Salts of the 1:2 chromium complex of 4-(5'-chloro-2'-hydroxy-3'-sulfophenylazo)-3-methyl-1-phenylpyrazol-5-on e and 4-(3', 5'-dichloro-2'-hydroxyphenylazo)-3-methyl-1-phenylpyrazol-5-one

US4618673A · kind A · utility

Assignee

• Sandoz AG · CH

Inventor

• Jacky Dore · Basel, CH

Key dates

• Filing date: Sep 22, 1981
• Grant date: Oct 21, 1986
• Expiry date: Sep 22, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B45/16
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Asymmetric 1:2 chromium complexes of the formula, ##STR1## in which A is a group of the formula ##STR2## in which X is halogen, nitro or methyl, PA0 Y is hydrogen or nitro, PA0 * designates the carbon atom bound to the azo group, PA0 each Z is halogen or nitro, both substituents being the same, PA0 each of R.sub.1 and R.sub.2, independently, is phenyl or phenyl substituted by a total of up to three substituents selected from halogen, C.sub.1-6 alkyl, C.sub.1-6 alkoxy, nitro and cyano (maximum of two nitro and/or cyano), and PA0 M.sup..sym. is hydrogen or an equivalent of a non-chromophoric cation, PA0 with the proviso that the sulpho group is in salt form, and mixtures of two or more of such 1:2 asymmetric complexes, which complexes and mixtures are useful for dyeing nitrogen-containing organic substrates e.g., natural and synthetic polyamides such as wool, silk and nylon, polyurethanes and leather. The dyes build-up well and the obtained dyeings exhibit notable fastness to light, wet treatments, rubbing, ironing, wool chlorination, acids and alkalis and resistance to carbonization. Some of the dyes are also useful in printing lacquers and ball-point pen inks and for dyeing metals …