Patent ID: 6486234
Filing Date: 2002-11-26
Classification: C08F,C08L

Abstract:
An impact strength modifier comprising, as a principal component, an acrylic rubber graft copolymer which is obtained by graft polymerization of a polyalkyl (meth)acrylate rubber (A) with one or more vinyl monomers (B),said polyalkyl (meth)acrylate rubber (A) comprising, as a principal component, an acrylic rubber (A1) component containing at least one of (a) a (meth)acrylate of an alcohol having a branched side chain,(b) a (meth)acrylate of an alcohol having an alkyl group with 13 or more carbon atoms, and (c) a (meth)acrylate having a hydroxyl group, a methoxy group or an ethoxy group as a constituent component, and an acrylic rubber (A2) component containing n-butyl acrylate as a constituent component, wherein acrylic rubber (A1) is different from acrylic rubber (A2), and wherein said acrylic rubber graft copolymer is obtained by graft polymerization of said polyalkyl (meth)acrylate rubber (A), which is obtained by polymerizing a monomer containing n-butyl acrylate constituting said acrylic rubber (A2) component in the presence of said acrylic rubber (A1) component obtained by emulsion polymerization, and one or more vinyl monomers (B), wherein the number distribution of the particle size of said polyalkyl (meth)acrylate rubber (A) is a distribution having at least two peaks within a range from 0.05 to 0.4 &mgr;m and not less than 70% by weight of said polyalkyl (meth)acrylate rubber (A) consists of particles having a particle size within a range from 0.05 to 0.4 &mgr;m.