Patent ID: 8110282

Claim:
A laminated film comprising a structure where each 30 layers or more of a layer-composed of a polyethylene terephthaltate or polyrthylene naphthalate resin A (A layer) and a layer composed of polyester resin containing spiroglycol B (B layer) are alternately laminated, wherein a relative reflectance in a wavelength range of 400 nm to 1000 nm is 30% or more, tensile stresses at 100% elongation in a longitudinal direction and a width direction of the film are 3 MPa or more and 90 MPa or less in a tensile test at 150° C., and the number of layers with a layer-pair thickness of 10 nm or more and less than 220 nm is more than the number of layers with a layer-pair thickness of 220 nm or more and 320 nm or less.