US 4,820,309 AGranted

1:2-chromium complex dyes for tanned leather

AssigneeSandoz Ltd.

InventorHerbert Holliger

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Abstract

Complexes of the formula ##STR1## wherein each R.sub.1 is independently (a) the radical of a coupling component of the active methylene non-cyclic or homocyclic series, (b) the radical of a coupling component of the heterocyclic series or (c) the radical of a coupling component of the monocyclic benzene series, with the proviso that at least one R.sub.1 is the radical of a coupling component of the active methylene non-cyclic or homocyclic series, each R.sub.2 is independently hydrogen, C.sub.1-4 alkyl or --SO.sub.2 NR.sub.4 R.sub.5, each R.sub.3 is independently hydrogen, halo, C.sub.1-4 alkyl or --SO.sub.2 NR.sub.4 R.sub.5, and each M and M.sub.1 is independently hydrogen or a cation, wherein each R.sub.4 is independently hydrogen, C.sub.1-4 alkyl or C.sub.2-3 hydroxyalkyl, and each R.sub.5 is independently hydrogen, C.sub.1-4 alkyl, C.sub.2-3 hydroxyalkyl, cyclohexyl, cyclohexyl substituted by methyl, phenyl or phenyl substituted by methyl, with the proviso that at least one of Ring A and R.sub.1 of each disazo ligand bears an --SO.sub.2 NR.sub.4 R.sub.5 group, and mixtures of such or containing such complexes, the use of such complexes and mixtures for dyeing substrates dyeable with anionic dyes (e.g., tanned leather and pelts), substrates dyed therewith, processes for synthesizing such complexes and mixtures and disazo compounds useful in their synthesis.

Claims32

Dependent claims

A complex of the formula ##STR30## wherein each R.sub.1 is independently (a) the radical of a coupling component of the active methylene non-cyclic or homocyclic series, (b) the radical of a coupling component of the heterocyclic series or (c) the radical of a coupling component of the monocyclic benzene series, with the proviso that at least one R.sub.1 is the radical of a coupling component of the active methylene non-cyclic or homocyclic series,

each R.sub.2 is independently hydrogen, C.sub.1-4 alkyl or --SO.sub.2 NR.sub.4 R.sub.5,
each R.sub.3 is independently hydrogen, halo, C.sub.1-4 alkyl or --SO.sub.2 NR.sub.4 R.sub.5, and
each M and M.sub.1.sup..sym. is independently hydrogen or a cation,
wherein each R.sub.4 is independently hydrogen, C.sub.1-4 alkyl or C.sub.2-3 hydroxyalkyl, and
each R.sub.5 is independently hydrogen, C.sub.1-4 alkyl, C.sub.2-3 -hydroxyalkyl, cyclohexyl, cyclohexyl substituted by methyl, phenyl or phenyl substituted by methyl, with the proviso that at least one of Ring A and R.sub.1 of each diasazo ligand bears an --SO.sub.2 NR.sub.4 R.sub.5 group, a mixture of such complexes or a mixture of such a complex or mixture of complexes with at least one complex of the formula ##STR31## wherein each R'.sub.1 is independently (b) the radical of a coupling component of the heterocyclic series or (c) the radical of a coupling component of the monocyclic benzene series, and
each R.sub.2, R.sub.3, M and M.sub.1.sup..sym. is as defined above, with the proviso that at least one of Ring A and R'.sub.1 of each diasazo ligand bears an --SO.sub.2 NR.sub.4 R.sub.5 group.

3 more elements

Dependencies are inferred from the claim text.