Azo dye reduction improvement of lignin

Details Azo dye reduction improvement of lignin Azo dye reduction improvement of lignin

1981-03-04

1982-10-26

Tungol, Maria Parrish

Bleaching and dyeing; fluid treatment and chemical modification

Organic additive for dye composition, dye composition...

Polymeric additive

8588, 260124R, 260208, C09B 900, C09B 6730, C09B 6710, C09B 6740

Patent

active

043559964

ABSTRACT:
Improved sulfonated lignin surfactants are provided for use as dispersants in dyestuffs. The process for providing the improved surfactants relates to using metals and borate salts to react with the azo dye reducing dihydroxy functions of the lignin molecule through chelation and ester formation mechanisms thereby inhibiting the lignin's azo dye reducing characteristics.

REFERENCES:
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patent: 1379175 (1921-05-01), Folsom
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patent: 3726850 (1973-04-01), Detroit
patent: 3763139 (1973-10-01), Falkehag
patent: 4001202 (1977-01-01), Dilling et al.
patent: 4153414 (1979-05-01), Ver Nooy et al.
patent: 4184845 (1980-01-01), Lin

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