Copper phthalocyanine pigment process

Details Copper phthalocyanine pigment process Copper phthalocyanine pigment process

1981-12-14

1983-06-07

Poer, James

Compositions: coating or plastic

Materials or ingredients

106309, C09B 4704

Patent

active

043869661

ABSTRACT:
Premilled semichloro copper phthalocyanine or partially sulfonated semichloro copper phthalocyanine is slurried and stirred with sulfuric acid (50-60% and preferably 55-59% in the case of semichloro copper phthalocyanine and 50-61% and preferably 58-61% in the case of partially sulfonated semichloro copper phthalocyanine) at 50.degree.-85.degree. C., preferably 65.degree.-75.degree. C. for 1/2 to 4 hours. The slurry is diluted with to less than 35% sulfuric acid concentration and stirred at 60.degree.-95.degree. C. for 1/2 to 4 hours. The resulting highly transparent pigment is filtered and dried.

REFERENCES:
patent: 2799594 (1957-07-01), Ehrich
patent: 2799595 (1957-07-01), Kudzin
patent: 3024247 (1962-03-01), Moser et al.
patent: 4289698 (1981-09-01), Stepp
B. Honigmann et al., Zeitschrift fur Kristallographic, 122, pp. 185-205 (1965).
B. Honigmann, Berichte der Bundesgesellschaft Fur Physikalische Chemie, 71 (1967).

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