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US 3,975,369 AGranted
2:1 Metal complexes of 2,2',4'-trihydroxy-3,5-dinitroazobenzene bound to a diphenylamine through an azo bridge
AssigneeSandoz Ltd.
InventorHeinz Wicki
Life of this patent
Estimating the term…
Abstract
Dyes of the formula ##SPC1## Wherein Each of R, R.sub.1, R.sub.2 and R.sub.3 is independently hydrogen, halo, nitro, unsubstituted or substituted alkyl or alkoxy, carboxy or sulfo, R.sub.4 is a diazo component radical, and Me is a metal atom, Are useful for dyeing and printing of leather. They exhaust well on leathers of low affinity and give level dyeings. The dyeings exhibit good fastness to light, water, washing, perspiration, ironing and formaldehyde.
Claims17
A dye of the formula ##SPC11##
- wherein each of
- R, r.sub.1, r.sub.2 and R.sub.3 is independently hydrogen, halo, nitro, alkyl, alkyl substituted by halo, hydroxy or cyano, alkoxy, alkoxy substituted by halo, hydroxy or cyano, carboxy or sulfo,
- R.sub.4 is a diazo component radical, and
- Me is iron, cobalt or chromium,
- wherein
- each alkyl, alkoxy, alkyl chain of substituted alkyl and alkoxy chain of substituted alkoxy independently has 1, 2, 3 or 4 carbon atoms, and
- each halo is independently fluoro, chloro or bromo.
4 more elements
Dependencies are inferred from the claim text.