TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Film: The hole diameter of the micropore is 20 nm to 5 microns. The micropore pattern is period structure pattern of micropore. The micropore pattern is in the shape of closest packing or honeycomb form. The inorganic oxide is obtained by sol-gel reaction.The inorganic oxide is an oxide of silicon, titanium, zirconium, aluminum and/or zinc. 40-95 mass% of inorganic oxide is present in the composite coating film. The composite coating film is obtained by applying sol-form aqueous-paint composition on a base material and volatilizing the volatile component.The aqueous-paint composition is formed by mixing copolymer having polyamine segment, metal alkoxide and aqueous medium. The metal alkoxide is alkyl alkoxysilane having alkoxy silane or reactive group. The mass ratio of the copolymer and metal alkoxide is 60/40-5/95.    TECHNOLOGY FOCUS - POLYMERS - Preferred Segment: The polyamine segment is a polymer segment chosen from polyalkylene imine, polyvinyl amine, polyallyl amine, polyvinyl pyridine, polyamino alkyl methacrylate, polyamino alkyl acrylate, polyamino alkyl acrylamide, polyamino alkyl methacrylamide and/or polyamino alkyl styrene. 2-70 mass% of polyamine segment is present in the copolymer.The copolymer has a hydrophobic segment chosen from polystyrene, polyacrylate, polymethacrylate and/or epoxy resin. The copolymer forms an aggregate in the aqueous medium. EXAMPLE - Polyethylene oxide of number average molecular weight 2000 (in g) (15), chloroform (25) and pyridine (6) were introduced into a flask substituted with nitrogen. The obtained solution was mixed with tosyl chloride (7.15). Chloroform (25) was added for 30 minutes, cooled and stirred at 40degreesC for 4 hours. Chloroform (50) was added.    The obtained solution was washed and dried to obtain a precursor polymer (12) whose terminal of polyethylene oxide was tosylated. The obtained precursor polymer (3.5), 2-methyl-2-oxazoline (3.8) and N,N-dimethyl formamide (30 ml) were added into a reaction container maintained in nitrogen atmosphere. Stirring was performed for 8 hours at 100degreesC.    The obtained reaction solution was dripped into a solution of hexane and ethyl acetate, filtered, washed and dried, to obtain a block-shaped polymer (4.8) consisting of polyethylene oxide chain and poly(N-acyl ethylene imine) chain. Hydrochloric acid aqueous solution (11.2) was added to the obtained polymer and stirred at 90degreesC for 6 hours. Acetone (200 ml) was added to the reaction solution after cooling to room temperature. Filtration was performed followed by drying to obtain a block copolymer (X-1) of polyethylene imine hydrochloride and polyethylene oxide. The obtained copolymer (X-1) (0.05) and polyvinyl alcohol (0.04) of average degree of polymerization 500, were dissolved in pure water (9.1 ml).    Tetramethoxysilane (0.26) was added and stirred to obtain a transparent homogeneous liquid. The obtained solution was aged for 1 hour, to obtain an aqueous coating composition. The obtained composition was applied on a glass and dried for 30 minutes at 80degreesC, to obtain a colorless and transparent coating film of thickness about 2 microns. The obtained coating-film surface had micropore pattern having average hole diameter of about 0.68 microns and average depth of about 160 nm.