Process for preparing blends of polypropylene with copolymers of ethylene and propylene

Claim 1

THE PROCESS OF PREPARING BLENDS OF POLYPROPYLENE WITH COPOLYMERS OF ETHYLENE AND PROPYLENE WHICH COMPRISES COPOLYMERIZING ETHYLENE AND PROPYLENE BY INTRODUCING BOTH ETHYLENE AND PROPYLENE SIMULTANEOUSLY INTO AN INERT LIQUID ORGANIC DILUENT IN THE PRESENCE OF A CATALYST COMPRISING A COMBINATION OF A COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF METALS OF GROUPS IV-B, V-B, VI-B, AND VIII OF THE PERIODIC TABLE AND MANGANESE, AND A HYDROCARBON METAL COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS, ALKALINE EARTH METALS, AND ALUMINUM TO FORM A REACTION SLURRRY CONTAINING A SOLID COPOLYMER OF 97 TO 85 MOLE PERCENT ETHYLENE AND 3 TO 15 MOLE PERCENT PROPYLENE, DISCONTINUING THE INTRODUCTION OF ETHYLENE, THEREAFTER HOMOPOLYMERIZING PROPYLENE IN THE SAME DILUENT IN THE PRESENCE OF THE ALREADY FORMED COPOLYMER BY INTRODUCING PROPYLENE INTO THE REACTION SLURRY IN THE PRESENCE OF SAID CATALYST, EACH OF SAID COPOLYMERIZATION AND HOMOPOLYMERIZATION STEPS BEING CONDUCTED FOR A TIME SUFFICIENT TO PRODUCE A REACTION SLURRY IN WHICH SAID COPOLYMER COM PRISES ABOUT 10 TO 60* BY WEIGHT OF THE TOTAL POLYMER AND IN WHICH THE TOTAL POLYMER AMOUNTS TO AT LEAST 150 GRAMS PER LITER OF DILUENT, AND SEPARATING FROM THE FINAL REACTION SLURRY A BLEND OF STEREOREGULAR POLYPROPYLENE AND SAID COPOLYMER.