Patent ID: 8318873

Claim:
A process for polymerizing olefins, the process comprising: contacting a catalyst composition with an olefin monomer and optionally an olefin comonomer under polymerization conditions to produce a polymer, wherein the catalyst composition comprises a first metallocene compound, a second metallocene compound, an activator-support, and an organoaluminum compound, wherein: (a) the first metallocene compound has the formula: (X 1 )(X 2 R 1 2 )(X 3 )(X 4 )M 1 ; wherein: (X 1 ) is cyclopentadienyl, indenyl, or fluorenyl; (X 2 ) is fluorenyl; (X 1 ) and (X 2 ) are connected by a disubstituted bridging group comprising one atom bonded to both (X 1 ) and (X 2 ), wherein the atom is carbon or silicon; a first substituent of the disubstituted bridging group is an aliphatic or aromatic group having from 1 to about 10 carbon atoms; a second substituent of the disubstituted bridging group is a saturated or unsaturated aliphatic group having from 3 to about 10 carbon atoms; R 1 is H or an alkyl group having from 1 to about 4 carbon atoms; (X 3 ) and (X 4 ) independently are a halide; and M 1 is Zr or Hf; (b) the second metallocene has the formula: R 2 is H or —CH 3 ; R 3 is CH 2 ═CHCH 2 —, CH 2 ═CH(CH 2 ) 2 —, Ph(CH 2 ) 3 —, CH 3 (CH 2 —) 3 , or H; X 5 and X 6 independently are a halide; and M 2 is Zr or Hf; and (c) the activator-support comprises a solid oxide treated with an electron-withdrawing anion, wherein: the solid oxide is silica, alumina, silica-alumina, aluminum phosphate, heteropolytungstate, titania, zirconia, magnesia, boria, zinc oxide, any mixed oxides thereof, or any mixture thereof; and the electron-withdrawing anion is fluoride, chloride, bromide, phosphate, triflate, bisulfate, sulfate, or any combination thereof.