KR20110039477A - Liquid-crystal display - Google Patents

Liquid-crystal display Download PDF

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KR20110039477A
KR20110039477A KR1020117004666A KR20117004666A KR20110039477A KR 20110039477 A KR20110039477 A KR 20110039477A KR 1020117004666 A KR1020117004666 A KR 1020117004666A KR 20117004666 A KR20117004666 A KR 20117004666A KR 20110039477 A KR20110039477 A KR 20110039477A
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신지 나카지마
노리히코 다나카
다카노리 다케다
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메르크 파텐트 게엠베하
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    • C09K2019/548Macromolecular compounds stabilizing the alignment; Polymer stabilized alignment

Abstract

The present invention relates to LC media for use in liquid crystal (LC) displays of the PS (polymer stabilization) or PSA (polymer sustained alignment) type.

Description

Liquid Crystal Display {LIQUID-CRYSTAL DISPLAY}

The present invention relates to LC media for use in liquid crystal (LC) displays of the PS (polymer stabilization) or PSA (polymer sustained alignment) type.

Currently used liquid crystal displays (LC displays) are mostly TN (twisted nematic) type displays. However, such a display has a disadvantage that the viewing angle dependency of contrast is strong.

In addition, so-called VA (vertical alignment) displays with a wider viewing angle are also known. The LC cell of the VA display contains a layer of LC medium which generally has negative dielectric (DC) anisotropy between two transparent electrodes. In the switch-off state, the molecules of the LC layer are aligned perpendicular to the electrode surface (homeotropic) or have an inclined homeotropic alignment. When an electrical voltage is applied to the electrode, the LC molecules are rearranged parallel to the electrode surface.

In addition, OCB (optical compensation bend) displays are known which have LC layers based on birefringence effects and have a so-called "bend" alignment and generally positive (DC) anisotropy. When an electrical voltage is applied, the LC molecules are rearranged perpendicular to the electrode surface. In addition, OCB displays typically contain one or more birefringent optical retardation films to prevent unwanted light transmission of the bend cell in the dark state. OCB displays have a wider viewing angle and shorter response time than TN displays.

IPS (in-plane switching) containing an LC layer between two substrates (but at this time two electrodes are located only on one of the substrates) and generally having a hair comb-like interdigital structure Display is also known. When a voltage is applied to the electrodes, an electric field with a principal component parallel to the LC layer is produced. This rearranges the LC molecules in the layer plane. Furthermore, similarly it contains two electrodes on the same substrate, but unlike IPS displays, only one of them is a structured (hair-shaped) electrode and the other electrode is a non-structured, so-called fringe field switching. Display is also proposed (see, in particular, SHJung et al., Jpn. J. Appl. Phys., Volume 43, No. 3, 2004, 1028). This produces a strong so-called "fringe field", i.e. a strong electric field close to the edge of the electrode and a strong electric field in both the vertical and horizontal components throughout the cell. Both IPS displays and FFS displays have low viewing angle dependence of contrast.

For more recent types of VA displays, the uniform alignment of LC molecules is limited to a plurality of relatively small domains within the LC cell. There may be a disclination between these domains, also known as tilt domains. VA displays with tilt domains have greater viewing angle dependence of contrast and grayscale compared to conventional VA displays. In addition, this type of display can be manufactured more simply because no further processing of the electrode surface is required for uniform alignment of molecules, for example by rubbing, in the switched-on state. have. Instead, the preferred direction of tilt or pretilt angle is controlled by the specific design of the electrode. In the case of so-called MVA (multi-domain vertical alignment) displays, this is generally achieved by electrodes having protrusions which cause local pretilt. As a result, the LC molecules are aligned parallel to the electrode surface in different directions in different defined regions of the cell upon application of voltage. This achieves “controlled” switching and suppresses the formation of interfering disclination lines. While this arrangement improves the viewing angle of the display, its light transmission is reduced. A further improvement of the MVA improves light transmission by using protrusions on only one electrode face and the opposite electrode having a slit. Electrodes with slits generate a non-uniform electric field in the LC cell upon voltage application, which means that controlled switching is still achieved. To further improve light transmission, the distance between the slit and the protrusion can be increased, but this in turn prolongs the response time. In the case of the so-called PVA (patterned VA), both electrodes are structured by slits on the opposite side, increasing contrast and improving light transmission, but this is technically difficult and the display is mechanically affected (tapping, etc.). The protrusions become completely inadequate in that they are more sensitive to. However, for many applications, for example monitors, especially TV screens, the response time of the display and the contrast and brightness (transmittance) must be improved.

So-called PS (polymer stabilized) or PSA (polymer sustained alignment) displays have been further developed. In these cases, small amounts (e.g., 0.3% by weight, typically less than 1% by weight) of polymerizable compounds are added to the LC medium and introduced into the LC cell, usually by applying an electrical voltage between the electrodes. UV photopolymerization polymerizes or crosslinks in situ. In addition, addition of polymerizable mesogenic or liquid crystalline compounds, also known as "reactive mesogens (RM)", to LC mixtures has proven particularly suitable.

On the other hand, the PS or PSA principle is also used in various conventional LC displays. For example, PSA-VA, PSA-OCB, PS-IPS and PS-TN displays are known. As can be demonstrated in the test cell, the PSA method produces pretilt in the cell. Therefore, in the case of the PSA-OCB display, it is possible to stabilize the bend structure so that an offset voltage is unnecessary or can be reduced. For PSA-VA displays, this pretilt has a positive effect on response time. For PSA-VA displays, standard MVA or PVA pixel and electrode designs can be used. However, in addition, for example, by operating with only one structured electrode face and no protrusion at all, it is possible to significantly simplify production and at the same time obtain very good light transmission with very good contrast.

Unless otherwise stated, the term "PSA" is used to refer to PS displays and PSA displays.

PSA-VA displays are described, for example, in JP 10-036847 A, EP 1 170 626 A2, US 6,861,107, US 7,169,449, US 2004/0191428 A1, US 2006/0066793 A1 and US 2006/0103804 A1. PSA-OCB displays are described, for example, in T. -J-. Chen et al., Jpn. J. Appl. Phys. 45, 2006, 2702-2704 and S. H. Kim, L. -C-. Chien, Jpn. J. Appl. Phys. 43, 2004, 7643-7647. PS-IPS displays are described, for example, in US 6,177,972 and Appl. Phys. Lett. 1999, 75 (21), 3264. PS-TN displays are described, for example, in Optics 2004, 12 (7), 1221.

In particular, for monitors, in particular for TV applications, there is still a need for optimization of contrast and luminance (i.e. transmittance) as well as optimization of the response time of LC displays. The PSA method still appears to provide a decisive advantage here. Especially in the case of PSA-VA, it is possible to shorten the response time correlated with pretilt which can be measured in the test cell without significant side effects on other parameters.

However, LC mixtures and RMs known from the prior art have been found to still have some disadvantages when used in PSA displays. Thus, not all desired soluble RMs are suitable for PSA displays, and sometimes it seems difficult to identify more suitable selection criteria than direct PSA experiments measuring pretilt. If polymerization with UV light is desired without the addition of photoinitiators, the choice is even smaller, which may be beneficial in certain applications.

In addition, the selected "material system" of the LC mixture (hereinafter also referred to as "LC host mixture") + polymerizable components should have the highest possible electrical properties, in particular "voltage retention" (HR or VHR). In the context of PSA-VA, high HR after irradiation with (UV) light is important, especially since this is an absolutely necessary part of the process, but of course it appears as a "normal" stress in the final display.

However, a problem arises that not all LC combinations + combinations of polymerizable components are "functioning", for example, due to inadequate tilt occurring or not occurring at all, or because HR is inadequate for TFT display applications, for example. do.

Thus, there is still a great need for PSA displays, especially VA type displays, and LC media and polymerizable compounds for use in such displays, which do not have this disadvantage or have only a small extent and have improved properties. In particular, PSAs with large working temperature ranges, short response times at low temperatures, and high resistivity simultaneously with high threshold of gray shades, high contrast and wide viewing angles and high voltage holding ratio (HR) values after UV exposure There is a great demand for displays or materials. In PSA displays for mobile applications, it is particularly necessary to have an LC medium that can exhibit low threshold voltages and high birefringence.

The present invention is capable of setting a pretilt angle, and at the same time preferably providing a PSA display having very high resistivity values, low threshold voltages and short response times, having no or only a small extent of the disadvantages described above. The purpose is.

Surprisingly, it has been found that this object can be achieved by using a PSA display according to the invention which contains the LC medium described herein. Especially surprisingly, the non-polymerizable component (host component) consists essentially of mesogenic or liquid crystalline compounds having at least one phenylene group which is disubstituted in the 2- and 3-positions by F and / or Cl, preferably F It has been found that using LC mixtures which are nematic mixtures can achieve significantly lower threshold voltages and higher birefringence compared to the LC media and LC host components disclosed in the prior art. In addition, the LC medium of the present invention has a high specific resistance value and excellent low temperature stability (LTS) against unwanted simultaneous crystallization and, when used in PSA displays, exhibits an appropriate tilt angle without the use of a photoinitiator.

Accordingly, the present invention relates to a liquid crystal (LC) medium comprising a polymerizable component and a nematic component comprising at least one polymerizable compound, wherein the nematic component is selected from 2- and 3- by F and / or Cl. Characterized in that it contains 90 to 100% by weight, preferably more than 90 to 100% by weight of at least one compound comprising at least one 1,4-phenylene group substituted at the position, preferably selected from mesogenic or liquid crystal compounds It is done.

The invention also relates to an LC medium described above and below, wherein said nematic component is from 90 to 100% by weight, preferably greater than 90 to 100%, selected from the group consisting of the formulas CY, PY and TY Contains% of compounds:

Figure pct00001

Wherein each radical has the following meaning:

a represents 1 or 2,

b represents 0 or 1,

Figure pct00002
Is
Figure pct00003
Indicates

Figure pct00004
Independently of each other
Figure pct00005
, But
Figure pct00006
One or more of
Figure pct00007
Lt; / RTI >

R 1 and R 2 each independently represent an alkyl or alkenyl having 1 to 12 carbon atoms, wherein one or two non-adjacent CH 2 groups are also -O- in such a way that no O atoms are directly connected to each other. , -CH = CH-, -CO-, -OCO- or -COO-,

R 5 and R 6 each independently of one another have one of the meanings described above for R 1 ,

Z x is -CH = CH-, -CH 2 O-, -OCH 2 -, -CF 2 O-, -OCF 2 -, -O-, -CH 2 -, -CH 2 CH 2 - or a single bond, Preferably represents a single bond,

L 1 -4 represents each independently F or Cl from each other,

L 5 and L 6 each independently represent F, Cl, OCF 3 , CF 3 , CH 3 , CH 2 F or CHF 2 .

The invention also relates to the use of the LC media described above and below in LC displays, preferably displays of the PS (polymer stabilized) or PSA (polymer sustained alignment) type.

The invention also relates to the use of the LC medium described above and below, wherein the polymerizable component is polymerized in an LC display, preferably in a display of the PS (polymer stabilized) or PSA (polymer sustained alignment) type. do.

The invention also relates to an LC display, preferably a PS or PSA type display, very preferably a PSA-VA or PSA-IPS display, comprising the LC medium described above and below.

The invention also relates to an LC display, preferably a PS or PSA type display, very preferably a PSA-VA or PSA-IPS display, comprising the LC medium described above and below, wherein the polymerizable component is polymerized. It is about.

Preferably, the PSA display comprises: two substrates, wherein the at least one substrate is translucent and the at least one substrate has one or two electrode layers thereon, and two electrodes; And a polymerized component and a low-molecular weight component located between the substrates, wherein the polymerized component polymerizes one or more polymerizable compounds in an LC medium between the substrates of a display cell while applying a voltage to the electrodes. And a display cell comprising an LC medium layer, wherein the low-molecular weight component is the nematic component described above and below.

The invention also provides an LC medium comprising at least one polymerizable component and the nematic components described above and below into a display cell comprising two substrates and two electrodes, and applying a voltage to the electrodes. A method of making a display as described above and below by polymerizing the at least one polymerizable compound, wherein at least one substrate is translucent and at least one substrate has one or two electrodes provided thereon.

The PS- and PSA-displays of the invention preferably contain two electrodes as transparent layers, wherein these two electrodes are provided on one or both of the two substrates forming the display cell. Thus, for example, in the VA type display of the present invention, either electrode is provided on each of two substrates, or in the IPS or FFS type display of the present invention, both electrodes are provided on one substrate and the other The substrate is not provided with electrodes.

The LC medium for use in the LC display according to the invention is one or more, preferably two or more low-molecular weights (i.e. monomeric or non-specific) selected from one or more polymerizable compounds and generally mesogenic or liquid crystal compounds. LC mixtures (“host mixtures”) comprising a (polymerized) compound. The LC mixture is stable or non-reactive to the polymerization reaction under the conditions used for the polymerization of the polymerizable compound.

Preferably, the LC medium according to the invention consists essentially of one or more polymerizable compounds and nematic components (or host LC mixtures) described above and below. However, the LC medium may comprise one or more additional components or additives selected from, for example, chiral dopants, polymerization initiators, inhibitors, stabilizers, surfactants, nanoparticles and the like.

The nematic component or LC host mixture is preferably a nematic LC mixture. The terms "nematic component" and "nematic LC mixture" herein refer to LC mixtures which have a nematic LC mixture but may additionally have other LC phases (eg smectic phase), very preferably only nematic It means an LC mixture with an LC phase and no other LC phases.

LC host mixtures and LC media according to the present invention are advantageous because they exhibit significantly lower threshold voltages and higher birefringence than PSA displays comprising LC host components disclosed in the prior art. They are therefore particularly suitable for use in PSA displays for mobile applications.

The invention also relates to the novel nematic components and LC host mixtures (ie, which do not contain polymerizable compounds but consist essentially of non-polymerizable or low molecular weight compounds) described above and below. These LC mixtures can be used in traditional VA type displays such as VA- and MVA-displays. The invention also relates to LC displays, preferably VA and MVA displays containing such LC mixtures.

Especially preferred for the nematic component are compounds comprising at least one 1,4-phenylene group which is disubstituted in the 2- and 3-positions by F. Further preferred are compounds of formula CY, PY and TY, wherein L 1 , L 2 , L 3 and L 4 are F.

In the formulas CY, PY and TY, preferably both radicals L 1 and L 2 represent F, or one of the radicals L 1 and L 2 represents F and the other represents Cl, preferably the radical L 3 And L 4 both represent F, or one of the radicals L 3 and L 4 represents F and the other represents Cl.

Especially preferred are LC mixtures containing at least one compound of the formula CY. Further preferred are LC mixtures comprising at least one compound of formula CY and at least one compound of formula PY. Further preferred are LC mixtures containing at least one compound of each of the formulas CY, PY and TY.

Further preferred LC media and LC host mixtures are described below:

a) LC host mixture comprising at least one compound selected from the following sub-formulas CY1 to CY28:

Figure pct00008

Figure pct00009

Figure pct00010

Figure pct00011

Figure pct00012

Where

a represents 1 or 2, alkyl and alkyl * each independently represent a straight chain alkyl radical having 1 to 6 carbon atoms, alkenyl represents a straight chain alkenyl radical having 2 to 6 carbon atoms, (O ) Represents an oxygen atom or a single bond. Alkenyl is preferably CH 2 = CH-, CH 2 = CHCH 2 CH 2- , CH 3 -CH = CH-, CH 3 -CH 2 -CH = CH-, CH 3- (CH 2 ) 2 -CH = CH—, CH 3 — (CH 2 ) 3 —CH═CH— or CH 3 —CH═CH— (CH 2 ) 2 —.

b) LC host mixture comprising at least one compound selected from the following sub-formulas PY1 to PY20:

Figure pct00013

Figure pct00014

Figure pct00015

Figure pct00016

Where

Alkyl and alkyl * each independently represent a straight chain alkyl radical having 1 to 6 carbon atoms, alkenyl represents a straight chain alkenyl radical having 2 to 6 carbon atoms, and (O) represents an oxygen atom or a single bond Indicates. Alkenyl is preferably CH 2 = CH-, CH 2 = CHCH 2 CH 2- , CH 3 -CH = CH-, CH 3 -CH 2 -CH = CH-, CH 3- (CH 2 ) 2 -CH = CH—, CH 3 — (CH 2 ) 3 —CH═CH— or CH 3 —CH═CH— (CH 2 ) 2 —.

c) LC host mixture comprising at least one compound selected from the following sub-formulas TY1 to TY18:

Figure pct00017

Figure pct00018

Figure pct00019

Where

R represents straight chain alkyl or alkoxy having 1 to 7 carbon atoms, R * represents straight chain alkenyl radical having 2 to 7 carbon atoms, (O) represents an oxygen atom or a single bond, and m is 1 The integer of -6 is shown. R * is preferably CH 2 = CH-, CH 2 = CHCH 2 CH 2- , CH 3 -CH = CH-, CH 3 -CH 2 -CH = CH-, CH 3- (CH 2 ) 2 -CH = CH-, CH 3- (CH 2 ) 3 -CH = CH- or CH 3 -CH = CH- (CH 2 ) 2- .

R preferably denotes methyl, ethyl, propyl, butyl, pentyl, hexyl, methoxy, ethoxy, propoxy, butoxy or pentoxy.

d) an LC host mixture further comprising at least one compound of the formula LY:

Figure pct00020

Where

Each radical has the following meaning:

Figure pct00021
Is
Figure pct00022
Indicates

f represents 0 or 1,

R 1 and R 2 each independently represent an alkyl having from 1 to 12 carbon atoms, wherein also one or two non-adjacent CH 2 groups are -O-, -CH in such a way that the O atoms are not directly connected to each other. May be replaced by = CH-, -CO-, -OCO- or -COO-,

Z x and Z y are each independently from each other -CH 2 CH 2 -, -CH = CH-, -CF 2 O-, -OCF 2 -, -CH 2 O-, -OCH 2 -, -COO-, - OCO—, —C 2 F 4 —, —CF═CF—, —CH═CHCH 2 O— or a single bond, preferably a single bond,

L 5 And L 6 each independently represent F, Cl, OCF 3 , CF 3 , CH 3 , CH 2 F or CHF 2 .

Preferably, the radicals L 5 and L 6 All represent F, or one of the radicals L 5 and L 6 represents F and the other represents Cl.

Compounds of formula LY are preferably selected from the following sub-formulas LY1 to LY18:

Figure pct00023

Figure pct00024

Figure pct00025

Where

R 1 has the meaning described above, (O) represents an oxygen atom or a single bond, alkyl represents a straight chain alkyl radical having 1 to 6 carbon atoms, and v represents an integer from 1 to 6. R 1 preferably denotes straight chain alkyl having 1 to 6 carbon atoms or straight chain alkenyl having 2 to 6 carbon atoms, in particular CH 3 , C 2 H 5 , nC 3 H 7 , nC 4 H 9 , nC 5 H 11 , CH 2 = CH-, CH 2 = CHCH 2 CH 2- , CH 3 -CH = CH-, CH 3 -CH 2 -CH = CH-, CH 3- (CH 2 ) 2 -CH = CH-, CH 3- (CH 2 ) 3 -CH = CH- or CH 3 -CH = CH- (CH 2 ) 2- . The LC medium according to the invention preferably comprises at least one compound of the above-mentioned formula in an amount greater than 0 and up to 10% by weight.

e) LC host mixture further comprising at least one compound selected from formulas Y1 to Y16:

Figure pct00026

Figure pct00027

Figure pct00028

Where

R 5 is for R 1 has one of the meanings set forth, alkyl is C 1 -6 - represents an alkyl, d is 0 or 1, z and m represents an integer of 1 to 6, each independently from each other. In these compounds, R 5 is particularly preferably a C 1 -6-alkyl or -alkoxy or C 2 -6-alkenyl, and, d is preferably 1. The LC medium according to the invention preferably comprises at least one compound of the above-mentioned formula in an amount greater than 0 and up to 10% by weight.

f) an LC host mixture further comprising at least one compound of the formula FI below in an amount of preferably more than 3%, in particular more than 5%, very particularly preferably from 5 to 30% by weight:

Figure pct00029

Where

Figure pct00030
Is

Figure pct00031
Lt; / RTI >

R 9 represents H, CH 3 , C 2 H 5 or nC 3 H 7 , (F) represents an optional fluorine substituent, q represents 1, 2 or 3 and R 7 is the meaning described for R 1 Has one.

Particularly preferred compounds of formula FI are selected from compounds of the following sub-formulas FI1 to FI8:

Figure pct00032

Figure pct00033

Where

R 7 preferably denotes straight chain alkyl having 1 to 6 carbon atoms and R 9 represents CH 3 , C 2 H 5 or nC 3 H 7 . Particular preference is given to compounds of the formulas FI1, FI2 and FI3.

g) LC host mixture further comprising at least one compound of the formulas VK1 to VK4:

Figure pct00034

Where

R 8 has the meaning described for R 1, and alkyl represents a straight chain alkyl radical having 1 to 6 carbon atoms.

h) an LC host mixture further comprising at least one compound containing tetrahydronaphthyl or naphthyl units, such as, for example, a compound selected from the group consisting of compounds of the formulas N1 to N10:

Figure pct00035

Figure pct00036

Where

R 10 and R 11 each independently of one another have one of the meanings described for R 1 , and are preferably straight chain alkyl or straight chain alkoxy having 1 to 6 carbon atoms, or straight chain alkenyl having 2 to 6 carbon atoms Z 1 and Z 2 are each independently of the other -C 2 H 4- , -CH = CH-,-(CH 2 ) 4 -,-(CH 2 ) 3 O-, -O (CH 2 ) 3 -, -CH = CHCH 2 CH 2- , -CH 2 CH 2 CH = CH-, -CH 2 O-, OCH 2- , -COO-, -OCO-, -C 2 F 4- , -CF = CF -, -CF = CH-, -CH = CF-, -CH 2 -or a single bond.

i) LC host mixture further comprising at least one difluorodibenzochroman and / or chromman of the formula BC or CR, preferably in an amount of from 3 to 20% by weight, in particular from 3 to 15% by weight:

Figure pct00037

Where

R 11 and R 12 each have the above-mentioned meaning independently of each other, and c represents 0 or 1.

Particularly preferred compounds of the formulas BC and CR are selected from the group consisting of the compounds of the following sub-formulas BC1 to BC7 and CR1 to CR5:

Figure pct00038

Figure pct00039

Where

Alkyl and alkyl * each independently represent a straight chain alkyl radical having 1 to 6 carbon atoms, and alkenyl and alkenyl * each independently represent a straight chain alkenyl radical having 2 to 6 carbon atoms. Alkenyl and alkenyl * are preferably CH 2 = CH-, CH 2 = CHCH 2 CH 2- , CH 3 -CH = CH-, CH 3 -CH 2 -CH = CH-, CH 3- (CH 2 ) 2 -CH = CH-, CH 3- (CH 2 ) 3 -CH = CH- or CH 3 -CH = CH- (CH 2 ) 2- . Very particular preference is given to mixtures comprising one, two or three compounds of the formula BC2.

k) LC host mixture further comprising at least one fluorinated phenanthrene or dibenzofuran of formula PH or BF:

Figure pct00040

Where

R 11 and R 12 each independently have the meanings mentioned above, b represents 0 or 1, L represents F and r represents 1, 2 or 3.

Particularly preferred compounds of the formulas PH and BF are selected from the group consisting of the compounds of the following sub-formulas PH1, PH2, BF1 and BF2:

Figure pct00041

Figure pct00042

Where

R and R 'each independently represent a straight chain alkyl or alkoxy radical having 1 to 7 carbon atoms.

l) the proportion of compounds containing at least one 1,4-phenylene group substituted at the 2- and 3-positions by F and / or Cl with respect to the host compound (or nematic component) in total is greater than 90% by weight, preferably Preferably greater than 95% by weight, very preferably greater than 98% by weight, most preferably 100% by weight.

m) LC host mixture or nematic component comprising at least one, preferably 3 to 20, compounds of the formulas CY, PY and / or TY. The proportion of these compounds in the host mixture is preferably greater than 90% by weight in total, very preferably greater than 95% by weight, most preferably 100% by weight. The amount of each of these compounds is preferably in each case 2 to 30% by weight.

n) among the groups consisting of the compounds of the formulas CY, PY and TY, the compounds of the formulas CY1, CY2, CY9, CY10, PY1, PY2, PY9, PY10, TY1 and TY2, very preferably of the formulas CY1, CY2, CY9, CY10 LC host mixture or nematic component selected from the group consisting of compounds of PY9, PY10 and TY1.

o) LC medium containing no compounds containing terminal vinyl or vinyloxy groups (-CH = CH 2 , -O-CH = CH 2 ) except for the polymerizable compounds described above and below.

p) LC medium comprising 1 to 5, preferably 1, 2 or 3 polymerizable compounds.

q) LC medium in which the proportion of polymerizable compounds in the medium is in total of 0.05 to 5% by weight, preferably 0.1 to 1% by weight.

r) LC medium which further comprises one or more preferably low-molecular weight and / or non-polymerizable chiral dopants, very preferably those selected from Table B, preferably in the concentration ranges given in Table B.

In addition, the LC host mixture may contain more than 0 and less than 10% by weight of a compound without a phenylene ring disubstituted at the 2- and 3-positions by F and / or Cl. Such compounds, when present, are preferably selected from the following embodiments:

1) LC host mixture comprising at least one compound of the formula ZK:

Figure pct00043

Where

Each radical has the following meaning:

Figure pct00044
Is

Figure pct00045
Lt; / RTI >

Figure pct00046
Is
Figure pct00047
Lt; / RTI >

R 3 and R 4 are each independently alkyl having 1 to 12 carbon atoms, wherein also one or two non-adjacent CH 2 groups are each represented by -O-, -CH = in such a way that no O atoms are directly connected to each other. May be replaced by CH-, -CO-, -OCO- or -COO-,

Y Z is -CH 2 CH 2 -, -CH = CH-, -CF 2 O-, -OCF 2 -, -CH 2 O-, -OCH 2 -, -COO-, -OCO-, -C 2 F 4- , -CF = CF-, -CH = CHCH 2 O- or a single bond, preferably a single bond.

The compound of formula ZK is preferably selected from the group consisting of the compounds of the following sub-formulas ZK1 to ZK10:

Figure pct00048

Figure pct00049

Where

Alkyl and alkyl * each independently represent a straight chain alkyl radical having 1 to 6 carbon atoms and alkenyl represent a straight chain alkenyl radical having 2 to 6 carbon atoms. Alkenyl is preferably CH 2 = CH-, CH 2 = CHCH 2 CH 2- , CH 3 -CH = CH-, CH 3 -CH 2 -CH = CH-, CH 3- (CH 2 ) 2 -CH = CH—, CH 3 — (CH 2 ) 3 —CH═CH— or CH 3 —CH═CH— (CH 2 ) 2 —.

2) LC host mixture further comprising at least one compound of formula DK:

Figure pct00050

Where

 Each radical has the same meaning in each case to be the same or different:

R 5 and R 6 has one of the meanings described for R 1 independently from each other, respectively,

Figure pct00051
Is
Figure pct00052
Lt; / RTI >

Figure pct00053
Is
Figure pct00054
Lt; / RTI >

e represents 1 or 2.

The compound of formula DK is preferably selected from the group consisting of compounds of the following sub-formulas DK1 to DK10:

Figure pct00055

Figure pct00056

Where

Alkyl and alkyl * each independently represent a straight chain alkyl radical having 1 to 6 carbon atoms, and alkenyl and alkenyl * each independently represent a straight chain alkenyl radical having 2 to 6 carbon atoms. Alkenyl and alkenyl * are preferably CH 2 = CH-, CH 2 = CHCH 2 CH 2- , CH 3 -CH = CH-, CH 3 -CH 2 -CH = CH-, CH 3- (CH 2 ) 2 -CH = CH-, CH 3- (CH 2 ) 3 -CH = CH- or CH 3 -CH = CH- (CH 2 ) 2- .

3) LC host mixture further comprising at least one compound selected from compounds of the formulas G1 to G4:

Figure pct00057

Figure pct00058

Where

Alkyl is C 1 -6 - represents alkyl, L * represents H or F, X is F, Cl, OCF 3, OCHF 2, or represents the OCH = CF 2. Particular preference is given to compounds of the formula G1 in which X represents F.

4) LC host mixture further comprising at least one biphenyl compound of formula B1 to B3:

Figure pct00059

Where

Alkyl and alkyl * each independently represent a straight chain alkyl radical having 1 to 6 carbon atoms, and alkenyl and alkenyl * each independently represent a straight chain alkenyl radical having 2 to 6 carbon atoms. Alkenyl and alkenyl * are preferably CH 2 = CH-, CH 2 = CHCH 2 CH 2- , CH 3 -CH = CH-, CH 3 -CH 2 -CH = CH-, CH 3- (CH 2 ) 2 -CH = CH-, CH 3- (CH 2 ) 3 -CH = CH- or CH 3 -CH = CH- (CH 2 ) 2- .

The proportion of biphenyls of the formulas B1 to B3 in the LC mixture is preferably at least 3% by weight, in particular at least 5% by weight.

Particular preference is given to compounds of the formula B2.

Compounds of formulas B1 to B3 are preferably selected from the group consisting of compounds of the following sub-formulas B1a, B2a, B2b and B2c:

Figure pct00060

Where

Alkyl * denotes an alkyl radical having 1 to 6 carbon atoms. The medium according to the invention particularly preferably comprises at least one compound of the formulas Bla and / or B2c.

5) LC host mixture further comprising at least one terphenyl compound of formula T:

Figure pct00061

Where

R 5 and R 6 each independently of one another have one of the meanings described above for R 1 ,

Figure pct00062
Each independently of each other

Figure pct00063
Wherein L 5 represents F or Cl, preferably F, and L 6 represents F, Cl, OCF 3 , CF 3 , CH 3 , CH 2 F or CHF 2 , preferably F.

The compound of formula T is preferably selected from the group consisting of the compounds of the following sub-formulas T1 to T6:

Figure pct00064

Where

R represents a straight chain alkyl or alkoxy radical having 1 to 7 carbon atoms, R * represents a straight chain alkenyl radical having 2 to 7 carbon atoms, (O) represents an oxygen atom or a single bond, and m is The integer of 1-6 is shown. R * is preferably CH 2 = CH-, CH 2 = CHCH 2 CH 2- , CH 3 -CH = CH-, CH 3 -CH 2 -CH = CH-, CH 3- (CH 2 ) 2 -CH = CH-, CH 3- (CH 2 ) 3 -CH = CH- or CH 3 -CH = CH- (CH 2 ) 2- .

R preferably denotes methyl, ethyl, propyl, butyl, pentyl, hexyl, methoxy, ethoxy, propoxy, butoxy or pentoxy.

6) LC host mixture further comprising at least one compound of the formulas O1-O11:

Figure pct00065

Figure pct00066

Where

R 1 and R 2 have the meanings mentioned above, and preferably each independently represent straight chain alkyl or alkenyl.

Preferred mixtures include one or more compounds selected from compounds of the formulas O1, O3 and O4.

The combination of the compounds of the preferred embodiments mentioned above with the polymerized compounds described above and below achieves a low threshold voltage and very good low temperature stability while maintaining high clearing point and high HR value in the LC medium according to the invention. Allow the pretilt angle to be set on the PSA display. In particular, the LC medium exhibits a significantly shorter response time in PSA displays, in particular gray-shaded response time compared to prior art media.

The LC host mixture preferably has a nematic phase range at 20 ° C. of at least 80 K, particularly preferably at least 100 K and a rotational viscosity of 450 mPa · s or less, preferably 350 mPa · s or less.

The LC host mixture preferably has a negative dielectric anisotropy Δε at -20 ° C and 1 kHz in the range of -0.5 to -7.5, in particular -2.5 to -6.0.

The LC host mixture preferably has a birefringence Δn of more than 0.06, very preferably more than 0.09, most preferably more than 0.12, and a birefringence Δn of preferably less than 0.20, very preferably less than 0.18, most preferably Is less than 0.16.

The LC medium may also further comprise additional additives known to those skilled in the art and described in the literature, for example polymerization initiators, inhibitors, stabilizers, surface-active substances or chiral dopants. These additives are polymerizable or non-polymerizable. Thus, the polymerizable additive belongs to the polymerizable component and the non-polymerizable additive will belong to the nematic component of the LC medium.

The LC medium may contain, for example, one or more chiral dopants, preferably selected from the group consisting of compounds from Table B below.

For example, 0 to 15% by weight of a polychromatic dye may be added and furthermore nanoparticles, conductive salts, preferably ethyldimethyldodecylammonium 4-hexoxybenzoate, tetrabutylammonium tetraphenylborate, or crown Ether salts (see, eg, Haller et al., Mol. Cryst. Liq. Cryst. 24 , 249-258 (1973)) may be added to improve conductivity, or may be genetically anisotropic on nematic, Materials to improve viscosity and / or alignment can be added. Materials of this type are for example DE-A-22 09 127, DE-A-22 40 864, DE-A-23 21 632, DE-A-23 38 281, DE-A-24 50 088, DE- A-26 37 430 and DE-A-28 53 728.

Individual components of the preferred embodiments of the LC medium according to the invention are known or those skilled in the art can easily derive their preparation methods from the prior art based on standard methods described in the literature. Compounds corresponding to formula CY are described, for example, in EP-A-0 364 538. Compounds corresponding to formula ZK are described, for example, in DE-A-26 36 684 and DE-A-33 21 373.

More preferred are LC media comprising one, two or three polymerizable compounds described above and below.

More preferred are LC media comprising achiral polymerizable compounds, and achiral compounds, preferably consisting only of achiral compounds.

PSAs wherein the polymerizable component comprises at least one polymerizable compound containing a polymerizable group (mono-reactive) and at least one polymerizable compound containing two or more, preferably two polymerizable groups (2- or polyreactive) More preferred are displays and LC media.

More preferred are PSA displays and LC media in which the polymerizable component consists only of a polymerizable compound containing two polymerizable groups (direactive).

The polymerizable compounds can be added separately to the LC medium, but mixtures comprising two or more polymerizable compounds according to the invention can also be used. A copolymer is formed at the time of polymerization of such a mixture. Furthermore, the present invention relates to the polymerizable mixtures mentioned above and below. The polymerizable compound is a mesogenic or non-mesogenic, preferably mesogenic or liquid crystal.

The proportion of polymerizable components in the LC medium is preferably less than 5%, in particular less than 1%, very preferably less than 0.5%.

The proportion of the nematic component in the LC medium is preferably greater than 95%, very preferably greater than 99%.

In a preferred embodiment of the invention, the polymerizable compound is selected from formula (I):

[Formula I]

Figure pct00067

Wherein each radical has the following meaning:

R a and R b each independently represent P-Sp-, H, halogen, SF 5 , NO 2 , a carbon group or a hydrocarbon group,

P represents in each case the same or differently polymerizable groups,

Sp represents the same or different spacer groups or single bonds in each case,

A 1 and A 2 each independently represent an aromatic, heteroaromatic, cycloaliphatic or heterocyclic group having 4 to 25 carbon atoms, which may also contain a fused ring and optionally mono-substituted by L Or polysubstituted,

Z 1 is the same or different at each occurrence -O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-, -OCH 2- , -CH 2 O- , -SCH 2- , -CH 2 S-, -CF 2 O-, -OCF 2- , -CF 2 S-, -SCF 2 -,-(CH 2 ) n 1-, -CF 2 CH 2 -,- CH 2 CF 2 -,-(CF 2 ) n 1-, -CH = CH-, -CF = CF-, -C≡C-, -CH = CH-COO-, -OCO-CH = CH-, CR 0 R 00 or a single bond,

L represents P-Sp-, H, OH, CH 2 OH, halogen, SF 5 , NO 2 , carbon group or hydrocarbon group,

R 0 and R 00 each independently represent H or alkyl having 1 to 12 carbon atoms,

m1 represents 0, 1, 2, 3 or 4,

n1 represents 1, 2, 3 or 4,

Wherein at least one of the radicals R a , R b and L represents P-Sp-.

Particularly preferred compounds of formula I are

A 1 and A 2 are each independently of each other 1,4-phenylene, naphthalene-1,4-diyl or naphthalene-2,6-diyl, wherein at least one CH group in these groups is to be replaced by N Cyclohexane-1,4-diyl, wherein one or more non-adjacent CH 2 groups may also be replaced by O and / or S, 1,4-cyclohexenylene, bicyclo [ 1.1.1] pentane-1,3-diyl, bicyclo [2.2.2] octane-1,4-diyl, spiro [3.3] heptane-2,6-diyl, piperidine-1 , 4-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, indene-2,5-diyl or octahydro-4 , 7-methanoinyne-2,5-diyl or phenanthrene-2,7-diyl, wherein all of these groups may be unsubstituted or mono- or polysubstituted with L,

L is P-Sp-, OH, CH 2 OH, F, Cl, Br, I, -CN, -NO 2 , -NCO, -NCS, -OCN, -SCN, -C (= O) N (R x ) 2 , -C (= 0) Y 1 , -C (= 0) R x , -N (R x ) 2 , optionally substituted silyl, optionally substituted aryl having 6 to 20 carbon atoms, or Straight or branched chain alkyl having 1 to 25 carbon atoms, straight or branched chain alkenyl, alkynyl, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy having 2 to 25 carbon atoms ( Wherein one or more H atoms of these groups may also be replaced by F, Cl or P-Sp-), and

Y 1 represents halogen,

R x is P-Sp-, H, halogen, straight, branched or cyclic alkyl having from 1 to 25 carbon atoms, wherein at least one non-adjacent CH 2 group is not directly linked to each other by the O and / or S atoms May be replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, and one or more H atoms may be replaced by F, Cl Or P-Sp-), optionally substituted aryl or aryloxy group having 6 to 40 carbon atoms, or optionally substituted heteroaryl or heteroaryloxy having 2 to 40 carbon atoms Represents a group,

R a and R b are each independently of each other P-Sp-, H, L as defined above, or straight or branched chain alkyl having 1 to 25 carbon atoms, wherein one or more non-adjacent CH 2 The group is -C (R x ) = C (R x )-, -C≡C-, -N (R x )-, -O-, -S- in such a way that the O and / or S atoms are not directly connected to each other. , -CO-, -CO-O-, -O-CO-, -O-CO-O-, and one or more H atoms can also be replaced by F, Cl, Br, I, CN or P-Sp Can be replaced by-),

Wherein the radicals R a , R b And at least one of L represents P-Sp-.

Radicals R a and R b Particular preference is given to compounds of the formula I in which one or both represent P-Sp-.

Particularly preferred compounds of formula I are selected from compounds of the following sub-formulas I1 to I17:

Figure pct00068

Figure pct00069

Figure pct00070

Where

P, Sp, L and Z 1 in each case have the same or different meanings as mentioned above,

R has one of the meanings described for R x and preferably represents P-Sp- or straight or branched chain alkyl or alkoxy having 1 to 12 carbon atoms,

L is as defined above and preferably represents F or CH 3 ,

Z 1 preferably represents -COO-, -OCO- or a single bond,

Zx represents -O-, -CO- or CR y R z ,

R y and R z each independently represent H, F, CH 3 or CH 3 ,

m2 and m3 each independently represent an integer of 1 to 8,

o represents 0 or 1,

r represents 0, 1, 2, 3 or 4,

s represents 0, 1, 2 or 3,

t represents 0, 1 or 2,

x represents 0 or 1.

In a further preferred embodiment of the invention, the polymerizable compound is a chiral compound selected from formula II:

≪ RTI ID = 0.0 &

Figure pct00071

Where

A 1 , Z 1 And m1 in each occurrence has the same or different meanings as set forth in Formula I,

R * has, at each occurrence, the same or different one of the meanings described for R a in Formula (I),

Q optionally represents a monovalent or polysubstituted k-valent chiral group by L,

k represents 1, 2, 3, 4, 5 or 6,

The compound then contains one or more radicals R * or L, which represent or contain a P-Sp- group as defined above.

Particularly preferred compounds of formula II contain monovalent Q groups of formula III:

[Formula III]

Figure pct00072

Where

L and r each have the same or different meanings set forth above,

A * and B * each independently represent fused benzene, cyclohexane or cyclohexene,

t represents 0, 1 or 2, identically or differently in each case,

u represents 0, 1 or 2, identically or differently, in each case.

Particular preference is given to groups of the formula III in which x represents 1 or 2.

Another preferred compound of formula II contains a monovalent Q group or at least one R * group of formula IV:

[Formula IV]

Figure pct00073

Where

Q 1 represents an alkylene or alkyleneoxy having 1 to 9 carbon atoms, or a single bond,

Q 2 represents optionally fluorinated alkyl or alkoxy having 1 to 10 carbon atoms, wherein one or more non-adjacent CH 2 groups also represent -O- in such a way that the O and / or S atoms are not directly connected to each other. To be replaced by -S-, -CH = CH-, -CO-, -OCO-, -COO-, -O-COO-, -S-CO-, -CO-S- or -C≡C- Can,

Q 3 represents alkyl or alkoxy as defined for F, Cl, CN, or Q 2 , but is different from Q 2 .

Preferred groups of formula IV are, for example, 2-butyl (= 1-methyl-propyl), 2-methylbutyl, 2-methylpentyl, 3-methylpentyl, 2-ethylhexyl, 2-propylpentyl, especially 2-methylbutyl , 2-methylbutoxy, 2-methylpentoxy, 3-methylpentoxy, 2-ethylhexoxy, 1-methylhexoxy, 2-octyloxy, 2-oxa-3-methylbutyl, 3-oxa-4 -Methylpentyl, 4-methylhexyl, 2-hexyl, 2-octyl, 2-nonyl, 2-decyl, 2-dodecyl, 6-methoxyoctoxy, 6-methyloctoxy, 6-methyloctanoyl-oxy , 5-methylheptyloxycarbonyl, 2-methylbutyryloxy, 3-methylvaleroyloxy, 4-methylhexanoyloxy, 2-chloropropionyloxy, 2-chloro-3-methylbutyryloxy, 2 -Chloro-4-methylvaleryloxy, 2-chloro-3-methylvaleryloxy, 2-methyl-3-oxa-pentyl, 2-methyl-3-oxahexyl, 1-methoxypropyl-2-oxy, 1-ethoxypropyl-2-oxy, 1-propoxypropyl-2-oxy, 1-butoxypropyl-2-oxy, 2-fluorooctyloxy, 2-fluorodecyloxy, 1,1,1 -T Lyfluoro-2-octyloxy, 1,1,1-trifluoro-2-octyl, 2-fluoro-methyloctyloxy.

Another preferred compound of formula II contains a divalent Q group of formula V:

[Formula V]

Figure pct00074

Where

L, r, t, A * and B * have the meanings described above.

Another preferred compound of formula II contains a divalent Q group selected from:

Figure pct00075

Where

Phe represents phenyl optionally substituted with L or polysubstituted,

R x represents F or optionally fluorinated alkyl having 1 to 4 carbon atoms.

Particularly preferred compounds of formula II are selected from compounds of the following sub-formulas II1 to II11:

Figure pct00076

Figure pct00077

Figure pct00078

Figure pct00079

Where

L, P, Sp, m1, r and t have the meanings described above,

Z and A in each occurrence have the same or different meanings as defined for Z 1 and A 1 , respectively,

t1 represents 0 or 1 in each case the same or differently.

The chiral compounds of formula (II) can be used as optically active forms, ie pure enantiomers or any desired mixtures of two enantiomers, or racemates thereof. The use of racemates is preferred. The use of racemates has some advantages over the use of pure enantiomers, for example, in much lower synthesis complexity and lower material costs.

The following meanings apply above and below.

The term “mesogenic group” is known to the person skilled in the art and described in the literature and, due to its anisotropy and attraction of repulsive interactions, essentially induces a LC phase in low-molecular weight or polymeric materials. To contribute to the group. Compounds containing mesogenic groups ("mesogenic compounds") do not necessarily have to have an LC phase themselves. In addition, mesogenic compounds may exhibit LC phase behavior only after mixing with other compounds and / or after polymerization. Typical mesogenic groups are, for example, rigid rod-shaped or disc-shaped units. For an overview of the terms and definitions used in connection with mesogenic or LC compounds, see Pure Appl. Chem. 73 (5), 888 (2001) and C. Tschierske, G. Pelzl, S. Diele, Angew. Chem. 2004, 116, 6340-6368.

The term “spacer group”, also referred to above and hereinafter as “Sp”, is known to those skilled in the art, for example in Pure Appl. Chem. 73 (5), 888 (2001) and C. Tschierske, G. Pelzl, S. Diele, Angew. Chem. 2004, 116, 6340-6368. Unless otherwise indicated, the terms "spacer group" or "spacer" above and below denote flexible groups that connect mesogenic groups and polymerizable group (s) to each other in a polymerizable mesogenic compound ("RM").

The term "reactive mesogen" or "RM" refers to a compound containing a mesogenic group or one or more functional groups (also referred to as polymerizable groups or P groups) suitable for polymerization.

The terms "low-molecular weight compound" and "non-polymerizable compound" are generally monomeric compounds which do not contain any functional groups suitable for polymerization under ordinary conditions known to those skilled in the art, especially those used for the polymerization of RMs. Indicates.

The term "organic group" refers to a carbon group or a hydrocarbon group.

The term “carbon group” contains no further atoms at all (eg —C≡C—), or optionally with N, O, S, P, Si, Se, As, Te or Ge Monovalent or polyvalent organic groups containing one or more carbon atoms, such as containing one or more additional atoms (eg, carbonyl). The term "hydrocarbon group" denotes a carbon group which further contains one or more H atoms and optionally one or more heteroatoms such as, for example, N, O, S, P, Si, Se, As, Te or Ge.

"Halogen" refers to F, Cl, Br or I.

The carbon group or hydrocarbon group can be a saturated or unsaturated group. Unsaturated groups are, for example, aryl, alkenyl or alkynyl groups. Carbon or hydrocarbon radicals having three or more carbon atoms may be straight chain, branched and / or cyclic, and may also have spiro bonds or condensed rings.

The terms "alkyl", "aryl", "heteroaryl" and the like also include polyvalent groups such as alkylene, arylene, heteroarylene and the like.

The term "aryl" refers to an aromatic carbon group or a group derived therefrom. The term "heteroaryl" refers to "aryl" as defined above, containing one or more heteroatoms.

Preferred carbon groups and hydrocarbon groups are optionally substituted alkyl, alkenyl, alkynyl, alkoxy, alkylcarbonyl, alkoxy having 1 to 40, preferably 1 to 25, particularly preferably 1 to 18 carbon atoms Carbonyl, alkylcarbonyloxy and alkoxycarbonyloxy; Optionally substituted aryl or aryloxy having 6 to 40, preferably 6 to 25 carbon atoms; Or optionally substituted alkylaryl, arylalkyl, alkylaryloxy, arylalkyloxy, arylcarbonyl, aryloxycarbonyl, arylcarbonyloxy and aryl having 6 to 40, preferably 6 to 25 carbon atoms Oxycarbonyloxy.

Another preferred carbon and hydrocarbon group is C 1 -C 40 alkyl, C 2 -C 40 alkenyl, C 2 -C 40 alkynyl, C 3 -C 40 allyl, C 4 -C 40 alkyldienyl, C 4 -C 40 polyenyl, C 6 -C 40 aryl, C 6 -C 40 alkylaryl, C 6 -C 40 arylalkyl, C 6 -C 40 alkylaryloxy, C 6 -C 40 arylalkyloxy, C 2- C 40 heteroaryl, C 4 -C 40 cycloalkyl, C 4 -C 40 cycloalkenyl and the like. C 1 -C 22 alkyl, C 2 -C 22 alkenyl, C 2 -C 22 alkynyl, C 3 -C 22 allyl, C 4 -C 22 alkyldienyl, C 6 -C 12 aryl, C 6- Particular preference is given to C 20 arylalkyl and C 2 -C 20 heteroaryl.

Another preferred carbon and hydrocarbon group is unsubstituted or mono- or polysubstituted with F, Cl, Br, I or CN and one or more non-adjacent CH 2 groups are each independently of one another and the O and / or S atoms are directly -C (R x ) = C (R x )-, -C≡C-, -N (R x )-, -O-, -S-, -CO-, -CO-O- , A straight-chain, branched or cyclic alkyl radical having 1 to 40, preferably 1 to 25 carbon atoms, which may be replaced by -O-CO-, -O-CO-O-.

R x is preferably H; halogen; In addition, one or more non-adjacent carbon atoms may be replaced by —O—, —S—, —CO—, —CO—O—, —O—CO— or —O—CO—O—, and one or more H Straight, branched or cyclic alkyl chains having 1 to 25 carbon atoms, wherein the atoms may be replaced by fluorine; Optionally substituted aryl or aryloxy groups having 6 to 40 carbon atoms; Or an optionally substituted heteroaryl or heteroaryloxy group having 2 to 40 carbon atoms.

Preferred alkyl groups are, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, s-butyl, t-butyl, 2-methylbutyl, n-pentyl, s-pentyl, cyclopentyl, n- Hexyl, cyclohexyl, 2-ethylhexyl, n-heptyl, cycloheptyl, n-octyl, cyclooctyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, dodecaneyl, trifluoromethyl, Perfluoro-n-butyl, 2,2,2-trifluoroethyl, perfluorooctyl, perfluorohexyl and the like.

Preferred alkenyl groups are, for example, ethenyl, propenyl, butenyl, pentenyl, cyclopentenyl, hexenyl, cyclohexenyl, heptenyl, cycloheptenyl, octenyl, cyclooctenyl and the like.

Preferred alkynyl groups are, for example, ethynyl, propynyl, butynyl, pentynyl, hexynyl, octinyl and the like.

Preferred alkoxy groups are, for example, methoxy, ethoxy, 2-methoxy-ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, s-butoxy, t-butoxy, 2-methylbutoxy, n-pentoxy, n-hexoxy, n-heptyloxy, n-octyloxy, n-nonyloxy, n-decyloxy, n-undecyloxy, n-dodecyloxy and the like. .

Preferred amino groups are, for example, dimethylamino, methylamino, methylphenylamino, phenylamino and the like.

Aryl and heteroaryl groups can be monocyclic or polycyclic. That is, they may contain one ring (eg phenyl) or may contain two or more rings, which may also be fused (eg naphthyl) or covalently bonded (eg bi Phenyl), or a combination of fused and combined rings. Heteroaryl groups preferably contain one or more heteroatoms selected from O, N, S and Se.

Especially preferred of these are monocyclic, bicyclic or tricyclic aryl groups having 6 to 25 carbon atoms and monocyclic, bicyclic or tricyclic heteroaryl groups having 2 to 25 carbon atoms, which are optionally fused rings And optionally substituted. Even more preferred are 5-, 6- or 7-membered aryl and heteroaryl groups, in which one or more CH groups can be replaced by N, S or O in such a way that no O atoms and / or S atoms are directly connected to each other.

Preferred aryl groups are, for example, phenyl, biphenyl, terphenyl, [1,1 ': 3', 1 "] terphenyl-2'-yl, naphthyl, anthracene, binaphthyl, phenanthrene, pyrene, dihydro Pyrene, chrysene, perylene, tetracene, pentacene, benzopyrene, fluorene, indene, indenofluorene, spirobifluorene and the like.

Preferred heteroaryl groups are for example pyrrole, pyrazole, imidazole, 1,2,3-triazole, 1,2,4-triazole, tetrazole, furan, thiophene, selenophene, oxazole, isoxazole , 1,2-thiazole, 1,3-thiazole, 1,2,3-oxadiazole, 1,2,4-oxadiazole, 1,2,5-oxadiazole, 1,3,4 5-membered rings such as oxadiazole, 1,2,3-thiadiazole, 1,2,4-thiadiazole, 1,2,5-thiadiazole, 1,3,4-thiadiazole; Pyridine, pyridazine, pyrimidine, pyrazine, 1,3,5-triazine, 1,2,4-triazine, 1,2,3-triazine, 1,2,4,5-tetraazine, 1, 6-membered rings such as 2,3,4-tetraazine, 1,2,3,5-tetraazine; Or indole, isoindole, indolizine, indazole, benzimidazole, benzotriazole, purine, naftimidazole, phenanthrimidazole, pyridimidazole, pyrazineimidazole, quinoxaline imidazole, benzoxazole Sol, naphtoxazole, anthroxazole, phenanthroxazole, isoxazole, benzothiazole, benzofuran, isobenzofuran, dibenzofuran, quinoline, isoquinoline, putridine, benzo-5,6-quinoline, Benzo-6,7-quinoline, benzo-7,8-quinoline, benzoisoquinoline, acridine, phenothiazine, phenoxazine, benzopyridazine, benzopyrimidine, quinoxaline, phenazine, naphthyridine, azacarba Sol, benzocarboline, phenanthridine, phenanthroline, thieno [2,3b] thiophene, thieno [3,2b] thiophene, dithienothiophene, isobenzothiophene, dibenzothiophene, benzo Condensation groups such as thiadiazothiophene; Or a combination of these groups. Heteroaryl groups may also be substituted with alkyl, alkoxy, thioalkyl, fluorine, fluoroalkyl or further aryl groups or heteroaryl groups.

(Non-aromatic) alicyclic and heterocyclic groups include both saturated rings containing only single bonds, and partially unsaturated rings, which may also contain multiple bonds. The heterocyclic ring preferably contains one or more heteroatoms selected from Si, O, N, S and Se.

(Non-aromatic) alicyclic and heterocyclic groups may be monocyclic, i.e. contain only one ring (e.g. cyclohexane), or polycyclic, i.e. contain multiple rings (e.g., deca Hydronaphthalene or bicyclooctane). Especially preferred among these are saturated groups. Even more preferred are monocyclic, bicyclic or tricyclic groups with 3 to 25 carbon atoms, optionally containing fused rings and optionally substituted. In addition, one or more carbon atoms may be replaced by Si and / or one or more CH groups may be replaced by N and / or one or more non-adjacent CH 2 groups may be replaced by -O- and / or -S-. Even more preferred are 5-, 6-, 7- or 8-membered carbocyclic groups.

Preferred alicyclic and heterocyclic groups include, for example, 5-membered groups such as cyclopentane, tetrahydrofuran, tetrahydrothiofuran, pyrrolidine; 6 membered groups such as cyclohexane, silaneine, cyclohexene, tetrahydropyran, tetrahydrothiopyran, 1,3-dioxane, 1,3-dithiane, piperidine; 7 membered groups such as cycloheptane; And tetrahydronaphthalene, decahydronaphthalene, indene, bicyclo [1.1.1] pentane-1,3-diyl, bicyclo [2.2.2] octane-1,4-diyl, spiro [3.3] Fused groups such as heptane-2,6-diyl, octahydro-4,7-methanoydine-2,5-diyl.

Aryl, heteroaryl, carbon and hydrocarbon radicals are preferably silyl, sulfo, sulfonyl, formyl, amine, imine, nitrile, mercapto, nitro, halogen, C 1 -C 12 alkyl, C 6 -C 12 Optionally have one or more substituents selected from the group consisting of aryl, C 1 -C 12 alkoxy, hydroxyl or a combination of these groups.

Preferred substituents are for example solubility-promoting groups such as alkyl or alkoxy, electron-drawing groups such as fluorine, nitro or nitrile, or substituents for increasing the glass transition temperature (Tg) of the polymer, in particular for example bulk groups such as t-butyl or optionally substituted aryl groups.

Further preferred substituents, also referred to hereinafter as "L", are for example F, Cl, Br, I, -CN, -NO 2 , -NCO, -NCS, -OCN, -SCN, -C (= O) N (R x ) 2 , -C (= O) Y 1 , -C (= O) R x , -N (R x ) 2 (where R x has the meanings described above and Y 1 is halogen Optionally substituted silyl or aryl having 6 to 40, preferably 6 to 20 carbon atoms, and straight or branched chain alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, having 1 to 25 carbon atoms, Alkylcarbonyloxy or alkoxycarbonyloxy, wherein one or more H atoms are optionally replaced by F or Cl.

"Substituted silyl or aryl" is preferably halogen, -CN, R O , -OR O , -CO-R O , -CO-OR O , -O-CO-R O , or -O-CO-OR Meaning substituted with O (wherein R O has the meanings described above).

Particularly preferred substituents L are for example F, Cl, CN, NO 2 , CH 3 , C 2 H 5 , OCH 3 , OC 2 H 5 , COCH 3 , COC 2 H 5 , COOCH 3 , COOC 2 H 5 , CF 3 , OCF 3 , OCHF 2 , OC 2 F 5 , and also phenyl.

Figure pct00080
Is preferably
Figure pct00081
Where L has one of the meanings described above.

The polymerizable group P is a group suitable for free-radical or ionic chain polymerization, polymerization reactions such as polymerisation or polycondensation, or polymer-like reactions such as addition or condensation into the polymer backbone. Particular preference is given to groups for chain polymerization, in particular those containing C═C double bonds or C≡C triple bonds and groups suitable for polymerization by ring opening, such as oxetane or epoxide groups.

Preferred polymerizable groups

Figure pct00082
, CH 2 = CW 2- (O) k3- , CW 1 = CH-CO- (O) k3- , CW 1 = CH-CO-NH-, CH 2 = CW 1 -CO-NH-, CH 3- CH = CH-O-, (CH 2 = CH) 2 CH-OCO-, (CH 2 = CH-CH 2 ) 2 CH-OCO-, (CH 2 = CH) 2 CH-O-, (CH 2 = CH-CH 2 ) 2 N-, (CH 2 = CH-CH 2 ) 2 N-CO-, HO-CW 2 W 3- , HS-CW 2 W 3- , HW 2 N-, HO-CW 2 W 3 -NH-, CH 2 = CW 1 -CO-NH-, CH 2 = CH- (COO) k1 -Phe- (O) k2 -, CH 2 = CH- (CO) k1 -Phe- (O) k2 -, Phe-CH = CH-, HOOC-, OCN- and W 4 W 5 W 6 Si-, wherein W 1 is H, F, Cl, CN, CF 3 , phenyl or 1 to 5 carbon atoms Alkyl having a formula, in particular H, F, Cl or CH 3 , W 2 And W 3 each independently represent H or alkyl having 1 to 5 carbon atoms, in particular H, methyl, ethyl or n-propyl, W 4 , W 5 And W 6 each independently represent Cl, oxaalkyl or oxacarbonylalkyl having 1 to 5 carbon atoms, and W 7 and W 8 each independently represent H, Cl or 1 to 5 carbon atoms Alkyl, Phe represents 1,4-phenylene optionally substituted by one or more radicals L as defined above, k 1 , k 2 And k 3 are each independently 0 or 1, preferably k 3 represents 1 and k 4 is an integer from 1 to 10.

Particularly preferred P groups are CH 2 = CH-COO-, CH 2 = C (CH 3 ) -COO-, CH 2 = CF-COO-, CH 2 = CH-, CH 2 = CH-O-, (CH 2 = CH) 2 CH-OCO-, (CH 2 = CH) 2 CH-O-,

Figure pct00083
And
Figure pct00084
And especially vinyloxy, acrylate, methacrylate, fluoroacrylate, chloroacrylate, oxetane and epoxide.

In a further preferred embodiment of the invention, the polymerizable compounds of formulas (I) and (II), and their sub-formulas, contain at least two polymerizable groups P (multifunctional polymerizable radicals) instead of one or more radicals -P-Sp-. It contains one or more branched radicals containing. Suitable radicals of this type and polymerizable compounds containing them are disclosed in US 7,060,200 B1 or US 2006/0172090 A1. Particular preference is given to multifunctional polymerizable radicals selected from the formulas I * a to I * k:

Figure pct00085

Where

Alkyl is a single bond, or straight or branched chain alkylene having 1 to 12 carbon atoms, wherein one or more non-adjacent CH 2 groups are each independently of one another in such a way that no O and / or S atoms are directly connected to each other; C (R x ) = C (R x )-, -C≡C-, -N (R x )-, -O-, -S-, -CO-, -CO-O-, -O-CO- , -O-CO-O-, and also one or more H atoms can be replaced by F, Cl or CN, where R x has the meanings mentioned above, preferably as defined above Represent the same R 0 ,

aa and bb each independently represent 0, 1, 2, 3, 4, 5 or 6,

X has one of the meanings described for X ',

P 1 To P 5 each independently of one another has one of the meanings described for P.

Preferred spacer group Sp is selected from the formula Sp'-X 'such that the radical "P-Sp-" corresponds to the formula "P-Sp'-X'-",

Sp 'represents alkylene having 1 to 20, preferably 1 to 12 carbon atoms, which is optionally mono- or polysubstituted with F, Cl, Br, I or CN and also at least one non-adjacent CH 2 groups are each independently selected from O and / or S atoms in ways that are not directly connected to each other -O-, -S-, -NH-, -NR O together -, -SiR R O OO -, -CO-, - COO-, -OCO-, -OCO-O-, -S-CO-, -CO-S-, -NR O -CO-O-, -O-CO-NR O- , -NR O -CO-NR O- , -CH = CH- or -C≡C- can be replaced,

X 'is -O-, -S-, -CO-, -COO-, -OCO-, -O-COO-, -CO-NR O- , -NR O -CO-, -NR O -CO-NR O -, -OCH 2 -, -CH 2 O-, -SCH 2 -, -CH 2 S-, -CF 2 O-, -OCF 2 -, -CF 2 S-, -SCF 2 -, -CF 2 CH 2- , -CH 2 CF 2- , -CF 2 CF 2- , -CH = N-, -N = CH-, -N = N-, -CH = CR O- , -CY 2 = CY 3- , -C≡C-, -CH = CH-COO-, -OCO-CH = CH- or a single bond,

R O and R OO each independently represent H or alkyl having 1 to 12 carbon atoms,

Y 2 and Y 3 each independently represent H, F, Cl or CN.

X 'is preferably -O-, -S-, -CO-, -COO-, -OCO-, -O-COO-, -CO-NR O- , -NR O -CO-, -NR O- CO-NR O -or a single bond.

Typical spacer groups Sp ′ are, for example, — (CH 2 ) p 1 —, — (CH 2 CH 2 O) q 1 —, —CH 2 CH 2 —, —CH 2 CH 2 —S—CH 2 CH 2 —, — CH 2 CH 2 -NH-CH 2 CH 2 -or-(SiR O R OO -O) p1- (where p1 is an integer from 1 to 12, q1 is an integer from 1 to 3, R O and R OO Has the meaning described above).

A particularly preferred group -X'-Sp'- is - (CH 2) p1 -, -O- (CH 2) p1 -, -OCO- (CH 2) p1 -, -OCOO- (CH 2) p1 - a.

Particularly preferred groups Sp 'are in each case straight chain ethylene, propylene, butylene, pentylene, hexylene, heptylene, octylene, nonylene, decylene, undecylene, dodecylene, octadecylene, ethylene Oxyethylene, methyleneoxybutylene, ethylenethioethylene, ethylene-N-methyliminoethylene, 1-methylalkylene, ethenylene, propenylene and butenylene.

Polymerizable compounds are known to those skilled in the art and are described in standard work in organic chemistry, for example in Houben-Weyl, Methoden der organischen Chemie [Methods of Organic Chemistry], Thieme-Verlag, Stuttgart. It is manufactured similarly to the present process. The synthesis of polymerizable acrylates and methacrylates of formula (I) can be carried out analogously to the process described in US Pat. No. 5,723,066. In addition, particularly preferred methods are shown in the following examples.

In the simplest case, this synthesis is a commercially available formula, for example 2,6-dihydroxynaphthalene (naphthalene-2,6-diol) or 1- (4-hydroxyphenyl) phenyl-4-ol HO-a 1 - (Z 1 -A 2) m1 -OH the diols of (wherein, a 1, a 2, Z 1 and m have the meaning described above), for example, DCC (dicyclohexyl In the presence of a dehydrating agent such as carbodiimide), for example by esterification or etherification with the corresponding acid, acid derivative or halogenated compound containing P group, such as methacryloyl chloride or methacrylic acid .

The polymerizable compound is polymerized or crosslinked by in situ polymerization in the LC medium between the substrates of the LC display with the application of a voltage (if the compound contains two or more polymerizable groups). Suitable and preferred polymerization methods are, for example, thermal polymerization or photopolymerization, preferably photopolymerization, in particular UV photopolymerization. To this, one or more initiators may be added if necessary. Suitable polymerization conditions, and suitable types and amounts of initiators are known to those skilled in the art and are described in the literature. Suitable initiators for the free-radical polymerization are, for example, Igacure® 651, Igacure® 184, Igacure® 907, Igacure® 369, a commercially available photoinitiator. Or Darocure 1173 (Ciba AG). If an initiator is used, its proportion in the total mixture is preferably 0.001 to 5% by weight, particularly preferably 0.001 to 1% by weight. However, this polymerization can also occur without the addition of initiators. In a further preferred embodiment, the LC medium does not comprise a polymerization initiator.

The polymerizable component or LC medium may also comprise one or more stabilizers to prevent unwanted spontaneous polymerization of the RMs, for example during storage or transportation. Suitable types and amounts of stabilizers are known to those skilled in the art and are described in the literature. Particularly suitable are, for example, stabilizers of the commercially available Irganox® family (Sivage). If stabilizers are used, their proportions are preferably 10 to 5000 ppm, particularly preferably 50 to 500 ppm, based on the total amount of RM or polymerizable component (A).

The polymerizable compounds according to the invention are also suitable for polymerization without initiators, which are associated with significant advantages such as, for example, low contamination of the LC medium by low material costs and in particular possible residual amounts of initiator or degradation products thereof.

The LC medium according to the invention preferably comprises less than 5%, particularly preferably less than 1%, very particularly preferably less than 0.5% of polymerizable compounds, in particular polymerizable compounds of the abovementioned formulas.

The polymerizable compounds according to the invention can be added individually to the LC medium, but it is also possible to use mixtures comprising two or more polymerizable compounds. Copolymers are formed upon polymerization of this type of mixture. The invention also relates to the polymerizable mixtures mentioned above and below.

The LC media which can be used according to the invention are prepared in a conventional manner, for example by mixing one or more of the abovementioned compounds with one or more polymerizable compounds as defined above and optionally further liquid crystal compounds and / or additives. Are manufactured. In general, the desired amount of the component used in smaller amounts is advantageously dissolved in the main component at elevated temperatures. It is also possible to mix solutions of the components in organic solvents such as acetone, chloroform or methanol and then remove the solvent again, for example by distillation, after complete mixing. The invention also relates to a process for the preparation of an LC medium according to the invention.

It is natural to those skilled in the art that the LC medium according to the invention may comprise a compound, for example where H, N, O, Cl, F have been replaced by the corresponding isotope.

The structure of the LC display according to the invention corresponds to the conventional geometry for PSA displays as described in the prior art cited above. Geometries without protrusions, in particular also geometries, in which the electrodes on the color filter face are not structured and only the electrodes on the TFT face have slits. Particularly suitable and preferred electrode structures for PS-VA displays are described, for example, in US 2006/0066793 A1.

Unless the context clearly indicates otherwise, plural forms of terms used herein should be interpreted to include the singular forms, and vice versa.

As used throughout the specification and claims herein, the terms "comprises" and "comprises" and variations thereof, such as "comprising" and "comprising", include "including but not limited to". It does not (intentionally) exclude other components.

Modifications to the above embodiments of the invention are possible and are also contemplated as being within the scope of the invention. Unless stated otherwise, each feature disclosed herein may be replaced by alternative features serving the same, equivalent, or similar purpose. Therefore, unless stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

All of the features disclosed herein may be combined in any combination, except where at least some of the features and / or steps disclosed herein are mutually exclusive. In particular, the preferred features of the invention can be applied to all aspects of the invention and can be used in any combination. Similarly, features described in non-essential combinations may be used separately (not in combination).

The following examples illustrate the invention without limitation. However, those skilled in the art will appreciate the preferred mixture concepts having the compounds used preferably and their individual concentrations and combinations with each other. In addition, the following examples illustrate the properties and combinations of properties that may be used.

In the following table the following abbreviations are used:

(n, m, z are each independently 1, 2, 3, 4, 5 or 6)

TABLE A

Figure pct00086

Figure pct00087

Figure pct00088

Figure pct00089

In a preferred embodiment of the invention, the LC medium according to the invention comprises at least one compound selected from the group consisting of the compounds of Table A above.

Table B below shows the possible chiral dopants that can be added to the LC medium according to the invention.

TABLE B

Figure pct00090

Figure pct00091

The LC medium preferably comprises 0 to 10% by weight, in particular 0.01 to 5% by weight, particularly preferably 0.1 to 3% by weight of dopants. The LC medium preferably comprises at least one dopant selected from the group consisting of the compounds of Table B above.

Table C below shows the possible stabilizers that can be added to the LC medium according to the invention. (Where n represents an integer of 1 to 12)

TABLE C

Figure pct00092

Figure pct00093

Figure pct00094

Figure pct00095

Figure pct00096

The LC medium preferably comprises 0 to 10% by weight, in particular 0.01 to 5% by weight, particularly preferably 0.1 to 3% by weight of stabilizer. The LC medium preferably comprises one or more stabilizers selected from the group consisting of the compounds of Table C above.

In addition, the following abbreviations and symbols are used:

V 0 represents the capacitive threshold voltage [V] at 20 ° C.

n e represents the extraordinary refractive index at 20 ° C. and 589 nm.

n 0 represents the normal refractive index at 20 ° C. and 589 nm.

Δn shows optical anisotropy at 20 ° C. and 589 nm.

ε represents the permittivity perpendicular to the director at 20 ° C. and 1 kHz.

ε shows the dielectric constant parallel to the director at 20 ° C. and 1 kHz.

Δε represents dielectric anisotropy at 20 ° C and 1 kHz.

cl.p., T (N, I) represents clear point [degreeC].

γ 1 represents the rotational viscosity [mPa.s] at 20 ° C.

K 1 represents the elastic constant at 20 ° C., “splay” strain [pN].

K 2 represents the elastic constant at 20 ° C., the “twist” strain [pN].

K 3 represents the elastic constant at 20 ° C., “bend” strain [pN].

LTS represents the low temperature stability (phase) measured in the test cell.

HR 20 represents the voltage holding ratio [%] at 20 ° C.

HR 100 represents the voltage holding ratio [%] at 100 ° C.

Unless expressly stated otherwise, all concentrations herein are expressed in weight percent and relate to the corresponding mixture or mixture component.

Unless expressly stated otherwise, all temperature values described herein, for example melting point T (C, N), transition temperature from Smectic (S) to nematic (N) and T.S. T (N, I) is expressed in degrees Celsius (° C.).

Unless otherwise stated in each case, all physical properties are described in "Merck Liquid Crystals, Physical Properties of Liquid Crystals", Status Nov. 1997, Merck KGaA, Germany], apply for a temperature of 20 ° C., Δn is measured at 589 nm and Δε is measured at 1 kHz.

In the present invention, the term "threshold voltage" relates to a capacitive threshold (V 0 ), also referred to as a Freedericks threshold, unless explicitly stated otherwise. In an embodiment it may generally be represented by an optical threshold V 10 for 10% relative contrast.

The display used to measure the capacitive threshold voltage includes two flat-parallel outer plates separated by 4 μm, and rubbed electrode layers on the inner surface of the outer plate and the top thereof, causing homeotropic edge alignment of liquid crystal molecules. It has a polyimide alignment layer.

The polymerizable compound is polymerized in the display by UV irradiation for a predetermined time while simultaneously applying a voltage (typically 10 to 30 V alternating current, 1 kHz) to the display. In the examples, unless otherwise stated, a 28 mW / cm 2 mercury vapor lamp was used and the intensity was measured using a standard UV meter (Ushio UNI meter) equipped with a 365 nm band-pass filter. .

Tilt angles were measured by rotational crystal experiments (Autronic-Melchers TBA-105). Here, a small value (ie, a value with a large deviation at a 90 ° angle) corresponds to a large tilt.

Example  One

LC media consisting of the following components a) to c) are suitable for use in PS-VA displays:

a) 99.00% nematic LC host mixture N1 having the composition shown below:

Figure pct00097

b) 0.25% of the polymerizable monomeric compound A shown below:

Figure pct00098

c) chiral dopant S-4011 0.75%.

Example  2

LC media consisting of 99.50% nematic LC host mixture N1 (see Example 1) and 0.50% polymerizable monomeric compound A (see Example 1) are suitable for use in PS-VA displays.

Example  2

The LC medium consisting of 99.50% nematic LC host mixture N1 (see Example 1), 0.25% polymerizable monomeric compound A (see Example 1), and 0.25% chiral dopant S-5011 Suitable for use in displays.

Example  3

LC media consisting of 99.00% nematic LC host mixture N1 (see Example 1), 0.25% polymerizable monomeric compound B shown below, and 0.75% chiral dopant S-4011 was used for PS-VA display Suitable for

Figure pct00099

Example  4

An LC medium consisting of 99.50% nematic LC host mixture N1 (see Example 1) and 0.50% of polymerizable monomeric compound C shown below is suitable for use in PS-VA displays.

Figure pct00100

Example  5

LC medium consisting of 99.00% nematic LC host mixture N1 (see Example 1), 0.25% of polymerizable monomeric compound D shown below, and 0.75% of chiral dopant S-2011 is used in PS-VA display Suitable for

Figure pct00101

Claims (10)

  1. A polymerizable component comprising at least one polymerizable compound, and
    Nematic ingredients
    As a liquid crystal (LC) medium comprising:
    Wherein said nematic component contains 90 to 100% by weight of at least one compound comprising at least one 1,4-phenylene group substituted in the 2- and 3-positions by F and / or Cl (LC) medium.
  2. The method of claim 1,
    LC medium, wherein said nematic component contains 90 to 100% by weight of a compound selected from the group consisting of the formulas CY, PY and TY:
    Figure pct00102

    Wherein each radical has the following meaning:
    a represents 1 or 2,
    b represents 0 or 1,
    Figure pct00103
    Is
    Figure pct00104
    Indicates
    Figure pct00105
    Independently of each other
    Figure pct00106
    , But
    Figure pct00107
    One or more of
    Figure pct00108
    Lt; / RTI >
    R 1 and R 2 each independently represent an alkyl or alkenyl having 1 to 12 carbon atoms, wherein one or two non-adjacent CH 2 groups are also -O- in such a way that no O atoms are directly connected to each other. , -CH = CH-, -CO-, -OCO- or -COO-,
    R 5 and R 6 each independently of one another have one of the meanings described above for R 1 ,
    Z x is -CH = CH-, -CH 2 O-, -OCH 2 -, -CF 2 O-, -OCF 2 -, -O-, -CH 2 -, -CH 2 CH 2 - or a single bond, Preferably represents a single bond,
    L 1 -4 represents each independently F or Cl from each other,
    L 5 and L 6 each independently represent F, Cl, OCF 3 , CF 3 , CH 3 , CH 2 F or CHF 2 .
  3. The method according to claim 1 or 2,
    LC medium comprising at least one compound selected from the group consisting of compounds of the formulas CY1 to CY28:
    Figure pct00109

    Figure pct00110

    Figure pct00111

    Figure pct00112

    Where
    a represents 1 or 2, alkyl and alkyl * each independently represent a straight chain alkyl radical having 1 to 6 carbon atoms, alkenyl represents a straight chain alkenyl radical having 2 to 6 carbon atoms, (O ) Represents an oxygen atom or a single bond.
  4. The method according to any one of claims 1 to 3,
    LC medium comprising at least one compound selected from the group consisting of compounds of the formulas PY1 to PY20
    Figure pct00113

    Figure pct00114

    Figure pct00115

    Where
    Alkyl and alkyl * each independently represent a straight chain alkyl radical having 1 to 6 carbon atoms, alkenyl represents a straight chain alkenyl radical having 2 to 6 carbon atoms, and (O) represents an oxygen atom or a single bond Indicates.
  5. The method according to any one of claims 1 to 4,
    LC medium comprising at least one compound selected from the group consisting of compounds of the formulas TY1 to TY18
    Figure pct00116

    Figure pct00117

    Figure pct00118

    Where
    R represents straight chain alkyl or alkoxy having 1 to 7 carbon atoms, R * represents straight chain alkenyl radical having 2 to 7 carbon atoms, (O) represents an oxygen atom or a single bond, and m is 1 The integer of -6 is shown.
  6. 6. The method according to any one of claims 1 to 5,
    LC media, wherein said polymerizable compound is selected from compounds of formula (I) or (II)
    (I)
    Figure pct00119

    [Formula II]
    Figure pct00120

    Wherein each radical has the following meaning:
    R a and R b each independently represent P-Sp-, H, halogen, SF 5 , NO 2 , a carbon group or a hydrocarbon group, at least one of the radicals R a and R b represents P-Sp-,
    P represents, in each case, the same or differently, a polymerizable group,
    Sp represents, in each case, identically or differently, a spacer group or a single bond,
    A 1 and A 2 each independently represent an aromatic, heteroaromatic, cycloaliphatic or heterocyclic group having 4 to 25 carbon atoms, which may also contain fused rings, optionally to L Mono- or polysubstituted by
    Z 1 is the same or different at each occurrence: -O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-, -OCH 2- , -CH 2 O-, -SCH 2- , -CH 2 S-, -CF 2 O-, -OCF 2- , -CF 2 S-, -SCF 2 -,-(CH 2 ) n 1-, -CF 2 CH 2- , -CH 2 CF 2 -,-(CF 2 ) n 1-, -CH = CH-, -CF = CF-, -C≡C-, -CH = CH-COO-, -OCO-CH = CH-, CR 0 R 00 or a single bond,
    L represents P-Sp-, H, OH, CH 2 OH, halogen, SF 5 , NO 2 , carbon group or hydrocarbon group,
    R 0 and R 00 each independently represent H or alkyl having 1 to 12 carbon atoms,
    m1 represents 0, 1, 2, 3 or 4,
    n1 represents 1, 2, 3 or 4,
    R * has, at each occurrence, the same or different, having one of the meanings described for R a in Formula (I),
    Q represents a k-valent chiral group optionally substituted by L, mono- or polysubstituted,
    k represents 1, 2, 3, 4, 5 or 6.
  7. LC medium which is a nematic component as defined in claim 1.
  8. Use of an LC medium according to any of the preceding claims for use in LC displays.
  9. An LC display comprising the LC medium according to claim 1, which is preferably a display in VA, MVA, PS, PSA, PS-VA or PS-IPS mode.
  10. The method of claim 9,
    Two substrates, wherein the at least one substrate is translucent and the at least one substrate has one or two electrode layers thereon, and two electrodes; And
    A polymerized component and a low-molecular weight component located between the substrates, wherein the polymerized component polymerizes one or more polymerizable compounds in an LC medium between substrates of a display cell while applying a voltage to the electrodes. LC medium layer, which can be obtained, wherein the low-molecular weight component is the nematic component according to any one of claims 1 to 5.
    An LC display, comprising a display cell comprising a.
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