CN116685627A - Composition for anisotropic optical film and anisotropic optical film - Google Patents
Composition for anisotropic optical film and anisotropic optical film Download PDFInfo
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- CN116685627A CN116685627A CN202180086526.4A CN202180086526A CN116685627A CN 116685627 A CN116685627 A CN 116685627A CN 202180086526 A CN202180086526 A CN 202180086526A CN 116685627 A CN116685627 A CN 116685627A
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- anisotropic optical
- optical film
- composition
- light
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/067—Polyurethanes; Polyureas
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/30—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
Abstract
The present invention provides a composition for anisotropic optical films, which can produce anisotropic optical films that can obtain good diffusivity and that are excellent in view angle expansion when used in display devices. A composition for anisotropic optical films, which comprises: (meth) acrylate having a refractive index nA of 1.50 to 1.65 and having 1 or more aromatic rings and a (meth) acryloyl group, and (C) component: a polymerization initiator, and (D) a component: the polymerization inhibitor having a structure in which a carbonyl group or a hydroxyl group is added as a substituent of the conjugated ring compound has a content of the component (C) of 0.1 to 20 parts by weight per 100 parts by weight of the nonvolatile component of the composition and a content of the component (D) of 0.001 to 1 part by weight per 100 parts by weight of the nonvolatile component of the composition.
Description
Technical Field
The present invention relates to a composition for anisotropic optical films and an anisotropic optical film produced using the composition for anisotropic optical films.
Background
Various display devices such as liquid crystal display devices (LCDs) and organic electroluminescence elements (organic ELs) may employ a light diffusion layer having anisotropy for the purpose of expanding viewing angle and the like.
As such a light diffusion layer, patent document 1 discloses a light control plate obtained by irradiating a raw material composition having a high refractive index material and a low refractive index material with ultraviolet rays and curing the same.
Patent document 2 discloses a light diffusion film which is obtained by curing a raw material composition containing a (meth) acrylate compound having an aromatic skeleton as a high refractive index material and a urethane (meth) acrylate compound containing a specific polyol compound and a polyisocyanate compound as a low refractive index material.
Prior art literature
Patent literature
Patent document 1: japanese patent No. 3211381
Patent document 2: japanese patent No. 6414883
Disclosure of Invention
Problems to be solved by the invention
Although the light diffusion layer produced from the raw material composition described in patent document 1 and patent document 2 can expand the diffusion width of light for main diffusion to some extent, a sufficiently wide diffusion width cannot be obtained, and the expansion of viewing angle when used in a display device is insufficient.
Accordingly, an object of the present invention is to provide a composition for anisotropic optical films, which can produce an anisotropic optical film that can obtain good diffusivity and is excellent in view angle expansion when used in a display device.
Means for solving the problems
The present inventors have made intensive studies and have found that the above problems can be solved by using a predetermined (meth) acrylate as a base resin component and blending the predetermined component, and have completed the present invention.
The present invention is a composition for anisotropic optical films, which is characterized by comprising the following components (A), (C) and (D); (A) A (meth) acrylate having 1 or more aromatic rings and a (meth) acryloyl group and having a refractive index nA of 1.50 to 1.65; the component (C) is a polymerization initiator; (D) The component (a) is a polymerization inhibitor having a structure in which a carbonyl group or a hydroxyl group is added as a substituent of a conjugated ring compound; the content of the component (C) is 0.1 to 20 parts by weight based on 100 parts by weight of the nonvolatile component of the composition, and the content of the component (D) is 0.001 to 1 part by weight based on 100 parts by weight of the nonvolatile component of the composition.
The constituent component may further include a component having a refractive index nB of 1.35 to 1.54 and a refractive index nB smaller than the refractive index nA as the component (B).
The component (B) may be a copolymer having a content of (meth) acrylic acid ester in the constituent monomers of 10 to 80% by weight, and the content of the component (B) may be 10 to 400 parts by weight based on 100 parts by weight of the content of the component (A).
The component (D) may be 1 or more compounds selected from the group consisting of compounds represented by the following chemical formulas (D1) to (D6);
[ chemical 1]
(in the formulae (D1) to (D6), R1 to R5 are each independently a hydrogen atom, a halogen atom, a carboxyl group or a C1-C4 alkoxy group or an alkyl group.)
The component (B) may be a thermoplastic polymer having a weight average molecular weight of 1,000 to 500,000 and a glass transition temperature of-40 ℃ or higher.
The component (B) may be a urethane (meth) acrylate having a weight average molecular weight of 3,000 to 20,000 and composed of a cyclic aliphatic compound having 2 isocyanate groups, a polyalkylene glycol, and a hydroxyalkyl (meth) acrylate.
The present invention may be an anisotropic optical film which is a cured product of the composition for an anisotropic optical film, wherein the linear transmittance, which is a ratio of the amount of transmitted light in the linear direction of incident light to the amount of incident light, varies with the incident angle of light, the anisotropic optical film has a matrix region and a plurality of columnar regions having a refractive index different from that of the matrix region, the columnar regions are configured to be oriented and extended from one surface of the anisotropic optical film to the other surface, and the aspect ratio, which is an average long diameter/an average short diameter, of the columnar regions in the surface of the anisotropic optical film is 1 to 50.
The aspect ratio may be 2 to 20.
The thickness of the anisotropic optical film may be 10 μm to 200 μm.
Effects of the invention
According to the present invention, it is possible to provide a composition for an anisotropic optical film, which can produce an anisotropic optical film that can obtain good diffusivity and is excellent in view angle expansion when used in a display device.
Drawings
Fig. 1 is a schematic diagram showing an example of an anisotropic optical film.
Fig. 2 is a plan view showing a surface structure of the anisotropic optical film.
Fig. 3 is a 3-dimensional polar display for explaining the scattering center axis of the anisotropic optical film.
Fig. 4 is a schematic diagram showing a method for measuring the diffusion performance of an anisotropic optical film.
Fig. 5 is a schematic view showing a method for producing an anisotropic optical film of the present invention including any of steps 1 to 3.
Fig. 6 is an optical distribution diagram showing the diffusion widths of the anisotropic optical films of example 1 and comparative example 1.
Detailed Description
The composition for an anisotropic optical film of the present invention, an anisotropic optical film obtained by curing the composition for an anisotropic optical film (anisotropic optical film which is a cured product of the composition for an anisotropic optical film), and the like will be described. The composition for anisotropic optical film refers to a composition for producing an anisotropic optical film.
In the following description, when an upper limit value and a lower limit value are described, all combinations of the upper limit value and the lower limit value are described in the present specification.
In the present invention, the refractive index of each component means a refractive index measured by a method according to JIS K0062.
Composition for anisotropic optical film
Component
The composition for anisotropic optical films comprises a constituent component comprising a (A) component as a (meth) acrylic acid ester, a (C) component as a polymerization initiator, and a (D) component as a polymerization inhibitor. The constituent component of the composition for anisotropic optical film preferably contains component (B) as a low refractive material. Here, in storage of the composition for an anisotropic optical film, etc., substances in which each component of the constituent components reacts with each other in a minute amount and the like are also included in the scope of the present invention.
Component (A): (meth) acrylic acid ester >
(A) The component (A) is required to be a (meth) acrylate having a high refractive index, specifically, the refractive index nA of the component (A) is 1.50 to 1.65, preferably 1.50 to 1.60, and particularly preferably 1.55 to 1.60.
By setting the refractive index of the component (a) to such a range, an anisotropic optical film excellent in diffusivity can be produced.
The component (A) is a (meth) acrylate having 1 or more aromatic rings and a (meth) acryloyl group.
(A) The number of (meth) acryloyl groups contained in the component (a) is not particularly limited, and may be 1 or 2 or more, and the upper limit is not particularly limited, but preferably 8 or less.
(A) The component preferably has a plurality of aromatic rings. The structure containing a plurality of aromatic rings preferably has a biphenyl ring structure and/or a diphenyl ether structure. Such biphenyl structures and diphenyl ether structures may have only 1 or 2 or more in the skeleton. By having such a structure, a (meth) acrylate having a very high refractive index is obtained.
The component (a) is not particularly limited, and examples thereof include a biphenyl compound represented by the following general formula (1) and a diphenyl ether compound represented by the following general formula (2).
[ chemical 2]
[ chemical 3]
In the general formula (1), R 1 ～R 10 Each independently, R 1 ～R 10 Any 1 of them is a substituent represented by the following general formula (3) or (4). The remaining (meth) acryloyl groups may be omitted, and specifically, substituents such as a hydrogen atom, a hydroxyl group, a carboxyl group, an alkyl group, an alkoxy group, a haloalkyl group, a hydroxyalkyl group, a carboxyalkyl group, and a halogen atom may be mentioned.
In the general formula (2), R is 11 ～R 20 Each of which is a single pieceIndependently, R 11 ～R 20 Any 1 of them is a substituent represented by the following general formula (3) or (4). The remaining (meth) acryloyl groups may be omitted, and specifically, substituents such as a hydrogen atom, a hydroxyl group, a carboxyl group, an alkyl group, an alkoxy group, a haloalkyl group, a hydroxyalkyl group, a carboxyalkyl group, and a halogen atom may be mentioned.
[ chemical 4]
In the general formula (3), R 21 Is a hydrogen atom or a methyl group, n is an integer of 1 to 4, and the repetition number m is an integer of 1 to 10.
[ chemical 5]
In the general formula (4), R 22 Is a hydrogen atom or a methyl group, n is an integer of 1 to 4, and the repetition number m is an integer of 1 to 10.
The number of repetition m of the substituents represented by the general formulae (3) and (4) is usually an integer of 1 to 10, more preferably an integer of 1 to 4, and still more preferably an integer of 1 to 2.
Similarly, n in the substituents represented by the general formulae (3) and (4) is usually an integer of preferably 1 to 4, more preferably an integer of 1 to 2.
Specific examples of the biphenyl compound represented by the general formula (1) include compounds represented by the following formula (5).
[ chemical 6]
As specific examples of the diphenyl ether compound represented by the above general formula (2), compounds represented by the following formula (6) are preferable.
[ chemical 7]
(A) The component may contain only 1 kind of the above-described component, or may contain a plurality of kinds.
Component (B)
(B) The component (B) is a low refractive index material having a relatively low refractive index, specifically, the refractive index nB of the component (B) is 1.35 to 1.54, preferably 1.35 or more and less than 1.50, more preferably 1.40 or more and less than 1.50, particularly preferably 1.45 or more and less than 1.50. In the present invention, the refractive index nB of the component (B) is smaller than the refractive index nA of the component (a).
(A) The difference (nA-nB) between the refractive index nA of the component and the refractive index nB of the component (B) is preferably 0.01 to 0.3, more preferably 0.03 to 0.3, particularly preferably 0.05 to 0.3.
(B) The component (c) is not particularly limited as long as the refractive index satisfies the above, and known resin materials may be used, and examples thereof include acrylic resins, styrene-acrylic copolymers, polyurethane resins, polyester resins, epoxy resins, cellulose resins, silicone resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral resins, polyvinyl alcohol resins, polyvinyl formal resins, polyvinyl acetal resins, polyvinylidene fluoride, and the like. The component (B) is preferably a copolymer, and preferably an acrylic copolymer. In this case, the content of the (meth) acrylic acid ester in the constituent monomer is more preferably 10 to 80% by weight.
(B) The component (c) is particularly preferably a urethane (meth) acrylate composed of a cyclic aliphatic compound having 2 isocyanate groups, a polyol compound (preferably a diol compound, particularly preferably a polyalkylene glycol), and a hydroxyalkyl (meth) acrylate.
Examples of the cyclic aliphatic compound having 2 isocyanate groups include alicyclic polyisocyanates such as isophorone diisocyanate (IPDI) and hydrogenated diphenylmethane diisocyanate.
Examples of the polyol compound include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and polyhexamethylene glycol, and polypropylene glycol is preferable.
Examples of the hydroxyalkyl (meth) acrylate include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate.
(B) The components can be produced by synthesizing the above components according to a conventional method.
The ratio of the amounts of the components is not particularly limited, and is preferably, for example, "a cyclic aliphatic compound having 2 isocyanate groups": "polyol compound": hydroxyalkyl (meth) acrylate "=1 to 5:1:1 to 5.
(B) The component is preferably a thermoplastic polymer. The glass transition temperature of the component (B) is preferably-40℃or higher, more preferably 0℃or higher, particularly preferably 30℃or higher. The upper limit of the glass transition temperature is not particularly limited, but is preferably 150℃or lower, for example.
The glass transition temperature can be measured by a known measuring method, for example, a method according to JIS K7121-1987 "method for measuring transition temperature of plastics".
(B) The weight average molecular weight of the component (a) is preferably 1,000 ～ 500,000, more preferably 2,000 to 50,000, and still more preferably 3,000 to 20,000.
The weight average molecular weight can be measured by a known measurement method, for example, GPC as a molecular weight in terms of polystyrene.
By setting the glass transition temperature and the weight average molecular weight of the component (B) to the above ranges, compatibility with the component (a) can be improved, and an anisotropic optical film having excellent properties can be produced. For example, it is possible to improve durability in a heat resistance test or the like, to provide an anisotropic optical film before UV curing with a proper elastic modulus, and to store the film with a roll or the like.
(B) The component may contain only 1 kind of the above-described component, or may contain a plurality of kinds. When the component (B) contains a plurality of components, the refractive index of the component (B) may be the average value of the components.
Component (C)
(C) The component is a polymerization initiator.
(C) The polymerization initiator of the component (a) is a compound that generates radical species by irradiation with active energy rays such as ultraviolet rays, and conventionally known polymerization initiators can be used.
Examples of the polymerization initiator include benzophenone, benzil, milbetone, 2-chlorothioxanthone, 2, 4-diethylthioxanthone, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2-diethoxyacetophenone, benzildimethyl ketal, 2-dimethoxy-1, 2-diphenylethane-1-one, 2-hydroxy-2-methyl-1-phenylpropane-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- [4- (methylthio) phenyl ] -2-morpholinoacetone-1, 1- [4- (2-hydroxyethoxy) -phenyl ] -2-hydroxy-2-methyl-1-propan-1-one, bis (cyclopentadienyl) -bis [2, 6-difluoro-3- (pyrrol-1-yl) phenyl ] titanium, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -1,2,4, 6-trimethylbenzoyl diphenyl phosphine oxide and the like.
These compounds may be used as each monomer, or may be used in combination of plural kinds.
The polymerization initiator may be used by directly dissolving the powder in the polymerizable compound, but in the case of poor solubility, a polymerization initiator obtained by dissolving the polymerization initiator in a solvent in advance may be used.
Component (D)
(D) The component (a) is a polymerization inhibitor having a structure in which a carbonyl group or a hydroxyl group is added as a substituent of the conjugated ring compound.
Examples of the polymerization inhibitor having the above-mentioned structure include so-called quinone-based and phenol-based polymerization inhibitors.
Specifically, the component (D) is preferably 1 or more compounds selected from the group consisting of compounds represented by the following chemical formulas (D1) to (D6).
[ chemical 8]
In the formulae (D1) to (D6), R1 to R5 are each independently a hydrogen atom, a halogen atom, a carboxyl group, or a C1 to C4 (preferably C1 to C3) alkoxy group (for example, methoxy group, ethoxy group, propoxy group) or an alkyl group (for example, methyl group, ethyl group, propyl group, or tert-butyl group).
Thus, the component (D) is preferably a polymerization inhibitor of hydroquinone (for example, formula (D1) above), quinone methide (for example, formula (D2) and formula (D4) above), benzoquinone (for example, formula (D3) above), phenol (for example, formula (D5) above), or catechol (for example, formula (D6) above). The component (D) is more preferably a hydroquinone-based, quinone methide-based or benzoquinone-based polymerization inhibitor, and particularly preferably a benzoquinone-based polymerization inhibitor.
The polymerization inhibitor may have a structure to which a carbonyl group or a hydroxyl group is added, and thus, in addition to the above-mentioned formulae (D1) to (D6), a pyrogallol-based or naphthoquinone-based polymerization inhibitor or the like may be used.
In the composition for an anisotropic optical film containing the component (a) as a high refractive material and a polymerization initiator, the composition further contains a predetermined polymerization inhibitor, whereby the growth of a structural region described later becomes appropriate, and the effect of improving optical characteristics (particularly, diffusion width) can be obtained.
Other components
As other components, various dyes, sensitizers, other known additives, and the like may be contained in order to improve photopolymerization. In addition, a solvent, a dispersion medium, and the like may be contained.
Furthermore, a heat curing initiator capable of curing the photopolymerizable compound by heating may be used in combination with the photopolymerization initiator. In this case, it is expected that the polymerization curing of the photopolymerizable compound is further promoted to completion by heating after the photocuring.
As the solvent used in preparing the composition containing the photopolymerizable compound, for example, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, and the like can be used.
If the acid generator used as the cationically polymerizable initiator remains after the composition is cured, it is considered that the acid generator may cause a problem to other members when used in a device such as a display. Therefore, as the other component, it is preferable that the acid generator is not contained. For example, the content of the acid generator in the composition is preferably 1% or less.
The content of each component
Component (A)
The content of the component (a) is not particularly limited, but is preferably 30 wt% or more, 35 wt% or more, 40 wt% or more, or 45 wt% or more, with respect to the total solid content (total amount of nonvolatile components after removal of volatile solvents) of the composition. The upper limit is not particularly limited, and is, for example, 99 wt%, 95 wt%, 90 wt%, 85 wt%, 80 wt%, 70 wt%, or 60 wt%.
Component (B)
The content of the component (B) in the composition is preferably 10 to 400 parts by weight, more preferably 25 to 200 parts by weight, and particularly preferably 50 to 100 parts by weight, based on 100 parts by weight of the component (a).
In another aspect, the content of the component (B) is preferably 10 to 80 wt%, more preferably 15 to 70 wt%, and even more preferably 20 to 60 wt% based on the total amount of the nonvolatile components (the amount after removal of the solvent and the dispersion medium) of the composition.
Component (C)
The content of the component (C) in the composition is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 15 parts by weight, particularly preferably 1 to 10 parts by weight, based on 100 parts by weight of the nonvolatile component of the composition.
In addition, from another viewpoint, the content of the component (C) is preferably 0.1 to 10% by weight, more preferably 0.5 to 8% by weight, and particularly preferably 0.8 to 5% by weight, relative to the total amount of the nonvolatile components of the composition.
Component (D)
The content of the component (D) in the composition is preferably 0.001 to 1 part by weight, more preferably 0.005 to 0.5 part by weight, still more preferably 0.008 to 0.1 part by weight, particularly preferably 0.015 to 0.05 part by weight, based on 100 parts by weight of the nonvolatile component of the composition.
In addition, from another viewpoint, the content of the component (D) in the composition is preferably 0.001 to 0.5 wt%, more preferably 0.005 to 0.1 wt%, and particularly preferably 0.01 to 0.04 wt%, with respect to the total amount of the nonvolatile components of the composition.
In the composition, the ratio indicated by [ (content of component (D)/content of component (C) ] is preferably 0.005 to 0.1, more preferably 0.01 to 0.05.
The composition for anisotropic optical films of the present invention can provide an anisotropic optical film having excellent diffusivity by setting the content of each component to the above-described range.
Anisotropic optical film
Next, preferred examples of the anisotropic optical film obtained by using the composition for anisotropic optical film will be described. When the composition for anisotropic optical films is used, anisotropic optical films other than the anisotropic optical films described below can be produced.
The "anisotropic optical film" has anisotropy and directivity in which the diffusion, transmission, and diffusion distribution of light vary with the angle of incidence of light, depending on the angle of incidence of light. Therefore, unlike a directional diffusion film, an isotropic diffusion film, and a diffusion film oriented in a specific direction, which do not depend on the angle of incident light.
When depending on the angle of incident light of the anisotropic optical film, the linear transmittance [ (percentage of the transmitted light amount in the linear direction of the incident light)/(the light amount of the incident light) ] varies with the angle of incident light of the light. That is, with respect to the incident light of the anisotropic optical film, the incident light in a predetermined angle range is mainly transmitted because of the improvement in linearity, and the incident light in other angle ranges is mainly diffused because of the improvement in diffusivity.
Structure
The anisotropic optical film of the present invention has a base region and a plurality of columnar regions having a refractive index different from that of the base region.
The "matrix region" and the "columnar regions" in the anisotropic optical film are regions formed by local differences in refractive index of the material constituting the anisotropic optical film of the present invention, and represent opposite regions having a lower or higher refractive index than the other regions. These regions are formed by phase separation when the anisotropic optical film-forming material is cured.
That is, the refractive index difference is not particularly limited as long as there is a difference in the degree to which at least a part of light incident on the anisotropic optical film is reflected at the interface between the matrix region and the columnar region.
The columnar regions included in the anisotropic optical film are generally configured to be oriented and extended from one surface to the other surface of the anisotropic optical film (see fig. 1).
Columnar region
The length of the columnar region is not particularly limited, and may be a length penetrating from one surface to the other surface of the anisotropic optical film, or may be a length not reaching from one surface to the other surface.
In the plurality of columnar regions of the anisotropic optical film, the surface shape of the anisotropic optical film may be set to have a shape with a short diameter and a long diameter.
The surface shape of the columnar region is not particularly limited, and may be, for example, circular, elliptical, or polygonal. In the case of a circle, the minor diameter is equal to the major diameter, in the case of an ellipse, the minor diameter is the length of the minor axis, and the major diameter is the length of the major axis, in the case of a polygon, the shortest length at the point 2 of the polygonal outer shape in the polygon may be taken as the minor diameter, and the longest length may be taken as the major diameter. Fig. 2 shows columnar regions as viewed from the surface direction of the anisotropic optical film. In fig. 2, LA represents a long diameter, and SA represents a short diameter.
The short diameter and long diameter of the columnar region can be measured as average values of the short diameter and long diameter of each of 20 columnar regions arbitrarily selected by observing the surface of the anisotropic optical film with an optical microscope.
The ratio of the average long diameter to the average short diameter (average long diameter/average short diameter), that is, the aspect ratio of the columnar regions is not particularly limited, and is, for example, preferably 1 to 50, more preferably 2 to 20.
Fig. 2 (a) shows an anisotropic optical film having a columnar region with an aspect ratio of 2 to 50, and fig. 2 (b) shows an anisotropic optical film having a columnar region with an aspect ratio of 1 or more and less than 2.
When the aspect ratio is 1 or more and less than 2, when light parallel to the column axis direction of the columnar region is irradiated, the transmitted light isotropically spreads (see fig. 1 (a)). On the other hand, when the aspect ratio is 2 to 50, when light parallel to the column axis direction is irradiated similarly, the light is diffused with anisotropy corresponding to the aspect ratio (see fig. 1 b).
In the case where the aspect ratio is set to 2 to 50, the diffusion becomes more anisotropic in the case where the aspect ratio is set to a range exceeding 20 and 50 or less, whereas in the case where the aspect ratio is set to a range of 2 to 20, the diffusion has intermediate properties between the case where the aspect ratio is 1 or more and less than 2 and the case where the aspect ratio is set to a range exceeding 20 and 50 or less. Thus, by dividing the range of the aspect ratio into 1 or more and less than 2, 2 to 20, more than 20 and 50 or less, anisotropic optical films each having different optical characteristics can be produced. The composition for anisotropic optical films of the present invention can be used as a preferable raw material in the production of anisotropic optical films having any aspect ratio.
The anisotropic optical film may include a plurality of columnar regions having 1 aspect ratio, or may include a plurality of columnar regions having different aspect ratios.
Scattering center axis
The "scattering center axis" of the anisotropic optical film refers to a direction in which light diffusivity coincides with an incident light angle of light having substantial symmetry with respect to the incident light angle when the incident light angle to the anisotropic optical film is changed. This is because, when the scattering center axis is inclined with respect to the normal direction of the film (the film thickness direction of the film), the optical distribution (described later) related to the light diffusivity is not strictly symmetrical.
Here, the scattering center axis is generally in parallel relation to the orientation direction (extending direction) of the columnar region. The scattering center axis is parallel to the orientation direction of the columnar region, and need not be strictly parallel as long as the refractive index law (Snell's law) is satisfied.
The scattering center axis can be confirmed by optical distribution in addition to observing the projection shape of light passing through the anisotropic optical film by observing the tilt of the column axis of the columnar region in the cross section of the anisotropic optical film by an optical microscope or changing the angle of incident light.
Snell's law is: at the light refractive index n 1 Medium refractive index n of (2) 2 In the case of interfacial incidence of the medium of (2), at an incident light angle θ thereof 1 And angle of refraction theta 2 Between n 1 sinθ 1 ＝n 2 sinθ 2 Is established. For example, if n 1 =1 (air), n 2 When the incident light angle is 30 °, the orientation direction (refraction angle) of the columnar region is about 19 °, but even if the incident light angle is different from the refraction angle, the concept of parallelism is included in the present invention as long as Snell's law is satisfied.
As described above, the scattering center axis refers to a direction in which light diffusivity coincides with an incident light angle of light having substantial symmetry with respect to the incident light angle when the incident light angle to the anisotropic optical film is changed. In this case, the scattering center axis may be set to an incident light angle (a central portion of the diffusion region, in the case of embodiment 1 of fig. 6) at a substantially central portion of the minimum value of the linear transmittance in the optical distribution (for example, fig. 6 showing the optical distribution in the embodiment) by creating an optical distribution which is a graph showing the relationship of the linear transmittance based on the incident light angle of the light to the anisotropic optical film after calculating the linear transmittance.
The optical distribution does not directly exhibit light diffusivity, but can be said to substantially exhibit light diffusivity if interpreted as an increase in diffuse transmittance due to a decrease in linear transmittance.
As shown in fig. 6, the range of the incident light angle between the extreme values of the minimum value of 2 points, which is the maximum linear transmittance, is referred to as a "diffusion region", and the other range of the incident light angle is referred to as a "non-diffusion region".
Further, in the present invention, the diffusion region is referred to as "diffusion width".
Next, the scattering center axis P of the anisotropic optical film will be described from another point of view with reference to fig. 3. Fig. 3 is a 3-dimensional polar display for explaining the scattering center axis P of the anisotropic optical film.
According to the 3-dimensional polar coordinate display as shown in fig. 3, if the surface of the anisotropic optical film is set to the xy plane and the normal to the surface of the anisotropic optical film is set to the z axis, the scattering center axis can pass through the polar angle θ and the azimuth angleTo be represented. That is, pxy in fig. 3 may be referred to as a length direction of a scattering center axis projected to the surface of the anisotropic optical film.
Here, a polar angle θ (-90 ° < θ < 90 °) formed by a normal line (z-axis shown in fig. 3) of the anisotropic optical film and the columnar region may be defined as a scattering center axis angle. In the step of photocuring the uncured resin composition layer to form the columnar region, the angle of the columnar axis direction of the columnar region can be adjusted to a desired range by changing the direction of the irradiated light.
Thickness
The thickness of the anisotropic optical film is not particularly limited, but is preferably 10 μm to 500 μm, more preferably 10 μm to 200 μm.
Method for manufacturing anisotropic optical film
Next, a method for producing an anisotropic optical film using the composition for an anisotropic optical film will be described.
First, a composition for an anisotropic optical film (hereinafter, sometimes referred to as a "photocurable resin composition") is coated on a suitable substrate such as a transparent PET film, and the substrate is formed into a sheet, and then dried as necessary to evaporate the solvent, thereby providing an uncured resin composition layer. An anisotropic optical film can be produced by irradiating the uncured resin composition layer with light.
More specifically, the step of forming an anisotropic optical film mainly includes the following steps.
(1) Procedure 1-1: a step of disposing an uncured resin composition layer on a substrate
(2) Step 1-2: a step of obtaining parallel light rays from a light source
(3) Arbitrary procedure 1-3: obtaining light having directivity
(4) Procedure 1-4: a step of curing the uncured resin composition layer
Process 1-1: process of providing uncured resin composition layer on substrate
The method of disposing the photocurable resin composition in a sheet form on the substrate as the uncured resin composition layer may be carried out by a usual coating method or printing method. Specifically, printing such as air knife coating, bar coating, blade coating, doctor blade coating, reverse coating, transfer roll coating, gravure roll coating, kiss coating, casting coating, spray coating, slot die coating, calender coating, baffle coating, dip coating, die coating, gravure printing such as gravure printing, stencil printing such as screen printing, and the like can be used. In the case of a low viscosity composition, a weir of a certain height may be provided around the base body, and the composition may be cast inside the body surrounded by the weir.
In step 1-1, in order to prevent oxygen blocking of the uncured resin composition layer, columnar regions that are characteristic of the anisotropic optical film may be efficiently formed, or a mask that is in close contact with the light irradiation side of the uncured resin composition layer to locally change the irradiation intensity of light may be laminated.
As a material of the mask, a structure in which a light-absorbing filler such as carbon is dispersed in a matrix and a part of incident light is absorbed by carbon but light in an opening portion is sufficiently transmitted is preferable. As such a base, a transparent plastic such as PET, TAC, PVAc, PVA, acrylic, polyethylene, or the like can be used; inorganic substances such as glass and quartz; the sheet containing these substrates contains a pattern for controlling the amount of ultraviolet light transmitted and a substrate of an ultraviolet light absorbing pigment.
In the case where such a mask is not used, oxygen inhibition of the uncured resin composition layer can be prevented by performing light irradiation under a nitrogen atmosphere. In addition, even if only a normal transparent film is laminated on the uncured resin composition layer, it is effective in preventing oxygen from blocking and promoting formation of columnar regions. In light irradiation through such a mask or transparent film, photopolymerization reaction corresponding to the irradiation intensity occurs in the composition containing the photopolymerizable compound, and thus a refractive index distribution is easily generated, which is effective for the production of the anisotropic optical film of the present embodiment.
Procedure 1-2: procedure of obtaining parallel rays from light source
As the light source, a short-arc ultraviolet light generating light source is generally used, and specifically, a high-pressure mercury lamp, a low-pressure mercury lamp, a metal halide lamp, a xenon lamp, or the like can be used. In this case, it is necessary to obtain light parallel to the desired scattering center axis, and such parallel light can be obtained by disposing a point light source, disposing an optical lens such as a fresnel lens for irradiating the parallel light between the point light source and the uncured resin composition layer, disposing a reflecting mirror behind the light source, and emitting light or the like in the form of a point light source in a predetermined direction.
Arbitrary procedure 1-3: step of obtaining light ray with directivity >, and method for producing the same
Any of the steps 1 to 3 is a step of obtaining a light beam having directivity by making a parallel light beam incident on a directivity diffusion element. Fig. 5 is a schematic view showing a method for producing an anisotropic optical film of the present invention including any of steps 1 to 3.
The directivity diffusion elements 11 and 12 used in any of the steps 1 to 3 may impart directivity to the parallel light rays a incident from the light source 10.
Fig. 5 shows that light (B1 or B2) having directivity is incident on the uncured resin composition layer 1 so as to be largely diffused in the x direction and hardly diffused in the y direction. In order to obtain such light having directivity, for example, a method may be employed in which needle-like fillers having a high aspect ratio are contained in the directivity diffusion elements 11 and 12, and the needle-like fillers are oriented so that the long axis direction extends in the y direction. The directional diffusion elements 11 and 12 may be formed by various methods other than the needle-like filler.
Here, the aspect ratio of the light having directivity is preferably 2 to 50. A columnar region having an aspect ratio substantially corresponding to the aspect ratio may be formed.
In any of the steps 1 to 3, the size (aspect ratio, short diameter SA, long diameter LA, etc.) of the columnar region to be formed can be appropriately determined by adjusting the diffusion of light having directivity. For example, in any of fig. 5 (a) and (b), an anisotropic optical film of the present embodiment can be obtained. In fig. 5 (a) and (B), the spread of light having directivity is larger (B1) in (a) and smaller (B2) in (B). The size of the columnar region differs depending on the size of the spread of light having directivity.
The spread of light having directivity mainly depends on the distance of the kind of the directional diffusion elements 11 and 12 from the uncured resin composition layer 1. As the distance becomes shorter, the size of the columnar region becomes smaller, and as the distance becomes longer, the size of the columnar region becomes larger. Therefore, by adjusting the distance, the size of the columnar region can be adjusted.
Process 1-4: process for curing uncured resin composition layer
The light beam for curing the uncured resin composition layer by irradiating the uncured resin composition layer needs to include a wavelength capable of curing the photopolymerizable compound, and light having a wavelength of 365nm as a center is generally used by a mercury lamp. When an anisotropic optical film is produced using this wavelength band, the light intensity is used as illuminancePreferably 0.01mW/cm 2 ～100mW/cm 2 More preferably 0.1mW/cm 2 ～20mW/cm 2 . This is because if the illuminance is less than 0.01mW/cm 2 The curing takes a long time, and therefore the productivity becomes poor, and if it exceeds 100mW/cm 2 The photopolymerizable compound cures too rapidly to avoid formation of a structure, and thus fails to exhibit the target optical characteristics.
The irradiation time of light is not particularly limited, but is preferably 10 seconds to 180 seconds, more preferably 30 seconds to 120 seconds. By irradiating the light beam, the anisotropic optical film of the present embodiment can be obtained.
As described above, the anisotropic optical film can be obtained by irradiating light of low illuminance for a long period of time, thereby forming a specific internal structure in the uncured resin composition layer. Therefore, only by such light irradiation, unreacted monomer components remain, and tackiness may occur, which may cause problems in terms of handling and durability. In such a case, 1000mW/cm of irradiation may be additionally performed 2 The residual monomer is polymerized by the above high illuminance light. The light irradiation may be performed from the opposite side of the side where the mask is stacked.
As described above, when the uncured resin composition layer is cured, the angle of light irradiated to the uncured resin composition layer can be adjusted so that the scattering center axis of the obtained anisotropic optical film becomes a desired value.
The anisotropic optical film may further have other layers (adhesive layer, functional layer, transparent film layer, etc.).
Use of anisotropic optical film
The anisotropic optical film is excellent in viewing angle dependence improving effect, and therefore can be applied to all display devices such as a liquid crystal display device, an organic EL display device, and a plasma display device. In addition, when the anisotropic optical film is used in a reflective liquid crystal display device, an effect of improving the reflection luminance in a specific direction can be expected. The anisotropic optical film can be applied to lighting devices, building materials, and the like.
Examples
Next, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples.
(production of anisotropic optical film)
The anisotropic optical film of the present invention and the anisotropic optical film of the comparative example were produced according to the following methods.
Example 1
Preparation of composition solution 1 for anisotropic optical film
The following respective materials were mixed and stirred in the following blending amounts, thereby obtaining a composition solution 1 for anisotropic optical films.
Component (A)
M-phenoxy benzyl acrylate
Refractive index: 1.57
55 parts by weight
Component (B)
Copolymers of polymethyl methacrylate (PMMA) and polybutyl acetate (copolymers with 50% of (meth) acrylic acid esters)
Refractive index: 1.48
Weight average molecular weight: 37000
Glass transition temperature: -30 DEG C
45 parts by weight
Component (C)
2, 2-dimethoxy-2-phenylethanone (trade name: omnirad 651, manufactured by IGM Resins B.V. Co., ltd.)
(when the nonvolatile content of the composition is 100 parts by weight), 1.3 parts by weight
Component (D)
2, 5-Di-tert-butyl-1, 4-benzoquinone (DBBQ) (polymerization inhibitor of benzoquinone series, manufactured by Tokyo chemical industry Co., ltd.)
(when the nonvolatile content of the composition is 100 parts by weight), 0.02 parts by weight
< solvent >
Butyl acetate
71 parts by weight
Production of composition 1 for anisotropic optical film
The obtained composition solution 1 for an anisotropic optical diffusion film was applied to a PET film (trade name: a4300, manufactured by eastern spinning corporation) having a thickness of 100 μm using an applicator, and the coating film was dried in a clean oven set to a temperature of 80 ℃ in a drying oven, whereby a composition 1 for an anisotropic optical film having a film thickness of 50 μm was obtained.
Production of anisotropic optical film 1
Next, a polyvinyl alcohol film (hereinafter, referred to as PVA mask) in which carbon is uniformly dispersed was laminated on the surface of the anisotropic optical film composition 1, which was not in contact with the PET film, using a laminator. The obtained laminate was heated to 70℃and, while keeping the temperature constant, parallel light rays emitted from an irradiation unit for falling (manufactured by Hamamatsu Photonics Co., ltd.: L2859-01) were converted from a PVA mask surface into linear light rays via a directional diffusion element having an aspect ratio of 5, to irradiate an intensity of 2mW/cm 2 Irradiation was performed for 30 seconds. At this time, the angle of the irradiation light is irradiated in a direction inclined by 11.5 ° from the normal direction of the anisotropic optical film composition 1 in a direction (hereinafter referred to as MD direction) orthogonal to the direction in which the light is diffused by the directional diffusion element and the thickness direction of the anisotropic optical film composition 1, respectively.
The PVA mask and the PET film were peeled off from the obtained laminate to obtain an anisotropic optical film 1 of example 1.
Example 2
An anisotropic optical film 2 of example 2 was obtained in the same manner as in example 1, except that the component (D) was changed to 0.01 part by weight of 2, 5-di-t-butyl-1, 4-benzoquinone (DBBQ) (tokyo chemical industry co., ltd.) in the compounding of example 1.
Example 3
An anisotropic optical film 3 of example 3 was obtained in the same manner as in example 1, except that the component (D) was changed to 0.006 parts by weight of 2, 5-di-t-butyl-1, 4-benzoquinone (DBBQ) (tokyo chemical industry co., ltd.) in the compounding of example 1.
Example 4
An anisotropic optical film 4 of example 4 was obtained in the same manner as in example 1, except that the component (D) was changed to 0.02 parts by weight of tetramethyl-1, 4-benzoquinone (TMBQ) (tokyo chemical industry co., ltd.) in the compounding of example 1.
Example 5
An anisotropic optical film 5 of example 5 was obtained in the same manner as in example 1, except that the component (D) was changed to 0.01 part by weight of tetramethyl-1, 4-benzoquinone (TMBQ) (tokyo chemical industry co., ltd.) in the compounding of example 1.
Example 6
An anisotropic optical film 6 of example 6 was obtained in the same manner as in example 1, except that the component (D) was changed to 0.01 parts by weight of Methyl Hydroquinone (MHQ) (tokyo chemical industry co., ltd.) in the compounding of example 1.
Example 7
An anisotropic optical film 7 of example 7 was obtained in the same manner as in example 1, except that the component (D) was changed to 0.1 part by weight of 2, 5-di-t-butyl-1, 4-hydroquinone (DBHQ) (tokyo chemical industry co., ltd.) in the compounding of example 1.
Example 8
An anisotropic optical film 8 of example 8 was obtained in the same manner as in example 1, except that the component (D) was changed to 0.06 parts by weight of IrgastabUV22 (BASF Japan co.) in the compounding of example 1. IrgastabUV22 is a mixture of p-quinone methide and o-quinone methide.
Example 9
An anisotropic optical film 9 of example 9 was obtained in the same manner as in example 1, except that the linear light was converted to light rays via a directional diffusion element having a light ray aspect ratio of less than 2 and the heating temperature was changed to 50 ℃.
Example 10
An anisotropic optical film 10 of example 10 was obtained in the same manner as in example 1, except that the linear light was converted into light rays via a directional diffusion element having a light ray aspect ratio of 10 at the time of production of the anisotropic optical film 1.
Example 11
An anisotropic optical film 11 of example 11 was obtained in the same manner as in example 1, except that the linear light was converted into light rays via a directional diffusion element having a light ray aspect ratio of 30 at the time of production of the anisotropic optical film 1.
Example 12
An anisotropic optical film 12 of example 12 was obtained in the same manner as in example 1, except that the component (a) was changed to 2-hydroxy-3-phenoxypropyl acrylate (refractive index: 1.52) in the compounding of example 1.
Example 13
An anisotropic optical film 13 of example 13 was obtained in the same manner as in example 1, except that the component (B) was changed to an acrylic block copolymer (a copolymer having 20% of (meth) acrylic acid ester) in the compounding of example 1.
Component (B)
Refractive index: 1.44
Weight average molecular weight: 43,000
Glass transition temperature: -30 DEG C
Example 14
An anisotropic optical film 14 of example 14 was obtained in the same manner as in example 1, except that the component (B) was changed to a thermoplastic polymer (polyvinyl acetate) in the compounding of example 1.
Component (B)
Refractive index: 1.46
Weight average molecular weight: 200,000
Glass transition temperature: 40 DEG C
Example 15
An anisotropic optical film 15 of example 15 was obtained in the same manner as in example 1, except that the component (B) was changed to urethane (meth) acrylate (a copolymer having a (meth) acrylate content of 40% by weight in the constituent monomers) composed of polypropylene glycol (PPG), isophorone diisocyanate (IPDI) and 2-hydroxyethyl methacrylate (HEMA) in the compounding of example 1.
Component (B)
Refractive index: 1.46
Weight average molecular weight: 10,000
Example 16
An anisotropic optical film 16 of example 16 was obtained in the same manner as in example 1, except that the component (B) was removed from the mixture of example 1.
Comparative examples 1 to 16
Anisotropic optical films 1 to 16 for comparison of comparative examples 1 to 16 were obtained in the same manner as in examples 1 to 16, except that the component (D) was not added.
The types of the component (D) and the content of the component (D) in 100 parts by weight based on the nonvolatile content of the composition in each example are summarized in Table 1.
TABLE 1
(evaluation method)
The anisotropic optical films of the examples of the present invention and the comparative examples manufactured as described above were evaluated as follows.
[ evaluation of light diffusivity ]
Light diffusivity was evaluated using the diffusion width. The diffusion width was determined by the following method.
The light diffusivity of the anisotropic optical films of examples and comparative examples was evaluated using a goniophotometer (manufactured by Genecia) capable of arbitrarily changing the light-receiving angle of the detector and the light-projecting angle of the light source as shown in fig. 4. As shown in fig. 4, the anisotropic optical films (sample 3) of the examples and the comparative examples were arranged between the light source 1 and the detector 2 (here, the light source 1 and the detector 2 were fixed in advance, respectively). In this evaluation, the incidence angle of the irradiation light I from the light source 1 from the normal direction of the anisotropic optical film (sample 3) was set to 0 °, and the anisotropic optical film (sample 3) was disposed so as to be rotatable about the TD direction shown in fig. 1 as a central axis.
Next, the anisotropic optical films (sample 3) of examples and comparative examples were continuously rotated every 1 ° in the range of-75 ° to 75 °, and the amounts of light transmitted in the straight direction (straight transmitted light amounts) of light at the respective incident light angles were measured. The measurement of the linear transmitted light amount can be obtained by measuring the wavelength in the visible light range using a visibility filter. Then, the ratio of the amount of linear transmitted light to the amount of linear transmitted light (the amount of incident light ) directly irradiated from the light source 1 to the detector 2 without passing through the anisotropic optical film (sample 3) was set to the linear transmittance (%).
As a result of the above measurement, an optical distribution is obtained from the obtained data, and a maximum value (maximum linear transmittance) and a minimum value (minimum linear transmittance) of the linear transmittance are obtained based on the optical distribution.
In this case, regarding the diffusion width, the linear transmittance is obtained as an angle difference between the minimum values of the two points, in which the linear transmittance is a ratio of the linear transmitted light amount to the incident light amount of the anisotropic optical film.
Here, in the optical distribution, the normal direction of the anisotropic optical film is set to 0 °, and the incident light angle is represented by the negative direction and the positive direction. Therefore, there are cases where the incident light angle has a negative value.
Therefore, when the values of the 2 incident light angles are "positive incident light angle value and negative incident light angle value", the "sum of the absolute value of the negative incident light angle value and the positive incident light angle value" is set as the angular range of the incident light angle, that is, the diffusion width.
When the values of the 2 incident light angles are "positive", the "difference obtained by subtracting the smaller value from the larger value" is set as the diffusion width, which is the angular range of the incident light angle.
Further, when the values of the 2 incident light angles are "negative", the "difference obtained by subtracting the smaller value from the larger value by taking the absolute value of each of the values" is set as the angular range of the incident light angle, that is, the diffusion width.
[ measurement of aspect ratio of columnar region (surface observation of Anisotropic light diffusion layer) ]
The surfaces (ultraviolet irradiation side at the time of production) of the anisotropic optical films of examples and comparative examples were observed with an optical microscope, and the long diameter LA and the short diameter SA of each of the plurality of columnar regions were measured for any 20 columnar regions. The average value of the measured long diameter LA and short diameter SA was calculated, and the average long diameter LA/average short diameter SA was calculated as the aspect ratio of the columnar region.
[ evaluation criterion ]
Comparative anisotropic optical films 1 to 16 of comparative examples were produced in the same manner as in examples except that the component (D) was not added to the composition, and the difference between the diffusion widths of the comparative anisotropic optical films 1 to 16 of comparative examples and the diffusion width of the anisotropic optical films 1 to 16 of examples, which is the difference in presence or absence of the component (D), was calculated for each example, and evaluated according to the following evaluation criteria.
And (3) the following materials: the diffusivity is very excellent by more than 10 DEG
And (2) the following steps: excellent in diffusivity of 5 DEG or more and less than 10 DEG
Delta: the diffusivity is more than 0 DEG and less than 5 DEG, which is practically no problem
X: is insufficient in diffusivity of less than 0 DEG
The evaluation results of the anisotropic optical film of the present invention are shown in table 2. Fig. 6 shows an optical distribution diagram of the diffusion width of the anisotropic optical films of example 1 and comparative example 1.
TABLE 2
From examples 1 to 16 of table 2, it was confirmed that the anisotropic optical film of the present invention was excellent in diffusivity.
Examples 1 to 3 used benzoquinone-based (D) component, and the smaller the amount of the (D) component added, the smaller the difference in diffusion width, but all of them were excellent in diffusivity, and in particular, example 3 in which the content of the (D) component was 0.006 parts by weight, also an anisotropic optical film having excellent diffusivity was obtained.
Further, fig. 6 shows the optical distributions of example 1, in which the difference in diffusion width is largest and the diffusion width is also wide, and comparative example 1, in which the (D) component is not added to example 1. As can be seen from fig. 6, the anisotropic optical film of the present invention has a significantly increased diffusion width compared to the case where the (D) component is not contained in the composition.
In examples 4 and 5, the benzoquinone-based (D) component was used, and the difference in diffusion width was smaller as the amount of the (D) component added was smaller, but all of them were excellent in diffusivity, and in particular, example 4 gave an anisotropic optical film having very excellent diffusivity.
Examples 6 and 7 used hydroquinone-based (D) component, and all of them were excellent in diffusivity, and in particular example 7 gave anisotropic optical films having very excellent diffusivity.
In example 8, using the quinone component (D), an anisotropic optical film having very excellent diffusivity was obtained.
Examples 9 to 11 are different in aspect ratio from example 1, but even if the aspect ratio is changed, all of examples 9 to 11 of the present invention are excellent in diffusivity, and particularly examples 9 and 10 can give anisotropic optical films having very excellent diffusivity.
In example 12, the component (a) having a different type and refractive index from those in example 1 was used, but an anisotropic optical film having very excellent diffusivity was obtained.
Examples 13 and 15 used a copolymer (B) having a different refractive index and (meth) acrylate content than example 1, but an anisotropic optical film having very excellent diffusivity was obtained.
In example 14, the component (B) of the thermoplastic polymer having a different type and refractive index was used as compared with example 1, but an anisotropic optical film having very excellent diffusivity was obtained.
In example 16, the component (B) was not contained in example 1, but an anisotropic optical film having excellent diffusivity was obtained.
From the results of the evaluation of examples, it is clear that when the composition for an anisotropic optical film of the present invention is photocured to produce an anisotropic optical film, an anisotropic optical film having a wide diffusion width and excellent diffusion performance can be produced.
The preferred embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above embodiments. That is, other aspects and various modifications which can be conceived by those skilled in the art within the scope of the invention described in the claims are also understood to fall within the technical scope of the invention.
Symbol description
1: uncured resin composition layer
10: light source
11. 12: directional diffusion element
LA: long diameter
SA: short diameter
A: parallel light rays
B1 and B2: light having directivity.
Claims (9)
1. A composition for anisotropic optical films, characterized by comprising the following components,
the composition comprises the following components:
(meth) acrylic acid esters having 1 or more aromatic rings and (meth) acryloyl groups and having a refractive index nA of 1.50 to 1.65 as the component (A),
A polymerization initiator as component (C), and
a polymerization inhibitor having a structure in which a carbonyl group or a hydroxyl group is added as a substituent of the conjugated ring compound as the component (D);
among the constituent components of the composition,
the content of the component (C) is 0.1 to 20 parts by weight based on 100 parts by weight of the nonvolatile component of the composition,
the content of the component (D) is 0.001 to 1 part by weight based on 100 parts by weight of the nonvolatile component of the composition.
2. The composition for anisotropic optical films according to claim 1, wherein the constituent component further comprises a component having a refractive index nB of 1.35 to 1.54 and the refractive index nB being smaller than the refractive index nA as component (B).
3. The composition for anisotropic optical film according to claim 2, wherein,
the component (B) is a copolymer having a content of (meth) acrylic acid ester in the constituent monomers of 10 to 80 wt%,
among the constituent components of the composition,
the content of the component (B) is 10 to 400 parts by weight based on 100 parts by weight of the component (A).
4. The composition for anisotropic optical film according to any of claims 1 to 3, wherein the component (D) is 1 or more compounds selected from the group consisting of compounds represented by the following chemical formulas (D1) to (D6);
[ chemical 1]
In the formulae (D1) to (D6), R1 to R5 are each independently a hydrogen atom, a halogen atom, a carboxyl group or a C1 to C4 alkoxy group or an alkyl group.
5. The composition for anisotropic optical film according to any of claims 2 to 4, wherein the component (B) is a thermoplastic polymer having a weight average molecular weight of 1,000 ～ 500,000 and a glass transition temperature of-40 ℃ or higher.
6. The composition for anisotropic optical film according to any of claims 2 to 5, wherein the component (B) is a urethane (meth) acrylate having a weight average molecular weight of 3,000 to 20,000 and composed of a cyclic aliphatic compound having 2 isocyanate groups, a polyalkylene glycol and a hydroxyalkyl (meth) acrylate.
7. An anisotropic optical film, which is a cured product of the composition for anisotropic optical films according to any one of claims 1 to 6, wherein the linear transmittance, which is a ratio of the amount of transmitted light in the linear direction of incident light to the amount of incident light, varies with the incident angle of light,
the anisotropic optical film has a base region and a plurality of columnar regions having a refractive index different from that of the base region,
the columnar region is configured to be oriented and extended from one surface to the other surface of the anisotropic optical film,
The average long diameter/average short diameter, i.e., aspect ratio of the columnar regions in the surface of the anisotropic optical film is 1 to 50.
8. An anisotropic optical film according to claim 7, wherein the aspect ratio is 2 to 20.
9. An anisotropic optical film according to claim 7 or 8, wherein the thickness of the anisotropic optical film is 10 μm to 200 μm.
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