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 {HEAD ~ vapor phase}, because it is high in purity, excellent in dispersibility to {TAIL ~ a coated layer}, large in surface area and excellent in adsorbing function of 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 { HEAD ~ vapor phase } , because it is high in purity , excellent in dispersibility to { TAIL ~ a coated layer } , large in surface area and excellent in adsorbing function of water molecules
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