Process for the production of pigments

Details Process for the production of pigments Process for the production of pigments

C - Chemistry, Metallurgy

09

D

6/197, 6/27, 400

C09D 11/00 (2006.01) C09B 41/00 (2006.01) C09B 43/00 (2006.01) C09B 67/22 (2006.01)

Patent

CA 2039479

P-18015/A/MA 1993 Process for the Production of Pigments Abstract of the disclosure 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 tetrazocomponent, 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.

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