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DE-112024003094-T5 - Laminated glass, laminated glass for a vehicle and laminated glass for a vehicle roof

DE112024003094T5DE 112024003094 T5DE112024003094 T5DE 112024003094T5DE-112024003094-T5

Abstract

Laminated glass is provided which, even when light is blocked, can reduce the reflection of the interior of a passenger compartment or the like. A laminated glass (10) comprises a first glass plate (11), a first intermediate film (12), a PDLC-type light-setting or control film (13), a second intermediate film (14), and a second glass plate (15) in that order, wherein the laminated glass (10) has a total light transmittance of 10% or less and a haze value of 50% or more when the PDLC-type light-setting or control film (13) is switched off, the second glass plate (15) comprises a low-emissivity film (16) on a surface thereof opposite one side of the second intermediate film (14), and the visible light reflectance of a surface of the low-emissivity film (16) opposite one side of the second glass plate (15) is 0.2% or more and 3.8% or less.

Inventors

  • Hideyuki Hirakoso
  • Hisao Inokuma
  • Yasushi Kawamoto
  • Yukihiro Sumi

Assignees

  • AGC Inc.

Dates

Publication Date
20260513
Application Date
20240903
Priority Date
20230907

Claims (16)

  1. Laminated glass comprising a first glass plate, a first interlayer, a PDLC-type light-adjusting or -controlling film, a second interlayer, and a second glass plate in that order, wherein: the laminated glass has a total light transmittance of 10% or less and a haze value of 50% or more when the PDLC-type light-adjusting or -controlling film is switched off; the second glass plate comprises a low-emissivity film on one surface thereof opposite a side of the second interlayer; and the visible light reflectance of one surface of the low-emissivity film opposite a side of the second glass plate is 0.2% or more and 3.8% or less.
  2. Laminated glass after Claim 1 , wherein the low emissivity film comprises a transparent conductive layer and a reflection-adjusting layer in that order from the side of the second glass plate, and the ratio of the thickness of the reflection-adjusting layer to the thickness of the transparent conductive layer is 0.47 or more and 0.70 or less.
  3. Laminated glass comprising a first glass plate, a first interlayer, a PDLC-type light-adjusting or light-controlling film, a second interlayer, and a second glass plate in that order, wherein: the laminated glass has a total light transmittance of 10% or less and a haze value of 50% or more when the PDLC-type light-adjusting or light-controlling film is switched off; the second glass plate comprises a low-emissivity film on one surface therein opposite a side of the second interlayer; the low-emissivity film comprises a transparent conductive layer and a reflective-adjusting layer in that order on the side of the second glass plate; and the ratio of the reflective-adjusting layer thickness to the transparent conductive layer thickness is 0.47 or more and 0.70 or less.
  4. Laminated glass according to Claim 3 , wherein the reflectance of visible light from a surface of the low emissivity film to the side of the second glass plate is 0.2% or more and 3.8% or less.
  5. Laminated glass according to one of the Claims 2 until 4 , where the film thickness of the transparent conductive layer is 80 nm or more and 160 nm or less.
  6. Laminated glass according to one of the Claims 2 until 4 , where the film thickness of the reflection adjustment layer is 50 nm or more and 100 nm or less.
  7. Laminated glass according to one of the Claims 2 until 4 , wherein the transparent conductive layer is an ITO layer, a tin oxide layer, a fluorine-doped tin oxide layer, an antimony-doped tin oxide layer, a silver layer, a zirconium nitride layer or a titanium nitride layer.
  8. Laminated glass according to one of the Claims 2 until 4 , wherein the reflection-adjusting layer comprises an oxide or an oxynitride of at least one metal selected from a group consisting of Ti, Nb, Ta, Zn, Al, In, Si and Zr.
  9. Laminated glass according to one of the Claims 2 until 4 , wherein the low emissivity film further comprises a tint correction layer, the tint correction layer comprising a plurality of layers comprising a first layer and a second layer in that order from the side of the second glass plate, and a refractive index of the first layer for light with a wavelength of 630 nm is higher than a refractive index of the second layer for light with a wavelength of 630 nm.
  10. Laminated glass after Claim 9 , wherein the refractive index of the first layer for light with a wavelength of 630 nm is 1.7 or more and 2.5 or less, and the refractive index of the second layer for light with a wavelength of 630 nm is 1.6 or less.
  11. Laminated glass according to one of the Claims 2 until 4 , wherein the low emissivity film further comprises a tint correction layer and the tint correction layer comprises an oxide or an oxynitride of at least one metal selected from the group consisting of Ti, Nb, Ta, Zn, Al, In, Si and Zr.
  12. Laminated glass according to one of the Claims 2 until 4 , wherein the low emissivity film comprises a tint correction layer between a surface of the second glass plate on one side of the low emissivity film and the transparent conductive layer, and the tint correction layer has a film thickness of 20 nm or more and 60 nm or less.
  13. Laminated glass according to one of the Claims 1 until 4 , wherein the emissivity of the surface of the low-emissivity film is 0.3 or less compared to the side of the second glass plate.
  14. Laminated glass according to one of the Claims 2 until 4 , wherein the low-emissivity film comprises an adhesion-enhancing layer positioned between the transparent conductive layer and the reflection-adjusting layer.
  15. Laminated glass for a vehicle, wherein the laminated glass is laminated according to one of the Claims 1 until 4 includes.
  16. Laminated glass for a vehicle roof, wherein the laminated glass is laminated according to one of the Claims 1 until 4 includes.

Description

Technical field The present invention relates to a laminated glass or laminated glass, a laminated glass for a vehicle and a laminated glass for a vehicle roof. State of the art It is known that when a low-emissivity film is applied to a window pane of a vehicle, building, ship, or watercraft, etc., heat transfer through the window pane is reduced. Reducing heat transfer through the window pane can improve the comfort of passengers and occupants inside the vehicle, building, ship, or watercraft, etc. Laminated glass incorporating a low-emissivity film on its interior surface reduces the re-emission of heat from outside the passenger compartment, such as sunlight, and reduces the outward emission of heat generated by people inside the passenger compartment, etc., thereby reducing heat transfer between the exterior and interior of the passenger compartment through the pane or glass. Patent document 1 discloses a technique for forming a low-emissivity film on the interior surface of a substrate. Document list Patent documents Patent Document 1: Published Japanese translation of the international PCT patent application publication no. 2015-512854 Summary of the invention Technical problem In recent years, a technique has been developed for using laminated glass with a light-adjusting or light-controlling function as a window pane in a building or vehicle. Laminated glass with such a light-adjusting or light-controlling function can be created by applying a light-adjusting or light-controlling film to the laminated glass. For example, a PDLC-type light-adjusting or light-controlling film can be used for the laminated glass. By forming a low-emissivity film on the interior surface of the glass in the aforementioned laminated glass, comfort within a passenger compartment can be improved and privacy can be ensured. However, with laminated glass that has a low-emissivity film applied to it, the amount of light from outside the passenger compartment decreases when light from outside the passenger compartment is blocked by a light-adjusting or -control film. Therefore, a problem arises in that the reflection from the interior of the passenger compartment or similar surfaces on the laminated glass becomes considerable. Furthermore, if a PDLC-type light-adjusting or light-controlling film is used for the laminated glass, the laminated glass may exhibit a grainy appearance when viewed from the interior side due to the operating principle of the PDLC-type light-adjusting or light-controlling film. If this grainy appearance becomes pronounced, it can cause a specific discomfort (haze discomfort). With regard to the problem described above, it is an object of the present invention to provide a laminated glass, a laminated glass for a vehicle and a laminated glass for a vehicle roof which, even when light is shielded, can reduce the reflection of the interior of a passenger compartment or the like and reduce haze discomfort. Solution to the problem A glass panel for a vehicle, a laminated glass for a vehicle, and a laminated glass for a vehicle roof according to one aspect of the present disclosure have the following configurations. [1] Laminated glass comprising a first glass plate, a first interlayer, a PDLC-type light-adjusting or light-controlling film, a second interlayer and a second glass plate in that order, wherein the laminated glass has a total light transmittance of 10% or less and a haze value of 50% or more when the PDLC-type light-adjusting or -controlling film is switched off, the second glass plate comprises a low-emissivity film on one surface of it opposite one side of the second intermediate film and a reflectance of visible light from a surface of the film with low emissivity to one side of the second glass plate is 0.2% or more and 3.8% or less. [2] Laminated glass according to [1], wherein The low-emissivity film comprises a transparent conductive layer and a reflective adjusting layer in that order from the side of the second glass plate and a ratio of the film thickness of the reflection-adjusting layer to the film thickness of the transparent conductive layer is 0.47 or more and 0.70 or less. [3] Laminated glass comprising a first glass plate, a first interlayer, a PDLC-type light-adjusting or light-controlling film, a second interlayer and a second glass plate in that order, wherein the laminated glass has a total light transmittance of 10% or less and a haze value of 50% or more when the PDLC-type light-adjusting or -controlling film is switched off, the second glass plate comprises a low-emissivity film on one surface of it opposite one side of the second intermediate film, The low-emissivity film comprises a transparent conductive layer and a reflective adjusting layer in that order from the side of the second glass plate and a ratio of the film thickness of the reflection-adjusting layer to the film thickness of the transparent conductive layer is 0.47 or more and 0.70 or less. [4] Laminated gl