Imidazomethylene dyes

US4472581A · kind A · utility

Assignee

• BASF SE

Inventors

• Manfred Patsch · Monsheim, DE
• Manfred Ruske · Ludwigshafen, DE

Key dates

• Filing date: Aug 13, 1982
• Grant date: Sep 18, 1984
• Expiry date: Aug 13, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B69/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Cationic dyes of the general formula ##STR1## where A and A' may be identical or different and are each a monovalent radical of a dye from the series comprising the azo or quinophthalone dyes, or A and A' independently of one another are each one of the radicals of the formulae ##STR2## R is C.sub.1 -C.sub.6 -alkyl, benzyl or aryl, R.sup.1 is hydrogen, C.sub.1 -C.sub.4 -alkyl or aryl, D' and D" are respectively a monovalent and a divalent radical of a dye from the series comprising the triphenylmethane or xanthene dyes, n is an integer .gtoreq.1 and m is an integer .gtoreq.1, the sum (n+m) being .ltoreq.10 on average, are soluble in dilute acids, and, when they are used for wet-end dyeing of paper, give bleeding-fast, bleachable dyeings and a colorless effluent.