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US 5,962,580 AGranted
Method for providing a waterborne coating composition with improved color acceptance
AssigneeRohm and Haas Company
InventorsAsare Nkansah, Robert David Solomon, Stewart Orlyn Williams
Life of this patent
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Abstract
A method for providing a waterborne coating composition having improved color acceptance is provided. More particularly, a method for improving the color acceptance of a waterborne coating composition containing an emulsion-polymerized addition polymer by incorporating a polymerizable surfactant into the polymer with a certain surface coverage of bound surfactant is provided.
Claims3
A method for providing a waterborne coating composition having improved color acceptance comprising
- forming a waterborne coating composition, said composition comprising at least one pigment and at least one emulsion-polymerizegd addition polymer having a glass transition temperature from -30.degree. C. to 50.degree. C., said addition polymer being formed from at least one ethylenically unsaturated monomer and from 0.1% to 5%, by weight based on the weight of said addition polymer, of one copolymerizable surfactant monomer selected from the group consisting of ethylenically unsaturated polyalkoxylate sulfates and ethylenically unsaturated sulfosuccinates, said addition polymer having surface coverage of bound surfactant from 300 sq. Angstroms/surfactant molecule to 1000 sq. Angstroms/surfactant molecule, said surface coverage of said emulsion-polymerized addition polymer being determined from the polymer particle surface area via measurement at the particle size of said emulsion-polymerized addition polymer and amount of bound surfactant via centrifugation of said emulsion-polymerized addition polymer;
- and
- admixing at least one predispersed colored pigment.
Dependencies are inferred from the claim text.