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US 7,078,497 B2Granted
Disazo dyes, and copper complexes thereof, for dyeing paper
AssigneeCiba Specialty Chemicals Corporation
InventorsAdolf Käser, Holger Lautenbach
Life of this patent
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Abstract
The dyes of formula (1) according to claim 1 and the copper complexes of dyes of formula (2) according to claim 9 or the mixtures of mono-copper complex with the bis-copper complex are excellently suitable for dyeing paper with good light-fastness properties.
Claims16
A dye of formula
- wherein
- Z1 is NHR6,
- R6 being a radical of formula CO—NH—R8, SO2-alkyl or COOR8,
- R8 being hydrogen, alkyl or aryl and
- Z2 is as defined for Z1 or is hydrogen, hydroxy, alkoxy or a radical NHR5,
- R5 being hydrogen, alkyl, aryl, COR8, CO—NHR8 or SO2R8,
- R1 and R3 are each independently of the other hydrogen, hydroxy, alkyl or alkoxy,
- R2 and R4 are each independently of the other hydrogen, hydroxy, alkyl or alkoxy, halogen, sulfo, carboxy, NHCONHR8 or NHCOR8,
- X is azo, azoxy, —NR8—, —NR8CONR9— or a group of formula
- Y being hydroxy, alkoxy or NR9R10,
- R9 and R10 being each independently of the other hydrogen, unsubstituted or substituted alkyl or unsubstituted or substituted aryl,
- n and m are each independently of the other 1 or 2,
- and wherein the rings A and B may each independently of the other carry a fused-on benzene ring.
10 more elements
A method for dyeing paper, which comprises contacting the paper with a tinctorially effective amount of a dye of formula
- wherein
- Z′1 is NHR8,
- R6 being a radical of formula —CO—NH—R8, SO2-alkyl or COOR8,
- R8 being hydrogen, alkyl or aryl and
- Z′2 is as defined for Z′1 or is hydrogen, hydroxy, alkoxy or a radical NHR5,
- R5 being hydrogen, alkyl, aryl, COR8, CO—NHR8 or SO2R8,
- R1 and R3 are each independently of the other hydrogen, hydroxy, alkyl or alkoxy,
- R2 and R4 are each independently of the other hydrogen, hydroxy, alkyl or alkoxy, halogen, sulfo, carboxy, NHCONHR8 or NHCOR8,
- X is azo, azoxy, —NR8—, —NR8CONR9— or a group of formula
- Y being hydroxy, alkoxy or NR9R10,
- R9 and R10 being each independently of the other hydrogen, unsubstituted or substituted alkyl or
- unsubstituted or substituted aryl,
- n and m are each independently of the other 1 or 2,
- and wherein the rings A and B may each independently of the other carry a fused-on benzene ring.
11 more elements
Dependencies are inferred from the claim text.