JP2003301179A - Liquid crystal composition and liquid crystal display element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a liquid crystal composition having a general characteristic necessary for the composition, a nematic phase, particularly large optical anisotropy and a positive dielectric constant anisotropy, and to provide a liquid crystal display element containing the composition and having the general characteristic necessary for the element. <P>SOLUTION: The liquid crystal composition contains at least one compound represented by formula (I) as a first component and at least one compound selected from a compound group represented by formula (II-1) to (II-3), and the like, as a second component, and the liquid crystal display element contains the composition (wherein R<SP>1</SP>and R are each a 1-10C alkyl group or the like; X<SP>1</SP>to X<SP>12</SP>are each independently hydrogen or fluorine and at least 2 of X<SP>1</SP>to X<SP>12</SP>are fluorine; A is 1,4-phenylene or 1,4-cyclohexylene; Y<SP>1</SP>is fluorine or OCF<SB>3</SB>and Y<SP>2</SP>is fluorine or chlorine; Z is single bond or C<SB>2</SB>H<SB>4</SB>; and (n) is 0, 1 or 2). <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a liquid crystal composition having a nematic phase and a positive dielectric anisotropy, and a liquid crystal display device containing this liquid crystal composition. The present invention is
The present invention relates to a liquid crystal display device having a particularly small cell gap and a liquid crystal composition having a large optical anisotropy.

[0002]

2. Description of the Related Art In a liquid crystal display element, the classification based on the operation mode of the liquid crystal is PC (phase change), TN (tw
isted nematic), IPS (in-plane switching), S
TN (super twisted nematic), OCB (optically c
ompensated bend), ECB (electrically controlled)
birefringence), VA (vertical alignment), and the like. Classification based on the drive system of the element is PM (passiv
e matrix) and AM (active matrix). PM (pas
sive matrix) is classified into static (static) and multiplex (multiplex), and AM is TFT (t
hin film transistor), MIM (metal insulator met)
al) etc.

These devices contain a liquid crystal composition having suitable properties. In order to improve the general properties of the device, the composition requires the following general properties. No. General characteristics of composition General characteristics of device 1. Heat stable, long life 2. UV stable ¹⁾ Long life 3. Wide range of nematic phase Wide range of usable temperature 4. Low viscosity ²⁾ Short response time 5. Low threshold voltage Low power consumption 6. High specific resistance High voltage holding ratio 1) Ultraviolet rays can be used in the manufacturing process. 2) The time for injecting the composition into the liquid crystal cell is short.

No. 1 in the composition used for the AM device. The characteristics 1 to 6 are important. No. 1 in the composition used for the PM element. 1
The characteristics of ~ 5 are important. In addition to these characteristics, characteristics such as optical anisotropy (Δn), dielectric anisotropy (Δε) and elastic constant are important. The appropriate value of the characteristic depends on the mode of the device. When the composition is put into a liquid crystal cell having an alignment film, the action of the alignment film causes liquid crystal molecules to rise. The amount of rising is the pretilt angle. This angle also depends on the type of composition. The large pretilt angle allows liquid crystal molecules to be stably aligned.

Recently, a technology for producing a substrate used for a device has been developed, so that a cell gap tends to be small. The cell gap is particularly small in AM devices such as TN mode and OCB mode. The cell gap is the distance between the two substrates and is the same as the thickness of the layer of the liquid crystal composition. In a TN mode device, a smaller cell gap shortens the response time, and a reverse domain is less likely to occur. In the OCB mode, when the cell gap is reduced, the time required for transition from the spray alignment to the bend alignment (transition time) is shortened, and the time required for the liquid crystal molecules to change the alignment due to the change in the applied voltage (response time) is shortened.

In these modes, the product (Δn × d) of the optical anisotropy (Δn) and the cell gap (d) is constant. Therefore, in order to reduce the cell gap, a composition having large optical anisotropy is required. Compositions having a large optical anisotropy are disclosed in JP 2001-3053 A and JP 2001 A.
-3051, JP 2001-123170 A, and JP 4-257535 A.
However, new compositions having large optical anisotropy and appropriate properties are constantly required to improve the properties of devices.

[0007]

The object of the present invention is to provide compositions having the general properties required for the composition, a nematic phase, in particular a large optical anisotropy, and a positive dielectric anisotropy, and An object of the present invention is to provide a liquid crystal display device containing the composition and having general properties required for the device.

[0008]

Means for Solving the Problems As a result of studies to solve these problems, the present inventors have found out the following. The composition of the present invention has the general properties required for the composition, a nematic phase, especially high optical anisotropy, and a positive dielectric anisotropy. A liquid crystal display device containing this composition has general characteristics required for the device. It has also been found that this composition is suitable for devices having a small cell gap and is particularly suitable for AM devices having a small cell gap. Modes for achieving the object of the present invention are as described in Items 1 to 5. With regard to the substituents of the compound that is a component of the composition, preferred embodiments are also described.

1. A first component consisting of at least one compound selected from the group of compounds represented by formula (I), and at least one selected from the group of compounds represented by formulas (II-1) to (II-8) A liquid crystal composition containing a second component comprising a compound. In the formula (I), R ¹ is alkyl having 1 to 10 carbons,
Alkoxy having 1 to 10 carbons or alkenyl having 2 to 10 carbons; X ^{1 to} X ¹² are independently hydrogen or fluorine, at least two of X ^{1 to} X ¹² are fluorine, and one When 1,4-phenylene has two fluorines, the fluorine positions are the 2 and 5 positions, or the 2 and 6 positions; and n is 0, 1 or 2.

Preferred R ¹ is methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, heptyloxy, vinyl, 1-propenyl, 2-propenyl. , 1-butenyl,
2-butenyl, 3-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 1-hexenyl, 2-hexenyl, 3-hexenyl, 4-hexenyl, and 5-hexenyl. Of the alkyls, alkoxys and alkenyls, the preferred R ¹ is alkyl. More preferred alkyl is ethyl, propyl and pentyl.

When one 1,4-phenylene has two fluorines, the combination at the fluorine position is 2
There are three positions: third and third, second and fifth, and second and sixth.
Of these, 1,4-phenylene in which the 2- and 5-positions are fluorine is preferable. 1,4-where the 2nd and 6th positions are fluorine
Phenylene is also preferred. 2nd and 3rd place are fluorine 1,
Compounds having 4-phenylene are not preferred as the first component. It preferred that the total number of fluorine in X ¹ to X ^{1 2} is two to five. More preferred total numbers are two and three.

N is 0, 1 or 2. When n is 0, the compound (I) has 2 rings. When n is 1, the compound (I) has 3 rings. When n is 2, the compound (I) has 4 rings as shown below. This compound has two X ⁵ . These are independently hydrogen or fluorine. That is, they may be the same or different. The same applies to X ⁶ , X ⁷ and X ⁸ .

[0013]

In the formulas (II-1) to (II-8), R is
Alkyl having 1 to 10 carbon atoms; A is 1,4-phenyl
Len or 1,4-cyclohexylene; X¹, X
^TwoAnd X^ThreeAre independently hydrogen or fluorine; Y¹
Is fluorine or -OCF_ThreeAnd Y^TwoIs fluorine
Or chlorine; and Z is a single bond or -C_TwoH _Four
-, And n is 0 or 1.

Preferred R is methyl, ethyl or propyl
Ru, butyl, pentyl, hexyl, heptyl, octyl
Is. More preferred R is ethyl, propyl and pet
It is a still. In formulas (II-1) to (II-8),
The symbol R was used for multiple compounds. The meaning of these R is
It may be the same or different. A, X¹, X
^Two, X^Three, Y¹, And n symbols have similar meanings
It

2. The first component is 5 to 50% by weight, and the second component is 30 to 95, based on the total weight of the liquid crystal composition.
Item 2. The liquid crystal composition according to item 1, which is% by weight.

3. Item 3. The liquid crystal composition according to item 1 or 2, further containing a third component consisting of at least one compound selected from the group of compounds represented by formula (III). R'is alkyl having 1 to 10 carbons or 2 to 10 carbons
Is alkoxymethyl, R is alkyl having 1 to 10 carbons; A is 1,4-phenylene or 1,4-cyclohexylene; and X ¹ and X ² are independently hydrogen or fluorine. is there.

Preferred R'is methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, methoxymethyl, ethoxymethyl, propoxymethyl, butoxymethyl, and pentyloxymethyl. Among alkyl and alkoxymethyl, the preferred R'is alkyl. More preferred alkyl is ethyl, propyl and pentyl.

4. Item 4. The liquid crystal composition according to item 3, wherein the third component is 40% by weight or less based on the total weight of the liquid crystal composition. 5. Item 1. A liquid crystal display device containing the liquid crystal composition according to any one of items 1 to 4.

The compound represented by the formula (I) may be referred to as the compound (I). Compounds represented by other formulas may be referred to in the same manner. The liquid crystal composition of the present invention or the liquid crystal display device of the present invention may be referred to as a composition or device, respectively. The liquid crystal display element is a general term for a liquid crystal display panel and a liquid crystal display module.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a composition having general properties required for a composition, and particularly having a large optical anisotropy, and a device having the properties required for a device. The main characteristics of the compound, which is a component in the composition of the present invention,
The major effects that occur on the composition when the compound is added to the composition, and the preferred proportions of the compounds are described. The maximum temperature of the nematic phase and the minimum temperature of the nematic phase are abbreviated as the maximum temperature and the minimum temperature, respectively.

The first component is compound (I). The compound (I) is stable to heat and ultraviolet rays, has a relatively high maximum temperature, has a low viscosity, and has a very large optical anisotropy.
It has characteristics that the dielectric anisotropy is almost zero and the specific resistance is large. This compound has the effects of adjusting the maximum temperature in the composition, lowering the viscosity, particularly increasing the optical anisotropy, and increasing the voltage holding ratio. The composition containing this compound produces a large pretilt angle due to the alignment film.

The second component is compounds (II-1) to (II-
8). These compounds have characteristics that they are stable to heat and ultraviolet rays, have relatively large optical anisotropy, and have large specific resistance. These compounds have the effects of controlling the optical anisotropy in the composition and increasing the voltage holding ratio.

The compound (II-1) has the characteristics of low viscosity and very high dielectric anisotropy. This compound further has the effect of lowering the viscosity in the composition, and especially of lowering the threshold voltage. Compound (II-2)
Has a high maximum temperature and a large dielectric anisotropy. This compound further has the effect of raising the maximum temperature and lowering the threshold voltage in the composition. The compound (II-3) has the characteristics that the maximum temperature is high and the dielectric anisotropy is relatively large. This compound has the effect of increasing the maximum temperature in the composition and controlling the dielectric anisotropy.

The compound (II-4) has characteristics that the maximum temperature is very high, the optical anisotropy is large, and the dielectric anisotropy is very large. This compound further has the effects of raising the maximum temperature in the composition, increasing the optical anisotropy, and particularly lowering the threshold voltage. The compound (II-5) has the characteristics that the maximum temperature is high and the dielectric anisotropy is relatively large. This compound further has the effect of increasing the maximum temperature in the composition and adjusting the threshold voltage. Compounds (II-6) to (II-8)
Has a characteristic that the dielectric anisotropy is relatively high. This compound also has the effect of adjusting the threshold voltage in the composition.

The third component is the compound (III-1) or (I
II-2). These compounds have characteristics that they are stable to heat and ultraviolet rays, have very large optical anisotropy, have almost zero dielectric anisotropy, and have large specific resistance. These compounds are effective in increasing the optical anisotropy in the composition and increasing the voltage holding ratio. The composition containing this compound produces a large pretilt angle due to the alignment film. The compound (III-1) has the characteristic that the maximum temperature is very high. This compound further has the effect of particularly increasing the maximum temperature in the composition. The compound (III-2) has a characteristic that the maximum temperature is relatively high. This compound further has the effect of adjusting the maximum temperature in the composition.

The preferred ratio of the compound which is a component of the composition is as follows. Percentages are weight percentages (wt%) based on the total weight of the composition. The preferable ratio of the compound (I) as the first component is 5% or more for increasing the optical anisotropy, and 50% or less for decreasing the threshold voltage. A more desirable ratio is 10% to 40
%. Compounds (II-1) to (II-
The preferable ratio of 8) is 3 in order to reduce the threshold voltage.
It is 0% or more, and is 95% or less in order to lower the minimum temperature. A more desirable ratio is 40% to 95%. A desirable ratio of the compound (III) as the third component is 40% or less in order to lower the minimum temperature. A more desirable ratio is 1% to 40%. A particularly desirable ratio is 1% to 3
It is 0%.

The preferred embodiments of the compound which is a component of the composition will be further described. Preferred compound (I) is the following compound (I-1-1) to compound (I-1-27).
Is. Preferred compound (II) is compound (II-1-1)
To compound (II-8-4). Preferred compound (II
I) is compound (III-1) to compound (III-4). In these preferred compounds, R ¹ has ¹ carbon atom
Is alkyl having 10 to 10, alkoxy having 1 to 10 carbons or alkenyl having 2 to 10 carbons, and R ′ is 1 to 1 carbon.
It is alkyl having 10 carbons or alkoxymethyl having 2 to 10 carbons, and R is alkyl having 1 to 10 carbons. In these compounds, trans is preferable to cis for the configuration of 1,4-cyclohexylene.

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

The compounds that are components of the composition can be synthesized by known methods. Regarding the compound (I), for example, the compound (I-1) can be synthesized by a similar method described in JP-A-4-257535. Regarding compounds (II-1) and (II-4), for example, compounds (II-1-5) and (II-4-1) are described in
It can be synthesized by the method described in JP-A-251186. Compounds (II-2), (II-3) and (II-5)
For, for example, compounds (II-2-1), (II-3
-3) and (II-5-1) are described in JP-A-2-23362.
It can be synthesized by the method described in JP-A-6.

Regarding the compounds (II-6) to (II-8), for example, the compound (II-6-1) can be synthesized by the method described in 2000 Proceedings of the Liquid Crystal Society of Japan Symposium, 1C11. . Compounds (II-7) and (II-8
-1) is a collection of 2000 abstracts of the Japanese Liquid Crystal Society
It can be synthesized by the method described in 1C10. Regarding the compound (III), for example, the compound (III-1) can be synthesized by the method described in JP-A-2-237949. Other compounds include New Experimental Chemistry Course (Maruzen Co., Ltd.), Organic Syntheses (Organi)
c Syntheses, John Wiley & Sons, Inc.), Organic Reactions, John Wiley &
Sons, Inc.) and the like.

The composition of the present invention contains a first component and a second component. The composition may further contain a third component. The composition may further contain other compounds different from the first component, the second component and the third component. For example, other liquid crystal compounds can be added for the purpose of adjusting the characteristics. Additives may be added to improve the properties. For example, a chiral dopant is added for the purpose of inducing a helical structure of liquid crystal and giving a twist angle. G
A dichroic dye may be added for use in an H (Guest host) mode device. The composition is prepared by a known method. For example, the component compounds are mixed and heated to dissolve each other.

The composition of the present invention comprises PC, TN, IPS,
It can be used for devices having modes such as STN, OCB, ECB, and VA. This composition is suitable for a device having a small cell gap. This composition is particularly suitable for an AM device having a small cell gap. NCAP (nematic curv) prepared by microencapsulating this composition
PD (polymer dispersed) in which a three-dimensional network polymer is formed in an ilinear aligned phase) element or composition.
It can also be used as a device. An example of a PD element is PN (polymer ne
twork) element. These devices have the general characteristics required for the device.

[0041]

EXAMPLES The present invention will be described in detail below with reference to examples. The invention is not limited by these examples. The ratios of the components shown in Comparative Examples and Examples are% by weight.
The compounds in Comparative Examples and Examples are represented by symbols based on the definitions in Table 1 below. Finally, the characteristic values of the composition are shown.

By comparing the results of Comparative Examples 1 to 4 with the results of Examples 1 to 12, it is concluded as follows. The composition of the example had the general properties required for the composition, a nematic phase, especially high optical anisotropy, and a positive dielectric anisotropy. The liquid crystal display device containing this composition had the general characteristics required for the device. This composition was suitable for a device having a small cell gap, and particularly suitable for an AM device having a small cell gap.

[0043]

The characteristic values were measured according to the following methods. Phase transition temperature (T _NI ; ° C) of nematic-isotropic liquid: The sample was placed on a hot plate of a melting point measuring apparatus equipped with a polarization microscope and heated at a rate of 1 ° C / min. The temperature was measured when a part of the sample changed from a nematic phase to an isotropic liquid.

The nematic phase lower limit temperature _{(T C; ℃): 0} ℃ A sample having a nematic phase, -10 ℃, -20 ℃,
After storing in a freezer at -30 ° C or -40 ° C for 10 days, a liquid crystal phase was observed. For example, if the sample is -20
The nematic phase remained as it was at 0 ° C, and the lower limit temperature of the nematic phase was described as <-20 ° C when it changed to a crystal or smectic phase at -30 ° C.

Optical anisotropy (refractive index anisotropy; Δn; 25 ° C.)
The optical anisotropy was measured using an Abbe refractometer with light having a wavelength of 589 nm.

Viscosity (η; measured at 20 ° C .; mPa · s):
An E-type viscometer was used to measure the viscosity.

Threshold voltage (Vth; measured at 25 ° C .;
V): Normally white mode in which the distance (cell gap) between the two glass substrates is (0.5 / Δn) μm and the twist angle is 80 °.
The sample was put in the liquid crystal display element of. This element has a frequency of 3
A square wave of 2 Hz was applied. Increase the applied voltage,
The voltage value was measured when the transmittance of light passing through the device reached 90%.

Voltage holding ratio (VHR;%): According to the method for measuring the voltage holding ratio of a device having a liquid crystal composition and an alignment film, which is described in Japan Electronic Machinery Industry Association Standard EIAJ ED-2521A. The waveform of the applied voltage was observed with a cathode ray oscilloscope, and the area between the voltage curve and the horizontal axis was obtained in a unit cycle. The voltage holding ratio was calculated by comparing this value with the initial value. The device used for the measurement has a polyimide alignment film, and the cell gap is 6 μm. 25
The value measured at 0 ° C was described as VHR (25 ° C), and the value measured at 100 ° C was described as VHR (100 ° C).

Stability against ultraviolet rays: voltage holding ratio before irradiation of ultraviolet light (VHR; measured at 25 ° C.) and maximum temperature of nematic phase (T _NI ) and voltage holding ratio after irradiation [VHR (UV); The stability was determined by comparing the measurement at 25 ° C.] and the maximum temperature [T _NI (UV)] of the nematic phase. The liquid crystal cell used for the measurement has a polyimide alignment film, and the cell gap is 6 μm. Liquid crystal was injected into this cell and irradiated with light for 20 minutes. The light source is an ultra-high pressure mercury lamp USH-500D (manufactured by Ushio Inc.), and the distance between the cell and the light source is 20 cm.

Comparative Example 1 Of the compositions disclosed in JP 2001-3053 A, the composition of Example 3 having the largest optical anisotropy was selected. The components and properties of this composition are as follows. In this composition, the optical anisotropy is small. 2-BB (F, F) CF2OB (F, F) -F 12.0% 3-BB (F, F) CF2OB (F, F) -F 13.0% 3-HBB (F, F) CF2OB ( F) -F 5.0% 2-HBB (F, F) CF2OB (F, F) -F 10.0% 3-HBB (F, F) CF2OB (F, F) -F 10.0% 2- BB (F, F) CF2OBB (F) -F 5.0% 3-BB (F, F) CF2OBB (F) -F 5.0% 3-BB (F, F) CF2OB (F, F) B ( F) -F 3.0% 2-BBB (F, F) CF2OB (F, F) -F 3.0% 3-BBB (F, F) CF2OB (F, F) -F 4.0% 3- HHB (F, F) -F 8.0% 4-HHB (F, F) -F 5.0% 3-H2HB (F, F) -F 10.0% 3-H2BB (F, F) -F 7. _{% T NI = 78.7 ℃; T} C <-20 ℃; Δn = 0.13
9; η = 65.3 mPa · s; Vth = 1.00 V; V
HR (25 ° C) = 98.7%; VHR (100 ° C) = 9
5.2%; VHR (UV) = 97.3%; T _NI (U
V) = 78.0 ° C.

Comparative Example 2 Among the compositions disclosed in Japanese Patent Laid-Open No. 2001-3051, the composition of Example 5 having the largest optical anisotropy was selected. The components and properties of this composition are as follows. In this composition, the optical anisotropy is small. 3-B (F, F) CF2OBB (F) -F 7.0% 5-B (F, F) CF2OBB (F) -OCF3 5.0% 5-B (F, F) CF2OBB (F) -F 5.0% 3-B (F, F) CF2OB (F, F) B (F) -F 3.0% 3-HB (F) B (F, F) CF2OB (F, F) -F 5. 0% 2-HBB (F, F) CF2OB (F) -OCF3 5.0% 3-BB (F, F) CF2OBB (F) -F 5.0% 3-BB (F, F) CF2OB (F, F) B (F) -F 3.0% 2-HBB (F) -F 3.0% 3-HBB (F) -F 3.0% 5-HBB (F) -F 6.0% 3- HBB (F, F) -F 15.0% 5-HBB (F, F) -F 15.0% 3-H2BB (F, F) -F 6.0% 5-HBB (F) B-2 7 0.0% 5-HBB ( _{) B-3 7.0% T NI} = 99.4 ℃; T C <-20 ℃; η = 50.1m
Pa · s; Δn = 0.162; Vth = 1.34V; V
HR (25 ° C) = 98.7%; VHR (100 ° C) = 9
5.0%; VHR (UV) = 97.2%; T _NI (U
V) = 99.0 ° C.

Comparative Example 3 Among the compositions disclosed in JP 2001-123170 A, the composition of Example 6 having the largest optical anisotropy was selected. The components and properties of this composition are as follows. In this composition, the optical anisotropy is small. 3-BB (F, F) CF2OBB-3 5.0% 2-HBB (F) -F 7.5% 3-HBB (F) -F 7.5% 5-HBB (F) -F 15.0. % 3-HBB (F, F) -F 13.0% 5-HBB (F, F) -F 13.0% 3-HBB (F, F) CF2OB (F, F) -F 11.0% 5 -HBB (F, F) CF2OB (F, F) -F 11.0% 5-HBB (F) B-2 9.0% 5-HBB (F) B-3 8.0% T _NI = 133. 4 ° C .; T _C <−20 ° C .; η = 43.9
mPa · s; Δn = 0.170; Vth = 1.59V;
VHR (25 ° C) = 99.1%; VHR (100 ° C) =
96.3%; VHR (UV) = 97.4%; T _NI (U
V) = 133.0 ° C.

Comparative Example 4 A composition (Example 2) disclosed in JP-A-4-257535 was prepared. The components and properties of this composition are as follows. This composition has small optical anisotropy and low VHR (100 ° C.) and VHR (UV). ZLI-1565 90% 5-BB (2F, 5F) B-5 10% T NI = 85.3 ℃; T C <-30 ℃; Δn = 0.13
5; η = 20.5 mPa · s; Vth = 2.34V; V
HR (25 ° C) = 88.5%; VHR (100 ° C) = 6
2.3%; VHR (UV) = 83.3%; T _NI (U
V) = 85.0 ° C.

Example 1 First component 3-BB (2F, 5F) B 2% 5-BB (2F, 5F) B 15% 4-BBB (2F, 5F) B (2F) 2% 5-BBB (2F , 5F) B (2F) 3% 4-BBB (2F, 5F) B (F) 2% 5-BBB (2F, 5F) B (F) 3% 4-BB (F) B (2F, 5F) B 2% 5-BB (F) B (2F, 5F) B 3% 4-BB (2F) B (2F, 5F) B 2% 5-BB (2F) B (2F, 5F) B 3% Second component 3-BB (F, F) CF2OB (F, F) -F 13% 3-BB (F, F) CF2OB (F) -OCF3 2% 3-BB (F, F) CF2OB-OCF3 3% 3-HB (F, F) CF2OB (F, F) -F 2% 2-HBB (F) -F 7.5% 3-HBB (F) -F 7.5% 5-HBB (F) -F 15% 3-HBB (F, F) -F 13% T _N = 86.0 ° C; T _C <-20 ° C; Δn = 0.19.
2; η = 90.8 mPa · s; Vth = 1.25V; V
HR (25 ° C) = 99.1%; VHR (100 ° C) = 9
6.0%; VHR (UV) = 98.6%; T _NI (U
V) = 85.5 ° C.

Example 2 First component 3-BB (2F, 5F) B 2% 5-BB (2F, 5F) B 15% Second component 3-BB (F, F) CF2OB (F, F) -F 13% 3-HB (F, F) CF2OB (F) -F 2% 2-HBB (F) -F 7.5% 3-HBB (F) -F 7.5% 5-HBB (F) -F 15% 3-BBB (F, F) -CL 2% 3-BB (F, F) CF2OBB (F) -F 5% 5-BB (F, F) CF2OBB (F) -F 5% 3-BB ( F, F) CF2OBB-F 5% 5-BB (F, F) CF2OBB-F 5% 2-HHBB (F, F) -F 3% 3-HHBB (F, F) -F 4% 5-HHBB ( F, F) -F 5% 3 -HH2BB (F, F) -F 4% T NI = 101.3 ℃; T C <-20 ℃; Δn = 0.1
76; η = 64.7 mPa · s; Vth = 1.43 V;
VHR (25 ° C) = 99.2%; VHR (100 ° C) =
95.7%; VHR (UV) = 98.4%; T _NI (U
V) = 100.2 ° C.

Example 3 First component 5-BB (2F, 5F) B 6% 5-BB (2F, 5F) B (2F) 2% 5-BB (2F, 5F) B (F) 2% Second Ingredient 3-BB (F, F) CF2OB (F, F) -F 4% 3-HB (F, F) CF2OB-F 2% 2-HBEB (F, F) -F 3% 3-HBEB (F, F) -F 3% 5-HBEB (F, F) -F 3% 3-HB (F) EB-OCF3 3% 2-HBB (F) -F 7.5% 3-HBB (F) -F 7 .5% 5-HBB (F) -F 15% 3-BB (F) B (F, F) -F 5% 3-BB (F, F) CF2OBB (F) -F 5% 5-BB (F , F) CF2OBB (F) -F 5% 3-BB (F, F) CF2OBB-F 5% 5-BB (F, F) CF2OBB-F 5% 3-BB (F, F) CF2OB (F) -OCF3 3% 3-HB (F, F) CF2OBB-F 5% 3-HHBB (F, F) -F 3% 5-HHBB (F, F) -F 3% 3-HHB (F) _{B (F, F) -F 3} % T NI = 105.2 ℃; T C <-20 ℃; Δn = 0.1
75; η = 65.9 mPa · s; Vth = 1.35 V;
VHR (25 ° C) = 98.8%; VHR (100 ° C) =
95.2%; VHR (UV) = 96.3%; T _NI (U
V) = 104.8 ° C.

Example 4 First component 5-BB (2F, 5F) B 9% 5-BBB (2F, 5F) B (2F) 2% Second component 3-BB (F, F) CF2OB (F, F ) -F 13% 3-HB (F, F) CF2OB (F, F) -F 2% 2-HBB (F) -F 7.5% 3-HBB (F) -F 7.5% 5-HBB (F) -F 15% 3-HB (F, F) B (F) -F 4% 3-HB (F) B (F, F) -F 4% 3-BB (F, F) CF2OBB (F ) -F 7% 5-BB (F, F) CF2OBB (F) -F 8% 3-BB (F, F) CF2OBB-F 6% 5-BB (F, F) CF2OBB-F 7% 2-HHBB (F, F) -F 2% 3-HHBB (F, F) -F 2% 5-HHBB (F, F) -F 2% 3-HHB (F) B (F, F) -F 2% T _NI = _{95.7 ℃; T C <-20 ℃} ; Δn = 0.17
5; η = 67.1 mPa · s; Vth = 1.30V; V
HR (25 ° C) = 99.0%; VHR (100 ° C) = 9
5.9%; VHR (UV) = 97.2%; T _NI (U
V) = 96.0 ° C.

Example 5 First component 5-BB (2F, 5F) B 10% 5-BB (F, F) B 2% 5-BB (F) B (2F) 2% 7-B (F) B (2F) 2% 5-BBB (2F, 5F) B 2% 4-BBB (F, F) B 1.5% 5-BBB (F, F) B 1.5% 5-BBB (F, F) B (2F) 2% 4-BBB (F, F) B (F) 1.5% 5-BBB (F, F) B (F) 1.5% Second component 3-BB (F, F) CF2OB (F, F) -F 15% 2-HBB (F) -F 7.5% 3-HBB (F) -F 7.5% 5-HBB (F) -F 15% 3-H2BB (F)- F 4% 3-BB (F, F) CF2OBB (F) -F 4% 5-BB (F, F) CF2OBB (F) -F 5% 3-BB (F, F) CF2OBB-F 3% 2- HHBB (F, F) -F 2 3-HHBB (F, F) -F 3% 3-HNpr (F) B (F, F) -F 2% 3-HNp (F) -F 2% 3-HNpB (F, F) -F 2% 3-HNp (F) B (F, F) -F 2% T _NI = 89.6 ° C .; T _C <−20 ° C .; Δn = 0.17.
5; η = 80.3 mPa · s; Vth = 1.27 V; V
HR (25 ° C) = 99.1%; VHR (100 ° C) = 9
6.2%; VHR (UV) = 97.1%; T _NI (U
V) = 89.1 ° C.

Example 6 First component 5-BB (2F, 5F) B 15% Second component 3-BB (F, F) CF2OB (F, F) -F 20% 2-HBB (F) -F 5 % 3-HBB (F) -F 5% 5-HBB (F) -F 10% 3-HBB (F, F) -F 25% Third component 5-HBB (F) B-2 10% 5-HBB _{(F) B-3 10%} T NI = 98.8 ℃; T C <-20 ℃; Δn = 0.17
5; η = 57.6 mPa · s; Vth = 1.53 V; V
HR (25 ° C) = 99.3%; VHR (100 ° C) = 9
5.9%; VHR (UV) = 97.0%; T _NI (U
V) = 98.3 ° C.

Example 7 First component 5-BB (2F, 5F) B 15% Second component 3-BB (F, F) CF2OB (F, F) -F 20% 2-HBB (F) -F 5 % 3-HBB (F) -F 5% 5-HBB (F) -F 10% 3-HBB (F, F) -F 21% 3-HNprB (F, F) -F 2% 3-NpB (F , F) -F 2% third component 5-HBB (F) B- 2 10% 5-HBB (F) B-3 10% T NI = 97.2 ℃; T C <-20 ℃; Δn = 0 .17
5; η = 59.8 mPa · s; Vth = 1.48V; V
HR (25 ° C) = 98.9%; VHR (100 ° C) = 9
6.0%; VHR (UV) = 96.9%; T _NI (U
V) = 96.8 ° C.

Example 8 First component 5-BB (2F, 5F) B 10% 5-BBB (2F, 5F) B (2F) 2% 5-BBB (2F, 5F) B (F) 2% 5- BB (F) B (2F, 5F) B 2% 5-BB (2F) B (2F, 5F) B 2% Second component 3-BB (F, F) CF2OB (F, F) -F 13% 3 -BB (F, F) CF2OB (F) -OCF3 2% 3-BB (F, F) CF2OB-OCF3 3% 3-HB (F, F) CF2OB (F, F) -F 2% 2-HBB ( F) -F 7.5% 3-HBB (F) -F 7.5% 5-HBB (F) -F 15% 3-HBB (F, F) -F 13% 3-Npr (F, F) B (F, F) -F 2% 3-Np (F) B (F, F) -F 2% Third component 1O1-HBBH-5 2% 5-HBB (F) B-2 10% 5- _{BB (F) B-3 3} % T NI = 94.7 ℃; T C <-20 ℃; Δn = 0.17
8; η = 76.6 mPa · s; Vth = 1.34V; V
HR (25 ° C) = 98.9%; VHR (100 ° C) = 9
5.9%; VHR (UV) = 96.8%; T _NI (U
V) = 94.3 ° C.

Example 9 First component 5-BB (2F, 5F) B 10% Second component 3-BB (F, F) CF2OB (F, F) -F 15% 2-HBB (F) -F 6 % 3-HBB (F) -F 6% 5-HBB (F) -F 12% 3-HBB (F, F) -F 5% 3-BBB (F, F) -CL 2% 3-BB (F , F) CF2OBB (F) -F 5% 5-BB (F, F) CF2OBB (F) -F 5% 3-BB (F, F) CF2OBB-F 5% 5-BB (F, F) CF2OBB- F 5% 2-HHBB (F, F) -F 3% 3-HHBB (F, F) -F 4% 3-HH2BB (F, F) -F 4% 3-Npr (F) B (F, F ) -F 2% 3-NprB (F, F) -F 2% Third component 5-HBBH-3 2% 5-HBB (F) B-2 5% 5-HB (F) BH-2 2% T _NI = 105.6 ° C .; T _C <−20 ° C .; Δn = 0.1
82; η = 64.0 mPa · s; Vth = 1.46V;
VHR (25 ° C) = 99.1%; VHR (100 ° C) =
95.7%; VHR (UV) = 98.6%; T _NI (U
V) = 105.1 ° C.

Example 10 First component 5-BB (2F, 5F) B 8% 5-BB (F, F) B (2F) 2% 5-BB (F, F) B (F) 2% 7- B (F) B (2F, 5F) 2% 7-B (2F) B (2F, 5F) 2% 7-B (F, F) B 2% 5-BB (F, F) BB 2% 5- BB (F, F) B (2F) B 2% 5-BB (F, F) B (F) B 2% 5-BB (F) B (2F) B 2% 5-BBB (F) B (2F ) 2% 2nd component 3-BB (F, F) CF2OB (F, F) -F 20% 3-BB (F, F) CF2OB-F 5% 3-HB (F, F) CF2OB (F)- OCF3 5% 3-H2BB (F) -F 5% 3-HBB (F, F) -F 8% 3-H2BB (F, F) -F 5% 3-BB (F, F) CF2OBB-F 2% 3-HNpr (F) B (F, F)- 2% third component 5-HBB (F) B- 2 10% 5-HBB (F) B-3 10% T NI = 89.9 ℃; T C <-20 ℃; Δn = 0.17
8; η = 80.8 mPa · s; Vth = 1.25V; V
HR (25 ° C) = 98.5%; VHR (100 ° C) = 9
5.1%; VHR (UV) = 97.1%; T _NI (U
V) = 104.4 ° C.

Example 11 First component 5-BB (2F, 5F) B 10% 7-BB (2F, 5F) 2% 7-B (F, F) B (2F) 2% 7-B (F, F) B (F) 2% 5-BBB (F, F) B 2% 5-BBB (F, F) B (2F) 2% 5-BBB (F, F) B (F) 2% Second component 3-BB (F, F) CF2OB (F, F) -F 25% 3-HBB (F) -F 5% 5-HBB (F) -F 5% 3-HBB (F, F) -F 10% 3-H2BB (F, F) -F 5% 2-HHBB (F, F) -F 2% 3-HHBB (F, F) -F 2% 5-HHBB (F, F) -F 2% 3- HH2BB (F, F) -F 2 % third component 5-HBB (F) B- 2 10% 5-HBB (F) B-3 10% T NI = 96.4 ℃; T C <-20 ℃; Δn = 0.17
5; η = 74.2 mPa · s; Vth = 1.36V; V
HR (25 ° C) = 98.7%; VHR (100 ° C) = 9
5.3%; VHR (UV) = 97.2%; T _NI (U
V) = 96.0 ° C.

Example 12 First component 5-BB (2F, 5F) B 10% Second component 3-BB (F, F) CF2OB (F, F) -F 20% 2-HBB (F) -F 7 % 3-HBB (F) -F 7% 5-HBB (F) -F 14% 3-H2BB (F) -F 5% 3-HBB (F, F) -F 15% 2-HHBB (F, F ) -F 2% third component 5-HBB (F) B- 2 10% 5-HBB (F) B-3 10% T NI = 104.0 ℃; T C <-20 ℃; Δn = 0.1
76; η = 57.3 mPa · s; Vth = 1.60 V;
VHR (25 ° C) = 99.4%; VHR (100 ° C) =
96.0%; VHR (UV) = 97.0%; T _NI (U
V) = 103.6 ° C.

[0067]

The composition of the present invention has general properties required for the composition, a nematic phase, particularly large optical anisotropy, and positive dielectric anisotropy. The liquid crystal display device of the present invention containing this composition had the general characteristics required for the device. This composition was suitable for a device having a small cell gap, and particularly suitable for an AM device having a small cell gap.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09K 19/44 C09K 19/44 19/46 19/46 G02F 1/13 500 G02F 1/13 500

Claims (5)

[Claims] 1. A first component comprising at least one compound selected from the group of compounds represented by formula (I) and a group of compounds represented by formulas (II-1) to (II-8). A liquid crystal composition containing a second component consisting of at least one compound described above. In the formula (I), R ¹ is alkyl having 1 to 10 carbons,
Alkoxy having 1 to 10 carbons or alkenyl having 2 to 10 carbons; X ^{1 to} X ¹² are independently hydrogen or fluorine, at least two of X ^{1 to} X ¹² are fluorine, and one When 1,4-phenylene has two fluorines, the fluorine positions are the 2 and 5 positions or the 2 and 6 positions; and n is 0, 1 or 2. In formulas (II-1) to (II-8), R has 1 to 1 carbon atoms.
0 is alkyl; A is 1,4-phenylene or 1,4-cyclohexylene; X ¹ , X ² and X
³ is independently hydrogen or fluorine; Y ¹ is fluorine or —OCF ₃ and Y ² is fluorine or chlorine; and Z is a single bond or —C ₂ H ₄ —
And n is 0 or 1. 2. The liquid crystal composition according to claim 1, wherein the first component is 5 to 50% by weight and the second component is 30 to 95% by weight based on the total weight of the liquid crystal composition. 3. The liquid crystal composition according to claim 1, further comprising a third component composed of at least one compound selected from the group of compounds represented by formula (III). R'is alkyl having 1 to 10 carbons or 2 to 10 carbons
Is alkoxymethyl, R is alkyl having 1 to 10 carbons; A is 1,4-phenylene or 1,4-cyclohexylene; and X ¹ and X ² are independently hydrogen or fluorine. is there. 4. The liquid crystal composition according to claim 3, wherein the third component is 40% by weight or less based on the total weight of the liquid crystal composition. 5. A liquid crystal display device containing the liquid crystal composition according to claim 1.