Process for the production of dis-azo pigment whose amine conten

Details Process for the production of dis-azo pigment whose amine conten Process for the production of dis-azo pigment whose amine conten

1994-10-26

1996-02-06

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

534575, 534887, 106496, C09B 35035, C09B 6754

Patent

active

054896720

ABSTRACT:
A process for the production of a dis-azo pigment which is excellent in sanitary condition and almost free of a residual coupler component and decomposition products derived from the residual coupler component, and has a reduced aromatic amine content, and a dis-azo pigment produced by the said process, the process comprising the steps of (a) coupling-reacting a solution of a tetrazonium salt of benzidine with a slurry of acetoacetanilide of which the amount is stoichiometrically excess relative to an amount of said tetrazonium salt, to prepare a dis-azo pigment slurry, and (b) adding a halogen to the dis-azo pigment slurry to treat the acetoacetanilide in said slurry.

REFERENCES:
patent: 4124582 (1978-11-01), Ribka et al.
patent: 4643770 (1987-02-01), Hays
patent: 4720541 (1988-01-01), Rieper et al.
Jomaru et al., Chemical Abstracts, vol. 119, No. 4, 26 Jul. 1993, Abstract No. 29975h, p. 101 JP-A-05065426.

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