KR20160079992A - Smudge-free low reflective index hard coat film - Google Patents

Abstract

The present invention provides a low refractive index hard coat film having an anti-smudge function, which is a stack film including a base film of a polymer material and a low reflective index hard coat layer formed on at least one surface of the base film. The hard coat layer is formed from a thermosetting resin composition, the thickness of the hard coat layer is formed to be less than or equal to 5 μm, when the hardness of the hard coat layer is measured using a pencil hardness measurement method, the hard coat layer has characteristics of H or more at a weight of 1 kg, and prevents smudges from being generated even after a reliability test at a temperature of 85°C/a relative humidity of 85%. According to the present invention, the low refractive hard coat film can be hardened at a high rate, can improve light transmitting properties, and can prevent smudges from being generated on the surface thereof after a reliability test thereof under high-temperature and high-humidity conditions.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a low refractive hard coat film having anti-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low refractive hard coat film having anti-staining property, and more particularly, to a hard coat film comprising a thermosetting resin composition comprising a silicone acrylate hybrid resin, , And a low refractive hard coat film which does not cause surface unevenness after reliability evaluation under high temperature and high humidity conditions.

In order to replace ITO and ZTO used in the conventional touch panel, a product in which a metal mesh and a silver nanowire layer are formed on a base film has attracted attention.

However, unlike conventional ITO, in the case of metal and silver nano wire, it is impossible to transmit light, so that it can only suffer damage at the total light transmittance. However, the pattern size of metal or nanowire is made very thin or an anti- And a method for supplementing the same is used.

The hard coat film used for this purpose usually has a configuration in which a high refractive index hard coating layer and a low refractive hard coating layer are sequentially laminated on a base film. However, in such a case, the high cost of the antireflection film itself is disadvantageous in terms of cost, and it is inevitable that the hard coat layer and the low refractive layer are formed on the upper surface, and the particles of the low refractive layer are exposed on the surface. Therefore, in the reliability evaluation under high temperature and high humidity, there may occur a phenomenon in which particles between the particles and the particles are not removed, such as fine dust, water and the like.

An object of the present invention is to provide a low refractive hard coat film which is excellent in light transmittance but does not cause surface unevenness after reliability evaluation under high temperature and high humidity conditions.

The present invention provides a laminated film comprising a base film of a polymer material and a low refractive hard coat layer formed on at least one surface of the base film, wherein the hard coat layer is formed of a thermosetting resin composition, And provides a low refractive hard coat film having a stain-preventing performance that does not cause stains even after a reliability test of 120 hours at 85 ° C / 85% -relative humidity, and has a characteristic of H or higher at a load of 1 kg under pencil hardness measurement do.

The thermosetting resin composition may include a silicone acrylate hybrid resin represented by the following chemical formula (1).

[Chemical Formula 1]

X is a molecular chain having a (meth) acryloxy functional group as a reactive group, R ₁ and R ₂ are selected from hydrogen, a C _{1 to} C ₆ alkyl group or a C _{1 to} C ₆ alkoxy group, R ₃ is hydrogen or a C _{1 to} C ₆ alkyl group, and Y is an integer of 1 to 2500.

It is preferable that the thermosetting resin composition further contains 30 parts by weight or less of a fluorine-modified acrylic resin with respect to 100 parts by weight of the silicone acrylate hybrid resin.

It is preferable that the thermosetting resin composition further contains inorganic fine particles in an amount of 50 parts by weight or less based on 100 parts by weight of the silicone acrylate hybrid resin.

The hard coating layer may be formed by curing the thermosetting resin composition at a temperature of 100 to 180 ° C for 1 minute or less.

The refractive index of the hard coat film is preferably 1.3 to 1.47.

In the low refractive hard coat film according to the present invention, a hard coat layer is formed in a thermosetting manner by using a resin composition containing a silicone acrylate hybrid resin. Therefore, the curing speed is higher than that of the photocurable resin, and the productivity is improved, which is advantageous in terms of cost.

In addition, the low refractive hard coat film according to the present invention can form a low refractive layer without using the refractive index controlling inorganic particles and secures excellent light transmittance as compared with the conventional acrylic resin or urethane acrylic resin.

The low refractive hard coat film according to the present invention does not cause surface unevenness after reliability evaluation in high temperature and high humidity conditions even when the hard coat layer contains inorganic particles.

1A and 1B are schematic cross-sectional views of a low refractive hard coat film according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

1A and 1B are schematic cross-sectional views of a low refractive hard coat film having antifouling performance according to the present invention. 1A and 1B, a low refractive hard coat film 10 and 20 of the present invention includes a base film 11 made of a polymer material and a low refractive hard coat layer 11 having anti- (FIG. 1B) in which the low refractive index hard coat layers 22 and 23 having anti-stain performance are formed on both sides of the base film 21, or in the form of a laminated film (FIG.

At this time, in the low refractive hard coat film 20 according to the present invention, the hard coating layer is formed from a thermosetting resin composition, and the thickness of the coating layer is formed to be 5 占 퐉 or less. The hardness is measured by pencil hardness, , And no speckling occurs even after the reliability test for 102 hours at 85 ° C / 85% -relative humidity condition. Each layer will be described below in order.

1. Base film (11, 21)

In the base films 10 and 20, the base films 11 and 21 may be in the form of a flexible film excellent in mechanical strength, dimensional stability, flatness, heat resistance, chemical resistance, optical characteristics, and the like, . Any film having sufficient mechanical and thermal stability and high visible light transmittance can be used without limitation. In particular, in order to be used as a member for an image display device, the light transmittance at a wavelength of 400 to 800 nm is preferably 70% or more, more preferably 80% or more, and the haze value is preferably 5% Preferably 3% or less.

The base film may typically be a polymeric polymer film such as polycarbonate, polyolefin, polyvinyl resin, or polyester.

Preferably, a synthetic linear polyester film is used, and a polymer film having a high transmittance such as a polyethylene terephthalate (PET) film or a polyethylene naphthalate (PEN) film having both light transmittance and thermal stability is used.

The thickness of the base film is not particularly limited, and a typical thickness is in the range of 5 to 500 mu m, preferably 20 to 250 mu m.

The polymeric polymer film used in the base film may be chemically treated by corona treatment, plasma treatment or the like for the purpose of improving adhesion with a hard coat layer, or the like, thereby improving the surface tension or improving the affinity of the modified polymer , A partially hydrolyzed copolymer, a highly polar primer treatment, or the like, or subjected to roughing treatment, stretching or heat treatment, water repellent treatment for thermal stability, or containing a small amount of fine particles or filler It can be done. On the other hand, the base film may be obtained by bonding two or more films by a known method.

2. Hard coating layers 12, 22 and 23,

In the anti-stain low refractive hard coat film according to the present invention, the hard coat layer formed on the base film is formed for the purpose of imparting adhesion and anti-stain property to the base film.

2.1. Silicone acrylate hybrid resin composition

In the present invention, the anti-smudge layer is formed by curing the thermosetting resin composition.

In one embodiment of the present invention, the thermosetting resin composition comprises a silicone acrylate hybrid resin.

The silicone acrylate hybrid resin used in the present invention is a compound having a silicone-based reactive functional group and a (meth) acryloxy functional group represented by the following formula (1)

[Chemical Formula 1]

X is a molecular chain having a (meth) acryloxy functional group as a reactive group, R ₁ and R ₂ are selected from hydrogen, a C _{1 to} C ₆ alkyl group or a C _{1 to} C ₆ alkoxy group, R ₃ is hydrogen or a C _{1 to} C ₆ alkyl group, and Y is an integer of 1 to 2500.

The compound represented by the formula (1) may be a monomer or a polymer. Preferred examples of the monomer having a silicone-based reactive functional group and a (meth) acryloxy functional group include 3-acryloxypropyltrimethoxysilane, methacryloxypropyltrimethoxysilane, methacryloxymethyltriethoxysilane, methacryloxymethyltri Methacryloxypropylmethyldimethoxysilane, methacryloxypropylmethyldimethoxysilane, methacryloxypropylmethyldimethoxysilane, methacryloxypropylmethyldimethoxysilane, methacryloxypropylmethyldimethoxysilane, methacryloxypropylmethyldimethoxysilane, methacryloxypropylmethyldimethoxysilane, methacryloxypropylmethyldimethoxysilane, Vinyltrimethoxysilane, aryltrimethoxysilane, vinyltriethoxysilane, and vinyltrimethoxysilane. These may be used alone or in combination of two or more.

Preferable examples of the resin having a silicone-based reactive functional group and a (meth) acryloxy functional group include polydimethylsiloxane having an acryloxy end, branched polydimethylsiloxane having a methacryloxypropyl end, and the like.

The above-mentioned silicone acrylate hybrid resin may be used alone or in combination with a transparent acrylic resin. The transparent acrylic resin is an acrylic resin obtained by polymerizing a monomer derived from (meth) acrylic acid containing an alkyl (meth) acrylate monomer and / or a polar functional group (for example, a hydroxyl group, an amino group, a carboxyl group, a heterocyclic group, to be.

Preferred examples of the alkyl (meth) acrylate include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, Acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (Meth) acrylate, isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, glycidyl (meth) acrylate, behenyl Methacrylate, ethoxymethyl (meth) acrylate, and the like.

On the other hand, as the polar functional group-containing monomer, the hydroxyl group-containing monomer includes, for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, (Meth) acrylate, diethyleneglycol mono (meth) acrylate, hydroxybutyl (meth) acrylate, and the like, monomers containing an amino group such as dimethylaminoethyl For example, acrylic acid, methacrylic acid, and? -Carboxyethyl acrylate.

The monomers may be used in combination of two or more, polymerized in the form of a polymer, mixed in the form of a monomer in the form of a polymer polymerized in the form of a polymer, or may be used as long as the acrylic resin has transparency that does not impair the visibility of the display Can be selected and used.

Further, for the purpose of improving the hardness and durability of the hard coating layer, a multifunctional crosslinking agent may be further added to the thermosetting resin composition. Preferable examples of the polyfunctional crosslinking agent include bifunctional acrylic monomers such as hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate and diethylene glycol diacrylate, pentaerythritol triacrylate, di And polyfunctional acrylic monomers such as pentaerythritol hexaacrylate and trimethyl propane triacrylate. These may be used alone or in combination of two or more.

In another embodiment of the present invention, a fluorine-modified acrylic resin may be added to the thermosetting resin composition in the low refractive hard coat layer. The fluorine-modified acrylic resin refers to a resin containing a fluoroalkyl (meth) acrylate represented by the following general formula (2).

(2)

Wherein R ₁ is a hydrogen atom or a methyl group, R _x is a hydrocarbon group having 1 to 10 carbon atoms, and R _f is a fluoroalkyl group having 3 to 17 fluorine atoms.

In the fluoroalkyl (meth) acrylate represented by the general formula (2), the number of fluorine atoms of R _f is preferably 3 or more for the purpose of preventing stains.

In the fluoroalkyl (meth) acrylate represented by the general formula (2), R _x is a hydrocarbon group having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms. Specific examples thereof include saturated hydrocarbon groups such as methylene, ethylene, propylene, butylene, pentylene and hexylene groups, and ethylene groups are particularly preferred.

In the fluoroalkyl (meth) acrylate represented by the general formula (2), the number of fluorine atoms of the fluoroalkyl group is preferably 3 to 17. [ When the number of fluorine atoms of the fluoroalkyl group is 3 or more, the stain-preventing performance can be manifested. When the number of fluorine atoms of the fluoroalkyl group is more than 17, there is a problem that the solubility in the crude solution is poor and it is difficult to form a uniform coating film.

The fluoroalkyl (meth) acrylate is copolymerized with a structural unit derived from conventional alkyl (meth) acrylate to form a fluoroalkyl (meth) acrylate-based polymer. The alkyl (meth) acrylate is a (meth) acrylate having as a substituent a linear, branched or cyclic alkyl group having from 1 to 18 carbon atoms, such as methyl (meth) acrylate, ethyl (meth) (Meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (Meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate and benzyl (meth) acrylate. These may be used alone or in combination of two or more.

The content of the fluoroalkyl (meth) acrylate structural unit represented by the general formula (2) contained in the fluorine-modified acrylic resin is preferably 0.5 to 50 mol%, and in the above content, the fluoroalkyl (meth) Is less than 0.5 mol%, it is not suitable for realizing the desired anti-stain property. If it exceeds 50 mol%, film formation becomes difficult.

On the other hand, the fluoroalkyl (meth) acrylate polymer (A) may contain a monomer having a functional group unit in the polymer chain in a range of 0.1 to 20 mol%, and the functional group constituent unit However, preferably any one functional group selected from the group consisting of hydroxyl group, amino group and carboxyl group reacts with the crosslinking agent as a crosslinking reaction site to form a crosslinking point. Monomers having a hydroxyl group include, for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, chloro-2- hydroxypropyl (meth) acrylate, diethylene glycol mono ) Acrylate. Monomers having an amino group are, for example, dimethylaminoethyl (meth) acrylate and the like. On the other hand, monomers containing a carboxyl group such as acrylic acid, methacrylic acid,? -Carboxyethyl acrylate and the like. These may be used alone or in combination of two or more.

The fluorine-modified acrylic resin is preferably contained in an amount of 30 parts by weight or less, more preferably 25 parts by weight or less, based on 100 parts by weight of the silicone acrylate hybrid resin. When it exceeds 30 parts by weight, the coating solution prepared therefrom becomes poor in coating property. On the other hand, although there is no lower limit with respect to the content of the fluorine-modified acrylic resin, according to the inventors' repeated experiments, it was confirmed that the addition of the fluorine-modified acrylic resin should prevent the stain by 5 wt% or more.

In another embodiment according to the present invention, the thermosetting resin composition may further contain inorganic particles having a low refractive index for the purpose of improving light transmittance. The inorganic fine particles to be used for the above purpose include, for example, alumina, silica and the like, and it is most preferable to use silica having an average particle size of 1 to 100 nm, among which hollow silica is most preferably used.

When the inorganic fine particles are used, the content thereof is preferably 50 parts by weight or less, more preferably 30 parts by weight or less, based on 100 parts by weight of the silicone acrylate hybrid resin. When the amount is more than 50 parts by weight, the light transmission effect is improved in the case of use, but the possibility of occurrence of stain after reliability evaluation is increased. On the other hand, the lower limit of the inorganic fine particles is not particularly limited, but it is preferable to use at least 5 parts by weight from the viewpoint of balance between the light transmittance and the anti-smudge effect.

The thermosetting resin composition may contain an initiator for the purpose of thermosetting the composition. The initiator is a radical initiator, for example, a peroxide or azo initiator. Examples of the peroxide include tert-butyl peroxide, t-butyl perbenzoate, dibenzyl peroxide, methyl ethyl ketone peroxide, diacetyl peroxide, t-butyl hydroperoxide, ditertiary butyl peroxide, Dicumyl peroxide, dicumyl peroxide and similar free radical peroxide initiators. The azo-based initiator may be, for example, comprising AIBN and a similar azo free radical initiator. Preferably, AIBN is used. The initiator is used in an amount of 0.1-5 parts by weight based on 100 parts by weight of the silicone acrylate hybrid resin.

2.2. Formation of low refractive hard coat layer

The above-mentioned thermosetting resin composition is diluted with an appropriate solvent and prepared as a coating solution, and then coated and cured on a base film to form a primer coating layer.

Examples of the organic solvent capable of diluting (dissolving and / or dispersing) the resin composition include ketones such as acetone, methyl ethyl ketone and cyclohexanone, alcohols such as methanol, ethanol, propanol and benzyl alcohol, , And an ester system. Some examples of the solvent include cyclohexanone, methyl ethyl ketone, benzyl alcohol, diethylene glycol alkyl ether, phenoxy propanol, propylene glycol methyl ether acetate, tetrahydrofuran, N-methylpyrrolidone, etc. Or a mixture of two or more of them may be used.

The solid content in the coating liquid is preferably 1 to 30% by weight, more preferably 10 to 20% by weight. If the content of the solid content is less than 1% by weight, the thickness of the coating layer may be uneven and the hardness may be lowered. On the other hand, when the content of the solid content exceeds 30% by weight, It can not be completely accomplished, which may cause problems such as hardness and solvent resistance.

In addition to the above-mentioned compositions including the silicone acrylate resin, other additives such as a resin, an ultraviolet absorber, a defoaming agent, and a dispersant may be added to the coating liquid within the range of not adversely affecting adhesion, durability and optical characteristics.

The coating liquid is applied on the base film according to a known method such as bar coating, gravure coating, microgravure coating, knife coating, roll coating, spin coating and the like. On the other hand, the coating may be formed by an offline coating or an inline coating method depending on the timing.

The application of the coating liquid is performed on the base film at a coating amount of 0.01 to 50 g / m ² to form a primer layer. At this time, if the coating amount of the primer solution is less than 0.01 g / m ² , the hardness and anti-stain property deteriorate. If it exceeds 50 g / m ² , The inside of the primer layer is hardly cured and the problem of low chemical resistance occurs.

On the other hand, the post-application curing is carried out according to the usual thermosetting method. For example, heat is applied at a temperature of 100 to 180 DEG C for 5 to 60 seconds by a hot air dryer to cure the coating layer simultaneously with drying. According to the thermosetting method as described above, the curing speed is higher than that of the photocurable resin, and the productivity is improved, which is very advantageous in terms of cost.

In the present invention, the thickness of the primer coating layer after curing is preferably from 0.1 탆 to 5 탆, more preferably from 0.5 탆 to 3 탆. When the thickness is less than 0.1 탆, there may be problems such as unevenness of the coating layer and reduction in hardness, and when it exceeds 5 탆, hardening is difficult with a short heat treatment time.

Hereinafter, the present invention will be described in more detail with reference to Examples. The present invention is intended to more specifically illustrate the present invention, and the scope of the present invention is not limited by these examples.

Example 1

Base film: A polyethylene terephthalate film having a thickness of 100 占 퐉 was used (XU46H, Toray Hi-tech Co., Ltd.).

Thermosetting Resin Composition: In preparing a coating solution containing a silicone acrylate resin composition, a primer coating solution having a solid content of 4% by weight was prepared using a solvent MEK having a solid content of silicone acrylate resin (Dow Corning, FA 4001) Respectively.

Preparation of Low Refractive Hard Coat Film: The coating liquid was coated on one side of the base film by microgravure coating method and then cured by heating at 150 DEG C for 1 minute to form a low refractive hard coat layer having a 3 mu m anti-smudge property A hard coat film was produced.

Example 2

The coating layer was formed in the same manner as in Example 1, except that the thickness of the coating layer was 1 mu m.

Example 3

Except that 20 parts by weight of fluorine-modified acrylate (BASF, EFKA 占 3777) was added to 100 parts by weight of silicone acrylate in the coating solution.

Example 4

Except that 20 parts by weight of fluorine-modified acrylate (BASF) and 30 parts by weight of silicone particles (Japan catalysed property / ELCOME) were added to the coating solution for 100 parts by weight of silicone acrylate.

Comparative Example 1

An epoxy acryl hybrid resin (solid content: 30%) (HC-410 manufactured by Jusung Chem Co., Ltd.) was coated on the same base film as in Example 1 using a micro gravure coater to cure the applied layer at 150 캜 for 4 minutes, A hard coat film was prepared by forming a coating layer of about 3 탆.

Comparative Example 2

Was prepared in the same manner as in Comparative Example 1, except that the curing time was reduced to 1 minute.

Comparative Example 3

The coating layer was formed in the same manner as in Comparative Example 1, except that the thickness of the coating layer was 1 mu m.

Comparative Example 4

Except that polyurethane acrylate hybrid resin (solid content 25%) (NPC-3601 manufactured by NANUX Co., Ltd.) was used.

Comparative Example 5

Except that an acrylic resin (solid content: 38%) (SC-3100, manufactured by SUNG CHANG TECH CO., LTD.) Was used.

Comparative Example 6

Except that the thickness of the coating layer was changed to 1 mu m.

Comparative Example 7

A coating layer having a thickness of about 3 占 퐉 was formed by curing a hybrid resin (solid content 15%) (Sankyo kasei, SOR-9) of amino resin, modified epoxy resin and modified polyepoxy resin at 130 ° C for 1 minute .

Comparative Example 8

In Comparative Example 7, a coating layer was prepared by changing the thickness of the coating layer to 1 占 퐉 and the curing condition to 150 占 폚 for 1 minute.

Comparative Example 9

An antireflection film of Panasonic Co., in which a hard coating layer using an acrylate resin on polyethylene terephthalate and a low refractive layer comprising silica particles were sequentially formed, was evaluated using a control group.

evaluation

1. Pencil Hardness

The pencil hardness was measured according to JIS K5400. The pencil was tilted at an angle of 45 ° to the coated surface and scratched at least 5 times with a weight of 1 kg being placed on it to check whether the coating was free of stains and then the hardness was indicated by the pencil grade before the stain was prevented.

2. Solvent resistance

After curing, the solvent (MEK) was dropped on the coated surface and left for 1 minute. The solvent was then wiped off and the coated side was observed. When the coating surface was opaque and the coating layer was scratched, it was judged to be uncured. `X` when not cured, and` ○ `when cured.

3. Transmission

The total light transmittance and haze were measured using a spectrophotometer (NDH 5000 equipment model using NIPPON DENSHOKU INDUSTRIES CO., LTD.).

4. Stain test

The samples that satisfied the solvent resistance, permeability and pencil hardness characteristics were subjected to a stain test. The Erlul test confirmed the occurrence of the stain. After placing the sample in the oven, DI water was dripped onto the sample surface and reliability testing was conducted for 720 hours at 85 ° C / 85% relative humidity. After that, the surface of the sample is checked for stains and wiped off with a normal soft cloth. If there is no stain, it is marked with `○`. If the stain remains finally, it is marked with `X`.

The pencil hardness, solvent resistance, permeability and adhesion force measurements were measured at least five different points to improve reliability.

Coating Thickness (um) Solvent resistance Pencil hardness Permeability Stain TEST Example 1 3 ○ H 93.07 ○ Example 2 One ○ H 93.05 ○ Example 3 One ○ H 93.13 ○ Example 4 One ○ H 93.34 ○ Comparative Example 1 3 ○ F 92.52 Comparative Example 2 3 X - - Comparative Example 3 One ○ F 92.48 Comparative Example 4 3 ○ F 92.54 Comparative Example 5 3 ○ F 92.43 Comparative Example 6 One ○ F 92.12 Comparative Example 7 3 ○ H 91.81 Comparative Example 8 One ○ F 91.79 Comparative Example 9 - ○ H 94.67 X

When a conventional thermosetting resin is applied to a hard coat layer, a long heat treatment time is required, and the pencil hardness characteristics are degraded when the coating thickness is reduced. Silicone acrylate showed satisfactory hardness and transparency. Fluorine acrylate, which can control the refractive index, was used to increase the permeability in order to improve the permeability. When a small amount of inorganic particles were mixed, the permeability In addition, it was confirmed that unevenness did not occur even after the reliability test.

10.20 .. low refractive hard coat film
11. 21. Base film
12, 22, 23. The low refractive hard coat layer

Claims (6)

A laminated film comprising a base film made of a polymer material and a low refractive hard coat layer formed on at least one side of the base film,
Wherein the hard coat layer is formed from a thermosetting resin composition,
The thickness of the coating layer is 5 占 퐉 or less, and when the hardness is measured by pencil hardness measurement,
85 ° C / 85% - low refractive hard coat film with anti-stain performance that does not cause staining even after a reliability test of 720 hours at relative humidity. The low refractive hard coat film according to claim 1, wherein the thermosetting resin composition comprises a silicone acrylate hybrid resin represented by the following chemical formula 1:
[Chemical Formula 1]

X is a molecular chain having a (meth) acryloxy functional group as a reactive group, R ₁ and R ₂ are selected from hydrogen, a C _{1 to} C ₆ alkyl group or a C _{1 to} C ₆ alkoxy group, R ₃ is hydrogen or a C _{1 to} C ₆ alkyl group, and Y is an integer of 1 to 2500. The low refractive hard coat film according to claim 2, wherein the thermosetting resin composition further comprises 30 parts by weight or less of fluorine-modified acrylic resin with respect to 100 parts by weight of the silicone acrylate hybrid resin The low refractive hard coat film according to claim 2, wherein the thermosetting resin composition further comprises inorganic fine particles in an amount of 50 parts by weight or less based on 100 parts by weight of the silicone acrylate hybrid resin. [2] The low refractive hard coat film of claim 1, wherein the hard coating layer is formed by curing the thermosetting resin composition at a temperature of 100-180 [deg.] C for 1 minute or less. The low refractive hard coat film according to claim 1, wherein the refractive index is 1.3 to 1.47.

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