Nitrite-oxidized lignosulfonates and method of making the same and use of these as dispersants
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United States of America Patent
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Dec 8, 1992
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N/A
app pub date -
May 23, 1991
filing date -
May 23, 1991
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Expired
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Abstract
A nitrite-oxidized base lignosulfonate and a method of making the same; the method comprises providing a base lignosulfonate material and oxidizing it in the presence of sodium nitrite under alkaline conditions at a temperature greater than about 100.degree. C.; useful products of same are dispersants for dyes and dispersants for setting materials e.g. gypsum.
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