Process for the preparation of triazine carbamates
CA 2335137 A1 · Owner: Zhao, Hong · Inventors: Zhao, Hong
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is the preparation of 1,3,5-triazine carbamates which are suitable for use as cross-linking agents in curable compositions particularly in , coating compositions which are capable of curing at relatively low temperatures without releasing formaldehyde during cure. The process includes the step of contacting 1,3,5-triazine derivative having cyanate-displaceable leaving groups (i.e. cyanuric chloride) a cyanate-containing reagent (i.e. , potassium cyanate) and an isocyanate-reactive compound such as an alcohol in , the presence of a polar solvent or in the presence of a non-polar solvent in combination with a phase transfer catalyst.
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 May 10, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 10, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 10, 2021.
- 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.