TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: The fin material is made of aluminum.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Property: The positively charged nitrogen atom-containing compound has log P value of 0 or less. The positively charged nitrogen atom-containing compound is a low molecular weight compound having molecular weight of 1000 or less, preferably 200-800. Preferred Compound: The positively charged nitrogen atom-containing compound is selected from group of formulae (1-8). The hydrolyzable silyl group is of formula (A or B).R1-R4=hydrocarbon optionally substituted by hydroxyl group and/or silane-coupling group;X=anion;R6-R7,R9=H or hydrocarbon;R8,R10=H or hydrocarbon containing hydroxyl group in terminal and/or side chain;m=0,1 or 2;x,y=more than 0 to less than 100;L1,L3,L4=single bond or organic coupling group;L5=single bound, multivalent organic group selected from group of formula: CONH-, -NHCONH-, -OCONH-, -SO2NH- or -SO3-;Y1,Y3=-OH,-ORa,-CORa, -CO2Re,-CON(Ra)(Rb), -N(Ra)(Rb), -NHCORd,-NHCO2Ra, -OCON(Ra)(Rb), -NHCON(Ra)(Rb), -SO3Re, -SO3Re, -SO2Rd, -NHSO2Rd, -SO2N(Ra)(Rb), -N(Ra)(Rb)(Rc), -N(Ra)(Rb)(Rc)(Rg), -PO3(Re)(Rf), -OPO3(Re)(Rf) or -PO3(Rd)(Re);Ra -Rc=H or alkyl;Rd=alkyl;Re,Rf=H, alkyl, alkali metal, alkaline-earth metal or onium ion;andRg=alkyl, halogen, inorganic anion or organic anion.Preferred Composition: The composition contains 1-30 mass% of positively charged nitrogen atom-containing compound with respect to non-volatile component. The metallic element of the metal complex catalyst is chosen from group-2A, group-3B, group-4A and group 5A of periodic table. The ligand of the metal complex catalyst is chosen from beta -diketone, oxy compound, hydroxy compound, ketoester, hydroxycarboxylic acid or its ester, amino alcohol and active hydrogen compound having enol property. The composition further contains an alkoxide compound containing elements chosen from silicon, titanium, aluminum and zirconium. The composition further contains colloidal silica.    TECHNOLOGY FOCUS - POLYMERS - Preferred Compound: The hydrophilic polymer contains hydrolyzable silyl group in the side chain or terminal of the polymer. Preferred Composition: The composition contains hydrophilic polymer containing hydrolyzable silyl group in the side chain and hydrophilic polymer containing hydrolyzable silyl group in the terminal in the mass ratio of 50:50-5:95. Preferred Process: The composition is coated on a support material, to form a hydrophilic material. EXAMPLE - A sol-gel was prepared by reacting (in g) ethyl alcohol (200), acetylacetone (10), tetraethyl orthotitanate (10), water (100), tetramethoxysilane (8), hydrophilic polymer of formula (C) (4) and nitrogen-containing compound of formula (D) (5) at room temperature for 2 hours. The obtained sol-gel (500) was mixed with water (450), to obtain hydrophilic layer coating liquid. The obtained coating liquid was coated on a glass plate, dried at 100 degrees C for 10 minutes, to obtain hydrophilic material. The obtained hydrophilic material had excellent fog preventing property, ink-proof property, rinse-proof property, adhesiveness, weather resistance, water resistance and antibacterial property.