KR20120067290A - Composition for anisotropic light diffusion film and anisotropic light diffusion film - Google Patents

Abstract

PURPOSE: An anisotropic light-diffusing film composition is provided to obtain an anisotropic-diffusion film having better incident angle dependency, and wider photo-diffusing incident angle region. CONSTITUTION: An anisotropic light-diffusing film composition comprises: (meth)acrylic acid ester containing a plurality of aromatic rings, urethane(meth)acrylate of which weight average molecular weight is 3,000-20,000. The urethane(meth)acrylate is originated from following (a)-(c) components, and consists of (a)component:(b)component:(c)component with the molar ratio of 1-5:1:1-5. The content of (a) component is 25-400 parts by weight based on 100.0 parts by weight of urethane(meth)acrylate. (a) a compound containing two isocyanate groups through aliphatic ring; (b) polyalkylene glycol; and (c) hydroxyalkyl(meth)acrylate.

Description

Composition for anisotropic light-diffusion film and anisotropic light-diffusion film {COMPOSITION FOR ANISOTROPIC LIGHT DIFFUSION FILM AND ANISOTROPIC LIGHT DIFFUSION FILM}

This invention relates to the composition for anisotropic light-diffusion films, and an anisotropic light-diffusion film.

In particular, it is related with the composition for anisotropic light-diffusion films in which anisotropic light-diffusion film which has favorable incidence angle dependence in transmission and diffusion of light, and which has a wide light-diffusion incidence angle region is obtained, and an anisotropic light-diffusion film formed by photocuring it. .

Conventionally, in a liquid crystal display device, it is possible to recognize a predetermined image by using light emitted from a light source (internal light source) provided inside the device.

However, in recent years, with the spread of mobile phones, in-vehicle televisions, and the like, opportunities for viewing liquid crystal display screens are increasing outdoors. As a result, the light intensity from the internal light source lags behind the external light, and the predetermined screens are removed. The problem that it becomes difficult to recognize has arisen.

In addition, in mobile applications such as cellular phones, since the power consumption by the internal light source of the liquid crystal display device has a large ratio with respect to the total power consumption, when the internal light source is extensively used, There is a problem that the duration becomes short.

Thus, in order to solve these problems, a reflective liquid crystal display device using external light as part of a light source has been developed.

In such a reflective liquid crystal display device, since external light is used as a part of the light source, the stronger the external light, the clearer the image can be recognized, and the power consumption of the internal light source can be effectively suppressed.

Further, in such a reflective liquid crystal display device, in order to efficiently transmit external light and absorb the light into the inside of the liquid crystal display device, and to effectively use the external light as a part of the light source, the light is diffused efficiently. What is provided with the anisotropic light-diffusion film for this is proposed (for example, patent document 1).

More specifically, in Patent Document 1, as shown in FIGS. 10A to 10B, a liquid crystal cell in which a liquid crystal layer 1105 is sandwiched between an upper substrate 1103 and a lower substrate 1107. And a light reflection plate 1110 provided on the side of the lower substrate 1107, and a light control panel (anisotropic light diffusion film) 1108 provided between the liquid crystal layer 1105 and the light reflection plate 1110 ( 1112 is disclosed.

In addition, a light control panel 1108 is provided for selectively scattering light incident at a predetermined angle and transmitting light incident at an angle other than the predetermined angle, and the light control panel 1108 is incident at a predetermined angle. The scattering axis direction 1121, which projects the direction of selectively scattering light onto the surface of the optical control panel 1108, is disposed in the liquid crystal cell so that the direction of the 6 o'clock direction is within the liquid crystal cell plane.

Moreover, although various aspects are known as an anisotropic light-diffusion film used for a reflection type liquid crystal display device, in particular, in the film surface direction, the elongate plate-shaped high refractive index area | region and the elongate plate-shaped low refractive index area | region are arranged in parallel with each other. Thereby, the anisotropic light-diffusion film provided with the louver structure which can control a light direction or adjust light dispersibility in a film is used widely (for example, patent documents 2-4).

That is, Patent Document 2 obtains a film-like composition containing a plurality of compounds having a polymerizable carbon-carbon double bond by irradiating ultraviolet rays from a specific direction, curing the composition, and incident light having a specific angle range. In the light control film (anisotropic light-diffusion film) which selectively scatters bay, the at least 1 sort (s) of compound contained in the composition is a compound which has a some aromatic ring and one polymeric carbon-carbon double bond in a molecule | numerator. A light control film is disclosed.

Patent Literature 3 also discloses a fluorene-based compound (A) having a polymerizable carbon-carbon double bond in a molecule, a cationically polymerizable compound (B) having a different refractive index from the fluorene-based compound (A), and photocationic polymerization. Disclosed is a photocurable composition comprising an initiator (C) and a light control film made by curing the same.

Furthermore, Patent Document 4 contains at least one or more ethylenically unsaturated bonds in at least a bisphenol-A epoxy resin or a brominated bisphenol-A epoxy resin represented by (A) General Formula (5) and (B) structural units. The composition for anisotropic light-diffusion film which consists of a compound which has radical polymerizability, (D) photoinitiator which generate | occur | produces a radical species by actinic radiation, and (E) thermal polymerization initiator which generate | occur | produces a cationic species by heat, An anisotropic light diffusing film produced is disclosed. More specifically, at room temperature, (B) the refractive index of the compound having radical polymerizability has (A) a bisphenol A type epoxy resin or a brominated bisphenol A type epoxy resin and (C) a molecule having at least one cationically polymerizable group. The composition for anisotropic light-diffusion films characterized by being lower than a compound, and the anisotropic light-diffusion film manufactured using the same are disclosed.

(In General Formula (5), R represents a hydrogen atom or a bromine atom, and the repeating number p represents a natural number.)

Japanese Patent No. 3480260 (Patent Claims) Japanese Patent Laid-Open No. 2006-350290 (Patent Claims) Japanese Patent Laid-Open No. 2008-239757 (Patent Claims) Japanese Patent No. 3829601 (Patent Claims)

However, the anisotropic light diffusing film disclosed in Patent Literatures 1 to 4 not only lacks the incidence angle dependence in light transmission and diffusion, but also has a narrow light diffusing incidence angle region, so that external light is efficiently reflected in the liquid crystal display device. It was difficult to use as.

In addition, attempts have been made to laminate a plurality of anisotropic light diffusing films to widen the light diffusion incident angle region, but the sharpness of the image is lowered, the iris color (moire phenomenon) appears, or further, it is economically disadvantageous. A problem was found.

Moreover, when laminating a some anisotropic light-diffusion film, there also existed a cost problem.

Therefore, in view of the above circumstances, the inventors of the present invention have made efforts to make a urethane having a (meth) acrylic acid ester containing a plurality of aromatic rings and a predetermined constituent component and having a predetermined weight average molecular weight. After mix | blending (meth) acrylate in a predetermined ratio, it discovers that the anisotropic light-diffusion film which has favorable incidence angle dependence can be obtained by photocuring, and completed this invention.

That is, an object of the present invention is to provide an anisotropic light-diffusion film in which an anisotropic light-diffusion film having a wide light-diffusing incidence angle region is obtained, while having good incidence angle dependence in light transmission and diffusion, and anisotropy formed by photocuring it It is to provide a light-diffusion film.

According to this invention, it is anisotropic containing (meth) acrylic acid ester containing the some aromatic ring as (A) component, and the urethane (meth) acrylate whose weight average molecular weight as (B) component is a value within the range of 3,000-20,000. As a composition for light-diffusion films, urethane (meth) acrylate as (B) component originates in the following (a)-(c) component as a structural component, and also in a molar ratio (a) component: (b) component: (c) component = 1: 5: 1: 1-5 While it is a compound comprised, the content for (A) component is made into the value within the range of 25-400 weight part with respect to 100 weight part of (B) components, The composition for anisotropic light-diffusion films is provided, You can solve the problem.

(a) Compounds containing two isocyanate groups via aliphatic rings

(b) polyalkylene glycol

(c) hydroxyalkyl (meth) acrylate

That is, the urethane (meth) acrylate which consists of (meth) acrylic acid ester containing the some aromatic ring as (A) component, and the predetermined structural component as (B) component, and has a predetermined weight average molecular weight Since it mix | blends in predetermined range, respectively, predetermined | prescribed difference is produced in the superposition | polymerization rate (for example, radical photopolymerization rate) of each component, and it suppresses the copolymerization of both components uniformly, More specifically, And compatibility with (A) component and (B) component fall to predetermined range, and it is estimated that copolymerization property of both components falls.

Therefore, at the time of photocuring, the hardened | cured material of (A) component and the hardened | cured material of (B) component are mutually arrange | positioned, and a thin long plate-shaped high refractive index area | region and a thin elongate plate shape are arranged in a film surface direction. It is possible to efficiently form a louver structure in which the low refractive index regions are arranged in parallel with each other.

Therefore, with the composition for anisotropic light-diffusion films of this invention, while having favorable incidence angle dependence in light transmission and diffusion, an anisotropic light-diffusion film with a wide light-diffusion incidence angle region can be obtained.

In addition, in this invention, a "film surface direction" shall mean the x-y plane direction in the case where the film thickness direction is made into the y-axis.

In addition, in this invention, a "light-diffusion incident angle area | region" means the angle range of incident light corresponding to outgoing diffused light, when the angle of incident light from a point light source is changed with respect to an anisotropic light-diffusion film. do. The detail of this light-diffusion incident angle area | region is mentioned later.

In addition, "good incidence angle dependence" means that the distinction between the incident angle region (light diffusion incident angle region) with respect to the film where light diffusion of incident light occurs and the other incident angle region where light diffusion does not occur clearly It means to be controlled.

Furthermore, also in the meaning of "anisotropy" in this invention, it mentions later.

Moreover, in forming the composition for anisotropic light-diffusion films of this invention, it is preferable to contain (A) component independently as a monomer component, and to contain (B) component independently as an oligomer component.

By configuring in this way, the irregularity of each refractive index in the plate-shaped area | region derived from (A) component in a louver structure, and the plate-shaped area | region derived from (B) component is suppressed effectively, and the predetermined louver structure is provided. An anisotropic light-diffusion film can be obtained more efficiently.

Moreover, when constructing the composition for anisotropic light-diffusion films of this invention, it is preferable that (c) component as a structural component of (B) component is hydroxyalkyl methacrylate.

In this way, compared with (A) component, the polymerization rate of (B) component is further reduced, the copolymerizability of (A) component and (B) component is reduced more effectively, and the anisotropy provided with the predetermined louver structure is provided. It is estimated that a light-diffusion film can be obtained more efficiently.

Moreover, in forming the composition for anisotropic light-diffusion films of this invention, it is preferable to make refractive index of (B) component into the value within the range of 1.4-1.5.

By configuring in this way, the difference between the refractive index of the plate-shaped area | region derived from (A) component in a louver structure, and the refractive index of the plate-shaped area | region derived from (B) component is adjusted more easily, and a predetermined louver structure is adjusted. The anisotropic light-diffusion film provided can be obtained more efficiently.

In addition, the refractive index of (B) component here means the refractive index of (B) component before hardening according to light irradiation.

Moreover, in forming the composition for anisotropic light-diffusion films of this invention, it is preferable that (A) component contains a biphenyl ring as a some aromatic ring.

By configuring in this way, the polymerization rate of (A) component is accelerated, the copolymerization of (A) component and (B) component is prevented more effectively, and the anisotropic light-diffusion film provided with the predetermined louver structure is obtained more efficiently. Can be.

Moreover, in forming the composition for anisotropic light-diffusion films of this invention, it is preferable to make the weight average molecular weight of (A) component into the value within the range of 200-2500.

By configuring in this way, the polymerization rate of (A) component is made faster, the copolymerizability of (A) component and (B) component is reduced more effectively, and the anisotropic light-diffusion film provided with a predetermined louver structure is more efficient. Is estimated to be obtained.

Moreover, in forming the composition for anisotropic light-diffusion films of this invention, it is preferable to make refractive index of (A) component into the value within the range of 1.5-1.65.

By configuring in this way, the difference between the refractive index of the plate-shaped area | region derived from (A) component in a louver structure, and the refractive index of the plate-shaped area | region derived from (B) component is adjusted more easily, and a predetermined louver structure is adjusted. The anisotropic light-diffusion film provided can be obtained more efficiently.

In addition, the refractive index of (A) component here means the refractive index of (A) component before hardening according to light irradiation.

Moreover, in constructing the composition for anisotropic light-diffusion films of this invention, while containing a photoinitiator as (C) component, the content is the total amount (100 weight%) of (A) component and (B) component. It is preferable to set it as the value within the range of 0.2-20 weight% with respect to.

When comprised in this way, when irradiating an active energy ray with respect to the composition for anisotropic light-diffusion films, a predetermined louver structure can be formed efficiently.

Moreover, another aspect of this invention WHEREIN: The anisotropic light-diffusion film formed by irradiating an active energy ray with respect to the composition for anisotropic light-diffusion films, The composition for anisotropic light-diffusion films contains several aromatic rings as (A) component. As a composition for anisotropic light-diffusion films containing (meth) acrylic acid ester to be mentioned and the urethane (meth) acrylate whose weight average molecular weight as (B) component is a value in the range of 3,000-20,000, Urethane (meth) as (B) component Acrylate originates in the following (a)-(c) component as a structural component, and also a molar ratio of (a) component: (b) component: (c) component = 1: 5: 1: 1-5 While it is a compound comprised from these, content of (A) component is made into the value within the range of 25-400 weight part with respect to 100 weight part of (B) components, It is an anisotropic light-diffusion film characterized by the above-mentioned.

(a) Compounds containing two isocyanate groups via aliphatic rings

(b) polyalkylene glycol

(c) hydroxyalkyl (meth) acrylate

That is, the anisotropic light-diffusion film of the present invention is formed by photocuring a predetermined composition for anisotropic light-diffusion film, and thus has an excellent angle of incidence in light transmission and diffusion, and anisotropic light having a wide light-diffusion incident angle region. It can be set as a diffusion film.

Moreover, in forming the anisotropic light-diffusion film of this invention, it is preferable to make film thickness into the value within the range of 100-500 micrometers.

By such a configuration, even when the anisotropic light diffusing film is applied without being laminated and applied to a reflective liquid crystal display device or the like as a single layer, external light can be efficiently used as a light source, and the sharpness of the displayed image is lowered or red. Problems with the appearance of color can be prevented.

FIG. 1: (a)-(b) is a figure provided in order to demonstrate the outline of the louver structure in an anisotropic light-diffusion film.
FIG. 2: is a figure provided in order to demonstrate incidence angle dependence and anisotropy in an anisotropic light-diffusion film. FIG.
FIG. 3: (a)-(b) is another figure provided in order to demonstrate incidence angle dependence in an anisotropic light-diffusion film.
4 (a) to 4 (c) are diagrams provided for explaining the angle of incidence and the spreading angle of diffused light.
FIG. 5: (a)-(c) is a conceptual diagram provided in order to demonstrate the manufacturing method of an anisotropic light-diffusion film.
FIG. 6: (a)-(b) is a figure provided in order to demonstrate a photocuring process. FIG.
FIG. 7: (a)-(c) is a figure provided in order to demonstrate the aspect of the louver structure in the anisotropic light-diffusion film of this invention.
FIG. 8 is a view provided to explain an application example of the anisotropic light diffusing film of the present invention in a reflective liquid crystal display device.
FIG. 9 is a diagram showing a relationship between an incident angle to the anisotropic light diffusing films of Examples 1, 3, and 4 and the spreading angle of diffused light.
10A and 10B are diagrams provided for explaining a reflection type liquid crystal display device using a conventional anisotropic light diffusing film.

[First embodiment]

1st Embodiment of this invention is a (meth) acrylic acid ester containing the some aromatic ring as (A) component, and the urethane (meth) acryl whose weight average molecular weight as (B) component is a value within the range of 3,000-20,000. As a composition for an anisotropic light-diffusion film containing a rate, the urethane (meth) acrylate as (B) component originates in the following (a)-(c) component as a structural component, and also in a molar ratio (a) component: (b) component: (c) It is a compound comprised by the ratio of component = 1-5: 1: 1-5, and content of (A) component is 25-400 weight with respect to 100 weight part of (B) component. It is set as the value within a negative range, The composition for anisotropic light-diffusion films characterized by the above-mentioned.

(a) Compounds containing two isocyanate groups via aliphatic rings

(b) polyalkylene glycol

(c) hydroxyalkyl (meth) acrylate

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment of this invention is described concretely with reference to drawings.

1. Basic Principle of Anisotropic Light Diffusion Film

First, the basic principle of the anisotropic light-diffusion film (henceforth only called anisotropic light-diffusion film) obtained by photocuring the composition for anisotropic light-diffusion films of this invention is demonstrated using drawing.

First, the top view (plan view) of the anisotropic light-diffusion film 10 is shown by FIG. 1 (a), and the anisotropic light-diffusion film 10 shown by FIG. 1 (a) is dotted line in FIG. 1 (b). Sectional drawing of the anisotropic light-diffusion film 10 at the time of cut | disconnected perpendicularly along AA and looking at a cut surface from an arrow direction is shown.

As shown in the top view of such FIG. 1 (a), the anisotropic light-diffusion film 10 is a line-shaped plate-shaped area | region with the relatively high refractive index originating in (A) component in a film surface direction ( 12) and the louver structure 13 in which the line-shaped plate-shaped area | region 14 with relatively low refractive index derived from (B) component was arrange | positioned in parallel with each other.

In addition, as shown to the sectional drawing of FIG. 1 (b), the high refractive index plate-like area | region 12 derived from (A) component, and the low refractive index plate-shaped area | region 14 derived from (B) component are respectively predetermined | prescribed. The thickness is maintained, and the state in which the anisotropic light diffusing film 10 is also arranged in parallel is maintained.

As a result, as shown in FIG. 2, when the incident angle is within the light diffusing incident angle region, the incident light is estimated to be diffused by the anisotropic light diffusing film 10.

That is, as shown in FIG.1 (b), the angle of incidence of incident light with respect to the anisotropic light-diffusion film 10 is an angle within the predetermined range which is substantially parallel with respect to the boundary surface 13 'of the louver structure 13. That is, in the case of an angle within the light diffusion incident angle region, the incident light 52, 54 passes through the inside of the high refractive index plate region 12 in the louver structure along the film thickness direction while changing the direction, so that the light exit surface It is estimated that the traveling direction of the light at the side becomes the same.

As a result, when the incident angle is within the light diffusing incident angle region, it is estimated that the incident light is diffused by the anisotropic light diffusing film 10 (52 ', 54').

Moreover, the light-diffusion incidence angle region is an angle region determined for each anisotropic light-diffusion film by the refractive index difference, the inclination angle, or the like of the louver structure in the anisotropic light-diffusion film.

The direction change of the incident light in the high refractive index plate region 12 in the louver structure is curved, except in the case where the step index type is changed in a zigzag direction in a straight line by total reflection as shown in FIG. 1. It can be considered to be a gradient index type that changes direction.

On the other hand, when the incident angle of the incident light with respect to the anisotropic light-diffusion film 10 deviates from the light-diffusion incidence angle area | region, it is presumed that the incident light 56 does not diffuse by the anisotropic light-diffusion film 10, but transmits it as it is. 56 '.

According to the above mechanism, as shown in FIG. 2, the anisotropic light-diffusion film 10 provided with the louver structure 13 can exhibit incidence angle dependence in transmission and diffusion of light.

In addition, as shown in FIG. 2, when the incident angle of incident light is in the light-diffusion incident angle area | region, the anisotropic light-diffusion film provided with the louver structure is light-diffusing substantially similarly on the light emission surface side, even if the incident angle differs. You can let

Therefore, it can be said that the anisotropic light-diffusion film provided with the louver structure also has the light condensing action which concentrates light in a predetermined location.

In addition, in the present invention, "anisotropy" means, in the diffused outgoing light in the case where light is diffused by a film, for example, as diffused light 52 ', 54' in FIG. In the plane parallel to the film, the diffusion state of the light (shape of spreading of the diffused light) means a property that varies depending on the direction in the same plane.

More specifically, in the case of the anisotropic light-diffusion film 10 of the present invention, mainly in the plane parallel to the film in the diffused outgoing light, of the louver structure extending along the in-plane direction of the film 10 Light is diffused in a direction perpendicular to the direction, and the shape of spreading of the diffused light is substantially elliptical (52 ', 54').

In addition, the relationship between the incident angle of incident light with respect to the anisotropic light-diffusion film and the spreading angle of the diffused light diffused by the anisotropic light-diffusion film is demonstrated using FIG. 3 (a).

That is, in Fig. 3 (a), a characteristic curve formed by taking the incident angle (°) of incident light with respect to the anisotropic light diffusing film on the horizontal axis and the spreading angle (°) of the diffused light diffused by the anisotropic light diffusing film on the vertical axis is shown. have.

In addition, as shown to Fig.4 (a)-(c), the incidence angle (theta) 1 means the angle (degree) in the case where the angle which injects perpendicularly with respect to the anisotropic light-diffusion film 10 is 0 degree.

More specifically, as mentioned above, since the component of incident light which contributes to anisotropic light diffusion is a component perpendicular | vertical to the direction of the louver structure extended mainly to a film surface direction, it is called "incidence angle (theta) 1" of incident light in this invention. In this case, the incident angle of the component perpendicular to the direction of the louver structure extending in the film plane direction shall be taken. In addition, in this case, the incident angle θ1 shall mean an angle (°) when the angle with respect to the normal of the incident side surface of the anisotropic light diffusing film is 0 °.

In addition, the spreading angle θ2 of the diffused light literally means the spreading angle (°) of the diffused light.

In addition, as the spreading angle of the diffused light increases, it means that light incident at the incident angle at that time is effectively diffused by the anisotropic light diffusing film.

On the contrary, as the spreading angle of the diffused light becomes smaller, it means that light incident at the incident angle at that time passes through the anisotropic light diffusing film as it is and does not diffuse.

The specific measuring method of the spreading angle of such diffused light is described in an Example.

As understood from these characteristic curves, in the case of an anisotropic light diffusing film, the degree of transmission and diffusion of light varies greatly depending on the incident angle, so that the light diffusing incident angle region and other incident angle regions can be clearly separated. Can be.

On the other hand, in the case of the film having no incidence angle dependency, as shown in Fig. 3B, the change in the incidence angle does not have a definite influence on the degree of transmission and diffusion of light, and thus the light diffusion incident angle region cannot be recognized.

Moreover, in this invention, as shown to FIG. 3 (a), the difference between a light-diffusion incident angle area | region and other incidence angle area | regions is clear, and an anisotropic light-diffusion film with a wide light-diffusion incident angle area | region, And it aims at obtaining the composition for anisotropic light-diffusion films which can obtain it.

2. (A) component: (meth) acrylic acid ester

(1) Type

The composition for anisotropic light-diffusion films of this invention contains (meth) acrylic acid ester containing a some aromatic ring as (A) component, It is characterized by the above-mentioned.

The reason for this is that by containing a specific (meth) acrylic acid ester as the component (A), the polymerization rate of the component (A) is made faster than the polymerization rate of the component (B), and the polymerization rate between these components It is because it is estimated that a predetermined difference can be generated and the copolymerizability of both components can be effectively reduced.

As a result, at the time of photocuring, what is called a louver structure in which the plate-shaped area | region derived from (A) component and the plate-shaped area | region derived from (B) component mutually extend can be formed efficiently.

Moreover, by containing a specific (meth) acrylic acid ester as (A) component, it has sufficient compatibility with (B) component in the step of a monomer, and at the stage connected in plural in the process of superposition | polymerization with (B) component It is estimated that compatibility can be reduced to a predetermined range and the louver structure can be formed more efficiently.

Furthermore, by containing specific (meth) acrylic acid ester as (A) component, the refractive index of the plate-shaped area | region derived from (A) component in louver structure is made high, and the refractive index of the plate-shaped area | region derived from (B) component The difference between and can be adjusted to a predetermined value or more.

Therefore, by containing specific (meth) acrylic acid ester as (A) component, the anisotropic light-diffusion film provided with the louver structure by which plate-shaped area | regions from which refractive index differs mutually mutually existed with the characteristic of (B) component mentioned later is efficient. You can get

Therefore, while having good incidence angle dependence in transmission and diffusion of light, an anisotropic light diffusion film having a wide light diffusion incident angle region can be obtained.

Moreover, "(meth) acrylic acid ester containing a plurality of aromatic rings" means the compound which has a some aromatic ring in the esterification part of (meth) acrylic acid ester.

In addition, "(meth) acrylic acid" means both acrylic acid and methacrylic acid.

Moreover, as (meth) acrylic acid ester containing the some aromatic ring as such (A) component, (meth) acrylic-acid biphenyl, (meth) acrylic-acid naphthyl, (meth) acrylate anthracyl, (meth) Benzyl phenyl acrylate, biphenyloxyalkyl (meth) acrylate, naphthyloxyalkyl (meth) acrylate, anthracyloxyalkyl (meth) acrylate, benzyl phenyloxyalkyl (meth) acrylate, or a part thereof is halogen, The thing substituted by alkyl, alkoxy, a halogenated alkyl, etc. are mentioned.

Moreover, it is preferable to contain the compound containing a biphenyl ring as (meth) acrylic acid ester containing the some aromatic ring as (A) component, Especially, the biphenyl compound represented by following General formula (1) It is preferable to contain.

(In General formula (1), R <^1> -R <^10> is respectively independent and R <^1> -R <^10>. At least 1 is a substituent represented by following General formula (2), and the remainder is a substituent which is any one of a hydrogen atom, a hydroxyl group, a carboxy group, an alkyl group, an alkoxy group, a halogenated alkyl group, a hydroxyalkyl group, a carboxyalkyl group, and a halogen atom. to be.)

(In General Formula (2), R ¹¹ is a hydrogen atom or a methyl group, carbon number n is an integer of 1 to 4, and the repeating number m is an integer of 1 to 10.)

This is because it is estimated that by containing a biphenyl compound having a specific structure as the component (A), the polymerization rate of the component (A) can be made faster than the polymerization rate of the component (B). .

Moreover, compatibility with (B) component can be reduced more easily to a predetermined range, and also the refractive index of the plate-shaped area | region derived from (A) component in louver structure is made high, (B) The difference with the refractive index of the plate-shaped area derived from a component can be adjusted more easily to a predetermined value or more.

Furthermore, it is liquid at the monomer stage before photocuring, and can be mixed uniformly with urethane (meth) acrylate as (B) component, without using a diluting solvent.

In addition, when R <^1> -R <^10> in General formula (1) contains any of an alkyl group, an alkoxy group, a halogenated alkyl group, a hydroxyalkyl group, and a carboxyalkyl group, carbon number of the alkyl part is 1-4. It is preferable to set it as the value within a range.

The reason for this is that if the carbon number is more than 4, the polymerization rate of the component (A) is lowered, or the refractive index of the plate region derived from the component (A) in the louver structure is too low, and the anisotropic light It is because it may become difficult to form a predetermined louver structure in a diffusion film efficiently.

Therefore, when R <^1> -R <^10> in General formula (1) contains any of an alkyl group, an alkoxy group, a halogenated alkyl group, a hydroxyalkyl group, and a carboxyalkyl group, carbon number of the alkyl part is 1-3, It is more preferable to set it as the value within a range, and it is still more preferable to set it as the value within the range of 1-2.

In addition, it is preferable that R <^1> -R <^10> in General formula (1) is a substituent other than a halogenated alkyl group or a halogen atom, ie, a substituent which does not contain a halogen.

This is because dioxins are prevented from being generated when the anisotropic light-diffusion film is incinerated, and the like is preferable from the viewpoint of environmental protection.

Moreover, in the anisotropic light-diffusion film provided with the conventional louver structure, in order to obtain a predetermined louver structure and to high refractive index of a monomer component, it was common to perform halogen substitution in a monomer component.

For this reason, as long as it is a biphenyl compound represented by General formula (1), even if halogen substitution is not performed, it can be set as high refractive index.

Therefore, if it is an anisotropic light-diffusion film formed by photocuring the composition for anisotropic light-diffusion films of this invention, even when it does not contain a halogen, favorable incident angle dependence can be exhibited.

Moreover, it is preferable that any one of R <^2> -R <^9> in General formula (1) is a substituent represented by General formula (2).

The reason for this is that by positioning the substituent represented by the general formula (2) to a position other than R ¹ and R ¹⁰ , in the step before photocuring, the components (A) are oriented and crystallized effectively. can do.

Thereby, in the step of photocuring, it becomes possible to isolate | separate aggregate phase at the fine level of (A) component and (B) component, and can obtain the anisotropic light-diffusion film provided with a predetermined louver structure more efficiently. Because there is.

Furthermore, it is especially preferable that any one of R <^3> , R <^5> , R <^6> and R <^8> in General formula (1) is a substituent represented by General formula (2).

In addition, it is preferable to make the repeating number m in the substituent represented by General formula (2) as an integer of 1-10 normally.

The reason for this is that when the repeating number m becomes a value exceeding 10, the oxyalkylene chain connecting the polymerization site and the biphenyl ring becomes too long, and the polymerization of the components (A) in the polymerization site may be inhibited. Because.

Therefore, it is more preferable to make the repeating number m in the substituent represented by General formula (2) into an integer of 1-4, and it is especially preferable to set it as an integer of 1-2.

Moreover, it is preferable to make carbon number n in the substituent represented by General formula (2) into an integer of 1-4 normally from a same viewpoint.

Moreover, when the position of the polymerizable carbon-carbon double bond which is a polymerization site | part is too close with respect to a biphenyl ring, a biphenyl ring becomes a steric hindrance, and also the case where the polymerization rate of (A) component falls, general formula ( It is more preferable to make carbon number n in the substituent represented by 2) into an integer of 2-4, and it is especially preferable to set it as an integer of 2-3.

Moreover, as a specific example of the biphenyl compound represented by General formula (1), the compound represented by following formula (3)-(4) is mentioned preferably.

(2) Weight average molecular weight

Moreover, it is preferable to make the weight average molecular weight of specific (meth) acrylic acid ester as (A) component into the value within the range of 200-2500.

The reason is that by setting the weight average molecular weight of the specific (meth) acrylic acid ester as the component (A) within a predetermined range, the polymerization rate of the component (A) is made faster, and the air of the component (A) and the component (B) It is assumed that the synthesis can be lowered more effectively.

As a result, at the time of photocuring, the louver structure in which the plate-shaped thing derived from (A) component and the plate-shaped thing derived from (B) component were mutually extended can be formed more efficiently.

That is, when the weight average molecular weight of the component (A) is less than 200, the positions of the plurality of aromatic rings and the positions of the polymerizable carbon-carbon double bonds become too close, and the polymerization rate decreases due to steric hindrance, and (B This is because the copolymerization with the component (B) may easily occur due to the polymerization rate of the component. On the other hand, when the weight average molecular weight of (A) component becomes the value exceeding 2,500, the difference of the molecular weight with (B) component will become small, the polymerization rate of (A) component will fall and will approach the polymerization rate of (B) component. And copolymerization with (B) component are likely to occur, and as a result, it may be difficult to efficiently form a louver structure.

Therefore, it is more preferable to make the weight average molecular weight of specific (meth) acrylic acid ester as (A) component into the value within the range of 240-1,500, and it is more preferable to set it as the value within the range of 260-1,000.

In addition, the weight average molecular weight of (A) component can be calculated | required from the calculated value obtained from the composition of a molecule | numerator and the atomic weight of a constituent atom.

In addition, the weight average molecular weight of (A) component can also be measured using gel permeation chromatography (GPC).

Moreover, the composition for anisotropic light-diffusion films of this invention is a monomer component which forms a plate-shaped area | region with a high refractive index in a louver structure, and contains (meth) acrylic acid ester containing several aromatic rings as (A) component. It is characterized by the above-mentioned, but it is preferable to contain (A) component independently as a monomer component.

The reason for this configuration is to effectively suppress the unevenness of the refractive index in the plate-shaped region derived from component (A) in the louver structure, that is, the plate-shaped region having a high refractive index, and to provide anisotropic structure having a predetermined louver structure. It is because a light-diffusion film can be obtained more efficiently.

That is, when compatibility with (B) component in (A) component is low, for example, when (A) component is a halogen-type compound etc., it is for making (A) component compatible with (B) component. As a 3rd component, another (A) component (for example, a non-halogen type compound etc.) may be used together.

However, in this case, depending on the influence of such a 3rd component, the refractive index in the plate-shaped area | region with a high refractive index derived from (A) component may become uneven or it may become easy to fall.

As a result, there may be a case where the refractive index difference with the plate-shaped region having a low refractive index derived from the component (B) becomes nonuniform or easily decreases excessively.

Therefore, it is preferable to select the monomer component which is high refractive index which has compatibility with (B) component, and to use it as a single (A) component.

For example, if it is a biphenyl compound represented by Formula (3) as (A) component, since it is low viscosity, it can be used as a single (A) component, in order to have compatibility with (B) component.

(3) refractive index

Moreover, it is preferable to make refractive index of specific (meth) acrylic acid ester as (A) component into the value within the range of 1.5-1.65.

The reason for this is that by setting the refractive index of the component (A) within this range, the difference between the refractive index of the plate region derived from the component (A) in the louver structure and the refractive index of the plate region derived from the component (B) This is because the anisotropic light diffusing film having a predetermined louver structure can be adjusted more easily to obtain more efficiently.

That is, when the refractive index of the component (A) is less than 1.5, the difference with the refractive index of the component (B) becomes too small, and it may be difficult to obtain a desired incident angle dependency. On the other hand, when the refractive index of the component (A) is more than 1.65, the difference with the refractive index of the component (B) is greatly different, but compatibility with the component (B) may be difficult.

Therefore, it is more preferable to make refractive index of specific (meth) acrylic acid ester as (A) component into the value within the range of 1.55-1. 6, and it is still more preferable to set it as the value within the range of 1.56-1.59.

In addition, the refractive index of (A) component mentioned above means the refractive index of (A) component before hardening according to light irradiation.

In addition, a refractive index can be measured according to JISK0062, for example.

(4) content

Moreover, content of specific (meth) acrylic acid ester as (A) component is made into the value within the range of 25-400 weight part with respect to 100 weight part of urethane (meth) acrylates as (B) component mentioned later, It is characterized by the above-mentioned. do.

This reason is, when content of (A) component is less than 25 weight part, the abundance ratio of (A) component with respect to (B) component becomes small, and plate shape derived from (A) component in louver structure It is because the width | variety of an area | region becomes excessively small compared with the width | variety of the plate-shaped area | region derived from (B) component, and it may become difficult to obtain the louver structure which has a favorable incident angle dependency. Moreover, it is because the length of the louver in the thickness direction of an anisotropic light-diffusion film may become inadequate and it may not show light-diffusion property. On the other hand, when content of (A) component becomes the value exceeding 400 weight part, the abundance ratio of (A) component with respect to (B) component increases, and the plate-shaped area | region derived from (A) component in louver structure This is because the width becomes excessively large compared with the width of the plate-shaped region derived from the component (B), and on the contrary, it may be difficult to obtain a louver structure having good incidence angle dependence. Moreover, it is because the length of the louver in the thickness direction of an anisotropic light-diffusion film may become inadequate and it may not show light-diffusion property.

Therefore, it is more preferable to make content of specific (meth) acrylic acid ester as (A) component into the value within the range of 40-300 weight part with respect to 100 weight part of urethane (meth) acrylates as (B) component, It is more preferable to set it as the value within the range of 50-200 weight part.

3. (B) component: urethane (meth) acrylate

(1) Type

The composition for anisotropic light-diffusion films of this invention contains urethane (meth) acrylate derived from a predetermined structural component as (B) component, It is characterized by the above-mentioned.

That is, it is derived from the following (a)-(c) component as a structural component, and is comprised by the ratio of (a) component: (b) component: (c) component = 1: 5: 1: 1-5 in molar ratio. It is characterized by containing a urethane (meth) acrylate.

(a) Compounds containing two isocyanate groups via aliphatic rings

(b) polyalkylene glycol

(c) hydroxyalkyl (meth) acrylate

This reason is that if it is such a specific urethane (meth) acrylate, since it comprises the compound (henceforth alicyclic diisocyanate) which contains two isocyanate groups via an aliphatic ring as (a) component, This is because it is easy to provide a difference in the reaction rate of the isocyanate group.

In particular, compared with a compound containing two isocyanate groups on the fatty chain (hereinafter referred to as aliphatic diisocyanate) such as hexamethylene diisocyanate, the reaction rate of each isocyanate group can be easily changed depending on the steric structure and the like. You can arrange a car.

Thus, for example, it is possible to inhibit the component (a) from reacting only with the component (b) or the component (a) from reacting only with the component (c), thereby reducing the component (a) from the component (b) and ( c) It can react reliably with a component, and can prevent generation of an excess side product.

As a result, the irregularity of the refractive index of the plate-shaped area | region derived from the (B) component in a anisotropic light-diffusion film, ie, a low refractive index plate-shaped area | region, can be suppressed effectively.

Moreover, since alicyclic diisocyanate as (a) component is used as a structural component, compatibility with the urethane (meth) acrylate as (B) component obtained and the specific (meth) acrylic acid ester as (A) component is prescribed | regulated. It can be reduced to the range of, and the louver structure can be formed more efficiently.

In particular, compared with the diisocyanate which has an aromatic ring like toluene diisocyanate (henceforth aromatic diisocyanate), the urethane (meth) acrylate as (B) component obtained and some aromatic ring as (A) component are obtained. The compatibility with the (meth) acrylic acid ester to contain is reduced to a predetermined range, and a louver structure can be formed efficiently.

That is, since aromatic diisocyanate has an aromatic ring in frame | skeleton, compatibility with the urethane (meth) acrylate as (B) component obtained and (A) component which has an aromatic ring in frame | skeleton similarly to this becomes high too much, and louver It is because it may become difficult to form a structure efficiently.

Furthermore, if it is alicyclic diisocyanate, the refractive index of urethane (meth) acrylate as (B) component obtained can be made small compared with aromatic diisocyanate.

That is, it is because the refractive index of the compound tends to increase by containing an aromatic ring in a molecule | numerator normally.

Therefore, the difference between the refractive index of urethane (meth) acrylate as (B) component obtained and the refractive index of specific (meth) acrylic acid ester as (A) component is enlarged, and the louver structure which has favorable incidence angle dependency is more efficient. It can form well.

Moreover, even if it is a urethane (meth) acrylate containing an aliphatic diisocyanate and an aromatic diisocyanate as a component, if it exists in the range which does not prevent the effect of this invention, it does not restrict | limit coexisting with the (B) component of this invention. .

Moreover, as alicyclic diisocyanate containing two isocyanate groups which are (a) component, For example, isophorone diisocyanate (IPDI), 2, 4- and / or 2, 6- methylcyclohexane diisocyanate, dicyclo Hexylmethane-4,4'-diisocyanate, cyclohexylene diisocyanate, methylcyclohexylene diisocyanate, bis (2-isocyanate ethyl) -4-cyclohexylene-1,2-dicarboxylate, 2,5- And / or 2,6-norbornane diisocyanate, dimer acid diisocyanate (DDI), etc. are mentioned preferably.

Especially, it is especially preferable that it is isophorone diisocyanate (IPDI) from a big difference in the reaction rate of two isocyanate groups.

Moreover, as a polyalkylene glycol which is (b) component among the components which form a urethane (meth) acrylate, polyethyleneglycol, polypropylene glycol, polybutylene glycol, polyhexylene glycol etc. are mentioned, for example. Especially, it is especially preferable that it is polypropylene glycol.

This reason is because polypropylene glycol can be handled as a solvent without the viscosity being low.

Moreover, when it is polypropylene glycol, when hardening (B) component, it becomes a favorable soft segment in the said hardened | cured material, and the handling property and mountability of an anisotropic light-diffusion film can be improved effectively. to be.

Moreover, the weight average molecular weight of (B) component can be adjusted according to the weight average molecular weight of (b) component. Here, the weight average molecular weight of (b) component is 2,300-19,500 normally, Preferably it is 4,300-14,300, Especially preferably, it is 6,300-12,300.

Moreover, as hydroxyalkyl (meth) acrylate which is (c) component among the components which form urethane (meth) acrylate, 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl ( Meta) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and the like. Can be mentioned.

Moreover, it is more preferable that it is hydroxyalkyl methacrylate especially from a viewpoint of reducing the superposition | polymerization rate of the urethane (meth) acrylate obtained and forming a predetermined louver structure more efficiently, and 2-hydroxyethyl methacryl It is more preferable that it is a rate.

In addition, the synthesis | combination of urethane (meth) acrylate by (a)-(c) component can be performed in accordance with a conventional method.

At this time, the compounding ratio of (a)-(c) component is made into the ratio of (a) component: (b) component: (c) component = 1-5: 1: 1-5 by molar ratio. .

This reason is, by setting it as such a compounding ratio, the one isocyanate group which (a) component has respectively reacted and couple | bonds with respect to the two hydroxyl groups which (b) component has, Furthermore, the other one which the two (a) components have respectively It is because the urethane (meth) acrylate which the hydroxyl group which (c) component has reacted and couple | bonded with the isocyanate group of can react efficiently.

Therefore, it is more preferable to make the compounding ratio of (a)-(c) component into the ratio of (a) component: (b) component: (c) component = 1-1: 1: 1-3 by molar ratio, More preferably, the ratio is 2: 1: 2.

(2) Weight average molecular weight

Moreover, the weight average molecular weight of the urethane (meth) acrylate as (B) component is made into the value within the range of 3,000-20,000, It is characterized by the above-mentioned.

This reason is, by making the weight average molecular weight of the urethane (meth) acrylate as the component (B) within a predetermined range, the polymerization rate of the component (B) is further reduced, and the component (A) and the component (B) are copolymerized. It is because the anisotropic light-diffusion film provided with the predetermined louver structure can be prevented more effectively, and it can obtain more efficiently.

In other words, when the weight average molecular weight of the component (B) is less than 3,000, the polymerization rate of the component (B) is increased, the polymerization rate of the component (A) is closer to copolymerization with the component (A). This is because it may be difficult to efficiently form a louver structure. On the other hand, when the weight average molecular weight of (B) component becomes a value exceeding 20,000, it is difficult to form the louver structure in which the plate-shaped area | region derived from (A) component and the plate-shaped area | region derived from (B) component mutually extended. This is because the compatibility with the component (A) may be excessively lowered or the component (A) may precipitate in the coating step.

Therefore, it is more preferable to make the weight average molecular weight of urethane (meth) acrylate as (B) component into the value within the range of 5,000-15,000, and it is still more preferable to set it as the value within the range of 7,000-13,000.

In addition, the weight average molecular weight of (B) component can be measured using a gel permeation chromatography (GPC).

Moreover, the composition for anisotropic light-diffusion films of this invention contains urethane (meth) acrylate as (B) component as an oligomer component which forms the plate-shaped region with low refractive index in a louver structure, However, it is an oligomer It is preferable to contain (B) component independently as a component.

The reason for this configuration is to effectively suppress the unevenness of the refractive index in the plate-shaped region derived from the component (B) in the louver structure, that is, the plate-shaped region having a low refractive index, and to provide anisotropic structure having a predetermined louver structure. It is because a light-diffusion film can be obtained more efficiently.

That is, when a plurality of (B) components are used, the refractive index in the plate region having a low refractive index derived from the component (B) is uneven or high, and thus the plated region having a high refractive index derived from the component (A) This is because the difference in refractive index may become uneven or easily decrease excessively.

(3) refractive index

Moreover, it is preferable to make refractive index of urethane (meth) acrylate as (B) component into the value within the range of 1.4-1.5.

This reason is, by making the refractive index of (B) component into a value within this range, the difference between the refractive index of the plate-shaped area | region derived from (A) component in a louver structure, and the plate-shaped area | region derived from (B) component, It is because it can adjust more easily and the anisotropic light-diffusion film provided with a predetermined louver structure can be obtained more efficiently.

That is, if the refractive index of the component (B) is less than 1.4, the difference with the refractive index of the component (A) is greatly different, but the compatibility with the component (A) is extremely deteriorated, so that the louver structure cannot be formed. Because there is a fear. On the other hand, when the refractive index of (B) component becomes a value exceeding 1.5, the difference with the refractive index of (A) component becomes small too much, and it may become difficult to acquire desired incident angle dependence.

Therefore, it is more preferable to make the refractive index of the urethane (meth) acrylate as (B) component be a value within the range of 1.45-1.49, and it is still more preferable to set it as the value within the range of 1.46-1.48.

In addition, the refractive index of (B) component mentioned above means the refractive index of (B) component before hardening according to light irradiation.

In addition, a refractive index can be measured according to JISK0062, for example.

Moreover, it is preferable to make the difference of the refractive index of (A) component mentioned above and the refractive index of (B) component into 0.01 or more value.

The reason for this is that by setting the difference in refractive index within a predetermined range, it is possible to obtain an anisotropic light-diffusion film having a wider light diffusing incidence angle region and having a better incidence angle dependency in light transmission and diffusion. Because.

In other words, when the difference in refractive index is less than 0.01, the angle range at which the incident light totally reflects in the louver structure is narrowed, so that the angle of spreading of the diffused light may be excessively narrowed. On the other hand, it is because there exists a possibility that the compatibility of (A) component and (B) component may deteriorate and a louver structure cannot be formed when this difference of refractive index becomes an excessively large value.

Therefore, it is more preferable to make the difference between the refractive index of (A) component and the refractive index of (B) component into the value within the range of 0.05-0.5, and it is still more preferable to set it as the value within the range of 0.1-0.2.

In addition, the refractive index of (A) component and (B) component here means the refractive index of (A) component and (B) component before hardening by light irradiation.

(4) content

Moreover, it is preferable to make content of the urethane (meth) acrylate as (B) component into the value within 20 to 80 weight% with respect to 100 weight% of total amounts of the composition for anisotropic light-diffusion films.

This reason is that when the content of the component (B) is less than 20% by weight, the abundance ratio of the component (B) to the component (A) decreases, and the plate shape derived from the component (B) in the louver structure. It is because the width | variety of an area | region becomes excessively small compared with the width | variety of the plate-shaped area | region derived from (A) component, and it may become difficult to obtain the louver structure which has favorable incidence angle dependence. Moreover, it is because the length of the louver in the thickness direction of an anisotropic light-diffusion film may become inadequate. On the other hand, when content of (B) component becomes the value exceeding 80 weight%, the abundance ratio of (B) component with respect to (A) component increases, and the plate-shaped area | region derived from (B) component in louver structure This is because the width of is excessively large compared with the width of the plate-shaped region derived from the component (A), and on the contrary, it may be difficult to obtain a louver structure having good incidence angle dependence. Moreover, it is because the length of the louver in the thickness direction of an anisotropic light-diffusion film may become inadequate.

Therefore, it is more preferable to make content of the urethane (meth) acrylate as (B) component into the value within the range of 30-70 weight% with respect to 100 weight% of total amounts of the composition for anisotropic light-diffusion films, and 40? It is more preferable to set it as the value within 60 weight% of range.

4. Photopolymerization Initiator

Moreover, in the composition for anisotropic light-diffusion films of this invention, it is preferable to contain a photoinitiator as (C) component as needed.

This reason is because by containing a photoinitiator, a predetermined louver structure can be efficiently formed when irradiating an active energy ray with respect to the composition for anisotropic light-diffusion films.

Here, a photoinitiator means the compound which generate | occur | produces a radical species according to irradiation of active energy rays, such as an ultraviolet-ray.

Examples of such photopolymerization initiators include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl Phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propane-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2 -Propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2- Aminoanthraquinone, 2-methyl thioxanthone, 2-ethyl thioxanthone, 2-chloro thioxanthone, 2,4-dimethyl thioxanthone, 2,4-diethyl thioxanthone, benzyl dimethyl ketal, acetophenone Dimethyl ketal, p-dimethyla Minbenzoic acid ester, oligo [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propane, etc. are mentioned, You may use these 1 type independently, and 2 or more types You may use in combination.

Moreover, as content in the case of containing a photoinitiator, it is preferable to set it as the value within the range of 0.2-20 weight% with respect to 100 weight% of total amounts of (A) component and (B) component, and it is 0.5-15 weight% It is more preferable to set it as the value within a range, and it is still more preferable to set it as the value within the range of 1-10 weight%.

5. Other additives

Moreover, other additives can be added suitably in the range which does not impair the effect of this invention.

As another additive, antioxidant, a ultraviolet absorber, an antistatic agent, a polymerization promoter, a polymerization inhibitor, an infrared absorber, a plasticizer, a dilution solvent, a leveling agent, etc. are mentioned, for example.

Moreover, it is preferable to make content of another additive into the value within the range of 0.01-5 weight% generally with respect to 100 weight% of total amounts of (A) component and (B) component, and it is 0.02-3 weight% It is more preferable to set it as the value within a range, and it is still more preferable to set it as the value within the range of 0.05-2 weight%.

[Second embodiment]

2nd Embodiment of this invention WHEREIN: The anisotropic light-diffusion film formed by irradiating an active energy ray with respect to the composition for anisotropic light-diffusion films, The composition for anisotropic light-diffusion film has a plurality of aromatic rings as (A) component. As a composition for anisotropic light-diffusion films containing (meth) acrylic acid ester to contain and urethane (meth) acrylate as (B) component, urethane (meth) acrylate as (B) component is a following component (a) It is a compound which originates in the (c) component, and is comprised in the ratio of (a) component: (b) component: (c) component = 1-5: 1: 1-5 in a molar ratio, (A) Content of a component is made into the value within the range of 25-400 weight part with respect to 100 weight part of (B) component, It is an anisotropic light-diffusion film characterized by the above-mentioned.

(a) Compounds containing two isocyanate groups via aliphatic rings

(b) polyalkylene glycol

(c) hydroxyalkyl (meth) acrylate

EMBODIMENT OF THE INVENTION Hereinafter, 2nd Embodiment of this invention is described concretely, referring FIG. 5 centering around a point different from 1st Embodiment.

1. Manufacturing Method

Hereinafter, although the manufacturing method of the anisotropic light-diffusion film of this invention is demonstrated, it goes without saying that this anisotropic light-diffusion film is not limited to the following manufacturing methods.

(1) Preparation process of composition for anisotropic light-diffusion film

The preparation process of the composition for anisotropic light-diffusion films is a process of preparing the predetermined composition for anisotropic light-diffusion films containing (A) component and (B) component.

More specifically, (A) component and (B) component are stirred under the high temperature conditions of 40-80 degreeC, and it is preferable to set it as a uniform liquid mixture.

At the same time, after adding other additives, such as (C) component, to a liquid mixture as desired, and further adding a dilution solvent as needed so that it may become a desired viscosity, stirring until it becomes a uniform appearance, anisotropic light It is preferable to obtain the solution of the composition for diffusion films.

In addition, since it is as having described in 1st Embodiment, the detail, compounding ratio, etc. of each component are abbreviate | omitted.

(2) application process

As shown in FIG.5 (a), a coating process is a process of apply | coating the prepared composition for anisotropic light-diffusion films with respect to the process sheet | seat 2, and forming the application layer 1.

As a process sheet, any of a plastic film and paper can be used.

Among these, examples of the plastic film include polyester film such as polyethylene terephthalate film, polyolefin film such as polyethylene film and polypropylene film, cellulose film such as triacetyl cellulose film, and polyimide film. .

Moreover, as paper, glassine paper, coated paper, laminated paper, etc. are mentioned, for example.

In addition, about a process sheet, in order to make it easy to peel off the obtained anisotropic light-diffusion film from a process sheet after photocuring, it is preferable to provide a peeling layer in the application surface side of the composition for anisotropic light-diffusion films in a process sheet. .

Such a peeling layer can be formed using conventionally well-known peeling agents, such as a silicone peeling agent, a fluorine peeling agent, an alkyd peeling agent, and an olefin peeling agent.

Moreover, it is preferable to make thickness of a process sheet into the value within the range of 25-200 micrometers normally.

Moreover, as a method of apply | coating the composition for anisotropic light-diffusion films on a process sheet, it is conventionally well-known, such as a knife coating method, a roll coating method, a bar coating method, a blade coating method, a die coating method, and a gravure coating method, for example. It can be performed according to the method of.

Moreover, at this time, it is preferable to make thickness of an application layer into the value within the range of 100-700 micrometers.

(3) photocuring process

A photocuring process is a process of photocuring the application layer of the composition for anisotropic light-diffusion films, and making an application layer into an anisotropic light-diffusion film.

That is, as shown to FIG. 5 (b), the active energy ray 50 which consists only of direct light by which the irradiation angle was controlled is irradiated to the application layer 1 formed on the process sheet 2.

More specifically, for example, as shown in Fig. 6 (a), the ultraviolet irradiation device 20 (example is provided with a cold mirror 22 for condensing on the linear UV lamp 25). For example, if it is a commercial item, the active energy ray 50 which consists only of the direct light by which the irradiation angle was controlled by arrange | positioning the heat ray cut filter 21 and the light shielding plate 23 in Eye Graphics Co., Ltd. product, ECS-4011GX etc.). It extracts and irradiates the coating layer 1 formed on the process sheet 2 with it.

In addition, the linear ultraviolet lamp has a value within the range of -80 to 80 °, preferably on the basis of the direction (0 °) which is perpendicular to the longitudinal direction of the process sheet 2 having the coating layer 1. It is provided so as to be a value in the range of -50 to 50 °, particularly preferably in the range of -30 to 30 °.

At this time, as irradiation angle of irradiation light, as shown to FIG. 6 (b), irradiation angle (theta) 3 when the angle with respect to the normal line of the surface of the coating layer 1 is 0 degrees, is -80 to 80 degrees normally. It is preferable to set it as the value within the range of.

This reason is because when the irradiation angle θ3 is a value outside the range of -80 ° to 80 °, the influence of reflection and the like on the surface of the coating layer 1 becomes large, and it may be difficult to form a sufficient louver structure. .

Moreover, it is preferable that irradiation angle (theta) 3 has the width (irradiation angle width) (theta) 3 'of 1-80 degrees.

This reason is because when such irradiation angle width | variety (theta) 3 'is set to a value less than 1 degree, the space | interval of louver structure will become too narrow and it may become difficult to obtain an anisotropic light-diffusion film. On the other hand, when such irradiation angle width | variety (theta) 3 'becomes a value exceeding 80 degrees, it is because irradiation light may scatter too much and it may become difficult to form a louver structure.

Therefore, it is more preferable to make irradiation angle width | variety (theta) 3 'of irradiation angle (theta) 3 into the value within the range of 2 to 45 degrees, and it is still more preferable to set it to the value within the range of 5 to 20 degrees.

Moreover, by using a linear light source, irradiated light which is substantially parallel light when it sees from the axial direction of a linear light source, and nonparallel when viewed from the direction perpendicular to the axial direction of a linear light source.

Moreover, although an ultraviolet-ray, an electron beam, etc. are mentioned as irradiation light, it is preferable to use an ultraviolet-ray.

This is because, in the case of an electron beam, the polymerization rate is very fast, and thus, (A) component and (B) component cannot be sufficiently phase separated in the polymerization process, and it may be difficult to form a louver structure. On the other hand, when compared with visible light and the like, since the ultraviolet rays are rich in variations of the ultraviolet curable resin curable according to the irradiation and the photoinitiator that can be used, the choice of the components (A) and (B) Because it can widen.

Moreover, as irradiation conditions of an ultraviolet-ray, it is preferable to carry out so that the peak illuminance at the time of irradiation may be a value within the range of 0.1-50 mW / cm <^2> , and it may be so that the accumulated light amount which harden | cures a coating layer fully may be performed.

Moreover, it is also preferable to irradiate an ultraviolet-ray in multiple steps so that the amount of accumulated light which a coating layer may fully harden.

Moreover, it is preferable to move the coating layer formed on the process sheet at a speed | rate of 0.1-10 m / min, and to let the ultraviolet irradiation part by an ultraviolet irradiation device pass.

This reason is because when such a speed is made into the value below 0.1 m / min, mass productivity may fall excessively. On the other hand, when such a speed becomes a value exceeding 10 m / min, curing of the coating layer, in other words, faster than the formation of the louver structure, the angle of incidence of the ultraviolet rays to the coating layer changes greatly along the film thickness direction, and thus the louver. This is because the formation of the structure may be insufficient.

Therefore, it is more preferable to move the coating layer formed on the base material at a speed within the range of 0.2 to 5 m / min, and to pass the ultraviolet irradiation part by the ultraviolet irradiation device, and to pass at a speed within the range of 0.5 to 3 m / min. More preferably.

Moreover, as shown in FIG.5 (c), the anisotropic light-diffusion film 10 after a photocuring process peels a process sheet 2, and finally, it becomes a state which can be used.

2. film thickness

Moreover, it is preferable to make the film thickness of an anisotropic light-diffusion film into the value within the range of 100-500 micrometers.

This is because by setting the film thickness of the anisotropic light diffusing film to a value within this range, even when the anisotropic light diffusing film is applied to a reflective liquid crystal display device or the like without being laminated, the external light can be efficiently used as a light source. This is because it is possible to prevent the occurrence of a problem that the sharpness of the displayed image is lowered or the iris color appears.

That is, when such a film thickness is set to a value of less than 100 µm, the length of the louver structure in the film thickness direction formed in the film is excessively short, the incident light which goes straight into the louver structure increases, and sufficient incident angle dependency This is because it may become difficult to obtain. On the other hand, when such a film thickness becomes a value exceeding 500 micrometers, since irradiation light will be irradiated for a long time, mass productivity will fall excessively, or irradiation light will spread | diffuse by the louver structure initially formed, and a desired louver structure This is because it may be difficult to form a.

Therefore, it is more preferable to make the film thickness of an anisotropic light-diffusion film into the value within the range of 130-300 micrometers, and it is still more preferable to set it as the value within the range which is 150-250 micrometers.

3. louver structure

In addition, as shown to Fig.7 (a)-(c), the anisotropic light-diffusion film 10 of this invention is the plate-shaped area | region 12 derived from (A) component, and plate shape derived from (B) component. Although the area | region 14 has the louver structure which mutually extended, each width S1 and S2 of the plate-shaped area | region 12 derived from (A) component, and the plate-shaped area | region 14 derived from (B) component, It is preferable to set it as the value within the range of 0.1-15 micrometers.

This reason is because when this width is made into the value below 0.1 micrometer, it may become difficult to show light diffusivity irrespective of the incident angle of incident light.

On the other hand, when such width becomes a value exceeding 15 micrometers, on the contrary, it may become difficult to show light diffusivity irrespective of the incident angle of incident light.

Therefore, it is more preferable to make each width S1, S2 of the plate-shaped area | region 12 derived from (A) component and the plate-shaped area | region 14 derived from (B) component into the value within the range of 0.5-10 micrometers. It is preferable to set it as the value within the range of 1-5 micrometers.

Moreover, it is preferable to make initial inclination-angle (theta) 4 in a louver structure into the value within the range of 0-80 degree.

This reason is because when such initial inclination-angle (theta) 4 becomes a value exceeding 80 degrees, it may become difficult to show incident angle dependence.

Therefore, it is more preferable to make initial inclination-angle (theta) 4 in a louver structure into the value within the range of 0-50 degrees.

Moreover, initial stage inclination-angle (theta) 4 means the angle of a narrow side among the formation angles of the normal of the film surface of an incident light irradiation side, and a louver, as shown in FIG.

More specifically, the initial inclination angle θ4 is a plate-like area when the angle with respect to the normal of the film plane to be measured is 0 ° when the film is cut into a plane perpendicular to the louver structure extending along the film plane direction. Means the angle of inclination (°).

In addition, as shown in FIG. 7, the inclination angle when the plate region is inclined to the left is negatively expressed based on the inclination angle when the plate region is inclined to the right.

Furthermore, in the anisotropic light-diffusion film 10 of this embodiment, as shown to FIG. 7 (a), the louver structure (film thickness direction length L1) may be formed in FIG. 7 (b), As shown, at least one of the upper end part and the lower end part of the film 10 may have a louver unformed part (film thickness direction length L2) in one side.

In addition, although length L1 of the film thickness direction in a louver structure is based also on the film thickness of the anisotropic light-diffusion film 10, it is preferable that it is a value within the range of 50-500 micrometers generally.

This reason is because when this length is set to a value of less than 50 µm, incident light that goes straight into the louver structure increases, and it may be difficult to obtain sufficient incidence angle dependency. On the other hand, when this length becomes the value exceeding 500 micrometers, it is because the loss of reflection, absorption, etc. of light may arise between the inside of a louver structure.

Therefore, it is more preferable to make the length of the film thickness direction L1 in a louver structure into the value within the range of 130-300 micrometers, and it is still more preferable to set it as the value within the range which is 150-250 micrometers.

In addition, although the width | variety L2 of the upper-lower end part in which a louver structure is not formed also depends on the film thickness of the anisotropic light-diffusion film 10, it is generally preferable that it is a value within the range of 0-200 micrometers, and is 0-100 micrometers. It is preferable that it is a value within a range, and it is more preferable that it is a value within the range of 0-50 micrometers.

Moreover, as shown in FIG.7 (c), it is also preferable that the louver structure is bent.

This is because the louver structure is bent, thereby reducing the incident light that goes straight inside the louver structure and improving the uniformity of light diffusion.

Moreover, although this curved louver structure can be obtained by irradiating light, changing the irradiation angle of irradiated light at the time of photocuring the composition for anisotropic light-diffusion films, to the kind of (A) component and (B) component, Depends heavily

Moreover, it is preferable to make refractive index of the plate-shaped area | region derived from (A) component in a louver structure into the value within the range of 1.5-1.7.

This reason is that when the refractive index of the plate-shaped region derived from the component (A) is less than 1.5, the difference with the refractive index of the plate-shaped region derived from the component (B) becomes too small, which makes it difficult to obtain desired anisotropy. Because there is. On the other hand, when the refractive index of the plate-shaped area | region derived from (A) component becomes a value exceeding 1.7, it is because compatibility with (B) component may become excessively low.

Therefore, it is more preferable to make the refractive index of the plate-shaped area | region derived from (A) component in a louver structure into the value within the range of 1.52-1.65, and it is still more preferable to set it as the value within the range of 1.55-1.6.

In addition, a refractive index can be measured according to JISK0062, for example.

Moreover, it is preferable to make the refractive index of the plate-shaped area | region derived from (B) component in louver structure into the value within the range of 1.4-1.5.

This reason is because when the refractive index of the plate-shaped area | region derived from (B) component is set to a value less than 1.4, the rigidity of the anisotropic light-diffusion film obtained may be reduced. On the other hand, when the refractive index of the plate-shaped area | region derived from (B) component becomes a value exceeding 1.5, the difference with the refractive index of the plate-shaped area | region derived from (A) component becomes too small, and it may become difficult to acquire desired anisotropy. Because.

Therefore, it is more preferable to make the refractive index of the plate-shaped area | region derived from (B) component in a louver structure into the value within the range of 1.42-1.48, and it is still more preferable to set it as the value within the range of 1.44-1.46.

In addition, a refractive index can be measured according to JISK0062, for example.

In addition, in the anisotropic light-diffusion film of this embodiment, the difference between the refractive index of the plate-shaped area | region derived from (A) component in a louver structure, and the refractive index of the plate-shaped area | region derived from (B) component is a value of 0.01 or more. It is preferable to set it as.

This reason is because when the difference in refractive index is a value less than 0.01, the angle angle at which the incident light totally reflects in the louver structure becomes narrow, and the spreading angle of the diffused light may be excessively narrowed.

Therefore, it is more preferable that the difference between the refractive index of the plate-shaped region derived from the component (A) in the louver structure and the refractive index of the plate-shaped region derived from the component (B) is a value of 0.03 or more.

Moreover, although the difference of refractive index is so preferable that it is large, about 0.1 is considered an upper limit.

4. Usage

8, it is preferable to use the anisotropic light-diffusion film of this invention for the reflection type liquid crystal display device 100. As shown in FIG.

This is because the anisotropic light-diffusion film of the present invention can efficiently diffuse external light so that it can be efficiently absorbed into the liquid crystal display device and used as a light source.

Therefore, the anisotropic light-diffusion film of this invention is arrange | positioned at the upper surface or lower surface of the liquid crystal cell 110 which consists of glass plates 104 and 108, the liquid crystal 106, and the mirror surface reflecting plate 107, etc., It is preferable to use it as the light-diffusion plate 103 in the reflective liquid crystal display device 100.

[Example]

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1

1. Synthesis of (B) Component

2 mol of isophorone diisocyanate (IPDI) as (a) component, and 2-hydroxyethyl as (c) component with respect to 1 mol of polypropylene glycol (PPG) of the weight average molecular weight 9,200 as component (b) in a container. After accommodating 2 mol of methacrylate (HEMA), it was polymerized according to a conventional method to obtain a polyetherurethane methacrylate having a weight average molecular weight of 9,900.

In addition, the weight average molecular weights of PPG and polyether urethane methacrylate are polystyrene conversion values measured according to the following conditions by gel permeation chromatography (GPC).

? GPC measuring device: manufactured by Tosoh Corporation, HLC-8020

? GPC column: manufactured by Tosoh Corporation (hereinafter, described in the order of passage)

TSK guard column HXL-H

TSK gel GMHXL (× 2)

TSK gel G2000HXL

 ? Measuring solvent: tetrahydrofuran

 ? Measuring temperature: 40 ℃

2. Preparation of Composition for Anisotropic Light Diffusion Film

Subsequently, o-phenylphenoxyethylacryl having a weight average molecular weight of 268 represented by the following formula (3) as the component (A) to 100 parts by weight of a polyether urethane methacrylate having a weight average molecular weight of 9,900 as the obtained (B) component. After adding 100 weight part of rates (Shin-Nakamura Chemical Co., Ltd. product, NK ester # A-LEN-10) and 10 weight part of 2-hydroxy-2-methylpropiophenone as (C) component, Heat mixing was performed on condition, and the composition for anisotropic light-diffusion films was obtained.

Here, the refractive index of (A) component and (B) component was measured according to JISK0062 according to ABE refractometer (made by Atago Co., Ltd., product name: ABE refractometer DR-M2, light source: Na light source, wavelength: 589 nm). .

In addition, below, the compound represented by Formula (3) may be called biphenyl-1.

3. Application of Composition for Anisotropic Light Diffusion Film

Next, the obtained composition for anisotropic light-diffusion films is apply | coated to the film-form transparent polyethylene terephthalate film (henceforth PET) as a process sheet | seat using an applicator, and the coating layer with a film thickness of 250 micrometers is applied. Got it.

4. Photocuring of Coating Layer

Subsequently, the ultraviolet irradiation device (I Graphics Corporation make, ECS-4011GX) with which the cold mirror for condensing was attached to the linear high pressure mercury lamp shown in FIG. 6 was prepared.

Subsequently, when a light shielding plate is provided in a heat ray cut filter image, and the ultraviolet-ray irradiated to the surface of an application layer makes the normal direction of the laminated body which consists of an application layer and PET when viewed from the longitudinal direction of the linear ultraviolet lamp set to 0 degrees. Was set such that the irradiation angle of ultraviolet light directly from the lamp (θ3 in FIG. 6 (b) was in the range of 0 to 10 ° (irradiation angle width θ3 '= 10 °).

At this time, the height of the lamp from the coating layer was set to 290 mm, and the peak illuminance was set to ⁹ mW / cm ² .

In addition, in order to prevent the reflected light from the light shielding plate or the like from being stray inside the irradiator and affecting the photocuring of the coating layer, the light shielding plate is also provided near the conveyor, and only the ultraviolet light emitted directly from the lamp is applied. Was set to be investigated.

Subsequently, ultraviolet-ray was irradiated along the conveyor, moving the coating layer to the right direction in FIG. 6 at the speed of 0.2 m / min, and the film thickness was 250 micrometers anisotropic light-diffusion film.

In addition, the film thickness of the anisotropic light-diffusion film was measured using the static pressure thickness measuring instrument (The Hosei Chemical Co., Ltd. product, Techlock # PG-02J).

Moreover, when the cross section of the anisotropic light-diffusion film was observed with the optical digital microscope (made by Keyence Co., Ltd.), the inclination angle (initial inclination angle) of the louver structure by the side of the film surface to which irradiation light first touches is 6.5 degrees, and the louver structure The length (L1 in FIG. 7B) in the film thickness direction was 200 μm.

5. Evaluation

(1) Evaluation of incident angle dependence by measurement

Light was made incident on the said film from below the anisotropic light-diffusion film obtained using the variable colorimeter (made by Suga Test Machine Co., Ltd.) (C light source, viewing angle 2 degrees).

Next, the brightness (%) of the diffused light diffused by the anisotropic light-diffusion film was measured every 5 degrees.

Next, the angle range between the measuring points of both ends whose difference in brightness between adjacent measurement points becomes less than 10% was made into the diffusion area, and the angle width of the said angle area was made into the spreading angle (degree) of diffused light.

In addition, when the incident angle of the incident light is 0 °, the average value of the difference between the diffusion region, the brightness value in the diffusion region, and the average value and the maximum value and minimum value of the brightness in the diffusion region is determined. And are shown in Table 1, respectively.

In addition, the incident angle of incident light was changed continuously, and the spread angle of the diffused light at each incident angle was measured, and the range of the incident angle in which the spread angle of the said diffused light was 10 degrees or more was made into the light-diffusion incident angle area | region. The obtained results are shown in Table 1.

Moreover, the larger the value of the spreading angle of diffused light means that the incident light incident at the incident angle at that time is effectively diffused by the anisotropic light diffusing film.

On the contrary, as the spreading angle of the diffused light becomes smaller, it means that light incident at the incident angle at that time passes through the anisotropic light diffusing film as it is and does not diffuse.

Moreover, about Example 1, 3, and 4, the characteristic curve which takes an incident angle (degree) with respect to an anisotropic light-diffusion film on a horizontal axis | shaft, and the spreading angle (degree) of diffused light to a vertical axis | shaft is shown in FIG. 9, respectively. .

For example, as in the case of Example 1, when there is no measurement plot when the spreading angle of the diffused light is 10 ° on the characteristic curve, the characteristic curve (external line) and the spreading angle of the diffused light = The value of the light-diffusion incidence angle region was obtained from the value of the incidence angle (°) at the intersection with a straight line of 10 degrees.

(2) Evaluation of Anisotropy by Visual

(2) -1 light diffusion

Five panelists evaluated the visible side in the case where the state of the opposite side was visually evaluated through the said film from the front surface (diffusion direction) of an anisotropic light-diffusion film, It was set as evaluation of the light diffusivity by visual acuity. The obtained results are shown in Table 1.

A: Five out of five judged to have sufficient opacity.

B: 3-4 of 5 judged that it has sufficient opacity.

C: Three to five of the five judged that the opacity was inferior, but the opacity itself.

D: 3-4 of 5 judged that they did not have opacity.

E: Five out of five determined that they had no opacity.

(2) -2 light transmittance

The five panelists evaluated the visible side in the case where the state of the opposite side was visually observed from the inclination 45 degree direction (transmission direction) of the anisotropic light-diffusion film according to the following criteria, and visually It was set as evaluation of the light transmittance by. The obtained results are shown in Table 1.

(Double-circle): 5 out of 5 judged that it was completely transparent and no coloration.

(Circle): It was judged that 3-4 of 5 people were completely transparent and no coloration.

(Triangle | delta): It was judged that 3-4 of 5 persons showed cloudy or yellow.

X: It was judged that 5 out of 5 people showed cloudiness or yellow.

EXAMPLE 2

In Example 2, the weight average molecular weight of the polyetherurethane methacrylate as the component (B) was changed to 6,100 by changing the component (b) to PPG having a smaller weight average molecular weight than in the case of Example 1. The composition for anisotropic light-diffusion films was produced like 1, the anisotropic light-diffusion film was manufactured, and evaluated. The obtained results are shown in Table 1.

Example 3

In Example 3, the weight average molecular weight of the polyetherurethane methacrylate as the component (B) was changed to 14,500 by changing the component (b) to PPG having a larger weight average molecular weight than that in Example 1. The composition for anisotropic light-diffusion films was produced like 1, the anisotropic light-diffusion film was manufactured, and evaluated. The obtained results are shown in Table 1.

Example 4

In Example 4, the anisotropic light-diffusion film was the same as in Example 1 except that the amount of the component (A) was added to 60 parts by weight based on 100 parts by weight of the component (B), and the amount of the component (C) was added to 20 parts by weight. The composition for manufacture was manufactured, the anisotropic light-diffusion film was produced, and it evaluated. The obtained results are shown in Table 1.

Example 5

In Example 5, the composition for anisotropic light-diffusion films was manufactured like Example 1 except having set the addition amount of (A) component into 150 weight part with respect to 100 weight part of (B) components, and manufacture an anisotropic light-diffusion film. And evaluated. The obtained results are shown in Table 1.

Example 6

In Example 6, when the component (B) is synthesized, the amount of the component (C) is added to 100 parts by weight of the component (B) using 2-hydroxyethyl acrylate (HEA) as the component (c). In addition, the composition for anisotropic light-diffusion films was produced similarly to Example 1, and the anisotropic light-diffusion film was produced and evaluated similarly to Example 1. The obtained results are shown in Table 1.

EXAMPLE 7

In Example 7, except that the film thickness of the anisotropic light-diffusion film was 500 micrometers, the composition for anisotropic light-diffusion films was produced like Example 6, and the anisotropic light-diffusion film was produced and evaluated. The obtained results are shown in Table 1.

Example 8

In Example 8, the addition amount of the component (C) was changed to 4 parts by weight with respect to 100 parts by weight of the component (B), and the anisotropic property was the same as in Example 6 except that the film thickness of the anisotropic light-diffusion film was set to 500 µm. The composition for light-diffusion films was produced, the anisotropic light-diffusion film was manufactured, and evaluated. The obtained results are shown in Table 1.

EXAMPLE 9

In Example 9, the addition amount of the component (C) was changed to 2 parts by weight with respect to 100 parts by weight of the component (B), and the anisotropic property was the same as in Example 6 except that the film thickness of the anisotropic light-diffusion film was set to 500 µm. The composition for light-diffusion films was produced, the anisotropic light-diffusion film was manufactured, and evaluated. The obtained results are shown in Table 1.

Example 10

In Example 10, the composition for anisotropic light-diffusion films was prepared in the same manner as in Example 1, except that (A) component was used an o-phenylphenoxyethoxyethyl acrylate having a weight average molecular weight of 312 represented by the following formula (4). And the anisotropic light-diffusion film was produced and evaluated. The obtained results are shown in Table 1.

In addition, below, the compound represented by Formula (4) may be called biphenyl-2.

Example 11

In Example 11, the composition for anisotropic light-diffusion films was prepared similarly to Example 1 except having set (A) component to the mixture whose biphenyl 1 and biphenyl 2 are 50:50 (weight ratio), and an anisotropic light-diffusion film was prepared It manufactured and evaluated. The obtained results are shown in Table 1.

Comparative Example 1

In Comparative Example 1, the component (B) was changed to 2-acryloyloxyethyl succinate (weight average molecular weight: 216) (manufactured by Shin-Nakamura Chemical Co., Ltd., NK ester A-SA). The composition for anisotropic light-diffusion films was produced like Example 1 except having made the addition amount of 20 weight part with respect to 100 weight part of (B) components, and making the film thickness of anisotropic light-diffusion film into 500 micrometers, An anisotropic light-diffusion film was produced and evaluated. The obtained results are shown in Table 1.

Comparative Example 2

In the comparative example 2, when synthesize | combining the polyetherurethane methacrylate as (B) component, while using 2-hydroxyethyl acrylate (HEA) as a component (c), the weight average of polyetherurethane methacrylate is used. The composition for anisotropic light-diffusion films was produced like Example 1, and the anisotropic light-diffusion film was produced and evaluated except the molecular weight was changed to 740, and the film thickness of the anisotropic light-diffusion film was 500 micrometers. The obtained results are shown in Table 1.

Table 1

As mentioned above, according to this invention, the urethane (meth) acrylate which consists of (meth) acrylic acid ester containing a some aromatic ring, and predetermined | prescribed structural component, and has a predetermined weight average molecular weight After mix | blending in a predetermined ratio, by photocuring, the anisotropic light-diffusion film which has favorable incidence angle dependence can be obtained.

More specifically, it is possible to obtain an anisotropic light diffusing film having a good incidence angle dependency in the transmission and diffusion of light and having a wide light diffusion incident angle region.

Therefore, the composition for anisotropic light-diffusion film of this invention, etc. can be applied also to a viewing angle control film, a viewing angle expansion film, and also a projection screen in addition to the light control film in a reflection type liquid crystal display device, It is expected to contribute significantly.

One … 2 coating layer; Process sheet, 10... Anisotropic light diffusing film, 12. 14 A plate-like region with a relatively high refractive index derived from component (A). 20.. Platelet region having a relatively low refractive index derived from component (B). Ultraviolet irradiation device, 21. Hot wire cut filter, 22.. Cold mirror, 23... Light shielding plate, 25. UV lamps 50 (52, 54, 56) onboard; Incident light (active energy ray), 100. Reflective liquid crystal display, 101. Polarizer 102. Retardation plate, 103. Light diffusion plate, 104. Glass plate, 105. Color filter 106. Liquid crystal, 107... Mirror reflector, 108. Glass plate, 110... Liquid crystal cell

Claims (10)

The composition for anisotropic light-diffusion films containing the (meth) acrylic acid ester containing the some aromatic ring as (A) component, and the urethane (meth) acrylate whose weight average molecular weight as (B) component is a value within the range of 3,000-20,000. as,
Urethane (meth) acrylate as said (B) component originates in the following (a)-(c) component as a structural component, and also in a molar ratio (a) component: (b) component: (c) component = 1 In addition to being a compound of the ratio of 5: 1: 1-5,
Content of the said (A) component is made into the value within the range of 25-400 weight part with respect to 100 weight part of said (B) components, The composition for anisotropic light-diffusion films characterized by the above-mentioned.
(a) Compounds containing two isocyanate groups via aliphatic rings
(b) polyalkylene glycol
(c) hydroxyalkyl (meth) acrylate The method of claim 1,
It contains the said (A) component independently as a monomer component, and contains the said (B) component independently as an oligomer component, The composition for anisotropic light-diffusion films characterized by the above-mentioned. The method of claim 1,
(C) component as a structural component of said (B) component is hydroxyalkyl methacrylate, The composition for anisotropic light-diffusion films characterized by the above-mentioned. The method of claim 1,
The refractive index of the said (B) component is made into the value within the range of 1.4-1.5, The composition for anisotropic light-diffusion films characterized by the above-mentioned. The method of claim 1,
The said (A) component contains a biphenyl ring as a some aromatic ring, The composition for anisotropic light-diffusion films characterized by the above-mentioned. The method of claim 1,
The weight average molecular weight of the said (A) component is made into the value within the range of 200-2500, The composition for anisotropic light-diffusion films characterized by the above-mentioned. The method of claim 1,
The refractive index of the said (A) component is made into the value within the range of 1.5-1.65, The composition for anisotropic light-diffusion films characterized by the above-mentioned. The method of claim 1,
While containing a photoinitiator as (C) component, let it be the value within the range of 0.2-20 weight% with respect to the total amount (100 weight%) of the said (A) component and (B) component. The composition for anisotropic light-diffusion film characterized by the above-mentioned. In the anisotropic light-diffusion film formed by irradiating an active energy ray with respect to the composition for anisotropic light-diffusion films,
The urethane (meth) acrylate in which the said composition for anisotropic light-diffusion films contains the (meth) acrylic acid ester which contains several aromatic rings as (A) component, and the weight average molecular weight as (B) component is a value within the range of 3,000-20,000. As a composition for anisotropic light-diffusion films containing
Urethane (meth) acrylate as said (B) component originates in the following (a)-(c) component as a structural component, and also in a molar ratio (a) component: (b) component: (c) component = 1 In addition to being a compound of the ratio of 5: 1: 1-5,
Content of the said (A) component is made into the value within the range of 25-400 weight part with respect to 100 weight part of said (B) components, The anisotropic light-diffusion film characterized by the above-mentioned.
(a) Compounds containing two isocyanate groups via aliphatic rings
(b) polyalkylene glycol
(c) hydroxyalkyl (meth) acrylate 10. The method of claim 9,
The film thickness is made into the value within the range of 100-500 micrometers, The anisotropic light-diffusion film characterized by the above-mentioned.

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