WO2014126129A1 - 液晶組成物及びそれを使用した液晶表示素子 - Google Patents
液晶組成物及びそれを使用した液晶表示素子 Download PDFInfo
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- WO2014126129A1 WO2014126129A1 PCT/JP2014/053274 JP2014053274W WO2014126129A1 WO 2014126129 A1 WO2014126129 A1 WO 2014126129A1 JP 2014053274 W JP2014053274 W JP 2014053274W WO 2014126129 A1 WO2014126129 A1 WO 2014126129A1
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- 0 C*c(cc1*)c(*)c(*)c1O Chemical compound C*c(cc1*)c(*)c(*)c1O 0.000 description 1
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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
- C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
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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
- C09K2019/0448—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 end chain group being a polymerizable end group, e.g. -Sp-P or acrylate
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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
- C09K19/12—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
- C09K2019/121—Compounds containing phenylene-1,4-diyl (-Ph-)
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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
- C09K19/10—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
- C09K2019/121—Compounds containing phenylene-1,4-diyl (-Ph-)
- C09K2019/123—Ph-Ph-Ph
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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)
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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)
- C09K2019/3009—Cy-Ph
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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)
- C09K2019/301—Cy-Cy-Ph
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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)
- C09K2019/3016—Cy-Ph-Ph
Definitions
- 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, VA (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 factors such as moisture, air, heat, light, etc., and exhibits a liquid crystal phase in the widest possible temperature range centering on room temperature, and has low viscosity. 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 dielectric anisotropy ( ⁇ ), refractive index anisotropy ( ⁇ n), etc. for each display element. Yes.
- liquid crystal compositions using dialkylbicyclohexane compounds having a short side chain length are known (see Patent Document 2), but compounds having three ring structures as compounds having negative dielectric anisotropy are used. It balances the physical properties as a whole by using a compound having a difluoroethylene skeleton.
- the difluoroethylene skeleton used in this composition has a problem of low stability to light, and development of a liquid crystal composition not using such a compound is desired.
- liquid crystal display elements has expanded, and there has been a significant change in the method of use and manufacturing. In order to cope with these, it has become necessary to optimize characteristics other than the basic physical property values as conventionally known.
- VA vertical alignment
- IPS in-plane switching
- the size thereof is an ultra-large size display element of 50 type or more. Came to be used until practical use.
- the liquid crystal composition is injected into the substrate from the conventional vacuum injection method to the drop injection (ODF: One Drop Fill) method (see Patent Document 2).
- a 1 and A 2 each independently represents a 1,4-cyclohexylene group, a 1,4-phenylene group or a tetrahydropyran-2,5-diyl group, but A 1 or and A 2 are 1,4-
- one or more hydrogen atoms in the 1,4-phenylene group may be substituted with fluorine atoms
- Z 1 and Z 2 each independently represent a single bond, —OCH 2 —, —OCF 2 —, —CH 2 O—, or CF 2 O—
- n and m each independently represents 0, 1, 2 or 3
- n + m is 1 to 3, and when there are a plurality of A 1 , A 2 , Z 1 and / or Z 2, They may be the same or different.
- a liquid crystal display element using the
- liquid crystal composition of the present invention a composition excellent in compatibility between the liquid crystal composition and the antioxidant can be provided by a combination with a specific antioxidant.
- liquid crystal composition of the present invention when combined with an antioxidant, it has the characteristics of excellent high-speed response and little occurrence of burn-in, and can reduce the occurrence of dripping marks due to its production.
- the liquid crystal display element of the present invention has characteristics of excellent high-speed response, low occurrence of burn-in, and low occurrence of dripping marks due to its manufacture, so it is useful for display elements such as liquid crystal TVs and monitors. is there.
- the process of generating dripping marks is not clear at this time.
- Impurities in the liquid crystal compound are greatly affected by the production process of the compound, but the production method of the compound is not necessarily the same even if the number of carbon atoms in the side chain is different. That is, since the liquid crystal compound is manufactured by a precise manufacturing process, its cost is high among chemical products, and improvement in manufacturing efficiency is strongly demanded. Therefore, in order to use a raw material that is as low as possible, it may be more efficient to manufacture from a completely different type of raw material even if the number of carbon atoms in the side chain is different by one.
- the lower limit of the total amount of the formula (I) and the formula (II) is 25% by mass, 27% by mass, 29% by mass, 30% by mass, 32% by mass, 35% by mass.
- the upper limit of the total amount of the formulas (I) and (II) is preferably in the order of 80% by mass, 75% by mass, 73% by mass, 70% by mass, and 65% by mass. It is preferably 23 to 70% by mass, more preferably 25 to 65% by mass, still more preferably 32 to 68% by mass, still more preferably 35 to 65% by mass, It is especially preferable to set it as 63 mass%.
- R 1 and R 2 are each an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or 1 carbon atom when the ring structure to be bonded is benzene.
- a 1 and A 2 are each independently preferably a 1,4-cyclohexylenecyclohexylene group, a 1,4-phenylene group or a tetrahydropyran-2,5-diyl group.
- Z 1 and Z 2 are each preferably a single bond when importance is placed on the reduction of viscosity, and —OCH 2 —, —OCF 2 —, —CH when importance is placed on increasing the absolute value of ⁇ . 2 O— or CF 2 O— is preferred, and the oxygen atom is preferably arranged so as to be linked to the 2,3-difluorobenzene-1,4-diyl group.
- an alkenyloxy group having 2 to 8 carbon atoms wherein one or more hydrogen atoms in the alkyl group, alkenyl group, alkoxy group or alkenyloxy group may be substituted with a fluorine atom
- the methylene group in the alkenyl group, alkoxy group or alkenyloxy group may be substituted with an oxygen atom unless the oxygen atom is continuously bonded, and may be substituted with a carbonyl group unless the carbonyl group is bonded continuously.
- n a represents 0, 1 or 2
- n b represents 0, 1 or 2
- a 1a and A 1b each independently represents a 1,4-cyclohexylene group, a 1,4-phenylene group or a tetrahydropyran.
- a 1b is a 1,4-phenylene group
- n b 2
- a 1b may be the same or different, but at least one is a 1,4-phenylene group
- One or more hydrogen atoms in the 1,4-phenylene group in (IIIa) and general formula (IIIb) may be substituted with fluorine atoms.
- R 1a1 to R 1a3 and R 2a1 to R 2a3 represent the same meaning as R 1a and R 2a in formula (IIIa)
- the compounds represented by the general formula (IIIa1) are specifically the following formulas (IIIa1-1) to (IIIa1-8)
- the compounds represented by formulas (IIIa1-1) to (IIIa-4) are more preferred, and the compounds represented by formulas (IIIa1-1) and (IIIa1-4) are preferred. Further preferred.
- the compound represented by the general formula (IIIa1) is preferably contained in an amount of 3 to 30% by mass, more preferably 3 to 25% by mass, and further preferably 3 to 20% by mass.
- -1) to the content of the compound represented by the formula (IIIa1-4) is preferably 50% by mass or more in the compound represented by the general formula (IIIa1), and preferably 70% by mass or more. More preferably, it is more preferably 80% by mass or more.
- the compounds represented by the formula (IIIa1-1), the formula (IIIa1-2) and the formula (IIIa1-4) should be used in combination.
- the content of the compound represented by the formula (IIIa1-1), formula (IIIa1-2) and formula (IIIa1-4) is 50% by mass or more in the compound represented by the general formula (IIIa1).
- it is 70% by mass or more, and more preferably 80% by mass or more.
- the content of the compound represented by 1) and the formula (IIIa1-4) is preferably 50% by mass or more, more preferably 70% by mass or more in the compound represented by the general formula (IIIa1). Preferably, it is 80 mass% or more.
- the compounds represented by the general formula (IIIa2) are specifically the following formulas (IIIa2-1) to (IIIa2-6)
- the compounds represented by formula (IIIa2-1) to formula (IIIa2-4) are more preferred, and the compounds represented by formula (IIIa2-1) to formula (IIIa2-3) are preferred. More preferred are compounds represented by formula (IIIa2-1) and formula (IIIa2-3).
- the content of the compound represented by formula (IIIa2-3) from 1) is preferably 50% by mass or more in the compound represented by general formula (IIIa2), and more preferably 70% by mass or more. Preferably, it is 80 mass% or more.
- the content of the compound represented by 1) and the formula (IIIa2-3) is preferably 50% by mass or more in the compound represented by the general formula (IIIa2), and more preferably 70% by mass or more. Preferably, it is 80 mass% or more.
- the compounds represented by the general formula (IIIa3) are specifically the following formulas (IIIa3-1) to (IIIa3-4)
- the compound represented by the general formula (IIIb) is represented by the following general formulas (IIIb1) and (IIIb2)
- R 1b1 and R 1b2, R 2b1 and R 2b2 each independently represents the same meaning as R 1b and R 2b in the formula (IIIb), n b2 is 0 or 1, A 1b2 1 , 4-cyclohexylene represents a cyclohexylene group, a 1,4-phenylene group or a tetrahydropyran-2,5-diyl group, and represents 1 of 1,4-phenylene groups in the general formulas (IIIb1) and (IIIb2).
- One or more hydrogen atoms may be substituted with a fluorine atom.
- And is preferably selected from the group of compounds represented by:
- the compounds represented by the general formula (IIIb1) are specifically the following formulas (IIIb1-1) to (IIIb1-8)
- the compounds represented by formula (IIIb1-1) to formula (IIIb-4) are more preferred, and the compounds represented by formula (IIIb1-1) and formula (IIIb1-3) are preferred. More preferred is a compound represented by formula (IIIb1-1).
- the compound represented by the general formula (IIIb1) is preferably contained in an amount of 3 to 30% by mass, more preferably 3 to 30% by mass, further preferably 3 to 25% by mass. It is particularly preferable to contain 20% by mass.
- the content of the compound represented by 1) to formula (IIIb1-3) is preferably 50% by mass or more, more preferably 70% by mass or more in the compound represented by the general formula (IIIb1). Preferably, it is 80 mass% or more.
- the content of the compound represented by 1) and the formula (IIIb1-3) is preferably 50% by mass or more in the compound represented by the general formula (IIIb1), and more preferably 70% by mass or more. Preferably, it is 80 mass% or more.
- the compounds represented by general formula (IIIb2) are specifically the following general formulas (IIIb2-1) to (IIIb2-16)
- the compound represented by the general formula (IIIb2) it is preferable to use the compound represented by the formula (IIIb2-5), but the content of the compound represented by the formula (IIIb2-5) However, it is preferable that it is 50 mass% or more in the compound represented by general formula (IIIb2), It is more preferable that it is 70 mass% or more, It is still more preferable that it is 80 mass% or more.
- R 7 and R 8 in the general formula (IIIb2) are each independently an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or the number of carbon atoms Represents an alkenyloxy group having 2 to 8 carbon atoms, preferably an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, preferably an alkyl group having 2 to 5 carbon atoms or 2 carbon atoms.
- an alkenyl group having 5 to 5 carbon atoms still more preferably an alkyl group having 2 to 5 carbon atoms, more preferably a straight chain, and when both R 7 and R 8 are alkyl groups, The number of carbon atoms is preferably different.
- compound R 8 represents a compound or R 7 butyl R 7 represents R 8 is an ethyl group represents a propyl group represents an ethyl group are preferred.
- the liquid crystal composition of the present invention can further contain a compound selected from the group of compounds represented by formulas (VI-a) to (VI-e).
- R 91 to R 9a each independently preferably represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 2 to 10 carbon atoms. More preferably an alkyl group having 2 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 2 to 5 carbon atoms.
- an alkenyl group the following formulas (i) to (iv) )
- R 91 and R 92 may be the same or different, but preferably represent different substituents.
- the compounds represented by the formulas (VI-a) to (VI-e) are more preferably the following compounds.
- formula (VI-a1), formula (VI-a2), formula (VI-a3), formula (VI-a-4), formula (VI-a5), formula (VI-a-6), Formula (VI-b2), Formula (VI-b6), Formula (VI-c2), Formula (II-c4), Formula (VI-c5), Formula (VI-d1) to Formula (VI-d4) and Formula A compound represented by (VI-e2) is preferred.
- the compound represented by the general formula (VI) is common to the compounds represented by the formula (I) and the formula (II) in that the dielectric anisotropy is almost 0, but the formula (I) and
- the ratio of the compound represented by the formula (II) and the compound represented by the general formula (VI) is the ratio between the compound represented by the formula (I) and the formula (II) in the liquid crystal composition and the general formula (VI).
- the content of the compounds represented by formulas (I) and (II) is preferably 30 to 75% by mass, more preferably 35 to 70% by mass, Particularly preferred is .about.65% by weight.
- the total content of the formula (I), the formula (II) and the general formula (VI) is preferably 30 to 70% by mass, preferably 30 to 65% by mass, of the total content of the composition.
- the content is more preferably 30 to 60% by mass, still more preferably 30 to 55% by mass, and particularly preferably 30 to 50% by mass.
- the 1,4-cyclohexyl group in the present application is preferably a trans-1,4-cyclohexyl group.
- the liquid crystal composition according to the present invention comprises the compounds represented by formula (I), formula (II) and general formula (III) as essential components, and further includes those represented by general formula (VI-a) to general formula: A compound represented by (VI-e) can be contained.
- the total content of the compounds represented by formula (I), formula (II), general formula (III) and general formula (VI-a) to general formula (VI-e) contained in the liquid crystal composition is the lower limit.
- the value is preferably 60% by mass, preferably 65% by mass, preferably 70% by mass, preferably 75% by mass, preferably 80% by mass, preferably 85% by mass, preferably 90% by mass, preferably 92% by mass, 95 mass% is preferable, 98 mass% is preferable, 99 mass% is preferable, and 100 mass% is preferable as an upper limit, and 99.5 mass% is preferable.
- the total content of the compounds represented by the formulas (I) and (II) is preferably 30 to 60% by mass, more preferably 30 to 55% by mass, and still more preferably 35 to 50% by mass. .
- the total content of the compounds represented by formula (I) and general formula (III) is preferably 70 to 90% by mass, more preferably 75 to 90% by mass, and still more preferably 80 to 90% by mass.
- the total content of the compounds represented by the formula (II) and the general formula (III) is preferably 45 to 80% by mass, more preferably 50 to 75% by mass, and further preferably 55 to 70% by mass.
- the total content of the compounds represented by formula (I), formula (II) and general formula (III) is preferably 80 to 100% by mass, more preferably 85 to 100% by mass, still more preferably 90 to 100% by mass. .
- the liquid crystal composition of the present invention preferably does not contain a compound having a structure in which oxygen atoms such as a peracid (—CO—OO—) structure are bonded in the molecule.
- the content of the compound having a carbonyl group is preferably 5% by mass or less with respect to the total mass of the composition, and 3% by mass or less. More preferably, it is more preferable to set it as 1 mass% or less, and it is most preferable not to contain substantially.
- the content of the compound substituted with chlorine atoms is preferably 15% by mass or less, more preferably 10% by mass or less, based on the total mass of the composition.
- the content of a compound in which all the ring structures in the molecule are 6-membered rings is 80 It is preferably at least mass%, more preferably at least 90 mass%, even more preferably at least 95 mass%, and the liquid crystal is composed only of a compound having substantially all 6-membered ring structures in the molecule. Most preferably it constitutes a composition.
- the content of the compound having a cyclohexenylene group as a ring structure is determined based on the total mass of the composition.
- the content is preferably 10% by mass or less, more preferably 5% by mass or less, and still more preferably substantially not contained.
- the content of a compound having a 2-methylbenzene-1,4-diyl group in the molecule, in which a hydrogen atom may be substituted with a halogen may be reduced.
- the content of the compound having a 2-methylbenzene-1,4-diyl group in the molecule is preferably 10% by mass or less, and preferably 5% by mass or less based on the total mass of the composition. Is more preferable, and it is still more preferable not to contain substantially.
- the alkenyl group when the compound contained in the composition of the first embodiment of the present invention has an alkenyl group as a side chain, when the alkenyl group is bonded to cyclohexane, the alkenyl group has 2 to 5 carbon atoms.
- the alkenyl group is bonded to benzene, the number of carbon atoms of the alkenyl group is preferably 4 to 5, and the unsaturated bond of the alkenyl group and benzene are directly bonded. Preferably not.
- the value of the dielectric anisotropy ⁇ of the liquid crystal composition in the present invention is preferably ⁇ 2.0 to ⁇ 6.0, more preferably ⁇ 2.5 to ⁇ 5.0 at 25 ° C.
- it is preferably from ⁇ 2.5 to ⁇ 4.0, but more specifically, it is preferably from ⁇ 2.5 to ⁇ 3.4 when the response speed is important, and the drive voltage is When importance is attached, it is preferably -3.4 to -4.0.
- the value of the refractive index anisotropy ⁇ n of the liquid crystal composition in the present invention is preferably 0.08 to 0.13 at 25 ° C., more preferably 0.09 to 0.12. More specifically, it is preferably 0.10 to 0.12 when corresponding to a thin cell gap, and preferably 0.08 to 0.10 when corresponding to a thick cell gap.
- the rotational viscosity ( ⁇ 1 ) of the liquid crystal composition in the present invention is preferably 150 or less, more preferably 130 or less, and particularly preferably 120 or less.
- Z as a function of rotational viscosity and refractive index anisotropy shows a specific value.
- ⁇ 1 represents rotational viscosity
- ⁇ n represents refractive index anisotropy.
- Z is preferably 13000 or less, more preferably 12000 or less, and particularly preferably 11000 or less.
- the liquid crystal composition of the present invention in the case of using the active matrix display device, it is necessary to have a 10 12 ( ⁇ ⁇ m) or more in specific resistance, 10 13 ( ⁇ ⁇ m) is preferable, 10 14 ( ⁇ ⁇ m) or more is more preferable.
- the liquid crystal composition of the present invention may contain a normal nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal, an antioxidant, an ultraviolet absorber, a polymerizable monomer, etc., in addition to the above-described compounds,
- a normal nematic liquid crystal a smectic liquid crystal, a cholesteric liquid crystal, an antioxidant, an ultraviolet absorber, a polymerizable monomer, etc.
- a naphthalene ring may be included. It is desirable that the molecule does not have a condensed ring having a long conjugated length and an absorption peak in the ultraviolet region.
- a phenol-based antioxidant and a phosphorus-based antioxidant are preferable.
- phenol-based antioxidant examples include compounds represented by general formula (a), formula (A-1), formula (A-2), formula (A-3), formula (A-4), and vitamin E. It is preferably at least one selected from the group consisting of
- R a1 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 14 and R 15 each independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.
- M 11 represents a linear or branched alkylene group having 1 to 8 carbon atoms, a cyclic alkylene having 4 to 8 carbon atoms, or a single bond
- Z 11 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, —S (CH 2 ) m CH 3 or the following formula (b):
- X 1 represents a hydrogen atom or a (meth) acrylate group
- R a2 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 24 and R 25 are each independently Represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- M 22 represents an alkylene group having 1 to 8 carbon atoms or a single bond
- Z 22 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.
- m represents an integer of 1 to 15.
- M 12 represents a linear or branched alkylene group having 1 to 8 carbon atoms, a cyclic alkylene having 4 to 8 carbon atoms (particularly preferred is a 1,4-cyclohexane ring), a single bond, —NH—, —S— or — (CH 2 ) a —C ( ⁇ O) NH—NH—C ( ⁇ O) — (CH 2 ) b —, and M 12 is an alkylene group having 1 to 8 carbon atoms
- R 30 to R 33 represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.
- c and d are each independently an integer of 1 or more and 10 or less.
- R a1 or Z 11 is an alkyl group having 1 to 6 carbon atoms.
- R a2 is preferably an alkyl group having 1 to 6 carbon atoms.
- the alkylene group of M 11 and M 12 is preferably a methylene group or a branched alkylene group.
- the alkyl group having 1 to 6 carbon atoms is preferably a methyl group, a t-butyl group or a t-pentyl group.
- w is an integer of 1 to 1000. It is preferable that it is a compound represented by these.
- the phosphorus antioxidant according to the present invention is represented by the general formula (B):
- each of the ring A and the ring B is independently a phenyl group substituted with an alkyl group having 1 to 10 carbon atoms, and the ring A and the ring B are directly bonded to each other.
- G may be — [(CH 2 ) f —] v —N (f is an integer of 0 to 15), a phenyl group substituted with an alkyl group having 1 to 6 carbon atoms, ring A or the formula (E):
- R 23 to R 26 each independently represents an alkyl group having 1 to 10 carbon atoms, and any one of R 23 to R 26 is an alkyl group having a quaternary carbon.
- M 22 is an alkylene group having 1 to 10 carbon atoms.
- And v is an integer of 1 to 3. It is preferable that it is a compound represented by this.
- phenolic antioxidant according to the present invention include compounds represented by the following formulas (A-1) to (A-16). Of these, the phenolic antioxidants represented by formulas (A-12) to (A-16) are preferred from the viewpoint of compatibility with the liquid crystal composition.
- R 1 represents a linear or branched alkyl group having 1 to 24 carbon atoms, and one or two or more CH 2 groups in the alkyl group are not directly adjacent to an oxygen atom. Thus, it may be substituted with —O—, —CO—, —OCO—, —COO—, and M 1 represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group or a single bond.
- M1 is preferably a single bond or a trans-1,4-cyclohexylene group, and R1 is preferably a linear alkyl group having 3 to 9 carbon atoms.
- R1 is preferably a trans-1,4-cyclohexylene group
- an alkyl group having 3 to 7 carbon atoms is preferable
- M1 is a single bond
- an alkyl group having 5 to 9 carbon atoms is preferable.
- X 7 and X 8 each independently represent a hydrogen atom or a methyl group
- Sp 1 and Sp 2 are each independently a single bond, an alkylene group having 1 to 8 carbon atoms, or —O— (CH 2 ) s —.
- Sp 1 and Sp 2 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms or —O— (CH 2 ) s —, but at least one of them is a single bond in a PSA display element.
- a compound in which both represent a single bond or one in which one represents a single bond and the other represents an alkylene group having 1 to 8 carbon atoms or —O— (CH 2 ) s — is preferable.
- 1 to 4 alkyl groups are preferable, and s is preferably 1 to 4.
- Examples of the stabilizer that can be used include hydroquinones, hydroquinone monoalkyl ethers, tert-butylcatechols, pyrogallols, thiophenols, nitro compounds, ⁇ -naphthylamines, ⁇ -naphthols, nitroso compounds, and the like. It is done.
- the liquid crystal composition not containing the compound represented by the formula (I) (Comparative Example 1) is equivalent to the liquid crystal composition containing 31% of the compound represented by the formula (I) (Example 1).
- the liquid crystal phase temperature range, the equivalent refractive index anisotropy value, and the equivalent dielectric anisotropy value were shown, it was shown that the viscosity ⁇ increased.
- ⁇ 1 / ⁇ n 2 which is a parameter representing
- the liquid crystal composition not containing the compound represented by the general formula (II) (Comparative Example 2) is compared with the liquid crystal composition containing 11% of the compound represented by the general formula (II) (Example 1). It was shown that the viscosity ⁇ and the rotational viscosity ⁇ 1 were increased although they had the same liquid crystal phase temperature range, the same value of refractive index anisotropy, and the same value of dielectric anisotropy.
- the initial VHR of Comparative Example 2 was 99.1%, whereas the VHR after standing at high temperature for 1 hour at 150 ° C. was 97.7%, which was inferior to that of Example 1. It was. When the process suitability was evaluated, the change was unacceptable as compared with Example 1.
- Example 3 Using the liquid crystal composition of Example 3, a VA liquid crystal display element was produced in the same manner as in Example 1, and the results of evaluation of image sticking, dripping marks, process compatibility, and solubility at low temperatures are shown in the same table. .
- Example 4 A liquid crystal composition having the following composition designed to have the same liquid crystal phase temperature range, equivalent refractive index anisotropy value and equivalent dielectric anisotropy value as the compositions of Examples 1 to 3. Was prepared and the physical properties thereof were measured. The results are shown in the following table.
- the liquid crystal composition not containing the compound represented by the general formula (II) (Comparative Example 8) is compared with the liquid crystal composition containing 12% of the compound represented by the general formula (II) (Example 4). It was shown that the viscosity ⁇ and the rotational viscosity ⁇ 1 were increased although they had the same liquid crystal phase temperature range, the same value of refractive index anisotropy, and the same value of dielectric anisotropy.
- the initial VHR of Comparative Example 6 was 98.3%, whereas the VHR after being left at a high temperature of 150 ° C. for 1 hour was 97.2%, which was inferior to Example 4. . When the process suitability was evaluated, the change was unacceptable compared to Example 4. When the solubility at low temperature was evaluated, precipitation was observed earlier than in Example 4.
- the liquid crystal compositions of Examples 5 to 8 have a practical liquid crystal phase temperature range as a liquid crystal composition for TV, a large absolute value of dielectric anisotropy, a low viscosity, and an optimal ⁇ n.
- a VA liquid crystal display element was prepared and evaluated for image sticking, dripping marks, process suitability, and solubility at low temperatures by the above-described methods. Indicated. Further, 0.003 parts by mass of an antioxidant represented by the formula (A-13) or (A-15) was added to 100 parts by mass of the liquid crystal compositions of Examples 1 to 8, and the solubility evaluation was performed.
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Abstract
Description
従来、γ1の小さい液晶組成物を構成するためには、ジアルキルビシクロヘキサン骨格を有する化合物を用いることが一般的であった(特許文献1参照)。しかしながら、ビシクロヘキサン系化合物はγ1の低減には効果が高いものの、一般に蒸気圧が高いという問題点があり、アルキル鎖長の短い化合物は特にその傾向が顕著である。又、Tniも低い傾向があることからそのため、アルキルビシクロヘキサン系化合物は側鎖長の合計が炭素原子数7以上の化合物を用いることが多く、側鎖長の短い化合物については十分な検討がなされていないのが実情であった。
A1及びA2はそれぞれ独立して、1,4-シクロヘキシレン基、1,4-フェニレン基又はテトラヒドロピラン-2,5-ジイル基を表すが、A1又は及びA2が1,4-フェニレン基を表す場合、該1,4-フェニレン基中の1つ以上の水素原子はフッ素原子に置換されていてもよく、
Z1及びZ2はそれぞれ独立して単結合、-OCH2-、-OCF2-、-CH2O-、又はCF2O-を表し、
n及びmはそれぞれ独立して、0、1、2又は3を表すが、n+mは1~3であり、A1、A2、Z1及び/又はZ2が複数存在する場合にはそれらは同一であっても異なっていてもよい。)で表される化合物を1種以上含有する誘電率異方性が負の液晶組成物及び当該液晶組成物を用いた液晶表示素子及び当該液晶表示素子を用いた液晶ディスプレイに関するものである。
2 基板
3 透明電極もしくはアクティブ素子を伴う透明電極
4 配向膜
5 液晶
11 ゲート電極
12 陽極酸化皮膜
13 ゲート絶縁層
14 透明電極
15 ドレイン電極
16 オーミック接触層
17 半導体層
18 保護膜
19a ソース電極1
19b ソース電極2
100 基板
101 保護層
23~70質量%にすることが好ましく、25~65質量%にすることがより好ましく、32~68質量%にすることがさらに好ましく、35~65質量%にすることがよりさらに好ましく、37~63質量%にすることが特に好ましい。
で表される構造が好ましいが、本願発明の液晶組成物が反応性モノマーを含有する場合は、式(ii)及び式(iv)で表される構造が好ましく、式(ii)で表される構造がより好ましい。
naは0、1又は2を表し、nbは0、1又は2を表し、A1a及びA1bはそれぞれ独立して、1,4-シクロヘキシレン基、1,4-フェニレン基又はテトラヒドロピラン-2,5-ジイル基を表し、na=2の場合、A1aは同一であっても異なっていてもよいが、少なくとも1つは1,4-フェニレン基であり、nb=1の場合A1bは1,4-フェニレン基であり、nb=2の場合、A1bは同一であっても異なっていてもよいが、少なくとも1つは1,4-フェニレン基であり、一般式(IIIa)及び一般式(IIIb)中の1,4-フェニレン基中の1つ以上の水素原子はフッ素原子に置換されていてもよい。)
で表される化合物群の中から少なくとも1種類が選ばれることが好ましい。
一般式(IIIa1)で表される化合物は、3~30質量%含有することが好ましいが、3~25質量%含有することがより好ましく、3~20質量%含有することが更に好ましい。
一般式(IIIa3)で表される化合物は具体的には次に記載する式(IIIa3-1)~(IIIa3-4)
一般式(IIIb1)で表される化合物は、3~30質量%含有することが好ましいが、3~30質量%含有することがより好ましく、3~25質量%含有することが更に好ましく、3~20質量%含有することが特に好ましい。
で表される化合物が好ましいが、式(IIIb2-1)、式(IIIb2-3)~式(IIIb2-9)及び式(IIIb2-12)~式(IIIb2-15)がより好ましく、式(IIIb2-1)、式(IIIb2-3)、式(IIIb2-5)、式(IIIb2-6)、式(IIIb2-9)、式(IIIb2-12)及び式(IIIb2-15)が更に好ましく、式(IIIb2-1)、式(IIIb2-5)、式(IIIb2-6)が特に好ましく、式(IIIb2-5)が最も好ましい。
一般式(VI-a)から一般式(VI-e)で表される化合物群から選ばれる化合物を含有する場合、1種~10種含有することが好ましく、1種~8種含有することが特に好ましく、1種~5種含有することが特に好ましく、2種以上の化合物を含有することも好ましい、この場合の含有量は5~40質量%であることが好ましく、5~35質量%であることが更に好ましく、7~30質量%であることが特に好ましい。
で表される構造が好ましいが、本願発明の液晶組成物が反応性モノマーを含有する場合は、式(ii)及び式(iv)で表される構造が好ましく、式(ii)で表される構造がより好ましい。
Zは、13000以下が好ましく、12000以下がより好ましく、11000以下が特に好ましい。
M11は炭素原子数1~8の直鎖状または分岐状アルキレン基、炭素原子数4~8個の環状のアルキレンまたは単結合を表し、
Z11は、水素原子、炭素原子数1~10のアルキル基、-S(CH2)mCH3または以下の式(b):
M12は、炭素原子数1~8の直鎖状または分岐状アルキレン基、炭素原子数4~8個の環状のアルキレン(特に1、4-シクロヘキサン環が好ましい)、単結合、-NH-、-S-または-(CH2)a-C(=O)NH-NH-C(=O)-(CH2)b-を表し、またM12が炭素原子数1~8のアルキレン基の場合は、水素原子が前記式(b)に置換されてもよく、前記aおよびbはそれぞれ独立して、1以上5以下の整数であり、
Z12は、水酸基、-C(=O)-O-CgH2g+1(g=1以上20以下の整数)または一般式(c):
または式(d):
で表される化合物であることが好ましい。
を表し、vは1以上3以下の整数である。)で表される化合物であることが好ましい。
Sp1及びSp2はそれぞれ独立して、単結合、炭素原子数1~8のアルキレン基又は-O-(CH2)s-
(式中、sは2から7の整数を表し、酸素原子は芳香環に結合するものとする。)を表し、
Z2は-OCH2-、-CH2O-、-COO-、-OCO-、-CF2O-、-OCF2-、-CH2CH2-、-CF2CF2-、-CH=CH-COO-、-CH=CH-OCO-、-COO-CH=CH-、-OCO-CH=CH-、-COO-CH2CH2-、-OCO-CH2CH2-、-CH2CH2-COO-、-CH2CH2-OCO-、-COO-CH2-、-OCO-CH2-、-CH2-COO-、-CH2-OCO-、-CY1=CY2-(式中、Y1及びY2はそれぞれ独立して、フッ素原子又は水素原子を表す。)、-C≡C-又は単結合を表し、
Bは1,4-フェニレン基、トランスー1,4-シクロヘキシレン基又は単結合を表し、式中の全ての1,4-フェニレン基は、任意の水素原子がフッ素原子により置換されていても良い。)で表されるニ官能モノマーが好ましい。
を表すことが好ましく、式(VIIa-1)から式(VIIa-3)を表すことがより好ましく、式(VIIa-1)を表すことが特に好ましい。
本発明の液晶組成物にモノマーを添加する場合において、重合開始剤が存在しない場合でも重合は進行するが、重合を促進するために重合開始剤を含有していてもよい。重合開始剤としては、ベンゾインエーテル類、ベンゾフェノン類、アセトフェノン類、ベンジルケタール類、アシルフォスフィンオキサイド類等が挙げられる。また、保存安定性を向上させるために、安定剤を添加しても良い。使用できる安定剤としては、例えば、ヒドロキノン類、ヒドロキノンモノアルキルエーテル類、第三ブチルカテコール類、ピロガロール類、チオフェノール類、ニトロ化合物類、β-ナフチルアミン類、β-ナフトール類、ニトロソ化合物等が挙げられる。
Δn :25℃における屈折率異方性
Δε :25℃における誘電率異方性
η :20℃における粘度(mPa・s)
γ1 :25℃における回転粘度(mPa・s)
VHR:周波数60Hz,印加電圧1Vの条件下で60℃における電圧保持率(%)
焼き付き :
液晶表示素子の焼き付き評価は、表示エリア内に所定の固定パターンを1000時間表示させた後に、全画面均一な表示を行ったときの固定パターンの残像のレベルを目視にて以下の4段階評価で行った。
○残像ごく僅かに有るも許容できるレベル
△残像有り許容できないレベル
×残像有りかなり劣悪
滴下痕 :
液晶表示装置の滴下痕の評価は、全面黒表示した場合における白く浮かび上がる滴下痕を目視にて以下の4段階評価で行った。
○残像ごく僅かに有るも許容できるレベル
△残像有り許容できないレベル
×残像有りかなり劣悪
プロセス適合性 :
プロセス適合性は、ODFプロセスにおいて、定積計量ポンプを用いて1回に50pLずつ液晶を滴下することを100000回行い、次の「0~100回、101~200回、201~300回、・・・・99901~100000回」の各100回ずつ滴下された液晶量の変化を以下の4段階で評価した。
○変化が僅かに有るも許容できるレベル
△変化が有り許容できないレベル(斑発生により歩留まりが悪化)
×変化が有りかなり劣悪(液晶漏れや真空気泡が発生)
低温での溶解性:
低温での溶解性評価は、液晶組成物を調製後、2mLのサンプル瓶に液晶組成物を1g秤量し、これに温度制御式試験槽の中で、次を1サイクル「-20℃(1時間保持)→昇温(0.1℃/毎分)→0℃(1時間保持)→昇温(0.1℃/毎分)→20℃(1時間保持)→降温(-0.1℃/毎分)→0℃(1時間保持)→降温(-0.1℃/毎分)→-20℃」として温度変化を与え続け、目視にて液晶組成物からの析出物の発生を観察し、以下の4段階評価を行った。
尚、実施例において化合物の記載について以下の略号を用いる。
(側鎖)
-n -CnH2n+1 炭素原子数nの直鎖状アルキル基
-On -OCnH2n+1 炭素原子数nの直鎖状アルコキシ基
-V -C=CH2 ビニル基
(環構造)
次に示す組成を有する液晶組成物を調製し、その物性値を測定した。この結果を次の表に示す。
(比較例1)
式(I)で表される化合物を含有せず、実施例1の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した以下に示される液晶組成物を調製し、その物性値を測定した。この結果を次の表に示す。
(比較例2)
一般式(II)で表される化合物を含有しせず、実施例1の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した以下に示される液晶組成物を調製し、その物性値を測定した。この結果を次の表に示す。
(実施例2)
実施例1の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した次に示す組成を有する液晶組成物を調製し、その物性値を測定した。この結果を次の表に示す。
(比較例3及び4)
式(I)で表される化合物を含有せず、実施例1及び2の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した液晶組成物(比較例3)及び一般式(II)で表される化合物を含有せず、実施例1及び2の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した液晶組成物(比較例4)を調製し、その物性値を測定した。この結果を次の表に示す。
(実施例3)
実施例1及び2の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した次に示す組成を有する液晶組成物を調製し、その物性値を測定した。この結果を次の表に示す。
(比較例5及び6)
式(I)で表される化合物を含有せず、実施例1~3の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した液晶組成物(比較例5)及び一般式(II)で表される化合物を含有せず、実施例1~3の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した液晶組成物(比較例6)を調製し、その物性値を測定した。この結果を次の表に示す。
(実施例4)
実施例1~3の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した次に示す組成を有する液晶組成物を調製し、その物性値を測定した。この結果を次の表に示す。
(比較例7及び8)
式(I)で表される化合物を含有せず、実施例4の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した液晶組成物(比較例7)及び一般式(II)で表される化合物を含有せず、実施例4の組成物と同等の液晶相温度範囲、同等の屈折率異方性の値及び同等の誘電率異方性の値を有するように設計した液晶組成物(比較例8)を調製し、その物性値を測定した。この結果を次の表に示す。
Claims (7)
- 式(I)
A1及びA2はそれぞれ独立して、1,4-シクロヘキシレン基、1,4-フェニレン基又はテトラヒドロピラン-2,5-ジイル基を表すが、A1又は/及びA2が1,4-フェニレン基を表す場合、該1,4-フェニレン基中の1つ以上の水素原子はフッ素原子に置換されていてもよく、
Z1及びZ2はそれぞれ独立して単結合、-OCH2-、-OCF2-、-CH2O-、又はCF2O-を表し、
n及びmはそれぞれ独立して、0、1、2又は3を表すが、n+mは1~3であり、A1、A2、Z1及び/又はZ2が複数存在する場合にはそれらは同一であっても異なっていてもよい。)で表される化合物を1種以上含有する誘電率異方性が負の液晶組成物。 - 式(I)で表される化合物を25質量%以上含有する請求項1に記載の液晶組成物。
- 一般式(III)で表される化合物として次の一般式(IIIa)及び一般式(IIIb)
naは0、1又は2を表し、nbは0、1又は2を表し、A1a及びA1bはそれぞれ独立して、1,4-シクロヘキシレン基、1,4-フェニレン基又はテトラヒドロピラン-2,5-ジイル基を表し、na=2の場合、A1aは同一であっても異なっていてもよいが、少なくとも1つは1,4-フェニレン基であり、nb=1の場合A1bは1,4-フェニレン基であり、nb=2の場合、A1bは同一であっても異なっていてもよいが、少なくとも1つは1,4-フェニレン基であり、一般式(IIIa)及び一般式(IIIb)中の1,4-フェニレン基中の1つ以上の水素原子はフッ素原子に置換されていてもよい。)
で表される化合物群から選ばれる少なくとも1種類の化合物を含有する請求項1に記載の液晶組成物。 - 反応性モノマーを含有する請求項1に記載の液晶組成物。
- 請求項1に記載の液晶組成物を用いた液晶表示素子。
- 請求項4に記載の液晶組成物を用いた液晶表示素子。
- 請求項5又は6に記載の液晶表示素子を用いた液晶ディスプレイ。
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JP2015500273A JP6094909B2 (ja) | 2013-02-15 | 2014-02-13 | 液晶組成物及びそれを使用した液晶表示素子 |
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JP6555450B1 (ja) * | 2017-12-11 | 2019-08-07 | Dic株式会社 | 液晶表示素子 |
CN114350380A (zh) * | 2022-01-13 | 2022-04-15 | 烟台显华科技集团股份有限公司 | 负介电各向异性液晶组合物、光学各向异构体及液晶显示器件 |
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JP5828906B2 (ja) * | 2013-02-15 | 2015-12-09 | Dic株式会社 | 液晶組成物及びそれを使用した液晶表示素子 |
CN108239545B (zh) * | 2016-12-23 | 2022-02-25 | 江苏和成显示科技有限公司 | 具有负介电各向异性的液晶组合物及其显示器件 |
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TW201446944A (zh) | 2014-12-16 |
CN105102585B (zh) | 2018-07-06 |
JPWO2014125618A1 (ja) | 2017-02-02 |
JP6094909B2 (ja) | 2017-03-15 |
JPWO2014126129A1 (ja) | 2017-02-02 |
TWI618783B (zh) | 2018-03-21 |
CN105102585A (zh) | 2015-11-25 |
JP5828906B2 (ja) | 2015-12-09 |
WO2014125618A1 (ja) | 2014-08-21 |
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