A waterborne aliphatic polyurethane (WPU) dispersion was synthesized by the reaction of epoxy resin with polyester-diol, glycerol, dimethoxypropionic acid (DMPA) and isophorone diisocyanate (IPDI). The effect of the epoxy value and the amount of epoxy resin, the kind and the amount of the chain-extender and n(NCO)/n(OH) on the properties of the WPU were investigated. The results showed that when the amount of E-44 was 6% -8%, the amount of EDA was 1% n(NCO):n(OH) = (1.5 -1.8):1, the WPU with good water-resistance, st...