One-pack type thermosetting polyurethane coating composition

摘要

Disclosed are a thermosetting polyurethane coating composition of one-pack type which comprises a product obtained by reacting (i) an isocyanate component having at least one oxadiazinetrione ring obtained by the reaction of bis(isocyanatomethyl)cyclohexane with carbon dioxide with (ii) a polyol component having a molecular weight of 400 to 50,000 at such a proportion as satisfying the relations: the number of hydroxyl group > the number of free isocyanate group and the number of oxadiazinetrione ring/(the number of hydroxyl group-the number of free isocyanate group)=0.1 to 10 and a process for producing the coating composition. The composition has excellent storage stability and the cured coatings have no problems of yellowing and pin-holes and are excellent in mechanical properties, chemical resistance and weather resistance.