Aqueous dispersions of encapsulated polyisocyanates
CA 2064335 A1 · Owner: Markusch, Peter H. · Inventors: Markusch, Peter H.; Tirpak, Robin E.; Sarpeshkar, Ashok M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo3586, PU-308, AQUEOUS DISPERSIONS OF ENCAPSULATED POLYISOCYANATES ABSTRACT OF THE DISCLOSURE, The present invention is directed to an aqueous dispersion of an encapsulated polyisocyanate which contains unreacted isocyanate groups and is prepared by a) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight and b) reacting the dispersed polyisocyanate with a polyamine having primary and/or secondary amino groups and a molecular weight of 400 or less in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of at least 0.05:1Ø, The present invention is also directed to aqueous compositions containing the previously …
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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
- Filed March 23, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 23, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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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.