Patent ID: 7199072
Filing Date: 2007-04-03
Classification: C08F,Y10S

Abstract:
1. 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 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:  wherein A is a divalent group bound to each of L L 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  where R L wherein the R wherein R M is zirconium or hafnium; wherein n is 1 or 2; and Q is chlorine or fluorine.