Process for the preparation impact resistant styrene polymers

Claim 1

PROCESS FOR THE PREPARATION OF IMPACT RESISTANT STYRENE GRAFT COPOLYMERS BY POLYMERIZATION OF A. 98 TO 80 PERCENT BY WEIGHT OF A MIXTURE OF AA. 90 TO 70 PERCENT BY WEIGHT OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE, VINYL TOLUENE, VINYL XYLENE, CHLORO-STYRENE, BROMO-STYRENE, VINYLCYCLOHEXANE, METHYLVINYLCYCLOHEXANE AND HALOGENVINYL CYCLOHEXANE WITH AB. 10 TO 30 PERCENT BY WEIGHT OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE, METHACRYLONITRILE, A LOW ALIPHATIC ALCOHOL ESTER OF ACRYLIC ACID, METHACRYLIC ACID, ITACONIC ACID, MALEIC ACID, AND FUMARIC ACID IN ADMIXTURE WITH B. 2 TO 20 PERCENT BY WEIGHT OF AN ETHYLENEPROPYLENE-TERCOMPONENT-RUBBER, (AA) AND (AB) BEING CALCULATED, IN PERCENT BY WEIGHT, ON THE TOTAL QUANTITY OF THE MONOMERS (AA) + (AB) AND (A) AND (B) ON THE TOTAL QUANTITY OF MONOMERS A) $(=AA) + (AB) + RUBBER (B), IN THE PRESENCE OF AT LEAST ONE MONOMER SOLUBLE, ORGANIC PEROXIDE IN THE MASS OR IN MASS/SUSPENSION, WHEREIN THE MIXTURE OF (AA) AND (AB) WITH (B) IS POLYMERIZED, AFTER DISSOLVING THE ETHYLENE-PROPYLENE-TER-COMPONENT-RUBBER IN AT LEAST ONE MEMBER OF SAID GROUP RECITED IN (AA), AND THEREAFTER ADDING AT LEAST ONE MEMBER OF SAID GROUP RECITED IN (AB) WITHIN AN (AA) / (AB) RATIO, IN PERCENT BY WEIGHT, OF 6/1 TO 4// AT A TEMPERATURE OF 85* TO 115*C, UNTIL THE END OF THE PHASE TRANSITION, AND THE POLYMERIZATION IS COMPLETED AFTER A FURTHER ADDITION OF I. AT LEAST ONE MONOMER FROM THE GROUP CONSISTING OF MONOMERS, RECITED IN (AA) OR (AB) OR II. A MIXTURE OF (AA) AND (AB) FOR THE POLYMERIZATION MASS TO FALL WITHIN THE RECITED RATIO OF AA) TO AB).