Process for producing 4,4'-Diamino-1,1'-dianthraquinonyl pigment

Details Process for producing 4,4'-Diamino-1,1'-dianthraquinonyl pigment Process for producing 4,4'-Diamino-1,1'-dianthraquinonyl pigment

1993-05-10

1995-05-16

Mars, Howard T.

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

Organic compounds

Polycyclo ring system containing anthracene configured ring...

106493, C08K 517

Patent

active

054162637

ABSTRACT:
4,4'-Diamino-1,1'-dianthraquinonyl compounds which are obtained in a known manner and which are easy to agglomerate or aggregate owing mainly to their too fine particle size are conditioned by heating an aqueous suspension consisting essentially of the 4,4'-diamino-1,1'-dianthraquinonyl compound and water in the presence or absence of a mineral acid or an alkali. The thus obtained 4,4'-diamino-1,1'-dianthraquinonyl pigments are used in paints, printing inks, coloring of plastics and the like. The aqueous suspension is preferably prepared by desulfonating a 4,4'-diamino-1,1'-dianthraquinonyl-3,3'-disulfonic acid compound in a mineral acid such as sulfuric acid and then mixing the desulfonation reaction mixture with water or by once isolating the resulting 4,4'-diamino-1,1'-dianthraquinonyl compound and mixing the isolated compound with water.

REFERENCES:
patent: 3228780 (1966-01-01), Grelat
patent: 4969954 (1990-11-01), Schutze et al.
patent: 5078794 (1992-01-01), Schutze et al.

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