N,N-dialkylaniline azo dye solutions
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United States of America Patent
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Jul 4, 2000
Grant Date -
N/A
app pub date -
Sep 24, 1998
filing date -
Sep 24, 1998
priority date (Note) -
Expired
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Abstract
A stabilized, concentrated solution of a diazo dye is prepared by coupling diazotized aniline or substituted aniline with a dialkylaniline in the presence of an aromatic solvent. After removal of the aqueous phase, the solution is stabilized by the addition of a branched chain, primary or secondary, C.sub.3 -C.sub.6 alkyl phenol.
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