Patent ID: 6812304
Filing Date: 2004-11-02
Classification: B01J,C08F,Y02P

Abstract:
In a process for producing catalysts useful for the production of broad molecular weight distribution polyolefins using a supported boraaryl catalyst comprising an inorganic oxide support which has been chemically and thermally dehydroxylated to remove substantially all hydroxyl from the support surface and an organometallic compound comprising a group 3-10 transition metal or lanthanide metal and at least one boraaryl ligand, to obtain premixed catalyst powders having improved storage stability, the improvement comprising contacting the supported catalyst with an organoaluminum compound in a hydrocarbon solvent to fill from about 90 to 150 percent of the pore volume of the supported catalyst and provide a molar ratio of aluminum to transition/lanthanide metal from 0.5:1 to 50:1, recovering the premixed catalyst and drying under conditions such that the rate of solvent removal is from about 0.05 to about 5 g solvent/g support/hr.