PROCEDURE FOR RE-TANNING UNDYED CHROME-TANNED LEATHER OR DYED CHROME-TANNED LEATHER, THE AQUEOUS SOLUTION FOR CARRYING OUT THIS PROCESS, AND THE LEATHER THUS RE-TANNED.

摘要

oligomers with structural elements of the formulaand, as appropriate,whatx is - ch - or - coor, oocr conhr, y1 - cooh or coom, y2 - conh2, ch2och, och3 or oc2h5, z - h, - ch3 or - c2hs, m a amine, ammonium or alkyl alkalimetallkation undp,when a person in no more than eight carbon atoms or hydroxyalkyl mean are suitable in a process for retanning of chromgegerbtem leather to be used.the oligomers are the structural elements of the specified mischpolymerisation formulas corresponding comonomere the acrylsu00e4urereihe in the presence of sulphites or hydrogensulfiten researchmy breeze (m) 2 or hs03m manufactured and has an average molecular weight of not more than 14, 000.