Multifunctional Amino-Terminated Polyurethanes : Their Preparation and Use as Crosslinkers in Shrink-Resist Polymers for Wool

Abstract

A simple, rapid method for converting water-insoluble polyisocyanates into either water soluble (or water-dispersible multifunctional amino-terminated polyurethanes or self-crosslinkable polymers containing protonated an ino groups and blocked isocyanate groups is descried. Both types of product are suitable for shrink resisting wool, the self-crosslinkable polymers can be used alone, whereas the polyamines need to be combined with poly mers containing groups capable of reaction with amino groups. The effective functionalites of the amino-terminated polyurethanes correlated well with the values calculated from the known functionality of the reactants, which suggests that chain extension via urea formation was suppressed by this preparative procedure.