Susan L Schlegel

47158646, Dec 29, 1987

May 5, 1986

6/859384

Peter Dilling - Isle of Palms SC
Susan L. Schlegel - Goose Creek SC

Westvaco Corporation - New York NY

C09B 6700

8557

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.

47482354, May 31, 1988

Apr 16, 1987

7/038955

Peter Dilling - Isle of Palms SC
Susan L. Schlegel - Goose Creek SC

Westvaco Corporation - New York NY

C07G 100

530501

A method of producing an amine-containing salt of a sulfonated lignin compound which may be effectively spray-dried for use in dry form comprising the steps of methylolating a lignin at an alkaline pH, lowering the pH of the methylolated lignin to precipitate the lignin, washing the precipitated lignin at an acid pH to remove impurities, sulfonating the methylolated lignin in the presence of a sulfur-oxygen-containing compound, an amine compound, and ammonium hydroxide and/or ammonium sulfite or bisulfite to produce an amine/ammonium salt thereof, and heating and spray-drying the sulfonated lignin amine/ammonium salt to effectively evaporate ammonia therefrom to produce the sulfonated lignin amine-containing salt in dry form.