Patent ID: 6187880
Filing Date: 2001-02-13
Classification: C08F

Abstract:
A process for producing a polymer comprising contacting at least one olefin under suitable reaction conditions with a solid catalyst system prepared by combining a metallocene with a solution of an organo aluminoxane cocatalyst and conducting prepolymerization to produce a prepolymerized solid, then washing the solid to remove soluble components and recovering the solid catalyst system, said metallocene being selected from those of the formula R(Z)(Z)MQ.sub.k wherein each Z is bound to M and is the same or different and is a cyclodienyl-type ligand selected from substituted or unsubstituted cyclopentadienyl, indenyl, tetrahydroindenyl, octahydrofluorenyl, and fluorenyl ligands; R is a structural bridge linking the Z's which is a single carbon atom connecting the Z's, wherein the other valences of the bridging carbon are satisfied by a terminally unsaturated hydrocarbyl substituent and by an aryl group, and M is a metal selected from the group consisting of IVB, VB, and VIB metals of the periodic table, each Q is the same or different and is selected from the group consisting of hydrogen, halogens, and hydrocarbyl or hydrocarboxyl radicals having 1 to 20 carbon atoms; k is a number sufficient to fill out the remaining valences of M.