TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Property: The plate-shaped inorganic compound has particle size of 0.1 mu m or more. The cured coating film containing polyester polyol (A) and polyisocyanate (B) with application quantity of 5 g/m2 or less, has oxygen permeability of 50 cc/m2.day.atm at 23 degrees C and humidity of 90%.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The content of glycerol residue of polyester polyol (A3) (I) is 5 %mass or more in polyester resin composition. The polyvalent carboxylic acid component is ortho-orientated aromatic dicarboxylic acid or its anhydride, orthophthalic acid or its anhydride, naphthalene-2,3-dicarboxylic acid or its anhydride, naphthalene-1,2-dicarboxylic acid or its anhydride, anthraquinone-2,3-dicarboxylic acid or its anhydride and/or 2,3-anthracene-dicarboxylic acid or its anhydride. The content of ortho-orientated aromatic dicarboxylic acid or its anhydride is 70-100 %mass with respect to components of polyhydric carboxylic acid. Preferred Process: The resin composition is obtained by dissolving polyester polyol in mixed solvent containing ketone-type solvent and/or ester solvent.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polyester polyol (A) has an aromatic ring. Preferred Process: The polyester polyol (A) is polyester polyol (A1) having at least one carboxy group and 2 or more hydroxyl groups obtained by reacting carboxylic anhydride or polycarboxylic acid with polyester polyol having 3 or more hydroxyl groups, polyester polyol (A2) having a polymerizable carbon-carbon double bond in a molecule, polyester polyol (A3) of formula: R2-O-CH2-C(-O-R1)H-CH2-O-R3 (I), polyester polyol (A4) obtained by polycondensing polyhydric-alcohol component chosen from ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol and cyclohexanedimethanol, and ortho-orientated aromatic dicarboxylic acid or its anhydride as polyvalent carboxylic acid component, or polyester polyol (A5) having an isocyanuric ring of formula (III). The polyester polyol (A2) is maleic acid, maleic anhydride or fumaric acid. The content of polyester polyol (A2) is 5-60 parts mass with respect to 100 parts mass of monomer components. The resin composition contains polyisocyanate, isocyanurate derived from monomer (c) chosen from hexamethylene diisocyanate, isophorone diisocyanate and metaxylylene diisocyanate and allophanate as polyfunctional isocyanate compound, or polyester polyol, more than bifunctional polyol compound chosen from trimethylolpropane and glycerol, and monomer (c) or multi-functional polyisocyanate compound or polyisocyanate obtained by reaction of monomer (c) and multi-functional polyisocyanate compound. The polyisocyanate (B) has aromatic ring or aliphatic ring. The polyisocyanate having aromatic ring is reaction product of metaxylene diisocyanate or metaxylene diisocyanate and alcohol having 2 or more hydroxyl groups. The resin composition further contains crystalline polyester, and 5-50 parts mass plate-like inorganic compound which is non-swellable in water with respect to 100 parts mass polyester polyol (A), polyisocyanate (B) and plate-shaped inorganic compound.R1-R3=H or -(C(=O)-X-C(=O)-O-Y'-O)n-H;n=1-5;X=optionally substituted 1,2-phenylene, 1,2-naphthylene, 2,3-naphthylene, 2,3-anthraquinon-diyl or 2,3-anthracen-diyl;R11-R13=-(CH2)n1-OH, or -(CH2)n2-O-(C(=O)-X'-C(=O)-O-Y'-O)n3-H, where at least one of R11-R13 is -(CH2)n2-O-(C(=O)-X'-C(=O)-O-Y'-O)n3-H;n1,n2=2-4;n3=1-5;X'=1,2-phenylene, 1,2-naphthylene, 2,3-naphthylene, 2,3-anthraquinon-diyl, 2,3-anthracen-diyl or optionally substituted arylene;andY'=2-6C alkylene.Preferred Properties: The polyester polyol (A1) has hydroxyl value of 20-250, and acid value of 0-200.