Preparation of transparent and easily dispersible perylene-3,4,9

Details Preparation of transparent and easily dispersible perylene-3,4,9 Preparation of transparent and easily dispersible perylene-3,4,9

1979-01-16

1980-08-12

Berch, Mark L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

8637, C09B 318, C09B 6700, C07D47106

Patent

active

042174554

ABSTRACT:
A process for the preparation of transparent pigmentary forms, of high tinctorial strength, of perylene-3,4,9,10-tetracarboxylic acid bis-p-phenetidide and bis-p-chloroanilide, in which the diimide concerned is converted to the leuco compound, and the latter, with or without prior isolation, is then oxidized in aqueous suspension in the presence of surfactants or while exposed to shearing forces in the presence or absence of surfactants, after which the pigment is isolated.
The pigments give highly transparent very pure colorations when used unreduced, while in white reductions they give very deep colorations with substantially more yellowish hues than those given by the prior art pigments.

REFERENCES:
patent: 2543747 (1951-03-01), Shrader
patent: 3340254 (1967-09-01), Jentzsch
patent: 3340264 (1967-09-01), Walker
patent: 4115386 (1978-09-01), Gall et al.
Balmforth et al., B.I.O.S. Trip #2351, 9/9/46 to 11/7/46.

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