Patent ID: 8383754

Claim:
An olefin polymerization process, the process comprising: contacting a catalyst composition with an olefin monomer and optionally at least one olefin comonomer under polymerization conditions to produce an olefin polymer, wherein the catalyst composition comprises catalyst component I, catalyst component II, and at least one activator-support comprising a solid oxide treated with an electron-withdrawing anion, wherein: catalyst component I comprises at least one ansa-metallocene compound having formula (I): wherein: M A is Ti, Zr, or Hf; X 1A and X 2A are independently F; Cl; Br; I; methyl; benzyl; phenyl; H; BH 4 ; OBR 2 or SO 3 R, wherein R is an alkyl or aryl group having up to 18 carbon atoms; or a hydrocarbyloxide group, a hydrocarbylamino group, or a hydrocarbylsilyl group, any of which having up to 18 carbon atoms; E A is C or Si; R 1A and R 2A are independently H, a hydrocarbyl group having up to 18 carbon atoms, or R 1A and R 2A are connected to a form a cyclic or heterocyclic group having up to 18 carbon atoms, wherein R 1A and R 2A are not aryl groups; R 6A and R 7A are independently H or a hydrocarbyl group having up to 18 carbon atoms; and Cp A is a cyclopentadienyl, indenyl, or fluorenyl group, or a heteroatom-substituted derivative thereof, any substituent on Cp A is independently H or a hydrocarbyl or hydrocarbylsilyl group having up to 36 carbon atoms; and catalyst component II comprises at least one ansa-metallocene compound having formula (II): wherein: M B is Ti, Zr, or Hf; X 1B and X 2B are independently F; Cl; Br; I; methyl; benzyl; phenyl; H; BH 4 ; OBR 2 or SO 3 R, wherein R is an alkyl or aryl group having up to 18 carbon atoms; or a hydrocarbyloxide group, a hydrocarbylamino group, or a hydrocarbylsilyl group, any of which having up to 18 carbon atoms; E B is C or Si; R 1B and R 2B are independently H or a hydrocarbyl group having up to 18 carbon atoms, wherein at least one of R 1B and R 2B is an aryl group having up to 18 carbon atoms; R 6B and R 7B are independently H or a hydrocarbyl group having up to 18 carbon atoms; and Cp B is a cyclopentadienyl, indenyl, or fluorenyl group, or a heteroatom-substituted derivative thereof, any substituent on Cp B is independently H or a hydrocarbyl or hydrocarbylsilyl group having up to 36 carbon atoms.