WO2014024873A1 - 光反射フィルムおよびこれを用いた光反射体 - Google Patents
光反射フィルムおよびこれを用いた光反射体 Download PDFInfo
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- WO2014024873A1 WO2014024873A1 PCT/JP2013/071229 JP2013071229W WO2014024873A1 WO 2014024873 A1 WO2014024873 A1 WO 2014024873A1 JP 2013071229 W JP2013071229 W JP 2013071229W WO 2014024873 A1 WO2014024873 A1 WO 2014024873A1
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Images
Classifications
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- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- 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
- C03C17/3657—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 having optical properties
- C03C17/366—Low-emissivity or solar control coatings
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- 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
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J129/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
- C09J129/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
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- G—PHYSICS
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/12—Optical coatings produced by application to, or surface treatment of, optical elements by surface treatment, e.g. by irradiation
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
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- 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
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- 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
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- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- G02B5/285—Interference filters comprising deposited thin solid films
- G02B5/287—Interference filters comprising deposited thin solid films comprising at least one layer of organic material
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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
- B32B2250/00—Layers arrangement
- B32B2250/42—Alternating layers, e.g. ABAB(C), AABBAABB(C)
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- 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
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- C—CHEMISTRY; METALLURGY
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- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2244—Oxides; Hydroxides of metals of zirconium
Definitions
- the present invention relates to a light reflecting film and a light reflector using the same.
- a laminated film in which a light reflecting layer including a high refractive index layer and a low refractive index layer is disposed on a substrate selectively reflects light of a specific wavelength. Therefore, the above laminated film is used in various applications as a light reflecting film that shields light having a predetermined wavelength.
- a laminated film that shields infrared rays that are heat rays while transmitting visible light is used as an infrared shielding film for building windows and vehicle members.
- Patent Document 1 discloses an infrared reflecting film (infrared shielding film) configured by alternately laminating a high refractive index layer and a low refractive index layer on a base material. Has been. At this time, it is disclosed that at least one of the high refractive index layer and the low refractive index layer contains metal oxide particles, a lithium compound, and a water-soluble polymer. Patent Document 1 describes that the infrared reflective film can reflect infrared rays and has high visible light permeability, heat shielding performance, light resistance, and radio wave permeability. . Patent Document 1 describes that the infrared reflective film is used as a sheet or film that is bonded to a vehicle or building window via an easy-adhesive layer for the purpose of imparting heat shielding properties. Yes.
- Patent Document 2 discloses (A) an active energy ray-curable silicone acrylic copolymer; (B) an active energy ray-curable polyfunctional compound; and (C) a conductive material.
- a hard coat composition comprising: (a) an active energy ray-curable silicone acrylic copolymer comprising: (a-1) a polysiloxane block having a predetermined structure; (a-2) active energy A hard coat composition having a linear curable double bond group-containing acrylic block and (a-3) a fluoroalkyl group-containing acrylic block is described.
- Patent Document 2 describes that a hard coat layer formed from the hard coat composition is excellent in antifouling property, antifouling durability, scratch resistance, abrasion resistance, and antistatic property. .
- an object of the present invention is to provide a light reflecting film having improved adhesion between the light reflecting layer and the hard coat layer.
- the present inventors have found that the problem of the present invention can be solved by providing a resin adhesive layer containing a predetermined resin between the light reflecting layer and the hard coat layer. It came to complete.
- a light reflector comprising: a substrate; and the light reflecting film according to any one of (1)
- a light reflecting film with improved adhesion of the hard coat layer to the light reflecting layer can be provided.
- a light reflecting film in which a light reflecting layer including a high refractive index layer and a low refractive index layer, a resin adhesive layer, and a hard coat layer are laminated in this order on a substrate.
- the hard coat layer contains an active energy ray curable resin.
- the resin adhesive layer includes at least one selected from the group consisting of polyvinyl acetal resins, acrylic resins, and urethane resins.
- the light beam reflected by the light reflecting film can be adjusted by appropriately controlling the optical film thickness of the light reflecting layer.
- the optical film thickness of the light reflecting layer For example, when reflecting light (ultraviolet light) having a wavelength of 200 to 400 nm, it becomes an ultraviolet shielding film, and when reflecting light (visible light) having a wavelength of 400 to 700 nm, it becomes a visible light colored film, and has a wavelength of 700 to 700 nm.
- a 1200 nm light ray (infrared ray) is reflected, it can be an infrared shielding film.
- the wavelength and reflectance of the reflected light beam can be controlled to obtain a metallic glossy film.
- the light ray that can be shielded by the light reflection film is preferably a light ray in the ultraviolet to infrared region having a wavelength of 200 nm to 1000 ⁇ m, more preferably a light ray having a wavelength of 250 to 2500 nm, and a wavelength of 700 to 1200 nm.
- the light in the near infrared region is more preferable.
- an infrared shielding film will be described as a typical example of the light reflecting film, but the present invention is not limited thereto.
- the infrared shielding film is formed by laminating an infrared reflection layer including a high refractive index layer and a low refractive index layer, a resin adhesive layer, and a hard coat layer in this order on a substrate.
- the infrared reflective layer may be provided on both surfaces of the substrate.
- the thickness of the infrared shielding film of this embodiment is preferably 12 to 315 ⁇ m, more preferably 15 to 200 ⁇ m, and further preferably 20 to 100 ⁇ m.
- the transmittance in the visible light region shown in JIS R3106-1998 is 50% or more, preferably 75% or more, more preferably 85% or more,
- the region having a wavelength of 900 nm to 1400 nm has a region with a reflectance exceeding 50%.
- the base material used for the infrared shielding film is not particularly limited as long as it is transparent.
- a substrate include methacrylic acid ester, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polyarylate, polystyrene (PS), aromatic polyamide, polyether ether ketone, polysulfone.
- a film made of a resin such as polyethersulfone, polyimide, or polyetherimide, and a resin film obtained by laminating two or more layers of the resin. From the viewpoint of cost and availability, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polycarbonate (PC) are preferably used.
- the thickness of the substrate is preferably 5 to 200 ⁇ m, more preferably 15 to 150 ⁇ m.
- a base material is laminated
- the visible light transmittance of the substrate is preferably 85% or more, and more preferably 90% or more. It is preferable from the viewpoint that the visible light transmittance of the infrared shielding film is 50% or more when the visible light transmittance of the substrate is 85% or more.
- the “visible light transmittance” means the transmittance in the visible light region indicated by JIS R3106-1998.
- the substrate may be an unstretched film or a stretched film, but is preferably a stretched film from the viewpoint of improving strength and suppressing thermal expansion.
- the base material is provided with an undercoat layer on one side or both sides during the film forming process.
- the undercoat layer can be formed in-line or after film formation.
- Examples of the method for forming the undercoat layer include a method of applying an undercoat layer coating solution and drying the obtained coating film.
- the undercoat layer coating solution usually contains a resin.
- the resin include polyester resin, acrylic modified polyester resin, polyurethane resin, acrylic resin, vinyl resin, vinylidene chloride resin, polyethyleneimine vinylidene resin, polyethyleneimine resin, polyvinyl alcohol resin, modified polyvinyl alcohol resin, and gelatin. Etc. A known additive may be further added to the undercoat layer coating solution.
- the coating amount of the undercoat layer coating solution is preferably applied so as to be about 0.01 to 2 g / m 2 in a dry state.
- the coating method of the undercoat layer coating solution is not particularly limited, and known methods such as a roll coating method, a gravure coating method, a knife coating method, a dip coating method, and a spray coating method can be used.
- the obtained coating film may be stretched, and usually an undercoat layer can be formed by drying at 80 to 120 ° C. while performing lateral stretching in a tenter after coating the coating solution.
- the undercoat layer may have a single layer structure or a laminated structure.
- the substrate according to the present invention further includes known functional layers such as a conductive layer, an antistatic layer, a gas barrier layer, an antifouling layer, a deodorant layer, a droplet layer, a slippery layer, an abrasion resistant layer, an interlayer film layer, and the like. You may have.
- the total film thickness of the base material and the intermediate layer is preferably 5 to 200 ⁇ m, more preferably 15 to 150 ⁇ m. preferable.
- the infrared reflective layer includes a high refractive index layer and a low refractive index layer.
- the infrared reflective layer may have any structure including at least one laminate (unit) composed of a high refractive index layer and a low refractive index layer. It is preferable that a plurality of layers and low refractive index layers are alternately stacked.
- the uppermost layer and the lowermost layer of the infrared reflection layer may be either a high refractive index layer or a low refractive index layer, but it is preferable that both the uppermost layer and the lowermost layer are low refractive index layers. This is because when the uppermost layer is a low refractive index layer, the coating property is improved, and when the lowermost layer is a low refractive index layer, the adhesion is improved.
- an arbitrary refractive index layer of the infrared reflection layer is a high refractive index layer or a low refractive index layer is determined by comparing the refractive index with an adjacent refractive index layer. Specifically, when a refractive index layer is used as a reference layer, if the refractive index layer adjacent to the reference layer has a lower refractive index than the reference layer, the reference layer is a high refractive index layer (the adjacent layer is a low refractive index layer). It is judged to be a rate layer.
- the refractive index of the adjacent layer is higher than that of the reference layer, it is determined that the reference layer is a low refractive index layer (the adjacent layer is a high refractive index layer). Therefore, whether the refractive index layer is a high refractive index layer or a low refractive index layer is a relative one determined by the relationship with the refractive index of the adjacent layer. Depending on the relationship, it can be a high refractive index layer or a low refractive index layer.
- high refractive index layer component there are two components constituting the high refractive index layer (hereinafter also referred to as “high refractive index layer component”) and components constituting the low refractive index layer (hereinafter also referred to as “low refractive index layer component”).
- a layer (mixed layer) that is mixed at the interface of the layers and includes a high refractive index layer component and a low refractive index layer component may be formed.
- a set of portions where the high refractive index layer component is 50% by mass or more is defined as a high refractive index layer
- a set of portions where the low refractive index layer component exceeds 50% by mass is defined as a low refractive index layer.
- the concentration profile of the metal oxide particles in the film thickness direction in these laminated films can determine whether the mixed layer that can be formed is a high refractive index layer or a low refractive index layer.
- the concentration profile of the metal oxide particles in the laminated film is sputtered at a rate of 0.5 nm / min using the XPS surface analyzer, etching from the surface to the depth direction, with the outermost surface being 0 nm. It can be observed by measuring the atomic composition ratio.
- each layer etched by sputtering can be converted into a high refractive index layer or a low refractive index layer. It can be regarded as a refractive index layer.
- the XPS surface analyzer is not particularly limited, and any model can be used, but ESCALAB-200R manufactured by VG Scientific Fix Co. was 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 difference in refractive index between the adjacent low refractive index layer and high refractive index layer is 0.1 or more.
- it is 0.3 or more, more preferably 0.35 or more, and particularly preferably more than 0.4.
- the refractive index difference between the high refractive index layer and the low refractive index layer in all the laminates (units) is It is preferable that it exists in the said suitable range.
- the refractive index layer constituting the uppermost layer or the lowermost layer of the infrared reflection layer may be configured outside the above-described preferred range.
- the number of the refractive index layers of the infrared reflective layer (units of the high refractive index layer and the low refractive index layer) is preferably 100 layers or less, that is, 50 units or less, and 40 layers (20 Unit) or less, more preferably 20 layers (10 units) or less.
- refractive index layer high refractive index layer and low refractive index layer
- refractive index layer high refractive index layer and low refractive index layer
- Examples of a method for forming a refractive index layer formed by resin extrusion include a method in which a molten resin obtained by melting a resin is extruded onto a casting drum from a multilayer extrusion die and then rapidly cooled. At this time, after extruding and cooling the molten resin, the resin sheet may be stretched.
- the stretching ratio of the resin can be appropriately selected according to the resin, but is preferably 2 to 10 times in the vertical axis direction and the horizontal axis direction.
- the resin is not particularly limited as long as it is a thermoplastic resin.
- a thermoplastic resin for example, polyalkylene resins, polyester resins, polycarbonate resins, (meth) acrylic resins, amide resins, silicone resins, fluorine resins, etc. Is mentioned.
- polyalkylene resin examples include polyethylene (PE) and polypropylene (PP).
- polyester resin examples include polyester resins having a dicarboxylic acid component and a diol component as main components.
- the dicarboxylic acid component includes terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, diphenylsulfone dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenylethanedicarboxylic acid, cyclohexane.
- Examples include dicarboxylic acid, diphenyldicarboxylic acid, diphenylthioether dicarboxylic acid, diphenylketone dicarboxylic acid, and phenylindane dicarboxylic acid.
- the diol component include ethylene glycol, propylene glycol, tetramethylene glycol, 1,4-butanediol, cyclohexanedimethanol, 2,2-bis (4-hydroxyphenyl) propane, and 2,2-bis (4- Hydroxyethoxyphenyl) propane, bis (4-hydroxyphenyl) sulfone, bisphenol fluorange hydroxyethyl ether, diethylene glycol, neopentyl glycol, hydroquinone, cyclohexanediol and the like.
- PET polyethylene terephthalate
- PBT polybutylene terephthalate
- polycarbonate resin examples include a reaction product of bisphenol A or its derivative bisphenol and phosgene or phenyl dicarbonate.
- Examples of the (meth) acrylic resin include acrylic acid, methacrylic acid, acrylonitrile, methacrylonitrile, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and (meth) acrylic acid-2.
- amide resin examples include aliphatic amide resins such as 6,6-nylon, 6-nylon, 11-nylon, 12-nylon, 4,6-nylon, 6,10-nylon, and 6,12-nylon;
- aromatic polyamide such as an aromatic diamine such as phenylenediamine and an aromatic dicarboxylic acid such as terephthaloyl chloride or isophthaloyl chloride or a derivative thereof may be used.
- silicone resin examples include resins containing a siloxane bond having an organic group such as an alkyl group or an aromatic group as a structural unit.
- the alkyl group is not particularly limited, and examples thereof include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an iobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, and a hexyl group.
- the aromatic group is not particularly limited, and examples thereof include a phenyl group, a tolyl group, a xylyl group, and a benzyl group.
- those having a methyl group and / or a phenyl group are preferable, and dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, and modified products thereof are more preferable.
- fluororesin examples include homopolymers or copolymers such as tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene, vinylidene fluoride, vinyl fluoride, and perfluoroalkyl vinyl ether.
- the above-described resins may be used alone or in combination of two or more.
- the material combination of the high refractive index layer and the low refractive index layer include PEN-polymethyl methacrylate (PMMA), PET-PEN and the like.
- the refractive index layer can be formed by a method of sequentially applying and drying a coating solution, a method of applying and drying a coating solution in multiple layers, or the like.
- the refractive index layer thus formed usually contains a water-soluble resin.
- Other metal oxide particles, a protective agent, a curing agent, and other additives may be further included as necessary.
- Water-soluble resin is not particularly limited, but polyvinyl alcohol resins, gelatin, celluloses, thickening polysaccharides, and polymers having reactive functional groups can be used. Of these, it is preferable to use a polyvinyl alcohol-based resin.
- water-soluble means a compound in which 1% by mass or more, preferably 3% by mass or more dissolves in an aqueous medium.
- Polyvinyl alcohol resins preferably used in the present invention include, in addition to ordinary polyvinyl alcohol obtained by hydrolyzing polyvinyl acetate (unmodified polyvinyl alcohol), cation-modified polyvinyl alcohol having a terminal cation-modified, anionic group Also included are anion-modified polyvinyl alcohol having a modified nature, modified polyvinyl alcohol modified with acrylic, reactive polyvinyl alcohol (for example, “Gosefimer Z” manufactured by Nippon Gosei Co., Ltd.), and vinyl acetate resin (for example, “Exeval” manufactured by Kuraray). . These polyvinyl alcohol resins can be used in combination of two or more, such as the degree of polymerization and the type of modification. Further, silanol-modified polyvinyl alcohol having a silanol group (for example, “R-1130” manufactured by Kuraray Co., Ltd.) can be used in combination.
- 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, for example, JP-A-61-110483. It is obtained by saponifying a copolymer of an ethylenically unsaturated monomer having a cationic group and 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.
- the block copolymer of the vinyl compound and vinyl alcohol which have the described hydrophobic group is mentioned.
- Polyvinyl alcohol can be used in combination of two or more, such as the degree of polymerization and the type of modification.
- vinyl acetate resins examples include Exeval (trade name: manufactured by Kuraray Co., Ltd.) and Nichigo G polymer (trade name: manufactured by Nippon Synthetic Chemical Industry Co., Ltd.).
- the polymerization degree of the polyvinyl alcohol resin is preferably 1500 to 7000, more preferably 2000 to 5000.
- a polymerization degree of 1500 or more is preferable because crack resistance of the coating film during formation of the refractive index layer is improved.
- the degree of polymerization is 7000 or less, the coating liquid at the time of forming the refractive index layer is preferable.
- degree of polymerization refers to the viscosity average degree of polymerization, and a value measured according to JIS-K6726 (1994) is adopted. Specifically, after the polyvinyl alcohol-based resin is completely re-saponified and purified, the intrinsic viscosity [ ⁇ ] (dl / g) measured in water at 30 ° C. can be obtained by the following formula.
- P represents the degree of polymerization
- ⁇ represents the intrinsic viscosity
- the high refractive index layer and the low refractive index layer constituting the infrared reflective layer contain polyvinyl alcohol resins having different saponification degrees. This is preferable because mixing at the interface is suppressed, the infrared reflectance (infrared shielding rate) becomes better, and the haze becomes lower.
- the value of the saponification degree of either the high refractive index layer or the low refractive index layer may be high, but the saponification degree of the polyvinyl alcohol resin contained in the high refractive index layer is higher. It is preferable.
- the polyvinyl alcohol resin having a high degree of saponification can protect the metal oxide particles.
- the difference in the absolute value of the saponification degree of the polyvinyl alcohol resin contained in the high refractive index layer and the low refractive index layer is preferably 3 mol% or more, and more preferably 5 mol% or more. It is preferable that the difference in the absolute value of the saponification degree is 3 mol% or more because the intermixed state of the high refractive index layer and the low refractive index layer is set to a preferable level.
- the difference in absolute value of the saponification degree is preferably as large as possible, but from the viewpoint of solubility of polyvinyl alcohol in water, the difference in absolute value of the saponification degree is preferably 20 mol% or less. .
- the saponification degree of the polyvinyl alcohol resin contained in the high refractive index layer and the low refractive index layer is preferably 75 mol% or more from the viewpoint of solubility in water.
- the saponification degree of the polyvinyl alcohol resin contained in the high refractive index layer and the low refractive index layer is 90 mol% or more for one refractive index layer and 90 mol% for the other refractive index layer.
- the saponification of one refractive index layer is preferably 90 mol% or less, and the saponification degree of the refractive index layer is more preferably 95 mol% or more.
- the saponification degree of the polyvinyl alcohol resin contained in the low refractive index layer is more preferably 90 mol% or less, and the saponification degree of the polyvinyl alcohol resin contained in the high refractive index layer is more preferably 95 mol% or more.
- the saponification degree of the polyvinyl alcohol resin of the low refractive index layer and the high refractive index layer is in the above relationship, it is preferable because the interlayer mixing state of the high refractive index layer and the low refractive index layer can be set to a preferable level.
- the upper limit of the degree of saponification of the polyvinyl alcohol-based resin is not particularly limited, but is usually less than 100 mol%, preferably 99.9 mol% or less.
- the content of the polyvinyl alcohol resin is preferably 5 to 50% by mass with respect to 100% by mass of the total mass (solid content) of each refractive index layer. More preferably, it is -40% by mass, and further more preferably 14-30% by mass.
- the content of the polyvinyl alcohol resin is 5% by mass or more, the film surface becomes uniform and the transparency can be improved when the coating film formed during the formation of the refractive index layer is dried.
- film surface (also referred to as “surface”) means the surface of a coating film obtained at the time of forming the refractive index layer.
- all polyvinyl alcohol-based resin means the total amount of polyvinyl alcohol-based resin contained in each refractive index layer.
- Gelatin Gelatin that can be used includes various types of gelatin that have been widely used in the field of silver halide photographic materials. More specifically, acid-treated gelatin, alkali-treated gelatin, enzyme-treated gelatin, and derivatives thereof can be mentioned.
- the cellulose that can be used is not particularly limited, but a water-soluble cellulose derivative can be preferably used.
- the water-soluble cellulose derivative include water-soluble cellulose derivatives such as carboxymethyl cellulose (cellulose carboxymethyl ether), methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose; carboxymethyl cellulose (cellulose that is a carboxylic acid group-containing cellulose) Carboxymethyl ether) and carboxyethyl cellulose.
- the thickening polysaccharides that can be used are not particularly limited and include generally known natural simple polysaccharides, natural complex polysaccharides, synthetic simple polysaccharides, and synthetic complex polysaccharides.
- pectin, galactan eg, agarose, agaropectin, etc.
- galactomannoglycan eg, locust bean gum, guaran, etc.
- xyloglucan eg, tamarind gum, tamarind seed 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.
- gellan gum glycosaminoglycans (for example, h
- Polymers having reactive functional groups include polyvinyl pyrrolidones, polyacrylic acid, acrylic acid-acrylonitrile copolymer, potassium acrylate-acrylonitrile copolymer, vinyl acetate-acrylic.
- Acrylic resin such as acid ester copolymer, acrylic acid-acrylic acid ester copolymer, styrene-acrylic acid copolymer, styrene-methacrylic acid copolymer, styrene-methacrylic acid-acrylic acid ester copolymer, styrene- Styrene acrylic resin such as ⁇ -methylstyrene-acrylic acid copolymer, styrene- ⁇ -methylstyrene-acrylic acid-acrylic acid ester copolymer, styrene-sodium styrenesulfonic acid copolymer, styrene-2-hydroxyethyl Acrylate copolymer Styrene-2-hydroxyethyl acrylate-potassium styrene sulfonate copolymer, styrene-maleic acid copolymer, styrene-maleic anhydride copolymer
- the above water-soluble resins may be used alone or in combination of two or more.
- Metal oxide particles are an optional component that can be contained in the refractive index layer. By including metal oxide particles, the refractive index difference between the low refractive index layer and the high refractive index layer can be increased.
- first metal oxide particles first metal oxide particles
- second metal oxide particles typical metal oxide particles that can be contained as a high refractive index layer
- the first metal oxide particles are not particularly limited, and examples thereof include silicon dioxide such as zinc oxide, synthetic amorphous silica, and colloidal silica, alumina, and colloidal alumina. Of these, silicon dioxide is preferably used, and colloidal silica is particularly preferably used.
- the first metal oxide may be used alone or in combination of two or more.
- Colloidal silica is obtained by heating and aging a silica sol obtained by metathesis using sodium silicate acid or the like or passing through an ion exchange resin layer.
- colloidal silica a synthetic product or a commercially available product may be used.
- commercially available products include Snowtex series (Snowtex OS, OXS, S, OS, 20, 30, 40, O, N, C, manufactured by Nissan Chemical Industries, Ltd.).
- the surface of the colloidal silica may be cation-modified, or may be treated with Al, Ca, Mg, Ba or the like.
- the average particle diameter of the first metal oxide particles is preferably 3 to 100 nm, more preferably 3 to 50 nm.
- the “average particle diameter (number average)” of the metal oxide particles means that the particles themselves or any 1,000 particles appearing on the cross section or surface of the refractive index layer are observed with an electron microscope. Then, the particle diameter is measured, and the value obtained as the simple average value (number average) is adopted. At this time, the particle diameter of the particle is expressed by a diameter assuming a circle equal to the projected area.
- the content of the first metal oxide particles in the low refractive index layer is preferably 20 to 75% by mass, and preferably 30 to 70% by mass with respect to 100% by mass of the total solid content of the low refractive index layer. More preferably, it is more preferably 35 to 69% by mass, and particularly preferably 40 to 68% by mass. It is preferable that the content of the first metal oxide particles is 20% by mass or more because a desired refractive index can be obtained. On the other hand, when the content of the first metal oxide particles is 75% by mass or less, the coating property of the coating solution that can be used when forming the low refractive index layer can be improved.
- the second metal oxide particles are not particularly limited, but are preferably different from the first metal oxide particles.
- Specific examples include titanium oxide, zirconium oxide, zinc oxide, alumina, colloidal alumina, niobium oxide, and europium oxide.
- titanium oxide or zirconium oxide it is preferable to use titanium oxide or zirconium oxide, and more preferably to contain rutile (tetragonal) titanium oxide particles.
- rutile (tetragonal) titanium oxide particles may be used independently, or 2 or more types may be mixed and used for it.
- the titanium oxide is preferably a titanium oxide sol whose surface is modified so that it can be dispersed in water or an organic solvent.
- Examples of the preparation method of the aqueous titanium oxide sol include, for example, JP-A-63-17221, JP-A-7-819, JP-A-9-165218, JP-A-11-43327, JP-A-63-3. Reference can be made to the matters described in Japanese Patent No. 17221.
- step (2) is a step of treating titanium oxide hydrate with at least one basic compound selected from the group consisting of alkali metal hydroxides or alkaline earth metal hydroxides. After (1), it comprises a step (2) of treating the obtained titanium oxide dispersion with a carboxylic acid group-containing compound and an inorganic acid.
- the titanium oxide particles may be in the form of core-shell particles coated with a silicon-containing hydrated oxide.
- the core-shell particles have a structure in which the surface of the titanium oxide particles is coated with a shell made of a silicon-containing hydrated oxide on a titanium oxide serving as a core.
- the volume average particle size of the titanium oxide particles serving as the core portion is preferably more than 1 nm and less than 30 nm, and more preferably 4 nm or more and less than 30 nm.
- the silicon-containing hydrated oxide may be any of a hydrate of an inorganic silicon compound, a hydrolyzate and / or a condensate of an organic silicon compound, but preferably has a silanol group. Therefore, the core-shell particles are preferably silica-modified (silanol-modified) titanium oxide particles in which titanium oxide particles are silica-modified.
- the coating amount of the silicon-containing hydrated compound of titanium oxide is preferably 3 to 30% by mass, more preferably 3 to 10% by mass with respect to 100% by mass of titanium oxide. % Is more preferable. A coating amount of 3% or more is preferable because the core-shell particles can be formed stably. On the other hand, when the coating amount is 30% by mass or less, it is preferable because the high refractive index layer has a desired refractive index value.
- the second metal oxide particles preferably have an average particle size (number average) of 3 to 100 nm, and more preferably 3 to 50 nm.
- the volume average particle diameter of the second metal oxide particles is preferably 50 nm or less, more preferably 1 to 45 nm, and further preferably 5 to 40 nm.
- a volume average particle size of 50 nm or less is preferable because it has less haze and excellent visible light transmittance.
- the “volume average particle diameter” means the volume average particle diameter of primary particles or secondary particles dispersed in a medium.
- the volume average particle diameter a value measured by the following method is adopted. Specifically, arbitrary 1000 particles appearing on the cross section or surface of the refractive index layer are observed with an electron microscope to measure the particle size, and particles having particle sizes of d1, d2,. In the group of n1, n2... Ni... Nk metal oxide particles, where the volume per particle is vi, the volume average particle diameter is calculated by the following formula.
- the content of the second metal oxide particles is preferably 15 to 85% by mass and more preferably 20 to 80% by mass with respect to 100% by mass of the total solid content of the high refractive index layer. More preferably, the content is 30 to 75% by mass. By setting it as the said range, it can be set as the favorable infrared shielding property.
- the first metal oxide particles and the second metal oxide particles are preferably monodispersed.
- “monodisperse” means that the monodispersity obtained by the following formula is 40% or less, more preferably 30% or less, and particularly preferably 0.1 to 20%. It is.
- the first metal oxide particles and the second metal oxide particles are in an ionic state (that is, the charges have the same sign).
- the ionicity is the same, formation of aggregates at the interface can be prevented, and good haze can be obtained.
- aligning ionicity for example, when silicon dioxide (anion) is used for the low refractive index layer and titanium oxide (cation) is used for the high refractive index layer, the silicon dioxide is treated with aluminum or the like to be cationized.
- titanium oxide is treated with a silicon-containing hydrated oxide to be anionized.
- the refractive index layer preferably contains a water-soluble resin that coats (protects) the metal oxide particles.
- a water-soluble resin hereinafter also referred to as “protective agent” for coating (protecting) the metal oxide particles will be described.
- the said protective agent has a role for making it easy to disperse
- the protective agent is preferably a polyvinyl alcohol-based resin from the viewpoint of adsorptivity, and more preferably modified polyvinyl alcohol from the viewpoint of transparency and stabilization.
- the degree of polymerization of the protective agent is preferably 100 to 700, and more preferably 200 to 500.
- the degree of polymerization is in the above range, the metal oxide particles can be stabilized, which is preferable.
- the degree of saponification is preferably 95% mol or more from the viewpoint of adsorptivity to metal oxide particles, and is 98 to 99.5 mol%. Is more preferable.
- the content of the protective agent in the refractive index layer is preferably 0.1 to 30% by mass, and 0.5 to 20% by mass with respect to 100% by mass of the metal oxide particles. Is more preferably 1 to 10% by mass. It is preferable for the content of the protective agent to be in the above range since the liquid stability of the coating liquid that can be used when forming the refractive index layer is excellent and the coating property is stable.
- the refractive index layer may further contain a curing agent.
- the curing agent can react with a water-soluble resin (preferably a polyvinyl alcohol resin) contained in the refractive index layer to form a hydrogen bond network.
- the curing agent that can be used together with the polyvinyl alcohol-based resin is not particularly limited as long as it causes a curing reaction with the polyvinyl alcohol-based resin, and examples thereof include boric acid, borate, and borax.
- Boric acid or borate refers to oxyacids and salts thereof having a boron atom as a central atom. Specifically, orthoboric acid, diboric acid, metaboric acid, tetraboric acid, pentaboric acid, octaboric acid, Examples include boric acid and salts thereof.
- Borax is a mineral represented by Na 2 B 4 O 5 (OH) 4 ⁇ 8H 2 O (sodium tetraborate (Na 2 B 4 O 7 ) decahydrate).
- Boric acid, borate, and borax can be used usually by adding them in the form of an aqueous solution to a coating solution that can be used when forming the refractive index layer.
- the compound which has a functional group which can react with a polyvinyl alcohol-type resin and the compound which accelerates
- Specific examples include diglycidyl ethyl ether, ethylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-diglycidylcyclohexane, N, N-diglycidyl-4-glycidyloxyaniline, sorbitol polyglycidyl ether.
- Epoxy curing agents such as glycerol polyglycidyl ether; aldehyde curing agents such as formaldehyde and glyoxal; active halogen curing agents such as 2,4-dichloro-4-hydroxy-1,3,5, -s-triazine; Active vinyl compounds such as 1,3,5-trisacryloyl-hexahydro-s-triazine, bisvinylsulfonylmethyl ether; aluminum alum, titanium-based crosslinking agent (TC-300; manufactured by Matsumoto Fine Chemical Co., Ltd.), zirconium-based Bridges agent (ZIRCOSOL AC-20, ZIRCOSOL ZA-30; manufactured by Daiichi Kigenso Ltd., etc.) and the like.
- boric acid and its salt and / or borax it is preferable to use boric acid and its salt and / or borax in the present invention.
- boric acid and its salt and / or borax are used, the metal oxide particles and the hydroxy group of the polyvinyl alcohol resin can form a hydrogen bond network. As a result, interlayer mixing between the high refractive index layer and the low refractive index layer is suppressed, and preferable infrared shielding characteristics can be achieved.
- the film surface temperature of the coating film is once cooled to about 15 ° C., and then the film surface is dried.
- the above effect can be expressed more preferably.
- the content of the curing agent is preferably 1 to 600 mg, more preferably 100 to 600 mg, per 1 g of water-soluble resin (preferably polyvinyl alcohol resin).
- the refractive index layer may further contain various additives as necessary.
- optical brighteners For example, optical brighteners; pH adjusters such as sulfuric acid, phosphoric acid, acetic acid, citric acid, sodium hydroxide, potassium hydroxide, potassium carbonate; antifoaming agents; lubricants such as diethylene glycol; antiseptics; antistatic agents; Matting agents and the like can be mentioned.
- the refractive index layer is preferably a refractive index layer formed by using a wet film forming method.
- the refractive index layer includes a water-soluble resin.
- the refractive index including a water-soluble resin and metal oxide particles (first metal oxide particles or second metal oxide particles) is more preferable. More preferably, it is a layer.
- the refractive index layer is a high refractive index layer or a low refractive index layer is a relative one determined by the relationship with the adjacent refractive index layer, but the refractive index of the low refractive index layer.
- (NL) is preferably 1.10 to 1.60, and more preferably 1.30 to 1.50.
- the refractive index (nH) of the high refractive index layer is preferably 1.80 to 2.50, more preferably 1.90 to 2.20.
- a sample is prepared by cutting a coating film obtained by applying a refractive index layer to be measured as a single layer on a support to a size of 10 cm ⁇ 10 cm.
- a surface (back surface) opposite to the measurement surface is roughened, and light absorption processing is performed with a black spray.
- the sample thus prepared was measured for 25 points of reflectance in the visible region (400 nm to 700 nm) under the condition of regular reflection at 5 degrees. An average value is obtained, and an average refractive index is obtained from the measurement result.
- 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 an infrared reflectance of 90% or more, if the refractive index difference is smaller than 0.1, it is necessary to stack 200 layers or more. In such a case, productivity may decrease, scattering at the laminated interface increases, transparency may decrease, and manufacturing failures may occur. From the standpoint of improving reflectivity and reducing the number of layers, there is no upper limit to the difference in refractive index.
- the thickness per layer of the low refractive index layer constituting the infrared reflective layer is preferably 20 to 800 nm, and more preferably 50 to 350 nm.
- the thickness per layer of the high refractive index layer is preferably 20 to 800 nm, and more preferably 50 to 350 nm.
- the infrared reflective layer may be provided on only one side of the substrate or on both sides of the substrate, but is preferably provided on both sides of the substrate.
- the number of laminated refractive index layers in the infrared reflective layer may increase in some cases.
- curling may occur in the infrared reflective layer.
- a preferred embodiment of the present embodiment is an infrared shielding film in which an infrared reflection layer, a substrate, an infrared reflection layer, a resin adhesive layer, and a hard coat layer are arranged in this order.
- the resin adhesive layer has a function of improving the adhesion between the infrared reflective layer and the hard coat layer.
- the resin adhesive layer includes at least one selected from the group consisting of polyvinyl acetal resins, acrylic resins, and urethane resins.
- the thickness of the resin adhesive layer is preferably 0.3 to 3 ⁇ m, and more preferably 0.5 to 2 ⁇ m.
- the polyvinyl acetal resin is a resin obtained by acetalization by reacting at least one hydroxyl group of polyvinyl alcohol with an aldehyde.
- Specific examples of the polyvinyl acetal resin include polyvinyl alcohol such as polyvinyl formal and polyvinyl butyral; partially formalized polyvinyl alcohol such as partially formalized polyvinyl butyral; and copolymer acetal such as polyvinyl butyral acetal. These polyvinyl acetal resins may contain other repeating units.
- polyvinyl acetal resins may be prepared by themselves or commercially available.
- a known method is used. Examples of the known method include a method of reacting polyvinyl alcohol with an aldehyde in the presence of an acid catalyst such as hydrochloric acid or sulfuric acid.
- Examples of commercially available products include Denkabutyral # 2000L, # 3000-1, # 3000-K, # 4000-1, # 5000-A, # 6000-C, Denka Formal # 20, # 100, # 200 ( Manufactured by Denki Kagaku Kogyo Co., Ltd.), S-REC B Series BL-1, BL-2, BL-S, BM-1, BM-2, BH-1, BX-1, BX-10, BL-1, BL-SH , BX-L, ESREC K series KS-10, ESREC KW series KW-1, KW-3, KW-10, ESREC KX series KX-1, KX-5 (manufactured by Sekisui Chemical Co., Ltd.).
- the acetalization rate of the polyvinyl acetal resin is preferably 5 to 65 mol%, and more preferably 15 to 50 mol% from the viewpoint of water solubility and adhesiveness. It is preferable for the acetalization rate to be 5 mol% or more because adhesion with the hard coat layer can be improved. On the other hand, an acetalization rate of 65 mol% or less is preferable because the effect of adhesion to the infrared reflective layer can be improved. In addition, when polyvinyl acetal resin is mixed, the average value of the acetalization rate calculated in consideration of the amount to be mixed shall be adopted.
- the acetalization rate can be controlled by appropriately adjusting the kind of polyvinyl alcohol, aldehyde, catalyst, the amount added, the reaction temperature, and the like. In general, the higher the value of the acetalization rate, the more it tends to dissolve in water.
- An acrylic resin is a resin containing an acrylic monomer as a constituent component of a polymer.
- the acrylic monomer is not particularly limited, but acrylic acid, methacrylic acid, acrylamide, methacrylamide, acrylic ester, methacrylic ester, amino group-substituted alkyl acrylate, amino group-substituted alkyl methacrylate, epoxy group-containing acrylate, substituted acrylamide , Substituted methacrylamide, salts of acrylic acid, salts of methacrylic acid and the like.
- acrylic ester examples include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, and phenylethyl Examples thereof include alkyl acrylates such as acrylates; hydroxy-containing alkyl acrylates such as 2-hydroxyethyl acrylate and 2-hydroxypropyl acrylate.
- methacrylic acid ester examples include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, and phenylethyl.
- alkyl methacrylates such as methacrylate
- hydroxy-containing alkyl methacrylates such as 2-hydroxyethyl methacrylate and 2-hydroxypropyl methacrylate.
- the above acrylic monomers may be used alone or in combination of two or more.
- an aqueous resin is preferably used from the viewpoint of applicability, an acrylic aqueous solution or an acrylic emulsion is preferably used, and an acrylic aqueous solution is more preferably used from the viewpoint of transparency.
- the acrylic resin is preferably modified from the viewpoint of water solubility.
- acrylic emulsions are commercially available. From the viewpoint of film forming property, Tg is preferably 20 ° C. or less, and from the viewpoint of transparency, the particle size is preferably 100 nm or less.
- a urethane resin is a resin formed via a urethane bond.
- the urethane resin it is preferable to use a hydrophilic polyurethane resin having a sulfonic acid alkali base or a carboxylic acid amine base.
- the hydrophilic polyurethane resin include polyethylene glycol-diphenylmethane diisocyanate-ethylenediamine, dimethylolpropionic acid amine salt-based polyurethane, and the like.
- an aqueous resin is preferably used from the viewpoint of applicability, and a urethane emulsion is preferably used.
- a urethane emulsion is preferably used.
- Tg is preferably 20 ° C. or less, and from the viewpoint of transparency, the particle size is preferably 100 nm or less.
- polyvinyl acetal resin acrylic resin, and urethane resin may be used alone or in combination of two or more.
- the resin adhesive layer contains at least one selected from the group consisting of the polyvinyl acetal resin, the acrylic resin, and the urethane resin
- the adhesion with the above-described infrared reflective layer and the hard coat layer described later is improved.
- the reason why such adhesion is improved is not clear, but it is presumed that the adhesion is improved by the following mechanism.
- the hydrophilic group contained in the resin constituting the resin adhesive layer contributes to the improvement of adhesion.
- the hydrophilic group interacts with a hydrophilic group contained in a component (for example, a water-soluble resin) included in the refractive index layer constituting the infrared reflective layer by a hydrogen bond, a covalent bond, a coordinate bond, or the like. It is considered that this contributes to improvement of adhesion with the infrared reflection layer.
- a component for example, a water-soluble resin
- the hydrophilic group is not particularly limited, and examples thereof include a hydroxyl group, amino group, carboxy group, carbonyl group, thio group, sulfo group, and phosphate group.
- the hydrophobicity of the resin constituting the resin adhesive layer is considered to contribute.
- the hard coat layer is highly hydrophobic as will be described later, by forming a resin adhesive layer on the hydrophobic resin, elution of at least a part of the hard coat layer into the resin, Intermolecular interaction such as strong van der Waals force is generated, which is considered to contribute to the improvement of adhesion with the hard coat layer.
- Such a mechanism is based on the fact that almost no improvement in adhesion between the infrared reflective layer and the hard coat layer can be obtained when unmodified polyvinyl alcohol containing no hydrophobic group is used for the resin adhesive layer. Is also supported.
- the above-mentioned resin satisfies the balance between hydrophilicity and hydrophobicity, it is considered that the adhesion between the infrared reflection layer and the hard coat layer can be improved.
- the above-described mechanism is merely an estimate, and even if the above-described improvement in adhesion is obtained by a different mechanism, it is included in the technical idea of the present invention.
- the resin adhesive layer may further include metal oxide particles as necessary.
- the metal oxide particles that can be used are not particularly limited, and the first metal oxide particles and the second metal oxide particles described above may be used. Of these, silicon dioxide and alumina are preferably used from the viewpoints of adhesion and transparency.
- the particle size of the metal oxide particles contained in the resin adhesive layer is preferably 100 nm or less, and more preferably 3 to 30 nm. It is preferable that the particle size is 100 nm or less because of excellent transparency.
- the content of the metal oxide particles in the resin adhesive layer is preferably 3 to 30% by mass and more preferably 5 to 25% by mass with respect to 100% by mass of the total solid content of the resin adhesive layer. .
- the resin adhesive layer Since the resin adhesive layer has a hydrophilic group, it may be eluted in the infrared reflection layer in the manufacturing process or storage environment. As a result, the infrared reflectance may be affected.
- the elution can be suppressed by including metal oxide particles in the resin adhesive layer.
- metal oxide particles in the resin adhesive layer swelling of the resin can be suppressed, and durability can be improved.
- an infrared shielding film that is exposed to a severe environment such as the inside of a car during the day is required to have high durability, and improvement in durability by including metal oxide particles in the resin adhesive layer is Very effective.
- the resin adhesive layer may further contain a zirconium compound as necessary. Adhesion can be improved by containing a zirconium compound.
- the zirconium compound that can be used is not particularly limited, but is preferably an aqueous system.
- Specific zirconium compounds zirconium chloride ZrOCl 2, ZrO (OH) Cl , zirconium oxynitrate ZrO (NO 3) 2, ammonium zirconium carbonate: (NH 4) 2 Zr ( OH) 2 (CO 3) 2, Examples include zirconium acetate ZrO (C 2 H 3 O 2 ) 2 .
- a commercial item may be used for the zirconium compound.
- the resin adhesive layer preferably further contains heat ray absorbing particles.
- the heat ray absorbing particles are preferably metal oxide particles, and examples thereof include tin oxide, zinc oxide, titanium oxide, tungsten oxide, and indium oxide. Specific examples of the particles include aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide (ATO) particles, gallium-doped zinc oxide (GZO) particles, indium-doped zinc oxide (IZO) particles, and aluminum-doped zinc oxide.
- ATO antimony-doped tin oxide
- GZO gallium-doped zinc oxide
- IZO indium-doped zinc oxide
- AZO niobium doped titanium oxide particles
- sodium doped tungsten oxide particles sodium doped tungsten oxide particles
- cesium doped tungsten oxide particles cesium doped tungsten oxide particles
- thallium doped tungsten oxide particles rubidium doped tungsten oxide particles
- tin doped indium oxide (ITO) particles tin doped zinc oxide particles
- Examples thereof include silicon-doped zinc oxide particles.
- the heat ray absorbing particles are selected from the group consisting of tin-doped indium oxide particles (ITO), antimony-doped tin oxide particles (ATO), and aluminum-doped zinc oxide particles (AZO). At least one kind is preferable, and aluminum-doped zinc oxide particles are more preferable.
- the volume average particle diameter of the heat ray absorbing particles is not particularly limited, but is preferably 1 to 50 nm, more preferably 2 to 40 nm, and particularly preferably 3 to 30 nm.
- the resin adhesive layer may contain various additives.
- the additive is not particularly limited, and examples thereof include an ultraviolet absorber, a fading inhibitor, a fluorescent brightener, a pH adjuster, an antifoaming agent, a lubricant, an antiseptic, an antistatic agent, and a matting agent.
- the hard coat layer has a function of preventing scratches on the infrared shielding film.
- the hard coat layer includes a hard coat agent. If necessary, other additives may further be included.
- an active energy ray curable resin is used as the hard coating agent.
- the “active energy ray” represents an active ray such as an ultraviolet ray or an electron beam, and preferably means an ultraviolet ray.
- the active energy ray curable resin is not particularly limited, but preferably contains a monomer having an ethylenically unsaturated double bond, more preferably an ultraviolet curable resin.
- the ultraviolet curable resin is not particularly limited, but is an ultraviolet curable urethane (meth) acrylate resin, an ultraviolet curable polyester (meth) acrylate resin, an ultraviolet curable epoxy (meth) acrylate resin, an ultraviolet curable polyol (meth) acrylate. Examples thereof include resins. Among these, it is preferable to use an ultraviolet curable (meth) acrylate resin.
- the ultraviolet curable urethane (meth) acrylate resin is obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and further adding 2-hydroxyethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2 It can be easily obtained by reacting a (meth) acrylate monomer having a hydroxyl group such as hydroxypropyl (meth) acrylate.
- a mixture of 100 parts Unidic 17-806 (manufactured by DIC Corporation) and 1 part of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) described in JP-A-59-151110 is preferably used.
- UV curable polyester (meth) acrylate resin can be easily prepared by reacting 2-hydroxyethyl (meth) acrylate, glycidyl (meth) acrylate, (meth) acrylic acid and other monomers with the hydroxyl group or carboxy group at the end of the polyester. Can be obtained (for example, JP-A-59-151112).
- the ultraviolet curable epoxy (meth) acrylate resin can be obtained by reacting a monomer such as (meth) acrylic acid, (meth) acrylic acid chloride, glycidyl (meth) acrylate with the hydroxyl group at the terminal of the epoxy resin.
- a monomer such as (meth) acrylic acid, (meth) acrylic acid chloride, glycidyl (meth) acrylate
- Unidic V-5500 manufactured by DIC Corporation
- the ultraviolet curable polyol (meth) acrylate resin is not particularly limited, but ethylene glycol (meth) acrylate, polyethylene glycol di (meth) acrylate, glycerin tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol.
- examples include tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and alkyl-modified dipentaerythritol penta (meth) acrylate.
- thermosetting resin is not particularly limited, and examples thereof include inorganic materials such as polysiloxane.
- the above resins may be used alone or in combination of two or more.
- the hard coat agent can be obtained by curing the resin.
- the curing method include heat and active energy ray irradiation, but active energy ray irradiation is preferable from the viewpoint of curing temperature, curing time, cost, and the like.
- the active energy ray-curable resin When the active energy ray-curable resin is irradiated with the active energy ray, the active energy ray-curable resin is cured through a crosslinking reaction or the like, and becomes a hard coating agent.
- a known additive can be used in the hard coat layer as necessary.
- Preferred additives include dyes or pigments that can absorb or reflect infrared rays.
- the thickness of the hard coat is preferably 1 to 10 ⁇ m, and more preferably 2 to 5 ⁇ m.
- the elasticity modulus of an infrared reflective layer (A), a resin contact bonding layer (B), and a hard-coat layer (C) provides the following elastic modulus differences.
- the elastic modulus of the infrared reflective layer can be determined by a conventionally known elastic modulus measurement method. For example, under the condition that a constant strain is applied at a constant frequency (Hz) using Vibron DDV-2 manufactured by Orientec.
- RSA-II manufactured by Rheometrics
- a method of obtaining from a measured value obtained by changing applied strain at a constant frequency it can be measured by a nano indenter to which a nano indentation method is applied, for example, a nano indenter (Nano IndenterTM XP / DCM) manufactured by MTS System.
- the “nanoindentation method” refers to applying an indentation of a triangular pyramid with a tip radius of about 0.1 to 1 ⁇ m to the infrared reflecting layer, which is the object to be measured, with a very small load. After that, the indenter is returned and unloaded, and the obtained load-displacement curve is created, and the elastic modulus (Reduced modulus) is measured from the load and the indentation depth obtained from the load-displacement curve.
- an extremely low load for example, a maximum load of 20 mN and a head assembly with a load resolution of 1 nN can be used to measure the displacement resolution with a high accuracy of 0.01 nm.
- the elastic modulus of the infrared reflective layer (A) should be at least that of the high refractive index layer or the low refractive index layer in contact with the resin adhesive layer is lower than the elastic modulus of the resin adhesive layer (B). .
- the elastic modulus of the resin adhesive layer (B) and the hard coat layer (C) can also be measured by the nanoindentation method in the same manner as the infrared reflective layer (A).
- the method for producing the light reflecting film of the present invention is not particularly limited, and any method can be used as long as a light reflecting layer including a low refractive index layer and a high refractive index layer can be formed on a substrate. Can be.
- the manufacturing method of the light reflecting film will also be described for an infrared shielding film which is a typical example of the light reflecting film, but the present invention is not limited thereto.
- the infrared shielding film is formed by alternately applying a coating solution for a low refractive index layer and a coating solution for a high refractive index layer on a substrate, and drying to form an infrared reflective layer.
- a resin adhesive layer coating solution is applied to the infrared reflective layer and dried to form a resin adhesive layer.
- the hard coating layer coating solution is applied to the resin adhesive layer, dried, and then irradiated with active energy rays. And it can manufacture by forming a hard-coat layer.
- the infrared reflective layer is usually formed by alternately applying and drying a low refractive index layer coating solution and a high refractive index layer coating solution on a substrate.
- the coating solution for the low refractive index layer usually contains a water-soluble resin and a solvent, and if necessary, contains first metal oxide particles, a protective agent, a curing agent, and other additives.
- water-soluble resins first metal oxide particles, protective agents, curing agents, and other additives that can be used can be the same as those described above, description thereof is omitted here.
- the coating solution is stabilized, and as a result, the coating property of the resulting coating film can be improved.
- that the coating solution is stable means that the coating solution is stabilized over time.
- the solvent that can be used is not particularly limited, but is preferably water, an organic solvent, or a mixed solvent thereof.
- Specific 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 glycol monomethyl.
- ethers examples include ethers, ethers such as ethylene glycol monoethyl ether, amides such as dimethylformamide and N-methylpyrrolidone; ketones such as acetone, methyl ethyl ketone, acetylacetone and cyclohexanone.
- solvents may be used alone or in combination of two or more. From the viewpoint of environment and simplicity of operation, the solvent to be used is preferably water or a mixed solvent of water and methanol or ethanol, more preferably 95% or more.
- a polyvinyl alcohol resin is suitably used as the water-soluble resin in the low refractive index layer coating solution.
- it is preferable to use an aqueous solvent.
- An aqueous solvent is preferable from the viewpoint of productivity and from the viewpoint of environmental protection.
- a method for preparing a coating solution for a low refractive index layer that is preferable because it can suppress mixing between layers by setting a coating film after coating is not particularly limited.
- curing agent, and another additive, and the method of stirring and mixing is mentioned.
- the order of addition of the respective components is not particularly limited, and the respective components may be sequentially added and mixed while stirring, or may be added and mixed at one time while stirring. If necessary, it is further adjusted to an appropriate viscosity using a solvent.
- the concentration of the water-soluble resin in the coating solution for the low refractive index layer is preferably 0.5 to 10% by mass.
- the concentration of the metal oxide particles in the coating solution for the low refractive index layer is preferably 1 to 50% by mass.
- the coating solution for a high refractive index layer usually contains a water-soluble resin and a solvent, and if necessary, contains second metal oxide particles, a protective agent, a curing agent, and other additives.
- the water-soluble resin preferably contains modified polyvinyl alcohol.
- the coating liquid for the high refractive index layer can be prepared by the same method as the coating liquid for the low refractive index layer.
- the coating liquid for the high refractive index layer contains the second metal oxide particles
- the second metal oxide particles are more preferably titanium oxide particles coated with a silicon-containing hydrated oxide.
- the dispersion liquid may be appropriately added so as to have an arbitrary concentration in each layer.
- the concentration of the water-soluble resin in the coating solution for the high refractive index layer is preferably 0.5 to 10% by mass.
- the concentration of the metal oxide particles in the coating solution for the high refractive index layer is preferably 1 to 50% by mass.
- An infrared reflective layer can be formed by applying and drying the prepared coating liquid for the low refractive index layer and the coating liquid for the high refractive index layer on the substrate.
- Specific examples include: (1) A high refractive index layer coating solution is applied on a substrate and dried to form a high refractive index layer, and then a low refractive index layer coating solution is applied.
- the method (4) which is a simpler manufacturing process, is preferable.
- the viscosity of the coating solution for the high refractive index layer and the coating solution for the low refractive index layer at the time of simultaneous multilayer coating is not particularly limited, but when using the slide bead coating method, the viscosity at 45 ° C. is 5 to 100 mPa. S is preferable, and 10 to 50 mPa ⁇ s is more preferable.
- the viscosity at 45 ° C. is preferably 5 to 1200 mPa ⁇ s, and more preferably 25 to 500 mPa ⁇ s.
- the viscosity of the coating solution at 15 ° C. is preferably 100 mPa ⁇ s or more, more preferably 100 to 30,000 mPa ⁇ s, and further preferably 3,000 to 30,000 mPa ⁇ s. It is preferably 10,000 to 30,000 mPa ⁇ s.
- the conditions for the coating and drying method are not particularly limited.
- one of the coating solution for the high refractive index layer and the coating solution for the low refractive index layer heated to 30 to 60 ° C. Is coated on a substrate and dried to form a layer, and then the other coating solution is coated on this layer and dried.
- the infrared reflection layer is formed by repeating this as many times as necessary in order to exhibit the desired infrared shielding performance.
- Examples of the coating method include a roll coating method, a rod bar coating method, an air knife coating method, a spray coating method, a curtain coating method, or US Pat. No. 2,761,419, US Pat. No. 2,761,791.
- a slide bead coating method using the hopper described in the specification, an extrusion coating method, or the like is preferably used.
- the drying temperature is preferably 30 ° C. or higher.
- drying is preferably performed at a wet bulb temperature of 5 to 50 ° C. and a film surface temperature of 30 to 100 ° C. (preferably 10 to 50 ° C.).
- a drying method warm air drying, infrared drying, and microwave drying are used. Specific examples of the drying method include a method of blowing warm air of 40 to 60 ° C. for 1 to 5 seconds.
- drying may be performed by a single process or a multistage process, drying is preferably performed by a multistage process. In this case, it is more preferable that the temperature of the constant rate drying unit is smaller than the temperature of the reduction rate drying unit.
- the temperature range of the constant rate drying section is preferably 30 to 60 ° C.
- the temperature range of the decreasing rate drying section is preferably 50 to 100 ° C.
- a setting process means the process of cooling the coating film obtained by application
- the temperature of the cold air in the setting process is preferably 0 to 25 ° C., more preferably 5 to 10 ° C.
- the time for which the coating film is exposed to the cold air is preferably 10 to 360 seconds, more preferably 10 to 300 seconds, and further preferably 10 to 120 seconds, although it depends on the transport speed of the coating film.
- the time until the setting step is completed is preferably within 5 minutes, and more preferably within 2 minutes.
- the set time can be controlled by appropriately adjusting the type and concentration of the water-soluble resin and the metal oxide particles added as necessary.
- the “completion of the setting process” means a state in which the coating film component does not adhere to the finger when the finger is pressed against the surface of the coating film.
- the resin adhesive layer is usually formed by applying and drying a resin adhesive layer coating solution on an infrared reflective layer (low refractive index layer or high refractive index layer).
- the coating liquid for resin adhesive layer contains at least one selected from the group consisting of polyvinyl acetal resin, acrylic resin, and urethane resin and a solvent, and contains metal oxide particles and other additives as necessary.
- polyvinyl acetal resin acrylic resin, urethane resin, metal oxide particles, and other additives can be the same as those described above, description thereof is omitted here.
- the solvent is not particularly limited, and the same solvent as the above-described coating solution for the low refractive index layer and the coating solution for the high refractive index may be used.
- the total concentration of at least one selected from the group consisting of a polyvinyl acetal resin, an acrylic resin, and a urethane resin that can be contained in the coating solution for the resin adhesive layer is preferably 2 to 30% by mass.
- the application and drying methods of the resin adhesive layer coating solution can be performed in the same manner as the infrared reflective layer. Therefore, the resin adhesive layer may be separately performed after the infrared reflective layer is formed, or may be performed simultaneously with the formation of the infrared reflective layer. It is preferable to perform it separately from the viewpoint of adhesion.
- an infrared reflective layer is composed of 17 layers and a layer composed of an infrared reflective layer, a base material, an infrared reflective layer, and a resin adhesive layer is formed by simultaneous application of nine layers
- a 9-layer simultaneous multilayer coating is performed on the top using a low-refractive index layer coating solution and a high-refractive index layer coating solution, and dried to form a 9-layer laminate.
- nine layers are simultaneously applied and dried.
- the hard coat layer is usually formed by applying and drying a hard coat layer coating solution, and further heating and / or irradiating active energy rays.
- the hard coat layer coating solution contains an active energy ray-curable resin and a solvent.
- a thermosetting resin or the like may be included as necessary.
- the active energy ray-curable resin and the thermosetting resin can be the same as those described above, the description thereof is omitted here.
- the solvent is not particularly limited, and methyl acetate, propylene glycol monomethyl ether, methyl ethyl ketone, ethyl acetate and the like can be used.
- the concentration of the active energy ray-curable resin that can be contained in the coating solution for the hard coat layer is preferably 50 to 95% by mass. Under the present circumstances, when the coating liquid for hard-coat layers contains a thermosetting resin etc. with active energy ray curable resin, it is preferable that the sum of the density
- a coating method is not particularly limited, and a gravure coating method or the like can be used.
- the drying method is not particularly limited, and examples thereof include heating and blowing of warm air.
- the drying temperature is not particularly limited, but is preferably 30 to 110 ° C.
- the active energy ray-curable resin in the coating liquid for hard coat layer can be used as a hard coat agent by irradiating an active energy ray (for example, an ultraviolet lamp) to cause crosslinking or the like of the active energy ray-curable resin.
- an active energy ray for example, an ultraviolet lamp
- the thermosetting resin can be crosslinked or the like by heating to become a hard coat agent.
- the temperature in the drying step may be adjusted, and drying and heating may be performed simultaneously.
- the heating temperature is preferably 20 to 120 ° C., more preferably 50 to 100 ° C.
- the light reflecting film provided by the present invention can shield light having a predetermined wavelength by controlling the optical film thickness and the like, and thus can be applied to various uses as a light reflector according to the light to be shielded. can do.
- an ultraviolet shielding body using an ultraviolet shielding film that reflects ultraviolet light a decorative body using a light-colored film that reflects visible light
- an infrared shielding body using an infrared shielding film that reflects infrared light a predetermined wavelength
- a decorative body using a metallic glossy film that reflects the light for example, an ultraviolet shielding body using an ultraviolet shielding film that reflects ultraviolet light, a decorative body using a light-colored film that reflects visible light, an infrared shielding body using an infrared shielding film that reflects infrared light, a predetermined wavelength
- a decorative body using a metallic glossy film that reflects the light a metallic glossy film that reflects the light.
- an infrared shielding body using an infrared shielding film which is a typical example of a light reflecting film, will be described, but the present invention is not limited thereto.
- the infrared shielding film provided by the present invention is, for example, bonded to equipment exposed to sunlight for a long period of time such as an outdoor window of a building or an automobile window, and an infrared shielding film that imparts an infrared shielding effect. It is used mainly for the purpose of enhancing weather resistance as a film for window pasting, a film for agricultural greenhouses, and the like.
- the infrared shielding film according to the present invention is bonded to a substrate such as glass or a glass substitute resin directly or via an adhesive.
- an infrared shielding body in which the infrared shielding film according to the present invention is provided on at least one surface of a substrate.
- FIG. 1 is a schematic cross-sectional view showing a general configuration of an infrared shield used in an embodiment of the present invention.
- the infrared shielding film in FIG. 1 has an infrared reflection layer on one surface of a substrate. That is, it has a substrate (including an undercoat layer), an infrared reflection layer, a resin adhesive layer, and a hard coat layer.
- the infrared reflective layer 13 formed on the substrate 11 has a configuration in which low refractive index layers 14 and high refractive index layers 15 are alternately stacked. More specifically, five low-refractive-index layers 14 and four high-refractive-index layers 15 are alternately stacked so that the low-refractive index layers 14 are arranged in the lowermost layer and the uppermost layer on the substrate side.
- a 9-layer multi-layer product in which five layers of low-refractive index layers 14 and four layers of high-refractive index layers 15 are alternately laminated so as to have the same configuration is formed. It is the structure of the formed single-sided 18-layer multilayer product (infrared reflective layer 13).
- the uppermost low refractive index layer 14 of the 18-layer multilayer product on one side of the base material 11 (for example, the surface on the indoor side opposite to the side into which the sunlight L is inserted).
- a transparent hard coat layer (HC layer) 17 is formed through the resin adhesive layer 16. High adhesion can be obtained by bonding the infrared reflective layer 13 and the hard coat layer 17 through the resin adhesive layer 16.
- a transparent adhesive layer 18 is formed on the other surface of the substrate 11 (for example, a surface to be attached to the substrate 19 such as an automobile window).
- the infrared shielding film 1 should just be affixed on the indoor (in-vehicle or indoor) side of the base body 19 such as an automobile window or a glass window of a building (the infrared shielding film 1 is also attached to the base body 19 in FIG. 1). It shows the state after pasting.)
- the undercoat layer 12 is formed on one surface of the base material 11 .
- the transparent adhesive layer 18 is not necessarily required, and the transparent adhesive layer 18 may be omitted.
- the transparent adhesive layer 18 may be formed on the hard coat layer (HC layer) 17.
- a release layer (not shown) may be provided on the adhesive layer 18, and the release layer may be peeled off when being attached to the substrate 19.
- a release layer (not shown) may be provided on the hard coat layer (HC layer) 17, and the release layer may be peeled off after being attached to the substrate 19.
- a conductive layer for example, a conductive layer, an antistatic layer, a gas barrier layer, an easy adhesive layer, an antifouling layer, a deodorant layer, a droplet layer, a slippery layer, wear resistance
- 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, adhesive layer, high refractive index layer and low refractive index layer of the present invention
- Infrared cut layer metal layer, liquid crystal layer), colored layer (visible light absorbing layer), one or more functional layers such as an interlayer film used for laminated glass
- one or more functional layers such as an interlayer film used for laminated glass
- FIG. 2 is a schematic cross-sectional view showing a general configuration of an infrared shielding body used in one embodiment of the present invention.
- the infrared shielding film of FIG. 2 has an infrared reflective layer on both surfaces of the substrate. That is, it has an infrared reflection layer, a substrate (including an undercoat layer), an infrared reflection layer, a resin adhesive layer, and a hard coat layer.
- FIG. 2 is a schematic cross-sectional view showing a general configuration of an infrared shielding body used in another embodiment of the present invention.
- the infrared shielding film 1 ′ in FIG. 2 includes a base material 11, an undercoat layer 12 formed on both surfaces of the base material 11, and an infrared reflective layer 13 formed on the undercoat layer 12 on both surfaces of the base material 11. And have.
- Each infrared reflection layer 13 formed on both surfaces of the substrate 11 has a configuration in which low refractive index layers 14 and high refractive index layers 15 are alternately stacked. More specifically, five low-refractive-index layers 14 and four high-refractive-index layers 15 are alternately stacked so that the low-refractive index layers 14 are arranged in the lowermost layer and the uppermost layer on the substrate side.
- the 9-layer multilayer product (infrared reflective layer 13) thus formed is formed on both surfaces of the substrate 11, respectively.
- the resin is placed on the uppermost low refractive index layer 14 of the nine-layer multilayer product (laminated unit 13) on one side of the base material 11 (for example, the surface on the indoor side opposite to the side into which sunlight L is inserted).
- a transparent hard coat layer (HC layer) 17 is formed through the adhesive layer 16. High adhesion can be obtained by bonding the infrared reflective layer 13 and the hard coat layer 17 through the resin adhesive layer 16.
- a transparent adhesive layer 18 is formed on the uppermost low refractive index layer 14 of the nine-layer multilayer product (laminated unit 13) on the other surface of the substrate 11 (for example, the surface to be attached to the substrate 19 such as an automobile window). Has been.
- the infrared shielding film 1 ′ may be attached to the interior (inside or inside the vehicle) of the base body 19 such as an automobile window or a glass window of a building (in FIG. 2, the infrared shielding film 1 ′ is attached to the base body 19). It shows the state after pasting.)
- the undercoat layer 12 is formed on both surfaces of the base material 11 is shown.
- the transparent adhesive layer 18 is not necessarily required, and the transparent adhesive layer 18 may be omitted.
- the transparent adhesive layer 18 may be formed on the hard coat layer (HC layer) 17.
- a release layer (not shown) may be provided on the adhesive layer 18, and the release layer may be peeled off when being attached to the base 19.
- a release layer (not shown) may be provided on the hard coat layer (HC layer) 17, and the release layer may be peeled off after being attached to the substrate 19.
- a conductive layer for example, a conductive layer, an antistatic layer, a gas barrier layer, an easy adhesive layer, an antifouling layer, a deodorant layer, a droplet layer, a slippery layer, wear resistance
- 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, adhesive layer, high refractive index layer and low refractive index layer of the present invention
- Infrared cut layer metal layer, liquid crystal layer), colored layer (visible light absorbing layer), one or more functional layers such as an interlayer film used for laminated glass
- one or more functional layers such as an interlayer film used for laminated glass
- the substrate that can be used in this embodiment is not particularly limited, but glass, polycarbonate resin, polysulfone resin, acrylic resin, polyolefin resin, polyether resin, polyester resin, polyamide resin, polysulfide resin, unsaturated polyester resin, epoxy resin, Examples thereof include melamine resin, phenol resin, diallyl phthalate resin, polyimide resin, urethane resin, polyvinyl acetate resin, polyvinyl alcohol resin, styrene resin, vinyl chloride resin, metal plate, ceramic and the like.
- the type of the resin may be any of a thermoplastic resin, a thermosetting resin, and an ionizing radiation curable resin, and two or more of these may be used in combination.
- the substrate can be produced by a known method such as extrusion molding, calender molding, injection molding, hollow molding, compression molding or the like.
- the thickness of the substrate is not particularly limited, but is preferably 0.1 mm to 5 cm.
- the adhesive layer or adhesive layer that bonds the infrared shielding film and the substrate is preferably provided with the infrared shielding film on the sunlight (heat ray) incident surface side.
- an adhesive mainly composed of a photocurable or thermosetting resin can be used.
- the adhesive preferably has durability against ultraviolet rays, and is preferably an acrylic adhesive or a silicone adhesive. Furthermore, an acrylic adhesive is preferable from the viewpoint of adhesive properties and cost. In particular, a solvent system is preferable in the acrylic pressure-sensitive adhesive because the peel strength can be easily controlled. When a solution polymerization polymer is used as the acrylic solvent-based pressure-sensitive adhesive, known monomers can be used as the monomer.
- polyvinyl butyral resin or ethylene-vinyl acetate copolymer resin used as an intermediate layer of laminated glass may be used.
- plastic polyvinyl butyral manufactured by Sekisui Chemical Co., Ltd., Mitsubishi Monsanto Co., Ltd.
- ethylene-vinyl acetate copolymer manufactured by DuPont, Takeda Pharmaceutical Company Limited, duramin
- modified ethylene-vinyl acetate copolymer (Mersen G, manufactured by Tosoh Corporation).
- Measure solar transmittance, solar reflectance, emissivity, and visible light transmittance (1) Using a spectrophotometer with a wavelength (300 to 2500 nm), measure the spectral transmittance and spectral reflectance of various single glass plates. The emissivity is measured using a spectrophotometer having a wavelength of 5.5 to 50 ⁇ m. In addition, a predetermined value is used for the emissivity of float plate glass, polished plate glass, mold plate glass, and heat ray absorbing plate glass. (2) The solar transmittance, solar reflectance, solar absorption rate, and modified emissivity are calculated according to JIS R 3106: 1998 by calculating solar transmittance, solar reflectance, solar absorption rate, and vertical emissivity.
- the corrected emissivity is obtained by multiplying the vertical emissivity by the coefficient shown in JIS R 3107: 1998.
- the heat insulation and solar heat shielding properties are calculated by (1) calculating the thermal resistance of the multi-layer glass according to JIS R 3209: 1998 using the measured thickness value and the corrected emissivity. However, when the hollow layer exceeds 2 mm, the gas thermal conductance of the hollow layer is determined according to JIS R 3107: 1998.
- the heat insulation is obtained by adding a heat transfer resistance to the heat resistance of the double-glazed glass and calculating the heat flow resistance.
- Solar heat shielding properties are calculated by obtaining the solar heat acquisition rate according to JIS R 3106: 1998 and subtracting from 1.
- Example 1 ⁇ Manufacture of infrared shielding film> An infrared shielding film was manufactured as a light reflecting film.
- Base material As a base material, a polyethylene terephthalate film (A4300, double-sided easy-adhesion layer, thickness: 50 ⁇ m, length 200 m ⁇ width 210 mm, manufactured by Toyobo Co., Ltd.) was prepared.
- A4300 double-sided easy-adhesion layer, thickness: 50 ⁇ m, length 200 m ⁇ width 210 mm, manufactured by Toyobo Co., Ltd.
- a refractive index layer was formed using a wet film formation method.
- a coating solution for a low refractive index layer was prepared. Specifically, 430 parts of colloidal silica (10% by mass) (Snowtex OXS; manufactured by Nissan Chemical Industries, Ltd.), 150 parts of boric acid aqueous solution (3% by mass), 85 parts of water, 300 parts of polyvinyl alcohol (4% by mass) (JP-45; degree of polymerization: 4500; degree of saponification: 88 mol%; manufactured by Nihon Acetate Bipoval Co., Ltd.), 3 parts of surfactant (5% by mass) (softazoline LSB-R; river Were added in this order at 45 ° C. And it finished to 1000 parts with pure water, and prepared the coating liquid for low refractive index layers.
- a coating solution for a high refractive index layer was prepared. Specifically, a dispersion of silica-modified titanium oxide particles was prepared in advance, and a solvent or the like was added thereto.
- a dispersion of silica-modified titanium oxide particles was prepared as follows.
- An aqueous titanium sulfate solution was thermally hydrolyzed by a known method to obtain titanium oxide hydrate.
- the obtained titanium oxide hydrate was suspended in water to obtain 10 L of an aqueous suspension (TiO 2 concentration: 100 g / L).
- To this was added 30 L of an aqueous sodium hydroxide solution (concentration: 10 mol / L) with stirring, the temperature was raised to 90 ° C., and the mixture was aged for 5 hours.
- the obtained solution was neutralized with hydrochloric acid, filtered and washed with water to obtain a base-treated titanium compound.
- the base-treated titanium compound was suspended in pure water and stirred so that the TiO 2 concentration was 20 g / L. Under stirring, it was added citric acid in an amount of 0.4 mol% with respect to TiO 2 weight. The temperature was raised to 95 ° C., concentrated hydrochloric acid was added to a hydrochloric acid concentration of 30 g / L, and the liquid temperature was maintained, followed by stirring for 3 hours.
- the pH and zeta potential of the obtained mixed solution were measured, the pH was 1.4 and the zeta potential was +40 mV.
- the particle size was measured with Zetasizer Nano (manufactured by Malvern), the volume average particle size was 35 nm and the monodispersity was 16%.
- a solvent or the like was added to the silica-modified titanium oxide particle sol aqueous dispersion prepared in this way to prepare a coating solution for a high refractive index layer.
- a low refractive index layer coating solution and a high refractive index layer coating solution are kept at 45 ° C., while being heated to 45 ° C.
- Nine layers were applied.
- the lowermost layer and the uppermost layer were low refractive index layers, and other than that, the low refractive index layers and the high refractive index layers were alternately laminated.
- the coating amount was adjusted such that the film thickness during drying was 150 nm for each low refractive index layer and 130 nm for each high refractive index layer.
- the film thickness was confirmed by cutting the manufactured infrared shielding film and observing the cut surface with an electron microscope. At this time, when the interface between the two layers could not be clearly observed, the interface was determined by the XPS profile in the thickness direction of TiO 2 contained in the layer obtained by the XPS surface analyzer.
- a 9-layer multilayer coating was performed on the back surface of the 9-layer multilayer coated product (a substrate surface (back surface) opposite to the 9-layer multilayer coated substrate surface).
- Resin adhesive layer On one side of the infrared reflective layer obtained above, 10.0 mass% polyvinyl acetal resin ethanol solution (BX-L, acetalization rate: 61 mol%, manufactured by Sekisui Chemical Co., Ltd.) was dried. The resin adhesive layer was formed by apply
- Hard coat layer coating solution 73 parts pentaerythritol tri / tetraacrylate (NK ester A-TMM-3, Shin-Nakamura Chemical Co., Ltd.), 5 parts Irgacure 184 (Ciba Japan Co., Ltd.), 1 Part of a silicone surfactant (KF-351A, manufactured by Shin-Etsu Chemical Co., Ltd.), 10 parts of propylene glycol monomethyl ether, 70 parts of methyl acetate, and 70 parts of methyl ethyl ketone were obtained.
- the mixed solution was filtered through a polypropylene filter having a pore size of 0.4 ⁇ m to prepare a hard coat layer coating solution.
- the said coating liquid for hard-coat layers was apply
- UV irradiation While purging with nitrogen, the coating film obtained using an ultraviolet lamp was cured.
- the curing conditions were oxygen concentration: 1.0% by volume or less, illuminance: 100 mW / cm 2 , and irradiation amount: 0.2 J / cm 2 .
- the obtained infrared shielding film has a configuration of an infrared reflecting film (9 layers) -base material-infrared reflecting film (9 layers) -resin adhesive layer-hard coat layer.
- Example 2 Except that the polyvinyl acetal resin was changed to a 10.0 mass% polyvinyl acetal resin aqueous solution (KW-1, acetalization rate: 9 mol%, manufactured by Sekisui Chemical Co., Ltd.), the same method as in Example 1 was used. An infrared shielding film was produced.
- Example 3 Except that the polyvinyl acetal resin was changed to a 10.0 wt% aqueous polyvinyl acetal resin solution (KW-3, acetalization rate: 30 mol%, manufactured by Sekisui Chemical Co., Ltd.), the same method as in Example 1 was used. An infrared shielding film was produced.
- Example 4 A polyvinyl acetal resin aqueous solution (KW-3, acetalization rate: 30 mol%, manufactured by Sekisui Chemical Co., Ltd.) was converted into a polyvinyl acetal resin aqueous solution (KW-1, acetalization rate: 10 mol%, manufactured by Sekisui Chemical Co., Ltd.) and polyvinyl.
- KW-1: KW-3 2: 1 (mass ratio of solid content) mixture (acetalization rate: 16 mol%)
- the infrared shielding film was manufactured by the same method as Example 3 except having changed into.
- the obtained infrared shielding film has a configuration of an infrared reflecting film (9 layers) -base material-infrared reflecting film (9 layers) -resin adhesive layer-hard coat layer.
- FIG. 5 Polyvinyl acetal resin aqueous solution (KW-3, acetalization rate: 30 mol%, manufactured by Sekisui Chemical Co., Ltd.), polyvinyl acetal resin (BX-L, acetalization rate: 61 mol%,
- the obtained infrared shielding film has a configuration of an infrared reflecting film (9 layers) -base material-infrared reflecting film (9 layers) -resin adhesive layer-hard coat layer.
- Example 6 An infrared shielding film was produced in the same manner as in Example 1 except that the polyvinyl acetal resin was changed to 10.0% by mass of an acrylic resin emulsion aqueous solution (Aron A-106, manufactured by Toagosei Co., Ltd.). .
- Example 7 An infrared shielding film was produced in the same manner as in Example 1 except that the polyvinyl acetal resin was changed to a 10.0% by mass acrylic resin aqueous solution (Julimer AT-210, manufactured by Toagosei Co., Ltd.).
- Example 8 Except for changing to an ethyl acetate solution containing 10.0% by mass acrylic resin (UH-3900, manufactured by Toagosei Co., Ltd.) instead of the 10.0% by mass polyvinyl acetal resin ethanol solution. An infrared shielding film was produced in the same manner as in Example 1.
- Example 9 An infrared shielding film was produced in the same manner as in Example 1 except that the polyvinyl acetal resin was changed to a 10.0% by mass urethane resin emulsion aqueous solution (Hydran AP-40F, manufactured by DIC Corporation).
- Example 10 Except that 20% by mass of colloidal silica particles (ST-OXS, manufactured by Nissan Chemical Industries, Ltd.) with respect to the polyvinyl acetal resin was added to the coating solution for the resin adhesive layer, the same method as in Example 3 was used. An infrared shielding film was produced.
- colloidal silica particles ST-OXS, manufactured by Nissan Chemical Industries, Ltd.
- Example 11 (Base material) A substrate similar to that of Example 1 was prepared.
- the low refractive index layer coating solution and the high refractive index layer coating solution were the same as in Example 1. On the other hand, the same coating solution as that used in Example 10 was used for the resin adhesive layer.
- the other surface of the base material was subjected to nine-layer coating using the coating solution for the resin adhesive layer used in Example 10 together with the coating solution for the low refractive index layer and the coating solution for the high refractive index layer. That is, the resin adhesive layer was formed simultaneously with the infrared reflective layer. Nine-layer coating was performed such that the outermost layer (the layer farthest from the substrate) was the resin adhesive layer. Thereafter, it was dried in the same manner as described above.
- the obtained infrared shielding film has a structure of an infrared reflecting film (9 layers) -base material-infrared reflecting film (8 layers) -resin adhesive layer-hard coat layer.
- Example 12 An infrared shielding film was produced in the same manner as in Example 11 except that the 9-layer multilayer coating for forming the resin adhesive layer simultaneously with the infrared reflective layer was changed to the 10-layer multilayer coating.
- the obtained infrared shielding film has a configuration of an infrared reflecting film (9 layers) -base material-infrared reflecting film (9 layers) -resin adhesive layer-hard coat layer.
- Example 13 An infrared shielding film was produced in the same manner except that a zirconium compound (manufactured by San Nopco; AZ coat 5800MT) was further added to the resin adhesive layer of Example 12 in an amount of 0.25% by mass based on the polyvinyl acetal resin.
- a zirconium compound manufactured by San Nopco; AZ coat 5800MT
- Example 14 An infrared shielding film was produced in the same manner as in Example 3 except that the 9-layer coating was changed to the 21-layer coating.
- the obtained infrared shielding film has a configuration of an infrared reflecting film (21 layers) -a substrate-an infrared reflecting film (21 layers) -a resin adhesive layer-a hard coat layer.
- Example 15 (Base material) A substrate similar to that of Example 1 was prepared.
- a refractive index layer was formed by extrusion molding of resin.
- (PMMA (152 nm) / PEN (137 nm)) 64 is a stack of 64 units in which PMMA having a film thickness of 152 nm and PEN having a film thickness of 137 nm are stacked in this order. It means that.
- An infrared shielding film was prepared in the same manner as in Example 3 except that this infrared reflective film was used as the infrared reflective layer.
- the obtained infrared shielding film has a structure of base material-infrared reflective film (256 layers) -resin adhesive layer-hard coat layer.
- Example 3 Specifically, in the formation of the infrared reflective layer of Example 3, except that the film thickness during drying was adjusted so that the low refractive index layer was 70 nm for each layer and the high refractive index layer was 50 nm for each layer, An ultraviolet shielding film was produced in the same manner as in Example 3.
- the obtained ultraviolet shielding film has a structure of ultraviolet reflecting film (9 layers) -base material-ultraviolet reflecting film (9 layers) -resin adhesive layer-hard coat layer.
- Example 1 An infrared shielding film was produced in the same manner as in Example 1 except that the polyvinyl acetal resin was changed to a 10.0% by mass vinyl acetate resin emulsion (Vinyl Blanc 4018, manufactured by Nissin Chemical Industry Co., Ltd.). .
- Example 2 An infrared shielding film was produced in the same manner as in Example 1 except that the resin adhesive layer was not formed.
- ⁇ No peeling is observed. ⁇ : Peeling of 5% or less is observed with respect to the entire area of the bonding surface. ⁇ : Peeling of over 5% to 35% is observed with respect to the area of the entire bonding surface. Exfoliation of more than 35% is seen with respect to the entire area of the bonding surface.
- ⁇ 1% or less ⁇ : Over 1% to 3% or less ⁇ : Over 3%.
- the infrared shielding film was attached to the window using an acrylic adhesive and left in an environment of 60 ° C. and 90% RH. Two months later, the infrared shielding film was visually observed and evaluated according to the following criteria. In addition, when the adhesiveness of an infrared reflective layer and a hard-coat layer falls, there exists a tendency for transparency to fall and to appear blurry.
- ⁇ The outside looks good with no problem.
- ⁇ The outside looks a little blurred (no problem in practical use)
- X The outside looks blurry as a whole.
- the infrared shielding film was internally attached to the window using an acrylic adhesive and left in an environment of 43 ° C. and 50% RH. After 6 months, the infrared shielding film was visually observed and evaluated according to the following criteria. In addition, when the adhesiveness of an infrared reflective layer and a hard-coat layer falls, there exists a tendency for transparency to fall and to appear blurry.
- ⁇ The outside looks good with no problem.
- ⁇ The outside looks a little blurred (no problem in practical use)
- X The outside looks blurry as a whole.
- the infrared reflective layer and the hard coat layer have high adhesion by adhering the infrared reflective layer and the hard coat layer through the resin according to the present invention. I understand.
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Abstract
Description
(2)前記樹脂接着層が、ポリビニルアセタール樹脂を含む、(1)に記載の光反射フィルム;
(3)前記ポリビニルアセタール樹脂のアセタール化率が、15~50mol%である、(2)に記載の光反射フィルム;
(4)前記樹脂接着層が、金属酸化物粒子をさらに含む、(1)~(3)のいずれか1つに記載の光反射フィルム;
(5)前記樹脂接着層が、ジルコニウム化合物をさらに含む、請求項(1)~(4)のいずれか1つに記載の光反射フィルム;
(6)基体と、前記基体の少なくとも一方の面に配置された(1)~(5)のいずれか1つに記載の光反射フィルムと、を含む、光反射体。
赤外遮蔽フィルムは、基材上に、高屈折率層および低屈折率層を含む赤外反射層と、樹脂接着層と、ハードコート層と、がこの順に積層されてなる。この際、赤外反射層は、基材の両面に設けられていてもよい。
赤外遮蔽フィルムに用いられる基材としては、透明であれば特に限定されるものではない。かような基材としては、例えば、メタクリル酸エステル、ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)、ポリカーボネート(PC)、ポリアリレート、ポリスチレン(PS)、芳香族ポリアミド、ポリエーテルエーテルケトン、ポリスルホン、ポリエーテルスルホン、ポリイミド、ポリエーテルイミド等の樹脂からなるフィルム、さらには前記樹脂を二層以上積層してなる樹脂フィルム等が挙げられる。コストや入手の容易性の観点から、ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)、ポリカーボネート(PC)を用いることが好ましい。
赤外反射層は、高屈折率層および低屈折率層を含む。前記赤外反射層は、赤外反射層は、高屈折率層と低屈折率層とから構成される積層体(ユニット)を少なくとも1つ含む構成を有するものであればよいが、高屈折率層および低屈折率層が交互に複数積層された形態を有することが好ましい。この場合、赤外反射層の最上層および最下層は高屈折率層および低屈折率層のいずれであってもよいが、最上層および最下層の両者が低屈折率層であることが好ましい。最上層が低屈折率層であると塗布性が良くなり、最下層が低屈折率層であると密着性が良くなる為である。
屈折率層としては、特に制限はないが、当該技術分野において用いられる公知の屈折率層を用いることが好ましい。公知の屈折率層としては、例えば、樹脂の押出成形によって形成される屈折率層および湿式製膜法を用いて形成する屈折率層が挙げられる。
樹脂の押出成形によって形成される屈折率層の形成方法としては、例えば、樹脂を溶融して得られた溶融樹脂を、多層押し出しダイよりキャスティングドラム上に押し出した後、急冷する方法が挙げられる。この際、溶融樹脂の押し出し冷却後、樹脂シートを延伸させてもよい。樹脂の延伸倍率としては、樹脂に合わせて適宜選択することできるが、縦軸方向および横軸方向にそれぞれ2~10倍であることが好ましい。
湿式成膜法では、塗布液を順次塗布、乾燥する方法、塗布液を重層塗布、乾燥する方法等によって屈折率層が形成されうる。
水溶性樹脂としては、特に制限されないが、ポリビニルアルコール系樹脂、ゼラチン、セルロース類、増粘多糖類、および反応性官能基を有するポリマーが用いられうる。これらのうち、ポリビニルアルコール系樹脂を用いることが好ましい。なお、本明細書において、「水溶性」とは、水媒体に対し、1質量%以上、好ましくは3質量%以上が溶解する化合物を意味する。
用いられうるゼラチンとしては、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が挙げられる。より詳細には、酸処理ゼラチン、アルカリ処理ゼラチン、酵素処理ゼラチン、およびこれらの誘導体が挙げられる。
用いられうるセルロース類としては、特に制限されないが、水溶性のセルロース誘導体が好ましく用いられうる。当該水溶性のセルロース誘導体としては、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;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。
用いられうる増粘多糖類としては、特に制限はなく、一般に知られている天然単純多糖類、天然複合多糖類、合成単純多糖類および合成複合多糖類等が挙げられる。具体的には、ペクチン、ガラクタン(例えば、アガロース、アガロペクチン等)、ガラクトマンノグリカン(例えば、ローカストビーンガム、グアラン等)、キシログルカン(例えば、タマリンドガム、タマリンドシードガム等)、グルコマンノグリカン(例えば、蒟蒻マンナン、木材由来グルコマンナン、キサンタンガム等)、ガラクトグルコマンノグリカン(例えば、針葉樹材由来グリカン)、アラビノガラクトグリカン(例えば、大豆由来グリカン、微生物由来グリカン等)、グルコラムノグリカン(例えば、ゲランガム等)、グリコサミノグリカン(例えば、ヒアルロン酸、ケラタン硫酸等)、アルギン酸およびアルギン酸塩、寒天、κ-カラギーナン、λ-カラギーナン、ι-カラギーナン、ファーセレラン等の紅藻類に由来する天然高分子多糖類等が挙げられる。
用いられる反応性官能基を有するポリマーとしては、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-アクリロニトリル共重合体、アクリル酸カリウム-アクリロニトリル共重合体、酢酸ビニル-アクリル酸エステル共重合体、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、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およびそれらの塩が挙げられる。
金属酸化物粒子は、屈折率層に含有されうる任意の構成要素である。金属酸化物粒子を含むことによって、低屈折率層および高屈折率層の屈折率差を大きくすることができる。
第1の金属酸化物粒子としては、特に制限されないが、酸化亜鉛、合成非晶質シリカ、およびコロイダルシリカ等の二酸化ケイ素、アルミナ、コロイダルアルミナを挙げることができる。これらのうち、二酸化ケイ素を用いることが好ましく、コロイダルシリカを用いることが特に好ましい。なお、前記第1の金属酸化物は単独で用いても、2種以上を混合して用いてもよい。
第2の金属酸化物粒子としては、特に制限されないが、第1の金属酸化物粒子と異なるものであることが好ましい。具体例としては、酸化チタン、酸化ジルコニウム、酸化亜鉛、アルミナ、コロイダルアルミナ、酸化ニオブ、酸化ユーロピウム等が挙げられる。これらのうち、透明でより屈折率の高い高屈折率層を形成する観点から、酸化チタン、酸化ジルコニウムを用いることが好ましく、ルチル型(正方晶形)酸化チタン粒子を含有することがより好ましい。なお、第2の金属酸化物は、単独で用いても、2種以上を混合して用いてもよい。
本発明の一実施形態において、屈折率層中には、金属酸化物粒子を被覆(保護)する水溶性樹脂を含有することが好ましい。以下に、金属酸化物粒子を被覆(保護)する水溶性樹脂(以下、「保護剤」とも称する)について説明する。なお、当該保護剤は、金属酸化物粒子を溶媒に分散させやすくするための役割を有する。
屈折率層は、さらに硬化剤を含んでいてもよい。硬化剤は、屈折率層に含有される水溶性樹脂(好ましくは、ポリビニルアルコール系樹脂)と反応して、水素結合のネットワークを形成することができる。
屈折率層は、必要に応じてさらに各種の添加剤を含んでいてもよい。
樹脂接着層は、赤外反射層およびハードコート層間の密着性を高める機能を有する。前記樹脂接着層は、ポリビニルアセタール樹脂、アクリル樹脂、およびウレタン樹脂からなる群から選択される少なくとも1種を含む。樹脂接着層の厚さは、0.3~3μmであることが好ましく、0.5~2μmであることがより好ましい。
ポリビニルアセタール樹脂とは、ポリビニルアルコールの水酸基の少なくとも1つをアルデヒドと反応させてアセタール化した樹脂である。ポリビニルアセタール樹脂の具体例としては、ポリビニルホルマール、ポリビニルブチラール等のポリビニルアルコール;部分的にホルマル化したポリビニルブチラール等の部分ホルマル化ポリビニルアルコール;ポリビニルブチラールアセタール等の共重合アセタール等が挙げられる。これらのポリビニルアセタール樹脂は、その他の繰り返し単位を含有していてもよい。
アクリル樹脂とは、アクリル系モノマーをポリマーの構成成分とする樹脂である。当該アクリル系モノマーとしては、特に制限されないが、アクリル酸、メタクリル酸、アクリルアミド、メタクリルアミド、アクリル酸エステル、メタクリル酸エステル、アミノ基置換アルキルアクリレート、アミノ基置換アルキルメタクリレート、エポキシ基含有アクリレート、置換アクリルアミド、置換メタクリルアミド、アクリル酸の塩、メタクリル酸の塩等が挙げられる。
ウレタン樹脂とは、ウレタン結合を介して形成される樹脂である。ウレタン樹脂としては、スルホン酸アルカリ塩基やカルボン酸アミン塩基を有する親水性ポリウレタン樹脂を用いることが好ましい。当該親水性ポリウレタン樹脂としては、ポリエチレングリコール-ジフェニルメタンジイソシアネート-エチレンジアミン、ジメチロールプロピオン酸アミン塩系ポリウレタン等が挙げられる。
樹脂接着層は、必要に応じて、金属酸化物粒子をさらに含んでいてもよい。
樹脂接着層は、必要に応じて、ジルコニウム化合物をさらに含んでいてもよい。ジルコニウム化合物を含有することで、密着性が向上しうる。
樹脂接着層は、さらに熱線吸収粒子を含むことが好ましい。
また、樹脂接着層は各種の添加剤を含んでいてもよい。
ハードコート層は、赤外遮蔽フィルムの傷を防止する機能を有する。前記ハードコート層は、ハードコート剤を含む。必要に応じて、その他の添加剤をさらに含んでもよい。
ハードコート剤としては、活性エネルギー線硬化樹脂が用いられる。その他、必要に応じて前記活性エネルギー線硬化樹脂とともに熱硬化樹脂等を用いてもよい。なお、本明細書において、「活性エネルギー線」とは、紫外線や電子線等の活性線を表し、好ましくは紫外線を意味する。
ハードコート層には、必要に応じて公知の添加剤を使用することができる。好ましい添加剤としては、赤外線を吸収または反射できる色素または顔料が挙げられる。
上記に挙げた構成では、赤外反射層(A)、樹脂接着層(B)、ハードコート層(C)の弾性率が以下のような弾性率差を設けることが好ましい。
赤外反射層の弾性率は、従来公知の弾性率測定方法により求めることができ、例えば、オリエンテック社製バイブロンDDV-2を用いて一定の歪みを一定の周波数(Hz)で掛ける条件下で測定する方法、測定装置としてRSA-II(レオメトリックス社製)を用い、透明基材上に赤外反射層を形成した後、一定周波数で印加歪を変化させたとき得られる測定値により求める方法、あるいは、ナノインデンテーション法を適用したナノインデンター、例えば、MTSシステム社製のナノインデンター(Nano IndenterTMXP/DCM)により測定することができる。
本発明の光反射フィルムの製造方法については特に制限はなく、基材上に、低屈折率層および高屈折率層を含む光反射層を形成することができるものであれば、いかなる方法でも用いられうる。
一実施形態において、赤外遮蔽フィルムは、基材上に低屈折率層用塗布液と高屈折率層用塗布液とを交互に塗布、乾燥して赤外反射層を形成し、次いで、前記赤外反射層に樹脂接着層用塗布液を塗布、乾燥して樹脂接着層を形成し、さらに、前記樹脂接着層に、ハードコート層用塗布液を塗布、乾燥し、さらに活性エネルギー線を照射してハードコート層を形成することで製造されうる。
用いられうる基材は上述したものと同様のものが用いられうることから、ここでは説明を省略する。
赤外反射層は、通常、基材上に、低屈折率層用塗布液と高屈折率層用塗布液とを交互に塗布、乾燥することで形成される。
低屈折率層用塗布液は、通常、水溶性樹脂および溶媒を含み、必要に応じて、第1の金属酸化物粒子、保護剤、硬化剤、およびその他の添加剤を含む。
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、水溶性樹脂、および必要に応じて添加される第1の金属酸化物粒子、保護剤、硬化剤、およびその他の添加剤を添加し、撹拌混合する方法が挙げられる。この際、各成分の添加順も特に制限されず、撹拌しながら各成分を順次添加し混合してもよいし、撹拌しながら一度に添加し混合してもよい。必要に応じて、さらに溶媒を用いて、適当な粘度に調整される。
高屈折率層用塗布液は、通常、水溶性樹脂および溶媒を含み、必要に応じて、第2の金属酸化物粒子、保護剤、硬化剤、およびその他の添加剤を含む。
基材上に、調製した低屈折率層用塗布液および高屈折率層用塗布液を塗布、乾燥することで赤外反射層を形成することができる。具体的には以下の形態が挙げられる;(1)基材上に、高屈折率層用塗布液を塗布し乾燥して高屈折率層を形成した後、低屈折率層用塗布液を塗布し乾燥して低屈折率層を形成し、赤外遮蔽フィルムを形成する方法;(2)基材上に、低屈折率層用塗布液を塗布し乾燥して低屈折率層を形成した後、高屈折率層用塗布液を塗布し乾燥して高屈折率層を形成し、赤外遮蔽フィルムを形成する方法;(3)基材上に、高屈折率層用塗布液と、低屈折率層用塗布液とを交互に逐次重層塗布した後乾燥して、高屈折率層、および低屈折率層を含む赤外遮蔽フィルムを形成する方法;(4)基材上に、高屈折率層用塗布液と、低屈折率層用塗布液とを同時重層塗布し、乾燥して、高屈折率層、および低屈折率層を含む赤外遮蔽フィルムを形成する方法;などが挙げられる。なかでも、より簡便な製造プロセスとなる上記(4)の方法が好ましい。
樹脂接着層は、通常、赤外反射層(低屈折率層または高屈折率層)上に、樹脂接着層用塗布液を塗布、乾燥することで形成される。
樹脂接着層用塗布液は、ポリビニルアセタール樹脂、アクリル樹脂、およびウレタン樹脂からなる群から選択される少なくとも1種および溶媒を含み、必要に応じて、金属酸化物粒子およびその他の添加剤を含む。
樹脂接着層用塗布液の塗布、乾燥方法は、赤外反射層と同様の方法で行うことができる。したがって、樹脂接着層は、赤外反射層の形成後に別途行ってもよいが、赤外反射層の形成と同時に行ってもよい。別途に行う方が、密着性の観点から好ましい。すなわち、例えば、赤外反射層が17層からなり、9層同時重層塗布で赤外反射層-基材-赤外反射層-樹脂接着層からなる層を形成する場合には、はじめに、基材上に低屈折率層用塗布液および高屈折率層用塗布液を用いて9層同時重層塗布を行い、乾燥して9層の積層体を形成する。次に積層体が形成された面とは反対側に低屈折率層用塗布液、高屈折率層用塗布液、および樹脂接着層用塗布液を用いて、9層同時重層塗布を行い、乾燥することで、基材、両面合わせて17層の赤外反射層、および樹脂接着層が積層されたフィルムを製造することができる。
ハードコート層は、通常、ハードコート層用塗布液を塗布、乾燥し、さらに加熱および/または活性エネルギー線を照射することで形成される。
ハードコート層用塗布液は、活性エネルギー線硬化性樹脂および溶媒を含む。必要に応じて、熱硬化性樹脂等を含んでいてもよい。
塗布方法としては、特に制限されないが、グラビアコート法等の方法が用いられうる。
ハードコート層用塗布液中の活性エネルギー線硬化性樹脂は、活性エネルギー線(例えば紫外線ランプ等)を照射することにより、活性エネルギー線硬化性樹脂が架橋等を起こし、ハードコート剤となりうる。
本発明により提供される光反射フィルムは、光学膜厚等を制御することで、所定の波長を有する光を遮蔽することができるため、遮蔽する光に応じて光反射体として種々の用途に適用することができる。例えば、紫外線を反射する紫外遮蔽フィルムを用いた紫外遮蔽体、可視光を反射する光着色フィルムを用いた加飾体、赤外線を反射する赤外遮蔽フィルムを用いた赤外遮蔽体、所定の波長の光を反射する金属光沢調フィルムを用いた加飾体が挙げられる。
本発明により提供される赤外遮蔽フィルムは、例えば、建物の屋外の窓や自動車窓等長期間太陽光に晒らされる設備に貼り合せ、赤外遮蔽効果を付与する赤外遮蔽フィルム等の窓貼用フィルム、農業用ビニールハウス用フィルム等として、主として耐候性を高める目的で用いられる。
<赤外遮蔽フィルムの製造>
光反射フィルムとして赤外遮蔽フィルムを製造した。
基材として、ポリエチレンテレフタレートフィルム(A4300、両面易接着層、厚さ:50μm、長さ200m×幅210mm、東洋紡績株式会社製)を準備した。
湿式成膜法を用いて屈折率層を形成した。
はじめに低屈折率層用塗布液を調製した。具体的には、430部のコロイダルシリカ(10質量%)(スノーテックスOXS;日産化学工業株式会社製)、150部のホウ酸水溶液(3質量%)、85部の水、300部のポリビニルアルコール(4質量%)(JP-45;重合度:4500;ケン化度:88mol%;日本酢ビ・ポバール株式会社製)、3部の界面活性剤(5質量%)(ソフタゾリンLSB-R;川研ファインケミカル株式会社製)、を45℃でこの順に添加した。そして、純水で1000部に仕上げ、低屈折率層用塗布液を調製した。
次に、高屈折率層用塗布液を調製した。具体的には、あらかじめシリカ変性酸化チタン粒子の分散液を調製し、これに溶媒等を添加した。
9層重層塗布可能なスライドホッパー塗布装置を用い、低屈折率層用塗布液および高屈折率層用塗布液を45℃に保温しながら、45℃に加温した基材上に、9層重層塗布を行った。この際、最下層および最上層は低屈折率層とし、それ以外は低屈折率層および高屈折率層がそれぞれ交互に積層されるように設定した。塗布量については、乾燥時の膜厚が低屈折率層は各層150nm、高屈折率層は各層130nmになるように調節した。なお、前記膜厚は、製造した赤外遮蔽フィルムを切断し、その切断面を電子顕微鏡により観察することで確認した。この際、2つの層間の界面を明確に観測することができない場合には、XPS表面分析装置により得た層中に含まれるTiO2の厚さ方向のXPSプロファイルにより界面を決定した。
上記で得られた赤外反射層上の一方の面に10.0質量%のポリビニルアセタール樹脂のエタノール液(BX-L、アセタール化率:61mol%、積水化学工業株式会社製)を乾燥後の膜厚が1μmとなる塗布量で塗布し、70℃で乾燥させることにより、樹脂接着層を形成した。
ハードコート層用塗布液
73部のペンタエリスリトールトリ/テトラアクリレート(NKエステルA-TMM-3、新中村化学工業株式会社製)と、5部のイルガキュア184(チバ・ジャパン株式会社製)と、1部のシリコーン系界面活性剤(KF-351A、信越化学工業株式会社製)と、10部のプロピレングリコールモノメチルエーテルと、70部の酢酸メチルと、70部のメチルエチルケトンと、を混合し、得られた混合液を孔径0.4μmのポリプロピレン製フィルターでろ過して、ハードコート層用塗布液を調製した。
前記ハードコート層用塗布液を、マイクログラビアコーターを用いて上記の樹脂接着層上に塗布し、恒率乾燥区間温度50℃、減率乾燥区間温度70℃で乾燥した。この際、塗布量については、乾燥時の膜厚が3μmになるように調節した。
窒素パージしながら、紫外線ランプを用いて得られた塗膜を硬化した。硬化条件は、酸素濃度:1.0体積%以下、照度:100mW/cm2、照射量:0.2J/cm2であった。
ポリビニルアセタール樹脂を10.0質量%のポリビニルアセタール樹脂水溶液(KW-1、アセタール化率:9mol%、積水化学工業株式会社製)に変更したことを除いては、実施例1と同様の方法で赤外遮蔽フィルムを製造した。
ポリビニルアセタール樹脂を10.0質量%のポリビニルアセタール樹脂水溶液(KW-3、アセタール化率:30mol%、積水化学工業株式会社製)に変更したことを除いては、実施例1と同様の方法で赤外遮蔽フィルムを製造した。
ポリビニルアセタール樹脂水溶液(KW-3、アセタール化率:30mol%、積水化学工業株式会社製)を、ポリビニルアセタール樹脂水溶液(KW-1、アセタール化率:10mol%、積水化学工業株式会社製)およびポリビニルアセタール樹脂水溶液(KW-3、アセタール化率:30mol%、積水化学工業株式会社製)のKW-1:KW-3=2:1(固形分の質量比)混合物(アセタール化率:16mol%)に変更したことを除いては、実施例3と同様の方法で赤外遮蔽フィルムを製造した。
ポリビニルアセタール樹脂水溶液(KW-3、アセタール化率:30mol%、積水化学工業株式会社製)を、ポリビニルアセタール樹脂(BX-L、アセタール化率:61mol%、積水化学工業株式会社製)およびポリビニルアセタール樹脂水溶液(KW-3、アセタール化率:30mol%、積水化学工業株式会社製)のBX-L:KW-3=1:1(固形分の質量比)混合物(アセタール化率:45mol%)に変更したことを除いては、実施例3と同様の方法で赤外遮蔽フィルムを製造した。
ポリビニルアセタール樹脂を10.0質量%のアクリル樹脂エマルジョン水溶液(アロンA-106、東亞合成株式会社製)に変更したことを除いては、実施例1と同様の方法で赤外遮蔽フィルムを製造した。
ポリビニルアセタール樹脂を10.0質量%のアクリル樹脂水溶液(ジュリマーAT-210、東亞合成株式会社製)に変更したことを除いては、実施例1と同様の方法で赤外遮蔽フィルムを製造した。
10.0質量%のポリビニルアセタール樹脂のエタノール液の代わりに10.0質量%のアクリル樹脂(UH-3900、東亞合成株式会社製)を含有する酢酸エチル溶液に変更したことを除いては、実施例1と同様の方法で赤外遮蔽フィルムを製造した。
ポリビニルアセタール樹脂を10.0質量%のウレタン樹脂エマルジョン水溶液(ハイドランAP-40F、DIC株式会社製)に変更したことを除いては、実施例1と同様の方法で赤外遮蔽フィルムを製造した。
樹脂接着層用塗布液に、ポリビニルアセタール樹脂に対して20質量%のコロイダルシリカ粒子(ST-OXS、日産化学工業株式会社製)を添加したことを除いては、実施例3と同様の方法で赤外遮蔽フィルムを製造した。
(基材)
実施例1と同様の基材を準備した。
低屈折率層用塗布液および高屈折率層用塗布液は実施例1と同様のものを用いた。一方、樹脂接着層用塗布液は実施例10と同様のものを用いた。
基材の一方の面には、実施例1と同様の方法で、低屈折率層および高屈折率層が交互に9層積層された赤外反射層を形成した。
実施例1と同様の方法で樹脂接着層上にハードコート層を形成した。
樹脂接着層を赤外反射層と同時に形成する9層重層塗布を、10層重層塗布に変更したことを除いては、実施例11と同様の方法で赤外遮蔽フィルムを製造した。
実施例12の樹脂接着層にさらにジルコニウム化合物(サンノプコ社製;AZコート5800MT)をポリビニルアセタール樹脂に対して0.25質量%加えた以外は同様にして赤外遮蔽フィルムを製造した。
9層重層塗布を21層重層塗布に変更したことを除いては、実施例3と同様の方法で赤外遮蔽フィルムを製造した。
(基材)
実施例1と同様の基材を準備した。
樹脂の押出成形によって屈折率層を形成した。
赤外反射層として本赤外反射膜を使用した以外は実施例3と同様にして赤外遮蔽フィルムを作成した。
<紫外遮蔽フィルムの製造>
光反射フィルムとして紫外遮蔽フィルムを製造した。
ポリビニルアセタール樹脂を10.0質量%の酢酸ビニル樹脂エマルジョン(ビニブラン4018、日信化学工業株式会社製)に変更したことを除いては、実施例1と同様の方法で赤外遮蔽フィルムを製造した。
樹脂接着層を形成しなかったことを除いては、実施例1と同様の方法で赤外遮蔽フィルムを製造した。
ハードコート層を、熱硬化性樹脂であるKP-86(信越シリコーン社製)を用い、80℃、1分間加熱することによって形成したことを除いては、実施例10と同様の方法で赤外遮蔽フィルムを製造した。
[赤外透過率および可視光透過率]
分光光度計(積分球使用、株式会社日立製作所製、U-4000型)を用い、各赤外遮蔽フィルムの300nm~2000nmの領域における透過率を測定した。可視光透過率は550nmにおける透過率の値を、赤外透過率は1200nmにおける透過率の値を、それぞれ用いた。
JIS K5600-5-6(1999)(クロスカット法)に準拠して、赤外反射層およびハードコート層のはがれを確認した。密着性の評価は下記の基準に従って評価した。
○:接着面全体の面積に対して5%以下のはがれが見られる
△:接着面全体の面積に対して5%超~35%以下のはがれが見られる
×:接着面全体の面積に対して35%超のはがれが見られる。
ヘイズメーター(日本電色工業株式会社製、NDH2000)を用いて、ヘイズ値を測定した。下記の基準に従って評価した。
△:1%超~3%以下
×:3%超。
赤外遮蔽フィルムを、アクリル接着剤を用いて窓に内貼りし、60℃90%RHの環境で放置した。2カ月後、赤外遮蔽フィルムを目視で観察し、下記の基準に従って評価した。なお、赤外反射層およびハードコート層の密着性が低下した場合には、透明性が低下してぼやけて見える傾向がある。
○:一部だけ外が少しぼやけて見える(実用上問題無し)
×:全体的に外がぼやけて見える。
赤外遮蔽フィルムを、アクリル接着剤を用いて窓に内貼りし、43℃50%RHの環境で放置した。6カ月後、赤外遮蔽フィルムを目視で観察し、下記の基準に従って評価した。なお、赤外反射層およびハードコート層の密着性が低下した場合には、透明性が低下してぼやけて見える傾向がある。
○:一部だけ外が少しぼやけて見える(実用上問題無し)
×:全体的に外がぼやけて見える。
11 基材、
12 下引層、
13 積層ユニット、
14 低屈折率層、
15 高屈折率層、
16 樹脂接着層、
17 ハードコート層、
18 透明接着層、
19 基体、
L 太陽光。
Claims (6)
- 基材上に、高屈折率層および低屈折率層を含む光反射層と、樹脂接着層と、ハードコート層と、がこの順に積層された光反射フィルムであって、
前記ハードコート層は、活性エネルギー線硬化樹脂を含み、
前記樹脂接着層が、ポリビニルアセタール樹脂、アクリル樹脂、およびウレタン樹脂からなる群から選択される少なくとも1種を含む、光反射フィルム。 - 前記樹脂接着層が、ポリビニルアセタール樹脂を含む、請求項1に記載の光反射フィルム。
- 前記ポリビニルアセタール樹脂のアセタール化率が、15~50mol%である、請求項2に記載の光反射フィルム。
- 前記樹脂接着層が、金属酸化物粒子をさらに含む、請求項1~3のいずれか1項に記載の光反射フィルム。
- 前記樹脂接着層が、ジルコニウム化合物をさらに含む、請求項1~4のいずれか1項に記載の光反射フィルム。
- 基体と、前記基体の少なくとも一方の面に配置された請求項1~5のいずれか1項に記載の光反射フィルムと、を含む、光反射体。
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JP7079053B2 (ja) | 2017-12-26 | 2022-06-01 | トヨタ紡織株式会社 | 遠赤外線反射フィルム |
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Also Published As
Publication number | Publication date |
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EP2881769A4 (en) | 2016-03-09 |
US20150219810A1 (en) | 2015-08-06 |
JPWO2014024873A1 (ja) | 2016-07-25 |
US9778402B2 (en) | 2017-10-03 |
EP2881769A1 (en) | 2015-06-10 |
CN104520737A (zh) | 2015-04-15 |
CN104520737B (zh) | 2017-02-22 |
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