Polyurethane-polyester hybrid resin system having improved stability
CA 2222093 A1 · Owner: Borden, Keith A. · Inventors: Borden, Keith A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is drawn to a polyurethane-polyester hybrid resin system wherein the components of the system have improved shelf life stability. The resin system comprises an A-Side comprising a multifunctional isocyanate and a free radical initiator. The hybrid resin system also comprises a B-Side comprising a hydroxyl-terminated unsaturated polyester polyol an , ethylenically unsaturated monomer a polyurethane catalyst, a polymerization inhibitor, and optionally a peroxide promoter chain extender and filler. The , B-Side polymerization inhibitor of the present invention comprises substituted hindered phenol-type compounds with ring substituents producing activated benzylic …
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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 April 10, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 10, 2019.
- 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.