2???-dihydroxy-4,4???-dimethoxybenzophenone, phenyl salicylate and methyl salicylate. [0195] In the present invention, at least one of these UV absorbers is preferably employed, and more than two different UV absorbers may be incorporated in combination. [0196] Methods for adding UV absorbers are those in which UV absorbers are dissolved in organic solvents such as alcohol, methylene chloride, dio