Abstract: The invention disclosed herein relates to a method for the preparation of finely dispersed polyurethane ureas. The method comprises the steps of first preparing a chain extended polyurethane from at least one diisocyanate, at least one polydiol, and diol chain extenders. The chain-extender component of the reaction is comprised of low molecular weight diols having side chains or ether groups, unbranched low molecular weight diols and/or monofunctional compounds having an active hydrogen such as the amines, amides or alcohols. The chain extended polyurethane is then treated with a nonionic emulsifier and emulsified first with warm water, and then with cold water. A diamine or a mixture of diamines is then added to the emulsion.

Abstract: The invention described herein relates to a method for preparing a low-melting polyurethane which comprises the reaction of at least one diisocyanate, at least one polyol having a molecular weight between 500 and 5000, at least one diol which is branched or includes an ether group, and at least one diol which is unbranched. The diols have a molecular weight of less than about 500. The hydroxyl group content of the reaction mixture exceeds or equals the isocyanate content of the reaction mixture.