Process for the preparation of copper phthalocyanine pigment

Details Process for the preparation of copper phthalocyanine pigment Process for the preparation of copper phthalocyanine pigment

1991-12-13

1993-07-20

Shah, Mukund J.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

106410, 106412, 540144, C09B 4704

Patent

active

052295087

ABSTRACT:
A process for the preparation of a copper phthalocyanine pigment, which comprises dry grinding crude copper phthalocyanine, treating the dry ground crude copper phthalocyanine with an aqueous solution of a mineral acid under such conditions of acid concentration and temperature as not to transform the .beta. form contained in the ground crude copper phthalocyanine into the .alpha. one to thereby carry out the pigmentation and removing the mineral acid from the resulting mixture.

REFERENCES:
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patent: 3087935 (1963-04-01), Razavi et al.
patent: 3267116 (1966-08-01), Braun
patent: 3936315 (1976-02-01), Ferrill, Jr. et al.
patent: 3954795 (1976-05-01), Jackson
patent: 4104276 (1978-08-01), Kranz et al.
patent: 4298526 (1981-11-01), Sappok et al.
patent: 4386966 (1983-06-01), Fitzgerald
Moser et al. The Phthalocyanines, vol. 1, [1990, Boca Raton, FL, CRC Press] p. 26.

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