WO2010074071A1 - 含フッ素液晶化合物、液晶組成物および液晶電気光学素子 - Google Patents
含フッ素液晶化合物、液晶組成物および液晶電気光学素子 Download PDFInfo
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- C09K19/0403—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit the structure containing one or more specific, optionally substituted ring or ring systems
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- 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
- C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
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- C07C22/02—Cyclic compounds containing halogen atoms bound to an acyclic carbon atom having unsaturation in the rings
- C07C22/04—Cyclic compounds containing halogen atoms bound to an acyclic carbon atom having unsaturation in the rings containing six-membered aromatic rings
- C07C22/08—Cyclic compounds containing halogen atoms bound to an acyclic carbon atom having unsaturation in the rings containing six-membered aromatic rings containing fluorine
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- 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
- C09K19/14—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a carbon chain
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- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
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- 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
- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
- C09K19/3001—Cyclohexane rings
- C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
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- 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
- C09K2019/0459—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 -CF=CF- chain, e.g. 1,2-difluoroethen-1,2-diyl
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- 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
- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
- C09K19/3001—Cyclohexane rings
- C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
- C09K2019/3004—Cy-Cy
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- C09K19/00—Liquid crystal materials
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- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
- C09K19/3001—Cyclohexane rings
- C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
- C09K2019/3009—Cy-Ph
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- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/02—Alignment layer characterised by chemical composition
Definitions
- the present invention relates to a fluorine-containing liquid crystal compound having liquid crystallinity, a liquid crystal composition containing the same, and a liquid crystal electro-optical element.
- Liquid crystal electro-optic elements include portable devices such as mobile phones and PDAs, display devices for office automation equipment such as copying machines and personal computer monitors, display devices for home appliances such as liquid crystal televisions, clocks, calculators, measuring instruments, and automobiles. Widely used in instruments, cameras, etc., various performances such as a wide operating temperature range, a low operating voltage, high-speed response, and chemical stability are required.
- a material exhibiting a liquid crystal phase is used for such a liquid crystal electro-optical element, but at present, not all of these properties are satisfied by a single compound, and one or more excellent properties are obtained.
- a plurality of liquid crystal compounds and non-liquid crystal compounds are mixed to satisfy the required performance as a liquid crystal composition.
- liquid crystal compound having properties such as excellent high-speed response in a wide temperature range and being capable of being driven at a low voltage when used in a liquid crystal optical element.
- the present inventor has introduced a fluoroalkenyl group having a specific structure shown below, and thereby has a novel rotational inclusion ( ⁇ 1) having a low elastic viscosity (K 11 , K 33 ). It came to provide a fluorine liquid crystal compound.
- the fluorine-containing liquid crystal compound represented by the formula (1) is referred to as a compound (1), and the compounds represented by other formulas are also described in the same manner.
- the present invention provides compound (1).
- R 1 - (A 1 -Z 1 ) a- (A 2 -Z 2) b- (A 3 -Z 3) c-A 4 - (CH 2) n-CF CF-R 2 (1)
- R 1 a hydrogen atom, a halogen atom or an alkyl group having 1 to 10 carbon atoms.
- R 2 a halogen atom or an alkyl group having 1 to 10 carbon atoms.
- one or more hydrogen atoms in the alkyl group in R 1 and R 2 may be substituted with a halogen atom, and an etheric group may be present between carbon-carbon atoms in the alkyl group or at the bond terminal of the alkyl group.
- An oxygen atom or a thioetheric sulfur atom may be inserted.
- a 1 , A 2 , A 3 and A 4 independently of each other, a phenylene group or a cyclohexylene group.
- one or more hydrogen atoms in the groups A 1 , A 2 , A 3 and A 4 may be substituted with a halogen atom, and one or two —CH ⁇ present in the group may be nitrogen.
- R 1 is a fluorine atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group, a fluoroalkyl group or a fluoroalkoxy group
- R 2 is a fluorine atom and an alkyl group having 1 to 5 carbon atoms. It is preferable.
- n is preferably 2
- R 2 is preferably a fluorine atom or an alkyl group having 1 to 5 carbon atoms.
- Compound (1) preferably has a + b + c of 2 or less.
- the present invention also provides a liquid crystal composition containing the liquid crystal compound (1).
- the present invention also provides a liquid crystal electro-optical element in which a liquid crystal composition containing the liquid crystal compound (1) is sandwiched between substrates with electrodes.
- the fluorine-containing liquid crystal compound of the present invention has a low rotational viscosity ( ⁇ 1) and appropriate elastic constants (K 11 , K 33 ). Further, it is excellent in compatibility with other liquid crystal compounds or non-liquid crystal compounds and is chemically stable. Furthermore, in the fluorine-containing liquid crystal compound of the present invention, by setting n to 2, it has a wider liquid crystal temperature range and a higher clearing point (Tc) than a compound having a similar structure. Moreover, the liquid crystal composition containing the liquid crystal compound of the present invention has a small viscosity and a low threshold voltage. Further, by using the liquid crystal composition of the present invention, a liquid crystal electro-optical element having excellent responsiveness can be obtained.
- R 1 and R 2 have the same meaning as described above.
- substitution with a halogen atom and insertion of an etheric oxygen atom or a thioetheric sulfur atom may be performed simultaneously on the same alkyl group.
- Examples of the group in which one or more hydrogen atoms in a monovalent alkyl group having 1 to 10 carbon atoms are substituted with a halogen atom include a fluoroalkyl group and a chloroalkyl group. Furthermore, examples of the group in which an etheric oxygen atom or a thioetheric sulfur atom is inserted between carbon-carbon atoms in these groups include alkoxyalkyl groups and alkylthioalkyl groups. Examples of the group in which an etheric oxygen atom or a thioetheric sulfur atom is inserted at the bond terminal of the group include an alkoxy group and an alkylthio group.
- examples of the group in which substitution with a halogen atom and insertion of an etheric oxygen atom are performed on the same alkyl group include a fluoroalkoxy group. These groups may be either linear or branched, but are preferably linear.
- alkyl group having 1 to 10 carbon atoms an alkyl group having 1 to 5 carbon atoms is preferable, and a methyl group, a propyl group, or a pentyl group is particularly preferable.
- the alkoxy group having 1 to 10 carbon atoms is preferably an alkoxy group having 1 to 5 carbon atoms, particularly preferably an ethoxy group or a butoxy group.
- fluoroalkyl group having 1 to 10 carbon atoms a fluoroalkyl group having 1 to 5 carbon atoms is preferable, and a trifluoromethyl group is particularly preferable.
- the fluoroalkoxy group having 1 to 10 carbon atoms is preferably a fluoroalkoxy group having 1 to 5 carbon atoms, and particularly preferably a trifluoromethoxy group.
- a fluorine atom or a chlorine atom is preferable, and a fluorine atom is particularly preferable.
- R 1 is preferably a halogen atom or an alkyl group having 1 to 10 carbon atoms.
- One or more hydrogen atoms in the alkyl group may be substituted with a fluorine atom, and an etheric oxygen atom or a thioetheric sulfur atom is inserted between carbon-carbon atoms in the group or at the bond terminal of the group.
- a fluorine atom, a linear alkyl group having 1 to 10 carbon atoms, an alkoxy group, a fluoroalkyl group, or a fluoroalkoxy group is preferable.
- a fluorine atom, a linear alkyl group having 1 to 5 carbon atoms, an alkoxy group, a fluoroalkyl group, or a fluoroalkoxy group is more preferable.
- R 2 is preferably a fluorine atom or a linear alkyl group having 1 to 10 carbon atoms. Further, a fluorine atom or a linear alkyl group having 1 to 5 carbon atoms is more preferable.
- a 1 , A 2 , A 3 and A 4 have the same meaning as described above.
- a 1 , A 2 , A 3 and A 4 are preferably 1,4-cyclohexylene group or 1,4-phenylene group because the compound has a linear structure and is easy to use for liquid crystal.
- the 1,4-phenylene group is substituted with one or more fluorine atoms.
- Examples of the 1,4-phenylene group substituted by one or more fluorine atoms include 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, and 2,3-difluoro-1 A 4-phenylene group is preferred.
- Z 1 , Z 2 and Z 3 have the same meaning as described above. Note that the substitution with a halogen atom and the insertion of an etheric oxygen atom or a thioetheric sulfur atom may be simultaneously performed on the same aliphatic hydrocarbon group.
- Z 1 When Z 1 is a single bond, it means that the ring groups on both sides of Z 1 are directly bonded. For example, when Z 1 is a single bond and b is 0, A 1 and A 3 are directly bonded. Further, when Z 1 is a single bond and b is 1, A 1 and A 2 are directly bonded. The same applies to Z 2 and Z 3 .
- Examples of the divalent aliphatic hydrocarbon group include an alkylene group having 1 to 4 carbon atoms, an alkenylene group having 2 to 4 carbon atoms, and an alkynylene group having 2 to 4 carbon atoms.
- Examples of the group in which a hydrogen atom in these groups is substituted with a halogen atom include a fluoroalkylene group, a chloroalkylene group, and a fluoroalkenylene group.
- groups in which an etheric oxygen atom or a thioetheric sulfur atom is inserted between carbon-carbon atoms in these groups or at the bond terminal of the group include oxyalkylene groups, alkyloxyalkylene groups, thioalkylene groups, oxyalkylene groups, Examples include a fluoroalkylene group or a thiofluoroalkylene group.
- alkylene group -CH 2 -, - CH 2 CH 2 -, - CH 2 CH 2 CH 2 - or -CH 2 CH 2 CH 2 CH 2 - .
- -CH 2 - or -CH 2 CH 2- is preferred.
- Alkenylene groups include —CH ⁇ CH—, —CH ⁇ CH—CH 2 —, —CH ⁇ CH—CH 2 —CH 2 —, —CH ⁇ CH—CH ⁇ CH— or —CH 2 —CH ⁇ CH—.
- CH 2 — can be mentioned, and —CH ⁇ CH— is particularly preferable.
- n is 2, and R 2 is preferably a fluorine atom or an alkyl group having 1 to 5 carbon atoms, more preferably n is 2 and R 2 is a fluorine atom. preferable.
- the liquid crystal compound (1) of the present invention can be synthesized by the following method.
- the liquid crystal compound (1) is a compound in which R2 is a fluorine atom (compound (1 ⁇ ))
- the compound (2) is metalated and then reacted with tetrafluoroethylene as shown in the following reaction formula.
- Compound (1 ⁇ ) can be obtained.
- the compound (1 ⁇ ) can be obtained by reacting the metalated product of the compound (3).
- R 1 , R 2 , A 1 , A 2 , A 3 , A 4 , Z 1 , Z 2 , Z 3 , Z 4 , A, b, c and n are the same as in the liquid crystal compound (1).
- R 2 ′ in formula (3) and formula (1 ⁇ ) is the same as defined when R 2 in formula (1) is an alkyl group having 1 to 10 carbon atoms.
- R 2 is a halogen atom other than a fluorine atom, for example, a chlorine atom
- Compound (1) can be obtained.
- the amount of the electron transfer agent to be used is 0.01 to 4 times mol, preferably 0.1 to 2.5 times mol, with respect to compound (2) or compound (3).
- the reaction is likely to proceed without the coexistence of an electron transfer agent. This is preferable because the product can be easily purified.
- the amount of metallic lithium used in lithiation is 2 to 5 times mol, preferably 2 to 3 times mol, of compound (2) or compound (3).
- the amount of metal magnesium used is 1 to 5 moles, preferably 1 to 1.5 moles. .
- reaction solvents include aromatic hydrocarbon solvents such as benzene, toluene, xylene, ethylbenzene, aliphatic hydrocarbon solvents such as pentane, hexane, heptane, octane, tetrahydrofuran, diethyl ether, dibutyl ether, t-butyl methyl ether, etc.
- Ether solvents, petroleum ethers, or a suitable mixed solvent of the above solvents can be used, and ether solvents or a mixed solvent of an ether solvent and an aliphatic hydrocarbon solvent is particularly preferable.
- the amount of solvent varies greatly depending on the scale of synthesis, and can be changed as appropriate.
- a volume (mL) of 0.1 to 10,000 times with respect to 1 mol of the compound (2) or compound (3), and a volume of 0.5 to 3000 times ( More preferably, mL) is used.
- the reaction temperature of the metalation reaction of the compound (2) and the compound (3) is preferably ⁇ 100 ° C. to 100 ° C., particularly preferably ⁇ 80 ° C. to 70 ° C.
- the reaction time for the metalation reaction of compound (2) and compound (3) is preferably 0.5 to 48 hours, particularly preferably 0.5 to 8 hours.
- the compound (1 ⁇ ) can be obtained by continuously reacting with tetrafluoroethylene without isolation. That is, it is carried out by passing tetrafluoroethylene gas through the reaction liquid after completion of metalation.
- the amount of tetrafluoroethylene to be used is 1 to 10 times mol, preferably 1 to 3 times mol, of compound (2).
- tetrafluoroethylene may be diluted with an inert gas such as nitrogen or argon. Although the dilution ratio is arbitrary, the ratio of tetrafluoroethylene is preferably 30% by volume to 70% by volume from the viewpoint of safety and efficiency.
- the reaction temperature between the lithiated product and tetrafluoroethylene is preferably -100 ° C to 25 ° C, particularly preferably -80 ° C to 0 ° C.
- the reaction temperature between the Grignard reagent and tetrafluoroethylene is preferably -100 ° C to 80 ° C, particularly preferably 0 ° C to 50 ° C.
- the reaction time is preferably 0.5 to 48 hours, particularly preferably 0.5 to 24 hours.
- the compound (1 ⁇ ) can be obtained by carrying out normal post-treatment operations and purification operations.
- Compound (1 ⁇ ) is obtained by reacting compound (1 ⁇ ) with the metalated product of compound (3).
- the compound (1 ⁇ ) may be added to the separately prepared metalation reaction solution of the compound (3) as described above, or the separately prepared compound (3) metalation reaction solution is added to the compound (1 ⁇ ). May be.
- Compound (1 ⁇ ) may be diluted with a solvent in advance.
- Diluting solvents include aromatic hydrocarbon solvents such as benzene, toluene, xylene, ethylbenzene, aliphatic hydrocarbon solvents such as pentane, hexane, heptane, octane, tetrahydrofuran, diethyl ether, dibutyl ether, t-butyl methyl ether, etc.
- Ether solvents, petroleum ethers, or a suitable mixed solvent of the above solvents can be used, and ether solvents or a mixed solvent of an ether solvent and an aliphatic hydrocarbon solvent are particularly preferable.
- the amount of diluting solvent varies greatly depending on the scale of synthesis and can be changed as appropriate. For example, in the case of a lab scale, it is preferable to use a volume (mL) of 0.1 to 2000 times, and a volume (mL) of 0.5 to 1000 times with respect to 1 mol of compound (1 ⁇ ). Is more preferable.
- the reaction temperature is preferably from ⁇ 100 ° C. to 100 ° C., in the case of the lithiated compound (3), particularly preferably from ⁇ 80 ° C. to 25 ° C., and in the case of the Grignard reagent of compound (3), particularly from 0 ° C. to 70 ° C is preferred.
- the reaction time is preferably 0.5 to 48 hours, particularly preferably 0.5 to 24 hours.
- a novel fluorine-containing compound represented by the compound (1) can be obtained by carrying out normal post-treatment operations and purification operations.
- a liquid crystal composition having excellent performance can be obtained by mixing at least one of the fluorine-containing liquid crystal compound (1) of the present invention with another liquid crystal compound and / or a non-liquid crystal compound.
- the fluorine-containing liquid crystal compound (1) of the present invention is added to a conventional liquid crystal composition, effects such as reduction in viscosity and optimization of elastic constants can be expected.
- the fluorine-containing liquid crystal compound (1) of the present invention is not usually used alone for a liquid crystal electro-optical element, but is a liquid crystal composition that is a mixture with other liquid crystal compounds. Used for optical elements and the like. Since the fluorine-containing liquid crystal compound (1) of the present invention used as a component of the liquid crystal composition has a low rotational viscosity, the composition of the fluorine-containing liquid crystal compound (1) of the present invention causes the rotational viscosity of the liquid crystal composition. ( ⁇ 1) can be reduced, and as a result, the response of a liquid crystal electro-optical element using the liquid crystal composition can be improved.
- the use of the fluorine-containing liquid crystal compound (1) of the present invention is not particularly limited, but is used as a component of a liquid crystal composition for a liquid crystal electro-optical element, particularly for a liquid crystal display element, because of its excellent characteristics. Is particularly useful.
- the liquid crystal composition of the present invention contains 1% by mass or more of the fluorine-containing liquid crystal compound of the present invention and 60% by mass or more of other liquid crystal compounds. Two or more kinds of other liquid crystal compounds may be contained. When the content of the fluorinated liquid crystal compound of the present invention in the liquid crystal composition of the present invention is less than the above range, the characteristics of the fluorinated liquid crystal compound of the present invention are not sufficiently exhibited.
- the liquid crystal composition of the present invention may contain a non-liquid crystal compound in addition to these liquid crystal compounds.
- the non-liquid crystal compound include chiral agents, dyes, stabilizers, and various functional compounds blended in other liquid crystal compositions. Some chiral agents, dyes, and the like have a liquid crystal. In the present invention, such a functional compound having liquid crystal properties is classified as a liquid crystal.
- Liquid crystal compositions for liquid crystal electro-optical elements are usually composed of a mixture of various liquid crystal compounds.
- the liquid crystal composition for this use often contains 5 or more (especially 10 or more) liquid crystal compounds.
- the content of one kind of liquid crystal compound with respect to all liquid crystal compounds in the liquid crystal composition rarely exceeds 50% by mass, and is usually 30% by mass or less. Therefore, each liquid crystal compound in the liquid crystal composition is often in the range of 1 to 25% by mass.
- Certain liquid crystal compounds contained in the liquid crystal composition may be less than 1% by mass (usually 0.1% by mass or more), but such a small amount may be contained in the liquid crystal composition. Has technical significance.
- the liquid crystal composition for this use often contains a chiral agent, but the content is usually 10% by mass or less, particularly 5% by mass or less, based on the total liquid crystal compounds.
- the liquid crystal compound in the present invention is not limited to a compound exhibiting liquid crystallinity at room temperature as a single compound. When the liquid crystal composition is used for a certain application, the liquid crystal composition in the liquid crystal composition at the use temperature is used. Any compound may be used as long as it exhibits properties.
- the single compound may be a solid at room temperature or a compound exhibiting liquid crystallinity at the use temperature when dissolved in a liquid crystal composition.
- the liquid crystal composition of the present invention preferably contains 1 to 30% by mass of the fluorine-containing liquid crystal compound of the present invention and 60% by mass or more of other liquid crystal compounds. It is more preferable to contain 1 to 25% by mass of the above fluorinated liquid crystal compound and 70% by mass or more of other liquid crystal compounds.
- the content of other liquid crystal compounds is preferably 99% by mass or less.
- the total amount of the fluorine-containing liquid crystal compound of the present invention and other liquid crystal compounds is preferably 90% by mass or more, particularly 95% by mass or more based on the liquid crystal composition.
- the ratio of the fluorine-containing liquid crystal compound of the present invention is the total amount of these two or more kinds of the liquid crystal compounds of the present invention. Represents.
- R 3 and R 4 represent an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group, a halogen atom or a cyano group.
- R 3 and R 4 may be the same or different from each other.
- Cy represents a 1,4-cyclohexylene group
- Ph represents a 1,4-phenylene group in which one or more hydrogen atoms may be substituted with fluorine atoms.
- the hydrogen atom present in the ring structure or terminal group in the compound may be substituted with a halogen atom, a cyano group, a methyl group, or the like.
- the ring group Cy and the ring group Ph may be substituted with a pyrimidine ring or a dioxane ring.
- the linking group between the ring groups is —CH 2 O—, —CH ⁇ CH—, —N ⁇ N—, —CH ⁇ N—, —COOCH 2 —, —OCOCH 2 — or — It may be changed to COCH 2 -or the like. These can be selected according to the desired performance.
- the present invention provides a liquid crystal electro-optical element that is suitably used as a constituent material of a liquid crystal phase.
- the liquid crystal electro-optical element of the present invention is a liquid crystal electro-optical element in which the liquid crystal composition of the present invention is sandwiched between substrates with electrodes.
- the liquid crystal electro-optical element of the present invention is not particularly limited except that the liquid crystal composition of the present invention is used, and the configuration of a normal liquid crystal electro-optical element can be adopted.
- liquid crystal electro-optical element of the present invention for example, an electric circuit constituted by sandwiching a liquid crystal phase formed by injecting the liquid crystal composition of the present invention into a liquid crystal cell between two substrates provided with electrodes.
- a liquid crystal electro-optical element having an optical element part is exemplified.
- the liquid crystal electro-optic element is driven in various modes such as TN mode, STN mode, guest-host (GH) mode, dynamic scattering mode, phase change mode, DAP mode, dual frequency drive mode, and ferroelectric liquid crystal display mode. What is done.
- an undercoat layer such as SiO 2 or Al 2 O 3 or a color filter layer is formed on a substrate such as plastic or glass, and electrodes such as In 2 O 3 —SnO 2 (ITO) or SnO 2 are formed.
- an overcoat layer of polyimide, polyamide, SiO 2 , Al 2 O 3 or the like is formed, aligned, printed with a sealing material, and the electrode surfaces are opposed to each other. Disposed to seal the periphery and harden the sealing material to form an empty cell.
- a composition containing the compound of the present invention is injected, and the injection port is sealed with a sealant to form a liquid crystal cell.
- This liquid crystal cell is laminated with a polarizing plate, a color polarizing plate, a light source, a color filter, a transflective plate, a reflecting plate, a light guide plate, an ultraviolet cut filter, etc., printed with characters, figures, etc., and non-glare processed.
- a liquid crystal electro-optical element is obtained by a liquid crystal electro-optical element.
- the above description describes the basic configuration and manufacturing method of the liquid crystal element, and other configurations can be adopted.
- Various configurations can be used.
- the composition of the present invention is also suitable for active matrix devices such as TFT and MIM.
- modes other than the TN type described above that is, a super twist nematic (STN) type liquid crystal element with a high twist angle, a guest-host (GH) type liquid crystal element using a polychromatic dye, and a liquid crystal with a lateral electric field.
- STN super twist nematic
- GH guest-host
- IPS In-plane switching
- VA liquid crystal element that aligns liquid crystal molecules vertically with respect to the substrate
- ferroelectric liquid crystal element etc. it can. Further, it can be used not only in a method of electrically writing but also in a method of writing by heat.
- the measurement is performed by the following method. First, 20% by mass of the obtained liquid crystal compound and 80% by mass 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 shown in the following equation. This extrapolated value is taken as the physical property value of this compound.
- ⁇ Extrapolated value> (100 ⁇ ⁇ Measured value of sample> ⁇ ⁇ mass% of mother liquid crystal> ⁇ ⁇ Measured value of mother liquid crystal>) / ⁇ mass% of liquid crystalline compound> Even if the ratio between the liquid crystal compound and the mother liquid crystal is this ratio, when the smectic phase or crystal precipitates at 25 ° C., the ratio between the liquid crystal compound and the mother liquid crystal is 10% by mass: 90% by mass, 5% by mass: 95% by mass was changed in order, and the physical property value of the sample was measured with a composition in which the smectic phase or crystal was not precipitated at 25 ° C., and an extrapolated value was obtained according to the above formula. The physical property values of the liquid crystal compound are used.
- ZLI-1565 As a mother liquid crystal used for the measurement, a liquid crystal composition ZLI-1565 manufactured by Merck & Co. was used.
- the liquid crystal composition used for the measurement is, for example, by mixing and shaking each compound when the compound constituting each component is liquid, and mixing each compound when containing a solid. It can be prepared by making each liquid by heating and then shaking.
- Phase structure and transition temperature (°C) Measurement was performed by the methods (1) and (2) below.
- a sample (compound itself) is placed on a hot plate (Mettler FP-82HT type hot stage) of a melting point measuring apparatus equipped with a polarizing microscope, and the phase state and its change are polarized while heating at a rate of 1 ° C./min. The type of phase was identified by observation with a microscope.
- the crystal was expressed as C.
- the smectic phase is represented as Sm
- the nematic phase is represented as N.
- the liquid (isotropic) was designated as I.
- C 50.0 N 100.0 I means that the transition temperature (CN) from the crystal to the nematic phase is 50.0 ° C.
- the transition temperature from the nematic phase to the liquid ( NI) is 100.0 ° C. The same applies to other notations.
- Example 7 A liquid crystal composition prepared by mixing 90 mol% (89% by mass) of a liquid crystal composition “ZLI-1565” manufactured by Merck and 10 mol% (11% by mass) of the compound (1a-1-1) of the present invention. Adjusted. This liquid crystal composition is referred to as a liquid crystal composition A.
- Example 8 A liquid crystal composition comprising 90% by mol (89% by mass) of a liquid crystal composition “ZLI-1565” manufactured by Merck Co., Ltd. and 10% by mol (11% by mass) of the compound (1a-2-1) of the present invention. Adjusted. This liquid crystal composition is referred to as a liquid crystal composition B.
- Example 9 A liquid crystal composition comprising 90% by mol (89% by mass) of a liquid crystal composition “ZLI-1565” manufactured by Merck Co., Ltd. and 10% by mol (11% by mass) of the compound (1b-2-1) of the present invention. Adjusted. This liquid crystal composition is referred to as a liquid crystal composition C.
- Example 12 A liquid crystal composition comprising 90% by mole (89% by mass) of a liquid crystal composition “ZLI-1565” manufactured by Merck Co., Ltd. and 10% by mole (11% by mass) of the compound (1b-0-2) of the present invention. Adjusted.
- This liquid crystal composition is referred to as a liquid crystal composition G.
- Example 13 A liquid crystal composition comprising 90% by mol (89% by mass) of a liquid crystal composition “ZLI-1565” manufactured by Merck Co., Ltd. and 10% by mol (11% by mass) of the compound (1a-2-1) of the present invention. Adjusted.
- This liquid crystal composition is referred to as a liquid crystal composition H.
- Example 14 A liquid crystal composition comprising 90 mol% (89 mass%) of a liquid crystal composition “ZLI-1565” manufactured by Merck Co., Ltd. and 10 mol% (11 mass%) of the compound (1b-0-3) of the present invention. Adjusted. This liquid crystal composition is referred to as a liquid crystal composition I.
- the compound of the present invention has a low rotational viscosity ( ⁇ 1) and can adjust a composition having appropriate elastic constants (K 11 and K 33 ).
- ⁇ 1 rotational viscosity
- K 11 and K 33 appropriate elastic constants
Abstract
Description
また、本発明は、前記含フッ素液晶化合物を含み、充分に低粘性であり、低いしきい値電圧を有する液晶組成物、およびそれを用いた高速応答性を示す液晶光学素子の提供を目的とする。
R1-(A1-Z1)a-(A2-Z2)b-(A3-Z3)c-A4-(CH2)n-CF=CF-R2 (1)
[ただし、式(1)中の記号は、以下の意味を示す。
R1:水素原子、ハロゲン原子または炭素数1~10のアルキル基。
R2:ハロゲン原子または炭素数1~10のアルキル基。ただし、R1およびR2におけるアルキル基中の一つ以上の水素原子がハロゲン原子で置換されていてもよく、該アルキル基中の炭素-炭素原子間または該アルキル基の結合末端に、エーテル性酸素原子またはチオエーテル性硫黄原子が挿入されていてもよい。
A1、A2、A3およびA4:相互に独立して、フェニレン基またはシクロヘキシレン基。ただし、A1、A2、A3およびA4の基中の一つ以上の水素原子がハロゲン原子で置換されていてもよく、該基中に存在する一つまたは二つの-CH=が窒素原子で置換されていてもよく、該基中に存在する一つまたは二つの-CH2-がエーテル性酸素原子またはチオエーテル性硫黄原子で置換されていてもよい。
Z1、Z2およびZ3:相互に独立して、単結合、-O-、-S-または炭素数1~4の二価の脂肪族炭化水素基。ただし、該脂肪族炭化水素基中の一つ以上の水素原子がハロゲン原子で置換されていてもよく、該脂肪族炭化水素基中の炭素-炭素原子間または該脂肪族炭化水素基の結合末端に、エーテル性酸素原子またはチオエーテル性硫黄原子が挿入されていてもよい。
a、b、c:相互に独立して0または1。ただし、a+b+cは1以上。
n:0~3の整数。ただし、A4がフェニレン基の場合、nは1~3である。また、A4がシクロヘキシレン基でかつn=0の場合、R2は炭素数1~10のアルキルである。]
また、本発明の液晶化合物を含有する液晶組成物は、小さな粘度および低いしきい値電圧を有する。
また、本発明の液晶組成物を用いることにより、応答性に優れた液晶電気光学素子を得ることができる。
特に、フッ素原子、直鎖状で炭素数1~10のアルキル基、アルコキシ基、フルオロアルキル基またはフルオロアルコキシ基が好ましい。また、フッ素原子、直鎖状で炭素数1~5のアルキル基、アルコキシ基、フルオロアルキル基またはフルオロアルコキシ基がより好ましい。
R11-(A11-Z11)a1-(A21-Z21)b1-A41-(CH2)2-CF=CF-R21 (1-1)
[ただし、式中の記号は以下の意味を示す。
R11:フッ素原子、炭素数1~5のアルキル基、アルコキシ基、フルオロアルキル基またはフルオロアルコキシ基。
R21:フッ素原子または炭素数1~5のアルキル基。
A11、A21およびA41:相互に独立して、フェニレン基またはシクロヘキシレン基。ただしフェニレン基はフッ素原子で置換されていてもよい。
Z11およびZ21:相互に独立して、単結合または炭素数1~4のアルキレン基。
a1およびb1:相互に独立して0または1。ただしa1+b1は1以上。]
C3H7-Cy-Cy-CH2CH2-CF=CF2 (1a-2-1)
C3H7-Cy-Cy-CH2CH2-CF=CF-CH3 (1b-2-1)
C3H7-Cy-Ph-CH2CH2-CF=CF2 (1c-2-1)
C3H7-Cy-Ph-CH2CH2-CF=CF-CH3 (1d-2-1)
CH3-Ph-Ph-CH2CH2-CF=CF2 (1c-2-2)
液晶化合物(1)は、R2がフッ素原子である化合物(化合物(1α))を得る場合は、下記反応式で示すように、化合物(2)をメタル化した後、テトラフルオロエチレンと反応させて化合物(1α)を得ることができる。また、R2がアルキル基である化合物(化合物(1β))を得る場合は、化合物(1α)に化合物(3)のメタル化物を反応させて得ることができる。
↓ +CF2=CF2
R1-(A1-Z1)a-(A2-Z2)b-(A3-Z3)c-A4-(CH2)n-CF=CF2 (1α)
↓ +R2’X (3)
R1-(A1-Z1)a-(A2-Z2)b-(A3-Z3)c-A4-(CH2)n-CF=CF-R2’ (1β)
なお、R2がフッ素原子以外のハロゲン原子、例えば塩素原子である場合は、化合物(2)をメタル化した後、テトラフルオロエチレンではなくクロロトリフルオロエチレン(CF2=CFCl)と反応させることにより、化合物(1)を得ることができる。
化合物(2)および化合物(3)のリチオ化を金属リチウムを用いて実施する場合、電子移動剤を共存させてもよい。電子移動剤としては芳香環が2個以上の化合物または縮合環となっている化合物が使用される。具体的にはナフタレン、ビフェニル、2,6-ジ-tert-ブチルナフタレン、2,7-ジ-tert-ブチルナフタレン、4,4’-ジ-tert-ブチルビフェニルまたはアントラセン等が挙げられるが、好ましくはナフタレン、ビフェニルまたは4,4’-ジ-tert-ブチルビフェニルである。電子移動剤の使用量は、化合物(2)または化合物(3)に対して0.01倍モルから4倍モル、好ましくは0.1倍モルから2.5倍モルである。なお、化合物(2)においてnが0以外、つまりnが2である場合などは、電子移動剤を共存させなくても反応が進みやすい。この場合、生成物の精製が容易になるため好ましい。
リチオ化の際の金属リチウムの使用量は化合物(2)または化合物(3)に対して2倍モルから5倍モル、好ましくは2倍モルから3倍モルである。
↓ 還元
R1-(A1-Z1)a-(A2-Z2)b-(A3-Z3)c-A4-CH2ОH (6)
↓ ハロゲン化
R1-(A1-Z1)a-(A2-Z2)b-(A3-Z3)c-A4-CH2Cl (2-1)
また、本発明の含フッ素液晶化合物(1)は、他の液晶化合物または非液晶性化合物との相溶性に優れ、化学的にも安定であることより、併用される他の液晶化合物等の種類の制約が少なく、目的に応じた様々な液晶組成物へ適用できる。
本発明の液晶組成物は、本発明の含フッ素液晶化合物の1質量%以上と、他の液晶化合物の60質量%以上とを含有する。他の液晶化合物は2種類以上含有していてもよい。本発明の液晶組成物における本発明の含フッ素液晶化合物の含有量が上記範囲未満であると本発明の含フッ素液晶化合物の特徴を充分に発揮しがたい。
前記非液晶性化合物としては、例えば、カイラル剤、色素、安定剤、その他の液晶組成物に配合される種々の機能性化合物等が挙げられる。カイラル剤や色素等のうちには液晶を有する化合物もあり、本発明ではこのような液晶性を有する機能性化合物は液晶に分類する。
なお、本発明における液晶化合物は、単独の化合物として常温で液晶性を示す化合物に限られるものではなく、液晶組成物がある用途に使用された場合にその使用温度下の液晶組成物中において液晶性を示す化合物であればよい。例えば、単独の化合物としては常温で固体であっても、液晶組成物中に溶解されると前記使用温度下で液晶性を示す化合物であってもよい。
また、本発明の含フッ素液晶化合物と他の液晶化合物の合計量は、液晶組成物に対して90質量%以上、特に95質量%以上であることが好ましい。
なお、本発明の含フッ素液晶組成物が本発明の含フッ素液晶化合物の2種以上を含有する場合は、本発明の含フッ素液晶化合物の割合はそれら2種以上の本発明液晶化合物の合計量を表す。
本発明の液晶組成物を構成する他の液晶化合物は、液晶化合物として公知ないし周知である下記液晶化合物から選択することが好ましい。ただし、本発明の液晶組成物における他の液晶化合物はこれらに限られるものではない。
R3-Cy-Ph-R4
R3-Ph-Ph-R4
R3-Ph-C≡C-Ph-R4
R3-Cy-COO-Ph-R4
R3-Ph-COO-Ph-R4
R3-Cy-CH=CH-Ph-R4
R3-Cy-CH2CH2-Ph-R4
R3-Ph-CH2CH2-Ph-R4
R3-Cy-Cy-Ph-R4
R3-Cy-Ph-Ph-R4
R3-Cy-Ph-C≡C-Ph-R4
R3-Ph-Ph-Ph-R4
R3-Cy-Ph-Ph-Cy-R4
R3-Ph-Ph-C≡C-Ph-R4
R3-Cy-COO-Ph-Ph-R4
R3-Cy-Ph-COO-Ph-R4
R3-Cy-COO-Ph-COO-Ph-R4
R3-Ph-COO-Ph-COO-Ph-R4
R3-Ph-COO-Ph-OCO-Ph-R4
本発明は、液晶相の構成材として好適に用いられる液晶電気光学素子を提供する。
本発明の液晶電気光学素子は、本発明の液晶組成物を電極付き基板間に挟持した液晶電気光学素子である。
本発明の液晶電気光学素子は、本発明の液晶組成物を用いること以外は特に限定されず、通常の液晶電気光学素子の構成を採用することができる。
本発明の液晶電気光学素子としては、例えば、本発明の液晶組成物を液晶セル内に注入する等して形成される液晶相を電極を備える2枚の基板間に挟持して構成される電気光学素子部を有する液晶電気光学素子が挙げられる。前記液晶電気光学素子は、TN方式、STN方式、ゲスト・ホスト(GH)方式、動的散乱方式、フェーズチェンジ方式、DAP方式、二周波駆動方式、強誘電性液晶表示方式等種々のモードで駆動されるものが挙げられる。
液晶性化合物と母液晶との割合がこの割合であっても、スメクチック相、または結晶が25℃で析出する場合には、液晶性化合物と母液晶との割合を10質量%:90質量%、5質量%:95質量%の順に変更をしていき、スメクチック相、または結晶が25℃で析出しなくなった組成で試料の物性値を測定し前記式にしたがって外挿値を求めて、これを液晶性化合物の物性値とする。
TC→N<-40℃
TN→I=85℃
γ1=131.5mPa・s
Δε=+7.0
K33/K11=1.27
以下(1)、および(2)の方法で測定を行った。
(1)偏光顕微鏡を備えた融点測定装置のホットプレート(メトラー社FP-82HT型ホットステージ)に試料(化合物そのもの)を置き、1℃/分の速度で加熱しながら相状態とその変化を偏光顕微鏡で観察し、相の種類を特定した。
(2)エスアイアイ・ナノテクノロジー社製示差走査熱量計DSC-6220システムを用いて、1℃/分の速度で昇降温し、試料(化合物そのもの)の相変化に伴う吸熱ピーク、または発熱ピークの開始点を外挿により求め(on set)、転移温度を決定した。
偏光顕微鏡を備えた融点測定装置のホットプレート(メトラー社FP-82HT型ホットステージ)に、試料(液晶化合物と母液晶との混合物)を置き、1℃/分の速度で加熱しながら偏光顕微鏡を観察した。試料の一部が液晶相から等方性液体に変化したときの温度を透明点とした。
測定はM. Imai et al., Molecular Crystals and Liquid Crystals, Vol. 259, 37 (1995) に記載された方法に従った。2枚のガラス基板の間隔(セルギャップ)が8μmのTNセルに試料(液晶化合物と母液晶との混合物)を入れた。この素子に10ボルトから90ボルトの範囲で1ボルト毎に段階的に印加した。0.2秒の無印加のあと、ただ1つの矩形波(矩形パルス;0.2秒)と無印加(2秒)の条件で印加を繰り返した。この印加によって発生した過渡電流(transient current)のピーク電流(peak current)とピーク時間(peak time)を測定した。これらの測定値とM. Imaiらの論文、40頁の計算式(8)とから回転粘度の値を得た。なお、この計算に必要な誘電率異方性は、後述する誘電率異方性の項で測定した値を用いた。
測定は、25℃の温度下で、波長589nmの光を用い、接眼鏡に偏光板を取り付けたアッベ屈折計により行った。主プリズムの表面を一方向にラビングしたあと、試料(液晶化合物と母液晶との混合物)を主プリズムに滴下した。屈折率(n∥)は偏光の方向がラビングの方向と平行であるときに測定した。屈折率(n⊥)は偏光の方向がラビングの方向と垂直であるときに測定した。光学異方性(Δn)の値は、Δn=n∥-n⊥の式から計算した。
測定は、液晶セルの静電容量の印加電圧依存性を測定する方法(静電容量法)にて行った。よく洗浄したガラス基板にポリイミドの配向膜を調製した。得られたガラス基板の配向膜にラビング処理を施し、そのセルに液晶を充填した。液晶の静電容量を印加電圧を変化させて測定した。上述の方法で測定した誘電率異方性を用いて、Freedericksz転移点よりK11を、さらにこの値から、容量変化に対するカーブフィッティングよりK33を計算した。
化合物(2a-1)から化合物(1a-1-1)を合成した。
↓ 1. +Li、DBB、THF
2. +CF2=CF2
C3H7-Cy-Cy-CH2-CF=CF2 (1a-1-1)
アルゴン置換した1Lの四口フラスコに、金属リチウム3.3g、4、4’-ジ-tert-ブチルビフェニル12.5g、THF400mLを加え室温で撹拌した。2時間後、反応液を-10℃に冷却し、公知の方法で合成した化合物(2a-1)40gのTHF溶液40mLを加え、2時間撹拌した。次いで-70℃に冷却した後、反応液中に60%テトラフルオロエチレン/窒素ガス11.0Lを導通し、1時間撹拌した。反応液を徐々に0℃まで昇温し、7.2%塩酸水溶液300mLを加え、ヘキサン200mLで抽出した。ヘキサン溶液を水100mL、重曹水100mL、水100mLの順で洗浄した後、溶媒を留去した。得られた残渣をシリカゲルカラムクロマトグラフィーにより精製し、化合物(1a-1-1)30.4g(収率57%)を得た。
19F-NMR(283MHz,CFCl3)-106.31(dd,J=33.63Hz,91.58Hz,1F),-125.49(dd,J=91.58Hz,112.78Hz,1F),-172.26(ddt,J=24.31Hz,30.53Hz,112.78Hz,1F)
化合物(1a-1-1)から化合物(1b-1-1)を合成した。
↓ +CH3Li、THF
C3H7-Cy-Cy-CH2-CF=CF-CH3 (1b-1-1)
アルゴン置換した300mLの四口フラスコに、化合物(1a-1-1)10.9gのTHF溶液50mLを加え、-10℃に冷却した。次いで1.8Mメチルリチウム溶液60mLを加え、同温で1時間撹拌した後、徐々に室温まで昇温した。反応液に7.2%塩酸水溶液70mLを加え、ヘキサン40mLで抽出した。ヘキサン溶液を水20mL、重曹水20mL、水20mLの順で洗浄した後、溶媒を留去した。得られた残渣をシリカゲルカラムクロマトグラフィーにより精製し、化合物(1b-1-1)6.9g(収率65%)を得た。
19F-NMR(283MHz,CFCl3)-148.41(J=140.37Hz,1F),-153.35(J=128.20Hz,1F)
化合物(2a-2)から化合物(1a-2-1)を合成した。
↓ 1. +Li、DBB、THF
2. +CF2=CF2
C3H7-Cy-Cy-CH2CH2-CF=CF2 (1a-2-1)
実施例1の化合物(2a-1)40gの代わりに化合物(2a-2)40gを用いて、実施例1と同様に反応させて、化合物(1a-2-1)38.0g(収率78%)を得た。
19F-NMR(283MHz,CFCl3)-106.75(J=92.82Hz,1F),-125.83(J=113.20Hz,1F),-174.84(J=113.20Hz,1F)
化合物(1a-2-1)から化合物(1b-2-1)を合成した。
↓ +CH3Li、THF
C3H7-Cy-Cy-CH2CH2-CF=CF-CH3 (1b-2-1)
実施例1の化合物(1a-1-1)10.9gの代わりに化合物(1a-2-1)11.5gを用いて、実施例2と同様に反応させて、化合物(1b-2-1)8.2g(収率74%)を得た。
19F-NMR(283MHz,CFCl3)-149.15(J=140.37Hz,1F),-156.10(J=119.14Hz,1F)
化合物(7)から化合物(1b-0-1)を合成した。
↓ +CH3Li、THF
C3H7-Cy-Cy-CF=CF-CH3 (1b-0-1)
実施例1の化合物(1a-1-1)10.9gの代わりに、化合物(7)10.4gを用いて、実施例2と同様に反応させて、化合物(1b-0-1)6.9g(収率68%)を得た。
19F-NMR(283MHz,CFCl3)-150.05(J=119.04Hz,1F),-165.57(J=121.97Hz,1F)
実施例1~5に記載された合成方法と同様の方法により、表1~表7に示す化合物を合成することができる。なお、前記化合物群には、実施例1~5で得られる化合物についても記載している。付記したデータは前記した手法に従い、測定した値である。転移温度は化合物自体の測定値であり、透明点(Tc)、屈折率異方性(Δn)の値は、化合物を母液晶ZLI-1565に混合した試料の測定値を、上記外挿法に従って換算した外挿値である。
なお、表1~表7において、「B」は、化合物(1)における、「-(A1-Z1)a-(A2-Z2)b-(A3-Z3)c-」を意味する。また、表1~表7において、Cyは、1,4-シクロヘキシレン基を意味し、Phは、1,4-フェニレン基を意味する。
メルク社製液晶組成物「ZLI-1565」90モル%(89質量%)、および前記本発明の化合物(1a―1-1)10モル%(11質量%)の割合で混合し、液晶組成物を調整した。この液晶組成物を液晶組成物Aとする。
メルク社製液晶組成物「ZLI-1565」90モル%(89質量%)、および前記本発明の化合物(1a-2-1)10モル%(11質量%)の割合で混合し、液晶組成物を調整した。この液晶組成物を液晶組成物Bとする。
メルク社製液晶組成物「ZLI-1565」90モル%(89質量%)、および前記本発明の化合物(1b-2-1)10モル%(11質量%)の割合で混合し、液晶組成物を調整した。この液晶組成物を液晶組成物Cとする。
メルク社製液晶組成物「ZLI-1565」90モル%(90質量%)、および前記本発明の化合物(1c-2-1)10モル%(10質量%)の割合で混合し、液晶組成物を調整した。この液晶組成物を液晶組成物Dとする。
メルク社製液晶組成物「ZLI-1565」のみを、液晶組成物Eとする。
メルク社製液晶組成物「ZLI-1565」90モル%(89質量%)、および前記本発明の化合物(1b―1-2)10モル%(11質量%)の割合で混合し、液晶組成物を調整した。この液晶組成物を液晶組成物Fとする。
メルク社製液晶組成物「ZLI-1565」90モル%(89質量%)、および前記本発明の化合物(1b-0-2)10モル%(11質量%)の割合で混合し、液晶組成物を調整した。この液晶組成物を液晶組成物Gとする。
メルク社製液晶組成物「ZLI-1565」90モル%(89質量%)、および前記本発明の化合物(1a-2-1)10モル%(11質量%)の割合で混合し、液晶組成物を調整した。この液晶組成物を液晶組成物Hとする。
メルク社製液晶組成物「ZLI-1565」90モル%(89質量%)、および前記本発明の化合物(1b-0-3)10モル%(11質量%)の割合で混合し、液晶組成物を調整した。この液晶組成物を液晶組成物Iとする。
メルク社製液晶組成物「ZLI-1565」のみを、液晶組成物Jとする。
本発明の化合物(1a-2-1)および化合物(1b-2-1)の、相系列、液晶温度範囲(相系列から計算したもの)および透明点(Tc)を表10に示す。
実施例5において、化合物(1b-0-1)の合成原料として用いた化合物(7)について、実施例6と同じ条件で測定、計算して求めた相系列、透明点(Tc)および液晶温度範囲を表10に示す。なお、該化合物(7)(2-[トランス-4-(トランス-4-プロピルシクロヘキシル)シクロヘキシル]-1,1,2-トリフルオロエチレン)は、特許文献3に化合物(2)として記載される。
Claims (8)
- 下記式(1)で表される含フッ素液晶化合物。
R1-(A1-Z1)a-(A2-Z2)b-(A3-Z3)c-A4-(CH2)n-CF=CF-R2 (1)
[ただし、式(1)中の記号は、以下の意味を示す。
R1:水素原子、ハロゲン原子または炭素数1~10のアルキル基。
R2:ハロゲン原子または炭素数1~10のアルキル基。ただし、R1およびR2におけるアルキル基中の一つ以上の水素原子がハロゲン原子で置換されていてもよく、該アルキル基中の炭素-炭素原子間または該アルキル基の結合末端に、エーテル性酸素原子またはチオエーテル性硫黄原子が挿入されていてもよい。
A1、A2、A3およびA4:相互に独立して、フェニレン基またはシクロヘキシレン基。ただし、A1、A2、A3およびA4の基中の一つ以上の水素原子がハロゲン原子で置換されていてもよく、該基中に存在する一つまたは二つの-CH=が窒素原子で置換されていてもよく、該基中に存在する一つまたは二つの-CH2-がエーテル性酸素原子またはチオエーテル性硫黄原子で置換されていてもよい。
Z1、Z2およびZ3:相互に独立して、単結合、-O-、-S-または炭素数1~4の二価の脂肪族炭化水素基。ただし、該脂肪族炭化水素基中の一つ以上の水素原子がハロゲン原子で置換されていてもよく、該脂肪族炭化水素基中の炭素-炭素原子間または該脂肪族炭化水素基の結合末端に、エーテル性酸素原子またはチオエーテル性硫黄原子が挿入されていてもよい。
a、bおよびc:相互に独立して0または1。ただし、a+b+cは1以上。
n:0~3の整数。ただし、A4がフェニレン基の場合、nは1~3であり、A4がシクロヘキシレン基でかつn=0の場合、R2は炭素数1~10のアルキル基である。] - 式(1)で表される化合物において、R1がフッ素原子、炭素数1~5のアルキル基、アルコキシ基、フルオロアルキル基またはフルオロアルコキシ基であり、R2がフッ素原子、炭素数1~5のアルキル基である請求項1に記載の含フッ素液晶化合物。
- 式(1)で表される化合物において、A1、A2、A3およびA4が相互に独立して、1,4-シクロヘキシレン基または1,4-フェニレン基であり、該1,4-フェニレン基中に存在する水素原子の一つ以上がフッ素原子で置換されていてもよい、請求項1または2に記載の含フッ素液晶化合物。
- 式(1)で表される化合物において、n=0または2である請求項1~3のいずれかに記載の含フッ素液晶化合物。
- 式(1)で表される化合物において、nが2であり、かつ、R2がフッ素原子または炭素数1~5のアルキル基である、請求項1~4のいずれかに記載の含フッ素液晶化合物。
- 式(1)で表される化合物において、a+b+cが2以下である請求項1~5のいずれかに記載の含フッ素液晶化合物。
- 請求項1~6のいずれかに記載の含フッ素液晶化合物を含有する液晶組成物。
- 請求項7に記載の液晶組成物を電極付き基板間に挟持した液晶電気光学素子。
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US13/142,148 US8574455B2 (en) | 2008-12-24 | 2009-12-22 | Fluorine-containing liquid crystal compound, liquid crystal composition, and liquid crystal electro-optic element |
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CN102031120A (zh) * | 2010-11-17 | 2011-04-27 | 上海天问化学有限公司 | 4-(2,3,5,6-四氟-r取代基苯乙基)苯甲酸-4’-氟-4-联苯酯的含氟液晶 |
JP2014122172A (ja) * | 2012-12-20 | 2014-07-03 | Agc Seimi Chemical Co Ltd | −cf=cf2末端基を有する液晶化合物の製造方法 |
JP2016147852A (ja) * | 2015-01-30 | 2016-08-18 | 達興材料股▲ふん▼有限公司 | 液晶化合物およびそれを用いる液晶組成物 |
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JP2014122172A (ja) * | 2012-12-20 | 2014-07-03 | Agc Seimi Chemical Co Ltd | −cf=cf2末端基を有する液晶化合物の製造方法 |
JP2016147852A (ja) * | 2015-01-30 | 2016-08-18 | 達興材料股▲ふん▼有限公司 | 液晶化合物およびそれを用いる液晶組成物 |
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