Patent ID: 8053062

Claim:
A biaxially drawn multilayer laminated film composed of a plurality of first layers and a plurality of second layers alternately laminated to a total layer number of 11 or more and subjected to biaxial drawing, provided that each layer has a thickness of 0.05 to 0.5 μm, each first layer is made of a polyester composition, each second layer is made of a polyester composition having a composition different from the composition of the resin constituting the first layer, the maximum reflectance of light within the wavelength range of 350 to 2,000 nm is higher than the base line reflectance obtained by the light reflection curve within the wavelength range of 350 to 2,000 nm by 20% or more, and the ratio of an ethylene terephthalate component in the film is 80% or more based on the total repeating units of the polyester, wherein the crystallization peak measured by differential scanning calorimetry is within the range of 100 to 190° C., wherein the polyester constituting the first layer is a crystalline polyester and at least 90 mol % of the total repeating units is ethylene terephthalate component, wherein the polyester constituting the second layer is a crystalline polyester and 75 to 97 mol % of the total repeating units is ethylene terephthalate component, wherein the breaking strengths of the film in both film-forming direction and lateral direction are 50 MPa or more.