Process for the retanning of chrome leathers

Details Process for the retanning of chrome leathers Process for the retanning of chrome leathers

C - Chemistry, Metallurgy

14

C

8/68

C14C 3/28 (2006.01) C14C 3/02 (2006.01) C14C 3/06 (2006.01)

Patent

CA 1275755

A process for the retanning of chrome leathers ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the retanning (afterchroming) of chrome leathers. It has been found very high chromium exhaustion of the liquor can be achieved if the leather is retanned with mixtures of, a) chromium (III) salts, b) from 1.0 to 2.5 mol (per mole of Cr2O3 of the used chromium(III) salt) of aliphatic dicarboxylic acids having from 4 to 6 carbon atoms or aromatic dicar- boxylic acids having from 8 to 12 carbon atoms and/or the salts thereof, c) such a quantity of basifying agents, that a theoreti- cal basicily of the used chromium(III) salt of from 80 to about 120% is established, and d) from 150 - 250 g (per mol of Cr2O3 of the used chromium(III) salt) of one or more synthetic tanning agents (syntans),

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