Nigrosine dye and process for producing the same
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United States of America Patent
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Issued Date -
Jan 11, 2007
app pub date -
Aug 26, 2004
filing date -
Aug 26, 2004
priority date (Note) -
Abandoned
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Abstract
A non-pyrophoric nigrosine dye and a method of production thereof. A nigrosine dye wherein B-A.ltoreq.0.04% by weight if, in analysis using a gas chromatograph apparatus equipped with a glass-made sample injection port, the aniline content of the sample determined at a temperature of 200.degree. C. at the sample injection port is written as A% by weight, and the aniline content of the sample determined at a temperature of 260.degree. C. at the sample injection port is written as B% by weight. A method of producing a nigrosine dye which comprises a heat treatment of a neutralized nigrosine base.
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