KR20140047548A - Optical film and method for producing the same, polarizing plate, and liquid crystal display device - Google Patents

Abstract

(Problem) Provide the optical film which can reduce the curl of a film, and its manufacturing method. It is providing the liquid crystal display device in which the black display nonuniformity after the high temperature, high humidity environment time elapsed was suppressed.
(Solution means) An optical film having a base film containing a (meth) acrylic polymer as a main component, a low moisture-permeable layer laminated on the base film, a method for producing the same, and a liquid crystal display device using the film, wherein A water vapor transmission rate is 100 g / m <2> / day or less, and satisfy | fills following formula (1).
Equation (1) 0.01 ≤ A / B ≤ 0.8
(In Formula (1), A shows the water vapor transmission rate of the optical film which laminated | stacked the said low moisture-permeable layer on the said base film, and B shows the water vapor transmission rate of the said base film. However, a water vapor transmission rate is 40 degreeC by the method of JIS0208, It is the value after elapse of 24 hours at 90% of relative humidity.)

Description

Optical film and its manufacturing method, polarizing plate, and liquid crystal display device {OPTICAL FILM AND METHOD FOR PRODUCING THE SAME, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to an optical film, a manufacturing method thereof, a polarizing plate, and a liquid crystal display device.

Background Art In recent years, liquid crystal displays have been widely used in liquid crystal televisions, liquid crystal panels such as PCs, mobile phones, and digital cameras. Usually, a liquid crystal display device has the liquid crystal panel member which provided the polarizing plate in the both sides of the liquid crystal cell, and display is performed by controlling the light from a backlight member to a liquid crystal panel member. Here, a polarizing plate consists of a polarizer and the protective film of both sides, a general polarizer is obtained by dyeing an elongate polyvinyl alcohol (PVA) type film with an iodine or a dichroic dye, and a cellulose ester film etc. are used as a protective film. have.

Background Art In recent years, liquid crystal display devices have not only increased quality but also diversified applications, and demand for durability is becoming strict. For example, in use for outdoor use, stability against environmental changes is required, and dimensions and optical properties of temperature and humidity change also regarding optical films such as the protective film for the polarizing plate and the optical compensation film used in the liquid crystal display device. It is required to suppress the change of the characteristic.

Problems of the liquid crystal display device exposed to an environment of high temperature and high humidity include warpage of the liquid crystal cell of the liquid crystal display device and occurrence of display unevenness, but this is caused by the moisture absorption and desorption of moisture on the polarizing plate and the optical film constituting it, especially the polarizer. It is believed that the cause of shrinkage in the front and rear polarizers of the liquid crystal cell of the display device is that the balance collapses and the liquid crystal cell is bent, and four corners and four sides of the liquid crystal cell come into contact with the casing or the member on the back side to cause display unevenness. . For this reason, although the improvement of humidity dependence and wet heat durability has been calculated | required about the protective film of a polarizing plate, in order to improve radically, it is necessary to suppress moisture absorption and desorption of moisture by environmental changes, and especially in the optical film of the outermost surface of a polarizing plate A performance that does not pass moisture well, that is, a decrease in moisture permeability is required.

Patent Document 1 discloses an optical film in which a large amount of acrylic resin such as polymethyl methacrylate (PMMA) is added to cellulose ester for the purpose of providing an optical film having high transparency, low hygroscopicity, high heat resistance and high mechanical strength. Is disclosed.

On the other hand, the film which provided the low moisture vapor transmission layer on the base film is also known. For example, Patent Document 2 discloses a low-moisture-permeable layer formed of a composition having a compound having a cyclic aliphatic hydrocarbon group and two or more unsaturated double bond groups in a molecule on a base film of cellulose acylate having a thickness of 80 µm. Although the formed film is described, sufficient low moisture permeability was not obtained.

International Publication No. 2009/047924 Japanese Laid-Open Patent Publication No. 2006-83225

The liquid crystal display device has been used not only in the conventional indoor use, but also in more harsh environments such as the outdoors, and the performance of the optical film on the outermost surface of the liquid crystal display device that does not transmit moisture becomes important. This TV problem is also influenced by the tendency that the glass of a liquid crystal cell becomes thin in the TV application which enlarges in recent years, and it becomes easy to bend, and the influence on the black display nonuniformity after time passage in the high temperature, high humidity environment was concerned. In addition, in the small and medium-sized devices such as tablet PCs and mobile applications, which are rapidly spreading in recent years, the space saving in the thinner and liquid crystal display devices is higher, and therefore, there is a strong demand for solving the problem of black display unevenness after elapse of high temperature and high humidity environment.

In view of the above circumstances, the object of the present invention, that is, the problem to be solved by the present invention is to provide an optical film and a method for producing the same, which can reduce the transmission of moisture.

Moreover, the subject which this invention is going to solve is providing the optical film which can reduce the curl of the film discovered by following the said patent document 2, and its manufacturing method.

Another object of the present invention is to provide a polarizing plate using the optical film. Still another object of the present invention is to provide a liquid crystal display device in which black display unevenness after elapse of high temperature and high humidity environment is improved.

In particular, the correlation between the optical film and the curl value is unknown.

As a result of earnestly examining by the present inventors, the optical film which can reduce the permeation | transmission of water can be provided, and the black display nonuniformity after time-lapse of high temperature, high humidity environment is improved by using such an optical film as a protective film of a polarizing plate. It was found that the liquid crystal display device can be provided and the present invention was reached.

The problem to be solved by the present invention can be solved by the present invention which is the following means.

[One]

As an optical film which has a base film which has a (meth) acrylic-type polymer as a main component, and the low moisture-permeable layer laminated | stacked on this base film,

The water vapor transmission rate of the said optical film is 100 g / m <2> / day or less,

The following formula (1) is satisfied, The optical film characterized by the above-mentioned.

Equation (1) 0.01 ≤ A / B ≤ 0.8

(In Formula (1), A shows the water vapor transmission rate of the optical film which laminated | stacked the said low moisture-permeable layer on the said base film, and B shows the water vapor transmission rate of the said base film. However, a water vapor transmission rate is 40 degreeC by the method of JIS0208, It is the value after elapse of 24 hours at 90% of relative humidity.)

[2]

The water vapor transmission rate of the said low moisture vapor transmission layer when the film thickness of the said low moisture vapor transmission layer is 10 micrometers.

J _b × d _b / 10

Is 5.0-250 g / m <2> / day, The optical film as described in said [1] characterized by the above-mentioned.

(Wherein d _b [μm] represents the film thickness of the low moisture-permeable layer and is calculated from the film thickness difference before and after the low-moisture-permeable layer lamination.

In addition, J _b is an optical film base material and shows a water vapor permeability of the low moisture-permeable layer when separated from the low moisture-permeable layer, the moisture permeability of the optical film J _f, J _s a water vapor transmission rate of the base film, the water vapor permeability of the low moisture-permeable layer J _b It is calculated from the following relational formula when we assume.)

1 / J _f = 1 / J _s + 1 / J _b Equation (n)

[3]

Said (meth) acrylic-type polymer is a polymer which has a lactone ring structure, a glutaric anhydride ring structure, and a glutalimide ring structure in a principal chain, The optical film as described in said [1] or [2] characterized by the above-mentioned. .

[4]

The optical film as described in said [3] whose said (meth) acrylic-type polymer is a polymer which has a unit represented by following General formula (1).

In general formula (1):

[Chemical Formula 1]

(In formula, R <^11> , R <^12> , R <^13> shows a hydrogen atom or an organic residue of C1-C20 each independently. Moreover, the organic residue may contain the oxygen atom.)

[5]

The film thickness of the said base film is 5-80 micrometers, The optical film in any one of said [1]-[4] characterized by the above-mentioned.

[6]

The film thickness of the said low moisture-permeable layer is 1-12 micrometers, The optical film in any one of said [1]-[5] characterized by the above-mentioned.

[7]

The said low moisture-permeable layer is a layer formed from the composition for low moisture-permeability which has a compound which has a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in a molecule | numerator, The optical as described in any one of said [1]-[6] characterized by the above-mentioned. film.

[8]

The said low moisture-permeable layer is a layer in which the compound which has a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in a molecule | numerator is formed from the composition containing 60-99 mass% with respect to the total solid except the inorganic component in the composition for low moisture-permeable layer forming. The optical film as described in said [7] characterized by the above-mentioned.

[9]

The said optical film further has a hard-coat layer, The optical film in any one of said [1]-[8] characterized by the above-mentioned.

[10]

The said hard coat layer is a layer formed from the composition for hard-coat layer formation which has a compound which has a cyclic aliphatic hydrocarbon group and 2 or more unsaturated double bond group in a molecule | numerator, The said any one of said [1]-[9] characterized by the above-mentioned. The optical film of Claim.

[11]

The optical film according to the above [10], wherein the hard coat layer-forming composition further contains a 5-functional or higher (meth) acrylate.

[12]

Said low moisture-permeable layer is a layer formed from the composition for low moisture-permeability which has a compound which has a fluorene skeleton and an unsaturated double bond group in a molecule | numerator, The optical film in any one of said [1]-[9] characterized by the above-mentioned. .

[13]

The low-moisture-permeable layer is a layer in which a compound having a fluorene skeleton and an unsaturated double bond group in a molecule is formed of a composition containing 60 to 99 mass% of the total solid except for the inorganic component in the low-moisture-permeable layer-forming composition. The optical film as described in said [12].

[14]

The said base film is formed by melt-forming a thermoplastic resin which has a (meth) acrylic-type polymer as a main component, The optical film in any one of said [1]-[13] characterized by the above-mentioned.

[15]

A process of melt-forming and forming a base film containing (meth) acrylic polymer as a main component,

The manufacturing method of the optical film which has a low moisture-permeable layer laminated | stacked on the base film including the process of laminating | stacking a low moisture-permeable layer on the said base film by application | coating.

[16]

With polarizer,

At least one optical film in any one of said [1]-[14] is contained as a protective film of this polarizer, The polarizing plate characterized by the above-mentioned.

[17]

With a liquid crystal cell,

It includes the polarizing plate as described in said [16] arrange | positioned in at least one of this liquid crystal cell,

The optical film is disposed so as to be the outermost layer.

By this invention, the optical film which can reduce permeation | transmission of water, and its manufacturing method can be provided. By using the optical film of this invention, the liquid crystal display device by which black display nonuniformity generation | occurrence | production after high temperature, high humidity environment time elapsed was suppressed can be provided.

Below, the polarizing plate of this invention, its manufacturing method, the additive used for it, etc. are demonstrated in detail.

Although description of the element | module described below may be made | formed based on typical embodiment of this invention, this invention is not limited to such embodiment. In addition, the numerical range shown using "-" in this specification means the range which includes the numerical value described before and after "-" as a lower limit and an upper limit.

The term &quot; acrylic resin &quot; means a resin obtained by polymerizing a derivative of methacrylic acid or acrylic acid, and a resin containing the derivative. In addition, when it does not specifically limit, "(meth) acrylate" shows an acrylate and a methacrylate, and "(meth) acryl" shows an acryl and methacryl.

And the "ground axis direction" of a film is a direction in which a refractive index becomes largest in a film plane, and a "fast axis direction" shall mean the direction orthogonal to a slow axis in a film plane.

[Method for producing optical film and optical film]

The optical film of this invention is an optical film which has a base film which has a (meth) acrylic-type polymer as a main component, and the low moisture-permeable layer laminated | stacked on this base film, The water vapor transmission rate of the said optical film is 100 g / m <2>. It is less than / day, and it satisfy | fills Formula (1), It is characterized by the above-mentioned.

Equation (1) 0.01 ≤ A / B ≤ 0.8

(In Formula (1), A shows the water vapor transmission rate of the optical film which laminated | stacked the said low moisture-permeable layer on the base film which has a (meth) acrylic-type polymer as a main component, and B represents the base film which has the said (meth) acrylic-type polymer as a main component. The moisture permeability is a value after 24 hours has elapsed at 40 ° C. and a relative humidity of 90% by the method of JIS 0208.)

By the said structure, it is excellent in durability and can permeate | transmit and desorption of moisture.

As for the optical film of this invention, it is more preferable to satisfy following formula (2), It is further more preferable to satisfy following formula (3), It is especially preferable to satisfy following formula (4).

(2) 0.01 ≤ A / B ≤ 0.7

Equation (3) 0.02 ≤ A / B ≤ 0.6

(4) 0.04 ≤ A / B ≤ 0.5

Definition of A and B in said Formula (2)-(4) is the same as that of A and B in said Formula (1).

Moreover, the manufacturing method of the optical film of this invention is laminated | stacked on the base film including the process of melt-forming a thermoplastic resin and forming a base film, and the process of laminating | stacking a low moisture-permeable layer on the said base film by application | coating. It is a manufacturing method of the optical film which has the low water vapor barrier.

The water vapor transmission rate of the optical film manufactured by the said manufacturing method is 100 g / m <2> / day or less, and it is preferable to satisfy following formula (1).

Equation (1) 0.01 ≤ A / B ≤ 0.8

(In formula (1), A shows the water vapor transmission rate of the optical film which laminated | stacked the said low moisture-permeable layer on the base film containing the said thermoplastic resin, and B shows the water vapor transmission rate of the said base film. However, a water vapor transmission rate is JIS 0208. By the method, it is a value after 24 hours pass at 40 degreeC and 90% of a relative humidity.)

By the said structure, the optical film of this invention can be manufactured.

Hereinafter, the preferable aspect of the optical film of this invention and its manufacturing method is demonstrated.

{Properties of optical film}

(Film thickness of optical film)

5-100 micrometers is preferable, as for the film thickness of the optical film of this invention (total film thickness after laminating | stacking a low moisture-permeable layer on a base film), 10-80 micrometers is more preferable, 15-75 micrometers is especially preferable.

(Moisture permeability of optical film)

The water vapor transmission rate of the optical film of this invention is measured on 40 degreeC and the conditions of 90% of a relative humidity based on JISZ-0208.

The water vapor transmission rate of the optical film of this invention is 100 g / m <2> / day or less, It is preferable that it is 90 g / m <2> / day or less, It is more preferable that it is 80 g / m <2> / day or less, It is further more preferable that it is 70 g / m <2> / day or less. It is especially preferable that it is 60 g / m <2> / day. When water vapor transmission rate is 100 g / m <2> / day or less, the curvature of the liquid crystal cell after time-lapse of normal temperature, high humidity, and high temperature, high humidity environment of a liquid crystal display device, and the display unevenness at the time of black display can be suppressed.

(Retardation)

In the optical film of the present invention, it is preferable that Re and Rth (defined by the following formulas (I) and (II)) measured at a wavelength of 590 nm 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

(Nx) In formula (I)-(IV), nx is the refractive index of the slow-axis direction in the film plane of the said optical film, ny is the refractive index of the fast axis direction in the film plane of the said optical film, nz is the film | membrane of the said optical film Is the refractive index in the thickness direction, and d is the film thickness (nm) of the optical film.)

Moreover, in the optical film of this invention, although said Formula (III) and (IV) should just satisfy | fill at least 1 point in a film plane, said Formula (III) and (IV) are satisfied at arbitrary points in a film plane. It is preferable.

Re and Rth of the optical film of this invention can be adjusted with the adjustment method of Re and Rth of the said base film mentioned later, the composition and film thickness of the said low moisture-permeable layer, the total film thickness of the optical film of this invention, etc.

{Low moisture vapor layer}

(Film thickness of low moisture vapor barrier)

In the present invention, the low moisture-permeable layer refers to a layer having a low water vapor transmission rate per unit film thickness, and more specifically, it is preferable that the water vapor transmission rate per film thickness of 10 µm is 5.0 to 250 g / m 2 / day.

It is preferable that the film thickness of the said low moisture-permeable layer is 1-20 micrometers, It is more preferable that it is 2-18 micrometers, It is especially preferable that it is 3-17 micrometers.

(Water vapor per unit film thickness of the low moisture vapor barrier)

It is generally known that the water vapor transmission rate in a steady state is inversely proportional to the film thickness. Therefore, the water vapor transmission rate that can be reached by the low moisture-permeable layer in the film thickness range is determined by the water vapor transmission rate per unit film thickness, which is a characteristic value of the material, and the smaller the value, the lower the water vapor transmission rate. On the other hand, although the moisture permeability can be adjusted by adjusting the film thickness of the low moisture-permeable layer based on the said relationship, when the moisture permeability per unit film thickness is too low, it becomes difficult to control the water vapor transmission rate of an optical film.

In consideration of both, the water vapor permeability per 10 μm of the low moisture-permeable layer is preferably 5.0 to 250 g / m 2 / day, more preferably 10 to 200 g / m 2 / day, and 20 to 150 g / m 2 / day More preferably, 30-130 g / m <2> / day is especially preferable. (The moisture permeability is the method after 24 hours passed at 40 degreeC and 90% of a relative humidity by the method of JIS0208.)

On the other hand, the water vapor transmission rate per film thickness of 10 micrometers of a low water vapor transmission rate is estimated as follows from the water vapor transmission rate of a base film and an optical film, and the film thickness of a low water vapor transmission layer.

From the gas permeation type of the composite film (for example, `` Science of packaging material (Packaging Basic Course 5) '' p68-72 Tsutomu Nippon Packaging Society), the moisture permeability of the optical film in the normal state is described by J _f , when the water vapor permeability of the low moisture-permeable layer when removing the moisture permeability of the film with the low moisture-permeable layer J _s, an optical film to a base film J _b, the following expression is established.

1 / J _f = 1 / J _s + 1 / J _b Formula (n)

Moisture permeability of optical film J _f And water vapor transmission rate of base film J _s Can be measured directly, and the water vapor transmission rate J _b of the low moisture-permeable layer can be calculated | required based on these measurements.

Water vapor transmission rate C _b (10 ㎛) to the thickness of the low moisture-permeable film 10 ㎛ layer is calculated from the J _b Can be represented by the following formula.

C _b (10 μm) = J _b × d _b / 10 [g / m 2 / day]

(Here, d _b [μm] is the film thickness of the low moisture-permeable layer, and can be obtained from the film thickness difference before and after the low-moisture-permeable layer stacking as described above.)

(Composition of low moisture vapor barrier)

The low-moisture-permeable layer that can be used for the optical film of the present invention may be formed of any material as long as the optical film of the present invention satisfies the above formula (1), but is at least cyclic aliphatic hydrocarbon group and unsaturated in the molecule. It is preferably a layer formed of a composition containing a compound having a double bond, or a layer having a resin containing a repeating unit derived from at least a chlorine-containing vinyl monomer, and having a cyclic aliphatic hydrocarbon group and an unsaturated double bond in the molecule. It is more preferable that it is a layer formed from the compound and / or the composition containing the compound which has a fluorene ring and an unsaturated double bond group in a molecule | numerator.

A layer formed of a composition containing a compound having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in the molecule and / or a compound having a fluorene ring and an unsaturated double bond group in the molecule will be described.

<< layer formed from the composition which has a compound which has a cyclic aliphatic hydrocarbon group and unsaturated double bond group in a molecule as a main component >>

In the present invention, the layer formed of a compound containing a compound having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in a molecule and / or a compound having a fluorene skeleton and an unsaturated double bond group in a molecule is used to impart low moisture permeability. , A composition having a cyclic aliphatic hydrocarbon group and also having an unsaturated double bond group in a molecule, and optionally further comprising a polymerization initiator, a light-transmitting particle, a fluorine-containing or silicone-based compound, a composition containing a solvent directly on a support or It can form by apply | coating, drying, and hardening through another layer. Each component is demonstrated below.

[Compound having cyclic aliphatic hydrocarbon group and unsaturated double bond group in molecule]

By using a compound having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in the molecule, low moisture permeability and high membrane strength are realized. Although the details are not clear, by using a compound having a cyclic aliphatic hydrocarbon group in the molecule, a hydrophobic cyclic aliphatic hydrocarbon group is introduced into the low water vapor permeable layer and hydrophobized, thereby preventing the incorporation of molecules from the outside and lowering the moisture permeability. Furthermore, having an unsaturated double bond group in the molecule raises the crosslinking point density, thereby restricting the diffusion path of water molecules in the low moisture vapor barrier. Increasing the crosslinking point density also has the effect of relatively increasing the density of the cyclic aliphatic hydrocarbon group, which is considered to be more hydrophobic in the low water vapor barrier, thereby preventing the adsorption of moisture and lowering the water vapor transmission rate.

In order to raise a crosslinking point density, it is more preferable that the number of the unsaturated double bond groups which have in a molecule | numerator is two 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, more preferably a group derived from an alicyclic compound having 12 or more carbon atoms .

The cyclic aliphatic hydrocarbon group is particularly preferably a group derived from a polycyclic compound such as a bicyclic or tri-cyclic group.

More preferably, the central skeleton of the compound described in the claims of JP 2006-215096, the central skeleton of the compound described in JP 2001-10999, the skeleton of an adamantane derivative, and the like. .

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

(2)

In General Formula (I), L and L 'respectively independently represent a bivalent or more coupling group. n represents the integer of 1-3.

(3)

In General Formula (II), L and L 'respectively independently represent a bivalent or more coupling group. and n represents an integer of 1 to 2.

[Chemical Formula 4]

In general formula (III), L and L 'respectively independently represent a bivalent or more coupling group. and n represents an integer of 1 to 2.

[Chemical Formula 5]

In General Formula (IV), L and L 'respectively independently represent a bivalent or more coupling group, and L' 'represents a hydrogen atom or a bivalent or more coupling group.

[Chemical Formula 6]

In General Formula (V), L and L 'respectively independently represent a bivalent or more coupling group.

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

As the unsaturated double coupler, (meth) acryloyl group, vinyl group, styryl group, there may be mentioned a polymerizable functional group such as an allyl group, among them, (meth) group and a -C (O) OCH = CH ₂ Acrylic . Especially preferably, the compound containing three or more (meth) acryloyl groups in 1 molecule which can be used can be used.

The compound which has a cyclic aliphatic hydrocarbon group and has 3 or more unsaturated double bond groups in a molecule | numerator is comprised by the above-mentioned group which has a cyclic aliphatic hydrocarbon group and an unsaturated double bond couple | bonding through a linking group.

Examples of the linking group include a single bond, an alkylene group which may be substituted with 1 to 6 carbon atoms, an amide group which may be substituted for the N position, a carbamoyl group that may be substituted for the N position, an ester group, an oxycarbonyl group, an ether group, and the like. And groups obtained by combining these.

These compounds are the carboxylic acid, carboxyl of the polyol, such as diol and triol which have the said cyclic aliphatic hydrocarbon group, and the compound which has a (meth) acryloyl group, a vinyl group, a styryl group, an allyl group, etc., for example. It can be easily synthesized by one-step or two-step reaction with an acid derivative, an epoxy derivative, an isocyanate derivative, and the like.

Preferably, compounds, such as (meth) acrylic acid, (meth) acryloyl chloride, (meth) acrylic acid anhydride, (meth) acrylic acid glycidyl, and the compounds described in WO2012 / 00316A (eg, 1,1-bis) (Acryloxymethyl) ethyl isocyanate) can be synthesized by reacting with a polyol having the cyclic aliphatic hydrocarbon group.

Hereinafter, although the preferable specific example of a compound which has a cyclic aliphatic hydrocarbon group and has an unsaturated double bond group is shown, this invention is not limited to these.

[Formula 7]

[Chemical Formula 8]

[Compound having fluorene skeleton and unsaturated double bond in molecule]

A compound having a fluorene skeleton and an unsaturated double bond in a molecule functions as a binder in a layer formed of a composition composed mainly of a compound having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in a molecule. Moreover, the compound which has a fluorene skeleton and an unsaturated double bond group can function as a hardening | curing agent, can improve the intensity | strength and scratch resistance of a coating film, and can provide low moisture permeability. By further containing such a compound, low moisture permeability can be further improved.

In order to raise a crosslinking point density, it is more preferable that the number of the unsaturated double bond groups which have in a molecule | numerator is two or more.

It is preferable that the compound which has a fluorene skeleton and unsaturated double bond in a molecule | numerator is represented with the following general formula (VI).

[Chemical Formula 9]

(In formula (VI), R <^1> , R <^2> , R <^3> , R <^4> , R <^5> and R <^6> represent a monovalent substituent each independently, and m, n, p, and q are the integers of 0-4 each independently. And at least one of R ¹ and R ² represents a monovalent organic group having an ethylenically unsaturated group.)

It is preferable that the compound which has a fluorene skeleton and unsaturated double bond in a molecule | numerator is represented with the following general formula (VII).

[Chemical formula 10]

(In formula, R <^7> , R <^8> represents a hydrogen atom or a methyl group, r and s represent the integer of 0-5.)

[Compound having unsaturated double bond group without ring aliphatic hydrocarbon group]

In the composition for low moisture-permeable layer formation used for this invention, the compound which has an unsaturated double bond which does not have a cyclic aliphatic hydrocarbon group in a molecule | numerator can be used together in the range which does not impair the effect of this invention.

As a compound which has an unsaturated double bond group which does not have a cyclic aliphatic hydrocarbon group, it is preferable that it is a (meth) acrylate compound which does not have a cyclic aliphatic hydrocarbon group, The (meth) acrylic acid diesters of polyalkylene 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 And polyester (meth) acrylates.

Especially, ester of polyhydric alcohol and (meth) acrylic acid is 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 phosphoric acid tri (meth) acrylate, trimethylolethane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol tetra (meth) Acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, polyurethane polyacrylate, polyester polyacrylate, Caprolactone modified tris (acryloxyethyl) isocyanurate etc. are mentioned.

As the polyfunctional acrylate compound having a (meth) acryloyl group, a commercially available one may be used, and NK ester A-TMMT manufactured by Shin-Nakamura Chemical Industry Co., Ltd., KAYARAD DPHA manufactured by Nippon Gunpowder Co., Ltd. Can be mentioned. The multifunctional monomers are described in paragraphs [0114] to [0122] of Japanese Laid-Open Patent Publication No. 2009-98658, and the same applies to the present invention.

As a compound which has an unsaturated double bond group which does not have a cyclic aliphatic hydrocarbon group, it is preferable that it is a compound which has a hydrogen bondable substituent from a viewpoint of adhesiveness with a support, low curl, and fixing property of the fluorine-containing or silicone type compound mentioned later. The hydrogen bondable substituent refers to a substituent in which an electronegative atom such as nitrogen, oxygen, sulfur, or halogen and a hydrogen bond are covalently formed, and specifically, OH-, SH-, -NH-, and CHO-. , CHN- and the like, and urethane (meth) acrylates and (meth) acrylates having a hydroxyl group are preferable. A commercially available polyfunctional acrylate having a (meth) acryloyl group can also be used, and NK oligo U4HA, the same NK ester A-TMM-3, Nippon Gunpowder (manufactured by Shin-Nakamura Chemical Co., Ltd.) KAYARAD PET-30 etc. are mentioned.

[Inorganic layered compound]

In order to further reduce the moisture permeability of the coating layer of this invention, it is also preferable to disperse an inorganic layer compound in the binder which can be used for the low moisture-permeable layer mentioned above. Since the inorganic layered compound has a hydrophilic surface, organic treatment is preferable.

The inorganic layered compound is an inorganic compound having a structure in which unit crystal layers are laminated and has a property of swelling or cleavage by coordinating or absorbing a solvent between layers. Examples of such inorganic compounds include swellable hydrous silicates such as smectite group clay minerals (montmorillonite, saponite, hectorite, etc.), vermiculite group clay minerals, kaolinite group minerals, FILO silicates (mica, etc.) and the like. Can be. Moreover, a synthetic inorganic layered compound is also used preferably, As a synthetic inorganic layered compound, synthetic smectite (hectorite, saponite, stevensite, etc.), synthetic mica, etc. are mentioned, smectite, montmorillonite, mica number Preferably, montmorillonite and mica are more preferable. As an inorganic layer compound which can be used as a commercial item, MEB-3 (Cope Chemical Co., Ltd. synthetic mica aqueous dispersion), ME-100 (Cope Chemical Co., Ltd. synthetic mica), S1ME (Cope Chemical Co., Ltd. synthesis) Mica), SWN (synthetic smectite manufactured by Kope Chemical Co., Ltd.), SWF (synthetic smectite manufactured by Kope Chemical Co., Ltd.), Kunipia F (manufactured by Benignite Co., Ltd.) Purified bentonite), Bengel HV (manufactured by Horsham Co., Ltd.), Bengel FW (manufactured by Horsham Co., Ltd.), Bengel Bright11 (manufactured by Horsham Co., Ltd. Purified bentonite), Bengel Bright 25 (purified bentonite manufactured by Horsham Co., Ltd.), Bengel A (purified bentonite manufactured by Horsham Co., Ltd.), Bengel 2M (purified bentonite manufactured by Horsham Co., Ltd.) and the like can be used.

Moreover, it is preferable that such an inorganic layer compound performed the organic treatment to these inorganic layer compounds.

The swellable layered inorganic compound is preferably micronized in view of achieving low moisture permeability and adhesion between the substrate and the low moisture-permeable layer. The swellable layered inorganic compound subjected to the micronization treatment is usually plate or flat, and the planar shape is not particularly limited, and may be amorphous or the like. 0.1-10 micrometers is preferable, for example, 0.1-8 micrometers is preferable, and, as for the average particle diameter (planar average particle diameter) of the swellable layered inorganic compound processed into microparticles | fine-particles, 0.1-6 micrometers is especially preferable.

[Polymerization Initiator]

It is preferable to contain a polymerization initiator in a composition containing a compound having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in a molecule and / or a compound having a fluorene skeleton and an unsaturated double bond group in a molecule. As a polymerization initiator, a photoinitiator is preferable.

As a photoinitiator, acetophenone, benzoin, benzophenone, phosphine oxide, ketal, anthraquinone, thioxanthone, an azo compound, a peroxide, a 2, 3- dialkyl dione compound, disul Fused compounds, fluoroamine compounds, aromatic sulfoniums, lophine dimers, onium salts, borate salts, active esters, active halogens, inorganic complexes, coumarins and the like. Specific examples of the photopolymerization initiator, preferred embodiments, commercial products, and the like are described in paragraphs [0133] to [0151] of JP2009-098658A and can be preferably used in the present invention as well.

`` Latest UV Curing Technology '' {Technical Information Association} (1991), p.159, and `` Ultraviolet Curing System '' by Kato Kiyomi (1989, Comprehensive Technology Center), p.65 to 148 Described and useful in the present invention.

As a commercially available photo cleavage type optical radical polymerization initiator, "Irgacure 651", "Irgacure 184", "Irgacure 819", "Irgacure 907" of Chiba Specialty Chemicals Co., Ltd. make, `` 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" and the like; `` Gayacure DETX-S '', `` Gayacure BP-100 '', `` Gayacure BDMK '', `` Gayacure CTX '', `` Gayacure BMS '', `` Gayacure 2-EAQ '', manufactured by Nippon Gunpowder Co., Ltd. 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)" manufactured by Sartomer Co., Ltd., and combinations thereof are exemplified as preferred examples.

Content of the photoinitiator in the composition containing the compound which has a cyclic aliphatic hydrocarbon group and unsaturated double bond group in the molecule used for this invention, and / or the compound which has a fluorene skeleton and unsaturated double bond group in a molecule | numerator is superposition | polymerization contained in the said composition. In order to superpose | polymerize a possible compound and to set it so that a starting point may not be blown too much, 0.5-8 mass% is preferable with respect to the total solid in a composition, and 1-5 mass% is more preferable.

[UV absorber]

Although the optical film of this invention containing a low moisture vapor transmission layer is used for a polarizing plate or a liquid crystal display device member, in view of prevention of deterioration, such as a polarizing plate or a liquid crystal, it can provide ultraviolet absorbency to an optical film by containing an ultraviolet absorber in a low moisture vapor transmission layer. It may be.

[solvent]

The composition which has a compound which has a cyclic aliphatic hydrocarbon group and unsaturated double bond group in the molecule used for this invention as a main component can contain a solvent. Various solvents can be used as a solvent in consideration of the solubility of a monomer, the drying property at the time of coating, the dispersibility of light-transmitting particle, etc.

As such an organic solvent, for example, dibutyl ether, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydro Furan, anisole, phentol, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, acetone, methyl ethyl ketone (MEK), diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone, methyl Cyclohexanone, ethyl formate, propyl formate, pentyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, γ-butyrolactone, 2-methoxy acetate, methyl 2-ethoxyacetate, 2- Ethyl ethoxyacetate, 2-ethoxypropionate, 2-methoxyethanol, 2-propoxyethanol, 2-butoxyethanol, 1,2-diacetoxyacetone, acetylacetone, diacetone alcohol, methyl acetacetate, Methyl alcohol, ethyl alcohol, such as ethyl acetate, Examples of the solvent include isopropyl alcohol, isopropyl alcohol, n-butyl alcohol, cyclohexyl alcohol, isobutyl acetate, methyl isobutyl ketone (MIBK), 2-octanone, 2-pentanone, 2-hexanone, ethylene glycol ethyl ether, , Ethyleneglycol butyl ether, propyleneglycol methyl ether, ethyl carbitol, butyl carbitol, hexane, heptane, octane, cyclohexane, methylcyclohexane, ethylcyclohexane, benzene, toluene and xylene. They may be used alone or in combination of two or more.

At least one of dimethyl carbonate, methyl acetate, ethyl acetate, methyl ethyl ketone, acetylacetone and acetone is preferably used, more preferably any of dimethyl carbonate and methyl acetate, and methyl acetate is particularly preferred.

It is preferable to use a solvent so that the concentration of the solid content of the composition mainly containing a compound having a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in the molecule used may be in the range of 20 to 80 mass%, more preferably 30 It is-75 mass%, More preferably, it is 40-70 mass%.

(Configuration and Manufacturing Method of Low Water Vapor Layer)

One layer may be sufficient as the said low moisture-permeable layer, and multiple layers may be laminated | stacked. When laminating | stacking two or more layers of low moisture-permeable layers, you may form all on one surface of a base material, and may divide and form on both surfaces. Although the lamination | stacking method of the said low moisture-permeable layer is not specifically limited, It is preferable to manufacture the said low moisture-permeable layer by covalent connection with a base film, or to form the said low moisture-permeable layer by application | coating on the said base film, It is more preferable to form a moisture permeable layer by apply | coating on the said base film.

In addition to low moisture permeability, the low moisture-permeable layer of the optical film of the present invention is preferably provided with a hard coat layer function, an antireflection function, an antifouling function, and the like.

{Substrate film}

The said base film has a (meth) acrylic-type polymer as a main component. In addition, in this application, that a base film has a (meth) acrylic-type polymer as a main component means that it contains 50 mass% or more of (meth) acrylic-type polymers in a base film.

Moreover, a (meth) acrylic-type polymer is a concept containing both a methacryl-type polymer and an acryl-type polymer. The (meth) acrylic polymer also includes derivatives of acrylate / methacrylate, particularly (co) polymers of acrylate ester / methacrylate ester.

((Meth) acrylic polymer)

The repeating structural unit of the (meth) acrylic polymer is not particularly limited. It is preferable that the said (meth) acrylic-type polymer has a repeating structural unit derived from a (meth) acrylic acid ester monomer as a repeating structural unit.

The (meth) acrylic polymer may contain a repeating structural unit which is formed by polymerizing at least one selected from a hydroxyl group-containing monomer, an unsaturated carboxylic acid and a monomer represented by the following general formula (201) as a repeating structural unit. .

General formula (201)

CH ₂ = C (X) R ²⁰¹

In the formula, R ²⁰¹ represents a hydrogen atom or a methyl group, X represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group, a -CN group, and -CO-R ²⁰² Or -O-CO-R ²⁰³ Group and R ²⁰² and R ²⁰³ represent a hydrogen atom or an organic moiety having 1 to 20 carbon atoms.)

Although it does not specifically limit as said (meth) acrylic acid ester, For example, Acrylic ester, such as methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, cyclohexyl acrylate, benzyl acrylate; Methacrylic acid such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, cyclohexyl methacrylate and benzyl methacrylate Esters; These may be used alone or in combination of two or more. Among these, methyl methacrylate is preferable at the point which is excellent in heat resistance and transparency.

When using the said (meth) acrylic acid ester, when the content rate in the monomer component provided to a superposition | polymerization process fully exhibits the effect of this invention, Preferably it is 10-100 mass%, More preferably, it is 10- 100 mass%, More preferably, it is 40-100 mass%, Especially preferably, it is 50-100 mass%.

Although it does not specifically limit as said hydroxyl-containing monomer, For example, 2- (hydroxyalkyl) acrylic acid ester, such as (alpha)-hydroxymethyl styrene, (alpha)-hydroxyethyl styrene, and 2- (hydroxyethyl) acrylate; 2- (hydroxyalkyl) acrylic acid such as 2- (hydroxyethyl) acrylic acid; These etc. are mentioned, These may use only 1 type and may use 2 or more types together.

When using the said hydroxyl group containing monomer, the content rate in the monomer component provided to a polymerization process fully exhibits the effect of this invention, Preferably it is 0-30 mass%, More preferably, it is 0-20 mass %, More preferably, it is 0-15 mass%, Especially preferably, it is 0-10 mass%.

Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, crotonic acid,? -Substituted acrylic acid and? -Substituted methacrylic acid, and they may be used alone or in combination of two or more. You can. Among these, acrylic acid and methacrylic acid are preferable at the point which fully exhibits the effect of this invention.

When using the said unsaturated carboxylic acid, the content rate in the monomer component provided to a polymerization process fully exhibits the effect of this invention, Preferably it is 0-30 mass%, More preferably, it is 0-20 It is mass%, More preferably, it is 0-15 mass%, Especially preferably, it is 0-10 mass%.

Examples of the monomer represented by the general formula (201) include styrene, vinyltoluene,? -Methylstyrene, acrylonitrile, methylvinylketone, ethylene, propylene and vinyl acetate. Or two or more of them may be used in combination. Among these, styrene and (alpha) -methylstyrene are preferable at the point which fully exhibits the effect of this invention.

When using the monomer represented by the said General formula (201), When the content ratio in the monomer component provided to a superposition | polymerization process fully exhibits the effect of this invention, Preferably it is 0-30 mass%, More preferably, Is 0-20 mass%, More preferably, it is 0-15 mass%, Especially preferably, it is 0-10 mass%.

[(Meth) acrylic polymer having a ring structure in the main chain]

It is preferable to have a ring structure in a principal chain also in a (meth) acrylic-type polymer. By introducing a ring structure into the main chain, the rigidity of the main chain can be increased, and heat resistance can be improved.

In the present invention, among the (meth) acrylic polymers having a ring structure in the main chain, a polymer containing a lactone ring structure in the main chain, a polymer having a glutaric anhydride ring structure in the main chain, and a glutalimide ring structure in the main chain It is preferable that it is any of the polymer which has. Especially, it is more preferable that it is a polymer which contains a lactone ring structure in a principal chain.

The polymer which has a ring structure in these main chains below is demonstrated sequentially.

((Meth) acrylic polymer having a lactone ring structure in the main chain)

The (meth) acrylic polymer having a lactone ring structure in the main chain (hereinafter also referred to as a lactone ring-containing polymer) is not particularly limited as long as it is a (meth) acrylic polymer having a lactone ring in the main chain, but preferably the following general formula (401) It has a lactone ring structure represented by).

In general formula (401):

(11)

In General Formula (401), R ⁴⁰¹ , R ⁴⁰² and R ⁴⁰³ each independently represent a hydrogen atom or an organic residue having 1 to 20 carbon atoms, and the organic residue may contain an oxygen atom. The organic residue having 1 to 20 carbon atoms is preferably a methyl group, an ethyl group, an isopropyl group, an n-butyl group or a t-butyl group.

The content rate of the lactone ring structure represented by the said General formula (401) in the structure of a lactone ring containing polymer becomes like this. Preferably it is 5-90 mass%, More preferably, it is 10-70 mass%, More preferably, it is 10- 60 mass%, Especially preferably, it is 10-50 mass%. When the content ratio of the lactone ring structure is 5% by mass or more, the heat resistance and surface hardness of the obtained polymer tend to be improved, and the molding processability of the obtained polymer is improved by setting the content ratio of the lactone ring structure to 90% by mass or less. There is a tendency.

Although it does not specifically limit about the manufacturing method of a lactone ring containing polymer, Preferably, after obtaining the polymer (p) which has a hydroxyl group and an ester group in a molecular chain by a superposition | polymerization process, lactone is obtained by heat-processing the obtained polymer (p). It is obtained by performing the lactone cyclization condensation process which introduces a ring structure into a polymer.

The mass average molecular weight of the lactone ring-containing polymer is preferably 1,000 to 2,000,000, more preferably 5,000 to 1,000,000, still more preferably 10,000 to 500,000, and particularly preferably 50,000 to 500,000.

The lactone ring-containing polymer has a mass reduction rate within the range of 150 to 300 ° C in the dynamic TG measurement, preferably 1% or less, more preferably 0.5% or less, and still more preferably 0.3% or less. As for the method for measuring the dynamic TG, the method described in JP-A-2002-138106 can be used.

Since the lactone ring-containing polymer has a high ring condensation reaction rate, there is little de-alcohol reaction in the manufacturing process of the molded article, and the defect that bubbles or silver bath (silver streaks) are formed in the molded article after the molding due to the alcohol is avoided. Can be. Furthermore, since the lactone ring structure is sufficiently introduced into the polymer by the high ring condensation reaction rate, the obtained lactone ring-containing polymer has high heat resistance.

When the lactone ring-containing polymer is a chloroform solution having a concentration of 15 mass%, the degree of coloration (YI) thereof is preferably 6 or less, more preferably 3 or less, further preferably 2 or less, particularly preferably 1 or less . When coloring degree (YI) is six or less, since the problem of transparency being impaired by coloring hardly arises, it can use preferably in this invention.

As for a lactone ring containing polymer, the 5% mass reduction temperature in thermal mass spectrometry (TG) becomes like this. Preferably it is 330 degreeC or more, More preferably, it is 350 degreeC or more, More preferably, it is 360 degreeC or more.

5% mass reduction temperature in thermal mass spectrometry (TG) is an index of thermal stability, and when it is set to 330 degreeC or more, there exists a tendency for sufficient thermal stability to be exhibited easily. The thermal mass spectrometry can use the said dynamic TG measuring apparatus.

The lactone ring-containing polymer preferably has a glass transition temperature (Tg) of at least 115 ° C, more preferably at least 125 ° C, more preferably at least 130 ° C, particularly preferably at least 135 ° C, and most preferably at least 140 ° C Or more.

The total amount of remaining volatile matter contained in the lactone ring-containing polymer is preferably 5,000 ppm or less, more preferably 2,000 ppm or less, still more preferably 1,500 ppm, particularly preferably 1,000 ppm. If the total amount of the remaining volatile matter is 5,000 ppm or less, molding defects such as coloring, foaming, or silver streak due to deterioration at the time of molding are not preferable, which is preferable.

The lactone ring-containing polymer has a total light transmittance measured by a method according to ASTM-D-1003 for a molded article obtained by injection molding, preferably 85% or more, more preferably 88% or more, and still more preferably 90 It is% or more. Total light transmittance is an index of transparency, and when this is made into 85% or more, there exists a tendency for transparency to improve.

In the case of a polymerization type using a solvent, the polymerization solvent is not particularly limited, and examples thereof include aromatic hydrocarbon solvents such as toluene, xylene and ethylbenzene; Ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone; Ether solvents such as tetrahydrofuran; These may be used alone, or two or more of them may be used in combination.

In addition, in the 1st aspect of the manufacturing method of this invention, since (meth) acrylic-type resin is melt | dissolved in an organic solvent and solution casting is formed, the organic solvent at the time of the synthesis | combination of (meth) acrylic-type resin is melt film forming It does not restrict | limit rather than carrying out, and may synthesize | combine using the high organic solvent of boiling point.

In the case of a polymerization reaction, you may add a polymerization initiator as needed. Although it does not specifically limit as a polymerization initiator, For example, cumene hydroperoxide, diisopropyl benzene hydrooxide, di-t- butyl peroxide, lauroyl peroxide, benzoyl peroxide, t-butyl peroxy isopropyl carbonate organic peroxides such as t-amylperoxy-2-ethylhexanoate; Azo compounds such as 2,2'-azobis (isobutyronitrile), 1,1'-azobis (cyclohexanecarbonitrile) and 2,2'-azobis (2,4-dimethylvaleronitrile); These may be used alone or in combination of two or more. What is necessary is just to set the usage-amount of a polymerization initiator suitably according to the combination of monomers used, reaction conditions, etc., and it is not specifically limited.

The weight average molecular weight of a polymer can be adjusted by adjustment of the quantity of a polymerization initiator.

When performing polymerization, it is preferable to control so that the concentration of the produced | generated polymer in a polymerization reaction mixture may be 50 mass% or less in order to suppress gelation of a reaction liquid. Specifically, when the concentration of the produced polymer in the polymerization reaction mixture exceeds 50% by mass, it is preferable to add the polymerization solvent to the polymerization reaction mixture as appropriate and control it to be 50% by mass or less. The concentration of the produced polymer in the polymerization reaction mixture is more preferably 45% by mass or less, and still more preferably 40% by mass or less.

It does not specifically limit as a form which adds a polymerization solvent suitably to a polymerization reaction mixture, A polymerization solvent may be added continuously and a polymerization solvent may be added intermittently. By controlling the concentration of the polymer produced in the polymerization reaction mixture in this way, the gelation of the reaction solution can be more fully inhibited. As a polymerization solvent to add, the solvent of the same kind as the solvent used at the time of the initial stage of a polymerization reaction may be sufficient, another kind of solvent may be sufficient, and it is preferable to use the same kind of solvent as the solvent used at the time of initial stage of a polymerization reaction. Do. In addition, only 1 type of solvent may be sufficient as the polymerization solvent to add, and 2 or more types of mixed solvent may be sufficient as it.

(Polymer Having Glutarate Anhydrous Ring Structure in Main Chain)

The polymer which has a glutaric anhydride ring structure in a principal chain is a polymer which has a glutaric anhydride unit.

It is preferable that the polymer which has a glutaric anhydride unit has a glutaric anhydride unit (henceforth a glutaric anhydride unit) represented by following General formula (101).

In general formula (101):

[Chemical Formula 12]

In General Formula (101), R ³¹ and R ³² each independently represent a hydrogen atom or an organic residue having 1 to 20 carbon atoms. Moreover, the organic residue may contain the oxygen atom. R ³¹ and R ³² are particularly preferably the same or different and represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

It is preferable that the polymer which has a glutaric anhydride unit is a (meth) acrylic-type polymer containing a glutaric anhydride unit. As a (meth) acrylic-type polymer, it is preferable to have a glass transition temperature (Tg) 120 degreeC or more from a heat resistant point.

As content of the glutaric anhydride unit with respect to a (meth) acrylic-type polymer, 5-50 mass% is preferable, More preferably, it is 10-45 mass%. By setting it as 5 mass% or more, More preferably, it is 10 mass% or more, the effect of heat resistance improvement can be acquired, and also the effect of a weather resistance improvement can also be obtained.

Moreover, it is preferable that the said (meth) acrylic-type copolymer contains the repeating unit further based on unsaturated carboxylic acid alkyl ester. As a repeating unit based on unsaturated carboxylic acid alkyl ester, it is preferable to represent with the following general formula (102), for example.

(102): - [CH ₂ -C (R ⁴¹ ) (COOR ⁴² )] -

In General Formula (102), R ⁴¹ represents hydrogen or an alkyl group having 1 to 5 carbon atoms, and R ⁴² is substituted with an aliphatic or alicyclic hydrocarbon group having 1 to 6 carbon atoms, or a hydroxyl group or halogen having 1 or more carbon atoms or less. An aliphatic or alicyclic hydrocarbon group having 1 to 6 carbon atoms is shown.

The monomer corresponding to the repeating unit represented by General formula (102) is represented by following General formula (103).

(103): CH ₂ = C (R ⁴¹ ) (COOR ⁴² )

As a specific example of such a monomer, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, and (meth) acrylic acid -Hexyl, cyclohexyl (meth) acrylate, chloromethyl (meth) acrylate, 2-chloroethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropropropyl (meth) acrylate, (meth ) Acrylic acid 2,3,4,5,6-pentahydroxyhexyl and (meth) acrylic acid 2,3,4,5-tetrahydroxypentyl and the like, and methyl methacrylate is most preferably used. do. These may be used individually by 1 type, or may use 2 or more types together.

As for content of the unsaturated carboxylic acid alkyl ester unit with respect to said (meth) acrylic-type polymer, 50-95 mass% is preferable, More preferably, it is 55-90 mass%. The (meth) acrylic polymer having a glutaric anhydride unit and an unsaturated carboxylic acid alkyl ester-based unit is, for example, by polymerizing and cyclizing a copolymer having an unsaturated carboxylic acid alkyl ester-based unit and an unsaturated carboxylic acid unit. You can get it.

The unsaturated carboxylic acid unit is preferably represented by, for example, the following general formula (104).

(104): - [CH ₂ -C (R ⁵¹ ) (COOH)] -

R ⁵¹ represents hydrogen or an alkyl group having 1 to 5 carbon atoms.

As a preferable specific example of the monomer which guide | induces an unsaturated carboxylic acid unit, the compound represented by following General formula (105) which is a monomer corresponding to the repeating unit represented by General formula (104), and maleic acid, and also maleic anhydride Although hydrolyzate etc. are mentioned, Acrylic acid and methacrylic acid are preferable at the point which is excellent in thermal stability, More preferably, it is methacrylic acid.

(105): CH ₂ = C (R ⁵¹ ) (COOH)

These may be used individually by 1 type, or may use 2 or more types together. As described above, the acrylic thermoplastic copolymer having glutaric anhydride units and unsaturated carboxylic acid alkyl ester units polymerizes copolymers having, for example, unsaturated carboxylic acid alkyl ester units and unsaturated carboxylic acid units. Since it is obtained by cyclization, you may have unsaturated carboxylic acid unit in the structural unit.

As content of the unsaturated carboxylic acid unit with respect to said (meth) acrylic-type polymer, 10 mass% or less is preferable, More preferably, it is 5 mass% or less. By setting it as 10 mass% or less, the fall of colorless transparency and retention stability can be prevented.

Moreover, the said (meth) acrylic-type polymer may have the other vinylic monomer unit which does not contain an aromatic ring in the range which does not impair the effect of this invention. Specific examples of other vinyl monomer units containing no aromatic ring include vinyl cyanide monomers such as acrylonitrile, methacrylonitrile, and ethacrylonitrile; Allyl glycidyl ether; Maleic anhydride and itaconic anhydride; N-methylmaleimide, N-ethylmaleimide, N-cyclohexylmaleimide, acrylamide, methacrylamide, N-methylacrylamide, butoxymethylacrylamide, N-propylmethacrylamide; Aminoethyl acrylate, propylaminoethyl methacrylate, dimethylaminoethyl methacrylate, ethylaminopropyl methacrylate, cyclohexylaminoethyl methacrylate; N-vinyldiethylamine, N-acetylvinylamine, allylamine, methallyl amine, N-methylallylamine; Oxazoline, 2-isopropenyl-oxazoline, 2-vinyl-oxazoline, 2-acyl-oxazoline and the like. These may be used individually by 1 type and may use 2 or more types together.

As content of the other vinylic monomer unit which does not contain an aromatic ring with respect to said (meth) acrylic-type polymer, 35 mass% or less is preferable.

Moreover, it is abrasion resistance about the vinyl-type monomeric unit (N-phenylmaleimide, phenyl amino ethyl methacrylate, p-glycidyl styrene, p-amino styrene, 2-styryl- oxazoline etc.) containing an aromatic ring. Since there exists a tendency to reduce weather resistance, it is preferable to set it as 1 mass% or less as content with respect to the said (meth) acrylic-type polymer.

((Meth) acrylic polymer having a glutalimide ring structure in the main chain)

The (meth) acrylic polymer having a glutalimide ring structure in the main chain (hereinafter also referred to as a glutalimide resin) is preferable in terms of optical properties, heat resistance, etc. by having a glutalimide ring structure in the main chain. The characteristic balance can be expressed. The (meth) acrylic polymer having a glutalimide ring structure in the main chain is at least the following General Formula (301):

General Formula (301)

[Chemical Formula 13]

20 mass% or more of the glutalimide unit (wherein, R <^301> , R <^302> and R <^303> is hydrogen or a C1-C12 unsubstituted or substituted alkyl group, a cycloalkyl group, and an aryl group) independently. It is preferable to contain the glutalimide resin which has.

As a preferable glutalimide unit which comprises glutalimide-type resin used for this invention, R ³⁰¹ and R ³⁰² are hydrogen or a methyl group, R ³⁰³ This is a methyl group or a cyclohexyl group. The glutalimide unit may be a single kind, or may be R ³⁰¹ , R ³⁰² , or R ^303. You may contain these different several types.

As a preferable 2nd structural unit which comprises glutalimide-type resin used for this invention, it is a unit which consists of acrylate ester or methacrylic acid ester. Preferable acrylic acid ester or methacrylic acid ester structural units include methyl acrylate, ethyl acrylate, methyl methacrylate, methyl methacrylate and the like. Moreover, N-alkyl methacrylamide, such as N-methyl methacrylamide and N-ethyl methacrylamide, is mentioned as another preferable imidation unit. These 2nd structural units may be individual types, and may contain several types.

Content of the glutalimide unit represented by General formula (301) of glutalimide-type resin is 20 mass% or more on the basis of the total repeating unit of glutalimide-type resin. Preferable content of a glutalimide unit is 20 mass%-95 mass%, More preferably, it is 50-90 mass%, More preferably, it is 60-80 mass%. When a glutalimide unit is smaller than this range, the heat resistance of the film obtained may be inadequate or transparency may be impaired. Moreover, when exceeding this range, a heat resistance will be raised unnecessarily and it becomes difficult to form a film, the mechanical strength of the film obtained will become extremely weak, and transparency may be impaired.

As needed, the third structural unit may be copolymerized with glutalimide-based resin. Examples of preferred third structural units include styrene monomers such as styrene, substituted styrene and α-methylstyrene, acrylic monomers such as butyl acrylate, nitrile monomers such as acrylonitrile and methacrylonitrile, maleimide, Structural units formed by copolymerizing maleimide monomers such as N-methylmaleimide, N-phenylmaleimide and N-cyclohexylmaleimide can be used. These may be copolymerized directly with the glutalimide unit and the unit which can be imidized in glutalimide-type resin, and may be graft-copolymerized with respect to resin which has the glutalimide unit and the unit which can be imidated. . When a 3rd component adds this, it is preferable that content rate in glutalimide-type resin is 5 mol% or more and 30 mol% or less based on the total repeating unit in glutalimide-type resin.

Glutalimide-based resins are described in U.S. Patent No. 3284425, U.S. Patent No. 4246374, JP-A 2-153904 and the like, and are resins having an imidizable unit. By using resin obtained, the resin which has the imidable unit can be obtained by imidating using ammonia or a substituted amine. When obtaining glutarimide-type resin, the unit comprised from acrylic acid, methacrylic acid, or its anhydride may be introduce | transduced into glutalimide-type resin as a reaction by-product. Since the presence of such a structural unit, especially an acid anhydride, reduces the total light transmittance and haze of the film of this invention obtained, it is not preferable. The content of acrylic acid or methacrylic acid is preferably 0.5 milliequivalent or less, preferably 0.3 milliequivalent or less, and more preferably 0.1 milliequency or less, per 1 g of the resin. Moreover, as shown in Unexamined-Japanese-Patent No. 02-153904, it is also possible to obtain glutalimide-type resin by imidating using resin mainly consisting of N-methyl acrylamide and methacrylic acid methyl ester.

Moreover, it is preferable that glutal imide resin has a weight average molecular weight of 1 * 10 <^4> -5 * 10 <^5> .

<Ultraviolet absorber>

The ultraviolet absorber used preferably for the said base film is demonstrated. Although the optical film of this invention containing the said base film is used for a polarizing plate or a member for liquid crystal displays, etc., a ultraviolet absorber is used preferably from a viewpoint of prevention of deterioration, such as a polarizing plate or a liquid crystal. As a ultraviolet absorber, the thing which is excellent in the absorption ability of the ultraviolet-ray of wavelength 370nm or less, and has the low absorption of the visible light of wavelength 400nm or more from a viewpoint of favorable liquid crystal display property is used preferably. 1 type of ultraviolet absorbers may be used and may use 2 or more types together. For example, the ultraviolet absorber of Unexamined-Japanese-Patent No. 2001-72782 and Unexamined-Japanese-Patent No. 2002-543265 is mentioned. As an example of a ultraviolet absorber, an oxybenzophenone type compound, a benzotriazole type compound, a salicylic acid ester type compound, a benzophenone type compound, a cyanoacrylate type compound, a nickel complex salt type compound, etc. are mentioned, for example.

Among them, preferred are 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) -5-chlorobenzotriazole Sol, 2- (2'-hydroxy-3'- (3 ", 4", 5 ", 6" -tetrahydrophthalimidemethyl) -5'-methylphenyl) benzotriazole, 2,2- Bis (4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol) 2- (2'- 5'-methylphenyl) -5-chlorobenzotriazole, 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy- (2-methoxy-4-hydroxy-5-benzoylphenylmethane), (2,4-bis- (n-octylthio) -6- Di-tert-butyl anilino) -1,3,5-triazine, 2 (2'-hydroxy-3 ', 5'- 2'-hydroxyl Ci-3 ', 5'-di-tert-amylphenyl) -5-chlorbenzotriazole, 2,6-di-tert-butyl-p-cresol, pentaerythryl-tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate], triethylene glycol-bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 1 , 6-hexanediol-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 2,4-bis- (n-octylthio) -6- (4- Hydroxy-3,5-di-tert-butylanilino) -1,3,5-triazine, 2,2-thio-diethylenebis [3- (3,5-di-tert-butyl-4- Hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, N, N'-hexamethylenebis (3,5-di- tert-butyl-4-hydroxy-hydrocinamide), 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, tris- (3,5-di-tert-butyl-4-hydroxybenzyl) -isocyanurate etc. are mentioned. Especially (2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di-tert-butylanilino) -1,3,5-triazine, 2 (2'- Hydroxy-3 ', 5'-di-tert-butylphenyl) -5-chlorbenzotriazole, (2 (2'-hydroxy-3', 5'-di-tert-amylphenyl) -5-chlor Benzotriazole, 2,6-di-tert-butyl-p-cresol, pentaerythryl-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], Triethylene glycol-bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate] is preferred, for example, N, N'-bis [3- (3, You may use together hydrazine type metal deactivators, such as 5-di-tert- butyl- 4-hydroxyphenyl) propionyl] hydrazine, and phosphorus process stabilizers, such as tris (2, 4- di-tert- butylphenyl) phosphite.

A ultraviolet absorber can also be introduce | transduced into resin as a structural unit which has ultraviolet absorbing power. For example, it is a benzotriazole derivative, triazine derivative, or benzophenone derivative which introduce | transduced a polymeric group. The polymeric group to introduce | transduce can be suitably selected according to the structural unit which resin has.

Specific examples of the monomer having ultraviolet absorbing ability include 2- (2'-hydroxy-5'-methacryloyloxy) ethylphenyl-2H-benzotriazole (manufactured by Otsuka Chemical, trade name RUVA-93), 2- ( 2'-hydroxy-5'-methacryloyloxy) phenyl-2H-benzotriazole, 2- (2'-hydroxy-3'-t-butyl-5'-methacryloyloxy) phenyl- 2H-benzotriazole.

(Other additives)

Additives, such as a mat agent, a retardation expression agent, a plasticizer, a ultraviolet absorber, a deterioration inhibitor, a peeling agent, an infrared absorber, and a wavelength-dispersion regulator, can be added to the said base film, They may be solid or oily substance may be sufficient as them. That is, it is not specifically limited in the melting point or boiling point. For example, a mixture of an ultraviolet absorbing material of 20 占 폚 or lower and an ultraviolet absorbing material of 20 占 폚 or more, or a mixture of a plasticizer and the like, and is described in, for example, Japanese Patent Laid-Open Publication No. 2001-151901. Moreover, as an infrared absorbing dye, it is described, for example in Unexamined-Japanese-Patent No. 2001-194522. In addition, although the addition time may be added at any time in a dope manufacturing process, you may add and implement the process of adding and preparing an additive to the last preparation process of a dope preparation process. Moreover, the addition amount of each raw material is not specifically limited as long as a function is expressed. In the case where the optical film is formed in a multilayer structure, the kinds and addition amounts of the additives in the respective layers may be different. For example, in Japanese Laid-Open Patent Publication No. 2001-151902 and the like, which are conventionally known technologies. For these details, the materials described in detail on pages 16 to 22 in the Invention Association Publication (Publication No. 2001-1745, published March 15, 2001, Invention Association) are preferably used.

Moreover, you may contain rubbery particle | grains in the said base film. For example, acryl particles, such as a soft acrylic resin, an acrylic rubber, and a rubber-acrylic-grafted core-shell polymer, or a styrene-elastomer copolymer are mentioned. In addition, additives for improving impact resistance and stress whitening properties described in JP-A-60-17406, JP-A 3-39095 and the like are also preferably used.

In the said base film, when adding these additives, it is preferable that it is 50 mass% or less with respect to a base film, and it is preferable that it is 30 mass% or less with respect to a base film.

By these additives, the brittleness of the film is improved, and the fracture test (such as crack evaluation when bending at 180 degrees) of the film is greatly improved.

In addition, in order to achieve low haze, it is preferable that the refractive index of the said additive has substantially the same refractive index as a base polymer, 0.5 or less is preferable and, as for the refractive index difference, 0.3 or less are more preferable.

&Lt; Characteristics of base film &

(Retardation)

It is preferable that Re and Rth (defined by following formula (I ') and (II')) measured at the wavelength of 590 nm of the said base film satisfy | fill Formula (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 formulas (I ') to (IV'), nx is a refractive index in the slow axis direction in the film plane of the base film, ny is a refractive index in the fast axis direction in the film plane of the base film, and nz is the base film Is the refractive index of the film thickness direction of, and d is the thickness (nm) of the base film.)

Moreover, in the said base film, although said Formula (III ') and (IV') should just satisfy | fill at least 1 point in a film plane, said Formula (III ') and (IV') are satisfying at arbitrary points in a film plane. It is desirable to be.

In this specification, Re, Rth, and Nz in wavelength (lambda) nm can be measured as follows.

Re is measured by injecting light having a wavelength of λ nm in the film normal line direction in KOBRA 21 ADH (manufactured by Oji Measurement Instruments Co., Ltd.).

Rth is the retardation value measured by making the said Re, in-plane slow axis (determined by KOBRA 21ADH) as an inclination axis (rotation axis), injecting light of wavelength λnm in the + 40 ° inclination direction with respect to the film normal direction, and KOBRA 21ADH based on the retardation value measured in a total of 3 directions of the retardation value measured by injecting light having a wavelength of λ nm in a direction inclined at -40 ° to the film normal direction with the in-plane slow axis as the tilt axis (rotation axis). Calculate by Here, the assumption of the average refractive index may be a value of a catalog of polymer handbooks (JOHN WILEY & SONS, INC) and various optical films. The thing which does not know the value of an average refractive index in advance can be measured with an Abbe refractometer. The value of the average refractive index of the main optical film is illustrated below: cellulose acylate (1.48), cycloolefin polymer (1.52), polycarbonate (1.59), polymethylmethacrylate (1.49), polystyrene (1.59).

In the measurement of the said base film, when the said thermoplastic resin used for the said base film is a cellulose ester, the retardation is measured by making the average refractive index of the said base film as 1.48.

Re, Rth is a kind of the thermoplastic resin used in the base film (when the thermoplastic resin used in the base film is a cellulose ester, D (substitution degree of the cellulose ester), the thermoplastic resin and the additive It can adjust with quantity, addition of a retardation expression agent, the film thickness of a film, the extending | stretching direction and elongation rate of a film, etc.

(Thickness of base film)

5-100 micrometers is preferable, as for the film thickness of the said base film, 10-80 micrometers is more preferable, 15-70 micrometers is especially preferable, 20-60 micrometers is still more especially preferable. By controlling the film thickness within the above range, it is possible to reduce the nonuniformity of the panel due to the environment in which the liquid crystal display device is placed, that is, the change in temperature and humidity, after the low moisture-permeable layer is laminated.

(Moisture permeability of base film)

The water vapor transmission rate of the said base film is measured on 40 degreeC and the conditions of 90% of a relative humidity based on JISZ-0208.

The moisture permeability of the base film is preferably not more than 300 g / m 2 / day, more preferably not more than 250 g / m 2 / day, more preferably not more than 200 g / m 2 / day, more preferably not more than 150 g / desirable. By controlling the moisture permeability of the base film in the above range, the warpage of the liquid crystal cell after the normal temperature, high humidity, and high temperature and high humidity environment time elapsed of the liquid crystal display device equipped with the optical film (optical film of the present invention) on which the low moisture vapor transmission layer is laminated, Uneven display at the time of black display can be suppressed.

(Moisture permeability per unit film thickness of base film)

As described in (Water vapor transmission rate per unit film thickness) of the low moisture-permeable layer, the water vapor transmission rate is imparted 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.)

50-2000 g / m <2> / day is preferable, as for the water vapor transmission rate with respect to the film thickness of a base film, 10-80 g / m <2> / day is more preferable, 100-1000 g / m <2> / day is more preferable, 150-800 g / m <2> / day is especially preferable. (The moisture permeability is the method after 24 hours passed at 40 degreeC and 90% of a relative humidity by the method of JIS0208.)

Further, the base film and the film having a thickness of 10 ㎛ of the low moisture-permeable layer moisture permeability _{C b (10 ㎛) / C} s (10 ㎛) is preferably 1.5 to 30, more preferably 2-20, and 3-10 Is particularly preferred.

A sufficient low moisture permeation effect can be obtained at a lower limit value or more and curl can be suppressed at an upper limit value or lower.

(Oxygen Permeability Coefficient of Base Film)

In order to reduce the water vapor transmission rate, it is preferable to suppress the diffusion of water in the film, that is, to lower the free volume of the film. In general, the free volume of the film is correlated with the oxygen transmission coefficient of the film.

The oxygen transmission 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.

In addition, the oxygen transmission coefficient of a base film can be measured by the following method.

<Method of Measuring Oxygen Transmission Coefficient>

Oxygen permeation amount measurement of the film is affixed the test piece cut | disconnected to diameter 1.5cm through the silicone glyze apply | coated thinly to the oxygen electrode (Obisfair Laboratories make MODEL3600, PFA), and oxygen reduction in a normal state Oxygen permeation amount was calculated | required from the electric current output value.

The conversion of the output current value into the oxygen transmission amount was determined by creating a calibration curve using a sample in which the transmission amount was known in advance. The measurement was performed in 25 degreeC 50% RH environment.

(Haze of base film)

It is preferable that all the haze values of the said base film are 2.00% or less. When the total haze value is 2.00% or less, the transparency of the film is high, and it is effective for improving the contrast ratio and luminance of the liquid crystal display device. The total haze value is more preferably 1.00% or less, still more preferably 0.50% or less, particularly preferably 0.30% or less, and most preferably 0.20% or less. The lower the total haze value is, the better the optical performance is, but in consideration of raw material selection, manufacturing control, and handling property of the roll film, it is preferably 0.01% or more.

It is preferable that the internal haze value of the said base film is 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, still more preferably 0.20% or less, particularly preferably 0.10% or less, and most preferably 0.05% or less. It is preferable that it is 0.01% or more from a viewpoint of raw material selection, manufacture control, etc.

As said base film, it is especially preferable that all the haze value is 0.30% or less, and internal haze value is 0.10% or less.

The total haze value and the internal haze value depend on the type and amount of the film material, the choice of additives (particularly the particle size, refractive index, and amount of the particles of the mat agent), and furthermore, on the film production conditions (temperature and draw ratio at the time of stretching). Can be adjusted by

In addition, the measurement of haze can measure a 40 mm x 80 mm film sample with a haze meter (HGM-2DP, Suga tester) at 25 degreeC and 60% of a relative humidity, according to JISK-6714.

(Elastic modulus of base film)

It is preferable that the elasticity modulus of the said base film is 1800-7000 Mpa in the width direction (TD direction).

In this invention, by making the elasticity modulus of a TD direction into the said range, manufacturing aptitudes, such as display nonuniformity at the time of the black display after time-lapse of high humidity and high temperature, high humidity environment, conveyance at the time of film manufacture, an edge slit, or not breaking easily, etc. It is preferable from a viewpoint. If the TD modulus is too small, the display unevenness at the time of black display after elapse of time of high humidity and high temperature and high humidity environment tends to occur, and there is a problem in the aptitude for manufacturing. If the TD modulus is too large, the film workability is inferior. 5000 MPa is more preferable, and it is still more preferable that they are 1800-4000 MPa.

Moreover, 1800-4000 Mpa is preferable and, as for the elasticity modulus of (MD direction) of the conveyance direction of the said base film, it is more preferable that it is 1800-3000 Mpa.

Here, the conveyance direction (length direction) of a film is a conveyance direction (MD direction) at the time of film manufacture, and a width direction is a direction (TD direction) perpendicular | vertical to the conveyance direction at the time of film manufacture.

The elastic modulus of the film can be adjusted by the type and amount of the thermoplastic resin of the base film material, the selection of the additives (particularly the particle size of the particles of the mat agent, the refractive index, the addition amount), and furthermore, the film production conditions (the stretching ratio, etc.). .

For example, the modulus of elasticity is measured by using a universal tensile tester "STM T50BP" manufactured by Toyo Baldwin Co., Ltd., at 0.5% elongation at a tensile rate of 10% / min in a 23 ° C and 70 RH% atmosphere. You can get it.

(Glass Transition Temperature Tg of Base Film)

From the viewpoint of production suitability and heat resistance, the glass transition temperature Tg of the base film is preferably 100 ° C or more and 200 ° C or less, and more preferably 100 ° C or more and 150 ° C or less.

The glass transition temperature is determined by using a differential scanning calorimeter (DSC) at a temperature rise rate of 10 ° C./min, when the baseline originating from the glass transition of the film begins to change and the temperature returns to the baseline again. It can obtain | require as an average value.

In addition, the measurement of glass transition temperature can also be calculated | required using the following dynamic viscoelasticity measuring apparatus. The film sample (non-stretched) was wetted at 25 ° C. 60% RH for 2 hours or more after 5 mm × 30 mm, and then, with a dynamic viscoelasticity measuring device (Vibron: DVA-225 (manufactured by Haiti Measurement Control Co., Ltd.)), I) measured at a distance of 20 mm, a temperature increase rate of 2 ° C./min, a measurement temperature range of 30 ° C. to 250 ° C., and a frequency of 1 Hz, and taking temperature (° C.) as a logarithmic axis on the vertical axis and a linear axis on the horizontal axis; The intersection of the straight line 1 and the straight line 2 when the straight line 1 is drawn in the solid region and the straight line 2 is drawn in the glass transition region is shown to drastically decrease the storage modulus when the storage modulus transitions from the solid region to the glass transition region. It is set as glass transition temperature Tg (dynamic viscoelasticity) because it is temperature which starts to move to a glass transition area to the temperature at which a storage elastic modulus decreases rapidly and a film starts to soften at the time.

Knoop hardness of the base film

In the polarizing plate protective film used for an outermost surface, it is preferable that surface hardness is high, and in that case, it is preferable that Knob hardness is high as a characteristic of a base film. The Knoop hardness is preferably 100 N / mm 2 or more, and more preferably 150 N / mm 2 or more.

In addition, the Knock hardness of a base film can be measured by the following method.

<Measurement of surface hardness>

Using Fischer Instruments Co., Ltd. "Fischer Scope H100Vp-type hardness tester", the direction of the short axis of the indenter is parallel to the conveying direction (length direction; test direction in the pencil hardness test) during cellulose acylate film forming The placed nipper indenter measured the sample surface fixed to the glass substrate on the conditions of 10 sec load time, 5 sec creep time, 10 sec unloading time, and 100 mN maximum load. The hardness was calculated from the relationship between the contact area between the indenter and the sample determined from the indentation depth and the maximum load, and the average value of these five points was defined as the surface hardness.

(Equilibrium moisture content of substrate film)

The moisture content (equilibrium moisture content) of the said base film is 25 degreeC and 80% of a relative humidity, regardless of a film thickness, in order not to impair the adhesiveness with water-soluble thermoplastics, such as polyvinyl alcohol, when using as a protective film of a polarizing plate. It is preferable that the moisture content in 0 is 4-4 mass%. It is more preferable that it is 0-2.5 mass%, and it is still more preferable that it is 0-1.5 mass%. When equilibrium moisture content is 4 mass% or less, the dependence by the humidity change of retardation does not become large too much, and also it is preferable at the point which suppresses the display nonuniformity at the time of black display after time-lapse of normal temperature, high humidity, and high temperature, high humidity environment of a liquid crystal display device.

The measurement method of the water content measured 7 mm x 35 mm of film samples by the Karl Fischer method with a moisture meter, sample drying apparatus "CA-03", and "VA-05" (all are manufactured by Mitsubishi Chemical Corporation). It can calculate by dividing the moisture content g by the sample mass g.

(Dimension change of base film)

Dimensional stability of the said base film is 60 degreeC, when it is left to stand on the conditions of 90% of relative humidity for 24 hours (high humidity), and the dimension change rate of 80 degreeC, and the conditions of DRY environment (relative humidity 5% or less) It is preferable that all the dimensional change rates of (high temperature) are made into 0.5% or less when left to stand for 24 hours. More preferably, it is 0.3% or less, More preferably, it is 0.15% or less.

(Photoelastic coefficient of base film)

When the optical film of this invention is used as a protective film for polarizing plates, birefringence (Re, Rth) may change by stress etc. by shrinkage of a polarizer. The change in birefringence due to such stress can be measured as the photoelastic coefficient, but the elastic modulus of the base film is preferably 15 Br or less, more preferably -3 to 12 Br, still more preferably 0 to 11 Br.

<Method for producing base film>

Hereinafter, the manufacturing method which forms the thermoplastic resin which has the (meth) acrylic-type polymer used for this invention as a main component is demonstrated in detail.

In order to form a base film using a (meth) acrylic-based polymer as a main component, for example, the resulting mixture is preblended with a conventionally known mixer such as an omni mixer, and then the resulting mixture is subjected to extrusion kneading. In this case, the mixer used for the extrusion kneading is not particularly limited, and conventionally known mixers such as an extruder such as a single-screw extruder, a twin-screw extruder, or a pressurized kneader can be used.

As a method of film shaping | molding, a conventionally well-known film shaping | molding method, such as the solution casting method (solution casting method), the melt extrusion method, the calender method, the compression molding method, is mentioned, for example. Of these film forming methods, the melt extrusion method is particularly preferable.

Examples of the melt extrusion method include a T-die method, an inflation method, and the like. The molding temperature may be appropriately adjusted according to the glass transition temperature of the film raw material, and is not particularly limited. Preferably it is 150 degreeC-350 degreeC, More preferably, it is 200 degreeC-300 degreeC.

When film-forming by the T-die method, a T die is attached to the front-end | tip of a well-known single screw extruder or a twin screw extruder, the film extruded to the film form can be wound up, and a roll-shaped film can be obtained. At this time, it is also possible to uniaxially stretch by adjusting the temperature of a roll roll suitably and extending | stretching in an extrusion direction. Simultaneous biaxial stretching, sequential biaxial stretching, and the like can also be performed by stretching the film in a direction perpendicular to the extrusion direction.

The base film which has a (meth) acrylic-type polymer as a main component may be either an unstretched film or a stretched film. In the case of a stretched film, either a monoaxially stretched film or a biaxially stretched film may be used. In the case of a biaxially oriented film, either a simultaneous biaxially oriented film or a sequential biaxially oriented film may be used. In the case of biaxially stretching, the mechanical strength is improved and the film performance is improved. In the case where the (meth) acrylic polymer is a (meth) acrylic polymer having a cyclic structure in the main chain described above, by mixing other thermoplastic resins, an increase in retardation can be suppressed even when stretching, and the film maintains optical isotropy. Can be obtained.

It is preferable that extending | stretching temperature is the glass transition temperature vicinity of the (meth) acrylic-type polymer which is a film raw material, Specifically, Preferably it is (glass transition temperature -30 degreeC)-(glass transition temperature +100 degreeC), More preferably, It exists in the range of (glass transition temperature-20 degreeC)-(glass transition temperature +80 degreeC). When extending | stretching temperature is less than (glass transition temperature-30 degreeC), sufficient draw ratio may not be obtained. On the contrary, when extending | stretching temperature exceeds (glass transition temperature +100 degreeC), the flow (flow) of a (meth) acrylic-type polymer may arise and it may become impossible to perform stable extending | stretching.

The draw ratio is preferably 1.1 to 25 times, more preferably 5.0 to 20 times, and 8 to 15 times in area ratio. If the draw ratio is less than 1.1 times, it may not lead to the improvement of the toughness caused by the draw. On the contrary, when a draw ratio exceeds 25 times, the effect of raising draw ratio may not be recognized. Moreover, when a draw ratio is 5 times or more, moisture permeability may fall in addition to toughness improvement, and it is more preferable in this invention.

The stretching speed is in one direction, preferably in the range of 10 to 20,000% / min, more preferably in the range of 100 to 10,000% / min. When the stretching speed is less than 10% / min, it takes time to obtain a sufficient stretching ratio, and thus the manufacturing cost may increase. On the contrary, when the stretching speed exceeds 20,000% / min, breakage of the stretched film may occur.

Moreover, in order to stabilize the optical isotropy and a mechanical characteristic, the base film obtained using a (meth) acrylic-type polymer as a main component can be heat-processed (annealed) etc. after an extending | stretching process. What is necessary is just to select conditions of heat processing suitably similarly to the conditions of the heat processing performed with respect to a conventionally well-known stretched film, and are not specifically limited.

Preferably the thickness of the base film obtained by making a (meth) acrylic-type polymer as a main component is 5 micrometers-200 micrometers, More preferably, they are 10 micrometers-100 micrometers. When thickness is less than 5 micrometers, not only the intensity | strength of a film falls but a crimp may become large when sticking to another component and carrying out a durability test. On the contrary, when thickness exceeds 200 micrometers, not only transparency of a film falls but also moisture permeability becomes small, and when the water-based adhesive agent is used at the time of sticking to another component, the drying speed of the water which is the solvent may become low.

(Surface treatment)

By performing surface treatment as the case may be, the base film can achieve the improvement of 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). For example, glow discharge treatment, ultraviolet irradiation treatment, corona treatment, flame treatment, acid or alkali treatment can be used. The glow discharge process referred to herein may be a low temperature plasma occurring under a low pressure gas of 10 &lt; ^-3 &gt; to 20 Torr, or plasma treatment under atmospheric pressure is also preferable. The plasma-excited gas refers to a gas that is plasma-excited under the above conditions, and examples thereof include argon, helium, neon, krypton, xenon, nitrogen, carbon dioxide, freons such as tetrafluoromethane, and mixtures thereof. The details are described in detail in pages 30 to 32 of the Invention Association Publication (Publication No. 2001-1745, issued March 15, 2001, Invention Association), and can be preferably used in the present invention. .

{Functional layer}

Moreover, although the optical film of this invention has the said low moisture-permeable layer, you may further laminate | stack a functional layer on at least one surface. Although the kind of this functional layer is not specifically limited, A hard coat layer, an antireflection layer (layer which adjusted refractive index, such as a low refractive index layer, a medium refractive index layer, and a high refractive index layer), an anti-glare layer, an antistatic layer, an ultraviolet absorbing layer, etc. are mentioned. .

One layer may be sufficient as the said functional layer, and multiple layers may be formed. Although the lamination | stacking method of the said functional layer is not specifically limited, It is preferable to apply | coat and form another functional layer further on the optical film of this invention after laminating | stacking a low moisture-permeable layer.

You may laminate | stack a functional layer on the surface in which the low moisture-permeable layer of the base film was formed. In this case, the functional layer may or may not be in contact with the low moisture permeable layer. Moreover, you may laminate | stack on the surface which has not laminated | stacked the low moisture-permeable layer. When laminating a plurality of functional layers, one functional layer may be laminated on the low moisture-permeable layer, and another functional layer may be laminated | stacked on the surface in which the low moisture-permeable layer is not laminated | stacked.

[Layer Composition of Optical Film]

It is preferable that the optical film of this invention has a low moisture-permeable layer on one surface of a base film, and is a polarizing plate protective film and a surface film of a liquid crystal display device. When the optical film of this invention is a surface film, it is preferable that the hard-coat layer is laminated | stacked. The preferable layer structure in this case is shown below.

Base film / low moisture permeable layer / hard coat layer

Base film / hard coat layer / low moisture vapor transmission layer

Low Moisture-Proof Layer / Base Film / Hard Coat Layer

Base film / low moisture permeable layer / hard coat layer / antireflection layer

Base film / hard coat layer / low moisture permeable layer / antireflection layer

Low moisture barrier layer / base film / hard coat layer / antireflection layer

Base film / low moisture permeable layer / hard coat layer / antireflection layer / antifouling layer

[Hard Coat Layer]

As mentioned above, it is also preferable to form a hard-coat layer in the optical film of this invention as a functional layer.

In the present invention, the hard coat layer refers to a layer in which the pencil hardness of the transparent support increases by forming the layer. Practically, pencil hardness (JIS K5400) after hard-coat layer lamination is preferably H or more, more preferably 2H or more, and most preferably 3H or more.

The thickness of the hard coat layer is preferably 0.4 to 35 mu m, more preferably 1 to 30 mu m, and most preferably 1.5 to 20 mu m.

In the present invention, the hard coat layer may be a single layer or a plurality of hard coat layers. When the hard coat layer has a plurality of layers, it is preferable that the sum of the film thicknesses 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 or may have irregularities. If necessary, the hard coat layer may contain light-transmitting particles in order to provide surface irregularities and internal scattering.

[Material for forming a hard coat layer]

In the present invention, the hard coat layer is coated and dried with a compound containing an unsaturated double bond, a polymerization initiator, a translucent particle, a fluorine-containing or silicon-based compound, and a solvent, if necessary, directly or through another layer on a support. It can form by hardening. Each component is demonstrated below.

[Compound having an unsaturated double bond]

The composition for forming a hard coat layer of the present invention may 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 polymerizable unsaturated groups. The polyfunctional monomer which has 2 or more of this polymerizable unsaturated groups can function as a hardening | curing agent, and it becomes possible to improve the strength and scratch resistance of a coating film. As for a polymerizable unsaturated group, it is more preferable that it is three or more. These monomers can also be used together using a monofunctional or bifunctional monomer and a trifunctional or more than trifunctional monomer.

Examples of the compound having an unsaturated double bond include compounds having a polymerizable functional group such as a (meth) acryloyl group, a vinyl group, a styryl group, and an allyl group, and among them, a (meth) acryloyl group and a -C O) is OCH = CH ₂ are preferred. Especially preferably, the compound containing three or more (meth) acryloyl groups in the following 1 molecule can be used.

As a specific example of a compound which has a polymerizable unsaturated bond, (meth) acrylic acid diester of alkylene glycol, the (meth) acrylic acid diester of polyoxyalkylene glycol, the (meth) acrylic acid diester of polyhydric alcohol, (Meth) acrylic acid diesters of ethylene oxide or propylene oxide adducts, epoxy (meth) acrylates, urethane (meth) acrylates, polyester (meth) acrylates, and the like.

Especially, ester of polyhydric alcohol and (meth) acrylic acid is 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 phosphoric acid tri (meth) acrylate, trimethylolethane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol tetra (meth) Acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,2,3-cyclohexanetetramethacrylate, polyurethane polyacrylic It can be given site, polyester acrylate, caprolactone-modified tris (acryloxyethyl) isocyanurate and the like.

As the polyfunctional acrylate compound having a (meth) acryloyl group, a commercially available one may be used, and NK ester A-TMMT manufactured by Shin-Nakamura Chemical Industry Co., Ltd., KAYARAD DPHA manufactured by Nippon Gunpowder Co., Ltd., etc. may be used. Can be mentioned. The polyfunctional monomer is described in paragraphs [0114] to [0122] of JP2009-98658A and the same in the present invention.

The compound having an unsaturated double bond is preferably a compound having a hydrogen bondable substituent in view of adhesion to a support, low curl, and fixing property of a fluorine-containing or silicone-based compound described later. The hydrogen bondable substituent refers to a substituent in which an electronegative atom such as nitrogen, oxygen, sulfur, or halogen and a hydrogen bond are covalently formed, and specifically, OH-, SH-, -NH-, and CHO-. , CHN- and the like, and urethane (meth) acrylates and (meth) acrylates having a hydroxyl group are preferable. The polyfunctional acrylate which has a commercially available (meth) acryloyl group can also be used, and the NK oligo U4HA, the copper NK ester A-TMM-3, the Nippon Gunpowder Co., Ltd. product made by Shin-Nakamura Chemical Industry Co., Ltd. make KAYARAD PET-30 etc. are mentioned.

Content of the compound which has an unsaturated double bond in the composition for hard-coat layer formation of this invention is 50 with respect to the total solid except the inorganic component in the composition for hard-coat layer formation in order to provide sufficient polymerization rate and to provide hardness etc. Mass% or more is preferable, 60-99 mass% is more preferable, 70-99 mass% is more preferable, 80-99 mass% is especially preferable.

In this invention, it is also preferable to use the compound which has a cyclic aliphatic hydrocarbon and unsaturated double bond group in a molecule | numerator for the composition for hard-coat layer formation. By using such a compound, a low moisture permeability can be imparted to the hard coat layer. In order to improve hard coat property, it is more preferable to use the compound which has 2 or more of a cyclic aliphatic hydrocarbon and unsaturated double bond group in a molecule | numerator.

When the composition for forming a hard coat layer contains a compound having a cyclic aliphatic hydrocarbon and an unsaturated double bond in a molecule, the compound having an unsaturated double bond with a cyclic aliphatic hydrocarbon in a molecule is used to form an unsaturated double bond in the composition for forming a hard coat layer. 1-90 mass% is preferable in a compound which has, 2-80 mass% is more preferable, 5-70 mass% is especially preferable.

When the composition for hard coat layer formation contains a compound having a cyclic aliphatic hydrocarbon and an unsaturated double bond group in the molecule, it is preferable to further contain at least 5 functional (meth) acrylates.

When the composition for hard coat layer formation also contains 5-functional or more (meth) acrylate, 5-functional or more (meth) acrylate is 1-70 mass% in the compound which has unsaturated double bond in the composition for hard-coat layer formation. Is preferable, 2-60 mass% is more preferable, and 5-50 mass% is especially preferable.

[Translucent particle]

By incorporating light-transmitting particles into the hard coat layer of the present invention, the surface of the hard coat layer may be provided with an uneven shape or an internal haze.

Translucent particles which can be used for 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), crosslinked polystyrene particles (refractive index 1.61), polyvinyl chloride particles (refractive index 1.60), benzoguanamine-melamineformaldehyde particles (refractive index 1.68), silica particles (refractive index 1.46), alumina particles (Refractive index 1.63), zirconia particles, titania particles, or particles having hollows or pores.

Among them, crosslinked poly ((meth) acrylate) particles and crosslinked poly (acryl-styrene) particles are preferably used, and by adjusting the refractive index of the binder in accordance with the refractive index of each light-transmitting particle selected from these particles, Surface irregularities, surface haze, internal haze, and overall haze that are preferable for the hard coat layer 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 transparent particles and the binder of the hard coat layer (the refractive index of the transparent particles-the refractive index of the hard coat layer except the transparent particles) is preferably less than 0.05 as an absolute value, more preferably. Preferably it is 0.001-0.030, More preferably, it is 0.001-0.020. When the difference in refractive index between the light-transmitting particles and the binder in the hard coat layer is less than 0.05, the angle of refraction of the light by the light-transmitting particles becomes small, and the scattered light does not widen to the wide angle, and the polarization of the transmitted light of the optically anisotropic layer is eliminated. It is preferable because there is no deterioration effect such as

In order to realize the difference in refractive index between the particles and the binder, the refractive index of the translucent particles may be adjusted or the refractive index of the binder may be adjusted.

As a 1st preferable aspect, it is a binder (the refractive index after hardening 1.50-1.53) which has a trifunctional or more than trifunctional (meth) acrylate monomer as a main component, and the crosslinked poly (meth) acrylate / styrene polymer which is 50-100 mass% of acrylic content rates. It is preferable to use combining the translucent particle which consists of. By adjusting the composition ratio of the low refractive index acrylic component and the high refractive index styrene component, it is easy to make the refractive index difference 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 the mass ratio. As refractive index of the translucent particle which consists of crosslinked poly (meth) acrylate / styrene polymer, 1.49-1.55 are preferable, More preferably, it is 1.50-1.54, Most preferably, it is 1.51-1.53.

As a 2nd preferable aspect, the refractive index of the binder which consists of a monomer and inorganic fine particles is adjusted by using together the inorganic fine particle of 1-100 nm average particle size with respect to the binder which has a trifunctional or more than (meth) acrylate monomer as a main component, In this case, the refractive index difference with the existing light transmitting particles is adjusted. As the inorganic particles, 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 , Al ₂ O ₃ , In ₂ O ₃ , ZnO, SnO ₂ , Sb ₂ O ₃ , ITO and the like. Preferably, SiO ₂ , ZrO ₂ , Al ₂ O ₃ And the like. These inorganic particles can be mixed and used in the range of 1-90 mass% with respect to the total amount of a monomer, Preferably it is 5-65 mass%.

Here, the refractive index of the hard coat layer except the translucent particle can be quantitatively evaluated by measuring directly with an Abbe refractometer, measuring a spectral reflection spectrum or spectral ellipsometry. The refractive index of the said translucent particle is the refractive index of the solvent when the turbidity becomes the minimum by measuring the turbidity by disperse | distributing the translucent particle equally in the solvent which changed the mixing ratio of two types of solvents from which refractive index differs, and changing the refractive index. Is measured by measuring with an Abbe refractometer.

1.0-12 micrometers is preferable, as for the average particle diameter of a translucent particle, More preferably, it is 3.0-12 micrometers, More preferably, it is 4.0-10.0 micrometers, Most preferably, it is 4.5-8 micrometers. By setting the refractive index difference and the particle size in the above range, the scattering angle distribution of the light does not widen to the wide angle, and does not cause the character unclearness and the contrast decrease of the display. 12 micrometers or less are preferable at the point which does not need to thicken the film thickness of the layer to add, and does not produce problems, such as a curl and a cost increase. Moreover, it is preferable to carry out in the said range also in the point which suppresses the application | coating amount at the time of coating, quick drying, and does not produce surface defects, such as a dry nonuniformity.

The measuring method of the average particle diameter of the light-transmitting particle can be applied to any measuring method as long as it is a measuring method of measuring the average particle diameter of the particle. Preferably, the particle is observed by a transmission electron microscope (500,000 to 2 million times magnification) 100 pieces are observed, and the average value can be obtained.

The shape of the light-transmitting particles is not particularly limited, but in addition to the spherical particles, light-transmitting particles having different shapes such as mold release particles (eg, non-spherical particles) may be used in combination. In particular, when the short axis of the non-spherical particles is aligned with the normal direction of the hard coat layer, a smaller particle size can be used than the spherical particles.

It is preferable to mix | blend the said translucent particle so that 0.1-40 mass% may be contained in the total solid content of a hard-coat layer. More preferably, it is 1-30 mass%, More preferably, it is 1-20 mass%. The internal haze can be controlled to a preferable range by making the compounding ratio of translucent particle into the said range.

The coating amount of the light-transmitting particles is preferably 10 to 2500 mg / m 2, more preferably 30 to 2000 mg / m 2, still more preferably 100 to 1500 mg / m 2.

<Translucent particle preparation, classification method>

Examples of the method for producing the light-transmitting particles include suspension polymerization, emulsion polymerization, soap-free emulsion polymerization, dispersion polymerization, seed polymerization, and the like, and may be produced by any method. These production methods are described in, for example, "Experimental Method of Polymer Synthesis" (Otsu Takayuki, Masayoshi Kinoshita, Chemical Co., Ltd.) 130 pages and 146 pages, 147 pages "147 Synthetic Polymer", p.246-290, Copper 3, p.1 to 108, etc., and Japanese Patent No. 2543503, Japanese Patent No. 3508304, Japanese Patent No. 2746275, Japanese Patent No. 3251560, Japanese Patent No. 3580320, and Japanese Publication The method described in Unexamined-Japanese-Patent No. 10-1561, Unexamined-Japanese-Patent No. 7-2908, Unexamined-Japanese-Patent No. 5-297506, Unexamined-Japanese-Patent No. 2002-145919, etc. can be referred to.

The particle size distribution of the light transmitting particles is preferably monodisperse particles from the control of haze value and diffusivity, and homogeneity on the coated surface. 15% or less of CV value which shows the uniformity of a particle diameter is preferable, More preferably, it is 13% or less, More preferably, it is 10% or less. In addition, when the particle | grains larger than 20% of average particle diameter are prescribed | regulated as coarse particle, it is preferable that the ratio of this coarse particle is 1% or less of the total particle number, More preferably, it is 0.1% or less, More preferably, it is 0.01. It is% or less. Particles having such a particle size distribution are also advantageous means of classifying after preparation or synthesis reaction, and the particles having a desirable distribution can be obtained by increasing the number of times of classification or increasing the degree thereof.

It is preferable to use a method such as a wind power classification method, a centrifugal classification method, a sediment classification method, a filtration classification method, and an electrostatic classification method.

[Photopolymerization initiator]

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

The content of the photopolymerization initiator in the composition for forming a hard coat layer is sufficient to polymerize the polymerizable compound contained in the composition for forming a hard coat layer, and the hard coat is set at a sufficiently small amount so that the starting point does not increase excessively. 0.5-8 mass% is preferable with respect to the total solid in the composition for layer formation, and 1-5 mass% is more preferable.

[UV absorber]

Although the optical film of this invention is used for a polarizing plate or a liquid crystal display device member, from an viewpoint of prevention of deterioration, such as a polarizing plate or a liquid crystal, an ultraviolet absorber is contained in an optical film by containing an ultraviolet absorber in a hard-coat layer in the range which does not inhibit UV hardening. May be given.

[solvent]

The composition for hard coat layer formation of this invention can contain a solvent. As the solvent, various solvents may be used in consideration of the solubility of the monomer, the dispersibility of the light-transmitting particles, the dryness at the time of coating, and the like. As such an organic solvent, for example, dibutyl ether, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydro Furan, anisole, phentol, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, acetone, methyl ethyl ketone (MEK), diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone, methyl Cyclohexanone, ethyl formate, propyl formate, pentyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, γ-butyrolactone, 2-methoxy acetate, methyl 2-ethoxyacetate, 2- Ethyl ethoxyacetate, 2-ethoxypropionate, 2-methoxyethanol, 2-propoxyethanol, 2-butoxyethanol, 1,2-diacetoxyacetone, acetylacetone, diacetone alcohol, methyl acetacetate, Methyl alcohol, ethyl alcohol such as ethyl acetate , 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. It can be used individually by 1 type or in combination of 2 or more types.

It is preferable to use a solvent so that the density | concentration of solid content of the composition for hard-coat layer formation of this invention may be in the range of 20-80 mass%, More preferably, it is 30-75 mass%, More preferably, it is 40-70 mass % to be.

[Antireflection layer]

As described above, laminating an antireflection layer on the hard coat layer is also one of the preferred embodiments of the present invention. In the present invention, a known antireflection layer can be preferably used. Especially, a UV hardening antireflection layer is preferable.

The antireflection layer may be a low reflectance layer having a layer thickness of λ / 4 or a multilayer structure, but a low reflectance layer having a layer thickness of λ / 4 having a single layer configuration is particularly preferable. Although the low refractive material which can be preferably used by this invention is demonstrated below, this invention is not limited to the following.

[Material of low refractive index layer]

The material of the low refractive index layer will be described below.

[Inorganic Particulates]

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

Examples of the inorganic fine particles include magnesium fluoride and silica fine particles from the viewpoint of 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 to 120 nm, more preferably 10 to 100 nm, 20 to 100 nm, and most preferably 30 to 90 nm.

When the particle diameter of the inorganic fine particles is too small, the effect of improving scratch resistance is less. When the particle size of the inorganic fine particles is too large, fine irregularities are formed on the surface of the low refractive index layer, and the appearance and integral reflectance of perfect black are deteriorated. In addition, in the case of using the hollow silica fine particles described later, if the particle diameter is too small, the proportion of the steel cavity decreases and a sufficient decrease in the refractive index cannot be expected. The inorganic fine particles may be crystalline or amorphous, may be monodisperse particles, or may be aggregated particles as long as the predetermined particle size is satisfied. The shape is most preferably spherical, but may be indefinite.

The application amount of the inorganic fine particles is preferably from 1 mg / m 2 to 100 mg / m 2, more preferably from 5 mg / m 2 to 80 mg / m 2, and still more preferably from 10 mg / m 2 to 60 mg / m 2. When too small, sufficient low refractive index cannot be expected, or the effect of improving scratch resistance is reduced, or when too large, fine unevenness occurs on the surface of the low refractive index layer, resulting in deterioration of perfect black appearance or integral reflectance.

(Porous or hollow particulate)

In order to achieve low refractive index, it is preferable to use fine particles having a porous or hollow structure. In particular, it is preferable to use hollow 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 to set the porosity of the hollow fine particles to the above-mentioned 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 refractive index of the fine particles is preferably 1.10 to 1.40, more preferably 1.15 to 1.35, and most preferably 1.15 to 1.30. The refractive index here shows the refractive index as the whole particle | grain, and does not show the refractive index only of the silica of the outer shell which forms a silica particle.

The hollow silica may be used in combination of two or more species having different average particle sizes. Here, the average particle diameter of hollow silica can be calculated | required from an electron micrograph.

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

In the present invention, silica particles without voids can be used in combination with hollow silica. The preferred particle size of the silica without voids is 30 nm or more and 150 nm or less, more preferably 35 nm or more and 100 nm or less, most preferably 40 nm or more and 80 nm or less.

[Surface Treatment Method of Inorganic Fine Particles]

In the present invention, the inorganic fine particles may be surface-treated with a silane coupling agent or the like by a conventional method.

In particular, in order to improve the dispersibility of the binder for forming the low refractive index layer, the surface of the inorganic fine particles is preferably treated with a hydrolyzate of the organosilane compound and / or a partial condensate thereof. More preferably, either or both of an acid catalyst and a metal chelate compound are used. The surface treatment method of the inorganic fine particles is described in paragraphs [0046] to [0076] of JP-A-2008-242314, and the organosilane compound, the siloxane compound, the surface treatment solvent and the surface described in the document. The catalyst of a process, a metal chelate compound, etc. can be used suitably also in this invention.

As the low refractive index layer, a (b2) fluorine-containing or non-fluorine-containing monomer having a polymerizable unsaturated group can be used. Regarding the non-fluorine monomer, it is preferable to also use a compound having an unsaturated double bond that can be used in the hard coat layer. As a fluorine-containing monomer, it is represented by following General formula (1), It is preferable to use a fluorine-containing polyfunctional monomer (d) which contains 35 mass% or more of fluorine, and whose calculated value of the molecular weight between all bridge | crosslinks is smaller than 500.

(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, n represents an integer of 3 or more. L represents a single bond or a divalent linking group, and m represents 0 or 1). Y represents a polymerizable unsaturated group.)

Rf ² may contain at least any one of an oxygen atom and a hydrogen atom. Rf ² is a chain (linear or branched) or cyclic.

It is preferable that Y is a group containing two carbon atoms which form an unsaturated bond, It is more preferable that it is a radically polymerizable group, A (meth) acryloyl group, an allyl group, the (alpha)-fluoroacryloyl group, and -C Particular preference is given to (O) OCH = CH ₂ . More preferable in terms polymerizable Among these are, (meth) acryloyl group having a radical polymerizable, an allyl group, a group in α- fluoro-acrylic, and C (O) OCH = CH ₂ to be.

L represents a divalent linking group, and in detail, an alkylene group having 1 to 10 carbon atoms, an arylene group having 6 to 10 carbon atoms, -O-, -S-, -N (R)-, an alkylene group having 1 to 10 carbon atoms, and- The group obtained by combining O-, -S-, or N (R)-, and the group obtained by combining -O-, -S-, or N (R)-with a C6-C10 arylene group are shown. R represents a hydrogen atom or a C1-C5 alkyl group. When L represents an alkylene group or an arylene group, it is preferable that the alkylene group and arylene group represented by L are substituted by the halogen atom, and it is preferable that it is substituted by the fluorine atom.

Specific examples of the compound represented by the general formula (1) are described in JP 2010-152311 A [0121] to [0163] paragraph.

[Optical anisotropic layer]

You may form an optically anisotropic layer in the optical film of this invention. The optically anisotropic layer may be an optically anisotropic layer in which a film having a constant retardation is uniformly formed in-plane, or an optically anisotropic layer in which a pattern in which retardation regions having different phase directions or phase retardations are regularly arranged in-plane may be formed. .

As mentioned above, it is preferable that the optical film of this invention is a surface film in which the hard-coat layer of a liquid crystal display device was laminated | stacked. When the optical film of the present invention has both a hard coat layer and an optically anisotropic layer, it is preferable that the optically anisotropic layer is formed on the surface where the hard coat layer is not laminated via the base film.

When the optical film of this invention has such an aspect, the low moisture-permeable layer may be laminated | stacked on the same side as a hard coat layer with respect to a base film, may be formed in the opposite side to a hard coat layer, and is laminated | stacked on both surfaces of a base film You may be.

As a preferable layer structure in the case where the low moisture-permeable layer is laminated | stacked on the same side as a hard coat layer with respect to a base film, the preferable layer structure in the case of laminating | stacking said hard coat layer can be used.

On the other hand, when the low moisture-permeable layer is laminated | stacked on the same side as an optically anisotropic layer with respect to a base film, the low moisture-permeable layer may be laminated | stacked between a base film and an optically anisotropic layer, and a base film, an optically anisotropic layer, and a low moisture-permeable layer It may be laminated in order.

Although an optically anisotropic layer can select material and manufacturing conditions according to various uses, in this invention, the optically anisotropic layer using a polymeric liquid crystalline compound is preferable. In that case, it is also a preferable aspect that the orientation film is formed in contact with an optically anisotropic layer between an optically anisotropic layer and a base film.

As a preferable example having an optically anisotropic layer uniformly formed in a plane, the optically anisotropic layer is a? / 4 film, and is particularly useful as a member of an active 3D liquid crystal display. As an aspect in which the anisotropic layer and the hard coat layer of the [lambda] / 4 film are laminated on opposite sides via a base film, they are described in JP 2012-098721 A and JP 2012-127982 A. Such an embodiment can be preferably used in an optical film.

On the other hand, as a preferable example of the optically anisotropic layer in which the pattern was formed, the pattern-type (lambda) / 4 film | membrane is mentioned, The aspect of Unexamined-Japanese-Patent No. 4825934 and 4887463 can be used suitably for the optical film of this invention.

[Polarizer]

The polarizing plate of the present invention is characterized by including at least one polarizing element and the optical film of the present invention as a protective film for the polarizing element.

The optical film of this invention can be used as a protective film for polarizing plates. When used as a protective film for a polarizing plate, the production method of the polarizing plate is not particularly limited and can be produced by a general method. Alkali treatment of the obtained optical film and the polyvinyl alcohol film are immersed and extended in the iodine solution, and there exists a method of bonding together using the fully saponified polyvinyl alcohol aqueous solution on both sides of the polarizer manufactured. Instead of alkali treatment, you may perform the easily bonding process described in Unexamined-Japanese-Patent No. 6-94915 and Unexamined-Japanese-Patent No. 6-118232. Moreover, you may perform surface treatment as mentioned above. The bonding surface with the polarizer of an optical film may be the surface which laminated | stacked the low moisture-permeable layer, and the surface which did not laminate | stack the low moisture-permeable layer may be sufficient.

As an adhesive agent used for bonding a protective film process surface and a polarizer, polyvinyl alcohol adhesives, such as polyvinyl alcohol and polyvinyl butyral, vinyl latexes, such as butylacrylate, etc. are mentioned, for example. .

A polarizing plate is comprised by the polarizer and the protective film which protects both surfaces, Moreover, it is comprised by bonding a protective film to one surface of this polarizing plate, and a separate film to the opposite surface. A protective film and a separate film are used for the purpose of protecting a polarizing plate at the time of a polarizing plate shipment, a product inspection, etc. In this case, a protective film is bonded together for the purpose of protecting the surface of a polarizing plate, and is used for the opposite surface side of the surface which affixes a polarizing plate to a liquid crystal plate. Moreover, a separator film is used for the purpose of covering the adhesive layer bonded to a liquid crystal plate, and is used for the surface side which a polarizing plate bonds to a liquid crystal plate.

[Liquid crystal display device]

The liquid crystal display of the present invention is characterized in that it comprises a liquid crystal cell and a polarizing plate of the present invention disposed on at least one side of the liquid crystal cell and the optical film of the present invention contained in the polarizing plate is arranged to be the outermost layer .

(Composition of General Liquid Crystal Display)

The liquid crystal display device comprises a liquid crystal cell formed by supporting a liquid crystal between two electrode substrates, two polarizing plates disposed on both sides thereof, and at least one optical compensation film disposed between the liquid crystal cell and the polarizing plate as necessary. Has a configuration

The liquid crystal layer of the liquid crystal cell is usually formed by encapsulating a liquid crystal in a space formed by sandwiching a spacer between two substrates. The transparent electrode layer is formed on the substrate as a transparent film containing a conductive material. In the liquid crystal cell, a gas barrier layer, a hard coat layer or an undercoat layer (undercoat layer) (used for bonding the transparent electrode layer) may be further formed. These layers are normally formed on a board | substrate. The substrate of the liquid crystal cell generally has a thickness of 50 μm to 2 mm.

Although the board | substrate containing a liquid crystal cell is normally arrange | positioned between two polarizing plates in a liquid crystal display device, although the protective film for polarizing plates to which the optical film of this invention is applied can be used as a protective film of any one of two polarizing plates, It is preferable to be used as a protective film arrange | positioned on the outer side of a liquid crystal cell with respect to a polarizer among long protective films.

It is especially preferable to arrange | position the optical film of this invention as a visual side protective film of a visual side polarizing plate among two polarizing plates.

Moreover, after arrange | positioning the optical film of this invention as a protective film of the visual recognition side of a visual recognition side polarizing plate among two polarizing plates, the optical film of this invention is also arrange | positioned also to the backlight side protective film of a backlight side polarizing plate, and to two polarizing plates It is also a preferable aspect to inhibit the expansion and contraction of the polarizer included to prevent the panel from warping.

(Type of liquid crystal display device)

The film of this invention can be used for the liquid crystal cell of various display modes. TN (Twisted Nematic), IPS (In-Plane Switching), FLC (Ferroelectric Liquid Crystal), AFLC (Anti-ferroelectric Liquid Crystal), OCB (Optically Compensatory Bend), STN (Super Twisted Nematic), VA (Vertically Aligned), Various display modes have been proposed, such as Electrically Controlled Birefringence (ECB), and Hybrid Aligned Nematic (HAN). Moreover, the display mode which orientation-divided the said display mode is also proposed. The optical film of this invention is effective also in the liquid crystal display device of any display mode. It is also effective in any of liquid crystal display devices of transmission type, reflection type, and semi-transmission type.

Example

Hereinafter, the present invention will be described in detail based on examples. Materials, reagents, amounts of substances, proportions thereof, operations, and the like shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the present invention is not limited to the following examples.

[Production Example 1]

<Production of Base Film 1>

In an internal 30 liter reaction kiln equipped with a stirring device, a temperature sensor, a cooling tube and a nitrogen introduction tube, 8000 g of methyl methacrylate (MMA), 2000 g of 2- (hydroxymethyl) acrylate (MHMA) and polymerization 10000 g of toluene was thrown as a solvent, and it heated up to 105 degreeC, passing nitrogen through this. At the start of reflux according to the elevated temperature, 10.0 g of t-amyl peroxy isononanoate was added as a polymerization initiator, and a solution consisting of 20.0 g of t-amyl peroxy isononanoate and 100 g of toluene was added over 2 hours. While dripping, solution polymerization was advanced under reflux of about 105-110 degreeC, and further aged for 4 hours. The polymerization reaction rate was 96.6%, and the content (mass ratio) of MHMA in the obtained polymer was 20.0%.

Next, 10 g of a stearyl phosphate / distearyl phosphate mixture (Phoslex A-18, manufactured by Sakai Chemical Co., Ltd.) was added to the obtained polymerization solution, under reflux of about 80 to 100 ° C. for 5 hours, The ring condensation reaction was advanced.

Next, the obtained polymerization solution was subjected to a vent type screw twin screw extruder having a barrel temperature of 260 ° C., a rotational speed of 100 rpm, a reduced pressure of 13.3 to 400 hPa (10 to 300 mmHg), one rear vent number, and four pore vent numbers (φ). = 29.75 mm, L / D = 30), which was introduced at a treatment rate of 2.0 kg / hour in terms of resin amount, and subjected to a cyclocondensation reaction and devolatilization in an extruder. Next, after completion of devolatilization, the resin in the hot melt state left in the extruder was discharged from the tip of the extruder, pelletized by a pelletizer, and a transparent pellet A made of an acrylic resin having a lactone ring structure in the main chain was obtained. . The weight average molecular weight of this resin was 148000 and the melt flow rate (The test temperature was 240 degreeC and the load was 10 kg based on JIS K7120. The same also in the following manufacture example) is 11.0 g / 10min, glass transition. The temperature was 130 ° C.

Next, the glass transition temperature is obtained by kneading the obtained pellets and AS resin (Toyo Styrene, trade name: Toyo AS AS20) using a single screw extruder (φ = 30 mm) at a mass ratio of pellets / AS resin = 90/10. Transparent pellets B at 127 ° C were obtained.

The pellet B of the resin composition prepared above was melt-extruded from the coat hanger type T die using the twin screw extruder, and the resin film of about 160 micrometers in thickness was produced.

Next, the obtained non-stretched resin film was biaxially stretched by 2.0 times in the longitudinal direction and 2.0 times in the transverse direction (drawing ratio was 4 times in area ratio) to prepare a transparent plastic film base material. The biaxially stretchable 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.

[Production Example 2]

<Production of Base Film 2>

The pellet B of the resin composition prepared above was melt-extruded from the coat hanger type T die using the twin screw extruder, and the resin film of about 500 micrometers in thickness was produced.

Next, the biaxial stretching of the obtained unstretched resin film was carried out 3.4 times in the longitudinal direction and 3.6 times in the horizontal direction (drawing ratio was 12.2 times in area ratio), and the transparent plastic film base material was produced. The biaxially stretchable 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.

[Production Example 3]

<Production of Base Film 3>

41.5 parts of methyl methacrylate (MMA), 6 parts of methyl 2- (hydroxymethyl) acrylate (MHMA), 2.5 in an internal 30 L reaction kiln with a stirring device, a temperature sensor, a cooling tube and a nitrogen introduction tube. Part 2- [2'-hydroxy-5'-methacryloyloxy] ethylphenyl] -2H-benzotriazole (manufactured by Otsuka Chemical, trade name: RUVA-93), 50 parts of toluene as a polymerization solvent, 0.025 parts of oxidation 0.025 parts of n-dodecyl mercaptan was thrown in as an inhibitor (Asahi telephone industry make, Adecastab 2112) and a chain transfer agent, and it heated up to 105 degreeC, passing nitrogen through this. At the beginning of reflux at elevated temperature, 0.05 part of t-amylperoxyisononanoate (Alkema Yoshitomi, trade name: Luperox 570) was added as a polymerization initiator, and 0.10 part of t-amylperoxyisononano was added. The solution was dripped over 3 hours, the solution polymerization was advanced under reflux of about 105-110 degreeC, and further aged for 4 hours.

Next, 0.05 part of 2-ethylhexyl phosphate (manufactured by Sakai Chemical Co., Ltd., Phoslex A-8) was added to the obtained polymerization solution as a catalyst for the cyclocondensation reaction, under reflux of about 90 to 110 ° C. After advancing the cyclocondensation reaction for 2 hours, the polymerization solution was heated for 30 minutes by an autoclave at 240 ° C to further advance the cyclocondensation reaction. Next, 0.94 part of CGL777MPA (made by Chiba Specialty Chemicals) was mixed as the ultraviolet absorber to the polymerization solution after reaction progressed.

Next, the obtained polymerization solution was made into barrel temperature 240 degreeC, rotation speed 100rpm, pressure reduction degree 13.3-400 hPa (10-300 mmHg), one rear vent number, and four pore vent numbers (the 1st, Vent type screw twin screw extruder (Φ = 50.0 mm, L / D) in which a leaf disc polymer filter (filtration precision of 5 µ, filtration area of 1.5 m 2) is arranged at the tip of the second, third, and fourth vents. = 30) was introduced at a processing rate of 45 kg / hour in terms of resin amount, and devolatilization was performed. At that time, the mixed solution of the antioxidant / cyclic catalyst deactivator prepared separately from the first vent at a feed rate of 0.68 kg / hour and from behind the third vent at a feed rate of 0.22 kg / hour Each was put in.

In the mixed solution of antioxidant / ring catalyst deactivator, 200 parts of toluene was added to 50 parts of antioxidant (Sumitomo Chemical Sumiiser GS) and 35 parts of octylic acid zinc (Nippon Chemical Industries, Nikka Oxide 3.6%) as the deactivator. A solution dissolved in was used.

Next, after the devolatilization is completed, the resin in the hot melt state left in the extruder is discharged with filtration by a polymer filter from the tip of the extruder, pelletized by a pelletizer, and acryl having a lactone ring structure in the main chain. The pellet C of the transparent resin composition containing resin and a ultraviolet absorber was obtained. The weight average molecular weight of resin was 145000, and glass transition temperature (Tg) of resin and the resin composition was 122 degreeC.

The pellet C of the resin composition prepared above was melt-extruded from the coat hanger type T die using the twin screw extruder, and the resin film of about 160 micrometers in thickness was produced.

Next, the obtained non-stretched resin film was biaxially stretched by 2.0 times in the longitudinal direction and 2.0 times in the transverse direction (drawing ratio was 4 times in area ratio) to prepare a transparent plastic film base material.

As a result of measuring the physical property of the biaxially stretchable resin film obtained in this way, thickness is 40 mm, haze (turbidity) is 0.3%, glass transition temperature is 128 degreeC, and the transmittance | permeability with respect to the light of 380 nm is 5.8%, 500 nm. The transmittance with respect to light was 92.2%.

[Production Example 4]

[Preparation of composition for low moisture vapor layer formation]

It prepared as shown below.

(Composition of Composition B-1 for Low Water Vapor Layer Formation)

A-DCP (100%) 97.0 g

Irgacure 907 (100%) 3.0 g

0.04 g of SP-13

MEK 81.8 g

[Production Example 5]

(Composition of Composition B-2 for Low Water Vapor Layer Formation)

AA-BPEF (100%) 97.0 g

Irgacure 907 (100%) 3.0 g

0.04 g of SP-13

MEK 81.8 g

Production Example 6

(Composition of Composition B-3 for Low Water Vapor Layer Formation)

PET30 (100%) 97.0 g

Irgacure 907 (100%) 3.0 g

0.04 g of SP-13

MEK 81.8 g

The used material is shown below.

A-DCP: Tricyclodecane dimethanol dimethacrylate [manufactured by Shin-Nakamura Chemical Industry Co., Ltd.]

AA-BPEF: 9,9-bis [4- (2acryloyloxyethoxy) phenyl] fluorene [manufactured by Shin-Nakamura Chemical Industry Co., Ltd.]

· PET30: a mixture of pentaerythritol tetraacrylate and pentaerythritol triacrylate (manufactured by Nippon Yakuza Co., Ltd.)

Irgacure 907: polymerization initiator [manufactured by Chiba Specialty Chemicals Co., Ltd.]

Leveling agent

SP-13:

[Chemical Formula 14]

<Production of Optical Film 101>

Fujitaek TD80 (manufactured by Fujifilm Co., Ltd., width 1,340 mm, thickness 80 µm) was removed from the roll form as the base film, and the composition B-1 for forming the low moisture-permeable layer was used. By the die-coating method using the slot die of Example 1, it apply | coated on the conditions of a conveyance speed of 30 m / min, and dried at 60 degreeC for 150 second. Subsequently, ultraviolet rays having an illuminance of 400 mW / cm 2 and an irradiation dose of 60 mJ / cm 2 were irradiated with an air-cooled metal halide lamp (manufactured by Igraphics) of 160 W / cm at an oxygen concentration of about 0.1% under nitrogen purge. The coating layer was cured and wound up. The coating amount was adjusted so that the film thickness of the low moisture-permeable layer became 5 micrometers.

The obtained optical film was made into the optical film 101.

<Production of Optical Films 102-116>

In manufacture of the optical film 101, it carried out similarly to the optical film 101, except having made the film thickness of the base film, the composition for low moisture-permeable layer formation, and the low moisture-permeable layer as Table, and manufactured optical films 102-116.

[Evaluation of optical film]

About the produced optical film of each Example and the comparative example, film thickness was measured and the following physical property measurement and evaluation were performed. The results are shown in Table 1 below.

In addition, the film thickness of the low moisture-permeable layer measured the film thickness before and after lamination | stacking of the low moisture-permeable layer, and calculated | required from the difference.

(1) Water vapor permeability (Water vapor permeability at 40 ° C. and 90% relative humidity)

As a method for measuring the moisture permeability, the method described in pages 285 to 294: Measurement of Vapor Permeation Amount (Mass Method, Thermometer Method, Vapor Pressure Method, and Adsorption Amount Method) of Polymer Properties II (Polymer Experiment Lecture 4 Kyoritsu Publishing) was applied.

70 mmφ of optical film sample of each Example and a comparative example was humidified for 24 hours at 40 degreeC and 90% of a relative humidity, respectively, and a moisture permeability = unit after mass-humidity mass after humidity control using the moisture permeation cup according to JISZ-0208. The amount of water per area (g / m 2) was calculated. In addition, in this measurement, the moisture permeability value was corrected with the cup of the blank which does not contain a moisture absorbent.

[Evaluation of panel]

&Lt; Production of polarizing plate &

1) saponification of the film

After immersing a commercially available cellulose acylate film (Fujitak ZRD40, Fujifilm Co., Ltd.) and optical films 101-104 in 1.5 mol / L NaOH aqueous solution (saponifying liquid) kept at 55 degreeC for 2 minutes, a film The mixture was washed with water and immersed in a 25 ° C 0.05 mol / L sulfuric acid aqueous solution for 30 seconds again, and further, the water washing bath was passed under water flowing for 30 seconds to make the film neutral. And water removal by air knife was repeated 3 times, and after removing water, it was made to dry for 15 second in the drying zone of 70 degreeC, and the saponified film was produced.

2) manufacture 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 polarizer of a film thickness of 20 micrometers was manufactured.

3) bonding

(Manufacture of Polarizing Plates 101-104)

Said optical film 101-104 after saponification (it arrange | positions the surface which does not laminate | stack the low moisture-permeable layer of each optical film so that it may contact a polarizer), the polarizer manufactured above, and the cellulose acylate film ZRD40 after saponification in this order, PVA It bonded together with the type | system | group adhesive agent, it heat-dried, and manufactured polarizing plates 101-104.

At this time, it arrange | positioned so that the longitudinal direction of the roll of the produced polarizer and the longitudinal direction of optical films 101-104 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.

The obtained polarizing plates 101-104 were set as polarizing plates 101-104, respectively.

(Manufacture of Polarizing Plates 105-116)

On the single side | surface of the polarizer manufactured above, the surface which did not laminate | stack the low moisture-permeable layer of the optical films 105-114 which were manufactured using the acrylic adhesive agent on the surface which did not laminate | stack the low moisture-permeable layer of the optical films 105-116 is corona. After the treatment was performed, the bonding was performed. The said saponified commercially available cellulose acylate film ZRD40 was affixed on the other side of the polarizer manufactured above using the polyvinyl alcohol-type adhesive agent, and it dried at 70 degreeC for 10 minutes or more, and produced polarizing plates 105-116.

At this time, it arrange | positioned so that the longitudinal direction of the roll of the polarizer manufactured and the longitudinal direction of optical films 105-116 might 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.

The obtained polarizing plates were made into each polarizing plate 105-116.

(Production of Polarizing Plates 205 to 208)

About the single side | surface of the polarizer manufactured above, the surface which laminated | stacked the low moisture-permeable layer of the produced optical films 105-108 using the acrylic adhesive agent was bonded after corona treatment. The said saponified commercially available cellulose acylate film ZRD40 was affixed on the other side of the polarizer manufactured above using the polyvinyl alcohol-type adhesive agent, and it dried at 70 degreeC for 10 minutes or more, and produced polarizing plates 205-208.

At this time, it arrange | positioned so that the longitudinal direction of the roll of the polarizer manufactured and the longitudinal direction of the optical films 105-108 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.

The obtained polarizing plates were made into each polarizing plate 205-208.

<Mount for IPS Panel>

The upper and lower polarizing plates of the IPS mode liquid crystal cell (LGD 42LS5600) were peeled off, and the polarizing plates 101-116 and 205-208 were stuck so that ZRD40 might be the liquid crystal cell side. It was set as cross nicol arrangement so that the transmission axis of an upper polarizing plate might be an up-down direction, and the transmission axis of a lower polarizing plate might be a left-right direction.

The obtained liquid crystal display device was set as liquid crystal display devices 101-116, 205-208, respectively.

Moreover, the structure of the polarizing plate at the time of mounting to an IPS panel was described in Table 2 below.

The black display nonuniformity after the high temperature, high humidity environment time progress of the liquid crystal display device manufactured as mentioned above was evaluated. The results are shown in Tables 1 and 2 below.

(Black indication unevenness after high temperature, high humidity environment time lapse)

After 36 hours have elapsed at 60 ° C. and 90% relative humidity, the liquid crystal display device is turned on after humidifying for 24 hours under an environment of 25 ° C. and 60% relative humidity, and the degree of color unevenness at the time of black display is visually observed. The evaluation was carried out in six steps based on the following criteria.

In the six-step evaluation, A to D are within the allowable range, and E and F are outside the allowable range.

Moreover, A-C are preferable, A or B is more preferable, and A is especially preferable.

A: No color staining was observed.

B: Weak color unevenness was observed in an area of 1/8 or less of the display surface.

C: Weak color unevenness was observed in an area exceeding 1/8 of the display surface and below 1/4.

D: Weak color unevenness was observed in the area exceeding 1/4 of the display surface and less than 1/2.

E: Strong color unevenness was observed in the area exceeding 1/4 of the display surface and less than 1/2.

F: Strong color unevenness was observed in the area exceeding 1/2 of the display surface.

From the results shown in Table 1 and Table 2, the following facts are clear.

1. There is a strong correlation between the moisture permeability of the optical film and the display unevenness after elapse of high temperature and high humidity environment, and the lower the moisture permeability, the less black display unevenness is suppressed.

2. The Example of this invention which satisfy | fills the requirements of Claim 1 is preferable because a film thickness is a thin film and low water vapor transmission rate.

3. In this invention, the low moisture-permeable layer formed in the base film which has the (meth) acrylic-type copolymer resin which has a lactone ring structure as a main component, and consists of the composition which has a compound which has a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in a molecule | numerator is formed. An optical film is an example of the preferable aspect of this invention.

4. In the present invention, the high magnification of the base film containing (meth) acrylic copolymer resin as a main component (5 times or more in terms of area) has a moisture permeability per unit film thickness for low magnification stretching (less than 5 times in area terms). The film thickness is thin and the thing which laminated | stacked the low moisture-permeable layer is thin, and the display nonuniformity after time-lapse of high temperature, high humidity environment is suppressed, and it is favorable.

5. The low moisture-permeable layer formed from the composition which has a compound which has a fluorene skeleton and an unsaturated double bond group in a molecule | numerator is also an example of the preferable aspect of this invention.

6. The evaluation result at the time of mounting the optical film of this invention to a panel was the same result which bonded the low moisture-permeable layer and the opposite surface to the polarizer, and bonded the low moisture-permeable layer to the polarizer. The optical film of this invention can be bonded to a both-side multipolarizer.

Next, a hard coat layer is laminated on the optical film of the present invention.

[Production Example 7]

[Preparation of composition for hard coat layer formation]

It prepared as shown below.

(Composition of composition HC-1 for hard coat layer formation)

PET30 (100%) 97.0 g

Irgacure 907 (100%) 3.0 g

0.04 g of SP-13

MEK 81.8 g

[Production Example 8]

[Preparation of composition for hard coat layer formation]

It prepared as shown below.

(Composition of Composition HC-2 for Hard Coat Layer Formation)

DPHA (100%) 48.5 g

A-DCP (100%) 48.5 g

Irgacure 907 (100%) 3.0 g

0.04 g of SP-13

MEK 81.8 g

The used material is shown below.

DPHA: a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (manufactured by Nippon Yakuza Co., Ltd.)

※ The material used in the low moisture vapor barrier is omitted.

[Production Example 9]

<Production of Hard Coat Film 301>

Unexamined-Japanese-Patent No. 2006-122889 Example 1 on the surface in which the roll-shaped optical film 105 manufactured above is laminated | stacked, and the low moisture-permeable layer is laminated | stacked using the said composition for low moisture-permeable layer formation. It applied on the conditions of 30 m / min of conveyance speeds by the die-coat method using the slot die of description, and dried at 60 degreeC for 150 second. Subsequently, using an air-cooled metal halide lamp (manufactured by Igraphics Co., Ltd.) of 160 W / cm at an oxygen concentration of about 0.1% under nitrogen purge again, ultraviolet rays having a light intensity of 400 mW / cm 2 and an irradiation dose of 300 mJ / cm 2 were irradiated. The application layer was cured and wound up. The coating amount was adjusted so that the film thickness of the low moisture permeable layer was 8 占 퐉.

The obtained film was made into the hard coat film 301.

<Production of Hard Coat Films 302-306>

About the hard coat film 301, the coating liquid for hard-coat layer formation was changed into the optical film used as a base film, as shown in Table 3, a hard coat layer was laminated | stacked on the low moisture-permeable layer, and hard coat films 302-306 were manufactured. It was.

<Production of Hard Coat Film 307>

For the hard coat film 302, the hard coat layer was laminated on the opposite side of the low moisture barrier layer in the same manner except that the hard coat layer laminated surface was changed to the opposite side of the low moisture barrier layer, thereby producing a hard coat film 307.

<Production of Hard Coat Films 308-309>

As for the hard coat film 301, the base material and the hard coat layer were changed as shown in Table 3, the hard coat layer was laminated | stacked on the base material, and hard coat films 308-309 were manufactured.

On the other hand, the water vapor transmission rate (A / B) before and after the hard coat layer lamination of the hard coat film 309 satisfies Formula (1) at 0.75.

<Production of Hard Coat Film 310>

30 m of conveyance speeds by the die-coat method using the slot die of Unexamined-Japanese-Patent No. 2006-122889 Example 1 using the composition HC-1 for hard-coat layer formation remove | eliminating base film-1 from roll shape It applied on condition of / min, and dried at 60 degreeC for 150 second. Subsequently, using an air-cooled metal halide lamp (manufactured by Igraphics) of 160 W / cm at an oxygen concentration of about 0.1% under nitrogen purge again, ultraviolet rays having an illuminance of 400 mW / cm 2 and an irradiation dose of 60 mJ / cm 2 were irradiated. The application layer was cured and wound up. The coating amount was adjusted so that the film thickness of the hard coat layer was 8 µm.

Subsequently, using the composition B-1 for low moisture-permeable layer formation, it apply | coated on the conditions of a conveyance speed of 30 m / min by the die-coat method using the slot die of Unexamined-Japanese-Patent No. 2006-122889 Example 1, and 60 It dried at 150 degreeC for 150 second. Subsequently, ultraviolet rays having an illuminance of 400 mW / cm 2 and an irradiation dose of 300 mJ / cm 2 were irradiated with an air-cooled metal halide lamp (manufactured by Igraphics) of 160 W / cm at an oxygen concentration of about 0.1% under nitrogen purge. The application layer was cured and wound up. The coating amount was adjusted so that the film thickness of the low moisture-permeable layer might be 3 micrometers, and the hard coat film 310 was produced.

The polarizing plates 301-310 and liquid crystal display devices 301-310 were manufactured from hard-coat films 301-310 similarly to having produced the liquid crystal display device 105 from the said optical film 105.

The black display unevenness after time of high temperature, high humidity environment was evaluated similarly to liquid crystal display device 105 for liquid crystal display devices 301-310. The evaluation results are shown in Table 3.

[Evaluation of Hard Coat Film]

The film thickness was measured about the produced each optical film of the Example and the comparative example, and the following physical property measurement and evaluation were performed. The results are shown in Table 3 below.

Moreover, the film thickness of the hard-coat layer of hard-coat films 301-310 measured the film thickness before and behind lamination | stacking of a hard-coat layer, and calculated | required it from the difference. In addition, the film thickness of the low moisture-permeable layer of the hard-coat film 310 measured the film thickness before and behind the low moisture-permeable layer lamination | stacking, and calculated | required from the difference.

(2) pencil hardness evaluation

Pencil hardness evaluation as described in JIS K5400 was performed as an index of resistance. After humidifying a light-diffusion film for 2 hours at the temperature of 25 degreeC, and 60% of humidity, it evaluates by the following determination with a load of 4.9 N using the test pencil of 2H-5H prescribed | regulated to JIS S6006, and it is OK. The highest hardness which becomes to be an evaluation value.

OK: 3 or more woundless in evaluating n = 5

NG: 2 or less woundless in the evaluation of n = 5

※ The composition of each hard coat film is as follows.

Hard coat film 301-306

Optical film / hard coat layer / low moisture vapor transmission layer

Hard Coat Film 307

Low Moisture-Proof Layer / Optical Film / Hard Coat Layer

Hard coat film 308-309

Base Film / Hard Coat Layer

Hard Coat Film 310

Base film / hard coat layer / low moisture vapor transmission layer

The following are clear from the result shown in Table 3.

1. By laminating a hard coat layer on the optical film of the present invention, high pencil hardness (3H) can be provided in addition to low moisture permeability.

2. A hard coat film in which a hard coat layer formed of a compound containing a cyclic aliphatic hydrocarbon group and an unsaturated polymerizable group in a molecule and a composition containing at least five functional (meth) acrylates is formed of a (meth) acrylate polymer, Compared with having a hard coat layer formed of a composition containing no cyclic aliphatic hydrocarbon group and unsaturated polymerizable group in a molecule, the effect of reducing moisture permeability is great.

3. The hard coat film 309 in which a hard coat layer formed of a composition containing a compound having a cyclic aliphatic hydrocarbon group and an unsaturated polymerizable group in its molecule and a (meth) acrylate having at least five functionalities is formed of a (meth) acrylate polymer. , The requirements of claim 1 of the present application are satisfied.

4. Laminating a hard coat layer on a low moisture-permeable layer (hard coat film 302), Laminating a low moisture-permeable layer on a hard coat layer (hard coat film 310), a hard coat layer and a low moisture-permeable layer As for the thing arrange | positioned on the opposite surface (hard coat film 305), pencil hardness and water vapor transmission rate are all equally favorable.

[Production Example 10]

(Preparation of coating liquid Ln-1 for low refractive index layers)

Each component was mixed as follows, and it melt | dissolved in the 90/10 mixture (mass ratio) of MEK / MMPG-AC, and prepared the low refractive index layer coating liquid of 5 mass% of solid content.

(Composition of Ln-1)

15.0 g of the following perfluoroolefin copolymer (P-1)

DPHA 7.0 g

RMS-033 5.0 g

20.0 g of the following fluorine-containing monomers (M-1)

50.0 g of hollow silica particles (as solid)

Irgacure 127 3.0 g

The compounds used are shown below.

Perfluoroolefin Copolymer (P-1)

[Chemical Formula 15]

In the structural formula, 50:50 represents a molar ratio.

Fluorinated Monomer (M-1)

[Chemical Formula 16]

DPHA: A mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate, manufactured by Nippon Gunpowder Co., Ltd.

RMS-033: Silicone-based polyfunctional acrylate (Gelest manufactured, Mwt = 28000)

Irgacure 127: photopolymerization initiator, manufactured by Chiba Specialty Chemicals

Hollow silica: Hollow silica particle dispersion (average particle size 45 nm, refractive index 1.25, surface treated with silane coupling agent having acryloyl group, MEK dispersion concentration 20%)

MEK: methyl ethyl ketone

MMPG-Ac: Propylene glycol monomethyl ether acetate

The coating liquid for low refractive index layer was filtered through a polypropylene filter having a pore diameter of 1 μm to prepare a coating liquid. The refractive index after hardening of the low refractive index layer formed by apply | coating-hardening the said coating liquid Ln-1 for low refractive index layers was 1.36.

(Preparation of antireflection film sample 506)

The roll-shaped optical film 106 prepared as described above was unrolled from the roll form, and the die-coating method using the slot die described in JP 2006-122889 Example 1 using the coating liquid HC-1 for hard coat layer. After application | coating on the conditions of a conveyance speed of 30 m / min, and drying for 150 second at 60 degreeC, it uses the air-cooled metal halide lamp (made by Igraphics) of 160 W / cm at oxygen concentration of about 0.1% under nitrogen purge again, Ultraviolet rays with an illuminance of 600 mW / cm 2 and an irradiation dose of 60 mJ / cm 2 were irradiated to cure and wind up the coating layer. The coating amount was adjusted so that the film thickness of the hard coat layer was 8 µm.

Moreover, the hard coat film manufactured above was unwound from the roll form, the coating liquid Ln-1 for low refractive index layers was apply | coated to the side in which the hard coat layer was apply | coated, and the antireflection film sample 507 was produced. Drying conditions of the low refractive index layer were 60 ° C. and 60 seconds, and UV curing conditions were carried out with a 240 W / cm air-cooled metal halide lamp (manufactured by Igraphics) while purging with nitrogen so that the oxygen concentration was 0.1 vol% or less. It used as the irradiation dose of roughness 600mW / cm <2> and irradiation amount 300mJ / cm <2>. The refractive index of the low refractive index layer was 1.36 and the film thickness was 95 nm.

In the antireflection film in which the antireflection layer is laminated as described above, the moisture permeability is low (65 g / m 2 / day), the pencil hardness is high (3H), light leakage is unlikely to occur, and further, the reflectance is low (1.1%), the liquid crystal When used in a display device, there was little reflection of the image. It is also a preferable aspect to laminate | stack and use a hard coat layer and an antireflection layer on the optical film of this invention.

Claims (17)

As an optical film which has a base film which has a (meth) acrylic-type polymer as a main component, and the low moisture-permeable layer laminated | stacked on this base film,
The water vapor transmission rate of the said optical film is 100 g / m <2> / day or less,
The following formula (1) is satisfied, The optical film characterized by the above-mentioned.
Equation (1) 0.01 ≤ A / B ≤ 0.8
(In Formula (1), A shows the water vapor transmission rate of the optical film which laminated | stacked the said low moisture-permeable layer on the said base film, and B shows the water vapor transmission rate of the said base film. However, a water vapor transmission rate is 40 degreeC by the method of JIS0208, It is the value after elapse of 24 hours at 90% of relative humidity.) The method according to claim 1,
The water vapor transmission rate of the said low moisture vapor transmission layer when the film thickness of the said low moisture vapor transmission layer is 10 micrometers.
J _b × d _b / 10
Is 5.0-250 g / m <2> / day, The optical film characterized by the above-mentioned.
(Wherein d _b [μm] represents the film thickness of the low moisture-permeable layer and is calculated from the film thickness difference before and after the low-moisture-permeable layer lamination.
In addition, J _b is an optical film base material and shows a water vapor permeability of the low moisture-permeable layer when separated from the low moisture-permeable layer, the moisture permeability of the optical film J _f, J _s a water vapor transmission rate of the base film, the water vapor permeability of the low moisture-permeable layer J _b It is calculated from the following relational formula when we assume.)
1 / J _f = 1 / J _s + 1 / J _b Equation (n) The method according to claim 1,
Said (meth) acrylic-type polymer is a polymer which has any of a lactone ring structure, a glutaric anhydride ring structure, and a glutalimide ring structure in a principal chain. The method of claim 3, wherein
The optical film whose said (meth) acrylic-type polymer is a polymer which has a unit represented by following General formula (1).
In general formula (1):
[Chemical Formula 1]

(In formula, R <^11> , R <^12> , R <^13> shows a hydrogen atom or an organic residue of C1-C20 each independently. Moreover, the organic residue may contain the oxygen atom.) 5. The method according to any one of claims 1 to 4,
The film thickness of the said base film is 5-80 micrometers, The optical film characterized by the above-mentioned. 5. The method according to any one of claims 1 to 4,
The film thickness of the said low moisture-permeable layer is 1-12 micrometers, The optical film characterized by the above-mentioned. 5. The method according to any one of claims 1 to 4,
Said low moisture-permeable layer is a layer formed from the composition for low moisture-permeability which has a compound which has a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in a molecule | numerator. The method of claim 7, wherein
The said low moisture-permeable layer is a layer in which the compound which has a cyclic aliphatic hydrocarbon group and an unsaturated double bond group in a molecule | numerator is formed from the composition containing 60-99 mass% with respect to the total solid except the inorganic component in the composition for low moisture-permeable layer forming. An optical film characterized by the above-mentioned. 5. The method according to any one of claims 1 to 4,
And the optical film further has a hard coat layer. 5. The method according to any one of claims 1 to 4,
The said hard coat layer is a layer formed from the composition for hard-coat layer formation which has a compound which has a cyclic aliphatic hydrocarbon group and 2 or more unsaturated double bond group in a molecule | numerator. 11. The method of claim 10,
The composition for forming a hard coat layer further contains a 5-functional or higher (meth) acrylate. 5. The method according to any one of claims 1 to 4,
Said low moisture-permeable layer is a layer formed from the composition for low moisture-permeation formation which has a compound which has a fluorene skeleton and an unsaturated double bond group in a molecule | numerator. 13. The method of claim 12,
The low-moisture-permeable layer is a layer in which a compound having a fluorene skeleton and an unsaturated double bond group in a molecule is formed of a composition containing 60 to 99 mass% of the total solid except for the inorganic component in the low-moisture-permeable layer-forming composition. Optical film made. 5. The method according to any one of claims 1 to 4,
The said base film is formed by melt-forming a thermoplastic resin which has a (meth) acrylic-type polymer as a main component, The optical film characterized by the above-mentioned. A process of melt-forming and forming a base film containing (meth) acrylic polymer as a main component,
The manufacturing method of the optical film which has a low moisture-permeable layer laminated | stacked on the base film including the process of laminating | stacking a low moisture-permeable layer on the said base film by application | coating. With polarizer,
At least one optical film of any one of Claims 1-4 is included as a protective film of this polarizer, The polarizing plate characterized by the above-mentioned. With a liquid crystal cell,
It includes the polarizing plate of Claim 16 arrange | positioned in at least one of this liquid crystal cell,
The optical film is disposed so as to be the outermost layer.