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. 15, 1990
Filed:
Nov. 23, 1988
Applicant:
Inventors:
Manfred Patsch, Wachenheim, DE;
Gerhard Epple, Weisenheim, DE;
Helmut Flohr, Mainz, DE;
Helmut Degen, Frankenthal, DE;
Uwe Nahr, Mutterstadt, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548417 ;
Abstract
A vat dye based on monobromofluoranthene is prepared by a process in which monobromofluoranthene which contains no more than 7% of dibromofluoranthene is reacted with 1-amino-4-benzoylaminoanthraquinone, the reaction product is condensed at from 50.degree. to 70.degree. C. in 83-88% strength sulfuric acid to give the carbazole compound, and the latter is then further brominated to a bromine content of from 20 to 23% by weight. The dyes obtained by the novel process are very useful for dyeing cotton.