Non-aqueous slurries used as thickeners and defoamers and method of using slurries in aqueous systems
First Claim
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1. A slurry, adapted to modify the rheology of a latex paint composition, comprising:
- (a) from about 40% to about 45%, based on the total weight of the slurry, of a particulate water-swelling polymer having a molecular weight of about 100,000 to about 20 million;
(b) from about 20% to about 30%, based on the total weight of the slurry, of a water-insoluble organic carrier vehicle which is a non-solvent for the water-swelling polymer;
(c) from about 20% to about 30% of a mineral oil based defoamer, wherein the defoamer is adapted to actively reduce foam in the latex paint composition;
(d) from about 2% to about 4%, based on the total weight of the slurry, of a non-ionic surfactant having an HLB value of about 8-12; and
(e) from about 0.15% to 0.25% based on the total weight of the slurry of a particulate thickening agent.
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Abstract
A low VOC, HAPs free, substantially non-aqueous slurry for use as a rheology modifier in aqueous systems including but not limited to latex paints. The slurry comprises a particulate water-swelling polymer such as hydroxyethyl cellulose, mineral oil carrier liquid, a non-ionic surfactant, a particulate thickening agent, a defoamer, and optionally an amine component.
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Citations
43 Claims
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1. A slurry, adapted to modify the rheology of a latex paint composition, comprising:
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(a) from about 40% to about 45%, based on the total weight of the slurry, of a particulate water-swelling polymer having a molecular weight of about 100,000 to about 20 million;
(b) from about 20% to about 30%, based on the total weight of the slurry, of a water-insoluble organic carrier vehicle which is a non-solvent for the water-swelling polymer;
(c) from about 20% to about 30% of a mineral oil based defoamer, wherein the defoamer is adapted to actively reduce foam in the latex paint composition;
(d) from about 2% to about 4%, based on the total weight of the slurry, of a non-ionic surfactant having an HLB value of about 8-12; and
(e) from about 0.15% to 0.25% based on the total weight of the slurry of a particulate thickening agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A slurry composition comprising:
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(a) from about 40% to about 45% based on the total weight of the slurry of hydroxyethyl cellulose;
(b) from about 20% to about 30% based on the total weight of the slurry of mineral oil;
(c) from about 20% to about 30% based on the total weight of the slurry of a mineral oil based defoamer;
(d) from about 0.15% to about 0.25% based on the total weight of the slurry of fumed silica; and
(e) from about 2% to about 4% based on the total weight of the slurry of a non-ionic surfactant having an HLB value of about 8 to about 10. - View Dependent Claims (10)
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11. A slurry composition for use in thickening a paint formulation comprising:
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(a) polymer particles capable of swelling in the presence of water, wherein said polymer particles are suspended in a hydrocarbon carrier liquid, wherein the hydrocarbon carrier liquid is present in sufficient amounts to coat the polymer particles;
(b) a defoamer composition, said defoamer composition adapted to actively reduce foam when the slurry is in the paint formulation;
(c) fumed silica;
(d) a non-ionic surfactant. - View Dependent Claims (12, 13, 14)
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15. A slurry composition for use in thickening an aqueous system comprising:
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(a) a mixture of water-swelling polymer particles having various average molecular weights dispersed in mineral oil;
(b) a surfactant;
(c) a thickening agent;
(d) a defoamer, wherein the defoamer actively reduces foam in the aqueous system. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A composition adapted to modify the rheological properties of an aqueous system, upon dilution with water, the composition comprising:
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(a) polymer particles which swell in the presence of water;
(b) a water-insoluble, non-oxygenated, liquid carrier which is a non-solvent for said polymer particles;
(c) a non-ionic surfactant present in sufficient amounts to allow said polymer particles to substantially disperse in the aqueous system prior to swelling;
(d) a thickening agent present in amounts sufficient to retard settling of the polymer particles in the composition; and
(e) a defoamer, wherein said defoamer is adapted to be active upon dilution of the composition with water, wherein the polymer particles remain suspended in the liquid carrier during storage. - View Dependent Claims (26, 27, 28, 29, 30)
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31. A composition for thickening a paint formulation, said composition comprising:
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a first particulate hydroxyethyl cellulose having a first average molecular weight;
a second particulate hydroxyethyl cellulose having a second average molecular weight;
a hydrocarbon carrier liquid;
a defoamer composition, wherein said defoamer composition actively reduces foam in the paint formulation;
a surfactant; and
a thickening agent in sufficient amounts to retard stratification of the first and second particulate hydroxyethyl cellulose in the slurry.
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32. A method for thickening a paint formulation, said method comprising the steps of:
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preparing a first slurry comprising;
about 42% by weight of hydroxyethyl cellulose;
about 25% by weight of a paraffinic mineral oil;
about 28% to about 29% by weight of a mineral oil based defoamer;
about 4% by weight of a non-ionic surfactant; and
less than about 1% by weight of fumed silica;
preparing a second slurry comprising;
about 45% by weight of a hydroxyethyl cellulose having a higher molecular weight than the hydroxyethyl cellulose in the first slurry;
about 24% to about 25% by weight of paraffinic mineral oil;
about 26% by weight of a mineral oil based defoamer;
about 4% by weight of a non-ionic surfactant; and
less than about 1% by weight of fumed silica;
adding said first slurry and said second slurry to a paint base. - View Dependent Claims (33, 34, 35)
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36. A method of preparing a slurry for use in thickening a paint formulation, the method comprising the steps of:
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combining particulate hydroxyethyl cellulose, mineral oil, a non-ionic surfactant, fumed silica, and a mineral oil based defoamer;
mixing said hydroxyethyl cellulose, mineral oil, non-ionic surfactant, fumed silica, and defoamer under high shear conditions until a homogeneous slurry is achieved.
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37. A method for thickening a paint formulation, said method comprising:
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preparing at least one slurry comprising a particulate water-swelling polymer, mineral oil, a surfactant, fumed silica, and a defoamer, wherein said defoamer is adapted to actively reduce foam when the slurry is added to the paint formulation and wherein said slurry is capable of being stored without hard settling for at least seven weeks;
preparing a paint base;
adding said slurry to said paint base;
mixing said slurry and said paint base to achieve a homogeneous dispersion. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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Specification