Polymeric tanning agent and method of retanning

Abstract

Abstract Retanning of mineral-tanned leather without impairing its dyeing properties by treating it with an aqueous solution of 0.025 to 1% by weight, based on the shaved weight, of a copolymer of a Fikentscher K value within the range from 20 to 150 formed from a) 20 to 80% by weight of acrylamide or methacrylamide, b) 80 to 20% by weight of an amino-containing acrylate of the formula H2C = CH-C(O)X-A-NR2 where A = C2-C5-alkylene R = methyl or ethyl and X = O or NH, c) 0 to 20% by weight of a further monomer which is copolymerisable in aqueous solution, at a liquor length, based on the shaved weight, of 30 to 300%, pH 3-6 and 20-60 DEG C.

Inventors

• 👤 Heinrich Dr. Hartmann
• 👤 Wilfried Dr. Heide
• 👤 Guenter Dr. Eckert
• 👤 France Knaflic
• 👤 Bernhard Dr. Magerkurth

Bibliographic Details