WO2012013281A1 - Flüssigkristallines medium enthaltend thiophenderivate - Google Patents
Flüssigkristallines medium enthaltend thiophenderivate Download PDFInfo
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- WO2012013281A1 WO2012013281A1 PCT/EP2011/003271 EP2011003271W WO2012013281A1 WO 2012013281 A1 WO2012013281 A1 WO 2012013281A1 EP 2011003271 W EP2011003271 W EP 2011003271W WO 2012013281 A1 WO2012013281 A1 WO 2012013281A1
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- 0 *C1COC(c2ccc(-c(cc3)cc(F)c3-c3ccc(*)[s]3)c(F)c2)OC1 Chemical compound *C1COC(c2ccc(-c(cc3)cc(F)c3-c3ccc(*)[s]3)c(F)c2)OC1 0.000 description 9
- RJHFYYMQAHTWPW-UHFFFAOYSA-N CCCC(CC1)CCC1c1cc(F)c(-c2ccc(CC)[s]2)c(F)c1 Chemical compound CCCC(CC1)CCC1c1cc(F)c(-c2ccc(CC)[s]2)c(F)c1 RJHFYYMQAHTWPW-UHFFFAOYSA-N 0.000 description 1
- WVSFYQJOKNIGRU-UHFFFAOYSA-N CCCc(cc1)ccc1-c(cc1F)cc(F)c1Br Chemical compound CCCc(cc1)ccc1-c(cc1F)cc(F)c1Br WVSFYQJOKNIGRU-UHFFFAOYSA-N 0.000 description 1
- BJNSEVYWWJWPJX-UHFFFAOYSA-N CCCc(cc1)ccc1-c1cc(F)c(-c2ccc(C=C)[s]2)c(F)c1 Chemical compound CCCc(cc1)ccc1-c1cc(F)c(-c2ccc(C=C)[s]2)c(F)c1 BJNSEVYWWJWPJX-UHFFFAOYSA-N 0.000 description 1
- YJSNJQSUPJYSSV-UHFFFAOYSA-N CCCc(cc1)ccc1-c1cc(F)c(-c2ccc(CC)[s]2)c(F)c1 Chemical compound CCCc(cc1)ccc1-c1cc(F)c(-c2ccc(CC)[s]2)c(F)c1 YJSNJQSUPJYSSV-UHFFFAOYSA-N 0.000 description 1
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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
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- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/34—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring
- C09K19/3491—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having sulfur as hetero atom
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- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
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- C09K19/00—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
- C09K19/10—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-)
- C09K2019/122—Ph-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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- C09K19/00—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)
- C09K2019/3025—Cy-Ph-Ph-Ph
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- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
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- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
Definitions
- the present invention relates to liquid-crystalline media (FK media) with thiophene derivatives and liquid crystal displays (FK displays) containing these LC media.
- the media have a high optical anisotropy and preferably have a content of 25% by weight or more of thiophene derivatives.
- Liquid crystals are mainly used as dielectrics in display devices, since the optical properties of such substances can be influenced by an applied voltage. Electro-optical devices based on liquid crystals are well known to the person skilled in the art and can be based on various effects.
- Such devices include, for example, dynamic scattering cells, DAP cells (upright phase deformation), GastA / Virt cells, twisted nematic (TN) cells, super-twisted nematic (STN) cells, SBE cells ("superbirefringence effect”) and OMI cells ("optical mode interference").
- DAP cells upright phase deformation
- GastA / Virt cells twisted nematic (TN) cells
- STN super-twisted nematic
- SBE cells super-twisted nematic
- OMI cells optical mode interference
- I PS cells in-plane switching
- TN, STN and IPS cells in particular the TN, STN and IPS cells are currently commercially interesting
- the liquid crystal materials need a good chemical and
- liquid crystal materials have thermal stability and good stability against electric fields and electromagnetic radiation. Further, the liquid crystal materials should have low viscosity and provide short response times, low threshold voltages, and high contrast in the cells.
- liquid crystals are generally used as mixtures of several components, it is important that the components are readily miscible with each other.
- the individual compounds should have a high solubility in a typical mixture, also called host.
- Other properties, such as electrical conductivity, dielectric anisotropy and optical anisotropy, must be determined according to cell type and field of application
- Materials for cells with twisted nematic structure have a positive dielectric anisotropy and a low electrical conductivity.
- Such matrix liquid crystal displays are known.
- active elements i.e., transistors
- non-linear elements for individual switching of the individual pixels.
- active matrix whereby one can distinguish two types:
- MOS Metal Oxide Semiconductor
- TFT Thin-film transistors
- the TN effect is usually used as the electro-optic effect.
- TFTs made of compound semiconductors such as CdSe or TFTs based on polycrystalline or amorphous Silicon The latter technology is being worked on worldwide with great intensity.
- the TFT matrix is applied on the inside of one glass plate of the display, while the other glass plate on the inside carries the transparent counter electrode. Compared to the size of the pixel electrode, the TFT is very small and practically does not disturb the image.
- This technology can also be extended to fully color-capable image representations, wherein a mosaic of red, green and blue filters is arranged such that each one filter element is opposite to a switchable image element.
- the TFT displays usually operate as TN cells with crossed polarizers in transmission and are backlit.
- MFK displays are particularly suitable for TV applications (eg pocket TV) or for high-information displays for computer applications (laptop) and in the automotive or aircraft.
- MFK displays have difficulties due to the insufficiently high resistivity of the liquid-crystal mixtures [TOGASHI, S., SEKIGUCHI, K., TANABE, H., YAMAMOTO, E., SORIMACHI, K. , TAJIMA, E., WATANABE, H., SHIMIZU, H., Proc. Eurodisplay 84, Sept. 1984: A 210-288 Matrix LCD Controlled by Double Stage Diode Rings, p.
- the resistivity shows the smallest possible increase with increasing temperature and after temperature and / or UV exposure.
- the low-temperature properties of the mixtures of the prior art It is required that no crystallization and / or smectic phases occur even at low temperatures, and that the temperature dependence of the viscosity is as low as possible.
- the MFK displays from the prior art thus do not meet today's requirements.
- MFK displays with low switching times are required. Such low switching times can be realized especially when liquid-crystal media having low values for the viscosity, in particular the rotational viscosity ⁇ , are used.
- diluting additives usually reduce the clearing point and thus the operating temperature range of the medium.
- the clearing point, the dielectric anisotropy ⁇ or the birefringence ⁇ to deteriorate.
- in particular low rotational viscosities are desirable.
- Birefringence values typically also have higher values of
- Autostereoscopic displays consisting of a switchable 2-D display and switchable optical elements that can switch between a 2-D and a 3-D mode are used.
- the lenses designed as switchable lenticular lenses, fan out the pixel contents of the 2-D display into the room.
- Each fan element contains the information of a 3-D content from a certain viewing angle. If both eyes of the viewer lie in adjacent compartments, the viewer perceives a spatial stereoscopic image.
- the switchable lens can be realized as a liquid crystal GRIN lens (gradient index lens 1 , gradient-index lens) or as a liquid crystal replica lens.
- a high optical birefringence of the FK medium used is desirable.
- the invention has for its object to provide media especially for such MFK, TN, STN or IPS displays, which have the above-mentioned desired properties and not or only to a lesser extent show the disadvantages mentioned above.
- the LC media should have fast switching times and low Have rotational viscosities at the same time high dielectric anisotropy and high birefringence.
- the LC media should have a high clearing point, a broad nematic phase range, and a low threshold voltage.
- the present invention thus relates to an LC medium containing one or more compounds of the formula I.
- the individual radicals have the following meaning
- A is independently phenylene-1, 4-diyl, in which also one or two CH groups may be replaced by N and one or more H atoms by halogen, CN, CH 3 , CHF 2 , CH 2 F, OCH 3l OCHF 2 or OCF 3 can be replaced,
- Cyclohexane-1,4-diyl in which also one or two non-adjacent CH 2 groups can be replaced independently of one another by O and / or S, and one or more H atoms can be replaced by F, cyclohexene-1, 4- diyl, bicyclo [1.1.1] pentane-1,3-diyl, bicyclo [2.2.2] octane-1, 4-diyl, spiro [3.3] heptane-2,6-diyl, tetrahydropyran-2,5-diyl, or 1, 3-dioxane-2,5-diyl, m is 0, 1, or 2, preferably 1 or 2, particularly preferably 1.
- a preferred subject matter of the invention is an LC medium which has a, preferably achiral, nematic phase at room temperature, containing one or more compounds of the formula I.
- the media have a high optical anisotropy and preferably have a content of 25% by weight or more on thiophene derivatives.
- Another object of the invention is the use of
- Another object of the invention is an LC display or an electro-optical device containing one or more compounds of formula I (preferably 25% by weight or more) or a FK medium according to the invention.
- it is an MFK, TN, STN or IPS display or an electro-optical switchable lens or shutter, preferably for a FK display, camera, printer or exposure apparatus.
- the medium preferably contains 25-80% by weight, preferably 30% by weight or more, and more preferably 40% by weight or more
- the rings A 1 in formula I are particularly preferably phenylene-1, 4-diyl, which may also be monosubstituted or polysubstituted by F.
- a 1 in formula I is a radical of the formula
- R and R 2 each independently of one another are unbranched alkyl, alkenyl or alkynyl having 1 to 8, preferably 1 to 5, C atoms. Most preferably, R 1 is alkyl.
- R 1 , R 2 is
- R 1 and R 2 are substituted alkyl, alkoxy, alkenyl or alkynyl, the total number of C atoms in both groups R 1 and R 2 is preferably less than 10.
- Preferred alkyl groups are, for example, methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, n-heptyl and n-octyl.
- Preferred alkenyl groups are, for example, ethenyl, propenyl, butenyl and pentenyl.
- Preferred alkynyl groups are, for example, ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl and octynyl.
- Preferred alkoxy groups are, for example, methoxy, ethoxy, n-propoxy, n-butoxy, n-pentoxy, n-hexoxy, n-heptoxy, n-octoxy.
- Halogen is preferably F or Cl.
- Particularly preferred compounds of the formula I are those selected from the following sub-formulas
- R 1 and R 2 have the meanings given above and below.
- R and R 2 therein are preferably optionally fluorinated alkyl, alkenyl, alkynyl or alkoxy having 1 to 12 C atoms, more preferably optionally fluorinated alkyl, alkenyl or alkynyl having 1 to 6 carbon atoms.
- the compounds of the formula 11 to I37 are particularly preferred, in particular the compounds 11 to I27, and especially the compounds of the formula 16, owing to the high dielectric anisotropy in relation to the viscosity.
- a 1, 4-phenylene or trans-1,4-cyclohexylene, a is 0 or 1
- R 3 is alkyl or alkenyl having 1 to 8 or 2 to 9 carbon atoms, preferably alkenyl
- the compounds of the formula II are preferably selected from the group consisting of the following formulas:
- R and R are each independently H, CH 3 , C 2 H 5 or C 3 H 7, and "alkyl" is a straight-chain alkyl group having 1 to 8, preferably 1, 2, 3, 4 or 5 C atoms.
- R 3a is H or CH 3 , preferably H
- compounds of the formula IIc in which R 3a and R 4a are H, CH 3 or C 2 H 5 .
- the compounds of the formula III are preferably selected from the group consisting of the following formulas:
- alkyl and R 3a have the meanings given above and R 3a is preferably H or CH 3 .
- R 3a is preferably H or CH 3 .
- Particular preference is given to compounds of the formula IIIb; FK medium additionally containing one or more compounds selected from the group consisting of the following formulas:
- R 0 is an alkyl or alkoxy radical having 1 to 15 carbon atoms, wherein in these radicals also one or more CH 2 groups each independently through -CF 2 0-,
- Y 1-6 are each independently H or F
- R ° is preferably straight-chain alkyl or alkenyl, each having up to 6 C atoms.
- the compounds of formula IV are preferably selected from the group consisting of the following formulas:
- R ° and X ° have the meanings given above.
- R ° is preferably alkyl or alkenyl.
- X ° is preferably Cl, furthermore F.
- the compounds of formula V are preferably selected from the group consisting of the following formulas:
- R 0 and X 0 have the meanings given above.
- R 0 in formula V is alkyl having 1 to 8 C atoms and X 0 F;
- Y 1 is preferably F, most preferably those selected from the group consisting of the following formulas:
- R ° and X ° have the meanings given above.
- R ° in formula VI is alkyl having 1 to 8 C atoms and X ° F, furthermore OCF 3 .
- R ° and X ° have the meanings given above.
- R ° in formula VI is alkyl having 1 to 8 C atoms and X ° F;
- LC medium which preferably contains one or more compounds of the formula VII in which Z is -CF 2 O-, -CH 2 CH 2 or -COO-, particularly preferably those selected from the group consisting of the following formulas:
- R ° and X ° have the meanings given above.
- the compounds of formula VIII are preferably selected from the group consisting of the following formulas:
- R ° and X ° have the meanings given above.
- R ° is a straight-chain alkyl radical having 1 to 8 C atoms.
- X ° is preferably F.
- R °, X °, Y and Y 2 have the abovementioned meaning, and in each case independently of one another where rings A and B are not both simultaneously cyclohexylene;
- the compounds of formula IX are preferably selected from the group consisting of the following formulas:
- R ° and X ° have the meanings given above.
- R ° is alkyl having 1 to 8 C atoms and X ° F.
- Particular preference is given to compounds of the formula IXa; FK medium additionally containing one or more compounds selected from the group consisting of the following formulas:
- R °, X ° and Y 1 "4 have the meanings given above, and each independently mean;
- the compounds of the formulas X and XI are preferably selected from the group consisting of the following formulas:
- R ° is alkyl having 1 to 8 C atoms and X ° F.
- Particularly preferred compounds are those in which Y 1 is F and Y 2 is H or F, preferably F;
- R 5 and R 6 are each independently n-alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl each having up to 9 C-atoms, and preferably each independently of one another are alkyl having 1 to 8 C-atoms.
- Y 1 "3 is independently H or F. Preferably, one or two of Y 1 3 are F.
- Preferred compounds of the formula XII are those selected from the group consisting of the following formulas:
- Alkyl and alkyl * each independently a straight-chain alkyl radical having 1 to 6 carbon atoms
- Alkenyl and Alkenyl * each independently represent a straight-chain alkenyl radical having 2 to 6 carbon atoms.
- alkyl has the abovementioned meaning and denotes RH or CH 3 .
- FK medium additionally containing one or more compounds selected from the group consisting of the following formulas:
- R °, X °, Y and Y have the meanings given above.
- R ° is alkyl of 1 to 8 carbon atoms and X is F or Cl;
- R ° and X ° have the meanings given above.
- R ° is alkyl having 1 to 8 carbon atoms.
- X ° is preferably F or Cl.
- LC medium which additionally contains one or more compounds of the formula D1 and / or D2:
- R ° is alkyl having 1 to 8 C atoms and X ° F.
- Particular preference is given to compounds of the following formulas:
- R ° has the meanings given above and is preferably straight-chain alkyl having 1 to 6 C atoms, in particular C 2 H 5 , n-C3H7 or nC 5 H means.
- Y 1 , R 1 and R 2 have the meaning given above.
- R and R 2 are each independently of one another alkyl having 1 to 8 C atoms;
- LC medium which additionally contains one or more compounds of the following formula:
- R has the meaning given above and is preferably H
- FK medium which additionally contains one or more tetranuclear compounds selected from the group consisting of
- Formulas XIX to XXV contains:
- ⁇ 1 "4 , R ° and X ° each independently have one of the meanings given above X ° is preferably F, Cl, CF 3 , OCF 3 or OCHF 2.
- R ° is preferably alkyl, alkoxy, oxaalkyl, fluoroalkyl or Alkenyl, each with up to 8 carbon atoms.
- LC medium which additionally contains one or more compounds of the following formula: in which R °, X ° and Y 1 "have the abovementioned meanings Particular preference is given to compounds of the following formula:
- FK medium which additionally contains one or more compounds of the following formula:
- R ° has the meaning given above and is preferably alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, each having up to 8 carbon atoms.
- R ° has the abovementioned meaning and is preferably straight-chain alkyl having 2-5 C atoms, and d is 0 or 1,
- R 1 , R 1 and R 2 have the meaning given above.
- R 1 and R 2 are each independently of one another alkyl having 1 to 8 C atoms.
- Y 1 is preferably F.
- Preferred mixtures contain 1-15% by weight, in particular 1-10% by weight, of these compounds.
- R ° is preferably straight-chain alkyl or alkenyl having 2 to 7 C atoms
- X ° is preferably F, furthermore OCF 3, Cl or CF 3 ;
- the medium preferably contains two or more, more preferably three or more compounds of the formula I or selected from the formulas II to I53;
- the medium preferably contains one or more compounds selected from the group of the compounds of the formulas II, III, VI-2, XI, XII, XIII, XIV, XXIV, XXV, XXVI, XXVII and XXIX.
- the medium preferably contains at least 25% by weight
- XXIX in particular XII, XIII, XIV, XV, XXV and XXIX (give, for example, advantageously high ⁇ values);
- the medium preferably contains one or more in each case
- Total mixture is preferably at least 20% by weight
- the medium preferably contains at least 25% by weight, particularly preferably 30-70% by weight, of compounds of the formula II and / or III;
- the medium preferably contains 5-50% by weight, more preferably 25-60% by weight, of compounds of the formula IIa, in particular in which R 3a is H;
- the medium preferably contains 2-20% by weight, more preferably 3-15% by weight, of compounds of the formula VI-2;
- the medium contains 2-20% by weight, more preferably 3-15% by weight, of compounds of the formula XI;
- the medium preferably contains 1-20% by weight, more preferably 2-15% by weight of compounds of formula XXIV;
- the medium preferably contains 1-20% by weight, more preferably 2-15% by weight, of compounds of the formula XXV;
- the medium preferably contains 1-25% by weight, more preferably 2-20% by weight, of compounds of the formula XXVI;
- the medium preferably contains 1-35% by weight, more preferably 5-30% by weight, of compounds of the formula XXVII;
- the medium preferably contains one or more compounds selected from the group of the compounds of the formulas VI-2, VII-1a, VII-1 b, IX, X, XI and XXVI (CF 2 O-bridged compounds).
- straight-chain and branched alkyl groups having 1-7 carbon atoms in particular the straight-chain groups methyl, ethyl, propyl, butyl, pentyl, hexyl and heptyl.
- Groups of 1-6 carbon atoms are generally preferred.
- alkenyl or "alkenyl *" in this application includes straight-chain and branched alkenyl groups having 2-7 carbon atoms, in particular the straight-chain groups.
- Preferred alkenyl groups are C 2 -C 7 -I E-alkenyl, C 4 -C 7 -EE-alkenyl, C 5 -C 7 -alkenyl, C 6 -C 7 -5-alkenyl and C 7 -6-alkenyl, in particular C2-C 7 -1 e-alkenyl, C 4 -C -3E-alkenyl and C 5 -C 7 -4-alkenyl.
- alkenyl groups are vinyl, 1E-propenyl, 1E-butenyl, 1E-pentenyl, 1E-hexenyl, 1E-heptenyl, 3-butenyl, 3E-pentenyl, 3E-hexenyl, 3E-heptenyl, 4-pentenyl .
- fluoroalkyl in this application includes straight-chain groups having at least one fluorine atom, preferably one
- fluorine i. Fluoromethyl, 2-fluoroethyl, 3-fluoropropyl, 4-fluorobutyl, 5-fluoropentyl, 6-fluorohexyl and 7-fluoroheptyl. Other positions of the fluorine are not excluded.
- halogenated alkyl preferably includes mono- or polyfluorinated and / or chlorinated radicals. Perhalogenated radicals are included. Particularly preferred are fluorinated alkyl radicals, in particular CF 3> CH 2 CF 3) CH 2 CHF 2 , CHF 2l CH 2 F, CHFCF 3 and
- R ° is an alkyl radical and / or an alkoxy radical, this may be straight-chain or branched. It is preferably straight-chain, has 2, 3, 4, 5, 6 or 7 carbon atoms and accordingly preferably denotes ethyl, propyl, butyl, pentyl, hexyl, heptyl, ethoxy, propoxy, butoxy, pentoxy, hexoxy or heptoxy, furthermore methyl, Octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, methoxy, octoxy, nonoxy, decoxy, undecoxy, dodecoxy, tridecoxy or tetradedoxy.
- 6-oxaheptyl 2-, 3-, 4-, 5-, 6-, or 7-oxo-octyl, 2-, 3-, 4-, 5-, 6-, 7- or 8-oxanonyl, 2-, 3 -, 4-, 5-, 6-, 7-, 8- or 9-oxadexyl.
- It is preferably straight-chain and has 2 to 10 C atoms. It therefore means especially vinyl, prop-1, or prop-2-enyl, but-1, 2- or but-3-enyl, pent-1, 2-, 3- or pent-4-enyl, hex 1-, 2-, 3-, 4- or hex-5-enyl, hept-1, 2-, 3-, 4-, 5- or hept-6-enyl, Oct-1, 2-, 3-, 4-, 5-, 6- or oct-7-enyl, non-1-, 2-, 3-, 4-, 5-, 6-, 7- or ⁇ -8-enyl, Dec-1 -, 2-, 3-, 4-, 5-, 6-, 7-, 8- or dec-9-enyl. These radicals can also be mono- or polyhalogenated.
- R ° is an alkyl or alkenyl radical which is at least monosubstituted by halogen
- this radical is preferably straight-chain and halogen is preferably F or Cl.
- halogen is preferably F.
- the resulting radicals also include perfluorinated radicals.
- the fluoro or chloro substituent may be in any position, but preferably in the ⁇ position.
- X ° is preferably F, Cl or a mono- or polyfluorinated alkyl or alkoxy radical having 1, 2 or 3 C atoms or a mono- or polyfluorinated alkenyl radical having 2 or 3 C atoms.
- X ° is particularly preferably F, Cl, CF 3 , CHF 2 , OCF 3 , OCHF 21 OCFHCF 3 , OCFHCHF 2 , OCFHCH 2 F, OCF 2 CH 3 , OCF 2 CHF 2 , OCF 2 CH 2 F, OCF 2 CF 2 CHF 2 , OCF 2 CF 2 CH 2 F, OCFHCF 2 CF 3 , OCFHCF 2 CHF 2 ,
- R ° and X ° By suitable choice of the meanings of R ° and X °, the response times, the threshold voltage, the transconductance of the transmission characteristics etc. can be modified as desired.
- 1 E-alkenyl radicals, 3E-alkenyl radicals, 2E-alkenyloxy radicals and the like usually lead to shorter response times, improved nematic tendencies and a higher ratio of the elastic constants k 33 (bend) and kn (splay) compared to alkyl or
- Mixtures are characterized in particular by high K values and thus have significantly faster switching lines than the mixtures from the prior art.
- the optimum ratio of the compounds of the abovementioned formulas largely depends on the desired properties, on the choice of the components of the abovementioned formulas and on the choice of further components which may optionally be present.
- Range can be easily determined on a case-by-case basis.
- the total amount of compounds of the above formulas in the mixtures according to the invention is not critical.
- the mixtures may therefore contain one or more other components for the purpose of
- the invention also electro-optical displays, such. B. TN, STN, TFT, OCB, IPS, FFS or MFK displays with two plane-parallel support plates, which form a cell with a border, integrated non-linear elements for switching individual pixels on the support plates and a in-cell nematic liquid crystal composition having positive dielectric anisotropy and high resistivity) containing such media and the use of these media for electro-optical purposes.
- liquid-crystal mixtures according to the invention enable a significant expansion of the available parameter space.
- the mixtures according to the invention are especially for mobile
- the liquid-crystal mixtures according to the invention make it possible, while maintaining the nematic phase to -20 ° C and preferably to -30 ° C, particularly preferably to -40 ° C, and the clearing point> 70 ° C, preferably> 75 ° C, simultaneously rotational viscosities ⁇ of ⁇ 100 mPa s, more preferably ⁇ 70 mPa s, resulting in excellent MFK displays with fast switching times.
- the dielectric anisotropy of the liquid-crystal mixtures ⁇ according to the invention is preferably> +3, more preferably> +5.
- the mixtures are also characterized by small operating voltages.
- the threshold voltage of the invention is preferably> +3, more preferably> +5.
- Liquid crystal mixtures is preferably ⁇ 2 V, in particular ⁇ 1.5 V.
- the birefringence ⁇ of the liquid-crystal mixtures according to the invention is preferably> 0.11, particularly preferably> 0.14.
- the nematic phase range of the liquid-crystal mixtures according to the invention is preferably at least 80 °, in particular at least 90 ° wide. Preferably, this range extends at least from -20 ° C to +70 ° C.
- the MFK displays according to the invention preferably operate in the first transmission minimum according to Gooch and Tarry [CH Gooch and HA Tarry, Electron. Lett. 10, 2-4, 1974; CH Gooch and HA Tarry, Appl. Phys., Vol. 8, 1575-1584, 1975], which in addition to particularly favorable electro-optical properties, such as high slope of the curve and low angle dependence of the contrast (DE-PS 30 22 818) at the same threshold voltage as in an analog display in second minimum, a smaller dielectric Anisotropy is sufficient.
- the LC media are preferably too
- the light stability and UV stability of the mixtures according to the invention is considerably better, i. they show a much smaller decrease in HR under light or UV exposure. Even low concentrations of the compounds ( ⁇ 10% by weight) of the formula I in the mixtures increase the HR by 6% or more compared to mixtures of the prior art.
- the LC media may also other known to the expert and described in the literature additives such.
- UV stabilizers such as Tinuvin ® Fa. Ciba, antioxidants, radical scavengers, nanoparticles, etc. included.
- 0-15% pleochroic dyes or chiral dopants may be added.
- Suitable stabilizers and dopants are mentioned below in Tables C and D.
- FK media according to the invention may also contain compounds in which, for example, H, N, O, Cl, F are replaced by the corresponding isotopes.
- liquid crystal mixtures which can be used according to the invention are prepared in a conventional manner, for example by mixing one or more compounds of the formula I with one or more compounds of the formulas II-XXVIII or with further liquid-crystalline compounds and / or additives.
- the formula I is prepared in a conventional manner, for example by mixing one or more compounds of the formula I with one or more compounds of the formulas II-XXVIII or with further liquid-crystalline compounds and / or additives.
- the structure of the MFK display of polarizers, electrode base plates and electrodes with surface treatment according to the invention corresponds to the usual construction for such displays.
- the term of the usual construction is broad and includes all modifications and modifications of the MFK display, in particular matrix display elements based on poly-Si TFT or MIM.
- the LC media according to the invention contain one or more Compounds selected from the group consisting of compounds of Table A and B.
- Table C lists possible dopants which can be added to the LC media according to the invention.
- the LC media preferably contain 0 to 10% by weight, in particular 0.01 to 5% by weight and more preferably 0.1 to 3% by weight
- the LC media contain one or more dopants selected from the group consisting of compounds of Table C.
- Table D lists possible stabilizers which can be added to the LC media according to the invention.
- the LC media preferably contain 0 to 10% by weight, in particular 0.01 to 5% by weight and more preferably 0.1 to 3% by weight
- the LC media contain one or more stabilizers selected from the group consisting of compounds of Table D.
- V 0 threshold voltage V 0 threshold voltage
- capacitive [V] at 20 ° C V 0 threshold voltage
- temperatures such as the melting point T (C, N), the transition from the smectic (S) to the nematic (N) phase T (S, N) and the clearing point T (N, I), in degrees Celsius (° C).
- Mp means melting point
- bp clearing point.
- K crystalline state
- N nematic phase
- S smectic phase
- I isotropic phase.
- Root temperature means 20 ° C unless stated otherwise.
- Suspense voltage refers to the capacitive threshold (V 0 ), also called Freedehcksz threshold, unless explicitly stated otherwise
- the optical threshold for 10 % relative contrast Vi 0
- test cells used for measuring the capacitive threshold voltage V 0 and for Vi 0 are constructed from substrates consisting of sodium glass (sodalime glass) coated with polyimide orientation layers (Durimid 32 with thinner (70% NMP + 30% xylene) in the ratio 1: 4) Arch Chemicals are coated, which are rubbed antiparallel to each other and have amechanicalntilt of almost 0 degrees.
- the area of the transparent, almost square electrodes made of ITO is 1 cm 2 .
- a commercially available high-resolution LCR meter eg LCR meter 4284A from Hewlett Packard
- Example 1 2- (3,5-Difluoro-4'-propylbiphenyl-4-yl) -5-ethyl-thiophene (PUS-3-2)
- 2- (3,5-difluoro-4'-propyl) biphenyl-4-yl) -5-ethyl-thiophene (PUS-3-2) is prepared as described below:
- ⁇ 1 67 mPa ⁇ s
- the compound 2- (3,5-difluoro-4'-ethyl-biphenyl-4-yl) -5-propyl-thiophene (PUS-2-3) is prepared analogously to Example 2 from 4'-ethyl-3,5- difluoro-4-biphenylboronic acid and 2-bromo-5-propylthiophene.
- the compound 2- (4'-ethyl-2,6-difluoro-biphenyl-4-yl) -5-propyl-thiophene (SUP-3-2) is prepared analogously to Example 1 from 4'-ethyl-2,6- difluoro-4-biphenylboronic acid and 2-bromo-5-propylthiophene.
- the compound 2- (4'-ethyl-2,6-difluoro-biphenyl-4-yl) -5-ethylthiophene (SUP-2-2) is prepared analogously to Example 1 from 4'-ethyl-2,6- difluoro-4-biphenylboronic acid and 2-bromo-5-ethylthiophene.
- Example 8 2- ( 3,5-Difluoro-4'-propylbiphenyl-4-yl) -5-vinylthiophene (PUS-3-V)
- a nematic LC mixture according to the invention is formulated as follows
- a nematic LC mixture according to the invention is formulated as follows
- a nematic LC mixture according to the invention is formulated as follows
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Abstract
Description
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JP2013520992A JP5788508B2 (ja) | 2010-07-29 | 2011-07-01 | チオフェン誘導体を含有する液晶媒体 |
US13/812,743 US8906261B2 (en) | 2010-07-29 | 2011-07-01 | Liquid crystal medium containing thiophene derivatives |
KR1020137004966A KR101868648B1 (ko) | 2010-07-29 | 2011-07-01 | 티오펜 유도체를 함유하는 액정 매질 |
CN201180036766XA CN103038312A (zh) | 2010-07-29 | 2011-07-01 | 包含噻吩衍生物的液晶介质 |
EP11728788.8A EP2598604B1 (de) | 2010-07-29 | 2011-07-01 | Flüssigkristallines medium enthaltend thiophenderivate |
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JP (1) | JP5788508B2 (de) |
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Cited By (4)
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WO2012163470A1 (en) * | 2011-06-01 | 2012-12-06 | Merck Patent Gmbh | Liquid crystal medium and liquid crystal display |
EP4074808A1 (de) | 2021-04-13 | 2022-10-19 | Merck Patent GmbH | Flüssigkristallines medium |
WO2023180505A1 (en) | 2022-03-25 | 2023-09-28 | Merck Patent Gmbh | Liquid crystalline medium |
EP4261269A1 (de) | 2022-04-12 | 2023-10-18 | Merck Patent GmbH | Flüssigkristallines medium |
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TWI462992B (zh) * | 2011-04-18 | 2014-12-01 | Daxin Materials Corp | 液晶化合物 |
DE102015003602A1 (de) * | 2015-03-18 | 2016-09-22 | Merck Patent Gmbh | Flüssigkristalines Medium |
CN111902519A (zh) * | 2018-01-24 | 2020-11-06 | 日东电工株式会社 | 包含五元杂环的液晶组合物、反向模式聚合物分散的液晶元件以及相关的选择性可调光装置 |
CN110229679B (zh) * | 2018-03-06 | 2020-11-17 | 北京八亿时空液晶科技股份有限公司 | 一种液晶介质的自配向添加剂及其制备方法与应用 |
JP7414743B2 (ja) * | 2018-06-29 | 2024-01-16 | メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング | チオフェン化合物、液晶媒体、およびそれを含む液晶ディスプレイ |
JP2020055997A (ja) * | 2018-07-12 | 2020-04-09 | メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツングMerck Patent Gesellschaft mit beschraenkter Haftung | チオフェン化合物、液晶媒体、およびそれを含む液晶ディスプレイ |
CN112143507A (zh) | 2019-06-28 | 2020-12-29 | 默克专利股份有限公司 | Lc介质 |
CN112266794B (zh) * | 2020-09-30 | 2022-09-09 | 北京八亿时空液晶科技股份有限公司 | 一种含噻吩的液晶化合物及其制备方法和应用 |
EP4337745A1 (de) * | 2021-05-12 | 2024-03-20 | Merck Patent GmbH | Flüssigkristallines medium und elektronisches bauelement |
TW202405135A (zh) * | 2022-04-12 | 2024-02-01 | 德商馬克專利公司 | 液晶介質 |
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- 2011-07-01 CN CN201180036766XA patent/CN103038312A/zh active Pending
- 2011-07-01 DE DE102011106314A patent/DE102011106314A1/de not_active Withdrawn
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- 2011-07-01 JP JP2013520992A patent/JP5788508B2/ja active Active
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012163470A1 (en) * | 2011-06-01 | 2012-12-06 | Merck Patent Gmbh | Liquid crystal medium and liquid crystal display |
US10450509B2 (en) | 2011-06-01 | 2019-10-22 | Merck Patent Gmbh | Liquid crystal medium and liquid display |
EP4074808A1 (de) | 2021-04-13 | 2022-10-19 | Merck Patent GmbH | Flüssigkristallines medium |
WO2023180505A1 (en) | 2022-03-25 | 2023-09-28 | Merck Patent Gmbh | Liquid crystalline medium |
EP4261269A1 (de) | 2022-04-12 | 2023-10-18 | Merck Patent GmbH | Flüssigkristallines medium |
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KR20140002608A (ko) | 2014-01-08 |
EP2598604A1 (de) | 2013-06-05 |
JP2013537571A (ja) | 2013-10-03 |
US20130119312A1 (en) | 2013-05-16 |
KR101868648B1 (ko) | 2018-06-18 |
CN107011920B (zh) | 2021-06-22 |
TW201213516A (en) | 2012-04-01 |
CN107011920A (zh) | 2017-08-04 |
US8906261B2 (en) | 2014-12-09 |
JP5788508B2 (ja) | 2015-09-30 |
CN103038312A (zh) | 2013-04-10 |
DE102011106314A1 (de) | 2012-02-02 |
TWI513803B (zh) | 2015-12-21 |
EP2598604B1 (de) | 2015-11-25 |
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