Method of preparing high activity sulfonated lignin dye...

C - Chemistry – Metallurgy – 08 – H

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C08H 7/00 (2011.01) B01F 17/00 (2006.01) C09B 67/46 (2006.01)

Patent

CA 2215375

Improved dyestuff compositions comprising a dye cake and a dye dispersant are disclosed wherein the dye dispersant comprises sulfonated or sulfomethylated lignin of increased activity and improved heat stability properties and which dispersants are disclosed to be prepared by substantial removal of the low molecular weight component of the sulfonated and sulfomethylated lignin. Exclusion of the low molecular weight portion of the dispersant may be accomplished by fractionation of the sulfonated or sulfomethylated lignin to remove a substantial portion of the molecules having a molecular weight below 3,000. Alternatively, in the case of lignin recovered from sulfate or soda wood pulping processes, the lignin may be fractionated to remove a substantial portion of the molecules having a molecular weight below 3,000 prior to sulfonation or sulfomethylation.

On dévoile des compositions de colorant améliorées comprenant un gâteau de colorant et un dispersant de colorant où le dispersant de colorant comprend de la lignine sulfonée ou sulfométhylée d'activité accrue et de stabilité thermique améliorée; les dispersants sont préparés par élimination substantielle du constituant de faible poids moléculaire de la lignine sulfonée ou sulfométhylée. L'exclusion de la partie de faible poids moléculaire du dispersant peut être réalisée par fractionnement de la lignine sulfonée ou sulfométhylée pour éliminer une partie substantielle des molécules ayant un poids moléculaire inférieur à 3 000. Autre possibilité, dans le cas de la lignine récupérée des procédés de préparation de la pâte au sulfate ou de la pâte chimique à la soude, la lignine peut être fractionnée pour éliminer une partie substantielle des molécules ayant un poids moléculaire inférieur à 3 000 avant la sulfonation ou sulfométhylation.

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