Process for producing dioxazine violet pigment

Details Process for producing dioxazine violet pigment Process for producing dioxazine violet pigment

1987-12-01

1989-02-14

Yarbrough, Amelia Burgess

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106471, C08K 534

Patent

active

048044172

ABSTRACT:
Dioxazine violet pigment clear in color hue, high in tinting strength and good in dispersibility, which is suitable for ink, is prepared by treating a crude dioxazine violet with sulfuric acid (to finer it) and then treating an aqueous suspension of the resulting dioxazine violet in coexistence of an alcohol and an inorganic salt.

REFERENCES:
patent: 4253839 (1981-03-01), Spietschka et al.
patent: 4317908 (1982-03-01), Sakaguchi et al.
patent: 4481358 (1984-11-01), Sakaguchi et al.
Derwent Abstract 83-744618/34, Japanese Patent No. 3748, Jul. 18, 1983.
Chemical Abstract, vol. 62, Abstract 2915h (1965).

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