Color reduction process for non-sulfonated lignin

Details Color reduction process for non-sulfonated lignin Color reduction process for non-sulfonated lignin

1983-10-31

1984-12-04

Phillips, Delbert R.

Chemistry: natural resins or derivatives; peptides or proteins;

Lignins or derivatives

Aldehyde, ketone or ozone reacted with a lignin or lignin...

C07G 100

Patent

active

044863462

ABSTRACT:
Non-sulfonated lignin color reductions of over 90 percent, and in some cases as high as 95 percent, are achieved by a three-step process involving (1) methylolating or crosslinking the lignin, (2) the blocking of phenolic groups on the lignin molecule with blocking agents followed by (3) oxidation with chlorine dioxide. The light colored lignin dispersants produced by the invention process exhibit very low staining and low azo dye reduction, good heat stability, dye grinding efficiency, and dispersion stability.

REFERENCES:
patent: 2525433 (1950-10-01), Voet
patent: 2680113 (1954-06-01), Adler et al.
patent: 2690973 (1954-10-01), Voet
patent: 3503762 (1970-03-01), Remer
patent: 3672817 (1972-06-01), Falkehag et al.
patent: 3763139 (1973-10-01), Falkehag
patent: 3769272 (1973-10-01), Hintz
patent: 3865803 (1975-02-01), Falkehag
patent: 4184845 (1980-01-01), Lin
K. V. Sarkanen, et al., "Lignins", (1971), 466-469.

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