JPH05257126A - Liquid crystal display film - Google Patents

Abstract

PURPOSE:To obtain a liquid crystal display film having a simple structure and excellent durability which can be driven at a low voltage by dispersing the drops of liquid crystal prepared by a phase separation method into a resin. CONSTITUTION:In the whole structure of the liquid crystal film, a liquid crystal film 30 consisting of a transparent resin dispersed with liquid crystal molecules is held by transparent conductive electrode layers 20, 20 provided on transparent base plates 10, 10 arranged facing to both sides therebetween. In such a case, the drops of liquid crystal are formed in the resin by a phase separation method and by using the scattering property of these drops, when voltage is applied between the transparent electrodes, the liquid crystal film is transparent. When no voltage is applied, the film is in an opaque state. The liquid crystal film has 1-2.5mum average diameter of liquid crystal drops and 5-50mum film thickness. The film shows such properties that the voltage V0.7 (V) in 70% transmitivity for parallel beams is <0.8d, the transmitivity T0 in no voltage is <=10% for d=10mum, and that the film satisfies specified conditions in the case of maintaining it at 70 deg.C for one hour and then gradually cooling it to a room temp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display film, and more specifically, it has a structure in which a liquid crystal film made of a transparent cured resin in which a liquid crystal phase is dispersed in the form of liquid crystal drops is sandwiched between two electrode layers. The present invention relates to a liquid crystal display film in which a liquid crystal layer can be changed to transparent or opaque in response to application of voltage to electrodes.

[0002]

2. Description of the Related Art In a liquid crystal film in which liquid crystal molecules are microencapsulated and then dispersed in a resin film as liquid crystal drops, opacity due to light scattering by the liquid crystal drops and liquid crystal drops due to application of an electric field A liquid crystal construct utilizing the transparency due to the orientation of the liquid crystal molecules inside has already been proposed by Ferguson et al. (US Pat. No. 4,435,047).
No.), some are in practical use. However,
This method is complicated in the production process because it includes a step of microencapsulation.

On the other hand, Kent University has a special table, Sho 61-502.
No. 128 and Japanese Patent Publication No. 63-501512, liquid crystal microdroplets are dispersed in a thermosetting resin permeable matrix by phase separation from a mixture of thermosetting resin and liquid crystal molecules to form a liquid crystal layer. Is proposing that. However, the method described in the publication does not provide a liquid crystal structure having a sufficient durability for use in a so-called dimming window, which is used for a window having a large area, for example, where sunlight is directly irradiated. Is the reality.

Further, the conventional liquid crystal structure requires an AC voltage of about 100 V to orient the liquid crystal, and has a serious drawback for display applications in that the power consumption is high. When used as a display element, there is a demand for a liquid crystal structure which can be driven at a low voltage in view of the design of its drive circuit and also for improving display image quality.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal structure which has a simple structure, excellent durability and can be driven at a low voltage.

[0006]

According to the present invention, a mixed solution of a polymer-forming monomer, a polymerization initiator, and a liquid crystal is sandwiched between transparent electrodes on two substrates, at least one of which is transparent. After that, by polymerizing and curing the polymer-forming monomer, liquid crystal droplets are formed in the resin by the phase separation method, and by utilizing the light scattering in the liquid crystal droplets, a transparent state is obtained when a voltage is applied between the transparent electrodes. Is a liquid crystal display film capable of taking an opaque state when no voltage is applied. More specifically, (a) the average droplet diameter R (μm) of the liquid crystal droplets is 1 to 2.5 μm.
and (b) the thickness d (μm) of the liquid crystal film is 5
˜50 μm, and (c) parallel light transmittance of 70
%, The applied voltage V _0.7 (v) is smaller than 0.8d, and (d) d = 10 μm, no voltage applied transmittance T ₀
Is 10% or less, and (e) when the display film is held at 70 ° C. for 1 hour and then gradually cooled to room temperature, the following formula is satisfied.

[0007]

[Equation 2]

A liquid crystal display film characterized in that

More specifically, the liquid crystal display film is characterized in that, in polymerizing and curing the polymer-forming monomer, it is pre-cured by thermal polymerization and then photo-cured by irradiation of ultraviolet rays.

The liquid crystal display film of the present invention requires that the incident light is scattered by the liquid crystal droplets dispersed in the polymer resin matrix, so that the liquid crystal droplet system must be larger than the wavelength of visible light, and Considering the scattering angle and the like at the resin / liquid crystal interface, the fact that the liquid crystal droplet size is too large also reduces the degree of scattering, so there is an optimum range for the liquid crystal droplet size.

Furthermore, when the present liquid crystal display film is used as a display, it may be driven at a low voltage so that it can be controlled by the current integrated circuit, that is, the applied voltage at which the parallel light transmittance is 70% is low. is necessary. In addition, the above conditions are significant only when the liquid crystal display film of the present invention has sufficient optical characteristics and excellent durability, and are the first to be achieved by the liquid crystal display film of the present invention.

Each component of the liquid crystal film of the present invention will be described.

The surface-active polymerizable monomer used in the present invention is a monomer obtained by substituting the terminal hydrogen group of a nonionic surfactant with an acrylate group and has the following general formula (I):

[0014]

[Chemical 3]

(In the formula, R ¹ represents a hydrogen atom or a methyl group,
R ² represents an alkylene group having 2 to 3 carbon atoms, R ³ represents a hydrophobic group, and n represents an integer of 2 to 12. ) (Meta)
It is an acrylic monomer.

Examples of R ₃ include alkyl, alkoxy, aryl and aryloxy. Of these, aryloxy is particularly preferable. In the general formula (I), particularly preferable one is the following general formula (III)

[0017]

[Chemical 4]

(In the formula, R ₆ is a hydrogen atom or a carbon number of 1 to 1.
The alkyl group of 0 shows m the integer of 2-12. ).

Phenoxyoligoethylene oxide acrylate monomer (hereinafter abbreviated as [EOA]) is preferably used.

Examples of the alkyl group having 1 to 10 carbon atoms represented by R ₆ include methyl group, ethyl group, propyl group, butyl group, pentyl group, nonyl group, isopropyl group, isobutyl group and isopentyl group. .. m is 1
~ 8 are more preferable. Incidentally, these may be a mixture.

Specific examples of the EOA represented by the general formula (I) are:

[0022]

[Chemical 5]

And the like.

As the hydrophilic polymerizable monomer containing a hydroxyl group in the chain which exerts the surfactant activity effectively used in the present invention, at least 1, preferably 1 to 5 hydroxyl groups and a radical polymerizable unsaturated group are used. Solubility Parameter (Poly. Eng. Sci., 14)
(2), p147, (1974)) is 11 to 13,
As a specific example, the following general formula (II)

[0025]

[Chemical 6]

(Wherein R ⁴ represents a hydrogen atom or a methyl group, and R ⁵ represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms). Sometimes referred to as "HOA") is preferably used.

Specific examples of the HOA represented by the general formula (II) are:

[0028]

[Chemical 7]

And corresponding methacrylates and the like. The mixing ratio of EOA and HOA is selected according to the liquid crystal used, but preferably EOA / HOA = 9.
It is selected in the range of 0/10 to 50/50.

The fluorine-based polymerizable monomer for matching the refractive index of the resin used in the present invention with the liquid crystal is represented by the following general formula (IV)

[0031]

[Chemical 8]

(In the formula, R ⁷ represents a hydrogen atom or a methyl group, and R ⁸ represents an alkyl group or a polyfluoroalkyl group having at least one fluorine atom. Here, the alkyl group preferably has 1 to 1 carbon atoms. 20.) Fluorine atom-containing (meth) acrylate represented by
Sometimes referred to as "A") is preferably used.

Specific examples of FA represented by the general formula (IV) include CH ₂ ═CHCOOCH ₂ —CF ₃ (2,2,2-trifluoroethyl acrylate) CH ₂ ═CHCOOCH ₂ — (CF ₂ ). ₂ H (2,2
3,3-tetrafluoroethane _{acrylate) CH 2 = CHCOOCH 2 - (} CF 2) 4 H (2,2,
3,3,4,4,5,5- oct Fluorochemicals pentyl _{acrylate) CH 2 = CHCOOCH 2 CH 2} - (CF 2) 7 CF 3
(Perfluorooctyl ethyl acrylate)

[0034]

[Chemical 9]

Examples thereof include methacrylylates corresponding to these.

The amount of the fluorine-based polymerizable monomer added is selected in consideration of the refractive index of the liquid crystal used. That is, the difference between the ordinary refractive index of the liquid crystal and the cured resin refractive index is selected to be within 0.1.

The polyfunctional polymerizable monomer used in the present invention for increasing the degree of cure is represented by the following general formula (V)

[0038]

[Chemical 10]

(In the formula, R ⁹ represents a hydrogen atom or a methyl group, R ¹⁰ and R ¹¹ represent a hydrogen atom or a lower alkyl group having 1 to 3 carbon atoms, n represents 2 to 6, and X represents N, O. , S, may contain 1 to 15 halogen atoms, and represents a residue having 1 to 40 carbon atoms, which is an alkyl, aralkyl, aryl, cycloalkyl, heteroaromatic ring or heterocyclic ring). (Meth) acrylate is preferably used.

Specific examples of the polyfunctional (meth) acrylate represented by the general formula (V) include:

[0041]

[Chemical 11]

And the like.

The amount of the polyfunctional polymerizable monomer to be used is usually 0.1% with respect to the total amount of the polymer-forming monomer (mixed liquid).
About 1 to 5% by weight is desirable.

When no polyfunctional polymerizable monomer is used, the resin has a very low glass transition point and the liquid crystal component dissolved in the resin even after phase separation makes the resin very soft and durable of the liquid crystal composition. Can cause problems. Further, when the polyfunctional polymerizable monomer is mixed in an amount of 5% by weight or more, the degree of resin curing increases, and at the same time, the characteristics of the liquid crystal constituent, such as low voltage driving characteristics, are likely to be significantly deteriorated.

In order to prepare a liquid crystal composition having high durability without impairing the original characteristics, the mixing amount of the polyfunctional polymerizable monomer is 0.1 to 5% by weight.
It is preferable that

Further, the addition of the polyfunctional polymerizable monomer makes it possible to reduce the transmittance when no voltage is applied, and the effect of improving the light shielding property can be obtained.

To obtain the effect of improving the light-shielding property, the amount of the polyfunctional polymerizable monomer added is more preferably 0.5 to 2% by weight.

[0048] In order to cure the acrylate-based polymer-forming monomer mixture of EOA, HOA, FA and polyfunctional (meth) acrylate, after pre-curing by thermal polymerization, it is irradiated with actinic rays such as ultraviolet rays to be cured. ..

An organic peroxide is used as the thermal polymerization initiator. Since the thermal polymerization temperature is preferably equal to or higher than the liquid crystal phase transition temperature, the decomposition half-life of the organic peroxide is 10 at the liquid crystal phase transition temperature. Those below the time are selected. Specifically, peroxyester (Perbutyl P of NOF CORPORATION)
V) and diacyl peroxyside (Perloyl D manufactured by NOF CORPORATION). On the other hand, a conventionally known compound can be used as it is as an initiator for initiating curing by ultraviolet irradiation, and for example, an acetophenone structure or a thioxanthone structure is used, and acetophenone, benzophenone, benzyl, benzoin, benzoin alkyl ether, xanthone and a nucleus thereof. Substituted compounds are used.

Further, hydroxyacetophenone (Darocur 1173) and α-amino-acetophenone (Irgacure 907) are preferable examples.

Of course, the present invention is not limited to this, and a sensitizer, a chain transfer agent, a dye and the like can be added.

The thermal polymerization initiator and the photopolymerization initiator can be mixed and added to the polymer-forming monomer mixed solution, and the addition amount thereof is 0.1 to 5 with respect to the total amount of the polymer monomer mixed solution. About wt% is desirable, and the ratio of the thermal polymerization initiator to the photopolymerization initiator is 10:70 to 9 in consideration of the curing time.
It is selected between 0 and 10.

Since the liquid crystal structure causes an opaque state to appear due to the scattering of light by the minute liquid crystal phase dispersed in the resin and the random blending of liquid crystal molecules, the average size of the liquid crystal droplets is larger than the wavelength of visible light. It is preferable to have an average diameter of 0.8 μm or more, and in order to obtain opacity due to the randomness of liquid crystal molecules, the larger the difference in refractive index between the ordinary light refractive index and the extraordinary light refractive index, the better. In order to promote liquid crystal alignment at a lower voltage, it is better that the positive dielectric constant anisotropy of the liquid crystal is larger. In consideration of this point, the liquid crystal component forming the liquid crystal layer is a cyanobiphenyl-based liquid crystal having a high positive dielectric anisotropy and a difference in refractive index between the ordinary light refractive index and the extraordinary light refractive index of 0.2 or more. A liquid crystal component is preferably used. Of course, the liquid crystal is not limited to this, and phenylcyclohexane-based liquid crystal or the like is selected according to the application.

The liquid crystal droplets described in this patent include not only isolated liquid crystal droplets but also a case where some liquid crystal droplets are connected and liquid crystal molecules form a continuous phase.

In general, even a liquid crystal film formed by appropriately mixing resin and liquid crystal and coating it can show some optical change depending on the presence or absence of voltage application. However, good ON-OFF
The characteristic, that is, the transmittance is high when a voltage is applied.
In order to obtain a liquid crystal structure having a transmittance of 70% or more when V is applied and a small transmittance when no voltage is applied, for example, a transmittance of 10% or less, an optimal combination of liquid crystal and resin is used. is necessary.

The transmittance described here is a value obtained by measuring the amount of light incident on a photodiode having a diameter of 3 mm fixed 30 mm rearward from the surface of the liquid crystal structure when using a He—Ne laser as a light source.

The cyanobiphenyl liquid crystal phase dispersed in the acrylate resin of the present invention is represented by the general formula (VI)

[0058]

[Chemical 12]

The cyanobiphenyl liquid crystal represented by the formula (wherein Y represents an alkyl or alkoxy group having 1 to 12 carbon atoms) is most suitable. You may use these compounds in combination of 2 or more types.

As this liquid crystal, for example, E manufactured by Merck & Co., Inc.
-8 Liquid crystals can be mentioned.

The cyanobiphenyl type liquid crystal phase in the liquid crystal film of the present invention is prepared by mixing cyanobiphenyl type liquid crystal in a polymer monomer mixture liquid so that the liquid crystal component content is preferably 50% by weight or more and 75% by weight or less. By using as a coating liquid,
It can be obtained as a liquid crystal phase having an average diameter of 0.8 μm or more.

When the liquid crystal component is less than 50% by weight, the liquid crystal molecules dissolved in the monofunctional acrylate resin have small liquid crystal droplets due to phase separation during curing, and have a low density.
Therefore, there is a drawback that good opacity, that is, light shielding property cannot be obtained.

On the other hand, when it exceeds 75% by weight, the liquid crystal component cannot be completely dissolved and a liquid crystal domain is formed from the time of mixing,
The liquid crystal component, which cannot be contained in the resin due to curing, oozes out. As a result, inconveniences such as a decrease in light-shielding property, a decrease in adhesiveness with a transparent conductive substrate, a decrease in workability, etc. are caused because fine droplets of a liquid crystal phase are not formed and light scattering is not sufficiently caused.

As described above, in order to form a liquid crystal film having good light-shielding property, workability and durability, the liquid crystal component is preferably 50% by weight or more and 75% by weight or less. In order to obtain a more preferable light shielding property, the liquid crystal component is 65 to 75% by weight.

Next, the liquid crystal display film of the present invention will be described.

The overall structure of the liquid crystal display film of the present invention is, as shown in FIG. 1, a (transparent) substrate 1 which is relatively arranged on both sides.
Liquid crystal films 30 made of (transparent) resin in which liquid crystal molecules are dispersed are sandwiched between (transparent) conductive electrode layers 20 and 20 provided on 0 and 10, respectively.

As the (transparent) substrate 10 of the present invention, a polyester film having excellent transparency is preferably used, but it is also possible to use a glass plate or another transparent polymer film.

Further, it is provided on the substrate 10 (transparent).
The conductive electrode layer 20 is preferably an indium oxide film of indium which may contain a small amount of impurities such as tin, but a metal oxide film of zinc oxide, titanium oxide or the like;
A thin film of a metal such as gold or platinum; a laminate in which a thin metal film is sandwiched by transparent conductor films can also be used.

An opaque film having a high reflectance may be formed by forming one of the electrode layers as a thick metal film.
In this case, the substrate 10 does not have to be transparent.

The electrode layer is formed on the transparent substrate 10 by a known physical method, for example, a sputtering method or the like at 500Ω / □.
It can be provided as the transparent conductive electrode layer 20 having the following resistance, preferably 300 Ω / □ or less.

In the liquid crystal display film of the present invention, the transparent conductive electrode layer 20 is provided on the transparent substrate 10 by a known method such as sputtering, and a mixed liquid of a polymer-forming monomer mixed liquid and a cyanobiphenyl liquid crystal is formed. (Coating liquid) is applied on the transparent conductive electrode layer 20 with a bar coater to a uniform thickness, and then another transparent substrate 1 with the transparent conductive electrode layer 20 is applied.
0 is laminated so that the transparent conductive electrode layer 20 is in contact with the liquid crystal layer 30 to obtain a laminated body, and then a temperature higher than the phase transition temperature of the liquid crystal used (for example, E-8 is 72 ° C.).
Pre-cure at 90 ° C.). After that, after cooling the sample to room temperature, the laminated body can be irradiated with ultraviolet rays under an ultraviolet ray irradiation device using a mercury lamp as a light source to cure the polymer monomer, and thus it can be produced.

In order to apply the coating liquid to a uniform thickness,
Printing methods other than the bar coater method are also used.

The liquid crystal film 30 cured by heat and ultraviolet rays is
A transparent conductive electrode layer 20 having a thickness of 5 to 50 μm
The thickness is selected depending on the balance between the opacity of the liquid crystal film when no voltage is applied to it and the transparency when a voltage is applied. Preferably, a thickness of 10-20 μm is used.

The liquid crystal display film thus obtained is easy to manufacture and is excellent in ON-OF, for example, a film having a thickness of 10 μm.
F characteristic, that is, the transparency at the time of applying 8V is 70% or more and the transparency at the time of not applying the voltage is 10% or less, the difference between transparent and opaque is large, and it can be driven at a low voltage.
It can be suitably used as a display element. Further, the degree of curing of the polymer resin is improved by the two-step curing of heat and ultraviolet rays, and a display film having excellent durability can be obtained.

[0075]

The present invention will be described in more detail with reference to the following examples.

[0076]

Example 1 A 125 μm-thick polyester film was used as a transparent substrate, and an indium oxide film containing a small amount of tin as a transparent conductive layer was deposited thereon by a sputtering method to a thickness of about 200 Å.

As the cyanobiphaenyl liquid crystal, E-8 manufactured by Merck was used, and as EOA, M113 (nonylphenoxyethylene oxide acrylate) manufactured by Toagosei Co., Ltd. was used. As the HOA, HOP-A (2-hydroxypropyl acrylate) manufactured by Kyoeisha Yushi Kagaku Kogyo Co., Ltd. was used. As FA, viscoat 8-F (octafluoropentyl acrylate) manufactured by Osaka Organic Chemical Industry was used. As a polyfunctional polymerizable monomer, PE-4A (pentaerythritol 4 manufactured by Kyoeisha Yushi Kagaku Kogyo Co., Ltd.)
-Acrylate) was used. These monomers are mixed in a weight mixing ratio of M113: HOP-A: 8-F: PE-4A =
Mixed at a ratio of 64: 16: 20: 1. Peroxyester (perbutyl PV) of NOF CORPORATION was used as a heat curing initiator, and 0.5% by weight of Irgacure 907 manufactured by Ciba-Geigy Co., Ltd. was added and mixed as an ultraviolet curing initiator.
Micropearl 210 (10 μm diameter) manufactured by Sekisui Fine Chemical Co., Ltd. was used as a spacer in the mixed solution.
3% by weight was added, and the mixture was further mixed so that the liquid crystal component was 67% by weight, stirred well, and deaerated to obtain a coating liquid.

Next, the coating liquid was applied onto the transparent conductive layer using a # 20 bar coater. Next, another polyester film with a transparent conductive layer was laminated so that the transparent conductive layer was in contact with the liquid crystal coating film, and then heat-cured in a high temperature atmosphere of 90 ° C. for about 10 minutes. After the film was cooled to room temperature, it was irradiated with 4 mW / cm ² of ultraviolet light for about 5 minutes using an ultraviolet irradiation device using a mercury lamp as a light source. The liquid crystal coating layer is cured between the transparent conductive layers by ultraviolet light,
A μm liquid crystal film was formed to form a liquid crystal display film.

An OV was applied between the two electrodes of the obtained liquid crystal display film.
From the liquid crystal display film surface when a He-Ne laser is used as a light source by applying a voltage of 20 V from
The amount of light that reaches a photodiode fixed to the rear and having a diameter of 3 mm is graphed. Then, the transmittance at OV was set as the light-shielding property T ₀ , and the voltage at which the parallel light transmittance reached 70% was set as the drive voltage V _{0.7, which} was the characteristic of the liquid crystal display film.

The liquid crystal display film was allowed to stand in a hot air dryer at 70 ° C. for 100 hours and then slowly cooled to room temperature over 4 hours, and the change with time in the characteristics of T ₀ and V _0.7 was measured at room temperature. This made it a durability test. Table 1 shows the values obtained for T ₀ , T _0.7 , T ₀ ′ and V _0.7 ′ before and after the durability test.

[0081]

[Comparative Examples 1 and 2] Initial characteristics of the liquid crystal display film having the composition used in Example 1 and cured only by heat curing for 15 minutes, and the display film formed by simultaneously performing heat curing and ultraviolet curing for 10 minutes. The results of durability and durability are also shown in Table 1.

[0082]

[Table 1]

As is clear from Table 1, the liquid crystal display film of the present invention has durability T ₀ ′ / T ₀ = 1.17, V _0.7 ′ / V.
It is as good as _0.7 = 1.0, and the improvement of the light-shielding property in the initial characteristics (reduction of T ₀ ) is also observed.

[0084]

Example 2 and Comparative Example 3 The liquid crystal display film prepared in the same manner as in Example 1 was washed with ethanol to extract the low polymer which is soluble in ethanol together with the liquid crystal. At this time, the weight ratio of the dissolved low polymer component to the resin was about 1 based on the weight measurement.
It was 5 wt%. On the other hand, in the same manner as in Comparative Example 1, in the liquid crystal display film cured only by thermal polymerization, about 38 wt% was a low polymer component soluble in ethanol. As described above, it is clear that the liquid crystal display film of the present invention has a high degree of curing.

[0085]

INDUSTRIAL APPLICABILITY The present invention is a liquid crystal display film which can be easily manufactured, has excellent durability, and can be driven at a low voltage, and can be widely used as a liquid crystal shutter, a light control material or a display material.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a liquid crystal display film of the present invention.

[Explanation of symbols]

 10 Transparent Substrate 20 Transparent Conductive Electrode Layer 30 Liquid Crystal Film

Claims (10)

[Claims] 1. A polymer-forming monomer, a polymerization initiator, and a liquid crystal of three members are sandwiched between transparent electrodes on two substrates, at least one of which is transparent, and then the polymer-forming monomer is polymerized and cured. The liquid crystal droplets are formed in the resin by the phase separation method by using the above method.By utilizing the light scattering in the liquid crystal droplets, the transparent state is obtained when a voltage is applied between the transparent electrodes, and the opaque state is obtained when no voltage is applied. In the liquid crystal display film capable of achieving the following, (a) the average droplet diameter R (μm) of the liquid crystal droplets is in the range of 1 to 2.5 μm, and (b) the thickness d (μm) of the liquid crystal film is 5 In the range of 50 μm, (c) Applied voltage V when parallel light transmittance is 70%
_0.7 (v) is smaller than 0.8d, and (d) d = 10 μm has a transmittance T ₀ of 10 when no voltage is applied.
% Or less, and (e) the display film is held at 70 ° C. for 1 hour and then gradually cooled to room temperature, the following formula is satisfied: A liquid crystal display film characterized by the above. 2. The polymerization-curing of the polymer-forming monomer containing the liquid crystal is performed by a two-step curing method of pre-curing by thermal polymerization and then photo-curing by UV irradiation. The liquid crystal display film described. 3. An organic peroxide is used as a thermal polymerization initiator and an acetophenone-type or thioxanthone-type initiator is used as a photopolymerization initiator for separately initiating the thermal polymerization and the photopolymerization. 2. The liquid crystal display film according to 2. 4. The liquid crystal display film according to claim 1, wherein the thermal polymerization is carried out at a liquid crystal phase transition temperature or higher, and the half-life time of the polymerization initiator at that time is 5 hours or less. 5. The polymer-forming monomer forms a liquid crystal having a molecular weight of 0.
A polymerizable monomer having a surface-active ability to effect phase separation with a uniform diameter of 8 to 5 μm, a hydrophilic polymerizable monomer, and a fluorine-based polymerizable monomer for matching the refractive index of the resin with the liquid crystal, The liquid crystal display film according to claim 1, wherein the liquid crystal display film is a solution in which an appropriate amount of a polyfunctional polymerizable monomer for increasing the resin curing degree is mixed. 6. The resin of the liquid crystal display film contains 2 to 20% by weight of fluorine atoms.
The liquid crystal display film described. 7. The liquid crystal display film according to claim 1, wherein the polymerizable monomer having surface-active property is a (meth) acrylate-based monomer represented by the general formula (I). [Chemical 1] (In the formula, R ₁ is a hydrogen atom or a methyl group, R ₂ is an alkylene group having 2 to 3 carbon atoms, R ₃ is a hydrophobic group, and n is 2 to
Indicates an integer of 12. ) 8. The liquid crystal display film according to claim 1, wherein the hydrophilic polymerizable monomer is a (meth) acrylic monomer represented by the general formula (II). [Chemical 2] (In the formula, R ₄ represents a hydrogen atom or a methyl group, and R ₅ represents a hydrogen atom or an alkyl chain having 1 to 2 carbon atoms.) 9. The fluorine-based polymerizable monomer is a (meth) acrylate-based monomer having optical characteristics in which the refractive index of a cured product when homopolymerized is in the range of 1.30 to 1.45. The liquid crystal display film according to claim 1. 10. The number of acrylic groups in a unit monomer is 2 as a polyfunctional monomer for increasing the degree of resin curing.
10. The liquid crystal display film according to claim 1, wherein the polyfunctional acrylate of .about.4 is added in the range of 0.1 to 5% by weight of the polymer monomer mixed liquid.