Purification of crude organic pigments

Details Purification of crude organic pigments Purification of crude organic pigments

1982-03-31

1984-07-10

Raymond, Richard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

544 74, 546 31, 546167, 548416, C09B 4704

Patent

active

044592337

ABSTRACT:
A process for purifying crude organic pigments, wherein the crude pigment is suspended in a mixture of two organic liquids which are partially or completely immiscible with one another, the suspension is mixed at 50.degree.-180.degree. C. until equilibrium has been reached, the phases are allowed to separate, the phase containing the impurities (i.e. the first liquid) is separated off and the purified pigment is isolated from the other phase (i.e. the second liquid).
Finely divided crude pigments can, directly after purification, be converted, while in the second liquid, into pigmentary forms.
The process gives pigments of high purity, which after conversion into pigmentary forms give deep, brilliant colorations.

REFERENCES:
patent: 3523030 (1970-08-01), Malin et al.
patent: 4239685 (1980-12-01), Pigasse

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