CONDENSATION PRODUCTS OF MELAMINE, GLYOXYLIC ACID AND GLYOXAL; LEATHER TANNING PROCESS

摘要

A tanning assistant useful in particular for tanning in combination with aluminum tanning agents is obtained by condensing melamine with glyoxal and/or glyoxylic acid and optionally with an aromatic compound which has a phenolic hydroxyl group or optionally with a condensable nitrogen compound.