Patent ID: 6468936
Filing Date: 2002-10-22
Classification: B01J,C08F

Abstract:
A process for preparing a catalyst system comprising:a) reacting at least one metallocene of the general formula: Râ€³b(CpR4)(CpRâ€²4)MR*vâˆ’2 where Râ€³ is a bridge imparting stereorigidity to the structure of the metallocene by connecting the two cyclopentadienyl rings, b is 0 or 1, Cp is a cyclopentadienyl ring, R and Râ€² are substituents on the cyclopentadienyl rings and can be a hydride or a hydrocarbyl from 1-9 carbon atoms, each R and Râ€² being the same or different, each (CpR4) and (CpRâ€²4) being the same or different, M is a transition metal of a Group IIIB, IVB, VB or VIB metal, R* is a hydride, a halogen or a hydrocarbyl from 1-20 carbon atoms, v is the valence of M with an aluminoxane in a solvent consisting of toluene,b) removing the toluene from the mixture of metallocene and aluminoxane to obtain a solid reaction product; c) grinding the solid reaction product to form a free flowing powder; d) suspending the solid reaction product in mineral oil to obtain a slurry.