Process for preparing 4,4'-diamino-1,1'-dianthraquinonyl pigment

Details Process for preparing 4,4'-diamino-1,1'-dianthraquinonyl pigment Process for preparing 4,4'-diamino-1,1'-dianthraquinonyl pigment

1990-08-27

1992-01-07

Group, Karl

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

552212, C08K 517

Patent

active

050787942

ABSTRACT:
Process for preparing 4,4'-diamino-1,1'-dianthraquinonyl pigments by desulphonation of 4,4'-diamino-1,1'-dianthraquinonyl-3,3'-disulphonic acid in sulphuric acid, characterized in that after the desulphonation water is added to the sulphuric acid solution, 4,4'-diamino 1,1'-dianthraquinonyl is isolated as sulphate, the sulphate is hydrolysed, if necessary by redissolving it in sulphuric acid and adding the solution to water, and the pigment is isolated, if necessary, after treatment with an organic solvent.

REFERENCES:
patent: 3194820 (1966-02-01), Jost et al.
patent: 3234242 (1966-02-01), Jost et al.

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