CONDENSATES OF BIS-(4-HYDROXYPHENYL) SULFONE AS TANNING ASSISTANTS, THEIR PREPARATION AND USE IN THE TANNING OF LEATHER

摘要

A product of the condensation of bis(4-hydroxyphenyl) sulphone, an aldehyde, dialdehyde and/or glyoxylic acid and aminoacetic acid or an N-substituted aminoacetic acid is used as a tanning aid in a leather-tanning method using this condensation product in combination, in particular, with aluminium tanning agents.