KR101890005B1 - Opitical self-healing film - Google Patents

Abstract

The present invention provides an optical self-restoring film comprising a base layer, a hard coating layer, and a laminated structure of a magnetic restoration layer having a restoring force against physical deformation, and having a modulus of 60 Mpa to 800 Mpa and a hardness of 10 Mpa to 100 Mpa.

Description

[0001] OPTICAL SELF-HEALING FILM [0002]

An optical restoration film is provided.

An image display surface of an image display device such as a liquid crystal display, a CRT display, a projection display, a plasma display, or an electroluminescence display is required to give scratch resistance so as not to be scratched during handling.

Generally, it is possible to improve the scratch resistance of the image display surface of the image display device by using a layer that adds a hard coating layer to the substrate included in the display or implements antireflection or antireflection.

Also, in recent years, a large number of curved display devices are used, and thus there is an increasing need to develop materials applicable to a fluid display.

An embodiment of the present invention provides an optical magnetic restoration film for optical comprising a hard coating layer having excellent surface hardness and a magnetic restoring layer having a restoring force against physical deformation.

In one embodiment of the present invention, there is provided an optical device comprising a substrate layer, a hard coat layer, and a laminate structure of a magnetic restoration layer having a restoring force against physical deformation, wherein the modulus is from about 60 Mpa to about 800 Mpa, and the hardness is from about 10 Mpa to about 100 Mpa. Thereby providing a magnetic restoration film.

The magnetic restoration layer may be a cured product of a self-restoring coating composition comprising a reactive monomer, a urethane acrylate oligomer having 3 to 6 first functional groups, a photopolymerization initiator, and a solvent.

Wherein said self-restoring coating composition comprises from about 5 parts to about 50 parts by weight of reactive monomer, from about 50 parts to about 95 parts by weight of a urethane acrylate oligomer having from 3 to 6 first functional groups per 100 parts by weight of solids, From about 0.5 parts by weight to about 10 parts by weight of initiator.

The urethane acrylate oligomer may have a weight average molecular weight of from about 1,000 to about 5,000.

The urethane acrylate oligomer may contain at least one second functional group selected from the group consisting of an unsaturated double bond (C═C), an isocyanate group (-NCO), a hydroxyl group (-OH), an ether bond (-O-) .

The hard coating layer may contain a UV curable acrylate resin, an inorganic nanoparticle, a photopolymerization initiator, and a mixed solvent, and the mixed solvent may be a cured product of a hard coating layer composition including a ketone solvent and an alcohol solvent.

The polarity of the mixed solvent may be about 3 to about 5.

The mixed solvent may further include at least one other solvent selected from the group consisting of a hydrocarbon-based solvent, an ester-based solvent, an ether-based solvent, and a glycol-based solvent.

The mixed solvent may comprise about 60% to about 80% by weight of the ketone solvent, about 15% to about 35% by weight of the alcoholic solvent, and about 5% to about 10% by weight of the other solvent.

When the 50% cumulative mass particle size distribution diameter of the inorganic nanoparticles is D50, 5 nm < D50 < 20 nm.

Wherein the hard coat composition comprises about 25 to about 70 parts by weight of an ultraviolet curable acrylate resin, about 1 to about 30 parts by weight of inorganic nanoparticles, about 1 to about 15 parts by weight of a photoinitiator, Can be.

The hard coating composition can form a network structure with inorganic nanoparticles.

The thickness of the magnetic restoration layer may be about 10 [mu] m to about 50 [mu] m.

The thickness of the hard coat layer may be from about 0.1 um to about 1 um.

The pencil hardness of the hard coat layer may be from about 1H to about 9H.

The transmittance of the magnetic restoration film may be about 80% to about 95%.

The haze value of the magnetic restoration film may be about 0.1% to about 5%.

The self-restoring film has excellent magnetic restoration ability against physical deformation, and is excellent in surface hardness and optical characteristics and can be applied to a display product.

1 is a cross-sectional view of an optical magnetic recovery film according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

In one embodiment of the present invention, an optical self-restoring film comprising a base layer, a hard coat layer, and a laminate structure of a magnetic restoration layer having a restoring force against physical deformation and having a modulus of 60 Mpa to 800 Mpa and a hardness of 10 Mpa to 100 Mpa, to provide.

Recently, as a display device equipped with a touch panel evolves into a wearable form or a curved form, the image display surface is vulnerable to external physical changes such as scratches and scratches.

In addition, as the outermost material of the display is changed from a form using flat glass and a strong glass to a form using plastic material or a combination of glass and plastic, a need for a scratch-resistant plastic material has emerged.

In order to overcome the above problems, it was attempted to apply a film having an improved hardness. However, in the case of a bendable structure or a structure that can be worn by a user, a high hardness of the film may cause cracks in the film.

Therefore, when scratches are generated on the image display surface, there is an increasing need for a material in which the scratches are self-healed. In the optical self-restoring film, by introducing a magnetic restoration layer on the image display surface, self-healing .

1 is a cross-sectional view of an optical magnetic recovery film according to an embodiment of the present invention. 1, the optical magnetic recovery film 100 includes a laminated structure of a base layer 10, a hard coating layer 20, and a magnetic restoration layer 30 having a restoring force against physical deformation.

The optical magnetic recovery film 100 may have a modulus of about 60 Mpa to about 800 Mpa and a hardness of about 10 Mpa to about 100 Mpa.

The modulus can be measured by a nanoindentation test method (nanoindenter, nanomechanics) as a value indicating the magnetic restoration characteristic. The larger the modulus, the better the magnetic restoration ability. The smaller the modulus, the weaker the magnetic restoration ability. When the modulus of the film is less than about 60 MPa, the self-recovery function may be delayed. When the modulus of the film exceeds about 800 MPa, the self-recovering function is lost and permanent scratches are left or cracks are generated. Is advantageous in that the magnetic restoration performance can be quickly realized.

The hardness is a value indicating the degree of hardness of the film and can be measured by the nanoindentation test method described above. The hardness of the film is increased as the hardness is increased, so that the film is less affected by the impact due to the external force due to the higher hardness. If the hardness is less than about 10 Mpa, scratches may occur too easily. If the hardness exceeds about 500 Mpa, cracking of the magnetic restoration layer may easily occur due to internal damage when the film itself is bent or dried due to lack of flexibility have. Therefore, by maintaining the hardness in the above range, the filming effect can be easily realized.

By keeping the modulus and the hardness within the above range, the film (100) can secure the characteristics of the film at the same time as the magnetism restoration ability at the same time, has the magnetic restoration ability excellent against the physical deformation, Do.

The magnetic restoration layer 30 is a layer having a restoring force against physical deformation, and can be self-healed without any special treatment when scratches, scratches, or the like occur.

The magnetic restoration layer may be a cured product of a self-restoring coating composition comprising a reactive monomer, a urethane acrylate oligomer having 3 to 6 first functional groups, a photopolymerization initiator, and a solvent.

Specifically, the magnetic restoration layer may be formed by mixing a reactive monomer, a urethane acrylate oligomer having three to six first functional groups, a photopolymerization initiator, and a solvent to form a self restoration coating composition, Coating and ultraviolet ray curing the composition, it is possible to form a film capable of self-restoration simultaneously with the optical property realization due to the magnetic restoration layer.

The reactive monomer may be selected from the group consisting of 2-ethylhexyl acrylate, octyldecyl acrylate, stearyl acrylate, behenyl acrylate, tridecyl methacrylate, nonylphenol ethoxylate monoacrylate, Acrylate, tetrahydrofurfuryl acrylate, tetrahydroperfuryl methacrylate, 4-butylcyclohexyl acrylate, dicyclopentenyl acrylate, dithiocapentenyloxyethyl acrylate, ethoxyethoxyethyl Acrylate, ethoxylated monoacrylate, and combinations thereof, or at least one monofunctional monomer selected from the group consisting of 1,6-hexanediol diacrylate, triphenylglycol diacrylate, butanediol diacrylate, 1 , 3-butylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate , Neopentyl glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, tetraethylene glycol diacrylate, tetraethylene glycol dimethacrylate, triethylene glycol diacrylate 1, selected from the group consisting of ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, dipropylene glycol diacrylate, ethoxylated neopentyl glycol diacrylate, and combinations thereof. Or more bifunctional monomers.

Further, as the above-mentioned reactive monomer, it is possible to use trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, tris (20 hydroxyethyl) isocyanurate triacrylate, and combinations thereof, at least one trifunctional monomer selected from the group consisting of pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, ditrimethylol propane tetraacrylate, Alkoxylated tetraacrylate, and a combination thereof. [0031] The polyfunctional monomer may be at least one selected from the group consisting of a polyfunctional monomer,

The reactive monomer may be added in an amount of 5 parts by weight to 50 parts by weight with respect to 100 parts by weight of the solid content, and the hardness of the magnetic restoration layer can be controlled by including the reactive monomer within the above range.

The photopolymerization initiator may be at least one selected from the group consisting of ethyl benzoin ether, isopropyl benzoin ether,? -Methyl benzoin ethyl ether, benzoin phenyl ether,? -Acyl oxime ester,?,? - diethoxy acetophenone, 2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, anthraquinone, 2- anthraquinone, 2-chloroanthraquinone, thioxanthone, isopropylthioxane Tin, chlorothioxanthone, benzophenone, p-chlorobenzophenone, benzyl benzoate, benzoyl benzoate, and microclerketone.

The photopolymerization initiator may be added in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the solid content. By maintaining the content of the photopolymerization initiator within the above range, the photopolymerization initiator can easily realize a self-restoring effect without UV- .

For example, the solvent may be an alcohol type solvent (methanol, ethanol, isopropanol, butanol, methylcellulose, ethylsorbox), a ketone type (methyl ethyl ketone (Hexane, heptane, octane), benzene (benzene, toluene, xylene) solvents can be used as the solvent.

The solvent may be about 0.1 part by weight to about 50 parts by weight based on 100 parts by weight of the magnetorheological composition. By controlling the viscosity of the composition, the viscosity of the composition can be controlled to improve the solubility, to be.

The self-recovering composition may further contain additives such as a leveling agent, a catalyst, a plasticizer, and an ultraviolet absorber within a range that does not impair the characteristics of the magnetic restoration layer.

The urethane acrylate oligomer having from about 3 to about 6 first functional groups may comprise from about 50 to about 95 parts by weight per 100 parts by weight of solids. The first functional group means an acrylate group contained in the urethane acrylate oligomer, and the acrylate group may be located at the end of the oligomer.

When the oligomer is contained in an amount of less than about 50 parts by weight based on 100 parts by weight of the solid content, the self-restoring function may not be exhibited. When the oligomer is contained in an amount exceeding about 95 parts by weight, the hardness may be lowered.

Since the urethane acrylate oligomer comprises about 3 to about 6 first functional groups, the film 100 can provide improved modulus and hardness values over conventional optical films, .

When the number of the first functional groups is less than about 3, the crosslinking degree may be low, so that sufficient hardness may not be realized. When the number of the first functional groups is more than about 6, the modulus is excessively increased due to too high crosslinking degree. The modulus and hardness characteristics can be exerted at the same time.

The urethane acrylate oligomer may have a weight average molecular weight of from about 1,000 to about 5,000. By maintaining the weight average molecular weight of the oligomer within the above range, the oligomer content can be appropriately maintained to maximize the self restoration effect.

The urethane acrylate oligomer may contain at least one second functional group selected from the group consisting of an unsaturated double bond (C═C), an isocyanate group (-NCO), a hydroxyl group (-OH), an ether bond (-O-) .

The second functional group means a functional group included in the oligomer in addition to the first functional group, and may include about 1 to about 6 functional groups.

By including the second functional group as many as the above number, the modulus and hardness of the film can be more easily realized and the self-healing ability of the magnetic restoration layer can be improved.

For example, the urethane acrylate oligomer may include an ethylene glycol segment or a propylene glycol segment, and the oligomer may exhibit softness by including the segment.

The magnetic restoration layer 30 may include a hard coating layer 20 at a lower portion thereof to ensure a surface hardness. In addition, the hard coating layer 20 can improve the durability and wear resistance of the magnetic restoration film.

The hard coating layer may contain a UV curable acrylate resin, an inorganic nanoparticle, a photopolymerization initiator, and a mixed solvent, and the mixed solvent may be a cured product of a hard coating layer composition including a ketone solvent and an alcohol solvent.

Unlike the self-restoration composition, the hard coating composition includes a mixed solvent. Due to the constant polarity of the mixed solvent, a network structure is formed by inorganic nanoparticles. The hard coating layer formed of the hard coating composition has a small thickness Even if it has, surface hardness is excellent.

The hard coating layer 20 is formed by coating the hard coating composition on the upper surface of the substrate layer 10. Examples of the coating method include a spin coating method, a spray coating method, a casting method, A bar coating method, a roll to roll coating method, a gravure coating method, and a dipping method.

The ultraviolet curable acrylate resin may be formed of any one of the above-mentioned reactive monomers, or may be formed by mixing two or more kinds thereof.

The ultraviolet curing type acrylate resin may be about 25 parts by weight to about 70 parts by weight based on 100 parts by weight of the solid content. When the ultraviolet curing type acrylate resin is less than about 25 parts by weight, cracking may occur in the hard coating layer. When the amount of the ultraviolet curable acrylate resin is more than about 70 parts by weight, the viscosity of the hard coating composition may increase.

The inorganic nanoparticles mean nano-sized inorganic particles and are intended to secure hardness and curl. The inorganic nanoparticles may be at least one selected from the group consisting of silica, alumina, zirconia, zeolite, titanium oxide, and combinations thereof. The use of silica is advantageous in terms of performance and cost, but is not limited thereto.

When the 50% cumulative mass particle size distribution diameter of the inorganic nanoparticles in the particle distribution in the composition is defined as D50, 5 nm < D50 < 20 nm and the inorganic nanoparticles are not completely dispersed, The network structure in the composition can be formed without being aggregated or aggregated.

The inorganic nanoparticles may be about 1 part by weight to about 30 parts by weight based on 100 parts by weight of the solid content. When the inorganic nanoparticles are less than about 1 part by weight, the composition may fail to attain abrasion resistance, and when more than about 30 parts by weight, the inorganic particles may not be dispersed in the hard coating composition.

The photopolymerization initiator is as described above. However, the hard coating composition may contain about 1 part by weight to about 15 parts by weight of the photopolymerization initiator per 100 parts by weight of the solid content. When the amount of the photopolymerization initiator is less than about 1 part by weight, the curing reaction time may be prolonged. When the amount of the photopolymerization initiator is more than about 15 parts by weight, unreacted photopolymerization initiator may remain as an impurity.

The mixed solvent may include a ketone solvent and an alcohol solvent. Examples of the ketone solvent include methyl ethyl ketone, methyl isobutyl ketone, 1-methyl-2-pyrrolidinone, cyclohexanone, and acetone. Examples of the alcohol solvent include propylene glycol monomethyl ether, methanol, ethanol , Isopropyl alcohol, or butyl alcohol.

The polarity of the mixed solvent may be about 3 to about 5. When the polarity of the mixed solvent is less than about 3, the polarity is too low to completely disperse the inorganic nanoparticles to form a network structure of the inorganic nanoparticles. When the polarity is more than about 5, Inorganic nanoparticles can not be dispersed and aggregated.

The mixed solvent may further include at least one other solvent selected from the group consisting of a hydrocarbon-based solvent, an ester-based solvent, an ether-based solvent, and a glycol-based solvent. Examples of the hydrocarbon-based solvent include aliphatic hydrocarbon-based solvents such as hexane and heptane, and aromatic hydrocarbon-based solvents such as anisole, mesitylene and xylene. Examples of the ester-based solvents include methyl acetate, ethyl acetate, propyl acetate, methyl propionate , Ethyl propionate,? -Butyrolactone,? -Valerolactone,? -Caprolactone,? -Valerolactone or? -Caprolactone, and the ether solvents include tetrahydrofuran, 2-methyltetra Hydrofuran or dibutyl ether, and the like.

The mixed solvent may comprise about 60% to about 80% by weight of the ketone solvent, about 15% to about 35% by weight of the alcoholic solvent, and about 5% to about 10% by weight of the other solvent. By mixing the components in the above amounts, the mixed solvent can have a certain degree of polarity, thereby inducing proper dispersion of the inorganic nanoparticles to form a network structure in the hard coating composition.

The hard coating composition may further contain additives such as a leveling agent, a catalyst, a plasticizer, and an ultraviolet absorber within a range that does not impair the properties of the hard coat layer.

The thickness of the magnetic restoration layer 30 may be about 10 um to about 50 um. When the thickness of the magnetically restoring layer 30 is too small, scratches may occur over the entire end face of the magnetically restoring layer when scratches due to an external object occur. In such a case, It is possible to maintain the thickness of the above range and exert the magnetic restoration performance.

The thickness of the hard coat layer 20 may be from about 0.1 um to about 1 um. Although the hard coat layer has a thin thickness as described above, the surface hardness and optical characteristics can be secured due to the network structure of the inorganic nanoparticles. If the thickness of the hard coating layer is too thin, the hard coating property may not be realized. If the thickness of the hard coating layer is too thick, there is a problem of cost increase due to hard coating.

The pencil hardness of the hard coat layer may be from about 1H to about 9H. The hard coat layer 20 has a pencil hardness in the above range, so that excellent abrasion resistance can be realized.

The base layer 10 is excellent in strength so as to prevent scattering of glass such as tempered glass of a touch screen panel and has a transmittance of at least about 90% or more, for example, And may be a film having excellent transparency of about 90% to about 100%.

The base layer 10 may be made of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polycarbonate (PC), polyethylene (polyethylene) PE), polypropylene (PP), or a combination thereof.

The magnetic restoration film includes a hard coating layer formed of a hard coat composition comprising a magnetic restoration layer formed of a magnetoresistive composition including a plurality of urethane acrylate oligomers having a first functional group or a second functional group and a mixed solvent, Modulus and tensile strength within the above range can be realized to exhibit self-restoring property, and at the same time, excellent surface hardness and optical characteristics can be obtained.

Specifically, the transmittance of the magnetic restoration film may be about 80% to about 95%. The haze value of the magnetic restoration film may be about 0.1% to about 5%.

The film can be utilized in an image display apparatus such as a display by maintaining the transmittance and the haze value in the above range.

Hereinafter, specific embodiments of the present invention will be described. However, the embodiments described below are only intended to illustrate or explain the present invention, and thus the present invention should not be limited thereto.

< Example  And Comparative Example >

Example

10 parts by weight of a reactive monomer (trimethylolpropane triacrylate), 84 parts by weight of a urethane acrylate oligomer having 6 acrylate groups, and 6 parts by weight of a photopolymerization initiator (Igacure 184) based on 100 parts by weight of a solid content And diluted with a solvent (methyl ethyl ketone) to a solid content of 50%.

(Polarity = 3) containing 50% by weight of methyl ethyl ketone (MEK) as a ketone solvent, 45% by weight of propylene glycol monomethyl ether (PGME) as an alcohol solvent and 5% by weight of methyl acetate as another solvent A hard coat composition for forming a network structure was prepared by mixing 30 parts by weight of ultraviolet curable acrylate resin, 20 parts by weight of silica having a size of about 10 nm and 10 parts by weight of benzophenone based on 100 parts by weight of the mixed solvent and the mixed solvent. .

The hard coating composition was coated on the PET film by roll-to-roll coating, followed by drying and UV curing to form a hard coating layer having a thickness of 550 nm. The magnetic restoration coating composition was applied onto the hard coating layer, Cured to form a magnetic restoration layer having a thickness of 20 [mu] m to prepare a magnetic restoration film.

Comparative Example  One

A magnetic restoration film was produced in the same manner as in Example 1, except that the magnetic restoration layer was formed.

Comparative Example  2

A magnetic restoration film was prepared in the same manner as in Example 1 except that the hard coating layer was formed.

< Experimental Example > - Characteristic of magnetic restoration film

1) Modulus and hardness: The modulus of the above Examples and Comparative Examples was measured by a nanoindentation test method using a nanoindenter device.

2) Transmittance and haze: Total light transmittance and haze value of the above Examples and Comparative Examples were measured using NDH5000 (Nippon Densuku Co.).

3) Magnetic Recovery Rate: The magnetic recovery rate values of the above Examples and Comparative Examples were measured by using a video recorder and scratching with a brass brush and then recovering time.

4) Pencil hardness: Pencil hardness of the above Examples and Comparative Examples were measured using a weight of 750 g according to JIS K5600-5-4.

5) Tensile Strength: The maximum tensile strengths of the above Examples and Comparative Examples were measured using UTM (Universal Test Machin) equipment according to ASTM D 638.

Self restorability Optical properties Self restoration
Speed (sec) pencil
Hardness Seal
burglar
(MPa) One 2 3 Average Transmittance
(%) Hayes
(%) City Modulus
(Mpa) 68.87 71.34 71.52 70.58 90 1.5 5 F 100 Hardness
(Mpa) 19.18 20.12 21.31 20.20 Modulus
(Mpa) 2010.1 2003.2 1998.2 2003.8 89 1.3 Not restored F 65 Hardness
(Mpa) 340.9 338.1 340.2 339.7 Modulus
(Mpa) 62.14 63.37 69.44 64.98 85 2 7 2B 79 Hardness
(Mpa) 15.98 16.23 16.3 16.17

Comparative Example 1 does not include a magnetic restoration layer, and it was found that the magnetic restoration function was not achieved due to the remarkably high modulus and hardness value.

On the other hand, the embodiment and the comparative example 2 include a magnetic restoration layer, and the values of modulus, hardness and magnetic restoration speed were measured similarly. However, it was found that the examples contained a hard coating layer, and Comparative Example 2 did not include a hard coating layer, and thus the pencil hardness and tensile strength of the Example were superior to those of Comparative Example 2.

100: magnetic restoration film
10: substrate layer
20: hard coat layer
30: magnetic restoration layer

Claims (17)

A laminated structure of a base layer, a hard coat layer, and a magnetic restoration layer having a restoring force against physical deformation,
The magnetic restoration layer is a cured product of a self-restoring coating composition comprising a reactive monomer, a urethane acrylate oligomer having 3 to 6 first functional groups which is an acrylate group, a photopolymerization initiator and a solvent,
Wherein the hard coat layer comprises 25 to 75 parts by weight of an ultraviolet curing type acrylate resin per 100 parts by weight of a solid content; 1 part by weight to 30 parts by weight of inorganic nanoparticles; 1 part by weight to 15 parts by weight of a photopolymerization initiator; And a mixed solvent comprising a ketone-based solvent and an alcohol-based solvent,
The thickness of the magnetic restoration layer is 20 占 퐉 to 50 占 퐉,
The thickness of the hard coat layer is 0.1 占 퐉 to 1 占 퐉,
A modulus of 60 MPa to 800 MPa, a hardness of 10 MPa to 100 MPa
Optical self - restoring film.
delete The method according to claim 1,
Wherein the self restoration coating composition comprises 5 to 50 parts by weight of the reactive monomer, 50 to 95 parts by weight of the urethane acrylate oligomer, and 0.5 to 10 parts by weight of the photopolymerization initiator, based on 100 parts by weight of the solid content
Optical self - restoring film.
The method according to claim 1,
The urethane acrylate oligomer has a weight average molecular weight of 1,000 to 5,000
Optical self - restoring film.
The method according to claim 1,
The urethane acrylate oligomer may contain one second functional group selected from the group consisting of an unsaturated double bond (C═C), an isocyanate group (-NCO), a hydroxyl group (-OH), an ether bond (-O-) More included
Optical self - restoring film.
delete The method according to claim 1,
The polarity of the mixed solvent is 3 to 5
Optical self - restoring film.
The method according to claim 1,
Wherein the mixed solvent further comprises one other solvent selected from the group consisting of a hydrocarbon-based solvent, an ester-based solvent, an ether-based solvent and a glycol-based solvent
Optical self - restoring film.
9. The method of claim 8,
Wherein the mixed solvent comprises 60 wt% to 80 wt% of the ketone solvent, 15 wt% to 35 wt% of the alcohol solvent, and 5 wt% to 10 wt% of the other solvent
Optical self - restoring film.
The method according to claim 1,
When the 50% cumulative mass particle size distribution diameter of the inorganic nanoparticles is D50, it is preferable that 5nm < D50 < 20nm
Optical self - restoring film.
delete The method according to claim 1,
The hard-coating composition may be used to form a network structure by inorganic nanoparticles
Optical self - restoring film.
delete delete The method according to claim 1,
The pencil hardness of the hard coat layer is from 1H to 9H
Optical self - restoring film.
The method according to claim 1,
The transmittance of the self-restoring film is preferably 80% to 95%
Optical self - restoring film.
The method according to claim 1,
The haze value of the magnetic restoration film is preferably 0.1% to 5%
Optical self - restoring film.

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