Stable, aqueous dispersions of polyurethane-ureas
CA 1300790 C · Owner: Mobay Corporation · Inventors: Markusch, Peter H.; Rosthauser, James W.; Tirpak, Robin E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo-2698, PC-173, STABLE, AQUEOUS DISPERSIONS OF POLYURETHANE-UREAS ABSTRACT OF THE DISCLOSURE, The present invention is directed to a process for the preparation of aqueous polyurethane-urea dispersions with improved hydrolytic stability by a) forming an aqueous polyurethane-urea dispersion optionally by chain extending an aqueously dispersed isocyanate-terminated prepolymer, containing carboxylic acid groups neutralized with volatile organic bases b) converting the volatile, organic base-neutralized carboxylic acid groups to nonvolatile cationneutralized carboxylate groups by adding alkali metal salts of organic or inorganic acids having a pKa greater than 0 to the aqueous …
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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 May 12, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 12, 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.