Patent ID: 6291386
Filing Date: 2001-09-18
Classification: B01J,C08F

Abstract:
A process for the in-situ preparation of a single-site transition metal olefin polymerization catalyst which comprises:(a) forming a precatalyst by contacting a boron-containing ionizing agent with a neutral transition metal complex having the formula:(L).sub.n M(X).sub.mwherein M is a Group 3-10 metal, L is a bulky ancillary anionic polymerization-stable carbocyclic, heterocyclic or constraint inducing ligand, X is selected from the group consisting of halogen, C.sub.1-20 alkoxy, C.sub.6-20 aryloxy or alkyl- or aryl-substituted amido, n is 1 to 4, m is 1 to 4 and n+m is equal to the valence of the metal; and(b) introducing the precatalyst into a polymerization system and forming an alkylated cationic transition metal catalyst by contacting said precatalyst with an organometallic alkylating agent.