BIAXIALLY STRETCHED LAMINATED POLYESTER FILM, INFRARED-RAY-SHIELDING STRUCTURE FOR LAMINATED GLASS WHICH COMPRISES SAID FILM, AND LAMINATED GLASS COMPRISING SAID FILM OR SAID STRUCTURE

摘要

Provided are a biaxially stretched laminated polyester film having both a high near-infrared shielding performance and excellent processability into a laminated glass; and a laminated glass composed of the same. Specifically, the invention is achieved by a biaxially stretched laminated polyester film including 51 layers or more in total, in which a first layer and a second layer are alternately laminated, wherein a polyester (A) constituting the first layer is polyethylene-2,6-naphthalenedicarboxylate; a polyester (B) constituting the second layer is a polyester containing at least one of an ethylene terephthalate component and an ethylene naphthalene dicarboxylate component; an average reflectance within a wavelength range of 400 to 750 nm is not more than 25%; an average reflectance within a wavelength range of 800 to 1,200 nm is 50% or more; and a Young's modulus of the film at 90°C is 2,400 MPa or more in at least one direction of the longitudinal direction and the lateral direction of the film.