| abstract |
(57) Abstract: The present invention provides an easily adhesive polyester film for optical use. SOLUTION: An optical device comprising, as a base material, a biaxially oriented polyester film having a thickness of 50 μm or more containing an antimony compound, an alkaline earth metal compound, and a phosphorus compound, and a polymer easy-adhesion layer formed on at least one surface of the base material. Polyester as a main material of the base material is substantially free of particles, and has a melting specific resistance at 275 ° C. of the polyester as a main material of the base material of 0.15 to 0.15. 0.45 (× 10 8 Ω · cm), and polyester as a main raw material of the base material is dissolved in a solvent, and the solution is filtered through a membrane filter having an average pore diameter of 0.1 μm. The alkaline earth metal component and the antimony component in the residue are each 1 mg or less per 1 kg of polyester as a main raw material of the base material. Manabu for easy adhesion polyester film. |