JP2023103867A - Colored layer forming composition, optical film and display device - Google Patents

Abstract

To provide a colored layer forming composition that allows for improved light resistance and heat resistance, strikes a balance between antireflective property and brightness efficiency, and also enables improved display quality, an extended life of light emitting devices, and improved color reproduction.SOLUTION: A colored layer forming composition contains a dye (A) and an active energy-ray curable resin (B). The dye (A) contains a first colorant and a second colorant. The first colorant has a maximum absorption wavelength of 470-530 nm and a half-width of an absorption spectrum of 15-45 nm, while the second colorant has a maximum absorption wavelength of 560-620 nm and a half-width of the absorption spectrum of 15-55 nm. The active energy-ray curable resin (B) contains a copolymer including a structural unit having any of a (meth)acrylate repeat unit, an olefinic repeat unit, a halogen atom-containing repeat unit, a styrenic repeat unit, a vinyl acetate repeat unit, and a vinyl alcoholic repeat unit.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a composition for forming a colored layer, an optical film and a display device.

2. Description of the Related Art A display device is often used in an environment where external light is incident regardless of whether it is indoors or outdoors. External light incident on the display device is reflected on the surface of the display device, causing deterioration in display quality. Among them, self-luminous display devices such as organic light-emitting display devices have the problem that the electrodes and many other metal wiring strongly reflect external light, and the display quality tends to deteriorate. It is expected to be a next-generation display device because it has high-quality characteristics such as brightness and high reaction speed.

In order to solve the problem of deterioration in display quality due to reflection of external light, there is a configuration in which a polarizing plate and a phase delay plate are arranged on the display surface side to suppress reflection of external light.
However, in the method using the polarizing plate and the phase retarding plate, when the light emitted from the display device passes through the polarizing plate and the phase retarding plate and is emitted to the outside, a considerable portion of the light is lost, and the life of the device is shortened. was likely to lead to a decrease in

Further, in general, display devices are required to have high color purity. Color purity indicates the range of colors that can be displayed by a display device, and is also called color reproduction range. Therefore, high color purity means a wide color reproduction range and good color reproducibility. As means for improving color reproducibility, there is a method of separating colors by using a color filter for a light source that emits white light, or a method of correcting a light source that emits monochromatic light of the three primary colors RGB with a color filter and narrowing the half value. Are known. However, in order to improve the color reproducibility of a display device using a color filter, it is necessary to increase the thickness of the color filter and increase the concentration of the coloring material, which may deteriorate the pixel shape and viewing angle characteristics, resulting in deterioration of the display quality. I had a problem getting it down. Further, a display device that emits monochromatic light of the three primary colors, RGB, requires a color filter forming process, which causes a problem of increased cost.

As a display device different from the configuration in which a polarizing plate and a phase retardation plate are arranged or the configuration in which a color filter is used, for example, Patent Document 1 discloses a display substrate including an organic light-emitting element and a seal spaced apart from the display substrate. and a sealing substrate, and a space between the display substrate and the sealing substrate is filled with a filler that selectively absorbs external light for each wavelength band and adjusts transmittance. It is According to the invention of Patent Document 1, visibility is improved by suppressing external light reflection, and light in a wavelength band that particularly reduces color purity among light emitted from the display device is selectively absorbed. Color purity is also improved.

Japanese Patent No. 5673713

However, the dye having selective absorption as used in the technique of Patent Document 1 is poor in light resistance, heat resistance, etc., and is insufficient as a structure to ensure reliability. was difficult.

Based on the above circumstances, the present invention provides a coloring that can improve light resistance and heat resistance, can achieve both reflection suppression and luminance efficiency, can improve display quality, can extend the life of light emitting elements, and can improve color reproducibility. Layer-forming compositions, optical films, and display devices are provided.

The present invention has the following aspects.

［式（１）において、Ｒ^１は、水素原子、ハロゲン原子、カルボキシル基、スルホ基、シアノ基、ヒドロキシ基、炭素数１０以下のアルキル基、炭素数１０以下のアルコキシカルボニル基、炭素数１０以下のアルキルスルホニルアミノカルボニル基、アリールスルホニルアミノカルボニル基、アルキルスルホニル基、アリールスルホニル基、炭素数１０以下のアシルアミノスルホニル基、炭素数１０以下のアルコキシ基、炭素数１０以下のアルキルチオ基、炭素数１０以下のアリールオキシ基、ニトロ基、アルコキシカルボニルオキシ基、アリールオキシカルボニルオキシ基、炭素数１０以下のアシルオキシ基、炭素数１０以下のアシル基、カルバモイル基、スルファモイル基、炭素数１０以下のアリール基、置換アミノ基、置換ウレイド基、置換ホスホノ基、又は複素環基を表し、Ｒ^２は、水素原子又は炭素数３０以下のアルキル基を表し、Ｘは、単結合、エステル基、炭素数３０以下の脂肪族アルキル鎖、芳香族鎖、ポリエチレングリコール鎖、又はこれらを組み合わせてなる連結基を表し、いずれもスピロジオキサン環を含んでもよい。］ [1] Contains a dye (A), an active energy ray-curable resin (B), a photopolymerization initiator (C), and a solvent (D), wherein the dye (A) is the first color and a second coloring material, wherein the first coloring material has a maximum absorption wavelength in the range of 470 to 530 nm, a half width of an absorption spectrum of 15 to 45 nm, and the second coloring material. The coloring material has a maximum absorption wavelength in the range of 560 to 620 nm and a half width of the absorption spectrum of 15 to 55 nm, and the active energy ray-curable resin (B) is represented by the following formula (1). Structural units and structural units having any of (meth)acrylate repeating units, olefin repeating units, halogen atom-containing repeating units, styrene repeating units, vinyl acetate repeating units, and vinyl alcohol repeating units A composition for forming a colored layer containing a polymer.

[In formula (1), R ¹ is a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, and a alkylsulfonylaminocarbonyl group, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 carbon atoms or less, alkoxy group having 10 carbon atoms or less, alkylthio group having 10 carbon atoms or less, 10 carbon atoms The following aryloxy group, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 carbon atoms or less, acyl group having 10 carbon atoms or less, carbamoyl group, sulfamoyl group, aryl group having 10 carbon atoms or less, represents a substituted amino group, a substituted ureido group, a substituted phosphono group, or a heterocyclic group; R ² represents a hydrogen atom or an alkyl group having 30 or less carbon atoms; X is a single bond, an ester group, or a It represents an aliphatic alkyl chain, an aromatic chain, a polyethylene glycol chain, or a linking group formed by combining these chains, any of which may contain a spirodioxane ring. ]

［式（２）において、Ｒ^３は、水素原子、ハロゲン原子、カルボキシル基、スルホ基、シアノ基、ヒドロキシ基、炭素数１０以下のアルキル基、炭素数１０以下のアルコキシカルボニル基、炭素数１０以下のアルキルスルホニルアミノカルボニル基、アリールスルホニルアミノカルボニル基、アルキルスルホニル基、アリールスルホニル基、炭素数１０以下のアシルアミノスルホニル基、炭素数１０以下のアルコキシ基、炭素数１０以下のアルキルチオ基、炭素数１０以下のアリールオキシ基、ニトロ基、アルコキシカルボニルオキシ基、アリールオキシカルボニルオキシ基、炭素数１０以下のアシルオキシ基、炭素数１０以下のアシル基、カルバモイル基、スルファモイル基、炭素数１０以下のアリール基、置換アミノ基、置換ウレイド基、置換ホスホノ基、又は複素環基を表し、Ｒ^４は、水素原子又は炭素数３０以下のアルキル基を表し、Ｘは、単結合、エステル基、炭素数３０以下の脂肪族アルキル鎖、芳香族鎖、ポリエチレングリコール鎖、又はこれらを組み合わせてなる連結基を表し、いずれもスピロジオキサン環を含んでもよい。］ [2] The composition for forming a colored layer according to [1], wherein the active energy ray-curable resin (B) contains a polymer containing a structural unit represented by the following formula (2).

[In formula (2), R ³ is a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, and a alkylsulfonylaminocarbonyl group, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 carbon atoms or less, alkoxy group having 10 carbon atoms or less, alkylthio group having 10 carbon atoms or less, 10 carbon atoms The following aryloxy group, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 carbon atoms or less, acyl group having 10 carbon atoms or less, carbamoyl group, sulfamoyl group, aryl group having 10 carbon atoms or less, represents a substituted amino group, a substituted ureido group, a substituted phosphono group, or a heterocyclic group; R ⁴ represents a hydrogen atom or an alkyl group having 30 or less carbon atoms; X is a single bond, an ester group, or a It represents an aliphatic alkyl chain, an aromatic chain, a polyethylene glycol chain, or a linking group formed by combining these chains, any of which may contain a spirodioxane ring. ]

[3] The polymer containing the structural unit represented by the formula (2) includes the structural unit represented by the formula (2), a (meth)acrylate repeating unit, an olefin repeating unit, and a halogen atom-containing repeating unit. , a styrene-based repeating unit, a vinyl acetate-based repeating unit, or a vinyl alcohol-based repeating unit.

[4] The composition according to any one of [1] to [3], further containing one or more additives (E) selected from radical scavengers, peroxide decomposers and singlet oxygen quenchers. A composition for forming a colored layer.
[5] The composition for forming a colored layer according to [4], wherein the singlet oxygen quencher is a dialkyl phosphate, a dialkyldithiocarbanate, a benzenedithiol, or a transition metal complex thereof.
[6] The dye (A) has a porphyrin structure, a merocyanine structure, a phthalocyanine structure, an azo structure, a cyanine structure, a squarylium structure, a coumarin structure, a polyene structure, a quinone structure, a tetradiporphyrin structure, a pyrromethene structure, or an indigo structure. The composition for forming a colored layer according to any one of [1] to [5], comprising one or more compounds selected from the group consisting of compounds having and metal complexes thereof.
[7] The dye (A) further contains a third coloring material whose transmittance is lowest in the wavelength range of 380 to 780 nm in the range of 650 to 780 nm, [1] to [6] The composition for forming a colored layer according to any one of the above.

[8] A colored layer that is a cured product of the colored layer-forming composition according to any one of [1] to [7], a transparent substrate located on one side of the colored layer, and the colored layer and a functional layer located on one or the other surface, wherein one or both of the transparent substrate and the functional layer has an ultraviolet shielding rate of 85% or more measured according to the method described in JIS L1925. An optical film, wherein the functional layer functions as an antireflection layer or an antiglare layer.
[9] The optical film of [8], further comprising, as the functional layer, an oxygen barrier layer having an oxygen permeability of 10 cm ³ /(m ² ·day·atm) or less.
[10] The optical film of [8] or [9], further comprising an antistatic layer or an antifouling layer as the functional layer.

[11] A display device comprising the optical film according to any one of [8] to [10].

According to the present invention, a composition for forming a colored layer can improve light resistance and heat resistance, achieve both reflection suppression and luminance efficiency, improve display quality, extend the life of light-emitting elements, and improve color reproducibility. objects, optical films and display devices.

1 is a cross-sectional view of an optical film according to one embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view of an optical film according to another embodiment of the invention; FIG. 4 is a cross-sectional view of an optical film according to another embodiment of the invention; FIG. 4 is a cross-sectional view of an optical film according to another embodiment of the invention; FIG. 4 is a cross-sectional view of an optical film according to another embodiment of the invention; FIG. 4 is a cross-sectional view of an optical film according to another embodiment of the invention; FIG. 4 is a cross-sectional view of an optical film according to another embodiment of the invention; FIG. 4 is a cross-sectional view of an optical film according to another embodiment of the invention; 4 is a graph showing a spectrum of white display output through an organic EL light source and a color filter in an example. 4 is a graph of each spectrum during red display, green display, and blue display output through an organic EL light source and a color filter in an example.

Embodiments of the present invention are described below with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding members are denoted by the same reference numerals, and common explanations are omitted.

[Optical film]
An optical film according to one embodiment of the present invention will be described in detail below with reference to FIG.

As shown in FIG. 1, the optical film 1 has a colored layer 10, a transparent substrate 20, and a functional layer 30. As shown in FIG. The functional layer 30 has a low refractive index layer 31 and a hard coat layer 32 . That is, the optical film 1 has a transparent substrate 20 located on one side of the colored layer 10, and the colored layer 10, the transparent substrate 20, the hard coat layer 32, and the low refractive index layer 31 are laminated in this order. It is a laminated body.

The thickness of the optical film 1 is, for example, preferably 10 to 140 μm, more preferably 15 to 120 μm, even more preferably 20 to 100 μm. The intensity|strength of the optical film 1 can be improved more as the thickness of the optical film 1 is more than the said lower limit. When the thickness of the optical film 1 is equal to or less than the above upper limit, not only can the optical film 1 be made lighter, but it is also advantageous for thinning the display device.
Each layer constituting the optical film 1 will be described below.

≪Colored layer≫
The colored layer 10 is a cured product of the colored layer-forming composition of the present invention. The colored layer-forming composition of the present invention contains a dye (A), an active energy ray-curable resin (B), a photopolymerization initiator (C), and a solvent (D). The colored layer-forming composition of the present invention may further contain an additive (E).

The thickness of the colored layer 10 is preferably 0.5 to 10 μm, for example. When the thickness of the colored layer 10 is at least the above lower limit, the pigment can be contained without causing an abnormality in the appearance of the colored layer 10, and the light absorption property of the pigment can improve the reflection characteristics and color reproducibility. . When the thickness of the colored layer 10 is equal to or less than the above upper limit, it is advantageous for thinning the display device.
The thickness of the colored layer 10 is obtained by observing a cross section of the optical film 1 in the thickness direction with a microscope or the like.

<Dye (A)>
The dye (A) contains at least a first colorant and a second colorant.
The absorption maximum wavelength of the first coloring material is in the range of 470-530 nm, and the half width of the absorption spectrum is 15-45 nm. When the maximum absorption wavelength is less than the above lower limit, the luminance efficiency of blue light emission tends to decrease, and when it exceeds the above upper limit, the luminance efficiency of green light emission tends to decrease. If the half-value width of the absorption spectrum is less than the lower limit, the effect of suppressing the reflection characteristics against external light is small, and if it exceeds the upper limit, the reflection characteristics against external light are likely to be improved, but the luminance efficiency is likely to be reduced. .

The absorption maximum wavelength of the second coloring material is in the range of 560-620 nm, and the half width of the absorption spectrum is 15-55 nm. When the maximum absorption wavelength is less than the above lower limit, the luminance efficiency of green light emission tends to decrease, and when it exceeds the above upper limit, the luminance efficiency of red light emission tends to decrease. If the half-value width of the absorption spectrum is less than the lower limit, the effect of suppressing the reflection characteristics against external light is small, and if it exceeds the upper limit, the reflection characteristics against external light are likely to be improved, but the luminance efficiency is likely to be reduced. .

The pigment (A) may further contain a coloring material other than the first coloring material and the second coloring material. Other coloring materials include a third coloring material.
The third colorant has a wavelength range of 650 to 780 nm with the lowest transmittance in the wavelength range of 380 to 780 nm. If the wavelength with the lowest transmittance in the wavelength range of 380 to 780 nm of the third colorant is less than the above lower limit, the luminance efficiency of red light emission is likely to be reduced, and if it is above the above upper limit, reflection of external light. The suppression effect on the characteristics becomes smaller.

The dye (A) is a porphyrin structure, a merocyanine structure, a phthalocyanine structure, an azo structure, a cyanine structure, a squarylium structure, a coumarin structure, a polyene structure, a quinone structure, a tetradiporphyrin structure, a pyrromethene structure, or an indigo structure. Alternatively, it preferably contains a metal complex thereof. In particular, it is more preferable to use a metal complex having a porphyrin structure, pyrromethene structure, or phthalocyanine structure, or a compound having a squarylium structure, because of their excellent reliability. The dye (A) may contain one of these compounds or metal complexes thereof, or may contain two or more thereof. These compounds or metal complexes thereof may be contained in the first colorant, may be contained in the second colorant, or may be contained in the third colorant. It may be contained in two or more kinds of coloring materials.

<Active energy ray-curable resin (B)>
The active energy ray-curable resin (B) is a resin that is polymerized and cured by irradiation with active energy rays such as ultraviolet rays and electron beams. For example, monofunctional, difunctional or trifunctional (meth)acrylate monomers, urethane (meth)acrylates, and the like can be used. (radical scavenging ability). Here, "(meth)acrylate" means both or either one of "acrylate" and "methacrylate".
The resin having radical scavenging ability contained in the active energy ray-curable resin (B) includes a resin having an amine structure. Here, the "amine structure" refers to a structure in which the hydrogen atoms of ammonia are replaced with hydrocarbon groups or aromatic atomic groups. Amine structures include primary amines, secondary amines, tertiary amines, and may be quaternary ammonium cations.

A resin having a radical scavenging ability has a function of scavenging radicals when the dye (A) is oxidatively deteriorated, and has a function of suppressing autoxidation, thereby suppressing dye deterioration (fading). Resins having an amine structure with radical scavenging ability include resins having a hindered amine structure with a molecular weight of 2000 or more. When the resin having a hindered amine structure has a molecular weight of 2000 or more, a high effect of suppressing fading can be obtained. It is believed that this is because many molecules remain in the colored layer 10 and a sufficient effect of suppressing fading can be obtained.
The molecular weight of the resin having a hindered amine structure is, for example, about 200,000, but the upper limit is not particularly limited.
As used herein, "molecular weight" means "mass average molecular weight" measured by gel permeation chromatography (GPC) using polystyrene as a standard substance.

In this embodiment, the resin having an amine structure with radical scavenging ability includes a structural unit represented by the following formula (1).

In formula (1), R ¹ is a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, or a alkylsulfonylaminocarbonyl group, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 or less carbon atoms, alkoxy group having 10 or less carbon atoms, alkylthio group having 10 or less carbon atoms, and 10 or less carbon atoms aryloxy group, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 carbon atoms or less, acyl group having 10 carbon atoms or less, carbamoyl group, sulfamoyl group, aryl group having 10 carbon atoms or less, substituted represents an amino group, a substituted ureido group, a substituted phosphono group, or a heterocyclic group, R ² represents a hydrogen atom or an alkyl group having 30 or less carbon atoms, X is a single bond, an ester group, or an aliphatic group having 30 or less carbon atoms represents a linking group formed by a group alkyl chain, an aromatic chain, a polyethylene glycol chain, or a combination of these, any of which may contain a spirodioxane ring.

R ¹ is preferably a hydrogen atom, a hydroxy group, or an alkyl group having 10 or less carbon atoms. The number of carbon atoms in the alkyl group is preferably 1-6, more preferably 1-3.
R ² is preferably a hydrogen atom or an alkyl group having 10 or less carbon atoms. The number of carbon atoms in the alkyl group is preferably 1-6, more preferably 1-3.
X is preferably a single bond or an aliphatic alkyl chain having 30 or less carbon atoms. The number of carbon atoms in the aliphatic alkyl chain is preferably 10 or less, preferably 1-6, more preferably 2-4.

In the present embodiment, the resin having an amine structure having radical scavenging ability is mainly a copolymer of a structural unit represented by formula (1) and a copolymer component having any of the repeating units described below. Let it be a component (the component with the largest percentage by mass).
By being a copolymer, the compatibility with other components can be controlled.

Examples of repeating units include (meth)acrylate repeating units, olefin repeating units, halogen atom-containing repeating units, styrene repeating units, vinyl acetate repeating units, and vinyl alcohol repeating units.

Examples of (meth)acrylate-based repeating units include repeating units derived from (meth)acrylate-based monomers having linear or branched alkyl groups in side chains, and repeating units derived from (meth)acrylate-based monomers having hydroxyl groups in side chains. etc.

Examples of the repeating unit derived from the (meth)acrylate monomer having a linear or branched alkyl group in the side chain include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, (meth)acrylate, ) isopropyl acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate , heptyl (meth)acrylate, octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, (meth)acrylic acid Decyl, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, myristyl (meth)acrylate, pentadecyl (meth)acrylate , hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, and octadecyl (meth)acrylate. These may be used alone or in combination of two or more. Among the above, a (meth)acrylate repeating unit having a linear or branched alkyl group having 1 to 4 carbon atoms in the side chain can be preferably used.

Examples of the repeating unit derived from the (meth)acrylic monomer having a hydroxyl group in the side chain include, for example, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 4-hydroxy (meth)acrylate. Examples include monomer-derived components such as butyl, 6-hydroxyhexyl (meth)acrylate, and hydroxyphenyl (meth)acrylate. These may be used alone or in combination of two or more.

Examples of olefinic repeating units include components derived from olefinic monomers such as ethylene, propylene, isoprene and butadiene. These may be used alone or in combination of two or more.

Examples of halogen atom-containing repeating units include monomer-derived components such as vinyl chloride and vinylidene chloride. These may be used alone or in combination of two or more.

Examples of styrene-based repeating units include components derived from styrene-based monomers such as styrene, α-methylstyrene, and vinyltoluene. These may be used alone or in combination of two or more.
Examples of vinyl acetate-based repeating units include esters of saturated carboxylic acids such as vinyl acetate and vinyl propionate with vinyl alcohol. These may be used alone or in combination of two or more.
Vinyl alcohol-based repeating units include, for example, vinyl alcohol, which may have a 1,2-glycol bond in its side chain.

The copolymer may have any structure of random copolymer, alternating copolymer, block copolymer and graft copolymer. If the structure of the copolymer is a random copolymer, the production process and preparation with other components are easy. Therefore, random copolymers are preferred over other copolymers.

Radical polymerization can be used as the polymerization method for obtaining the copolymer. Radical polymerization is preferable in that industrial production is easy. Radical polymerization may be a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, a suspension polymerization method, or the like. A solution polymerization method is preferably used for the radical polymerization. By using the solution polymerization method, it is easy to control the molecular weight of the copolymer.

In radical polymerization, after diluting the above-mentioned monomer with a polymerization solvent, a polymerization initiator may be added to polymerize the monomer.
The polymerization solvent may be, for example, an ester solvent, an alcohol ether solvent, a ketone solvent, an aromatic solvent, an amide solvent, an alcohol solvent, or the like. Examples of ester solvents include methyl acetate, ethyl acetate, n-butyl acetate, isobutyl acetate, t-butyl acetate, methyl lactate, and ethyl lactate. Alcohol ether solvents include, for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, 3-methoxy-1-butanol, and 3-methoxy- 3-methyl-1-butanol and the like. Ketone solvents may be, for example, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and the like. Aromatic solvents may be, for example, benzene, toluene, and xylene. Amide-based solvents may be, for example, formamide and dimethylformamide. Alcoholic solvents may be, for example, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, s-butanol, t-butanol, diacetone alcohol, and 2-methyl-2-butanol. . In addition, in the polymerization solvent mentioned above, you may use individually by 1 type, and may mix and use 2 or more types.

Radical polymerization initiators may be, for example, peroxides, azo compounds, and the like. Peroxides can be, for example, benzoyl peroxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, and di-t-butyl peroxide. Azo compounds include, for example, azobisisobutyronitrile, azobisamidinopropane salts, azobiscyanovaleric acid (salts), and 2,2′-azobis[2-methyl-N-(2-hydroxyethyl) propionamide].

The amount of the radical polymerization initiator used is preferably 0.0001 parts by mass or more and 20 parts by mass or less, and 0.001 parts by mass or more and 15 parts by mass or less when the total amount of the monomers is set to 100 parts by mass. is more preferable, and more preferably 0.005 parts by mass or more and 10 parts by mass or less. The radical polymerization initiator may be added to the monomers and the polymerization solvent before the initiation of polymerization, or may be dropped into the polymerization reaction system. Dropping the radical polymerization initiator into the polymerization reaction system with respect to the monomer and the polymerization solvent is preferable in that heat generation due to polymerization can be suppressed.

The reaction temperature for radical polymerization is appropriately selected according to the types of radical polymerization initiator and polymerization solvent. The reaction temperature is preferably 60° C. or higher and 110° C. or lower from the viewpoint of ease of production and reaction controllability.

When the resin having an amine structure with radical scavenging ability is a polymer containing the structural unit represented by formula (1), the content of the structural unit represented by formula (1) is the active energy ray-curable resin ( It is preferably 1 to 95 mol %, more preferably 10 to 90 mol %, relative to the total molar amount of the monomers constituting B). When the content of the structural unit represented by formula (1) is within the above numerical range, the dye (A) has improved light resistance and heat resistance, and fading is easily suppressed.

The active energy ray-curable resin (B) may further contain a polymer containing a structural unit represented by the following formula (2).

In formula (2), R ³ is a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, or a alkylsulfonylaminocarbonyl group, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 or less carbon atoms, alkoxy group having 10 or less carbon atoms, alkylthio group having 10 or less carbon atoms, and 10 or less carbon atoms aryloxy group, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 carbon atoms or less, acyl group having 10 carbon atoms or less, carbamoyl group, sulfamoyl group, aryl group having 10 carbon atoms or less, substituted represents an amino group, a substituted ureido group, a substituted phosphono group, or a heterocyclic group, R ⁴ represents a hydrogen atom or an alkyl group having 30 or less carbon atoms, X is a single bond, an ester group, or an aliphatic group having 30 or less carbon atoms represents a linking group formed by a group alkyl chain, an aromatic chain, a polyethylene glycol chain, or a combination of these, any of which may contain a spirodioxane ring.

R ³ is preferably a hydrogen atom, a hydroxy group, or an alkyl group having 10 or less carbon atoms. The number of carbon atoms in the alkyl group is preferably 1-6, more preferably 1-3.
R ⁴ is preferably a hydrogen atom or an alkyl group having 10 or less carbon atoms. The number of carbon atoms in the alkyl group is preferably 1-6, more preferably 1-3.
X is preferably a single bond or an aliphatic alkyl chain having 30 or less carbon atoms. The number of carbon atoms in the aliphatic alkyl chain is preferably 10 or less, preferably 1-6, more preferably 2-4.

In this embodiment, the polymer containing the structural unit represented by formula (2) may be a copolymer with a monomer different from the structural unit represented by formula (2). Compatibility with other components can be controlled by forming a copolymer.

The copolymerization component includes any one of the above-described (meth)acrylate repeating units, olefin repeating units, halogen atom-containing repeating units, styrene repeating units, vinyl acetate repeating units, and vinyl alcohol repeating units. I can give an example.

The copolymer may have any structure of random copolymer, alternating copolymer, block copolymer and graft copolymer. If the structure of the copolymer is a random copolymer, the production process and preparation with other components are easy. Therefore, random copolymers are preferred over other copolymers.

Radical polymerization can be used as the polymerization method for obtaining the copolymer. Radical polymerization is preferable in that industrial production is easy. Radical polymerization may be a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, a suspension polymerization method, or the like. A solution polymerization method is preferably used for the radical polymerization. By using the solution polymerization method, it is easy to control the molecular weight of the copolymer.

In radical polymerization, after diluting the above-mentioned monomer with a polymerization solvent, a polymerization initiator may be added to polymerize the monomer.
The polymerization solvent may be, for example, an ester solvent, an alcohol ether solvent, a ketone solvent, an aromatic solvent, an amide solvent, an alcohol solvent, or the like. Examples of ester solvents include methyl acetate, ethyl acetate, n-butyl acetate, isobutyl acetate, t-butyl acetate, methyl lactate, and ethyl lactate. Alcohol ether solvents include, for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, 3-methoxy-1-butanol, and 3-methoxy- 3-methyl-1-butanol and the like. Ketone solvents may be, for example, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and the like. Aromatic solvents may be, for example, benzene, toluene, and xylene. Amide-based solvents may be, for example, formamide and dimethylformamide. Alcoholic solvents may be, for example, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, s-butanol, t-butanol, diacetone alcohol, and 2-methyl-2-butanol. . In addition, in the polymerization solvent mentioned above, you may use individually by 1 type, and may mix and use 2 or more types.

Radical polymerization initiators may be, for example, peroxides, azo compounds, and the like. Peroxides can be, for example, benzoyl peroxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, and di-t-butyl peroxide. Azo compounds include, for example, azobisisobutyronitrile, azobisamidinopropane salts, azobiscyanovaleric acid (salts), and 2,2′-azobis[2-methyl-N-(2-hydroxyethyl) propionamide].

The amount of the radical polymerization initiator used is preferably 0.0001 parts by mass or more and 20 parts by mass or less, and 0.001 parts by mass or more and 15 parts by mass or less when the total amount of the monomers is set to 100 parts by mass. is more preferable, and more preferably 0.005 parts by mass or more and 10 parts by mass or less. The radical polymerization initiator may be added to the monomers and the polymerization solvent before the initiation of polymerization, or may be dropped into the polymerization reaction system. Dropping the radical polymerization initiator into the polymerization reaction system with respect to the monomer and the polymerization solvent is preferable in that heat generation due to polymerization can be suppressed.

The reaction temperature for radical polymerization is appropriately selected according to the types of radical polymerization initiator and polymerization solvent. The reaction temperature is preferably 60° C. or higher and 110° C. or lower from the viewpoint of ease of production and reaction controllability.

When the active energy ray-curable resin (B) contains a polymer containing a structural unit represented by formula (2), the content of the structural unit represented by formula (2) is the active energy ray-curable resin ( It is preferably 1 to 50 mol %, more preferably 1 to 30 mol %, relative to the total molar amount of the monomers constituting B). When the content of the structural unit represented by the formula (2) is within the above numerical range, the dye (A) has improved light resistance and heat resistance, and fading is easily suppressed.

In addition, examples of monofunctional (meth)acrylate compounds that can be contained in the active energy ray-curable resin (B) include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxy Butyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, glycidyl (meth)acrylate, acryloylmorpholine, N-vinylpyrrolidone, tetrahydrofurfuryl acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isobornyl (meth)acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, cetyl (meth)acrylate, stearyl (meth)acrylate, benzyl (Meth) acrylate, 2-ethoxyethyl (meth) acrylate, 3-methoxybutyl (meth) acrylate, ethyl carbitol (meth) acrylate, phosphoric acid (meth) acrylate, ethylene oxide-modified phosphoric acid (meth) acrylate, phenoxy ( meth)acrylate, ethylene oxide-modified phenoxy (meth)acrylate, propylene oxide-modified phenoxy (meth)acrylate, nonylphenol (meth)acrylate, ethylene oxide-modified nonylphenol (meth)acrylate, propylene oxide-modified nonylphenol (meth)acrylate, methoxydiethylene glycol (meth)acrylate ) acrylate, methoxypolyethylene glycol (meth)acrylate, methoxypropylene glycol (meth)acrylate, 2-(meth)acryloyloxyethyl-2-hydroxypropyl phthalate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, 2-( meth) acryloyloxyethyl hydrogen phthalate, 2-(meth) acryloyloxypropyl hydrogen phthalate, 2-(meth) acryloyloxypropyl hexahydrohydrogen phthalate, 2-(meth) acryloyloxypropyl tetrahydrohydrogen phthalate, dimethylaminoethyl (meth) acrylate, trifluoroethyl (meth)acrylate, tetrafluoropropyl (meth)acrylate, hexafluoropropyl (meth)acrylate, octafluoropropyl (meth)acrylate, 2-adamantane, monovalent mono(meth)acrylate derived from adamantanediol ) adamantane derivative mono(meth)acrylate such as adamantyl acrylate having acrylate. Here, "(meth)acryloyl" means both or either one of "acryloyl" and "methacryloyl".

In addition, examples of bifunctional (meth)acrylate compounds that can be contained in the active energy ray-curable resin (B) include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, butanediol di(meth) acrylate, hexanediol di(meth)acrylate, nonanediol di(meth)acrylate, ethoxylated hexanediol di(meth)acrylate, propoxylated hexanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate ) acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, hydroxy di(meth)acrylates such as neopentyl glycol pivalate di(meth)acrylate;

In addition, examples of tri- or more functional (meth)acrylate compounds that can be contained in the active energy ray-curable resin (B) include trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, Tri(meth)acrylates such as propoxylated trimethylolpropane tri(meth)acrylate, tris-2-hydroxyethylisocyanurate tri(meth)acrylate, glycerin tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate Trifunctional (meth)acrylate compounds such as (meth)acrylate and ditrimethylolpropane tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate , Dipentaerythritol penta (meth) acrylate, ditrimethylolpropane penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, ditrimethylol propane hexa (meth) acrylate trifunctional or more polyfunctional (meth) acrylate compounds and , polyfunctional (meth)acrylate compounds in which a part of these (meth)acrylates are substituted with an alkyl group or ε-caprolactone, and the like.

In addition, urethane (meth)acrylate can also be used as a resin that can be included in the active energy ray-curable resin (B). Examples of urethane (meth)acrylates include those obtained by reacting a product obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer with a (meth)acrylate monomer having a hydroxyl group. .

Examples of urethane (meth)acrylates include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate. Examples include urethane prepolymers, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymers, and dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymers.

Monofunctional, bifunctional or trifunctional (meth)acrylate monomers, urethane (meth)acrylates, etc. that can be included in the other active energy ray-curable resin (B) described above may be used singly. , may be used in combination of two or more. Moreover, the oligomer which partially polymerized may be sufficient.

The content of the active energy ray-curable resin (B) is preferably 20 to 80% by mass, more preferably 30 to 70% by mass, based on the total mass of the colored layer-forming composition. When the content of the active energy ray-curable resin (B) is at least the above lower limit, the effect of suppressing fading can be further enhanced. When the content of the active energy ray-curable resin (B) is equal to or less than the above upper limit, the handleability of the composition for forming a colored layer can be further enhanced.

<Photoinitiator (C)>
The photopolymerization initiator (C) generates radicals upon irradiation with ultraviolet rays, for example, when ultraviolet rays are used as active energy rays.
Examples of the photopolymerization initiator (C) include benzoins (benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin alkyl ethers such as benzoin isopropyl ether), phenylketones [e.g., acetophenones (e.g., acetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 1,1-dichloroacetophenone, etc.), 2- Alkylphenyl ketones such as hydroxy-2-methylpropiophenone; cycloalkylphenyl ketones such as 1-hydroxycyclohexylphenyl ketone, etc.], aminoacetophenones {2-methyl-1-[4-(methylthio)phenyl]- 2-morpholinoaminopropanone-1, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1 etc.}, anthraquinones (anthraquinone, 2-methylanthraquinone, 2-ethylanthraquinone, 2- t-butyl anthraquinone, 1-chloroanthraquinone, etc.), thioxanthones (2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, 2-chlorothioxanthone, 2,4-diisopropylthioxanthone, etc.), ketals (acetophenone dimethyl ketal, benzyl dimethyl ketal, etc.), benzophenones (benzophenone, etc.), xanthones, phosphine oxides (eg, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, etc.), and the like. One of these photopolymerization initiators may be used alone, or two or more thereof may be used in combination.

The content of the photopolymerization initiator (C) is preferably 0.01 to 20% by mass, more preferably 0.01 to 5% by mass, based on the solid content of the composition for forming a colored layer. If the content of the photopolymerization initiator (C) is less than the above lower limit, the curability will be insufficient. If the content of the photopolymerization initiator (C) is more than the above upper limit, unreacted photopolymerization initiator (C) will remain and reliability such as heat resistance will deteriorate.

<Solvent (D)>
Examples of the solvent (D) include ethers, ketones, esters, cellosolves and the like. Examples of ethers include dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydrofuran, anisole and phenetole. mentioned. Examples of ketones include acetone, methyl ethyl ketone, diethyl ketone, dipropyl ketone, diisobutyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone and ethylcyclohexanone. Examples of esters include ethyl formate, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n-pentyl acetate and γ-butyrolactone. Examples of cellosolves include methyl cellosolve, cellosolve (ethyl cellosolve), butyl cellosolve and cellosolve acetate. A solvent (D) may be used individually by 1 type, and may use 2 or more types together.

The content of the solvent (D) is preferably 20 to 80% by mass, more preferably 30 to 70% by mass, based on the total mass of the composition for forming a colored layer. When the content of the solvent (D) is at least the above lower limit, the handleability of the composition for forming a colored layer can be further enhanced. The time for forming a colored layer can be shortened as content of a solvent (D) is below the said upper limit.

<Additive (E)>
The additive (E) includes one or more selected from radical scavengers, peroxide decomposers and singlet oxygen quenchers.
Examples of radical scavengers include hindered amine light stabilizers such as 4-isopropylaminodiphenylamine, N-phenyl-1-naphthylamine, 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate; -di-t-butyl-p-cresol, 6,6'-di-t-butyl-4,4'-butylidenedi-m-cresol, and other phenolic antioxidants.
Examples of peroxide decomposers include sulfur-based antioxidants such as ditridecyl-3,3′-thiodipropionate, 2-mercaptobenzothiazole and 2-mercaptobenzimidazole, tris(nonylphenyl)phosphite, 2 -Phosphite-based antioxidants such as ethylhexyldiphenylphosphite.
Singlet oxygen quenchers include, for example, transition metal complexes of dialkyl phosphates, dialkyldithiocarbanoates, benzenedithiols or similar dithiols.
Additives (E) may be used alone or in combination of two or more.

In addition, other additives such as leveling agents, antifoaming agents, antioxidants, ultraviolet absorbers, light stabilizers, photosensitizers, and conductive materials may be used for the additive (E).

The content of the additive (E) is preferably 0.1 to 20% by mass, more preferably 0.1 to 15% by mass, based on the solid content of the composition for forming a colored layer. If the content of the additive (E) is less than the above lower limit, the effect of suppressing fading in light resistance and heat resistance of the dye (A) is not exhibited. If the content of the additive (E) is more than the above upper limit, insufficient curing tends to occur due to inhibition of curing by the additive (E) and a decrease in curing components.

By containing the colored layer-forming composition of the present invention, the colored layer 10 can improve light resistance and heat resistance, achieve both reflection suppression and luminance efficiency, improve display quality, and extend the life of the light emitting element. and improve color reproducibility.

≪Transparent substrate≫
The transparent substrate 20 is a sheet-like member positioned on one side of the colored layer 10 and forming the optical film 1 .
As a material for the transparent substrate 20, a translucent resin film can be used. As a material for forming the transparent substrate 20, a transparent resin or inorganic glass can be used. Examples of transparent resins include polyolefins, polyesters, polyacrylates, polyamides, polyimides, polyarylates, polycarbonates, triacetyl cellulose, polyvinyl alcohol, polyvinyl chloride, cycloolefin copolymers, norbornene-containing resins, polyethersulfones, polysulfones, and the like. mentioned. Examples of polyolefin include polyethylene and polypropylene. Examples of polyester include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and the like. Examples of polyacrylates include polymethyl methacrylate and the like. Polyamides include, for example, nylon 6, nylon 66, and the like. Among these, a film made of polyethylene terephthalate (PET), a film made of triacetyl cellulose (TAC), a film made of polymethyl methacrylate (PMMA), and a film made of polyester other than PET can be preferably used.
Although the thickness of the transparent substrate 20 is not particularly limited, it is preferably 10 to 100 μm, for example.
The transmittance of the transparent substrate 20 is preferably 90% or more, for example.

The transparent base material 20 may be provided with an ultraviolet absorbing ability. By adding an ultraviolet absorber to the resin that is the raw material of the transparent base material 20, the transparent base material 20 can be provided with an ultraviolet absorbing ability.

Examples of the ultraviolet absorber include salicylic acid ester ultraviolet absorbers, benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, benzotriazine ultraviolet absorbers, cyanoacrylate ultraviolet absorbers, and the like.
These ultraviolet absorbers may be used alone or in combination of two or more.

When the transparent substrate 20 is to be provided with an ultraviolet absorbing ability, the ultraviolet shielding rate is preferably 85% or more. Here, the ultraviolet shielding rate is a value measured according to JIS L1925, and calculated by the following formula (I).
Ultraviolet shielding rate (%) = 100 - average transmittance (%) of ultraviolet rays with a wavelength of 290 to 400 nm (I)
If the UV shielding rate is less than 85%, the effect of suppressing fading in the light resistance of the dye (A) is reduced.

≪Function layer≫
The functional layer 30 is located on one side or the other side of the colored layer 10 . The optical film can exhibit various functions by having the functional layer 30 .
Functions of the functional layer 30 include an antireflection function, an antiglare function, an oxygen barrier function, an antistatic function, an antifouling function, a strengthening function, an ultraviolet absorbing function (ultraviolet absorbing power), and the like.
The functional layer 30 may be a single layer or multiple layers. The functional layer 30 may have one type of function, or may have two or more types of functions.

When the optical film 1 has an antireflection function, the functional layer 30 functions as an antireflection layer. Examples of the antireflection layer include a hard coat layer 32, an antiglare layer 34, and a low refractive index layer 31 having a lower refractive index than the transparent substrate 20, which will be described later. The low refractive index layer 31 can be formed by using a material having a lower refractive index than the materials of the hard coat layer 32, the antiglare layer 34, and the transparent base material 20 for the functional layer.
For adjusting the refractive index of the low refractive index layer 31, lithium fluoride (LiF), magnesium fluoride ( _MgF2 ), _sodium hexafluoroaluminum (cryolite, cryolite, _3NaF.AlF3 , _Na3AlF6 ), Fine particles such as aluminum fluoride (AlF ₃ ) or silica fine particles may be blended. As the silica fine particles, it is effective to lower the refractive index of the low refractive index layer 31 by using porous silica fine particles, hollow silica fine particles, or the like having voids inside the particles. In addition, the composition for forming the low refractive index layer 31 (the composition for forming the low refractive index layer) contains the photopolymerization initiator (C), the solvent (D), and the additive (E) described in the colored layer 10. It may be blended as appropriate.
The refractive index of the low refractive index layer 31 is preferably 1.20 to 1.55.
Although the thickness of the low refractive index layer 31 is not particularly limited, it is preferably 40 nm to 1 μm, for example.

When the optical film 1 has an antiglare function, the functional layer 30 functions as an antiglare layer 34 . The anti-glare layer 34 is a layer that has minute unevenness on the surface, and that the unevenness scatters external light, suppresses glare, and improves display quality. When combined with the low refractive index layer 31, the low refractive index layer 31 and the antiglare layer 34 constitute an antireflection layer.
The anti-glare layer 34 contains at least one selected from organic fine particles and inorganic fine particles, if necessary. Organic fine particles are materials that form fine irregularities on the surface and provide the function of scattering external light. Examples of organic fine particles include translucent resin materials such as acrylic resins, polystyrene resins, styrene-(meth)acrylate copolymers, polyethylene resins, epoxy resins, silicone resins, polyvinylidene fluoride, and polyethylene fluoride resins. Resin particles consisting of In order to adjust the refractive index and the dispersibility of the resin particles, two or more kinds of resin particles having different materials (refractive indexes) may be mixed and used.
Inorganic fine particles are materials that adjust sedimentation and aggregation of organic fine particles. Examples of inorganic fine particles that can be used include silica fine particles, metal oxide fine particles, and various mineral fine particles. Examples of silica fine particles that can be used include colloidal silica and silica fine particles surface-modified with reactive functional groups such as (meth)acryloyl groups. Examples of metal oxide fine particles that can be used include alumina (aluminum oxide), zinc oxide, tin oxide, antimony oxide, indium oxide, titania (titanium dioxide), and zirconia (zirconium dioxide). Mineral fine particles include, for example, mica, synthetic mica, vermiculite, montmorillonite, iron montmorillonite, bentonite, beidellite, saponite, hectorite, stevensite, nontronite, magadiite, islarite, kanemite, layered titanate, smectite, synthetic Smectite and the like can be used. Mineral fine particles may be either natural products or synthetic products (including substituted products and derivatives), and a mixture of both may be used. Among the fine mineral particles, layered organoclays are more preferred. A layered organic clay is a swelling clay in which an organic onium ion is introduced between layers. The organic onium ion is not limited as long as it can be organized by utilizing the cation exchange property of the swelling clay. When layered organoclay minerals are used as fine mineral particles, the synthetic smectites described above can be suitably used. Synthetic smectite has the function of increasing the viscosity of the coating liquid for forming the antiglare layer, suppressing the sedimentation of resin particles and inorganic fine particles, and adjusting the irregular shape of the surface of the antiglare layer 34 (functional layer 30). have.

The functional layer 30 functions as an oxygen barrier layer 33 when the optical film 1 has an oxygen barrier function. The oxygen permeability of the oxygen barrier layer 33 is 10 cm ³ /(m ² ·day·atm) or less, preferably 5 cm ³ /(m ² ·day·atm) or less, and 1 cm ³ /(m ² ·day·atm) or less. ) below is more preferred. When the oxygen permeability of the oxygen barrier layer 33 is equal to or lower than the above upper limit value, the functional layer 30 can be provided with a sufficient oxygen barrier function. The lower limit of the oxygen permeability of the oxygen barrier layer 33 is not particularly limited, and may be 0 cm ³ /(m ² ·day·atm).
The oxygen permeability of the oxygen barrier layer 33 is a value measured using an oxygen permeability measuring device under the conditions of 30° C. and 60% relative humidity.

When the optical film 1 has an antistatic function, the functional layer 30 functions as an antistatic layer. The antistatic layer includes, for example, antimony-doped tin oxide (ATO), tin-doped indium oxide (ITO) and other metal oxide fine particles, polymeric conductive compositions, and antistatic materials such as quaternary ammonium salts. A layer containing an agent is included.
The antistatic layer may be provided on the outermost surface of the functional layer 30 or may be provided between the functional layer 30 and the transparent substrate 20 . Alternatively, an antistatic layer may be formed by adding an antistatic agent to any of the layers constituting the functional layer 30 described above. When an antistatic layer is provided, the optical film preferably has a surface resistance value of 1.0×10 ⁶ to 1.0×10 ¹² (Ω/cm).

When the optical film 1 has an antifouling function, the functional layer 30 functions as an antifouling layer. The antifouling layer enhances antifouling properties by imparting both or one of water repellency and oil repellency. Examples of the antifouling layer include layers containing antifouling agents such as silicon oxides, fluorine-containing silane compounds, fluoroalkylsilazanes, fluoroalkylsilanes, fluorine-containing silicon compounds, and perfluoropolyether group-containing silane coupling agents. be done.
The antifouling layer may be provided on the outermost surface of the functional layer 30, and the antifouling layer may be formed by adding an antifouling agent to the outermost layer of the functional layer 30 described above. .

When the optical film 1 has a reinforcing function, the functional layer 30 functions as a reinforcing layer. The reinforcing layer is a layer that enhances the strength of the optical film. Examples of the reinforcing layer include the hard coat layer 32 . The hard coat layer 32 includes, for example, a layer formed of a hard coat agent containing monofunctional, bifunctional, or trifunctional (meth)acrylate or urethane (meth)acrylate.

When the optical film 1 has ultraviolet absorption ability, the functional layer 30 functions as an ultraviolet absorption layer. Examples of the ultraviolet absorbing layer include triazines such as 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol, 2-(2H-benzotriazole-2- A layer containing a benzotriazole-based ultraviolet absorber such as yl)-4-methylphenol can be used.
The content of the ultraviolet absorber is preferably 0.1 to 5% by weight with respect to the total weight of the material forming the ultraviolet absorbing layer. When the content of the ultraviolet absorber is at least the above lower limit value, the functional layer 30 can be provided with sufficient ultraviolet absorbability. When the content of the ultraviolet absorber is equal to or less than the above upper limit, it is possible to avoid insufficient hardness due to a decrease in the curing component.

In the optical film 1, one or both of the transparent substrate 20 and the functional layer 30 has an ultraviolet shielding rate of 85% or more, preferably 90% or more, more preferably 95% or more, and may be 100%. Light resistance and heat resistance can be improved more as an ultraviolet shielding rate is more than the said lower limit.
The ultraviolet shielding rate can be measured according to the method described in JIS L1925.
The UV shielding rate can be adjusted by imparting UV absorbing ability to one or both of the transparent substrate 20 and the functional layer 30 .

The thickness of the functional layer 30 is, for example, preferably 0.04 to 25 μm, more preferably 0.1 to 20 μm, even more preferably 0.2 to 15 μm. When the thickness of the functional layer 30 is at least the above lower limit, it is easy to impart various functions to the optical film 1 . If the thickness of the functional layer 30 is equal to or less than the above upper limit, it is advantageous for thinning the display device.

[Method for producing optical film]
The optical film 1 of this embodiment can be manufactured by a conventionally known method.
For example, the colored layer 10 is obtained by applying the colored layer-forming composition to one surface of the transparent substrate 20 and curing the colored layer-forming composition by irradiating it with an active energy ray.
The light source for curing the colored layer-forming composition by irradiating active energy rays to form the colored layer 10 can be used without limitation as long as it generates active energy rays. As active energy rays, radiation (gamma rays, X-rays, etc.), light energy rays such as ultraviolet rays, visible rays, and electron beams (EB) can be used, and usually ultraviolet rays and electron beams are often used. For example, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, an electrodeless discharge tube, or the like can be used as a lamp that emits ultraviolet rays. As irradiation conditions, the amount of ultraviolet irradiation is usually 100 to 1000 mJ/cm ² .

Next, a hard coat layer 32 is obtained by applying a hard coat agent to the other surface of the transparent substrate 20 and curing the hard coat agent by irradiating active energy rays in the same manner as for the colored layer 10 .

By forming the low refractive index layer 31 on the hard coat layer 32, the optical film 1 in which the functional layer 30 is located on the other surface of the transparent substrate 20 is obtained.
The method for forming the low refractive index layer 31 is not limited, and the hard coat layer 32 is coated with a composition for forming a low refractive index layer and irradiated with an active energy ray to be cured. A coating method, an ion beam method, a plasma vapor deposition method, or the like can be used.

[Other embodiments]
As shown in FIG. 2, the optical film has a transparent substrate 20 located on one side of the colored layer 10, and comprises the colored layer 10, the transparent substrate 20, the oxygen barrier layer 33, the hard coat layer 32, the low refractive index The index layer 31 may be the optical film 2 laminated in this order. In the optical film 2 , the oxygen barrier layer 33 , the hard coat layer 32 and the low refractive index layer 31 constitute the functional layer 30 .
Since the optical film 2 of this embodiment has the oxygen barrier layer 33 , it is superior to the optical film 1 in oxygen barrier properties.

As shown in FIG. 3, the optical film has a transparent substrate 20 located on one side of the colored layer 10, and the colored layer 10, the transparent substrate 20, and the antiglare layer 34 are laminated in this order. It may be the optical film 3 . In the optical film 3 , the antiglare layer 34 constitutes the functional layer 30 .
Since the optical film 3 of the present embodiment has the antiglare layer 34, it is excellent in suppressing reflection.

As shown in FIG. 4, the optical film has a transparent substrate 20 positioned on one side of the colored layer 10, and the colored layer 10, the transparent substrate 20, the antiglare layer 34, and the low refractive index layer 31 are The optical film 4 may be laminated in this order. In the optical film 4 , the antiglare layer 34 and the low refractive index layer 31 constitute the functional layer 30 .
Since the optical film 4 of this embodiment has the low refractive index layer 31 and the antiglare layer 34, it is excellent in suppressing reflection.

As shown in FIG. 5, the optical film has a transparent substrate 20 located on one side of the colored layer 10 and a functional layer 30 located on the other side of the colored layer 10. The transparent substrate 20, The optical film 5 may be formed by laminating the colored layer 10, the hard coat layer 32, and the low refractive index layer 31 in this order. In the optical film 5 , the hard coat layer 32 and the low refractive index layer 31 constitute the functional layer 30 .
The optical film 5 of this embodiment has a colored layer 10 and a functional layer 30 having an ultraviolet absorption function and an antireflection function on one surface of a transparent substrate 20 .

As shown in FIG. 6, the optical film has a transparent substrate 20 located on one side of the colored layer 10 and a functional layer 30 located on the other side of the colored layer 10. The transparent substrate 20, The optical film 6 may be formed by laminating the colored layer 10, the oxygen barrier layer 33, the hard coat layer 32, and the low refractive index layer 31 in this order. In the optical film 6 , the oxygen barrier layer 33 , hard coat layer 32 and low refractive index layer 31 constitute the functional layer 30 .
Since the optical film 6 of this embodiment has the oxygen barrier layer 33, it has excellent oxygen barrier properties.

As shown in FIG. 7, the optical film has a transparent substrate 20 located on one side of the colored layer 10 and a functional layer 30 located on the other side of the colored layer 10. The transparent substrate 20, The colored layer 10 and the antiglare layer 34 may be the optical film 7 laminated in this order. In the optical film 7 , the antiglare layer 34 constitutes the functional layer 30 .
Since the optical film 7 of the present embodiment has the antiglare layer 34, it is excellent in suppressing reflection.

As shown in FIG. 8, the optical film has a transparent substrate 20 located on one side of the colored layer 10 and a functional layer 30 located on the other side of the colored layer 10. The transparent substrate 20, The optical film 8 may be formed by laminating the colored layer 10, the antiglare layer 34, and the low refractive index layer 31 in this order. In the optical film 8 , the antiglare layer 34 and the low refractive index layer 31 constitute the functional layer 30 .
Since the optical film 8 of this embodiment has the low refractive index layer 31 and the antiglare layer 34, it is excellent in suppressing reflection.

[Display device]
A display device of the present invention includes the optical film of the present invention. Specific examples of the display device include, for example, televisions, monitors, mobile phones, portable game devices, personal digital assistants, personal computers, electronic books, video cameras, digital still cameras, head-mounted displays, navigation systems, sound playback devices ( car audio, digital audio player, etc.), copiers, facsimiles, printers, multifunction printers, vending machines, automated teller machines (ATMs), personal authentication devices, optical communication devices, IC cards, and the like. Above all, it is suitably used for a display device equipped with self-luminous elements such as LEDs, organic ELs, inorganic phosphors, and quantum dots, which are susceptible to external light reflection due to metal electrodes and wiring.

According to the optical film of the present embodiment, since it has a colored layer containing the colored layer-forming composition of the present invention, it is possible to improve light resistance and heat resistance and achieve both antireflection and luminance efficiency. Therefore, the display device including the optical film of the present embodiment can improve the display quality and extend the life of the light emitting element.

As described above, each embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment. included.

For example, although the optical film of the present embodiment has one colored layer 10, the number of colored layers may be two or more.
In the optical film of this embodiment, the ultraviolet absorbing ability may be imparted to the transparent substrate 20 or to the functional layer 30 such as the hard coat layer 32 .

EXAMPLES The present invention will be described in more detail below using examples, but the present invention is not limited to these examples.

[Examples 1 to 8, Comparative Examples 1 to 5]
In the following examples and comparative examples, optical films A to M having layer structures shown in Tables 1 and 2 were produced. The optical films A to M produced were evaluated for optical film characteristics and display device characteristics for an organic EL panel by simulation. In the table, "-" indicates that the layer is not included.

≪Preparation of optical film≫
A method for forming each layer will be described below.

[Formation of colored layer]
(Materials used for colored layer-forming composition)
The following materials were used for the colored layer-forming composition used to form the colored layer.
The absorption maximum wavelength, half width, and minimum transmittance wavelength in the specified wavelength range of the coloring material are characteristic values of the cured coating film.

<Dye (A)>
- First coloring material Dye-1: pyrromethene cobalt complex dye represented by the following formula (3) (maximum absorption wavelength: 493 nm, half width: 26 nm).
Second colorant Dye-2: Tetraazaporforin copper complex dye (PD-311S manufactured by Yamamoto Kasei Co., Ltd., maximum absorption wavelength: 586 nm, half width: 22 nm).
Dye-3: Tetraazaporforin copper complex dye (manufactured by Yamada Kagaku Kogyo Co., Ltd., FDG-007, absorption maximum wavelength 595 nm, half width 22 nm).
- Third coloring material Dye-4: phthalocyanine copper complex dye (manufactured by Yamada Kagaku Kogyo Co., Ltd., FDN-002, minimum transmittance wavelength at 400 to 780 nm: 780 nm).

<Active energy ray-curable resin (B)>
Resin 1: A resin having an amine structure (molecular weight: 120,000) in which R ¹ in formula (1) is CH ₃ , R ² is CH ₃ , and X is a single bond.
Resin 2: A resin having a phenol structure (molecular weight: 51,500) in which R ³ in formula (2) is CH ₃ , R ⁴ is H, and X is a single bond.
UA-306H: Pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer (UA-306H, manufactured by Kyoeisha Chemical Co., Ltd.).
- DPHA: dipentaerythritol hexaacrylate.
• PETA: pentaerythritol triacrylate.

<Production Example of Resin 1>
1,2,2,6,6-pentamethyl-4-piperidyl methacrylate (manufactured by Showa Denko Materials Co., Ltd., FA-711MM) 2.4 g, methyl methacrylate (manufactured by Kanto Chemical Co., Ltd.) 5.6 g, 31 g of cyclohexanone (manufactured by Kanto Chemical Co., Ltd.) and 0.11 g of 2,2′-azobis(isobutyronitrile) (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) were placed in a reaction vessel and heated to 70° C. under a nitrogen gas atmosphere. was heated and stirred for 8 hours. Then, the polymer solution was obtained by heat-stirring at 100 degreeC for 1 hour. This polymer solution was poured into 400 mL of methanol (manufactured by Kanto Kagaku Co., Ltd.), and the resulting precipitate was filtered and dried to give 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate: methacrylic acid. A resin 1 copolymerized with methyl=15:85 [mol %] was obtained.

<Production Example of Resin 2>
4-hydroxyphenyl methacrylate (manufactured by Showa Denko K.K., Shaunol ARP-029P) 2.4 g, methyl methacrylate (manufactured by Kanto Chemical Co., Ltd.) 5.6 g, cyclohexanone (manufactured by Kanto Chemical Co., Ltd.) 32 g, 0.11 g of 2,2′-azobis(isobutyronitrile) (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.) was placed in a reaction vessel and heated and stirred at 70° C. for 8 hours in a nitrogen gas atmosphere. Then, the polymer solution was obtained by heat-stirring at 100 degreeC for 1 hour. This polymer solution was poured into 400 mL of methanol (manufactured by Kanto Kagaku Co., Ltd.), and the resulting precipitate was filtered and dried to obtain a covalent mixture of 4-hydroxyphenyl methacrylate:methyl methacrylate = 19:81 [mol%]. A polymerized resin 2 was obtained.

By performing additional heating and stirring at 100 ° C. for 1 hour, the initiator 2,2'-azobis(isobutyronitrile) can be completely decomposed, and deterioration of the optical film due to the residual initiator can be suppressed. be able to.
In addition, by pouring the polymer solution into methanol, unreacted monomers, polymerization solvents, decomposition products of the initiator, etc. can be removed, and deterioration of the optical film can be suppressed.

<Photoinitiator (C)>
- Omnirad TPO: an acylphosphine oxide-based photopolymerization initiator (manufactured by IGM Resins B.V.).

<Solvent (D)>
• MEK: methyl ethyl ketone.
• Methyl acetate: methyl acetate.

<Additive (E)>
- D1781: singlet oxygen quencher, bis(dibutyldithiocarbamate) nickel (II), product code D1781 (manufactured by Tokyo Chemical Industry Co., Ltd.).
- Tinuvin249: hindered amine light stabilizer, Tinuvin (registered trademark) 249 (manufactured by BASF Japan Ltd., molecular weight 482).
AO-60: Phenolic antioxidant, ADEKA STAB (registered trademark) AO-60 (manufactured by ADEKA Co., Ltd.).
- Tinuvin 479: a hydroxyphenyltriazine-based ultraviolet absorber, Tinuvin (registered trademark) 479 (manufactured by BASF Japan Ltd.).
· LA-36: benzotriazole-based UV absorber, ADEKA STAB (registered trademark) LA-36 (manufactured by ADEKA Corporation).

(Transparent substrate)
The following materials were used as the transparent substrate.
TAC: triacetyl cellulose film (TG60UL, substrate thickness 60 µm, ultraviolet shielding rate 92.9%, manufactured by Fuji Film Co., Ltd.).
- PMMA: polymethyl methacrylate film (manufactured by Sumitomo Chemical Co., Ltd., W002N80, substrate thickness: 80 µm, UV shielding rate: 13.9%).

(Formation of colored layer)
The colored layer-forming composition shown in Table 3 was applied onto the transparent substrate shown in Tables 1 and 2, and dried in an oven at 80°C for 60 seconds. After that, the coating film is cured by performing ultraviolet irradiation with an irradiation dose of 150 mJ/cm ² (manufactured by Fusion UV Systems Japan Co., Ltd., light source H bulb) using an ultraviolet irradiation device, and the film thickness after curing is 5.0 μm. A colored layer was formed so as to be In addition, the addition amount is a mass ratio (mass %). In the table, "-" indicates that the component is not contained.

[Formation of functional layer: oxygen barrier layer]
(Composition for forming oxygen barrier layer)
· Polyvinyl alcohol (PVA) resin for binder, Kuraray Poval (registered trademark) PVA-117 (manufactured by Kuraray Co., Ltd.) 80 mass% aqueous solution.

(Formation of oxygen barrier layer)
An oxygen barrier layer having an oxygen permeability of 1 cm ³ /(m ² ·day · atm) was obtained by coating the above composition for forming an oxygen barrier layer on the transparent substrate of Example 7 shown in Table 1 and drying it. formed.

[Formation of functional layer: hard coat layer]
(Materials used in composition for forming hard coat layer)
The following materials were used for the hard coat layer-forming composition used to form the hard coat layer.
Active energy ray-curable resin UA-306H: pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer (UA-306H, manufactured by Kyoeisha Chemical Co., Ltd.).
DPHA: dipentaerythritol hexaacrylate.
PETA: pentaerythritol triacrylate.
- Photopolymerization initiator Omnirad TPO: Acylphosphine oxide-based photopolymerization initiator (manufactured by IGM Resins B.V.).
・Additive (ultraviolet (UV) absorber)
Tinuvin 479: Hydroxyphenyltriazine-based UV absorber, Tinuvin (registered trademark) 479 (manufactured by BASF Japan Ltd.).
LA-36: benzotriazole-based ultraviolet absorber, ADEKA STAB (registered trademark) LA-36 (manufactured by ADEKA Corporation).
• Solvent MEK: methyl ethyl ketone.
Methyl acetate: Methyl acetate.

(Formation of hard coat layer)
The composition for forming a hard coat layer shown in Table 4 was applied onto the transparent substrate or oxygen barrier layer shown in Tables 1 and 2, and dried in an oven at 80°C for 60 seconds. After that, the coating film is cured by performing ultraviolet irradiation with an irradiation dose of 150 mJ/cm ² (manufactured by Fusion UV Systems Japan Co., Ltd., light source H bulb) using an ultraviolet irradiation device, and the film thickness after curing is 5.0 μm. A hard coat layer was formed so as to be In addition, the addition amount is a mass ratio (mass %). In the table, "-" indicates that the component is not contained.

[Formation of functional layer: antiglare layer]
(Composition for forming antiglare layer)
The following composition was used as the antiglare layer-forming composition for forming the antiglare layer.
Active energy ray-curable resin pentaerythritol triacrylate, light acrylate PE-3A (manufactured by Kyoeisha Chemical Co., Ltd., refractive index 1.52) 43.7 parts by mass.
- Photoinitiator Omnirad TPO (manufactured by IGM Resins B.V.) 4.55 parts by mass.
- Resin particles Styrene-methyl methacrylate copolymer particles (refractive index 1.515, average particle size 2.0 µm) 0.5 parts by mass.
- Inorganic fine particles Synthetic sukumetite 0.25 parts by mass.
Alumina nanoparticles (average particle size 40 nm) 1.0 parts by mass.
- Solvent toluene 15 parts by mass.
Isopropyl alcohol 35 parts by mass.

(Formation of antiglare layer)
The antiglare layer-forming composition was applied onto the transparent substrate shown in Table 1 and dried in an oven at 80° C. for 60 seconds. After that, the coating film is cured by performing ultraviolet irradiation with an irradiation dose of 150 mJ/cm ² (manufactured by Fusion UV Systems Japan Co., Ltd., light source H bulb) using an ultraviolet irradiation device, and the film thickness after curing is 5.0 μm. The antiglare layer was formed so that

[Formation of functional layer: low refractive index layer]
(Composition for forming low refractive index layer)
The following composition was used for forming the low refractive index layer.
• Refractive index adjuster: 8.5 parts by mass of porous silica fine particles (average particle size: 75 nm, solid content: 20%) methyl isobutyl ketone dispersion.
Antifouling agent Optool (registered trademark) AR-110 (manufactured by Daikin Industries, Ltd., solid content 15%, solvent: methyl isobutyl ketone) 5.6 parts by mass.
- Active energy ray-curable resin Pentaerythritol triacrylate (PETA) 0.4 parts by mass.
- Photopolymerization initiator Omnirad TPO (manufactured by IGM Resins B.V.) 0.07 parts by mass.
· Leveling agent RS-77 (manufactured by DIC Corporation) 1.7 parts by mass.
- Solvent Methyl isobutyl ketone 83.73 parts by mass.

(Formation of low refractive index layer)
The composition for forming a low refractive index layer was applied onto the hard coat layer or the antiglare layer shown in Tables 1 and 2, and dried in an oven at 80°C for 60 seconds. After that, the coating film is cured by performing ultraviolet irradiation with an irradiation dose of 200 mJ/cm ² (manufactured by Fusion UV Systems Japan Co., Ltd., light source H bulb) using an ultraviolet irradiation device, and the film thickness after curing is 100 nm. A low refractive index layer was formed.

[Film property evaluation]
<Ultraviolet shielding rate on the colored layer>
When the transparent base material was formed above the colored layer, the transmittance of the base material was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.). In addition, when the colored layer is above the base material, peel off the upper layer from the colored layer using a transparent pressure-sensitive adhesive tape compliant with JIS-K5600-5-6: 1999 adhesion test, and use an automatic spectrophotometer (( Using U-4100 manufactured by Hitachi, Ltd., the transmittance of the upper layer of the colored layer was measured using the adhesive tape as a reference. Using these transmittances, the average transmittance [%] in the ultraviolet region (290 nm to 400 nm) is calculated, and the ultraviolet shielding rate [%] is changed from 100% to the average transmittance [%] in the ultraviolet region (290 nm to 400 nm). was calculated as the value after subtracting

<Light resistance test>
A xenon weather meter tester (manufactured by Suga Test Instruments Co., Ltd., ^X75 ) was used to test the lightfastness of the obtained optical film. % RH conditions for 120 hours, transmittance is measured using an automatic spectrophotometer (manufactured by Hitachi, Ltd., U-4100) before and after the test, and the minimum transmittance before the test in the wavelength range of 470 nm to 530 nm. A transmittance difference ΔTλ1 before and after the test at the wavelength λ1 indicating the transmittance was calculated, and a transmittance difference ΔTλ2 before and after the test at the wavelength λ2 indicating the minimum transmittance before the test in the wavelength range of 560 nm to 620 nm. The transmittance difference is preferably close to zero, preferably |ΔTλN|≦20 (N=1 to 3), more preferably |ΔTλN|≦10 (N=1 to 3).

<Heat resistance test>
As a heat resistance test of the obtained optical film, the test was performed at 90° C. for 500 hours, and the transmittance was measured using an automatic spectrophotometer (manufactured by Hitachi, Ltd., U-4100) before and after the test. The transmittance difference ΔTλ1 before and after the test at the wavelength λ1 that shows the minimum transmittance before the test in the range of 470 nm to 530 nm, and the transmittance difference ΔTλ2 before and after the test at the wavelength λ2 that shows the minimum transmittance before the test in the wavelength range of 560 nm to 620 nm. Calculated. The transmittance difference is preferably close to zero, preferably |ΔTλN|≦20 (N=1 to 3), more preferably |ΔTλN|≦10 (N=1 to 3).

[Display device characteristic evaluation]
<White display transmission characteristics>
The transmittance of the obtained optical film was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.), and the efficiency of light transmitted through the optical film during white display was calculated using this transmittance. It was calculated and evaluated as a white display transmission characteristic. As a reference, the efficiency of the spectrum at the time of white display output through the white organic EL light source and the color filter having the spectrum shown in FIG. 9 was set to 100. The closer to 100, the higher the white display transmittance and the better the luminance efficiency.

<Display Device Reflection Characteristics>
The transmittance T(λ) and the surface reflectance R(λ) of the obtained optical film were measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.). For the measurement of the surface reflectance R (λ), the surface opposite to the outermost surface of the functional layer is coated with a matte black dye to prevent reflection, and the spectral reflectance at an incident angle of 5° is measured. The reflectance was taken as R(λ). In addition, the display panel reflectance is 40%, and the interface reflection and surface reflection in other layers are not considered. The relative reflection value when the reflection value was 100 was calculated based on the following formula (II) and evaluated as the reflection characteristics of the display device. The lower the value of the display device reflection characteristics, the more the reflection of external light can be reduced, and the more excellent the reflection characteristics are.

<Color reproducibility>
The transmittance of the obtained optical film was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.), and the spectrum shown in FIG. 9 was output through a white EL light source and a color filter. The red display, green display, and blue display spectra of were measured. The vertical axis of the graphs in FIGS. 9 and 10 indicates the emission intensity [a. u. ] (arbitrary unit). The NTSC (National Television Broadcasting Standards Committee) ratio is calculated from the CIE1931 chromaticity values calculated using the measured transmittance and the red display, green display, and blue display spectra in FIG. 10, and the NTSC ratio is used for color reproduction. It was evaluated as an index of sexuality. The higher the NTSC ratio, the better the color reproducibility.

Tables 5 and 6 show the results of the ultraviolet shielding rate on the colored layer, the light resistance test, and the heat resistance test as optical film property evaluations. Tables 5 and 6 show the results of white display transmission characteristics, display device reflection characteristics, and color reproducibility as evaluations of display device characteristics. In addition, in Comparative Example 5 using the optical film M having no colored layer, the measurement of the ultraviolet shielding rate on the colored layer, the light resistance test, and the heat resistance test were not performed. . Further, the ratio of the white display transmission characteristics based on the white display transmission characteristics in Comparative Example 5 (compared to Comparative Example 5), the ratio of the display device reflection characteristics based on the display device reflection characteristics in Comparative Example 5 (compared to Comparative Example 5) ) are shown in Tables 5 and 6, respectively.

From the results in Tables 5 and 6, coloring using a colored layer-forming composition comprising the dye (A) of the present invention, the active energy ray-curable resin (B), the photopolymerization initiator (C), and the solvent (D) The optical films having layers (Examples 1 to 8) are excellent in light resistance and heat resistance. The optical films (Examples 3 to 8) provided with a colored layer of the colored layer-forming composition to which a singlet oxygen quencher was further added as the additive (E) further improved in light resistance. In addition, when a transparent substrate having an ultraviolet absorption ability with an ultraviolet shielding rate of 85% or more (Examples 1 to 5, 7 to 8) or a functional layer (Example 6) is provided on the colored layer of the optical film, the coloring As compared with the case where the layer has an ultraviolet absorbing ability (Comparative Example 4), the light fastness was greatly improved. Further, when an oxygen barrier layer was provided on the colored layer of the present invention (Example 7), the light resistance was further improved.

Also, the reflective properties of the display devices comprising the colored layers of the present invention were significantly reduced (Examples 1 to 8). In addition, while the transmittance of circularly polarizing plates is said to be halved, white display transmittance is high, luminance efficiency is excellent, and color reproducibility is also improved, making it possible to achieve both improved display characteristics and reliability. I was able to confirm something.

1, 2, 3, 4, 5, 6, 7, 8 Optical film 10 Colored layer 20 Transparent substrate 30 Functional layer 31 Low refractive index layer 32 Hard coat layer 33 Oxygen barrier layer 34 Antiglare layer

Claims (11)

Containing a dye (A), an active energy ray-curable resin (B), a photopolymerization initiator (C), and a solvent (D),
The dye (A) contains a first colorant and a second colorant,
The first coloring material has a maximum absorption wavelength in the range of 470 to 530 nm and a half width of the absorption spectrum of 15 to 45 nm,
The second coloring material has a maximum absorption wavelength in the range of 560 to 620 nm and a half width of the absorption spectrum of 15 to 55 nm,
The active energy ray-curable resin (B) includes a structural unit represented by the following formula (1), a (meth)acrylate repeating unit, an olefin repeating unit, a halogen atom-containing repeating unit, a styrene repeating unit, and acetic acid. Containing a copolymer with a structural unit having either a vinyl repeating unit or a vinyl alcohol repeating unit,
A composition for forming a colored layer.

[In formula (1), R ¹ is a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, and a alkylsulfonylaminocarbonyl group, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 carbon atoms or less, alkoxy group having 10 carbon atoms or less, alkylthio group having 10 carbon atoms or less, 10 carbon atoms The following aryloxy group, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 carbon atoms or less, acyl group having 10 carbon atoms or less, carbamoyl group, sulfamoyl group, aryl group having 10 carbon atoms or less, represents a substituted amino group, a substituted ureido group, a substituted phosphono group, or a heterocyclic group; R ² represents a hydrogen atom or an alkyl group having 30 or less carbon atoms; X is a single bond, an ester group, or a It represents an aliphatic alkyl chain, an aromatic chain, a polyethylene glycol chain, or a linking group formed by combining these chains, any of which may contain a spirodioxane ring. ] The composition for forming a colored layer according to claim 1, wherein the active energy ray-curable resin (B) further contains a polymer containing a structural unit represented by the following formula (2).

[In formula (2), R ³ is a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, and a alkylsulfonylaminocarbonyl group, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 carbon atoms or less, alkoxy group having 10 carbon atoms or less, alkylthio group having 10 carbon atoms or less, 10 carbon atoms The following aryloxy group, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 carbon atoms or less, acyl group having 10 carbon atoms or less, carbamoyl group, sulfamoyl group, aryl group having 10 carbon atoms or less, represents a substituted amino group, a substituted ureido group, a substituted phosphono group, or a heterocyclic group; R ⁴ represents a hydrogen atom or an alkyl group having 30 or less carbon atoms; X is a single bond, an ester group, or a It represents an aliphatic alkyl chain, an aromatic chain, a polyethylene glycol chain, or a linking group formed by combining these chains, any of which may contain a spirodioxane ring. ] The polymer containing the structural unit represented by the formula (2) includes the structural unit represented by the formula (2), a (meth)acrylate repeating unit, an olefin repeating unit, a halogen atom-containing repeating unit, a styrene A copolymer with a structural unit having either a repeating unit, a vinyl acetate repeating unit, or a vinyl alcohol repeating unit,
The composition for forming a colored layer according to claim 2. 4. The colored layer formation according to any one of claims 1 to 3, further comprising one or more additives (E) selected from radical scavengers, peroxide decomposers and singlet oxygen quenchers. composition. 5. The composition for forming a colored layer according to claim 4, wherein the singlet oxygen quencher is a dialkyl phosphate, a dialkyldithiocarbanate, a benzenedithiol, or a transition metal complex thereof. A compound in which the dye (A) has any one of a porphyrin structure, a merocyanine structure, a phthalocyanine structure, an azo structure, a cyanine structure, a squarylium structure, a coumarin structure, a polyene structure, a quinone structure, a tetradiporphyrin structure, a pyrromethene structure and an indigo structure. and a metal complex thereof, the composition for forming a colored layer according to any one of claims 1 to 5. 7. Any one of claims 1 to 6, wherein the dye (A) further contains a third coloring material having the lowest transmittance wavelength in the range of 650 to 780 nm in the wavelength range of 380 to 780 nm. The composition for forming a colored layer according to 1. A colored layer that is a cured product of the colored layer forming composition according to any one of claims 1 to 7;
a transparent substrate positioned on one side of the colored layer;
a functional layer located on one or the other surface of the colored layer,
One or both of the transparent base material and the functional layer has an ultraviolet shielding rate of 85% or more measured according to the method described in JIS L1925,
The optical film, wherein the functional layer functions as an antireflection layer or an antiglare layer. 9. The optical film according to claim 8, further comprising an oxygen barrier layer having an oxygen permeability of 10 cm ^<3> /(m ^<2> *day*atm) or less as the functional layer. 10. The optical film according to claim 8, further comprising an antistatic layer or an antifouling layer as the functional layer. A display device comprising the optical film according to any one of claims 8 to 10.

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