Preparation of transparent pigmentary forms of 4,4',7,7'-tetrach

Details Preparation of transparent pigmentary forms of 4,4',7,7'-tetrach Preparation of transparent pigmentary forms of 4,4',7,7'-tetrach

1980-04-07

1982-06-01

Brust, Joseph Paul

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D33364

Patent

active

043329551

ABSTRACT:
A transparent pigmentary form of 4,4',7,7'-tetrachlorothioindigo is prepared by oxidizing the leuco compound of tetrachlorothioindigo in aqueous alkaline suspension, in the presence of a dithionite, at from 20.degree. to 100.degree. C., with simultaneous exposure to shearing forces. Preferably, the oxidation is carried out in the presence of a surfactant.
The pigment obtained gives brilliant, transparent full-shade colorations, while white reductions have a deep pure reddish hue.

REFERENCES:
patent: 2044796 (1936-06-01), Krauss et al.
patent: 2045475 (1936-06-01), Krauss et al.
patent: 2062443 (1936-12-01), Carleton et al.
patent: 3752688 (1973-08-01), Fuchs et al.

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