Patent ID: 6720385
Filing Date: 2004-04-13
Classification: C08G,C08J

Abstract:
A process for preparing a stable polyurethane latex comprising admixing a polyurethane prepolymer with water, an anionic surfactant, and a chain extender in the absence of an organic solvent under conditions sufficient to disperse the prepolymer and chain extender reaction product to form a latex wherein:(i) the prepolymer is prepared from a prepolymer formulation including an aromatic polyisocyanate component and polyol component, such that the NCO to OH ratio is about 3.2 to about 6.7 and the polyol component has a molecular weight from about 750 to about 8000, (ii) from 5 to 40 percent of the weight of the polyol component is ethylene oxide in the form of ethylene oxide applied as an end cap onto a propylene oxide or higher oxyalkylene polyoxyalkylene polyol, and (iii) no more than 45 percent of the weight of polyol component is ethylene oxide.