Verwendung Carboxylgruppen-terminierter Di-, Oligo- und/oder Polyester zur fettenden Ausrüstung von Leder

摘要

The invention concerns di-, oligo- and/or polyesters with terminal carboxyl groups, characterized in that a) the alcohol component consists of a1) 50 to 100 % by wt. of dimeric diol and/or trimeric triol, a2) 0 to 50 % by wt. of alkane diols and a3) 0 to 50 % by wt. of polyalkylene glycols and b) the acid component consists of b1) 10 to 100 % by wt. of sulphosucinnic acid and b2) 0 to 90 % by wt. of dicarboxylic acids with 2 to 24 C-atoms and containing no sulphonic groups, the sulphonic-acid and carboxyl groups being present in the ester as the free acid or as the alkali-metal, alkaline-earth, ammonium, alkylammonium or alkanolammonium salt. Such esters are suitable for the oiling-off of leathers. Particular properties of leathers treated with such esters are that they can be washed and dry-cleaned, are resistant to fogging and have good resistance to water. In addition, the esters used have "self-fixing" properties, thus making an additional mineral-salt fixing stage unnecessary.