Patent ID: 6015854
Filing Date: 2000-01-18
Classification: C08F,C08L

Abstract:
An impact copolymer having a melt flow of about 1 to about 100 dg/min comprising an in situ blend of a polypropylene phase and a copolymerized ethylene and propylene rubber phase formed by copolymerizing ethylene and propylene in the presence of a polypropylene phase, whereby the polypropylene phase may contain up to two weight percent of another olefin, the impact copolymer comprising about 3 to about 60 weight percent of rubber phase with an ethylene content of about 75 to about 95 weight percent, a clarifying agent, and the remainder propylene wherein the copolymer has a clarity of greater than about 20% according to ASTM D-1746-92, the copolymer is cracked to a cracking ratio of between about 1.5 to about 2.5, and the flexural modulus of the impact copolymer is more than 90% of the flexural modulus of the same impact copolymer that has not been cracked.