| abstract |
A thermosetting composition, containing, as essential components, (A) a polyester resin with a number average molecular weight of 1,000-10,000 determined by gel permeation chromatography using the number average molecular weight of polystyrene as standard and an index hydroxy 5-200 mg KOH / g, (B) a blocked aliphatic polyisocyanate compound that has reactivity with the hydroxyl groups of component (A), where the blocks are methyl ethyl ketone oxime and / or ε-caprolactam, and the mixing ratio is in the range of 0.5-2.0 equivalents of blocked isocyanate groups of component (B) relative to hydroxyl groups of component (A), (C) from 0.05 to 5% by mass, relative to the mass of total resin solids of component (A) and component (B), of an organotin compound represented by the following general formula (I) ** Formula ** R1-Sn- (O (C = O) -R2) 3 (I) through a C. R2 atom represent t is an organic group having 1-24 carbons, and is attached directly to the C atom of (C = O) through a C atom, (D) of 0.5 to 50 mass%, relative to the mass of total resin solids of component (A) and component (B), of an organosilicate represented by the following general formula (II) and / or a condensation product thereof [Form. chem. 2] ** Formula ** (R3, R4, R5 and R6 in the formula are each a hydrogen atom or 1-10 carbon organic group, and R4 and R5 may be the same or different, n is 1). |