WO2010058681A1 - Milieu cristal liquide optiquement isotrope et élément optique correspondant - Google Patents

Milieu cristal liquide optiquement isotrope et élément optique correspondant Download PDF

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WO2010058681A1
WO2010058681A1 PCT/JP2009/068393 JP2009068393W WO2010058681A1 WO 2010058681 A1 WO2010058681 A1 WO 2010058681A1 JP 2009068393 W JP2009068393 W JP 2009068393W WO 2010058681 A1 WO2010058681 A1 WO 2010058681A1
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Prior art keywords
liquid crystal
alkyl
replaced
hydrogen
crystal composition
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PCT/JP2009/068393
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English (en)
Japanese (ja)
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長谷場　康宏
國信　隆史
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チッソ株式会社
チッソ石油化学株式会社
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Application filed by チッソ株式会社, チッソ石油化学株式会社 filed Critical チッソ株式会社
Priority to US13/129,578 priority Critical patent/US8501285B2/en
Priority to CN200980145801.4A priority patent/CN102216424B/zh
Priority to JP2010539193A priority patent/JP5477296B2/ja
Priority to EP09827462.4A priority patent/EP2360229B1/fr
Publication of WO2010058681A1 publication Critical patent/WO2010058681A1/fr
Priority to US13/927,128 priority patent/US8686196B2/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/20—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/58—Dopants or charge transfer agents
    • C09K19/586—Optically active dopants; chiral dopants
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/58—Dopants or charge transfer agents
    • C09K19/586—Optically active dopants; chiral dopants
    • C09K19/588—Heterocyclic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K2019/0444—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K2019/0444—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group
    • C09K2019/0466—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group the linking chain being a -CF2O- chain
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Definitions

  • the present invention relates to a liquid crystal medium useful as a material for an optical element. Specifically, the present invention relates to a liquid crystal medium having a wide liquid crystal phase temperature range, a large dielectric anisotropy, and a refractive index anisotropy. In addition, the present invention relates to an optical element using the liquid crystal medium. Specifically, the present invention relates to an optical element that can be used in a wide temperature range, can be driven at a low voltage, and can obtain a high-speed electro-optic response.
  • An optical element refers to various elements that perform functions such as optical modulation and optical switching using the electro-optic effect. For example, display elements (liquid crystal display elements), optical communication systems, optical information processing, and various sensors. The light modulation element used for a system is mentioned.
  • Liquid crystal display elements using a liquid crystal composition are widely used in displays such as watches, calculators, word processors and the like. These liquid crystal display elements utilize the refractive index anisotropy and dielectric anisotropy of liquid crystal compounds.
  • PC phase change
  • TN twisted nematic
  • STN super twisted nematic
  • BTN Battery twisted nematic
  • ECB mainly using one or more polarizing plates
  • ECB Known are electrically controlled birefringence (OCB), optically compensated bend (OCB), in-plane switching (IPS), and vertical alignment (VA).
  • OCB electrically controlled birefringence
  • OCB optically compensated bend
  • IPS in-plane switching
  • VA vertical alignment
  • a mode in which an electric field is applied in an optically isotropic liquid crystal phase to develop electric birefringence has been actively studied (Patent Documents 1 to 9, Non-Patent Documents 1 to 3).
  • wavelength tunable filters, wavefront control elements, liquid crystal lenses, aberration correction elements, aperture control elements, optical head devices, etc. that utilize electrical birefringence in the blue phase, which is one of the optically isotropic liquid crystal phases, have been proposed.
  • Patent Documents 10 to 12 The classification based on the element driving method is PM (passive matrix) and AM (active matrix). PM (passive matrix) is classified into static and multiplex, and AM is classified into TFT (thin film transistor) and MIM (metal insulator metal).
  • liquid crystal display elements contain a liquid crystal composition having appropriate physical properties.
  • the liquid crystal composition preferably has appropriate physical properties.
  • General physical properties necessary for the liquid crystal compound which is a component of the liquid crystal composition are as follows. (1) being chemically stable and physically stable; (2) having a high clearing point (liquid crystal phase-isotropic phase transition temperature); (3) The lower limit temperature of the liquid crystal phase (nematic phase, cholesteric phase, smectic phase, blue phase or other optically isotropic liquid crystal phase) is low, (4) Excellent compatibility with other liquid crystal compounds, (5) having an appropriate amount of dielectric anisotropy; (6) having an appropriate refractive index anisotropy; It is.
  • a liquid crystal compound having a large dielectric anisotropy and refractive index anisotropy is preferable from the viewpoint of reducing driving voltage.
  • the voltage holding ratio can be increased.
  • the temperature range of a nematic phase or an optically isotropic liquid crystal phase is set. It can be expanded and can be used as a display element in a wide temperature range.
  • the liquid crystal compound is generally used as a liquid crystal composition prepared by mixing with many other liquid crystal compounds in order to develop characteristics that are difficult to be exhibited by a single compound.
  • the liquid crystal compound used in the liquid crystal display element preferably has good compatibility with other liquid crystal compounds and the like as shown in (4).
  • the liquid crystal display elements that have particularly higher display performance such as contrast, display capacity, response time characteristics, and the like.
  • a liquid crystal composition having a low driving voltage is required for the liquid crystal material used.
  • Patent Documents 1 to 3 and Non-Patent Documents 1 to 3 disclose the voltage required for the operation of the element.
  • Patent Documents 4 to 9 disclose an optically isotropic liquid crystal composition and a polymer / liquid crystal composite material in which a reduction in operating voltage is expected from the above, the optically isotropic liquid crystal composition of the present application is disclosed. There is no description pronounced of materials and polymer / liquid crystal composite materials.
  • JP 2003-327966 A International Publication No. 2005/90520 Pamphlet JP 2005-336477 A JP 2006-89622 A JP 2006-299084 A JP 2006-506477 A JP 2006-506515 A International Publication No. 2006/063662 Pamphlet JP 2006-225655 A JP-A-2005-157109 International Publication No. 2005/80529 Pamphlet JP 2006-127707 A
  • the first object of the present invention is to provide an optically isotropic liquid crystal phase having stability to heat, light, etc., a wide liquid crystal phase temperature range, a large refractive index anisotropy, and a large dielectric anisotropy. It is to provide a liquid crystal medium having the same.
  • the second object is to provide various optical elements that contain this liquid crystal medium, can be used in a wide temperature range, have a short response time, a large contrast, and a low driving voltage.
  • liquid crystal composition having an optically isotropic liquid crystal phase mainly comprising a compound comprising a CF 2 O— linking group is suitable.
  • the present invention provides the following liquid crystal medium (liquid crystal composition or polymer / liquid crystal composite), an optical element containing the liquid crystal medium, and the like.
  • a liquid crystal composition comprising an achiral component T containing a compound represented by the formula (1) and a chiral agent and exhibiting an optically isotropic liquid crystal phase.
  • R 1 is hydrogen or alkyl having 1 to 20 carbon atoms, and any —CH 2 — in the alkyl is —O—, —S—, —COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF—, or —C ⁇ C— may be substituted, and any —CH 2 — in the alkyl or alkyl may be replaced by —O—, —S—, —COO—.
  • Any hydrogen in the group replaced by —OCO—, —CH ⁇ CH—, —CF ⁇ CF— or —C ⁇ C— may be replaced by halogen or alkyl having 1 to 3 carbons;
  • Z 1 , Z 2 , and Z 3 are each independently a single bond, —COO— or —CF 2 O—, but at least one is —CF 2 O—;
  • L 1 , L 2 , L 3, L 4, and L 5 are independently hydrogen or fluorine;
  • any —CH 2 — in the alkyl and in the alkyl may be —O—, —S—, —COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF— or — Any
  • R 1 is alkyl having 1 to 20 carbon atoms, alkenyl having 2 to 21 carbon atoms, alkynyl having 2 to 21 carbon atoms, alkoxy having 1 to 19 carbon atoms, or 2 to 20 carbon atoms.
  • X 1 is hydrogen, halogen, —SF 5 , —CH 2 F, —CHF 2 , —CF 3 , — (CH 2 ) 2 —F, —CF 2 CH 2 F, —CF 2 CHF 2 , —CH 2 CF 3 , —CF 2 CF 3 , — (CH 2 ) 3 —F, — (CF 2 ) 3 —F, —CF 2 CHFCF 3 , —CHFCF 2 CF 3 , — (CH 2 ) 4 —F, — (CF 2 ) 4 -F, — (CF 2 ) 4 -F, — (CF 2 ) 4 -F,-(CH 2 ) 5 -F,-(CF 2
  • R1 are a group represented by any one of formulas (CHN-1) to (CHN-19), and R 1a is hydrogen or alkyl having 1 to 20 carbons.
  • the liquid crystal composition according to any one of [3].
  • the liquid crystal composition according to item [1], comprising at least one compound selected from the group of compounds represented by formulas (1-1) to (1-3).
  • R 1 is a group represented by any one of formulas (CHN-1) to (CHN-19), R 1a is hydrogen or alkyl having 1 to 20 carbons; L 1 , L 2 , L 3 , L 4 and L 5 are independently hydrogen or fluorine;
  • X 1 is fluorine, chlorine, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , — OCHF 2 , —OCH 2 F, —OCF 2 CFHCF 3 or —CH ⁇ CHCF 3 )
  • R 1 is any one of the formulas (CHN-1) to (CHN-4) and (CHN-6) to (CHN-8).
  • L 6 , L 7 , and L 8 are independently hydrogen or fluorine;
  • X 2 is fluorine, chlorine, —CF 3 , — CHF 2, -CH 2 F, -OCF 3, -OCHF 2, -OCH 2 F, -OCF 2 CFHCF 3
  • l, m, n, o, and p are independently 0 or 1, and l + m + n + o + p ⁇ 4).
  • R 2 is hydrogen or alkyl having 1 to 20 carbon atoms, and any —CH 2 — in the alkyl is —O—, —S—, —COO—, —OCO. —, —CH ⁇ CH—, —CF ⁇ CF— or —C ⁇ C— may be substituted, and any —CH 2 — in the alkyl or alkyl may be replaced by —O—, —S—, — Any hydrogen in the group replaced with COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF— or —C ⁇ C— may be replaced with halogen or alkyl having 1 to 3 carbon atoms.
  • L 6, L 7, and L 8 are independently hydrogen or halogen;
  • X 2 Is hydrogen, halogen, —C ⁇ N, —N ⁇ C ⁇ S, —C ⁇ C—C ⁇ N, —SF 5 , or alkyl having 1 to 10 carbon atoms, and in this alkyl, any —CH 2 — May be replaced by —O—, —S—, —CH ⁇ CH—, or —C ⁇ C—, and any —CH 2 — in the alkyl and in the alkyl is —O—, — Any hydrogen
  • the achiral component T comprises 5 to 95% by weight of the compound represented by the formula (1), 5 to 80% by weight of the compound represented by the formula (2), and 0 to 50% by weight of other compounds.
  • Item 10 The liquid crystal composition according to any one of items [1] to [9],
  • the achiral component T comprises 5 to 94% by weight of the compound represented by the formula (1), 5 to 80% by weight of the compound represented by the formula (2), and 1 to 50% by weight of other compounds.
  • Item 10 The liquid crystal composition according to any one of items [1] to [9],
  • the achiral component T contains 10 to 100% by weight of a compound selected from the group consisting of formulas (1-2A) to (1-2H) and formulas (1-3A) to (1-3D) A liquid crystal composition represented by any one of items [1] to [13].
  • R 1 is a chain selected from the formulas (CHN-1), (CHN-4), (CHN-7), (CHN-8) and (CHN-11);
  • X 1 is fluorine, chlorine, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 , —OCF 2 CFHCF 3 or —CH ⁇ CHCF 3 )
  • the achiral component T further contains at least one compound selected from the group of compounds represented by each of formulas (7), (8), (9), (10) and (11). Item 16.
  • the liquid crystal composition according to any one of items [1] to [14]. (In these formulas, R 5 and R 6 are independently alkyl having 1 to 10 carbons or alkenyl having 2 to 10 carbons, and any hydrogen in alkyl and alkenyl may be replaced by fluorine.
  • any —CH 2 — may be replaced by —O—;
  • ring D 1 , ring D 2 , ring D 3 and ring D 4 are independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, 1,4-phenylene in which arbitrary hydrogen is replaced by fluorine, tetrahydropyran -2,5-diyl, or decahydronaphthalene-2,6-diyl;
  • Z 13 , Z 14 , Z 15 , and Z 16 are independently-(C H 2 ) 2 —, —COO—, —CH 2 O—, —OCF 2 —, —OCF 2 (CH 2 ) 2 —, or a single bond;
  • L 13 and L 14 are independently fluorine or chlorine.
  • T, u, x, y, and z are independently 0 or
  • ring E 1, ring E 2, and Ring E 3 is independently 1,4-cyclohexylene, pyrimidine-2,5-diyl, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, or It is a 2,5-difluoro-1,4-phenylene;
  • the achiral component T further contains at least one compound selected from the group of compounds represented by each of the formulas (15), (16), (17) and (18). 14.
  • the liquid crystal composition according to any one of 14. (In these formulas, R 9 is alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons or alkynyl having 2 to 10 carbons, and in the alkyl, alkenyl and alkynyl, any hydrogen is replaced by fluorine.
  • X 5 is Fluorine, chlorine, —SF 5 , —OCF 3 , —OCHF 2 , —CF 3 , —CHF 2 , —CH 2 F, —OCF 2 CHF 2 , or —OCF 2 CHFCF 3 ;
  • ring F 1 , ring F 2, ring F 3 and ring F 4 are independently 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, pyrimidine-2,5-diisopropyl , Tetrahydropyran-2,5-diyl, 1,4-phenylene, naphthalene-2,6-diyl, 1,4-phenylene in which any hydrogen is replaced
  • the alkyl the alkenyl, alkynyl in or alkyl, any -CH 2 in the alkenyl, and groups in which arbitrary hydrogen in the alkynyl have been replaced with fluorine - may be replaced by -O-;
  • X 6 is —C ⁇ N, —N ⁇ C ⁇ S, or —C ⁇ C—C ⁇ N;
  • Ring G 1 , Ring G 2 and Ring G 3 are independently 1,4-cyclohexylene, 1,4 -Phenylene, 1,4-phenylene in which any hydrogen is replaced with fluorine or chlorine, Naphthalene-2,6-diyl, Any hydrogen is replaced with fluorine or chlorine Naphthalene-2,6-diyl, 1,3-dioxane-2,5-diyl, tetrahydropyran-2,5-diyl or pyrimidine-2,5-diyl,;
  • Z 22 is - (CH 2) 2 - , —COO
  • liquid crystal composition according to any one of items [1] to [24], comprising at least one antioxidant and / or ultraviolet absorber.
  • the liquid crystal composition is obtained by adding a chiral agent to a composition having a difference between the upper limit temperature and the lower limit temperature at which the chiral nematic phase and the non-liquid crystal isotropic phase coexist at 3 to 150 ° C. ,
  • a liquid crystal composition is obtained by adding a chiral agent to a composition in which the difference between the upper limit temperature and the lower limit temperature at which the chiral nematic phase and the non-liquid crystal isotropic phase coexist is 5 to 150 ° C. ,
  • the liquid crystal composition is obtained by adding a chiral agent to a composition in which the difference between the upper limit temperature and the lower limit temperature at which the nematic phase and the non-liquid crystal isotropic phase coexist is 3 to 150 ° C.,
  • the chiral agent comprises at least one compound selected from the group of compounds represented by formulas (K1) to (K5).
  • Any hydrogen in the alkyl may be replaced by halogen, and the terminal —CH 3 is May be replaced by;
  • A is independently an aromatic or non-aromatic 3- to 8-membered ring or a condensed ring having 9 or more carbon atoms, and any hydrogen in these rings is halogen, alkyl having 1 to 3 carbon atoms Or may be replaced by haloalkyl, the ring —CH 2 — may be replaced by —O—, —S— or —NH—, —CH ⁇ may be replaced by —N ⁇ ;
  • Any hydrogen in these rings may be replaced by halogen, alkyl of 1 to 3 carbon atoms or haloalkyl, —CH 2 — may be replaced by
  • the chiral agent is selected from the group of compounds represented by formulas (K2-1) to (K2-8), (K4-1) to (K4-6), and (K5-1) to (K5-3), respectively.
  • the liquid crystal composition according to any one of claims 31 to 33, comprising at least one selected compound.
  • R K is independently alkyl having 3 to 10 carbon atoms, and —CH 2 — adjacent to the ring in this alkyl may be replaced by —O—, and any —CH 2 — 2 — may be replaced by —CH ⁇ CH—.
  • a mixture comprising the liquid crystal composition according to any one of items [1] to [35] and a polymerizable monomer.
  • a polymer / liquid crystal composite material used for an element driven in an optically isotropic liquid crystal phase obtained by polymerizing the mixture according to item [36] or [37].
  • An optical device comprising an electrode disposed on one or both surfaces, a liquid crystal medium disposed between the substrates, and an electric field applying means for applying an electric field to the liquid crystal medium via the electrode,
  • An optical device comprising the liquid crystal composition according to any one of items [31] to [35] or the polymer / liquid crystal composite material according to any one of items [38] to [42].
  • An electrode is disposed on one or both surfaces, and at least one of the substrates has a pair of transparent substrates, a liquid crystal medium disposed between the substrates, and a polarizing plate disposed on the outside of the substrate.
  • An optical element comprising an electric field applying means for applying an electric field to the liquid crystal medium, wherein the liquid crystal medium is the liquid crystal composition or polymer / liquid crystal composite material according to any one of items [31] to [35]
  • An optical device wherein the polymer / liquid crystal composite material according to any one of Items [38] to [42].
  • each pixel includes an active element, and the active element is a thin film transistor (TFT).
  • TFT thin film transistor
  • the liquid crystal medium is a general term for a liquid crystal composition and a polymer / liquid crystal composite.
  • the optical element refers to various elements that perform functions such as light modulation and optical switching using the electro-optic effect.
  • a display element liquid crystal display element
  • an optical communication system Light modulation elements used in optical information processing and various sensor systems can be mentioned.
  • the Kerr effect is known for light modulation using a change in refractive index caused by voltage application to an optically isotropic liquid crystal medium.
  • the electric birefringence value is a refractive index anisotropy value induced when an electric field is applied to the isotropic medium.
  • a liquid crystal compound is a generic term for a compound having a liquid crystal phase such as a nematic phase or a smectic phase and a compound having no liquid crystal phase but useful as a component of a liquid crystal composition.
  • the chiral agent is an optically active compound and is added to give a desired twisted molecular arrangement to the liquid crystal composition.
  • a liquid crystal display element is a general term for a liquid crystal display panel and a liquid crystal display module.
  • a liquid crystal compound, a liquid crystal composition, and a liquid crystal display element may be abbreviated as a compound, a composition, and an element, respectively.
  • the upper limit temperature of the liquid crystal phase is the phase transition temperature of the liquid crystal phase-isotropic phase, and may simply be abbreviated as the clearing point or the upper limit temperature.
  • the lower limit temperature of the liquid crystal phase may be simply abbreviated as the lower limit temperature.
  • the compound represented by formula (1) may be abbreviated as compound (1). This abbreviation may also apply to compounds represented by formula (2) and the like.
  • symbols such as B, D, and E surrounded by hexagons correspond to Ring B, Ring D, and Ring E, respectively.
  • the amount of the compound expressed as a percentage is a weight percentage (% by weight) based on the total weight of the composition.
  • a plurality of the same symbols such as rings A 1 , Y 1 , and B are described in the same formula or different formulas, but these may be the same or different.
  • Alkyl in which any —CH 2 — may be replaced by —O— or —CH ⁇ CH— includes alkyl, alkenyl, alkoxy, alkoxyalkyl, alkoxyalkenyl, alkenyloxyalkyl, and the like.
  • the liquid crystal composition of the present invention exhibits stability against heat, light, etc., a high upper limit temperature and a lower lower limit temperature of an optically isotropic liquid crystal phase, and is low in an element driven with an optically isotropic liquid crystal phase. It has a driving voltage.
  • the polymer / liquid crystal composite material of the present invention having an optically isotropic liquid crystal phase exhibits a high maximum temperature and a low minimum temperature of the optically isotropic liquid crystal phase, and is optically isotropic.
  • the element driven in the liquid crystal phase has a low driving voltage.
  • the optical element driven by the optically isotropic liquid crystal phase of the present invention has a wide usable temperature range, a short response time, a large contrast ratio, and a low driving voltage.
  • the comb-shaped electrode substrate used in the Example is shown.
  • the optical system used in the Example is shown.
  • the liquid crystal composition having an optically isotropic liquid crystal phase of the present invention contains an achiral component T and a chiral agent, and the achiral component T contains a compound represented by the formula (1) as component A.
  • the achiral component T is a composition containing only component A, a composition containing component A and component B represented by the formula (2), component A and the present specification. It is a composition containing the other component which does not show the component name in particular, or a composition containing the component A and the component B and the other component which does not show the component name in particular in this specification.
  • the liquid crystal composition of the present invention contains at least one compound represented by the formula (1) of the present invention as the achiral component T in a proportion of 0.1 to 100% by weight, and exhibits excellent characteristics. Therefore, it is preferable.
  • R 1 is hydrogen or alkyl having 1 to 20 carbon atoms, and any —CH 2 — in the alkyl is —O—, —S—, —COO—, —OCO—, — CH ⁇ CH—, —CF ⁇ CF— or —C ⁇ C— may be substituted, and any —CH 2 — in the alkyl and in the alkyl is —O—, —S—, —COO—, Any hydrogen in the group replaced by —OCO—, —CH ⁇ CH—, —CF ⁇ CF— or —C ⁇ C— may be replaced by halogen or alkyl of 1 to 3 carbons; 1 , Z 2 and Z 3 are independently a single bond, —COO— or —CF 2 O—, but at least one is —CF 2 O—; L 1 , L 2 , L 3 , L 4, and L 5 are independently hydrogen or fluorine; X 1 is hydrogen, halo E
  • a straight chain is preferable to a branch.
  • the preferred configuration of —CH ⁇ CH— in alkenyl depends on the position of the double bond. —CH ⁇ CHCH 3 , —CH ⁇ CHC 2 H 5 , —CH ⁇ CHC 3 H 7 , —CH ⁇ CHC 4 H 9 , —C 2 H 4 CH ⁇ CHCH 3 , and —C 2 H 4 CH ⁇ CHC 2
  • the trans configuration is preferable.
  • -CH 2 CH CHCH 3
  • An alkenyl compound having a preferred configuration has a high maximum temperature or a wide temperature range of the liquid crystal phase.
  • Mol. Cryst. Liq. Cryst., 1985, 131, 109 and Mol. Cryst. Liq. Cryst., 1985, 131, 327 have detailed descriptions.
  • the alkyl may be linear or branched, and specific examples of alkyl include —CH 3 , —C 2 H 5 , —C 3 H 7 , —C 4 H 9 , —C 5 H 11 , —C 6. H 13 , —C 7 H 15 , —C 8 H 17, —C 9 H 19 , —C 10 H 21 , —C 11 H 23 , —C 12 H 25 , —C 13 H 27 , —C 14 H 29 , And -C 15 H 31 .
  • Alkoxy may be linear or branched, and specific examples of alkoxy include —OCH 3 , —OC 2 H 5 , —OC 3 H 7 , —OC 4 H 9 , —OC 5 H 11 , —OC 6. H 13 and -OC 7 H 15 , -OC 8 H 17, -OC 9 H 19 , -OC 10 H 21 , -OC 11 H 23 , -OC 12 H 25 , -OC 13 H 27 , and -OC 14 H 29 .
  • the alkoxyalkyl may be linear or branched, and specific examples of alkoxyalkyl include —CH 2 OCH 3 , —CH 2 OC 2 H 5 , —CH 2 OC 3 H 7 , — (CH 2 ) 2. —OCH 3 , — (CH 2 ) 2 —OC 2 H 5 , — (CH 2 ) 2 —OC 3 H 7 , — (CH 2 ) 3 —OCH 3 , — (CH 2 ) 4 —OCH 3 , and — (CH 2 ) 5 —OCH 3 .
  • the alkenyl may be linear or branched, and specific examples of alkenyl include —CH ⁇ CH 2 , —CH ⁇ CHCH 3 , —CH 2 CH ⁇ CH 2 , —CH ⁇ CHC 2 H 5 , —CH. 2 CH ⁇ CHCH 3 , — (CH 2 ) 2 —CH ⁇ CH 2 , —CH ⁇ CHC 3 H 7 , —CH 2 CH ⁇ CHC 2 H 5 , — (CH 2 ) 2 —CH ⁇ CHCH 3 , and — (CH 2 ) 3 —CH ⁇ CH 2 .
  • Alkenyloxy may be linear or branched, and specific examples of alkenyloxy are —OCH 2 CH ⁇ CH 2 , —OCH 2 CH ⁇ CHCH 3 , and —OCH 2 CH ⁇ CHC 2 H 5 . .
  • Alkynyl may be linear or branched. Specific examples of alkynyl include —C ⁇ CH, —C ⁇ CCH 3 , —CH 2 C ⁇ CH, —C ⁇ CC 2 H 5 , —CH 2 C ⁇ CCH. 3 , — (CH 2 ) 2 —C ⁇ CH, —C ⁇ CC 3 H 7 , —CH 2 C ⁇ CC 2 H 5 , — (CH 2 ) 2 —C ⁇ CCH 3 , and —C ⁇ C (CH 2 ) It is 5 .
  • R 1 is the structure represented by the formula (CHN-1) ⁇ (CHN -19) are preferred.
  • R 1a is hydrogen or alkyl having 1 to 20 carbons. More preferred R 1 is a structure represented by the formulas (CHN-1) to (CHN-4) or (CHN-6) to (CHN-7).
  • Z 1 , Z 2 and Z 3 are each independently a single bond, —COO— or —CF 2 O—, but at least one is —CF 2 O—.
  • Z 1 , Z 2 , and Z 3 are a single bond and —CF 2 O—.
  • L 1 , L 2 , L 3 , L 4 , and L 5 are independently hydrogen or fluorine.
  • L 2 and L 4 are preferably fluorine, and L 2 , L 4 and L 5 are more preferably fluorine.
  • X 1 is hydrogen, halogen, —SF 5 , or alkyl having 1 to 10 carbons, and in this alkyl, arbitrary —CH 2 — is —O—, —S—, —CH ⁇ CH —, Or —C ⁇ C— may be replaced, and any —CH 2 — in alkyl and in alkyl may be —O—, —S—, —CH ⁇ CH—, or —C ⁇ C—. Any hydrogen in the group replaced with may be replaced with fluorine.
  • alkyl in which any hydrogen is replaced by halogen include —CH 2 F, —CHF 2 , —CF 3 , — (CH 2 ) 2 —F, —CF 2 CH 2 F, —CF 2 CHF 2 , —CH 2 CF 3 , —CF 2 CF 3 , — (CH 2 ) 3 —F, — (CF 2 ) 3 —F, —CF 2 CHFCF 3 , —CHFCF 2 CF 3 , — (CH 2 ) 4 -F,-(CF 2 ) 4 -F,-(CH 2 ) 5 -F, and-(CF 2 ) 5 -F.
  • alkoxy in which any hydrogen is replaced by halogen include —OCH 2 F, —OCHF 2 , —OCF 3 , —O— (CH 2 ) 2 —F, —OCF 2 CH 2 F, —OCF 2 CHF 2 , —OCH 2 CF 3 , —O— (CH 2 ) 3 —F, —O— (CF 2 ) 3 —F, —OCF 2 CHFCF 3 , —OCHFCF 2 CF 3 , —O (CH 2 ) 4- F, —O— (CF 2 ) 4 —F, —O— (CH 2 ) 5 —F, and —O— (CF 2 ) 5 —F.
  • X 1 are hydrogen, fluorine, chlorine, —C ⁇ N, —N ⁇ C ⁇ S, —SF 5 , —CH 3 , —C 2 H 5 , —C 3 H 7 , —C 4. H 9 , —C 5 H 11 , —C 6 H 13 , —C 7 H 15 , —C 8 H 17, —C 9 H 19 , —C 10 H 21 , —CH 2 F, —CHF 2 , —CF 3 , — (CH 2 ) 2 —F, —CF 2 CH 2 F, —CF 2 CHF 2 , —CH 2 CF 3 , —CF 2 CF 3 , — (CH 2 ) 3 —F, — (CF 2 ) 3 -F, — (CF 2 ) 3 -F, -CF 2 CHFCF 3 , -CHFCF 2 CF 3 ,-(CH 2 ) 4 -F,-(CH 2 ) 5 -F,
  • Preferred examples of X 1 are fluorine, chlorine, —CF 3 , —CHF 2 , —OCF 3 , and —OCHF 2 .
  • the most preferred examples of X 1 are fluorine, chlorine, —CF 3 and —OCF 3 .
  • R 1 is a structure represented by any one of formulas (CHN-1) to (CHN-19), R 1a is hydrogen or alkyl having 1 to 20 carbons; 1, L 2, L 3, L 4, and L 5 are independently hydrogen or fluorine,; X 1 is fluorine, chlorine ,, - CF 3, -CHF 2, -OCF 3, -OCHF 2, —C ⁇ C—CF 3 , —CH ⁇ CHCF 3 , —OCF 2 CFHCF 3 .
  • Compound (1) is a compound having four benzene rings and at least one —CF 2 O— linking group.
  • This compound is extremely physically and chemically stable under the conditions in which the device is normally used, and has good compatibility with other liquid crystal compounds.
  • a composition containing this compound is stable under conditions in which the device is normally used. Therefore, the temperature range of the optically isotropic liquid crystal phase in the composition can be expanded, and the composition can be used as a display element in a wide temperature range. Furthermore, since this compound has a large dielectric anisotropy and refractive index anisotropy, it is useful as a component for lowering the driving voltage of a composition driven with an optically isotropic liquid crystal phase.
  • the left terminal group R 1 of the compound (1) By appropriately selecting the left terminal group R 1 of the compound (1), the groups on the benzene ring (L 1 to L 5 and X 1 ), or the linking groups Z 1 to Z 3 , the clearing point and the anisotropic refractive index are obtained. It is possible to arbitrarily adjust physical properties such as property and dielectric anisotropy. The effect of the type of the left terminal group R 1 , the groups on the benzene ring (L 1 to L 5 and X 1 ), or the linking groups Z 1 to Z 3 on the physical properties of the compound (1) will be described below.
  • R 1 When R 1 is linear, the temperature range of the liquid crystal phase is wide and the viscosity is small. When R 1 is branched, compatibility with other liquid crystal compounds is good. When R 1 is alkenyl, the preferred configuration depends on the position of the double bond. An alkenyl compound having a preferred configuration has a high maximum temperature or a wide temperature range of the liquid crystal phase.
  • the bonding groups Z 1 , Z 2 and Z 3 are a single bond or —CF 2 O—, the viscosity is small.
  • the bonding group is Z 1 , Z 2 and Z 3 are —COO— or —CF 2 O—, the dielectric anisotropy is large.
  • Z 1 , Z 2, and Z 3 are a single bond and —CF 2 O—, they are chemically relatively stable and are hardly deteriorated.
  • X 1 is fluorine, chlorine, —SF 5 , —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 or —OCH 2 F
  • the dielectric anisotropy is large.
  • X 1 is fluorine, —OCF 3 , or —CF 3 , it is chemically stable.
  • a compound having desired physical properties can be obtained by appropriately selecting the type of terminal group, bonding group, and the like.
  • Preferred examples of the compound (1) are the formulas (1-1) to (1-3). More preferred examples include formulas (1-2A) to (1-2H) and (1-3A) to (1-3C). More preferred examples include formulas (1-2A) to (1-2D), (1-3A), and (1-3B). The most preferred examples include formulas (1-2A) and (1-2C).
  • R 1 is one chain selected from the formulas (CHN-1), (CHN-4), (CHN-7), (CHN-8) and (CHN-11)),
  • X 1 is fluorine, chlorine, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 , —OCF 2 CFHCF 3 or —CH ⁇ CHCF 3 ;
  • MSG 1 or MSG 2 is a monovalent organic group having at least one ring.
  • a plurality of MSG 1 (or MSG 2 ) used in the scheme may be the same or different.
  • Compounds (1A) to (1J) correspond to compound (1).
  • the second aspect of the present invention is an achiral component T obtained by adding a component selected from components B, C, D and E shown below to component A consisting of the compound represented by formula (1). It is a liquid crystal composition containing a chiral agent, and has a driving voltage, a liquid crystal phase temperature range, a refractive index anisotropy value, a dielectric anisotropy value, a viscosity and the like as compared with a composition in which an achiral component T is only component A. It can be adjusted freely.
  • component B As a component to be added to component A, at least one component B selected from the group consisting of at least one compound selected from the group of the above formula (2) and the above formulas (3), (4) and (5) is selected.
  • Component C consisting of a kind of compound
  • Component D consisting of at least one compound selected from the group consisting of the above formula (6), or the above formulas (7), (8), (9), (10)
  • What mixed the component E which consists of an at least 1 sort (s) of compound chosen from the group which consists of (11) is preferable.
  • component F consisting of at least one compound selected from the group consisting of the formulas (12), (13) and (14
  • threshold voltage liquid crystal phase temperature range
  • refractive index anisotropy value In addition, the dielectric anisotropy value and viscosity can be adjusted.
  • the component added to component A is selected from the component G consisting of at least one compound selected from the group consisting of the formulas (15), (16) and (17), or the group consisting of the formula (18).
  • Component H consisting of at least one compound selected is preferred. Components G and H are particularly useful for increasing the refractive index anisotropy value and the dielectric anisotropy value.
  • an analog composed of an isotope element of each element can be used because there is no great difference in physical properties.
  • formulas (3-1) to (3-16) are preferred, and as a preferred example of the compound represented by formula (4), formula (4-1).
  • formulas (5-1) to (5-52) are preferred, and as a preferred example of the compound represented by formula (4), formula (4-1).
  • formulas (5-1) to (5-52) include formulas (5-1) to (5-52), respectively.
  • component C have a positive dielectric anisotropy value and are extremely excellent in thermal stability and chemical stability. It is used when preparing a liquid crystal composition.
  • the content of component C in the liquid crystal composition of the present invention is suitably in the range of 1 to 99% by weight, preferably 1 to 60% by weight, more preferably 1 to 35% by weight, based on the total weight of the liquid crystal composition. It is. Further, the viscosity can be adjusted by further containing a compound (component F) represented by the formulas (12) to (14).
  • component D include formulas (6-1) to (6-62).
  • the compound represented by the formula (6) that is, the component D, has a positive dielectric anisotropy value and a very large value.
  • the composition driving voltage can be reduced.
  • the viscosity, the refractive index anisotropy value, and the liquid crystal phase temperature range can be expanded.
  • the content of component D is preferably in the range of 0.1 to 99.9% by weight, more preferably in the range of 1 to 97% by weight, and still more preferably in the range of 1 to 30% by weight with respect to the total amount of the composition. .
  • the threshold voltage, the liquid crystal phase temperature range, the refractive index anisotropy value, the dielectric anisotropy value, the viscosity, and the like can be adjusted by mixing the components described later.
  • Component E comprising at least one compound selected from the group consisting of formulas (7) to (11) is a preferred component when preparing the liquid crystal composition of the present invention having a negative dielectric anisotropy.
  • Preferable examples of the compounds represented by formulas (7) to (11) include formulas (7-1) to (7-5), formulas (8-1) to (8-9), Examples thereof include formulas (9-1) to (9-3) and formulas (11-1) to (11-11).
  • These compounds of component E are mainly used for liquid crystal compositions having a negative dielectric anisotropy value. Since the compound represented by the formula (7) among the components E is a bicyclic compound, it has the effect of mainly adjusting the threshold voltage, adjusting the viscosity, or adjusting the refractive index anisotropy value. Further, since the compounds represented by the formulas (8) and (9) are tricyclic compounds, the clearing point is increased, the temperature range of the optically isotropic liquid crystal phase is increased, and the refractive index anisotropy is increased. Effects such as increasing the value can be obtained. Since the compounds represented by the formulas (10) and (11) have a negative dielectric anisotropy value, they are mainly effective in adjusting the driving voltage.
  • the content of component E is preferably 40% by weight or more, more preferably 50 to 95% by weight, based on the total amount of the composition. Range. Further, by mixing the component E, it is possible to control the elastic constant and control the voltage transmittance curve of the composition.
  • the content is preferably 30% by weight or less based on the total amount of the composition.
  • Preferable examples of the compound represented by formulas (12), (13) and (14) include formulas (12-1) to (12-11) and formulas (13-1) to (13-18), respectively. ) And formulas (14-1) to (14-6).
  • R 7 and R 8 are as defined R 7, R 8 in the formula (12) to (14)
  • the compounds represented by the formulas (12) to (14) are compounds having a small absolute value of dielectric anisotropy and close to neutrality.
  • the compound represented by the formula (12) mainly has an effect of adjusting the viscosity or the refractive index anisotropy value, and the compounds represented by the formulas (13) and (14) are optical elements such as increasing the clearing point.
  • the content of component F is preferably 60% by weight or less, more preferably 40% by weight or less, based on the total amount of the composition.
  • a third aspect of the present invention is a liquid crystal composition obtained by adding a component selected from components G and H shown below to component A.
  • component G consisting of at least one compound selected from the group consisting of the above formulas (15), (16), (17) and (18), or a group consisting of the above formula (19) What mixed the component H which consists of at least 1 sort (s) of compound chosen from these is preferable.
  • each component of the liquid crystal composition used in the present invention is not greatly different in physical properties even if it is an analog composed of an isotope element of each element.
  • formulas (15-1) to (15-8) are preferred examples of the compound represented by formula (15), and formula (16-1) is a preferred example of the compound represented by formula (16).
  • formula (17-7) and (17-8) are effective in extending the low temperature side temperature range.
  • R 9, X 5 has the same meaning as R 9, X 5 in the formula (15) ⁇ (18), (F) denotes hydrogen or fluorine, (F, Cl) is hydrogen or fluorine or Represents chlorine.)
  • the compounds represented by the formulas (15) to (18), that is, the component G have a positive dielectric anisotropy value and are very large, and have excellent thermal stability and chemical stability. It is suitable for preparing a liquid crystal composition for active driving such as TFT driving.
  • the content of component G in the liquid crystal composition of the present invention is suitably in the range of 1 to 99% by weight, preferably 10 to 97% by weight, more preferably 20 to 95% by weight, based on the total weight of the liquid crystal composition. It is. Further, the viscosity can be adjusted by further containing a compound represented by formulas (12) to (14) (component F).
  • Preferred examples of the compound represented by the formula (19), that is, the component H include formulas (19-1) to (19-37).
  • R 10 and X 6 have the same meanings as R 10 and X 6 in formula (19), (F) represents hydrogen or fluorine, and (F, Cl) represents hydrogen, fluorine or chlorine. Represents.)
  • These compounds represented by the formula (19), that is, the component H, are mainly used when the device is driven at a low voltage because the dielectric anisotropy value is positive and the value is very large.
  • the driving voltage of the composition can be reduced.
  • the viscosity, the refractive index anisotropy value, and the liquid crystal phase temperature range can be expanded. It can also be used to improve steepness.
  • the content of component H is preferably in the range of 0.1 to 99.9% by weight, more preferably in the range of 1 to 97% by weight, and still more preferably in the range of 1 to 45% by weight with respect to the total amount of the composition. .
  • the liquid crystal composition of the present invention is generally prepared by a known method, for example, a method of dissolving necessary components at a high temperature.
  • a fourth aspect of the present invention is a composition comprising a compound represented by formula (1) and a chiral agent, and is optically equivalent. It is a liquid crystal composition that can be used for an optical element driven in a isotropic liquid crystal phase.
  • the liquid crystal composition is a composition that exhibits an optically isotropic liquid crystal phase.
  • the compound represented by the formula (1) has a low clearing point for a tetracyclic compound and has a large dielectric anisotropy and a large refractive index anisotropy.
  • the content of 0.1 to 100% by weight with respect to the total weight of the achiral component T that has not been formed is preferable in order to develop excellent characteristics.
  • the content is more preferably 5 to 100% by weight, more preferably 30 to 100% by weight, and still more preferably 70 to 100% by weight.
  • the compound represented by the formula (1-2) is excellent in compatibility with other liquid crystal compositions, the content thereof may be 5 to 100% by weight with respect to the total weight of the achiral component T, preferably Is 20 to 100% by weight, more preferably 20 to 80% by weight.
  • the chiral agent is preferably contained in an amount of 1 to 40% by weight, more preferably 3 to 25% by weight, and most preferably 5 to 15% by weight based on the total weight of the liquid crystal composition of the present invention.
  • a liquid crystal composition containing a chiral agent in these ranges is preferable because it tends to have an optically isotropic liquid crystal phase.
  • the chiral agent contained in the liquid crystal composition may be one type or two or more types.
  • the chiral agent contained in the optically isotropic liquid crystal composition is not particularly limited as long as it is an optically active compound that causes twisting in the liquid crystal composition when added to the achiral component T. .
  • a compound having a large twisting power is preferable.
  • a compound having a large torsional force can reduce the amount of addition necessary for obtaining a desired pitch, and therefore, an increase in driving voltage can be suppressed, which is practically advantageous.
  • compounds represented by the following formulas (K1) to (K5) are preferable.
  • Any hydrogen in the alkyl may be replaced by halogen, and the terminal —CH 3 is May be replaced by;
  • A is independently an aromatic or non-aromatic 3- to 8-membered ring or a condensed ring having 9 or more carbon atoms, and any hydrogen in these rings is halogen, alkyl having 1 to 3 carbon atoms Or may be replaced by haloalkyl, the ring —CH 2 — may be replaced by —O—, —S— or —NH—, —CH ⁇ may be replaced by —N ⁇ ;
  • Any hydrogen in these rings may be replaced by halogen, alkyl of 1 to 3 carbon atoms or haloalkyl, —CH 2 — may be replaced by
  • X is a single bond, —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, or —CH 2 CH 2 —;
  • mK is an integer of 1 to 4.
  • R K , A, Z, and mK they may be the same or different.
  • the chiral agent added to the liquid crystal composition includes the formula (K2-1) to the formula (K2-8) included in the formula (K2) and the formula (K4-1) included in the formula (K4).
  • Formula (K4-6) and Formula (K5-1) to Formula (K5-3) included in Formula (K5) are preferable.
  • R K is independently alkyl having 3 to 10 carbon atoms, and —CH 2 — adjacent to the ring in this alkyl may be replaced by —O—, and the ring in alkyl or in alkyl is Any —CH 2 — in the group in which —CH 2 — adjacent to is replaced by —O— may be replaced by —CH ⁇ CH—.
  • the optically isotropic liquid crystal phase liquid crystal composition is optically isotropic.
  • the liquid crystal molecular alignment is isotropic macroscopically, it is optically isotropic. Microscopically, it means that liquid crystal order exists.
  • pitch based on microscopic order of liquid crystal composition (hereinafter, sometimes referred to as pitch)” is preferably 700 nm or less, more preferably 500 nm or less, and 350 nm or less. Is most preferred.
  • non-liquid crystal isotropic phase is a generally defined isotropic phase, that is, a disordered phase, and even if a region where the local order parameter is not zero is generated, the cause is due to fluctuations.
  • Isotropic phase For example, an isotropic phase appearing on the high temperature side of the nematic phase corresponds to a non-liquid crystal isotropic phase in this specification.
  • the same definition shall apply to the chiral liquid crystal in this specification.
  • the “optically isotropic liquid crystal phase” refers to a phase that expresses an optically isotropic liquid crystal phase instead of fluctuations, for example, a phase that expresses a platelet structure (in a narrow sense). Blue phase) is an example.
  • optically isotropic liquid crystal composition of the present invention although it is an optically isotropic liquid crystal phase, a platelet structure typical of a blue phase may not be observed under a polarizing microscope. Therefore, in this specification, a phase that develops a platelet structure is referred to as a blue phase, and an optically isotropic liquid crystal phase including the blue phase is referred to as an optically isotropic liquid crystal phase. That is, the blue phase is included in the optically isotropic liquid crystal phase.
  • blue phases are classified into three types (blue phase I, blue phase II, blue phase III), and these three types of blue phases are all optically active and isotropic.
  • the blue phase I or blue phase II two or more types of diffracted light caused by Bragg reflection from different lattice planes are observed.
  • the blue phase is generally observed between the non-liquid crystal isotropic phase and the chiral nematic phase.
  • the state in which the optically isotropic liquid crystal phase does not show two or more colors of diffracted light means that the platelet structure observed in the blue phase I and the blue phase II is not observed and is generally monochromatic. To do.
  • an optically isotropic liquid crystal phase that does not show diffracted light of two or more colors it is not necessary until the brightness of the color is uniform in the plane.
  • An optically isotropic liquid crystal phase that does not show diffracted light of two or more colors has an advantage that the reflected light intensity due to Bragg reflection can be suppressed or shifted to the lower wavelength side.
  • the liquid crystal material that reflects visible light may have a problem of color when used as a display element.
  • the reflection wavelength is shifted by a low wavelength. Therefore, the reflection of visible light can be eliminated at a pitch longer than the narrowly defined blue phase (phase that expresses the platelet structure).
  • the optically isotropic liquid crystal composition of the present invention can be obtained by adding a chiral agent to a composition having a nematic phase. At this time, the chiral agent is preferably added at a concentration such that the pitch is 700 nm or less. In addition, the composition which has a nematic phase contains the compound represented by Formula (1) and another component as needed.
  • the optically isotropic liquid crystal composition of the present invention can also be obtained by adding a chiral agent to a composition having a chiral nematic phase and not having an optically isotropic liquid crystal phase. .
  • the composition which has a chiral nematic phase and does not have an optically isotropic liquid crystal contains the compound represented by Formula (1), an optically active compound, and other components as needed.
  • the optically active compound is preferably added at a concentration such that the pitch is 700 nm or more so as not to develop an optically isotropic liquid crystal phase.
  • the optically active compound to be added is a compound (K1) to (K5), a formula (K2-1) to (K2-8) or a formula (K5-1) The compound represented by K5-3) can be used.
  • the optically active compound to be added may be a compound that does not have a very large twisting force. Examples of such an optically active compound include a compound added to a liquid crystal composition for an element (TN mode, STN mode, etc.) driven in a nematic phase.
  • the temperature range of the optically isotropic liquid crystal composition of the present invention is such that a chiral agent is added to a liquid crystal composition having a wide coexistence temperature range of a nematic phase or a chiral nematic phase and an isotropic phase, and the optical It can be widened by developing an isotropic liquid crystal phase.
  • a liquid crystal compound having a high clearing point and a liquid crystal compound having a low clearing point are mixed to prepare a liquid crystal composition having a wide coexisting temperature range of a nematic phase and an isotropic phase over a wide temperature range, and a chiral agent is added thereto.
  • a composition that exhibits an optically isotropic liquid crystal phase in a wide temperature range can be prepared.
  • the difference between the maximum temperature and the minimum temperature at which the chiral nematic phase and the non-liquid crystal isotropic phase coexist is 3 to 150 ° C.
  • a liquid crystal composition is preferable, and a liquid crystal composition having a difference of 5 to 150 ° C. is more preferable.
  • a liquid crystal composition in which the difference between the upper limit temperature and the lower limit temperature at which the nematic phase and the non-liquid crystal isotropic phase coexist is 3 to 150 ° C. is preferable.
  • the optically isotropic liquid crystal composition of the present invention may be further added with other compounds such as a polymer substance as long as the properties of the composition are not affected.
  • the liquid crystal composition of the present invention may contain, for example, a dichroic dye and a photochromic compound in addition to the polymer substance.
  • dichroic dyes include merocyanine, styryl, azo, azomethine, azoxy, quinophthalone, anthraquinone, and tetrazine.
  • a fifth aspect of the present invention is a composite material of a liquid crystal composition and a polymer containing a compound represented by formula (1) and a chiral agent, and optically Isotropic.
  • This is an optically isotropic polymer / liquid crystal composite material that can be used in an optical element driven in an optically isotropic liquid crystal phase.
  • Such a polymer / liquid crystal composite material includes, for example, the liquid crystal composition described in the items [1] to [33] and a polymer.
  • the “polymer / liquid crystal composite material” of the present invention is not particularly limited as long as it is a composite material containing both a liquid crystal material and a polymer compound, but part or all of the polymer is dissolved in the liquid crystal material.
  • the polymer may be phase-separated from the liquid crystal material in the absence of the liquid crystal material.
  • a nematic phase means a nematic phase in a narrow sense that does not include a chiral nematic phase.
  • the optically isotropic polymer / liquid crystal composite material according to a preferred embodiment of the present invention can exhibit an optically isotropic liquid crystal phase in a wide temperature range. Further, the polymer / liquid crystal composite material according to a preferred embodiment of the present invention has an extremely fast response speed. Moreover, the polymer / liquid crystal composite material according to a preferred embodiment of the present invention can be suitably used for an optical element such as a display element based on these effects.
  • the composite material of the present invention can be produced by mixing an optically isotropic liquid crystal composition and a polymer obtained by polymerization in advance. It is preferably produced by mixing a monomer having a molecular weight, a macromonomer, an oligomer or the like (hereinafter collectively referred to as “monomer or the like”) and the liquid crystal composition CLC, and then performing a polymerization reaction in the mixture.
  • a monomer having a molecular weight, a macromonomer, an oligomer or the like hereinafter collectively referred to as “monomer or the like”
  • the liquid crystal composition CLC a mixture containing a monomer or the like and a liquid crystal composition
  • the “polymerizable monomer / liquid crystal mixture” includes a polymerization initiator, a curing agent, a catalyst, a stabilizer, a dichroic dye, or a photochromic compound, which will be described later, as necessary, as long as the effects of the present invention are not impaired. But you can.
  • the polymerizable monomer / liquid crystal mixture of the present invention may contain a polymerization initiator in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the polymerizable monomer, if necessary.
  • the polymerization temperature is preferably a temperature at which the polymer / liquid crystal composite material exhibits high transparency and isotropic properties. More preferably, the polymerization is terminated at a temperature at which the mixture of the monomer and the liquid crystal material develops an isotropic phase or a blue phase, and at the isotropic phase or the optically isotropic liquid crystal phase. That is, after polymerization, the polymer / liquid crystal composite material is preferably set to a temperature that does not substantially scatter light on the longer wavelength side than visible light and develops an optically isotropic state.
  • the polymer raw material constituting the composite material of the present invention for example, a low molecular weight monomer, macromonomer, and oligomer can be used.
  • the high molecular weight raw material monomer is a low molecular weight monomer, macromonomer.
  • the obtained polymer has a three-dimensional cross-linked structure, and therefore, it is preferable to use a polyfunctional monomer having two or more polymerizable functional groups as a raw material monomer for the polymer.
  • the polymerizable functional group is not particularly limited, and an acrylic group, a methacryl group, a glycidyl group, an epoxy group, an oxetanyl group, a vinyl group, and the like can be raised, but an acrylic group and a methacryl group are preferable from the viewpoint of polymerization rate.
  • a monomer having two or more polymerizable functional groups in the polymer raw material monomer is contained in an amount of 10% by weight or more, high transparency and isotropy are easily exhibited in the composite material of the present invention. This is preferable.
  • the polymer preferably has a mesogen moiety, and a raw material monomer having a mesogen moiety can be used as a part or all of the raw material monomer.
  • the monofunctional or bifunctional monomer having a mesogen moiety is not particularly limited in terms of structure.
  • the following formula (M1) or (M2) The compound represented by these can be mentioned.
  • each R a is independently hydrogen, halogen, —C ⁇ N, —N ⁇ C ⁇ O, —N ⁇ C ⁇ S, or alkyl having 1 to 20 carbons.
  • any —CH 2 — is replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF—, or —C ⁇ C—.
  • any —CH 2 — in the alkyl and in the alkyl may be —O—, —S—, —COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF— or —C ⁇ .
  • Any hydrogen in the group replaced with C- may be replaced with halogen or -C ⁇ N.
  • R b is each independently a polymerizable group of formula (M3-1) to formula (M3-7).
  • R a is hydrogen, halogen, —C ⁇ N, —CF 3 , —CF 2 H, —CFH 2 , —OCF 3 , —OCF 2 H, alkyl having 1 to 20 carbons, or alkyl having 1 to 19 carbons. Alkoxy, alkenyl having 2 to 21 carbons, and alkynyl having 2 to 21 carbons. Particularly preferred R a is —C ⁇ N, alkyl having 1 to 20 carbons and alkoxy having 1 to 19 carbons.
  • each R b is independently a polymerizable group of the formulas (M3-1) to (M3-7).
  • R d in formulas (M3-1) to (M3-7) is each independently hydrogen, halogen, or alkyl having 1 to 5 carbon atoms, and in these alkyls, arbitrary hydrogen is replaced by halogen. May be.
  • Preferred R d is hydrogen, halogen and methyl.
  • Particularly preferred R d is hydrogen, fluorine and methyl.
  • the formula (M3-2), the formula (M3-3), the formula (M3-4), and the formula (M3-7) are preferably polymerized by radical polymerization.
  • the formulas (M3-1), (M3-5), and (M3-6) are preferably polymerized by cationic polymerization.
  • a polymerization initiator can be used for the purpose of accelerating the generation of active species. For example, light or heat can be used to generate the active species.
  • a M is each independently an aromatic or non-aromatic 5-membered ring, 6-membered ring, or condensed ring having 9 or more carbon atoms.
  • CH 2 — may be —O—, —S—, —NH—, or —NCH 3 —, and —CH ⁇ in the ring may be replaced by —N ⁇ , the hydrogen atom on the ring is halogen, and carbon number It may be replaced with 1 to 5 alkyls or alkyl halides.
  • a M is 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, naphthalene-2,6-diyl, tetrahydronaphthalene-2,6-diyl, fluorene -2, 7-diyl or bicyclo [2.2.2] octane-1,4-diyl, and in these rings, any —CH 2 — may be replaced by —O—, and any —CH ⁇ is Any hydrogen in these rings and in any of these rings in which any —CH ⁇ is replaced by —N ⁇ may be halogen, alkyl having 1 to 5 carbons or 1 carbon. May be replaced by ⁇ 5 alkyl halides.
  • a M 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,3-difluoro-1,4 -Phenylene, 2,5-difluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene, 2-methyl-1,4-phenylene, 2-trifluoromethyl-1,4-phenylene, 2 , 3-bis (trifluoromethyl) -1,4-phenylene, naphthalene-2,6-diyl, tetrahydronaphthalene-2,6-diyl, fluorene-2,7-diyl, 9-methylfluorene-2,7- Diyl, 1,3-dioxane-2,5-diyl, pyridine-2,5-diyl, and pyrimidine-2,5-diyl.
  • 1,4-cyclohexylene and 1,3-dioxane-2,5-diyl is preferably trans rather than cis. Since 2-fluoro-1,4-phenylene is structurally identical to 3-fluoro-1,4-phenylene, the latter was not exemplified. This rule also applies to the relationship between 2,5-difluoro-1,4-phenylene and 3,6-difluoro-1,4-phenylene.
  • each Y is independently a single bond or alkylene having 1 to 20 carbon atoms, and in these alkylenes, any —CH 2 — is —O—, —S—, — It may be replaced by CH ⁇ CH—, —C ⁇ C—, —COO—, or —OCO—.
  • Preferred Y is a single bond, — (CH 2 ) m2 —, —O (CH 2 ) m2 —, and — (CH 2 ) m2 O— (wherein r is an integer of 1 to 20) .
  • Y is a single bond, — (CH 2 ) m2 —, —O (CH 2 ) m2 —, and — (CH 2 ) m2 O— (wherein m2 is an integer of 1 to 10). is there.
  • —Y—R a and —Y—R b are in their groups —O—O—, —O—S—, —S—O—, or —S—S. It is preferable not to have-.
  • Z M each independently represents a single bond, — (CH 2 ) m3 —, —O (CH 2 ) m3 —, — (CH 2 ) m3 O—, —O ( CH 2 ) m 3 O—, —CH ⁇ CH—, —C ⁇ C—, —COO—, —OCO—, — (CF 2 ) 2 —, — (CH 2 ) 2 —COO—, —OCO— (CH 2 ) 2 —, —CH ⁇ CH—COO—, —OCO—CH ⁇ CH—, —C ⁇ C—COO—, —OCO—C ⁇ C—, —CH ⁇ CH— (CH 2 ) 2 —, — (CH 2 ) 2 —CH ⁇ CH—, —CF ⁇ CF—, —C ⁇ C—CH ⁇ CH—, —CH ⁇ CH—C ⁇ C—, —OCF 2 — (CH 2 ) 2 —,
  • Preferred Z M is a single bond, — (CH 2 ) m3 —, —O (CH 2 ) m3 —, — (CH 2 ) m3 O—, —CH ⁇ CH—, —C ⁇ C—, —COO—, — OCO—, — (CH 2 ) 2 —COO—, —OCO— (CH 2 ) 2 —, —CH ⁇ CH—COO—, —OCO—CH ⁇ CH—, —OCF 2 —, and —CF 2 O— It is.
  • m1 is an integer of 1 to 6.
  • Preferred m1 is an integer of 1 to 3.
  • m1 is 1, it is a bicyclic compound having two rings such as a 6-membered ring.
  • m1 is 2 or 3, they are tricyclic and tetracyclic compounds, respectively.
  • two A M may be may be the same or different.
  • three A M or two Z M ) may be the same or different.
  • m1 is 3-6.
  • the compound (M1) represented by the formula (M1) and the compound (M2) represented by the formula (M2) contain isotopes such as 2 H (deuterium) and 13 C in an amount larger than the natural abundance. However, since it has the same characteristics, it can be preferably used.
  • Further preferred examples of the compound (M1) and the compound (M2) include compounds (M1-1) to (M1-1) to (M1-41) and (M2-1) to (M2-27) (M1-41) and compounds (M2-1) to (M2-27).
  • the meanings of R a , R b , R d , Z M , A M , Y and p are the same as those in formula (M1) and formula (M2) described in the embodiments of the present invention.
  • the partial structure (a1) represents 1,4-phenylene in which arbitrary hydrogen is replaced by fluorine.
  • the partial structure (a2) represents 1,4-phenylene in which arbitrary hydrogen may be replaced by fluorine.
  • the partial structure (a3) represents 1,4-phenylene in which arbitrary hydrogen may be replaced by either fluorine or methyl.
  • the partial structure (a4) represents fluorene in which the hydrogen at the 9-position may be replaced with methyl.
  • a monomer having no mesogen moiety and a polymerizable compound other than the monomers (M1) and (M2) having a mesogen moiety can be used as necessary.
  • a monomer having a mesogenic moiety and having three or more polymerizable functional groups may be used.
  • known compounds can be suitably used. Examples thereof include (M4-1) to (M4-3), and more specific examples include: Examples thereof include compounds described in JP 2000-327632 A, JP 2004-182949 A, and JP 2004-59777 A.
  • R b , Za, Y, and (F) have the same meaning as described above.
  • monomers having a polymerizable functional group not having a mesogen moiety for example, a linear or branched acrylate having 1 to 30 carbon atoms C 1-30 linear or branched diacrylates
  • monomers having three or more polymerizable functional groups include glycerol propoxylate (1PO / OH) triacrylate, pentaerythritol propoxylate triacrylate, penta Erythritol triacrylate, trimethylolpropane ethoxylate triacrylate, trimethylolpropane propoxylate triacrylate, trimethylolpropane triacrylate, di (trimethylolpropane) tetraacrylate, pentaerythritol Examples thereof include, but are not limited to, tetraacrylate, di (pentaerythritol) pentaacrylate, di (pentaerythritol)
  • the polymerization reaction in the production of the polymer constituting the composite material of the present invention is not particularly limited, and for example, photoradical polymerization, thermal radical polymerization, photocationic polymerization and the like are performed.
  • photo radical polymerization initiator examples include DAROCUR (registered trademark) 1173 and 4265 (both trade names, Ciba Specialty Chemicals), Irgacure (IRGACURE, registered trademark). 184, 369, 500, 651, 784, 819, 907, 1300, 1700, 1800, 1850, and 2959 (all trade names, Ciba Specialty Chemicals Co., Ltd.).
  • thermal radical polymerization examples include benzoyl peroxide, diisopropyl peroxydicarbonate, t-butylperoxy-2-ethylhexanoate, t-butylperoxypivalate , T-butylperoxydiisobutyrate, lauroyl peroxide, dimethyl 2,2′-azobisisobutyrate (MA IB), di-t-butyl peroxide (DTBPO), azobisisobutyronitrile (AIBN), azobiscyclohexanecarbonitrile (ACN) and the like.
  • MA IB dimethyl 2,2′-azobisisobutyrate
  • DTBPO di-t-butyl peroxide
  • AIBN azobisisobutyronitrile
  • ACN azobiscyclohexanecarbonitrile
  • photocationic polymerization initiator examples include diaryliodonium salts (hereinafter referred to as “DAS”), triarylsulfonium salts (hereinafter referred to as “TAS”), and the like.
  • DAS diaryliodonium salts
  • TAS triarylsulfonium salts
  • DAS includes diphenyliodonium tetrafluoroborate, diphenyliodonium hexafluorophosphonate, diphenyliodonium hexafluoroarsenate, diphenyliodonium trifluoromethanesulfonate, diphenyliodonium trifluoroacetate, diphenyliodonium-p-toluenesulfonate, diphenyliodoniumtetra (pentafluorophenyl) ) Borate, 4-methoxyphenyl phenyl iodonium tetrafluoroborate, 4-methoxyphenyl phenyl iodonium hexafluorophosphonate, 4-methoxyphenyl phenyl iodonium hexafluoroarsenate, 4-methoxyphenyl phenyl iodonium trifluoromethanesulfonate, 4-methoxyphen
  • Sensitivity can be increased by adding a photosensitizer such as thioxanthone, phenothiazine, chlorothioxanthone, xanthone, anthracene, diphenylanthracene, rubrene to DAS.
  • a photosensitizer such as thioxanthone, phenothiazine, chlorothioxanthone, xanthone, anthracene, diphenylanthracene, rubrene to DAS.
  • TAS includes triphenylsulfonium tetrafluoroborate, triphenylsulfonium hexafluorophosphonate, triphenylsulfonium hexafluoroarsenate, triphenylsulfonium trifluoromethanesulfonate, triphenylsulfonium trifluoroacetate, triphenylsulfonium-p-toluenesulfonate, Triphenylsulfonium tetra (pentafluorophenyl) borate, 4-methoxyphenyldiphenylsulfonium tetrafluoroborate, 4-methoxyphenyldiphenylsulfonium hexafluorophosphonate, 4-methoxyphenyldiphenylsulfonium hexafluoroarsenate, 4-methoxyphenyldiphenylsulfonium trifluoromethane Sulfona
  • Examples of specific trade names of the photocationic polymerization initiator include Cyracure (registered trademark) UVI-6990, Cyracure UVI-6974, Cyracure UVI-6922 (trade names, UCC Co., Ltd.) and Adekaoptomer SP, respectively.
  • Cyracure registered trademark
  • UVI-6990 Cyracure UVI-6974
  • Cyracure UVI-6922 trade names, UCC Co., Ltd.
  • Adekaoptomer SP Adekaoptomer SP, respectively.
  • -150, SP-152, SP-170, SP-172 (trade names, ADEKA Corporation), Rhodorsil® Photoinitiator 2074 (trade name, Rhodia Japan Co., Ltd.), Irgacure (registered trademark) 250 (trade name) Ciba Specialty Chemicals Co., Ltd.), UV-9380C (trade name, GE Toshiba Silicone Co., Ltd.), and the like.
  • latent curing agents that are usually used as curing agents for epoxy resins can be used.
  • latent epoxy resin curing agent include amine curing agents, novolak resin curing agents, imidazole curing agents, and acid anhydride curing agents.
  • amine curing agents include aliphatic polyamines such as diethylenetriamine, triethylenetetraamine, tetraethylenepentamine, m-xylenediamine, trimethylhexamethylenediamine, 2-methylpentamethylenediamine, diethylaminopropylamine, and isophoronediamine.
  • 1,3-bisaminomethylcyclohexane bis (4-aminocyclohexyl) methane, norbornenediamine, 1,2-diaminocyclohexane, alicyclic polyamines such as laromine, aroma such as diaminodiphenylmethane, diaminodiphenylethane, metaphenylenediamine Group polyamines and the like.
  • novolak resin-based curing agents examples include phenol novolac resins and bisphenol novolac resins.
  • the imidazole curing agent include 2-methylimidazole, 2-ethylhexylimidazole, 2-phenylimidazole, 1-cyanoethyl-2-phenylimidazolium trimellitate, and the like.
  • acid anhydride curing agents examples include tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, methylcyclohexene tetracarboxylic dianhydride, phthalic anhydride, trimellitic anhydride Acid, pyromellitic anhydride, benzophenone tetracarboxylic dianhydride and the like can be mentioned.
  • a curing accelerator for accelerating the curing reaction between the polymerizable compound having a glycidyl group, an epoxy group, or an oxetanyl group and the curing agent may be further used.
  • the curing accelerator include tertiary amines such as benzyldimethylamine, tris (dimethylaminomethyl) phenol, dimethylcyclohexylamine, 1-cyanoethyl-2-ethyl-4-methylimidazole, 2-ethyl-4-methyl.
  • Imidazoles such as imidazole, organophosphorus compounds such as triphenylphosphine, quaternary phosphonium salts such as tetraphenylphosphonium bromide, 1,8-diazabicyclo [5.4.0] undecene-7, and organic acid salts thereof
  • examples thereof include quaternary ammonium salts such as diazabicycloalkenes, tetraethylammonium bromide and tetrabutylammonium bromide, and boron compounds such as boron trifluoride and triphenylborate.
  • These curing accelerators can be used alone or in admixture of two or more.
  • a stabilizer is preferably added in order to prevent undesired polymerization during storage.
  • All compounds known to those skilled in the art can be used as stabilizers.
  • Representative examples of stabilizers include 4-ethoxyphenol, hydroquinone, butylated hydroxytoluene (BHT) and the like.
  • the content ratio of the liquid crystal composition in the polymer / liquid crystal composite material of the present invention is possible as long as the composite material can express an optically isotropic liquid crystal phase. It is preferable that the content is as high as possible. This is because the electric birefringence value of the composite material of the present invention increases as the content of the liquid crystal composition is higher.
  • the content of the liquid crystal composition is preferably from 60 to 99% by weight, more preferably from 60 to 95% by weight, particularly from 65 to 95% by weight, based on the composite material.
  • the content of the polymer is preferably 1 to 40% by weight, more preferably 5 to 40% by weight, and particularly preferably 5 to 35% by weight with respect to the composite material.
  • the polymer / liquid crystal composite material of the present invention may contain, for example, a dichroic dye and a photochromic compound as long as the effects of the present invention are not impaired.
  • EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not restrict
  • a sixth aspect of the present invention is a liquid crystal composition or a polymer / liquid crystal composite material (hereinafter, the liquid crystal composition and polymer / liquid crystal composite material of the present invention may be collectively referred to as a liquid crystal medium). ) Including an optically isotropic liquid crystal phase. When no electric field is applied, the liquid crystal medium is optically isotropic, but when an electric field is applied, the liquid crystal medium exhibits optical anisotropy, and light modulation by the electric field becomes possible. As an example of the structure of the liquid crystal display element, as shown in FIG.
  • GC analysis GC-14B gas chromatograph manufactured by Shimadzu Corporation was used as a measuring device.
  • a capillary column CBP1-M25-025 (length: 25 m, inner diameter: 0.22 mm, film thickness: 0.25 ⁇ m) manufactured by Shimadzu Corporation; dimethylpolysiloxane; nonpolar) as the stationary liquid phase was used.
  • Helium was used as the carrier gas, and the flow rate was adjusted to 1 ml / min.
  • the temperature of the sample vaporizing chamber was set to 300 ° C., and the temperature of the detector (FID) portion was set to 300 ° C.
  • the sample was dissolved in toluene to prepare a 1% by weight solution, and 1 ⁇ l of the resulting solution was injected into the sample vaporization chamber.
  • a recorder a C-R6A type Chromatopac manufactured by Shimadzu Corporation or an equivalent thereof was used.
  • the obtained gas chromatogram shows the peak retention time and peak area value corresponding to the component compounds.
  • capillary column DB-1 (length 30 m, inner diameter 0.32 mm, film thickness 0.25 ⁇ m) manufactured by Agilent Technologies Inc.
  • HP-1 length 30 m, inner diameter 0
  • Rtx-1 from Restek Corporation (length 30 m, inner diameter 0.32 mm, film thickness 0.25 ⁇ m)
  • BP-1 from SGE International Corporation Pty. Ltd (length 30 m, inner diameter) 0.32 mm, film thickness of 0.25 ⁇ m) or the like
  • SGE International Corporation Pty. Ltd length 30 m, inner diameter 0.32 mm, film thickness of 0.25 ⁇ m
  • the peak area ratio in the gas chromatogram corresponds to the ratio of the component compounds.
  • the weight% of the component compound of the analysis sample is not completely the same as the area% of each peak of the analysis sample.
  • the correction factor is substantially 1. Therefore, the weight% of the component compound in the analysis sample substantially corresponds to the area% of each peak in the analysis sample. This is because there is no significant difference in the correction coefficients of the component liquid crystal compounds.
  • an internal standard method based on the gas chromatogram is used.
  • the liquid crystal compound component (test component) weighed in a certain amount accurately and the reference liquid crystal compound (reference material) are simultaneously measured by gas chromatography, and the area ratio between the peak of the obtained test component and the peak of the reference material Is calculated in advance.
  • the composition ratio of the liquid crystal compound in the liquid crystal composition can be determined more accurately from gas chromatography analysis.
  • Samples for Measuring Physical Property Values of Liquid Crystal Compounds There are two types of samples for measuring the physical property values of liquid crystal compounds: when the compound itself is used as a sample, and when the compound is mixed with mother liquid crystals as a sample.
  • the measurement is performed by the following method. First, 15% by weight of the obtained liquid crystal compound and 85% by weight of the mother liquid crystal are mixed to prepare a sample. Then, an extrapolated value is calculated from the measured value of the obtained sample according to the extrapolation method based on the following calculation formula. This extrapolated value is taken as the physical property value of this compound.
  • ⁇ Extrapolated value> (100 ⁇ ⁇ Measured value of sample> ⁇ ⁇ Weight% of mother liquid crystal> ⁇ ⁇ Measured value of mother liquid crystal>) / ⁇ Weight% of liquid crystal compound>
  • the ratio between the liquid crystal compound and the mother liquid crystal is this ratio, when the smectic phase or crystal is precipitated at 25 ° C., the ratio between the liquid crystal compound and the mother liquid crystal is 10% by weight: 90% by weight, 5% by weight. %: 95% by weight, 1% by weight: 99% by weight in order, and the physical properties of the sample were measured with a composition in which the smectic phase or crystals did not precipitate at 25 ° C., and extrapolated according to the above formula. This is taken as the physical property value of the liquid crystal compound.
  • mother liquid crystals A there are various types of mother liquid crystals used for measurement.
  • the composition (% by weight) of the mother liquid crystals A is as follows.
  • Phase structure and phase transition temperature Measurement was performed by the following methods (1) and (2).
  • a compound is placed on a hot plate (Mettler FP-52 type hot stage) of a melting point measuring apparatus equipped with a polarizing microscope, and a phase state and its change are observed with a polarizing microscope while heating at a rate of 3 ° C./min. , Identified the type of liquid crystal phase.
  • (2) Using a scanning calorimeter DSC-7 system or Diamond DSC system manufactured by PerkinElmer, Inc., the temperature is raised and lowered at a rate of 3 ° C / min, and the start point of the endothermic peak or exothermic peak accompanying the phase change of the sample is excluded.
  • the phase transition temperature was determined by onset.
  • the crystal is expressed as K, and when the crystal can be distinguished, it is expressed as K 1 or K 2 , respectively.
  • the smectic phase is represented as Sm
  • the nematic phase is represented as N.
  • the liquid (isotropic) was designated as I.
  • SmB or SmA When the smectic phase can be distinguished from the smectic B phase or the smectic A phase, it is expressed as SmB or SmA, respectively.
  • BP represents a blue phase or an optically isotropic liquid crystal phase.
  • the coexistence state of two phases may be expressed in the form of (N * + I) and (N * + BP).
  • (N * + I) represents a phase in which a non-liquid crystal isotropic phase and a chiral nematic phase coexist
  • (N * + BP) represents a BP phase or an optically isotropic liquid crystal phase.
  • Un represents an unidentified phase that is not optically isotropic.
  • K 50.0 N 100.0 I means that the phase transition temperature (KN) from the crystal to the nematic phase is 50.0 ° C., and the phase from the nematic phase to the liquid
  • the transition temperature (NI) is 100.0 ° C. The same applies to other notations.
  • T NI Maximum temperature of nematic phase
  • a sample (mixture of liquid crystal compound and mother liquid crystal) is placed on a hot plate (Mettler FP-52 type hot stage) of a melting point measuring apparatus equipped with a polarizing microscope. The polarizing microscope was observed while heating at a rate of ° C / min.
  • the temperature at which a part of the sample changed from a nematic phase to an isotropic liquid was defined as the upper limit temperature of the nematic phase.
  • the upper limit temperature of the nematic phase may be simply abbreviated as “upper limit temperature”.
  • Low temperature compatibility A sample in which a mother liquid crystal and a liquid crystal compound were mixed so that the liquid crystal compound was in an amount of 20% by weight, 15% by weight, 10% by weight, 5% by weight, 3% by weight, and 1% by weight. Make and place sample in glass bottle. The glass bottle was stored in a freezer at ⁇ 10 ° C. or ⁇ 20 ° C. for a certain period, and then it was observed whether crystals or smectic phases were precipitated.
  • Viscosity ( ⁇ ; measured at 20 ° C .; mPa ⁇ s): A mixture of a liquid crystal compound and a mother liquid crystal was measured using an E-type rotational viscometer.
  • Pitch P; measured at 25 ° C .; nm
  • the pitch length was measured using selective reflection (Liquid Crystal Manual 196 pages 2000, Maruzen).
  • ⁇ n> represents an average refractive index and is given by the following equation.
  • ⁇ n> ⁇ (n ⁇ 2 + n ⁇ 2) / 2 ⁇ 1/2.
  • the selective reflection wavelength was measured with a microspectrophotometer (JEOL Ltd., trade name MSV-350). The pitch was obtained by dividing the obtained reflection wavelength by the average refractive index.
  • the pitch of cholesteric liquid crystals having a reflection wavelength in the longer wavelength region than visible light is proportional to the reciprocal of the concentration of the optically active compound in the region where the optically active compound concentration is low.
  • the length was measured at several points and determined by a linear extrapolation method.
  • the “optically active compound” corresponds to the chiral agent in the present invention.
  • Synthesis of Compound (S1-6) 15.0 g of Compound (S1-5) and 150 ml of THF were added to a reactor under a nitrogen atmosphere and cooled to -74 ° C. Thereto, 27.4 ml of a 1.60 M n-butyllithium / n-hexane solution was added dropwise in the temperature range of ⁇ 74 ° C. to ⁇ 60 ° C., and the mixture was further stirred for 60 minutes. Subsequently, a solution of 12.6 g of dibromodifluoromethane in 20.0 ml of THF was dropped in a temperature range of ⁇ 75 ° C. to ⁇ 70 ° C. and stirred for 60 minutes while returning to 25 ° C.
  • the obtained reaction mixture was poured into 150 ml of ice water and mixed. Toluene (100 ml) was added to separate the organic layer from the aqueous layer and extraction was performed. The resulting organic layer was separated, washed with brine, and dried over anhydrous magnesium sulfate. The obtained solution was concentrated under reduced pressure, and the residue was purified by a fractionation operation by silica gel column chromatography using heptane as a developing solvent. The solvent was distilled off and dried to obtain 16.5 g of (S1-6).
  • the extract was washed successively with an aqueous solution, a 0.5N aqueous sodium hydroxide solution, and brine and dried over anhydrous magnesium sulfate.
  • the obtained solution was concentrated under reduced pressure, and the residue was purified by a fractionation operation by silica gel column chromatography using heptane as a developing solvent.
  • the product was further purified by recrystallization from a mixed solvent of heptane / Solmix A-11 and dried to obtain 1.7 g of (S1-8).
  • the yield of (S1-8) from (S1-5) was 20.4%.
  • phase transition temperature of the obtained compound (S1-8) was as follows. Phase transition temperature (° C.): K 92.4 N 95.4 I.
  • a liquid crystal composition B comprising 90% by weight of base liquid crystal A and 10% by weight of (S1-8) obtained in Example 1 was prepared.
  • the physical property value of the obtained liquid crystal composition B was measured, and the extrapolated value of the physical property of the liquid crystal compound (S1-8) was calculated by extrapolating the measured value.
  • a liquid crystal composition C comprising 90% by weight of base liquid crystal A and 10% by weight of (S2-1) obtained in Synthesis Example 2 was prepared.
  • the physical property value of the obtained liquid crystal composition C was measured, and the extrapolated value of the physical property of the liquid crystal compound (S2-1) was calculated by extrapolating the measured value.
  • a liquid crystal composition D comprising 95% by weight of the mother liquid crystal A of the liquid crystal compound (S3-1) and 5% by weight of (S3-1) obtained in Synthesis Example 2 was prepared.
  • the physical property value of the obtained liquid crystal composition D was measured, and the extrapolated value of the physical property of the liquid crystal compound (S3-1) was calculated by extrapolating the measured value.
  • a liquid crystal composition E comprising 90% by weight of the mother liquid crystal A of the liquid crystal compound (S4-1) and 10% by weight of (S4-1) obtained in Synthesis Example 2 was prepared.
  • the physical property value of the obtained liquid crystal composition E was measured, and the extrapolated value of the physical property of the liquid crystal compound (S4-1) was calculated by extrapolating the measured value.
  • (Synthesis Example 5) Synthesis of (S5-3)
  • Synthesis of Compound (S5-3) Synthesis from (S1-2) to (S5-1) was in accordance with the method of synthesizing (S1-5) to (S1-6) in Synthesis Example 1. At this time, (S1-2) was used instead of (S1-5).
  • the synthesis of (S5-1) to (S5-3) was in accordance with the method of synthesizing (S1-6) to (S1-8) in Synthesis Example 1. At this time, (S5-1) was used instead of (S1-6), and (S5-2) was used instead of (S1-7).
  • the phase transition temperature of the obtained compound (S5-3) was as follows. Phase transition temperature (° C.): K 63.1 N 88.5 I.
  • a liquid crystal composition F comprising 85% by weight of the mother liquid crystal A of the liquid crystal compound (S5-3) and 15% by weight of (S5-3) obtained in Synthesis Example 5 was prepared.
  • the physical property value of the obtained liquid crystal composition F was measured, and the extrapolated value of the physical property of the liquid crystal compound (S5-3) was calculated by extrapolating the measured value.
  • the liquid crystal compound (S5-3) has excellent compatibility with other liquid crystal compounds and has a large dielectric anisotropy ( ⁇ ) and refractive index anisotropy ( ⁇ n). I understood.
  • (Synthesis Example 6) Synthesis of (S6-1)
  • Synthesis of Compound (S6-1) Synthesis of (S6-1) was in accordance with the method of synthesizing (S5-3) of Synthesis Example 5.
  • a liquid crystal composition G comprising 85% by weight of the base liquid crystal A of the liquid crystal compound (S6-1) and 15% by weight of (S6-1) obtained in Synthesis Example 6 was prepared.
  • the physical property value of the obtained liquid crystal composition G was measured, and the extrapolated value of the physical property of the liquid crystal compound (S6-2) was calculated by extrapolating the measured value.
  • the liquid crystal compound (S6-1) has excellent compatibility with other liquid crystal compounds and has a large dielectric anisotropy ( ⁇ ) and refractive index anisotropy ( ⁇ n). I understood.
  • composition of the present invention the characteristic value of the liquid crystal composition can be measured according to the following method. Many of them are the methods described in the Standard of Electric Industries Association of Japan EIAJ ED-2521A or a modified method thereof. No TFT was attached to the TN device used for measurement.
  • NI Maximum temperature of nematic phase
  • a sample was placed on a hot plate of a melting point measuring device 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”.
  • T C Minimum temperature of nematic phase
  • Optically isotropic liquid crystal phase transition temperature Place the sample on the hot plate of a melting point measurement device equipped with a polarizing microscope, and in the crossed Nicols state, the sample was first heated to a temperature at which the sample becomes an isotropic liquid crystal phase Thereafter, the temperature was lowered at a rate of 1 ° C./min, and a completely chiral nematic phase or an optically isotropic liquid crystal phase appeared. The temperature at which the phase transition in the temperature lowering process was measured, then the temperature was increased at a rate of 1 ° C./min, and the temperature at which the phase transition in the temperature rising process was measured.
  • the phase transition temperature in the temperature raising process is defined as the phase transition temperature.
  • the phase transition temperature In the optically isotropic liquid crystal phase, when it was difficult to determine the phase transition temperature in the dark field under crossed Nicols, the phase transition temperature was measured by shifting the polarizing plate by 1 to 10 ° from the crossed Nicols state.
  • Viscosity ( ⁇ ; measured at 20 ° C .; mPa ⁇ s): An E-type viscometer was used for measurement.
  • Rotational viscosity ( ⁇ 1; measured at 25 ° C .; mPa ⁇ s): 1) Sample having positive dielectric anisotropy: Measurement was performed according to the method described in M. Imai et al., Molecular Crystals and Liquid Crystals, Vol. 259, 37 (1995). 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 ⁇ m. The voltage was applied to the TN device stepwise in the range of 16 to 19.5 volts every 0.5 volts. 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 (8) on page 40 of the paper by M. Imai et al.
  • the value of dielectric anisotropy necessary for this calculation was obtained by the following dielectric anisotropy measurement method using the element used for the measurement of the rotational viscosity.
  • the refractive index anisotropy was measured by this method.
  • the refractive index anisotropy was measured after the compound was mixed with an appropriate composition.
  • the refractive index anisotropy of the compound is an extrapolated value.
  • Dielectric Anisotropy ( ⁇ ; measured at 25 ° C.): When the sample was a compound, the compound was mixed with an appropriate composition, and then the dielectric anisotropy was measured. The dielectric anisotropy of the compound is an extrapolated value.
  • Threshold voltage (Vth; measured at 25 ° C .; V): When the sample was a compound, the threshold voltage was measured after mixing the compound with an appropriate composition. The threshold voltage of the compound is an extrapolated value.
  • a composition having a positive dielectric anisotropy a normally white mode (normally white mode) in which a distance (gap) between two glass substrates is (0.5 / ⁇ n) ⁇ m and a twist angle is 80 degrees.
  • ⁇ n is a value of refractive index anisotropy measured by the above method.
  • a rectangular wave having a frequency of 32 Hz was applied to this element. The voltage of the rectangular wave was increased and the value of the voltage when the transmittance of light passing through the element reached 90% was measured.
  • composition having a negative dielectric anisotropy For a normally black mode liquid crystal display element in which the distance (gap) between two glass substrates is about 9 ⁇ m and processed in homeotropic alignment A sample was placed. A rectangular wave having a frequency of 32 Hz was applied to this element. The voltage of the rectangular wave was raised, and the value of the voltage when the transmittance of light passing through the element reached 10% was measured.
  • Voltage holding ratio (VHR; measured at 25 ° C .;%):
  • the TN device used for the measurement has a polyimide alignment film, and the distance between two glass substrates (cell gap) is 6 ⁇ m. This element was sealed with an adhesive polymerized by ultraviolet rays after putting a sample.
  • the TN device was charged by applying a pulse voltage (60 microseconds at 5 V).
  • the decaying voltage was measured for 16.7 milliseconds with a high-speed voltmeter, and the area A between the voltage curve and the horizontal axis in a unit cycle was determined.
  • the area B is an area when it is not attenuated.
  • the voltage holding ratio is a percentage of the area A with respect to the area B.
  • the pitch length was measured using selective reflection (Liquid Crystal Manual 196 (issued in 2000, Maruzen).
  • the selective reflection wavelength is a microspectrophotometer (JEOL Ltd., product)
  • the pitch was determined by dividing the obtained reflection wavelength by the average refractive index.
  • the pitch of a cholesteric liquid crystal having a reflection wavelength in the longer wavelength region than visible light is proportional to the reciprocal of the concentration of the chiral agent in a region where the chiral agent concentration is low, so the pitch length of a liquid crystal having a selective reflection wavelength in the visible light region is Several points were measured and obtained by linear extrapolation.
  • the ratio (percentage) of the component or liquid crystal compound is a weight percentage (% by weight) based on the total weight of the liquid crystal compound.
  • the composition is prepared by measuring the weight of components such as a liquid crystal compound and then mixing them. Therefore, it is easy to calculate the weight percentage of the component.
  • Example 1 A liquid crystal composition A was prepared by mixing the liquid crystal compounds shown in the figure below at the following ratio. The correspondence with the general formula is shown on the right side of the structural formula. Liquid crystal composition A
  • a liquid crystal composition B composed of a liquid crystal composition A (94 wt%) and a chiral agent ISO-60BA2 (6 wt%) represented by the following formula was obtained.
  • ISO-60BA2 was obtained by esterifying isosorbide and 4-hexyloxybenzoic acid in the presence of dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine.
  • DCC dicyclohexylcarbodiimide
  • ISO-6OBA2 4-dimethylaminopyridine
  • Example 2 Preparation of Mixture of Monomer and Liquid Crystal Composition
  • liquid crystal composition B 79.4% by weight of liquid crystal composition B, 10.0% by weight of n-dodecyl acrylate, 1,4-di (4- (6 Liquid crystal composition CM in which 10.0% by weight of (acryloyloxy) hexyloxy) benzoyloxy) -2-methylbenzene and 0.6% by weight of 2,2′-dimethoxyphenylacetophenone as a photopolymerization initiator are mixed
  • CM 1,4-di (4- (6 Liquid crystal composition CM in which 10.0% by weight of (acryloyloxy) hexyloxy) benzoyloxy) -2-methylbenzene and 0.6% by weight of 2,2′-dimethoxyphenylacetophenone as a photopolymerization initiator are mixed.
  • the polymer / liquid crystal composite material CP thus obtained maintained an optically isotropic liquid crystal phase even when cooled to room temperature.
  • the electrodes of the comb-shaped electrode substrate are alternately arranged with electrodes 1 extending from the left side and electrodes 2 extending from the right side. Therefore, when there is a potential difference between the electrode 1 and the electrode 2, it is possible to provide a state in which electric fields in two directions, ie, an upper direction and a lower direction, exist on the comb-shaped electrode substrate as shown in FIG.
  • Example 3 The cell sandwiched between the polymer / liquid crystal composite material C-1P obtained in Example 2 was set in the optical system shown in FIG. 2, and the electro-optical characteristics were measured.
  • a white light source of a polarizing microscope (Nikon Eclipse LV100POL) is used as the light source, the incident angle to the cell is perpendicular to the cell surface, and the line direction of the comb-shaped electrode is 45 with respect to the Polarizer and Analyzer polarizer, respectively.
  • the cell was set in the optical system so that the temperature was 0 °.
  • Example 4 A liquid crystal composition D was prepared by mixing the liquid crystal compounds shown in the figure below at the following ratio. The correspondence with the general formula is shown on the right side of the structural formula. Liquid crystal composition D
  • liquid crystal composition E composed of a liquid crystal composition D (94 wt%) and a chiral agent 2 (6.1 wt%) represented by the following formula was obtained.
  • Example 5 Preparation of Mixture of Monomer and Liquid Crystal Composition
  • liquid crystal composition E 87.4% by weight of liquid crystal composition E, 6.0% by weight of n-dodecyl acrylate, 1,4-di (4- (6 Liquid crystal composition FM in which 6.0% by weight of (acryloyloxy) propyloxy) benzoyloxy) -2-methylbenzene and 0.6% by weight of 2,2′-dimethoxyphenylacetophenone as a photopolymerization initiator are mixed.
  • 1,4-di (4- (6 Liquid crystal composition FM in which 6.0% by weight of (acryloyloxy) propyloxy) benzoyloxy) -2-methylbenzene and 0.6% by weight of 2,2′-dimethoxyphenylacetophenone as a photopolymerization initiator are mixed.
  • the liquid crystal composition FM was sandwiched between a comb-shaped electrode substrate not subjected to alignment treatment and a counter glass substrate (non-electrode provided) (cell thickness 10 ⁇ m), and obtained.
  • the cell was heated at 77.0 ° C. In this state, ultraviolet light (ultraviolet light intensity 23 mWcm ⁇ 2 (365 nm)) was irradiated for 1 minute to carry out a polymerization reaction.
  • the polymer / liquid crystal composite material FP thus obtained maintained an optically isotropic liquid crystal phase even when cooled to room temperature.
  • the electrodes of the comb-shaped electrode substrate are alternately arranged with electrodes 1 extending from the left side and electrodes 2 extending from the right side. Therefore, when there is a potential difference between the electrode 1 and the electrode 2, it is possible to provide a state in which electric fields in two directions, ie, an upper direction and a lower direction, exist on the comb-shaped electrode substrate as shown in FIG.
  • Example 6 The cell sandwiched with the polymer / liquid crystal composite material FP obtained in Example 5 was set in the optical system shown in FIG. 2, and the electro-optical characteristics were measured.
  • a white light source of a polarizing microscope (Nikon Eclipse LV100POL) is used as the light source, the incident angle to the cell is perpendicular to the cell surface, and the line direction of the comb-shaped electrode is 45 with respect to the Polarizer and Analyzer polarizer, respectively.
  • the cell was set in the optical system so that the temperature was 0 °.
  • a liquid crystal composition G was prepared by mixing the liquid crystal compound shown in the figure below with the above liquid crystal composition D and the following compound (16-16a) in a weight ratio of 85/15.
  • liquid crystal composition H composed of the liquid crystal composition G (94 wt%) and the chiral agent 2 (7.0 wt%) was obtained.
  • Example 8 Preparation of Mixture of Monomer and Liquid Crystal Composition
  • the liquid crystal composition H is 87.4% by weight
  • n-dodecyl acrylate is 6.0% by weight
  • 1,4-di (4- (6 Liquid crystal composition IM in which 6.0% by weight of (acryloyloxy) propyloxy) benzoyloxy) -2-methylbenzene and 0.6% by weight of 2,2′-dimethoxyphenylacetophenone as a photopolymerization initiator are mixed.
  • Liquid crystal composition IM was sandwiched between a comb-shaped electrode substrate not subjected to alignment treatment and a counter glass substrate (non-electrode provided) (cell thickness 10 ⁇ m), and obtained. The cell was heated at 60.0 ° C. In this state, ultraviolet light (ultraviolet light intensity 23 mWcm ⁇ 2 (365 nm)) was irradiated for 1 minute to carry out a polymerization reaction.
  • the thus obtained polymer / liquid crystal composite material IP maintained an optically isotropic liquid crystal phase even when cooled to room temperature.
  • the electrodes of the comb-shaped electrode substrate are alternately arranged with electrodes 1 extending from the left side and electrodes 2 extending from the right side. Therefore, when there is a potential difference between the electrode 1 and the electrode 2, it is possible to provide a state in which electric fields in two directions, ie, an upper direction and a lower direction, exist on the comb-shaped electrode substrate as shown in FIG.
  • Example 9 The cell sandwiched with the polymer / liquid crystal composite material IP obtained in Example 8 was set in the optical system shown in FIG. 2, and the electro-optical characteristics were measured.
  • a white light source of a polarizing microscope (Nikon Eclipse LV100POL) is used as the light source, the incident angle to the cell is perpendicular to the cell surface, and the line direction of the comb-shaped electrode is 45 with respect to the Polarizer and Analyzer polarizer, respectively.
  • the cell was set in the optical system so that the temperature was 0 °.
  • an optical element such as a display element using a liquid crystal medium can be mentioned.

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Abstract

L'invention porte sur un milieu cristal liquide qui présente une large plage de température de phase cristal liquide, une grande anisotropie d'indice de réfraction, une grande anisotropie de constante diélectrique et une phase de cristal liquide optiquement isotrope. Le milieu cristal liquide est caractérisé par le fait qu'il contient un composé cristal liquide ayant quatre noyaux benzéniques et du difluorométhylèneoxy, et un composé chiral, et présente une phase cristal liquide optiquement isotrope.
PCT/JP2009/068393 2008-11-19 2009-10-27 Milieu cristal liquide optiquement isotrope et élément optique correspondant WO2010058681A1 (fr)

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US13/129,578 US8501285B2 (en) 2008-11-19 2009-10-27 Optically isotropic liquid crystal medium and optical device
CN200980145801.4A CN102216424B (zh) 2008-11-19 2009-10-27 光等向性的液晶介质与光元件
JP2010539193A JP5477296B2 (ja) 2008-11-19 2009-10-27 光学的に等方性の液晶媒体及び光素子
EP09827462.4A EP2360229B1 (fr) 2008-11-19 2009-10-27 Milieu cristal liquide optiquement isotrope et élément optique correspondant
US13/927,128 US8686196B2 (en) 2008-11-19 2013-06-26 Optically isotropic liquid crystal medium and optical device

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