WO2018003482A1

WO2018003482A1 - Liquid crystal composition and liquid crystal display element using same

Info

Publication number: WO2018003482A1
Application number: PCT/JP2017/021753
Authority: WO
Inventors: 篤生小林; 英彦山口; 原　智章
Original assignee: Dic株式会社
Priority date: 2016-06-29
Filing date: 2017-06-13
Publication date: 2018-01-04
Also published as: JPWO2018003482A1; JP6394830B2

Abstract

[Problem] To provide a liquid crystal display element that has high light resistance, suffers neither image sticking nor other display defects, and has excellent display quality. [Solution] The present invention provides: a liquid crystal composition containing a liquid crystal compound that, when excited by light having a wavelength shorter than 400 nm, has a total fluorescence intensity of 5,000 RFU (relative light unit) or less; and a liquid crystal display element using the same. This liquid crystal composition has a high voltage-holding ratio (VHR (UV)) after UV irradiation. This liquid crystal composition is extremely practical as a liquid crystal composition for liquid crystal displays, and a display element employing this liquid crystal composition is prevented or inhibited from experiencing display defects and can achieve excellent display quality and a high-speed response.

Description

Liquid crystal composition and liquid crystal display device using the same

The present invention relates to a liquid crystal composition useful as an electro-optical liquid crystal display material.

Liquid crystal display elements are used in various measuring instruments, automobile panels, word processors, electronic notebooks, printers, computers, televisions, watches, advertisement display boards, etc., including clocks and calculators. Typical examples of liquid crystal display systems include TN (twisted nematic) type, STN (super twisted nematic) type, and VA (vertucallyucaligned) type characterized by vertical alignment using TFT (thin film transistor: transistor). And IPS (in-plane switching) type / FFS (fringe field switching) type characterized by horizontal alignment.

In these display systems, IPS type, ECB type (Electrically Controlled Birefringence), VA type, CSH (color super homeotropic) type, etc. use a liquid crystal material having a negative dielectric anisotropy (Δε). Has characteristics. On the other hand, a liquid crystal composition having a positive Δε is used in a horizontal alignment type display such as a TN type, STN type, or IPS type. In recent years, there has been reported a driving method in which a liquid crystal composition having a positive Δε is vertically aligned when no voltage is applied and an IPS type / FFS type electric field is applied to display. All these driving methods require low voltage driving, high-speed response, and a wide operating temperature range. That is, the absolute value of Δε is large, the viscosity (η) is small, and a high nematic phase-isotropic liquid phase transition temperature (T _ni ) is required. Further, from the setting of Δn × d, which is the product of refractive index anisotropy (Δn) and cell gap (d), it is necessary to adjust Δn of the liquid crystal composition to an appropriate range according to the cell gap. In addition, when applying a liquid crystal display element to a television or the like, since high-speed response is important, a liquid crystal composition having a small γ ₁ is required. In order to make Δε, Δn, etc. optimal for individual display elements, the liquid crystal composition is generally composed of several to several tens of compounds.

In addition to the requirements regarding the physical properties of these liquid crystal compositions, the liquid crystal compositions used for liquid crystal display elements are required to be stable against external stimuli such as moisture, air, heat, and light. If the stability against external stimuli is impaired, display defects such as image sticking and display unevenness occur in the liquid crystal display element. In order to suppress display defects such as burn-in and display unevenness, it is generally considered that a high voltage holding ratio (VHR) is essential. For this reason, for example, an antioxidant or a light stabilizer is specified. It is known to use a liquid crystal composition in combination with the above compound (Patent Document 1 and Patent Document 2). This stability to external stimuli is regarded as important in every application, and further development of a liquid crystal composition capable of realizing a high VHR has been demanded.

Further, in a liquid crystal composition that requires a high-speed response such as a liquid crystal television, η is sufficiently small, γ ₁ is sufficiently small, and an elastic constant (K ₃₃ ) is large without reducing Δn and T _ni. In addition, a high VHR was demanded. In addition, there has been a demand for a liquid crystal display element with excellent response and display quality, in which display defects such as image sticking and display unevenness are suppressed or suppressed.

JP 2014-84460 A JP 2014-84462 A

The problem to be solved by the present invention is to provide a liquid crystal composition that is stable against heat and light and can maintain a high voltage holding ratio, and further, there is no display defect such as image sticking or display unevenness by using this composition. An object of the present invention is to provide a liquid crystal display element that is suppressed and has excellent display quality.

In order to solve the above problems, the present inventors have studied various compounds and various compositions, and as a result, can suppress the above problems by suppressing deterioration of the liquid crystal compounds and the liquid crystal compositions at the initial stage. As a result, the present invention has been completed.
That is, the present invention provides a liquid crystal composition in which the total amount of fluorescence intensity of a liquid crystal compound excited by light having a wavelength shorter than 400 nm is 10000 RFU (relative light unit) or less.

Since the liquid crystal composition of the present invention is stable against heat and light and can maintain a high voltage holding ratio, display defects such as image sticking and display unevenness are not caused or suppressed by using this liquid crystal display element. Thus, a liquid crystal display element having excellent display quality can be obtained.

The present inventor examined various liquid crystal compounds and various liquid crystal compositions, and studied the deterioration mechanism of the liquid crystal compounds and liquid crystal compositions. A liquid crystal composition used for a liquid crystal display element is exposed to light and / or heat in a process such as curing of a sealing agent for sealing the liquid crystal composition during the production of the liquid crystal display element. Further, the manufactured liquid crystal display element is also exposed to light or placed in a high temperature environment. The liquid crystal compound is excited by an external stimulus such as light or heat. A compound in an excited state is deactivated by a further external stimulus and subsequently cleaved to generate a radical. Since the generated radical compound causes an addition reaction to generate ions, these reaction products are present in a large amount as impurities in the liquid crystal composition. As a result, it is considered that the stability of the liquid crystal composition is impaired and the quality of the liquid crystal display element is lowered.

The present inventor has found that the deterioration of the liquid crystal compound can be suppressed by the initial stage of deterioration, that is, the action of reducing the liquid crystal compound in the excited state, and a highly stable liquid crystal composition can be obtained.

In addition to the action of suppressing the liquid crystal compound from being in an excited state, the present inventor is more stable due to the action of reducing the amount of the radical compound by capturing the radical compound generated in the liquid crystal composition. It was found that a liquid crystal composition having a high thickness can be obtained.

In the liquid crystal composition of the present invention, the total amount of fluorescence intensity of the liquid crystal compound excited by light having a wavelength shorter than 400 nm is 10000 RFU (relative light unit) or less. Thereby, the excited state of the liquid crystal compound in a liquid crystal composition is suppressed. The value of RFU is preferably as small as possible. Preferably, the total amount of fluorescence intensity is 9000 RFU or less, 8000 RFU or less, 7000 RFU or less, 6000 RFU or less, 5000 RFU or less, 4000 RFU or less, or 3000 RFU or less. Yes, 2500 RFU or less, 2300 or less, 2000 or less, 1500 or less, 1300 or less, 1000 or less, 500 or less, and most preferably 0.

In the liquid crystal composition, the total amount of fluorescence intensity of the liquid crystal compound excited by light having a wavelength shorter than 400 nm can be measured using a spectrophotometer. The measurement of the liquid crystal composition with a spectrophotometer can be performed by irradiating light with the liquid crystal composition as a liquid column of 1 mm × 1 mm × 1 mm, for example. When the liquid column as a sample is small, it can be measured using an ultra-trace spectrophotometer nanodrop (NANO Drop). The light to be irradiated has a wavelength shorter than 400 nm, preferably 390 nm or less, preferably 380 nm or less, preferably 370 nm or less, and preferably 365 or less. Further, the wavelength is preferably longer than 10 nm, preferably 50 nm or more, preferably 80 nm or more, preferably 100 nm or more, preferably 150 nm or more, and 200 nm or more. Preferably, it is 250 nm or more, and preferably 300 nm or more.

The liquid crystal composition in the present invention is a compound that absorbs light irradiated into the liquid crystal composition and / or a compound that decreases the fluorescence intensity of the liquid crystal compound (hereinafter referred to as “irradiated into the liquid crystal composition”. The compound that absorbs light and / or the compound that lowers the fluorescence intensity of the liquid crystal compound is preferably referred to as “compound A”). By containing the compound A, the liquid crystal compound can be prevented from being in an excited state and / or the energy of the excited liquid crystal compound can be absorbed to return the liquid crystal compound to the ground state. Therefore, the liquid crystal compound in an excited state can be reduced by containing the compound A.

Compound A is preferably a compound having an absorption peak of 400 nm or less, preferably a compound of 395 nm or less, preferably 390 or less, preferably a compound of 385 or less, and preferably a compound of 380 nm or less.

Compound A is preferably a compound having an excitation lifetime of 10 ⁻⁸ seconds or less.

The molecular weight of Compound A is preferably 1000 or less, more preferably 600 or less, and even more preferably 400 or less. This is because when the molecular weight is 400 or less, the dispersibility in the liquid crystal composition is high, and the compound A is likely to exist between the liquid crystal compounds. Moreover, it is preferable also in the point which is excellent in the solubility to a liquid-crystal composition. The molecular weight is preferably 1000 or less, preferably 800 or less, preferably 600 or less, preferably 500 or less, and preferably 400 or less.

Compound A is preferably a benzotriazole compound, a triazine compound, a benzophenone compound, a benzoate compound, or a thioether compound. Of these, benzophenone compounds and benzotriazole compounds are preferred. Moreover, the compound which has a phenol structure is preferable.

The benzotriazole-based compound is preferably a compound represented by the following general formula (A-1).

(Wherein R ^A1 represents a hydrogen atom, a hydroxyl group, a carboxyl group, a hydroxyl group or an alkyl group having 1 to 20 carbon atoms, and one or two or more non-adjacent —CH ₂ present in the alkyl group. Each independently represents —O—, —S—, —CO—, —CO—O—, —O—CO—, —CO—S—, —S—CO—, —O—CO—O—. , —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH— , —C≡C—, —Si (CH ₃ ) ₂ —, a trans 1,4-cyclohexylene group, a 1,4-phenylene group, or a naphthalene-2,6-diyl group, in R ^A1 1 or 2 or more hydrogen atoms are independently substituted with a fluorine atom, a chlorine atom or a cyano group. It may have been,
R ^A2 represents a hydrogen atom, a hydroxyl group, a carboxyl group, a hydroxyl group, an alkyl group having 1 to 20 carbon atoms, or the following general formula (A-1a)

(Wherein R ^A1a represents a hydrogen atom, a hydroxyl group, a carboxyl group, a hydroxyl group or an alkyl group having 1 to 20 carbon atoms, and one or two or more non-adjacent —CH ₂ present in the alkyl group) Each independently represents —O—, —S—, —CO—, —CO—O—, —O—CO—, —CO—S—, —S—CO—, —O—CO—O—. , —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH— , —C≡C—, —Si (CH ₃ ) ₂ —, a trans 1,4-cyclohexylene group, a 1,4-phenylene group, or a naphthalene-2,6-diyl group, in R ^A1 Each of one or more hydrogen atoms independently represents a fluorine atom, a chlorine atom or a cyano group. It may have been conversion,
n ^A1a represents 0, 1, 2, 3 or 4;
Z ^A1a is a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, —COO— or —OCO—. Represents
A black dot in the formula represents a bond to the general formula (A-1). )
And one or two or more non-adjacent —CH ₂ — present in the alkyl group in R ^A2 are each independently —O—, —S—, —CO—. , —CO—O—, —O—CO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH— COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, —C≡C—, —Si (CH ₃ ) ₂ —, Trans 1 , 4-cyclohexylene group, 1,4-phenylene group or naphthalene-2,6-diyl group, and one or more hydrogen atoms in R ^A1 are each independently a fluorine atom, Optionally substituted with a chlorine atom or a cyano group,
n ^A1 represents 0, 1, 2, 3 or 4;
n ^A2 represents 0, 1, ² , 3, 4 or 5. )
R ^A1 and R ^A2 are preferably a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms, and 1 to 10 carbon atoms. And an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms is more preferable. The alkyl group, alkoxy group or alkenyl group may be linear or branched.

n ^A1 and n ^A1a are preferably 0 or 1.

n ^A2 is preferably 0, 1, 2 or 3.

The total content of Compound A is preferably 0.001% by mass or more and 5% by mass or less in the liquid crystal composition. More preferably, the upper limit of the total content of these compounds is preferably 4% by mass or less, preferably 3% by mass or less, and preferably 2.5% by mass or less. % Or less, preferably 1.5% by mass or less, preferably 1.3% by mass or less, preferably 1.0% by mass or less, and 0.8% by mass or less. It is preferable that it is 0.5 mass% or less, and it is preferable that it is 0.5 mass% or less. On the other hand, the lower limit of the total content of these compounds is preferably 0.003% by mass or more, preferably 0.005% by mass or more, and preferably 0.008% by mass or more. 0.01% by mass or more, preferably 0.03% by mass or more, preferably 0.05% by mass or more, preferably 0.08% by mass or more, 0.1% It is preferable that it is mass% or more.

The liquid crystal composition of the present invention preferably further contains one or more compounds that trap radicals.

The compound that traps radicals is preferably a hindered amine compound (hereinafter, the hindered amine compound is referred to as “compound B1” in this specification). Compound B1 is preferably a compound represented by the following general formula (i) or general formula (ii).

(Wherein R ⁱ⁰ represents a hydrogen atom, a hydroxyl group, —O., Or an alkyl group having 1 to 20 carbon atoms, and one or two or more non-adjacent —CH ₂ present in the alkyl group) Each independently represents —O—, —S—, —CO—, —CO—O—, —O—CO—, —CO—S—, —S—CO—, —O—CO—O—. , —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH— , —C≡C—, —Si (CH ₃ ) ₂ —, a trans 1,4-cyclohexylene group, a 1,4-phenylene group or a naphthalene-2,6-diyl group, and R ⁱ⁰ 1 or 2 or more hydrogen atoms may be independently substituted with a fluorine atom, a chlorine atom or a cyano group. Ku,
R ⁱ¹ , R ⁱ² , R ⁱ³ and R ⁱ⁴ each independently represents an alkyl group having 1 to 12 carbon atoms, and R ⁱ¹ and R ⁱ² and / or R ⁱ³ and R ⁱ⁴ are bonded to each other to form a ring. You may,
^{^R ^i5,} R i6, R ⁱ⁷ and ^{R i8} are each independently a hydrogen atom or an alkyl group having 1 to 12 carbon ^atoms, when ^{R II5} and ^{R II6} and / or ^{the R II7} and ^{R II8} represents an alkyl group , wherein ^{R II5} and ^{R II6} and / or ^{R II7} and ^{R II8} may be bonded to each other to form a ring,
n ⁱ represents 0 or 1,
m ⁱ represents an integer of 1-6, ^{M i} represents 1 to hexavalent organic group, the valence of ^{M i} is the same number as the number represented by ^{^{^{m i, R i0, R i1}}} , R i2, When there are a plurality of R ⁱ³ , R ⁱ⁴ , R ⁱ⁵ , R ⁱ⁶ , R ⁱ⁷ , R ⁱ⁸ and n ⁱ , they may be the same or different. )

(Wherein R ⁱⁱ⁰ represents a hydrogen atom, a hydroxyl group, —O ·, or an alkyl group having 1 to 20 carbon atoms, and one or two or more non-adjacent —CH ₂ present in the alkyl group) Each independently represents —O—, —S—, —CO—, —CO—O—, —O—CO—, —CO—S—, —S—CO—, —O—CO—O—. , —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH— , —C≡C—, —Si (CH ₃ ) ₂ —, a trans 1,4-cyclohexylene group, a 1,4-phenylene group or a naphthalene-2,6-diyl group may be substituted in R ⁱⁱ⁰ 1 or 2 or more hydrogen atoms are each independently substituted with a fluorine atom, a chlorine atom or a cyano group It may be,
R ⁱⁱ¹ , R ⁱⁱ² , R ⁱⁱ³ and R ⁱⁱ⁴ each independently represent an alkyl group having 1 to 12 carbon atoms, and R ⁱⁱ¹ and R ⁱⁱ² and / or R ⁱⁱ³ and R ⁱⁱ⁴ are bonded to each other to form a ring. You may,
n ⁱⁱ represents 0 or 1,
t represents 1 to 4, U represents a 2 × t-valent organic group forming a ring structure, R ⁱⁱ⁰ , R ⁱⁱ¹ , R ⁱⁱ² , R ⁱⁱ³ , R ⁱⁱ⁴ , R ⁱⁱ⁵ , R ⁱⁱ⁶ , R ⁱⁱ⁷ , R ^{If ii8} and n ⁱⁱ there are a plurality, they may be different even in the same. )
In general formula (i) and general formula (ii), R ⁱ⁰ and R ⁱⁱ⁰ are each a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or an alkyl group having 1 to 20 carbon atoms from the viewpoint of compatibility with the liquid crystal composition. It is preferably an alkoxy group or an alkenyl group having 2 to 20 carbon atoms, and is an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 3 to 12 carbon atoms. Is more preferable. The alkyl group, alkoxy group or alkenyl group is preferably linear or molecular, and preferably linear. In view of ease of production, a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms is particularly preferable. In order to enhance the ability to prevent photodegradation, a hydrogen atom or a hydroxyl group is preferable, and a hydrogen atom is particularly preferable.

R ⁱ¹ , R ⁱ² , R ⁱ³ , R ⁱ⁴ , R ⁱⁱ¹ , R ⁱⁱ² , R ⁱⁱ³ and R ⁱⁱ⁴ are preferably each independently an alkyl group having 1 to 4 carbon atoms, A methyl group is particularly preferred from the viewpoint of the stability of the compound. In order to facilitate removal of polar impurities mixed during production, R ⁱ¹ and R ⁱ² and / or R ⁱ³ and R ⁱ⁴ are preferably bonded to each other to form a ring structure. Similarly, R ⁱⁱ¹ and R ⁱⁱ² and / or R ⁱⁱ³ and R ⁱⁱ⁴ are preferably bonded to each other to form a ring structure.

R ⁱ⁵ , R ⁱ⁶ , R ⁱ⁷ , R ⁱ⁸ , R ⁱⁱ⁵ , R ⁱⁱ⁶ , R ⁱⁱ⁷ and R ⁱⁱ⁸ are each independently preferably a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, An alkyl group having 1 to 4 carbon atoms is preferable, and a hydrogen atom or a methyl group is particularly preferable from the viewpoint of availability of raw materials and stability of the compound.

In the compound represented by the general formula (i), m ⁱ is an integer of 1-6, M ⁱ represents 1 to hexavalent organic group, as many valence of M ⁱ is represented by n ⁱ although, m ⁱ is 3, M ⁱ is preferably a trivalent organic group.

If m ⁱ represents 3, ^{M i} is the general formula (i-M)

(Wherein Z ¹ , Z ² and Z ³ are each independently —O—, —S—, —CH═CH—, —C≡C—, —CO—, —CO—O—, —O It represents —CO—, —OCF ₂ —, —CF ₂ O—, —NH— or a single bond.
Sp ¹ , Sp ² and Sp ³ each independently represent a single bond or an alkylene group having 1 to 10 carbon atoms, and one or more —CH ₂ — present in the alkylene group is independently Substituted with —O—, —S—, —CH═CH—, —C≡C—, —CO—, —CO—O—, —O—CO—, —OCF ₂ — or —CF ₂ O—. May be.
A is

(In the formula, R ⁸ represents a hydrogen atom, —OH or an alkyl group having 1 to 10 carbon atoms, and one or two or more —CH ₂ — present in the alkyl group are each independently —O—, —S—, —CH═CH—, —C≡C—, —CO—O—, —O—CO— may be substituted, and the hydrogen atom in the cyclic structure is a halogen atom or (It may be substituted with a cyano group.)
Represents a group selected from: )
In order to improve the compatibility with the liquid crystal composition and the storage stability, it is preferable.

Here, in terms of ease of production and availability of raw materials, at least one of Z ¹ , Z ² and Z ³ preferably represents —O—, —CO—O— or a single bond, and Z ¹ , It is particularly preferred that all of Z ² and Z ³ represent —O—, —CO—O— or a single bond. Sp ¹ , Sp ² and Sp ³ preferably represent a single bond or an alkylene group having 1 to 10 carbon atoms, preferably a single bond or an alkylene group having 1 to 8 carbon atoms, Alternatively, it is more preferably an alkylene group having 1 to 4 carbon atoms. The alkylene group is unsubstituted, or one or more —CH ₂ — present in the alkylene group is each independently —O—, —CO—, —CO—O— or —O—. It is preferably substituted with CO-, more preferably unsubstituted. ^{Specifically,} Sp ^1, Sp ² and ^Sp 3 _{_{_{are, -CO -, - CH 2 -CO}}} -, - CH 2 -CH 2 -CO -, - CH 2 -O -, - CH 2 -CH 2 - _{_{_{_{O -, - CH 2 -CH 2}}}} -CH 2 -O -, - CH 2 -O-CO -, - CH 2 -CH 2 -O-CO -, - CH 2 -CH 2 -CH 2 -O-CO Particularly preferred is an unsubstituted alkylene group having 1 to 4 carbon atoms or a single bond.

In addition, —Sp ¹ —Z ¹ —, —Sp ² —Z ² —, and —Sp ² —Z ² — are each independently —CO—O—, —CH ₂ —CO—O—, —CH ₂ —. _{_{_{_{CH 2 -CO-O -, -}}}} CH 2 -CH 2 --CH 2 -CO-O -, - CH 2 -O -, - CH 2 -CH 2 -O -, - CH 2 -CH 2 -CH 2 _{-O -, - CH 2 -O-} CO-O -, - preferably CH 2 -CH 2 -O-CO- O- or _{_{_{-CH 2 -CH 2 -CH 2 -O-}}} CO-O- in which _{, -CO-O -, - CH} 2 -CO-O- or more preferably _{_-CH} 2 _-CH 2 -CO-O- and which.

A is

(In the formula, R ⁸ represents a hydrogen atom, —OH or an alkyl group having 1 to 10 carbon atoms, and one or two or more —CH ₂ — present in the alkyl group are each independently A liquid crystal having a structure represented by —O—, —S—, —CH═CH—, —C≡C—, —CO—O— or —O—CO—. It is more preferable to improve the compatibility with the composition and the storage stability. Here, R ⁸ is a hydrogen atom, —OH, an alkyl group having 2 to 10 carbon atoms, —O—CO—R ⁹ (R ⁹ is 1 carbon atom) because of the ease of production and the availability of raw materials. Represents an alkyl group of ˜9, and particularly preferably represents a hydrogen atom.

Specifically, ^{compounds n i} is 3 as a general formula (i) is a compound represented by the general formula (i-a1) ~ (i -a14) are particularly preferred.

(R ¹¹ , R ¹² and R ¹³ in the formula independently represent the same meaning as R ⁱ⁰ in the general formula (I).)
Further, the compound represented by the general formula (i) is preferably a compound represented by the following general formula (I-1).

In general formula (i-1), R ^is each independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and is particularly preferably a hydrogen atom. When it is an alkyl group, it preferably has 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, and 1 carbon atom. Further preferred. When a plurality of ^RHS are present, they may be the same or different.

M ^iS represents an alkyl group having 1 to 15 carbon atoms when m ^iS represents 1, and represents an alkylene group having 1 to 15 carbon atoms when m ^iS represents an integer of 2 to 6, and is present in M ^iS One or more —CH ₂ — represents —O—, —CH═CH—, —C≡C—, —CO—, —OCO—, —COO—, trans-1,4-cyclohexylene group, 1 , 4-phenylene group and naphthalene-2,6-diyl group may be substituted, but considering the viscosity given to the liquid crystal composition and its volatility, M ^iS is an alkyl group having 2 to 10 carbon atoms or An alkylene group is preferable, an alkyl group or alkylene group having 2 to 8 carbon atoms is preferable, an alkyl group or alkylene group having 4 to 8 carbon atoms is preferable, and an alkyl group or alkylene group having 6 or 8 carbon atoms is preferable. M ^iS may be linear or branched.

m ^iS represents an integer of 1 to 6, and preferably 2 to 4.

When m ^iS represents 1, the compound represented by the general formula (i-1) is preferably a compound represented by the general formula (i-11) or the general formula (i-12).

(Wherein R ^H11 independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and M represents an alkylene group having 1 to 13 carbon atoms.)

(In the formula, R ^is and R ⁱ¹¹ each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.)
When ^miS represents 2, the compound represented by the general formula (i-1) is preferably a compound represented by the general formula (i-2).

(In the formula, R ^H1 and R ^H2 each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and M represents an alkylene group having 1 to 15 carbon atoms. One or more —CH ₂ — is —O—, —CH═CH—, —C≡C—, —CO—, —OCO—, —COO—, trans-1,4-cyclohexylene group, 1, (It may be substituted with a 4-phenylene group or a naphthalene-2,6-diyl group.)
In general formula (i-2), R ^H1 and R ^H2 are particularly preferably hydrogen atoms. When it is an alkyl group, it preferably has 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, and 1 carbon atom. Further preferred.
In general formula (i-2), M represents an alkylene group having 1 to 15 carbon atoms. However, considering the viscosity given to the liquid crystal composition and its volatility, M is an alkylene group having 2 to 10 carbon atoms. Preferably, alkylene having 4 to 8 carbon atoms is preferable, and alkylene having 6 or 8 carbon atoms is preferable.
Specific examples include compounds represented by general formula (i-24), general formula (i-26), and general formula (i-28). R ^H1 and R ^{H2 in} these formulas are as described above.

When ^miS represents an integer of 3 to 6, the compound represented by the general formula (i-1) is preferably a compound represented by the general formula (i-3).

(In the formula, R ^H3 , R ^H4 and R ^H5 each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms. N ^H1 and n ^H2 each independently represent 0 or 1 n. ^H3 represents an integer of 1 to 4. When n ^H3 is 2, 3 or 4, and a plurality of R ^H5 are present, they may be the same or different.
In general formula (i-3), R ^H3 , R ^H4 and R ^H5 are particularly preferably hydrogen atoms. When it is an alkyl group, it preferably has 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, and 1 carbon atom. Further preferred.

In the general formula (i-3), when n ^H3 represents 1, it is preferable to represent the above general formula (i-a1) to general formula (i-a3). In the general formula (i-3), when n ^H3 represents 2, compounds represented by the following general formula (i-31) and general formula (i-32) are preferable. R ^H3 , R ^H4 and R ^{H5 in} these formulas are as described above.

Examples of the compound n ⁱ represents 0 in the compound represented by the general formula (i), the following compounds are preferred.

The compound represented by the general formula (ii) is preferably a compound represented by the following general formula (ii-1) or general formula (ii-2).

(In the formula, R ⁱⁱ¹⁰ represents a hydrogen atom or a hydroxyl group, R ⁱⁱ¹² represents a hydrogen atom or a monovalent organic group,
Sp ⁱⁱ¹ represents a single bond or an alkylene group having a carbon number of from 12, one -CH ₂ present in the alkylene group - or nonadjacent two or more -CH ₂ - is -O -, - May be replaced by COO—, —OCO—, —CH═CH— or —C≡C—,
A ⁱⁱ¹ each independently (a) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - is replaced by -O- May be.)
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or 1,2 , 3,4-tetrahydronaphthalene-2,6-diyl group, one —CH═ or two or more non-adjacent —CH═ may be replaced by —N═.
Each of the groups (a), (b) and (c) is independently substituted with a cyano group, a fluorine atom, a chlorine atom, a methyl group or a methoxy group. R ⁱⁱ¹¹ may be a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a general formula ( ^ie )

(Wherein R ^e1 represents a hydrogen atom or a hydroxyl group, Sp ^ie1 represents a single bond or an alkylene group having 1 to 12 carbon atoms, and one —CH ₂ — present in the alkylene group or adjacent thereto. And two or more —CH ₂ — may be replaced by —O—, —COO—, —OCO—, —CH═CH— or —C≡C—, and s1 represents 0 or 1.)
In represents a ^group represented by one -CH present in ^{R ii11} ₂ - or nonadjacent two or more -CH ₂ - is -O -, - S -, - COO -, - OCO- , -CO-, -CH = CH- or -C≡C-
n ⁱⁱ¹ represents 0 or 1, and p ⁱⁱ represents 0, 1 or 2, but when p ⁱⁱ represents 2, a plurality of Spii1 and Aii2 may be independently the same or different. . )

(In the formula, R ⁱⁱ¹⁰ and R ⁱⁱ²¹ each represent a hydrogen atom or a hydroxyl group, and n ⁱⁱ² , l, o, and r each independently represent 0 or 1)
Further, the compound that traps radicals is preferably a hindered phenol-based compound (hereinafter, the hindered phenol-based compound is referred to as “compound B2”). Compound B2 is preferably a compound represented by Formula (H1).

(In the formula, X ^y represents a hydrocarbon having 1 to 25 carbon atoms (one or more —CH ₂ — in the hydrocarbon is —O—, —CO— , -COO-, or -OCO- may be substituted.), Represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group, and the 1,4-phenylene group has an arbitrary hydrogen atom as fluorine. May be substituted by an atom,
M ^y is -CH ₂ 1, two or more of the alkylene group (the alkylene group having from 1 to 15 carbon atoms - as the oxygen atoms are not directly adjacent, -O -, - CO -, - COO- , it may be substituted in _{_{-OCO-), -. OCH 2 -}} , - CH 2 O -, - COO -, - OCO -, - CF 2 O -, - OCF 2 -, - CF 2 CF 2 - , —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, —C≡C—, single bond, 1, A 4-phenylene group and a trans-1,4-cyclohexylene group are represented. In the 1,4-phenylene group, an arbitrary hydrogen atom may be substituted with a fluorine atom, and l represents an integer of 2 to 6. )
Examples of the antioxidant represented by the general formula (H1) include the following general formula (H1-I)

(Wherein M ^x is a hydrocarbon having 1 to 25 carbon atoms (one or two or more —CH ₂ — in the hydrocarbon is —O—, —CO— X represents an alkylene group having 1 to 15 carbon atoms (one or more of —CH ₂ — in the alkylene group represents oxygen, and —COO— may be substituted with —OCO—). It may be substituted with —O—, —CO—, —COO—, —OCO— so that the atoms are not directly adjacent to each other.), —OCH ₂ —, —CH ₂ O—, —COO—, —OCO —, —CF ₂ O—, —OCF ₂ —, —CF ₂ CF ₂ —, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH -, -CH = CH-, -C≡C-, single bond, 1,4-phenylene group, trans-1,4-cycl Represents a hexylene group, and a 1,4-phenylene group in which any hydrogen atom may be replaced by a fluorine atom, a, b, c and d each independently represents 0 or 1, but a + b + c + d is 2 or more Is more preferable.

M ^x is a hydrocarbon having 2 to 15 carbon atoms (one or more —CH ₂ — in the hydrocarbon is —O—, —CO—, —COO— so that oxygen atoms are not directly adjacent to each other). X may be an alkylene group having 2 to 15 carbon atoms (one or more of —CH ₂ — in the alkylene group is directly adjacent to an oxygen atom) May be substituted with —O—, —CO—, —COO—, —OCO—), preferably a single bond, 1,4-phenylene group, or trans-1,4-cyclohexylene group. , A + b + c + d is more preferably 2 to 4, and 2 is particularly preferable.

In the general formula (HI), M ^x is more preferably an alkylene group having 1 to 15 carbon atoms. In consideration of volatility, a large carbon number is preferable, and in consideration of viscosity, the carbon number is not too large. Is preferred. From the above, M ^x has more preferably 2 to 15 carbon atoms, and particularly preferably 2 to 10 carbon atoms.

Further, the compound B2 is preferably a compound represented by the general formula (H2).

(In the general formula (H2), R ^H21 represents a straight-chain alkyl group or a branched-chain alkyl group having 1 to 22 carbon atoms, and one or more —CH ₂ — in the alkyl group represents an oxygen atom. May be substituted with —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF ₂ O— or —OCF ₂ — so that they are not directly adjacent to each other. ,
a ^H2 represents 0, 1 or 2,
M ^H21 represents (a) a trans-1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more non-adjacent —CH ₂ — represents —O— or —S—). Or may be replaced by
(B) a 1,4-phenylene group (one —CH═ present in this group or two or more non-adjacent —CH═ may be replaced by —N═), and (c) ) 1,4-bicyclo (2.2.2) octylene group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6 Represents a group selected from the group consisting of a -diyl group or a chroman-2,6-diyl group, but one or more of the groups (a), (b) or (c) each represents a hydrogen atom a fluorine atom, a trifluoromethyl group, may be substituted by a trifluoromethoxy group or a chlorine atom, if M ^H21 represents a ^H2 2 there are a plurality, M ^H21 there are a plurality had the same Can be different,
Z ^H21 is a single _{_{bond, -CH 2 CH 2 -, -}} CH = CH -, - C≡C -, - CH 2 O -, - OCH 2 -, - CF 2 O -, - OCF 2 -, - COO- Alternatively, -OCO- is represented, but when a ^H2 represents 2 and a plurality of Z ^H21 are present, the plurality of Z ^H21 may be the same or different. )
Specifically, the compounds represented by general formula (H1) and general formula (H2) are preferably represented by general formula (H-1) to general formula (H-4).

In general formulas (H-1) to (H-4), R ^H1 represents an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or It represents an alkenyloxy group having 2 to 10 carbon atoms, one -CH ₂ present in the radical - or non-adjacent two or more -CH ₂ - are each independently -O- or -S- In addition, one or two or more hydrogen atoms present in the group may be each independently substituted with a fluorine atom or a chlorine atom. More specifically, it is an alkyl group having 2 to 7 carbon atoms, an alkoxyl group having 2 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkenyloxy group having 2 to 7 carbon atoms. An alkyl group having 3 to 7 carbon atoms or an alkenyl group having 2 to 7 carbon atoms is more preferable.
In the general formula ^{(H4), M H4} is -CH ₂ 1, two or more of the alkylene group (the alkylene group having from 1 to 15 carbon atoms - as the oxygen atoms are not directly adjacent, - O—, —CO—, —COO—, —OCO— may be substituted.), —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —CF ₂ O—, — OCF ₂ —, —CF ₂ CF ₂ —, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, — C≡C—, a single bond, a 1,4-phenylene group (any hydrogen atom in the 1,4-phenylene group may be substituted with a fluorine atom) or a trans-1,4-cyclohexylene group. Preferably an alkylene group having 1 to 14 carbon atoms, In consideration of the viscosity, a large number of carbon atoms is preferable, but in consideration of the viscosity, the number of carbon atoms is preferably not too large. Therefore, the number of carbon atoms is more preferably 2 to 12, more preferably 3 to 10. 4 to 10 carbon atoms are more preferred, 5 to 10 carbon atoms are more preferred, and 6 to 10 carbon atoms are more preferred.
In general formulas (H-1) to (H-4), one or more non-adjacent —CH═ in the 1,4-phenylene group may be substituted by —N═. In addition, each hydrogen atom in the 1,4-phenylene group may be independently substituted with a fluorine atom or a chlorine atom.
In general formula (H-1) to general formula (H-4), one or more non-adjacent —CH ₂ — in the 1,4-cyclohexylene group is replaced by —O— or —S—. May be. In addition, each hydrogen atom in the 1,4-cyclohexylene group may be independently substituted with a fluorine atom or a chlorine atom.
More specifically, for example, the formulas (H-11) to (H-15) can be given.

In the liquid crystal composition of the present invention, the total amount of Compound B1 and Compound B2 is preferably 0.001% or more, preferably 0.002% or more, as the lower limit in the composition, 0.003% Preferably, it is contained 0.004% or more, preferably 0.005% or more, preferably 0.006% or more, and preferably 0.007% or more. 0.008% or more, preferably 0.009% or more, preferably 0.01% or more, preferably 0.02% or more, 0.03% or more It is preferable to contain 0.04% or more, preferably 0.05% or more, and preferably 0.06% or more. 0.07% or more, preferably 0.08% or more, preferably 0.09% or more, preferably 0.10% or more, 0.11% Preferably, it is contained 0.12% or more, preferably 0.13% or more, preferably 0.14% or more, and preferably 0.15% or more. 0.20% or more, preferably 0.25% or more, preferably 0.30% or more, preferably 0.35% or more, 0.40% or more It is preferable to contain, it is preferable to contain 0.50% or more, and it is preferable to contain 1% or more. Further, the upper limit is preferably 5% or less, preferably 3% or less, preferably 2% or less, preferably 1.5% or less, and preferably 1% or less. Preferably, 0.9% or less, preferably 0.8% or less, preferably 0.7% or less, preferably 0.6% or less, 0.5% It is preferably contained below, preferably 0.45% or below, preferably 0.4% or below, preferably 0.35% or below, preferably 0.3% or below. , 0.25% or less, preferably 0.2% or less, preferably 0.15% or less, preferably 0.1% or less, 0.07 Preferably contains less, preferably it contains more than 0.05%, and preferably 0.03% or less.

More specifically, the content is preferably 0.01 to 2% by mass, more preferably 0.01 to 1% by mass, still more preferably 0.01 to 0.2% by mass. It is particularly preferably from 01 to 0.15% by weight. More specifically, when emphasizing the suppression of precipitation at low temperatures, the content is preferably 0.01 to 0.1% by mass.

In the liquid crystal composition of the present invention, the ratio of the total content of compound A1 to the total content of compound B1 and compound B2 is preferably in the range of 1: 100 to 10000: 1, more preferably In the range of 1:10 to 1000: 1, 1: 1 to 1: 500, and preferably 1: 1 to 1: 100.

The liquid crystal composition of the present invention preferably contains one or more compounds represented by the general formula (II).

(Wherein R ^II1 represents an alkyl group having 1 to 10 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or —OCO—,
A ^II1 and ^{A II2} each independently (a) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - is -O And (b) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ are replaced with —N =). May be.)
(C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or One —CH═ present in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent —CH═ may be replaced by —N═. )
The group (a), the group (b) and the group (c) are each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^II1 represents a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —OCF ₂ —, —CF ₂ O—. -CH = NN-CH-, -CH = CH-, -CF = CF- or -C≡C-
Y ^II1 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group or an alkyl group having 1 to 10 carbon atoms, and one or non-adjacent two or more —CH ₂ — in the alkyl group are each independently Optionally substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—, and one or more hydrogens in the alkyl group The atom may be substituted with a fluorine atom,
m ^II1 each represents 1, 2, 3 or ^4, if ^{m II1} is representative of the 2, 3 or 4, ^{A II1} and ^{Z II1} there is a plurality may be the same or different. )
<First embodiment of compound represented by formula (II)>
The compound represented by the general formula (II) is a so-called p-type liquid crystal compound having a positive dielectric anisotropy, and examples thereof include compounds represented by the following general formula (J).

It is preferable that the compound represented by the general formula (II) contains one or more compounds represented by the general formula (J). These compounds correspond to dielectrically positive compounds (Δε is greater than 2).

(Wherein R ^J1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^J1 represents 0, 1, 2, 3 or 4;
A ^J1 , A ^J2 and A ^J3 are each independently
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O-.)
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or 1,2 , 3,4-tetrahydronaphthalene-2,6-diyl group, one —CH═ or two or more non-adjacent —CH═ may be replaced by —N═.
The group (a), the group (b) and the group (c) are each independently selected from the group consisting of cyano group, fluorine atom, chlorine atom, methyl group, trifluoromethyl group or trifluoro May be substituted with a methoxy group,
Z ^J1 and Z ^J2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, Represents —COO—, —OCO— or —C≡C—,
When n ^J1 is 2, 3 or 4 and a plurality of A ^J2 are present, they may be the same or different, and n ^J1 is 2, 3 or 4 and a plurality of Z ^J1 is present. If they are the same or different,
X ^J1 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. )
In general formula (J), R ^J1 represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or alkenyloxy having 2 to 8 carbon atoms. A group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms is preferable. An alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms is more preferable, an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 3 carbon atoms is more preferable, and an alkenyl group having 3 carbon atoms. (Propenyl group) is particularly preferred.

R ^J1 is preferably an alkyl group when emphasizing reliability, and is preferably an alkenyl group when emphasizing a decrease in viscosity.

Further, when the ring structure to which it is bonded is a phenyl group (aromatic), a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms and carbon An alkenyl group having 4 to 5 atoms is preferable, and when the ring structure to which the alkenyl group is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a linear alkyl group having 1 to 5 carbon atoms, a straight chain A straight-chain alkoxy group having 1 to 4 carbon atoms and a straight-chain alkenyl group having 2 to 5 carbon atoms are preferred. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and is preferably linear.

The alkenyl group is preferably selected from groups represented by any of the formulas (R1) to (R5). (The black dot in each formula represents the carbon atom in the ring structure to which the alkenyl group is bonded.)

A ^J1 , A ^J2 and A ^J3 are preferably aromatic when it is required to independently increase Δn, and are preferably aliphatic to improve the response speed. 1,4-cyclohexylene group, 1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene -2,6-diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, preferably substituted by a fluorine atom It is more preferable to represent the following structure,

It is more preferable to represent the following structure.

Z ^J1 and Z ^J2 each independently preferably represent —CH ₂ O—, —OCH ₂ —, —CF ₂ O—, —CH ₂ CH ₂ —, —CF ₂ CF ₂ — or a single bond, OCH ₂ —, —CF ₂ O—, —CH ₂ CH ₂ — or a single bond is more preferred, and —OCH ₂ —, —CF ₂ O— or a single bond is particularly preferred.

X ^J1 is preferably a fluorine atom or a trifluoromethoxy group, and more preferably a fluorine atom.

n ^J1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when emphasizing the improvement of Δε, and preferably 1 or 2 when emphasizing Tni .

There are no particular restrictions on the types of compounds that can be combined, but they are used in combination according to desired properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. For example, in one embodiment of the present invention, there are one kind, two kinds, and three kinds of compounds to be used. Furthermore, in another embodiment of the present invention, there are four types, five types, six types, and seven or more types.

In the composition of the present invention, the content of the compound represented by the general formula (J) is low temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, It is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the general formula (J) with respect to the total amount of the composition of the present invention is 1%, 10%, 20%, 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The upper limit of the preferable content is, for example, 95%, 85%, 75%, 65%, and 55% with respect to the total amount of the composition of the present invention. Yes, 45%, 35%, 25%.

When the composition of the present invention keeps the viscosity low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the present invention keeps Tni high and a composition having good temperature stability is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

As the compound represented by the general formula (J), a compound represented by the general formula (M) and a compound represented by the general formula (K) are preferable.

The composition of the present invention preferably contains one or more compounds represented by the general formula (M). These compounds correspond to dielectrically positive compounds (Δε is greater than 2).

(Wherein R ^M1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^M1 represents 0, 1, 2, 3 or 4;
A ^M1 and A ^M2 are each independently
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O- or -S- And (b) a 1,4-phenylene group (one —CH═ present in this group or two or more non-adjacent —CH═ may be replaced by —N═).
A hydrogen atom on the group (a) and the group (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^M1 and Z ^M2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, Represents —COO—, —OCO— or —C≡C—,
When n ^M1 is 2, 3 or 4 and a plurality of A ^M2 are present, they may be the same or different, and n ^M1 is 2, 3 or 4 and a plurality of Z ^M1 is present If they are the same or different,
X ^M1 and X ^M3 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
X ^M2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. )
In the general formula (M), R ^M1 represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy having 2 to 8 carbon atoms. A group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms is preferable. An alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms is more preferable, an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 3 carbon atoms is more preferable, and an alkenyl group having 3 carbon atoms. (Propenyl group) is particularly preferred.

R ^M1 is preferably an alkyl group when emphasizing reliability, and is preferably an alkenyl group when emphasizing a decrease in viscosity.

A ^M1 and A ^M2 are preferably aromatic when it is required to independently increase Δn, and are preferably aliphatic for improving the response speed, and trans-1,4 -Cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 2, 3-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6- It preferably represents a diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and more preferably represents the following structure:

It is more preferable to represent the following structure.

Z ^M1 and ^{Z M2} each _{independently} _{-CH 2 O -, - CF 2} O -, - CH 2 CH 2 -, - CF 2 CF 2 - or preferably a single bond, _-CF 2 O-, —CH ₂ CH ₂ — or a single bond is more preferable, and —CF ₂ O— or a single bond is particularly preferable.

n ^M1 is preferably 0, 1, 2, or 3, preferably 0, 1 or 2, preferably 0 or 1 when emphasizing the improvement of Δε, and preferably 1 or 2 when emphasizing Tni .

In the composition of the present invention, the content of the compound represented by the general formula (M) is low-temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, It is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the formula (M) with respect to the total amount of the composition of the present invention is 0%, 1%, 10%, 20%, 30 %, 40%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%. The upper limit of the preferable content is, for example, 95%, 85%, 75%, 65%, and 55% with respect to the total amount of the composition of the present invention. Yes, 45%, 35%, 25%.

Specifically, the liquid crystal compound represented by the general formula (M) preferably has the following general formula (M-1) and general formula (M-2).

(Wherein R ³¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ³¹ and X ³² are each independently hydrogen. An atom or a fluorine atom, Y ³¹ represents a fluorine atom or OCF ₃ , and M ³¹ to M ³³ each independently represents a trans-1,4-cyclohexylene group or a 1,4-phenylene group, One or two —CH ₂ — in the trans-1,4-cyclohexylene group may be substituted with —O— so that the oxygen atom is not directly adjacent to one another. The two hydrogen atoms may be substituted with fluorine atoms, n ³¹ and n ³² each independently represent 0, 1 or 2, and n ⁴¹ + n ⁴² represents 1, 2 or 3.)
Specifically, the liquid crystal compound represented by the general formula (M-1) is preferably a compound represented by the following general formula (M-1-a) to general formula (M-1-f).

^{^{^{(Wherein, R 31, X 31, X}}} 32 and ^{Y 31} are as defined ^R ^{^31, X} ^31, X ³² and ^{Y 31} in the general formula ^{^{(M), X 34 ~ X}} 39 are each independently Represents a hydrogen atom or a fluorine atom.)
Specifically, the liquid crystal compound represented by the general formula (M-2) is preferably a compound represented by the following general formula (M-2-a) to general formula (M-2-n).

^{^{^{(Wherein, R 31, X 31, X}}} 32 and ^{Y 31} are as defined ^R ^{^31, X} ^31, X ³² and ^{Y 31} in the general formula ^{^{(M), X 34 ~ X}} 39 are each independently Represents a hydrogen atom or a fluorine atom.)
Further, specifically, the liquid crystal compound represented by the general formula (M) is preferably from the following general formula (M-3) to general formula (M-26).

^{^{^{(Wherein, R 31, X 31, X}}} 32 and ^{Y 31} are as defined ^R ^{^31, X} ^31, X ³² and ^{Y 31} in the general formula ^{^{(M), X 34 ~ X}} 39 are each independently Represents a hydrogen atom or a fluorine atom.)
It is preferable that the composition of this invention contains 1 type, or 2 or more types of compounds represented by general formula (K). These compounds correspond to dielectrically positive compounds (Δε is greater than 2).

(Wherein R ^K1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^K1 represents 0, 1, 2, 3 or 4;
A ^K1 and A ^K2 are each independently
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O- or -S- And (b) a 1,4-phenylene group (one —CH═ present in this group or two or more non-adjacent —CH═ may be replaced by —N═).
A hydrogen atom on the group (a) and the group (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^K1 and Z ^K2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, Represents —COO—, —OCO— or —C≡C—,
When n ^K1 is 2, 3 or 4 and a plurality of A ^K2 are present, they may be the same or different, and n ^K1 is 2, 3 or 4 and a plurality of Z ^K1 is present If they are the same or different,
X ^K1 and X ^K3 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
X ^K2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. )
In general formula (K), R ^K1 represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or alkenyloxy having 2 to 8 carbon atoms. A group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms is preferable. An alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms is more preferable, an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 3 carbon atoms is more preferable, and an alkenyl group having 3 carbon atoms. (Propenyl group) is particularly preferred.

^RK1 is preferably an alkyl group when importance is placed on reliability, and an alkenyl group is preferred when importance is placed on lowering viscosity.

A ^K1 and A ^K2 are preferably aromatic when it is required to independently increase Δn, and are preferably aliphatic for improving the response speed, and trans-1,4 -Cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 2, 3-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6- It preferably represents a diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and more preferably represents the following structure:

It is more preferable to represent the following structure.

Z ^K1 and ^{Z K2} are each _{independently} _{-CH 2 O -, - CF 2} O -, - CH 2 CH 2 -, - CF 2 CF 2 - or preferably a single bond, _-CF 2 O-, —CH ₂ CH ₂ — or a single bond is more preferable, and —CF ₂ O— or a single bond is particularly preferable.

n ^K1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when emphasizing the improvement of Δε, and preferably 1 or 2 when emphasizing Tni. .

In the composition of the present invention, the content of the compound represented by the general formula (K) is low temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, It is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the formula (K) with respect to the total amount of the composition of the present invention is 1%, 10%, 20%, 30%, 40% %, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The upper limit of the preferable content is, for example, 95%, 85%, 75%, 65%, and 55% with respect to the total amount of the composition of the present invention. Yes, 45%, 35%, 25%.

Specifically, the liquid crystal compound represented by the general formula (K) preferably has the following general formula (K-1) and general formula (K-2).

(Wherein R ⁴¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ⁴¹ and X ⁴² are each independently hydrogen. Y ⁴¹ represents an atom or a fluorine atom, Y ⁴¹ represents a fluorine atom or OCF ₃ , M ⁴¹ to M ⁴³ each independently represents a trans-1,4-cyclohexylene group or a 1,4-phenylene group, One or two —CH ₂ — in the trans-1,4-cyclohexylene group may be substituted with —O— so that the oxygen atom is not directly adjacent to one another. The two hydrogen atoms may be substituted with fluorine atoms, n ⁴¹ and n ⁴² each independently represents 0, 1 or 2, and n ⁴¹ + n ⁴² represents 1, 2 or 3.)
Specifically, the liquid crystal compound represented by the general formula (K-1) is preferably a compound represented by the following general formula (K-1-a) to general formula (K-1-d).

^{^{^{(Wherein, R 41, X 41, X}}} 42 and ^{Y 41} are as defined ^R ^{^41, X} ^41, X ⁴² and ^{Y 41} in the general formula ^{^{(K), X 44 ~ X}} 49 are each independently Represents a hydrogen atom or a fluorine atom.)
Specifically, the liquid crystal compound represented by the general formula (K-2) is preferably a compound represented by the following general formula (K-2-a) to general formula (K-2-g).

^{^{^{(Wherein, R 41, X 41, X}}} 42 and ^{Y 41} are as defined ^R ^{^41, X} ^41, X ⁴² and ^{Y 41} in the general formula ^{^{(K), X 44 ~ X}} 49 are each independently Represents a hydrogen atom or a fluorine atom.)
Further, the liquid crystal compound represented by the general formula (K) is specifically preferably the following general formula (K-3) to general formula (K-5).

^{^{^{(Wherein, R 41, X 41, X}}} 42 and ^{Y 41} are as defined ^R ^{^41, X} ^41, X ⁴² and ^{Y 41} in the general formula ^{^{(K), X 44 ~ X}} 49 are each independently Represents a hydrogen atom or a fluorine atom.)
<Second Embodiment of Compound Represented by General Formula (II)>
The compound represented by the general formula (II) is a so-called n-type liquid crystal compound having a negative dielectric anisotropy and includes compounds represented by the following general formula (LC1) and general formula (LC2). it can.

The compound represented by the general formula (II) preferably contains one or more compounds selected from the compound group represented by the general formula (N-1) to the general formula (N-3).

(Wherein, R ^N11 , R ^N12 , R ^N21 , R ^N22 , R ^N31 and R ^N32 each independently represents an alkyl group having 1 to 8 carbon atoms, and one or non-adjacent 2 in the alkyl group _Two or more —CH ₂ — may be each independently substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—,
A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31, and A ^N32 are each independently (a) a 1,4-cyclohexylene group (one —CH ₂ — or adjacent to each other in this group). Two or more —CH ₂ — that are not present may be replaced by —O—.)
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or 1,2 , 3,4-tetrahydronaphthalene-2,6-diyl group, one —CH═ or two or more non-adjacent —CH═ may be replaced by —N═.
The group (a), the group (b) and the group (c) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^N11 , Z ^N12 , Z ^N21 , Z ^N22 , Z ^N31 and Z ^N32 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—. , —COO—, —OCO—, —OCF ₂ —, —CF ₂ O—, —CH═N—N═CH—, —CH═CH—, —CF═CF— or —C≡C—,
^XN21 represents a hydrogen atom or a fluorine atom,
T ^N31 represents —CH ₂ — or an oxygen atom,
n ^N11 , n ^N12 , n ^N21 , n ^N22 , n ^N31, and n ^N32 each independently represent an integer of 0 to 3, but n ^N11 + n ^N12 , n ^N21 + n ^N22, and n ^N31 + n ^N32 are each independently When there are a plurality of A ^N11 to A ^N32 and Z ^N11 to Z ^N32 , they may be the same or different. However, in the general formula (N-2) and the general formula (N-3), the compound represented by the general formula (N-1) is excluded, and in the general formula (N-3), the general formula (N-2) The compound represented by is excluded. )
The compounds represented by the general formulas (N-1), (N-2), and (N-3) are dielectrically negative compounds (the sign of Δε is negative and the absolute value thereof is greater than 2). Although applicable, it is preferable that Δε is negative and the absolute value thereof is larger than 3.

In the general formulas (N-1), (N-2) and (N-3), R ^N11 , R ^N12 , R ^N21 , R ^N22 , R ^N31 and R ^N32 each independently represent 1 to 8 carbon atoms. An alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms, preferably an alkyl group having 1 to 5 carbon atoms, An alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms is preferable, and an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms is preferable. More preferably, an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 3 carbon atoms is more preferable, and an alkenyl group having 3 carbon atoms (propenyl group) is particularly preferable. In particular, by using a combination of a compound in which at least one of R ^N11 and R ^N12 represents an alkenyl group and a compound represented by the general formula (I), a decrease in voltage holding ratio (VHR) is remarkably suppressed. be able to. Similarly, by using a compound in which at least one of R ^N21 and R ^N22 represents an alkenyl group and a compound represented by the general formula (I) in combination, a decrease in voltage holding ratio (VHR) is remarkably suppressed. In addition, by using a combination of a compound in which at least one of R ^N31 and R ^N32 represents an alkenyl group and a compound represented by the general formula (I), the voltage holding ratio (VHR) is decreased. Can be remarkably suppressed.

The alkenyl group is preferably selected from groups represented by any of the formulas (R1) to (R5). (The black dots in each formula represent carbon atoms in the ring structure.)

A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31, and A ^N32 are preferably aromatic when it is required to increase Δn independently, and in order to improve the response speed, fat Preferably a trans-1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5 -Difluoro-1,4-phenylene group, 2,3-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1 , 4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group Preferred, it is more preferable that represents the following structures,

More preferably, it represents a trans-1,4-cyclohexylene group or a 1,4-phenylene group.

^{^{^{^{Z N11, Z N12, Z N21}}}} , Z N22, Z N31 and ^{Z N32} _-CH 2 each _{independently} _{O -, - CF 2 O -} , - CH 2 CH 2 -, - CF 2 CF 2 - or a single bond preferably represents _{_{an, -CH 2 O -, - CH}} 2 CH 2 - or a single bond is more preferable, _-CH 2 O-or a single bond is particularly preferred.

^XN21 is preferably a fluorine atom.

T ^N31 is preferably an oxygen atom.

n ^N11 + n ^N12 , n ^N21 + n ^N22 and n ^N31 + n ^N32 are preferably 1 or 2, a combination in which n ^N11 is 1 and n ^N12 is 0, a combination in which n ^N11 is 2 and n ^N12 is 0, n ^A combination in which ^N11 is 1 and n ^N12 is 1, a combination in which n ^N11 is 2 and n ^N12 is 1, a combination in which n ^N21 is 1 and n ^N22 is 0, n ^N21 is 2 and n ^N22 is n A combination in which n ^N31 is 1 and n ^N32 is 0, and a combination in which n ^N31 is 2 and n ^N32 is 0 are preferable.

The lower limit of the preferable content of the compound represented by the formula (N-1) with respect to the total amount of the composition of the present invention is 0%, 1%, 10%, 20% 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, 25%, 20% It is.

The lower limit of the preferable content of the compound represented by the formula (N-2) with respect to the total amount of the composition of the present invention is 0%, 1%, 10%, 20% 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, 25%, 20% It is.

The lower limit of the preferable content of the compound represented by the formula (N-3) with respect to the total amount of the composition of the present invention is 0%, 1%, 10%, 20% 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, 25%, 20% It is.

When the viscosity of the composition of the present invention is kept low and a composition having a high response speed is required, the above lower limit value is preferably low and the upper limit value is preferably low. Furthermore, when the composition of the present invention keeps Tni high and a composition having good temperature stability is required, the above lower limit value is preferably low and the upper limit value is preferably low. When it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the above lower limit value is increased and the upper limit value is high.

The liquid crystal composition of the present invention preferably contains one or more compounds represented by general formula (i-1) as general formula (N-1).

(In the formula, A ⁱ¹¹ , A ⁱ¹² and A ⁱ¹³ each independently represents a 1,4-cyclohexylene group or a 1,4-phenylene group, but one existing in the 1,4-cyclohexylene group) of -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O- or -S-, it is one of the hydrogen atoms present in the 1,4-phenylene group, respectively Independently substituted with a fluorine atom or a chlorine atom, Z ⁱ¹ represents —OCH ₂ —, —CH ₂ O—, —CF ₂ O—, —OCF ₂ —, —CH ₂ CH ₂ — or —CF ₂ CF ₂ - ^{represents, m i11} and ^{m i12} are each independently 0 or ^{^1, R} ^N11, R ^N12 and ^{Z N12} ^{is, ^R} N11, ^R ^N12 and in the general formula (N-1) each independently Z represents the same meaning as ^N12 .)
The compound represented by general formula (i-1) is preferably a compound represented by general formula (i-1A), general formula (i-1B) or general formula (i-1C).

(Wherein, R ^N11 , R ^N12 , A ⁱ¹¹ and Z ⁱ¹ each independently represent the same meaning as R ^N11 , R ^N12 , A ⁱ¹¹ and Z ⁱ¹ in formula (i-1)).

^(Wherein, ^{^{R N11, R N12, A i11}} , A i12 and ^{Z i1} are the same meaning as ^{^{^{R N11, R N12, A i11}}} , A i12 and ^{Z i1} in the general formula (i1) independently To express.)

(In the formula, m ⁱ¹³ represents 1, and R ^N11 , R ^N12 , A ⁱ¹¹ , A ⁱ¹² , A ⁱ¹³ , Z ⁱ¹ , Z ⁱ² and m ⁱ¹¹ are each independently R ^N11 in the general formula (i-1). , R ^N12 , A ⁱ¹¹ , A ⁱ¹² , A ⁱ¹³ , Z ⁱ¹ , Z ⁱ² and m ⁱ¹¹ represent the same meaning.)
As the compound represented by the general formula (i-1A), compounds represented by the following general formula (i-1A-1) to general formula (i-1A-4) are preferable.

(Wherein, R ^N11 and R ^N12 each independently represent the same meaning as R ^N11 and R ^N12 in formula (i-1)).
The compound represented by the general formula (i-1B) is preferably a compound represented by the following general formula (i-1B-1) to general formula (i-1B-7).

(In the formula, R ^N11 and R ^N122 each independently represent the same meaning as R ^N11 and R ^N12 in formula (i-1).)
The compound represented by the general formula (i-1C) is preferably a compound represented by the following general formula (i-1C-1) to general formula (i-1C-4). -1C-1) and a compound represented by the general formula (i-1C-2) are more preferable.

(Wherein, R ^N11 and R ^N122 each independently represent the same meaning as R ⁱ¹ and R ⁱ² in formula (i-1)).
The liquid crystal composition of the present invention preferably contains one or more compounds represented by the general formula (i), but the general formula (i-1A), the general formula (i-1B) or the general formula One or more compounds selected from the group of compounds represented by (i-1C) may be contained, or represented by the general formula (i-1A), general formula (i-1B), or general formula (i One or more compounds each represented by -1C) may be contained. One or more compounds represented by general formula (i-1A) and general formula (i-1B) are preferably contained, and more preferably 2 to 10 compounds are contained.

More specifically, general formula (i-1A), general formula (i-1B) and general formula (i-1C) are represented by general formula (i-1A-1), general formula (i-1B-1) and general formula (i-1B-1). It is preferable to contain one or more compounds selected from the compound group represented by the formula (i-1C-1), and the compound represented by the general formula (i-1A-1) and the general formula (i The combination of the compounds represented by -1B-1) is more preferable.

The liquid crystal composition of the present invention preferably contains one or more compounds represented by general formula (ii) as general formula (LC3).

(In the formula, A ⁱⁱ¹ and A ⁱⁱ² each independently represent 1,4-cyclohexylene group or 1,4-phenylene group, but one —CH existing in 1,4-cyclohexylene group) ₂ — or two or more non-adjacent —CH ₂ — may be replaced by —O— or —S—, and one hydrogen atom present in the 1,4-phenylene group is each independently may be substituted by a fluorine atom or a chlorine ^{atom, m ii1} and ^{m ii2} independently represents 1 or ^{2, R N11} and ^{R N12} is, ^{R N11} and in the general formula (N-1) each independently represent the same meaning as R ^N12.)
As general formula (ii-1), it is preferable to contain one or more compounds represented by general formula (ii-1).

^(Wherein, it represents the same meaning as R ^{^N11,} R ^N12, ^{A ii1} and ^{m ii1} is ^R N11 in the general formula ^{^{(ii), R N12, A}} ii1 and ^{m ii1.)}
The compound represented by the general formula (ii-1) is preferably a compound represented by the general formula (II-2A) or the general formula (II-2B).

^{^(Wherein, R} ^N11, R ^N12 and ^{A ii1} have the same meanings as ^R ^{N11, R N12} and ^{A ii1} in formula (ii).)

(In the formula, A ⁱⁱ¹¹ and A ⁱⁱ¹¹ each independently represents a 1,4-cyclohexylene group or a 1,4-phenylene group, but one —CH existing in the 1,4-cyclohexylene group) ₂ — or two or more non-adjacent —CH ₂ — may be replaced by —O— or —S—, and one hydrogen atom present in the 1,4-phenylene group is each independently (It may be substituted with a fluorine atom or a chlorine atom, and R ^N11 and R ^N12 represent the same meaning as R ^N11 and R ^N12 in formula (ii).)
As the compound represented by the general formula (ii-1A), compounds represented by the following general formula (ii-1A-1) and general formula (ii-1A-2) are preferable.

^{(Wherein, R N11} and ^{R N12} are the same as defined ^{R N11} and ^{R N12} in the general formula (ii).)
The compound represented by the general formula (ii-1B) is preferably a compound represented by the following general formula (ii-1B-1) to general formula (ii-1B-3).

^{(Wherein, R N11} and ^{R N12} are the same as defined ^{R N11} and ^{R N12} in the general formula (ii).)
The liquid crystal composition of the present invention preferably contains one or more compounds represented by general formula (ii), but is represented by general formula (ii-1A) and general formula (ii-1B). 1 or 2 or more types of compounds selected from the group of compounds described above may be included, or each of the compounds represented by general formula (ii-1A) and general formula (ii-1B) may be included. Also good. It is preferable to contain 2 to 10 compounds represented by general formula (ii-1A) and general formula (ii-1B).

More specifically, the general formula (ii-1A) preferably contains one or more compounds selected from the compound group represented by the general formula (ii-1A-1). 1B) preferably contains one or more compounds selected from the group of compounds represented by general formula (ii-1B-1) and general formula (ii-1B-2). A combination of the compounds represented by 1A-1) and the general formula (ii-1B-1) is more preferable.

In addition, it is preferable to contain one or more compounds represented by the following general formula (LC3-b) as the general formula (N-1).

(In the formula, R ^N11 , R ^N12 , A ^N11 , A ^N12 and Z ^N11 are each independently the same meaning as R ^N11 , R ^N12 , A ^N11 , A ^N12 and Z ^{N11 in} the general formula (N-1). X ^LC3b1 to X ^LC3b4 ^each represent a hydrogen atom or a fluorine atom, but at least one of X ^LC3b1 and X ^LC3b2 , or at least one of X ^LC3b3 and X ^LC3b4 represents a fluorine atom, and m ^LC3b1 represents 0 or 1 (However, in general formula (LC3-b), the compounds represented by general formula (i-1) and general formula (ii) are excluded.)
The general formula (LC3-b) preferably represents the following general formula (LC3-b1) to general formula (LC3-b10).

(Wherein, R ^N11 and R ^N12 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1)).
The combination of R ^N11 and R ^N12 is not particularly limited, but both represent an alkyl group, both represent an alkenyl group, one represents an alkyl group, the other represents an alkenyl group, and either one represents It is preferable that one represents an alkyl group, the other represents alkoxy, and one represents an alkyl group and the other represents an alkenyloxy group, both represent an alkyl group, and both represent an alkenyl group. It is more preferable that it represents.

Further, the general formula (LC3-b) preferably represents the following general formula (LC3-c).

(Wherein, R ^N11 and R ^N12 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1)).
The compound represented by the general formula (N-2) is preferably a compound selected from the group of compounds represented by the general formulas (N-2-1) to (N-2-3).

(In the formula, R ^N211 and R ^N22 each independently represent the same meaning as R ^N211 and R ^N22 in formula (N-2).)
The compound represented by the general formula (N-3) is preferably a compound selected from the group of compounds represented by the general formulas (N-3-1) and (N-3-2).

The compound represented by the general formula (N-3-1) is the following compound.

(In the formula, R ^N31 and R ^N32 each independently represent the same meaning as R ^N31 and R ^N32 in formula (N-3).)
<Third Aspect of Compound Represented by General Formula (II)>
The fourth component is a so-called nonpolar liquid crystal compound having a dielectric anisotropy of about 0, and examples thereof include compounds represented by the following general formula (L).

The composition of the present invention preferably contains one or more compounds represented by the general formula (L). The compound represented by the general formula (L) corresponds to a dielectrically neutral compound (Δε value is −2 to 2).

(Wherein R ^L1 and R ^L2 each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently Optionally substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^L1 represents 0, 1, 2 or 3,
A ^L1 , A ^L2 and A ^L3 each independently represent (a) a 1,4-cyclohexylene group (one —CH ₂ — present in the group or two or more —CH ₂ — not adjacent to each other). May be replaced by -O-.)
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or 1,2 , 3,4-tetrahydronaphthalene-2,6-diyl group, one —CH═ or two or more non-adjacent —CH═ may be replaced by —N═.
The group (a), the group (b) and the group (c) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^L1 and Z ^L2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —OCF ₂ -, -CF ₂ O-, -CH = NN-CH-, -CH = CH-, -CF = CF- or -C≡C-
When n ^L1 is 2 or 3, and a plurality of A ^L2 are present, they may be the same or different, and when n ^L1 is 2 or 3, and a plurality of Z ^L3 are present, May be the same or different, but excludes compounds represented by general formula (J), general formula (N-1), general formula (N-2) and general formula (N-3). )
Although the compound represented by general formula (L) may be used independently, it can also be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to desired properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Alternatively, in another embodiment of the present invention, there are two types, three types, four types, five types, six types, seven types, eight types, nine types, 10 types, More than types.

In the composition of the present invention, the content of the compound represented by the general formula (L) is low-temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, It is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the formula (L) with respect to the total amount of the composition of the present invention is 0%, 1%, 10%, 20%, 30 %, 40%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%. The upper limit of the preferable content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, and 25%.

When the viscosity of the composition of the present invention is kept low and a composition having a high response speed is required, the above lower limit value is preferably high and the upper limit value is preferably high. Furthermore, when the composition of the present invention maintains a high Tni and requires a composition having good temperature stability, the above lower limit value is preferably high and the upper limit value is preferably high. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the above lower limit value is lowered and the upper limit value is low.

When importance is attached to reliability, R ^L1 and R ^L2 are preferably both alkyl groups, and when importance is placed on reducing the volatility of the compound, it is preferably an alkoxy group, and importance is placed on viscosity reduction. In this case, at least one is preferably an alkenyl group.

R ^L1 and R ^L2 are each a linear alkyl group having 1 to 5 carbon atoms or a linear alkyl group having 1 to 4 carbon atoms when the ring structure to which R ^L1 is bonded is a phenyl group (aromatic). When the ring structure to which it is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a straight-chain C 1-5 carbon atom is preferred. Alkyl groups, linear alkoxy groups having 1 to 4 carbon atoms and linear alkenyl groups having 2 to 5 carbon atoms are preferred. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and is preferably linear.

In particular, by using a combination of a compound in which at least one of R ^L1 and R ^L2 represents an alkenyl group and a compound represented by the general formula (I), a decrease in voltage holding ratio (VHR) is remarkably suppressed. be able to.

n ^L1 is preferably 0 when importance is attached to the response speed, 2 or 3 is preferred for improving the upper limit temperature of the nematic phase, and 1 is preferred for balancing these. In order to satisfy the properties required for the composition, it is preferable to combine compounds having different values.

A ^L1 , A ^L2, and A ^L3 are preferably aromatic when it is required to increase Δn, and are preferably aliphatic for improving the response speed, and are each independently trans- 1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6 -It preferably represents a diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and more preferably represents the following structure:

Z ^L1 and Z ^L2 are preferably single bonds when the response speed is important.

The number of halogen atoms in the molecule is preferably 0 or 1.

The compound represented by the general formula (L) is preferably a compound selected from the compounds represented by the general formula (L-1).

(In the formula, R ^L1 and R ^L2 each independently represent the same meaning as R ^L1 and R ^L2 in General Formula (L).)
R ^L11 and R ^L12 are preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and a linear alkenyl group having 2 to 5 carbon atoms. . The compound represented by the general formula (L-1) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

The lower limit of the preferable content is 1%, 2%, 3%, 5%, 7%, 10%, and 15% with respect to the total amount of the composition of the present invention. %, 20%, 25%, 30%, 35%, 40%, 45%, 50%, and 55%. The upper limit of the preferable content is 95%, 90%, 85%, 80%, 75%, 70%, 65%, based on the total amount of the composition of the present invention. %, 60%, 55%, 50%, 45%, 40%, 35%, 30%, 25%.

When the viscosity of the composition of the present invention is kept low and a composition having a high response speed is required, the above lower limit value is preferably high and the upper limit value is preferably high. Furthermore, when the composition of the present invention requires a high Tni and a composition having good temperature stability, it is preferable that the lower limit value is moderate and the upper limit value is moderate. When it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the lower limit value is low and the upper limit value is low.

The compound represented by the general formula (L-1) is preferably a compound represented by the general formula (L-1-1).

^{(Wherein, R L11} represents a hydrogen atom or a methyl ^{group, R L2} represents the same meaning as ^{R L2} in Formula (L).)
The compound represented by the general formula (L-1-1) is a compound selected from the group of compounds represented by the formula (L-1-1.11) to the formula (L-1-1.13). And is preferably a compound represented by formula (L-1-1.12) or formula (L-1-1.13), and particularly represented by formula (L-1-1.13). It is preferable that it is a compound.

Further, the compound represented by the general formula (L-1-1) is a compound selected from the group of compounds represented by the formula (L-1-1.21) to the formula (L-1-1.24). It is preferable that the compound be a compound represented by the formula (L-1-1.22) to the formula (L-1-1.24). In particular, the compound represented by the formula (L-1-1.22) is preferable because the response speed of the composition of the present invention is particularly improved. When obtaining Tni higher than the response speed, it is preferable to use a compound represented by formula (L-1-1.23) or formula (L-1-1.24).

The compound represented by the general formula (L-1-1) is a compound selected from the group of compounds represented by the formula (L-1-1.31) and the formula (L-1-1.41). Preferably there is.

The compound represented by the general formula (L-1) is preferably a compound represented by the general formula (L-1-2).

(Wherein R ¹²¹ and R ¹²² each independently represents an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms.)
The compound represented by the general formula (L-1-2) is a compound selected from the group of compounds represented by the formula (L-1-2.1) to the formula (L-1-2.12). Are preferred, and compounds represented by formula (L-1-2.1), formula (L-1-2.3) or formula (L-1-2.4) are preferred. In particular, the compound represented by the formula (L-1-2.1) is preferable because the response speed of the composition of the present invention is particularly improved. Further, when obtaining Tni higher than the response speed, the equation (L-1-2.3), the equation (L-1-2.4), the equation (L-1-2.11), and the equation (L− It is preferable to use a compound represented by 1-2.12). Sum of compounds represented by formula (L-1-2.3), formula (L-1-2.4), formula (L-1-2.11) and formula (L-1-2.12) The content of is not preferably 20% or more in order to improve the solubility at low temperatures.

The compound represented by the general formula (L-1) is preferably a compound selected from the group of compounds represented by the general formula (L-1-3) and / or (L-1-4). .

(In the formula, R ⁱⁱ³¹ and R ⁱⁱ⁴¹ each independently represent the same meaning as R ⁱⁱ² in the general formula (L).)
The compound represented by the general formula (L) is preferably a compound represented by the following general formula (L-2) to general formula (L-11). The liquid crystal composition of the present invention contains one or more compounds represented by general formula (L-2) to general formula (L-11) as the compound represented by general formula (L). Is preferred.

(Wherein R ^L31 and R ^L32 are an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, R ^L32 is an alkyl group having 1 to 5 carbon atoms, and 1 to C atoms) 5 represents an alkoxyl group, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms.)
The compound represented by general formula (L) is a compound selected from general formula (L-4), general formula (L-6), general formula (L-7), and general formula (L-8). It is more preferable that the compound is selected from the general formula (L-6), the general formula (L-7), and the general formula (L-8), and the general formula (L-7) and the general formula (L- The compound selected from 8) is more preferable, and the compound selected from General Formula (L-6) and General Formula (L-8) is also preferable. More specifically, when a large Δn is required, a compound selected from general formula (L-6), general formula (L-8), and general formula (L-11) is preferable.
In the compounds represented by general formula (L-4), general formula (L-7), and general formula (L-8), R ^L31 represents an alkyl group having 1 to 5 carbon atoms or 2 carbon atoms. 5 alkenyl group having, preferably R ^L32 is an alkoxy group having 5 alkyl group or a carbon number of 1 1 to 5 carbon atoms, that R ^L31 is an alkenyl group having 2 to 5 carbon atoms More preferably, it is more preferably an alkenyl group having 2 or 3 carbon atoms. In the compound represented by the general formula (L-6), R ^L31 and R ^L32 each independently represent 1 to 5 carbon atoms. And an alkenyl group having 2 to 5 carbon atoms.

In addition, the compound represented by the general formula (L) contains one or more compounds represented by the general formula (L-12), the general formula (L-13), or the general formula (L-14). It is also preferable to do.

(Expressed in the ^{formula, R L51} and ^{R L52} are each independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group or an alkoxy group having 1 to 4 carbon atoms carbon atoms 2 to ^{5 X L51} and X ^L52 each independently represents a fluorine atom or a hydrogen atom, and one of X ^L51 and X ^L52 is a fluorine atom, and the other is a hydrogen atom.)
In addition, the compound represented by the general formula (L) may contain one or more compounds represented by the general formula (L-16.1) to the general formula (L-16.3). .

Further, the compound represented by the general formula (L) may contain one or more compounds represented by the general formula (N-001).

Wherein R ^N1 and R ^N2 are each independently an alkyl group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or 2 to 8 carbon atoms. L ¹ and L ² each independently represents a hydrogen atom, a fluorine atom, CH ₃ or CF ₃ (except that both L ¹ and L ² represent a fluorine atom).
R ^N1 and R ^N2 preferably represent an alkyl group having 1 to 5 carbon atoms.

The liquid crystal composition of the present invention preferably has a positive dielectric anisotropy (Δε) at 25 ° C., and the dielectric anisotropy (Δε) at 25 ° C. is 1.5 to 20.0. Preferably, 1.5 to 18.0 is more preferable, 1.5 to 15.0 is more preferable, 1.5 to 11 is more preferable, and 1.5 to 8 is particularly preferable. Dielectric anisotropy (Δε The liquid crystal composition having a positive value preferably contains a compound represented by the general formula (J) and a compound represented by the general formula (L). More specifically, it preferably contains a compound represented by the general formula (M) and a compound represented by the general formula (L-1), and the general formula (M-1) and / or the general formula (M -2) and a compound represented by the general formula (L-1-1).

In the liquid crystal composition of the present invention, the total content of the compound represented by the general formula (I), the compound represented by the general formula (J), and the compound represented by the general formula (L) The lower limit is preferably 5% or more, preferably 80% or more, preferably 85% or more, preferably 88% or more, preferably 90% or more, It is preferable to contain 92% or more, preferably 95% or more, preferably 97% or more, preferably 98% or more, preferably 99% or more. It is preferable not to contain a compound. Further, the upper limit value is preferably 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. Preferably not. The term “substantially” means that an unintentionally contained compound such as impurities inevitably generated during production is excluded.

In the liquid crystal composition of the present invention, the total content of the compound represented by the general formula (I), the compound represented by the general formula (M) and the compound represented by the general formula (L) The lower limit is preferably 5% or more, preferably 80% or more, preferably 85% or more, preferably 88% or more, preferably 90% or more, It is preferable to contain 92% or more, preferably 95% or more, preferably 97% or more, preferably 98% or more, preferably 99% or more. It is preferable not to contain a compound. Further, the upper limit value is preferably 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. Preferably not.

The liquid crystal composition of the present invention has a total content of the compound represented by the general formula (I), the compound represented by the general formula (J) and the compound represented by the general formula (L-1). The lower limit of the content is preferably 5% or more, preferably 10% or more, preferably 13% or more, preferably 15% or more, and 18% or more. Preferably, 20% or more is contained, preferably 23% or more, preferably 25% or more, preferably 28% or more, preferably 30% or more, 33% or more It is preferable to contain, it is preferable to contain 35% or more, it is preferable to contain 38% or more, and it is preferable to contain 40% or more. Further, the upper limit value is preferably 95% or less, preferably 90% or less, preferably 88% or less, preferably 85% or less, and preferably 83% or less. 80% or less, preferably 78% or less, preferably 75% or less, preferably 73% or less, preferably 70% or less, preferably 68% or less Preferably 65% or less, preferably 63% or less, preferably 60% or less, preferably 55% or less, preferably 50% or less, It is preferable to contain 40% or less.

The liquid crystal composition of the present invention preferably has a negative dielectric anisotropy (Δε) at 25 ° C., and the dielectric anisotropy (Δε) at 25 ° C. is from −2.0 to −8.0. -2.0 to -6.0 is preferred, -2.0 to -5.0 is more preferred, and -2.5 to -4.0 is particularly preferred.

Liquid crystal compositions having a negative dielectric anisotropy (Δε) include compounds represented by general formulas (N-1) to (N-3) and compounds represented by general formula (L). It is preferable to contain. More specifically, it preferably contains a compound represented by the general formula (N-1) and a compound represented by the general formula (L-1), and the compound represented by the general formula (N-1) And a compound represented by the general formula (L-1-1).

The liquid crystal composition of the present invention includes a compound represented by general formula (I), a compound represented by general formula (N-1) to general formula (N-3), and a compound represented by general formula (L). The total content is preferably 5% or more, preferably 80% or more, preferably 85% or more, and preferably 88% or more as the lower limit in the composition. 90% or more, preferably 92% or more, preferably 95% or more, preferably 97% or more, preferably 98% or more, 99% or more It is preferable to contain substantially no other compound. Further, the upper limit value is preferably 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. Preferably not.

The liquid crystal composition of the present invention has a total content of the compound represented by the general formula (I), the compound represented by the general formula (N-1) and the compound represented by the general formula (L). The lower limit is preferably 5% or more, preferably 80% or more, preferably 85% or more, preferably 88% or more, and 90% or more. Preferably, it contains 92% or more, preferably 95% or more, preferably 97% or more, preferably 98% or more, preferably 99% or more, substantially It is preferable not to contain other compounds. Further, the upper limit value is preferably 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. Preferably not.

The liquid crystal composition of the present invention has a refractive index anisotropy (Δn) at 25 ° C. of 0.08 to 0.14, more preferably 0.09 to 0.13, and 0.09 to 0.12. Particularly preferred. More specifically, it is preferably 0.10 to 0.13 when dealing with a thin cell gap, and preferably 0.08 to 0.10 when dealing with a thick cell gap.

The liquid crystal composition of the present invention has a viscosity (η) at 25 ° C. of 10 to 50 mPa · s, more preferably 10 to 40 mPa · s, and particularly preferably 10 to 35 mPa · s.

The liquid crystal composition of the present invention has a rotational viscosity (γ ₁ ) at 25 ° C. of 60 to 130 mPa · s, more preferably 60 to 110 mPa · s, and particularly preferably 60 to 100 mPa · s. .

The liquid crystal composition of the present invention has a nematic phase-isotropic liquid phase transition temperature (T _ni ) of 60 ° C. to 120 ° C., more preferably 70 ° C. to 100 ° C., and particularly preferably 70 ° C. to 85 ° C.

The liquid crystal composition of the present invention may contain a normal nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal, an antioxidant, or a polymerizable monomer in addition to the above-described compounds.

For example, the liquid crystal composition of the present invention may contain a liquid crystal compound having a dielectric anisotropy (Δε) at 25 ° C. of +2.0 to +50.0 as a normal nematic liquid crystal or smectic liquid crystal. The content is 0% to 50% by mass, preferably 1% to 30% by mass, preferably 3% to 30% by mass, and 5% to 20% by mass. Is preferred.

For example, the liquid crystal composition may contain 0.01 to 2% by mass of a polymerizable compound such as a biphenyl derivative or a terphenyl derivative as a polymerizable monomer.

As the polymerizable monomer, one or two kinds of monofunctional polymerizable compounds having one reactive group and polyfunctional polymerizable compounds having two or more reactive groups such as bifunctional or trifunctional You may contain above. The polymerizable compound having a reactive group may or may not contain a mesogenic moiety.

In the polymerizable compound having a reactive group, the reactive group is preferably a substituent having photopolymerizability.

Among the polymerizable compounds having a reactive group, specifically, as the polymerizable compound having a monofunctional reactive group, the following general formula (VI)

(Wherein X ³ represents a hydrogen atom or a methyl group, Sp ³ represents a single bond, an alkylene group having 1 to 8 carbon atoms, or —O— (CH ₂ ) _t — (wherein t is 2 to And an oxygen atom is bonded to an aromatic ring. V represents a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a polyvalent cyclic group having 5 to 30 carbon atoms. The alkylene group in the polyvalent alkylene group may be substituted with an oxygen atom in the range where the oxygen atom is not adjacent to each other, and the alkyl group having 5 to 20 carbon atoms (the alkylene group in the group is an oxygen atom) May be substituted with an oxygen atom in a range not adjacent to each other)) or may be substituted with a cyclic substituent, and W represents a hydrogen atom, a halogen atom or an alkylene group having 1 to 8 carbon atoms). The polymerizable compound represented is preferred.

In the general formula (VI), X ³ represents a hydrogen atom or a methyl group. However, when importance is attached to the reaction rate, a hydrogen atom is preferred, and when importance is placed on reducing the residual amount of reaction, a methyl group is preferred. preferable.

In the general formula (VI), Sp ³ represents a single bond, an alkylene group having 1 to 8 carbon atoms, or —O— (CH ₂ ) _t — (wherein _t represents an integer of 2 to 7, Represents a bond to an aromatic ring, but the carbon chain is preferably not so long, a single bond or an alkylene group having 1 to 5 carbon atoms is preferable, and a single bond or 1 to 3 carbon atoms is preferable. An alkylene group is more preferred. Further, when Sp ³ represents —O— (CH ₂ ) _t —, t is preferably 1 to 5, and more preferably 1 to 3.

In the general formula (VI), V represents a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a polyvalent cyclic substituent having 5 to 30 carbon atoms, and an alkylene group in the polyvalent alkylene group. May be substituted with an oxygen atom in the range where the oxygen atom is not adjacent, and an alkyl group having 5 to 20 carbon atoms (the alkylene group in the group may be substituted with an oxygen atom within the range where the oxygen atom is not adjacent) .) Or may be substituted with a cyclic substituent, and is preferably substituted with two or more cyclic substituents.

More specifically, the polymerizable compound represented by the general formula (VI) is represented by the general formula (X1a).

(In the formula, A ¹ represents a hydrogen atom or a methyl group,
A ² represents a single bond or an alkylene group having 1 to 8 carbon atoms (one or two or more methylene groups in the alkylene group are each independently an oxygen atom, assuming that oxygen atoms are not directly bonded to each other, -CO-, -COO- or -OCO- may be substituted, and one or more hydrogen atoms in the alkylene group are each independently substituted with a fluorine atom, a methyl group or an ethyl group. May be)
A ³ and A ⁶ are each independently a hydrogen atom, a halogen atom or an alkyl group having 1 to 10 carbon atoms (one or two or more methylene groups in the alkyl group are such that oxygen atoms are not directly bonded to each other) And each independently may be substituted with an oxygen atom, —CO—, —COO— or —OCO—, and one or more hydrogen atoms in the alkyl group are each independently a halogen atom. Which may be substituted with an atom or an alkyl group having 1 to 17 carbon atoms).
A ⁴ and A ⁷ are each independently a hydrogen atom, a halogen atom, or an alkyl group having 1 to 10 carbon atoms (one or two or more methylene groups in the alkyl group are such that oxygen atoms are not directly bonded to each other) And each independently may be substituted with an oxygen atom, —CO—, —COO— or —OCO—, and one or more hydrogen atoms in the alkyl group are each independently a halogen atom. Which may be substituted with an atom or an alkyl group having 1 to 9 carbon atoms).
p represents 1 to 10,
B ¹ , B ² and B ³ are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 10 carbon atoms (one or two or more methylene groups in the alkyl group are In addition, as the oxygen atoms are not directly bonded to each other, each may be independently substituted with an oxygen atom, —CO—, —COO— or —OCO—, and one or more of the alkyl groups may be substituted. And each of the hydrogen atoms may be independently substituted with a halogen atom or a trialkoxysilyl group having 3 to 6 carbon atoms.

Further, the polymerizable compound represented by the general formula (VI) is specifically the general formula (X1b).

(Wherein A ⁸ represents a hydrogen atom or a methyl group,
6-membered rings T ¹ , T ² and T ³ are each independently

(Where q represents an integer of 1 to 4),
q represents 0 or 1,
Y ¹ and Y ² are each independently a single bond, —CH ₂ CH ₂ —, —CH ₂ O—, —OCH ₂ —, —COO—, —OCO—, —C≡C—, —CH═CH—. , —CF═CF—, — (CH ₂ ) ₄ —, —CH ₂ CH ₂ CH ₂ O—, —OCH ₂ CH ₂ CH ₂ —, —CH ₂ ═CHCH ₂ CH ₂ — or —CH ₂ CH ₂ CH = CH-
Y ³ represents a single bond, —COO— or —OCO—,
B ⁸ represents a hydrocarbon group having 1 to 18 carbon atoms. And a compound represented by

Furthermore, the polymerizable compound represented by the general formula (VI) is specifically the general formula (X1c).

(Wherein R ⁷⁰ represents a hydrogen atom or a methyl group, and R ⁷¹ represents a hydrocarbon group having a condensed ring).

In addition, among the polymerizable compounds having a reactive group, the polymerizable compound having a polyfunctional reactive group is represented by the following general formula (VII).

(Wherein X ¹ and X ² each independently represent a hydrogen atom or a methyl group, and Sp ¹ and Sp ² each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms or —O— (CH ₂ ) _s — (wherein _s represents an integer of 2 to 7 and an oxygen atom is bonded to an aromatic ring), and U is a linear or branched chain having 2 to 20 carbon atoms Represents a valent alkylene group or a polyvalent cyclic substituent having 5 to 30 carbon atoms, and the alkylene group in the polyvalent alkylene group may be substituted with an oxygen atom within a range in which the oxygen atom is not adjacent to each other. May be substituted with an alkyl group of ˜20 (the alkylene group in the group may be substituted with an oxygen atom in the range where the oxygen atom is not adjacent) or a cyclic substituent, and k is an integer of 1 to 5 The polymerizable compound represented by .
In the general formula (VII), X ¹ and X ² each independently represent a hydrogen atom or a methyl group. However, when importance is attached to the reaction rate, a hydrogen atom is preferable, and importance is placed on reducing the reaction residual amount. In this case, a methyl group is preferred.

In the general formula (VII), Sp ¹ and Sp ² are each independently a single bond, an alkylene group having 1 to 8 carbon atoms, or —O— (CH ₂ ) _s — (wherein s is 2 to 7 Wherein the oxygen atom is bonded to the aromatic ring), the carbon chain is preferably not so long, a single bond or an alkylene group having 1 to 5 carbon atoms is preferable, and a single bond or An alkylene group having 1 to 3 carbon atoms is more preferred. Also, when Sp ¹ and Sp ² represent —O— (CH ₂ ) _s —, s is preferably 1 to 5, more preferably 1 to 3, and at least one of Sp ¹ and Sp ² is a single bond. More preferably, it is particularly preferable that both are single bonds.

In the general formula (VII), U represents a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a polyvalent cyclic substituent having 5 to 30 carbon atoms, and an alkylene group in the polyvalent alkylene group May be substituted with an oxygen atom in the range where the oxygen atom is not adjacent, and an alkyl group having 5 to 20 carbon atoms (the alkylene group in the group may be substituted with an oxygen atom within the range where the oxygen atom is not adjacent) ), May be substituted with a cyclic substituent, and is preferably substituted with two or more cyclic substituents.

In the general formula (VII), U specifically preferably represents the following formulas (VII-1) to (VII-5), and the formulas (VII-1) to (VII-3) It is more preferable to represent, and it is particularly preferable to represent the formula (VII-1).

(In the formula, both ends shall be bonded to Sp ¹ or Sp ^2. )
When U has a ring structure, at least one of the Sp ¹ and Sp ² preferably represents a single bond, and it is also preferable that both are single bonds.

In the general formula (VII), k represents an integer of 1 to 5, and k is preferably a bifunctional compound having 1 or a trifunctional compound having k being 2, and more preferably a bifunctional compound. .

More specifically, the general formula (P)

It is preferable to contain 1 type, or 2 or more types of the polymeric compound represented by these.

In the general formula (P), X ²⁰¹ and X ²⁰² each independently represent a hydrogen atom, a methyl group, or a —CF ₃ group. X ²⁰¹ and X ²⁰² are each preferably a diacrylate derivative that is a hydrogen atom, and a dimethacrylate derivative that is both a methyl group, and a compound in which one is a hydrogen atom and the other is a methyl group. A preferred compound can be used depending on the application, but in the PSA display element, the polymerizable compound represented by the general formula (P) preferably has at least one methacrylate derivative, and preferably has two.

In the general formula (P), Sp ²⁰¹ and Sp ²⁰² each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms or —O— (CH ₂ ) _s — (wherein s is 2 to 7 And an oxygen atom is bonded to the ring. Sp ²⁰¹ and Sp ²⁰² are preferably at least one is a single bond in a PSA type liquid crystal display device, either a single bond compound or one is a single bond and the other is an alkylene having 1 to 8 carbon atoms. Group or —O— (CH ₂ ) _s —, in which case an alkylene group having 1 to 4 carbon atoms is preferred, and s is preferably 1 to 4.

In the general formula (P), M ²⁰¹ , M ²⁰² and M ²⁰³ each independently represents a trans-1,4-cyclohexylene group (one or non-adjacent two or more —CH ₂ — in the group represents Optionally substituted by —O— or —S—), 1,4-phenylene group (one or two or more non-adjacent —CH═ in the group may be substituted by —N═) 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene- Represents a 2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and each hydrogen atom in the group independently represents a fluorine atom, a —CF ₃ group, or a carbon atom number. 1 to 10 alkyl groups, 1 to 1 carbon atom It may be substituted by 0 alkoxyl group or any one of formulas (R-1) to (R-15).

In the general formula (P), Z ²⁰¹ and Z ²⁰² each independently represent —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —CF ₂ O—, —OCF ₂ —, — CH ₂ CH ₂ —, —CF ₂ CF ₂ —, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH ₂ CH ₂ —, —OCO—CH ₂ CH ₂ —, —CH ₂ CH ₂ —COO—, —CH ₂ CH ₂ —OCO—, —COO—CH ₂ —, —OCO—CH ₂ —, —CH ₂ —COO —, —CH ₂ —OCO—, —CY ¹ ═CY ² — (wherein Y ¹ and Y ² each independently represents a fluorine atom or a hydrogen atom), —C≡C— or a single bond Represents —COO—, —OCO—, —CH═CH—COO—, — H = CH-OCO -, - COO-CH = CH -, - OCO-CH = CH -, - COO-CH 2 CH 2 -, - OCO-CH 2 CH 2 -, - CH 2 CH 2 -COO-, —CH ₂ CH ₂ —OCO—, —C≡C— or a single bond is preferable, —COO—, —OCO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH _{_{-, - OCO-CH = CH}} -, - COO-CH 2 CH 2 -, - OCO-CH 2 CH 2 -, - CH 2 CH 2 -COO -, - CH 2 CH 2 -OCO- or a single bond is more preferable.

In the general formula (P), n ²⁰¹ represents 0, 1 or 2, and 0 or 1 is preferable. However, when there are a plurality of M ²⁰² and Z ²⁰² , they may be different or the same.

It may contain at least one polymerizable compound represented by formula (P), preferably 1 to 5 types, more preferably 1 to 3 types.
The content of the general formula (P) is preferably 0.01 to 2.00% by mass, more preferably 0.05 to 1.00% by mass, and 0.10 to 0.50% by mass. It is particularly preferred.

More specifically, when n ²⁰¹ is 0 in the general formula (P), the ring structure between Sp ²⁰¹ and Sp ²⁰² is preferably a formula (XXa-1) to a formula (XXa-5), The formula (XXa-1) to the formula (XXa-3) are more preferable, and the formula (XXa-1) or the formula (XXa-2) is particularly preferable. However, both ends of the equation shall be connected to Sp ²⁰¹ or Sp ²⁰² .

The polymerizable compound represented by the general formula (P) containing these skeletons is suitable for a PSA type liquid crystal display element because of its alignment regulating power after polymerization, and a good alignment state is obtained, thereby suppressing display unevenness. There is an effect that does not occur at all.

From the above, the polymerizable monomer is preferably a compound represented by the formula (XX-1) to the general formula (XX-10), more preferably the formula (XX-1) to the formula (XX-4).

In formula (XX-1) to general formula (XX-10), Sp ^xx represents an alkylene group having 1 to 8 carbon atoms or —O— (CH ₂ ) _s — (wherein s represents an integer of 2 to 7) And an oxygen atom is bonded to the ring).

In formula (XX-1) to general formula (XX-10), the hydrogen atom in the 1,4-phenylene group is further —F, —Cl, —CF ₃ , —CH ₃ , formula (R-1) To optionally substituted by any of formulas (R-15).

In the general formula (P), when n ²⁰¹ is 1, for example, a polymerizable compound such as the formula (P31) to the formula (P48) is preferable.

The hydrogen atoms in the 1,4-phenylene group and the naphthalene group in the formula (P31) to the formula (P48) are further represented by —F, —Cl, —CF ₃ , —CH ₃ , and a formula from the formula (R-1). It may be substituted by any of (R-15).

In the general formula (P), when n ²⁰¹ is 1 and there are a plurality of formulas (R-1) or (R-2), for example, a polymerizable compound such as formula (P301) to formula (P316) preferable.

The hydrogen atoms in the 1,4-phenylene group and naphthalene group in the formulas (P301) to (P316) may be further substituted with —F, —Cl, —CF ₃ , or —CH ₃ .

As the polymerizable compound represented by the general formula (P), for example, polymerizable compounds such as formula (Ia-1) to formula (Ia-31) are also preferable.

The liquid crystal display element using the liquid crystal composition of the present invention has no display defects or is suppressed and has excellent display quality and high response speed. Particularly, as an active matrix liquid crystal display element, for example, a TN type , OCB type, VA type, VA-IPS type, PSVA type, PSA type, FFS type, IPS type or ECB type. The PSVA type and the PSA type are substantially synonymous.

Furthermore, the liquid crystal composition of the present invention containing a polymerizable compound is a polymer-stabilized VA type prepared by polymerizing a polymerizable compound contained in the liquid crystal composition with or without voltage application, A liquid crystal display element such as a PSA type, a TN type, an OCB type, an ECB type, an IPS type, an FFS type, or a VA-IPS type can be provided.

EXAMPLES The present invention will be described in further detail with reference to examples below, but the present invention is not limited to these examples. Further, “%” in the compositions of the following Examples and Comparative Examples means “mass%”.
The following abbreviations are used for the description of compounds in the examples.
(Side chain)
-N -C _n H _{2n + 1} linear alkyl group having n carbon atoms n-C _n H _{2n + 1-} linear alkyl group having n carbon atoms -On -OC _n H _{2n + 1} linear alkoxy group having n carbon atoms Group nO— C _n H _{2n + 1} O— Linear alkoxy group having n carbon atoms —V ₂ —CH═CH ₂
V- CH ₂ = CH-
-V1 -CH = CH-CH ₃
1V- CH ₃ —CH═CH—
-2V -CH ₂ -CH ₂ -CH = CH ₂
V2- CH ₂ = CH-CH ₂ -CH _2-
-2V1 -CH ₂ -CH ₂ -CH = CH-CH ₃
1V2- CH ₃ —CH═CH—CH ₂ —CH ₂ —
(Linking group)
-CFFO- -CF ₂ -O-
-OCFF- -O-CF _2-
-1O- -CH ₂ -O-
-O1- -O-CH _2-
-COO- -COO-
-OCO- -OCO-
(Ring structure)

In the examples, the following compounds were used as additives.

In the examples and comparative examples, the following compounds were used as additives.

In the examples, the measured characteristics are as follows.

Fluorescence intensity: Prepare liquid crystal samples for various evaluations, and place 1 μL of the material with a pipette on the base of Thermo Scientific NANO Drop 3000 Fluorospectrometer (manufactured by Thermo Scientific). Close the sampling arm and use the sample as the liquid column. Irradiate with a 365 nm Blue LED light source and measure the fluorescence intensity of the sample.

VHR (UV): An evaluation cell into which a sample was introduced was annealed at 100 ° C. for 2 hours, and a voltage holding ratio (1 V, 5 Hz, 60 ° C.) after UV irradiation with a high-pressure mercury lamp (1 V, 5 Hz, 60 ° C.). 100 mW / cm ² .
(Examples 1 to 37, Comparative Examples 1 to 3)
The following composition (LC-A) was prepared.

The following LC-A liquid crystal composition was prepared, and its physical properties were measured. The composition of the liquid crystal composition and the results of its physical properties were as shown in the table.

With respect to 100 parts by mass of the liquid crystal composition LC-A, the above formula (A-1-1), formula (A-1-2), formula (A-1-3), formula (B-1), formula The compounds represented by (B-2) and formula (H-14) were added in the proportions shown in the following table, and the fluorescence intensity and VHR were measured. The results are shown below.

From Comparative Examples 1 to 3 and Examples 1 to 37, compounds represented by formulas (A-1-1), (A-1-2) and (A-1-3) (compounds corresponding to compound A) It turns out that fluorescence intensity can be reduced by containing at least any one of these. Examples 1 to 37 were confirmed to have a higher VHR (UV) than the comparative examples. Further, from Examples 3 to 10, 13 to 20, and 23 to 37, it was found that VHR can be further improved by containing both compounds corresponding to Compound A and Compound B.
(Examples 38 to 74, Comparative Examples 4 to 6)
The following composition (LC-B) was prepared.

The following LC-B liquid crystal composition was prepared and its physical properties were measured. The composition of the liquid crystal composition and the results of its physical properties were as shown in the table.

With respect to 100 parts by mass of the liquid crystal composition LC-B, the above formula (A-1-1), formula (A-1-2), formula (A-1-3), formula (B-1), formula The compounds represented by (B-2) and formula (H-14) were added in the proportions shown in the following table, and the fluorescence intensity and VHR were measured. The results are shown below.

From Comparative Examples 4 to 6 and Examples 38 to 74, compounds represented by formulas (A-1-1), (A-1-2), and (A-1-3) (compounds corresponding to compound A) It turns out that fluorescence intensity can be reduced by containing at least any one of these. Examples 38 to 74 were confirmed to have a higher VHR (UV) than the comparative examples. Further, from Examples 40 to 47, 40 to 57, and 60 to 74, it was found that VHR can be further improved by containing both compounds corresponding to Compound A and Compound B.

Claims

A liquid crystal composition in which the total amount of fluorescence intensity of a liquid crystal compound excited by light having a wavelength shorter than 400 nm is 10,000 RFU (relative light unit) or less.
The liquid crystal composition according to claim 1, comprising one or more compounds having an absorption peak of 400 nm or less.
3. The liquid crystal composition according to claim 2, wherein the compound having an absorption peak of 400 nm or less is a compound having a molecular weight of 400 or less.
The liquid crystal composition according to claim 2 or 3, wherein the total content of compounds having an absorption peak of 400 nm or less is 0.001 mass% or more and 5 mass% or less in the liquid crystal composition.
The liquid crystal composition according to claim 1, further comprising a compound that traps radicals in the liquid crystal composition.
6. The liquid crystal according to claim 5, wherein the ratio of the total content of compounds having an absorption peak of 400 nm or less and the total content of compounds capturing radicals in the liquid crystal composition is in the range of 1: 1 to 1: 10000. Composition.
General formula (II) as a liquid crystal compound

(Wherein R II1 represents an alkyl group having 1 to 10 carbon atoms, and one or two or more non-adjacent —CH 2 — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or —OCO—,
A II1 and A II2 each independently (a) 1,4-cyclohexylene group (this is present in the group one -CH 2 - or nonadjacent two or more -CH 2 - is -O And (b) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ are replaced with —N =). May be.)
(C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or One —CH═ present in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent —CH═ may be replaced by —N═. )
The group (a), the group (b) and the group (c) are each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z II1 represents a single bond, —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —OCF 2 —, —CF 2 O—. -CH = NN-CH-, -CH = CH-, -CF = CF- or -C≡C-
Y II1 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group or an alkyl group having 1 to 10 carbon atoms, and one or non-adjacent two or more —CH 2 — in the alkyl group are each independently Optionally substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—, and one or more hydrogens in the alkyl group The atom may be substituted with a fluorine atom,
m II1 each represents 1, 2, 3 or 4, if m II1 is representative of the 2, 3 or 4, A II1 and Z II1 there is a plurality may be the same or different. )
The liquid crystal composition according to any one of claims 1 to 6, which comprises one or more compounds represented by the formula:
A display device using the composition according to any one of claims 1 to 7.