JP2019189771A - Liquid crystal composition and liquid crystal display element - Google Patents

Abstract

To provide a liquid crystal composition satisfying at least one of demands for characteristics such as a high maximum temperature, low minimum temperature, small viscosity, appropriate optical anisotropy, large dielectric anisotropy, large specific resistance, high stability to light and high stability to heat or having an appropriate balance in at least two of the characteristics, and an AM element comprising the composition.SOLUTION: The liquid crystal composition contains at least one compound as a first additive selected from a compound represented by formula (S) and a compound derived from a compound represented by formula (S) by replacing at least one hydrogen with a monovalent group, and may contain a specific compound having a large positive dielectric anisotropy as a first component, a specific compound having a high maximum temperature or a small viscosity as a second component, or a specific compound having a large negative dielectric anisotropy as a third component.SELECTED DRAWING: None

Description

  The present invention relates to a liquid crystal composition, a liquid crystal display device containing the composition, and the like. In particular, the present invention relates to a liquid crystal composition having a positive dielectric anisotropy and an AM (active matrix) device containing this composition and having a TN, ECB, OCB, IPS, FFS, or FPA mode.

  In the liquid crystal display element, the classification based on the operation mode of liquid crystal molecules is as follows: PC (phase change), TN (twisted nematic), STN (super twisted nematic), ECB (electrically controlled birefringence), OCB (optically compensated bend), IPS. Modes such as (in-plane switching), VA (vertical alignment), FFS (fringe field switching), and FPA (field-induced photo-reactive alignment). The classification based on the element driving method is PM (passive matrix) and AM (active matrix). PM is classified into static, multiplex, etc., and AM is classified into TFT (thin film transistor), MIM (metal insulator metal), and the like. TFTs are classified into amorphous silicon and polycrystalline silicon. The latter is classified into a high temperature type and a low temperature type according to the manufacturing process. The classification based on the light source includes a reflection type using natural light, a transmission type using backlight, and a semi-transmission type using both natural light and backlight.

  The liquid crystal display element contains a liquid crystal composition having a nematic phase. This composition has suitable properties. By improving the characteristics of the composition, an AM device having good characteristics can be obtained. The relationships in these properties are summarized in Table 1 below. The characteristics of the composition will be further described based on a commercially available AM device. The temperature range of the nematic phase is related to the temperature range in which the device can be used. A preferred maximum temperature of the nematic phase is about 70 ° C. or more, and a preferred minimum temperature of the nematic phase is about −10 ° C. or less. The viscosity of the composition is related to the response time of the device. A short response time is preferred for displaying moving images on the device. A shorter response time is desirable even at 1 millisecond. Therefore, a small viscosity in the composition is preferred. A small viscosity at low temperatures is even more preferred. The elastic constant of the composition is related to the contrast of the device. In order to increase the contrast in the device, a large elastic constant in the composition is more preferable.

  The optical anisotropy of the composition is related to the contrast ratio of the device. Depending on the mode of the device, a large optical anisotropy or a small optical anisotropy, ie an appropriate optical anisotropy is required. The product (Δn × d) of the optical anisotropy (Δn) of the composition and the cell gap (d) of the device is designed to maximize the contrast ratio. The appropriate value for the product depends on the type of operating mode. For a device with a mode such as TN, a suitable value is about 0.45 μm. In this case, a composition having a large optical anisotropy is preferable for a device having a small cell gap. A large dielectric anisotropy in the composition contributes to a low threshold voltage, a small power consumption and a large contrast ratio in the device. Therefore, a large dielectric anisotropy is preferable. A large specific resistance in the composition contributes to a large voltage holding ratio and a large contrast ratio in the device. Therefore, a composition having a large specific resistance not only at room temperature but also at a temperature close to the upper limit temperature of the nematic phase in the initial stage is preferable. A composition having a large specific resistance not only at room temperature but also at a temperature close to the upper limit temperature of the nematic phase after being used for a long time is preferable. The stability of the composition against light and heat is related to the lifetime of the liquid crystal display device. When their stability is high, the lifetime of the device is long. Such characteristics are preferable for an AM device used for a liquid crystal monitor, a liquid crystal television, and the like.

  In an AM device having a TN mode, a composition having a positive dielectric anisotropy is used. A composition having a negative dielectric anisotropy is used in an AM device having a VA mode. In an AM device having an IPS mode or an FFS mode, a composition having a positive or negative dielectric anisotropy is used. In a polymer sustained alignment (PSA) type AM device, a composition having positive or negative dielectric anisotropy is used.

JP 2010-60981A International Publication No. 2009/107405

  The object of the present invention is to provide a high maximum temperature of the nematic phase, a low minimum temperature of the nematic phase, a small viscosity, a suitable optical anisotropy, a large dielectric anisotropy, a large specific resistance, a high stability to light, and a high heat. The object is to provide a liquid crystal composition satisfying at least one of characteristics such as stability and a large elastic constant. Another challenge is to provide a liquid crystal composition that has an appropriate balance between at least two of these properties. Another object is to provide a liquid crystal display device containing such a composition. Another object is to provide an AM device having characteristics such as a short response time, a large voltage holding ratio, a low threshold voltage, a large contrast ratio, and a long lifetime.

In the present invention, as a first additive, a compound represented by formula (S) and a compound in which at least one hydrogen is replaced with a monovalent group excluding hydrogen of a hydroxyl group of the compound represented by formula (S) The present invention relates to a liquid crystal composition containing at least one compound selected from the group consisting of a nematic phase and a positive dielectric anisotropy, and a liquid crystal display device containing the composition.

  Advantages of the present invention include a high maximum temperature of the nematic phase, a low minimum temperature of the nematic phase, a small viscosity, a suitable optical anisotropy, a large dielectric anisotropy, a large specific resistance, a high stability against light, and a high heat resistance. The object is to provide a liquid crystal composition satisfying at least one of characteristics such as stability and a large elastic constant. Another advantage is to provide a liquid crystal composition having an appropriate balance between at least two of these properties. Another advantage is to provide a liquid crystal display device containing such a composition. Another advantage is to provide an AM device having characteristics such as a short response time, a large voltage holding ratio, a low threshold voltage, a large contrast ratio, and a long lifetime.

  Terms used in this specification are as follows. The terms “liquid crystal composition” and “liquid crystal display element” may be abbreviated as “composition” and “element”, respectively. “Liquid crystal display element” is a general term for liquid crystal display panels and liquid crystal display modules. “Liquid crystal compound” is a compound having a liquid crystal phase such as a nematic phase and a smectic phase and does not have a liquid crystal phase, but for the purpose of adjusting characteristics such as the temperature range, viscosity, and dielectric anisotropy of the nematic phase. This is a general term for compounds mixed in the composition. This compound has, for example, a six-membered ring such as 1,4-cyclohexylene or 1,4-phenylene, and its molecule (liquid crystal molecule) is rod-like. The “polymerizable compound” is a compound added for the purpose of forming a polymer in the composition. Liquid crystal compounds having alkenyl are not classified as polymerizable compounds in that sense.

  The liquid crystal composition is prepared by mixing a plurality of liquid crystal compounds. Additives such as optically active compounds and polymerizable compounds are added to this liquid crystal composition as necessary. The ratio of the liquid crystal compound is represented by a mass percentage (% by mass) based on the mass of the liquid crystal composition not containing the additive even when the additive is added. The ratio of the additive is expressed as a mass percentage (% by mass) based on the mass of the liquid crystal composition not containing the additive. That is, the ratio of the liquid crystal compound and the additive is calculated based on the total mass of the liquid crystal compound.

  “Maximum temperature of nematic phase” may be abbreviated as “maximum temperature”. “Lower limit temperature of nematic phase” may be abbreviated as “lower limit temperature”. The expression “increasing dielectric anisotropy” means that when the composition has a positive dielectric anisotropy, the value increases positively, and the composition having a negative dielectric anisotropy When it is a thing, it means that the value increases negatively. "High voltage holding ratio" means that the device has a large voltage holding ratio not only at room temperature but also at a temperature close to the upper limit temperature in the initial stage, and a large voltage not only at room temperature but also at a temperature close to the upper limit temperature after long-term use. It means having a retention rate. The characteristics of the composition and the device may be examined by a aging test.

上記の化合物（１ｚ）を例にして説明する。式（１ｚ）において、六角形で囲んだαおよびβの記号はそれぞれ環αおよび環βに対応し、六員環、縮合環のような環を表す。添え字‘ｘ’が２のとき、２つの環αが存在する。２つの環αが表す２つの基は、同一であってもよく、または異なってもよい。このルールは、添え字‘ｘ’が２より大きいとき、任意の２つの環αに適用される。このルールは、結合基Ｚのような、他の記号にも適用される。環βの一辺を横切る斜線は、環β上の任意の水素が置換基（−Ｓｐ−Ｐ）で置き換えられてもよいことを表す。添え字‘ｙ’は置き換えられた置換基の数を示す。添え字‘ｙ’が０のとき、そのような置き換えはない。添え字‘ｙ’が２以上のとき、環β上には複数の置換基（−Ｓｐ−Ｐ）が存在する。この場合にも、「同一であってもよく、または異なってもよい」のルールが適用される。なお、このルールは、Ｒａの記号を複数の化合物に用いた場合にも適用される。

The above compound (1z) will be described as an example. In the formula (1z), the symbols α and β surrounded by hexagons correspond to the rings α and β, respectively, and represent a ring such as a six-membered ring or a condensed ring. When the subscript 'x' is 2, there are two rings α. The two groups represented by the two rings α may be the same or different. This rule applies to any two rings α when the subscript 'x' is greater than 2. This rule also applies to other symbols such as the linking group Z. A diagonal line across one side of the ring β indicates that any hydrogen on the ring β may be replaced with a substituent (—Sp—P). The subscript “y” indicates the number of substituted substituents. When the subscript 'y' is 0, there is no such replacement. When the subscript “y” is 2 or more, a plurality of substituents (—Sp—P) exist on the ring β. Also in this case, the rule “may be the same or different” is applied. This rule also applies when the symbol of Ra is used for a plurality of compounds.

  In formula (1z), for example, an expression such as “Ra and Rb are alkyl, alkoxy, or alkenyl” means that Ra and Rb are independently selected from the group of alkyl, alkoxy, and alkenyl. Means. Here, the group represented by Ra and the group represented by Rb may be the same or different. This rule also applies when the symbol Ra is used for a plurality of compounds. This rule also applies when a plurality of Ras are used for one compound.

  At least one compound selected from the compounds represented by formula (1z) may be abbreviated as “compound (1z)”. “Compound (1z)” means one compound represented by the formula (1z), a mixture of two compounds, or a mixture of three or more compounds. The same applies to compounds represented by other formulas. The expression “at least one compound selected from compounds represented by formula (1z) and formula (2z)” means at least one compound selected from the group of compound (1z) and compound (2z) .

The expression “at least one 'A'” means that the number of 'A' is arbitrary. The expression “at least one 'A' may be replaced by 'B'” means that when the number of 'A' is one, the position of 'A' is arbitrary and the number of 'A' is 2 Even when there are more than two, their positions can be selected without restriction. The expression “at least one —CH ₂ — may be replaced by —O—” may be used. In this case, —CH ₂ —CH ₂ —CH ₂ — may be converted to —O—CH ₂ —O— by replacing non-adjacent —CH ₂ — with —O—. However, adjacent —CH ₂ — is not replaced by —O—. This replacement is -O-O-CH ₂ - is because (peroxide) is produced.

テトラヒドロピラン−２，５−ジイルのような二価基においても同様である。なお、好ましいテトラヒドロピラン−２，５−ジイルは、上限温度を上げるために右向き（Ｒ）である。カルボニルオキシのような結合基（−ＣＯＯ−または−ＯＣＯ−）も同様である。 The alkyl of the liquid crystal compound is linear or branched and does not include cyclic alkyl. Linear alkyl is preferred over branched alkyl. The same applies to terminal groups such as alkoxy and alkenyl. The configuration of 1,4-cyclohexylene is preferably trans rather than cis for increasing the maximum temperature. Since 2-fluoro-1,4-phenylene is asymmetrical, there are leftward (L) and rightward (R).

The same applies to a divalent group such as tetrahydropyran-2,5-diyl. Preferred tetrahydropyran-2,5-diyl is rightward (R) for increasing the maximum temperature. The same applies to a linking group such as carbonyloxy (—COO— or —OCO—).

  The present invention includes the following items.

Item 1. The first additive was selected from a compound represented by the formula (S) and a compound in which at least one hydrogen was replaced with a monovalent group, excluding the hydrogen of the hydroxyl group of the compound represented by the formula (S). A liquid crystal composition comprising at least one compound and having a nematic phase and positive dielectric anisotropy.

式（１）において、Ｒ^１ａ、Ｒ^１ｂ、およびＲ^１ｃは、水素、炭素数１から２０のアルキル、炭素数３から２０の脂環式炭化水素基、または炭素数６から２０の芳香族炭化水素基であり、これらの基において、少なくとも１つの−ＣＨ_２−は、−Ｏ−、−ＮＨ−、−ＣＯ−、−ＣＯＯ−、または−ＯＣＯ−で置き換えられてもよく、少なくとも１つの−ＣＨ_２−ＣＨ_２−は、−ＣＨ＝ＣＨ−または−Ｃ≡Ｃ−で置き換えられてもよく、これらの基において、少なくとも１つの水素は、炭素数１から１０のアルキル、炭素数１から１０のアルコキシ、またはハロゲンで置き換えられてもよく；ｎは、１、２、３、または４である。 Item 2. Item 2. The liquid crystal composition according to item 1, containing at least one compound selected from compounds represented by formula (1) as a first additive.

In Formula (1), R ^1a , R ^1b , and R ^1c are hydrogen, alkyl having 1 to 20 carbons, an alicyclic hydrocarbon group having 3 to 20 carbons, or aromatic carbonization having 6 to 20 carbons A hydrogen group in which at least one —CH ₂ — may be replaced by —O—, —NH—, —CO—, —COO—, or —OCO—, wherein at least one — CH ₂ —CH ₂ — may be replaced by —CH═CH— or —C≡C—, in which at least one hydrogen is alkyl having 1 to 10 carbons, 1 to 10 carbons. May be replaced by alkoxy, or halogen; n is 1, 2, 3, or 4.

式（１−１）から式（１−１０）において、Ｒ^１ｄは、水素または炭素数１から１５のアルキルであり、このアルキルにおいて、少なくとも１つの−ＣＨ_２−は、−Ｏ−、−ＮＨ−、−ＣＯ−、−ＣＯＯ−、または−ＯＣＯ−で置き換えられてもよく；Ｒ^１ｅおよびＲ^１ｆは、水素、炭素数１から１５のアルキル、または炭素数１から１５のアルコキシであり；Ｒ^１ｇは、水素または炭素数１から１５のアルキルであり；Ｒ^１ｈは、水素または炭素数１から１５のアルキルであり、このアルキルにおいて、少なくとも１つの−ＣＨ_２−は、−Ｏ−、−ＮＨ−、−ＣＯ−、−ＣＯＯ−、または−ＯＣＯ−で置き換えられてもよく；Ｒ^１ｉは、炭素数１から１０のアルキル、炭素数１から１０のアルコキシ、またはハロゲンであり；Ｚ^１ａ、Ｚ^１ｂ、およびＺ^１ｃは、単結合または炭素数１から５のアルキレンであり、このアルキレンにおいて、少なくとも１つの−ＣＨ_２−は、−Ｏ−で置き換えられてもよく、これらの基において、少なくとも１つの水素は、炭素数１から５のアルキルで置き換えられてもよく；ｍは、０、１、２、３、４、または５である。 Item 3. Item 3. The liquid crystal composition according to item 1 or 2, containing at least one compound selected from compounds represented by formulas (1-1) to (1-10) as a first additive.

In formulas (1-1) to (1-10), R ^1d is hydrogen or alkyl having 1 to 15 carbons, and in this alkyl, at least one —CH ₂ — is —O— or —NH. -, -CO-, -COO-, or -OCO- may be replaced; R ^1e and R ^1f are hydrogen, alkyl having 1 to 15 carbons, or alkoxy having 1 to 15 carbons; R ^{1 g} is hydrogen or alkyl having 1 to 15 carbons; R ^1h is hydrogen or alkyl having 1 to 15 carbons, in which at least one —CH ₂ — is —O—, —NH -, - CO -, - COO- , or may be replaced by ^{-OCO-; R 1i} is alkyl of 1 to 10 carbons, there 1 -C 10 alkoxy or halogen,; ^{Z 1} , ^{Z 1b} and ^{Z 1c,} is alkylene of 5 a single bond or 1 carbon atoms, in the alkylene, at least one -CH ₂ - may be replaced by -O-, in these groups, At least one hydrogen may be replaced by alkyl having 1 to 5 carbons; m is 0, 1, 2, 3, 4, or 5.

Item 4. Item 4. The liquid crystal composition according to any one of items 1 to 3, wherein the ratio of the first additive is in the range of 0.001% by mass to 2% by mass.

式（２）において、Ｒ^２ａは、炭素数１から１２のアルキル、炭素数１から１２のアルコキシ、または炭素数２から１２のアルケニルであり；環Ａは、１，４−シクロヘキシレン、１，４−フェニレン、２−フルオロ−１，４−フェニレン、２，３−ジフルオロ−１，４−フェニレン、２，６−ジフルオロ−１，４−フェニレン、ピリミジン−２，５−ジイル、１，３−ジオキサン−２，５−ジイル、またはテトラヒドロピラン−２，５−ジイルであり；Ｚ^２ａは、単結合、エチレン、ビニレン、カルボニルオキシ、またはジフルオロメチレンオキシであり；Ｘ^２ａおよびＸ^２ｂは、水素またはフッ素であり；Ｙ^２ａは、フッ素、塩素、少なくとも１つの水素がフッ素または塩素で置き換えられた炭素数１から１２のアルキル、少なくとも１つの水素がフッ素または塩素で置き換えられた炭素数１から１２のアルコキシ、または少なくとも１つの水素がフッ素または塩素で置き換えられた炭素数２から１２のアルケニルオキシであり；ａは、１、２、３、または４である。 Item 5. Item 5. The liquid crystal composition according to any one of items 1 to 4, comprising at least one compound selected from compounds represented by formula (2) as a first component.

In Formula (2), R ^2a is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons; ring A is 1,4-cyclohexylene, 1, 4-phenylene, 2-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, 1,3- Dioxane-2,5-diyl, or tetrahydropyran-2,5-diyl; Z ^2a is a single bond, ethylene, vinylene, carbonyloxy, or difluoromethyleneoxy; X ^2a and X ^2b are hydrogen or is fluorine; Y ^2a is fluorine, chlorine, at least one hydrogen fluorine or a carbon number of 1 which is replaced by chlorine 12 alkyl, reduced the An alkoxy having 1 to 12 carbon atoms in which one hydrogen is replaced by fluorine or chlorine, or an alkenyloxy having 2 to 12 carbon atoms in which at least one hydrogen is replaced by fluorine or chlorine; 3 or 4.

式（２−１）から式（２−３５）において、Ｒ^２ａは、炭素数１から１２のアルキル、炭素数１から１２のアルコキシ、または炭素数２から１２のアルケニルである。 Item 6. Item 6. The liquid crystal composition according to any one of items 1 to 5, comprising at least one compound selected from compounds represented by formulas (2-1) to (2-35) as a first component.

In the formula (2-1) to the formula (2-35), R ^2a is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons.

Item 7. Item 7. The liquid crystal composition according to item 5 or 6, wherein the ratio of the first component is in the range of 10% by mass to 85% by mass.

式（３）において、Ｒ^３ａおよびＲ^３ｂは、炭素数１から１２のアルキル、炭素数１から１２のアルコキシ、炭素数２から１２のアルケニル、または少なくとも１つの水素がフッ素または塩素で置き換えられた炭素数２から１２のアルケニルであり；環Ｂおよび環Ｃは、１，４−シクロヘキシレン、１，４−フェニレン、２−フルオロ−１，４−フェニレン、または２，５−ジフルオロ−１，４−フェニレンであり；Ｚ^３ａは、単結合、エチレン、ビニレン、メチレンオキシ、またはカルボニルオキシであり；ｂは、１、２、または３である。 Item 8. Item 8. The liquid crystal composition according to any one of items 1 to 7, comprising at least one compound selected from compounds represented by formula (3) as the second component.

In Formula (3), R ^3a and R ^3b are alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or at least one hydrogen is replaced by fluorine or chlorine Alkenyl having 2 to 12 carbon atoms; ring B and ring C may be 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, or 2,5-difluoro-1,4. -Phenylene; Z ^3a is a single bond, ethylene, vinylene, methyleneoxy, or carbonyloxy; b is 1, 2, or 3.

式（３−１）から式（３−１３）において、Ｒ^３ａおよびＲ^３ｂは、炭素数１から１２のアルキル、炭素数１から１２のアルコキシ、炭素数２から１２のアルケニル、または少なくとも１つの水素がフッ素または塩素で置き換えられた炭素数２から１２のアルケニルである。 Item 9. Item 9. The liquid crystal composition according to any one of items 1 to 8, comprising at least one compound selected from compounds represented by formulas (3-1) to (3-13) as a second component.

In the formulas (3-1) to (3-13), R ^3a and R ^3b are each an alkyl having 1 to 12 carbons, an alkoxy having 1 to 12 carbons, an alkenyl having 2 to 12 carbons, or at least one Hydrogen is alkenyl having 2 to 12 carbon atoms replaced by fluorine or chlorine.

Item 10. Item 10. The liquid crystal composition according to item 8 or 9, wherein the ratio of the second component is in the range of 10% by mass to 85% by mass.

式（４）において、Ｒ^４ａおよびＲ^４ｂは、水素、炭素数１から１２のアルキル、炭素数１から１２のアルコキシ、炭素数２から１２のアルケニル、または炭素数２から１２のアルケニルオキシであり；環Ｄおよび環Ｆは、１，４−シクロヘキシレン、１，４−シクロヘキセニレン、テトラヒドロピラン−２，５−ジイル、１，４−フェニレン、少なくとも１つの水素がフッ素または塩素で置き換えられた１，４−フェニレン、ナフタレン−２，６−ジイル、少なくとも１つの水素がフッ素または塩素で置き換えられたナフタレン−２，６−ジイル、クロマン−２，６−ジイル、または少なくとも１つの水素がフッ素または塩素で置き換えられたクロマン−２，６−ジイルであり；環Ｅは、２，３−ジフルオロ−１，４−フェニレン、２−クロロ−３−フルオロ−１，４−フェニレン、２，３−ジフルオロ−５−メチル−１，４−フェニレン、３，４，５−トリフルオロナフタレン−２，６−ジイル、７，８−ジフルオロクロマン−２，６−ジイル、３，４，５，６−テトラフルオロフルオレン−２，７−ジイル、４，６−ジフルオロジベンゾフラン−３，７−ジイル、４，６−ジフルオロジベンゾチオフェン−３，７−ジイル、または１，１，６，７−テトラフルオロインダン−２，５−ジイルであり；Ｚ^４ａおよびＺ^４ｂは、単結合、エチレン、ビニレン、メチレンオキシ、またはカルボニルオキシであり；ｃは０、１、２、または３であり、ｄは０または１であり；そしてｃとｄとの和は３以下である。 Item 11. Item 11. The liquid crystal composition according to any one of items 1 to 10, containing at least one compound selected from compounds represented by formula (4) as a third component.

In Formula (4), R ^4a and R ^4b are hydrogen, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or alkenyloxy having 2 to 12 carbons Ring D and Ring F are 1,4-cyclohexylene, 1,4-cyclohexenylene, tetrahydropyran-2,5-diyl, 1,4-phenylene, at least one hydrogen replaced with fluorine or chlorine 1,4-phenylene, naphthalene-2,6-diyl, naphthalene-2,6-diyl, chroman-2,6-diyl, in which at least one hydrogen is replaced by fluorine or chlorine, or at least one hydrogen is fluorine or Chroman-2,6-diyl substituted with chlorine; ring E is 2,3-difluoro-1,4-phenylene, 2- Loro-3-fluoro-1,4-phenylene, 2,3-difluoro-5-methyl-1,4-phenylene, 3,4,5-trifluoronaphthalene-2,6-diyl, 7,8-difluorochroman -2,6-diyl, 3,4,5,6-tetrafluorofluorene-2,7-diyl, 4,6-difluorodibenzofuran-3,7-diyl, 4,6-difluorodibenzothiophene-3,7- Diyl, or 1,1,6,7-tetrafluoroindane-2,5-diyl; Z ^4a and Z ^4b are a single bond, ethylene, vinylene, methyleneoxy, or carbonyloxy; c is 0; 1, 2 or 3; d is 0 or 1; and the sum of c and d is 3 or less.

式（４−１）から式（４−３５）において、Ｒ^４ａおよびＲ^４ｂは、水素、炭素数１から１２のアルキル、炭素数１から１２のアルコキシ、炭素数２から１２のアルケニル、または炭素数２から１２のアルケニルオキシである。 Item 12. Item 12. The liquid crystal composition according to any one of items 1 to 11, comprising at least one compound selected from compounds represented by formulas (4-1) to (4-35) as a third component.

In Formula (4-1) to Formula (4-35), R ^4a and R ^4b are hydrogen, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or carbon It is alkenyloxy of the number 2 to 12.

Item 13. Item 13. The liquid crystal composition according to item 11 or 12, wherein the ratio of the third component is in the range of 3% by mass to 45% by mass.

Item 14. The upper limit temperature of the nematic phase is 70 ° C. or higher, the optical anisotropy at a wavelength of 589 nm (measured at 25 ° C.) is 0.07 or higher, and the dielectric anisotropy at a frequency of 1 kHz (measured at 25 ° C.) is 2. 14. The liquid crystal composition according to any one of items 1 to 13, which is the above.

Item 15. Item 15. A liquid crystal display device comprising the liquid crystal composition according to any one of items 1 to 14.

Item 16. Item 16. The liquid crystal display element according to item 15, wherein the operation mode of the liquid crystal display element is a TN mode, an ECB mode, an OCB mode, an IPS mode, an FFS mode, or an FPA mode, and the driving method of the liquid crystal display element is an active matrix method .

Item 17. Item 15. Use of the liquid crystal composition according to any one of items 1 to 14 in a liquid crystal display device.

  The present invention also includes the following items. (A) selected from additives such as optically active compounds, antioxidants different from the first component, ultraviolet absorbers, quenchers, dyes, antifoaming agents, polymerizable compounds, polymerization initiators, polymerization inhibitors A composition as described above containing one compound, two compounds, or more than two compounds. (B) An AM device containing the above composition. (C) The above-mentioned composition further containing a polymerizable compound, and a polymer-supported orientation (PSA) type AM device containing this composition. (D) A polymer-supported orientation (PSA) type AM device comprising the above-described composition, wherein the polymerizable compound in the composition is polymerized. (E) A device containing the above composition and having a mode of PC, TN, STN, ECB, OCB, IPS, VA, FFS, or FPA. (F) A transmissive device containing the above composition. (G) Use of the above composition as a composition having a nematic phase. (H) Use of an optically active composition obtained by adding an optically active compound to the above composition.

  The composition of the present invention will be described in the following order. First, the constitution of component compounds in the composition will be described. Second, the main characteristics of the component compounds and the main effects of the compounds on the composition will be explained. Third, the combination of components in the composition, the preferred ratio of the components, and the basis thereof will be described. Fourth, a preferred form of the component compound will be described. Fifth, preferred component compounds are shown. Sixth, additives that may be added to the composition will be described. Seventh, a method for synthesizing the component compounds will be described. Finally, the use of the composition will be described.

  First, the composition of the composition will be described. This composition contains a plurality of liquid crystal compounds. The composition may contain additives. Additives include optically active compounds, antioxidants, ultraviolet absorbers, quenchers, dyes, antifoaming agents, polymerizable compounds, polymerization initiators, polymerization inhibitors, polar compounds, and the like. This composition is classified into a composition A and a composition B from the viewpoint of a liquid crystal compound. The composition A may further contain other liquid crystal compounds, additives and the like in addition to the liquid crystal compounds selected from the compound (2), the compound (3), and the compound (4). The “other liquid crystal compound” is a liquid crystal compound different from the compound (2), the compound (3), and the compound (4). Such compounds are mixed into the composition for the purpose of further adjusting the properties.

  Composition B consists essentially of a liquid crystalline compound selected from compound (2), compound (3), and compound (4). “Substantially” means that the composition B may contain an additive but does not contain any other liquid crystal compound. Composition B has fewer components than composition A. From the viewpoint of reducing the cost, the composition B is preferable to the composition A. The composition A is preferable to the composition B from the viewpoint that the characteristics can be further adjusted by mixing other liquid crystal compounds.

  Second, the main characteristics of the component compounds and the main effects of the compounds on the composition and the device will be described. The main characteristics of the component compounds are summarized in Table 2 based on the effects of the present invention. In the symbols in Table 2, L means large or high, M means moderate, and S means small or low. The symbols L, M, and S are classifications based on a qualitative comparison among the component compounds, and the symbol 0 (zero) means smaller than S.

  The main effects of the component compounds are as follows. The first additive acts as an antioxidant and contributes to high stability against heat or light. Since the first additive is added in a small amount, in many cases, it does not affect characteristics such as the maximum temperature, optical anisotropy, and dielectric anisotropy. Compound (2) increases the dielectric anisotropy. Compound (3) decreases the viscosity or increases the maximum temperature. Compound (4) increases the dielectric constant in the minor axis direction.

Organic compounds degrade by light and heat energy and generate radicals. This radical acts as a chain carrier and further reacts with other organic compounds to generate new radicals that are chained. Antioxidants preferentially react with radicals in the system to capture radicals generated with the deterioration of the product (organic compound) and suppress the chain reaction, that is, the progress of deterioration.
Phenolic antioxidants such as 2,6-di-tert-butyl-4-methylphenol are used as general antioxidants, donate hydrogen of the phenol part to radicals, and themselves are sterically hindered. It becomes a phenoxy radical with low activity by such as Furthermore, radicals are captured and stabilized. This action suppresses the increase in radicals.

  The first additive of the present invention includes at least one compound selected from a compound represented by formula (S) and a compound in which at least one hydrogen of the compound represented by formula (S) is replaced with a monovalent group It is. When the OH group of this compound becomes a phenoxy radical, the conjugated system is expanded, and radical scavenging is performed more efficiently. For this reason, compared with the conventional antioxidant, a highly active antioxidant effect | action works.

  Third, the combination of components in the composition, the preferred ratio of the component compounds, and the basis thereof will be described. Preferred combinations of the components in the composition are: first additive + compound (2), first additive + compound (3), first additive + compound (2) + compound (4), first additive + compound (3) + compound (4), first additive + compound (2) + compound (3), first additive + compound (2) + compound (3) + compound (4). Further preferred combinations are: first additive + compound (2) + compound (3) or first additive + compound (2) + compound (3) + compound (4).

  A desirable ratio of the first additive is approximately 0.001% by mass or more for increasing the stability to heat or light, and approximately 2% by mass or less for decreasing the minimum temperature. A more desirable ratio is in the range of approximately 0.01% by mass to approximately 1% by mass. A particularly desirable ratio is in the range of approximately 0.03% by mass to approximately 0.5% by mass.

  A desirable ratio of compound (2) is approximately 10% by mass or more for increasing the dielectric anisotropy, and approximately 85% by mass or less for decreasing the minimum temperature or decreasing the viscosity. A more desirable ratio is in the range of approximately 20% by mass to approximately 80% by mass. A particularly desirable ratio is in the range of approximately 30% by mass to approximately 70% by mass.

  A desirable ratio of compound (3) is approximately 10% by mass or more for increasing the maximum temperature or decreasing the viscosity, and approximately 85% by mass or less for increasing the dielectric anisotropy. A more desirable ratio is in the range of approximately 20% by mass to approximately 80% by mass. A particularly preferred ratio is in the range of approximately 25% by mass to approximately 70% by mass.

  A desirable ratio of compound (4) is approximately 3% by mass or more for increasing the dielectric constant in the minor axis direction, and approximately 45% by mass or less for decreasing the minimum temperature. A more desirable ratio is in the range of approximately 5% by mass to approximately 40% by mass. A particularly desirable ratio is in the range of approximately 5% by mass to approximately 35% by mass.

Fourth, a preferred form of the component compound will be described. In Formula (1), R ^1a , R ^1b , and R ^1c are hydrogen, alkyl having 1 to 20 carbons, an alicyclic hydrocarbon group having 3 to 20 carbons, or aromatic carbonization having 6 to 20 carbons A hydrogen group in which at least one —CH ₂ — may be replaced by —O—, —NH—, —CO—, —COO—, or —OCO—, wherein at least one — CH ₂ —CH ₂ — may be replaced by —CH═CH— or —C≡C—, in which at least one hydrogen is alkyl having 1 to 10 carbons, 1 to 10 carbons. May be replaced by alkoxy or halogen. Preferred R ^1a , R ^1b , or R ^1c is hydrogen, alkyl having 1 to 20 carbons, alicyclic hydrocarbon group having 6 to 15 carbons, aromatic hydrocarbon group having 6 to 15 carbons, at least one -CH ₂ - is, -O -, - CO -, - COO-, or alkyl having 1 carbon is replaced in 20 -OCO-, at least one _-CH 2 -CH ₂ - is -CH = CH- The alkyl having 1 to 20 carbon atoms replaced with or at least one —CH ₂ — is an alicyclic hydrocarbon group having 6 to 15 carbon atoms replaced with —O—. n is 1, 2, 3, or 4. Preferred n is 2, and the substitution position is preferably an ortho position or a para position with respect to the OH group.

In formulas (1-1) to (1-10), R ^1d is hydrogen or alkyl having 1 to 15 carbons, and in this alkyl, at least one —CH ₂ — is —O— or —NH. -, -CO-, -COO-, or -OCO- may be substituted. Preferred R ^1d is hydrogen or alkyl having 1 to 10 carbons. R ^1e and R ^1f are hydrogen, alkyl having 1 to 15 carbons, or alkoxy having 1 to 15 carbons. Preferred R ^1e is alkyl having 1 to 15 carbons. A branched alkyl having a large steric hindrance such as a tert-butyl group is particularly preferred. Preferred R ^1f is alkyl having 1 to 10 carbons. R ^1g is hydrogen or alkyl having 1 to 15 carbons. Preferred R ^1g is alkyl having 1 to 10 carbons. R ^1h is hydrogen or alkyl having 1 to 15 carbons, in which at least one —CH ₂ — is —O—, —NH—, —CO—, —COO—, or —OCO—. It may be replaced. Preferred R ^1h is alkyl having 1 to 10 carbons or alkyl having 1 to 10 carbons in which at least one —CH ₂ — is replaced by —COO— or —OCO—. R ¹ⁱ is alkyl having 1 to 10 carbons, alkoxy having 1 to 10 carbons, or halogen. Preferred R ¹ⁱ is alkyl having 1 to 10 carbons. Z ^1a , Z ^1b , and Z ^1c are a single bond or alkylene having 1 to 5 carbon atoms, and in this alkylene, at least one —CH ₂ — may be replaced by —O—, and these groups In the above, at least one hydrogen may be replaced by alkyl having 1 to 5 carbon atoms. Preferred Z ^1a , Z ^1b or Z ^1c is a single bond. m is 0, 1, 2, 3, 4, or 5. Preferred m is 1, 2 or 3.

Although the typical example of a 1st additive is shown below, this invention is not limited to these.

In Formula (2), Formula (3), and Formula (4), R ^2a is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons. Desirable R ^2a is alkyl having 1 to 12 carbons for increasing the stability to light or heat. R ^3a and R ^3b are alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or 2 to 12 carbons in which at least one hydrogen is replaced by fluorine or chlorine. Alkenyl. Desirable R ^3a or R ^3b is alkenyl having 2 to 12 carbons for decreasing the viscosity, and alkyl having 1 to 12 carbons for increasing the stability to light or heat. R ^4a and R ^4b are hydrogen, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or alkenyloxy having 2 to 12 carbons. Desirable R ^4a or R ^4b is alkyl having 1 to 12 carbons for increasing the stability to light or heat, and alkoxy having 1 to 12 carbons for increasing the dielectric anisotropy.

  Preferred alkyl is methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, or octyl. More desirable alkyl is methyl, ethyl, propyl, butyl or pentyl for decreasing the viscosity.

  Preferred alkoxy is methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, or heptyloxy. More desirable alkoxy is methoxy or ethoxy for decreasing the viscosity.

  Preferred alkenyl is vinyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 1-hexenyl, 2-hexenyl, 3-hexenyl, 4-hexenyl, or 5-hexenyl. More desirable alkenyl is vinyl, 1-propenyl, 3-butenyl or 3-pentenyl for decreasing the viscosity. The preferred configuration of —CH═CH— in these alkenyls depends on the position of the double bond. Trans is preferable in alkenyl such as 1-propenyl, 1-butenyl, 1-pentenyl, 1-hexenyl, 3-pentenyl and 3-hexenyl for decreasing the viscosity. Cis is preferable in alkenyl such as 2-butenyl, 2-pentenyl and 2-hexenyl.

  Preferred alkenyloxy is vinyloxy, allyloxy, 3-butenyloxy, 3-pentenyloxy, or 4-pentenyloxy. More preferable alkenyloxy is allyloxy or 3-butenyloxy for decreasing the viscosity.

  Preferred examples of alkyl in which at least one hydrogen is replaced by fluorine or chlorine are fluoromethyl, 2-fluoroethyl, 3-fluoropropyl, 4-fluorobutyl, 5-fluoropentyl, 6-fluorohexyl, 7-fluoroheptyl. Or 8-fluorooctyl. Further preferred examples are 2-fluoroethyl, 3-fluoropropyl, 4-fluorobutyl or 5-fluoropentyl for increasing the dielectric anisotropy.

  Preferred examples of alkenyl in which at least one hydrogen is replaced by fluorine or chlorine are 2,2-difluorovinyl, 3,3-difluoro-2-propenyl, 4,4-difluoro-3-butenyl, 5,5-difluoro. -4-pentenyl, or 6,6-difluoro-5-hexenyl. Further preferred examples are 2,2-difluorovinyl or 4,4-difluoro-3-butenyl for decreasing the viscosity.

または

であり、好ましくは

である。 Ring A is 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene , Pyrimidine-2,5-diyl, 1,3-dioxane-2,5-diyl, or tetrahydropyran-2,5-diyl. Preferred ring A is 1,4-phenylene or 2-fluoro-1,4-phenylene for increasing the optical anisotropy. Tetrahydropyran-2,5-diyl is

Or

And preferably

It is.

好ましい環Ｅは、粘度を下げるために２，３−ジフルオロ−１，４−フェニレンであり、光学異方性を下げるために２−クロロ−３−フルオロ−１，４−フェニレンであり、誘電率異方性を上げるために７，８−ジフルオロクロマン−２，６−ジイルである。 Ring B and ring C are 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, or 2,5-difluoro-1,4-phenylene. Preferred ring B or ring C is 1,4-cyclohexylene for decreasing the viscosity, or 1,4-phenylene for increasing the optical anisotropy. Ring D and Ring F are 1,4-cyclohexylene, 1,4-cyclohexenylene, tetrahydropyran-2,5-diyl, 1,4-phenylene, 1 in which at least one hydrogen is replaced by fluorine or chlorine , 4-phenylene, naphthalene-2,6-diyl, naphthalene-2,6-diyl, chroman-2,6-diyl, in which at least one hydrogen is replaced by fluorine or chlorine, or at least one hydrogen is fluorine or chlorine Chroman-2,6-diyl replaced by Preferred examples of “1,4-phenylene in which at least one hydrogen is replaced by fluorine or chlorine” are 2-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene or 2-chloro- 3-Fluoro-1,4-phenylene. Preferred ring D or ring F is 1,4-cyclohexylene for decreasing the viscosity, tetrahydropyran-2,5-diyl for increasing the dielectric anisotropy, and for increasing the optical anisotropy. 1,4-phenylene. Ring E is 2,3-difluoro-1,4-phenylene, 2-chloro-3-fluoro-1,4-phenylene, 2,3-difluoro-5-methyl-1,4-phenylene, 3,4, 5-trifluoronaphthalene-2,6-diyl, 7,8-difluorochroman-2,6-diyl, 3,4,5,6-tetrafluorofluorene-2,7-diyl (FLF4), 4,6- Difluorodibenzofuran-3,7-diyl (DBFF2), 4,6-difluorodibenzothiophene-3,7-diyl (DBTF2), or 1,1,6,7-tetrafluoroindane-2,5-diyl (InF4) It is.

Preferred ring E is 2,3-difluoro-1,4-phenylene for decreasing the viscosity and 2-chloro-3-fluoro-1,4-phenylene for decreasing the optical anisotropy. In order to increase anisotropy, it is 7,8-difluorochroman-2,6-diyl.

Z ^2a is a single bond, ethylene, vinylene, carbonyloxy, or difluoromethyleneoxy. Preferred Z ^2a is a single bond for decreasing the viscosity, and difluoromethyleneoxy for increasing the dielectric anisotropy. Z ^3a is a single bond, ethylene, vinylene, methyleneoxy, or carbonyloxy. Desirable Z ^3a is a single bond for decreasing the viscosity. Z ^4a and Z ^4b are a single bond, ethylene, vinylene, methyleneoxy, or carbonyloxy. Desirable Z ^4a or Z ^4b is a single bond for decreasing the viscosity, ethylene for decreasing the minimum temperature, and methyleneoxy for increasing the dielectric anisotropy.

A divalent group such as methyleneoxy is asymmetrical. In methyleneoxy, —CH ₂ O— is preferred to —OCH ₂ —. In carbonyloxy, —COO— is preferred to —OCO—. In difluoromethyleneoxy, —CF ₂ O— is preferred to —OCF ₂ —.

X ^2a and X ^2b are hydrogen or fluorine. Desirable X ^2a or X ^2b is fluorine for increasing the dielectric anisotropy.

Y ^2a is fluorine, chlorine, alkyl having 1 to 12 carbons in which at least one hydrogen is replaced with fluorine or chlorine, alkoxy having 1 to 12 carbons in which at least one hydrogen is replaced with fluorine or chlorine, or at least C2-C12 alkenyloxy in which one hydrogen is replaced by fluorine or chlorine. Desirable Y ^2a is fluorine for decreasing the minimum temperature.

  A preferred example of alkyl in which at least one hydrogen is replaced by fluorine or chlorine is trifluoromethyl. A preferred example of alkoxy in which at least one hydrogen is replaced by fluorine or chlorine is trifluoromethoxy. A preferred example of alkenyloxy in which at least one hydrogen has been replaced by fluorine or chlorine is trifluorovinyloxy.

  a is 1, 2, 3, or 4. Desirable a is 2 for decreasing the minimum temperature, and 3 for increasing the dielectric anisotropy. b is 1, 2 or 3; Preferred b is 1 for decreasing the viscosity, and 2 or 3 for increasing the maximum temperature. c is 0, 1, 2, or 3, d is 0 or 1, and the sum of c and d is 3 or less. Preferred c is 1 for decreasing the viscosity, and 2 or 3 for increasing the maximum temperature. Preferred d is 0 for decreasing the viscosity, and 1 for decreasing the minimum temperature.

  Fifth, preferred component compounds are shown. Desirable compounds (1) are the compounds (1-1) to (1-10) according to Item 3. Among these compounds, the compound (1-2), the compound (1-3), or the compound (1-8) is preferable.

  Desirable compound (2) is the compound (2-1) to the compound (2-35) according to item 6. In these compounds, at least one of the first components is compound (2-4), compound (2-12), compound (2-14), compound (2-15), compound (2-17), compound ( 2-18), compound (2-23), compound (2-24), compound (2-27), compound (2-29), or compound (2-30) is preferred. At least two of the first components are compound (2-12) and compound (2-15), compound (2-14) and compound (2-27), compound (2-18) and compound (2-24), The compound (2-18) and the compound (2-29), the compound (2-24) and the compound (2-29), or a combination of the compound (2-29) and the compound (2-30) is preferable.

  Desirable compound (3) is the compound (3-1) to the compound (3-13) according to item 9. In these compounds, at least one of the second components is the compound (3-1), the compound (3-3), the compound (3-5), the compound (3-6), or the compound (3-7). It is preferable. At least two of the second components are compound (3-1) and compound (3-5), compound (3-1) and compound (3-6), compound (3-1) and compound (3-7), compound A combination of (3-3) and compound (3-5), compound (3-3) and compound (3-6), compound (3-3) and compound (3-7) is preferred.

  Desirable compound (4) is the compound (4-1) to the compound (4-33) according to item 12. In these compounds, at least one of the third components is compound (4-1), compound (4-3), compound (4-6), compound (4-8), compound (4-10), compound ( 4-14) or a compound (4-16) is preferable. At least two of the third components are compound (4-1) and compound (4-8), compound (4-1) and compound (4-14), compound (4-3) and compound (4-8), Compound (4-3) and Compound (4-14), Compound (4-3) and Compound (4-16), Compound (4-6) and Compound (4-8), Compound (4-6) and Compound A combination of (4-10), compound (4-6) and compound (4-16), compound (4-10) and compound (4-16) is preferred.

  Sixth, additives that may be added to the composition will be described. Such additives include optically active compounds, antioxidants different from the first component, ultraviolet absorbers, quenchers, dyes, antifoaming agents, polymerizable compounds, polymerization initiators, polymerization inhibitors, polar compounds, etc. is there. An optically active compound is added to the composition for the purpose of inducing a helical structure of liquid crystal molecules to give a twist angle. Examples of such a compound are the compound (5-1) to the compound (5-5). A desirable ratio of the optically active compound is approximately 5% by mass or less. A more desirable ratio is in the range of approximately 0.01% by mass to approximately 2% by mass.

In order to prevent a decrease in specific resistance due to heating in the atmosphere or to maintain a large voltage holding ratio not only at room temperature but also at a temperature close to the upper limit temperature after using the device for a long time, the compound (6-1 ) To an antioxidant such as compound (6-3) may be further added to the composition.

  Since the compound (6-2) has low volatility, it is effective for maintaining a large voltage holding ratio not only at room temperature but also at a temperature close to the upper limit temperature after the device has been used for a long time. A desirable ratio of the antioxidant is approximately 50 ppm or more for achieving its effect, and is approximately 600 ppm or less for avoiding a decrease in the maximum temperature or avoiding an increase in the minimum temperature. A more desirable ratio is in the range of approximately 100 ppm to approximately 300 ppm.

Preferred examples of the ultraviolet absorber include benzophenone derivatives, benzoate derivatives, triazole derivatives and the like. Also preferred are light stabilizers such as sterically hindered amines. Preferred examples of the light stabilizer include compounds (7-1) to (7-16). A desirable ratio in these absorbents and stabilizers is approximately 50 ppm or more for obtaining the effect thereof, and approximately 10,000 ppm or less for avoiding a decrease in the maximum temperature or avoiding an increase in the minimum temperature. A more desirable ratio is in the range of approximately 100 ppm to approximately 10,000 ppm.

The quencher is a compound that prevents the decomposition of the liquid crystalline compound by receiving the light energy absorbed by the liquid crystalline compound and converting it into thermal energy. Preferred examples of the quencher include the compound (8-1) to the compound (8-7). A desirable ratio of these quenchers is about 50 ppm or more for achieving the effect thereof, and about 20000 ppm or less for decreasing the minimum temperature. A more desirable ratio is in the range of approximately 100 ppm to approximately 10,000 ppm.

  A dichroic dye such as an azo dye or an anthraquinone dye is added to the composition in order to adapt to a GH (guest host) mode device. A preferred ratio of the dye is in the range of approximately 0.01% by mass to approximately 10% by mass. In order to prevent foaming, an antifoaming agent such as dimethyl silicone oil or methylphenyl silicone oil is added to the composition. A desirable ratio of the antifoaming agent is approximately 1 ppm or more for obtaining the effect thereof, and approximately 1000 ppm or less for preventing a display defect. A more desirable ratio is in the range of approximately 1 ppm to approximately 500 ppm.

  A polymerizable compound is added to the composition in order to adapt it to a polymer supported alignment (PSA) type device. Preferable examples of the polymerizable compound include compounds such as acrylate, methacrylate, vinyl compound, vinyloxy compound, propenyl ether, epoxy compound (oxirane, oxetane), vinyl ketone and the like. Further preferred examples are acrylate or methacrylate derivatives. A desirable ratio of the polymerizable compound is approximately 0.05% by mass or more for achieving the effect thereof, and approximately 10% by mass or less for preventing display defects. A more desirable ratio is in the range of approximately 0.1% by mass to approximately 2% by mass. The polymerizable compound is polymerized by irradiation with ultraviolet rays. The polymerization may be performed in the presence of an initiator such as a photopolymerization initiator. Appropriate conditions for polymerization, the appropriate type of initiator, and the appropriate amount are known to those skilled in the art and are described in the literature. For example, Irgacure 651 (registered trademark; BASF), Irgacure 184 (registered trademark; BASF), or Darocur 1173 (registered trademark; BASF), which are photoinitiators, are suitable for radical polymerization. A desirable ratio of the photopolymerization initiator is in the range of approximately 0.1% by mass to approximately 5% by mass based on the mass of the polymerizable compound. A more desirable ratio is in the range of approximately 1% by mass to approximately 3% by mass.

  When storing the polymerizable compound, a polymerization inhibitor may be added in order to prevent polymerization. The polymerizable compound is usually added to the composition without removing the polymerization inhibitor. Examples of the polymerization inhibitor include hydroquinone derivatives such as hydroquinone and methylhydroquinone, 4-tert-butylcatechol, 4-methoxyphenol, phenothiazine and the like.

The polar compound is an organic compound having polarity. Here, a compound having an ionic bond is not included. Atoms such as oxygen, sulfur, and nitrogen are more electronegative and tend to have partial negative charges. Carbon and hydrogen tend to be neutral or have a partial positive charge. Polarity arises from the fact that partial charges are not evenly distributed among different types of atoms in a compound. For example, the polar compound has at least one of partial structures such as —OH, —COOH, —SH, —NH ₂ ,> NH, and> N—.

  Seventh, a method for synthesizing the component compounds will be described. These compounds can be synthesized by known methods. A synthesis method is illustrated. Compound (1-2) is synthesized by the method described in JP2010-120894A. Compound (2-4) is synthesized by the method described in JP-A-10-204016. Compound (3-1) is synthesized by the method described in JP-A-59-176221. Compound (4-1) is synthesized by the method described in Japanese Patent Application Laid-Open No. 2000-053602. Antioxidants are commercially available. Compounds of formula (6) where n is 1 are available from Sigma-Aldrich Corporation. Compound (6) where n is 7, and the like are synthesized by the method described in US Pat. No. 3,660,505.

  Compounds that have not been described as synthetic methods include Organic Syntheses (John Wiley & Sons, Inc), Organic Reactions (John Wiley & Sons, Inc), Comprehensive Organic Synthesis (Comprehensive Organic Synthesis) Synthesis, Pergamon Press) and new experimental chemistry course (Maruzen). The composition is prepared from the compound thus obtained by known methods. For example, the component compounds are mixed and dissolved in each other by heating.

  Finally, the use of the composition will be described. The composition mainly has a minimum temperature of about −10 ° C. or lower, a maximum temperature of about 70 ° C. or higher, and an optical anisotropy in the range of about 0.07 to about 0.20. A composition having an optical anisotropy in the range of about 0.08 to about 0.25 may be prepared by controlling the ratio of the component compounds or by mixing other liquid crystal compounds. By trial and error, compositions having optical anisotropy in the range of about 0.10 to about 0.30 may be prepared. A device containing this composition has a large voltage holding ratio. This composition is suitable for an AM device. This composition is particularly suitable for a transmissive AM device. This composition can be used as a composition having a nematic phase, or can be used as an optically active composition by adding an optically active compound.

  This composition can be used for an AM device. Further, it can be used for PM elements. This composition can be used for an AM device and a PM device having modes such as PC, TN, STN, ECB, OCB, IPS, FFS, VA, and FPA. Use for an AM device having a TN, OCB, IPS mode or FFS mode is particularly preferable. In an AM device having an IPS mode or an FFS mode, when no voltage is applied, the alignment of liquid crystal molecules may be parallel to or perpendicular to the glass substrate. These elements may be reflective, transmissive, or transflective. Use in a transmissive element is preferred. It can also be used for an amorphous silicon-TFT device or a polycrystalline silicon-TFT device. It can also be used for an NCAP (nematic curvilinear aligned phase) type device produced by microencapsulating this composition, or a PD (polymer dispersed) type device in which a three-dimensional network polymer is formed in the composition.

  The invention is explained in more detail by means of examples. The invention is not limited by these examples. The present invention includes a mixture of the composition of Example 1 and the composition of Example 2. The invention also includes a mixture of at least two of the example compositions. The synthesized compound was identified by a method such as NMR analysis. The characteristics of the compound, composition, and device were measured by the methods described below.

NMR analysis: For measurement, DRX-500 manufactured by Bruker BioSpin Corporation was used. ^In the measurement of ¹ H-NMR, the sample was dissolved in a deuterated solvent such as CDCl _3, and the measurement was performed at room temperature under conditions of 500 MHz and 16 integrations. Tetramethylsilane was used as an internal standard. ^{For 19} F-NMR measurement, CFCl ₃ was used as an internal standard, and the number of integrations was 24. In the description of the nuclear magnetic resonance spectrum, s is a singlet, d is a doublet, t is a triplet, q is a quartet, quint is a quintet, sex is a sextet, m is a multiplet, and br is broad.

  Gas chromatographic analysis: A GC-14B gas chromatograph manufactured by Shimadzu Corporation was used for measurement. The carrier gas is helium (2 mL / min). The sample vaporization chamber was set at 280 ° C, and the detector (FID) was set at 300 ° C. For separation of the component compounds, capillary column DB-1 (length 30 m, inner diameter 0.32 mm, film thickness 0.25 μm; stationary liquid phase is dimethylpolysiloxane; nonpolar) manufactured by Agilent Technologies Inc. was used. The column was held at 200 ° C. for 2 minutes and then heated to 280 ° C. at a rate of 5 ° C./min. A sample was prepared in an acetone solution (0.1% by mass), and 1 μL thereof was injected into the sample vaporization chamber. The recorder is a C-R5A type Chromatopac manufactured by Shimadzu Corporation or an equivalent thereof. The obtained gas chromatogram showed the peak retention time and peak area corresponding to the component compounds.

  As a solvent for diluting the sample, chloroform, hexane or the like may be used. In order to separate the component compounds, the following capillary column may be used. HP-1 (length 30 m, inner diameter 0.32 mm, film thickness 0.25 μm) manufactured by Agilent Technologies Inc., Rtx-1 (length 30 m, inner diameter 0.32 mm, film thickness 0.25 μm) manufactured by Restek Corporation, BP-1 made by SGE International Pty. Ltd (length 30 m, inner diameter 0.32 mm, film thickness 0.25 μm). In order to prevent compound peaks from overlapping, a capillary column CBP1-M50-025 (length 50 m, inner diameter 0.25 mm, film thickness 0.25 μm) manufactured by Shimadzu Corporation may be used.

  The ratio of the liquid crystal compound contained in the composition may be calculated by the following method. The mixture of liquid crystalline compounds is analyzed by gas chromatography (FID). The area ratio of peaks in the gas chromatogram corresponds to the ratio of liquid crystal compounds. When the capillary column described above is used, the correction coefficient of each liquid crystal compound may be regarded as 1. Therefore, the ratio (% by mass) of the liquid crystal compound can be calculated from the peak area ratio.

  Measurement sample: When measuring the characteristics of the composition or the device, the composition was used as it was as a sample. When measuring the characteristics of the compound, a sample for measurement was prepared by mixing this compound (15% by mass) with the mother liquid crystal (85% by mass). The characteristic value of the compound was calculated from the value obtained by the measurement by extrapolation. (Extrapolated value) = {(Measured value of sample) −0.85 × (Measured value of mother liquid crystal)} / 0.15. When the smectic phase (or crystal) precipitates at 25 ° C. at this ratio, the ratio of the compound and the mother liquid crystal is 10% by mass: 90% by mass, 5% by mass: 95% by mass, and 1% by mass: 99% by mass in this order. changed. By this extrapolation method, the maximum temperature, optical anisotropy, viscosity, and dielectric anisotropy values for the compound were determined.

The following mother liquid crystals were used. The ratio of the component compound is indicated by mass%.

  Measuring method: The characteristics were measured by the following method. Many of these are the methods described in the JEITA standard (JEITA ED-2521B) established by the Japan Electronics and Information Technology Industries Association (JEITA), or a modified method thereof. Met. No thin film transistor (TFT) was attached to the TN device used for the measurement.

(1) Maximum temperature of nematic phase (NI; ° C.): A sample was placed on a hot plate of a melting point measuring apparatus equipped with a polarizing microscope and heated at a rate of 1 ° C./min. The temperature was measured when a part of the sample changed from a nematic phase to an isotropic liquid. The upper limit temperature of the nematic phase may be abbreviated as “upper limit temperature”.

(2) Minimum Temperature of a Nematic Phase _{(T C;} ° C.): A sample having a nematic phase was put in a glass bottle, 0 ℃, -10 ℃, -20 ℃, -30 ℃, and -40 ℃ for 10 days in a freezer After storage, the liquid crystal phase was observed. For example, when the sample remained in the nematic phase at −20 ° C. and changed to a crystalline or smectic phase at −30 ° C., the _TC was described as <−20 ° C. The lower limit temperature of the nematic phase may be abbreviated as “lower limit temperature”.

(3) Viscosity (bulk viscosity; η; measured at 20 ° C .; mPa · s): An E-type viscometer manufactured by Tokyo Keiki Co., Ltd. was used for the measurement.

(4) Viscosity (rotational viscosity; γ1; measured at 25 ° C .; mPa · s): The measurement was performed according to the method described in M. Imai et al., Molecular Crystals and Liquid Crystals, Vol. 259, 37 (1995). I followed. A sample was put in a TN device having a twist angle of 0 ° and a distance (cell gap) between two glass substrates of 5 μm. A voltage was applied to this device in steps of 0.5 V in the range of 16 V to 19.5 V. After no application for 0.2 seconds, the application was repeated under the condition of only one rectangular wave (rectangular pulse; 0.2 seconds) and no application (2 seconds). The peak current and peak time of the transient current generated by this application were measured. The value of rotational viscosity was obtained from these measured values and the calculation formula (10) described on page 40 in the paper by M. Imai et al. The value of dielectric anisotropy necessary for this calculation was determined by the method described below using the element whose rotational viscosity was measured.

(5) Optical anisotropy (refractive index anisotropy; Δn; measured at 25 ° C.): Measurement was performed with an Abbe refractometer using a light having a wavelength of 589 nm and a polarizing plate attached to an eyepiece. After rubbing the surface of the main prism in one direction, the sample was dropped on the main prism. The refractive index n‖ was measured when the polarization direction was parallel to the rubbing direction. The refractive index n⊥ was measured when the polarization direction was perpendicular to the rubbing direction. The value of optical anisotropy was calculated from the equation: Δn = n∥−n⊥.

(6) Dielectric anisotropy (Δε; measured at 25 ° C.): A sample was put in a TN device in which the distance between two glass substrates (cell gap) was 9 μm and the twist angle was 80 degrees. Sine waves (10 V, 1 kHz) were applied to the device, and after 2 seconds, the dielectric constant (ε‖) in the major axis direction of the liquid crystal molecules was measured. Sine waves (0.5 V, 1 kHz) were applied to the device, and after 2 seconds, the dielectric constant (ε⊥) in the minor axis direction of the liquid crystal molecules was measured. The value of dielectric anisotropy was calculated from the equation: Δε = ε∥−ε⊥.

(7) Threshold voltage (Vth; measured at 25 ° C .; V): An LCD5100 luminance meter manufactured by Otsuka Electronics Co., Ltd. was used for the measurement. The light source was a halogen lamp. A sample was put in a normally white mode TN device in which the distance between two glass substrates (cell gap) was 0.45 / Δn (μm) and the twist angle was 80 degrees. The voltage (32 Hz, rectangular wave) applied to this element was increased stepwise from 0V to 10V by 0.02V. At this time, the device was irradiated with light from the vertical direction, and the amount of light transmitted through the device was measured. A voltage-transmittance curve was created in which the transmittance was 100% when the light amount reached the maximum and the transmittance was 0% when the light amount was the minimum. The threshold voltage was expressed as a voltage when the transmittance reached 90%.

(8) Voltage holding ratio (VHR-9; measured at 25 ° C .;%): The TN device used for the measurement had a polyimide alignment film, and the distance between two glass substrates (cell gap) was 5 μm. . This element was sealed with an adhesive that was cured with ultraviolet rays after the sample was placed. The TN device was charged by applying a pulse voltage (60 microseconds at 1 V). The decaying voltage was measured with a high-speed voltmeter for 166.7 milliseconds, and the area A between the voltage curve and the horizontal axis in a unit cycle was determined. Area B was the area when it was not attenuated. The voltage holding ratio was expressed as a percentage of area A with respect to area B.

(9) Voltage holding ratio (VHR-10; measured at 60 ° C .;%): The voltage holding ratio was measured in the same procedure as above except that it was measured at 60 ° C. instead of 25 ° C. The obtained value was represented by VHR-10.

(10) Voltage holding ratio (VHR-11; measured at 60 ° C .;%): After irradiation with ultraviolet rays, the voltage holding ratio was measured to evaluate the stability against ultraviolet rays. The TN device used for the measurement had a polyimide alignment film, and the cell gap was 5 μm. A sample was injected into this device and irradiated with ultraviolet light of 5 mW / cm ² for 167 minutes. The light source was Black Light manufactured by Eye Graphics Co., Ltd., F40T10 / BL (peak wavelength 369 nm), and the distance between the element and the light source was 5 mm. In the measurement of VHR-11, a decreasing voltage was measured for 166.7 milliseconds. A composition having a large VHR-11 has a large stability to ultraviolet light.

(11) Voltage holding ratio (VHR-12; measured at 60 ° C .;%): The TN device into which the sample was injected was heated in a constant temperature bath at 120 ° C. for 20 hours, and then the voltage holding ratio was measured and stability against heat. Evaluated. In the measurement of VHR-12, a voltage decaying for 166.7 milliseconds was measured. A composition having a large VHR-12 has a large stability to heat.

(12) Voltage holding ratio (VHR-13; measured at 60 ° C .;%): After irradiating the LED light, the voltage holding ratio was measured to evaluate the stability against the LED light. The LED light used was light (visible light) emitted from a general 32-inch TV backlight unit using LEDs as light emitting elements. The measured luminance value in the irradiated surface was 3500-3970 cd / m2. In the test, TN elements injected with the sample were arranged on the backlight unit and irradiated for 4 weeks, and then the voltage holding ratio was measured to evaluate the stability against LED light. In the measurement of VHR-13, a decaying voltage was measured for 166.7 milliseconds. A composition having a large VHR-13 has a large stability to LED light.

(13) Response time (τ; measured at 25 ° C .; ms): An LCD5100 luminance meter manufactured by Otsuka Electronics Co., Ltd. was used for measurement. The light source was a halogen lamp. The low-pass filter was set to 5 kHz. A sample was put in a normally white mode TN device in which the distance between two glass substrates (cell gap) was 5.0 μm and the twist angle was 80 degrees. A rectangular wave (60 Hz, 5 V, 0.5 seconds) was applied to this element. At this time, the device was irradiated with light from the vertical direction, and the amount of light transmitted through the device was measured. It was considered that the transmittance was 100% when the light amount was the maximum, and the transmittance was 0% when the light amount was the minimum. The rise time (τr: rise time; millisecond) is the time required for the transmittance to change from 90% to 10%. The fall time (τf: fall time; millisecond) is the time required to change the transmittance from 10% to 90%. The response time was expressed as the sum of the rise time and the fall time thus obtained.

(14) Elastic constant (K; measured at 25 ° C .; pN): An HP4284A LCR meter manufactured by Yokogawa-Hewlett-Packard Co., Ltd. was used for the measurement. A sample was put in a horizontal alignment element in which the distance between two glass substrates (cell gap) was 20 μm. A charge of 0 to 20 volts was applied to the device, and the capacitance and applied voltage were measured. Fitting the measured values of capacitance (C) and applied voltage (V) using “Liquid Crystal Device Handbook” (Nikkan Kogyo Shimbun), formulas (2.98) and (2.101) on page 75 Thus, the values of K11 and K33 were obtained from the formula (2.99). Next, K22 was calculated from the equation (3.18) on page 171 using the values of K11 and K33 obtained earlier. The elastic constant was expressed as an average value of K11, K22, and K33 thus determined.

(15) Specific resistance (ρ; measured at 25 ° C .; Ωcm): A sample (1.0 mL) was poured into a container equipped with electrodes. A DC voltage (10 V) was applied to the container, and the DC current after 10 seconds was measured. The specific resistance was calculated from the following equation. (Resistivity) = {(Voltage) × (Capacity of container)} / {(DC current) × (Dielectric constant of vacuum)}.

(16) Helical pitch (P; measured at room temperature; μm): The helical pitch was measured by the wedge method. See "Liquid Crystal Handbook", page 196 (2000 published, Maruzen). The sample was poured into a wedge-shaped cell and allowed to stand at room temperature for 2 hours, and then the disclination line interval (d2-d1) was observed with a polarizing microscope (Nikon Corporation, trade name: MM40 / 60 series). The helical pitch (P) was calculated from the following equation in which the angle of the wedge cell was expressed as θ. P = 2 * (d2-d1) * tan [theta].

(17) Dielectric constant in the minor axis direction (ε⊥; measured at 25 ° C.): A sample was put in a TN device in which the distance between two glass substrates (cell gap) was 9 μm and the twist angle was 80 degrees. . Sine waves (0.5 V, 1 kHz) were applied to the device, and after 2 seconds, the dielectric constant (ε⊥) in the minor axis direction of the liquid crystal molecules was measured.

The compounds in Examples were represented by symbols based on the definitions in Table 3 below. In Table 3, the configuration regarding 1,4-cyclohexylene is trans. The number in parentheses after the symbol corresponds to the compound number. The symbol (−) means other liquid crystal compounds. The ratio (percentage) of the liquid crystal compound is a mass percentage (% by mass) based on the mass of the liquid crystal composition. Finally, the characteristic values of the composition are summarized.

[Comparative Example 1]
3-HHXB (F, F) -CF3 (2-5) 12%
3-GB (F, F) XB (F, F) -F (2-14) 8%
3-GBB (F) B (F, F) -F (2-22) 3%
4-GBB (F) B (F, F) -F (2-22) 2%
3-HBBBXB (F, F) -F (2-23) 3%
4-GB (F) B (F, F) XB (F, F) -F (2-27) 5%
5-GB (F) B (F, F) XB (F, F) -F (2-27) 5%
5-BB (F) B (F, F) XB (F, F) -F (2-29) 12%
3-HH-V (3-1) 23%
3-HH-V1 (3-1) 10%
1V2-HH-3 (3-1) 9%
V2-HHB-1 (3-5) 8%
NI = 89.0 ° C .; Tc <−20 ° C .; Δn = 0.101; Δε = 13.4; Vth = 1.34V; γ1 = 13.7 mPa · s; VHR-13 = 85.0%

A composition obtained by adding the compound (1-D) to the composition of Comparative Example 1 was taken as Example 1.
[Example 1]
3-HHXB (F, F) -CF3 (2-5) 12%
3-GB (F, F) XB (F, F) -F (2-14) 8%
3-GBB (F) B (F, F) -F (2-22) 3%
4-GBB (F) B (F, F) -F (2-22) 2%
3-HBBBXB (F, F) -F (2-23) 3%
4-GB (F) B (F, F) XB (F, F) -F (2-27) 5%
5-GB (F) B (F, F) XB (F, F) -F (2-27) 5%
5-BB (F) B (F, F) XB (F, F) -F (2-29) 12%
3-HH-V (3-1) 23%
3-HH-V1 (3-1) 10%
1V2-HH-3 (3-1) 9%
V2-HHB-1 (3-5) 8%
Compound (1-D) was added to this composition in a proportion of 0.100% by mass.
NI = 89.0 ° C .; Tc <−20 ° C .; Δn = 0.101; Δε = 13.4; Vth = 1.34V; γ1 = 13.7 mPa · s; VHR-13 = 94.5%

[Example 2]
3-HHXB (F, F) -F (2-4) 6%
3-BB (F, F) XB (F, F) -F (2-18) 13%
3-HHBB (F, F) -F (2-19) 4%
4-HHBB (F, F) -F (2-19) 5%
3-HBBBXB (F, F) -F
(2-23) 3%
3-BB (F) B (F, F) XB (F) -F (2-28) 2%
4-BB (F) B (F, F) XB (F, F) -F (2-29) 8%
5-BB (F) B (F, F) XB (F, F) -F (2-29) 7%
3-HH-V (3-1) 44%
V-HHB-1 (3-5) 6%
2-BB (F) B-3 (3-8) 2%
Compound (1-A) was added to this composition at a ratio of 0.100% by mass.
NI = 80.2 ° C .; Tc <−30 ° C .; Δn = 0.106; Δε = 8.1; Vth = 1.45 V; η = 11.6 mPa · s; γ1 = 60.0 mPa · s; VHR-13 = 99.0%

[Example 3]
5-HXB (F, F) -F (2-1) 3%
3-HHXB (F, F) -F (2-4) 3%
3-HHXB (F, F) -CF3 (2-5) 3%
3-HGB (F, F) -F (2-6) 3%
5-HB (F) B (F, F) -F (2-9) 1%
3-BB (F, F) XB (F, F) -F (2-18) 6%
3-HHBB (F, F) -F (2-19) 6%
5-BB (F) B (F, F) XB (F) B (F, F) -F (2-31) 1%
3-BB (2F, 3F) XB (F, F) -F (2-32) 4%
V2-B (2F, 3F) BXB (F, F) -F (2-33) 1%
3-HHB (F, F) XB (F, F) -F (2) 1%
3-HB-CL (2) 3%
3-HHB-OCF3 (2) 3%
3-HH-V (3-1) 28%
3-HH-V1 (3-1) 14%
5-HB-O2 (3-2) 5%
3-HHEH-3 (3-4) 3%
3-HBB-2 (3-6) 9%
5-B (F) BB-3 (3-7) 3%
Compound (1-D) was added to the composition at a ratio of 0.070% by mass.
NI = 74.2 ° C .; Tc <−20 ° C .; Δn = 0.091; Δε = 3.7; Vth = 2.87 V; η = 5.8 mPa · s; γ1 = 40.9 mPa · s; VHR-13 = 90.0%

[Example 4]
5-HXB (F, F) -F (2-1) 6%
3-HHXB (F, F) -F (2-4) 6%
5-HB (F) B (F, F) -F (2-9) 5%
3-HHB (F) B (F, F) -F (2-20) 7%
2-BB (F) B (F, F) XB (F) -F (2-28) 3%
3-BB (F) B (F, F) XB (F) -F (2-28) 3%
4-BB (F) B (F, F) XB (F) -F (2-28) 4%
5-HB-CL (2) 5%
2-HH-5 (3-1) 8%
3-HH-V (3-1) 10%
3-HH-V1 (3-1) 7%
4-HH-V (3-1) 10%
4-HH-V1 (3-1) 8%
5-HB-O2 (3-2) 7%
4-HHEH-3 (3-4) 3%
1-BB (F) B-2V (3-8) 3%
1O1-HBBH-3 (-) 5%
The compound (1-D) was added to the composition at a ratio of 0.080% by mass.
NI = 80.3 ° C .; Tc <−20 ° C .; Δn = 0.091; Δε = 4.2; Vth = 1.50 V; η = 8.4 mPa · s; γ1 = 54.2 mPa · s; VHR-13 = 98.7%

[Example 5]
3-HHEB (F, F) -F (2-3) 5%
3-HHXB (F, F) -F (2-4) 7%
5-HBEB (F, F) -F (2-10) 5%
3-BB (F, F) XB (F, F) -F (2-18) 10%
2-HHB (F) B (F, F) -F (2-20) 3%
3-HB (2F, 3F) BXB (F, F) -F (2-34) 3%
3-BB (2F, 3F) BXB (F, F) -F (2-35) 2%
5-HHB (F, F) XB (F, F) -F (2) 6%
2-HH-3 (3-1) 8%
2-HH-5 (3-1) 20%
3-HH-V (3-1) 6%
4-HH-V (3-1) 6%
V-HH-V (3-1) 1%
5-HB-O2 (3-2) 5%
V2-B2BB-1 (3-9) 3%
3-HHEBH-3 (3-11) 5%
3-HHEBH-5 (3-11) 5%
Compound (1-D) was added to this composition in a proportion of 0.075% by mass.
NI = 90.8 ° C .; Tc <−20 ° C .; Δn = 0.084; Δε = 5.4; Vth = 1.65 V; η = 13.6 mPa · s; γ1 = 60.1 mPa · s; VHR-13 = 93.5%

[Example 6]
3-BBXB (F, F) -F (2-17) 1%
3-BB (F, F) XB (F, F) -F (2-18) 11%
3-HHBB (F, F) -F (2-19) 5%
4-HHBB (F, F) -F (2-19) 3%
5-HHBB (F, F) -F (2-19) 1%
3-HBBBXB (F, F) -F (2-23) 2%
3-HBB (F, F) XB (F, F) -F (2-24) 1%
3-BB (F) B (F, F) XB (F) -F (2-28) 3%
3-BB (F) B (F, F) XB (F, F) -F (2-29) 3%
4-BB (F) B (F, F) XB (F, F) -F (2-29) 5%
5-BB (F) B (F, F) XB (F, F) -F (2-29) 4%
2-HH-3 (3-1) 6%
3-HH-5 (3-1) 6%
3-HH-V (3-1) 24%
3-HH-VFF (3-1) 6%
V-HH-V1 (3-1) 1%
3-HB-O2 (3-2) 2%
5-HB-O2 (3-2) 5%
V-HHB-1 (3-5) 6%
V-HBB-2 (3-6) 5%
Compound (1-A) was added to this composition in a proportion of 0.090% by mass.
NI = 79.6 ° C .; Tc <−20 ° C .; Δn = 0.105; Δε = 6.8; Vth = 1.55 V; η = 11.6 mPa · s; γ1 = 55.6 mPa · s; VHR-13 = 94.2%

[Example 7]
3-HGB (F, F) -F (2-6) 3%
5-GHB (F, F) -F (2-7) 4%
3-GB (F, F) XB (F, F) -F (2-14) 5%
3-BB (F) B (F, F) -CF3 (2-16) 2%
3-HHBB (F, F) -F (2-19) 4%
3-GBB (F) B (F, F) -F (2-22) 2%
2-dhBB (F, F) XB (F, F) -F (2-25) 4%
3-GB (F) B (F, F) XB (F, F) -F (2-27) 3%
3-HGB (F, F) XB (F, F) -F (2) 5%
7-HB (F, F) -F (2) 3%
2-HH-3 (3-1) 14%
2-HH-5 (3-1) 4%
3-HH-V (3-1) 26%
1V2-HH-3 (3-1) 5%
1-BB-3 (3-3) 3%
2-BB (F) B-3 (3-8) 3%
3-HB (F) HH-2 (3-10) 4%
5-HBB (F) B-2 (3-13) 6%
The compound (1-D) was added to the composition at a ratio of 0.080% by mass.
NI = 79.3 ° C .; Tc <−20 ° C .; Δn = 0.099; Δε = 5.2; Vth = 1.45 V; η = 11.5 mPa · s; γ1 = 61.7 mPa · s; VHR-13 = 98.4%

[Example 8]
3-HBB (F, F) -F (2-8) 5%
5-HBB (F, F) -F (2-8) 4%
3-BB (F) B (F, F) -F (2-15) 3%
3-BB (F) B (F, F) XB (F, F) -F (2-29) 3%
4-BB (F) B (F, F) XB (F, F) -F (2-29) 5%
3-BB (F, F) XB (F) B (F, F) -F (2-30) 3%
5-BB (F) B (F, F) XB (F) B (F, F) -F (2-31) 1%
3-HH2BB (F, F) -F (2) 3%
4-HH2BB (F, F) -F (2) 3%
2-HH-5 (3-1) 9%
3-HH-V (3-1) 28%
3-HH-V1 (3-1) 10%
4-HH-V1 (3-1) 9%
5-HB-O2 (3-2) 5%
7-HB-1 (3-2) 5%
VFF-HHB-O1 (3-5) 1%
VFF-HHB-1 (3-5) 3%
Compound (1-D) was added to this composition in a proportion of 0.075% by mass.
NI = 71.5 ° C .; Tc <−20 ° C .; Δn = 0.0894; Δε = 3.0; Vth = 2.62 V; η = 10.0 mPa · s; γ1 = 45.0 mPa · s; VHR-13 = 90.0%

[Example 9]
3-HHB (F, F) -F (2-2) 8%
3-GB (F) B (F) -F (2-11) 1%
3-GB (F) B (F, F) -F (2-12) 2%
3-BB (F, F) XB (F, F) -F (2-18) 9%
3-GB (F) B (F, F) XB (F, F) -F (2-27) 6%
5-GB (F) B (F, F) XB (F, F) -F (2-27) 6%
3-HH-V (3-1) 30%
3-HH-V1 (3-1) 10%
1V2-HH-3 (3-1) 8%
3-HH-VFF (3-1) 8%
1-BB-3 (3-3) 2%
5-HB (F) BH-3 (3-12) 10%
Compound (1-D) was added to the composition at a ratio of 0.070% by mass.
NI = 79.5 ° C .; Tc <−20 ° C .; Δn = 0.087; Δε = 6.5; Vth = 1.85 V; η = 13.9 mPa · s; γ1 = 66.9 mPa · s; VHR-13 = 98.3%

[Example 10]
3-HHEB (F, F) -F (2-3) 4%
5-HHEB (F, F) -F (2-3) 3%
3-HBEB (F, F) -F (2-10) 3%
5-HBEB (F, F) -F (2-10) 3%
3-GB (F, F) XB (F) -F (2-13) 1%
3-BB (F) B (F, F) -F (2-15) 2%
3-GB (F) B (F, F) XB (F, F) -F (2-27) 5%
4-GB (F) B (F, F) XB (F, F) -F (2-27) 5%
5-HB-CL (2) 5%
3-HHB-OCF3 (2) 4%
3-HHB (F, F) XB (F, F) -F (2) 5%
5-HHB (F, F) XB (F, F) -F (2) 3%
3-HGB (F, F) XB (F, F) -F (2) 5%
2-HH-5 (3-1) 3%
3-HH-5 (3-1) 5%
3-HH-V (3-1) 24%
4-HH-V (3-1) 5%
1V2-HH-3 (3-1) 5%
3-HHEH-3 (3-4) 5%
5-B (F) BB-2 (3-7) 3%
5-B (F) BB-3 (3-7) 2%
Compound (1-A) was added to this composition in a proportion of 0.060% by mass.
NI = 82.9 ° C .; Tc <−20 ° C .; Δn = 0.093; Δε = 6.9; Vth = 1.50 V; η = 16.3 mPa · s; γ1 = 65.2 mPa · s; VHR-13 = 98.1%

[Example 11]
3-HHEB (F, F) -F (2-3) 4%
3-HBEB (F, F) -F (2-10) 3%
5-HBEB (F, F) -F (2-10) 3%
3-BB (F) B (F, F) -F (2-15) 3%
3-HBBBXB (F, F) -F (2-23) 6%
4-GBB (F, F) XB (F, F) -F (2-26) 2%
5-GBB (F, F) XB (F, F) -F (2-26) 2%
3-GB (F) B (F, F) XB (F, F) -F (2-27) 5%
4-GB (F) B (F, F) XB (F, F) -F (2-27) 5%
5-HHB (F, F) XB (F, F) -F (2) 3%
3-HGB (F, F) XB (F, F) -F (2) 3%
5-HB-CL (2) 2%
3-HHB-OCF3 (2) 4%
3-HH-5 (3-1) 4%
3-HH-V (3-1) 21%
3-HH-V1 (3-1) 3%
4-HH-V (3-1) 4%
1V2-HH-3 (3-1) 6%
5-B (F) BB-2 (3-7) 3%
5-B (F) BB-3 (3-7) 2%
3-HB (2F, 3F) -O2 (4-1) 3%
3-BB (2F, 3F) -O2 (4-6) 2%
3-HHB (2F, 3F) -O2 (4-8) 4%
F3-HH-V (-) 3%
The compound (1-D) was added to the composition at a ratio of 0.080% by mass.
NI = 78.2 ° C .; Tc <−20 ° C .; Δn = 0.101; Δε = 6.7; Vth = 1.45 V; η = 17.8 mPa · s; γ1 = 67.8 mPa · s; VHR-13 = 96.7%

[Example 12]
3-HHXB (F, F) -F (2-4) 9%
3-BB (F) B (F, F) -F (2-15) 14%
3-HH-V (3-1) 39%
3-HH-V1 (3-1) 10%
1V2-HH-3 (3-1) 6%
V-HHB-1 (3-5) 3%
V2-HHB-1 (3-5) 3%
2-HBB (2F, 3F) -O2 (4-14) 3%
3-HBB (2F, 3F) -O2 (4-14) 7%
4-HBB (2F, 3F) -O2 (4-14) 3%
3-dhBB (2F, 3F) -O2 (4-16) 2%
2-BB (2F, 3F) B-3 (4-19) 1%
Compound (1-D) was added to the composition at a ratio of 0.070% by mass.
NI = 82.2 ° C .; Tc <−20 ° C .; Δn = 0.099; Δε = 2.0; Vth = 2.94 V; η = 9.9 mPa · s; γ1 = 37.0 mPa · s; VHR-13 = 98.7%

  The voltage holding ratio (VHR-13) after ultraviolet irradiation of the composition of Comparative Example 1 was 85.0%. On the other hand, VHR-13 of the composition of Example 1 was 94.5%. Thus, the composition of Example 1 had a larger VHR-13 than the composition of Comparative Example 1. Therefore, it is concluded that the liquid crystal composition of the present invention has excellent characteristics.

  The liquid crystal composition of the present invention can be used for a liquid crystal monitor, a liquid crystal television and the like.

Claims (17)

The first additive was selected from a compound represented by the formula (S) and a compound in which at least one hydrogen was replaced with a monovalent group, excluding the hydrogen of the hydroxyl group of the compound represented by the formula (S). A liquid crystal composition comprising at least one compound and having a nematic phase and positive dielectric anisotropy.

The liquid crystal composition according to claim 1, comprising at least one compound selected from the compounds represented by formula (1) as the first additive.

In Formula (1), R ^1a , R ^1b , and R ^1c are hydrogen, alkyl having 1 to 20 carbons, an alicyclic hydrocarbon group having 3 to 20 carbons, or aromatic carbonization having 6 to 20 carbons A hydrogen group in which at least one —CH ₂ — may be replaced by —O—, —NH—, —CO—, —COO—, or —OCO—, wherein at least one — CH ₂ —CH ₂ — may be replaced by —CH═CH— or —C≡C—, in which at least one hydrogen is alkyl having 1 to 10 carbons, 1 to 10 carbons. May be replaced by alkoxy, or halogen; n is 1, 2, 3, or 4. The liquid crystal composition according to claim 1 or 2, comprising at least one compound selected from compounds represented by formulas (1-1) to (1-10) as a first additive.

In formulas (1-1) to (1-10), R ^1d is hydrogen or alkyl having 1 to 15 carbons, and in this alkyl, at least one —CH ₂ — is —O— or —NH. -, -CO-, -COO-, or -OCO- may be replaced; R ^1e and R ^1f are hydrogen, alkyl having 1 to 15 carbons, or alkoxy having 1 to 15 carbons; R ^{1 g} is hydrogen or alkyl having 1 to 15 carbons; R ^1h is hydrogen or alkyl having 1 to 15 carbons, in which at least one —CH ₂ — is —O—, —NH -, - CO -, - COO- , or may be replaced by ^{-OCO-; R 1i} is alkyl of 1 to 10 carbons, there 1 -C 10 alkoxy or halogen,; ^{Z 1} , ^{Z 1b} and ^{Z 1c,} is alkylene of 5 a single bond or 1 carbon atoms, in the alkylene, at least one -CH ₂ - may be replaced by -O-, in these groups, At least one hydrogen may be replaced by alkyl having 1 to 5 carbons; m is 0, 1, 2, 3, 4, or 5.   The liquid crystal composition according to any one of claims 1 to 3, wherein a ratio of the first additive is in a range of 0.001% by mass to 2% by mass. The liquid crystal composition according to any one of claims 1 to 4, comprising at least one compound selected from compounds represented by formula (2) as a first component.

In Formula (2), R ^2a is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons; ring A is 1,4-cyclohexylene, 1, 4-phenylene, 2-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, 1,3- Dioxane-2,5-diyl, or tetrahydropyran-2,5-diyl; Z ^2a is a single bond, ethylene, vinylene, carbonyloxy, or difluoromethyleneoxy; X ^2a and X ^2b are hydrogen or is fluorine; Y ^2a is fluorine, chlorine, at least one hydrogen fluorine or a carbon number of 1 which is replaced by chlorine 12 alkyl, reduced the An alkoxy having 1 to 12 carbon atoms in which one hydrogen is replaced with fluorine or chlorine, or an alkenyloxy having 2 to 12 carbon atoms in which at least one hydrogen is replaced with fluorine or chlorine; 3 or 4. The liquid crystal composition according to any one of claims 1 to 5, comprising at least one compound selected from compounds represented by formulas (2-1) to (2-35) as a first component. .

In the formula (2-1) to the formula (2-35), R ^2a is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons.   The liquid crystal composition according to claim 5 or 6, wherein the ratio of the first component is in the range of 10% by mass to 85% by mass. The liquid crystal composition according to claim 1, comprising at least one compound selected from compounds represented by formula (3) as the second component.

In Formula (3), R ^3a and R ^3b are alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or at least one hydrogen is replaced by fluorine or chlorine Alkenyl having 2 to 12 carbon atoms; ring B and ring C may be 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, or 2,5-difluoro-1,4. -Phenylene; Z ^3a is a single bond, ethylene, vinylene, methyleneoxy, or carbonyloxy; b is 1, 2, or 3. The liquid crystal composition according to claim 1, comprising at least one compound selected from compounds represented by formulas (3-1) to (3-13) as a second component. .

In the formulas (3-1) to (3-13), R ^3a and R ^3b are each an alkyl having 1 to 12 carbons, an alkoxy having 1 to 12 carbons, an alkenyl having 2 to 12 carbons, or at least one Hydrogen is alkenyl having 2 to 12 carbon atoms replaced by fluorine or chlorine.   The liquid crystal composition according to claim 8 or 9, wherein the ratio of the second component is in the range of 10% by mass to 85% by mass. The liquid crystal composition according to any one of claims 1 to 10, comprising at least one compound selected from compounds represented by formula (4) as a third component.

In Formula (4), R ^4a and R ^4b are hydrogen, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or alkenyloxy having 2 to 12 carbons Ring D and Ring F are 1,4-cyclohexylene, 1,4-cyclohexenylene, tetrahydropyran-2,5-diyl, 1,4-phenylene, at least one hydrogen replaced with fluorine or chlorine 1,4-phenylene, naphthalene-2,6-diyl, naphthalene-2,6-diyl, chroman-2,6-diyl, in which at least one hydrogen is replaced by fluorine or chlorine, or at least one hydrogen is fluorine or Chroman-2,6-diyl substituted with chlorine; ring E is 2,3-difluoro-1,4-phenylene, 2- Loro-3-fluoro-1,4-phenylene, 2,3-difluoro-5-methyl-1,4-phenylene, 3,4,5-trifluoronaphthalene-2,6-diyl, 7,8-difluorochroman -2,6-diyl, 3,4,5,6-tetrafluorofluorene-2,7-diyl, 4,6-difluorodibenzofuran-3,7-diyl, 4,6-difluorodibenzothiophene-3,7- Diyl, or 1,1,6,7-tetrafluoroindane-2,5-diyl; Z ^4a and Z ^4b are a single bond, ethylene, vinylene, methyleneoxy, or carbonyloxy; c is 0; 1, 2 or 3; d is 0 or 1; and the sum of c and d is 3 or less. 12. The liquid crystal composition according to claim 1, comprising at least one compound selected from compounds represented by formulas (4-1) to (4-35) as a third component. .

In Formula (4-1) to Formula (4-35), R ^4a and R ^4b are hydrogen, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or carbon It is alkenyloxy of the number 2 to 12.   The liquid crystal composition according to claim 11 or 12, wherein the ratio of the third component is in the range of 3% by mass to 45% by mass.   The upper limit temperature of the nematic phase is 70 ° C. or higher, the optical anisotropy at a wavelength of 589 nm (measured at 25 ° C.) is 0.07 or higher, and the dielectric anisotropy at a frequency of 1 kHz (measured at 25 ° C.) is 2. The liquid crystal composition according to any one of claims 1 to 13, which is as described above.   The liquid crystal display element containing the liquid-crystal composition of any one of Claim 1 to 14.   The liquid crystal display according to claim 15, wherein an operation mode of the liquid crystal display element is a TN mode, an ECB mode, an OCB mode, an IPS mode, an FFS mode, or an FPA mode, and the driving method of the liquid crystal display element is an active matrix method. element.   Use of the liquid crystal composition according to claim 1 in a liquid crystal display device.