Process for the preparation of polymers of cyclopentene or copolymers of cyclopentene with unsaturated alicyclic compounds

Claim 1

A process for the preparation of cyclopentene polymers and copolymers comprising the polymerization of cyclopentene or mixtures of cyclopentene and at least one nonconjugated, unsaturated alicyclic compound containing at least seven carbon atoms in the ring and at least one double bond in the ring, by subjecting cyclopentene or its mixtures with said nonconjugated unsaturated alicyclic compound to polymerization conditions in the presence of a catalyst system comprising (A) a transition metal salt selected from the group consisting of tungsten halides and tungsten oxyhalides, (B) an organoaluminum compound, (C) at least one hydroxy compound of the general formula ROH wherein R is selected from the group consisting of alkyl, cycloalkyl, alkoxyalkyl, aralkyl and aryl, and (D) a halogenated phenol of the general formula: ##STR4## where X and Y are chlorine or bromine and Q, L and M are selected from the group consisting of H and R, and where R=--C n H 2n+1 and n=1-4, and wherein at least one of Q, L and M is H or R, and wherein the molar ratio of A:B:C:D lies within the range of 1:0.5-10:0.5-3:0.1-3.