JP2002268569A - Optical filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a direct sticking type optical filter which not only has a conventional function to intercept near IR rays and electromagnetic waves emitting from a plasma display panel but also improves safeness for practical use. SOLUTION: The safeness of the optical filter for practical use is improved by using a flame-retardant material showing <30 seconds burning duration in the vertical flammability test specified by the UL standard 94 for the all transparent polymer films which constitute the optical filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical filter for a display, and more particularly to an optical filter suitably used for a plasma display panel.

[0002]

2. Description of the Related Art In recent years, as society has become more sophisticated, optoelectronics-related components and equipment have remarkably advanced.
Among them, a display for displaying an image is increasing in demand for a computer monitor and the like in addition to a conventional television device. Among them, market demands for larger and thinner displays are increasing. 2. Description of the Related Art Recently, a plasma display panel (PDP) has attracted attention as a display that can be made large and thin. The plasma display panel emits strong near-infrared rays and electromagnetic waves outside the device in principle. This near-infrared ray causes a malfunction of a cordless telephone, an infrared remote controller, and the like, particularly in a wavelength range of 800 to 1100 nm. In addition, electromagnetic waves cause damage to instruments, and recently there have been reports that electromagnetic waves cause damage to the human body. For this reason, regulations on the emission of electromagnetic waves are on a global trend, and in Japan, VCCI (Voluntary Control C)
owncil for Interference b
y data processing equipme
nt electronic office match
ine), in the United States, FCC (Federa)
l Communication Commissio
n).

In order to suppress the emission of near-infrared rays and electromagnetic waves, there has recently been an increasing demand for optical filters for shielding near-infrared rays and electromagnetic waves. As for near infrared shielding,
Conventionally, it is known to use a near-infrared absorbing film produced using a near-infrared absorbing dye. In this embodiment, (1) a transparent polymer film prepared by kneading a resin with a near-infrared absorbing dye; (2) a near-infrared absorbing dye dispersed and dissolved in a resin or a resin concentrate of a resin monomer / organic solvent; A polymer film prepared by a casting method, (3) a resin binder and an organic solvent near-infrared absorbing dye added thereto, coated as a coating on a transparent polymer film, and (4) a near-infrared absorbing dye. A material obtained by laminating an adhesive and a transparent polymer film is generally used. As for the near-infrared shielding function, there is a method using a transparent conductive film described later as a method other than the near-infrared absorbing dye.

On the other hand, with respect to electromagnetic wave shielding, there are two types of optical filters that are generally put into practical use: a method using a conductive mesh for a transparent conductive layer and a method using a transparent conductive film.
Although roughly classified into types, both of them cover the display surface with a highly conductive material to achieve an electromagnetic wave shielding effect.
The lower the sheet resistance of the conductive material, the better the electromagnetic wave shielding ability.

[0005] The conductive mesh type is a thin film in which a metal is arranged in a grid on a film serving as a substrate. Generally, a metal mesh, a synthetic fiber or a metal fiber coated with a metal, or a metal film is formed in a grid by etching. And the like formed in the above pattern are used. This conductive mesh type has high electro-magnetic wave shielding ability due to its excellent conductivity, but has problems such as low transparency and generation of moiré image. Furthermore, since the conductive mesh itself does not have a near-infrared shielding function, an optical filter is generally used in combination with the above-mentioned near-infrared absorbing dye.

On the other hand, the transparent conductive film type is one in which a transparent conductive thin film is disposed on the entire surface of a substrate. Electromagnetic wave shielding ability is slightly inferior to that of a conductive mesh type, but because of its excellent transparency, it is used as a display filter. It can be suitably used. In addition, for a transparent conductive film type optical filter, a configuration in which a low-resistance metal thin film layer and a transparent high-refractive-index thin film layer are alternately laminated is proposed for the purpose of maintaining transparency, reducing resistance, and improving durability. ing. Since the metal thin film layer also has a near-infrared shielding function at the same time, it is also suitable for this point as a display filter. Note that a metal thin film made of silver having a low specific resistance is preferably used for the metal thin film layer.

In general, an optical filter for a plasma display panel is generally provided with an antireflection function or an antiglare function on the surface thereof in order to enhance visibility.
For this, an antireflection film (AR film) or an antiglare film (AG film) is usually used. In addition, this optical filter has a toning that contains a dye in a part of its structure for the purpose of neutralizing the color of the object, improving the color temperature, expanding the color reproduction range, absorbing unnecessary light emission from the display, etc. Processing may be performed. Conventional plasma display panel optical filters are usually placed with a glass or resin plate on the front of the panel for the purpose of providing the functions described above and protecting the panel body,
A type in which various functional films are bonded on the board is used.

However, when such a front panel type filter is installed away from the panel display unit, the reflected image is doubled by the external light reflection on the display surface and the external light reflection on the front panel, and the visibility of the screen is increased. May be reduced. Further, the front plate type filter is a major obstacle to the reduction in thickness, weight, and cost of the plasma display panel. Therefore, it is necessary to remove the front plate and directly bond the optical filter film on the display panel as disclosed in JP-A-10-156991 and JP-A-10-1888.
22, 2000-98131.

[0009] The plasma display panel is an electric device, and in order to prevent the spread of fire in the event of a fire, it is strongly required that the member be made nonflammable. In a conventional front plate type filter, the entire filter is provided with flame retardancy by using glass or a resin plate material having flame retardancy for a substrate occupying an overwhelming volume. Therefore, the film to be bonded to the substrate is not particularly required to have flame retardancy, and members are selected mainly with emphasis on optical characteristics mainly on visibility and production cost. On the other hand, in a direct bonding type filter, since there is no substrate that contributes to the overall flame retardancy, the flame retardancy of the film used is important.

In general, an antireflection film for a display is preferably made of triacetylcellulose (TAC) as a base film material because of its high antireflection performance. It is difficult to do. In addition, a polyethylene terephthalate (PET) film is preferably used as the transparent polymer film having various functions in the application field of the present invention. When importance is placed on the property, some flame retarding treatment is required. Conventionally, halogenated flame retardants such as brominated flame retardants, which are excellent in cost performance, have been widely used for flame retardancy of transparent polymer films, but due to environmental impact and problems such as recycling. In the future, it is anticipated that regulations on substances used will be reviewed. Further, since the direct bonding type filter has no substrate, it is necessary to consider safety such as improvement of impact resistance against external force.

As described above, in the optical filter for direct bonding to the plasma display panel, unlike the conventional front plate type filter, it is necessary to conduct comprehensive selection evaluation including the flame retardancy of the film to be used. There is.

[0012]

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, an object of the present invention is to improve the practical safety in addition to the conventional function of shielding near infrared rays and electromagnetic waves generated from a plasma display panel. An object of the present invention is to provide a direct bonding type optical filter that can be used.

That is, the present invention relates to (1) an optical filter in which a transparent polymer film and an adhesive layer are alternately laminated by at least one each, and a lowermost layer is provided with an adhesive layer with a release film. An optical filter, characterized in that the burning duration of the transparent polymer film is less than 30 seconds in a vertical burning test specified in UL Standard 94, (2) a phosphorus-based compound or a hydrated metal compound as a main component. (1) an optical filter according to (1), wherein a transparent polymer film containing a flame retardant is used; (3) a phosphorus compound or (1) The optical filter according to (1) or (2), further comprising a flame retardant containing a hydrated metal compound as a main component, and (4) a transparent polymer film (A) having a functional transparent layer (E). When, The optical filter according to any one of (1) to (3), which has a configuration in which a transparent polymer film (B) having at least one of a near-infrared shielding function and an electromagnetic wave shielding function is laminated, and (5) a transparent function. Layer (E)
(A), a transparent polymer film (B) having at least one of a near-infrared shielding function and an electromagnetic wave shielding function, and a transparent polymer film (C) for raising the overall thickness. (1) The optical filter according to any one of (1) to (3), which has a laminated structure, and (6) has at least one of a near-infrared shielding function and an electromagnetic wave shielding function, and further has a function on a main surface of the film. A transparent polymer film (D) having a transparent layer (E) and a transparent polymer film (C) for raising the overall thickness are laminated.
(1) The optical filter according to any one of (1) to (3),
(7) The functional transparent layer (E) has an antireflection property, an antiglare property, a hard coat property, an antistatic property, an antifouling property, a gas barrier property, and UV.
The optical filter according to any one of (4) to (6), which has at least one function selected from cut properties.
(8) Transparent polymer films (B) and (D) having at least one of a near-infrared shielding function and an electromagnetic wave shielding function
A sheet resistance of 0.01 to 30 on at least one main surface of
The optical filter according to any one of (4) to (7), wherein a transparent conductive layer (F) of Ω / □ and an electrode (G) are formed. (9) The transparent conductive layer (F) is transparent. High refractive index thin film layer (a) and metal thin film layer made of silver or silver alloy (b)
And a / b / a,
a / b / a / b / a, a / b / a / b / a / b / a, a
/ B / a / b / a / b / a / b / a, wherein the optical filter according to (8), wherein (1)
0) at least one of the transparent high refractive index thin film layers (a) is
The optical filter according to (9), wherein the optical filter is made of an oxide mainly containing at least one of indium, tin, and zinc, and (11) a part or all of the transparent conductive layer (F). (8) The optical filter according to (8), wherein at least one of the transparent polymer film and the pressure-sensitive adhesive layer contains one dye.
(13) The optical filter according to any one of (1) to (11), which contains at least one species.
2) A plasma display panel in which the release film of the optical filter according to any of the above is peeled off and bonded to the front of the display unit. It is about.

[0014]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, all transparent polymer films constituting the optical filter have been produced by U.S. Pat.
By using a flame-retardant material having a combustion duration of less than 30 seconds in a vertical combustion test specified in L Standard 94,
The present inventors have found that practical safety can be achieved while maintaining the advantages of the direct-bonding type optical filter such as light weight and thinness and the effect of improving visibility.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below for each component. [Transparent polymer film] The material of the transparent polymer film used in the present invention is not particularly limited as long as it has flame retardancy and is transparent. Here, "flame retardant" refers to a material that satisfies the UL standard of 94 VTM-2 or higher. This UL standard is an American organization Unde
Specified by rwriters' Laboratories Inc. The test method is to wrap the sample film in a cylindrical shape, hold it vertically, and ignite the lower end. And the like to determine the flame retardancy. Further, the term "transparent" means that the wavelength is 400 to
It means that the light transmittance at 700 (nm) is 50 (%) or more.

Specific examples of the base material include:
Polyimide, polysulfone (PSF), polyethersulfone (PES), polyethylene terephthalate (PET), polymethylene methacrylate (PMM
A), polycarbonate (PC), polypropylene (P
P) and the like. Among them, polyethylene terephthalate (PET) is particularly preferably used.

As a method for making a film flame-retardant, (1) phosphorus, halogen or the like is added to polymer molecules;
A method of making the raw resin itself flame-retardant. (2) A method of adding various flame retardants to the raw material resin (3) A method of applying a flame retardant composition to the film surface, etc., but is not particularly limited thereto. Examples of the flame retardant include bromine-based flame retardants, chlorine-based flame retardants, phosphorus-based flame retardants, inorganic flame retardants using hydrated metals such as aluminum and magnesium, but are not particularly limited thereto. . However, it is preferable to use a phosphorus-based or hydrated metal-based flame retardant rather than a halogen-based flame retardant from the influence on the environment.

The thickness of the transparent polymer film is not particularly limited as long as it has a certain level of mechanical strength. However, for applications requiring high transparency, such as the application field of the present invention, the thickness is about 250 μm. Until is common. Also, if the thickness is 5
Since the strength is insufficient at 0 μm or less, the thickness of the transparent polymer film is 50 to 250 μm, preferably 75 to 20 μm.
0 μm is preferred. However, such as optical films
In applications where high transparency is important, generally a film of about 100 μm is often used. [Adhesive] The adhesive in the present invention is used for laminating a transparent polymer film and a transparent polymer film or laminating an optical filter to the display surface, and is preferably as transparent as possible. Here, being transparent means
The transmittance at a wavelength of 400 to 700 (nm) is 50
(%) Or more. Specific examples of usable adhesives include acrylic adhesives, silicone adhesives, urethane adhesives, polyvinyl butyral adhesives (PVB), and ethylene-vinyl acetate adhesives (EVA).
And so on. Above all, acrylic pressure-sensitive adhesives are particularly preferably used because of their excellent transparency and heat resistance.

In many cases, the adhesive contains a pigment for toning. The dye may be a general dye or pigment having a desired absorption wavelength in the visible region, and the type thereof is not particularly limited. For example, anthraquinone, phthalocyanine, methine, azomethine, oxazine,
Commonly available dyes such as azo, styryl, coumarin, porphyrin, dibenzofuranone, diketopyrrolopyrrole, rhodamine, xanthene, and pyrromethene are exemplified. The type and concentration are determined by the absorption wavelength and absorption coefficient of the dye, the color tone of the transparent conductive thin film layer, the transmission characteristics and transmittance required of the electromagnetic wave shield, and the type and thickness of the medium or coating film to be dispersed. It is not limited.

The form of the adhesive is roughly divided into a sheet-like material and a liquid-like material. The sheet-like pressure-sensitive adhesive is usually of a pressure-sensitive type, and after laminating the pressure-sensitive adhesive on one member to be pasted, the other member is further laminated to bond the two members together. The liquid adhesive is cured by leaving it at room temperature or heating after application and bonding. Examples of the method of applying the liquid adhesive include a bar coating method, a reverse coating method, a gravure coating method, and a roll coating method. It is selected in consideration of the type of material, viscosity, application amount, etc. Although the thickness of the adhesive is not particularly limited, it is 0.5 to 50 μm, preferably 1 to 3 μm.
0 μm. After bonding using an adhesive, degassing the bubbles that entered when bonding,
Curing may be performed under pressure and heating conditions in order to form a solid solution in the transparent adhesive material and further improve the adhesion between the members. At this time, the pressure condition is generally 0.0
The heating temperature is generally from room temperature to 80 ° C., although it depends on the heat resistance of each member.

Further, it is preferable that the pressure-sensitive adhesive itself used is also provided with flame retardancy. However, regarding the provision of flame retardancy, the adhesive strength, durability,
The impact on transparency needs to be considered. Further, similarly to the transparent polymer film, it is more preferable to use a non-halogen-based phosphorus-based or hydrated metal-based flame retardant. [Functional transparent layer] The functional transparent layer in the present invention has at least one function selected from antireflection properties, antiglare properties, hard coat properties, antistatic properties, antifouling properties, gas barrier properties, and UV cut properties. This may be a functional film formed by coating or printing or conventionally known various film forming methods, or a transparent substrate having the functional film. Further, one functional transparent layer may have a plurality of functions, or a plurality of functional transparent layers having each function may be laminated.

The anti-reflection property in the present invention is a function exhibited by forming an anti-reflection layer on a transparent polymer film, and the surface on which this is formed has a visible light reflectance of 0.1% or more. The performance is desirably 5% or less, preferably 0.1% or more and 3% or less. The visible light reflectance of the surface on which the anti-reflection film is formed can be reduced by sanding the opposite surface (the surface on which the anti-reflection layer is not formed) with sandpaper and eliminating the reflection on the opposite surface by black paint etc. It can be known by measuring reflected light generated only on the surface on which the layer is formed.

As the antireflection layer, specifically, a fluorine-based transparent polymer resin or magnesium fluoride having a refractive index of 1.5 or less, preferably 1.4 or less in the visible light region,
Silicon resin or silicon oxide thin film formed as a single layer with an optical thickness of, for example, 1/4 wavelength, metal oxides, fluorides, silicides, borides, carbide nitrides, sulfides having different refractive indices There are two or more thin films of an inorganic compound such as an organic compound or an organic compound such as a silicon-based resin, an acrylic resin, or a fluorine-based resin. Although a single layer is easy to manufacture, the antireflection property is inferior to that of a multilayer laminate. The multilayer laminate has an antireflection function over a wide wavelength range, and there is little restriction on optical design due to the optical characteristics of the base film. Sputtering, ion plating, ion beam assist,
A conventionally known method such as vacuum evaporation and a room-type coating method may be used.

The anti-glare property in the present invention is a function that is manifested by forming fine irregularities of about 0.1 to 10 μm on the surface of a transparent polymer film. , Silicon-based resins, melamine-based resins, urethane-based resins, alkyd-based resins, thermosetting or light-curing resins such as fluororesins, silica, melamine,
By coating and curing on a transparent polymer film by bar coating method, reverse coating method, gravure coating method, die coating method, roll coating method, etc., a dispersion of particles of an inorganic compound or organic compound such as acryl and made into an ink is applied. The method of forming is common. The average particle size of the particles is 1 to 40 μm. Further, a thermosetting or photocurable resin such as an acrylic resin, a silicon resin, a melamine resin, a urethane resin, an alkyd resin, or a fluorine resin is applied to the substrate, and a mold having a desired haze or surface state is provided. Can be hardened by pressing to obtain anti-glare properties. Furthermore, anti-glare properties can also be obtained by treating the base film with a chemical, such as etching a glass plate with hydrofluoric acid or the like. In this case, the haze can be controlled by the processing time and the etching property of the chemical. In the above-mentioned anti-glare film, it is only necessary that appropriate irregularities are formed on the surface, and the production method is not limited to the above-mentioned method. The haze of the antiglare film is from 0.5% to 20%, preferably 1%.
% Or more and 10% or less. If the haze is too small, the antiglare performance is insufficient, and if the haze is too large, the parallel light transmittance is reduced, and the visibility of the display deteriorates. This antiglare film can be used as an anti-Newton ring film in many cases.

The above-mentioned transparent polymer film having anti-reflection property or anti-glare property may be provided with a hard coat layer for the purpose of increasing the surface hardness or adhesion. As the hard coat layer material, an acrylate resin or a methacrylate resin is mainly used, but it is not particularly limited to this. In addition, an ultraviolet curing method or a polymerization transfer method is often used for forming the hard coat layer, but is not particularly limited thereto. In the polymerization transfer method, the target material is limited to a cell cast polymer such as a methacrylate resin. However, the hard coat layer can be formed with very high productivity by a continuous plate making method. For this reason, the formation of the methacrylate resin layer by the polymerization transfer method is the most suitably used method of forming a hard coat layer. The antireflection film and the antiglare film can be provided with functions such as antistatic properties, antifouling properties, gas barrier properties, and UV cut properties, in addition to the hard coat properties described above. [Near-Infrared Shielding Function] The near-infrared shielding function in the present invention is a function of shielding near-infrared rays emitted from the display surface to the outside of the device, particularly those in a wavelength range of 800 to 1100 nm. The method is broadly divided into two types: a method of including a near-infrared absorbing dye in a polymer film or an adhesive, and a method of forming a transparent conductive thin film including a metal reflective layer on a transparent polymer film. It does not matter which one.

[Electromagnetic Wave Shielding Function] In the present invention, the electromagnetic wave shielding function refers to a function of shielding electromagnetic waves emitted from the display surface to the outside of the device. The radiation surface is made of a highly conductive conductor, that is, a transparent conductive layer. It is a function that is revealed by covering. The transparent conductive layer can be roughly classified into two types, that is, a conductive mesh type and a transparent conductive film type. Either of them may be used. Since the conductive mesh type has a lower sheet resistance than that of the transparent conductive film, it is used for applications requiring particularly high electromagnetic wave shielding function. On the other hand, although the transparent conductive film type has an electromagnetic wave shielding function slightly inferior to the conductive mesh type, it also has a near-infrared shielding function at the same time, and thus is suitably used for an optical filter for a display.

[Transparent Conductive Film] The transparent conductive film of the present invention
The film is made of a transparent high refractive index thin film layer (a) and silver or a silver alloy.
A laminate with the metal thin film layer (b) made of
It has a function to block near infrared rays. Transparent high refractive index thin film layer
The material used in (a) should be as transparent as possible
Preferably, it is excellent. Excellent transparency here
Means that when a thin film having a thickness of about 100 nm is formed,
Transmittance of the thin film for light having a wavelength of 400 to 700 nm
Is 60% or more. In addition, high refractive index materials
Is a material having a refractive index of 1.4 or more for 550 nm light.
Fees. Suitable for transparent high refractive index thin film layer
Examples of possible materials include oxides of indium and tin.
(ITO), oxide of cadmium and tin (CTO),
Aluminum oxide (Al_TwoO_Three), Zinc oxide (Zn
O_Two), Oxides of zinc and aluminum (AZO), acids
Magnesium oxide (Mg0), thorium oxide (Th
0_Two), Tin oxide (SnO)_Two), Lanthanum oxide (La
O_Two), Silicon oxide (SiO_Two), Indium oxide (I
n_TwoO_Three), Niobium oxide (Nb_TwoO_Three), Antimony oxide
(Sb_TwoO_Three), Zirconium oxide (ZrO)_Two), Oxide
Cium (CeO)_Two), Titanium oxide (TiO)_Two), Bis oxide
Trout (Bio _Two). Also, transparent high refractive index sulfide
May be used. Specifically, zinc sulfide (Zn
S), cadmium sulfide (CdS), antimony sulfide (S
b_TwoS_Three) And the like. As a transparent high refractive index material,
Among them, ITO, TiO_Two, ZnO are particularly preferred. I
TO and ZnO_TwoHas conductivity and is in the visible range
Refractive index is as high as about 2.0, and almost in the visible region.
Almost no absorption. TiO_TwoIs an insulator and visible
Although it has a slight absorption in the region, the refractive index for visible light is
It is as large as about 2.3.

A thin film made of silver or a silver alloy is
Low specific resistance and excellent light transmission compared to metal thin films
Is preferably used. In particular, silver has a specific resistance of 1.59 ×
10 ^-6(Ω · cm), the most electric of all materials
Excellent conductivity and excellent visible light transmittance of thin film
Therefore, it is most preferably used. However, when silver is used as a thin film
Lacks stability and is susceptible to sulfidation and chlorination.
To improve stability, use silver instead of silver
And copper alloy or silver and palladium alloy or silver and platinum
May be used.

The transmittance of the transparent conductive film is preferably 40% or more and 99% or less, more preferably 50% or more and 99% or less.
Or less, more preferably 60% or more and 99% or less. A preferable surface resistance value is 0.2 (Ω / □).
Not less than 100 (Ω / □), preferably 0.2
(Ω / □) or more and 10 (Ω / □) or less, more preferably 0.2 (Ω / □) or more and 3 (Ω / □) or less, still more preferably 0.2 (Ω / □). 0.5 or more
(Ω / □) or less.

The transparent high refractive index thin film layer (a) and the metal thin film layer (b) made of silver or a silver alloy are alternately formed on a transparent polymer film as shown in the sectional views of FIGS. A transparent conductive film is obtained. As described above, usually, the transparent polymer film formed on the transparent polymer film is used, but the transparent polymer film forming the transparent conductive film is a film having an antireflection function or an antiglare function. There may be. The transparent transparent high refractive index thin film layer and the metal thin film layer made of silver or silver alloy may be formed by a conventionally known method such as a vacuum evaporation method, an ion plating method, and a sputtering method.

For forming a metal thin film layer made of silver or a silver alloy, a vacuum evaporation method or a sputtering method is suitably used. In the vacuum evaporation method, a metal thin film made of silver or a silver alloy can be easily formed by using a desired metal as an evaporation source and performing heating evaporation by resistance heating, electron beam heating, or the like. In addition, when using a sputtering method, using a desired metal material as a target, using an inert gas such as argon or neon as a sputtering gas, and using a direct current sputtering method or a high frequency sputtering method to be made of silver or a silver alloy. A metal thin film can be formed. In order to increase the deposition rate, a DC magnetron sputtering method or a high-frequency magnetron sputtering method is often used. The thicknesses of the transparent high refractive index thin film layer and the silver or silver alloy thin film layer are determined from the properties of the finally obtained transparent conductive thin film layer. Usually, the transparent high refractive index thin film layer has a thickness of about 5 to 100 (nm), and the silver or silver alloy thin film layer has a thickness of about 5 to 50 (nm).

The layer structure and the state of each layer of the optical filter manufactured by the above method were measured by an optical microscope on a cross section.
It can be examined using a scanning electron microscope (SEM) measurement and a transmission electron microscope measurement (TEM). The surface atomic composition of the thin film layer of the transparent conductive film is determined by Auger electron spectroscopy (AES), X-ray fluorescence (XRF), X-ray microanalysis (XMA), and charged particle excitation X-ray analysis (R
BS), X-ray photoelectron spectroscopy (XPS), vacuum ultraviolet photoelectron spectroscopy (UPS), infrared absorption spectroscopy (IR), Raman spectroscopy, secondary ion mass spectroscopy (SIMS), low energy ion scattering spectroscopy (ISS). Further, the atomic composition and the film thickness in the film can be examined by performing Auger electron spectroscopy (AES) or secondary ion mass spectrometry (SIMS) in the depth direction.

When an antiglare film, an antireflection film, or the like is bonded on the transparent conductive film, the film may be peeled off, and then examined by the above method. [Electrode] The electrode in the present invention is for extracting the electromagnetic wave absorbed by the transparent conductive layer to the outside as a current, and is obtained by bringing a conductive material into contact with the transparent conductive layer. The electrodes may be formed on the surface, may be formed on the cross section, and need not be particularly transparent as long as they are arranged so as to be electrically connected to the transparent conductive layer. . Although there is no particular limitation on the conductive material and form to be used, a method in which a paste-like material is applied and dried, or a metal tape is attached thereto is usually preferably used. A silver paste is generally used as the conductive paste, and a copper tape is generally used as the conductive tape. If you need adhesion,
A conductive particle such as silver or copper may be dispersed in an adhesive and used. Also, there is no particular designation as to where the electrodes are formed on the filter, and even on the entire outer periphery,
Only two sides facing each other may be used.

[Manufacturing Method] As a manufacturing method of the optical filter film in the present invention, it is common to bond transparent polymer films having various functions together with flame retardancy via an adhesive. For example, it can be easily manufactured by laminating an antireflection film or an antiglare film, a near-infrared shielding film, and an electromagnetic wave shielding film. Further, in order to improve the impact resistance, a transparent polymer film for raising the volume can be further attached to the surface of the antireflection film or the antiglare film opposite to the functional transparent layer. The bonding of the adhesive to the film and the bonding of the films through the adhesive are usually performed by a roll-to-roll method, but are not particularly limited to this method. It is also possible to laminate films sequentially. When the thickness of the entire film is 0.3 mm or more, winding on a roll is difficult due to its rigidity. Therefore, part of the film bonding process should be a single-wafer method. Is preferred.

The method for forming the electrode on the transparent conductive layer is not particularly specified, but various functional films are internally applied on the transparent conductive layer so that the transparent conductive layer is partially exposed, and the electrode is formed on the exposed portion. The forming method is suitably performed. Alternatively, a method in which a film in which a transparent conductive layer is formed on a transparent polymer film is prepared in a roll state, and an electrode is applied to an end portion in a process of feeding the film by roll-to-roll is also conceivable. In this case, if the electrodes are in a paste form, a normal roll coating method may be used, and if the electrodes are in a tape form, they may be bonded by a roll-to-roll method. By cutting a film having electrodes formed on both ends of a roll into a predetermined length, an optical filter having electrodes formed on two opposing sides of a rectangle can be manufactured. With such a configuration, since the electrodes can be formed by a roll-to-roll method or the electrodes can be formed in a roll state, an optical filter can be manufactured with extremely high production efficiency. Further, in addition to a portion other than the two opposing sides of the rectangle, an electrode may be formed in another portion, or a portion where the electrode is not formed may be present in a part of the two opposing sides.

[Optical Filter] The structure of the optical filter will be described with reference to the following drawings. 1 to 5 are sectional views showing an example of the optical filter for a plasma display panel according to the present invention. In FIG. 1, a transparent polymer film (B) 30 (100 μm) having flame retardancy and near-infrared shielding function is provided on a release film 10 and an adhesive layer 20.
m), an adhesive layer 20, a transparent polymer film (A) 40 (1) having an antiglare function and being a flame retardant and functional transparent layer (E).
(00 μm) are sequentially laminated. In FIG. 2, the release film 10, the adhesive layer 2
0, a polymer transparent film for raising (F) 50 (188 μm) having flame retardancy, a pressure-sensitive adhesive layer 20, a flame-retardant and reflection which is a functional transparent layer (E) on the main surface which is the outermost surface. Infrared shielding film (D) 60 (75μ)
m) are sequentially laminated.
In FIG. 3, on the release film 10 and the adhesive layer 20, a flame-retardant polymer transparent film for raising (C) is used.
50 (188 μm), adhesive layer 20, transparent polymer film (B) 30 (75) having flame retardancy and electromagnetic wave shielding function
μm), an adhesive layer 20, a transparent polymer film (A) 4 having an antireflection function, which is a flame-retardant and functional transparent layer (E) 4
0 (75 μm) are sequentially laminated. In FIG. 4, on the release film 10 and the adhesive layer 20, a transparent polymer film (C) 50 (188 μm) for raising the flammability, the adhesive layer 20, the flame retardancy and the electromagnetic wave shielding function are provided. Transparent polymer film (B) 30 (75 μm) having a certain transparent conductive layer (F), adhesive layer 2
0, a transparent polymer film (A) 40 (75 μm) having an antiglare function as a flame-retardant and functional transparent layer (E) is sequentially laminated, and an electrode 70 is arranged on the transparent polymer film (B). Optical filters are listed. In FIG. 5, on the release film 10 and the adhesive layer 20, a transparent polymer film (C) 50 (18)
8 μm), an adhesive layer 20, an electromagnetic wave shielding film (D) 60 (188 μm) having an anti-reflection function, which is a functional transparent layer (E), is sequentially laminated on the main surface which is a flame retardant and outermost surface, and is electromagnetically shielded. An optical filter in which an electrode 70 is disposed on a film is mentioned. FIG. 6 is a sectional view showing an example of the electromagnetic wave shielding film in the optical filter shown in FIG. In FIG. 6, a transparent conductive film is used as the transparent conductive layer (F), and the transparent high refractive index thin film layer (a) 8 is used.
0, the silver or silver alloy thin film layer (b) 90 is a / b / a / b
/ A, an example of a transparent conductive film laminated on the transparent polymer film 300 is given. FIG. 7 is a cross-sectional view showing an example of an electromagnetic wave shielding film having an antireflection function in the optical filter shown in FIG. In FIG. 7, a transparent conductive film is used as the transparent conductive layer (F), and the transparent high-refractive-index thin film layer (a) 80 and the silver or silver alloy thin film layer (b) 90 are a / b / a / b / a. / B / a, an example of a transparent conductive film laminated on the transparent polymer film 600 is given. An antireflection layer 100 is provided as a functional transparent layer (E) on the main surface on the opposite side of the film on which the transparent conductive film is formed. FIG. 8 is a plan view of the optical filter whose sectional views are shown in FIGS. The electrode 70 is formed on the outer peripheral portion of the optical filter 110, which is indicated by a thick line.

[0037]

Next, the present invention will be described in detail with reference to examples. Example 1 On one main surface of a polyethylene terephthalate film (Tetron O type, thickness: 100 μm) manufactured by Teijin Limited satisfying the VTM-2 condition of UL standard 94, an ITO thin film (film thickness: 40 nm) was formed in order from the film. Silver thin film (film thickness:
11 nm), ITO thin film (thickness: 95 nm), silver thin film (thickness: 14 nm), ITO thin film (thickness: 90 nm),
Silver thin film (thickness: 12 nm), ITO thin film (thickness: 40 n)
m) to form a total of seven transparent conductive films, and a sheet resistance of 2.2 Ω /
□ Transparent polymer film with electromagnetic wave shielding function (B)
Was prepared. An adhesive layer was formed on the above-mentioned electromagnetic wave shielding film by the following method. Ethyl acetate / toluene (5
(0:50 wt%) An organic dye was dispersed and dissolved in a solvent to obtain a diluent of an acrylic pressure-sensitive adhesive. The organic dye is a dye PD- manufactured by Mitsui Chemicals, which has an absorption maximum at a wavelength of 595 nm for absorbing unnecessary emission emitted by the plasma display.
319 and a red dye PS-Red-G manufactured by Mitsui Chemicals for correcting the chromaticity of white light emission were 1150 (wt) ppm and 1050 (wt) p in a dried adhesive material, respectively.
The acryl-based pressure-sensitive adhesive / dilution solution containing the dye was adjusted to contain pm. Acrylic adhesive / Dilution with dye (8
0:20 wt%), and coated with a comma coater to a dry film thickness of 25 μm on the surface of the electromagnetic wave shielding film side.
A release film was laminated on the dried and adhesive surface to form an adhesive layer. The transparent polymer film (B) having the electromagnetic wave shielding function with the dye-containing adhesive layer is 960 mm long.
It was cut to a size of 550 mm. Next, similarly to the above-mentioned electromagnetic wave shielding film, an anti-glare film is produced using a polyethylene terephthalate film (Tetron O type, thickness: 100 μm) manufactured by Teijin Limited which satisfies the VTM-2 condition of UL Standard 94. did. That is, a photopolymerization initiator is added to a polyfunctional methacrylate resin, and a coating liquid in which organic silica fine particles (average particle diameter: 15 μm) is dispersed is prepared. The coating liquid is continuously roll-to-roll on the main surface of the film. After coating, a UV-cured, transparent polymer film (A) having a functional transparent layer (E) having antiglare properties (haze value measured by a haze meter: 5%) and hard coat properties (pencil hardness: 2H) Was prepared. Further, using an ethyl acetate / toluene (50:50 wt%) solvent as a diluent, an acrylic adhesive and a diluent were mixed at a ratio of 80:20,
On the main surface opposite to the functional transparent layer (E), a 25 μm dry film thickness was applied by a comma coater, dried, and a release film was laminated to form a transparent adhesive layer. The transparent polymer film (A) having the functional transparent layer (E) with the transparent adhesive material is cut into a size of 920 mm in length × 510 mm in width, and is cut on a transparent polymer film (B) having an electromagnetic wave shielding function. Then, a film was applied so that the peripheral portion of the transparent conductive layer was exposed by 20 mm. Further, a silver paste (MSP-600F, manufactured by Mitsui Chemicals, Inc.) was applied to a region with a peripheral edge width of 22 mm so as to cover the exposed portion of the transparent conductive layer.
Was screen-printed and dried to form an electrode having a thickness of 15 μm. As a result, an optical filter was obtained in which all the materials of the used transparent polymer film had a combustion duration of less than 30 seconds in a vertical combustion test defined in UL Standard 94.

Example 2 On one main surface of a polyethylene terephthalate film (Tetron O type, thickness 75 μm) manufactured by Teijin Limited which satisfies the VTM-2 condition of UL standard 94, an ITO thin film (film thickness: 40 nm), silver thin film (film thickness: 1)
1 nm), ITO thin film (thickness: 95 nm), silver thin film (thickness: 14 nm), ITO thin film (thickness: 90 nm), silver thin film (thickness: 12 nm), ITO thin film (thickness: 40 nm)
The transparent polymer film (B) having a transparent conductive layer (F) having a sheet resistance of 2.2 Ω / □ was formed. On the other main surface of the transparent polymer film on which the transparent conductive layer was not formed, the next functional transparent layer was continuously formed by roll-to-roll. That is, a photopolymerization initiator is added to a polyfunctional methacrylate resin,
A coating liquid in which O fine particles (average particle diameter: 10 nm) is dispersed is applied by a gravure coater, and a conductive hard coat film (thickness: 3 μm) is formed by ultraviolet curing, and a fluorine-containing organic compound solution is formed thereon. Is coated with a microgravure coater, dried at 90 ° C., and thermally cured to form an antireflection film (thickness: 100 nm) having a refractive index of 1.4, hard coat properties (pencil hardness according to JIS K5400: 2H), and reflection. A functional transparent layer having antistatic properties (Rvis on the surface: 2.5%), antistatic properties (surface resistance: 7 × 10 ⁹ Ω / □), and antifouling properties was formed. Further, ethyl acetate / toluene (50: 5
0 wt%) Using a solvent as a diluent, an acrylic pressure-sensitive adhesive and a diluent were mixed at a ratio of 80:20, and coated on a transparent conductive layer surface with a comma coater to a dry film thickness of 25 μm.
After drying, the release film was laminated to form a transparent adhesive layer. This functional transparent layer and the transparent polymer film (D) having an electromagnetic wave function are 920 mm long × 510 mm wide.
Cut to dimensions. Furthermore, VTM-2 of UL standard 94
Teijin Limited polyethylene terephthalate film (Tetron O type, thickness 188μm)
An adhesive layer was formed on one of the main surfaces by the following method. The organic dye was dispersed and dissolved in a solvent of ethyl acetate / toluene (50:50 wt%) to obtain a diluted solution of an acrylic pressure-sensitive adhesive. The organic dye is a dye PD-319 manufactured by Mitsui Chemicals having an absorption maximum at a wavelength of 595 nm for absorbing unnecessary light emitted by a plasma display, and a red dye PS-manufactured by Mitsui Chemicals for correcting chromaticity of white light emission. Red-
G is 1150 (wt) p in each dried adhesive
The acryl-based pressure-sensitive adhesive / dilution-containing diluent was adjusted to contain 1050 (wt) ppm. Acrylic pressure-sensitive adhesive / dilution solution containing pigment (80:20 wt%) is mixed, coated with a comma coater to a dry film thickness of 25 μm on the electromagnetic wave shielding film side, dried, and a release film is laminated on the pressure-sensitive adhesive surface. Thus, an adhesive layer was formed. The raising transparent polymer film (C) having the dye-containing pressure-sensitive adhesive layer was applied to a length 9
The sheet was cut into a size of 20 mm x 510 mm in width, and the film was adhered on the transparent polymer film (B) having an electromagnetic wave shielding function so that the peripheral portion of the transparent conductive layer was exposed at 20 mm. Further, a silver paste (MSP-600F, manufactured by Mitsui Chemicals, Inc.) was screen-printed in a range of a peripheral portion width of 22 mm so as to cover the exposed portion of the transparent conductive layer, and dried to form an electrode having a thickness of 15 μm. Thereby, all the materials of the transparent polymer film to be used are UL standard 94
An optical filter having a combustion duration of less than 30 seconds in a vertical combustion test specified in Example 1 was obtained.

Example 3 A polyethylene terephthalate film (Tetron O type, thickness 75 μm) manufactured by Teijin Limited that satisfies the VTM-2 condition of UL standard 94 was formed on the main surface with a thickness of 7 μm and a hole diameter of 1 μm.
A copper foil having a thickness of 8 μm and a porosity of 8% was bonded using an acrylic adhesive. Next, a photoresist of an alkali development type is coated on the copper layer, exposed and developed using a photomask after prebaking, and a grid pattern having a grid width of 25 μm and an opening of 125 μm × 125 μm is provided on the transparent polymer film. Was. Further, etching of the resist unprotected copper foil portion with a ferric chloride solution and removal of the resist with an alkali solution were performed to prepare a conductive mesh film having an aperture ratio of 69%. The luminous average transmittance of this conductive mesh film was 65%, and the sheet resistance was 0.07Ω / □. Further, an adhesive layer was formed on the other main surface of the conductive mesh film where the mesh layer was not formed by the following method. Ethyl acetate / toluene (50: 50wt%)
An organic dye was dispersed and dissolved in a solvent to obtain a diluent of an acrylic pressure-sensitive adhesive. The organic dye is a dye PD-319 manufactured by Mitsui Chemicals having an absorption maximum at a wavelength of 595 nm for absorbing unnecessary light emitted by the plasma display, and a red dye PS-manufactured by Mitsui Chemicals for correcting chromaticity of white light emission.
Red-G, a near infrared absorbing dye manufactured by Mitsui Chemicals, Inc. S
Each of IR-128 and SIR-130 was dried at 1150 (wt) ppm and 1050 (wt) p in the adhesive.
pm, 3000 (wt) ppm, 3000 (wt) pp
The diluent containing the acrylic pressure-sensitive adhesive / dye was adjusted to contain m. Acrylic adhesive / Dilution containing dye (80:
20 wt%), and applied to the surface on the side of the electromagnetic wave shielding film to a dry film thickness of 25 μm using a comma coater, and then dried and laminated with a release film on the adhesive surface to form an adhesive layer. This transparent polymer film (B) having a transparent conductive layer with a dye-containing adhesive layer was 960 mm × 550 in length.
It was cut to the size of mm. Next, similarly to the above-mentioned conductive mesh film, an anti-reflection film is produced using a polyethylene terephthalate film (Tetron O type, thickness 75 μm) manufactured by Teijin Limited satisfying the VTM-2 condition of UL standard 94. did. That is, a photopolymerization initiator is added to a polyfunctional methacrylate resin,
A coating liquid in which O fine particles (average particle diameter: 10 nm) is dispersed is applied by a gravure coater, and a conductive hard coat film (thickness: 3 μm) is formed by ultraviolet curing, and a fluorine-containing organic compound solution is formed thereon. Is coated with a microgravure coater, dried at 90 ° C., and thermally cured to form an antireflection film (thickness: 100 nm) having a refractive index of 1.4, hard coat properties (pencil hardness according to JIS K5400: 2H), and reflection. Preparation of a transparent polymer film (A) having a functional transparent layer (E) having antistatic properties (Rvis on the surface: 2.5%), antistatic properties (surface resistance: 7 × 10 9 Ω / □), and antifouling properties did.
Further, using an ethyl acetate / toluene (50:50 wt%) solvent as a diluent, an acrylic pressure-sensitive adhesive and
The mixture was mixed at a ratio of 0:20, coated on the main surface opposite to the functional transparent layer (E) to a dry film thickness of 25 μm using a comma coater, dried, and a release film was laminated to form a transparent adhesive layer. Was formed. A transparent polymer film (A) having a functional transparent layer (E) with a transparent adhesive material was used to prepare a film having a length of 92 mm.
A transparent polymer film (B) cut into a size of 0 mm x 510 mm and having a transparent conductive layer made of a conductive mesh
A film was applied thereon such that the periphery of the transparent conductive layer was exposed at 20 mm. Further, on the opposite main surface of the transparent polymer film (B), a VTM-UL standard 94 of the same size (960 × 550 mm) as a raised film is used.
Teijin Limited polyethylene terephthalate film (Tetron O type, thickness 188μ)
m) and a transparent adhesive with a release film. In addition, a silver paste (Mitsui Chemical Co., Ltd., M) was used to cover the exposed portion of the transparent conductive layer in a range of a peripheral edge width of 22 mm.
SP-600F) is screen printed and dried to a thickness of 1
A 5 μm electrode was formed. As a result, an optical filter was obtained in which all the materials of the transparent polymer film used were less than 30 seconds in burning time in the vertical burning test specified in UL Standard 94.

Comparative Example 1 Polyethylene terephthalate pellets containing near infrared absorbing dyes, SIR-128 and SIR-13, manufactured by Mitsui Chemicals, Inc.
0.3 wt% each and melted at about 280 ° C.
Near-infrared shielding film with a thickness of 50 μm by axial stretching (B)
Was prepared. Since this film has not been subjected to treatment such as addition of a flame retardant, the burning continuation time is 30 seconds or more in a vertical combustion test defined by UL Standard 94, and the film does not have sufficient flame retardancy. Further, ethyl acetate / toluene (50: 5
0 wt%) Using a solvent as a diluent, an acrylic pressure-sensitive adhesive and a diluent were mixed at a ratio of 80:20, coated on a near-infrared shielding film surface with a comma coater to a dry film thickness of 25 μm, and dried. Then, an adhesive layer was formed, and a release film was laminated. On the near-infrared shielding film (B) produced as described above, an antireflection film (A) having triacetyl cellulose as a base film (thickness: 80 μm) was laminated (Rvis on the surface: 0.9%), Length 960mm ×
By cutting to a width of 550 mm, an optical filter was obtained in which none of the transparent polymer films used had flame retardancy.

COMPARATIVE EXAMPLE 2 A polyethylene terephthalate film (Tetron O type, thickness: 75 μm) manufactured by Teijin Limited satisfying the VTM-2 condition of UL Standard 94 was formed on one main surface of the thin film of ITO in order from the film. 40 nm), silver thin film (film thickness: 1)
1 nm), ITO thin film (thickness: 95 nm), silver thin film (thickness: 14 nm), ITO thin film (thickness: 90 nm), silver thin film (thickness: 12 nm), ITO thin film (thickness: 40 nm)
The transparent polymer film (B) having a transparent conductive layer (F) having a sheet resistance of 2.2 Ω / □ was formed. Further, ethyl acetate / toluene (50:50)
Acrylic adhesive and diluent are mixed at a ratio of 80:20 using a solvent as a diluent, and coated on a main surface opposite to the transparent conductive layer to a dry film thickness of 25 μm with a comma coater. After drying, a release film was laminated to form a transparent adhesive layer. A transparent polymer film (B) having a transparent conductive layer with an adhesive layer has a length of 960 mm × 550 mm.
Cut to dimensions. Next, an antireflection film (A) using triacetylcellulose shown in Comparative Example 1 as a base film (thickness: 80 μm) (Rvis on the surface: 0.9%)
Was cut into a size of 920 mm in length × 510 mm in width, and a film was adhered on a transparent polymer film (B) having a transparent conductive layer such that the peripheral portion of the transparent conductive layer was exposed at 20 mm. Further, a silver paste (MSP-600F manufactured by Mitsui Chemicals, Inc.) is screen-printed in a range of a peripheral portion width of 22 mm so as to cover the exposed portion of the transparent conductive layer,
After drying, an electrode having a thickness of 15 μm was formed. This allows
An optical filter was obtained in which some of the transparent polymer films used did not have flame retardancy. Made as above,
The following three tests were performed on the optical filters of Examples 1 to 3 and Comparative Examples 1 and 2.

(1) Evaluation of Reflection Characteristics The light-transmitting portion of the produced optical filter was cut into small pieces, and the total light reflectance of 400 to 800 nm was measured with a spectrophotometer (U-3400) of Hitachi, Ltd. The luminous average reflectance (Rvi
s). (2) Confirmation of visibility The prepared optical filter was used as a plasma display panel (PX-42VP1 manufactured by NEC).
It was directly bonded to the surface, and its visibility (visibility of the screen, presence or absence of influence of external light reflection, etc.) was confirmed from a distance of 1.5 m. (3) Vertical burning test The light-transmitting part of the prepared optical filter was cut out into small pieces of 5 inches x 8 inches, and UL was cut.
According to the 94VTM test, a vertical combustion test was conducted in which a small piece was wound in a cylindrical shape and held vertically to ignite from the lower end. In this test, the burning time accompanying the flame after the flame contact was confirmed, and 30
Those that took less than a second were passed, and those that were longer than that were rejected. The above test results are summarized in Table 1 below.

[Table 1]

[0043]

As is clear from Table 1 above, the luminous average reflectance measured by a spectrophotometer is the same as that of Comparative Example 1 using triacetylcellulose as the material of the antireflection film.
~ 2 is lower. However, in the visibility check directly bonded to the plasma display, an antireflection film using flame-retardant polyethylene terephthalate (Examples 2 to 5) was used.
No significant difference in performance from 3) was observed. Also,
Even when an antiglare film is used instead of the antireflection film as in Example 1, the numerical reflectivity is high,
Since the reflected light was scattered light, visibility was not significantly impaired. The point that no significant difference was observed in the visibility from the comparative example in the example was attributed to the effect that the reflection double image was greatly reduced by directly bonding the optical filter to the plasma display surface. Infer.

On the other hand, as is apparent from the results of the vertical burning test, the case where the transparent polymer film having no flame retardancy was used in all or a part as in Comparative Examples 1 and 2 and the case where Examples 1 to 3 were used. As described above, a significant difference was observed in the flammability between the case where a transparent polymer film having all flame retardancy was used for the optical filter. From the above results, in the optical filter for direct bonding, by defining all of the transparent polymer film constituting it as a flame retardant material, the safety is greatly improved without impairing the visibility. It became clear. According to the present invention, all the materials of the transparent polymer film constituting the optical filter are made of a flame-retardant material having a burning duration of less than 30 seconds in a vertical burning test specified by UL Standard 94, thereby directly attaching the film. It is possible to provide an optical filter that is excellent in safety while taking advantage of the combination type. Further, in order to improve the impact resistance of the optical filter for direct bonding, the thickness of the transparent polymer film may be increased or a film for raising the height may be provided. When further improvement in flame retardancy is required, a flame retardant may be added to the adhesive, and when considering the effect on the environment, non-flammable materials such as phosphorus-based and hydrated metal-based materials may be used. A halogen-based flame retardant may be used.

[Brief description of the drawings]

 1 to 5 are cross-sectional views illustrating an example of an optical filter. FIGS. 6 and 7 are cross-sectional views illustrating an example of a transparent conductive film. FIG. 8 is a plan view illustrating an example of an optical filter.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 10 release film 20 adhesive layer 30 transparent polymer film (B) 40 having at least one of flame retardancy and near infrared shielding function and electromagnetic wave shielding function 40 having flame retardant and functional transparent layer (E) Transparent polymer film (A) 50 Transparent polymer film for raising (F) having flame retardancy (C) 60 It has flame retardancy and at least one function of near-infrared shielding function and electromagnetic wave shielding function. Transparent polymer film (D) having functional transparent layer (E) on top 70 Electrode 80 Transparent high refractive index thin film layer (a) 90 Silver or silver alloy thin film layer (b) 300, 600 Flame retardant transparent polymer Film 100 anti-reflection layer 110 optical filter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/49 C08K 5/49 5C058 C08L 101/00 C08L 101/00 5G435 C09K 21/02 C09K 21/02 G02B 1/11 G02B 5/28 1/10 H04N 5/72 Z 5/28 G02B 1/10 A H04N 5/72 Z (72) Inventor Toshihisa Kitagawa 580-32 Nagaura, Sodegaura-shi, Chiba Mitsui Chemicals, Inc. 72) Inventor Shin Fukuda 580-32 Nagaura, Sodegaura-shi, Chiba Prefecture F-term in Mitsui Chemicals Co., Ltd. AA25E AA28E AA33E AB24E AK01A AK01C AR00B AR00D BA02 BA04 BA05 BA07 BA10A BA10B BA10C BA10D CA08B CA13 CB05 DC11E GB41 GB90 JD02A JD08A JD09A JD10A J G01E JG03A JJ07 JK12A JL06A JL13B JM02D JM02E JN01A JN01C JN01D JN06A JN18E 4H028 AA07 AA08 AA34 AB04 BA03 BA06 4J002 BB021 BG061 CF061 CG001 CM041 CN031 DA056 DE046 DH006 EW006 FD136 GF00 GP00 5C058 AA11 AB05 AB06 BA35 5G435 AA00 AA01 AA16 GG11 GG16 GG32 GG33 HH02 HH03 HH12 KK07

Claims (13)

[Claims] 1. An optical filter in which a transparent polymer film and an adhesive layer are alternately laminated at least one each, and an outermost layer is provided with an adhesive layer with a release film, which is defined by UL Standard 94. An optical filter characterized in that, in a vertical burning test performed, the burning duration of the transparent polymer film is less than 30 seconds. 2. The optical filter according to claim 1, wherein a transparent polymer film containing a flame retardant containing a phosphorus compound or a hydrated metal compound as a main component is used. 3. A flame retardant containing a phosphorus compound or a hydrated metal compound as a main component is added to at least one of the pressure-sensitive adhesives used in the laminated structure.
Or the optical filter of 2. 4. A structure in which a transparent polymer film (A) having a functional transparent layer (E) and a transparent polymer film (B) having at least one of a near-infrared shielding function and an electromagnetic wave shielding function are laminated. The optical filter according to any one of claims 1 to 3, comprising: 5. A transparent polymer film (A) having a functional transparent layer (E), a transparent polymer film (B) having at least one of a near-infrared shielding function and an electromagnetic wave shielding function, and an overall thickness The optical filter according to any one of claims 1 to 3, wherein the optical filter has a configuration in which a transparent polymer film (C) for raising a height is laminated. 6. A transparent polymer film (D) having at least one of a near-infrared shielding function and an electromagnetic wave shielding function, and further having a functional transparent layer (E) on the main surface of the film.
The optical filter according to any one of claims 1 to 3, wherein a transparent polymer film (C) for raising the overall thickness is laminated. 7. The functional transparent layer (E) has at least one function selected from the group consisting of antireflection properties, antiglare properties, hard coat properties, antistatic properties, antifouling properties, gas barrier properties, and UV cut properties. Item 7. The optical filter according to any one of Items 4 to 6. 8. The method according to claim 4, wherein at least one of the transparent polymer films has a transparent conductive layer (F) having a sheet resistance of 0.01 to 30 Ω / □ and an electrode (G).
An optical filter according to any one of claims 1 to 7. 9. The transparent conductive layer (F) is formed of a laminated structure of a transparent high-refractive-index thin film layer (a) and a metal thin film layer (b) made of silver or a silver alloy. / A, a
/ B / a / b / a, a / b / a / b / a / b / a, a /
The optical filter according to claim 8, wherein the optical filter is any one of b / a / b / a / b / a / b / a. 10. The method according to claim 9, wherein at least one of the transparent high-refractive-index thin film layers (a) is made of an oxide containing at least one of indium, tin and zinc as a main component. Optical filter. 11. The optical filter according to claim 8, wherein a part or all of the transparent conductive layer (F) is made of a conductive mesh. 12. The optical filter according to claim 1, wherein at least one of the transparent polymer film and the adhesive layer contains at least one dye. 13. A plasma display panel wherein the release film of the optical filter according to any one of claims 1 to 12 is peeled off and bonded to a front surface of a display unit.