The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 1990
Filed:
Mar. 23, 1989
Jean-Pierre Senet, La Chapelle La Reine, FR;
Serge Lecolier, Janville Sur Juine, FR;
Paul Caubere, Nancy, FR;
Deng Min-Zhi, Shanghai, CN;
Societe Nationale des Poudres et Explosifs, Paris, FR;
Abstract
The invention relates to a process for the preparation of acyl isocyanates of formula ##STR1## in which R is an alkyl radical, a substituted or unsubstituted naphthyl or phenyl radical or a substituted or unsubstituted aromatic heterocyclic radical, which consists in reacting an acyl halide of formula ##STR2## in which R has the above meaning and X denotes a fluorine, chlorine or bromine atom, with a sodium or potassium cyanate in the presence of a compound chosen from tin(IV), zinc or nickel(II) halides. The acyl isocyanates thus prepared are very useful for forming ureas or carbamates.