Process for the production of highly pure, polyfunctional cyanic acid esters
CA 1063129 A · Owner: Bayer Aktiengesellschaft · Inventors: Rottloff, Gunther; Putter, Rolf; Grigat, Ernst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Highly pure aromatic polyfunctional cyanic acid esters having a high stability in storage and being extraordinarily suitable for use as starting compound for the production of plastics by cyclopoly-tri-merization are obtained by a special process. A di- or polytrialkyl ammonium phenolate of the formula: in which, Ar represents an optionally substituted aromatic radical, R1,R2 and R3 are the same or different and each represents a linear or branched alkyl radical, and n is a number from 2 to 6, is reacted at a temperature in the range of from -40 to +65°C in the presence of a trialkyl amine and an organic sovent with an excess of cyanogen halide. The excess of cyanogen halide is up to 80% by …
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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
- Granted September 25, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 25, 1996.
- 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.