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US 4,069,217 AGranted
Solubilized lignosulfonate derivatives
AssigneeAmerican Can Company
InventorsWilliam John Detroit, Michael Elliot Sanford
Life of this patent
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Abstract
Valuable new and widely used compositions of matter are comprised of products having enhanced solubility and increased dispersant and the like surfactant activity which products are resulfonated units of alkaline oxidized, hydrolyzed, partially desulfonated lignosulfonates.
Claims28
A composition comprising:
- a lignosulfonate or an alkali metal salt derivative thereof derived from sulfite waste liquor that has been subjected to alkaline oxidation, hydrolysis and partial desulfonation with subsequent resulfonation;
- said lignosulfonate prior to resulfonation being characterized by a relative molecular size of substantially within the range of 1,000 to 20.,000 and containing combined organic sulfonic sulfur after partial desulfonation of from about 0.5 weight percent to about 5.0 weight percent and from about 1.5 percent to 15 percent by weight of said total combined sulfur upon completion of said resulfonation.
A composition comprising:
- an alkaline oxidized hydrolyzed, partially desulfonated and subsequently resulfonated lignosulfonate;
- said resulfonated lignosulfonate having substituted therein, as the resulfonation units, those of the formula:
- --(CH.sub.2).sub.x --SO.sub.3 H, wherein x has a numerical integral value from 0 to 3;
- or alkali metal salt derivatives thereof;
- and
- said resulfonated lignosulfonate containing between about 11/2 weight percent and about 15 weight percent of total sulfur in combined organic sulfonic sulfonate form;
- said lignosulfonate prior to resulfonation having a relative molecular size of substantially 1000 to 20,000.
4 more elements
Dependencies are inferred from the claim text.