Patent ID: 6433048
Filing Date: 2002-08-13
Classification: C08F,Y10S

Abstract:
Acrylic polymer fine particles which consist essentially of primary particles P having a core-shell structure consisting essentially of a core polymer C and a shell polymer S, wherein the average particle diameter of the primary particles P is not less than 250 nm, the core polymer C and the shell polymer S being copolymers of the following monomer mixtures Mc and Ms, respectively, and wherein the weight ratio of Mc and Ms is 10/90-90/10;Mc: methyl methacrylate 20-85 mol % (meth)acrylic ester of C2-C8 aliphatic alcohol or aromatic alcohol or both 15-80 mol %, and and other copolymerizable monomers not more than 30 mol %, where the total amount of these monomers is 100 mol %; Ms: methyl methacrylate 20-79.5 mol %, (meth)acrylic ester of C2-C8 aliphatic alcohol or aromatic alcohol or both 5-40 mol %, monomer containing carboxyl group or sulfonic acid group and other copolymerizable monomers not more than 30 mol %, where the total amount of these monomers is 100 mol%.