Process for producing 4,4'-diamino-1,1,'-dianthraquinonyl pigmen

Details Process for producing 4,4'-diamino-1,1,'-dianthraquinonyl pigmen Process for producing 4,4'-diamino-1,1,'-dianthraquinonyl pigmen

1992-07-30

1994-06-14

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

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

544100, 106493, C08K 5357

Patent

active

053206789

ABSTRACT:
A desulfonation reaction mixture of 4,4'-diamino-1,1'-dianthraquinonyl-3,3'-disulfonic acid obtainable in a conventional manner is mixed in the form of an aqueous acid suspension with a surface active agent, followed by filtration, whereby filterability and flowability of the produced 4,4'-diamino-1,1'-dianthraquinonyl pigment are efficiently improved.

REFERENCES:
patent: 4236933 (1980-02-01), Torre
JP Kokoku 38-25842 (abstract only) published Dec. 4, 1963.
JP Kokai 3-131665 (abstract only) published Jun. 5, 1991.

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