Polymerizable composition, polarizing film and method for preparing the same, display element and display device

Abstract

The present invention discloses a polymerizable composition, comprising one or more polymerizable liquid crystal compounds, one or more self-aligning agents, and one or more dichroic dyes. The present invention also provides a polarizing film comprising the polymerizable composition, and a preparation method and use thereof. The polarizing film prepared using the polymerizable composition has a high transmittance and a high degree of polarization, and has good stability.

Description

Technical Field

[0001] The present invention relates to the field of optical films, and more specifically, to a polymerizable composition, a polarizing film, a method for preparing the polarizing film, a display element, and a display. Background Art

[0002] At present, in flat panel display devices (FPDs), whether liquid crystal display (LCD) devices or organic light emitting semiconductor display (OLED) devices, polarizing films are required to obtain polarized light. The most widely used polarizing film currently consists of a polarizing layer obtained by oriented adsorption of dichroic pigments such as iodine on a polyvinyl alcohol resin film, and a protective layer formed by materials such as triacetyl cellulose film. In recent years, flat panel display devices have been continuously developed in the direction of thinner thickness. This requires the thickness of the polarizing film to be continuously reduced, and to develop films adapted to the development requirements of thinner display devices. In recent years, a coated polarizing film formed by polymeric liquid crystals and dichroic dyes has been disclosed, but the transmittance and polarization degree of such polarizing films cannot be taken into account at the same time, that is, when the transmittance of the polarizing film is high, the polarization degree is low, and when the polarization degree is high, the transmittance is low.

[0003] Therefore, developing a polarizing film that has high transmittance and polarization degree as well as excellent stability is an urgent problem to be solved. Summary of the Invention

[0004] To address the problem of coated polarizing films being unable to simultaneously achieve high transmittance and high polarization, the present invention provides a polymerizable composition containing a self-aligning agent. Polarizing films prepared using this polymerizable composition exhibit high transmittance and high polarization, while also possessing excellent stability. This invention proposes a new approach to preparing coated polarizing films, expanding the concept of polymer films and materials for preparing coated polarizing films.

[0005] Specifically, the present invention includes the following contents:

[0006] In a first aspect of the present invention, there is provided a polymerizable composition comprising one or more polymerizable liquid crystal compounds, one or more self-aligning agents, and one or more dichroic dyes;

[0007] Wherein, the one or more dichroic dyes are compounds represented by formula I:

[0008]

[0009] in:

[0010] Contains at least one structure represented by formula Ia,

[0011] -A x1 -N=NA x2- Ia;

[0012] A x1 and A x2 each independently represents a divalent aromatic group which may have substituents, and m represents 0, 1, 2 or 3;

[0013] A1, A2, A3 each independently represent a divalent aromatic group which may have substituents;

[0014] Z1, Z2 each independently represent a single bond, -CH2-, -CH2CH2-, -O-, -CH2O-, -OCH2-, -CO-, -COO-, -OCO-, -OCOO-, -CR a =CR b -, -C≡C-, -CR a =N-, -CONR a -, -NR a CO- or -N=N-; R a , R b each independently represents H or an alkyl group having 1 to 4 carbon atoms;

[0015] P1, P2 each independently represent H or a polymerizable group, and at least one of P1 and P2 represents a methacrylate group or an acrylate group;

[0016] Sp1, Sp2 each independently represent an alkylene group or a cycloalkylene group having 1 to 20 carbon atoms, an alkenylene group having 2 to 20 carbon atoms or an alkynylene group having 2 to 20 carbon atoms, and one or more non-adjacent -CH2- in the alkylene group, alkenylene group or alkynylene group may be replaced by -O-, -S- or -NR c - substituted, R c represents H or an alkyl group having 1 to 4 carbon atoms;

[0017] T1, T2 each independently represent a single bond, -O-, -S-, -CO-, -COO-, -OCO-, -OCOO-, -CONR d - or -NR d CO-, when P2 represents H, T2 represents -NR e -;

[0018] R d 、R e each independently represent H or an alkyl group having 1 to 4 carbon atoms, and the alkyl group represented by R e may form a ring structure with Sp1 or Sp2. [[ID=,57]]

[0019] Furthermore, the one or more self-aligning agents are compounds represented by Formula II,

[0020]

[0021] Wherein:

[0022] R0 represents an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or a plurality of non-adjacent -CH2- in the group represented by R0 are optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group, and any one or a plurality of non-adjacent -CH2- can be substituted by -O-;

[0023] q represents 1 or 2;

[0024] L1, L2, L3, L4 each independently represent F, Cl, H, an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or more -CH2- can be substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group;

[0025] n1, n2 each independently represent 0, 1, 2, 3 or 4;

[0026] n3, n4 each independently represent 0, 1 or 2;

[0027] X1, X2 each independently represent H, -Sp-OH or an alkyl group having 1 to 10 carbon atoms; any one or a plurality of non-adjacent -CH2- in the alkyl group are optionally substituted by -O-, a cyclopentylene group, a cyclobutylene group or a cyclopropylene group; and at least one of X1 and X2 represents -Sp-OH;

[0028] P3, P4 each independently represent H or a polymerizable group;

[0029] Sp, Sp3, Sp4 each independently represent a single bond or a spacer group;

[0030] represents a fused ring, a spiro ring, a bridged ring, a cyclohexylene group, a cyclohexenylene group, an oxacyclohexylene group or a phenylene group; when q represents 2, can be the same or different.

[0031] Furthermore, the polymerizable liquid crystal compound is a polymerizable smectic B phase liquid crystal compound.

[0032] Further, the polymerizable smectic B phase liquid crystal compound is a compound represented by Formula III,

[0033]

[0034] wherein:

[0035] A4 and A5 each independently represent a divalent aromatic group or a divalent alicyclic hydrocarbon group, and the hydrogen atoms contained in the divalent aromatic group or divalent alicyclic hydrocarbon group may be substituted by a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group, and the carbon atoms in the divalent aromatic group or divalent alicyclic hydrocarbon group may be substituted by an oxygen atom, a sulfur atom or a nitrogen atom; at least one of A4 and A5 represents a 1,4-phenylene group which may have a substituent or a 1,4-cyclohexylene group which may have a substituent;

[0036] Z3 each independently represents a single bond or a divalent linking group;

[0037] n is 1, 2 or 3. When n is 2 or 3, A4 and Z3 may be the same or different;

[0038] P5 and P6 each independently represent H or a polymerizable group, and at least one of P5 and P6 represents a polymerizable group;

[0039] Sp5 and Sp6 each independently represent a single bond or a spacer group;

[0040] T3 and T4 each independently represent an alkylene group having 1 to 20 carbon atoms which may have a substituent, and one or more non-adjacent -CH2- in the alkylene group may be substituted by -O-, -CO-, -S- or -NH-.

[0041] Further, the polymerizable composition further includes one or more initiators, and the initiators include a photopolymerization initiator and / or a thermal polymerization initiator.

[0042] In a second aspect of the present invention, there is provided a polarizing film which is polymerized from the above polymerizable composition.

[0043] Further, the transmittance of the polarizing film is 30% or more, and the degree of polarization is 99% or more; the thickness of the polarizing film is 1 to 5 microns.

[0044] In a third aspect of the present invention, there is provided a method for preparing a polarizing film, which includes the following steps:

[0045] Polymerize and dissolve the above polymerizable composition in a solvent to form a polymerizable composition solution;

[0046] Coat the polymerizable composition solution onto a substrate having an alignment layer to form a polymerizable composition solution layer;

[0047] Heat and dry the polymerizable composition solution layer, and cool the dried polymerizable composition solution layer to room temperature to form a dry film on the alignment layer;

[0048] Irradiate the dry film with an ultraviolet irradiation device to form a polarizing film.

[0049] Furthermore, the substrate is a substrate having a horizontal alignment layer.

[0050] In a fourth aspect of the present invention, there is provided a display element comprising the above-mentioned polymerizable composition or the above-mentioned polarizing film.

[0051] In a fifth aspect of the present invention, there is provided a display comprising the above-mentioned polymerizable composition or the above-mentioned polarizing film.

[0052] The beneficial effects of the present invention are as follows:

[0053] The polymerizable composition provided by the present invention has a simple composition and high solubility, and can form a uniform polymerizable composition solution. The coated polarizing film polymerized from the polymerizable composition provided by the present invention has a uniform film thickness, and at the same time has a high transmittance and a high degree of polarization, and has good stability. When the polarizing film provided by the present invention achieves the same level of polarization degree, it can effectively reduce the addition amount of dichroic dyes, reduce the production cost of the coated polarizing film, increase the transmittance of the polarizing film, and has a positive effect on reducing the energy consumption of the display element or display using the above-mentioned polarizing film. Detailed Embodiments

[0054] To more clearly illustrate the present invention, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the specific content described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0055] In the present invention, the mention of "may also contain..." means that this component may or may not be present in the composition;

[0056] In the present invention, the "solvent" mentioned refers to an organic solvent and there is no particular limitation on its type, but an organic solvent in which the polymerizable composition shows good solubility is preferred, and an organic solvent that can be dried below 130 °C is preferred. As such solvents, for example, aromatic hydrocarbons such as toluene, xylene, cumene, and mesitylene, ester solvents such as methyl acetate, ethyl acetate, propyl acetate, and butyl acetate, ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and cyclopentanone, ether solvents such as tetrahydrofuran, 1,2-dimethoxyethane, and anisole, amide solvents such as N,N-dimethylformamide and N-methyl-2-pyrrolidone, propylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether acetate, γ-butyrolactone, and chlorobenzene can be cited. These organic solvents can be used alone or in combination of two or more, but from the aspect of solution stability, it is preferred to use any one or more of ketone solvents, ether solvents, ester solvents, and aromatic hydrocarbon solvents.

[0057] If the polymerizable composition used in the present invention is made into a solution of an organic solvent, it can be coated on a substrate. The ratio of the organic solvent used in the polymerizable composition has no particular limitation as long as the coating state is not significantly damaged, but the total amount of the organic solvent contained in the polymerizable composition is preferably 30 to 90% by mass, more preferably 40 to 85% by mass, and particularly preferably 50 to 80% by mass.

[0058] When dissolving the polymerizable composition in an organic solvent, in order to dissolve it uniformly, heating and stirring are preferred. The heating temperature during heating and stirring is preferably adjusted appropriately in consideration of the solubility of the composition used in the organic solvent, but from the aspect of productivity, it is preferably 15 °C to 110 °C, more preferably 15 °C to 90 °C, further preferably 15 °C to 60 °C, and particularly preferably 40 °C to 50 °C.

[0059] In the present invention, the "initiator" mentioned refers to a photoinitiator and a thermal initiator, and it preferably contains at least one photoinitiator and at least one thermal initiator.

[0060] Specifically, examples of the photoinitiator include: “Irgacure651”, “Irgacure 184”, “Darocur 1173”, “Irgacure 907”, “Irgacure127”, “Irgacure 369”, “Irgacure 379”, “Irgacure 819”, “Irgacure2959”, “Irgacure 1800”, “Irgacure 250”, “Irgacure 754”, “Irgacure784”, “Irgacure OXE01”, “Irgacure OXE02”, “Lucirin TPO”, “Darocur 1173”, “Darocur MBF” manufactured by BASF Japan Ltd.; “Esacure1001M”, “Esacure KIP150”, “Speedcure BEM”, “Speedcure BMS”, “Speedcure MBP”, “Speedcure PBZ”, “SpeedcureITX”, “SpeedcureDETX”, “Speedcure EBD”, “Speedcure MBB”, “Speedcure BP” manufactured by LAMBSON; “Kayacure DMBI” manufactured by Nippon Kayaku Co., Ltd.; “TAZ-A” manufactured by Nihon Siber Hegner Co., Ltd. (currently DKSH Japan Co., Ltd.); “Adeka Optomer SP-152”, “Adeka Optomer SP-170”, “Adeka OptomerN-1414”, “Adeka Optomer N-1606”, “Adeka Optomer N-1717”, “AdekaOptomer N-1919” manufactured by Adeka Corporation, etc.

[0061] The usage amount of the initiator is preferably 0.1 to 10% by mass percentage relative to the polymerizable composition, and particularly preferably 0.5 to 7% by mass percentage. In addition, a sensitizer or the like may also be added.

[0062] In the present invention, the “additive” mentioned is a component for improving the stability of the polymerizable composition of the present invention, including antioxidants, surfactants, polymerization inhibitors, chain transfer agents, etc. These additives can be selectively added one or several of them or not added according to the stability performance of the formulation.

[0063] Polymerization inhibitor: It is preferred to add a polymerization inhibitor to the polymerizable composition of the present invention. Examples of the polymerization inhibitor include: phenolic compounds, quinone compounds, amine compounds, thioether compounds, nitroso compounds, etc. Examples of the phenolic compounds include p-methoxyphenol, cresol, tert-butylcatechol, 3,5-di-tert-butyl-4-hydroxytoluene, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 4,4'-thiobis(3-methyl-6-tert-butylphenol), 4-methoxy-1-naphthol, 4,4'-dialkoxy-2,2'-bi-1-naphthol, etc. Examples of the quinone compounds include: hydroquinone, methylhydroquinone, tert-butylhydroquinone, p-benzoquinone, methyl-p-benzoquinone, tert-butyl-p-benzoquinone, 2,5-diphenylbenzoquinone, 2-hydroxy-1,4-naphthoquinone, 1,4-naphthoquinone, 2,3-dichloro-1,4-naphthoquinone, anthraquinone, biphenylquinone, etc. Examples of the amine compounds include: p-phenylenediamine, 4-aminodiphenylamine, N,N'-diphenyl-p-phenylenediamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, N,N'-di-2-naphthyl-p-phenylenediamine, diphenylamine, N-phenyl-β-naphthylamine, 4,4'-di-tert-butyl-diphenylamine, 4,4'-dioctyl-diphenylamine, etc. Examples of the thioether compounds include: phenothiazine, distearyl thiodipropionate, etc. Examples of the nitroso compounds include: N-nitrosodiphenylamine, N-nitrosophenylnaphthylamine, N-nitrosodinaphthylamine, p-nitrosophenol, nitrosobenzene, p-nitrosodiphenylamine, α-nitroso-β-naphthol, etc., N,N-dimethyl-p-nitrosoaniline, p-nitrosodiphenylamine, p-nitrosodimethylamine, p-nitroso-N,N-diethylamine, N-nitrosoethanolamine, N-nitrosodi-n-butylamine, N-nitroso-N-n-butyl-4-butanolamine, N-nitroso-diisopropanolamine, N-nitroso-N-ethyl-4-butanolamine, 5-nitroso-8-hydroxyquinoline, N-nitrosomorpholine, N-nitroso-N-phenylhydroxylamine ammonium salt, nitrosobenzene, 2,4,6-tri-tert-butylnitrosobenzene, N-nitroso-N-methyl-p-toluenesulfonamide, N-nitroso-N-ethylcarbamate, N-nitroso-N-n-propylcarbamate, 1-nitroso-2-naphthol, 2-nitroso-1-naphthol, 1-nitroso-2-naphthol-3,6-sodium sulfonate, 2-nitroso-1-naphthol-4-sodium sulfonate, 2-nitroso-5-methylaminophenol hydrochloride, 2-nitroso-5-methylaminophenol hydrochloride, etc. The addition amount of the polymerization inhibitor is preferably 0.01 to 1.0% by mass percentage based on the polymerizable composition, and more preferably 0.05 to 0.5% by mass percentage.

[0064] Antioxidants: In order to improve the stability of the polymerizable composition of the present invention, it is preferable to add antioxidants and the like. Examples of such compounds include: hydroquinone derivatives, nitrosoamine-based polymerization inhibitors, hindered phenol-based antioxidants, etc. More specifically, examples include: tert-butyl hydroquinone, methyl hydroquinone, "Q-1300" and "Q-1301" manufactured by Wako Pure Chemical Industries, Ltd., "IRGANOX1010", "IRGANOX1035", "IRGANOX1076", "IRGANOX1098", "IRGANOX1135", "IRGANOX1330", "IRGANOX1425", "IRGANOX1520", "IRGANOX1726", "IRGANOX245", "IRGANOX259", "IRGANOX3114", "IRGANOX3790", "IRGANOX5057", "IRGANOX565", etc. manufactured by BASF. The addition amount of the antioxidant is preferably 0.01 to 2.0% by mass percentage based on the polymerizable liquid crystal composition, and more preferably 0.05 to 1.0% by mass percentage.

[0065] Surfactant: In order to reduce the film thickness unevenness when producing an optically anisotropic body, the polymerizable composition of the present invention may also contain at least one or more surfactants. Examples of the surfactants that can 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. Fluorosurfactants are particularly preferred. Specifically, examples include: "Megafac F-251", "Megafac F-444", "Megafac F-477", "Megafac F-510", "Megafac F-552", "Megafac F-553", "Megafac F-554", "MegafacF-555", "Megafac F-556", "Megafac F-557", "Megafac F-558", "Megafac F-559", "MegafacF-560", "Megafac F-561", "Megafac F-562", "Megafac F-563", "MegafacF-565", "Megafac F-567", "Megafac F-568", "Megafac F-569", "Megafac F-570", "Megafac F-571", "Megafac R-40", "Megafac R-41", "Megafac R-43", "Megafac R-94", "Megafac RS-72-K", "Megafac RS-75", "Megafac RS-76-E", "Megafac RS-90", (the above are manufactured by DIC Corporation), "Ftergent 100", "Ftergent 100C", "Ftergent 110", "Ftergent 150", "Ftergent150CH", "Ftergent A", "Ftergent 100A-K", "Ftergent 501", "Ftergent300", "Ftergent310", "Ftergent 320", "Ftergent 400SW", "FTX-400P", "Ftergent251", "Ftergent215M", "Ftergent 212MH", "Ftergent 250", "Ftergent 222F", "Ftergent"212D", "FTX-218", "FTX-209F", "FTX-213F", "FTX-233F", "Ftergent 245F", "FTX-208G", "FTX-240G", "FTX-206D", "FTX-220D", "FTX-230D", "FTX-240D", "FTX-207S", "FTX-211S", "FTX-220S", "FTX-230S", "FTX-750FM", "FTX-730FM", "FTX-730FL", "FTX-710FS", "FTX-710FM", "FTX-710FL", "FTX-750LL", "FTX-730LS", "FTX-730LM", "FTX-730LL", "FTX-710LL" (manufactured by Noes Co., Ltd. above), "BYK-300", "BYK-302", "BYK-306", "BYK-307", "BYK-310", "BYK-315", "BYK-320", "BYK-322", "BYK-323", "BYK-325", "BYK-330", "BYK-331", "BYK-333", "BYK-337", "BYK-340", "BYK-...Examples include those made by Solexis Co., Ltd. The addition amount of the surfactant is preferably 0.01 to 2% by mass percentage based on the mass of the polymerizable composition, more preferably 0.05 to 0.5% by mass percentage. In addition, by using the above surfactant, when the polymerizable composition of the present invention is made into an optically anisotropic body, the tilt angle of the air interface can be effectively reduced. In addition, by using the above surfactant, good orientation can be achieved. In particular, it has been clarified that if the above polymerizable haze improver is used in combination with the surfactant, the orientation can be significantly improved by a synergistic effect.

[0066] Chain transfer agent: In order to improve the adhesion to the substrate when the polymerizable composition of the present invention is made into an optically anisotropic body, a chain transfer agent is also preferably added. As the chain transfer agent, a thiol compound is preferred, and a monothiol, dithiol, trithiol, or tetrathiol compound is more preferred, and a trithiol compound is further more preferred. The addition amount of the chain transfer agent is preferably 0.5 to 10% by mass percentage based on the mass of the polymerizable liquid crystal composition, more preferably 1.0 to 5.0% by mass percentage.

[0067] In the present invention, the "substrate" mentioned is a carrier for carrying the polymerizable composition. The substrate used in the optically anisotropic body of the present invention is mainly a substrate commonly used in liquid crystal devices, displays, optical parts, and optical films, and there is no particular limitation on the material having the following heat resistance, which refers to the heat resistance that can withstand the heating during drying after coating the polymerizable composition of the present invention. Examples of such substrates include: glass substrates, metal substrates, ceramic substrates, and organic materials such as plastic substrates. In particular, when the substrate is an organic material, examples include: cellulose derivatives, polyolefins, polyesters, polycarbonates, polyacrylates (acrylic resins), polyarylates, polyethersulfones, polyimides, polyphenylene sulfides, polyphenylene ethers, nylons, or polystyrenes. Among them, plastic substrates such as polyesters, polystyrenes, polyacrylates, polyolefins, cellulose derivatives, polyarylates, and polycarbonates are preferred, and substrates such as metals, polyethylene terephthalate (PET), and cellulose derivatives (PVA) are further preferred. As the shape of the substrate, in addition to a flat plate, it can also have a curved surface. These substrates can have an electrode layer, an antireflection function, and a reflection function as needed.

[0068] In the present invention, the "coating" mentioned means that as a coating method for obtaining the polymerizable composition of the present invention, known and commonly used methods such as a coater method, a bar coating method, a spin coating method, a roll coating method, a direct gravure coating method, an inverse gravure coating method, a flexo coating method, an inkjet method, a die coating method, a cap coating method, a dip coating method, and a slot coating method can be used. After coating the polymerizable composition, it is dried as needed.

[0069] In the present invention, the "polymerization" mentioned herein refers to the polymerization operation of the polymerizable composition of the present invention. When the polymerization is carried out by irradiation with light, specifically, irradiation with 369 nm ultraviolet light is preferred, and the light is preferably unpolarized light.

[0070] In the present invention, the "alignment" mentioned here refers to treating the surface of the base film by friction or using a photo-alignment agent so that the compound molecules can be better arranged according to a certain pattern on the surface of the base film.

[0071] In the present invention, the "room temperature" mentioned refers to the temperature range of 15°C to 35°C.

[0072] In the present invention, the "spacer" mentioned here means an alkyl group having 1-10 carbon atoms, a fluorine-substituted alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, a fluorine-substituted alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, a fluorine-substituted alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 3-8 carbon atoms, or a fluorine-substituted alkenyloxy group having 3-8 carbon atoms, an alkynyl group having 2-10 carbon atoms, a fluorine-substituted alkynyl group having 2-10 carbon atoms, an alkynyloxy group having 2-8 carbon atoms, or a fluorine-substituted alkynyloxy group having 3-8 carbon atoms, and any one or more unconnected -CH2- groups in the group represented by the spacer may be independently substituted with -O-, -S-, -COO-, or -OOC-.

[0073] In the present invention, the "polymerizable group" refers to a methacrylate group, an acrylate group, or an oxirane group, and is preferably an acrylate group or a methacrylate group.

[0074] [Polymerizable composition]

[0075] One aspect of the present invention is a polymerizable composition comprising one or more polymerizable liquid crystal compounds, one or more self-aligning agents, and one or more dichroic dyes;

[0076] The one or more dichroic dyes are compounds represented by formula I,

[0077]

[0078] in, Contains at least one structure represented by formula Ia,

[0079] -A x1 -N=NA x2 - Ⅰa;

[0080] A x1 and A x2Each independently represents a divalent aromatic group which may have substituents; for example, both may each independently be selected from

[0081] m represents 0, 1, 2 or 3;

[0082] A1, A2, A3 each independently represent a divalent aromatic group which may have substituents; for example, the three may each independently be selected from

[0083] Z1, Z2 each independently represent a single bond, -CH2-, -CH2CH2-, -O-, -CH2O-, -OCH2-, -CO-, -COO-, -OCO-, -OCOO-, -CR a =CR b -, -C≡C-, -CR a =N-, -CONR a -, -NR a CO- or -N=N-; R a , R b each independently represents H or an alkyl group having 1 to 4 carbon atoms;

[0084] P1, P2 each independently represent H or a polymerizable group, and at least one of P1 and P2 represents a methacrylate group or an acrylate group;

[0085] Sp1, Sp2 each independently represent an alkylene group or a cycloalkylene group having 1 to 20 carbon atoms, an alkenylene group having 2 to 20 carbon atoms or an alkynylene group having 2 to 20 carbon atoms, and one or more non-adjacent -CH2- in the alkylene group, alkenylene group or alkynylene group may be replaced by -O-, -S- or -NR c -, R c represents H or an alkyl group having 1 to 4 carbon atoms;

[0086] T1, T2 each independently represent a single bond, -O-, -S-, -CO-, -COO-, -OCO-, -OCOO-, -CONR d - or -NR d CO-, when P2 represents H, T2 represents -NR e -;

[0087] R d 、R e each independently represents H or an alkyl group having 1 to 4 carbon atoms, and the alkyl group represented by R e may form a ring structure with Sp1 or Sp2.

[0088] Preferably, the compound represented by the above formula I is selected from the group consisting of the compounds represented by formula I1 to formula I72:

[0089]

[0090]

[0091]

[0092]

[0093] Further preferably, the compound shown in the above formula I is selected from the group consisting of the compounds shown in the above formulae I1 to I8, I37 to I42, and I58 to I63.

[0094] Preferably, the above self-aligning agent is a compound shown in formula II,

[0095]

[0096] wherein,

[0097] R0 represents an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or more non-adjacent -CH2- groups in the group represented by R0 are optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group, and any one or more non-adjacent -CH2- groups can be substituted by -O-;

[0098] q represents 1 or 2;

[0099] L1, L2, L3, and L4 each independently represent F, Cl, H, an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or more -CH2- groups can be substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group;

[0100] n1 and n2 each independently represent 0, 1, 2, 3 or 4; n3 and n4 each independently represent 0, 1 or 2;

[0101] X1 and X2 each independently represent H, -Sp-OH or an alkyl group having 1 to 10 carbon atoms; any one or more non-adjacent -CH2- groups in the alkyl group are optionally substituted by -O-, a cyclopentylene group, a cyclobutylene group or a cyclopropylene group; at least one of X1 and X2 represents -Sp-OH;

[0102] P3 and P4 each independently represent H or a polymerizable group, and Sp, Sp3, and Sp4 each independently represent a single bond or a spacer group;

[0103] represents a condensed ring, a spiro ring, a bridged ring, a cyclohexylene group, a cyclohexenylene group, an oxacyclohexylene group, or a phenylene group; when q represents 2, may be the same or different. For example: is optionally selected from

[0104] Preferably, the compound represented by the foregoing formula II is selected from the group consisting of the compounds represented by formula II1 to formula II35;

[0105]

[0106]

[0107]

[0108]

[0109]

[0110] Preferably, the above-mentioned polymerizable liquid crystal compound is a polymerizable smectic B phase liquid crystal compound.

[0111] Preferably, the above-mentioned polymerizable smectic B phase liquid crystal compound is a compound represented by formula III,

[0112]

[0113] In formula III, A4 and A5 each independently represent a divalent aromatic group or a divalent alicyclic hydrocarbon group, and the hydrogen atoms contained in the divalent aromatic group or the divalent alicyclic hydrocarbon group may be substituted by a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, or a nitro group, and the carbon atoms in the divalent aromatic group or the divalent alicyclic hydrocarbon group may be substituted by an oxygen atom, a sulfur atom, or a nitrogen atom; at least one of A4 and A5 represents a 1,4-phenylene group that may have a substituent or a 1,4-cyclohexane that may have a substituent;

[0114] Z3 each independently represents a single bond or a divalent linking group;

[0115] n is 1, 2, or 3, and when n is 2 or 3, A4 and Z3 may be the same or different;

[0116] P5 and P6 each independently represent H or a polymerizable group, and at least one of P5 and P6 represents a polymerizable group;

[0117] Sp5 and Sp6 each independently represent a single bond or a spacer group;

[0118] T3 and T4 each independently represent an alkylene group having 1 to 20 carbon atoms which may have substituents, and one or more non-adjacent -CH2- in the alkylene group may be substituted by -O-, -CO-, -S- or -NH-.

[0119] Preferably, the compound represented by Formula III above is selected from the group consisting of the compounds represented by Formulae III1 to III30;

[0120]

[0121]

[0122]

[0123] More preferably, the compound represented by Formula III above is specifically selected from the group consisting of the compounds represented by Formulae III2 to III8, Formulae III13 to III17, III27 and III29. One compound can be selected, or multiple compounds can be selected.

[0124] The polymerizable composition of the present invention further includes one or more UV curing agents, and under the action of this initiator, the crosslinking and curing of the polymerizable liquid crystal compound can be initiated and promoted.

[0125] The polymerizable composition of the present invention further includes one or more initiators. The above initiators include photoinitiators and thermal initiators, and the mass percentage content thereof in the polymerizable composition is 1% to 10%, preferably 3% to 7%.

[0126] For the polymerizable composition of the present invention, the compound represented by Formula I above, its mass percentage content in the polymerizable composition is 3% to 15%, preferably 5% to 10%.

[0127] For the polymerizable composition of the present invention, the compound represented by Formula II above, its mass percentage content in the polymerizable composition is 2% to 10%, preferably 3% to 8%.

[0128] For the polymerizable composition of the present invention, the compound represented by Formula III above, its mass percentage content in the polymerizable composition is 60% to 90%, preferably 70% to 85%.

[0129] The polymerizable composition of the present invention may further include one or more additives. The addition of additives depends on the formulation, and it is not required to add all each additive.

[0130] Preferably, the above additives are one or more surfactants, chain transfer agents, sensitizers, anti-UV agents, inhibitors or antioxidants.

[0131] [Polarizing film]

[0132] The second aspect of the present invention is a polarizing film formed by polymerizing the above-mentioned polymerizable composition.

[0133] Preferably, the light transmittance of the above polarizing film is more than 30%, and the degree of polarization is more than 99%; the thickness of the above polarizing film is 1-5 microns.

[0134] More preferably, the thickness of the polarizing film is 2-4 microns.

[0135] The polarizing film provided by the present invention has a large light transmittance and a large degree of polarization. Especially when achieving the same polarization level, it can effectively reduce the addition amount of dichroic dyes and reduce the production cost of the coating type polarizing film. At the same time, the reduction of dichroic dyes further increases the light transmittance of the polarizing film, which has a positive effect on reducing the energy consumption of display elements or displays using the above polarizing film.

[0136] [Method for preparing polarizing film]

[0137] The third aspect of the present invention provides a method for preparing the above polarizing film, which specifically includes the following steps:

[0138] Dissolve the above-mentioned polymerizable composition in a solvent to form a polymerizable composition solution;

[0139] Coat the polymerizable composition solution on a substrate with an alignment layer to form a polymerizable composition solution layer;

[0140] Heat and dry the polymerizable composition solution layer, cool the dried polymerizable composition solution layer to room temperature, and form a dry film on the alignment layer;

[0141] Irradiate the dry film with an ultraviolet irradiation device to form a polarizing film.

[0142] Preferably, the above substrate is a substrate with a horizontal alignment layer.

[0143] Preferably, the above polymerizable composition solution layer is dried in an oven at 100°C - 120°C for 1 - 3 minutes.

[0144] Preferably, the above polymerizable composition solution is coated by TQC4400.

[0145] The method for preparing a polarizing film provided by the present invention has simple steps, is easy to implement, has low production cost and high production efficiency, and can achieve large-scale production.

[0146] [Display element or display device]

[0147] A fourth aspect of the present invention is a display element, which comprises the above-mentioned polymerizable composition or the above-mentioned phase retardation film, and the display element is an active matrix display element or a passive matrix display element.

[0148] A fifth aspect of the present invention is a display device, which comprises the above-mentioned polymerizable composition or comprises the above-mentioned polarizing film, and the display device is an active matrix display device or a passive matrix display device.

[0149] Preferably, the aforementioned active matrix display element or display device is an active matrix addressed liquid crystal display element or a liquid crystal display device.

[0150] Preferably, the aforementioned passive matrix display element or display device is an OLED display element or an OLED display device.

[0151] As a method for preparing the display element or display device of the present invention, the following method can be adopted: First, coat the above-mentioned polymerizable composition solution on the display device and dry it as needed. Then, irradiate with ultraviolet light to cause photopolymerization of the above-mentioned polymerizable composition. The polarizing film formed by the above-mentioned polymerizable composition can replace the conventional stretched polarizing film. Thereby, the thickness of the display element or display device can be effectively reduced, and it has a high transmittance and a high degree of polarization, and effectively simplifies the preparation process of the liquid crystal display element or liquid crystal display device, thereby being able to improve production efficiency and reduce production costs.

[0152] Examples

[0153] To illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the specific content described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0154] The preparation methods mentioned in the present invention are all conventional methods unless otherwise specified, and the raw materials used can be obtained from public commercial channels unless otherwise specified. The percentages are all mass percentages, the temperature is in degrees Celsius (°C), and the specific meanings and test conditions of other symbols are as follows:

[0155] Measurement of degree of polarization and transmittance:

[0156] Using a spectrophotometer with a polarizer (UV-3150 manufactured by Shimadzu Corporation), the transmittance (Ta) in the direction of the transmission axis and the transmittance (Tb) in the direction of the absorption axis were measured in the wavelength range of 380 nm to 780 nm using the double-beam method. A net that blocks 50% of the light quantity was set on the reference side of the polarizer. Using the following formulas (Formula 1) and (Formula 2), the transmittance and degree of polarization at each wavelength were calculated. Furthermore, through the 2-degree field of view (C light source) of JIS Z 8701, visibility correction was performed to calculate the visibility-corrected transmittance (Ty) and the visibility-corrected degree of polarization (Py).

[0157] Transmittance Ty (%) = (Ta + Tb) / 2 (Formula 1)

[0158] Degree of polarization Py (%) = (Ta - Tb) / (Ta + Tb) × 100 (Formula 2)

[0159] As a preferred embodiment, the compounds shown in Formula I, Formula II, and Formula III are preferably the compounds shown below.

[0160]

[0161] Among them, Formula I1, I40, and I72 are combined into a mixed dye in a mass ratio of 1:1:1, numbered H1.

[0162]

[0163]

[0164] Among them, Formula III27 and III29 are combined into a mixed dye in a mass ratio of 2:1, numbered H2.

[0165] Polymerization initiator: 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure 369; manufactured by Ciba Specialty Chemicals, Inc.):

[0166] Leveling agent: Polyacrylic acid The present invention also provides a polarizing film containing the polymerizable composition, and its preparation method and use. The polarizing film prepared using the polymerizable composition has a high transmittance and a high degree of polarization, and has good stability. Ester compound (BYK-361N; manufactured by BYK-Chemie):

[0167] The polymerizable composition solution and the polarizing film were prepared according to the composition and content shown in Tables 1 to 9.

[0168] The preparation method of the polymerizable composition solution is as follows:

[0169] Weigh each component according to the content shown in Tables 1 - 9, put them into a brown bottle, add a solvent, place it on a magnetic stirring instrument and stir for 1 h. Wait until the mixture is stirred evenly to obtain a polymerizable composition solution.

[0170] The preparation method of the polarizing film is as follows:

[0171] First, prepare the polymerizable composition solution according to the above method;

[0172] Then, coat the above - mentioned polymerizable composition solution on a PI substrate with a horizontal alignment layer at a speed of 20 mm / s using TQC4400 to form a polymerizable composition solution layer;

[0173] Secondly, place the substrate coated with the polymerizable composition solution layer in an oven at 120 °C and dry for 1 minute to form a dry film;

[0174] Finally, cure the above - mentioned dry film with ultraviolet light at a wavelength of 365 nm and an irradiance of 30 Mw / cm 2 for 40 s at room temperature to form a polarizing film.

[0175] Perform polarization degree and transmittance performance tests on the prepared polarizing film, as shown in Table 5.

[0176] Table 1 Composition and content of polymerizable compositions in examples and comparative examples

[0177] H1 Ⅱ35 Ⅲ27 361N 369 Cyclohexanone Toluene Comparative Example 1 0.006g — 0.2g 0.004g 0.008g 0.1g 0.3g Example 1 0.006g 0.005g 0.2g 0.004g 0.008g 0.1g 0.3g Example 2 0.006g 0.010g 0.2g 0.004g 0.008g 0.1g 0.3g Example 3 0.006g 0.015g 0.2g 0.004g 0.008g 0.1g 0.3g Example 4 0.006g 0.020g 0.2g 0.004g 0.008g 0.1g 0.3g Comparative Example 2 0.01g — 0.2g 0.004g 0.008g 0.1g 0.3g Example 5 0.01g 0.005g 0.2g 0.004g 0.008g 0.1g 0.3g Example 6 0.01g 0.010g 0.2g 0.004g 0.008g 0.1g 0.3g Example 7 0.01g 0.015g 0.2g 0.004g 0.008g 0.1g 0.3g Example 8 0.01g 0.020g 0.2g 0.004g 0.008g 0.1g 0.3g Comparative Example 3 0.012g — 0.2g 0.004g 0.008g 0.1g 0.3g Example 9 0.012g 0.005g 0.2g 0.004g 0.008g 0.1g 0.3g Example 10 0.012g 0.010g 0.2g 0.004g 0.008g 0.1g 0.3g Example 11 0.012g 0.015g 0.2g 0.004g 0.008g 0.1g 0.3g Example 12 0.012g 0.020g 0.2g 0.004g 0.008g 0.1g 0.3g

[0178] Table 2 Composition and content of polymerizable compositions in examples and comparative examples

[0179] Ⅰ1 Ⅱ35 Ⅲ27 361N 369 Cyclohexanone Toluene Example 13 0.006g 0.010g 0.2g 0.004g 0.008g 0.1g 0.3g Comparative Example 4 0.006g — 0.2g 0.004g 0.008g 0.1g 0.3g

[0180] Table 3 Composition and content of polymerizable compositions in examples and comparative examples

[0181] Ⅰ40 Ⅱ35 Ⅲ27 361N 369 Cyclohexanone Toluene Example 14 0.006g 0.010g 0.2g 0.004g 0.008g 0.1g 0.3g Comparative Example 5 0.006g — 0.2g 0.004g 0.008g 0.1g 0.3g

[0182] Table 4 Composition and content of polymerizable compositions in examples and comparative examples

[0183]

[0184]

[0185] Table 5 Composition and content of polymerizable compositions in examples and comparative examples

[0186] H1 Ⅱ35 H2 361N 369 Cyclohexanone Toluene Example 16 0.006g 0.010g 0.2g 0.004g 0.008g 0.1g 0.3g Comparative Example 7 0.006g — 0.2g 0.004g 0.008g 0.1g 0.3g

[0187] Table 6 Composition and content of polymerizable compositions in examples and comparative examples

[0188] H1 Ⅱ29 H2 361N 369 Cyclohexanone Toluene Example 17 0.006g 0.010g 0.2g 0.004g 0.008g 0.1g 0.3g Comparative Example 8 0.006g — 0.2g 0.004g 0.008g 0.1g 0.3g

[0189] Table 7 Composition and Content of Polymerizable Compositions in Examples and Comparative Examples

[0190] H1 Ⅱ13 H2 361N 369 Cyclohexanone Toluene Example 18 0.006g 0.010g 0.2g 0.004g 0.008g 0.1g 0.3g Comparative Example 9 0.006g — 0.2g 0.004g 0.008g 0.1g 0.3g

[0191] Table 8 Composition and Content of Polymerizable Compositions in Examples and Comparative Examples

[0192] H1 Ⅱ35 Ⅲ6 361N 369 Cyclohexanone Toluene Example 19 0.006g 0.010g 0.2g 0.004g 0.008g 0.1g 0.3g Comparative Example 10 0.006g — 0.2g 0.004g 0.008g 0.1g 0.3g

[0193] Table 9 Composition and Content of Polymerizable Compositions in Examples and Comparative Examples

[0194] H1 Ⅱ35 Ⅲ9 361N 369 Cyclohexanone Toluene Example 20 0.006g 0.010g 0.2g 0.004g 0.008g 0.1g 0.3g Comparative Example 11 0.006g — 0.2g 0.004g 0.008g 0.1g 0.3g

[0195] Table 10 Transmittance and Degree of Polarization of Polarizing Films

[0196]

[0197]

[0198] Table 11 provides test data on the transmittance and degree of polarization of the polarizing films after the high-temperature and high-humidity aging experiment for Examples 1-20 and Comparative Examples 1-11. High-temperature and high-humidity aging experiment conditions: Place the polarizing film in an oven at a temperature of 85 °C and a humidity of 85% for 1②0 hours.

[0199] Table 11 Transmittance and Degree of Polarization Before and After High-Temperature and High-Humidity Aging

[0200]

[0201]

[0202] From the comparison of the test data of the polarizing films provided by the above Examples 1-20 and Comparative Examples 1-11, it can be seen that the polarizing film provided by the present invention has a high transmittance and a high degree of polarization, and has good stability.

[0203] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is impossible to list all the implementation manners here. All obvious changes or variations derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A polymerizable composition, characterized in that, Comprising one or more polymerizable liquid crystal compounds, one or more self-aligning agents, and one or more dichroic dyes; Wherein, the one or more dichroic dyes are compounds represented by Formula I: I； Wherein: comprising at least one structure represented by formula Ia, Ⅰa； A x1 and A x2 each independently represents a divalent aromatic group which may have substituents, and m represents 0, 1, 2 or 3; A1, A2, and A3 each independently represent a divalent aromatic group which may have substituents; Z1 and Z2 each independently represent a single bond, -CH2-, -CH2CH2-, -O-, -CH2O-, -OCH2-, -CO-, -COO-, -OCO-, -OCOO-, -CR a =CR b -, -C≡C-, -CR a =N-, -CONR a -, -NR a CO- or -N=N-; R a , R b each independently represents H or an alkyl group having 1 to 4 carbon atoms; P1 and P2 each independently represent H or a polymerizable group, and at least one of P1 and P2 represents a methacrylate group or an acrylate group; Sp1 and Sp2 each independently represent an alkylene or cycloalkylene group having 1 to 20 carbon atoms, an alkenylene group having 2 to 20 carbon atoms, or an alkynylene group having 2 to 20 carbon atoms, and one or more non-linked -CH2- groups in the alkylene, alkenylene, or alkynylene group may be replaced by -O-, -S-, or -NR c -, where R c represents H or an alkyl group having 1 to 4 carbon atoms; T1 and T2 each independently represent a single bond, -O-, -S-, -CO-, -COO-, -OCO-, -OCOO-, -CONR d -, or -NR d CO-, provided that when P2 represents H, T2 represents -NR e -; R d 、R e each independently represents H or an alkyl group having 1 to 4 carbon atoms, and the alkyl group represented by R e may form a ring structure with Sp1 or Sp2; The one or more self-aligning agents are compounds represented by Formula II, Ⅱ； Wherein: R0 represents an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or more non-connected -CH2- are optionally substituted by a cyclopentylene group, a cyclobutylene group, or a cyclopropylene group, and any one or more non-connected -CH2- may be substituted by -O-; q represents 1 or 2; L1, L2, L3, and L4 each independently represent F, Cl, H, an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a fluorine-substituted alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or more -CH2- may be substituted by a cyclopentylene group, a cyclobutylene group, or a cyclopropylene group; n1 and n2 each independently represent 0, 1, 2, 3, or 4; n3 and n4 each independently represent 0, 1, or 2; X1 and X2 each independently represent H, or an alkyl group having 1 to 10 carbon atoms; any one or a plurality of non-adjacent -CH2- in the alkyl group are optionally substituted by -O-, cyclopentylene, cyclobutylene or cyclopropylene; and at least one of X1 and X2 represents ; P3 and P4 each independently represent H or a polymerizable group; Sp, Sp3, and Sp4 each independently represent a single bond or a spacer group; represents a fused ring, spiro ring, bridged ring, cyclohexylene, cyclohexenylene, oxacyclohexylene or phenylene; when q represents 2, may be the same or different; The polymerizable liquid crystal compound is a polymerizable smectic B phase liquid crystal compound; The polymerizable smectic B phase liquid crystal compound is a compound represented by Formula III, Ⅲ； Wherein: A4 and A5 each independently represent a divalent aromatic group or a divalent alicyclic hydrocarbon group, and the hydrogen atoms contained in the divalent aromatic group or the divalent alicyclic hydrocarbon group may be substituted by a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, or a nitro group, and the carbon atoms in the divalent aromatic group or the divalent alicyclic hydrocarbon group may be substituted by an oxygen atom, a sulfur atom, or a nitrogen atom; at least one of A4 and A5 represents a 1,4-phenylene group which may have substituents or a 1,4-cyclohexylene group which may have substituents; Z3 each independently represents a single bond or a divalent linking group; n is 1, 2, or 3. When n is 2 or 3, A4 and Z3 may be the same or different; P5 and P6 each independently represent H or a polymerizable group, and at least one of P5 and P6 represents a polymerizable group; Sp5 and Sp6 each independently represent a single bond or a spacer group; T3 and T4 each independently represent an alkylene group having 1 to 20 carbon atoms which may have substituents, and one or more non - adjacent -CH2- groups in the alkylene group may be substituted by -O-, -CO-, -S- or -NH-.

2. The polymerizable composition according to claim 1, characterized in that The polymerizable composition further includes one or more initiators, and the initiators include photo - polymerization initiators and / or thermal - polymerization initiators.

3. A polarizing film, characterized in that, The polarizing film is polymerized from the polymerizable composition according to any one of claims 1 to 2.

4. The polarizing film according to claim 3, characterized in that, The light transmittance of the polarizing film is 30% or more, and the degree of polarization is 99% or more; the thickness of the polarizing film is 1 to 5 micrometers.

5. A method for preparing a polarizing film, characterized in that, It includes the following steps: Dissolve the polymerizable composition according to any one of claims 1 to 2 in a solvent to form a polymerizable composition solution; Coat the polymerizable composition solution onto a substrate having an alignment layer to form a polymerizable composition solution layer; Heat - dry the polymerizable composition solution layer, cool the dried polymerizable composition solution layer to room temperature, and form a dry film on the alignment layer; Irradiate the dry film with an ultraviolet irradiation device to form a polarizing film.

6. A display element, characterized in that, The display element contains the polymerizable composition according to any one of claims 1 to 2 or contains the polarizing film according to any one of claims 3 to 4, and the display element is an active - matrix display element or a passive - matrix display element.

7. A display, characterized in that, The display contains the polymerizable composition according to any one of claims 1 to 2 or contains the polarizing film according to any one of claims 3 to 4, and the display is an active - matrix display or a passive - matrix display.

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