Patent ID: 7262255

Claim:
A two-component water-based paint system, comprising: a polyester resin component (A) that is an aqueous emulsion of a hydroxy-functional polyester resin, which does not contain any ethylenically unsaturated monofunctional carboxylic acid moieties, and which is obtained by reaction of a composition, which comprises (i) at least one low-molecular polyvalent alcohol having at least two hydroxyl groups per molecule, (ii) at least one polyether polyol, (iii) at least one monofunctional saturated aliphatic, cycloaliphatic or aromatic carboxylic acid, and (iv) at least one polycarboxylic acid having at least two carboxyl groups; and an isocyanate component (B); the polyester resin component (A) and the isocyanate component (B) being provided as separate components suitable for mixing together by an applicator for application to a substrate, the resulting mixture having a pot life such that the mixture must be applied to the substrate before the hydroxy-functional polyester resin and the isocyanate component have fully reacted, wherein the resin is additionally modified by reaction with isocyanate prior to mixing the polyester resin component (A) and the isocyanate component (B) to form a mixed paint system.