Methacrylic chip resistance revised medicine and chip resistance resin constituent

摘要

PURPOSE: To provide a methacrylic impact modifier composed of a specific multilayer structure polymer, having excellent impact strength and capable of keeping excellent optical properties and impact strength even after weathering test and, accordingly, suitable for imparting a hard methacrylic resin, etc., with impact resistance. ;CONSTITUTION: The modifier is a multilayer structure polymer composed of a combination of (A) 10-90 pts.wt. of a soft polymer layer obtained by the polymerization of a mixture of 10-90wt.% of isoprene, 10-90wt.% of a 1-12C alkyl ester of acrylic acid and 0-30wt.% of a copolymerizable unsaturated monomer and (B) 10-90 pts.wt. of a hard polymer layer obtained by the polymerization of a mixture of 50-10wt.% of a 1-4C alkyl ester of methacrylic acid, 0-50wt.% of a copolymerizable unsaturated monomer and 0-50wt.% of a polyfunctional cross-linking monomer and/or a polyfunctional grafting monomer and having an outermost layer consisting of (C) a hard polymer layer obtained by the polymerization of a mixture of 50-100wt.% of a 1-4C alkyl ester of methacrylic acid and 0-50wt.% of a copolymerizable unsaturated monomer.;COPYRIGHT: (C)1994,JPO&Japio