Patent Application
20230088586
This disclosure is directed to sealant compositions with low shrinking volume. The sealant compositions include a glass filler. The sealant compositions are useful in a variety of building and construction applications, as well as interior or exterior trim work applications.
Sealant compositions, including latex sealants, often exhibit significant shrinkage. However, low shrinkage is desirable, particularly among professional painters. Shrinkage can present substantial problems. For example, when filling gaps or bridging joints in trim work, cracking or pulling away from edges commonly occurs after sealant cures fully and shrinks down, especially when too little sealant is applied, requiring a second application before painting.
Further, paint film cracking can occur when sealants with high volume shrinkage are painted too soon or with poor quality paint. This is because cracking of paint often results from application of paint at a time when the sealant is only just skinned over (tack-free) and well before beginning to shrink from drying beyond the surface. Many paints used in these situations dry to a non-flexible film while the sealant itself is still drying underneath and slowly shrinking towards its final volume loss from evaporation of volatile components.
Moreover, high shrinkage sealants, such as conventional sealants exhibiting 30-35% volume shrinkage, produce a large gap upon sealing. Often, insertion of backer rods in wide joints before sealant is applied is required because the sealant cannot fill the gap in a single application.
Attempted solutions to address the above problems have failed. For example, attempted solutions have resulted in compositions that have a very low product density (e.g. 5 lbs/gal in U.S. Pat. No. 4,388,424). Such low product density compromises adhesion to various substrates, which would necessitate physically forcing or tooling product onto a surface or into a joint to ensure acceptable bonding in most situations. These attempted solutions also present issues with fragility of the sealant compositions. For at least these reasons, the past solutions are unacceptable.
The present disclosure provides sealant compositions with low shrinking volume that overcome these challenges.
In one aspect, provided herein is a sealant composition comprising a sealant binder composition, a glass filler, and optionally a plastic filler.
In another aspect, provided herein is a method of making a sealant composition comprising a sealant binder composition, a glass filler, and optionally a plastic filler, wherein the method comprises (i) forming a mixture comprising the sealant binder composition, the glass filler, and optionally the plastic filler; and (ii) mixing the mixture.
In yet another aspect, provided herein is a method of using a sealant composition comprising a sealant binder composition, a glass filler, and optionally a plastic filler, wherein the method comprises applying the sealant composition to a work surface.
Sealant compositions in accordance with the present disclosure exhibit low shrinkage volume. The present compositions maximize total volume solids and minimize volatile components to affect as much as possible a reduction of volume shrinkage in the dry/fully cured state. This outcome is accomplished through the combination of a hollow glass filler and a plastic filler included within the matrix of the sealant binder system. In the cured state, compositions in accordance with the present disclosure provide enough polymer volume concentration to give the sealant enough rubbery-elastic extension and recovery qualities needed for passing the ASTM C834 standard.
In many embodiments, the sealant compositions are water-based. In many embodiments, the sealant compositions comprise a latex sealant binder.
In some embodiments, the sealant binder system comprises a sealant polymer. In some embodiments, the sealant binder system comprises a latex sealant. In some embodiments, the sealant binder system comprises a high solids acrylic latex polymer. In some embodiments, the sealant binder system comprises a liquid non-volatile plasticizer.
In some embodiments, the sealant binder system comprises a sealant polymer in the form of a polymer emulsion. In some embodiments, the sealant binder system comprises an acrylic latex polymer in the form of an acrylic polymer emulsion or vinyl-acrylic copolymer emulsion.
In some embodiments, the sealant binder system comprises at least two sealant polymers. In some embodiments, the sealant binder system comprises three or more sealant polymers.
In some embodiments, the sealant binder system comprises a first sealant polymer having a first Tg temperature and a second sealant polymer having a second Tg temperature, wherein the first Tg temperature is less than the second Tg temperature.
In some embodiments, the sealant binder system comprises a first sealant polymer having a first Tg temperature less than about −10° C. In some embodiments, the sealant binder system comprises a first sealant polymer having a first Tg temperature less than about −15° C. In some embodiments, the sealant binder system comprises a first sealant polymer having a first Tg temperature less than about −20° C. In some embodiments, the sealant binder system comprises a first sealant polymer having a first Tg temperature less than about −25° C. In some embodiments, the sealant binder system comprises a first sealant polymer having a first Tg temperature less than about −30° C. In some embodiments, the sealant binder system comprises a first sealant polymer having a first Tg temperature less than about −35° C. In some embodiments, the sealant binder system comprises a first sealant polymer having a first Tg temperature less than about −40° C. In some embodiments, the sealant binder system comprises a first sealant polymer having a first Tg temperature less than about −45° C.
In some embodiments, the sealant binder system comprises a second sealant polymer having a second Tg temperature greater than about −45° C. In some embodiments, the sealant binder system comprises a second sealant polymer having a second Tg temperature greater than about −4° C. In some embodiments, the sealant binder system comprises a second sealant polymer having a second Tg temperature greater than about −35° C. In some embodiments, the sealant binder system comprises a second sealant polymer having a second Tg temperature greater than about −30° C. In some embodiments, the sealant binder system comprises a second sealant polymer having a second Tg temperature greater than about −25° C. In some embodiments, the sealant binder system comprises a second sealant polymer having a second Tg temperature greater than about −20° C. In some embodiments, the sealant binder system comprises a second sealant polymer having a second Tg temperature greater than about - 15° C. In some embodiments, the sealant binder system comprises a second sealant polymer having a second Tg temperature greater than about −10° C. In some embodiments, the sealant binder system comprises a second sealant polymer having a second Tg temperature greater than about −5° C. In some embodiments, the sealant binder system comprises a second sealant polymer having a second Tg temperature greater than about 0° C.
In some preferred embodiments, the preferred polymer system of the sealant binder system is (1) a high solids acrylic latex, with a Tg temperature where, in typical sealant formulations (depending on filler load), it would not necessarily require added plasticizer to meet an ASTM C834 specification; and (2) a lower percentage of higher Tg temperature latex (not as soft) with self-thickening properties and accepting of a relatively higher loading of plasticizer without becoming too tacky. A certain plasticizer chemistry is also important in that it should not swell the polymer particles but act as somewhat of a diluent, thereby reducing base viscosity before any thickening agent is added at the end of the process to adjust for extrusion rate or resistance to slump.
In some embodiments, at least one of the hollow glass filler and the plastic filler is in the form of a shape selected from the group consisting of spheres, spheroids, other shapes with a low surface area to volume ratio, and combinations thereof. In some preferred embodiments, at least one of the hollow glass filler and the plastic filler is in the form of a sphere. Since a sphere has the lowest surface area to volume ratio, packing of spherical particles is more efficient and requires the least amount of binder to “wet out” the spherical filler surface per unit internal volume. This allows for very high-volume percent loading of spherical filler in the formulation while still giving excellent application and tooling characteristics.
In many embodiments, at least one of the hollow glass filler and the plastic filler is low density. In many embodiments, at least one of the hollow glass filler and the plastic filler is hollow.
In some embodiments, the hollow glass filler has a crush strength of at least 1000 psi. In some embodiments, the hollow glass filler has a crush strength of at least 1500 psi. In some embodiments, the hollow glass filler has a crush strength of at least 2000 psi. In some embodiments, the hollow glass filler has a crush strength of at least 2500 psi. In some embodiments, the hollow glass filler has a crush strength of at least 3000 psi. In some embodiments, the hollow glass filler has a crush strength of at least 3500 psi. In some embodiments, the hollow glass filler has a crush strength of at least 4000 psi. In some embodiments, the hollow glass filler has a crush strength of at least 4500 psi. In some embodiments, the hollow glass filler has a crush strength of at least 5000 psi. In some embodiments, the hollow glass filler has a crush strength of at least 5500 psi. In some embodiments, the hollow glass filler has a crush strength of at least 6000 psi.
In some embodiments, the hollow glass filler has an average particle diameter greater than about 10 nm. In some embodiments, the hollow glass filler has an average particle diameter less than about 100 nm. In some embodiments, the hollow glass filler has an average particle diameter less than about 50 nm. In some embodiments, the hollow glass filler has an average particle diameter of about 40 nm. In some embodiments, the hollow glass filler has an average particle diameter of about 30 nm. In some embodiments, the hollow glass filler has an average particle diameter of about 25 nm.
In some embodiments, the hollow glass filler has a density less than about 0.50 g/cc. In some embodiments, the hollow glass filler has a density less than about 0.45 g/cc. In some embodiments, the hollow glass filler has a density less than about 0.40 g/cc. In some embodiments, the hollow glass filler has a density less than about 0.35 g/cc. In some embodiments, the hollow glass filler has a density less than about 0.30 g/cc.
In some embodiments, the plastic filler has an average particle diameter greater than about 10 nm. In some embodiments, the plastic filler has an average particle diameter less than about 200 nm. In some embodiments, the plastic filler has an average particle diameter less than about 150 nm. In some embodiments, the plastic filler has an average particle diameter of about 135 nm. In some embodiments, the plastic filler has an average particle diameter less than about 100 nm. In some embodiments, the plastic filler has an average particle diameter of about 95 nm.
In some embodiments, the plastic filler has a density less than about 0.150 g/cc. In some embodiments, the plastic filler has a density less than about 0.140 g/cc. In some embodiments, the plastic filler has a density less than about 0.130 g/cc. In some embodiments, the plastic filler has a density less than about 0.120 g/cc. In some embodiments, the plastic filler has a density less than about 0.110 g/cc. In some embodiments, the plastic filler has a density less than about 0.100 g/cc. In some embodiments, the plastic filler has a density less than about 0.090 g/cc. In some embodiments, the plastic filler has a density less than about 0.080 g/cc. In some embodiments, the plastic filler has a density less than about 0.070 g/cc.
In some embodiments, the combination of low-density hollow glass spheres and hollow (very low density) plastic spheres is critical in the relationship between average particle size and wall thickness. This combination provides a desirable average compressive strength that resists breakage in processing/mixing equipment under sheer stress from mixing blades, pumping, etc. As the most efficient space filling of the sealant within the binder requires ideally a high percentage of near perfect spheres, any crushed, compressed or partially broken spheres take away from the intended reduction of volume shrinkage and at some level will negatively affect elongation properties necessary to resist joint movement in service.
In some embodiments, the sealant composition further comprises an additional filler. In some embodiments, the addition filler is a non-spherical mineral based filler. Non-spherical mineral based fillers may provide internal structure helpful for building tensile strength.
Generally, the sealant composition may comprise any suitable sealant composition auxiliary component known in the art. In some embodiments, the sealant composition further comprises an auxiliary component selected from the group consisting of rheological additives, organic thickening agents, inorganic thickening agents, adhesion promoters, pigments, dispersants, pigment dispersants, filler dispersants, detergents, non-ionic detergents, cationic detergents, anionic detergents, surfactants, non-ionic surfactants, cationic surfactants, anionic surfactants, biocides, mildew growth inhibitors, plasticizers, oils, process oils, freeze-thaw additives, volatile freeze-thaw additives, non-volatile freeze-thaw additives, pH modifiers, volatile pH modifiers, non-volatile pH modifiers, buffers, and combinations thereof.
In some embodiments, the sealant composition comprises a plasticizer. In some embodiments, the sealant composition comprises a non-volatile plasticizer. In some embodiments, the sealant composition comprises a non-phthalate plasticizer. In some embodiments, the sealant composition comprises a plasticizer selected from the group consisting of benzoates, dibenzoates, dipropylene glycol dibenzoate, diethylene glycol dibenzoate, and combinations thereof.
In some embodiments, the sealant composition is prepared according to a method comprising (i) forming a mixture comprising the sealant binder composition, the glass filler, and optionally the plastic filler; and (ii) mixing the mixture.
In some embodiments, the sealant composition is used according to a method comprising applying the sealant composition to a work surface.
In some embodiments, the work surface is selected from the group consisting of a surface in a building and/or construction application, a surface in an interior trim work application, a wall, a floor, a ceiling, a door, a window, a gap therebetween, and combinations thereof.
In some embodiments, the work surface comprises a material selected from the group consisting of glass, ceramic tile, porcelain tile, ceramic and porcelain tile, concrete, aluminum, plastic, polyvinyl chloride (PVC), wood, drywall, and combinations thereof
In some embodiments, the sealant composition is tested according to a method selected from the group consisting of a volume shrinkage test, a channel volume shrinkage test in accordance with the present disclosure, a petri dish volume shrinkage test in accordance with the present disclosure, ASTM C-834, ASTM C732, ASTM C734, ASTM C736, ASTM C1183, ASTM C1241, ASTM D2202, ASTM D2203, ASTM D2377, ASTM D-412, and combinations thereof.
In some embodiments, a sealant composition in accordance with the present disclosure is a 10-minute paint ready (with 5 minutes for skin time for tooling), low-shrink latex sealant at roughly 84% volume solids. The maximum theoretical shrinkage is 16% at most due simply to loss of volatile components. However, the actual observed shrinkage is less due to internal packing arrangements of primarily the spherical fillers. These arrangements, combined with a relatively rapid dry time, leaves small voids where water or other low-level volatile material escaped from within the wet sealant. These tiny air pockets further lower the dried product density and contribute to between 3-5% less shrinkage under the fully cured theoretical percentage (depending on test method utilized).
In some embodiments, the sealant composition exhibits a volume shrinkage less than about 35% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 34% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 33% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 32% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 31% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 30% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 29% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 28% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 27% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 26% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 25% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 24% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 23% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 22% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 21% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 20% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 19% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 18% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 17% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 16% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 15% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 14% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 13% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 12% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 11% upon drying. In some embodiments, the sealant composition exhibits a volume shrinkage less than about 10% upon drying.
In some preferred embodiments, the sealant composition exhibits a shrinkage less than about 15% upon drying. In some preferred embodiments, the sealant composition exhibits a shrinkage less than about 10% upon drying.
The lower density of sealant compositions in accordance with the present disclosure, relative to conventional sealants without hollow/lightweight fillers, presented a challenge for meeting the ASTM C834 testing protocols, the standard for latex sealants used by building construction contractors and painting trades. A sealant composition in accordance with the present disclosure is particularly relevant due to the volume shrink max requirement within the C834 specification.
Embodiments of the present disclosure include:
Embodiment 1. A sealant composition comprising:
Embodiment 2. The sealant composition of Embodiment 1, wherein the sealant binder composition comprises a first sealant polymer having a first Tg temperature and a second sealant polymer having a second Tg temperature, wherein the first Tg temperature is less than the second Tg temperature.
Embodiment 3. The sealant composition of Embodiment 1, wherein the sealant binder composition comprises a latex polymer and optionally a non-volatile plasticizer.
Embodiment 4. The sealant composition of Embodiment 1, wherein the glass filler is in the form of glass spheres.
Embodiment 5. The sealant composition of Embodiment 1, wherein the glass filler is a hollow glass filler.
Embodiment 6. The sealant composition of Embodiment 1, wherein the plastic filler is in the form of plastic spheres.
Embodiment 7. The sealant composition of Embodiment 1, wherein the plastic filler is a hollow plastic filler.
Embodiment 8. The sealant composition of Embodiment 1, wherein the sealant composition further comprises a mineral filler.
Embodiment 9. The sealant composition of Embodiment 1, wherein the sealant composition further comprises an auxiliary component selected from the group consisting of rheological additives, organic thickening agents, inorganic thickening agents, adhesion promoters, pigments, dispersants, pigment dispersants, filler dispersants, detergents, non-ionic detergents, cationic detergents, anionic detergents, surfactants, non-ionic surfactants, cationic surfactants, anionic surfactants, biocides, mildew growth inhibitors, plasticizers, oils, process oils, freeze-thaw additives, volatile freeze-thaw additives, non-volatile freeze-thaw additives, pH modifiers, volatile pH modifiers, non-volatile pH modifiers, buffers, and combinations thereof.
Embodiment 10. The sealant composition of Embodiment 1, wherein the sealant composition exhibits a volume shrinkage less than about 30% upon drying.
Embodiment 11. A method of making a sealant composition comprising:
Embodiment 12. The method of Embodiment 11, wherein the sealant binder composition comprises a first sealant polymer having a first Tg temperature and a second sealant polymer having a second Tg temperature, wherein the first Tg temperature is less than the second Tg temperature.
Embodiment 13. The method of Embodiment 11, wherein the sealant composition further comprises an auxiliary component selected from the group consisting of rheological additives, organic thickening agents, inorganic thickening agents, adhesion promoters, pigments, dispersants, pigment dispersants, filler dispersants, detergents, non-ionic detergents, cationic detergents, anionic detergents, surfactants, non-ionic surfactants, cationic surfactants, anionic surfactants, biocides, mildew growth inhibitors, plasticizers, oils, process oils, freeze-thaw additives, volatile freeze-thaw additives, non-volatile freeze-thaw additives, pH modifiers, volatile pH modifiers, non-volatile pH modifiers, buffers, and combinations thereof.
Embodiment 14. The method of Embodiment 11, wherein the sealant composition exhibits a volume shrinkage less than about 30% upon drying.
Embodiment 15. A method of using a sealant composition comprising:
Embodiment 16. The method of Embodiment 15, wherein the work surface is selected from the group consisting of a surface in a building and/or construction application, a surface in an interior trim work application, a wall, a floor, a ceiling, a door, a window, a gap therebetween, and combinations thereof
Embodiment 17. The method of Embodiment 15, wherein the work surface comprises a material selected from the group consisting of glass, ceramic tile, porcelain tile, ceramic and porcelain tile, concrete, aluminum, plastic, polyvinyl chloride (PVC), wood, drywall, and combinations thereof.
Embodiment 18. The method of Embodiment 15, wherein the sealant binder composition comprises a first sealant polymer having a first Tg temperature and a second sealant polymer having a second Tg temperature, wherein the first Tg temperature is less than the second Tg temperature.
Embodiment 19. The method of Embodiment 15, wherein the sealant composition further comprises an auxiliary component selected from the group consisting of rheological additives, organic thickening agents, inorganic thickening agents, adhesion promoters, pigments, dispersants, pigment dispersants, filler dispersants, detergents, non-ionic detergents, cationic detergents, anionic detergents, surfactants, non-ionic surfactants, cationic surfactants, anionic surfactants, biocides, mildew growth inhibitors, plasticizers, oils, process oils, freeze-thaw additives, volatile freeze-thaw additives, non-volatile freeze-thaw additives, pH modifiers, volatile pH modifiers, non-volatile pH modifiers, buffers, and combinations thereof.
Embodiment 20. The method of Embodiment 15, wherein the sealant composition exhibits a volume shrinkage less than about 30% upon drying.
Without further elaboration, it is believed that one skilled in the art using the preceding description can utilize the present invention to its fullest extent. The following Examples are, therefore, to be construed as merely illustrative, and not limiting of the disclosure in any way whatsoever.
The following compositions are select inventive compositions in accordance with the present disclosure.
An ASTM C834 observation was made for an ASTM C1241 volume shrinkage test because ASTM C1241 is not a method for measuring actual observed shrinkage of a sealant within a gap.
This method utilizes a sample weight % solids of fully cured sealant and tested density of fresh (wet) sealant.
Example Calculations:
[sealant density (lbs/gal)/density of water (lbs/gal)]×[100−Wt Solids %/density of water at 23C (g/ml)]
[8.11/8.32]×[(100−0.8627)/0.9976)]=13.4% volume shrinkage
Low-shrink sealant compositions in accordance with the present disclosure generally range from 13- 14% volume shrinkage, calculated as above. In contrast, comparative conventional painter's grade latex sealants range between 26 - 29% volume shrinkage, calculated as above.
Notably, this method does not take into account any internal/structural resistance to shrinkage inherent to the formulation resulting from spherical filler packing arrangements.
In addition, an alternative shrinkage test method was developed. A demonstration of the test method is shown in
In this method, a physical measurement (using a micrometer or tire tread depth gauge) was made of sinking of sealant below the surface of wooden channels 0.25″ deep, 0.5″ wide by 5″ in length. This method quantitatively characterizes visual observations in the channel after the sealant fully cures.
Measurements made with this test method are shown in
Example Calculations:
((1.6 mm×0.03937)×0.25″)/(0.5″×0.25″)×100=12.6% volume shrinkage
Low-shrink sealant compositions in accordance with the present disclosure generally range from 12- 13% volume shrinkage, calculated as above. In contrast, comparative conventional latex sealants range between 25-28% volume shrinkage, calculated as above.
Notably, this method does take into account internal/structural resistance to shrinkage inherent to the formulation resulting from spherical filler packing arrangements.
In addition, an alternative shrinkage test method was developed. A demonstration of the test method is shown in
The method is generally described as follows. The test method is based on displacement of water by cured sealant within a known (pre-calibrated) petri dish volume. First, the weight and/or volume of the petri dish is calibrated with water. Second, the sealant sample cures, thereby shrinking down into the petri dish. Third, water is placed over the cured sealant before a glass plate is applied. Fourth, the water under the glass plate (no air bubbles) fills the void above the sealant and top of the petri dish. The system is then weighed to calculate volume loss.
The method is specifically described as follows. Sealant of known wet density is filled into a pre-weighed plastic petri dish (e.g. roughly 3.5 cm diameter×1 cm deep) and the weight of wet sealant filled into the dish is recorded. Before filling dish with sealant, the dish is calibrated by filling with deionized water. A glass plate is placed on top to confine the water to the full volume of the dish, avoid any bubbles and remove excess spilled water from the balance. The weight is recorded within 0.01g. The sealant should be filled to 80-90% “full” (avoiding air pockets) inside the dish but flush with surface is not necessary. The sealant in the dish is allowed to cure and shrink down further inside the dish for 2 weeks minimum or accelerated in a drying oven at 50C for 5 days. After the necessary drying time, the sealant and dish are weighed on a balance (at least to the nearest 0.01 g). From the original weight of the empty dish subtracted from the total dish+dried sample weight, a % solids of the sealant can be calculated to verify proper dry time.
The % solids can be used to calculate volume theoretical volume shrinkage as in the ASTM C1241 test (though a petri dish is not used in the method as written). After recording the weight of the dish+dried sealant, this is re-weighed a smooth glass plate is placed on the same balance together, and the balance is zeroed out. Deionized water with approximate density of 1 g/cc at room temperature is filled over the sealant to slightly above the edge of the dish. The glass plate is carefully placed on the surface, with the excess water squeezed out so that there are no bubbles underneath the plate, and water overflow is removed from off the balance.
A successful test assumes the sealant will not absorb measurable water in the short time the test is being conducted, and the weight of water recorded is all within the total volume of free space between the surface of the cured sealant and the bottom of the glass plate.
Example Calculations:
Extending from the above example calculations, [(3.09 g water added to top of cured sealant in dish−(C−B)]/ B×100=11.26% volume shrinkage.
Or, {3.09 g (water added to top of cured sealant in dish)−[7.71 g (water for calibration of dish)−5.07 g (wet sealant filled into dish)/A]}/(5.07 g/A)×100=11.26% volume shrinkage.
Low-shrink sealant compositions in accordance with the present disclosure generally range from 11- 12% volume shrinkage, calculated as above. In contrast, comparative conventional latex sealants range between 23- 27% volume shrinkage, calculated as above.
The measurement method of this example also takes into account internal/structural resistance to shrinkage inherent to the formulation resulting from spherical filler packing arrangements, and is more accurate than the “channel” method.
Shrinkage was tested according to the methods of the present disclosure. Results are shown in Table 2.
Paint-ready time is reduced substantially (up to 50% relative to other formulations) while also minimizing the possibility of paint film cracking, which often occurs when sealants with high volume shrinkage are painted too soon or with poor quality paint.
The elongations and tensile properties for inventive and comparative compositions were analyzed.
Analysis according to ASTM C734 is shown in
Analysis according to ASTM C736 is shown in
Analysis according to ASTM D-412 is shown in
In summary, sealant compositions have substantial benefits have been developed. The sealant compositions are low shrinkage latex sealants that exhibit under 10% volume shrinkage by some test methods. The compositions pass complete ASTM C834 testing. The compositions also exhibit 10-minute paint-ready time and have excellent application properties.
This written description uses examples to illustrate the present disclosure, including the best mode, and also to enable any person skilled in the art to practice the disclosure, including making and using any compositions or systems and performing any incorporated methods. The patentable scope of the disclosure is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have elements that do not differ from the literal language of the claims, or if they include equivalent elements with insubstantial differences from the literal language of the claims.
As used herein, the terms “comprises,” “comprising,” “includes,” “including,” “has,” “having,” “contains”, “containing,” “characterized by” or any other variation thereof, are intended to cover a non-exclusive inclusion, subject to any limitation explicitly indicated. For example, a composition, mixture, process or method that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, mixture, process or method.
The transitional phrase “consisting of” excludes any element, step, or ingredient not specified. If in the claim, such would close the claim to the inclusion of materials other than those recited except for impurities ordinarily associated therewith. When the phrase “consisting of” appears in a clause of the body of a claim, rather than immediately following the preamble, it limits only the element set forth in that clause; other elements are not excluded from the claim as a whole.
The transitional phrase “consisting essentially of” is used to define a composition or method that includes materials, steps, features, components, or elements, in addition to those literally disclosed, provided that these additional materials, steps, features, components, or elements do not materially affect the basic and novel characteristic(s) of the claimed invention. The term “consisting essentially of” occupies a middle ground between “comprising” and “consisting of”.
Where an invention or a portion thereof is defined with an open-ended term such as “comprising,” it should be readily understood that (unless otherwise stated) the description should be interpreted to also describe such an invention using the terms “consisting essentially of” or “consisting of”
Further, unless expressly stated to the contrary, “or” refers to an inclusive or and not to an exclusive or. For example, a condition A or B is satisfied by any one of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present).
Also, the indefinite articles “a” and “an” preceding an element or component of the invention are intended to be nonrestrictive regarding the number of instances (i.e. occurrences) of the element or component. Therefore “a” or “an” should be read to include one or at least one, and the singular word form of the element or component also includes the plural unless the number is obviously meant to be singular.
As used herein, the term “about” means plus or minus 10% of the value.
As used herein, Tg temperature refers to the glass transition temperature, which is the temperature at or above which a material transitions from a relatively hard and brittle “glassy” state into a relatively viscous or rubbery state.
This application claims priority to U.S. Provisional Application Ser. No. 63/247,089, filed on Sep. 22, 2021, the contents of which are hereby incorporated by reference in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| 63247089 | Sep 2021 | US |
