Patent ID: 7014797

Claim:
A high clarity thermoplastic polyester article having a relatively high light transmission in the visible light range of 450 nm, and a relatively low light transmission in the Ultraviolet (UV) light range of 390 nm, said composition comprising: at least one ultraviolet absorber compound, said ultraviolet absorber compound being dispersed in said polyester article in a concentration loading level, said ultraviolet absorber compound exhibiting ultraviolet absorption characteristics over the range of wavelengths from 300 to 400 nm; said article exhibiting a UV light transmission when exposed to UV radiation of at most 10% T at the 390 nm wavelength for a loading level of 2000 ppm or less for an article of a thickness of 17 mils; wherein said at least one compound exhibits an extraction level of at most about 0.1 absorbance units, said extraction level being measured from said thermoplastic article as the level of absorbance exhibited by a heated alcohol extract solution after 2 hours exposure, said absorbance being measured within a cell of ten (10) cm in optical length; wherein said high clarity thermoplastic polyester article exhibits visible light transmission value in the range of at least 20% T to about 86.8% T at 450 nm for an article having a thickness of 17 mils.