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US 10,072,101 B2Granted
Cycloolefin rubber and method of production of same and rubber composition, cross-linked rubber, and tire
AssigneeZeon Corporation
InventorsYasuo Tsunogae, Shingo Okuno, Naoaki Kuramoto
Life of this patent
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Abstract
A cycloolefin rubber having a weight average molecular weight of 100,000 to 800,000, having a silyl group at the polymer chain end, and containing a fatty acid ester of a polyvalent alcohol. A cycloolefin rubber excellent in processability at the time of blending and kneading and excellent in low heat buildup property can be provided.
Claims6
A method of production of a cycloolefin rubber having a weight average molecular weight of 100,000 to 800,000, having a silyl group at a polymer chain end, and containing a fatty acid ester of a polyvalent alcohol, the method comprising:
- a first step of performing ring-opening polymerization of a monocycloolefin and end modification by a compound having a silyl group to obtain a polymer solution containing a cycloolefin polymer having a silyl group at a polymer chain end, and
- a second step of causing the cycloolefin polymer contained in the polymer solution to coagulate in the presence of the fatty acid ester of a polyvalent alcohol.
Dependencies are inferred from the claim text.