Sulfur dyes
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United States of America Patent
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Oct 5, 1999
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N/A
app pub date -
Oct 30, 1996
filing date -
May 3, 1995
priority date (Note) -
Expired
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Abstract
New sulfur dyes comprising in their preparation at least one sulfur dye intermediate of the formula I ##STR1## wherein R and R.sub.1 are independently nitro, nitroso or amino, are produced by including in their preparation at least one modifying agent selected from the group of: A) an aldehyde; B) urea; C) a benzoquinone or naphthoquinone; and D) monoethanolamine or by treating an already prepared sulfur dye involving such an intermediate in its preparation, with at least one aldehyde, benzoquinone or naphthoquinone or with monoethanolamine.
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