Vinyl acetate binders in an above-critical PVC coatings composition
AssigneesDow Global Technologies LLC, Rohm and Haas Company
InventorsJames C. Bohling, Junyu Chen, Edwin Nungesser, Zhen Qian, Tao Wang
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Abstract
The present invention is an above-critical coating composition comprising an aqueous dispersion of polymer particles, pigment particles, and extender particles wherein the polymer particles comprise from 80 to 99.8 weight percent structural units of vinyl acetate and from 0.1 to 6 weight percent structural units of a phosphorus acid monomer. The composition shows surprisingly improved hiding with increased particle size of the polymer particles.
Claims8
A coating composition comprising an aqueous dispersion of polymer particles, pigment particles, and extender particles wherein the polymer particles comprise, in a single phase and based on the weight of the polymer particles, greater than 80 up to 99.8 weight percent structural units of vinyl acetate;
- from 0.1 to 6 weight percent structural units of a phosphorus-containing acid monomer or a salt thereof;
- and from 0.1 to 2 weight percent structural units of a sulfur-containing acid monomer or a salt thereof;
- wherein the polymer particles have a particle size by dynamic light scattering of from greater than 350 nm to 500 nm, and wherein the coating composition has an above-critical pigment volume concentration, as determined by reflectance, wherein the phosphorus-containing acid monomer or salt thereof is a dihydrogen phosphate esters of an alcohol in which the alcohol contains or is substituted with a polymerizable vinyl or olefinic group.
Dependencies are inferred from the claim text.