Process for producing polymer by ring-opening polymerization

Details Process for producing polymer by ring-opening polymerization Process for producing polymer by ring-opening polymerization

C - Chemistry, Metallurgy

08

F

402/531, 402/580

C08F 2/02 (2006.01) C08F 130/08 (2006.01) C08F 132/04 (2006.01) C08G 61/08 (2006.01)

Patent

CA 2021024

AB5TRACT OF THE DISCLOSURE A process for producing a polymer by ring- opening polymerization of a norbornene-type monomer, which comprises starting the ring-opening polymerization in the presence of a Ziegler-type catalyst consisting essentially of an organometallic compound of a metal belonging to the groups I to III of the periodic table and titanium tetrahalide, carrying out the ring-opening polymerization until the norbornene-type monomer shows a conversion ratio of not less than 60%, and then adding a tungsten and/or molybdenum-based metathesis catalyst to the polymerization reaction system to continue the ring-opening polymerization.

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