| 摘要 |
A one-can thermosetting resin composition comprising (1) a polyester polyol obtained by allowing an aliphatic dicarboxylic acid to react with an aliphatic glycol and polyol having at least three functional groups and (2) a blocked product of alpha , alpha , alpha ' alpha '-tetramethyl-xylylene diisocyanate or 4,4'-methylene bis (cyclohexyl isocyanate), or a blocked product of an NCO-terminated prepolymer obtained by allowing alpha , alpha , alpha ' alpha '-tetramethylxylylene diisocyanate and/or 4,4'-methylene bis(cyclohexylisocyanate) to react with an active hydrogen compound, gives tough coating films in yellowing and thermal degradation, and also exhibits increased hardness as well as high flexibility, stain resistance and chemical resistance. Especially, when the resin composition is used for preparing precoated metals, it gives good steel plates, thus being advantageously utilized for, among others, light electric appliances. |
