Patent ID: 6790805
Filing Date: 2004-09-14
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*)(L)xM(X)y â€ƒwherein M is a Group 3-10 metal, L is a bulky ancillary anionic polymerization-stable carbocyclic, heterocyclic or constraint-inducing ligand, L* is a bulky ancillary anionic polymerization-stable heterocyclic ligand selected from the group consisting of boraaryl, pyrrolyl, azaboralinyl, quinolinyl, and pyridinyl, x is 1 to 3, is 1 to 3, x+y is equal to the valence of the metal minus one, and X is selected from the group consisting of halogen, C1-20 alkoxy, C6-20 aryloxy, and alkyl- or aryl-substituted amido; and (b) introducing the precatalyst into a polymerization system and forming an alkylated cationic transition metal catalyst by contacting the precatalyst with an organometallic alkylating agent, wherein the precatalyst and organometallic alkylating agent are contacted in the presence of one or more C2-12 &agr;-olefin monomers.