PROCESS FOR PRODUCING CYCLOOLEFIN RANDOM COPOLYMERS

摘要

Disclosed herein is a process for the production of cycloolefin random copolymers comprising copolymerizing ethylene with at least one specific cycloolefin in a liquid phase in the presence of a catalyst and a solvent in a polymerization vessel, wherein ethylene is copolymerized with the cycloolefin while feeding the cycloolefin or a mixture of the cycloolefin and the solvent onto inside circumferential wall of the polymerization vessel above the gas-liquid interface in the polymerization vessel. The proposed process ensures a smooth copolymerization reaction and a continuous and stable running of the apparatus for a prolonged period of time, and is productive of ethylene-cycloolefin random copolymers which have a uniform quality and are excellent in heat resistance, heat aging property and various mechanical properties.