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:
Feb. 10, 1987
Filed:
Dec. 18, 1985
Applicant:
Inventors:
Alexander Davatz, Bubendorf, CH;
Tibor Somlo, Birsfelden, CH;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548260 ; 548257 ;
Abstract
Process for preparing 2-(2'-hydroxyphenyl)-benzotriazoles of the formula ##STR1## from 2-nitro-2'-hydroxyazobenzenes of the formula ##STR2## which comprises reducing a 2-nitro-2'-hydroxyazobenzene compound in a strongly basic medium in the presence of an aromatic dihydroxy or dioxo compound as catalyst and of an alcohol having more than one carbon atom. The 2-(2'-hydroxyphenyl)-benzotriazole compounds are known stabilizers for organic materials.