| abstract |
A water-dispersed polyurethane composition essentially containing a polyisocyanate component (a), a polyol component (b) and water is characterized in that at least an isocyanate compound represented by the general formula (I) below is used as the polyisocyanate component (a). Such a water-dispersed polyurethane composition is excellent in adhesiveness, water resistance, corrosion resistance, heat resistance, weather resistance, water repellency, oil repellency and the like, and can be preferably used as a coating composition for surface-treated steel sheets. (In the formula, R1 represents an alkyl group having 10-30 carbon atoms; R2 represents -N=C=O or a group expressed as (II); and A represents a residue obtained by removing two -N=C=O from a diisocyanate compound.) |