To obtain an organic solvent-based thermosetting coating material composition capable of forming, even after a long term storage, a hard coating film which has a Tukon hardness of at least 15 (at 20°C) and excellent resistance to stains and is easy to remove pollutants adhering thereto, and to provide a method for forming a multi-layered coating film.
The objective thermosetting organic solvent-based coating material comprises (A) a compound having at least two alicyclic epoxy groups in the molecule and a number average mol.wt. of less than 2,000, (B) an acrylic resin containing epoxy groups and hydroxyl groups and having a number average mol.wt. of 2,000-50,000, a hydroxyl value of 10-150 mg KOH/g and an epoxy equivalent of not more then 220, (C) colloidal silica, (D) a thermally latent cationic polymerization catalyst and (E) a tetraalkylammonium salt, the molar ratio of epoxy groups in the component (A) to those of the component (B) ranging from 1:1 to 1:0.05.
SUGIURA KAZUTOSHI
HORIBE KYOICHI
AIDA AKIHIKO
OBATA SEIJI
