that is needle-like or plate-like, with an aspect ratio greater than 1.2 (preferably greater than 2, preferably greater than 3, preferably greater than 5, preferably greater than 10, preferably from 2 to 20, preferably from 3-10), where the aspect ratio is the ratio of the longest dimension to the shortest dimension of the particles, on average, and is typically reported by filler manufacturers. In other embodiments the filler has an aspect ratio of essentially 1 (0.9 to 1.1); i.e., it is not needle-like or plate-like but is essentially spherical. In another embodiment, the filler is pulverized. Useful fillers have a specific surface area of 10 to 300 m2/cm3.
In one embodiment of the present invention, the NFP or some portion of the NFP is blended with a filler, desirably a porous filler. The NFP and filler may be blended by, for example, a tumbler or other wet blending apparatus, for a time suitable to form a homogenous composition of NFP and filler, desirably from 1 minute to 5 hours. In another embodiment, a filler may be pre-contacted or pre-absorbed with the NFP or some portion of the NFP prior to contacting the filler with the polyolefin. In another embodiment, the filler, polyolefin, and NFP are contacted simultaneously (or in the same blending apparatus).
Mineral Aggregates
Preferred natural or synthetic mineral fillers include talc, mica, wollastonite, titanium dioxide, silicon carbide, silica, silicon dioxide and other oxides of silica (precipitated or not), calcium silicate, calcium and barium sulfates, calcium carbonate (calcite), lead carbonate, magnesium silicate, magnesium oxysulfates, antimony oxide, zinc white, lithopone, zircon, corundum, spinel, apatite, Barytes powder, magnesiter, dolomite, zinc borate, hydrotalcite compounds of the ions Mg, Ca, or Zn with Al, Cr or Fe and CO3 and/or HPO4 (hydrated or not), quartz powder, hydrochloric magnesium carbonate, alumina, chrome, phosphorous and brominated flame retardants, antimony trioxide, silicone, other metal oxides, other metal carbonates, other metal hydroxides, and blends thereof.
Fibers
Preferred fibers include glass fibers (long or short), carbon fibers, and natural and synthetic polymer fibers including polyethylene terephthalate (PET) fibers and rayon fibers.
Clays
Preferred clays include nanoclays or organoclays to produce a nanocomposite. These clays may comprise one or more of ammonium, primary alkylammonium, secondary alkylammonium, tertiary alkylammonium, quaternary alkylammonium, phosphonium derivatives of aliphatic, aromatic or arylaliphatic amines, phosphines or sulfides or sulfonium derivatives of aliphatic, aromatic or arylaliphatic amines, phosphines or sulfides. The organoclay may be selected from one or more of montmorillonite, sodium montmorillonite, calcium montmorillonite, magnesium montmorillonite, nontronite, beidellite, volkonskoite, laponite, hectorite, saponite, sauconite, magadite, kenyaite, sobockite, svindordite, stevensite, vermiculite, halloysite, aluminate oxides, hydrotalcite, illite, rectorite, tarosovite, ledikite, and/or florine mica. In another embodiment the filler is a nano-clay with mean particle diameter of less than 1 micron.
Additives
Additives such as antioxidants and stabilizers (including UV stabilizers and other UV absorbers, such as chain-breaking antioxidants), nucleating agents, slip agents, block, antiblock, pigments, dyes, color masterbatches, waxes, processing aids (including pine or coal tars or resins and asphalts), neutralizers (such as hydro talcite), adjuvants, oils, lubricants, low molecular weight resins, surfactants, acid scavengers, anticorrosion agents, cavitating agents, blowing agents, quenchers, antistatic agents, cure or cross linking agents or systems (such as elemental sulfur, organo-sulfur compounds, and organic peroxides), fire retardants, coupling agents (such as silane), and combinations thereof may also be present in the polyolefin compositions described herein. Typical additives used in polypropylene and polypropylene blends are described in P
Antioxidants and Stabilizers
Particularly useful antioxidants and stabilizers such as organic phosphites, hindered amines (including high and low molecular weight hindered amine light stabilizers, or “HALS”), and phenolic antioxidants may be present in the thermoplastic polyolefin compositions of the invention from 0.001 to 2 wt % (preferably from 0.01 to 0.8 wt %, preferably from 0.02 to 0.5 wt %). Non-limiting examples of organic phosphites that are suitable are tris(2,4-di-tert-butylphenyl)phosphite (IRGAFOS 168) and di(2,4-di-tert-butylphenyl)pentaerithritol diphosphite (ULTRANOX 626). Non-limiting examples of hindered amines include poly[2-N,N′-di(2,2,6,6-tetramethyl-4-piperidinyl)-hexanediamine-4-(1-amino-1,1,3,3-tetramethylbutane)sym-triazine] (CHIMASORB 944); bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate (TINUVIN 770). Non-limiting examples of phenolic antioxidants include pentaerythrityl tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (IRGANOX 1010); and 1,3,5-Tri(3,5-di-tert-butyl-4-hydroxybenzyl-isocyanurate (IRGANOX 3114). Preferred antioxidants include phenolic antioxidants, such as Irganox 1010, Irganox, 1076 both available from Ciba-Geigy.
In another embodiment, the polymer concentrate may comprise one or more phenolic antioxidants. Preferred examples of phenolic antioxidants include substituted phenols such as 2,6-di-t-butylphenol in which a hydrogen atom at 2 and/or 6 position is substituted by an alkyl residue. Typical examples of the phenolic antioxidant include 2,6-di-t-butyl-p-cresol, 2,4,6-tri-t-butylphenol, vitamin E, 2-t-butyl-6-(3′-t-butyl-5′-methyl-2′-hydroxybenzyl)-4-methylphenyl acrylate, 2,2′-methylene-bis(4-methyl-6-t-butylphenyl), 2,2′-methylene-bis(4-ethyl-6-t-butyl-phenol), 2,2′-methylene-bis(6-cyclohexyl-4-methylphenol), 1,6-hexanediol-bis([3-(3,5-di-t-butyl[4-hydroxyphenyl])] propionate, and pentaerythrityl-tetrakis-[3-(3,5-di-t-butyl-4-hydroxyphenyl)] propionate.
Slip Agent
The polyolefin compositions of the present invention may include a slip agent. Preferably, the slip agent is preferably a fast bloom slip agent, and can be a hydrocarbon having one or more functional groups selected from hydroxide, aryls and substituted aryls, halogens, alkoxys, carboxylates, esters, carbon unsaturation, acrylates, oxygen, nitrogen, carboxyl, sulfate and phosphate. In one embodiment the slip agent is an ionic compound. Ionic slip agents include salt derivatives of aromatic or aliphatic hydrocarbon oils, notably metal salts of fatty acids, including metal salts of carboxylic, sulfuric, and phosphoric aliphatic saturated or unsaturated acid having a chain length of 7 to 26 carbon atoms, preferably 10 to 22 carbon atoms. Suitable fatty acids include the monocarboxylic acids lauric acid, stearic acid, succinic acid, stearyl lactic acid, lactic acid, phthalic acid, benzoic acid, hydroxystearic acid, ricinoleic acid, naphthenic acid, oleic acid, palmitic acid, erucic acid, and the like, and the corresponding sulfuric and phosphoric acids. Suitable metals include Li, Na, Mg, Ca, Sr, Ba, Zn, Cd, Al, Sn, Pb and so forth. Suitable salts include magnesium stearate, calcium stearate, sodium stearate, zinc stearate, calcium oleate, zinc oleate, magnesium oleate, and so on, as well as the corresponding metal higher alkyl sulfates and metal esters of higher alkyl phosphoric acids.
In another embodiment, fatty acid metal salts are substantially absent from the polyolefin compositions of the present invention.
In one embodiment the slip agent is a non-ionic functionalized compound. Suitable functionalized compounds include: (a) esters, amides, alcohols and acids of oils including aromatic or aliphatic hydrocarbon oils, for example, mineral oils, naphthenic oils, paraffinic oils; natural oils such as castor, corn, cottonseed, olive, rapeseed, soybean, sunflower, other vegetable and animal oils, and so on. Representative functionalized derivatives of these oils include, for example, polyol esters of monocarboxylic acids such as glycerol monostearate, pentaerythritol monooleate, and the like, saturated and unsaturated fatty acid amides or ethylenebis(amides), such as oleamide, erucamide, linoleamide, and mixtures thereof, glycols, polyether polyols like Carbowax, and adipic acid, sebacic acid, and the like; (b) waxes, such as carnauba wax, microcrystalline wax, polyolefin waxes, e.g. polyethylene waxes; (c) fluoro-containing polymers such as polytetrafluoroethylene, fluorine oils, fluorine waxes and so forth; and (d) silicon compounds such as silanes and silicone polymers, including silicone oils, polydimethylsiloxane, amino-modified polydimethylsiloxane, and so on.
The fatty amides useful in the present invention are represented by the formula: R1C(O)NHR2 where R1 is a saturated or unsaturated alkyl group having of from 7 to 26 carbon atoms, preferably 10 to 22 carbon atoms, and R2 is independently hydrogen or a saturated or unsaturated alkyl group having from 7 to 26 carbon atoms, preferably 10 to 22 carbon atoms. Compounds according to this structure include for example, palmitamide, stearamide, arachidamide, behenamide, oleamide, erucamide, linoleamide, stearyl stearamide, palmityl palmitamide, stearyl arachidamide and mixtures thereof.
The ethylenebis(amides) useful in the present invention are represented by the formula: RC(O)NHCH2CH2NHC(O)R where each R is independently is a saturated or unsaturated alkyl group having of from 7 to 26 carbon atoms, preferably 10 to 22 carbon atoms. Compounds according to this structure include for example, stearamidoethylstearamide, stearamidoethylpalmitamide, palmitamido-ethylstearamide, ethylenebisstearamide, ethylenebisoleamide, stearylerucamide, erucamidoethylerucamide, oleamidoethyloleamide, erucamidoethyloleamide, oleamidoethylerucamide, stearamidoethylerucamide, erucamidoethylpalmitamide, palmitamidoethyloleamide and mixtures thereof.
Commercially available examples of fatty amides include Ampacet 10061 which comprises 5% of a 50:50 mixture of the primary amides of erucic and stearic acids in polyethylene; Elvax 3170 which comprises a similar blend of the amides of erucic and stearic acids in a blend of 18% vinyl acetate resin and 82% polyethylene. These slip agents are available from DuPont. Slip agents also are available from Croda Universal, including Crodamide OR (an oleamide), Crodamide SR (a stearamide), Crodamide ER (an erucamide), and Crodamide BR (a behenamide); and from Crompton, including Kemamide S (a stearamide), Kemamide B (a behenamide), Kemamide 0 (an oleamide), Kemamide E (an erucamide), and Kemamide (an N,N′-ethylenebisstearamide). Other commercially available slip agents include Erucamid ER erucamide.
Generally preferred concentrations of the slip agent are in the range of from about 0.001% to about 0.5% by weight of the composition, preferably of from about 0.01% to about 0.4% by weight and most preferably of from about 0.1 parts to about 0.3% by weight based on the weight of the composition.
Nucleating Agent
The polyolefin composition described herein may also include the addition of at least one nucleating agent. Typically, nucleating agents increase the rate of crystallization (isothermal and/or non-isothermal) of the polyolefin. A special class of nucleating agents known as clarifying agents typically reduces the size of crystallites, thereby improving the transparency and clarity of articles made from the polyolefin.
Suitable nucleating agents for use herein are disclosed in Plastics Additive Handbook, 5th Ed.; H. Zweifel, Ed.; Hanser-Gardner Publications, (2001); Chapter 18, p. 949-972. Suitable nucleating agents for use herein are also disclosed by H. N. Beck in Heterogeneous Nucleating Agents for Polypropylene Crystallization, J. A
Suitable nucleating agents preferably improve one or more performance parameters of the polyolefin, such as increased clarity, reduced haze, increased stiffness, increased impact toughness, increased heat deflection temperature; and/or processing parameters, such as reduced cycle time or increased line speed. Suitable nucleating agents can be organic, inorganic, or polymeric, and may include combinations of one or more nucleating agent.
The following list is intended to be illustrative of suitable choices of nucleating agents for inclusion in the instant formulations. Suitable nucleating agents include fillers such as silica, kaolin, carbon black, and talc; metal salts including sodium salts, lithium salts, potassium salts, phosphonic acid salts, carboxylate salts, and aromatic carboxylic-acid salts (including norbornene carboxylic-acid salts); metal phosphates (including sodium phosphates), phosphate esters, and phosphate ester salts; metal salts of suberic acid (including the calcium salt); metal salts of hexahydrophthalic acid; salts of disproportionated rosin esters; sorbitol derivatives, including dibenzylidene sorbitol and derivatives, sorbitol acetal and derivatives, and sorbitol di-acetal and derivatives; quinacridone dyes; carboxamide derivatives, including naphthalene carboxamide derivatives; benzenetrisamide derivatives, including 1,3,5-benzenetrisamides described in Blomenhofer, et al, Macromolecules 38, 3688-3695 (2005); trimesic acid derivatives; and polymeric nucleating agents such as poly(3-methyl-1-butene), poly(dimethylstyrene), poly(ethylene terephthalate), polyamides (nylons), and polycarbonates.
Specific examples of suitable nucleating agents are sodium benzoate and sodium naphthenoate, sodium 2,2′-methylenebis(4,6-di-tert-butylphenyl) phosphate, aluminum 2,2′-methylenebis(4,6-di-tert-butylphenyl) phosphate, di(p-tolylidene) sorbitol, dibenzylidene sorbitol, di(p-methylbenzylidene) sorbitol, di(p-ethylbenzylidene) sorbitol, bis(3,4-dimethylbenzylidene) sorbitol, and N′,N′-dicyclohexyl-2,6-naphthalenedicarboxamide. Other suitable nucleating agents are disclosed in U.S. Pat. Nos. 4,016,118; 4,371,645; 5,049,605; 6,235,823; US 2004/0132884; WO 02/046300; WO 03/102069; EP 776933.
Additional specific examples of suitable nucleating agents include: those available from Milliken Chemical under the “Millad” and “Hyperform” tradenames, including
Particularly preferred nucleating agents include dibenzylidene sorbitol derivatives, phosphate ester derivatives, and benzenetrisamide derivatives. Particularly preferred nucleating agents include 1,3:2,4-bis(3,4-dimethylbenzylidene)sorbitol (available as Millad 3988 from Milliken Chemical; Spartanburg, S.C.), 2.2.1-heptane-bicyclodicarboxylic acid (available as HPN-68 from Milliken Chemical; Spartanburg, S.C.), 1,3:2,4-bis-(p-methylbenzylidene)sorbitol (available as Irgaclear DM from Ciba Specialty Chemicals; Basel, Switzerland), 2,2′-methylenebis(4,6-di-tertbutylphenol) phosphate salt (available as NA-11 from Amfine Chemical; Upper Saddle River, N.J.), and sodium benzoate (available from Ciba Specialty Chemicals; Basel, Switzerland).
The appearance and mechanical properties of the compositions of the present invention can be controlled to some extent by the type of nucleating agent used. The nucleating agent(s) are typically present in the composition of this invention at 0.01 to 1 wt % (100 to 10,000 ppm), preferably 0.02 to 0.5 wt % (200 to 5,000 ppm), preferably 0.03 to 0.3 wt % (300 to 3,000 ppm), preferably 0.05 to 0.25 wt % (500 to 2,500 ppm), based upon the weight of the composition (where ppm is parts-per-million by weight).
Crosslinking Agents
In another embodiment, the polyolefin composition may further comprise a crosslinking agent. Preferred crosslinking agents include those having functional groups that can react with functional groups present on the polyolefin, including alcohols, multiols, amines, diamines and/or triamines. Particular examples of crosslinking agents useful in this invention include polyamines such as ethylene-diamine, diethylene-triamine, hexamethylene-diamine, diethylaniinopropyl-amine, and menthane-diamine.
Oils
In some embodiments, conventional mineral oils may be present in the composition of this invention, such as paraffinic or naphthenic mineral oils, white oils, technical white oils, bright stocks, Group I or Group II basestocks, vegetable oils, or the like. In other embodiments, functionalized oils other than amide slip agents are substantially absent from the polyolefin composition.
In preferred embodiments, naphthenic and aromatic mineral oils are substantially absent from the compositions of the present invention, preferably present at 0 wt %. In another embodiment, aromatic moieties and carbon-carbon unsaturation are substantially absent from the non-functionalized plasticizers used in the present invention. Aromatic moieties include a compound whose molecules have the ring structure characteristic of benzene, naphthalene, phenanthrene, anthracene, etc.
Tackifiers
In another embodiment, tackifiers may be blended with the polyolefin composition of this invention. Examples of useful tackifiers include, but are not limited to, aliphatic hydrocarbon resins, aromatic modified aliphatic hydrocarbon resins, hydrogenated polycyclopentadiene resins, polycyclopentadiene resins, gum rosins, gum rosin esters, wood rosins, wood rosin esters, tall oil rosins, tall oil rosin esters, polyterpenes, aromatic modified polyterpenes, terpene phenolics, aromatic modified hydrogenated polycyclopentadiene resins, hydrogenated aliphatic resin, hydrogenated aliphatic aromatic resins, hydrogenated terpenes and modified terpenes, and hydrogenated rosin esters. In some embodiments the tackifier is hydrogenated. In other embodiments the tackifier is non-polar. (Non-polar meaning that the polar groups are substantially absent from the tackifier, or preferably polar groups are not present.) In some embodiments the tackifier has a softening point (Ring and Ball, ASTM E 28) of 80 to 140° C., preferably 100 to 130° C.
Tackifiers, if present, are typically present at about 1 to about 50 wt % (preferably 2 to 40 wt %, preferably 5 to 20 wt %), based upon the weight of the composition. Preferably however, tackifier is not present, or is present at less than 10 wt % (preferably less than 5 wt %, preferably at less than 1 wt %).
Conventional Plasticizers
In one embodiment of compositions of the present invention, conventional plasticizers such as are commonly used for poly(vinyl chloride) are substantially absent, preferably present at 0 wt %. In particular, plasticizers such as phthalates, adipates, trimellitate esters, polyesters, and other functionalized plasticizers as disclosed in, for example, U.S. Pat. Nos. 3,318,835; 4,409,345; WO 02/31044 A1; and P
Waxes
Preferred waxes suitable for use in the compositions of this invention include: polar waxes, non-polar waxes, Fischer-Tropsch waxes, oxidized Fischer-Tropsch waxes, hydroxystearamide waxes, functionalized waxes, polypropylene waxes, polyethylene waxes, wax modifiers, amorphous waxes, carnauba waxes, castor oil waxes, microcrystalline waxes, beeswax, carnauba wax, castor wax, spermaceti wax, vegetable wax, candelilla wax, japan wax, ouricury wax, douglas-fir bark wax, rice-bran wax, jojoba wax, bayberry wax, montan wax, peat wax, ozokerite wax, ear wax, ceresin wax, petroleum wax, paraffin wax, polyethylene wax, chemically modified hydrocarbon wax, substituted amide wax, and combinations and derivatives thereof. In some embodiments, the polar and non-polar waxes may be used together in the same composition. In a preferred embodiment, compositions of this invention comprise no waxes.
Polymers
In some embodiments the polyolefin composition of this invention may be blended with up to 25 wt % (preferably up to 20 wt %, preferably up to 15 wt %, preferably up to 10 wt %, preferably up to 5 wt %), based upon the weight of the composition, of one or more additional polymeric additives. Suitable polymers include:
In a preferred embodiment, compositions of this invention comprise no added polymeric additives, or if they are present the polymeric additives are present at 0.5 wt % or less.
In a particularly preferred embodiment, compositions of this invention comprise less than 10 wt % LLDPE having a density of 0.912 to 0.935 (preferably less than 5 wt %, preferably less than 1 wt %, preferably 0 wt %), based upon the weight of the composition.
Preparing the Polyolefin Composition
The polyolefin(s), NFP(s), filler(s), and optional additives components of the polyolefin composition of the present invention can be combined using any suitable means known in the polymer processing art. Those skilled in the art will be able to determine the appropriate procedure to balance the need for intimate mixing with the desire for process economy. For example, one or more polyolefin component can be in the form of pellets or reactor granules, which are combined with the NFP(s), filler(s), and optional additives by simple physical blending of constituent pellets and/or granules, since the forming of articles includes a (re)melting and mixing of the raw material(s). However, in some fabrication processes such as compression molding, little mixing of the raw material(s) occurs, and a pelletized melt blend would be preferred over simple physical blends of the constituent pellets and/or granules. In this case, the constituents are melt blended first, to provide a compounded product.
The polyolefin components may be in any physical form when blended with the NFP(s), filler(s), and optional additives. For example, they may be in the form of reactor granules (i.e., granules of polymer that are isolated from the polymerization reactor prior to any processing procedures), which typically have an average diameter of 50 μm to 5 mm, or in the form of pellets that are formed from melt extrusion of the reactor granules, which typically have an average diameter of from 1 to 10 mm.
The polyolefin(s), NFP(s), filler(s), and optional additives can be blended by any suitable means. For example, they may be blended in a tumbler, static mixer, batch mixer, extruder, or a combination thereof that is sufficient to achieve an adequate dispersion of the components. More particularly, the components may be blended by any suitable means to form the polyolefin composition of the present invention, which is then suitable for further processing into useful articles.
Preferably, the composition is prepared by combining the components in a melt-blending (compounding) step and subsequently pelletizing the blend, using either an underwater pelletizer or a strand-cut approach (i.e., a water batch and dry pelletizer); these pellets are then used in a process to fabricate articles. This approach may involve an on-line “finishing” extruder associated with a polymerization unit, or it may involve an off-line “compounding” extruder dedicated to melt blending. Alternatively, the composition may be prepared by combining the components during a process used to fabricate articles, without first making a pelletized version of the composition; here, NFP is added to other components in a production extruder, such as the extruder on an injection molding machine or on a continuous extrusion line, and thereafter directly processed into a film, sheet, fiber, profile, etc. In either case, production rates may be between 5 and 3000 kg/hr.
The blending may involve “dry blending” wherein the polyolefin(s) are combined with the NFP(s) without melting. For example, one method is to contact the components in a tumbler or bowl mixer, such as a high-speed Henschel mixer. The polyolefin(s) are preferably in the form of reactor granules (this works particularly well with ICPs and propylene polymers), but dry blending can also involve pellets. The dry blending step can then be followed, if desired, by melt blending in an extruder.
Another method of blending the components is to melt blend the polyolefin(s), either in pellet or granule form, with the NFP(s) and optionally with the filler(s) and/or additives in a batch mixer, such as a Banbury mixer.
Another method of blending the components is to melt blend the polyolefin(s), either in pellet or granule form, with the NFP(s) and optionally the filler(s) and/or additives in an extruder, such as a single-screw extruder or a twin-screw extruder. Extrusion technology for polyolefins and polyolefin blends is well known in the art, and is described in more detail in, for example, P
NFP may be directly injected into the polymer melt using a liquid injection device at some point along the barrel, as in the case of a twin-screw extruder, or through an opening in a hollow screw shaft, as in the case of a single-screw extruder. NFP is preferably added downstream from the polymer melt zone, but alternatively the NFP can be added at a point where the polymer(s) have not fully melted yet. For example, in a twin-screw extruder, NFP can be injected after the first barrel section (preferably after the first third of the barrel, more preferably in the last third of the barrel). Preferably, NFP is added downstream of filler addition. An NFP addition point may be on top of conveying elements of screw, or on top of liquid mixing elements of screw, or prior to kneading elements of screw, or prior to liquid mixing elements of the screw. The extruder may have more than one (preferably two or three) NFP addition points along the barrel or screw shaft. Optionally, the NFP can be added via the extruder fed throat.
Addition of NFP is preferably by controlled metering; e.g., using a loss-in-weight feeder or a calibrated flow-rate meter. Preferably NFP delivery is via a pump (such as a piston, gear, or diaphragm pump) capable of generating a delivery pressure of at least 5 bar (preferably at least 10 bar, preferably at least 20 bar, preferably at least 30 bar, preferably at least 40 bar). (1 bar=100 kPa).
Preferably, the extruder is a twin-screw extruder with a length to diameter ratio, L/D, of 20-80 (preferably 30-60, preferably 25-50, preferably 35-45) and/or a screw diameter of 20 to 200 mm. Preferably the screw design contains liquid mixing elements (gear-type elements) that create high surface renewal of the polymer, which promotes homogenization at high fluid concentrations. Such extruders are know in the art and are manufactured by Coperion Werner-Pfleiderer, Berstorff, Leistriz, and others.
The components may also be blended by a combination of methods, such as dry blending followed by melt blending in an extruder, or batch mixing of some components followed by melt blending with other components in an extruder. One or more components may also be blended using a double-cone blender, ribbon blender, or other suitable blender, or in a Farrel Continuous Mixer (FCM).
Blending may also involve a “masterbatch” approach, where the target NFP concentration is achieved by combining neat polyolefin(s) and optionally filler and/or additives with an appropriate amount of pre-blended masterbatch (i.e. a blend of polymer, NFP, and optionally filler and additives that has been previously prepared at a higher concentration of NFP than desired in the final blend). This is a common practice in polymer processing, typically used for addition of color, additives, and fillers to final compositions. Dispersion (or “letdown”) of the masterbatch may take place as part of a processing step used to fabricate articles, such as in the extruder on an injection molding machine or on a continuous extrusion line, or during a separate compounding step.
The components may be blended in solution by any suitable means to form the polyolefin composition, by using one or more solvents that dissolve the polyolefin and NFP components to a significant extent. The blending may occur at any temperature or pressure where the NFP and the polyolefin remain in solution. Preferred conditions include blending at high temperatures, such as 20° C. or more above the melting point of the polymer. For example, iPP would typically be solution blended with the NFP at a temperature of 200° C. or more. Such solution blending would be particularly useful in processes where the polymer is made by a solution process and the NFP is added directly to the finishing train, rather than added to the dry polymer in another blending step altogether. It would also be particularly useful in processes where the polymer is made in a bulk or high pressure process where the polymer and the NFP were soluble in the monomer, where the NFP may be added directly to the finishing train. Similarly, a filler could be added to the finishing train.
Applications
The compositions of this invention may be used in any known application involving molding or extrusion, including consumer goods, industrial goods, construction materials, packaging materials, and automotive parts. Articles may be made or formed by any useful discrete molding or continuous extrusion means for forming and shaping polyolefins known in the art, including: compression molding, injection molding, co-injection molding, gas-assisted injection molding, blow molding, multi-layer blow molding, injection blow molding, stretch blow molding, extrusion blow molding, transfer molding; cast molding, rotational molding, foam molding, slush molding, transfer molding, wet lay-up or contact molding, cast molding, cold forming matched-die molding, thermoforming, vacuum forming, film blowing, film or sheet casting, sheet extrusion, profile extrusion or co-extrusion, fiber spinning, fiber spunbonding, fiber melt blowing, lamination, calendering, coating, pultrusion, protrusion, draw reduction, foaming, or other forms of processing such as described in, for example, P
Non-limiting examples of desirable articles of manufacture made from compositions of the invention include films, tapes, sheets, fibers, tubing, pipes, coatings, fabrics (woven and nonwoven), tarps, agricultural barriers, packaging (durable and disposable), household appliances (washing machines, refrigerators, blenders, air conditioners, etc.), furniture (indoor and outdoor, such as tables, chairs, benches, shelving, etc.), sporting equipment (skis, surfboards, skateboards, skates, boots, sleds, scooters, kayaks, paddles, etc.), solid wheels, stadium seating, amusement park rides, personal protective equipment (safety helmets, shin guards, etc.), emergency response equipment, cookware, utensils, trays, pallets, carts, tanks, tubs, pond liners, storage containers (crates, pails, jars, bottles, etc.), toys, child car seats and booster chairs, medical devices, sportswear, luggage, tool housings (for drills, saws, etc.), electronics housings (for televisions, computers, phones, hand-held devices, media players, stereos, radios, clocks, etc.), building construction materials (flooring, siding, roofing, counter tops, electrical housings and connectors, etc.), lighting, gardening equipment (handles on shovels, wheelbarrows, etc.), playground equipment, motor housings, pump housings, battery housings, instrument housings, switches, knobs, buttons, handles, pet supplies, laboratory supplies, personal hygiene devices (razors, brushes, hairdryers, etc.), cleaning supplies (brooms, dust pans, etc.), musical instrument cases, statues, trophies, artwork, costume jewelry, picture frames, eyeglass frames, plant pots, firearm components, and automotive components.
Further non-limiting examples of desirable articles of manufacture made from compositions of the invention useful in vehicles (such as cars, trucks, buses, boats, all terrain vehicles, personal water craft, golf carts, snowmobiles, motorcycles, mopeds, tractors, mowers, wagons, bicycles, airplanes, helicopters, trains, military machines, gondolas, and the like) include: bumpers and bumper fascias; exterior body panels, door panels, and grills; exterior trim, including body side moldings, side cladding and molding, end caps, hoods, deck lids, mirror housings, roof racks, wheel covers, wheel liners, wheel flares, fender liners, hub caps, running boards, step pads, sill plates, air dams, splash shields, mud guards, bed liners, and rocker panels; fuel tanks; interior trim, including steering column covers, consoles, door panels, pillars, supports, knobs, buttons, handles, and safety screens; instrument panels and dash boards; knee bolsters; passenger side airbag covers; headliners; glove boxes, trays, cup holders, compartments, and lids; seat components, including backs, supports, and safety belt securing devices; under-hood applications, including battery trays and fan shrouds; electrical housings; cable bearings; and structural components, including door carriers, truck bed separators, load floors, and trunk dividers.
Preferably, the article made from compositions of the invention has at least one overall dimension, such as length, greater than 30 cm (preferably greater than 60 cm, preferably greater than 90 cm, preferably greater than 120 cm). More preferably, said article is an automotive part. Most preferably, said article is fabricated by an injection molding process.
In alternate embodiments, this invention relates to:
Unless otherwise noted, physical and chemical properties described herein are measured using the following test methods:
Polyolefin Test Methods
Fluid Test Methods
Composition Test Methods
13C-NMR (see below)
13C-NMR (see below)
Dynamic Mechanical Analysis (DMA)
The glass transition temperature (Tg) is measured using dynamic mechanical analysis. This test provides information about the small-strain mechanical response of a sample as a function of temperature over a temperature range that includes the glass transition region and the visco-elastic region prior to melting. Specimens are tested using a commercially available DMA instrument (e.g., TA Instruments DMA 2980 or Rheometrics RSA) equipped with a dual cantilever test fixture. The specimen is cooled to −130° C. then heated to 60° C. at a heating rate of 2° C./min while subjecting to an oscillatory deformation at 0.1% strain and a frequency of 1 rad/sec. The output of these DMA experiments is the storage modulus (E′) and loss modulus (E″). The storage modulus measures the elastic response or the ability of the material to store energy, and the loss modulus measures the viscous response or the ability of the material to dissipate energy. The ratio of E″/E′, called Tan-delta, gives a measure of the damping ability of the material; peaks in Tan-delta are associated with relaxation modes for the material. Tg is defined to be the peak temperature associated with the β-relaxation mode, which typically occurs in a temperature range of −80 to +20° C. for polyolefins. In a hetero-phase blend, separate α-relaxation modes for each blend component may cause more than one Tg to be detected for the blend; assignment of the Tg for each component are preferably based on the Tg observed when the individual components are similarly analyzed by DMA (although slight temperature shifts are possible).
Differential Scanning Calorimetry (DSC)
Crystallization temperature (Tc) and melting temperature (or melting point, Tm) are measured using Differential Scanning Calorimetry (DSC) on a commercially available instrument (e.g., TA Instruments 2920 DSC). Typically, 6 to 10 mg of molded polymer or plasticized polymer are sealed in an aluminum pan and loaded into the instrument at room temperature. Melting data (first heat) is acquired by heating the sample to at least 30° C. above its melting temperature, typically 220° C. for polypropylene, at a heating rate of 10° C./min. The sample is held for at least 5 minutes at this temperature to destroy its thermal history. Crystallization data are acquired by cooling the sample from the melt to at least 50° C. below the crystallization temperature, typically −50° C. for polypropylene, at a cooling rate of 20° C./min. The sample is held at this temperature for at least 5 minutes, and finally heated at 10° C./min to acquire additional melting data (second heat). The endothermic melting transition (first and second heat) and exothermic crystallization transition are analyzed according to standard procedures. The melting temperatures reported are the peak melting temperatures from the second heat unless otherwise specified.
For polymers displaying multiple peaks, the melting temperature is defined to be the peak melting temperature from the melting trace associated with the largest endothermic calorimetric response (as opposed to the peak occurring at the highest temperature). Likewise, the crystallization temperature is defined to be the peak crystallization temperature from the crystallization trace associated with the largest exothermic calorimetric response (as opposed to the peak occurring at the highest temperature).
Areas under the DSC curve are used to determine the heat of transition (heat of fusion, Hf, upon melting or heat of crystallization, Hc, upon crystallization), which can be used to calculate the degree of crystallinity (also called the percent crystallinity). The percent crystallinity (X %) is calculated using the formula: [area under the curve (in J/g)/H° (in J/g)]*100, where H° is the ideal heat of fusion for a perfect crystal of the homopolymer of the major monomer component. These values for H° are to be obtained from the Polymer Handbook, Fourth Edition, published by John Wiley and Sons, New York 1999, except that a value of 290 J/g is used for H° (polyethylene), a value of 140 J/g is used for H° (polybutene), and a value of 207 J/g is used for H° (polypropylene).
Size-Exclusion Chromatography (SEC)
Molecular weight (weight-average molecular weight, Mw, number-average molecular weight, Mn, and molecular weight distribution, Mw/Mn or MWD) are determined using a commercial High Temperature Size Exclusion Chromatograph (e.g., from Waters Corporation or Polymer Laboratories) equipped with three in-line detectors: a differential refractive index detector (DRI), a light scattering (LS) detector, and a viscometer.
The following approach is used for polyolefins. Details not described, including detector calibration, can be found in Macromolecules 34, 6812-6820 (2001).
The various transfer lines, columns, DRI detector and viscometer are contained in an oven maintained at 135° C. The TCB solvent is filtered through a 0.7 μm glass pre-filter and subsequently through a 0.1 μm Teflon filter, then degassed with an online degasser before entering the SEC. Polymer solutions are prepared by placing dry polymer in a glass container, adding the desired amount of TCB, then heating the mixture at 160° C. with continuous agitation for about 2 hours. All quantities are measured gravimetrically. The TCB densities used to express the polymer concentration in mass/volume units are 1.463 g/mL at room temperature and 1.324 g/mL at 135° C. Injection concentration range from 1.0 to 2.0 mg/mL, with lower concentrations being used for higher molecular weight samples. Prior to running a set of samples, the DRI detector and injector are purged, the flow rate increased to 0.5 ml/min, and the DRI allowed to stabilize for 8-9 hours; the LS laser is turned on 1 hr before running samples.
The concentration, c, at each point in the chromatogram is calculated from the baseline-subtracted DRI signal, IDRI, using the following equation:
c=KDRIIDRI/(dn/dc)
where KDRI is a constant determined by calibrating the DRI, and (dn/dc) is the same as described below for the light scattering (LS) analysis. Units on parameters throughout this description are such that concentration is expressed in g/mL, molecular weight is expressed in g/mol, and intrinsic viscosity is expressed in dL/g.
The LS detector is a Wyatt Technology High Temperature mini-DAWN. The molecular weight, M, at each point in the chromatogram is determined by analyzing the LS output using the Zimm model for static light scattering (M. B. Huglin, L
Here, ΔR(θ) is the measured excess Rayleigh scattering intensity at scattering angle θ, c is the polymer concentration determined from the DRI analysis, A2 is the second virial coefficient [for purposes of this invention, A2=0.0006 for propylene polymers and 0.001 otherwise], P(θ) is the form factor for a monodisperse random coil, and Ko is the optical constant for the system:
where NA is Avogadro's number, and (dn/dc) is the refractive index increment for the system. The refractive index, n=1.500 for TCB at 135° C. and λ=690 nm. For purposes of this invention and the claims thereto (dn/dc)=0.104 for propylene polymers and 0.1 otherwise.
A high temperature Viscotek Corporation viscometer, which has four capillaries arranged in a Wheatstone bridge configuration with two pressure transducers, is used to determine specific viscosity. One transducer measures the total pressure drop across the detector, and the other, positioned between the two sides of the bridge, measures a differential pressure. The specific viscosity, ηs, for the solution flowing through the viscometer is calculated from their outputs. The intrinsic viscosity, [η], at each point in the chromatogram is calculated from the following equation:
ηs=c[η]+0.3(c[ηn])2
where c is concentration and was determined from the DRI output.
The branching index (g′) is calculated using the output of the SEC-DRI-LS-VIS method as follows. The average intrinsic viscosity, [η]avg, of the sample is calculated by:
where the summations are over the chromotographic slices, i, between the integration limits. The branching index g′ is defined as:
where, for purpose of this invention and claims thereto, α=0.695 for ethylene, propylene, and butene polymers; and k=0.000579 for ethylene polymers, k=0.000262 for propylene polymers, and k=0.000181 for butene polymers. Mv is the viscosity-average molecular weight based on molecular weights determined by LS analysis.
Composition Distribution Breadth Index (CDBI)
CDBI is a measure of the composition distribution of monomer within the polymer chains. It is measured as described in WO 93/03093, with the modification that any fractions having a weight-average molecular weight (Mw) below 20 kg/mol are ignored in the calculation.
13C-NMR Spectroscopy on Polyolefins
Polypropylene microstructure is determined by 13C-NMR spectroscopy, including the concentration of isotactic and syndiotactic diads ([m] and [r]), triads ([mm] and [rr]), and pentads ([mmmm] and [rrrr]). The designation “m” or “r” describes the stereochemistry of pairs of contiguous propylene groups, “m” referring to meso and “r” to racemic. Samples are dissolved in d2-1,1,2,2-tetrachloroethane, and spectra recorded at 125° C. using a 100 MHz (or higher) NMR spectrometer. Polymer resonance peaks are referenced to mmmm=21.8 ppm. Calculations involved in the characterization of polymers by NMR are described by F. A. Bovey in P
The “propylene tacticity index”, expressed herein as [m/r], is calculated as defined in H. N. Cheng, Macromolecules, 17, 1950 (1984). When [m/r] is 0 to less than 1.0, the polymer is generally described as syndiotactic, when [m/r] is 1.0 the polymer is atactic, and when [m/r] is greater than 1.0 the polymer is generally described as isotactic.
The “mm triad tacticity index” of a polymer is a measure of the relative isotacticity of a sequence of three adjacent propylene units connected in a head-to-tail configuration. More specifically, in the present invention, the mm triad tacticity index (also referred to as the “mm Fraction”) of a polypropylene homopolymer or copolymer is expressed as the ratio of the number of units of meso tacticity to all of the propylene triads in the copolymer:
where PPP(mm), PPP(mr) and PPP(rr) denote peak areas derived from the methyl groups of the second units in the possible triad configurations for three head-to-tail propylene units, shown below in Fischer projection diagrams:
The calculation of the mm Fraction of a propylene polymer is described in U.S. Pat. No. 5,504,172 (homopolymer: column 25, line 49 to column 27, line 26; copolymer: column 28, line 38 to column 29, line 67). For further information on how the mm triad tacticity can be determined from a 13C-NMR spectrum, see 1) J. A. Ewen, C
Ethylene content in ethylene copolymers is determined by ASTM D 5017-96, except that the minimum signal-to-noise should be 10,000:1. Propylene content in propylene copolymers is determined by following the approach of Method 1 in Di Martino and Kelchermans, J. Appl. Polym. Sci. 56, 1781 (1995), and using peak assignments from Zhang, Polymer 45, 2651 (2004) for higher olefin comonomers.
Fluid Molecular Weight
The number-average molecular weight (Mn) is determined by one of two methods:
1. For samples having a kinematic viscosity at 100° C. of 10 cSt or less use Gas Chromatography (GC) with a mass spectrometer detector, as generally described in M
2. For samples having a kinematic viscosity at 100° C. of more than 10 cSt use Gel Permeation Chromatography (GPC), as generally described in M
Fluid Carbon Type Composition
Carbon type composition is determined by ASTM D 2140, and gives the percentage of aromatic carbons (CA), naphthenic carbons (CN), and paraffinic carbons (CP) in the fluid. Specifically, CA is the wt % of total carbon atoms in the fluid that are in aromatic ring-type structures; CN is the wt % of total carbon atoms in the fluid that are in saturated ring-type structures; and CP is the wt % of total carbon atoms in the fluid that are in paraffinic chain-type structures. ASTM D 2140 involves calculating a “Viscosity Gravity Constant” (VGC) and “Refractivity Intercept” (RI) for the fluid, and determining the carbon type composition from a correlation based on these two values. However, this method is known to fail for highly paraffinic oils, because the VGC and RI values fall outside the correlation range. Therefore, for purposes of this invention, the following protocol is used: If the calculated VGC (ASTM D 2140) for a fluid is 0.800 or greater, the carbon type composition including CP is determined by ASTM D 2140. If the calculated VGC (ASTM D 2140) is less than 0.800, the fluid is considered to have CP of at least 80%. If the calculated VGC (ASTM D 2140) is less than 0.800 but greater than 0.765, then ASTM D 3238 is used to determine the carbon type composition including CP. If application of ASTM D 3238 yields unphysical quantities (e.g., a negative CA value), then CP is defined to be 100%. If the calculated VGC (ASTM D 2140) for a fluid is 0.765 or less, then CP is defined to be 100%.
Fluid Color
Color is determined on the APHA scale by ASTM D 1209. Note that an APHA color of 100 corresponds to a Saybolt color (ASTM D 156) of about +10; an APHA color of 20 corresponds to a Saybolt color of about +25; and an APHA color of 0 corresponds to a Saybolt color of about +30.
13C-NMR Spectroscopy on Hydrocarbon Fluids
The composition and branching characteristics of paraffinic hydrocarbon fluids is determined by 13C-NMR spectroscopy, following the general procedures and peak assignments outlined in Breitmaier and Voelter, C
NFP Content
The preferred method to determine the NFP content (weight percent basis) in a polyolefin composition is the Extraction Method. Alternatively, the NMR Method can be used. In event of conflict, the Extraction Method shall control.
The Extraction Method involves Soxhlet extraction, wherein at least a majority of the NFP is extracted with refluxing n-heptane. Analysis of the base polymer is also required because it may contain low molecular weight and/or amorphous material that is soluble in refluxing n-heptane. The level of NFP in the blend is determined by correcting its extractables level, in weight percent, by the extractables level for the base polymer, as described below.
The Soxhlet extraction apparatus consists of a 400 mL Soxhlet extractor, with a widened overflow tube (to prevent siphoning and to provide constant flow extraction); a metal screen cage fitted inside the main Soxhlet chamber; a Soxhlet extraction thimble (Whatman, single thickness, cellulose) placed inside the screen cage; a condenser with cooling water and drain; and a one-neck 1000 mL round bottom flask with appropriately sized stir bar and heating mantle.
The procedure is as follows. Dry the soxhlet thimbles in a 95° C. oven for 60 min. Weigh the dry thimble directly after removal from oven; record this weight as A in g. Weigh out 15-20 g of sample (either in pellet or ground pellet form) into the thimble; record as B in g. Place the thimble containing the polymer in the Soxhlet apparatus. Pour 300 mL of HPLC-grade n-heptane into the round bottom flask with stir bar and secure the flask on the heating mantle. Connect the round bottom flask, the soxhlet, and the condenser in series. Pour more n-heptane down through the center of the condenser into the Soxhlet main chamber until the solvent level is just below the top of the overflow tube. Turn on the cooling water to the condenser. Turn on the heating mantle and adjust the setting to generate a rolling boil in the round bottom flask and maintain a good reflux. Allow to reflux for 16 hrs. Turn the heat off but leave the cooling system on. Allow the system to cool down to room temperature. Disassemble the apparatus. Remove the thimble and rinse with a small amount of fresh n-heptane. Allow to air dry in the laboratory hood, followed by oven drying at 95° C. for 90 min. Weigh the thimble containing the polymer directly after removal from oven; record as C in g.
The quantity of extract is determined by calculating the weight loss from the sample, W=(A+B−C), in g. The extractables level, E, in weight percent, is then calculated by E=100(W/B). The NFP content in the blend, P, in weight percent, is calculated by P=E(blend)−E(base polymer).
The NMR Method requires constructing a model based on a calibration curve (or set of calibration curves) of measured parameter(s) as a function of NFP concentration. The calibration blends are prepared using the same polymer and NFP as the blend(s) under investigation but at known NFP concentrations. This set of calibrants must number at least five, and include the neat polymer as well as at least one NFP concentration above the maximum for the blend(s) under investigation but not greater than 50 wt % NFP. The blend(s) under investigation are analyzed under the same conditions as the calibrants, and the NFP content determined by applying the model.
Specifically, the NMR Method involves high-temperature solution-phase 13C-nuclear magnetic resonance (HTS-CNMR). The composition is determined using the reference spectra of the neat polymer and neat NFP, as well as spectra for a set of calibration blends (i.e., prepared from the neat polymer and NFP at known wt % NFP). The spectra are analyzed to determine a set of one or more diagnostic resonances or clusters of resonances that increase or decrease in strength monotonically with increasing NFP content. The corresponding peaks are integrated and their fractional contribution to the total integral calculated as a function of NFP content (weight %) to generate a set of calibration curves. A chemometrics model is developed using these calibration curves to provide a method to calculate the NFP content. The number of diagnostic resonances is chosen to allow the model to predict NFP content with a precision of 1 wt % or better over the calibration range. For a general description of chemometrics and how to develop a chemometrics model, see C
A typical HTS-CNMR procedure is as follows. Samples are prepared in 1,1,2,2-tetrachloroethane-d2, with chromium acetylacetonate [Cr(acac)3] added as a relaxation agent to accelerate data acquisition. The Cr(acac)3 concentration in the stock solvent is approximately 15 mg/ml. Sample concentrations are between 10 and 15 wt %. Free induction decays of 15,000 transients are accumulated at a temperature of 120° C. on a Varian UnityPlus 500 instrument using a 10 mm broadband probe. Spectra are acquired with a 90° carbon excitation pulse, and inverse-gated WALTZ-16 proton decoupling. An acquisition time of approximately 1 second and recycle delay of 3.5 seconds are used to allow quantitative integration. Solvent choice and sample concentration may be adjusted to accommodate different solubility and to minimize spectral interference based on the specific composition of the blend. See C
Permanence
Permanence of the NFP is determined by ASTM D 1203, by measuring the weight loss from the plasticized composition in the form of a 0.25 mm thick sheet, after 300 hours in dry 70° C. oven. Permanence is 100% minus the Corrected % weight loss, where Corrected % weight loss=(% weight loss for the plasticized composition)−(% weight loss for the unplasticized composition under the same test conditions), % weight loss=100×(W−Wo)/Wo, W=weight after drying and Wo is the weight before drying. The unplasticized composition is the same composition as the plasticized composition but without NFP added.
Atomic Force Microscopy (AFM)
AFM is used to determine if a polyolefin blend is a hetero-phase blend. AFM “phase images” acquired using the “tapping-mode” method provide a morphological map of the sample based primarily on modulus, which is a strong function of crystallinity for polyolefins. Therefore, if the sample is a hetero-phase blend, distinct domains will be observed if they have different crystallinity, as is the case for domains of EP Rubber and/or ethylene copolymer in a polypropylene matrix. Other factors that influence the tapping-mode AFM signal, such as adhesion and electrostatic charge, will generally not affect the ability to determine if a polyolefin blend is a hetero-phase blend.
A smooth surface for analysis is prepared by cryofacing a representative sample of the blend using a cryo-ultramicrotome equipped with a diamond knife and operated at a temperature of −130 to −150° C. The typical scan size is 20 microns by 20 microns, but smaller or larger scan sizes can be used depending on the size scale of the morphological features. The minimum size scale for a domain detectable by AFM is about 0.1 micron.
In tapping-mode AFM, a cantilever (equipped with a tip and housed in a scanner head) is oscillated at or slightly below its resonant frequency, which ensures repulsive contacts (i.e., positive phase shifts). Typical frequencies used are 50-100 kHz, but will vary depending on the actual stiffness of the assembly. During the imaging scan, the tip intermittently strikes the sample as the scanner head moves over the surface. A feedback loop maintains a constant oscillation amplitude of the cantilever based on the signal acquired by a photodiode detector that measures the intensity of light reflected from a laser aimed at the cantilever, which varies as the cantilever deflects. This constant oscillation amplitude insures a constant tip-sample interaction so features seen in the image are due to tip response to the sample and not factors driving the cantilever. The height image is determined by the vertical (z position) of the scanner at any (x, y) position on the surface. The phase image is determined by the phase shift between the driving oscillation for the cantilever and the response oscillation at any point on the surface. Higher modulus (harder) regions absorb more energy and therefore yield a larger phase shift compared to lower modulus (softer) regions. Specific parameters used to set the response of the feedback loop (integral and proportional gains) and the oscillation amplitude set-point (which is a fraction of the free oscillation amplitude) are readily established by those familiar with tapping-mode AFM.
Flow Marks
The tendency for a polyolefin material to exhibit flow marks (or “tiger striping”) is evaluated by injection molding a plaque 14 in (35.6 cm), 5 in (12.7 cm) wide, 1 in (2.5 mm) thick at a melt temperature of 220° C., a mold temperature of 27° C., and a fixed injection speed. Prior to injection molding, carbon black is added to the test composition via a masterbatch to give a final carbon black treat rate of about 1 wt %. The severity of any visible flow marks is judged by a trained operator and assigned a “visibility rating” according to the following scale: 0=none, 1=very slight, 2=slight, 3=moderate, 4=severe. The tendency to exhibit flow marks is judged by measuring the distance from the gate to the first visible flow mark.
Scratch Resistance
The tendency for a polyolefin material to resist visible damage when scratched is evaluated using the Ford 5-Figer Scratch Test on an injection-molded plaque with an embossed surface pattern, specifically the CPM493 Stipple. Prior to injection molding, carbon black is added to the test composition via a masterbatch to give a final carbon black treat rate of about 1 wt %. The scratch resistance rating is the maximum load on the scratch finger that does not yield visible damage, as judged by a trained operator.
The present invention, while not meant to be limited by, may be better understood by reference to the following examples and tables.
Blend components used to prepare the Example Blends are reported in Table 1; compositions of Example (E) and Comparative (C) blends are reported in Tables 2a and 2b; evaluation results for Example (E) and Comparative (C) blends are reported in Tables 3a and 3b.
Blends were prepared by melt-mixing all components on a ZSK-30 twin-screw extruder (30 mm diameter) with underwater pelletizer, using loss-in-weight feeders for adding components through the extruder feed-throat. Example blends were prepared by melt-mixing a masterbatch composition with other components to yield the final composition, again using the ZSK-30 twin-screw extruder and feed-throat addition of all components except wollastonite, which was added using a side feeder. Two masterbatch (MB) compositions were prepared on a ZSK-25 twin-screw extruder (25 mm diameter, 44 L/D, 400 RPM) with underwater pelletizer, loss-in-weight feeders for addition of the solid components through the extruder feed-throat and for liquid injection of the NFP (injection point at barrel section 8 of 11):
All documents described herein are incorporated by reference herein, including any priority documents and/or testing procedures to the extent they are not inconsistent with this text, provided however that U.S. Ser. Nos. 10/782,228, 10/640,435, 60/402,665, 10/634,351, are not incorporated by reference herein. As is apparent from the foregoing general description and the specific embodiments, while forms of the invention have been illustrated and described, various modifications can be made without departing from the spirit and scope of the invention. Accordingly, it is not intended that the invention be limited thereby. Likewise, the term “comprising” is considered synonymous with the term “including” for purposes of Australian law.
This application is a continuation in part of U.S. Ser. No. 10/782,228 filed Feb. 19, 2004 (now granted as U.S. Pat. No. 7,531,594), which is a continuation in part of Ser. No. 10/640,435 filed Aug. 12, 2003 (now granted as U.S. Pat. No. 7,619,026), which claims priority to and the benefit of U.S. Ser. No. 60/402,665, filed Aug. 12, 2002. U.S. Ser. No. 10/782,228 is also a continuation in part of Ser. No. 10/634,351 filed Aug. 4, 2003 (now granted as U.S. Pat. No. 7,632,887), which claims priority to and the benefit of U.S. Ser. No. 60/402,665, filed Aug. 12, 2002.
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| Number | Date | Country | |
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| 20080045638 A1 | Feb 2008 | US |
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| 60402665 | Aug 2002 | US |
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| Child | 10640435 | US |
