To provide a polyurethane dispersion which has an improved standard of carboxylate functionality and gives a coating that has a film rigidity, a flexibility, a good water resistance, a good abrasion resistance, and an excellent solvent resistance and to provide a coating composition using it.
This polyurethane dispersion is obtained by (A) preparing an isocyanate-functional prepolymer having an acid functional group by reacting a first polyol, a second polyol having a carboxylic acid functional group and polyisocyanate and (B), in short, reacting this prepolymer and an amino acid. The coating composition contains the polyurethane dispersion as a first component (i) and a second component (ii) containing a crosslinking agent for polyurethane that does not contains free isocyanate groups.
ROESLER RICHARD R
KONITSNEY RONALD M
Yasuo Shibata
Kenichi Morizumi