Lignin by-products of paper-making process

Details Lignin by-products of paper-making process Lignin by-products of paper-making process

1987-04-13

1988-04-26

Nielsen, Earl

Chemistry: natural resins or derivatives; peptides or proteins;

Lignins or derivatives

Compound containing nitrogen attached directly or indirectly...

530500, C07G 100

Patent

active

047405910

ABSTRACT:
A method of producing a lignin by-product of the black liquor residue of a kraft pulping process having improved water-solubility in amine salt form wherein the lignin precipitate of the black liquor residue is water-wash purified and maintained at moderately acid pH of no lower than about 5. The lignin may then be combined in aqueous slurry with an organic amine, such as monoethanolamine, to provide a highly stable aqueous solution of the amine salt of the lignin. The water-soluble lignin salt is particularly suited for use as an additive in water-based pigment printing compositions. The lignin amine salt functions as a grinding agent for the pigment in formulating and as a binder for the pigment in the printing process.

REFERENCES:
patent: 2802815 (1957-08-01), Doughty
patent: 2828297 (1958-03-01), Giesen
patent: 2949448 (1960-08-01), Toppel
patent: 3048576 (1962-08-01), Ball et al.
patent: 4007004 (1977-02-01), Bailey et al.

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