Product and process for preparing rubber containing vinyl crosslinked styrene resin of high impact strength

Claim 1

A PROCESS FOR PREPARING POLYMER COMPOSITIONS HAVING HIGH IMPACT STRENGTH WHICH CONSIST OF MIXING (1) FROM 5% TO 30% BY WEIGHT, BASED ON THE WEIGHT OF THE HEREINAFTER DESCRIBED SOLID POLYMER OF AN ALKENYL-SUBSTITUTED AROMATIC COMPOUND, OF A SYNTHETIC RUBBER POSSESSING ETHYLENIC UNSATURATED AND SELECTED FROM THE GROUP CONSISTING OF RUBBERY POLYMERS OF BUTADIENE, RUBBERY POLYMERS OF CHLOROPRENE AND RUBBERY POLYMERS OF ISOBUTYLENE, WITH (2) A SOLID POLYMER SELECTED FROM THE GROUP CONSISTING OF (A) HOMOPOLYMERS OF ALKENYL-SUBSTITUTED AROMATIC COMPOUNDS WHEREIN THE ALKENYL GROUP IS ATTACHED THROUGH A CARBON ATOM TO A CARBON ATOM OF THE AROMATIC RING, AND (B) COPOLYMERS OF SAID ALKENYL-SUBSTITUTED AROMATIC COMPOUND AND DISSIMILAR COMPOUND POSSESSING A SINGLE CH2=C= GROUP, AND SELECTED FROM THE GROUP CONSISTING OF UNSATURATED NITRILES, VINYL HALIDE AND LOWER ALKYL ACRYLATES, SAID COPOLYMER CONTAINING AT LEAST 80% BY WEIGHT OF THE UNITS OF THE ALKENYL-SUBSTITUTED AROMATIC COMPOUND, CONTINUING THE MIXING UNTIL A SOLID INTIMATE PHYSICAL MIXTURE OF THE SYNTHETIC RUBBER AND THE POLYMER OF THE ALKENYL-SUBSTITUTED AROMATIC COMPOUND IS OBTAINED, AND THEN ADDING TO SAID SOLID INTIMATE MIXTURE FROM 0.1% TO 10% BY WEIGHT, BASED ON THE WEIGHT OF THE SYNTHETIC RUBBER, OF AN ETHYLENICALLY UNSATURATED MONOMER HAVING A TERMINAL CH2=C= GROUP AND SELECTED FROM THE GROUP CONSISTING OF ESTERS OF ETHYLENICALLY UNSATURATED MONOHYDRIC ALCOHOLS AND MONOCARBOXYLIC ACIDS, ESTERS OF ETHYLENICALLY UNSATURATED MONOHYDRIC ALCOHOLS AND DICARBOXYLIC ACIDS, ALKENYL-SUBSTITUTED AROMATIC HYDROCARBONS, ALKENYL ALKYL ETHERS, DIALKENYL ETHERS, ALKENYL ALKYL KETONES, DIALKENYL KETONES AND ETHYLENICALLY UNSATURATED NITRILES, AND A PEROXIDE POLYMERIZATION CATALYST, AND CONTINUING THE SAID MIXING AT A TEMPERATURE BETWEEN 90*C. AND 208*C. TO PERMIT CHEMICAL CROSS-LINKING BY SAID MONOMER TO OCCUR WITHIN THE RESULTING MIXTURE