Polymerization process for producing bimodal polymers

A catalyst composition comprising a first metallocene compound, a second metallocene compound, and a co-catalyst, wherein:

• (a) the first metallocene compound has the formula:
• (X1)(X2R12)(X3)(X4)M1;
• wherein:
• (X1) is cyclopentadienyl, indenyl, or fluorenyl;
• (X2) is fluorenyl;
• (X1) and (X2) are connected by a disubstituted bridging group comprising one atom bonded to both (X1) and (X2), 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;
• R1 is H or an alkyl group having from 1 to about 4 carbon atoms;
• (X3) and (X4) independently are a halide;
• and
• M1 is Zr or Hf;
• and
• (b) the second metallocene has the formula:
• wherein:
• R2 is H or —CH3;
• R3 is CH2═CHCH2—, CH2═CH(CH2)2—, Ph(CH2)3—, CH3(CH2—)3, or H;
• X5 and X6 independently are a halide;
• and
• M2 is Zr or Hf.