WO1990011335A1 - Ferroelektrische flüssigkristalline mischungen - Google Patents
Ferroelektrische flüssigkristalline mischungen Download PDFInfo
- Publication number
- WO1990011335A1 WO1990011335A1 PCT/EP1990/000457 EP9000457W WO9011335A1 WO 1990011335 A1 WO1990011335 A1 WO 1990011335A1 EP 9000457 W EP9000457 W EP 9000457W WO 9011335 A1 WO9011335 A1 WO 9011335A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- alkyl
- integer
- optically active
- mol
- mixture
- Prior art date
Links
- 0 CC(*1(*)CC1)(N)OC(*)CO Chemical compound CC(*1(*)CC1)(N)OC(*)CO 0.000 description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N c1ccccc1 Chemical compound c1ccccc1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C09K19/345—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom the heterocyclic ring being a six-membered aromatic ring containing two nitrogen atoms
- C09K19/3458—Uncondensed pyrimidines
-
- 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
- C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K19/46—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing esters
-
- 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
- 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
- C09K19/586—Optically active dopants; chiral dopants
- C09K19/588—Heterocyclic compounds
Definitions
- Ferroelectric liquid crystals have recently been of interest as a display medium in electro-optical
- Liquid crystals in electro-optical displays become chiral, inclined-smectic phases such as S c phases
- Liquid crystal mixtures in electro-optical components require a uniform planar orientation of the liquid crystals in order to achieve a high contrast ratio. It has been shown that a uniform planar orientation in the S c phase can be achieved if the phase sequence of the liquid crystal mixture with decreasing temperature is:
- Isotropic ⁇ nematic ⁇ smectic A ⁇ smectic C. e.g. K. Flatischler et al., Mol. Cryst. Liq. Cryst. 131, 21 (1985); T. Matsumoto et al., P. 468-470, Proc. of the 6th Int. Display Research Conf., Japan Display,
- the condition must additionally be met that the pitch of the helix in the Phase is large, ie greater than 5 ⁇ m, and is very large in the N * phase, ie greater than 10 ⁇ m or infinite.
- Liquid crystal systems which should be as short as possible, depend on the rotational viscosity of the system ⁇ [mPas], the spontaneous polarization P s [nC / cm 2 ] and the electric field strength E [V / m] according to the relationship
- the ferroelectric display medium must be low-viscosity and have a high spontaneous polarization so that a short switching time is achieved.
- photochemical stability requires a small optical anisotropy ⁇ n, preferably ⁇ 0.13, and a slightly positive or preferably negative dielectric anisotropy ⁇ e.
- ferroelectric liquid crystal mixtures can be converted [L.M. Blinov et al., Sow. Phys. Usp. 27 (7), 492 (1984); L.A. Beresnew et al. , Ferroelectrics, 59
- C n H 2n + 1 and C x H 2x + 1 are straight-chain alkyl radicals in which n is an integer from 6 to 14 and x is an integer from 2 to 14, for liquid-crystalline,
- Mixtures are particularly suitable; of them at least 2 different compounds a 'and a "are mixed
- the mixtures according to DE 38 31 226.3 from compounds of the formula (I) are already very suitable as a matrix for ferroelectric liquid-crystalline mixtures. However, they still have a large optical ( ⁇ n) and a large positive dielectric ( ⁇ e) anisotropy. In addition, depending on the chain length n or x of the substituents, the nematic phase is still narrow.
- R 1 is an alkyl chain with 10 to 16 or an alkoxy chain with 8 to 14 C atoms and R 2 is an alkyl chain with 2 to 9 C atoms.
- R 3 is a branched or straight-chain alkyl radical having 7 to 16 carbon atoms or a straight-chain or branched alkoxy radical having 6 to 14
- m and p are independently integers from 6 to 14.
- amounts of about 10 to 25 mol% of the compound of type d or mixtures with compounds of type c are added, based on the
- l can be an integer from 2 to 14,
- n is an integer from 5 to 14 and
- l can be an integer from 2 to 14,
- p is an integer from 7 to 14 and
- r can be an integer from 4 to 14
- s is an integer from 6 to 14 and
- t can be an integer from 6 to 14
- R 2 straight-chain or branched (C 1 -C 12 ) alkyl
- non-adjacent CH 2 groups can be replaced by O and / or S atoms
- Y F, Cl, Br, CN or CF 3
- R 1 branched (C 3 -C 9 ) alkyl, benzyl or phenyl.
- the object of the present invention is to use particularly suitable dopants in liquid-crystalline
- Mixtures also contain a chiral, optically active component D as a dopant, which leads to a large pitch of the helix (pitch) in the N * phase of the mixture and which induces a high spontaneous polarization (P s ) even at a low concentration.
- D chiral, optically active component
- the invention thus also relates to
- the new invention thus comprises a ferroelectric liquid-crystalline mixture containing, as component A, at least two 5-alkoxy-2- (alkyloxyphenyl) pyrimidines of the general formula (I) (I),
- alkyl radicals are straight-chain alkyl radicals in which n denotes an integer from 6 to 14 and x denotes an integer from 2 to 14, and
- R 1 is an alkyl radical with 10 to 16 C atoms or an alkyloxy radical with 8 to 14 C atoms and R 2 is an alkyl radical with 2 to 9 C atoms, and
- R 3 is an alkyl chain with 7 to 16 carbon atoms or an alkyloxy chain with 6 to 14 carbon atoms and y is an integer from 4 to 14, and
- m and p are independently integers from 6 to 14, and optionally as component B an optically active compound from group a) optically active esters of ⁇ -chlorocarboxylic acids and
- optically active esters of 1,3-dioxolane-4-carboxylic acids d) optically active esters of oxirane-2-carboxylic acids and optionally containing, as component C, one or more carboxylic acid esters of the general formulas (V), (VI), (VII ), (VIII) and (IX)
- k is an integer from 6 to 14 and
- l can be an integer from 2 to 14,
- n is an integer from 5 to 14 and
- l can be an integer from 2 to 14,
- p is an integer from 7 to 14 and
- r can be an integer from 4 to 14
- s is an integer from 6 to 14 and
- t can be an integer from 6 to 14.
- R 2 straight-chain or branched (C 1 -C 12 ) alkyl
- R 1 branched (C 3 -C 9 ) alkyl, benzyl or phenyl
- Liquid crystal mixture also an optically active
- Component D contains one or more
- a ferroelectric LC mixture which contains 0.5 to 30 mol% of the optically active component D is preferred. Also preferred is a mixture which contains two dopants from groups D and B and in which the pitch of the helix induced in the nematic phase is approximately compensated for at a given temperature.
- Tetrahydrofuran-2carboxylic acid ester (X) of the following general structure (Xa) contains:
- R 2 is a straight-chain or branched alkyl or alkenyl radical having 6 to 12 carbon atoms, the one
- an FLC mixture which contains a chiral epoxyalkyl ether as component D.
- R 1 straight-chain or branched (C 1 -C 12 ) alkyl, where one or two non-adjacent CH 2 groups by O and / or
- A diazine-2,5-diyl or diazine-3,6-diyl
- R 2 , R 3 , R 4 independently of one another H, straight-chain
- R 5 is a straight-chain or branched alkyl or
- Alkylene radical with 6 to 12 carbon atoms the one
- R 1 C 1 -C 10 alkyl, one or two not
- neighboring CH 2 groups may be replaced by O.
- optically active esters of tetrahydrofuran carboxylic acid (X) with (R) configuration generate a positive spontaneous polarization and a positive Heiix sense of rotation in the mixtures according to the invention.
- Optically active 1,3-dioxolane-4-carboxylic acid esters with (R) -configuration are suitable for the compensation, since they generate a positive P s and a negative pitch so strong that only 1 part by weight of dioxolane derivative per 3 parts by weight of tetrahydrofuran carboxylic acid must be used.
- d 2 Likewise for pitch compensation in
- Mixtures according to the invention have a positive spontaneous polarization and a negative pitch, which is obtained by adding optically active oxirane-2-carboxylic acid esters (according to DE-A 3 718 174) with (2R, 3R) configuration
- This class of substances is particularly suitable for pitch compensation, since usually only 1 part by weight of oxirane carboxylic acid ester per 3
- Blends a negative pitch You are therefore for
- (2S, 3S) configuration also prefers the connections with (2S, 3R) configuration for pitch compensation
- Liquid crystal mixtures are the values for the spontaneous polarization P s [nC / cm 2 ]
- the P s values are determined by the method of H. Diamant et al. (Rev. Sei. Instr., 28, 30, 1957) measured, measuring cells with 2 ⁇ m electrode spacing and rubbed polyimide being used as an orientation layer.
- the measuring cell is positioned by turning it so that a photodiode
- the microscope illumination is regulated so that the
- Photodiode shows the same light intensity for all cells.
- the light intensity (bright state) changes and the contrast is calculated from the ratio of the light intensities of these states.
- the switching time ⁇ is determined by measuring the rise time of the light signal from 10 to 90% signal level.
- the switching voltage consists of rectangular pulses and is ⁇ 10 V / ⁇ m.
- the N * pitch was determined in wedge-shaped cells by the method of Grandjean-Cano [F. Grandjean, CR Acad, Sei, (Paris) 172, 71 (1921); R. Cano, Bull. Soc. Franc. Mineral. Crystallogr. XC, 333 (1967)].
- phase transition temperatures were determined using a polarizing microscope
- Texture changes determined. The determination of the
- Crystalline (X.) is in ° C and the values are between the
- claimed liquid-crystalline mixture which differs from the above-mentioned ferroelectric mixture only in that it contains no dopant, has the following phase ranges
- claimed liquid-crystalline mixture which differs from the above-mentioned ferroelectric mixture only in that it contains no dopant, has the following phase ranges
- Dopant combination e 1 has the following liquid-crystalline phase regions:
- this mixture has a spontaneous polarization of 18 nC-cm -2 , a contrast of 9 and at one
- this ferroelectric mixture has the
- a ferroelectric mixture consisting of the
- this mixture has a spontaneous polarization of 18 nC ⁇ cm -2 , and at a switching field of 10 V. ⁇ m -1
- the contrast of the measuring cell is 9.
- the melting point of this mixture is 1.5 ° C. below that of the mixture from Example 1b.
- the pitch of this mixture is greater than 40 ⁇ m at 90 ° C.
- this mixture has a spontaneous polarization of 19 nC-cm -2 , and a switching time of 32 ⁇ s at a field strength of 10 V ⁇ ⁇ m -1 .
- the melting point of this mixture is 4 ° C. below the melting point of the mixture from Example 1b).
- the pitch of this mixture is greater than 50 ⁇ m at 90 ° C.
- This blend has compared to the blend
- Example 5 has a switching time that is 13 ⁇ s shorter and has a higher spontaneous polarization with a lower total dopant concentration.
- 5-octyl-2- (4-heptonoyloxy-phenyl) pyrimidine 17.6 mol%
- 5-octyloxy-2- (4-hexyloxy-phenyl) pyrimidine 11.8 mol%
- ferroelectric mixture differs only in that it contains no dopant, the following
- the dopants also have the advantage that they lower the melting point.
- Dopant combination e 1 has the following liquid-crystalline phase regions:
- Example 12 A ferroelectric mixture of 9 components Mixture from Example 6b) 96.2 mol%
- Dopant combination e 1 has the following liquid-crystalline phase regions:
- this mixture has a spontaneous polarization of 5.8 nC ⁇ cm -2 , and at a field strength of 10 V. ⁇ m -1 a switching time of 114 ⁇ s.
- nematic phase is> 30 ⁇ m at a temperature of 80 ° C.
- this mixture has a spontaneous polarization of 10.3 nC ⁇ cm -2 , and a field strength of 10
- V ⁇ ⁇ m -1 a switching time of 76 ⁇ s.
- the pitch of this mixture is greater than 10 ⁇ m at a temperature of 80 ° C.
- ferroelectric mixture differs only in that it contains no dopant, the following
- the dopants therefore have the advantage that they also lower the melting point.
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Liquid Crystal Substances (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/761,813 US5378394A (en) | 1989-03-22 | 1990-03-21 | Ferroelectric liquid-crystalline mixtures |
DE59009244T DE59009244D1 (de) | 1989-03-22 | 1990-03-21 | Ferroelektrische flüssigkristalline mischungen. |
EP90904624A EP0464058B1 (de) | 1989-03-22 | 1990-03-21 | Ferroelektrische flüssigkristalline mischungen |
NO91913697A NO913697L (no) | 1989-03-22 | 1991-09-19 | Ferroelektriske flytende krystallblandinger. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3909355A DE3909355A1 (de) | 1989-03-22 | 1989-03-22 | Ferroelektrische fluessigkristalline mischungen |
DEP3909355.7 | 1989-03-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990011335A1 true WO1990011335A1 (de) | 1990-10-04 |
Family
ID=6376915
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1990/000457 WO1990011335A1 (de) | 1989-03-22 | 1990-03-21 | Ferroelektrische flüssigkristalline mischungen |
Country Status (7)
Country | Link |
---|---|
US (1) | US5378394A (de) |
EP (1) | EP0464058B1 (de) |
JP (1) | JPH04504272A (de) |
CA (1) | CA2049960A1 (de) |
DE (2) | DE3909355A1 (de) |
TW (1) | TW208067B (de) |
WO (1) | WO1990011335A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993013093A1 (de) * | 1991-12-28 | 1993-07-08 | Hoechst Aktiengesellschaft | Chirale oxiranylmethyl-ether und ihre verwendung als dotierstoffe in flüssigkristallmischungen |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7195719B1 (en) | 2001-01-03 | 2007-03-27 | Displaytech, Inc. | High polarization ferroelectric liquid crystal compositions |
US6838128B1 (en) | 2002-02-05 | 2005-01-04 | Displaytech, Inc. | High polarization dopants for ferroelectric liquid crystal compositions |
CN113867063B (zh) * | 2021-10-28 | 2022-12-16 | 华南理工大学 | 一种铁电螺旋液晶材料及其实现二次谐波增强的方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0263437A2 (de) * | 1986-10-06 | 1988-04-13 | Hoechst Aktiengesellschaft | Chirale Aryl-2,3-epoxyalkyl-ether und deren entsprechende Thioverbindungen und ihre Verwendung als Dotierstoff in Flüssigkristall-Phasen |
DE3831226A1 (de) * | 1987-09-19 | 1989-03-30 | Hoechst Ag | Fluessigkristalline, insbesondere ferroelektrische fluessigkristalline mischungen |
EP0351746A1 (de) * | 1988-07-22 | 1990-01-24 | Hoechst Aktiengesellschaft | Optisch aktive, in 4-Stellung einen mesogenen Rest tragende 1,3-Dioxolan-Derivate, ein Verfahren zu ihrer Herstellung und ihre Verwendung als Dotierstoffe in Flüssigkristallmischungen |
EP0355561A1 (de) * | 1988-08-13 | 1990-02-28 | Hoechst Aktiengesellschaft | Verwendung von optisch aktiven Tetrahydrofuran-2-carbonsäureestern als Dotierstoffe in Flüssigkristallmischungen, diese enthaltende Flüssigkristallmischungen und neue optisch aktive Tetrahydrofuran-2-carbonsäureester |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63179835A (ja) * | 1986-12-20 | 1988-07-23 | メルク・パテント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | シクロペンタン誘導体 |
-
1989
- 1989-03-22 DE DE3909355A patent/DE3909355A1/de not_active Withdrawn
-
1990
- 1990-03-15 TW TW079102049A patent/TW208067B/zh active
- 1990-03-21 DE DE59009244T patent/DE59009244D1/de not_active Expired - Fee Related
- 1990-03-21 WO PCT/EP1990/000457 patent/WO1990011335A1/de active IP Right Grant
- 1990-03-21 CA CA002049960A patent/CA2049960A1/en not_active Abandoned
- 1990-03-21 EP EP90904624A patent/EP0464058B1/de not_active Expired - Lifetime
- 1990-03-21 JP JP2504661A patent/JPH04504272A/ja active Pending
- 1990-03-21 US US07/761,813 patent/US5378394A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0263437A2 (de) * | 1986-10-06 | 1988-04-13 | Hoechst Aktiengesellschaft | Chirale Aryl-2,3-epoxyalkyl-ether und deren entsprechende Thioverbindungen und ihre Verwendung als Dotierstoff in Flüssigkristall-Phasen |
DE3831226A1 (de) * | 1987-09-19 | 1989-03-30 | Hoechst Ag | Fluessigkristalline, insbesondere ferroelektrische fluessigkristalline mischungen |
EP0351746A1 (de) * | 1988-07-22 | 1990-01-24 | Hoechst Aktiengesellschaft | Optisch aktive, in 4-Stellung einen mesogenen Rest tragende 1,3-Dioxolan-Derivate, ein Verfahren zu ihrer Herstellung und ihre Verwendung als Dotierstoffe in Flüssigkristallmischungen |
EP0355561A1 (de) * | 1988-08-13 | 1990-02-28 | Hoechst Aktiengesellschaft | Verwendung von optisch aktiven Tetrahydrofuran-2-carbonsäureestern als Dotierstoffe in Flüssigkristallmischungen, diese enthaltende Flüssigkristallmischungen und neue optisch aktive Tetrahydrofuran-2-carbonsäureester |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993013093A1 (de) * | 1991-12-28 | 1993-07-08 | Hoechst Aktiengesellschaft | Chirale oxiranylmethyl-ether und ihre verwendung als dotierstoffe in flüssigkristallmischungen |
US5707545A (en) * | 1991-12-28 | 1998-01-13 | Hoechst Aktiengesellschaft | Chiral oxiranylmethyl ethers, and their use as dopants in liquid-crystal mixtures |
Also Published As
Publication number | Publication date |
---|---|
DE59009244D1 (de) | 1995-07-20 |
TW208067B (de) | 1993-06-21 |
EP0464058B1 (de) | 1995-06-14 |
DE3909355A1 (de) | 1990-09-27 |
CA2049960A1 (en) | 1990-09-23 |
JPH04504272A (ja) | 1992-07-30 |
US5378394A (en) | 1995-01-03 |
EP0464058A1 (de) | 1992-01-08 |
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