Patent ID: 7125937

Claim:
A process for the polymerization of an ethylenically unsaturated monomer comprising: a. providing a supported metallocene catalyst comprising a stereospecific metallocene catalyst component supported on a polyorganosilsesquioxane support comprising spheroidal polyorganosilsesquioxane support particles having an average particle size within the range of 0.3–20 microns and having an alkylalumoxane co-catalyst component supported on said polyorganosilsesquioxane support by reaction of said alkylalumoxane and said polyorganosilsesquioxane support; and b. contacting said catalyst in a polymerization reaction zone with an ethylenically unsaturated monomer which contains three or more carbon atoms, or which is a substituted vinyl compound and maintaining said reaction under polymerization conditions to produce polymerization of said monomer to produce a stereoregular polymer.