Lignosulfonate salts for use as dyestuff additives

Details Lignosulfonate salts for use as dyestuff additives Lignosulfonate salts for use as dyestuff additives

1986-05-05

1987-12-29

Nielsen, Earl

Bleaching and dyeing; fluid treatment and chemical modification

Organic additive for dye composition, dye composition...

Polymeric additive

530505, C09B 6700

Patent

active

047158646

ABSTRACT:
An improved lignosulfonate salt composition particularly suited for use as a dyestuff dispersant in azo dyestuff-containing dye systems wherein a sulfonated lignin salt is modified by ion-exchange reaction with an amine compound having a lower dissociation constant and pKa than the dissociation constant and pKa of the cation of the sulfonated lignin salt to provide a dispersant for an azo dyestuff which causes less color reduction of the azo dyestuff than the unmodified sulfonated lignin salt dispersant. More specifically, a sulfonated lignin salt having a relatively high pKa, such as a sodium or ammonium salt, is reacted with a lower pKa amine compound, such as triethanolamine, diethanolamine, or monoethanolamine, in amounts from about 0.1 to 2.5 moles per 1,000 grams of lignin to produce an ion exchange reaction between the sodium and ammonium cations and the amine cations to stabilize the lignin dispersant and inhibit its tendency for azo dye reduction in azo dye-containing dye systems.

REFERENCES:
patent: 2594302 (1952-04-01), Ehrensperger
patent: 3412018 (1968-11-01), Monzie
patent: 3455895 (1969-07-01), Niilo-Rama et al.

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