1. Field of the Invention
The present invention relates to laminates. More particularly, the invention relates to a laminate formed in part from a slurry comprising a thermoplastic resin and a mix of a variety of different shaped and coated laminate enhancing agents, and to novel processes for forming the inventive laminate.
2. Background
Decorative laminates are well-known and used, for instance, as covering material for walls, cupboard doors, desktops, tabletops, and other furniture; as flooring material; etc. Such laminates are often made of a décor sheet sandwiched between a core and an overlay.
The core typically comprises a plurality of conventional dry or treated thermosetting resin-impregnated prepregs of continuous paper or sheets respectively. The resin in the uppermost of these continuous papers or sheets typically comprises a thermosetting resin such as a melamine-formaldehyde resin, while the rest of the continuous papers or sheets typically comprises a thermosetting resin such as phenol-formaldehyde resin or phenol-urea-formaldehyde resin. The continuous papers or pile of sheets are laminated continuously or discontinuously respectively with the décor sheet and the overlay at a high pressure and an increased temperature. Alternatively, the core may comprise particle board or fiber board, whereby the overlay and the décor sheet may be bonded to the core by gluing or laminating under heat and pressure.
The décor sheet may be either monochromatic or patterned, and is typically formed from paper. Furthermore, The décor sheet is typically impregnated with a melamine-formaldehyde resin.
The overlay is intended to protect the décor sheet from scratching, abrasion, scuffing and marring. Overlays have been used over decorative surfaces for years to provide protection against wear and tear. The principal technology for the high-pressure laminate (HPL) industry has been to use an overlay that is pre-loaded during the paper making process with alumina-based particles, wherein such particles confer wear and abrasion resistance properties onto the overlay. After the alumina-based particles are mixed with the paper fibers during the paper making process, the preloaded overlay is then impregnated with thermoset resin and is pressed under heat and pressure with the core and the decorative components to create the laminate.
This method, however, has proven inadequate in obtaining laminates having ideal characteristics. This is because the alumina-based particles are spread and distributed over a layer of wet alpha-cellulose fibers by a wire on a paper machine in a more or less irregular manner within the whole fiber layer. Some of these particles even pass through the wire. Thus, the alumina-based particles are distributed in an uncontrolled or random way on the overlay. It is very difficult by this known method to achieve an even distribution of the particles on the surface of the paper. As the best effect against abrasion (scuff and mar) of the surface in the finished product is achieved as a result of an even distribution of particles, in the present state of the art, the laminates obtained containing such an overlay will provide uneven quality regarding abrasion resistance.
However, recently in the field of art, a process has been developed whereby the particles are applied to the overlay during the impregnation process rather than during the paper making process. This process is called liquid overlay. In this process, a continuous web of alpha cellulose paper is impregnated with thermoset resin, and is then coated with a slurry comprising alumina-based particles and a thermoset resin. The liquid overlay process creates an overlay, which, when pressed, has far superior clarity to that of the preloaded overlay formed by the process discussed above. Clarity is desirable because it allows the decorative layer underneath the overlay to show through clearly, and the overall color of the laminate is, therefore, closer to the color that the designer of the decorative layer intended.
Despite this improvement, however, there remains the need to improve additional characteristics of the laminate and the process of manufacturing the laminate, This is especially the case with laminates for floors, desktops, and tabletops, and other furniture.
In addition, in the present state of the art, the use of alumina-based particles in the formation of the overlay decreases the, clarity of the decorative layer under the overlay, thereby causing the laminate to appear cloudy. Accordingly, the decorative design is not clearly visible through the laminate. This cloudy look is caused by the fact that the alumina-based particles are on the paper when the paper is introduced to the resin. The resin does not have sufficient saturation time to encapsulate each particle; accordingly, air pockets, which distort the light and cause the milky, cloudy look, are created around the alumina-based particles.
In addition, in the present state of the art, whereby alumina-based particles are used in the formation of the overlay, the damage to or denting of the surface caused by the impact of an object on the surface is increased. This decreased impact resistance is caused by the relatively flat orientation of the alumina-based particles on the overlay.
It would additionally be beneficial to create a laminate having increased impact resistance properties without the need for an overlay, thereby also increasing the overall clarity of the laminate.
In addition, during the manufacturing process, with alumina-based particles, the press plates on the machinery used in manufacturing the laminate suffer wear and must be replaced often.
The above-described deficiencies of the prior art are overcome by creating a laminate comprising an overlay and/or a décor layer formed without or with a reduced amount of alumina to increase the clarity of the décor layer in the final laminate product. To that end, a silicone-based thermoset resin has been produced for use in the formation of the overlay and/or the décor layer of the laminate product.
In an exemplary embodiment, an exemplary overlay may be formed by impregnating a substrate with a thermosetting resin comprised of silicone and coating the substrate with a slurry comprising a thermoset resin comprised of silicone and a mix of laminate enhancing agents, wherein the mix of laminate enhancing agents comprises a percentage of platelet shaped cylindrical, fiber-like shaped particles comprising at least one or more of glass, ceramic, plastic, and the like, and further wherein the percentage of platelet, cylindrical or fiber-like shaped particles used to form the overlay is based upon desired a clarity and/or based upon a desired scuff and mar resistance. The resulting overlay demonstrates superior properties of wear performance, clarity, scuff resistance, scratch resistance, mar resistance, abrasion resistance and impact resistance. Additionally, to further enhance the above-stated characteristics, the overlay may be formed with additional thermosetting resin layers comprised of silicone, wherein the additional thermosetting resin layers are applied to the composite after the composite containing the thermoset resin and the slurry is cured.
The present disclosure further supports a process for the formation of a novel décor layer, which may be used to form a laminate without the additional need for an overlay. In an exemplary embodiment, the décor layer may be formed by impregnating a conventional décor sheet with a silicone-containing thermosetting resin composition and then coating the impregnated décor sheet with a slurry comprising a silicone-containing thermoset resin composition and a mix of laminate enhancing agents to form a décor layer. Additionally or alternatively, the décor sheet may be treated with a mix of laminate enhancing agents at the printing stage of the formation of the décor sheet and, hence, prior to impregnation of the décor sheet with a thermoplastic resin. The mix of laminate enhancing agents comprises a percentage of platelet, cylindrical, fiber-like shaped particles comprising at least one or more of glass, ceramic, plastic, and the like, wherein the percentage of platelet, cylindrical, fiber-like shaped particles used to form the décor sheet is based upon a desired clarity and/or based upon a desired scuff and mar resistance. The décor layer, which comprises the platelet, cylindrical, fiber-like shaped particles, may be laminated to a core to form a laminate having superior properties of wear performance, clarity, scuff resistance, scratch resistance, mar resistance, and abrasion resistance.
Both the overlay and the décor layer disclosed herein may be formed via liquid overlay technology. The process used to form the overlay and the décor layer, which comprises applying either a mix of laminate enhancing agents or a silicone slurry comprising the laminate enhancing agents to the décor sheet at the printing stage, or the silicone slurry to the overlay substrate and/or to the décor sheet at the treating stage, creates a laminate that, when pressed, has superior clarity and abrasion-, scuff-, mar- and impact resistance as compared to prior art laminates formed by conventional processes.
Alternatively or in addition, the laminate enhancing agents may be coated with a powder silicone or a liquid silicone prior to introducing the laminate enhancing agents into the resin.
Silicone may be utilized in lieu of or in addition to aluminum oxide in the slurry. Alternatively or in addition, silicone powder may be used to coat the platelet, cylindrical, fiber-like shaped particles, utilized as additives. Silicone in cross-linked compositions wherein the molecules are linked together is preferred for this function.
The silicone disclosed herein is preferred due to its properties. The disclosed silicone is any of a diverse class of polymers manufactured as fluids, resins or elastomers. They are partially organic compounds, but, unlike most polymers, they have a backbone containing no carbon, composed instead of alternating silicon and oxygen atoms. In most silicones, two organic groups usually methyl or phenyl, are attached to each silicon atom. Silicones in general are exceptionally stable and inert.
In terms of composition, atoms of silicon and oxygen alternate in a chain; various organic radicals, such as the methyl group CH3, are bound to the silicon atoms. Silicones, which are unusually stable at extreme temperatures (both high and low), may occur as liquids, rubbers, resins, or greases. Silicones are prepared from halides of organic silicon compounds by decomposition. Such compounds are chosen and used in mixtures that allow the desired molecular weight and degree of cross-linking to be obtained in the final polymer. Water repellent, chemically inert, and stable at extreme temperatures, silicones are used as protective coatings and electrical insulators and in caulk.
In the present invention, the use of silicone in the formation of the overlay and/or the décor layer can eliminate and/or greatly reduce the amount of formaldehyde-based resins used to form the overlay and/or the décor layer, thereby enhancing the wear life of the press plates, and reducing and/or eliminating the use of formaldehyde in the manufacturing process.
The present invention is aimed at forming a laminate having improved properties of wear performance, clarity, scuff resistance scratch resistance, mar resistance, abrasion resistance, and impact resistance and, in the manufacturing process, effective in decreasing wear to the press plates. More particularly, the laminate may comprise a décor layer and/or an overlay formed from silicone-containing thermoset resins, wherein such resins may replace the need for traditionally used alumina-containing thermoset resins and/or formaldehyde-containing thermoset resins, thereby improving the clarity of the laminate, improving the wear performance of the laminate, improving the scuff and mar resistance of the laminate, and reducing plate wear.
Such an improved laminate may comprise an overlay formed by impregnating a substrate with a silicone-containing thermoset resin, and then by coating the impregnated substrate with a slurry, wherein the slurry comprises a silicone-containing thermoset resin and a mix of laminate enhancing agents, which include platelet, cylindrical, fiber-like agents formed from materials comprising, for example, at least one of glass, plastic, ceramic, and the like. As will be discussed in further detail below, the laminate enhancing agents may further include silicone coated or silicone based particles to improve the scuff resistance and mar resistance of laminate overlays. The resulting composite may then be cured to form a cured composite. The process may further comprise applying at least one or more additional silicone-containing thermoset resin layers to the cured composite.
The substrate may comprise conventional laminate overlay substrates. Accordingly, the substrate may include, for example and without limitation, at least one of paper, glass, mica, and the like, and may comprise one or multiple layers of these materials.
The silicone-containing thermoset resin(s) used to impregnate the substrate, the silicone-containing thermoset resin(s) used to form the slurry, and the silicone-containing thermoset resin(s) used to form the additional silicone-containing thermoset resin layers, may comprise a wide variety of thermoset resin compositions, and may be identical to or different from each other in composition. The thermoset resin may include silicone powder or liquid or silicone coated particles in lieu of those thermoset resins which are conventional in the laminate industry. Additionally, the use of any size and shape of silicone particles may be used to form the silicon-containing thermoset resin.
The thermoset resin may include low pressure formulations and high pressure formulations depending on whether low pressure laminates or high pressure laminates are desired. In general, high pressure formulations have a low mole ratio and low pressure formulations have a high mole ratio, wherein the mole ratio may vary widely and constitutes the proportion between the concentration of the cross linking agent, for example, the silicone, and the concentration of the thermoset agent, e.g., the melamine, in the thermoset resin, wherein the mole ratio is selected to confer certain desired characteristics onto the laminate based on the use of the laminate.
Additionally, the silicone-containing thermoset resin used in the process disclosed herein may comprise certain additives to increase certain desired properties. For example, the additives may comprise at least one of plasticizers which control the flexibility of the surface layer, saturation agents which promote clarity, catalysts which control flexibility and aid in the curing of the surface layer, release agents which assist in production, antiblock agents which reduce blocking or sticking, and the like. The additives may be added at various points in the process disclosed herein.
As previously stated, the slurry, which is preferably coated on the silicone-containing thermoset resin that impregnates the substrate of the overlay, comprises a silicone-containing thermoset resin and a mix of laminate enhancing agents, wherein the laminate enhancing agents include platelet, cylindrical, fiber-like shaped laminate enhancing agents, which may be coated with a silicone-based powder and/or a silicone-based liquid. As stated above, the thermoset resin in the slurry may comprise those thermoset resins described above, wherein the thermoset resin that impregnates the substrate may comprise a composition that is identical to or different from the thermoset resin in the slurry with regards to both the specific agents used in the composition and the quantities of agents used in the composition.
The platelet, cylindrical, fiber-like shaped laminate enhancing agents may comprise a variety of materials, wherein exemplary materials include, for example and without limitation, at least one of glass, silica, silicon carbide, a ceramic, a plastic (such as, for example, one or more of polyethylene, polypropylene, and the like), and the like, wherein laminate enhancing agents comprising at least one of glass, a ceramic, and a plastic are especially preferred and may be coated with silicone powder. Additionally, the platelet, cylindrical, fiber-like shaped laminate enhancing agents may be sized or unsized, wherein when sized, they are preferably coated with saline and cationic agents and may be coated with silicone powder or liquid.
In addition to the material used to form the platelet, cylindrical, fiber-like shaped laminate enhancing agents, the geometrical shape of the laminate enhancing agents is also important in conferring the desired properties of clarity, scratch resistance, mar resistance, abrasion resistance, and impact resistance onto the final laminate product. The length of the platelet, cylindrical, fiber-like shaped agents forming the mix of laminate enhancing agents is longer than the diameter of the particles. Thus the agents are fiber-like. In an exemplary embodiment, the platelet, cylindrical, fiber-like shaped laminate enhancing agents comprise particles having a diameter of about 1 micrometer to about 100 micrometers, and a length of about 2 micrometers to about 500 micrometers. Additionally, in an exemplary embodiment, the platelet, cylindrical, fiber-like shaped laminate enhancing agents forming the mix are selected such that there is diversity in the overall length of the platelet, cylindrical, fiber-like shaped laminate enhancing agents forming the mix. Additionally, to achieve diversity in the length of the cylindrical, fiber-shaped laminate enhancing agents, the particles may be cut at an angle.
For purposes of clarification, a prior art alumina-based laminate enhancing agent is depicted in
Additionally, the platelet, cylindrical, fiber-like shape of the platelet, cylindrical, fiber-like shaped laminate enhancing agents is optically superior to the spherical fused type-shape of laminate enhancing agents which are depicted in
Furthermore, the silicone powder coating of the laminate enhancing agents can also have an impact on press plate life. The standard spherical particles used in conventional overlays have more potential to cause premature press plate wear when the overlay is pressed as the prior art uncoated particles can act like sandpaper. The silicone coated laminate enhancing agents in the overlay of the present invention, however, wherein such agents are preferably within the range of about 1 micrometer to about 100 micrometers in diameter and about 2 micrometers to about 500 micrometers in length, have less potential to cause premature press plate wear. Additionally, a larger variation in length and diameter as well as the silicone coating of the fibers provides a greater cushion against press plates and less potential to cause premature plate wear.
Despite the benefits of having platelet, cylindrical, fiber-like shaped laminate enhancing agents randomly oriented onto the substrate when pressed, if additional wear resistance is desired, the mix of silicone powder coated laminate enhancing agents may further comprise crystalline shaped laminate enhancing agents, wherein it is contemplated that an unlimited matrix of combinations of shapes, sizes and concentrations of laminate enhancing agents may be used to obtain the desired characteristics in the final product. Such silicone coated crystalline shaped laminate enhancing agents may comprise, for example, at least one of alumina, silica carbide, silicon, glass, ceramic, plastic, and the like, wherein alumina is especially preferred. However, in an exemplary embodiment, it is contemplated that the mix may comprise at least about 5 percent of silicone coated platelet, cylindrical, fiber-like shaped laminate enhancing agents, wherein the percentage is based on the total number of laminate enhancing agents contained in the mix which forms, at least in part, the slurry. Other additives, such as cellulose and/or glass beads may be added to the slurry and may be coated with silicone powder to further protect the press plates from wear.
An exemplary process used to form the inventive overlay and laminate of the present invention is discussed with reference to
The process may further comprise applying a silicone-containing thermoset resin to a substrate, and then applying the slurry to the substrate while the substrate is still wet from the application of the silicone-containing thermoset resin. In an exemplary embodiment, silicone particles, which form, at least in part, the silicone-containing thermoset resin, may be applied in dry form to a wet thermoset-resin saturated substrate. In this embodiment, the silicone particles may be evenly distributed on top of the thermoset resin saturated substrate before drying the silicone-treated substrate in an oven. Alternatively, the silicone particles may be mixed with the thermoset resin, and the resulting silicone-containing thermoset resin may be coated onto the substrate to form a wet silicone-containing thermoset resin substrate, to which the slurry may be subsequently added. It is noted that the slurry discussed above may or may not be added to a substrate to which the silicone-containing thermoset resin has been applied, In a preferred embodiment, the substrate comprises paper having a continuous web of alpha cellulose, and having a basis weight of about 10 grams per square meter (“gsm”) to about 100 gsm.
The way in which the slurry is applied to the impregnated substrate may be varied. However, in an exemplary embodiment, the method comprises spraying the slurry at the substrate under pressure, as is customarily done in a fountain ARP system. For example, utilizing the principles of the fountain ARP system, a fountain may continuously spray the slurry on to the substrate. The coated substrate may then pass through a set of smooth rotating rolls which meter away the excess slurry.
Additionally or alternatively, use of a receptacle containing the slurry, and a rotating doctor-roll placed within or above the receptacle, as is customarily done in a Gravure system, may be employed. In the Gravure system, the substrate may pass through or within the receptacle and the slurry may be distributed evenly onto the substrate as the substrate is continuously fed through the doctor-roll. More particularly, the Gravure system utilizes a rotating roll which is engraved with open cells. The open cells hold the slurry which is continuously pumped into the cells. As the substrate passes under the rotating roll, the slurry is deposited onto the substrate.
Furthermore, a combination of the two systems, namely a device utilizing a fountain, rolls, and open cells is contemplated by this disclosure. The device may also comprise a scraper plate intended to give an even feeding of the slurry along the surface of, e.g., the Gravure-roll.
Other devices may also be used for application of the slurry to the wet substrate. For instance, one or more of dry powder coating, electrostatic coating, reverse roll technology, and the like, may be employed to apply the slurry to the wet substrate. It is also possible to charge the laminate enhancing agents by means of friction and then apply the slurry to the thermoset resin layer on the wet substrate. This charge can be brought about, for example, by rubbing the particles against a Teflon surface.
Once the composite comprising the silicone-containing thermoset resin-impregnated substrate and the slurry is formed, the composite is dried and cured. After cure, the concentration of the laminate enhancing agents on the coating comprises about 0.1 gsm to about 50 gsm. After dry and cure, the cured composite may be cut for use as an overlay in the formation of a laminate.
Referring to
It is contemplated that one or more of the additional silicone-containing thermoset resin layers may be applied to any one of the slurry coating, the substrate, or to a prior placed additional thermoset resin layer and/or additional layer of slurry. Additionally, in a particularly preferred embodiment, the additional layer of slurry is preferably applied to at least one of the initial layer of slurry, i.e., the layer of slurry that is coated directly onto the substrate, another additional layer of slurry, or to an additional thermoset resin layer, wherein such positioning of the additional layer of slurry is preferably indirectly positioned on the same side of the substrate as the initial layer of slurry, i.e., the additional layer of slurry preferably will not be sandwiched between the substrate and the core when the laminate is formed.
An exemplary method of forming the overlay comprising one or more additional silicone-containing thermoset resin layers comprises impregnating a substrate with about a 5 gsm to about a 250 gsm coating of a thermoset resin, and then coating the silicone-containing thermoset resin-impregnated substrate with about a 5 gsm to about a 250 gsm coating of the slurry. The thermoset resin layer and the slurry may be dried and cured with sufficient time and temperature (about 80 degrees Celsius to about 200 degrees Celsius) to achieve a volatile content of about 2 percent to about 10 percent (as measured at 165 degrees Celsius for 5 minutes). This drying process forms a cured composite. After or partway through the drying process, one or more additional silicone-containing thermoset resin layers and/or slurry layers may be added to the composite, wherein such additional thermoset resin layers and/or slurry layers may be directly added to the dried slurry layer, directly to the substrate, and/or directly to an adjacently placed additional resin layer. After the additional layers are added, the composite may be dried with sufficient time and temperature (about 80 degrees Celsius to about 200 degrees Celsius) to achieve a volatile content of about 2 percent to about 10 percent (as measured at 165 degree Celsius for about 5 minutes).
Exemplary overlays formed from the process set forth in
Referring to
Referring to
Referring to
In addition to the production of a novel overlay, the invention also relates to a process for the production of a decorative thermosetting laminate having an abrasion-resistant overlay, wherein the overlay is formed according to the above-described methods. That is, referring to
In addition to forming a laminate comprising an overlay formed via the application of a slurry comprising a silicone thermoplastic resin and a mix of platelet, cylindrical, fiber-like shaped laminate enhancing agents formed from one or more of glass, ceramic, and plastic, the present invention further encompasses the formation of a laminate comprising a décor layer, wherein a décor sheet, which ultimately forms the décor layer, may be treated with the silicone coated laminate enhancing agents at the printing stage (i.e., the stage at which a design component is applied to the décor sheet), and/or at the treating stage (i.e., the stage at which the décor sheet is impregnated with a thermoplastic resin). When applied at the printing stage, the silicone coated laminate enhancing agents may be applied to the décor sheet in a slurry as described above with reference to the application of a slurry to a substrate forming an overlay and/or in a substantially dry form, i.e., the laminate enhancing agents may be applied directly onto the décor sheet without the use of a slurry; rather, the laminate enhancing agents may include a substantially dry mix of laminate enhancing agents. When applied at the treating stage, the laminate enhancing agents are preferably applied in the slurry.
The décor sheet may include a décor sheet as is typically used in the formation of high pressure laminates and/or low pressure laminates, and may include, for example and without limitation, monochromatic or patterned sheets of paper. After the silicone coated laminate enhancing agents are applied to the décor sheet, either at the printing stage and/or at the treating stage, the décor sheet may be directly laminated to a conventionally used core, such as, for example, paper, particleboard, fiberboard, and the like, wherein the laminate enhancing agents impart the resulting laminate with improved clarity, abrasion resistance, scuff resistance, mar resistance, and impact resistance as compared to prior art laminates. A laminate formed from such a décor layer, may or may not further comprise an overlay, wherein in a preferred embodiment, the laminate does not comprise an overlay, thereby providing improved clarity to the laminate.
As stated above, when the laminate enhancing agents are applied at the printing stage, the décor sheet may be treated with a mix of silicone coated laminate enhancing agents and/or with the slurry, wherein the slurry may be identical to or substantially the same as the slurry discussed above in relation to the overlay. The exemplary processes used to apply the slurry and/or the mix of laminate enhancing agents to the overlay may be identical or substantially identical to the processes used to apply the slurry to the overlay.
When the silicone coated laminate enhancing agents are applied to the décor sheet at the treating stage, the process(es) discussed above in relation to the formation of an overlay, applies equally to the formation of the décor layer. That is, the process for forming the décor layer may comprise impregnating a décor sheet with a thermoset resin composition, and then coating the impregnated décor sheet with the slurry as substantially disclosed above in reference to the overlay. The resulting décor layer may then be cured and dried. The process may further comprise applying at least one or more additional thermoset resin layers to the cured décor layer.
The silicone based thermoset resin composition used to impregnate the décor sheet may comprise those thermoplastic resins and/or additives which were discussed above in relation to the overlay. Additionally, and as stated above, the slurry may be identical to, or substantially similar to that disclosed above in relation to the formation of the overlay, as it imparts essentially the same properties onto the décor layer for essentially the same reasons as disclosed above.
Exemplary processes used to form décor layers are discussed with reference to
The way in which the slurry may be applied to the impregnated décor sheet may be varied. However, in an exemplary embodiment, the method may include any one or more of the methods described above with relation to the method of applying the slurry to the overlay. An exemplary method of applying the slurry to a décor sheet is depicted in
Once the décor layer, comprising the silicone-containing thermoset resin-impregnated décor sheet coated with the slurry, is formed, the resulting décor layer may be dried and cured. After cure, the concentration of the silicone coated laminate enhancing agents on the décor layer may comprise about 0.1 gsm to about 50 gsm. After dry and cure, the cured décor layer may be cut for use as a surface layer in the formation of a laminate.
Referring to
It is contemplated that one or more of the additional thermoset resin composition containing layers may be applied to any one of the slurry coating, the décor layer, or to a prior placed additional thermoset resin composition containing layer and/or additional layer of slurry. Additionally, in a particularly preferred embodiment, the additional layer of slurry is preferably applied to at least one of the initial layer of slurry, i.e., the layer of slurry that is coated directly onto the impregnated décor sheet, another additional layer of slurry, or to an additional thermoset resin composition containing layer, wherein such positioning of the additional layer of slurry is preferably indirectly positioned on the same side of the décor layer as the initial layer of slurry, i.e., the additional layer of slurry preferably will not be sandwiched between the décor layer and the core when the laminate is formed.
An exemplary method of forming the décor layer comprising one or more additional thermoset resin layers comprises impregnating a décor sheet with about a 5 to about a 250 gsm coating of a thermoset resin composition, and then coating the impregnated décor sheet with about a 5 to about a 250 gsm coating of slurry. The coated and impregnated décor layer may be then dried and cured with sufficient time and temperature (about 80 degrees Celsius to about 200 degrees Celsius) to achieve a volatile content of about 2 percent to about 10 percent (as measured at 165 degrees Celsius for 5 minutes). This drying process forms a cured décor layer. After or partway through the drying process, one or more additional thermoset resin composition layers and/or slurry layers may be added to the décor layer, wherein such additional thermoset resin composition layers and/or slurry layers may be directly added to the dried slurry layer, directly to the décor sheet, and/or directly to an adjacently placed additional resin layer. After the additional layers are added, the décor layer may be dried with sufficient time and temperature (about 80 degrees Celsius to about 200 degrees Celsius) to achieve a volatile content of about 2 percent to about 10 percent (as measured at 165 degree Celsius for 5 minutes).
Exemplary décor sheets formed from one or more of the processes set forth in
Referring to
Referring to
Referring to
In addition to the production of a novel décor layer, the invention also relates to a process for the production of a decorative thermosetting laminate having an abrasion-resistant surface layer, wherein the surface layer is formed according to the above-described methods.
Referring to
Referring to
Referring to
In any of the processes set forth in
Although the present invention has been described with reference to the figures, it is to be understood that the invention is not limited thereto. Rather, the invention shall include all obvious modifications and variations to the present disclosure as would occur to one of ordinary skill in the art. Additionally, it is evident that the process according to the invention is not restricted to laminates made of sheets containing silicone based resins with a maximized cross-linked density. Also other thermosetting resins such as polyester resins are possible.
This application claims the benefit of U.S. Provisional Application No. 61/353,371 filed on Jun. 10, 2010.
Number | Date | Country | |
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61353371 | Jun 2010 | US |