Process for producing 4,4'-diamino-1,1,'-dianthraquinonyl pigments
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United States of America Patent
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Jun 14, 1994
Grant Date -
N/A
app pub date -
Jul 30, 1992
filing date -
Aug 8, 1991
priority date (Note) -
Expired
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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.
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