C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
6/197, 260/163.5
C09B 43/12 (2006.01) C09B 43/38 (2006.01) C09B 67/22 (2006.01)
Patent
CA 1095902
Abstract of the Disclosure A process for the production of azo pigments having increased colour strength and purity by condensation of an azo dyestuff carboxylic acid halide of the formula Image (I) wherein A represents an aromatic radical, Q, X, Y and Z represent hydrogen atoms or non-solubilising substituents, and Hal represents a halogen atom, with a diamine of the formula H2N-B-NH2 wherein B represents an arylene radical which optionally contains non-solubilising substituents, in the molar ratio 2:1, which process comprises the use, in addition to the carboxylic acid chloride of the formula I (main component). of an additional component of the formula Image wherein A has the meaning given in formula I, Q', Y, X', Y' and Z' represent non-watersolubilising substituents, whilst at least one of the substituents X', Y' and Z' contains at least two atoms more selected from the series consisting of C, O, S, N or Si than Z, Y or Z, or at least two of the substituents X', Y' or Z' contain at least one atom more selected from the series consisting of C, O, S, N or Si than X, Y or Z, or coupling a mixture of the diazo compound of the amines of the formulae Image and Image wherein X, X', Y, Y', Z and Z' have the given meanings, with a bis-naphthol of the formula Image wherein Q and B have the given meanings. The pigments so obtained give fast and strong red colorations in lacquers and plastics.
294023
Muller Paul
Pugin Andre
Ronco Karl
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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