Patent ID: 6855435

Claim:
A transparent, biaxially oriented film having a thickness of 1 to 500 μm, which comprises a crystallizable thermoplastic, at least one UV stabilizer, and a bisbenzoxazole, a phenylcoumarin, a bisstyrylbiphenylene, or a mixture thereof as optical brightener in an amount of from 10 to 50,000 ppm based on the weight of the layer to be provided with these, wherein the film retains a surface gloss, measured according to DIN 67530 and using a measurement angle of 20°, of from 131 to 152, and wherein the film retains a luminous transmittance, measured according to ASTM D 1003, of from 84.3% to 92.3%, wherein the film retains the gloss and luminous transmittance when weathered to the test specification of ISO 4892 for 1000 hours per side using an Atlas Ci 65 Weather-Ometer.