Catalyst for the polymerization of olefins, process for its preparation and its use

Abstract

The present invention relates to a supported catalyst for the polymerization of olefins, which can be prepared by reacting the reaction product formed from an aluminoxane and at least one metallocene with a microporous, polymeric support.

1 . A supported polymerization catalyst, which can be prepared by reacting a reaction product formed from an aluminoxane and at least one metallocene with a microporous, polymeric support.  
     
     
         2 . A catalyst as claimed in  claim 1 , wherein the pore volume of the microporous, polymeric support is at least 50% by volume, based on the total volume of the support material.  
     
     
         3 . A catalyst as claimed in  claim 1 , wherein the microporous, polymeric support used is a thermoplastic.  
     
     
         4 . A catalyst as claimed in claim 
 wherein the polymeric support used is polyethylene, polypropylene, polystyrene, polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, polyamide, polymethylmethacrylate or polycarbonate.    
     
     
         5 . A catalyst as claimed in  claim 1 , 
 wherein the aluminoxane used is a compound of the formula (II)                          for the linear type and/or the formula (III)                          for the cyclic type, where, in the formulae (II) and (III), the radicals R may be identical or different and are a C 1 -C 6 -alkyl group, a C 5 -C 18 -aryl group, benzyl or hydrogen, and p is an integer from 2 to 50.    
     
     
         6 . A catalyst as claimed in  claim 1 , 
 wherein a metallocene is used in its preparation.    
     
     
         7 . A catalyst as claimed in  claim 1 , 
 wherein the metallocene used is a zirconocene.    
     
     
         8 . A process for the preparation of a catalyst as claimed in  claim 1 , wherein the reaction product formed from an aluminoxane and at least one metallocene is reacted with a microporous, polymeric support.  
     
     
         9 . A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula R a —CH═CH—R b , in which R a  and R b  are identical or different and are a hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms, or R a  and R b , together with the atoms connecting them, can form a ring, at a temperature of from −60 to 200° C., at a pressure of from 0.5 to 100 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst, wherein a catalyst as claimed in  claim 1  is used.  
     
     
         10 . The process as claimed in  claim 9 , wherein propylene or ethylene is polymerized or copolymerized.