Method for the production of polymethacrylates
CA 1296482 C · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Kato, Yasuyuki; Yasunori, Yukio; Yuyama, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to an improved method for the production of polymethacrylates by rapid polymerization, which comprises polymerizing an unsaturated monomer selected from a methacrylate and a monomer mixture comprising predominantly a methacrylate which may partially contain a polymer of the monomer (i.e. a syrup of the monomer or monomer mixture) in the presence of a radical polymerization initiator a, reducing compound containing sulfur in the molecule thereof, a copper-containing compound and a specific tertiary amine hydrohalogenate or a quaternary ammonium halide. Said polymethacrylates can form molded products having excellent mold release characteristics and are …
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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 February 25, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 25, 2009.
- 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.