THE PREPARATION PROCEDURE FOR INTERPENETRATING POLYMER NETWORKS (IPNs) MADE FROM FUNCTIONAL PREPOLYMERS, AND THEIR APPLICATION FOR LEATHER FINISHING

摘要

Given is a description of the procedure for preparing interpenetrating polymer networks (IPNs) from prepolymers with incorporated functional groups as well as the procedure for their application on leather surfaces. The procedure enables the preparation of IPNs in the absence of volatile monomers. Polyurethane (PU) prepolymers with carboxylic and polyacrylate (PM) prepolymers with tertiary amine functional groups were used. IPN films were prepared from prepolymer mixtures by casting and crosslinking on a siliconized polypropylene foil. Films were subsequently applied to the leather surface. The procedure via preformed films substantially reduces the emission of organic solvents during leather finishing. Properties of leather finishing