WO2014156947A1 - ネマチック液晶組成物及びこれを用いた液晶表示素子 - Google Patents
ネマチック液晶組成物及びこれを用いた液晶表示素子 Download PDFInfo
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- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/34—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring
- C09K19/3402—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having oxygen as hetero atom
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- C09K19/00—Liquid crystal materials
- C09K19/02—Liquid crystal materials characterised by optical, electrical or physical properties of the components, in general
- C09K19/0208—Twisted Nematic (T.N.); Super Twisted Nematic (S.T.N.); Optical Mode Interference (O.M.I.)
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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
- C09K19/10—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
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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
- C09K19/3066—Cyclohexane rings in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers
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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
- C09K19/32—Non-steroidal liquid crystal compounds containing condensed ring systems, i.e. fused, bridged or spiro ring systems
- C09K19/322—Compounds containing a naphthalene ring or a completely or partially hydrogenated naphthalene ring
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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
- C09K2019/0466—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
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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)
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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
- C09K19/34—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring
- C09K19/3402—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having oxygen as hetero atom
- C09K2019/3422—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having oxygen as hetero atom the heterocyclic ring being a six-membered ring
Definitions
- the present invention relates to a nematic liquid crystal composition having a positive dielectric anisotropy ( ⁇ ) useful as a liquid crystal display material, and a liquid crystal display device using the same.
- Liquid crystal display elements are used in various measuring instruments, automobile panels, word processors, electronic notebooks, printers, computers, televisions, watches, advertisement display boards, etc., including clocks and calculators.
- Typical liquid crystal display methods include TN (twisted nematic) type, STN (super twisted nematic) type, vertical alignment type using TFT (thin film transistor), and IPS (in-plane switching) type.
- the liquid crystal composition used in these liquid crystal display elements is stable against external stimuli such as moisture, air, heat, light, etc., and exhibits a liquid crystal phase in the widest possible temperature range centering on room temperature. And a low driving voltage is required.
- the liquid crystal composition is composed of several to several tens of kinds of compounds in order to optimize the dielectric anisotropy ( ⁇ ) or the refractive index anisotropy ( ⁇ n) for each display element. .
- a liquid crystal composition having a negative ⁇ is used, and in a horizontal alignment type display such as a TN type, STN type, or IPS (in-plane switching) type, a liquid crystal composition having a positive ⁇ . Is used.
- a driving method has been reported in which a liquid crystal composition having a positive ⁇ is vertically aligned when no voltage is applied and a lateral electric field is applied to display the liquid crystal composition. Yes.
- low voltage driving, high-speed response, and a wide operating temperature range are required in all driving systems.
- ⁇ is positive, the absolute value is large, the viscosity ( ⁇ ) is small, and a high nematic phase-isotropic liquid phase transition temperature (Tni) is required.
- Tni nematic phase-isotropic liquid phase transition temperature
- Examples of the structure of the liquid crystal composition aimed at high-speed response include, for example, a compound represented by the formula (A-1) or (A-2) in which ⁇ is a positive liquid crystal compound, and a liquid crystal compound in which ⁇ is neutral.
- a liquid crystal composition using a combination of (B) is disclosed.
- the characteristics of these liquid crystal compositions are widely known in the field of liquid crystal compositions that a liquid crystal compound having a positive ⁇ has a —CF 2 O— structure and that a liquid crystal compound having a negative ⁇ has an alkenyl group. It has been. (Patent Documents 1 to 4)
- liquid crystal display elements using a liquid crystal composition are widely used, such as VA type and IPS type, and super large size display elements having a size of 50 type or more are practically used. Became.
- the injection method of liquid crystal composition into the substrate became the main method of injection from the conventional vacuum injection method (ODF: One : Drop Fill), but the liquid crystal composition was applied to the substrate. The problem that the drop marks when dropped causes the display quality to deteriorate is brought to the surface.
- liquid crystal composition used for the active matrix drive liquid crystal display element driven by a TFT element or the like while maintaining the characteristics and performance required for a liquid crystal display element such as high-speed response performance, in addition to the characteristics of having a high specific resistance value or high voltage holding ratio, which are emphasized, and being stable against external stimuli such as light and heat, development in consideration of the manufacturing method of liquid crystal display elements has been required. ing.
- the problem to be solved by the present invention is a liquid crystal composition having a positive dielectric anisotropy ( ⁇ ), having a liquid crystal phase in a wide temperature range, low viscosity, and good solubility at low temperatures.
- ⁇ positive dielectric anisotropy
- the present inventors have studied various liquid crystal compounds and various chemical substances, and found that the above problems can be solved by combining specific liquid crystal compounds, and have completed the present invention.
- the liquid crystal composition of the present invention has the formula (Ix) as the first component.
- liquid crystal composition containing a component (A) having a positive dielectric anisotropy ( ⁇ ) as the second component, the content of which is 3 to 60% by mass.
- a liquid crystal display element using the same is provided.
- the liquid crystal composition having a positive dielectric anisotropy ( ⁇ ) of the present invention can obtain very low viscosity ( ⁇ ) and rotational viscosity ( ⁇ 1), has good solubility at low temperature, and has a specific resistance. And the voltage holding ratio (VHR) undergoes very little change due to heat or light, so that it is highly practical, and liquid crystal display elements such as TN type, IPS type, and FFS type can achieve high-speed response. In addition, since the performance can be stably exhibited in the liquid crystal display element manufacturing process, display defects due to the process can be suppressed and the manufacturing can be performed with a high yield, which is very useful.
- VHR voltage holding ratio
- the present inventor has studied various bicyclohexyl derivatives, fluorobenzene derivatives and fluoronaphthalene derivatives, and found that the above problems can be solved by combining specific compounds, and has completed the present invention.
- the liquid crystal composition of the present invention contains a compound represented by the formula (Ix) as a first component.
- the compound represented by the formula (Ix) is contained in an amount of 3 to 60% by mass, preferably 5 to 50% by mass, more preferably 5 to 40% by mass, and more preferably 10 to 30% by mass. Is particularly preferred. More specifically, when the viscosity ( ⁇ ) or rotational viscosity ( ⁇ 1) is reduced, the content is preferably 20 to 60% by mass, but when importance is placed on the suppression of precipitation at low temperatures, the content is 10 to 30% by weight is preferred. When it is desired to ensure solubility at low temperatures, the content is preferably 10 to 40% by mass.
- the liquid crystal composition of the present invention contains a compound having a positive dielectric anisotropy ( ⁇ ) as the second component.
- positive dielectric anisotropy ( ⁇ ) means that the absolute value of dielectric anisotropy ( ⁇ ) is larger than 2.
- the content of component (A) in which ⁇ is positive is preferably 10 to 90% by mass, more preferably 15 to 70% by mass, and particularly preferably 15 to 50% by mass.
- the compound used for component (A) is composed of a compound having a dielectric anisotropy ( ⁇ ) of 2 or more, preferably 2.5 or more, and composed of 3 or more compounds. More preferably, it is particularly preferably composed of 3.5 or more compounds. Note that the dielectric anisotropy ( ⁇ ) of the compound was added to a liquid crystal composition having a dielectric anisotropy ( ⁇ ) of about 0 at 25 ° C. It is a value extrapolated from the measured value.
- the component (A) as the second component preferably contains a compound represented by the general formula (Na) or the general formula (Nb) having a naphthalene skeleton.
- each of R Na1 and R Nb1 independently represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, and one or non-adjacent two or more adjacent groups in the group
- Each of —CH 2 — may be independently substituted by —C ⁇ C—, —O—, —CO—, —COO— or —OCO—, but an alkyl group having 1 to 5 carbon atoms or An alkenyl group having 2 to 5 carbon atoms is preferred.
- Ring A Na1 and A Nb1 are each independently a 1,4-cyclohexylene group (one or two or more non-adjacent —CH 2 — in the group is substituted by —O— or —S—). Or a 1,4-phenylene group (one in the group or two or more non-adjacent —CH ⁇ may be substituted by —N ⁇ ), and a hydrogen atom in the group Each independently may be substituted with a cyano group, a fluorine atom or a chlorine atom, but may be a 1,4-cyclohexylene group, a tetrahydropyran-2,5-diyl group, a 1,4-phenylene group, or a 3-fluoro group. A 1,4-phenylene group or a 3,5-difluoro-1,4-phenylene group is preferred.
- Z Na1 , Z Nb1 and Z Nb2 are each independently a single bond, —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, — CF 2 O—, —COO—, —OCO— or —C ⁇ C— is represented, and a single bond, —CH 2 CH 2 —, —CH 2 O— or —CF 2 O— is more preferable.
- n Na1 represents 1, 2, 3 or 4, but when n Na1 is 2, 3 or 4 and a plurality of ring A Na1 are present, they may be the same or different, and similarly When there are a plurality of Z Na1 , they may be the same or different.
- N Na1 2, 3 or 4 are preferred in the case of emphasizing improvements Tni, when emphasizing improved response speed n Na1 is 1 or 2 are preferred.
- n Nb1 represents 0, 1, 2 or 3, but when n Nb1 is 2, 3 or 4 and a plurality of ring A Nb1 are present, they may be the same or different, and similarly , Z Nb1 may be the same or different.
- n Nb1 is 1, 2 or 3 in the case of emphasizing improvements Tni, when emphasizing improved response speed n Nb1 is 0 or 1 is preferred.
- X Na1, X Na2, X Na3 , X Nb1, X Nb2, X Nb3, X Nb4 and X Nb5 are, each independently, represent a hydrogen atom, a chlorine atom or a fluorine atom.
- X Na1 preferably represents a hydrogen atom, and at least one of X Na2 and X Na3 preferably represents a fluorine atom, and more preferably represents both a fluorine atom.
- X Nb1 preferably represents a hydrogen atom, and at least one of X Nb2 and X Nb3 preferably represents a fluorine atom, and more preferably represents both a fluorine atom.
- At least one of X Nb4 and X Nb5 is preferably represent a fluorine atom, and more preferably both represent fluorine atoms.
- Y Na1 and Y Nb1 each independently represent a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. It is preferably a fluorine atom, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group or a trifluoromethoxy group, and more preferably a fluorine atom, a trifluoromethyl group or a trifluoromethoxy group.
- the component (A) which is the second component preferably contains a compound represented by the general formula (Pa).
- R Nc1 represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, and one or two or more non-adjacent —CH 2 — in the group are each independently , —C ⁇ C—, —O—, —CO—, —COO— or —OCO—, but may be substituted with an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms Is preferred.
- Rings P 1 , P 2 and P 3 are each independently a 1,4-cyclohexylene group (one or two or more non-adjacent —CH 2 — in the group is replaced by —O— or —S—).
- a 1,4-phenylene group (one or two or more non-adjacent —CH ⁇ may be substituted with —N ⁇ ) in the group
- Each hydrogen atom may be independently substituted with a cyano group, a fluorine atom or a chlorine atom, but a 1,4-cyclohexylene group, a tetrahydropyran-2,5-diyl group, a 1,4-phenylene group, 3
- a -fluoro-1,4-phenylene group or a 3,5-difluoro-1,4-phenylene group is preferred.
- Z Nc1 , Z Nc2 or Z Nc3 each independently represents a single bond, —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, — CF 2 O—, —COO—, —OCO— or —C ⁇ C— represents a single bond, —CH 2 CH 2 —, —CH 2 O— or —CF 2 O—, and present Z nc1, one of of the Z Nc2 or Z Nc3 it is more preferably a single bond.
- n c1 , n c2 and n c3 each independently represent 0, 1 or 2.
- n c1 + n c2 + n c3 represents 1 to 5, more preferably 4 or less, and particularly preferably 3 or less.
- X Nc1 and X Nc2 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom.
- Y Nc1 represents a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group.
- a methyl group, a fluoromethoxy group, a difluoromethoxy group or a trifluoromethoxy group is preferred, and a fluorine atom, a trifluoromethyl group or a trifluoromethoxy group is more preferred.
- the compound represented by the general formula (Na) is preferably a compound selected from the group of compounds represented by the general formulas (Na01) to (Na12).
- R Na1 represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, and one or two or more non-adjacent —CH 2 — in the group are each independently , —C ⁇ C—, —O—, —CO—, —COO— or —OCO—, but may be substituted with an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms Is preferred.
- Z Na1 and Z Na2 are each independently a single bond, —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, —CF 2 O —, —COO—, —OCO— or —C ⁇ C— is represented, and a single bond, —CH 2 CH 2 —, —CH 2 O— or —CF 2 O— is more preferable.
- X Na1 to X Na5 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom.
- Y Na1 represents a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group or a 2,2,2-trifluoroethyl group.
- a methyl group, a fluoromethoxy group, a difluoromethoxy group or a trifluoromethoxy group is preferred, and a fluorine atom, a trifluoromethyl group or a trifluoromethoxy group is more preferred.
- the compound represented by the general formula (Nb) is preferably a compound selected from the group of compounds represented by the general formulas (Nb1) to (Nb16).
- R Nb1 represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, and one or two or more non-adjacent —CH 2 — in the group are each independently , —C ⁇ C—, —O—, —CO—, —COO— or —OCO—, but may be substituted with an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms Is preferred.
- X Nb1 to X Nb5 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom.
- Y Nb1 represents a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group.
- a methyl group, a fluoromethoxy group, a difluoromethoxy group or a trifluoromethoxy group is preferred, and a fluorine atom, a trifluoromethyl group or a trifluoromethoxy group is more preferred.
- the compound represented by the general formula (Pa) is preferably a compound selected from the group of compounds represented by the general formulas (P01) to (P80).
- R Nc1 represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, and one or two or more non-adjacent —CH 2 — in the group are each independently , —C ⁇ C—, —O—, —CO—, —COO— or —OCO—, but may be substituted with an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms Is preferred.
- Y Nc2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group, , A trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group or a trifluoromethoxy group, and more preferably a fluorine atom, a trifluoromethyl group or a trifluoromethoxy group.
- the liquid crystal composition of the present invention can contain a compound having a dielectric anisotropy ( ⁇ ) of almost 0 as a third component. Specifically, it is preferable to contain one or more compounds selected from the compound group represented by formulas (III-A) to (III-J).
- R 5 is an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms
- R 6 is an alkyl group having 1 to 5 carbon atoms
- an alkoxyl group having 1 to 5 carbon atoms Represents an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms.
- the compound represented by the general formula (III-A) does not include the same compound as the compound represented by the formula (Ix).
- a compound having a dielectric anisotropy ( ⁇ ) as the third component of approximately 0 is represented by the general formula (III-A), general formula (III-D), general formula (III-F), general formula (III- More preferred are compounds selected from G) and general formula (III-H).
- R 5 represents an alkyl group having 1 to 5 carbon atoms or 2 carbon atoms.
- R 6 is preferably an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms.
- R 5 and R 6 are preferably each independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.
- the content of the compound having a dielectric anisotropy ( ⁇ ) as the third component of approximately 0 is preferably 10 to 80% by mass, and more preferably 10 to 60% by mass. 20 to 50% by weight is particularly preferred.
- one or more compounds represented by general formula (VIII-c) or general formula (VIII-d) may be contained.
- each of R 51 and R 52 independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or 2 to 2 carbon atoms.
- 5 represents an alkenyloxy group
- X 51 and X 52 each independently represent a fluorine atom, a chlorine atom or a hydrogen atom.
- the liquid crystal composition of the present invention can contain a polymerizable compound in order to produce a liquid crystal display element such as a PS mode, a transverse electric field type PSA mode, or a transverse electric field type PSVA mode.
- a polymerizable compound such as a PS mode, a transverse electric field type PSA mode, or a transverse electric field type PSVA mode.
- the polymerizable compound that can be used include a photopolymerizable monomer having a liquid crystal skeleton in which a plurality of six-membered rings such as a biphenyl derivative and a terphenyl derivative are polymerized by energy rays such as light.
- the bifunctional monomer represented by the general formula (XX) is preferable.
- X 201 and X 202 each independently represent a hydrogen atom or a methyl group.
- Sp 201 and Sp 202 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O— (CH 2 ) s — (wherein s represents an integer of 2 to 7, Represents an aromatic ring).
- M 201 represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond, and all of the 1,4-phenylene groups in the formula have an arbitrary hydrogen atom substituted by a fluorine atom. Also good. ).
- X 201 and X 202 are each preferably a diacrylate derivative that represents a hydrogen atom, or a dimethacrylate derivative that has a methyl group, and a compound in which one represents a hydrogen atom and the other represents a methyl group.
- diacrylate derivatives are the fastest, dimethacrylate derivatives are slow, asymmetric compounds are in the middle, and a preferred embodiment can be used depending on the application.
- a dimethacrylate derivative is particularly preferable.
- Sp 201 and Sp 202 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O— (CH 2 ) s —, but a PS type display element and a lateral electric field type PSA mode liquid crystal
- the display element it is preferable that at least one of them is a single bond, a compound that represents a single bond, or one of which is a single bond and the other is an alkylene group having 1 to 8 carbon atoms or —O— (CH 2 ) s —.
- 1 to 4 alkylene groups are preferable, and s is preferably 1 to 4.
- Z 201 represents —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 — or a single bond
- —COO—, —OCO— or a single bond is more preferred, and a single bond is particularly preferred.
- M 201 represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond in which any hydrogen atom may be substituted by a fluorine atom, but a 1,4-phenylene group or a single bond Is preferred.
- the ring structure between Sp 201 and Sp 202 is preferably from formula (XXa-1) to formula (XXa-5), and from formula (XXa-1)
- the formula (XXa-3) is more preferable, and the formula (XXa-1) is particularly preferable.
- both ends of the equation shall be connected to Sp 201 or Sp 202 .
- Polymerizable compounds containing these skeletons are ideal for PS-type display elements and lateral electric field-type PSA mode liquid crystal display elements because of the ability to regulate alignment after polymerization, and display alignment is suppressed because a good alignment state is obtained. There is an effect that does not occur at all.
- a compound represented by the formula (XX-1), the formula (XX-2), the general formula (XX-3) or the general formula (XX-4) is particularly preferable.
- (XX-2) is most preferred.
- Sp 20 represents an alkylene group having 1 to 4 carbon atoms.
- the polymerization proceeds even when no polymerization initiator is present, but may contain a polymerization initiator in order to accelerate the polymerization.
- the polymerization initiator include benzoin ethers, benzophenones, acetophenones, benzyl ketals, acylphosphine oxides, and the like.
- the liquid crystal composition in the present invention can further contain a compound represented by the general formula (Q).
- R Q represents a linear or branched alkyl group having 1 to 22 carbon atoms, and one or two or more non-adjacent CH 2 groups in the group are —O—, —CH ⁇ CH—, —CO—, —OCO—, —COO—, —C ⁇ C—, —CF 2 O—, —OCF 2 — may be substituted.
- MQ represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group or a single bond.
- the compound represented by the general formula (Q) is preferably a compound represented by the following general formula (Qa) to general formula (Qd).
- R Q1 is preferably a linear alkyl group or a branched alkyl group having 1 to 10 carbon atoms.
- R Q2 is preferably a linear alkyl group having 1 to 20 carbon atoms or a branched alkyl group.
- R Q3 is preferably a linear alkyl group having 1 to 8 carbon atoms, a branched alkyl group, a linear alkoxy group, or a branched alkoxy group.
- L Q is preferably a linear alkylene group having 1 to 8 carbon atoms or a branched alkylene group.
- the compound represented by formula (Q) preferably contains one or two compounds, more preferably contains 1 to 5 compounds, and the content is 0.001. Is preferably 1 to 1% by mass, more preferably 0.001 to 0.1% by mass, and particularly preferably 0.001 to 0.05% by mass.
- the liquid crystal composition of the present invention has a dielectric anisotropy ( ⁇ ) at 25 ° C. of 2.0 to 20.0, preferably 4.0 to 18.0, and more preferably 4.0 to 16.0. 4.0 to 14.0 are preferred and particularly preferred.
- the liquid crystal composition of the present invention has a refractive index anisotropy ( ⁇ n) at 20 ° C. of 0.08 to 0.18, more preferably 0.09 to 0.15, and 0.09 to 0.12. Particularly preferred. More specifically, it is preferably 0.10 to 0.18 when dealing with a thin cell gap, and preferably 0.08 to 0.10 when dealing with a thick cell gap.
- the liquid crystal composition of the present invention has a viscosity ( ⁇ ) at 20 ° C. of 10 to 30 mPa ⁇ s, more preferably 10 to 25 mPa ⁇ s, and particularly preferably 10 to 20 mPa ⁇ s.
- the liquid crystal composition of the present invention has a rotational viscosity ( ⁇ 1 ) at 20 ° C. of 50 to 130 mPa ⁇ s, more preferably 50 to 110 mPa ⁇ s, and particularly preferably 50 to 90 mPa ⁇ s. .
- the liquid crystal composition of the present invention has a nematic phase-isotropic liquid phase transition temperature (T ni ) of 60 ° C. to 120 ° C., more preferably 70 ° C. to 110 ° C., and particularly preferably 70 ° C. to 100 ° C.
- T ni nematic phase-isotropic liquid phase transition temperature
- the measured characteristics are as follows.
- T ni Nematic phase-isotropic liquid phase transition temperature (° C.)
- T cn Solid phase-nematic phase transition temperature (° C)
- ⁇ n Refractive index anisotropy at 20 ° C.
- Viscosity at 20 ° C. (mPa ⁇ s) ⁇ 1 rotational viscosity at 20 ° C. (mPa ⁇ s) ⁇ : dielectric anisotropy at 25 ° C.
- LC-A Comparative Example 1
- LC-1 Example 1
- LC-2 Example 2
- LC-3 Example 3
- the liquid crystal compositions LC-1, LC-2 and LC-3 of the present invention had lower viscosity ( ⁇ ) and lower rotational viscosity ( ⁇ 1 ) than LC-A as a comparative example. Further, Tcn was remarkably low, and it was confirmed that the solubility at low temperature was remarkably improved.
- LC-1, LC-2 and LC-3 had sufficiently high-speed responses, and were 10% or more faster than LC-A. Furthermore, VHR was measured and it confirmed that it was sufficiently high VHR.
- the cell thickness was 4 ⁇ m
- the alignment film was AL1051
- the response speed measurement conditions were Von 5.5 V, Voff 1.0 V, measurement temperature 20 ° C., and DMS301 manufactured by AUTRONIC-MELCHERS was used.
- the measurement conditions for VHR were 5 V, 60 Hz, the measurement temperature was 60 ° C., and LCM-2 manufactured by Toyo Corporation was used.
- the liquid crystal compositions LC-4 and LC-5 of the present invention had lower viscosity ( ⁇ ) and lower rotational viscosity ( ⁇ 1 ) than LC-B as a comparative example. Moreover, Tcn became low and it confirmed that the solubility in low temperature was improved.
- LC-4 and LC-5 had sufficiently high-speed response, and 10% or more faster than LC-B.
- VHR was measured and it confirmed that it was sufficiently high VHR.
- the cell thickness was 4 ⁇ m
- the alignment film was AL1051
- the response speed measurement conditions were Von 5.5 V, Voff 1.0 V, measurement temperature 20 ° C.
- DMS301 manufactured by AUTRONIC-MELCHERS was used.
- the measurement conditions for VHR were 5 V, 60 Hz, the measurement temperature was 60 ° C., and LCM-2 manufactured by Toyo Corporation was used. Moreover, when the specific resistance was measured, it was 1.0E + 14 ( ⁇ ⁇ cm) or more, and it was confirmed that the specific resistance was sufficiently high.
- the specific resistance was measured using a specific resistance measuring device MMAII-17 manufactured by Kawaguchi Electric Co., Ltd. (Comparative Example 3, Example 6 and Example 7) LC-C (Comparative Example 3), LC-6 (Example 6) and LC-7 (Example 7) liquid crystal compositions were prepared and their physical properties were measured. The composition of the liquid crystal composition and the results of its physical property values are shown in Table 3.
- the liquid crystal compositions LC-6 and LC-7 of the present invention had lower viscosity ( ⁇ ) and lower rotational viscosity ( ⁇ 1 ) than LC-C as a comparative example. Further, Tcn was remarkably low, and it was confirmed that the solubility at low temperature was remarkably improved. When the response speed of the liquid crystal display element using these was measured, LC-6 and LC-7 had sufficiently high-speed response, and were 10% or more faster than LC-C. Furthermore, VHR was measured and it confirmed that it was sufficiently high VHR.
- the cell thickness was 4 ⁇ m
- the alignment film was AL1051
- the response speed measurement conditions were Von 5.5 V, Voff 1.0 V, measurement temperature 20 ° C.
- DMS301 manufactured by AUTRONIC-MELCHERS was used.
- the measurement conditions for VHR were 5 V, 60 Hz
- the measurement temperature was 60 ° C.
- LCM-2 manufactured by Toyo Corporation was used.
- the specific resistance was measured, it was 1.0E + 14 ( ⁇ ⁇ cm) or more, and it was confirmed that the specific resistance was sufficiently high.
- the specific resistance was measured using a specific resistance measuring device MMAII-17 manufactured by Kawaguchi Electric Co., Ltd.
- the liquid crystal compositions LC-8, LC-9 and LC-10 of the present invention had a lower viscosity ( ⁇ ) and a significantly lower Tcn than LC-D as a comparative example.
- LC-8, LC-9, and LC-10 had sufficiently high-speed response, and were 10% or more faster than LC-D.
- VHR was measured and it confirmed that it was sufficiently high VHR.
- the cell thickness was 4 ⁇ m
- the alignment film was AL1051
- the response speed measurement conditions were Von 5.5 V, Voff 1.0 V, measurement temperature 20 ° C.
- DMS301 manufactured by AUTRONIC-MELCHERS was used.
- the measurement conditions for VHR were 5 V, 60 Hz, the measurement temperature was 60 ° C., and LCM-2 manufactured by Toyo Corporation was used. Moreover, when the specific resistance was measured, it was 1.0E + 14 ( ⁇ ⁇ cm) or more, and it was confirmed that the specific resistance was sufficiently high.
- the specific resistance was measured using a specific resistance measuring device MMAII-17 manufactured by Kawaguchi Electric Co., Ltd.
- the liquid crystal composition of the present invention has a sufficiently small viscosity ( ⁇ ) without lowering the refractive index anisotropy ( ⁇ n) and the nematic phase-isotropic liquid phase transition temperature (T ni ).
- the liquid crystal display element using P-type TFT, IPS, etc. using this has no or no display defect because it has negative dielectric anisotropy ( ⁇ ) with sufficiently small rotational viscosity ( ⁇ 1) and large absolute value. It was confirmed that the display quality was excellent and the response speed was fast.
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Abstract
Description
環P1、P2及びP3はそれぞれ独立的に、1,4-シクロヘキシレン基(基中の1個又は非隣接の2個以上の-CH2-は-O-又は-S-によって置換されていても良い。)又は1,4-フェニレン基(基中の1個又は非隣接の2個以上の-CH=は-N=に置換されていても良い。)を表し、基中の水素原子はそれぞれ独立的にシアノ基、フッ素原子又は塩素原子で置換されていても良いが、1,4-シクロヘキシレン基、テトラヒドロピラン-2,5-ジイル基、1,4-フェニレン基、3-フルオロ-1,4-フェニレン基又は3,5-ジフルオロ-1,4-フェニレン基が好ましい。
(側鎖)
-F -F フッ素原子
F- -F フッ素原子
-n -CnH2n+1 炭素数nの直鎖状のアルキル基
n- CnH2n+1- 炭素数nの直鎖状のアルキル基
-On -OCnH2n+1 炭素数nの直鎖状のアルコキシル基
nO- CnH2n+1O- 炭素数nの直鎖状のアルコキシル基
-V -CH=CH2
V- CH2=CH-
-V1 -CH=CH-CH3
1V- CH3-CH=CH-
-2V -CH2-CH2-CH=CH3
V2- CH3=CH-CH2-CH2-
-2V1 -CH2-CH2-CH=CH-CH3
1V2- CH3-CH=CH-CH2-CH2
(環構造)
Tcn :固体相-ネマチック相転移温度(℃)
Δn :20℃における屈折率異方性
η :20℃における粘度(mPa・s)
γ1 :20℃における回転粘性(mPa・s)
Δε :25℃における誘電率異方性
(比較例1、実施例1、実施例2及び実施例3)
LC-A(比較例1)、LC-1(実施例1)、LC-2(実施例2)及びLC-3(実施例3)の液晶組成物を調製し、その物性値を測定した。液晶組成物の構成とその物性値の結果は表1のとおりであった。
(比較例2、実施例4及び実施例5)
LC-B(比較例2)、LC-4(実施例4)及びLC-5(実施例5)の液晶組成物を調製し、その物性値を測定した。液晶組成物の構成とその物性値の結果は表2のとおりであった。
これらを使用した液晶表示素子の応答速度を測定したところ、LC-4及びLC-5は、十分に高速応答であり、LC-Bよりも10%以上高速であった。更に、VHRを測定し、十分に高いVHRであることを確認した。なお、セル厚は4um、配向膜はAL1051であり、応答速度の測定条件は、Vonは5.5V、Voffは1.0V、測定温度は20℃で、AUTRONIC-MELCHERS社のDMS301を用いた。VHRの測定条件は、5V、60Hz、測定温度は60℃で、東陽テクニカ社のLCM-2を用いた。
また、比抵抗を測定したところ、1.0E+14(Ω・cm)以上であり、十分に高い比抵抗であることを確認した。なお、比抵抗の測定には川口電機社の比抵抗測定装置MMAII-17を用いた。
(比較例3、実施例6及び実施例7)
LC-C(比較例3)、LC-6(実施例6)及びLC-7(実施例7)の液晶組成物を調製し、その物性値を測定した。液晶組成物の構成とその物性値の結果は表3のとおりであった。
これらを使用した液晶表示素子の応答速度を測定したところ、LC-6及びLC-7は、十分に高速応答であり、LC-Cよりも10%以上高速であった。更に、VHRを測定し、十分に高いVHRであることを確認した。なお、セル厚は4um、配向膜はAL1051であり、応答速度の測定条件は、Vonは5.5V、Voffは1.0V、測定温度は20℃で、AUTRONIC-MELCHERS社のDMS301を用いた。VHRの測定条件は、5V、60Hz、測定温度は60℃で、東陽テクニカ社のLCM-2を用いた。
また、比抵抗を測定したところ、1.0E+14(Ω・cm)以上であり、十分に高い比抵抗であることを確認した。なお、比抵抗の測定には川口電機社の比抵抗測定装置MMAII-17を用いた。
(比較例4、実施例8、実施例9及び実施例10)
LC-D(比較例4)、LC-8(実施例8)、LC-9(実施例9)及びLC-10(実施例10)の液晶組成物を調製し、その物性値を測定した。液晶組成物の構成とその物性値の結果は表4のとおりであった。
これらを使用した液晶表示素子の応答速度を測定したところ、LC-8、LC-9及びLC-10は、十分に高速応答であり、LC-Dよりも10%以上高速であった。更に、VHRを測定し、十分に高いVHRであることを確認した。なお、セル厚は4um、配向膜はAL1051であり、応答速度の測定条件は、Vonは5.5V、Voffは1.0V、測定温度は20℃で、AUTRONIC-MELCHERS社のDMS301を用いた。VHRの測定条件は、5V、60Hz、測定温度は60℃で、東陽テクニカ社のLCM-2を用いた。
また、比抵抗を測定したところ、1.0E+14(Ω・cm)以上であり、十分に高い比抵抗であることを確認した。なお、比抵抗の測定には川口電機社の比抵抗測定装置MMAII-17を用いた。
Claims (14)
- 成分(A)の含有量が10から90質量%である請求項1に記載の液晶組成物。
- 25℃における誘電率異方性(Δε)が2.0から20.0の範囲であり、20℃における屈折率異方性(Δn)が0.08から0.18の範囲であり、20℃における粘度(η)が10から30mPa・sの範囲であり、20℃における回転粘性(γ1)が50から130mPa・sの範囲であり、ネマチック相-等方性液体相転移温度(Tni)が60℃から120℃の範囲である請求項1又は2に記載の液晶組成物。
- 成分(A)として、一般式(Na)、一般式(Nb)又は一般式(Pa)
- 一般式(Na)として一般式(Na01)から一般式(Na12)
- 一般式(Nb)として一般式(Nb01)から一般式(Nb16)
- 更に一般式(XX)
- 請求項1から10のいずれか1項に記載の液晶組成物を用いた液晶表示素子。
- 請求項1から10のいずれか1項に記載の液晶組成物を用いたアクティブマトリックス駆動用液晶表示素子。
- 請求項1から10のいずれか1項に記載の液晶組成物を用いたTN型、IPS型、FFS型、PSAモードの液晶表示素子。
- 請求項1から10のいずれか1項に記載の液晶組成物のアクティブマトリックス駆動用液晶表示素子への使用。
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JP2014543695A JP5700268B2 (ja) | 2013-03-28 | 2014-03-20 | ネマチック液晶組成物及びこれを用いた液晶表示素子 |
EP14774194.6A EP2980185A4 (en) | 2013-03-28 | 2014-03-20 | Nematic liquid crystal composition and liquid crystal display element using same |
US14/780,909 US9487704B2 (en) | 2013-03-28 | 2014-03-20 | Nematic liquid crystal composition and liquid crystal display element using same |
KR1020157021275A KR101619136B1 (ko) | 2013-03-28 | 2014-03-20 | 네마틱 액정 조성물 및 이것을 사용한 액정 표시 소자 |
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US9487704B2 (en) | 2016-11-08 |
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EP2980185A4 (en) | 2017-01-11 |
CN105008489B (zh) | 2017-05-17 |
TW201446941A (zh) | 2014-12-16 |
JPWO2014156947A1 (ja) | 2017-02-16 |
JP5700268B2 (ja) | 2015-04-15 |
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