Multilayered film and near-infrared-ray reflection film

Abstract

A multilayer film which comprises a first layer comprising a polyethylene-2,6-naphthalene dicarboxylate and a second layer comprising a thermoplastic resin having a lower refractive index than the polyethylene-2,6-naphthalene dicarboxylate constituting the first layer, wherein: the first and second layers each having a thickness of 0.05 μm to 0.3 μm are laminated alternately so as to form a laminate comprising at least 11 layers, at least either the first layers or the second layers differ in thickness, a value obtained by dividing the thickness of a layer with a maximum thickness by the thickness of a layer with a minimum thickness is not smaller than 1.2, and at least either the laminated first layers or the second layers are stretched at least in one direction. The multilayer film reflects light of given wavelength range selectively and widely. Hence, the film can prevent malfunctions in peripheral devices caused by broadband near infrared light radiated from a display surface of a plasma display, is inexpensive, has a high light transmittance, and is used for a front panel.

Dependencies are inferred from the claim text.