Patent ID: 9062132
Filing Date: 2015-06-23
Classification: C08F,C08L

Abstract:
1. A dispersion stabilizer for suspension polymerization, comprising: a polyvinyl alcohol polymer (A) having a saponification degree of 60 mol % or more and a polymerization degree of 200 or more, and a polyvinyl alcohol polymer (C) obtained by esterifying a polyvinyl alcohol polymer (B) having a saponification degree of less than 60 mol % with a carboxylic acid compound, wherein, by the esterifying, a vinyl ester unit, different from the vinyl ester unit included in polyvinyl alcohol polymer (B), is introduced into the polyvinyl alcohol polymer (B), and wherein an amount of modification with the carboxylic acid compound in the polyvinyl alcohol polymer (C) is 0.01 to 20 mol %, based on all monomer units in the polyvinyl alcohol polymer (C).