Process for producing binary or ternary graft-copolymer

Claim 1

A PROCESS FOR PRODUCING A BINARY OR TERNARY GRAFTCOPOLYMER CONSISTING ESSENTIALLY OF AN ETHYLENE-PROPYLENE RUBBER AND AN AROMATIC VINYL COMPOUND OR OF AN ETHYLENEPROPYLENE RUBBER, AN AROMATIC VINYL COMPOUND AND A VINYL CYANIDE COMPOUND, THE ETHYLENE-PROPYLENE RUBBER COMPRISING ETHYLENE AND PROPYLENE IN A MOLAR RATIO OF 5:1 TO 1:2 AND BEING SELECTED FROM THE GROUP CONSISTING OF TWO-COMPONENT POLYMER COMPRISING ETHYLENE AND PROPYLENE AND ETHYLENEPROPYLENE-DIENE TERPOLYMER CONTAINING AS A THIRD COMPONENT A DIENE SELECTED FROM THE GROUP CONSISTING OF DICYCLOPENTADIENE, ETHYLIDENENORBORENE, 1,4-HEXADIENE, 1,3CYCLOOCTADIENE, 1,5-HEXADIENE, 1,7-OCTADIENE OR 1,4PENTADIENE AND A PROPORTION OF THE DIENE COMPONENT BEING 4 TO 50 IN TERMS OF IODINE VALUE, THE AROMATIC VINYL COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF STYRENE, AMETHYLSTYRENE, A-CHLOROSTYRENE, AND DIMETHYLSTYRENE, AND THE VINYL CYANIDE COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE AND METHACRYLONITRILE, WHICH COMPRISES SUBJECTING THESE MATERIALS TO SOLUTION POLYMERIZATION IN THE PRESENCE OF A RADICAL CATALYST AT A TEMPERATURE OF 50* TO 120*C FOR 5 TO 25 HOURS IN A MIXED SOLVENT COMPRISING 5 TO 95% BY WEIGHT OF AN ALIPHATIC HYDROCARBON SOLVENT CAPABLE OF DISSOLVING THE ETHYLENE-PROPYLENE RUBBER AND 95 TO 5% BY WEIGHT OF A POLAR SOLVENT CAPABLE OF DISSOLVING A POLY-(AROMATIC VINYL COMPOUND) IN THE CASE OF THE BINARY GRAFT-COPOLYMER OR OF DISSOLVING A COPOLYMER OF THE AROMATIC VINYL COMPOUND AND THE VINYL CYANIDE COMPOUND IN THE CASE OF THE TERNARY GRAFTCOPOLYMER, THE AIPHATIC HYDROCARBON SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF PARAFFINS AND CYCLOPARAFFINS HAVING 5 TO 10 CARBON ATOMS, CYCLOPENTANES HAVING SUBSTITUENT ALKYL GROUPS OF 1 TO 4 CARBON ATOMS, AND CYCLOHEXANES HAVING SUBSTITUENT ALKYL GROUPS OF 1 TO 4 CARBON ATOMS, AND THE POLAR SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF KETONES, ESTERS, ETHER, CHLORINE-SUBSTITUTED ALIPHATIC HYDROCARBONS, NITROGEN-CONTAINING HYDROCARBONS, AND SULFURCONTAINING HYDROCARBONS.