Process for the production of pigments in the presence of an azo

Compositions: coating or plastic – Coating or plastic compositions – Alkali metal silicate containing

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106493, 106 22, 106496, 534558, 534573, 534581, 534582, C09B 3900

Patent

active

051511290

ABSTRACT:
A process for the production of a pigment composition comprising precipitating a pigment coupling component from alkaline solution by adding to it an acid, in the presence of a pre-formed, water-soluble azo dyestuff; and subsequently coupling the precipitated coupling component, containing the azo dyestuff, with a pigment diazo or tetrazo component, ensuring that at no time is any substantial amount of uncoupled diazo or tetrazo component present, to form a pigment composition containing the water-soluble azo dyestuff.

REFERENCES:
patent: 2237768 (1941-04-01), Scudi
patent: 3759733 (1973-09-01), Bradley
patent: 3776749 (1973-12-01), McKay et al.
patent: 4968352 (1990-11-01), Keys et al.

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