US 4,123,428 AGranted

Metallized polyazo dyes derived from a coupling component obtained by acidic condensation of formaldehyde with at least one phenolic compound

AssigneeSandoz Ltd.

InventorsHerbert Holliger, Heinz Wicki

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Abstract

Metal complex polyazo dyes having, as a coupling component radical, the radical of a coupling component K, being the product of the condensation, under acidic conditions, of the formaldehyde with a compound or mixture of compounds of formula (a), ##STR1## AND/OR A COMPOUND OR MIXTURE OF COMPOUNDS OF FORMULA (B), ##STR2## WHEREIN EACH R.sub.1 , R.sub.2, R.sub.3 and R.sub.4 is independently is hydrogen, halogen, hydroxy or optionally substituted alkyl or alkoxy, and M is hydrogen or a non-chromophoric cation, The mol ratio of formaldehyde to the other compound(s) (a) and/or (b) being at least 0.6:1 and at least 50 mol % of the other compound(s) (a) and/or (b) containing a --COOM group, and, as diazo or bisdiazo component radical, a radical D- or -D- where D contains at least one metallized azo group, their production and their use for the dyeing of anionic dyeable substrates, particularly leather. The dyes have good levelling capacity and the obtained dyeings possess notable fastness to light.

Claims26

Dependent claims

A metal complex polyazo dye having a diazo component radical D- or a bisdiazo component radical --D-- and, as a coupling component radical, the radical of a coupling component K,

wherein
D-- is a diazo component radical having at least one metallized azo group,
--D-- is a bisdiazo component radical having at least one metallized azo group, and
K is the product of the condensation, under acidic conditions, of formaldehyde with
(i) a compound of the formula ##STR17## or a mixture of such compounds, (ii) a compound of the formula ##STR18## or a mixture of such compounds, or (iii) a compound of the formula ##STR19## or a mixture of such compounds, and a compound of the formula ##STR20## or a mixture of such compounds, wherein each of
R.sub.1, r.sub.2, r.sub.3 and R.sub.4 is independently hydrogen, halo, hydroxy, alkyl, substituted alkyl, alkoxy or substituted alkoxy, and
M is hydrogen or a non-chromophoric cation, with the provisos that the mol ratio of formaldehyde to the compound or mixture of compounds of (i), (ii) or (iii) is at least 0.6:1 and that at least 50 mol % of the compounds or mixture of compounds of (i), (ii) or (iii) contains a --COOM group,
wherein
M is hydrogen or a non-chromophoric cation.

6 more elements

Dependencies are inferred from the claim text.