Bisulfite-blocked polyisocyanates as tanning agents

Details Bisulfite-blocked polyisocyanates as tanning agents Bisulfite-blocked polyisocyanates as tanning agents

1995-06-01

1997-04-08

Dodson, Shelley A.

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9421, 8 9433, 424 59, 424 7808, 528 77, C14C 322, A61K 742, C08G 1852

Patent

active

056183178

ABSTRACT:
The present invention relates to tanning agents containing carbamoyl sulfonate groups that are prepared by the reaction of
(A) organic polyisocyanates,
(B) 0.01 to 0.4 equivalents, relative to the isocyanate groups of polyisocyanate (A), of polyether alcohols having incorporated polyalkylene oxide units (the equivalents of the polyether alcohol being based on the hydroxyl groups), wherein 40 to 100 mole-% of the polyalkylene oxide units consist of polyethylene oxide units having a sequence length of 5 to 70,
(C) optionally, NCO-reactive components other than polyether polyol (B), and
(D) ammonium or alkali bisulfites or disulfites.

REFERENCES:
patent: 2923594 (1960-02-01), Lieberman et al.
patent: 2941859 (1960-06-01), Fein et al.
patent: 4106898 (1978-08-01), Traubel et al.
patent: 4413997 (1983-11-01), Milligan et al.

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