Process for improving lightfastness of an azo pigment by heat tr

Details Process for improving lightfastness of an azo pigment by heat tr Process for improving lightfastness of an azo pigment by heat tr

1972-09-26

1976-11-09

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106288Q, 106308Q, 260193, 260208, C08H 1714, C09B 6700

Patent

active

039910440

ABSTRACT:
A process for improving the light-fastness of pigments of the Hansa Yellow and Diarylide Yellow class is described. Azo pigments prepared by coupling diazotized primary aromatic monoamines or tetrazotized primary aromatic diamines with acetoacetarylides in aqueous medium in the absence of surfactants are heated prior to or after separation from the aqueous medium at 120.degree. to about 250.degree. C. until the pigment is converted to crystalline particles having an average particle diameter at least twice that of the pigment which has not been heat treated.

REFERENCES:
patent: 3004821 (1961-10-01), Gano
patent: 3056642 (1962-10-01), Kesler et al.
patent: 3124565 (1964-03-01), Schilling et al.
patent: 3169955 (1965-02-01), Siebert et al.
patent: 3356443 (1967-12-01), Dziomba
patent: 3555003 (1971-01-01), Ribka
patent: 3575957 (1971-04-01), Demler et al.
patent: 3759733 (1973-09-01), Bradley et al.
patent: 3775148 (1973-11-01), Bradley
patent: 3785843 (1974-01-01), Ribka et al.

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