Aqueous milling of quinacridone pigment

Details Aqueous milling of quinacridone pigment Aqueous milling of quinacridone pigment

1983-02-16

1984-03-27

Poer, James

Compositions: coating or plastic

Materials or ingredients

106309, C08J 300

Patent

active

044392400

ABSTRACT:
Pigmentary grade quinacridone pigments are prepared from crude quinacridone by dry milling the crude quinacridone to form aggregated low crystallinity material followed by milling the low crystallinity in water using steel shot as the milling elements. In a preferred aspect of the invention from 0.5 to 5 wt percent, based on quinacridone, of phthalimidomethylquinacridone is present in the water milling step. In another preferred aspect of the invention the water milled pigment is extracted with a dilute hot acid in the presence of naphthenic acids and then dried.

REFERENCES:
patent: 3752688 (1973-08-01), Fuchs et al.
patent: 4088506 (1978-05-01), Wetzel
patent: 4094699 (1978-06-01), Fitzgerald
patent: 4158572 (1979-06-01), Blackburn et al.
patent: 4260424 (1981-04-01), Mizoguchi et al.
patent: 4371642 (1983-02-01), Jaffe

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