WATER-BASED POLYURETHANE DISPERSIONS AND THEIR PREPARATION

A prepolymer comprising acid functionality is made by a process comprising the step of contacting: (i) a di-isocyanate, (ii) a diol containing an acid group, and (iii) a polyol without an acid group, the contacting conducted under reaction conditions and in a solvent consisting essentially of diprop...

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Bibliographische Detailangaben
Hauptverfasser: Joseph, Kristeen Esther, Ku, Sung-Yu, Wiles, Heather M
Format: Patent
Sprache:eng
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Zusammenfassung:A prepolymer comprising acid functionality is made by a process comprising the step of contacting: (i) a di-isocyanate, (ii) a diol containing an acid group, and (iii) a polyol without an acid group, the contacting conducted under reaction conditions and in a solvent consisting essentially of dipropylene glycol dimethyl ether. The prepolymer is useful in the preparation of water-based polyurethane dispersions.