WO2014069507A1 - 光学反射フィルム、赤外遮蔽フィルムおよびその製造方法 - Google Patents
光学反射フィルム、赤外遮蔽フィルムおよびその製造方法 Download PDFInfo
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- WO2014069507A1 WO2014069507A1 PCT/JP2013/079360 JP2013079360W WO2014069507A1 WO 2014069507 A1 WO2014069507 A1 WO 2014069507A1 JP 2013079360 W JP2013079360 W JP 2013079360W WO 2014069507 A1 WO2014069507 A1 WO 2014069507A1
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- PDXRQENMIVHKPI-UHFFFAOYSA-N cyclohexane-1,1-diol Chemical compound OC1(O)CCCCC1 PDXRQENMIVHKPI-UHFFFAOYSA-N 0.000 description 1
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- DCKVFVYPWDKYDN-UHFFFAOYSA-L oxygen(2-);titanium(4+);sulfate Chemical compound [O-2].[Ti+4].[O-]S([O-])(=O)=O DCKVFVYPWDKYDN-UHFFFAOYSA-L 0.000 description 1
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- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
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- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
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- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
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- 125000001302 tertiary amino group Chemical group 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 1
- 238000009283 thermal hydrolysis Methods 0.000 description 1
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- 150000003608 titanium Chemical class 0.000 description 1
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- 239000004408 titanium dioxide Substances 0.000 description 1
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- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- IIBYPFWXQQDGFC-UHFFFAOYSA-N trimethyl-[2-(2-methylprop-2-enoylamino)propyl]azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC(C)NC(=O)C(C)=C IIBYPFWXQQDGFC-UHFFFAOYSA-N 0.000 description 1
- LMRVIBGXKPAZLP-UHFFFAOYSA-N trimethyl-[2-methyl-2-(prop-2-enoylamino)propyl]azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC(C)(C)NC(=O)C=C LMRVIBGXKPAZLP-UHFFFAOYSA-N 0.000 description 1
- GHVWODLSARFZKM-UHFFFAOYSA-N trimethyl-[3-methyl-3-(prop-2-enoylamino)butyl]azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CCC(C)(C)NC(=O)C=C GHVWODLSARFZKM-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
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- 238000004804 winding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- 235000010493 xanthan gum Nutrition 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
- 239000004711 α-olefin Chemical group 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
- G02B5/281—Interference filters designed for the infrared light
- G02B5/282—Interference filters designed for the infrared light reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/26—Reflecting filters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/67—Particle size smaller than 100 nm
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
-
- 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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
Definitions
- the present invention relates to an optical reflection film, an infrared shielding film, and a manufacturing method thereof.
- heat insulating glass having infrared shielding properties has been adopted in architectural glass and vehicle glass for the purpose of shielding solar radiation energy entering a room or in a vehicle and reducing temperature rise and cooling load.
- an infrared shielding film formed by laminating layers having different refractive indexes is conventionally known, and a method of blocking the transmission of heat rays in sunlight by pasting this infrared shielding film on glass.
- it is attracting attention as a simpler method.
- the infrared shielding film there is a method in which a laminated film in which a high refractive index layer and a low refractive index layer are alternately laminated is produced by a vapor deposition method such as vapor deposition or sputtering.
- a vapor deposition method such as vapor deposition or sputtering.
- the vapor deposition method has problems such as high manufacturing cost, difficulty in increasing the area, and limitation to heat-resistant materials.
- liquid-phase film forming methods when using a coating method, a method of producing a laminated film of two or more layers on a substrate by coating, sequential coating in which each layer is coated and dried and laminated, There is a simultaneous multi-layer application where the layers are applied. Sequential coating includes spin coating, bar coating, blade coating, gravure coating, etc., but when creating a multilayer film such as an infrared reflection film, productivity is low because the number of coating and drying increases. .
- simultaneous multilayer coating there is a method using curtain coating, slide bead coating or the like, and a plurality of layers can be formed at the same time, so that productivity is high.
- the coating film obtained by multilayer coating is more likely to cause mixing between adjacent layers and disturbance (unevenness) of the interface.
- the coating film obtained by simultaneous multilayer coating is stacked in an undried liquid state, mixing between adjacent layers and interface disturbance (unevenness) are more likely to occur.
- moderate interlayer mixing has a good effect on the adhesion and optical characteristics of the film.
- the disturbance of the interface becomes large, it causes haze, which is not preferable.
- streaks may occur at the time of coating, or point-like failures may occur, which is problematic in terms of coating properties.
- the present invention has been made in view of the above circumstances, and the object of the present invention is to control the inter-layer mixing level even in the case of manufacturing by multi-layer coating, particularly simultaneous multi-layer coating with high production efficiency. By suppressing, it is providing the optical reflective film and infrared shielding film which are excellent in the light reflectivity of a desired wavelength, and have few hazes.
- Another object of the present invention is an optical reflective film in which the stability and applicability of the coating solution is good, and even when simultaneous multilayer coating is performed, coating streaks and point-like failures during coating are reduced, and It is providing the manufacturing method of an infrared shielding film.
- One object of the present invention is achieved by adopting the following configuration.
- the present invention provides an optical reflective film comprising at least one unit in which a high refractive index layer and a low refractive index layer are laminated on a substrate, wherein the low refractive index layer is a silica adsorbed with silanol-modified polyvinyl alcohol.
- An optical reflection film comprising fine particles.
- one object of the present invention is achieved by adopting the following configuration.
- a step of preparing a coating solution for low refractive index layer containing silica particles adsorbed with silanol-modified polyvinyl alcohol a step of preparing a coating solution for high refractive index layer containing metal oxide particles, and a step of alternately laminating the coating solution for the low refractive index layer and the coating solution for the high refractive index layer by simultaneous multilayer coating.
- One embodiment of the present invention is an infrared shielding film including at least one unit in which a high refractive index layer and a low refractive index layer are laminated on a substrate, wherein the low refractive index layer adsorbs silanol-modified polyvinyl alcohol. It is an optical reflection film characterized by containing the silica fine particles. Also, a preferred embodiment of the present invention is an infrared shielding film including at least one unit in which a high refractive index layer and a low refractive index layer are laminated on a substrate, wherein the low refractive index layer is silanol-modified. It is an infrared shielding film containing silica fine particles adsorbing polyvinyl alcohol.
- the configuration of the present invention improves the stability of the coating solution and the coating property of the coating solution to the lower layer, and further suppresses interlayer mixing between adjacent layers of the obtained laminate, resulting in high optical reflectance.
- An optical reflection film having high transparency can be obtained.
- the coating film obtained by multilayer coating tends to cause mixing between adjacent layers and disorder (unevenness) of the interface.
- sequential multilayer coating when the upper layer coating solution is applied, the lower layer formed is redissolved, the upper layer and lower layer liquids are mixed together, and mixing between adjacent layers and interface disturbance (unevenness) occur. May occur.
- the coating film obtained by simultaneous multilayer coating is stacked in an undried liquid state, mixing between adjacent layers and interface disturbance (unevenness) are more likely to occur. If the interlayer mixing is too large, haze is lowered, which is not preferable. Therefore, it is necessary to reduce the disturbance of the interface.
- the film obtained by multilayer coating particularly by simultaneous multilayer coating, has a low haze value and a highly transparent film can be obtained. There was found. This is considered to be due to the suppression of interlayer mixing between the upper layer and the lower layer.
- the silanol-modified polyvinyl alcohol When the silanol-modified polyvinyl alcohol is adsorbed on the silica particles, the particle size of the whole particles is increased, and the movement of the particles in the layer is suppressed. For this reason, it is considered that interfacial mixing between adjacent layers is suppressed. In addition, it is presumed that when the silanol group in the silanol-modified polyvinyl alcohol and the hydrogen bond network between the silica particles are strongly formed, the movement of the silica particles in the layer is suppressed and the interfacial mixing is reduced.
- the low refractive index layer contains a water-soluble polymer as a binder resin, the formation of a strong network between the polyvinyl alcohol and the water-soluble polymer in the silanol-modified polyvinyl alcohol further suppresses the movement of silica particles, It is presumed that the interfacial mixing becomes smaller.
- the stability of the coating solution used in the production of the low refractive index layer is improved, and a large area film is formed. It has been found that the coating liquid can be applied uniformly and with few coating failures (coating streaks and point-like failures) even in the case of production. This is presumably because the stability of the coating liquid used for coating is improved, and accordingly, the occurrence of failure during coating is improved. It is considered that the interface failure between adjacent layers becomes more uniform and the haze is further reduced due to less coating failure.
- X to Y indicating a range means “X or more and Y or less”, “weight” and “mass”, “weight%” and “mass%”, “part by weight” and “part by weight” Is treated as a synonym. Unless otherwise specified, measurement of operation and physical properties is performed under conditions of room temperature (20 to 25 ° C.) / Relative humidity 40 to 50%.
- infrared shielding film means a film that can block all or part of infrared rays by reflecting or absorbing infrared rays, preferably near infrared rays having a wavelength of about 700 nm to 2500 nm. It is.
- a refractive index layer having a higher refractive index than the other is referred to as a high refractive index layer
- a refractive index layer having a lower refractive index than the other is referred to as a low refractive index layer. Therefore, the terms “high refractive index layer” and “low refractive index layer” are the same when each refractive index layer constituting the optical reflective film is focused on two adjacent refractive index layers. All forms other than those having a refractive index are included.
- ⁇ Low refractive index layer> Silica particles adsorbed with silanol-modified polyvinyl alcohol (hereinafter also referred to as adsorbed silica particles)]
- the silica particles constituting the adsorbed silica particles preferably have an average particle size of 3 to 50 nm, more preferably 3 to 40 nm, particularly preferably 3 to 20 nm, and 4 to 10 nm. Is most preferred. Use of silica particles in such a range is preferable in that an optical reflection film having little haze and excellent visible light transmittance can be obtained.
- the average particle diameter of the silica particles is a volume average particle diameter measured by a dynamic light scattering method (measuring device: Zetasizer Nano-S (Malvern)) on silica particles to which silanol-modified polyvinyl alcohol is not adsorbed.
- Silica particles in the following aqueous silica sol can be measured for volume average particle size in a dispersed state in the sol.
- measurement method by the dynamic light scattering method measurement is performed without distinction between primary and secondary particles, and thus the average particle size here is the average particle size of particles such as primary, secondary, and aggregates. .
- the degree of polymerization of the silanol-modified polyvinyl alcohol is usually 300 to 2,500, preferably 500 to 1,700. When the degree of polymerization is 300 or more, the strength of the coating layer is high, and when the degree of polymerization is 2,500 or less, the viscosity of the coating solution does not become excessively high and is suitable for process.
- the modification rate of the silanol-modified polyvinyl alcohol is usually 0.01 to 5 mol%, preferably 0.1 to 1 mol%.
- Silanol-modified polyvinyl alcohol used for adsorption may be used alone or in combination of two or more.
- silanol-modified polyvinyl alcohol is adsorbed on silica particles can be easily determined by measuring the average particle diameter. Specifically, the average particle size of silica particles adsorbed with silanol-modified polyvinyl alcohol and silica particles not adsorbed with silanol-modified polyvinyl alcohol are compared. It can be confirmed that silanol-modified polyvinyl alcohol is adsorbed on the surface.
- adsorption here means the state which silanol modified polyvinyl alcohol has adhered to at least one part of the surface of a silica particle. That is, the surface of the silica particles may be completely coated with silanol-modified polyvinyl alcohol, or a part of the surface of the silica particles may be coated with silanol-modified polyvinyl alcohol.
- the average particle size of the silica particles adsorbed with silanol-modified polyvinyl alcohol is preferably 2 to 30 times the average particle size of silica particles not adsorbed with silanol-modified polyvinyl alcohol, and preferably 3 to 16 times. .
- the average particle size of silica particles adsorbed with silanol-modified polyvinyl alcohol is 20 to 80 nm. Preferably there is.
- the average particle size of the adsorbed silica particles is 20 nm or more, the silanol-modified polyvinyl alcohol is appropriately adsorbed and the haze value is reduced, so that the film characteristics are improved and there are more application failures such as application stripes and point failures. Reduced.
- the average particle diameter is a volume average particle diameter obtained by measuring a dispersion of silica particles adsorbed with silanol-modified polyvinyl alcohol by a dynamic light scattering method (measuring device: Zetasizer Nano-S (Malvern)).
- the dispersion medium in the dispersion at the time of particle size measurement is an aqueous dispersion medium, preferably water, and the sample concentration is 2 to 10% by weight (solid content).
- the dispersion liquid at the time of measuring the said average particle diameter is measured at 25 degreeC.
- silica particles adsorbed with silanol-modified polyvinyl alcohol are preferably formed by mixing an aqueous silica sol and a silanol-modified polyvinyl alcohol solution and heating. Silica particles thus obtained are preferred because they are in a state where silanol-modified polyvinyl alcohol is stably adsorbed.
- the aqueous silica sol is not particularly limited, and may be synthesized by a known method or may be a commercially available product.
- the aqueous silica sol refers to colloidal silica (also called colloidal silica or colloidal silicic acid) in which silica particles are dispersed in an aqueous dispersion medium.
- the aqueous dispersion medium refers to a dispersion medium containing 80% by weight or more of water, preferably 95% by weight or more, and more preferably 100% by weight of water.
- components other than water include lower alcohols having 1 to 3 carbon atoms, alcohols such as 2-propanol and 1-butanol, ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, propylene Esters such as glycol monoethyl ether acetate, ethers such as diethyl ether, propylene glycol monomethyl ether and ethylene glycol monoethyl ether, amides such as dimethylformamide and N-methylpyrrolidone, ketones such as acetone, methyl ethyl ketone, acetylacetone and cyclohexanone
- the lower alcohol is preferable.
- a method for preparing an aqueous silica sol a method using an alkali metal silicate such as potassium silicate or sodium silicate as a raw material, and a method of hydrolyzing an alkoxysilane such as tetramethoxysilane or tetraethoxysilane Etc.
- an alkali metal silicate such as potassium silicate or sodium silicate
- an alkoxysilane such as tetramethoxysilane or tetraethoxysilane Etc.
- JP 4-93284 JP 5-278324, JP 6-92011, JP 6-183134, JP 6-297830, JP 7-7. 81214, JP-A-7-101142, JP-A-7-179029, JP-A-7-137431, and International Publication No. 94/26530.
- an alkali metal silicate such as sodium silicate
- metathesis by an acid such as hydrochloric acid or sulfuric acid, or a counter ion is a hydrogen ion (H + ).
- an alkali metal atom in an alkali metal silicate salt is replaced with a hydrogen atom using a cation exchange resin.
- a method for preparing silica sol by metathesis of the acid or the like a method of adding an aqueous solution of alkali metal silicate to an aqueous solution of acid while stirring the aqueous solution, or an aqueous solution of acid and an alkali metal silicate salt
- a method in which the aqueous solution is collided and mixed in a pipe see, for example, Japanese Patent Publication No. 4-54619.
- the method of preparing a silica sol using an acid type cation exchange resin can also be performed by a well-known method.
- the amount of the acid type cation exchange resin to be used needs to be equal to or more than the amount capable of exchanging the alkali metal contained in the solution.
- said acid type cation exchange resin a well-known thing can be especially used without a restriction
- a styrene-based, acrylic-based, methacryl-based or the like ion-exchange resin having a sulfonic acid group or a carboxyl group as an ion-exchange group can be used.
- a so-called strong acid type cation exchange resin having a sulfonic acid group can be suitably used.
- aqueous silica sol As the aqueous silica sol, a commercially available product may be used. As a commercially available product, the Snowtex series (Snowtex 20, Snowtex 30, Snowtex 40, Snowtex O, Snowtex, etc.) sold by Nissan Chemical Industries, Ltd. may be used. OS, Snowtex OXS, Snowtex XS, Snowtex O-40, Snowtex C, Snowtex N, Snowtex S, Snowtex 20L, Snowtex OL).
- the solvent for preparing the silanol-modified polyvinyl alcohol solution is not particularly limited, but water, an organic solvent, or a mixed solvent thereof is preferable. In consideration of environmental aspects due to the scattering of the organic solvent, water or a mixed solvent of water and a small amount of an organic solvent is more preferable, and water is particularly preferable.
- the organic solvent examples include alcohols such as methanol, ethanol, 2-propanol and 1-butanol, esters such as ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate and propylene glycol monoethyl ether acetate, diethyl ether, Examples thereof include ethers such as propylene glycol monomethyl ether and ethylene glycol monoethyl ether, amides such as dimethylformamide and N-methylpyrrolidone, and ketones such as acetone, methyl ethyl ketone, acetylacetone and cyclohexanone. These organic solvents may be used alone or in combination of two or more. From the viewpoint of environment and simplicity of operation, the solvent of the coating solution is preferably water or a mixed solvent of water and methanol, ethanol, or ethyl acetate, and more preferably water.
- the content of water in the mixed solvent is preferably 80 to 99.9% by weight, based on 100% by weight of the entire mixed solvent, and preferably 90 to 99%. More preferably, it is 5% by weight.
- it is 80% by weight or more, volume fluctuation due to volatilization of the solvent can be reduced, handling is improved, and when it is 99.9% by weight or less, homogeneity at the time of liquid addition is increased and stable. This is because the obtained liquid properties can be obtained.
- the silanol-modified polyvinyl alcohol solution may contain only one kind of silanol-modified polyvinyl alcohol or may contain two or more kinds of silanol-modified polyvinyl alcohol.
- the concentration of the silanol-modified polyvinyl alcohol in the silanol-modified polyvinyl alcohol solution is preferably 2 to 10% by weight with respect to the total amount of the solution from the viewpoints of workability, solubility and solution stability.
- a heating treatment is performed.
- silanol-modified polyvinyl alcohol molecules are adsorbed on the silica particles.
- the heating condition at this time is not particularly limited because it is appropriately set so that the adsorption is appropriately performed.
- the heating temperature is preferably 30 to 70 ° C., more preferably 40 to 60 ° C. Such temperature conditions are preferable because adsorption is appropriately performed and aggregation of particles is suppressed.
- the heating time is preferably 30 to 300 minutes, more preferably 60 to 180 minutes.
- the content of the silanol-modified polyvinyl alcohol adsorbing silica particles in the low refractive index layer is preferably 15 to 85% by weight, and 20 to 80% by weight with respect to 100% by weight of the total solid content of the low refractive index layer. More preferably, it is more preferably 30 to 75% by weight. By setting it as the said range, it can be set as the favorable optical reflection characteristic (especially infrared shielding).
- the low refractive index layer may contain metal oxide particles (for example, silica particles) other than the adsorbed silica particles, a binder resin, a curing agent, a surfactant, and various additives, if necessary.
- metal oxide particles for example, silica particles
- the high refractive index layer is not particularly limited as long as the refractive index layer is higher than that of the low refractive index layer.
- the high refractive index layer contains metal oxide particles. Is preferred.
- the metal oxide particles contained in the high refractive index layer are preferably metal oxide particles different from the low refractive index layer in order to cause a refractive index difference.
- metal oxide particles used in the high refractive index layer examples include titanium oxide, zirconium oxide, zinc oxide, alumina, colloidal alumina, niobium oxide, europium oxide, and zircon.
- the metal oxide may be used alone or in combination of two or more.
- the high refractive index layer preferably contains titanium oxide or zirconium oxide having a high refractive index. That is, in a preferred embodiment of the present invention, the high refractive index layer includes at least one of titanium oxide and zirconium oxide. Since the infrared reflectance can be further improved, it is more preferable that the high refractive index layer contains at least titanium oxide. Further, it is more preferable to contain rutile (tetragonal) titanium oxide particles having a volume average particle diameter of 100 nm or less. A plurality of types of titanium oxide particles may be mixed.
- the metal oxide particles contained in the low refractive index layer and the metal oxide particles contained in the high refractive index layer may be in a state of having ionicity (that is, electric charges have the same sign).
- ionicity that is, electric charges have the same sign.
- the ionicity is different, it reacts at the interface to form aggregates and haze deteriorates.
- aligning ionicity for example, as described later, it is possible to anionize titanium oxide by treating it with a silicon-containing hydrated oxide.
- the average particle diameter (number average) of the metal oxide particles contained in the high refractive index layer is preferably 3 to 100 nm, and more preferably 3 to 50 nm.
- the average particle size (number average) is simply determined by observing particles themselves or particles appearing on the cross section or surface of the refractive index layer with an electron microscope and measuring the particle size of 1,000 arbitrary particles. It is obtained as an average value (number average).
- the particle diameter of each particle is represented by a diameter assuming a circle equal to the projected area.
- the content of the metal oxide particles in the high refractive index layer is preferably 15 to 85% by weight and preferably 20 to 80% by weight with respect to 100% by weight of the total solid content of the high refractive index layer. More preferably, it is 30 to 75% by weight. By setting it as the said range, it can be set as the favorable optical reflection characteristic (especially infrared shielding).
- titanium oxide particles it is preferable to use particles obtained by modifying the surface of an aqueous titanium oxide sol so that it can be dispersed in an organic solvent or the like.
- 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.
- titanium oxide particles are used as the metal oxide particles
- other methods for producing titanium oxide particles are described in, for example, “Titanium oxide—physical properties and applied technologies” Manabu Seino, p. 255-258 (2000) Gihodo Publishing Co., Ltd., or WO2007.
- titanium dioxide hydrate is treated with at least one basic compound selected from the group consisting of alkali metal hydroxides or alkaline earth metal hydroxides.
- the titanium dioxide dispersion obtained comprises a step (2) of treating with a carboxylic acid group-containing compound and an inorganic acid.
- the metal oxide particles contained in the high refractive index layer are preferably in the form of core-shell particles in which titanium oxide particles are coated with a silicon-containing hydrated oxide.
- the volume average particle diameter of the titanium oxide particles as the core part is preferably more than 1 nm and less than 40 nm, more preferably 4 nm or more and less than 40 nm, and the surface of the titanium oxide particles is used as the core of titanium oxide.
- This is a structure in which a shell made of silicon-containing hydrated oxide is coated so that the amount of silicon-containing hydrated oxide is 3 to 30% by weight as SiO 2 with respect to 100% by weight.
- the volume average particle diameter of the titanium oxide particles refers to a method of observing the particles themselves using a laser diffraction scattering method, a dynamic light scattering method, or an electron microscope, or particles appearing on the cross section or surface of the refractive index layer.
- the particle diameter of 1,000 arbitrary particles is measured by a method of observing an image with an electron microscope, and particles having particle diameters of d1, d2,.
- the volume average particle diameter mv ⁇ (vi ⁇ di) ⁇ / ⁇ ( vi) ⁇ is an average particle size weighted by a volume.
- the titanium 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 silicon-containing hydrated oxide may be either a hydrate of an inorganic silicon compound, a hydrolyzate of an organic silicon compound, and / or a condensate. More preferably. Therefore, in the present invention, the metal oxide particles contained in the high refractive index layer are preferably silica-modified (silanol-modified) titanium oxide particles in which the titanium oxide particles are silica-modified.
- the coating amount of the silicon-containing hydrated compound of titanium oxide is 3 to 30% by weight, preferably 3 to 10% by weight, more preferably 3 to 8% by weight with respect to 100% by weight of titanium oxide. This is because when the coating amount is 30% by weight or less, the desired refractive index of the high refractive index layer can be obtained, and when the coating amount is 3% or more, particles can be stably formed.
- core-shell particles produced by a known method can be used as the metal oxide particles contained in the high refractive index layer.
- core-shell particles produced by a known method can be used.
- the following (i) to (iv); (i) an aqueous solution containing titanium oxide particles is heated and hydrolyzed, or an aqueous solution containing titanium oxide particles is neutralized by adding an alkali to obtain an average particle size.
- the titanium oxide particles and the mineral acid were mixed so that the molar ratio of titanium oxide particles / mineral acid was in the range of 1 / 0.5 to 1/2.
- the slurry is heat-treated at a temperature not lower than the boiling point of the slurry and not higher than the boiling point of the slurry, and then a silicon compound (for example, an aqueous sodium silicate solution) is added to the obtained slurry containing the titanium oxide particles.
- a silicon compound for example, an aqueous sodium silicate solution
- a method of neutralizing by mixing a titanium oxide sol stabilized at a pH in an acidic range obtained by peptizing a monobasic acid or a salt thereof with an alkyl silicate as a dispersion stabilizer by a conventional method (Iii) Hydrogen peroxide and metallic tin are simultaneously or alternately kept in a mixed aqueous solution of a titanium salt (eg, titanium tetrachloride) while maintaining a molar ratio of H 2 O 2 / Sn of 2 to 3 Addition to form a basic salt aqueous solution containing titanium, and hold the basic salt aqueous solution at a temperature of 50 to 100 ° C.
- a titanium salt eg, titanium tetrachloride
- a stable aqueous sol of composite colloidal particles containing silicon dioxide is produced by preparing an aqueous solution containing selenium and removing cations present in the aqueous solution; the resulting composite aqueous sol containing titanium oxide 100 parts by weight in terms of metal oxide TiO 2 and 2 to 100 parts by weight of the resulting composite aqueous sol containing silicon dioxide in terms of metal oxide SiO 2 are mixed to remove anions.
- the core-shell particles may be those in which the entire surface of the titanium oxide particles as a core is coated with a silicon-containing hydrated oxide, and a part of the surface of the titanium oxide particles as a core is covered with a silicon-containing hydrated oxide. It may be coated with.
- the high refractive index layer may contain a binder resin, a curing agent, a surfactant, and various additives as necessary.
- the binder resin the curing agent, the surfactant, and various additives that are optionally included in the low refractive index layer and the high refractive index layer will be described.
- the binder resin is a dispersion medium of a dispersion such as metal oxide particles, and has a weight average molecular weight of 1,000 to 200,000 (preferably 3,000 to 60,000). Means a molecular compound.
- the weight average molecular weight can be measured by a known method, and can be measured by, for example, a static light scattering method, a gel permeation chromatograph method (GPC), or TOFMASS.
- the binder resin is preferably contained in the range of 5 wt% or more and 75 wt% or less with respect to 100 wt% of the solid content of the refractive index layer, and is contained in the range of 10 wt% or more and 70 wt% or less. It is more preferable. However, for example, when an emulsion resin is used in combination, the content may be 3% by weight or more. When the amount of the binder resin is small, there is a greater tendency for the film surface to be disturbed and the transparency to deteriorate during drying after coating the refractive index layer. On the other hand, if the content is 75% by weight or less, the relative content of the metal oxide becomes appropriate, and it becomes easy to increase the difference in refractive index between the high refractive index layer and the low refractive index layer.
- the binder resin preferably contains a water-soluble polymer.
- at least the low refractive index layer preferably contains a water-soluble polymer as a binder resin. That is, a preferred embodiment of the present invention is an optical reflection film in which the low refractive index layer contains a water-soluble polymer. Since the water-soluble polymer has good compatibility with the silanol-modified polyvinyl alcohol adsorbed on the silica particles, when the water-soluble polymer is used as a binder resin, a stable coating solution can be prepared, and multilayer coating, particularly simultaneously This is because the multilayer coating can be easily performed.
- the water-soluble polymer is filtered through a G2 glass filter (maximum pores 40-50 ⁇ m) when dissolved in water at a concentration of 0.5% by weight at the temperature at which the water-soluble polymer is most dissolved.
- the weight of the insoluble matter filtered off is within 50% by weight of the added water-soluble polymer.
- water-soluble polymer examples include a polymer having a reactive functional group, gelatin, or a thickening polysaccharide. These water-soluble polymers may be used alone or in combination of two or more.
- the water-soluble polymer may be a synthetic product or a commercial product.
- Polymer having reactive functional group examples include polyvinyl alcohols, polyvinylpyrrolidones, polyacrylic acid, acrylic acid-acrylonitrile copolymer, potassium acrylate-acrylonitrile copolymer, vinyl acetate-acrylic ester copolymer.
- Acrylic resin such as 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 or styrene- ⁇ -methylstyrene-acrylic acid-acrylic acid ester copolymer, styrene-sodium styrenesulfonate copolymer, styrene-2-hydroxyethyl acrylate Copolymer Styrene-2-hydroxyethyl acrylate-potassium styrene sulfonate copolymer, styrene-maleic acid copolymer, styrene-maleic anhydride copolymer, vinyl naphthalate
- polyvinyl alcohol is particularly preferably used as the binder resin. Below, polyvinyl alcohol is demonstrated.
- the polyvinyl alcohol preferably used in the present invention includes various modified polyvinyl alcohols in addition to normal polyvinyl alcohol obtained by hydrolyzing polyvinyl acetate.
- the polyvinyl alcohol obtained by hydrolyzing vinyl acetate preferably has an average degree of polymerization of 1,000 or more, and particularly preferably has an average degree of polymerization of 1,500 to 5,000.
- the degree of saponification is preferably 70 to 100 mol%, particularly preferably 80 to 99.5 mol%.
- modified polyvinyl alcohol examples include cation-modified polyvinyl alcohol, anion-modified polyvinyl alcohol, nonion-modified polyvinyl alcohol, and vinyl alcohol polymers.
- Anion-modified polyvinyl alcohol is described in, for example, polyvinyl alcohol having an anionic group as described in JP-A-1-206088, JP-A-61-237681 and JP-A-63-307979.
- examples thereof include a copolymer of vinyl alcohol and a vinyl compound having a water-soluble group, and a modified polyvinyl alcohol having a water-soluble group as described in JP-A-7-285265.
- Nonionic modified polyvinyl alcohol includes, for example, a polyvinyl alcohol derivative in which a polyalkylene oxide group is added to a part of vinyl alcohol as described in JP-A-7-9758, and JP-A-8-25795.
- Block copolymer of vinyl compound having a hydrophobic group and vinyl alcohol, silanol-modified polyvinyl alcohol having silanol group, reactive group modification having reactive group such as acetoacetyl group, carbonyl group, carboxyl group Polyvinyl alcohol etc. are mentioned.
- 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.
- Examples of the ethylenically unsaturated monomer having a cationic group include trimethyl- (2-acrylamido-2,2-dimethylethyl) ammonium chloride and trimethyl- (3-acrylamido-3,3-dimethylpropyl) ammonium chloride.
- the ratio of the cation-modified group-containing monomer in the cation-modified polyvinyl alcohol is 0.1 to 10 mol%, preferably 0.2 to 5 mol%, relative to vinyl acetate.
- vinyl alcohol polymer examples include EXEVAL (trade name: manufactured by Kuraray Co., Ltd.) and Nichigo G polymer (trade name: manufactured by Nippon Synthetic Chemical Industry Co., Ltd.).
- Polyvinyl alcohol can be used in combination of two or more types, such as the degree of polymerization and the type of modification.
- gelatin As gelatin, various types of gelatin that have been widely used in the field of silver halide photographic light-sensitive materials can be applied. For example, in addition to acid-processed gelatin and alkali-processed gelatin, enzyme processing is performed in the gelatin manufacturing process. Enzyme-treated gelatin and gelatin derivatives, that is, modified by treatment with a reagent having an amino group, an imino group, a hydroxyl group, or a carboxyl group as a functional group in the molecule and a group obtained by reaction with it may be used. Well-known methods for producing gelatin are well known. H. James: The Theory of Photographic Process 4th. ed.
- Gelatin Hardener When gelatin is used, a gelatin hardener can be added as necessary.
- hardener known compounds that are used as hardeners for ordinary photographic emulsion layers can be used.
- vinyl sulfone compounds urea-formalin condensates, melanin-formalin condensates, epoxy compounds And organic hardeners such as aziridine compounds, active olefins and isocyanate compounds, and inorganic polyvalent metal salts such as chromium, aluminum and zirconium.
- a water-soluble cellulose derivative can be preferably used, for example, a water-soluble cellulose derivative such as carboxymethyl cellulose (cellulose carboxymethyl ether), methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, or a carboxylic acid group.
- a water-soluble cellulose derivative such as carboxymethyl cellulose (cellulose carboxymethyl ether), methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, or a carboxylic acid group.
- carboxymethyl cellulose (cellulose carboxymethyl ether), carboxyethyl cellulose and the like which are contained celluloses.
- Other examples include cellulose derivatives such as nitrocellulose, cellulose acetate propionate, cellulose acetate, and cellulose sulfate.
- the thickening polysaccharide is not particularly limited, and examples thereof include generally known natural simple polysaccharides, natural complex polysaccharides, synthetic simple polysaccharides, and synthetic complex polysaccharides. Details of these polysaccharides Can refer to “Biochemical Encyclopedia (2nd edition), Tokyo Chemical Doujin Publishing”, “Food Industry”, Vol. 31 (1988), p. 21.
- Thickening polysaccharide is a polymer of saccharides and has many hydrogen bonding groups in the molecule. Due to the difference in hydrogen bonding strength between molecules depending on the temperature, the viscosity difference at low temperature and the viscosity at high temperature are large. When the metal oxide fine particles are further added, the viscosity is increased due to hydrogen bonding with the metal oxide fine particles at a low temperature.
- a polysaccharide having a viscosity at 15 ° C. of 1.0 mPa ⁇ s or higher, preferably 5.0 mPa ⁇ s or higher, more preferably 10.0 mPa ⁇ s or higher. is there.
- thickening polysaccharide examples include galactan (eg, agarose, agaropectin, etc.), galactomannoglycan (eg, locust bean gum, guaran, etc.), xyloglucan (eg, tamarind gum, etc.), glucomannoglycan (eg, , Mannan, wood-derived glucomannan, xanthan gum, etc.), galactoglucomannoglycan (for example, softwood-derived glycan), arabinogalactoglycan (for example, soybean-derived glycan, microorganism-derived glycan, etc.), glucamnoglycan (for example, , Gellan gum, etc.), glycosaminoglycans (eg, hyaluronic acid, keratan sulfate, etc.), alginic acid and alginates, agar, ⁇ -carrageenan, ⁇ -carrageenan, ⁇
- the structural unit does not have a carboxylic acid group or a sulfonic acid group.
- thickening polysaccharides include pentoses such as L-arabitose, D-ribose, 2-deoxyribose and D-xylose, and hexoses such as D-glucose, D-fructose, D-mannose and D-galactose. It is preferable that it is a polysaccharide which consists only of.
- tamarind seed gum known as xyloglucan whose main chain is glucose and side chain is glucose
- guar gum known as galactomannan whose main chain is mannose and side chain is glucose
- cationized guar gum Hydroxypropyl guar gum
- locust bean gum locust bean gum
- tara gum arabinogalactan whose main chain is galactose and whose side chain is arabinose
- tamarind, guar gum, cationized guar gum, and hydroxypropyl guar gum are particularly preferable.
- a curing agent can also be used to cure the water-soluble polymer.
- the curing agent is not particularly limited as long as it causes a curing reaction with the water-soluble polymer.
- boric acid and its salt are preferable as the curing agent.
- known ones can be used, and in general, a compound having a group capable of reacting with polyvinyl alcohol or a compound that promotes the reaction between different groups possessed by polyvinyl alcohol. Select and use.
- the curing agent include, for example, epoxy curing agents (diglycidyl ethyl ether, ethylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-diglycidyl cyclohexane, N, N-diglycidyl- 4-glycidyloxyaniline, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, etc.), aldehyde curing agents (formaldehyde, glioxal, etc.), active halogen curing agents (2,4-dichloro-4-hydroxy-1,3,5) , -S-triazine, etc.), active vinyl compounds (1,3,5-trisacryloyl-hexahydro-s-triazine, bisvinylsulfonylmethyl ether, etc.), aluminum alum, borax and the like.
- epoxy curing agents diglycidyl e
- Boric acid or a salt thereof refers to an oxygen acid having a boron atom as a central atom and a salt thereof, specifically, orthoboric acid, diboric acid, metaboric acid, tetraboric acid, pentaboric acid, and octaboron. Examples include acids and their salts.
- Boric acid having a boron atom and a salt thereof as a curing agent may be used alone or in a mixture of two or more. Particularly preferred is a mixed aqueous solution of boric acid and borax.
- An aqueous solution of boric acid and borax can be added only in a relatively dilute aqueous solution, but a thick aqueous solution can be obtained by mixing the two, and the coating solution can be concentrated. Further, there is an advantage that the pH of the aqueous solution to be added can be controlled relatively freely.
- the curing agent it is preferable to use at least one of boric acid and its salts and borax.
- at least one of boric acid and its salts and borax is used, metal oxide particles and water-soluble polymer polyvinyl alcohol OH groups and hydrogen bonding networks are more easily formed, resulting in a high refractive index. It is considered that interlayer mixing between the layer and the low refractive index layer is suppressed, and preferable optical reflection characteristics are achieved.
- the film surface temperature of the coating film is once cooled to about 15 ° C., and then the set surface coating process is used to dry the film surface. Can express an effect more preferably.
- the content of the curing agent in the refractive index layer is preferably 1 to 10% by weight and more preferably 2 to 6% by weight with respect to 100% by weight of the solid content of the refractive index layer.
- the total amount of the curing agent used is preferably 1 to 600 mg per 1 g of polyvinyl alcohol, more preferably 100 to 600 mg per 1 g of polyvinyl alcohol.
- Each refractive index layer preferably contains a surfactant from the viewpoint of coatability.
- anionic surfactant a nonionic surfactant, an amphoteric surfactant, and the like can be used as the surfactant used for adjusting the surface tension during coating, but an anionic surfactant is more preferable.
- Preferable compounds include those containing a hydrophobic group having 8 to 30 carbon atoms and a sulfonic acid group or a salt thereof in one molecule.
- Anionic surfactants include alkyl benzene sulfonate, alkyl naphthalene sulfonate, alkane or olefin sulfonate, alkyl sulfate ester salt, polyoxyethylene alkyl or alkyl aryl ether sulfate ester, alkyl phosphate, alkyl diphenyl ether
- a surfactant selected from the group consisting of disulfonates, ether carboxylates, alkylsulfosuccinic acid ester salts, ⁇ -sulfo fatty acid esters and fatty acid salts, condensates of higher fatty acids with amino acids, naphthenic acid salts, etc. may be used.
- Anionic surfactants preferably used are alkylbenzene sulfonates (especially those of linear alkyls), alkanes or olefin sulfonates (especially secondary alkane sulfonates, ⁇ -olefin sulfonates), alkyl sulfates Salts, polyoxyethylene alkyl or alkyl aryl ether sulfates (especially polyoxyethylene alkyl ether sulfates), alkyl phosphates (especially monoalkyl type), ether carboxylates, alkyl sulfosuccinates, ⁇ -sulfo fatty acid esters and A surfactant selected from the group consisting of fatty acid salts, and alkylsulfosuccinate is particularly preferable.
- the content of the surfactant in each refractive index layer is preferably 0.001 to 0.03% by weight, with the total weight of the coating liquid for the refractive index layer being 100% by weight, preferably 0.005 to 0.015. More preferably, it is% by weight.
- additives can be used for each refractive index layer as necessary.
- the content of the additive in each refractive index layer is preferably 0 to 20% by weight with respect to 100% by weight of the solid content of the refractive index layer. Examples of such additives are described below.
- amino acids with an isoelectric point of 6.5 or less By including an amino acid having an isoelectric point of 6.5 or less, the dispersibility of the metal oxide particles in the high refractive index layer or the low refractive index layer can be improved.
- an amino acid is a compound having an amino group and a carboxyl group in the same molecule, and may be any type of amino acid such as ⁇ -, ⁇ -, and ⁇ -.
- Some amino acids have optical isomers, but in the present invention, there is no difference in effect due to optical isomers, and any isomer can be used alone or in racemic form.
- preferred amino acids include aspartic acid, glutamic acid, glycine, serine, and the like, with glycine and serine being particularly preferred.
- the isoelectric point of an amino acid refers to this pH value because an amino acid balances the positive and negative charges in the molecule at a specific pH and the overall charge is zero.
- the isoelectric point of each amino acid can be determined by isoelectric focusing at a low ionic strength.
- Each refractive index layer may further contain an emulsion resin.
- the emulsion resin By including the emulsion resin, the flexibility of the film is increased and the workability such as sticking to glass is improved.
- An emulsion resin is a resin in which fine resin particles having an average particle diameter of about 0.01 to 2.0 ⁇ m, for example, are dispersed in an emulsion state in an aqueous medium. Obtained by emulsion polymerization using a molecular dispersant. There is no fundamental difference in the polymer component of the resulting emulsion resin depending on the type of dispersant used.
- the dispersant used in the polymerization of the emulsion include polyoxyethylene nonylphenyl ether in addition to low molecular weight dispersants such as alkylsulfonate, alkylbenzenesulfonate, diethylamine, ethylenediamine, and quaternary ammonium salt.
- Polymer dispersing agents such as polyoxyethylene lauryl ether, hydroxyethyl cellulose, and polyvinylpyrrolidone.
- emulsion polymerization is performed using a polymer dispersant having a hydroxyl group, the presence of hydroxyl groups is estimated on at least the surface of fine particles, and the emulsion resin polymerized using other dispersants has chemical and physical properties of the emulsion. Different.
- the polymer dispersant containing a hydroxyl group is a polymer dispersant having a weight average molecular weight of 10,000 or more, and has a hydroxyl group substituted at the side chain or terminal.
- an acrylic polymer such as sodium polyacrylate or polyacrylamide is used.
- examples of such polymers include 2-ethylhexyl acrylate copolymer, polyethers such as polyethylene glycol and polypropylene glycol, and polyvinyl alcohol. Polyvinyl alcohol is particularly preferable.
- Polyvinyl alcohol used as a polymer dispersant is an anion-modified polyvinyl alcohol having an anionic group such as a cation-modified polyvinyl alcohol or a carboxyl group in addition to ordinary polyvinyl alcohol obtained by hydrolysis of polyvinyl acetate. Further, modified polyvinyl alcohol such as silyl-modified polyvinyl alcohol having a silyl group is also included. Polyvinyl alcohol has a higher effect of suppressing the occurrence of cracks when forming the ink absorbing layer when the average degree of polymerization is higher, but when the average degree of polymerization is within 5000, the viscosity of the emulsion resin is not high, and at the time of production Easy to handle.
- the average degree of polymerization is preferably 300 to 5000, more preferably 1500 to 5000, and particularly preferably 3000 to 4500.
- the saponification degree of polyvinyl alcohol is preferably 70 to 100 mol%, more preferably 80 to 99.5 mol%.
- Examples of the resin that is emulsion-polymerized with the above polymer dispersant include homopolymers or copolymers of ethylene monomers such as acrylic acid esters, methacrylic acid esters, vinyl compounds, and styrene compounds, and diene compounds such as butadiene and isoprene.
- Examples of the polymer include acrylic resins, styrene-butadiene resins, and ethylene-vinyl acetate resins.
- each refractive index layer includes, for example, ultraviolet absorbers described in JP-A-57-74193, JP-A-57-87988, and JP-A-62-261476, and JP-A-57-74192. JP-A-57-87989, JP-A-60-72785, JP-A-61465991, JP-A-1-95091 and JP-A-3-13376, etc. No.
- optical brighteners sulfuric acid, phosphoric acid, acetic acid , Citric acid, sodium hydroxide, potassium hydroxide, potassium carbonate and other pH adjusters, antifoaming agents, diethylene glycol and other lubricants, preservatives, antistatic agents, It may contain various known additives such as agents.
- the thickness of the substrate that is the support of the optical reflection film is preferably 5 to 200 ⁇ m, more preferably 15 to 150 ⁇ m.
- the base material which concerns on this invention may be what piled up two sheets, and the kind may be the same or different in this case.
- the substrate applied to the optical reflection film is not particularly limited as long as it is transparent, and various resin films can be used.
- Polyolefin films polyethylene, polypropylene, etc.
- polyester films polyethylene terephthalate, polyethylene naphthalate). Phthalate, etc.
- polyvinyl chloride polyvinyl chloride
- cellulose acetate etc.
- it does not specifically limit as a polyester film (henceforth polyester), It is preferable that it is polyester which has the film formation property which has a dicarboxylic acid component and a diol component as main structural components.
- the main constituent dicarboxylic acid components include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, diphenylsulfone dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenylethanedicarboxylic acid, Examples thereof include cyclohexane dicarboxylic acid, diphenyl dicarboxylic acid, diphenyl thioether dicarboxylic acid, diphenyl ketone dicarboxylic acid, and phenylindane dicarboxylic acid.
- diol component examples include ethylene glycol, propylene glycol, tetramethylene glycol, cyclohexanedimethanol, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxyethoxyphenyl) propane, bis ( 4-Hydroxyphenyl) sulfone, bisphenol fluorene hydroxyethyl ether, diethylene glycol, neopentyl glycol, hydroquinone, cyclohexanediol and the like.
- polyesters having these as main components from the viewpoints of transparency, mechanical strength, dimensional stability, etc., dicarboxylic acid components such as terephthalic acid, 2,6-naphthalenedicarboxylic acid, diol components such as ethylene glycol and 1 Polyester having 1,4-cyclohexanedimethanol as the main constituent is preferred.
- polyesters mainly composed of polyethylene terephthalate and polyethylene naphthalate, copolymerized polyesters composed of terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol, and mixtures of two or more of these polyesters are mainly used. Polyester as a constituent component is preferable.
- the substrate preferably has a visible light region transmittance of 85% or more as shown in JIS R3106-1998, particularly preferably 90% or more. It is advantageous and preferable in that the transmittance of the visible light region shown in JIS R3106-1998 when the substrate is an optical reflection film is 50% or more when the substrate has the above transmittance.
- the base material using the resin or the like may be an unstretched film or a stretched film.
- a stretched film is preferable from the viewpoint of strength improvement and thermal expansion suppression.
- the base material can be manufactured by a conventionally known general method.
- an unstretched substrate that is substantially amorphous and not oriented can be produced by melting a resin as a material with an extruder, extruding it with an annular die or a T-die, and quenching.
- the unstretched base material is subjected to a known method such as uniaxial stretching, tenter-type sequential biaxial stretching, tenter-type simultaneous biaxial stretching, tubular-type simultaneous biaxial stretching, or the flow direction of the base material (vertical axis), or A stretched substrate can be produced by stretching in the direction perpendicular to the flow direction of the substrate (horizontal axis).
- the draw ratio in this case can be appropriately selected according to the resin as the raw material of the base material, but is preferably 2 to 10 times in each of the vertical axis direction and the horizontal axis direction.
- the base material may be subjected to relaxation treatment or offline heat treatment in terms of dimensional stability.
- the relaxation treatment is performed in a process from the heat setting in the stretching process of the polyester film to the winding in the transversely stretched tenter or after exiting the tenter.
- the relaxation treatment is preferably performed at a treatment temperature of 80 to 200 ° C., more preferably a treatment temperature of 100 to 180 ° C.
- the relaxation rate is preferably in the range of 0.1 to 10% in both the longitudinal direction and the width direction, and more preferably, the relaxation rate is 2 to 6%.
- the relaxed base material is subjected to the following off-line heat treatment to improve heat resistance and to improve dimensional stability.
- the substrate is coated with the undercoat layer coating solution inline on one side or both sides during the film forming process.
- undercoating during the film forming process is referred to as in-line undercoating.
- the resin used for the undercoat layer coating solution is 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 and the like, and any of them can be preferably used.
- a conventionally well-known additive can also be added to these undercoat layers.
- the undercoat layer can be coated by a known method such as roll coating, gravure coating, knife coating, dip coating or spray coating.
- the coating amount of the undercoat layer is preferably about 0.01 to 2 g / m 2 (dry state).
- the optical reflective film is a conductive layer, an antistatic layer, a gas barrier layer, an easy-adhesion layer (adhesion layer) for the purpose of adding further functions under the base material or on the outermost surface layer opposite to the base material.
- One or more functional layers such as an intermediate film layer may be included.
- the optical interference film and the adhesive layer are laminated in this order on the surface of the base material, and the side on which these layers are laminated
- a preferable example is a mode in which a hard coat layer is coated on the substrate surface on the opposite side.
- the order may be an adhesive layer, a base material, an optical interference film, and a hard coat layer, and may further have another functional layer, a base material, or an infrared absorber.
- the optical reflective film of this invention when a preferable example is given also in the specification which sticks the optical reflective film of this invention on the outdoor side of a window glass (outside sticking), it laminates
- the hard coat layer is coated on the surface of the base material on the side opposite to the coated side.
- the order may be an adhesive layer, a base material, an optical interference film, and a hard coat layer, and may further have another functional layer base material or an infrared absorber. .
- the optical reflective film of the present invention includes at least one unit of a high refractive index layer and a low refractive index layer on one side or both sides of a substrate, and preferably the high refractive index layer and the low refractive index layer are alternately arranged. It has a multilayer optical interference film formed by stacking. From the viewpoint of productivity, the range of the total number of high refractive index layers and low refractive index layers per side of the substrate is preferably 100 layers or less, 12 layers or more, more preferably 45 layers or less, 15 layers or more.
- the preferred range of the total number of high refractive index layers and low refractive index layers is applicable even when laminated on only one side of the substrate, and when laminated simultaneously on both sides of the substrate. Is also applicable.
- the total number of high refractive index layers and low refractive index layers on one surface of the substrate and the other surface may be the same or different.
- the lowermost layer (layer contacting the substrate) and the outermost layer may be either a high refractive index layer or a low refractive index layer.
- the optical reflective film preferably has a layer structure in which the lowermost layer and the outermost layer are low refractive index layers.
- the difference in refractive index between the adjacent high refractive index layer and low refractive index layer is preferably 0.1 or more, more preferably 0.25 or more, still more preferably 0.3 or more, and even more. Preferably it is 0.35 or more, and most preferably 0.4 or more.
- the upper limit is not particularly limited, but is usually 1.4 or less.
- This 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 laminate 200 layers or more, which not only lowers productivity but also causes large scattering at the lamination interface. Therefore, transparency may be lowered, and it may be very difficult to manufacture without failure.
- the refractive index difference between the high refractive index layer and the low refractive index layer is within the range of the preferred refractive index difference. Is preferred. However, for example, when the outermost layer is formed as a layer for protecting the film or when the lowermost layer is formed as an adhesion improving layer with the substrate, the above-mentioned preferable refraction is performed with respect to the outermost layer and the lowermost layer. A configuration outside the range of the rate difference may be used.
- n ⁇ d wavelength / 4 when viewed as a single layer film
- the reflected light is controlled to be strengthened by the phase difference.
- reflectivity can be increased.
- n is the refractive index
- d is the physical film thickness of the layer
- the refractive index and film thickness of each layer are controlled to control the reflection of visible light and near infrared light. That is, the reflectance in a specific wavelength region can be increased by the refractive index of each layer, the film thickness of each layer, and the way of stacking each layer.
- the optical reflection film of the present invention can be made into a visible light reflection film or a near infrared reflection film by changing a specific wavelength region for increasing the reflectance. That is, if the specific wavelength region for increasing the reflectance is set to the visible light region, the visible light reflecting film is obtained, and if the specific wavelength region is set to the near infrared region, the near infrared reflecting film is obtained. Moreover, if the specific wavelength area
- the optical reflective film of the present invention may be a (near) infrared reflective (shield) film.
- the transmittance at 550 nm in the visible light region shown in JIS R3106-1998 is 50% or more. Is preferably 70% or more, more preferably 75% or more. Further, the transmittance at 1200 nm is preferably 35% or less, more preferably 25% or less, and further preferably 20% or less. It is preferable to design the optical film thickness and unit so as to be in such a suitable range. In addition, it is preferable that the region having a wavelength of 900 nm to 1400 nm has a region with a reflectance exceeding 50%.
- the transmittance in the visible light region shown in JIS R3106-1998 is preferably 50% or more, more preferably 75% or more, and still more preferably 85% or more. is there.
- the region having a wavelength of 900 nm to 1400 nm has a region with a reflectance exceeding 50%.
- the refractive index of the low refractive index layer is preferably 1.10 to 1.60, more preferably 1.30 to 1.50.
- the refractive index of the high refractive index layer is preferably 1.80 to 2.50, more preferably 1.90 to 2.20.
- each refractive index layer per layer is preferably 20 to 800 nm, and more preferably 50 to 350 nm.
- the high refractive index layer and the low refractive index layer may have a clear interface between them or may be gradually changed.
- the metal oxide concentration profile is etched from the surface in the depth direction using a sputtering method.
- the outermost surface is set to 0 nm, sputtering is performed at a rate of 0.5 nm / min, and the atomic composition ratio can be measured. It is also possible to view the cut surface by cutting the laminated film and measuring the atomic composition ratio with an XPS surface analyzer.
- the concentration of the metal oxide changes discontinuously in the mixed region, the boundary can be found by a tomographic photograph using an electron microscope (TEM).
- 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 total thickness of the optical reflection film is preferably 12 ⁇ m to 315 ⁇ m, more preferably 15 ⁇ m to 200 ⁇ m, and still more preferably 20 ⁇ m to 100 ⁇ m.
- Method for producing optical reflection film There is no particular limitation on the method for producing the optical reflecting film, and any method can be used as long as at least one unit composed of a high refractive index layer and a low refractive index layer can be formed on the substrate. sell.
- a unit composed of a high refractive index layer and a low refractive index layer is laminated on a base material. Specifically, a high refractive index layer and a low refractive index layer are formed. It is preferable to form a laminated body by performing simultaneous multilayer coating and drying. That is, a preferred embodiment of the present invention includes a step of preparing a coating solution for a low refractive index layer containing silica particles adsorbed with silanol-modified polyvinyl alcohol, and a coating for a high refractive index layer containing metal oxide particles.
- An optical reflection film comprising: a step of preparing a solution; and a step of alternately laminating the coating solution for a low refractive index layer and the coating solution for a high refractive index layer on a substrate by simultaneous multilayer coating. is there.
- another preferred embodiment of the present invention includes a step of preparing a coating solution for low refractive index layer containing silica particles adsorbed with silanol-modified polyvinyl alcohol, and a high refractive index layer containing metal oxide particles.
- Infrared reflection including a step of preparing a coating solution, and a step of alternately laminating the coating solution for the low refractive index layer and the coating solution for the high refractive index layer on the base material by simultaneous multilayer coating. It is a film.
- the silica particles having adsorbed silanol-modified polyvinyl alcohol are preferably obtained by mixing and heating the aqueous silica sol and silanol-modified polyvinyl alcohol solution as described above.
- the treatment conditions at this time, the preparation method of the aqueous silica sol and the silanol-modified polyvinyl alcohol solution are as described above.
- the step of preparing the coating solution for the low refractive index layer is a mixture of an aqueous silica sol and a silanol-modified polyvinyl alcohol solution that is heated and adsorbed silanol-modified polyvinyl alcohol.
- silica particles adsorbing silanol-modified polyvinyl alcohol are prepared and then water-soluble polymer is added to suppress the adsorption of water-soluble polymers other than silanol-modified polyvinyl alcohol to the silica particles. It can be present adsorbed on the particles.
- the water-soluble polymer is dissolved in an appropriate solvent and used as a solution.
- the solvent at this time is not particularly limited, but water, an organic solvent, or a mixed solvent thereof is preferable. In consideration of environmental aspects due to the scattering of the organic solvent, water or a mixed solvent of water and a small amount of an organic solvent is more preferable, and water is particularly preferable.
- the content of the water in the organic solvent and the mixed solvent used here is as described in the column of the solvent for preparing the above-mentioned silanol-modified polyvinyl alcohol.
- the solvent for preparing the coating solution for high refractive index is not particularly limited, but water, an organic solvent, or a mixed solvent thereof is preferable. In consideration of environmental aspects due to the scattering of the organic solvent, water or a mixed solvent of water and a small amount of an organic solvent is more preferable, and water is particularly preferable.
- the content of the water in the organic solvent and the mixed solvent used here is as described in the column of the solvent for preparing the above-mentioned silanol-modified polyvinyl alcohol.
- the concentration of the binder resin in each refractive index layer coating solution is preferably 1 to 10% by weight.
- the concentration of the metal oxide particles in each refractive index layer coating solution is preferably 1 to 50% by weight.
- the method for preparing the high refractive index layer coating liquid and the low refractive index layer coating liquid is not particularly limited except for the above-described preferred method for preparing the low refractive index layer coating liquid.
- metal oxide particles, water-soluble polymers, and Examples include a method of adding other additives that are added as necessary and stirring and mixing.
- 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.
- Step of alternately laminating the coating solution for the low refractive index layer and the coating solution for the high refractive index layer on the base material by simultaneous multilayer coating for example, a curtain coating method, a slide bead coating method using a hopper described in U.S. Pat. Nos. 2,761,419 and 2,761,791, an extrusion coating method and the like are preferably used. It is done.
- the temperature of the high refractive index layer coating solution and the low refractive index layer coating solution during simultaneous multilayer coating is preferably a temperature range of 25 to 60 ° C., and a temperature range of 30 to 45 ° C. Is more preferable.
- a temperature range of 25 to 60 ° C. is preferable, and a temperature range of 30 to 45 ° C. is more preferable.
- the viscosity of the high refractive index layer coating solution and the low refractive index layer coating solution during simultaneous multilayer coating is not particularly limited. However, when the slide bead coating method is used, it is preferably in the range of 5 to 100 mPa ⁇ s, more preferably in the range of 10 to 50 mPa ⁇ s, in the preferable temperature range of the coating liquid. When the curtain coating method is used, it is preferably in the range of 5 to 1200 mPa ⁇ s, more preferably in the range of 25 to 500 mPa ⁇ s, in the preferable temperature range of the coating solution. If it is the range of such a viscosity, simultaneous multilayer coating can be performed efficiently.
- the viscosity of the coating solution at 15 ° C. is preferably 100 mPa ⁇ s or more, more preferably 100 to 30,000 mPa ⁇ s, still more preferably 3,000 to 30,000 mPa ⁇ s, and most preferably 10 , 30,000 to 30,000 mPa ⁇ s.
- the conditions for the coating and drying method are not particularly limited.
- the sequential coating method first, 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. One is coated on a substrate and dried to form a layer, and then the other coating liquid is coated on this layer and dried to form a laminated film precursor (unit).
- the number of units necessary for expressing the desired optical reflection performance is sequentially applied and dried by the above method to obtain a laminated film precursor.
- drying is preferably performed in the range of a wet bulb temperature of 5 to 50 ° C.
- a film surface temperature of 5 to 100 ° C. preferably 10 to 50 ° C.
- hot air of 40 to 60 ° C. is blown for 1 to 5 seconds. dry.
- warm air drying, infrared drying, and microwave drying are used.
- drying in a multi-stage process is preferable to drying in a single process, and it is more preferable to set the temperature of the constant rate drying section ⁇ the temperature of the decremental drying section.
- 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.
- the conditions for the coating and drying method when performing simultaneous multilayer coating are as follows. After the simultaneous multilayer coating of the layer coating solution and the low refractive index layer coating solution, the temperature of the formed coating film is preferably cooled (set) preferably to 1 to 15 ° C., and then dried at 10 ° C. or higher. Is preferred. More preferable drying conditions are a wet bulb temperature of 5 to 50 ° C. and a film surface temperature of 10 to 50 ° C. For example, it is dried by blowing warm air at 80 ° C. for 1 to 5 seconds. Moreover, as a cooling method immediately after application
- the set means that the viscosity of the coating composition is increased by means such as lowering the temperature by applying cold air or the like to the coating film, the fluidity of the substances in each layer and in each layer is reduced, or the gel It means the process of converting.
- a state in which the cold air is applied to the coating film from the surface and the finger is pressed against the surface of the coating film is defined as a set completion state.
- the time (setting time) from the time of application until the setting is completed by applying cold air is preferably within 5 minutes, and more preferably within 2 minutes. Further, the lower limit time is not particularly limited, but it is preferable to take 45 seconds or more. If the set time is too short, mixing of the components in the layer may be insufficient. On the other hand, if the set time is too long, the interlayer diffusion of the metal oxide particles proceeds, and the refractive index difference between the high refractive index layer and the low refractive index layer may be insufficient. If the intermediate layer between the high-refractive index layer and the low-refractive index layer is highly elastic, the setting step may not be provided.
- the set time is adjusted by adjusting the concentration of the water-soluble resin and the metal oxide particles, and adding other components such as various known gelling agents such as gelatin, pectin, agar, carrageenan and gellan gum. Can be adjusted.
- the temperature of the cold air is preferably 0 to 25 ° C, more preferably 5 to 10 ° C.
- the time for which the coating film is exposed to 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 optical reflection film can be applied to a wide range of fields.
- film for window pasting such as infrared shielding film, which is pasted to facilities (base) exposed to sunlight for a long time such as outdoor windows of buildings and automobile windows, and vinyl greenhouse for agriculture It is used mainly for the purpose of improving weather resistance as an industrial film.
- the optical reflective film according to the present invention is suitable for a member that is bonded to a substrate such as glass or a glass substitute resin directly or through an adhesive.
- the substrate include, for example, glass, polycarbonate resin, polysulfone resin, acrylic resin, polyolefin resin, polyether resin, polyester resin, polyamide resin, polysulfide resin, unsaturated polyester resin, epoxy resin, melamine resin, and phenol.
- examples thereof include resins, diallyl phthalate resins, polyimide resins, urethane resins, polyvinyl acetate resins, polyvinyl alcohol resins, styrene resins, vinyl chloride resins, metal plates, and ceramics.
- the type of 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, calendar molding, injection molding, hollow molding, compression molding or the like.
- the thickness of the substrate is not particularly limited, but is usually 0.1 mm to 5 cm.
- the adhesive layer or the adhesive layer that bonds the optical reflecting film and the substrate is disposed on the sunlight (heat ray) incident surface side. Further, it is preferable to sandwich the optical reflection film between the window glass and the substrate because it can be sealed from surrounding gas such as moisture and has excellent durability. Even if the optical reflection film is installed outdoors or outside the car (for external application), it is preferable because of environmental durability.
- an adhesive mainly composed of a photocurable or thermosetting resin can be used as the adhesive for bonding the optical reflection film and the substrate.
- 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.
- a polyvinyl butyral resin or an 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).
- Insulation performance and solar heat shielding performance of optical reflective film or optical reflector are generally JIS R3209-1998 (multi-layer glass), JIS R 3106-1998 (transmission, reflectance, emissivity, solar radiation of plate glass) Acquiring rate test method), JIS R3107-1998 (calculation method of thermal resistance of plate glass and heat transmissivity in architecture).
- 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.
- a predetermined value is used for the emissivity of float plate glass, polished plate glass, mold plate glass, and heat ray absorbing plate glass.
- the solar transmittance, solar reflectance, solar absorption rate, and modified emissivity are calculated in accordance with JIS R3106-1998.
- the corrected emissivity is obtained by multiplying the vertical emissivity by the coefficient shown in JIS R3107-1998.
- the heat insulation and solar heat shielding properties are calculated by (1) calculating the thermal resistance of the multi-layer glass according to JIS R3209-1998 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 R3107-1998.
- 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.
- the solar heat shielding property is calculated by obtaining the solar heat acquisition rate according to JIS R3106-1998 and subtracting it from 1.
- silica fine particles A adsorbing silanol-modified polyvinyl alcohol
- a 10 mass% aqueous solution of colloidal silica (particle size (volume average) 4-6 nm, Snowtex OXS, manufactured by Nissan Chemical Industries, Ltd.) was heated to 30 ° C. with stirring, and then silanol-modified polyvinyl alcohol ( 15 parts by mass of a 4.0% by mass aqueous solution of PVA-R1130 (manufactured by Kuraray Co., Ltd.) and 5 parts by mass of pure water were added. Thereafter, the mixture was stirred for 3 hours while maintaining the liquid temperature at 30 ° C., then cooled to 25 ° C., and the resultant was designated as silica fine particle A liquid.
- the particle diameter of the silica fine particles A in this liquid was measured using a Zetasizer Nano-S (Malvern), and the volume average particle diameter was 15 nm.
- silica fine particles B adsorbing silanol-modified polyvinyl alcohol
- the heating temperature 30 ° C. was changed to 40 ° C., and the others were performed in the same manner, and the silica fine particle B liquid was produced.
- the particle diameter of the silica fine particles B in this liquid was measured using a Zetasizer Nano-S (Malvern), and the volume average particle diameter was 50 nm.
- silica fine particles C adsorbing silanol-modified polyvinyl alcohol
- the heating temperature was changed from 30 ° C. to 50 ° C., and the mixture was stirred for 2 hours while maintaining the liquid temperature at 50 ° C., and then cooled to 25 ° C.
- Others were performed in the same manner, and a silica fine particle C solution was prepared.
- the volume average particle size was 80 nm.
- silica fine particles D adsorbing silanol-modified polyvinyl alcohol
- the heating temperature 30 ° C. was changed to 50 ° C., and the others were performed in the same manner to prepare silica fine particle D liquid.
- the particle size of the silica fine particles D in this liquid was measured using a Zetasizer Nano-S (Malvern), and the volume average particle size was 100 nm.
- silica fine particles D were prepared in the same manner as in the preparation of the silica fine particles D except that polyvinyl alcohol (PVA 103, manufactured by Kuraray Co., Ltd.) was used instead of PVA-R1130.
- polyvinyl alcohol PVA 103, manufactured by Kuraray Co., Ltd.
- the particle diameter of the silica fine particles E in this liquid was measured using a Zetasizer Nano-S (Malvern), and the volume average particle diameter was 10 nm.
- a 5% by weight aqueous surfactant solution (SOFTAZOLINE LSB-R, manufactured by Kawaken Fine Chemical Co., Ltd.) 0.64 parts by mass was added to prepare a low refractive index layer coating solution L6.
- the base-treated titanium compound was suspended in pure water so as to have a TiO 2 concentration of 20 g / L, and citric acid was added in an amount of 0.4 mol% with respect to the amount of TiO 2 with stirring, and the temperature was raised.
- citric acid was added in an amount of 0.4 mol% with respect to the amount of TiO 2 with stirring, and the temperature was raised.
- concentrated hydrochloric acid was added to a hydrochloric acid concentration of 30 g / L, and the mixture was stirred for 3 hours while maintaining the liquid temperature.
- the pH and zeta potential of the obtained titanium oxide sol aqueous dispersion were measured, the pH was 1.4 and the zeta potential was +40 mV. Furthermore, when the particle size was measured by Zetasizer Nano manufactured by Malvern, the volume average particle size was 35 nm, and the monodispersity was 16%.
- silica-modified titanium oxide particles 2 kg of pure water was added to 0.5 kg of the 10.0 mass% titanium oxide sol aqueous dispersion described above, and then heated to 90 ° C. Thereafter, 1.3 kg of a 2.0 mass% aqueous silicic acid solution was gradually added, and then the obtained dispersion was subjected to heat treatment at 175 ° C. for 18 hours in an autoclave and further concentrated to obtain a rutile structure. A sol water dispersion of 20% by mass of silica-modified titanium oxide particles having a coating layer of SiO 2 and having a coating layer of SiO 2 was obtained.
- Sol dispersion of silica-modified titanium oxide particles (20.0 mass%) 320 parts Citric acid aqueous solution (1.92 mass%) 120 parts Polyvinyl alcohol (10 mass%) 20 parts (PVA103, polymerization degree 300, saponification degree 99 mol) %, Manufactured by Kuraray) Boric acid aqueous solution (3 mass%) 100 parts Polyvinyl alcohol (4 mass%) 350 parts (Kuraray Co., Ltd., PVA-124, polymerization degree 2400, saponification degree 88 mol%) Surfactant (5% by mass) 1 part (Softazolin LSB-R, manufactured by Kawaken Fine Chemical Co., Ltd.) The coating solution H1 for high refractive index layer was prepared by finishing 1000 parts with pure water.
- coating solution H2 for high refractive index layer The coating solution for high refractive index layer H1 was used except that zirconia sol (Nanouse ZR30-AR, manufactured by Nissan Chemical Industries, Ltd.) was used instead of silica-modified titanium oxide particles.
- zirconia sol Nanouse ZR30-AR, manufactured by Nissan Chemical Industries, Ltd.
- silica-modified titanium oxide particles A high refractive index layer coating solution H2 was prepared in the same manner as the preparation.
- sample 1 Thickness heated to 45 ° C. while maintaining the low refractive index layer coating solution L1 and the high refractive index layer coating solution H1 obtained above at 45 ° C.
- the lowermost layer and the uppermost layer are low refractive index layers.
- a total of nine layers were simultaneously applied so that the high refractive index layer was 150 nm and each layer was 130 nm.
- 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).
- Samples 2 to 9 were prepared in the same manner as Sample 1 except that the coating solution for the low refractive index layer and the coating solution for the high refractive index layer were changed to those shown in Table 1, respectively.
- the haze value was measured as follows by measuring samples 1 to 9 with a haze meter (NDH2000, manufactured by Nippon Denshoku Industries Co., Ltd.).
- Samples 1 to 7 have good film characteristics because of low infrared transmittance and low haze value. Samples 1 to 7 had few coating streaks and point-like failures and good coating properties.
Abstract
Description
[シラノール変性ポリビニルアルコールを吸着したシリカ粒子(以下、吸着シリカ粒子とも称する)]
吸着シリカ粒子を構成するシリカ粒子は、平均粒径が、3~50nmであることが好ましく、3~40nmであるのがさらに好ましく、3~20nmであるのが特に好ましく、4~10nmであるのがもっとも好ましい。かような範囲のシリカ粒子を用いることによって、ヘイズが少なく可視光透過性に優れる光学反射フィルムが得られる点で好ましい。シリカ粒子の平均粒径は、シラノール変性ポリビニルアルコールが吸着していないシリカ粒子を動的光散乱法(測定装置:ゼータサイザーNano-S(マルバーン社))により測定した体積平均粒径である。下記水性シリカゾル中のシリカ粒子は該ゾル中の分散状態で体積平均粒径を測定することができる。なお、動的光散乱法による測定方法では、一次、二次粒子の区別なく測定されるため、ここでいう平均粒径は、一次、二次、および凝集体等の粒子の平均粒径となる。
高屈折率層としては、上記低屈折率層よりも屈折率が高い層であれば特に限定されないが、屈折率の制御が容易であることから、高屈折率層が金属酸化物粒子を含むことが好ましい。ここで、高屈折率層に含まれる金属酸化物粒子は、屈折率差を生じさせるために低屈折率層とは異なる金属酸化物粒子であることが好ましい。
本明細書中、バインダー樹脂とは、金属酸化物粒子等の被分散物の分散媒体であって、重量平均分子量が1,000~200,000(好ましくは3,000~60,000)の高分子化合物を意味する。ここで重量平均分子量は、公知の方法によって測定することができ、例えば、静的光散乱法、ゲルパーミエーションクロマトグラフ法(GPC)、TOFMASSなどによって測定することができる。バインダー樹脂を含有することでウェット塗布が可能となり、生産性を向上させることができる。
反応性官能基を有するポリマーとしては、例えば、ポリビニルアルコール類、ポリビニルピロリドン類、ポリアクリル酸、アクリル酸-アクリルニトリル共重合体、アクリル酸カリウム-アクリルニトリル共重合体、酢酸ビニル-アクリル酸エステル共重合体、もしくはアクリル酸-アクリル酸エステル共重合体などのアクリル樹脂、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、もしくはスチレン-α-メチルスチレン-アクリル酸-アクリル酸エステル共重合体などのスチレンアクリル酸樹脂、スチレン-スチレンスルホン酸ナトリウム共重合体、スチレン-2-ヒドロキシエチルアクリレート共重合体、スチレン-2-ヒドロキシエチルアクリレート-スチレンスルホン酸カリウム共重合体、スチレン-マレイン酸共重合体、スチレン-無水マレイン酸共重合体、ビニルナフタレン-アクリル酸共重合体、ビニルナフタレン-マレイン酸共重合体、酢酸ビニル-マレイン酸エステル共重合体、酢酸ビニル-クロトン酸共重合体、酢酸ビニル-アクリル酸共重合体などの酢酸ビニル系共重合体及びそれらの塩が挙げられる。
ゼラチンとしては、従来、ハロゲン化銀写真感光材料分野で広く用いられてきた各種ゼラチンを適用することができ、例えば、酸処理ゼラチン、アルカリ処理ゼラチンの他に、ゼラチンの製造過程で酵素処理をする酵素処理ゼラチンおよびゼラチン誘導体、すなわち分子中に官能基としてのアミノ基、イミノ基、ヒドロキシル基、カルボキシル基を有し、それと反応して得る基を持った試薬で処理し改質したものでもよい。ゼラチンの一般的製造法に関してはよく知られており、例えば、T.H.James:The Theory of Photographic Process 4th. ed. 1977(Macmillan)55項、科学写真便覧(上)72~75項(丸善)、写真工学の基礎-銀塩写真編119~124頁(コロナ社)等の記載を参考にすることができる。また、リサーチ・ディスクロージャー誌第176巻、No.17643(1978年12月)のIX項に記載されているゼラチンを挙げることができる。
ゼラチンを用いる場合、必要に応じてゼラチンの硬膜剤を添加することもできる。
セルロース類としては、水溶性のセルロース誘導体が好ましく用いることができ、例えば、カルボキシメチルセルロース(セルロースカルボキシメチルエーテル)、メチルセルロース、ヒドロキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロース等の水溶性セルロース誘導体や、カルボン酸基含有セルロース類であるカルボキシメチルセルロース(セルロースカルボキシメチルエーテル)、カルボキシエチルセルロース等を挙げることができる。その他には、ニトロセルロース、セルロースアセテートプロピオネート、酢酸セルロース、セルロース硫酸エステル等のセルロース誘導体を挙げることができる。
増粘多糖類としては、特に制限はなく、例えば、一般に知られている天然単純多糖類、天然複合多糖類、合成単純多糖類及び合成複合多糖類に挙げることができ、これら多糖類の詳細については、「生化学事典(第2版),東京化学同人出版」、「食品工業」第31巻(1988)21頁等を参照することができる。
水溶性高分子を硬化させるため、硬化剤を使用することもできる。硬化剤としては、当該水溶性高分子と硬化反応を起こすものであれば特に制限はない。例えば、ポリビニルアルコールを用いる場合では、硬化剤として、ホウ酸及びその塩が好ましい。ホウ酸及びその塩以外にも公知のものが使用でき、一般的には、ポリビニルアルコールと反応し得る基を有する化合物あるいはポリビニルアルコールが有する異なる基同士の反応を促進するような化合物であり、適宜選択して用いられる。硬化剤の具体例としては、例えば、エポキシ系硬化剤(ジグリシジルエチルエーテル、エチレングリコールジグリシジルエーテル、1,4-ブタンジオールジグリシジルエーテル、1,6-ジグリシジルシクロヘキサン、N,N-ジグリシジル-4-グリシジルオキシアニリン、ソルビトールポリグリシジルエーテル、グリセロールポリグリシジルエーテル等)、アルデヒド系硬化剤(ホルムアルデヒド、グリオキザール等)、活性ハロゲン系硬化剤(2,4-ジクロロ-4-ヒドロキシ-1,3,5,-s-トリアジン等)、活性ビニル系化合物(1,3,5-トリスアクリロイル-ヘキサヒドロ-s-トリアジン、ビスビニルスルホニルメチルエーテル等)、アルミニウム明礬、ホウ砂等が挙げられる。
各屈折率層には、塗布性の観点から界面活性剤を含有することが好ましい。
各屈折率層には、必要に応じて各種の添加剤を用いることができる。各屈折率層における添加剤の含有量は、屈折率層の固形分100重量%に対して、0~20重量%であることが好ましい。当該添加剤の例を以下に記載する。
等電点が6.5以下のアミノ酸を含むことにより、高屈折率層または低屈折率層中の金属酸化物粒子の分散性が向上しうる。
各屈折率層は、エマルジョン樹脂をさらに含有していてもよい。エマルジョン樹脂を含むことにより、膜の柔軟性が高くなりガラスへの貼りつけ等の加工性がよくなる。
その他にも、各屈折率層には、例えば、特開昭57-74193号公報、同57-87988号公報及び同62-261476号公報に記載の紫外線吸収剤、特開昭57-74192号公報、同57-87989号公報、同60-72785号公報、同61-146591号公報、特開平1-95091号公報および同3-13376号公報等に記載されている退色防止剤、特開昭59-42993号公報、同59-52689号公報、同62-280069号公報、同61-242871号公報および特開平4-219266号公報等に記載されている蛍光増白剤、硫酸、リン酸、酢酸、クエン酸、水酸化ナトリウム、水酸化カリウム、炭酸カリウム等のpH調整剤、消泡剤、ジエチレングリコール等の潤滑剤、防腐剤、帯電防止剤、マット剤等の公知の各種添加剤を含有していてもよい。
光学反射フィルムの支持体である基材の厚みは、5~200μmであることが好ましく、より好ましくは15~150μmである。また、本発明に係る基材は、2枚を重ねたものであっても良く、この場合、その種類が同じでも異なってもよい。
光学反射フィルムは、基材の下または基材と反対側の最表面層の上に、さらなる機能の付加を目的として、導電性層、帯電防止層、ガスバリア層、易接着層(接着層)、防汚層、消臭層、流滴層、易滑層、ハードコート層、耐摩耗性層、反射防止層、電磁波シールド層、紫外線吸収層、赤外線吸収層、印刷層、蛍光発光層、ホログラム層、剥離層、粘着層、接着層、本発明の高屈折率層および低屈折率層以外の赤外線カット層(金属層、液晶層)、着色層(可視光線吸収層)、合わせガラスに利用される中間膜層などの機能層の1つ以上を有していてもよい。
本発明の光学反射フィルムは、基材の片面上または両面上に、高屈折率層および低屈折率層のユニットを少なくとも1つ含み、好適には高屈折率層と低屈折率層が交互に積層して形成された多層の光学干渉膜を有する。生産性の観点から、基材の片面あたりの好ましい高屈折率層および低屈折率層の総層数の範囲は、100層以下12層以上、より好ましくは45層以下15層以上である。なお、前記の好ましい高屈折率層および低屈折率層の総層数の範囲は、基材の片面にのみ積層される場合においても適応可能であり、基材の両面に同時に積層される場合においても適応可能である。基材の両面に積層される場合において、基材一の面と他の面との高屈折率層および低屈折率層の総層数は、同じであってもよく、異なっていてもよい。また、光学反射フィルムにおいて、最下層(基材と接触する層)および最表層は、高屈折率層および低屈折率層のいずれであってもよい。しかしながら、低屈折率層が最下層および最表層に位置する層構成とすることにより、最下層の基材への密着性、最上層の吹かれ耐性、さらには最表層へのハードコート層等の塗布性や密着性に優れるという観点から、光学反射フィルムとしては、最下層および最表層が低屈折率層である層構成が好ましい。
光学反射フィルムの製造方法について特に制限はなく、基材上に、高屈折率層と低屈折率層とから構成されるユニットを少なくとも1つ形成することができるのであれば、いかなる方法でも用いられうる。
シラノール変性ポリビニルアルコールを吸着したシリカ粒子は、好適には、上述したように水性シリカゾルとシラノール変性ポリビニルアルコール溶液とを混合して加温処理して得られる。この際の処理条件、水性シリカゾルおよびシラノール変性ポリビニルアルコール溶液の作製方法は上述したとおりである。
高屈折率用塗布液を調製するための溶媒としては、特に制限されないが、水、有機溶媒、またはその混合溶媒が好ましい。また、有機溶媒の飛散による環境面を考慮すると、水、または水と少量の有機溶媒との混合溶媒がより好ましく、水が特に好ましい。ここで用いられる有機溶媒および混合溶媒中の水の含有量等は、上述のシラノール変性ポリビニルアルコールを調製するための溶媒の欄で記載したとおりである。
塗布方式としては、例えば、カーテン塗布方法、米国特許第2,761,419号、同第2,761,791号公報に記載のホッパーを使用するスライドビード塗布方法、エクストルージョンコート法等が好ましく用いられる。
塗布および乾燥方法の条件は、特に制限されないが、例えば、逐次塗布法の場合は、まず、30~60℃に加温した高屈折率層用塗布液および低屈折率層用塗布液のいずれか一方を基材上に塗布、乾燥して層を形成した後、もう一方の塗布液をこの層上に塗布、乾燥して積層膜前駆体(ユニット)を形成する。次に、所望の光学反射性能を発現するために必要なユニット数を、前記方法にて逐次塗布、乾燥して積層させて積層膜前駆体を得る。乾燥する際は、形成した塗膜を、30℃以上で乾燥することが好ましい。例えば、湿球温度5~50℃、膜面温度5~100℃(好ましくは10~50℃)の範囲で乾燥するのが好ましく、例えば、40~60℃の温風を1~5秒吹き付けて乾燥する。乾燥方法としては、温風乾燥、赤外乾燥、マイクロ波乾燥が用いられる。また単一プロセスでの乾燥よりも多段プロセスの乾燥が好ましく、恒率乾燥部の温度<減率乾燥部の温度にするのがより好ましい。この場合の恒率乾燥部の温度範囲は30~60℃、減率乾燥部の温度範囲は50~100℃にするのが好ましい。
上記光学反射フィルムは、幅広い分野に応用することができる。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(基体)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。特に、本発明に係る光学反射フィルムが直接または接着剤を介してガラスまたはガラス代替の樹脂などの基体に貼合されている部材に好適である。
コロイダルシリカの10質量%水溶液(粒径(体積平均)4~6nm、スノーテックスOXS 日産化学工業(株)社製)80質量部を撹拌しながら30℃に加温した後、シラノール変性ポリビニルアルコール(PVA-R1130、クラレ社製)の4.0質量%水溶液15質量部と、純水5質量部を添加した。その後、液温を30℃に維持しながら3時間撹拌した後25℃に冷却し、得られたものをシリカ微粒子A液とした。
上記シリカ微粒子Aの作製において、加温温度30℃を40℃に変更し、その他は同様の方法で行い、シリカ微粒子B液を作製した。
上記シリカ微粒子Aの作製において、加温温度30℃を50℃に変更し、液温50℃に維持しながら2時間撹拌した後に25℃に冷却した。その他は同様の方法で行い、シリカ微粒子C液を作製した。
上記シリカ微粒子Aの作製において、加温温度30℃を50℃に変更し、その他は同様の方法で行い、シリカ微粒子D液を作製した。
上記シリカ微粒子Dの作製において、PVA-R1130に替えてポリビニルアルコール(PVA103、クラレ社製)を用いた以外は同様の方法で行い、シリカ微粒子E液を作製した。
40℃に加温した68質量部のシリカ微粒子A液に、3質量%ホウ酸水溶液20質量部を撹拌しながら加えた後、ポリビニルアルコール(PVA235、重量平均分子量15万、クラレ社製)の5質量%水溶液280質量部と純水240質量部とを添加して10分間攪拌した後、5質量%界面活性剤水溶液(ソフタゾリンLSB-R、川研ファインケミカル社製)0.64質量部を添加して低屈折率層塗布液L1を調製した。
40℃に加温した68質量部のシリカ微粒子B液に、3%ホウ酸水溶液20質量部を撹拌しながら加えた後、ポリビニルアルコール(PVA235、重量平均分子量15万、クラレ社製)の5質量%水溶液280質量部と純水240質量部とを添加して10分間攪拌した後、5質量%界面活性剤水溶液(ソフタゾリンLSB-R、川研ファインケミカル社製)0.64質量部を添加して低屈折率層塗布液L2を調製した。
40℃に加温した68質量部のシリカ微粒子C液に、3%ホウ酸水溶液20質量部を撹拌しながら加えた後、ポリビニルアルコール(PVA235、重量平均分子量15万、クラレ社製)の5質量%水溶液280質量部と純水240質量部とを添加して10分間攪拌した後、5質量%界面活性剤水溶液(ソフタゾリンLSB-R、川研ファインケミカル社製)0.64質量部を添加して低屈折率層塗布液L3を調製した。
40℃に加温した68質量部のシリカ微粒子D液に、3%ホウ酸水溶液20質量部を撹拌しながら加えた後、ポリビニルアルコール(PVA235、重量平均分子量15万、クラレ社製)の5質量%水溶液280質量部と純水240質量部とを添加して10分間攪拌した後、5質量%界面活性剤水溶液(ソフタゾリンLSB-R、川研ファインケミカル社製)0.64質量部を添加して低屈折率層塗布液L4を調製した。
40℃に加温した68質量部のシリカ微粒子E液に、3%ホウ酸水溶液20質量部を撹拌しながら加えた後、ポリビニルアルコール(PVA235、重量平均分子量15万、クラレ社製)の5質量%水溶液280質量部と純水240質量部とを添加して10分間攪拌した後、5質量%界面活性剤水溶液(ソフタゾリンLSB-R、川研ファインケミカル社製)0.64質量部を添加して低屈折率層塗布液L5を調製した。
40℃に加温した60質量部のコロイダルシリカ(スノーテックスOXS、日産化学工業社製)に、3%ホウ酸水溶液20質量部を撹拌しながら加えた後、ポリビニルアルコール(PVA235、重量平均分子量15万、クラレ社製)の5質量%水溶液280質量部と純水240質量部とを添加して10分間攪拌した後、5質量%界面活性剤水溶液(ソフタゾリンLSB-R、川研ファインケミカル社製)0.64質量部を添加して低屈折率層塗布液L6を調製した。
二酸化チタン水和物を水に懸濁させた水性懸濁液(TiO2濃度100g/L)10L(リットル)に、水酸化ナトリウム水溶液(濃度10モル/L)30Lを撹拌下で添加し、90℃に昇温し、5時間熟成した後、塩酸で中和、濾過、水洗した。なお、上記反応(処理)において、二酸化チタン水和物は公知の手法に従い、硫酸チタン水溶液を熱加水分解して得られたものを用いた。
SiO2濃度が2.0質量%のケイ酸水溶液を調製した。
上記の10.0質量%酸化チタンゾル水系分散液0.5kgに、純水2kgを加えた後、90℃に加熱した。その後、2.0質量%のケイ酸水溶液1.3kgを徐々に添加し、次いで、得られた分散液をオートクレーブ中、175℃で18時間加熱処理を行い、さらに濃縮して、ルチル型構造を有する酸化チタンで、被覆層がSiO2である、20質量%のシリカ変性酸化チタン粒子のゾル水分散液を得た。
クエン酸水溶液(1.92質量%) 120部
ポリビニルアルコール(10質量%) 20部(PVA103、重合度300、鹸化度99mol%、クラレ社製)
ほう酸水溶液(3質量%) 100部
ポリビニルアルコール(4質量%) 350部(クラレ社製、PVA-124、重合度2400、鹸化度88mol%)
界面活性剤(5質量%) 1部(ソフタゾリンLSB-R、川研ファインケミカル社製)
純水で1000部に仕上げ、高屈折率層用塗布液H1を調製した。
ポリビニルアルコール水溶液(クラレ社製、PVA-124、重合度2400、鹸化度88mol%)の代わりに、メチルセルロース(メトローズSM25、信越化学工業(株)社製)の4質量%水溶液を使用したほかは高屈折率層用塗布液H1と同様にして高屈折率層用塗布液H3を調製した。
9層重層塗布可能なスライドホッパー塗布装置を用い、上記で得られた低屈折率層用塗布液L1および高屈折率層用塗布液H1を45℃に保温しながら、45℃に加温した厚さ50μmのポリエチレンテレフタレートフィルム(東洋紡製A4300:両面易接着層)上に、最下層と最上層は低屈折率層とし、それ以外はそれぞれ交互に、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になるように計9層の同時重層塗布を行った。
低屈折率層用塗布液および高屈折率層用塗布液を表1に記載のものにそれぞれ変更した以外は、試料1の作製と同様にして試料2~9を作製した。
<可視光透過率及び近赤外透過率の測定>
上記分光光度計(積分球使用、日立製作所社製、U-4000型)を用い、各近赤外反射フィルムの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、近赤外透過率は1200nmにおける透過率の値を用いた。
ヘイズ値は、試料1~9をヘイズメーター(日本電色工業社製、NDH2000)により測定し、下記のように評価した。
1%超~1.5%以下 ○
1.5%超~2%以下 △
2%超 ×
<塗布筋>
作製した試料1~9について、塗布巾1.8mの塗布長1mの部分で目視により塗布試料表面の塗布筋故障を下記の様に評価した。
作製した試料1~9について、塗布巾1.8mの塗布長1mの部分で目視により塗布試料表面の点状故障を下記の様に評価した。
Claims (9)
- 基材上に、高屈折率層と低屈折率層とを積層したユニットを少なくとも1つ含む光学反射フィルムにおいて、
前記低屈折率層が、シラノール変性ポリビニルアルコールを吸着したシリカ粒子を含有することを特徴とする光学反射フィルム。 - 前記シラノール変性ポリビニルアルコールを吸着したシリカ粒子が、水性シリカゾルとシラノール変性ポリビニルアルコール溶液とを混合して加温処理することにより形成されてなる、請求項1記載の光学反射フィルム。
- 前記シラノール変性ポリビニルアルコールを吸着したシリカ粒子の平均粒径が、20nm以上80nm以下である、請求項1または2記載の光学反射フィルム。
- 前記低屈折率層が水溶性高分子を含む、請求項1~3のいずれか1項に記載の光学反射フィルム。
- 前記高屈折率層が金属酸化物粒子を含む、請求項1~4のいずれか1項に記載の光学反射フィルム。
- 前記金属酸化物粒子が酸化チタンおよび酸化ジルコニウムの少なくとも一方を含む、請求項5に記載の光学反射フィルム。
- 赤外遮蔽フィルムである、請求項1~6のいずれか1項に記載の光学反射フィルム。
- シラノール変性ポリビニルアルコールを吸着したシリカ粒子を含有する低屈折率層用塗布液を作製する工程と、
金属酸化物粒子を含有する高屈折率層用塗布液を作製する工程と、
基材上に、前記低屈折率層用塗布液と、前記高屈折率層用塗布液とを、同時重層塗布により交互に積層させる工程と、
を含むことを特徴とする、光学反射フィルムの製造方法。 - 前記低屈折率層用塗布液を作製する工程が、
水性シリカゾルとシラノール変性ポリビニルアルコール溶液とを混合して加温処理してシラノール変性ポリビニルアルコールを吸着したシリカ粒子を得る工程(A)と、
前記工程(A)の後に水溶性高分子を添加する工程(B)と、
を含む、請求項8に記載の光学反射フィルムの製造方法。
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