Catalyst and method of broadening polymer molecular weight distribution and increasing polymer tensile impact strength and products made thereof

摘要

A catalyst and method of producing polyolefins having broadened molecular weight distributions and enhanced tensile impact strengths utilizing a silica supported metallocene-alumoxane catalyst system, wherein at least one of the metallocenes has at least one cyclopentadienyl ring being substituted by at least one optionally substituted hydrocarbon substituent having a 2 degrees or 3 degrees carbon atom with which it is covalently bonded to the cyclopentadienyl ring.