KR20190128124A - Substrate and optical film - Google Patents

Abstract

A purpose of the present invention is to provide a base material and an optical film having high adhesiveness. The base material has a water contact angle of 15° to 30° at 25°C of a surface of the base material. A laminated body forms an orientation film on the surface of the base material and the optical film forms an optical anisotropic layer on the orientation film of the laminated body.

Description

Substrate and Optical Film {SUBSTRATE AND OPTICAL FILM}

The present invention relates to a substrate and an optical film.

As flat panel display apparatus FPD, the member containing optical films, such as a polarizing plate and a phase difference plate, is used. As such an optical film, the optical film manufactured by apply | coating the composition containing a polymeric liquid crystal compound on a base material is known. For example, Patent Document 1 describes an optical film formed by applying a composition containing a polymerizable liquid crystal compound on a substrate subjected to an alignment treatment to obtain a coating film and polymerizing the polymerizable liquid crystal compound in the coating film.

Patent Document 1: Japanese Patent Application Laid-Open No. 2007-148098

In the optical film manufactured by apply | coating the composition containing a polymeric liquid crystal compound on a base material, when adhesiveness between a base material and an optical film was inadequate, problems, such as peeling, arose at the time of processing. Therefore, development of the base material which has high adhesiveness was calculated | required from the viewpoint of suppressing peeling at the time of processing.

Under these circumstances, the present inventors came to the present invention as a result of earnestly examining. That is, this invention includes the following inventions.

[1] A substrate having a water contact angle at 25 ° C. of the surface of the substrate at 15 ° to 30 °.

[2] The substrate according to [1], wherein the substrate is a saponified triacetylcellulose substrate.

[3] The substrate according to [1] or [2], which is a substrate subjected to surface treatment under an atmosphere containing nitrogen and oxygen.

[4] The substrate according to [3], wherein the surface treatment is plasma treatment.

[5] A laminate in which an alignment film is formed on the surface of the substrate according to any one of [1] to [4].

[6] The laminate according to [5], wherein the alignment film is an alignment film formed of a photoalignable polymer.

[7] The laminate according to [6], wherein the photo-alignment polymer is a photo-alignment polymer capable of forming a crosslinked structure by light irradiation.

[8] An optical film having an optically anisotropic layer formed on the alignment film of the laminate according to any one of [5] to [7].

[9] The optical film according to [8], wherein the optically anisotropic layer is formed by polymerizing one or more polymerizable liquid crystals.

[10] The optical film as described in [8] or [9], having retardation.

[11] A polarizing plate comprising the optical film according to any one of [8] to [10].

[12] A retardation plate comprising the optical film described in [10].

[13] A flat panel display device comprising the optical film according to any one of [8] to [10].

[14] A method for producing an optical film, which comprises the following steps (1) to (4).

Process (1): The process of apply | coating a photo-alignment polymer on the base material in any one of [1]-[4].

Step (2): a step of forming an alignment film by crosslinking the photo-alignment polymer on the substrate

Process (3): The process of further apply | coating the composition containing a polymeric liquid crystal on an oriented film, and forming a coating film.

Step (4): A step of polymerizing the polymerizable liquid crystal in the coating film to form an optical film.

The base material of this invention is excellent in adhesiveness, Therefore, the optical film which is hard to produce peeling at the time of a process can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a cross-sectional schematic diagram which shows an example of the polarizing plate which concerns on this invention.
2 is a schematic cross-sectional view showing an example of a liquid crystal display device according to the present invention.
3 is a schematic sectional view showing an example of the organic EL display device according to the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated, referring drawings.

The base material of this invention is a base material whose water contact angle in 25 degreeC of the surface is 15 degrees-30 degrees.

The water contact angle of the surface can be measured using a commercially available apparatus. The water contact angle in this invention is the value measured by the droplet method. As such a device, DropMaster 700 manufactured by Kyowa Kaimen Chemical Co., Ltd. is mentioned. As described in JIS R 3257 (1999) "Wetability Test Method of Substrate Glass Surface", the amount of liquid at the time of contact angle measurement may be performed within the range of 1 µL or more and 4 µL or less.

Such substrates may be treated by, for example, vacuum or atmospheric pressure, the surface of the substrate with plasma, laser treatment of the substrate surface, ozone treatment of the substrate surface, saponification of the substrate surface, or flame treatment of the substrate surface. It can prepare by the method. Furthermore, after preparing the film which consists of a material which does not have a hydroxyl group or its precursor group, and adheres to the surface of a base material the primer processing method which coats a coupling agent on this film surface, or the polymer which has a monomer or hydroxyl group which has a hydroxyl group on the surface of a base material, Or it may prepare by the graft polymerization method which irradiates and reacts with an ultraviolet-ray. Especially, the method of plasma-processing the surface of a base material under vacuum or atmospheric pressure is preferable.

As a method of surface-treating a substrate with plasma,

A method of providing a substrate between opposing electrodes under a pressure near atmospheric pressure, generating a plasma, and subjecting the substrate to surface treatment;

A method of flowing a gas between opposed electrodes to plasmaize the gas between the electrodes, and spraying the plasmad gas onto the substrate; and

The low discharge conditions generate | occur | produce a glow discharge plasma, and the method of surface-treating a base material is mentioned.

Among them, a substrate is provided between the opposite electrodes under a pressure near atmospheric pressure, and a plasma is generated to perform a surface treatment of the substrate, or a gas is flowed between the opposite electrodes to plasma the gas between the electrodes. It is preferable to spray a plasma gas on the substrate. Surface treatment by such plasma is usually performed by a commercially available plasma surface treatment apparatus.

In particular, a substrate prepared by plasma treatment of the surface of the substrate with an energy of 200 mJ / cm 2 or less under an atmosphere containing nitrogen and oxygen is preferable. The processing energy at the time of surface treatment of a base material can be computed from the electric power at the time of generating a plasma, the discharge width of an electrode, and the line speed of a base material. From the viewpoint of the adhesion of the substrate, it is preferable to treat the substrate with energy of 120 mJ / cm 2 or less, and more preferably to treat the energy with energy of 100 mJ / cm 2 or less. Moreover, it is preferable to process a base material with energy of 30 mJ / cm <2> or more.

As for the volume content ratio (oxygen: nitrogen) of oxygen with respect to nitrogen in the atmosphere containing nitrogen and oxygen, 0.01: 99.99-15: 85 are preferable, 0.05: 99.95-10: 90 are more preferable, 0.05: 99.95-5 : 95 is more preferable, and 0.05: 99.95-1: 99 are especially preferable.

As the substrate, a transparent substrate is usually used. A transparent base material means the base material which can transmit light, especially visible light, and light transmittance means the characteristic that the transmittance | permeability with respect to the light ray across wavelength 380-780 nm becomes 80% or more. As a specific transparent base material, glass and a translucent resin base material are mentioned, A translucent resin base material is preferable. As a base material, a film type is used normally.

As resin which comprises a translucent resin base material, Polyolefin, such as polyethylene, a polypropylene, norbornene-type polymer; Polyvinyl alcohol; Polyethylene terephthalate; Polymethacrylic acid ester; Polyacrylic acid ester; Cellulose esters; Polyethylene naphthalate; Polycarbonate; Polysulfones; Polyether sulfone; Polyether ketones; Polyphenylene sulfide; And polyphenylene oxides. Especially, triacetyl cellulose is preferable. Triacetyl cellulose includes saponified triacetyl cellulose and unsaponified triacetyl cellulose. It is preferable that a base material is a saponified triacetyl cellulose film.

In the laminated body of this invention, the orientation film is formed in the surface of the base material whose water contact angle in 25 degreeC of said surface is 15 degrees-30 degrees. Although an oriented film is not limited, It is preferable to have solvent tolerance of the grade which does not melt | dissolve by application | coating of the composition for forming the optically anisotropic layer mentioned later, etc. Moreover, it is preferable to have heat resistance in heat processing, such as solvent removal. Examples of such an alignment film include an alignment film formed of an alignment polymer, and an alignment film formed of a photoalignable polymer is preferable.

The method of providing an orientation regulation force to an alignment film is a method by rubbing. Moreover, in the case of the orientation film formed from the photo-alignment polymer, the method of irradiating polarization is also mentioned.

As a photo-alignment polymer, the polymer which has a photosensitive structure is mentioned. When polarized light is irradiated to the photo-alignment polymer which has a photosensitive structure, the photosensitive structure of the irradiated part will be isomerized or bridge | crosslinked, and, thereby, the photo-alignment polymer can orientate and the orientation film to which the orientation regulation force was provided can be obtained.

Examples of the photosensitive structure include an azobenzene structure, a maleimide structure, a chalcone structure, a cinnamic acid structure, a 1,2-vinylene structure, a 1,2-acetylene structure, a spiropyran structure, a spirobenzopyran structure, and a full gid structure. You may use combining the polymer which has 2 or more types of photosensitive structures. The photo-orientable polymer can be obtained by subjecting a monomer having at least one photosensitive structure to chain polymerization, coordination polymerization or ring-opening polymerization such as polycondensation, radical polymerization, anionic polymerization, cationic polymerization by dehydration, deamine, or the like.

As a photo-orientation polymer, Unexamined-Japanese-Patent No. 4450261, Unexamined-Japanese-Patent 4011652, Unexamined-Japanese-Patent No. 2010-49230, Unexamined-Japanese-Patent No. 44409090, Unexamined-Japanese-Patent No. 2007-156439, and Unexamined-Japanese-Patent No. 2007-232934. The photo-orientation polymer described is mentioned.

As a photo-alignment polymer, it is preferable that it is a polymer which forms a crosslinked structure by light irradiation from a viewpoint of the durability at the time of forming the optically anisotropic layer mentioned later.

An oriented film is normally formed by apply | coating the composition containing an orientation polymer (preferably photo-alignment polymer) to the surface whose surface nitrogen presence ratio of the said base material is 0.1-1 atom%, and content of the photo-alignment polymer in the said composition is 0.1-30 mass% is preferable with respect to the gross mass of a composition, and 0.2-15 mass% is more preferable.

It is preferable that the composition containing a photo-alignment polymer contains a solvent. The solvent can be appropriately selected depending on the kind of the photo-alignment polymer and the like, and water; Alcohol solvents such as methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, ethylene glycol methyl ether, ethylene glycol butyl ether and propylene glycol monomethyl ether; Ester solvents such as ethyl acetate, butyl acetate, ethylene glycol methyl ether acetate, γ-butyrolactone, propylene glycol methyl ether acetate and ethyl lactate; Ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone, and methyl isobutyl ketone; Aliphatic hydrocarbon solvents such as pentane, hexane and heptane; Aromatic hydrocarbon solvents such as toluene and xylene; Nitrile solvents such as acetonitrile; Ether solvents such as tetrahydrofuran and dimethoxyethane; And chlorinated hydrocarbon solvents such as chloroform and chlorobenzene. You may use combining 2 or more types of solvents.

The composition containing the photo-alignment polymer may include an additive. As an additive, it is preferable to have a carbon-carbon unsaturated bond and an active hydrogen reactive group in the molecule | numerator from a viewpoint of adhesive improvement with the optically anisotropic layer mentioned later and viscosity adjustment of the said composition. "Active hydrogen reactive group" means a group having reactivity with a group having active hydrogen such as carboxyl group (-COOH), hydroxyl group (-OH), amino group (-NH ₂ ), and specifically, glycidyl group, oxazoline A group, a carbodiimide group, an aziridine group, an imide group, an isocyanato group, a thiisocyanato group, and a maleic anhydride group are mentioned. 1-20 are preferable and, as for the number of carbon-carbon unsaturated bonds which an additive has, 1-10 are more preferable. 1-20 are preferable and, as for the number of the active hydrogen reactive groups which an additive has, 1-10 are more preferable.

The additive preferably has at least two active hydrogen reactive groups, and the active hydrogen reactive groups may be the same or different.

Although the carbon-carbon unsaturated bond which the additive has may be a carbon-carbon double bond or a carbon-carbon triple bond, a carbon-carbon double bond is preferable. Additives containing vinyl groups and / or (meth) acryl groups are preferred. The additive whose active hydrogen-reactive group is chosen from the group which consists of an epoxy group, a glycidyl group, and an isocyanate group is preferable, and the additive which has an acryl group and an isocyanato group is more preferable.

As a specific example of an additive, The compound which has a (meth) acryl group and epoxy groups, such as methacryloxyglycidyl ether and acryloxyglycidyl ether; Compounds having a (meth) acryl group and an oxetane group, such as oxetane acrylate and oxetane methacrylate; Compounds having a (meth) acryl group and a lactone group, such as lactone acrylate and lactone methacrylate; Compounds having a vinyl group and an oxazoline group such as vinyl oxazoline and isopropenyl oxazoline; Oligomers of compounds having (meth) acrylic groups and isocyanato groups, such as isocyanatomethyl acrylate, isocyanatomethyl methacrylate, 2-isocyanatoethyl acrylate, and 2-isocyanatoethyl methacrylate Can be mentioned. Moreover, the compound which has a vinyl group, a vinylene group, and an acid anhydride structure, such as methacrylic anhydride, an acrylic anhydride, maleic anhydride, and a maleic anhydride, is also mentioned. Above all, methacryloxyglycidyl ether, acryloxyglycidyl ether, isocyanatomethyl acrylate, isocyanatomethyl methacrylate, vinyl oxazoline, 2-isocyanatoethyl acrylate, 2-isocyanato Ethyl methacrylate and oligomers thereof are preferable, and isocyanatomethyl acrylate, 2-isocyanatoethyl acrylate and oligomers thereof are more preferable.

As a specific example of the additive which has an isocyanato group, the compound represented by following formula (1) is mentioned.

[In formula (1), n represents the integer of 1-10, R <^1> represents a C2-C20 divalent aliphatic or alicyclic hydrocarbon group, or a C5-C20 divalent aromatic hydrocarbon group. The two R ² in each repeating unit are -NH- on one side and the other on

It is group represented by. R ³ represents a group having a hydroxyl group or a carbon-carbon unsaturated bond. In this formula (1) R ³ wherein at least one R ³ at the carbon - is a group having a carbon unsaturated bond.

Especially, the compound represented by following formula (2) is more preferable.

[In formula (2), n represents the integer of 1-10.]

The compound represented by Formula (2) may use a commercial item, such as Laromer (trademark) LR-9000 (made by BASF Corporation) as it is, and may be used after refine | purifying as needed.

As for content of the additive in the composition containing a photo-alignment polymer, the range of 0.01-10 mass% is preferable with respect to the gross mass of the composition, and the range of 0.02-5 mass% is more preferable. If it is in the said range, it will not reduce the reactivity of the photo-alignment polymer in a composition.

The laminated body of this invention can be produced by irradiating polarization before or after drying the coating film obtained by apply | coating the composition containing a photo-alignment polymer on the said base material. As a method of coating the composition on a substrate, extrusion coating, direct gravure coating, reverse gravure coating, CAP (cap) coating, die coating, inkjet, dip coating, slit coating, spin coating and The coating method by a bar coater is mentioned. Among them, the composition can be continuously applied to the substrate in a roll to roll format, and thus the coating by the CAP coating method, the inkjet method, the dip coating method, the slit coating method, the die coating method and the bar coater. The method is preferred.

By drying the coating film on a base material, low boiling point components, such as a solvent contained in a coating film, are removed.

As a drying method, natural drying, ventilation drying, heat drying, reduced pressure drying, and the method of combining these are mentioned. 10-250 degreeC is preferable and, as for a drying temperature, 25-200 degreeC is more preferable. Although drying time changes with kinds of solvent, 5 second-60 minutes are preferable, and 10 second-30 minutes are more preferable.

Polarized light irradiation can be performed using the apparatus of Unexamined-Japanese-Patent No. 2006-323060, for example. Moreover, on the formed coating film, a patterned alignment film can also be formed by repeatedly irradiating polarization | polarized-light, such as a linearly polarized ultraviolet-ray, for every area | region through the photomask corresponding to desired multiple area | region. As a photomask, what formed the light shielding pattern on films, such as quartz glass, soda-lime glass, or polyester, is used normally. The portion exposed to the light shielding pattern is blocked from being exposed to light, and the portion not covered is transmitted to the exposed light. Quartz glass is preferable at the point that the influence of thermal expansion is small. In view of the reactivity of the photo-alignment polymer, the light to be irradiated is preferably ultraviolet light.

The laminated body containing a patterned alignment film can be produced, for example by the following method.

(1) The 1st polarization which has a 1st polarization direction is irradiated to the coating film formed on the base material through the 1st photomask which has a space | gap part corresponding to a 1st pattern area (1st polarization irradiation). By 1st polarization irradiation, the 1st pattern area | region to which the orientation regulation force corresponding to the said 1st polarization direction was provided is formed.

(2) Irradiating a second polarized light having a polarization direction different from the first polarization direction (eg, a direction perpendicular to the first polarization direction) through a second photomask having a gap portion corresponding to the second pattern region. (Second polarized light irradiation). By 2nd polarization irradiation, the 2nd pattern area | region to which the orientation regulation force corresponding to the said 2nd polarization direction was provided is formed.

By performing the process of said (1) and (2) one or more times, the laminated body containing the patterned alignment film which has two or more pattern areas from which the direction of an orientation regulation force mutually differs can be obtained.

The film thickness of the alignment film is usually 10 nm to 10000 nm, preferably 10 nm to 1000 nm.

Since the laminated body of this invention contains the base material which has high adhesiveness, peeling from the base material of an oriented film can be suppressed. Adhesion can be evaluated by the adhesion test according to JIS-K5600. For example, the adhesion test may be performed using a commercially available device such as Cross Cut Guide I Series manufactured by Cotech Co., Ltd. (CCI-1, 1 mm interval, for 25 masses). For example, when the adhesion test of the laminate of the present invention is carried out using a crosscut guide I series manufactured by Cotech Co., Ltd. (CCI-1, 1 mm interval, for 25 masses), the mass in which the alignment film is maintained without peeling from the substrate is usually used. It is 9 or more of 25 masses, and 36% or more of an oriented film is maintained in the state which does not peel from a base material on an area basis.

An "optical film" means a film which can transmit light and has an optical function such as refraction and birefringence.

The optical film of this invention is a film in which the optically anisotropic layer is formed on the orientation film of the said laminated body, and expresses retardation.

An optically anisotropic layer can be formed, for example by orienting a liquid crystal compound. The formation of the optically anisotropic layer is preferably a composition for forming an optically anisotropic layer containing a liquid crystal compound. As a liquid crystal compound, a polymeric liquid crystal is preferable. The composition for optically anisotropic layer formation may contain 2 or more types of liquid crystal compounds (preferably polymeric liquid crystal).

As a polymerizable liquid crystal, the compound (it may be called "compound (X)" hereafter) containing the group represented by Formula (X) is mentioned.

P ¹¹ -B ¹¹ -E ¹¹ -B ¹² -A ¹¹ -B ^13- (X)

In the formula (X), P ¹¹ represents a polymerizable group.

A ¹¹ represents a divalent alicyclic hydrocarbon group or a divalent aromatic hydrocarbon group. The hydrogen atom contained in the bivalent alicyclic hydrocarbon group and the divalent aromatic hydrocarbon group may be substituted with a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a cyano group or a nitro group, The hydrogen atom contained in the alkyl group of 6 and the said C1-C6 alkoxy group may be substituted by the fluorine atom.

B ¹¹ is -O-, -S-, -CO-O-, -O-CO-, -O-CO-O-, -CO-NR ^16- , -NR ¹⁶ -CO-, -CO-,- CS- or a single bond is shown. R ¹⁶ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

B ¹² and B ¹³ are each independently -C≡C-, -CH = CH-, -CH ₂ -CH _2- , -O-, -S-, -C (= O)-, -C (= O ) -O-, -OC (= O)-, -OC (= O) -O-, -CH = N-, -N = CH-, -N = N-, -C (= O) -NR ^{16 -, -NR 16 -C (= O} ) -, -OCH 2 -, -OCF 2 -, -CH 2 O-, -CF 2 O-, -CH = CH-C (= O) -O-, - OC (= O) -CH = CH- or a single bond.

E <^11> represents a C1-C12 alkanediyl group, the hydrogen atom contained in this alkanediyl group may be substituted by the C1-C5 alkoxy group, and the hydrogen atom contained in the said alkoxy group may be substituted by the halogen atom. . In addition, -CH ₂ -constituting the alkanediyl group may be substituted with -O- or -CO-.]

It is preferable that carbon number of the aromatic hydrocarbon group and alicyclic hydrocarbon group of A <^11> is 3-18, It is more preferable that it is the range of 5-12, It is especially preferable that it is 5 or 6. As A ^{11, a} cyclohexane-1,4-diyl group and a 1,4-phenylene group are preferable.

E ¹¹ as is preferred alkanediyl group having 1 to 12 carbon atoms in the straight. -CH ₂ -constituting the alkanediyl group may be substituted with -O-.

Specifically, methylene group, ethylene group, propane-1,3-diyl group, butane-1,4-diyl group, pentane-1,5-diyl group, hexane-1,6-diyl group, heptane-1, 7-diyl group, octane-1,8-diyl group, nonane-1,9-diyl group, decane-1,10-diyl group, undecane-1,11-diyl group and dodecane-1,12-di C1-C12 linear alkanediyl groups, such as a diary; -CH ₂ -CH ₂ -O-CH ₂ -CH _2- , -CH ₂ -CH ₂ -O-CH ₂ -CH ₂ -O-CH ₂ -CH ₂ -and -CH ₂ -CH ₂ -O-CH ₂ -CH ₂ -O-CH ₂ -CH ₂ -O-CH ₂ -CH ₂ -and the like.

As the polymerizable group represented by P ¹¹ , since the polymerization reactivity, in particular, the photopolymerization reactivity is high, the radical polymerizable group or the cationic polymerizable group is preferable, and the polymerizable group is easy to handle and also the production of the liquid crystal compound itself is easy. It is preferable that it is group represented by (P-11)-a formula (P-15).

[In Formulas (P-11) to (P-15),

R ^{17 to} R ²¹ each independently represent an alkyl group having 1 to 6 carbon atoms or a hydrogen atom.]

Specific examples of the group represented by formulas (P-11) to (P-15) include groups represented by the following formulas (P-16) to (P-20).

It is preferable that P <^11> is group represented by Formula (P-14)-a formula (P-20), and a vinyl group, p-stilbene group, an epoxy group, or an oxetanyl group is more preferable.

It is more preferable that the group represented by P ¹¹ -B ¹¹ -is an acryloyloxy group or a methacryloyloxy group.

As compound (X), the compound represented by Formula (I), Formula (II), Formula (III), Formula (IV), Formula (V), or Formula (VI) is mentioned.

P ¹¹ -B ¹¹ -E ¹¹ -B ¹² -A ¹¹ -B ¹³ -A ¹² -B ¹⁴ -A ¹³ -B ¹⁵ -A ¹⁴ -B ¹⁶ -E ¹² -B ¹⁷ -P ¹² (I)

P ¹¹ -B ¹¹ -E ¹¹ -B ¹² -A ¹¹ -B ¹³ -A ¹² -B ¹⁴ -A ¹³ -B ¹⁵ -A ¹⁴ -F ¹¹ (II)

P ¹¹ -B ¹¹ -E ¹¹ -B ¹² -A ¹¹ -B ¹³ -A ¹² -B ¹⁴ -A ¹³ -B ¹⁵ -E ¹² -B ¹⁷ -P ¹² (III)

P ¹¹ -B ¹¹ -E ¹¹ -B ¹² -A ¹¹ -B ¹³ -A ¹² -B ¹⁴ -A ¹³ -F ¹¹ (IV)

P ¹¹ -B ¹¹ -E ¹¹ -B ¹² -A ¹¹ -B ¹³ -A ¹² -B ¹⁴ -E ¹² -B ¹⁷ -P ¹² (V)

P ¹¹ -B ¹¹ -E ¹¹ -B ¹² -A ¹¹ -B ¹³ -A ¹² -F ¹¹ (VI)

^Wherein A ^{12 to} A ¹⁴ are each independently synonymous with A ¹¹ , B ^{14 to} B ¹⁶ are each independently synonymous with B ¹² , B ¹⁷ is synonymous with B ^11, and E ¹² is synonymous with E ¹¹ .

F ¹¹ is a hydrogen atom, an alkyl group having 1 to 13 carbon atoms, an alkoxy group having 1 to 13 carbon atoms, a cyano group, a nitro group, a trifluoromethyl group, a dimethylamino group, a hydroxyl group, a methylol group, a formyl group, a sulfo group (-SO ₃ H ), A carboxy group, an alkoxycarbonyl group having 1 to 10 carbon atoms or a halogen atom, and -CH ₂ -constituting the alkyl group and the alkoxy group may be substituted with -O-.

As a specific example of a polymerizable liquid crystal, "3.8.6 network (complete crosslinking type)" of the liquid crystal handbook (Liquid Crystal Handbook Editing Committee edition, issued March 30, 2000), "6.5.1 liquid crystal material b. A compound having a polymerizable group among the compounds described in "Polymerizable nematic liquid crystal material", Japanese Patent Application Laid-Open No. 2010-31223, Japanese Patent Application Laid-Open No. 2010-270108, Japanese Patent Application Laid-Open No. 2011-6360, and Japanese Patent Publication No. 2011-207765 The polymeric liquid crystal compound of Unexamined-Japanese-Patents is mentioned.

Specific examples of the compound (X) include the following formulas (I-1) to (I-4), formulas (II-1) to (II-4), formulas (III-1) to (III-26), The compound represented by Formula (IV-1)-Formula (IV-19), Formula (V-1)-Formula (V-2), and Formula (VI-1)-Formula (VI-6) is mentioned. In addition, in the following formula, k1 and k2 respectively independently represent the integer of 2-12. These compounds (X) are preferable at the point of the ease of the synthesis | combination, or the availability.

The composition for optically anisotropic layer formation may contain a polymerization initiator, a polymerization inhibitor, a photosensitizer, a leveling agent, a chiral agent, a solvent, etc. in addition to the said liquid crystal compound. When a liquid crystal compound is a polymeric liquid crystal, it is preferable that the composition for optically anisotropic layer formation contains a polymerization initiator.

[Polymerization Initiator]

As a polymerization initiator, a photoinitiator is preferable and the photoinitiator which generate | occur | produces a radical by light irradiation is preferable.

As a photoinitiator, a benzoin compound, a benzophenone compound, a benzyl ketal compound, the (alpha)-hydroxy ketone compound, the (alpha)-amino ketone compound, a triazine compound, an iodonium salt, and a sulfonium salt are mentioned. Specifically, Irgacure 907, Irgacure 184, Irgacure 651, Irgacure 819, Irgacure 250, Irgacure 369 (above, are all manufactured by Chiba Japan Co., Ltd.), Sheikh All BZ , SAKE ALL Z, SAKE ALL BEE (all are manufactured by Seiko Chemical Co., Ltd.), Kayacure BP100 (Nippon Kayaku Co., Ltd.), Kayacure UVI-6992 (manufactured by Dausa), Adeka Optomer SP- 152, Adeka Optomeric SP-170 (above, all manufactured by ADEKA Co., Ltd.), TAZ-A, TAZ-PP (above, manufactured by Nippon Sieber Heg Co., Ltd.), and TAZ-104 (manufactured by Sanwa Chemical Co., Ltd.).

Content of the polymerization initiator in the composition for optically anisotropic layer formation is 0.1 mass part-30 mass parts normally with respect to 100 mass parts of polymeric liquid crystals (preferably compound (X)) contained in the composition for optically anisotropic layer formation, Preferably Preferably it is 0.5 mass part-10 mass parts. Within this range, the polymerizable liquid crystal can be polymerized without disturbing the orientation of the polymerizable liquid crystal.

[No Polymerization System]

The composition for optically anisotropic layer formation may contain the polymerization inhibitor in order to control the polymerization reaction of a polymeric liquid crystal.

As a polymerization inhibitor, Hydroquinone which has substituents, such as hydroquinone and an alkyl ether; Catechols having substituents such as alkyl ethers such as butyl catechol; Radical supplements such as pyrogallols and 2,2,6,6-tetramethyl-1-piperidinyloxy radicals; Thiophenols; (beta) -naphthylamine and (beta) -naphthol are mentioned.

By using a polymerization inhibitor, the stability of the optically anisotropic layer formed can be improved. Content of the polymerization inhibitor in the composition for optically anisotropic layer formation is 0.1 mass part-30 mass parts normally with respect to 100 mass parts of polymeric liquid crystal compounds, Preferably they are 0.5 mass part-10 mass parts. If it is in the said range, it can superpose | polymerize without disturbing the orientation of a polymeric liquid crystal.

[Photosensitizer]

As a photosensitizer, Xanthones, such as xanthone and thioxanthone; Anthracenes having substituents such as anthracene and alkyl ethers; Phenothiazine; Rubrene.

By using a photosensitizer, superposition | polymerization of a polymeric liquid crystal can be made highly sensitive. Content of a photosensitizer is 0.1 mass part-30 mass parts normally with respect to 100 mass parts of polymeric liquid crystals, Preferably they are 0.5 mass part-10 mass parts.

[Leveling Agent]

Examples of the leveling agent include organic modified silicone oil, polyacrylate and pafluoroalkyl leveling agents. Specifically, DC3PA, SH7PA, DC11PA, SH28PA, SH29PA, SH30PA, ST80PA, ST86PA, SH8400, SH8700, FZ2123 (above, manufactured by Toray Dow Corning Co., Ltd.), KP321, KP323, KP324, KP326, KP340, KP341 , X22-161A, KF6001 (above, all Shin-Etsu Chemical Co., Ltd.), TSF400, TSF401, TSF410, TSF4300, TSF4440, TSF4445, TSF-4446, TSF4452, TSF4460 (above, all moment performance materials Japan joint Company), Florinert (registered trademark) FC-72, copper FC-40, copper FC-43, copper FC-3283 (above, all Sumitomo 3M Co., Ltd.), mega park (registered trademark) R -08, East R-30, East R-90, East F-410, East F-411, East F-443, East F-445, East F-470, East F-477, East F-479, East F -482, copper F-483 (above, all manufactured by DIC Corporation), F-top (brand name) EF301, copper EF303, copper EF351, copper EF352 (all manufactured by Mitsubishi Material Denshi Chemical Co., Ltd.), supple Ron (registered trademark) S-381, S-382, S-383, S-393, SC-101, SC-105, KH-40, SA-100 (above, all AG C Seiko Chemical Co., Ltd., brand name E1830, copper E5844 (manufactured by Daikin Fine Chemical Co., Ltd.), BM-1000, BM-1100, BYK-352, BYK-353, BYK-361N (all : BM Chemie Co., Ltd.) is mentioned. You may use in combination of 2 or more type leveling agent.

By using a leveling agent, a smoother optically anisotropic layer can be formed. In addition, in the manufacturing process of an optically anisotropic layer, the fluidity | liquidity of the composition for optically anisotropic layer formation can be controlled, or the crosslinking density of an optically anisotropic layer can be adjusted. Content of a leveling agent is 0.1 mass part-30 mass parts normally with respect to 100 mass parts of polymeric liquid crystals, Preferably they are 0.1 mass part-10 mass parts.

[Chiral festival]

As a chiral agent, a well-known chiral agent (for example, a liquid crystal device handbook, Chapter 3 Section 4-3, a chiral agent for TN and STN, page 199, described in the 142nd chapter of the Japan Academic Society, 1989) is mentioned. have.

The chiral agent generally contains an asymmetric carbon atom, but an axially asymmetric compound or a surface asymmetric compound that does not contain an asymmetric carbon atom can also be used as the chiral agent. Examples of the layered asymmetric compound or the surface asymmetric compound include vinaphthyl, helicene, paracyclophane and derivatives thereof.

Specifically, Japanese Patent Publication No. 2007-269640, Japanese Patent Publication No. 2007-269639, Japanese Patent Publication No. 2007-176870, Japanese Patent Publication No. 2003-137887, Japanese Patent Publication No. 2000-515496, Japanese Patent Publication The compound as described in Unexamined-Japanese-Patent No. 2007-169178 and Unexamined-Japanese-Patent No. 9-506088 is mentioned, Preferably, it is paliocolor (trademark) LC756 by BASF Japan.

When using a chiral agent, the content is 0.1 mass part-30 mass parts normally with respect to 100 mass parts of polymeric liquid crystal compounds, Preferably they are 1.0 mass part-25 mass parts. If it is in the said range, when superposing | polymerizing a polymeric liquid crystal compound, it can suppress more disturbing the orientation of the polymeric liquid crystal compound.

[solvent]

It is preferable that the composition for optically anisotropic layer formation contains a solvent, especially an organic solvent, in order to make operability of manufacture of an optically anisotropic layer favorable. As an organic solvent, the organic solvent which can melt | dissolve the structural component of the composition for optically anisotropic layer formation, such as a polymeric liquid crystal compound, is preferable, and the solvent which can melt | dissolve the structural component of the composition for optically anisotropic layer formation, such as a polymeric liquid crystal compound. Moreover, the solvent which is inert to the polymerization reaction of a polymeric liquid crystal compound is more preferable. Specific examples include alcohol solvents such as methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, methyl cellosolve, butyl cellosolve, propylene glycol monomethyl ether, and phenol; Ester solvents such as ethyl acetate, butyl acetate, ethylene glycol methyl ether acetate, γ-butyrolactone, propylene glycol methyl ether acetate and ethyl lactate; Ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, methyl amyl ketone and methyl isobutyl ketone; Non-chlorinated aliphatic hydrocarbon solvents such as pentane, hexane and heptane; Non-chlorinated aromatic hydrocarbon solvents such as toluene and xylene; Nitrile solvents such as acetonitrile; Ether solvents such as tetrahydrofuran and dimethoxyethane; And chlorinated hydrocarbon solvents such as chloroform and chlorobenzene. You may use combining 2 or more types of organic solvents. Among them, alcohol solvents, ester solvents, ketone solvents, non-chlorinated aliphatic hydrocarbon solvents and non-chlorinated aromatic hydrocarbon solvents are preferable.

When the composition for optically anisotropic layer formation contains an organic solvent, 10 mass parts-10000 mass parts are preferable with respect to 100 mass parts of solid content, More preferably, it is 100 mass parts-5000 mass parts. Solid content concentration in the composition for optically anisotropic layer formation becomes like this. Preferably it is 2 mass%-50 mass%, More preferably, it is 5-50 mass%. "Solid content" means the sum total of the component except the solvent in the composition for optically anisotropic layer formation.

An unpolymerized film is formed by apply | coating the composition for optically anisotropic layer formation on the orientation film of the laminated body of this invention. When an unpolymerized film shows liquid crystal phases, such as a nematic phase, it has birefringence by monodomain orientation.

As a method of apply | coating the composition for optically anisotropic layer formation on an oriented film, the method similar to the application | coating method of the composition containing said photo-alignment polymer is mentioned. Among them, the coating by the CAP coating method, the inkjet method, the dip coating method, the slit coating method, the die coating method, and the bar coater, in that the composition for forming an optically anisotropic layer can be continuously applied on the alignment layer in a roll-to-roll format. The method is preferred. In the case of applying the composition in a roll-to-roll form, a composition containing a photo-alignment polymer is applied on the substrate to form an alignment film on the substrate, and also to form an optically anisotropic layer on the obtained alignment film. You may.

By superposing | polymerizing and hardening the polymeric liquid crystal compound contained in an unpolymerized film, the optical film, especially the film which has retardation property can be obtained. The optical film obtained in this way is fixed in the orientation of a polymeric liquid crystal compound, and it is hard to be influenced by the birefringence change by heat.

As a method of polymerizing a polymerizable liquid crystal compound, a photopolymerization method is preferable. According to the photopolymerization method, since polymerization can be performed at a low temperature, the selection range of the substrate to be used is widened in terms of heat resistance. The photopolymerization reaction is carried out by irradiating the unpolymerized film with visible light, ultraviolet light or laser light, and ultraviolet light is preferable.

Although light may be irradiated to a unpolymerized film as it is, it is preferable to irradiate light after drying a unpolymerized film and removing a solvent from the unpolymerized film. Although drying (solvent removal) may be performed in parallel with a polymerization reaction, it is preferable to remove most solvents before superposing | polymerizing. As a removal method of a solvent, the method similar to the drying method at the time of the formation of said orientation film is mentioned. Especially, natural drying or heat drying is preferable. The drying temperature is preferably in the range of 0 ° C to 250 ° C, more preferably in the range of 50 ° C to 220 ° C, and even more preferably in the range of 80 ° C to 170 ° C. The drying time is preferably 10 seconds to 60 minutes, more preferably 30 seconds to 30 minutes.

The optical film of this invention is useful as a phase difference plate used in order to convert linearly polarized light into circularly polarized light or elliptically polarized light, to convert circularly or elliptically polarized light into linearly polarized light, or to convert the polarization direction of linearly polarized light.

The optical film of this invention is excellent in transparency in visible region, and can be used as a member for various display apparatuses. Although the thickness of the optical film of this invention may be suitably adjusted according to the use or the phase difference value, It is preferable that it is 0.1 micrometer-10 micrometers, It is more preferable that it is 0.2 micrometer-5 micrometers from the point which makes photoelasticity small. .

Multiple optical films of the present invention may be laminated and used, or may be used in combination with other films. When used in combination with another film, it can be used as a viewing angle compensation film, a viewing angle expansion film, an antireflection film, a polarizing film (polarizing plate), a circularly polarizing film (circular polarizing plate), an elliptical polarizing film (elliptical polarizing plate), and a brightness improving film. .

The optical film of the present invention can change the optical properties according to the alignment state of the liquid crystal compound forming the optically anisotropic layer, the VA (vertical alignment) mode, IPS (in-plane switching) mode, OCB (optically compensated bend) mode It can be used as a phase difference plate for various liquid crystal display devices, such as a twisted nematic (TN) mode and a super twisted nematic (STN) mode.

In the optical film of the present invention, when the refractive index in the in-plane slow axis direction is n _x , the refractive index in the direction orthogonal to the in-plane slow axis (in the fast axis direction) is n _y , and the refractive index in the thickness direction is n _z , as follows. Can be classified.

Positive A plate with n _x > n _y ≒ n _z

Negative C plate of n _x ≒ n _y > n _z

Positive C plate with n _x ≒ n _y <n _z

Positive O plate and negative O plate of n _x ≠ n _y ≠ n _z

What is necessary is just to select the phase difference value of the optical film of this invention suitably in the range of 30-300 nm according to the display apparatus used.

When using the optical film of this invention as a broadband (lambda) / 4 plate, Re (549) may be adjusted to the range of 113-163 nm, Preferably you may adjust to 130-150 nm. When used as a broadband? / 2 plate, Re (549) may be adjusted in the range of 250 to 300 nm, preferably in the range of 265 to 285 nm. If the retardation value is the above-described value, there is a tendency that the polarization conversion can be uniformly performed for light of a wide range of wavelengths. The term "broadband λ / 4 plate" means a retardation film that expresses a 1/4 phase difference value with respect to light of each wavelength, and the term "wideband λ / 2 plate" means 1/2 of the light of each wavelength. The retardation film which expresses retardation value of means.

By adjusting content of the liquid crystal compound in the composition for optically anisotropic layer formation, the layer thickness of an optically anisotropic layer can be adjusted and the optical film which gives a desired phase difference can be produced. Since the phase difference value (retardation value, Re ((lambda))) of the optical film obtained is determined like Formula (4), in order to obtain desired Re ((lambda)), what is necessary is just to adjust (DELTA) n ((lambda)) and film thickness d suitably.

Re (λ) = d × Δn (λ) (4)

(In formula, Re (λ) represents the retardation value in the wavelength λnm, d represents the film thickness, and Δn (λ) represents the birefringence in the wavelength λnm.)

Since the optical film of this invention contains the base material which has high adhesiveness, it can suppress that the orientation film at the time of processing peels from a base material. Adhesion can be evaluated by the adhesion test according to JIS-K5600. For example, the adhesion test may be performed using a commercially available device such as Cross Cut Guide I Series manufactured by Cotech Co., Ltd. (CCI-1, 1 mm interval, for 25 masses). For example, when the adhesion test of the optical film of this invention is carried out using Cross Cut Guide I series (CCI-1, 1 mm space | interval, for 25 masses) by Cotech, an optically anisotropic layer and an orientation film do not peel from a base material. The mass to be maintained is usually 9 or more out of 25 masses, and on an area basis, 36% or more of the optically anisotropic layer and the alignment film are maintained in a state not to be peeled from the substrate.

In view of the simplification and cost of the manufacturing process, the optical film of the present invention preferably comprises an alignment film composed of an alignment polymer (preferably a photo-alignment polymer) and one type of additive, and the optically anisotropic layer is polymerized with the polymerizable liquid crystal. It is preferable that it consists of an initiator and a leveling agent.

The optical film of this invention is also useful as a member which comprises a polarizing plate. The polarizing plate of this invention contains at least one optical film of this invention.

As a specific example of a polarizing plate, the polarizing plate shown by FIG. 1 (a)-FIG. 1 (e) is mentioned. The polarizing plate 4a shown in FIG. 1 (a) is a polarizing plate in which the optical film 1 and the polarizing film layer 2 of the present invention are directly laminated, and the polarizing plate 4b shown in FIG. 1 (b) is the present invention. The optical film 1 and the polarizing film layer 2 are the polarizing plates bonded together through the adhesive bond layer 3 '. The polarizing plate 4c shown in FIG.1 (c) laminate | stacks the optical film 1 of this invention and the optical film 1 'of this invention, and also the optical film 1' and polarizing film layer of this invention. The polarizing plate 4d laminated with (2), and the polarizing plate 4d shown in FIG. 1 (d) is bonded to the optical film 1 of the present invention and the optical film 1 ′ of the present invention through the adhesive layer 3. Moreover, it is a polarizing plate which laminated | stacked the polarizing film layer 2 on the optical film 1 'of this invention. The polarizing plate 4e shown in Fig.1 (e) bonds the optical film 1 of this invention and the optical film 1 'of this invention through the adhesive bond layer 3, and also the optical film of this invention ( 1 ') and the polarizing film layer 2 are attached to each other via the adhesive layer 3'. "Adhesive" means a generic term for an adhesive and / or an adhesive.

The polarizing film layer 2 may be a film having a polarizing function, and a film obtained by adsorbing an iodine or a dichroic dye on a polyvinyl alcohol-based film and stretching a film and a polyvinyl alcohol-based film to adsorb iodine or a dichroic dye. Can be mentioned.

The polarizing film layer 2 may be protected by the protective film as needed. As a protective film, polyolefin films, such as polyethylene, a polypropylene, and norbornene-type polymer, a polyethylene terephthalate film, a polymethacrylic acid ester film, a polyacrylic acid ester film, a cellulose ester film, a polyethylene naphthalate film, a polycarbonate film, a polysulfone film , Polyether sulfone film, polyether ketone film, polyphenylene sulfide film and polyphenylene oxide film.

It is preferable that the adhesive agent used for the adhesive bond layer 3 and the adhesive bond layer 3 'is an adhesive with high transparency and excellent heat resistance. Such adhesives include acrylic adhesives, epoxy adhesives and urethane adhesives.

The flat panel display device of the present invention includes the optical film of the present invention. As said display apparatus, the liquid crystal display device provided with the liquid crystal panel in which the optical film of this invention and the liquid crystal panel were bonded, and the organic electroluminescent panel (henceforth "EL") panel with which the optical film and light emitting layer of this invention were bonded are used. And an organic EL display device to be provided. As an embodiment of the flat panel display device provided with the optical film of the present invention, a liquid crystal display device and an organic EL display device will be briefly described.

As a liquid crystal display device, the liquid crystal display devices 10a and 10b shown to FIG. 2 (a) and FIG. 2 (b) are mentioned. In the liquid crystal display device 10a illustrated in FIG. 2A, the polarizing plate 4 and the liquid crystal panel 6 of the present invention are bonded to each other via the adhesive layer 5. In the liquid crystal display device 10b shown in FIG. 2 (b), the polarizing plate 4 ′ of the present invention is formed on one surface of the liquid crystal panel 6 of the polarizing plate 4 of the present invention. On the other side, it has the structure joined via the contact bonding layer 5 and the contact bonding layer 5 ', respectively. In these liquid crystal display devices, the alignment of liquid crystal molecules is changed by applying a voltage to the liquid crystal panel using an electrode (not shown), thereby realizing monochrome display.

Examples of the organic EL display device include the organic EL display device 11 shown in FIG. 3. In the organic EL display device 11, the polarizing plate 4 and the organic EL panel 7 of the present invention are bonded to each other via the adhesive layer 5. The organic EL panel 7 is at least one layer made of a conductive organic compound. In such an organic EL display device, by applying a voltage to the organic EL panel using an electrode (not shown), the compound included in the light emitting layer of the organic EL panel emits light, thereby realizing monochrome display.

In the organic EL display device 11, the polarizing plate 4 is preferably a polarizing plate functioning as a broadband circular polarizing plate from the viewpoint of preventing reflection of external light on the surface of the organic EL display device 11.

Example

Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited by the following Example. In addition, in an example, "%" and "part" mean a mass% and a mass part, unless there is particular notice.

Synthesis Example of Photo-Oriented Polymer

Monomer represented by the formula (Z-a) is Macromol. Chem. Phys. 197, 1919-1935 (1996).

1.5 parts of monomers represented by formula (Z-a) and 0.1 parts of methyl methacrylate were dissolved in 16 parts of tetrahydrofuran. The obtained solution was heated at 60 degreeC for 24 hours, and reaction was performed. After cooling the obtained reaction mixture to room temperature, it was dripped in the mixed solution of toluene and methanol, and the copolymer represented by Formula (Z) was precipitated, and the copolymer represented by Formula (Z) was taken out. The number average molecular weight of the copolymer represented by formula (Z) was 33000. In the copolymer represented by the formula (Z), the content rate of the structural unit derived from the monomer represented by the formula (Z-a) was 75 mol%.

The polystyrene conversion number average molecular weight (Mn) of the copolymer represented by Formula (Z) was measured on condition of the following using GPC method.

Device; HLC-8220GPC (manufactured by Tosoh Corporation)

column; TOSOH TSKgel MultiporeH _XL -M

Column temperature; 40 ℃

menstruum; THF (tetrahydrofuran)

Flow rate; 1.0 mL / min

Detectors; RI

Calibration standards; TSK STANDARD POLYSTYRENE F-40, F-4, F-288, A-5000, A-500

[Preparation of composition]

After stirring the solution obtained by mixing each following component at 80 degreeC for 1 hour, it cooled to room temperature and prepared the composition for oriented film formation.

After stirring the solution obtained by mixing each component shown in Table 2 at 80 degreeC for 1 hour, it cooled to room temperature and prepared the composition for optically anisotropic layer formation.

In Table 1, a mixing ratio means the content rate of each component with respect to the whole composition prepared.

LR-9000 in Table 1 is Laromer (trademark) LR-9000 by BASF Japan.

In Table 2, a mixing ratio means the content rate of each component with respect to the whole composition prepared.

In Table 2, Irg369 is Irgacure 369 by BASF Japan, BYK361N is a leveling agent by Beek Chemical Japan, and LC242 is a liquid crystal compound by BASF represented by the following formula.

[Measurement of Water Contact Angle]

Using the atmospheric pressure plasma surface treatment apparatus (roll direct head type AP-T04S-R890) manufactured by Sekisui Chemical Co., Ltd., plasma is generated on condition of an output of 60 W (equivalent to energy of 100 mJ / cm 2) and saponified. The triacetyl cellulose film surface was processed. The water contact angle of the surface to which the plasma process was performed was measured by the droplet method (liquid amount: 1.1 microliters) using DropMaster700 by Kyowa Kaimen Chemical Co., Ltd .. Similarly, the water contact angle was measured similarly about the saponified triacetylcellulose film surface-treated on the conditions of 300 W of output (equivalent to 500 mJ / cm <2> of energy). The results are shown in Table 3.

Example 1 [Production Example 1 of Optical Film of the Present Invention]

The output 44W (in the atmosphere (volume ratio nitrogen: oxygen = 99.9: 0.1) containing nitrogen and oxygen) using the atmospheric pressure plasma surface treatment apparatus (roll direct head type AP-T04S-R890) manufactured by Sekisui Chemical Co., Ltd. Plasma was generated under conditions of 74 mJ / cm 2) to treat the saponified triacetylcellulose film surface. The composition for oriented film formation prepared above was apply | coated to the surface which carried out the plasma processing, it dried, and the film of thickness 300nm was formed. Subsequently, using a spotcure (SP-7, manufactured by Ushio Denki Co., Ltd.) with polarized ultraviolet light (polarization UV) irradiation jig in the vertical direction with respect to the surface of the formed film, for 5 minutes at an illuminance of 15 mW / cm 2. Linearly polarized light UV was irradiated to form an alignment film. The composition for optically anisotropic layer formation prepared above was apply | coated to the surface which irradiated the polarization UV using the bar coater, it heated at 120 degreeC, and the unpolymerized film was formed on the orientation film. After cooling to room temperature, polymerization was carried out by irradiating UV light with a roughness of 40 mW / cm 2 at a wavelength of 365 nm using UniCure (VB-15201BY-A, manufactured by Ushio Denki Co., Ltd.) to obtain an optical film (X). Made.

Comparative Example 1 [Manufacture Example 1 of Comparative Optical Film]

In the said Example 1, it carried out on the conditions similar to the said Example 1 except having set the conditions of plasma surface treatment into 300 W (equivalent to 500 mJ / cm <2> energy), and produced the comparative optical film 1. .

[Adhesive evaluation]

According to JIS-K5600, the above-mentioned optical film (X) and the comparative optical film (1) produced using the Cotech Co., Ltd. crosscut guide I series (CCI-1, 1 mm interval, for 25 masses) Peel resistance was evaluated. Table 4 shows the results of counting the remaining number of alignment films held without peeling after the peeling test.

[Measurement of Optical Properties]

The phase difference value of the optical film (X) produced above and the comparative optical film (1) was measured with the measuring device (KOBRA-WR, the product made by Ohshi Keisokukiki Co., Ltd.). The retardation value Re (λ) was measured at a wavelength λ of 549 nm. The results are shown in Table 4.

The optical film produced in the Example was able to confirm the tendency which was excellent in adhesiveness.

Since the base material of this invention is excellent in adhesiveness, the optical film in which peeling at the time of processing was suppressed can be produced.

1, 1 ': optical film of the present invention
2: polarizing film layer
3, 3 ': adhesive layer
4a, 4b, 4c, 4d, 4e, 4, 4 ': polarizing plate of the present invention
5, 5 ': adhesive layer
6: liquid crystal panel
7: organic EL panel
10a and 10b: liquid crystal display device
11: organic EL display

Claims (14)

The base material whose water contact angle in 25 degreeC of a base material surface is 15 degrees-30 degrees. The substrate of claim 1 wherein the substrate is a saponified triacetylcellulose substrate. The substrate according to claim 1 or 2, wherein the substrate is a substrate subjected to surface treatment in an atmosphere containing nitrogen and oxygen. The substrate of claim 3, wherein the surface treatment is a plasma treatment. The laminated body in which the alignment film was formed in the surface of the base material in any one of Claims 1-4. The laminate according to claim 5, wherein the alignment film is an alignment film formed of a photoalignable polymer. The laminate according to claim 6, wherein the photo-alignment polymer is a photo-alignment polymer capable of forming a crosslinked structure by light irradiation. The optical film in which the optically anisotropic layer was formed on the orientation film of the laminated body as described in any one of Claims 5-7. The optical film according to claim 8, wherein the optically anisotropic layer is formed by polymerizing one or more polymerizable liquid crystals. The optical film according to claim 8 or 9 having retardation. The polarizing plate containing the optical film as described in any one of Claims 8-10. Retardation plate containing the optical film of Claim 10. The flat panel display device provided with the optical film as described in any one of Claims 8-10. The manufacturing method of the optical film containing the following process (1)-(4).
Process (1): The process of apply | coating a photo-alignment polymer on the base material as described in any one of Claims 1-4.
Step (2): a step of forming an alignment film by crosslinking the photo-alignment polymer on the substrate
Process (3): The process of further apply | coating the composition containing a polymeric liquid crystal on an oriented film, and forming a coating film.
Step (4): A step of polymerizing the polymerizable liquid crystal in the coating film to form an optical film.

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