Sulfonated lignin dispersants and dyestuffs
AssigneeAmerican Can Company
InventorStephen Y. Lin
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Abstract
Dispersants, especially well suited for use with insoluble dyes, are produced by reacting hydroxyl benzyl alcohol compounds with sulfonated lignin derivatives. The dispersants have high levels of heat stability, coupled with desirable dye reduction, staining, foaming, milling and viscosity-reducing properties. Dyestuffs, dye pastes and dye baths, as well as methods utilizing them, are provided.
Claims19
As a composition of matter, the lignin adduct of a sulfonated lignin material containing about 2 to 8 percent by weight of combined organic sulfur, and about 0.05 to 4.0 millimoles, per gram of the lignin moiety of said material, of an hydroxyl benzyl alcohol compound having the general formula:
- ##STR2## wherein n is an integer from 1 to 3 and A is a substituent selected from the group consisting of hydrogen, alkyl groups containing 1-4 carbon atoms and the hydroxymethyl group.
In a method for the production of a lignin adduct, the steps comprising:
- forming an aqueous reaction mixture of a sulfonated lignin material and an hydroxyl benzyl alcohol compound, said mixture containing about 0.05 to 4.0 millimoles of said alcohol compound per gram of the lignin moiety in said lignin material, said alcohol compound having the general formula:
- ##STR3## wherein n is an integer from 1 to 3 and A is a substituent selected from the group consisting of hydrogen, alkyl groups containing 1-4 carbon atoms and the hydroxymethyl group;
- establishing in said mixture a temperature of about 50.degree. to 100.degree. Centigrade and a pH of about 3 to 12 to effect reaction between said lignin material and said alcohol compound;
- and
- maintaining those conditions in said mixture for a period of from about 1 to 24 hours to substantially convert said lignin material and said alcohol compound to a lignin adduct.
Dependencies are inferred from the claim text.