Curable base-coat composition, method of film-forming and coated articles

摘要

A curable base-coat composition which comprises (1) a resin component essentially consisting of a polymer of an ethylenically unsaturated monomer having 500 to 4,000 of an epoxy equivalent, 10 to 200 of a hydroxyl value, -30 to 80 DEG C of a glass transition temperature and 3,000 to 150,000 of a weight average molecular weight, (2) a curing agent having two or more functional groups in the molecular which can react with the hydroxyl groups of the resin component (1), (3) a Lewis acid catalyst, and (4) a pigment selected from the group consisting of a color pigment and a bright pigment. The curable base-coat composition has adhesive active points to curable clear-coat compositions comprising the acid curing agents blocked chemically and the resins containing epoxy groups or curable clear-coat compositions of the polyol-melamine type and/or the polyol-melamine-polyisocyanate type and gives a cured film having excellent cured film properties. The curable base-coat composition sufficiently exert the excellent characteristics of curable clear-coat compositions.