Process for the purification of azo pigments by stirring an aque

Details Process for the purification of azo pigments by stirring an aque Process for the purification of azo pigments by stirring an aque

1975-09-25

1978-11-07

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106288Q, 106308Q, 106308N, 106311, 260176, 260193, C09B 4300, C09B 4600

Patent

active

041245822

ABSTRACT:
A process for the purification of azo pigments, wherein the crude pigment is stirred for some time in an aqueous alkaline suspension in a pH range from 9 to 12, preferably from 11 to 12, at temperatures between 20.degree. to 80.degree. C and subsequently the crude pigment is filtered off and washed neutral. The pigments treated by this process show a clearer and more brilliant shade and are faster to bleeding when incorporated, for example, into a thermoplastic material than the untreated pigments.

REFERENCES:
patent: 3004821 (1961-10-01), Gano
patent: 3056642 (1962-10-01), Kesler et al.
patent: 3071815 (1963-01-01), Mackinnon
patent: 3124565 (1964-03-01), Schilling et al.
patent: 3137686 (1964-06-01), Dietz et al.
patent: 3169955 (1965-02-01), Siebert et al.

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