Process for producing granular, water-swellable crosslinked acrylic copolymer, and its use
CA 1239000 A · Owner: Mitsui Petrochemical Industries, Ltd. · Inventors: Honda, Narimichi; Wakumoto, Hiroshi; Nakano, Takayuki
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 granular water-swel-, lable crosslinked acrylic copolymer which comprises, copolymerizing in an aqueous medium in the presence of a radical polymerization initiator a monomeric mixture comprising (a) at least one acrylic amide monomer selected from the group consisting of acrylamide methacrylamide, and N-methyl substitution products of these amides and (b) at least one acrylic crosslinkable comonomer selected from the group consisting of N,N'-alkylene- or arylene-bisacrylamides, N,N'-alkylene-bismethacrylamides alkylene-, bisacrylates, alkylene-bismethacrylates alkylene glycol-, bisacrylates, polyalkylene glycol-bisacrylates alkylene, glycol-bismethacrylates and …
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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 July 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 5, 2005.
- 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.