Polyisocyanate mixtures, a process for their preparation and their use in coating compositions
CA 2527548 C · Owner: Schmitz, Joerg · Inventors: Melchiors, Martin; Wamprecht, Christian; Schmitz, Joerg
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 polyacrylate-modified polyisocyanates which are , i) prepared from aromatic, araliphatic cycloaliphatic and/or aliphatic , polyisocyanates having an NCO content of 5% to 25% by weight an NCO , functionality 2, a viscosity measured as solvent free resin of 150 to 200,000 mPa.cndot.s at 23°C, and ii) contain at least one structural unit of the formula (I), (see formula I), wherein is hydrogen or a methyl group, R1 is an optionally heteroatom-containing hydrocarbon radical and R2 is a hydrocarbon radical having at least one isocyanate group and optionally urethane, allophanate, biuret uretdione, isocyanurate and/or , iminooxadiazinedione groups and n ist a …
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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 November 22, 2005 and granted October 29, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 22, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
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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.