WO2014156822A1 - 合わせガラス - Google Patents
合わせガラス Download PDFInfo
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- WO2014156822A1 WO2014156822A1 PCT/JP2014/057303 JP2014057303W WO2014156822A1 WO 2014156822 A1 WO2014156822 A1 WO 2014156822A1 JP 2014057303 W JP2014057303 W JP 2014057303W WO 2014156822 A1 WO2014156822 A1 WO 2014156822A1
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- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
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- 239000000600 sorbitol Substances 0.000 description 1
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- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 125000001302 tertiary amino group Chemical group 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000009283 thermal hydrolysis Methods 0.000 description 1
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- 239000002562 thickening agent Substances 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 150000003608 titanium Chemical class 0.000 description 1
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- 229910000348 titanium sulfate Inorganic materials 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- RIUWBIIVUYSTCN-UHFFFAOYSA-N trilithium borate Chemical compound [Li+].[Li+].[Li+].[O-]B([O-])[O-] RIUWBIIVUYSTCN-UHFFFAOYSA-N 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- IIBYPFWXQQDGFC-UHFFFAOYSA-N trimethyl-[2-(2-methylprop-2-enoylamino)propyl]azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC(C)NC(=O)C(C)=C IIBYPFWXQQDGFC-UHFFFAOYSA-N 0.000 description 1
- LMRVIBGXKPAZLP-UHFFFAOYSA-N trimethyl-[2-methyl-2-(prop-2-enoylamino)propyl]azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC(C)(C)NC(=O)C=C LMRVIBGXKPAZLP-UHFFFAOYSA-N 0.000 description 1
- GHVWODLSARFZKM-UHFFFAOYSA-N trimethyl-[3-methyl-3-(prop-2-enoylamino)butyl]azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CCC(C)(C)NC(=O)C=C GHVWODLSARFZKM-UHFFFAOYSA-N 0.000 description 1
- 150000004961 triphenylmethanes Chemical class 0.000 description 1
- SOLUNJPVPZJLOM-UHFFFAOYSA-N trizinc;distiborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-][Sb]([O-])([O-])=O.[O-][Sb]([O-])([O-])=O SOLUNJPVPZJLOM-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 150000003722 vitamin derivatives Chemical class 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
- NDKWCCLKSWNDBG-UHFFFAOYSA-N zinc;dioxido(dioxo)chromium Chemical compound [Zn+2].[O-][Cr]([O-])(=O)=O NDKWCCLKSWNDBG-UHFFFAOYSA-N 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- 239000002888 zwitterionic surfactant Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J3/00—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles
- B60J3/007—Sunglare reduction by coatings, interposed foils in laminar windows, or permanent screens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
- G02B5/281—Interference filters designed for the infrared light
- G02B5/282—Interference filters designed for the infrared light reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered 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
- B32B17/10—Layered 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
- B32B17/10005—Layered 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 laminated safety glass or glazing
- B32B17/10009—Layered 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 laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
- B32B17/10036—Layered 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 laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered 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
- B32B17/10—Layered 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
- B32B17/10005—Layered 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 laminated safety glass or glazing
- B32B17/10165—Functional features of the laminated safety glass or glazing
- B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
- B32B17/1044—Invariable transmission
- B32B17/10449—Wavelength selective transmission
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered 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
- B32B17/10—Layered 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
- B32B17/10005—Layered 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 laminated safety glass or glazing
- B32B17/1055—Layered 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 laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10761—Layered 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 laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
- C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
- C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
- C03C17/3681—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer the multilayer coating being used in glazing, e.g. windows or windscreens
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
- C03C17/42—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating of an organic material and at least one non-metal coating
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
- C03C27/06—Joining glass to glass by processes other than fusing
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
- C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
- G02B5/0825—Multilayer mirrors, i.e. having two or more reflecting layers the reflecting layers comprising dielectric materials only
- G02B5/0841—Multilayer mirrors, i.e. having two or more reflecting layers the reflecting layers comprising dielectric materials only comprising organic materials, e.g. polymers
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2217/00—Coatings on glass
- C03C2217/40—Coatings comprising at least one inhomogeneous layer
- C03C2217/42—Coatings comprising at least one inhomogeneous layer consisting of particles only
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2217/00—Coatings on glass
- C03C2217/40—Coatings comprising at least one inhomogeneous layer
- C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
- C03C2217/44—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the composition of the continuous phase
- C03C2217/445—Organic continuous phases
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2217/00—Coatings on glass
- C03C2217/40—Coatings comprising at least one inhomogeneous layer
- C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
- C03C2217/46—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase
- C03C2217/47—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase consisting of a specific material
- C03C2217/475—Inorganic materials
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2217/00—Coatings on glass
- C03C2217/70—Properties of coatings
- C03C2217/73—Anti-reflective coatings with specific characteristics
- C03C2217/734—Anti-reflective coatings with specific characteristics comprising an alternation of high and low refractive indexes
Definitions
- the present invention relates to laminated glass, and in particular, by defining the structure of the infrared reflecting layer and the relationship between the thermal shrinkage rates of the optical film and the transparent resin film, It is intended to provide a laminated glass that can be suppressed and has excellent infrared reflectance and translucency.
- laminated glass with high heat insulation or heat ray blocking properties has been distributed in the market for the purpose of blocking the heat felt by human skin due to the influence of sunlight entering from the car window, suppressing the operation of the air conditioner in the car, and saving energy. Yes.
- an optical film is disposed between a pair of glass substrates, and the optical film blocks transmission of heat rays (infrared rays) in sunlight, thereby reducing indoor temperature rise and cooling load.
- a heat insulating laminated glass in which a heat ray reflective film in which polyethylene naphthalate (PEN) and polymethyl methacrylate (PMMA) are alternately laminated is disposed between a pair of plate glasses.
- PEN polyethylene naphthalate
- PMMA polymethyl methacrylate
- a near-infrared reflective laminated glass is provided in which a near-infrared reflective substrate in which a plurality of dielectric films are laminated on a polymer resin sheet is disposed between a pair of plate glasses (for example, Patent Document 2). reference).
- the laminated glass described in Patent Document 1 is formed by alternately laminating PEN and PMMA in the heat ray reflective film.
- the difference between the thermal shrinkage rate of PEN and the thermal shrinkage rate of PMMA is large, Damage such as film peeling between layers may occur due to heating.
- the conventional laminated glass has another problem that when the infrared reflectance is improved, the translucency is lowered, and when the translucency is improved, the infrared reflectance is lowered.
- the present invention has been made in view of the above-mentioned problems, and a solution to the problem is that it is possible to suppress the occurrence of peeling between constituent layers and cracking of the infrared reflective layer due to heating, and excellent alignment with infrared reflectance and translucency. Is to provide glass.
- the infrared reflective layer provided on the transparent resin film is made of the first water-soluble binder resin and the first metal oxide particles.
- the infrared reflective layer contains a high refractive index layer containing a first water-soluble binder resin and first metal oxide particles, a second water-soluble binder resin and second metal oxide particles.
- the low refractive index layers are alternately stacked,
- a laminated glass, wherein a value obtained by dividing the thermal shrinkage of the optical film by the thermal shrinkage of the transparent resin film is in the range of 1 to 3.
- Item 3 The laminated glass according to Item 1 or Item 2, wherein the total number of layers in which the high refractive index layers and the low refractive index layers are alternately laminated is 11 to 31 layers.
- each of the high refractive index layer and the low refractive index layer constituting the infrared reflective layer contains a water-soluble binder resin, and the thermal shrinkage rate of the optical film and the infrared reflective layer.
- the difference in thermal shrinkage between the layers is not large, and it is assumed that delamination between layers and cracks in the infrared reflective layer due to the difference in thermal shrinkage between the layers are suppressed.
- the conventional laminated glass which does not contain a water-soluble binder resin and has an infrared reflective layer composed only of metal oxide particles has a haze because the outermost surface of the infrared reflective layer becomes uneven and the incident light is scattered.
- the translucency may increase and the translucency may decrease.
- the laminated glass which concerns on this invention contains water-soluble binder resin in the infrared reflective layer, the uneven
- the laminated glass of the present invention is presumed to have high translucency because the outermost surface of the infrared reflecting layer is smooth, light scattering is reduced and haze is reduced.
- the conventional laminated glass which does not contain a water-soluble binder resin and has an infrared reflecting layer formed by a method such as sputtering has a refractive index of about 1.0 between metal oxide particles (light goes straight).
- the laminated glass according to the present invention has a high infrared ray since a water-soluble binder resin having a refractive index of about 1.5 exists between the metal oxide particles constituting the infrared reflecting layer. It is assumed that it has a reflectance.
- the laminated glass of the present invention is a laminated glass having an optical film having at least one infrared reflective layer on a transparent resin film and a pair of glass substrates sandwiching the optical film.
- the infrared reflective layer is a first water-soluble layer.
- the high refractive index layer containing the conductive binder resin and the first metal oxide particles and the low refractive index layer containing the second water-soluble binder resin and the second metal oxide particles are alternately laminated.
- the value obtained by dividing the thermal shrinkage rate of the optical film by the thermal shrinkage rate of the transparent resin film is in the range of 1 to 3. This feature is a technical feature common to the inventions according to claims 1 to 4.
- this invention is provided with the infrared reflective layer on both surfaces of the transparent resin film.
- the total number of layers in which high refractive index layers and low refractive index layers are alternately laminated is preferably 11 to 31 layers.
- the first water-soluble binder resin is preferably ethylene-modified polyvinyl alcohol.
- ⁇ is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.
- FIG. 1 is a schematic cross-sectional view showing an example of the laminated glass of the present invention.
- a laminated glass 1 is composed of an optical film 2 and a pair of glass substrates 8A and 8B that sandwich the optical film 2.
- the optical film 2 has a high refractive index layer 5 containing the first water-soluble binder resin and the first metal oxide particles, the second water-soluble binder resin, and the second on the transparent resin film 3.
- Infrared reflective layer 4 in which low refractive index layers 6 containing metal oxide particles are alternately laminated.
- adhesive layers 7A and 7B are provided on both surfaces of the optical film 2, thereby being bonded to the pair of glass substrates 8A and 8B.
- the infrared reflecting layer 4 is provided on both sides of the transparent resin film 3, but may be provided only on one side of the transparent resin film 3.
- the laminated glass according to the present invention is configured such that the value obtained by dividing the thermal shrinkage rate of the optical film by the thermal shrinkage rate of the transparent resin film is in the range of 1 to 3.
- the heat shrinkage rate is measured as follows. After storing the sample (optical film or transparent resin film) at a temperature of 23 ° C. and a relative humidity of 55% RH for 24 hours, place two marks at intervals of 100 mm in the width direction, and between the two marks in the unloaded state. the distance L 1 measured using a microscope. Subsequently, the sample is suspended in an oven at 110 ° C. and left for 5 minutes. After 5 minutes, the sample is removed from the oven and stored again for 24 hours in an environment of temperature 23 ° C. and relative humidity 55% RH. Then, the distance L 2 between the two indicia of the no load samples is measured using a microscope.
- Thermal contraction rate (%) ((L 1 ⁇ L 2 ) / L 1 ) ⁇ 100
- the method for measuring the heat shrinkage rate is an example, and various conditions such as temperature, humidity, and time can be appropriately set and changed.
- the transparent resin film and the infrared reflective layer in order to adjust the value obtained by dividing the heat shrinkage rate of the optical film by the heat shrinkage rate of the transparent resin film within the range of 1 to 3, the transparent resin film and the infrared reflective layer This can be achieved by changing the material or layer thickness, or changing the total number of layers in which the high refractive index layer and the low refractive index layer constituting the infrared reflection layer are alternately laminated. It can also be achieved by changing the component ratio of the material contained in each constituent layer.
- an infrared absorption layer may be further provided as necessary.
- a heat insulating layer may be further provided as necessary.
- a hard coat layer may be further provided as necessary.
- the glass substrate constituting the laminated glass of the present invention may be a flat laminated glass or a curved laminated glass used for a windshield of a car.
- the laminated glass of the present invention preferably has a visible light transmittance of 70% or more, particularly when used as a car window glass.
- the visible light transmittance can be measured by using, for example, a spectrophotometer (U-4000 type, manufactured by Hitachi, Ltd.), JIS R3106 (1998) “Test of transmittance, reflectance, and solar heat gain of plate glass” It can be measured according to “Method”.
- the optical film used for the laminated glass according to the present invention has a configuration having at least one infrared reflection layer on at least a transparent resin film, and more preferably has an infrared reflection layer on both sides of the transparent resin film.
- the material, thickness, etc. are set so that the value obtained by dividing the thermal shrinkage rate of the optical film by the thermal shrinkage rate of the transparent resin film is in the range of 1 to 3. is there.
- the optical film according to the present invention only needs to have a transparent resin film and an infrared reflection layer, and may include other constituent layers as necessary, for example, an infrared absorption layer, a heat insulation layer, and a hard coat layer. it can.
- the total thickness of the optical film according to the present invention is preferably in the range of 30 to 200 ⁇ m, more preferably in the range of 40 to 150 ⁇ m, and still more preferably 40 to 125 ⁇ m.
- the visible light transmittance measured by JIS R 3106 is preferably 60% or more, more preferably 70% or more, and further preferably 80% or more. is there.
- the region having a wavelength of 900 nm to 1400 nm has a region with a reflectance exceeding 50%.
- the transparent resin film used for the laminated glass according to the present invention serves as a support for the optical film.
- the material, thickness, etc. are set so that the value obtained by dividing the thermal shrinkage rate of the optical film by the thermal shrinkage rate of the transparent resin film is in the range of 1 to 3. It is.
- the thickness of the transparent resin film according to the present invention is preferably in the range of 30 to 200 ⁇ m, more preferably in the range of 30 to 150 ⁇ m, and most preferably in the range of 35 to 125 ⁇ m. If the thickness is 30 ⁇ m or more, wrinkles during handling are less likely to occur, and if the thickness is 200 ⁇ m or less, the ability to follow a curved glass surface is improved when bonded to glass, and wrinkles are less likely to occur. Become.
- the transparent resin film according to the present invention is preferably a biaxially oriented polyester film.
- an unstretched or at least one stretched polyester film may be used. it can.
- a stretched film is preferable from the viewpoint of strength improvement and thermal expansion suppression. In particular, when used as a windshield of an automobile, a stretched film is more preferable.
- the transparent resin film applied to the laminated glass of the present invention is not particularly limited as long as it is transparent, and various resin films can be used.
- a polyolefin film for example, polyethylene, polypropylene, etc.
- a polyester film for example, polyethylene terephthalate, polyethylene naphthalate, etc.
- polyvinyl chloride cellulose triacetate, polyimide, polybutyral film, cycloolefin polymer film, transparent cellulose nanofiber film, and the like
- a polyester film is preferable.
- polyester film which has the film formation property which has a dicarboxylic acid component and a diol component as main structural components.
- the main constituent dicarboxylic acid components include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, diphenylsulfone dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenylethanedicarboxylic acid, Examples thereof include cyclohexane dicarboxylic acid, diphenyl dicarboxylic acid, diphenyl thioether dicarboxylic acid, diphenyl ketone dicarboxylic acid, and phenylindane dicarboxylic acid.
- diol component examples include ethylene glycol, propylene glycol, tetramethylene glycol, cyclohexanedimethanol, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxyethoxyphenyl) propane, bis ( 4-Hydroxyphenyl) sulfone, bisphenol fluorene hydroxyethyl ether, diethylene glycol, neopentyl glycol, hydroquinone, cyclohexanediol and the like.
- polyesters having these as main components from the viewpoints of transparency, mechanical strength, dimensional stability, etc., dicarboxylic acid components such as terephthalic acid, 2,6-naphthalenedicarboxylic acid, diol components such as ethylene glycol and 1 Polyester having 1,4-cyclohexanedimethanol as the main constituent is preferred.
- polyesters mainly composed of polyethylene terephthalate and polyethylene naphthalate, copolymerized polyesters composed of terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol, and mixtures of two or more of these polyesters are mainly used. Polyester as a constituent component is preferable.
- the transparent resin film according to the present invention may contain particles under conditions that do not impair transparency in order to facilitate handling.
- particles used in the present invention include inorganic particles such as calcium carbonate, calcium phosphate, silica, kaolin, talc, titanium dioxide, alumina, barium sulfate, calcium fluoride, lithium fluoride, zeolite, molybdenum sulfide, and crosslinked polymers. Examples thereof include organic particles such as particles and calcium oxalate.
- the method of adding particles include a method of adding particles in the resin material as a raw material and a method of adding them directly to an extruder. One of these methods is adopted. Alternatively, two methods may be used in combination.
- additives may be added in addition to the above particles as necessary. Examples of such additives include stabilizers, lubricants, cross-linking agents, anti-blocking agents, antioxidants, dyes, pigments, and ultraviolet absorbers.
- the transparent resin film can be produced by a conventionally known general method.
- an unstretched transparent resin film that is substantially amorphous and not oriented can be produced by melting a resin as a material with an extruder, extruding it with an annular die or a T-die, and quenching.
- the unstretched transparent resin film is uniaxially stretched, tenter-type sequential biaxial stretching, tenter-type simultaneous biaxial stretching, tubular simultaneous biaxial stretching, and other known methods such as transparent resin film flow (vertical axis) direction.
- a stretched transparent resin film can be produced by stretching in the direction perpendicular to the flow direction of the transparent resin film (horizontal axis).
- the draw ratio in this case can be appropriately selected according to the resin that is the raw material of the transparent resin film, but is preferably 2 to 10 times in the vertical axis direction and the horizontal axis direction.
- the transparent resin film may be subjected to relaxation treatment or offline heat treatment in terms of dimensional stability.
- the relaxation treatment is performed in a process from the heat setting in the stretching process of the polyester film to the winding in the transversely stretched tenter or after exiting the tenter.
- the relaxation treatment is preferably performed at a treatment temperature of 80 to 200 ° C., more preferably a treatment temperature of 100 to 180 ° C.
- the relaxation rate is preferably in the range of 0.1 to 10% in both the longitudinal direction and the width direction, and more preferably, the relaxation rate is 2 to 6%.
- the relaxed base material is subjected to the following off-line heat treatment to improve heat resistance and to improve dimensional stability.
- the transparent resin film is preferably coated with the undercoat layer coating solution in-line on one or both sides during the film forming process.
- undercoating during the film forming process is referred to as in-line undercoating.
- resins used in the undercoat layer coating solution useful in the present invention include polyester resins, acrylic-modified polyester resins, polyurethane resins, acrylic resins, vinyl resins, vinylidene chloride resins, polyethyleneimine vinylidene resins, polyethyleneimine resins, and polyvinyl alcohol resins. , Modified polyvinyl alcohol resin, gelatin and the like, and any of them can be preferably used.
- a conventionally well-known additive can also be added to these undercoat layers.
- the undercoat layer can be coated by a known method such as roll coating, gravure coating, knife coating, dip coating or spray coating.
- the coating amount of the undercoat layer is preferably about 0.01 to 2 g / m 2 (dry state).
- the infrared reflective layer expresses the function of blocking sunlight, particularly infrared components.
- the infrared reflective layer contains a high refractive index layer containing the first water-soluble binder resin and the first metal oxide particles, a second water-soluble binder resin and the second metal oxide particles.
- the laminated body is formed by alternately laminating the low refractive index layer to be formed on the transparent resin film described above.
- the thickness per layer of the high refractive index layer is preferably 20 to 800 nm, and more preferably 50 to 500 nm.
- the thickness of the low refractive index layer per layer is preferably 20 to 800 nm, and more preferably 50 to 500 nm.
- the high refractive index layer and the low refractive index layer may have a clear interface between them or may have a structure in which the composition changes continuously.
- the maximum refractive index minus the minimum refractive index ⁇ n in the region where the respective layers are mixed and the refractive index continuously changes.
- a point of refractive index + ⁇ n / 2 is regarded as a layer interface. The same applies to the layer thickness of the low refractive index layer described later.
- the metal oxide concentration profile of the infrared reflective layer formed by alternately laminating the high refractive index layer and the low refractive index layer is etched from the surface to the depth direction using a sputtering method, and XPS Using a surface analyzer, the outermost surface is set to 0 nm, sputtering is performed at a rate of 0.5 nm / min, and the atomic composition ratio can be measured. It is also possible to confirm the cut surface by cutting the laminated film and measuring the atomic composition ratio with an XPS surface analyzer. In the mixed region, when the concentration of the metal oxide changes discontinuously, the boundary can be confirmed by a tomographic photograph using an electron microscope (TEM).
- TEM electron microscope
- the XPS surface analyzer is not particularly limited and any model can be used.
- ESCALAB-200R manufactured by VG Scientific, Inc. can be used.
- Mg is used for the X-ray anode, and measurement is performed at an output of 600 W (acceleration voltage: 15 kV, emission current: 40 mA).
- the total number of the high refractive index layer and the low refractive index layer is preferably in the range of 6 to 50 layers, more preferably in the range of 8 to 40, from the viewpoint of productivity. Within the range of layers, more preferably within the range of 9 to 30 layers. Further, from the viewpoint of infrared reflectivity and translucency, and suppression of film peeling and cracking due to heating, the total number of high refractive index layers and low refractive index layers is preferably 11 to 31 layers.
- the difference in refractive index between the adjacent high refractive index layer and low refractive index layer is preferably 0.1 or more, more preferably 0.3 or more, still more preferably 0.35 or more, particularly preferably. Is 0.4 or more.
- the outermost layer and the lowermost layer a configuration outside the above preferred range may be used.
- the reflectance in a specific wavelength region is determined by the difference in refractive index between two adjacent layers and the number of layers, and the larger the difference in refractive index, the same reflectance can be obtained with a smaller number of layers.
- the refractive index difference and the required number of layers can be calculated using commercially available optical design software. For example, in order to obtain a near-infrared reflectance of 90% or more, if the difference in refractive index is smaller than 0.1, it is necessary to laminate 200 layers or more, which not only reduces productivity, but also at the lamination interface. Scattering increases, transparency decreases, and it becomes very difficult to manufacture without failure. From the standpoint of improving reflectivity and reducing the number of layers, there is no upper limit to the difference in refractive index, but practically about 1.4 is the limit.
- a layer structure in which the lowermost layer adjacent to the transparent resin film is a low refractive index layer is preferable from the viewpoint of adhesion to the transparent resin film.
- the first and second water-soluble binder resins contained in the high refractive index layer or the low refractive index layer are preferably polyvinyl alcohol. Moreover, it is preferable that the saponification degree of the polyvinyl alcohol contained in the high refractive index layer is different from the saponification degree of the polyvinyl alcohol contained in the low refractive index layer. Furthermore, the first metal oxide particles contained in the high refractive index layer are preferably titanium oxide particles surface-treated with a silicon-containing hydrated oxide.
- the high refractive index layer according to the present invention contains a first water-soluble binder resin and first metal oxide particles, and if necessary, a curing agent, other binder resins, and an interface. An activator, various additives, and the like may be further included.
- the refractive index of the high refractive index layer according to the present invention is preferably 1.80 to 2.50, more preferably 1.90 to 2.20.
- the first water-soluble binder resin is dissolved in water at a concentration of 0.5% by mass at the temperature at which the first water-soluble binder resin is most dissolved.
- the mass of the insoluble matter filtered off when filtered through a G2 glass filter is within 50 mass% of the added water-soluble binder resin.
- the weight average molecular weight of the first water-soluble binder resin according to the present invention is preferably in the range of 1,000 to 200,000. Further, it is more preferably within the range of 3000 to 40000.
- the weight average molecular weight as used in the present invention can be measured by a known method, for example, static light scattering, gel permeation chromatography (GPC), time-of-flight mass spectrometry (TOF-MASS), etc. In the present invention, it is measured by a gel permeation chromatography method which is a generally known method.
- the content of the first water-soluble binder resin in the high refractive index layer is preferably within the range of 5 to 50% by mass with respect to the solid content of 100% by mass of the high refractive index layer. It is more preferable to be within the range.
- the first water-soluble binder resin applied to the high refractive index layer is preferably polyvinyl alcohol.
- the 2nd water-soluble binder resin which exists in the low-refractive-index layer mentioned later is also polyvinyl alcohol. Therefore, in the following, polyvinyl alcohol contained in the high refractive index layer and the low refractive index layer will be described together.
- the high refractive index layer and the low refractive index layer preferably contain two or more types of polyvinyl alcohol having different saponification degrees.
- polyvinyl alcohol (A) is used as the first water-soluble binder resin used in the high refractive index layer
- polyvinyl alcohol as the second water-soluble binder resin used in the low refractive index layer.
- B polyvinyl alcohol
- each refractive index layer contains a plurality of polyvinyl alcohols having different saponification degrees and polymerization degrees
- the polyvinyl alcohol having the highest content in each refractive index layer is changed to polyvinyl alcohol (A ) And polyvinyl alcohol (B) in the low refractive index layer.
- the “degree of saponification” is the ratio of hydroxy groups to the total number of acetyloxy groups (derived from the starting vinyl acetate) and hydroxy groups in polyvinyl alcohol.
- the degree of polymerization is calculated assuming that the polyvinyl alcohol having a saponification degree difference of 3 mol% or less is the same polyvinyl alcohol. .
- a low polymerization degree polyvinyl alcohol having a polymerization degree of 1000 or less is a different polyvinyl alcohol (even if there is a polyvinyl alcohol having a saponification degree difference of 3 mol% or less, it is not regarded as the same polyvinyl alcohol).
- polyvinyl alcohol having a saponification degree of 90 mol%, a saponification degree of 91 mol%, and a saponification degree of 93 mol% is contained in the same layer by 10 mass%, 40 mass%, and 50 mass%, respectively.
- These three polyvinyl alcohols are the same polyvinyl alcohol, and the mixture of these three is polyvinyl alcohol (A) or (B).
- the above-mentioned “polyvinyl alcohol having a saponification degree difference of 3 mol% or less” suffices to be within 3 mol% when attention is paid to any polyvinyl alcohol.
- polyvinyl alcohol when paying attention to 91 mol% of polyvinyl alcohol, the difference in saponification degree of any polyvinyl alcohol is within 3 mol%, so that the same polyvinyl alcohol is obtained.
- polyvinyl alcohol having a saponification degree different by 3 mol% or more is contained in the same layer, it is regarded as a mixture of different polyvinyl alcohols, and the polymerization degree and the saponification degree are calculated for each.
- PVA203 5% by mass
- PVA117 25% by mass
- PVA217 10% by mass
- PVA220 10% by mass
- PVA224 10% by mass
- PVA235 20% by mass
- PVA245 20% by mass
- the difference in the absolute value of the saponification degree between the polyvinyl alcohol (A) and the polyvinyl alcohol (B) is preferably 3 mol% or more, and more preferably 5 mol% or more. If it is such a range, since the interlayer mixing state of a high refractive index layer and a low refractive index layer will become a preferable level, it is preferable. Moreover, although the difference of the saponification degree of polyvinyl alcohol (A) and polyvinyl alcohol (B) is so preferable that it is separated, it is 20 mol% or less from the viewpoint of the solubility to water of polyvinyl alcohol. It is preferable.
- the saponification degree of polyvinyl alcohol (A) and polyvinyl alcohol (B) is preferably 75 mol% or more from the viewpoint of solubility in water. Furthermore, the intermixed state of the high refractive index layer and the low refractive index layer is that one of the polyvinyl alcohol (A) and the polyvinyl alcohol (B) has a saponification degree of 90 mol% or more and the other is 90 mol% or less. Is preferable for achieving a preferable level. It is more preferable that one of the polyvinyl alcohol (A) and the polyvinyl alcohol (B) has a saponification degree of 95 mol% or more and the other is 90 mol% or less. In addition, although the upper limit of the saponification degree of polyvinyl alcohol is not specifically limited, Usually, it is less than 100 mol% and is about 99.9 mol% or less.
- the polymerization degree of the two types of polyvinyl alcohols having different saponification degrees is preferably 1000 or more, particularly preferably those having a polymerization degree in the range of 1500 to 5000, more preferably in the range of 2000 to 5000. Those are more preferably used. This is because when the polymerization degree of polyvinyl alcohol is 1000 or more, there is no cracking of the coating film, and when it is 5000 or less, the coating solution is stabilized. In the present specification, “the coating solution is stable” means that the coating solution is stable over time.
- the degree of polymerization of at least one of polyvinyl alcohol (A) and polyvinyl alcohol (B) is in the range of 2000 to 5000, it is preferable because cracks in the coating film are reduced and the reflectance at a specific wavelength is improved. It is preferable that both the polyvinyl alcohol (A) and the polyvinyl alcohol (B) are 2000 to 5000, since the above effects can be exhibited more remarkably.
- the “degree of polymerization” as used herein refers to the viscosity average degree of polymerization, which is measured according to JIS K6726 (1994), and is the limit measured in water at 30 ° C. after completely resaponifying and purifying PVA. From the viscosity [ ⁇ ] (dl / g), it is obtained by the following formula (1).
- Formula (1) P ([ ⁇ ] ⁇ 10 3 /8.29) (1 / 0.62)
- the polyvinyl alcohol (B) contained in the low refractive index layer preferably has a saponification degree in the range of 75 to 90 mol% and a polymerization degree in the range of 2000 to 5000.
- polyvinyl alcohol having such characteristics is contained in the low refractive index layer, it is preferable in that interfacial mixing is further suppressed. This is considered to be because there are few cracks of a coating film and set property improves.
- the polyvinyl alcohol (A) and (B) used in the present invention may be a synthetic product or a commercially available product.
- Examples of commercially available products used as the polyvinyl alcohol (A) and (B) include, for example, PVA-102, PVA-103, PVA-105, PVA-110, PVA-117, PVA-120, PVA-124, PVA -203, PVA-205, PVA-210, PVA-217, PVA-220, PVA-224, PVA-235 (manufactured by Kuraray Co., Ltd.), JC-25, JC-33, JF-03, JF-04 , JF-05, JP-03, JP-04JP-05, JP-45 (above, manufactured by Nihon Vinegar Pover Co., Ltd.) and the like.
- the water-soluble binder resin according to the present invention may contain modified polyvinyl alcohol partially modified in addition to ordinary polyvinyl alcohol obtained by hydrolysis of polyvinyl acetate. good.
- modified polyvinyl alcohol partially modified in addition to ordinary polyvinyl alcohol obtained by hydrolysis of polyvinyl acetate.
- the adhesion, water resistance, and flexibility of the film may be improved.
- modified polyvinyl alcohol include cation modified polyvinyl alcohol, anion modified polyvinyl alcohol, nonionic modified polyvinyl alcohol, and vinyl alcohol polymers.
- Examples of the cation-modified polyvinyl alcohol include primary to tertiary amino groups and quaternary ammonium groups in the main chain or side chain of the polyvinyl alcohol as described in JP-A-61-10383. It is obtained by saponifying a copolymer of an ethylenically unsaturated monomer having a cationic group and vinyl acetate.
- Examples of the ethylenically unsaturated monomer having a cationic group include trimethyl- (2-acrylamido-2,2-dimethylethyl) ammonium chloride and trimethyl- (3-acrylamido-3,3-dimethylpropyl) ammonium chloride.
- the ratio of the cation-modified group-containing monomer in the cation-modified polyvinyl alcohol is 0.1 to 10 mol%, preferably 0.2 to 5 mol%, relative to vinyl acetate.
- Anion-modified polyvinyl alcohol is described in, for example, polyvinyl alcohol having an anionic group as described in JP-A-1-206088, JP-A-61-237681 and JP-A-63-307979.
- examples thereof include a copolymer of vinyl alcohol and a vinyl compound having a water-soluble group, and a modified polyvinyl alcohol having a water-soluble group as described in JP-A-7-285265.
- Nonionic modified polyvinyl alcohol includes, for example, a polyvinyl alcohol derivative in which a polyalkylene oxide group is added to a part of vinyl alcohol as described in JP-A-7-9758, and JP-A-8-25795.
- Block copolymer of vinyl compound having hydrophobic group and vinyl alcohol, silanol-modified polyvinyl alcohol having silanol group, reactive group modification having reactive group such as acetoacetyl group, carbonyl group and carboxy group Polyvinyl alcohol etc. are mentioned.
- vinyl alcohol polymers examples include EXEVAL (registered trademark, manufactured by Kuraray Co., Ltd.) and Nichigo G polymer (registered trademark, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.).
- modified polyvinyl alcohol Two or more types can be used in combination, such as the degree of polymerization and the type of modification.
- the content of the modified polyvinyl alcohol is not particularly limited, but is preferably 1 to 30% by mass with respect to the total mass (solid content) of each refractive index. If it is such a range, the said effect will be exhibited more.
- polyvinyl alcohol (A) having a low saponification degree is used for the high refractive index layer and polyvinyl alcohol (B) having a high saponification degree is used for the low refractive index layer
- the polyvinyl alcohol ( A) is preferably contained in the range of 40% by mass to 100% by mass with respect to the total mass of all polyvinyl alcohols in the layer, more preferably 60% by mass to 95% by mass
- the low refractive index layer The polyvinyl alcohol (B) is preferably contained in the range of 40% by mass to 100% by mass with respect to the total mass of all the polyvinyl alcohols in the low refractive index layer, and 60% by mass to 95% by mass.
- the polyvinyl alcohol (A) having a high saponification degree is used for the high refractive index layer and polyvinyl alcohol (B) having a low saponification degree is used for the low refractive index layer
- the polyvinyl alcohol ( A) is preferably contained in the range of 40% by mass to 100% by mass with respect to the total mass of all polyvinyl alcohols in the layer, more preferably 60% by mass to 95% by mass
- the low refractive index layer The polyvinyl alcohol (B) is preferably contained in the range of 40% by mass to 100% by mass with respect to the total mass of all the polyvinyl alcohols in the low refractive index layer, and 60% by mass to 95% by mass. More preferred.
- the content is 40% by mass or more, interlayer mixing is suppressed, and the effect of less disturbance of the interface appears remarkably. On the other hand, if content is 100 mass% or less, stability of a coating liquid will improve.
- the first water-soluble binder resin other than polyvinyl alcohol is a high refractive index layer containing the first metal oxide particles. Any film can be used as long as it can form a coating film. Also in the low refractive index layer described later, as the second water-soluble binder resin other than polyvinyl alcohol, the low refractive index layer containing the second metal oxide particles forms a coating film as described above. Anything can be used without limitation. However, in view of environmental problems and flexibility of the coating film, water-soluble polymers (particularly gelatin, thickening polysaccharides, polymers having reactive functional groups) are preferable. These water-soluble polymers may be used alone or in combination of two or more.
- the content of the other binder resin used in combination with polyvinyl alcohol preferably used as the first water-soluble binder resin is 5 to 50 mass with respect to 100 mass% of the solid content of the high refractive index layer. % Can also be used.
- the binder resin is preferably composed of a water-soluble polymer. That is, in the present invention, a water-soluble polymer other than polyvinyl alcohol and modified polyvinyl alcohol may be used as the binder resin in addition to the polyvinyl alcohol and modified polyvinyl alcohol as long as the effect is not impaired.
- the water-soluble polymer is when it is filtered through a G2 glass filter (maximum pores 40-50 ⁇ m) when dissolved in water at a concentration of 0.5% by mass at the temperature at which the water-soluble polymer is most dissolved.
- the mass of the insoluble matter separated by filtration is within 50% by mass of the added water-soluble polymer.
- gelatin, celluloses, thickening polysaccharides, or polymers having reactive functional groups are particularly preferable. These water-soluble polymers may be used alone or in combination of two or more.
- gelatin As the gelatin applicable to the present invention, various gelatins that have been widely used in the field of silver halide photographic light-sensitive materials can be applied. For example, in addition to acid-processed gelatin and alkali-processed gelatin, production of gelatin is possible. Enzyme-treated gelatin and gelatin derivatives that undergo enzyme treatment in the process, that is, modified with a reagent that has an amino group, imino group, hydroxyl group, carboxyl group as a functional group in the molecule and a group that can react with it. It may be what you did. The general method for producing gelatin is well known and is described, for example, in T.W. H. James: The Theory of Photographic Process 4th. ed.
- gelatin hardener When gelatin is used, a gelatin hardener can be added as necessary.
- known compounds that are used as hardeners for ordinary photographic emulsion layers can be used. For example, vinyl sulfone compounds, urea-formalin condensates, melanin-formalin condensates, epoxy compounds And organic hardeners such as aziridine compounds, active olefins and isocyanate compounds, and inorganic polyvalent metal salts such as chromium, aluminum and zirconium.
- water-soluble cellulose derivatives can be preferably used.
- water-soluble cellulose derivatives such as carboxymethyl cellulose (cellulose carboxymethyl ether), methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose.
- examples thereof include cellulose derivatives, carboxymethyl cellulose (cellulose carboxymethyl ether) and carboxyethyl cellulose which are carboxylic acid group-containing celluloses.
- Other examples include cellulose derivatives such as nitrocellulose, cellulose acetate propionate, cellulose acetate, and cellulose sulfate.
- the thickening polysaccharide that can be used in the present invention is not particularly limited, and examples thereof include generally known natural simple polysaccharides, natural complex polysaccharides, synthetic simple polysaccharides, and synthetic complex polysaccharides. The details of these polysaccharides can be referred to “Biochemical Encyclopedia (2nd edition), Tokyo Chemical Doujinshi”, “Food Industry”, Vol. 31 (1988), p.
- the thickening polysaccharide referred to in the present invention is a saccharide polymer having a large number of hydrogen bonding groups in the molecule. Due to the difference in hydrogen bonding strength between molecules depending on the temperature, the viscosity at low temperature and the viscosity at high temperature are It is a polysaccharide with the characteristic that the viscosity difference is large. Furthermore, when metal oxide fine particles are added to this thickening polysaccharide, the viscosity rises due to hydrogen bonding with the metal oxide fine particles at low temperatures.
- the increase in viscosity is 1.0 mPa ⁇ s or more at 15 ° C., preferably 5.0 mPa ⁇ s or more, and more preferably 10.0 mPa ⁇ s or more.
- thickening polysaccharides include, for example, galactan (eg, agarose, agaropectin, etc.), galactomannoglycan (eg, locust bean gum, guaran, etc.), xyloglucan (eg, tamarind gum, etc.), Glucomannoglycan (eg, salmon mannan, wood-derived glucomannan, xanthan gum, etc.), galactoglucomannoglycan (eg, softwood-derived glycan), arabinogalactoglycan (eg, soybean-derived glycan, microorganism-derived glycan, etc.), Red algae such as glucuronoglycan (eg gellan gum), glycosaminoglycan (eg hyaluronic acid, keratan sulfate etc.), alginic acid and alginates, agar, ⁇ -carrageenan, ⁇ -carrageenan
- Such polysaccharides include, for example, pentoses such as L-arabitose, D-ribose, 2-deoxyribose, and D-xylose, and hexoses such as D-glucose, D-fructose, D-mannose, and D-galactose only. It is preferable that it is a polysaccharide.
- tamarind seed gum known as xyloglucan whose main chain is glucose and side chain is glucose
- guar gum known as galactomannan whose main chain is mannose and side chain is glucose
- cationized guar gum Hydroxypropyl guar gum
- locust bean gum locust bean gum
- tara gum arabinogalactan whose main chain is galactose and whose side chain is arabinose
- tamarind, guar gum, cationized guar gum, and hydroxypropyl guar gum are particularly preferable.
- two or more thickening polysaccharides can be used in combination.
- water-soluble polymer examples include polymers having a reactive functional group, such as polyvinylpyrrolidones, polyacrylic acid, acrylic acid-acrylonitrile copolymer, potassium acrylate-acrylonitrile.
- Acrylic resins such as copolymers, vinyl acetate-acrylic acid ester copolymers, or acrylic acid-acrylic acid ester copolymers, styrene-acrylic acid copolymers, styrene-methacrylic acid copolymers, styrene-methacrylic acid -Styrene acrylic resins such as acrylate copolymer, styrene- ⁇ -methylstyrene-acrylic acid copolymer, or styrene- ⁇ -methylstyrene-acrylic acid-acrylic acid ester copolymer, styrene-styrene sulfonic acid Sodium copolymer, styrene-2-hydroxyethyl Acrylate copolymer, styrene-2-hydroxyethyl acrylate-potassium styrene sulfonate copolymer, styrene-maleic acid copoly
- (1-2) First Metal Oxide Particles As the first metal oxide particles applicable to the high refractive index layer according to the present invention, a metal oxide having a refractive index of 2.0 or more and 3.0 or less.
- Product particles are preferred. More specifically, for example, titanium oxide, zirconium oxide, zinc oxide, synthetic amorphous silica, colloidal silica, alumina, colloidal alumina, lead titanate, red lead, yellow lead, zinc yellow, chromium oxide, oxidized oxide Examples thereof include ferric iron, iron black, copper oxide, magnesium oxide, magnesium hydroxide, strontium titanate, yttrium oxide, niobium oxide, europium oxide, lanthanum oxide, zircon, and tin oxide.
- composite oxide particles composed of a plurality of metals, core / shell particles whose metal structure changes into a core / shell shape, and the like can also be used.
- the high refractive index layer according to the present invention includes metal oxide fine particles having a high refractive index such as titanium and zirconium, that is, titanium oxide fine particles and It is preferable to contain zirconia oxide fine particles.
- titanium oxide is more preferable from the viewpoint of the stability of the coating liquid for forming the high refractive index layer.
- the rutile type tetragonal type
- the weather resistance of the high refractive index layer and adjacent layers is higher, and the refractive index is higher. Is more preferable.
- the silicon-containing hydrated oxide of the shell layer and the first water-soluble binder resin Core-shell particles in which titanium oxide particles are coated with a silicon-containing hydrated oxide are more preferred because of the effect of suppressing intermixing between the high refractive index layer and the adjacent layer due to the interaction.
- the aqueous solution containing titanium oxide particles used for the core of the core-shell particles according to the present invention has a surface of an aqueous titanium oxide sol having a pH of 1.0 to 3.0 and a positive zeta potential of the titanium particles. It is preferable to use a hydrophobized and dispersible state in an organic solvent.
- the content of the first metal oxide particles according to the present invention is 15 to 80% by mass with respect to the solid content of 100% by mass of the high refractive index layer, a difference in refractive index from the low refractive index layer is imparted. It is preferable from the viewpoint. Furthermore, it is more preferably 20 to 77% by mass, and further preferably 30 to 75% by mass.
- the content when the metal oxide particles other than the core / shell particles are contained in the high refractive index layer according to the present invention is particularly limited as long as the effects of the present invention can be obtained. It is not a thing.
- the volume average particle diameter of the first metal oxide particles applied to the high refractive index layer is preferably 30 nm or less, more preferably 1 to 30 nm, and more preferably 5 to 15 nm. Is more preferable.
- a volume average particle size of 1 nm or more and 30 nm or less is preferable from the viewpoint of low haze and excellent visible light transmittance.
- the volume average particle size of the first metal oxide particles according to the present invention refers to a method of observing the particles themselves using a laser diffraction scattering method, a dynamic light scattering method, or an electron microscope,
- a curing agent can be used to cure the first water-soluble binder resin applied to the high refractive index layer.
- the curing agent that can be used together with the first water-soluble binder resin is not particularly limited as long as it causes a curing reaction with the first water-soluble binder resin.
- boric acid and its salt are preferable as the curing agent.
- known ones can be used, and in general, a compound having a group capable of reacting with polyvinyl alcohol or a compound that promotes the reaction between different groups possessed by polyvinyl alcohol. Select and use.
- the curing agent include, for example, an epoxy curing agent (for example, diglycidyl ethyl ether, ethylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-diglycidyl cyclohexane, N, N— Diglycidyl-4-glycidyloxyaniline, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, etc.), aldehyde curing agents (eg, formaldehyde, glioxal, etc.), active halogen curing agents (eg, 2,4-dichloro-4-hydroxy) -1,3,5, -s-triazine, etc.), active vinyl compounds (for example, 1,3,5-trisacryloyl-hexahydro-s-triazine, bisvinylsulfonylmethyl ether, etc.), aluminum alum, etc.
- Boric acid and salts thereof refer to oxygen acids and salts thereof having a boron atom as a central atom, specifically, orthoboric acid, diboric acid, metaboric acid, tetraboric acid, pentaboric acid, and octaboron. Examples include acids and their salts.
- the low refractive index layer according to the present invention includes a second water-soluble binder resin and second metal oxide particles, and further includes a curing agent, a surface coating component, a particle surface protective agent, A binder resin, a surfactant, various additives, and the like may be included.
- the refractive index of the low refractive index layer according to the present invention is preferably 1.10 to 1.60, more preferably 1.30 to 1.50.
- polyvinyl alcohol is preferably used as the second water-soluble binder resin applied to the low refractive index layer according to the present invention. Furthermore, it is more preferable that polyvinyl alcohol (B) different from the saponification degree of polyvinyl alcohol (A) present in the high refractive index layer is used in the low refractive index layer according to the present invention.
- polyvinyl alcohol and polyvinyl alcohol (B) such as a preferable weight average molecular weight of 2nd water-soluble binder resin here, is demonstrated by the 1st water-soluble binder resin of the said high refractive index layer. The description is omitted here.
- the content of the second water-soluble binder resin in the low refractive index layer is preferably 20 to 99.9% by mass, and 25 to 80% by mass with respect to 100% by mass of the solid content of the low refractive index layer. More preferably.
- any method can be used as long as the low refractive index layer containing metal oxide particles can form a coating film. Anything can be used without limitation.
- water-soluble polymers particularly gelatin, thickening polysaccharides, polymers having reactive functional groups
- These water-soluble polymers may be used alone or in combination of two or more.
- the content of the other binder resin used together with polyvinyl alcohol preferably used as the second water-soluble binder resin is 0 to 10 mass with respect to 100 mass% of the solid content of the low refractive index layer. % Can also be used.
- the low refractive index layer of the optical film according to the present invention may contain water-soluble polymers such as celluloses, thickening polysaccharides, and polymers having reactive functional groups. These water-soluble polymers such as celluloses, thickening polysaccharides and polymers having reactive functional groups are the same as the water-soluble polymers described in the high refractive index layer described above. Is omitted.
- silica silica (silicon dioxide) is preferably used, and a specific example is synthesized. Examples thereof include amorphous silica and colloidal silica. Of these, acidic colloidal silica sol is more preferably used, and colloidal silica sol dispersed in an organic solvent is more preferably used. Further, in order to further reduce the refractive index, hollow fine particles having pores inside the particles can be used as the second metal oxide particles applied to the low refractive index layer, particularly silica (silicon dioxide). The hollow fine particles are preferred.
- the second metal oxide particles (preferably silicon dioxide) applied to the low refractive index layer preferably have an average particle size of 3 to 100 nm.
- the average particle diameter of primary particles of silicon dioxide dispersed in a primary particle state is more preferably 3 to 50 nm, and further preferably 3 to 40 nm. It is particularly preferably 3 to 20 nm, and most preferably 4 to 10 nm.
- grains it is preferable from a viewpoint with few hazes and excellent visible light transmittance
- the average particle diameter of the second metal oxide fine particles applied to the low refractive index layer is determined by observing the particles themselves or the particles appearing on the cross section or surface of the refractive index layer with an electron microscope, and the particle diameter of 1000 arbitrary particles. Is obtained as a simple average value (number average).
- the particle size of each particle is represented by a diameter assuming a circle equal to the projected area.
- the colloidal silica used in the present invention is obtained by heating and aging a silica sol obtained by metathesis with an acid of sodium silicate or the like and passing through an ion exchange resin layer.
- a silica sol obtained by metathesis JP-A-61-20792, JP-A-61-188183, JP-A-63-17807, JP-A-4-93284 JP-A-5-278324, JP-A-6-92011, JP-A-6-183134, JP-A-6-297830, JP-A-7-81214, JP-A-7-101142 Disclosed in JP-A-7-179029, JP-A-7-137431, and International Publication No. 94/26530 A.
- Such colloidal silica may be a synthetic product or a commercial product.
- the surface of the colloidal silica may be cation-modified, or may be treated with Al, Ca, Mg, Ba or the
- Hollow particles can also be used as the second metal oxide particles applied to the low refractive index layer.
- the average particle pore size is preferably 3 to 70 nm, more preferably 5 to 50 nm, and even more preferably 5 to 45 nm.
- the average particle pore diameter of the hollow particles is the average value of the inner diameters of the hollow particles.
- the refractive index of the low refractive index layer is sufficiently lowered.
- the average particle diameter is 50 or more at random, which can be observed as an ellipse in a circular, elliptical or substantially circular shape by electron microscope observation. Is obtained.
- the average particle hole diameter means the smallest distance among the distances between the outer edges of the hole diameter that can be observed as a circle, an ellipse, or a substantially circle or ellipse, between two parallel lines.
- the second metal oxide particles applied to the low refractive index layer may be surface-coated with a surface coating component.
- the content of the second metal oxide particles in the low refractive index layer is preferably 0.1 to 70% by mass, and preferably 30 to 70% by mass with respect to 100% by mass of the solid content of the low refractive index layer. More preferably, it is more preferably 45 to 65% by mass.
- a curing agent in the low refractive index layer according to the present invention, can be further contained in the same manner as the high refractive index layer.
- a curing agent can be further contained in the same manner as the high refractive index layer.
- boric acid and its salts and / or borax are preferred as the curing agent when polyvinyl alcohol is used as the second water-soluble binder resin applied to the low refractive index layer.
- boric acid and its salts known ones can be used.
- the content of the curing agent in the low refractive index layer is preferably 1 to 10% by mass and more preferably 2 to 6% by mass with respect to 100% by mass of the solid content of the low refractive index layer.
- the total amount of the curing agent used is preferably 1 to 600 mg per 1 g of polyvinyl alcohol, and more preferably 100 to 600 mg per 1 g of polyvinyl alcohol.
- the high refractive index layer and the low refractive index layer according to the present invention can contain various additives as necessary.
- the content of the additive in the high refractive index layer is preferably 0 to 20% by mass with respect to 100% by mass of the solid content of the high refractive index layer. Examples of such additives are described below.
- At least one of the high refractive index layer and the low refractive index layer may further contain a surfactant.
- a surfactant any of zwitterionic, cationic, anionic, and nonionic types can be used. More preferably, a betaine zwitterionic surfactant, a quaternary ammonium salt cationic surfactant, a dialkylsulfosuccinate anionic surfactant, an acetylene glycol nonionic surfactant, or a fluorine cationic interface Activators are preferred.
- the addition amount of the surfactant according to the present invention is in the range of 0.005 to 0.30 mass% when the total mass of the coating solution for high refractive index layer or the coating liquid for low refractive index layer is 100 mass%.
- the content is 0.01 to 0.10% by mass.
- the high refractive index layer or the low refractive index layer according to the present invention may contain an amino acid having an isoelectric point of 6.5 or less. By including an amino acid, the dispersibility of the first or second metal oxide particles in the high refractive index layer or the low refractive index layer can be improved.
- the amino acid is a compound having an amino group and a carboxyl group in the same molecule, and may be any type of amino acid such as ⁇ -, ⁇ -, and ⁇ -.
- Some amino acids have optical isomers, but in the present invention, there is no difference in effect due to optical isomers, and any isomer can be used alone or in racemic form.
- preferred amino acids include aspartic acid, glutamic acid, glycine, serine, and the like, with glycine and serine being particularly preferred.
- the isoelectric point of an amino acid refers to this pH value because an amino acid balances the positive and negative charges in the molecule at a specific pH and the overall charge is zero.
- the isoelectric point of each amino acid can be determined by isoelectric focusing at a low ionic strength.
- the high refractive index layer or low refractive index layer according to the present invention may further contain an emulsion resin.
- the emulsion resin By including the emulsion resin, the flexibility of the film is increased and the workability such as sticking to glass is improved.
- the emulsion resin is a resin in which fine resin particles having an average particle diameter of about 0.01 to 2.0 ⁇ m, for example, are dispersed in an emulsion state in an aqueous medium.
- the oil-soluble monomer has a hydroxy group. It can be obtained by emulsion polymerization using a polymer dispersant. There is no fundamental difference in the polymer component of the resulting emulsion resin depending on the type of dispersant used.
- dispersant used in the polymerization of the emulsion examples include polyoxyethylene nonylphenyl ether in addition to low molecular weight dispersants such as alkylsulfonate, alkylbenzenesulfonate, diethylamine, ethylenediamine, and quaternary ammonium salt.
- Polymer dispersing agents such as polyoxyethylene lauryl ether, hydroxyethyl cellulose, and polyvinylpyrrolidone.
- the polymer dispersant having a hydroxy group is a polymer dispersant having a weight average molecular weight of 10,000 or more, and having a hydroxy group substituted on the side chain or terminal.
- polyacrylic acid soda, polyacrylamide examples include 2-ethylhexyl acrylate copolymerized, and polyethers such as polyethylene glycol and polypropylene glycol.
- At least one of the high refractive index layer and the low refractive index layer may further contain a lithium compound.
- the coating liquid for the high refractive index layer or the coating liquid for the low refractive index layer containing the lithium compound becomes easier to control the viscosity, and as a result, the production stability when adding the optical film of the present invention to glass is further improved. .
- the lithium compound applicable to the present invention is not particularly limited.
- lithium lithium hypochlorite, lithium oxide, lithium carbide, lithium nitride, lithium niobate, lithium sulfide, lithium borate, LiBF 4 , LiClO 4 , LiPF 4 , LiCF 3 SO 3 and the like.
- lithium hydroxide is preferable from the viewpoint that the effects of the present invention can be sufficiently exhibited.
- the addition amount of the lithium compound is preferably in the range of 0.005 to 0.05 g per 1 g of the first or second metal oxide particles present in the high refractive index layer or the low refractive index layer, and more preferably 0.005. 01 to 0.03 g.
- nonionic surfactants JP-A-59-42993, JP-A-59-52689, JP-A-62-280069, JP-A-61-242871, and JP-A-4-219266.
- Optical brighteners sulfuric acid, phosphoric acid, acetic acid, citric acid, sodium hydroxide, potassium hydroxide, potassium carbonate, etc.
- Lubricants such as tylene glycol, antiseptics, antifungal agents, antistatic agents, matting agents, heat stabilizers, antioxidants, flame retardants, crystal nucleating agents, inorganic particles, organic particles, thickeners, lubricants, infrared absorption Examples include various known additives such as agents, dyes, and pigments.
- the method for forming the infrared reflective layer according to the present invention is not particularly limited, but a high-concentration containing the first water-soluble binder resin and the first metal oxide particles on the transparent resin film.
- a production method including a step of applying a refractive index layer coating solution and a low refractive index layer coating solution containing a second water-soluble binder resin and second metal oxide particles is preferable.
- the coating method is not particularly limited, and for example, roller coating method, rod bar coating method, air knife coating method, spray coating method, slide curtain coating method, or U.S. Pat. No. 2,761,419, U.S. Pat. Examples thereof include a slide hopper coating method and an extrusion coating method described in Japanese Patent No. 2,761,791.
- a method of applying a plurality of layers in multiple layers sequential multilayer application or simultaneous multilayer application may be used.
- the solvent for preparing the coating solution for the high refractive index layer and the coating solution for the low refractive index layer is not particularly limited, but water, an organic solvent or a mixed solvent thereof is preferable.
- organic solvent examples include alcohols such as methanol, ethanol, 2-propanol and 1-butanol, esters such as ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate and propylene glycol monoethyl ether acetate, diethyl ether and propylene.
- examples include ethers such as glycol monomethyl ether and ethylene glycol monoethyl ether, amides such as dimethylformamide and N-methylpyrrolidone, and ketones such as acetone, methyl ethyl ketone, acetylacetone and cyclohexanone. These organic solvents may be used alone or in combination of two or more.
- the solvent of the coating solution is particularly preferably water or a mixed solvent of water and methanol, ethanol, or ethyl acetate.
- the concentration of the first water-soluble binder resin in the coating solution for the high refractive index layer is preferably in the range of 1 to 10% by mass.
- the concentration of the first metal oxide particles in the coating solution for the high refractive index layer is preferably in the range of 1 to 50% by mass.
- the concentration of the second water-soluble binder resin in the coating solution for the low refractive index layer is preferably in the range of 1 to 10% by mass.
- the concentration of the second metal oxide particles in the coating solution for the low refractive index layer is preferably in the range of 1 to 50% by mass.
- the thermal shrinkage rate of the optical film can be changed by changing the concentration of each of these materials, and the value obtained by dividing the thermal shrinkage rate of the optical film by the thermal shrinkage rate of the transparent resin film is 1 to 3 can be adjusted.
- the preparation method of the coating liquid for the high refractive index layer and the coating liquid for the low refractive index layer is not particularly limited.
- the water-soluble binder resin, the metal oxide particles, and the necessity There may be mentioned a method in which other additives added in accordance with the above are added and mixed by stirring.
- the order of addition of the water-soluble binder resin, metal oxide particles, and other additives used as necessary is not particularly limited, and each component may be added and mixed sequentially while stirring, or stirring. However, it may be added at once and mixed. If necessary, it is further adjusted to an appropriate viscosity using a solvent.
- a high refractive index layer using an aqueous high refractive index coating solution prepared by adding and dispersing core / shell particles.
- the core / shell particles are prepared by adding to the high refractive index layer coating solution as a sol having a pH in the range of 5.0 to 7.5 and a negative zeta potential of the particles. Is preferred.
- the viscosity at 40 to 45 ° C. of the coating liquid for the high refractive index layer and the coating liquid for the low refractive index layer when the simultaneous multilayer coating is performed by the slide hopper coating method is 5 to 300 mPa ⁇ s. Is preferable, and the range of 10 to 250 mPa ⁇ s is more preferable.
- the viscosity at 40 to 45 ° C. of the coating solution for the high refractive index layer and the coating solution for the low refractive index layer when performing simultaneous multilayer coating by the slide curtain coating method is preferably within the range of 5 to 1200 mPa ⁇ s. A range of 25 to 500 mPa ⁇ s is more preferable.
- the viscosity at 15 ° C. of the coating solution for the high refractive index layer and the coating solution for the low refractive index layer is preferably 10 mPa ⁇ s or more, more preferably in the range of 15 to 30000 mPa ⁇ s, and in the range of 20 to 20000 mPa ⁇ s. Is more preferable, and the range of 20 to 18000 mPa ⁇ s is particularly preferable.
- the coating and drying method is not particularly limited, but the coating solution for the high refractive index layer and the coating solution for the low refractive index layer are heated to 30 ° C. or higher to form a transparent resin film.
- the temperature of the formed coating film is preferably cooled (set) preferably to 1 to 15 ° C., and then at 10 ° C. or higher. It is preferable to dry. More preferable drying conditions are a wet bulb temperature of 5 to 50 ° C. and a film surface temperature of 10 to 50 ° C.
- the set means a step of increasing the viscosity of the coating composition and reducing the fluidity of substances in each layer and in each layer by means such as applying cold air to the coating to lower the temperature.
- a state in which the cold air is applied to the coating film from the surface and the finger is pressed against the surface of the coating film is defined as a set completion state.
- the time (setting time) from application of cold air to completion of setting is preferably within 5 minutes, preferably within 2 minutes. Further, the lower limit time is not particularly limited, but it is preferable to take 45 seconds or more. If the set time is too short, mixing of the components in the layer may be insufficient. On the other hand, if the set time is too long, the interlayer diffusion of the metal oxide particles proceeds, and the refractive index difference between the high refractive index layer and the low refractive index layer may be insufficient. In addition, if the high elasticity of the optical film unit between the high refractive index layer and the low refractive index layer occurs quickly, the step of setting may not be provided.
- the set time is adjusted by adjusting the concentration of the water-soluble binder resin and the metal oxide particles, and adding other components such as various known gelling agents such as gelatin, pectin, agar, carrageenan and gellan gum. Can be adjusted.
- the temperature of the cold air is preferably 0 to 25 ° C, more preferably 5 to 10 ° C. Further, the time during which the coating film is exposed to the cold air is preferably 10 to 120 seconds, although it depends on the transport speed of the coating film.
- a conductive layer, an antistatic layer, a gas barrier layer, an easy adhesion layer (adhesive layer), an antifouling layer, a deodorizing layer for the purpose of adding further functions on the transparent resin film, Flowing layer, slippery layer, hard coat layer, abrasion resistant layer, antireflection layer, electromagnetic wave shielding layer, ultraviolet absorbing layer, infrared absorbing layer, printed layer, fluorescent light emitting layer, hologram layer, release layer, adhesive layer, It may have functional layers such as an adhesive layer, an infrared cut layer (metal layer, liquid crystal layer) and a colored layer (visible light absorbing layer) other than the high refractive index layer and the low refractive index layer of the present invention.
- an infrared absorption layer, a heat insulating layer, and a hard coat layer which are preferable functional layers will be described.
- the optical film according to the present invention may further include an infrared absorbing layer.
- the infrared absorption layer is laminated at an arbitrary position, but in order to obtain the heat shielding effect of the laminated glass of the present invention more efficiently, the infrared absorption layer is laminated below the infrared reflection layer when viewed from the incident light side. It is more preferable that the transparent resin film is laminated on the surface opposite to the surface on which the infrared reflective layer is laminated. Moreover, even if it contains an infrared absorber in another layer, for example, a hard coat layer, it functions as an infrared absorption layer.
- the thickness of each infrared absorption layer is preferably within a range of 0.1 to 50 ⁇ m, and more preferably within a range of 1 to 20 ⁇ m. If it is 0.1 ⁇ m or more, the infrared absorption ability tends to be improved. On the other hand, if it is 50 ⁇ m or less, the crack resistance of the coating film is improved.
- the material contained in the infrared absorption layer is not particularly limited, and examples thereof include an ultraviolet curable resin, a photopolymerization initiator, and an infrared absorber.
- UV curable resins are superior in hardness and smoothness to other resins, and are also advantageous from the viewpoint of dispersibility of ITO, antimony-doped tin oxide (ATO) and heat conductive metal oxides.
- the ultraviolet curable resin can be used without particular limitation as long as it forms a transparent layer by curing, and examples thereof include silicone resins, epoxy resins, vinyl ester resins, acrylic resins, and allyl ester resins. More preferred is an acrylic resin from the viewpoint of hardness, smoothness and transparency.
- the acrylic resin is a reactive silica particle in which a photosensitive group having photopolymerization reactivity is introduced on its surface as described in International Publication No. 2008/035669 from the viewpoint of hardness, smoothness, and transparency.
- a photopolymerizable photosensitive group include polymerizable unsaturated groups represented by a (meth) acryloyloxy group.
- the ultraviolet curable resin contains a photopolymerizable photosensitive group introduced on the surface of the reactive silica particles and a compound capable of photopolymerization, for example, an organic compound having a polymerizable unsaturated group. There may be.
- the polymerizable unsaturated group-modified hydrolyzable silane is chemically bonded to the silica particles by generating a silyloxy group by a hydrolysis reaction of the hydrolyzable silyl group. It can be used as reactive silica particles.
- the average particle diameter of the reactive silica particles is preferably 0.001 to 0.1 ⁇ m. By setting the average particle diameter in such a range, transparency, smoothness, and hardness can be satisfied with a good balance.
- the acrylic resin may contain a structural unit derived from a fluorine-containing vinyl monomer from the viewpoint of adjusting the refractive index.
- fluorine-containing vinyl monomer examples include fluoroolefins (for example, fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, etc.), partial (meth) acrylic acid or fully fluorinated alkyl ester derivatives (for example, biscoat 6FM). (Trade name, manufactured by Osaka Organic Chemical Co., Ltd.) and R-2020 (trade name, manufactured by Daikin Industries, Ltd.), and the like, and fully or partially fluorinated vinyl ethers.
- fluorine-containing vinyl monomer examples include fluoroolefins (for example, fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, etc.), partial (meth) acrylic acid or fully fluorinated alkyl ester
- photopolymerization initiator known ones can be used, and they can be used alone or in combination of two or more.
- Inorganic infrared absorbers contained in the infrared absorption layer include tin-doped indium oxide (ITO) and antimony-doped tin oxide (ATO) from the viewpoints of visible light transmittance, infrared absorptivity, suitability for dispersion in resins, and the like. ), Zinc antimonate, lanthanum hexaboride (LaB 6 ), cesium-containing tungsten oxide (Cs 0.33 WO 3 ) and the like are preferable. These may be used alone or in combination of two or more.
- the average particle size of the inorganic infrared absorber is preferably 5 to 100 nm, more preferably 10 to 50 nm.
- the average particle size is measured by taking an image with a transmission electron microscope, randomly extracting, for example, 50 particles, measuring the particle size, and averaging the results. Moreover, when the shape of particle
- the content of the inorganic infrared absorber in the infrared absorption layer is preferably 1 to 80% by mass, and more preferably 1 to 50% by mass with respect to the total mass of the infrared absorption layer. If the content is 1% by mass or more, a sufficient infrared absorption effect appears, and if it is 80% by mass or less, a sufficient amount of visible light can be transmitted.
- the infrared absorption layer may contain other infrared absorbers such as metal oxides other than those described above, organic infrared absorbers, metal complexes, and the like within the scope of the effects of the present invention.
- specific examples of such other infrared absorbers include, for example, diimonium compounds, aluminum compounds, phthalocyanine compounds, organometallic complexes, cyanine compounds, azo compounds, polymethine compounds, quinone compounds, diphenylmethane compounds. Compounds, triphenylmethane compounds, and the like.
- the method for forming the infrared absorbing layer is not particularly limited.
- the infrared absorbing layer coating liquid containing the above components is prepared, and then the coating liquid is applied using a wire bar and dried. And the like.
- Heat insulation layer in this invention, it can have a heat insulation layer (henceforth only a heat insulation layer) which has a space
- a heat insulation layer By having a heat insulating layer, the risk of so-called thermal cracking can be reduced. Furthermore, the heat shielding effect of the laminated glass of the present invention can be further improved.
- the heat insulating layer according to the present invention preferably has a thermal conductivity of 0.001 to 0.2 W / (m ⁇ K), more preferably 0.005 to 0.15 W / (m ⁇ K). Within range.
- the thermal conductivity is 0.001 W / (m ⁇ K) or more, slight heat transfer and thermal diffusion occur, and damage such as swelling, peeling, and discoloration of the film is unlikely to occur.
- it is 0.2 W / (m * K) or less, a heat transfer and thermal diffusion can be suppressed, the heat conduction to glass can be suppressed effectively, and a glass thermal crack becomes difficult to occur.
- the thermal conductivity can be measured using, for example, a hot wire probe type thermal conductivity measuring device (QTM-500, manufactured by Kyoto Electronics Industry Co., Ltd.).
- the porosity of the heat insulating layer according to the present invention is preferably in the range of 30 to 95%, more preferably in the range of 60 to 95%. If the porosity is 30% or more, the heat insulating performance is exhibited and glass thermal cracking hardly occurs. Moreover, if the porosity is 95% or less, the layer structure strength can be maintained to such an extent that the structure does not collapse even during handling.
- the material for forming the heat insulating layer is not particularly limited, and examples thereof include a combination of inorganic oxide particles and a polymer binder, or a foamed resin.
- a known material can be used as the inorganic oxide particles. Specifically, for example, silica (SiO 2 ), alumina (Al 2 O 3 ), zirconium oxide (ZrO 2 ), zeolite, titanium oxide (TiO 2 ), barium titanate (BaTiO 3 ), strontium titanate (SrTiO 3 ).
- CaTiO 3 calcium titanate
- aluminum borate iron oxide, calcium carbonate, barium carbonate, lead oxide, tin oxide, cerium oxide, calcium oxide, trimanganese tetroxide, magnesium oxide, niobium oxide, tantalum oxide, Tungsten oxide, antimony oxide, aluminum phosphate, calcium silicate, zirconium silicate, ITO, titanium silicate, mesoporous silica (FSM-16, MCM41, etc.), montmorillonite, saponite, vermiculite, hydrotalcite, potassium Examples include orinite, kanemite, isralite, magadiite, and kenyaite. These may be used alone or in combination of two or more.
- these composite oxides can also be preferably used.
- neutral to acidic inorganic oxide particles are preferable from the viewpoint of the strength of the heat insulating layer.
- zirconium oxide, montmorillonite, saponite, vermiculite, hydrotalcite, kaolinite, kanemite, tin oxide, tungsten oxide, titanium oxide, aluminum phosphate, silica, zinc oxide, or alumina are preferable, and more preferable.
- silica particles or alumina particles This is because silica particles and alumina particles are industrially inexpensive and easily available, and since the surface has a reactive hydroxy group, it is relatively easy to modify the surface with a crosslinkable functional group. .
- the inorganic oxide particles may be porous particles.
- the porous inorganic oxide particles are inorganic oxide particles having innumerable fine holes in the particle surface or inside, and the specific surface area is preferably 500 to 1000 m 2 / g. If the specific surface area is 500 m 2 / g or more, the porosity can be increased, and the heat insulation tends to be improved. Moreover, if it is 1000 m ⁇ 2 > / g or less, it exists in the tendency for the film
- inorganic oxide machine particles having porosity for example, as described in JP-A-7-133105, the surface of porous inorganic oxide particles is coated with silica or the like, and the low refractive index Nanometer-sized composite oxide fine particles, and, as described in JP-A-2001-233611, a low-refractive-index nanometer size comprising silica and an inorganic oxide other than silica and having a cavity inside Also suitable are silica-based fine particles.
- the average particle diameter of the inorganic oxide particles is preferably in the range of 1 to 200 nm. If the average particle size is 1 nm or more, the porosity tends to increase and the heat insulating property tends to be improved, and if the average particle size is 200 nm or less, the film strength of the heat insulating layer tends to improve.
- the inorganic oxide particles contained in the heat insulating layer may be hollow particles from the viewpoint of easily controlling the pore diameter of the voids and the thickness of the outer casing of the heat insulating layer structure.
- the template surface is coated with an inorganic oxide using a sol-gel solution such as a metal alkoxide or a silane coupling agent in which a template of inorganic nanoparticles having a predetermined particle size is dispersed, or a reactive resin monomer solution. After that, it can be obtained by a method of dissolving the template inside and making it hollow.
- the hollow particles are not limited to those in which the outer casing is entirely closed, but may have a structure in which a part is opened.
- silica As materials used for the outer casing, silica, metal oxides, organic resin materials, etc. can be used without limitation, but in order to ensure the mechanical strength of the heat insulating layer, silica or organic modified silica is formed. It is preferable to use a silane coupling agent.
- the average pore diameter of the hollow particles is preferably 80 nm or less, and more preferably 50 nm or less in order to ensure heat insulation and transparency.
- the average thickness of the outer casing is preferably in the range of 1 to 7 nm, and more preferably in the range of 1 to 5 nm. If the thickness of the outer sheath is 7 nm or less, the transparency of the heat insulating layer tends to be improved, and if it is 1 nm or more, the mechanical strength of the heat insulating layer tends to be increased.
- the average particle diameter of these inorganic oxide particles is the volume average value of the diameter (sphere converted particle diameter) when each particle is converted to a sphere having the same volume, and this value can be determined by observation with an electron microscope. That is, from observation of the inorganic oxide particles with an electron microscope, 200 or more inorganic oxide fine particles in a certain visual field were measured, the spherical equivalent particle diameter of each particle was obtained, and the average value was obtained. is there.
- inorganic oxide particles whose surface is modified with a silane coupling agent or the like can also be used.
- the surface modifying group is not particularly limited, but a crosslinkable functional group capable of crosslinking with a nitrogen-containing aromatic polymer having a crosslinkable functional group at the terminal is preferably used.
- the crosslinkable functional group may be a group having a carbon-carbon unsaturated bond such as vinyl group, acrylic group, methacryl group or allyl group, cyclic ether group such as epoxy group or oxetane group, isocyanate group, hydroxy group, carboxyl group. Groups and the like.
- a method of providing a crosslinkable functional group on the surface of the inorganic oxide particle a method of reacting the silane compound having the crosslinkable functional group with the surface of the inorganic oxide particle is preferably used.
- the silane compound having a crosslinkable functional group include 1 to 3 functional alkoxysilanes, chlorosilane compounds having a crosslinkable functional group, or disilazane compounds having a crosslinkable functional group.
- the content of the inorganic oxide particles in the heat insulating layer is not particularly limited, but is preferably 10 to 95% by mass, and more preferably 50 to 90% by mass with respect to the total mass of the heat insulating layer. When it is 10% by mass or more, the porosity tends to increase and the heat insulation tends to be improved, and when it is 95% by mass or less, the mechanical strength of the heat insulation layer tends to improve.
- the heat insulating layer contains inorganic oxide particles, it is preferable to contain a small amount of a polymer binder from the viewpoint of coating film flexibility and void formation.
- polymer binder examples include thermoplastic resins and polymers having rubber elasticity. Specifically, for example, starch, carboxymethyl cellulose, cellulose, diacetyl cellulose, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, sodium alginate, poly Water-soluble resins such as acrylic acid, sodium polyacrylate, polyvinylphenol, polyvinyl methyl ether, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylonitrile, polyacrylamide, polyhydroxy (meth) acrylate, styrene-maleic acid copolymer, polyvinyl chloride , Polytetrafluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride Ride-tetrafluoroethylene-hexafluoropropylene copolymer, polyethylene, polypropylene, ethylene-propylene-diene ter
- the content of these polymer binders is not particularly limited, but is preferably in the range of 5 to 90% by mass, more preferably in the range of 10 to 50% by mass with respect to the total mass of the heat insulating layer. If it is 5 mass% or more, it exists in the tendency for the softness
- foamed resin used as the material for the heat insulating layer examples include foams such as polyolefins such as polyurethane, polystyrene, polyethylene, and polypropylene, phenol resins, polyvinyl chloride, urea resins, polyimides, and melamine resins. These may be used alone or in combination of two or more. Among these, foamed polystyrene or foamed polyurethane is preferable from the viewpoint of moldability.
- the heat insulating layer may use a crosslinking agent from the viewpoint of further increasing the film strength.
- the crosslinking agent is roughly classified into an inorganic type and an organic type. In the present invention, either of them can provide a sufficient effect.
- These crosslinking agents can be used alone or in combination of two or more.
- the inorganic crosslinking agent used include, for example, an acid having a boron atom (boric acid, orthoboric acid, 2 boric acid, metaboric acid, 4 boric acid, 5 boric acid, etc.) or a salt thereof, a zinc salt ( Zinc sulfate, etc.), copper salts (copper sulfate, etc.), zirconium salts, etc. (zirconium nitrate, zirconyl acetate, etc.), aluminum salts (aluminum sulfate salts, etc.), titanium salts (titanium lactate salts, etc.), and the like.
- preferred inorganic crosslinking agents are acids having a boron atom or salts thereof, aluminum salts, and zirconium salts, and more preferred are zirconium salts.
- organic crosslinking agent examples include aldehyde crosslinking agents (formalin, glyoxal, dialdehyde starch, polyacrolein, N-methylolurea, N-methylolmelamine, N-hydroxylmethylphthalimide, etc.), active vinyl-based compounds, and the like.
- Crosslinking agents bisvinylsulfonylmethylmethane, tetrakisvinylsulfonylmethylmethane, N, N, N-trisacryloyl-1,3,5-hexahydrotriazine, etc.
- epoxy crosslinking agents polyisocyanate crosslinking agents, etc. It is done.
- polyisocyanate crosslinking agents, epoxy crosslinking agents, and aldehyde crosslinking agents are preferred, and polyisocyanate crosslinking agents and epoxy curing agents that exhibit a good reaction with hydroxy groups are more preferred.
- An epoxy-based cross-linking agent is a compound having at least two glycidyl groups in the molecule.
- many cross-linking agents are commercially available from Nagase Chemtech Co., Ltd. under the trade name of Denacol (registered trademark).
- the polyisocyanate-based crosslinking agent is a compound having at least two isocyanate groups in the molecule and has high reactivity with a hydroxy group or the like.
- main isocyanate crosslinking agents include toluylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and modified products and prepolymers thereof, polyfunctional aromatic isocyanates, aromatic polyisocyanates, and polyfunctional aliphatic isocyanates. , Block polyisocyanate, polyisocyanate prepolymer, and the like. The details of these polyiasocyanate-based crosslinking agents are described in, for example, the crosslinking agent handbook (published by Taiseisha, published in October 1981).
- the inorganic crosslinking agent and the organic crosslinking agent it is preferably used in the range of about 1 to 50% by mass with respect to the polymer binder, more preferably 2 from the viewpoint of film strength and flexibility of the heat insulating layer. It is used in the range of ⁇ 40% by mass.
- the method for supplying these crosslinking agents to the heat insulating layer is not particularly limited.
- the crosslinking agent may be added to the coating solution for forming the heat insulating layer, or after the heat insulating layer is provided, the crosslinking agent is overcoated. May be supplied.
- the overcoating may be performed at the same time as or after the coating of the heat insulating layer forming coating solution.
- the coating method of the crosslinking agent may be coating by a coater or the like, spray coating or dipping in a crosslinking agent solution.
- the method for forming the heat insulating layer of the present invention is not particularly limited, but when the heat insulating layer includes inorganic oxide particles and a polymer binder, a wet coating method is preferable. Specifically, it can be formed by mixing inorganic oxide particles, a polymer binder, and, if necessary, a crosslinking agent with a solvent to prepare a coating solution, and then coating and drying on a substrate.
- the solvent may be any solvent that can uniformly disperse the inorganic oxide particles, the polymer binder, and the crosslinking agent. Specifically, one or more of water, methanol, ethanol, 2-propanol, N-methylpyrrolidone, dimethylformamide, dimethylacetamide, N-dimethylformamide and the like can be used. At this time, various additives may be added to stabilize the coating solution (dispersion). Even if these additives are materials that can be removed by heating, there is no particular limitation as long as the materials do not crush the voids of the void heat insulating layer of the present invention.
- the method is not particularly limited as long as it can be applied to a desired thickness substantially uniformly.
- a screen printing method, a bar coating method, a roll coating method, a reverse coating method, a gravure printing method, a doctor blade method, a die coating method, and the like can be given.
- the coating method can be properly used as necessary, such as continuous coating, intermittent coating, and stripe coating.
- the drying method after coating is not particularly limited as long as the solvent contained in the coating solution can be removed. Hot air drying, infrared drying, far infrared drying, microwave drying, electron beam drying, vacuum drying, supercritical drying. Various methods such as these can be selected and used as appropriate.
- the drying temperature is not particularly limited, but is preferably 50 to 400 ° C, more preferably 70 to 150 ° C.
- the formation method of the heat insulating layer when the heat insulating layer contains a foamed resin is not particularly limited, and examples thereof include chemical foaming and physical foaming.
- foamed resin examples thereof include chemical foaming and physical foaming.
- polystyrene and an inert gas in a supercritical state such as carbon dioxide as a blowing agent are injected into a supercritical extruder, and a polystyrene sheet having high density of fine bubbles is infrared.
- a method of extruding on the reflective layer to form a heat insulating layer can be employed.
- the thickness of the heat insulating layer formed by the above method is not particularly limited, but is preferably 100 nm to 200 ⁇ m, and more preferably 100 nm to 20 ⁇ m. If it is this range, it will hardly influence the transparency of a film, and also heat insulation can be expressed.
- the heat insulating layer may be provided on at least one side of the transparent resin film, but it is preferable to provide it at a position closer to glass in consideration of the mechanism of thermal cracking. Specifically, an arrangement located between the transparent resin film and the glass is preferable, and an arrangement located between the infrared reflection layer and the glass is more preferable. Moreover, if it is an optical film provided with an infrared absorption layer, arrangement
- the porosity of a heat insulation layer can be controlled by adjusting content in each heat insulation layer, when a heat insulation layer contains an inorganic oxide particle and a polymer binder.
- the porosity of the heat insulation layer can be controlled by controlling the foaming conditions of the resin.
- Hard coat layer In the optical film according to the present invention, a hard coat layer containing an infrared absorbing pigment or the like is preferably laminated as a surface protective layer for enhancing the scratch resistance.
- the hard coat layer according to the present invention may be laminated on both sides of the transparent resin film according to the present invention, or may be laminated on one side. Depending on the transparent resin film, adhesion to the adhesive layer may be poor, or when an infrared reflective layer is formed, white turbidity may occur. By forming the hard coat layer, these problems can be solved. Moreover, it is also possible to control the elongation of the transparent resin film by forming a hard coat layer.
- curable resin used in the hard coat layer examples include a thermosetting resin and an ultraviolet curable resin.
- an ultraviolet curable resin is preferable because it is easy to mold, and among them, those having a pencil hardness of at least 2H. More preferred.
- curable resins can be used singly or in combination of two or more.
- an ultraviolet curable resin for example, it is synthesized from a polyfunctional acrylate resin such as acrylic acid or methacrylic acid ester having a polyhydric alcohol, and acrylic acid or methacrylic acid having a diisocyanate and a polyhydric alcohol.
- a polyfunctional acrylate resin such as acrylic acid or methacrylic acid ester having a polyhydric alcohol, and acrylic acid or methacrylic acid having a diisocyanate and a polyhydric alcohol.
- polyfunctional urethane acrylate resins can be mentioned.
- polyether resins having an acrylate functional group polyester resins, epoxy resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, and the like can also be suitably used.
- benzoins such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzyl methyl ketal and the like Alkyl ethers; acetophenones such as acetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone; anthraquinones such as methylanthraquinone, 2-ethylanthraquinone, 2-amylanthraquinone; thioxanthone, 2,4 -Thioxanthones such as diethylthioxanthone and 2,4-diisopropylthioxanthone; Ketals such as acetophenone dimethyl ketal and benzyldimethyl ketal; Benzophenone and 4,4-b
- tertiary amines such as triethanolamine and methyldiethanolamine
- photoinitiators such as 2-dimethylaminoethylbenzoic acid and benzoic acid derivatives such as ethyl 4-dimethylaminobenzoate
- radical polymerization initiators are used in an amount of 0.5 to 20 parts by weight, preferably 1 to 15 parts by weight, based on 100 parts by weight of the polymerizable component of the resin.
- a well-known general paint additive with the above-mentioned cured resin as needed.
- a silicone-based or fluorine-based paint additive that imparts leveling or surface slip properties is effective in preventing scratches on the surface of a cured film, and in the case of using ultraviolet rays as active energy rays, When the additive bleeds to the air interface, the inhibition of curing of the resin by oxygen can be reduced, and an effective degree of curing can be obtained even under low irradiation intensity conditions.
- the hard coat layer preferably contains inorganic fine particles.
- Preferable inorganic fine particles include fine particles of an inorganic compound containing a metal such as titanium, silica, zirconium, aluminum, magnesium, antimony, zinc, or tin.
- the average particle size of the inorganic fine particles is preferably 1000 nm or less, and more preferably in the range of 10 to 500 nm, from the viewpoint of ensuring visible light transmittance.
- the inorganic fine particles have higher photopolymerization reactivity such as monofunctional or polyfunctional acrylates because the higher the bond strength with the cured resin that forms the hard coat layer, the more the falling off from the hard coat layer can be suppressed. Those having a group introduced on the surface are preferred.
- the thickness of the hard coat layer is preferably in the range of 0.1 to 50 ⁇ m, and more preferably in the range of 1 to 20 ⁇ m. If it is 0.1 ⁇ m or more, the hard coat property tends to be improved. Conversely, if it is 50 ⁇ m or less, the transparency of the infrared shielding film tends to be improved.
- the hard coat layer may also serve as the above-described infrared absorption layer.
- the method for forming the hard coat layer is not particularly limited. For example, after preparing a coating liquid for hard coat layer containing the above components, the coating liquid is applied with a wire bar and the coating liquid is cured with heat and / or UV. And a method of forming a hard coat layer.
- Adhesive layer> In the laminated glass according to the present invention, adhesive layers are provided on both surfaces of the optical film, whereby the glass substrate is bonded.
- the adhesive layer is preferably composed of an adhesive, and the adhesive is particularly limited.
- the adhesive examples thereof include acrylic adhesives, silicone adhesives, urethane adhesives, polyvinyl butyral adhesives, ethylene-vinyl acetate adhesives, and the like.
- the acrylic pressure-sensitive adhesive to be used may be either solvent-based or emulsion-based, but a solvent-based pressure-sensitive adhesive is preferable because it is easy to increase adhesive strength and the like, and among them, those obtained by solution polymerization are preferable.
- the raw material for producing such a solvent-based acrylic pressure-sensitive adhesive by solution polymerization include, for example, acrylic acid esters such as ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and acryl acrylate as main monomers serving as a skeleton, As a comonomer for improving the cohesive force, vinyl acetate, acrylonitrile, styrene, methyl methacrylate, etc., to further promote crosslinking, to give a stable adhesive force, and to maintain a certain adhesive force even in the presence of water
- the functional group-containing monomer include methacrylic acid, acrylic acid, itaconic acid, hydroxyethyl methacrylate, and g
- This adhesive layer contains additives such as stabilizers, surfactants, UV absorbers, flame retardants, antistatic agents, antioxidants, thermal stabilizers, lubricants, fillers, coloring, adhesion modifiers, etc. It can also be made.
- additives such as stabilizers, surfactants, UV absorbers, flame retardants, antistatic agents, antioxidants, thermal stabilizers, lubricants, fillers, coloring, adhesion modifiers, etc.
- an ultraviolet absorber is also effective for suppressing deterioration of the infrared shielding film due to ultraviolet rays.
- the thickness of the adhesive layer is preferably 1 ⁇ m to 100 ⁇ m, more preferably 3 to 50 ⁇ m. If it is 1 micrometer or more, there exists a tendency for adhesiveness to improve and sufficient adhesive force is acquired. On the other hand, if the thickness is 100 ⁇ m or less, not only the transparency of the infrared shielding film is improved, but also it is possible to prevent the occurrence of cohesive failure between the adhesive layers when the infrared shielding film is attached to a glass substrate and then peeled off. it can.
- the method for forming the adhesive layer on the optical film is not particularly limited. For example, after preparing a pressure-sensitive adhesive coating solution containing the pressure-sensitive adhesive, the adhesive layer is coated on the optical film using a wire bar and dried. An optical film with an adhesive layer can be produced.
- the glass substrate applied to the laminated glass of this invention is demonstrated.
- Commercially available glass can be used as the glass substrate according to the present invention.
- the kind of glass is not specifically limited, Usually, soda-lime silica glass is used suitably. In this case, it may be a colorless transparent glass or a colored transparent glass.
- the outdoor glass substrate close to the incident light is preferably colorless transparent glass.
- the glass substrate on the indoor side far from the incident light side is preferably a green colored transparent glass, a dark transparent glass, or a colorless transparent glass.
- the green colored transparent glass preferably has ultraviolet absorption performance and infrared absorption performance.
- the green colored transparent glass is not particularly limited, for example, soda lime silica glass containing iron is preferable.
- a soda lime silica glass containing 0.3 to 1 mass% of total iron in terms of Fe 2 O 3 in a soda lime silica base glass is preferable.
- the mass of FeO (divalent iron) is all in terms of Fe 2 O 3. It is preferably 20 to 40% by mass of iron.
- soda lime silica glass having the following composition substantially. SiO 2 : 65 to 75% by mass, Al 2 O 3 : 0.1 to 5% by mass, Na 2 O + K 2 O: 10 to 18% by mass, CaO: 5 to 15% by mass, MgO: 1 to 6% by mass, terms of Fe 2 O 3 were total iron 0.3 to 1 mass%, the total cerium CeO 2 in terms and / or TiO 2: 0.5 ⁇ 2% by weight.
- the dark transparent glass is not particularly limited, but, for example, soda lime silica glass containing iron at a high concentration is preferable.
- both the indoor side glass substrate and the outdoor side glass substrate have a thickness of 1.5 to 3.0 mm.
- the indoor side glass substrate and the outdoor side glass substrate can have the same thickness or different thicknesses.
- both the indoor side glass substrate and the outdoor side glass substrate may be 2.0 mm thick or 2.1 mm thick.
- the thickness of the indoor glass substrate is less than 2 mm and the thickness of the outdoor glass substrate is slightly over 2 mm, thereby reducing the total thickness of the laminated glass, And it can resist external force from the outside of the vehicle.
- the indoor side glass substrate and the outdoor side glass substrate may be flat or curved. Since vehicles, particularly automobile windows, are often curved, the indoor glass substrate and the outdoor glass substrate are often curved. In this case, the optical film is provided on the concave surface side of the outdoor glass substrate. Further, three or more glass substrates can be used as necessary.
- Preparation of laminated glass 1 (Preparation of coating liquid L1 for low refractive index layer) First, 680 parts of a colloidal silica (manufactured by Nissan Chemical Industries, Ltd., Snowtex (registered trademark) OXS) aqueous solution as 10% by mass of second metal oxide particles, and 4.0% by mass of polyvinyl alcohol (Kuraray Co., Ltd.). (Manufactured by PVA-103: polymerization degree 300, saponification degree 98.5 mol%) 30 parts of an aqueous solution and 150 parts of a 3.0% by weight boric acid aqueous solution were mixed and dispersed. Pure water was added to prepare 1000 parts of colloidal silica dispersion L1 as a whole.
- a colloidal silica manufactured by Nissan Chemical Industries, Ltd., Snowtex (registered trademark) OXS
- PVA-103 polymerization degree 300, saponification degree 98.5 mol
- PVA-103 polymerization degree 300, saponification degree 98.5 mol
- the obtained colloidal silica dispersion L1 was heated to 45 ° C., and 4.0% by mass of polyvinyl alcohol as a second water-soluble binder resin (manufactured by Nippon Vitamin Poval Co., Ltd., JP-45 : Polymerization degree 4500, saponification degree 86.5 to 89.5 mol%) 760 parts of an aqueous solution were sequentially added with stirring. Thereafter, 40 parts of 1.0% by mass of a betaine surfactant (manufactured by Kawaken Fine Chemical Co., Ltd., sofazoline (trade name) LSB-R) aqueous solution was added to prepare a coating solution L1 for a low refractive index layer.
- a betaine surfactant manufactured by Kawaken Fine Chemical Co., Ltd., sofazoline (trade name) LSB-R
- aqueous suspension of titanium oxide was prepared such that the titanium oxide hydrate was suspended in water and the concentration when converted to TiO 2 was 100 g / L.
- concentration 10 mol / L
- an aqueous sodium hydroxide solution concentration: 10 mol / L
- the solution was neutralized with hydrochloric acid, filtered, and washed with water.
- the raw material titanium oxide hydrate is obtained by thermal hydrolysis treatment of an aqueous titanium sulfate solution according to a known method.
- the base-treated titanium compound was suspended in pure water so that the concentration when converted to TiO 2 was 20 g / L. Therein, the 0.4 mol% of citric acid was added with stirring to TiO 2 weight. Thereafter, the mixture was heated, and when the temperature of the mixed sol solution reached 95 ° C., concentrated hydrochloric acid was added so that the hydrochloric acid concentration became 30 g / L, and the mixture was stirred for 3 hours while maintaining the solution temperature at 95 ° C. A liquid was prepared.
- titanium oxide sol solution was dried at 105 ° C. for 3 hours to obtain titanium oxide powder fine particles.
- the powder fine particles were subjected to X-ray diffraction measurement using JDX-3530 type manufactured by JEOL Datum Co., Ltd. and confirmed to be rutile titanium oxide fine particles.
- the volume average particle diameter of the fine particles was 10 nm.
- a 20.0 mass% titanium oxide sol aqueous dispersion containing rutile-type titanium oxide fine particles having a volume average particle diameter of 10 nm was added to 4 kg of pure water to obtain a sol solution serving as core particles.
- the above prepared low refractive index layer coating liquid L1 and high refractive index layer coating liquid H1 are kept at 45 ° C. and heated to 45 ° C. and have a thickness of 50 ⁇ m.
- the low refractive index layer and the low refractive index layer are dried so that the film thickness at the time of drying is 130 nm.
- a total of 11 simultaneous multilayer coatings of 6 refractive index layers and 5 high refractive index layers were alternately performed.
- the thermal contraction rate A of the transparent resin film was measured as follows. That is, after storing the transparent resin film at a temperature of 23 ° C. and a relative humidity of 55% RH for 24 hours, two marks are made at intervals of 100 mm in the width direction, and the distance L 1 between the two marks in an unloaded state. Is measured using a microscope or the like. Subsequently, the transparent resin film is hung in an oven at 110 ° C. and left for 5 minutes. After the elapse of 5 minutes, the transparent resin film is taken out of the oven and stored again in an environment of a temperature of 23 ° C. and a relative humidity of 55% RH for 24 hours.
- thermal shrinkage rate (%) ((L 1 ⁇ L 2 ) / L 1 ) ⁇ 100 Further, the thermal shrinkage rate B of the optical film is calculated in the same manner.
- a 3 mm thick green glass (visible light transmittance Tv: 81%, solar radiation transmittance Te: 63%) serving as an indoor side glass, a film made of polyvinyl butyral having a thickness of 380 ⁇ m serving as an indoor adhesive layer, Optical film 1 produced as described above, film made of polyvinyl butyral having a thickness of 380 ⁇ m serving as an outdoor adhesive layer, clear glass having a thickness of 3 mm serving as outdoor glass (visible light transmittance Tv: 91%, solar transmittance) (Te: 86%) was laminated in this order, and after removing the excess portion protruding from the edge portion of the glass, heating was performed at 140 ° C. for 30 minutes, pressure deaeration was performed, and a laminating process was performed to produce a laminated glass 1. .
- Laminated Glass 14 In the production of the laminated glass 1, gelatin (manufactured by Nitta Gelatin Co., Ltd., fine chemical gelatin) is used as the first water-soluble binder resin instead of PVA-1, and the low refractive index layer of the infrared reflective layer is used.
- the optical film 14 was prepared in the same manner except that the number of layers was changed to 12, the number of high refractive index layers was changed to 11, and the infrared reflective layer was provided on both sides of the transparent resin film. Glass 14 was produced.
- ⁇ No cracks are observed ⁇ : The area of the crack is about 0 to 10% of the total ⁇ : Cracked area is about 10-30% of the whole ⁇ : The area of the cracked portion is about 30 to 50% of the whole XX: The area of the cracked part is about 50% or more of the whole
- the optical film according to the present invention in which the value obtained by dividing the rate by the thermal shrinkage rate of the transparent resin film is within the range of 1 to 3, the infrared reflectance of the optical film can be obtained even when heat treatment is performed under the same conditions as in the production of laminated glass. It can be seen that there is almost no decrease or increase in haze. In addition, it can be seen that the optical film according to the present invention hardly shows cracks in the infrared reflecting layer even after heat treatment, and the constituent layers maintain high adhesion.
- the laminated glass according to the present invention using such an optical film has a high infrared reflectance, a low haze, and no cracks in the infrared reflecting layer. Therefore, according to the present invention, it is possible to suppress peeling between constituent layers and cracking of the infrared reflecting layer due to heating, and it is possible to obtain a laminated glass excellent in infrared reflectance and translucency.
- the present invention is suitable for providing a laminated glass excellent in infrared reflectivity and translucency, which can suppress occurrence of peeling between constituent layers and cracking of an infrared reflective layer by heating.
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Abstract
Description
一般に、合わせガラスは、一対のガラス基板間に光学フィルムが配置されてなり、当該光学フィルムによって太陽光線中の熱線(赤外線)の透過を遮断し、室内の温度上昇や冷房負荷を低減する。
また、一対の板ガラスの間に、高分子樹脂シート上に複数の誘電体膜が積層されてなる近赤外反射基板が配置された近赤外線反射合わせガラスが提供されている(例えば、特許文献2参照)。
すなわち、本発明に係る上記課題は、以下の手段により解決される。
前記赤外線反射層は、第1の水溶性バインダー樹脂と第1の金属酸化物粒子とを含有する高屈折率層と、第2の水溶性バインダー樹脂と第2の金属酸化物粒子とを含有する低屈折率層とが交互に積層されてなり、
前記光学フィルムの熱収縮率を前記透明樹脂フィルムの熱収縮率で除した値が1~3の範囲内であることを特徴とする合わせガラス。
本発明の効果の発現機構ないし作用機構については、明確にはなっていないが、以下のように推察している。
すなわち、本発明に係る合わせガラスによれば、赤外線反射層を構成する高屈折率層と低屈折率層にそれぞれ水溶性バインダー樹脂が含有されており、光学フィルムと赤外線反射層の熱収縮率の関係が上記のように規定されているため、各層の熱収縮率の差が大きくなく、各層の熱収縮率の差に起因する層間の剥離や赤外線反射層のひび割れが抑制されるものと推察している。
また、水溶性バインダー樹脂が含有されず、金属酸化物粒子のみからなる赤外線反射層を有する従来の合わせガラスは、赤外線反射層の最表面が凹凸状になって入射光が散乱するため、ヘイズが高まり、透光性が低下する場合がある。しかしながら、本発明に係る合わせガラスは、赤外線反射層に水溶性バインダー樹脂が含有されているため、赤外線反射層の最表面の凹凸部分が水溶性バインダー樹脂によって埋められる。これにより、本発明の合わせガラスは、赤外線反射層の最表面が平滑であり、光の散乱が低減されてヘイズが低減するため、高い透光性を有するものと推察している。
また、水溶性バインダー樹脂が含有されず、スパッタリング等の方法で形成された赤外線反射層を有する従来の合わせガラスは、金属酸化物粒子同士の間に屈折率が1.0程度(光が直進する)の空気が存在するが、本発明に係る合わせガラスは、赤外線反射層を構成する金属酸化物粒子同士の間に、屈折率が1.5程度の水溶性バインダー樹脂が存在するため、高い赤外線反射率を有するものと推察している。
また、本発明は、赤外線反射層が、透明樹脂フィルムの両面に設けられていることが好ましい。これにより、合わせガラス製造時において光学フィルムの撓みを抑制でき、製造工程を精度良く行うことができるため、品質の高い合わせガラスとすることができる。
また、本発明は、高屈折率層及び低屈折率層が交互に積層された全層数が、11~31層であることが好ましい。これにより、層間の剥離や赤外線反射層のひび割れの発生をより抑制することができ、赤外反射率及び透光性をより向上させることができる。
また、本発明は、第1の水溶性バインダー樹脂が、エチレン変性ポリビニルアルコールであることが好ましい。これにより、層間の剥離や赤外線反射層のひび割れの発生をより抑制することができ、赤外線反射率及び透光性をより向上させることができる。
はじめに、図1を参照して、本発明に係る合わせガラスの基本的な構成について説明する。
図1は、本発明の合わせガラスの一例を示す概略断面図である。
図1において、合わせガラス1は、光学フィルム2と、当該光学フィルム2を挟持する一対のガラス基板8A,8Bとから構成されている。更に、光学フィルム2は、透明樹脂フィルム3上に、第1の水溶性バインダー樹脂と第1の金属酸化物粒子とを含有する高屈折率層5と、第2の水溶性バインダー樹脂と第2の金属酸化物粒子とを含有する低屈折率層6とが交互に積層されてなる赤外線反射層4を有する。更に、光学フィルム2の両面に接着層7A,7Bが設けられ、これにより一対のガラス基板8A,8Bと接着されている。
なお、図示例では、赤外線反射層4が透明樹脂フィルム3の両面に設けられているものとしたが、透明樹脂フィルム3の片面のみに設けられているものとしても良い。
試料(光学フィルム又は透明樹脂フィルム)を温度23℃、相対湿度55%RH環境にて、24時間保存した後、幅方向に100mm間隔で2つの印を付け、無荷重状態で2つの印の間の距離L1を顕微鏡等を用いて測定する。続いて、110℃雰囲気下のオーブン内に試料を吊るし、5分間放置する。5分間経過後、オーブンから当該試料を取り出し、再び温度23℃、相対湿度55%RH環境で24時間保存する。次いで、無荷重状態の試料の2つの印の間の距離L2を顕微鏡等を用いて測定する。測定した距離L1及びL2から、下記式により試料の熱収縮率を算出する。
熱収縮率(%)=((L1-L2)/L1)×100
なお、上記熱収縮率の測定方法は一例であって、温度や湿度、時間等の各種条件は適宜設定変更可能である。
本発明の合わせガラスは、特に車の窓ガラスとして用いられる場合において、可視光透過率が70%以上であることが好ましい。なお、可視光透過率は、例えば、分光光度計(日立製作所株式会社製、U-4000型)を用いて、JIS R3106(1998)「板ガラス類の透過率・反射率・日射熱取得率の試験方法」に準拠して、測定することができる。
本発明に係る合わせガラスに用いられる光学フィルムは、少なくとも透明樹脂フィルム上に少なくとも一層の赤外線反射層を有する構成であり、さらに好ましくは、透明樹脂フィルムの両面に赤外線反射層を有する構成である。本発明に係る光学フィルムは、光学フィルムの熱収縮率を透明樹脂フィルムの熱収縮率で除した値が1~3の範囲内となるように、材料や厚さ等が設定されているものである。
本発明に係る合わせガラスに用いられる透明樹脂フィルムは、光学フィルムの支持体としての役割を果たす。本発明に係る透明樹脂フィルムは、光学フィルムの熱収縮率を透明樹脂フィルムの熱収縮率で除した値が1~3の範囲内となるように、材料や厚さ等が設定されているものである。
本発明に係る赤外線反射層は、太陽光線、特に赤外線成分を遮断する機能を発現するものである。また、赤外線反射層は、第1の水溶性バインダー樹脂と第1の金属酸化物粒子とを含有する高屈折率層と、第2の水溶性バインダー樹脂と第2の金属酸化物粒子とを含有する低屈折率層とを上記説明した透明樹脂フィルム上に交互に積層して形成される積層体である。
XPS表面分析装置としては、特に制限されず、いかなる機種も使用することができるが、例えば、VGサイエンティフィックス社製ESCALAB-200Rを用いることができる。X線アノードにはMgを用い、出力600W(加速電圧15kV、エミッション電流40mA)で測定する。
本発明に係る高屈折率層は、第1の水溶性バインダー樹脂及び第1の金属酸化物粒子を含有し、必要に応じて、硬化剤、その他のバインダー樹脂、界面活性剤、各種添加剤等をさらに含んでも良い。
本発明に係る高屈折率層の屈折率は、好ましくは1.80~2.50であり、より好ましくは1.90~2.20である。
本発明において、第1の水溶性バインダー樹脂は、該第1の水溶性バインダー樹脂が最も溶解する温度で、0.5質量%の濃度に水に溶解させた際、G2グラスフィルター(最大細孔40~50μm)で濾過した場合に濾別される不溶物の質量が、加えた該水溶性バインダー樹脂の50質量%以内であるものをいう。
本発明でいう重量平均分子量は、公知の方法によって測定することができ、例えば、静的光散乱、ゲルパーミエーションクロマトグラフィ法(GPC)、飛行時間型質量分析法(TOF-MASS)などによって測定することができ、本発明では一般的な公知の方法であるゲルパーミエーションクロマトグラフィ法によって測定している。
本発明において、高屈折率層と低屈折率層とは、ケン化度の異なる2種以上のポリビニルアルコールを含むことが好ましい。ここで、区別するために、高屈折率層で用いる第1の水溶性バインダー樹脂としてのポリビニルアルコールをポリビニルアルコール(A)とし、低屈折率層で用いる第2の水溶性バインダー樹脂としてのポリビニルアルコールをポリビニルアルコール(B)という。なお、各屈折率層が、ケン化度や重合度が異なる複数のポリビニルアルコールを含む場合には、各屈折率層中で最も含有量の高いポリビニルアルコールをそれぞれ高屈折率層におけるポリビニルアルコール(A)、及び低屈折率層におけるポリビニルアルコール(B)と称する。
同一層内にケン化度が3mol%以上異なるポリビニルアルコールが含まれる場合、異なるポリビニルアルコールの混合物とみなし、それぞれに重合度とケン化度を算出する。例えば、PVA203:5質量%、PVA117:25質量%、PVA217:10質量%、PVA220:10質量%、PVA224:10質量%、PVA235:20質量%、PVA245:20質量%が含まれる場合、最も含有量の多いPVA(ポリビニルアルコール)は、PVA217~245の混合物であり(PVA217~245のケン化度の差は3mol%以内なので同一のポリビニルアルコールである)、この混合物がポリビニルアルコール(A)又は(B)となる。そうして、PVA217~245の混合物(ポリビニルアルコール(A)又は(B))において、重合度が、(1700×0.1+2000×0.1+2400×0.1+3500×0.2+4500×0.7)/0.7=3200であり、ケン化度は、88mol%となる。
式(1)
P=(〔η〕×103/8.29)(1/0.62)
カチオン性基を有するエチレン性不飽和単量体としては、例えば、トリメチル-(2-アクリルアミド-2,2-ジメチルエチル)アンモニウムクロライド、トリメチル-(3-アクリルアミド-3,3-ジメチルプロピル)アンモニウムクロライド、N-ビニルイミダゾール、N-ビニル-2-メチルイミダゾール、N-(3-ジメチルアミノプロピル)メタクリルアミド、ヒドロキシルエチルトリメチルアンモニウムクロライド、トリメチル-(2-メタクリルアミドプロピル)アンモニウムクロライド、N-(1,1-ジメチル-3-ジメチルアミノプロピル)アクリルアミド等が挙げられる。カチオン変性ポリビニルアルコールのカチオン変性基含有単量体の比率は、酢酸ビニルに対して0.1~10モル%、好ましくは0.2~5モル%である。
変性ポリビニルアルコールの含有量は、特に限定されるものではないが、各屈折率の全質量(固形分)に対し、好ましくは1~30質量%である。このような範囲であれば、上記効果がより発揮される。
例えば、高屈折率層に低ケン化度のポリビニルアルコール(A)を用い、低屈折率層に高ケン化度のポリビニルアルコール(B)を用いる場合には、高屈折率層中のポリビニルアルコール(A)が層中の全ポリビニルアルコール類の全質量に対し、40質量%以上100質量%以下の範囲で含有されることが好ましく、60質量%以上95質量%以下がより好ましく、低屈折率層中のポリビニルアルコール(B)が低屈折率層中の全ポリビニルアルコール類の全質量に対し、40質量%以上100質量%以下の範囲で含有されることが好ましく、60質量%以上95質量%以下がより好ましい。また、高屈折率層に高ケン化度のポリビニルアルコール(A)を用い、低屈折率層に低ケン化度のポリビニルアルコール(B)を用いる場合には、高屈折率層中のポリビニルアルコール(A)が層中の全ポリビニルアルコール類の全質量に対し、40質量%以上100質量%以下の範囲で含有されることが好ましく、60質量%以上95質量%以下がより好ましく、低屈折率層中のポリビニルアルコール(B)が低屈折率層中の全ポリビニルアルコール類の全質量に対し、40質量%以上100質量%以下の範囲で含有されることが好ましく、60質量%以上95質量以下がより好ましい。含有量が40質量%以上であると、層間混合が抑制され、界面の乱れが小さくなるという効果が顕著に現れる。一方、含有量が100質量%以下であれば、塗布液の安定性が向上する。
本発明に係る高屈折率層において、ポリビニルアルコール以外の第1の水溶性バインダー樹脂としては、第1の金属酸化物粒子を含有した高屈折率層が塗膜を形成することができれば、いかなるものでも制限なく使用可能である。また、後述する低屈折率層においても、ポリビニルアルコール以外の第2の水溶性バインダー樹脂としては、前記と同様に、第2の金属酸化物粒子を含有した低屈折率層が塗膜を形成することができれば、どのようなものでも制限なく使用可能である。ただし、環境の問題や塗膜の柔軟性を考慮すると、水溶性高分子(特にゼラチン、増粘多糖類、反応性官能基を有するポリマー)が好ましい。これらの水溶性高分子は単独で用いても良いし、2種類以上を混合して用いても良い。
本発明に適用可能なゼラチンとしては、従来、ハロゲン化銀写真感光材料分野で広く用いられてきた各種ゼラチンを適用することができ、例えば、酸処理ゼラチン、アルカリ処理ゼラチンの他に、ゼラチンの製造過程で酵素処理をする酵素処理ゼラチン及びゼラチン誘導体、すなわち分子中に官能基としてのアミノ基、イミノ基、ヒドロキシル基、カルボキシル基を有し、それと反応し得る基を持った試薬で処理し改質したものであっても良い。ゼラチンの一般的製造法に関しては良く知られており、例えば、T.H.James:The Theory of Photographic Process 4th. ed. 1977(Macmillan)55項、科学写真便覧(上)72~75項(丸善)、写真工学の基礎-銀塩写真編119~124頁(コロナ社)等の記載を参考にすることができる。また、リサーチ・ディスクロージャー誌第176巻、No.17643(1978年12月)のIX項に記載されているゼラチンを挙げることができる。
ゼラチンを用いる場合、必要に応じてゼラチンの硬膜剤を添加することもできる。
使用できる硬膜剤としては、通常の写真乳剤層の硬膜剤として使用されている公知の化合物を使用でき、例えば、ビニルスルホン化合物、尿素-ホルマリン縮合物、メラニン-ホルマリン縮合物、エポキシ系化合物、アジリジン系化合物、活性オレフィン類、イソシアネート系化合物などの有機硬膜剤、クロム、アルミニウム、ジルコニウムなどの無機多価金属塩類などを挙げることができる。
本発明で用いることのできるセルロース類としては、水溶性のセルロース誘導体を好ましく用いることができ、例えば、カルボキシメチルセルロース(セルロースカルボキシメチルエーテル)、メチルセルロース、ヒドロキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロース等の水溶性セルロース誘導体や、カルボン酸基含有セルロース類であるカルボキシメチルセルロース(セルロースカルボキシメチルエーテル)、カルボキシエチルセルロース等を挙げることができる。その他には、ニトロセルロース、セルロースアセテートプロピオネート、酢酸セルロース、セルロース硫酸エステル等のセルロース誘導体を挙げることができる。
本発明で用いることのできる増粘多糖類としては、特に制限はなく、例えば、一般に知られている天然単純多糖類、天然複合多糖類、合成単純多糖類及び合成複合多糖類を挙げることができ、これら多糖類の詳細については、「生化学事典(第2版),東京化学同人出版」、「食品工業」第31巻(1988)21頁等を参照することができる。
本発明に適用可能な水溶性高分子としては、反応性官能基を有するポリマー類が挙げられ、例えば、ポリビニルピロリドン類、ポリアクリル酸、アクリル酸-アクリルニトリル共重合体、アクリル酸カリウム-アクリルニトリル共重合体、酢酸ビニル-アクリル酸エステル共重合体、若しくはアクリル酸-アクリル酸エステル共重合体などのアクリル系樹脂、スチレン-アクリル酸共重合体、スチレン-メタクリル酸共重合体、スチレン-メタクリル酸-アクリル酸エステル共重合体、スチレン-α-メチルスチレン-アクリル酸共重合体、若しくはスチレン-α-メチルスチレン-アクリル酸-アクリル酸エステル共重合体などのスチレンアクリル酸樹脂、スチレン-スチレンスルホン酸ナトリウム共重合体、スチレン-2-ヒドロキシエチルアクリレート共重合体、スチレン-2-ヒドロキシエチルアクリレート-スチレンスルホン酸カリウム共重合体、スチレン-マレイン酸共重合体、スチレン-無水マレイン酸共重合体、ビニルナフタレン-アクリル酸共重合体、ビニルナフタレン-マレイン酸共重合体、酢酸ビニル-マレイン酸エステル共重合体、酢酸ビニル-クロトン酸共重合体、酢酸ビニル-アクリル酸共重合体などの酢酸ビニル系共重合体及びそれらの塩が挙げられる。これらの中で、特に好ましい例としては、ポリビニルピロリドン類及びこれを含有する共重合体が挙げられる。
本発明に係る高屈折率層に適用可能な第1の金属酸化物粒子としては、屈折率が2.0以上、3.0以下である金属酸化物粒子が好ましい。更に、具体的には、例えば、酸化チタン、酸化ジルコニウム、酸化亜鉛、合成非晶質シリカ、コロイダルシリカ、アルミナ、コロイダルアルミナ、チタン酸鉛、鉛丹、黄鉛、亜鉛黄、酸化クロム、酸化第二鉄、鉄黒、酸化銅、酸化マグネシウム、水酸化マグネシウム、チタン酸ストロンチウム、酸化イットリウム、酸化ニオブ、酸化ユーロピウム、酸化ランタン、ジルコン、酸化スズなどが挙げられる。また、複数の金属で構成された複合酸化物粒子やコア・シェル状に金属構成が変化するコア・シェル粒子等を用いることもできる。
本発明に係るコア・シェル粒子のコアに用いられる酸化チタン粒子を含む水溶液は、pHが1.0~3.0であり、かつチタン粒子のゼータ電位が正である水系の酸化チタンゾルの表面を、疎水化して有機溶剤に分散可能な状態にしたものを用いることが好ましい。
なお、本発明に係る第1の金属酸化物粒子の体積平均粒径とは、粒子そのものをレーザー回折散乱法、動的光散乱法、又は電子顕微鏡を用いて観察する方法や、屈折率層の断面や表面に現れた粒子像を電子顕微鏡で観察する方法により、1,000個の任意の粒子の粒径を測定し、それぞれd1、d2・・・di・・・dkの粒径を持つ粒子がそれぞれn1、n2・・・ni・・・nk個存在する粒子状の金属酸化物の集団において、粒子1個当りの体積をviとした場合に、体積平均粒径mv={Σ(vi・di)}/{Σ(vi)}で表される体積で重み付けされた平均粒径である。
本発明においては、高屈折率層に適用する第1の水溶性バインダー樹脂を硬化させるため、硬化剤を使用することもできる。第1の水溶性バインダー樹脂と共に用いることができる硬化剤としては、当該第1の水溶性バインダー樹脂と硬化反応を起こすものであれば特に制限はない。例えば、第1の水溶性バインダー樹脂として、ポリビニルアルコールを用いる場合では、硬化剤として、ホウ酸及びその塩が好ましい。ホウ酸及びその塩以外にも公知のものが使用でき、一般的には、ポリビニルアルコールと反応し得る基を有する化合物又はポリビニルアルコールが有する異なる基同士の反応を促進するような化合物であり、適宜選択して用いられる。硬化剤の具体例としては、例えば、エポキシ系硬化剤(例えば、ジグリシジルエチルエーテル、エチレングリコールジグリシジルエーテル、1,4-ブタンジオールジグリシジルエーテル、1,6-ジグリシジルシクロヘキサン、N,N-ジグリシジル-4-グリシジルオキシアニリン、ソルビトールポリグリシジルエーテル、グリセロールポリグリシジルエーテル等)、アルデヒド系硬化剤(例えば、ホルムアルデヒド、グリオキザール等)、活性ハロゲン系硬化剤(例えば、2,4-ジクロロ-4-ヒドロキシ-1,3,5,-s-トリアジン等)、活性ビニル系化合物(例えば、1,3,5-トリスアクリロイル-ヘキサヒドロ-s-トリアジン、ビスビニルスルホニルメチルエーテル等)、アルミニウム明礬等が挙げられる。
ホウ酸及びその塩とは、硼素原子を中心原子とする酸素酸及びその塩のことをいい、具体的には、オルトホウ酸、二ホウ酸、メタホウ酸、四ホウ酸、五ホウ酸及び八ホウ酸及びそれらの塩が挙げられる。
本発明に係る低屈折率層は、第2の水溶性バインダー樹脂及び第2の金属酸化物粒子を含み、更には、硬化剤、表面被覆成分、粒子表面保護剤、バインダー樹脂、界面活性剤、各種添加剤等を含んでも良い。
本発明に係る低屈折率層の屈折率は、好ましくは1.10~1.60であり、より好ましくは1.30~1.50である。
本発明に係る低屈折率層に適用する第2の水溶性バインダー樹脂として、ポリビニルアルコールが好ましく用いられる。更に、前記高屈折率層に存在するポリビニルアルコール(A)のケン化度とは異なるポリビニルアルコール(B)が、本発明に係る低屈折率層に用いられることがより好ましい。なお、ここでの第2の水溶性バインダー樹脂の好ましい重量平均分子量等、ポリビニルアルコール及びポリビニルアルコール(B)についての説明は、上記高屈折率層の第1の水溶性バインダー樹脂にて説明されており、ここでは説明を省略する。
本発明に係る低屈折率層において適用が可能な、ポリビニルアルコール以外の第2の水溶性バインダー樹脂としては、金属酸化物粒子を含有した低屈折率層が塗膜を形成することができればどのようなものでも制限なく使用可能である。ただし、環境の問題や塗膜の柔軟性を考慮すると、水溶性高分子(特にゼラチン、増粘多糖類、反応性官能基を有するポリマー)が好ましい。これらの水溶性高分子は単独で用いても構わないし、2種類以上を混合して用いても構わない。
本発明に係る低屈折率層に適用する第2の金属酸化物粒子としては、シリカ(二酸化ケイ素)を用いることが好ましく、具体的な例として合成非晶質シリカ、コロイダルシリカ等が挙げられる。これらのうち、酸性のコロイダルシリカゾルを用いることがより好ましく、有機溶媒に分散させたコロイダルシリカゾルを用いることがさらに好ましい。また、屈折率をより低減させるためには、低屈折率層に適用する第2の金属酸化物粒子として、粒子の内部に空孔を有する中空微粒子を用いることができ、特にシリカ(二酸化ケイ素)の中空微粒子が好ましい。
低屈折率層に適用する第2の金属酸化物微粒子の平均粒径は、粒子そのもの又は屈折率層の断面や表面に現れた粒子を電子顕微鏡で観察し、1000個の任意の粒子の粒径を測定し、その単純平均値(個数平均)として求められる。ここで、個々の粒子の粒径は、その投影面積に等しい円を仮定したときの直径で表したものである。
このようなコロイダルシリカは、合成品が用いても良いし、市販品が用いても良い。コロイダルシリカは、その表面がカチオン変性されたものであっても良く、また、Al、Ca、Mg又はBa等で処理されたものであっても良い。
本発明に係る低屈折率層において、前記高屈折率層と同様に、硬化剤をさらに含有させることができる。低屈折率層に含まれる第2の水溶性バインダー樹脂と硬化反応を起こすものであれば、特に制限されない。特に、低屈折率層に適用する第2の水溶性バインダー樹脂としてポリビニルアルコールを用いた場合の硬化剤としては、ホウ酸及びその塩並びに/又はホウ砂が好ましい。また、ホウ酸及びその塩以外にも公知のものが使用できる。
特に、第2の水溶性バインダー樹脂としてポリビニルアルコールを使用する場合の上記硬化剤の総使用量は、ポリビニルアルコール1g当たり1~600mgが好ましく、ポリビニルアルコール1g当たり100~600mgがより好ましい。
本発明に係る高屈折率層及び低屈折率層には、必要に応じて各種の添加剤を含有させることができる。また、高屈折率層における添加剤の含有量は、高屈折率層の固形分100質量%に対して、0~20質量%であることが好ましい。当該添加剤の例を以下に記載する。
本発明においては、高屈折率層及び低屈折率層の少なくとも1層が、さらに界面活性剤を含有しても良い。界面活性剤としては、両性イオン系、カチオン系、アニオン系、ノニオン系のいずれの種類も使用することができる。より好ましくは、ベタイン系両性イオン性界面活性剤、4級アンモニウム塩系カチオン性界面活性剤、ジアルキルスルホコハク酸塩系アニオン性界面活性剤、アセチレングリコール系ノニオン性界面活性剤、又はフッ素系カチオン性界面活性剤が好ましい。
本発明に係る高屈折率層又は低屈折率層は、等電点が6.5以下のアミノ酸を含有していても良い。アミノ酸を含むことにより、高屈折率層又は低屈折率層中の第1又は第2の金属酸化物粒子の分散性が向上しうる。
本発明に係る高屈折率層又は低屈折率層は、エマルジョン樹脂をさらに含有していても良い。エマルジョン樹脂を含むことにより、膜の柔軟性が高くなりガラスへの貼りつけ等の加工性が向上する。
ヒドロキシ基を有する高分子分散剤とは、重量平均分子量が10000以上の高分子の分散剤で、側鎖又は末端にヒドロキシ基が置換されたものであり、例えば、ポリアクリル酸ソーダ、ポリアクリルアミドのようなアクリル系の高分子で2-エチルヘキシルアクリレートが共重合されたもの、ポリエチレングリコールやポリプロピレングリコールのようなポリエーテルなどが挙げられる。
本発明においては、高屈折率層及び低屈折率層の少なくとも1層が、さらにリチウム化合物を含有しても良い。該リチウム化合物を含む高屈折率層用塗布液又は低屈折率層用塗布液は粘度の制御がより容易となり、その結果、ガラスに本発明の光学フィルムを加える際の製造安定性がより向上する。
これらの中でも、水酸化リチウムが本願発明の効果を十分に発揮できる観点から好ましい。
本発明に係る高屈折率層及び低屈折率層に適用可能な各種の添加剤を、以下に列挙する。例えば、特開昭57-74193号公報、特開昭57-87988号公報、及び特開昭62-261476号公報に記載の紫外線吸収剤、特開昭57-74192号、特開昭57-87989号公報、特開昭60-72785号公報、特開昭61-146591号公報、特開平1-95091号公報、及び特開平3-13376号公報等に記載されている退色防止剤、アニオン、カチオン又はノニオンの各種界面活性剤、特開昭59-42993号公報、特開昭59-52689号公報、特開昭62-280069号公報、特開昭61-242871号公報、及び特開平4-219266号公報等に記載されている蛍光増白剤、硫酸、リン酸、酢酸、クエン酸、水酸化ナトリウム、水酸化カリウム、炭酸カリウム等のpH調整剤、消泡剤、ジエチレングリコール等の潤滑剤、防腐剤、防黴剤、帯電防止剤、マット剤、熱安定剤、酸化防止剤、難燃剤、結晶核剤、無機粒子、有機粒子、減粘剤、滑剤、赤外線吸収剤、色素、顔料等の公知の各種添加剤などが挙げられる。
本発明に係る赤外線反射層の形成方法は、特に制限されないが、透明樹脂フィルム上に、第1の水溶性バインダー樹脂及び第1の金属酸化物粒子を含む高屈折率層用塗布液と、第2の水溶性バインダー樹脂及び第2の金属酸化物粒子を含む低屈折率層用塗布液と、を塗布する工程を含む製造方法が好ましい。
高屈折率層用塗布液及び低屈折率層用塗布液を調製するための溶媒は、特に制限されないが、水、有機溶媒又はその混合溶媒が好ましい。
高屈折率層用塗布液中の第1の水溶性バインダー樹脂の濃度は、1~10質量%の範囲内であることが好ましい。また、高屈折率層用塗布液中の第1の金属酸化物粒子の濃度は、1~50質量%の範囲内であることが好ましい。
低屈折率層用塗布液中の第2の水溶性バインダー樹脂の濃度は、1~10質量%の範囲内であることが好ましい。また、低屈折率層用塗布液中の第2の金属酸化物粒子の濃度は、1~50質量%の範囲内であることが好ましい。
本発明においては、これら各材料の濃度を変更することで、光学フィルムの熱収縮率を変化させることができ、光学フィルムの熱収縮率を透明樹脂フィルムの熱収縮率で除した値を1~3の範囲内に調整することができる。
高屈折率層用塗布液及び低屈折率層用塗布液の調製方法は、特に制限されず、例えば、水溶性バインダー樹脂、金属酸化物粒子、及び必要に応じて添加されるその他の添加剤を添加し、攪拌混合する方法が挙げられる。この際、水溶性バインダー樹脂、金属酸化物粒子、及び必要に応じて用いられるその他の添加剤の添加順も特に制限されず、攪拌しながら各成分を順次添加し混合しても良いし、攪拌しながら一度に添加し混合しても良い。必要に応じて、さらに溶媒を用いて、適当な粘度に調製される。
スライドホッパー塗布法により同時重層塗布を行う際の高屈折率層用塗布液及び低屈折率層用塗布液の40~45℃における粘度は、5~300mPa・sの範囲内が好ましく、10~250mPa・sの範囲内がより好ましい。また、スライド型カーテン塗布法により同時重層塗布を行う際の高屈折率層用塗布液及び低屈折率層用塗布液の40~45℃における粘度は、5~1200mPa・sの範囲内が好ましく、25~500mPa・s内の範囲がより好ましい。
また、高屈折率層用塗布液及び低屈折率層用塗布液の15℃における粘度は、10mPa・s以上が好ましく、15~30000mPa・sの範囲内がより好ましく、20~20000mPa・sの範囲内がさらに好ましく、20~18000mPa・sの範囲内が特に好ましい。
塗布及び乾燥方法は、特に制限されないが、高屈折率層用塗布液及び低屈折率層用塗布液を30℃以上に加温して、透明樹脂フィルム上に高屈折率層用塗布液及び低屈折率層用塗布液の同時重層塗布を行った後、形成した塗膜の温度を好ましくは1~15℃に一旦冷却し(セット)、その後10℃以上で乾燥することが好ましい。より好ましい乾燥条件は、湿球温度5~50℃、膜面温度10~50℃の範囲の条件である。また、塗布直後の冷却方式としては、形成された塗膜の均一性向上の観点から、水平セット方式で行うことが好ましい。
本発明に係る光学フィルムにおいては、透明樹脂フィルム上に、さらなる機能の付加を目的として、導電性層、帯電防止層、ガスバリア層、易接着層(接着層)、防汚層、消臭層、流滴層、易滑層、ハードコート層、耐摩耗性層、反射防止層、電磁波シールド層、紫外線吸収層、赤外吸収層、印刷層、蛍光発光層、ホログラム層、剥離層、接着層、接着層、本発明の高屈折率層及び低屈折率層以外の赤外線カット層(金属層、液晶層)、着色層(可視光線吸収層)などの機能層を有していても良い。以下、好ましい機能層である赤外吸収層、断熱層及びハードコート層について説明する。
本発明に係る光学フィルムは、赤外吸収層をさらに含むことができる。当該赤外吸収層は、任意の位置に積層されるが、本発明の合わせガラスの遮熱効果をより効率的に得るためには、入射光側から見て赤外線反射層より下に積層されることが好ましく、さらに透明樹脂フィルムの赤外線反射層が積層される面と反対の面に積層されることがより好ましい。また、他の層、例えば、ハードコート層に赤外吸収剤を含有させても、赤外吸収層として機能する。
本発明においては、透明樹脂フィルムのいずれか一方の側に空隙を有する断熱層(以下、単に断熱層とも称する)を有することができる。断熱層を有することにより、いわゆる熱割れのリスクを低減させることができる。更に、本発明の合わせガラスの遮熱効果をより向上することができる。
熱伝導率は、例えば、熱線プローブ式熱伝導率測定装置(京都電子工業株式会社製、QTM-500)を用いて測定することができる。
本発明の断熱層を形成する方法としては、特に制限されないが、断熱層が無機酸化物粒子とポリマーバインダとを含む場合は、湿式塗布方式が好ましい。具体的には、無機酸化物粒子、ポリマーバインダ、及び必要に応じて架橋剤を溶媒と混合し、塗布液を調製した後、基材上に塗布して乾燥することにより形成することができる。
本発明に係る光学フィルムは、耐擦過性を高めるための表面保護層として、赤外吸収顔料などを含むハードコート層を積層することが好ましい。
本発明に係る合わせガラスは、上記光学フィルムの両面に接着層が設けられ、これによりガラス基板が接合される。
次いで、本発明の合わせガラスに適用されるガラス基板について説明する。
本発明に係るガラス基板としては、市販のガラスを用いることができる。ガラスの種類は特に限定されないが、通常、ソーダライムシリカガラスが好適に用いられる。この場合、無色透明ガラスであって良いし、有色透明ガラスであっても良い。
(低屈折率層用塗布液L1の調製)
まず、10質量%の第2の金属酸化物粒子としてのコロイダルシリカ(日産化学工業株式会社製、スノーテックス(登録商標)OXS)水溶液680部と、4.0質量%のポリビニルアルコール(株式会社クラレ製、PVA-103:重合度300、ケン化度98.5mol%)水溶液30部と、3.0質量%のホウ酸水溶液150部とを混合し、分散した。純水を加え、全体として1000部のコロイダルシリカ分散液L1を調製した。
次いで、得られたコロイダルシリカ分散液L1を45℃に加熱し、その中に4.0質量%の第2の水溶性バインダー樹脂としてのポリビニルアルコール(日本酢ビ・ポバール株式会社製、JP-45:重合度4500、ケン化度86.5~89.5mol%)水溶液を760部とを順次に、攪拌しながら添加した。その後、1.0質量%のベタイン系界面活性剤(川研ファインケミカル株式会社製、ソフダゾリン(商品名)LSB-R)水溶液の40部を添加し、低屈折率層用塗布液L1を調製した。
水中に、酸化チタン水和物を懸濁させ、TiO2に換算した時の濃度が100g/Lとなるように、酸化チタンの水性懸濁液を調製した。10L(リットル)の当該懸濁液に、30Lの水酸化ナトリウム水溶液(濃度:10モル/L)を撹拌しながら加えた後、90℃に加熱し、5時間熟成させた。次いで、塩酸を用いて中和し、濾過後、水を用いて洗浄した。なお、上記反応(処理)において、原料である酸化チタン水和物は、公知の手法に従い、硫酸チタン水溶液を熱加水分解処理によって得られたものである。
重層塗布可能なスライドホッパー塗布装置を用い、上記調製した低屈折率層用塗布液L1及び高屈折率層用塗布液H1を45℃に保温しながら、45℃に加温した厚さ50μmの透明樹脂フィルムとしてのポリエチレンテレフタレートフィルム(東洋紡株式会社製、コスモシャインA4300(PET-1))上に、高屈折率層及び低屈折率層のそれぞれの乾燥時の膜厚が130nmになるように、低屈折率層6層と、高屈折率層5層とを交互に計11層の同時重層塗布を行った。
このようにして、光学フィルム1を作製した。
すなわち、透明樹脂フィルムを温度23℃、相対湿度55%RH環境にて、24時間保存した後、幅方向に100mm間隔で2つの印を付け、無荷重状態で2つの印の間の距離L1を顕微鏡等を用いて測定する。続いて、110℃雰囲気下のオーブン内に透明樹脂フィルムを吊るし、5分間放置する。5分間経過後、オーブンから当該透明樹脂フィルムを取り出し、再び温度23℃、相対湿度55%RH環境で24時間保存する。次いで、無荷重状態の透明樹脂フィルムの2つの印の間の距離L2を顕微鏡等を用いて測定する。測定した距離L1及びL2より、透明樹脂フィルムの熱収縮率を下記式により算出する。
熱収縮率(%)=((L1-L2)/L1)×100
また、光学フィルムの熱収縮率Bも同様にして算出する。
次に、室内側ガラスとなる厚さ3mmのグリーンガラス(可視光透過率Tv:81%、日射透過率Te:63%)、室内側の接着層となる厚さ380μmのポリビニルブチラールからなる膜、上記で作製された光学フィルム1、室外側の接着層となる厚さ380μmのポリビニルブチラールからなる膜、室外側ガラスとなる厚さ3mmのクリアガラス(可視光透過率Tv:91%、日射透過率Te:86%)をこの順に積層し、ガラスのエッジ部からはみ出した余剰部分を除去した後、140℃で30分間加熱し、加圧脱気して合わせ処理を行い、合わせガラス1を作製した。
上記合わせガラス1の作製において、赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム2を作製し、更に合わせガラス2を作製した。
上記合わせガラス1の作製において、透明樹脂フィルムとして、PET-1の代わりに、ポリエチレンテレフタレートフィルム(三菱樹脂株式会社製、ダイアホイルT900E50シリーズ(PET-2))を使用した以外は同様にして、光学フィルム3を作製し、更に合わせガラス3を作製した。
上記合わせガラス1の作製において、透明樹脂フィルムとして、PET-1の代わりに、PET-2を使用し、赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム4を作製し、更に合わせガラス4を作製した。
上記合わせガラス1の作製において、透明樹脂フィルムとして、PET-1の代わりに、PET-2を使用し、赤外線反射層の低屈折率層の層数を12層、高屈折率層の層数を11層に変更した以外は同様にして、光学フィルム5を作製し、更に合わせガラス5を作製した。
上記合わせガラス1の作製において、透明樹脂フィルムとして、PET-1の代わりに、PET-2を使用し、赤外線反射層の低屈折率層の層数を12層、高屈折率層の層数を11層に変更し、更に、当該赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム6を作製し、更に合わせガラス6を作製した。
上記合わせガラス1の作製において、透明樹脂フィルムとして、PET-1の代わりに、PET-2を使用し、赤外線反射層の低屈折率層の層数を16層、高屈折率層の層数を15層に変更し、更に、当該赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム7を作製し、更に合わせガラス7を作製した。
上記合わせガラス1の作製において、透明樹脂フィルムとして、PET-1の代わりに、PET-2を使用し、赤外線反射層の低屈折率層の層数を21層、高屈折率層の層数を20層に変更し、更に、当該赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム8を作製し、更に合わせガラス8を作製した。
上記合わせガラス1の作製において、透明樹脂フィルムとして、PET-1の代わりに、PET-2を使用し、赤外線反射層の低屈折率層の層数を5層、高屈折率層の層数を4層に変更し、更に、当該赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム9を作製し、更に合わせガラス9を作製した。
上記合わせガラス1の作製において、透明樹脂フィルムとして、PET-1の代わりに、PET-2を使用し、第1の水溶性バインダー樹脂として、PVA-1の代わりに、ポリビニルアルコール(株式会社クラレ製、PVAエクセバールRS1117(PVA-2))を使用し、赤外線反射層の低屈折率層の層数を12層、高屈折率層の層数を11層に変更し、更に、当該赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム10を作製し、更に合わせガラス10を作製した。
上記合わせガラス1の作製において、第1の水溶性バインダー樹脂として、PVA-1の代わりに、PVA-2を使用し、赤外線反射層の低屈折率層の層数を12層、高屈折率層の層数を11層に変更し、更に、当該赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム11を作製し、更に合わせガラス11を作製した。
上記合わせガラス1の作製において、透明樹脂フィルムとして、PET-1の代わりに、トリアセチルセルロース(コニカミノルタ製、KM4∪A(TAC))を使用し、第1の水溶性バインダー樹脂として、PVA-1の代わりに、PVA-2を使用し、更に、当該赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム12を作製し、更に合わせガラス12を作製した。
上記合わせガラス1の作製において、透明樹脂フィルムとして、PET-1の代わりに、TACを使用し、第1の水溶性バインダー樹脂として、PVA-1の代わりに、PVA-2を使用し、赤外線反射層の低屈折率層の層数を12層、高屈折率層の層数を11層に変更し、更に、当該赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム13を作製し、更に合わせガラス13を作製した。
上記合わせガラス1の作製において、第1の水溶性バインダー樹脂として、PVA-1の代わりに、ゼラチン(新田ゼラチン株式会社製、ファインケミカル用ゼラチン)を使用し、赤外線反射層の低屈折率層の層数を12層、高屈折率層の層数を11層に変更し、更に、当該赤外線反射層を透明樹脂フィルムの両面に設けた以外は同様にして、光学フィルム14を作製し、更に合わせガラス14を作製した。
透明樹脂フィルムとしての1000mm×1000mm×厚さ100μmのPET-1を洗浄・乾燥し、スパッタ製膜装置にセットして、その表面に、高屈折率層として膜厚105nmのTiO2膜を11層、低屈折率層として膜厚175nmのSiO2膜を11層、交互に積層して赤外線反射層を形成し、光学フィルム15を作製した。
作製した光学フィルム15に対し、合わせガラス1の作製と同様にしてガラス基板を接合し、合わせガラス15を作製した。
上記合わせガラス15の作製において、赤外線反射層の低屈折率層の層数を5層、高屈折率層の層数を5層に変更した以外は同様にして、光学フィルム16を作製し、更に合わせガラス16を作製した。
上記合わせガラス15の作製において、透明樹脂フィルムとして、PET-1の代わりに、PET-2を使用した以外は同様にして、光学フィルム17を作製し、更に合わせガラス17を作製した。
上記合わせガラス15の作製において、透明樹脂フィルムとして、PET-1の代わりに、PET-2を使用し、赤外線反射層の低屈折率層の層数を5層、高屈折率層の層数を5層に変更した以外は同様にして、光学フィルム18を作製し、更に合わせガラス18を作製した。
上記光学フィルム1~18及び合わせガラス1~18の作製時の各種条件を表1に示す。
上記のようにして作製した各光学フィルム1~18を、ガラス基板接合時と同じ条件(140℃で30分間)で加熱処理し、その加熱処理の前後で、下記に示すように赤外線反射率(%)測定、ヘイズ測定、ひび割れ評価及び碁盤目接着性試験を行った。
また、上記のようにして作製した各合わせガラス1~18に対し、同様に、赤外線反射率測定、ヘイズ測定及びひび割れ評価を行った。評価結果を表2に示す。
分光光度計(積分球使用、日立製作所社製、U-4000型)を用い、各光学フィルム1~18の800~1400nmの領域における反射率を測定し、その平均値を求め、これを赤外反射率(%)とした。
ヘイズメーター(日本電色工業株式会社製、NDH2000型)を用い、JIS K-7136に従って測定した。
加熱処理前後の光学フィルム1~18及び合わせガラス1~18について、温度23℃、相対湿度55%RH環境で、24時間保存した後、目視にてひび割れの観察を行った。
○:ひび割れ部分の面積が全体の約0~10%
△:ひび割れ部分の面積が全体の約10~30%
×:ひび割れ部分の面積が全体の約30~50%
××:ひび割れ部分の面積が全体の約50%以上
JIS K-5400に従って碁盤目100マスクロスカットした際のテープ剥離試験を行い、下記の基準で膜密着性を評価した。
◎:膜剥離が0マス
○:膜剥離が1~5マス
△:膜剥離が6~10マス
×:膜剥離が11~20マス
××:膜剥離が21マス以上
更に、そのような光学フィルムを用いた本発明に係る合わせガラスは、赤外線反射率が高くヘイズも低く抑えられ、赤外線反射層のひび割れも発生していないことが分かる。
したがって、本発明によれば、加熱によって構成層間の剥離や赤外線反射層の割れが発生することを抑制でき、赤外線反射率及び透光性に優れる合わせガラスを得ることができる。
2 光学フィルム
3 透明樹脂フィルム
4 赤外線反射層
5 高屈折率層
6 低屈折率層
7A 接着層
7B 接着層
8A ガラス基板
8B ガラス基板
Claims (4)
- 透明樹脂フィルム上に少なくとも一層の赤外線反射層を有する光学フィルムと、前記光学フィルムを挟持する一対のガラス基板と、を有する合わせガラスにおいて、
前記赤外線反射層は、第1の水溶性バインダー樹脂と第1の金属酸化物粒子とを含有する高屈折率層と、第2の水溶性バインダー樹脂と第2の金属酸化物粒子とを含有する低屈折率層とが交互に積層されてなり、
前記光学フィルムの熱収縮率を前記透明樹脂フィルムの熱収縮率で除した値が1~3の範囲内であることを特徴とする合わせガラス。 - 前記赤外線反射層が、前記透明樹脂フィルムの両面に設けられていることを特徴とする請求項1に記載の合わせガラス。
- 前記高屈折率層及び前記低屈折率層が交互に積層された全層数が、11~31層であることを特徴とする請求項1又は請求項2に記載の合わせガラス。
- 前記第1の水溶性バインダー樹脂が、エチレン変性ポリビニルアルコールであることを特徴とする請求項1から請求項3までのいずれか一項に記載の合わせガラス。
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EP2980034A1 (en) | 2016-02-03 |
US20160054492A1 (en) | 2016-02-25 |
CN105102395A (zh) | 2015-11-25 |
EP2980034A4 (en) | 2016-12-21 |
JPWO2014156822A1 (ja) | 2017-02-16 |
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