Process for producing thermoplastic resins

Claim 1

IN A PROCESS FOR PRODUCING A GRAFT COPOLYMER WHICH COMTHERMOPLASTIC RESIN CONSISTING OF AN ETHYLENE-PROPYLENE RUBBER AND AN AROMATIC VINYL COMPOUND OR OF AN ETHYLENE-PROPYLENE RUBBER AN AROMATIC VINYL COMPOUND AND A VINYL CYANIDE COMPOUND BY USING A RADICAL CATALYST THE IMPROVEMENT WHICH COMPRISES SUBJECTING THESE MATERIALS TO SOLUTION POLYMERIZATION AT A TEMPERATURE OF 30* TO 120*C FOR 5 TO 40 HOURS IN A MIXED SOLVENT CCONSISTING OF 95 TO 5% BY WEIGHT OF AT LEAST ONE AROMATIC HYDROCARBON SOLVENT CAPABLE OF DISSOLVING THE ETHYLENE PROPYLENE RUBBER AND 5 TO 95% BY WEIGHT OF AT LAST ONE POLAR SOLVENT CAPABLE OF DISSOLVING POLY (AROMATIC VINYL COMPOUND) IN THE CASE OF THE GRAFTCOPOLYMER OR AROMATIC VINYL COMPOUND-VINYL CYANIDE COMPOUND COPOLYMER IN THE ASE OF THE GRAFT-TERPOLYMER THE AROMATIC HYDRCARBON SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF BENZENE TOLUENE DIMETHYLBENZENE XYLENE ETHYLBENZENE DIETHYLBENEZENE AND TRIETHYLBENZENE THE POLAR SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF KETONES ESTERS ETHERS CHLORINE-SUBSTITUTED ALIPHATIC HYDROCARBONS NITROGEN CONTAINING HYDROCARBONS AND SULFUR-CONTAINING HYDROCARBONS THE ETHYLENE-PROPYLENE RUBBER COMPRISING ETHYLENE AND PRPYLENE IN A MOLAR RATIO OF FROM 5.1 TO 1,3 AND BEING SELECTED FROM THE GROUP CONSISTING OF TWO-COMPONENT POLYMER COMPRISING ETHYLENE AND PROPYLENE AND ETHYLENE-PROPYLENE-DIENE TERPOLYMER CONTAINING AS THE THIRD COMPONENT A DIENE SELECTED FROM THE GROUP CONSISTING OF DICYCLOPENTADIENE ETHYLIDENENORBORNENE 1,4-HEXIDIENE, 1-5-HEXADIENE, 2-METHYL-1, 5-HEXADIENE, 1,4CYCLOHEPTADIENE, 1,5-CYCLOOCTADIENE AND MIXTURES THEREOF AND HAVING AN IODINE VALUE OF 4 TO 50, THE AROMATIC VINYL COMPONENT BEING SELECTED FROM THE GROUP CONSISTING OF STYRENE, A-METHYLSTYRENE, A-CHLOROSTYRENE AND DIEMTHYLSTYRENE, AND THE VINYL CYANIDE COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE AND METHACRYLONITRILE.