To provide a water-dispersible urethane prepolymer that can obtain a coating film excellent in oil resistance, hydrolysis resistance, weatherability, bending process properties, and self repair properties, and to provide a resin.
The water-dispersible urethane prepolymer is a reaction product of (a) an organic isocyanate, (b) polycarbonate diol, and (c) a compound that has one hydrophilic center and at least two isocyanate reactivity groups, wherein the polycarbonate diol (b) is polycarbonate diol that has a repeating unit shown by Formula (A) and a terminal hydroxyl group, 60-100 mol% of the repeating unit shown by the formula (A) is a repeating unit shown by Formula (B): -O-(CH2)5-O-CO- or Formula (C): -O-(CH2)6-O-CO-, the proportion of the repeating unit shown by Formula (B) and the repeating unit shown by Formula (C) is 70:30-30:70 (molar ratio), and the primary terminal OH ratio is 95-99.5%. In the formula (A), R in the formula denotes a 2-15C bivalent fatty acid or alicyclic hydrocarbon.
JPH0539340A | 1993-02-19 |
WO2009063768A1 | 2009-05-22 |
Hideto Asamura
Hajime Asamura
Kameoka Mikio
Katsunori Ando
Yuichiro Asano
Yoichiro Uemura
Makoto Tatsumi
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