Production of modified polyolefin

Claim 1

A METHOD OF PRODUCING AN ETHYLENE-MODIFIED POLYPROPYLENE PRODUCT CONTAINING AS AN ESSENTIAL COMPONENT THEREOF MOLECULES IN WHICH A PORTION OF IRREGULAR ETHYLENE-PROPYLENE COPOLYMER IS ATTACHED TO ONE END OF AN ISOTACTIC POLYPROPYLENE POLYMER CHAIN, THE TOTAL AMOUNT OF ETHYLENE UNITS IN SAID PRODUCT BEING IN THE RANGE FROM 1 TO 20% BY WEIGHT AND THE PROPOTION OF ETHYLENE UNITS IN SAID ETHYLENE-PROPYLENE COPOLYMER BEING BETWEEN 20 AND 90% BY WEIGHT, WHICH COMPRISES FIRST HOMOPOLYMERIZING PROPYLENE BY CONTACT WITH A HIGHLY STEREOSPECIFIC ZIEGLER TYPE OLEFIN POLYMERIZATION CATALYST CONSISTING ESSENTIALLY OF A TWO-COMPONENT SYSTEM COMPRISING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE LEFT HAND SUBGROUPS OF GROUPS 4, 5, 6 AND OF GROUP 8 OF THE MENDELEEV PERIODIC TABLE AND A COCATALYST SELECTED FROM ORGANOMETALLIC COMPOUNDS OF METALS FROM GROUPS 1, 2 AND 3 OF THE PERIODIC TABLE, UNTIL THE CONCENTRATION OF SOLID POLYMER PARTICLES IN THE REACTION SLURRY IS AT LEAST ABOUT 80% OF THE DESIRED FINAL CONCENTRATION, THEREAFTER CONTINUING POLYMERIZATION OF THE PRESENCE OF A MIXTURE OF PROPYLENE WITH ETHYLENE WHEREIN THE CONCENTRATION OF PROPYLENE IS IN EXCESS OF ETHYLENE, STOPPING THE POLYMERIZATION REACTION WHEN THE AMOUNT OF POLYMER HAS REACHED THE DESIRED FINAL CONCENTRATION, AND RECOVERING SAID ETHYLENE-MODIFIED POLYPROPYLENE PRODUCT.

Claim 2

A METHOD OF PRODUCING AN ETHYLENE-MODIFIED POLYPROPYLENE PRODUCT CONTAINING AS AN ESSENTIAL COMPONENT THEREOF MOLECULES IN WHICH A PORTION OF IRREGULAR ETHYLENE-PROPYLENE COPOLYMER IS ATTACHED TO ONE END OF AN ISOTACTIC POLYPROPYLENE POLYMER CHAIN, THE TOTAL AMOUNT OF ETHYLENE UNITS IN SAID PRODUCT BEING IN THE RANGE FROM 1 TO 20% BY WEIGHT AND THE PROPOTION OF ETHYLENE UNITS IN SAID ETHYLENE-PROPYLENE COPOLYMER BEING BETWEEN 20 AND 90% BY WEIGHT, WHICH COMPRISES FIRST HOMOPOLYMERIZING PROPYLENE BY CONTACT WITH A HIGHLY STEREOSPECIFIC ZIEGLER TYPE OLEFIN POLYMERIZATION CATALYST CONSISTING ESSENTIALLY OF A TWO-COMPONENT SYSTEM COMPRISING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE LEFT HAND SUBGROUPS OF GROUPS 4, 5, 6 AND OF GROUP 8 OF THE MENDELEEV PERIODIC TABLE AND A COCATALYST SELECTED FROM ORGANOMETALLIC COMPOUNDS OF METALS FROM GROUPS 1, 2 AND 3 OF THE PERIODIC TABLE, UNTIL THE CONCENTRATION OF SOLID POLYMER PARTICLES IN THE REACTION SLURRY IS AT LEAST ABOUT 80% OF THE DESIRED FINAL CONCENTRATION, THEREAFTER CONTINUING POLYMERIZATION OF THE PRESENCE OF A MIXTURE OF PROPYLENE WITH ETHYLENE WHEREIN THE CONCENTRATION OF PROPYLENE IS IN EXCESS OF ETHYLENE, STOPPING THE POLYMERIZATION REACTION WHEN THE AMOUNT OF POLYMER HAS REACHED THE DESIRED FINAL CONCENTRATION, AND RECOVERING SAID ETHYLENE-MODIFIED POLYPROPYLENE PRODUCT.