Preparation of 4,4',7,7'-tetrachlorothioindigo pigments of high

Details Preparation of 4,4',7,7'-tetrachlorothioindigo pigments of high Preparation of 4,4',7,7'-tetrachlorothioindigo pigments of high

1982-01-06

1984-02-14

Raymond, Richard

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D33364, C09B 710

Patent

active

044318243

ABSTRACT:
4,4',7,7'-Tetrachlorothioindigo pigments of high color strength are prepared by oxidizing 3-hydroxy-4,7-dichlorothionaphthene or a mixture of tetrachlorothioindigo and hydroxydichlorothionaphthene in aqueous alkaline suspension with a salt of a nitro-aromatic sulfonic acid, in the presence of a high-boiling, water-immiscible or only slightly water-miscible aromatic liquid, at from 40.degree. to 100.degree. C., and heating the organic suspension to 110.degree.-180.degree. C. Pigmentary forms of tetrachlorothioindigo are isolated which give deep colorations of high brilliance when reduced with white pigments.

REFERENCES:
patent: 2158032 (1981-01-01), Lubs et al.
patent: 2804464 (1957-08-01), Kaplan et al.
patent: 4229583 (1980-10-01), Spietschka et al.
patent: 4260778 (1981-04-01), Schutze et al.

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