Biaxially stretched laminated polyester film, infrared light shielding structure for laminated glass composed of the same, and laminated glass composed of the same
First Claim
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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Accused Products
Abstract
Provided are a biaxially stretched laminated polyester film 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.
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Citations
19 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- 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;
Specification