Alkali soluble latex thickeners
CA 1278893 C · Owner: Eldridge, Emmojean · Inventors: Shay, Gregory D.; Eldridge, Emmojean; Kail, James E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Alkali soluble thickeners are disclosed which are aqueous emulsion copolymers of: (A) about 20-70 weight percent of an alpha beta-monoethylenically unsaturated carboxylic acid typically methacrylic acid;, (B) about 20-80 weight percent of a monoethylenically unsaturated monomer lacking surfactant capacity, typically ethyl acrylate; (C) about 0.5-60 weight percent of a, nonionic urethane monomer which is the urethane reaction product of a monohydric nonionic surfactant with a monoethylenically unsaturated monoisocyanate preferably one lacking ester groups like alpha alpha-dimethyl-m-isopropenyl benzyl isocyanate; and (D) from 0 up to about 2 weight percent of a polyethylenically unsaturated …
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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 January 8, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 2008.
- 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.