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:
May. 04, 1982
Filed:
Dec. 31, 1980
Applicant:
Inventors:
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D06P / ;
U.S. Cl.
CPC ...
8526 ; 8524 ; 8616 ; 8662 ; 2602075 ; 260208 ;
Abstract
It is possible by heating at temperatures of between 65.degree. and 200.degree. C. to convert the known .alpha.-modification of the azo dye of the formula ##STR1## which is unstable to dyeing, completely into the .beta.-modification which is stable to dyeing. The modification transformation can be performed either with the solid dye or with a suspension thereof in an organic, preferably aromatic, solvent. The novel dye modification is stable in dispersion under dyeing conditions, and shows no tendency to flocculate.