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:
Dec. 08, 1981
Filed:
Jul. 14, 1980
Niklaus Buhler, Rheinfelden, CH;
Hans Bosshard, Basel, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
The invention relates to asymmetrical thioindigo compounds of the formula I ##STR1## wherein at least one substituent R is different from a substituent R' and preferably at most three Rs or R's are different from hydrogen, e.g. the compound (I), wherein theRs and R's in the positions 4, 6, 7, 4', 6' and 7' are hydrogen, the R in position 5 is methyl and the R' in position 5' is --(CH.sub.2) OCOCH.sub.3. These compounds can be obtained by a novel process in simple and economic manner and in high purity by reacting a compound of the formula II ##STR2## (wherein X is halogen) with corresponding thiophenols, and cyclising the unsubstituted or substituted 2-thiophenyl-carboxymethylene-benzothiophen-3-ones thereby obtained. Some of the compounds of the formula I are known per se and they are used, inter alia, as disperse, melt spinning and pigment dyes.