Water-based coating composition and its use for preparing flexible coatings

PURPOSE: To provide a water-based coating composition for preparing elastic fillers by using a composition comprising water-soluble or water-dispersible polyol components and water-soluble or water-dispersible polyisocyanate components as its binding agent. CONSTITUTION: This thermo-crosslinkable water-based coating composition contains a binder having (A) a water-soluble or water-dispersible polyol component and (B) a water-soluble or water-dispersible polyisocyanate component, wherein the component (B) has an average NCO functionality of 2.0 to 2.6 and is composed of the reaction product of (a) a polyisocyanate mixture having an average NCO functionality of 2.5 to 3.5 and containing at least 15 wt.% of organic dissocyanate, (b) a blocking agent for isocyanate groups in the amount of 50 to 80 equivalent-% based on the NCO groups of component-(a) and (c) aliphatic monohydroxymonocarbonic acid in the amount of 20 to 50 equivalent-% based on the NCO groups of component-(a) and the OH groups of component-(c), and wherein the equivalent ratio based on the isocyanate-reactive groups of component-(b) and the hydroxyl groups of component-(c) to the isocyanate groups of component-(a) is at least 0.9:1. COPYRIGHT: (C)1994,JPO