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US 6,855,435 B2Granted
Transparent, UV-stabilized film made from a crystallizable thermoplastic
AssigneeMitsubishi Polyester Film GmbH
InventorsUrsula Murschall, Guenther Crass, Guenter Bewer, Klaus Oberlaender
Life of this patent
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Abstract
A transparent film whose thickness is in the range from 1 to 500 μm and which comprises, as principal constituent, a crystallizable thermoplastic, wherein the film comprises at least one UV stabilizer as light stabilizer and at least one optical brightener, and to the use of the film, and also to a process for its production.
Claims26
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.
Dependencies are inferred from the claim text.