Method for the production of polymethyl methacrylate
CA 1296480 C · Owner: Yuyama, Masahiro · Inventors: Moritani, Masahiko; Kato, Yasuyuki; Yuyama, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved method for the production of a polymer of a monofunctional (unsaturated) monomer particularly poly-, methyl methacrylate by a rapid crosslinking polymerization which comprises polymerizing a mixture of a monofunctional (unsaturated) monomer, selected from methyl methacrylate and a monomer mixture comprising predominantly methyl methacrylate which may partially contain a polymer of the monomer (i.e. a syrup of the monomer or monomer mixture) and a polyfunctional (unsaturated) monomer in the presence of (1) a radical polymerization initiator (2) a reducing, compound containing sulfur in the molecule thereof (3) an, amine hydrohalogenate or a quaternary ammonium halide and (4) a …
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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.