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. 29, 1977
Filed:
Feb. 05, 1976
Applicant:
Inventor:
Rudolf Sundermann, Leverkusen, DT;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2604 / ; 2604 / ; 2604 / ; 260463 ; 260939 ;
Abstract
Aromatic cyanic acid esters having a free hydroxyl group which is not sterically hindered are prepared by reacting aromatic dihydroxy and polyhydroxy compounds with cyanogen halide in aqueous solution in the presence of a water-immiscible organic solvent and an inorganic base. Aromatic cyanic acid esters prepared by the process have the formula ##STR1## wherein Ar is optionally substituted aromatic and n and m are the same or different and are one of the numbers from 1 to 5, with the sum m and n being not greater than the number of replaceable hydrogen atoms in the radical Ar.