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

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

1991-03-28

1992-09-29

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Alkali metal silicate containing

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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