Processes for preparing aqueous polymer emulsions
AssigneeUnion Carbide Chemical & Plastics Technology Corporation
InventorsRichard D. Jenkins, David R. Bassett, Ralph A. Sterlen, Jr., Wendy B. Daniels
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Abstract
This invention relates to processes for preparing aqueous polymer emulsions useful as thickening agents in aqueous compositions in which plating and/or grit formation is reduced in said processes. This invention also relates to methods for reducing plating and/or grit formation in processes for preparing aqueous polymer emulsions useful as thickening agents in aqueous compositions. This invention further relates to polymers which are soluble in, or swelled by, an aqueous alkaline medium to provide thickeners for use in aqueous coating compositions, especially latex paints.
Claims19
A process for preparing an aqueous polymer emulsion useful as a thickening agent in aqueous compositions in which plating and/or grit formation is reduced in said process, which comprises copolymerizing in aqueous emulsion:
- (a) about 1-99.8 weight percent of one or more alpha, beta-monoethylenically unsaturated carboxylic acids;
- (b) about 0-98.8 weight percent of one or more monoethylenically unsaturated monomers different from component (a);
- (c) about 0.1-98.9 weight percent of one or more monoethylenically unsaturated macromonomers different from components (a) and (b);
- (d) about 0-20 weight percent or greater of one or more polyethylenically unsaturated monomers different from components (a), (b) and (c);
- and
- (e) one or more acrylate s and/or methacrylates derived from a strong acid or a salt of a strong acid different from components (a), (b), (c) and (d) in an amount sufficient to reduce plating and/or grit formation in said process, said strong acid comprising an acid filly dissociated at a pH of 2.
Dependencies are inferred from the claim text.