WO2016158604A1 - 近赤外線遮蔽フィルム、その製造方法及び粘着剤組成物 - Google Patents
近赤外線遮蔽フィルム、その製造方法及び粘着剤組成物 Download PDFInfo
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- WO2016158604A1 WO2016158604A1 PCT/JP2016/059137 JP2016059137W WO2016158604A1 WO 2016158604 A1 WO2016158604 A1 WO 2016158604A1 JP 2016059137 W JP2016059137 W JP 2016059137W WO 2016158604 A1 WO2016158604 A1 WO 2016158604A1
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Definitions
- the present invention relates to a near-infrared shielding film, a method for producing the same, and an adhesive composition. Specifically, the present invention relates to a near-infrared shielding film having a low initial haze and a suppressed haze increase in a weather resistance test, a method for producing the same, and a pressure-sensitive adhesive composition.
- Display device parts such as image display devices (for example, liquid crystal display devices, CRT display devices, plasma display devices, EL (electroluminescence) display devices, etc.) and touch panels, and protective films such as windows for buildings, automobiles, trains,
- image display devices for example, liquid crystal display devices, CRT display devices, plasma display devices, EL (electroluminescence) display devices, etc.
- protective films such as windows for buildings, automobiles, trains
- active energy ray-curable resin composition having the ability to absorb infrared rays (heat ray) (heat shield property) on at least one surface side of a substrate as a heat shield film
- Patent Document 1 uses an adhesive adhesive having a composite tungsten oxide fine particle and a carboxy group as a main crosslinking group and having an acid value of 0.6 to 30 mgKOH / g. It has been disclosed to suppress chromaticity fluctuations due to changes in spectral characteristics under high-temperature and high-humidity environments of 60 ° C. and 90% RH, but the compatibility between resin and fine particles is insufficient. The haze value was high, and suppression of haze increase under a high temperature environment or a high temperature and high humidity environment was insufficient.
- Patent Document 2 includes an acrylic adhesive resin having an acrylate skeleton and having a hydroxy group as a main crosslinking group and cesium-containing composite tungsten oxide (CWO) which is a composite tungsten oxide fine particle.
- CWO cesium-containing composite tungsten oxide
- the dispersion contains a typical metal compound selected from zinc carbonate, zinc oxide, and magnesium oxide, it suppresses haze, but there is a description about durability such as suppression of haze increase in a high temperature and high humidity environment. Absent.
- the present invention has been made in view of the above-mentioned problems and circumstances, and the problem to be solved is a near-infrared shielding film having a low initial haze and a suppressed increase in haze in a weather resistance test, a method for producing the same, and a pressure-sensitive adhesive It is to provide a composition.
- the present inventor is a near-infrared shielding film in the process of examining the cause of the above-mentioned problems, and has a specific range of hydroxy value and acid on at least one surface of the transparent substrate.
- a specific layer containing a plurality of resins having a valence and tungsten oxide fine particles or composite tungsten oxide fine particles functioning as an infrared absorber the initial haze is low and the haze is increased in a weather resistance test. It has been found that a near-infrared shielding film in which is suppressed, a method for producing the same, and a pressure-sensitive adhesive composition to be used are obtained.
- a near-infrared shielding film comprising a constituent layer containing the following resin A, at least one of the following resin B or resin C, and the following oxide fine particles D on at least one surface of a transparent substrate.
- Resin A Resin having an acid value of less than 0.5 mg KOH / g and a hydroxy value in the range of 5 to 60 mg KOH / g
- Resin B Resin having an acid value in the range of 1 to 60 mg KOH / g
- Resin C 1.
- Resin oxide fine particles D tungsten oxide fine particles or composite tungsten oxide fine particles having an acid value of 1 mg KOH / g or more and a hydroxy value in the range of 5 to 60 mg KOH / g
- the near-infrared reflective layer that reflects 20% or more of light having a wavelength in the range of 800 to 1300 nm is provided on at least one surface of the transparent substrate provided with the constituent layer.
- Item 3. A near-infrared shielding film described in item 2.
- a pressure-sensitive adhesive composition comprising the following resin A, at least one of the following resin B or resin C, and the following oxide fine particles D.
- Resin A Resin having an acid value of less than 0.5 mg KOH / g and a hydroxy value in the range of 5 to 60 mg KOH / g
- Resin B Resin having an acid value in the range of 1 to 60 mg KOH / g
- Resin C Resin having an acid value of 1 mg KOH / g or more and a hydroxy value in the range of 5 to 60 mg KOH / g
- Oxide fine particles D Tungsten oxide fine particles or composite tungsten oxide fine particles
- a near-infrared shielding film having a low initial haze and a suppressed haze increase in a weather resistance test, a method for producing the same, and a pressure-sensitive adhesive composition can be provided.
- the present invention has a specific range of hydroxy value and acid value, and is a combined use of an acrylic resin having a hydroxy group as a main crosslinking group and an acrylic resin having a carboxy group as a main crosslinking group, or a hydroxy group as a main crosslinking
- an acrylic resin based on an acrylic resin having both a carboxy group and a hydroxy group as a main cross-linking group as a binder of tungsten oxide fine particles or composite tungsten oxide fine particles that are infrared absorbers, It has been found that the initial haze derived from the infrared absorber is effectively suppressed and haze increase in a high temperature and high humidity environment is suppressed.
- an acrylic resin having a hydroxy group as a main cross-linking group aggregates in a high-temperature and high-humidity environment.
- an acrylic resin having a carboxy group as a main cross-linking group has insufficient compatibility with tungsten oxide fine particles or composite tungsten oxide fine particles and has a high initial haze.
- a resin having a hydroxy group and a carboxy group as main cross-linking groups in one molecule has a small effect on the effect, and it is not sufficient to solve the above problems.
- the present invention has a specific range of hydroxy value and acid value, and selectively uses an acrylic resin having a hydroxy group as a main cross-linking group and an acrylic resin having a carboxy group as a main cross-linking group. It is characterized by being a binder for tungsten oxide fine particles or composite tungsten oxide fine particles.
- the negative surface is reduced, and the positive surface is used to reduce the initial haze and the high temperature. It is presumed that haze increase in a wet environment and a weather resistance test can be suppressed.
- Sectional drawing which shows the structure of the near-infrared shielding film of this invention
- the schematic sectional drawing which shows the structure provided with the reflective layer unit which has a near-infrared reflective layer group of the near-infrared shielding film of this invention.
- the near-infrared shielding film of the present invention has a constituent layer containing the resin A, at least one of the resin B or the resin C, and the oxide fine particles D on at least one surface of a transparent substrate. It is characterized by. This feature is a technical feature common to the inventions according to claims 1 to 5.
- a film that effectively shields near infrared rays with a thin film having a low haze that the constituent layer is an adhesive layer constituting a near infrared shielding film is preferable.
- a near infrared reflection layer that reflects 20% or more of light having a wavelength of 800 to 1300 nm on at least one surface of the transparent substrate provided with the constituent layers. It is preferable as a film.
- the above (d) tungsten oxide fine particles or composite tungsten oxide fine particles are obtained by using (a) an acid value of less than 0.5 mgKOH / g and a hydroxy value of 5 to After being dispersed and mixed in a resin in the range of 60 mg KOH / g, (b) a resin having an acid value in the range of 1 to 60 mg KOH / g or (c) an acid value of 1 mg KOH / g or more and hydroxy Adding at least one of resins having a value within the range of 5 to 60 mgKOH / g is a preferable production method from the viewpoint of reducing the initial haze.
- the pressure-sensitive adhesive composition containing the resin A, at least one of the resin B or the resin C, and the oxide fine particles D as a compound is high by using the pressure-sensitive adhesive composition as a pressure-sensitive adhesive layer. It is preferable for providing a near-infrared shielding film having a near-infrared shielding effect, a low initial haze, and a haze increase suppressed in a weather resistance test.
- ⁇ is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.
- the near-infrared shielding film of the present invention comprises a constituent layer containing, as a compound, at least one of the following resin A, at least one of the following resin B or resin C, and the following oxide fine particles D on at least one surface of a transparent substrate. It is characterized by having.
- Resin A Resin having an acid value of less than 0.5 mg KOH / g and a hydroxy value in the range of 5 to 60 mg KOH / g
- Resin B Resin having an acid value in the range of 1 to 60 mg KOH / g
- Resin C Resin oxide fine particle D: Tungsten oxide fine particle or composite tungsten oxide fine particle having an acid value of 1 mg KOH / g or more and a hydroxy value in the range of 5 to 60 mg KOH / g
- the acid value of the resin is This represents the amount of all acidic components (for example, carboxy group, sulfo group, etc.) contained in 1 g of a resin containing carboxy groups, and is expressed in mg of potassium hydroxide required to neutralize all acidic components.
- the acid value can be measured by titration, for example, a method defined in JIS K1557-1: 2007 or the like.
- the acid value of the resin corresponds to the number of carboxy groups contained in 1 g of the resin.
- the hydroxy value of a resin (also referred to as a hydroxyl value) is the number of mg of potassium hydroxide required to neutralize acetic acid bonded to a hydroxy group when 1 g of a resin containing a hydroxy group is acetylated. expressed.
- a method for measuring the hydroxyl group a method defined by titration, for example, JIS K1557-1: 2007 can be used.
- the near-infrared shielding property in the present invention means that the near-infrared transmittance in the near-infrared region, that is, the wavelength region of 800 to 1100 nm is 20% or less, more preferably 15% or less.
- haze is formed so that the near-infrared shielding film of the present invention is formed with a film thickness of 25 ⁇ m and the haze value (initial haze value) is 1.0% or less when the haze value according to JIS K7136 is measured. It is preferable to adjust.
- the haze value is more preferably 0.8% or less, particularly preferably 0.6% or less.
- FIG. 1 is a cross-sectional view showing the configuration of the near-infrared shielding film of the present invention.
- the near-infrared shielding film 10 of the present invention is composed of an adhesive layer 12 that functions as a near-infrared shielding layer on one side of a transparent substrate 11, a release layer 13 (separator film), and a hard coat layer 14 on the opposite side. It is preferable. Other functional layers may be appropriately formed between the layers.
- the transparent substrate applicable to the near-infrared shielding film of the present invention is a transparent resin film.
- transparent as used in the present invention means that the visible light transmittance measured by a method according to JIS S3107 (2013) is 50% or more, preferably 60% or more, more preferably 70%. Above, especially preferably 80% or more.
- the thickness of the transparent substrate used in the present invention is preferably in the range of 20 to 200 ⁇ m, more preferably in the range of 25 to 100 ⁇ m, and still more preferably in the range of 30 to 70 ⁇ m. If the thickness of the transparent resin film is 20 ⁇ m or more, wrinkles or the like are less likely to occur during handling, and if the thickness is 200 ⁇ m or less, when the laminated glass is produced, to the curved glass surface when the glass substrate is laminated. The follow-up performance is improved.
- the transparent substrate used in the present invention is preferably a biaxially oriented polyester film, but an unstretched or at least one stretched polyester film can also be used.
- a stretched film is preferable from the viewpoint of strength improvement and thermal expansion suppression.
- a stretched film is more preferable when a laminated glass provided with a near-infrared reflective window film using the near-infrared shielding film of the present invention is used as an automobile windshield.
- the transparent substrate according to the present invention has a thermal shrinkage within a range of 0.1 to 10.0% at a temperature of 150 ° C. from the viewpoint of preventing generation of wrinkles in the near infrared shielding film and cracking of the near infrared reflection layer. It is preferable that it is in the range of 1.5 to 5.0%.
- the transparent substrate applicable to the near-infrared shielding film of the present invention is not particularly limited as long as it is transparent, but various resin films are preferably used.
- polyolefin films for example, polyethylene, polypropylene) Etc.
- polyester film eg, polyethylene terephthalate, polyethylene naphthalate, etc.
- polyvinyl chloride e.g, triacetyl cellulose film, etc., preferably polyester film, triacetyl cellulose film, particularly preferably polyester film. is there.
- a transparent resin film that is a transparent substrate can be produced by a conventionally known general method.
- an unstretched transparent resin film that is substantially amorphous and not oriented can be produced by melting a resin as a material with an extruder, extruding it with an annular die or a T-die, and rapidly cooling it.
- the unstretched transparent resin film is uniaxially stretched, tenter-type sequential biaxial stretching, tenter-type simultaneous biaxial stretching, tubular simultaneous biaxial stretching, and other known methods such as transparent resin film flow (vertical axis) direction.
- a stretched transparent resin film can be produced by stretching in the direction perpendicular to the flow direction of the transparent resin film (horizontal axis).
- the draw ratio in this case can be appropriately selected according to the resin that is the raw material of the transparent resin film, but is preferably 2 to 10 times in the vertical axis direction and the horizontal axis direction.
- the transparent resin film may be subjected to relaxation treatment or offline heat treatment in terms of dimensional stability.
- the relaxation treatment is performed in a process from the heat setting in the stretching process of the polyester film to the winding in the transversely stretched tenter or after exiting the tenter.
- the relaxation treatment is preferably performed at a treatment temperature of 80 to 200 ° C., more preferably a treatment temperature of 100 to 180 ° C.
- the relaxation rate is preferably in the range of 0.1 to 10% in both the longitudinal direction and the width direction.
- the relaxed base material is improved in heat resistance by performing off-line heat treatment.
- the transparent resin film is preferably coated with the undercoat layer coating solution in-line on one or both sides during the film forming process.
- undercoating during the film forming process is referred to as in-line undercoating.
- resins used in the undercoat layer coating solution useful in the present invention include polyester resins, acrylic-modified polyester resins, polyurethane resins, acrylic resins, vinyl resins, vinylidene chloride resins, polyethyleneimine vinylidene resins, polyethyleneimine resins, and polyvinyl alcohol resins. , Modified polyvinyl alcohol resin, gelatin and the like, and any of them can be preferably used.
- a conventionally well-known additive can also be added to these undercoat layers.
- the undercoat layer can be coated by a known method such as roll coating, gravure coating, knife coating, dip coating or spray coating.
- the coating amount of the undercoat layer is preferably about 0.01 to 2 g / m 2 (dry state).
- the near-infrared shielding film of the present invention comprises a resin A: a hydroxy group having an acid value of less than 0.5 mgKOH / g and a hydroxy value in the range of 5 to 60 mgKOH / g. And a resin having at least a carboxy group having an acid value in the range of 1 to 60 mgKOH / g, or a resin C having an acid value of 1 mgKOH / g or more.
- the resin A, the resin B, and the resin C are preferably acrylic resins, and each of them is an acrylic adhesive resin, and the constituent layer containing the resin has a near infrared shielding effect of the near infrared shielding film. From the viewpoint of being suitably used, it is preferable.
- Acrylic resin having a hydroxy group as a main cross-linking group An acrylic resin having a hydroxy group as a main cross-linking group (hereinafter also referred to as a hydroxy group-type acrylic resin) has an acid value.
- a-3 copolymerizable with the above (a-1) or (a-2) may be contained as long as the effects of the present invention are not impaired.
- the hydroxy value is preferably in the range of 10 to 40 mgKOH / g, and more preferably in the range of 10 to 30 mgKOH / g.
- the acrylic acid alkyl ester include C1-15 linear, branched or cyclic alkyl esters of acrylic acid.
- methacrylic acid alkyl ester examples include C1-15 linear, branched or cyclic alkyl esters of methacrylic acid, such as methyl methacrylate, ethyl methacrylate, methacrylate-n-propyl, isopropyl methacrylate, Examples include methacrylic acid-n-butyl, methacrylic acid-sec-butyl, methacrylic acid-t-butyl, methacrylic acid-n-pentyl, isoamyl methacrylate, dodecyl methacrylate, isobornyl methacrylate, cyclohexyl methacrylate and the like.
- an alkyl acrylate ester having an alkyl group having 4 to 8 carbon atoms (C) since the adhesive strength and flexibility of the resulting adhesive are improved.
- acrylic acid-n-butyl, acrylic Acid-2-ethylhexyl is preferred.
- Monomers having a hydroxy group copolymerizable with (a-1) include acrylic acid-2-hydroxyethyl, methacrylic acid -2-hydroxyethyl, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 3-hydroxybutyl acrylate, 3-hydroxybutyl methacrylate, 2-hydroxy-3-chloropropyl acrylate, Examples thereof include hydroxy group-containing monomers such as methacrylic acid-2-hydroxy-3-chloropropyl, acrylic acid-2-hydroxy-3-phenoxypropyl, and methacrylic acid-2-hydroxy-3-phenoxypropyl.
- Other monomers copolymerizable with the above (a-1) or (a-2) include acrylic monomers
- the acid value is less than 0.5 mgKOH / g and the hydroxy value can be adjusted within the range of 5 to 60 mgKOH / g, and a small amount of addition may be performed to improve the adhesiveness.
- numerator is mentioned.
- acrylic acid methacrylic acid, acrylic- ⁇ -carboxyethyl, methacrylic acid- ⁇ -carboxyethyl, acrylic acid-5-carboxypentyl, methacrylic acid-5-carboxypentyl, succinic acid monoacryloyloxyethyl ester, ⁇ -carboxyl
- carboxy group-containing monomers such as polycaprolactone monoacrylate, ⁇ -carboxypolycaprolactone monomethacrylate, itaconic acid, crotonic acid, fumaric acid and maleic acid.
- numerator is mentioned.
- numerator is mentioned.
- methacrylic acid alkoxyesters methacrylic acid-2-methoxyethyl, methacrylic acid-2-ethoxyethyl, methacrylic acid-2-methoxypropyl, methacrylic acid-3-methoxypropyl, methacrylic acid-2-methoxybutyl, methacrylic acid-4-methoxybutyl
- methacrylic acid alkoxyesters methacrylic acid-2-methoxyethyl, methacrylic acid-2-e
- alkylene glycol acrylates such as ethylene glycol acrylate, polyethylene glycol acrylate, propylene glycol acrylate, and polypropylene glycol acrylate.
- numerator examples thereof include alkylene glycol methacrylates such as ethylene glycol methacrylate, polyethylene glycol methacrylate, propylene glycol methacrylate, and polypropylene glycol methacrylate.
- numerator examples thereof include aryl acrylates such as benzyl acrylate, phenoxyethyl acrylate, and phenyl acrylate.
- numerator examples thereof include aryl methacrylate such as benzyl methacrylate, phenoxyethyl methacrylate, and phenyl methacrylate.
- Acrylic resin having carboxy group as main crosslinking group (hereinafter also referred to as carboxy group type acrylic resin) Is an acrylic resin having an acid value of 1 to 60 mgKOH / g, preferably 5 to 30 mgKOH / g, more preferably 5 to 20 mgKOH / g, and still more preferably 5 to 10 mgKOH / g.
- carboxy group type acrylic resin Is an acrylic resin having an acid value of 1 to 60 mgKOH / g, preferably 5 to 30 mgKOH / g, more preferably 5 to 20 mgKOH / g, and still more preferably 5 to 10 mgKOH / g.
- the removability with reworkability improves by making the acid value of this resin into 60 mgKOH / g or less.
- the acrylic resin having a carboxy group as a main crosslinking group is a resin having an acid value in the range of 1 to 60 mgKOH / g, and is repeatedly derived from (meth) acrylic acid or other carboxy group-containing monomers.
- a (meth) acrylic adhesive polymer containing units may be mentioned. For example, a copolymer obtained by polymerizing two or more monomers containing (meth) acrylic acid and optionally other monomers, or a (meth) acrylate and non- (meth) acrylate-based carboxy group-containing monomer And a copolymer obtained by polymerizing two or more monomers including other monomers.
- a copolymer using two or more kinds of (meth) acrylic acid having about an alkyl group and (meth) acrylic acid alkyl ester monomer having an alkyl group having about 1 to 18 carbon atoms is generally used. is there.
- Examples of the monomer having a carboxy group as a repeating unit of the acrylic resin include carboxy groups such as (meth) acrylic acid, itaconic acid, crotonic acid, maleic acid, monobutyl maleate, vinyl acetic acid, and ⁇ -carboxyethyl acrylate.
- the vinyl monomer to contain can be mentioned.
- the acrylic resin used in the present invention may be copolymerized with a monomer having another functional group within a range not impairing the characteristics of the acrylic resin.
- monomers having other functional groups include monomers containing hydroxy groups such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate and allyl alcohol; (meth) acrylamide, N- Monomers containing amide groups such as methyl (meth) acrylamide and N-ethyl (meth) acrylamide; Monomers containing amide groups and methylol groups such as N-methylol (meth) acrylamide and dimethylol (meth) acrylamide; aminomethyl Monomers having functional groups such as amino group-containing monomers such as (meth) acrylate, dimethylaminoethyl (meth) acrylate and vinylpyridine; epoxy group-containing monomers such as allyl glycidyl ether and (meth) acrylic acid glycidy
- fluorine-substituted (meth) acrylic acid alkyl ester, (meth) acrylonitrile and the like, vinyl group-containing aromatic compounds such as styrene and methylstyrene, vinyl acetate, and vinyl halide compounds can be used.
- a monomer that becomes a repeating unit of the acrylic resin used in the present invention in addition to the monomer having a functional group other than the carboxy group as described above, another monomer having an ethylenic double bond should be used.
- monomers having an ethylenic double bond include diesters of ⁇ , ⁇ -unsaturated dibasic acids such as dibutyl maleate, dioctyl maleate and dibutyl fumarate; vinyl esters such as vinyl acetate and vinyl propionate.
- a compound having two or more ethylenic double bonds may be used in combination.
- examples of such compounds include divinylbenzene, diallyl malate, diallyl phthalate, ethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, methylenebis (meth) acrylamide, and the like.
- alkoxyalkyl esters of (meth) acrylic acid include 2-methoxyethyl (meth) acrylate, methoxyethyl (meth) acrylate, 2-methoxypropyl (meth) acrylate, and 3-methoxypropyl (meth) acrylate.
- acrylic adhesive resins having a carboxy group include, for example, trade names: Coponil 5705-L, 5407, N-2147, 5698 (above, Nippon Synthetic Chemical Industry Co., Ltd.), trade name: Cybinol AT -361 (manufactured by Syden Chemical Co., Ltd.), trade name: PE123 (manufactured by Nippon Carbide Industries Co., Ltd.), trade name: SK Dyne SK2094 SK1850G, SK2006, SK1888, SK1831, SK1863 (above, produced by Soken Chemical Co., Ltd.) And the like are preferably used from the viewpoint of low haze and adhesive strength.
- the hydroxy group / carboxy group type acrylic resin is a resin having an acid value of 1 mgKOH / g or more and a hydroxy value in the range of 5 to 60 mgKOH / g.
- the acid value is preferably in the range of 1 to 30 mg KOH / g, and preferably in the range of 5 to 10 mg KOH / g from the viewpoint of improving the dispersibility of the fine particles and reducing the initial haze.
- acrylic resin (c) examples include a copolymer of the monomer mentioned in the above (a-1) or (a-2) and a monomer having an unsaturated bond having one or more carboxy groups in the molecule. It is done.
- acrylic acid methacrylic acid, acrylic- ⁇ -carboxyethyl, methacrylic acid- ⁇ -carboxyethyl, acrylic acid-5-carboxypentyl, methacrylic acid-5-carboxypentyl, succinic acid monoacryloyloxyethyl ester, ⁇ -carboxyl
- carboxy group-containing monomers such as polycaprolactone monoacrylate, ⁇ -carboxypolycaprolactone monomethacrylate, itaconic acid, crotonic acid, fumaric acid and maleic acid.
- a copolymer obtained by copolymerizing a monomer having a carboxy group and a monomer not having a carboxy group used in preparing the above-described (b) carboxy group type acrylic resin at an appropriate copolymerization ratio is used. It is preferable to prepare it. Thereby, desired physical properties such as control of hydroxy value and acid value can be imparted to an acrylic resin of a type having both a hydroxy group and a carboxy group in one molecule.
- Examples of the monomer having no carboxy group used herein include (meth) acrylic acid alkyl ester monomers as described above, in particular, (meth) acrylic acid alkyl ester monomers having an alkyl group having about 1 to 18 carbon atoms. Can be mentioned.
- the resin A, resin B, and resin C according to the present invention are preferably mixed with a curing agent to form a binder.
- the curing agent examples include a curing agent selected from an epoxy crosslinking agent, a metal chelate crosslinking agent, and an isocyanate crosslinking agent.
- an isocyanate-based crosslinking agent is preferable, and it is particularly preferable to use an isocyanate-based crosslinking agent and a metal chelate crosslinking agent in combination.
- isocyanate-based crosslinking agent examples include tolylene diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, chlorophenylene diisocyanate, hexahethylene diisocyanate, tetramethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, tetrameryl.
- Polyisocyanate compounds having two or more isocyanate groups in the molecule such as xylylene diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, polymethylene polyphenyl isocyanate; addition of them with polyhydric alcohols such as trimethylolpropane and pentaerythritol Of these polyisocyanate compounds Turret type compounds and isocyanurate compounds; these polyisocyanate compounds and two or more isocyanates in a urethane prepolymer type molecule subjected to addition reaction with known polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols, etc. And a compound having a group.
- epoxy crosslinking agent examples include bisphenol A epichlorohydrin type epoxy resin, ethylene glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6-hexanediol glycidyl ether, and trimethylolpropane.
- examples include compounds having two or more epoxy groups in the molecule.
- metal chelate crosslinking agent examples include acetylene and ethyl acetoacetate coordinated to polyvalent metals such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium. Compounds.
- a coating solution for forming a near-infrared shielding layer formed by adding a hydroxy group-type acrylic adhesive resin and the above curing agent to the above-described dispersion for forming an infrared shielding film is applied on a transparent substrate surface.
- a film is formed and the coating film is aged to remove the solvent in the coating film and cause a crosslinking reaction of the acrylic adhesive resin to form the infrared shielding layer.
- An example of the aging process is a process of applying a temperature at which the crosslinking reaction proceeds.
- the near-infrared shielding film of the present invention can be obtained by using oxide fine particles D: tungsten oxide fine particles or composite tungsten oxide fine particles as an infrared absorber. Infrared shielding effect.
- the tungsten oxide fine particles or the composite tungsten oxide fine particles can absorb the entire near-infrared band with a light wavelength of 800 to 1100 nm only by the tungsten oxide fine particles or the composite tungsten oxide fine particles.
- the fine particles are tungsten oxide fine particles represented by the general formula W y O z (W is tungsten, O is oxygen, 2.2 ⁇ z / y ⁇ 3.0), or the general formula M x W y O z. (However, M is H, He, alkali metal, alkaline earth metal, rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au.
- Examples of the tungsten oxide fine particles represented by the general formula W y O z (2.2 ⁇ z / y ⁇ 3.0) include W 18 O 49 , W 20 O 58 , and W 4 O 11. it can. If the value of z / y is 2.2 or more, it is possible to completely avoid the appearance of an undesired WO 2 crystal phase in the infrared shielding material and to obtain the chemical stability of the material. Can do. On the other hand, if the value of z / y is 2.999 or less, a sufficient amount of free electrons is generated and an efficient infrared shielding material is obtained.
- a WyOz compound having a z / y range of 2.45 ⁇ z / y ⁇ 2.999 is a compound called a so-called Magneli phase and has excellent durability.
- the composite tungsten oxide fine particles represented by the general formula M x W y O z (0.001 ⁇ x / y ⁇ 1.0, 2.2 ⁇ z / y ⁇ 3.0) include hexagonal crystals, Since it has excellent durability when it has a tetragonal or cubic crystal structure, it preferably has one or more crystal structures selected from hexagonal, tetragonal and cubic crystals.
- preferable M elements include Cs, Rb, K, Ti, In, Ba, Li, Ca, Sr, Fe, and Sn. Examples thereof include composite tungsten oxide fine particles containing one or more selected elements.
- the addition amount x of the M element added at this time is preferably 0.001 or more and 1 or less in x / y, and more preferably around 0.33. This is because the value of x / y calculated theoretically from the hexagonal crystal structure is 0.33, and preferable optical characteristics can be obtained with the addition amount before and after this.
- the abundance z of oxygen is preferably 2.2 or more and 3.0 or less in z / y. Typical examples include Cs 0.33 WO 3 , Rb 0.33 WO 3 , K 0.33 WO 3 , Ba 0.33 WO 3 and the like, but x, y, and z are in the above ranges. As long as it falls within the range, useful near infrared absorption and infrared shielding properties can be obtained.
- tungsten oxide fine particles and composite tungsten oxide fine particles may be used alone or in combination.
- the average dispersed particle size is preferably 800 nm or less, more preferably. Is 200 nm or less, more preferably 100 nm or less.
- the average dispersed particle diameter of tungsten oxide or composite tungsten oxide exceeds 800 nm, light in the visible light region having a wavelength of 380 nm to 780 nm is scattered by geometrical scattering or Mie scattering.
- the average dispersed particle size is 200 nm or less, geometric scattering or Mie scattering is reduced, and a Rayleigh scattering region is obtained.
- the scattered light decreases in inverse proportion to the sixth power of the average dispersed particle size, so that visible light scattering is reduced and transparency is improved. Further, it is preferable that the average dispersed particle diameter is 100 nm or less because scattered light is extremely reduced. Further, when the average dispersed particle size is 800 nm or less, the haze also decreases as the average dispersed particle size decreases.
- the content of the tungsten oxide fine particles or composite tungsten oxide fine particles in the constituent layer is preferably 1 to 80% by mass and more preferably 5 to 50% by mass with respect to the total mass of the constituent layer. If the content is 1% or more, a sufficient near-infrared shielding effect appears, and if it is 80% or less, a sufficient amount of visible light can be transmitted.
- the near-infrared shielding film of the present invention comprises (a), at least one of (b) or (c) according to the present invention, and a constituent layer containing (d). However, it is preferably an adhesive layer having a near-infrared shielding function.
- the thickness of the adhesive layer is preferably in the range of 0.1 to 50 ⁇ m, more preferably in the range of 1 to 20 ⁇ m. If it is 0.1 ⁇ m or more, the infrared absorption ability tends to be improved, while if it is 50 ⁇ m or less, the crack resistance of the coating film is improved.
- the method for forming the adhesive layer is not particularly limited. For example, after preparing a coating solution for the adhesive layer containing each component of the resin and fine particles, the coating solution is applied using a wire bar or the like, dried, heated, etc. Can be obtained by curing the resin.
- the coating solution for the adhesive layer containing the resin and fine particle components according to the present invention can be prepared by the following steps.
- the tungsten oxide fine particles or composite tungsten oxide fine particle dispersion according to the present invention is, for example, an essential component of tungsten oxide fine particles or composite tungsten oxide fine particles. Can be obtained by mixing with an appropriate amount of a solvent together with a dispersant as required, and appropriately dispersing as required.
- (3) Preparation of adhesive layer composition The target adhesive layer composition is obtained by mixing and sufficiently stirring the tungsten oxide fine particles or composite tungsten oxide fine particle dispersion and the resin-containing varnish.
- the production method for producing the near-infrared shielding film of the present invention particularly comprises the oxide fine particles D: tungsten oxide fine particles or composite tungsten oxide fine particles, wherein (a) the acid value is less than 0.5 mg KOH / g, and After dispersion in a resin having a hydroxy value in the range of 5 to 60 mgKOH / g, resin B: resin or resin in which the acid value is in the range of 1 to 60 mgKOH / g or resin C: the acid value is 1 mgKOH / g or more In addition, it is preferable to add a resin having a hydroxy value in the range of 5 to 60 mgKOH / g from the viewpoint of obtaining an effect of reducing the initial haze. This is presumed that the oxide fine particles D are first dispersed in the resin A, whereby aggregation during dispersion of the fine particles can be suppressed.
- the solvent examples include ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone (MIBK), cyclohexanone, diacetone alcohol, etc.), ethers (dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (hexane, etc.), alicyclic Hydrocarbons (cyclohexane, etc.), aromatic hydrocarbons (toluene, xylene, etc.), halogenated carbons (dichloromethane, dichloroethane, etc.), esters (methyl formate, methyl acetate, ethyl acetate, butyl acetate, etc.), water, Alcohols (ethanol, isopropanol, butanol, cyclohexanol, etc.), cellosolves (methyl cellosolve, ethyl cellosolve, butyl cellosolve, etc.), cellosolve a
- the adhesive layer coating liquid having near infrared shielding properties according to the present invention may further include a metal deactivator, a plasticizer, and an antioxidant, as long as the effects of the present invention are not impaired.
- a metal deactivator e.g., a metal deactivator, a plasticizer, and an antioxidant, as long as the effects of the present invention are not impaired.
- One or more agents, fillers, silane coupling agents and the like may be contained.
- the dispersant adsorbs to the fine particles to be dispersed and makes the aggregated fine particles easy to wet with a solvent, etc., thereby promoting the primary particle formation of fine particles, preventing aggregation, lowering viscosity, improving fluidity, preventing sedimentation, etc. It has a function.
- known resin-type dispersants and inorganic dispersants can be appropriately used.
- the resin-type dispersant has a fine particle affinity portion having a property of adsorbing to fine particles and a portion compatible with the resin and solvent, and functions to adsorb to the fine particles and stabilize dispersion in the resin and solvent. It is something to do. It also functions to increase the surface charge of the fine particles and increase the repulsive force between particles due to steric hindrance (excluded volume effect).
- resin type dispersant examples include polycarboxylic acid esters such as polyurethane and polyacrylate, unsaturated polyamide, polycarboxylic acid, polycarboxylic acid (partial) amine salt, polycarboxylic acid ammonium salt, polycarboxylic acid alkylamine salt, Polysiloxane, long-chain polyaminoamide phosphate, hydroxyl group-containing polycarboxylic acid ester, modified products thereof, amides formed by reaction of poly (lower alkyleneimine) and polyester having a free carboxy group, and salts thereof Is used.
- polycarboxylic acid esters such as polyurethane and polyacrylate, unsaturated polyamide, polycarboxylic acid, polycarboxylic acid (partial) amine salt, polycarboxylic acid ammonium salt, polycarboxylic acid alkylamine salt, Polysiloxane, long-chain polyaminoamide phosphate, hydroxyl group-containing polycarboxylic acid ester,
- water-soluble resins such as (meth) acrylic acid-styrene copolymer, (meth) acrylic acid- (meth) acrylic acid ester copolymer, styrene-maleic acid copolymer, polyvinyl alcohol, and polyvinylpyrrolidone Polymer compounds, polyesters, modified polyacrylates, ethylene oxide / propylene oxide adducts, and the like are used. These can be used individually or in mixture of 2 or more types.
- examples of the inorganic dispersant include phosphoric acid compounds such as sodium hexametaphosphate and sodium pyrophosphate, and silicate compounds such as sodium silicate and potassium silicate.
- the surfactant plays a role of assisting the function of the dispersant.
- surfactant examples include sodium lauryl sulfate, polyoxyethylene alkyl ether sulfate, sodium dodecylbenzene sulfonate, alkali salt of styrene-acrylic acid copolymer, sodium stearate, sodium alkyl naphthalene sulfonate, alkyl diphenyl ether disulfone.
- Anionic surfactants such as sodium acid, lauryl sulfate monoethanolamine, lauryl sulfate triethanolamine, ammonium lauryl sulfate, monoethanolamine stearate, sodium stearate, monoethanolamine of styrene-acrylic acid copolymer; polyoxyethylene Oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene sorbitan monostearate
- Nonionic surfactants such as acrylate and polyethylene glycol monolaurate; Chaotic surfactants such as alkyl quaternary ammonium salts and their ethylene oxide adducts; Amphoterics such as alkylbetaines such as alkyldimethylaminoacetic acid betaines and alkylimidazolines Surfactants; silicone surfactants; fluorine surfactants, and the like. These may be used alone or in admixture of two or more.
- surfactants include polyoxyethylene alkyl ethers such as polyoxyethylene stearyl ether; polyoxyethylene alkyl phenyl ethers such as polyoxyethylene octylphenyl ether; polyethylene such as polyethylene glycol dilaurate and polyethylene glycol distearate Polymeric surfactants such as glycol diesters; sorbitan fatty acid esters; fatty acid-modified polyesters; tertiary amine-modified polyurethanes can be used, and these can be used alone or in admixture of two or more.
- any known method can be used.
- the prepared coating liquid for adhesive layer Preferred examples include a die coater method, a gravure roll coater method, a blade coater method, a spray coater method, an air knife coat method, a dip coat method, and a transfer method, and these can be used alone or in combination.
- the near-infrared heat-shielding film of the present invention has a near-infrared reflective layer, an easily adhesive layer, a conductive layer, Antistatic layer, gas barrier layer, antifouling layer, deodorant layer, droplet layer, slippery layer, hard coat layer, wear-resistant layer, electromagnetic wave shielding layer, ultraviolet absorption layer, printing layer, fluorescent light emitting layer, hologram layer A release layer or the like may be provided.
- a release layer (referred to as a release film or a separator) that protects the near-infrared reflective layer, the hard coat layer, and the adhesive layer.
- the near-infrared shielding film of the present invention provides 20% light with a wavelength of 800 to 1300 nm on at least one surface of the transparent substrate provided with the constituent layer (adhesive layer). It is preferable to have a near-infrared reflective layer that reflects the above.
- the layer for reflecting near-infrared rays according to the present invention is not particularly limited, and is a commercially available infrared reflective film (3M Scotch Tent (registered trademark) multi-product manufactured by 3M Corporation described in US Pat. No. 6,049,419.
- Layer NANO series a transparent infrared reflective film having a light transmittance of less than 20% in a light wavelength range of 850 to 1100 nm, and a multilayer film described in JP 2012-81748 A (2 having different optical properties)
- a high refractive index layer and a low refractive index containing a metal oxide and a binder described in Table 2012/057199 It can be used a near infrared ray reflection film or the like is formed by laminating multiple layers of alternating layers.
- the near-infrared reflective layer according to the present invention includes a high refractive index layer containing the first water-soluble binder resin and the first metal oxide particles, and the second water-soluble binder resin and the second metal oxide.
- a layer in which a large number of low refractive index layers containing physical particles are alternately laminated is preferable.
- the near-infrared reflective layer used in the present invention may have any structure including at least one laminate (unit) composed of a high refractive index layer and a low refractive index layer. It is preferable to have a configuration in which two or more of the above laminates composed of low refractive index layers are laminated.
- the uppermost layer and the lowermost layer of the near-infrared reflective layer may be either a high refractive index layer or a low refractive index layer, but both the uppermost layer and the lowermost layer are preferably low refractive index layers.
- the uppermost layer is a low refractive index layer, the coating property is improved, and when the lowermost layer is a low refractive index layer, it is preferable from the viewpoint of improving the adhesion to the substrate.
- an arbitrary refractive index layer of the near-infrared reflective layer is a high refractive index layer or a low refractive index layer is determined by comparing the refractive index with the adjacent refractive index layer. Specifically, when a refractive index layer is used as a reference layer, if the refractive index layer adjacent to the reference layer has a lower refractive index than the reference layer, the reference layer is a high refractive index layer (the adjacent layer is a low refractive index layer).
- the refractive index of the adjacent layer is higher than that of the reference layer, it is determined that the reference layer is a low refractive index layer (the adjacent layer is a high refractive index layer). Therefore, whether the refractive index layer is a high refractive index layer or a low refractive index layer is a relative one determined by the relationship with the refractive index of the adjacent layer. Depending on the relationship, it can be a high refractive index layer or a low refractive index layer.
- high refractive index layer component there are two components constituting the high refractive index layer (hereinafter also referred to as “high refractive index layer component”) and components constituting the low refractive index layer (hereinafter also referred to as “low refractive index layer component”).
- low refractive index layer component a layer (mixed layer) containing the high refractive index layer component and the low refractive index layer component is mixed at the interface of the two layers.
- a set of portions where the high refractive index layer component is 50% by mass or more is defined as a high refractive index layer
- a set of portions where the low refractive index layer component exceeds 50% by mass is defined as a low refractive index layer.
- the concentration profile of the metal oxide particles in the layer thickness direction in these laminated films can determine whether the mixed layer that can be formed is a high refractive index layer or a low refractive index layer.
- the concentration profile of the metal oxide particles in the laminated film is sputtered at a rate of 0.5 nm / min using the XPS surface analyzer, etching from the surface to the depth direction, with the outermost surface being 0 nm. It can be observed by measuring the atomic composition ratio.
- the metal oxide particles are not contained in the low refractive index component or the high refractive index component and are formed only from the water-soluble resin, similarly, in the concentration profile of the water-soluble resin, for example, It was confirmed that the mixed region was present by measuring the carbon concentration in the layer thickness direction, and further, its composition was measured by EDX (energy dispersive X-ray spectroscopy), and was etched by sputtering.
- EDX energy dispersive X-ray spectroscopy
- the XPS surface analyzer is not particularly limited, and any model can be used, but ESCALAB-200R manufactured by VG Scientific Fix Co. was used. Mg is used for the X-ray anode, and measurement is performed at an output of 600 W (acceleration voltage: 15 kV, emission current: 40 mA).
- the difference in refractive index between the adjacent low refractive index layer and high refractive index layer is 0.1 or more.
- it is 0.3 or more, more preferably 0.35 or more, and particularly preferably more than 0.4.
- the near-infrared reflective layer has two or more laminates (units) of a high refractive index layer and a low refractive index layer, the refraction of the high refractive index layer and the low refractive index layer in all the laminates (units) It is preferable that the rate difference is within the preferable range.
- the refractive index layer constituting the uppermost layer or the lowermost layer of the near-infrared reflective layer may be configured outside the above-described preferred range.
- the number of refractive index layers of the near-infrared reflective layer (units of high refractive index layer and low refractive index layer) is preferably 100 layers or less, that is, 50 units or less, and 40 layers (20 Unit) or less, more preferably 20 layers (10 units) or less.
- the refractive index ratio between the layers Since the reflection at the interface between adjacent layers depends on the refractive index ratio between the layers, the higher the refractive index ratio, the higher the reflectance.
- n is the refractive index
- d is the physical film thickness of the layer
- n ⁇ d is the optical film thickness.
- 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 near-infrared shielding film of the present invention is used as a heat-shielding window film
- a multilayer film in which films having different refractive indexes are laminated on a polymer film is formed, and the visible light region shown in JIS R3106-1998 is formed. It is preferable to design the optical film thickness and unit so that the transmittance is 50% or more and the region having a wavelength of 900 to 1400 nm has a region exceeding the reflectance of 40%.
- the high refractive index layer contains the first water-soluble binder resin and the first metal oxide particles, and may contain a curing agent, other binder resin, a surfactant, and various additives as necessary. Good.
- the refractive index of the high refractive index layer according to the present invention is preferably 1.80 to 2.50, more preferably 1.90 to 2.20.
- the first water-soluble binder resin according to the present invention has a G2 glass filter (maximum pores of 40 to 50 ⁇ m) when dissolved in water at a concentration of 0.5% by mass at the temperature at which the water-soluble binder resin is most dissolved.
- the mass of the insoluble matter that is filtered off when filtered in ()) is within 50 mass% of the added water-soluble binder resin.
- the weight average molecular weight of the first water-soluble binder resin according to the present invention is preferably in the range of 1,000 to 200,000. Further, it is more preferably within the range of 3000 to 40000.
- the weight average molecular weight referred to in the present invention can be measured by a known method, for example, static light scattering, gel permeation chromatography (GPC), time-of-flight mass spectrometry (TOF-MASS), etc. In the present invention, it is measured by a gel permeation chromatography method which is a generally known method.
- GPC gel permeation chromatography
- TOF-MASS time-of-flight mass spectrometry
- the content of the first water-soluble binder resin in the high refractive index layer is preferably within the range of 5 to 50% by mass with respect to the solid content of 100% by mass of the high refractive index layer. It is more preferable to be within the range.
- the first water-soluble binder resin applied to the high refractive index layer is preferably polyvinyl alcohol.
- the water-soluble binder resin which exists in the low-refractive-index layer mentioned later is also polyvinyl alcohol. Therefore, in the following, polyvinyl alcohol contained in the high refractive index layer and the low refractive index layer will be described together.
- the high refractive index layer and the low refractive index layer preferably contain two or more types of polyvinyl alcohol having different saponification degrees.
- polyvinyl alcohol as a water-soluble binder resin used in the high refractive index layer is polyvinyl alcohol (A)
- polyvinyl alcohol as a water-soluble binder resin used in the low refractive index layer is polyvinyl alcohol (B). That's it.
- each refractive index layer contains a plurality of polyvinyl alcohols having different saponification degrees and polymerization degrees
- the polyvinyl alcohol having the highest content in each refractive index layer is changed to polyvinyl alcohol (A ) And polyvinyl alcohol (B) in the low refractive index layer.
- the “degree of saponification” is the ratio of hydroxy groups to the total number of acetyloxy groups (derived from the starting vinyl acetate) and hydroxy groups in polyvinyl alcohol.
- the degree of polymerization is calculated assuming that the polyvinyl alcohol having a saponification degree difference of 3 mol% or less is the same polyvinyl alcohol. .
- a low polymerization degree polyvinyl alcohol having a polymerization degree of 1000 or less is a different polyvinyl alcohol (even if there is a polyvinyl alcohol having a saponification degree difference of 3 mol% or less, it is not regarded as the same polyvinyl alcohol).
- polyvinyl alcohol having a saponification degree of 90 mol%, a saponification degree of 91 mol%, and a saponification degree of 93 mol% is contained in the same layer by 10 mass%, 40 mass%, and 50 mass%, respectively.
- These three polyvinyl alcohols are the same polyvinyl alcohol, and these three mixtures are polyvinyl alcohol (A) or (B).
- the above-mentioned “polyvinyl alcohol having a saponification degree difference of 3 mol% or less” suffices to be within 3 mol% when attention is paid to any polyvinyl alcohol.
- the difference in the absolute value of the saponification degree between the polyvinyl alcohol (A) and the polyvinyl alcohol (B) is preferably 3 mol% or more, and more preferably 5 mol% or more. If it is such a range, since the interlayer mixing state of a high refractive index layer and a low refractive index layer will become a preferable level, it is preferable. Moreover, although the difference of the saponification degree of polyvinyl alcohol (A) and polyvinyl alcohol (B) is so preferable that it is separated, it is 20 mol% or less from the viewpoint of the solubility to water of polyvinyl alcohol. It is preferable.
- the saponification degree of polyvinyl alcohol (A) and polyvinyl alcohol (B) is preferably 75 mol% or more from the viewpoint of solubility in water. Furthermore, the intermixed state of the high refractive index layer and the low refractive index layer is that one of the polyvinyl alcohol (A) and the polyvinyl alcohol (B) has a saponification degree of 90 mol% or more and the other is 90 mol% or less. Is preferable for achieving a preferable level. It is more preferable that one of the polyvinyl alcohol (A) and the polyvinyl alcohol (B) has a saponification degree of 95 mol% or more and the other is 90 mol% or less. In addition, although the upper limit of the saponification degree of polyvinyl alcohol is not specifically limited, Usually, it is less than 100 mol% and is about 99.9 mol% or less.
- the polymerization degree of the two types of polyvinyl alcohols having different saponification degrees is preferably 1000 or more, particularly preferably those having a polymerization degree in the range of 1500 to 5000, more preferably in the range of 2000 to 5000. Those are more preferably used. This is because when the polymerization degree of polyvinyl alcohol is 1000 or more, there is no cracking of the coating film, and when it is 5000 or less, the coating solution is stabilized. In the present specification, “the coating solution is stable” means that the coating solution is stable over time.
- the degree of polymerization of at least one of polyvinyl alcohol (A) and polyvinyl alcohol (B) is in the range of 2000 to 5000, it is preferable because cracks in the coating film are reduced and the reflectance at a specific wavelength is improved. It is preferable that both the polyvinyl alcohol (A) and the polyvinyl alcohol (B) are 2000 to 5000, since the above effects can be exhibited more remarkably.
- Polymerization degree P in the present specification refers to a viscosity average degree of polymerization, measured according to JIS K6726 (1994), and measured in water at 30 ° C. after completely re-saponifying and purifying PVA. From the intrinsic viscosity [ ⁇ ] (dl / g), it is obtained by the following formula (1).
- the polyvinyl alcohol (B) contained in the low refractive index layer preferably has a saponification degree in the range of 75 to 90 mol% and a polymerization degree in the range of 2000 to 5000.
- polyvinyl alcohol having such characteristics is contained in the low refractive index layer, it is preferable in that interfacial mixing is further suppressed. This is considered to be because there are few cracks of a coating film and set property improves.
- the polyvinyl alcohol (A) and (B) used in the present invention may be a synthetic product or a commercially available product.
- Examples of commercially available products used as the polyvinyl alcohol (A) and (B) include, for example, PVA-102, PVA-103, PVA-105, PVA-110, PVA-117, PVA-120, PVA-124, PVA -203, PVA-205, PVA-210, PVA-217, PVA-220, PVA-224, PVA-235 (manufactured by Kuraray Co., Ltd.), JC-25, JC-33, JF-03, JF-04 , JF-05, JP-03, JP-04JP-05, JP-45 (above, manufactured by Nihon Vinegar Pover Co., Ltd.) and the like.
- modified polyvinyl alcohol partially modified May be included.
- modified polyvinyl alcohol include cation-modified polyvinyl alcohol, anion-modified polyvinyl alcohol, nonionic-modified polyvinyl alcohol, and vinyl alcohol polymers.
- Examples of the cation-modified polyvinyl alcohol include primary to tertiary amino groups and quaternary ammonium groups in the main chain or side chain of the polyvinyl alcohol as described in JP-A-61-10383. It is obtained by saponifying a copolymer of an ethylenically unsaturated monomer having a cationic group and vinyl acetate.
- Examples of the ethylenically unsaturated monomer having a cationic group include trimethyl- (2-acrylamido-2,2-dimethylethyl) ammonium chloride and trimethyl- (3-acrylamido-3,3-dimethylpropyl) ammonium chloride.
- the ratio of the cation-modified group-containing monomer in the cation-modified polyvinyl alcohol is 0.1 to 10 mol%, preferably 0.2 to 5 mol%, relative to vinyl acetate.
- Anion-modified polyvinyl alcohol is described in, for example, polyvinyl alcohol having an anionic group as described in JP-A-1-206088, JP-A-61-237681 and JP-A-63-307979.
- examples thereof include a copolymer of vinyl alcohol and a vinyl compound having a water-soluble group, and a modified polyvinyl alcohol having a water-soluble group as described in JP-A-7-285265.
- Nonionic modified polyvinyl alcohol includes, for example, a polyvinyl alcohol derivative in which a polyalkylene oxide group is added to a part of vinyl alcohol as described in JP-A-7-9758, and JP-A-8-25795.
- Block copolymer of vinyl compound having hydrophobic group and vinyl alcohol, silanol-modified polyvinyl alcohol having silanol group, reactive group modification having reactive group such as acetoacetyl group, carbonyl group and carboxy group Polyvinyl alcohol etc. are mentioned.
- vinyl alcohol polymers examples include EXEVAL (registered trademark, manufactured by Kuraray Co., Ltd.) and Nichigo G polymer (registered trademark, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.).
- Two or more kinds of modified polyvinyl alcohol can be used in combination, such as the degree of polymerization and the type of modification.
- the content of the modified polyvinyl alcohol is not particularly limited, but is preferably in the range of 1 to 30% by mass with respect to the total mass (solid content) of each refractive index. If it is in such a range, the said effect will be exhibited more.
- the polyvinyl alcohol (A) having a low saponification degree is used for the high refractive index layer and polyvinyl alcohol (B) having a high saponification degree is used for the low refractive index layer
- the polyvinyl alcohol ( A) is preferably contained in the range of 40% by mass to 100% by mass with respect to the total mass of all polyvinyl alcohols in the layer, more preferably 60% by mass to 95% by mass
- the low refractive index layer The polyvinyl alcohol (B) is preferably contained in the range of 40% by mass to 100% by mass with respect to the total mass of all the polyvinyl alcohols in the low refractive index layer, and 60% by mass to 95% by mass. Is more preferable.
- the polyvinyl alcohol (A) having a high saponification degree is used for the high refractive index layer and polyvinyl alcohol (B) having a low saponification degree is used for the low refractive index layer
- the polyvinyl alcohol ( A) is preferably contained in the range of 40% by mass to 100% by mass with respect to the total mass of all polyvinyl alcohols in the layer, more preferably 60% by mass to 95% by mass
- the low refractive index layer The polyvinyl alcohol (B) is preferably contained in the range of 40% by mass to 100% by mass with respect to the total mass of all the polyvinyl alcohols in the low refractive index layer, and 60% by mass to 95% by mass. More preferred.
- the content is 40% by mass or more, interlayer mixing is suppressed, and the effect of less disturbance of the interface appears remarkably. On the other hand, if content is 100 mass% or less, stability of a coating liquid will improve.
- the first water-soluble binder resin other than polyvinyl alcohol in the high refractive index layer, is not limited as long as the high refractive index layer containing the first metal oxide particles can form a coating film. But it can be used without restriction.
- the second water-soluble binder resin other than the polyvinyl alcohol (B) the low refractive index layer containing the second metal oxide particles is coated as described above. Any device can be used without limitation as long as it can be formed. However, in view of environmental problems and flexibility of the coating film, water-soluble polymers (particularly gelatin, thickening polysaccharides, polymers having reactive functional groups) are preferable. These water-soluble polymers may be used alone or in combination of two or more.
- the content of other binder resin used together with polyvinyl alcohol preferably used as the water-soluble binder resin is in the range of 5 to 50% by mass with respect to 100% by mass of the solid content of the high refractive index layer. It can also be used within.
- the binder resin is preferably composed of a water-soluble polymer. That is, in the present invention, a water-soluble polymer other than polyvinyl alcohol and modified polyvinyl alcohol may be used as the binder resin in addition to the polyvinyl alcohol and modified polyvinyl alcohol as long as the effect is not impaired.
- the water-soluble polymer is when it is filtered through a G2 glass filter (maximum pores 40-50 ⁇ m) when dissolved in water at a concentration of 0.5% by mass at the temperature at which the water-soluble polymer is most soluble.
- the mass of the insoluble matter separated by filtration is within 50% by mass of the added water-soluble polymer.
- gelatin, celluloses, thickening polysaccharides, or polymers having reactive functional groups are particularly preferable. These water-soluble polymers may be used alone or in combination of two or more.
- the first metal oxide particles applicable to the high refractive index layer are preferably metal oxide particles having a refractive index of 2.0 or more and 3.0 or less. More specifically, for example, titanium oxide, zirconium oxide, zinc oxide, alumina, colloidal alumina, lead titanate, red lead, yellow lead, zinc yellow, chromium oxide, ferric oxide, iron black, copper oxide, oxidation Examples thereof include magnesium, magnesium hydroxide, strontium titanate, yttrium oxide, niobium oxide, europium oxide, lanthanum oxide, zircon, and tin oxide. In addition, composite oxide particles composed of a plurality of metals, core / shell particles whose metal structure changes into a core / shell shape, and the like can also be used.
- the high refractive index layer includes metal oxide fine particles having a high refractive index such as titanium and zirconium, that is, titanium oxide fine particles and / or zirconia oxide. It is preferable to contain fine particles.
- titanium oxide is more preferable from the viewpoint of the stability of the coating liquid for forming the high refractive index layer.
- the rutile type tetragonal type
- the weather resistance of the high refractive index layer and adjacent layers is higher, and the refractive index is higher. Is more preferable.
- a curing agent can also be used to cure the first water-soluble binder resin applied to the high refractive index layer.
- a curing agent can also be used to cure the first water-soluble binder resin applied to the high refractive index layer.
- boric acid and its salt are preferable as the curing agent.
- 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 and the like.
- epoxy curing agents diglycidyl ethyl
- the content of the curing agent in the high refractive index layer is preferably 1 to 10% by mass and more preferably 2 to 6% by mass with respect to 100% by mass of the solid content of the high 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.
- the low refractive index layer according to the present invention includes a second water-soluble binder resin and second metal oxide particles, and further includes a curing agent, a surface coating component, a particle surface protective agent, a binder resin, a surfactant, Various additives may be included.
- the refractive index of the low refractive index layer according to the present invention is preferably in the range of 1.10 to 1.60, more preferably 1.30 to 1.50.
- Polyvinyl alcohol is preferably used as the second water-soluble binder resin applied to the low refractive index layer according to the present invention. Furthermore, it is more preferable that polyvinyl alcohol (B) different from the saponification degree of polyvinyl alcohol (A) present in the high refractive index layer is used in the low refractive index layer according to the present invention.
- polyvinyl alcohol (A) and polyvinyl alcohol (B), such as a preferable weight average molecular weight of 2nd water-soluble binder resin here is demonstrated by the water-soluble binder resin of the said high refractive index layer. The description is omitted here.
- the content of the second water-soluble binder resin in the low refractive index layer is preferably in the range of 20 to 99.9% by mass with respect to 100% by mass of the solid content of the low refractive index layer, and 25 to 80 More preferably, it is in the range of mass%.
- the content of the other binder resin used together with polyvinyl alcohol preferably used as the second water-soluble binder resin is 0 to 10 mass with respect to 100 mass% of the solid content of the low refractive index layer. % Can also be used.
- silica silicon dioxide
- specific examples thereof include synthetic amorphous silica and colloidal silica.
- the second metal oxide particles (preferably silicon dioxide) applied to the low refractive index layer preferably have an average particle size in the range of 3 to 100 nm.
- the average particle size of primary particles of silicon dioxide dispersed in a primary particle state is more preferably in the range of 3 to 50 nm, and in the range of 3 to 40 nm. Is more preferably 3 to 20 nm, and most preferably 4 to 10 nm.
- grains it is preferable from a viewpoint with few hazes and excellent visible light transmittance
- the average particle size of the metal oxide particles applied to the low refractive index layer is determined by observing the particles themselves or the particles appearing on the cross section or surface of the refractive index layer with an electron microscope and measuring the particle size of 1000 arbitrary particles.
- the simple average value (number average) is obtained.
- the particle diameter of each particle is represented by a diameter assuming a circle equal to the projected area.
- the colloidal silica used in the present invention is obtained by heating and aging a silica sol obtained by metathesis with an acid of sodium silicate or the like and passing through an ion exchange resin layer.
- colloidal silica may be a synthetic product or a commercially available product.
- the surface of the colloidal silica may be cation-modified, or may be treated with Al, Ca, Mg, Ba or the like.
- Hollow particles can also be used as the second metal oxide particles applied to the low refractive index layer.
- the average particle pore diameter is preferably within the range of 3 to 70 nm, more preferably within the range of 5 to 50 nm, and even more preferably within the range of 5 to 45 nm.
- the average particle pore diameter of the hollow particles is the average value of the inner diameters of the hollow particles.
- the refractive index of the low refractive index layer is sufficiently lowered.
- the average particle diameter is 50 or more at random, which can be observed as an ellipse in a circular, elliptical or substantially circular shape by electron microscope observation. Is obtained.
- the average particle hole diameter means the smallest distance among the distances between the outer edges of the hole diameter that can be observed as a circle, an ellipse, or a substantially circle or ellipse, between two parallel lines.
- the content of the second metal oxide particles in the low refractive index layer is preferably 0.1 to 70% by mass, and preferably 30 to 70% by mass with respect to 100% by mass of the solid content of the low refractive index layer. More preferably, it is more preferably 45 to 65% by mass.
- the low refractive index layer according to the present invention may further include a curing agent.
- a curing agent there is no particular limitation as long as it causes a curing reaction with the second water-soluble binder resin contained in the low refractive index layer.
- boric acid and its salt and / or borax are preferred as the curing agent when polyvinyl alcohol is used as the second water-soluble binder resin applied to the low refractive index layer.
- boric acid and its salts known ones can be used.
- the content of the curing agent in the low refractive index layer is preferably in the range of 1 to 10% by mass and preferably in the range of 2 to 6% by mass with respect to 100% by mass of the solid content of the low refractive index layer. It is more preferable.
- additives for each refractive index layer In the high refractive index layer and the low refractive index layer according to the present invention, various additives can be used as necessary.
- the content of the additive in the high refractive index layer is preferably 0 to 20% by mass with respect to 100% by mass of the solid content of the high refractive index layer.
- additives include surfactants, amino acids, emulsion resins, lithium compounds described in paragraphs [0140] to [0154] of JP2012-139948A, and other additives described in paragraph [0155] of the same publication. Can be mentioned.
- the method for forming the near-infrared reflective layer used in the present invention is preferably formed by applying a wet coating method. Furthermore, the first water-soluble binder resin and the first metal oxide are formed on the transparent substrate. A production method including a step of wet-coating a coating solution for a high refractive index layer containing particles and a coating solution for a low refractive index layer containing a second water-soluble binder resin and second metal oxide particles is preferable.
- the wet coating method is not particularly limited.
- a sequential multilayer application method or a simultaneous multilayer application method may be used as a method of applying a plurality of layers in a multilayer manner.
- the solvent applicable for preparing the coating solution for the high refractive index layer and the coating solution for the low refractive index layer is not particularly limited, but water, an organic solvent, or a mixed solvent thereof is preferable.
- organic solvent examples include alcohols such as methanol, ethanol, 2-propanol and 1-butanol, esters such as ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate and propylene glycol monoethyl ether acetate, diethyl ether and propylene.
- examples include ethers such as glycol monomethyl ether and ethylene glycol monoethyl ether, amides such as dimethylformamide and N-methylpyrrolidone, and ketones such as acetone, methyl ethyl ketone, acetylacetone and cyclohexanone. These organic solvents may be used alone or in combination of two or more.
- the solvent of the coating solution is particularly preferably water or a mixed solvent of water and methanol, ethanol, or ethyl acetate.
- the concentration of the water-soluble binder resin in the coating solution for the high refractive index layer is preferably in the range of 1 to 10% by mass.
- concentration of the metal oxide particles in the coating solution for the high refractive index layer is preferably in the range of 1 to 50% by mass.
- the concentration of the water-soluble binder resin in the coating solution for the low refractive index layer is preferably in the range of 1 to 10% by mass.
- the concentration of the metal oxide particles in the coating solution for the low refractive index layer is preferably in the range of 1 to 50% by mass.
- the method for preparing the coating solution for the high refractive index layer and the coating solution for the low refractive index layer is not particularly limited.
- a water-soluble binder resin, metal oxide particles, and other additives added as necessary The method of adding and stirring and mixing is mentioned.
- the order of addition of the water-soluble binder resin, the metal oxide particles, and other additives used as necessary is not particularly limited, and each component may be added and mixed sequentially while stirring. However, they may be added and mixed at once. If necessary, it is further adjusted to an appropriate viscosity using a solvent.
- the viscosity at 36 ° C. of the coating solution for the low refractive index layer when performing simultaneous multilayer coating by the slide hopper coating method is preferably within the range of 100 to 300 mPa ⁇ s, in order to improve the uniformity of the film, 180 to More preferably within the range of 250 mPa ⁇ s.
- the viscosity at 36 ° C. of the coating solution for the high refractive index layer is preferably in the range of 10 to 50 mPa ⁇ s, and more preferably in the range of 15 to 35 mPa ⁇ s.
- the slit interval of the coater when performing simultaneous multilayer coating by the slide hopper coating method is preferably in the range of 100 to 400 ⁇ m when casting the coating solution for the low refractive index layer, and preferably 200 to 350 ⁇ m. More preferably within the range.
- the coating solution for the high refractive index layer it is preferably in the range of 100 to 300 ⁇ m, and more preferably in the range of 180 to 250 ⁇ m.
- the coating and drying method is not particularly limited, but the high refractive index layer coating solution and the low refractive index layer coating solution are heated to 30 ° C. or higher, and the high refractive index layer coating solution and the low refractive index are coated on the substrate.
- 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. More preferable drying conditions are a wet bulb temperature of 5 to 50 ° C. and a film surface temperature of 10 to 50 ° C.
- the coating thickness of the coating solution for the high refractive index layer and the coating solution for the low refractive index layer is preferably in the range of 20 to 800 nm, and preferably in the range of 50 to 350 nm. More preferably, it is within. Further, the thickness per layer of the low refractive index layer is preferably in the range of 20 to 800 nm, and more preferably in the range of 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 thickness of the lowermost layer preferably the low refractive index layer
- the thickness after drying is preferably in the range of 400 to 1500 nm, and more preferably in the range of 950 to 1500 nm.
- the flow rate of the application liquid may be controlled so as to obtain a preferable thickness after drying as described above.
- the set means a step of increasing the viscosity of the coating composition and reducing the fluidity of substances in each layer and in each layer by means such as applying cold air to the coating to lower the temperature.
- a state in which the cold air is applied to the coating film from the surface and the finger is pressed against the surface of the coating film is defined as a set completion state.
- the time (setting time) from application of cold air to completion of setting is preferably within 5 minutes, preferably within 2 minutes. Further, the lower limit time is not particularly limited, but it is preferable to take 45 seconds or more. If the set time is too short, there are places where mixing of the components in the layer becomes insufficient. On the other hand, if the set time is too long, the interlayer diffusion of the metal oxide particles proceeds, and the difference in refractive index between the high refractive index layer and the low refractive index layer is insufficient. In addition, if the high elasticity of the heat ray blocking film unit between the high refractive index layer and the low refractive index layer occurs quickly, the setting step may not be provided.
- the set time is adjusted by adjusting the concentration of the water-soluble binder resin and the metal oxide particles, and adding other components such as various known gelling agents such as gelatin, pectin, agar, carrageenan and gellan gum. Can be adjusted.
- the temperature of the cold air is preferably 0 to 25 ° C, more preferably 5 to 10 ° C. Further, the time during which the coating film is exposed to the cold air is preferably 10 to 120 seconds, although it depends on the transport speed of the coating film.
- FIG. 2 is an example of the near-infrared shielding film of the present invention having a near-infrared reflective layer of a multilayer film, and shows a configuration including a reflective layer unit having a near-infrared reflective layer group on one surface side of a transparent substrate. It is a schematic sectional drawing.
- the near-infrared shielding film 10 of the present invention has a reflective layer unit U.
- the reflective layer unit U includes, as an example, a high refractive index reflective layer containing a first water-soluble binder resin and first metal oxide particles on one surface of the transparent substrate 11, and a second water-soluble layer.
- the reflective layer group ML is formed by alternately laminating a binder resin and a low refractive index reflective layer containing second metal oxide particles.
- the reflective layer group ML is composed of n layers of reflective layers T 1 to T n , for example, T 1 , T 3 , T 5 , (omitted), T n ⁇ 2 , T n with a refractive index of 1.10 to It is composed of a low refractive index layer in the range of 1.60, and T 2 , T 4 , T 6 , (omitted), and T n-1 are high in the refractive index range of 1.80 to 2.50.
- An example of the configuration is a refractive index layer.
- the refractive index as used in the field of this invention is the value measured in the environment of 25 degreeC.
- the hard coat layer for improving the scratch resistance is provided on the surface of the transparent substrate 11 on which the reflective layer unit is not provided via the adhesive layer 12 having the near infrared shielding effect and the transparent substrate 11 according to the present invention. 14 is preferably provided.
- the hard coat layer used in the present invention preferably has a pencil hardness in the range of H to 8H, particularly preferably in the range of 2H to 6H.
- the pencil hardness is measured by adjusting the near infrared shielding film having the hard coat layer on the outermost surface for 2 hours under conditions of a temperature of 25 ° C. and a relative humidity of 60%, and then using a test pencil specified by JIS S 6006. It is the value measured according to the pencil hardness evaluation method prescribed
- the order of lamination of the hard coat layer is not particularly limited, but the hard coat layer is disposed on at least one outermost layer of the near infrared shielding film from the viewpoint of imparting scratch resistance. It is preferable.
- Examples of materials used for the hard coat layer include organic hard coat materials such as silicone, melamine, epoxy, acrylate, and polyfunctional (meth) acrylic compounds; inorganic hard coat materials such as silicon dioxide; Etc. Among these, from the viewpoint of good adhesion and excellent productivity, it is preferable to use a hard coat forming material of a (meth) acrylate-based or polyfunctional (meth) acrylic-based compound.
- (meth) acryl means acryl and methacryl.
- the hard coat layer is preferably a layer formed of a resin composition containing a resin that cures through a crosslinking reaction as a main component.
- a mold resin is preferred.
- an ultraviolet curable resin is preferably used as the active energy ray curable resin.
- the ultraviolet curable resin is not particularly limited.
- ADEKA OPTMER KR, BY series KR-400, KR-410, KR-550, KR-566, KR-567, BY-320B (above, Asahi Denka) Manufactured by Kogyo Co., Ltd.
- inorganic or organic fine particles can be added to the coating composition of the hard coat layer in order to prevent adhesion with other substances and improve the scratch resistance and the like.
- the volume average particle diameter of the fine particle powder is in the range of 0.01 to 10 ⁇ m, and the amount used is in the range of 0.1 to 20 parts by mass with respect to 100 parts by mass of the active energy ray-curable resin. It is desirable to blend in.
- an antioxidant that does not inhibit the photocuring reaction can be selected and used.
- examples include hindered phenol derivatives, thiopropionic acid derivatives, phosphite derivatives, and the like.
- 4,4′-thiobis (6-tert-3-methylphenol), 4,4′-butylidenebis (6-tert-butyl-3-methylphenol), 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) mesitylene, di-octadecyl-4-
- examples include hydroxy-3,5-di-tert-butylbenzyl phosphate.
- the hard coat layer forming liquid may contain a solvent, or may be appropriately contained and diluted as necessary.
- the organic solvent contained in the forming liquid include hydrocarbons (toluene, xylene), alcohols (methanol, ethanol, isopropanol, butanol, cyclohexanol), ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone), It can be appropriately selected from esters (methyl acetate, ethyl acetate, methyl lactate), glycol ethers, and other organic solvents, or a mixture thereof can be used.
- Propylene glycol monoalkyl ether (1 to 4 carbon atoms in the alkyl group) or propylene glycol monoalkyl ether acetate ester (1 to 4 carbon atoms in the alkyl group) is 5% by mass or more, more preferably 5 to 80%. It is preferable to use the organic solvent contained within a mass% range.
- the hard coat layer has a center surface average surface roughness Ra specified by JIS B 0601, preferably less than 0.05 ⁇ m, more preferably in the range of 0.002 to 0.04 ⁇ m, and has a good smooth surface. It is preferable at the point which can form a hard-coat layer.
- the center line average roughness (Ra) can be measured with an optical interference type surface roughness measuring instrument, and can be measured using, for example, a non-contact surface fine shape measuring device WYKO NT-2000 manufactured by WYKO.
- the hard coat layer is formed by, for example, applying a hard coat layer forming solution in which an active energy ray curable resin and an active energy ray curable resin composition mixed with other additives and additives are dissolved in an organic solvent. Thereafter, it can be formed by irradiating active rays during or after drying.
- the method for applying the hard coat layer forming liquid is not particularly limited, and for example, it can be applied by a known method such as a gravure coater, a dip coater, a reverse coater, a wire bar coater, a die coater, or an ink jet method. It is preferable to apply a wet film thickness within the range of 0.1 to 100 ⁇ m on one surface of the substrate using the above-described coating method.
- the forming liquid for coating the hard coat layer preferably has a solid concentration in the range of 10 to 95% by mass, and an appropriate concentration is selected depending on the coating method.
- any light source that generates ultraviolet rays can be used.
- a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, or the like can be used.
- commercially available products such as H lamp, D lamp, and V lamp manufactured by Fusion System can be used.
- Irradiation conditions vary depending on each lamp, but the amount of irradiation light may be in the range of 20 to 1200 mJ / cm 2 , and preferably in the range of 50 to 1000 mJ / cm 2 . From the near ultraviolet region to the visible light region, it can be used by using a sensitizer having an absorption maximum in that region.
- the dry film thickness of the hard coat layer is in the range of an average film thickness of 0.1 to 30 ⁇ m, preferably in the range of 1 to 20 ⁇ m. From the viewpoint of flexibility or economy, it is particularly preferably 15 ⁇ m or less.
- the docoat layer may be a single layer or a multilayer structure of two or more layers.
- Release layer (separator or release sheet) Before the near-infrared shielding film of the present invention is used as, for example, a window film, it is preferable to provide a release sheet (also referred to as a separator) on the surface of the adhesive layer.
- a release sheet also referred to as a separator
- the release sheet only needs to be able to protect the tackiness of the pressure-sensitive adhesive.
- the thickness of the release sheet is not particularly limited, but it is usually preferably in the range of 12 to 250 ⁇ m.
- Example 1 [Preparation of near-infrared shielding film 101]
- the near-infrared shielding film shown in FIG. 1 was produced by the following procedure.
- UV-3701 manufactured by Toagosei Co., Ltd.
- coating with a gravure coater, drying at a drying temperature of 90 ° C., and then curing the coating layer with an integrated light quantity of 300 mJ / cm 2 using a high-pressure mercury lamp.
- a hard coat layer was formed to be 2 ⁇ m.
- the resin A according to the present invention will be described as a hydroxy group type, the resin B as a carboxy group type, and the resin C as a hydroxy group / carboxy group type.
- the pressure-sensitive adhesive layer-forming coating solution 1 prepared above was applied to the release-treated surface of the separator (NS-23MA: manufactured by Nakamoto Pax Co., Ltd.) and dried at 80 ° C. for 1 minute.
- the opposite surface of the PET film on which the hard coat layer was formed and the adhesive layer surface were bonded together to produce a near infrared ship shielding film 101.
- the thickness of the adhesive layer was 10 ⁇ m.
- the near-infrared shielding film having a hard coat layer on one surface of the transparent substrate and an adhesive layer and a separate film containing Cs 0.33 WO 3 and an acrylic adhesive resin on the other surface 101 was produced.
- a hydroxy group type acrylic adhesive resin is selected from EA / 2EHA / ethyl acrylate (EA), ethylhexyl acrylate (EHA), 2-hydroxyethyl acrylate (HEA), and acrylic acid (AA).
- the near-infrared shielding film 103 was produced in the same manner as in the near-infrared shielding film 101 except that a hydroxy value of 55 mgKOH / g) was used.
- a near-infrared shielding film 105 was produced in the same manner as in the near-infrared shielding film 102 except that a polymer (weight average molecular weight: 750,000, acid value 2 mgKOH / g) was used.
- the same operation as that of the near-infrared shielding film 101 was performed except that an acrylic ester copolymer (weight average molecular weight: 650,000, acid value of 1 mgKOH / g, hydroxy value of 9 mgKOH / g) was used.
- 106 was produced.
- the same operation as that of the near-infrared shielding film 101 was performed except that an acrylic ester copolymer (weight average molecular weight: 630,000, acid value of less than 0.5 mgKOH / g, hydroxy value of 75 mgKOH / g) was used.
- An infrared shielding film 108 was produced.
- a near-infrared shielding film 109 was produced in the same manner as in the near-infrared shielding film 101 except that a polymer (weight average molecular weight: 550,000, acid value less than 1 mgKOH / g) was used.
- the same operation as that of the near-infrared shielding film 101 was performed except that the acrylic acid ester copolymer (weight average molecular weight: 700,000, acid value of 8 mgKOH / g, hydroxy value of 10 mgKOH / g) was obtained.
- An infrared shielding film 112 was produced.
- Acrylic ester copolymer (weight average molecular weight: 650,000, acid value of less than 0.5 mgKOH / g, hydroxy value of 16 mgKOH / g) was used, and an acrylic adhesive resin of hydroxy group / carboxy group type was used as EA / 2EHA.
- a near-infrared shielding film 113 was produced in the same manner as in the near-infrared shielding film 101 except that a hydroxy value of 10 mgKOH / g) was used.
- a near-infrared shielding film 114 was produced in the same manner as in the near-infrared shielding film 101 except that a valence of 10 mgKOH / g) was used.
- Acrylic ester copolymer (weight average molecular weight: 700,000, acid value of less than 0.5 mgKOH / g, hydroxy value of 16 mgKOH / g) was used, and an acrylic adhesive resin of hydroxy group / carboxy group type was used as EA / 2EHA.
- a near-infrared shielding film 115 was produced in the same manner as in the near-infrared shielding film 101 except that a hydroxy value of 5 mgKOH / g) was used.
- Acrylic ester copolymer (weight average molecular weight: 700,000, acid value of less than 0.5 mgKOH / g, hydroxy value of 16 mgKOH / g) was used, and an acrylic adhesive resin of hydroxy group / carboxy group type was used as EA / 2EHA.
- the resulting acrylic acid ester copolymer (weight average molecular weight: 700,000, acid value of 8 mgKOH / g, hydroxy value of 10 mgKOH / g) was mixed at 50/25/25 (solid-solid ratio).
- YMF-02A manufactured by Sumitomo Metal Mining Co., Ltd .: CWO dispersion, solid content 28.5%
- a near-infrared shielding film 117 was produced in the same manner as in the near-infrared shielding film 101 except that the forming coating solution was used.
- / AA Acrylic ester copolymer obtained by copolymerization at a mass ratio of 37.07 / 60 / 1.65 / 1.28 (weight average molecular weight: 700,000, acid value of 8 mgKOH / g, hydroxy value) Except for using 10 mg KOH / g), the same operation as that of the near-infrared shielding film 101 was performed to produce a near-infrared shielding film 119.
- Acrylic ester copolymer (weight average molecular weight: 630,000, acid value of less than 0.5 mgKOH / g, hydroxy value of 75 mgKOH / g) was used, and an acrylic adhesive resin of hydroxy group / carboxy group type was used as EA / 2EHA.
- a near-infrared shielding film 120 was produced by performing the same operation as that of the near-infrared shielding film 101 except that a hydroxy value of 10 mgKOH / g) was used.
- Acrylic ester copolymer (weight average molecular weight: 650,000, acid value of less than 0.5 mgKOH / g, hydroxy value of 16 mgKOH / g) was used, and an acrylic adhesive resin of hydroxy group / carboxy group type was used as EA / 2EHA.
- a near-infrared shielding film 121 was prepared by performing the same operation as that of the near-infrared shielding film 101 except that a hydroxy value of 0.7 mgKOH / g) was used.
- Acrylic ester copolymer (weight average molecular weight: 650,000, acid value of less than 0.5 mgKOH / g, hydroxy value of 16 mgKOH / g) was used, and an acrylic adhesive resin of hydroxy group / carboxy group type was used as EA / 2EHA.
- a near-infrared shielding film 122 was produced by performing the same operation as that of the near-infrared shielding film 101 except that a hydroxy value of 75 mgKOH / g) was used.
- Acrylic adhesive resin / UV absorber / curing agent 100/5 / 0.16 (solid-solid ratio)
- the near-infrared shielding film 123 to which CWO has not been added was prepared in the same manner as in the near-infrared shielding film 101 except that the coating solution for forming the adhesive layer was used.
- the acid value and hydroxy value of the acrylic adhesive resin used were measured based on the methods defined in JIS K1557-1: 2007, respectively.
- Example 2 The following near-infrared shielding films were produced in the same manner as in Example 1.
- Acrylic ester copolymer (weight average molecular weight: 700,000, acid value of 8 mgKOH / g, hydroxy value of 10 mgKOH / g) was added and stirred.
- a near-infrared shielding film having the configuration shown in FIG. 2 was produced by the following procedure.
- the obtained colloidal silica dispersion L1 was heated to 45 ° C., and 4.0% by mass of polyvinyl alcohol (B) as a polyvinyl alcohol (manufactured by Nippon Vinyl Bipo-Poval Co., Ltd., JP-45: polymerization) 4500, saponification degree 86.5 to 89.5 mol%) and 760 parts of an aqueous solution were sequentially added with stirring. Thereafter, 40 parts of a 1% by weight betaine surfactant (manufactured by Kawaken Fine Chemical Co., Ltd., Sofazoline (registered trademark) LSB-R) aqueous solution was added to prepare a coating solution L1 for a low refractive index layer.
- B polyvinyl alcohol
- betaine surfactant manufactured by Kawaken Fine Chemical Co., Ltd., Sofazoline (registered trademark) LSB-R
- the raw material titanium oxide hydrate is obtained by thermal hydrolysis of an aqueous titanium sulfate solution according to a known method.
- the base-treated titanium compound was suspended in pure water so that the concentration when converted to TiO 2 was 20 g / L. Therein, it was added with TiO 2 amount to stirring 0.4 mole% citric acid. After that, when the temperature of the mixed sol solution reaches 95 ° C., concentrated hydrochloric acid is added so that the hydrochloric acid concentration becomes 30 g / L. The mixture is stirred for 3 hours while maintaining the liquid temperature at 95 ° C. A liquid was prepared.
- the pH and zeta potential of the obtained titanium oxide sol solution were measured, the pH was 1.4 and the zeta potential was +40 mV. Moreover, when the particle size was measured with a Zetasizer Nano manufactured by Malvern, the monodispersity was 16%.
- titanium oxide sol solution was dried at 105 ° C. for 3 hours to obtain titanium oxide powder fine particles.
- the powder fine particles were subjected to X-ray diffraction measurement using JDX-3530 type manufactured by JEOL Datum Co., Ltd. and confirmed to be rutile titanium oxide fine particles.
- the volume average particle diameter of the fine particles was 10 nm.
- a 20.0 mass% titanium oxide sol aqueous dispersion containing rutile-type titanium oxide fine particles having a volume average particle diameter of 10 nm was added to 4 kg of pure water to obtain a sol solution serving as core particles.
- Preparation of coating liquid H1 for high refractive index layer 28.9 parts of a sol solution containing core / shell particles as the first metal oxide particles having a solid content concentration of 20.0% by mass obtained above, and 10.5 parts of a 1.92% by mass citric acid aqueous solution. And 2.0 parts of an aqueous solution of 10% by weight polyvinyl alcohol (manufactured by Kuraray Co., Ltd., PVA-103: polymerization degree 300, saponification degree 98.5 mol%) and 9.0 parts of a 3% by weight aqueous boric acid solution. By mixing, a core-shell particle dispersion H1 was prepared.
- UV-3701 manufactured by Toagosei Co., Ltd.
- coating with a gravure coater, drying at a drying temperature of 90 ° C., and then curing the coating layer with an integrated light quantity of 300 mJ / cm 2 using a high-pressure mercury lamp.
- a hard coat layer was formed to be 2 ⁇ m.
- the adhesive layer forming coating solution 1 prepared at the time of producing the near-infrared shielding film 101 was applied to the opposite surface of the PET film on which the hard coat layer was formed, and dried at 80 ° C. for 1 minute.
- the opposite surface of the PET film on which the infrared reflective layer was formed and the adhesive layer surface were bonded together.
- the prepared coating solution 2 for forming an adhesive layer was applied to the release-treated surface of a separator (NS-23MA: manufactured by Nakamoto Pax Corporation), dried at 80 ° C. for 1 minute, The reflective layer surface and the adhesive layer surface were bonded together to produce a near-infrared shielding film 129.
- the thickness of the adhesive layer was 10 ⁇ m.
- YMF-02A Suditomo Metal Mining Co., Ltd .: CWO dispersion solid content 28.5%
- EA / 2EHA / HEA / AA 37.85 / 60 / 0.1 /
- Tinuvin 477 solid content 80%
- a near-infrared shielding film 131 was produced in the same manner as in the near-infrared shielding film 129 except that the coating solution for forming the adhesive layer was used by mixing at 5 / 0.16 (solid-solid ratio).
- Example 2 Using the produced near-infrared reflective films 124 to 134 and the near-infrared reflective films 101, 110 and 118 produced in Example 1, in addition to the evaluation in Example 1, the haze after the following weather resistance test was added. The results are shown in Table 2. (5) Haze after weather resistance test The sample was exposed for 1000 hours under an environment of 85 ° C. and 85% RH, and then the haze was measured under the above conditions. Those having a haze value of 1.2% or less are excellent.
- the near-infrared shielding film of the present invention reproduced Example 1 and was found to have excellent haze in the initial stage, after the light resistance test, after the weather resistance test, and small discoloration.
- a carboxy group type resin B or a hydroxy group / carboxy group type resin C is added. Since the haze is excellent even in a severer weather resistance test (exposure for 1000 hours in an environment of 85 ° C. and 85% RH), it was found that the method to be used is a preferable production method.
- the near-infrared shielding film of the present invention has a low initial haze and can suppress an increase in haze in a weather resistance test, display device parts such as an image display device and a touch panel, and buildings, automobiles, train window glass, etc. Suitable as protective film and heat shield film.
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Abstract
Description
樹脂B:酸価が1~60mgKOH/gの範囲内である樹脂
樹脂C:酸価が1mgKOH/g以上であり、かつヒドロキシ価が5~60mgKOH/gの範囲内である樹脂
酸化物微粒子D:タングステン酸化物微粒子又は複合タングステン酸化物微粒子
2.前記構成層が、粘着層であることを特徴とする第1項に記載の近赤外線遮蔽フィルム。
樹脂B:酸価が1~60mgKOH/gの範囲内である樹脂
樹脂C:酸価が1mgKOH/g以上であり、かつヒドロキシ価が5~60mgKOH/gの範囲内の樹脂
酸化物微粒子D:タングステン酸化物微粒子又は複合タングステン酸化物微粒子
本発明の近赤外線遮蔽フィルムは、透明基材の少なくとも一方の面上に、化合物として、下記樹脂Aと、下記樹脂B又は樹脂Cの少なくとも一方と、下記酸化物微粒子Dとを含有する構成層を有することを特徴とする。
樹脂B:酸価が1~60mgKOH/gの範囲内である樹脂
樹脂C:酸価が1mgKOH/g以上であり、かつヒドロキシ価が5~60mgKOH/gの範囲内である樹脂
酸化物微粒子D:タングステン酸化物微粒子又は複合タングステン酸化物微粒子
ここで、樹脂の酸価とは、カルボキシ基を含有する樹脂1gに含まれる全酸性成分(例えば、カルボキシ基、スルホ基等)の量を表すものであり、全酸性成分を中和するのに要する水酸化カリウムのmg数で表される。酸価の測定方法は滴定、例えば、JIS K1557-1:2007などで定められている方法を用いることができる。
図によって本発明の近赤外線遮蔽フィルムの構成を示す。
本発明の近赤外線遮蔽フィルムに適用可能な透明基材としては、透明樹脂フィルムである。本発明でいう「透明」とは、JIS S3107(2013)に準拠する方法で測定される可視光透過率としては、50%以上であることをいい、好ましくは60%以上、より好ましくは70%以上、特に好ましくは80%以上である。
本発明の近赤外線遮蔽フィルムは、樹脂A:酸価が0.5mgKOH/g未満であり、かつヒドロキシ価が5~60mgKOH/gの範囲内であるヒドロキシ基を主な架橋基として有する樹脂と、少なくとも樹脂B:酸価が1~60mgKOH/gの範囲内であるカルボキシ基を主な架橋基として有する樹脂、又は樹脂C:酸価が1mgKOH/g以上であり、かつヒドロキシ価が5~60mgKOH/gの範囲内であるヒドロキシ基とカルボキシ基の両方を有し主な架橋基として有する樹脂との少なくとも2種類以上の樹脂を併用して、構成層のバインダーとして用いることが特徴である。
ヒドロキシ基を主な架橋基として有するアクリル系樹脂(以下、ヒドロキシ基タイプのアクリル系樹脂ともいう。)は、酸価が0.5mgKOH/g未満であり、かつヒドロキシ価が5~60mgKOH/gの範囲内であるヒドロキシ基を主な架橋基として有する樹脂であり、アクリル酸エステル骨格を備えかつヒドロキシ基を主な架橋基に有している化合物であることが好ましい。具体的には、アクリル酸アルキルエステル又はメタクリル酸アルキルエステル(a-1)が挙げられ、この(a-1)と共重合可能なヒドロキシ基を有するモノマー(a-2)を重合して成るポリマーでもよく、上記(a-1)又は(a-2)と共重合可能なその他のモノマー(a-3)を、本発明の効果を阻害しない範囲で含有していてもよい。
上記アクリル酸アルキルエステルとしては、アクリル酸のC1~15の直鎖、分岐鎖又は環状アルキルエステルが挙げられる。例えば、アクリル酸メチル、アクリル酸エチル、アクリル酸n-プロピル、アクリル酸-t-ブチル、アクリル酸イソプロピル、アクリル酸n-ブチル、アクリル酸-sec-ブチル、アクリル酸-t-ブチル、アクリル酸-n-ペンチル、アクリル酸イソアミル、アクリル酸-n-ヘキシル、アクリル酸-n-ヘプチル、アクリル酸-n-オクチル、アクリル酸-2-エチルヘキシル、アクリル酸ノニル、アクリル酸デシル、アクリル酸ドデシル、アクリル酸イソボニル、アクリル酸シクロヘキシル等が挙げられる。
上記(a-1)と共重合可能なヒドロキシ基を有するモノマーとしては、アクリル酸-2-ヒドロキシエチル、メタクリル酸-2-ヒドロキシエチル、アクリル酸-2-ヒドロキシプロピル、メタクリル酸-2-ヒドロキシプロピル、アクリル酸-3-ヒドロキシブチル、メタクリル酸-3-ヒドロキシブチル、アクリル酸-2-ヒドロキシ-3-クロロプロピル、メタクリル酸-2-ヒドロキシ-3-クロロプロピル、アクリル酸-2-ヒドロキシ-3-フェノキシプロピル、メタクリル酸-2-ヒドロキシ-3-フェノキシプロピル等のヒドロキシ基含有モノマーが例示される。
上記(a-1)又は(a-2)と共重合可能なその他のモノマーとしては、アクリル系樹脂として、酸価が0.5mgKOH/g未満であり、かつヒドロキシ価が5~60mgKOH/gの範囲内に調整可能であって、粘着性を向上させるため少量の付加が行われることもあり、例えば、1以上のカルボキシ基を分子内に有する不飽和結合を有する化合物が挙げられる。例えば、アクリル酸、メタクリル酸、アクリル-β-カルボキシエチル、メタクリル酸-β-カルボキシエチル、アクリル酸-5-カルボキシペンチル、メタクリル酸-5-カルボキシペンチル、コハク酸モノアクリロイルオキシエチルエステル、ω-カルボキシポリカプロラクトンモノアクリレート、ω-カルボキシポリカプロラクトンモノメタクリレート、イタコン酸、クロトン酸、フマル酸、マレイン酸等のカルボキシ基含有モノマーが挙げられる。
本発明に係るカルボキシ基を主な架橋基として有するアクリル系樹脂(以下、カルボキシ基タイプのアクリル系樹脂ともいう。)は、該樹脂の酸価が1~60mgKOH/gのアクリル系樹脂であり、好ましくは5~30mgKOH/g、より好ましくは5~20mgKOH/g、さらに好ましくは5~10mgKOH/gである。該樹脂の酸価を1mgKOH/g以上とすることにより、該樹脂に対するタングステン酸化物粒子又は複合タングステン酸化物微粒子の分散性が良好となり、ヘイズの上昇を抑制することができる。また、該樹脂の酸価を60mgKOH/g以下とすることにより、リワーク性のある再剥離性が向上する。特に、該樹脂の酸価を5~10mgKOH/gとすることにより、該樹脂に対するタングステン酸化物粒子又は複合タングステン酸化物微粒子の分散性が高まり、近赤外線吸収性能が向上するため好ましい。
本発明に係る(c)一分子中にヒドロキシ基とカルボキシ基を両方有するタイプのアクリル系樹脂(以下、ヒドロキシ基/カルボキシ基タイプのアクリル系樹脂ともいう。)は、酸価が1mgKOH/g以上であり、かつヒドロキシ価が5~60mgKOH/gの範囲内である樹脂である。
本発明に係る樹脂A、樹脂B及び樹脂Cは、硬化剤と混合してバインダーとすることが好ましい。
本発明の近赤外線遮蔽フィルムは、酸化物微粒子D:タングステン酸化物微粒子又は複合タングステン酸化物微粒子を赤外線吸収剤として用いることによって、近赤外線遮蔽効果を発現する。
当該タングステン酸化物微粒子と複合タングステン酸化物微粒子は、一般式WyOz(但し、Wはタングステン、Oは酸素、2.2≦z/y<3.0)で表記されるタングステン酸化物微粒子、又は一般式MxWyOz(但し、Mは、H、He、アルカリ金属、アルカリ土類金属、希土類元素、Mg、Zr、Cr、Mn、Fe、Ru、Co、Rh、Ir、Ni、Pd、Pt、Cu、Ag、Au、Zn、Cd、Al、Ga、In、Tl、Si、Ge、Sn、Pb、Sb、B、F、P、S、Se、Br、Te、Ti、Nb、V、Mo、Ta、Re、Be、Hf、Os、Bi、Iの内から選択される1種類以上の元素、Wはタングステン、Oは酸素、0.001≦x/y≦1.0、2.2≦z/y≦3.0)で表記される複合タングステン酸化物微粒子により構成される。
本発明の近赤外線遮蔽フィルムは、本発明に係る前記(a)と、前記(b)又は(c)の少なくとも一方と、前記(d)とを含有する構成層が、近赤外線遮蔽機能を有する粘着層であることが好ましい。
(1)タングステン酸化物微粒子又は複合タングステン酸化物微粒子分散液の調製
本発明に係るタングステン酸化物微粒子又は複合タングステン酸化物微粒子分散液は、例えば、必須成分のタングステン酸化物微粒子又は複合タングステン酸化物微粒子を、必要に応じて分散剤と共に、適量の溶剤中に混合し、必要に応じて適切に分散処理することにより得られる。
(2)樹脂ワニスの調製
上記タングステン酸化物微粒子又は複合タングステン酸化物微粒子分散液とは別に、本発明に係る樹脂を適量の溶剤に混合し、ワニスとする。
(3)粘着層組成物の調製
上記タングステン酸化物微粒子又は複合タングステン酸化物微粒子分散液及び上記樹脂含有ワニスを混合、十分に撹拌することで目的の粘着層組成物が得られる。
溶剤は前記粘着層用塗布液を均一に混合、分散し、当該塗布液に塗工性を付与するものである。
本発明に係る近赤外線遮蔽性を有する粘着層用塗布液には、上記本発明の効果が損なわれない限り、更に、金属不活性化剤、可塑剤、酸化防止剤、充填剤、シランカップリング剤等を1種以上含有させても良い。
分散剤は、分散対象である微粒子に吸着し、凝集している微粒子を溶剤などで濡れやすくすることで、微粒子の一次粒子化の促進、凝集防止、粘度低下、流動性改善、沈降防止等の機能を有する。本発明において、微粒子である複合タングステン酸化物微粒子を粘着性樹脂に分散する場合には適宜、公知の樹脂型分散剤、無機分散剤を用いることができる。
界面活性剤は、上記分散剤の機能を補助する役割を果たす。
粘着層を形成するための塗工方法としては、任意の公知の方法が使用でき、例えば、上記調製した粘着層用塗布液を。ダイコーター法、グラビアロールコーター法、ブレードコーター法、スプレーコーター法、エアーナイフコート法、ディップコート法、転写法等が好ましく挙げられ、単独又は組合せて用いることができる。
本発明の近赤外線遮熱フィルムは、透明基材上に、さらなる機能の付加を目的として、近赤外線反射層、易接着層、導電性層、帯電防止層、ガスバリアー層、防汚層、消臭層、流滴層、易滑層、ハードコート層、耐摩耗性層、電磁波シールド層、紫外線吸収層、印刷層、蛍光発光層、ホログラム層、離形層等を設けてもよい。
本発明の近赤外線遮蔽フィルムは、前記構成層(粘着層)を設けた前記透明基材の少なくとも一方の面上に、800~1300nmの波長の光を20%以上反射する近赤外線反射層を有することが好ましい。
〔高屈折率層〕
高屈折率層は、第1の水溶性バインダー樹脂及び第1の金属酸化物粒子を含有し、必要に応じて、硬化剤、その他のバインダー樹脂、界面活性剤、及び各種添加剤等を含んでもよい。
本発明に係る第1の水溶性バインダー樹脂は、該水溶性バインダー樹脂が最も溶解する温度で、0.5質量%の濃度に水に溶解させた際、G2グラスフィルタ(最大細孔40~50μm)で濾過した場合に濾別される不溶物の質量が、加えた該水溶性バインダー樹脂の50質量%以内であるものをいう。
本発明において、高屈折率層と低屈折率層とは、ケン化度の異なる2種以上のポリビニルアルコールを含むことが好ましい。ここで、区別するために、高屈折率層で用いる水溶性バインダー樹脂としてのポリビニルアルコールをポリビニルアルコール(A)とし、低屈折率層で用いる水溶性バインダー樹脂としてのポリビニルアルコールをポリビニルアルコール(B)という。なお、各屈折率層が、ケン化度や重合度が異なる複数のポリビニルアルコールを含む場合には、各屈折率層中で最も含有量の高いポリビニルアルコールをそれぞれ高屈折率層におけるポリビニルアルコール(A)、及び低屈折率層におけるポリビニルアルコール(B)と称する。
P=(〔η〕×103/8.29)(1/0.62)
低屈折率層に含まれるポリビニルアルコール(B)は、ケン化度が75~90mol%の範囲内で、かつ重合度が2000~5000の範囲内であることが好ましい。このような特性を備えたポリビニルアルコールを低屈折率層に含有させると、界面混合がより抑制される点で好ましい。これは塗膜のひび割れが少なく、かつセット性が向上するためであると考えられる。
本発明において、高屈折率層では、ポリビニルアルコール以外の第1の水溶性バインダー樹脂としては、第1の金属酸化物粒子を含有した高屈折率層が塗膜を形成することができれば、いかなるものでも制限なく使用可能である。また、後述する低屈折率層においても、ポリビニルアルコール(B)以外の第2の水溶性バインダー樹脂としては、前記と同様に、第2の金属酸化物粒子を含有した低屈折率層が塗膜を形成することができれば、どのようなものでも制限なく使用可能である。ただし、環境の問題や塗膜の柔軟性を考慮すると、水溶性高分子(特にゼラチン、増粘多糖類、反応性官能基を有するポリマー)が好ましい。これらの水溶性高分子は単独で用いても構わないし、2種類以上を混合して用いても構わない。
本発明において、高屈折率層に適用可能な第1の金属酸化物粒子としては、屈折率が2.0以上、3.0以下である金属酸化物粒子が好ましい。さらに具体的には、例えば、酸化チタン、酸化ジルコニウム、酸化亜鉛、アルミナ、コロイダルアルミナ、チタン酸鉛、鉛丹、黄鉛、亜鉛黄、酸化クロム、酸化第二鉄、鉄黒、酸化銅、酸化マグネシウム、水酸化マグネシウム、チタン酸ストロンチウム、酸化イットリウム、酸化ニオブ、酸化ユーロピウム、酸化ランタン、ジルコン、酸化スズなどが挙げられる。また複数の金属で構成された複合酸化物粒子やコア・シェル状に金属構成が変化するコア・シェル粒子等を用いることもできる。
本発明においては、高屈折率層に適用する第1の水溶性バインダー樹脂を硬化させるため、硬化剤を使用することもできる。例えば、第1の水溶性バインダー樹脂として、ポリビニルアルコールを用いる場合では、硬化剤として、ホウ酸及びその塩が好ましい。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)、アルミニウム明ばん等が挙げられる。
本発明に係る低屈折率層は、第2の水溶性バインダー樹脂及び第2の金属酸化物粒子を含み、更は、硬化剤、表面被覆成分、粒子表面保護剤、バインダー樹脂、界面活性剤、各種添加剤等を含んでもよい。
本発明に係る低屈折率層に適用する第2の水溶性バインダー樹脂として、ポリビニルアルコールが好ましく用いられる。さらに、前記高屈折率層に存在するポリビニルアルコール(A)のケン化度とは異なるポリビニルアルコール(B)が、本発明に係る低屈折率層に用いられることがより好ましい。なお、ここでの第2の水溶性バインダー樹脂の好ましい重量平均分子量等、ポリビニルアルコール(A)及びポリビニルアルコール(B)についての説明は、上記高屈折率層の水溶性バインダー樹脂にて説明されており、ここでは説明を省略する。
本発明に係る低屈折率層に適用する第2の金属酸化物粒子としては、シリカ(二酸化ケイ素)を用いることが好ましく、具体的な例として合成非晶質シリカ、コロイダルシリカ等が挙げられる。これらのうち、酸性のコロイダルシリカゾルを用いることがより好ましい。
本発明に係る低屈折率層において、前記高屈折率層と同様に、硬化剤をさらに含むことができる。低屈折率層に含まれる第2の水溶性バインダー樹脂と硬化反応を起こすものであれば、特に制限されない。特に、低屈折率層に適用する第2の水溶性バインダー樹脂としてポリビニルアルコールを用いた場合の硬化剤としては、ホウ酸及びその塩及び/又はホウ砂が好ましい。また、ホウ酸及びその塩以外にも公知のものが使用できる。
本発明に係る高屈折率層及び低屈折率層には、必要に応じて各種の添加剤を用いることができる。また、高屈折率層における添加剤の含有量は、高屈折率層の固形分100質量%に対して、0~20質量%であることが好ましい。当該添加剤として例えば、特開2012-139948号公報段落〔0140〕~〔0154〕に記載の界面活性剤、アミノ酸、エマルジョン樹脂、リチウム化合物、及び同公報段落〔0155〕記載のその他の添加剤を挙げることができる。
本発明に用いられる近赤外線反射層の形成方法は、湿式塗布方式を適用して形成することが好ましく、更には、透明基材上に、第1の水溶性バインダー樹脂及び第1の金属酸化物粒子を含む高屈折率層用塗布液と、第2の水溶性バインダー樹脂及び第2の金属酸化物粒子を含む低屈折率層用塗布液と、を湿式塗布する工程を含む製造方法が好ましい。
高屈折率層用塗布液及び低屈折率層用塗布液を調製するために適用可能な溶媒は、特に制限されないが、水、有機溶媒、又はその混合溶媒が好ましい。
高屈折率層用塗布液中の水溶性バインダー樹脂の濃度は、1~10質量%の範囲内であることが好ましい。また、高屈折率層用塗布液中の金属酸化物粒子の濃度は、1~50質量%の範囲内であることが好ましい。
高屈折率層用塗布液及び低屈折率層用塗布液の調製方法は、特に制限されず、例えば、水溶性バインダー樹脂、金属酸化物粒子、及び必要に応じて添加されるその他の添加剤を添加し、撹拌混合する方法が挙げられる。この際、水溶性バインダー樹脂、金属酸化物粒子、及び必要に応じて用いられるその他の添加剤の添加順も特に制限されず、撹拌しながら各成分を順次添加し混合してもよいし、撹拌しながら一度に添加し混合してもよい。必要に応じて、さらに溶媒を用いて、適当な粘度に調製される。
スライドホッパー塗布法により同時重層塗布を行う際の低屈折率層用塗布液の36℃における粘度は、被膜の均一性を向上するためには、100~300mPa・sの範囲内が好ましく、180~250mPa・sの範囲内がより好ましい。同様に高屈折率層用塗布液の36℃の粘度は、10~50mPa・sの範囲内が好ましく、15~35mPa・sの範囲内がより好ましい。
塗布及び乾燥方法は、特に制限されないが、高屈折率層用塗布液及び低屈折率層用塗布液を30℃以上に加温して、基材上に高屈折率層用塗布液及び低屈折率層用塗布液の同時重層塗布を行った後、形成した塗膜の温度を好ましくは1~15℃に一旦冷却し(セット)、その後10℃以上で乾燥することが好ましい。より好ましい乾燥条件は、湿球温度5~50℃、膜面温度10~50℃の範囲の条件である。また、塗布直後の冷却方式としては、形成された塗膜の均一性向上の観点から、水平セット方式で行うことが好ましい。
反射層ユニットUは、透明基材11の一方の面に、一例として、第1の水溶性バインダー樹脂と第1の金属酸化物粒子を含有する高屈折率の反射層と、第2の水溶性バインダー樹脂と第2の金属酸化物粒子を含有する低屈折率の反射層とを交互に積層した反射層群MLを有している。反射層群MLは、反射層T1~Tnのn層で構成され、例えば、T1、T3、T5、(中略)、Tn-2、Tnを屈折率が1.10~1.60の範囲内にある低屈折率層で構成し、T2、T4、T6、(中略)、Tn-1を屈折率が1.80~2.50の範囲内にある高屈折率層とする構成が一例として挙げられる。本発明でいう屈折率とは、25℃の環境下で測定した値である。
本発明に用いられるハードコート層は、鉛筆硬度がH~8Hの範囲内であることが好ましく、特に好ましくは2H~6Hの範囲内である。鉛筆硬度は、ハードコート層を最表面に配置した近赤外線遮蔽フィルムを、温度25℃、相対湿度60%の条件で2時間調湿した後、JIS S 6006が規定する試験用鉛筆を用いて、JIS K 5400が規定する鉛筆硬度評価方法に従い測定した値である。鉛筆硬度が上記で規定する範囲内にあることで遮熱フィルムに耐擦傷性を付与することができる。また、本発明の近赤外線遮蔽フィルムにおいて、ハードコート層の積層順は特に制限ないが、耐擦傷性を付与するという観点からハードコート層は、近赤外線遮蔽フィルムの少なくとも一方の最表層に配置することが好ましい。
中心線平均粗さ(Ra)は光干渉式の表面粗さ測定器で測定することができ、例えば、WYKO社製非接触表面微細形状計測装置WYKO NT-2000を用いて測定することができる。
粘着層の表面には、本発明の近赤外線遮蔽フィルムが、例えばウインドウフィルムとして用いられる前には、剥離シート(セパレーターともいう。)を備えることが好ましい。
〔近赤外線遮蔽フィルム101の作製〕
図1で示す近赤外線遮蔽フィルムを下記手順にて作製した。
透明基材として厚さ50μmのポリエチレンテレフタレートフィルム(東洋紡株式会社製、コスモシャインA4300、両面昜接着処理、略称:PET)を用いた。
以下、本発明に係る樹脂Aをヒドロキシ基タイプ、樹脂Bをカルボキシ基タイプ、樹脂Cを、ヒドロキシ基/カルボキシ基タイプとして、説明する。
近赤外線遮蔽フィルム101の作製において、本発明に係る樹脂A、樹脂B及び樹脂Cで規定される樹脂の種類を、表1に記載のようにそれぞれ変化させて用いた以外は同様にして、以下のように近赤外線遮蔽フィルム102~123を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、エチルアクリレート(EA)、エチルヘキシルアクリレート(EHA)、2-ヒドロキシエチルアクリレート(HEA)、アクリル酸(AA)をEA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム102を作製した。
窒素気流下の三ツ口フラスコに、エチルアクリレート37.85部、エチルヘキシルアクリレート60部、2-ヒドロキエチルアクリレート0.1部、アクリル酸2.05部、酢酸エチル400部及びα、α′-アゾビスイソブチロニトリル3部を入れ、窒素気流中80℃のオイルバスで6時間反応させた。その後、酢酸エチルの沸点で1時間還流を行いアクリル系共重合体1を得た。GPCを用いて測定した重量平均分子量は約65万であった。(固形分20%溶液)
[近赤外線遮蔽フィルム103の作製]
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、エチルアクリレート(EA)、2-ヒドロキシエチルアクリレート(HEA)、ブチルアクリレート(BA)、アクリル酸(AA)をEA/BA/HEA/AA=12.85/80/0.1/7.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価0.5mgKOH/g未満、ヒドロキシ価55mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム103を作製した。
近赤外線遮蔽フィルム101の作製において、カルボキシ基タイプのアクリル系粘着樹脂を、EA/BA/AA=32.94/60/7.06の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:55万、酸価55mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム104を作製した。
近赤外線遮蔽フィルム101の作製において、カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/AA=39.74/60/0.26の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:75万、酸価2mgKOH/g)を用いた他は、近赤外線遮蔽フィルム102と同様の操作を行い、近赤外線遮蔽フィルム105を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/BA/2HEA/AA=18.65/80/0.2/1.15の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価1mgKOH/g、ヒドロキシ価9mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム106を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/BA/2HEA/MA=34.9/60/0.1/5の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0mgKOH/g、ヒドロキシ価0.5mgKOH/g未満)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム107を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/BA/2HEA/AA=30.27/60/0.1/9.63の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:63万、酸価0.5mgKOH/g未満、ヒドロキシ価75mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム108を作製した。
近赤外線遮蔽フィルム101の作製において、カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/AA=39.9/60/0.1の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:55万、酸価1mgKOH/g未満、)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム109を作製した。
近赤外線遮蔽フィルム101の作製において、カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/AA=30.37/60/9.63の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:50万、酸価75mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム110を作製した。
ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)、及びカルボキシ基タイプのアクリル系粘着樹脂(酸価6.8のアクリル系粘着樹脂:商品名:SK2094、綜研化学(株)製)を、ヒドロキシイプのアクリル系粘着樹脂/カルボキシ基タイプのアクリル系粘着樹脂=50/50(固-固比)で添加し、かつ、UV吸収剤としてBASF社製 チヌビン477と硬化剤としてイソシアネート系架橋剤(日本ポリウレタン工業社製 コロネートHX)を上記アクリル系粘着樹脂/UV吸収剤/硬化剤=100/5/0.16(固-固比)で混合して粘着層形成用塗布液を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、CWO未添加の近赤外線遮蔽フィルム111を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム112を作製した。
近赤外線遮蔽フィルム10の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を用い、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム113を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/HEA/AA=12.85/80/0.1/7.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価0.5mgKOH/g未満、ヒドロキシ価55mgKOH/g)を用い、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂をEA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム114を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/HEA/AA=12.85/80/0.1/7.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を用い、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=37.71/60/1.65/0.64の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価5mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム115を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/HEA/AA=12.85/80/0.1/7.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を用い、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=31.29/60/1.65/7.06の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:61万、酸価8mgKOH/g、ヒドロキシ価55mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム116を作製した。
ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)、カルボキシ基タイプのアクリル系粘着樹脂(酸価6.8のアクリル系粘着樹脂:商品名:SK2094、綜研化学(株)製)、及びヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を、50/25/25(固-固比)で混合したものと、YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)を100/10(固-固比)で添加し、かつ、UV吸収剤としてBASF社製 チヌビン477と硬化剤としてイソシアネート系架橋剤(日本ポリウレタン工業社製 コロネートHX)を上記アクリル系粘着樹脂/UV吸収剤/硬化剤=100/5/0.16(固-固比)で混合した粘着層形成用塗布液を用いた他は近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム117を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/ BA/2HEA/AA=18.65/80/0.2/1.15の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価1mgKOH/g、ヒドロキシ価9mgKOH/g)を用い、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム118を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/BA/2HEA/MA=34.9/60/0.1/5の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価0mgKOH/g)を用い、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム119を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/BA/2HEA/AA=30.27/60/0.1/9.63の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:63万、酸価0.5mgKOH/g未満、ヒドロキシ価75mgKOH/g)を用い、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム120を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を用い、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=38.26/60/1.65/0.09の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:80万、酸価8mgKOH/g、ヒドロキシ価0.7mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム121を作製した。
近赤外線遮蔽フィルム101の作製において、ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を用い、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=28.72/60/1.65/9.63の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:60万、酸価8mgKOH/g、ヒドロキシ価75mgKOH/g)を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、近赤外線遮蔽フィルム122を作製した。
ヒドロキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を用い、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を用い、ヒドロキシイプのアクリル系粘着樹脂/(ヒドロキシ基/カルボキシ基タイプ)のアクリル系粘着樹脂=50/50(固-固比)で添加し、かつ、UV吸収剤としてBASF社製 チヌビン477と硬化剤としてイソシアネート系架橋剤(日本ポリウレタン工業社製 コロネートHX)を上記アクリル系粘着樹脂/UV吸収剤/硬化剤=100/5/0.16(固-固比)で混合して粘着層形成用塗布液を用いた他は、近赤外線遮蔽フィルム101と同様の操作を行い、CWO未添加の近赤外線遮蔽フィルム123を作製した。
得られた近赤外線遮蔽フィルム101~123について下記の評価を行った。
ヘイズは、日本電色工業株式会社製NDH7000を用いて、各種工業規格のプラスチック製品試験方法(JIS K7136・JIS K7361)に準拠して、23℃・55%RHの環境下で試料を測定した。
耐光性促進試験機として、カーボンアーク灯を用いたサンシャインウェザーメーター(表中SWOMと略記)を利用し、照度250W/cm2、40℃・50%RHにて2000時間照射後に、試料のヘイズを上記条件にて測定した。
試料を60℃・90%RH環境下で1000時間曝露した後に、ヘイズを上記条件にて測定した。
ヘイズ値が1.2%以下であるものが優れている。
(2)項の耐光性促進試験において、試料のL*a*b*色空間における初期との色差ΔEを算出し、変色評価を行った。ΔEが3.0未満のものが優れており、特に2.0未満はほとんど色変化を認識できない。
実施例1と同様にして、以下の近赤外線遮蔽フィルムを作製した。
YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)に、ヒドロキシ基タイプのアクリル系粘着樹脂(酸価0.5mgKOH/g未満、ヒドロキシ価9mgKOH/g:大成ファインケミカル社製 6LQ-002:固形分51.0%)を添加し、十分に撹拌、混合した後に、カルボキシ基タイプのアクリル系粘着樹脂(酸価6.8のアクリル系粘着樹脂:商品名:SK2094、綜研化学(株)製)を添加・撹拌した。
YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)に、ヒドロキシ基タイプのアクリル系粘着樹脂:EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を添加し、十分に撹拌、混合した後に、カルボキシ基タイプのアクリル系粘着樹脂(酸価6.8のアクリル系粘着樹脂:商品名:SK2094、綜研化学(株)製)を添加・撹拌した。
YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)に、ヒドロキシ基タイプのアクリル系粘着樹脂:EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を添加し、十分に撹拌、混合した後に、カルボキシ基タイプのアクリル系粘着樹脂:EA/BA/AA=32.94/60/7.06の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:55万、酸価55mgKOH/g)を添加・撹拌した。
YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)に、ヒドロキシ基タイプのアクリル系粘着樹脂:EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価9mgKOH/g)を添加し、十分に撹拌、混合した後に、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂:EA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を添加・撹拌した。
YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)に、ヒドロキシ基タイプのアクリル系粘着樹脂(酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g:大成ファインケミカル社製 6LQ-002:固形分51.0%)を添加し、十分に撹拌、混合した後に、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂:EA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を添加・撹拌した。
図2で示す構成の近赤外線遮蔽フィルムを以下の手順にて作製した。
25ミクロンのポリエチレンテレフタレートフィルム(東洋紡株式会社製、コスモシャインA4300、両面昜接着処理、略称:PET)を用いて、重層塗布可能なスライドホッパー塗布装置(スライドコーター)を用い、下記低屈折率層用塗布液L1及び高屈折率層用塗布液H1を45℃に保温しながら、45℃に加温した支持体に、高屈折率層及び低屈折率層のそれぞれの乾燥時の層厚が130nmになるようにして、低屈折率層9層、高屈折率層8層を交互に計17層の同時重層塗布を行った。
まず、10質量%の第2の金属酸化物粒子としてのコロイダルシリカ(日産化学工業株式会社製、スノーテックス(登録商標)OXS)水溶液680部と、4.0質量%のポリビニルアルコール(株式会社クラレ製、PVA-103:重合度300、ケン化度98.5mol%)水溶液30部と、3.0質量%のホウ酸水溶液150部とを混合し、分散した。純水を加え、全体として1000部のコロイダルシリカ分散液L1を調製した。
(コア・シェル粒子のコアとするルチル型酸化チタンの調製)
水中に、酸化チタン水和物を懸濁させ、TiO2に換算した時の濃度が100g/Lになるように、酸化チタンの水性懸濁液を調製した。10L(リットル)の該懸濁液に、30Lの水酸化ナトリウム水溶液(濃度10モル/L)を撹拌しながら加えた後、90℃に加熱し、5時間熟成させた。次いで、塩酸を用いて中和し、濾過後水を用いて洗浄した。
2kgの純水に、10.0質量%の酸化チタンゾル水系分散液0.5kgを加え、90℃に加熱した。次いで、SiO2に換算した時の濃度が2.0質量%であるように調製したケイ酸水溶液1.3kgを徐々に添加し、オートクレーブ中、175℃で18時間加熱処理を行い、更に濃縮して、コア粒子としてはルチル型構造を有する酸化チタンであり、被覆層としてはSiO2であるコア・シェル粒子(平均粒径:10nm)のゾル液(固
形分濃度20質量%)を得た。
上記で得られた固形分濃度20.0質量%の第1の金属酸化物粒子としてのコア・シェル粒子を含むゾル液28.9部と、1.92質量%のクエン酸水溶液10.5部と、10質量%のポリビニルアルコール(株式会社クラレ製、PVA-103:重合度300、ケン化度98.5mol%)水溶液2.0部と、3質量%のホウ酸水溶液9.0部とを混合して、コア・シェル粒子分散液H1を調製した。
透明基材として厚さ25μmのポリエチレンテレフタレートフィルム(東洋紡株式会社製、コスモシャインA4300、両面昜接着処理、略称:PET)を用いた。
更にアクリル系粘着樹脂コーポニールN-2147(日本合成化学工業社製 固形分35%)と硬化剤コロネートHXとチヌビン477を前記アクリル系粘着樹脂/UV吸収剤/硬化剤=100/5/0.16(固-固比)で混合して粘着層形成用塗布液2を得た。
近赤外線遮蔽フィルム129の粘着層形成用塗布液1に代えて、YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)に、ヒドロキシ基タイプのアクリル系粘着樹脂(酸価0.5mgKOH/g未満、ヒドロキシ価9mgKOH/g:大成ファインケミカル社製 6LQ-002:固形分51.0%)を添加し、十分に撹拌、混合した後に、カルボキシ基タイプのアクリル系粘着樹脂(酸価6.8のアクリル系粘着樹脂:商品名:SK2094、綜研化学(株)製)を添加・撹拌した。
近赤外線遮蔽フィルム129の粘着層形成用塗布液1に代えて、YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)に、ヒドロキシ基タイプのアクリル系粘着樹脂:EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を添加し、十分に撹拌、混合した後に、カルボキシ基タイプのアクリル系粘着樹脂(酸価6.8のアクリル系粘着樹脂:商品名:SK2094、綜研化学(株)製)を添加・撹拌した。
近赤外線遮蔽フィルム129の粘着層形成用塗布液1に代えて、YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)に、ヒドロキシ基タイプのアクリル系粘着樹脂:EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価16mgKOH/g)を添加し、十分に撹拌、混合した後に、カルボキシ基タイプのアクリル系粘着樹脂:EA/BA/AA=32.94/60/7.06の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:55万、酸価55mgKOH/g)を添加・撹拌した。
近赤外線遮蔽フィルム129の粘着層形成用塗布液1に代えて、YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)に、ヒドロキシ基タイプのアクリル系粘着樹脂:EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価9mgKOH/g)を添加し、十分に撹拌、混合した後に、ヒドロキシ基/カルボキシ基タイプのアクリル系粘着樹脂:EA/2EHA/2HEA/AA=37.07/60/1.65/1.28の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:70万、酸価8mgKOH/g、ヒドロキシ価10mgKOH/g)を添加・撹拌した。
近赤外線遮蔽フィルム129の粘着層形成用塗布液1に替わって、YMF-02A(住友金属鉱山(株)製:CWO分散物 固形分28.5%)に、ヒドロキシ基タイプのアクリル系粘着樹脂:EA/2EHA/HEA/AA=37.85/60/0.1/2.05の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:65万、酸価0.5mgKOH/g未満、ヒドロキシ価9mgKOH/g)を添加し、十分に撹拌、混合した後に、カルボキシ基タイプのアクリル系粘着樹脂を、EA/2EHA/AA=30.37/60/9.63の質量比で共重合して得られたアクリル酸エステル系共重合体(重量平均分子量:50万、酸価75mgKOH/g)を添加・撹拌した。
(5)耐候性試験後のヘイズ
試料を85℃・85%RH環境下で1000時間曝露した後に、ヘイズを上記条件にて測定した。ヘイズ値が1.2%以下であるものが優れている。
11 透明基材
12 粘着層
13 離形層(セパレータフィルム)
14 ハードコート層
15 粘着層2
U 反射層ユニット
ML 反射層群
T1~Tn 反射層
Claims (5)
- 透明基材の少なくとも一方の面上に、下記樹脂Aと、下記樹脂B又は樹脂Cの少なくとも一方と、下記酸化物微粒子Dとを含有する構成層を有することを特徴とする近赤外線遮蔽フィルム。
樹脂A:酸価が0.5mgKOH/g未満であり、かつヒドロキシ価が5~60mgKOH/gの範囲内である樹脂
樹脂B:酸価が1~60mgKOH/gの範囲内である樹脂
樹脂C:酸価が1mgKOH/g以上であり、かつヒドロキシ価が5~60mgKOH/gの範囲内である樹脂
酸化物微粒子D:タングステン酸化物微粒子又は複合タングステン酸化物微粒子 - 前記構成層が、粘着層であることを特徴とする請求項1に記載の近赤外線遮蔽フィルム。
- 前記構成層を設けた前記透明基材の少なくとも一方の面上に、800~1300nmの範囲内の波長の光を20%以上反射する近赤外線反射層を有することを特徴とする請求項1又は請求項2に記載の近赤外線遮蔽フィルム。
- 請求項1から請求項3までのいずれか一項に記載の近赤外線遮蔽フィルムを製造する製造方法であって、前記酸化物微粒子Dを、前記樹脂Aに分散及び混合させた後に、前記樹脂B又は前記樹脂Cの少なくとも一方を加えることを特徴とする近赤外線遮蔽フィルムの製造方法。
- 下記樹脂Aと、下記樹脂B又は樹脂Cの少なくとも一方と、下記酸化物微粒子Dとを含有することを特徴とする粘着剤組成物。
樹脂A:酸価が0.5mgKOH/g未満であり、かつヒドロキシ価が5~60mgKOH/gの範囲内である樹脂
樹脂B:酸価が1~60mgKOH/gの範囲内である樹脂
樹脂C:酸価が1mgKOH/g以上であり、かつヒドロキシ価が5~60mgKOH/gの範囲内の樹脂
酸化物微粒子D:タングステン酸化物微粒子又は複合タングステン酸化物微粒子
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JP6610660B2 (ja) | 2019-11-27 |
US10330837B2 (en) | 2019-06-25 |
CN107407753A (zh) | 2017-11-28 |
US20180081097A1 (en) | 2018-03-22 |
CN107407753B (zh) | 2019-10-01 |
JPWO2016158604A1 (ja) | 2018-02-01 |
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