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US 4,131,564 AGranted
Lignin-containing dye dispersing composition
AssigneeWestvaco Corporation
InventorPeter Dilling
Life of this patent
Estimating the term…
Abstract
A dye dispersing composition having improved fiber staining characteristics, lower viscosity and improved heat stability is disclosed which comprises, a mixture of from 97% to 10% by weight of a sulfonated lignin and from 3% to 90% by weight of an aromatic sulfonic acid or a soluble compound obtained by condensing formaldehyde or its equivalent with an aromatic sulfonic acid.
Claims2
A low viscosity, heat stable dye dispersant composition having reduced tendency to stain fibers consisting of,
- (a) from 97% to 10% by weight of said composition of a sulfonated kraft lignin, and
- (b) from 3% to 90% by weight of said composition of a formaldehyde condensed naphthalene sulfonate.
Dependencies are inferred from the claim text.