Aqueous polyurethane dispersion

摘要

The present invention relates to isocyanate functional prepolymers, aqueous polyurethane dispersions produced from the prepolymers and various uses of such dispersions. The prepolymers are prepared by reacting a diisocyanate, a dihydroxy compound having a number average molecular weight of from about 700 to about 16,000, and a trihydroxy component of the formula:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ R-(OH) 3
where R is a saturated straight chain or branched chain aliphatic group of from 2 to 8 carbon atoms. The invention also relates to polyurethane dispersions prepared from the prepolymers and to various uses of the resultant dispersions.