KR20080055698A - High scratch resistance optical film and polarizer and display comprising the same - Google Patents

Abstract

A high-hardness optical film, a polarizer having the same, and a display device are provided to prevent a hard coating layer from being broken by forming a rigid layer between a base film and the hard coating layer. A high-hardness optical film includes a plastic base film(10), a rigid layer(20), and a hard coating layer(30). The rigid layer is formed on one surface of the plastic base film. A thermosetting resin and an optical curing resin are mixed at a ratio 6-9:1-4 w%. The hard coating layer is formed on the rigid layer. The thermosetting resin and the optical curing resin include at least one functional group which is selected from the group consisting of an unsaturated coupling group, an epoxy group, and a urethane group.

Description

High Hardness Hard-Coated Optical Film, Polarizer and Display Comprising The Same {High Scratch Resistance Optical Film and Polarizer and Display Comprising the Same}

The present invention relates to a hard coat optical film having excellent hardness and impact resistance, a polarizing plate and a display device including the same. More particularly, the present invention relates to a high-hardness hard-coated optical film having a rigid layer provided between the substrate and the hard coating layer, which exhibits excellent hardness and impact resistance, and a polarizing plate and a display device including the same.

Recently, due to the slimming trend of mobile, designs have been attempted in which the outermost layer of plastic plates is eliminated and the hard coated optical film of the outermost layer of the polarizing film attached directly under the panel is exposed to the outside. However, hard-coating optical film has yet to be practically used because the hardness is weak compared to the plastic plate. As the hardness of the optical film forming the outermost layer of the polarizing film increases, the practical use of the slimmer product will accelerate. In response to this need, high-hardness hard coating optical films are required to be developed.

At the time of manufacturing the polarizing film, a lot of defects of the polarizing film is generated by the scratch of the roll, and this causes a failure rate of the panel increases, so a hard coating film is used to prevent this. However, in spite of the use of the hard coat film, the defect by the scratch still occurs. As described above, the hard coating film is also applied to the lower polarizing film to prevent scratching of the lower polarizing film during the panel process as well as the outermost layer of the polarizing film.

Conventional hard coating film is commercialized about 3H pencil hardness. When the same hard coating composition is applied to glass, pencil hardness of about 7H to 9H is obtained. However, when the conventional hard coating composition is applied to a plastic substrate, since the plastic substrate having a weak hardness is easily deformed by external pressure, the hard coating layer formed on the plastic substrate is also modified accordingly, so that the hard coating film has a pencil strength of about 3H. There is a problem that can only be obtained. In order to increase pencil hardness in such a plastic film, a method of forming a hard coat layer having a thickness of 20 μm or more has been attempted. However, the hard coating film obtained by this method has a problem that the hardness is improved, but the impact resistance is weak, so that cracking or cracking occurs even in a small impact, and curling occurs a lot during the process. Therefore, it has been difficult to manufacture a high-hardness hard coat film having good properties that are practical in the prior art, and therefore, development of a practical hard coat film excellent in hardness and impact resistance is required.

The present invention has been proposed to solve the above problems, to provide a high hardness hard coat optical film excellent in hardness, impact resistance, wear resistance and scratch resistance.

The present invention is to provide a high-hardness hard-coated optical film to prevent curling.

The present invention also provides a polarizing plate and a display device comprising a high-hardness hard-coated optical film excellent in hardness, impact resistance, wear resistance and scratch resistance of the present invention.

According to one aspect of the invention,

Plastic base film;

A rigid layer comprising a thermosetting compound and a photocurable compound in a ratio of 6-9: 1 to 4 by weight on one surface of the plastic base film; And

A hard coating layer formed on the rigid layer;

Provided is a high hardness hard coating optical film comprising a.

According to another aspect of the present invention,

A polarizing plate including the high hardness hard coat optical film of the present invention is provided.

According to another aspect of the present invention,

A display device including the high hardness hard coat optical film of the present invention is provided.

The hard coating optical film of the present invention having a rigid layer between the base film and the hard coating layer has excellent pencil hardness, specifically pencil hardness of 4H to 7H, wear resistance, scratch resistance and impact resistance. The hard coating optical film of the present invention is prevented from cracking and cracking the hard coating layer and deformation of the plastic substrate. In addition, since the hard coating optical film of the present invention is provided with a rigid layer, the hard coating layer can be formed into a thin film having a thickness of 20 μm or less, thereby preventing curling problems. In the case of using the high hardness hard coating optical film of the present invention, scratch generation is prevented due to excellent pencil hardness in the process using the polarizing film and other panels and hard coating optical film using the same. Furthermore, the optical film of the present invention can also be used as the substrate of the outermost layer of the display device and the high hardness antireflection film as being excellent in hardness, impact resistance, abrasion resistance, and scratch resistance.

The present invention is characterized by having a very hard rigid layer between the base film and the hard coating layer, thereby improving the pencil hardness of the optical film and preventing deformation of the hard coating layer and the optical film.

1 is a side cross-sectional view of a high hardness hard coat optical film according to the present invention. The high hardness hard coating optical film according to the present invention includes a base film 10, a rigid layer 20 formed on one surface of the base film and a hard coating layer 30 formed on the rigid layer.

In the high-hardness hard coating film of the present invention, a plastic film is used as the base film, and as the plastic film, triacetylcellulose (TAC) and diacetylcellulose (DAC) having excellent optical properties, Cellulose Film, Polycarbonate (PC), Polyimide (PI), Polyethersulfone (PES), Polyarylate (PAR), Polyacrylate (PA), Polyethylene Naphthalate (Polyethylene naphthalate, PEN), polyethylene terephthalate (PET), cycloolefin film, cycloolefin copolymer film, retardation film having a phase function and compensation film, etc. may be used. .

The rigid layer formed on the base film comprises a thermosetting compound and a photocurable compound, and the rigid layer is formed including most thermosetting compounds and some photocurable compounds. Specifically, the rigid layer is formed by including a thermosetting compound and a photocurable compound in a weight ratio of 6-9: 1-4 in terms of the adhesion between the rigid layer and the hard coating layer and the physical properties of the rigid layer.

If the content of the thermosetting compound to 1 to 4 parts by weight of the photocurable compound is less than 6 parts by weight, the adhesion between the hard coating layer formed on the rigid layer and the rigid layer is not good, and if the content is more than 9 parts by weight, the rigid layer is too brittle. )

As the thermosetting compound and the photocurable compound constituting the rigid layer of the high hardness hard coat film of the present invention, a compound having one or more functional groups may be used. The functional group refers to an unsaturated bond group capable of crosslinking reaction or an ionic polymerization or condensation reaction such as epoxy or urethane in the molecular structure.

As the thermosetting compound used to form the rigid layer, melamine-based resin may be used, and more specifically, N-butyl melamine resin or isobutyl melamine resin may be preferably used. The thermosetting resin may be used alone or in combination of two or more, more preferably used in combination of two or more.

Polyfunctional monomo or oligomers thereof may be used as the photocurable compound that may be used together with the thermosetting compound to form a rigid layer. As the photocurable compound, a urethane acrylate oligomer, an epoxy acrylate oligomer, a polyether acrylate, a polyester acrylate or a mixture thereof may be used as the acrylate oligomer having four or more functional groups. As the acrylate monomer having four or more functional groups, dipentaerythritol hexa acrylate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, pentaacrylthiotol tetraacrylate, dipentaerythritol pentaacrylate or these Mixtures of may be used.

It is preferable to use a urethane acrylate oligomer, dipentaerythritol hexa acrylate, dipentaerythritol hexaacrylate, and mixtures thereof in the photofunctional resin having at least four functional groups.

Trifunctional group acrylate monomers such as pentaalkyltritol triacrylate, pentaerythritol triacrylate, trimethylolpropane trimethacrylate and trimethylolpropane triacrylate as acrylate monomers or oligomers of trifunctional groups or less as photocurable compounds or Oligomers; Bifunctional groups such as polyethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triphenylglycol diacrylate, butanediol diacrylate, hexamethyldiol diacrylate and triethylene glycol diacrylate Acrylate monomers and oligomers thereof; With hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, ethoxyethyl (meth) acrylate, allyl methacrylate, caprolactone acrylate, triethylolpropane methacrylate and methyl methacrylate; Same monofunctional acrylate monomers and oligomers; And mixtures thereof. The photocurable compounds may also be used alone or in combination of two or more, preferably used in combination of two or more. In addition, two or more kinds of copolymers of the above monomers may also be used.

The rigid layer may be formed by coating and curing a composition including a thermosetting compound and a photocurable compound constituting the rigid layer on the base film. The rigid layer forming composition is not limited thereto, but may include, for example, the thermosetting compound, a photocurable compound, a photopolymerization initiator, a residual solvent, and the like.

In the rigid layer forming composition, the thermosetting compound and the photocurable compound are formed such that the weight ratio of the thermosetting compound and the photocurable compound in the rigid layer is 6-9: 1-4. In the present invention, the content of the thermosetting compound and the photocurable compound, which are the main ingredients of the rigid layer forming composition, is not limited, so long as the thermosetting compound and the photocurable compound are composed in a weight ratio of 6-9: 1-4 in the rigid layer. In the layer forming composition, the main material may be appropriately adjusted by those skilled in the art in consideration of coating properties.

In addition, a photoinitiator is mix | blended with the said rigid layer formation composition so that the thermosetting compound and photocurable compound which form a rigid layer may be hardened. Examples of the photopolymerization initiator are not limited thereto, but for example, 1-hydroxycyclohexylphenyl ketone, 2,2'-dimethoxy-2-phenylacetophenone, xanthone, 4,4'-dimethoxybenzophenone , 4,4'-diaminobenzophenone, mihiraketone, benzoinpropyl ether, benzoin ethyl ether, benzyldimethyl ketal, 1- (4-isopropylphenol) -2-hydroxy-2-methylpropane-1 -One, 2-hydroxy-2-methyl-1-phenylpropane-1-one, thioxanthone, diethyl thioxanthone, 2-isopropyl thioxanthone, 2-chloro thioxanthone, 2-methyl- 1- [4- (methylthio) phenyl] -2-morpholino-propane-1-one, 2,4,6-trimethylbenzoyldiphenylphosphineoxide, bis- (2,6-dimethoxybenzoyl)- 2,4,4-trimethylpentyl phosphine oxide etc. are mentioned. These may be used alone or in combination of two or more.

The photopolymerization initiator is preferably blended at 0.1 to 10% by weight, preferably 0.1 to 5% by weight, based on the total weight of the rigid layer forming composition. If the amount of the photopolymerization initiator added is less than 0.1% by weight, it may not be sufficiently cured. If the amount of the photopolymerization initiator is more than 10% by weight, photopolymerization may occur too quickly, resulting in insufficient coating strength and adhesion.

Examples of the solvent in the rigid layer forming composition include alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, propanol and isopropanol, methyl ethyl ketone, ketones of methyl isobutyl ketone, esters such as ethyl acetate, methyl acetate and butyl acetate, Aromatic solvents such as toluene and xylene, ethyl cellosolve, methyl cellosolve and the like can be used.

Since the rigid layer is composed of most thermosetting compounds and some photocurable compounds, the rigid layer is formed of a very hard rigid layer by the combined action of thermosetting and photocuring. More specifically, a thermosetting device is provided at the front of the coater and a photocuring device is provided at the rear of the coater to pass through the coater after coating, and then thermally cured and then photocured to form a rigid layer.

The rigid layer of high hardness is formed with a dry coating thickness of 2 ~ 20㎛ on one surface of the base film in consideration of the physical properties of the rigid layer. If the dry coating thickness of the rigid layer is less than 2 µm, the effect of the rigid layer may not be sufficiently exhibited.

A hard coat layer is formed on the rigid layer. The hard coat layer is generally known in the art and does not particularly limit the present invention to a hard coat layer forming material, a formation method, or the like. The hard coating layer may be any material generally known as a host compound used in forming a hard coating layer in the art, but is not limited thereto, and may be generally formed of a photocurable compound.

As the photocurable compound used to form the hard coat layer, a monomer or oligomer as described below having one or more functional groups may be used. The functional group refers to an unsaturated bond group capable of crosslinking reaction or an ionic polymerization or condensation reaction such as epoxy or urethane in the molecular structure. The hard coating layer may be any material generally known as a host compound (photocurable compound) used in the art for forming the hard coating layer, but is not limited thereto. For example, the hard coating layer may be formed of an acrylate oligomer of at least four functional groups. Urethane acrylate oligomers, epoxy acrylate oligomers, polyether acrylates, polyester acrylates or mixtures thereof may be used. As the acrylate monomer having four or more functional groups, dipentaacrythritol hexaacrylate, dipentacretritol pentaacrylate, pentaacrylthiotol tetraacrylate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate or Mixtures of these can be used. It is preferable to use the urethane acrylate oligomer, dipentaerythritol hexa acrylate, dipentaerythritol hexaacrylate, and mixtures thereof in the above photofunctional resin having at least four functional groups.

As the photocurable resin for forming the hard coating layer, acrylate oligomers or monomers having a trifunctional or lower functional group may be selected from trifunctional groups such as pentaalkyltritol triacrylate, pentaerythritol triacrylate, trimethylolpropane trimethacrylate and trimethylolpropane triacrylate. Functional group acrylate monomers; Bifunctional groups such as polyethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triphenylglycol diacrylate, butanediol diacrylate, hexamethyldiol diacrylate and triethylene glycol diacrylate Acrylate oligomers or monomers; Hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, ethoxyethyl (meth) acrylate, allyl methacrylate, caprolactone acrylate, triethylolpropane (meth) acrylate and methylmethacryl Monofunctional acrylate monomers such as rate; And mixtures thereof.

The hard coat layer is formed by a general method of coating and curing a composition comprising a resin, a photoinitiator and a residual solvent forming the hard coat layer on the rigid layer. The present invention is not limited to the mixing ratio of the photocurable material, which is the main ingredient in the hard coating layer-forming composition, and the person skilled in the art can consider the coating properties and the intended physical properties in any range generally known in the art. For example, the photocurable compound as a main ingredient may be combined with a photopolymerization initiator and the like at a suitable concentration in a solvent to form a hard coat layer. The photopolymerization initiator may be blended in an amount of 0.1 to 10% by weight, preferably 0.1 to 5% by weight, based on the total weight of the hard coating layer-forming composition, to help the hard coating layer-forming composition. If the amount of the photopolymerization initiator is less than 0.1% by weight, it may not be sufficiently cured. If the amount of the photopolymerization initiator is more than 10% by weight, photopolymerization may occur too quickly, resulting in a decrease in the molecular weight of the polymer which may give the required properties, resulting in a problem in that the coating film strength and adhesion may not be obtained.

In the hard coat layer-forming composition, solvents include alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, propanol, isopropanol, methyl ethyl ketone, ketones of methyl isobutyl ketone, esters such as ethyl acetate, methyl acetate, butyl acetate, Aromatic solvents such as toluene and xylene, ethyl cellosolve, methyl cellosolve and the like can be used.

The hard coat layer-forming composition may be further blended with additives generally known in the art, such as coupling agents, leveling agents, thixotropic agents, if necessary.

If the hard coating layer is too thin, the hardness is not enough, and if the thickness is too thick, curling is likely to occur.

The rigid layer forming composition and the hard coat layer forming composition may be formed by coating and curing the substrate or the rigid layer, respectively, by any coating method generally known in the art. The coating method is not limited thereto, and for example, bar coating, air knife coating, curtain coating, roll coating, gravure coating, extrusion coating, spray coating, comma coating method, or the like can be used. Curing Methods In addition, any method known in the art may be used.

Meanwhile, in the hard coat optical film of the present invention, the pencil hardness of the rigid film of the base film, the rigid layer, and the hard coating layer has the largest value. In the optical film of the present invention, the hard-coated optical film has an excellent pencil hardness of 4H to 7H by the very hard rigid layer described above. That is, even when the hard coating layer is formed on the conventional plastic base film, the optical film shows a low pencil hardness of about 3H due to the deformation of the hard coating layer, but the optical film according to the present invention has a very hard high pencil formed between the base film and the hard coating layer. Deformation and damage of the hard coating layer is prevented by the rigid layer of hardness not only has excellent hardness, impact resistance, wear resistance and scratch resistance, but also the hard coating layer can be formed into a thin film of 20㎛ or less to prevent curling.

In addition, a polarizing plate and a display device including the high hardness hard coat optical film according to the present invention are provided. Examples of the display device include, but are not limited to, a liquid crystal display (LCD), an organic light emitting display (OLED, PLED), a plasma display (PDP), and the like. The high hardness hard coat optical film of the present invention is excellent in hardness, impact resistance, abrasion resistance, and scratch resistance, and may be used as the outermost layer of the display device or the substrate of the high hardness antireflection film.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following Examples do not limit the present invention.

Example  One

(1) plastic base material

An 80 µm thick TAC film (Fuji) was used as the plastic substrate.

(2) formation of a rigid layer

N-butyl melamine resin (J-820-60, Aekyung Chemical) 16.2 wt%, pentaerythritol triacrylate 2.3 wt%, dipentaerythritol hexaacrylate 4.5 wt%, isopropyl alcohol 30 wt%, MIBK (methyl 15% by weight of isobutyl ketone), 31.3% by weight of butyl acetate and 0.7% by weight of 1-hydroxy cyclohexyl phenyl ketone were used as a rigid layer forming composition.

The rigid layer-forming composition was coated on the TAC film with Mayer 10 and thermally cured, and immediately photocured with UV to form a rigid layer having a thickness of 8 μm.

(3) Formation of Hard Coating Layer

2% by weight of trimethylolpropane triacrylate, 4% by weight of pentaerythritol triacrylate, 14% by weight of dipentaerythritol hexa acrylate, 10% by weight of methanol, 30% by weight of isopropyl alcohol, 10% by weight of methyl cellosolve 20 wt% ethyl cellosolve, 9.3 wt% toluene, and 0.7 wt% 1-hydroxy cyclohexyl phenyl ketone were used as the hard layer forming composition.

The hard layer forming composition was coated on the rigid layer with Mayer 10 and photocured with UV to form a hard coating layer having a dry thickness of 8 μm. The pencil hardness of the optical film of Example 1, wherein the rigid layer and the hard coating layer were formed, was measured at a 45 degree 1,000 gf load by Hanseung E. eye hardness test. The pencil hardness of the substrate is about HB ~ 1H, the pencil hardness of the rigid layer is 7H, the pencil hardness of the hard coating layer is 5H and the pencil hardness of the optical film is 5H, which is also shown in Table 1 below.

Comparative example  One

In this comparative example, only the hard coat layer was formed on a 80 micrometer-thick TAC film (Fuji), without forming a rigid layer. 2 weight% of trimethylolpropane triacrylates, 4 weight% of pentaerythritol triacrylates, and dipentaerythritol 14% by weight of hexa acrylate, 10% by weight of methanol, 30% by weight of isopropyl alcohol, 10% by weight of methyl cellosolve, 20% by weight of ethyl cellosolve, 8.6% by weight of toluene and 1.4% of 1-hydroxy cyclohexyl phenyl ketone % Was blended and used as a hard coat layer forming composition.

The hard coat layer-forming composition was coated on the TAC film with Meyer bar 10. After coating, it was photocured with UV to form a hard coat layer having a dry thickness of 8 μm. In this Comparative Example 1, no additional rigid layer was formed. The pencil hardness of the obtained optical film was measured with a 45 degree 1,000 gf load by Hanseung E & I pencil hardness test, and is shown in Table 1 below.

Comparative example  2

In this comparative example, only the hard coat layer was formed without forming a rigid layer in the 80-micrometer-thick TAC film (Fuji). The hard coat layer forming composition is 6.7% by weight of trimethylolpropane triacrylate, 6.7% by weight of pentaerythritol triacrylate, 6.6% by weight of dipentaerythritol hexa acrylate, 10% by weight of methanol, 28.1% by weight of isopropyl alcohol, 20% by weight of methyl cellosolve, 20% by weight of methyl ethyl ketone and 1.9% by weight of 1-hydroxy cyclohexyl phenyl ketone were used in combination.

The hard coat layer forming composition was coated on the TAC film with Mayer No. 10. After coating, it was photocured with UV to form a hard coat layer having a dry thickness of 8 μm. The pencil hardness of the obtained optical film was measured with a 45 degree 1,000 gf load by Hanseung E & I pencil hardness test, and is shown in Table 1 below.

Comparative example  3

In this comparative example, only the hard coat layer was immediately formed without forming a rigid layer on a 80 μm-thick TAC film (Fuji). The hard coating layer-forming composition is 6.7% by weight of hexamethyldiol diacrylate, 6.7% by weight of pentaerythritol triacrylate, 6.6% by weight of dipentaerythritol hexaacrylate, 10% by weight of methanol, 28.1% by weight of isopropyl alcohol, methylcell 20 wt% Rosolve, 20 wt% methylethylketone and 1.9 wt% 1-hydroxy cyclohexyl phenyl ketone were used.

The hard coat layer forming composition was coated on the TAC film with Mayer No. 10. After coating, it was photocured with UV to form a hard coat layer having a dry thickness of 8 μm. The pencil hardness of the obtained optical film was measured with a 45 degree 1,000 gf load by Hanseung E & I pencil hardness test, and is shown in Table 1 below.

Comparative example  4

In this comparative example, only the hard coat layer was immediately formed without forming a rigid layer on a 80 μm-thick TAC film (Fuji). The hard coating layer-forming composition is 6.7% by weight of methyl methacrylate, 6.7% by weight of pentaerythritol triacrylate, 6.6% by weight of dipentaerythritol hexaacrylate, 10% by weight of methanol, 28.1% by weight of isopropyl alcohol, methyl cellosolve 20% by weight, 20% by weight of methyl ethyl ketone and 1.9% by weight of 1-hydroxy cyclohexyl phenyl ketone were used in combination.

The hard coat layer forming composition was coated on the TAC film with Mayer No. 10. After coating, it was photocured with UV to form a hard coat layer having a dry thickness of 8 μm. The pencil hardness of the obtained optical film was measured with a 45 degree 1,000 gf load by Hanseung E & I pencil hardness test, and is shown in Table 1 below.

TABLE 1

Example 1 (Hard Layer) Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Pencil hardness 5H 3H 2H 1H 1 H

As can be seen in Table 1, the optical film of Example 1 with a rigid layer exhibited excellent pencil hardness compared to the optical films of Comparative Examples 1 to 4 without a rigid layer.

1 is a cross-sectional view of a high-hardness hard coating optical film prepared in Example 1.

Explanation of symbols on the main parts of the drawings

10: plastic film base material 20: rigid layer

30: hard coating layer

Claims (11)

Plastic base film; A rigid layer comprising a thermosetting resin and a photocurable resin in a ratio of 6-9: 1 to 4 by weight on one surface of the plastic base film; And A hard coating layer formed on the rigid layer; High hardness hard coating optical film comprising a. The hard coating of claim 1, wherein the thermosetting resin and the photocurable resin constituting the rigid layer have at least one functional group selected from the group consisting of an unsaturated bond group, an epoxy portion, and a urethane portion in a molecular structure. Optical film. The hard coating optical film of claim 2, wherein the thermosetting resin is at least one melamine resin selected from the group consisting of N-butyl melamine resin and isobutyl melamine resin. The method of claim 2, wherein the photocurable resin is at least one tetrafunctional acrylate oligomer, dipentaerythritol selected from the group consisting of urethane acrylate oligomer, epoxy acrylate oligomer, polyether acrylate, polyester acrylate At least one tetrafunctional acrylate monomer selected from the group consisting of hexa acrylate, dipentaacrythritol hexaacrylate, dipentacristritol pentaacrylate, pentaacrylthiotol tetraacrylate and dipentaerythritol pentaacrylate Trifunctional acrylate monomers or oligomers such as pentaalkyltritol triacrylate, pentaerythritol triacrylate, trimethylolpropane trimethacrylate and trimethylolpropane triacrylate; Bifunctional groups such as polyethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triphenylglycol diacrylate, butanediol diacrylate, hexamethyldiol diacrylate and triethylene glycol diacrylate Acrylate monomers or oligomers; Hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, ethoxyethyl (meth) acrylate, allyl methacrylate, caprolactone acrylate, triethylolpropane methacrylate and methyl methacrylate; A high hardness hard coat optical film, characterized in that it is selected from the group consisting of the same monofunctional acrylate monomers, oligomers thereof and mixtures thereof. The hard coating optical film of claim 1, wherein the rigid layer is formed by curing with thermal curing and photocuring. The hard coating optical film of claim 1, wherein the rigidity of the rigid layer is the largest among the plastic substrate, the rigid layer, and the hard coating layer. The hard coating optical film of claim 1, wherein the rigid layer has a thickness of 2 to 20 μm. The hard coating optical film of claim 1, wherein the hard coating layer has a thickness of 3 to 20 μm. The high hardness hard coating optical film of claim 1, wherein the high hardness hard coating optical film has a pencil hardness of 4H to 7H. The polarizing plate comprising the high-hardness hard-coated optical film of any one of claims 1 to 9. A display device comprising the high hardness hard coat optical film of any one of claims 1 to 9.

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