Process for lowering the viscosity of sulfonated lignins

Details Process for lowering the viscosity of sulfonated lignins Process for lowering the viscosity of sulfonated lignins

1981-08-13

1982-07-06

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

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

8528, 8557, 8650, 8908, 260124R, D06P 6702, C07S 100

Patent

active

043380913

ABSTRACT:
Disclosed herein is a process for preparing sulfonated lignins processing a low viscosity which comprises pretreating a lignin with sodium dithionate and subsequently reacting the pretreated lignin with sodium sulfite and an aldehyde. The resulting sulfonated lignins are useful as dispersants for disperse dyes and vat dyes.

REFERENCES:
patent: 2860113 (1954-06-01), Adler et al.
patent: 3094515 (1963-06-01), Keirstead et al.
patent: 3156520 (1964-11-01), Blaisdell
patent: 3726850 (1973-04-01), Detroit
patent: 3769272 (1973-10-01), Hintz
patent: 4131564 (1978-12-01), Dilling
patent: 4184845 (1980-01-01), Lin

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