Patent ID: 8754177

Claim:
A polymerization process, the polymerization process comprising contacting ethylene and, optionally, at least one C 3 -C 8 alpha olefin comonomer, with an activated mixed catalyst system in a polymerization reactor, wherein the mixed catalyst system comprises: (a) a first catalyst component that comprises a cyclic bridged metallocene catalyst, an activator, and optionally a support; wherein the cyclic bridged metallocene catalyst is represented by the following formula: L A (A)L B MQ n wherein A is a divalent group bound to each of L A and L B ; each of L A and L B are bound to M, and each Q is bound to M; L A and L B are independently selected from the group consisting of cyclopentadienyl ligands and substituted cyclopentadienyl ligands; A is a cyclotetramethylenesilyl group, thus forming a divalent ring; M is zirconium or hafnium; Q is independently chlorine or fluorine; wherein n is 1 or 2; (b) a second catalyst component that comprises a bridged metallocene compound represented by the following formula: R 1 R 2 EL A L B MQ n wherein R 1 and R 2 are each bound to E, and E is bound to each of L A and L B ; each of L A and L B are bound to M, and each Q is bound to M; L A and L B are independently selected from the group consisting of cyclopentadienyl ligands and substituted cyclopentadienyl ligands; wherein the R 1 R 2 E group forms a divalent bridging group, wherein E is silicon or germanium; wherein R 1 and R 2 are independently C 1 to C 5 alkyls; M is zirconium or hafnium; wherein n is 1 or 2; and Q is chlorine or fluorine; wherein the first catalyst component is capable of producing a polymer with a melt flow ratio I 21 /I 2 measured according to ASTM 1238 Conditions E and F at 190° C., of 35 or more and the second catalyst component is capable of producing a polymer with a melt flow ratio of 50 or less; and wherein the activated mixed catalyst system is introduced to the polymerization reactor as a slurry comprising the mixed catalyst system in a mineral oil or silicon oil.