Patent ID: 6034021
Filing Date: 2000-03-07
Classification: C07F,C08F,Y10S

Abstract:
A catalyst composition for addition polymerization comprising a metal complex corresponding to the formula: ##STR14## wherein: M is a Group 4 metal in the +2, +3, or +4 formal oxidation state;L is a group containing a divalent cyclic or noncyclic, non-aromatic, anionic, dienyl ligand group bound to M and Z, said L group containing up to 60 nonhydrogen atoms;Z is a divalent moiety covalently bound to both L and L', comprising boron, or a member of Group 14 of the Periodic Table of the Elements, said moiety having up to 60 non-hydrogen atoms;L' is L or an anionic, aromatic ligand group bonded to M via delocalized .pi.-electrons, said L' group having up to 60 nonhydrogen atoms;X' independently each occurrence is a Lewis base containing up to 40 nonhydrogen atoms;X independently each occurrence is a monovalent anionic moiety having up to 20 non-hydrogen atoms, provided however that neither X is an aromatic group that is .pi.-bonded to M; optionally, two X groups may be covalently bound together forming a divalent dianionic moiety having both valences bound to M; or two X groups together form a neutral, conjugated or nonconjugated diene that is .pi.-bonded to M (whereupon M is in the +2 oxidation state); or further optionally one or more X and one or more X' groups may be bonded together thereby forming a moiety that is both covalently bound to M and coordinated thereto by means of Lewis base functionality;n is zero, one or two; andq is a number from 0 to 3, and an activating cocatalyst.