Method of manufacturing cationic acrylamide polymers, cationic acrylamide polymers, and the applications of these polymers
CA 2006768 C · Owner: Mitsui Chemicals, Incorporated · Inventors: Itoh, Hiroshi; Nitta, Atsuhiko; Takaki, Toshihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides cationic acrylamide polymers which are highly effective as paper strength agents drainage, agents and suspension flocculants and which do not show much, temporal deterioration; it also provides a method of manufacturing said polymers wherein the manufacturing equipment is compact and can be installed on site and the cationicity of, the polymers can be modified in a short time. This invention comprises a method of manufacturing cationic acrylamide polymers by reaction with a, hypohalogenite,of a (meth)acrylamide homopolymer a copolymer of, (meth)acrylamide and acrylonitrile a copolymer of, (meth)acrylamide and N,N-dimethylacrylamide in a high, temperature range of 50 …
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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
- Filed December 28, 1989 and granted March 11, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 28, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.