Water dilutable, polyester polyols and their use in coating compositions
CA 2096287 C · Owner: Kahl, Lothar · Inventors: Yuva, Nusret; Bock, Manfred; Blum, Harald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to water dilutable urethane, group-containing polyester polyols having an acid number of 6 to 45 mg KOH/g, wherein 25 to 100% of the acid groups are neutralized by bases, a hydroxyl number of 20 to 250 mg KOH/g a molecular weight (Mw) of 2,000 to 150,000 and a urethane content (-NH-CO-0-) of 2 to 16% by weight wherein the, polyester polyol is the at least partly neutralized reaction product of, a) 35 to 90% by weight of branched polyester polyols having a hydroxyl number of 40 to 600 and prepared from a1) 0 to 60% by weight of monocarboxylic acids a2) 6 to 65% by weight of di- and/or tricarboxylic acids or their anhydrides, a3) 10 to 70% by weight of alcohols …
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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 14, 1993 and granted April 15, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2015.
- 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.