Process for preparing cycloolefin random copolymer pellets

Details Process for preparing cycloolefin random copolymer pellets Process for preparing cycloolefin random copolymer pellets

C - Chemistry, Metallurgy

08

F

C08F 232/04 (2006.01) B29B 9/10 (2006.01) C08F 2/06 (2006.01) C08F 210/02 (2006.01) C08F 210/16 (2006.01) C08G 61/08 (2006.01)

Patent

CA 2114481

ABSTRACT Disclosed is a process for preparing cycloolefin random copolymer pellets, comprising adding an organic polar solvent to a solution of a copolymer obtained by copolymerizing ethylene and a specific cycloolefin and if desired an a-olefin other than ethylene, in an amount exceeding such an amount that the liquid mixture exhibits the cloud point, separating the copolymer solution utilizing phase separation phenomenon into a concentrated phase containing the cycloolefin random copolymer in a high concentration and a dilute phase containing said copolymer in a low concentration, feeding the obtained concentrated phase to an extruder where the solvents are removed and the copolymer is melted during extrusion processing, followed by pelletizing the copolymer. According to the invention, the steps for preparing cycloolefin random copolymer pellets can be reduced, and moreover, mold staining can be inhibited in the molding process of the resultant pellets because the pellets have low contents of the low molecular weight copolymer, the unreacted monomer, etc.

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