Patent ID: 9062143
Filing Date: 2015-06-23
Classification: C04B,C08F,C08L,D21H,Y10T

Abstract:
1. A water-redispersible polymer powder comprising in copolymerized form a) one or more vinyl aromatic comonomers, b) one or more 1,3-diene comonomers, c) from 0.1 to 15 percent, based on the total comonomer weight, of one or more comonomers selected from the group consisting of ethylenically unsaturated mono- and dicarboxylic acids and their salts, wherein at least 75 percent of the total number of carboxylic acid and salt groups present in the polymer are located at the surface of the polymer particles in the powder and at least 75 percent of the carboxylic acid and salt groups located at the surface of the polymer particles in the powder are present in their salt form having a cation, and d) from 0 to 40 percent, based on the total comonomer weight, of one or more additional comonomers; and the redispersible polymer powder further comprising a partially hydrolyzed polyvinyl alcohol.