Patent ID: 8022005
Filing Date: 2011-09-20
Classification: C08F,Y10S

Abstract:
1. A catalyst system comprising: 1) a catalyst compound represented by the formula Cp 2) an activator comprising one or more heterocyclic heteroatom containing ligands coordinated to an alkyl alumoxane, wherein the activator is a reaction product of one or more alkyl alumoxane and one or more heterocyclic heteroatom containing ligands, wherein the heterocyclic heteroatom containing ligand is represented by: Y is O, S, PH or NH; wherein each substituent X2, X3, X4, X5, X6 and X7 is independently a hydrogen, chlorine, fluorine, iodine or bromine, provided at least one of X2, X3, X4, X5, X6 and X7 is not hydrogen when Y is NH; and wherein: 1) the ratio of the heterocyclic heteroatom containing ligand to aluminum is between about 0.01 and about 10 molar equivalents, 2) the catalyst system is unsupported; 3) the heterocyclic heteroatom containing ligand is mono-substituted or di-substituted; and 4) the catalyst system is able to prepare polypropylene having an Mw of between about 5,000 and 200,000 g/mol in a process consisting essentially of contacting propylene and the catalyst system.