Invention Grant
US08461276B2 Multi-component catalyst systems and polymerization processes for forming broad composition distribution polymers 有权
多组分催化剂体系和用于形成宽分子量聚合物的聚合方法

Multi-component catalyst systems and polymerization processes for forming broad composition distribution polymers
Abstract:
Propylene polymerization processes, polymers and films formed therefrom are described herein. The propylene polymerization processes generally include contacting propylene and an amount of ethylene with a first metallocene catalyst and a second metallocene catalyst within a polymerization reaction vessel to form a propylene based polymer, wherein the amount is an amount effective to form the propylene based polymer including from about 2 wt. % to about 6 wt. % ethylene, the second metallocene catalyst is capable of incorporating a greater amount of ethylene into the propylene based polymer than the first metallocene catalyst and wherein the first metallocene catalyst is capable of forming a propylene/ethylene random copolymer exhibiting a melting temperature that is greater than that of a propylene/ethylene random copolymer formed from the second metallocene catalyst.
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