JP6387651B2 - Blue light cut film, display device, and resin composition for blue light cut film - Google Patents

Description

  The present invention relates to a blue light cut film, a display device, and a resin composition for blue light cut film.

  In recent years, blue light emitted from a display device or the like is said to place a heavy burden on the eyes and body. Since the blue light reaches the retina without being absorbed by the cornea or the lens, damage to the retina has been pointed out, and it is said to cause eye strain, an effect on sleep, and the like. Blue light refers to blue light having a wavelength of 380 to 495 nm, and has strong energy even in visible light.

  In recent years, as a light source of a display device used for a personal computer, a smartphone, a tablet terminal, etc., a light source using a light emitting diode (LED) that generates a large amount of blue light has increased. Is increasing.

  As a technique for suppressing exposure to blue light, a blue light cut film or the like for placement on the display surface of an image display device has been put on the market. However, the blue light cut film currently on the market has a problem that the transmitted light is yellowish.

  Further, for example, in Patent Document 1, as a plastic spectacle lens excellent in specific wavelength absorption performance of visible light, a plastic comprising a dye layer containing a specific color material on at least one surface of a specific plastic substrate A spectacle lens is disclosed, and Patent Document 1 discloses an example using a compound having a main absorption peak having a half-value width of 45 nm between wavelengths of 430 nm to 440 nm as the colorant. The method of Patent Document 1 has a problem that transmitted light is yellowish.

JP 2013-228520 A

  The present invention has been made in view of the above circumstances, and is a blue light cut film that blocks blue light and suppresses the yellowness of transmitted light, and yellows in an image displayed while blocking blue light. An object of the present invention is to provide a display device with high image quality and a resin composition for a blue light cut film.

The blue light cut film according to the present invention is a blue light cut film having a blue light cut layer on at least one side of a transparent substrate,
The blue light cut layer is composed of a resin composition for a blue light cut film containing organic particles , a color material, and a binder component or a cured product thereof,
The color material is a test resin composition consisting of 5% by mass of the color material and a test binder component on one side of the test transparent substrate or a test film having a thickness of 3 μm consisting of a cured product thereof. The test laminate has the following formula (1) and formula (2).
ΔΤ ₄₅₀ = − (Τ ₄₅₀ −Τ ⁰ ₄₅₀ ) ≦ 5 Formula (1)
ΔΤ ₃₈₀ = − (Τ ₃₈₀ −Τ ⁰ ₃₈₀ ) ≧ 25 Formula (2)
(In Formula (1) and Formula (2), Τ ₄₅₀ and Τ ₃₈₀ represent the transmittance (%) of light having a wavelength of 450 nm and a wavelength of 380 nm, respectively, and Τ ⁰ ₄₅₀ and Τ ⁰ ₃₈₀ are The reference resin composition comprising the test binder component or the reference laminate having a thickness of 3 μm on the transparent test substrate, and a reference laminate having a wavelength of 450 nm and a wavelength of 380 nm. (Transmittance (%) is indicated.)

In Blue Light cut film of the present ^invention, it is preferable from the viewpoint of yellowness of transmitted light is suppressed ^{b *} defined in L ^* a * ^{b *} color space (CIE1976) is 2 or less.

The present invention provides a display device provided with the blue light cut film according to the present invention.
Further, the present invention is a resin composition for blue light cut film containing organic particles , a coloring material, and a binder component,
The color material is a test resin composition consisting of 5% by mass of the color material and a test binder component on one side of the test transparent substrate or a test film having a thickness of 3 μm consisting of a cured product thereof. A test laminate having a resin composition for a blue light cut film characterized by satisfying the above formulas (1) and (2).

  In the resin composition for a blue light cut film of the present invention, the content ratio of the coloring material is 0.5 to 20% by mass with respect to the total solid content of the resin composition for a blue light cut layer. This is preferable from the viewpoint of light shielding.

  According to the present invention, a blue light cut film that blocks blue light and suppresses yellowness of transmitted light, a display device that has no yellowing in an image displayed while blocking blue light, and The above resin composition for blue light cut film can be provided.

FIG. 1 is a schematic cross-sectional view showing an example of a blue light cut film according to the present invention. FIG. 2 is a schematic view showing an example of a display device according to the present invention.

Hereinafter, the present invention will be described in detail.
In the present invention, (meth) acryl represents each of acryl or methacryl, and (meth) acrylate represents each of acrylate or methacrylate.
Moreover, in this invention, hardened | cured material means what solidified through the chemical reaction.

1. Blue light cut film The blue light cut film according to the present invention is a blue light cut film having a blue light cut layer on at least one side of a transparent substrate,
The blue light cut layer is composed of a resin composition for a blue light cut film containing a light diffusing particle, a color material, and a binder component or a cured product thereof.
The color material is a test resin composition consisting of 5% by mass of the color material and a test binder component on one side of the test transparent substrate or a test film having a thickness of 3 μm consisting of a cured product thereof. The test laminate has the following formula (1) and formula (2).
_{ΔΤ 450 = - (Τ 450 -} Τ 0 450) ≦ 5 Equation (1)
_{ΔΤ 380 = - (Τ 380 -} Τ 0 380) ≧ 25 Equation (2)
(In Formula (1) and Formula (2), Τ ₄₅₀ and Τ ₃₈₀ represent the transmittance (%) of light having a wavelength of 450 nm and a wavelength of 380 nm, respectively, and Τ ⁰ ₄₅₀ and Τ ⁰ ₃₈₀ are The reference resin composition comprising the test binder component or the reference laminate having a thickness of 3 μm on the transparent test substrate, and a reference laminate having a wavelength of 450 nm and a wavelength of 380 nm. (Transmittance (%) is indicated.)

  The blue light cut film of this invention is demonstrated with reference to figures. FIG. 1 is a schematic cross-sectional view showing an example of the blue light cut film of the present invention. As shown in the example of FIG. 1, a blue light cut film 10 of the present invention has a blue light cut layer 2 on at least one surface side of a transparent substrate 1.

  The blue light cut film of the present invention has the above-mentioned specific color material and light diffusing particles in the blue light cut film layer, so that the blue light is shielded and the yellow color of the transmitted light is suppressed. It can be a light cut film.

The present inventors have studied earnestly in order to shield the blue light, which is said to put a burden on the eyes and body, while suppressing the yellowness of the transmitted light. Suppresses the yellowness of transmitted light while efficiently blocking the blue light that places a burden on the eyes and body by not blocking light near the wavelength of 450 nm, which is a complementary color of yellow, while sufficiently blocking nearby light We thought that it could be made a blue light cut film.
As a result of further studies, the present inventors have, as a color material used in the blue light cut layer, a color material that satisfies the above formulas (1) and (2) when the coating film for the specific test is used. It was found that a blue light cut film in which the yellowness of transmitted light was suppressed while efficiently blocking the blue light that imposes a burden on the eyes and the body was selected and used. As a result of further studies, the present inventors have used such a colorant in combination with the light diffusing particles, so that the light is diffused and more light passes between the light diffusing particles, so that the light in the blue light cut layer is increased. It was found that the optical path length can be increased and the effect of blocking blue light is excellent even when the blue light cut layer is a thin film.

  The blue light cut film of the present invention has at least a transparent substrate and a blue light cut layer, and may further have other layers as long as the effects of the present invention are not impaired. . Hereinafter, each layer which comprises a blue light cut film is demonstrated in detail in order.

[Blue light cut layer]
In the present invention, the blue light cut layer comprises a resin composition for a blue light cut film described later or a cured product thereof. A blue light cut film in which the yellowness of transmitted light is suppressed while efficiently blocking blue light that imposes a burden on the eyes and body by using a combination of light diffusing particles described later and a specific color material described later. A layer can be obtained.
Hereinafter, the blue light cut film composition of the present invention will be described.

<Resin composition for blue light cut film>
The blue light cut film according to the present invention is a resin composition for a blue light cut film containing light diffusing particles, a color material, and a binder component,
The color material is a test resin composition consisting of 5% by mass of the color material and a test binder component on one side of the test transparent substrate or a test film having a thickness of 3 μm consisting of a cured product thereof. The test laminate has the following formula (1) and formula (2).
_{ΔΤ 450 = - (Τ 450 -} Τ 0 450) ≦ 5 Equation (1)
_{ΔΤ 380 = - (Τ 380 -} Τ 0 380) ≧ 25 Equation (2)
(In Formula (1) and Formula (2), Τ ₄₅₀ and Τ ₃₈₀ represent the transmittance (%) of light having a wavelength of 450 nm and a wavelength of 380 nm, respectively, and Τ ⁰ ₄₅₀ and Τ ⁰ ₃₈₀ are The reference resin composition comprising the test binder component or the reference laminate having a thickness of 3 μm on the transparent test substrate, and a reference laminate having a wavelength of 450 nm and a wavelength of 380 nm. (Transmittance (%) is indicated.)

  The resin composition for a blue light cut film of the present invention is a composition suitable for the production of the blue light cut film of the present invention. The resin composition for a blue light cut film of the present invention has at least light diffusing particles, a coloring material, and a binder component, and other components as necessary within a range not impairing the effects of the present invention. It may be included. Hereinafter, each component which comprises the resin composition for blue light cut films is demonstrated.

(Coloring material)
In the present invention, as a color material, a test resin composition comprising 5% by mass of the color material and a test binder component on one side of the test transparent substrate or a test product having a thickness of 3 μm comprising a cured product thereof. In the test laminate having a coating film, one satisfying the following formulas (1) and (2) is used.
_{ΔΤ 450 = - (Τ 450 -} Τ 0 450) ≦ 5 Equation (1)
_{ΔΤ 380 = - (Τ 380 -} Τ 0 380) ≧ 25 Equation (2)
(In Formula (1) and Formula (2), Τ ₄₅₀ and Τ ₃₈₀ represent the transmittance (%) of light having a wavelength of 450 nm and a wavelength of 380 nm, respectively, and Τ ⁰ ₄₅₀ and Τ ⁰ ₃₈₀ are The reference resin composition comprising the test binder component or the reference laminate having a thickness of 3 μm on the transparent test substrate, and a reference laminate having a wavelength of 450 nm and a wavelength of 380 nm. (Transmittance (%) is indicated.)

  The above specific colorant has excellent light transmittance around 450 nm wavelength, so yellow color is suppressed, and among blue light, it is easy to absorb light around 380 nm with high energy, so blue light is efficient. While shielding well, the yellowness of transmitted light is suppressed.

In the present invention, whether the color material satisfies the above formulas (1) and (2) is determined by measuring as follows.
(A) Manufacture of test laminate On one side of a test transparent substrate, a test resin composition consisting of 5% by mass of a color material to be measured and a test binder component has a thickness after solidification or curing. The test laminate is obtained by coating to 3 μm and solidifying or curing.
The transparent substrate for testing can be appropriately selected from conventionally known substrates used for optical film applications. For example, the transparent substrate for testing is the same as the transparent substrate mentioned in the blue light cut film described later. be able to.
As the test binder component, it can be appropriately selected from conventionally known binder components used for optical film applications, for example, the same as the binder component mentioned in the blue light cut film described later. can do.
Moreover, the coating method of the resin composition for a test can be suitably selected from conventionally known coating methods, for example, can be the same as the coating method of a blue light cut film described later. The test resin composition may contain a solvent during coating.

(B) Method for Producing Reference Laminated Body Instead of the above test resin composition, a reference resin composition containing only the above test binder component and containing no coloring material is used. Similarly, a reference laminate is manufactured. The transparent substrate for test and the binder component for test used for the reference laminate are the same as those used for the test laminate.

(C) Transmittance measurement method Each of the obtained test laminate and reference laminate was measured using an ultraviolet-visible spectrophotometer (for example, UV-3100PC manufactured by Shimadzu Corporation), at least at a wavelength of 450 nm. The transmittance (%) of light and the transmittance (%) of light having a wavelength of 380 nm are measured.
According to the formula (1) and the formula (2), the difference between the transmittance of the test laminate and the transmittance of the reference laminate at each measurement wavelength allows the transmission of the color material to be substantially measured. The rate (ΔΤ) is determined.
When the transmittance (ΔΤ) of the color material to be measured thus obtained satisfies ΔΤ ₄₅₀ ≦ 5 and ΔΤ ₃₈₀ ≧ 25, the color material to be measured becomes the blue light of the present invention. It is judged that it is suitable as a color material used for a cut film. If ΔΤ ₄₅₀ ≦ 5, the colorant is excellent in light transmittance in the vicinity of a wavelength of 450 nm, so that yellowness of transmitted light can be suppressed. In addition, when ΔΤ ₃₈₀ ≧ 25, the colorant is excellent in shielding light in the vicinity of a wavelength of 380 nm, so that it is possible to efficiently shield high-energy blue light.

In the present invention, the color material preferably further satisfies the following formula (3) or the following formula (4), and more preferably satisfies both the following formula (3) and the following formula (4).
_{ΔΤ 390 = - (Τ 390 -} Τ 0 390) ≧ 5 formula (3)
_{ΔΤ 400 = - (Τ 400 -} Τ 0 400) ≧ 2 Equation (4)
(In Formula (3) and Formula (4), Τ ₃₉₀ and Τ ₄₀₀ represent the transmittance (%) of light at a wavelength of 390 nm and a wavelength of 400 nm of the test laminate, respectively, and Τ ⁰ ₃₉₀ and Τ ⁰ ₄₀₀ are The reference resin composition comprising the test binder component or the reference laminate having a thickness of 3 μm on the transparent substrate for test and a reference laminate having a wavelength of 390 nm and a wavelength of 400 nm, respectively. (Transmittance (%) is indicated.)

When the color material satisfies one or both of the above formula (3) and the above formula (4), not only the light in the vicinity of the wavelength 380 nm but also the light shielding property in the vicinity of the wavelength 390 nm and the wavelength 400 nm. It is excellent, and it is possible to more efficiently shield high-energy blue light.
In the present invention, a color material satisfying ΔΤ ₃₈₀ + ΔΤ ₃₉₀ ≧ 30 is more preferable, and a color material satisfying ΔΤ ₃₈₀ + ΔΤ ₃₉₀ + ΔΤ ₄₀₀ ≧ 35 is more preferable.

  Specific examples of such a colorant include, for example, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole (manufactured by BASF, Tinuvin 234), 2- (5-chloro-2-benzotriazolyl) -6-tert-butyl-p-cresol (manufactured by BASF, Tinuvin 326), BASF, Lumogen F Violet 570, and the like, but are not limited thereto. Absent. A color material can be used individually by 1 type or in combination of 2 or more types.

In the resin composition for a blue light cut layer of the present invention, the content ratio of the color material may be adjusted as appropriate, but from the viewpoint of efficiently blocking blue light and making a blue light cut film excellent in light transmittance, The content ratio of the coloring material is preferably 0.1 to 20% by mass, and preferably 1 to 10% by mass with respect to the total solid content of the resin composition for a blue light cut layer.
When a color material of 30 ≦ ΔΤ ₃₈₀ + ΔΤ ₃₉₀ <40 is used as a guideline for efficiently blocking blue light and making a blue light cut film excellent in total visible light transmittance, the blue light cut layer is used. It is preferable that the content rate of the said coloring material is 3-20 mass% with respect to the total solid of the resin composition for a glass. Moreover, when using a coloring material of ΔΤ ₃₈₀ + ΔΤ ₃₉₀ ≧ 40, the content ratio of the coloring material is 0.5 to 10% by mass with respect to the total solid content of the blue light cut layer resin composition. It is preferably 0.5 to 6% by mass.
In addition, in this invention, solid content means all the components except a solvent among the components which comprise a resin composition.

(Light diffusion particles)
In the present invention, when the light diffusing particles are included in the blue light cut layer, the light is diffused and more light passes between the light diffusing particles, and the optical path length in the blue light cut layer can be increased. Even if the thickness of the blue light cut layer is reduced, the blue light can be efficiently shielded.

The light diffusing particles can be appropriately selected from particles capable of diffusing light, and may be organic particles made of resin or inorganic particles.
Examples of the particles include acrylic resins such as polymethyl (meth) acrylate resins and acrylic-styrene copolymers, melamine resins, urea resins, polycarbonate resins, polystyrene resins, polyvinyl chloride, benzoguanamine-melamine formaldehyde, and the like.
Examples of the inorganic particles include silica, alumina, titanium oxide, zirconium oxide, calcium carbonate, and the like.
In the present invention, among these, organic particles are preferable and acrylic resins are more preferable from the viewpoint of affinity for the binder component described later.

The refractive index n ₁ of the light diffusing particles is not particularly limited and can be appropriately selected according to the purpose. Among them, it is preferable that the refractive index _{n 1} is 1.0 to 3.0, more preferably 1.2 to 1.6, still more preferably 1.3 to 1.5. When the refractive index is in the above range, the light diffusion (scattering) property in the blue light cut layer is good, the optical path length becomes long, and the blue light can be shielded efficiently.

In the present invention, the absolute value (| n ₁ −n ₂ |) of the difference between the refractive index n ₁ of the light diffusing particles and the refractive index n ₂ of the binder component described later may be 0.2 or more. From the point which is excellent in light diffusibility, it is more preferable that it is 0.2-1.0, and it is still more preferable that it is 0.2-0.5.

  The average particle diameter of the light diffusing particles is not particularly limited, but is preferably 0.5 to 10 μm, more preferably 0.5 to 6 μm, and still more preferably 1 to 3 μm. By setting the average particle size of the light diffusing particles to the upper limit value or less, the light diffusing property is excellent. Moreover, when the average particle diameter of the light diffusing particles is equal to or more than the above lower limit value, a blue light cut film having small wavelength dependency of light diffusion efficiency and small color change can be obtained.

In the present invention, the content ratio of the light diffusing particles may be appropriately adjusted. Especially, it is preferable that it is 0.1-20 mass% with respect to the total solid of the resin composition for blue light cut films from the point which is excellent in the shielding property of blue light, and it is more preferable that it is 1-10 mass%. preferable.
In the present invention, the light diffusing particles can be used singly or in combination of two or more.

(Binder component)
In the present invention, the binder component preferably contains at least a resin. The resin may be any of a thermoplastic resin, a thermosetting resin, and a photocurable resin.

  As thermoplastic resins, epoxy resins; acrylic resins such as polymethyl methacrylate and polyacrylic amide; polystyrene resins; cellulose resins such as nitrocellulose and ethyl cellulose; polyester resins; thermoplastic urethane resins; Preferred examples include modified olefin resins such as polyethylene and chlorinated polypropylene; vinyl resins such as vinyl acetate resins, vinyl chloride-vinyl acetate copolymers and butyral resins, and amorphous polyolefins having a norbornene structure.

In the present invention, in order to provide film formability and adhesion to a transparent substrate, which will be described later, and to provide sufficient hardness to the coating film, curability containing at least one of a thermosetting resin and a photocurable resin. It is preferable to contain a binder component. It does not specifically limit as a curable binder component, A conventionally well-known curable binder component can be used suitably.
Examples of the curable binder component include a photocurable binder component containing a photocurable resin that can be polymerized and cured by visible light, ultraviolet rays, electron beams, and the like, and a thermosetting resin that can be polymerized and cured by heating. The thing containing at least 1 sort (s) of the thermosetting binder component to contain can be used.

  As the thermosetting binder, a combination of a compound having two or more thermosetting functional groups in one molecule and a curing agent is usually used, and a catalyst capable of promoting a thermosetting reaction may be added. Examples of the thermosetting functional group include an epoxy group, an oxetanyl group, an isocyanate group, and an ethylenically unsaturated bond. An epoxy group is preferably used as the thermosetting functional group.

  On the other hand, the photocurable binder component contains an acrylate compound having at least two ethylenically unsaturated bonds in one molecule as the photocurable component. In the present invention, among them, a polyfunctional (meth) acrylate having two or more (meth) acryloyl groups in one molecule is preferable.

  Specific examples of such polyfunctional (meth) acrylates include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, propylene di (meth) acrylate, hexanediol di (meth) acrylate, polyethylene glycol di (meth) ) Acrylate, bisphenol A di (meth) acrylate, tetrabromobisphenol A di (meth) acrylate, bisphenol S di (meth) acrylate, butanediol di (meth) acrylate, di (meth) acrylate phthalate, ethylene oxide modified bisphenol A Di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, Lith (acryloxyethyl) isocyanurate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, urethane tri (meth) acrylate, ester tri (meth) acrylate, urethane hexa (meth) acrylate, ethylene oxide modified Examples thereof include trimethylolpropane tri (meth) acrylate, and the like can be used alone or in combination of two or more.

  When the binder component of the resin composition for blue light cut is a photocurable binder component, the content ratio of the acrylate compound having at least two ethylenically unsaturated bonds in one molecule is not particularly limited. Especially, it is preferable that it is 70-99 mass% with respect to the total solid in the resin composition for blue light cut layers from the point which is excellent in adhesiveness, and it is more preferable that it is 75-95 mass%.

Moreover, the resin composition for primer layers of this invention may use the monofunctional (meth) acrylate which has one (meth) acryloyl group in 1 molecule in combination with the said polyfunctional (meth) acrylate.
Specific examples of monofunctional (meth) acrylates include methyl (meth) acrylate, hexyl (meth) acrylate, decyl (meth) acrylate, allyl (meth) acrylate, benzyl (meth) acrylate, butoxyethyl (meth) acrylate, butoxy Ethylene glycol (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, glycerol (meth) acrylate, glycidyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate , 2-hydroxypropyl (meth) acrylate, isobornyl (meth) acrylate, isodexyl (meth) acrylate, isooctyl (meth) acrylate, lauryl (meth) acrylate 2-methoxyethyl (meth) acrylate, methoxyethylene glycol (meth) acrylate, phenoxyethyl (meth) acrylate, stearyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, biphenyloxyethyl acrylate, bisphenol A Examples include diglycidyl (meth) acrylate, biphenylyloxyethyl (meth) acrylate, ethylene oxide-modified biphenylyloxyethyl (meth) acrylate, bisphenol A epoxy (meth) acrylate, etc., alone or in combination of two or more. Can be used.

  Moreover, in order to start or accelerate the curing reaction of the polyfunctional acrylate and monofunctional acrylate, a photoinitiator (photopolymerization initiator) may be appropriately selected and used as necessary. Specific examples of the photoinitiator include, for example, bisacylphosphinoxide, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,2-dimethoxy-1, 2-diphenylethane-1-one, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, 2-methyl-1- [4- ( Methylthio) phenyl] -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,2-hydroxy-2-methyl-1-phenyl- Propane-1-ketone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, phenylbis (2,4,6-trimethylbenzo Le) - phosphine oxide, and the like. These can be used alone or in combination of two or more.

  When using a photoinitiator, content of the said photoinitiator is 0.4-20 mass% normally with respect to the total solid of the resin composition for blue light cut layers, and is 1-10 mass%. It is preferable.

(Optional additive)
The blue light cut layer resin composition of the present invention may contain various additives as long as the object of the present invention is not impaired. From the viewpoint of coatability, it usually contains a solvent.
The solvent does not react with each component in the blue light cut layer composition, and can be appropriately selected from solvents that can dissolve or disperse each component. For example, hydrocarbon solvents such as benzene, toluene, xylene, hexane, cyclohexane, ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, isophorone, tetrahydrofuran, 1,2-dimethoxyethane, propylene glycol monoethyl ether (PGME) Ether solvents such as chloroform, halogenated alkyl solvents such as dichloromethane, ester solvents such as methyl acetate, ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, amide solvents such as N, N-dimethylformamide, and the like Examples include sulfoxide solvents such as dimethyl sulfoxide, anan solvents such as cyclohexane, alcohol solvents such as methanol, ethanol, and propanol. The present invention is not limited to these. Moreover, the solvent used for the said composition may be used individually by 1 type, and the mixed solvent of two or more types of solvents may be sufficient as it.

  When using a solvent for the resin composition for blue light cut layer, from the viewpoint of coating properties, the ratio of the solid content to the total amount of the resin composition for blue light cut layer is preferably 3 to 70% by mass, more preferably Is preferably used so as to be 5 to 60% by mass.

(Other ingredients)
In the resin composition for the blue light cut layer, as other components, for example, a polymerization terminator, chain transfer agent, leveling agent, plasticizer, surfactant, antifoaming agent, silane coupling agent, ultraviolet absorber, adhesion promoter An agent or the like may be contained.

<Transparent substrate>
In the blue light cut film of the present invention, the transparent substrate may be appropriately selected from conventionally known transparent substrates used for optical applications, and is not particularly limited. Examples of the material used for the transparent substrate include acetyl cellulose resins such as triacetyl cellulose, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, olefin resins such as polyethylene and polymethylpentene, acrylic resins, Transparent resins such as polyurethane resin, polyether sulfone, polycarbonate, polysulfone, polyether, polyether ketone, acrylonitrile, methacrylonitrile, cycloolefin polymer, cycloolefin copolymer, glass such as soda glass, potash glass, lead glass, Examples thereof include ceramics such as PLZT, inorganic materials such as quartz and fluorite, and composite materials thereof.
The transparent substrate may be supplied in the form of a roll, may not be bent so that it can be wound, but may be bent by applying a load, or may not be bent completely, depending on the application. It can be selected appropriately.

The configuration of the transparent substrate used in the present invention is not limited to a configuration consisting of a single layer, and may have a configuration in which a plurality of layers are laminated. When it has the structure by which the several layer was laminated | stacked, the layer of the same composition may be laminated | stacked, and the several layer which has a different composition may be laminated | stacked.
In addition, an intermediate layer is formed on the base material in order to improve adhesion to the blue light cut layer, the coating properties of the resin composition for the blue light cut layer, and the surface performance of the surface such as surface smoothness. May be.

<Other layers>
The blue light cut film of this invention may have another layer in the range which does not impair the effect of this invention. Examples of the other layer include a hard coat layer, an antireflection layer, an antiglare layer, and an antistatic layer, and may have one layer or two or more layers. In the present invention, the other layers may be arranged at arbitrary positions. For example, the blue light cut layer may be disposed on the surface opposite to the transparent substrate, or the transparent substrate may be disposed on the surface opposite to the blue light cut layer. You may arrange | position between blue light cut layers.

The hard coat layer is a layer having a function of protecting the blue light cut film by increasing its hardness. The hard coat layer can be appropriately selected from conventionally known ones. As a hard-coat layer, it is preferable that it is a layer which consists of hardened | cured material of the curable resin composition for hard-coat layers. As a curable resin that can also be applied as a hard coat layer, an ionizing radiation curable resin, other known curable resins, and the like may be appropriately employed depending on required performance. Examples of the ionizing radiation curable resin include acrylate-based, oxetane-based, and silicone-based resins. For example, acrylate-based ionizing radiation curable resins include monofunctional (meth) acrylate monomers, bifunctional (meth) acrylate monomer monomers, (meth) acrylate monomers such as trifunctional or higher (meth) acrylate monomers, urethane ( It consists of (meth) acrylate ester oligomers such as (meth) acrylate, epoxy (meth) acrylate, and polyester (meth) acrylate, or (meth) acrylate prepolymers. Examples of tri- or higher functional (meth) acrylate monomers include trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like.
What is necessary is just to adjust the film thickness of a hard-coat layer suitably in the blue light cut film of this invention. Especially, it is preferable that it is 0.5-50 micrometers, and it is more preferable that it is 1-25 micrometers.

<Antireflection layer>
The antireflection layer is a layer that prevents reflection of a background due to specular reflection of extraneous light. In the present invention, the antireflection layer can be appropriately selected from conventionally known antireflection layers. For example, a material with a high refractive index and a material with a low refractive index are laminated alternately, and the outermost surface is multilayered (multi-coat) so that it becomes a low refractive index layer. It is possible to obtain an antireflection layer or the like that suppresses the reflection of the light and obtains a good antireflection effect.

<Anti-glare layer>
The antiglare layer is a layer that scatters or diffuses extraneous light. For example, extraneous light can be diffused by roughening the light incident surface. This roughening treatment includes a method of directly roughing the surface of the substrate by forming fine irregularities by a sandblasting method, an embossing method, etc., in a resin binder that hardens the surface of the substrate by radiation or heat or a combination thereof. Examples thereof include a method of providing a roughened layer with a coating film containing an inorganic filler such as silica and an organic filler such as resin particles, and a method of forming a porous film having a sea-island structure on the substrate surface. As the resin of the resin binder, a curable acrylic resin, an ionizing radiation curable resin, or the like is preferably used in the same manner as the hard coat layer because surface strength is desired as the surface layer.

<Antistatic layer>
In order to suppress static electricity of the optical film, an antistatic layer may be provided. The antistatic layer can be appropriately selected from conventionally known ones. For example, the antistatic layer can be obtained by mixing and using a known antistatic agent in the hard coat resin composition.
Specific examples of the antistatic agent include quaternary ammonium salts, pyridinium salts, various cationic compounds having cationic groups such as primary to tertiary amino groups, sulfonate groups, sulfate ester bases, and phosphate ester bases. , Anionic compounds having an anionic group such as phosphonate group, amphoteric compounds such as amino acid series and aminosulfate ester series, nonionic compounds such as amino alcohol series, glycerin series and polyethylene glycol series, and alkoxides of tin and titanium And metal chelate compounds such as acetylacetonate salts thereof, and compounds obtained by increasing the molecular weight of the compounds listed above. In addition, it has a tertiary amino group, a quaternary ammonium group, or a metal chelate portion, and has a monomer or oligomer that can be polymerized by ionizing radiation, or a polymerizable functional group that can be polymerized by ionizing radiation, and Polymerizable compounds such as organometallic compounds such as coupling agents can also be used as antistatic agents. Further, a conductive polymer or the like may be used.

<Method for producing blue light cut film>
What is necessary is just to select the manufacturing method of the blue light cut film of this invention suitably from a conventionally well-known method. Among them, it is preferable to use a wet coating method from the viewpoint of easy application of continuous production by roll-to-roll, and an increase in the area of the blue light cut film and improvement in productivity. Specific examples of the wet coating method include, for example, a dip coating method, an air knife coating method, a curtain coating method, a roll coating method, a wire bar coating method, a gravure coating method, a die coating method, a blade coating method, a micro gravure coating method, and a spray. Examples thereof include a coating method, a spin coating method, and a comma coating method.

  As a method for producing a blue light cut film using a wet coat method, for example, first, a resin for a blue light cut layer containing light diffusing particles, a color material, and a binder component on one side of a transparent resin substrate Examples thereof include a method in which the composition is applied by the wet coating method and is cured by light irradiation or heating as necessary from the binder component to form a blue light cut layer.

  In the blue light cut film of the present invention, the film thickness of the blue light cut film layer may be appropriately adjusted according to the application. From the viewpoint of efficiently shielding blue light and suppressing the yellowness of transmitted light, it is preferably 0.5 to 20 μm, and more preferably 1 to 15 μm.

Since the blue light cut film of the present invention is composed of a resin composition for a blue light cut film or a cured product thereof, the blue light cut layer contains the light diffusing particles, the specific color material, and the binder component. while cutting the blue light, since the yellowness of transmitted light can be suppressed, blue light cut film without yellowish ^{itself, L * a * b * b} * 2 defined in a color space (CIE1976) The following can be achieved:
Moreover, the blue light cut film of this invention can make yellowness (YI) 5 or less. In the present invention, the yellowness (YI) of the blue light cut film can be measured according to the measuring method described in JIS K 7373.

In the present invention, the total light transmittance in the visible light region of the blue light cut film is preferably 90% or more. Here, the total light transmittance of the blue light cut film can be measured by JIS K7361-1 (a test method for the total light transmittance of a plastic-transparent material).
The haze of the blue light cut film is not particularly limited, but is preferably 25% or less, more preferably 15% or less.

2. Display Device A display device according to the present invention includes the blue light cut film according to the present invention.
Since the display device of the present invention includes the blue light cut film according to the present invention, an image displayed while blocking the blue light is free from yellowing and can be a high-quality display device.
Examples of the display device of the present invention include, but are not limited to, a known display device provided with the blue light cut film of the present invention on the outermost surface on the observer side.

An example of the display device of the present invention will be described with reference to FIG. FIG. 2 is a schematic view showing an example of a display device according to the present invention. In the example of FIG. 2, an example of a liquid crystal display device is shown as an example of the display device 100. The liquid crystal display device usually includes a liquid crystal panel 20 and a surface light source 30. The surface light source may include a light source, a reflection plate 33, a light guide plate 34, and the like, and may have an optical film having light diffusibility on the light emission surface. In the example of FIG. 2, the LED light source part 32 provided with two or more LED light sources 31 as a light source is provided. In the display device of the present invention, since the blue light cut film 10 of the present invention is provided, the LED light source unit 32 is used in combination as a light source, so that an image displayed while blocking the blue light is yellowed. And a high-quality display device can be obtained.
The blue light cut film 10 of the present invention may be disposed at any position of the display device 100, but as shown in FIG. 2, it is preferably disposed at the outermost surface on the viewer side of the display device. .

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.

1. Evaluation of coloring material [Production Example 1: Production of test laminate A]
On a 40 μm thick triacetyl cellulose substrate (TAC substrate), a test resin composition A in which the following components were mixed was applied, irradiated with light, and a test coating film A having a thickness of 3 μm was formed. A test laminate A was obtained.
<Test Resin Composition A>
Lumogen F Violet 570 (manufactured by BASF) (hereinafter referred to as colorant A): 2.5 parts by mass Pentaerythritol triacrylate (PETA): 44.0 parts by mass Irgacure 184 (manufactured by BASF, initiator): 2. 0 parts by mass / F-555 (manufactured by DIC, leveling agent): 0.5 parts by mass / IRGANOX1010 (manufactured by BASF, antioxidant): 0.5 parts by mass / TINUVINPA 144 (manufactured by BASF, light stabilizer): 0.5 Parts by mass, methyl isobutyl ketone: 50 parts by mass

[Production Example 2: Production of test laminate B]
In Production Example 1, a test coating film having a thickness of 3 μm was prepared in the same manner as in Production Example 1 except that instead of the test resin composition A, the test resin composition B in which the following components were mixed was used. A test laminate B having B was obtained.
<Resin resin composition B>
2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole (manufactured by BASF, Tinuvin 234) (hereinafter referred to as colorant B): 2.5 parts by mass Pentaerythritol triacrylate (PETA): 44.0 parts by mass Irgacure 184: 2.0 parts by mass F-555: 0.5 parts by mass IRGANOX 1010: 0.5 parts by mass TINUVINPA 144: 0.5 parts by mass Methyl Isobutyl ketone: 50 parts by mass

[Production Example 3: Production of test laminate C]
In Production Example 1, a test coating film having a thickness of 3 μm was prepared in the same manner as in Production Example 1 except that instead of the test resin composition A, a test resin composition C in which the following components were mixed was used. A test laminate C having C was obtained.
<Resin resin composition C>
2- (5-Chloro-2-benzotriazolyl) -6-tert-butyl-p-cresol (manufactured by BASF, Tinuvin 326) (hereinafter referred to as colorant C): 2.5 parts by mass Pentaerythritol Triacrylate (PETA): 44.0 parts by mass Irgacure 184: 2.0 parts by mass F-555: 0.5 parts by mass IRGANOX 1010: 0.5 parts by mass TINUVINPA 144: 0.5 parts by mass Methyl isobutyl ketone 50 parts by mass

[Comparative Production Example 1: Production of laminate D for comparative test]
In Production Example 1, a test coating having a thickness of 3 μm was prepared in the same manner as in Production Example 1 except that instead of the test resin composition A, a comparative test resin composition D in which the following components were mixed was used. A laminate D for comparison test having a film D was obtained.
<Resin composition D for comparison test>
・ Oracet Yellow 144FE (hereinafter referred to as colorant D): 2.5 parts by mass ・ Pentaerythritol triacrylate (PETA): 44.0 parts by mass ・ Irgacure 184: 2.0 parts by mass ・ F-555: 0.5 parts by mass IRGANOX 1010: 0.5 parts by mass • TINUVINPA 144: 0.5 parts by mass • Methyl isobutyl ketone: 50 parts by mass

[Production Example 4: Production of reference laminate]
In Production Example 1, a reference coating film having a thickness of 3 μm was prepared in the same manner as in Production Example 1 except that instead of the test resin composition A, a reference resin composition in which the following components were mixed was used. A reference laminate having was obtained.
<Resin composition for reference>
Pentaerythritol triacrylate: 46.5 parts by mass Irgacure 184: 2.0 parts by mass F-555: 0.5 parts by mass IRGANOX 1010: 0.5 parts by mass TINUVINPA 144: 0.5 parts by mass Methyl isobutyl ketone: 50 parts by mass

(Test example: Measurement of transmittance)
Each of the test laminate and the reference laminate obtained in the above production example was measured using an ultraviolet-visible spectrophotometer (for example, UV-3100PC manufactured by Shimadzu Corporation), and the formulas (1) to (1) to According to the formula (4), transmittance differences ΔΤ at wavelengths of 450 nm, 400 nm, 390 nm, and 380 nm were obtained. The results are shown in Table 1.

  From the results shown in Table 1, the coloring materials A, B and C have a transmittance of 450% at 5% or less and a transmittance at 380 nm of 25% or more, and are suitable for the blue cut film of the present invention. Became clear.

2. Production of blue light cut film [Example 1: Production of blue light cut film A]
On a 40 μm thick triacetyl cellulose substrate (TAC substrate), a blue light cut layer resin composition A in which the following components are mixed is applied, irradiated with light, and a blue light cut having a thickness of 3 μm. A blue light cut film A having a layer was obtained.
<Resin Composition A for Blue Light Cut Layer>
Colorant A: 2.5 parts by mass Pentaerythritol triacrylate: 39.0 parts by mass Acrylic filler (Matsumoto Yushi Seiyaku Co., Ltd., M-201, methyl methacrylate cross-polymer, surface smooth spherical, particle size: 1 μm ): 5.0 parts by mass Irgacure 184 (manufactured by BASF, initiator): 2.0 parts by mass F-555 (manufactured by DIC, leveling agent): 0.5 parts by mass IRGANOX 1010 (manufactured by BASF, antioxidant): 0.5 parts by mass-TINUVINPA 144 (manufactured by BASF, light stabilizer): 0.5 parts by mass-Methyl isobutyl ketone: 50 parts by mass

[Example 2: Production of blue light cut film B]
In Example 1, instead of the resin composition A for blue light cut layer, the thickness was the same as in Example 1 except that the resin composition B for blue light cut layer mixed with the following components was used. Blue light cut film B having a 3 μm blue light cut layer was obtained.
<Resin Composition B for Blue Light Cut Layer>
Colorant B: 2.5 parts by mass Pentaerythritol triacrylate: 39.0 parts by mass Acrylic filler M-201: 5.0 parts by mass Irgacure 184: 2.0 parts by mass F-555: 0.5 parts by mass・ IRGANOX1010: 0.5 part by mass ・ TINUVINPA 144: 0.5 part by mass ・ Methyl isobutyl ketone: 50 part by mass

[Example 3: Production of blue light cut film C]
In Example 1, instead of the resin composition A for blue light cut layer, the thickness was the same as in Example 1 except that the resin composition C for blue light cut layer mixed with the following components was used. Blue light cut film C having a 3 μm blue light cut layer was obtained.
<Resin Composition C for Blue Light Cut Layer>
Colorant C: 2.5 parts by mass Pentaerythritol triacrylate: 39.0 parts by mass Acrylic filler M-201: 5.0 parts by mass Irgacure 184: 2.0 parts by mass F-555: 0.5 parts by mass・ IRGANOX1010: 0.5 part by mass ・ TINUVINPA 144: 0.5 part by mass ・ Methyl isobutyl ketone: 50 part by mass

[Comparative Example 1: Production of comparative blue light cut film D]
In Example 1, instead of the resin composition A for blue light cut layer, the thickness of the resin composition D for comparison blue light cut layer was mixed in the same manner as in Example 1 except that the following components were mixed. A comparative blue light cut film D having a blue light cut layer of 3 μm was obtained.
<Comparative Blue Light Cut Layer Resin Composition D>
Colorant D: 2.5 parts by mass Pentaerythritol triacrylate: 39.0 parts by mass Acrylic filler M-201: 5.0 parts by mass Irgacure 184: 2.0 parts by mass F-555: 0.5 parts by mass・ IRGANOX1010: 0.5 part by mass ・ TINUVINPA 144: 0.5 part by mass ・ Methyl isobutyl ketone: 50 part by mass

[Total light transmittance, haze measurement]
The blue light cut films of the examples and comparative examples were each made using a reflection / transmittance meter HM-150 manufactured by Murakami Color Research Laboratory Co., Ltd., with the transparent substrate side facing the light source and total light transmittance. And haze was measured.
The total light transmittance was measured according to JIS K 7361, and the haze was measured according to JIS K 7136.

[Chromaticity measurement]
The blue light cut films of Examples and Comparative Examples were measured using a spectrophotometer V-7100 manufactured by JASCO Corporation, and chromaticity and yellowness (YI) were calculated.

[Measurement of blue light shielding effect]
The transmittance (カ ッ ト) at 400 nm was measured for each of the blue light cut films of Examples and Comparative Examples and the reference laminate using a spectrophotometer V-7100 manufactured by JASCO Corporation, respectively (Τ ₀ − Ii) (%) was defined as the blue light shielding effect. Here, ⁰ is the transmittance at 400 nm of the reference laminate. The results are shown in Table 2.

[Summary of results]
As shown in the results of Table 2, Examples 1 to 3 using the color materials A to C satisfying the formulas (1) and (2) shield the blue light and suppress the yellowness of the transmitted light. It became clear that On the other hand, although the comparative example 1 using the color material D which does not satisfy | fill Formula (1) had the blue light shielding effect, it was a strong yellowish thing.

DESCRIPTION OF SYMBOLS 1 Transparent base material 2 Blue light cut layer 10 Blue light cut film 20 Liquid crystal panel 30 Surface light source 31 LED light source 32 LED light source part 33 Reflecting plate 34 Light guide plate 100 Display apparatus

Claims (5)

A blue light cut film having a blue light cut layer on at least one side of a transparent substrate,
The blue light cut layer is composed of a resin composition for a blue light cut film containing organic particles , a color material, and a binder component or a cured product thereof,
The color material is a test resin composition consisting of 5% by mass of the color material and a test binder component on one side of the test transparent substrate or a test film having a thickness of 3 μm consisting of a cured product thereof. A blue light cut film characterized by satisfying the following formulas (1) and (2) in the test laminate:
ΔΤ ₄₅₀ = − (Τ ₄₅₀ −Τ ⁰ ₄₅₀ ) ≦ 5 Formula (1)
ΔΤ ₃₈₀ = − (Τ ₃₈₀ −Τ ⁰ ₃₈₀ ) ≧ 25 Formula (2)
(In Formula (1) and Formula (2), Τ ₄₅₀ and Τ ₃₈₀ represent the transmittance (%) of light having a wavelength of 450 nm and a wavelength of 380 nm, respectively, and Τ ⁰ ₄₅₀ and Τ ⁰ ₃₈₀ are Each of the reference laminate having a reference coating film having a thickness of 3 μm and comprising a reference resin composition comprising the test binder component or a cured product thereof on the test transparent substrate has a wavelength of 450 nm and a wavelength of 380 nm. Represents light transmittance (%).)   The blue light cut film according to claim 1, wherein b * defined in the L * a * b * color space (CIE 1976) is 2 or less.   A display device comprising the blue light cut film according to claim 1. A resin composition for blue light cut film containing organic particles , a coloring material, and a binder component,
The color material is a test resin composition consisting of 5% by mass of the color material and a test binder component on one side of the test transparent substrate or a test film having a thickness of 3 μm consisting of a cured product thereof. A test laminate having a resin composition for a blue light cut film, which satisfies the following formulas (1) and (2):
ΔΤ ₄₅₀ = − (Τ ₄₅₀ −Τ ⁰ ₄₅₀ ) ≦ 5 Formula (1)
ΔΤ ₃₈₀ = − (Τ ₃₈₀ −Τ ⁰ ₃₈₀ ) ≧ 25 Formula (2)
(In Formula (1) and Formula (2), Τ ₄₅₀ and Τ ₃₈₀ represent the transmittance (%) of light having a wavelength of 450 nm and a wavelength of 380 nm, respectively, and Τ ⁰ ₄₅₀ and Τ ⁰ ₃₈₀ are The reference resin composition comprising the test binder component or the reference laminate having a thickness of 3 μm on the transparent test substrate, and a reference laminate having a wavelength of 450 nm and a wavelength of 380 nm. (Transmittance (%) is indicated.)   The resin composition for a blue light cut film according to claim 4, wherein a content ratio of the coloring material is 0.1 to 20% by mass with respect to a total solid content of the resin composition for a blue light cut layer.

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