KR101993002B1 - Optical hardcoating film - Google Patents

Abstract

The present invention relates to a base film; A hard coating layer formed on one surface of the base film; An oligomer blocking layer formed on the back surface of the base film; And an anti-blocking layer formed on the hard coating layer. The hard coating film of the present invention has excellent surface hardness, while preventing precipitation of oligomers on the surface of the film and reducing the frictional force of the surface Exhibits anti-blocking properties, exhibits low diffused reflection, exhibits a high light transmittance, has a low haze value, and can be usefully used for optical applications, particularly for protecting panels of liquid crystal display devices.

Description

[0001] OPTICAL HARDCOATING FILM [0002]

The present invention relates to a hard coat film for optical purposes.

Description of the Related Art [0002] A liquid crystal display (LCD) is one of widely used flat panel display devices. A liquid crystal material is injected between two transparent substrates (glass substrates) and a voltage is applied from the outside, to be.

Recently, the use of materials constituting the liquid crystal display device is increasing as the use of the liquid crystal display device is increasing. Among them, various transparent plastic materials are widely used especially in parts where high transparency is required, while replacing materials such as metals and glass. Among them, the surface of the panel of the liquid crystal display element is exposed to the outside, so a hard coating film for protecting the panel from various external stimuli is used.

The hard coating film may be a film having a hard coating layer formed on one side or both sides of the base film. In the film having the hard coating layer formed only on a side surface thereof, the surface on which the hard coating layer is not formed may include an external stimulus (Cyclic trimer), which is a non-crosslinked component of the base film, is precipitated on the surface of the film when heat is applied to the produced film.

Accordingly, in Korean Patent Laid-Open Publication No. 2011-0095915, a part of the surface of a film base material is exposed by ultraviolet rays to prevent precipitation of oligomers on the surface of the hard coating film. However, such a modified film does not consider the light transmittance and the low haze value which are essential for use as an optical film. On the other hand, when the hard coating film is wound and stored in a roll state, the activity may not be excellent due to interlayer adhesion or chemical force, which may cause blocking and damage to the plastic substrate film or the coating layer of the film.

Therefore, it is possible to provide a hard coating film having excellent surface hardness, preventing oligomer precipitation on the film surface, reducing the frictional force of the surface, exhibiting anti-blocking property, exhibiting low diffused reflection, exhibiting high light transmittance, .

Accordingly, an object of the present invention is to provide a film having excellent surface hardness, preventing precipitation of oligomers on the surface of the film, reducing the frictional force of the surface, exhibiting anti-blocking property, exhibiting low diffused reflection, exhibiting high light transmittance, Lt; RTI ID = 0.0 > a < / RTI >

In order to achieve the above object,

A base film;

A hard coating layer formed on one surface of the base film;

An oligomer blocking layer formed on the back surface of the base film; And

And an anti-blocking layer formed on the hard coating layer.

The hard-coating film of the present invention has excellent surface hardness, prevents deposition of oligomers on the surface of the film, reduces the frictional force of the surface, exhibits anti-blocking property, exhibits low diffused reflection, exhibits high light transmittance, And thus can be usefully used for optical applications, particularly for protecting panels of liquid crystal display devices.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic view showing a cross section of a hard coating film according to one embodiment of the present invention. FIG.
2 is a diagram schematically showing a cross section of a hard coating film according to another embodiment of the present invention.

The hard coat film of the present invention comprises a base film; A hard coating layer formed on one surface of the base film; An oligomer blocking layer formed on the back surface of the base film; And an anti-blocking layer formed on the hard coating layer.

1. Base film

The base film is not particularly limited as long as it is a transparent film. Examples of the resin constituting the base film include polyethylene, polypropylene, polystyrene, polycarbonate, polyethylene naphthalate, polyethylene terephthalate, polybutylene terephthalate, triacetylcellulose, Polyvinyl chloride, and mixtures thereof. The base film can be suitably formed by a general melt extrusion method or a solution casting method. However, in order to increase the mechanical strength or optical function, the film may be subjected to uniaxial stretching or biaxial stretching.

The thickness of the base film may be appropriately selected depending on the material, but may be 20 to 500 탆, and preferably 20 to 300 탆.

2. Hard coating layer

The hard coating layer is formed on one side of the base film and is provided to increase the surface hardness of the film to prevent scratches on the surface.

The hard coating layer may be formed of a resin such as a thermoplastic resin, a thermosetting resin, and an ionizing radiation curable resin. The hard coating layer may preferably be composed of ionizing radiation (ultraviolet ray or electron beam) curable resin so as to exhibit high hard coating properties, .

Specific examples of the thermoplastic resin and the thermosetting resin include a polyester resin, an acrylic resin, an acrylic urethane resin, a polyester acrylate resin, a polyurethane acrylate resin, an epoxy acrylate resin, a urethane resin, an epoxy resin, a poly Based resin, a melamine-based resin, a phenol-based resin, a silicone-based resin, and a mixture thereof, and the like can be given.

As the ionizing radiation curable resin, a photopolymerizable prepolymer which is crosslinked and cured by irradiation with ionizing radiation can be used. Examples of the photopolymerizable prepolymer include a cationic polymerization prepolymer and a radical polymerization prepolymer.

Examples of the cationic polymerization type photopolymerizable prepolymer include epoxy resins and vinyl ether resins. Examples of the epoxy resins include bisphenol-based epoxy resins, novolak-type epoxy resins, alicyclic epoxy resins, aliphatic epoxy resins, And the like.

As the radically polymerizable photopolymerizable prepolymer, an acrylic prepolymer (hard prepolymer) having two or more acryloyl groups in one molecule and having a three-dimensional network structure through crosslinking and curing can be particularly preferably used from the viewpoint of hard coatability .

Examples of the acrylic type prepolymer include urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate, polyfluoroalkyl acrylate, silicone acrylate, and mixtures thereof.

The urethane acrylate-based prepolymer can be obtained, for example, by esterifying a polyurethane oligomer obtained by a reaction of a polyether polyol or a polyester polyol with a polyisocyanate through a reaction with (meth) acrylic acid.

The polyester acrylate-based prepolymer may be obtained by, for example, esterifying a hydroxyl group of a polyester oligomer having hydroxyl groups at both terminals obtained by condensation of a polyvalent carboxylic acid and a polyhydric alcohol with (meth) acrylic acid, (Meth) acrylic acid at the terminal hydroxyl group of an oligomer obtained by adding a seed.

The epoxy acrylate-based prepolymer can be obtained by, for example, esterifying a bisphenol-type epoxy resin having a relatively low molecular weight or an oxirane ring of a novolac epoxy resin with a (meth) acrylic acid.

The hard coat layer of the present invention may further comprise a photopolymerizable monomer for imparting various performances such as improvement of crosslinking curability or adjustment of curing shrinkage.

Examples of the photopolymerizable monomer include monofunctional acrylic monomers (e.g., 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, butoxyethyl acrylate, etc.), bifunctional acrylic monomers For example, 1,6-hexanediol diacrylate, neopentyl glycol acrylate, diethylene glycol diacrylate, polyethylene glycol diacrylate, hydroxypivalic acid ester neopentyl glycol diacrylate, etc.), trifunctional or higher acryl And monomers (e.g., dipentaerythritol hexaacrylate, trimethyl propane triacrylate, pentaerythritol triacrylate, etc.).

The term "acrylate" includes methacrylate in addition to acrylate. These photopolymerizable monomers may be used alone or in combination of two or more.

When the hard coat layer is formed by curing by ultraviolet irradiation, the hard coat layer may further comprise a photopolymerization initiator in addition to the photopolymerizable prepolymer and the photopolymerizable monomer.

As the photopolymerization initiator, any conventional initiator generally used for curing the ultraviolet curable resin can be used, and examples thereof include oxime ester, acetophenone, benzophenone, benzoin and benzoyl, xanthone, triazine, halomethyl A photoinitiator such as an oxadiazole series or a ropin dime group can be used. These may be used alone or in combination of two or more.

The photopolymerization initiator may be contained in an amount of usually 0.2 to 10 parts by weight based on 100 parts by weight of the total of the photopolymerizable prepolymer and the photopolymerizable monomer.

The hard coat layer of the present invention may contain further additives as necessary insofar as the effect of the present invention is not impaired.

The additive may be at least one selected from the group consisting of a surface control agent, a lubricant, a coloring agent, a pigment, a dye, a fluorescent whitening agent, a flame retardant, an antibacterial agent, a fungicide, an ultraviolet absorber, a light stabilizer, a heat stabilizer, an antioxidant, Antifoaming agents, dispersants, storage stabilizers, crosslinking agents or silane coupling agents.

The hard coat layer may have a thickness of 0.1 to 30 탆, preferably 0.5 to 15 탆, more preferably 1 to 10 탆. If the thickness is less than 0.1 탆, it is not preferable because a sufficient hardness of the hard coat layer can not be exhibited. If the thickness exceeds 30 탆, the haze may increase, the transmittance may decrease or the film adhesion may be decreased.

The hard coat layer may have a surface hardness of not less than 1H, preferably not less than 2H, more preferably not less than 3H. The value of the surface hardness is a value represented by pencil hardness measured by a method in accordance with JIS-K5400 (1990).

3. Oligomer blocking layer

An oligomer blocking layer is formed on the back surface of the base film of the hard coating film of the present invention, on which the hard coating layer is formed.

The oligomer blocking layer is a layer formed on the surface of the base film to prevent oligomers present in the base film from crystallizing and precipitating when the hard coating film of the present invention is heat-treated.

The oligomer blocking layer may be made of a resin such as a thermoplastic resin, a thermosetting resin, or an ionizing radiation curable resin in the same manner as the hard coating layer, and the resin constituting the hard coating layer and the oligomer blocking layer may be the same or different from each other .

Examples of the thermoplastic resin, thermosetting resin or ionizing radiation curable resin are the same as those in the above-mentioned hard coating layer, and photopolymerization initiators and additives are the same as those in the hard coating layer.

The oligomer blocking layer may have a thickness of 0.1 to 10 mu m, preferably 0.1 to 5 mu m, more preferably 0.1 to 2 mu m. If the thickness is less than 0.1 m, it is not preferable because sufficient oligomer precipitation preventing effect can not be exhibited. If the thickness exceeds 10 m, the haze may increase, the transmittance may decrease, or the film adhesion may be decreased.

The oligomer blocking layer may exhibit a function of increasing the surface hardness of the film in addition to the effect of preventing oligomer precipitation.

4. Anti-blocking layer

The hard coat film of the present invention comprises an anti-blocking layer formed on the hard coat layer.

The anti-blocking layer is a layer for realizing anti-blocking property and antifouling property and may be made of a resin such as thermoplastic resin, thermosetting resin or ionizing radiation curable resin as well as the hard coating layer and oligomer blocking layer, And the like.

Since the anti-blocking layer has fine irregularities formed on its surface, the anti-blocking property of the anti-blocking layer is reduced to reduce the frictional force of the surface. In addition to the anti-blocking property, the anti-blocking layer can reduce the diffuse reflection of the hard coating film and exhibit high light transmittance , And can also reduce the haze.

To this end, the anti-blocking layer comprises a filler.

The filler may be an organic particle, an inorganic particle, or a mixture thereof. Examples of the organic particle include polymethyl methacrylate (PMMA) and acrylic. Examples of the inorganic particle include silica, alumina, metal oxide, Zirconium and clay. The inorganic particles may be surface treated with an organic compound such as a silane coupling agent, a polyol, an alkylol amine, or a titanate coupling agent to facilitate dispersion.

The filler may have an average particle size of 10 to 250 nm, preferably 50 to 200 nm.

The filler may be contained in an amount of 0.1 to 60 parts by weight, preferably 1 to 30 parts by weight, based on 100 parts by weight of the resin constituting the anti-blocking layer.

In addition, the anti-blocking layer may further include a silicon-based compound or a fluorine-based compound, and these compounds may enhance antifouling performance as well as antifouling property.

The silicon-based compound is not particularly limited as long as it is a compound having a siloxane (Si-O) bond, and may be a liquid (meth) acrylate polysiloxane compound having a molecular weight of 100 to 10,000 or a (meth) acrylate organic-modified polysiloxane compound . The fluorine-based compound may be a resin having a structure in which part or all of hydrogen of polyethylene is substituted with fluorine, and has a molecular weight of 100 to 10,000.

The silicone compound or the fluorine compound may be used singly or in combination, and may be contained in an amount of 0.1 to 30 parts by weight, preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the resin constituting the anti-blocking layer.

If the amount of the resin containing the silicone compound or the fluorine compound is less than 0.1 part by weight, the antifouling function is not sufficient and the function of strengthening the anti-blocking property can not be exhibited, and if it exceeds 30 parts by weight, There is a problem and it is not desirable.

The anti-blocking layer may have a thickness of 0.1 to 10 mu m, preferably 0.1 to 5 mu m, more preferably 0.1 to 2 mu m. If the thickness is less than 0.1, there is a problem that the thickness of the anti-blocking layer is too small, so that it is difficult to fix the filler in the anti-blocking layer. When the thickness exceeds 10 μm, there is a fear that the haze increases, the transmittance decreases, Therefore, it is not preferable.

The anti-blocking layer preferably has a surface roughness (Ra) of 0.01 to 0.5 탆. If the surface roughness is less than 0.01 탆, a sufficient anti-blocking effect can not be exhibited, which is not preferable.

5. Overcoat layer

The hard coat film of the present invention may further comprise an overcoat layer on the oligomer blocking layer and / or the anti-blocking layer.

The overcoat layer may be formed on the oligomer blocking layer and / or the anti-blocking layer to function to compensate for the adhesion force which may be insufficient when the hard coating film of the present invention is used for a panel or the like of a liquid crystal display device. For example, when a panel or the like of a liquid crystal display element in which the hard coating film of the present invention is used is made of a material which can not easily adhere to a resin constituting the oligomer blocking layer and / or the anti-blocking layer, It is possible to perform a function of compensating for insufficient adhesion force by overcoating with a material which smoothly adheres to a material constituting a panel or the like of a liquid crystal display element.

The overcoat layer may be formed on the oligomer blocking layer and / or the anti-blocking layer so that the surface of the hard coating film has a surface contact angle of 90 DEG or less, preferably 40 to 90 DEG have.

The overcoat layer may be made of, for example, a polyvinyl alcohol resin, an acrylate resin, a urethane acrylate resin, or the like, preferably an acrylate resin, and made of a material having hydrophilic property such that its surface contact angle is 90 ° or less .

In addition to the partially saponified polyvinyl alcohol or fully saponified polyvinyl alcohol, the polyvinyl alcohol resin may be a modified polyvinyl alcohol such as a carboxyl group denatured polyvinyl alcohol, an acetoacetyl group denatured polyvinyl alcohol, a methylol group denatured polyvinyl alcohol, an amino group denatured polyvinyl alcohol, Vinyl alcohol-based resin.

The overcoat layer may be an aqueous or solvent-based coating depending on the characteristics of the raw material, and may be cured by thermal curing or UV curing.

The overcoat layer may further lower the contact angle of the surface through the surface treatment. As the surface treatment method, corona treatment or plasma treatment may be used.

The conditions of the corona treatment are not particularly limited and may be adjusted within a range that does not affect the surface of the overcoat layer. The discharge amount may be 50 to 600 W · min / m 2, preferably 100 to 300 W · min / M < 2 >. When the discharge amount is less than 50 W · min / m 2, the hydrophilic reforming effect is insufficient. When the discharge amount is more than 600 W · min / m 2, the formed coating layer may be destroyed.

The conditions of the plasma treatment are not particularly limited and can be adjusted within a range that does not affect the surface of the overcoat layer. As the process gas, air and N ₂ gas are used. The discharge amount may be 50 to 3,000 W · min / m 2, and may be 600 to 1,200 W · min / m 2.

The overcoat layer may have a thickness of 0.1 to 10 mu m, preferably 0.1 to 5 mu m, more preferably 0.1 to 2 mu m.

The hard coating film of the present invention is formed by applying a hard coating layer resin composition and an oligomer blocking layer resin composition on each surface of a base film and curing the same to form a hard coating layer and an oligomer blocking layer on each surface of the base film , Coating the anti-blocking layer resin composition on the hard coat layer, and curing the anti-blocking layer resin composition to form an anti-blocking layer.

The application is performed by applying the resin composition to a desired wet-coating thickness, for example, 2 to 25 占 퐉, using a spin or slit coating method, a roll coating method, a screen printing method, Followed by heating at a temperature of 50 to 150 DEG C for 1 to 10 minutes to remove the solvent.

The curing can be performed by irradiating the active line at 200 to 450 nm. As the light source used for the irradiation, a low-pressure mercury lamp, a high-pressure mercury lamp, a high-pressure mercury lamp, a metal halide lamp, an argon gas laser, and the like can be used. The exposure dose varies depending on the kind of each component of the composition, the blending amount and the dried film thickness, but may be 100 mJ / cm ² (at a wavelength of 365 nm) or less when a high-pressure mercury lamp is used.

After forming a hard coating layer, an oligomer blocking layer and an anti-blocking layer and optionally an over coating layer on the base film, heat is applied at a temperature of 140 ° C or more for 30 seconds or more while running the film for adjusting the heat shrinkage rate of the product. Can be processed.

Through this post-treatment, the heat shrinkage rate of the film can be adjusted to 0.5% or less, preferably 0.3% or less.

The hard coat film of the present invention may have a haze value of 1.0% or less, preferably 0.5%.

Accordingly, the present invention also provides a liquid crystal display element comprising the hard coat film.

Figs. 1 and 2 show schematically a cross section of a hard coating film according to an embodiment of the present invention.

1, a hard coating layer 20 is formed on one surface of a substrate film 10, and an oligomer blocking layer 30 is formed on a back surface of the substrate film 10. An anti-blocking layer 40 is formed on the hard coat layer 20.

Referring to FIG. 2, the hard coating film of the present invention has an overcoat layer 50 formed on the anti-blocking layer 40 and the oligomer blocking layer 30 in the hard coating film as shown in FIG. 1 Lt; / RTI >

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples are intended to illustrate the present invention, but the scope of the present invention is not limited thereto.

Example 1

1. Formation of hard coat layer

5 parts by weight of a photoinitiator (IRGACURE 184, manufactured by BASF) was added to 60 parts by weight of an acrylate resin M600 (made by MI Chemical Co., Ltd.), 20 parts by weight of M340 (manufactured by MIWON CORPORATION) and 20 parts by weight of M200 (Hereinafter referred to as " MEK ") as a solvent so that the total solid concentration was 45 parts by weight, and stirred to prepare a hard coat layer resin composition.

The resin composition was applied to one side of a polyester base film (A4300, Toyobo Co., Ltd.) having a thickness of 100 탆 using a Meyer bar coater, dried at 80 캜 for 2 minutes, and then irradiated with a high pressure mercury ultraviolet lamp And irradiated under the conditions of an integrated light quantity of 100 mJ / cm ² and cured to form a hard coat layer having a thickness of 2 탆.

2. Formation of oligomer blocking layer

An oligomer blocking layer having a thickness of 0.1 占 퐉 was formed on the back surface of the base film on which the hard coating layer was formed by the same method as the hard coating layer.

3. Formation of anti-blocking layer

As a filler, methyl isobutyl ketone (hereinafter referred to as MIBK) (hereinafter referred to as " MIBK ") was added as a solvent so that the total solid concentration was 10 parts by weight, the hard coating resin SS-ABHC- ), And stirred to prepare an anti-blocking layer resin composition.

The anti-blocking layer resin composition, which was uniformly mixed on the hard coat layer, was applied using a bar coater, dried at 80 ° C for 2 minutes, and then developed under the conditions of an integrated light quantity of 100 mJ / cm ² of a high pressure mercury ultraviolet lamp And cured to form an anti-blocking layer having a thickness of 0.2 mu m.

The hard coat film was post-treated at 150 ° C for 1 minute to improve the thermal characteristics of the film.

Example 2

In addition, a silicone additive (RAD2250 manufactured by TEGO Co., Ltd.) was further added as an additive in an amount of 0.5 part by weight based on 100 parts by weight of the hard-coating resin for the anti-blocking layer in the process of forming the anti-blocking layer to prepare an anti- A hard coat film was prepared in the same manner as in Example 1, except that

Example 3

Except that the hard coat resin composition prepared in the process of forming the hard coat layer was added with organic particles having a particle size of 0.1 to 0.3 탆, EA1135 (manufactured by GANZ) so as to have an anti-blocking property so as to be 100 wt% To prepare a hard coating film.

Example 4

100 parts by weight of water, 5 parts by weight of polyvinyl alcohol resin and 0.1 part by weight of diethylene triamine as a crosslinking agent were stirred in a stirrer for 1 hour to prepare an overcoat resin composition.

The hard coating layer, the anti-blocking layer and the oligomer blocking layer were prepared in the same manner as in Example 1, and then the overcoat layer resin composition was coated on the anti-blocking layer and the oligomer blocking layer using a bar coater. And dried for a minute to produce a film.

The film was placed in a convection oven and dried at 140 ° C for 1 minute to obtain a hard coating film.

Comparative Example 1

A hard coat film was prepared in the same manner as in Example 1 except that no anti-blocking layer was formed. However, the post-treatment for improving the thermal properties of the film did not proceed after the production of the film.

Comparative Example 2

A hard coat film was prepared in the same manner as in Example 3, except that an anti-blocking layer was formed using an anti-blocking layer resin composition using a hard coating resin not containing a filler. However, the post-treatment for improving the thermal properties of the film did not proceed after the production of the film.

Test Example 1: Measurement of pencil hardness

Evaluation pencil (Mitsubishi Co., uni) with a pencil hardness tester (Heidon Co., 14FW) Examples 1 to 4 and Comparative Examples 1 and 2, the hard coat 500 kg / for the anti-blocking layer cm of the film ² obtained in using for The resultant pencil hardness was measured with a load of 0.5 mm / sec. The results are shown in Table 1 below.

Test Example 2: Measurement of light transmittance and haze

The light transmittance and haze of the hard coating films obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were measured based on JIS K 7105 using HM-150 manufactured by Murakami Color Research Lab, Respectively.

Test Example 3: Anti-blocking property

The static and dynamic friction coefficients of the products were measured according to ASTM D1894 using the hard coating films obtained in Examples 1 to 4 and Comparative Examples 1 and 2. The coefficient of friction was measured by comparing the samples prepared under the respective conditions with each other. The measurement results are summarized as follows.

○: Stop and kinetic friction coefficient is less than 0.4

X: Static and kinetic friction coefficient of 0.4 or more

Test Example 4: Measurement of surface contact angle

The hard coating film obtained in Examples 1 to 4 and Comparative Examples 1 and 2 was cut into a size of 5 cm x 5 cm and then contacted with water contact angle at five points on each of the front and back surfaces using a contact angle meter (DSA-100, KRUSS) And the average value of the results was shown.

Test Example 5: Measurement of heat shrinkage

The hard coating films obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were cut into a size of 20 cm x 20 cm in accordance with JIS C 2151 and then heated at 150 캜 for 30 minutes, Heat shrinkage was measured. The heat shrinkage ratio in the MD direction and the TD direction of the film in two directions was measured, and the average value thereof was shown.

Pencil hardness Light transmittance
(%) Hayes
(%) Anti-blocking property Surface contact angle Heat shrinkage
(MD,%) Example 1 2H 91.5 0.5 O 76 0.3 Example 2 2H 91.4 0.5 O 98 0.3 Example 3 2H 91.2 0.5 O 75 0.3 Example 4 2H 91.4 0.5 O 75 0.3 Comparative Example 1 2H 91.4 0.5 X 75 0.8 Comparative Example 2 2H 91.3 0.5 X 75 0.8

From the results shown in Table 1, it can be seen that the hard coating films of Examples 1 to 4 are excellent in hardness and light transmittance, have a low haze value and a small surface contact angle, have excellent anti-blocking properties, and have a low heat shrinkage rate. Particularly, the hard coating film of Example 2 has antifouling property by including a silicone additive in the formation of the anti-blocking layer, which can be confirmed by the contact angle.

On the other hand, in the hard coating films of Comparative Examples 1 and 2, the anti-blocking layer was not formed or the anti-blocking layer did not contain a filler for exhibiting anti-blocking property, and the coefficient of static and dynamic friction of the film was high. In addition, the films of Comparative Examples 1 and 2 were not post-treated, and the heat shrinkage ratio of the film was relatively high.

Claims (10)

A base film;
A hard coating layer formed on one surface of the base film;
An oligomer blocking layer formed on the back surface of the base film; And
An anti-blocking layer formed on the hard coat layer; And
An overcoat layer formed on the surface of the oligomer blocking layer, the anti-blocking layer, or both,
Wherein the overcoat layer has a surface contact angle of 40 to 90 DEG.
The method according to claim 1,
Wherein the hard coating layer has a thickness of 0.1 to 30 占 퐉 and a surface hardness of 1H or more.
The method according to claim 1,
Wherein the oligomer blocking layer has a thickness of 0.1 to 10 mu m.
The method according to claim 1,
Wherein the anti-blocking layer comprises at least one filler selected from the group consisting of polymethylmethacrylate (PMMA), acrylic, silica, alumina, metal oxide, zirconium oxide and clay.
The method according to claim 1,
Wherein the anti-blocking layer has a thickness of 0.1 to 10 mu m and a surface roughness (Ra) of 0.01 to 0.5 mu m.
delete delete The method according to claim 1,
Wherein the overcoat layer has a thickness of 0.1 to 10 mu m.
The method according to claim 1,
Wherein the hard coating film has a heat shrinkage of 0.5% or less.
The method according to claim 1,
Wherein the hard coating film has a haze of 1.0% or less.

Images