| http://www.w3.org/ns/prov#value | - If the amount used exceeds 80 parts by weight, the ratio of titanium oxide particles buried in the adhesive increases and the photocatalytic activity decreases, whereas if it is less than 10 parts by weight, the effect ascribable to the adhesive addition may not be obtained. [0024] The method for adding the adhesive is not particularly limited but a method of adding an adhesive to a titanium oxide
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