A polymerizable composition, a liquid crystal curable film and its preparation method, and a display device.

Abstract

This invention belongs to the field of optical thin film technology, specifically relating to a polymerizable composition, a liquid crystal curable film comprising the composition, a preparation method thereof, and its application in display devices. By using this polymerizable composition, a vertically oriented liquid crystal curable film can be obtained without the use of a PI alignment film, which can effectively improve production efficiency and save production costs. Furthermore, the vertically oriented liquid crystal curable film comprising this composition has a large Rth adjustment range and very low haze.

Description

Technical Field

[0001] This invention relates to the field of optical thin film technology. More specifically, it relates to a polymerizable composition, a liquid crystal curable film comprising the composition, a method for preparing the composition, and its application in display devices. Background Technology

[0002] An elliptical polarizer is an optical component consisting of a polarizing plate and a retardation plate stacked together. For example, in devices that display images in a planar state, such as organic EL image display devices, it is used to prevent light reflection at the electrodes constituting the device. As the retardation film layer constituting the elliptical polarizer, a so-called λ / 4 waveplate is typically used. A single-layer λ / 4 waveplate can only achieve a black state display effect at a straight viewing angle; light leakage still occurs at oblique viewing angles. By further assembling a vertically aligned liquid crystal curing film into an elliptical polarizer having a horizontally aligned liquid crystal curing film, oblique hue changes during black state display when the elliptical polarizer is used in an organic EL display device can be suppressed.

[0003] Traditionally, manufacturing vertically aligned liquid crystal curable films typically requires a vertically aligned film used to align the polymeric liquid crystal compound vertically. To obtain the coating from both the alignment film forming composition and the liquid crystal curable film forming composition, at least two coating formation steps are required, leading to reduced productivity. Furthermore, conventional vertically aligned films require a polyimide (PI) layer to induce the desired vertical alignment of the liquid crystal layer. Besides significantly increasing costs, the interaction between PI and the vertically aligned liquid crystal curable film often negatively impacts black-state transmittance. Therefore, it is desirable to provide the required uniform vertical alignment without using PI.

[0004] Therefore, in order to improve production efficiency and reduce production costs, how to provide a liquid crystal curing film that can provide the required vertical orientation without using PI is an urgent problem to be solved in the field of optical film technology. Summary of the Invention

[0005] To address one or more of the aforementioned technical deficiencies, the present invention provides a polymerizable composition that allows for the preparation of a vertically oriented liquid crystal curing film without the need for a PI-oriented film, thereby effectively improving production efficiency and saving production costs. Furthermore, the vertically oriented liquid crystal curing film contains a wide Rth adjustment range and very low haze.

[0006] In order to achieve the above-mentioned beneficial technical effects, the present invention provides a polymerizable composition comprising one or more compounds of Formula I and one or more compounds of Formula II, and further comprising one or more compounds of Formula III as additives;

[0007]

[0008]

[0009] In Formula I, L1 represents H, F, Cl, CN, or a straight-chain, branched, or cyclic alkyl group having 1 to 25 carbon atoms, an alkenyl group having 2 to 25 carbon atoms, or an alkynyl group having 2 to 25 carbon atoms, wherein one or more non-adjacent -CH2- groups are optionally substituted with -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, or -N-, and the -O- or -S- atoms in the substituted groups are not directly connected to each other, wherein one or more H atoms in one or more -CH2- groups are each optionally substituted with a halogen;

[0010] It represents 1,4-cyclohexylene, 1,4-phenylene, 2,6-naphthylene, 1,5-naphthylene, or 1,4-naphthylene;

[0011] Sp1 and Sp2 each independently represent spacer groups; P1 and P2 each independently represent polymerizable groups or H, and at least one of P1 and P2 represents a polymerizable group; a, b, and c each independently represent 1, 2, or 3;

[0012] In formula II, S 11 Indicates a polymerizable group; I 11 Indicates a spacer base or single bond; H 11 Indicates alkyl, alkoxy, thioalkyl, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyl, or alkoxycarbonyloxy groups having 1 to 10 carbon atoms; M 11 It is F, Cl, CN, NO2, OCN, SCN, fluoroalkyl groups with 1 to 10 carbon atoms, or fluoroalkoxy groups with 1 to 10 carbon atoms;

[0013] In Formula III, X1 and X3 independently represent H, F, Cl, CN, OCN, CHO, COOH, and NO2; X2 represents a single bond, -CH=CH-, -C≡C-, or a cyclic group; m, n, and q independently represent integers from 0 to 10.

[0014] The polymerizable composition contains 30% to 70% by mass of the compound represented by Formula I, and 40% to 70% by mass of the compound represented by Formula II; the compound represented by Formula III is added in an amount of 0.5% to 2.5% by mass relative to the polymerizable composition.

[0015] A second objective of the present invention is to provide a liquid crystal curing film, which is polymerized from the aforementioned polymerizable composition.

[0016] A third objective of this invention is to provide a method for preparing a liquid crystal curable film, which is the aforementioned method for preparing a liquid crystal curable film.

[0017] A fourth object of the present invention is to provide a display device comprising the aforementioned polymerizable composition or the aforementioned liquid crystal curable film.

[0018] Invention Effects

[0019] This invention provides a polymerizable composition that allows for the preparation of vertically oriented liquid crystal cured films without the need for PI alignment films, effectively improving production efficiency and reducing production costs. Furthermore, the vertically oriented liquid crystal cured films formed by this polymerizable composition exhibit a wide Rth adjustment range and very low haze. The liquid crystal cured film preparation method provided by this invention is simple and easy to implement, effectively improving production efficiency and reducing production costs, and enabling large-scale production. The display device provided by this invention, comprising the liquid crystal cured film formed by the above-mentioned polymerizable composition, exhibits excellent display performance. Detailed Implementation

[0020] The term "additives" as used in this invention refers to components that improve the stability of the polymerizable compositions of this invention, including antioxidants, photoinitiators, leveling agents, surfactants, chain transfer agents, sensitizers, UV stabilizers, polymerization inhibitors, etc. These additives can be selectively added, either one or more, or omitted, depending on the stability performance of the formulation.

[0021] Antioxidants: To improve the stability of the polymerizable composition of the present invention, antioxidants are preferably added. Examples of such compounds include hydroquinone derivatives, nitrosamine polymerization inhibitors, hindered phenolic antioxidants, etc. More specifically, examples include tert-butylhydroquinone, methylhydroquinone, "Q-1300" and "Q-1301" manufactured by Wako Pure Chemical Industries, Ltd., and "IRGANOX1010", "IRGANOX1035", "IRGANOX1076", "IRGANOX1098", "IRGANOX1135", "IRGANOX1330", "IRGANOX1425", "IRGANOX1520", "IRGANOX1726", "IRGANOX245", "IRGANOX259", "IRGANOX3114", "IRGANOX3790", "IRGANOX5057", and "IRGANOX565" manufactured by BASF.

[0022] Photoinitiators refer to photopolymerization initiators, preferably containing at least one type. Specifically, examples include: BASF Japan's "Irgacure 651", "Irgacure 184", "Darocur 1173", "Irgacure 907", "Irgacure 127", "Irgacure 369", "Irgacure 379", "Irgacure 819", "Irgacure 2959", "Irgacure 1800", "Irgacure 250", "Irgacure 754", "Irgacure 784", "Irgacure OXE01", "Irgacure OXE02", "Lucirin TPO", "Darocur 1173", and "Darocur MBF", etc.

[0023] Leveling agent: In order to reduce film thickness unevenness, the polymerizable composition of the present invention may contain at least one surfactant. Examples of surfactants that may be contained include: alkyl carboxylates, alkyl phosphates, alkyl sulfonates, fluoroalkyl carboxylates, fluoroalkyl phosphates, fluoroalkyl sulfonates, polyoxyethylene derivatives, fluoroalkyl ethylene oxide derivatives, polyethylene glycol derivatives, alkyl ammonium salts, fluoroalkyl ammonium salts, etc., with fluorinated surfactants being particularly preferred. Specifically, "Megafac F-251", "Megafac F-444", "Megafac F-477", "Megafac F-510", "Megafac F-552", "Megafac F-553", "Megafac F-554", "Megafac F-555", "Megafac F-556", "Megafac F-557", "Megafac F-558", "Megafac F-559", "Megafac F-560", "MegafacF-561", "Megafac F-562", "Megafac F-563", "MegafacF-565", "Megafac F-567", "Megafac F-568", "Megafac F-569", "Megafac F-570", "Megafac F-571", "MegafacR-40", "Megafac The following are products manufactured by DIC Corporation: R-41, Megafac R-43, Megafac R-94, Megafac RS-72-K, Megafac RS-75, Megafac RS-76-E, and Megafac RS-90.

[0024] Chain transfer agent: To improve the adhesion to the substrate, the polymerizable composition of the present invention preferably contains a chain transfer agent. As a chain transfer agent, thiol compounds are preferred, and monothiols, dithiols, trithiols, and tetrathiols are more preferred.

[0025] Polymerization inhibitors include: phenolic compounds, quinone compounds, amine compounds, thioether compounds, nitroso compounds, etc.

[0026] In this invention, "coating" refers to a coating method used to obtain the polymerizable composition of this invention, and can be any known and conventional method such as coater coating, rod coating, spin coating, roller coating, direct gravure coating, reverse gravure coating, flexo coating, inkjet coating, die coating, cap coating, dip coating, slot coating, etc. After coating the polymerizable composition, it is dried as needed.

[0027] The term "polymerization" as used in this invention refers to the polymerization operation of the polymerizable composition of this invention. When polymerization is carried out by light irradiation, it is preferred to irradiate with ultraviolet light with a wavelength of 390 nm or less, and most preferably with light with a wavelength of 250 to 370 nm.

[0028] In this invention, “Re” refers to the intra-film delay, that is, the horizontal delay, which is the delay parallel to the surface of the phase difference film.

[0029] In this invention, "Rth" refers to the vertical delay, that is, the delay perpendicular to the surface of the phase difference film.

[0030] The term "room temperature" as used in this invention refers to a temperature range of 15°C to 35°C.

[0031] In this invention, "spacer group" refers to an alkyl group having 1-10 carbon atoms, a fluorinated alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, a fluorinated alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, a fluorinated alkenyl group having 2-10 carbon atoms, an alkenyl group having 3-8 carbon atoms, or a fluorinated alkenyl group having 3-8 carbon atoms, an alkyne group having 2-10 carbon atoms, a fluorinated alkyne group having 2-10 carbon atoms, an alkyne group having 2-8 carbon atoms, or a fluorinated alkyne group having 3-8 carbon atoms. Furthermore, any one or more unconnected -CH2- groups in the spacer group may be independently and optionally substituted with -O-, -S-, -COO-, or -OOC-.

[0032] In this invention, "polymerizable group" refers to methacrylate, acrylate, vinyl, or ethylene oxide groups. Acrylate or methacrylate groups are further preferred.

[0033] [Polymerizable Composition]

[0034] The present invention provides a polymerizable composition comprising one or more compounds of Formula I and one or more compounds of Formula II, and further comprising one or more compounds of Formula III as additives;

[0035]

[0036] In Formula I, L1 represents H, F, Cl, CN, or a straight-chain, branched, or cyclic alkyl group having 1 to 25 carbon atoms, an alkenyl group having 2 to 25 carbon atoms, or an alkynyl group having 2 to 25 carbon atoms, wherein one or more non-adjacent -CH2- groups are optionally substituted with -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, or -N-, and the -O- or -S- atoms in the substituted groups are not directly connected to each other, wherein one or more H atoms in one or more -CH2- groups are each optionally substituted with a halogen;

[0037] It represents 1,4-cyclohexylene, 1,4-phenylene, 2,6-naphthylene, 1,5-naphthylene, or 1,4-naphthylene;

[0038] Sp1 and Sp2 each independently represent spacer groups; P1 and P2 each independently represent polymerizable groups or H, and at least one of P1 and P2 represents a polymerizable group; a, b, and c each independently represent 1, 2, or 3;

[0039] In formula II, S 11 Indicates a polymerizable group; I 11 Indicates a spacer base or single bond; H 11 Indicates alkyl, alkoxy, thioalkyl, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyl, or alkoxycarbonyloxy groups having 1 to 10 carbon atoms; M 11 It is F, Cl, CN, NO2, OCN, SCN, fluoroalkyl groups with 1 to 10 carbon atoms, or fluoroalkoxy groups with 1 to 10 carbon atoms;

[0040] In Formula III, X1 and X3 independently represent H, F, Cl, CN, OCN, CHO, COOH, and NO2; X2 represents a single bond, -CH=CH-, -C≡C-, or a cyclic group; m, n, and q independently represent integers from 0 to 10.

[0041] The polymerizable composition contains 30% to 70% by mass of the compound represented by Formula I, and 40% to 70% by mass of the compound represented by Formula II; the compound represented by Formula III is added in an amount of 0.5% to 2.5% by mass relative to the polymerizable composition.

[0042] The polymerizable composition of the present invention, preferably, in Formula II, M 11 It represents CN.

[0043] In the polymerizable composition of the present invention, preferably, in Formula III, X1 represents CHO, X3 represents H, and the cyclic group represented by X2 is a cycloalkyl group with 3 to 8 carbon atoms or an aryl group with 6 to 15 carbon atoms.

[0044] The polymerizable composition of the present invention preferably further comprises one or more additives, said additives including antioxidants, photoinitiators, leveling agents, surfactants, chain transfer agents, sensitizers, UV stabilizers, or polymerization inhibitors.

[0045] Preferably, the compound represented by Formula I is selected from the group consisting of compounds represented by Formulas I1-I20.

[0046]

[0047]

[0048]

[0049] Wherein, t and u independently represent 1, 2, 3, 4, 5, 6, 7, or 8. Based on the solubility and compatibility of the above compounds, as well as safety standards, compounds shown in Formulas I4–8, I10–12, I14–15, and I18–20 are preferred.

[0050] More preferably, the compound represented by Formula I is selected from the group consisting of compounds represented by Formulas I4-1 to I20-3.

[0051]

[0052]

[0053]

[0054]

[0055]

[0056] More preferably, the compound shown in Formula I is selected from the compounds shown in Formula I 4-3, Formula I 6-2, Formula I 6-3, Formula I 7-2, Formula I 7-3, Formula I 11-2, Formula I 11-3, Formula I 14-2, Formula I 14-3, Formula I 18-2, Formula I 18-3, and Formula I 20-1.

[0057] Preferably, the compound represented by formula II is selected from the group consisting of compounds represented by formulas II1-II5.

[0058]

[0059] Preferably, the compound represented by formula III is selected from the group consisting of compounds represented by formulas III1-III5.

[0060]

[0061]

[0062] [Liquid crystal cured film]

[0063] A second objective of the present invention is to provide a liquid crystal curable film polymerized from the aforementioned polymerizable composition.

[0064] Preferably, the aforementioned liquid crystal curing film is a vertically oriented liquid crystal curing film.

[0065] Preferably, the Rth of the aforementioned liquid crystal curing film is between 50 nm and 500 nm.

[0066] Preferably, the thickness of the aforementioned liquid crystal curing film is 1 μm to 5 μm.

[0067] [Preparation method of liquid crystal cured film]

[0068] The third objective of this invention is to provide a method for preparing a liquid crystal curable film, as detailed below:

[0069] The first step is to dissolve the above-mentioned polymerizable composition in a solvent to form a polymerizable composition solution;

[0070] The second step is to coat the polymerizable composition solution onto a corona-treated substrate film to form a polymerizable composition solution layer.

[0071] The third step is to place the substrate film, which forms the polymerizable composition solution layer, on a hot plate for heating.

[0072] The fourth step involves subjecting the heated substrate film to ultraviolet irradiation to form a liquid crystal curing film.

[0073] Preferably, the aforementioned coating is performed using a wire bar coater.

[0074] Preferably, the solvent is a mixture of butanone and toluene in a weight ratio of 1:2.

[0075] Preferably, the heating temperature of the aforementioned heating platform is 90°C and the heating time is 90 seconds.

[0076] Preferably, the aforementioned ultraviolet irradiation is performed at 80°C using 365nm ultraviolet light, with a cumulative light intensity ≥500mJ / cm². 2 .

[0077] [Display Devices]

[0078] A fourth object of the present invention is to provide a display device comprising the aforementioned polymerizable composition or the aforementioned liquid crystal curable film.

[0079] Example

[0080] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0081] In this invention, the preparation methods are all conventional unless otherwise specified, and the raw materials used can be obtained from publicly available commercial sources unless otherwise specified. The temperature is in degrees Celsius (°C). The specific meanings of other symbols and test conditions are as follows:

[0082] The thickness was measured using an elliptic polarimeter. The thickness of the vertically oriented liquid crystal cured film was measured using an M 220 manufactured by Nippon Spectrophotometer Co., Ltd.

[0083] The retardation of the liquid crystal curing film was measured by bonding the glass with 25μm OCA optical adhesive manufactured by SDK Corporation, and then peeling the vertically aligned liquid crystal of the vertically aligned liquid crystal curing film laminate obtained above from the base film. The horizontal and vertical phase differences of the vertically aligned liquid crystal curing film were measured using an Optipro device from Shin-Etsu Chemical Co., Ltd. of Japan for the resulting laminate containing glass, OCA optical adhesive and vertically aligned liquid crystal curing film.

[0084] The surface condition evaluation method involves measuring the haze of the optical anisotropic layer using a haze meter (Toyo Seiki Co., Ltd.'s "haze-gard II") on the aforementioned laminate containing glass, OCA optical adhesive, and a vertically aligned liquid crystal curing film. As a result, a haze less than 0.5% is considered "good," a haze between 0.5% and 1% is considered "slightly cloudy," and a haze greater than 1% is considered "cloudy." Furthermore, the surface condition of the optical anisotropic layer is visually observed under fluorescent light; the absence of film shrinkage wrinkles and haze is considered "good," while any observed signs are considered "poor."

[0085] As a preferred embodiment, the compounds shown in Formula I, Formula II, and Formula III are preferably the compounds shown in the following formulas.

[0086]

[0087] The preferred leveling agent is Megafac F-556, manufactured by DIC Corporation; the preferred photoinitiator is Irgacure 369, manufactured by BASF Corporation; and the preferred antioxidant is IRGANOX 1076, manufactured by BASF Corporation.

[0088] The present invention will be described below using specific embodiments:

[0089] Example

[0090] Example 1

[0091] Prepare polymerizable composition solutions and liquid crystal curable films according to the compositions and parts by mass in Table 1 below.

[0092] The preparation method of the polymerizable composition solution is as follows:

[0093] Formula I19-3 and Formula II1 were mixed at a mass ratio of 40:60 to obtain a mixture. Relative to 100 parts by mass of the obtained mixture, 1.5 parts by mass of Formula III1, 0.5 parts by mass of the leveling agent Megafac F-556, 4 parts by mass of the photoinitiator Irgacure 369, and 0.7 parts by mass of the antioxidant IRGANOX 1076 were added. A mixed solvent of methyl ethyl ketone (MEK) and toluene (MEK:toluene = 1:2 by weight) was then added to achieve a solid content of 25% by weight. The mixture was heated to 40°C and dissolved for 1 hour. The resulting mixture was filtered through a membrane filter with a pore size of 0.45 μm to obtain a polymerizable composition solution.

[0094] The preparation method of liquid crystal cured film is as follows:

[0095] The first step is to obtain a polymerizable composition solution according to the above preparation method.

[0096] The second step is to coat the above polymerizable composition solution onto a substrate film that has been corona-treated to form a polymerizable composition solution layer.

[0097] The substrate film used is a PET film (CH-195Y) manufactured by Nan Ya Plastics Co., Ltd. Corona treatment was performed using a Hefeng corona treatment machine at a cleaning speed of 50 mm / s. The purpose of corona treatment is to generate alcohol or ketone functional groups on the substrate surface. Coating was carried out using a wire rod coater.

[0098] The third step is to place the substrate film that forms the polymerizable composition solution layer on a hot plate and heat it at a temperature of 90°C for 90 seconds.

[0099] The fourth step involves subjecting the heated substrate film to ultraviolet irradiation at 80°C to form a liquid crystal curing film.

[0100] The above ultraviolet irradiation was performed using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by Ushio Electric Co., Ltd.) to irradiate the polymerizable composition solution layer with ultraviolet light under a nitrogen atmosphere. The cumulative light intensity at a wavelength of 365nm was ≥500mJ / cm2.

[0101] The thickness of the liquid crystal curing film provided in Example 1 is 1.2 μm.

[0102] Table 1. Composition and mass parts of the polymerizable composition of Example 1

[0103] Ⅰ20-1 Ⅱ1 Ⅲ1 Megafac F-556 Irgacure369 antioxidants 40 60 1.5 0.5 4 0.7

[0104] Examples 2-5

[0105] The polymerizable composition solution and liquid crystal cured film were prepared according to the same method as in Example 1, as shown in Tables 2-5 below. The thicknesses of the liquid crystal cured films provided in Examples 2-5 are 1.1 μm, 1.1 μm, 1.3 μm, and 1.1 μm, respectively.

[0106] Table 2. Composition and mass fractions of the polymerizable composition of Example 2

[0107] Ⅰ20-1 Ⅱ1 Ⅲ1 Megafac F-556 Irgacure369 antioxidants 30 70 1.5 0.5 4 0.7

[0108] Table 3. Composition and mass fractions of the polymerizable composition in Example 3

[0109] Ⅰ20-1 Ⅱ1 Ⅲ1 Megafac F-556 Irgacure369 antioxidants 50 50 1.5 0.5 4 0.7

[0110] Table 4. Composition and mass fractions of the polymerizable composition in Example 4

[0111] Ⅰ20-1 Ⅱ1 Ⅲ1 Megafac F-556 Irgacure369 antioxidants 40 60 0.5 0.5 4 0.7

[0112] Table 5. Composition and mass fractions of the polymerizable composition of Example 5

[0113] Ⅰ20-1 Ⅱ1 Ⅲ1 Megafac F-556 Irgacure369 antioxidants 40 60 2.5 0.5 4 0.7

[0114] Examples 6-8

[0115] Using the same polymerizable composition solution and liquid crystal curable film preparation method as in Example 1, liquid crystal curable films with thicknesses of 2.1 μm, 2.9 μm, and 4.7 μm were prepared as Examples 6 to 8 using the polymerizable composition composition shown in Table 1.

[0116] Comparative Examples 1-3

[0117] The polymerizable composition solution and liquid crystal cured film were prepared according to the same method as in Example 1, as shown in Tables 6-8 below. The thicknesses of the liquid crystal cured films provided in Comparative Examples 1-3 were 1.2 μm, 1.1 μm, and 1.2 μm, respectively.

[0118] Table 6. Composition and mass parts of the polymerizable composition of Comparative Example 1

[0119] Ⅰ20-1 Ⅲ1 Megafac F-556 Irgacure369 antioxidants 100 1.5 0.5 4 0.7

[0120] Table 7. Composition and mass parts of the polymerizable composition of Comparative Example 2

[0121] Ⅰ20-1 Ⅱ1 Ⅲ1 Megafac F-556 Irgacure369 antioxidants 70 30 1.5 0.5 4 0.7

[0122] Table 8. Composition and mass parts of the polymerizable composition of Comparative Example 3

[0123] Ⅰ20-1 Ⅱ1 Megafac F-556 Irgacure369 antioxidants 50 50 0.5 4 0.7

[0124] Comparative Example 4

[0125] The polymerizable composition solution and liquid crystal curable film were prepared according to Table 4 above, except that a spin coating process was used for coating, and glass was used as the substrate film. The other steps of the preparation method of the liquid crystal curable film remained unchanged, the same as in Example 4. The thickness of the liquid crystal curable film provided in Comparative Example 4 was 1.5 μm.

[0126] Comparative Examples 5-7

[0127] Comparative Examples 5-7 were prepared according to Table 1 above, including polymerizable composition solutions and liquid crystal curable films. The differences were that the liquid crystal curable film provided in Comparative Example 5 was irradiated with ultraviolet light at room temperature, the PET substrate film used in the liquid crystal curable film provided in Comparative Example 6 was not corona treated, and the liquid crystal curable film provided in Comparative Example 7 was irradiated with ultraviolet light at 40°C.

[0128] Table 9 below shows the evaluation results of the tests conducted on the liquid crystal curing films provided in the examples and comparative examples.

[0129] Table 9 Evaluation results of liquid crystal curing films in the examples and comparative examples

[0130]

[0131] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A method for preparing a liquid crystal curable film, characterized in that, The invention comprises a polymerizable composition comprising a mixture of one or more compounds of Formula I and one or more compounds of Formula II, and further comprising one or more compounds of Formula III as an additive. In formula I, L1 represents H, F, Cl, CN, or a straight-chain, branched, or cyclic alkyl group having 1 to 25 carbon atoms, an alkenyl group having 2 to 25 carbon atoms, or an alkynyl group having 2 to 25 carbon atoms, wherein one or more non-adjacent -CH2- groups are optionally substituted with -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, or -N-, and the -O- or -S- atoms in the substituted group are not directly connected to each other, wherein one or more H atoms in one or more -CH2- groups are optionally substituted with halogens; It represents 1,4-cyclohexylene, 1,4-phenylene, 2,6-naphthylene, 1,5-naphthylene, or 1,4-naphthylene; Sp1 and Sp2 each independently represent the spacer basis; P1 and P2 each independently represent a polymerizable group or H, and at least one of P1 and P2 represents a polymerizable group; a, b, and c can each independently represent 1, 2, or 3; In formula II, S 11 Indicates a polymerizable group; I 11 Indicates a spacer base or a single bond; H 11 The carbon atoms in the group are alkylene, alkoxyene, alkylene carbonyl, alkoxycarbonyl, alkylene carbonyloxy, or alkoxycarbonyloxy; M 11 It represents F, Cl, CN, NO2, OCN, SCN, fluoroalkyl groups with 1 to 10 carbon atoms, or fluoroalkoxy groups with 1 to 10 carbon atoms; In Formula III, X1 and X3 can each independently represent H, F, Cl, CN, OCN, CHO, COOH or NO2; X2 represents a single bond, -CH=CH-, -C≡C-, or a cyclic group; m, n, and q each independently represent integers from 0 to 10; The mixture contains 30% to 50% by mass of the compound represented by Formula I and 50% to 70% by mass of the compound represented by Formula II; the amount of the compound represented by Formula III added relative to the total amount of the compounds represented by Formula I and Formula II is 0.5% to 2.5%. The polymerizable composition is incorporated into a solvent to form a polymerizable composition solution; The polymerizable composition solution is coated onto a corona-treated PET film using a wire bar coater to form a polymerizable composition solution layer; The PET film forming the polymerizable composition solution layer is placed on a hot plate and heated. The heated PET film is then exposed to ultraviolet light at 80°C to form a liquid crystal cured film.

2. The method for preparing the liquid crystal curable film according to claim 1, characterized in that, In formula II, M 11 It represents CN.

3. The method for preparing the liquid crystal curable film according to claim 1, characterized in that, In Formula III, X1 represents CHO, X3 represents H, and X2 represents a cycloalkyl group with 3 to 8 carbon atoms or an aryl group with 6 to 15 carbon atoms.

4. The method for preparing the liquid crystal curable film according to claim 1, characterized in that, The polymerizable composition further comprises one or more additives, including antioxidants, photoinitiators, leveling agents, surfactants, chain transfer agents, sensitizers, UV stabilizers, or polymerization inhibitors.

5. A liquid crystal curable film, characterized in that, The liquid crystal curing film is prepared by the method for preparing liquid crystal curing film according to any one of claims 1 to 4.

6. The liquid crystal curing film according to claim 5, characterized in that, The liquid crystal curing film is a vertically oriented liquid crystal curing film.

7. The liquid crystal curing film according to claim 5, characterized in that, The Rth of the liquid crystal curing film is between 50nm and 500nm.

8. The liquid crystal curing film according to claim 5, characterized in that, The thickness of the liquid crystal curing film is 1μm to 5μm.

9. A display device, characterized in that, It includes the liquid crystal curing film according to any one of claims 5 to 8.

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