Westvaco Corporation

Carl W Bailey, Iii

Peter Dilling

Sten I Falkehag

A dyestuff filler material with humectant properties derived from kraft black liquor is disclosed. The process for obtaining the dyestuff filler material involves the acidification of kraft black liquor followed by separation of the precipitated portion, such as by filtration. The filtrate from this separation is then treated to solubilize the remaining portion of lignin, which primarily is low molecular weight lignin. This step is followed by a stabilization step, for example, with air to oxidize the filler material to minimize azo dye reduction.

Dyestuff filler derived from kraft black liquor

The surfactants of this invention are phenolic-formaldehyde resins that have been sulfomethylated with from 1-13 moles of sulfomethylation per 1000 grams of the starting resin and further modified by reaction with up to 20 moles, preferably 0.25 to 10 moles, per 1000 grams of starting resin of a blocking agent of the type X(CHR).sub.m (CH.sub.2).sub.n Y, wherein X is a halogen, an activated double bond, epoxy ring or halohydrin, Y is a property group such as sulfonate, phosphonate, carboxylate or hydroxyl, R is another property group such as hydrogen, hydroxyl, mercaptan or amine, and n and m are integers from 0 to 5, with n or m being at least 1, to at least partially block the phenolic hydroxyl group of the resin. The phenolic-formaldehyde resin may also be cross-linked to tailor its molecular weight and then treated with urea or ammonia, if desired.

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Isle of Palms, SC, United States of America

Carl W Bailey, Iii