Preparation of a high-hiding and deeply colored pigmentary form

Details Preparation of a high-hiding and deeply colored pigmentary form Preparation of a high-hiding and deeply colored pigmentary form

1979-09-13

1980-12-23

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Organic additive for dye composition, dye composition...

Carboxylic acid or salt thereof

546 37, C09B 6700, C07D 2122

Patent

active

042407931

ABSTRACT:
A process for the preparation of a high-hiding, deeply colored pigmentary form of perylene-3,4,9,10-tetracarboxylic acid bis-(4'-ethoxyphenyl)-imide by heating the finely divided crude pigment, which is in the form of agglomerates, formed from primary particles of length 0.15 .mu.m or less, in cyclohexanone or a mixture of cyclohexanone and water at from 30.degree. to 200.degree. C., and isolating the pigment.

REFERENCES:
patent: 4074965 (1978-02-01), Kruse et al.
patent: 4115386 (1978-09-01), Gall et al.

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