Use of ester urethanes for retanning

Details Use of ester urethanes for retanning Use of ester urethanes for retanning

1994-09-20

1995-05-23

Willis, Jr., Prince

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9422, 8 9423, 8 9433, C14C 318, C14C 328

Patent

active

054177235

ABSTRACT:
The present invention relates to a process for retanning chrome-tanned leather comprising applying to leather a reaction product of
(a) at least one glycerol monoester of a saturated C.sub.12-18 monocarboxylic acid,
(b) at least one diisocyanate selected from the group consisting of toluene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate, and
(c) dimethylolpropionic acid,
wherein
(i) the components (a), (b) and (c) are so selected that the molar ratio of the isocyanate groups of component (b) to the sum of the hydroxyl groups of components (a) plus (c) is about 0.5 to about 1.05 and
(ii) the molar ratio of compound (c) to compound (a) is about 0.7 to about 1.5 and wherein
(iii) the carboxyl groups originating from compound (c) are at least partly neutralized.

REFERENCES:
patent: 4096127 (1978-06-01), Schurmann et al.
patent: 4106897 (1978-08-01), Traubel et al.
patent: 4106898 (1978-08-01), Traubel et al.
patent: 4527992 (1985-07-01), Friese et al.
patent: 4601951 (1986-07-01), Fertell et al.
patent: 5124181 (1992-06-01), Schaffer et al.
patent: 5306435 (1994-04-01), Ishikawa et al.

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