JP2021152147A - Polymerizable liquid crystal compound, polymerizable liquid crystal composition, retardation film, elliptical polarizing plate and organic el display device - Google Patents

Abstract

To provide a polymerizable liquid crystal compound which solely exhibits high solubility in a solvent and can improve the solubility in a solvent of other polymerizable liquid crystal compounds capable of constituting an optical film.SOLUTION: There is provided a polymerizable liquid crystal compound represented by the formula (1). [M represents a divalent alicyclic hydrocarbon group, B1 and B2 represent -Ra3COORa4-, -Ra5OCORa6 or the like, A1 and A2 represent a divalent alicyclic hydrocarbon group or an aromatic group, L1 and L2 represent -O-, -COO- or -OCO-, Ea and Eb represent an alkanediyl group having 1 to 12 carbon atoms, P is an acryloyloxy group or a methacryloyloxy group, when a smaller one of the total number of carbon atoms in a group represented by Ea and the total number of carbon atoms in a group represented by Eb is defined as N1 and a larger one is defined as N2, N1 is 2 to 6, N2 is 6 to 12 and the relation of 1<N2-N1<10 is satisfied.]SELECTED DRAWING: None

Description

The present invention comprises a polymerizable liquid crystal compound, a polymerizable liquid crystal composition containing the polymerizable liquid crystal compound, a retardation film composed of a cured product of the polymerizable liquid crystal composition, and an elliptical polarizing plate including the retardation film. The present invention relates to an organic EL display device.

As an optical film such as a retardation film used in a flat panel display device (FPD), for example, a coating liquid obtained by dissolving a polymerizable liquid crystal compound in a solvent is applied to a supporting base material and then polymerized. There is an optical film. As a polymerizable liquid crystal compound for forming such an optical film, for example, a nematic liquid crystal compound having a rod-like structure in which a plurality of 6-membered rings are connected is known (for example, Patent Document 1).

On the other hand, the retardation film is required to be capable of uniform polarization conversion in the entire wavelength region as one of its characteristics. For example, the retardation value Re (λ) at a certain wavelength λ is set to 550 nm. Indicates a wavelength range in which the value [Re (λ) / Re (550)] divided by the phase difference value Re (550) is close to 1, or the inverse wavelength dispersibility of [Re (450) / Re (550)] <1. It is known that uniform polarization conversion is theoretically possible in the wavelength range. A polymerizable liquid crystal compound that can form such a retardation film is disclosed in, for example, Patent Document 2.

Japanese Unexamined Patent Publication No. 2010-24438 Japanese Unexamined Patent Publication No. 2011-207765

In the coating liquid used for producing an optical film, the solubility in a solvent may be poor depending on the molecular structure of the polymerizable liquid crystal compound. Such a polymerizable liquid crystal compound having low solubility may precipitate in the coating solution or may crystallize and precipitate, and the precipitation or precipitation of such a polymerizable liquid crystal compound is film-forming. Not only is it lowered, but it can also cause orientation defects in the resulting optical film.

Therefore, an object of the present invention is to provide a polymerizable liquid crystal compound capable of exhibiting high solubility in a solvent by itself.

［式（Ｉ）中、
Ｍは、２価の脂環式炭化水素基を表し、該２価の脂環式炭化水素基に含まれる水素原子は、ハロゲン原子、炭素数１〜４のアルキル基、炭素数１〜４のフルオロアルキル基、炭素数１〜４のアルコキシ基、シアノ基またはニトロ基に置換されていてもよく、該２価の脂環式炭化水素基を構成する炭素原子は、酸素原子、硫黄原子または窒素原子に置換されていてもよく、
Ｂ^１およびＢ^２は、それぞれ独立に、炭素数１〜４のアルキレン基、−Ｏ−、−Ｓ−、−Ｒ^ａ１ＯＲ^ａ２−、−Ｒ^ａ３ＣＯＯＲ^ａ４−、−Ｒ^ａ５ＯＣＯＲ^ａ６−、−Ｒ^ａ７ＯＣ＝ＯＯＲ^ａ８−、−ＯＲ^ｂＯ−、−Ｃ（＝Ｏ）−ＮＲ^ｃ−、−Ｎ＝Ｎ−、−ＣＲ^ｃ＝ＣＲ^ｄ−または−Ｃ≡Ｃ−を表し、ここで、Ｒ^ａ１〜Ｒ^ａ８はそれぞれ独立に単結合または炭素数１〜４のアルキレン基であり、Ｒ^ｂは炭素数１〜４のアルキレン基であり、Ｒ^ｃおよびＲ^ｄは炭素数１〜４のアルキル基または水素原子を表し、
Ａ^１およびＡ^２は、それぞれ独立に、２価の脂環式炭化水素基または芳香族基を表し、該２価の脂環式炭化水素基または芳香族基に含まれる水素原子は、ハロゲン原子、炭素数１〜４のアルキル基、炭素数１〜４のフルオロアルキル基、炭素数１〜４のアルコキシ基、シアノ基またはニトロ基に置換されていてもよく、該２価の脂環式炭化水素基または芳香族基を構成する炭素原子は、酸素原子、硫黄原子または窒素原子に置換されていてもよく、
Ｌ^１およびＬ^２は、それぞれ独立に、−Ｏ−、−ＣＯＯ−または−ＯＣＯ−を表し、
Ｅ^ａおよびＥ^ｂは、それぞれ独立に、炭素数１〜１２のアルカンジイル基を表し、ここで、該アルカンジイル基に含まれる水素原子は、炭素数１〜４のアルキル基またはハロゲン原子で置換されていてもよく、該アルカンジイル基に含まれ、Ｌ^１またはＬ^２と隣接していない−ＣＨ_２−は、−Ｏ−または−Ｓ−で置換されていてもよく（但し、Ｅ^ａおよびＥ^ｂ中に−Ｏ−および／または−Ｓ−が複数存在する場合、これらは互いに隣接しない）
Ｐはアクリロイルオキシ基またはメタクリロイルオキシ基であり、
Ｅ^ａにより表される基における炭素原子数の合計とＥ^ｂにより表される基における炭素原子数の合計のうち少ない方をＮ１、多い方をＮ２とした場合、Ｎ１は２〜６であり、Ｎ２は６〜１２であり、１＜Ｎ２−Ｎ１＜１０の関係を満たす］
で表される重合性液晶化合物。
［２］Ｍが、炭素数５〜８の２価の脂環式炭化水素基である、前記［１］に記載の重合性液晶化合物。
［３］Ａ^１およびＡ^２が、それぞれ独立に、２価の芳香族基を表し、該２価の芳香族基に含まれる水素原子は、ハロゲン原子、炭素数１〜４のアルキル基、炭素数１〜４のフルオロアルキル基、炭素数１〜４のアルコキシ基、シアノ基またはニトロ基に置換されていてもよく、該２価の芳香族基を構成する炭素原子は、酸素原子、硫黄原子または窒素原子に置換されていてもよい、前記［１］または［２］に記載の重合性液晶化合物。
［４］Ｂ^１およびＢ^２が、それぞれ独立に、−ＣＯＯ−または−ＯＣＯ−である、前記［１］〜［３］のいずれかに記載の重合性液晶化合物。
［５］前記［１］〜［４］のいずれかに記載の重合性液晶化合物と、式（ＩＩ）：

［式（ＩＩ）中、Ａｒは少なくとも１つの芳香環を有する２価の基であり、該２価の基を構成する芳香環は窒素原子、酸素原子および硫黄原子のうちの少なくとも１つを含んでいてもよく、Ａｒを構成する芳香環に含まれるπ電子数の合計数Ｎ_πは１２以上３６未満であり、
Ｇ^１およびG^２は、それぞれ独立に、２価の脂環式炭化水素基を表し、該脂環式炭化水素基に含まれる水素原子は、ハロゲン原子、炭素数１〜４のアルキル基、炭素数１〜４のフルオロアルキル基、炭素数１〜４のアルコキシ基、シアノ基またはニトロ基に置換されていてもよく、該脂環式炭化水素基に含まれる−ＣＨ_２−は、−Ｏ−、−Ｓ−または−ＮＨ−に置換されていてもよく、
Ｂ^３およびＢ^４は、それぞれ独立に、単結合または２価の連結基を表し、
Ａ^３およびＡ^４は、それぞれ独立に、炭素数３〜２０の２価の脂環式炭化水素基または炭素数６〜２０の２価の芳香族炭化水素基を表し、該脂環式炭化水素基および該芳香族炭化水素基に含まれる水素原子は、ハロゲン原子、フッ素原子で置換されていてもよい炭素数１〜４のアルキル基、フッ素原子で置換されていてもよい炭素数１〜４のアルコキシ基、シアノ基またはニトロ基で置換されていてもよく、該脂環式炭化水素基に含まれる−ＣＨ_２−は、−Ｏ−、−Ｓ−または−ＮＲ^１−で置き換わっていてもよく、該脂環式炭化水素基に含まれる−ＣＨ（−）−は−Ｎ（−）−で置き換わっていてもよく、Ｒ^１は、水素原子または炭素数１〜４のアルキル基を表し、
Ｌ^３〜Ｌ^６は、それぞれ独立に、−Ｏ−、−ＣＯＯ−または−ＯＣＯ−を表し、
Ｅ^ｃおよびＥ^ｄは、それぞれ独立に、炭素数１〜１７のアルカンジイル基を表し、該アルカンジイル基に含まれる水素原子は、ハロゲン原子で置換されていてもよく、該アルカンジイル基に含まれる−ＣＨ_２−は、−Ｏ−または−ＣＯ−で置き換わっていてもよく、
Ｐ^１およびＰ^２は、それぞれ独立に、重合性基を表す］
で表される重合性液晶化合物とを含む、重合性液晶組成物。
［６］式（ＩＩ）で表される重合性液晶化合物が、波長３００ｎｍ以上４００ｎｍ以下の範囲に極大吸収を示す、前記［５］に記載の重合性液晶組成物。
［７］式（ＩＩ）で表される重合性液晶化合物を、式（Ｉ）で表される重合性液晶化合物１００質量部に対して０．１質量部以上５０質量部以下の量で含む、前記［５］または［６］に記載の重合性液晶組成物。
［８］前記［５］〜［７］のいずれかに記載の重合性液晶組成物の硬化物であって、該重合性液晶組成物中の重合性液晶化合物が配向した状態で硬化してなる液晶硬化膜を含む位相差フィルム。
［９］液晶硬化膜が、式（１）、（２）および（３）：
Ｒｅ（４５０）／Ｒｅ（５５０）≦１．００ （１）
１．００≦Ｒｅ（６５０）／Ｒｅ（５５０） （２）
１００ｎｍ≦Ｒｅ（５５０）≦１８０ｎｍ （３）
［式中、Ｒｅ（λ）は液晶硬化膜の波長λｎｍにおける面内位相差値を示し、Ｒｅ＝（ｎｘ（λ）−ｎｙ（λ））×ｄである（ｄは液晶硬化膜の厚みを表し、ｎｘは、液晶硬化膜が形成する屈折率楕円体において、液晶硬化膜の平面に平行な方向の波長λｎｍにおける主屈折率を表し、ｎｙは、液晶硬化膜が形成する屈折率楕円体において、液晶硬化膜の平面に対して平行であり、且つ、前記ｎｘの方向に対して直交する方向の波長λｎｍにおける屈折率を表す）］
で表される光学特性を有する、前記［８］に記載の位相差フィルム。
［１０］液晶硬化膜が、式（４）、（５）および（６）：
Ｒｔｈ（４５０）／Ｒｔｈ（５５０）≦１．００ （４）
１．００≦Ｒｔｈ（６５０）／Ｒｔｈ（５５０） （５）
−１００ｎｍ≦Ｒｔｈ（５５０）≦−４０ｎｍ （６）
［式中、Ｒｔｈ（λ）は液晶硬化膜の波長λｎｍにおける厚み方向の位相差値を示し、Ｒｔｈ＝（（ｎｘ（λ）＋ｎｙ（λ））／２−ｎｚ）×ｄである（ｄは液晶硬化膜の厚みを表し、ｎｘは、液晶硬化膜が形成する屈折率楕円体において、液晶硬化膜の平面に平行な方向の波長λｎｍにおける屈折率を表し、ｎｙは、液晶硬化膜が形成する屈折率楕円体において、液晶硬化膜の平面に対して平行であり、且つ、前記ｎｘの方向に対して直交する方向の波長λｎｍにおける屈折率を表し、ｎｚは、液晶硬化膜が形成する屈折率楕円体において、液晶硬化膜の平面に対して垂直な方向の波長λｎｍにおける屈折率を表す）］
で表される光学特性を有する、前記［８］に記載の位相差フィルム。
［１１］前記［８］〜［１０］のいずれかに記載の位相差フィルムと偏光フィルムとを含む楕円偏光板。
［１２］前記［１１］に記載の楕円偏光板を備える有機ＥＬ表示装置。
［１３］前記［１１］に記載の楕円偏光板を有するフレキシブル画像表示装置。
［１４］ウインドウとタッチパネルタッチセンサとを更に有する、前記［１３］に記載のフレキシブル画像表示装置。 The present invention provides the following preferred embodiments.
[1] Equation (I):

[In formula (I),
M represents a divalent alicyclic hydrocarbon group, and the hydrogen atom contained in the divalent alicyclic hydrocarbon group is a halogen atom, an alkyl group having 1 to 4 carbon atoms, and 1 to 4 carbon atoms. It may be substituted with a fluoroalkyl group, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group, and the carbon atom constituting the divalent alicyclic hydrocarbon group is an oxygen atom, a sulfur atom or a nitrogen atom. May be replaced by an atom
B ¹ and B ² are independently alkylene groups having 1 to 4 carbon atoms, -O-, -S-, -R ^a1 OR ^a2- , -R ^a3 COOR ^a4- , -R ^a5 OCOR ^a6 -,-, respectively. R ^a7 OC = OOR ^a8 −, −OR ^b O−, −C (= O) −NR ^c −, −N = N−, −CR ^c = CR ^d − or −C≡C−, where R ^{a1 to} R ^a8 are independently single-bonded or alkylene groups ^{having 1 to 4 carbon atoms, R b} is an alkylene group having 1 to 4 carbon atoms, and R ^c and R ^d are alkyls having 1 to 4 carbon atoms. Represents a group or hydrogen atom
A ¹ and A ² independently represent a divalent alicyclic hydrocarbon group or an aromatic group, and the hydrogen atom contained in the divalent alicyclic hydrocarbon group or an aromatic group is a halogen atom. , The divalent alicyclic hydrocarbon may be substituted with an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group. The carbon atoms that make up the hydrogen or aromatic groups may be substituted with oxygen, sulfur or nitrogen atoms.
L ¹ and L ² independently represent -O-, -COO- or -OCO-, respectively.
E ^a and E ^b each independently represent an alkanediyl group having 1 to 12 carbon atoms, wherein the hydrogen atom contained in the alkanediyl group is replaced with an alkyl group or a halogen atom having 1 to 4 carbon atoms. _{-CH 2-,} which is contained in the alkanediyl group and is not adjacent to ^{L 1} or L ² , may be substituted with -O- or -S- (where E ^a and E a and If there are multiple -O- and / or -S- in ^{Eb, they are not adjacent to each other)}
P is an acryloyloxy group or a methacryloyloxy group,
If the lesser of the total number of carbon atoms in the groups represented by the sum and E ^b of the number of carbon atoms in the groups represented by E ^a N1, the larger amount was N2, N1 is 2-6, N2 is 6 to 12 and satisfies the relationship of 1 <N2-N1 <10]
A polymerizable liquid crystal compound represented by.
[2] The polymerizable liquid crystal compound according to the above [1], wherein M is a divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms.
[3] A ¹ and A ² each independently represent a divalent aromatic group, and the hydrogen atom contained in the divalent aromatic group is a halogen atom, an alkyl group having 1 to 4 carbon atoms, and carbon. It may be substituted with a fluoroalkyl group having a number of 1 to 4, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group, and the carbon atom constituting the divalent aromatic group is an oxygen atom or a sulfur atom. The polymerizable liquid crystal compound according to the above [1] or [2], which may be substituted with a nitrogen atom.
[4] The polymerizable liquid crystal compound according to any one of [1] to [3] above, wherein ^{B 1} and B ^{2 are independently -COO- or -OCO-, respectively.}
[5] The polymerizable liquid crystal compound according to any one of the above [1] to [4] and the formula (II):

[In formula (II), Ar is a divalent group having at least one aromatic ring, and the aromatic ring constituting the divalent group contains at least one of a nitrogen atom, an oxygen atom and a sulfur atom. The total number of π electrons contained in the aromatic ring constituting Ar, N _π, is 12 or more and less than 36.
G ¹ and G ² each independently represent a divalent alicyclic hydrocarbon group, and the hydrogen atom contained in the alicyclic hydrocarbon group is a halogen atom, an alkyl group having 1 to 4 carbon atoms, and carbon. It may be substituted with a fluoroalkyl group having a number of 1 to 4, an alkoxy group having a carbon number of 1 to 4, a cyano group or a nitro group, and −CH ₂ − contained in the alicyclic hydrocarbon group is −O−. , -S- or -NH-,
B ³ and B ⁴ each independently represent a single bond or a divalent linking group.
A ³ and A ⁴ independently represent a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms or a divalent aromatic hydrocarbon group having 6 to 20 carbon atoms. The hydrogen atom contained in the group and the aromatic hydrocarbon group may be substituted with a halogen atom, an alkyl group having 1 to 4 carbon atoms which may be substituted with a fluorine atom, and 1 to 4 carbon atoms which may be substituted with a fluorine atom. It may be substituted with an alkoxy group, a cyano group or a nitro group of the above, and -CH _2- contained in the alicyclic hydrocarbon group may be replaced with -O-, -S- or -NR ^1-. Often, -CH (-)-contained in the alicyclic hydrocarbon group may be replaced by -N (-)-, where R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
L ^{3 to} L ⁶ independently represent -O-, -COO- or -OCO-, respectively.
E ^c and E ^d each independently represent an alkanediyl group of 1 to 17 carbon atoms, hydrogen atoms contained in the alkanediyl group may be substituted with halogen atoms, contained in the alkanediyl group -CH ₂ -may be replaced by -O- or -CO-.
P ¹ and P ² each independently represent a polymerizable group]
A polymerizable liquid crystal composition containing a polymerizable liquid crystal compound represented by.
[6] The polymerizable liquid crystal composition according to the above [5], wherein the polymerizable liquid crystal compound represented by the formula (II) exhibits maximum absorption in a wavelength range of 300 nm or more and 400 nm or less.
[7] The polymerizable liquid crystal compound represented by the formula (II) is contained in an amount of 0.1 part by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the polymerizable liquid crystal compound represented by the formula (I). The polymerizable liquid crystal composition according to the above [5] or [6].
[8] A cured product of the polymerizable liquid crystal composition according to any one of the above [5] to [7], wherein the polymerizable liquid crystal compound in the polymerizable liquid crystal composition is cured in an oriented state. A retardation film containing a liquid crystal cured film.
[9] The liquid crystal cured film has the formulas (1), (2) and (3):
Re (450) / Re (550) ≤ 1.00 (1)
1.00 ≤ Re (650) / Re (550) (2)
100 nm ≤ Re (550) ≤ 180 nm (3)
[In the formula, Re (λ) indicates the in-plane retardation value of the cured liquid crystal film at a wavelength of λ nm, and Re = (nx (λ) −ny (λ)) × d (d is the thickness of the cured liquid crystal film). Nx represents the main refractive index at a wavelength of λ nm in the direction parallel to the plane of the cured liquid crystal film in the refractive elliptical body formed by the cured liquid crystal film, and ny represents the main refractive index at the wavelength λ nm formed by the cured liquid crystal film. , Represents the refractive index at wavelength λ nm in the direction parallel to the plane of the liquid crystal cured film and orthogonal to the nx direction)]
The retardation film according to the above [8], which has the optical characteristics represented by.
[10] The liquid crystal cured film has the formulas (4), (5) and (6):
Rth (450) / Rth (550) ≤ 1.00 (4)
1.00 ≤ Rth (650) / Rth (550) (5)
-100nm ≤ Rth (550) ≤ -40nm (6)
[In the formula, Rth (λ) indicates the phase difference value in the thickness direction of the cured liquid crystal film at the wavelength λ nm, and Rth = ((nx (λ) + ny (λ)) / 2-nz) × d (d is). Represents the thickness of the cured liquid crystal film, nx represents the refractive index at the wavelength λ nm in the direction parallel to the plane of the cured liquid crystal film in the refractive index ellipse formed by the cured liquid crystal film, and ny represents the cured liquid crystal film. Refractive index In an elliptical body, it represents the refractive index at a wavelength of λ nm which is parallel to the plane of the cured liquid crystal film and perpendicular to the direction of nx, and nz is the refractive index formed by the cured liquid crystal film. In the elliptical body, it represents the refractive index at the wavelength λ nm in the direction perpendicular to the plane of the liquid crystal cured film)]
The retardation film according to the above [8], which has the optical characteristics represented by.
[11] An elliptical polarizing plate including the retardation film and the polarizing film according to any one of [8] to [10].
[12] An organic EL display device including the elliptical polarizing plate according to the above [11].
[13] A flexible image display device having the elliptical polarizing plate according to the above [11].
[14] The flexible image display device according to the above [13], further comprising a window and a touch panel touch sensor.

According to the present invention, it is possible to provide a polymerizable liquid crystal compound capable of exhibiting high solubility in a solvent by itself.

Hereinafter, embodiments of the present invention will be described in detail. The scope of the present invention is not limited to the embodiments described here, and various modifications can be made without impairing the gist of the present invention.

で表される。以下において、式（Ｉ）で表される重合性液晶化合物を「重合性液晶化合物（Ｉ）」ともいう。 <Polymerizable liquid crystal compound>
The polymerizable liquid crystal compound of the present invention has the formula (I):

It is represented by. Hereinafter, the polymerizable liquid crystal compound represented by the formula (I) is also referred to as “polymerizable liquid crystal compound (I)”.

M in the formula (I) represents a divalent alicyclic hydrocarbon group. The hydrogen atom contained in the divalent alicyclic hydrocarbon group is a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, and a cyano group. Alternatively, it may be substituted with a nitro group, and the carbon atom constituting the divalent alicyclic hydrocarbon group may be substituted with an oxygen atom, a sulfur atom or a nitrogen atom.

Examples of the divalent alicyclic hydrocarbon group in M in the formula (I) include a divalent alicyclic hydrocarbon group having 3 to 18 carbon atoms. The divalent alicyclic hydrocarbon group preferably has 4 to 15, more preferably 5 to 10, still more preferably 5 to 8, and particularly preferably 5 or 6.

The hydrogen atoms contained in the divalent alicyclic hydrocarbon group are independently halogen atoms, alkyl groups having 1 to 4 carbon atoms, fluoroalkyl groups having 1 to 4 carbon atoms, and alkoxy having 1 to 4 carbon atoms. It may be substituted with a group, a cyano group or a nitro group.

Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom, and a fluorine atom, a chlorine atom or a bromine atom is preferable.

Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group and the like, and an alkyl having 1 to 3 carbon atoms. The group is preferable, the alkyl group having 1 or 2 carbon atoms is more preferable, and the methyl group is further preferable.
Examples of the fluoroalkyl group having 1 to 4 carbon atoms include those in which the hydrogen atom contained in the alkyl group having 1 to 4 carbon atoms is replaced with a fluorine atom.

Examples of the alkoxy group having 1 to 4 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, an isobutoxy group, a sec-butoxy group, a tert-butoxy group and the like, and have 1 to 3 carbon atoms. An alkoxy group is preferable, an alkoxy group having 1 or 2 carbon atoms is more preferable, and a methoxy group is further preferable.

The carbon atom contained in the divalent alicyclic hydrocarbon group may be independently substituted with an oxygen atom, a sulfur atom or a nitrogen atom. One carbon atom may be substituted with an oxygen atom, a sulfur atom or a nitrogen atom, or two or more carbon atoms may be substituted with an oxygen atom, a sulfur atom or a nitrogen atom, respectively. _{For example, even if -CH 2-} (methylene group) contained in a divalent alicyclic hydrocarbon group is independently substituted with -O-, -S-, -NH- or -NR ^1-. Often, −CH (−) − contained in the alicyclic hydrocarbon group may be independently substituted with −N (−) −. Here, R ¹ represents an alkyl group having 1 to 4 carbon atoms, and the hydrogen atom contained in the alkyl group may be independently substituted with a fluorine atom.

Examples of the divalent alicyclic hydrocarbon group include groups represented by the following formulas (m-1) to (m-4). The divalent alicyclic hydrocarbon group in which −CH ₂ − contained in the alicyclic hydrocarbon group is substituted with −O−, −S−, −NH− or −NR ¹⁻ is represented by the following formula ( Examples thereof include groups represented by the formulas (m-5) to (m-8). The divalent alicyclic hydrocarbon group in which −CH (−) − contained in the alicyclic hydrocarbon group is replaced with −N (−) − includes the following formulas (m-9) and (m). Examples thereof include groups represented by -10). These are preferably 5- or 6-membered alicyclic hydrocarbon groups.

From the viewpoint of wavelength dispersibility, the divalent alicyclic hydrocarbon group is preferably a cycloalkanediyl group represented by the formula (M-1), and more preferably a cyclohexane-1,4-diyl group. More preferably, it is a trans-cyclohexane-1,4-diyl group.

^{B 1} and B ² in the formula (I) are independently alkylene groups having 1 to 4 carbon atoms, −O−, −S−, −R ^a1 OR ^a2- , −R ^a3 COOR ^a4- , −R, respectively. ^{a5 OCOR a6 -, - R a7} OC = OOR a8 -, - oR b O -, - C (= O) -NR c -, - N = N -, - CR c = CR d - or -C≡C- Is. R ^{a1 to} R ^a8 are independently single bonds or alkylene groups ^{having 1 to 4 carbon atoms, R b} is an alkylene group having 1 to 4 carbon atoms, and R ^c and R ^d are alkylene groups having 1 to 4 carbon atoms. It is an alkyl group or a hydrogen atom.

B ¹ and B ² are independently, preferably −OR ^a2-1 −, −CH _2- , −CH ₂ CH _2- , ^{−COOR a4-1} − or −OCOR ^a6-1 −, respectively. Here, R ^a2-1 , R ^a4-1 , and R ^a6-1 independently represent either single bond, -CH _2- or -CH ₂ CH _2-. B ¹ and B ² are independently, more preferably -O-, -CH ₂ CH _2- , _{-COO-, -COOCH 2} CH _2- or -OCO-, and even more preferably -O-,-. It is COO- or -OCO-, and particularly preferably -COO- or -OCO-. In formula (I), B ¹ and B ² may be the same or different from each other. Note that B ¹ and B ² are the same as each other means that the structures ^{of B 1} and B ² are the same when viewed with M as the center. Hereinafter, the same applies to the relationships between ^{A 1} and A ² , L ¹ and L ² , and E ^a and E ^b.

^{A 1} and A ² in the formula (I) independently represent a divalent alicyclic hydrocarbon group or an aromatic group. The hydrogen atom contained in the divalent alicyclic hydrocarbon group or aromatic group is a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, and an alkoxy having 1 to 4 carbon atoms. It may be substituted with a group, a cyano group or a nitro group. Further, the carbon atom constituting the divalent alicyclic hydrocarbon group or aromatic group may be substituted with an oxygen atom, a sulfur atom or a nitrogen atom.

^{Examples of the divalent alicyclic hydrocarbon group in A 1} and A ² in the formula (I) include the group exemplified as the divalent alicyclic hydrocarbon group in M. Examples of the divalent aromatic group include divalent aromatic hydrocarbon groups having about 6 to 20 carbon atoms represented by the following formulas (a-1) to (a-8).

Some of the hydrogen atoms of the groups represented by the above formulas (a-1) to (a-8) have about 1 to 4 carbon atoms such as a methyl group, an ethyl group, an i-propyl group or a t-butyl group. Alkyl group; alkoxy group having about 1 to 4 carbon atoms such as methoxy group or ethoxy group; trifluoromethyl group; trifluoromethyloxy group; cyano group; nitro group; It may be replaced.

^{A 1} and A ² in the formula (I) are independently, preferably a divalent aromatic group, and the hydrogen atom contained in the divalent aromatic group is a halogen atom and has 1 to 4 carbon atoms. It may be substituted with an alkyl group, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group, and a carbon atom constituting the divalent aromatic group. May be substituted with an oxygen atom, a sulfur atom or a nitrogen atom. A ¹ and A ² are each independently substituted with at least one substituent selected from the group consisting of a halogen atom and an alkyl group having 1 to 4 carbon atoms, respectively. It is more preferably a 1,4-phenylenediyl group which may be substituted with a methyl group, and particularly preferably an unsubstituted 1,4-phenylenediyl group. In formula (I), A ¹ and A ² may be the same or different from each other. At ^{least one of A 1} and A ² is preferably a divalent aromatic group, and from the viewpoint of exhibiting good liquid crystallinity ^{, both A 1} and A ² are 1,4-phenylenediyl groups. More preferably.

^{L 1} and L ^{2 in} formula (I) independently represent -O-, -COO- or -OCO-, respectively.

^{E a} and E ^b in the formula (I) independently represent an alkanediyl group having 1 to 12 carbon atoms. The hydrogen atom contained in the alkanediyl group may be substituted with an alkyl group having 1 to 4 carbon atoms or a halogen atom. _{Further, —CH 2} − contained in the alkanediyl group and not adjacent to ^{L 1} or L ² may be substituted with −O − or −S−. However, when a plurality of -O- and / or -S- are present in ^{E a} and E ^{b, they are not adjacent to each other.}

The ^{number of carbon atoms in the alkanediyl group represented by E a} and E ^b is independently, preferably 2 or more, more preferably 3 or more, and preferably 11 or less, more preferably 8 or less.

In formula (I), if the lesser of the total number of carbon atoms in the groups represented by the sum and E ^b of the number of carbon atoms in the groups represented by E ^a N1, the larger amount was N2, N1 is It is 2 to 6, and N2 is 6 to 12. Further, N1 and N2 satisfy the relationship of 1 <N2-N1 <10. ^{The group represented by E a} and the group represented by E ^b in the formula (I) each have the specific number of carbon atoms, and the number of carbon atoms of both is more than 1 and less than 10. If there is, the solubility in various solvents (for example, cyclopentanone, o-xylene, 2-methylpyrrolidone, chloroform) is likely to be improved. The reason is not clear, but it is considered that the compound has an asymmetrical structure, so that it is difficult to precipitate, and as a result, the solubility is improved. The value of N2-N1 is preferably 2 or more, more preferably 3 or more, and preferably 9 or less, more preferably 8 or less, still more preferably 7 or less.
In the present specification, the total number of carbon atoms in the groups represented by the sum and E ^b of the number of carbon atoms in the groups represented by E ^a, respectively, the main of the compound represented by formula (I) It means the total number of carbon atoms constituting the chain, and does not include the number of carbon atoms contained as a substituent in the carbon constituting the main chain.

In formula (I), P is an acryloyloxy group or a methacryloyloxy group.

In the formula (I), since E ^a and E ^b have different structures from each other, the polymerizable liquid crystal compound (I) is P-E ^{a centering on a divalent alicyclic hydrocarbon group represented by M.} The ^{structure represented by −L 1} −A ¹ −B ¹ − and the structure represented by −B ² −A ² −L ² −E ^b −P have an asymmetric molecular structure. The polymerizable liquid crystal compound (I) has the same ring structure symmetrically with respect to the divalent alicyclic hydrocarbon group represented by M, that is, A ¹ and A ² are the same. ^{It is preferable that the structure represented by P-E a-} L ^1- A ^1- B ^1- and the structure represented by -B ^2- A ^2- L ^2- E ^b- P in the formula (I). There an asymmetrical only in the structure of an asymmetric molecular structure ^{E a} and ^{E b,} i.e., it is more preferable ^{B 1} and the ^B 2, ^{a 1} and ^{a 2} and ^{L 1} and ^{L 2} is a structure identical to each other ..

Examples of the polymerizable liquid crystal compound (I) include compounds represented by the following formulas (Ia) to (Ig).

The method for producing the polymerizable liquid crystal compound (I) of the present invention is not particularly limited, and is described in Molecular der Organic Synthesis, Organic Reactions, Organic Synthesis, Comprehensive Organic Synthesis, Synthetic Synthetic Synthesis, , Condensation reaction, esterification reaction, Williamson reaction, Ulmann reaction, Wittich reaction, Schiff base formation reaction, benzylation reaction, Sonoto reaction, Suzuki-Miyaura reaction, Negishi reaction, Kumada reaction, Hiyama reaction, Buchwald-Heartwig reaction , Friedelcraft reaction, Heck reaction, Aldor reaction, etc.) can be produced by appropriately combining them according to their structure.

〔式（Ｉ’）中、Ｍ、Ａ^１、Ａ^２、Ｌ^１、Ｌ^２、Ｅ^ａ、Ｅ^ｂおよびＰは、それぞれ、式（Ｉ）中のＭ、Ａ^１、Ａ^２、Ｌ^１、Ｌ^２、Ｅ^ａ、Ｅ^ｂおよびＰと同じ意味を表す。〕

〔式（Ｉ−１）中、Ｍ、Ｂ^１、Ａ^１、Ｌ^１、Ｅ^ａおよびＰは、式（Ｉ）中のＭ、Ｂ^１、Ａ^１、Ｌ^１、Ｅ^ａおよびＰと同じ意味を表す。〕

〔式（Ｉ−２）中、Ａ^２、Ｌ^２、Ｅ^ｂおよびＰは、式（Ｉ）中のＡ^２、Ｌ^２、Ｅ^ｂおよびＰと同じ意味を表す。〕 ^{For example, a polymerizable liquid crystal compound represented by the following formula (I') in which B 1} and B ² in the formula (I) are * -COO- (* means a binding site with M) is represented by the following formula. It can be obtained by an esterification reaction between the carboxylic acid compound represented by (I-1) and the alcohol compound represented by the formula (I-2).

[In formula (I'), M, A ¹ , A ² , L ¹ , L ² , E ^a , E ^{b, and P are M, A 1} , A ² , L ¹ , and P in formula (I), respectively. It has the same meaning as L ² , E ^a , E ^{b and P.} ]

Wherein ^{(I-1), M,} B 1, A 1, L 1, E a and P, ^M in formula ^{(I), B 1, A} 1, L 1, the same meaning as ^{E a} and P Represents. ]

Wherein ^{(I-2), A 2} , L 2, E b and P have the same meanings as ^{A 2,} L ^{2, E b} and P in the formula (I). ]

M, B ¹ , A ¹ , L ¹ , E ^a and P in the formula (I-1) and A ² , L ² , E ^b and P in the formula (I-2) are the desired polymerizable properties. It is determined according to the corresponding molecular structure of the liquid crystal compound (I).

The compound represented by the formula (I-1) and the compound represented by the formula (I-2) are M, B ¹ , A ¹ , L ¹ , E ^a and P, or A ² , L ^{2, respectively.} , E ^b and P can be produced by synthesizing and binding each structural unit of, E b and P by appropriately combining known organic synthesis reactions according to the structure. Specifically, for example, it can be prepared from a compound having a structure corresponding to the desired structure of the polymerizable liquid crystal compound (I) according to the method described in JP-A-2010-24438.

〔式（Ｉ−１ａ）中、Ｍは式（Ｉ）中のＭと同じ意味を表す。〕
で表されるジカルボン酸化合物（Ｉ−１ａ）と、下記式（Ｉ−１ｂ）：

〔式（Ｉ−１ｂ）中、Ａ^１、Ｌ^１、Ｅ^ａおよびＰは、式（Ｉ）中のＡ^１、Ｌ^１、Ｅ^ａおよびＰと同じ意味を表す。〕
で表されるアルコール化合物（Ｉ−１ｂ）とのエステル化反応により得ることができる。 For example, ^{when B 1 in} the formula (I-1) is −COO−, the compound represented by the formula (I-1) is the following formula (I-1a) :.

[In formula (I-1a), M has the same meaning as M in formula (I). ]
The dicarboxylic acid compound (I-1a) represented by and the following formula (I-1b):

Wherein ^{(I-1b), A 1} , L 1, E a and P have the same meanings as ^{A 1,} L ^{1, E a} and P in the formula (I). ]
It can be obtained by an esterification reaction with the alcohol compound (I-1b) represented by.

The compound represented by the formula (I-2) is a divalent alicyclic hydrocarbon group corresponding to the alicyclic hydrocarbon group M in the formula (I) in the desired polymerizable liquid crystal compound (I). On the other hand, a compound in which two carboxyl groups are bonded can be mentioned.

The esterification reaction of the carboxylic acid compound (I-1) and the alcohol compound (I-2) is preferably carried out in the presence of a condensing agent. By carrying out the esterification reaction in the presence of a condensing agent, the esterification reaction can be carried out efficiently and rapidly.

Examples of the condensing agent include 1-cyclohexyl-3- (2-morpholinoethyl) carbodiimidemeth-para-toluenesulfonate, dicyclohexylcarbodiimide, diisopropylcarbodiimide, 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide, 1-. Carbodiimide compounds such as ethyl-3- (3-dimethylaminopropyl) carbodiimide hydrochloride (water-soluble carbodiimide: commercially available as WSC), bis (2,6-diisopropylphenyl) carbodiimide, and bis (trimethylsilyl) carbodiimide, 2-methyl- 6-Nitrobenzoic acid anhydride, 2,2'-carbonylbis-1H-imidazole, 1,1'-oxalyldiimidazole, diphenylphosphoryl azide, 1 (4-nitrobenzenesulfonyl) -1H-1, 2, 4 -Triazole, 1H-benzotriazole-1-yloxytripyrrolidinophosphonium hexafluorophosphate, 1H-benzotriazole-1-yloxytris (dimethylamino) phosphonium hexafluorophosphate, N, N, N', N'-tetra Methyl-O- (N-succinimidyl) uronium tetrafluoroborate, N- (1,2,2,2-tetrachloroethoxycarbonyloxy) succinimide, N-carbodibenzoxis succinimide, O- (6-chlorobenzotriazole-) 1-yl) -N, N, N', N'-tetramethyluronium tetrafluoroborate, O- (6-chlorobenzotriazole-1-yl) -N, N, N', N'-tetramethyluro Nium hexafluorophosphate, 2-bromo-1-ethylpyridinium tetrafluoroborate, 2-chloro-1,3-dimethylimidazolinium chloride, 2-chloro-1,3-dimethylimidazolinium hexafluorophosphate, 2-chloro Examples thereof include -1-methylpyridinium iodide, 2-chloro-1-methylpyridinium para-toluenesulfonate, 2-fluoro-1-methylpyridinium para-toluenesulfonate and trichloroacetic acid pentachlorophenyl ester.

で表される重合性液晶化合物（以下、「重合性液晶化合物（ＩＩ）」ともいう）を含む重合性液晶組成物に配合した場合でも、溶剤に対する溶解性がよい。 The polymerizable liquid crystal compound (I) of the present invention has the following formula (II):

Even when blended in a polymerizable liquid crystal composition containing a polymerizable liquid crystal compound represented by (hereinafter, also referred to as "polymerizable liquid crystal compound (II)"), the solubility in a solvent is good.

Ar in the formula (II) is a divalent group having at least one aromatic ring, and the aromatic ring constituting the divalent group contains at least one of a nitrogen atom, an oxygen atom and a sulfur atom. You may. Examples of the divalent group having an aromatic ring include a divalent aromatic hydrocarbon group which may have a substituent or a divalent aromatic heterocyclic group. In the present invention, the divalent aromatic hydrocarbon group which may have a substituent means a divalent group containing at least one aromatic hydrocarbon ring, and may have a substituent. A divalent aromatic heterocyclic group means a divalent group containing at least one aromatic heterocyclic ring. The aromatic hydrocarbon ring and the aromatic heterocycle referred to here are those in which the number of π electrons of the ring structure is [4n + 2] (n represents an integer) according to Hückel's law (in the case of an aromatic heterocycle, the aromatic heterocycle). Hückel's law is satisfied including non-covalently bonded electron pairs on heteroatoms such as −N = and −S−). Ar may contain one aromatic hydrocarbon ring or aromatic heterocycle, or may contain two or more aromatic rings. When one aromatic hydrocarbon ring or aromatic heterocycle is contained, Ar may be a divalent aromatic hydrocarbon group which may have a substituent or may have a substituent. It may be a divalent aromatic heterocyclic group. When two or more aromatic hydrocarbon rings or aromatic heterocycles are contained, only the aromatic hydrocarbon ring or only a plurality of aromatic heterocycles may be contained, and the aromatic hydrocarbon ring and the aromatic heterocycle may be contained. May contain one or more of each. Two or more aromatic hydrocarbon rings and / or aromatic heterocycles may be bonded to each other by a single bond or a divalent bonding group such as −CO—O−, −O−.

Examples of the aromatic hydrocarbon ring contained in Ar include a benzene ring, a naphthalene ring, an anthracene ring and the like, and a benzene ring and a naphthalene ring are preferable. Examples of the aromatic heterocycle include a furan ring, a benzofuran ring, a pyrrole ring, an indole ring, a thiophene ring, a benzothiophene ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, a triazole ring, a triazine ring, a pyrrolin ring, an imidazole ring, and a pyrazole ring. Examples thereof include a thiazole ring, a benzothiazole ring, a thienothiazole ring, an oxazole ring, a benzoxazole ring, and a phenanthroline ring. Among them, it is preferable to have a thiazole ring, a benzothiazole ring, or a benzofuran ring, and it is more preferable to have a benzothiazole group. When Ar contains a nitrogen atom, the nitrogen atom preferably has π electrons.

In the formula (II), the total number N _π of π electrons contained in Ar is preferably 12 or more, more preferably 14 or more, and further preferably 16 or more. Further, it is preferably less than 40, more preferably 36 or less, still more preferably 34 or less, and particularly preferably 32 or less.

Examples of the aromatic group represented by Ar include the following groups.

In formulas (Ar-1) to (Ar-23), * marks represent connecting parts, and Z ⁰ , Z ¹ and Z ² are independently hydrogen atoms, halogen atoms, and alkyl having 1 to 12 carbon atoms. Group, cyano group, nitro group, alkylsulfinyl group having 1 to 12 carbon atoms, alkylsulfonyl group having 1 to 12 carbon atoms, carboxyl group, fluoroalkyl group having 1 to 12 carbon atoms, alkoxy group having 1 to 12 carbon atoms, Alkylthio group having 1 to 12 carbon atoms, N-alkylamino group having 1 to 12 carbon atoms, N, N-dialkylamino group having 2 to 12 carbon atoms, N-alkylsulfamoyl group having 1 to 12 carbon atoms or carbon Represents an N, N-dialkylsulfamoyl group of number 2-12. Further, Z ⁰ , Z ¹ and Z ² may contain a polymerizable group.

Q ¹ and ^{Q 2} each ^{independently, -CR 2 'R 3' -} , - S -, - NH -, - NR 2 '-, - CO- or -O- and represents, R ^2' and ^{R 3 '} Independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

J ¹ and J ² independently represent a carbon atom or a nitrogen atom, respectively.

Y ¹ , Y ² and Y ³ each independently represent an aromatic hydrocarbon group or an aromatic heterocyclic group which may be substituted.

W ¹ and W ² independently represent a hydrogen atom, a cyano group, a methyl group or a halogen atom, and m represents an integer of 0 to 6.

Examples of the aromatic hydrocarbon group in Y ¹ , Y ² and Y ³ include an aromatic hydrocarbon group having 6 to 20 carbon atoms such as a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group and a biphenyl group, and a phenyl group. , A naphthyl group is preferable, and a phenyl group is more preferable. The aromatic heterocyclic group has 4 to 20 carbon atoms containing at least one heteroatom such as a nitrogen atom such as a frill group, a pyrrolyl group, a thienyl group, a pyridinyl group, a thiazolyl group or a benzothiazolyl group, an oxygen atom and a sulfur atom. Aromatic heterocyclic groups are mentioned, and a frill group, a thienyl group, a pyridinyl group, a thiazolyl group, and a benzothiazolyl group are preferable.

Y ¹ , Y ² and Y ³ may be independently substituted polycyclic aromatic hydrocarbon groups or polycyclic aromatic heterocyclic groups, respectively. The polycyclic aromatic hydrocarbon group refers to a condensed polycyclic aromatic hydrocarbon group or a group derived from an aromatic ring assembly. The polycyclic aromatic heterocyclic group refers to a condensed polycyclic aromatic heterocyclic group or a group derived from an aromatic ring assembly.

Z ⁰ , Z ¹ and Z ² are preferably hydrogen atoms, halogen atoms, alkyl groups having 1 to 12 carbon atoms, cyano groups, nitro groups, and alkoxy groups having 1 to 12 carbon atoms, respectively. ⁰ is more preferably a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, and a cyano group, and Z ¹ and Z ² are further preferably a hydrogen atom, a fluorine atom, a chlorine atom, a methyl group, and a cyano group. Further, Z ⁰ , Z ¹ and Z ² may contain a polymerizable group.

Q ¹ and ^{Q 2,} -NH -, - S -, - NR 2 '-, - O- are preferable, R ^2' is preferably a hydrogen atom. Of these, -S-, -O-, and -NH- are particularly preferable.

Among the formulas (Ar-1) to (Ar-23), the formulas (Ar-6) and (Ar-7) are preferable from the viewpoint of molecular stability.

In formulas (Ar-16) to (Ar-23), Y ¹ may form an aromatic heterocyclic group with the nitrogen atom to which it is attached and Z ^0. Examples of the aromatic heterocyclic group include those described above as the aromatic heterocycle that Ar may have. For example, a pyrrole ring, an imidazole ring, a pyrroline ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, and an indole. Examples thereof include a ring, a quinoline ring, an isoquinoline ring, a purine ring, and a pyrroline ring. This aromatic heterocyclic group may have a substituent. Further, Y ¹ may be a polycyclic aromatic hydrocarbon group or a polycyclic aromatic heterocyclic group which may be substituted as described above, together with the nitrogen atom to which ^{the Y 1 is bonded and Z 0.} For example, a benzofuran ring, a benzothiazole ring, a benzoxazole ring and the like can be mentioned.

^{The groups G 1} and G ² in the formula (II) are the same as the groups exemplified as the divalent alicyclic hydrocarbon groups ^{in the formulas (I) A 1} and A ² in the polymerizable liquid crystal compound (I). The group is mentioned. G ¹ and G ² are preferably a 5- or 6-membered alicyclic hydrocarbon group, more preferably a 6-membered alicyclic hydrocarbon group, and even more preferably cyclohexane-1. , 4-Diyl group, particularly preferably trans-cyclohexane-1,4-Diyl group. In formula (II), G ¹ and G ² may be the same or different from each other.

^{B 3} and B ^{4 in} formula (II) independently represent a single bond or a divalent linking group, respectively. Examples of the divalent linking group in B ³ and B ⁴ include the same groups as those exemplified as ^{B 1} and B ² in the formula (I) in the polymerizable liquid crystal compound (I). ^{B 3} and B ⁴ in the formula (II) are independently, preferably single bonds, alkylene groups having 1 to 4 carbon atoms, -O-, -S-, -R ^a1 OR ^a2- , -R ^{a3. COOR a4 -, - R a5 OCOR} a6 -, - R a7 OC = OOR a8 -, - N = N -, - CR c = CR d - or -C≡C-. Here, R ^{a1 to} R ^a8 independently represent a single bond or an alkylene group having 1 to 4 carbon atoms, and R ^c and R ^d represent an alkyl group or a hydrogen atom having 1 to 4 carbon atoms. B ³ and ^{B 4} are each independently more preferably a single _{^{bond, -OR a2-1 -, - CH 2}} -, - CH 2 CH 2 -, - COOR a4-1 -, or ^{-OCOR a6-1} - (R ^a2-1 , R ^a4-1 , and R ^a6-1 each independently represent either single bond, -CH _{2- , -CH 2} CH _2- ), and more preferably single bond, -O. -, -CH ₂ CH _2- , _{-COO-, -COOCH 2} CH _2- , or -OCO-, and particularly preferably -COO- or -OCO-. In formula (II), B ³ and B ⁴ may be the same or different from each other.

^{A 3} and A ⁴ in the formula (II) independently represent a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms or a divalent aromatic hydrocarbon group having 6 to 20 carbon atoms. The alicyclic hydrocarbon group and the hydrogen atom contained in the aromatic hydrocarbon group may be substituted with a halogen atom or a fluorine atom, or may be substituted with an alkyl group having 1 to 4 carbon atoms or a fluorine atom. It may be substituted with a good alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group. _{Further, −CH 2} − contained in the alicyclic hydrocarbon group may be replaced by −O−, −S− or −NR ¹⁻ , and −CH (contained in the alicyclic hydrocarbon group) ( -)-May be replaced by -N (-)-. The R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

Formula Examples of the alicyclic hydrocarbon group and an aromatic hydrocarbon group for A ³ and A ⁴ in (II), polymerizable groups exemplified as A ¹ and A ² in formula (I) in a liquid crystal compound (I) The same group as. In formula (II), A ³ and A ⁴ may be independently substituted with at least one substituent preferably selected from the group consisting of a halogen atom and an alkyl group having 1 to 4 carbon atoms1. , 4-Penylenedyl group, a 1,4-cyclohexanediyl group which may be substituted with at least one substituent selected from the group consisting of a halogen atom and an alkyl group having 1 to 4 carbon atoms, more preferably methyl. A group-substituted 1,4-phenylenediyl group, an unsubstituted 1,4-phenylenediyl group, or an unsubstituted 1,4-cyclohexanediyl group, particularly preferably an unsubstituted 1,4-phenylenediyl group. It is a group or unsubstituted 1,4-cyclohexanediyl group. In formula (II), A ¹ and A ² may be the same or different from each other.

^{L 3 to} L ⁶ in the formula (II) independently represent -O-, -COO- or -OCO-, respectively. In formula (II), L ^{3 to} L ⁶ may be the same or different from each other.

^{E c} and ^{E d} in formula (II) each independently represent an alkanediyl group of 1 to 17 carbon atoms. The hydrogen atom contained in the alkanediyl group may be replaced with a halogen atom, and -CH _2- contained in the alkanediyl group may be replaced with -O- or -CO-. Wherein (II), E ^c and E ^d are each independently preferably an alkanediyl group of carbon atoms which may be have 4 to 17 substitution, and more preferably in the carbon number 4 to be substituted There are 12 alkanediyl groups. Wherein (II), ^{E c} and ^{E d} may be the being the same or different.

^{P 1} and P ^{2 in} formula (II) each independently represent a polymerizable group. The ^{polymerizable group represented by P 1} or P ² includes an epoxy group, a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, and an oxylanyl group. And an oxetanyl group and the like. Among them, an acryloyloxy group, a methylenedioxy group, a vinyl group and a vinyloxy group are preferable, an acryloyloxy group and a methacryloyloxy group are more preferable, and an acryloyloxy group is further preferable. In formula (II), P ¹ and P ² may be the same or different.

Examples of the polymerizable liquid crystal compound (II) include compounds described in JP-A-2011-207765, JP-A-2008-107767, WO2014 / 01325, JP-A-2019-0031777, and the like. Can be mentioned.

The polymerizable liquid crystal compound (II) is preferably a polymerizable liquid crystal compound that exhibits maximum absorption in the wavelength range of 300 nm or more and 400 nm or less. When the polymerizable liquid crystal composition contains a photopolymerization initiator, the polymerization reaction and gelation of the polymerizable liquid crystal compound may proceed during long-term storage. However, if the maximum absorption wavelength of the polymerizable liquid crystal compound (II) is within the range of 300 nm or more and 400 nm or less, even if ultraviolet light is exposed during storage, the generation of reactive species from the photopolymerization initiator and the reaction activity thereof. It is possible to effectively suppress the polymerization reaction and the progress of gelation of the polymerizable liquid crystal compound depending on the species. Therefore, it is advantageous in terms of long-term stability of the polymerizable liquid crystal composition, and the orientation and film thickness uniformity of the obtained liquid crystal cured film can be improved. The maximum absorption wavelength of the polymerizable liquid crystal compound (II) can be measured in a solvent using an ultraviolet-visible spectrophotometer. The solvent is a solvent capable of dissolving the polymerizable liquid crystal compound (II), and examples thereof include chloroform.

The polymerizable liquid crystal composition of the present invention contains a polymerizable liquid crystal compound (I) and a polymerizable liquid crystal compound (II). As the polymerizable liquid crystal compound (I) and the polymerizable liquid crystal compound (II), only one type may be contained, or two or more types may be contained in combination.

Since the polymerizable liquid crystal composition of the present invention has high solubility in the solvent of the polymerizable liquid crystal compound, the occurrence of orientation defects due to precipitation, precipitation, etc. of the undissolved polymerizable liquid crystal compound or the polymerizable liquid crystal compound during storage. Excellent effect of suppressing. Therefore, by using the polymerizable liquid crystal composition of the present invention, it is possible to form a film without deteriorating the optical characteristics that the polymerizable liquid crystal compound can originally develop, and the liquid crystal curing having excellent optical characteristics can be achieved. A film can be obtained. Further, as compared with the case where the polymerizable liquid crystal compound (I) is dissolved alone in a solvent, a larger amount of the polymerizable liquid crystal compound can be easily dissolved in the same amount or a smaller amount of solvent. .. Furthermore, it may be possible to dissolve the polymerizable liquid crystal compound (I) or (II) alone in a solvent that can hardly or not dissolve at all. As a result, the undissolved polymerizable liquid crystal compound is unlikely to remain in the coating liquid, high coatability at the time of film formation can be ensured, and the polymerizable liquid crystal composition having excellent film formation is obtained. Furthermore, the amount of solvent required to prepare the coating liquid can be reduced, and as the types of solvents that can be selected increase, the choices such as the base material, alignment film, and manufacturing conditions to be used increase. It is also advantageous in.

From the viewpoint of easily improving the compatibility with the polymerizable liquid crystal compound (I) and improving the solubility of the polymerizable liquid crystal compound (II) in a solvent, the polymerizable liquid crystal compound (I) and the polymerizable liquid crystal compound (II) are easily improved. ) And have similar structures to each other, and B ^{3 and B 4} in the formula (II) are the same ^{as B 1} and B ² in the formula (I), respectively, and in the formula (II). G ¹ and G ² are the ^{same as A 1} and A ^{2 in the} formula (I), respectively, and L ^{3 and L 4} in the formula (II) are the same ^{as L 1} and L ² in the formula (I), respectively. ^{It is preferable that P 1} and P ² in the formula (II) are the same as P in the formula (I), respectively.

The polymerizable liquid crystal composition of the present invention contains the polymerizable liquid crystal compound (I) with respect to 100 parts by mass of the polymerizable liquid crystal compound (II), preferably 1 part by mass or more and 70 parts by mass or less, more preferably 1 part by mass or more. It is contained in an amount of 50 parts by mass or less, more preferably 2 parts by mass or more and 30 parts by mass or less. It is preferable that the content of the polymerizable liquid crystal compound (I) with respect to the polymerizable liquid crystal compound (II) is at least the above lower limit value from the viewpoint of wavelength dispersion. Further, when it is not more than the above upper limit, the solubility is easily improved sufficiently.

The polymerizable liquid crystal composition of the present invention may contain a polymerizable liquid crystal compound other than the polymerizable liquid crystal compound (I) and the polymerizable liquid crystal compound (II) as long as it does not affect the effects of the present invention. Examples of such a polymerizable liquid crystal compound include a polymerizable liquid crystal compound having the ^{same E a} and E ^b in the formula (I) and generally exhibiting positive wavelength dispersibility.

When the polymerizable liquid crystal composition of the present invention contains a polymerizable liquid crystal compound other than the polymerizable liquid crystal compounds (I) and (II), the polymerizable liquid crystal composition can be used from the viewpoint of obtaining a liquid crystal cured film having excellent optical properties. The total mass of the polymerizable liquid crystal compounds (I) and (II) with respect to the total mass of the total polymerizable liquid crystal compounds contained is preferably 51% by mass or more, more preferably 70% by mass or more, still more preferably 90. It is mass% or more, and may be 100 mass%.

The content of the polymerizable liquid crystal compound in the polymerizable liquid crystal composition (total amount of all the polymerizable liquid crystal compounds) is, for example, 70 to 99.5 parts by mass with respect to 100 parts by mass of the solid content of the polymerizable liquid crystal composition. It is preferably 80 to 99 parts by mass, more preferably 85 to 98 parts by mass, and further preferably 90 to 95 parts by mass. When the content of the polymerizable liquid crystal compound is within the above range, it is advantageous from the viewpoint of the orientation of the obtained liquid crystal cured film. In the present specification, the solid content of the polymerizable liquid crystal composition means all the components of the polymerizable liquid crystal composition excluding volatile components such as organic solvents.

In the polymerizable liquid crystal composition of the present invention, in addition to the polymerizable liquid crystal compounds (I) and (II), additives such as a photopolymerization initiator, an organic solvent, a polymerization inhibitor, a photosensitizer, and a leveling agent are further added. It may be included. As each of these components, only one kind may be used, or two or more kinds may be used in combination.

The polymerizable liquid crystal composition of the present invention preferably contains a polymerization initiator. The polymerization initiator is a compound capable of producing a reactive species by the contribution of heat or light and initiating a polymerization reaction of a polymerizable liquid crystal display or the like. Examples of the reactive active species include active species such as radicals, cations and anions. Of these, a photopolymerization initiator that generates radicals by light irradiation is preferable from the viewpoint of easy reaction control.

Examples of the photopolymerization initiator include benzoin compounds, benzophenone compounds, benzyl ketal compounds, α-hydroxyketone compounds, α-aminoketone compounds, triazine compounds, iodonium salts and sulfonium salts. Specifically, Irgacure (registered trademark) 907, Irgacure 184, Irgacure 651, Irgacure 819, Irgacure 250, Irgacure 369, Irgacure 379, Irgacure 127, Irgacure 2959, Irgacure 754, Irgacure 379EG (above, BASF Japan Co., Ltd.) (Made), Sakeol BZ, Sakeol Z, Sakeol BEE (manufactured by Seiko Kagaku Co., Ltd.), Kayacure BP100 (manufactured by Nippon Kayaku Co., Ltd.), Kayacure UVI-6992 (manufactured by Dow), ADEKA PUTMER SP- 152, ADEKA OPTMER SP-170, ADEKA OPTMER N-1717, ADEKA PTMER N-1919, ADEKA ARCLUDS NCI-831, ADEKA ARCULDS NCI-930 (all manufactured by ADEKA Corporation), TAZ-A, TAZ -PP (above, manufactured by Nippon Sibel Hegner) and TAZ-104 (manufactured by Sanwa Chemical Co., Ltd.) can be mentioned.
In the present invention, the polymerizable liquid crystal composition preferably contains at least one kind of photopolymerization initiator, and may contain two or more kinds of photopolymerization initiators.

Since the photopolymerization initiator can fully utilize the energy emitted from the light source and is excellent in productivity, the maximum absorption wavelength is preferably 300 nm to 400 nm, more preferably 300 nm to 380 nm, and above all, the α-acetophenone type. A polymerization initiator and an oxime-based photopolymerization initiator are preferable.

Examples of the α-acetophenone-based polymerization initiator include 2-methyl-2-morpholino-1- (4-methylsulfanylphenyl) propan-1-one and 2-dimethylamino-1- (4-morpholinophenyl) -2-benzyl. Examples thereof include butane-1-one and 2-dimethylamino-1- (4-morpholinophenyl) -2- (4-methylphenylmethyl) butane-1-one, and more preferably 2-methyl-2-morpholino-. Included are 1- (4-methylsulfanylphenyl) propan-1-one and 2-dimethylamino-1- (4-morpholinophenyl) -2-benzylbutane-1-one. Examples of commercially available α-acetophenone compounds include Irgacure 369, 379EG, 907 (above, manufactured by BASF Japan Ltd.) and Sequol BEE (manufactured by Seiko Kagaku Co., Ltd.).

Oxime-based photopolymerization initiators generate methyl radicals when irradiated with light. The methyl radicals preferably allow the polymerization of the polymerizable liquid crystal compound in the deep part of the liquid crystal cured film to be formed. Further, from the viewpoint of more efficiently advancing the polymerization reaction in the deep part of the formed liquid crystal cured film, it is preferable to use a photopolymerization initiator capable of efficiently utilizing ultraviolet rays having a wavelength of 350 nm or more. As the photopolymerization initiator capable of efficiently utilizing ultraviolet rays having a wavelength of 350 nm or more, a triazine compound and an oxime ester type carbazole compound are preferable, and an oxime ester type carbazole compound is more preferable from the viewpoint of sensitivity. Examples of the oxime ester-type carbazole compound include 1,2-octanedione, 1- [4- (phenylthio) -2- (O-benzoyloxime)], etanone, 1- [9-ethyl-6- (2-methylbenzoyl)]. ) -9H-carbazole-3-yl] -1- (O-acetyloxime) and the like. Commercially available products of the oxime ester-type carbazole compound include Irgacure OXE-01, Irgacure OXE-02, Irgacure OXE-03 (above, manufactured by BASF Japan Ltd.), ADEKA OPTMER N-1919, and ADEKA ARCLUS NCI-831 (above). , Made by ADEKA CORPORATION) and the like.

The amount of the photopolymerization initiator added is usually 0.1 part by mass or more and 30 parts by mass or less, preferably 0.5 parts by mass or more, and more preferably 1 part by mass with respect to 100 parts by mass of the polymerizable liquid crystal compound. The above is preferably 20 parts by mass or less, and more preferably 15 parts by mass or less. Within the above range, the reaction of the polymerizable group proceeds sufficiently, and the orientation of the polymerizable liquid crystal compound is not easily disturbed.

In the present invention, the polymerizable liquid crystal composition is usually applied to a substrate or the like in a state of being dissolved in a solvent, and therefore preferably contains a solvent. As the solvent, a solvent capable of dissolving the polymerizable liquid crystal compound constituting the polymerizable liquid crystal composition such as the polymerizable liquid crystal compounds (I) and (II) is preferable, and the solvent is inactive in the polymerization reaction of the polymerizable liquid crystal compound. It is preferably a solvent. Examples of the solvent include water, methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, ethylene glycol methyl ether, ethylene glycol butyl ether, 1-methoxy-2-propanol, 2-butoxyethanol and alcohols such as propylene glycol monomethyl ether. Solvents: Ester solvents such as ethyl acetate, butyl acetate, ethylene glycol methyl ether acetate, γ-butyrolactone, propylene glycol methyl ether acetate and ethyl lactate; acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone and methyl isobutyl ketone. Ketone solvent; aliphatic hydrocarbon solvent such as pentane, hexane and heptane; alicyclic hydrocarbon solvent such as ethylcyclohexane; aromatic hydrocarbon solvent such as toluene and xylene; nitrile solvent such as acetonitrile; tetrahydrofuran and dimethoxyethane and the like Ether solvent; chlorine-containing solvent such as chloroform and chlorobenzene; amide-based solvent such as dimethylacetamide, dimethylformamide, N-methyl-2-pyrrolidone (NMP), 1,3-dimethyl-2-imidazolidinone, etc. Be done. These solvents can be used alone or in combination of two or more. Among these, organic solvents are preferable, and alcohol solvents, ester solvents, ketone solvents, chlorine-containing solvents, amide solvents and aromatic hydrocarbon solvents are more preferable.

The content of the solvent in the polymerizable liquid crystal composition is preferably 50 to 98 parts by mass, and more preferably 70 to 95 parts by mass with respect to 100 parts by mass of the polymerizable liquid crystal composition. Therefore, the solid content in 100 parts by mass of the polymerizable liquid crystal composition is preferably 2 to 50 parts by mass, more preferably 5 to 30 parts by mass. When the solid content is 50 parts by mass or less, the viscosity of the polymerizable liquid crystal composition tends to be low, the thickness of the film tends to be substantially uniform, and unevenness tends to be less likely to occur. The solid content can be appropriately determined in consideration of the thickness of the liquid crystal cured film to be produced.

By blending a polymerization inhibitor, the polymerization reaction of the polymerizable liquid crystal compound can be controlled. Polymerization inhibitors include hydroquinones having substituents such as hydroquinone and alkyl ethers; catechols having substituents such as alkyl ethers such as butyl catechol; pyrogallols, 2,2,6,6-tetramethyl-1- Radical trapping agents such as piperidinyloxy radicals; thiophenols; β-naphthylamines and β-naphthols. In order to polymerize the polymerizable liquid crystal compound without disturbing the orientation, the content of the polymerization inhibitor is usually 0.01 to 10 parts by mass with respect to 100 parts by mass of the polymerizable liquid crystal compound, and is preferably 0. It is 1 to 5 parts by mass, more preferably 0.1 to 3 parts by mass.

Furthermore, by using a sensitizer, the photopolymerization initiator can be made highly sensitive. Examples of the photosensitizer include xanthones such as xanthones and thioxanthones; anthracenes having substituents such as anthracene and alkyl ethers; phenothiazines; rubrenes. Examples of the photosensitizer include xanthones such as xanthones and thioxanthones; anthracenes having substituents such as anthracene and alkyl ethers; phenothiazines; rubrenes. The content of the photosensitizer is usually 0.01 to 10 parts by mass, preferably 0.05 to 5 parts by mass, and more preferably 0.1 to 1 part by mass with respect to 100 parts by mass of the polymerizable liquid crystal compound. 3 parts by mass.

Furthermore, the polymerizable liquid crystal composition of the present invention may contain a leveling agent. The leveling agent is an additive having a function of adjusting the fluidity of the polymerizable liquid crystal composition and flattening the film obtained by applying the leveling agent, for example, silicone-based, polyacrylate-based and perfluoroalkyl-based. Leveling agent can be mentioned. Specifically, DC3PA, SH7PA, DC11PA, SH28PA, SH29PA, SH30PA, ST80PA, ST86PA, SH8400, SH8700, FZ2123 (all manufactured by Toray Dow Corning Co., Ltd.), KP321, KP323, KP324, KP326, KP340, KP341, X22-161A, KF6001 (all manufactured by Shin-Etsu Chemical Co., Ltd.), TSF400, TSF401, TSF410, TSF4300, TSF4440, TSF4445, TSF-4446, TSF4452, TSF4460 (all of which are Momentive Performance Materials Japan GK) , Florinert (registered trademark) FC-72, FC-40, FC-43, FC-3283 (all manufactured by Sumitomo 3M Co., Ltd.), Megafuck (registered trademark) R-08 , R-30, R-90, F-410, F-411, F-443, F-445, F-470, F-477, F-479, F-482. , F-483 (all manufactured by DIC Co., Ltd.), Ftop (trade name) EF301, EF303, EF351, EF352 (all manufactured by Mitsubishi Materials Electronics Chemical Co., Ltd.), Surflon (registered) Trademarks) S-381, S-382, S-383, S-393, SC-101, SC-105, KH-40, SA-100 (all manufactured by AGC Seimi Chemical Co., Ltd.) , Product name E1830, E5844 (manufactured by Daikin Fine Chemical Laboratory Co., Ltd.), BM-1000, BM-1100, BYK-352, BYK-353 and BYK-361N (all trade names: manufactured by BM Chemie), etc. Can be mentioned. Of these, polyacrylate-based leveling agents and perfluoroalkyl-based leveling agents are preferable.

The content of the leveling agent in the polymerizable liquid crystal composition is preferably 0.01 to 5 parts by mass, more preferably 0.05 to 3 parts by mass with respect to 100 parts by mass of the polymerizable liquid crystal compound. When the content of the leveling agent is within the above range, it becomes easy to orient the polymerizable liquid crystal compound, and the obtained liquid crystal cured film tends to be smoother, which is preferable. The polymerizable liquid crystal composition may contain two or more kinds of leveling agents.

The polymerizable liquid crystal composition of the present invention is added to the polymerizable liquid crystal compounds (I) and (II) as necessary, such as a solvent, a photopolymerization initiator, a polymerization inhibitor, a photosensitizer or a leveling agent. Can be prepared by adding and stirring and mixing at a predetermined temperature.

<Phase difference film>
Since the polymerizable liquid crystal composition of the present invention has high solubility in the solvent of the polymerizable liquid crystal compound, the occurrence of orientation defects due to precipitation, precipitation, etc. of the undissolved polymerizable liquid crystal compound or the polymerizable liquid crystal compound during storage. Excellent effect of suppressing. Therefore, by using the polymerizable liquid crystal composition of the present invention, it is possible to form a film without deteriorating the optical characteristics that the polymerizable liquid crystal compound can originally develop, and the liquid crystal cured film having excellent optical characteristics can be formed. Is easy to obtain. Therefore, the present invention is a cured product of the polymerizable liquid crystal composition of the present invention, and is a retardation film containing a liquid crystal cured film obtained by curing the polymerizable liquid crystal compound in the polymerizable liquid crystal composition in an oriented state. Also related to. The retardation film composed of the liquid crystal cured film can sufficiently exhibit the optical characteristics that the polymerizable liquid crystal compound used can originally exhibit, and can be a retardation film having high optical performance.

The liquid crystal cured film constituting the retardation film of the present invention may be composed of a homopolymer of the polymerizable liquid crystal compound (I) in an oriented state and a homopolymer of the polymerizable liquid crystal compound (II), or may be polymerized. It may be composed of a copolymer in an oriented state of a mixture of the sex liquid crystal compounds (I) and (II). Since the polymerization reaction is easy and a uniform liquid crystal cured film can be easily obtained, the liquid crystal cured film constituting the retardation film of the present invention is coexisting in the orientation state of the mixture of the polymerizable liquid crystal compounds (I) and (II). It is preferably composed of a polymer.

In one aspect of the present invention, the retardation film of the present invention is a cured product of the polymerizable liquid crystal composition of the present invention, and has optical properties represented by the following formulas (1), (2) and (3). Contains a liquid crystal cured film. The liquid crystal cured film is usually a cured product obtained by curing the polymerizable liquid crystal compounds (I) and (II) in a state of being horizontally oriented with respect to the plane of the liquid crystal cured film (hereinafter, "horizontally oriented liquid crystal cured film"). Also called).
Re (450) / Re (550) ≤ 1.00 (1)
1.00 ≤ Re (650) / Re (550) (2)
100 nm ≤ Re (550) ≤ 180 nm (3)
[In the formula, Re (λ) represents the in-plane retardation value of the cured liquid crystal film at a wavelength of λ nm, and Re = (nx (λ) −ny (λ)) × d (d is the thickness of the cured liquid crystal film). Nx represents the main refractive index at a wavelength of λ nm in the direction parallel to the plane of the cured liquid crystal film in the refractive elliptical body formed by the cured liquid crystal film, and ny represents the main refractive index at the wavelength λ nm formed by the cured liquid crystal film. Represents the refractive index at a wavelength of λ nm in a direction parallel to the plane of the liquid crystal cured film and orthogonal to the nx direction). ]

When the horizontally oriented liquid crystal cured film satisfies the equations (1) and (2), the in-plane retardation value at a short wavelength of the horizontally oriented liquid crystal cured film is smaller than the in-plane retardation value at a long wavelength. It shows so-called reverse wavelength dispersibility. Re (450) / Re (550) is preferably 0.70 or more, more preferably 0.78 or more, and therefore, because the inverse wavelength dispersibility is improved and the optical characteristics of the retardation film are further improved. It is preferably 0.92 or less, more preferably 0.90 or less, still more preferably 0.87 or less, particularly preferably 0.86 or less, and even more preferably 0.85 or less. Further, Re (650) / Re (550) is preferably 1.00 or more, more preferably 1.01 or more, and further preferably 1.02 or more.

The in-plane retardation value can be adjusted by the thickness d of the horizontally oriented liquid crystal cured film. Since the in-plane retardation value is determined by the above equation Re (λ) = (nx (λ) −ny (λ)) × d, a desired in-plane retardation value (Re (λ): wavelength λ ( In order to obtain the in-plane retardation value of the horizontally oriented liquid crystal cured film at nm), the three-dimensional refractive index and the film thickness d may be adjusted.

When the horizontally oriented liquid crystal cured film satisfies the formula (3), the retardation film containing the horizontally oriented liquid crystal cured film functions as a λ / 4 plate, and an elliptical polarizing plate including the retardation film containing the liquid crystal cured film. Is excellent in the effect of improving the front reflection hue (the effect of suppressing coloring) when the above is applied to an optical display or the like. A more preferable range of the in-plane retardation value is 120 nm ≦ Re (550) ≦ 170 nm, and a more preferable range is 130 nm ≦ Re (550) ≦ 150 nm.

In another aspect of the present invention, the retardation film of the present invention is a cured product of the polymerizable liquid crystal composition of the present invention, and has optical properties represented by the following formulas (4), (5) and (6). Includes a liquid crystal cured film having. The liquid crystal cured film is usually a cured product obtained by curing the polymerizable liquid crystal compounds (I) and (II) in a state of being oriented in a direction perpendicular to the plane of the liquid crystal cured film (hereinafter, "vertically oriented liquid crystal cured film"). Also called).
Rth (450) / Rth (550) ≤ 1.00 (4)
1.00 ≤ Rth (650) / Rth (550) (5)
-100nm ≤ Rth (550) ≤ -40nm (6)
[In the formula, Rth (λ) represents the phase difference value in the thickness direction of the cured liquid crystal film at the wavelength λ nm, and Rth = ((nx (λ) + ny (λ)) / 2-nz) × d (d is). Nx represents the thickness of the cured liquid crystal film, nx represents the main refractive index at the wavelength λ nm in the direction parallel to the plane of the cured liquid crystal film in the refractive index ellipse formed by the cured liquid crystal film, and ny represents the cured liquid crystal film. The refractive index of the elliptical body is parallel to the plane of the cured liquid crystal film and represents the refractive index at the wavelength λ nm in the direction orthogonal to the direction of nx, where nz is the refraction formed by the cured liquid crystal film. In the rate elliptical body, it represents the refractive index at the wavelength λ nm in the direction perpendicular to the plane of the liquid crystal cured film). ]

When the vertically oriented liquid crystal cured film satisfies the formulas (4) and (5), the decrease in ellipticity can be suppressed on the short wavelength side in the elliptical polarizing plate including the retardation film containing the vertically oriented liquid crystal cured film. , The oblique reflection hue can be improved. The value of Rth (450) / Rth (550) in the vertically oriented liquid crystal cured film is preferably 0.70 or more, more preferably 0.78 or more, and preferably 0.92 or less, more preferably 0. It is 90 or less, more preferably 0.87 or less, particularly preferably 0.86 or less, and even more preferably 0.85 or less. Further, Rth (650) / Rth (550) is preferably 1.0 or more, more preferably 1.01 or more, and further preferably 1.02 or more.

Further, when the vertically oriented liquid crystal cured film satisfies the formula (6), the oblique reflection hue when an elliptical polarizing plate including a retardation film including the vertically oriented liquid crystal cured film is applied to an organic EL display device is to be improved. Can be done. The retardation value Rth (550) in the film thickness direction of the vertically oriented liquid crystal cured film is more preferably −90 nm or more, further preferably −80 nm or more, and more preferably −50 nm or less.

The phase difference value in the thickness direction can be adjusted by the thickness d of the liquid crystal cured film. Since the phase difference value is determined by the above equation Rth = ((nx (λ) + ny (λ)) / 2-nz) × d, a desired phase difference value (Rth (λ): wavelength λ (nm)) In order to obtain the phase difference value in the thickness direction of the liquid crystal cured film in 1), the three-dimensional refractive index and the film thickness d may be adjusted.

The retardation film of the present invention is, for example,
A step of forming a coating film of the polymerizable liquid crystal composition of the present invention, drying the coating film, and orienting the polymerizable liquid crystal compound in the polymerizable liquid crystal composition, and
It can be produced by a method including a step of polymerizing a polymerizable liquid crystal compound by light irradiation while maintaining an oriented state to form a liquid crystal cured film.

The coating film of the polymerizable liquid crystal composition can be formed by applying the polymerizable liquid crystal composition on a substrate or an alignment film described later.
Examples of the base material include a glass base material and a film base material, and a resin film base material is preferable from the viewpoint of processability. Resins constituting the film substrate include, for example, polyolefins such as polyethylene, polypropylene, and norbornene-based polymers; cyclic olefin-based resins; polyvinyl alcohols; polyethylene terephthalates; polymethacrylic acid esters; polyacrylic acid esters; triacetylcellulose, Examples include diacetyl cellulose and cellulose esters such as cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfone; polyethersulfone; polyether ketones; polyphenylene sulfide and plastics such as polyphenylene oxide. Such a resin can be formed into a film by a known means such as a solvent casting method and a melt extrusion method to form a base material. The surface of the base material may have a protective layer formed of an acrylic resin, a methacrylic resin, an epoxy resin, an oxetane resin, a urethane resin, a melamine resin, or the like. Surface treatment such as plasma treatment may be applied.

A commercially available product may be used as the base material. As commercially available cellulose ester base materials, for example, cellulose ester base materials manufactured by Fuji Photo Film Co., Ltd. such as Fujitac Film; manufactured by Konica Minolta Opto Co., Ltd. such as "KC8UX2M", "KC8UY", and "KC4UY". Cellulose ester base material and the like. Commercially available cyclic olefin resins include, for example, cyclic olefin resins manufactured by Ticona (Germany) such as "Topas (registered trademark)"; cyclic olefins manufactured by JSR Corporation such as "Arton (registered trademark)". Resins; Cyclic olefin resins manufactured by Zeon Corporation such as "ZEONOR (registered trademark)" and "ZEONEX (registered trademark)"; Mitsui such as "Apel" (registered trademark) Cyclic olefin resin manufactured by Kagaku Co., Ltd. can be mentioned. A commercially available cyclic olefin resin base material can also be used. As commercially available cyclic olefin resin base materials, cyclic olefin resin base materials manufactured by Sekisui Chemical Co., Ltd. such as "Scina (registered trademark)" and "SCA40 (registered trademark)"; "Zeonoa film (registered trademark)" A cyclic olefin resin base material manufactured by Optes Corporation; a cyclic olefin resin base material manufactured by JSR Corporation such as "Arton Film (registered trademark)" can be mentioned.

From the viewpoints of thinning the retardation film, easy peeling of the base material, handleability of the base material, and the like, the thickness of the base material is usually 5 to 300 μm, preferably 10 to 150 μm.

Examples of the method for applying the polymerizable liquid crystal composition to a substrate or the like include a spin coating method, an extrusion method, a gravure coating method, a die coating method, a bar coating method, an applicator method and other coating methods, and a flexography method and other printing methods. And the like, a known method can be mentioned.

Then, the solvent is removed by drying or the like to form a dry coating film. Examples of the drying method include a natural drying method, a ventilation drying method, a heat drying method and a vacuum drying method. At this time, by heating the coating film obtained from the polymerizable liquid crystal composition, the solvent is dried and removed from the coating film, and the polymerizable liquid crystal compound is placed in a desired direction (for example, horizontal or vertical) with respect to the coating film plane. Can be oriented in the direction). The heating temperature of the coating film can be appropriately determined in consideration of the polymerizable liquid crystal compound to be used and the material of the base material or the like forming the coating film. , It is necessary that the temperature is equal to or higher than the liquid crystal phase transition temperature. In order to bring the polymerizable liquid crystal compound into a desired orientation state while removing the solvent contained in the polymerizable liquid crystal composition, for example, the liquid crystal phase transition temperature (smetic phase) of the polymerizable liquid crystal compound contained in the polymerizable liquid crystal composition. It can be heated to a temperature of about (transition temperature or nematic phase transition temperature) or higher. The liquid crystal phase transition temperature can be measured using, for example, a polarizing microscope equipped with a temperature control stage, a differential scanning calorimeter (DSC), a thermal weight differential thermal analyzer (TG-DTA), or the like. The phase transition temperature in the polymerizable liquid crystal composition of the present invention containing at least the polymerizable liquid crystal compound (I) and the polymerizable liquid crystal compound (II) is such that the fully polymerizable liquid crystal compound constituting the polymerizable liquid crystal composition is polymerizable. It means the temperature measured using a mixture of polymerizable liquid crystal compounds mixed in the same ratio as the composition in the liquid crystal composition.

The polymerizable liquid crystal composition of the present invention contains at least two types of polymerizable liquid crystal compounds (I) and (II), and usually, each of the single polymerizable liquid crystal compounds (I) or (II) is transferred to the liquid crystal phase. The liquid crystal phase transition can be performed at a temperature lower than the transition temperature. Therefore, in the production of the retardation film using the polymerizable liquid crystal composition of the present invention, excessive consumption of heat energy can be suppressed and production efficiency can be improved. Further, since the liquid crystal phase transition can be performed by heating at a relatively low temperature, there is an advantage that the options of the supporting base material to which the polymerizable liquid crystal composition is applied are expanded.

The heating time can be appropriately determined depending on the heating temperature, the type of the polymerizable liquid crystal compound used, the type of the solvent, its boiling point and its amount, etc., but is usually 15 seconds to 10 minutes, preferably 0.5 to 0.5 minutes. 5 minutes.

The removal of the solvent from the coating film may be performed at the same time as heating the polymerizable liquid crystal compound to the liquid crystal phase transition temperature or higher, or may be performed separately, but it is preferable to perform the removal at the same time from the viewpoint of improving productivity. Before heating the polymerizable liquid crystal compound to a temperature equal to or higher than the liquid crystal phase transition temperature, the solvent in the coating film should be appropriately added under the condition that the polymerizable liquid crystal compound contained in the coating film obtained from the polymerizable liquid crystal composition does not polymerize. A pre-drying step may be provided for removal. Examples of the drying method in the pre-drying step include a natural drying method, a ventilation drying method, a heat drying method and a vacuum drying method, and the drying temperature (heating temperature) in the drying step is the type of polymerizable liquid crystal compound used and the solvent. It can be appropriately determined according to the type of the product, its boiling point, its amount, and the like.

Next, in the obtained dry coating film, the polymerizable liquid crystal compound is polymerized by light irradiation while maintaining the orientation state of the polymerizable liquid crystal compound, whereby the polymer of the polymerizable liquid crystal compound existing in the desired orientation state is used. A certain liquid crystal cured film is formed. Since the polymerizable liquid crystal composition of the present invention can be highly polymerized by irradiation with light such as high-intensity ultraviolet rays while suppressing damage to the polymerizable liquid crystal compound, the polymerization method is usually a photopolymerization method. Is used. In photopolymerization, the light to be applied to the dry coating film is appropriately selected according to the type of the polymerization initiator contained in the dry coating film, the type of the polymerizable liquid crystal compound, and the amount thereof. Specific examples thereof include one or more types of light and active electron beams selected from the group consisting of visible light, ultraviolet light, infrared light, X-rays, α-rays, β-rays and γ-rays. Among them, ultraviolet light is preferable because it is easy to control the progress of the polymerization reaction and it is possible to use a photopolymerization apparatus widely used in the art. It is preferable to select the type of the polymerizable liquid crystal compound and the polymerization initiator contained in the polymerizable liquid crystal composition. Further, at the time of polymerization, the polymerization temperature can be controlled by irradiating light while cooling the dry coating film by an appropriate cooling means. By adopting such a cooling means, if the polymerizable liquid crystal compound is polymerized at a lower temperature, a liquid crystal cured film can be appropriately formed even if a base material having a relatively low heat resistance is used. It is also possible to promote the polymerization reaction by raising the polymerization temperature within a range in which defects due to heat during light irradiation (deformation due to heat of the base material, etc.) do not occur. A patterned cured film can also be obtained by masking or developing during photopolymerization.

Examples of the light source of the active energy ray include a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a xenon lamp, a halogen lamp, a carbon arc lamp, a tungsten lamp, a gallium lamp, an excima laser, and a wavelength range. Examples thereof include an LED light source that emits 380 to 440 nm, a chemical lamp, a black light lamp, a microwave-excited mercury lamp, and a metal halide lamp.

The ultraviolet irradiation intensity is usually 10 to 3,000 mW / cm ² . The ultraviolet irradiation intensity is preferably an intensity in a wavelength region effective for activating the photopolymerization initiator. The time for irradiating light is usually 0.1 seconds to 10 minutes, preferably 0.1 seconds to 5 minutes, more preferably 0.1 seconds to 3 minutes, still more preferably 0.1 seconds to 1 minute. be. When irradiated once or multiple times with such an ultraviolet irradiation intensity, the integrated light intensity is 10 to 3,000 mJ / cm ² , preferably 50 to 2,000 mJ / cm ² , and more preferably 100 to 1,000 mJ / cm. It is ^2.

The thickness of the liquid crystal cured film can be appropriately selected depending on the optical display to be applied and the like. It is preferably 0.2 to 3 μm, more preferably 0.2 to 2 μm.

The coating film of the polymerizable liquid crystal composition may be formed on the alignment film. The alignment film has an orientation-regulating force that aligns the polymerizable liquid crystal compound in a desired direction. For example, there are a horizontal alignment film having an orientation restricting force for orienting a polymerizable liquid crystal compound in the horizontal direction, a vertical alignment film having an orientation restricting force for orienting a polymerizable liquid crystal compound in the vertical direction, and the like. The orientation regulating force can be arbitrarily adjusted according to the type of alignment film, surface condition, rubbing conditions, etc., and when the alignment film is formed of a photo-alignable polymer, it can be arbitrarily adjusted according to polarization irradiation conditions, etc. It is possible to do.

The alignment film preferably has solvent resistance that does not dissolve when the polymerizable liquid crystal composition is applied, and also has heat resistance in heat treatment for removing the solvent and aligning the polymerizable liquid crystal compound described later. Examples of the alignment film include an alignment film containing an orientation polymer, a photoalignment film, a grub alignment film having an uneven pattern or a plurality of grooves on the surface, a stretched film stretched in the orientation direction, and the like, and the accuracy of the orientation angle and From the viewpoint of quality, a photoalignment film is preferable.

Examples of the oriented polymer include polyamides and gelatins having an amide bond in the molecule, polyimide having an imide bond in the molecule and polyamic acid, which is a hydrolyzate thereof, polyvinyl alcohol, alkyl-modified polyvinyl alcohol, polyacrylamide, and poly. Examples thereof include oxazole, polyethyleneimine, polystyrene, polyvinylpyrrolidone, polyacrylic acid and polyacrylic acid esters. Of these, polyvinyl alcohol is preferable. The oriented polymer can be used alone or in combination of two or more.

The alignment film containing the orientation polymer is usually obtained by applying a composition in which the orientation polymer is dissolved in a solvent (hereinafter, also referred to as “orientation polymer composition”) to a base material to remove the solvent or orientation. It is obtained by applying the polymer composition to a substrate, removing the solvent, and rubbing (rubbing method). Examples of the solvent include the same solvents as those exemplified above as the solvents that can be used in the polymerizable liquid crystal composition.

The concentration of the oriented polymer in the oriented polymer composition may be within the range in which the oriented polymer material can be completely dissolved in the solvent, but is preferably 0.1 to 20% in terms of solid content with respect to the solution, and is 0. .1 to 10% is more preferable.

As the orientation polymer composition, a commercially available alignment film material may be used as it is. Examples of commercially available alignment film materials include Sunever (registered trademark, manufactured by Nissan Chemical Industries, Ltd.) and Optomer (registered trademark, manufactured by JSR Corporation).

Examples of the method of applying the oriented polymer composition to the base material include the same methods as those exemplified as the method of applying the polymerizable liquid crystal composition to the base material.

Examples of the method for removing the solvent contained in the oriented polymer composition include a natural drying method, a ventilation drying method, a heat drying method and a vacuum drying method.

In order to impart an orientation regulating force to the alignment film, a rubbing treatment can be performed as needed (rubbing method). As a method of imparting orientation-regulating force by the rubbing method, a rubbing cloth is wrapped around a rotating rubbing roll, and an orientation polymer composition is applied to the substrate and annealed to form the surface of the substrate. Examples thereof include a method in which a film of an oriented polymer is brought into contact with each other. If masking is performed during the rubbing treatment, a plurality of regions (patterns) having different orientation directions can be formed on the alignment film.

The photoalignment film is usually formed by applying a composition containing a polymer or monomer having a photoreactive group and a solvent (hereinafter, also referred to as “composition for forming a photoalignment film”) to a base material, removing the solvent, and then polarized light. It is obtained by irradiating (preferably polarized UV). The photoalignment film is also advantageous in that the direction of the orientation regulating force can be arbitrarily controlled by selecting the polarization direction of the polarized light to be irradiated.

A photoreactive group is a group that produces a liquid crystal alignment ability when irradiated with light. Specific examples thereof include groups involved in photoreactions that are the origin of liquid crystal orientation ability such as molecular orientation induction or isomerization reaction, dimerization reaction, photocrosslinking reaction or photodecomposition reaction generated by light irradiation. Of these, groups involved in the dimerization reaction or photocrosslinking reaction are preferable because they are excellent in orientation. As the photoreactive group, an unsaturated bond, particularly a group having a double bond is preferable, and a carbon-carbon double bond (C = C bond), a carbon-nitrogen double bond (C = N bond), and a nitrogen-nitrogen double bond are preferable. A group having at least one selected from the group consisting of a double bond (N = N bond) and a carbon-oxygen double bond (C = O bond) is particularly preferable.

Examples of the photoreactive group having a C = C bond include a vinyl group, a polyene group, a stilbene group, a stillbazole group, a stillvazolium group, a chalcone group, a cinnamoyl group and the like. Examples of the photoreactive group having a C = N bond include a group having a structure such as an aromatic Schiff base and an aromatic hydrazone. Examples of the photoreactive group having an N = N bond include an azobenzene group, an azonaphthalene group, an aromatic heterocyclic azo group, a bisazo group, a formazan group, and a group having an azoxybenzene structure. Examples of the photoreactive group having a C = O bond include a benzophenone group, a coumarin group, an anthraquinone group, a maleimide group and the like. These groups may have substituents such as an alkyl group, an alkoxy group, an aryl group, an allyloxy group, a cyano group, an alkoxycarbonyl group, a hydroxyl group, a sulfonic acid group and an alkyl halide group.

Among them, a photoreactive group involved in a photodimerization reaction is preferable, and a photoalignment film having a relatively small amount of polarized light required for photoalignment and excellent thermal stability and stability over time can be easily obtained. A cinnamoyl group and a chalcone group are preferable. As the polymer having a photoreactive group, a polymer having a cinnamoyl group such that the terminal portion of the side chain of the polymer has a cinnamic acid structure is particularly preferable.

By applying the composition for forming a photoalignment film onto a base material, a photoalignment-inducing layer can be formed on the base material. Examples of the solvent contained in the composition include the same solvents as those exemplified above as the solvents that can be used in the polymerizable liquid crystal composition, and are appropriately selected depending on the solubility of the polymer having a photoreactive group or the monomer. can do.

The content of the polymer or monomer having a photoreactive group in the composition for forming a photo-alignment film can be appropriately adjusted depending on the type of the polymer or monomer and the thickness of the target photo-alignment film, but the composition for forming a photo-alignment film. It is preferably at least 0.2% by mass, and more preferably in the range of 0.3 to 10% by mass. The composition for forming a photoalignment film may contain a polymer material such as polyvinyl alcohol or polyimide or a photosensitizer as long as the characteristics of the photoalignment film are not significantly impaired.

Examples of the method of applying the composition for forming a photoalignment film to the base material include the same method as the method of applying the orientation polymer composition to the base material. Examples of the method for removing the solvent from the applied composition for forming a photoalignment film include a natural drying method, a ventilation drying method, a heat drying method and a vacuum drying method.

In order to irradiate polarized light, even in the form of directly irradiating polarized UV from the composition for forming a photoalignment film coated on the base material, the polarized light is irradiated from the base material side to obtain polarized light. It may be in the form of transmitting and irradiating. Further, it is particularly preferable that the polarized light is substantially parallel light. The wavelength of the polarized light to be irradiated is preferably in the wavelength range in which the photoreactive group of the polymer or monomer having a photoreactive group can absorb light energy. Specifically, UV (ultraviolet rays) having a wavelength in the range of 250 to 400 nm is particularly preferable. Examples of the light source used for the polarized light irradiation include xenon lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, metal halide lamps, ultraviolet light lasers such as KrF and ArF, and high-pressure mercury lamps, ultra-high pressure mercury lamps and metal halide lamps. preferable. Among these, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, and a metal halide lamp are preferable because they have a high emission intensity of ultraviolet rays having a wavelength of 313 nm. Polarized UV can be irradiated by irradiating the light from the light source through an appropriate polarizer. As such a polarizing element, a polarizing filter, a polarizing prism such as Gran Thomson or Gran Tailor, or a wire grid type polarizing element can be used.

If masking is performed during rubbing or polarized light irradiation, it is possible to form a plurality of regions (patterns) in which the directions of liquid crystal orientation are different.

A groove alignment film is a film having an uneven pattern or a plurality of grooves on the surface of the film. When the polymerizable liquid crystal compound is applied to a film having a plurality of linear grubs arranged at equal intervals, the liquid crystal molecules are oriented in the direction along the groove.

As a method of obtaining a grub alignment film, a method of forming an uneven pattern by developing and rinsing after exposure through an exposure mask having a pattern-shaped slit on the surface of a photosensitive polyimide film, or a plate having a groove on the surface. A method of forming a layer of UV-curable resin before curing on a shaped master, transferring the formed resin layer to a substrate and then curing, and a film of UV-curable resin before curing formed on the substrate. Examples thereof include a method in which a roll-shaped master having a plurality of grooves is pressed to form irregularities and then cured.

The thickness of the alignment film (alignment film containing an alignment polymer or photoalignment film) is usually in the range of 10 to 10000 nm, preferably in the range of 10 to 1000 nm, more preferably 10 to 500 nm or less, and further preferably. Is in the range of 10 to 300 nm, particularly preferably 50 to 250 nm.

<Elliptical polarizing plate>
The present invention includes an elliptical polarizing plate including the retardation film and the polarizing film of the present invention.
The polarizing film is a film having a polarizing function, and examples thereof include a stretched film having a dye having an absorption anisotropy adsorbed and a film containing a film coated with a dye having an absorption anisotropy as a polarizer. Examples of the dye having absorption anisotropy include a dichroic dye.

A film containing a stretched film having a dye having absorption anisotropy adsorbed as a polarizer is usually obtained by uniaxially stretching a polyvinyl alcohol-based resin film and dyeing the polyvinyl alcohol-based resin film with a bicolor dye. At least of the polarizer produced through a step of adsorbing a bicolor dye, a step of treating a polyvinyl alcohol-based resin film on which the bicolor dye is adsorbed with an aqueous boric acid solution, and a step of washing with water after the treatment with the aqueous boric acid solution. It is produced by sandwiching one surface with a transparent protective film via an adhesive.

The polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.

The saponification degree of the polyvinyl alcohol-based resin is usually about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes can also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably in the range of 1,500 to 5,000.

A film formed of such a polyvinyl alcohol-based resin is used as a raw film for a polarizing film. The method for forming the film of the polyvinyl alcohol-based resin is not particularly limited, and the film can be formed by a known method. The film thickness of the polyvinyl alcohol-based raw film can be, for example, about 10 to 150 μm.

The uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before dyeing with a dichroic dye, at the same time as dyeing, or after dyeing. When the uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before the boric acid treatment or during the boric acid treatment. It is also possible to perform uniaxial stretching at these multiple stages. In uniaxial stretching, rolls having different peripheral speeds may be uniaxially stretched, or thermal rolls may be used to uniaxially stretch the rolls. Further, the uniaxial stretching may be a dry stretching in which the stretching is performed in the atmosphere, or a wet stretching in which the polyvinyl alcohol-based resin film is swollen using a solvent. The draw ratio is usually about 3 to 8 times.

Dyeing of the polyvinyl alcohol-based resin film with a dichroic dye is performed, for example, by immersing the polyvinyl alcohol-based resin film in an aqueous solution containing the dichroic dye.

Specifically, as the dichroic dye, iodine or a dichroic organic dye is used. Examples of the dichroic organic dye include C.I. I. Examples thereof include a dichroic direct dye composed of a disazo compound such as DIRECT RED 39, and a dichroic direct dye composed of a compound such as trisazo and tetrakisazo. The polyvinyl alcohol-based resin film is preferably immersed in water before the dyeing treatment.

When iodine is used as the dichroic dye, a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide for dyeing is usually adopted. The iodine content in this aqueous solution is usually about 0.01 to 1 part by mass per 100 parts by mass of water. The content of potassium iodide is usually about 0.5 to 20 parts by mass per 100 parts by mass of water. The temperature of the aqueous solution used for dyeing is usually about 20 to 40 ° C. The immersion time (staining time) in this aqueous solution is usually about 20 to 1,800 seconds.

On the other hand, when a dichroic organic dye is used as the dichroic dye, a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing a water-soluble dichroic dye and dyeing is usually adopted. The content of the dichroic organic dye in this aqueous solution is usually ^{about 1 × 10 -4} to 10 parts by mass, preferably 1 × 10 ^-3 to 1 part by mass, more preferably 1 × 10 -4 to 1 part by mass, per 100 parts by mass of water. Is 1 × 10 ^-3 to 1 × ^10-2 parts by mass. This aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing aid. The temperature of the dichroic dye aqueous solution used for dyeing is usually about 20 to 80 ° C. The immersion time (staining time) in this aqueous solution is usually about 10 to 1,800 seconds.

The boric acid treatment after dyeing with a dichroic dye can usually be carried out by immersing the dyed polyvinyl alcohol-based resin film in an aqueous boric acid solution. The content of boric acid in this aqueous boric acid solution is usually about 2 to 15 parts by mass, preferably 5 to 12 parts by mass, per 100 parts by mass of water. When iodine is used as the dichroic dye, this aqueous boric acid solution preferably contains potassium iodide, and the content of potassium iodide in that case is usually 0.1 to 1 parts by mass per 100 parts by mass of water. It is about 15 parts by mass, preferably 5 to 12 parts by mass. The immersion time in the boric acid aqueous solution is usually about 60 to 1,200 seconds, preferably 150 to 600 seconds, and more preferably 200 to 400 seconds. The temperature of the boric acid treatment is usually 50 ° C. or higher, preferably 50 to 85 ° C., and more preferably 60 to 80 ° C.

The polyvinyl alcohol-based resin film after the boric acid treatment is usually washed with water. The water washing treatment can be performed, for example, by immersing the boric acid-treated polyvinyl alcohol-based resin film in water. The temperature of water in the water washing treatment is usually about 5 to 40 ° C. The immersion time is usually about 1 to 120 seconds.

After washing with water, a drying treatment is performed to obtain a polarizer. The drying process can be performed using, for example, a hot air dryer or a far-infrared heater. The temperature of the drying treatment is usually about 30 to 100 ° C, preferably 50 to 80 ° C. The drying treatment time is usually about 60 to 600 seconds, preferably 120 to 600 seconds. By the drying treatment, the moisture content of the polarizer is reduced to a practical level. The water content is usually about 5 to 20% by mass, preferably 8 to 15% by mass. When the water content is in the above range, it is easy to obtain a polarizer having appropriate flexibility and excellent thermal stability.

The thickness of the polarizer obtained by uniaxially stretching, dyeing with a dichroic dye, boric acid treatment, washing with water and drying on the above-mentioned polyvinyl alcohol-based resin film is preferably 5 to 40 μm.

Examples of the film coated with the dye having absorption anisotropy include a composition containing a dichroic dye having liquid crystallinity, a film obtained by applying a composition containing a dichroic dye and a polymerizable liquid crystal compound, and the like. Can be mentioned. The film preferably has a protective film on one or both sides thereof. Examples of the protective film include the same as the resin film exemplified above as a base material that can be used for producing a liquid crystal cured film.

The film coated with the dye having absorption anisotropy is preferably thin, but from the viewpoint of strength and processability, the thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0. It is 5 to 3 μm.

Specific examples of the film coated with the dye having absorption anisotropy include the films described in JP-A-2013-33249.

A polarizing film can be obtained by laminating a transparent protective film on at least one surface of the polarizing element thus obtained via an adhesive. As the transparent protective film, a transparent film similar to the resin film exemplified above can be preferably used as a base material that can be used for producing a liquid crystal cured film constituting a retardation film.

The elliptical polarizing plate of the present invention is configured to include the retardation film and the polarizing film of the present invention. For example, the retardation film and the polarizing film of the present invention are combined with an adhesive layer or an adhesive layer. The elliptical polarizing plate of the present invention can be obtained by laminating through the polarizing plate.

In one aspect of the present invention, when the retardation film of the present invention including the liquid crystal cured film and the polarizing film are laminated, the slow axis (optical axis) of the liquid crystal cured film constituting the retardation film and the polarizing film It is preferable to stack the films so that the angle formed by the absorption shaft is 45 ± 5 °.

The elliptical polarizing plate of the present invention may have a configuration provided by a conventional general elliptical polarizing plate, or a polarizing film and a retardation film. Such a configuration includes, for example, an adhesive layer (sheet) for bonding an elliptical polarizing plate to a display element or the like constituting an optical display, and an object for protecting the surface of a polarizing film or a retardation film from scratches and stains. Protective film and the like used in.

The elliptical polarizing plate of the present invention can be used in various display devices.
The display device is a device having a display element, and includes a light emitting element or a light emitting device as a light emitting source. The display devices include a liquid crystal display device, an organic electroluminescence (EL) display device, an inorganic electroluminescence (EL) display device, a flexible image display device, a touch panel display device, an electron emission display device (for example, an electric field emission display device (FED)). Surface electric field emission display device (SED)), electronic paper (display device using electronic ink or electrophoretic element, plasma display device, projection type display device (for example, grating light valve (GLV) display device, digital micromirror device (DMD)) ), A piezoelectric ceramic display, and the like. The liquid crystal display device includes a transmissive liquid crystal display device, a transflective liquid crystal display device, a reflective liquid crystal display device, a direct-view type liquid crystal display device, and a projection type liquid crystal display device. These display devices may be display devices that display two-dimensional images, or three-dimensional display devices that display three-dimensional images. In particular, the elliptical polarizing plate of the present invention. Can be suitably used for an organic electroluminescence (EL) display device and an inorganic electroluminescence (EL) display device. These display devices (optical displays) are provided with the elliptical polarizing plate of the present invention having excellent optical characteristics. , Good image display characteristics can be exhibited.

The flexible image display device having the elliptical polarizing plate of the present invention preferably further has a window and a touch panel touch sensor.
The flexible image display device is composed of, for example, a laminated body for a flexible image display device and an organic EL display panel, and the laminated body for the flexible image display device is arranged on the visual side with respect to the organic EL display panel and is configured to be bendable. Has been done. The laminated body for a flexible image display device may include a window, a touch panel touch sensor, and the like in addition to the elliptical polarizing plate of the present invention described above. The stacking order thereof is arbitrary, but it is preferable that they are stacked in the order of the window, the elliptical polarizing plate, and the touch panel touch sensor, or in the order of the window, the touch panel touch sensor, and the elliptical polarizing plate from the visual side.

The presence of an elliptical polarizing plate on the visual side of the touch panel touch sensor is preferable because the pattern of the touch panel touch sensor is less likely to be visually recognized and the visibility of the displayed image is improved. Each member can be laminated using an adhesive, an adhesive, or the like. Further, the laminated body for a flexible image display device can be provided with a light-shielding pattern formed on at least one surface of any one of the windows, the elliptical polarizing plate, and the touch panel touch sensor.

The window is arranged on the visual side of the flexible image display device, and plays a role of protecting other components from external impacts or environmental changes such as temperature and humidity. Conventionally, glass has been used as such a protective layer, but a window in a flexible image display device is not rigid and hard like glass, but has flexible characteristics. The window is made of a flexible transparent substrate and may include a hard coat layer on at least one surface.

The window, touch panel touch sensor, and the like constituting the laminated body for the flexible image display device are not particularly limited, and conventionally known ones can be adopted.

Hereinafter, the present invention will be described in more detail with reference to Examples. Unless otherwise specified, "%" and "part" in the example mean mass% and parts by mass, respectively.

[Example 1: Production of polymerizable liquid crystal compound (A-1)]
A polymerizable liquid crystal compound represented by the following formula (A-1) (hereinafter referred to as “polymerizable liquid crystal compound (A-1)”) was synthesized according to the following scheme.

1.00 part of the compound represented by the formula (D-1) synthesized with reference to Patent Document (Japanese Patent Laid-Open No. 2010-024438) with a nitrogen atmosphere in a 100 mL-four-necked flask equipped with a Dimroth condenser and a thermometer. , 1.05 parts of the compound represented by the formula (E-1), 0.02 part of dimethylaminopyridine (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.), dibutylhydroxytoluene (Fuji Film Wako Pure Chemical Industries, Ltd.) 0.2 parts (manufactured by Wako Pure Chemical Industries, Ltd.) and 30 parts of chloroform (manufactured by Kanto Chemical Industries, Ltd.) are added and mixed, and then 1.92 g of IPC (manufactured by Wako Pure Chemical Industries, Ltd.) is further added using a dropping funnel. , These were reacted at 0 ° C. overnight. After completion of the reaction, insoluble components were removed by filtration. The obtained chloroform solution was added dropwise to methanol (manufactured by Wako Pure Chemical Industries, Ltd.) having a weight three times the weight of chloroform contained in the solution to precipitate a solid. Subsequently, the precipitated solid was taken out by filtration, washed with 20 g of methanol three times, and then dried under reduced pressure at 40 ° C. to obtain 7.49 g of the polymerizable liquid crystal compound (A-1). The yield of the polymerizable liquid crystal compound (A-1) was 38% based on the compound (E-1).

[Example 2: Production of polymerizable liquid crystal compound (A-2)]
It is represented by the formula (A-2) in the same manner as in Example 1 except that the compound represented by the formula (D-2) shown below is used instead of the compound represented by the formula (D-1). A polymerizable liquid crystal compound (hereinafter referred to as “polymerizable liquid crystal compound (A-2)”) was produced.

[Example 3: Production of polymerizable liquid crystal compound (A-3)]
The polymerizable property represented by the formula (A-3) is the same as in Example 1 except that the compound represented by the formula (D-4) is used instead of the compound represented by the formula (D-1). A liquid crystal compound (hereinafter referred to as "polymerizable liquid crystal compound (A-3)") was produced.

[Comparative Example 1]
Instead of using the compound represented by the formula (E-1), 1.00 parts of the compound represented by the formula (F-1) and 1.90 parts of the compound represented by the formula (D-1) were used. A polymerizable liquid crystal compound represented by the formula (A-4) (hereinafter referred to as “polymerizable liquid crystal compound (A-4)”) was synthesized in the same manner as in Example 1 except for the above.

[Comparative Example 2]
Instead of using the compound represented by the formula (E-1), 1.00 parts of the compound represented by the formula (F-1) and 1.90 parts of the compound represented by the formula (D-2) were used. A polymerizable liquid crystal compound represented by the formula (A-5) (hereinafter referred to as “polymerizable liquid crystal compound (A-5)”) was synthesized in the same manner as in Example 1 except for the above.

[Comparative Example 3]
Instead of using the compound represented by the formula (E-1), 1.00 parts of the compound represented by the formula (F-1) and 1.90 parts of the compound represented by the formula (D-3) were used. A polymerizable liquid crystal compound represented by the formula (A-6) (hereinafter referred to as “polymerizable liquid crystal compound (A-6)”) was synthesized in the same manner as in Example 1 except for the above.

[Comparative Example 4]
Instead of using the compound represented by the formula (E-1), 1.00 parts of the compound represented by the formula (F-1) and 1.90 parts of the compound represented by the formula (D-4) were used. A polymerizable liquid crystal compound represented by the formula (A-7) (hereinafter referred to as “polymerizable liquid crystal compound (A-7)”) was synthesized in the same manner as in Example 1 except for the above.

[Measurement of solubility]
Put 1 g each of two organic solvents (o-xylene and cyclopentanone) and a stirrer in a vial tube at 25 ° C., and stir with a magnetic stirrer (HS-30DN, AS ONE) while stirring the polymerizable property of Example 1. The liquid crystal compound (A-1) was added until undissolved residue was visually confirmed. Further, after stirring for 2 hours from the time when the undissolved residue was confirmed, the solubility of the obtained mixed solution was measured by confirming that there was an undissolved residue and then analyzing the supernatant concentration by HPLC (). Analyzer: HPLC (Shimadzu), column used: L-Liquid ODS 3 μm (3 mm × 150 mm), mobile phase A: 0.1% (v / v) -trifluoroacetic acid / water, mobile phase B: 0.1 % (V / v) -trifluoroacetic acid / acetonitrile, injection volume: 5 μL, detection wavelength: 220 nm, oven temperature: 40 ° C., flow rate: 0.5 mL / min). The solubility of the polymerizable liquid crystal compounds of Examples 2 and 3 and Comparative Examples 1 to 4 in each organic solvent was measured in the same manner. The results obtained are shown in Table 1.

The polymerizable liquid crystal compounds according to the present invention (Examples 1 to 3) are the same as the polymerizable liquid crystal compounds of Comparative Examples 1 to 4 having a symmetrical structure centered on the alicyclic hydrocarbon group corresponding to M in the formula (I). It was confirmed that the solubility could be improved in comparison.

（数平均分子量 約２９０００）
溶剤：プロピレングリコールモノメチルエーテル：９９部 [Preparation of composition for forming a photoalignment film]
The following components were mixed, and the obtained mixture was stirred at 80 ° C. for 1 hour to obtain a photoalignment film forming composition (1).
Polymer with photoreactive groups: 1 part

(Number average molecular weight about 29000)
Solvent: Propylene glycol monomethyl ether: 99 parts

[Preparation of composition (1) for forming a liquid crystal cured film]
The following components were mixed, and the obtained mixture was stirred at 80 ° C. for 1 hour to obtain a liquid crystal cured film forming composition (1).
The following polymerizable liquid crystal compound (B-1) was synthesized by the method described in JP-A-2010-31223.

実施例１の重合性液晶化合物（Ａ−１）：１０部
重合開始剤：
２−ジメチルアミノ−２−ベンジル−１−（４−モルホリノフェニル）ブタン−１−オン（イルガキュア（登録商標）３６９；チバ スペシャルティケミカルズ社製） ２部
レベリング剤：ポリアクリレート化合物（ＢＹＫ−３６１Ｎ；ＢＹＫ−Ｃｈｅｍｉｅ社製） ０．１部
重合禁止剤：ジブチルヒドロキシトルエン（和光純薬工業株式会社製） ０．１部
溶剤：Ｎ−メチル−２−ピロリジノン １６０部、シクロペンタノン ２４０部 Polymerizable liquid crystal compound (B-1): 26 parts

Polymerizable liquid crystal compound (A-1) of Example 1: 10-part polymerization initiator:
2-Dimethylamino-2-benzyl-1- (4-morpholinophenyl) butane-1-one (Irgacure (registered trademark) 369; manufactured by Ciba Specialty Chemicals) Part 2 Leveling agent: Polyacrylate compound (BYK-361N; BYK) -Chemie) 0.1 part Polymerization inhibitor: Dibutylhydroxytoluene (manufactured by Wako Pure Chemical Industries, Ltd.) 0.1 part Solvent: N-methyl-2-pyrrolidinone 160 parts, cyclopentanone 240 parts

[Manufacturing of optical film]
Cycloolefin polymer film (COP) (ZF-14, manufactured by Nippon Zeon Corporation) is applied once with a corona processing device (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) under the conditions of output of 0.3 kW and processing speed of 3 m / min. Processed. The composition for forming a photoalignment film (1) is applied to the corona-treated surface with a bar coater, dried at 80 ° C. for 1 minute, and a polarized UV irradiation device (SPOT CURE SP-7; manufactured by Ushio, Inc.). Therefore, polarized UV exposure was performed with an integrated light amount of 100 mJ / cm ^2. Subsequently, the composition for forming a liquid crystal cured film (1) was applied onto the obtained photoalignment film with a bar coater, dried at 120 ° C. for 1 minute, and then a high-pressure mercury lamp (Unicure (registered trademark) VB-15201BY). An optical film was produced by irradiating ultraviolet rays (in a nitrogen atmosphere, wavelength: 365 nm, integrated light amount at wavelength 365 nm: 1000 mJ / cm ^{2) with −A, manufactured by Ushio Denki Co., Ltd.).}

[Measurement of optical characteristics]
The front phase difference value of the optical film was measured by a measuring machine (KOBRA-WR, manufactured by Oji Measuring Instruments Co., Ltd.). Since the cycloolefin polymer film used as the base material does not have birefringence, the value obtained by measuring the above optical film including the COP film with a measuring machine was substantially produced on the COP film. It is the front phase difference value of the liquid crystal cured film. The obtained optical measurement front retardation values were measured at wavelengths of 450 nm, 550 nm and 650 nm, respectively, and were measured as [Re (450) / Re (550)] (referred to as α) and [Re (650) / Re (550). ] (Let's be β), it was the value shown below.
Re (450) = 125nm
Re (550) = 135 nm
Re (650) = 137 nm
Re (450) / Re (550) = 0.91
Re (650) / Re (550) = 1.01

Since the α of the obtained optical film was 1 or less and the value of β was 1 or more, it was confirmed that the refractive index shows reverse wavelength dispersibility. From this, it can be seen that the optical film formed from the polymerizable liquid crystal composition of the present invention is capable of uniform polarization conversion in a wide wavelength range.

According to the present invention, it is possible to obtain a composition having improved solubility of a polymerizable liquid crystal compound in a solvent. Further, from the composition, an optical film capable of uniform polarization conversion in a wide wavelength range can be produced.

Claims (14)

Equation (I):

[In formula (I),
M represents a divalent alicyclic hydrocarbon group, and the hydrogen atom contained in the divalent alicyclic hydrocarbon group is a halogen atom, an alkyl group having 1 to 4 carbon atoms, and 1 to 4 carbon atoms. It may be substituted with a fluoroalkyl group, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group, and the carbon atom constituting the divalent alicyclic hydrocarbon group is an oxygen atom, a sulfur atom or a nitrogen atom. May be replaced by an atom
B ¹ and B ² are independently alkylene groups having 1 to 4 carbon atoms, -O-, -S-, -R ^a1 OR ^a2- , -R ^a3 COOR ^a4- , -R ^a5 OCOR ^a6 -,-, respectively. R ^a7 OC = OOR ^a8 −, −OR ^b O−, −C (= O) −NR ^c −, −N = N−, −CR ^c = CR ^d − or −C≡C−, where R ^{a1 to} R ^a8 are independently single-bonded or alkylene groups ^{having 1 to 4 carbon atoms, R b} is an alkylene group having 1 to 4 carbon atoms, and R ^c and R ^d are alkyls having 1 to 4 carbon atoms. Represents a group or hydrogen atom
A ¹ and A ² independently represent a divalent alicyclic hydrocarbon group or an aromatic group, and the hydrogen atom contained in the divalent alicyclic hydrocarbon group or an aromatic group is a halogen atom. , The divalent alicyclic hydrocarbon may be substituted with an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group. The carbon atoms that make up the hydrogen or aromatic groups may be substituted with oxygen, sulfur or nitrogen atoms.
L ¹ and L ² independently represent -O-, -COO- or -OCO-, respectively.
E ^a and E ^b each independently represent an alkanediyl group having 1 to 12 carbon atoms, wherein the hydrogen atom contained in the alkanediyl group is replaced with an alkyl group or a halogen atom having 1 to 4 carbon atoms. _{-CH 2-,} which is contained in the alkanediyl group and is not adjacent to ^{L 1} or L ² , may be substituted with -O- or -S- (where E ^a and E a and If there are multiple -O- and / or -S- in ^{Eb, they are not adjacent to each other)}
P is an acryloyloxy group or a methacryloyloxy group,
If the lesser of the total number of carbon atoms in the groups represented by the sum and E ^b of the number of carbon atoms in the groups represented by E ^a N1, the larger amount was N2, N1 is 2-6, N2 is 6 to 12 and satisfies the relationship of 1 <N2-N1 <10]
A polymerizable liquid crystal compound represented by. The polymerizable liquid crystal compound according to claim 1, wherein M is a divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms. A ¹ and A ² each independently represent a divalent aromatic group, and the hydrogen atom contained in the divalent aromatic group is a halogen atom, an alkyl group having 1 to 4 carbon atoms, and 1 to 1 carbon atoms. It may be substituted with a fluoroalkyl group of 4, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group, and the carbon atom constituting the divalent aromatic group is an oxygen atom, a sulfur atom or a nitrogen atom. The polymerizable liquid crystal compound according to claim 1 or 2, which may be substituted with. The polymerizable liquid crystal compound according to any one of claims 1 to 3, wherein B ¹ and B ^{2 are independently -COO- or -OCO-, respectively.} The polymerizable liquid crystal compound according to any one of claims 1 to 4, and the formula (II):

[In formula (II), Ar is a divalent group having at least one aromatic ring, and the aromatic ring constituting the divalent group contains at least one of a nitrogen atom, an oxygen atom and a sulfur atom. The total number of π electrons contained in the aromatic ring constituting Ar, N _π, is 12 or more and less than 36.
G ¹ and G ² each independently represent a divalent alicyclic hydrocarbon group, and the hydrogen atom contained in the alicyclic hydrocarbon group is a halogen atom, an alkyl group having 1 to 4 carbon atoms, and carbon. It may be substituted with a fluoroalkyl group having a number of 1 to 4, an alkoxy group having a carbon number of 1 to 4, a cyano group or a nitro group, and −CH ₂ − contained in the alicyclic hydrocarbon group is −O−. , -S- or -NH-,
B ³ and B ⁴ each independently represent a single bond or a divalent linking group.
A ³ and A ⁴ independently represent a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms or a divalent aromatic hydrocarbon group having 6 to 20 carbon atoms. The hydrogen atom contained in the group and the aromatic hydrocarbon group may be substituted with a halogen atom, an alkyl group having 1 to 4 carbon atoms which may be substituted with a fluorine atom, and 1 to 4 carbon atoms which may be substituted with a fluorine atom. It may be substituted with an alkoxy group, a cyano group or a nitro group of the above, and -CH _2- contained in the alicyclic hydrocarbon group may be replaced with -O-, -S- or -NR ^1-. Often, -CH (-)-contained in the alicyclic hydrocarbon group may be replaced by -N (-)-, where R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
L ^{3 to} L ⁶ independently represent -O-, -COO- or -OCO-, respectively.
E ^c and E ^d each independently represent an alkanediyl group of 1 to 17 carbon atoms, hydrogen atoms contained in the alkanediyl group may be substituted with halogen atoms, contained in the alkanediyl group -CH ₂ -may be replaced by -O- or -CO-.
P ¹ and P ² each independently represent a polymerizable group]
A polymerizable liquid crystal composition containing a polymerizable liquid crystal compound represented by. The polymerizable liquid crystal composition according to claim 5, wherein the polymerizable liquid crystal compound represented by the formula (II) exhibits maximum absorption in a wavelength range of 300 nm or more and 400 nm or less. 5. Claim 5 containing the polymerizable liquid crystal compound represented by the formula (II) in an amount of 0.1 part by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the polymerizable liquid crystal compound represented by the formula (I). Alternatively, the polymerizable liquid crystal composition according to 6. A cured product of the polymerizable liquid crystal composition according to any one of claims 5 to 7, which comprises a liquid crystal cured film formed by curing the polymerizable liquid crystal compound in the polymerizable liquid crystal composition in an oriented state. Phase difference film. The liquid crystal cured film has the formulas (1), (2) and (3):
Re (450) / Re (550) ≤ 1.00 (1)
1.00 ≤ Re (650) / Re (550) (2)
100 nm ≤ Re (550) ≤ 180 nm (3)
[In the formula, Re (λ) indicates the in-plane retardation value of the cured liquid crystal film at a wavelength of λ nm, and Re = (nx (λ) −ny (λ)) × d (d is the thickness of the cured liquid crystal film). Nx represents the main refractive index at a wavelength of λ nm in the direction parallel to the plane of the cured liquid crystal film in the refractive elliptical body formed by the cured liquid crystal film, and ny represents the main refractive index at the wavelength λ nm formed by the cured liquid crystal film. , Represents the refractive index at wavelength λ nm in the direction parallel to the plane of the liquid crystal cured film and orthogonal to the nx direction)]
The retardation film according to claim 8, which has the optical characteristics represented by. The liquid crystal cured film has the formulas (4), (5) and (6):
Rth (450) / Rth (550) ≤ 1.00 (4)
1.00 ≤ Rth (650) / Rth (550) (5)
-100nm ≤ Rth (550) ≤ -40nm (6)
[In the formula, Rth (λ) indicates the phase difference value in the thickness direction of the cured liquid crystal film at the wavelength λ nm, and Rth = ((nx (λ) + ny (λ)) / 2-nz) × d (d is). Represents the thickness of the cured liquid crystal film, nx represents the refractive index at the wavelength λ nm in the direction parallel to the plane of the cured liquid crystal film in the refractive index ellipse formed by the cured liquid crystal film, and ny represents the cured liquid crystal film. Refractive index In an elliptical body, it represents the refractive index at a wavelength of λ nm which is parallel to the plane of the cured liquid crystal film and perpendicular to the direction of nx, and nz is the refractive index formed by the cured liquid crystal film. In the elliptical body, it represents the refractive index at the wavelength λ nm in the direction perpendicular to the plane of the liquid crystal cured film)]
The retardation film according to claim 8, which has the optical characteristics represented by. An elliptical polarizing plate including the retardation film and the polarizing film according to any one of claims 8 to 10. The organic EL display device including the elliptical polarizing plate according to claim 11. The flexible image display device having the elliptical polarizing plate according to claim 11. The flexible image display device according to claim 13, further comprising a window and a touch panel touch sensor.