Patent ID: 8268944
Filing Date: 2012-09-18
Classification: C08F,Y10S

Abstract:
1. A method of polymerizing olefins, comprising: contacting an olefin monomer and an optional α-olefin comonomer with a catalyst composition under polymerization conditions to form a polymer or copolymer; wherein the catalyst composition comprises a contact product of: a) at least one first metallocene; b) at least one second metallocene; c) optionally, at least one organoaluminum compound; and d) at least one activator, wherein: a) the at least one first metallocene comprises an ansa-metallocene having the formula: b) the at least one second metallocene comprises an unbridged metallocene having the formula: or c) the at least one organoaluminum compound comprises a trialkylaluminum compound, a dialkylaluminum halide compound, a dialkylaluminum alkoxide compound, a dialkylaluminum hydride compound, or any combination thereof; and d) the at least one activator comprises an organoaluminoxane compound, an organoboron or organoborate compound, or any combination thereof; wherein the at least one organoaluminum compound is optional when at least one of the following conditions exist: 1) a) at least one of (X 2) the catalyst composition comprises at least one organoaluminoxane compound; or 3) both conditions 1 and 2 exist.