Patent ID: 6207608
Filing Date: 2001-03-27
Classification: C08F,Y10S

Abstract:
Catalysts for the high activity polymerization of .alpha.-olefins, comprising:an ansa-metallocene metal amide complex of the formula: ##STR6##wherein Cp independently and in each occurrence is cyclopentadienyl, indenyl, or fluorenyl, or a hydrocarbyl, alkyl, aryl, silyl, halo, halohydrocarbyl, hydrocarbylmetalloid, or halohydrocarbylmetalloid substituted derivative of said cyclopentadienyl, indenyl, or fluorenyl, X is a bridging group which links the Cp groups, M is a metal selected from the group consisting of Group 3, 4, and 5 metals, R and R' are the same or different and are each hydrogen or hydrocarbyl radicals of from C.sub.1 to C.sub.20, or silyl radicals, and n is from 3 to 5; andan aluminum alkyl of the formula Al(R""').sub.3 wherein R""' is C.sub.1 to C.sub.20 hydrocarbyl radical, anda cocatalyst selected from the group consisting of alumoxanes, triarylcarbenium salts, ammonium salts, silver salts, ferrocenium salts, tris(pentafluorophenyl)borane and magnesium dichloride wherein the ansa-metallocene metal amide and the aluminum alkyl are combined before the cocatalyst is added and wherein the order of combination forms a cationic ansa-metallocene alkyl complex active species wherein the active species has a high olefin polymerization activity.