Rubber dispersed copolymer resin

Claim 1

A rubber dispersed copolymer resin composition comprising: (a) a dispersed phase which is formed by the occlusion of a copolymer of a styrene monomer, an acrylonitrile monomer, and a maleimide monomer in a rubber, by the graft-copolymerization of said monomers to said rubber, or by the occlusion of a copolymer of said monomers in said graft copolymer, the crosslinking degree index of the dispersed phase being 4 to 11; and (b) a continuous phase which is formed of a copolymer of an additional portion of said monomers, the reduced viscosity of a 0.5 weight percent solution of the continuous phase forming copolymer in dimethylformamide being 0.5 to 1.0 dl/g at 30° C.; the portion of said copolymer (GCP) which is occluded and grafted in said dispersed phase being 50 to 100 parts by weight based on 100 parts by weight of rubber; said rubber being contained in an amount of 3 to 20 weight percent, said GCP being 1.5 to 20 weight percent and said copolymer in the continuous phase being 95.5 to 60 weight percent, said weight percentages being based on the total weight of said resin composition; wherein the total amount of monomer in both said GCP and said copolymer in the continuous phase is 100 weight percent, said GCP and said copolymer in the continuous phases comprising 30 to 80 weight percent of said styrene monomer, 10 to 50 weight percent of said acrylontrile monomer, 1 to 25 weight percent of said maleimide methacrylic ester monomers and acrylic ester monomers; and said rubber is selected from the group consisting of polybutadiene rubber, acrylonitrile-butadiene copolymer rubber, styrene-butadiene copolymer rubber, acrylic rubber and ethylene-propyrene-diene terpolymer rubber, and is copolymerized after being dissolved in a portion or the whole portion of one or more of the monomers without the use of a rubber latex.