Patent ID: 6677265
Filing Date: 2004-01-13
Classification: C08F

Abstract:
A process which comprises concurrently feeding:a) separate continuous or substantially continuous feeds of (i) at least one polymerizable vinylolefin, and (ii) a solution in an organic liquid solvent of at least one metallocene and at least one aluminoxane and/or at least one metallocene-aluminoxane reaction product; or b) separate continuous or substantially continuous feeds of (i) at least one polymerizable vinylolefin, (iii) at least one metallocene optionally in an organic liquid solvent or diluent, and (iv) at least one aluminoxane optionally in an organic liquid solvent or diluent; or c) separate continuous or substantially continuous feeds of (i) and (ii) and at least one of (iii) and (iv) into a liquid reaction medium containing solvent and at least one vinylolefin, such that particles of catalytically-active, prepolymerized, self-supported olefin polymerization catalyst composition are formed in said reaction medium, the metallocene used as the feed or in making up the feed having in the molecule at least one polymerizable olefinic substituent, and wherein said catalytically-active, prepolymerized, self-supported olefin polymerization catalyst composition has a productivity, when fresh and if tested in slurry form for productivity with ethylene in a 2-liter autoclave that has been precharged with about one liter of isobutane and that is charged with ethylene to a total pressure of 450 psig at 90Â±2Â° C., of at least 13,900 grams of polyethylene per gram of catalyst in one hour.