Method for production of hydrophilic polymer
CA 1333439 C · Owner: Nippon Shokubai Kagaku Kagyo Co. Ltd. · Inventors: Yano, Akito; Fujihara, Teruaki; Irie, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the production of a hydrophilic polymer by the polymerization of a liquid containing an aqueous hydrophilic monomer solution in a reaction vessel provided with at least one rotary stirring blade which, comprises polymerising said hydrophilic monomer in a reaction vessel wherein, at least a portion of the inner wall surface of said reaction vessel repeatedly exposed to said aqueous solution or said hydrophilic polymer and a gas has the surface roughness, Rmax, thereof adjusted to not more than 3 µm and at the same time said portion of the inner wall of surface is kept cooled constantly to a temperature of not more than 70°C from behind said portion with a cooling medium.
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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 December 6, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 6, 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.
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.