Tanning agent, its preparation and its use for retanning

Details Tanning agent, its preparation and its use for retanning Tanning agent, its preparation and its use for retanning

1981-06-30

1983-06-28

Bleutge, John C.

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9421, 252 857, 525473, 525491, 525495, 525499, 525515, 528129, 528150, 528158, 528161, 528263, 528265, 528266, C14C 318, C08G 1208, C14C 316, C07C10148

Patent

active

043903401

ABSTRACT:
Mineral tanned leather is frequently retanned with synthetic tanning agents to improve the fullness and softness, but leather retanned by the prior art methods is difficult to dye in full shades with anionic dyes. According to the invention, condensation products of C.sub.1-4 aldehydes with certain aromatic sulfonic acids or carboxylic acids containing amino groups are employed for retanning, thereby improving the receptivity of the leather for anionic dyes. These acids have the general formula ##STR1## where X and X' are independently H, --CH.sub.2 --SO.sub.3 H or --CH.sub.2 --OH, A is a benzene radical, Y and Z are independently H, --SO.sub.3 H or --CO.sub.2 H, R is H or C.sub.1-4 -alkyl and n is from 0 to 10, with the proviso that at least one sulfonic acid or carboxyl group is present in the molecule.

REFERENCES:
patent: 1222033 (1917-04-01), Romer
patent: 2282536 (1942-05-01), Swain
patent: 3206435 (1965-09-01), Heyden et al.
patent: 3852374 (1974-12-01), Erdmann et al.
patent: 3899468 (1975-08-01), Rotts

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