Process for producing thermoplastic elastomers
CA 1268281 C · Owner: Sumitomo Chemical Company, Limited · Inventors: Imai, Akio; Seki, Tomoaki; Yoshida, Nobuyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing a thermoplastic elastomer comprising a block copolymer of the A-B-A' type wherein A, is a monovinyl aromatic hydrocarbon polymer block B is a, conjugated diolefin polymer block and A' is either the same, as A or a polymer block derived from a dialkenyl aromatic hydrocarbon or a dihalogenated hydrocarbon which process, comprises polymerizing a monovinyl aromatic hydrocarbon in a polymerization medium in the presence of an organomonolithium compound as a polymerization initiator adding a conjugated diolefin to perform block copolymerization, and further adding a monovinyl aromatic hydrocarbon to perform polymerization or in the alternative adding a dialkenyl aromatic …
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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 April 24, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 24, 2007.
- 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.