Aqueous polyurethane dispersions and adhesives based thereon
CA 2023840 A1 · Owner: Tirpak, Robin E. · Inventors: Cline, Robert L.; Tirpak, Robin E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo3284, PU-365, AQUEOUS POLYURETHANE DISPERSIONS AND ADHESIVES BASED THEREON, ABSTRACT OF THE DISCLOSURE The invention is related to an adhesive comprising a stable, fine particle size aqueous dispersion of polyurethane-urea which is the reaction product of an isocyanate-terminated prepolymer with an amine-containing chain extending agent which is characterized in that the functionality of said agent is about 2.05 to about 2.50. The adhesive was surprisingly and unexpectedly found to exhibit an increased softening point temperature as compared to the corresponding temperature of related adhesives which contains no such chain extending agent. Mo3284
Read the whole patent
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 August 23, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 2012.
- 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.