Patent ID: 7803857

Claim:
Biaxially oriented mono- or multilayered polyester film comprising (i) polymer consisting of polyester and, optionally, up to 20% by weight of polyamide or polyetherimide and (ii) at least one UV stabilizer according to formula (I): wherein R 1 is —H, —C1-C12-alkyl, -aryl, —S—(C1-C12)-alkyl or —O—R 9 or —O—(C1-C5)-alkylene-C(O)O—R 9 , wherein R 9 is -aryl or —C1-C12-alkyl, R 3 and R 4 are and R 2 , R 5 , R 6 , R 7 and R 8 independently from each other represent —H, —(C1-C12)-alkyl, —O—(C1-C12)-alkyl, -aryl or —O-aryl, wherein said alkyl radicals with more than two C-atoms and alkylene radicals with more than one C-atom can be linear or branched.