Water-insoluble sulphur dyes, their preparation and use

US5374302A · kind A · utility

Assignee

• Cassella Aktiengesellschaft · DE

Inventors

• Wolfgang Bauer · Krefeld, DE
• Willi Steckelberg · Hofheim, DE
• Josef Ritter · Graz, AT
• Wilhelm Mauelshagen · Bad Camberg, DE

Key dates

• Filing date: Oct 6, 1993
• Grant date: Dec 20, 1994
• Expiry date: Oct 6, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D11/328
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The water-insoluble dyes of the formula I ##STR1## in which, for example, F is the dye chromophore of C.I. Leuco Sulphur Black 1, PA1 R is hydrogen, alkyl, PA1 M.sup..sym. is a quaternary ammonium cation or phosphonium cation in which the sum of carbon atoms in the hydrophobic radicals present is at least 6, and PA1 n is such a large number that the dye I contains 5 to 20% by weight of --COO.sup..crclbar. groups, are suitable in particular for producing recording fluids.