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:
Oct. 04, 1977
Filed:
Aug. 20, 1976
Applicant:
Inventors:
Sisto Sergio Papa, Milan, IT;
Antonino Condo, Milan, IT;
Assignee:
Aziende Colori Nazionali Affini ACNA S.p.A., Milan, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
2601 / ; 260142 ; 260149 ; 260206 ;
Abstract
A water-soluble triazo dyestuff of the formula: ##STR1## The dyestuff, which is useful in dyeing cotton and other cellulosic fibers, is prepared by diazotizing 2-aminophenol-4-sulfonic acid, coupling the diazotized sulfonic acid with resorcinol, treating the reaction mixture with a copper complexing agent at 35.degree.-40.degree. C and a pH of 5-5.5, separately tetraazotizing 4,4'-diaminobenzanilide, coupling the tetraazotate with the previously formed reaction product to form a diazo-disazoic reaction product, and coupling the latter product with m-aminophenol to produce the desired dyestuff.