Bifunctional polyaddition compounds as crosslinkers for polyurethane powder coatings
CA 2428398 A1 · Owner: Wenning, Andreas · Inventors: Wenning, Andreas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are a polyaddition compound containing uretdione and carboxyl groups and a process for preparing the polyaddition compound. The polyaddition compound has a melting point of 40-200°C, a free NCO content of 0-5% by weight, an NCO functionality of at least 1.5 a number-, average molar mass of 1,000-10,000 and is produced by reacting A) a polyisocyanate having a uretdione group B) a, hydroxycarboxylic acid or mercaptocarboxylic acid and at least one of the following C)-F): C) a monofunctional compound reactive with an NCO group, D) an aliphatic or cycloaliphatic polyol, E) a polyol containing a functional group, and F) an aliphatic or cycloaliphatic polyamine. The polyaddition …
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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 May 9, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 9, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2025.
- 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
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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.