KR20190123601A - Flexible hard coating composite and flexible hard coating film made using the same - Google Patents

Abstract

The present invention relates to a flexible hard coating composition including: an acrylate-based organic binder including a polyfunctional urethane acrylate oligomer, an acrylate monomer and a polyfunctional urethane acrylate compound; a photopolymerization initiator; an organic solvent; additives including a first additive in which metal oxide nanoparticles are dispersed on a dispersion medium. The provided flexible hard coating composition: has excellent hardness and good scratch resistance while having flexibility; prevents a curling phenomenon on the edge of a film during a manufacturing process or use; and is able to form a hard coating film which does not cause a crack by having appropriate flexibility.

Description

Flexible hard coating composition and flexible hard coating film manufactured using the same {Flexible hard coating composite and flexible hard coating film made using the same}

The present invention relates to a composition for flexible hard coating having flexibility and protecting a display surface, and a flexible hard coating film prepared using the same.

Here, background art is provided with respect to the present disclosure, and these do not necessarily mean known art.

In order to improve the protection or aesthetics of the display, such as mobile, touch panel, car navigation, etc., a thin cover window is formed to cover a wider area than the image display part. It is arrange | positioned in the direction.

As a cover window, tempered glass is used. Glass has excellent characteristics in heat resistance, light transmittance, and mechanical strength, but it is heavy and fragile and difficult to apply in flexible display. It is being reviewed in the relevant industry.

In the case of plastic films, however, the mechanical flexibility is much higher than that of the glass substrate, but since the strength and surface hardness are inferior to that of the glass substrate, it may include a hard coating layer. There is a problem of being easily peeled off. In addition, although a fluorine-containing surface treatment agent was used to provide a coating composition with improved stain resistance, the fluorine-containing surface treatment agent has a characteristic of easily removing dust or abrasion resistance due to the occurrence of static electricity during wear or friction.

On the other hand, in recent years, a flexible display device that can maintain display performance even if it is bent like a paper using a flexible material such as plastic instead of a glass substrate without conventional flexibility has emerged as a next-generation display device. There is a need for a hard-coated film having a high c) and a good scratch resistance, not causing curling at the edges of the film during the manufacturing process or use, and having adequate flexibility and no cracking.

1. Korea Patent Registration No. 10-1482707 (2015.01.08.) 2. Korean Patent Publication No. 10-2010-0111671 3. US Patent US8,110,296

The present invention is to provide a composition capable of forming a flexible hard coating film having flexibility and excellent hardness and scratch resistance to solve the above problems.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention is an acrylate organic binder comprising a polyfunctional urethane acrylate oligomer, an acrylate monomer and a polyfunctional urethane acrylate compound; Photopolymerization initiator; Organic solvents; And an additive comprising a first additive in which metal oxide nanoparticles are dispersed on a dispersion medium.

According to the present invention, the composition of the present invention not only has excellent hardness and good scratch resistance, but also does not cause curl at the edge of the film during the manufacturing process or use, and does not generate cracks due to proper flexibility. It is possible to provide a flexible hard coating composition capable of forming a hard coating film.

By using the flexible hard coating composition according to the present invention can be formed a single layer of a flexible hard coating film, it is also possible to form a flexible hard coating film by coating the flexible hard coating composition according to the invention on a separate substrate layer have.

Prior to describing the present invention in detail below, it is understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention, which is limited only by the scope of the appended claims. shall. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise indicated.

Throughout this specification and claims, unless otherwise indicated, the termcomprise, constitutes, and configure means to include the referenced article, step, or group of articles, and step, and any other article It is not intended to exclude a stage or group of things or groups of stages.

On the other hand, various embodiments of the present invention can be combined with any other embodiment unless clearly indicated to the contrary. Any feature indicated as particularly preferred or advantageous may be combined with any other feature and features indicated as preferred or advantageous. Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention and the effects thereof.

The flexible hard coating composition according to an embodiment of the present invention is a composition capable of forming a film having flexibility and high hardness and excellent scratch resistance, and includes an acrylate-based organic binder, a photopolymerization initiator, an organic solvent, and an additive. .

The acrylate-based organic binder includes a polyfunctional urethane acrylate oligomer, an acrylate monomer, and a polyfunctional urethane acrylate compound.

The multifunctional urethane acrylate oligomer includes a bifunctional or higher urethane acrylate oligomer having 6 to 15 carbon atoms. It is preferable to include a C6-C15 aliphatic urethane acrylate oligomer having 8 to 15 carbon atoms in view of fast curing speed, high hardness, and excellent scratch resistance. Most preferably, aliphatic urethane acrylate is used.

The polyfunctional urethane acrylate oligomer is included in the acrylate-based organic binder 40 to 60wt%, preferably 45 to 55wt%.

The acrylate monomer is trimethylolpropane triacrylate (TMPTA), tripropylene glycol diacrylate (TPGDA), dipentaerythritol hexaacrylate (DPHA), acryloyl mor Acryloyl Morpholine (ACMO), Di-trimethylolpropane triacrylate (DMPTA), Dipentaerythritol pentaacrylate (DEPTA) and Pentaerythritol tetraacrylate (PETA) At least one selected from the group consisting of.

The acrylate monomer is included in the acrylate-based organic binder 15 to 25 wt%, preferably 17 to 22wt%.

The acrylate monomer may include at least two or more selected from the group consisting of, wherein trimethylolpropane triacrylate (TMPTA), tripropylene glycol diacrylate (TPGDA) At least one selected from a first acrylate monomer composed of dipentaerythritol hexaacrylate (DHA) and acryloyl morpholine (ACMO) and di-trimethylolol propane (Di any one or more selected from second acrylate monomers consisting of -trimethylolpropane triacrylate (DMPTA), dipentaerythritol pentaacrylate (DEPTA) and pentaerythritol tetraacrylate (PETA); Good to do.

When the acrylate monomer includes at least two or more selected from the group consisting of, the first acrylate monomer and the second acrylate monomer may be included in a weight ratio of 2: 1 to 4: 1.

The multifunctional urethane acrylate compound has a weight average molecular weight of 5,000 or more and includes a bifunctional or more urethane acrylate compound. Preferably, the weight average molecular weight is 10,000 to 30,000, and it is preferable to include a 6 to 15 functional urethane acrylate compound in view of fast curing speed, high hardness, and excellent scratch resistance. Most preferably, it is preferable to use Aliphatic Urethane Hexaacrylate.

The polyfunctional urethane acrylate compound is included in the acrylate-based organic binder 15 to 35wt%, preferably 20 to 30wt%.

The photopolymerization initiator includes an acetophenone-based compound. The acetophenone-based compound is 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 4- (2-hydroxyethoxy) -phenyl (2-hydroxy) propyl ketone, 1-hydroxycyclohexylphenyl keton, 2,2-dimethoxy-2-phenyl acetophenone, 2 -Methyl- (4-methylthiophenyl) -2-morpholino-1-propan-1-one (Irgacure-907), 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl)- It contains at least one or more selected from the group consisting of butan-1-one.

The photopolymerization initiator may be included in an amount of 5 to 15 parts by weight based on 100 parts by weight of the acrylate-based organic binder, and preferably 7 to 10 parts by weight.

The organic solvent is methyl ethyl ketone, ethyl acetate, ethyl hexane, cyclohexane, methyl isobutyl ketone, isopropyl alcohol, polypropylene glycol, polypropylene Polypropylene glycol methyl ether acetate, methoxytriglycol, ethoxytriglycol, butoxytriglycol, 1-butoxyethoxy-2-propanol (1-butoxyethoxy -2-propanol) and at least one selected from the group consisting of phenyl glycol ethers.

It is preferable to use a mixed solvent including at least two or more selected from the group consisting of the organic solvent, wherein methyl ethyl ketone, ethyl acetate, cyclohexane, methyl At least one selected from the first solvent consisting of isobutyl ketone and isopropyl alcohol, and polypropylene glycol, polypropylene glycol methyl ether acetate , Methoxytriglycol, ethoxytriglycol, butoxytriglycol, 1-butoxyethoxy-2-propanol and phenyl glycol ether It is preferable to include any one or more selected from the second solvent consisting of glycol ether).

When the organic solvent includes at least two or more selected from the group consisting of the above, it is preferable to include the first solvent and the second solvent in a weight ratio of 1: 3 to 1: 1.

The organic solvent may be included in an amount of 90 to 120 parts by weight, preferably 100 to 115 parts by weight, based on 100 parts by weight of the acrylate-based organic binder.

The additive may include a first additive in which metal oxide nanoparticles are dispersed on a dispersion medium, and may further include a second additive that is a fluorine compound.

More specifically, the first additive is a solution in which the metal oxide nanoparticles having a D50 of 10 to 50 nm are dispersed at 20 to 40 wt% in a dispersion medium which is an acrylate compound or an acetate compound.

The metal oxide nanoparticles include any one or more selected from the group consisting of oxides of aluminum, silicon, tin, zirconium, titanium, silver and zinc, and preferably include aluminum oxide and / or silicon oxide. good.

In addition, the metal oxide nanoparticles may be hydrophobized metal oxide nanoparticles by surface treatment with a silane compound. The said silane compound is acryloxyalkyl trimethoxysilane, methacrylicoxyalkyl trimethoxysilane, methacrylicoxyalkyl triethoxysilane, methacrylicoxyalkyl trichlorosilane, (gamma)-methacryloxypropyl trimethoxysilane, (gamma) -Methacryloxypropyl methyldimethoxysilane, (gamma) -methacryloxypropyl methyldiisohydroxysilane, acryloxypropyl trimethoxysilane, acryloxypropyl methyldimethoxysilane, (gamma) -methacryloxycarbitol trimethoxysilane, Phenyl trichlorosilane, phenyl trimethoxysilane, phenyl triethoxysilane, propyl trimethoxysilane, propyl triethoxysilane, glycidoxyalkyl trimethoxysilane, glycidoxyalkyl triethoxysilane, glycidoxy Alkyl trichlorosilane, melamine trimethoxy silane, acrylic trimethoxy silane, perfluoroalkyl trialkoxysilane, perfluorometh At least one selected from the group consisting of butyl alkyl trialkoxysilane and perfluoroalkyl trichlorosilane.

The acrylate compound may include butanediol diacrylate (BDDA), butylene glycol dimethacrylate (BGDMA), hexanediol diacrylate (HDDA), and dimethacrylate (Dimethacrylate). : HDDMA), Neopentyl Glycol Diacrylate: Neopentyl Glycol Diacrylate (NPGDA), Ethylene Glycol Dimethacrylate (EGDMA), Diethylene Glycol Diacrylate (DEGDA), Diethylene Glycol Diacrylate Diethylene Glycol Diacrylate Dimethacrylate (DEGDMA), Triethylene Glycol Diacrylate (TEGDA), Triethylene Glycol Diacrylate Dimethacrylate (TEGDMA), Tetraethylene Glycol Diacrylate (Tetraethylene Glycol Diacrylate: TTEGDA), Tetraethylene Glycol Diacrylate Dimethacrylate (TTEGDMA), Polyethylene Glycol Diacrylate (PEGDA), Polyethylene Glycol Diacrylate Dimethacrylate (PEGDMA), Dipropylene Glycol Diacrylate (DPGDA), Tripropylene Glycol Diacrylate (TPGDA), Allyl Methacrylate (ALMA), Trimethylolpropane Triacrylate (TMPTA) , Trimethacrylate (TMPTMA), pentaerythritol Triacrylate (PETA), ethoxylate propoxylated Trimethylolpropane Triacrylate (TMPEOTA) and glyceryl propoxylated Triacrylate: including at least one or more selected from the group consisting of (Gylceryl PropoxylatedTriacrylate GPTA), and preferably tripropylene glycol diacrylate: good to include (Tripropylene Glycol Diacrylate TPGDA).

The acetate-based compound is methoxy propylacetate, propylene glycol monomethyl ether acetate, diethylene glycol monoethyletheracetate, propylene glycol monomethylether acetate acetate), propylene glycol monoethylether acetate, ethylacetate, 2- (2-ethoxyethoxy) ethyl acetate, methyl acetate It includes at least one selected from the group consisting of (methylacetate) and butyl acetate (butyl acetate), preferably containing methoxy propylacetate (Methoxypropylacetate).

The first additive is included in 1 to 25 parts by weight, preferably 2 to 12 parts by weight based on 100 parts by weight of the acrylate-based organic binder.

More specifically, the second additive is an acrylic compound containing fluorine. The fluorine-containing acrylic compound includes perfluoroalkyl acrylates, perfluoroalkyl ethyl acrylates (TEAc), perfluoroalkylethyl methacrylates (TEMAc), and 2 And at least one selected from the group consisting of 2-trifluoroethyl methacrylate. It is preferable to include perfluoroalkyl acrylates.

The second additive is included in an amount of 0.1 to 5 parts by weight, preferably 1 to 3 parts by weight, based on 100 parts by weight of the acrylate-based organic binder.

The flexible hard coating composition may be used to form a single-layer flexible hard coating film, and the flexible hard coating composition may be coated on a separate substrate layer to form a flexible hard coating film. In this case, the substrate layer is polyethylene terephthalate (PET), polymethylmethacrylate (PMMA), polycarbonate (PC), polystyrene (PS), polyimide (Polyimide, PI), polyphenyl A layer formed of at least one selected from the group consisting of phenylsulfide (PPS), polyethylenenaphthalate (PEN), polyethersulfone (PES), and allyl resin may be used. Preferably, it is preferably a high-strength base layer formed of a compound including a compound containing a structure having reactivity with an alkoxysilane group.

Examples of the compound having a structure reactive with an alkoxysilane group include an acrylic photocurable resin including an organosilicon compound containing a cubic structure [R ₃ SiO _3/2 ] _p . have.

Each R ₃ is independently hydrogen; heavy hydrogen; halogen; Amine group; Epoxy groups; Cyclohexyl epoxy group; (Meth) acryl group; Siol group; Isocyanate group; Nitrile group; Nitro group; Phenyl group; C ₁ -C ₄₀ alkyl group which is unsubstituted or substituted with deuterium, halogen, amine group, epoxy group, (meth) acryl group, siol group, isocyanate group, nitrile group, nitro group, or phenyl group; C ₂ -C ₄₀ alkenyl group; C ₁ ~ C ₄₀ Alkoxy group; C ₃ -C ₄₀ cycloalkyl group; C ₃ ~ C ₄₀ Heterocycloalkyl group; C ₆ -C ₄₀ aryl group; C ₃ ~ C ₄₀ heteroaryl group; An aralkyl group of C ₃ ~ C _40; C ₃ -C ₄₀ aryloxy group; Or a C ₃ to C ₄₀ arylcyol group, wherein p is 6, 8, 10, or 12.

The organosilicon compound may be a C ₁ ~ C ₄₀ alkyl group wherein at least one or more of R ₅ independently of each other is substituted with a (meth) acryl group or a (meth) acryl group; C ₂ -C ₄₀ alkenyl group; C ₁ ~ C ₄₀ Alkoxy group; C ₃ -C ₄₀ cycloalkyl group; C ₃ ~ C ₄₀ Heterocycloalkyl group; C ₆ -C ₄₀ aryl group; C ₃ ~ C ₄₀ heteroaryl group; An aralkyl group of C ₃ ~ C _40; C ₃ -C ₄₀ aryloxy group; Or a C ₃ to C ₄₀ arylcyol group.

Example

(1) Example 1

First, 49.64 g of a mixed organic solvent was prepared by mixing 19.77 g of methyl isobutyl ketone and 29.87 g of polypropylene glycol methyl ether acetate.

21.6 g of aliphatic urethane acrylate in the prepared organic solvent 49.64 g, 9.12 g of dipentaerythritol hexaacrylate, 3.03 g of pentaerythritol tetraacrylate, ali 11.25 g of Aliphatic Urethane Hexaacrylate, 4.16 g of 1-hydroxycyclohexylphenyl keton, 0.8 g of Perfluoroalkyl acrylates and 0.4 g of BYK 371 ( Slip agent) was added and mixed to prepare 100 g of the first composition.

100 g of the first composition prepared above was mixed with Tripropylene Glycol Diacrylate and 11.1 g of a solution in which an aluminum oxide nanoparticle having a D50 of 40 nm was dispersed at 30 wt%, thereby preparing a flexible hard coating composition. 21.1 g of the composition was prepared.

(2) Example 2

Flexible hard by mixing 11.1 g of a solution in which D50 is 20 nm and surface hydrophobized aluminum oxide nanoparticles dispersed at 30 wt% in 100 g of the first composition prepared in Example 1 is mixed with 20 nm of methoxy propylacetate. 111.1 g of a second composition, a coating composition, were prepared.

(3) Example 3

Flexible hard by mixing 1.0 g of a solution in which 30 wt% of aluminum oxide nanoparticles having a D50 of 40 nm was mixed with tripropylene glycol diacrylate in 100 g of the first composition prepared in Example 1. 101.01 g of the second composition, a coating composition, was prepared.

(4) Example 4

100 g of the first composition prepared in Example 1 was mixed with Tripropylene Glycol Diacrylate and 3.09 g of a solution in which 30 wt% of aluminum oxide nanoparticles having a D50 of 40 nm was dispersed at 30 wt%. 103.09 g of the second composition, a coating composition, was prepared.

(5) Example 5

100 g of the first composition prepared in Example 1 was mixed with Tripropylene Glycol Diacrylate and 5.26 g of a solution in which an aluminum oxide nanoparticle having a D50 of 40 nm was dispersed at 30 wt% was mixed. 105.26 g of the second composition, a coating composition, was prepared.

(6) Comparative Example

100 g of the first composition prepared in Example 1 was used as a flexible hard coating composition as a comparative example.

Production Example

The flexible hard coating composition prepared in the above embodiment was flow coated on a transparent polyimide (PI) substrate layer having a thickness of 30 μm and 60 μm, dried at 60 ° C. for 5 minutes, and irradiated with ultraviolet light at a light quantity of 1000 mJ to 4 to thickness. A 6 μm flexible hard coat film was prepared in a combination as shown in Table 1 below.

Composition Substrate layer
Thickness (μm) Hard coating film
Thickness (μm) Comparative Production Example Comparative example 30 5 Preparation Example 1 Example 1 30 5 Preparation Example 2 Example 2 30 4 ~ 5 Preparation Example 3 Example 3 30 4 ~ 6 Preparation Example 4 Example 3 60 4 ~ 6 Preparation Example 5 Example 4 30 5 Preparation Example 6 Example 5 30 5

Experimental Example

(1) hardness measurement

The pencil hardness against the load of 1kg was measured by the PET standard method (pencil hardness measurement method) using a pencil hardness tester for the film prepared according to the above production example. Pencil hardness measurement results are shown in Table 2 below.

(2) Scratch resistance and wear resistance measurement

The scratch resistance was evaluated by measuring the number of times the scratch occurred on the surface of the film produced according to the preparation example when reciprocating at 1.5kg load using steel wool. The scratch resistance measurement results are shown in Table 2 below.

compare
Production Example Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 4 Preparation Example 5 Preparation Example 6 Pencil hardness 2H ~ 4H 3H 2H 2H 3H 3H 3H 2H Scratch resistance Visually
Test 500 1500 1500 7000 1000 7000 7000

Features, structures, effects, and the like illustrated in the above-described embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

Claims (13)

An acrylate organic binder comprising a polyfunctional urethane acrylate oligomer, an acrylate monomer and a polyfunctional urethane acrylate compound;
Photopolymerization initiator;
Organic solvents; And
Flexible hard coating composition comprising a; metal oxide nanoparticles comprising an additive comprising a first additive dispersed on a dispersion medium.
The method of claim 1,
The first additive is a flexible hard coating composition, characterized in that the metal oxide nanoparticles having a D50 of 10 to 50 nm dispersed in 20 to 40 wt% in a dispersion medium that is an acrylate compound or an acetate compound.
The method of claim 1,
The metal oxide nanoparticles flexible hard coating composition comprising any one or more selected from the group consisting of oxides of aluminum, silicon, tin, zirconium, titanium, silver and zinc.
The method of claim 1,
The metal oxide nanoparticles are flexible hard coating compositions, characterized in that the surface treatment with a silane compound hydrophobized metal oxide nanoparticles.
The method of claim 2,
The acrylate compound may include butanediol diacrylate (BDDA), butylene glycol dimethacrylate (BGDMA), hexanediol diacrylate (HDDA), and dimethacrylate (Dimethacrylate). : HDDMA), Neopentyl Glycol Diacrylate: Neopentyl Glycol Diacrylate (NPGDA), Ethylene Glycol Dimethacrylate (EGDMA), Diethylene Glycol Diacrylate (DEGDA), Diethylene Glycol Diacrylate Diethylene Glycol Diacrylate Dimethacrylate (DEGDMA), Triethylene Glycol Diacrylate (TEGDA), Triethylene Glycol Diacrylate Dimethacrylate (TEGDMA), Tetraethylene Glycol Diacrylate (Tetraethylene Glycol Diacrylate: TTEGDA), Tetraethylene Glycol Diacrylate Dimethacrylate (TTEGDMA), Polyethylene Glycol Diacrylate (PEGDA), Polyethylene Glycol Diacrylate Dimethacrylate (PEGDMA), Dipropylene Glycol Diacrylate (DPGDA), Tripropylene Glycol Diacrylate (TPGDA), Allyl Methacrylate (ALMA), Trimethylolpropane Triacrylate (TMPTA) , Trimethacrylate (TMPTMA), pentaerythritol Triacrylate (PETA), ethoxylate propoxylated Trimethylolpropane Triacrylate (TMPEOTA) and glyceryl propoxylated Triacrylate (Gylceryl PropoxylatedTriacrylate: GPTA) flexible characterized in that it comprises at least one or more selected from the group consisting of a hard coating composition.
The method of claim 2,
The acetate compound may be methoxy propylacetate, propylene glycol monomethyl ether acetate, diethylene glycol monoethyletheracetate, propylene glycol monomethylether acetate acetate), propylene glycol monoethylether acetate, ethylacetate, 2- (2-ethoxyethoxy) ethyl acetate, methyl acetate Flexible hard coating composition comprising at least one selected from the group consisting of (methylacetate) and butyl acetate.
The method of claim 1,
The first additive is a flexible hard coating composition comprising 1 to 25 parts by weight based on 100 parts by weight of the acrylate-based organic binder.
The method of claim 1,
The polyfunctional urethane acrylate oligomer is included in the acrylate-based organic binder at 40 to 60wt%,
The acrylate monomer is included in 15 to 25 wt% in the acrylate-based organic binder,
The polyfunctional urethane acrylate compound is a flexible hard coating composition, characterized in that contained in 15 to 35wt% in the acrylate-based organic binder.
The method of claim 1,
The photopolymerization initiator includes an acetophenone-based compound, the flexible hard coating composition, characterized in that included in 5 to 15 parts by weight based on 100 parts by weight of the acrylate-based organic binder.
The method of claim 1,
The organic solvent is methyl ethyl ketone, ethyl acetate, ethyl hexane, cyclohexane, methyl isobutyl ketone (MIBK), isopropyl alcohol (isopropylalcohol), polypropylene glycol, Polypropylene glycol methyl ether acetate (PMA), methoxytriglycol, ethoxytriglycol, butoxytriglycol, 1-butoxyethoxy-2-propanol (1-butoxyethoxy-2-propanol) and at least one selected from the group consisting of phenyl glycol ether, and includes 90 to 120 parts by weight based on 100 parts by weight of the acrylate-based organic binder Flexible hard coating composition, characterized in that.
The method of claim 1,
The organic solvent is selected from a first solvent consisting of methyl ethyl ketone, ethyl acetate, cyclohexane, methyl isobutyl ketone (MIBK), and isopropyl alcohol (isopropylalcohol). Any one or more of polypropylene glycol, polypropylene glycol methyl ether acetate (PMA), methoxytriglycol, ethoxytriglycol, butoxytriglycol ( butoxytriglycol), 1-butoxyethoxy-2-propanol (1-butoxyethoxy-2-propanol) and phenyl glycol ether (mixture including any one or more selected from a second solvent selected from (phenyl glycol ether) Solvent,
The mixed solvent is a flexible hard coating composition comprising the first solvent and the second solvent in a weight ratio of 1: 3 to 1: 1.
The method of claim 1,
The flexible hard coating composition further includes a second additive which is a fluorine compound,
The second additive is a flexible hard coating composition comprising 0.1 to 5 parts by weight based on 100 parts by weight of the acrylate-based organic binder.
A flexible hard coat film formed using the flexible hard coat composition of any one of claims 1 to 12.