Abstract: A powder coating composition according to the present invention is used in the coating of a molded product having wrinkles, cavities and the like in its surface. The powder coating composition contains a single film forming resin or a plurality of film forming resins having a melt viscosity of 60 Pa·s/165° C. or less and selected from the group consisting of an epoxy resin, a polyester resin and an acrylic resin, and at least two fillers having different particle size in a range of 3 to 100 &mgr;m. Thus, the powder coating composition is applied directly onto a to-be-coated-surface without need for a pretreatment such as the sanding of the surface and the filling of the surface by a patty. Therefore, a molding failure of the surface can be hidden satisfactorily to form a coated surface excellent in design. Moreover, an organic solvent or the like is not used, and hence, the air pollution is prevented, and the danger of a fire is reduced remarkably.

Abstract: A polyfunctional polycarbodiimide compound contains at least four molecular chains bonded independently to a backbone. Each of the molecular chains contains a carbodiimido (—N═C═N—) group. The polyfunctional carbodiimide compound can be produced by reacting (a) an isocyanate compound having at least one carbodiimido group and at least one isocyanate group with (b) a polyol, polyamine and/or aminoalcohol having at least four hydroxyl, primary amino and/or secondary amino groups in a molecule. Also disclosed are a resin composition containing the polyfunctional polycarbodiimide compound as a crosslinking agent; and a treatment method of an article, which makes use of the resin composition.

Abstract: A polyfunctional polycarbodiimide compound contains at least four molecular chains bonded independently to a backbone. Each of the molecular chains contains a carbodiimido (--N.dbd.C.dbd.N--) group. The polyfunctional carbodiimide compound can be produced by reacting (a) an isocyanate compound having at least one carbodiimido group and at least one isocyanate group with (b) a polyol, polyamine and/or aminoalcohol having at least four hydroxyl, primary amino and/or secondary amino groups in a molecule. Also disclosed are a resin composition containing the polyfunctional polycarbodiimide compound as a crosslinking agent; and a treatment method of an article, which makes use of the resin composition.