Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1974-07-05
1977-02-08
Sebastian, Leland A.
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
8 79, 8173, 252353, 260124R, 260124A, C09B 6700, C07G 108
Patent
active
040070042
ABSTRACT:
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.
REFERENCES:
patent: 2729534 (1956-01-01), Ehrensperger
patent: 3156520 (1964-11-01), Blaisdell
patent: 3726850 (1973-04-01), Detroit
patent: 3763139 (1973-10-01), Falkehag
patent: 3769272 (1973-10-01), Hintz
patent: 3864276 (1975-02-01), Benko
Bailey, III Carl W.
Dilling Peter
Lipscomb III Ernest B.
Schmalz Richard L.
Sebastian Leland A.
Westvaco Corporation
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