Cationic azo dyes with a 1-hydroxynaphthalene 3-sulfonic acid coupling component, useful for coloring paper

US4935499A · kind A · utility

Assignee

• BASF SE

Inventors

• Manfred Ruske · Ludwigshafen, DE
• Hans-Juergen Degen · Lorsch, DE

Key dates

• Filing date: Sep 27, 1988
• Grant date: Jun 19, 1990
• Expiry date: Sep 27, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S8/919
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Paper is colored by a process in which a compound which, in the form of the free acid, is of the formula I ##STR1## where, in each case independently of one another, A is unsubstituted or methyl substituted C.sub.1 -C.sub.6 -alkylene or vinylene, PA1 R is each hydrogen or C.sub.1 -C.sub.4 -alkyl, PA1 X is each --CO-- or --SO.sub.2 --, PA1 K is each a cationic group and PA1 Y is hydrogen, chlorine or bromine.