PRODUCTION OF STYRENE-BASED COPOLYMER OF MULTI-LAYER STRUCTURE, STYRENE-BASED COPOLYMER OF MULTI-LAYER STRUCTURE AND MOLDING PRODUCT OF STYRENE-BASED COPOLYMER OF MULTI-LAYER STRUCTURE

摘要

PROBLEM TO BE SOLVED: To obtain the subject resin capable of developing excellent weather resistance, luster, etc., especially excellent impact resistance, by subjecting styrene and a specific monomer mixture to emulsion polymerization, similarly subjecting the obtained copolymer to emulsion polymerization and repeating the copolymerization. ;SOLUTION: A monomer mixture comprising (A) 50-99.899 wt.% of styrene and (B) a monomer mixture constituted of a composition consisting of 0-45 wt.% of at least one selected from (i) a 1-8C (meth)acrylic acid ester and (ii) a vinyl cyanide compound, (iii) 0.001-5 wt.% of a polyfunctional monomer and (iv) 0.1-10 wt.% of a compound of formula I or formula II [R is a group of formula III ((n) is an integer of 1-12)] is subjected to emulsion polymerization so as to make the glass transition temperature ≥0°C. The monomer mixture of the next stage is successively added in the presence of the copolymer obtained at the previous stage and polymerized (seed polymerization method) and subjected to emulsion polymerization at five stages in total to give the objective styrene-based copolymer of multi layer structure.;COPYRIGHT: (C)1999,JPO