JPWO2014133147A1 - Optical film, polarizing plate and image display device - Google Patents

Abstract

An object of the present invention is to provide an image display device with reduced crosstalk and excellent durability, and a polarizing plate and an optical film used therefor. The optical film of the present invention is an optical film having a substrate film, a low moisture permeable layer, and a patterned optically anisotropic layer, satisfying the following formula (1), and having a moisture permeability of 120 g / m 2 / It is an optical film that is not more than day. A / B ≦ 0.6 (1) (In the formula, A represents the moisture permeability of the laminate in which the base film and the low moisture permeability layer are laminated, and B represents the moisture permeability of the base film. Represents.)

Description

  The present invention relates to an optical film, a polarizing plate using the same, and an image display device.

A stereoscopic (3D) image display device that displays a stereoscopic image requires, for example, an optical member for making a right-eye image and a left-eye image into circularly polarized images in opposite directions.
As such an optical member, for example, a patterned optical anisotropic element in which regions having different slow axes and retardations are regularly arranged in a plane is used.
The support used for this pattern optical anisotropic element is classified into two types: a support made of glass and a support made of a film.
Here, the support made of glass has a temperature / humidity over time (hereinafter referred to as “temperature / humidity”) as compared with a support made of a film. In recent years, it has been widely used because it has the advantage of suppressing expansion and contraction due to changes, but in recent years, from the viewpoint of handling, thinning, and weight reduction, a pattern retardation film (Film) using a support made of a film is used. Attention has been paid to Patterned Retarder (FPR).

For example, in Patent Document 1, a transparent resin film having a humidity expansion coefficient of 5 × 10 ⁻⁵ /% RH or more is used as a support, and the directions of slow axes are different from each other and are regularly arranged in the plane of the transparent resin film. A phase difference element having a phase difference layer having two or more types of phase difference regions has been proposed. By controlling the humidity of the transparent resin film, the expansion / contraction of FPR is suppressed, and the phase difference element is displayed. Improves accuracy when pasting to the panel.

JP 2011-22419 A

  However, after the retardation element described in Patent Document 1 is bonded to the display panel, the transparent resin film expands and contracts due to a change in temperature and humidity in the usage environment of the stereoscopic image display device, thereby forming a transparent resin film. There is a problem that the pattern and pixels of the retardation region of the supported retardation layer are misaligned and crosstalk occurs, and the retardation element is peeled off or floated due to expansion / contraction of the transparent resin film. It was found that there was a problem that it was inferior in durability.

  Therefore, an object of the present invention is to provide an image display device with reduced crosstalk and excellent durability, and a polarizing plate and an optical film used therefor.

  Means for solving the above problems are as follows.

[1] An optical film having a base film, a low moisture-permeable layer, and a patterned optically anisotropic layer,
1 An optical film satisfying the following formula (1) and having a moisture permeability of 120 g / m ² / day or less.
A / B ≦ 0.6 (1)
(In formula, A represents the water vapor transmission rate of the laminated body which laminated | stacked the base film and the low moisture-permeable layer, and B represents the water vapor transmission rate of a base film.)
[2] At least one compound (A) selected from the group consisting of the compound (A1) having a cycloaliphatic hydrocarbon group and the compound (A2) having a fluorene ring in the low moisture-permeable layer is excluded from the inorganic component. The optical film according to [1], which is contained in an amount of 50 to 99% by mass with respect to the total solid content.
[3] The optical film as described in [2], wherein the cyclic aliphatic hydrocarbon group of the compound (A1) is a group represented by the following general formula (I).

(In the formula, L and L ′ each independently represent a divalent or higher valent linking group, and n represents an integer of 1 to 3.)
[4] The optical film according to [2] or [3], wherein the low moisture-permeable layer further contains a rosin compound (B).
[5] The optical film according to any one of [2] to [4], wherein the low moisture-permeable layer further contains inorganic fine particles (C) having an average particle diameter of 30 nm or more and 100 nm or less.
[6] The optical film according to any one of [1] to [5], wherein the low moisture-permeable layer contains 50 to 99% by mass of the cyclic polyolefin resin (D).
[7] The optical film according to [6], wherein an adhesive layer is provided between the low moisture-permeable layer and the low moisture-permeable layer among the base film and the patterned optically anisotropic layer.

[8] A polarizing plate comprising the optical film according to any one of [1] to [7] and a polarizer.
[9] The polarizing plate according to [8], in which an optical film is disposed on one main surface of the polarizer and an acrylic film is disposed on the other main surface of the polarizer.

  [10] An image display device comprising the polarizing plate according to [8] or [9], wherein an optical film included in the polarizing plate is disposed as an outermost surface.

  According to the present invention, it is possible to provide an image display device with reduced crosstalk and excellent durability, and a polarizing plate and an optical film used therefor.

1A to 1C are schematic cross-sectional views showing an example of the optical film of the present invention. 2A and 2B are schematic cross-sectional views showing an example of the polarizing plate (front polarizing plate) of the present invention. FIG. 3 is a schematic diagram showing an example of the polarizing plate (patterned circularly polarizing plate) of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the image display device of the present invention.

Hereinafter, the present invention will be described in detail.
The description of the constituent elements described below may be made based on typical embodiments of the present invention, but the present invention is not limited to such embodiments.
In the present specification, a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
The “acrylic resin” means a resin obtained by polymerizing a methacrylic acid or a derivative of acrylic acid, and a resin containing the derivative.
Further, unless specifically limited, “(meth) acrylate” represents a concept including both acrylate and methacrylate, and “(meth) acryl” represents a concept including both acrylic and methacrylic.
Also, the “slow axis direction” of the film is the direction in which the refractive index is maximum within the film plane, and the “fast axis direction” means the direction perpendicular to the slow axis within the film plane. To do.
Next, terms used in this specification will be described.

[Moisture permeability]
The “moisture permeability” in the present invention is 24 under the conditions of a temperature of 40 ° C. and a relative humidity of 90% according to the method described in “Moisture permeability test method of moisture-proof packaging material (cup method)” of JIS Z 0208: 1976. It refers to the amount of water vapor (g / m ² / day) that has passed in time.

[Retardation]
Re (λ) and Rth (λ) represent in-plane retardation and retardation in the thickness direction at the wavelength λ, respectively.
Re (λ) is measured by making light having a wavelength of λ nm incident in the normal direction of the film in KOBRA 21ADH or KOBRA WR (both manufactured by Oji Scientific Instruments). In selecting the measurement wavelength λnm, the wavelength selection filter can be exchanged manually, or the measurement value can be converted by a program or the like.
Here, when the film to be measured is represented by a uniaxial or biaxial refractive index ellipsoid, Rth (λ) is calculated by the following method.
Rth (λ) is the film surface when Re (λ) is set to the in-plane slow axis (determined by KOBRA 21ADH or KOBRA WR) as the tilt axis (rotary axis). Measurement is performed at a total of 6 points by injecting light of wavelength λ nm from each inclined direction in steps of 10 degrees from the normal direction to 50 ° on one side with respect to the film normal direction (with any rotation direction as the rotation axis). Then, KOBRA 21ADH or KOBRA WR is calculated based on the measured retardation value, the assumed value of the average refractive index, and the input film thickness value. In the above case, in the case of a film having a direction in which the retardation value is zero at a certain tilt angle with the in-plane slow axis from the normal direction as the rotation axis, retardation at a tilt angle larger than the tilt angle. The value is calculated by KOBRA 21ADH or KOBRA WR after changing its sign to negative. The retardation value is measured from two inclined directions with the slow axis as the tilt axis (rotation axis) (if there is no slow axis, the arbitrary direction in the film plane is the rotation axis). Rth can also be calculated from the following formula (A) and formula (B) based on the value, the assumed value of the average refractive index, and the input film thickness value.

Note that Re (θ) represents a retardation value in a direction inclined by an angle θ from the normal direction. In the formula (A), nx represents the refractive index in the slow axis direction in the plane, ny represents the refractive index in the direction orthogonal to nx in the plane, and nz is the direction orthogonal to nx and ny. Represents the refractive index. d is the film thickness.
Rth = ((nx + ny) / 2−nz) × d (Equation (B)

On the other hand, when the film to be measured cannot be expressed by a uniaxial or biaxial refractive index ellipsoid, that is, a film having no so-called optical axis, Rth (λ) is calculated by the following method. The
Rth (λ) is from −50 ° with respect to the film normal direction, with Re (λ) being the in-plane slow axis (determined by KOBRA 21ADH or KOBRA WR) as the tilt axis (rotary axis). Measured at 11 points with light of wavelength λ nm incident in 10 ° steps up to + 50 °, respectively, and based on the measured retardation value, average refractive index assumption and input film thickness value KOBRA 21ADH or KOBRA WR is calculated. In the above measurement, as the assumed value of the average refractive index, values in the polymer handbook (John Wiley & Sons, Inc.) and catalogs of various optical films can be used. If the average refractive index is not known, it can be measured with an Abbe refractometer. The average refractive index values of main optical films are exemplified below: cellulose acylate (1.48), cycloolefin polymer (1.52), polycarbonate (1.59), polymethyl methacrylate (1.49), Polystyrene (1.59). By inputting the assumed value of the average refractive index and the film thickness, KOBRA 21ADH or KOBRA WR calculates nx, ny, and nz. Nz = (nx−nz) / (nx−ny) is further calculated from the calculated nx, ny, and nz.

In the present specification, “visible light” means 380 nm to 780 nm.
Moreover, in this specification, when there is no special mention about a measurement wavelength, a measurement wavelength is 550 nm.
Further, in this specification, an angle (for example, an angle such as “90 °”) and a relationship thereof (for example, “orthogonal”, “parallel”, “intersection at 45 °”, etc.) are allowable in the technical field to which the present invention belongs. The range of errors to be included. For example, it means that the angle is within the range of strict angle ± 10 °, and the error from the strict angle is preferably 5 ° or less, and more preferably 3 ° or less.

1. Optical film TECHNICAL FIELD This invention is an optical film which has a base film, a low moisture-permeable layer, and a pattern optically anisotropic layer, Comprising: The following formula (1) is satisfied, and a moisture permeability is 120 g / m < ² > /. It is related with the optical film which is below day.
A / B ≦ 0.6 (1)
(In formula, A represents the water vapor transmission rate of the laminated body which laminated | stacked the base film and the low moisture-permeable layer, and B represents the water vapor transmission rate of a base film.)

The present inventors employ an optical film that satisfies the above formula (1) by providing a low moisture-permeable layer and has a moisture permeability of 120 g / m ² / day or less, thereby cross-talking an image display device. Has been found to be reduced and the durability will be good.
Although this is not clear in detail, it is considered that the shrinkage / expansion of the base film and the polarizer can be suppressed with respect to the change of the temperature and humidity in the usage environment of the image display apparatus.

A schematic cross-sectional view of an example of the optical film of the present invention is shown in FIG.
In addition, the figure in this invention is a schematic diagram, and the relationship of the thickness of each layer, positional relationship, etc. do not necessarily correspond with an actual thing. The same applies to the following figures.
The optical film 10 shown in FIG. 1 has a base film 12, a low moisture permeable layer 14, a patterned optical anisotropic layer 16, and an optional antireflection layer 18.
Here, as shown in FIGS. 1A to 1C, the optical film of the present invention includes a base film 12, a low moisture permeable layer 14, a patterned optical anisotropic layer 16, and an optional hard coat. The layer configuration (order) with the layer 18 is not particularly limited, but the configuration shown in FIGS. 1A to 1C is preferable.

In the optical film of the present invention, the moisture permeability of the entire layer including the low moisture permeability layer is 120 g / m ² / day or less, preferably 100 g / m ² / day or less, and preferably 50 g / m ² / day. The following is more preferable.
By setting the moisture permeability to the above value, the crosstalk of the image display device is further reduced and the durability becomes better.

In addition, the optical film of the present invention preferably has a retardation of the pattern optical anisotropic layer of about λ / 4 because it can be approximated to accurate circularly polarized light in an image display device. Re (550) is preferably 110 nm to 165 nm.
Similarly, the optical film of the present invention has an in-plane slow axis direction and a pattern optically anisotropic layer for the reason that it is possible to produce clockwise circularly polarized light and counterclockwise circularly polarized light respectively in an image display device. Optically anisotropic layer in which at least one of in-plane retardation includes first and second retardation regions different from each other, and the first and second retardation regions are alternately arranged in the surface It is preferable that

2. Polarizing plate The present invention also relates to a polarizing plate having the optical film of the present invention and a polarizer.

FIG. 2 shows a schematic cross-sectional view of an example of the polarizing plate of the present invention.
A polarizing plate 20 shown in FIG. 2 includes the optical film 10 of the present invention and a polarizer 22.
Here, in FIG. 2 (and FIG. 4 described later), the configuration shown in FIG. 1A (hereinafter also abbreviated as “configuration A”) is adopted as the configuration of the optical film 10, but FIG. The configuration shown in FIG. 1B (hereinafter also referred to as “configuration B”) or the configuration shown in FIG. 1C (hereinafter also referred to as “configuration C”) may be used.
Here, since the hard coat layer can be eliminated by imparting hard coat properties to the low moisture permeable layer, the structure A is preferable from the viewpoint of a thin layer design, and the structure B is oriented to FPR in the low moisture permeable layer It is preferable from the viewpoint that the number of steps can be reduced by imparting a layer function, and the configuration C can impart easy adhesion between the polarizing plate and the polarizer to the low moisture permeable layer, and improves the workability of the polarizing plate. It is preferable from the viewpoint that can be made. Of these, the configuration A is more preferable.
Moreover, the polarizing plate of this invention may have the polarizer protective film which protects a polarizer, and as shown to FIG. 2 (A), it is polarized on the surface and back surface of the polarizer (viewing side) 22. It may be an embodiment having the child protective films 24 and 26 (hereinafter also abbreviated as “FPR externally attached type”). As shown in FIG. 2B, the polarizer protective film 26 is formed only on the back surface of the polarizer 22. (Hereinafter also abbreviated as “FPR integrated type”), and preferably an FPR integrated type.
Here, each layer may be bonded through an adhesive or an adhesive (not shown).

The polarizing plate of the present invention can be used as a patterned circularly polarizing plate.
A schematic diagram of an example of the patterned circularly polarizing plate of the present invention is shown in FIG.
In the patterned circularly polarizing plate 30 shown in FIG. 3, the phase difference between the first retardation region 16a and the second retardation region 16b in the patterned optically anisotropic layer 16 is about λ / 4, and the slow axes 17a and 17b. The slow axes 17a and 17b of the first retardation region 16a and the second retardation region 16b and the absorption axis 23 of the polarizer 22 intersect at 45 ° with respect to the optical film 10 whose directions of 90 ° are different from each other (first When the slow axes 17a and 17b of the first phase difference region 16a and the second phase difference region 16b are 45 °, respectively, the absorption axis 23 of the polarizer 22 is arranged to be 0 °.
With the pattern circularly polarizing plate having such a configuration, light that has passed through each of the first phase difference region and the second phase difference region becomes a circularly polarized state in opposite directions, and circularly polarized images for the right eye and the left eye, respectively. Form.

3. Image display apparatus TECHNICAL FIELD This invention relates also to the image display apparatus (stereoscopic image display apparatus) using the optical film or polarizing plate of this invention.
The image display device of the present invention has the polarizing plate of the present invention, the optical film of the present invention is disposed as the outermost surface (viewing side), and has an image display panel.

In the present invention, the image display panel in the image display device is not particularly limited. For example, a liquid crystal panel including a liquid crystal layer, an organic EL display panel including an organic EL layer, a plasma display panel, Also good. For any aspect, various possible configurations can be employed.
Moreover, in the aspect which has the polarizer for image display on the visual recognition side of an image display panel, such as a transmissive mode liquid crystal panel, the polarizer is utilized as a polarizer in the polarizing plate of this invention, and the polarizing plate of this invention is used. Also preferred is an embodiment that doubles as a viewing-side polarizing plate in the image display device.

Similarly, the configuration of the liquid crystal cell in the image display device is not particularly limited, and a liquid crystal cell having a general configuration can be adopted.
The liquid crystal cell includes, for example, a pair of substrates arranged opposite to each other and a liquid crystal layer sandwiched between the pair of substrates, and may include a color filter layer, if necessary. The driving mode of the liquid crystal cell is not particularly limited, and twisted nematic (TN), super twisted nematic (STN), vertical alignment (VA), in-plane switching (IPS), optically compensated bend cell (OCB) Various modes such as can be used.

FIG. 4 shows a schematic cross-sectional view of a liquid crystal display device which is an example of the image display device of the present invention.
In the liquid crystal display device 40 shown in FIG. 4, the polarizing plate 20 of the present invention is disposed so that the optical film 10 of the present invention becomes the outermost surface (viewing side).
Further, polarizer protective films 46 and 48 are disposed on the front and back surfaces of the polarizer (backlight side) 44, respectively. In addition, about the polarizer protective films 44 and 46, it is good also as an optical compensation film according to the drive mode of a liquid crystal cell.
Here, each layer may be bonded through an adhesive or an adhesive (not shown).

4). Stereoscopic image display system The present invention also includes a stereoscopic image display device according to the present invention and a polarizing plate disposed on the viewing side of the stereoscopic image display device, and a stereoscopic image display system that visually recognizes a stereoscopic image through the polarizing plate. Related.
An example of the polarizing plate disposed outside the viewing side of the stereoscopic image display device is polarized glasses worn by an observer. The observer observes the right-eye and left-eye polarized images displayed by the stereoscopic image display device through circularly polarized light or linearly polarized glasses and recognizes them as a stereoscopic image.

  Hereinafter, various members used in the optical film of the present invention will be described in detail.

Low moisture permeability layer:
The low moisture-permeable layer in the optical film of the present invention is a layer provided separately from the base film, the patterned optically anisotropic layer and any antireflection layer, and the optical film having this low moisture-permeable layer is as follows. The expression (1) is satisfied.
A / B ≦ 0.6 (1)
(In formula, A represents the water vapor transmission rate of the laminated body which laminated | stacked the base film and the low moisture-permeable layer, and B represents the water vapor transmission rate of a base film.)

The above formula (1) indicates that the moisture permeability A of the laminate obtained by laminating the base film and the low moisture permeability layer is lower than the moisture permeability B of the base film at a specific rate, that is, the low moisture permeability layer. It can be said that it is a regulation regarding performance of
Here, A in the above formula (1) represents the moisture permeability of the laminate obtained by laminating the base film and the low moisture permeability layer as described above. This is the optical film of the present invention. It does not mean that the base film and the low moisture permeability layer are laminated adjacent to each other.
As shown in the above-described knowledge, the optical film of the present invention satisfies the above formula (1), thereby reducing the crosstalk of the image display device and improving the durability.

  In addition, A / B in the above formula (1) is preferably 0.5 or less, more preferably 0.4 or less, particularly 0.3 or less when the base film is a cellulose acylate film described later. Is preferable, and it is more preferable that it is 0.2 or less.

[First aspect]
The low moisture-permeable layer is a compound (A1) having a cyclic aliphatic hydrocarbon group because the moisture permeability of the optical film is further reduced, the crosstalk of the image display device is further reduced, and the durability is improved. And at least one compound (A) selected from the group consisting of a compound having a fluorene ring (A2) is a layer containing 50 to 99% by mass with respect to the total solid content excluding inorganic components (first embodiment) ) Is preferred.

Here, the content of the compound (A) in the low moisture-permeable layer (in the case where any one of the compound (A1) and the compound (A2) is contained, the content is referred to as the compound (A1) and the compound (A2). In the case where both are included, the total content is the same. Hereinafter, the same can be measured by a method of combining pyrolysis GC-MS and elemental analysis. In addition, it can measure similarly about content of the rosin compound (B) mentioned later, an inorganic fine particle (C), and cyclic polyolefin resin (D).
The content of the compound (A) in the low moisture permeable layer is more preferably more than 50% by mass and 99% by mass or less, further preferably 55% by mass to 95% by mass, and more preferably 60% by mass to 90%. A mass% is particularly preferred.

In addition, the low moisture permeable layer further reduces the moisture permeability of the optical film, further reduces crosstalk of the image display device, and further improves the durability. A layer containing the rosin compound (B) and / or inorganic fine particles (C) having an average particle size of 30 nm to 100 nm is more preferable.
Here, the content of the rosin compound (B) in the low moisture-permeable layer is preferably 1% by mass to 50% by mass, more preferably 10% by mass to 40% by mass, and 15% by mass to 30%. More preferably, it is mass%.
Similarly, the content of the inorganic fine particles (C) in the low moisture permeable layer is preferably 10% by mass to 80% by mass, more preferably 15% by mass to 75% by mass, and 20% by mass to 70% by mass. More preferably, it is mass%.

Such a low moisture-permeable layer according to the first aspect comprises a compound (a1) having a cycloaliphatic hydrocarbon group and an unsaturated double bond group and / or a fluorene ring and an unsaturated double bond group, which will be described later. It is formed by curing a curable composition containing the compound (a2), the rosin compound (B), the inorganic fine particles (C) and the like (hereinafter also abbreviated as “curable composition for low moisture permeable layer”). Preferably, the layer is
In addition, the curable composition for a low moisture-permeable layer further contains other compound (a3) having an unsaturated double bond group, an inorganic layered compound, a polymerization initiator, an ultraviolet absorber, a solvent and the like as necessary. May be. Each component will be described below.

[Compound (a1) having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group]
A compound having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group can function as a binder.
By forming a low moisture permeable layer using a compound having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group, low moisture permeability can be realized, and the substrate film or patterned optically anisotropic layer and the low permeability can be realized. The adhesiveness with the wet layer is excellent, and as a result, the crosstalk of the image display device is further reduced and the durability becomes better. Although the details are not clear, by using a compound having a cycloaliphatic hydrocarbon group in the molecule, a hydrophobic cycloaliphatic hydrocarbon group is introduced into the low moisture-permeable layer, and is hydrophobized. It can prevent the uptake of molecules and reduce the water vapor transmission rate. Moreover, by having an unsaturated double bond group in a molecule | numerator, a crosslinking point density is raised and the diffusion path | route of the water molecule in a low moisture-permeable layer is restrict | limited. Increasing the crosslink point density also has the effect of relatively increasing the density of the cyclic aliphatic hydrocarbon group, making the inside of the low moisture permeable layer more hydrophobic, preventing the adsorption of water molecules, and reducing the moisture permeability. it is conceivable that.
In order to increase the crosslinking point density, the number of unsaturated double bond groups in the molecule is more preferably 2 or more.

The cyclic aliphatic hydrocarbon group is preferably a group derived from an alicyclic compound having 7 or more carbon atoms, more preferably a group derived from an alicyclic compound having 10 or more carbon atoms, and further preferably Is a group derived from an alicyclic compound having 12 or more carbon atoms.
The cycloaliphatic hydrocarbon group is particularly preferably a group derived from a polycyclic compound such as bicyclic or tricyclic.
More preferably, the central skeleton of the compound described in the claims of JP-A No. 2006-215096, the central skeleton of the compound described in JP-A No. 2001-10999, or the skeleton of an adamantane derivative may be mentioned. It is done.

  As the cyclic aliphatic hydrocarbon group (including a linking group), a group represented by any one of the following general formulas (I) to (V) is preferable, and in the following general formula (I), (II) or (IV) The group represented is more preferable, and the group represented by the following general formula (I) is more preferable.

  In general formula (I), L and L ′ each independently represent a divalent or higher linking group. n represents an integer of 1 to 3.

  In general formula (II), L and L ′ each independently represent a divalent or higher linking group. n represents an integer of 1 to 2.

  In general formula (III), L and L ′ each independently represent a divalent or higher linking group. n represents an integer of 1 to 2.

  In general formula (IV), L and L ′ each independently represent a divalent or higher valent linking group, and L ″ represents a hydrogen atom or a divalent or higher valent linking group.

  In general formula (V), L and L ′ each independently represent a divalent or higher linking group.

  Specific examples of the cycloaliphatic hydrocarbon group include norbornyl, tricyclodecanyl, tetracyclododecanyl, pentacyclopentadecanyl, adamantyl, diamantanyl and the like.

The unsaturated double bond group is preferably an ethylenically unsaturated double bond group. Specifically, for example, a polymerizable functional group such as a (meth) acryloyl group, a vinyl group, a styryl group, and an allyl group. Among them, (meth) acryloyl group and —C (O) OCH═CH ₂ are preferable. Particularly preferably, a compound containing two or more (meth) acryloyl groups in one molecule described below can be used.

A compound having a cycloaliphatic hydrocarbon group and having two or more unsaturated double bond groups in the molecule has the above-described cycloaliphatic hydrocarbon group and group having an unsaturated double bond as a linking group. It is comprised by connecting via.
Examples of the linking group include a single bond, an alkylene group having 1 to 6 carbon atoms which may be substituted, an amide group which may be substituted at the N position, a carbamoyl group which may be substituted at the N position, and an ester. Groups, oxycarbonyl groups, ether groups, and the like, and groups obtained by combining these groups.

These compounds include, for example, polyols such as diols and triols having the above cyclic aliphatic hydrocarbon groups, and carboxylic acids and carboxylic acid derivatives of compounds having (meth) acryloyl groups, vinyl groups, styryl groups, allyl groups, etc. It can be easily synthesized by a one-step or two-step reaction with an epoxy derivative, an isocyanate derivative or the like.
Specifically, compounds such as (meth) acrylic acid, (meth) acryloyl chloride, (meth) acrylic anhydride, glycidyl (meth) acrylate, and compounds described in WO2012 / 00316A (for example, 1, 1-bis (acryloxymethyl) ethyl isocyanate and the like) can be synthesized by reacting with the above polyol having a cyclic aliphatic hydrocarbon group.

  Hereinafter, preferred specific examples of the compound having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group will be shown, but the present invention is not limited thereto.

[Compound (a2) having a fluorene ring and an unsaturated double bond group]
A compound having a fluorene ring and an unsaturated double bond group can function as a binder.
Moreover, the compound which has a fluorene ring and an unsaturated double bond group can function as a hardening | curing agent, and can implement | achieve low moisture permeability while improving the intensity | strength and abrasion resistance of a coating film.
In order to increase the crosslinking point density, the number of unsaturated double bond groups in the molecule is more preferably 2 or more. Moreover, like the compound (a1), the unsaturated double bond group is preferably an ethylenically unsaturated double bond group.

  The compound having a fluorene ring and an unsaturated double bond group is preferably represented by the following general formula (VI).

(In the formula (VI), R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represents a monovalent substituent, and m, n, p and q are each independently 0 Represents an integer of ˜4, and at least one of R ¹ and R ² represents a monovalent organic group having an ethylenically unsaturated group.

  The compound having a fluorene skeleton and an unsaturated double bond in the molecule is preferably represented by the following general formula (VII).

(In the formula, R ₇ and R ₈ each independently represent hydrogen or a methyl group, and r and s each independently represent an integer of 0 to 5)

  The above-mentioned compound (A) is preferably 50% by mass to 99% by mass and more than 50% by mass and 99% by mass or less based on the total solid content excluding the inorganic components of the curable composition for a low moisture permeable layer. It is more preferable that it is 55 mass%-95 mass%, and it is especially preferable that it is 60 mass%-90 mass%.

[Rosin compound (B)]
The rosin compound (B) is preferably at least one selected from, for example, rosin, hydrogenated rosin, acid-modified rosin and rosin ester.
Specific examples of the rosin include, for example, unmodified such as tall oil rosin, gum rosin, and wood rosin mainly composed of a resin acid such as abietic acid, levopimaric acid, pulse trinic acid, neoabietic acid, dehydroabietic acid, and dihydroabietic acid. Rosin is mentioned.
Specific examples of the hydrogenated rosin include a hydrogenated rosin.
Specific examples of the acid-modified rosin include unsaturated acid-modified rosins obtained by adding an unsaturated acid such as maleic acid, fumaric acid or acrylic acid by Diels-Alder addition reaction, and more specifically, Examples thereof include maleopimaric acid obtained by adding maleic acid to rosin, fumaropimaric acid obtained by adding fumaric acid, and acrylopimaric acid obtained by adding acrylic acid.
Specific examples of the rosin ester include glycerin ester obtained by esterifying rosin and glycerin, and pentaerythritol ester obtained by esterifying with pentaerythritol.

Commercially available products of the rosin ester include super ester E-720, super ester E-730-55, super ester E-650, super ester E-786-60, tamanol E-100, emulsion AM-1002, and emulsion SE-. 50 (all trade names, special rosin ester emulsion, manufactured by Arakawa Chemical Industries, Ltd.), super ester L, super ester A-18, super ester A-75, super ester A-100, super ester A-115, super Examples include ester A-125 and super ester T-125 (all trade names, special rosin esters, manufactured by Arakawa Chemical Industries, Ltd.).
As commercially available products of rosin ester, ester gum AAG, ester gum AAL, ester gum A, ester gum AAV, ester gum 105, ester gum HS, ester gum AT, ester gum H, ester gum HP, ester gum HD, Pencel A, Pencel AD, Pencel AZ, Pencel C, Pencel D-125, Pencel D-135, Pencel D-160, Pencel KK (all trade names, rosin ester resins, manufactured by Arakawa Chemical Industries, Ltd.) Can be mentioned.

  Further, as other rosins, for example, Longis R, Longis K-25, Longis K-80, Longis K-18 (all trade names, rosin derivatives, manufactured by Arakawa Chemical Industries, Ltd.) Pine Crystal KR-85, Pine Crystal KR-120, Pine Crystal KR-612, Pine Crystal KR-614, Pine Crystal KE-100, Pine Crystal KE-311, Pine Crystal KE-359, Pine Crystal KE-604, Pine Crystal 30PX, Pine Crystal D- 6011, Pine Crystal D-6154, Pine Crystal D-6240, Pine Crystal KM-1500, Pine Crystal KM-1550 (all trade names, ultra-light rosin derivatives, manufactured by Arakawa Chemical Co., Ltd.), Aradym R-140 Aradai R-95 (all trade names, polymerized rosin, manufactured by Arakawa Chemical Co., Ltd.), HYPER CH (all trade names, hydrogenated rosin, manufactured by Arakawa Chemical Co., Ltd.), beam set 101 (all trade names) , Rosin acrylate, Arakawa Chemical Industries, Ltd.) and the like.

The acid value of the rosin compound is preferably 150 to 400 KOH mg / g, more preferably 200 to 400 KOH mg / g, and particularly preferably 280 to 400 KOH mg / g. When the substrate is a cellulose acylate film, by controlling the acid value of the rosin compound within this range, a very good adhesion effect can be obtained while maintaining the moisture permeability reduction effect of the cured layer.
Examples of the rosin compound having an acid value in the above range include the acid-modified rosin described above. In particular, a rosin compound obtained by adding maleic acid or fumaric acid by Diels-Alder reaction is preferably used in the present invention.
In the present invention, an acid-modified rosin is preferable as the rosin compound, and it is more preferable to use a hydrogenated treatment after acid modification. By performing the hydrogenation treatment, it is possible to prevent the residual double bond of the rosin compound from being oxidized in the low moisture permeable layer and coloring the film.
The softening point of the rosin compound is preferably 100 to 170 ° C. If the softening point of the rosin compound is less than 100 ° C, the cured layer tends to be soft and the blocking property tends to be inferior. If the softening point exceeds 170 ° C, the solubility in the solvent deteriorates and the haze of the cured layer tends to increase. Become.
In the present invention, the softening point of the rosin compound can be measured by the ring and ball method of JIS K-2531.

  The content in the case of containing the rosin compound (B) described above is low moisture permeability because the moisture permeability of the optical film is further reduced, the crosstalk of the image display device is further reduced, and the durability is improved. It is preferable that it is 1 mass%-50 mass% with respect to the total solid of a curable composition for layers, It is more preferable that it is 10 mass%-40 mass%, It is 15 mass%-30 mass% Is more preferable.

[Inorganic fine particles (C) having an average particle size of 30 nm to 100 nm]
Specific examples of the inorganic fine particles (C) having an average particle size of 30 nm or more and 100 nm or less include inorganic oxide fine particles and magnesium fluoride. Among these, silica fine particles are particularly preferable in terms of refractive index, dispersion stability, and cost.
The average particle size (primary particle size) of the inorganic fine particles (C) is preferably from 30 nm to 100 nm, more preferably from 35 nm to 90 nm, and more preferably from 40 nm to 85 nm, from the viewpoint of reducing moisture permeability. Further preferred.

Here, regarding the mechanism by which moisture permeability is reduced by using inorganic fine particles having an average particle diameter of 30 nm or more and 100 nm or less, the inventors consider as follows.
When a water vapor partial pressure difference is made between one surface and the other surface of a film having a low moisture permeable layer, water molecules pass through the low moisture permeable layer as a driving force. When inorganic fine particles are present in the low moisture-permeable layer, water molecules cannot pass through the inorganic fine particles, and it is considered that the moisture permeability reduction effect is generated by limiting the region that can pass through the layer.
On the other hand, the surface of the inorganic fine particles (particularly the surface of the inorganic oxide fine particles such as silica fine particles) is covered with a hydroxyl group, so that water molecules are easily adsorbed and water molecules are likely to be present in the low moisture permeable layer. In a steady state, it is considered that water molecules repeatedly absorb and desorb on the surface of the inorganic fine particles in the low moisture-permeable layer. When the same amount of inorganic fine particles is contained in the low moisture-permeable layer, if the average particle size of the inorganic fine particles is 30 nm or more, the total surface area of the inorganic fine particles does not become too large, and the average distance between the inorganic fine particles is further increased. By being ensured, it is considered that the above moisture permeability reduction effect that water molecules cannot pass through the inorganic fine particles can be sufficiently exhibited.
Further, when the average particle size of the inorganic fine particles is 100 nm or less, it is considered that gaps are hardly generated in the layer such as between the inorganic fine particles and the binder, and an increase in moisture permeability is suppressed.

  The inorganic fine particles may be either crystalline or amorphous, and may be monodispersed particles or aggregated particles as long as a predetermined particle size is satisfied, but is preferably monodispersed. The shape may be an indeterminate shape, or may be a porous particle or a hollow particle. However, since it is preferable that water molecules are less adsorbed, a particle having a spherical diameter and having no cavity inside is most preferable.

Two or more inorganic fine particles having different average particle diameters can be used in combination.
Here, the average particle diameter of the inorganic fine particles can be obtained from a known method such as an electron micrograph or a BET method. In the present invention, the average particle diameter is obtained by the BET method.

<Surface treatment of inorganic fine particles (C)>
The inorganic fine particles (C) are preferably surface-treated by a conventional method, and are preferably surface-treated (surface modified) with a silane coupling agent.
In particular, the surface of the inorganic fine particles is preferably treated with a hydrolyzate of an organosilane compound and / or a partial condensate thereof in order to improve dispersibility in the binder for forming a low moisture permeable layer. In this case, it is more preferable to use either an acid catalyst or a metal chelate compound or both. The method for treating the surface of the inorganic fine particles is described in paragraphs [0046] to [0076] of JP-A-2008-242314. The organosilane compound, the siloxane compound, and the solvent for the surface treatment described in this publication. Surface treatment catalysts, metal chelate compounds, and the like can also be suitably used in the present invention.

  The content in the case of containing the inorganic fine particles (C) mentioned above is low moisture permeability because the moisture permeability of the optical film is further reduced, the crosstalk of the image display device is further reduced, and the durability is better. It is preferable that it is 10 mass%-80 mass% with respect to the total solid of a curable composition for layers, 15 mass%-75 mass% is more preferable, and 20 mass%-70 mass% is still more preferable.

[Other compounds having an unsaturated double bond group (a3)]
In the present invention, the compound (a3) having an unsaturated double bond other than the above-described compound (a1) and compound (a2) in the curable composition for a low moisture-permeable layer is within the range not impairing the effects of the present invention. Can be used together. In addition, it is preferable that the unsaturated double bond group which the said compound (a3) has is an ethylenically unsaturated double bond group like the compound (a1) and the compound (a2) mentioned above.

  The compound (a3) is preferably a (meth) acrylate compound having no cyclic aliphatic hydrocarbon group or fluorene ring. For example, (meth) acrylic acid diesters of alkylene glycol, polyoxyalkylene glycol (Meth) acrylic acid diesters, (meth) acrylic acid diesters of polyhydric alcohols, (meth) acrylic acid diesters of ethylene oxide or propylene oxide adducts, epoxy (meth) acrylates, urethane (meth) acrylates, polyesters (Meth) acrylates and the like can be mentioned.

Among these, esters of polyhydric alcohol and (meth) acrylic acid are preferable.
Specifically, for example, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol (meth) acrylate, ethylene glycol di (meth) acrylate, triethylene glycol Di (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, EO modified trimethylolpropane tri (meth) acrylate, PO modified trimethylolpropane tri (meta) ) Acrylate, EO-modified tri (meth) acrylate phosphate, trimethylolethane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol tetra Meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, polyurethane polyacrylate, polyester polyacrylate and caprolactone-modified tris (acryloyloxyethyl) isocyanurate.

  Commercially available polyfunctional acrylate compounds having a (meth) acryloyl group can be used, and specific examples thereof include NK ester A-TMMT, Nippon Kayaku manufactured by Shin-Nakamura Chemical Co., Ltd. KAYARAD DPHA manufactured by Co., Ltd. can be mentioned. The polyfunctional monomer is described in paragraphs [0114] to [0122] of JP-A-2009-98658, and the same applies to the present invention.

  The compound having an unsaturated double bond group that does not have a cyclic aliphatic hydrocarbon group is a compound having a hydrogen bondable substituent, and adhesion to a substrate film or a patterned optically anisotropic layer From the viewpoint of low curl and the like. The hydrogen-bonding substituent refers to a substituent in which an atom having a large electronegativity such as nitrogen, oxygen, sulfur, or halogen and a hydrogen bond are covalently bonded. Specifically, OH—, SH—, — NH-, CHO-, CHN- and the like can be mentioned, and urethane (meth) acrylates and (meth) acrylates having a hydroxyl group are preferable. Commercially available polyfunctional acrylates having a (meth) acryloyl group can also be used. NK Oligo U4HA manufactured by Shin-Nakamura Chemical Co., Ltd., NK ester A-TMM-3 manufactured by the same company, Nippon Kayaku Co., Ltd. ) KAYARAD PET-30, etc.

  When the compound (a3) is contained, the content is preferably 1% by mass to 30% by mass with respect to the total solid content of the curable composition for a low moisture permeable layer, and 2% by mass to 20% by mass. % Is more preferable, and 3% by mass to 15% by mass is still more preferable.

[Inorganic layered compound]
From the viewpoint of further reducing the moisture permeability of the low moisture permeable layer, the curable composition for the low moisture permeable layer preferably includes dispersing an inorganic layered compound in a binder that can be used for the above-described low moisture permeable layer. Since the inorganic layered compound has a hydrophilic surface, it is preferably subjected to an organic treatment.

An inorganic layered compound is an inorganic compound that has a structure in which unit crystal layers are laminated and swells or cleaves when a solvent is coordinated or absorbed between the layers.
Examples of such inorganic compounds include swellable hydrous silicates such as smectite group clay minerals (montmorillonite, saponite, hectorite, etc.), palm curite group clay minerals, kaolinite group clay minerals, phyllosilicates (mica). Etc.).
In addition, a synthetic inorganic layered compound is also preferably used. Examples of the synthetic inorganic layered compound include synthetic smectite (hectorite, saponite, stevensite, etc.), synthetic mica, etc., preferably smectite, montmorillonite, mica, and montmorillonite. Mica is more preferable.
Examples of the inorganic layered compound that can be used as a commercial product include MEB-3 (synthetic mica aqueous dispersion manufactured by Corp Chemical Co., Ltd.), ME-100 (synthetic mica manufactured by Corp Chemical Co., Ltd.), and S1ME (Coop Chemical Co., Ltd.). ) Synthetic mica), SWN (Synthetic smectite manufactured by Corp Chemical Co., Ltd.), SWF (Synthetic smectite manufactured by Corp Chemical Co., Ltd.), Kunipia F (Purified bentonite manufactured by Kunimine Chemical Industries, Ltd.), Bengel (Hojun Co., Ltd.) Purified bentonite), Bengel HV (refined bentonite manufactured by Hojun Co., Ltd.), Wenger FW (purified bentonite manufactured by Hojun Co., Ltd.), Bengel Bright 11 (purified bentonite manufactured by Hojun Co., Ltd.), Wenger Bright 23 (Hojun Co., Ltd.) Refined bentonite), Wenger Bright 25 (Hoju Ltd. purification bentonite), Wenger A (HOJUN Co. purification bentonite), can be used Wenger 2M (HOJUN Co. purified bentonite) or the like.
Moreover, it is preferable that such an inorganic layered compound is obtained by subjecting these inorganic layered compounds to an organic treatment.

The swellable layered inorganic compound is preferably finely divided from the viewpoint of achieving both low moisture permeability and adhesion between the substrate and the low moisture permeability layer.
The swellable layered inorganic compound subjected to the fine particle treatment is usually plate-shaped or flat-shaped, and the planar shape is not particularly limited, and may be an amorphous shape.
The average particle diameter (planar average particle diameter) of the swellable layered inorganic compound that has been microparticulated is preferably, for example, 0.1 μm to 10 μm, more preferably 0.1 μm to 8 μm, and particularly 0.1 μm to 6 μm. preferable.

(Polymerization initiator)
The curable composition for a low moisture permeability layer preferably contains a polymerization initiator. As the polymerization initiator, a photopolymerization initiator is preferable.
Examples of the photopolymerization initiator include acetophenones, benzoins, benzophenones, phosphine oxides, ketals, anthraquinones, thioxanthones, azo compounds, peroxides, 2,3-dialkyldione compounds, disulfide compounds , Fluoroamine compounds, aromatic sulfoniums, lophine dimers, onium salts, borate salts, active esters, active halogens, inorganic complexes, coumarins and the like.
Specific examples, preferred embodiments, commercially available products and the like of the photopolymerization initiator are described in paragraphs [0133] to [0151] of JP-A-2009-098658, and can be suitably used in the present invention as well. .

  Examples of the photopolymerization initiator include “Latest UV Curing Technology” {Technical Information Association, Inc.} (1991), p. 159, and “UV Curing System” written by Kiyomi Kato (published by the General Technology Center in 1989), p. Various examples are also described in 65-148 and are useful in the present invention.

  Examples of commercially available photocleavable photoradical polymerization initiators include “Irgacure 651”, “Irgacure 184”, “Irgacure 819”, and “Irgacure 907” manufactured by BASF (former Ciba Specialty Chemicals). "Irgacure 1870" (CGI-403 / Irgacure 184 = 7/3 mixed initiator), "Irgacure 500", "Irgacure 369", "Irgacure 1173", "Irgacure 2959", "Irgacure 4265", "Irgacure 4263" , “Irgacure 127”, “OXE01”, etc .; “Kayacure DETX-S”, “Kayacure BP-100”, “Kayacure BDMK”, “Kayacure CTX”, “Kayacure BMS”, “Nippon Kayaku Co., Ltd.” Kayacure 2-EAQ ", “Kayacure ABQ”, “Kayacure CPTX”, “Kayacure EPD”, “Kayacure ITX”, “Kayacure QTX”, “Kayacure BTC”, “Kayacure MCA”, etc .; “Esacure (KIP100F, KB1, EB3, BP, X33, KTO46, KT37, KIP150, TZT) "and the like; and combinations thereof are preferable examples.

  The content of the above-described photopolymerization initiator is set so that the polymerizable compound contained in the curable composition for a low moisture permeable layer is polymerized and the starting point is set not to increase too much. It is preferable that it is 0.5 mass%-8 mass% with respect to the total solid, and it is more preferable that it is 1 mass%-5 mass%.

[Ultraviolet absorber]
The curable composition for a low moisture-permeable layer can contain an ultraviolet absorber.
The optical film of the present invention including a low moisture permeable layer is used for a polarizing plate or a liquid crystal display device member, but contains a UV absorber in the low moisture permeable layer from the viewpoint of preventing deterioration of the polarizing plate or liquid crystal. Thus, ultraviolet absorption can be imparted to the optical film.

〔solvent〕
The curable composition for a low moisture-permeable layer can contain a solvent.
Various solvents can be used as the solvent in consideration of the solubility of the monomer, the drying property during coating, and the like.
Examples of the organic solvent include dibutyl ether, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydrofuran, anisole, phenetole, dimethyl carbonate, carbonic acid. Methyl ethyl, diethyl carbonate, acetone, methyl ethyl ketone (MEK), diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone, ethyl formate, propyl formate, pentyl formate, methyl acetate, ethyl acetate, propyl acetate, Methyl propionate, ethyl propionate, γ-ptyrolactone, methyl 2-methoxyacetate, methyl 2-ethoxyacetate, ethyl 2-ethoxyacetate, ethyl 2-ethoxypropionate, 2-methoxy Ethanol, 2-propoxyethanol, 2-butoxyethanol, 1,2-diacetoxyacetone, acetylacetone, diacetone alcohol, methyl alcohol such as methyl acetoacetate and ethyl acetoacetate, ethyl alcohol, isopropyl alcohol, n-butyl alcohol, cyclohexyl alcohol , Isobutyl acetate, methyl isobutyl ketone (MIBK), 2-octanone, 2-pentanone, 2-hexanone, ethylene glycol ethyl ether, ethylene glycol isopropyl ether, ethylene glycol butyl ether, propylene glycol methyl ether, ethyl carbitol, butyl carbitol, Hexane, heptane, octane, cyclohexane, methylcyclohexane, ethylcyclohexane, benzene, tolue And xylene can be used, and these can be used alone or in combination of two or more.

  Among the above solvents, it is preferable to use at least one of dimethyl carbonate, methyl acetate, ethyl acetate, methyl ethyl ketone, acetylacetone, and acetone, more preferably dimethyl carbonate and methyl acetate, and methyl acetate is used. It is particularly preferred.

  The content of the solvent is preferably such that the solid content concentration of the low moisture-permeable layer curable composition is in the range of 20% by mass to 80% by mass, more preferably 30% by mass to 75% by mass. More preferably, it is 40 mass%-70 mass%.

[Second embodiment]
The low moisture permeable layer has a cyclic polyolefin resin (D) of 50 to 99 mass because the moisture permeability of the optical film is further reduced, the crosstalk of the image display device is further reduced, and the durability is improved. The aspect (2nd aspect) which is a layer containing% is preferable.

[Cyclic polyolefin resin (D)]
The cyclic polyolefin-based resin represents a polymer resin having a cyclic olefin structure.
Examples of cyclic polyolefin resins include (1) norbornene polymers, (2) monocyclic olefin polymers, (3) cyclic conjugated diene polymers, and (4) vinyl alicyclic hydrocarbon polymers. And hydrides of (1) to (4).
Preferred polymers for the present invention are addition (co) polymer cyclic polyolefin-based resins containing at least one repeating unit represented by the following general formula (II) and, if necessary, repeating represented by the general formula (I) An addition (co) polymer cyclic polyolefin-based resin further comprising at least one unit. Further, a ring-opening (co) polymer containing at least one cyclic repeating unit represented by the general formula (III) can also be suitably used.

In formulas (I) to (III), m represents an integer of 0 to 4. R ^{1 to} R ⁶ each independently represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and X ^{1 to} X ³ and Y ^{1 to} Y ³ each independently represent a hydrogen atom or a hydrocarbon having 1 to 10 carbon atoms. group, a halogen atom, a hydrocarbon group having 1 to 10 carbon atoms substituted with a halogen _{atom, - (CH 2) n COOR} 11, - (CH 2) n OCOR 12, - (CH 2) n NCO, - (CH _{2) n NO 2, - (} CH 2) n CN, - (CH 2) n CONR 13 R 14, - (CH 2) n NR 13 R 14, - (CH 2) n OZ, - (CH 2) n W, or (—CO) ₂ O, (—CO) ₂ NR ¹⁵ composed of X ¹ and Y ¹ or X ² and Y ² or X ³ and Y ³ is shown. R ¹¹ , R ¹² , R ¹³ , R ¹⁴ and R ¹⁵ each independently represents a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and Z represents a hydrocarbon group or a hydrocarbon group substituted with halogen. W represents SiR ¹⁶ _p D _3-p (R ¹⁶ represents a hydrocarbon group having 1 to 10 carbon atoms, D represents a halogen atom, —OCOR ¹⁶ or —OR ¹⁶ , and p represents an integer of 0 to 3). , N represents an integer of 0-10.

Norbornene polymer hydrides are disclosed in JP-A-1-240517, JP-A-7-196736, JP-A-60-26024, JP-A-62-19807, JP-A-2003-115767, or As disclosed in JP-A-2004-309979 and the like, it is prepared by hydrogenation after polycyclic unsaturated compounds are subjected to addition polymerization or metathesis ring-opening polymerization. In the norbornene-based polymer used in the present invention, R ^{3 to} R ⁶ are preferably hydrogen atoms or —CH _{3, and} more preferably hydrogen atoms from the viewpoint of low moisture permeability. X ³ and Y ³ are preferably a hydrogen atom, Cl or —COOCH _{3, and} more preferably a hydrogen atom from the viewpoint of low moisture permeability. Other groups are appropriately selected. m is preferably 0 or 1. This norbornene-based resin is sold under the trade name Arton G or Arton F by JSR Corporation, and from Zeon Corporation, Zeonor ZF14, ZF16, Zeonex 250 or Zeonex. They are commercially available under the trade name 280 and can be used.

  Norbornene-based addition (co) polymers are disclosed in JP-A-10-7732, JP-T 2002-504184, U.S. Published Patent No. 200029129157A1, WO2004 / 070463A1, and the like. It is obtained by addition polymerization of norbornene-based polycyclic unsaturated compounds. If necessary, norbornene-based polycyclic unsaturated compounds and ethylene, propylene, butene; conjugated dienes such as butadiene and isoprene; nonconjugated dienes such as ethylidene norbornene; acrylonitrile, acrylic acid, methacrylic acid, maleic anhydride It is also possible to carry out addition polymerization with linear diene compounds such as acid, acrylic acid ester, methacrylic acid ester, maleimide, vinyl acetate and vinyl chloride. Among these, a copolymer with ethylene is preferable. This norbornene-based addition (co) polymer is marketed by Mitsui Chemicals, Inc. under the name of Apel, and has different glass transition temperatures (Tg) such as APL8008T (Tg70 ° C), APL6013T (Tg125 ° C) or APL6015T ( Grades such as Tg145 ° C). Pellets such as TOPAS 8007, 6013, and 6015 are sold by Polyplastics Co., Ltd. Further, Appear 3000 is sold by Ferrania.

In the present invention, the content of the cyclic polyolefin resin (D) in the low moisture-permeable layer is preferably 70% by mass to 99% by mass, and more preferably 80% by mass to 99% by mass.
In the cyclic polyolefin resin (D), the content of the cyclic olefin polymerization unit is preferably 5 to 95% by mass.

  In the present invention, the glass transition temperature (Tg) of the cyclic polyolefin resin (D) is not limited, but a high Tg cyclic polyolefin resin such as 200 ° C. to 400 ° C. can also be used.

Such a low moisture-permeable layer according to the second aspect is preferably a layer formed by curing a curable composition for a low moisture-permeable layer containing a cyclic polyolefin resin (D).
In addition, the curable composition for a low moisture permeable layer may further include another compound (a3) having an unsaturated double bond group, an inorganic layered compound, a polymerization initiator, and an ultraviolet absorber, as in the first embodiment. You may contain an agent, a solvent, etc. In the second embodiment, the compound (a1) and the compound (a2) used in the curable composition for a low moisture permeable layer of the first embodiment may be contained.

[Other aspects]
As another aspect of the said low moisture-permeable layer, the aspect which is a layer containing polyester urethane (E) is mentioned.
Here, “polyester urethane” is a polymer having an ester bond and a urethane bond (—O—CO—NH—) in one molecule.
Moreover, the monomer used for the synthesis | combination of polyester urethane contains a diol, dicarboxylic acid, and a diisocyanate at least. These three types of monomers preferably have a hydroxyl group (—OH), a carboxy group (—COOH), and an isocyanate group (—NCO) at both ends of a hydrocarbon group having an unbranched structure, respectively. Including the structure where
The hydrocarbon group having an unbranched structure is preferably an alkylene group, an alkenylene group, an alkynylene group, an arylene group, or a combination thereof.
The alkylene group, alkenylene group and alkynylene group preferably have a linear structure.
When the hydrocarbon group is an alkylene group, an alkenylene group or an alkynylene group, the number of carbon atoms is preferably 1 to 8, more preferably 2 to 6, and most preferably 2 to 4. .
The arylene group may have an alkyl group having 1 to 8 carbon atoms as a substituent.
The arylene group is preferably a phenylene group or a naphthylene group, more preferably a phenylene group, and most preferably a p-phenylene group.
As the hydrocarbon group, the alkylene group, the arylene group, or a combination thereof is particularly preferable.

As the diol, for example, ethylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol and 1,5-pentanediol are preferable. It is mentioned in.
Preferable examples of the dicarboxylic acid include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, succinic acid, glutaric acid, adipic acid, oxalic acid, and malonic acid.
Examples of the diisocyanate include ethylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, m-xylylene diisocyanate, p-phenylene diisocyanate, tolylene diisocyanate, Preferred examples include p, p′-diphenylmethane diisocyanate and 1,5-naphthylene diisocyanate.

  The number average molecular weight (Mn) of the polyesterurethane (E) is preferably in the range of 2000 to 100,000, and more preferably in the range of 5000 to 50000. The number average molecular weight (Mn) in the present invention is a number average molecular weight in terms of polystyrene measured by GPC.

  Moreover, as a commercial item of polyester urethane (E), Toyobo Co., Ltd. Byron series etc. are mentioned, for example, Byron UR-1510, Byron UR-2300, Byron UR-3200, Byron UR. -3210, Byron UR-3260, Byron UR-6100, Byron UR-8300, Byron UR-8700 and the like can be preferably used.

  Moreover, content of polyester urethane (E) is used in 1-20 mass% with respect to total solid, when the total solid of the curable composition for low moisture-permeable layers is 100 mass%. Preferably, it is 2 to 15% by mass, more preferably 3 to 10% by mass.

[Configuration of low moisture permeable layer]
(Thickness of low moisture permeable layer)
The low moisture permeable layer may be a single layer or a plurality of layers, but the film thickness of the low moisture permeable layer (if multiple layers are provided, the thickness of each layer) is 0.5 μm to 25 μm. It is preferably 1 μm to 20 μm, more preferably 2 μm to 18 μm, and particularly preferably 3 μm to 17 μm.

(Moisture permeability of low moisture permeable layer)
From the gas transmission type of the composite film (e.g., "barrier of Science of the packaging material (packaging Fundamental Course 5)" p68~72 Tsutomu Nakagawa al Japan Packaging Institute), the moisture permeability of the optical film of the steady state J _f, group When the moisture permeability of the material film is J _s and the moisture permeability of the low moisture permeable layer when the optical film is separated into the base film and the low moisture permeable layer is J _b , the following equation is established.
_{1 / J f = 1 / J} s + 1 / J b ····· formula (A)
The moisture permeability J _f of the optical film and the moisture permeability J _s of the base film can be directly measured, and the moisture permeability J _b of the low moisture permeable layer can be obtained by calculation based on those measured values.
In the present invention, it is preferable that the moisture permeability of the low moisture-permeable layer is 5.0~100g / m ² / day, more preferably ^{10~100g / m 2 / day, 15~90g} / m 2 / day Gayori 20 to 80 g / m ² / day is particularly preferable.

(Moisture permeability per unit film thickness of low moisture permeable layer)
It is generally known that the moisture permeability in a steady state is inversely proportional to the film thickness.
Accordingly, the moisture permeability that can be reached by the low moisture permeable layer in the range of the film thickness is determined by the moisture permeability per unit film thickness that is a characteristic value of the material, and the smaller the value, the lower the moisture permeability.
On the other hand, the moisture permeability can be adjusted by adjusting the film thickness of the low moisture permeable layer based on the above relationship. However, if the moisture permeability per unit film thickness is too low, it becomes difficult to control the moisture permeability of the optical film.
In view of both moisture permeability per thickness 10μm of the low moisture-permeable layer is preferably 5.0~100g / m ² / day, more preferably ^{10~100g / m 2 / day, 20~90g} / m 2 / Day is more preferable, and 30 to 80 g / m ² / day is particularly preferable.
The water vapor transmission rate was measured according to the method described in JIS Z 0208: 1976, “Water vapor transmission test method for moisture-proof packaging materials (cup method)”, at a temperature of 40 ° C. and a relative humidity of 90% for 24 hours. It refers to the amount (g / m ² / day).
The moisture permeability per 10 μm of the low moisture permeable layer can be estimated as follows from the moisture permeability of the base film and the optical film and the film thickness of the low moisture permeable layer.

The moisture permeability C _b (10 μm) with respect to the film thickness of 10 μm of the low moisture permeable layer can be expressed by the following formula based on J _b calculated above.
C _b (10 μm) = J _b × d _b / 10 [g / m ² / day] (2)
Here, d _b [μm] is the film thickness of the low moisture-permeable layer, and can be determined from the film thickness difference before and after the lamination of the low moisture-permeable layer as described above.

  The low moisture permeable layer preferably has a moisture permeable hard coat layer function, an antireflection function, an antifouling function, and the like.

[Production method of low moisture-permeable layer]
The method for producing (laminating) the low moisture-permeable layer is not particularly limited. For example, the above-described curable composition for a low moisture-permeable layer is applied on the base film or the patterned optically anisotropic layer, and is cured and laminated. A method etc. are mentioned suitably.

Base film:
[Material of base film]
As a material for forming the base film, a polymer excellent in optical performance transparency, mechanical strength, thermal stability, isotropy and the like is preferable. The term “transparent” as used in the present invention indicates that the visible light transmittance is 60% or more, preferably 80% or more, and particularly preferably 90% or more.
For example, polycarbonate polymers; polyester polymers such as polyethylene terephthalate and polyethylene naphthalate; (meth) acrylic polymers such as polymethyl methacrylate; styrene polymers such as polystyrene and acrylonitrile / styrene copolymer (AS resin); can give.
Polyolefins such as polyethylene and polypropylene; polyolefin polymers such as ethylene / propylene copolymers; vinyl chloride polymers; amide polymers such as nylon and aromatic polyamide; imide polymers; sulfone polymers; Polyether ether ketone polymers; polyphenylene sulfide polymers, vinylidene chloride polymers; vinyl butyral polymers; arylate polymers, polyoxymethylene polymers; epoxy polymers; and polymers obtained by mixing the aforementioned polymers.
The base film can also be formed as a cured layer of an acrylic, urethane, acrylic urethane, epoxy, silicone, or other ultraviolet curable or thermosetting resin.

In addition, as a material for forming the base film, a cellulose polymer (particularly preferably, cellulose acylate) represented by triacetyl cellulose, which has been conventionally used as a transparent protective film for polarizing plates, is preferably used. Can do. As specific embodiments of the cellulose acylate, those described in paragraphs [0027] to [0033] of JP2012-098425A can be appropriately employed.
In recent years, acrylic films that have been proposed for introduction as polarizing plate protective films can also be preferably used. Examples of the acrylic film include acrylic films described in paragraphs [0032] to [0063] of JP 2010-079175, paragraphs [0017] to [0107] of JP 2009-98605 A, and the like. The lactone ring-containing polymer described in 1) can be appropriately employed.

[Characteristics of base film]
(Retardation)
In the substrate film, Re and Rth (defined by the following formulas (I ′) and (II ′)) measured at a wavelength of 590 nm preferably satisfy the formulas (III ′) and (IV ′).
Formula (I ′) Re = (nx−ny) × d
Formula (II ′) Rth = {(nx + ny) / 2−nz} × d
Formula (III ′) | Re | ≦ 50 nm
Formula (IV ′) | Rth | ≦ 300 nm
(In the formulas (I ′) to (IV ′), nx is the refractive index in the slow axis direction in the film plane of the base film, and ny is in the fast axis direction in the film plane of the base film. (It is a refractive index, nz is the refractive index in the film thickness direction of the base film, and d is the thickness (nm) of the base film.)
In the base film, the formulas (III ′) and (IV ′) may be satisfied at at least one point in the film plane, but the formula (III ′) and (IV) in any point in the film plane may be satisfied. It is preferable that (IV ′) is satisfied.
In addition, the in-plane slow axis (Re main axis) is substantially uniform (within in-plane axis deviation within 10 °) even for high retardation (30000> | Re |> 50 nm, 200000> | Rth |> 300 nm) other than the above range. ) Can be used.

  The above Re and Rth are the types of polymer materials used for the base film (if the polymer material used for the base film is a cellulose ester, the degree of substitution of the cellulose ester), the amount of the polymer material and additives It can be adjusted by the addition of a retardation developer, the film thickness, the stretching direction and stretching ratio of the film.

(Base film thickness)
The film thickness of the substrate film is preferably 5 μm to 100 μm, more preferably 10 μm to 80 μm, particularly preferably 15 μm to 70 μm, and particularly preferably 20 μm to 60 μm. By controlling the film thickness within the above range, it is possible to reduce the unevenness of the panel due to the environment where the liquid crystal display device is placed after laminating the low moisture permeable layer, that is, the temperature and humidity change.

(Water vapor permeability of base film)
As described above, the moisture permeability of the base film is in accordance with the method described in “Moisture permeability test method for moisture-proof packaging material (cup method)” of JIS Z 0208: 1976, under the conditions of a temperature of 40 ° C. and a relative humidity of 90%. Measured.
Further, the moisture permeability of the base film is preferably not more than 1200g / m ² / day, more preferably not more than 250g / m ² / day, more preferably at most 200g / m ² / day 150 g / m ² / day or less is particularly preferable.
By controlling the moisture permeability of the base film within the above range, the liquid crystal display device equipped with the optical film (the optical film of the present invention) on which the low moisture permeable layer is mounted is subjected to normal temperature, high humidity and high temperature and high humidity environment over time. , Warpage of the liquid crystal cell and light leakage can be suppressed.

(Moisture permeability per unit film thickness of base film)
As described in the description of (moisture permeability per unit film thickness) of the low moisture permeability layer, the moisture permeability is given to the substrate 10 μm by the following equation.
C _s (10 μm) = J _s × d _s / 10 [g / m ² / day] (where d _s [μm] is the film thickness of the base film, and J _s is the moisture permeability of the base film. is there.)
Moisture permeability is preferably 50~5000g / m ² / day film thickness of the substrate film for 10 [mu] m, more preferably 80~1500g / m ² / day, more preferably 100~1000g / m ² / day, 150~800g / M ² / day is particularly preferred. (The moisture permeability is a value after lapse of 24 hours at 40 ° C. and 90% relative humidity by the method of JIS Z 0208: 1976.)
Further, the moisture permeability C _b (10 μm) / C _s (10 μm) of the base film and the low moisture permeable layer is 10 μm, preferably 1.5 to 30, more preferably 2 to 20. Preferably, it is 3-10.
A sufficient low moisture permeability effect is obtained above the lower limit, and curling can be suppressed below the upper limit.

(Oxygen permeability coefficient of base film)
In order to reduce moisture permeability, it is preferable to suppress the diffusion of water in the film, that is, it is preferable to reduce the free volume of the film. In general, the free volume of the film correlates with the oxygen permeability coefficient of the film.
The oxygen permeability coefficient of the base film is preferably 100 cc · mm / (m ² · day · atm) or less, and more preferably 30 cc · mm / (m ² · day · atm) or less.

(Haze of base film)
The base film preferably has a total haze value of 2.00% or less. When the total haze value is 2.00% or less, the transparency of the film is high, and the contrast ratio and brightness of the liquid crystal display device are improved. The total haze value is more preferably 1.00% or less, further preferably 0.50% or less, particularly preferably 0.30% or less, and most preferably 0.20% or less. The lower the total haze value, the better the optical performance, but it is preferably 0.01% or more considering raw material selection, production control, and roll film handling.
The internal haze value of the substrate film is preferably 1.00% or less. By setting the internal haze value to 1.00% or less, the contrast ratio of the liquid crystal display device can be improved and excellent display characteristics can be realized. The internal haze value is more preferably 0.50% or less, further preferably 0.20% or less, particularly preferably 0.10% or less, and most preferably 0.05% or less. From the viewpoint of raw material selection, production control, etc., 0.01% or more is preferable.
In particular, the base film preferably has a total haze value of 0.30% or less and an internal haze value of 0.10% or less.
The total haze value and internal haze value are the types and addition amounts of film materials, selection of additives (particularly, the particle size, refractive index, addition amount of matting agent particles), and further film production conditions (temperature during stretching, The stretching ratio can be adjusted.
In addition, the measurement of a haze can be measured according to JISK-6714 with a haze meter (HGM-2DP, Suga test machine) at 25 degreeC and 60% of relative humidity for the film sample 40 mm x 80 mm.

(Equilibrium moisture content of base film)
The water content (equilibrium water content) of the base film is 25, regardless of the film thickness, so as not to impair the adhesion with water-soluble thermoplastics such as polyvinyl alcohol when used as a protective film for polarizing plates. It is preferable that the moisture content at 0 degreeC and 80% of relative humidity is 0 mass%-4 mass%. It is more preferably 0% by mass to 2.5% by mass, and further preferably 0% by mass to 1.5% by mass. If the equilibrium moisture content is 4% by mass or less, the dependency of retardation on humidity changes does not become too great, and the liquid crystal display device also has the ability to suppress light leakage after normal temperature, high humidity and high temperature and high humidity environments. preferable.
The moisture content was measured by measuring a film sample of 7 mm × 35 mm by a Karl Fischer method using a moisture meter, a sample drying apparatus “CA-03” and “VA-05” (both manufactured by Mitsubishi Chemical Corporation). It can be calculated by dividing the amount of water (g) by the sample mass (g).

(Dimensional change of base film)
The dimensional stability of the base film is as follows: dimensional change rate after standing for 24 hours under conditions of 60 ° C. and relative humidity 90% (high humidity), and 80 ° C., DRY environment (relative humidity 5% or less) ) When it is allowed to stand for 24 hours under the above conditions (high temperature), it is preferable that the dimensional change rate is 0.5% or less. More preferably, it is 0.3% or less, More preferably, it is 0.15% or less.

[Process for producing base film]
The method for producing the base film includes a step of casting a polymer solution containing a polymer material and a solvent on a support to form a polymer film (the base film), or a method of melting and forming the polymer material. It is preferable to include a step of forming a base film. That is, the base film is preferably formed by casting a polymer solution containing a polymer material and a solvent on a support, or by melting and forming a polymer material. It is more preferable that the resin is melt-formed.

(surface treatment)
The base film may be subjected to a surface treatment in some cases to achieve improved adhesion between the base film and the low moisture permeable layer or other layers (for example, a polarizer, an undercoat layer and a back layer). it can. For example, glow discharge treatment, ultraviolet irradiation treatment, corona treatment, flame treatment, acid or alkali treatment can be used. The glow discharge treatment here may be low-temperature plasma that occurs under a low pressure gas of 10 ^{−3 to} 20 Torr, and plasma treatment under atmospheric pressure is also preferred. A plasma-excitable gas is a gas that is plasma-excited under the above conditions, and examples thereof include chlorofluorocarbons such as argon, helium, neon, krypton, xenon, nitrogen, carbon dioxide, tetrafluoromethane, and mixtures thereof. It is done. Details of these are described in detail in pages 30 to 32 in the Japan Institute of Invention Disclosure Technical Bulletin (Public Technical Number 2001-1745, published on March 15, 2001, Japan Institute of Invention), and are preferably used in the present invention. be able to.

Pattern optical anisotropic layer:
Examples of the method for forming the patterned optically anisotropic layer include the following preferred embodiments, but the present invention is not limited to these, and various known methods can be used.
The first preferred embodiment utilizes a plurality of actions for controlling the alignment of the liquid crystal compound, and then eliminates any action by an external stimulus (heat treatment, etc.) to make the predetermined alignment control action dominant. Is the method. As the above method, for example, the liquid crystalline compound is brought into a predetermined alignment state by the combined action of the alignment control ability by the alignment film and the alignment control ability of the alignment controller added to the liquid crystalline compound, and then fixed. After forming one phase difference region, any action (for example, action by the alignment control agent) disappears by external stimulation (heat treatment, etc.), and the other orientation control action (action by the alignment film) dominates. Thus, another alignment state is realized and fixed to form the other retardation region. Details of this method are described in paragraphs [0017] to [0029] of JP 2012-008170 A, the contents of which are incorporated herein by reference.

  A 2nd suitable aspect is an aspect using a pattern orientation film. In this embodiment, pattern alignment films having different alignment control capabilities are formed, a liquid crystalline compound is disposed thereon, and the liquid crystalline compound is aligned. The liquid crystalline compounds achieve different alignment states depending on the alignment control ability of the pattern alignment film. By fixing each alignment state, the pattern of the 1st and 2nd phase difference area | region is formed according to the pattern of an alignment film. The pattern alignment film can be formed using a printing method, mask rubbing for the rubbing alignment film, mask exposure for the photo alignment film, or the like. A method using a printing method is preferable in that large-scale equipment is not required and manufacturing is easy. Details of this method are described in paragraphs [0166] to [0181] of JP2012-032661, and the contents thereof are incorporated herein by reference.

  As a third preferred embodiment, for example, a photoacid generator is added to the alignment film. In this example, a photoacid generator is added to the alignment film, and pattern exposure exposes a region where the photoacid generator is decomposed to generate an acidic compound and a region where no acid compound is generated. The photoacid generator remains almost undecomposed in the non-irradiated portion, and the interaction between the alignment film material, the liquid crystal compound, and the alignment control agent added as necessary dominates the alignment state, and the liquid crystal compound Is oriented in a direction whose slow axis is perpendicular to the rubbing direction. When the alignment film is irradiated with light and an acidic compound is generated, the interaction is no longer dominant, the rubbing direction of the rubbing alignment film controls the alignment state, and the liquid crystalline compound has its slow axis parallel to the rubbing direction. To parallel orientation. As the photoacid generator used in the alignment film, a water-soluble compound is preferably used. Examples of photoacid generators that can be used include Prog. Polym. Sci. , 23, 1485 (1998). As the photoacid generator, pyridinium salts, iodonium salts and sulfonium salts are particularly preferably used. Details of this method are described in Japanese Patent Application No. 2010-289360, the contents of which are incorporated herein by reference.

The liquid crystalline compound forming such a patterned optically anisotropic layer can be classified into a rod type and a disk type from the shape. In addition, there are low and high molecular types, respectively. Polymer generally refers to a polymer having a degree of polymerization of 100 or more (Polymer Physics / Phase Transition Dynamics, Masao Doi, 2 pages, Iwanami Shoten, 1992). In the present invention, any liquid crystal compound can be used, but a rod-like liquid crystal compound or a discotic liquid crystal compound (discotic liquid crystal compound) is preferably used. Two or more kinds of rod-like liquid crystalline compounds, two or more kinds of disc-like liquid crystalline compounds, or a mixture of a rod-like liquid crystalline compound and a disk-like liquid crystalline compound may be used. In order to fix the liquid crystalline compound, it is more preferable to use a rod-like liquid crystalline compound having a polymerizable group or a discotic liquid crystalline compound, and the liquid crystalline compound has 2 polymerizable groups in one molecule. It is more preferable to have the above. In the case where the liquid crystal compound is a mixture of two or more, it is preferable that at least one liquid crystal compound has two or more polymerizable groups in one molecule.
As the rod-like liquid crystalline compound, for example, those described in claim 1 of JP-T-11-53019 and paragraphs [0026] to [0098] of JP-A-2005-289980 can be preferably used. As the tick liquid crystal compound, for example, those described in paragraphs [0020] to [0067] of JP-A-2007-108732 and paragraphs [0013] to [0108] of JP-A-2010-244038 are preferably used. However, it is not limited to these.

Alignment film:
The optical film of the present invention may form an alignment film for forming an optically anisotropic layer between the patterned optically anisotropic layer and the support.

The alignment film generally contains a polymer as a main component. The polymer material for alignment film is described in many documents, and many commercially available products can be obtained. The polymer material utilized in the present invention is preferably polyvinyl alcohol or polyimide, and derivatives thereof. In particular, modified or unmodified polyvinyl alcohol is preferred. For the alignment film that can be used in the present invention, refer to the modified polyvinyl alcohol described in WO01 / 88574A1, page 43, line 24 to page 49, line 8, and patent No. 3907735, paragraphs [0071] to [0095]. be able to.
The thickness of the alignment film is preferably thin from the viewpoint of oxygen permeability. A certain amount of thickness is required from the viewpoint of forming the optically anisotropic layer. Specifically, the thickness of the alignment film is preferably 0.01 μm to 10 μm, more preferably 0.01 μm to 1 μm, and still more preferably 0.01 μm to 0.5 μm.

  In the present invention, it is also preferable to use a photo-alignment film. Although it does not specifically limit as a photo-alignment film | membrane, The thing as described in Paragraphs [0024]-[0043] of WO2005 / 096041 and the brand name LPP-JP265CP by Rolitechnologies can be used.

Hard coat layer:
It is also preferable to provide a hard coat layer as a functional layer in the optical film of the present invention.
In the present invention, the hard coat layer refers to a layer in which the pencil hardness of the transparent support is increased by forming the layer. Practically, the pencil hardness (JIS K-5400) after laminating the hard coat layer is preferably H or higher, more preferably 2H or higher, and most preferably 3H or higher.
The thickness of the hard coat layer is preferably 0.4 μm to 35 μm, more preferably 1 μm to 30 μm, and most preferably 1.5 μm to 20 μm.
In the present invention, the hard coat layer may be a single layer or a plurality of layers. When there are a plurality of hard coat layers, it is preferable that the total film thickness of all the hard coat layers is in the upper range.
The surface of the hard coat layer of the optical film of the present invention may be flat and uneven. Further, if necessary, the hard coat layer may contain translucent particles for imparting surface irregularities and internal scattering.

[Hard coat layer forming material]
In the present invention, the hard coat layer comprises a composition containing an unsaturated double bond, a polymerization initiator, and, if necessary, translucent particles, a fluorine-containing or silicone compound, and a solvent on a support. It can be formed by coating, drying and curing directly or through another layer. Each component will be described below.

[Compound having an unsaturated double bond]
The composition for forming a hard coat layer can contain a compound having an unsaturated double bond. The compound having an unsaturated double bond can function as a binder, and is preferably a polyfunctional monomer having two or more ethylenically unsaturated groups. The polyfunctional monomer having two or more ethylenically unsaturated groups can function as a curing agent, and the strength and scratch resistance of the coating film can be improved. The number of ethylenically unsaturated groups is more preferably 3 or more. These monomers may be used in combination of a monofunctional or bifunctional monomer and a trifunctional or higher functional monomer.

Examples of the compound having an unsaturated double bond include compounds having an ethylenic functional group such as a (meth) acryloyl group, a vinyl group, a styryl group, and an allyl group. Among them, a (meth) acryloyl group and —C (O ) Compounds having OCH═CH ₂ are preferred. Particularly preferably, a compound containing three or more (meth) acryloyl groups in one molecule described below can be used.

  Specific examples of the compound having an ethylenically unsaturated bond include (meth) acrylic acid diesters of alkylene glycol, (meth) acrylic acid diesters of polyoxyalkylene glycol, (meth) acrylic acid diesters of polyhydric alcohol, Examples include (meth) acrylic acid diesters of adducts of ethylene oxide or propylene oxide, epoxy (meth) acrylates, urethane (meth) acrylates, polyester (meth) acrylates, and the like.

  Among these, esters of polyhydric alcohol and (meth) acrylic acid are preferable. For example, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol (meth) acrylate, ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate , Pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, EO modified trimethylolpropane tri (meth) acrylate, PO modified trimethylolpropane tri (meth) acrylate, EO modified Tri (meth) acrylate phosphate, trimethylolethane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate Rate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,2,3-cyclohexanetetramethacrylate, polyurethane polyacrylate, polyester polyacrylate, caprolactone-modified tris (acryloxyethyl) isocyanurate, etc. Can be mentioned.

  Commercially available polyfunctional acrylate compounds having a (meth) acryloyl group can be used, such as NK ester A-TMMT manufactured by Shin-Nakamura Chemical Co., Ltd., KAYARAD manufactured by Nippon Kayaku Co., Ltd. DPHA etc. can be mentioned. The polyfunctional monomer is described in paragraphs [0114] to [0122] of JP-A-2009-98658, and the same applies to the present invention.

  The compound having an unsaturated double bond is preferably a compound having a hydrogen-bonding substituent from the viewpoints of adhesion to a base film or a low moisture-permeable layer, low curl, and the like. The hydrogen-bonding substituent refers to a substituent in which an atom having a large electronegativity such as nitrogen, oxygen, sulfur, or halogen and a hydrogen bond are covalently bonded. Specifically, OH—, SH—, — NH-, CHO-, CHN- and the like can be mentioned, and urethane (meth) acrylates and (meth) acrylates having a hydroxyl group are preferable. Commercially available polyfunctional acrylates having a (meth) acryloyl group can also be used. NK Oligo U4HA manufactured by Shin-Nakamura Chemical Co., Ltd., NK ester A-TMM-3 manufactured by the same company, Nippon Kayaku Co., Ltd. ) KAYARAD PET-30, etc.

  The content of the compound having an unsaturated double bond in the composition for forming a hard coat layer is sufficient for giving a sufficient polymerization rate and imparting hardness and the like, excluding inorganic components in the composition for forming a hard coat layer. 50 mass% or more is preferable with respect to the total solid content, 60 mass%-99 mass% is more preferable, 70 mass%-99 mass% is still more preferable, and 80 mass%-99 mass% is especially preferable.

In the present invention, it is also preferable to use a compound having a cyclic aliphatic hydrocarbon and an unsaturated double bond group in the molecule for the composition for forming a hard coat layer. By using such a compound, low moisture permeability can be imparted to the hard coat layer. In order to enhance the hard coat property, it is more preferable to use a compound having two or more cyclic aliphatic hydrocarbons and unsaturated double bond groups in the molecule.
When the composition for forming a hard coat layer contains a compound having a cyclic aliphatic hydrocarbon and an unsaturated double bond group in the molecule, the compound having a cyclic aliphatic hydrocarbon and an unsaturated double bond in the molecule is hard. In the compound having an unsaturated double bond in the composition for forming a coat layer, 1% by mass to 90% by mass is preferable, 2% by mass to 80% by mass is more preferable, and 5% by mass to 70% by mass is particularly preferable.

When the composition for forming a hard coat layer contains a compound having a cyclic aliphatic hydrocarbon and an unsaturated double bond group in the molecule, it preferably further contains a (meth) acrylate having 5 or more functional groups.
When the hard coat layer forming composition further contains a pentafunctional or higher (meth) acrylate, the pentafunctional or higher (meth) acrylate is a compound having an unsaturated double bond in the hard coat layer forming composition. Among them, 1% by mass to 70% by mass is preferable, 2% by mass to 60% by mass is more preferable, and 5% by mass to 50% by mass is particularly preferable.

[Translucent particles]
In this invention, an uneven | corrugated shape can also be provided to the hard-coat layer surface by making a hard-coat layer contain translucent particle | grains, or an internal haze can also be provided.

  Translucent particles that can be used in the hard coat layer include polymethyl methacrylate particles (refractive index 1.49), crosslinked poly (acryl-styrene) copolymer particles (refractive index 1.54), melamine resin particles ( Refractive index 1.57), polycarbonate particles (refractive index 1.57), polystyrene particles (refractive index 1.60), cross-linked polystyrene particles (refractive index 1.61), polyvinyl chloride particles (refractive index 1.60), Examples include benzoguanamine-melamine formaldehyde particles (refractive index 1.68), silica particles (refractive index 1.46), alumina particles (refractive index 1.63), zirconia particles, titania particles, particles having hollows and pores, and the like. .

  Of these, crosslinked poly ((meth) acrylate) particles and crosslinked poly (acryl-styrene) particles are preferably used, and the refractive index of the binder is adjusted according to the refractive index of each light-transmitting particle selected from these particles. By adjusting, surface irregularities, surface haze, internal haze, and total haze suitable for the hard coat layer of the optical film of the present invention can be achieved.

The refractive index of the binder (translucent resin) is preferably 1.45 to 1.70, more preferably 1.48 to 1.65.
The difference in refractive index between the translucent particles and the binder of the hard coat layer (“refractive index of the translucent particles” − “refractive index of the hard coat layer excluding the translucent particles”) is 0. If it is less than 05, the refraction angle of the light by the translucent particles becomes small, the scattered light does not spread to a wide angle, there is no deteriorating effect such as depolarization of the transmitted light of the optically anisotropic layer, and the transmittance increases. It is preferable from the viewpoint.

When realizing the difference in refractive index between the particles and the binder, the refractive index of the light-transmitting particles may be adjusted, or the refractive index of the binder may be adjusted.
As a preferable first embodiment, a binder having a tri- or higher functional (meth) acrylate monomer as a main component (a refractive index after curing is 1.50 to 1.53) and an acrylic content of 50 to 100 mass percent is used. It is preferable to use a combination of translucent particles made of poly (meth) acrylate / styrene polymer. By adjusting the composition ratio of the acrylic component having a low refractive index and the styrene component having a high refractive index, it is easy to make the difference in refractive index between the translucent particles and the binder less than 0.05. The ratio of the acrylic component to the styrene component is preferably 50/50 to 100/0, more preferably 60/40 to 100/0, and most preferably 65/35 to 90/10 in terms of mass ratio. The refractive index of the light-transmitting particles comprising the crosslinked poly (meth) acrylate / styrene polymer is preferably 1.49 to 1.55, more preferably 1.50 to 1.54, and most preferably 1. 51 to 1.53.
As a preferred second embodiment, a binder composed of a monomer and inorganic fine particles is obtained by using inorganic fine particles having an average particle size of 1 to 100 nm in combination with a binder mainly composed of a tri- or higher functional (meth) acrylate monomer. The refractive index difference is adjusted to adjust the refractive index difference from the existing light-transmitting particles. Examples of the inorganic particles include oxides of at least one metal selected from silicon, zirconium, titanium, aluminum, indium, zinc, tin, and antimony. Specific examples include SiO ₂ , ZrO ₂ , TiO ₂ , and Al ₂ O. ₃ , In ₂ O ₃ , ZnO, SnO ₂ , Sb ₂ O ₃ , ITO and the like. _Preferably, such _{SiO 2, ZrO 2, Al 2} O 3 and the like. These inorganic particles can be used by mixing in the range of 1% by mass to 90% by mass with respect to the total amount of monomers, and preferably 5% by mass to 65% by mass.
Here, the refractive index of the hard coat layer excluding the translucent particles can be quantitatively evaluated by directly measuring with an Abbe refractometer or by measuring a spectral reflection spectrum or a spectral ellipsometry. The refractive index of the translucent particles is measured by measuring the turbidity by dispersing an equal amount of the translucent particles in the solvent in which the refractive index is changed by changing the mixing ratio of two types of solvents having different refractive indexes. It is measured by measuring the refractive index of the solvent when the turbidity is minimized with an Abbe refractometer.

  The average particle diameter of the translucent particles is preferably 0.3 μm to 12 μm, more preferably 0.5 μm to 8 μm, still more preferably 0.5 μm to 6 μm, and most preferably 1.0 μm to 6 μm. By setting the refractive index difference and the particle size within the above ranges, the light scattering angle distribution does not spread to a wide angle, and it is difficult to cause blurring of characters on the display and a decrease in contrast. It is not necessary to increase the thickness of the layer to be added, and 12 μm or less is preferable because it is difficult to cause problems such as curling and cost increase. Furthermore, it is preferable that the amount falls within the above range from the viewpoint that the coating amount during coating can be suppressed, drying is quick, and surface defects such as drying unevenness are unlikely to occur.

  The measuring method of the average particle diameter of the translucent particles can be any measuring method as long as it is a measuring method for measuring the average particle diameter of the particles, but preferably a transmission electron microscope (magnification of 500,000 to 2,000,000 times) The particles are observed by observing 100 particles, and the average value can be obtained as the average particle diameter.

  The shape of the translucent particles is not particularly limited, but in addition to the spherical particles, translucent particles having different shapes such as irregularly shaped particles (for example, non-spherical particles) may be used in combination. In particular, when the minor axes of non-spherical particles are aligned in the normal direction of the hard coat layer, particles having a smaller particle diameter than the true spherical particles can be used.

  The translucent particles are preferably blended so as to be contained in an amount of 0.1% by mass to 40% by mass in the total solid content of the hard coat layer. More preferably, it is 1-30 mass%, More preferably, it is 1-20 mass%. The internal haze can be controlled within a preferable range by adjusting the blending ratio of the translucent particles within the above range.

Moreover, the application amount of translucent particles is preferably 10 to 2500 mg / m ² , more preferably 30 to 2000 mg / m ² , and still more preferably 100 to 1500 mg / m ² .

<Translucent particle preparation, classification method>
Examples of the method for producing the translucent particles include a suspension polymerization method, an emulsion polymerization method, a soap-free emulsion polymerization method, a dispersion polymerization method, a seed polymerization method, and the like, and any method may be used. These production methods are described in, for example, “Experimental Methods for Polymer Synthesis” (Takayuki Otsu and Masaaki Kinoshita, Chemical Dojinsha), pages 130 and 146 to 147, “Synthetic Polymers”, Vol. 1, p. 246-290, 3rd volume, p. 1 to 108, etc., and Japanese Patent Nos. 2543503, 3508304, 2746275, 3521560, 3580320, and JP-A-10-1561. Reference can be made to methods described in JP-A No. 7-2908, JP-A No. 5-297506, JP-A No. 2002-145919, and the like.

The particle size distribution of the translucent particles is preferably monodisperse particles in terms of haze value and diffusibility control, and uniformity of the coated surface. The CV value representing the uniformity of the particle diameter is preferably 15% or less, more preferably 13% or less, and still more preferably 10% or less. Further, when a particle having a particle size of 20% or more than the average particle size is defined as a coarse particle, the proportion of the coarse particle is preferably 1% or less of the total number of particles, more preferably 0.1% or less. Yes, more preferably 0.01% or less. Particles having such a particle size distribution are also effective means of classification after preparation or synthesis reaction, and particles having a desired distribution can be obtained by increasing the number of classifications or increasing the degree of classification. .
It is preferable to use a method such as an air classification method, a centrifugal classification method, a sedimentation classification method, a filtration classification method, or an electrostatic classification method for classification.

(Photopolymerization initiator)
The hard coat layer forming composition preferably contains a photopolymerization initiator. The photopolymerization initiator described for the low moisture-permeable layer can also be preferably used in the composition for forming a hard coat layer.

  The content of the photopolymerization initiator in the composition for forming the hard coat layer is sufficiently high to polymerize the polymerizable compound contained in the composition for forming the hard coat layer and is small enough not to increase the starting point excessively. From the reason that the amount is set, the amount is preferably 0.5 to 8% by mass, and more preferably 1 to 5% by mass with respect to the total solid content in the composition for forming a hard coat layer.

[Ultraviolet absorber]
The optical film of the present invention is used for a polarizing plate or a liquid crystal display device member, but from the viewpoint of preventing deterioration of the polarizing plate or liquid crystal, the hard coat layer contains an ultraviolet absorber in a range that does not inhibit UV curing. Thus, ultraviolet absorption can be imparted to the optical film.

〔solvent〕
The composition for forming a hard coat layer can contain a solvent. Various solvents can be used as the solvent in consideration of the solubility of the monomer, the dispersibility of the light-transmitting particles, the drying property at the time of coating, and the like.
Examples of the organic solvent include dibutyl ether, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydrofuran, anisole, phenetole, dimethyl carbonate, and methyl carbonate. Ethyl, diethyl carbonate, acetone, methyl ethyl ketone (MEK), diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone, ethyl formate, propyl formate, pentyl formate, methyl acetate, ethyl acetate, propyl acetate, propion Acid methyl, ethyl propionate, γ-ptyrolactone, methyl 2-methoxyacetate, methyl 2-ethoxyacetate, ethyl 2-ethoxyacetate, ethyl 2-ethoxypropionate, 2-methoxy Tanol, 2-propoxyethanol, 2-butoxyethanol, 1,2-diacetoxyacetone, acetylacetone, diacetone alcohol, methyl acetoacetate, methyl acetoacetate and other methyl alcohol, ethyl alcohol, isopropyl alcohol, n-butyl alcohol, cyclohexyl alcohol , Isobutyl acetate, methyl isobutyl ketone (MIBK), 2-octanone, 2-pentanone, 2-hexanone, ethylene glycol ethyl ether, ethylene glycol isopropyl ether, ethylene glycol butyl ether, propylene glycol methyl ether, ethyl carbitol, butyl carbitol, Hexane, heptane, octane, cyclohexane, methylcyclohexane, ethylcyclohexane, benzene, toluene Xylene and the like, and can be used singly or in combination of two or more.

  It is preferable to use a solvent so that the solid content of the composition for forming a hard coat layer is in the range of 20 μm to 80% by mass, more preferably 30 μm to 75% by mass, and still more preferably 40 μm to 70% by mass. It is.

Antireflection layer:
In the optical film of the present invention, it is also one of preferred embodiments that an antireflection layer is laminated on an arbitrary hard coat layer. In the present invention, a known antireflection layer can be preferably used. Among them, a UV curable antireflection layer is preferable.
The antireflection layer may be a single-layer low-reflectance layer having a film thickness of λ / 4 or a multi-layer structure, but a single-layer low-reflectance layer having a film thickness of λ / 4 is particularly preferable. The low refractive material that can be preferably used in the present invention will be described below, but the present invention is not limited thereto.

[Material for low refractive index layer]
The material for the low refractive index layer will be described below.

[Inorganic fine particles]
From the viewpoint of lowering the refractive index and improving the scratch resistance, it is preferable to use inorganic fine particles in the low refractive index layer. The inorganic fine particles are not particularly limited as long as the average particle size is 5 nm to 120 nm, but inorganic low refractive index particles are preferable from the viewpoint of lowering the refractive index.

  Examples of the inorganic fine particles include magnesium fluoride and silica fine particles because of their low refractive index. In particular, silica fine particles are preferable in terms of refractive index, dispersion stability, and cost. The size (primary particle size) of these inorganic particles is preferably 5 nm to 120 nm, more preferably 10 nm to 100 nm, 20 nm to 100 nm, and most preferably 30 nm to 90 nm.

  If the particle size of the inorganic fine particles is 5 nm or more, the effect of improving the scratch resistance is sufficient, and if it is 120 nm or less, the appearance such as black tightening and the integrated reflectance are good. The inorganic fine particles may be either crystalline or amorphous, and may be monodispersed particles or aggregated particles as long as a predetermined particle size is satisfied. The shape is most preferably a spherical diameter, but may be indefinite.

The coating amount of the inorganic fine particles is preferably ^{1mg / m 2 ~100mg / m 2} , more preferably ^{5mg / m 2 ~80mg / m 2} , more preferably from ^{10mg / m 2 ~60mg / m 2} . When the coating amount is 1 mg / m ² or more, a sufficiently low refractive index is ensured and an effect of improving the scratch resistance is exhibited. When the coating amount is 100 mg / m ² or less, black tightening, etc. Appearance and integrated reflectance are improved.

(Porous or hollow fine particles)
In order to reduce the refractive index, it is preferable to use fine particles having a porous or hollow structure. It is particularly preferable to use hollow structure silica particles. The porosity of these particles is preferably 10 to 80%, more preferably 20 to 60%, and most preferably 30 to 60%. It is preferable that the void ratio of the hollow fine particles be in the above range from the viewpoint of lowering the refractive index and maintaining the durability of the particles.

  When the porous or hollow particles are silica, the fine particles preferably have a refractive index of 1.10 to 1.40, more preferably 1.15 to 1.35, and most preferably 1.15 to 1.30. is there. The refractive index here represents the refractive index of the entire particle, and does not represent the refractive index of only the outer shell silica forming the silica particles.

  Further, two or more kinds of hollow silica having different particle average particle sizes can be used in combination. Here, the average particle diameter of the hollow silica can be determined from an electron micrograph.

The specific surface area of the hollow silica in the present invention is preferably from 20 to 300 m ² / g, more preferably 30~120m ² / g, most preferably 40~90m ² / g. The surface area can be determined by the BET method using nitrogen.

  In the present invention, silica particles having no voids can be used in combination with hollow silica. The preferred particle size of silica without voids is 30 nm to 150 nm, more preferably 35 nm to 100 nm, and most preferably 40 nm to 80 nm.

[Inorganic fine particle surface treatment method]
Further, in the present invention, inorganic fine particles can be used after being surface-treated with a silane coupling agent or the like by a conventional method.
In particular, in order to improve the dispersibility in the binder for forming a low refractive index layer, the surface of the inorganic fine particles is preferably treated with a hydrolyzate of an organosilane compound and / or a partial condensate thereof. In this case, it is more preferable to use either an acid catalyst or a metal chelate compound or both. The method for treating the surface of the inorganic fine particles is described in paragraphs [0046] to [0076] of JP-A-2008-242314. The organosilane compound, the siloxane compound, and the solvent for the surface treatment described in this publication. Surface treatment catalysts, metal chelate compounds, and the like can also be suitably used in the present invention.

A fluorine-containing or non-fluorinated monomer having a polymerizable unsaturated group can be used for the low refractive index layer. As the non-fluorinated monomer, it is preferable to use a compound having an unsaturated double bond described as being usable in the hard coat layer. As the fluorine-containing monomer, it is preferable to use a fluorine-containing polyfunctional monomer represented by the following general formula (1), containing 35% by mass or more of fluorine, and having a calculated value of all cross-linking molecular weights smaller than 500.
General formula (1): Rf ₂ {-(L) _m —Y} _n (In general formula (1), Rf ₂ represents an n-valent group containing at least a carbon atom and a fluorine atom, and n is an integer of 3 or more. L represents a single bond or a divalent linking group, m represents 0 or 1, and Y represents a polymerizable unsaturated group.)
Rf ₂ may contain at least one of an oxygen atom and a hydrogen atom. Rf ₂ is linear (linear or branched) or cyclic.

Y is preferably a group containing two carbon atoms forming an unsaturated bond, more preferably a radical polymerizable group, a (meth) acryloyl group, an allyl group, an α-fluoroacryloyl group, and Those selected from —C (O) OCH═CH ₂ are particularly preferred. Among these, from the viewpoint of polymerizability, (meth) acryloyl group, allyl group, α-fluoroacryloyl group, and —C (O) OCH═CH ₂ having radical polymerizability are more preferable.

L represents a divalent linking group, specifically, an alkylene group having 1 to 10 carbon atoms, an arylene group having 6 to 10 carbon atoms, -O-, -S-, -N (R)-, 1 to carbon atoms. A group obtained by combining 10 alkylene group and —O—, —S— or N (R) —, a combination of an arylene group having 6 to 10 carbon atoms and —O—, —S— or N (R) —. Represents the resulting group. R represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. When L represents an alkylene group or an arylene group, the alkylene group and the arylene group represented by L are preferably substituted with a halogen atom, and preferably substituted with a fluorine atom.
Specific examples of the compound represented by the general formula (1) are described in paragraphs [0121] to [0163] of JP 2010-152111 A.

Adhesive layer:
The optical film of the present invention has an adhesive layer between a base film, a patterned optically anisotropic layer, and an optional hard coat layer adjacent to the low moisture permeable layer and the low moisture permeable layer. Is preferred.
As an adhesive constituting such an adhesive layer, for example, a polyvinyl alcohol-based adhesive can be suitably used, and as other adhesives, (meth) acrylic, urethane-based, acrylurethane-based, epoxy-based, A silicone-based thermosetting resin or an ultraviolet curable resin can be used.
The adhesive layer made of such an adhesive can be formed as an aqueous solution coating / drying layer, etc. In preparing the aqueous solution, a crosslinking agent, other additives, and a catalyst such as an acid are also blended as necessary. be able to.

  Hereinafter, various members used for the polarizing plate of the present invention will be described in detail.

Polarizer:
In the present invention, a general linear polarizer can be used as the polarizer. The polarizer may be a stretched film or a layer formed by coating. Examples of the former include a film obtained by dyeing a stretched film of polyvinyl alcohol with iodine or a dichroic dye. Examples of the latter include a layer in which a composition containing a dichroic liquid crystalline dye is applied and fixed in a predetermined alignment state.

In the stereoscopic image display system, an image is recognized through a polarizing plate in order to make a viewer recognize a stereoscopic image called 3D video. One aspect of the polarizing plate is polarized glasses. In an aspect in which right-polarized and left-eye circularly polarized images are formed by the phase difference plate, circularly polarized glasses are used, and in an aspect in which a linearly polarized image is formed, linear glasses are used. The right-eye image light emitted from one of the first and second retardation regions of the optically anisotropic layer is transmitted through the right glasses and shielded by the left glasses, and the first and second retardation regions. It is preferable that the image light for the left eye emitted from the other of the two is transmitted through the left spectacles and shielded by the right spectacles.
Polarized glasses form polarized glasses by including a phase difference functional layer and a linear polarizer. In addition, you may use the other member which has a function equivalent to a linear polarizer.

A specific configuration of the polarizing plate of the present invention including the polarizing glasses will be described.
First, the phase difference plate is formed on a plurality of first lines and a plurality of second lines that are alternately repeated on the video display panel (for example, on odd-numbered lines and even-numbered lines in the horizontal direction if the lines are in the horizontal direction). The first phase difference region and the second phase difference region having different polarization conversion functions are provided on the odd-numbered line and the even-numbered line in the vertical direction if the line is in the vertical direction. When circularly polarized light is used for display, the phase difference between the first phase difference region and the second phase difference region is preferably λ / 4, and the first phase difference region and the second phase difference region are slow. More preferably, the phase axes are orthogonal.

When using circularly polarized light, the phase difference values of the first phase difference region and the second phase difference region are both set to λ / 4, the right eye image is displayed on the odd lines of the video display panel, and the odd line phase difference regions are displayed. If the slow axis is in the direction of 45 degrees, it is preferable to arrange λ / 4 plates on both the right and left glasses of the polarized glasses, and the slow axis of the λ / 4 plate of the right glasses of the polarized glasses is specific. It may be fixed at approximately 45 degrees. In the above situation, similarly, the left eye image is displayed on the even line of the video display panel, and if the slow axis of the even line phase difference region is in the direction of 135 degrees, the left eyeglass of the polarizing glasses Specifically, the slow axis may be fixed at approximately 135 degrees.
Furthermore, from the viewpoint of once emitting image light as circularly polarized light on the patterning retardation film and returning the polarization state to the original state by the polarized glasses, the angle of the slow axis fixed by the right glasses in the above example is exactly The closer to 45 degrees in the horizontal direction, the better. Further, it is preferable that the angle of the slow axis fixed by the left eyeglass is closer to the horizontal 135 degrees (or -45 degrees).

Also, for example, when the video display panel is a liquid crystal display panel, the absorption axis direction of the front side polarizing plate of the liquid crystal display panel is usually the horizontal direction, and the absorption axis of the linear polarizer of the polarizing glasses is the front side polarizing plate. The direction perpendicular to the absorption axis direction is preferably, and the absorption axis of the linear polarizer of the polarizing glasses is more preferably in the vertical direction.
Also, the absorption axis direction of the front-side polarizing plate of the liquid crystal display panel and the slow axes of the odd-numbered phase retardation region and even-numbered phase retardation region of the patterning retardation film form 45 degrees in terms of polarization conversion efficiency. Is preferred.
In addition, about preferable arrangement | positioning of such polarized glasses, a patterning phase difference film, and a liquid crystal display device is disclosed by Unexamined-Japanese-Patent No. 2004-170693, for example.

  Examples of polarized glasses include those described in Japanese Patent Application Laid-Open No. 2004-170693, and commercially available products include accessories from Zalman, ZM-M220W, and accessories from LG 55LW5700.

  Hereinafter, various members used in the image display device of the present invention will be described in detail.

Adhesive layer:
An adhesive layer may be disposed between the optically anisotropic layer and the polarizer. As the pressure-sensitive adhesive layer used for laminating the optically anisotropic layer and the polarizer, for example, the ratio of the storage elastic modulus G ′ and the loss elastic modulus G ″ measured with a dynamic viscoelasticity measuring apparatus (tan δ = G ″ / G ′) represents a material having a ratio of 0.001 to 1.5, and includes a so-called pressure-sensitive adhesive, a substance that easily creeps, and the like. As an adhesive which can be used for this invention, although an acrylic adhesive is mentioned, for example, it is not limited to this.

LCD cell:
The liquid crystal cell used in the image display device of the present invention is preferably VA mode, OCB mode, IPS mode, or TN mode, but is not limited thereto.
In a TN mode liquid crystal cell, rod-like liquid crystal molecules are substantially horizontally aligned when no voltage is applied, and are twisted and aligned at 60 to 120 °. The TN mode liquid crystal cell is most frequently used as a color TFT liquid crystal display device, and is described in many documents.
In a VA mode liquid crystal cell, rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied. The VA mode liquid crystal cell includes (1) a narrowly defined VA mode liquid crystal cell in which rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied, and substantially horizontally when a voltage is applied (Japanese Patent Laid-Open No. Hei 2-). 176625) (2) Liquid crystal cell (SID97, Digest of tech. Papers (Preliminary Proceed) 28 (1997) 845 in which the VA mode is converted into a multi-domain (MVA mode) for widening the viewing angle. ), (3) A liquid crystal cell in a mode (n-ASM mode) in which rod-like liquid crystalline molecules are substantially vertically aligned when no voltage is applied and twisted multi-domain alignment is applied when a voltage is applied (Preliminary collections 58-59 of the Japan Liquid Crystal Society) (1998)) and (4) SURVIVAL mode liquid crystal cells (announced at LCD International 98). Moreover, any of a PVA (Patterned Vertical Alignment) type, an optical alignment type (Optical Alignment), and a PSA (Polymer-Sustained Alignment) may be used. Details of these modes are described in JP-A-2006-215326 and JP-T-2008-538819.
In an IPS mode liquid crystal cell, rod-like liquid crystal molecules are aligned substantially parallel to the substrate, and the liquid crystal molecules respond in a planar manner when an electric field parallel to the substrate surface is applied. The IPS mode displays black when no electric field is applied, and the absorption axes of the pair of upper and lower polarizing plates are orthogonal. JP-A-10-54982, JP-A-11-202323, and JP-A-9-292522 are methods for reducing leakage light at the time of black display in an oblique direction and improving a viewing angle using an optical compensation sheet. No. 11-133408, No. 11-305217, No. 10-307291, and the like.

  Hereinafter, the present invention will be described in more detail based on examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the following examples.

<Curable Composition A for Low Moisture Permeability Layer (Prescription A)>
A curable composition A for a low moisture permeable layer having the following composition used in Formulation A was prepared.

(Composition of curable composition A for low moisture permeable layer)
A-DCP 97.0g
Irgacure 907 (100%) 3.0g
SP-13 0.04g
MEK (methyl ethyl ketone) 40.9g
Methyl acetate 40.9g
Solid content concentration of the curable composition A for low moisture-permeable layers was 55 mass%.

The materials used are shown below.
A-DCP: Tricyclodecane dimethanol diacrylate [manufactured by Shin-Nakamura Chemical Co., Ltd.]
・ Irgacure 907: Polymerization initiator [manufactured by BASF]
SP-13 (leveling agent):

<Curable Composition B for Low Moisture Permeability Layer (Prescription B)>
(Production of purified rosin R)
A sealable reaction vessel equipped with a stirrer, a reflux condenser, and a nitrogen introduction tube was charged with 3000 g of unpurified Chinese gum rosin (acid number 171; softening point 74 ° C., color 6G) under reduced pressure of 400 Pa under nitrogen purge. The main fraction (yield: 86.3%) of the color tone Gardner 2 was obtained as a purified gum rosin R. The resin acid value is a value measured according to the method described in JIS K-5601. The softening point is a value measured by the ring and ball method of JIS K-2531.

(Production of unsaturated acid-modified rosin A)
In a reaction vessel equipped with a stirrer, a reflux condenser with a water separator and a thermometer, 1000 parts by mass of the purified gum rosin R prepared above was charged, and the mixture was heated to 180 ° C. and stirred while stirring in a nitrogen atmosphere. did. Next, 267 parts by mass of fumaric acid was charged, and the temperature was raised to 230 ° C. with stirring and kept for 1 hour, followed by cooling to obtain a solid resin of unsaturated acid-modified rosin A. The resin acid value was 342.0, and the softening point was 125 ° C.

  Next, a curable composition B for a low moisture permeable layer having the following composition used in Formulation B was prepared.

(Composition of curable composition B for low moisture permeable layer)
A-DCP (100%) 77.0 g
Unsaturated acid-modified rosin A (acid value 342) 20.0 g
Irgacure 907 (100%) 3.0g
SP-13 0.04g
MEK (methyl ethyl ketone) 40.9g
Methyl acetate 40.9g
Solid content concentration of the curable composition B for low moisture-permeable layers was 55 mass%.

<Curable composition C for low moisture permeable layer (Formulation C)>
(Preparation of reactive silica fine particles A)
An IPA (isopropyl alcohol) solution (IPA-ST-ZL, manufactured by Nissan Chemical Industries, Ltd.) containing 30% by mass of colloidal silica having an average particle size of 80 nm in solid content is changed from IPA to MEK (methyl ethyl ketone) using a rotary evaporator. Solvent replacement was performed to obtain a MEK dispersion having 30% by mass of silica particles.
By adding 5 parts by mass of 3-methacryloxypropylmethyldimethoxysilane to 100 parts by mass of this MEK dispersion and subjecting it to a heat treatment at 50 ° C. for 1 hour, the solid content of the surface-treated reactive silica fine particles having an average particle diameter of 80 nm is obtained. A 30 mass% MEK dispersion was obtained. (The particle size was measured using the BET method.) Using a rotary evaporator, the obtained 30% by mass solution was concentrated to obtain a 40% by mass solid content MEK dispersion.

  Next, a curable composition C for a low moisture permeable layer having the following composition used in Formulation C was prepared.

(Composition of curable composition C for low moisture permeable layer)
A-DCP 37.96g
Unsaturated acid-modified rosin A 10.00 g
Reactive silica fine particles A (solid content 40%) 120.00 g
Irgacure 907 2.00g
SP-13 0.04g
MEK (methyl ethyl ketone) 6.82 g
Solid content concentration of the curable composition C for low moisture-permeable layers was 55 mass%.

<Curable Composition D for Low Moisture Permeability Layer (Prescription D)>
A curable composition D for a low moisture-permeable layer having the following composition used in Formulation D was prepared.

(Composition of curable composition D for low moisture permeable layer)
Cyclic polyolefin resin (Zeonor 1020R, manufactured by Nippon Zeon)
15.00g
76.50 g of cyclohexane
Cyclohexanone 8.50g
Solid content concentration of the curable composition D for low moisture-permeable layers was 15 mass%.

<Preparation of coating solution 1 for antiglare hard coat layer>
Each component was mixed with a mixed solvent (89 to 11 (mass ratio)) of MIBK (methyl isobutyl ketone) and MEK (methyl ethyl ketone) so as to have the following composition. It filtered with the polypropylene filter with a hole diameter of 30 micrometers, and prepared the coating liquid 1 for anti-glare hard-coat layers. The solid concentration of each coating solution is 40% by mass. The resin particles and smectite were added in a dispersed state.

(Composition of antiglare hard coat layer coating solution 1)
Smectite (Lucentite STN, manufactured by Corp Chemical)
1.00g
Cross-linked acrylic-styrene particles (average particle size 2.5 μm, refractive index 1.52) 8.00 g
Acrylate monomer (NK ester A9550, manufactured by Shin-Nakamura Chemical Co., Ltd.)
87.85g
Polymerization initiator (Irgacure 907, manufactured by BASF) 3.00 g
Leveling agent (P-4) 0.15 g
MIBK (methyl isobutyl ketone) 133.50 g
MEK (methyl ethyl ketone) 16.50 g

[Example 1]

<Preparation of optical film 1>
(Base film (TAC))
Fujitac TD60 (manufactured by FUJIFILM Corporation, width 1,340 mm, thickness 60 μm, Re = 2 nm, Rth = 40 nm) was used as the base film.

(Coating of low moisture permeable layer)
Fujitac TD60 (produced by Fuji Film Co., Ltd., width 1,340 mm, thickness 60 μm, Re = 2 nm, Rth = 40 nm) was unwound in a roll form, and the composition A for forming a low moisture permeable layer was used. The die coating method using the slot die described in Example 1 of Kaikai 2006-122889 was applied under conditions of a conveyance speed of 30 m / min and dried at 60 ° C. for 150 seconds. Thereafter, using an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) with an oxygen concentration of about 0.1% under a nitrogen purge, ultraviolet rays having an illuminance of 400 mW / cm ² and an irradiation amount of 120 mJ / cm ² are used. After irradiation and curing the coating layer to form a low moisture permeable layer, it was wound up to produce a substrate film with a low moisture permeable layer. The coating amount was adjusted so that the film thickness of the low moisture permeable layer was 10 μm.

(Coating of antiglare hard coat layer)
The produced base film with a low moisture-permeable layer is unwound in a roll form, and the coating solution 1 for anti-glare hard coat layer is used, and the anti-glare property is formed on the low moisture-permeable layer so as to have a film thickness of 4 μm. A hard coat layer was applied.
Specifically, in the die coating method using the slot die described in Example 1 of Japanese Patent Application Laid-Open No. 2006-122889, each coating solution was applied at a conveyance speed of 30 m / min, and dried at 80 ° C. for 150 seconds. After that, under an atmosphere of nitrogen purge, an ultraviolet ray having an illuminance of 400 mW / cm ² and an irradiation amount of 180 mJ / cm ² was irradiated using an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) having an oxygen concentration of about 0.1%. The coating layer was cured to form an antiglare hard coat layer, and then wound up to produce a base film with an antiglare hard coat layer and a low moisture permeable layer.

(Preparation of alkali-saponified base film)
The produced antiglare hard coat layer and the substrate film with a low moisture permeable layer are passed through a dielectric heating roll having a temperature of 60 ° C., and the film surface temperature is raised to 40 ° C. An alkaline solution having the following composition is continuously applied to the surface opposite to the surface on which the coat layer is formed with a # 6 wire bar, heated to 110 ° C., and a steam type manufactured by Noritake Company Limited. It was conveyed for 10 seconds under the far infrared heater. Subsequently, 3 ml / m ^{2 of} pure water was applied using the same bar coater. Subsequently, washing with a fountain coater and draining with an air knife were repeated three times, and then the substrate was transported to a drying zone at 70 ° C. for 10 seconds and dried to prepare an alkali saponified base film.
──────────────────────────────────
Composition of alkaline solution ──────────────────────────────────
Potassium hydroxide 2.0 parts by weight Water 6.5 parts by weight Isopropanol 85.0 parts by weight Surfactant SF-1: C ₁₄ H ₂₉ O (CH ₂ CH ₂ O) ₂₀ H 0.035 parts by weight Propylene glycol 6. 5 parts by mass──────────────────────────────────

(Preparation of substrate film with alignment film before exposure)
An alignment film coating solution 1 having the following composition was continuously applied with a wire bar to the saponified surface of the thus prepared alkali saponified base film. The substrate was dried with warm air of 60 ° C. for 60 seconds and further with warm air of 100 ° C. for 120 seconds to form a base film with an alignment film before exposure. The wire bar was adjusted so that the pre-exposure alignment film had a thickness of 0.45 μm.
──────────────────────────────────
Composition of coating liquid 1 for alignment film formation ──────────────────────────────────
Polymer material for alignment film (P-1) 2.4 parts by mass photoacid generator (S-1) 0.17 parts by mass radical polymerization initiator (Irgacure 2959, manufactured by Ciba Specialty Chemicals)
0.18 parts by weight Methanol 16.5 parts by weight IPA (isopropanol) 7.2 parts by weight water 73.55 parts by weight ──────────────────────── ──────────

(UV exposure)
Next, a stripe mask having a lateral stripe width of 363 μm in the transmission portion and a lateral stripe width of 363 μm in the shielding portion is disposed on the above-prepared substrate film with an alignment film before exposure, and a wavelength region of 200 nm to 400 nm in air at room temperature. A pattern alignment film is formed by irradiating ultraviolet rays for 0.06 seconds (30 mJ / cm ² ) using a UV light irradiation device (Light Hammer 10, 240 W / cm, manufactured by Fusion UV Systems) with a illuminance of 500 mW / cm ^{2 as} a light source unit. did.

(Formation of patterned optical anisotropic layer)
The pattern alignment film after the ultraviolet exposure was rubbed once in one direction at 500 rpm while maintaining an angle of 45 ° with respect to the stripe of the stripe mask. Subsequently, the following coating liquid for optically anisotropic layers was applied with a wire bar. Furthermore, after aging for 2 minutes at a film surface temperature of 110 ° C., the sample was cooled to 80 ° C. and irradiated with ultraviolet rays for 20 seconds using an air-cooled metal halide lamp (made by Eye Graphics Co., Ltd.) of 20 mW / cm ² under air. A patterned optically anisotropic layer was formed by fixing the orientation state. In the mask exposure portion (first retardation region), the discotic liquid crystal compound is vertically aligned with the slow axis direction parallel to the rubbing direction, and the unexposed portion (second retardation region) is vertically aligned perpendicularly. It was. The wire bar was adjusted so that the thickness of the optically anisotropic layer was 1.2 μm.

─────────────────────────────────
Composition of coating solution for optically anisotropic layer ─────────────────────────────────
Discotic liquid crystal E-2 100 parts by mass alignment film interface alignment agent (II-1) 1.0 part by mass air interface alignment agent (P-2) 0.4 part by mass photopolymerization initiator 3.0 parts by mass (Irgacure 907 , Manufactured by Ciba Specialty Chemicals Co., Ltd.)
Sensitizer (Kayacure-DETX, manufactured by Nippon Kayaku Co., Ltd.) 1.0 part by weight Methyl ethyl ketone 400 parts by weight ───────────────────────── ────────

<Preparation of optical film 1>
As described above, a low moisture-permeable layer and an antiglare hard coat layer are formed on the surface of the base film (TAC), and a patterned optical anisotropic layer is formed on the back surface. Optical film 1 (Configuration A) was produced. In Table 1 below, the formation method of the patterned optically anisotropic layer (FPR) in Example 1 is referred to as “Method A”.

<Preparation of Polarizing Plate 1>
1) Saponification of Film Commercially available cellulose acylate film (Fujitack ZRD40, manufactured by Fuji Film Co., Ltd.), commercially available cellulose acylate film TD60 (manufactured by Fuji Film Co., Ltd.) and optical film 1 were maintained at 55 ° C. After immersing in a 5 mol / L NaOH aqueous solution (saponification solution) for 2 minutes, the film was washed with water, and then immersed in a 0.05 mol / L sulfuric acid aqueous solution at 25 ° C. for 30 seconds, and then the water was washed in a flushing bath for 30 seconds. The film was neutralized by passing down. Then, draining with an air knife was repeated three times, and after dropping the water, the film was retained in a drying zone at 70 ° C. for 15 seconds and dried to produce a saponified film.

2) Production of Polarizer According to Example 1 of Japanese Patent Application Laid-Open No. 2001-141926, iodine was adsorbed to a stretched polyvinyl alcohol film to produce a polarizer having a thickness of 20 μm.

3) Bonding (Preparation of front-side polarizing plate)
The cellulose acylate film ZRD40 after saponification, the polarizer prepared above, and the cellulose acylate film ZRD40 after saponification were bonded together in this order with a PVA adhesive and heat-dried. At this time, the saponified surface of the cellulose acylate film was set to the polarizer side. Furthermore, the polarizer which bonded the pattern optical anisotropic layer side of the optical film 1 and the cellulose acylate film was bonded together with the acrylic adhesive, and the front side polarizing plate was produced.
Under the present circumstances, it arrange | positioned so that the longitudinal direction of the roll of the produced polarizer and the longitudinal direction of the optical film 1 may become parallel. Moreover, it arrange | positioned so that the longitudinal direction of the roll of a polarizer and the longitudinal direction of the roll of the said cellulose acylate film ZRD40 may become parallel.

(Preparation of rear-side polarizing plate)
The cellulose acylate film TD60 after saponification, the stretched iodine-based PVA polarizer, and the cellulose acylate film ZRD40 after saponification were bonded in this order with a PVA-based adhesive and heat-dried to obtain a rear-side polarizing plate. .
Under the present circumstances, it arrange | positioned so that the longitudinal direction of the roll of the produced polarizer and the longitudinal direction of the cellulose acylate film TD60 may become parallel. Moreover, it arrange | positioned so that the longitudinal direction of the roll of a polarizer and the longitudinal direction of the roll of the said cellulose acylate film ZRD40 may become parallel.

<Production of liquid crystal display device 1>
The upper and lower polarizing plates of the IPS mode liquid crystal cell (LGS 42LS5600) are peeled off, the polarizing plate described above as the front side polarizing plate on the front side, the polarizing plate described above as the rear side polarizing plate on the rear side, and the cellulose acylate film. One sheet was attached to each of the front side and the rear side via an adhesive so that the ZRD 40 was on the liquid crystal cell side. The crossed Nicols were arranged so that the absorption axis of the front-side polarizing plate was in the longitudinal direction (left-right direction) and the transmission axis of the rear-side polarizing plate was in the longitudinal direction (left-right direction). The thickness of the glass used for the liquid crystal cell was 0.5 mm. The obtained liquid crystal display device was designated as a liquid crystal display device 1.

[Example 2]
The optical film 2 (Configuration A) and the polarizing plate 2 were produced in the same manner as in Example 1 except that the low moisture-permeable layer forming composition B was used instead of the low moisture-permeable layer forming composition A. (FPR external bonding type) and the liquid crystal display device 2 were produced.

[Example 3]
The optical film 3 (Configuration A) and the polarizing plate 3 were produced in the same manner as in Example 1 except that the low moisture-permeable layer forming composition C was used instead of the low moisture-permeable layer forming composition A. (FPR external pasting type) and the liquid crystal display device 3 were produced.

[Example 4]
The optical film 4 (Configuration A) and the polarizing plate 4 were produced in the same manner as in Example 1 except that the low moisture-permeable layer forming composition D was used instead of the low moisture-permeable layer forming composition A. (FPR external pasting type) and the liquid crystal display device 4 were produced.

[Example 5]
In the same manner as in Example 1, except that the low moisture-permeable layer forming composition C was used in place of the low moisture-permeable layer forming composition A, and the thickness of the low moisture-permeable layer was changed to 15 μm, A film 5 (Configuration A), a polarizing plate 5 (FPR external pasting type), and a liquid crystal display device 5 were produced.

[Example 6]
By the same method as in Example 3, except that the formation method of the patterned optically anisotropic layer (FPR) is changed to the method of the example described in [0028] to [0035] of JP-T-2012-517024. An optical film 6 (Configuration A), a polarizing plate 6 (FPR external pasting type), and a liquid crystal display device 6 were produced. In Table 1 below, the formation method of the patterned optically anisotropic layer (FPR) in Example 6 is referred to as “method B”.

[Example 7]
A polarizing plate 7 (FPR externally attached type) and a liquid crystal display device 7 were produced in the same manner as in Example 3 except that the optical film 3 (Configuration A) was used and the front side polarizing plate was produced by the following method. Was made.

(Production of polarizer)
According to Example 1 of Unexamined-Japanese-Patent No. 2001-141926, iodine was made to adsorb | suck to the stretched polyvinyl alcohol film, and the 20-micrometer-thick polarizer was produced.

(Preparation of polarizer protective film)
In a reaction vessel having an internal volume of 30 L equipped with a stirrer, a temperature sensor, a cooling pipe and a nitrogen introduction pipe, 8000 g of methyl methacrylate (MMA), 2000 g of methyl 2- (hydroxymethyl) acrylate (MHMA) and 10000 g of toluene as a polymerization solvent Was heated up to 105 ° C. while passing nitrogen through it. When the reflux accompanying the temperature rise began, 10.0 g of t-amylperoxyisonononanoate was added as a polymerization initiator, and a solution comprising 20.0 g of t-amylperoxyisonononanoate and 100 g of toluene was added. While dropping over time, solution polymerization was allowed to proceed under reflux at about 105 to 110 ° C., and further aging was performed for 4 hours. The polymerization reaction rate was 96.6%, and the content (weight ratio) of MHMA in the obtained polymer was 20.0%.

  Next, 10 g of stearyl phosphate / distearyl phosphate mixture (manufactured by Sakai Chemical Industry Co., Ltd., Phoslex A-18) is added to the resulting polymerization solution as a cyclization catalyst, and the mixture is refluxed at about 80 to 100 ° C. for 5 hours. The cyclization condensation reaction was allowed to proceed.

  Next, the obtained polymerization solution was subjected to a barrel type screw twin screw extruder having a barrel temperature of 260 ° C., a rotation speed of 100 rpm, a degree of vacuum of 13.3 to 400 hPa (10 to 300 mmHg), a rear vent number of 1, and a forevent number of 4. (Φ = 29.75 mm, L / D = 30) was introduced at a treatment rate of 2.0 kg / hour in terms of resin amount, and cyclization condensation reaction and devolatilization were performed in the extruder. Next, after completion of devolatilization, the resin in the molten state left in the extruder is discharged from the tip of the extruder, pelletized by a pelletizer, and transparent pellets made of an acrylic resin having a lactone ring structure in the main chain Got. The weight average molecular weight of this resin is 148,000, the melt flow rate (based on JIS K7120, the test temperature is 240 ° C., the load is 10 kg, the same applies to the following production examples) is 11.0 g / 10 min, glass transition The temperature was 130 ° C.

  Next, the obtained pellets and AS resin (product name: Toyo AS AS20, manufactured by Toyo Styrene Co., Ltd.) were kneaded using a single screw extruder (φ = 30 mm) at a weight ratio of pellet / AS resin = 90/10. As a result, transparent pellets having a glass transition temperature of 127 ° C. were obtained.

  The resin composition pellets prepared above were melt-extruded from a coat hanger type T die using a twin-screw extruder to prepare a resin film having a thickness of about 160 μm.

  Next, the obtained unstretched resin film is simultaneously biaxially stretched 2.0 times in the longitudinal direction (length direction) and 2.0 times in the transverse direction (width direction), thereby protecting the polarizer protective film. Was made. The polarizer protective film thus obtained had a thickness of 40 μm, a total light transmittance of 92%, a haze of 0.3%, and a glass transition temperature of 127 ° C.

(Preparation of front-side polarizing plate)
The polarizer protective film prepared above was bonded to both surfaces of the polarizer obtained above using an acrylic adhesive after corona-treating the bonding surface with the polarizer.

[Example 8]
The optical film 8 and the polarizing plate 8 (FPR) were produced in the same manner as in Example 7, except that the base film (TAC) was changed to an acrylic film produced in the same manner as the polarizer protective film produced in Example 7. External bonding type) and liquid crystal display device 8 were produced.

[Example 9]
The optical film 9 (Configuration B) and the polarizing plate 9 are formed in the same manner as in Example 6 except that the antiglare hard coat layer, the base film, the low moisture permeable layer, and the patterned optically anisotropic layer are layered in this order. (FPR external pasting type) and the liquid crystal display device 9 were produced.

[Example 10]
The optical film 10 (Configuration B) and the polarizing plate 10 are produced in the same manner as in Example 7 except that the antiglare hard coat layer, the base film, the low moisture permeability layer, and the patterned optically anisotropic layer are layered in this order. (FPR external pasting type) and the liquid crystal display device 10 were produced.

[Example 11]
The optical film 11 (Configuration B) and the polarizing plate 11 are formed in the same manner as in Example 8 except that the antiglare hard coat layer, the base film, the low moisture permeable layer, and the patterned optically anisotropic layer are layered in this order. (FPR external bonding type) and the liquid crystal display device 11 were produced.

[Example 12]
The optical film 12 (Configuration C) and the polarizing plate 12 are the same as in Example 6 except that the antiglare hard coat layer, the base film, the patterned optically anisotropic layer, and the low moisture permeable layer are layered in this order. (FPR external pasting type) and the liquid crystal display device 12 were produced.

[Example 13]
The optical film 13 (Configuration C) and the polarizing plate 13 are formed in the same manner as in Example 7 except that the antiglare hard coat layer, the base film, the patterned optically anisotropic layer, and the low moisture permeable layer are layered in this order. (FPR external pasting type) and the liquid crystal display device 13 were produced.

[Example 14]
The optical film 14 (Configuration C) and the polarizing plate 14 are formed in the same manner as in Example 8 except that the antiglare hard coat layer, the base film, the patterned optically anisotropic layer, and the low moisture permeable layer are layered in this order. (FPR external pasting type) and the liquid crystal display device 14 were produced.

[Example 15]
A polarizing plate 15 (integrated FPR type) and a liquid crystal display device 15 were manufactured in the same manner as in Example 1 except that the optical film 1 (Configuration A) was used and the method for producing the front side polarizing plate was performed by the following method. Produced.

(Preparation of front-side polarizing plate)
The surface which laminated | stacked the pattern optical anisotropic layer of the produced optical film 3 was bonded using the acrylic adhesive with respect to the single side | surface of the polarizer produced above. The saponified commercially available cellulose acylate film ZRD40 was attached to the other side of the polarizer prepared above using a polyvinyl alcohol-based adhesive, and dried at 70 ° C. for 10 minutes or more to prepare a polarizing plate.
Under the present circumstances, it arrange | positioned so that the longitudinal direction of the produced roll of a polarizer and the longitudinal direction of an optical film may become parallel. Moreover, it arrange | positioned so that the longitudinal direction of the roll of a polarizer and the longitudinal direction of the roll of the said cellulose acylate film ZRD40 may become parallel.

[Example 16]
A polarizing plate 16 (FPR integrated type) and a liquid crystal were produced in the same manner as in Example 2 except that the optical film 2 (Configuration A) was used and the front side polarizing plate was produced in the same manner as in Example 15. A display device 16 was produced.

[Example 17]
A polarizing plate 17 (FPR integrated type) and a liquid crystal were produced in the same manner as in Example 3 except that the optical film 3 (Configuration A) was used and the front side polarizing plate was produced in the same manner as in Example 15. A display device 17 was produced.

[Example 18]
A polarizing plate 18 (FPR integrated type) and a liquid crystal were produced in the same manner as in Example 4 except that the optical film 4 (Configuration A) was used and the front side polarizing plate was produced in the same manner as in Example 15. A display device 18 was produced.

[Example 19]
An optical film 19 (Configuration A) is produced by the same method as in Example 3, except that the base film (TAC) is changed to an acrylic film produced by the same method as the polarizer protective film produced in Example 7. did.
A polarizing plate 19 (integrated FPR type) and a liquid crystal display device 19 were produced in the same manner as in Example 3 except that the optical film 19 was used and the front side polarizing plate was produced in the same manner as in Example 15. Was made.

[Example 20]
A polarizing plate 20 (FPR integrated type) and a liquid crystal were produced in the same manner as in Example 5 except that the optical film 5 (Configuration A) was used and the front side polarizing plate was produced in the same manner as in Example 15. A display device 20 was produced.

[Example 21]
By the same method as in Example 5, except that the method for forming the patterned optically anisotropic layer (FPR) is changed to the method of the example described in [0028] to [0035] of JP-T-2012-517024. An optical film 21 (Configuration A) was produced.
Using this optical film 21 (Configuration A), a polarizing plate 21 (FPR integrated type) and a front side polarizing plate were produced in the same manner as in Example 5 except that the production method of the front side polarizing plate was carried out in the same manner as in Example 15. A liquid crystal display device 21 was produced.

[Example 22]
The method of forming the patterned optically anisotropic layer (FPR) is changed to the method of the embodiment described in [0028] to [0035] of JP-T-2012-517024, and the thickness of the low moisture permeable layer is changed to 15 μm. An optical film 22 (Configuration A) was produced in the same manner as in Example 7 except that.
Using this optical film 22 (Configuration A), the polarizing plate 22 (FPR integrated type) and the front side polarizing plate were produced in the same manner as in Example 7 except that the method for producing the front side polarizing plate was carried out in the same manner as in Example 15. A liquid crystal display device 22 was produced.

[Example 23]
An optical film 23 (Configuration B) was produced in the same manner as in Example 3 except that the antiglare hard coat layer, the base film, the low moisture permeable layer, and the patterned optically anisotropic layer were layered in this order.
Using this optical film 23 (Configuration B), a polarizing plate 23 (an FPR integrated type) and a front side polarizing plate were produced in the same manner as in Example 3 except that the method for producing the front side polarizing plate was carried out in the same manner as in Example 15. A liquid crystal display device 23 was produced.

[Example 24]
An optical film 24 (Configuration C) was produced in the same manner as in Example 3 except that the antiglare hard coat layer, the base film, the patterned optically anisotropic layer, and the low moisture permeable layer were layered in this order.
Using this optical film 24 (Configuration C), the polarizing plate 24 (FPR integrated type) and the polarizing plate 24 (FPR integrated type) and the manufacturing method of the front side polarizing plate were performed in the same manner as in Example 15 except that the same method as in Example 15 was used. A liquid crystal display device 24 was produced.

[Comparative Example 1]
An optical film A, a polarizing plate A (FPR integrated type), and a liquid crystal display device A were produced in the same manner as in Example 1 except that the low moisture-permeable layer was not provided.

[Comparative Example 2]
An optical film B, a polarizing plate B (integrated FPR) and a liquid crystal display device B were produced in the same manner as in Example 15 except that the low moisture-permeable layer was not provided.

  The moisture permeability of each optical film produced, the front crosstalk of each liquid crystal display device, 3D display unevenness, and durability were measured and evaluated by the following methods. These results are shown in Table 1 below.

(1) Moisture permeability (moisture permeability at 40 ° C and 90% relative humidity)
Each produced optical film sample 70 mmφ was conditioned at 40 ° C. and 90% relative humidity for 24 hours, respectively, according to the method described in “Moisture permeability test method of moisture-proof packaging material (cup method)” of JIS Z 0208: 1976. The moisture permeability was measured.
In addition, the moisture permeability (A) of the laminate obtained by laminating the separately prepared base film and the low moisture permeability layer and the moisture permeability (B) of the base film alone were measured by the same method, and were described above. A / B in the general formula (1) was calculated.

(2) Front crosstalk Based on display performance in a 25 ° C. and 55% RH environment as a reference, the performance after leaving the liquid crystal display device in a 60 ° C. Dry thermo environment for 3 hours and 65 ° C. and 95% Wet thermo environment 3 The properties within 24 hours after being allowed to stand for 25 days at 25 ° C. and 55% RH were measured and evaluated under the above conditions, and the property with the most deteriorated performance was used as an evaluation index.

Toshiba 3D glasses and a measuring instrument (BM-5A Topcon) were placed on the front of the liquid crystal display device displaying a striped image in which white and black were alternately arranged in the vertical direction. The front luminance C is measured by placing a measuring instrument at a position through which the white stripe can be seen through the 3D glasses, and then the stripe image with the white and black positions switched is displayed. Similarly, the front luminance D was measured using glasses of No. 5 and the left eye crosstalk was calculated using the following equation.
Crosstalk = (Front luminance D / Front luminance C) × 100%

(3) 3D display unevenness (forced evaluation)
Forcible evaluation of 3D display unevenness was performed using an image in which 3D display unevenness was easily visible. Display a striped image with white and black alternately arranged in the vertical direction on the liquid crystal display device, wear 3D glasses, and shield the glasses on the side where the white stripe is visible on the front, and observe the liquid crystal display device And evaluated according to the following criteria. In this evaluation, the black display portion in the display surface means that there is no or little crosstalk, and the portion where the luminance leakage is visually recognized and the white display portion mean that there is crosstalk.
(Evaluation criteria)
A: In the compulsory evaluation, the entire display surface is displayed in black and no crosstalk is visually recognized, or a slight luminance leakage is permissible, but is acceptable, and even in the evaluation by the 3D video source, the crosstalk is not visually recognized. .
B: Although luminance leakage is visually recognized in the forced evaluation, almost no crosstalk is visually recognized in the evaluation using the 3D moving image source.
C: Luminance leakage is visually recognized even in the forced evaluation, and crosstalk is visually recognized even in the evaluation by the 3D moving image source.

(4) Durability Each of the produced liquid crystal display devices was left in an environment of 65 ° C. and a relative humidity of 95% for a long time, and durability was evaluated according to the following criteria.
(Evaluation criteria)
A: There is no peeling or floating of the optical film.
B: A float of 5 mmφ or less is observed on the optical film.
C: A float of 5 mmφ or more is observed on the optical film, or peeling from the end of the display device is 1 cm or more.

  From the results shown in Table 1, by using an optical film provided with a low moisture permeable layer as compared with the optical films prepared in Comparative Examples 1 and 2 where no low moisture permeable layer is provided, the layer configuration and polarization It was found that an image display device with reduced crosstalk and excellent durability can be produced regardless of the plate configuration.

DESCRIPTION OF SYMBOLS 10 Optical film 12 Base film 14 Low moisture-permeable layer 16 Pattern optically anisotropic layer 16a 1st phase difference area | region 16b 2nd phase difference area | region 17a Slow axis of 1st phase difference area | region 17b Slow phase of 2nd phase difference area | region Axis 18 Hard coat layer 20 Polarizing plate 22 Polarizer (viewing side)
24, 26 Polarizer protective film 23 Polarizer absorption axis 30 Pattern circularly polarizing plate 40 Liquid crystal display device 42 Liquid crystal cell 44 Polarizer (backlight side)
46, 48 Polarizer protective film

Claims (10)

An optical film having a base film, a low moisture-permeable layer, and a patterned optically anisotropic layer,
An optical film that satisfies the following formula (1) and has a moisture permeability of 120 g / m ² / day or less.
A / B ≦ 0.6 (1)
(In the formula, A represents the moisture permeability of a laminate obtained by laminating the substrate film and the low moisture-permeable layer, and B represents the moisture permeability of the substrate film.)   The low moisture-permeable layer is an all solid excluding inorganic components from at least one compound (A) selected from the group consisting of a compound (A1) having a cyclic aliphatic hydrocarbon group and a compound (A2) having a fluorene ring The optical film according to claim 1, which is contained in an amount of 50 to 99% by mass with respect to the minute. The optical film according to claim 2, wherein the cyclic aliphatic hydrocarbon group of the compound (A1) is a group represented by the following general formula (I).

(In the formula, L and L ′ each independently represent a divalent or higher valent linking group, and n represents an integer of 1 to 3.)   The optical film according to claim 2 or 3, wherein the low moisture-permeable layer further contains a rosin compound (B).   The optical film according to any one of claims 2 to 4, wherein the low moisture-permeable layer further contains inorganic fine particles (C) having an average particle diameter of 30 nm or more and 100 nm or less.   The optical film of any one of Claims 1-5 in which the said low moisture-permeable layer contains 50-99 mass% of cyclic polyolefin resin (D).   The optical film according to claim 6, wherein an adhesive layer is provided between a layer adjacent to the low moisture-permeable layer and the low moisture-permeable layer among the base film and the patterned optically anisotropic layer.   A polarizing plate comprising the optical film according to claim 1 and a polarizer.   The polarizing plate according to claim 8, wherein the optical film is disposed on one main surface of the polarizer, and an acrylic film is disposed on the other main surface of the polarizer.   The image display apparatus which has the polarizing plate of Claim 8 or 9, and has arrange | positioned the optical film which the said polarizing plate has as an outermost surface.