Amine salts of lignosulfonates
First Claim
1. A printing ink composition comprising a printing paste gel and, as an additive therein, a sulfomethylated lignin amine salt prepared according to the steps of:
- (a) ionizing the phenol component of a lignin material in alkaline liquid medium;
(b) methylolating the lignin material in the ortho position of the phenol component;
(c) lowering the pH of the liquid to an acid pH to precipitate the methylolated lignin material;
(d) washing the precipitated lignin material with water to remove inorganic salts and residual reactants therefrom; and
(e) reacting the washed, purified methylolated lignin material with an amine compound and a sulfur-oxygen-containing compound in liquid medium to produce sulfomethylated lignin amine salt.
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Abstract
Disclosed is a method for the production of a sulfomethylated lignin amine salt from the lignin by-product of the black liquor residue of a kraft pulping process and the use of lignin amine salts as additives in other chemical compositions. The lignin amine salt is produced by precipitating lignin from the block liquor and reacting the precipitated lignin slurry with formaldehyde. Thereafter, the lignin slurry is acidified to a pH of about 2 to 3 and water-washed to remove inorganic salts and other impurities therefrom. The washed methylolated lignin is reacted with an organic amine and a sulfur-oxygen-containing compound, such as sulfur dioxide to form the sulfomethylated lignin amine salt.
The sulfomethylated lignin amine salt products are disclosed as an additive in dyestuff and printing ink compositions, as well as a sequestrant in pesticide compositions, with improved results over certain lignin salts heretofore employed as additives in such compositions.
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Citations
6 Claims
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1. A printing ink composition comprising a printing paste gel and, as an additive therein, a sulfomethylated lignin amine salt prepared according to the steps of:
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(a) ionizing the phenol component of a lignin material in alkaline liquid medium; (b) methylolating the lignin material in the ortho position of the phenol component; (c) lowering the pH of the liquid to an acid pH to precipitate the methylolated lignin material; (d) washing the precipitated lignin material with water to remove inorganic salts and residual reactants therefrom; and (e) reacting the washed, purified methylolated lignin material with an amine compound and a sulfur-oxygen-containing compound in liquid medium to produce sulfomethylated lignin amine salt. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification