| 摘要 |
A process for the re-tanning of tanned leather or pelt, wherein the tanned leather pelt is re-tanned with (A) a polymeric carboxylic acid, containing alpha -hydroxyacrylic units as constituent units of the polymer, optionally in salt form with the proviso that for this re-tanning (A) is not employed immediately after a mineral tanning, immediately before a mineral re-tanning or after a mineral re-tanning and also not in a direct connection with a mineral after-treatment.
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