| abstract |
(57) [Summary] [Purpose] To obtain a coated metal sheet with high hardness, excellent stain resistance, chemical resistance and weather resistance. [Structure] The average number of functional groups is 2.1 to 2.6, the number average molecular weight is 8000 to 22000, and the glass transition temperature is 0 to 30. -° C polyester resin (A), methylated methylol melamine resin (B), butylated methylol melamine resin (C), acid catalyst (D), and amine compound (E) coating composition for coated metal plates as essential components Is applied on a metal plate and cured and dried. The polyester resin (A) contains trimethylolpropane and a combination of one or more kinds selected from butylene glycol, pentanediol and hexanediol as a glycol component, and does not contain ethylene glycol and diethylene glycol. It is preferable. |