Patent ID: 6365686
Filing Date: 2002-04-02
Classification: A61L,C07F,C08F,Y10S

Abstract:
A process for preparing a cycloolefin copolymer by polymerization of from 0.1 to 99.9% by weight, based on the total amount of monomers, of at least one polycyclic olefin, from 0 to 99.9% by weight, based on the total amount of monomers, of at least one monocyclic olefin and from 0.1 to 99.9% by weight, based on the total amount of monomers, of at least one acyclic 1-olefin in the presence of a catalyst system comprising at least one cocatalyst and at least one metal complex having a strained geometry of the formula (I) whereinM1 is a metal of groups 3 to 10 or of the lanthanide series of the Periodic Table of the Elements, R1 is a delocalized acyclic &pgr; system which optionally contains up to 5 hetero atoms, or an unsubstituted or substituted delocalized C5-C40-cyclic &pgr; system which optionally contains up to 5 hetero atoms, R2 is a single- or multi-membered bridge which links the radicals R1 and R3and comprises at least one atom of group 14 of the Periodic Table of the Elements or at least one boron atom and optionally comprise one or more sulfur or oxygen atoms and can form a fused ring system together with R1, R3 is an anionic or nonionic ligand which is coordinated to M1 and comprises one or more nitrogen, phosphorus, oxygen and/or sulfur atoms and can form a fused ring system together with R2, and R4 is an anionic or nonionic ligand, n is 0,1,2,3, or 4 depending on the valence of M, and wherein the metal complex prior to use in the polymerization reaction is preactivated with the cocatalyst.