JP2007148330A - Near infrared ray reflective substrate and near infrared ray reflective laminated glass using the same - Google Patents

Near infrared ray reflective substrate and near infrared ray reflective laminated glass using the same Download PDF

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JP2007148330A
JP2007148330A JP2006112251A JP2006112251A JP2007148330A JP 2007148330 A JP2007148330 A JP 2007148330A JP 2006112251 A JP2006112251 A JP 2006112251A JP 2006112251 A JP2006112251 A JP 2006112251A JP 2007148330 A JP2007148330 A JP 2007148330A
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near
film
infrared reflective
lt
gt
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JP2006112251A
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Japanese (ja)
Inventor
Isao Nakamura
Hideo Omoto
Atsushi Takamatsu
Masaaki Yonekura
功 中村
英雄 大本
正明 米倉
敦 高松
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Central Glass Co Ltd
セントラル硝子株式会社
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Application filed by Central Glass Co Ltd, セントラル硝子株式会社 filed Critical Central Glass Co Ltd
Priority to JP2006112251A priority patent/JP2007148330A/en
Priority claimed from EP06821880A external-priority patent/EP1942356A4/en
Publication of JP2007148330A publication Critical patent/JP2007148330A/en
Application status is Pending legal-status Critical

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10009Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheet
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10165Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin particular functional features of the laminated glazing
    • B32B17/10174Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
    • B32B17/10201Dielectric coatings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/1055Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the resin layer, i.e. interlayer
    • B32B17/10614Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the resin layer, i.e. interlayer comprising particulate matter for purposes other than dyeing
    • B32B17/10633Infrared radiation absorbing or reflecting agents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/1055Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the resin layer, i.e. interlayer
    • B32B17/10761Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the resin layer, i.e. interlayer containing vinyl acetal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/1055Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the resin layer, i.e. interlayer
    • B32B17/10788Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the resin layer, i.e. interlayer containing ethylene vinylacetate

Abstract

<P>PROBLEM TO BE SOLVED: To provide a near infrared ray reflective substrate which exhibits high visible light transmissivity regulated by JIS R3106-1998 and high reflectivity in a near infrared ray region, has good heat insulation effect and can transmits various kinds of electric waves. <P>SOLUTION: A near infrared ray reflective substrate comprises a near infrared ray reflective film formed on a transparent polymer resin sheet by alternately laminating a dielectric film of low refractive index and a dielectric film of high refractive index. In the near infrared ray reflective substrate, the polymer resin sheet, where the near infrared ray reflective film is formed, exhibits visible light transmissivity of 70% or above regulated by JIS R3106-1998 and has a maximal value of reflection exceeding 50% in a wavelength region of 900 to 1,400 nm. TiO<SB>2</SB>or Nb<SB>2</SB>O<SB>5</SB>or Ta<SB>2</SB>O<SB>5</SB>is used as the dielectric film of high refractive index and SiO<SB>2</SB>is used as the dielectric film of low refractive index. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention reduces the temperature rise caused by the heat radiation of sunlight directly shining on the display in order to reduce the temperature rise on the transmission side (transmission side) of the windows of vehicles and buildings caused by the heat radiation of sunlight. The present invention relates to a heat ray reflective substrate used for the purpose, and laminated glass using the thermal warfare reflective substrate.

  The thermal radiation energy of sunlight flowing into the room through the window glass is lowered to suppress the temperature rise in the room, the consumption of electrical energy consumed by operating the cooling device is reduced, and the window glass has high visible light. Many attempts have been made to create a comfortable indoor space by maintaining a high transmittance.

  In Patent Document 1, in laminated glass having an intermediate film between at least two transparent glass plates, conductive ultrafine particles having a particle size of 0.2 μm or less are dispersed in the intermediate film, whereby visible light is obtained. It has been devised to reduce the solar transmittance to about 50% while keeping the transmittance of the area high.

  However, since the laminated glass disclosed in Patent Document 1 absorbs light in the near infrared region, the laminated glass itself warms up to a high temperature, and is referred to as re-radiation with respect to the radiation of sunlight. Since radiant heat is emitted toward the room, the room temperature rises after a long period of time.

  Moreover, in patent document 2, the interference film reflective film which laminated | stacked the metal film whose solar radiation reflectance is 10% or more, or resin was formed in the polyester film, and this was pinched | interposed with the polyvinyl butyral film | membrane, and the laminated glass was produced. Are disclosed. This laminated glass has a drawback that the thickness and weight increase compared to the current laminated glass.

  Further, in Patent Document 3, a heat ray reflective laminated windshield in which a total of five layers of an Ag film and a metal oxide film are laminated, and in Patent Document 4, a heat ray reflective glass in which four layers of an ITO film, an AlN film, and a metal film are laminated. It is disclosed.

  However, in the reflection by the interference film of Patent Document 2, the reflectance in the near infrared region is small and sufficient heat insulation cannot be obtained.

Moreover, in the reflective film which consists of a metal film of patent document 2, and the heat ray reflective laminated glass currently disclosed by patent document 3 and patent document 4, electrically conductive films, such as a conductive metal film and a conductive oxide film, are used. It has been. When conductive films are used, radio waves in a wide range of frequency bands such as TV, radio, ETC, wireless LAN, mobile phones, etc. are not transmitted, and communication systems using various radio waves are being constructed. It becomes difficult to use it for the windows of buildings and vehicles.
JP-A-8-259279 JP 2003-342046 A JP 2002-348151 A Japanese Patent Laid-Open No. 2-160641

  The present invention has been made in order to solve the problems of the near-infrared reflective laminated glass according to the prior art, and has high visible light transmittance as defined in JIS R3106-1998 and reflection in the near-infrared region. Provided are a near-infrared reflective substrate and a near-infrared reflective laminated glass that have a high rate and a good heat insulation effect and transmit various radio waves.

  The near-infrared reflective substrate of the present invention includes a near-infrared reflective film in which a low-refractive index dielectric film and a high-refractive index dielectric film are alternately laminated on a transparent polymer resin sheet. In the reflective substrate, the near-infrared reflective film is laminated with at least 4 layers and at most 11 layers of dielectric films on at least one surface of the polymer resin sheet so as to satisfy the following conditions (1) and (2): The visible light transmittance defined in JIS R3106-1998 of the polymer resin sheet on which the near-infrared reflective film is formed is 70% or more, and exceeds 50% in the wavelength region from 900 nm to 1400 nm. A near-infrared reflective substrate having a maximum value of reflection.

(1) a dielectric film counted in order from the polymer resin sheet surface, the maximum value of the refractive index of the even-numbered layer n emax, the minimum value and n emin, the maximum value of the refractive index of the odd-numbered layer n omax, minimum when the value was n omin, n emax <n omin or n omax <n emin.

(2) When the refractive index of the i-th layer is n i and the thickness is d i , 225 nm ≦ n i · d i ≦ 350 nm for infrared rays having a wavelength λ of 900 to 1400 nm.

The near-infrared reflective substrate of the present invention is the above-mentioned near-infrared reflective substrate, wherein TiO 2, Nb 2 O 5 or Ta 2 O 5 is used as the high refractive index dielectric film, and SiO 2 is used as the low refractive index dielectric film. A near-infrared reflective substrate, wherein a near-infrared reflective film is formed.

  The near-infrared reflective substrate of the present invention is a near-infrared reflective substrate, wherein the polymer resin sheet is an infrared-absorbing film in the near-infrared reflective substrate.

    Further, the near-infrared reflective laminated glass of the present invention is a near-infrared reflective laminated glass characterized in that the near-infrared reflective substrate is laminated between two sheet glasses using an intermediate film. is there.

Also, near infrared reflection laminated glass of the present invention, in the near-infrared reflecting laminated glass, in the range thickness of the polymer resin sheet is 10 to 100 [mu] m, characterized by the use of a plate glass having a curved surface near infrared Reflective laminated glass.

  Moreover, the near-infrared reflective laminated glass of the present invention is the near-infrared reflective laminated glass, wherein the intermediate film contains an infrared absorber.

  Moreover, the near-infrared reflective laminated glass of the present invention is the near-infrared reflective laminated glass, wherein the infrared absorbing material is conductive oxide particles.

  Moreover, the near-infrared reflective laminated glass of the present invention is a near-infrared reflective laminated glass in the near-infrared reflective laminated glass, wherein the plate glass is an infrared-absorbing glass.

  The near-infrared reflective substrate of the present invention and the near-infrared reflective laminated glass using the same provide a laminated glass that has a high transmittance in the visible light region, has a good heat insulating effect, and transmits various radio waves.

  As shown in FIG. 1, the near-infrared reflective substrate of the present invention is formed by forming a near-infrared reflective film 1a composed of a multilayer film in which a transparent dielectric is laminated on a polymer resin sheet 1b. JIS R3106-1998 And has a maximum value of reflection exceeding 50% in a wavelength region of wavelengths from 900 nm to 1400 nm.

  As the polymer resin sheet 1b, a polymer sheet such as polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polymethyl methacrylate, polyether sulfone, nylon, polyarylate, and cycloolefin polymer is used.

  On the surface of the polymer resin sheet 1b, a silane compound, a water-dispersible polyester-based material, an imine-based material, etc. are used for the purpose of improving the adhesion to the dielectric film constituting the near-infrared reflective film and the smoothness of the surface. The surface modification material may be applied.

In the surface modifying material, fine particles of inorganic oxides such as SiO 2 , SiON, Al 2 O 3 and inorganic oxynitrides are mixed within a range that does not impair the transmission characteristics and does not greatly change the refractive index. May be.

  In addition, it is preferable to use an infrared absorbing film such as polyethylene terephthalate or polycarbonate containing an infrared absorbing pigment in the polymer resin sheet 1b, or polyethylene terephthalate or polycarbonate coated with an infrared absorbing paint, because heat insulation performance is improved. .

For the dielectric film, a transparent dielectric such as TiO 2 , Nb 2 O 5 , Ta 2 O 5 , SiO 2 , Al 2 O 3 , ZrO 2 , MgF 2 can be preferably used.

  A multilayer film made of a transparent dielectric is used as the near-infrared reflective film 1a. When a dielectric having strong absorption in the visible range is used, the near-infrared reflective film 2 has low transmission in the visible range, and visibility can be secured. This is because it becomes difficult to use as an opening of a window.

  In addition, when a conductive film such as various thin metal films or conductive oxide films is used for the infrared reflection film, it reflects light and radio waves having a longer wavelength than near infrared rays, so that the cellular phone, wireless LAN, television, In addition to reflecting radio waves used for various types of communication such as radio, these communication functions are paralyzed, and when used as a window of an automobile, communication functions using radio waves cannot be used. Since it is difficult to send and receive various radio waves related to safe operation such as ETC, GPC, orbis, it is desirable to use a laminated film made of a dielectric instead of a conductive film as a near-infrared reflecting film.

  For the lamination of the dielectric films, it is desirable to use a sputtering method capable of forming a film with a uniform thickness over a large area.

  However, the film formation method is not limited to the sputtering method, and an evaporation method, an ion plating method, a CVD method, a sol-gel method, or the like can be used depending on the size of the substrate.

The near-infrared reflective film 1a reflects near-infrared light by interference of the laminated dielectric films. The dielectric films constituting the near-infrared reflective film 1a are counted in order from the glass surface, and the refractive index of the even-numbered film is determined. the maximum value n emax and the minimum value and n emin, odd film maximum value n omax refractive index of the minimum value as n Omin, it is desirable that the n emax <n omin or n omax <n emin.

Furthermore, the refractive index n i and the thickness of the i-th dielectric film are d i , and the optical path difference n i · d i is ¼ of the wavelength for infrared rays having a wavelength in the range of 900 nm to 1400 nm. Therefore, it is desirable that the optical path difference n i · d i is 900 nm / 4 = 225 nm or more and 1400 nm / 4 = 350 nm or less for a wavelength range of 900 nm to 1400 nm.

  By forming the refractive index n and thickness d of the dielectric film so as to satisfy the above-described conditions, the near-infrared reflective film formed of a dielectric multilayer film effectively reflects light in the wavelength region of 900 nm to 1400 nm. It becomes possible.

  When the number of laminated dielectric films constituting the near-infrared reflective film 1a is 3 or less, reflection in the near-infrared region is insufficient, and it is desirable that the number is 4 or more.

  Moreover, the maximum value of reflection in the near infrared region increases as the number of layers increases, and the color in the visible light region becomes nearly colorless, so that a better near infrared reflection substrate is obtained, but when the number of layers exceeds 12 layers Since the manufacturing cost becomes high and the problem of durability arises due to the increase in the film stress due to the increase in the number of films, the number of layers is preferably 11 or less.

  The thickness of the polymer resin sheet 1b used for the near-infrared reflective substrate 1 of the present invention is preferably in the range of 1 to 6 mm in view of strength and light transmittance in the visible light range. The thickness of the polymer resin sheet 1b to be used is not limited.

  Since the near-infrared reflective substrate 1 of the present invention can reduce temperature rise due to thermal radiation of various display devices used in a place where sunlight is directly irradiated, it is suitable for the front surface of a display device for the purpose of improving the life of the device. Can be used for

  Further, as shown in FIG. 2, the near-infrared reflective substrate of the present invention is laminated with plate glasses 3 and 6 so that the near-infrared reflective film is in contact with the intermediate film 4a and / or the intermediate film 4b to reflect the near-infrared light. When used as the laminated glass 2, it can be used for a wide range of applications regardless of the durability of the near-infrared reflective film.

  When the near-infrared reflective substrate is made into a near-infrared reflective laminated glass using an intermediate film, the polymer resin sheet 1b is exposed to a temperature exceeding 100 ° C., and therefore, shrinkage and extension occur depending on the temperature at which the processing is performed. A small amount of polymer resin sheet is more preferably used.

  For the intermediate films 4a and 4b, ethylene vinyl acetate (EVA) or polyvinyl butyral (PVB) is preferably used.

  In the near-infrared reflective laminated glass 2 shown in FIG. 2, when the plate glass 3 is disposed on the incident side of infrared rays such as sunlight, the glass used for the plate glass 3 absorbs as much as possible near-infrared rays in the wavelength range of 900 nm to 1400 nm. It is desirable to use a glass having a small amount. The reason is that when the plate glass 3 absorbs near-infrared light reflected by the near-infrared reflective substrate 1, before it is reflected by the near-infrared reflective substrate 1, it absorbs heat rays emitted from the sun, and the near-infrared reflective laminated glass. This is because the temperature of 2 rises and heat is re-radiated from the near-infrared laminated glass 2 to the transmission side, so that the heat-shielding effect of the near-infrared reflective substrate 1 is reduced.

  The intermediate films 4a and 4b may be used as a single layer, or different types of intermediate films may be used in multiple layers.

  Further, when the plate glass 3 is used on the incident side of sunlight or the like, it is preferable that the intermediate film 4b contains fine particles that absorb various infrared rays within a range that does not impair the visible light transmittance, since heat insulation is improved. Examples of fine particles that absorb infrared rays include fine metal particles such as Ag, Al, and Ti, fine particles of metal nitride and metal oxide, and conductive transparent oxide fine particles such as ITO, ATO, AZO, GZO, and IZO. One or more of these can be selected and included in the intermediate film 5 to improve the heat insulation performance. In particular, conductive transparent oxide fine particles such as ITO, ATO, AZO, GZO, and IZO are desirable.

  As the plate glass 6, like the plate glass 3 on the incident side, it is easy to use soda lime glass by the float method, which has good smoothness, little distortion of the fluoroscopic image, has rigidity, is obtained at low cost.

  Further, it is preferable to use infrared absorbing glass for the plate glass 6 because the heat insulation performance is improved. As the infrared ray absorbing glass, glass that melts metal ions such as Fe in glass and absorbs near infrared rays can be used, and heat ray absorbing plate glass defined in JIS R3208-1998 can also be used.

  The thickness of the plate glass 3 and the plate glass 6 used for the near-infrared reflective laminated glass of the present invention is preferably in the range of 1 to 6 mm in view of strength and transparency of near red light in the visible light region. The thickness of the glass used in the invention is not limited. Further, the thickness of the plate glass 3 and the thickness of the plate glass 6 may be the same or different.

  The thickness of the intermediate films 4a and 4b is preferably about 0.5 mm to 2 mm, but is not particularly limited to this thickness.

  In addition, it is not preferable to use conductive glass or polymer resin film because it impairs the radio wave transmittance of the near infrared reflective laminated glass of the present invention. A composite film, such as a product in which fine particles of a product are dispersed in a polymer resin film, can be suitably used as long as it is not conductive enough to reflect radio waves.

  The visible light transmittance of the near-infrared reflective laminated glass of the present invention is desirably 70% or more as the transmittance that can ensure sufficient visibility. When used for the front glass of an automobile, it is defined by JIS R3211. It is important that the visible light transmittance is 70%.

  In order to exhibit effective thermal insulation against sunlight thermal radiation while maintaining the transmittance in the visible light region, it is important that the reflectance in the wavelength region from 900 nm to 1400 nm has a maximum value exceeding 50%. It is. This is shown in JIS R3106-1998 in consideration of the energy distribution of the wavelength of sunlight and the wavelength that becomes heat due to absorption, while minimizing the absorption and reflection in the visible light region that cause a decrease in the visible light transmittance. In order to effectively reduce the solar radiation transmittance, it is necessary to reflect light in the wavelength region from 900 nm to 1400 nm having a relatively large weight coefficient for calculating the solar radiation transmittance described in JIS R3106-1998. Therefore, it is effective to have a maximum of reflection in the wavelength region from 900 nm to 1400 nm. Furthermore, in order to exhibit effective heat insulation performance, it is important that the maximum value of reflection is 50% or more.

  Since the near-infrared reflective laminated glass 2 of the present invention has high visible light transmittance and radio wave transparency, it can be suitably used for windows of vehicles such as automobiles and trains and windows of buildings.

  As shown in FIG. 3, a good adhesive layer (not shown) with glass is formed on the surface of the near infrared reflecting substrate 1 where the near infrared reflecting film is not formed or on the near infrared reflecting film. After the incident side plate glass 8 and the near-infrared reflective substrate 1 are laminated through the adhesive layer, the transmission side plate glass 11 is laminated through the polymer resin film 10 to process the near-infrared reflective laminated glass 7. It is good.

  A near-infrared reflective laminated glass shown in FIG. 1 was produced. As the polymer resin sheet 1b, a polyethylene terephthalate film having a size of 1000 mm × 1000 mm and a thickness of 100 μm was used.

This film was washed and dried, set in a sputter deposition apparatus, and five dielectric films were laminated on the surface to form a near-infrared reflective film 1a. As a dielectric film constituting the near-infrared reflective film 1a, from the polymer resin sheet 1b, a TiO 2 film (thickness 105 nm), a SiO 2 film (thickness 175 nm), a TiO 2 film (thickness 105 nm), a SiO 2 film. (Thickness: 175 nm) and a TiO 2 film (thickness: 105 nm) were sequentially formed.

  The near-infrared reflective substrate has a visible light transmittance of 82% as defined in JIS R3106-1998. When the reflection characteristics of the plate glass surface are examined, it has a maximum value of reflection at a wavelength of 1000 nm, and the maximum value is 82%. It had sufficient near-infrared reflection characteristics to exhibit effective heat insulation performance. Moreover, when the electrical resistance of the near-infrared reflective film 1a was measured, it was almost infinite.

  The near-infrared reflective substrate 2 shown in FIG. 2 was produced using the near-infrared reflective substrate of Example 1.

  As the incident side plate glass 3 and the transmission side plate glass 6, soda lime glass produced by a transparent float method having a size of 1000 mm × 1000 mm and a thickness of 2 mm was used.

  Polymer resin films 4a and 4b made of PVB film having a thickness of 0.38 mm are prepared, and incident side plate glass 3, polymer resin film 4a, near-infrared reflective substrate 1, polymer resin film 4b, and transmission side plate glass 6 are sequentially formed. Overlap and autoclave treatment were performed for the combined treatment. Here, the near-infrared reflecting film (not shown) of the near-infrared reflecting substrate 13 was positioned on the polymer resin film 4a side.

  The near-infrared reflective laminated glass 2 produced in this example has a visible light transmittance of 82%. When the reflection characteristics of the incident side surface are examined, it has a maximum value of reflection at a wavelength of 1000 nm, and the maximum value is 61%. It had sufficient near-infrared reflection characteristics to exhibit excellent heat insulation performance.

  Further, when the transmission of various radio waves was examined, it showed a sufficient transmission characteristic, and there was no problem in practical use.

    A near-infrared reflective substrate 1 shown in FIG. 1 was produced in the same manner as in Example 1 except that the near-infrared reflective film 1a was a seven-layer dielectric film and a polyethylene terephthalate film having a thickness of 100 μm was used.

As the near-infrared reflective film 1a, an Nb 2 O 5 film (thickness 115 nm), an SiO 2 film (thickness 175 nm), an Nb 2 O 5 film (thickness 115 nm), and an SiO 2 film are formed on the surface of the polymer resin sheet 1b. (Thickness: 175 nm), Nb 2 O 5 film (thickness: 115 nm), SiO 2 film (thickness: 175 nm), Nb 2 O 5 film (thickness: 115 nm) are stacked in this order to form a seven-layer dielectric film did.

  The near-infrared reflective substrate has a visible light transmittance of 79% as defined in JIS R3106-1998. When the reflection characteristics of the plate glass surface are examined, it has a maximum value of reflection at a wavelength of 1050 nm, and the maximum value is 89%. It had sufficient near-infrared reflection characteristics to exhibit effective heat insulation performance.

  A near-infrared reflective substrate 2 shown in FIG. 2 was produced using the near-infrared reflective substrate of Example 3.

  As the incident side plate glass 3 and the transmission side plate glass 6, soda lime glass produced by a transparent float method having a size of 1000 mm × 1000 mm and a thickness of 2 mm was used.

  Polymer resin films 4a and 4b made of PVB film having a thickness of 0.38 mm are prepared, and incident side plate glass 3, polymer resin film 4a, near-infrared reflective substrate 1, polymer resin film 4b, and transmission side plate glass 6 are sequentially formed. Overlap and autoclave treatment were performed for the combined treatment. Here, the near-infrared reflecting film (not shown) of the near-infrared reflecting substrate 13 was positioned on the polymer resin film 4a side. As the transmission side plate glass 6, green heat ray absorbing glass having a thickness of 2 mm was used.

  The near-infrared reflective laminated glass 2 produced in this example has a visible light transmittance of 77%. When the reflection characteristics of the incident side surface are examined, it has a maximum value of reflection at a wavelength of 1050 nm, and the maximum value is 74%, which is effective. It had sufficient near-infrared reflection characteristics to exhibit excellent heat insulation performance.

  Further, when the transmission of various radio waves was examined, it showed a sufficient transmission characteristic, and there was no problem in practical use.

A Nb 2 O 5 film (thickness 115 nm), a SiO 2 film (thickness 175 nm), a TiO 2 film (thickness 110 nm), SiO 2 as a near-infrared reflective film on the surface of a polyethylene terephthalate film similar to that in Example 1. Seven layers of two films (thickness 175 nm), TiO 2 film (thickness 110 nm), SiO 2 film (thickness 175 nm), and Nb 2 O 5 film (thickness 115 nm) are stacked in this order, and are shown in FIG. A near-infrared reflective substrate 1 was produced.

  When the electric resistance of the near-infrared reflective film 1a was measured, it was almost infinite.

  The near-infrared reflective substrate has a visible light transmittance of 80% as defined in JIS R3106-1998. When the reflection characteristics of the plate glass surface are examined, it has a maximum value of reflection at a wavelength of 1050 nm, and the maximum value is 91%. It had sufficient near-infrared reflection characteristics to exhibit effective heat insulation performance.

  A near-infrared reflective laminated glass 2 shown in FIG. 2 was produced using the near-infrared reflective substrate 1 of Example 5.

  The same glass as in Example 1 is prepared as the transmission side plate glass 6 and the incident side plate glass 3, and the formation surface of the dielectric multilayer film 3a of the polymer resin sheet 3b, which is a polyethylene terephthalate film, is set as the incident side. Were combined with two PVB films having a thickness of 0.38 mm to obtain a near-infrared reflective laminated glass 2.

  The near-infrared reflective laminated glass 1 had a visible light transmittance of 81%. When the reflection characteristics of the incident side surface were examined, it had a maximum reflection value of 67% at a wavelength of 1050 nm and had a sufficient near-infrared reflection function. .

  Further, when the transmission of various radio waves was examined, it showed a sufficient transmission characteristic and there was no problem in practical use.

Comparative Example 1
In the same manner as in Example 1, two transparent soda lime glasses and a polyethylene terephthalate film having a thickness of 100 μm were prepared. A dielectric film of a TiO 2 film (thickness 105 nm), a SiO 2 film (thickness 175 nm), and a TiO 2 film (thickness 105 nm) is sequentially formed on this polyethylene terephthalate film by a sputtering method to form a three-layer dielectric. A multilayer film was formed. In the same manner as in Example 2, this was combined through two PVB films having a thickness of 0.38 mm. Although the visible light transmittance of this laminated glass was 81%, when the reflection characteristics of the incident side surface were examined, the maximum value of reflection was found at a wavelength of 1000 nm, but the maximum values were 45% and less than 50%. It could not be said to have a near infrared reflection function.

Comparative Example 2
In the same manner as in Example 1, two transparent soda lime glasses and a polyethylene terephthalate film were prepared. To a polyethylene terephthalate film, a TiO 2 film (thickness 70 nm), a SiO 2 film (thickness 120 nm), a TiO 2 film (thickness 70 nm), a SiO 2 film (thickness 120 nm), a TiO 2 film (thickness 70 nm), A SiO 2 film (thickness 120 nm) was sequentially formed by a sputtering method to form a five-layer dielectric multilayer film. All of these dielectric films have n i · d i = 175 nm and are less than 225 nm.

  This dielectric multilayer film was formed on the incident side, and was subjected to a bonding process through two PVB films having a thickness of 0.38 mm in the same manner as in Example 2.

  The laminated glass had a visible light transmittance as low as 54%, a reflectance at a wavelength of 1000 nm of about 10%, and a near infrared reflectance.

Comparative Example 3
As in Example 1, two transparent soda lime glasses and a polyethylene terephthalate film were prepared. A TiO 2 film (thickness 160 nm), a SiO 2 film (thickness 260 nm), and a TiO 2 film (thickness) were prepared on the polyethylene terephthalate film. 160 nm), a SiO 2 film (thickness 260 nm), and a TiO 2 film (thickness 160 nm) were sequentially formed by sputtering to form a five-layer dielectric multilayer film.

The five dielectric films all have n i · d i = 375 nm, which is a value larger than 350 nm.

  This dielectric multilayer film was formed on the incident side, and was subjected to a bonding process through two PVB films having a thickness of 0.38 mm in the same manner as in Example 1. This laminated glass had a very low visible light transmittance of 44%, a reflectance at a wavelength of 1000 nm of about 10%, and a near infrared reflectance.

Comparative Example 4
In the same manner as in Example 1, two transparent soda lime glasses and a polyethylene terephthalate film were prepared. A TiO 2 film (thickness 110 nm), a SiO 2 film (thickness 175 nm), and an Nb 2 O 5 film were formed on the polyethylene terephthalate film. (Thickness 115 nm), a TiO 2 film (thickness 110 nm), and a TiO 2 film (thickness 110 nm) were sequentially formed by sputtering to form a five-layer dielectric multilayer film.

The dielectric film of the five-layer is a multilayer film which does not satisfy the condition of n emax <n omin or n omax <n emin.
The dielectric multilayer film was formed on the incident side, and was subjected to a bonding process through two PVB films having a thickness of 0.38 mm in the same manner as in Example 1. Although the visible light transmittance of this laminated glass was 80%, the reflectance at a wavelength of 1000 nm was about 40%, and the reflectance of near infrared rays was low.

Sectional drawing which shows the structure of the near-infrared reflective board | substrate of this invention. Sectional drawing which shows the structure of the near-infrared reflective laminated glass of this invention. Sectional drawing which shows another structure of the near-infrared reflective laminated glass of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Near-infrared reflective board | substrate 1a Near-infrared reflective film 1b Polymer resin sheet 2 Near-infrared reflective laminated glass 3 Incident side plate glass 4a, 4b Intermediate film 6 Transmission side plate glass 7 Near infrared reflection laminated glass 10 Intermediate film 11 Transmission side plate glass

Claims (8)

  1. In a near-infrared reflective substrate in which a near-infrared reflective film in which a low-refractive-index dielectric film and a high-refractive-index dielectric film are alternately laminated is formed on a transparent polymer resin sheet, the near-infrared reflective film is In order to satisfy the following conditions (1) and (2), the near-infrared reflective film is formed by laminating a dielectric film with at least 4 layers and at most 11 layers on at least one surface of the polymer resin sheet. The visible light transmittance defined in JIS R3106-1998 of the polymer resin sheet formed with the above is 70% or more, and has a maximum value of reflection exceeding 50% in the wavelength region from 900 nm to 1400 nm. A near-infrared reflective substrate.
    (1) a dielectric film counted in order from the polymer resin sheet surface, the maximum value of the refractive index of the even-numbered layer n emax, the minimum value and n emin, the maximum value of the refractive index of the odd-numbered layer n omax, minimum when the value was n omin, n emax <n omin or n omax <n emin.
    (2) When the refractive index of the i-th layer is n i and the thickness is d i , 225 nm ≦ n i · d i ≦ 350 nm with respect to infrared rays having a wavelength λ of 900 to 1400 nm.
  2. A near-infrared reflective film is formed by using TiO 2, Nb 2 O 5 or Ta 2 O 5 for a high refractive index dielectric film and SiO 2 for a low refractive index dielectric film. The near-infrared reflective substrate according to claim 1.
  3.   The near-infrared reflective substrate according to claim 1, wherein the polymer resin sheet is an infrared absorbing film.
  4.     A near-infrared reflective laminated glass, wherein the near-infrared reflective substrate according to any one of claims 1 to 3 is laminated between two sheet glasses using an intermediate film.
  5.   The near-infrared reflective laminated glass according to claim 4, wherein the thickness of the polymer resin sheet is in the range of 10 to 100 µm, and a curved plate glass is used.
  6.   The near-infrared reflective laminated glass according to claim 4, wherein the intermediate film contains an infrared absorbing material.
  7.   The near-infrared reflective laminated glass according to any one of claims 4 to 6, wherein the infrared absorbing material is conductive oxide particles.
  8. The near-infrared reflective laminated glass according to any one of claims 4 to 7, wherein the plate glass is an infrared-absorbing glass.
JP2006112251A 2005-11-04 2006-04-14 Near infrared ray reflective substrate and near infrared ray reflective laminated glass using the same Pending JP2007148330A (en)

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JP2006112251A JP2007148330A (en) 2005-11-04 2006-04-14 Near infrared ray reflective substrate and near infrared ray reflective laminated glass using the same
EP06821880A EP1942356A4 (en) 2005-10-26 2006-10-16 Near infrared ray reflective substrate and near infrared ray reflective laminated glass employing that substrate, near infrared ray reflective double layer glass
PCT/JP2006/320575 WO2007049478A1 (en) 2005-10-26 2006-10-16 Near infrared ray reflective substrate and near infrared ray reflective laminated glass employing that substrate, near infrared ray reflective double layer glass
US12/066,738 US20090237782A1 (en) 2005-10-26 2006-10-16 Near Infrared Ray Reflective Substrate And Near Infrared Ray Reflective Laminated Glass Employing That Substrate, Near Infrared Ray Reflective Double Layer Glass
TW95139026A TWI321552B (en) 2005-10-26 2006-10-23

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