Nonionic associative thickeners
CA 1297215 C · Owner: Desoto, Inc. · Inventors: Kravitz, Fran Karen; Shay, Gregory D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract Nonionic associative thickeners suitable for use in aqueous coating compositions comprise an aqueous solution polymer of (a) from about 40 percent to about 98 percent, preferably from 60 to 95 percent, by weight of a monoethylenically unsaturated monomer such as acrylamide, N,N-dimethyl acrylamide vinyl pyrrolidone, hydroxyethyl acrylate and mixtures thereof; and (b) from about 2 percent to about 60 percent, preferaby from 5 to 40 percent by weight of, a nonionic urethane monomer which is the urethane reaction product of a monohydric nonionic surfactant with a monoethylenically unsaturated monoisocyanate.
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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 March 10, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 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.