| | Humectant composition derived from kraft black liquor - Patent 4629469 |
 | | Such dyestuff formulations also generally contain a humectant which is employed in the liquid dye paste, or cake, to prevent the dye from drying out, such as may occur around the edges of a dye drum. |
 | | It is an object of the present invention to provide a chemical composition suitable for use as a humectant in dyestuff and other similar chemical formulations which is produced from the fl liquor residue of a kraft pulping process. |
 | | Methylolation of the lignin aromatic ring adjacent to the phenolic group of the fl liquor may be accomplished by treatment with an aldehyde compound, such as formaldehyde (CH.sub.2 O), under sufficient conditions to prepare the lignin for solubilization at neutral and acid pH levels by treatment with the sulfur-oxygen-containing compound. |
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