The invention relates to linear carboxy-functional organosiloxane compounds of the general formula (I) ##STR1##

in which

  • a is from 1 to 200,
  • R1 are identical or different aliphatic or aromatic hydrocarbon radicals and
  • R2 is —(Y)[O(C2H4-b(R3)bO)c(CdH2dO)e]fX,

    and the use thereof for the treatment of the surface of leather.

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