Process for the preparation of isocyanic acid esters
CA 1136641 A · Owner: Eszakmagyarorszagi Vegyimuvek · Inventors: Peter, Istvan; Kalicz, Gyula; Szolnoki, Tibor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an improved method for the preparation of isocyanate esters of the general formula (I) R - (NC0)n (I), wherein n is one and R stands for a straight-chained or branched C1- 10 alkyl benzyl, cyclohexyl, phenyl, halophenyl methylphenyl or methoxyphenyl group, or n is two and R stands for a hexamethylene phenylene, methylenebis(phenyl-, ene), ethylenebis(phenylene) or methylenebis(halophenylene) group from the, respective amines of the general formula (II) R - (NH2)n, wherein R and n are as defined above. According to the invention an amine of the general formula (II) is reacted with a compound of the general formula (III), R'-O-C0-R1 (III), wherein R' stands for …
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
- Granted November 30, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 30, 1999.
- 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.