Process for the polymerization of cycloolefins

Claim 1

A cycloolefin metathesis polymerization process comprising polymerizing at least one unsaturated alicyclic compound selected from the group consisting of (1) unsaturated alicyclic compounds containing five carbon atoms in the ring and one double bond in the ring and (2) non-conjugated, unsaturated alicyclic compounds containing at least seven carbon atoms in the ring and at least one double bond in the ring, by subjecting said alicyclic compounds or mixtures thereof to polymerization conditions in the presence of a catalyst system comprising (A) at least one transition metal salt selected from the group consisting of tungsten halides and tungsten oxyhalides, (B) at least one compound selected from the group consisting of alkylaluminum sesquihalides, alkylaluminum dihalides, dialkylaluminum halides and trialkylaluminums, (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) pentachlorophenol or pentabromophenol, wherein the molar ratio of A:B:C:D lies within the range of 1:0.5-10:0.5-3:0.1-3 wherein aliphatic or cycloaliphatic hydrocarbons or mixtures thereof are employed as a polymerization solvent.