| abstract |
Ultraviolet light absorbing polymer film, coating, or molded articlenUV filter elements are described which comprise a polymer phase havingnmolecularly dispersed therein a) a first ultraviolet absorbing dibenzoylmethanencompound of formula (I)n nwhere R1 through R5 are each independently hydrogen, halogen, nitro, ornhydroyxl, or further substituted or unsubstituted alkyl, alkenyl, aryl, alkoxy,nacyloxy, ester, carboxyl, alkyl thio, aryl thio, alkyl amine, aryl amine, alkylnnitrile, aryl nitrile, arylsulfonyl, or 5-6 member heterocylce ring groups, and b) ansecond ultraviolet light absorbing compound which absorbs ultraviolet light at anwavelength for which the first compound is deficient at absorbing. In particularnembodiments, the second ultraviolet light absorbing compound may comprise anhydroxyphenyl-s-triazine, hydroxyphenylbenzotriazole, formamidine,nbenzoxazinone, or benzophenone compound. In a specific embodiment of theninvention, the above UV absorbing compounds are employed in cellulose acetatenfilm for the fabrication of a protective film for polarizers for use in displaynapplications. |