Patent ID: 7199072

Claim:
A process of preparing an mixed catalyst system, comprising: (a) combining a High MFR melt flow ratio Catalyst with an activator and a support to form an activated High MFR catalyst system; and (b) combining (i) a diluent comprising a mineral or silicon oil with the activated High MFR catalyst system to form a first support slurry; followed by combining a Low MFR Catalyst with the first support slurry; or (ii) a diluent comprising a mineral or silicon oil and a Low MFR Catalyst to the activated High MFR catalyst system; wherein the Low MFR Catalyst is combined with the activated supported High MFR Catalyst in the substantial absence of additional activator, wherein the High MFR Catalyst consists essentially of a cyclic bridged metallocene described 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; wherein A is a divalent bridging group comprising a heterocyclic ring comprising from 3 to 6 carbon atoms and one silyl, thus forming a 4 to 7 member divalent ring; M is zirconium or hafnium; wherein n is 1 or 2; and Q is chlorine or fluorine; and wherein the Low MFR Catalyst consists essentially of a bridged metallocene compound described by the following formula R 1 R 2 EL A B MQ n where 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; wherein R 1 and R 2 are C 1 to C 5 alkyls; M is zirconium or hafnium; wherein n is 1 or 2; and Q is chlorine or fluorine.