Patent ID: 6872766
Filing Date: 2005-03-29
Classification: C09K,G02B

Abstract:
1. A self-bearing ultraviolet light absorbing polymer film, coating, or molded article UV filter element comprising a cellulose ester polymer phase having molecularly dispersed therein a) a first ultraviolet absorbing dibenzoylmethane compound of formula (I) where R1 through R5 are each independently hydrogen, halogen, nitro, or hydroyxl, or further substituted or unsubstituted alkyl, alkenyl, aryl, alkoxy, acyloxy, ester, carboxy, alkyl thio, aryl thio, alkyl amine, aryl amine, alkyl nitrile, aryl nitrile, arylsulfonyl, or 5-6 member heterocycle ring groups, wherein each of R1 through R5 comprises 20 or fewer carbon atoms, and b) a second ultraviolet light absorbing compound which absorbs ultraviolet light at a wavelength for which the first compound is deficient at absorbing.