TWO-PACK TYPE THERMOSETTING RESIN COMPOSITION, METHOD OF FORMING COATING FILM, AND COATED ARTICLE

摘要

The curing time of a curable acid/epoxy type coating material is significantly reduced (especially halved) and, other performances (especially film performance) are further improved. The two-pack type thermosetting resin composition comprises: (a) an acid hydride group-containing acrylic resin which is obtained by copolymerizing an acid anhydride group-containing ethylenic monomer with an ethylenic monomer containing no acid anhydride group and has an acid anhydride group content of 0.08-5.3 mmol/g (on a solid basis) and a number average molecular weight of 500-8,000; (b) a carboxylated polyester resin which is obtained by reacting a polyester polyol having three or more hydroxy groups with an acid anhydride group-containing compound and has a carboxy content of 0.8-6.3 mmol/g (on a solid basis), a number-average molecular weight of 400-3,500, and a weight-average molecular weight/number-average molecular weight of 1.8 or lower; and (c) an acrylic resin having hydroxy and epoxy groups which is obtained by copolymerizing a hydroxylated ethylenic monomer, an epoxidized ethylenic monomer, and an ethylenic monomer having neither hydroxy group nor epoxy group and has a hydroxy content of 0.08-5.4 mmol/g (on a solid basis), an epoxy group content of 1.2-10.0 mmol/g (on a solid basis), and a number-average molecular weight of 200-10,000.