JP7035430B2 - Liquid crystal composition and liquid crystal display element using it - Google Patents

Description

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

The liquid crystal composition used in the liquid crystal display element is required to be stable to external stimuli such as moisture, air, heat, and light. If the stability against an external stimulus is impaired, display defects such as burn-in and display unevenness occur on the liquid crystal display element. It is generally considered that a high voltage retention (VHR) is essential to prevent display defects such as burn-in and display unevenness, and for this purpose, for example, antioxidants, ultraviolet absorbers or light. It is known to use a liquid crystal composition in which a stabilizer and a specific compound are combined (Patent Document 1 and Patent Document 2). Stability against this external stimulus was emphasized in all applications, and further development of a liquid crystal composition capable of achieving high VHR was required.

Japanese Unexamined Patent Publication No. 2006-37054 Japanese Unexamined Patent Publication No. 2008-144135

An object to be solved by the present invention is to provide a liquid crystal composition having an improved voltage retention rate, and to provide a liquid crystal display element having excellent durability by using the liquid crystal composition.

In the present invention, the compounds represented by the following general formulas (I-1) and (I-2) function as hydrogen fluoride quenching agents, and are contained in the liquid crystal composition by external stimuli such as heat and light. It reacts with hydrogen fluoride that can be generated as a decomposition product to form a relatively stable compound, and by adding the compound, hydrogen fluoride that can be generated as a decomposition product of a liquid crystal compound can be stabilized. Therefore, they have found that a highly reliable liquid crystal composition having an improved voltage retention rate can be obtained, and have completed the present invention.

［式中、Ｒ^ｉ１１、Ｒ^ｉ１２及びＲ^ｉ２１はそれぞれ独立して水素原子又は炭素原子数１から１５のアルキル基を表し、該アルキル基中に存在する１個の－ＣＨ_２－又は隣接していない２個以上の－ＣＨ_２－はそれぞれ独立して－ＣＨ＝ＣＨ－、－Ｃ≡Ｃ－、－Ｏ－、－Ｓ－、－ＣＯ－、－ＣＯＯ－、又は－ＯＣＯ－に置き換えられてもよく、
Ｚ^ｉ１１及びＺ^ｉ２１はそれぞれ独立して単結合、－ＣＨ_２ＣＨ_２－、－（ＣＨ_２）_４－、－ＯＣＨ_２－、－ＣＨ_２Ｏ－、－ＣＯＯ－、－ＯＣＯ－、－ＯＣＦ_２－、－ＣＦ_２Ｏ－、－ＣＨ＝Ｎ－Ｎ＝ＣＨ－、－ＣＨ＝ＣＨ－、－ＣＦ＝ＣＦ－又は－Ｃ≡Ｃ－を表し、
Ａ^ｉ１１は
（ａ）１，４－シクロヘキシレン基（この基中に存在する１個の－ＣＨ_２－又は隣接していない２個の－ＣＨ_２－は－ＮＲ^ｉ－に置き換えられており、Ｒ^ｉは水素原子又は炭素原子数１から５のアルキル基を表し、該アルキル基中に存在する１個の－ＣＨ_２－又は隣接していない２個以上の－ＣＨ_２－はそれぞれ独立して－ＣＨ＝ＣＨ－、－Ｃ≡Ｃ－、－Ｏ－、－Ｓ－、－ＣＯ－、－ＣＯＯ－、又は－ＯＣＯ－に置き換えられてもよい。）又は、
（ｂ）１，４－フェニレン基（この基中に存在する１個の－ＣＨ＝又は隣接していない２個の－ＣＨ＝は－Ｎ＝に置き換えられている。）を表し、
Ａ^ｉ２１は
（ｃ）４－ピリジル基（この基中に存在する１個の－ＣＨ＝又は隣接していない２個の－ＣＨ＝は－Ｎ＝に置き換えられていてもよい。）を表し、上記の基（ａ）、基（ｂ）及び基（ｃ）中の水素原子はそれぞれ独立してシアノ基、フッ素原子又は塩素原子で置換されていてもよい。］
即ち、本発明は、以下の［１］～［１０］に関する。

[In the formula, R ⁱ¹¹ , R ⁱ¹² and R ⁱ²¹ each independently represent a hydrogen atom or an alkyl group having 1 to 15 carbon atoms, and one -CH _2- or adjacent to the alkyl group is present. No two or more -CH _2- are independently replaced by -CH = CH-, -C≡C-, -O-, -S-, -CO-, -COO-, or -OCO-. Well,
Z ⁱ¹¹ and Z ⁱ²¹ are independently single-bonded, -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-
A ⁱ¹¹ is (a) a 1,4-cyclohexylene group (one -CH _2- or two non-adjacent -CH ₂ -existing in this group is replaced with -NR ^i- . ^Ri represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and one -CH _2- or _two or more non-adjacent-CH 2- present in the alkyl group is independent of each other. It may be replaced with -CH = CH-, -C≡C-, -O-, -S-, -CO-, -COO-, or -OCO-) or.
(B) Represents a 1,4-phenylene group (one -CH = existing in this group or two non-adjacent -CH = are replaced with -N =).
A ⁱ²¹ represents (c) a 4-pyridyl group (one -CH = existing in this group or two non-adjacent -CH = may be replaced with -N =). The hydrogen atom in the above group (a), group (b) and group (c) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom, respectively. ]
That is, the present invention relates to the following [1] to [10].

[1] The following general formulas (I-1) and general formulas (I-2)

［式中、Ｒ^ｉ１１、Ｒ^ｉ１２及びＲ^ｉ２１はそれぞれ独立して水素原子又は炭素原子数１から１５のアルキル基を表し、該アルキル基中に存在する１個の－ＣＨ_２－又は隣接していない２個以上の－ＣＨ_２－はそれぞれ独立して－ＣＨ＝ＣＨ－、－Ｃ≡Ｃ－、－Ｏ－、－Ｓ－、－ＣＯ－、－ＣＯＯ－、又は－ＯＣＯ－に置き換えられてもよく、
Ｚ^ｉ１１及びＺ^ｉ２１はそれぞれ独立して単結合、－ＣＨ_２ＣＨ_２－、－（ＣＨ_２）_４－、－ＯＣＨ_２－、－ＣＨ_２Ｏ－、－ＣＯＯ－、－ＯＣＯ－、－ＯＣＦ_２－、－ＣＦ_２Ｏ－、－ＣＨ＝Ｎ－Ｎ＝ＣＨ－、－ＣＨ＝ＣＨ－、－ＣＦ＝ＣＦ－又は－Ｃ≡Ｃ－を表し、
Ａ^ｉ１１は
（ａ）１，４－シクロヘキシレン基（この基中に存在する１個の－ＣＨ_２－又は隣接していない２個の－ＣＨ_２－は－ＮＲ^ｉ－に置き換えられており、Ｒ^ｉは水素原子又は炭素原子数１から５のアルキル基を表し、該アルキル基中に存在する１個の－ＣＨ_２－又は隣接していない２個以上の－ＣＨ_２－はそれぞれ独立して－ＣＨ＝ＣＨ－、－Ｃ≡Ｃ－、－Ｏ－、－Ｓ－、－ＣＯ－、－ＣＯＯ－、又は－ＯＣＯ－に置き換えられてもよい。）又は、
（ｂ）１，４－フェニレン基（この基中に存在する１個の－ＣＨ＝又は隣接していない２個の－ＣＨ＝は－Ｎ＝に置き換えられている。）を表し、
Ａ^ｉ２１は
（ｃ）４－ピリジル基（この基中に存在する１個の－ＣＨ＝又は隣接していない２個の－ＣＨ＝は－Ｎ＝に置き換えられていてもよい。）を表し、上記の基（ａ）、基（ｂ）及び基（ｃ）中の水素原子はそれぞれ独立してシアノ基、フッ素原子又は塩素原子で置換されていてもよい。］
で表される化合物からなる群より選ばれる化合物を１種又は２種以上含有する液晶組成物。
［２］ 更に、下記一般式（ＩＩ）

[In the formula, R ⁱ¹¹ , R ⁱ¹² and R ⁱ²¹ each independently represent a hydrogen atom or an alkyl group having 1 to 15 carbon atoms, and one -CH _2- or adjacent to the alkyl group is present. No two or more -CH _2- are independently replaced by -CH = CH-, -C≡C-, -O-, -S-, -CO-, -COO-, or -OCO-. Well,
Z ⁱ¹¹ and Z ⁱ²¹ are independently single-bonded, -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-
A ⁱ¹¹ is (a) a 1,4-cyclohexylene group (one -CH _2- or two non-adjacent -CH ₂ -existing in this group is replaced with -NR ^i- . ^Ri represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and one -CH _2- or _two or more non-adjacent-CH 2- present in the alkyl group is independent of each other. It may be replaced with -CH = CH-, -C≡C-, -O-, -S-, -CO-, -COO-, or -OCO-) or.
(B) Represents a 1,4-phenylene group (one -CH = existing in this group or two non-adjacent -CH = are replaced with -N =).
A ⁱ²¹ represents (c) a 4-pyridyl group (one -CH = existing in this group or two non-adjacent -CH = may be replaced with -N =). The hydrogen atom in the above group (a), group (b) and group (c) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom, respectively. ]
A liquid crystal composition containing one or more compounds selected from the group consisting of the compounds represented by.
[2] Furthermore, the following general formula (II)

［式中、Ｒ^ＩＩ１は炭素原子数１～１０のアルキル基を表し、該アルキル基中の１個又は非隣接の２個以上の－ＣＨ_２－はそれぞれ独立して－ＣＨ＝ＣＨ－、－Ｃ≡Ｃ－、－Ｏ－、－ＣＯ－、－ＣＯＯ－又は－ＯＣＯ－によって置換されていてもよく、
Ａ^ＩＩ１及びＡ^ＩＩ２はそれぞれ独立して
（ａ） １，４－シクロヘキシレン基（この基中に存在する１個の－ＣＨ_２－又は隣接していない２個の－ＣＨ_２－は－Ｏ－に置き換えられてもよい。）
（ｂ） １，４－フェニレン基（この基中に存在する１個の－ＣＨ＝又は隣接していない２個の－ＣＨ＝は－Ｎ＝に置き換えられてもよい。）及び
（ｃ） ナフタレン－２，６－ジイル基、１，２，３，４－テトラヒドロナフタレン－２，６－ジイル基又はデカヒドロナフタレン－２，６－ジイル基（ナフタレン－２，６－ジイル基又は１，２，３，４－テトラヒドロナフタレン－２，６－ジイル基中に存在する１個の－ＣＨ＝又は隣接していない２個以上の－ＣＨ＝は－Ｎ＝に置き換えられてもよい。）
からなる群より選ばれる基を表し、上記の基（ａ）、基（ｂ）及び基（ｃ）中の水素原子はそれぞれ独立してシアノ基、フッ素原子又は塩素原子で置換されていてもよく、
Ｚ^ＩＩ１は単結合、－ＣＨ_２ＣＨ_２－、－（ＣＨ_２）_４－、－ＯＣＨ_２－、－ＣＨ_２Ｏ－、－ＣＯＯ－、－ＯＣＯ－、－ＯＣＦ_２－、－ＣＦ_２Ｏ－、－ＣＨ＝Ｎ－Ｎ＝ＣＨ－、－ＣＨ＝ＣＨ－、－ＣＦ＝ＣＦ－又は－Ｃ≡Ｃ－を表し、
Ｙ^ＩＩ１は水素原子、フッ素原子、塩素原子、シアノ基又は炭素原子数１～１０のアルキル基を表し、該アルキル基中の１個又は非隣接の２個以上の－ＣＨ_２－はそれぞれ独立して－ＣＨ＝ＣＨ－、－Ｃ≡Ｃ－、－Ｏ－、－ＣＯ－、－ＣＯＯ－又は－ＯＣＯ－によって置換されていてもよく、また、アルキル基中の１個又は２個以上の水素原子はフッ素原子で置換されていてもよく、
ｍ^ＩＩ１は１、２、３又は４を表すが、ｍ^ＩＩ１が２、３又は４を表す場合、複数存在するＡ^ＩＩ１及びＺ^ＩＩ１は同一であっても異なっていても良い。］
で表される化合物を１種又は２種以上含有する［１］に記載の液晶組成物。
［３］ ２５℃における誘電率異方性（Δε）が負の値を有する［１］又は［２］に記載の液晶組成物。
［４］ ２５℃における誘電率異方性（Δε）が正の値を有する［１］又は［２］に記載の液晶組成物。
［５］ 一般式（Ｉ－１）及び一般式（Ｉ－２）で表される化合物からなる群より選ばれる化合物の含有量の総量が液晶組成物中０．０５質量％から５質量％である［１］から［４］のいずれか１項に記載の液晶組成物。
［６］ 一般式（ＩＩ）で表される化合物の含有量の総量が液晶組成物において１０質量％から９０質量％である［２］から［５］のいずれか１項に記載の液晶組成物。
［７］ ２５℃における屈折率異方性（Δｎ）が０．０８から０．１４の範囲であり、２５℃における回転粘性（γ１）が６０から１３０ｍＰａ・ｓの範囲であり、ネマチック相－等方性液体相転移温度（Ｔ_ｎｉ）が６０℃から１２０℃の範囲である［１］から［６］のいずれか１項に記載の液晶組成物。
［８］ 重合性化合物及び／又は酸化防止剤を１種又は２種以上含有する［１］から［７］のいずれか１項に記載の液晶組成物。
［９］ ［１］から［８］のいずれか１項に記載の液晶組成物を用いた液晶表示素子。

[In the formula, 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 independently -CH = CH-,-, respectively. It may be substituted with C≡C-, -O-, -CO-, -COO- or -OCO-.
A ^II1 and A ^II2 are independently (a) 1,4-cyclohexylene group (one -CH _2- or two non-adjacent -CH ₂ -existing in this group is -O- May be replaced with.)
(B) 1,4-phenylene group (one -CH = existing in this group or two non-adjacent -CH = may be replaced with -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, One -CH = present in the 3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be replaced with -N =).
Represents a group selected from the group consisting of, and the hydrogen atom in the above group (a), group (b) and group (c) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom, respectively. ,
Z ^II1 is 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 of the alkyl groups or two or more non-adjacent _−CH2 −s are independent of each other. It may be substituted with -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-, and one or more hydrogens in the alkyl group. Atoms may be substituted with fluorine atoms,
Although m ^II1 represents 1, 2, 3 or 4, when m ^II1 represents 2, 3 or 4, a plurality of A ^II1 and Z ^II1 may be the same or different. ]
The liquid crystal composition according to [1], which contains one or more compounds represented by.
[3] The liquid crystal composition according to [1] or [2], wherein the dielectric anisotropy (Δε) at 25 ° C. has a negative value.
[4] The liquid crystal composition according to [1] or [2], wherein the dielectric anisotropy (Δε) at 25 ° C. has a positive value.
[5] The total content of the compound selected from the group consisting of the compounds represented by the general formula (I-1) and the general formula (I-2) is 0.05% by mass to 5% by mass in the liquid crystal composition. The liquid crystal composition according to any one of [1] to [4].
[6] The liquid crystal composition according to any one of [2] to [5], wherein the total content of the compound represented by the general formula (II) is 10% by mass to 90% by mass in the liquid crystal composition. ..
[7] The refractive index anisotropy (Δn) at 25 ° C. is in the range of 0.08 to 0.14, the rotational viscosity (γ1) at 25 ° C. is in the range of 60 to 130 mPa · s, and the nematic phase-etc. The liquid crystal composition according to any one of [1] to [6], wherein the anisotropic liquid phase transition temperature (T _ni ) is in the range of 60 ° C to 120 ° C.
[8] The liquid crystal composition according to any one of [1] to [7], which contains one or more of a polymerizable compound and / or an antioxidant.
[9] A liquid crystal display element using the liquid crystal composition according to any one of [1] to [8].

Since the liquid crystal composition of the present invention can improve the antioxidant property and the voltage retention rate, a liquid crystal display element having excellent durability can be obtained by using the liquid crystal composition for the liquid crystal display element.

The liquid crystal composition in the present invention has the following general formula (I-1) and general formula (I-2).

［式中、Ｒ^ｉ１１、Ｒ^ｉ１２及びＲ^ｉ２１はそれぞれ独立して水素原子又は炭素原子数１から１５のアルキル基を表し、該アルキル基中に存在する１個の－ＣＨ_２－又は隣接していない２個以上の－ＣＨ_２－はそれぞれ独立して－ＣＨ＝ＣＨ－、－Ｃ≡Ｃ－、－Ｏ－、－Ｓ－、－ＣＯ－、－ＣＯＯ－、又は－ＯＣＯ－に置き換えられてもよく、
Ｚ^ｉ１１及びＺ^ｉ２１はそれぞれ独立して単結合、－ＣＨ_２ＣＨ_２－、－（ＣＨ_２）_４－、－ＯＣＨ_２－、－ＣＨ_２Ｏ－、－ＣＯＯ－、－ＯＣＯ－、－ＯＣＦ_２－、－ＣＦ_２Ｏ－、－ＣＨ＝Ｎ－Ｎ＝ＣＨ－、－ＣＨ＝ＣＨ－、－ＣＦ＝ＣＦ－又は－Ｃ≡Ｃ－を表し、
Ａ^ｉ１１は
（ａ）１，４－シクロヘキシレン基（この基中に存在する１個の－ＣＨ_２－又は隣接していない２個の－ＣＨ_２－は－ＮＲ^ｉ－に置き換えられており、Ｒ^ｉは水素原子又は炭素原子数１から５のアルキル基を表し、該アルキル基中に存在する１個の－ＣＨ_２－又は隣接していない２個以上の－ＣＨ_２－はそれぞれ独立して－ＣＨ＝ＣＨ－、－Ｃ≡Ｃ－、－Ｏ－、－Ｓ－、－ＣＯ－、－ＣＯＯ－、又は－ＯＣＯ－に置き換えられてもよい。）又は、
（ｂ）１，４－フェニレン基（この基中に存在する１個の－ＣＨ＝又は隣接していない２個の－ＣＨ＝は－Ｎ＝に置き換えられている。）を表し、
Ａ^ｉ２１は
（ｃ）４－ピリジル基（この基中に存在する１個の－ＣＨ＝又は隣接していない２個の－ＣＨ＝は－Ｎ＝に置き換えられていてもよい。）を表し、上記の基（ａ）、基（ｂ）及び基（ｃ）中の水素原子はそれぞれ独立してシアノ基、フッ素原子又は塩素原子で置換されていてもよい。］
で表される化合物からなる群より選ばれる化合物を１種又は２種以上含有する液晶組成物である。以下、一般式（Ｉ－１）及び一般式（Ｉ－２）を総称して、一般式（Ｉ）ともいう。一般式（Ｉ）で表される化合物は、液晶組成物中に発生するフッ化水素のクエンチ剤として機能する。

[In the formula, R ⁱ¹¹ , R ⁱ¹² and R ⁱ²¹ each independently represent a hydrogen atom or an alkyl group having 1 to 15 carbon atoms, and one -CH _2- or adjacent to the alkyl group is present. No two or more -CH _2- are independently replaced by -CH = CH-, -C≡C-, -O-, -S-, -CO-, -COO-, or -OCO-. Well,
Z ⁱ¹¹ and Z ⁱ²¹ are independently single-bonded, -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-
A ⁱ¹¹ is (a) a 1,4-cyclohexylene group (one -CH _2- or two non-adjacent -CH ₂ -existing in this group is replaced with -NR ^i- . ^Ri represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and one -CH _2- or _two or more non-adjacent-CH 2- present in the alkyl group is independent of each other. It may be replaced with -CH = CH-, -C≡C-, -O-, -S-, -CO-, -COO-, or -OCO-) or.
(B) Represents a 1,4-phenylene group (one -CH = existing in this group or two non-adjacent -CH = are replaced with -N =).
A ⁱ²¹ represents (c) a 4-pyridyl group (one -CH = existing in this group or two non-adjacent -CH = may be replaced with -N =). The hydrogen atom in the above group (a), group (b) and group (c) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom, respectively. ]
A liquid crystal composition containing one or more compounds selected from the group consisting of the compounds represented by. Hereinafter, the general formula (I-1) and the general formula (I-2) are collectively referred to as the general formula (I). The compound represented by the general formula (I) functions as a quenching agent for hydrogen fluoride generated in the liquid crystal composition.

In the general formula (I), ^Ri11 , ^Ri12 and ^Ri21 are preferably a linear or branched alkyl group having 1 to 15 carbon atoms, and more preferably a linear or branched alkyl group having 3 to 10 carbon atoms. In addition, A ⁱ¹¹ is a 1,4-cyclohexylene group in which one -CH _2- is substituted with -NR- (R represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms), or one. -CH = is preferably a 1,4-phenylene group substituted with -N =. Further, Z ⁱ¹¹ and Z ⁱ²¹ are preferably single bonds. Further, A ⁱ²¹ is preferably a 4-pyridyl group.

Specific examples of preferable compounds of the compound represented by the general formula (I) of the present invention are shown below, but the present invention is not limited thereto.

（式中、Ｒはそれぞれ独立して水素原子又は炭素原子数１から５のアルキル基を表す。）

(In the formula, R independently represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.)

In the liquid crystal composition of the present invention, the total amount of the compound represented by the general formula (I) is preferably contained in the liquid crystal composition as a lower limit of 0.01% or more, preferably 0.02% or more. , 0.05% or more, preferably 0.07% or more, preferably 0.1% or more, preferably 0.2% or more, and preferably 0.5. % Or more, preferably 0.7% or more, preferably 1.0% or more, preferably 1.5% or more, and preferably 2.0% or more. preferable. Further, as an upper limit value, it is preferably contained in an amount of 5% or less, preferably 4% or less, preferably 3% or less, preferably 2.7% or less, and 2.6% or less. It is preferably 1.2% or less, 1.5% or less, 2.5% or less, 2.4% or less, and 2. It is preferably contained in an amount of 3% or less, preferably 2.2% or less, preferably 2.1% or less, and preferably 2.0% or less. More specifically, it is preferably contained in an amount of 0.01 to 5% by mass, preferably 0.05 to 3.0% by mass, and even more preferably 0.05 to 2.0% by mass. It is particularly preferably 0.05 to 1.5% by mass.

In the liquid crystal composition of the present invention, the compound represented by the general formula (I) reacts with hydrogen fluoride to become a stable compound. Therefore, in the liquid crystal composition of the present invention, the compound constituting the liquid crystal composition. The influence of hydrogen fluoride generated from can be suppressed.

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

[In the formula, 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 independently -CH = CH-,-, respectively. It may be substituted with C≡C-, -O-, -CO-, -COO- or -OCO-.
A ^II1 and A ^II2 are independently (a) 1,4-cyclohexylene groups (one -CH _2- or two or more non-adjacent -CH ₂ -existing in this group-O. May be replaced with-)
(B) 1,4-Phenylene group (one -CH = existing in this group or two or more non-adjacent -CH = may be replaced with -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-A single -CH = present in a diyl group or two or more non-adjacent -CH = may be replaced with -N =).
Represents a group selected from the group consisting of, and the hydrogen atom in the above group (a), group (b) and group (c) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom, respectively. ,
Z ^II1 is 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 of the alkyl groups or two or more non-adjacent _−CH2 −s are independent of each other. It may be substituted with -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-, and one or more hydrogens in the alkyl group. Atoms may be substituted with fluorine atoms,
Although m ^II1 represents 1, 2, 3 or 4, when m ^II1 represents 2, 3 or 4, a plurality of A ^II1 and Z ^II1 may be the same or different. ]

<First aspect of the compound represented by the general 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 a compound represented by the following general formula (J).
As the compound represented by the general formula (II), it is preferable to contain one or more compounds represented by the general formula (J). These compounds are dielectrically positive compounds (Δε is greater than 2).

(In the formula, ^RJ1 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 independently -CH = CH-,-, respectively. It may be substituted with C≡C-, -O-, -CO-, -COO- or -OCO-.
n ^J1 represents 0, 1, 2, 3 or 4
A ^J1 , A ^J2 and A ^J3 are independent of each other.
(A) 1,4-Cyclohexylene group (one -CH _2- or _two non-adjacent -CH 2- existing in this group may be replaced with -O-).
(B) 1,4-phenylene group (one -CH = existing in this group or two non-adjacent -CH = may be replaced with -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, One -CH = present in the 3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be replaced with -N =).
Represents a group selected from the group consisting of, and the hydrogen atoms in the above groups (a), groups (b) and groups (c) are independently cyano groups, fluorine atoms, chlorine atoms, methyl groups and trifluoromethyl, respectively. It may be substituted with a group or a trifluoromethoxy group.
Z ^J1 and Z ^J2 are independently single-bonded, -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 there are a plurality of A ^J2s , they may be the same or different, and when n ^J1 is 2, 3 or 4, there are a plurality of Z ^J1s . If so, they may be the same or different,
^XJ1 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 ( ^J ), RJ1 is 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. The group is preferable, 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. An alkyl group having 1 to 5 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 further preferable, and an alkenyl group having 3 carbon atoms is more preferable. (Propenyl group) is particularly preferable.
When reliability is important, ^RJ1 is preferably an alkyl group, and when reduction in viscosity is important, it is preferably an alkenyl group.

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 are used. An alkoxy group having 4 to 5 atoms is preferable, and when the ring structure to which the alkoxy group is bonded is a saturated ring structure such as cyclohexane, pyran, or dioxane, a linear alkyl group having 1 to 5 carbon atoms or a linear chain is used. Alkoxy groups having 1 to 4 carbon atoms and linear alkenyl groups having 2 to 5 carbon atoms are preferable. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if any, is preferably 5 or less, and is preferably linear.
The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5). (The black dots in each formula represent carbon atoms 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 increase Δn independently, and are preferably aliphatic in order to improve the response rate, and trans-. 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 It preferably represents a -2,6-diyl group, a decahydronaphthalene-2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, which are substituted with fluorine atoms. It may be more preferable to represent the following structure.

It is more preferable to represent the following structure.

Z ^J1 and Z ^J2 independently represent -CH ₂ O-, -OCH _2- , -CF ₂ O-, -CH ₂ CH _2- , -CF ₂ CF _2- or single bond, respectively, preferably-. OCH _2- , -CF ₂ O-, -CH ₂ CH _2- or single bond is more preferred, and -OCH _2- , -CF ₂ O- or single bond is particularly preferred.
^XJ1 is preferably a fluorine atom or a trifluoromethoxy group, and a fluorine atom is preferable.
^nJ1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when focusing on improvement of Δε, and preferably 1 or 2 when focusing on Tni. ..
The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one, two, and three as one embodiment of the present invention. Further, in another embodiment of the present invention, there are 4 types, 5 types, 6 types, and 7 or more types.

In the composition of the present invention, the content of the compound represented by the general formula (J) is solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and the like. It is necessary to make appropriate adjustments according to the 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%, and 30%. It is 40%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%. The preferred upper limit of the content is, for example, 95%, 85%, 75%, 65%, 55%, for example, in one form of the invention, relative to the total amount of the composition of the invention. Yes, 45%, 35%, 25%.

When a composition having a low viscosity and a high response rate is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the composition of the present invention is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.
When reliability is important, ^RJ1 is preferably an alkyl group, and when reduction in viscosity is important, it is preferably an alkenyl group.

As the compound represented by the general formula (J), the compound represented by the general formula (M) and the 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 are dielectrically positive compounds (Δε is greater than 2).

(In the formula, ^RM1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent _−CH2 −s in the alkyl group are independently −CH = CH−, −, respectively. It may be substituted with C≡C-, -O-, -CO-, -COO- or -OCO-.
n ^M1 represents 0, 1, 2, 3 or 4
^AM1 and ^AM2 are independent of each other,
(A) A 1,4-cyclohexylene group (one -CH _2- or two or more non-adjacent-CH ₂ -existing in this group may be replaced with -O- or -S-. (May be) and (b) 1,4-phenylene group (one -CH = existing in this group or two or more non-adjacent -CH = may be replaced with -N =).
Represents a group selected from the group consisting of, and the hydrogen atoms on the above groups (a) and (b) may be independently substituted with cyano groups, fluorine atoms or chlorine atoms, respectively.
Z ^M1 and Z ^M2 are independently single-bonded, -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 there are a plurality of A ^M2s , they may be the same or different, and when n ^M1 is 2, 3 or 4, there are a plurality of Z ^M1s . If so, they may be the same or different,
X ^M1 and X ^M3 independently represent a hydrogen atom, a chlorine atom or a fluorine atom, respectively.
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 ), RM1 is 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. The group is preferable, 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. An alkyl group having 1 to 5 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 further preferable, and an alkenyl group having 3 carbon atoms is more preferable. (Propenyl group) is particularly preferable.
When reliability is important, ^RM1 is preferably an alkyl group, and when reduction in viscosity is important, it is preferably an alkenyl group.

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 are used. An alkoxy group having 4 to 5 atoms is preferable, and when the ring structure to which the alkoxy group is bonded is a saturated ring structure such as cyclohexane, pyran, or dioxane, a linear alkyl group having 1 to 5 carbon atoms or a linear chain is used. Alkoxy groups having 1 to 4 carbon atoms and linear alkenyl groups having 2 to 5 carbon atoms are preferable. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if any, is preferably 5 or less, and is preferably linear.
The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5). (The black dots in each formula represent carbon atoms in the ring structure to which the alkenyl group is bonded.)

A ^M1 and ^AM2 are preferably aromatic when it is required to increase Δn independently, and are preferably aliphatic in order to improve the response rate, 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 is preferable to represent a diyl group, a decahydronaphthalene-2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and more preferably to represent the following structure.

It is more preferable to represent the following structure.

Z ^M1 and Z ^M2 independently represent -CH ₂ O-, -CF ₂ O-, -CH ₂ CH _2- , -CF ₂ CF _2- or a single bond, respectively, preferably -CF ₂ O-, -CH ₂ CH _2- or single bond is more preferred, and -CF ₂ O- or single bond is particularly preferred.
n ^M1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when focusing on improvement of Δε, and preferably 1 or 2 when focusing on Tni. ..
The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one, two, and three as one embodiment of the present invention. Further, in another embodiment of the present invention, there are 4 types, 5 types, 6 types, and 7 or more types.

In the composition of the present invention, the content of the compound represented by the general formula (M) is solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and the like. It is necessary to make appropriate adjustments according to the 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%, and 30. %, 40%, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The preferred upper limit of the content is, for example, 95%, 85%, 75%, 65%, 55%, for example, in one form of the invention, relative to the total amount of the composition of the invention. Yes, 45%, 35%, 25%.
When a composition having a low viscosity and a high response rate is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the composition of the present invention is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.
Specifically, the liquid crystal compound represented by the general formula (M) is preferably the following general formula (M-1) and general formula (M-2).

(In the formula, 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 independent hydrogens, respectively. Representing an atom or a fluorine atom, Y ³¹ represents a fluorine atom or OCF ₃ , and M ³¹ to M ³³ independently represent 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 or two in the phenylene group. The two hydrogen atoms may be substituted with a fluorine atom, where n ³¹ and n ³² independently represent 0, 1 or 2, and n ⁴¹ + n ⁴² represent 1, 2 or 3).
The liquid crystal compound represented by the general formula (M-1) is preferably a compound represented by the following general formulas (M-1-a) to (M-1-f).

(In the formula, R ³¹ , X ³¹ , X ³² and Y ³¹ have the same meaning as R ³¹ , X ³¹ , X ³² and Y ³¹ in the general formula (M), and X ³⁴ to X ³⁹ are independent of each other. Represents a hydrogen atom or a fluorine atom.)
The liquid crystal compound represented by the general formula (M-2) is preferably a compound represented by the following general formulas (M-2-a) to (M-2-n).

(In the formula, R ³¹ , X ³¹ , X ³² and Y ³¹ have the same meaning as R ³¹ , X ³¹ , X ³² and Y ³¹ in the general formula (M), and X ³⁴ to X ³⁹ are independent of each other. Represents a hydrogen atom or a fluorine atom.)
Further, the liquid crystal compound represented by the general formula (M) is preferably preferably a general formula (M-26) from the following general formula (M-3).

(In the formula, R ³¹ , X ³¹ , X ³² and Y ³¹ have the same meaning as R ³¹ , X ³¹ , X ³² and Y ³¹ in the general formula (M), and X ³⁴ to X ³⁹ are independent of each other. Represents a hydrogen atom or a fluorine atom.)
The composition of the present invention preferably contains one or more compounds represented by the general formula (K). These compounds are dielectrically positive compounds (Δε is greater than 2).

(In the formula, ^RK1 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 independently -CH = CH-,-, respectively. It may be substituted with C≡C-, -O-, -CO-, -COO- or -OCO-.
n ^K1 represents 0, 1, 2, 3 or 4
^AK1 and ^AK2 are independent of each other,
(A) A 1,4-cyclohexylene group (one -CH _2- or two non-adjacent -CH ₂ -existing in this group may be replaced with -O- or -S-. ) And (b) 1,4-phenylene group (one -CH = existing in this group or two non-adjacent -CH = may be replaced with -N =).
Represents a group selected from the group consisting of, and the hydrogen atoms on the above groups (a) and (b) may be independently substituted with cyano groups, fluorine atoms or chlorine atoms, respectively.
Z ^K1 and Z ^K2 are independently single-bonded, -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 there are a plurality of ^AK2s , they may be the same or different, and when ^nK1 is 2,3 or 4, there are a plurality of ^ZK1s . If so, they may be the same or different,
X ^K1 and X ^K3 independently represent a hydrogen atom, a chlorine atom or a fluorine atom, respectively.
^XK2 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 (K), ^RK1 is 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. The group is preferable, 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. An alkyl group having 1 to 5 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 further preferable, and an alkenyl group having 3 carbon atoms is more preferable. (Propenyl group) is particularly preferable.
When reliability is important, ^RK1 is preferably an alkyl group, and when reduction in viscosity is important, it is preferably an alkenyl group.

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 are used. An alkoxy group having 4 to 5 atoms is preferable, and when the ring structure to which the alkoxy group is bonded is a saturated ring structure such as cyclohexane, pyran, or dioxane, a linear alkyl group having 1 to 5 carbon atoms or a linear chain is used. Alkoxy groups having 1 to 4 carbon atoms and linear alkenyl groups having 2 to 5 carbon atoms are preferable. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if any, is preferably 5 or less, and is preferably linear.
The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5). (The black dots in each formula represent carbon atoms in the ring structure to which the alkenyl group is bonded.)

^AK1 and ^AK2 are preferably aromatic when it is required to increase Δn independently, and are preferably aliphatic in order to improve the response rate, 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 is preferable to represent a diyl group, a decahydronaphthalene-2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and more preferably to represent the following structure.

下記の構造を表すことがより好ましい。

It is more preferable to represent the following structure.

Z ^K1 and Z ^K2 independently represent -CH ₂ O-, -CF ₂ O-, -CH ₂ CH _2- , -CF ₂ CF _2- or a single bond, respectively, preferably -CF ₂ O-, -CH ₂ CH _2- or single bond is more preferred, and -CF ₂ O- or single bond is particularly preferred.
n ^K1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when focusing on improvement of Δε, and preferably 1 or 2 when focusing on Tni. ..
The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one, two, and three as one embodiment of the present invention. Further, in another embodiment of the present invention, there are 4 types, 5 types, 6 types, and 7 or more types.

In the composition of the present invention, the content of the compound represented by the general formula (K) is solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and the like. It is necessary to make appropriate adjustments according to the 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 preferred upper limit of the content is, for example, 95%, 85%, 75%, 65%, 55%, for example, in one form of the invention, relative to the total amount of the composition of the invention. Yes, 45%, 35%, 25%.

When a composition having a low viscosity and a high response rate is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the composition of the present invention is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.
Specifically, the liquid crystal compound represented by the general formula (K) is preferably the following general formula (K-1) and general formula (K-2).

(In the formula, 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 independent hydrogens, respectively. Y 41 represents an atom or a fluorine atom, Y ⁴¹ represents a fluorine atom or OCF ₃ , and M ⁴¹ to M ⁴³ independently represent 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 or two in the phenylene group. The two hydrogen atoms may be substituted with a fluorine atom, where n ⁴¹ and n ⁴² independently represent 0, 1 or 2, and n ⁴¹ + n ⁴² represent 1, 2 or 3).
The liquid crystal compound represented by the general formula (K-1) is preferably a compound represented by the following general formulas (K-1-a) to (K-1-d).

(In the formula, R ⁴¹ , X ⁴¹ , X ⁴² and Y ⁴¹ have the same meaning as R ⁴¹ , X ⁴¹ , X ⁴² and Y ⁴¹ in the general formula (K), and X ⁴⁴ to X ⁴⁹ are independent of each other. Represents a hydrogen atom or a fluorine atom.)
The liquid crystal compound represented by the general formula (K-2) is preferably a compound represented by the following general formulas (K-2-a) to (K-2-g).

(In the formula, R ⁴¹ , X ⁴¹ , X ⁴² and Y ⁴¹ have the same meaning as R ⁴¹ , X ⁴¹ , X ⁴² and Y ⁴¹ in the general formula (K), and X ⁴⁴ to X ⁴⁹ are independent of each other. Represents a hydrogen atom or a fluorine atom.)
Further, the liquid crystal compound represented by the general formula (K) is preferably preferably a general formula (K-5) from the following general formula (K-3).

（式中、Ｒ^４１、Ｘ^４１、Ｘ^４２及びＹ^４１は一般式（Ｋ）中のＲ^４１、Ｘ^４１、Ｘ^４２及びＹ^４１と同じ意味を表し、Ｘ^４４～Ｘ^４９はそれぞれ独立して水素原子又はフッ素原子を表す。）

(In the formula, R ⁴¹ , X ⁴¹ , X ⁴² and Y ⁴¹ have the same meaning as R ⁴¹ , X ⁴¹ , X ⁴² and Y ⁴¹ in the general formula (K), and X ⁴⁴ to X ⁴⁹ are independent of each other. Represents a hydrogen atom or a fluorine atom.)

<Second aspect of the compound represented by the 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 is the following general formula (N-1), general formula (N-2) and general formula (N-1). The compound represented by N-3) can be mentioned.
As the compound represented by the general formula (II), it is preferable to contain one or more compounds selected from the compound group represented by the general formula (N-1) to the general formula (N-3).

(In the formula, ^RN11 , ^RN12 , ^RN21 , ^RN22 , ^RN31 and ^RN32 each independently represent an alkyl group having 1 to 8 carbon atoms, and one of the alkyl groups or two non-adjacent ones. More than one -CH _2- may be independently substituted with -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-.
^{AN11, AN12, AN21, AN22, AN31 and AN32 are independently ( a )} 1,4-cyclohexylene groups (one -CH _2- or adjacent to each other present in this group). No two -CH _2- may be replaced with -O-.)
(B) 1,4-phenylene group (one -CH = existing in this group or two non-adjacent -CH = may be replaced with -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, One -CH = present in the 3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be replaced with -N =).
Represents a group selected from the group consisting of, and the hydrogen atom in the above group (a), group (b) and group (c) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom, respectively. ,
Z ^N11 , Z ^N12 , Z ^N21 , Z ^N22 , Z ^N31 and Z ^N32 are independently single-bonded, -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-
X ^N21 represents a hydrogen atom or a fluorine atom.
^TN31 represents -CH _2- or an oxygen atom and represents
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 independent of each other. When it is 1, 2 or 3, and there are a plurality of ^{AN11 to AN32 and Z N11 to Z N32 , they} may be the same or different. However, the compounds represented by the general formula (N-1) in the general formula (N-2) and the general formula (N-3) are excluded, and the general formula (N-2) in the general formula (N-3) is excluded. The compounds represented by are 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 its absolute value is larger than 2). However, it is preferable that the compound has a negative Δε and an absolute value of more than 3.
In the general formulas (N-1), (N-2) and (N-3), ^RN11 , ^RN12 , ^RN21 , ^RN22 , ^RN31 and ^RN32 are independent of each other and have 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 group having 2 to 8 carbon atoms is preferable, and an alkyl group having 1 to 5 carbon atoms and an number of carbon atoms are preferable. An alkoxy group of 1 to 5, 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 further preferable, and an alkenyl group (propenyl group) having 3 carbon atoms is particularly preferable. Among them, by using a compound in which at least one or more of ^RN11 and ^RN12 represents an alkenyl group and a compound represented by the general formula (I) in combination, a decrease in voltage retention (VHR) is remarkably suppressed. be able to. Similarly, by using a compound in which at least one or more of ^RN21 and ^RN22 represents an alkenyl group and a compound represented by the general formula (I) in combination, a decrease in voltage retention (VHR) is significantly suppressed. Further, by using a compound in which at least one of ^RN31 and ^RN32 represents an alkenyl group and a compound represented by the general formula (I) in combination, the voltage retention rate (VHR) is lowered. Can be remarkably suppressed.

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 are used. An alkoxy group having 4 to 5 atoms is preferable, and when the ring structure to which the alkoxy group is bonded is a saturated ring structure such as cyclohexane, pyran, or dioxane, a linear alkyl group having 1 to 5 carbon atoms or a linear chain is used. Alkoxy groups having 1 to 4 carbon atoms and linear alkenyl groups having 2 to 5 carbon atoms are preferable. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if any, is preferably 5 or less, and is preferably linear.
The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5). (The black dots in each equation represent carbon atoms in the ring structure.)

^{AN11, AN12, AN21, AN22, AN31 and AN32 are preferably aromatics when it} is required to increase Δn independently, and fat is used to improve the response rate. It is preferably a group, preferably a trans-1,4-cyclohexylene group, a 1,4-phenylene group, a 2-fluoro-1,4-phenylene group, a 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, preferably represented below. It is more preferable to represent the structure of

It is more preferable to represent 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 are independently -CH ₂ O-, -CF ₂ O-, -CH ₂ CH _2- , -CF ₂ CF _2- or single bond, respectively. , -CH ₂ O-, -CH ₂ CH _2- or single bond is more preferable, and -CH ₂ O- or single bond is particularly preferable.
Fluorine atom is preferable for X ^N21 .
Oxygen atom is preferable for ^TN31 .
n ^N11 + n ^N12 , n ^N21 + n ^N22 and n ^N31 + n ^N32 are preferably 1 or 2, n ^N11 is 1 and n ^N12 is 0, n ^N11 is 2 and n ^N12 is 0, n ^N11 is 1 and n ^N12 is 1, n ^N11 is 2 and n ^N12 is 1, n ^N21 is 1 and n ^N22 is 0, n ^N21 is 2 and n ^N22 is. A combination of 0, a combination of n ^N31 of 1 and n ^N32 of 0, and a combination of n ^N31 of 2 and n ^N32 of 0 are preferred.

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% and 20%. , 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, 25%, 20%. 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% and 20%. , 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, 25%, 20%. 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% and 20%. , 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, 25%, 20%. Is.
When a composition having a low viscosity and a high response rate is required, it is preferable that the lower limit value is low and the upper limit value is low. Further, when a composition having a high Tni of the composition of the present invention and having good temperature stability is required, it is preferable that the lower limit value is low and the upper limit value is low. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable that the above lower limit value is high and the upper limit value is high.

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

(In the formula, A ⁱ¹¹ , A ⁱ¹² and A ⁱ¹³ each independently represent a 1,4-cyclohexylene group or a 1,4-phenylene group, but one present in the 1,4-cyclohexylene group. -CH _2- or two non-adjacent -CH _2- may be replaced with -O- or -S-, and one hydrogen atom present in the 1,4-phenylene group is independent of each other. Then, it may be replaced with a fluorine atom or a chlorine atom, and Z ⁱ¹ is -OCH _2- , -CH ₂ O-, -CF ₂ O-, -OCF _2- , -CH ₂ CH _2- or -CF ₂ CF. _2- , ^mi11 and ^mi12 independently represent 0 or 1, respectively, and ^RN11 , ^RN12 , and ^ZN12 independently represent ^RN11 , ^RN12 , and Z in the general formula (N-1), respectively. It has the same meaning as ^N12 .)
The compound represented by the general formula (i-1) is preferably a compound represented by the general formula (i-1A), the general formula (i-1B) or the general formula (i-1C).

（式中、Ｒ^Ｎ１１、Ｒ^Ｎ１２、Ａ^ｉ１１及びＺ^ｉ１は、それぞれ独立して一般式（ｉ－１）におけるＲ^Ｎ１１、Ｒ^Ｎ１２、Ａ^ｉ１１及びＺ^ｉ１と同じ意味を表す。）

(In the formula, ^RN11 , ^RN12 , ^Ai11 and ^Zi1 independently represent the same meanings as ^RN11 , ^RN12 , ^Ai11 and ^Zi1 in the general formula (i-1).)

（式中、Ｒ^Ｎ１１、Ｒ^Ｎ１２、Ａ^ｉ１１、Ａ^ｉ１２及びＺ^ｉ１は、それぞれ独立して一般式（ｉ－１）におけるＲ^Ｎ１１、Ｒ^Ｎ１２、Ａ^ｉ１１、Ａ^ｉ１２及びＺ^ｉ１と同じ意味を表す。）

(In the formula, ^RN11 , ^RN12 , ^Ai11 , ^Ai12 and ^Zi1 have the same meanings as ^{RN11, RN12, Ai11 , Ai12 and Zi1} in the general formula (i-1), respectively. show.)

（式中、ｍ^ｉ１３は１を表し、Ｒ^Ｎ１１、Ｒ^Ｎ１２、Ａ^ｉ１１、Ａ^ｉ１２、Ａ^ｉ１３、Ｚ^ｉ１、Ｚ^ｉ２及びｍ^ｉ１１は、それぞれ独立的に一般式（ｉ－１）におけるＲ^Ｎ１１、Ｒ^Ｎ１２、Ａ^ｉ１１、Ａ^ｉ１２、Ａ^ｉ１３、Ｚ^ｉ１、Ｚ^ｉ２及びｍ^ｉ１１と同じ意味を表す。）
一般式（ｉ－１Ａ）で表される化合物としては、下記一般式（ｉ－１Ａ－１）～一般式（ｉ－１Ａ－４）で表される化合物が好ましい。

(In the formula, ^mi13 represents 1, and ^RN11 , ^RN12 , ^Ai11 , ^Ai12 , ^Ai13 , ^Zi1 , ^Zi2 and ^mi11 are independently ^RN11 in the general formula (i-1). , ^RN12 , A ⁱ¹¹ , A ⁱ¹² , A ⁱ¹³ , Z ⁱ¹ , Z ⁱ² and ^{mi 11} ).
As the compound represented by the general formula (i-1A), the compounds represented by the following general formulas (i-1A-1) to (i-1A-4) are preferable.

(In the formula, ^RN11 and ^RN12 independently represent the same meanings as ^RN11 and ^RN12 in the general formula (i-1), respectively.)
The compound represented by the general formula (i-1B) is preferably a compound represented by the following general formulas (i-1B-1) to (i-1B-7).

(In the formula, ^RN11 and ^RN122 independently represent the same meanings as ^RN11 and ^RN12 in the general formula (i-1), respectively.)
The compound represented by the general formula (i-1C) is preferably a compound represented by the following general formulas (i-1C-1) to (i-1C-4), and is preferably a compound represented by the general formula (i-1C-4). It is more preferable that the compound is represented by -1C-1) and the general formula (i-1C-2).

(In the formula, ^RN11 and ^RN122 independently represent the same meanings as R ⁱ¹ and R ⁱ² in the general formula (i-1), respectively.)
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 compound group represented by (i-1C) may be contained, and the general formula (i-1A), the general formula (i-1B) or the general formula (i) may be contained. It may contain one or more compounds represented by -1C). It is preferable to contain one or more compounds represented by the general formula (i-1A) and the general formula (i-1B), and more preferably 2 to 10 kinds.
More specifically, the general formula (i-1A), the general formula (i-1B) and the general formula (i-1C) are the general formula (i-1A-1), the general formula (i-1B-1) and the general formula. 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). It is more preferable that the combination of the compounds represented by -1B-1) is used.
Further, the liquid crystal composition of the present invention preferably contains one or more compounds represented by the general formula (ii) as the general formula (LC3).

(In the formula, A ⁱⁱ¹ and A ⁱⁱ² each independently represent a 1,4-cyclohexylene group or a 1,4-phenylene group, but one -CH present in the 1,4-cyclohexylene group. _Two -or two non-adjacent -CH _2- may be replaced with -O- or -S-, and one hydrogen atom present in the 1,4-phenylene group is independently fluorine. It may be substituted with an atom or a hydrogen atom, and ^mii1 and ^mii2 independently represent 1 or 2, respectively, and ^RN11 and ^RN12 independently represent ^RN11 and R in the general formula (N-1), respectively. It has the same meaning as ^N12 .)
As the general formula (ii-1), it is preferable to contain one or more compounds represented by the general formula (ii-1).

(In the formula, ^RN11 , ^RN12 , A ⁱⁱ¹ and ⁱⁱⁱ¹ have the same meanings as ^RN11 , ^RN12 , A ⁱⁱ¹ and ⁱⁱⁱ¹ in the general formula (ii).)
The compound represented by the general formula (ii-1) is preferably a compound represented by the general formula (ii-1A) or the general formula (ii-1B).

(In the formula, ^RN11 , ^RN12 and ^{Aii1 have the same meanings as RN11, RN12 and Aii1 in} the general formula (ii)).

(In the formula, A ⁱⁱ¹¹ and A ⁱⁱ¹¹ each independently represent a 1,4-cyclohexylene group or a 1,4-phenylene group, but one -CH present in the 1,4-cyclohexylene group. _Two -or two non-adjacent -CH _2- may be replaced with -O- or -S-, and one hydrogen atom present in the 1,4-phenylene group is independently fluorine. It may be replaced with an atom or a hydrogen atom, and ^RN11 and ^{RN12 have the same meaning as RN11 and RN12} in the general formula (ii).
As the compound represented by the general formula (ii-1A), the compounds represented by the following general formulas (ii-1A-1) and general formula (ii-1A-2) are preferable.

(In the formula, ^RN11 and ^{RN12 have the same meanings as RN11 and RN12} in the general formula (ii).)
The compound represented by the general formula (ii-1B) is preferably a compound represented by the following general formulas (ii-1B-1) to (ii-1B-3).

(In the formula, ^RN11 and ^{RN12 have the same meanings as RN11 and RN12} in the general formula (ii).)
The liquid crystal composition of the present invention preferably contains one or more compounds represented by the general formula (ii), but is represented by the general formula (ii-1A) and the general formula (ii-1B). One or more compounds selected from the above compound group may be contained, or one or more compounds represented by the general formula (ii-1A) and the general formula (ii-1B) may be contained. May be good. It is preferable to contain 2 to 10 kinds of compounds represented by the general formula (ii-1A) and the 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), and the general formula (ii-). 1B) preferably contains one or more compounds selected from the compound group represented by the general formula (ii-1B-1) and the general formula (ii-1B-2), and the general formula (ii-). It is more preferable that the combination of the compounds represented by 1A-1) and the general formula (ii-1B-1) is used.
Further, as the general formula (N-1), it is preferable to contain one or more compounds represented by the following general formula (LC3-b).

(In the formula, ^RN11 , ^RN12 , ^AN11 , ^AN12 and Z ^N11 have the same meanings as ^RN11 , ^RN12 , ^AN11 , ^AN12 and Z ^N11 in the general formula (N-1), respectively. X ^LC3b1 to X ^LC3b4 represent hydrogen atoms or fluorine atoms, but at least one combination of X ^LC3b1 and X ^LC3b2 , or X ^LC3b3 and X ^LC3b4 both represents a fluorine atom, and m ^LC3b1 represents 0 or 1. However, in the general formula (LC3-b), the compounds represented by the general formula (i-1) and the general formula (ii) are excluded.)
As the general formula (LC3-b), it is preferable to represent the following general formulas (LC3-b1) to general formulas (LC3-b10).

(In the formula, ^RN11 and ^RN12 independently represent the same meanings as ^RN11 and ^RN12 in the general formula (N-1).)
The combination of ^RN11 and ^RN12 is not particularly limited, but both represent an alkyl group, both represent an alkenyl group, one represents an alkyl group and the other represents an alkenyl group, and one of them represents an alkenyl group. It is preferable that one represents an alkyl group and the other represents an alkoxy, and one of them represents an alkyl group and the other represents an alkenyloxy group, both of which represent an alkyl group, and both of which represent an alkenyl group. It is more preferable that it represents.
Further, as the general formula (LC3-b), it is preferable to represent the following general formula (LC3-c).

(In the formula, ^RN11 and ^RN12 independently represent the same meanings as ^RN11 and ^RN12 in the general formula (N-1).)
The compound represented by the general formula (N-2) is preferably a compound selected from the compound group represented by the general formulas (N-2-1) to (N-2-3).

(In the formula, ^RN211 and ^RN22 independently represent the same meanings as ^RN211 and ^RN22 in the general formula (N-2).)
The compound represented by the general formula (N-3) is preferably a compound selected from the compound group represented by the general formulas (N-3-1) and (N-3-2).

(In the formula, ^RN31 and ^RN32 independently represent the same meanings as ^RN31 and ^RN32 in the general formula (N-3).)
<Third aspect of the compound represented by the general formula (II)>
The fourth component is a so-called non-polar 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 almost neutral compound (value of Δε is -2 to 2).

(In the formula, ^RL1 and ^RL2 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent _−CH2- in the alkyl group are independent of each other. It may be substituted with -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-.
n ^L1 represents 0, 1, 2 or 3
A ^L1 , A ^L2 and A ^L3 are independently (a) 1,4-cyclohexylene groups (one -CH _2- or two non-adjacent -CH ₂ -existing in this group are It may be replaced with -O-.)
(B) 1,4-phenylene group (one -CH = existing in this group or two non-adjacent -CH = may be replaced with -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, One -CH = present in the 3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be replaced with -N =).
Represents a group selected from the group consisting of, and the hydrogen atom in the above group (a), group (b) and group (c) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom, respectively. ,
Z ^L1 and Z ^L2 are independently single-bonded, -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-
If n ^L1 is 2 or 3 and there are a plurality of A ^L2s , they may be the same or different, and if n ^L1 is 2 or 3 and there are a plurality of Z ^L3s , they may be the same or different. May be the same or different, except for compounds represented by the general formula (J), the general formula (N-1), the general formula (N-2) and the general formula (N-3). )

The compound represented by the general formula (L) may be used alone or in combination. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The type of compound used is, for example, one type 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, and ten. More than a kind.
In the composition of the present invention, the content of the compound represented by the general formula (L) is solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and the like. It is necessary to make appropriate adjustments according to the 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%, and 30. %, 40%, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, and 25%.
When a composition having a low viscosity and a high response rate is required, it is preferable that the above lower limit value is high and the upper limit value is high. Further, when a composition having a high Tni of the composition of the present invention and having good temperature stability is required, it is preferable that the above lower limit value is high and the upper limit value is high. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable that the above lower limit value is low and the upper limit value is low.
Both ^RL1 and ^RL2 are preferably alkyl groups when reliability is important, and alkoxy groups are preferable when reducing the volatility of the compound is important, and reduction of viscosity is important. If so, it is preferable that at least one of them is an alkenyl group.

^RL1 and ^RL2 are linear alkyl groups having 1 to 5 carbon atoms and linear carbon atoms 1 to 4 when the ring structure to which they are bonded is a phenyl group (aromatic). The alkoxy group and the alkenyl group having 4 to 5 carbon atoms are preferable, and when the ring structure to which the alkoxy group is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, the linear carbon atom number is 1 to 5. Alkoxy groups, linear alkoxy groups having 1 to 4 carbon atoms and linear alkenyl groups having 2 to 5 carbon atoms are preferable. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if any, is preferably 5 or less, and is preferably linear.
The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5). (The black dots in each equation represent carbon atoms in the ring structure.)

Above all, the voltage retention rate (VHR) can be improved by using a compound in which at least one or more of ^RL1 and ^RL2 represents an alkenyl group and a compound represented by the general formula (I) in combination. ..
n ^L1 is preferably 0 when the response speed is important, 2 or 3 is preferable for improving the upper limit temperature of the nematic phase, and 1 is preferable for balancing these. Further, in order to satisfy the properties required for the composition, it is preferable to combine compounds having different values.
^AL1 , ^AL2 and ^AL3 are preferably aromatic when it is required to increase Δn, and preferably aliphatic in order to improve the response rate, and each of them is independently trans-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 is preferable to represent a diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and it is more preferable to represent the following structure.

It is more preferable to represent a trans-1,4-cyclohexylene group or a 1,4-phenylene group.
Z ^L1 and Z ^L2 are preferably single bonds when 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, RL1 and ^RL2 independently represent the same meanings as ^RL1 and ^RL2 in the general formula ( ^L )).
As ^{RL11 and RL12 ,} 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 are preferable. .. The compound represented by the general formula (L-1) may be used alone, or may be used in combination of two or more compounds. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types as one embodiment of the present invention.

The lower limit of the preferred content is 1%, 2%, 3%, 5%, 7%, 10%, 15 with respect to the total amount of the composition of the present invention. %, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%. The preferred upper limit of the content is 95%, 90%, 85%, 80%, 75%, 70%, 65% with respect to the total amount of the composition of the present invention. %, 60%, 55%, 50%, 45%, 40%, 35%, 30%, 25%.
When a composition having a low viscosity and a high response rate is required, it is preferable that the above lower limit value is high and the upper limit value is high. Further, when a composition having a high Tni of the composition of the present invention and having good temperature stability is required, it is preferable that the lower limit value is moderate and the upper limit value is moderate. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable that the above 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).

(In the formula, ^RL11 represents a hydrogen atom or a methyl group, and RL2 represents the same meaning as ^RL2 in the general formula ( ^L ).)
The compound represented by the general formula (L-1-1) is a compound selected from the compound group represented by the formulas (L1-1.11) to (L-1-1.13). Is preferable, and it is preferable that it is a compound represented by the formula (L-1-1.12) or the formula (L-1-1.13), and in particular, it is represented by the formula (L-1-1.13). It is preferably a compound.

The compound represented by the general formula (L-1-1) is a compound selected from the compound group represented by the formulas (L1-1.21) to (L1-1.24). It is preferable that the compound is represented by the formulas (L-1-1.22) to (L1-1.24). In particular, the compound represented by the formula (L-1-1.22) is preferable because it particularly improves the response rate of the composition of the present invention. Further, when obtaining Tni higher than the response speed, it is preferable to use a compound represented by the formula (L1-1.23) or the formula (L1-1.24).

The compound represented by the general formula (L-1-1) is a compound selected from the compound group represented by the formula (L1-1.31) and the formula (L1-1.41). It is preferable to have.

また、一般式（Ｌ－１）で表される化合物は、一般式（Ｌ－１－２）で表される化合物であることが好ましい。

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

(In the formula, R ¹²¹ and R ¹²² independently represent 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 compound group represented by the formula (L-1-2-2.1) to the formula (L-2-1.12). Is preferable, and the compound represented by the formula (L-1-2.1), the formula (L-1-2.3) or the formula (L-1-2.4) is preferable. In particular, the compound represented by the formula (L-1-2.1) is preferable because it particularly improves the response rate of the composition of the present invention. Further, when obtaining Tni higher than the response speed, the formula (L-1-2.3), the formula (L-1-2.4), the formula (L-1-2.11) and the formula (L-) are obtained. It is preferable to use the compound represented by 1-2.12). Total 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 the above is not preferably 20% or more in order to improve the solubility at low temperature.

また、一般式（Ｌ－１）で表される化合物は、一般式（Ｌ－１－３）及び／又は（Ｌ－１－４）で表される化合物群から選ばれる化合物であることが好ましい。

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

(R ⁱⁱ³¹ and R ^{ii 41} in the formula independently represent the same meaning as R ⁱⁱ 2 in the general formula (L)).
Further, the compound represented by the general formula (L) is preferably a compound represented by the following general formulas (L-2) to (L-11). The liquid crystal composition of the present invention contains one or more compounds represented by the general formula (L-2) to the general formula (L-11) as the compound represented by the general formula (L). Is preferable.

(In the formula, ^RL31 and ^RL32 are an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and ^RL32 is an alkyl group having 1 to 5 carbon atoms and 1 carbon atom. Represents an alkoxyl group of 5, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms.)
The compound represented by the general formula (L) shall be a compound selected from the general formula (L-4), the general formula (L-6), the general formula (L-7) and the general formula (L-8). Is more preferable, and 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-) are more preferable. It is more preferable that the compound is selected from 8), and it is also preferable that the compound is selected from the general formula (L-6) and the general formula (L-8). More specifically, when a large Δn is required, it is preferably a compound selected from the general formula (L-6), the general formula (L-8) and the general formula (L-11).

Further, in the compounds represented by the general formula (L-4), the general formula (L-7) and the general formula (L-8), ^RL31 is an alkyl group having 1 to 5 carbon atoms or 2 carbon atoms. ^{RL32 is preferably an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms, and RL31 is} preferably an alkenyl group having 2 to 5 carbon atoms. Further preferably, it is further preferably an alkenyl group having 2 or 3 carbon atoms, and in the compound represented by the general formula (L-6), ^RL31 and ^RL32 independently have 1 to 5 carbon atoms, respectively. Is preferably an alkyl group or an alkenyl group having 2 to 5 carbon atoms.
Further, as the compound represented by the general formula (L), one or more compounds represented by the general formula (L-13), the general formula (L-14) or the general formula (L-15) are contained. It is also preferable to do so.

(In the formula, ^RL51 and ^RL52 independently represent 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, respectively, and X ^L51 and X ^L52 independently represents a fluorine atom or a hydrogen atom, and one of ^XL51 and ^XL52 is a fluorine atom and the other one is a hydrogen atom.)
Further, as the compound represented by the general formula (L), one or more compounds represented by the general formula (L-16.1) to the general formula (L-16.3) may be contained. ..

また、一般式（Ｌ）で表される化合物として、一般式（Ｎ－００１）で表される化合物を１種又は２種以上含有してもよい。

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

(In the formula, ^RN1 and ^RN2 independently have 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 an alkenyl group having 2 to 8 carbon atoms. Represents the alkoxyoxyl group of, L ¹ and L ² independently represent a hydrogen atom, a fluorine atom, CH ₃ or CF ₃ , except for those in which both L ¹ and L ² represent a fluorine atom.)
^RN1 and ^RN2 preferably represent an alkyl group having 1 to 5 carbon atoms.
The liquid crystal composition of the present invention preferably contains 50% or more, preferably 80% or more, as the lower limit of the total content of the compound represented by the general formula (II) in the composition. It is preferably contained in an amount of 85% or more, preferably 88% or more, preferably 90% or more, preferably 92% or more, preferably 95% or more, and 97% or more. It is preferable that the content is 98% or more, 99% or more is preferable, and substantially no other compound is contained. Further, as an upper limit value, it is preferably contained in an amount of 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. It is preferable not to do so. Substantially means excluding compounds unintentionally contained such as impurities that are inevitably generated during production.

The liquid crystal composition of the present invention preferably has a positive dielectric anisotropy (Δε) at 25 ° C, and has a dielectric anisotropy (Δε) of 1.5 to 20.0 at 25 ° C. It is preferable, 1.5 to 18.0 is more preferable, 1.5 to 15.0 is more preferable, 1.5 to 11 is further preferable, and 1.5 to 8 is particularly preferable.
The liquid crystal composition having a positive value of dielectric anisotropy (Δε) preferably contains a compound represented by the general formula (J) and a compound represented by the general formula (L). More specifically, it is preferable to contain 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) are contained. It is preferable to contain the compound represented by -2) and the 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) is contained in the composition. As the lower limit value, it is preferably contained in an amount of 5% or more, preferably 80% or more, preferably 85% or more, preferably 88% or more, and preferably 90% or more. It is preferably contained in an amount of 92% or more, preferably 95% or more, preferably 97% or more, preferably 98% or more, preferably 99% or more, and is substantially other. It is preferable that it does not contain a compound. Further, as an upper limit value, it is preferably contained in an amount of 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. It is preferable not to do so. Substantially means excluding compounds that unintentionally contain impurities and the like that are inevitably generated during production.

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) is contained in the composition. As the lower limit value, it is preferably contained in an amount of 5% or more, preferably 80% or more, preferably 85% or more, preferably 88% or more, and preferably 90% or more. It is preferably contained in an amount of 92% or more, preferably 95% or more, preferably 97% or more, preferably 98% or more, preferably 99% or more, and is substantially other. It is preferable that it does not contain a compound. Further, as an upper limit value, it is preferably contained in an amount of 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. It is preferable not to do so.

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-1) is the composition. As a lower limit value, it is preferably contained in a substance in an amount of 5% or more, preferably 10% or more, preferably 13% or more, preferably 15% or more, and preferably 18% or more. It is preferable to contain 20% or more, preferably 23% or more, preferably 25% or more, preferably 28% or more, preferably 30% or more, and 33% or more. It is preferably contained, preferably 35% or more, preferably 38% or more, and preferably 40% or more. Further, as an upper limit value, it is preferably contained in an amount of 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, and 68% or less. It is preferably contained in an amount of 65% or less, preferably in an amount of 63% or less, preferably in an amount of 60% or less, preferably in an amount of 55% or less, and preferably in an amount of 50% or less. It is preferably contained in an amount of 40% or less.

The liquid crystal composition of the present invention preferably has a dielectric anisotropy (Δε) having a negative value at 25 ° C., and has a dielectric anisotropy (Δε) of −2.0 to −8.0 at 25 ° C. It is preferably -2.0 to -6.0, more preferably -2.0 to -5.0, and particularly preferably -2.5 to -4.0.
The liquid crystal composition having a negative dielectric constant anisotropy (Δε) is a compound represented by the general formula (N-1) to the general formula (N-3) and a compound represented by the general formula (L). Is preferably contained. More specifically, it is preferable to contain a compound represented by the general formula (N-1) and a compound represented by the general formula (L-1), and a compound represented by the general formula (N-1). And it is preferable to contain a compound represented by the general formula (L-1-1).

The liquid crystal composition of the present invention is a compound represented by the general formula (I), a compound represented by the general formula (N-1) to the general formula (N-3), and a compound represented by the general formula (L). The total content of the above is preferably 5% or more, preferably 80% or more, preferably 85% or more, and preferably 88% or more as the lower limit value in the composition. , 90% or more, preferably 92% or more, 95% or more, 97% or more, 98% or more, 99% or more. It is preferable that the compound is substantially free of other compounds. Further, as an upper limit value, it is preferably contained in an amount of 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. It is preferable not to do so.

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 (N-1) and the compound represented by the general formula (L) is the composition. As the lower limit value, it is preferably contained in the product in an amount of 5% or more, preferably 80% or more, preferably 85% or more, preferably 88% or more, and 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, and substantially. It is preferable that it does not contain other compounds. Further, as an upper limit value, it is preferably contained in an amount of 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. It is preferable not to do so.

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-1) is the composition. As a lower limit value, it is preferably contained in a substance in an amount of 5% or more, preferably 10% or more, preferably 13% or more, preferably 15% or more, and preferably 18% or more. It is preferable to contain 20% or more, preferably 23% or more, preferably 25% or more, preferably 28% or more, preferably 30% or more, and 33% or more. It is preferably contained, preferably 35% or more, preferably 38% or more, and preferably 40% or more. Further, as an upper limit value, it is preferably contained in an amount of 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, and 68% or less. It is preferably contained in an amount of 65% or less, preferably in an amount of 63% or less, preferably in an amount of 60% or less, preferably in an amount of 55% or less, and preferably in an amount of 50% or less. It is preferably contained in an amount of 40% or less.

The liquid crystal composition of the present invention has a refractive index anisotropy (Δn) of 0.08 to 0.14 at 25 ° C., more preferably 0.09 to 0.13, and more preferably 0.09 to 0.12. Especially preferable. 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.
In addition to the above-mentioned compounds, the liquid crystal composition of the present invention includes ordinary nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers, or light stabilizers (HALS) other than the present invention. ) Etc. may be contained.

For example, the liquid crystal composition of the present invention may contain a liquid crystal compound having a dielectric constant 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% by mass to 50% by mass, preferably 1% by mass to 30% by mass, preferably 3% by mass to 30% by mass, and 5% by mass to 20% by mass. Is preferable.
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 are used. The above may be contained. 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 a polymerizable property with light.
Among the polymerizable compounds having a reactive group, the polymerizable compound having a monofunctional reactive group is specifically represented by the following general formula (VI).

(In the formula, X ³ represents a hydrogen atom or a methyl group, Sp ³ is a single bond, an alkylene group having 1 to 8 carbon atoms or —O— (CH ₂ ) _t − (in the formula, t is 2 to It represents an integer of 7, and the oxygen atom shall be bonded to the aromatic ring.), Where V is a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a polyvalent ring having 5 to 30 carbon atoms. Although it represents a substituent, the alkylene group in the polyvalent alkylene group may be substituted with an oxygen atom within a range in which oxygen atoms are not adjacent to each other, and an 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 non-adjacent range) or with a cyclic substituent, where W represents a hydrogen atom, a halogen atom or an alkylene group having 1 to 8 carbon atoms). The represented polymerizable compound is preferable.
In the above general formula (VI) ^, X3 represents a hydrogen atom or a methyl group, but a hydrogen atom is preferable when the reaction rate is important, and a methyl group is used when reducing the reaction residual amount is important. preferable.
In the above general formula (VI), Sp ³ represents a single bond, an alkylene group having 1 to 8 carbon atoms or -O- (CH ₂ ) _t- (in the formula, t represents an integer of 2 to 7 and is an oxygen atom. Represents), but the carbon chain is preferably not very 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 preferable. An alkylene group is more preferred. Further, when Sp ³ represents —O— (CH ₂ ) _t −, t is preferably 1 to 5, more preferably 1 to 3.

In the above 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 is an alkylene group in the polyvalent alkylene group. May be substituted with an oxygen atom in a range in which the oxygen atom is not adjacent, or an alkyl group having 5 to 20 carbon atoms (the alkylene group in the group may be substituted with an oxygen atom in a range in which the oxygen atom is not adjacent to each other. ) Or may be substituted with a cyclic substituent, preferably substituted with two or more cyclic substituents.
More specifically, the polymerizable compound represented by the general formula (VI) has the general formula (X1a).

(In the formula, A ¹ represents a hydrogen atom or a methyl group, and represents
A ² is 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 independent oxygen atoms, assuming that the oxygen atoms are not directly bonded to each other. It may be substituted with -CO-, -COO- or -OCO-, and one or more hydrogen atoms in the alkylene group are independently substituted with a fluorine atom, a methyl group or an ethyl group, respectively. May be.)
A ³ and A ⁶ are independent hydrogen atoms, halogen atoms, or alkyl groups having 1 to 10 carbon atoms (one or two or more methylene groups in the alkyl groups do not directly bond oxygen atoms to each other. As such, they may be independently substituted with an oxygen atom, -CO-, -COO- or -OCO-, and one or more hydrogen atoms in the alkyl group are independently halogenated. It may be substituted with an atom or an alkyl group having 1 to 17 carbon atoms.)
A ⁴ and A ⁷ are independent hydrogen atoms, halogen atoms, or alkyl groups having 1 to 10 carbon atoms (one or two or more methylene groups in the alkyl groups do not directly bond oxygen atoms to each other. As such, they may be independently substituted with an oxygen atom, -CO-, -COO- or -OCO-, and one or more hydrogen atoms in the alkyl group are independently halogenated. It may be substituted with an atom or an alkyl group having 1 to 9 carbon atoms.)
p represents 1 to 10 and represents
B ¹ , B ² and B ³ are independently hydrogen atoms and linear or branched alkyl groups having 1 to 10 carbon atoms (one or two or more methylene groups in the alkyl groups are used. , The oxygen atoms may be independently substituted with an oxygen atom, -CO-, -COO- or -OCO-, assuming that they do not directly bond to each other, and one or more of the alkyl groups. The hydrogen atom may be independently substituted with a halogen atom or a trialkylsilyl group having 3 to 6 carbon atoms.)
Further, the polymerizable compound represented by the general formula (VI) is specifically represented by the general formula (X1b).

（式中、Ａ^８は水素原子又はメチル基を表し、
６員環Ｔ^１、Ｔ^２及びＴ^３はそれぞれ独立して

( ^In the formula, A8 represents a hydrogen atom or a methyl group, and represents
The 6-membered rings T ¹ , T ² and T ³ are independent of each other.

(However, q represents an integer from 1 to 4).
q represents 0 or 1 and represents
Y ¹ and Y ² are independently single-bonded, -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 = CH CH ₂ CH _2- or -CH ₂ CH ₂ CH = CH-, representing
Y ³ represents a single bond, -COO- or -OCO-,
B ⁸ represents a hydrocarbon group having 1 to 18 carbon atoms. ) Can also be mentioned.
Further, the polymerizable compound represented by the general formula (VI) is specifically represented by the general formula (X1c).

(In the formula, R ⁷⁰ represents a hydrogen atom or a methyl group, and R ⁷¹ represents a hydrocarbon group having a condensed ring.) Examples thereof include compounds represented by.
Further, among the polymerizable compounds having a reactive group, the polymerizable compound having a polyfunctional reactive group is described in the following general formula (VII).

(In the formula, X ¹ and X ² independently represent a hydrogen atom or a methyl group, and Sp ¹ and Sp ² independently represent a single bond, an alkylene group having 1 to 8 carbon atoms or —O—. (CH ₂ ) represents _s- (in the formula, s represents an integer of 2 to 7 and the oxygen atom is bonded to the aromatic ring), and U represents a linear or branched number of carbon atoms 2 to 20. It 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 oxygen atoms are not adjacent to each other, and the number of carbon atoms is 5. It may be substituted with an alkyl group of up to 20 (the alkylene group in the group may be substituted with an oxygen atom to the extent that the oxygen atom is not adjacent to each other) or a cyclic substituent, and k is an integer of 1 to 5. The polymerizable compound represented by) is preferable.
In the above general formula (VII), X ¹ and X ² independently represent a hydrogen atom or a methyl group, but when the reaction rate is important, the hydrogen atom is preferable, and it is important to reduce the reaction residual amount. If this is the case, a methyl group is preferable.

In the above general formula (VII), Sp ¹ and Sp ² are independently single bonds, an alkylene group having 1 to 8 carbon atoms or —O— (CH ₂ ) _s − (in the formula, s is 2 to 7). The oxygen atom represents an aromatic ring), but the carbon chain is preferably not very 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 preferable. 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. It is more preferable that there is a single bond, and it is particularly preferable that both are single bonds.
In the above 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 is an alkylene group in the polyvalent alkylene group. May be substituted with an oxygen atom in a range in which the oxygen atom is not adjacent, or an alkyl group having 5 to 20 carbon atoms (the alkylene group in the group may be substituted with an oxygen atom in a range in which the oxygen atom is not adjacent to each other). ), May be substituted with a cyclic substituent, preferably substituted with two or more cyclic substituents.
In the above general formula (VII), specifically, it is preferable that U represents the formula (VII-1) to the formula (VII-5) below, and the formula (VII-1) to the formula (VII-3) are expressed. It is more preferable to represent it, 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, it is preferable that at least one of Sp ¹ and Sp ² represents a single bond, and it is also preferable that both are single bonds.
In the above general formula (VII), k represents an integer of 1 to 5, but it is preferably a bifunctional compound in which k is 1, or a trifunctional compound in which k is 2, and more preferably a bifunctional compound. ..
More specifically, the general formula (P)

It is preferable to contain one or more polymerizable compounds represented by.
In the general formula (P), X ²⁰¹ and X ²⁰² each independently represent a hydrogen atom, a methyl group, or -CF ₃ groups. As X ²⁰¹ and X ²⁰² , a diacrylate derivative having a hydrogen atom and a dimethacrylate derivative having a methyl group are preferable, and a compound having one hydrogen atom and the other methyl group is also preferable. A preferable compound can be used depending on the application, but in the PSA display device, 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 are independently single-bonded, an alkylene group having 1 to 8 carbon atoms or —O— (CH ₂ ) _s − (in the formula, s is 2 to 7). Represents an integer of, and the oxygen atom shall be bonded to the ring.) In the PSA type liquid crystal display element, it is preferable that at least one of Sp ²⁰¹ and Sp ²⁰² is a single bond, and both are a compound having a single bond or an alkylene having a single bond and the other having 1 to 8 carbon atoms. The group is preferably —O— (CH ₂ ) _s −, in this case an alkylene group having 1 to 4 carbon atoms is preferable, and s is preferably 1 to 4.

In the general formula (P), M ²⁰¹ , M ²⁰² and M ²⁰³ each independently have a trans-1,4-cyclohexylene group (one in the group or two or more non-adjacent _—CH2- ). -O- or -S- may be substituted), 1,4-phenylene group (one in the group or two or more non-adjacent -CH = may be substituted by -N =. Good.), 1,4-Cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene- It represents a 2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and the hydrogen atoms in the group are independently fluorine atoms, -CF ₃ groups, and the number of carbon atoms. It may be substituted with either an alkyl group of 1 to 10, an alkoxyl group having 1 to 10 carbon atoms, or a formula (R-1) to a formula (R-15).

In the general formula (P), Z ²⁰¹ and Z ²⁰² are independently -OCH _2- , -CH ₂ O-, -COO-, -OCO-, -CF ₂ O-, -OCF ₂ -,-, respectively. 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- (In the equation, Y ¹ and Y ² independently represent a fluorine atom or a hydrogen atom), -C≡C- or a single bond. , -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-, -C≡C- or single bond is preferred, -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 preferred.
In the general formula (P), n ²⁰¹ represents 0, 1 or 2, but 0 or 1 is preferable. However, when a plurality of M ²⁰² and Z ²⁰² exist, they may be different or the same.
It may contain at least one polymerizable compound represented by the general formula (P), preferably 1 to 5 types, and further 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 preferable to have.
More specifically, when n ²⁰¹ is 0 in the general formula (P), the ring structure between Sp ²⁰¹ and Sp ²⁰² is preferably from formula (XXa-1) to formula (XXa-5). The formula (XXa-1) to the formula (XXa-3) is more preferable, and the formula (XXa-1) or the formula (XXa-2) is particularly preferable. However, both ends of the equation shall be coupled to Sp ²⁰¹ or Sp ²⁰² .

The polymerizable compound represented by the general formula (P) containing these skeletons has the optimum orientation regulating force after polymerization for a PSA type liquid crystal display device, and a good orientation state can be obtained, so that display unevenness is suppressed. There is an effect that is done or does not occur at all.
From the above, as the polymerizable monomer, a compound represented by the formula (XX-1) to the general formula (XX-10) is preferable, and the formula (XX-1) to the formula (XX-4) is more preferable.

From the formula (XX-1) to the general formula (XX-10), Sp ^xx is an alkylene group having 1 to 8 carbon atoms or -O- (CH ₂ ) _s- (in the formula, s is an integer from 2 to 7). It represents, and the oxygen atom is assumed to be bonded to the ring.).
From the formula (XX-1) to the general formula (XX-10), the hydrogen atom in the 1,4-phenylene group is further added to -F, -Cl, -CF ₃ , -CH ₃ , and formula (R-1). May be replaced by any of the formulas (R-15).
When n ²⁰¹ is 1 in the general formula (P), for example, a polymerizable compound such as the formulas (P31) to (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 formulated from -F, -Cl, -CF ₃ , -CH ₃ , and the formula (R-1). It may be replaced by any of (R-15).
The polymerizable compound represented by the general formula (P) containing these skeletons has the optimum orientation regulating force after polymerization for a PSA type liquid crystal display device, and a good orientation state can be obtained, so that display unevenness is suppressed. There is an effect that is done or does not occur at all.
When n ²⁰¹ is 1 in the general formula (P) and it has a plurality of formulas (R-1) or (R-2), for example, a polymerizable compound such as the formulas (P301) to the formula (P316) can be used. preferable.

The hydrogen atoms in the 1,4-phenylene group and the naphthalene group in the formula (P301) to the formula (P316) may be further substituted with —F, —Cl, _—CF3 , _—CH3 .
As the polymerizable compound represented by the general formula (P), for example, polymerizable compounds represented by the formulas (Ia-1) to (Ia-31) are also preferable.

また、酸化防止剤は、一般式（Ｈ－１）から一般式（Ｈ－４）で表されるヒンダードフェノールが好ましい。

Further, as the antioxidant, hindered phenol represented by the general formula (H-1) to the general formula (H-4) is preferable.

From the general formula (H-1) to the general formula (H-4), ^RH1 is 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 an alkenyl group having 2 to 10 carbon atoms. Represents an alkoxyoxy group having 2 to 10 carbon atoms, but one -CH _2- or two or more non-adjacent-CH ₂ -existing in the group is independently -O- or -S-. Also, one or more hydrogen atoms present in the group may be independently substituted with a fluorine atom or a chlorine atom, respectively. More specifically, it may be 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. It is more preferable that it is an alkyl group having 3 to 7 carbon atoms or an alkenyl group having 2 to 7 carbon atoms.
In the general formula (H-4), ^MH4 is an alkylene group having 1 to 15 carbon atoms (one or two or more -CH _2- in the alkylene group is-so that oxygen atoms are not directly adjacent to each other-. It may be replaced with O-, -CO-, -COO-, -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, 1,4-phenylene group (any hydrogen atom in the 1,4-phenylene group may be substituted with a fluorine atom) or trans-1,4-cyclohexylene group. Although it is represented, it is preferably an alkylene group having 1 to 14 carbon atoms, and a large number of carbon atoms is preferable in consideration of volatileness, but it is preferable that the number of carbon atoms is not too large in consideration of viscosity. The number of carbon atoms is more preferably 2 to 12, the number of carbon atoms is 3 to 10, the number of carbon atoms is 4 to 10, the number of carbon atoms is 5 to 10, and the number of carbon atoms is 6 to 10.

In the general formula (H-1) to the general formula (H-4), one in the 1,4-phenylene group or two or more non-adjacent -CH = may be substituted with -N =. Further, the hydrogen atom in the 1,4-phenylene group may be independently substituted with a fluorine atom or a chlorine atom.
From the general formula (H-1) to the general formula (H-4), one in the 1,4-cyclohexylene group or two or more non-adjacent -CH ₂ -s are substituted with -O- or -S-. It may have been done. Further, the hydrogen atom in the 1,4-cyclohexylene group may be independently substituted with a fluorine atom or a chlorine atom.
More specifically, for example, formulas (H-11) to formulas (H-15) can be mentioned.

The liquid crystal composition of the present invention may contain 1% by mass or more of the antioxidant, but preferably 10% by mass or more, preferably 20% by mass or more, and preferably 50% by mass or more. The upper limit of the content of the antioxidant is 10,000 mass ppm, but 1000 mass ppm is preferable, 500 mass ppm is preferable, and 100 mass ppm is preferable.
The liquid crystal display element using the liquid crystal composition of the present invention has no or suppressed display defects, has excellent display quality, and has a high response speed. In particular, as an active matrix-driven 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.
Further, 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 under or without a voltage. A liquid crystal display element such as PSA type, TN type, OCB type, ECB type, IPS type, FFS type or VA-IPS type can be provided.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Further, "%" in the compositions of the following Examples and Comparative Examples means "% by mass". The phase transition temperature was measured using a polarizing microscope equipped with a temperature control stage and a differential scanning calorimeter (DSC).
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-V-CH = CH ₂
V-CH ₂ = CH-
Vn-CH ₂ = CH- (CH ₂ ) _n-
(Connecting group)
-CFFO- CF ₂ -O-
-1O-CH ₂ -O-
-O1--O-CH _2-
(Ring structure)

Further, as the compound represented by the general formula (I), the compound (I-1) represented by the following formula (manufactured by Wako Pure Chemical Industries, Ltd.) was used.

The measured characteristics of the composition examples in the examples are as follows.
T _ni : Nematic phase-isotropic liquid phase transition temperature (° C)
Δn: Refractive index anisotropy at 25 ° C. Δε: Dielectric constant anisotropy at 25 ° C. γ ₁ : Rotational viscosity at 25 ° C. (mPa · s)
VHR (UV): Voltage retention rate (%) (1V, 60Hz, 60 ° C.) after irradiation with UV of 150 (J) with a high-pressure mercury lamp. However, the illuminance was 365 nm and 100 mW / cm ² .

(Comparative Example 1, Example 1)
The following LC-A liquid crystal composition was prepared and its physical characteristics were measured. Table 1 shows the composition of the liquid crystal composition and the results of its physical property values.

また、以下のＬＣ－Ｂの液晶組成物を調製し、その物性値を測定した。液晶組成物の構成とその物性値の結果は表２のとおりであった。

Moreover, the following liquid crystal composition of LC-B was prepared, and the physical characteristic value thereof was measured. Table 2 shows the composition of the liquid crystal composition and the results of its physical property values.

As Example 1, a liquid crystal composition LC-1 containing 99.9% of the liquid crystal composition LC-A and 0.1% of the compound (I-1) was prepared. Further, as Example 2, a liquid crystal composition LC-2 containing 99.95% of the above liquid crystal composition LC-B and 0.05% of the compound (I-1) was prepared. Further, a liquid crystal composition containing 100% of the liquid crystal composition LC-A was designated as Comparative Example 1. The results of VHR (UV) are shown in Table 3.

It was confirmed that Example 1 and Example 2 showed a sufficiently higher VHR (UV) than Comparative Example 1.

Claims (8)

The following general formula (I)

[In the formula, R independently represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. ]
Contains one or more compounds selected from the group consisting of the compounds represented by
Furthermore, the following general formula (II)

[In the formula, 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 independently -CH = CH-,-, respectively. It may be substituted with C≡C-, -O-, -CO-, -COO- or -OCO-.
A ^II1 and A ^II2 are independent of each other.
(A) 1,4-Cyclohexylene group (one -CH _2- or two non-adjacent _-CH 2- existing in this group may be replaced with -O-).
(B) A 1,4-phenylene group (one -CH = existing in this group or two non-adjacent -CH = may be replaced with -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 One -CH = present in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be replaced with -N =. )
Represents a group selected from the group consisting of, and the hydrogen atom in the above group (a), group (b) and group (c) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom, respectively. ,
Z ^II1 is 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 of the alkyl groups or two or more non-adjacent −CH2 −s _are independent of each other. It may be substituted with -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-, and one or more hydrogens in the alkyl group. Atoms may be substituted with fluorine atoms,
Although m ^II1 represents 1, 2, 3 or 4, when m ^II1 represents 2, 3 or 4, a plurality of A ^II1 and Z ^II1 may be the same or different. ]
Contains two or more compounds represented by
The compounds represented by the general formula (II) are the following general formulas (i-1) and (L-1-1).

[In the formula, A ⁱ¹¹ , A ⁱ¹² and A ⁱ¹³ each independently represent a 1,4-cyclohexylene group or a 1,4-phenylene group, but one present in the 1,4-cyclohexylene group. -CH _2- or two non-adjacent -CH _2- may be replaced with -O- or -S-, and one hydrogen atom present in the 1,4-phenylene group is independent of each other. Then , it may be replaced with a fluorine atom or a chlorine atom, and Z ⁱ¹ is -OCH _2- , -CH ₂ O-, -CF ₂ O-, -OCF _2- , -CH ₂ CH _2- or -CF ₂ CF. _2- , ^mi11 and ^mi12 independently represent 0 or 1, respectively , and ^RN11 and ^RN12 each independently represent an alkyl group having 1 to 8 carbon atoms, and 1 in the alkyl group. Two or more -CH ₂ -s or non-adjacent ones are independently substituted with -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. Also, Z ^N12 is a single bond -CH ₂ CH ₂ -,-(CH ₂ ) _4- , -OCH _2- , -CH ₂ O-, -COO-, -OCO-, -OCF _2- , -CF ₂ Represents O-, -CH = NN = CH-, -CH = CH-, -CF = CF- or -C≡C-]

[In the formula, ^RL11 represents a hydrogen atom or a methyl group, RL2 represents ^an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent −CH2- in the alkyl group _represents . They may be independently substituted with -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-].
A liquid crystal composition containing one or more compounds represented by . The liquid crystal composition according to claim 1, wherein the dielectric anisotropy (Δε) at 25 ° C. has a negative value. The liquid crystal composition according to claim 1, wherein the dielectric anisotropy (Δε) at 25 ° C. has a positive value. The invention according to any one of claims 1 to 3 , wherein the total content of the compound selected from the group consisting of the compounds represented by the general formula (I) is 0.05% by mass to 5% by mass in the liquid crystal composition. Liquid crystal composition. The liquid crystal composition according to any one of claims 1 to 4 , wherein the total content of the compound represented by the general formula (II) is 10% by mass to 90% by mass in the liquid crystal composition. The refractive index anisotropy (Δn) at 25 ° C is in the range of 0.08 to 0.14, the rotational viscosity (γ1) at 25 ° C is in the range of 60 to 130 mPa · s, and the nematic phase-isotropic liquid. The liquid crystal composition according to any one of claims 1 to 5 , wherein the phase transition temperature (T _ni ) is in the range of 60 ° C to 120 ° C. The liquid crystal composition according to any one of claims 1 to 6 , which contains one kind or two or more kinds of a polymerizable compound and / or an antioxidant. A liquid crystal display element using the liquid crystal composition according to any one of claims 1 to 7 .