TW201443202A - Liquid crystal composition and liquid crystal display element using same - Google Patents

Abstract

The present invention relates to a nematic liquid crystal composition useful as a liquid crystal display material, in which the dielectric anisotropy ([Delta][epsilon]) thereof has a negative value, and to a liquid crystal display element that uses the liquid crystal composition. This liquid crystal composition has a liquid crystal phase in a wide temperature range, low viscosity, satisfactory solubility at low temperature, and high resistivity or voltage retention rate, and is stable against heat or light. Therefore, through use of this liquid crystal composition a VA-type or PSVA-type liquid crystal display element can be provided at high yield that has excellent display quality and that is not prone to display defects such as image retention or drop marks. A liquid crystal display element that uses this liquid crystal composition achieves both fast response and low incidence of display defects, and is useful particularly as an active-matrix-driven liquid crystal display element, and can be applied as a liquid crystal display element such as a VA-mode or PSVA-mode liquid crystal display element.

Description

Liquid crystal composition and liquid crystal display element using same

The present invention relates to a liquid crystal composition and a liquid crystal display element which are useful as constituent members such as a liquid crystal display device.

The liquid crystal display element is used for various measuring machines, such as a timepiece and a calculator, a panel for a car, a word processor, an electronic notebook, a printer, a computer, a television, a clock, an advertisement display panel, and the like. Typical examples of the liquid crystal display method include TN (twisted nematic) type, STN (super twisted nematic) type, and TFT (thin film transistor) (vertical alignment). , vertical orientation type or IPS (In-Plane Switching) type. The liquid crystal composition used for the liquid crystal display elements is required to be stable to external factors such as moisture, air, heat, light, and the like, and the liquid crystal phase is displayed in a temperature range as wide as possible around the room temperature, and is low in viscosity. And the driving voltage is low. Further, in order to optimize the dielectric conductivity (Δε) or/and the refractive index anisotropy (Δn), which are optimal for each display element, the liquid crystal composition is composed of several to several tens of compounds. Composition.

A liquid crystal composition having a negative Δ ε is used in a vertical alignment type display, and is widely used for a liquid crystal TV or the like. On the other hand, in all driving methods, low voltage driving, high speed response, and wide operating temperature range are required. That is, Δε is required to be positive and the absolute value is large, the viscosity (η) is small, and the high nematic phase-isotropic liquid phase transition temperature (T _ni ) is required. Further, according to the setting of Δn and the cell gap (d), that is, Δn × d, the Δn of the liquid crystal composition is adjusted to an appropriate range by the cell gap. Further, when a liquid crystal display element is applied to a television or the like, high-speed responsiveness is emphasized, and therefore, a liquid crystal composition having a small γ ₁ is required. Conventionally, a compound having a dialkylbicyclohexane skeleton has been generally used in order to constitute a liquid crystal composition having a small γ ₁ (see Patent Document 1). However, although the bicyclohexane compound has a high effect of reducing γ ₁ , the tendency of a compound having a high vapor pressure and a short alkyl chain length is particularly remarkable. In addition, in the case where the T _{ni is} also low, the alkyl bicyclohexane compound is often a compound having a total of side chain lengths of 7 or more, and the compound having a short side chain length has not been sufficiently studied.

On the other hand, the use of the liquid crystal display element is expanding, and the method of use and the method of manufacturing can be greatly changed. For the purpose of matching, it is required to optimize characteristics other than the basic physical property values previously known. In other words, a liquid crystal display device using a liquid crystal composition has widely used a VA (Vertical Alignment) type or an IPS (In-Plane Switching) type, and the size of the ultra-large size display element of 50 or more has been put into practical use. used. With the increase in the size of the substrate, the method of injecting the liquid crystal composition into the substrate has been the mainstream of the injection method from the previous vacuum injection method to the ODF (One Drop Fill) method (refer to Patent Document 2). The problem that the dripping marks when the composition is dropped onto the substrate causes a decrease in display quality tends to be surfaced. Further, in order to generate a pretilt angle of a liquid crystal material in a liquid crystal display device and high-speed responsiveness, a PS (polymer stabilized) liquid crystal display element and a PSA (polymer sustained alignment) have been developed. A liquid crystal display element (refer to Patent Document 3), and this problem becomes a more serious problem. That is, the display elements are characterized in that a monomer is added to the liquid crystal composition to harden the monomer in the composition. The liquid crystal composition for active matrix is specifically used as a compound based on the necessity of maintaining a high voltage holding ratio, and the use of a compound having an ester bond in the compound is restricted. The monomer used in the PSA liquid crystal display device is mainly an acrylate type, and generally has an ester bond in the compound, and such a compound is generally not used as a liquid crystal compound for an active matrix (see Patent Document 3). Such foreign matter induces the occurrence of dripping marks, and the deterioration of the yield of the liquid crystal display element caused by poor display becomes a problem. Also, in the liquid crystal composition When an additive such as an antioxidant or a light absorber is added, the deterioration of the yield also becomes a problem.

Here, the drop mark is defined as a phenomenon in which the trace of the liquid crystal composition drops to white when the black display is performed.

Regarding the suppression of the dropping trace, there is disclosed a method of forming a polymer layer in a liquid crystal layer by polymerizing a polymerizable compound mixed in a liquid crystal composition, thereby suppressing dropping due to a relationship with the orientation control film. Trace (Patent Document 4). However, this method has a problem of displaying a residual image caused by a polymerizable compound added to a liquid crystal, and the effect of suppressing a dripping trace is also insufficient, and development of maintaining the basic characteristics of a liquid crystal display element and making it difficult to generate an afterimage or A liquid crystal display element in which traces are dropped. Further, in a vertical alignment type display which does not form a polymer layer in a liquid crystal layer by polymerization of a polymerizable compound, but performs a directional control using a general vertical alignment film, development of an afterimage is also difficult to produce. Or a liquid crystal display element with a trace of it.

[Patent Document 1] Japanese Patent Publication No. 2008-505235

[Patent Document 2] Japanese Laid-Open Patent Publication No. Hei 6-235925

[Patent Document 3] Japanese Laid-Open Patent Publication No. 2002-357830

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2006-58755

The object of the present invention is to provide a liquid crystal composition and a liquid crystal display element using the same, which is suitable for not stabilizing the mesa, the viscosity, the nematic phase upper limit temperature, and the low temperature nematic phase of the dielectric. the discharge amount of liquid crystal materials, γ ₁ and other characteristics of each display element and the display element of the afterimage characteristic deterioration hardly occurs during the manufacture of drop marks, ODF and stabilization step of the liquid crystal display element.

In order to solve the above problems, the present inventors have studied the composition of various liquid crystal compositions which are most suitable for producing a liquid crystal display element by a dropping method, and found that it is possible to suppress the liquid crystal display element by using a specific liquid crystal compound at a specific mixing ratio. The creation of the traces is completed, thereby completing the invention of the present invention.

The present invention provides a liquid crystal composition having a negative dielectric conductivity and a liquid crystal display element using the liquid crystal composition, the liquid crystal composition containing the following formula (i):

a compound represented by the formula (XII-1-5) or (XII-1-6):

Expressed as a compound.

The liquid crystal display device of the present invention is characterized in that it has excellent high-speed response and low generation of afterimages, and has a feature that the occurrence of dripping marks caused by the production thereof is small. Therefore, it is useful for display elements such as liquid crystal TVs and monitors.

1‧‧‧Polar plate

2‧‧‧Substrate

3‧‧‧Transparent electrode or transparent electrode with active components

4‧‧‧ Orientation film

5‧‧‧LCD

11‧‧‧ gate electrode

12‧‧‧Anodic Oxide Film

13‧‧‧ gate insulation

14‧‧‧Transparent electrode

15‧‧‧汲electrode

16‧‧‧Ohm contact layer

17‧‧‧Semiconductor layer

18‧‧‧Protective film

19a‧‧‧Source electrode 1

19b‧‧‧Source electrode 2

100‧‧‧Substrate

101‧‧‧Protective layer

Fig. 1 shows an example of the structure of a liquid crystal display element of the present invention.

Fig. 2 is a configuration example of an inverted staggered thin film transistor.

As mentioned above, the process of producing traces is not yet clear. However, it is very It can be related to the interaction of impurities in the liquid crystal compound with the alignment film, the chromatography phenomenon, and the like. The impurities in the liquid crystal compound are greatly affected by the manufacturing process of the compound, and the manufacturing method of the compound is not necessarily the same even if the number of carbon atoms in the side chain is different. That is, since the liquid crystal compound is produced by a precise manufacturing process, the cost thereof is high in the chemically treated product, and the industry is strongly seeking to improve the manufacturing efficiency. Therefore, in order to use a slightly cheaper raw material, it is also possible to use a material having a different amount of carbon atoms in the side chain, and it is more efficient when it is produced from a completely different kind of raw material. Therefore, the manufacturing process of the liquid crystal original is different depending on each original, and in most cases, even if the processes are the same, the raw materials are different, and as a result, various impurities are mixed in each of the originals. However, the drop marks may also be generated by a very small amount of impurities, and there is a limit in suppressing the generation of dripping marks only by purifying the original.

On the other hand, in the manufacturing method of a general-purpose liquid crystal original, after the manufacturing process is established, each original body has a tendency to be fixed. At the present time in the development of analytical techniques, it is not easy to fully ascertain what impurities are mixed in, but it is necessary to carry out the design of the composition before mixing the specified impurities in the respective originals. The inventors of the present invention have studied the relationship between the impurities of the liquid crystal precursor and the dropping traces, and as a result, it has been empirically found that impurities which are hard to cause dripping marks and impurities which are liable to cause dripping marks even in the composition are found. Therefore, in order to suppress the generation of dripping marks, it is important to use a specific compound in a specific mixing ratio, in particular, to find out the existence of a composition which is difficult to produce dripping marks. The preferred embodiments described below are based on the above findings.

The liquid crystal composition of the present invention contains the compound represented by the formula (i) as the first component, preferably 5 to 50% by mass, more preferably 10 to 45% by mass, and still more preferably 15 to 40% by mass. More preferably, it is contained in the range of 20 to 40% by mass, and more specifically, in the case where the response speed is important, it is preferably 25 to 50% by mass, and in the case where the driving voltage is more important, it is preferably 20%. Mass%~40% by mass.

The compound represented by the formula (XII-1-5) or (XII-1-6) is preferably used as the second component, preferably 2 to 30% by mass, more preferably 4 to 25% by mass, and still more preferably It is contained in an amount of 6 to 20% by mass, particularly preferably 8 to 20% by mass.

Furthermore, the liquid crystal composition of the present invention may contain one or two or more compounds represented by the formula (L) as other components.

(wherein R ^L1 and R ^L2 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more of -CH ₂ - which are not adjacent to the alkyl group may be independently substituted with -CH, respectively. =CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-, OL represents 0, 1, 2 or 3, and B ^L1 , B ^L2 and B ^L3 are independently selected from (a) 1,4- cyclohexylene (in the presence of a group -CH ₂ - or not adjacent two or more of the -CH ₂ - may be substituted with -O-) and (b) 1, 4-phenylene (one present in the group -CH= or two or more adjacent to -CH= may also be substituted with -N=)

In the group of the composition, the above-mentioned group (a) and the group (b) may be independently substituted by any one of a cyano group, a fluorine atom or a chlorine atom, and L ^L1 and L ^L2 each independently represent a single bond, -CH ₂ CH ₂ -, -(CH ₂ ) ₄ -, -OCH ₂ -, -CH ₂ O-, -COO-, -OCO-, -OCF ₂ -, -CF ₂ O-, -CH=NN= CH-, -CH=CH-, -CF=CF- or -C≡C-, when OL is 2 or 3 and L ^L2 has a plurality of cases, the same may be different, and the OL is 2 or 3, and when there are a plurality of B ^L3 , the same may be the same, except for the compound represented by the formula (i).

When R ^L1 and R ^{L2 are} in the case where the ring structure to which the bond is bonded is a phenyl group (aromatic), it is preferably a linear alkyl group having 1 to 5 carbon atoms and a linear carbon number of 1 to 1 ring. Alkoxy group of 4 (or more) and alkenyl group having 4 to 5 carbon atoms, wherein the ring structure of the bond is cyclohexane, pyran and In the case of a saturated ring structure such as an alkane, a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 (or more) carbon atoms, and a linear chain are preferable. The number of carbon atoms is 2 to 5 alkenyl groups.

When the compound represented by the formula (L) is required to have chemical stability of the liquid crystal composition, it is preferred that the compound does not have a chlorine atom in its molecule.

The lower limit of the dielectric conductivity (Δε) of the compound represented by the formula (L) is -3 in one embodiment, and -2.5 in another embodiment. In another embodiment, it is -2, and in still another embodiment, it is -1.5. Further, in still another embodiment, it is -1, and in still another embodiment, it is -0.5. On the other hand, the upper limit of the dielectric specificity (Δε) of the compound represented by the general formula (L) is 3 in one embodiment and 2.5 in another embodiment. In another embodiment, it is 2, and in still another embodiment, it is 1.5. Further, in still another embodiment, it is 1, and in still another embodiment, it is 0.5.

The type of the compound which can be combined is not particularly limited, and is appropriately used in combination according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Further, in another embodiment of the present invention, there are three types. Further, in another embodiment of the present invention, there are four types. Further, in another embodiment of the present invention, it is five or more.

In the liquid crystal composition of the present invention, the content of the compound represented by the formula (L) needs to be based on solubility at low temperature, transfer temperature, electrical reliability, birefringence, process suitability, dripping trace, afterimage, and intervening. The electric conductivity or the volatility is required to be appropriately adjusted.

The lower limit of the preferred content is, for example, 5% in another embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Further, in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 15%. Further, in another embodiment of the present invention, it is 20%.

Further, regarding the upper limit value of the preferred content, the liquid crystal composition of the present invention is The total amount of the substance is, for example, 35% in another embodiment of the present invention. Further, in another embodiment of the present invention, it is 30%. Further, in another embodiment of the present invention, it is 25%. Further, in another embodiment of the present invention, it is 20%. Further, in another embodiment of the present invention, it is 15%. Further, in another embodiment of the present invention, it is 10%.

The range of the preferable content is, for example, 5 to 25% based on the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 10 to 30%. Further, in another embodiment of the present invention, it is 15 to 35%. Further, in another embodiment of the present invention, it is 20 to 40%. Further, in another embodiment of the present invention, it is 25 to 45%.

In the case where it is necessary to keep the viscosity of the liquid crystal composition of the present invention low and the response speed is high, it is preferable that the lower limit value is high and the upper limit value is high. Further, in the case where it is necessary to maintain a liquid crystal composition having a high T _ni of the liquid crystal composition of the present invention and good temperature stability, it is preferable that the lower limit value is high and the upper limit value is high. Further, in order to increase the dielectric specificity in order to maintain a low driving voltage, it is preferable that the lower limit value is low and the upper limit value is low.

Further, the compound represented by the formula (L) is preferably a compound selected from the group consisting of compounds represented by the general formula (I) to the general formula (V).

(wherein R ⁹¹ to R ⁹⁰ each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, in the formula (I) , except for the compound represented by formula (i)).

In the case of containing a compound selected from the group consisting of the compounds represented by the general formulae (I) to (V), it preferably contains one to ten, more preferably one to five, and more preferably In the case of containing two or more kinds of compounds, the content is preferably from 5 to 40% by mass, more preferably from 8 to 35% by mass, even more preferably from 10 to 30% by mass.

Preferably, R ⁹¹ to R ^9a each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkoxy group having 2 to 10 carbon atoms, more preferably 1 carbon atom; The alkyl group having 5 to 5, the alkenyl group having 2 to 5 carbon atoms or the alkoxy group having 2 to 5 carbon atoms, and the alkenyl group are preferably the following formula (Alkenyl-1) to (Alkenyl-4).

(in the formula, set the right end to the ring structure)

In the case where the liquid crystal composition of the present invention contains a reactive monomer, it is preferably a structure represented by the formula (Alkenyl-2) and the formula (Alkenyl-4), and more preferably a formula (Alkenyl-2). The structure of the representation.

Further, R ⁹¹ and R ⁹² may be the same or different, and preferably represent different substituents.

Further, the compound represented by the formula (I) is preferably a compound selected from the group consisting of compounds represented by the formula (Ia).

(Wherein, R ¹³ and R ¹⁴ each independently represent an alkyl group of 1 to 5 carbon atoms, R ¹³ and R ¹⁴ uses carbon atoms except for the compound in combination with an alkyl group of 2 of 3).

The type of the compound which can be combined is not particularly limited, and it is combined according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. About use The type of the compound is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Further, in another embodiment of the present invention, it is three or more.

In the liquid crystal composition of the present invention, the content of the compound represented by the formula (Ia) needs to be based on solubility at low temperature, transfer temperature, electrical reliability, birefringence, process suitability, dripping trace, afterimage, and intervening. Electrical adjustments such as guidance require performance and appropriate adjustments. The lower limit of the content of the preferred content is, for example, 3% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 8%. Further, in another embodiment of the present invention, it is 15%. Further, in another embodiment of the present invention, it is 20%. Further, in another embodiment of the present invention, it is 25%. Further, in another embodiment of the present invention, it is 30%.

Further, the upper limit of the preferable content is 40% with respect to the total amount of the liquid crystal composition of the present invention, for example, in another embodiment of the present invention. Further, in another embodiment of the present invention, it is 30%. Further, in another embodiment of the present invention, it is 20%. Further, in another embodiment of the present invention, it is 15%.

The range of the preferable content is, for example, 3 to 15% based on the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 5 to 20%. Further, in another embodiment of the present invention, it is 10 to 30%. Further, in another embodiment of the present invention, it is 15 to 40%.

The liquid crystal composition of the present invention must have a compound represented by the formula (i). When used in combination with the compound represented by the formula (Ia), the total amount thereof is preferably from 25 to 60% by mass, more preferably from 25 to 25. 55 mass%, more preferably 30 to 55 mass%, and still more preferably 30% to 50 mass%.

More specifically, the compound represented by the formula (I-a) is preferably a compound described below.

Preferred are compounds represented by the formula (Ia-1) and the formula (Ia-2). In order to produce a liquid crystal display element having a high T _ni and stable display at a high temperature, the content of the compound represented by the formula (Ia-1) and the formula (Ia-2) is preferably slightly increased.

Further, the compound represented by the formula (I) is preferably a compound selected from the group consisting of compounds represented by the formula (Ib).

(wherein R ¹⁸ each independently represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms).

The type of the compound which can be combined is not particularly limited, and it is combined according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Further, in another embodiment of the present invention, it is three or more.

In the liquid crystal composition of the present invention, the content of the compound represented by the formula (Ib) needs to be based on solubility at low temperature, transfer temperature, electrical reliability, birefringence, process suitability, dripping trace, afterimage, and intervening. Electrical adjustments such as guidance require performance and appropriate adjustments. The lower limit of the content of the preferred content is, for example, 2% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 3%. Further, in another embodiment of the present invention, it is 5%. Further, in another embodiment of the present invention, it is 8%. Further, in another embodiment of the present invention, it is 11%. Further, in another embodiment of the present invention, it is 15%. Further, in another embodiment of the present invention, it is 20%.

Further, regarding the upper limit of the preferred content, the liquid crystal composition of the present invention is The total amount of the substance is, for example, 40% in another embodiment of the present invention. Further, in another embodiment of the present invention, it is 35%. Further, in another embodiment of the present invention, it is 30%. Further, in another embodiment of the present invention, it is 25%. Further, in another embodiment of the present invention, it is 20%. Further, in another embodiment of the present invention, it is 15%.

The range of the preferable content is, for example, 2 to 15% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 4 to 15%. Further, in another embodiment of the present invention, it is 8 to 15%. Further, in another embodiment of the present invention, it is 11 to 20%. Further, in another embodiment of the present invention, it is 15 to 25%. Further, in another embodiment of the present invention, it is 20 to 30%. Further, in another embodiment of the present invention, it is 25 to 35%. Further, in another embodiment of the present invention, it is 30 to 40%.

More specifically, the compound represented by the formula (I-b) is preferably a compound described below.

A compound represented by the formula (I-b-2) or the formula (I-b-3) is preferred, and a compound represented by the formula (I-b-3) is particularly preferred.

Further, the compound represented by the formula (I) is preferably a compound selected from the group consisting of compounds represented by the formula (Ic).

(wherein R ¹³ represents an alkyl group having 1 to 5 carbon atoms, and R ¹⁵ represents an alkoxy group having 1 to 4 carbon atoms).

The type of the compound which can be combined is not particularly limited, and it is combined according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Further, in another embodiment of the present invention, it is three or more.

In the liquid crystal composition of the present invention, the content of the compound represented by the formula (Ic) needs to be based on solubility at low temperature, transfer temperature, electrical reliability, birefringence, process suitability, dripping trace, afterimage, and intervening. Electrical adjustments such as guidance require performance and appropriate adjustments. The lower limit of the content of the preferred content is, for example, 2% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 4%. Further, in another embodiment of the present invention, it is 6%. Further, in another embodiment of the present invention, it is 10%.

Further, the upper limit of the preferable content is, for example, 25% in the other embodiment of the present invention, and further 20% in the other embodiment of the present invention. Further, in another embodiment of the present invention, it is 15%.

The range of the preferable content is, for example, 2 to 15% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 4 to 20%. Further, in another embodiment of the present invention, it is 6 to 25%.

When the solubility in low temperature is emphasized, the effect is high if the content is set to be large, and the effect is high when the content is set to be small when the response speed is emphasized. Further, in the case of improving the characteristics of dripping marks or afterimages, it is preferred to set the range of the content therebetween.

More specifically, the compound represented by the formula (I-c) is preferably a compound described below.

Preferred are compounds represented by the formula (I-c-1), the formula (I-c-2) or the formula (I-c-3).

The liquid crystal composition of the present invention may further contain a compound represented by the formula (I-d-1) having a structure similar to the compound represented by the formula (I).

It is preferred to adjust the content of the compound represented by the formula (Id-1) according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence, with respect to the total amount of the liquid crystal composition of the present invention. It is preferable to contain 5% by mass or more and 32% by mass or less of the compound, more preferably 8% by mass or more and 32% by mass or less, more preferably 12% by mass or more and 32% by mass or less, and particularly preferably 15% by mass or less. % or more and 32% by mass or less.

Further, the compound represented by the formula (I) is preferably a compound selected from the group consisting of compounds represented by the formula (Ie).

(wherein R ¹⁶ and R ¹⁷ each independently represent an alkenyl group having 2 to 5 carbon atoms).

The type of the compound which can be combined is not particularly limited, and it is preferably one to three or more kinds depending on the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. Regarding the content of the compound represented by the formula (I-e), it depends on the solubility at low temperature and turns The required performance of the liquid crystal composition of the present invention is preferably 5% by mass or more based on the total amount of the liquid crystal composition of the present invention, such as the temperature, the electrical reliability, the birefringence, the process suitability, the dripping trace, the afterimage, and the dielectric properties. It is more preferably 10% by mass or more, still more preferably 15% by mass or more, and still more preferably 20% by mass or more. Further, the ratio which can be most contained is preferably 40% by mass or less, more preferably 35% by mass or less, and still more preferably 30% by mass or less.

The range of the preferable content is preferably 5% by mass or more and 25% by mass or less, more preferably 10% by mass or more and 30% by mass or less, and still more preferably 15% by mass based on the total amount of the liquid crystal composition of the present invention. % or more and 35% by mass or less, more preferably 20% by mass or more and 40% by mass or less.

Further, the compound represented by the formula (Ie) is preferably a compound selected from the group consisting of the compounds represented by the formula (Ie-1) to the formula (Ie-10), preferably the formula (Ie-2), and the formula (Ie-). 4) A compound represented by the formula (Ie-7).

Further, the compound represented by the formula (II) is preferably a compound selected from the group consisting of compounds represented by the formula (II-a).

(wherein R ¹¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and R ¹² represents an alkyl group having 1 to 5 carbon atoms; , an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

The type of the compound which can be combined is not particularly limited, and it is combined according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types.

In the liquid crystal composition of the present invention, the content of the compound represented by the formula (II-a) needs to be based on solubility at low temperature, transfer temperature, electrical reliability, birefringence, process suitability, dripping trace, afterimage The dielectric guidance and other requirements require appropriate adjustments. The lower limit of the content of the preferred content is, for example, 1% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 4%. Further, in another embodiment of the present invention, it is 7%. Further, in another embodiment of the present invention, it is 12%. Further, in another embodiment of the present invention, it is 15%. Further, in another embodiment of the present invention, it is 20%.

Further, the upper limit of the preferable content is 40% with respect to the total amount of the liquid crystal composition of the present invention, for example, in another embodiment of the present invention. Further, in another embodiment of the present invention, it is 35%. Further, in another embodiment of the present invention, it is 30%. Further, in another embodiment of the present invention, it is 20%. Further, in another embodiment of the present invention, it is 15%. Further, in another embodiment of the present invention, it is 10%.

The range of the preferable content is, for example, 3 to 8% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or another embodiment of the present invention The middle is 5~13%. Further, in another embodiment of the present invention, it is 7 to 18%. Further, in another embodiment of the present invention, it is 11 to 20%. Further, in another embodiment of the present invention, it is 13 to 25%. Further, in another embodiment of the present invention, it is 15 to 30%.

When the solubility in low temperature is emphasized, if the content is set to be large, the effect is high. On the other hand, when the response speed is emphasized, if the content is set to be small, the effect is high. Further, in the case of improving the characteristics of dripping marks or afterimages, it is preferred to set the range of the content therebetween.

More specifically, the compound represented by the formula (II-a) is preferably a compound described below.

More preferably, it is a compound represented by the formula (II-a-1), the formula (II-a-2), the formula (II-a-3) or the formula (II-a-6).

Further, the liquid crystal composition of the present invention may further contain a compound selected from the group consisting of compounds represented by the formula (II-b) having a structure similar to the compound represented by the formula (II).

(wherein R ¹¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and R ¹² represents an alkyl group having 1 to 5 carbon atoms; , an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

The total amount of the compound represented by the formula (II-b) is preferably 1% by mass or more and 6% by mass or less, more preferably 3% by mass or more and 8% by mass or less, more preferably the total amount of the liquid crystal composition of the present invention. It is 6 mass% or more and 15 mass% or less, more preferably 8 mass% or more and 20 mass% or less, more preferably 10 mass% or more and 25 mass% or less.

Further, the compound represented by the formula (II-b) is preferably a compound represented by the formula (II-b-1).

Further, the compound represented by the formula (III) is preferably a compound selected from the group consisting of compounds represented by the formula (III-a).

(wherein R ¹¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and R ¹² represents an alkyl group having 1 to 5 carbon atoms; , an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

The type of the compound which can be combined is not particularly limited, and it is combined according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. About use The type of the compound is, for example, one embodiment of the present invention. Or in another embodiment of this invention, they are two or more types.

In the liquid crystal composition of the present invention, the content of the compound represented by the formula (III-a) needs to be based on solubility at low temperature, transfer temperature, electrical reliability, birefringence, process suitability, dripping trace, afterimage The dielectric guidance and other requirements require appropriate adjustments. The lower limit of the content of the preferred content is, for example, 3% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 5%. Further, in another embodiment of the present invention, it is 8%. Further, in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 12%. Further, in another embodiment of the present invention, it is 15%. Further, in another embodiment of the present invention, it is 20%.

Further, the upper limit of the preferable content is, for example, 35% in the other embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Further, in another embodiment of the present invention, it is 30%.

The range of the preferable content is, for example, 3 to 15% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 5 to 15%. Further, in another embodiment of the present invention, it is 12 to 25%. Further, in another embodiment of the present invention, it is 15 to 30%. Further, in another embodiment of the present invention, it is 20 to 35%.

When the high birefringence is obtained, if the content is set to be large, the effect is high. On the other hand, when the high T _ni is emphasized, if the content is set to be small, the effect is high. Further, in the case of improving the characteristics of dripping marks or afterimages, it is preferred to set the range of the content therebetween.

More specifically, the compound represented by the formula (III-a) is preferably a compound described below.

Preferred are compounds represented by the formula (III-a-2), the formula (III-a-3) or the formula (III-a-4).

Further, it may contain a compound selected from the group consisting of compounds represented by the formula (III-b) having a structure similar to the compound represented by the formula (III).

(wherein R ¹¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and R ¹² represents an alkyl group having 1 to 5 carbon atoms; An alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and X ¹¹ and X ¹² each independently represent a fluorine atom or a hydrogen atom, and any of X ¹¹ or X ¹² is a fluorine atom) .

The total amount of the compound represented by the formula (III-b) relative to the liquid crystal composition of the present invention is preferably 2% by mass or more, more preferably 4% by mass, still more preferably 6% by mass or more, still more preferably 9% by mass. The above is more preferably 12% by mass or more.

The range of the preferable content is preferably 2% by mass or more and 15% by mass or less, more preferably 5% by mass or more and 18% by mass or less, and even more preferably 9% by mass based on the total amount of the liquid crystal composition of the present invention. % or more and 25% by mass or less.

Further, the compound represented by the formula (III-b) is preferably a compound represented by the formula (III-b-1).

Further, the compound represented by the formula (IV) is preferably a compound selected from the group of compounds represented by the formula (IV-a), for example.

(R ²⁵ represents an alkyl group having 1 to 5 carbon atoms, and R ²⁴ represents an alkyl group having 1 to 5 carbon atoms).

The type of the compound which can be combined is not particularly limited, and it is combined according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one of the embodiments of the present invention. Or in another embodiment of this invention, they are two or more types.

In the liquid crystal composition of the present invention, the content of the compound represented by the formula (IV-a) needs to be based on solubility at low temperature, transfer temperature, electrical reliability, birefringence, process suitability, dripping trace, afterimage The dielectric guidance and other requirements require appropriate adjustments. The lower limit of the content of the preferred content is, for example, 3% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 5%. Further, in another embodiment of the present invention, it is 7%. Further, in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 14%.

Further, the upper limit of the preferable content is, for example, 20% in the other embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Further, in another embodiment of the present invention, it is 15%. Further, in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 5%.

The range of the preferable content is, for example, 3 to 15% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 5 to 15%. Further, in another embodiment of the present invention, it is 7 to 15%. Further, in another embodiment of the present invention, it is 10 to 20%.

More specifically, the compound represented by the formula (IV-a) is preferably a compound described below.

Preferred is a compound represented by the formula (IV-a-2).

Further, the compound represented by the formula (IV) is preferably a compound selected from the group of compounds represented by the formula (IV-b), for example.

(R ²⁵ represents an alkyl group having 1 to 5 carbon atoms, and R ²⁶ represents an alkoxy group having 1 to 4 carbon atoms).

The type of the compound which can be combined is not particularly limited, and it is preferably one to three kinds of these compounds depending on the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence.

The content of the compound represented by the formula (IV-b) is preferably adjusted according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence, and is preferably 1% by mass or more. It is 4% by mass or more, and more preferably 8% by mass or more. Further, the ratio which can be most contained is preferably 15% by mass or less, more preferably 10% by mass or less, and still more preferably 8% by mass or less.

The range of the preferable content is preferably 1% by mass or more and 10% by mass or less, more preferably 4% by mass or more and 12% by mass or less, still more preferably 8% by mass or more and 15% by mass or less.

Further, the compound represented by the formula (IV-b) is also preferably a compound represented by the formula (IV-b-1) to the formula (IV-b-4), and among them, the formula (IV-b-3) is preferred. Expressed as a compound.

Further, the compound represented by the formula (IV) may also be a compound selected from the group of compounds represented by the formula (IV-c), for example.

(R ²³ represents an alkenyl group having 2 to 5 carbon atoms, and R ²⁴ represents an alkyl group having 1 to 5 carbon atoms).

The type of the compound which can be combined is not particularly limited, and it is combined according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of this invention, they are two or more types.

In the liquid crystal composition of the present invention, the content of the compound represented by the formula (IV-c) needs to be based on solubility at low temperature, transfer temperature, electrical reliability, birefringence, process suitability, dripping trace, afterimage The dielectric guidance and other requirements require appropriate adjustments. The lower limit of the content of the preferred content is, for example, 3% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 5%. Further, in another embodiment of the present invention, it is 5%. Further, in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 14%. Further, in another embodiment of the present invention, it is 16%.

Further, the upper limit of the preferable content is, for example, 20% in the other embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Further, in another embodiment of the present invention, it is 15%. Further, in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 5%.

The range of the preferable content is, for example, 3 to 12% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or another embodiment of the present invention The middle is 5~12%. Further, in another embodiment of the present invention, it is 7 to 15%. Further, in another embodiment of the present invention, it is 10 to 20%.

Further, the compound represented by the formula (IV-c) is preferably a compound represented by the formula (IV-c-1) to the formula (IV-c-3), for example.

The compound represented by the formula (IV-c-1) may contain a compound represented by the formula (IV-c-2), and may have a compound represented by the formula (IV-c-2) depending on the required properties such as solubility at a low temperature, transfer temperature, electrical reliability, and birefringence. It may also contain both the compound represented by the formula (IV-c-1) and the compound represented by the formula (IV-c-2), and may also contain all the formulae (IV-c-1) to (IV-c-3). ) the compound indicated. The content of the compound represented by the formula (IV-c-1) or the formula (IV-c-2) is preferably 3% by mass, and more preferably 5% by mass or more based on the total amount of the liquid crystal composition of the present invention. More preferably, it is 7% by mass or more, more preferably 9% by mass or more, and still more preferably 11% by mass or more. Further, the ratio which can be most contained is preferably 20% by mass or less, more preferably 15% by mass or less, and still more preferably 13% by mass or less.

Further, the range of the preferable content is preferably 3% by mass or more and 15% by mass or less, more preferably 5% by mass or more and 15% by mass or less, still more preferably 7% by mass or more and 15% by mass or less, and still more preferably It is 9% by mass or more and 18% by mass or less.

Further, the content of the compound represented by the formula (IV-c-2) is preferably 3% by mass, more preferably 5% by mass or more, and still more preferably 8% by mass based on the total amount of the liquid crystal composition of the present invention. More than %, and more preferably 10% by mass or more. Further, the ratio which can be most contained is preferably 20% by mass or less, more preferably 15% by mass or less, and still more preferably 12% by mass or less.

In the case where both the compound represented by the formula (IV-c-1) and the compound represented by the formula (IV-c-2) are contained, the total of the compounds of the two is relative to the total amount of the liquid crystal composition of the present invention. It is preferably 8% by mass or more, and more preferably 13% by mass or more. Further, the ratio which can be most contained is preferably 25% by mass or less, more preferably 20% by mass or less, still more preferably 15% by mass or less.

Further, the range of the preferable content is preferably 5% by mass or more and 20% by mass or less, more preferably 8% by mass or more and 18% by mass or less, and still more preferably 10% by mass or more and 18% by mass or less.

Further, the compound represented by the formula (V) is preferably a compound selected from the group consisting of compounds represented by the formula (Va).

(R ³¹ represents an alkyl group of 1 to 5 carbon atoms, R ³² represents an alkyl carbon atoms, or 1 to 5 carbon atoms of the alkoxy group having 1 to 4).

More specifically, the compound represented by the formula (V-a) is preferably a compound described below.

Further, the compound represented by the formula (V) is preferably a compound selected from the group consisting of compounds represented by the formula (Vb).

(R ³³ represents an alkenyl group having 2 to 5 carbon atoms, and R ³² each independently represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

It is preferably based on solubility at low temperature, transfer temperature, electrical reliability, and bi-fold The content is adjusted in accordance with the required properties such as the rate of radiation, and is preferably 4% by mass or more, more preferably 6% by mass or more, and still more preferably 10% by mass or more. Further, the ratio which can be most contained is preferably 20% by mass or less, more preferably 15% by mass or less, and still more preferably 10% by mass or less.

Further, the preferred range of the content is preferably 4% by mass or more and 13% by mass or less, more preferably 6% by mass or more and 13% by mass or less, and still more preferably 8% by mass or more and 13% by mass or less.

The compound represented by the formula (V-b) is preferably a compound represented by the formula (V-b-1) or the formula (V-b-2), for example.

Further, the compound represented by the formula (V) is preferably a compound selected from the group consisting of compounds represented by the formula (Vc).

(R ³¹ represents an alkyl group having 1 to 5 carbon atoms, and R ³⁴ represents an alkoxy group having 1 to 4 carbon atoms).

The content of the compound represented by the formula (Vc) is preferably adjusted according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence, and is preferably 4% by mass or more, more preferably 6 The mass% or more is more preferably 10% by mass or more. Further, the ratio which can be most contained is preferably 18% by mass or less, more preferably 13% by mass or less, and still more preferably 8% by mass or less.

Further, the preferred range of the content is preferably 4% by mass or more and 10% by mass or less, more preferably 6% by mass or more and 10% by mass or less.

Further, the compound represented by the formula (V-c) is preferably a compound selected from the group consisting of compounds represented by the formula (V-c-1) to the formula (V-c-3), and more preferably a compound represented by the formula (V-c-3).

Further, the compound represented by the formula (L) is preferably a compound selected from the group of compounds represented by the formula (VI), for example.

(R ²¹ and R ²² each independently represent an alkenyl group having 2 to 5 carbon atoms or an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

The content of the compound represented by the formula (VI) is preferably adjusted according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence, and is preferably 4% by mass or more, and more preferably 8 The mass% or more is more preferably 12% by mass or more. Further, the ratio which can be most contained is preferably 18% by mass or less, more preferably 12% by mass or less, and still more preferably 8% by mass or less.

Further, the preferred range of the content is preferably 4% by mass or more and 14% by mass or less, more preferably 8% by mass or more and 14% by mass or less.

Further, the compound represented by the formula (VI) is preferably a compound represented by the formula (VI-1) and the formula (VI-2), for example.

The content of the compound represented by the formula (VI) is preferably adjusted according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence, and is preferably 4% by mass or more, and more preferably 8 The mass% or more is more preferably 12% by mass or more. Further, the ratio which can be most contained is preferably 18% by mass or less, and more preferably 14% by mass or less.

Further, the preferred range of the content is preferably 4% by mass or more and 14% by mass or less, more preferably 8% by mass or more and 14% by mass or less.

Further, the compound represented by the formula (L) may also be a compound selected from the group of compounds represented by the formula (VII), for example.

(R ²¹ and R ²² each independently represent an alkenyl group having 2 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

These compounds may be contained alone or in combination of two or more kinds, and it is preferred to appropriately combine them according to the required properties. The type of the compound which can be combined is not particularly limited, and it is preferably one or two kinds of these compounds, depending on the solubility at low temperature, the transfer temperature, the electrical reliability, and the birefringence. Jiawei contains 1 to 3 species.

The content of the compound represented by the formula (VII) is preferably 1% by mass or more, more preferably 2% by mass or more, still more preferably 3% by mass or more, and more preferably the total amount of the liquid crystal composition of the present invention. It is 4% by mass or more, and particularly preferably 5% by mass or more. Further, the ratio which can be most contained is preferably 10% by mass or less, and more preferably 8% by mass or less.

Further, the preferred range of the content is preferably 1% by mass or more and 7% by mass or less, more preferably 2% by mass or more and 7% by mass or less.

Further, the compound represented by the formula (VH) is preferably a compound represented by the formula (VII-1) to the formula (VII-5), and more preferably a formula (VII-2) or/and a formula (VII-5). Compound.

Further, the compound represented by the formula (L) is also preferably a compound selected from the group represented by the formula (VIII).

(wherein R ⁵¹ and R ⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and A ⁵¹ and A ⁵² respectively Independently represents 1,4-cyclohexylene or 1,4-phenylene, Q ⁵ represents a single bond or -COO-, and X ⁵¹ and X ⁵² independently represent a fluorine atom or a hydrogen atom; X ⁵¹ and X ⁵² do not Will be a fluorine atom at the same time).

The type of the compound which can be combined is not particularly limited, and it is combined according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Further, in another embodiment of the present invention, there are three types. Further, in another embodiment of the present invention, there are four types.

The lower limit of the content of the preferred content is, for example, 2% in one embodiment with respect to the total amount of the liquid crystal composition of the present invention. Further, in another embodiment of the present invention, it is 4%. Further, in another embodiment of the present invention, it is 7%. Further, in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 12%. Further, in another embodiment of the present invention, it is 15%.

Further, as a preferable upper limit of the content, for example, in one embodiment of the present invention, it is 20% in another embodiment of the present invention. Furthermore, in another embodiment of the present invention, 15%. Further, in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 5%. Further, in another embodiment of the present invention, it is 4%.

The range of the preferable content is, for example, 2 to 15% in one embodiment with respect to the total amount of the liquid crystal composition of the present invention. Further, in another embodiment of the present invention, it is 4 to 12%. Further, in another embodiment of the present invention, it is 6 to 12%.

Further, the compound represented by the formula (VIII) is preferably a compound represented by the formula (VIII-a).

(wherein R ⁵¹ and R ⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

It is preferable to contain 1% by mass or more of the compound represented by the formula (VIII-a), more preferably 2% by mass or more, and still more preferably 3% by mass or more, based on the total amount of the liquid crystal composition of the present invention. The content is preferably 4% by mass or more. Further, the ratio which can be most contained is preferably 15% by mass or less, more preferably 10% by mass or less, and still more preferably 8% by mass or less.

Furthermore, the range of the preferable content is preferably 1% by mass or more and 15% by mass or less, more preferably 2% by mass or more and 10% by mass or less, based on the total amount of the liquid crystal composition of the present invention. The content is preferably 3% by mass or more and 8% by mass or less, and more preferably 4% by mass or more and 8% by mass or less.

Further, the compound represented by the formula (VIII-a) is preferably a compound represented by the formula (VIII-a-1) to the formula (VIII-a-4), preferably a compound represented by the formula (VIII-a-2). .

Further, the compound represented by the formula (VIII) may also be a compound represented by the formula (VIII-b).

(wherein R ⁵¹ and R ⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

The type of the compound which can be combined is not particularly limited, and it is combined according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Further, in another embodiment of the present invention, it is three or more.

It is preferable to contain 2% by mass or more of the compound represented by the formula (VIII-b), more preferably 4% by mass or more, and still more preferably 7% by mass or more, based on the total amount of the liquid crystal composition of the present invention. The content is preferably 8% by mass or more. Further, the ratio which can be most contained is preferably 15% by mass or less, more preferably 13% by mass or less, and still more preferably 11% by mass or less.

The range of the preferable content is preferably 2% by mass or more and 15% by mass or less, more preferably 4% by mass or more and 15% by mass or less, and still more preferably 7% by mass or more and 13% by mass or less.

Further, the compound represented by the formula (VIII-b) is preferably a compound represented by the formula (VIII-b-1) to the formula (VIII-b-3).

Further, the compound represented by the formula (VIII) is preferably a compound represented by the formula (VIII-c).

(wherein R ⁵¹ and R ⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and X ⁵¹ and X ⁵² respectively The fluorine atom or the hydrogen atom is independently represented; at least one of X ⁵¹ and X ⁵² is a fluorine atom, and both of them are fluorine atoms at the same time).

Further, the compound represented by the formula (VIII-c) is preferably a compound represented by the formula (VIII-c-1).

(wherein R ⁵¹ and R ⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

It is preferable to contain 1% by mass or more of the compound represented by the formula (VIII-c-1), more preferably 2% by mass or more, and still more preferably 3% by mass or more, based on the total amount of the liquid crystal composition of the present invention. More preferably, it is contained in an amount of 4% by mass or more. Further, the ratio which can be most contained is preferably 10% by mass or less, and more preferably 8% by mass or less.

Further, the range of the preferable content is preferably 1% by mass or more and 10% by mass or less, more preferably 2% by mass or more and 8% by mass or less, and still more preferably 3% by mass or more and 8% by mass or less. .

Further, the compound represented by the formula (VIII-c-1) is preferably a compound represented by the formula (VIII-c-1-1) to the formula (VIII-c-1-3), preferably a formula (VII-c). -1-1) A compound represented.

Further, the compound represented by the formula (VIII-c) is preferably a compound represented by the formula (VIII-c-2).

(wherein R ⁵¹ and R ⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

It is preferable to contain 1% by mass or more of the compound represented by the formula (VIII-c-2), more preferably 2% by mass or more, and still more preferably 3% by mass or more, based on the total amount of the liquid crystal composition of the present invention. More preferably, it is contained in an amount of 4% by mass or more. Further, the ratio which can be most contained is preferably 10% by mass or less, and more preferably 8% by mass or less.

Further, the range of the preferable content is preferably 1% by mass or more and 10% by mass or less, more preferably 2% by mass or more and 8% by mass or less, and still more preferably 3% by mass or more and 8% by mass or less. .

Further, the compound represented by the formula (VIII-c-2) is a compound represented by the formula (VIII-c-2-1) to the formula (VIII-c-2-3). A compound represented by the formula (VIII-c-2-1) is preferred.

Further, the compound represented by the formula (VIII) is preferably a compound represented by the formula (VIII-d).

(wherein R ⁵¹ and R ⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and X ⁵¹ and X ⁵² respectively Independently speaking, a fluorine atom or a hydrogen atom is not simultaneously a fluorine atom.

The type of the compound which can be combined is not particularly limited, and it is combined according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of this invention, they are two or more types.

The lower limit of the content of the preferred content is, for example, 2% in one embodiment with respect to the total amount of the liquid crystal composition of the present invention. Further, in another embodiment of the present invention, it is 4%. Further, in another embodiment of the present invention, it is 7%. Further, in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 12%.

Further, as a preferable content upper limit, for example, in one embodiment of the present invention, it is 15% in another embodiment of the present invention. Further, in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 5%. Further, in another embodiment of the present invention, it is 4%.

Further, the range of the preferable content is, for example, 2 to 10% in one embodiment with respect to the total amount of the liquid crystal composition of the present invention. Further, in another embodiment of the present invention, it is 4% to 10%.

In the case where the liquid crystal composition of the present invention is expected to have a high T _ni embodiment, it is preferred to increase the content of the compound represented by the formula (VIII-d), and in the case of an embodiment in which a low viscosity is desired, it is preferred. To set the content to be small.

Further, the compound represented by the formula (VIII-d) is preferably a compound represented by the formula (VIII-d-1).

(wherein R ⁵¹ and R ⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

Further, the compound represented by the formula (VIII-d-1) is preferably a compound represented by the formula (VIII-d-1-1) to the formula (VIII-d-1-4), preferably a formula (VIII-d). -1-1) or / and a compound represented by the formula (VIII-d-1-2).

Further, the compound represented by the formula (VIII-d) is preferably a compound represented by the formula (VIII-d-2).

(wherein R ⁵¹ and R ⁵² each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms).

Further, the compound represented by the formula (VIII-d-2) is preferably a compound represented by the formula (VIII-d-2-1) to the formula (VIII-d-2-4), preferably a formula (VIII-d). -2-1) or / and a compound represented by the formula (VIII-d-2-2).

The liquid crystal composition of the present invention may further contain one or more compounds represented by the formula (IX-a).

(wherein R ⁶¹ and R ⁶² each independently represent a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms or a linear alkenyl group having 2 to 10 carbon atoms).

The type of the compound which can be combined is not particularly limited, and is preferably one or three kinds of these compounds depending on the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. More preferably, it is one type to four types, and more preferably one type to five or more types. Further, the ratio which can be most contained is preferably 30% by mass or less, more preferably 25% by mass or less, and still more preferably 15% by mass or less.

Further, the range of the preferable content is preferably 5% by mass or more and 35% by mass or less, more preferably 10% by mass or more and 20% by mass or less, and still more preferably 5% by mass or more and 15% by mass or less.

Specifically, the compound represented by the formula (IX-a) can be preferably used.

The liquid crystal composition of the present invention may further contain one or more compounds represented by the formula (IX-b).

(wherein R ⁷¹ and R ⁷² each independently represent a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms or a linear alkenyl group having 4 to 10 carbon atoms) .

The type of the compound which can be combined is not particularly limited, and is preferably one or three kinds of these compounds depending on the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. More preferably, it is one type to four types, and more preferably one type to five or more types. Further, the ratio which can be most contained is preferably 30% by mass or less, more preferably 20% by mass or less, and still more preferably 15% by mass or less.

Further, the range of the preferable content is preferably 5% by mass or more and 30% by mass or less, more preferably 10% by mass or more and 20% by mass or less, and still more preferably 5% by mass or more and 15% by mass or less.

Specifically, the compound represented by the formula (IX-b) can preferably use the compounds listed below.

The 1,4-cyclohexyl group in the present case is preferably a trans-1,4-cyclohexyl group.

The liquid crystal composition of the present invention preferably contains one or more compounds selected from the group consisting of the formula (X).

(wherein R ^X1 and R ^X2 independently of each other represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and are present in the groups One methylene group or two or more methylene groups which are not adjacent may be substituted with -O- or -S-, and one or more hydrogen atoms present in the groups may be substituted a fluorine atom or a chlorine atom, u and v each independently represent 0, 1 or 2, and u+v is 2 or less, and M ^X1 , M ^X2 and M ^X3 are independently selected from (a) trans-1,4- The cyclohexylene group (one methylene group present in the group or two or more methylene groups not adjacent thereto may be substituted with -O- or -S-), and (b) 1,4-phenylene a group (one present in the group -CH= or two or more adjacent to -CH= may also be replaced by -N=)

The group in the group of the composition, the hydrogen atom contained in the above group (a) or the group (b) may be substituted with a cyano group, a fluorine atom, a trifluoromethyl group, a trifluoromethoxy group or a chlorine atom, respectively. When there are a plurality of cases where M ^X2 and/or M ^X3 are present, these may be the same or different, and L ^X1 , L ^X2 and L ^X3 independently represent a single bond, -COO-, -OCO-, -CH ₂ CH _{2 .} -, -(CH ₂ ) ₄ -, -OCH ₂ -, -CH ₂ O-, -OCF ₂ -, -CF ₂ O-, -CH=CH- or -C≡C-, at L ^X1 and/or When a plurality of L ^X3 are present, the same may be the same, x ^X1 and x ^X2 independently of each other represent a trifluoromethyl group, a trifluoromethoxy group or a fluorine atom, and any of X ³¹ and X ³² represents fluorine. An atom, except for the compound represented by the formula (XII-1-5) or (XII-1-6).

When R ^X1 and R ^{X2 are} bonded to a phenyl group (aromatic), a linear alkyl group having 1 to 5 carbon atoms and a linear carbon number of 1 to 4 are preferable. (or more) alkoxy groups and alkenyl groups having 4 to 5 carbon atoms, wherein the ring structure of the bond is cyclohexane, pyran and In the case of a saturated ring structure such as an alkane, a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 (or more) carbon atoms, and a linear chain are preferable. The number of carbon atoms is 2 to 5 alkenyl groups.

In the case where the improvement of the response speed of the display element is emphasized, the alkenyl group is preferred, and in the case of reliability such as a voltage holding ratio, an alkyl group is preferred. The alkenyl group is preferably a formula (Alkenyl-1)~(Alkenyl-4) as described below.

(in the formula, set the right end to the ring structure)

In the case where the liquid crystal composition of the invention of the present invention contains a reactive monomer, the structure represented by the formula (Alkenyl-2) and the formula (Alkenyl-4) is preferred, and the formula (Alkenyl-2) is more preferred. The structure.

When the compound represented by the formula (X) is required to have chemical stability of the liquid crystal composition, it is preferred that the compound does not have a sulfur atom, a nitrogen atom, an ester group, a cyano group or a chlorine atom in its molecule.

The type of the compound which can be combined is not particularly limited, and it is suitably used in combination according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Further, in another embodiment of the present invention, there are three types. Further, in another embodiment of the present invention, there are four types. Further, in another embodiment of the present invention, there are five types. Further, in another embodiment of the present invention, there are six types. Further, in another embodiment of the present invention, there are seven types. Further, in another embodiment of the present invention, there are eight types. Further, in another embodiment of the present invention, there are nine types. Further, in another embodiment of the present invention, it is 10 or more.

In the liquid crystal composition of the present invention, the content of the compound represented by the formula (X) needs to be based on solubility at low temperature, transfer temperature, electrical reliability, birefringence, process suitability, dripping trace, afterimage, The dielectrics are required to be properly adjusted for performance requirements.

With respect to the lower limit of the preferred content, the total amount of the liquid crystal composition of the present invention is, for example, 15% in another embodiment of the present invention. Further, in another embodiment of the present invention, it is 25%. Further, in another embodiment of the present invention, it is 30%. Further, in another embodiment of the present invention, it is 40%. Further, in another embodiment of the present invention, it is 45%.

Further, the upper limit of the preferable content is, for example, 75% in the other embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Further, in another embodiment of the present invention, it is 65%. Further, in another embodiment of the present invention, it is 55%. Further, in another embodiment of the present invention, it is 50%.

The range of the preferable content is, for example, 10 to 65% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 15 to 60%. Further, in another embodiment of the present invention, it is 30 to 60%. Further, in another embodiment of the present invention, it is 40 to 55%.

In the case where it is necessary to keep the viscosity of the liquid crystal composition of the present invention low and the response speed is high, it is preferable that the lower limit value is high and the upper limit value is high. Further, in the case where it is necessary to maintain a liquid crystal composition having a high T _ni of the liquid crystal composition of the present invention and having a good temperature stability, it is preferred that the lower limit value is high and the upper limit value is high. Further, when it is desired to increase the dielectric inductivity in order to maintain a low driving voltage, it is preferable that the lower limit value is low and the upper limit value is low.

Further, the compound represented by the formula (X) is preferably a compound represented by the formula (XI).

(Wherein, R and ^X1 represents formula (X) R is the same in the meaning of ^X1, M ^X1 represents the same meaning as in the general formula (X) M ^X1, R ^X2 represents in the general formula (X) R ^The same meaning of ^X2 ).

The lower limit of the preferable content in the case of containing the compound represented by the formula (XI) is, for example, 3% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 7%. Or in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 11%. Further, in another embodiment of the present invention, it is 14%. Further, in another embodiment of the present invention, it is 20%. Further, in another embodiment of the present invention, it is 30%.

Further, the upper limit of the preferable content is, for example, 55% based on the total amount of the liquid crystal composition of the present invention, in another embodiment of the present invention. Further, in another embodiment of the present invention, it is 45%. Further, in another embodiment of the present invention, it is 35%.

In the case of containing a compound represented by the general formula (XI), as a preferred content The range is preferably from 5 to 35% by mass, more preferably from 7 to 25% by mass, even more preferably from 11 to 21% by mass, even more preferably from 13 to 16% by mass.

In the formula (XI), R ^{X1 is} preferably an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, more preferably an alkyl group having 1 to 8 carbon atoms, more preferably The alkyl group having 3 to 5 carbon atoms is more preferably an alkyl group having 3 or 5 carbon atoms, more preferably a straight chain, and preferably a linear chain.

In the formula (XI), R ^X2 preferably represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or 2 to 8 carbon atoms. The alkenyloxy group preferably represents an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms, more preferably an alkyl group having 3 to 5 carbon atoms or 2 to 4 carbon atoms. The alkoxy group is more preferably an alkyl group having 3 or 5 carbon atoms or an alkoxy group having 2 or 4 carbon atoms, and still more preferably an alkoxy group having 2 or 4 carbon atoms, preferably straight. chain.

When attention is paid to the improvement of the response speed of the display element, it is preferably an alkenyl group, and when reliability is considered as a voltage holding ratio, it is preferably an alkyl group.

The type of the compound which can be combined is not particularly limited, and it is suitably used in combination according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Further, in another embodiment of the present invention, there are three types. Further, in another embodiment of the present invention, there are four types. Further, in another embodiment of the present invention, it is five or more.

The compound represented by the formula (XI) may be used alone or in combination of two or more. It is preferred to use three or more kinds. When two or more compounds represented by the formula (XI) are used, R ^X1 represents an alkyl group having 3 to 5 carbon atoms, and R ^X2 represents an alkoxy group having 2 to 4 carbon atoms. When a compound of the formula (XI) is used in combination and used in combination with a compound represented by the other formula (XI), R ^X1 represents an alkyl group having 3 to 5 carbon atoms, and R ^X2 represents carbon. The content of the compound of the formula (XI) having an alkoxy group having 2 to 4 atoms is preferably 50% by mass or more, more preferably 70% by mass or more, and still more preferably 70% by mass or more. 80% by mass or more. The preferred range is preferably 50% by mass or more and 70% by mass or less, more preferably 70% by mass or more and 80% by mass or less, and still more preferably 80% by mass or more and 100% or less.

In the formula (XI), M ^X1 represents 1,4-cyclohexylene, 1,4-phenylene or tetrahydropyran-2,5-diyl, and M ^X1 represents 1,4-phenylene. In this case, one or more hydrogen atoms of the 1,4-phenylene group may be substituted with a fluorine atom, preferably a 1,4-cyclohexylene group or a 1,4-phenylene group, more specifically In the display element and the liquid crystal display produced by using the liquid crystal composition of the invention, when the response speed is emphasized, it is preferable to express 1,4-phenylene. When the operating temperature range is emphasized, it is required. In the case of a high operating temperature range (T _ni high), it is preferably a 1,4-cyclohexylene group, and in the case of a 1,4-phenylene group, one or more hydrogen atoms in the benzene ring may be used. It is substituted with fluorine, preferably unsubstituted, substituted 1 or substituted 2, more preferably unsubstituted. In the case where two are substituted, it is preferably a 2,3-difluoro-1,4-phenylene group.

Specifically, the compound represented by the formula (XI) is preferably a compound selected from the group consisting of the formula (XI-1) and/or the formula (XI-2) described below.

(wherein R ^X11 , R ^X21 , R ^X12 and R ^X22 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms or An alkenyl group having 2 to 5 carbon atoms).

When R ^X21 , R ^X12 and R ^X22 are alkenyl groups, the number of carbon atoms is preferably 4 to 5. R ^{X11 is} preferably an alkyl group or an alkenyl group, more preferably an alkyl group, and R ^X21 and R ^{X22 are} preferably an alkyl group or an alkoxy group. When the absolute value of Δ ε is increased, an alkoxy group is preferred. Or an alkenyloxy group, more preferably an alkoxy group, and R ^{X12 is} preferably an alkyl group or an alkenyl group, preferably an alkyl group.

The liquid crystal composition of the present invention requires a compound represented by the formula (i), but when used in combination with the compound represented by the general formula (XI-1), the total amount thereof is preferably from 5 to 40% by mass, more preferably 10 to 35 mass%, and more preferably 12 to 30 mass%.

Specifically, the compound represented by the formula (XI) is preferably a formula (XI-1-1) to a formula (XI-2-4) described below.

The compound represented by the formula (XI-1-1) to the formula (XI-1-3), the formula (XI-2-1) and the formula (XI-2-2) are more preferably a compound. (XI-1-1)~ a compound represented by the formula (XI-1-3) and the formula (XI-2-1), and more specifically, the refractive index anisotropy required for the liquid crystal composition of the invention of the present invention When the value of Δn is relatively low (about 0.100), the compound represented by formula (XI-1-1) and formula (XI-1-3) is preferably the desired refractive index anisotropy. When the value of Δn is relatively high (about 0.100 or more), the compound represented by the formula (XI-2-1) is preferable.

When the compound represented by the formula (XI) has an alkenyl group, specifically, it is preferably selected from the group represented by the formula (XI-1-10) to the formula (XI-2-11) described below. Compound,

(wherein R ^X22 represents the same meaning as R ^X22 in the formula (XI-2)).

Further, the compound represented by the formula (X) is preferably a compound represented by the formula (XII).

(Wherein, R and ^X1 represents formula (X) R is the same in the meaning of ^X1, M ^X2 represents the same meaning as in the general formula (X) M ^X2, R ^X2 represents in the general formula (X) R ^{X2 has the} same meaning, except for the compound represented by the formula (XII-1-5) or (XII-1-6).

The lower limit of the preferable content in the case of containing the compound represented by the formula (XII) is, for example, 5% in the other embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 10%. Further, in another embodiment of the present invention, it is 15%. Further, in another embodiment of the present invention, it is 20%. Further, in the present invention In one embodiment, it is 30%.

Further, the upper limit of the preferable content is, for example, 55% based on the total amount of the liquid crystal composition of the present invention, in another embodiment of the present invention. Further, in another embodiment of the present invention, it is 45%. Further, in another embodiment of the present invention, it is 35%.

Further, the range of the preferable content is, for example, 5 to 55% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 5 to 50%. Or in another embodiment of the present invention, it is 10 to 45%. Further, in another embodiment of the present invention, it is 15 to 40%. Further, in another embodiment of the present invention, it is 20 to 40%. Further, in another embodiment of the present invention, it is 25 to 40%.

In the formula (XII), R ^X1 preferably represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or a carbon number of 2 to 8 The alkenyloxy group preferably represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, more preferably an alkyl group having 1 to 8 carbon atoms, and still more preferably a carbon atom. The alkyl group having 2 to 5 is preferably an alkyl group having 3 to 5 carbon atoms, preferably a linear chain.

In the formula (XII), R ^X2 preferably represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or 2 to 8 carbon atoms. The alkenyloxy group preferably represents an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms, more preferably an alkyl group having 1 to 5 carbon atoms or 1 to 4 carbon atoms. The alkoxy group is more preferably an alkoxy group having 1 to 4 carbon atoms, more preferably an alkoxy group having 2 or 3 carbon atoms, and is preferably a straight chain.

In the case where the improvement of the response speed of the display element is emphasized, the alkenyl group is preferred, and in the case of reliability such as a voltage holding ratio, an alkyl group is preferred.

The compound represented by the formula (XII) is further preferably a compound represented by the formula (XII-1) and the formula (XII-2).

(Wherein, R and ^X1 represents formula (X) R is the same in the meaning of ^{X1, X2} R represents general formula (X), ^X2 of the same meaning as R in the general formula (XII-1), the formula (XII -1-5) or (except for the compound represented by (XII-1-6)).

Specifically, the compound represented by the formula (XII-1) is preferably a formula (XII-1-1) to (XII-1-4) and a formula (XII-1-7) to (XII-) as described below. 1-8)

The compound represented by the formula (XII-1-1) to the formula (XII-1-4), the compound represented by the formula (XII-1-7), more preferably the formula (XII-1-1)~ (XII-1-3), a compound represented by the formula (XII-1-7), particularly preferably a formula (XII-1-1), a formula (XII-1-3) and a formula (XII-1-7) Compound.

When the compound represented by the formula (XII-1) has an alkenyl group, specifically, a compound represented by the formula (XII-1-10) to (XII-1-13) described below is preferred. ,

(wherein R ^X2 represents the same meaning as R ^X2 in the formula (X)).

Specifically, the compound represented by the formula (XII-2) is preferably a formula (XII-2-1) to (XII-2-6) described below.

The compound represented by the formula (XII-2-1) to the formula (XII-2-4) is more preferably a compound of the formula (XII-2-1) to (XII-2-3). The compound is particularly preferably a compound represented by the formula (XII-2-1) and the formula (XII-2-3).

When the compound represented by the formula (XII-2) has an alkenyl group, specifically, a compound represented by the formula (XII-2-10) to (XII-2-13) described below is preferable.

(wherein R ^X2 represents the same meaning as R ^X2 in the formula (X)).

The type of the compound which can be combined is not particularly limited, and it is suitably used in combination according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Further, in another embodiment of the present invention, there are three types. Further, in another embodiment of the present invention, there are four types. Further, in another embodiment of the present invention, there are five types. Further, in another embodiment of the present invention, it is six or more.

When four or more compounds represented by the formula (XII) are used, it is preferred to use a combination of the compounds represented by the formula (XII-2-1) to the formula (XII-2-4), and the formula (XII-2) The content of the compound represented by the formula (XII-2-4) is preferably 40% by mass or more, and more preferably 50% by mass or more, based on the compound represented by the formula (XII).

The range of the preferable content is preferably 40% by mass or more and 70% by mass or less.

When three compounds represented by the formula (XII) are used, it is preferred to use a compound represented by the formula (XII-2-1) to the formula (XII-2-3) in combination (XII-2- The content of the compound represented by the formula (XII-2-3) is preferably 40% by mass or more, and more preferably 50% by mass or more based on the compound represented by the formula (XII).

The range of the preferable content is preferably 40% by mass or more and 70% by mass or less, and more preferably 50% by mass or more and 70% by mass or less.

When two compounds represented by the formula (XII) are used, it is preferred to use a compound represented by the formula (XII-2-1) to the formula (XII-2-2) in combination (XII-2- The content of the compound represented by the formula (XII-2-2) is preferably 40% by mass or more, and more preferably 50% by mass or more, based on the compound represented by the formula (XII).

The range of the preferable content is preferably 40% by mass or more and 70% by mass or less, and more preferably 50% by mass or more and 80% by mass or less.

Further, the compound represented by the formula (X) is preferably a compound represented by the formula (XIII).

(wherein R ^X1 represents the same meaning as R ^X1 in the formula (X), M ^X31 represents the same meaning as M ^X1 in the formula (X), and R ^X2 represents R in the formula (X) ^{X2 has the} same meaning, W represents 0 or 1, X ³¹ ~ X ³⁶ represents a hydrogen atom or a fluorine atom, a combination of X ³¹ and X ³² , a combination of X ³³ and X ³⁴ , and at least one of a combination of X ³⁵ and X ³⁶ The combination is a fluorine atom; wherein the compound represented by the formula (XIII-1-2) or the formula (XIII-1-4) is excluded).

The type of the compound which can be combined is not particularly limited, and it is suitably used in combination according to the required properties such as solubility at low temperature, transfer temperature, electrical reliability, and birefringence. The type of the compound to be used is, for example, one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Further, in another embodiment of the present invention, there are three types. Further, in another embodiment of the present invention, there are four types. Further, in another embodiment of the present invention, it is five or more.

The lower limit of the preferable content in the case of containing the compound represented by the general formula (XIII), in the case where the lower limit is present, relative to the total amount of the liquid crystal composition of the present invention, For example, an embodiment of the present invention is 1%. Or in another embodiment of the present invention, it is 3%. Or in another embodiment of the present invention, it is 5%. Further, in another embodiment of the present invention, it is 8%. Further, in another embodiment of the present invention, it is 10%. On the other hand, it is 0% which is an embodiment in which the lower limit value does not exist.

Further, the upper limit of the preferable content is, for example, 28% in the other embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Further, in another embodiment of the present invention, it is 20%. Further, in another embodiment of the present invention, it is 15%.

The range of the preferable content is, for example, 1 to 25% as an embodiment of the present invention with respect to the total amount of the liquid crystal composition of the present invention. Or in another embodiment of the present invention, it is 3 to 20%. Or in another embodiment of the present invention, it is 5 to 15%.

In the formula (XIII), R ^X1 and R ^X2 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or carbon. The alkenyloxy group having 2 to 8 atomic atoms preferably represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, more preferably an alkyl group having 1 to 8 carbon atoms, and thus more preferably The alkyl group having 2 to 5 carbon atoms is particularly preferably an alkyl group having 3 to 5 carbon atoms. Most preferably, the number of carbon atoms of R ¹ and R ² is different, and is preferably a linear chain.

In the formula (XIII), X ³¹ to X ³⁶ each independently represent a hydrogen atom or a fluorine atom, preferably 2 to 5 fluorine atoms, more preferably 2 to 4 fluorine atoms, more preferably It means 2 to 3 fluorine atoms, and more preferably 2 fluorine atoms.

In this case, in the case where the number of fluorine atoms is two, it is preferred that any two of X ³³ to X ³⁶ represent a fluorine atom, and preferably a combination of X ³³ and X ³⁴ represents a fluorine atom or X ³⁵ and X ^{36 .} The combination of all represents a fluorine atom, and more preferably, the combination of X ³³ and X ³⁴ represents a fluorine atom. When the number of fluorine atoms is three or more, it is preferred that at least the combination of X ³³ and X ³⁴ represents a fluorine atom or at least a combination of X ³⁵ and X ³⁶ represents a fluorine atom, more preferably at least X ³³ and X ³⁴ Combinations all indicate a fluorine atom.

In the formula (XIII), it is preferred that M ^X31 represents a display of 1,4-cyclohexylene, 1,4-phenylene or tetrahydropyran-2,5-diyl, which is produced using the liquid crystal composition. In the case of a component and a liquid crystal display, when the response speed is emphasized, it is preferably a 1,4-phenylene group or a tetrahydropyran-2,5-diyl group, and more preferably a 1,4-phenylene group. When the driving voltage is emphasized, it is preferably a 1,4-phenylene group or a tetrahydropyran-2,5-diyl group, and more preferably a tetrahydropyran-2,5-diyl group. When the operating temperature range is emphasized, that is, when a high operating temperature range is required, it preferably represents 1,4-cyclohexylene or tetrahydropyran-2,5-diyl, and more preferably represents 1,4. - Stretch the ring hexyl. When 1,4-phenylene is present, one or more hydrogen atoms in the benzene ring may be substituted with a fluorine atom, preferably unsubstituted, substituted or substituted by two. When two are substituted, it is preferably a 2,3-difluorobenzene-1,4-diyl group.

In the general formula (XIII), W represents 0 or 1. When the response speed is emphasized, it is preferably 0. When the operating temperature range is emphasized, that is, when a high operating temperature range is required, it is preferably expressed. 1.

The compound represented by the formula (XIII) is preferably a formula (XIII-1) to (XIII-43) as described below.

(Wherein, R and ^X1 represents formula (X) in the ^X1 same meaning as the R, R represents ^{an X2} in the general formula (R the same meaning as ^X2) in the X) of the compound represented, preferably of the general formula (XIII - 1) a compound represented by (XIII-10), (XIII-12), (XIII-20), (XIII-22), (XIII-40) and (XIII-42), preferably a formula (XIII-) 1), a compound represented by (XIII-2), (XIII-10), (XIII-12), (XIII-20), (XIII-22), (XIII-40) and (XIII-42), preferably The compound represented by the formula (XIII-1) and (XIII-2) is more preferably a compound represented by the formula (XIII-1).

Specifically, the compound represented by the formula (XIII-1) is preferably a compound represented by the formula (XIII-1-1) to the formula (XIII-1-16).

Among the above compounds, preferred are compounds represented by the formula (XIII-1-1) to the formula (XIII-1-6), preferably a formula (XIII-1-1), a formula (XIII-1-2) or A compound represented by the formula (XIII-1-4).

R ^X1 and R ^X2 in the formula (XIII) each independently represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or 2 carbon atoms. The alkenyloxy group of ~8 preferably represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms, more preferably an alkyl group having 2 to 5 carbon atoms or 2 to 2 carbon atoms. The alkenyl group of 5 is more preferably an alkyl group having 2 to 5 carbon atoms, and is preferably a straight chain. When both R ^X1 and R ^X2 are alkyl groups, it is preferred that the number of carbon atoms is different.

More specifically, R ^X1 represents a propyl group and R ^X2 represents an ethyl compound or R ^X1 represents a butyl group and R ^X2 represents an ethyl group.

The liquid crystal composition of the present invention can be used in a wide range of nematic phase-isotropic liquid phase transition temperature (T _NI ), preferably 60 to 120 ° C, more preferably 70 to 100 ° C, and particularly preferably 70. ~90 ° C.

The liquid crystal composition of the present invention requires a compound of the formula (i) and the formula (XII-1-5) or the compound of the formula (XII-1-6), and as a better aspect, the formula (L) and the pass may be contained. A compound represented by the formula (XI-1), the formula (XII-1), the formula (XII-2) or the formula (XIII). In this case, the content is preferably as described below.

When the compound represented by the formula (i), the formula (XII-1-5) or the formula (XII-1-6) and the formula (L) is contained, the total content of the compounds is preferably 20% by mass. 70% by mass, more preferably 25 to 65% by mass, and still more preferably 28 to 60% by mass.

When the compound represented by the formula (i), the formula (XII-1-5) or the formula (XII-1-6) and the formula (XI-1) is contained, the total content of the compounds is preferably 35~ 80% by mass, more preferably 38 to 75% by mass, still more preferably 40% by mass to 70% by mass.

Containing formula (i), formula (XII-1-5) or formula (XII-1-6), formula (L), formula (XI-1), formula (XII-1) and formula ( In the case of the compound represented by XII-2), the total content of the compounds is preferably from 70 to 100% by mass, more preferably from 80 to 100% by mass, still more preferably from 85 to 100% by mass.

Containing formula (i), formula (XII-1-5) or formula (XII-1-6), formula (L), formula (XI-1), formula (XII-1), formula ( In the case of the compound represented by the formula (IIIII) or the formula (XIII), the total content of the compounds is preferably from 80 to 100% by mass, more preferably from 85 to 100% by mass, still more preferably from 90 to 100% by mass. .

When the compound used in the invention of the present invention requires chemical stability of the liquid crystal composition, it is preferred that the compound does not have a chlorine atom in its molecule. Further, the compound having a chlorine atom in the liquid crystal composition is preferably 5% or less, preferably 3% or less, preferably 1% or less, preferably 0.5% or less, and preferably substantially not contained. The term "substantially free" means that a compound which is formed only as an impurity, such as a compound which is inadvertently contained in a chlorine atom, is mixed into the liquid crystal composition.

The compound used in the invention of the present invention does not have a peroxy (-CO-OO-) structure in the molecule. Further, in the case where the reliability and long-term stability of the liquid crystal composition are emphasized, it is preferred not to use a compound having a cyano group or a carbonyl group. Further, in the case where the stability by UV irradiation is emphasized, it is preferred not to use a compound substituted with a chlorine atom. It is also preferred that only the ring structure in the molecule is a 6-membered ring.

The value of the dielectric index Δε of the liquid crystal composition of the present invention is preferably from -2.0 to -6.0, more preferably from -2.5 to -5.0, still more preferably from -2.5 to -4.0 at 25 ° C. Further, in the case where the response speed is emphasized, it is preferably -2.5 to -3.4, and when the driving voltage is emphasized, it is preferably -3.4 to -4.0.

The value of the refractive index anisotropy Δn of the liquid crystal composition of the present invention is preferably from 0.08 to 0.13, more preferably from 0.09 to 0.12 at 25 °C. More specifically, it is preferably 0.10 to 0.12 in the case of a thin cell gap, and preferably 0.08 to 0.10 in the case of a thick cell gap.

The rotational viscosity (γ ₁ ) of the liquid crystal composition of the present invention is preferably 150 or less, more preferably 130 or less, and still more preferably 120 or less.

In the liquid crystal composition of the present invention, Z which is a function of rotational viscosity and refractive index anisotropy preferably represents a specific value.

(wherein γ ₁ represents a rotational viscosity, and Δn represents a refractive index anisotropy).

Z is preferably 13,000 or less, more preferably 12,000 or less, and still more preferably 11,000 or less.

The liquid crystal composition used in the present invention when the active matrix display device in the case, it must be above 10 ¹² (Ω.m) specific resistance, preferably 10 ¹³ (Ω.m), more preferably of 10 ¹⁴ (Ω .m) above.

The liquid crystal composition of the present invention may contain, in addition to the above compounds, depending on the use. There are a usual nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal, an antioxidant, an ultraviolet absorber, a polymerizable monomer, and the like.

The polymerizable monomer is preferably a difunctional monomer represented by the formula (P).

(wherein, X ⁷ and X ⁸ each independently represent a hydrogen atom or a methyl group, and Sp ¹ and Sp ² each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms or -O-(CH ₂ ) _s - (wherein s represents an integer from 2 to 7, the oxygen atom is bonded to the aromatic ring), and Z ² represents -OCH ₂ -, -CH ₂ O-, -COO-, -OCO-, -CF ₂ O- , -OCF ₂ -, -CH ₂ CH ₂ -, -CF ₂ CF ₂ -, -CH=CH-COO-, -CH=CH-OCO-, -COO-CH=CH-, -OCO-CH=CH -, -COO-CH ₂ CH ₂ -, -OCO-CH ₂ CH ₂ -, -CH ₂ CH ₂ -COO-, -CH ₂ CH ₂ -OCO-, -COO-CH ₂ -, -OCO-CH ₂ -, -CH ₂ -COO-, -CH ₂ -OCO-, -CY ¹ =CY ² - (wherein Y ¹ and Y ² each independently represent a fluorine atom or a hydrogen atom), -C≡C- or a single bond B represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond, and any hydrogen atom of all 1,4-phenylene groups in the formula may be substituted with a fluorine atom).

Preferably, each of X ⁷ and X ⁸ represents a diacrylate derivative of a hydrogen atom, and a dimethacrylate derivative each having a methyl group, and preferably one of them represents a hydrogen atom, and the other represents a hydrogen atom. A compound of methyl. Regarding the polymerization rate of the compounds, the diacrylate derivative is the fastest, the dimethacrylate derivative is slow, and the asymmetric compound is in between, and a preferred aspect can be used depending on the use thereof. Among the PSA display elements, a dimethacrylate derivative is particularly preferred.

Sp ¹ and Sp ² each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms or -O-(CH ₂ ) _s -, and preferably at least one of the PSA display elements is a single bond. The compounds which each represent a single bond or one of which is a single bond and the other represents an alkylene group having 1 to 8 carbon atoms or -O-(CH ₂ ) _s -. In this case, it is preferably an alkyl group of 1 to 4, and s is preferably 1 to 4.

Z ^{1 is} preferably -OCH ₂ -, -CH ₂ O-, -COO-, -OCO-, -CF ₂ O-, -OCF ₂ -, -CH ₂ CH ₂ -, -CF ₂ CF ₂ - or The key is more preferably -COO-, -OCO- or a single bond, and particularly preferably a single bond.

B represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond in which an arbitrary hydrogen atom may be substituted with a fluorine atom, preferably a 1,4-phenylene group or a single bond. In the case where C represents a ring structure other than a single bond, Z ^{2 is} also preferably a linking group other than a single bond. When C is a single bond, Z ^{1 is} preferably a single bond.

In these terms, in the general formula (P), the ring structure between Sp ¹ and Sp ² is specifically preferably the structure described below.

In the general formula (P), when C represents a single bond and the ring structure is formed by two rings, it preferably represents the following formula (Pa-1) to formula (Pa-5).

(where the two ends are set to be bonded to Sp ¹ or Sp ² )

More preferably, it is a formula (Pa-1) to a formula (Pa-3), and particularly preferably a formula (Pa-1).

Since the orientation restricting force after polymerization of the polymerizable compound containing the skeleton is most suitable for the PSA type liquid crystal display element, a good orientation state can be obtained, and display unevenness is suppressed or does not occur at all.

From the above, as the polymerizable monomer, a formula (Pa-1-1) to a formula (Pa-1-4) is preferable, and among them, a formula (Pa-1-2) is preferred.

(wherein, Sp ² represents an alkylene group having 2 to 5 carbon atoms).

In the case where a monomer is added to the liquid crystal composition of the present invention, the polymerization is carried out in the absence of a polymerization initiator, but a polymerization initiator may be contained in order to promote the polymerization. Examples of the polymerization initiator include benzoin ethers, benzophenones, acetophenones, benzyl ketals, and mercaptophosphine oxides. Further, in order to improve storage stability, a stabilizer may be added. Examples of stabilizers that can be used include hydroquinones, hydroquinone monoalkyl ethers, tertiary butyl catechols, gallic phenols, thiophenols, and nitro compounds. , β -naphthylamines, β -naphthols, nitroso compounds, and the like.

The liquid crystal composition of the present invention may further contain a compound represented by the formula (Q).

(wherein R ^Q represents a linear alkyl group or a branched alkyl group having 1 to 22 carbon atoms, and one or two or more CH ₂ groups in the alkyl group may be substituted with an oxygen atom not directly adjacent thereto. -O-, -CH=CH-, -CO-, -OCO-, -COO-, -C=C-, -CF ₂ O-, -OCF ₂ -, M ^Q represents a trans-1,4-extension ring Hexyl, 1,4-phenylene or single bond).

R ^Q represents a linear alkyl group or a branched alkyl group having 1 to 22 carbon atoms, and one or more of the CH ₂ groups in the alkyl group may be substituted with -O- in such a manner that the oxygen atoms are not directly adjacent to each other. -CH=CH-, -CO-, -OCO-, -COO-, -C≡C-, -CF ₂ O-, -OCF ₂ -, preferably a linear alkyl group having 1 to 10 carbon atoms, a straight-chain alkoxy group, a straight-chain alkyl group in which one CH ₂ group is substituted with -OCO- or -COO-, a branched alkyl group, a branched alkoxy group, and one CH ₂ group is substituted with -OCO- or a branched alkyl group of -COO-, more preferably a linear alkyl group having 1 to 20 carbon atoms, a linear alkyl group in which one CH ₂ group is substituted with -OCO- or -COO-, a branched alkyl group, The branched alkoxy group and one CH ₂ group are substituted with a branched alkyl group of -OCO- or -COO-. M ^Q represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group or a single bond, preferably a trans-1,4-cyclohexylene group or a 1,4-phenylene group.

More specifically, the compound represented by the formula (Q) is preferably a compound represented by the following formula (Q-a) to formula (Q-d).

In the formula, R ^{Q1 is} preferably a linear alkyl group or a branched alkyl group having 1 to 10 carbon atoms, and R ^{Q2 is} preferably a linear alkyl group or a branched alkyl group having 1 to 20 carbon atoms, and R ^Q3 is more preferred. Preferably, it is a linear alkyl group having 1 to 8 carbon atoms, a branched alkyl group, a linear alkoxy group or a branched alkoxy group, and L ^{Q is} preferably a linear alkyl group or a branch having 1 to 8 carbon atoms. Chain alkyl. Among the compounds represented by the formula (Qa) to the formula (Qd), a compound represented by the formula (Qc) and the formula (Qd) is more preferred. In the liquid crystal composition of the present invention, it is preferred to contain one or two kinds of compounds represented by the formula (Q), more preferably one to five, and the content thereof is preferably from 0.001 to 1% by mass, more preferably It is 0.001 to 0.1% by mass, and particularly preferably 0.001 to 0.05% by mass.

The liquid crystal composition containing the polymerizable compound of the present invention is useful for a liquid crystal display element, and is particularly useful for a liquid crystal display element for active matrix driving, and can be used for a liquid crystal display element for PSA mode, PSVA mode, VA mode, IPS mode or ECB mode.

The liquid crystal composition containing the polymerizable compound of the present invention, wherein the polymerizable compound contained therein is polymerized by ultraviolet irradiation, thereby imparting liquid crystal directional energy, and is used for controlling light transmission by birefringence of the liquid crystal composition. A quantity of liquid crystal display elements. As a liquid crystal display element, for AM-LCD (active matrix liquid crystal display element), TN (nematic liquid crystal display element), STN-LCD (super twisted nematic liquid crystal display element), OCB-LCD, and IPS-LCD (coplanar switching) Liquid crystal display elements are useful, especially for AM-LCDs, and can be used for transmissive or reflective liquid crystal display elements.

The two substrates of the liquid crystal cell used in the liquid crystal display element may be made of glass or a transparent material such as plastic which is flexible, and may be an opaque material such as tantalum. The transparent substrate having the transparent electrode layer can be obtained, for example, by sputtering indium tin oxide (ITO) on a transparent substrate such as a glass plate.

The substrate is opposed to each other such that the transparent electrode layer is inside. At this time, the interval between the substrates can also be adjusted by the spacer. In this case, it is preferable to adjust the thickness of the obtained light control layer to 1 to 100 μm. More preferably, it is 1.5 to 10 μm. When a polarizing plate is used, it is preferable to adjust the product of the refractive index anisotropy Δn of the liquid crystal and the cell thickness d so that the contrast is maximized. Moreover, when there are two polarizing plates, the polarizing plates can also be adjusted. The polarization axis is adjusted to improve the viewing angle or contrast. Further, a retardation film for widening the viewing angle can be used. Examples of the separator include glass particles, plastic particles, alumina particles, and photoresist materials. Thereafter, a sealing agent such as an epoxy thermosetting composition is screen-printed on the substrate in a form in which a liquid crystal injection port is provided, and the substrates are bonded to each other and heated to thermally harden the sealing agent.

A method of sandwiching a liquid crystal composition containing a polymerizable compound between two substrates can be carried out by a usual vacuum injection method, an ODF method, or the like. In the vacuum injection method, although no dripping marks are generated, there is a problem that a trace of implantation remains. In the invention of the present invention, it can be preferably used by using a display element manufactured by the ODF method.

As a method of polymerizing a polymerizable compound, in order to obtain a good orientation property of a liquid crystal, a moderate polymerization rate is preferable, and therefore it is preferred to irradiate or sequentially irradiate an active energy ray such as an ultraviolet ray or an electron beam. And the method of making it aggregate. For the case of using ultraviolet rays, a polarized light source or a non-polarized light source may be used. In the case where the liquid crystal composition containing the polymerizable compound is polymerized in a state of being sandwiched between the two substrates, it is necessary to provide at least the substrate on the irradiation surface side with appropriate transparency to the active energy ray. Further, a method of using a mask to irradiate only a specific portion after light irradiation, changing the orientation state of the unpolymerized portion, and further irradiating the active energy ray by changing conditions such as an electric field, a magnetic field, or a temperature may be employed. It is polymerized. In particular, when ultraviolet exposure is performed, it is preferred to perform ultraviolet exposure while applying an alternating electric field to the liquid crystal composition containing the polymerizable compound. The applied alternating electric field is preferably an alternating current having a frequency of 10 Hz to 10 kHz, more preferably a frequency of 60 Hz to 10 kHz, and the voltage is selected depending on the pretilt angle required for the liquid crystal display element. That is, the pretilt angle of the liquid crystal display element can be controlled by the applied voltage. In the liquid crystal display element of the MVA mode, it is preferable to control the pretilt angle to 80 to 89.9 degrees from the viewpoint of orientation stability and contrast.

The temperature at the time of irradiation is preferably within a temperature range in which the liquid crystal state of the liquid crystal composition of the present invention is maintained. It is preferred to polymerize at a temperature close to room temperature, that is, typically at a temperature of 15 to 35 °C. As the lamp for generating ultraviolet rays, a metal halide lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, or the like can be used. Further, as the wavelength of the ultraviolet ray to be irradiated, it is preferable to irradiate the ultraviolet ray in the wavelength range of the absorption wavelength region of the non-liquid crystal composition, and it is preferable to use it as needed to cut off the ultraviolet ray. The intensity of the ultraviolet ray to be irradiated is preferably from 0.1 mW/cm ² to 100 W/cm ² , more preferably from 2 mW/cm ² to 50 W/cm ² . The amount of energy of the irradiated ultraviolet rays can be appropriately adjusted, preferably from 10 mJ/cm ² to 500 J/cm ² , more preferably from 100 mJ/cm ² to 200 J/cm ² . When the ultraviolet ray is irradiated, the intensity may also be changed. The time at which the ultraviolet ray is irradiated is appropriately selected depending on the intensity of the ultraviolet ray to be irradiated, and is preferably from 10 seconds to 3,600 seconds, more preferably from 10 seconds to 600 seconds.

The liquid crystal display device of the present invention is characterized in that it has a first substrate having a common electrode made of a transparent conductive material as shown in FIG. 1 and a pixel electrode and a control electrode made of a transparent conductive material. a second substrate of the thin film transistor of the pixel electrode included in each pixel; and a liquid crystal composition sandwiched between the first substrate and the second substrate, and the orientation of the liquid crystal molecules in the liquid crystal composition when no voltage is applied The liquid crystal composition of the present invention described above is used as the liquid crystal composition with respect to the liquid crystal display element which is substantially perpendicular to the substrate.

The occurrence of dripping marks is greatly affected by the liquid crystal material to be injected, and the influence cannot be avoided depending on the composition of the display elements. In particular, in a color filter, a thin film transistor, or the like formed in a liquid crystal display element, only a thin alignment film, a transparent electrode, and the like are separated from the liquid crystal composition, and thus the influence of the dropping trace is affected by the combination.

In particular, when the thin film transistor is of an inverted staggered type, the drain electrode is formed to cover the gate electrode, and thus the area thereof tends to increase. The drain electrode is formed of a metal material such as copper, aluminum, chromium, titanium, molybdenum or tantalum. Usually, the passivation treatment is carried out in a usual form. However, since the protective film is usually thin, the alignment film is also thin, and the possibility of not blocking the ionic substance is high, the occurrence of dripping marks caused by the interaction of the metal material and the liquid crystal composition cannot be avoided.

In the invention of the present invention, as shown in Fig. 2, it can be preferably used for a liquid crystal display element in which a thin film transistor is an inverted stagger type, which is preferable in the case of using an aluminum wiring.

The liquid crystal display element using the liquid crystal composition of the present invention is useful for simultaneously achieving high-speed response and suppressing display defects, and is particularly useful for active matrix driving liquid crystal display elements, and can be applied to VA mode, PSVA mode, PSA mode, IPS mode or Used in ECB mode.

[Examples]

The invention is illustrated in more detail below by way of examples, but the invention is not limited to the examples. In addition, "%" in the composition of the following examples and comparative examples means "% by mass".

In the examples, the measured characteristics are as follows.

T _NI : nematic phase-isotropic liquid phase transfer temperature (°C)

Δn: refractive index anisotropy at 20 ° C

△ ε: dielectric conductivity of 20 ° C

η: viscosity at 20 ° C (mPa.s)

γ ₁ : 20 ° C rotational viscosity (mPa.s)

VHR: Voltage holding ratio (%) at 50 °C at a frequency of 60 Hz and a voltage of 5 V

VHR after heat resistance test: The VHR measurement in which the liquid crystal composition was injected was held in a thermostat bath at 135 ° C for 45 minutes, and then measured under the same conditions as the above VHR measurement method.

Afterimage:

The afterimage evaluation of the liquid crystal display element is performed by displaying the specific fixed pattern for 2,000 hours in the display area, and the level of the afterimage of the fixed pattern when the entire screen is uniformly displayed is visually evaluated based on the following four levels. .

◎ no afterimage (very good grade)

○ Even if there are a very small number of afterimages, it is an acceptable level (good grade)

△ There is an afterimage and it is an unacceptable level (poor grade)

× has afterimage and is quite poor (level of difference)

Drop the trace:

The evaluation of the dripping trace of the liquid crystal display device was a white dripping trace when the entire surface was black-displayed, and was visually evaluated based on the following four grades.

◎ no afterimage (very good grade)

○ Even if there are a very small number of afterimages, it is an acceptable level (good grade)

△ There is an afterimage and it is an unacceptable level (poor grade)

× has afterimage and is quite poor (level of difference)

Process suitability:

The process suitability is in the ODF process, and 100000 times of using a fixed-volume metering pump to drop 30pL of liquid crystal once, and the following four grades evaluate the following "0~100 times, 101-200 times, 201-300 times, ...99901~100000 times" The change in the amount of liquid crystal dropped every 100 times.

◎The change is extremely small (the liquid crystal display element can be stably manufactured. Very good grade)

○ Even if there is a small amount of change, it is a tolerable grade (good grade)

△ There is a change and it is an unacceptable level (the yield is deteriorated due to the occurrence of spots. The grade is not good)

×Changed and quite poor (liquid crystal leakage or vacuum bubble generation) (grade of difference)

Solubility at low temperatures:

The low-temperature solubility evaluation was carried out after the preparation of the liquid crystal composition, and 1 g of the liquid crystal composition was placed in a 2 mL sample vial, and among the temperature-controlled test tanks, the following was set to 1 cycle "-30 ° C (for 1 hour). )→temperature (0.1°C/min)→0°C (for 1 hour)→temperature (0.1°C/min)→20°C (for 1 hour)→cooling (-0.1°C/min)→0°C (keep The temperature change was continuously applied for 1 hour)→cooling (−0.1° C./min)→-30° C., and the generation of precipitates derived from the liquid crystal composition was visually observed, and the following four grades were evaluated.

◎ No precipitate was observed for 576 hours or longer. (very good grade)

○ No precipitate was observed for 288 hours or more. (good grade)

△ The precipitate was observed within 144 hours. (bad grade)

× precipitate was observed within 72 hours. (level of difference)

Further, regarding the description of the compounds in the examples, the following abbreviations are used.

(side chain structure and joint structure)

(ring structure)

(Comparative Examples 1 and 2, Example 1)

A liquid crystal composition (LC-A~B, LC-1) having the composition shown below was prepared, and the physical property value was measured. The results are shown in the table below.

The VA liquid crystal display element shown in Fig. 1 was produced using each liquid crystal composition. The liquid crystal display element has an inversely staggered thin film transistor as an active element. The injection of the liquid crystal composition is carried out by a dropping method to perform afterimage, dripping marks, process suitability, and dissolution at a low temperature. Evaluation of sex.

Further, the symbol on the left side of the content is the description of the abbreviation of the above compound.

The liquid crystal composition LC-A of Comparative Example 1 contained the compound of the formula (i), but did not contain the compound of the formula (XII-1-5) and the formula (XII-1-6). The liquid crystal composition LC-B of Comparative Example 2 contains a compound of the formula (XII-1-5) and the formula (XII-1-6), but does not contain the compound of the formula (i).

In the liquid crystal composition LC-1 of the first embodiment, the viscosity η and the rotational viscosity γ _{1 were} lower than those of the liquid crystal composition of Comparative Example 1, and various panel evaluation performance, process suitability, and low-temperature solubility were excellent.

(Examples 2 to 4)

A liquid crystal composition (LC-2 to 4) having the composition shown below was prepared, and the physical property value thereof was measured. Further, according to the liquid crystal display element, the afterimage, the dripping trace, the process suitability, and the solubility at low temperature were evaluated. The results are shown below.

In the liquid crystal compositions LC-2 to 4 of Examples 2 to 4, it was found that the viscosity η and the rotational viscosity γ _{1 were} low, and various panel evaluation performance, process suitability, and low-temperature solubility were excellent.

(Example 5)

0.15% of the liquid crystal composition shown in Example 1 was added with 0.15% of the polymerizable compound shown below,

The polymerizable liquid crystal composition CLC-A was prepared by uniformly dissolving it. The physical properties of CLC-A were almost the same as those of the nematic liquid crystal composition shown in Example 1. CLC-A was injected by vacuum injection into a cell gap of 3.5 μm and coated with an ITO-attached unit of a polyimide-oriented oriented film that induces horizontal orientation. A rectangular wave having a frequency of 1 kHz was applied to the unit, and the liquid crystal cell was irradiated with ultraviolet rays by a high pressure mercury lamp through a filter that cuts off ultraviolet rays of 320 nm or less. The vertical alignment liquid crystal display element obtained by polymerizing the polymerizable compound in the polymerizable liquid crystal composition was obtained by adjusting the irradiation intensity on the surface of the cell to 10 mW/cm ² and irradiating for 600 seconds. The polymerization by the polymerizable compound confirmed that the orientation restriction force on the liquid crystal compound was generated.

Claims (8)

A liquid crystal composition having a negative dielectric conductivity and having a formula (i): a compound represented by the formula (XII-1-5) or (XII-1-6): Expressed as a compound. A liquid crystal composition according to claim 1 which contains a compound represented by the following formula (XII-2), (wherein R ^X1 and R ^X2 independently of each other represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms). A liquid crystal composition according to claim 1 or 2, which comprises a compound represented by the following formula (L), (wherein R ^L1 and R ^L2 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more of -CH ₂ - which are not adjacent to each other may be independently -CH= CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-substituted, OL represents 0, 1, 2 or 3, and B ^L1 , B ^L2 and B ^L3 are independently selected from (a) 1,4- cyclohexylene (in the presence of a group -CH ₂ - or not adjacent two or more of the -CH ₂ - may be substituted with -O-) and (b) 1, a group of 4-phenylene (a group of -CH= or 2 or more adjacent to the group -CH= may also be substituted with -N=), the group (a), The group (b) may be independently substituted by any one of a cyano group, a fluorine atom or a chlorine atom, and L ^L1 and L ^L2 each independently represent a single bond, -CH ₂ CH ₂ -, -(CH ₂ ) ₄ -, -OCH ₂ -, -CH ₂ O-, -COO-, -OCO-, -OCF ₂ -, -CF ₂ O-, -CH=NN=CH-, -CH=CH-, -CF=CF -or-C≡C-, when OL is 2 or 3 and L ^L2 is plural, the same or different, when OL is 2 or 3 and B ^L3 is plural, They may be the same or different, except for the compound represented by the formula (i). The liquid crystal composition according to any one of claims 1 to 3, which contains a compound represented by the following formula (XI-1), (wherein R ^X1 and R ^X2 independently of each other represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and are present in the groups One methylene group or two or more methylene groups which are not adjacent may be substituted with -O- or -S-, and one or two or more hydrogen atoms present in the groups may be Substituted as a fluorine atom or a chlorine atom). The liquid crystal composition according to any one of claims 1 to 4, which contains one or more compounds selected from the group consisting of compounds represented by the formula (XIII), (wherein R ^X1 and R ^X2 independently of each other represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and M ^X31 represents a selected from ( a) a trans-1,4-cyclohexylene group (one methylene group present in the group or two or more methylene groups not adjacent thereto may be substituted with -O- or -S-), and b) a group of a group consisting of 1,4-phenylene (a group of -CH= or a non-adjacent one or more -CH= may also be substituted into a nitrogen atom) in the group, the group The hydrogen atom contained in a) or in the group (b) may be substituted by a cyano group, a fluorine atom, a trifluoromethyl group, a trifluoromethoxy group or a chlorine atom, respectively. When a plurality of M ^X3 are present, such The same or different, W represents 0 or 1, X ³¹ ~ X ³⁶ represents a hydrogen atom or a fluorine atom, a combination of X ³¹ and X ³² , a combination of X ³³ and X ³⁴ , and at least 1 combination of X ³⁵ and X ³⁶ Each combination is a fluorine atom). The liquid crystal composition according to any one of claims 1 to 5, which contains a reactive monomer. A liquid crystal display element using the liquid crystal composition according to any one of claims 1 to 6. A liquid crystal display using the liquid crystal display element of claim 7 of the patent application.