Method of preparing high activity sulfonated lignin dye dispersa

Details Method of preparing high activity sulfonated lignin dye dispersa Method of preparing high activity sulfonated lignin dye dispersa

1996-09-12

1998-05-12

Einsmann, Margaret

Bleaching and dyeing; fluid treatment and chemical modification

Dry dye composition other than mere mixture of two or more...

8528, 8557, 8588, 8561, 8650, 8653, D06P 148, D06P 150

Patent

active

057499268

ABSTRACT:
Improved dyestuff compositions comprising a dye cake and a dye dispersant are disclosed wherein the dye dispersant comprises sulfonated or sulfomethylated lignin of increased activity and improved heat stability properties and which dispersants are disclosed to be prepared by substantial removal of the low molecular weight component of the sulfonated and sulfomethylated lignin. Exclusion of the low molecular weight portion of the dispersant may be accomplished by fractionation of the sulfonated or sulfomethylated lignin to remove a substantial portion of the molecules having a molecular weight below 3,000. Alternatively, in the case of lignin recovered from sulfate or soda wood pulping processes, the lignin may be fractionated to remove a substantial portion of the molecules having a molecular weight below 3,000 prior to sulfonation or sulfomethylation.

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patent: 4740590 (1988-04-01), Dilling

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