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Biaxially stretched laminated polyester film, infrared light shielding structure for laminated glass composed of the same, and laminated glass composed of the same

  • US 10,241,248 B2
  • Filed: 11/28/2012
  • Issued: 03/26/2019
  • Est. Priority Date: 11/29/2011
  • Status: Active Grant
First Claim
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1. A biaxially stretched laminated polyester film comprising 51 layers or more in total, in which a first layer and a second layer are alternately laminated, which is characterized in that 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,wherein the biaxially stretched laminated polyester film has a single-layered protective layer composed of a polymer having a glass transition temperature of 90°

    C. or higher and having a thickness of 5 μ

    m or more and not more than 20 μ

    m on both sides of a laminated structure portion (I) in which the first layer and the second layer are alternately laminated,wherein the single-layered protective layer and the laminated structure portion (I) are directly attached,wherein the polymer of the protective layer includes polyethylene naphthalate, polystyrene, polyphenylene sulfide, polyether sulfone, or polyphenylene oxide.

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