WO2013179966A1 - 誘電率異方性が負である液晶組成物、及び該液晶組成物を用いた液晶表示素子 - Google Patents
誘電率異方性が負である液晶組成物、及び該液晶組成物を用いた液晶表示素子 Download PDFInfo
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- C09K2019/3077—Cy-Cy-COO-Ph
Definitions
- the present invention relates to a liquid crystal composition having a negative dielectric anisotropy ( ⁇ ) useful as an electro-optical liquid crystal display material, and a liquid crystal display element using the liquid crystal composition.
- VA-LCD Vertically aligned VA-LCD (Vertical Alignment-Liquid Crystal Display) using a liquid crystal composition having negative dielectric anisotropy (negative ⁇ ) is capable of expressing jet black and has a display quality.
- a VA-LCD is also increasingly used in a passive matrix drive system used as a display for in-vehicle or home appliances. Since in-vehicle displays and the like are required to operate in a wide temperature range and maintain high display quality, it is desirable that the temperature dependence of the operating voltage of the liquid crystal composition be as flat as possible.
- a liquid crystal composition having a positive ⁇ it is relatively easy to flatten the temperature dependence of the operating voltage, and this can be achieved by improving the temperature dependence of the operating voltage in a high temperature region.
- As means for improving the temperature dependence of the operating voltage in the high temperature region there are a method of increasing the nematic transition temperature (T NI ) of the liquid crystal composition and a method of increasing the specific resistance value of the liquid crystal composition.
- T NI nematic transition temperature
- the temperature dependency of the operating voltage in a low temperature region must be improved. It has not been issued.
- liquid crystal compounds and liquid crystal compositions have been proposed as liquid crystal materials for VA-LCD, but no report has been made on combinations of liquid crystal compounds that flatten the temperature dependence of the operating voltage.
- An object of the present invention is to provide a liquid crystal composition having a flat operating voltage temperature dependency in a liquid crystal composition having a negative dielectric anisotropy and a liquid crystal display device using the same.
- the present invention contains a liquid crystal composition containing one or more compounds represented by general formula (I) and one or more compounds represented by general formula (II), and the same.
- a liquid crystal display element is provided.
- R 11 , R 12 , R 21 and R 22 are independently of each other an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms. These groups are, independently of one another, unsubstituted or have at least one halogen group as a substituent, and one or more — CH 2 — may independently be replaced by —O—, —S—, —CO—, —COO—, —OCO—, —OCO—O— as those in which oxygen atoms are not directly bonded to each other, A 11 , A 12 , A 21 and A 22 are independent of each other, (A) trans-1,4-cyclohexylene group (the one present in the group -CH 2 - or nonadjacent two or more -CH 2 - is -O- and / or -S- May be replaced) (B) 1,4-phenylene group (this is present in the group
- Z 11 , Z 21 and Z 22 are independently of each other —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —. , —CH ⁇ CH—, —C ⁇ C—, — (CH 2 ) 4 —, —CH ⁇ CH—CH 2 CH 2 —, —CH 2 CH 2 —CH ⁇ CH— or a single bond, a 11 , a 21 and a 22 each independently represent 0 or 1; )
- the liquid crystal composition of the present invention has a rate of change of the operating voltage with respect to the temperature within ⁇ 4% with respect to 25 ° C.
- R 11 , R 12 , R 21 and R 22 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl group having 2 to 8 carbon atoms.
- These groups are, independently of one another, unsubstituted or have at least one halogen group as substituent and one or more —CH 2 present in these groups - May be replaced by —O—, —S—, —CO—, —COO—, —OCO—, —OCO—O—, in which —oxygen atoms are not independently bonded to each other.
- an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms is preferable independently of each other, and an alkyl group having 1 to 5 carbon atoms or an alkyl group having 1 to 5 carbon atoms is mutually independent.
- Alkoxy groups are more preferred Yes. These groups are preferably unsubstituted.
- a 11 , A 12 , A 21 and A 22 are independent of each other, (A) trans-1,4-cyclohexylene group (the one present in the group -CH 2 - or nonadjacent two or more -CH 2 - is -O- and / or -S- May be replaced) (B) 1,4-phenylene group (this is present in the group one -CH 2 - or nonadjacent two or more -CH 2 - groups may be replaced by a-N-) (C) 1,4-cyclohexenylene, 1,4-bicyclo (2.2.2) octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl And a group selected from the group consisting of 1,2,3,4-tetrahydronaphthalene-2,6-diyl, wherein the hydrogen atoms on the groups (a), (b) and
- trans-1,4-cyclohexylene group or a 1,4-phenylene group is preferable independently of each other.
- a trans-1,4-cyclohexylene group is more preferable when it is desired to lower the viscosity.
- the 1,4-phenylene group is preferable.
- Each group is preferably unsubstituted.
- Z 11 , Z 21 and Z 22 are independently of each other —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —. , —CH ⁇ CH—, —C ⁇ C—, — (CH 2 ) 4 —, —CH ⁇ CH—CH 2 CH 2 —, —CH 2 CH 2 —CH ⁇ CH— or a single bond, In the invention, a single bond is preferable independently of each other.
- a 11, a 21 and a 22 each represents 0 or 1 independently of one another, independently of one another in the present invention, preferably a 11, a 21, a 22 is 0 in order to decrease the viscosity, transition When it is desired to increase the temperature, a 11 is preferably 1, and a 21 + a 22 is preferably 1 or 2.
- the liquid crystal composition of the present invention can contain one or more compounds represented by the general formula (III).
- R 31 and R 32 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, and these groups are Independently of each other, they are unsubstituted or have at least one halogen group as a substituent, and one or more —CH 2 — present in these groups is each independently
- the oxygen atoms may be replaced by —O—, —S—, —CO—, —COO—, —OCO—, —OCO—O— as those in which the oxygen atoms are not directly bonded to each other.
- an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms is preferable, and an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms is more preferable independently of each other. .
- These groups are preferably unsubstituted.
- a 31 , A 32 and A 33 are independent of each other, (A) trans-1,4-cyclohexylene group (the one present in the group -CH 2 - or nonadjacent two or more -CH 2 - is -O- and / or -S- May be replaced) (B) 1,4-phenylene group (this is present in the group one -CH 2 - or nonadjacent two or more -CH 2 - groups may be replaced by a-N-) (C) 1,4-cyclohexenylene, 1,4-bicyclo (2.2.2) octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl And a group selected from the group consisting of 1,2,3,4-tetrahydronaphthalene-2,6-diyl, wherein the hydrogen atoms on the groups (a), (b) and (c) are
- At least one of A 31 , A 32 and A 33 represents a 2,3-difluoro-1,4-phenylene group.
- a trans-1,4-cyclohexylene group is preferable when it is desired to reduce the viscosity independently of each other, and a 1,4-phenylene group or naphthalene-2,6 is preferable when the birefringence is increased.
- -Diyl is preferred, and when it is desired to increase the dielectric anisotropy / ⁇ /, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2, 6-diyl is preferred.
- Z 31 and Z 32 are independently of each other, —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CH ⁇ CH—, —C ⁇ C—, — (CH 2 ) 4 —, —CH ⁇ CH—CH 2 CH 2 —, —CH 2 CH 2 —CH ⁇ CH— or a single bond, Independently of each other, —CH 2 O—, —OCH 2 — or a single bond is preferable.
- the liquid crystal composition of the present invention can contain one or more compounds represented by the general formula (IV).
- R 41 and R 42 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl group having 2 to 8 carbon atoms, and these groups are Independently of each other, they are unsubstituted or have at least one halogen group as a substituent, and one or more —CH 2 — present in these groups is each independently
- the oxygen atoms may be replaced by —O—, —S—, —CO—, —COO—, —OCO—, —OCO—O— as those in which the oxygen atoms are not directly bonded to each other.
- an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms is preferable, and an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms is more preferable independently of each other. .
- These groups are preferably unsubstituted.
- a 41 , A 42 and A 43 are independent of each other, (A) trans-1,4-cyclohexylene group (the one present in the group -CH 2 - or nonadjacent two or more -CH 2 - is -O- and / or -S- May be replaced) (B) 1,4-phenylene group (this is present in the group one -CH 2 - or nonadjacent two or more -CH 2 - groups may be replaced by a-N-) (C) 1,4-cyclohexenylene, 1,4-bicyclo (2.2.2) octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl And a group selected from the group consisting of 1,2,3,4-tetrahydronaphthalene-2,6-diyl, wherein the hydrogen atoms on the groups (a), (b) and (c) are
- trans-1,4-cyclohexylene group is preferred when it is desired to lower the viscosity
- 1,4-phenylene group or naphthalene-2,6 is desired when the birefringence is increased.
- -Diyl is preferred.
- a 41 , A 42 and A 43 do not represent a 2,3-dihalo-1,4-phenylene group
- Z 41 and Z 42 are independently of each other —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CH ⁇ CH—, —C ⁇ C—, — (CH 2 ) 4 —, —CH ⁇ CH—CH 2 CH 2 —, —CH 2 CH 2 —CH ⁇ CH— or a single bond
- 41 and Z 42 are preferably a single bond when it is desired to reduce the viscosity independently of each other, and preferably —C ⁇ C— independently of each other when it is desired to increase the birefringence.
- a 41 each represents 0, 1, or 2
- a 42 is present twice in the case where a 41 represents 2 may be the same or different and present two when a 41 is 2 Z 32 may be the same or different, but in the present invention, 0 is preferable when it is desired to lower the viscosity, and 1 or 2 is preferable when it is desired to increase the transition temperature.
- 0 is preferable when it is desired to lower the viscosity
- 1 or 2 is preferable when it is desired to increase the transition temperature.
- the liquid crystal composition of the present invention can further contain compounds represented by formulas V and VI.
- R 51 and R 61 independently represent the same meaning as R 31 in the general formula (III), and R 52 and R 62 independently represent the same meaning as R 32 in the general formula (III). .
- a 51 , A 52 , A 53 , A 61 , A 62 and A 63 each independently represent a trans-1,4-cyclohexylene group, 1,4-phenylene group or 1,4-cyclohexenylene.
- One or more hydrogen atoms present on the 1,4-phenylene group may be independently substituted with halogen, but in the present invention, trans-1,4-cyclohexane is mutually independent.
- Hexylene group and 1,4-phenylene group are preferred, trans-1,4-cyclohexylene group is preferred for lowering the viscosity, and 1,4-phenylene group is preferred for increasing the birefringence. .
- Z 51 , Z 52 , Z 61 and Z 62 are independently of each other —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —CH 2.
- CH 2 —, —CH ⁇ CH—, —C ⁇ C—, — (CH 2 ) 4 —, —CH ⁇ CH—CH 2 CH 2 —, —CH 2 CH 2 —CH ⁇ CH— or a single bond is represented.
- —CH 2 O—, —OCH 2 — or a single bond is preferable independently of each other.
- a 51 , a 52 , a 61 and a 62 independently represent 0, 1 or 2; a 51 + a 52 represents 0, 1 or 2; a 61 + a 62 represents 0, 1 or 2
- a 51 represents 2
- two A 51s may be the same or different, and when a 52 represents 2, two A 52s may be the same or different.
- two Z 51 may be the same or different, and when a 52 represents 2, the two Z 52 may be the same or different.
- a 61 present two when a 61 represents 2 may be different even in the same, a 62 present two when a 62 represents 2 may be the same may also be different, Z 61 present two when a 61 represents 2 different even in the same Even if well, Z 62 present two when a 62 represents 2 may be the same or different.
- a 51 + a 52 and a 61 + a 62 are preferably 1 or 2.
- R 71 represents the same meaning as R 41 in the general formula (IV)
- R 72 represents the same meaning as R 42 in the general formula (IV)
- a 71 represents 0 or 1
- a 71 represents When it is desired to lower the viscosity, 0 is preferable, and when it is desired to increase the transition temperature, 1 is preferable.
- the liquid crystal composition of the present invention contains ordinary nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, ultraviolet absorbers, polymerizable monomers, etc., in addition to the above compounds, as long as the effects of the present invention are not impaired. can do.
- the liquid crystal composition of the present invention preferably does not contain a liquid crystal compound having a partial structure in which heteroatoms such as —O—O—, —O—S—, and —S—S— are directly bonded to each other.
- the polymerizable monomer that can be contained in the liquid crystal composition of the present invention is preferably a photopolymerizable monomer.
- the content of the photopolymerizable monomer in the liquid crystal composition of the present invention is preferably 500 to 5000 ppm.
- the photopolymerizable monomer include monomers having a polymerizable unsaturated double bond such as acrylic acid ester and methacrylic acid ester.
- T ni of the liquid crystal composition of the present invention is preferably 60 to 120 ° C., and the lower limit is more preferably 65 ° C., and 70 ° C. Is particularly preferred.
- 110 degreeC is more preferable and 105 degreeC is especially preferable.
- ⁇ at 25 ° C. is preferably ⁇ 1.5 to ⁇ 6.0, more preferably ⁇ 2.0 to ⁇ 5.0, and particularly preferably ⁇ 2.0 to ⁇ 3.5.
- ⁇ n at 25 ° C. is preferably 0.08 to 0.13, more preferably 0.09 to 0.12. More specifically, ⁇ n at 25 ° C.
- the viscosity ( ⁇ ) at 20 ° C. is preferably 10 to 30 mPa ⁇ s, more preferably 10 to 25 mPa ⁇ s, and particularly preferably 10 to 20 mPa ⁇ s.
- T ni of the liquid crystal composition of the present invention is preferably 60 to 120 ° C. for consumer use, and the lower limit is more preferably 65 ° C. Preferably, 70 ° C. is particularly preferable. As an upper limit, 90 degreeC is more preferable and 80 degreeC is especially preferable. In in-vehicle applications, the lower limit is more preferably 90 ° C, and particularly preferably 100 ° C. As an upper limit, 115 degreeC is more preferable and 105 degreeC is especially preferable. ⁇ n at 25 ° C. is preferably 0.08 to 0.13, and particularly preferably 0.08 to 0.11 for low duty driving.
- ⁇ at 25 ° C. is preferably ⁇ 2.0 to ⁇ 7.0, and particularly preferably ⁇ 2.5 to ⁇ 5.5 in the low duty driving.
- ⁇ at 20 ° C. is preferably 10 to 40 mPa ⁇ s, more preferably 10 to 30 mPa ⁇ s, and particularly preferably 10 to 25 mPa ⁇ s.
- T ni , ⁇ , and ⁇ n of the liquid crystal composition of the present invention are suitable for the intended use of the liquid crystal composition by adjusting the composition ratio of various compounds including the first component and the second component, respectively.
- the range can be adjusted as appropriate.
- T ni is 70 ° C. to 120 ° C.
- ⁇ at ⁇ 25 to 1 ° C. is ⁇ 1.5 to ⁇ 8.0
- ⁇ n at 25 ° C. and 589 nm is 0.080 to It is preferably 0.250.
- T ni , ⁇ , and ⁇ n are within these ranges, they can be suitably used for various applications.
- liquid crystal display element having a vertical alignment ability can be produced.
- a liquid crystal display element having a pretilt angle of 80 ° to 90 ° can be manufactured.
- T ni Nematic-isotropic transition temperature [° C.]
- T ⁇ N Solid or smectic-nematic transition temperature [° C.]
- ⁇ n refractive index anisotropy (589 nm, 25 ° C.)
- n 0 ordinary light refractive index (589 nm, 25 ° C.)
- ⁇ dielectric anisotropy (1 kHz, 25 ° C.)
- ⁇ ⁇ Dielectric constant in the direction perpendicular to the molecular axis (1 kHz, 25 ° C)
- ⁇ Bulk flow viscosity [mPa ⁇ s] (20 ° C.)
- Response speed A liquid crystal composition was injected into a vertical alignment cell having a gap of 3.5 ⁇ m and a pretilt angle of 89 °, and measured with a 5 V, 100 Hz rectangular wave temperature characteristics (temperature dependence of operating voltage): Vth at ⁇ 20 ° C. (
- a liquid crystal composition having the composition shown in Table 1 was produced, and the temperature dependence of the operating voltage of the liquid crystal composition was compared.
- the liquid crystal composition of the present invention is useful for a liquid crystal display element, useful for an active matrix driving liquid crystal display element and a passive matrix driving liquid crystal display element, and particularly useful for a passive matrix driving liquid crystal display element. Further, it can be used for a liquid crystal display element for VA mode, PSVA mode, IPS mode or ECB mode.
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Abstract
Description
A11、A12、A21及びA22は互いに独立して、
(a) トランス-1,4-シクロへキシレン基(この基中に存在する1個の-CH2-又は隣接していない2個以上の-CH2-は-O-及び/又は-S-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-CH2-又は隣接していない2個以上の-CH2-基は-N-に置き換えられてもよい)
(c) 1,4-シクロヘキセニレン、1,4-ビシクロ(2.2.2)オクチレン、ピペリジン-1,4-ジイル、ナフタレン-2,6-ジイル、デカヒドロナフタレン-2,6-ジイル及び1,2,3,4-テトラヒドロナフタレン-2,6-ジイル
からなる群より選ばれる基を表すが、上記の基(a)、基(b)及び基(c)上の水素原子は互いに独立して炭素原子数1~3のアルキル基、炭素原子数2~3のアルケニル基、炭素原子数1~3のアルコキシル、炭素原子数1~3のアルケニルオキシ基、CN又はハロゲンで置換されていてもよく、
Z11、Z21及びZ22は互いに独立して、-COO-、-OCO-、-CH2O-、-OCH2-、-CF2O-、-OCF2-、-CH2CH2-、-CH=CH-、-C≡C-、-(CH2)4-、-CH=CH-CH2CH2-、-CH2CH2-CH=CH-又は単結合を表し、
a11、a21及びa22は互いに独立して0又は1を表す。)
本発明の液晶組成物は、動作電圧の温度に対する変化率が25℃から-20℃の範囲で25℃を基準に±4%以内であり、低温域での表示品位改善に有効な液晶組成物である。このため、寒冷地や屋外での使用を想定した車載表示機やモバイル用途に適したものである。
<一般式(I)~(II)で表される化合物>
一般式(I)で表される化合物を1種類又は2種類以上含有し、一般式(II)で表される化合物を1種類又は2種類以上含有する液晶組成物。
(a) トランス-1,4-シクロへキシレン基(この基中に存在する1個の-CH2-又は隣接していない2個以上の-CH2-は-O-及び/又は-S-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-CH2-又は隣接していない2個以上の-CH2-基は-N-に置き換えられてもよい)
(c) 1,4-シクロヘキセニレン、1,4-ビシクロ(2.2.2)オクチレン、ピペリジン-1,4-ジイル、ナフタレン-2,6-ジイル、デカヒドロナフタレン-2,6-ジイル及び1,2,3,4-テトラヒドロナフタレン-2,6-ジイル
からなる群より選ばれる基を表すが、上記の基(a)、基(b)及び基(c)上の水素原子は互いに独立して炭素原子数1~3のアルキル基、炭素原子数2~3のアルケニル基、炭素原子数1~3のアルコキシル、炭素原子数1~3のアルケニルオキシ基、CN又はハロゲンで置換されていてもよい。本発明においては互いに独立してトランス-1,4-シクロへキシレン基または1,4-フェニレン基が好ましく、粘度を低くしたい場合にはトランス-1,4-シクロへキシレン基がより好ましく、複屈折率異方性を大きくしたい場合には1,4-フェニレン基より好ましい。またそれぞれの基は非置換が好ましい。
本発明の液晶組成物は、一般式(III)で表される化合物を1種類又は2種類以上含有することができる。
(a) トランス-1,4-シクロへキシレン基(この基中に存在する1個の-CH2-又は隣接していない2個以上の-CH2-は-O-及び/又は-S-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-CH2-又は隣接していない2個以上の-CH2-基は-N-に置き換えられてもよい)
(c) 1,4-シクロヘキセニレン、1,4-ビシクロ(2.2.2)オクチレン、ピペリジン-1,4-ジイル、ナフタレン-2,6-ジイル、デカヒドロナフタレン-2,6-ジイル及び1,2,3,4-テトラヒドロナフタレン-2,6-ジイル
からなる群より選ばれる基を表すが、上記の基(a)、基(b)及び基(c)上の水素原子は互いに独立して炭素原子数1~3のアルキル基、炭素原子数2~3のアルケニル基、炭素原子数1~3のアルコキシル、炭素原子数1~3のアルケニルオキシ基、CN又はハロゲンで置換されていてもよいが、A31、A32及びA33のうち少なくとも一つは2,3-ジフルオロ-1,4-フェニレン基を表す。本発明においては、互いに独立して粘度を低くしたい場合にはトランス-1,4-シクロへキシレン基が好ましく、複屈折率を大きくしたい場合には1,4-フェニレン基またはナフタレン-2,6-ジイルが好ましく、誘電率異方性/Δε/を大きくしたい場合にはナフタレン-2,6-ジイル、デカヒドロナフタレン-2,6-ジイル及び1,2,3,4-テトラヒドロナフタレン-2,6-ジイルが好ましい。
本発明の液晶組成物は一般式(IV)で表される化合物を1種類又は2種類以上含有することができる。
(a) トランス-1,4-シクロへキシレン基(この基中に存在する1個の-CH2-又は隣接していない2個以上の-CH2-は-O-及び/又は-S-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-CH2-又は隣接していない2個以上の-CH2-基は-N-に置き換えられてもよい)
(c) 1,4-シクロヘキセニレン、1,4-ビシクロ(2.2.2)オクチレン、ピペリジン-1,4-ジイル、ナフタレン-2,6-ジイル、デカヒドロナフタレン-2,6-ジイル及び1,2,3,4-テトラヒドロナフタレン-2,6-ジイル
からなる群より選ばれる基を表すが、上記の基(a)、基(b)及び基(c)上の水素原子は互いに独立して炭素原子数1~3のアルキル基、炭素原子数2~3のアルケニル基、炭素原子数1~3のアルコキシル、炭素原子数1~3のアルケニルオキシ基、CN又はハロゲンで置換されていてもよい。本発明においては互いに独立して、粘度を低くしたい場合にはトランス-1,4-シクロへキシレン基が好ましく、複屈折率を大きくしたい場合には1,4-フェニレン基またはナフタレン-2,6-ジイルが好ましい。
Z41及びZ42は互いに独立して、-COO-、-OCO-、-CH2O-、-OCH2-、-CF2O-、-OCF2-、-CH2CH2-、-CH=CH-、-C≡C-、-(CH2)4-、-CH=CH-CH2CH2-、-CH2CH2-CH=CH-又は単結合を表すが、本発明においてZ41及びZ42は、互いに独立して粘度を低くしたい場合には単結合が好ましく、複屈折率を大きくしたい場合には互いに独立して-C≡C-が好ましい。
<一般式(V)(VI)で表される化合物>
本発明の液晶組成物は、式V、VIで表される化合物をさらに含有することができる。
<一般式(VII)で表される化合物>
本発明の液晶組成物は、一般式(VII)で表される化合物として一般式(VII)で表される化合物を1種類又は2種類以上含有することができる。
Tni : ネマティック-アイソトロピック転移温度[℃]
T→N : 固体又はスメクチック-ネマティック転移温度[℃]
Δn : 屈折率異方性(589nm, 25℃)
n0 : 常光屈折率(589nm, 25℃)
Δε : 誘電率異方性(1kHz, 25℃)
ε⊥ : 分子軸に対して垂直方向の誘電率(1kHz, 25℃)
η : バルクフロー粘度[mPa・s](20℃)
応答速度 : 液晶組成物をギャップ3.5μm、プレチルト角89°の垂直配向セルに注入し、5V、100Hz矩形波にて測定
電圧温特(動作電圧の温度依存性):-20℃におけるVth(閾値電圧(V))を25℃におけるVthで割った値で評価
実施例中の化合物記載に下記略号を使用する。
-n(数字) : -CnH2n+1(アルキル側鎖は数字、代表するときはRとする。)
-On : -OCnH2n+1
-ndm : -(CnH2n+1-C=C-(CH2)m-1)
ndm- : CnH2n+1-C=C-(CH2)m-1-
-nOm : -(CH2)nOCmH2m+1
nOm- : CnH2n+1O(CH2)m-
-Od(m)n : -O(CnH2n+1-C=C-(CH2)m-2)
d(m)nO- : CnH2n+1-C=C-(CH2)m-2O-
連結基略号を以下に示す。
-T- : -C≡C-
-2- : -CH2CH2-
-1O- : -CH2-O-
-O1- : -O-CH2-
-VO- : -COO-
環略号を以下に示す。
Claims (12)
- 一般式(I)で表される化合物を1種類又は2種類以上含有し、一般式(II)で表される化合物を1種類又は2種類以上含有する液晶組成物。
A11、A12、A21及びA22は互いに独立して、
(a) トランス-1,4-シクロへキシレン基(この基中に存在する1個の-CH2-又は隣接していない2個以上の-CH2-は-O-及び/又は-S-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-CH2-又は隣接していない2個以上の-CH2-基は-N-に置き換えられてもよい)
(c) 1,4-シクロヘキセニレン、1,4-ビシクロ(2.2.2)オクチレン、ピペリジン-1,4-ジイル、ナフタレン-2,6-ジイル、デカヒドロナフタレン-2,6-ジイル及び1,2,3,4-テトラヒドロナフタレン-2,6-ジイル
からなる群より選ばれる基を表すが、上記の基(a)、基(b)及び基(c)上の水素原子は互いに独立して炭素原子数1~3のアルキル基、炭素原子数2~3のアルケニル基、炭素原子数1~3のアルコキシル、炭素原子数1~3のアルケニルオキシ基、CN又はハロゲンで置換されていてもよく、
Z11、Z21及びZ22は互いに独立して、-COO-、-OCO-、-CH2O-、-OCH2-、-CF2O-、-OCF2-、-CH2CH2-、-CH=CH-、-C≡C-、-(CH2)4-、-CH=CH-CH2CH2-、-CH2CH2-CH=CH-又は単結合を表し、
a11、a21及びa22は互いに独立して0又は1を表す。) - 一般式(III)で表される化合物を1種類又は2種類以上含有する請求項1記載の液晶組成物。
A31、A32及びA33は互いに独立して、
(a) トランス-1,4-シクロへキシレン基(この基中に存在する1個の-CH2-又は隣接していない2個以上の-CH2-は-O-及び/又は-S-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-CH2-又は隣接していない2個以上の-CH2-基は-N-に置き換えられてもよい)
(c) 1,4-シクロヘキセニレン、1,4-ビシクロ(2.2.2)オクチレン、ピペリジン-1,4-ジイル、ナフタレン-2,6-ジイル、デカヒドロナフタレン-2,6-ジイル及び1,2,3,4-テトラヒドロナフタレン-2,6-ジイル
からなる群より選ばれる基を表すが、上記の基(a)、基(b)及び基(c)上の水素原子は互いに独立して炭素原子数1~3のアルキル基、炭素原子数2~3のアルケニル基、炭素原子数1~3のアルコキシル、炭素原子数1~3のアルケニルオキシ基、CN又はハロゲンで置換されていてもよいが、A31、A32及びA33のうち少なくとも一つは2,3-ジフルオロ-1,4-フェニレン基、1,7,8-トリフルオロナフタレン-2,6-ジイル基又は3,4,5-トリフルオロナフタレン-2,6-ジイル基を表し、
Z31及びZ32は互いに独立して、-COO-、-OCO-、-CH2O-、-OCH2-、-CF2O-、-OCF2-、-CH2CH2-、-CH=CH-、-C≡C-、-(CH2)4-、-CH=CH-CH2CH2-、-CH2CH2-CH=CH-又は単結合を表し、
a31は0、1又は2を表すが、a31が2を表す場合に2個存在するA32は同一であっても異なっていてもよく、a31が2を表す場合に2個存在するZ32は同一であっても異なっていてもよいが、一般式(III)が一般式(I)で表される化合物及び一般式(II)で表される化合物を表すことはない。) - 一般式(IV)で表される化合物を1種類又は2種類以上含有する請求項1又は2記載の液晶組成物。
A41、A42及びA43は互いに独立して、
(a) トランス-1,4-シクロへキシレン基(この基中に存在する1個の-CH2-又は隣接していない2個以上の-CH2-は-O-及び/又は-S-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-CH2-又は隣接していない2個以上の-CH2-基は-N-に置き換えられてもよい)
(c) 1,4-シクロヘキセニレン、1,4-ビシクロ(2.2.2)オクチレン、ピペリジン-1,4-ジイル、ナフタレン-2,6-ジイル、デカヒドロナフタレン-2,6-ジイル及び1,2,3,4-テトラヒドロナフタレン-2,6-ジイル
からなる群より選ばれる基を表すが、上記の基(a)、基(b)及び基(c)上の水素原子は互いに独立して炭素原子数1~3のアルキル基、炭素原子数2~3のアルケニル基、炭素原子数1~3のアルコキシル、炭素原子数1~3のアルケニルオキシ基、CN又はハロゲンで置換されていてもよいが、A41、A42及びA43は2,3-ジハロ-1,4-フェニレン基を表すことはなく、
Z41及びZ42は互いに独立して、-COO-、-OCO-、-CH2O-、-OCH2-、-CF2O-、-OCF2-、-CH2CH2-、-CH=CH-、-C≡C-、-(CH2)4-、-CH=CH-CH2CH2-、-CH2CH2-CH=CH-又は単結合を表し、
A41は0、1又は2を表すが、a41が2を表す場合に2個存在するA42は同一であっても異なっていてもよく、a41が2を表す場合に2個存在するZ32は同一であっても異なっていてもよい。) - 一般式(III)で表される化合物として、一般式(V)で表される化合物及び一般式(VI)からなる群から選ばれる化合物を1種類又は2種類以上含有する請求項2又は3に記載の液晶組成物。
A51、A52、A53、A61、A62及びA63は互いに独立してトランス-1,4-シクロへキシレン基、1,4-フェニレン基又は1,4-シクロヘキセニレンを表すが、1,4-フェニレン基上に存在する1個又は2個以上の水素原子は互いに独立してハロゲンで置換されていてもよく、
Z51、Z52、Z61及びZ62は互いに独立して、-COO-、-OCO-、-CH2O-、-OCH2-、-CF2O-、-OCF2-、-CH2CH2-、-CH=CH-、-C≡C-、-(CH2)4-、-CH=CH-CH2CH2-、-CH2CH2-CH=CH-又は単結合を表し、
a51、a52、a61及びa62は互いに独立して0、1又は2を表すが、a51+a52は0、1又は2を表し、a61+a62は0、1又は2を表し、a51が2を表す場合に2個存在するA51は同一であっても異なっていてもよく、a52が2を表す場合に2個存在するA52は同一であっても異なっていてもよく、a51が2を表す場合に2個存在するZ51は同一であっても異なっていてもよく、a52が2を表す場合に2個存在するZ52は同一であっても異なっていてもよく、a61が2を表す場合に2個存在するA61は同一であっても異なっていてもよく、a62が2を表す場合に2個存在するA62は同一であっても異なっていてもよく、a61が2を表す場合に2個存在するZ61は同一であっても異なっていてもよく、a62が2を表す場合に2個存在するZ62は同一であっても異なっていてもよい。) - 一般式(I)で表される化合物、一般式(II)で表される化合物及び一般式(III)で表される化合物の総量が液晶組成物全体の50質量%から100質量%である請求項2~5のいずれか1項に記載の液晶組成物。
- ネマティック-アイソトロピック転移温度が70℃~120℃、誘電率異方性が-1.5~-8.0及び複屈折率が0.080~0.250である請求項1~6のいずれか1項に記載の液晶組成物。
- モノマーを500~5000ppm含有する請求項1~7のいずれか1項に記載の液晶組成物。
- 請求項1~8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。
- プレチルト角が80°ないし90°である請求項9に記載の液晶表示素子。
- アクティブマトリクス駆動型である請求項9又は10に記載の液晶表示素子。
- パッシブマトリクス駆動型である請求項9又は10に記載の液晶表示素子
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WO2018193860A1 (ja) * | 2017-04-18 | 2018-10-25 | Dic株式会社 | 液晶組成物及び液晶表示素子 |
JP2021020974A (ja) * | 2019-07-24 | 2021-02-18 | Dic株式会社 | 組成物及びそれを使用した液晶表示素子 |
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