Metallocene catalysts, their synthesis and their use for the polymerization of olefins

Abstract

A process for the preparation of a catalyst system includes the steps of combining a support material with a first composition which includes at least one aluminoxane in a first solvent to provide an aluminoxane loaded support; and, contacting the aluminoxane loaded support with a second composition which includes at least one metallocene compound, a second solvent, and a cocatalyst, wherein the cocatalyst includes a second portion of the at least one aluminoxane alone or in combination with an ionic compound and/or a Lewis acid.

1 - 74 . (canceled)  
   
   
       75 . A process for the preparation of a catalyst system, comprising the steps of: 
 a) treating a support material such that it has a loss on dryness of less than 0.5 wt %,    b) combining a support material with a first composition, the first composition comprising a first portion of at least one aluminoxane or mixtures thereof in a first solvent;    c) heating the combined support material with the first composition to a temperature of from at least 30° C. to about 200° C. to provide an aluminoxane loaded support; and,    d) contacting the aluminoxane loaded support with a second composition, the second composition comprising at least one metallocene compound, a second solvent, which may be the same or different from the first solvent, and a cocatalyst, wherein the cocatalyst includes a second portion of the at least one aluminoxane, which may be the same or different from the first portion of the at least one aluminoxane or mixtures thereof, alone or in combination with an ionic compound and/or a Lewis acid.    
   
   
       76 . The process of  claim 75  wherein the first composition is further defined in that it contains at least 5 mmoles of the aluminoxane per gram of support material.  
   
   
       77 . The process of  claim 75  wherein the support material is treated to achieve a loss on dryness of about 0.3% or less before performing step a).