JP2001074930A - Optical filter and antireflection film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical filter having a proper color correcting function by incorporating a specified fading inhibitor into a filter layer containing a dyestuff having its absorption maximum in a specified wavelength range and a polymer binder. SOLUTION: The optical filter has a filter layer 2 containing a dyestuff having its absorption maximum in the wavelength range of 560-620 nm and a polymer binder on a transparent substrate 1. The filter layer 2 further contains a fading inhibitor selected from the group comprising a phenol compound, a phenol ether compound, an aniline compound, a quinone compound and a piperidine compound. In the layer structure of the antireflection film with the filter layer 2 and an antreflection layer on the opposite sides of the transparent substrate 1, the filter layer 2, the substrate 1 and low refractive index layer 3 and successively laminated (a). The refractive index of the layer 3 is lower than that of the substrate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an optical filter having a transparent support and a filter layer. Also,
The present invention relates to a liquid crystal display (LCD), a plasma display panel (PDP), an electroluminescence display (ELD), a cathode ray tube display (CRT), a fluorescent display tube, and a surface of an image display device such as a field emission display. The present invention also relates to an antireflection film attached for antireflection or improving color reproducibility.

[0002]

2. Description of the Related Art A liquid crystal display (LCD), a plasma display panel (PDP), an electroluminescence display (ELD), a cathode ray tube display (CRT),
2. Description of the Related Art An image display device such as a fluorescent display tube or a field emission display displays a color image by a combination of light of three primary colors of red, blue and green in principle. However, it is very difficult (practically impossible) to make light for display ideal three primary colors. For example, in a plasma display panel (PDP), it is known that extra light (wavelength in the range of 560 to 620 nm) is included in light emission from the three primary color phosphors. Therefore, it has been proposed to perform color correction using an optical filter that absorbs light of a specific wavelength in order to correct the color balance of display colors. Japanese Patent Laid-Open No. 58-153 discloses color correction using an optical filter.
No. 904, No. 60-118748, No. 60-1874
No. 9, No. 61-188501, JP-A-3-23198
No. 8, No. 5-203804, No. 5-205564,
No. 7-307133, No. 9-145918, No. 9-
These are described in JP-A Nos. 306366 and 10-26704.

[0003] In addition to the color correction, the image display device also needs to prevent reflection. That is, the image display device has a problem that the contrast is reduced due to the background being reflected on the display. As a solution to this problem,
Various antireflection films have been proposed. The antireflection functional layers of the antireflection films proposed so far can be classified into vapor deposition layers and coating layers. Although the vapor deposition layer is superior from the viewpoint of optical functions, the coating layer has an advantage that it is easy to manufacture.
The vapor deposition layer has been used for a long time as an antireflection film for lenses such as glasses and cameras. The deposition layer is a vacuum deposition method,
It is formed by a sputtering method, an ion plating method, a CVD method or a PVD method. The coating layer is generally
It is formed by applying fine particles and a binder. Coating layers are described in JP-A-59-49501 and JP-A-59-50.
No. 401, 60-59250, JP-A-7-4852
No. 7 describes each.

It is also conceivable to incorporate an antireflection function into the optical filter. The above-mentioned JP-A-61-188.
No. 501, JP-A-5-205643 and 9-1459
No. 18, No. 9-306366, and No. 10-26704 disclose optical filters having an antireflection function incorporated therein. JP-A-61-188501, JP-A-5-205643, JP-A-9-145918 and JP-A-9-145918
In the optical filter described in each publication of 306366,
A dye or a pigment is added to the transparent support so that the support functions as a filter. JP-A-10-26704
In the optical filter described in the publication, a hard coat layer (surface hardened layer) provided between the transparent support and the antireflection layer
And the hard coat layer functions as a filter.

[0005]

If the transparent support or the hard coat layer is colored, the transparent support or the hard coat layer functions as a filter. However, the types of dyes that can be added to the transparent support and the hard coat layer are very limited. The transparent support is made from plastic or glass (usually plastic). The dye to be added to the transparent support is required to have a very high heat resistance enough to withstand the temperature during the production of the support. The hard coat layer is generally a layer containing a crosslinked polymer. The crosslinking reaction of the polymer is carried out after the application of the layer. Under the reaction conditions for crosslinking, there are many dyes that fade. It is difficult to perform appropriate color correction corresponding to an image display device only with a dye (limited in kind) that can be added to a transparent support or a hard coat layer.

The inventor of the present invention adds a dye to a polymer layer that can be formed under mild conditions, instead of a transparent support or a hard coat layer, which has many restrictions on the types of dyes that can be used, and makes the polymer layer function as a filter layer. Considered that. However, the polymer layer has a weaker dye protection function than the transparent support or the hard coat layer. In order to add a dye to the polymer layer, it is necessary to improve the durability (particularly light fastness) of the dye. An object of the present invention is to provide an optical filter having an appropriate color correction function. Another object of the present invention is to provide an antireflection film having an appropriate color correction function in addition to the antireflection function.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide the following optical filters (1) to (8) and the following (9):
This was achieved by the antireflection film of (10). (1) An optical filter having a filter layer containing a dye and a polymer binder on a transparent support,
The dye has an absorption maximum in a wavelength range of 560 to 620 nm, and the filter layer further contains an anti-fading agent selected from the group consisting of phenol compounds, phenol ether compounds, aniline compounds, quinone compounds and piperidine compounds. And optical filter. (2) The optical filter according to (1), wherein the filter layer contains the anti-fading agent in an amount ranging from 0.1 to 1000% by weight of the dye.

(3) The optical filter according to (1), wherein the dye is contained in the filter layer in an associated state. (4) The half width value of the absorption maximum of the dye is 10 to 120 nm
The optical filter according to (1), wherein (5) The optical filter according to (1), wherein the transmittance of the filter layer at the absorption maximum of the dye is 0.01 to 80%. (6) The optical filter according to (1), wherein the dye is a methine dye. (7) The optical filter according to (6), wherein the dye is a cyanine dye. (8) The optical filter according to (1), which is for a plasma display panel.

(9) A filter layer containing a dye and a polymer binder, a transparent support, and a low refractive index layer having a refractive index lower than that of the transparent support are the antireflection films laminated in this order. The dye has an absorption maximum in a wavelength region of 560 to 620 nm, and the filter layer further contains an anti-fading agent selected from the group consisting of phenol compounds, phenol ether compounds, aniline compounds, quinone compounds and piperidine compounds. An antireflection film characterized by the following. (10) An antireflection film in which a transparent support, a filter layer containing a dye and a polymer binder, and a low refractive index layer having a refractive index lower than that of the transparent support are laminated in this order, Is 560 to 620 nm
Wherein the filter layer further contains an anti-fading agent selected from the group consisting of phenol compounds, phenol ether compounds, aniline compounds, quinone compounds and piperidine compounds.

[0010]

According to the present invention, the present inventor has proceeded with research, and
A dye having a maximum absorption in a wavelength region of 0 nm, a phenol compound, a phenol ether compound, an aniline compound,
By using together with an anti-fading agent selected from the group consisting of a quinone compound and a piperidine compound, the dye is provided with light fastness which does not cause a problem even in an application of an optical filter or an antireflection film (always receiving strong light). Succeeded.
This has made it possible to use various dyes (for example, methine dyes developed in the field of silver halide photography) in the technical fields of optical filters and antireflection films. In the field of silver halide photography, the absorption spectral characteristics of dyes have also been studied in detail. By using such a dye, it is possible to perform an appropriate color correction function according to the type of the image display device. As a result, the optical filter and the antireflection film of the invention have an appropriate color correction function according to the type of the image display device.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical layer structure of an antireflection film (optical filter provided with an antireflection layer) will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing a layer configuration of an antireflection film in which a filter layer is provided on the side opposite to the transparent support from the antireflection layer. The embodiment shown in FIG. 1A includes a filter layer (2), a transparent support (1), and a low refractive index layer (3).
In the following order. The transparent support (1) and the low refractive index layer (3) have a refractive index satisfying the following relationship. The refractive index of the low refractive index layer <the refractive index of the transparent support In the embodiment shown in FIG. 1B, the filter layer (2), the transparent support (1), the hard coat layer (4), and the low refractive index layer ( It has a layer configuration in the order of 3). The embodiment shown in FIG. 1 (c) includes a filter layer (2), a transparent support (1), a hard coat layer (4), a high refractive index layer (5), and a low refractive index layer (3).
In the following order. The transparent support (1), the low refractive index layer (3) and the high refractive index layer (5) have a refractive index satisfying the following relationship. The refractive index of the low refractive index layer <the refractive index of the transparent support <the refractive index of the high refractive index layer In the embodiment shown in FIG. 1D, the filter layer (2), the transparent support (1), and the hard coat layer ( 4), a middle refractive index layer (6), a high refractive index layer (5), and a low refractive index layer (3). The transparent support (1), the low refractive index layer (3), the high refractive index layer (5) and the medium refractive index layer (6)
It has a refractive index satisfying the following relationship. Refractive index of low refractive index layer <refractive index of transparent support <refractive index of medium refractive index layer <refractive index of high refractive index layer

FIG. 2 is a schematic sectional view showing a layer structure of an antireflection film in which a filter layer and an antireflection layer are provided on the same side of a transparent support. The embodiment shown in FIG. 2A has a layer structure in the order of the transparent support (1), the filter layer (2), and the low refractive index layer (3). The relationship between the refractive index of the transparent support (1) and the refractive index of the low refractive index layer (3) is the same as that of FIG.
The embodiment shown in FIG. 2B has a layer structure in the order of the transparent support (1), the filter layer (2), the hard coat layer (4), and the low refractive index layer (3). The mode shown in FIG. 2C is a transparent support (1), a filter layer (2), a hard coat layer (4), a high refractive index layer (5), and a low refractive index layer (3).
In the following order. The relationship between the refractive indices of the transparent support (1), the low refractive index layer (3) and the high refractive index layer (5) is the same as that in FIG. The mode shown in FIG.
The transparent support (1), the filter layer (2), the hard coat layer (4), the medium refractive index layer (6), the high refractive index layer (5), and the low refractive index layer (3) have a layer structure in this order. . The relationship among the refractive indices of the transparent support (1), the low refractive index layer (3), the high refractive index layer (5) and the middle refractive index layer (6) is the same as that in FIG.

(Transparent Support) Examples of materials for forming the transparent support include cellulose esters (eg, diacetyl cellulose, triacetyl cellulose (TAC), propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, nitrocellulose). Polyamide, polycarbonate, polyester (eg, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, poly-1,4-cyclohexane dimethylene terephthalate, polyethylene-1,2-diphenoxyethane-4,4′-dicarboxylate, poly Butylene terephthalate), polystyrene (eg, syndiotactic polystyrene), polyolefin (eg, polyethylene, polypropylene, polymethylpentene), polymethylmethacrylate , Syndiotactic polystyrene, polysulfone, polyethersulfone, polyetherketone, polyetherimide and polyoxyethylene. Triacetyl cellulose, polycarbonate and polyethylene terephthalate are preferred. The transmittance of the transparent support is preferably 80% or more,
More preferably, it is 86% or more. Haze is 2
%, More preferably 1% or less. The refractive index is preferably from 1.45 to 1.70.

An infrared absorber or an ultraviolet absorber may be added to the transparent support. The amount of the infrared absorbing agent or the ultraviolet absorbing agent is 0.01 to 20% by weight of the transparent support.
And more preferably 0.05 to 10% by weight. Further, as a slipping agent, particles of an inert inorganic compound may be added to the transparent support. Examples of inorganic compounds include SiO ₂ , TiO ₂ , BaSO ₄ , Ca
Includes CO ₃ , talc and kaolin. The transparent support may be subjected to a surface treatment. Examples of the surface treatment include chemical treatment, mechanical treatment, corona discharge treatment, flame treatment, ultraviolet irradiation treatment, high frequency treatment, glow discharge treatment, active plasma treatment, laser treatment, mixed acid treatment and ozone oxidation treatment. Glow discharge treatment, ultraviolet irradiation treatment, corona discharge treatment and flame treatment are preferred, and glow discharge treatment and ultraviolet treatment are more preferred. Further, an undercoat layer for strengthening the adhesion with the upper layer may be provided.

(Filter layer) The thickness of the filter layer is preferably 0.1 μm to 5 cm,
More preferably, the thickness is from m to 100 μm. The filter layer contains an anti-fading agent, a dye and a polymer binder.

In the present invention, a phenol compound, a phenol ether compound, an aniline compound, a quinone compound or a piperidine compound is used as an anti-fading agent. In the present specification, the phenol compound means a compound having a phenolic hydroxyl group. The phenol ether compound means an ether in which a hydrogen atom of a phenolic hydroxyl group of the phenol compound is substituted by an aliphatic group or an aromatic group. An aniline compound means a compound having an amino-substituted benzene ring. Quinone compounds
It means a compound having a quinone ring (preferably a p-quinone ring). The piperidine compound means a compound having a piperidine ring.

Preferred phenol compounds and phenol ether compounds are represented by the following formula (I).

[0018]

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In the formula (I), R ¹ is a hydrogen atom, an aliphatic group or an aromatic group.

In the present specification, the aliphatic group is an alkyl
Group, substituted alkyl group, alkenyl group, substituted alkenyl
Group, alkynyl group, substituted alkynyl group, aralkyl group
Or a substituted aralkyl group. The alkyl group is cyclic
Or a chain. A chain alkyl group is
It may have a fork. The number of carbon atoms in the alkyl group is 1
From 20 to 20, preferably from 1 to 15
Is more preferable, and 1 to 12 is further preferable.
More preferably, 1 to 10.
Most preferably, it is from 8 to 8. Al of substituted alkyl group
The kill portion is the same as the above-mentioned alkyl group. Substituted alk
Examples of the substituent of the halogen group include a halogen atom, cyano, and nitro.
B, heterocyclic group, -OR³¹, -CO-R³², -CO-O
-R³³, -O-CO-R³⁴, -NR³⁵R³⁶, -NH-C
OR³⁷, -CO-NR³⁸R³⁹, -NH-CO-NR⁴⁰
R⁴¹, -NH-CO-OR⁴², -SR⁴³, -SO_Two
-R⁴⁴, -O-SO_Two-R⁴⁵, -NH-SO _Two-R⁴⁶You
And -SO_Two-NR⁴⁷R⁴⁸Is included. R³¹, R³², R
³³, R³⁴, R ³⁵, R³⁶, R³⁷, R³⁸, R³⁹, R⁴⁰,
R⁴¹, R⁴², R⁴³, R⁴⁴, R⁴⁵, R⁴⁶, R ⁴⁷And R⁴⁸
Are each independently a hydrogen atom, an aliphatic group, an aromatic group,
Or a heterocyclic group. In addition, -CO-OR³³R³³But
In the case of a hydrogen atom (ie, carboxyl) and -O
-SO_Two-R⁴⁵R⁴⁵Is a hydrogen atom (ie, sulfo)
In the case of, even if the hydrogen atom is dissociated,
You may.

The alkenyl group may be cyclic or chain. The chain alkenyl group may have a branch. The number of carbon atoms of the alkenyl group is preferably 2 to 20, more preferably 2 to 15, further preferably 2 to 12, and more preferably 2 to 1.
More preferably, it is 0, and most preferably 2 to 8. The alkenyl part of the substituted alkenyl group is the same as the above alkenyl group. Examples of the substituent of the substituted alkenyl group are the same as the examples of the substituent of the substituted alkyl group. The alkynyl group may be cyclic or chain. The chain alkynyl group may have a branch. The alkynyl group preferably has 2 to 20 carbon atoms, more preferably 2 to 15 carbon atoms,
It is more preferably from 2 to 12, still more preferably from 2 to 10, and most preferably from 2 to 8. The alkynyl part of the substituted alkynyl group is
The same as the above alkynyl group. Examples of the substituent of the substituted alkynyl group are the same as the examples of the substituent of the substituted alkyl group. The alkyl part of the aralkyl group is the same as the above-mentioned alkyl group. The aryl part of the aralkyl group is the same as the aryl group described later. The alkyl part of the substituted aralkyl group is the same as the above-mentioned alkyl group. The aryl part of the substituted aralkyl group is the same as the aryl group described later. Examples of substituents on the alkyl portion of the substituted aralkyl group include:
It is the same as the example of the substituent of the substituted alkyl group. Examples of the substituent of the aryl part of the substituted aralkyl group are the same as the examples of the substituent of the substituted aryl group described later.

In the present specification, the aromatic group means an aryl group or a substituted aryl group. The aryl group preferably has 6 to 25 carbon atoms, and has 6 to 2 carbon atoms.
It is more preferably 0, further preferably 6 to 15, and most preferably 6 (phenyl) or 10 (naphthyl). The aryl part of the substituted aryl group is the same as the above-mentioned aryl group. Examples of the substituent of the substituted aryl group include a halogen atom, cyano, nitro, an aliphatic group, an aromatic group, a heterocyclic group, -OR ⁵¹ , -C
OR- ⁵² , -CO-OR- ⁵³ , -O-CO- ^R54 , -N
^{R 55 R 56, -NH-CO} -R 57, -CO-NR 58 R 59,
—NH—CO—NR ⁶⁰ R ⁶¹ , —NH—CO—O—R ⁶² ,
_{^{-S-R 63, -SO 2 -R}} 64, -O-SO 2 -R 65, -
Is NH-SO ₂ -R ⁶⁶ or -SO ₂ -NR ⁶⁷ R ^68. R ⁵¹ , R ⁵² , R ⁵³ , R ⁵⁴ , R ⁵⁵ , R ⁵⁶ , R ⁵⁷ ,
^R58 , ^R59 , ^R60 , ^R61 , ^R62 , ^R63 , ^R64 , ^R65 , R
⁶⁶ , R ⁶⁷ and R ⁶⁸ are each independently a hydrogen atom, an aliphatic group, an aromatic group or a heterocyclic group. Note that -CO
R ⁵³ of -O-R ⁵³ is a hydrogen atom (i.e., carboxyl) For and -O-SO ₂ R ⁶⁵ of -R ⁶⁵ is a hydrogen atom (i.e., sulfo) in the case of, even if hydrogen atoms dissociated , May be in a salt state.

In the present specification, the heterocyclic group includes a heterocyclic group having a substituent. The heterocyclic ring of the heterocyclic group is preferably a 5- or 6-membered ring. An aliphatic ring, an aromatic ring, or another hetero ring may be condensed with the hetero ring.
Examples of the heterocycle (including a condensed ring) include a pyridine ring, a piperidine ring, a furan ring, a furfuran ring, a thiophene ring, a pyrrole ring, a quinolylmorpholine ring, a pyrrole ring, an indole ring, an imidazole ring, a pyrazole ring, and a quinoline ring. , Carbazole ring, phenothiazine ring, phenoxazine ring,
Includes indoline, thiazole, pyrazine, thiadiazine, benzoquinoline and thiadiazole rings. Examples of the substituent of the heterocyclic group are the same as the examples of the substituent of the substituted aryl group.

In the formula (I), n is 1, 2, 3, 4
Or 5. In the formula (I), R ² is a monovalent substituent of a benzene ring, or a plurality of R ² combine to form an aliphatic ring or an aromatic ring fused to the benzene ring. . Examples of the monovalent substituent of the benzene ring are the same as the examples of the substituent of the substituted aryl group. Examples of the aliphatic ring include a cyclopentene ring and a cyclohexene ring. Examples of the aromatic ring include a benzene ring and a naphthalene ring. The aliphatic ring and the aromatic ring may have a substituent. Examples of the substituent are the same as the examples of the substituent of the substituted aryl group.

A preferred aniline compound is represented by the following formula (II).

[0026]

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In the formula (II), R ³ and R ⁴ are each independently a hydrogen atom, an aliphatic group or an aromatic group, or R ³ and R ⁴ are bonded to form a heterocyclic ring. Or
Alternatively, R ³ or R ⁴ and R ⁵ combine to form a heterocyclic ring fused to a benzene ring. Examples of the heterocyclic ring formed by R ³ and R ⁴ include a pyrrolidine ring, a piperidine ring,
Includes piperazine and morpholine rings. Examples of the hetero ring formed by R ³ or R ⁴ and R ⁵ include a pyrroline ring and a tetrahydrodiazine ring.

In the formula (II), n is 1, 2, 3, 4
Or 5. In the formula (II), R ⁵ is a monovalent substituent of a benzene ring, or a plurality of R ⁵ combine to form an aliphatic ring or an aromatic ring fused to the benzene ring. . Examples of the monovalent substituent of the benzene ring are the same as the examples of the substituent of the substituted aryl group. Examples of the aliphatic ring include a cyclopentene ring and a cyclohexene ring. Examples of the aromatic ring include a benzene ring and a naphthalene ring. The aliphatic ring and the aromatic ring may have a substituent. Examples of the substituent are the same as the examples of the substituent of the substituted aryl group.

Preferred quinone compounds are represented by the following formula (III).

[0030]

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In the formula (III), m is 1, 2, 3 or 4. In the formula (III), R ⁶ is a monovalent substituent of a quinone ring, or a plurality of R ⁵ combine to form an aliphatic ring or an aromatic ring fused to the quinone ring. . Examples of the monovalent substituent of the quinone ring are the same as the examples of the substituent of the substituted aryl group. Examples of the aliphatic ring include a cyclopentene ring and a cyclohexene ring. Examples of the aromatic ring include a benzene ring and a naphthalene ring. The aliphatic ring and the aromatic ring may have a substituent. Examples of the substituent are the same as the examples of the substituent of the substituted aryl group.

A preferred piperidine compound is represented by the following formula (IV)
Expressed by

[0033]

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In the formula (IV), R ⁷ is a hydrogen atom, an aliphatic group or an oxygen radical. In the formula (IV),
R ⁹ , R ¹⁰ , R ¹¹ and R ⁹ are each independently a hydrogen atom or an aliphatic group.

The following are examples of phenol compounds, phenol ether compounds, aniline compounds, quinone compounds and piperidine compounds.

[0036]

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[0037]

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[0038]

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[0039]

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[0040]

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The above compounds include phenol, aniline,
It can be synthesized by performing a simple reaction such as an alkylation treatment on quinone or piperidine. Many of the above compounds are commercially available, and commercially available products may be used. Two or more anti-fading agents may be used in combination. The filter layer contains an anti-fading agent and 0.1 to 1 of dye.
Preferably in an amount in the range of 000% by weight, more preferably in an amount in the range of 5 to 500% by weight,
Most preferably, it is present in an amount ranging from 10 to 200% by weight.

The filter layer has an absorption maximum in a wavelength range of 560 to 620 nm (between green and red). The absorption maximum in the wavelength range of 560 to 620 nm has a function of selectively cutting the sub-band that reduces the color purity of the red phosphor. In the plasma display panel, unnecessary light emission near 595 nm emitted by excitation of neon gas can be cut. In order to further reduce the effect on the color tone of the green phosphor, the absorption maximum in the wavelength region of 560 to 620 nm is preferably sharp. Specifically, at the absorption maximum in the wavelength region of 560 to 620 nm, the half width value (the width of the wavelength region showing half the absorbance of the absorbance of the absorption maximum) is preferably 10 to 200 nm,
It is more preferably from 15 to 120 nm, further preferably from 20 to 100 nm, and from 22 to 8
Most preferably, it is 0 nm. 560 to 620n
The transmittance of the filter layer at the absorption maximum in the wavelength region of m is
It is preferably in the range of 0.01 to 80%,
More preferably, it is in the range of 1 to 60%.
Most preferably, it is in the range of 2 to 50%.

As the dye having an absorption maximum in the wavelength region of 560 to 620 nm, it is preferable to use a methine dye, an anthraquinone dye, a triphenylmethane dye, a xanthene dye, an azo dye or an azomethine dye. More preferably, a methine dye is used. Methine dyes can be classified into cyanine dyes, oxonol dyes, merocyanine dyes, arylidene dyes and styryl dyes. The cyanine dye, oxonol dye, merocyanine dye, arylidene dye and styryl dye are each represented by the following formula. Cyanine dye: Ba = Lo-Bo oxonol dye: Ak = Lo-Ae merocyanine dye: Ak = Le = Ba arylidene dye: Ak = Lo-Ar styryl dye: Bo-Le-Ar In the formula, Ba is a basic nucleus. Yes; Bo is an onium of a basic nucleus; Ak is a keto-type acidic nucleus;
Is an enol-type acidic nucleus; Ar is an aromatic nucleus; Lo is a methine chain consisting of an odd number of methines;
Le is a methine chain composed of an even number of methines.

Cyanine dyes are particularly preferred. Basic nucleus (Ba) of cyanine dye, onium body of basic nucleus (Bo)
The methine chain (Lo) composed of an odd number of methines will be further described. It is preferable that the basic nucleus (Ba) and the onium body (Bo) of the basic nucleus are each represented by the following formula.

[0045]

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Where X¹Is a single bond or -CR^Three= C
R^Four-And X¹Is a single bond, Y¹Is -O
-, -S-, -Se-, -NR^Five-, -CR⁶R⁷−
Or -CR⁸= CR⁹-And X¹Is -CR^Three= CR
^FourWhen-, Y¹Is a single bond; X^TwoIs a double
Bond or = CR^Ten-CR¹¹=; X^TwoBut double tie
If yes, Y^TwoIs -O-, -S-, -Se-,-
NR¹²-, -CR¹³R ¹⁴-Or -CR^Fifteen= CR¹⁶In
Yes; X^TwoIs = CR^Three-CR^Four=, Y^TwoIs
R is a single bond;¹And R^TwoAre each independently fat
An aliphatic group or an aromatic group;^Three, R^Four, R^Five,
R⁶, R⁷, R⁸, R⁹, R^Ten, R¹¹, R¹², R¹³, R
¹⁴, R^FifteenAnd R¹⁶Are each independently a hydrogen atom or
Is an aliphatic group; benzene rings A and B have other bases
The benzene ring may be fused; and the benzene ring
A, B and their fused rings may have a substituent
Good.

The benzene rings A and B and their condensed rings
Examples of the substituent include a hydrogen atom, a halogen atom, cyano,
Toro, aliphatic group, aromatic group, heterocyclic group, -OR^{twenty one}, −
CO-R^{twenty two}, -CO-OR^{twenty three}, -O-CO-R^{twenty four}, −
NR^{twenty five}R²⁶, -NH-CO-R²⁷, -CO-NR
²⁸R²⁹, -NH-CO-NR³⁰R³¹, -NH-CO-O
-R ³², -SR³³, -SO_Two-R³⁴, -O-SO_Two−
R³⁵, -NH-SO_Two-R³⁶Or -SO_Two-NR³⁷R
³⁸It is. R^{twenty one}, R^{twenty two}, R^{twenty three}, R^{twenty four}, R^{twenty five}, R²⁶,
R ²⁷, R²⁸, R²⁹, R³⁰, R³¹, R³², R³³, R³⁴, R
³⁵, R³⁶, R³⁷And R³⁸Are each independently a hydrogen source
, An aliphatic group, an aromatic group, or a heterocyclic group. In addition,
-CO-OR^{twenty three}R^{twenty three}Is a hydrogen atom (ie, carbo
Xyl) and -O-SO_Two-R³⁵R³⁵Is hydrogen
For an atom (ie, sulfo), the hydrogen atom dissociates
Or in a salt state.

The methine chain (Lo) of the cyanine dye is 1
Preferably consisting of 3, 3 or 5 methines,
It is particularly preferred that it consists of three methines. The methine chain may have a substituent. Examples of the substituent of the methine chain are the same as the examples of the substituent of the substituted aryl group. The two substituents of the methine chain may combine to form a 5- or 6-membered unsaturated aliphatic or heterocyclic ring. When the methine chain has one substituent, one substituent is preferably bonded to the central (meso) methine.

The cyanine dye may have an anion or a cation for maintaining charge balance. Examples of the cation include a proton, a metal ion and an ammonium ion. As the metal ion, an alkali metal ion (sodium ion, potassium ion, lithium ion) is preferable. The ammonium ion includes an organic ammonium ion (eg, tetramethylammonium, triethylammonium). Examples of the anion include a halogen ion (chlorine ion, bromine ion, iodine ion), p-toluenesulfon ion, ethyl sulfate ion, PF ₆ ⁻ , BF ₄ ⁻ and ClO ₄ ⁻ . Below, the example of a cyanine dye is shown.

[0050]

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[0051] _{(1) Ra: -CH 3,} Rb: -C 4 H 8 SO 3 - (2) Ra: -CH 3, Rb: -C 3 H 6 SO 3 - (3) Ra: -C 2 H _{5, Rb: -C 3 H 6} SO 3 - (4) Ra: -C 2 H 5, Rb: -C 4 H 8 SO 3 -

[0052]

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(5) Ra: —C ₄ H ₈ SO ₃ ⁻ , Rb: —C ₂ H ₅ (6) Ra: —C ₃ H ₆ SO ₃ ⁻ , Rb: —CH ₃ (7) Ra: —C ₂ H ₄ SO ₃ ⁻ , Rb: —C ₂ H ₅

[0054]

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[0055]

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[0056]

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[0057]

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[0058]

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[0059]

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The methine dye is available from FM Hammer (F.
M. Harmer), Heterocyclic Compounds
Heterocyclic Compounds-Cyanine Dyes and Related
Compounds), John Wiley and Sons, New York, London,
1964; DM Sturme
r), Heterocyclic Compounds-Special Topics in Het
erocyclic Chemistry) ", Chapter 18, Section 14, 482
515 pages, John Willie and Sons (John
Wiley and Sons), New York, London, 197
7 years; “Rodd's Chemistry of Carbon Compounds”
Second Edition, Volume 4, Part B, Chapter 15, 369-422
Page, Elsevier Science Publishing Company In
c.), New York, 1977;
The compounds can be synthesized with reference to the descriptions in JP-A Nos. 3 and 6-313939.

In the present invention, the dye is preferably used in an associated state. The dye in an associated state forms a so-called J band, and thus shows a sharp absorption spectrum peak. The dye association and the J band are described in the literature (eg,
Photographic Science and Engineering Vol. 18, No.
323-335 (1974)). Furthermore, the absorption maximum of the dye in the associated state moves to a longer wavelength side than the absorption maximum of the dye in the solution state. Therefore, whether the dye contained in the filter layer is in an associated state or a non-associated state can be easily determined by measuring the absorption maximum. In this specification, a state in which the absorption maximum moves to a longer wavelength side by 30 nm or more than the absorption maximum of the dye in a solution state is referred to as an association state. In the dye in the associated state, the movement of the absorption maximum is preferably 40 nm or more, more preferably 45 nm or more, and most preferably 50 nm or more.

Some dyes form compounds when dissolved only in water. However, generally, gelatin or a salt (eg, barium chloride, ammonium chloride, sodium chloride) is added to an aqueous solution of the dye to form an aggregate.
A method of adding gelatin to an aqueous solution of a dye is particularly preferred. Dye aggregates can also be formed as solid particulate dispersions of the dye. In order to obtain solid fine particles, a known disperser can be used. Examples of the disperser include a ball mill, a vibration mill, a planetary ball mill, a sand mill, a colloid mill, a jet mill and a roller mill. Vertical or horizontal media disperser (Japanese Patent Laid-Open No. 52-9 / 1982)
No. 2716 and International Patent Publication No. 88/074794) are preferred. Dispersion is accomplished by using a suitable medium (eg, water,
(Alcohol). It is preferable to use a surfactant for dispersion. Anionic surfactants (JP-A-52-92716 and International Patent No.
0774794) are preferably used. If necessary, an anionic polymer, a nonionic surfactant or a cationic surfactant may be used. After dissolving the dye in an appropriate solvent, the poor solvent may be added to obtain a fine powder. Also in this case, the above-mentioned surfactant can be used. Further, fine crystals of the dye may be precipitated by adjusting the pH of the solution. These microcrystals are also aggregates of the dye.

The filter layer has a wavelength range of 560 to 620 nm (between green and red) and a wavelength range of 500 to 550 nm.
It may have an absorption maximum in the wavelength region of m (green). 500
It is preferable that the half width of the absorption maximum in the wavelength range of 550 to 550 nm is wider than the half width of the absorption maximum in the wavelength range of 560 to 620 nm. Further, the transmittance of the filter layer at the absorption maximum in the wavelength region of 500 to 550 nm is preferably larger than the transmittance of the filter layer at the absorption maximum in the wavelength region of 560 to 620 nm.
The absorption maximum in the wavelength region of 500 to 550 nm has a function of adjusting the coloring intensity of the green phosphor having high visibility.
It is preferable that the emission region of the green phosphor be cut smoothly. Specifically, at the absorption maximum in the wavelength region of 500 to 550 nm, the half width value (the width of the wavelength region showing half the absorbance of the absorbance of the absorption maximum) is preferably 30 to 300 nm, and more preferably 40 to 250 nm. The thickness is more preferably 50 to 200 nm, and most preferably 60 to 150 nm. 5
The transmittance of the filter layer at the absorption maximum in the wavelength region of 00 to 550 nm is preferably in the range of 5 to 90%, more preferably 20 to 85%, and more preferably 5 to 90%.
Most preferably, it is in the range of 0 to 80%. 500
Oxonol dyes, azo dyes, azomethine dyes, as dyes having an absorption maximum in the wavelength region of from 550 nm to
Anthraquinone dye, cyanine dye, merocyanine dye, benzylidene dye or xanthene dye can be used. These dyes are

The wavelength range described above (500 to 550 nm)
And 560 to 620 nm). As such a dye, a near infrared absorbing dye can be used. As a near-infrared absorbing dye, a cyanine dye (JP-A-9-9689)
No. 1), metal chelate dyes, aminium dyes,
A diimonium dye, a quinone dye, a squarylium dye (described in JP-A-9-90547 and JP-A-10-204310) and various methine dyes can be used.
As for the near infrared absorbing dye, a coloring material, 61 [4] 215-
226 (1988) and Chemical Industries 43-53 (198).
May, 2006). Other visible light absorbing dyes include triphenylmethane dyes (US Pat.
No. 0695 and JP-A-5-117536) and fluorescein dyes (eg, fluorescein, dibromofluorescein, eosin, rhodamine)
Can be used.

As the polymer binder for the filter layer, natural polymers (eg, gelatin, cellulose derivatives,
Alginic acid) or a synthetic polymer (eg, polymethyl methacrylate, polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl chloride, styrene-butadiene copolymer, polystyrene, polycarbonate, water-soluble polyamide) can be used. Hydrophilic polymers (the above-mentioned natural polymers, polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl alcohol, and water-soluble polyamide) are preferred, and gelatin is particularly preferred.

To the filter layer, other anti-fading agents and ultraviolet absorbers may be added. Examples of the anti-fading agent functioning as a dye stabilizer include hydroquinone derivatives (described in US Pat. Nos. 3,935,016 and 3,982,944) and hydroquinone diether derivatives (US Pat. -21004
JP-A-54-145), phenol derivatives (JP-A-54-145)
No. 530), a derivative of spiroindane or methylenedioxybenzene (UK Patent Publication No. 2077455)
And JP-A-2062888 and JP-A-61-288.
No. 90155), chroman, spirochroman or coumaran derivatives (US Pat. Nos. 3,432,300, 3,573,050, 3,574,627, and 37643).
No. 37 and JP-A No. 52-152225,
Nos. 53-20327, 53-17729, and 61
-90156) and hydroquinone monoether or paraaminophenol derivatives (described in British Patent Nos. 1347556 and 2066975, and JP-B Nos. 54-12337 and JP-A-55-6321). And bisphenol derivatives (US Pat. No. 3,700,455 and JP-B-48-31625).
Publication No.).

In order to improve the stability of the dye to light or heat, a metal complex (described in US Pat. No. 4,245,018 and JP-A-60-97353) may be used as an anti-fading agent. In order to further improve the light fastness of the dye, a singlet oxygen quencher may be used as an anti-fading agent. Examples of the singlet oxygen quencher include a nitroso compound (described in JP-A-2-300288), a diimmonium compound (described in US Pat. No. 4,656,612), a nickel complex (described in JP-A-4-146189), and antioxidant. Agent (European Patent Publication 820057A1)
Description).

(Undercoat layer) It is preferable to provide an undercoat layer between the transparent support and the filter layer. The undercoat layer is formed as a layer containing a polymer having a glass transition temperature of −60 ° C. to 60 ° C., a layer having a rough surface on the filter layer side, or a layer containing a polymer having an affinity for the polymer of the filter layer. An undercoat layer is provided on the surface of the transparent support on which the filter layer is not provided to improve the adhesion between the transparent support and a layer provided thereon (for example, an antireflection layer or a hard coat layer). Is also good. The undercoat layer may be provided to improve the affinity between the adhesive for bonding the antireflection film and the image forming apparatus and the antireflection film. The thickness of the undercoat layer is preferably 2 nm to 20 μm, more preferably 5 nm to 5 μm, and most preferably 50 nm to 5 μm.

The undercoat layer containing a polymer having a glass transition temperature of -60 to 60 ° C. adheres the transparent support and the filter layer due to the tackiness of the polymer. Glass transition temperature 2
Polymers at 5 ° C or lower include vinyl chloride, vinylidene chloride,
It can be obtained by polymerization or copolymerization of vinyl acetate, butadiene, neoprene, styrene, chloroprene, acrylate, methacrylate, acrylonitrile or methyl vinyl ether. The glass transition temperature is preferably 20 ° C. or lower, more preferably 15 ° C. or lower, further preferably 10 ° C. or lower, still more preferably 5 ° C. or lower, and further preferably 0 ° C. or lower. Is most preferred. The undercoat layer having a rough surface adheres the transparent support and the filter layer by forming a filter layer on the rough surface. The undercoat layer having a rough surface can be easily formed by applying a polymer latex. The average particle size of the latex is preferably 0.02 to 3 μm,
More preferably, it is 5 to 1 μm. Examples of polymers having an affinity for the binder polymer of the filter layer include acrylic resins, cellulose derivatives, gelatin, casein, starch, polyvinyl alcohol, soluble nylon, and polymer latex. Two or more undercoat layers may be provided. The undercoat layer may contain a solvent for swelling the transparent support, a matting agent, a surfactant, an antistatic agent, a coating aid and a hardener.

(Anti-Reflection Layer) The anti-reflection function of the anti-reflection layer preferably has a regular reflectance of 3% or less.
More preferably, it is 1.8% or less. When providing an antireflection layer, a low refractive index layer is essential. The refractive index of the low refractive index layer is lower than the refractive index of the transparent support. The low refractive index layer preferably has a refractive index of 1.20 to 1.55, more preferably 1.30 to 1.55. The thickness of the low refractive index layer is preferably from 50 to 400 nm, more preferably from 50 to 200 nm. The low refractive index layer is a layer made of a fluorine-containing polymer having a low refractive index (Japanese Patent Application Laid-Open No. 57-34526,
No. 130103, No. 6-115023, No. 8-313
702, 7-168004), and a layer obtained by a sol-gel method (JP-A-5-208811,
JP-A-6-299091 and JP-A-7-168003) or a layer containing fine particles (JP-B-60-5925).
No. 0, JP-A-5-13021, JP-A-6-56478,
7-92306 and 9-288201). In the layer containing fine particles, voids can be formed in the low refractive index layer as microvoids between the fine particles or in the fine particles. The layer containing the fine particles preferably has a porosity of 3 to 50% by volume, more preferably 5 to 35% by volume.

In order to prevent reflection in a wide wavelength range,
It is preferable to laminate a layer having a high refractive index (middle / high refractive index layer) in addition to the low refractive index layer. The high refractive index layer preferably has a refractive index of 1.65 to 2.40.
More preferably, it is 70 to 2.20. The refractive index of the middle refractive index layer is adjusted to be an intermediate value between the refractive index of the low refractive index layer and the refractive index of the high refractive index layer. The refractive index of the middle refractive index layer is preferably from 1.50 to 1.90. The thickness of the middle / high refractive index layer is preferably from 5 nm to 100 μm, more preferably from 10 nm to 10 μm, and most preferably from 30 nm to 1 μm. The haze of the middle / high refractive index layer is preferably 5% or less, more preferably 3% or less, and most preferably 1% or less. The middle / high refractive index layer can be formed using a polymer binder having a relatively high refractive index. Examples of high refractive index polymers include polystyrene, styrene copolymers, polycarbonates, melamine resins, phenolic resins, epoxy resins, and polyurethanes obtained by reacting cyclic (alicyclic or aromatic) isocyanates with polyols. .
Other polymers having a cyclic (aromatic, heterocyclic, alicyclic) group and polymers having a halogen atom other than fluorine as a substituent also have a high refractive index. A polymer may be formed by a polymerization reaction of a monomer capable of radical curing by introducing a double bond.

In order to obtain a higher refractive index, inorganic fine particles may be dispersed in a polymer binder. The refractive index of the inorganic fine particles is preferably from 1.80 to 2.80. The inorganic fine particles are preferably formed from a metal oxide or sulfide. Examples of metal oxides or sulfides include titanium dioxide (eg, rutile, rutile / anatase mixed crystal, anatase, amorphous structure), tin oxide, indium oxide, zinc oxide, zirconium oxide, and zinc sulfide. Titanium oxide, tin oxide and indium oxide are particularly preferred. The inorganic fine particles contain oxides or sulfides of these metals as main components and may further contain other elements. The main component means a component having the largest content (% by weight) of the components constituting the particles. Examples of other elements include Ti, Zr, Sn, Sb, Cu, Fe, Mn,
Pb, Cd, As, Cr, Hg, Zn, Al, Mg, S
i, P and S are included. Inorganic materials that are film-forming and can be dispersed in solvents or are themselves liquid, such as alkoxides of various elements, salts of organic acids, coordination compounds (eg, chelate compounds) combined with coordination compounds, activity The middle / high refractive index layer can be formed using an inorganic polymer.

The anti-reflection layer can provide the surface with an anti-glare function (a function of scattering incident light on the surface to prevent a scene around the film from shifting to the film surface). For example, by forming fine irregularities on the surface of a transparent film, and forming an antireflection layer on the surface, or after forming the antireflection layer, by forming irregularities on the surface with an embossing roll, an anti-glare function is obtained. be able to.
An antireflection layer having an antiglare function generally has a haze of 3 to 30%.

[0074] The surface resistance of the layer having the (electromagnetic wave shielding layer) electromagnetic wave shielding effect is preferably 0.1 to 500 [Omega / m ^2, more preferably in the range of 0.1 to 10 [Omega / m ^2. Since it is a layer provided on an optical filter or an antireflection film, the electromagnetic wave shielding layer is preferably transparent. A layer generally known as a transparent conductive layer can be used as the electromagnetic wave shielding layer. As the transparent conductive layer, a metal thin film or a metal oxide thin film is preferably used. As the metal of the metal thin film, a noble metal is preferable,
Gold, silver, palladium or alloys thereof are preferred, and alloys of gold and silver are particularly preferred. The silver content in the alloy is
It is preferably at least 60% by weight. As the metal oxide of the metal oxide thin film, SnO ₂ , ZnO, ITO and In ₂ O ₃ are preferable. A metal thin film and a metal oxide thin film may be stacked. When both are laminated, the metal thin film can be protected (prevented from oxidation) by the metal oxide thin film, and the visible light transmittance can be increased. As the metal oxide to be laminated with the metal thin film, a divalent to tetravalent metal oxide (eg, zirconium oxide, titanium oxide, magnesium oxide, silicon oxide, aluminum oxide) is preferable. Also, a thin film of a metal alkoxide compound can be laminated with a metal thin film. The metal oxide or metal alkoxide compound thin film can be laminated on both sides of the metal thin film. When laminating on both sides of a metal thin film, different types of thin films may be used. The thickness of the metal thin film is preferably 4 to 40 nm, more preferably 5 to 35 nm, and most preferably 6 to 30 nm. The thickness of the metal oxide or metal alkoxide compound thin film is
It is preferably 20 to 300 nm, and 40 to 1 nm.
More preferably, it is 00 nm. The electromagnetic wave shielding layer can be formed by a sputtering method, a vacuum evaporation method, an ion plating method, a plasma CVD method, a plasma PVD method, or a coating of particles of metal or metal oxide.

(Infrared shielding layer)
It preferably has a shielding effect against near infrared rays having a wavelength of from about 1200 nm to 1200 nm. The infrared shielding layer can be formed of a resin mixture. Examples of the infrared shielding component in the resin mixture include copper (described in JP-A-6-118228), copper compounds and phosphorus compounds (JP-A-62-519).
No. 0), a copper compound or a thiourea compound (described in JP-A-6-73197) or a tungsten compound (described in U.S. Pat. No. 3,647,772). Instead of providing the infrared shielding layer, a resin mixture may be added to the transparent support. Note that the silver thin film described as the electromagnetic wave shielding layer also has an infrared shielding effect.

(Other Layers) The optical filter may be provided with a hard coat layer, a lubricating layer, an antifouling layer, an antistatic layer, an ultraviolet absorbing layer or an intermediate layer. The hard coat layer preferably contains a cross-linked polymer. The hard coat layer can be formed using an acrylic, urethane, or epoxy polymer, oligomer, or monomer (eg, an ultraviolet curable resin). The hard coat layer can also be formed from a silica-based material. A lubricating layer may be formed on the outermost surface of the optical filter. The lubricating layer has a function of imparting lubricity to the surface of the antireflection film and improving scratch resistance. The lubricating layer can be formed using polyorganosiloxane (eg, silicone oil), natural wax, petroleum wax, higher fatty acid metal salt, fluorine-based lubricant or a derivative thereof. The thickness of the lubrication layer is 2
It is preferably from 20 to 20 nm. The antifouling layer can be formed using a fluorine-containing polymer. The thickness of the antifouling layer is preferably from 2 to 100 nm, more preferably from 5 to 30 nm.

The anti-reflection layer (medium-refractive-index layer, high-refractive-index layer, low-refractive-index layer), filter layer, undercoat layer, hard coat layer, lubricating layer, and other layers are formed by a general coating method. Can be. Examples of the coating method include a dip coating method, an air knife coating method, a curtain coating method, a roller coating method, a wire bar coating method, a gravure coating method, and an extrusion coating method using a hopper (described in US Pat. No. 2,681,294). Is included. Two or more layers may be formed by simultaneous coating. The simultaneous coating method is described in U.S. Pat.
No. 41898, No. 3508947, No. 3526528
Issue specifications and Yuji Harazaki, "Coating Engineering" 2
It is described on page 53 (published by Asakura Shoten in 1973).

(Use of Optical Filter) The optical filter is applied to an image display device such as a liquid crystal display (LCD), a plasma display panel (PDP), an electroluminescence display (ELD), and a cathode ray tube display (CRT). . When the antireflection layer is provided, the antireflection layer is arranged so that the surface on which the low refractive index layer is not provided faces the image display surface of the image display device. When the optical filter of the present invention is used as an antireflection filter of a plasma display panel (PDP), a particularly remarkable effect is obtained. A plasma display panel (PDP) includes a gas, a glass substrate, an electrode, an electrode lead material, a thick film printing material, and a phosphor. There are two glass substrates, a front glass substrate and a rear glass substrate. An electrode and an insulating layer are formed on two glass substrates. A phosphor layer is further formed on the rear glass substrate. Two glass substrates are assembled, and gas is sealed between them. Plasma display panels (PDPs) are already commercially available. Regarding the plasma display panel, Japanese Patent Laid-Open No.
No. 43 and No. 9-306366.

[0079]

[Example 1] (Formation of undercoat layer) After a corona discharge treatment was applied to both sides of a transparent polyethylene terephthalate film having a thickness of 100 µm, a latex made of a styrene-butadiene copolymer was applied to one side to a thickness of 130 nm. Thus, an undercoat layer was formed.

(Formation of Second Undercoat Layer) On the undercoat layer,
A gelatin aqueous solution containing acetic acid and glutaraldehyde was applied to a thickness of 50 nm to form a second undercoat layer.

(Formation of Low Refractive Index Layer) Reactive Fluoropolymer (JN-7219, manufactured by Nippon Synthetic Rubber Co., Ltd.) 2.50
1.3 g of t-butanol was added to the resulting mixture, and the mixture was stirred at room temperature for 10 minutes and filtered with a polypropylene filter having a pore size of 1 μm. The obtained coating solution for a low refractive index layer is applied to the surface opposite to the undercoat surface of the transparent support using a bar coater so that the dry film thickness becomes 110 nm, and dried at 120 ° C. for 30 minutes. And cured to form a low refractive index layer.

(Formation of Filter Layer) In 180 g of a 10% by weight aqueous solution of gelatin, 0.05 g of the dye (1) and 0.05 g of the anti-fading agent (I-3) were dissolved.
After stirring for 30 minutes, the mixture was filtered through a polypropylene filter having a pore size of 2 μm to prepare a filter layer coating solution. The coating liquid for a filter layer was applied on the second undercoat layer so that the dry film thickness became 3.5 μm, and dried at 120 ° C. for 10 minutes to form a filter layer, thereby producing an optical filter.

(Measurement of Absorbance) The transmission spectrum of the prepared optical filter was measured using a spectrophotometer (U-3210, manufactured by Hitachi, Ltd.). Reference was made with air. The absorption maximum was 593 nm, the transmittance of the filter layer at the absorption maximum was 25%, and the half width of the absorption maximum was 35 nm.

Example 2 Example 1 was repeated except that the same amount of the anti-fading agent (I-7) was used in place of the anti-fading agent (I-3).
An optical filter was produced in the same manner as described above.

Example 3 Example 1 was repeated except that the same amount of the anti-fading agent (I-9) was used in place of the anti-fading agent (I-3).
An optical filter was produced in the same manner as described above.

Example 4 Example 1 was repeated except that the same amount of the anti-fading agent (II-6) was used in place of the anti-fading agent (I-3).
An optical filter was produced in the same manner as described above.

Example 5 Example 1 was repeated except that the same amount of the anti-fading agent (III-2) was used in place of the anti-fading agent (I-3).
An optical filter was produced in the same manner as described above.

Example 6 Example 1 was repeated except that the same amount of the anti-fading agent (IV-2) was used in place of the anti-fading agent (I-3).
An optical filter was produced in the same manner as described above.

Comparative Example 1 An optical filter was produced in the same manner as in Example 1 except that the anti-fading agent (I-3) was not added.

(Light fastness test) The produced optical filter was irradiated with light from the side opposite to the filter layer by a xenon lamp so that the illuminance was 150,000 lux.
The residual amount of the pigment (or dye) after the irradiation for 0 hours was measured. The residual amount was calculated according to the following equation. Residual amount = 100 × (100−transmittance after irradiation) / (10
0—Transmittance Before Irradiation) The transmittance is a value measured at the absorption maximum wavelength of the pigment (or dye).

(Moisture and Heat Resistance Test) The prepared optical filter was stored at a temperature of 60 ° C. and a relative humidity of 90% for one day, and the remaining amount of the dye was measured in the same manner as described above. Table 1 shows the above results.

[0092]

[Table 1] Table 1 ──────────────────────────────────── Optical filter Dye Anti-fading agent Absorption Maximum half width Light fastness 例 Example 1 (1) (I− 3) 593 nm 35 nm 91% Example 2 (1) (I-7) 593 nm 35 nm 95% Example 3 (1) (I-9) 594 nm 35 nm 93% Example 4 (1) (II-6) 594 nm 36 nm 94 % Example 5 (1) (III-2) 594 nm 36 nm 94% Example 6 (1) (IV-2) 593 nm 35 nm 93% Comparative example 1 (1) None 593 nm 35 nm 85% ──────── ────────────────────────────

When the optical filters of Examples 1 to 6 were attached to the surface of the plasma display panel, an image having good contrast was obtained, and white light and red light were improved.

Example 7 (Formation of Undercoat Layer) On one side of a transparent triacetyl cellulose film having a thickness of 80 μm, gelatin dispersed in methanol and acetone was applied so as to have a thickness of 200 nm, and dried. Was formed.

(Formation of Hard Coat Layer) 25 parts by weight of dipentaerythritol hexaacrylate (DPHA,
Nippon Kayaku Co., Ltd.), 25 parts by weight of a urethane acrylate oligomer (UV-6300B, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), 2 parts by weight of a photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy) and 0 5 parts by weight of a sensitizer (Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.)
It was dissolved in 0 parts by weight of methyl ethyl ketone. The obtained coating solution was applied to the surface opposite to the undercoat layer of the transparent support using a bar coater, dried, and then irradiated with ultraviolet rays to form a hard coat layer (layer thickness: 6 μm).

(Formation of Low Refractive Index Layer) A low refractive index layer was formed on the hard coat layer in the same manner as in Example 1 using a coating liquid for a low refractive index layer.

(Formation of Filter Layer) In 180 g of a 10% by weight aqueous solution of gelatin, 0.05 g of the dye (1) and 0.05 g of the antifading agent (I-3) were dissolved. Solution 40
After stirring at 30 ° C. for 30 minutes, the mixture was filtered through a polypropylene filter having a pore size of 2 μm to prepare a filter layer coating solution.
The coating liquid for a filter layer was applied on the undercoat layer so that the dry film thickness became 3.5 μm, and dried at 120 ° C. for 10 minutes to form a filter layer, thereby producing an optical filter. For the produced optical filter, when the transmittance and the half width at the absorption maximum and absorption maximum were measured,
The same result as that of the optical filter manufactured in Example 1 was obtained.

[Example 8] (Formation of undercoat layer) In the same manner as in Example 1, an undercoat layer (a) and a second undercoat layer (a) were formed on one surface of the transparent support. A latex made of vinylidene chloride-acrylic acid-methyl acrylate copolymer was applied to a thickness of 120 nm on the surface of the transparent support on which the undercoat layer was not provided, to form an undercoat layer (b).

(Formation of Second Undercoat Layer) On the undercoat layer (b), an acrylic latex (HA16, manufactured by Nippon Acrylic Co., Ltd.) was applied to a thickness of 50 nm to form a second undercoat layer (b). Was formed.

(Formation of Filter Layer) In 180 g of a 10% by weight aqueous solution of gelatin, 0.05 g of the dye (1) and 0.05 g of the anti-fading agent (I-3) were dissolved. Solution 40
After stirring at 30 ° C. for 30 minutes, the mixture was filtered through a polypropylene filter having a pore size of 2 μm to prepare a filter layer coating solution.
The coating solution for the filter layer is coated on the second undercoat layer (b),
Coating was performed so that the dry film thickness became 3.5 μm, and dried at 120 ° C. for 10 minutes to form a filter layer.

(Formation of Hard Coat Layer) A hard coat layer was formed on the filter layer in the same manner as in Example 7.

(Formation of Low-Refractive-Index Layer) A low-refractive-index layer was formed on the hard coat layer by using a coating solution for a low-refractive-index layer in the same manner as in Example 1, to produce an optical filter. With respect to the manufactured optical filter, when the absorption maximum and the transmittance and the half width at the absorption maximum were measured, the same result as the optical filter manufactured in Example 1 was obtained.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a layer configuration of an antireflection film in which a filter layer is provided on a side opposite to a transparent support from an antireflection layer.

FIG. 2 is a schematic cross-sectional view showing a layer configuration of an antireflection film in which a filter layer and an antireflection layer are provided on the same side of a transparent support. DESCRIPTION OF SYMBOLS 1 Transparent support 2 Filter layer 3 Low refractive index layer 4 Hard coat layer 5 High refractive index layer 6 Medium refractive index layer

Claims (10)

[Claims] 1. An optical filter having a filter layer containing a dye and a polymer binder on a transparent support, wherein the dye has an absorption maximum in a wavelength region of 560 to 620 nm, and the filter layer further comprises a phenol compound. An optical filter comprising a discoloration inhibitor selected from the group consisting of phenol ether compounds, aniline compounds, quinone compounds and piperidine compounds. 2. The optical filter according to claim 1, wherein the filter layer contains the anti-fading agent in an amount ranging from 0.1 to 1000% by weight of the dye. 3. The optical filter according to claim 1, wherein the dye is contained in the filter layer in an associated state. 4. The half-width value of the absorption maximum of the dye is 10 to 2
The optical filter according to claim 1, which has a thickness of 00 nm. 5. The optical filter according to claim 1, wherein the transmittance of the filter layer at the absorption maximum of the dye is 0.01 to 80%. 6. The optical filter according to claim 1, wherein the dye is a methine dye. 7. The optical filter according to claim 6, wherein the dye is a cyanine dye. 8. The optical filter according to claim 1, which is used for a plasma display panel. 9. An anti-reflection film comprising: a filter layer containing a dye and a polymer binder; a transparent support; and a low refractive index layer having a refractive index lower than that of the transparent support. The dye is 560 to 62
It has an absorption maximum in a wavelength region of 0 nm, and the filter layer has
Furthermore, phenol compounds, phenol ether compounds,
An anti-reflection film comprising an anti-fading agent selected from the group consisting of aniline compounds, quinone compounds and piperidine compounds. 10. An antireflection film comprising: a transparent support, a filter layer containing a dye and a polymer binder, and a low refractive index layer having a refractive index lower than that of the transparent support. The dye is 560 to 6
An anti-reflection film having an absorption maximum in a wavelength region of 20 nm, wherein the filter layer further contains an anti-fading agent selected from the group consisting of phenol compounds, phenol ether compounds, aniline compounds, quinone compounds and piperidine compounds. .