Polymerization of norbornene derivatives and catalytic system suitable for use therein.

摘要

A process for the polymerization of norbornene derivatives, which comprises contacting the monomer(s) with a catalytic system, obtainable by combining the following two components: component 1 - a tungsten compound obtainable by combining a tungsten halide with a phenol compound which is not substituted with a bulky alkyl group at the positions ortho with respect to the hydroxyl group, and component 2 - one or more compounds of the general formula: <CHEM> in which Q represents Sn or Si, in which R<1> , R<2> and R<3> each represent an optionally substituted alkyl group having in the range of from 1 to 20 carbon atoms, an optionally substituted cycloalkyl group having in the range of from 3 to 6 carbon atoms in the cycloalkyl ring or an optionally substituted phenyl group and in which R<1> and R<2> each may also represent hydrogen. A catalyst system to be used for said process and copolymers obtained by this process.