As for the hydrophilic silica applicable to the invention, it is preferable to use silica prepared by a high temperature hydrolysis of silicon chloride compounds in vapor phase, because it is high in purity, excellent in {HEAD ~ dispersibility} to a coated layer, large in surface area and excellent in adsorbing function of {TAIL ~ water molecules} 
As for the hydrophilic silica applicable to the invention , it is preferable to use silica prepared by a high temperature hydrolysis of silicon chloride compounds in vapor phase , because it is high in purity , excellent in { HEAD ~ dispersibility } to a coated layer , large in surface area and excellent in adsorbing function of { TAIL ~ water molecules }
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