TWI687495B - Photo curable composition and optical film and manufacturing method for the same - Google Patents

Abstract

A photo curable composition and an optical film and a manufacturing method for the same are disclosed. The photo curable glue includes an acrylate monomer (AB) and a urethane (meth) acrylate oligomer (C). The acrylate monomer (AB) includes a dilute monomer (A) and a reactive monomer (B). The dilute monomer (A) is a hydrophobic monofunctional methacrylic acid monomer. The reactive monomer (B) is a polar monofunctional methacrylic acid monomer or a polar multifunctional methacrylic acid monomer. The dilute monomer (A) has a glass transition temperature of -45℃ to -60℃. The reactive monomer (B) has a glass transition temperature of 40℃ to 90℃. A content of the urethane (meth) acrylate oligomer (C) is less than a content of the acrylate monomer (AB).

Description

Photocurable composition, optical film and manufacturing method thereof

The present invention relates to a photocurable composition and an optical film and a method for manufacturing the same, and particularly relates to a photocurable composition and an optical film having a good weather resistance and a method for manufacturing the same.

With the development of the Internet of Vehicles, the future of vehicle information will become more diversified, and the importance of vehicle displays will also increase day by day. After the integration of the touch panel in the vehicle display, in addition to replacing the traditional buttons, the basic control settings of the vehicle travel, In addition to providing drivers with driving information in real time, even to meet the entertainment needs of rear seat passengers at the same time, in the foreseeable future, car displays will become one of the most important man-machine interface. According to the application of in-vehicle terminals, full-fitting polarizers for in-vehicles are the key requirements of panel customers.

The invention relates to a photocurable composition and an optical film and a method for manufacturing the same.

According to one aspect of the present invention, a photocurable composition is proposed, which includes an acrylate monomer (AB) and a urethane (meth)acrylic oligomer (C). The acrylate monomer (AB) includes a diluted monomer (A) and a reactive monomer (B). dilution The monomer (A) is a hydrophobic monofunctional (meth)acrylic monomer. The reactive monomer (B) is a polar functional monofunctional (meth)acrylic monomer or a multifunctional (meth)acrylic monomer. The glass transition temperature of the diluted monomer (A) is between -45°C and -60°C. The glass transition temperature of the reactive monomer (B) is between 40°C and 90°C. The urethane (meth) acrylic oligomer (C) is a multifunctional aliphatic urethane acrylate oligomer. The content of urethane (meth)acrylic oligomer (C) is less than the content of acrylate monomer (AB).

According to another aspect of the present invention, a method for manufacturing an optical film is proposed, which includes the following steps. A cutting step is performed on a polarizing plate. The photocurable composition as described above is arranged on at least one cut surface of the polarizing plate. A light step is performed to cure the photocurable composition.

According to yet another aspect of the present invention, an optical film is proposed, which includes a polarizing plate and a waterproof layer. The waterproof layer is disposed on at least one cut surface of the polarizing plate, and is formed of the photocurable composition as described above.

According to yet another aspect of the present invention, an optical film is proposed, which includes a polarizing plate and a waterproof layer. The polarizing plate includes a polarizing film. The waterproof layer is disposed on the polarizing film and is formed of the photocurable composition as described above.

In order to have a better understanding of the above and other aspects of the present invention, the following examples are specifically described in conjunction with the accompanying drawings as follows:

100, 200: optical diaphragm

102: polarizer

104: release film

105: optical layer

106: Surface protective film

107, 109: protective layer

108: polarizing film

110: waterproof layer

111: Adhesive layer

C: Cutting steps

G: photocurable composition

S: Cut surface

K: surface

Figures 1 and 2 illustrate the optical film and its manufacturing method according to the first embodiment law.

FIG. 3 illustrates the optical film and the manufacturing method thereof according to the second embodiment.

The embodiments of the present invention will be described in detail in conjunction with the accompanying drawings. It should be noted that the following illustrations are not drawn to scale. In fact, the size of the element may be enlarged or reduced arbitrarily in order to clearly show the characteristics of the present invention. In the description and drawings, the same or similar elements will be represented by similar symbols.

Many different implementation methods or examples are disclosed below to implement different features of the present invention. The following describes specific examples of elements and their arrangements to illustrate the present invention. Of course, these are only examples and should not be used to limit the scope of the present invention. In addition, repeated reference numerals or marks may be used in different embodiments. These repetitions are only for a simple and clear description of the present disclosure, and do not mean that there is a specific relationship between the different embodiments and/or structures discussed.

Furthermore, it should be understood that there may be additional operation steps before, during or after the method is performed, and some of the operation steps described may be replaced or deleted in the method of other embodiments.

The photocurable composition (G) of the present invention includes an acrylate monomer (AB), an acrylate monomer and a urethane (meth)acrylic oligomer (C), in which the urethane (meth) The weight part of the acrylic oligomer (C) is less than the weight part of the acrylic monomer (AB).

Acrylic monomers (AB) Acrylic monomers may include (acrylic ester) diluting monomer (A), (acrylic ester) reactive monomer (B), or a combination of the foregoing. The content of the diluted monomer (A) is greater than the content of the reactive monomer (B).

The diluting monomer (A) may include a monofunctional (meth)acrylic monomer that provides hydrophobic properties, for example, may include tetrahydrofurfuryl acrylate (A-1) (tetrahydrofurfuryl acrylate (THFA), lauric acrylate (A-2 ) (lauryl acrylate, LA), iso-decyl acrylate (A-3) (iso-decyl acrylate, IDA), or a combination of the above. In some embodiments, the dilute monomer (A) is preferably isodecyl acrylate (A-3). In some embodiments, the weight of the diluted monomer (A) is 50% of the total weight of the diluted monomer (A), the reactive monomer (B) and the urethane (meth)acrylic oligomer (C) ~70%. In an embodiment, the glass transition temperature of the diluted monomer (A) may be between -45°C and -60°C. The refractive index of the diluted monomer (A) can be between 1.44 and 1.48.

The reactive monomer (B) may include a monofunctional (meth)acrylic monomer or a multifunctional (meth)acrylic monomer with a polar functional group, and the number of functional groups may be 1 to 9, preferably, the functional group The quantity is 1 to 3, for example, may include isobornyl acrylate (B-1) (isobornyl acrylate (IBOA)), 1,6-hexanediol diacrylate (B-2) (1,6-hexanediol diacrylate, HDDA ), or a combination of the above, wherein isobornyl acrylate (B-1) is preferred. In some embodiments, the weight of the reactive monomer (B) is 20% of the total weight of the diluted monomer (A), the reactive monomer (B) and the urethane (meth)acrylic oligomer (C) ~40%. The glass transition temperature of the reactive monomer (B) can be between 40°C and 90°C. The refractive index of the reactive monomer (B) can be between 1.44 and 1.48.

The urethane (meth)acrylic oligomer (C) may be a multifunctional aliphatic urethane acrylate oligomer, the number of functional groups is 1 to 12, and the number of functional groups is preferably 3 to 12, for example may include Aliphatic polyurethane triacrylate (C1) (aliphatic urethane triacrylate), acrylic polyurethane (C2) (acrylic polyurethane), or a combination of the above, among which acrylic polyurethane (C2) is preferred. In some embodiments, the weight of the urethane (meth)acrylic oligomer (C) accounts for the diluted monomer (A), the reactive monomer (B) and the urethane (meth)acrylic oligomer (C) 5%~20% of the total weight. In some embodiments, the refractive index of the urethane (meth)acrylic oligomer (C) ranges from 1.45 to 1.52.

In some embodiments, the photocurable composition (G) may further include a photoinitiator (D). The photo-initiator (D) can initiate the generation of free radicals or cationic reactive groups after absorbing light energy through light. These highly reactive free radicals or cationic groups are combined with acrylic monomers or epoxy monomers in the composition. The body and the corresponding oligomer undergo a chain extension reaction. Since the reactivity of free radical reaction or cationic group reaction is very fast, the reactants complete the reaction within a few seconds to a few minutes to form a functional polymer.

The photoinitiator (D) may include, for example, an aromatic carbonyl compound, an azo compound, or a combination thereof. Aromatic carbonyl compounds, such as phenyl ketone compounds, such as 1,2-diphenylethanedione (BenZil), benzophenone (Benzophenone), benzoin (Benzoin), and their ether derivatives, 1-hydroxyl Cyclohexyl phenyl ketone, or a combination thereof. In some embodiments, the total weight of the acrylate monomer (AB) and the urethane (meth)acrylic oligomer (C) is regarded as 100 parts by weight, and the photoinitiator (D) is 5 parts by weight .

After the photocurable composition (G) of the present invention is cured by the light irradiation step, the formed solid material has excellent waterproof properties and can be applied to any Product elements that are protected from environmental moisture, such as polarizing plates, etc.

1 and 2 illustrate the optical film 100 according to the first embodiment and its manufacturing method. The optical film 100 may be a single-layer or multi-layer film, such as a polarizer, retardation film, brightness enhancement film, or other optical gain, alignment, compensation, steering, orthogonal, diffusion, protection, anti-sticking, Scratch-resistant, anti-glare, reflection suppression, high refractive index and other helpful diaphragms. According to FIG. 1, a polarizing plate 102 is disclosed, which is a laminated structure, which may include a release film 104, a surface protection film 106, and a polarizing film 108 between the release film 104 and the surface protection film 106. There is an adhesive layer 111 between the polarizing film 108 and the surface protective film 106.

Polarizing film 108 is a laminated film, including an optical layer 105, a protective layer is disposed on at least one side of the optical layer, and in some embodiments, a protective layer 107 is disposed on the opposite side of the optical layer 105 as shown in FIG. With protective layer 109.

The optical layer 105 may be a polyvinyl alcohol (PVA) film and may be made by saponifying polyvinyl acetate resin. Examples of polyvinyl acetate resins include single polymers of vinyl acetate, that is, polyvinyl acetate, and copolymers of vinyl acetate and other monomers that can be copolymerized with vinyl acetate. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids (e.g. acrylic acid, methacrylic acid, ethyl acrylate, propyl n-acrylate, methyl methacrylate), olefins (e.g. ethylene, propylene, 1 -Butene, 2-methylpropene), vinyl ether (such as ethyl vinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acid (such as vinyl sulfonic acid, vinyl Sodium sulfonate) and so on.

The materials of the protective layers 107 and 109 can be selected from: cellulose resin, Acrylic resins, non-crystalline polyolefin resins, polyester resins, polycarbonate resins and combinations thereof, specifically may include polymethylmethacrylate (PMMA), cellulose resins refer to cellulose Part of the hydroxyl group is esterified with acetic acid, or a part of the esterified with acetic acid, and partly with other esterified mixed ester. The cellulose-based resin is preferably a cellulose ester-based resin, more preferably an acetyl cellulose-based resin, such as triethyl acetyl cellulose, diethyl acetyl cellulose, cellulose acetate propionate, cellulose Acetate butyrate, etc., cellulose that is fully esterified is called triacetate cellulose (TAC), acrylic resin film, polyaromatic hydroxy resin film, polyether resin film, cyclic polyolefin resin film (such as polyacrylic acid). (Norbornene resin film), polycarbonate resin such as polyester formed from carbonic acid and diol or bisphenol, such as: polyethylene terephthalate (Polyethylene Terephthalate, PET), polypropylene (Polypropylene, PP ), polyethylene (PE), non-crystalline polyolefin resins such as cyclo olefin (co) polymers (COC/COP), composed of norbornene and cyclopentadiene , Dicyclopentadiene, tetracyclododecene and other ring-opening polymers, or copolymers with olefins, polycarbonate (Polycarbonate, PC) and any combination of the above groups. In addition, the materials of the protective layers 107 and 109 may be, for example, thermosetting properties such as (meth)acrylic system, urethane system, acrylic urethane system, epoxy system, polysiloxane system, etc. Resin or UV curable resin. In addition, the protective layers 107 and 109 may be further subjected to surface treatment, for example, anti-glare treatment, anti-reflection treatment, hard coating treatment, antistatic treatment or anti-fouling treatment.

In some embodiments, the release film 104 and the surface protection film 106 may be The materials of the protective layers 107 and 109 are the same or different, and the materials can be selected from cellulose resins, acrylic resins, non-crystalline polyolefin resins, polyester resins, polycarbonate resins, and combinations thereof. The release film 104 and the surface protection film 106 may still include a photocurable adhesive material, or other suitable materials. The photocurable adhesive material is selected from the group consisting of acrylic resin, polyester resin, polycarbonate resin, and amorphous polyolefin resin. The photocurable adhesive material may include a photopolymerizable compound, among which the photocurable adhesive material The photopolymerizable compound used is not particularly limited, and examples thereof include acrylic monomers such as polyester acrylate, urethane acrylate, polybutadiene acrylate, silicone acrylate, and epoxy acrylate; hydrogenated epoxy Monomers, alicyclic epoxy monomers, aliphatic epoxy monomers and other epoxy monomers, epoxy acrylate prepolymers, acrylate prepolymers, urethane acrylate prepolymers, aliphatic The urethane acrylate prepolymer, aromatic urethane acrylate prepolymer, polyester acrylate prepolymer and the like can be used alone or in combination of two or more of the above materials.

In one embodiment, the disclosure of the polarizing plate 102 is not limited to this. In other embodiments, the polarizing plate 102 may have other film layer configurations according to actual needs, for example, it may also include other optical property films, such as retardation films and anti-reflection films. , Anti-glare film, etc.

The surface protection film 106 and the polarizing film 108 have an adhesive layer 111. In some embodiments, the adhesive layer 111 may be, for example, a pressure sensitive adhesive (PSA) containing acrylic resin. The pressure-sensitive adhesive has a flowing property, therefore, after the polarizing plate 102 is cut in step C, a glue overflow phenomenon may occur to cause mutual adhesion between the stacked layer films. In the embodiment, after the cutting step C, By using the photocurable composition G of the present invention to form a waterproof layer 110 on the cut surface S (Figure 2) of the polarizing plate 102, the problem of sticking between the optical films 100 can be avoided.

Referring to FIG. 2, after the polarizing plate 102 undergoes the cutting step C, the photocurable composition G of the present invention is provided in a thin film form on the cut surface S of at least one side of the polarizing plate 102, for example, it can be provided on the opposite side. On both sides of the cut surface S, or can be set on all cut surfaces, but not limited to this. The cut surface S is a surface in the longitudinal direction and the thickness direction, and/or the cut surface S is a surface in the width direction and the thickness direction.

The photo-curable composition G can be provided by spraying, or, for example, an upright roller method roller brush, but the method is not limited to this, and the photo-curable composition G may be adhered to the surface of the polarizing plate 102 in other possible ways. The preferred viscosity of the photocurable composition G is less than 50 cps. The thickness of the photocurable composition G attached to the surface of the polarizing plate 102 (cut surface S) may be between 1 μm and 8 μm, and the preferred thickness is 2 μm~ Between 6μm, the better thickness is between 3μm~5μm. In one embodiment, after the cutting step C, a grinding step may be performed. After the cut surface S of the photo-cured polarizing plate 102 is flattened, the photo-curable composition G is adhered to the polarizing plate 102. Then, the photocurable composition G is subjected to a light irradiation step to be cured to form the waterproof layer 110. The light irradiation step may be performed using ultraviolet light. The wavelength range of the ultraviolet light is between 320 nm and 390 nm, and the irradiation power is between 50 mJcm ² and 100 mJcm ² to allow the photocurable composition G to cure. Light from other wavelength ranges can also be used appropriately.

The waterproof layer 110 formed by curing the photocurable composition G of the present invention through the light irradiation step can improve the weather resistance of the polarizing plate 102, which is described as follows: polarizing plate 102 Polyvinyl alcohol (PVA) film in the high temperature environment is easy to crack, or react with water to produce hydrolysis to generate high extinction coefficient polyene (polyene) polymer and yellowing phenomenon, making the optical properties of the polarizer 102 Get worse. In the embodiment, the waterproof layer 110 formed by curing the photocurable composition G of the present invention through the light irradiation step can block the polarizer 102 from environmental substances that may affect optical properties, so as to improve the weatherability of the polarizer 102. For example, in one embodiment, the polarizing film 108 includes a PVA film, and the waterproof layer 110 may be formed at least on the cut surface S of the PVA film. The waterproof property of the waterproof layer 110 is used to prevent the infiltration of moisture from the external environment into the PVA film. Reaction produces yellowing. However, the present disclosure is not limited to this. The waterproof layer 110 may also be disposed on the cut surface S of other material films, or even extend to the upper surface edge of the release film 104 or the surface protection film 106 of other material films of the polarizer 102 The edge of the lower surface. The waterproof layer 110 formed by the photocurable composition G of the present invention can avoid the problem that the polarizing plate 102 is easily yellowed in a high-temperature environment, so the optical film 100 can be applied to products that may be in a high-temperature environment, including vehicles Products, such as car displays, etc.

FIG. 3 illustrates the optical film 200 and the method of manufacturing the same according to the second embodiment. The difference from the first embodiment is that the photocurable composition G is provided on at least one side of the polarizing film 108 in the form of a thin film. For example, on the surface K of the protective layer 109 (Figure 1) of the polarizing film 108, the photo-curable composition G is then cured by a light irradiation step to form the waterproof layer 110. The surface K is a surface in the longitudinal direction and the width direction.

In order to make the above purposes, features, and advantages of this disclosure more obvious and understandable, the following specific examples are described in detail as follows: Table 1 and Table 2 show the composition (parts by weight) of the photocurable composition G of Examples 1 to 4 and Comparative Examples 1 to 10 and the test evaluation results of the optical film 100.

The composition of the photocurable composition G is as follows:

(A-1) Tetrahydrofuran acrylate (THFA) provided by Hengqiao Industry

(A-2) Lauric acid acrylate (LA) Provided by Hengqiao Industry

(A-3) Isodecyl acrylate (IDA) provided by Aijianmeng, Taiwan

(B-1) Isobornyl acrylate (IBOA) provided by Ai Jianmeng, Taiwan

(B-2) 1,6-Hexanediol diacrylate (HDDA) provided by SARTOMER

(C-1) Aliphatic polyurethane triacrylate (6892) Provided by Aijianmeng, Taiwan

(C-2) Acrylic polyurethane (CN8885) provided by SARTOMER

(D) Use 1-hydroxycyclohexyl phenyl ketone as the photoinitiator (trade name IRGACURE 184, provided by Hengqiao Industry)

The number of functional groups of reactive monomer (B) and urethane (meth)acrylic oligomer (C) is shown in Table 3 as follows:

It should be noted that although the comparative examples 1 to 10 in Table 1 and Table 2 use the term "comparative example" to express some examples, it is not intended to limit the scope of the present invention to exclude the case of comparative examples. The scope of protection of the invention shall be subject to the scope defined in the attached patent application, for example, it may include examples and comparative examples.

Viscosity test: measured on photocurable composition G at 25°C (unit cps, centipoise. second).

Formula compatibility indicates the compatibility of the composition of the photocurable composition G.

UV irradiation curing test: after coating by spraying or vertical roller, etc., UV light is used for curing test. "OK" means that the photocurable composition G can be cured with an irradiation power of 100 mJcm ² . "NG" indicates that the photo-curable composition G needs to be irradiated with a power greater than 100 mJcm ² to be cured.

Adhesion test: apply the photocurable composition G on the cut surface of the polarizing plate by spraying or upright roller, etc., and use UV light to cure, then detect the waterproof layer formed after curing and attach to the polarizing plate Situation. "OK" It indicates that the waterproof layer is attached to the polarizing plate in a good condition. "NG" means that the waterproof layer cannot be attached to the polarizing plate waterproof layer.

Coating test: The prepared photo-curable composition G is sprayed in a quantitative manner using spray equipment or using the vertical roller method to brush the cut surface of the polarized plate 102 after cutting, and then using ultraviolet (UV) to The light-curable composition G was irradiated with a power of 100 mJcm ² to form the waterproof layer 110. The coating thickness of the photocurable composition G needs to be 5um, so the viscosity is less than 50cps. In Table 1, "OK" indicates that the photocurable composition can be quantitatively coated on the cut surface of the polarized plate after cutting, and after ultraviolet (UV) irradiation, the thickness of the photocurable composition to form a waterproof layer is about 5um ; "NG" indicates that the thickness of the waterproof layer formed by the photocurable composition is too high due to high viscosity; "-" indicates that the photocurable composition has poor compatibility when it is formulated, and therefore cannot be coated.

Anti-adhesion test: test the mutual adhesion of the stacked layers of polarizing plates. After coating the photocurable composition G on the cut surface around the polarizing plate by spraying or standing roller, etc., and curing with UV light, the properties of the waterproof layer formed after curing are tested. "OK" means that the waterproof layer is cured enough, so it is not sticky and there is no sticking phenomenon. "NG" means that the waterproof layer is not cured enough, so it is sticky (Tg is too low), and sticking phenomenon occurs.

Moisture permeability test: The optical film is placed in a clean moisture-permeable cup according to the standard method of JISZ0208 (the moisture-permeable cup is made of light-weight, corrosion-resistant and air-impermeable materials, and the effective measurement area is at least 25m ² ) , The added amount is 5.00~5.02g. Then, the optical film 100 with an area of 1 m ² (where the polarizing plate 102 is composed of a TAC/PVA/PSA/TAC structure, and the protective film formed by the photocurable composition G is attached to the peripheral end surface of the TAC layer) is placed in the center of the cup , With sealing ring and cup ring, and tightly sealed with wax. Put the moisture-permeable cup into the desiccator again, weigh it after equilibrating for 30 minutes. After weighing, put the moisture-permeable cup into the constant temperature and humidity cabinet with adjusted temperature and humidity (40℃, relative humidity is 90%, the brand is Espec company), and the temperature and humidity will be changed after 24 hours. The penetrating cup taken out of the box is placed in a desiccator, and after 30 minutes of equilibration, weighing is performed. And bring into the formula to calculate its water vapor transmission rate (WVTR; unit g/mm×24h): WVTR=(M2-M1)/(T×S)24h

M2: Weight of moisture-permeable cup after humidification (g)

M1: Weight of the permeable cup before humidification (g)

T: test time (24h)

S: Permeable area

Yellowing test: After fully bonding the optical film 100 to the glass and then degassing under pressure, set it in an oven set at 105 ℃, -40 ℃, 60 ℃ and a relative humidity of 90% ( In Espec), perform a reliability test for 500 hours, and then use an optical colorimeter (SRUL1) to observe the difference in chromaticity (after the reliability, the difference in optical chromaticity points before subtracting the reliability). The chromaticity difference range <0.01 means no yellowing phenomenon, which is indicated by "OK" in Table 1. The chromaticity difference range of 0.01~0.03 indicates slight yellowing. Chromaticity difference range>0.03 indicates severe yellowing.

Weather resistance test: After the optical film 100 is fully attached to the glass and then degassed under pressure, it is set in an oven (Espec Corporation) set at a temperature of 105°C, -40, 60°C and a relative humidity of 90% ), conduct a 500-hour reliability test, It observes the degree of foamability and peelability. The case where there is no foaming or peeling is indicated by "OK". The foaming situation is difficult to discern visually and needs to be observed with an optical microscope and occurs in the corners of the edges to be judged as "slight foaming". It can be seen visually that the foaming occurs only in a specific area and the foaming is not densely determined as "a little foaming". Those with a full area of foaming are judged to be "full foaming". If the peeling distance is less than 1mm from the film edge, it is judged as "slight peeling". If the peeling distance is between 1 and 5 mm from the film edge, it is judged as "partial peeling". If the peeling distance is greater than 5mm from the film edge, it is judged as "severe peeling".

In the judgment result, "OK" indicates that it is suitable for product demand, and "NG" is the opposite.

At least the following results can be found from Table 1 and Table 2. According to Example 2, Comparative Example 7 and Comparative Example 9, it can be found that better test results can be obtained by using isodecyl acrylate (A-3). According to Example 2 and Comparative Example 11, it can be found that using isobornyl acrylate (B-1) can obtain better test results. According to Example 2 and Comparative Example 10, it can be found that using acrylic urethane (C2) can obtain better test results.

In summary, although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can make various modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be deemed as defined by the scope of the attached patent application.

100: optical diaphragm

102: polarizer

104: release film

105: optical layer

106: Surface protective film

107, 109: protective layer

108: polarizing film

110: waterproof layer

111: Adhesive layer

G: photocurable composition

S: Cut surface

Claims (9)

A photocurable composition comprising: isodecyl acrylate, isobornyl acrylate and acrylic polyurethane, wherein the weight of the isodecyl acrylate accounts for the isodecyl acrylate, the isobornyl acrylate and the acrylic polyurethane 50% to 70% of the total weight, the weight of the isobornyl acrylate accounts for 20% to 40% of the total weight of the isodecyl acrylate, the isobornyl acrylate and the acrylic polyurethane, and the weight of the acrylic polyurethane The weight is 5%-20% of the total weight of the isodecyl acrylate, the isobornyl acrylate, and the acrylic polyurethane. The photo-curable composition as described in item 1 of the patent scope, wherein the refractive index of the acrylic polyurethane is in the range of 1.45 to 1.52; and/or the number of functional groups of the acrylic polyurethane is between 1 and 12. The photocurable composition as described in item 1 of the patent scope further includes a photoinitiator (D), wherein the total weight of the isodecyl acrylate, the isobornyl acrylate and the acrylic urethane is regarded as 100 The photoinitiator (D) is 5 parts by weight. The photocurable composition as described in item 3 of the patent scope, wherein the photoinitiator (D) includes an aromatic carbonyl compound, an azo compound, or a combination thereof. A method for manufacturing an optical film, comprising: performing a cutting step on a polarizing plate; arranging at least one cut surface of the polarizing plate as described in any one of claims 1 to 4 A photo-curable composition; and performing an illumination step to cure the photo-curable composition. The method for manufacturing an optical film as described in item 5 of the patent scope, wherein the means for disposing the photocurable composition is selected from one of a spray coating method and an upright roller method. The method for manufacturing an optical film as described in item 5 of the patent scope, wherein the viscosity of the photocurable composition is less than 50 cps; and/or the thickness of the photocurable composition disposed on the cut surface is 1 μm to 8 μm between. The method for manufacturing an optical film as described in item 5 of the patent scope, wherein the illumination step uses ultraviolet light; and/or the illumination wavelength range of the illumination step is between 320 nm and 390 nm; and/or the illumination step The irradiation power is between 50mJcm ² ~100mJcm ² . The method for manufacturing an optical film as described in item 5 of the patent scope further includes performing a grinding step after the cutting step.

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