KR20190068494A - Photocurable resin composition and fabrication method of window member using the same - Google Patents

Abstract

A photocurable resin composition of the present invention comprises a (meth)acrylic resin, an urethane acrylate oligomer, a photopolymerizable monomer, and a photopolymerization initiator. Therefore, under conditions of further ultraviolet irradiation, high temperature and high humidity, and thermal shock, there is no occurrence of deterioration of physical properties such as crack generation or adhesion reduction and the like.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photocurable resin composition and a method of manufacturing a window member using the same.

The present invention relates to a photo-curable resin composition and a method for manufacturing a window member using the same.

A liquid crystal display panel, A screen protecting window member for protecting the display panel is provided on a front surface of a display panel such as a plasma display panel or an organic light emitting display panel. Specifically, the window member is attached and fixed to the outer surface of the display panel so that the user can identify the user's input or the output of the device from the outside.

The window member is formed on the outer surface of the device and directly affects the design of the device. Accordingly, an attempt has been made to add various designs to the window member as well as to protect the display panel.

As a method for adding a design to a window member, a method in which a layer imparting an optical function through an ultraviolet ray hardening molding layer and a decoupling film applying a deposition film through an inorganic substance or a metal are applied to a window.

An object of the present invention is to provide a photocurable resin composition capable of forming a resin layer which is improved in adhesion and weatherability and is free from deterioration of properties under conditions of high temperature and high humidity and thermal shock.

It is another object of the present invention to provide a method of manufacturing a window member that does not cause deterioration of physical properties such as cracking or adhering strength under additional ultraviolet irradiation conditions, high temperature and high humidity conditions, and thermal shock conditions that may occur in a further process.

The photocurable resin composition of the present invention comprises 10 to 50 parts by weight of a urethane acrylate oligomer, 400 to 600 parts by weight of a photopolymerizable monomer and 20 to 40 parts by weight of a photopolymerization initiator, based on 100 parts by weight of a (meth) acrylic resin.

The (meth) acrylic resin has a weight average molecular weight of 10,000 to 70,000 and a glass transition temperature of 50 to 90 ° C.

The photopolymerizable monomer may include monofunctional (meth) acrylic monomers, bifunctional (meth) acrylic monomers, and polyfunctional (meth) acrylic monomers. The monomer and the polyfunctional (meth) acrylic monomer may be mixed in a weight ratio of 1: 0.5 to 1.5: 0.2 to 1: 1.

The photopolymerizable monomer may be selected from the group consisting of isoboryl acrylate (IBOA), tetrahydrofuryl acrylate, tetrahydrofurfuryl acrylate acryloyl morpholine, But are not limited to, 2-phenoxyethyl acrylate, tripropyleneglycol diacrylate, polyethyleneglycol diarylate, 1,6-hexane diol diacrylate, At least one selected from the group consisting of trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerytritol hexaacrylate, and the like.

Further, the photo-curing resin composition of the present invention can form a patterned layer of a window member included in a display device.

On the other hand, the method for manufacturing a window member of the present invention includes the steps of preparing a light-transmitting film including a transmissive region through which light is transmitted and a bezel region surrounding the transmissive region; a step of applying a photocurable resin composition on one surface of the transmissive film , Curing the photo-curing resin composition to form a molding layer, and attaching a cover member on the other surface of the translucent film. The photocurable resin composition comprises 10 to 50 parts by weight of a urethane acrylate oligomer, 400 to 600 parts by weight of a photopolymerizable monomer and 20 to 40 parts by weight of a photopolymerization initiator, based on 100 parts by weight of a (meth) acrylic resin copolymerized with an acrylic monomer .

The method of manufacturing a window member according to the present invention includes the steps of forming an evaporation layer by depositing an organic material or an inorganic material so as to overlap the bezel region in a plane on the molding layer after forming the molding layer, And forming a light blocking layer. The method may further include forming an adhesive layer on the molding layer.

The adhesive layer may include an optically clear adhesive film or an optical clear resin.

The adhesive layer may be formed to cover the deposition layer and the light blocking layer.

A pattern may be defined on one side of the molding layer in contact with the deposition layer. The pattern may overlap the bezel region in a plane.

In the step of forming the molding layer, the photocurable resin composition may be ultraviolet cured.

The photopolymerizable monomer may include monofunctional (meth) acrylic monomers, bifunctional (meth) acrylic monomers and polyfunctional (meth) acrylic monomers.

The photocurable resin composition of the present invention can form a pattern layer which is improved in weather resistance and adhesiveness and does not cause deterioration of physical properties such as adhering force even under conditions of additional ultraviolet irradiation, high temperature and high humidity, and thermal shock.

INDUSTRIAL APPLICABILITY The method of manufacturing a window member of the present invention can provide an ultraviolet curable resin pattern layer having improved weatherability and adhesiveness, thereby improving design characteristics and reliability of a product, and securing excellent stability and yield in reworking.

1 is a perspective view of a display device including a window member according to an embodiment of the present invention.
2 is an exploded perspective view of the display device shown in Fig.
3 is a cross-sectional view showing a part of the configuration of the display device shown in Fig.
4 is a cross-sectional view taken along the line II 'in Fig.
5 is a flowchart illustrating a method of manufacturing a window member according to an embodiment of the present invention.
6A to 6E are sectional views sequentially illustrating a method of manufacturing a window member according to an embodiment of the present invention.
FIG. 7A is a photograph of a result of evaluating whether or not a crack occurred in a cured molding layer made of a photo-curable resin composition according to an embodiment of the present invention.
FIG. 7B is a photograph showing the result of evaluating whether or not a crack occurred in the cured molding layer made of the photo-curing resin composition according to the comparative example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification, when it is mentioned that any element (or region, layer, portion, etc.) is "on", "connected", or "coupled" to another element, Or a third component may be disposed therebetween.

Like reference numerals refer to like elements. Also, in the drawings, thickness, ratio, and dimensions of components are exaggerated for an effective description of the technical content. "And / or" include all combinations of one or more of which the associated configurations can define.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The singular expressions include plural expressions unless the context clearly dictates otherwise.

Also, terms such as "below "," below ", "above "," above ", and the like are used to describe the relationship of the configurations shown in the drawings. The terms are described relative to the direction shown in the figure in a relative concept.

It will be understood that terms such as "comprise" or "comprise ", when used in this specification, specify the presence of stated features, integers, , &Quot; an ", " an ", " an "

"(Meth) acrylate" means acrylate and methacrylate, "(meth) acryl" means acryl and methacryl, "(meth) acryloyl" means acryloyl and methacryloyl do.

"Monomer" and "monomer" have the same meaning. The monomer in the present invention is distinguished from an oligomer and a polymer and refers to a compound having a weight average molecular weight of 1,000 or less. In the present specification, the term "polymerizable functional group" refers to a group involved in the polymerization reaction, such as a (meth) acrylate group.

Hereinafter, the photocurable resin composition according to one embodiment of the present invention will be described.

The photocurable resin composition according to one embodiment of the present invention may be one used for forming a pattern layer of a window member included in a display device. The photo-curable resin composition according to one embodiment of the present invention can be used to form a photo-curable resin layer disposed on one surface of a window member for a display device. More specifically, the photocurable resin composition according to one embodiment of the present invention may be applied on one side of a window member and ultraviolet cured to form a pattern layer that provides a specific decoration pattern to the bezel region of the window member .

A photocurable resin composition according to an embodiment of the present invention includes a (meth) acrylic resin, a urethane acrylate oligomer, a photopolymerizable monomer, and a photopolymerization initiator.

In the photocurable resin composition of the present invention, the (meth) acrylic resin controls the crosslinking density of the entire coating film to develop the strength and high-temperature durability of the coating film, and improves the flexibility and adhesiveness and adhesiveness to other materials . The (meth) acrylic resin can be used without limitation in the conventional components known in the art, and can be produced, for example, by a conventional solution polymerization method or suspension polymerization method.

(Meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, (Meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, sec- Acrylate, benzyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, stearyl (meth) acrylate, cyclohexyl Acrylate, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2-butoxyethyl (meth) Acrylate, 2-phenoxyethyl (meth) acrylate, allyl (meth) acrylate, Methacrylate, glycidyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, or may be a mixture of two or more thereof, but is not limited to this.

Vinyl monomers such as acrylamide, acrylonitrile, vinyl acetate, ethylene, propylene, isobutylene, butadiene, isoprene and chloroprene as copolymer components in addition to the (meth) acrylic monomer component in the production of the (meth) acrylic resin. Epoxy group-containing ethylenically unsaturated monomers such as glycidyl (meth) acrylate, methyl glycidyl (meth) acrylate, allyl glycidyl ether and 3,4-epoxycyclohexylmethyl (meth) acrylate; Containing unsaturated monomers such as (meth) acrylic acid, crotonic acid, itaconic acid, maleic acid, and fumaric acid; And hydroxyethyl methacrylate 2-hydroxypropyl methacrylate, and the like, or a mixture of two or more thereof.

The (meth) acrylic resin contained in the photocurable resin composition of the present invention has a weight average molecular weight of 10,000 to 70,000, and a non-reactive (meth) acrylic resin having a glass transition temperature of 50 ° C to 90 ° C desirable. When a resin having a glass transition temperature of less than 50 ° C is applied, the glass transition temperature of the entire cured product is lowered, and scratches or pressing marks during the process may remain at room temperature. When a resin having a glass transition temperature of 90 ° C or higher is applied, the glass transition temperature of the entire cured product is increased, and the hardness is high, but cracks can easily occur. When the weight average molecular weight is less than 10,000, the adhesion is decreased, and when the resin has a weight average molecular weight of more than 70,000, the viscosity of the entire composition is increased, resulting in poor workability, and the precision of optical pattern imprinting It is preferable to use a (meth) acrylic resin within the molecular weight range.

The urethane acrylate oligomer may be an aliphatic urethane acrylate obtained by reacting an aliphatic polyol with a diisocyanate and an acrylate. The urethane acrylate oligomer may have a weight average molecular weight of 5,000 to 15,000. While the (meth) acrylic resin does not cause a reaction upon irradiation with ultraviolet rays, the urethane acrylate oligomer can form a network structure by bonding with other oligomers and photopolymerizable monomers through ultraviolet curing reaction. If the acrylate reacting group of the urethane acrylate oligomer is 3 or more, the crosslinking degree is increased to improve the hardness and mechanical properties of the cured product but lower the adhesive force. Therefore, it is preferable that the acrylate reaction unit has 2 per molecule.

The urethane acrylate may be 10 to 50 parts by weight based on 100 parts by weight of the (meth) acrylic resin. As the content of urethane acrylate falls within the above-mentioned range, the coating film formed through the photocurable resin composition of the present invention can have appropriate hardness and interlaminar bonding strength.

The photopolymerizable monomer may be used as a reactive diluent for the photoreactive polymer to impart workability by controlling the viscosity of the resin composition and may serve as a crosslinking agent for controlling the cross-linking density between the polymers. The photopolymerizable monomer for the coating film formed of the photocurable resin composition according to an embodiment of the present invention is included for the purpose of assisting the curing properties such as hardness, adhesion, scratch resistance and hardness of the coating film.

The photopolymerizable monomer may be a (meth) acrylic monomer. As the (meth) acrylic monomer, known (meth) acrylate monomers containing at least one unsaturated group capable of photopolymerization in the molecule can be used without limitation.

Generally, the (meth) acrylic monomer has a polymerizable functional group contained in one molecule, for example, a monofunctional acrylic monomer (1), a bifunctional acrylic monomer (2), a polyfunctional acrylic monomer (Three or more).

The photocurable resin composition according to the present invention may use the above-described monofunctional, bifunctional and polyfunctional acrylic monomers as photopolymerizable monomers, respectively, or may be used in combination with monofunctional, bifunctional and polyfunctional acrylic monomers in combination .

The monofunctional (meth) acrylic monomer may be, for example, a monomer selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n- butyl (meth) acrylate, isoamyl (meth) acrylate, isomyl (meth) acrylate, n-lauryl (meth) acrylate, isoamyl (Meth) acrylate, n-stearyl (meth) acrylate, isostearyl (meth) acrylate, long chain alkyl (meth) acrylate, n-butoxyethyl (Meth) acrylate such as cyclohexyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, butoxyethyl (meth) acrylate, 2-ethylhexyl- Dicyclopentenyloxyethyl < / RTI > Hydroxyethyl (meth) acrylate, dicyclopentanyl (meth) acrylate, benzyl (meth) acrylate, 2-hydroxyethyl (Meth) acrylate, methoxyethyleneglycol-modified (meth) acrylate, ethoxyethyleneglycol-modified (meth) acrylate, (Meth) acrylate, methoxypropylene glycol modified (meth) acrylate, ethoxypropylene glycol modified (meth) acrylate, propoxypropylene glycol modified (meth) acrylate, tetrahydrofuryl Methacrylate, acryloylmorpholine, and the like.

Examples of monofunctional (meth) acrylates having aromatic rings include phenoxymethyl (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxyethylene glycol modified (meth) acrylate, phenoxypropylene glycol modified (Meth) acrylate, hydroxyphenoxyethyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, hydroxyphenoxyethylene glycol (Meth) acrylate, an alkylphenol-modified (meth) acrylate, an alkylphenol-modified (meth) acrylate, an alkylphenol-modified .

Examples of the bifunctional (meth) acrylic monomer include ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, polyolefin glycol di Glycol di (meth) acrylate, ethoxylated polypropylene glycol di (meth) acrylate, 2-hydroxy-1,3-dimethacryloxypropane, dioxane glycol di (meth) acrylate, tricyclodecane dimethanol 1,6-hexanediol di (meth) acrylate, 1,9-butanediol di (meth) acrylate, glycerin di (meth) acrylate, Acrylate, 1,10-decanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 2-methyl-1,8-octanediol di (Meth) acrylate, butyl ethyl propane diol di ) And the like acrylate, 3-methyl-1,5-pentanediol di (meth) acrylate.

Examples of the bifunctional (meth) acrylate having an aromatic ring include ethoxylated bisphenol A di (meth) acrylate, propoxylated ethoxylated bisphenol A di (meth) acrylate, ethoxylated bisphenol F di (meth) .

The polyfunctional (meth) acrylic monomers include, for example, ethoxylated glycerin tri (meth) acrylate, trimethylol propane tri (meth) acrylate, ethoxylated trimethylol propane tri (meth) acrylate, propoxylated trimethylol propane Tri (meth) acrylate, pentaerythritol tri (meth) acrylate, etc. (trifunctional monomer); (Tetrafunctional monomer) such as pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, ethoxylated pentaerythritol tetra (meth) acrylate; Dipentaerythritol hexa (meth) acrylate (pentafunctional monomer), dipentaerythritol polyacrylate, and the like.

(Meth) acrylic monomer having a low viscosity, (meth) acrylic acid having a relatively high glass transition temperature (Tg), and a (meth) acrylic monomer having a low viscosity are preferable for the purpose of improving the viscosity, workability, weather resistance, Acrylic monomer and a (meth) acrylic monomer having a relatively low glass transition temperature (Tg) may be used in combination.

The photo-curable resin composition of the present invention can be mixed with monofunctional, bifunctional, and polyfunctional (meth) acrylic monomers. When the monofunctional (meth) acrylic monomers, the bifunctional (meth) acrylic monomers and the polyfunctional (meth) acrylic monomers are mixed in a ratio of 1: 0.5 -1.5: 0.2-1 weight ratio.

Examples of the (meth) acrylic monomer used as the photopolymerizable monomer of the present invention include monovalent isoboryl acrylate, tetrahydrofuryl acrylate, tetrahydrofurfuryl acrylate, tetrahydrofurfuryl acrylate, It may be acryloyl morpholine (ACMO) or 2-phenoxyethyl acrylate, tripropyleneglycol diacrylate, polyethyleneglycol diarylate (diethyleneglycol diacrylate) Or 1,6-hexane diol diacrylate, and may be polyfunctional trimethylolpropane triacrylate, pentaerythritol triacrylate, di (meth) acrylate, One selected from among dipentaerythritol hexaacrylate, And the like of two or more kinds thereof. However, the present invention is not limited to the above-mentioned (meth) acrylic monomers, and the types of monofunctional or polyfunctional (meth) acrylic monomers mentioned above can be used without limitation.

For example, when isobornyl acrylate and / or acryloylmorpholine is used among the above-mentioned monofunctional (meth) acrylic monomers, even a solventless type composition can exhibit low viscosity, excellent solubility, and fast curability.

The content of the photopolymerizable monomer in the photocurable resin composition of the present invention may be 400 to 600 parts by weight based on 100 parts by weight of the (meth) acrylic resin. As the content of the (meth) acrylic monomer falls within the range described above, the viscosity of the composition and the crosslinking density can be appropriately adjusted to improve the adhesion of the cured coating film and improve the workability.

The photopolymerization initiator is excited by ultraviolet (UV) or the like in the photocurable resin composition according to an embodiment of the present invention to initiate photopolymerization. As the photopolymerization initiator, conventional photopolymerization initiators in the art can be used without limitation.

For example, the photopolymerization initiator may be Irgacure 184 (1-Hydroxy-cyclohexyl-phenylketone), Irgacure 369 (2-Benzyl-2- (dimethylamino) -1- [4- (4-morpholinyl) phenyl] Irgacure 651 (α, α'-dimethoxy-α-phenylacetophenone), Irgacure 819 (phenylphosphoryl) bis (mesitylmethanone), Irgacure 907 (2-Methyl- morpholinyl-1-propanone, Benzionalkylether, Benzophenone, Benzyl dimethyl katal, Hydroxycyclohexyl phenylacetone, Chloroacetophenone, 1 , 1,1-Dichloro acetophenone, Diethoxy acetophenone, Hydroxy Acetophenone, 2-Chlorothioxanthone, 2-ETAQ (2-Chlorothioxanthone) 2-Ethylnthraquinone, 1-Hydroxy-cyclohexyl-phenyl-ketone, 2-Hydroxy- 2-me hydroxy-1- [4- (2-hydroxyethoxy) phenyl] -2-methyl-1-propanone, (2-hydroxyethoxy) phenyl] -2-methyl-1-propanone, and methylbenzoylformate.

In the photocurable resin composition of the present invention, the content of the photoinitiator is 20 to 40 parts by weight based on 100 parts by weight of the (meth) acrylic resin. As the content of the photoinitiator falls within the above-mentioned range, the photopolymerization reaction can be sufficiently carried out without lowering the physical properties of the coating film.

The photo-curable resin composition may further include an additive selected from the group consisting of a silane-based compound and a siloxane-based compound.

The silane compound serves to impart adhesiveness to the coating film formed of the photocurable resin composition, and the siloxane compound can serve as a wetting agent for imparting wetting to the coating film formed of the photocurable resin composition .

The content of the silane-based compound or the siloxane-based compound is not limited and may be, for example, 0.1 to 5 parts by weight based on the total weight of the photocurable resin composition.

The photo-curing resin composition according to the present invention may further contain, without limitation, functional additives known in the art to the extent that the effects of the invention are not impaired. The content of the functional additive may be 1 to 10 parts by weight based on 100 parts by weight of the (meth) acrylic resin. Examples of usable functional additives include antioxidants, lubricants, leveling agents, surfactants, adhesion promoters, defoamers, , A solvent, a wetting agent, a light stabilizer, an anti-stain agent, a softener, a thickener, a polymer and the like. These may be used alone or in combination of two or more.

The antioxidant suppresses fading due to various oxidizing gases such as fading due to heat or light irradiation and ozone, active oxygen, NOx, SOx (X is an integer), and the like. By adding an antioxidant, Can be reduced. Examples of usable antioxidants include hydrazides, hindered amine antioxidants, nitrogen-nitrogen heterocyclic mercapto compounds, thioether antioxidants, hindered phenol antioxidants, ascorbic acids, zinc sulfate, thiocyanic acid Salts, thiourea derivatives, saccharides, nitrite salts, sulfite salts, thiosulfate salts, hydroxylamine derivatives and the like.

The leveling agent may be included for the purpose of further increasing the adhesion in the composition by leveling the curable composition so as to be flat and smoothly coated. The leveling agent may include acrylic type, silicone type, etc., alone or in combination of two or more. For example, it may include a polyether-modified polydimethylsiloxane, and may include a (meth) acryloyl group added to the polyether chain.

Surfactants may be included for the compatibilization and application uniformity of the curable composition. Examples of the surfactant include cationic, anionic, amphoteric and nonionic surfactants known in the art. For example, at least one of a fluorine-based surfactant, a silicon-based surfactant, and a fluorine-silicon- Can be used.

The antifoaming agent is a mixture of a hydrophilic and a polysiloxane, and can act to increase the appearance of the coating film by breaking bubbles generated during coating. The antifoaming agent may be included in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the functional additive.

The light stabilizer has an effect of enhancing the weatherability of the coating film as an ultraviolet absorber. The light stabilizer may be included in an amount of 1.0 to 3 parts by weight based on 100 parts by weight of the functional additive. The effect of improving the weatherability of the coating film within the above- have.

The softening agent may be included in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the functional additive. It is possible to alleviate the occurrence of cracks in the coating film cured within the above-mentioned range to improve the impact resistance and flex resistance.

The photocurable resin composition according to this embodiment is used in a process for manufacturing a window member used in a display device, and more particularly, can be used for forming a resin layer for forming a decoration pattern in a bezel region of a window member.

The photocurable resin composition according to one embodiment of the present invention is prepared by blending a non-curable acrylic resin with a photocurable resin. The photocurable resin composition according to an embodiment of the present invention is based on a photocurable resin containing a urethane acrylate oligomer and a photopolymerizable monomer, wherein the (meth) acrylic resin in which the acrylic monomer is copolymerized is in the above- Mixed, and the properties can be controlled.

Accordingly, the coating film formed from the photo-curable resin composition according to an embodiment of the present invention has flexible properties and the glass transition temperature (Tg) can be controlled to improve the adhesion and surface hardness of the coating film .

Hereinafter, a window member and a manufacturing method thereof according to an embodiment of the present invention will be described.

1 is a perspective view of a display device including a window member according to an embodiment of the present invention. 2 is an exploded perspective view of the display device shown in Fig. 3 is a cross-sectional view showing a part of the configuration of the display device shown in Fig. Hereinafter, a display device DD including a window member WU according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

A flat mobile terminal as an example of the display device DD according to an embodiment of the present invention is exemplarily shown. However, the present invention is not limited thereto, and can be applied to various display devices (DD) such as a curved display device, a banding display device, a rollable display device, a foldable display device, and a stressable display device. Also, although not separately shown, the display device DD according to the present invention can be used in a wide range of applications including, but not limited to, a large electronic device such as a television or an external billboard, a personal computer, a notebook computer, a personal digital terminal, a car navigation unit, a game machine, A clock-type electronic device, and a small-sized electronic device such as a camera. It should be understood that the present invention can be applied to other electronic devices as long as they do not deviate from the concept of the present invention.

The display device DD includes a plurality of regions that are distinguished on the display surface. The display device DD may include a display area DR in which the image IM is displayed and a non-display area NDR adjacent to the display area DR. The display surface on which the image IM is displayed is parallel to the plane defined by the first direction DR1 and the second direction DR2 and the normal direction of the display surface is indicated by the third direction DR3. The third direction DR3 is a reference axis for distinguishing the front surface and the back surface of the respective members. In this specification, the plane defined by the second direction DR2 of the first direction DR1 is defined as a plane and viewed on the plane can be defined as viewed in the third direction DR3.

The display device DD may include a display panel DP, a window member WU, and a housing member CU.

The display panel DP can be divided into a display area overlapping with the display area DR of the display device DD on the plane and a non-display area overlapping with the non-display area NDR of the display device DD. The display panel DP can provide an image corresponding to the image data input through the display area.

The display panel DP may be employed in various forms such as an organic light emitting display panel, a liquid crystal display panel, a plasma display panel, an electrophoretic display panel, and an electrowetting display panel. In the present embodiment, the case where the display panel DP is an organic light emitting display panel will be described as an example.

The display panel DP may include a base substrate BS, a circuit layer CL, an organic light emitting element layer EL, an encapsulation layer ECL, a pad portion PAD, and a touch sensing unit TS .

The base substrate (BS) may include at least one of a glass substrate, a sapphire substrate, and a plastic substrate. A circuit layer CL, an organic light emitting element layer EL, an encapsulation layer ECL, a pad portion PAD, and a touch sensing unit TS may be disposed on the base substrate BS.

The circuit layer CL may include a plurality of signal lines and electronic elements provided on the display panel DP. For example, the circuit layer CL may include thin film transistors corresponding to gate lines, data lines, and pixels, respectively.

The organic light emitting element layer EL can generate light of a color corresponding to the light emitting material. The color may include, but is not limited to, red, green, blue, and white.

The encapsulation layer (ECL) may include a thin film encapsulation layer (TFE), that is, a plurality of inorganic thin films and a plurality of organic thin films. The encapsulation layer (ECL) covers the organic light emitting element layer (EL), and shields air and moisture to protect the organic light emitting element layer (EL). In one embodiment of the present invention, the encapsulation layer (ECL) may be replaced by an encapsulation substrate. The encapsulation substrate is disposed apart from the base substrate BS via the organic light emitting element layer EL. The encapsulation substrate and the base substrate (BS) may be joined by a sealant disposed along the rim of the base substrate (BS).

The touch sensing unit TS may be disposed on the sealing layer ECL. The position of the touch sensing unit TS is exemplarily shown, but not limited thereto. For example, the touch sensing unit TS may be disposed between the organic light emitting element layer EL and the sealing layer ECL, or may be disposed between the base substrate BS and the circuit layer CL. Further, the touch sensing unit TS may be included in the window member WU instead of the display panel DP.

The touch sensing unit TS can acquire the coordinate information of the input point. The touch sensing unit is classified into a resistance film type, a capacitance type, and an electromagnetic induction type. In this embodiment, the touch sensing unit may be a capacitive touch panel. The touch sensing unit may include two kinds of sensors that cross each other, and the kind thereof is not limited. The capacitance type touch panel can acquire coordinate information of a touched point by a self-capacitance method or a mutual-capacitance method.

Although not shown, the display panel DP may include an optical member. The optical member may be disposed on the touch sensing unit TS. However, the position of the optical member is not limited thereto. The optical member may include at least one of a phase delay plate and a polarizing plate. When the optical member includes both the retardation plate and the polarizing plate, the polarizing plate may be disposed on the phase retarding plate. External light incident from the outside of the window member WU passes through the polarizing plate and linearly polarized. The linearly polarized incident light passes through the phase retardation plate, is reflected, passes through the phase retardation plate again, and is incident on the polarizing plate. The linearly polarized incident light passes through the phase delay plate and has a phase difference of 45 degrees and is circularly polarized to change its phase. As a result, the external light passes through the phase retardation plate again, passes through the polarizing plate, and mostly disappears. For example, light that has passed through the phase delay plate and is reflected by right-turn circularly polarized light is converted into left-turn circularly polarized light, and right-turn circularly polarized light and left-turn circularly polarized light can be canceled by destructive interference. Thus, the external light reflectance of the display device DD is reduced.

The pad portion PAD may include pads electrically connected to each other in a one-to-one correspondence with a plurality of signal lines electrically connected to a plurality of pixels. The pad portion PAD may be electrically connected to the flexible circuit board FC.

The flexible circuit board FC is attached to one end of the display panel DP and can be bent to the back surface of the display panel DP. The flexible circuit board FC is electrically connected to the pad portion PAD and can receive signals for driving the display panel DP from the driving circuit board PCB. Further, the flexible circuit board FC can transmit the signals to the display panel DP. A data driving chip (not shown) may be mounted on one surface of the flexible circuit board FC. The data driving chip may generate a data signal applied to the data lines of the display panel DP in response to an external signal.

The driving circuit board PCB may be disposed on the back surface of the display panel DP. The driving circuit board PCB may be electrically connected to the display panel DP by a flexible circuit board FC. The driving circuit board PCB may provide a video signal for displaying an image on the display panel DP and a control signal for driving the display panel DP.

The driving circuit board (PCB) includes a base substrate, and the base substrate may be a flexible printed circuit board. In this case, the base substrate may be a flexible plastic substrate such as polyimide or polyester.

The protective member PP may be disposed between the display panel DP and the driving circuit board PCB. The protective member PP may include at least one of a buffer member and a radiation member. The buffer member may include a material having a high shock absorption rate. For example, the buffer member may be formed of a polymer resin (for example, polyurethane, polycarbonate, polypropylene, and polyethylene), or may be formed of a rubber liquid, a urethane- But is not limited thereto.

The heat dissipating member may include at least one of graphite, copper (Cu), and aluminum (Al) having good heat dissipation characteristics, but is not limited thereto. The heat dissipating member not only improves the heat dissipation characteristics but also has electromagnetic wave shielding or electromagnetic wave absorption characteristics.

The window member WU may be disposed on the display panel DP. The window member WU and the display panel DP can be attached to each other by the panel adhesive layer AL2. The panel adhesive layer AL2 may include an optically clear adhesive film or an optical clear resin. In another embodiment of the present invention, the panel adhesive layer AL2 may be omitted. In this case, the window member WU and the display panel DP may be in contact with each other without the panel adhesive layer AL2, or may be disposed with a predetermined spacing therebetween.

The window member WU may include a cover member WD, a window adhesive layer AL1, and a light-transmitting film BF.

The cover member WD may include any one of a silicon substrate, a glass substrate, a sapphire substrate, and a plastic film, but is not limited thereto. In an embodiment of the present invention, the cover member WD may be a glass substrate.

The translucent film BF may be a transparent film through which light is transmitted. The light transmitting film (BF) is not limited to the light transmittance of 100%. For example, the light transmittance of the light transmitting film (BF) may have a value of 100% or less. The translucent film (BF) may include, but is not limited to, any one of PET, PVC, PP, PE, PC, and PMMA.

A print layer may be disposed on one side of the light transmitting film (BF). The description thereof will be described in more detail in Fig.

A window adhesive layer AL1 may be disposed between the cover member WD and the light transmitting film BF. The cover member WD and the light transmitting film BF can be attached to each other by the window adhesive layer AL1. The window adhesive layer AL1 may include an optically clear adhesive film or an optical clear resin.

The housing member CU accommodates the display panel DP and can be engaged with the window member WU. The housing member CU may comprise a plurality of parts assembled or one injection molded body. The housing member CU may comprise glass, plastic or metal.

4 is a cross-sectional view taken along the line I-I 'in Fig. 4, only the window member WU is shown, and the display panel DP and the accommodation member CU described in Fig. 3 are omitted. Hereinafter, a window member WU according to an embodiment of the present invention will be described with reference to FIG. In the meantime, the same reference numerals are assigned to the same components as those described in Figs. 1 to 3, and redundant description is omitted.

4, the window member WU includes a cover member WD, a window adhesive layer AL1, a light transmitting film BF, a vapor deposition layer PL, a molding layer ML, and a light blocking layer BL .

The cover member WD may include a bezel area NDA and a transmissive area DA defined on a plane. The bezel area NDA overlaps with the non-display area NDR of FIG. 1 in advance and the transmissive area DA can overlap the display area DR of FIG. 1 in a plane.

The translucent film BF is disposed below (below) the cover member WD. That is, the translucent film BF can be disposed between the cover member WD and the display panel (DP in Fig. 2). The light transmitting film (BF) may include one surface and another surface facing each other. The molding layer ML may be disposed on one surface of the light transmitting film BF and the cover member WD may be disposed on the other surface.

The molding layer ML may be disposed under one side of the light-transmitting film BF. The molding layer ML may be formed directly on one surface of the light transmitting film BF. Although not shown, a primer layer may be further disposed between the molding layer ML and the light transmissive film BF to improve adhesion.

The molding layer ML may be formed through the photocurable resin composition according to an embodiment of the present invention.

Specifically, the molding layer ML is prepared by mixing 10 to 50 parts by weight of a urethane acrylate oligomer, 400 to 600 parts by weight of a photopolymerizable monomer and 20 to 40 parts by weight of a photopolymerization initiator, based on 100 parts by weight of a (meth) acrylic resin copolymerized with an acrylic monomer And a photo-curing resin composition comprising a photo-curable resin. A detailed description of the photocurable resin composition having the above composition is omitted because the above description can be applied as it is.

One surface of the molding layer ML may be in contact with the translucent film BF and the other surface of the molding layer ML may be provided with the pattern PT. The pattern PT may overlap the bezel area NDA in a plan view when viewed in the third direction DR3. In FIG. 4, the pattern PT is shown as being superimposed on the bezel area NDA on a plane and not overlapping the transmissive area DA, but the present invention is not limited to this, and a pattern overlapping the transmissive area DA may be provided.

The pattern PT can irregularly reflect the light incident from the outside. Although FIG. 4 exemplarily shows that the pattern PT has a prism shape, it is not limited thereto. The pattern PT may be a decoration pattern, a three-dimensional pattern formed by a fine hair line, or various patterns such as a wavy pattern.

The deposition layer PL may be disposed under the pattern PT. The deposition layer PL may be disposed in a superposed manner on the planar bezel region NDA. The deposition layer PL may include a material having a predetermined hue. Alternatively, the deposition layer PL may comprise a reflective material. The deposition layer PL can reflect or absorb light incident from the outside. The deposition layer PL may have a structure in which one or more layers or two or more layers are laminated.

The light blocking layer BL may be disposed under the deposition layer PL. The light blocking layer BL may have a black color. However, the present invention is not limited thereto. The light blocking layer BL may be disposed under the deposition layer PL so that the color of one area of the window member WU can be seen more clearly.

The light blocking layer BL may be formed through a printing process under the vapor deposition layer PL. However, the present invention is not limited thereto, and the light blocking layer BL may be provided as a predetermined auxiliary material. In this case, the light blocking layer BL can be adhered under the vapor deposition layer PL.

The window member WU can be produced in various colors according to the demand of the user. For example, one area of the window member WU that overlaps the bezel area NDA can be viewed by the user in various colors, such as white, black, blue, gold, pink, and green. The various colors of one area overlapping the bezel area NDA of the window member WU are formed by the pattern PT formed on one side of the molding layer ML and the vapor deposition layer PL disposed on the pattern PT Lt; / RTI >

5 is a flowchart illustrating a method of manufacturing a window member according to an embodiment of the present invention. 6A to 6E are sectional views sequentially illustrating a method of manufacturing a window member according to an embodiment of the present invention. Hereinafter, a method of manufacturing a window member according to an embodiment of the present invention will be described with reference to FIGS. 5 to 6E. FIG.

5, a method of manufacturing a window member according to an exemplary embodiment of the present invention includes a step of preparing a light transmitting film S100, a step S200 of forming a molding layer on one surface of the light transmitting film S200, And attaching the cover member on the other side of the film (S300).

5 and 6A, a molding layer is formed on one surface of the prepared light-transmitting film BF in the step of preparing a light-transmitting film (S100) and the step of forming a molding layer on one surface of the light-transmitting film (S200) The photocurable resin composition (CM) according to an embodiment of the present invention is applied. The photo-curable resin composition (CM) according to an embodiment of the present invention is prepared by mixing 10 to 50 parts by weight of a urethane acrylate oligomer, 400 to 600 parts by weight of a photopolymerizable monomer And 20 to 40 parts by weight of a photopolymerization initiator. A detailed description of the photocurable resin composition having the above composition is omitted because the above description can be applied as it is.

Referring to Figs. 6A and 6B, the photocurable resin composition CM can be applied over the entire surface of the light-transmitting film BF through the nozzle NZ. However, the present invention is not limited to this, and the photo-curable resin composition (CM) may be partially applied on one surface of the light-transmitting film (BF).

Referring to FIGS. 6B and 6C, the applied photocurable resin composition (CM) is cured to form a molding layer (ML). The photocurable resin composition (CM) may be one which is cured by ultraviolet (UV) light. The photo-curing resin composition (CM) according to an embodiment of the present invention includes a photo-curable resin that can be cured by ultraviolet rays or the like as a component and is easily formed into a molding layer ML through ultraviolet (UV) irradiation . Photo-curing resin composition (CM) may be cured in the ultraviolet curing conditions of 300 mJ / cm ² to 1500mJ / cm ^2.

A pattern PT may be formed on one surface of the molding layer ML. The pattern PT may be formed by forming a predetermined pattern on a partial area of the photocurable resin composition CM applied before curing the photocurable resin composition CM in the process of forming the molding layer ML, . The pattern PT may be formed so as to overlap the bezel area NDA overlapping the non-display area (NDR: see Fig. 1) of the display device. However, the present invention is not limited to this, and the pattern PT may be formed so as to overlap the transmissive region DA.

Referring to FIG. 6D, a deposition layer PL and a light blocking layer BL may be formed on the molding layer ML.

The deposition layer PL may be formed by depositing an organic material or an inorganic material. For example, the deposition layer PL may be formed of an organic material having a predetermined hue, or may be formed by depositing a reflective metal oxide or the like.

The light blocking layer BL may be formed through a printing process through an ink having a property of blocking black or light. However, the present invention is not limited thereto, and the light blocking layer BL may be provided as a predetermined auxiliary material. In this case, the light blocking layer BL can be adhered under the vapor deposition layer PL.

6E, a cover member WD is attached on the other surface of the light transmitting film BF. The cover member WD may be attached on the opposite surface of the light transmissive film BF opposite to the one surface on which the molding layer ML, the vapor deposition layer PL, and the light blocking layer BL are formed. The cover member WD can be attached to the light-transmitting film BF through the window adhesive layer AL1. The window adhesive layer AL1 may include an optically clear adhesive film or an optical clear resin.

Although not shown, a panel adhesive layer (see FIG. 2: AL2) may be additionally formed on the molding layer ML. The panel adhesive layer AL2 formed on the molding layer ML may be a layer for adhering the display panel (DP in Fig. 2) and the window member WU. The panel adhesive layer AL2 may be formed on the molding layer ML to cover the vapor deposition layer PL and the light blocking layer BL.

The panel adhesive layer AL2 may include an optically clear adhesive film or an optical clear resin. Panel adhesive layer (AL2) is by a transparent adhesive film or the optical resin for an optical, ultraviolet ray in the bonding process 3000 mJ / cm ² to 5000mJ / cm ² can be irradiated.

The window member according to an embodiment of the present invention includes a molding layer formed through a photocurable resin composition produced by blending a non-curable acrylic resin with a curable resin. The photocurable resin composition according to an embodiment of the present invention is a photocurable resin composition comprising a photocurable resin containing a urethane acrylate oligomer and a photopolymerizable monomer as a base, wherein the (meth) acrylic resin in which the acrylic monomer is copolymerized is mixed So that the physical properties can be controlled. Accordingly, the molding layer of the window member formed of the photo-curable resin composition according to an embodiment of the present invention is excellent in adhesion to the vapor deposition layer and the light transmitting film, is not easily peeled off under high temperature and high humidity conditions, It can have strong characteristics.

In addition, since the molding layer of the window member according to an embodiment of the present invention has such excellent properties as described above, additional ultraviolet rays are irradiated in a post-process such as forming an adhesive layer or the like on a molding layer, It is possible to prevent the occurrence of cracks and prevent the peeling between the molding layer and the vapor deposition layer, and to provide a window member of excellent quality.

Hereinafter, the photocurable resin composition according to the present invention will be specifically described with reference to Examples and Comparative Examples.

(Preparation of photocurable resin composition)

The photocurable resin composition of the present invention is prepared by mixing a photopolymerizable monomer ((meth) acrylic monomer), a photopolymerization initiator and a functional additive with a high-speed stirrer for 45 minutes, adding urethane acrylate oligomer to the mixture, , Followed by addition of a (meth) acrylic resin and stirring for 1 hour.

The composition ratios of the photocurable resin compositions according to Examples 1 to 5 and the photocurable resin compositions according to Comparative Examples 1 to 4 were prepared as shown in Table 1 below. The units representing the content of each component in Table 1 indicate the ratio of each part by weight based on 100 parts by weight of the (meth) acrylic resin.

(Meth) acrylic resin Urethane acrylate oligomer Photopolymerizable monomer Photopolymerization initiator Functional additive One 2 3 4 5 6 One 2 One 2 Example 1 100 35 50 150 120 30 100 80 25 10 One 2 Example 2 100 35 50 100 120 30 100 100 25 10 One One Example 3 100 35 50 150 150 30 100 80 25 5 One 2 Example 4 100 35 50 150 120 30 100 80 20 10 One One Example 5 100 35 50 150 120 30 100 80 25 10 One 2 Comparative Example 1 0 135 50 120 120 30 100 80 25 10 One 2 Comparative Example 2 100 0 50 155 155 30 100 80 25 10 One 2 Comparative Example 3 100 35 50 0 0 0 100 80 25 10 One 2 Comparative Example 4 100 35 50 120 120 30 100 80 0 10 0 2

The materials listed in Table 2 below were used as specific materials used for each component in Table 1. In Examples 1 to 4 and Comparative Examples 1 to 4, a (meth) acrylic resin having a molecular weight of 30,000 was used. In Example 5, a (meth) acrylic resin having a molecular weight of 65,000 was used. Table 2 also lists the physical properties of each substance.

Component ingredient Physical property (Meth) acrylic resin MMA-BMA Copolymer
(MMA / BMA = 1 / 0.31) Glass transition temperature: 75 캜
Molecular weight: 30,000 MMA-BMA Copolymer
(MMA / BMA = 1 / 0.09) Glass transition temperature: 52 캜
Molecular weight: 65,000 Urethane acrylate oligomer Urethane Acrylate Viscosity: 5,000 cps (25 ° C)
Molecular weight: 10,000 Photopolymerizable monomer One Isobornyl acrylate Viscosity: 11 cps (25 캜)
Glass transition temperature: 88 占 폚 2 1,6-Hexanediol diacrylate Viscosity: 8 cps (25 ° C)
Glass transition temperature: 43 캜 3 Pentaerythritol triacrylate Viscosity: 800 cps 4 Acryloyl morpholine Viscosity: 12 mPas (25 캜)
Glass transition temperature: 145 캜 5 Tetrahydrofurfuryl acrylate Viscosity: 2.8 cps
Glass transition temperature: -12 ° C 6 Polyethyleneglycol diacrylate Glass transition temperature:
7 ℃ Light curing
Initiator One 2-Hydroxy-2-methyl-1-phenyl
-propan-1-one Molecular weight: 164.2 2 Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide Molecular weight: 348.4 Functional
additive One Leveling agent
(BYK UV3535) - 2 Adhesion promoter
(KBM403) -

Referring to Tables 1 and 2, the photocurable resin composition according to Example 1 of the present invention was prepared by mixing 100 parts by weight of a methyl methacrylate (MMA) -butylmethacrylate (BMA) copolymer, 35 parts by weight of a urethane acrylate oligomer, 150 parts by weight of 1,6-hexanediol diacrylate, 120 parts by weight of pentaerythritol triacrylate, 30 parts by weight of acryloylmorpholine, 100 parts by weight of tetrahydrofurfuryl acrylate, 50 parts by weight of polyethylene 25 parts by weight of 2-hydroxy-2-methyl-1-phenylpropan-1-one, 10 parts by weight of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, 1 part by weight, and 2 parts by weight of an adhesion promoter.

The photo-curable resin composition according to Example 2 of the present invention comprises 100 parts by weight of 1,6-hexanediol diacrylate, 100 parts by weight of polyethylene glycol diacrylate, and 1 part by weight of an adhesion promoter Except that, the photocurable resin composition of the same weight as in Example 1 is included.

The photo-curing resin composition according to Example 3 of the present invention contains 150 parts by weight of pentaerythritol triacrylate, except that it contains 5 parts by weight of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide , And a photocurable resin composition having the same weight as in Example 1. [

The photo-curable resin composition according to Example 4 of the present invention contains 20 parts by weight of 2-hydroxy-2-methyl-1-phenylpropan-1-one and contains 1 part by weight of an adhesion promoter. And a photocurable resin composition having the same weight as in Example 1. [

The photo-curing resin composition according to Example 5 of the present invention had a glass transition temperature of 52 占 폚. (Meth) acrylic resin having a molecular weight of 65,000 was used in place of the (meth) acrylic resin having a molecular weight of 65,000.

The photocurable resin composition according to Comparative Example 1 of the present invention was obtained by the same method as in Example 1 except that the methyl methacrylate-butyl methacrylate copolymer was not included and 135 parts by weight of urethane acrylate was contained, ≪ / RTI >

The photo-curable resin composition according to Comparative Example 2 of the present invention contains no urethane acrylate, 155 parts by weight of 1,6-hexanediol diacrylate, and 155 parts by weight of pentaerythritol triacrylate. And a photo-curing resin composition having the same weight as that of the first embodiment.

The photocurable resin composition according to Comparative Example 3 of the present invention had the same weight as that of Example 1 except that 1,6-hexanediol diacrylate, pentaerythritol triacrylate, and acryloylmorpholine were not included. And a photocurable resin composition.

The photocurable resin composition according to Comparative Example 4 of the present invention contained 120 parts by weight of 1,6-hexanediol diacrylate, and 2-hydroxy-2-methyl-1-phenylpropan-1- The photocurable resin composition of the present invention contains a photocurable resin composition having the same weight as that of the photocurable resin composition of Example 1. [

(Experimental Example of Photocurable Resin Composition-Evaluation of Properties of Cured Film)

The properties of the cured films prepared by curing the photocurable resin compositions of Examples 1 to 5 and Comparative Examples 1 to 4 were measured. As the evaluation method of the cured film, the evaluation method described in Table 3 below was used.

Evaluation items Assessment Methods Target characteristics Attachment 1mmx1mmx100EA Cross-cut Nichiban Tape (JIS Z 1522)
Repeated forced release 3 times Good (100/100) Adhesion to hot water After standing at 100 ° C in distilled water for 30 minutes, the adhesion test Good (100/100) Adhesion after UV curing After UV molding, 4,000 mJ / cm < ² > Good (100/100) QUVE
(Weatherability evaluation) QUV A Adhesion test after 72 hours Good (100/100) Thermal shock
(Liquid nitrogen) Apply UV-based ink on UV molding material and cure (150 ℃, 30min). After attaching it on tempered glass, put it in liquid nitrogen, hold it for 3 minutes, and leave it at room temperature for 30 minutes. Check the occurrence of cracks in the UV molding material with an optical microscope. No crack High temperature and high humidity
(50/95) Adhesion evaluation after standing at 50 ° C / 95% high temperature and high humidity for 72 hours Good (100/100) High temperature and high humidity
(85/85) After 72 hours in a high temperature and high humidity apparatus at 85 ° C / 85%, adhesion evaluation Good (100/100)

Table 4 below shows the results of the evaluation by the evaluation method described in Table 3 above.

Property evaluation items Attachment
(PET) My hot water
Attachment
(PET) Adhesion after UV curing
(PET) QUVE
(72hrs) Thermal shock
(Liquid nitrogen) High temperature and high humidity
(50/95) High temperature and high humidity
(85/85) Example 1 100/100 100/100 100/100 100/100 No crack 100/100 100/100 Example 2 100/100 100/100 100/100 100/100 No crack 100/100 100/100 Example 3 100/100 100/100 100/100 100/100 No crack 100/100 100/100 Example 4 100/100 100/100 100/100 100/100 No crack 100/100 100/100 Example 5 100/100 100/100 100/100 100/100 No crack 100/100 100/100 Comparative Example 1 100/100 45/100 40/100 72/100 crack 30/100 0/100 Comparative Example 2 80/100 65/100 62/100 54/100 No crack 45/100 45/100 Comparative Example 3 100/100 100/100 35/100 31/100 crack 45/100 40/100 Comparative Example 4 20/100 0/100 0/100 0/100 crack 0/100 0/100

Table 4 shows that the cured films formed from the photo-curable resin compositions of Examples 1 to 5 of the present invention had excellent properties such as adhesion and weatherability and had defects even under ultraviolet curing, thermal shock, and high temperature and high humidity conditions . As a result, the photocurable resin composition according to the present invention can be used as a photocurable resin composition containing a (meth) acrylic resin, a urethane acrylate oligomer, a photopolymerizable monomer ((meth) acrylic monomer) and a photopolymerization initiator It can be seen that a photocurable molding layer can be formed.

The photocurable resin composition of Comparative Example 1 did not contain a (meth) acrylic resin, and the adhesiveness and weatherability were poor, and it was found that defects occurred under conditions of ultraviolet curing, thermal shock, and high temperature and high humidity.

The photo-curable resin composition of Comparative Example 2 contained a (meth) acrylic resin and did not cause defects due to thermal shock but did not contain a urethane acrylate oligomer, resulting in deterioration of adhesion and weatherability. In addition, Can be seen.

The photocurable resin composition of Comparative Example 3 contains 230 parts by weight of a photopolymerizable monomer ((meth) acrylic monomer) relative to 100 parts by weight of a (meth) acrylic resin, so that the viscosity and cross- And weather resistance are deteriorated, and defects occur under ultraviolet curing, thermal shock, and high temperature and high humidity conditions.

(Meth) acrylic resin, a urethane acrylate oligomer and a photopolymerizable monomer ((meth) acrylic monomer)) are contained similarly to the example composition, but the photopolymerization initiator is contained in a small weight ratio, The leveling agent is not included and adhesiveness and weatherability are deteriorated, and it is found that defects occur under ultraviolet ray hardening, thermal shock, and high temperature and high humidity conditions.

FIG. 7A is a photograph of a result of evaluating whether or not a crack occurred in a cured molding layer made of a photo-curable resin composition according to an embodiment of the present invention. FIG. 7B is a photograph showing the result of evaluating whether or not a crack occurred in the cured molding layer made of the photo-curing resin composition according to the comparative example.

FIG. 7B is a photograph showing the result of evaluating whether or not a crack occurred in a hardened molding layer made of a photo-curing resin composition containing no (meth) acrylic resin. Referring to FIGS. 7A and 7B, it can be seen that the hardened molding layer made of the photo-curing resin composition according to the embodiment of the present invention has reduced defects that cracks are generated as compared with the comparative example.

A photocurable resin composition according to an embodiment of the present invention is a photocurable resin composition prepared by mixing a photocurable resin containing a urethane acrylate oligomer and a photopolymerizable monomer as a base and a (meth) acrylic resin as a non- do. Accordingly, the cured molding layer formed of the photo-curing resin composition according to an embodiment of the present invention has excellent adhesion and weatherability, and resistance to ultraviolet ray curing, thermal shock, high temperature and high humidity conditions is increased, have. Therefore, when a molding layer of a window member is formed with a photo-curable resin composition according to an embodiment of the present invention, it may be exposed to ultraviolet radiation or exposed to high temperature, high humidity, thermal shock, or the like in a subsequent step such as adhesive layer formation or rework. A window member for a display device in which defects such as peeling do not occur can be provided.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It will be understood that various modifications and changes may be made thereto without departing from the scope of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

DD: Display unit WU: Window member
BF: Transparent film WD: Cover member
ML: molding layer PL: vapor deposition layer
BL: Light-blocking layer PT: Pattern

Claims (14)

Based on 100 parts by weight of (meth) acrylic resin,
10 to 50 parts by weight of a urethane acrylate oligomer,
400 to 600 parts by weight of a photopolymerizable monomer and
And 20 to 40 parts by weight of a photopolymerization initiator. The method according to claim 1,
The (meth) acrylic resin
A weight average molecular weight of 10,000 to 70,000,
Wherein the glass transition temperature is 50 占 폚 to 90 占 폚. The method according to claim 1,
The photopolymerizable monomer
(Meth) acrylic monomer, a bifunctional (meth) acrylic monomer, and a polyfunctional (meth) acrylic monomer. The method of claim 3,
The photopolymerizable monomer may contain,
(Meth) acrylic monomer, a bifunctional (meth) acrylic monomer, and a polyfunctional (meth) acrylic monomer in a weight ratio of 1: 0.5 to 1.5: 0.2 to 1. The method according to claim 1,
The photopolymerizable monomer
Acrylate, isobornyl acrylate (IBOA), tetrahydrofuryl acrylate, tetrahydrofurfuryl acrylate acryloyl morpholine, 2-phenoxyethyl acrylate (2 polyoxyethylene stearate, polyoxyethylene stearate, polyoxyethylene stearate, polyoxyethylene stearate, phenoxyethyl acrylate, tripropyleneglycol diacrylate, polyethyleneglycol diarylate, 1,6-hexane diol diacrylate and trimethylolpropane triacrylate wherein the photocurable resin composition contains at least one selected from the group consisting of trimethylolpropane triacrylate, pentaerythritol triacrylate and dipentaerythritol hexaacrylate. The method according to claim 1,
Wherein the photocurable resin composition forms a pattern layer of a window member included in a display device. Preparing a light transmitting film comprising a transmissive region through which light is transmitted and a bezel region surrounding the transmissive region;
Applying a photo-curable resin composition on one surface of the translucent film, curing the photo-curable resin composition to form a molding layer, and
Attaching a cover member on the other surface of the translucent film,
The photo-curing resin composition
Based on 100 parts by weight of (meth) acrylic resin,
10 to 50 parts by weight of a urethane acrylate oligomer,
400 to 600 parts by weight of a photopolymerizable monomer and
And 20 to 40 parts by weight of a photopolymerization initiator. 8. The method of claim 7,
After the step of forming the molding layer
Depositing an organic material or an inorganic material so as to overlap the bezel region in a plane on the molding layer to form a vapor deposition layer; and
And forming a light blocking layer on the deposition layer. 9. The method of claim 8,
And forming a pressure-sensitive adhesive layer on the molding layer. 10. The method of claim 9,
Wherein the adhesive layer comprises an optically clear adhesive film or an optical resin (Optical Clear Resin). 10. The method of claim 9,
Wherein the adhesive layer is formed to cover the deposition layer and the light blocking layer. 9. The method of claim 8,
Wherein a pattern is defined on one side of the molding layer in contact with the deposition layer, the pattern overlapping the bezel region in a planar manner. 8. The method of claim 7,
In the step of forming the molding layer
Wherein the photo-curable resin composition is ultraviolet cured. 8. The method of claim 7,
Wherein the photopolymerizable monomer comprises a monofunctional (meth) acrylic monomer, a bifunctional (meth) acrylic monomer, and a polyfunctional (meth) acrylic monomer.

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