Water barrier layer, water barrier optical film, method for manufacturing the same, polarizing plate, and display device

Abstract

This invention provides a water-blocking layer, a water-blocking optical film, a method for preparing the same, a polarizer, and a display device. The water-blocking layer provided in this invention is polymerized from a polymerizable composition, wherein the polymerizable composition includes: organic / inorganic hybrid acrylate, polyurethane acrylate, and photopolymerizable acrylate monomer.

Description

Technical Field

[0001] This invention relates to the field of optical film technology, and in particular to a water-blocking layer, a water-blocking optical film and its preparation method, a polarizer and a display device. Background Technology

[0002] A polarizing film generally comprises a first cellulose triacetate film, a polarizing film, and a second cellulose triacetate film stacked sequentially. The polarizing film is made of polyvinyl alcohol (PVA) and is generally referred to as a PVA film. Both the first and second cellulose triacetate films are made of triacetyl cellulose (TAC); therefore, the first cellulose triacetate film can be called the first TAC film, and the second cellulose triacetate film can be called the second TAC film.

[0003] PVA film is the main component of polarizers that provides polarization characteristics, but it has extremely poor water resistance and is prone to deformation when it absorbs water, which leads to a decrease in polarization performance. Therefore, TAC film is used on both sides of PVA film as a water-blocking film to prevent water vapor from corroding PVA film and thus affecting its polarization performance.

[0004] The thickness of TAC film is usually 20um to 80um. Setting TAC film on both sides of PVA film will result in a larger thickness of polarizer, which is not conducive to the development of thinner polarizer. Summary of the Invention

[0005] This invention provides a water-blocking layer, a water-blocking optical film and its preparation method, a polarizer and a display device, to solve the problem of how to reduce the thickness of the water-blocking layer in the polarizer.

[0006] To solve the above-mentioned technical problems, the present invention is implemented as follows: In a first aspect, embodiments of the present invention provide a water-blocking layer.

[0007] The water-blocking layer provided in this embodiment of the invention is polymerized from a polymerizable composition, wherein the polymerizable composition includes: organic / inorganic hybrid acrylate, polyurethane acrylate and photopolymerizable acrylate monomer.

[0008] Secondly, embodiments of the present invention provide a water-blocking optical film.

[0009] The water-blocking optical film provided in this embodiment of the invention includes: a first phase difference compensation layer and any water-blocking layer provided in this embodiment of the invention. The first phase difference compensation layer and the water-blocking layer are stacked. The first phase difference compensation layer is disposed on the side of the substrate layer where the first auxiliary layer is provided. The water-blocking layer, the first phase difference compensation layer, the first auxiliary layer and the substrate layer are stacked sequentially.

[0010] Thirdly, embodiments of the present invention provide a method for preparing a water-blocking optical film.

[0011] The method for preparing a water-blocking optical film provided in this embodiment of the invention is used to prepare any one of the water-blocking optical films provided in this embodiment of the invention. The method for preparing a water-blocking optical film includes: forming a first phase difference compensation layer on one side of the substrate layer where a first auxiliary layer is provided; and curing to form a water-blocking layer.

[0012] Fourthly, embodiments of the present invention provide a polarizer.

[0013] The polarizer provided in this embodiment of the invention includes a polarizing film and any one of the water-blocking optical films provided in this embodiment of the invention.

[0014] Fifthly, embodiments of the present invention provide a display device.

[0015] The display device provided in this embodiment of the invention includes: a display screen and any type of polarizer provided in this embodiment of the invention.

[0016] The above-described at least one technical solution adopted in the embodiments of the present invention can achieve the following beneficial effects: In embodiments of the present invention, the water-blocking layer is polymerized from a polymerizable composition, which has the advantage of a smaller molding thickness compared to a cellulose triacetate membrane. It should be noted that, generally, the thickness of a cellulose triacetate membrane is typically 20 μm to 80 μm, while the thickness of the water-blocking layer polymerized from the polymerizable composition can be easily controlled below 20 μm. Therefore, by employing the solution provided in the embodiments of the present invention, the thickness of the water-blocking layer can be reduced. This, in turn, reduces the thickness of the polarizer with the water-blocking optical film. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a first type of water-blocking optical film configured with a water layer provided in an embodiment of the present invention; Figure 2 A schematic diagram of a first water-blocking optical film, a first auxiliary layer, and a substrate layer provided in an embodiment of the present invention; Figure 3 for Figure 2 The first water-blocking optical film in the diagram is a schematic diagram of the first structure; Figure 4for Figure 2 The first type of water-blocking optical film is a schematic diagram of the second structure; Figure 5 for Figure 2 The first type of water-blocking optical film in the diagram is a schematic diagram of the third structure; Figure 6 A schematic diagram of the second water-blocking optical film, the first auxiliary layer, and the substrate layer provided in an embodiment of the present invention; Figure 7 for Figure 6 The second type of water-blocking optical film in the diagram is a schematic diagram of the fourth structure; Figure 8 for Figure 6 The second type of water-blocking optical film in the diagram is a schematic diagram of the fifth structure; Figure 9 for Figure 6 The second type of water-blocking optical film in the diagram is a schematic diagram of the sixth structure; Figure 10 for Figure 6 The second type of water-blocking optical film is a schematic diagram of the seventh structure; Figure 11 A schematic diagram of the third type of water-blocking optical film, the first auxiliary layer, and the substrate layer provided in an embodiment of the present invention; Figure 12 for Figure 11 The third type of water-blocking optical film is a schematic diagram of the eighth structure; Figure 13 for Figure 11 The third type of water-blocking optical film is a schematic diagram of the ninth structure; Figure 14 for Figure 11 The third type of water-blocking optical film is a schematic diagram of the tenth structure; Figure 15 for Figure 11 The third type of water-blocking optical film is a schematic diagram of the eleventh structure; Figure 16 A schematic diagram of a twisted orientation phase difference compensation layer composed of a liquid crystal layer provided in an embodiment of the present invention; Figure 17 A flowchart illustrating a method for preparing a water-blocking optical film according to an embodiment of the present invention; Figure 18 A schematic diagram of the first type of polarizer provided in an embodiment of the present invention; Figure 19 This is a schematic diagram of a second type of polarizer provided in an embodiment of the present invention; Figure 20 This is a schematic diagram of a third type of polarizer provided in an embodiment of the present invention; Figure 21 This is a schematic diagram of the fourth type of polarizer provided in an embodiment of the present invention; Figure 22 This is a schematic diagram of the fifth type of polarizer provided in an embodiment of the present invention; Figure 23 A flowchart illustrating a method for preparing a polarizer according to an embodiment of the present invention; Figure 24 A schematic diagram of a display device provided in an embodiment of the present invention; Figure 25 Tables showing the composition and content of polymerizable compositions in various embodiments and comparative examples provided for the purposes of this invention; Figure 26 Test results of various embodiments and comparative examples provided for the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Furthermore, although the terminology used in this invention is selected from commonly known and used terms, some terms mentioned in this specification may have been selected by the inventor in his or her judgment, and their detailed meanings are explained in the relevant sections of the description herein.

[0022] Furthermore, the invention should be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0023] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] This invention provides a water-blocking layer. The water-blocking layer provided in this invention is polymerized from a polymerizable composition, wherein the polymerizable composition includes: organic / inorganic hybrid acrylate, polyurethane acrylate, and photopolymerizable acrylate monomer.

[0025] Organic / inorganic hybrid acrylates can reduce the porosity of the water-blocking layer. The inorganic portion of the organic / inorganic hybrid acrylate can form a hydrophobic structure, reducing water vapor permeability. Due to the presence of the inorganic portion in the organic / inorganic hybrid acrylate, a phase-separated structure can be formed, which can improve the aging resistance and hardness of the water-blocking layer. Polyurethane acrylates can improve the smoothness of the water-blocking layer. Photopolymerized acrylate monomers can adjust the volume shrinkage during water-blocking layer formation and the flexibility after film formation.

[0026] In this manner, in the embodiments of the present invention, the water-blocking layer is polymerized from a polymerizable composition, which has the advantage of a smaller molding thickness compared to a cellulose triacetate membrane. It should be noted that, generally, the thickness of a cellulose triacetate membrane is typically 20 μm to 80 μm, while the thickness of the water-blocking layer polymerized from the polymerizable composition can be easily controlled below 20 μm. Therefore, by adopting the solution provided in the embodiments of the present invention, the thickness of the water-blocking layer can be reduced. This, in turn, reduces the thickness of the polarizer on which the water-blocking optical film 100 is disposed.

[0027] In some embodiments, the polymerizable composition comprises, by mass fraction: 20% to 40% organic / inorganic hybrid acrylate, 20% to 30% polyurethane acrylate, 5% to 15% difunctional monomer acrylate, 5% to 10% trifunctional monomer acrylate and 5% to 10% monofunctional monomer acrylate.

[0028] In some embodiments, the organic / inorganic hybrid acrylate includes at least one of polysiloxane-grafted acrylate, silica-grafted acrylate, and polysilsesquioxane. The molecular weight of the organic / inorganic hybrid acrylate compound can be from 1,000 mol to 10,000 mol. Exemplarily, the molecular weight of the organic / inorganic hybrid acrylate compound can specifically be from 2,000 mol to 8,000 mol.

[0029] In some embodiments, the polymerizable composition further includes an initiator. The initiator may include one or more types. The initiator may be an initiator that initiates a photopolymerization reaction.

[0030] The initiator may specifically include, but is not limited to, any one or more of the following initiators: "Irgacure651", "Irgacure 184", "Darocur 1173", "Irgacure 907", "Irgacure127", "Irgacure 369", "Irgacure 379", "Irgacure" made by BASF Japan Co., Ltd. 819", "Irgacure2959", "Irgacure 1800", "Irgacure 250", "Irgacure 754", "Irgacure784", "Irgacure OXE01", "Irgacure OXE02", "Lucirin TPO", "Darocur 1173", "Darocur MBF"; "Esacure1001M", "Esacure KIP150", "Speedcure BEM", "SpeedcureBMS", "Speedcure MBP", "Speedcure" made by LAMBSON PBZ", "Speedcure ITX", "SpeedcureDETX", "Speedcure EBD", "Speedcure MBB", "Speedcure BP".

[0031] "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 Optomer N-1414", "Adeka Optomer N-1606", "Adeka Optomer N-1717", "Adeka Optomer N-1919", etc. manufactured by ADEKA Co., Ltd.

[0032] The amount of initiator added can be from 0.1% to 10% of the total mass of the polymerizable compound in the polymerizable composition, preferably from 0.5% to 7%, wherein the optimal amount is from 0.5% to 3%.

[0033] In one embodiment, the polymerizable composition further includes additives, including any one or more of surfactants, chain transfer agents, sensitizers, UV inhibitors, polymerization inhibitors, and antioxidants.

[0034] In embodiments of the present invention, surfactants, chain transfer agents, sensitizers, UV stabilizers, polymerization inhibitors, and antioxidants can be selectively added according to the actual formulation. Therefore, some or all of the surfactants, chain transfer agents, sensitizers, UV stabilizers, polymerization inhibitors, and antioxidants can be added.

[0035] Surfactants can prevent uneven film thickness when polymerizable compositions are formed into optical anisotropies. Surfactants may include any one or more of the following: 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.

[0036] Specifically, for example, "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" manufactured by DIC Co., Ltd. F-556", "Megafac F-557", "Megafac F-558", "MegafacF-559", "Megafac F-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".

[0037] For example, those manufactured by Noes Corporation: "Ftergent 100", "Ftergent 100C", "Ftergent 110", "Ftergent 150", "Ftergent 150CH", "Ftergent A", "Ftergent 100A-K", "Ftergent501", "Ftergent300", "Ftergent 310", "Ftergent 320", "Ftergent 400SW", "FTX-400P", "Ftergent251", "Ftergent 215M", "Ftergent 212MH", "Ftergent 250", "Ftergent222F", "Ftergent 212D", "FTX-218", "FTX-209F", "FTX-213F", "FTX-233F", "Ftergent245F", "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".

[0038] For example, those manufactured by BYK-Chemie Japan: "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-344", "BYK-370", "BYK-375", "BYK-377", "BYK-350", "BYK-352", "BYK-354", "BYK-355", "BYK-356", "BYK-358N", "BYK-361N", "BYK-357", "BYK-390", "BYK-392", "BYK-UV3500", "BYK-UV3510", "BYK-UV3570", "BYKSilclean3700".

[0039] For example, made by Tego: "TEGO Rad2100", "TEGO Rad2200N", "TEGO Rad2250", "TEGORad2300", "TEGORad2500", "TEGO Rad2600", "TEGO Rad2700".

[0040] For example, Solvay Solexis manufactures products such as "N215", "N535", "N605K", and "N935".

[0041] The amount of surfactant added can be from 0.01% to 2% of the total mass of the polymerizable compound in the polymerizable composition, preferably from 0.05% to 0.5%.

[0042] Chain transfer agents can improve the adhesion between the optical anisotropy obtained from the polymerizable composition and the substrate. The chain transfer agent can be a thiol compound, specifically including any one or more of monothiols, dithiols, trithiols, and tetrathiols. Trithiols are preferred.

[0043] The amount of chain transfer agent added can be 0.5% to 10% of the total mass of the polymerizable compound in the polymerizable composition, preferably 1.0% to 5.0%.

[0044] Sensitizers can improve the efficiency of polymerization reactions. Sensitizers can include any one or more of benzophenone and thioxanthone.

[0045] The amount of sensitizer added can be 0.1% to 3% of the total mass of the polymerizable compound in the polymerizable composition, and more preferably 0.2% to 2%.

[0046] UV absorbers are photostable stabilizers that primarily stabilize sunlight by absorbing and converting the destructive ultraviolet (UV) portion of the light. They are mainly used in plastic products, such as thicker materials like sheets, cables, and pipes. In many cases, UV absorbers are also added to plastic films to suppress or delay the negative effects of UV light on the protected items or materials. UV absorbers can include one or more of the following: benzophenones, salicylates, benzotriazoles, substituted acrylonitriles, and triazines. The amount of UV absorber added can be 0.1% to 2% of the total mass of the polymerizable compounds in the polymerizable composition, more preferably 0.1% to 1%.

[0047] In unsaturated compound systems, polymerization inhibitors preferentially react with free radicals to form non-radical substances or low-activity free radicals insufficient to initiate further polymerization, thus effectively inhibiting free radical chain polymerization. This has significant benefits for resin stability, storage, and transportation.

[0048] Polymerization inhibitors may include any one or more of the following: phenolic compounds, quinone compounds, amine compounds, thioether compounds, nitroso compounds, etc. Examples of 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.

[0049] Quinone compounds may include any one or more of the following: hydroquinone, methyl hydroquinone, tert-butyl hydroquinone, 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.

[0050] Amine compounds may include any one or more of the following: 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'-dicumyl-diphenylamine, 4,4'-dioctyl-diphenylamine, etc.

[0051] Thioether compounds may include any one or more of phenothiazines, distearate thiodipropionate, etc.

[0052] Nitrosyl compounds may include any one or more of the following: 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- 1-Hydroxyquinoline, N-nitrosomorpholine, N-nitroso-N-phenylhydroxyamine 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-sulfonate sodium salt, 2-nitroso-1-naphthol-4-sulfonate sodium salt, 2-nitroso-5-methylaminophenol hydrochloride, 2-nitroso-5-methylaminophenol hydrochloride, etc.

[0053] The amount of polymerization inhibitor added can be from 0.01% to 1.0% of the total mass of the polymerizable compound in the polymerizable composition, preferably from 0.05% to 0.5%.

[0054] Antioxidants can improve the stability of polymerizable compositions. Antioxidants may include one or more of hydroquinone derivatives, nitrosamine polymerization inhibitors, and hindered phenolic antioxidants.

[0055] Specifically, antioxidants may include any one or more of the following: tert-butylhydroquinone, methylhydroquinone, Wako Pure Chemical Industries Co., Ltd.'s "Q-1300" and "Q-1301", BASF's "IRGANOX1010", "IRGANOX1035", "IRGANOX1076", "IRGANOX1098", "IRGANOX1135", "IRGANOX1330", "IRGANOX1425", "IRGANOX1520", "IRGANOX1726", "IRGANOX245", "IRGANOX259", "IRGANOX3114", "IRGANOX3790", "IRGANOX5057", "IRGANOX565", etc.

[0056] The amount of antioxidant added can be from 0.01% to 2.0% of the total mass of the polymerizable compounds in the polymerizable composition, preferably from 0.05% to 1.0%.

[0057] In some embodiments, the thickness of the water-blocking layer 110 is less than 20 μm. For example, the thickness of the water-blocking layer 110 is 1 μm to 10 μm. Further, for example, the thickness of the water-blocking layer 110 is 1 μm to 5 μm. The water vapor transmission rate of the water-blocking layer 110 is 1 g / (m²). 2 • 24h) to 200g / (m 2 •24h).

[0058] This invention provides a water-blocking optical film. (See reference...) Figures 1 to 16 The water-blocking optical film 100 provided in this embodiment of the invention includes a first phase difference compensation layer 120 and any type of water-blocking layer 110 provided in this application embodiment. The first phase difference compensation layer 120 and the water-blocking layer 110 are stacked, with the first phase difference compensation layer 120 disposed on the side of the substrate layer 100a where the first auxiliary layer 100b is located. The water-blocking layer 110, the first phase difference compensation layer 120, the first auxiliary layer 100b, and the substrate layer 100a are stacked sequentially. In this way, the substrate layer 100a can be used as the molding base for the water-blocking layer 110 and the first phase difference compensation layer 120, etc.

[0059] It should be noted that, by way of example, the separately sold water-blocking optical film 100 can be in the form of a combination of the water-blocking optical film 100, the first auxiliary layer 100b, and the substrate layer 100a. The water-blocking optical film 100 can be applied to a polarizer. When the water-blocking optical film 100 is disposed on a polarizer, the substrate layer 100a can be removed. Alternatively, the substrate layer 100a and the first auxiliary layer 100b can be removed, or the first auxiliary layer 100b and the substrate layer 100a can be retained.

[0060] refer to Figures 3 to 5 In some embodiments, the first phase difference compensation layer 120 is a positive A phase difference compensation layer, a positive C phase difference compensation layer, or a twisted orientation phase difference compensation layer.

[0061] refer to Figure 3 In some embodiments, the first phase difference compensation layer 120 is a positive A phase difference compensation layer, and the first auxiliary layer 100b is an alignment layer.

[0062] It should be noted that the positive A-plate phase difference compensation layer can be formed from a positive A-plate. A positive A-plate is an optical compensation layer with its optical axis parallel to the thin film surface, often used to compensate for vertically aligned liquid crystal molecules to improve display viewing angle and contrast. The positive A-plate is prepared using a uniaxial stretching process, resulting in a material with a high refractive index in the plane (e.g., the x-direction), where the refractive index of the positive A-plate satisfies nx > ny = nz. For example, the liquid crystal in the positive A-plate consists of horizontally oriented rod-shaped molecules.

[0063] In a liquid crystal display device, the positive A plate and the alignment layer constitute an "orientation-compensation" synergistic system. The core relationship can be summarized as follows: the alignment layer determines the initial orientation state (pretilt angle) of the liquid crystal molecules, while the positive A plate dynamically compensates for the optical phase difference caused by this orientation. Together, they determine the display viewing angle, contrast ratio, and color shift performance.

[0064] refer to Figure 4 In some other embodiments, the first phase difference compensation layer 120 is a positive C phase difference compensation layer, and the first auxiliary layer 100b is a primer layer.

[0065] It should be noted that the positive C-plate phase difference compensation layer can be formed from a positive C-plate. A positive C-plate is an optical compensation layer whose optical axis is perpendicular to the film surface. This perpendicular orientation allows it to effectively compensate for phase difference distortion caused by the tilting of liquid crystal molecules in vertically aligned liquid crystals at wide viewing angles, especially suppressing light leakage in dark conditions and improving contrast and color stability. The refractive index of the positive C-plate satisfies nz > nx = ny. For example, the liquid crystal in the positive C-plate consists of vertically aligned rod-shaped molecules.

[0066] The positive C-plate and the bottom coating work together in the optical film structure. The positive C-plate provides phase difference compensation in the vertical direction, while the bottom coating provides initial alignment guidance for the liquid crystal layer. The combination of the two can achieve high-precision and wide-viewing-angle display performance optimization.

[0067] refer to Figure 5 In some other embodiments, the first phase difference compensation layer 120 is a twisted orientation phase difference compensation layer, and the first auxiliary layer 100b is an alignment layer. It should be noted that the twisted orientation liquid crystal phase difference compensation layer is a chiral doped nematic liquid crystal layer, and is also often referred to as the basic structure of a twisted nematic liquid crystal layer or a cholesteric liquid crystal layer.

[0068] refer to Figure 1 or Figure 2 In some embodiments, the water-blocking layer 110 is formed on the side of the first phase difference compensation layer 120 facing away from the first auxiliary layer 100b. Exemplarily, a polymerizable composition can be coated onto the side of the first phase difference compensation layer 120 facing away from the first auxiliary layer 100b, and then the polymerizable composition polymerizes and solidifies to form the water-blocking layer 110. This eliminates the need for an adhesive layer between the first phase difference compensation layer 120 and the water-blocking layer 110, thus saving the thickness occupied by the adhesive layer and achieving the effect of increasing the thickness of the water-blocking optical film 100, thereby reducing the thickness of the polarizer on which the water-blocking optical film 100 is disposed.

[0069] refer to Figure 6 or Figure 11In some embodiments, the water-blocking optical film further includes a second phase difference compensation layer 130. (See reference...) Figure 6 The second phase difference compensation layer 130 is disposed between the water-blocking layer 110 and the first phase difference compensation layer 120. Alternatively, refer to... Figure 11 The second phase difference compensation layer 130 is disposed on the side of the water-blocking layer 110 opposite to the first phase difference compensation layer 120. Thus, the first phase difference compensation layer 120 and the second phase difference compensation layer 130 work together to better compensate for the optical deviation of the polarizing film 200, improving the viewing angle and display clarity of the display device equipped with the polarizer. Therefore, by adding the second phase difference compensation layer 130, the functionality of the water-blocking optical film 100 can be further enhanced.

[0070] In some embodiments, when the first phase difference compensation layer 120 is a positive A-phase difference compensation layer, the second phase difference compensation layer 130 is a positive C-phase difference compensation layer or a twisted orientation phase difference compensation layer. When the first phase difference compensation layer 120 is a positive C-phase difference compensation layer, the second phase difference compensation layer 130 is a positive A-phase difference compensation layer or a twisted orientation phase difference compensation layer. When the first phase difference compensation layer 120 is a twisted orientation phase difference compensation layer, the second phase difference compensation layer 130 is a positive A-phase difference compensation layer, a positive C-phase difference compensation layer, or a twisted orientation phase difference compensation layer.

[0071] refer to Figure 6 In some embodiments, the water-blocking layer 110, the second phase difference compensation layer 130, the first phase difference compensation layer 120, the first auxiliary layer 100b, and the substrate layer 100a are stacked sequentially.

[0072] refer to Figure 7 The first phase difference compensation layer 120 is a positive A phase difference compensation layer or a twisted orientation phase difference compensation layer, the first auxiliary layer 100b is an alignment layer, and the second phase difference compensation layer 130 is a positive C phase difference compensation layer.

[0073] refer to Figure 8 The first phase difference compensation layer 120 is a positive C phase difference compensation layer, the first auxiliary layer 100b is a base layer, and the second phase difference compensation layer 130 is a positive A phase difference compensation layer or a twisted orientation phase difference compensation layer. A second auxiliary layer 140 is provided between the second phase difference compensation layer 130 and the first phase difference compensation layer 120, and the second auxiliary layer 140 is an alignment layer.

[0074] refer to Figure 9 The first phase difference compensation layer 120 is a twisted orientation phase difference compensation layer, the first auxiliary layer 100b is an alignment layer, and the second phase difference compensation layer 130 is a positive A phase difference compensation layer or a twisted orientation phase difference compensation layer. A second auxiliary layer 140 is provided between the second phase difference compensation layer 130 and the first phase difference compensation layer 120, and the second auxiliary layer 140 is an alignment layer.

[0075] refer to Figure 10 The first phase difference compensation layer 120 is a positive A phase difference compensation layer, the first auxiliary layer 100b is an alignment layer, and the second phase difference compensation layer 130 is a twisted orientation phase difference compensation layer. A second auxiliary layer 140, which is an alignment layer, is provided between the second phase difference compensation layer 130 and the first phase difference compensation layer 120.

[0076] refer to Figure 11 In some embodiments, the second phase difference compensation layer 130, the water-blocking layer 110, the first phase difference compensation layer 120, the first auxiliary layer 100b, and the substrate layer 100a are stacked sequentially.

[0077] refer to Figure 12 The first phase difference compensation layer 120 is a positive A phase difference compensation layer or a twisted orientation phase difference compensation layer, the first auxiliary layer 100b is an alignment layer, and the second phase difference compensation layer 130 is a positive C phase difference compensation layer.

[0078] refer to Figure 13 The first phase difference compensation layer 120 is a positive C phase difference compensation layer, the first auxiliary layer 100b is a base layer, and the second phase difference compensation layer 130 is a positive A phase difference compensation layer or a twisted orientation phase difference compensation layer. A second auxiliary layer 140 is provided between the second phase difference compensation layer 130 and the water-blocking layer 110, and the second auxiliary layer 140 is an alignment layer.

[0079] refer to Figure 14 The first phase difference compensation layer 120 is a twisted orientation phase difference compensation layer, the first auxiliary layer 100b is an alignment layer, and the second phase difference compensation layer 130 is a positive A phase difference compensation layer or a twisted orientation phase difference compensation layer. A second auxiliary layer 140, which is an alignment layer, is provided between the second phase difference compensation layer 130 and the water-blocking layer 110.

[0080] refer to Figure 15 The first phase difference compensation layer 120 is a positive A phase difference compensation layer, the first auxiliary layer 100b is an alignment layer, and the second phase difference compensation layer 130 is a twisted orientation phase difference compensation layer. A second auxiliary layer 140, which is an alignment layer, is provided between the second phase difference compensation layer 130 and the water-blocking layer 110.

[0081] It should be noted that the previous embodiments provided cases where the phase difference compensation layer of the water-blocking optical film 100 only includes a positive A phase difference compensation layer or only includes a positive C phase difference compensation layer. However, in this embodiment, the phase difference compensation layer of the water-blocking optical film 100 can include both a positive A phase difference compensation layer and a positive C phase difference compensation layer. The positions of the positive A phase difference compensation layer and the positive C phase difference compensation layer are not limited, and their positions can be interchanged. In this way, by combining the positive A phase difference compensation layer and the positive C phase difference compensation layer, the functionality of the water-blocking optical film 100 can be increased.

[0082] In some embodiments, when one of the first phase difference compensation layer 120 and the second phase difference compensation layer 130 is a positive A phase difference compensation layer, the thickness of the positive A phase difference compensation layer is less than or equal to 10 μm; the phase difference of the positive A phase difference compensation layer satisfies: 50 nm ≤ Re(550) ≤ 200 nm, 25 nm ≤ Rth(550) ≤ 100 nm. In a preferred embodiment, the phase difference of the positive A phase difference compensation layer satisfies: 100 nm ≤ Re(550) ≤ 160 nm, 50 nm ≤ Rth(550) ≤ 80 nm.

[0083] It should be noted that Re(550) is the in-plane phase difference of the phase difference compensation layer. Re(550) reflects the phase delay caused by the difference in refractive index in the film plane (x-axis and y-axis directions) under 550nm light illumination. Rth(550) is the thickness-direction phase difference of the phase difference compensation layer. Rth(550) represents the thickness-direction phase difference of the phase difference compensation layer measured under 550nm light illumination.

[0084] In some embodiments, when one of the first phase difference compensation layer 120 and the second phase difference compensation layer 130 is a positive C phase difference compensation layer, the thickness of the positive C phase difference compensation layer is less than or equal to 5 μm; the phase difference of the positive C phase difference compensation layer satisfies: Re(550) ≤ 10 nm, -300 nm ≤ Rth(550) ≤ -50 nm. In a preferred embodiment, the phase difference of the positive C phase difference compensation layer satisfies: Re(550) ≤ 10 nm, -110 nm ≤ Rth(550) ≤ -50 nm.

[0085] When the first phase difference compensation layer 120 is a twisted orientation phase difference compensation layer, the twisted orientation phase difference compensation layer is composed of a liquid crystal layer. The liquid crystal layer includes a first sublayer 121, a second sublayer 122, and a third sublayer 123 stacked sequentially. The first sublayer 121 is located on the side of the second sublayer 122 facing the first auxiliary layer 100b. The first auxiliary layer 100b is an alignment layer, which is used to align the liquid crystal of the first sublayer 121 based on a preset alignment angle. The second sublayer 122 is a helical structure with a preset helical angle. The liquid crystal alignment angle of the third sublayer 123 is determined by the preset alignment angle of the first sublayer 121 and the preset helical angle of the second sublayer 122.

[0086] The liquid crystal layer is used to convert linearly polarized light into circularly polarized light through the helical structure of the second sublayer 122. The liquid crystal layer includes negatively distributed liquid crystal, and the birefringence of the liquid crystal layer does not decrease with the increase of visible light wavelength. The preset helical angle of the second sublayer 122 and the target retardation of the liquid crystal layer are determined based on the preset alignment angle of the first sublayer 121 and the wavelength of light in a preset wavelength band. The ratio of the wavelength of light in each visible light band included in the preset wavelength band to the corresponding first retardation is within a preset ratio range, and the first retardation is the retardation corresponding to the visible light band in the target retardation.

[0087] The preset angle can be a helical angle determined according to the actual alignment requirements. The rotation direction of the helical structure can be a top-down rotation direction. The helical structure can be achieved by adding a chiral agent to the opposing phase liquid crystal. In addition, there are many other ways to achieve this. The embodiments of the present invention do not specifically limit this.

[0088] In some embodiments, the liquid crystal in the twisted orientation phase difference compensation layer is a horizontally oriented rod-shaped molecule. The liquid crystal in the twisted orientation phase difference compensation layer can be a positively dispersed liquid crystal, wherein the phase difference of the liquid crystal in the twisted orientation phase difference compensation layer satisfies: Re(450) > Re(550) > Re(650). The liquid crystal in the twisted orientation phase difference compensation layer can also be a negatively dispersed liquid crystal, wherein the phase difference of the liquid crystal in the twisted orientation phase difference compensation layer satisfies: Re(450) <Re(550)<Re(650)。

[0089] It should be noted that Re(450) is the in-plane phase difference of the phase difference compensation layer. Re(450) reflects the phase delay caused by the difference in refractive index in the film plane (x-axis and y-axis directions) under 450nm light illumination. Re(650) is the in-plane phase difference of the phase difference compensation layer. Re(650) reflects the phase delay caused by the difference in refractive index in the film plane (x-axis and y-axis directions) under 650nm light illumination.

[0090] In the alignment layer, the liquid crystal in the liquid crystal layer is aligned based on a preset alignment angle. Based on a preset parameter determination method, the helix angle of the liquid crystal layer and the target retardation amount of the liquid crystal layer in the preset wavelength band are determined according to the preset alignment angle and the wavelength of light in the preset wavelength band. This is to convert linearly polarized light into circularly polarized light that meets the light conversion requirements in the preset wavelength band under the action of the liquid crystal layer. Based on the preset alignment angle, helix angle and wavelength of light in the preset wavelength band, the target retardation amount of the liquid crystal layer in the preset wavelength band is determined by a preset retardation amount determination method.

[0091] For example, the first sublayer 121 has a preset alignment angle adjacent to the alignment layer, the second sublayer 122 has a helical structure with a preset helical angle, and the liquid crystal alignment angle of the third sublayer 123 is determined by the preset alignment angle and the preset helical angle. The liquid crystal layer is used to convert linearly polarized light into circularly polarized light through the helical structure of the second sublayer 122. The preset helical angle of the second sublayer 122 can have the same sign as the preset alignment angle of the first sublayer 121. Furthermore, to achieve the helical structure of the second sublayer 122, a chiral agent can be added to the anti-parallel liquid crystal. There are also various other implementation methods, which are not specifically limited in this embodiment of the invention.

[0092] For example, if the preset alignment angle of the first sublayer 121 can be any angle from 0 degrees to 45 degrees, then the preset helical angle of the second sublayer 122 can be any angle from 0 degrees to 70 degrees. If the preset alignment angle of the first sublayer 121 is 30 degrees, then the preset helical angle of the second sublayer 122 can be 23 degrees. Then the liquid crystal alignment angle of the corresponding third sublayer 123 = preset alignment angle + helical angle = 30 degrees + 23 degrees = 53 degrees.

[0093] The helical angle of the second sublayer 122 and the target retardation of the liquid crystal layer can be determined based on the alignment angle of the first sublayer 121 and the wavelength of light in a preset band. For example, after determining the preset alignment angle of the first sublayer 121, the preset helical angle of the corresponding second sublayer 122 can be determined based on the preset alignment angle. After determining the preset helical angle, the target retardation of the liquid crystal layer can be determined based on the preset alignment angle of the first sublayer 121, the preset helical angle of the second sublayer 122, and the wavelength of light in a preset band. That is, the target retardation of the liquid crystal layer can be determined based on the alignment angle of the first sublayer 121, the helical angle of the second sublayer 122, and the wavelength of light in a preset band.

[0094] For example, the preset alignment angle of the first sublayer 121 can be any angle between 25 degrees and 35 degrees, the preset helical angle of the second sublayer 122 can be any angle between 20 degrees and 25 degrees, the preset wavelength can be the 550nm wavelength, and the target delay can be any delay between 135nm and 150nm or between 140nm and 145nm. For example, the preset alignment angle of the first sublayer 121 can be 30 degrees, the preset helical angle of the second sublayer 122 can be 23 degrees, the liquid crystal alignment angle of the third sublayer 123 can be 53 degrees, and the target delay can be 140nm.

[0095] Alternatively, the preset alignment angle of the first sublayer 121 can be any angle between 5 and 15 degrees, the preset helical angle of the second sublayer 122 can be any angle between 45 and 55 degrees, the preset wavelength can be the 550nm wavelength, and the target delay can be any delay between 150nm and 180nm or between 165nm and 170nm. For example, the preset alignment angle of the first sublayer 121 can be 10 degrees, the preset helical angle of the second sublayer 122 can be 52 degrees, the liquid crystal alignment angle of the third sublayer 123 can be 62 degrees, and the target delay can be 165nm.

[0096] Alternatively, the preset alignment angle of the first sublayer 121 can be any angle between 0 and 5 degrees, the preset helical angle of the second sublayer 122 can be any angle between 60 and 65 degrees, the preset wavelength can be the 550nm band, and the target delay can be any delay between 180nm and 200nm or between 110nm and 198nm. For example, the preset alignment angle of the first sublayer 121 can be 0 degrees, the preset helical angle of the second sublayer 122 can be 63 degrees, the liquid crystal alignment angle of the third sublayer 123 can be 63 degrees, and the target delay can be 110nm.

[0097] In some embodiments, the thickness of the water-blocking layer 110 is less than 20 μm. Preferably, the thickness of the water-blocking layer 110 is 1 μm to 5 μm. The water vapor transmission rate of the water-blocking layer 110 is 1 g / (m²·24h) to 200 g / (m²·24h) (25 degrees Celsius, 85% relative humidity). The water-blocking layer 110 has excellent hydrophobicity and water-blocking properties, effectively preventing moisture from penetrating into the polarizing film 200.

[0098] In some embodiments, the substrate layer 100a may be made of materials such as polyethylene terephthalate (PET), cellulose triacetate (TAC), and polymethyl methacrylate (PMMA). The substrate layer 100a is preferably made of polyethylene terephthalate. The thickness of the substrate layer 100a is 50 μm to 100 μm.

[0099] In some embodiments, the thickness of the first auxiliary layer 100b is less than or equal to 10 μm. The first auxiliary layer 100b is a peelable layer. The peel force between the first auxiliary layer 100b and the first phase difference compensation layer 120 or the substrate layer 100a is less than or equal to 15 N / 25 mm. Here, N / 25 mm is a unit of peel force. The peel force between the first auxiliary layer 100b and the first phase difference compensation layer 120 or the substrate layer 100a is preferably 5 to 10 N / 25 mm, enabling non-destructive peeling of the "first phase difference compensation layer 120 + water-blocking layer 110" from the substrate layer 100a. After the peeling process, the first auxiliary layer 100b can be selectively retained on the surface of the substrate layer 100a or on the water-blocking optical film 100. In other embodiments, the first auxiliary layer 100b may also be a non-peelable layer.

[0100] In some embodiments, the photopolymerizable acrylate monomer includes at least one of dimeric functional group monomer acrylate, trimeric functional group monomer acrylate, and monofunctional group monomer acrylate.

[0101] For example, the monofunctional monomeric acrylate includes at least one of the dimeric functional monomeric acrylate, the trimeric functional monomeric acrylate, and the monofunctional monomeric acrylate.

[0102] In the case of photopolymerizable acrylate monomers including dimerizable functional group acrylate monomers, dimerizable functional group acrylate monomers are mainly used to adjust the volume shrinkage during film formation and the flexibility after film formation, so as to prevent the film surface from being too brittle or having insufficient adhesion.

[0103] In the case of photopolymerizable acrylate monomers including tripolymerizable functional group acrylate monomers, the tripolymerizable functional group acrylate monomers mainly adjust the crosslinking density and improve the reliability after film formation.

[0104] It should be noted that monofunctional acrylate monomers are mainly acrylic monomers containing alkyl chains. When photopolymerized acrylate monomers include monofunctional acrylate monomers, the hydrophobicity and water vapor permeability of the film can be adjusted by regulating the number of alkyl chains.

[0105] In some embodiments, the polymerizable composition comprises, by mass fraction: 20% to 40% organic / inorganic hybrid acrylate, 20% to 30% polyurethane acrylate, 5% to 15% difunctional monomer acrylate, 5% to 10% trifunctional monomer acrylate and 5% to 10% monofunctional monomer acrylate.

[0106] In embodiments of the present invention, the polymerizable composition further includes an initiator. The initiator may include one or more. The initiator may be an initiator that initiates a photopolymerization reaction. The amount of initiator added may be 0.1% to 10% of the total mass of the polymerizable compound in the polymerizable composition, preferably 0.5% to 7%. A more preferred amount is 0.5% to 3%.

[0107] In some embodiments, the polymerizable composition further includes additives. Additives include any one or more of surfactants, chain transfer agents, sensitizers, UV stabilizers, polymerization inhibitors, and antioxidants. It should be noted that surfactants, chain transfer agents, sensitizers, UV stabilizers, polymerization inhibitors, and antioxidants can be selectively added based on the specific formulation requirements. Therefore, some or all of the surfactants, chain transfer agents, sensitizers, UV stabilizers, polymerization inhibitors, and antioxidants can be added.

[0108] Based on the polymerizable composition formed by mixing the above compounds, a water-blocking layer 110 is formed by coating the side of the substrate layer 100a with the first auxiliary layer 100b and then going through a series of processes, so that the formed water-blocking optical film 100 has the function of preventing water vapor from passing through.

[0109] This invention provides a method for preparing a water-blocking optical film, used to prepare any one of the water-blocking optical films 100 provided in this invention. (Reference) Figures 1 to 17 The method for preparing the water-blocking optical film 100 provided in this embodiment of the invention includes: Step 1010: Form a first phase difference compensation layer on the side of the substrate layer where the first auxiliary layer is provided.

[0110] Prior to this, the substrate layer 100a can be pretreated. In some embodiments, the substrate layer 100a can be degreased, washed, and dried to obtain a clean substrate layer 100a. Then, a first auxiliary layer 100b can be formed on the surface of the substrate layer 100a. In some embodiments, the raw materials used to make the first auxiliary layer 100b can be mixed evenly and then coated onto the surface of the pretreated substrate layer 100a. After drying, photocuring, and other processes, the raw materials coated onto the surface of the substrate layer 100a form the first auxiliary layer 100b.

[0111] After obtaining the substrate layer 100a with the first auxiliary layer 100b, a first phase difference compensation layer 120 can be formed on the side of the substrate layer 100b with the first auxiliary layer 100b. The first phase difference compensation layer 120 is a phase difference compensation layer.

[0112] In some embodiments, the liquid crystal compound solution can be directly and uniformly coated on the surface of the first auxiliary layer 100b, and then dried and cured to form an optical compensation layer.

[0113] In some embodiments, a positive A-phase décor compensation layer can be applied first, followed by a positive C-phase décor compensation layer. Alternatively, a positive C-phase décor compensation layer can be applied first, followed by a positive A-phase décor compensation layer. Alternatively, only a single optical compensation layer can be applied; for example, only a positive A-phase décor compensation layer or only a positive C-phase décor compensation layer can be applied. If multiple phase décor compensation layers are applied, the contact between the layers is always direct coating. Furthermore, it is understood that an alignment layer or a base coat can be applied below the positive A-phase décor compensation layer or the positive C-phase décor compensation layer as needed.

[0114] Step 1020: Curing and shaping the water-blocking layer.

[0115] In embodiments of the present invention, a water-blocking layer 110 can be formed based on the film layer obtained in the previous step. In some embodiments, the liquid of the polymerizable composition used to form the water-blocking layer 110 can be mixed evenly, then coated on the surface of the optical compensation layer, and the water-blocking layer 110 can be formed after drying and curing.

[0116] In some embodiments, a water-blocking layer 110 may be formed on the side of the first phase difference compensation layer 120 opposite to the substrate layer 100a. Alternatively, in step 1010, a second phase difference compensation layer 130 may be formed first on the side of the first phase difference compensation layer 120 opposite to the substrate layer 100a, and in step 1020, a water-blocking layer 110 may be formed on the side of the second phase difference compensation layer 130 opposite to the substrate layer 100a.

[0117] In some embodiments, the water barrier layer 110 is polymerized from a polymerizable composition, wherein the polymerizable composition includes: organic / inorganic hybrid acrylate, polyurethane acrylate, photopolymerizable acrylate monomer and initiator.

[0118] In some embodiments, the polymerizable composition comprises, by mass fraction: 20% to 40% organic / inorganic hybrid acrylate, 20% to 30% polyurethane acrylate, 5% to 15% difunctional monomer acrylate, 5% to 10% trifunctional monomer acrylate and 5% to 10% monofunctional monomer acrylate.

[0119] In some embodiments, the amount of initiator added can be 0.1% to 10% of the total mass of the polymerizable compound in the polymerizable composition, preferably 0.5% to 7%. The optimal amount added is 0.5% to 3%.

[0120] In some embodiments, the polymerizable composition may be mixed with a solvent to obtain a polymerizable composition solution. Exemplarily, the solvent may be an organic solvent, and preferably an organic solvent that can evaporate and dry at a temperature below 80 degrees Celsius.

[0121] The solvent may include any one or more of the following: 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. From the perspective of solution stability, ketone solvents, ether solvents, ester solvents, and aromatic hydrocarbon solvents are preferred.

[0122] There are no particular limitations on the amount of solvent added, as long as it does not significantly damage the coating. In the polymerizable composition solution, the solvent content is 30% to 95% by mass, more preferably 40% to 90%.

[0123] When dissolving the polymerizable composition in a solvent, heating and stirring are preferred to ensure uniform dissolution. The heating and stirring temperature can be adjusted according to the solubility of the polymerizable composition in the solvent. From the perspective of production efficiency, a temperature of 15°C to 110°C is preferred, more preferably 15°C to 105°C, even more preferably 15°C to 100°C, and particularly preferably 20°C to 60°C.

[0124] After preparing the polymerizable composition solution, the polymerizable composition solution can be coated onto the side of the substrate layer 100b where the first auxiliary layer 100b is provided, and then dried to obtain the polymerizable composition resin layer.

[0125] Substrate layer 100b is made of a vertically oriented film. Substrate layer 100b is used to support the polymerizable composition solution. The material of substrate layer 100b is heat-resistant, so that the performance of substrate layer 100b will not be affected when the polymerizable composition solution coated on its surface is subsequently heated and dried.

[0126] The polymerizable composition solution can be coated onto the surface of the substrate layer 100b using coating methods such as applicator coating, bar coating, spin coating, roller coating, direct gravure coating, reverse gravure coating, flexo coating, inkjet coating, die coating, cap coating, dip coating, and slot coating.

[0127] The substrate layer 100b coated with the polymerizable composition solution can be placed in a forced-air drying oven at 70 to 90 degrees Celsius and dried for 60 to 80 seconds to obtain the polymerizable composition resin layer.

[0128] Furthermore, the polymerizable resin layer can be irradiated to obtain a water-blocking layer 110. This can be achieved by irradiating the polymerizable resin layer with visible or ultraviolet light. Specifically, irradiation with ultraviolet light below 390 nm is preferred, and irradiation with light of wavelengths between 250 and 370 nm is more preferable. The light irradiating the polymerizable resin layer is preferably unpolarized light. Under light irradiation, the polymerizable resin layer undergoes photopolymerization, thereby obtaining the water-blocking layer 110.

[0129] In addition, the water-blocking optical film 10 prepared by the simple preparation method of coating and light irradiation in the above embodiments can replace the triacetate cellulose film in traditional polarizers, which can effectively simplify the manufacturing process and raw material cost of polarizers, thereby improving production efficiency and reducing production costs.

[0130] This invention provides a polarizer. (See reference...) Figures 18 to 22 The polarizer 10 provided in this embodiment of the invention includes: a polarizing film 200 and any one of the water-blocking optical films 100 provided in this embodiment of the invention.

[0131] In some embodiments, the polarizer 10 further includes a cellulose triacetate film 300. The water-blocking optical film 100, the polarizing film 200, and the cellulose triacetate film 300 are sequentially stacked, with the water-blocking layer 110 located on the side of the first phase difference compensation layer 120 facing the polarizing film 200. Thus, the protective film on one side of the polarizing film 200 is the cellulose triacetate (TAC) film 300, and the protective film on the other side is the water-blocking layer 110.

[0132] In some embodiments, the first auxiliary layer 100b is a peelable layer. The substrate layer 100a and the first auxiliary layer 100b can be peeled off. The water-blocking layer 110 of the water-blocking optical film 100 can be bonded to the surface of the polarizing film 200 via the first adhesive layer 410. The cellulose triacetate film 300 can be bonded to the surface of the polarizing film 200 via the second adhesive layer 420.

[0133] Furthermore, a release film 510 can be provided on the surface of the first phase difference compensation layer 120 of the water-blocking optical film 100, and a protective film 520 can be provided on the surface of the triacetate cellulose film 300. During the use of the polarizer 10, the release film 510 can be removed first, thereby attaching the polarizer 10 to the surface of the display screen. Then, the protective film 520 can be removed.

[0134] In some embodiments, the thickness of the water-blocking layer 110 is 1 μm to 5 μm, and the water vapor transmission rate of the water-blocking layer 110 is 1 g / (m²). 2• 24h) to 200g / (m 2 • 24h (25 degrees Celsius, 85% relative humidity). The water-blocking layer 110 has excellent hydrophobicity and water-blocking properties, which can effectively prevent moisture from penetrating into the polarizing film 200.

[0135] In some embodiments, the thickness of the triacetate cellulose (TAC) film 300 is 25 μm to 40 μm. The thickness of the polarizing film 200 is 5 μm to 20 μm. The polarizing film 200 can be dyed and stretched, and the polarizing film 200 has good polarization characteristics.

[0136] refer to Figure 2 , Figures 18 to 20 In some embodiments, the first auxiliary layer 100b is a peelable layer, meaning that the first auxiliary layer 100b and the substrate layer 100a on the surface of the water-blocking optical film 100 can be removed by peeling the first auxiliary layer 100b together with the substrate layer 100a. (See reference...) Figure 2 , Figure 21 and Figure 22 In some embodiments, the first auxiliary layer 100b is a non-removable layer, thereby allowing the first auxiliary layer 100b and the substrate layer 100a to remain on the surface of the water-blocking optical film 100.

[0137] By employing the solution provided in this embodiment of the invention, a water-blocking optical film 100 can be used to replace the triacetyl cellulose film on one side of the polarizer 10 in related technologies, thereby reducing the thickness of the polarizer 10. In some embodiments, the thickness of the water-blocking layer 110 is 1µm to 5µm, and the overall thickness of the polarizer 10 is much lower than that of polarizers in related technologies where triacetyl cellulose films are respectively provided on both sides of the polarizer. Therefore, the overall thickness of the polarizer 10 can be effectively reduced, which is beneficial to the thinning development of display devices and meets the needs of ultra-thin display products such as mobile phones and tablet computers.

[0138] The water-blocking layer 110 has good water-blocking properties, which can improve the stability of the polarizer 10. The water-blocking performance of the water-blocking layer 110 is better than that of traditional triacetate cellulose membranes. It can effectively prevent moisture from penetrating into the polarizer 200, avoid swelling and deformation of the polarizer 200, and extend the service life of the polarizer 10. It is especially suitable for high humidity environments.

[0139] The solution provided by the embodiments of the present invention can reduce costs and simplify the process. The water-blocking layer 110 and the first auxiliary layer 100b provided by the embodiments of the present invention have low raw material costs and simple processing technology. Moreover, the integrated design of "optical compensation layer + water-blocking layer" can replace the traditional separate setting of triacetate cellulose film and optical compensation layer, simplifying the processing steps of polarizer 10 and significantly reducing the production cost of polarizer 10.

[0140] The polarizer 10 provided in this embodiment of the invention has the advantage of convenient interlayer peeling, which can improve the product qualification rate. The peeling force of the first auxiliary layer 100b is controllable, which can realize the non-destructive peeling of the "optical compensation layer + water-blocking layer" from the substrate layer, avoid damage to the functional layer during the peeling process, and improve the product qualification rate.

[0141] The polarizer 10 provided in this embodiment of the invention has the advantage of excellent optical performance. The in-plane retardation of the optical compensation layer is controllable, which can effectively compensate for the optical deviation of the polarizer 200 and improve the viewing angle and display clarity of the display device. Each film layer has good optical transparency, with a transmittance of ≥90%, which does not affect the display effect.

[0142] The polarizer 10 provided in this embodiment of the invention has a water-blocking layer and an optical compensation layer (A plate and / or C plate) that are directly coated in contact, which simplifies the process and improves the yield.

[0143] This invention provides a method for preparing a polarizer, used to prepare any type of polarizer 10 provided in this invention. (Reference) Figures 1 to 23 In some embodiments, the method for preparing the polarizer 10 provided in this invention includes: Step 1110: Apply the water-blocking optical film to one side of the polarizing film.

[0144] Step 1120: Attach the cellulose triacetate membrane to the side of the polarizing film that is away from the water-blocking optical film.

[0145] In the embodiments of this application, the water-blocking optical film 100 can be first attached to one side of the polarizing film 200. Then, the triacetate cellulose film 300 can be attached to the side of the polarizing film 200 opposite to the water-blocking optical film 100.

[0146] In some embodiments, the water-blocking optical film 100 is formed on the surface of the substrate layer 100a. The substrate layer 100a mainly serves as the base for forming the water-blocking optical film 100. In subsequent use of the water-blocking optical film 100, the substrate layer 100a can be removed first. In some embodiments, the first auxiliary layer 100b can be separated from the first phase difference compensation layer 120 by a transfer-type peeling method, or the first auxiliary layer 100b can be separated from the substrate layer 100a.

[0147] In some embodiments, a water-blocking optical film 100 with the substrate layer 100a removed can be bonded to one side of the polarizing film 200. Alternatively, a cellulose triacetate film 300 can be bonded to the other side of the polarizing film 200.

[0148] In addition, a release film 510 can be provided on the surface of the first phase difference compensation layer 120 of the water-blocking optical film 100, and a protective film 520 can be provided on the surface of the cellulose triacetate film 300.

[0149] This invention provides a display device. (See reference...) Figure 24 The display device 1 provided in this embodiment of the invention includes: a display screen 20 and any type of polarizer 10 provided in this embodiment of the invention. Exemplarily, a polarizing film 200 and a water-blocking optical film 100 are stacked. Exemplarily, the polarizing film 200 and the water-blocking optical film 100 can be bonded together with adhesive or double-sided adhesive.

[0150] For example, the display screen 20 can be an active matrix display device or a passive matrix display screen. Further, the display screen can be an active matrix addressed liquid crystal display screen or an organic light-emitting diode (OLED) display screen.

[0151] To facilitate the explanation of the solutions provided in the embodiments of the present invention, the following description will be based on specific embodiments, comparative examples, and corresponding test data.

[0152] In the following embodiments, unless otherwise specified, all raw materials used are available from publicly available commercial sources. Percentages refer to mass percentages, temperatures are in degrees Celsius (°C), and the specific meanings and test conditions of other symbols are as follows: Adhesion performance testing was conducted using the cross-cut adhesion test with SM600 tape. Adhesion performance grades included: 5B: no peeling (100% adhesion), the highest grade; 4B: peeling area ≤5%, meeting the requirements for most industrial scenarios; 0B: peeling area >65%, considered seriously unacceptable. Yellowing value was measured according to ASTM E313; water vapor transmission rate according to ASTM E96; high temperature and humidity reliability testing was conducted using a constant temperature and humidity chamber; UV aging was performed using a UV aging lamp chamber.

[0153] As a preferred embodiment, the materials used in the experiment are as follows; Organic / inorganic hybrid acrylates: M1: Changxing Chemical 601Q35.

[0154] M2: Polysilsesquioxane acrylate (homemade).

[0155] Difunctional monomer acrylate: M3: Tripropylene glycol diacrylate (TRPGDA).

[0156] M4: Polyethylene glycol 400 acrylate (PEG(400)DA).

[0157] Trifunctional acrylate monomers and photopolymerizable acrylate monomers with more than three functional groups: M5: EM2380.

[0158] M6: EM265.

[0159] Multifunctional monomer acrylates: M7: 6215-100C; Monofunctional monomeric acrylates: M8: Dodecyl acrylate.

[0160] M9: Hexadecyl acrylate.

[0161] Photoinitiator: 184, 1173 (HMPP).

[0162] Additive: 361N.

[0163] Solvents: Methyl isobutyl ketone (MIBK), butanone (MEK).

[0164] Examples 1 to 12, according to Figure 25 The table shows the composition and content of the polymerizable composition solution and the method described below for preparing the optical film.

[0165] The preparation method of the polymerizable composition solution is as follows: Mix the components according to... Figure 25 After weighing the contents shown in the table, place them in a brown bottle, add solvent, and stir on a magnetic stirrer for 1 hour until the mixture is homogeneous to obtain a polymerizable composition solution.

[0166] The preparation method of the water-blocking layer is as follows: First, a polymerizable composition solution is prepared according to the above method. Then, the polymerizable composition solution is scraped onto a vertically aligned liquid crystal film using 10#, 20#, and 25# malt sticks at a speed of 10 cm / s. The scraped sample is then dried in a forced-air drying oven at 80°C for 60 seconds. Finally, the sample is dried at room temperature using a wavelength of 365 nm and an irradiance of 30 Mw / cm². 2 The optical film was obtained by UV curing for 60 seconds. Adhesion, water permeability, yellowness, UV aging, and high-temperature and high-humidity aging tests were performed on the prepared optical film (85℃ / 85%, 1000h). The test results are shown in [Table missing]. Figure 26 .

[0167] Comparative Examples 1 to 5 were performed using the same method as in Examples 1 to 12, according to... Figure 25 The polymerizable composition solution was prepared according to the proportions shown in the table, and optical films were prepared under otherwise unchanged conditions. Adhesion, water vapor transmittance, yellowness, UV aging, and high-temperature and high-humidity aging (85℃ / 85%, 1000h) were then tested. The results are shown in [Table data missing]. Figure 26 .

[0168] The test results of each example and Comparative Example 1 and Comparative Example 2 show that the initial moisture permeability of the formulation without added organic / inorganic hybrid acrylate is greater than 200 g / (m³). 2• 24h). Although Comparative Examples 3, 4, and 5 contain formulations with organic / inorganic hybrid acrylates, the initial moisture permeability can reach 200 g / (m²). 2 • 24h), but after aging, the moisture permeability increases to more than 200g / (m 2 (24h). Furthermore, a comparison of Examples 2 and 3, Examples 6 and 7, and Examples 10 and 11 revealed that the addition of monofunctional long alkyl chain monomers helps improve both initial water-blocking performance and water-blocking performance after aging.

[0169] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0170] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the embodiments of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water-blocking layer, characterized in that, The water-blocking layer is polymerized from a polymerizable composition, wherein the polymerizable composition includes: organic / inorganic hybrid acrylate, polyurethane acrylate, and photopolymerizable acrylate monomer.

2. The water-blocking layer according to claim 1, characterized in that, The polymerizable composition comprises, by mass fraction: 20% to 40% organic / inorganic hybrid acrylate, 20% to 30% polyurethane acrylate, 5% to 15% difunctional monomer acrylate, 5% to 10% trifunctional monomer acrylate and 5% to 10% monofunctional monomer acrylate.

3. The water-blocking layer according to claim 1, characterized in that, The organic / inorganic hybrid acrylate includes at least one of polysiloxane-grafted acrylate, silica-grafted acrylate, and polysilsesquioxane.

4. The water-blocking layer according to claim 1, characterized in that, The water barrier layer has a thickness of less than 20 um, and a water vapor transmission rate of 1 g / (m 2 ·24h) to 200 g / (m 2 ·24h).

5. A water-blocking optical film, characterized in that, include: The first phase difference compensation layer (120) and the water-blocking layer according to any one of claims 1 to 4 are stacked together. The first phase difference compensation layer (120) is disposed on the side of the substrate layer (100a) where the first auxiliary layer (100b) is provided. The water-blocking layer, the first phase difference compensation layer (120), the first auxiliary layer (100b) and the substrate layer (100a) are stacked sequentially.

6. The water-blocking optical film according to claim 5, characterized in that, The first phase difference compensation layer (120) is a positive A phase difference compensation layer, a positive C phase difference compensation layer, or a twisted orientation phase difference compensation layer.

7. The water-blocking optical film according to claim 5, characterized in that, The water-blocking optical film also includes a second phase difference compensation layer (130). The second phase difference compensation layer (130) is disposed between the water-blocking layer and the first phase difference compensation layer (120), or the second phase difference compensation layer (130) is disposed on the side of the water-blocking layer away from the first phase difference compensation layer (120); When the first phase difference compensation layer (120) is a positive A phase difference compensation layer, the second phase difference compensation layer (130) is a positive C phase difference compensation layer or a twisted orientation phase difference compensation layer; When the first phase difference compensation layer (120) is a positive C phase difference compensation layer, the second phase difference compensation layer (130) is a positive A phase difference compensation layer or a twisted orientation phase difference compensation layer; When the first phase difference compensation layer (120) is a twisted orientation phase difference compensation layer, the second phase difference compensation layer (130) is a positive A phase difference compensation layer, a positive C phase difference compensation layer, or a twisted orientation phase difference compensation layer.

8. A method for preparing a water-blocking optical film, used to prepare the water-blocking optical film according to any one of claims 5 to 7, characterized in that, The method for preparing the water-blocking optical film includes: A first phase difference compensation layer (120) is formed on the side of the substrate layer (100a) where the first auxiliary layer (100b) is provided. The water-blocking layer is solidified and formed.

9. A polarizer, characterized in that, It includes a polarizing film (200) and a water-blocking optical film as described in any one of claims 5 to 7.

10. A display device, characterized in that, include: The display screen and the polarizer as described in claim 9.

Images