Tanning with carboxylic acid carrying ester, urethane and/or ami

Details Tanning with carboxylic acid carrying ester, urethane and/or ami Tanning with carboxylic acid carrying ester, urethane and/or ami

1977-05-31

1978-11-21

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9427, C14C 306

Patent

active

041264134

ABSTRACT:
In the tanning or re-tanning of a hide with a tanning composition comprising a tanning-active substance and at least one of a Cr(III) salt, a dicarboxylic acid, a dicarboxylic acid salt, an emulsifier and an acid-binding agent, the improvement which comprises employing as said tanning-active substance a carboxylic acid carrying at least one of an ester, urethane or amide group. Advantageously the agent has at least two carboxyl groups per molecule and a molecular weight of about 170 to 30,000, preferably 310 to 10,000. The products are softer and better through-tanned and there is maximum utilization of chromium, thereby minimizing the waste disposal problem.

REFERENCES:
patent: 2205883 (1940-06-01), Graves
patent: 4042321 (1977-08-01), Backer et al.
Journal of the International Society of Leather Trades' Chemists, 1943, 27, pp. 83-84.

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