TWI387790B - Infrared ray absorbing film - Google Patents

Description

Infrared absorbing film

The present invention relates to an infrared absorbing film, and more particularly to an excellent light absorbing property for a wavelength of a near-infrared region of 850 to 1300 nm, and has good visible light transmittance, excellent light resistance and weather resistance, and is used as a plasma display. A particularly useful infrared absorbing film such as a near infrared ray absorbing film.

A plasma display (PDP) is a device that discharges sealed helium molecules by plasma discharge between electrodes, and the generated ultraviolet light re-excites the fluorescent substance to emit light in the visible range to display a map.

In PDPs, it is known that illuminants emit near infrared rays. The near-infrared light acts on a peripheral electronic device such as a radiotelephone or a video recorder using a near-infrared remote control device, and has a possibility of hindering its normal operation, and thus it is required to block the near-infrared rays as much as possible.

Further, in the PDP, since the display surface is a flat surface, when external light is incident, light reflected from a wide range enters the eye at the same time, and it is difficult to see the picture. Therefore, it is necessary to prevent reflection of external light. Further, it is important to transmit the light emitted from the PDP at a predetermined light transmittance to achieve a good picture display or to perform color tone correction of the luminescent color.

In the PDP, for these requirements, a process is generally performed in which at least three functional films having at least (1) an electromagnetic wave blocking film, (2) a near infrared absorbing film, and (3) an antireflection film are provided on a display screen. The front panel is such that the anti-reflection film is on the outermost side (viewer side) (for example, see Patent Document 1). At this time, you must make at least 3 pieces of work separately. The thin films are bonded and they are inevitably costly.

Therefore, if a composite functional film in which an antireflection layer is laminated on a near infrared ray absorbing layer is formed in one film, the effect of cost reduction will be remarkable.

In recent years, from the viewpoint of cost reduction, by providing a near-infrared absorbing layer on the reverse side of the antireflection layer of the substrate in the outermost antireflection film, it has been developed to have antireflection properties in one film at the same time. And a functional film with near-infrared absorption properties. In the production of such a functional film, there are two methods including (1) forming a near-infrared absorbing layer on the reverse side of the antireflection film and (2) forming an antireflection layer on the reverse side of the near infrared absorbing film, but by any method Film loss occurs, so the cost reduction effect is small.

At present, the near-infrared absorbing film used in the PDP is a film mainly using an imonium-based organic dye, but the near-infrared absorbing film has poor light resistance and weather resistance, and the near-infrared absorption property deteriorates with time. .

For the near-infrared absorbing film for PDP, it is required to have excellent near-infrared absorption performance, and at the same time, it has good light resistance and weather resistance, and has high visible light transmittance. However, the reality is that a near-infrared absorbing film that satisfies these conditions has not been found so far.

In addition, so-called openings such as windows of various buildings and vehicles are formed of a transparent glass plate or a resin plate for allowing sunlight to enter. However, the sun rays contain ultraviolet rays and infrared rays other than visible light, and in particular, near-infrared rays of 800 to 2500 nm in infrared rays are called heat rays, and the temperature rises from the opening portion.

Therefore, in recent years, as a window material of various buildings and vehicles, a heat ray shielding material capable of shielding a heat ray while capturing sufficient visible light while suppressing the increase in indoor temperature while maintaining the brightness has been studied. Various programs.

For example, a heat ray-reflecting film in which a metal is vapor-deposited on a transparent resin film is attached, and the heat ray-reflecting film is adhered to a heat ray shielding plate on a transparent substrate such as a glass plate, an acrylic plate, or a polycarbonate plate (for example, see Patent Document 2). However, such a heat-reflecting film in which metal is vapor-deposited has excellent heat ray shielding performance, but has poor transparency, is insufficient to inject sufficient visible light, and has a disadvantage of increasing manufacturing cost.

In order to improve these disadvantages, various infrared shielding films in which an infrared shielding layer containing an infrared shielding agent is provided on a base film have been proposed (see, for example, Patent Document 3 and Patent Document 4).

However, such an infrared shielding film is required to have good visibility of visible light, and has a property of effectively shielding light of a wavelength in the near-infrared region, and has good light resistance and weather resistance, and can suppress deterioration of near-infrared absorption performance with time. Infrared masking films are not yet sufficient to meet these performance requirements.

In addition, an infrared absorbing film having a light transmittance of 300% or less in the near-infrared region of 800 to 1100 nm and having a high visible light transmittance (for example, see Patent Document 5) and light in the near infrared region of 800 to 1100 nm are also disclosed. A near-infrared-shielding reflection-reducing material having a light transmittance of 20% or less and a visible light transmittance of 50% or more (for example, see Patent Document 6).

However, up to now, the light transmittance of the wider near-infrared region of 850 to 1300 nm has not been developed to be 10% or less, and visible light is transmitted. An infrared absorbing film having a rate of 65% or more.

[Patent Document 1] Japanese Patent Publication No. 11-126024

[Patent Document 2] JP-A-61-277437

Patent Document 3: Japanese Patent Publication No. 7-100996

[Patent Document 4] JP-A-9-156025

[Patent Document 5] Japanese Patent Publication No. 11-305033

[Patent Document 6] JP-A-2002-6102

The present invention is in view of the above circumstances, and provides an excellent near-infrared absorption property, high visible light transmittance, excellent light resistance and weather resistance, and can suppress deterioration of near-infrared absorption performance with time, and is low in manufacturing cost. It is made for the purpose of using an infrared ray absorbing film such as a near-infrared ray absorbing film for PDP or a heat ray shielding film for various building or vehicle window materials.

In order to develop an infrared ray absorbing film having the above-described preferable properties, the inventors of the present invention conducted a special investigation and found that curing of an energy-curable resin composition containing an inorganic dye is provided on one side of the base film. The present invention has been completed based on the findings that the light transmittance of the entire region of at least a wavelength of 850 to 1300 nm is less than or equal to a certain value, and an infrared ray absorbing film having a visible light transmittance of a certain value or more.

That is, the present invention provides

(1) An infrared absorbing film comprising a base film and a cured layer formed of an energy-curable resin composition containing an inorganic dye provided on one surface thereof to have a wavelength of at least 850 to 1300 nm The light transmittance of the entire region is 10% or less, and the visible light transmittance is 65% or more.

(2) The infrared absorbing film according to (1) above, wherein in the xy chromaticity coordinates, x is 0.27 to 0.33, and y is 0.28 to 0.34.

(3) The infrared absorbing film according to the above item (1), wherein the energy curable resin composition is a thermosetting type or an active energy ray curing type.

The infrared absorbing film according to any one of the above aspects, wherein the inorganic dye is cerium-containing tungsten oxide.

The infrared ray absorbing film according to any one of the above aspects, wherein the absorbing film layer formed of the energy-curable resin composition containing an inorganic dye has an antireflection layer.

(6) The infrared ray absorbing film according to any one of the above aspects, wherein the cured material layer formed of the energy-curable resin composition containing an inorganic dye further contains an organic and/or inorganic filler.

(7) The infrared absorbing film according to Item (5), wherein the cured layer or the antireflection layer formed of the energy-curable resin composition containing the inorganic dye contains an organic system and/or Inorganic antistatic agent.

The infrared absorbing film of any one of the above-mentioned items (1) to (7) which has an adhesive layer on the other side surface of the base film. with

(9) The infrared absorbing film according to any one of the above items (1) to (8).

According to the present invention, it is possible to provide a light absorption performance of a wavelength of a near-infrared region of 850 to 1300 nm, and at the same time, a high transmittance of visible light, excellent light resistance and weather resistance, and suppression of near-infrared absorption performance at any time. An infrared absorbing film which is deteriorated at the same time and which is low in manufacturing cost.

The infrared ray absorbing film can be used as a heat ray shielding film for a near-infrared absorbing film for PDP or a window material for various buildings or vehicles, and is particularly suitable for use as a near-infrared absorbing film for PDP.

The infrared absorbing film of the present invention has a base film and a cured product layer formed of an energy-curable resin composition containing an inorganic dye provided on one surface thereof.

The base film is not particularly limited, and can be appropriately selected from plastic films known as a substrate of an infrared absorbing film. As such a plastic film, for example, a polyester film such as polyethylene terephthalate, polybutylene terephthalate or polyethylene naphthalate; a polyethylene film, a polypropylene film, and celluloid can be cited. (cellophane), diacetyl cellulose film, triethylene glycol cellulose film, ethylene glycol cellulose butyrate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-acetic acid Ethylene copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polyfluorene film, polyetheretherketone film, polyether fluorene film, polyether quinone film, polyimine film, A fluorine-containing resin film, a polyamide film, an acrylic resin film, a norbornene resin film, a cycloolefin resin film, or the like.

These base film may be either transparent or translucent, and may be colored or uncolored, and may be appropriately selected depending on the use.

The thickness of these base film is not particularly limited and may be appropriately selected, and is usually in the range of 15 to 250 μm, preferably 30 to 200 μm. In addition For the purpose of improving the adhesion to the layer provided on the surface thereof, one or both surfaces of the base film may be subjected to surface treatment by an oxidation method, a roughening method, or the like as needed. Examples of the oxidation method include corona discharge treatment, plasma treatment, chromic acid treatment (wet method), flame treatment, hot air treatment, and ozone. UV irradiation treatment, etc. In addition, examples of the embossing method include a sand blast method, a solvent treatment method, and the like. These surface treatment methods can be appropriately selected depending on the type of the base film. In general, a corona discharge treatment method is preferably used from the viewpoints of effects and workability. Further, it is also possible to use a substrate film which has been subjected to a primer treatment on one or both sides.

In the infrared absorbing film of the present invention, at least one side of the base film is provided with a cured layer formed of an energy curable resin composition containing an inorganic dye (hereinafter referred to as a cured layer containing an inorganic dye). ).

Here, examples of the energy curable resin composition include a thermosetting resin composition or an active energy ray curable resin composition.

The thermosetting resin composition is not particularly limited, and can be appropriately selected from the conventionally known thermosetting resin compositions. The thermosetting resin composition usually contains a thermosetting resin as a basic component, and further contains other resins, a curing agent, and the like as desired.

Examples of the thermosetting resin include an acrylate polymer having a carbon-carbon double bond or a glycidyl group, an unsaturated polyester, an isoprene polymer, a butadiene polymer, an epoxy resin, and a phenol. Resin, urea resin, melamine resin, etc. These may be used alone or in combination of two or more.

Further, examples of the other resin include a vinyl resin, a urethane resin, a polyester, a polyamide, a polycarbonate, a polyimide, a nitrile resin, and an anthrone resin. These resins are used in order to adjust the viscosity of the coating liquid or to impart the desired physical properties to the cured material layer, and they may be used singly or in combination of two or more kinds.

Further, examples of the curing agent include organic peroxides such as diphenylhydrazine peroxide, dilaurin peroxide, tert-butyl peroxybenzoate, and bis(2-ethylhexyl)peroxydicarbonate; , 2'-azobisisobutyronitrile, 2,2'-azobis-2-methylbutyronitrile, 2,2'-azodimethylvaleronitrile and other azo compounds; toluene diisocyanate, diphenyl Polyisocyanate compounds such as methane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate; polyamines such as phenylenediamine, hexamethylenetetramine, isophorone diamine, and diaminodiphenylmethane Anhydride such as dodecenyl succinic anhydride, phthalic anhydride or tetrahydrophthalic anhydride; imidazole or dicyandiamide such as 2-methylimidazole, 2-ethylimidazole or 2-phenylimidazole ; p-toluenesulfonic acid, trifluoromethanesulfonic acid and the like Lewis acid; formaldehyde and the like. These curing agents can be appropriately selected depending on the kind of the thermosetting resin to be used.

On the other hand, the active energy ray-curable resin composition contains an active energy ray-curable compound as a basic component, and if necessary, a photopolymerization initiator or the like.

Here, the active energy ray-curable compound refers to a compound which is crosslinked and cured by irradiation of a ray having an energy beam of one of an electromagnetic wave or a charged particle beam, that is, an ultraviolet ray or an electron beam.

As such an active energy ray-curable compound, for example, an active energy ray-polymerizable prepolymer and/or an active energy ray-polymerizable monomer may be mentioned. . The above-mentioned active energy ray-polymerizable prepolymer includes a radical polymerization type and a cationic polymerization type, and examples of the radical polymerization type active energy ray-polymerizable prepolymer include polyester acrylates, epoxy acrylates, and amines. Formic acid acrylates, polyol acrylates, and the like. In the polyester acrylate-based prepolymer, for example, a hydroxyl group of a polyester oligomer having a hydroxyl group at both terminals obtained by condensing a polyvalent carboxylic acid and a polyhydric alcohol can be esterified with (meth)acrylic acid or passed through The terminal hydroxyl group of the oligomer obtained by adding an alkylene oxide to a polyvalent carboxylic acid is esterified with (meth)acrylic acid.

The epoxy acrylate-based prepolymer can be obtained, for example, by esterifying an oxirane ring of a lower molecular weight bisphenol type epoxy resin or a novolac type epoxy resin with (meth)acrylic acid. The urethane acrylate prepolymer can be produced, for example, by esterifying a polyurethane oligomer obtained by a reaction of a polyether polyol or a polyester polyol with a polyisocyanate with (meth)acrylic acid. Got it. Further, the polyol acrylate-based prepolymer can be obtained, for example, by esterifying a hydroxyl group of a polyether polyol with (meth)acrylic acid. These activated energy ray-polymerizable prepolymers may be used alone or in combination of two or more.

On the other hand, as the cationic polymerization type active energy ray-polymerizable prepolymer, an epoxy resin is usually used. Examples of the epoxy resin include a compound obtained by cyclizing a polyhydric phenol such as a bisphenol resin or a phenol resin with epichlorohydrin or the like, and a linear olefin compound or a cyclic olefin compound using a peroxide or the like. The obtained compound or the like is oxidized.

Examples of the active energy ray-polymerizable monomer include 1,4-butanediol di(meth)acrylate and 1,6-hexanediol di(meth)acrylate. , neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, neopentyl glycol adipate di(meth)acrylate, hydroxypivalic acid neopentyl glycol (Meth) acrylate, dicyclopentanyl di(meth) acrylate, caprolactone modified dicyclopentenyl di(meth) acrylate, ethylene oxide modified phosphoric acid di(A) Acrylate, allylcyclohexyl di(meth)acrylate, isocyanurate di(meth)acrylate, trimethylolpropane tri(meth)acrylate, dipentaerythritol Tris(meth)acrylate, propionic acid modified dipentaerythritol tri(meth)acrylate, pentaerythritol tri(meth)acrylate, propylene oxide modified trimethylolpropane III (Meth)acrylate, tris(propyleneoxyethyl)isocyanurate, propionic acid modified dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(methyl) A polyfunctional acrylate such as acrylate or caprolactone-modified dipentaerythritol hexa(meth)acrylate. These activated energy ray-polymerizable monomers may be used singly or in combination of two or more kinds, and may be used in combination with the above-mentioned active energy ray-polymerizable prepolymer.

As the photopolymerization initiator to be used, examples of the radical polymerization type active energy ray-polymerizable prepolymer or the active energy ray-polymerizable monomer include benzoin, benzoin methyl ether, and benzoin ethyl ether. Benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone , 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl 1-[4-(methylthio)phenyl]-2-morpholinylpropan-1-one, 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl) ketone , benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylindole, 2-ethylhydrazine, 2- Tributyl hydrazine Bismuth, 2-aminopurine, 2-methyl thioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2 4-Diethylthioxanthone, benzyldimethylketal, acetophenone dimethyl ketal, p-dimethylaminobenzoate, and the like. In addition, examples of the photopolymerization initiator for the cationic polymerization type active energy ray-polymerizable prepolymer include cerium ions such as aromatic cerium ions, aromatic ketone sulfonium ions, and aromatic iodonium ions, and tetrafluoroborate. A compound composed of an anion such as hexafluorophosphate, hexafluoroantimonate or hexafluoroarsenate. These may be used alone or in combination of two or more kinds, and the amount thereof is usually from 0.2 to 10 with respect to 100 parts by mass of the above-mentioned activated energy ray-polymerizable prepolymer and/or active energy ray-polymerizable monomer. Choose within the range of parts by mass.

The inorganic dye (inorganic near-infrared ray absorbing agent) contained in the thermosetting resin composition or the active energy ray-curable resin composition can be made to have light passing through at least a wavelength of at least 850 to 1300 nm. The infrared ray absorbing film having a light transmittance of 10% or less and a visible light transmittance of 65% or more is not particularly limited, and can be appropriately selected from various types.

Examples of the inorganic dye include a tungsten oxide compound, titanium oxide, zirconium oxide, hafnium oxide, tantalum oxide, zinc oxide, indium oxide, tin-doped indium oxide (ITO), tin oxide, and antimony-doped tin oxide (ATO). ), cerium oxide, zinc sulfide, and LaB ₆ , CeB ₆ , PrB ₆ , NdB ₆ , GdB ₆ , TbB ₆ , DyB ₆ , HoB ₆ , YB ₆ , SmB ₆ , EuB ₆ , ErB ₆ , TmB ₆ , YbB ₆ , hexaboride such as LuB ₆ , SrB ₆ , CaB ₆ , (La, Ce) B _{6 ,} and the like. Among them, from the viewpoint of high near-infrared absorption rate and high visible light transmittance, a tungsten oxide-based compound is preferable, and ruthenium-containing tungsten oxide is particularly preferably used.

In general, when an organic dye (organic near-infrared ray absorbing agent) is compared with an inorganic dye, it is preferably organic in terms of absorption ability of near-infrared rays, but in terms of light resistance and weather resistance, inorganic-based Very good. Further, the organic system has a drawback of being easily colored, and it is difficult to achieve a light transmittance of 10% or less in the region of 1100 to 1300 nm.

Therefore, in the present invention, an inorganic dye, particularly ruthenium-containing tungsten oxide, is preferably used. The inorganic dye has less absorption in the visible light region, and in the case of forming a clear coat layer, it is preferred to have a particle diameter of 0.5 μm or less, more preferably 0.1 μm or less.

In the present invention, the inorganic dye may be used singly or in combination of two or more kinds thereof, and an organic dye may be used in combination as desired within the range not impairing the object of the present invention. Here, examples of the organic dye include a cyanine compound; a squarylium compound; a thiol nickel complex salt compound; a naphthalocyanine compound; a phthalocyanine compound; a triarylmethane compound; Terpenoids; terpenoids; and N,N,N',N'-tetrakis(p-di-n-butylaminophenyl)-p-phenylenediamine perchlorate, phenyldiammonium hydrochloride, a hexafluoroantimonate of benzodiazepine, a fluorinated borate of phenyldiammonium, a fluoride salt of phenyldiammonium, an amine compound such as a perchlorate of ammonium benzoate or an ammonium compound; a copper compound and a dithiourea, A copper phosphate compound obtained by reacting a phosphorus compound with a copper compound, a phosphate compound, and a copper compound.

Among them, a preferred nickel thiolate compound (such as JP-A-9-230134) and a phthalocyanine compound have high light transmittance from visible light. Among the organic dyes, the fluorine-containing phthalocyanine compounds disclosed in JP-A-2000-26748 and the like are particularly suitable for use in the viewpoint of the heat resistance, the light resistance, and the weather resistance.

Further, even when an inorganic dye is used alone, for example, a portion having a light transmittance of more than 10% in a region having a wavelength of 850 to 1300 nm or a visible light transmittance of less than 65% may be used in combination of two or more kinds (at least one kind). The inorganic dye) may have a light transmittance of 10% or less in all regions having a wavelength of 850 to 1300 nm and a visible light transmittance of 65%.

The amount of the inorganic dye of the present invention is preferably such that the content of the inorganic dye in the cured layer is usually 10 to 60% by mass, preferably 20 to 40% by mass.

In the inorganic dye-containing cured product layer of the present invention, an organic and/or inorganic filler may be contained as an anti-glare agent. As the organic filler, for example, melamine resin particles, acrylic resin particles, acrylic-styrene copolymer particles, polycarbonate particles, polyethylene particles, polystyrene particles, benzoguanamine resin particles can be cited. Wait. The average particle diameter of these organic fillers is usually about 2 to 10 μm.

In addition, examples of the inorganic filler include an aggregate inorganic filler having an average particle diameter of about 0.5 to 10 μm, a vermiculite particle having an average particle diameter of about 0.5 to 10 μm, and a colloidal vermiculite particle agglomerated with an amine compound.

These antiglare agents may be used singly or in combination of two or more kinds, and the content in the cured layer is usually 2 to 15% by mass, preferably 3 to 8% by mass. The glossiness of the infrared absorbing film of the present invention at 60° is usually 30 to 120 by including the anti-glare agent in the cured layer.

In the present invention, the formation of a cured product layer containing an inorganic dye on the other side surface of the base film can be carried out, for example, by the method described below.

First, (1) a thermosetting resin composition containing an inorganic dye or (2) an active energy ray curable resin composition containing an inorganic dye.

In the above (1) thermosetting resin composition containing an inorganic dye, the thermosetting resin, the inorganic dye-containing near-infrared ray absorbing agent, and the other resin and curing agent which are used as desired may be added at a predetermined ratio. It is prepared by an anti-glare agent and various additives such as an antioxidant, a UV absorber, a leveling agent, an antifoaming agent, and the like.

On the other hand, in the above (2) active energy ray-curable resin composition containing an inorganic dye, the active energy ray-curable compound, the inorganic dye-containing near-infrared ray absorbing agent, and the like may be added at a predetermined ratio. The above photopolymerization initiator, antiglare agent, and various additives such as an antioxidant, an ultraviolet absorber, a light stabilizer, a leveling agent, an antifoaming agent, and the like are used for preparation.

Then, the above (1) inorganic dye-containing thermosetting resin composition or (2) inorganic dye-containing active energy ray-curable resin composition is added to a solvent, and each is prepared into a thermosetting coating liquid or Activated energy ray-curable coating liquid.

Examples of the solvent to be used in this case include aliphatic hydrocarbons such as hexane, heptane, and cyclohexane; aromatic hydrocarbons such as toluene and xylene; halogenated hydrocarbons such as dichloromethane and dichloroethane; and methanol and ethanol. , alcohols such as propanol, butanol, 1-methoxy-2-propanol, acetone, methyl ethyl ketone, 2-pentyl Ketones such as ketone, methyl isobutyl ketone and isophorone; esters such as ethyl acetate and butyl acetate; and cellosolve solvents such as ethyl cellosolve.

The concentration and viscosity of the coating liquid prepared in this manner are not particularly limited as long as they are the concentration and viscosity that can be applied, and may be appropriately selected depending on the case.

Next, the above coating liquid is applied by a conventionally known method such as a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method, or the like. On one side of the substrate film, a coating film is formed and dried.

When the coating liquid is a heat curing type, it may be heated and cured by using a thermostatic bath or an infrared heating lamp. Thus, a cured product layer containing an inorganic dye can be formed. As the heating conditions, the temperature is preferably in the range of 100 to 130 ° C, and the heating time is about 2 to 5 minutes.

On the other hand, when the coating liquid is an active energy ray-curable type, the dried coating film can be cured by irradiating an active energy ray to form a cured product layer containing an inorganic dye.

Examples of the active energy ray include an ultraviolet ray or an electron beam lamp. The above ultraviolet rays can be obtained from a high pressure mercury lamp, a molten H lamp (Fusion H ramg), a xenon lamp or the like. Further, the electron beam can be obtained by an electron accelerator or the like. Among these active energy rays, ultraviolet rays are particularly suitable. Further, when an electron beam is used, a cured layer can be obtained without adding a polymerization initiator.

In the present invention, the active energy ray-curable coating liquid is more preferable than the thermosetting coating liquid from the viewpoint of obtaining excellent scratch resistance of the obtained infrared absorbing film.

Further, the thickness of the inorganic dye-containing cured product layer is preferably in the range of 2 to 15 μm, and more preferably 4 to 10 μm.

When the infrared absorbing film of the present invention is used for, for example, a PDP, an antireflection layer may be provided on the cured layer containing the inorganic dye as needed.

The method for forming the antireflection layer is not particularly limited, and any conventionally known methods such as dry method and wet method can be used, but in the present invention, it is preferred to provide an activated energy ray by a wet method. An antireflection layer composed of a resin that is cured by irradiation and a low refractive index layer of porous vermiculite particles.

The low refractive index layer containing the resin which is cured by irradiation with an active energy ray and the porous vermiculite particles can be, for example, an active energy ray-curable compound, porous vermiculite particles, and a photopolymerization initiator according to a desired one. The coating liquid for forming a low refractive index layer is applied onto the cured product layer containing the inorganic dye to form a coating film, and is further formed by curing the coating film with an active energy ray.

The above-mentioned active energy ray-curable compound and, if necessary, a photopolymerization initiator are as shown in the description of the above-mentioned inorganic dye-containing cured product layer.

As the porous vermiculite particles contained in the low refractive index layer, porous vermiculite particles having a specific gravity of 1.7 to 1.9, a refractive index of 1.25 to 1.36, and an average particle size of 20 to 100 nm are preferably used. By using the porous vermiculite particles having such a property, an anti-reflection layer excellent in antireflection performance can be obtained as a one-layer type infrared absorbing film.

In the present invention, the inclusion of the porous vermiculite particles in the low refractive index layer The amount is preferably selected in the range of 30 to 80% by mass. When the content of the porous vermiculite particles falls within the above range, the low refractive index layer can be a layer having a desired low refractive index, and the obtained infrared absorbing film can be excellent in antireflection performance. The content of the porous vermiculite particles is preferably from 50 to 80% by mass, particularly preferably from 60 to 75% by mass.

The low refractive index layer has a thickness of 50 to 200 nm, preferably 70 to 130 nm, a refractive index of 1.43 or less, preferably 1.30 to 1.42, more preferably 1.35 to 1.40. When the thickness or refractive index of the low refractive index layer falls within the above range, an infrared absorbing film excellent in antireflection performance and scratch resistance can be obtained.

Further, the refractive index of the inorganic dye-containing cured layer under the low refractive index layer is usually from 1.47 to 1.60, preferably from 1.49 to 1.55.

In the coating liquid for forming a low refractive index layer to be used in the present invention, the above-mentioned active energy ray-curable resin, porous vermiculite particles, and the above-mentioned photopolymerization initiator which are used as desired, and Various additives such as an antioxidant, an ultraviolet absorber, a light stabilizer, a leveling agent, an antifoaming agent, and the like are added to a suitable solvent to be dissolved or dispersed to prepare.

The solvent used at this time is as shown in the description of the above-mentioned coating liquid for forming a cured layer containing an inorganic dye.

The concentration and viscosity of the coating liquid prepared as described above are not particularly limited as long as they are applicable to the concentration and viscosity that can be applied, and may be appropriately selected depending on the case.

The coating liquid is applied by a conventionally known method such as a bar coating method, a knife coating method, a roll coating method, a knife coating method, a die coating method, a gravure coating method, or the like. A coating film is formed on the cured product layer containing the inorganic dye, dried, and then irradiated with an active energy ray to cure the coating film, whereby a desired low refractive index layer can be formed.

The activation energy ray is as shown in the description of the above-mentioned inorganic dye-containing cured layer.

In the present invention, when the formation of the inorganic dye-containing cured product layer is carried out by using an active energy ray-curable coating liquid, the formation of the inorganic dye-containing cured material layer and the low refractive index layer is carried out by the following method. better.

First, an active energy ray-curable coating liquid for forming an inorganic pigment-containing cured product is applied onto one surface of a base film to form a coating film, and then irradiated with an active energy ray to be cured in a semi-cured state. At this time, when ultraviolet rays are irradiated, the amount of light is usually 50 to 150 mJ/cm ² . Next, a coating liquid for forming a low refractive index layer is applied onto the cured layer in the semi-cured state thus formed to form a coating film, and the active energy ray is sufficiently irradiated to completely cure the cured layer in the semi-cured state. At this time, when ultraviolet rays are irradiated, the amount of light is usually about 400 to 1000 mJ/cm ² . Further, when the inorganic dye-containing cured product layer and/or the low refractive index layer are completely cured, in order to prevent oxygen from interfering with curing, the active energy ray may be irradiated under an ambient gas such as nitrogen. In this case, the oxygen concentration is preferably low, preferably 2% by volume or less.

In this manner, the inorganic dye-containing cured layer and the low refractive index layer can be formed on one side of the base film smoothly and with good interlayer adhesion.

In the infrared absorbing film of the present invention, the inorganic dye-containing solid The organic layer and/or the inorganic antistatic agent may be contained in the chemical layer or the antireflection layer. By containing the antistatic agent, dust, dust, or the like can be hardly adhered to the obtained infrared absorbing film.

The organic antistatic agent is not particularly limited, and at least one selected from the group consisting of conventionally known nonionic, anionic, cationic, and amphoteric antistatic agents can be used. Among them, a cationic antistatic agent having one or more quaternary ammonium salt groups in the molecule is preferred from the viewpoints of effects and uniform dispersibility.

The cationic antistatic agent having a quaternary ammonium salt group may be either a low molecular type or a high molecular type, but a polymer type cationic antistatic is preferable from the viewpoints of persistence of effect and prevention of bleeding or gas generation. Agent.

As the polymer type cationic antistatic agent, any one of conventionally known ones can be appropriately selected and used. Specifically, a polymer having a quaternary ammonium salt group represented by the formula (I) in a molecule is preferably exemplified.

(wherein R ¹ and R ² are each the same or different and represent an alkyl group having 1 to 10 carbon atoms, and R ³ represents an alkyl group having 1 to 10 carbon atoms or an aralkyl group having 7 to 10 carbon atoms; Base, Xn- represents an n-valent anion, and n represents an integer from 1 to 4).

In the above formula (I), the alkyl group represented by R ¹ and R ^{2 and} the alkyl group in R 3 are preferably an alkyl group having 1 to 6 carbon atoms, particularly an alkane having 1 to 4 carbon atoms. Further, as the aralkyl group in R ³ , a benzyl group is preferred. Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a second butyl group, and a third butyl group.

On the other hand, X ^n- may be any of an inorganic anion and an organic anion, and examples thereof include F ^- , Cl ^- , Br ^- , I ^- halide ions, NO ₃ ^- , ClO ₄ ^- , BF. ₄ ^- , CO ₃ ^2- , SO ₄ ^2- and other inorganic anions, CH ₃ OSO ₃ ^- , C ₂ H ₅ OSO ₃ ^- , and from acetic acid, malonic acid, succinic acid, maleic acid, fumaric acid, An organic anion of a residue of an organic acid such as toluenesulfonic acid or trifluoroacetic acid.

Examples of such a polymer-based quaternary ammonium salt-based antistatic agent include the following compounds, namely, a polyvinylbenzyl type [(a)], a poly(meth)acrylate type [(b)], Styrene-(meth)acrylate copolymer type [(c)], styrene-maleimide copolymer type [(d)], methacrylate-methacrylimide copolymer type [ (e)] and so on. Further, in the copolymer type of (c), (d) and (e), any of a random copolymer type and a block copolymer type may be used.

(x, y, w: degree of polymerization)

In the present invention, the polymer type cationic antistatic agent may be used singly or in combination of two or more kinds.

On the other hand, as the low molecular type cationic antistatic agent, for example, a compound having a quaternary ammonium salt group represented by the general formula (II) is preferably exemplified.

(wherein A represents an alkyl group having 10 to 30 carbon atoms, and R ⁴ and R ⁵ are each the same or different and represent an alkyl group having 1 to 10 carbon atoms, and R ⁶ represents a carbon number of 1 to 10; An alkyl group or an aralkyl group having 7 to 10 carbon atoms, Y ^m- represents an m-valent anion, and m represents an integer of 1 to 4).

Examples of A in the above formula (II) include a decyl group such as a lauryl group such as a lauryl group or a myristyl group such as a myristyl group, or a hexadecyl group such as a palmity group or a stearyl group such as a stearyl group. Alkyl, behenyl or the like.

Further, R ⁴ , R ⁵ , R ⁶ , Y ^m- and m are each the same as R ¹ , R ² , R ³ , X ^n- and n in the formula (I).

In the present invention, the low molecular weight cationic antistatic agent may be used singly or in combination of two or more kinds.

Further, in the present invention, as the antistatic agent, a reactive cationic antistatic agent having one or more quaternary ammonium salt groups and one or more polymerizable unsaturated groups in the molecule may be used.

Using such a reactive cationic antistatic agent, it is solid-set with the above-mentioned thermosetting or activation energy when applying thermal energy or irradiating an active energy ray. Since the compound is copolymerized and enters the chain of the formed polymer, the durability of the antistatic property of the obtained infrared absorbing film is improved.

The reactive cation-based antistatic agent may, for example, be a reactive quaternary ammonium salt compound represented by the formula (III).

(wherein R represents a hydrogen atom or a methyl group).

In the present invention, the reactive cationic antistatic agent may be used singly or in combination of two or more kinds. Further, the polymer type cationic antistatic agent, the low molecular type cationic antistatic agent, and the reactive cationic antistatic agent may be used in combination as appropriate.

On the other hand, the inorganic antistatic agent is not particularly limited, and a ruthenium sol having a decyl group obtained by hydrolysis or condensation reaction using a conventionally known transparent conductive filler or a tetraalkoxy decane can be used. An alkoxy group-based polymer having an alcohol group or other hydrophilic group. These inorganic antistatic agents may be used singly or in combination of two or more kinds, and may be used in combination with the above-mentioned organic antistatic agent.

In the present invention, the content of the antistatic agent in the inorganic dye-containing cured layer or the antireflection layer can be appropriately selected depending on the type thereof. For example, in the case of an organic antistatic agent, it is usually selected to be 2 to 25 masses. The range of %. When the content of the antistatic agent falls within the above range, the infrared absorbing film can exhibit good antistatic properties without adversely affecting other properties. The content is preferably from 3 to 25% by mass, more preferably from 5 to 20% by mass. Here, as the antistatic property, for example, the surface resistivity is 3 × 10 ¹³ (Ω / □) or less, preferably 3 × 10 ¹² (Ω / □) under normal temperature and humidity conditions (23 ° C, 50% RH). the following.

The infrared absorbing film of the present invention thus produced has a light transmittance of at least 10% in all regions having a wavelength of at least 850 to 1300 nm and a visible light transmittance of 65% or more. When the light transmittance of the above-mentioned wavelength is 10% or less, when the infrared absorbing film of the present invention is used for the front panel of the PDP, the near infrared rays generated by the PDP can be effectively prevented from being applied to surrounding electronic devices (for example, wireless phones, use). The video recorder of the near-infrared remote control device, etc.) causes an erroneous operation. Further, when used as a heat ray shielding film for a building or a vehicle window material or the like, it is possible to effectively shield heat rays in sunlight.

In addition, when the visible light transmittance is 65% or more, even if the infrared absorbing film of the present invention is used for the front panel of the PDP, the visibility (display screen) of the PDP is excellent. Further, when used as a heat ray shielding film for a building or a vehicle window material or the like, sufficient visible light can be entered into the room to keep it bright.

In the infrared absorbing film of the present invention, when an antireflection layer is provided on the cured layer containing the inorganic dye, the reflectance at a wavelength of 500 to 700 nm is usually 6% or less. Further, the haze value is usually less than 3%, but when the anti-glare agent is contained in the cured layer containing the inorganic dye, it is about 3 to 30%.

In the infrared absorbing film of the present invention, in the xy dye coordinates, x is shown to be 0.27 to 0.33, and y is shown to be 0.28 to 0.34.

The colorimetric method using the tristimulus value XYZ is a color system established by the CIE (International Commission on Illumination) at the 1931 conference, also known as the CIE color The system is the most suitable scientific method for color quantitative processing. In addition, the tristimulus value XYZ refers to an isochromic stimulus value of the three primary colors of light on the surface.

The chromaticity coordinates x and y of the chromatographic color are obtained from the tristimulus value XYZ of the chromatogram, and the xy chromaticity diagram (CIE chromaticity diagram) is represented by the coordinate space in which the x, y is the coordinate space of the orthogonal axis. The RGB curve shown in Figure 1. Figure 1 shows the CIE chromaticity diagram.

The chromaticity of all the colors falls in the pattern surrounded by the RGB curve and the RB line.

In the infrared absorbing film of the present invention, in the CIE chromaticity diagram, x generally falls within the range of 0.27 to 0.33, and y falls within the range of 0.28 to 0.34.

In the infrared ray absorbing film of the present invention, an antifouling layer may be provided on the cured product layer or the antireflection layer containing the inorganic dye. The antifouling layer can be usually applied to a coating liquid including a fluorine-containing resin by a conventionally known method such as a bar coating method, a knife coating method, a roll coating method, a knife coating method, a die coating method, a gravure coating method, or the like. Each of the above layers is formed into a coating film and dried.

The thickness of the antifouling layer is usually in the range of 1 to 10 nm, preferably 3 to 8 nm. By providing the antifouling layer, the surface of the obtained infrared absorbing film can be made smooth and not easily contaminated.

In the infrared absorbing film of the present invention, an adhesive layer for bonding to the adherend can be formed on the side opposite to the inorganic dye-containing cured product layer of the base film. As the adhesive constituting the adhesive layer, for example, an acrylic adhesive or a urethane adhesive is preferably used. , anthrone adhesives. The thickness of the adhesive layer is usually in the range of 5 to 50 μm.

Further, when the infrared ray absorbing film of the present invention is used as a near-infrared ray absorbing film for a PDP, the above-mentioned pressure-sensitive adhesive layer may further contain a dye or a pigment in order to correct the color of the luminescent color of the display device.

Further, a release film may be provided on the adhesive layer. Examples of the release film include release films coated with a release agent such as an anthrone resin on papers such as cellophane, coated paper, and laminated paper, and various plastic films. The thickness of the release film is not particularly limited, but is usually about 20 to 150 μm.

The non-antireflection-type infrared absorbing film of the present invention can be used as a near-infrared ray absorbing film for PDP, a heat ray shielding film for window materials of various buildings or vehicles, and the like, and is particularly suitably used as a near-infrared absorbing film for PDP.

Further, the antireflection type infrared absorbing film of the present invention is particularly suitably used as a film having a near infrared absorbing and antireflection function for a PDP, which can simplify the layer structure of the PDP front panel.

[Examples]

Hereinafter, the present invention will be more specifically described by the examples, but the present invention is by no means limited by these examples.

Moreover, the physical properties of the infrared ray absorbing film obtained in each example were measured by the method shown below.

(1) Light transmittance of a wavelength of 850 to 1300 nm.

The transmittance of each wavelength was measured using "UV-3101PC" manufactured by Shimadzu Corporation.

(2) xy chromaticity coordinates

The measurement was carried out in accordance with JIS Z 8701-1999 using a spectrophotometer [UV-3101PC] manufactured by Shimadzu Corporation.

(3) visible light transmittance and haze value

The visible light transmittance (all light transmittance) and the haze value were measured in accordance with JIS K 7105 using a haze meter "NDH 2000" manufactured by Nippon Denshoku Industries Co., Ltd.

(4) Reflectance at wavelengths of 500 nm, 600 nm, and 700 nm

The reflectance at wavelengths of 500 nm, 600 nm, and 700 nm was measured using a spectrophotometer [UV-3101PC] manufactured by Shimadzu Corporation.

(5) 60° gloss

The gloss meter "VG 2000" manufactured by Nippon Denshoku Industries Co., Ltd. was used in accordance with JIS K 7105.

(6) scratch resistance

Using wire #0000, the wire was rubbed back and forth five times with a load of 9.8×10 ^-3 N/mm ² , and visual observation was performed, and the evaluation was performed according to the following criteria.

○: no bruises

×: There is a scratch

(7) Light resistance

The sample was attached to a glass plate with a transparent adhesive, placed in a light-resistant tester (carbon arc, blackboard temperature: 63 ° C), and ultraviolet rays were irradiated from the sample side for 200 hours, and various optical characteristics were evaluated.

(8) Surface resistivity

After the sample was conditioned at 23 ° C and a humidity of 50% for 24 hours, a digital electric light connected to Advantest was used in accordance with JIS K 6911. The parallel electrode on the scale was used to measure the surface resistivity of the surface layer.

Example 1

300 parts by mass of 100 parts by mass of a polyfunctional acrylate mixture (produced by Arakawa Chemical Co., Ltd., trade name "Beamset 575CB", solid content concentration 100%, containing a photopolymerization initiator] as an active energy ray curable compound Near-infrared absorbing agent [produced by Sumitomo Metal Mine Co., Ltd., trade name "YMF-01", content of cerium-containing tungsten oxide (with respect to tungsten, containing 33 mol% of cerium, average particle diameter of 30 nm) is 10% by mass The suspension had a total solid content concentration of 14% by mass], and then diluted with methyl isobutyl ketone (MIBK) to have a total solid content concentration of 30% by mass to prepare a coating liquid.

Then, the coating liquid was applied to a polyethylene terephthalate (PET) film which was subjected to adhesion treatment on both sides of a substrate film having a thickness of 100 μm by a Mayer bar No. 16. On the surface of Toyobo Co., Ltd., trade name "A4300", the thickness after curing was 7 μm. Next, after drying at 80 ° C for 1 minute, ultraviolet rays of a light amount of 250 mJ/cm ^{2 were} irradiated to prepare an infrared absorbing film.

The properties of the infrared absorbing film thus obtained are shown in Table 1.

Example 2

In Example 1, the coating liquid for forming an antireflection layer prepared as follows was applied onto a cured product layer containing a near-infrared ray absorbing agent having an ultraviolet light amount of 70 mJ/cm ² by a straw No. 4 to be cured. The thickness afterwards is 100 nm. Next, after drying at 80 ° C for 1 minute, ultraviolet rays of a light amount of 500 mJ/cm ^{2 were} irradiated to prepare an infrared absorbing film having an antireflection layer. The refractive index of the antireflection layer at this time was 1.38.

The properties of the infrared absorbing film thus produced are shown in Table 1.

<Preparation of coating liquid for forming an antireflection layer>

To 100 parts by mass of the multifunctional acrylate mixture [Production of Arakawa Chemical Co., Ltd., trade name "Beamset 575CB", solid content concentration 100%], 1200 parts by mass of porous vermiculite particles of methyl isobutyl ketone (MIBK) Dispersion [catalytic chemical industry (stock) production, trade name "ELCOM RT-1002 SIV", solid content concentration of 21% by mass, porous vermiculite particles: specific gravity of 1.8, refractive index of 1.30, average particle size 60 nm], and then diluted with MIBK to have a total solid content concentration of 2% by mass to prepare a coating liquid for forming an antireflection layer.

Example 3

300 parts by mass of 100 parts by mass of a polyfunctional acrylate mixture (produced by Arakawa Chemical Co., Ltd., trade name "Beamset 575CB", solid content concentration 100%, containing a photopolymerization initiator] as an active energy ray curable compound Near-infrared absorbing agent [Sumitomo Metal Mine (stock) production, trade name "YMF-01", suspension containing cerium oxide tungsten oxide (with respect to tungsten, containing 33 mol% of cerium) in a content of 10% by mass, total solids The content concentration was 14% by mass], and further added 5 parts by mass of a vermiculite particle as an anti-glare agent [Tosoh Silica (product), trade name "Nipsil E-200", average particle diameter 3 μm], and then diluted with MIBK In the same manner as in Example 1, except that the total solid content concentration was 30% by mass, and the coating liquid was prepared, an infrared absorbing film having antiglare property was prepared.

The properties of the infrared absorbing film thus produced are shown in Table 1.

Example 4

In addition to 130 parts by mass of an antistatic hard coating agent [JSR (manufactured by the company), trade name "De Solite KZ6163", the solid content concentration is 75 mass%] as In the same manner as in Example 1, except that 4 parts by mass of a photopolymerization initiator (manufactured by Ciba Specialty Chemicals Co., Ltd., trade name "Irgacure 907") was added to the active energy ray-curable compound in Example 1, infrared absorption was produced. film.

The properties of the infrared absorbing film thus produced are shown in Table 1.

Comparative example 1

100 parts by mass of polyester resin (produced by Toyobo Co., Ltd., trade name "Bayron 20SS", solid content concentration of 30% by mass, diluted with a mixed solvent of toluene and MEK] and 1 part by mass of representative near-infrared absorption (imonium-based pigment) [produced by Nippon Chemical Co., Ltd., trade name "KAYASORB IRG-022", solid content concentration of 100% (powder)], and further diluted with cyclohexane ketone to make total solid The coating liquid was prepared at a concentration of 12% by mass.

Then, the coating liquid was applied to the surface of a PET film (produced by Toyobo Co., Ltd., trade name "A4300") which was subjected to adhesion treatment on both sides of a substrate film having a thickness of 100 μm by using a straw No. The thickness after drying was 4 μm. Then, it was dried at 130 ° C for 2 minutes to prepare an infrared absorbing film.

The properties of the infrared absorbing film thus obtained are shown in Table 1.

(Light resistance: light resistance tester, 200 hours)

As can be seen from Table 1, in the infrared absorbing film of the present invention (Examples 1 to 4), the light transmittance in the initial value and the light transmittance in the light resistance were Among them, in all regions with a wavelength of 850 to 1300 nm, the light transmittance shows a value of less than 10%, and in the xy chromaticity coordinates, both the initial value and the light resistance are x at 0.27~ 0.33, y falls within the range of 0.28 to 0.34. Therefore, it is understood that the light resistance is extremely excellent.

In contrast, the initial value of the infrared absorbing film of Comparative Example 1 has a light transmittance of 1200 nm and a wavelength of more than 10% at 1300 nm, and the light transmittance in light resistance is in all regions of 850 to 1300 nm. Significantly improved (69% <) from the initial value, showing poor lightfastness.

Industrial applicability

The infrared ray absorbing film of the present invention is excellent in near-infrared absorbing performance at 850 to 1300 nm, high in visible light transmittance, excellent in light resistance and weather resistance, and capable of suppressing deterioration of near-infrared absorbing performance with time and low manufacturing cost. Therefore, it can be used as a heat ray shielding film for a near-infrared ray absorbing film for PDP or various window materials for buildings or vehicles, and is particularly suitable for use as a near-infrared absorbing film for PDP.

Figure 1 shows the CIE chromaticity diagram.

Claims (7)

An infrared absorbing film having a base film composed of polyester and a film having a near-infrared ray absorbing cured layer on one side thereof, wherein the cured layer is an ultraviolet curable resin composed of a multifunctional acrylate The composition contains 20 to 40% by mass of cerium-containing tungsten oxide having a particle diameter of 0.5 μm or less as a near-infrared ray absorbing agent, and further contains 3 to 8% by mass of melamine-based resin particles, acrylic resin particles, and acrylic-benzene. Ethylene copolymer particles, polycarbonate particles, polyethylene particles, polystyrene particles or benzoguanamine resin particles, organic resin particles having an average particle diameter of 2 to 10 μm or ruthenium having an average particle diameter of 0.5 to 10 μm An inorganic filler composed of agglomerates of stone particles or colloidal vermiculite particles having an average particle diameter of 0.5 to 10 μm is used as an anti-glare agent, and the film is transparent to light of at least a wavelength of 850 to 1300 nm. The light transmittance is 10% or less, and the visible light transmittance is 65% or more. An infrared absorbing film having a base film composed of polyester and a film having a near-infrared absorbing solidified layer and a single-layer anti-reflective layer on one side thereof, wherein the near-infrared absorbing solidified layer is composed of The ultraviolet curable resin composition comprising a functional acrylate contains 20 to 40% by mass of cerium-containing tungsten oxide having a particle diameter of 0.5 μm or less, and further contains 3 to 8% by mass of melamine-based resin particles and acrylic resin particles. And C Ordinary acid-styrene copolymer particles, polycarbonate particles, polyethylene particles, polystyrene particles or benzoguanamine resin particles, organic resin particles having an average particle diameter of 2 to 10 μm or an average particle diameter of 0.5 An inorganic filler composed of an aggregate of ~10 μm of vermiculite particles or an amine compound of colloidal vermiculite particles having an average particle diameter of 0.5 to 10 μm is used as an antiglare agent, and the monolayer antireflection layer is composed of polyfunctional acrylic acid. The ultraviolet curable resin composition composed of an ester contains 50 to 80% by mass of porous vermiculite particles having an average particle diameter of 20 to 100 nm, a specific gravity of 1.7 to 1.9, and a refractive index of 1.25 to 1.36, and the film has at least a wavelength of The light transmittance of the entire region of 850 to 1300 nm is 10% or less, and the visible light transmittance is 65% or more. The infrared absorbing film of claim 1 or 2, wherein in the xy chromaticity coordinates, x is 0.27 to 0.33, and y is 0.28 to 0.34. The infrared absorbing film according to claim 1 or 2, wherein the near-infrared absorbing cured layer or the single-layer anti-reflective layer contains an organic-based and/or inorganic-based antistatic agent. The infrared absorbing film of claim 3, wherein the near infrared ray absorbing cured layer or the single layer antireflective layer contains an organic and/or inorganic antistatic agent. An infrared absorbing film according to claim 1 or 2, wherein an adhesive layer is provided on the other side of the substrate film. An infrared absorbing film according to claim 1 or 2, which is used for a plasma display.