Process for preparing catalyst system

A process for preparing a catalyst system comprising reacting a polymer bound metallocene with an aluminoxane cocatalyst to form a catalyst system:

• wherein said polymer bound metallocene is prepared by a process comprising reacting a polymer bound ligand and an alkali metal compound containing 1 to 12 carbon atoms to form a metallated polymer bound ligand, and then reacting said metallated polymer bound ligand and a metal halide to form said polymer bound metallocene;
• wherein said polymer bound ligand is prepared by a process comprising reacting a metallated polystyrene and an organohalide compound;
• wherein said polystyrene is metallated with an alkali metal;
• wherein said organohalide compound is represented by the formula XM(R).sub.m wherein X is a halide, M is Si, C, Ge, Sn, P, or N, wherein each R is a hydrocarbyl group independently selected from the group consisting of alkyl, cycloalkyl, aryl, and cyclopentadienyl-type groups containing 1 to 36 carbon atoms, with the proviso that at least one R group is a cyclopentadienyl-type group, wherein said cyclopentadienyl-type groups are cyclopentadienyl, substituted cyclopentadienyl, indenyl, substituted indenyl, fluorenyl, or substituted fluorenyl, wherein the substituents include hydrocarbyl groups containing 1 to 12 carbon atoms, alkoxy groups containing 1 to 12 carbon atoms, or halide, and wherein m is 2or 3;
• wherein said metal halide is represented by the formula ZY.sub.4 ;
• wherein Z is Zr, Hf, Ti, or V;
• and wherein each Y is individually selected from the group consisting of halides, methyl and cyclopentadienyl-type groups containing 5 to 36 carbon atoms, with the proviso that at least three Y groups are selected from halides;
• and
• wherein said aluminoxane contains repeating units of the formula ##STR2## wherein each R.sup.1 is a hydrocarbyl group containing 1-8 carbon atoms and x is 2 to 50.