Production of beta form pigmentary copper phthalocyanine

Details Production of beta form pigmentary copper phthalocyanine Production of beta form pigmentary copper phthalocyanine

1991-04-01

1995-09-12

Venkat, Jyothsna

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

540140, 540144, 106200, 106448, C09B 6750, C09B 4704

Patent

active

054497744

ABSTRACT:
The present invention provides a process for producing beta-form pigmentary copper phthalocyanine comprising a) producing crude copper phthalocyanine by charging phthalic anhydride or phthalimide, urea, a copper compound and a catalyst, at a substantially continuous and uniform rate, into a reaction chamber containing dry, granular, pre-formed copper phthalocyanine, and removing the reaction product from the reaction chamber; and b) convening the crude copper phthalocyanine produced in step a) into pigmentary form, by milling it either in the dry state or in an aqueous medium; mixing the milled material with an aqueous emulsion comprising i) a liquid C.sub.6 -C.sub.20 amine which is insoluble in water or alkali but is soluble in acid and ii) a surfactant capable of emulsifying the liquid amine; rendering the resulting mixture acidic to thereby dissolve the amine; and finally separating the desired pigmentary copper phthalocyanine from the treatment mixture.

REFERENCES:
patent: 3188318 (1965-06-01), Mack
patent: 3598625 (1971-08-01), Buckwalter
patent: 3647496 (1972-03-01), Bagal et al.
patent: 4158572 (1979-06-01), Blackburn et al.
"The phthaloeyanines" vol. II by Moser and Thomas, CRC Press Inc. (1983).

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