Cationic imidazole azo dyes

US6762287B2 · kind B2 · utility

Assignee

• Ciba Specialty Chemicals Corporation · US

Inventor

• Peter Mockli · Amriswil, CH

Key dates

• Filing date: Apr 10, 2003
• Grant date: Jul 13, 2004
• Expiry date: Apr 10, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B44/16
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Dyes of formula (1) or (2) wherein R1, R1′, R2 and R2′ are each independently of the others hydrogen, C1-C4alkyl, halogen or nitro, R3, R3′, R4 and R4′ are each independently of the others C1-C4alkyl unsubstituted or substituted by OH, C1-C4alkoxy, halogen, CN or phenyl, R5 is hydrogen or C1-C4alkyl, R6 is unsubstituted or amino-substituted C5-C12alkyl; or unsubstituted or amino-substituted C5-C8cycloalkyl; or phenyl-substituted C1-C4alkyl; or wherein R5 and R6 together with the nitrogen atom linking them from a piperazine ring, which is substituted, at the nitrogen atom that is not bonded to the phenyl group, by C1-C4-alkyl or phenyl, the alkyl and phenyl radicals mentioned as substituents of the nitrogen atom of the piperazine ring being unsubstituted or substituted by amino, X1, X2, X3 and X4 are each independently of the others hydrogen, C1-C4alkyl, C1-C4alkoxy or halogen, Y1 is a bridging member of formula (I) or —NH—(CH2)6—NH—, and X− is an anion, as wels as methods of dyeing or printing textile materials, leather, paper or glass fibres with those dyes, are described.