WO2002018515A1 - Liquid crystal mixture - Google Patents

Liquid crystal mixture Download PDF

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Publication number
WO2002018515A1
WO2002018515A1 PCT/EP2001/009832 EP0109832W WO0218515A1 WO 2002018515 A1 WO2002018515 A1 WO 2002018515A1 EP 0109832 W EP0109832 W EP 0109832W WO 0218515 A1 WO0218515 A1 WO 0218515A1
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diyl
atoms
alkyl
optionally substituted
optionally
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English (en)
French (fr)
Inventor
Ji Li
Toshiaki Nonaka
Ayako Ogawa
Hans-Rolf DÜBAL
Barbara Hornung
Wolfgang Schmidt
Rainer Wingen
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Clariant International Ltd
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Clariant International Ltd
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Priority to JP2002524018A priority Critical patent/JP5269279B2/ja
Priority to EP01969650A priority patent/EP1319054B1/en
Priority to DE60109466T priority patent/DE60109466T2/de
Priority to KR1020037002809A priority patent/KR100890345B1/ko
Priority to US10/363,009 priority patent/US6958176B2/en
Publication of WO2002018515A1 publication Critical patent/WO2002018515A1/en
Anticipated expiration legal-status Critical
Priority to US11/201,605 priority patent/US9388338B2/en
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/54—Additives having no specific mesophase characterised by their chemical composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/58—Dopants or charge transfer agents
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
    • C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
    • C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
    • C07D211/36—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D211/40—Oxygen atoms
    • C07D211/44—Oxygen atoms attached in position 4
    • C07D211/46—Oxygen atoms attached in position 4 having a hydrogen atom as the second substituent in position 4
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/34—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring
    • C09K19/3441—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom
    • C09K19/3483—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom the heterocyclic ring being a non-aromatic ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
    • C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
    • C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
    • C07D211/08—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
    • C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
    • C07D211/08—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms
    • C07D211/18—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/02—Liquid crystal materials characterised by optical, electrical or physical properties of the components, in general
    • C09K19/0225—Ferroelectric
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/02—Liquid crystal materials characterised by optical, electrical or physical properties of the components, in general
    • C09K19/0266—Antiferroelectrics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition

Definitions

  • the present invention relates to a novel liquid crystal mixture. More particularly, it relates to a chiral smectic or ferroelectric liquid crystal mixture, which is chemically very stable against heat and light, thus being especially suitable for active matrix panels.
  • a further aspect of this invention is the use of this liquid crystal mixture in displays, especially active matrix displays.
  • Yet another aspect of this invention are active matrix displays comprising such a mixture.
  • the 'pixel speed' is easily 100 or even 1000 times faster than nematics and secondly, due to the bistability, the resolution of such displays is not limited by the material.
  • passive matrix FLC displays are limited by certain trade-off relationships: the higher the number of scanning lines, the higher is the frame addressing time and thus the speed of a display is always in competition with its resolution.
  • Asao et.al. have presented a monostable FLC mode (Y. Asao et al., ILCC 2000, Sendai, and Jpn. J. Appl. Phys. 38, L534-L536, 1999 therein called "half-V-shape FLC” mode; see also T. Nonaka et.al., Liquid Crystals 26(11), 1599-1602, 1999, therein called “CDR” mode).
  • Such displays provide, by virtue of their smaller Ps values, solutions for the gray scale problem and the resolution limitation caused by too large P s values in active matrix panels.
  • TFT-LCD e.g. monostable FLC
  • TFT-LCD e.g. monostable FLC
  • the problem of ionic charges which build up depolarisation fields leads to significant limitations (cp. Sasaki, Japan Display 1986,62; Nakazono, Int. D_ev. Res. Cent. Techn. Rep. IDRC 1997, 65; Naemura, SID Dig. Techn.Pap.1989, 242; Fukuoka, AM LCD 1994, 216; Takatori, AM-LCD 97 DIGEST 1997, 53; Takatoh, Polym.Adv,Technol. 11 , 413 (2000)).
  • the object of the present invention was therefore to provide a liquid crystal mixture with very high resistivity or holding ratio irrespective of the comprisment of hetero atoms, especially a chiral smectic, in particular ferroelectric or antiferroelectric liquid crystal mixtures which are suitable for active matrix panels, especially with respect to withstanding heat- or light-induced chemical stress while maintaining the performance of a low-ion-content mixture.
  • the present invention provides a liquid crystal mixture, especially a chiral smectic mixture, in particular a ferroelectric or antiferroelectric liquid crystal mixture, most particularly a monostable ferroelectric liquid crystal mixture comprising one or several compounds of formula (I)
  • R 3 , R 4 , R 5 , R 6 represent independently from another an alkyl group of 1 to 8 C atoms
  • phenylen-1 ,4-diyl which optionally can be substitued by one, two or three F, or cyclohexan-1 ,4-diyl, which can optionally be substituted by one CN, CH 3 or F, or fer pyrimidin-2,5-diyl, optionally substituted by one F, pyridine-2,5-diyl, which can optionally be substituted by one F, or naphthalene-2,6-diyl, which can optionally be substituted by one, two or three F, or 1 ,2,3,4-tetrahydronaphthalene-2,6-diyl (the aromatic ring optionally substituted by one, two or three F), or decahydronaphthalene-2,6-diyl, or indane-2,5(6)-diyl, or fluorene-2,-7-diyl, or phenanthrene-2,7-diyl, or 9,10-d
  • the mixtures comprise 0.01 wt.-% to 0 wt.-
  • mixtures comprise 0.1 wt.-% to 5 wt.-% of one or several compounds of formula (I).
  • mixtures comprise one or several compounds of the following formulae
  • R 1 is H or alkyl of 1 to 4 C atoms
  • R 3 , R 4 , R 5 , R 6 are CH 3 and/or
  • R 1 is H or alkyl of 1 to 4 C atoms
  • R 3 , R 4 , R 5 , R 6 are CH 3 and/or
  • R 1 is H or alkyl of 1 to 4 C atoms
  • R 3 , R 4 , R 5 , R 6 are CH 3 and/or
  • R 1 is H or alkyl of 1 to 4 C atoms R>3 J , R 4 , R°, R° are CH,
  • R 1 is H or alkyl of 1 to 4 C atoms
  • R 3 , R 4 , R 5 , R 6 are CH 3
  • R is H or alkyl of 1 to 4 C atoms
  • R 3 , R 4 , R 5 , R 6 are CH 3
  • R 2 is H
  • R 1 is H or alkyl of 1 to 4 C atoms
  • R 3 , R 4 , R 5 , R 6 are CH 3
  • phenylen- ,4-diyl is phenylen- ,4-diyl, optionally substituted by one or two F, or cyclohexylen-1 ,4-diyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl and/or
  • R 1 is H or alkyl of 1 to 4 C atoms
  • R 3 , R 4 , R 5 , R 6 are CH 3
  • M 2 is a single bond
  • phenylen-1 ,4-diyl is phenylen-1 ,4-diyl, optionally substituted by one or two F, or cyclohexylen-1 ,4- diyl, pyrimidine-2,5-diyl, or pyridine-2,5-diyl
  • phenylen-1 ,4-diyl is phenylen-1 ,4-diyl, optionally substituted by one or two F, or cyclohexylen-1 ,4- diyl, pyrimidine-2,5-diyl, or py rid i n e-2 , 5-d iyl
  • R 1 is H or alkyl of 1 to 4 C atoms
  • R 3 , R 4 , R 5 , R 6 are CH 3
  • M 1 is a single bond
  • M 2 is a single bond
  • phenylen-1 ,4-diyl is phenylen-1 ,4-diyl, optionally substituted by one or two F, or cyclohexylen-1 ,4- diyl,
  • R 1 is H or alkyl of 1 to 4 C atoms
  • R 3 , R 4 , R 5 , R 6 are CH 3
  • M 1 is a single bond
  • M 2 is a single bond
  • M 3 is a single bond is phenylen-1 ,4-diyl, optionally substituted by one or two F, or cyclohexylen-1 ,4- diyl,
  • R 2 an alkyl group of 1 to 20 C atoms
  • R 2 an alkyl group of 1 to 20 C atoms
  • phenylen-1 ,4-diyl can be obtained by bringing into reaction 2,2,6,6-tetramethyl- piperidine-4-one and phenol (in analogy to SU 631 516; CA 90:54839) to render 3,4-dehydro-4-(4-hydroxyphenyl)-2,2,6,6-tetramethyl-piperidine, which is hydrogenated to 4-(4-hydroxyphe ⁇ yl)-2,2,6,6-tetramethyl-piperidine (in analogy to DE-A-2 258 086).
  • This material can be (in analogy to US-A-4 038 280, Example 25) transfered to the above mentioned examples of (lb) by reacting with an appropriate alkyl halide X-R 2 (X: Halide, Tosylate, Mesylate; R 2 not H or F).
  • phenylen-1 ,4-diyl is phenylen-1 ,4-diyl, optionally substituted by one, two or three F, or cyclohexyl- 1 ,4-diyl, optionally substituted by one CN, CH 3 or F, or pyrimidin-2,5-diyl, pyridin- 2,5-diyl, naphthalin-2,6-diyl, optionally substituted by one, two or three F, thiophen- 2,4-diyl, thiophen-2,5-diyl, can be obtained by subjecting above mentioned 4-(4- hydroxy-phenyl)-2,2,6,6-tetramethyl-piperidine and 4-(4-hydroxycyclohexyl)-
  • phenylen-1 ,4-diyl is phenylen-1 ,4-diyl, optionally substituted by one, two or three F, or cyclohexyl- 1 ,4-diyl, optionally substituted by one CN, CH 3 or F, or pyrimidin-2,5-diyl, pyridin- 2,5-diyl, naphthalin-2,6-diyl, optionally substituted by one, two or three F, or thiophen-2,4-diyl, thiophen-2,5-diyl, can be obtained by subjecting (in anlogy to US-A-4 038 280, Example 25) above mentioned 4-(4-hydroxyphenyl)-2,2,6,6- tetramethyl-piperidine and 4-(4-hydroxycyclohexyl)-2,2,6,6-tetramethyl-piperidine, respectively, to etherification with a moiety (X: Cl, Br, Tosylate
  • phenylen-1 ,4-diyl is phenylen-1 ,4-diyl, optionally substituted by one, two or three F, or cyclohexyl- ,4-diyl, optionally substituted by one CN, CH 3 or F, or pyrimidin-2,5-diyl, pyridin- 2,5-diyl, naphthalin-2,6-diyl, optionally substituted by one, two or three F, thiophen- 2,4-diyl, thiophen-2,5-diyl, can be obtained by subjecting above mentioned 4-(4- hydroxy-pheny])-2,2,6,6-tetramethyl-piperidine and 4-(4-hydroxycyclohexyl)- 2,2,6,6-tetramethyl-piperidine, respectively, after transformation into an appropriate derivate (e.g.
  • a further object of the invention is to provide compounds of formula (II) and a nematic liquid crystal mixture comprising at least one compound of formula (I) or (II).
  • the mixture comprises 0,05 to 5% of one or several compounds of formula (I) and / or (II).
  • mixtures comprising 0,05 to 5% of one or several compounds of formula (II).
  • R 1 is H or alkyl of 1 to 12 C atoms
  • phenylen-1 ,4-diyl is phenylen-1 ,4-diyl, optionally substituted by one or two F, cyclohexylen-1 ,4-diyl, biphenyl-4,4'-diyl,optionally substituted by one or two F per ring, 1 ,1'-cyclohexyl- phenyl-4,4'-diyl, the phenyl moiety optionally substituted by one or two F, or 1 ,1'- phenylcyclohexyl-4,4'-diyl, the phenyl moiety optionally substituted by one or two F, or 1,1'-bicyclohexyl-4,4'-diyl
  • R 2 is H only in case p is 1 b) if p is 0, than R 2 is a linear or branched alkyl group of 1 to 16 or linear or
  • a further object of the invention is to provide compounds of formula (III) and a chiral smectic liquid crystal mixture comprising at least one compound of formula (III).
  • the mixture comprises 0,05 to 5% of one or several compounds of formula (III).
  • R 1 is H or alkyl of 1 to 12 C atoms
  • pyrimidin-2,5-diyl is pyrimidin-2,5-diyl, pyridin-2,5-diyl, optionally ortho to N substituted by F, phenylen-1 ,4-diyl, optionally substituted by one or two F, or cyclohexylen-1 ,4-diyl, biphenyl-4,4'-diyl,optionally substituted by one or two F per ring, 1 ,1'- cyclohexylphenyl-4,4'-diyl, the phenyl moiety optionally substituted by one or two F, or 1 ,1'-phenylcyclohexyl-4.4'-diyl, the phenyl moiety optionally substituted by one or two F, or 1 ,1 '-bicyclohexyl-4,4'-diyl
  • phenylen-1 ,4-diyl is phenylen-1 ,4-diyl,optionally substituted by one or two F, cyclohexylen-1 ,4-diyl, biphenyl-4,4'-diyl,optionally substituted by one or two F per ring, 1 ,1'- cyclohexylphenyl-4,4'-diyl, the phenyl moiety optionally substituted by one or two F, or 1 ,1"-phenylcyclohexyl-4,4'-diyl, the phenyl moiety optionally substituted by one or two F, or 1 ,1'-bicyclohexyl-4,4'-diyl, pyrimidin-2,5-diyl, or pyridin-2,5-diyl, optionally ortho to N substituted by F, with the provisos
  • Yet another object of the invention is to provide a liquid crystal mixture comprising at least 1 compound of formula (IV)
  • R 1 to R 6 , A, M 2 and m have the meanings as in formula (I) and M 1 is a single bond.
  • a further object of the invention is to provide a liquid crystal display device, especially one operated in an active matrix panel using the above described mixtures.
  • a further object of the invention is to provide a chiral smectic liquid crystal display device, especially one operated in an active matrix panel using the above described mixtures.
  • a further object of the invention is to provide a ferroelectric liquid crystal display device, especially one operated in an active matrix panel using the above described mixtures.
  • this display is a monostable ferroelectric display, such as half-V-shape, CDR or short pitch FLC displays.
  • a further object of the invention is to provide an antiferroelectric liquid crystal display device, especially one operated in an active matrix panel using the above described mixtures.
  • this display is a monostable antiferroelectric display, such as the so-called "V-shape" mode.
  • a further object of the invention is to provide a nematic liquid crystal display device, especially one operated in an active matrix panel using the above described mixtures.
  • Yet a further object of the invention is the use of the above described mixtures in a liquid crystal display, especially one operated in an active matrix panel, especially if the liquid crystal is a chiral smectic, particularly a monostable chiral smectic mode.
  • liquid crystal mixtures according to the invention are prepared in a manner which is customary per se. As a rule the components are dissolved in one another, advantageously at elevated temperatures.
  • the liquid crystal mixtures according to the invention generally comprises of at least two (2), preferably at least five (5), particularly at least eight (8) compounds.
  • Optional additional constituents of the mixtures according to invention are materials that increase the light stability (UV stabilizers, e.g. of the "benzophenone” or “benzotriazole” type).
  • the mixtures may comprise 0.01 wt.-% to 10 wt.-% of one or several UV stabilizers; especially prefered are mixtures containing 0.1 wt.-% to 5 wt.-% of one or several UV stabilizers.
  • additional constitutents of the mixtures according to invention are materials that increase the stability against oxidative degradation (antioxidants, e.g. of the "sterically hindered phenol" type).
  • the mixtures may comprise 0.01 wt.-% to 10 wt.-% of one or several antioxidants; especially prefered are mixtures comprise 0.1 wt.-% to 5 wt.-% of one or several antioxidants.
  • the mixtures according to invention may comprise a combination of UV stabilizers and antioxidants.
  • the mixtures according to the invention can be used in electro-optical or fully optical elements, for example display elements, switching elements, light modulators, shutters, elements for image processing and/or signal processing or generally in the area of nonlinear optics.
  • Chiral smectic liquid crystal mixtures according to the invention are particularly suitable for use in electro-optical switching and display devices (displays). These displays are usually constructed in such a way that a liquid crystal layer is enclosed on both sides by layers which are usually, in this sequence starting from the LC layer, at least one alignment layer, electrodes and a limiting sheet (for example of glass). In addition, they contain spacers, adhesive frames, polarizers and, for color displays, thin color-filter layers or are operated in the sequential backlight technique. Other possible components are antireflection, passivation, compensation and barrier layers and, for active-matrix displays, electric non-linear elements, such as thin-film transistors (TFTs) and metal-insulator-metal (MIM) elements.
  • TFTs thin-film transistors
  • MIM metal-insulator-metal
  • the present invention further provides a chiral smectic liquid crystal (FLC) display device comprising the above-mentioned liquid crystal mixture of the present invention between a pair of substrates each comprising an electrode and an alignment layer formed thereon.
  • FLC chiral smectic liquid crystal
  • the FLC display is operated in the monostable mode with active matrix panel.
  • the present invention further provides a nematic liquid crystal display device comprising the above-mentioned liquid crystal mixture of the present invention between a pair of substrates each comprising an electrode and an alignment layer formed thereon.
  • the display is operated in the ECB mode (EP-A 0474062).
  • IPS mode Korean et al., Japan Display '92, S.547) or VA mode (Ohmura et al., SID 97 Digest, S.845).
  • a solution of LQT 120 (Hitachi Kasei) is applied onto glass substrates with ITO by spin coating at 2500 rpm.
  • the substrates are heated at 200°C for 1 hour to form a film.
  • the substrates are assembled into a cell with spacers having a thickness of 2.0 ⁇ m inserted between the substrates in such a manner that the rubbing directions are anti- parallel to each other.
  • the properties of the liquid crystal mixture are measured by filling the liquid crystal mixture into the cell in the isotropic phase, cooling progressively through the nematic, (smectic A phase in case the liquid crystal mixture has one) and the smectic C phase and then applying a rectangular wave pulse (60 Hz) with varying applied voltage (0 to 10V) to the cell at 25°C. Resistivity and ion-induced spontaneous polarization are measured by means of a MTR-1 device (Toya Technica). Table 1 summarizes the results thus obtained by adding small quantities of several types of (I) to S c mixture A and B, respectively.
  • the mixtures according to invention surprisingly exhibit a higher resisitivity and decreased ion content. Hence the mixtures according to invention can find application in active- matrix devices.
  • 2,2,6,6-Tetramethyl-piperidine-4-(4-octyloxy)benzoate was obtained by esterifying 4-hydroxy-2,2,6,6-tetramethyl-piperidine with 4-octyloxybenzoyl chloride in analogy to US-A-4 038 280; m.p. 79 - 81 °C.
  • 2,2,6,6-Tetramethyl-piperidine-4-(4-hexyl)benzoate was obtained in analogy to RO 92779 B1 (CAN 109:171562) by heating a xylene solution of methyl 4-hexylbenzoate, 4-hydroxy-2,2,6,6-tetramethylpiperidine and sodium methanolate to reflux for 10 hrs.
  • Silica treatment and recrystallization rendered pure material of m.p. 61 - 62°C.
  • 2,2,6,6-Tetramethylpiperidine-4-(4 ' -heptylbiphenyl-4-yl)carboxylate was obtained in analogy to example 13 by subjecting methyl 4 ' -heptylbiphenyl-4-carboxylate to the reaction with 4-hydroxy-2,2,6,6-tetramethylpiperidine; m.p. 106 - 107°C.
  • Example 15 1,2,2,6,6-Pentamethyl-4-[trans-4-(4-propylcyclohexyl)phenyl]piperidine was obtained in analogy to Skowronski et al., Pol.J.Chem. 54,195,(1980) by reacting in tetrahydrofurane 1 ,2,2,6,6-pentamethyl-piperidine-4-one with the Grignard reagent prepared from 4-(trans-4-propylcyclohexyl)bromobenzene, subjecting the crude reaction product to azeotropic dehydration to 3,4-dehydro-1 ,2,2,6,6-pentamethyl-4- [trans-4-(4-propylcyclohexyl)phenyl]piperidine and hydrogenation in tetrahydrofuran, catalyzed by Pd / C, at ambient temperature and atmospheric pressure, followed by silica treatment, as a viscous liquid.
  • Table 2 summarizes the results - (achieved with the equipment and procedure of examples 1 to 6) obtained by adding small quantities of several types of (I) to one of the following S c mixtures: M1 ⁇ achiral block mixture based on 5-alkyl-2-(4-alkyloxyphenyl)pyrimidines ⁇ M2 (chiral mixture based on derivatives of phenylpyrimidines) M3b (achiral multi-component mixture based on ester and ether derivatives of phenylpyrimidines, fluorinated bi- and terphenyls and sulfur heterocycles) M3 (like M3b, but chiral dopant added)
  • the mixtures according to invention surprisingly exhibit a substantially lower ion content [nC/cm 2 ] over a longer period of time.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Liquid Crystal Substances (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Pyridine Compounds (AREA)
PCT/EP2001/009832 2000-08-30 2001-08-25 Liquid crystal mixture Ceased WO2002018515A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2002524018A JP5269279B2 (ja) 2000-08-30 2001-08-25 液晶混合物
EP01969650A EP1319054B1 (en) 2000-08-30 2001-08-25 Liquid crystal mixture
DE60109466T DE60109466T2 (de) 2000-08-30 2001-08-25 Flüssigkristallmischung
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KR20080023367A (ko) 2008-03-13
KR100890345B1 (ko) 2009-03-25
US6958176B2 (en) 2005-10-25
EP1319054B1 (en) 2005-03-16

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