Process for producing cycloolefin random copolymers
CA 1340147 C · Owner: Wamura, Hiroo · Inventors: Hayashi, Takashi; Uesugi, Shunyo; Wamura, Hiroo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is a process for the production of cycloolefin random copolymers by copolymerization of ethylene with a cycloolefin of the general formula I (wherein n is 0 or a positive integer, and R1 to R12 are the same or different, and each represents a hydrogen or halogen atom or a hydrocarbon group, or R9 (or R10) and R11 (or R12) when taken together, may form a mono- or poly-cyclic ring) in a hydrocarbon in the presence of a catalyst wherein the copolymerization is carried out in a polymerization reactor in which a gas phase is not substantially present.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted November 24, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 24, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.