WO2014030926A1

WO2014030926A1 - Optical anisotropic film

Info

Publication number: WO2014030926A1
Application number: PCT/KR2013/007498
Authority: WO
Inventors: 이성경; 유동우; 전성호; 최대승
Original assignee: 주식회사 엘지화학
Priority date: 2012-08-21
Filing date: 2013-08-21
Publication date: 2014-02-27

Abstract

The present invention relates to: an optical anisotropic film capable of more effectively aligning liquid crystals of a liquid crystal layer by using a photoalignment layer and showing remarkable liquid crystal alignment stability and excellent interaction between a liquid crystal layer and a photoalignment layer; and an optical device comprising the same. The optical anisotropic film comprises: a substrate having a polarity (P) defined by the predetermined equation of 0.01-0.35; a photoalignment layer on the substrate in which at least a part of photoreactors comprise a photoaligned photoalignable polymer and said P is 0.02-0.28; and a liquid crystal layer on the photoalignment layer.

Description

【Specification】

[Name of invention]

Optically anisotropic film

[Technical Field]

The present invention relates to an optically anisotropic film. More specifically, the present invention is an optically anisotropic film that can more effectively orientate the liquid crystal of the liquid crystal layer using the optical alignment layer, and exhibits excellent liquid crystal alignment stability and excellent interaction between the liquid crystal layer and the photoalignment layer and the same It relates to an optical element included.

Background Art

In recent years, as the size of liquid crystal displays has increased, the use of mobile phones and laptops has been gradually extended to home use such as wall-mounted TVs. Therefore, high definition, high quality, and wide viewing angles are required for liquid crystal displays. In particular, the thin film transistor liquid crystal display (TFT-LCD) driven by the thin film transistor independently drives individual pixels, so that the response speed of the liquid crystal is very high and a high quality moving image can be realized.

In order to use a liquid crystal as an optical switch in such a TFT-LCD, the liquid crystal must be initially oriented in a predetermined direction on a layer on which the innermost thin film transistor is formed, and an alignment layer is used for this purpose. In particular, in recent years, the application of the photo-alignment method of orienting the alignment film by light such as UV has been widely studied.

In general, for such an optical alignment, a photoalignment film including a photoalignment polymer is formed under the liquid crystal layer, and the photoalignment film is irradiated with linearly polarized UV to cause a photoreaction. As a result, photo-alignment occurs in which the main chain of the photo-alignment polymer is arranged in a predetermined direction, and the liquid crystal included in the upper liquid crystal layer may be aligned under the influence of the alignment layer.

Therefore, in order to more effectively align the liquid crystal of the liquid crystal layer by using the photo-alignment method, the photo-alignment layer itself should not only exhibit excellent orientation. In addition, the bonding force or interaction between the photo-alignment layer and the liquid crystal layer needs to occur well. In addition, the liquid crystal once oriented needs to exhibit excellent orientation stability.

[Content of invention]

[Problem to solve]

Accordingly, the present invention provides an optically anisotropic film which can align the liquid crystal of the liquid crystal layer more effectively by using an optical alignment film, and exhibit excellent liquid crystal alignment stability and an excellent interaction between the liquid crystal layer and the optical alignment layer. to be.

The present invention also provides an optical element comprising the optically anisotropic film.

[Measures of problem]

The present invention is a substrate (P) polarity is defined by the following formula 1 is 0.01 to 35; At least some photoreactor comprising a photoalignable polymer with a photoalignment, wherein the photoalignment film on the substrate having a polarity (P) of 0.02 to 0.28 defined by Equation 1 below; And it provides an optically anisotropic film comprising a liquid crystal layer on the optical alignment film:

[Equation 1]

P (polarity) = IFT (s, P) / IFT (s)

In Equation 1, IFT (s, P) and IFT (s) are water drops and diiodo measured by placing 10 ^ drops of water and diiodomethane drops on the surface of the substrate or photoalignment film. The contact angle of the methane drop is calculated by substituting the Owens-Wendt-Rabel-Kaelble equation.

The present invention also provides an optical element comprising the optically anisotropic film. Hereinafter, an optically anisotropic film and an optical device according to embodiments of the present invention will be described.

According to an embodiment of the present invention, a substrate having a polarity (P) defined by Equation 1 below 0.01 to 0.35; At least a part of the photoreaction groups includes a photo-aligned photo-aligned polymer, and the substrate phase having a polarity (P) of 0.02 to 0.28 defined by Equation 1 below. Photo-alignment film; And an optically anisotropic film comprising a liquid crystal layer on the photoalignment film:

[Equation 1]

P (polarity) = IFT (s, P) / IFT (s)

In Equation 1, IFT (s, P) and IFT (s) are measured by placing 10 drops of water and diiodomethane drops on the surface of the substrate or photo-alignment film. It is calculated by substituting the contact angle of methane drop into Owens-Wendt-Rabel-Kaelble equation.

As a result of the researches of the present inventors, by optimizing the surface energy after photoalignment of the photoalignment film, the alignment of the liquid crystal molecules in the upper liquid crystal layer with the photoalignment film can be more effectively oriented, and the liquid crystal molecules in the liquid crystal layer It was confirmed that it can stably maintain an excellent orientation state. In particular, by optimizing the polarity P (polarity) value defined by Equation 1 among the surface energy, the interaction and bonding force between the photoalignment film and the liquid crystal layer can be further improved, and as a result, the liquid crystal layer It was confirmed that the liquid crystal molecules in the present invention can be more effectively aligned, and that the aligned liquid crystal molecules can exhibit more improved orientation stability.

The polarity (P) value, as shown in Equation 1 above, corresponds to the Owens-Wendt-Rabel-Kaelble equation for the contact angle of water droplets and diiodomethane chamber on the surface of the substrate or photo-alignment layer. It can derive and measure as ratio of IFT (s, P) and IFT (s) which were calculated and received. At this time, the contact angle of the water droplets and diiodomethane droplets is about 15 to 25 ^° C, at a room temperature of about 10 / water drops and about 4 / ^ diiodomethane droplets on the surface of the substrate or photoalignment film (For example, after each liquid room is lightly taken and formed and placed on a substrate or photo-alignment film surface), and a sessile drop of a contact portion between the substrate or photo-alignment film surface and each liquid drop is formed. It can be measured by the method of. At this time, the measurement of the contact angle can be measured by a Drop Shape Analysis measuring device (DSA; for example, measuring device such as trade name DSA 100). In this way, the contact angles of water drops and diiodomethane drops are measured, and the measured values are substituted into the Owens-Wendt-Rabel-Kaelble equation. Characteristic values of IFT (s, P) and IFT (s) with respect to the substrate or photo-alignment film surface can be calculated, and the polarity P value for the substrate or photo-alignment film can be derived as a ratio of these characteristic values. Can be.

The polarity P value may reflect the degree of polarity of the surface of the substrate or the optical alignment layer. As the polarity (P) value of the surface of the substrate and the photoalignment layer is optimized, the surface energy of the liquid crystal layer underlying structure (ie, the substrate and the photoalignment layer) may be optimized to improve the bonding force between the liquid crystal layer and the photoalignment layer. It has been confirmed that this can lead to improved interaction between the photo-aligned photo-alignment polymer and the liquid crystal molecules, thereby exhibiting the excellent liquid crystal alignment and liquid crystal alignment stability described above.

The optimized surface energy of the above-described liquid crystal layer underlying structure includes a substrate having an optimized polarity value of about 0.01 to 0.35 and an optical alignment film having an appropriate polarity value of about 0.02 to 0.28. By combining, it can be achieved. In a more specific example, when the substrate is applied with a P (polarity) value of about 0.01 to 0.03, an optimized surface energy can be achieved by combining an optical alignment film having a P (polarity) value of about 0.06 to 0.28, In another example, when the substrate is applied with a P (polarity) value of about 0.30 to 0.35, an optimized surface energy may be achieved by combining an optical alignment film having a P (polarity) value of about 0.02 to 0.2. Accordingly, the surface energy of the lower structure of the liquid crystal layer including the substrate and the optical alignment layer may be optimized to exhibit the excellent liquid crystal alignment and liquid crystal alignment stability described above. Optimized polarity (P) values of the substrate and the photo-alignment layer may be achieved depending on the selection of a suitable substrate and the photo-alignment polymer, the selection of a suitable binder compound which may be added to the photo-alignment layer, and an appropriate composition ratio of the photo-alignment polymer and the binder compound, respectively. .

Hereinafter, the configuration of the optically anisotropic film of one embodiment for achieving the optimized P (polarity) value of the substrate and the optical alignment layer will be described in more detail.

First, as the base material having the appropriate P (polarity) value, a cellulose-based base material such as a cellulose-based base material such as a triacetyl cellulose (TAC) base, or a cyclic lepin It may be a polymer (cyclic olefin polymer; COC) substrate, PET substrate or cyclic olefin copolymer (COP) substrate and the like.

For example, a salose based substrate such as triacetyl salose based may have a P (polarity) value of about 0.30 to 0.35, or about 0.31 to 0.32, while such a cell based substrate is used. By using a suitable optical orientation polymer or binder compound described below, or mixing the photoalignment polymer and the binder compound in an appropriate composition ratio, the P (polarity) value of the photo alignment layer is adjusted to about 0.02 to 0.2, An optimized surface energy can be achieved.

As another example, the cyclic olefin polymer or copolymer substrate or PET substrate may have a polarity (P) value of about 0.01 to 0.03, or about 0.01 to 0.02. By using a binder compound or by mixing the photo-alignment polymer and the binder compound in an appropriate composition ratio, the P (polarity) value of the photo-alignment film is adjusted to about 0.06 to 0.28, thereby improving the previously optimized surface energy. Can be achieved. Among the cyclic olefin polymers or copolymer substrates or PET substrates, an appropriate P (polarity) value can be achieved by appropriately using a cyclic olefin copolymer (COP) substrate.

As already mentioned above, by achieving such optimized surface energy, the optically anisotropic film of one embodiment can exhibit excellent liquid crystal alignment and liquid crystal alignment stability.

Meanwhile, the photoalignment layer may include, for example, a photoalignment polymer including repeating units represented by the following Chemical Formula 1 or 2 so that the photoalignment layer may exhibit an appropriate P (polarity) value of about 0.02 to 0.28: [Formula 1] [Formula 2]

In Chemical Formulas 1 and 2,

n is 50 to 5,000,

p is an integer from 0 to 4,

At least one of Ri, R ₂ , R ₃ , and R 4 is a radical selected from the group consisting of the formulas la to le, and the others may be the same as or different from each other, and each independently hydrogen; halogen; Substituted or unsubstituted alkyl having 1 to 20 carbon atoms; Substituted or unsubstituted alkenyl having 2 to 20 carbon atoms; Substituted or unsubstituted cycloalkyl having 5 to 12 carbon atoms; Substituted or unsubstituted aryl having 6 to 40 carbon atoms; Substituted or unsubstituted aralkyl having 7 to 15 carbon atoms; Substituted or unsubstituted alkynyl having 2 to 20 carbon atoms; Or a polar functional group selected from the group consisting of non-hydrocarbonaceous polar groups containing one or more elements selected from the group consisting of oxygen, nitrogen, phosphorus, sulfur, silicon and boron,

[Formula la]

[Formula le]

In the above formula la to le,

nl is an integer from 0 to 4, n2 is an integer from 0 to 5, 1 is 0 or

1,

A is substituted or unsubstituted alkylene having 1 to 20 carbon atoms, carbonyl, carboxy, substituted or unsubstituted arylene having 6 to 40 carbon atoms, or a simple bond,

B is a simple bond; Substituted or unsubstituted alkylene having 1 to 20 carbon atoms; Carbonyl; Carboxy; ester; Substituted or unsubstituted alkoxylene having 1 to 10 carbon atoms; Substituted or unsubstituted arylene having 6 to 40 carbon atoms; And substituted or unsubstituted heteroarylene having 6 to 40 carbon atoms,

D and D, each independently a simple bond; Oxygen; Substituted or unsubstituted alkylene having 1 to 20 carbon atoms; Substituted or unsubstituted cycloalkylene having 3 to 12 carbon atoms; And it is selected from the group consisting of substituted or unsubstituted alkylene oxide having 1 to 20 carbon atoms,

E is a simple bond; Substituted or unsubstituted alkylene having 1 to 20 carbon atoms; Or a substituted or unsubstituted arylene oxide having 6 to 40 carbon atoms,

X is oxygen or sulfur,

Y and Z are each independently hydrogen; Or substituted or unsubstituted alkyl having 1 to 20 carbon atoms,

P is a simple bond; Substituted or unsubstituted alkylene having 1 to 20 carbon atoms; Carbonyl; Substituted or unsubstituted alkenylene having 2 to 20 carbon atoms; Substituted or unsubstituted cycloalkylene having 3 to 12 carbon atoms; Substituted or unsubstituted arylene having 6 to 40 carbon atoms; Substituted or unsubstituted aralkylene having 7 to 15 carbon atoms; Substituted or unsubstituted alkynylene having 2 to 20 carbon atoms; And substituted or unsubstituted cycloalkylene having 4 to 8 carbon atoms,

R ₁₀ , R „, R ₁₂ , R ₁₃ and R ₁₄ are the same as or different from each other, and each independently hydrogen; halogen; Substituted or unsubstituted alkyl having 1 to 20 carbon atoms; Substituted or unsubstituted cycloalkyl having 4 to 8 carbon atoms; Substituted or unsubstituted alkoxy having 1 to 20 carbon atoms; Substituted or unsubstituted aryloxy having 6 to 30 carbon atoms; Substitution or ratio Substituted aryl having 6 to 40 carbon atoms; Substituted or unsubstituted aralkyl having 6 to 40 carbon atoms; Heteroaryl having 6 to 40 carbon atoms containing a group 14, 15 or 16 hetero element; Substituted or unsubstituted alkoxy aryl having 6 to 40 carbon atoms; Cyano; Nitrile; Nitro; And hydroxy is selected from the group consisting of,

R ₁₅ is one or two substituents, each independently hydrogen; halogen; Cyano; Substituted or unsubstituted alkyl having 1 to 20 carbon atoms; Substituted or unsubstituted alkoxy having 1 to 20 carbon atoms; Substituted or unsubstituted aryloxy of 6 to 30 carbon atoms; Substituted or unsubstituted aryl having 6 to 40 carbon atoms; Heteroaryl having 6 to 40 carbon atoms including a hetero element of Group 14, 15 or 16; And substituted or unsubstituted alkoxy aryl having 6 to 40 carbon atoms.

Such photo-oriented polymers have a structure in which a norbornene-based main chain structure is bonded to one or more photo-groups, for example, cinnamate-based functional groups, chalcone-based functional groups, azo-based functional groups or coumarin-based functional groups. In addition, due to the structure in which the photobanung group is bonded to the end of the norbornene-based backbone and the type and structure of the photoreactor itself, an appropriate P (polarity) value of the above-described photoalignment layer, for example, about 0.02 to It enables to achieve a P (polarity) value of 0.28.

In one example, when a TAC round salose based substrate having a P (polarity) value of about 0.30 to 0.35, or about 0.31 to 0.32 is applied, the photo-alignment polymer may be bulky containing alkoxy or alkoxyaryl at the end of the photoreactor. Having a structure in which one functional group is bonded, for example, in the photoreaction group of the formula la to le, one or more of R10 to R14 is substituted or unsubstituted alkoxy having 1 to 20 carbon atoms or substituted or unsubstituted carbon number 6 to 40 alkoxy aryl or the like. More specifically, the photo-alignment polymerizer has a light band recess of the formula la, and only a single repeating unit of Formula 1 in which position 4 of the terminal benzene ring, ie, R14 is alkoxy having 1 to 5 carbon atoms such as methoxy It may be a homopolymer containing. Accordingly, it may be easier to adjust the P (polarity) value of the photo alignment layer to an appropriate range of about 0.02 to 0.2.

Further, in another example, a cyclic olefin polymer or copolymer such as COC or COP having a P (polarity) value of about θΐ to 0.03, or about 0.01 to 0.02 When a substrate or PET substrate is applied, the photo-alignment polymer has a structure in which a bulky functional group including halogen or aralkyl is bonded at the end of the photoreaction group, for example, in the photoreactor of Formula la to le, R10 At least one of R14 may be halogen or alkyl substituted with 1 to 20 carbon atoms substituted with halogen, or substituted or unsubstituted aralkyl having 6 to 40 carbon atoms and the like. More specifically, the photo-alignment polymer has a light band recess of the formula la, the 4th position of the terminal benzene ring, that is, R14 is halogen, such as fluoro, D, D, is a simple bond, 1 is 0 It can be a single polymer comprising only a single repeating unit of the formula (1) (that is, there is no linker between the photoreactor of formula la and the main chain of formula 1). Accordingly, the P (polarity) value of the photoalignment film can be more easily achieved in the appropriate range of about 0.06 to 0.28.

As a result, the optimized surface energy of the above-described liquid crystal layer substructure is achieved, so that the optically anisotropic film of one embodiment may exhibit excellent liquid crystal alignment and liquid crystal alignment stability.

On the other hand, as a photo-alignment polymer including the above-described repeating unit of Formula 1 or 2, Korean Patent Publication Nos. 1002763, 0789247, 0671753, 0982394, 0946552, 0955569, Korea What is disclosed in Unexamined-Japanese-Patent No. 2009-0037740, 2009-0047720, 2012-0044883, etc. can be used, and can be easily manufactured by a person skilled in the art by the method disclosed in these documents.

In addition, in the repeating units of Formulas 1 and 2, the non-hydrocarbonaceous polar group may be selected from the group consisting of the following functional groups, and in addition to the various polar functional groups:

-OR ₆ , -OC (0) OR ₆ , -R ₅ OC (0) OR ₆ , -C (0) OR ₆ , -R ₅ C (0) OR _6, -C (0) R ₆ ,-

R ₅ C (0) R ₆ , -OC (0) R ₆ , -R ₅ OC (0) R ₆ ,-(R ₅ 0) _k -OR ₆ ,-(OR ₅ ) _k -OR ₆ , -C (0) -0-C (0) R ₆ ,-R ₅ C (0) -0-C (0) R ₆ , -SR ₆ , -RjSRe, -SSR ₆ , -R ₅ SSR ₆ , -S ( R = ₆ , -R ₅ S (= 0) R ₆ ,-R ₅ C (= S) R _6- , -R ₅ C (= S) SR ₆ , -R ₅ S0 ₃ R ₆ , -S0 ₃ R ₆ , -R ₅ N = C = S, -N = C = S, -NCO, -R5-NCO,

ι

( ^{, 5: 2 (5} , 0H.N, ⁵ N0CSNNSRCCNNRNCN-,-=-=,- ζι

Z.00 / Cl0Za¾ / X3d 9Z60 £ 0 / M0Z OAV

: 0 OR c .6 .: pR ₆

-F - eu 0 eu ^'CB ₂ - GH; eu CH ₂ - R ₅ eu - eu Si- OR

F½

ci- I /-

-NH ₂ ⁺一 R ₅ — N ᅳ R ₅ — Si— R ₇ or

In the polar functional group, R ₅ is the same as or different from each other, and each independently halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, haloaralkyl, Linear or branched alkylene having 1 to 20 carbon atoms unsubstituted or substituted with one or more substituents selected from alkoxy, haloalkoxy, carbonyloxy, halocarbonyloxy, aryloxy, haloaryloxy, silyl and siloxy; Halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, halo aryl, aralkyl, haloaralkyl, alkoxy, haloalkoxy, carbonyloxy, halocarbonyl oxy, aryloxy, Linear or branched alkenylene of 2 to 20 carbon atoms unsubstituted or substituted with one or more substituents selected from haloaryloxy, silyl and siloxy; Halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, halo, aralkyl, alkoxy, ^haloalkoxy, carbonyl-oxy, halo, carbonyl, aryloxy A linear or branched alkynylene having 3 to 20 carbon atoms unsubstituted or substituted with one or more substituents selected from haloaryloxy, silyl, and siloxy; Halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, halo aryl, aralkyl, haloaralkyl, alkoxy, haloalkoxy, carbonyloxy, halocarbonyl oxy, aryloxy, Cycloalkylene having 3 to 12 carbon atoms unsubstituted or substituted with one or more substituents selected from haloaryloxy, silyl, and siloxy; Halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, haloaralkyl, alkoxy, haloalkoxy, carbonyloxy, halocarbonyloxy, aryloxy, Arylene having 6 to 40 carbon atoms unsubstituted or substituted with one or more substituents selected from haloaryloxy, silyl, and siloxy; Halogen, alkyl, alkenyl, alkynyl, haloal At least one selected from ke, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, haloaralkyl, alkoxy haloalkoxy, carbonyloxy, halocarbonyloxy, aryloxy, haloaryloxy, silyl and siloxy Alkoxylene having 1 to 20 carbon atoms unsubstituted or substituted with a substituent; Or halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, haloaralkyl, alkoxy, haloalkoxy. Carbonyloxyylene having 1 to 20 carbon atoms unsubstituted or substituted with one or more substituents selected from carbonyloxy, halocarbonyloxy, aryloxy, haloaryloxy, silyl and siloxy, R ₆ , R ₇ and R ₈ is the same as or different from each other, and each independently hydrogen; halogen; Halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, haloaralkyl, alkoxy, haloalkoxy, carbonyloxy _: halocarbonyloxy, aryloxy, Linear or branched alkyl having 1 to 20 carbon atoms unsubstituted or substituted with one or more substituents selected from haloaryloxy, silyl and siloxy; Halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, haloaralkyl, alkoxy, haloalkoxy, carbonyloxy, halocarbonyloxy, aryloxy, Linear or branched alkenyl of 2 to 20 carbon atoms unsubstituted or substituted with one or more substituents selected from haloaryloxy, silyl and siloxy; Halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, halo aryl, aralkyl, haloaralkyl, alkoxy, haloalkoxy, carbonyloxy, halocarbonyl oxy, aryloxy, Linear or branched alkynyl having 3 to 20 carbon atoms unsubstituted or substituted with one or more substituents selected from haloaryloxy, silyl and siloxy; Halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, haloaralkyl, alkoxy, haloalkoxy, carbonyloxy, halocarbonyloxy, aryl Cycloalkyl having 3 to 12 carbon atoms unsubstituted or substituted with one or more substituents selected from oxy, haloaryloxy, silyl, and siloxy; Halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, haloaralkyl, alkoxy, haloalkoxy, carbonyloxy, halocarbonyloxy, aryloxy Aryl having 6 to 40 carbon atoms substituted or unsubstituted with one or more substituents selected from haloaryloxy, silyl, and siloxy; Halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, haloaralkyl, alkoxy, halo Alkoxy having 1 to 20 carbon atoms or unsubstituted or substituted with one or more substituents selected from roalkoxy, carbonyloxy, halocarbonyloxy, aryloxy, haloaryloxy, silyl and siloxy; Or halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, halo alkynyl, aryl, haloaryl, aralkyl, haloaralkyl, alkoxy, haloalkoxy, carbonyl oxy, halocarbonyloxy, aryloxy , Carbonyl substituted or unsubstituted with one or more substituents selected from haloaryloxy, silyl and siloxy, and carbon is 1 to 20 carbon atoms, each independently an integer of 1 to 10.

In addition, in the repeating units of Formulas 1 and 2, a hetero aryl group having 6 to 40 carbon atoms, or an aryl group having 6 to 40 carbon atoms containing a hetero element of Group 14, 15 or 16, from the group consisting of the following functional groups It may be one or more selected, but is not limited to:

In the above formula, at least one of ^ ， ^ ， ^ ^^ ^^！ ^^ ， ^^！？， and R ′ ₁₈ is substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, or substituted or unsubstituted carbon atoms 6 To 30 aryloxy, the remainder may be the same or different, each independently substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted C 6 Aryloxy of 30 to 30, or substituted or unsubstituted aryl having 6 to 40 carbon atoms. The above-described photoalignable polymer may be a single polymer composed of a single repeating unit such as the repeating unit of Formula 1 or 2, or may be a copolymer including two or more repeating units.

In addition, in the structure of the photo-orientation polymer described above, each substituent may be defined as follows: First, "alkyl" means a linear or branched saturated monovalent hydrocarbon moiety of 1 to 20, preferably 1 to 10, more preferably 1 to 6 carbon atoms. The alkyl group may encompass not only unsubstituted but also further substituted by a certain substituent described below. Examples of alkyl groups include methyl, ethyl, propyl, 2-propyl, n-butyl, iso-butyl, tert-butyl, pentyl, nucleus, dodecyl, fluoromethyl, difluoromethyl, trifluoromethyl, chloromethyl , Dichloromethyl, trichloromethyl, iodomethyl, bromomethyl and the like.

"Alkenyl" means a linear or branched monovalent hydrocarbon moiety of 2 to 20, preferably 2 to 10, more preferably 2 to 6 carbon atoms comprising at least one carbon-carbon double bond. do. Alkenyl groups may be bonded through a carbon atom comprising a carbon-carbon double bond or through a saturated carbon atom. Alkenyl groups may be broadly referred to as unsubstituted as well as those further substituted by the following substituents. Examples of the alkenyl group include ethenyl, 1-propenyl, 2-propenyl, 2-butenyl, 3-butenyl, pentenyl, 5-nuxenyl, dodecenyl, and the like.

"Cycloalkyl" refers to a saturated or unsaturated non-aromatic monovalent monocyclic, bicyclic or tricyclic hydrocarbon moiety of 3 to 12 ring carbons, which is further encompassed further by certain substituents described below. can do. For example, cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclo nuclear chamber, cyclonuxenyl, cycloheptyl, cyclooctyl, decahydronaphthalenyl, adamantyl, norbornyl (ie, bicyclo [ ² , ² , 1 ] Hept- ⁵ -enyl), etc. are mentioned.

"Aryl" means a monovalent monocyclic, bicyclic or tricyclic aromatic hydrocarbon moiety having from 6 to 40, preferably from 6 to 12 ring atoms, further substituted by certain substituents described below. It may also refer generically. Examples of the aryl group include phenyl, naphthalenyl, fluorenyl and the like.

"Alkoxyaryl" means that at least one hydrogen atom of the aryl group as defined above is substituted with an alkoxy group. Examples of the alkoxyaryl group are methoxyphenyl, epoxyphenyl, propoxyphenyl, appendoxyphenyl, pentoxyphenyl, nucleooxyphenyl, hepoxy, oxoxy, nanoxy, methoxybiphenyl, methoxynaphthalenyl, Mesoxyfluorenyl or methoxyan Trasenyl etc. are mentioned.

"Aralkyl" means that at least one hydrogen atom of the alkyl group as defined above is substituted with an aryl group, and may be referred to collectively further substituted by a specific substituent described below. For example, benzyl, benzhydryl, trityl, etc. are mentioned.

"Alkynyl" means a linear or branched monovalent hydrocarbon moiety containing from 2 to 20 carbon atoms, preferably from 2 to 10, more preferably from 2 to 6 carbon atoms containing at least one carbon-carbon triple bond. do. Alkynyl groups can be linked via a carbon atom containing a carbon-carbon triple bond or through a saturated carbon atom. Alkynyl groups may also be referred to collectively further substituted by certain substituents described below. For example, ethynyl, propynyl, etc. are mentioned.

"Alkylene" means a linear or branched saturated divalent hydrocarbon site of 1 to 20, preferably 1 to 10, more preferably 1 to 6 carbon atoms. The alkylene group may also refer to those further substituted by certain substituents described below. As an example of an alkylene group, methylene, ethylene, propylene, butylene, nuxylene, etc. are mentioned.

"Alkenylene" refers to a linear or branched divalent hydrocarbon moiety of 2 to 20, preferably 2 to 10, more preferably 2 to 6 carbon atoms comprising at least one carbon-carbon double bond. I mean. Alkenylene groups may be bonded through a carbon atom comprising a carbon-carbon double bond and / or through a saturated carbon atom. Alkenylene group can also refer to what is further substituted by the specific substituent mentioned later.

"Cycloalkylene" means a saturated or unsaturated non-aromatic divalent monocyclic, bicyclic or tricyclic hydrocarbon moiety of 3 to 12 ring carbons, which is further substituted by certain substituents described below. May be referred to. For example, cyclopropylene, cyclobutylene, etc. are mentioned.

"Arylene" means a divalent monocyclic, bicyclic or tricyclic aromatic hydrocarbon moiety having from 6 to 20, preferably from 6 to 12 ring atoms, further substituted by certain substituents described below. Comprehensively referred to can do. The aromatic moiety contains only carbon atoms. Phenylene etc. are mentioned as an example of an arylene group.

"Aralkylene" refers to a divalent moiety in which one or more hydrogen atoms of the alkyl group as defined above are substituted with an aryl group, and may be referred to as being further substituted by certain substituents described below. For example, benzylene etc. can be mentioned.

"Alkynylene" is a linear or branched divalent hydrocarbon moiety containing from 2 to 20 carbon atoms, preferably from 2 to 10, more preferably from 2 to 6 carbon atoms containing at least one carbon-carbon triple bond. Means. Alkynylene groups may be bonded through a carbon atom comprising a carbon-carbon triple bond or through a saturated carbon atom. Alkynylene groups may also be referred to collectively further substituted by a certain substituent described later. For example, ethynylene, propynylene, etc. are mentioned.

The fact that the substituents described above are " substituted or unsubstituted " means encompassing not only each of these substituents themselves, but also those further substituted by constant substituents. In the present specification, examples of the substituent which may be further substituted with each substituent include halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, aryl, haloaryl, aralkyl, haloaralkyl, Alkoxy, haloalcohol, carbonyloxy, halocarbonyloxy, aryloxy, haloaryloxy, silyl or siloxy, etc. are mentioned.

As described above, the method for preparing the photoalignable polymer described above is obvious to those skilled in the art from various documents in which various photoalignable polymers are disclosed.

For example, if the above-described photo-orientable polymer comprises repeating units of formula (1), such polymers may contain monomers of formula la in the presence of a catalyst composition comprising a procatalyst and a promoter comprising a transition metal of Group 10 It may be prepared by the addition polymerization to form a repeating unit of formula 1:

[Formula la]

In Formula _{_{3, p, R l5 R 2}} , R 3, and R4 are as defined in formula (I).

In addition, when the photo-orientation polymer comprises a repeating unit of Formula 2, such a polymer is in the presence of a catalyst composition comprising a procatalyst and a promoter comprising a transition metal of Group 4, Group 6, or Group 8 By ring-opening polymerization of the monomer of Formula la may be prepared by a method comprising the step of forming a repeating unit of Formula (2). As another selectable method, the photo-alignment polymer including the repeating unit represented by Chemical Formula 2 may be prepared in the presence of a catalyst composition including a procatalyst and a cocatalyst comprising a transition metal of Group 4, Group 6, or Group 8. It may also be prepared by ring-opening polymerization of norbornene (alkyl) ol, such as norbornene methane, as a monomer to form a ring-opening polymer having a pentagonal ring, and then introducing photoreactive functional groups into the ring-opening polymer. At this time, the introduction of the photoreactive functional group may proceed reaction condensation of the ring-opening polymer with a carboxylic acid compound or an acyl chloride compound having a photoreactive functional group corresponding to the formula la to le.

In the ring-opening polymerization step, when hydrogen is added to a double bond in the norbornene ring included in the monomer of Formula la, ring-opening may proceed, and together with the polymerization, the repeating unit of Formula 2 and a photoreactive including the same Polymers can be prepared.

However, since the specific manufacturing process and reaction conditions for the preparation of the above-described photo-alignment polymer are well known to those skilled in the art, further description thereof will be omitted.

Meanwhile, the optically anisotropic film of the above-described embodiment may further include a cured product of a binder compound together with the photo-alignment polymer, and the cured product of such a binder compound includes a bifunctional or higher polyvalent acrylate compound. It can be a crosslinked polymer obtained by photocuring a binder compound. At this time, as said binder compound, a penta retreat triacrylate

(pentaerythritol triacrylate; PET A), tri (2-acrylolyloxyethyl) isocynurate), trimethylolpropane triacrylate or nuclei to dipenta An acrylate (dipentaerythritol hexaacrylate; DPHA) and the like can be used, and two or more selected from these can be used together.

Moreover, when the hardened | cured material of such a binder compound is contained in an optically anisotropic film, the hardened | cured material of the photo-alignment polymer: binder compound mentioned above is about 2: 0-2 _: 3, or about 2: 1-2: 3. It may be included in the photoalignment film by weight ratio. By applying the aforementioned polyvalent acrylate-based binder compound in an appropriate weight ratio with the photo-alignment polymer, an appropriate P (polarity) value of the photo-alignment layer described above, for example, a P (polarity) value of about 0.02 to 0.28 More effectively. In one example, when a cellulose-based substrate such as TAC having a P (polarity) value of about 0.30 to 0.35 and black is about 0.31 to 0.32 is applied, a mixture of DPHA and PETA may be appropriately used as the binder compound. And more specifically, a mixture in which the DPHA and PETA are mixed in a weight ratio of about 2: 1 to about 1: 2, or in a weight ratio of about 1: 1, may be appropriately used. The cured product of the photoalignable polymer: binder compound may be included in the photoalignment film in a weight ratio of about 2: 0 to 2: 3, or about 2: 1 to 2: 3. Accordingly, it may be easier to adjust the P (polarity) value of the photoalignment film to an appropriate range of about 0.02 to 0.2.

In another example, when a cyclic olefin polymer or copolymer base or PET base such as COC or COP having a P (poIarity) value of about 0.01 to 0.03 and black is about 0.01 to 0.02, DPHA is less than the binder compound. Can be used appropriately. The cured product of the photo-alignment polymer: binder compound may be included in the photo-alignment film at a weight ratio of about 2: 0 to 2: 3, or about 2: 1 to 2: 2. Accordingly, the range of the appropriate P (polarity) value of the photoalignment film, which corresponds to the appropriate P (polarity) value of the substrate, for example, the range of about 0.06 to 0.28 can be more easily achieved.

As a result, the optimized surface energy of the liquid crystal layer underlying structure is achieved, The optically anisotropic film of the embodiment may exhibit excellent liquid crystal alignment and liquid crystal alignment stability.

On the other hand, the above-described liquid crystal layer on the photo-alignment film may include any liquid crystal compound known to be available for the optically anisotropic film without any particular limitation. However, the liquid crystal layer may include a liquid crystal compound represented by the following Chemical Formula 3 in view of better interaction with the above-described photoalignable polymer and the like:

[Formula 3]

In Chemical Formula 3, P is a polymerizable group including an acrylate, methacrylate group or epoxy group, R20 is hydrogen or an alkyl group having 1 to 6 carbon atoms, η is an integer of 1 to 10.

An example of a schematic structure of an optically anisotropic film including the above-described substrate, photoalignment film, and liquid crystal layer is shown in FIG. 1. In such an optically anisotropic film _: The photo-alignment film is coated on the substrate described above, a composition for photo-alignment film comprising a photo-alignment polymer, a binder compound, optionally a photoinitiator and an organic solvent, and optionally, to the applied composition The solvent contained may be dried and formed by irradiating ultraviolet (UV) to the applied composition.

In this case, the photoinitiator may be any initiator known to initiate and promote UV curing, and for example, an initiator known under the trade name Irgacure 907 or 819 may be used.

In addition, the organic solvent can be selectively used to dissolve the above-described components, specific examples thereof include toluene, anisole, chlorobenzene, dichloroethane, cyclo Nucleic acid

(cyclohexane), cyclopentane (cyclopentane) or propylene glycol methyl ether acetate (propylene glycol methyl ether acetate), and the like, two or more of the mixed solvents selected in these cases may be used. In addition to each kind According to the present invention, any solvent capable of dissolving them effectively and applying them onto the substrate can be used.

After applying the composition for the photo-alignment film comprising the above-described components on the substrate, and optionally removing the organic solvent, and then irradiated with ultraviolet rays, at least a part or all of the optical reaction groups bonded to the photo-alignment polymer is light Orientate, and UV polymerization and / or curing of the binder compound may occur. As a result, a photoalignment film including at least a portion of the photoreaction group photoaligned photoalignment polymer and optionally a cured product of a binder compound can be formed on the substrate. In this case, by applying the predetermined substrate, the photo-alignment polymer, the binder compound, and an appropriate weight ratio thereof, the substrate and the photo-alignment layer may each exhibit a P (polarity) value according to one embodiment as described above.

In the method of forming the photoalignment film, in the composition applying step, the concentration of the solution, the type of the solvent, and the coating method may be determined according to specific types of the photoalignable polymer, the binder compound, and the photoinitiator. The coating method may be, for example, a coating method, a spin coating method, a printing method, an inkjet spraying method, or a slit nozzle method, and through this method, the composition for the photo-alignment film may be appropriately applied to the surface of the substrate.

In addition, in the drying step of the solvent, the solvent may be removed by heating the coating film or drying by vacuum evaporation. This drying step may proceed for about 20 to 90 minutes at about 50 to 250 ^° C.

In the ultraviolet irradiation step, polarized ultraviolet rays having a wavelength range of about 150 to 450 nm may be irradiated to the dried coating surface. At this time, the irradiation intensity of the ultraviolet light may vary depending on the type of photo-alignment polymer or photoreactive group bonded thereto, but energy of about 50 mJ / ciif to 10 J / αη ² , preferably about 500 mJ / ci ² to 5J / We can examine the energy of an ² .

The photoalignment film formed by the above method may have a thickness of about 10 to 1000 nm, or about 30 to 1000 nm.

On the other hand, after the formation of the photo-alignment layer, a liquid crystal layer may be formed on the photo-alignment layer by a conventional method, and the liquid crystal included in the liquid crystal layer using the photo-alignment layer. The molecules can be oriented. As such, the optically anisotropic film of one embodiment may be manufactured, and the optically anisotropic film may exhibit excellent liquid crystal alignment phase and liquid crystal alignment stability by optimizing the surface energy of the liquid crystal layer lower structure.

The above-mentioned optically anisotropic film can exhibit functions, such as a liquid crystal aligning film, an optical filter, a retardation film, a patterned retardation film, a polarizer, or a polarizing light-emitting body applicable to optical irradiation etc., such as a liquid crystal display element.

【Effects of the Invention】

According to the present invention, an optically anisotropic film can be used to align the liquid crystal of the liquid crystal layer more effectively by using the optical alignment film, and can exhibit excellent liquid crystal alignment stability and excellent interaction and interaction between the liquid crystal layer and the optical alignment layer. This may be provided. Such an optically anisotropic film may be preferably applied to a liquid crystal alignment film, an optical filter, a retardation film, a patterned phase retardation film, a polarizer or a polarizing light emitter or the like due to excellent alignment characteristics. [Brief Description of Drawings]

1 is a view showing a schematic structure of an optically anisotropic film of one embodiment including a substrate, an optical alignment film and a liquid crystal layer.

[Specific contents to carry out invention]

Hereinafter, preferred embodiments of the present invention are provided to aid in understanding the present invention. However, the following examples are merely provided to more easily understand the present invention, and the contents of the present invention are not limited thereto. Examples 1-3 and Comparative Example 1: Preparation of Optically Anisotropic Film

2.5 weight% of the photo-alignment polymer of the poly [4- (1-phenyl perfluoroheptyloxy) -cinnamate-5-norbornene] was used, and the polyhydric acrylate type compound (pentaerythr triacrylate; PETA) The binder compound of was used so that the weight ratio of said photo-alignment polymer: binder compound might be a weight ratio of 2 _: 0, 2: 1, 2: 2, and 2: 4, respectively. With these light-polymer orientation increases and a binder compound, the photoinitiator dissolved coming 1 weight ^_0/0 (Ciba Inc. irgacure 907) in toluene solvent, was coated on the TAC film bar away the solution to about lOOnm thick. Then, dry at 80 ^° C for 2 minutes Thereafter, the polarized UV of the UV-B region was irradiated with IJ / cm ² to form optical anisotropic films of Examples 1 to 3 and Comparative Example 1. Examples 4-6 and Comparative Example 2: Preparation of Optically Anisotropic Film

The optically anisotropic films of Examples 4 to 6 and Comparative Example 2 were formed in the same manner as in Examples 1 to 3 and Comparative Example 1, except that a COP film was used as the substrate instead of the TAC film. Examples 7 to 9 and Comparative Example 3: Preparation of Optically Anisotropic Film

The optically anisotropic films of Examples 7 to 9 and Comparative Example 3 were formed in the same manner as in Examples 1 to 3 and Comparative Example 1, except that a COC film was used as the substrate instead of the TAC film. Examples 10 to 12 and Comparative Example 4: Preparation of Optically Anisotropic Film

The optically anisotropic films of Examples 10 to 12 and Comparative Example 4 were formed in the same manner as in Examples 1 to 3 and Comparative Example 1, except that a PET film was used as the substrate instead of the TAC film. Examples 13-15 and Comparative Example 5: Preparation of Optically Anisotropic Film

Of poly [4- (4-methylketone benzyloxy) -cinnamate-5-norbornene] instead of the photo-oriented polymer of poly [4- (1-phenyl perfluoroheptyloxy) -cinnamate-5-norbornene] Except for using the photo-alignment polymer, the optically anisotropic films of Examples 13 to 15 and Comparative Example 5 were formed in the same manner as in Examples 1 to 3 and Comparative Example 1. Examples 16-18 and Comparative Example 6: Preparation of Optically Anisotropic Film

The optically anisotropic films of Examples 16 to 18 and Comparative Example 6 were formed in the same manner as in Examples 13 to 15 and Comparative Example 5, except that a COP film was used as the substrate instead of the TAC film. Examples 19-21 and Comparative Example 7: Preparation of Optically Anisotropic Film

The optically anisotropic films of Examples 19 to 21 and Comparative Example ₇ were formed in the same manner as Examples 13 to 15 and Comparative Example 5, except that a COC film was used as the substrate instead of the TAC film. Examples 22-24 and Comparative Example 8: Preparation of Optically Anisotropic Film

The optically anisotropic films of Examples 22 to 24 and Comparative Example 8 were formed in the same manner as in Examples 13 to 15 and Comparative Example 5, except that a PET film was used as the substrate instead of the TAC film. Examples 25-27 and Comparative Example 9: Preparation of Optically Anisotropic Film

Poly [(3,4-difluoro) -cinnamate-2-methyl 5-norbornene instead of photo-oriented polymer of poly [4- (1-phenyl perfluoroheptyloxy) -cinnamate-5-norbornene] ], And the optically anisotropic films of Examples 25 to 27 and Comparative Example 9 were formed in the same manner as in Examples 1 to 3 and Comparative Example 1. Examples 28-30 and Comparative Example 10 Preparation of Optically Anisotropic Film

The optically anisotropic films of Examples 28 to 30 and Comparative Example 10 were formed in the same manner as Examples 25 to 27 and Comparative Example 9, except that a COP film was used as the substrate instead of the TAC film. Examples 31 to 33 and Comparative Example 11: Preparation of Optically Anisotropic Film

The optically anisotropic films of Examples 31 to 33 and Comparative Example 11 were formed in the same manner as Examples 25 to 27 and Comparative Example 9, except that a COC film was used as the substrate instead of the TAC film. Examples 34-36 and Comparative Example 12 Preparation of Optically Anisotropic Film

Examples 34-36 and comparison in the same manner as in Examples 25-27 and Comparative Example 9, except that PET film was used as the substrate instead of the TAC film The optically anisotropic film of Example 12 was formed. Example 37 Preparation of Optically Anisotropic Film

The photo-alignment polymer was prepared by using 2.0 wt% of the photo-alignment polymer of poly [4-fluoro-cinnamate-5-norbornene] and a binder compound of a polyhydric acrylate compound (pentaerytri triacrylate; PETA). : The weight ratio of the binder compound was used, respectively so that it might become a weight ratio of 2: 2. Together with these photo-orientable polymers and binder compounds, 0.1 weight% of the photoinitiator (Ciba irgacure 907) was dissolved in a cyclcookpentanon (CPO) solvent and the solution was dropped onto a COP film at a thickness of about 100 nm and barcoated. Then, after drying at 80 ^° C. for 2 minutes, the polarized UV of the UV-B region was irradiated with lJ / cm ² , to form an optically anisotropic film of Example 35. Example 38 Preparation of Optically Anisotropic Film

Poly [4- meteuk upon-cinnamate-5-norbornene] of the optical alignment polymer weight 2.0 ^_0/0 using, and polyvalent acrylate-based compound (the DPHA PETA and 1: common common compound combined in a weight ratio of: 1) The binder compound of was used so that the weight ratio of the said photo-alignment polymer: binder compound might be a weight ratio of 2 _: 1, respectively. With these optical alignment polymerizable material and a binder compound, dissolved in a 0.1 wt ^_0/0 of the photoinitiator (Ciba Inc. irgacure 907) in toluene solvent, and bar coating consider breaking the solution dropped on the TAC film to a thickness of about lOOnm. Then, after drying for 2 minutes at 80 ^° C., the polarized UV of the UV-B region was irradiated with lJ / cm ² to form an optically anisotropic film of Example 36. Test Example 1 Measurement and Calculation of P (polarity) Values

With respect to the optically anisotropic films of Examples 1 to 38 and Comparative Examples 1 to 12, P (polarity) values of the substrate and the optical alignment film were calculated by the following method. First, ^at a room temperature of about 25 ^° C, about 10 drops of water and about diiodomethane drops are placed on the surface of the substrate and the photoalignment film (ie, each liquid drop is lightly formed to form the surface of the substrate or the photoalignment film). And after positioning), the angle of the contact portion formed between the surface of the substrate or the photo-alignment film and each liquid drop is determined by Measured by the method, the water room and the measured value of the contact angle with respect to the diiodomethane droplet were derived. In this case, the contact angle was measured using a Drop Shape Analysis measuring apparatus (trade name DSA 100).

Substitute the contact angles of the water droplets and diiodomethane droplets derived above into the Owens-Wendt-Rabel-Kaelble equation to calculate the characteristic values of IFT (s, P) and IFT (s) on the substrate or photo-alignment film surface. It was. According to Equation 1, P (polarity) = IFT (s, P) / IFT (s) with a value of the polarity P (polarity) values for the substrate and the optical alignment film was calculated. The P (polarity) values thus calculated are shown in Tables 1 to 3 below. Test Example 2: Evaluation of Orientation

The liquid crystal for A-plate was coated on the optical alignment layer of the optically anisotropic film of Examples 1 to 38 and Comparative Examples 1 to 12, and dried at 60 ^° C. for 2 minutes, and then cured the liquid crystal by irradiating with 50mJ ultraviolet rays. Then, a film was placed between the polarizing plates to check the degree of orientation. The degree of orientation was also represented by an integer of 1 to 5, the closer to 5 by the following criteria was evaluated as excellent in orientation. These orientation evaluation results are shown in Tables 1 to 3 below.

5. Very good degree of orientation;

4. excellent degree of orientation;

3. Orientation is observed but insufficient for practical use;

2. hardly observed orientation;

1. No orientation was observed at all. TABLE 1

2]

TABLE 3

According to the above Tables 1 to 3, it was confirmed that the optically anisotropic film of Examples 1 to 38 including a substrate having an appropriate P (polarity) and a photo-alignment film exhibited excellent orientation. In particular, the optical anisotropy of Examples 37 and 38 The film was found to exhibit the best orientation. On the other hand, it was confirmed that the optically anisotropic films of Comparative Examples 1 to 12 including the photoalignment film deviating from the P (polarity) suitable for the P (polarity) of the substrate exhibited poor alignment properties.

Claims

Claims Claim 1 A substrate having a polarity (P) of 0.01 to 0.35, which is defined by Equation 1 below; A photoalignment film on the substrate including at least some photoreaction groups including a photoalignment polymer having photoalignment, and having a polarity (P) of 0.02 to 0.28 defined by Equation 1 below; An optically anisotropic film comprising a liquid crystal layer on the optical alignment film:

[Equation 1]

P (polarity) = IFT (s, P) / IFT (s)

In Equation 1, IFT (s, P) and IFT (s) are measured by placing 10 ^ water drops and 4 diiodomethane drops on the substrate or photo-alignment surface. It is calculated by substituting the contact angle of the iodomethane chamber into the Owens-Wendt-Rabel-Kaelble equation.

[Claim 2]

The optically anisotropic film according to claim 1, wherein the polarity (P) of the substrate is 01 to 0.03, and the polarity (P) of the photoalignment film is 0.06 to 0.28.

[Claim 3]

The optically anisotropic film according to claim 1, wherein the polarity (P) of the substrate is 0.30 to 0.35, and the polarity (P) of the photoalignment film is 0.02 to 0.2.

[Claim 4]

The method of claim 1, wherein the substrate is a triacetyl cellulose (TAC) based, cyclic olefin polymer (cyclic olefin polymer; COC) based PET substrate or cyclic olefin copolymer (cyclic olefin copolymer; COP) Optically anisotropic film ᅳ

[Claim 5]

The method of claim 1, wherein the photo-alignment polymer is

Optical anisotropic film containing repeat unit:

[Formula 1] [Formula 2]

In Chemical Formulas 1 and 2,

n is 50 to 5,000,

p is an integer from 0 to 4,

At least one of R _h R ₂ , R ₃ , and R 4 is a radical selected from the group consisting of the formulas la to le, and the others may be the same as or different from each other, and each independently hydrogen; halogen; Substituted or unsubstituted alkyl having 1 to 20 carbon atoms; Substituted or unsubstituted alkenyl having 2 to 20 carbon atoms; Substituted or unsubstituted cycloalkyl having 5 to 12 carbon atoms; Substituted or unsubstituted aryl having 6 to 40 carbon atoms; Substituted or unsubstituted aralkyl having 7 to 15 carbon atoms; Substituted or unsubstituted alkynyl having 2 to 20 carbon atoms; Or a polar functional group selected from the group consisting of non-hydrocarbonaceous polar groups containing at least one element selected from the group consisting of oxygen, nitrogen, phosphorus, sulfur, silicon and boron,



In the above formula la to le,

nl is an integer from 0 to 4, n2 is an integer from 0 to 5, 1 is 0 or

1

D and D, each independently a simple bond; Oxygen; Substituted or unsubstituted alkylene having 1 to 20 carbon atoms; Substituted or unsubstituted cycloalkylene having 3 to 12 carbon atoms; And substituted or unsubstituted C1-20 Selected from the group consisting of alkylene oxides,

E is a simple bond; Substituted or unsubstituted alkylene having 1 to 20 carbon atoms; Or substituted or unsubstituted arylene oxide having 6 to 40 carbon atoms,

X is oxygen or sulfur,

R ₁₀ , R _u , R ₁₂ , R ₁₃ and R ₁₄ are the same as or different from each other, and each independently hydrogen; halogen; Substituted or unsubstituted alkyl having 1 to 20 carbon atoms; Substituted or unsubstituted cycloalkyl having 4 to 8 carbon atoms; Substituted or unsubstituted alkoxy having 1 to 20 carbon atoms; Substituted or unsubstituted aryloxy having 6 to 30 carbon atoms; Substituted or unsubstituted aryl having 6 to 40 carbon atoms; Substituted or unsubstituted aralkyl having 6 to 40 carbon atoms; Heteroaryl having 6 to 40 carbon atoms including group 14, 15 or 16 hetero elements; Substituted or unsubstituted alkoxy aryl having 6 to 40 carbon atoms; Cyano; Nitrile; Nitro; And hydroxy, and

R ₁₅ is one or two substituents, each independently hydrogen; halogen; Cyano; Substituted or unsubstituted alkyl having 1 to 20 carbon atoms; Substituted or unsubstituted alkoxy having 1 to 20 carbon atoms; Substituted or unsubstituted aryloxy of 6 to 30 carbon atoms; Substituted or unsubstituted aryl having 6 to 40 carbon atoms; Heteroaryl having 6 to 40 carbon atoms including a hetero element of Group 14, 15 or 16; And substituted or unsubstituted alkoxyaryl having 6 to 40 carbon atoms.

[Claim 6]

The optically anisotropic method according to claim 1, further comprising a cured product of the binder compound. Sex film.

[Claim 7]

The optically anisotropic film according to claim 6, wherein the cured product of the binder compound comprises a crosslinked polymer of a bifunctional or higher polyvalent acrylate compound.

[Claim 8]

7. The optically anisotropic film according to claim 6, wherein the cured product of the photoalignable polymer: binder compound is contained in a weight ratio of 2: 0 to 2: 3.

[Claim 9]

The optically anisotropic film of claim 1, wherein the liquid crystal layer comprises a liquid crystal compound represented by Formula 3 below:

[Formula 3]

In Formula 3, Ρ is an acrylate, methacrylate

It is a polymerizable group containing an epoxy group,

R20 is hydrogen or an alkyl group having 1 to 6 carbon atoms,

eta is an integer from 1 to 10.

[Claim 10]

The optically anisotropic film of claim 2, wherein the photo-alignment polymer has one or more functional groups including alkoxy or alkoxyaryl at the photoreaction ends.

[Claim 11]

The method of claim 5, wherein the polarity (P) of the substrate is 0.30 to 0.35, The photo-oriented polymer has an optical reaction group of the formula la, and the optically anisotropic film of Formula 1 wherein R 14 is alkoxy having 1 to 5 carbon atoms.

[Claim 12]

The optically anisotropic film of claim 3, wherein the photoalignable polymer has one or more functional groups including a halogen or an aralkyl group bonded to the photoreactor terminal.

[Claim 13]

The method of claim 5, wherein the polarity (P) of the substrate is 0.01 to 0.03, the photo-alignment polymer has a photoreactor of the formula la, R14 is halogen, D, D, is a simple bond, 1 is 0 An optically anisotropic film which is a homopolymer of the formula (1).

[Claim 14]

The optically anisotropic film according to claim 6, wherein the substrate has a polarity (P) of 0.01 to 0.03, and the cured product of the photo-oriented polymer: binder compound is included in a weight ratio of 2: 1 to 2 _: 3.

[Claim 15]

15. The optically anisotropic film according to claim 14, wherein the binder compound is dipentaerythritolhexaacrylate (DPHA).

[Claim 16]

The optically anisotropic film according to claim 6, wherein the polarity (P) of the substrate is 0.30 to 0.35, and the cured product of the optical orientation polymer: binder compound is contained in a weight ratio of 1: 0 to 1 _: 2.

[Claim 17]

The method of claim 16, wherein the binder compound nucleated dipentaerythr An optically anisotropic film in which a mixture of dipentaerythritol hexaacrylate (DPHA) and pentaerythritol is pentaerythritol triacrylate (PETA).

[Claim 18]

The optically anisotropic film according to claim 1, wherein the photo-alignment film has a thickness of 10 to 1000 ran.

[Claim 19]

The optically anisotropic film according to claim 1, which has a function of a liquid crystal aligning film, an optical filter, a retardation film, a patterned retardation film, a polarizer, or a polarizer.

[Claim 20]

An optical element comprising the optically anisotropic film of claim 1.