Process for homo-or copolymerization of conjugated diens

摘要

According to this invention, pyridine or phosphabenzene ligand-containing Group 5, 8, 9, lanthanide and actinide metal complexes corresponding to the formula: <CHEM> are disclosed as useful for polymerization of conjugated ethylenically unsaturated addition polymerizable monomers or copolymerization of one type of conjugated ethylenically unsaturated addition polymerizable monomer with at least one different type of conjugated ethylenically unsaturated addition polymerizable monomer or copolymerization of at least one type of conjugated ethylenically unsaturated addition polymerizable monomers with ethylenically monounsaturated addition polymerizable monomers. M is a metal from one of Groups 5, 8 or 9 of the Periodic Table of the Elements, the lanthanides or actinides; T is nitrogen or phosphorus; R<A>, R<B> and R<C> are independently each occurrence hydrogen or a group having from 1 to 80 atoms not counting hydrogen further defined herein, the R<B> and R<A> groups are optionally bonded to the same T=C grouping may be joined together to form a divalent ligand group and two R<C> groups are optionally joined together forming a divalent ligand group; X is an anionic ligand group having up to 60 atoms not counting hydrogen, provided however that in no occurrence is X a cyclic, delocalized, aromatic group that is pi -bonded to M, and optionally two X groups together form a divalent ligand group; X' independently each occurrence is a neutral Lewis base ligand having up to 30 nonhydrogen atoms; x is an integer number from 0 to 5; and x' is a number from 0 to 3. Novel homo- and copolymers are obtained which have advantageous properties for the production of a wide range of products and for the modification of plastics, such as high impact polystyrene or impact-modified polypropylene