KR101697049B1 - Protective film for display of mobile device having self bending function - Google Patents

Abstract

The present invention relates to a protective film for a mobile device having a self-bending function and, more specifically, relates to a protective film for a mobile device having a self-bending function wherein in the protective film attached to protect a surface of a display from an external impact, adhesive property with respect to the surface of the display which is bent is improved to provide improvement in quality and convenience in use. According to the present invention, the protective film for the mobile device having the self-bending function comprises: a base layer; a hard coating layer; an adhesive layer; a molding layer; and a release film.

Description

PROTECTIVE FILM FOR DISPLAY OF MOBILE DEVICE HAVING SELF BENDING FUNCTION FIELD OF THE INVENTION [0001]

The present invention relates to a protective film for a mobile device having a self-bending function, and more particularly, to a protective film for protecting a display surface from an external impact, And to provide a self-bending function for the mobile terminal to provide ease of use and improvement.

In general, with the rapid growth of IT technology and the development of Internet services, mobile devices such as smart phones and tablet PCs are spreading, and the size of related market such as mobile accessories is also growing rapidly.

Such a mobile accessory is made up of various kinds such as an earphone, a cradle for mounting a mobile device for charging, a cover case for covering the body of the mobile device, and a protective film attached to a front display of the mobile device.

Double protective films are most commonly used to protect the display surface against scratches, pressing, scratches, etc. caused by external shocks in the course of using mobile devices such as smart phones and tablet PCs in daily life.

A general structure of the protective film will be briefly described. As shown in FIG. 1, a base layer composed of a polyethylene terephthalate (PET) film and serving as a support, A hard coating layer disposed on one side of the substrate layer for securing abrasion resistance, an adhesive layer disposed on the other side of the substrate layer so as to be adhered to the display surface glass, a releasable film detachably attached to the adhesive layer, and a release film.

When the release film (peeling paper) is first peeled off and the adhesive layer is attached to the display surface glass in order to use the protective film 10 having the above structure, the adhesive film is adhered to the surface of the display D1 of the mobile device And protects the display while it is attached.

In recent years, various products having various designs have been released in the fierce competition of mobile device makers such as smart phones. In this process, a curved surface or a curved surface which can fold or bend in a flat flat surface of the display As a device having a shape of curved, bended, foldable, and rollable has been developed, it is difficult to apply a protective film having a conventional structure.

That is, in the conventional protective film, edge portions of the protective film adhered to the curved glass surface of the display surface due to the restoring force of the substrate layer having stiff properties are lifted as the use period passes.

In order to overcome this problem, there is a method of increasing the adhesive strength of the adhesive layer constituting the protective film. However, in this case, when the user attaches the protective film to the smartphone, It is difficult to remove the protective film.

In addition, there is a method of applying a soft synthetic resin film as a substrate layer to correspond to the curved surface of the display surface glass. However, even in such a case, the protective film 20).

Korean Patent No. 1580502 entitled "Tempered Glass Protective Film for Screen Protecting Mobile Phone Display" (Dec. 21, 2015) Korean Patent Registration No. 1221441 entitled " Protective Film for Display Panels of Portable Electronic Devices Having Curved Surfaces "(2013.01.07)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a protective film for mobile devices having a self-bending function for improving the quality of a protective film, The purpose is to provide.

In order to achieve the above object, a protective film for a mobile device having a self-bending function according to a preferred embodiment of the present invention includes: a base layer formed of a synthetic resin film and serving as a support; A hard coat layer formed on the surface of the substrate layer to impart strength; An adhesive layer disposed on the back surface of the substrate layer and imparting adhesive force to the substrate layer so as to adhere to the surface of the display; A molding layer formed between the base layer and the adhesive layer and cured by ultraviolet rays to conform to the surface shape of the display; And a release film detachably attached to the back surface of the adhesive layer.

The molding layer constituting the protective film according to the present invention is obtained by synthesizing an acrylic resin having a glass transition temperature not higher than room temperature and then mixing a photoreactive oligomer capable of performing an ultraviolet curing reaction and a photoinitiator for initiating an ultraviolet curing reaction do.

The molding layer is composed of 100 parts by weight of an acrylic resin and 5 to 50 parts by weight of the photoreactive oligomer and 1 to 5 parts by weight of a photo initiator based on 100 parts by weight of the acrylic resin.

The photoreactive oligomer may be used singly or in combination of two or more kinds of oligomers having two functional groups, three functional groups, five functional groups, six functional groups, and ten functional groups, depending on the number of functional groups.

Wherein the bifunctional oligomer is selected from the group consisting of 1,6-hexanediol diacrylate, 1,4-butanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, triethylene glycol diacrylate, tricyclodecane dimethanol Diacrylate, < / RTI >

The trifunctional oligomer is selected from the group consisting of trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, and pentaerythritol triacrylate.

Wherein the pentafunctional oligomer is selected from the group consisting of pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate.

As the hexafunctional oligomer, dipentaerythritol hexaacrylate is used.

Miramer MU9500 is used as the above-mentioned 10-functional oligomer.

The photoinitiator may be selected from the group consisting of 2,4,6-trimethylbenzoyldiphenyldiphenylphosphine oxide, 4,4'-bisdiethylaminobenzophenone, phenylbis (2,4,6-trimethylbenzoyl) -phosphine oxide, Two or more of them may be used in combination.

The molding layer constituting the protective film according to the present invention is prepared by adding methacryloyloxyethyl isocyanate to an acrylic resin having a glass transition temperature not higher than room temperature and then adding a photoinitiator for initiating the ultraviolet curing reaction .

Such a molding layer is formed by mixing 100 parts by weight of an acrylic resin and 7 to 12 parts by weight of methacryloyloxyethyl isocyanate with respect to 100 parts by weight of the acrylic resin, and adding 1 to 5 parts by weight of a photoinitiator thereto.

The molding layer is preferably controlled in accordance with the thickness of the substrate layer, and the thickness thereof is preferably 20 to 200 mu m.

In addition, the base layer is selected from the group consisting of polyethylene terephthalate, polypropylene, unoriented polypropylene, polyurethane, and polyolefin.

As described above, according to the protective film for a mobile device having a self-bending function of the present invention, a molding layer capable of maintaining a shape deformed by ultraviolet curing is formed between a substrate layer and a pressure-sensitive adhesive layer, It is possible to easily adhere to the surface of the display and to maintain the adhesion state for a long time by molding the display layer so as to conform to the surface of the 3D display with the curvature through the curing reaction of the molding layer by a small amount of ultraviolet rays contained in visible light or illumination light, And the convenience of use can be improved.

1 is a view showing an attachment state of a protective film to a curved mobile device according to the present invention;
2 is a view showing the attachment state of a protective film to a conventional flat mobile device
3 is a view showing an attachment state of a protective film to a conventional curved mobile device

Hereinafter, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the technical idea of the present invention. The present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The protective film for a mobile device having a self-bending function according to the present invention is a film for protecting a display surface from an external impact and forming a molding layer between the base layer and the adhesive layer to maintain a deformed shape by ultraviolet curing Thereby forming and attaching the protective film to a shape conforming to the shape of the display surface having a curvature. Such a protective film is composed of a substrate layer made of a synthetic resin film and serving as a support, A hard coat layer bonded to one surface of the substrate layer to impart strength; A pressure-sensitive adhesive layer bonded to the other surface of the substrate layer to impart adhesive force; A molding layer formed between the substrate layer and the adhesive layer and cured by ultraviolet rays to be formed into a shape of a display surface; And a release film detachably attached to the adhesive layer.

The substrate layer is not particularly limited but may be formed of a material such as polyethylene terephthalate (PET), polypropylene (PP), cast polypropylene (CPP), polyurethane (PU), polyolefin PO) may be used. Depending on the type and thickness of the substrate layer, a thickness of the ultraviolet curable molding layer described later may be applied to 20 to 200 탆.

The hard coating layer is formed on one surface (surface) of the base layer in order to prevent the occurrence of scratches, stamping, etc. due to external friction or stimulation. The hard coating layer is formed by applying a hard coating solution having high surface hardness and durability and then curing , Acrylic resin, urethane resin, silicone resin, and the like.

The adhesive layer is formed on the other surface (back surface) of the base layer so as to be detachably attached to the surface of the display. The adhesive layer may be an acrylic adhesive, a silicone adhesive, or the like.

The base layer, the hard coating layer, the adhesive layer and the release film are well-known, and a detailed description thereof will be omitted.

Hereinafter, constituent components and a manufacturing method of the ultraviolet ray curable molding layer will be described in detail as characteristic components of the present invention.

First, a UV-curable molding layer is produced by two methods. [1] a method of adding a photoreactive oligomer capable of UV curing reaction to an acrylic resin, and [2] a method of adding an acrylic resin Methacryloyloxyethyl isocyanate (MOI) is mixed with the resin to perform chemical bonding.

This will be described in more detail as follows.

[1] Photoreactive oligomer addition

In this process, a general acrylic resin such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate and methyl methacrylate is synthesized by general condensation polymerization and addition polymerization, and an ultraviolet curing reaction And a photoinitiator for initiating an ultraviolet curing reaction are added to form a molding layer.

The acrylic resin used is a solvent-type acrylic resin having a glass transition temperature (Tg) of room temperature or less, in order to secure flexibility to be initially attached to a display surface having a curvature.

The photoreactive oligomers may be used singly or in combination of two or more kinds among oligomers having two functional groups, three functional groups, five functional groups, six functional groups and ten functional groups depending on the number of functional groups.

Examples of the bifunctional oligomer include 1,6-hexanediol diacrylate (HDDA), 1,4-butanediol diacrylate (BDDA), tripropylene glycol diacrylate Tripropylene Glycol Diacrylate (TPGDA), Dipropylene Glycol Diacrylate (DGD), Triethylene Glycol Diacrylate (TGD), Tricyclodecane dimethanol diacrylate (TCDDA) And the like.

Examples of the trifunctional oligomer include trimethylolpropane triacrylate (TMPTA), trimethylolpropane trimethacrylate (TMPTMA), and pentaerythritol triacrylate (PETA). .

Examples of the pentafunctional oligomer include pentaerythritol tetraacrylate (PETA) and di-pentaerythritol pentaacrylate (DPPA).

As the hexafunctional oligomer, dipentaerythritol hexaacrylate (DPHA) is used.

As the above-mentioned 10-functional oligomer, Miramer MU9500 (trade name of Miwon Specialty Chemical Co., Ltd.) which is an aliphatic multifunctional acrylate is used.

Such photoreactive oligomers are not necessarily limited to these.

In addition, the photoreactive oligomer may be varied in its kind and content depending on the number of functional groups. When the photoreactive oligomer is used in a small amount, however, the photoreactive oligomer may be lifted during molding due to ultraviolet curing of the protective film, And the visibility of the display may be lowered. Therefore, it is preferable to add 5 to 50 parts by weight based on 100 parts by weight of the acrylic resin.

The photoinitiator is used for absorbing energy from visible light or illumination light to initiate a polymerization reaction. Examples of such photoinitiators include a long-wavelength reaction type in which an initiation reaction can occur due to a small amount of ultraviolet light (mostly ultraviolet light of long wavelength) contained in visible light or illumination light The initiator, 2,4,6-trimethylbenzoyl-diphenyl-diphenyl phosphine oxide (TPO), 4,4'-bisdiethylaminobenzophenone (2,4,6-trimethylbenzoyl) -phosphine oxide (hereinafter referred to as " bis (diethylamino) benzophenone) And the amount thereof used is 1 to 5 parts by weight based on 100 parts by weight of the acrylic resin.

When the user removes the release film and then attaches to the surface of the display having a curvature, the protective film produced using the molding layer having the above-described structure is exposed to a small amount of ultraviolet rays contained in visible light (sunlight) The molding is performed in the same shape as the curved surface shape after the curing reaction of the molding layer is performed in a state of being attached to the surface curved surface. Even if a long time elapses after the attachment of the protective film 1 as shown in FIG. 1, ) Edge portions of the protective film do not protrude from the surface.

Next, the adhesion performance of the code film according to the present invention will be described in detail with reference to the following examples. However, the following examples are only for the purpose of helping understanding of the present invention, and the present invention is not limited thereto.

≪ Example 1 >

This example is to confirm the adhesion performance of the protective film produced according to the kind and content of the photoreactive oligomer.

First, a UV-curable molding layer was prepared by using a solvent-type acrylic resin having a glass transition temperature (Tg) of -33 占 폚, a weight average molecular weight (Mw) of about 800,000 g / mol and a solid content of 41% as a base resin, A bifunctional photoreactive oligomer, 1,6-hexanediol diacrylate (HDDA), a trifunctional photoreactive oligomer, trimethylolpropane triacrylate (TMPTA), a 6-functional photoreactive oligomer, dipentaerythritol Dipentaerythritol Hexaacrylate (DPHA) and Miramer MU9500 (trade name), a 10-functional photoreactive oligomer, were added according to the proportions shown in Table 1 below.

Also, trimethylbenzoyl-diphenyl-diphenyl phosphine (TPO) was used as a photoinitiator to initiate the reaction by ultraviolet rays.

A protective film sample was prepared using the ultraviolet curable molding layer having the above-described structure. A hard film-coated PET film having a thickness of 38 탆 was used as the substrate. The thickness of the ultraviolet ray hardening molding layer was 30 탆, , A pressure sensitive adhesive having an adhesive force of about 200 gf / in was formed to a thickness of 15 μm, and a protective film sample was obtained by laminating a release film on the back surface of the pressure sensitive adhesive layer.

The protective film obtained as described above was attached to a cover glass (size: 5.1 inch, curved surface R value: 3.3) for 3D display, and observed in a room with a fluorescent lamp.

According to the above Table 2, when the bifunctional oligomer was used alone, the protective film of the sample 1 having the added content of 40 phr was lifted from the curved surface, and the sample 2 with the added 50 phr was not adhered without lifting the protective film Respectively.

Samples 3 and 4 using trifunctional oligomers exerted lifting at 30 phr and good adhesion at 40 phr. In addition, samples 5 and 6 using 6-functional oligomer alone showed an addition amount of 10 phr And the adhesion was good at 20 phr.

In the case of samples 7 and 8 using the 10-functional oligomer alone, the adhesion of both samples was good, but it was expected that the sample 8 with 10 phr added had yellowing on the protective film and the visibility of the display screen would be lowered.

Further, in the case of samples 2, 4, 6, 7 and 8 having good adhesion without lifting the protective film, the protective film was removed from the display surface and the shape was confirmed. As a result, the protective film was molded in the same shape as the shape of the 3D display surface In case of samples 1, 3 and 5 in which lifting was occurred, it was found that the molding was not formed in the shape of the surface of the display or sufficient molding was not performed to prevent lifting.

Accordingly, when the photoreactive oligomer having a small number of functional groups is used, the content of the photoreactive oligomer should be increased. When the photoreactive oligomer having a large number of functional groups is used, a small amount of the photoreactive oligomer is favorably applied without lifting the protective film. The smaller the number is, the less the component that can be formed by the ultraviolet ray reaction is, and the restoring force of the PET film as the base layer can not be overcome. Also, in the case of the 10-functional photoreactive oligomer, when the addition amount is high, the reaction by the ultraviolet ray proceeds rapidly due to a large amount of the reactors, and thus the yellowing of the UV-curable molding layer is considered to have occurred.

As described above, according to Example 1, the moldability of the ultraviolet ray hardening type molding layer is increased as the number of functional groups or the addition amount of the photoreactive oligomer is increased.

≪ Example 2 >

This embodiment is for confirming the moldability of the ultraviolet ray hardening molding layer according to the thickness of the base layer.

The base layer such as the PET film has a difference in stiffness according to the thickness thereof, and therefore the lifting force (restoring force) of the protective film attached to the surface of the 3D display is different. That is, as the thickness of the PET film as the base layer becomes thicker, the restoring force of the protective film is further increased, and the moldability of the ultraviolet ray hardening type molding layer must be increased. Thus, The moldability of the molding layer was evaluated by varying the thickness of the molding layer.

A protective film sample was prepared in the same manner as in Example 1 except that the composition ratio of the ultraviolet curable molding layer was the same as that of the sample 6.

As shown in the following Table 3, a PET film having a thickness of 38 탆, 50 탆 and 75 탆 was applied as a substrate layer, and the thickness of the ultraviolet ray hardening molding layer was varied to 20 - 70 탆.

The protective film having the above thickness was attached to a cover glass for 3D display (size: 5.1 inch, curved surface R value: 3.3) and observed in a room with a fluorescent lamp.

According to Table 4, when a PET film having a thickness of 38 탆 is applied, a sample 9 having a thickness of 20 탆 of the ultraviolet ray hardening molding layer has a curved surface of the protective film, and the thickness of the molding layer is 30 탆 and 40 탆 The samples 10 and 11 having good adhesion without lifting.

In addition, when the PET film having a thickness of 50 탆 was applied, the sample 12 having the molding layer thickness of 40 탆 developed, but the samples 13 and 14 having the molding layer thickness of 50 탆 and 60 탆 had no entanglement, In the case of the PET film thickness of 75 탆, the samples 15 and 16 having the molding layer thicknesses of 50 탆 and 60 탆 produced exfoliation but the sample 17 having the molding layer thickness of 70 탆 had good adhesion.

As the thickness of the PET film as the base layer increases, the thickness of the ultraviolet curable molding layer, which is a molding layer, also increases, so that the curved surface of the protective film shows good adhesion performance.

That is, as the thickness of the PET film increases, the stiffness increases, so that the protective film attached to the curved surface is exaggerated to increase the force to be restored. Therefore, the moldability of the ultraviolet curable molding layer must be increased more than the restoring force of the PET film. The increase in thickness could be solved.

[2] Synthesis of acrylic resin using MOI

Acrylic resin was synthesized by polymerization reaction using methacryloyloxyethyl isocyanate (MOI) to introduce ethylenic unsaturation into the polymer chain to synthesize an integrated acrylic pressure-sensitive adhesive capable of ultraviolet curing, Are mixed to constitute an ultraviolet curable molding layer.

That is, in the process of synthesizing an acrylic resin, the MOI is mixed with 7 to 12 parts by weight based on 100 parts by weight of an acrylic resin, and then a photoinitiator is mixed to obtain a molding layer.

At this time, it is preferable that the acrylic resin is synthesized so as to have a glass transition temperature of room temperature or lower in order to secure flexibility to be initially attached to the curved display surface as in the step [1].

In addition, when the MOI is low when the acrylic resin is synthesized, lifting of the protective film occurs due to ultraviolet curing. On the other hand, when the acrylic resin is excessively used, yellowing may occur and the visibility of the display may deteriorate. Preferably 7 to 12 parts by weight based on 100 parts by weight.

The photoinitiator is used in the same manner as the process of [1] above.

 ≪ Example 3 >

The present example is to confirm the adhesion of the protective film made using the acrylic resin synthesized with various MOI contents to the 3D display surface.

A protective film sample was prepared in the same manner as in Example 1 except that the content of MOI in the ultraviolet ray hardening type molding layer was varied from 4 to 10% as shown in Table 5, and the glass transition temperature (Tg) A monolithic acrylic resin with a molecular weight (Mw) of about 700,000 g / mol and a solids content of 35% and a UV-curing reaction was used. Also, trimethylbenzoyldiphenyldiphenylphosphine (TPO) was used as a photoinitiator that initiates the reaction by ultraviolet light.

The protective film obtained by synthesizing the acrylic resin having the MOI content as described above was attached to a cover glass (size: 5.1 inch, curved surface R value: 3.3) for 3D display and observed in a room with a fluorescent lamp, 6.

According to Table 6, in the case of Samples 18 and 19 in which the acrylic resin having MOI content of 4% and 6% was applied, the curved surface portion of the protective film was lifted while the acrylic resin having MOI content of 8% and 10% The samples 20 and 21 which were applied were found to have good adhesion without lifting.

This is because, when an acrylic resin having a low MOI content is used as in Example 1, there is a lack of components that can be molded in response to ultraviolet rays, so that lifting occurs at a bent portion. As compared with the restoring force of a PET film, It is preferable that the MOI content of the sample 20 is about 8% or more.

<Example 4>

The present example is for confirming the moldability of the ultraviolet curable molding layer depending on the thickness of the base layer, and the moldability of the molding layer was evaluated by varying the thickness of the molding layer.

A protective film sample was prepared in the same manner as in Example 1 except that the composition ratio of the ultraviolet ray hardening type molding layer was the same as that of the sample 20 and as shown in Table 7 below, PET having a thickness of 38, 50, The film was applied as a base layer, whereby the thickness of the UV-curable molding layer was varied from 20 to 70 μm.

The results of the adhesion test observed in a room with a fluorescent lamp after attaching a protective film having the above thickness to a cover glass (size: 5.1 inch, curved surface R value: 3.3) for 3D display are shown in Table 8 .

According to Table 8, when the PET film having a thickness of 38 탆 was applied, the sample 22 having the thickness of the ultraviolet curable molding layer of 20 탆 had a curved surface of the protective film, and the thickness of the molding layer was 30 탆 and 40 탆 The samples 23 and 24 were good in adhesion without lifting.

When a PET film having a thickness of 50 탆 was applied, a sample 25 having a thickness of 40 탆 of the ultraviolet ray hardening molding layer was lifted. However, the samples 26 and 27 having a molding layer thickness of 50 탆 and 60 탆, When the thickness of the PET film was 75 탆, the samples 28 and 29 having the molding layer thicknesses of 50 탆 and 60 탆 produced exfoliation, while the samples 30 having the molding layer thickness of 70 탆 had good adhesion.

As in the case of Example 2, it was found that the thickness of the UV-curable molding layer, which is the molding layer, increases as the thickness of the PET film as the base layer increases, so that the curved surface of the protective film exhibits good adhesion performance.

1: Protective film D: Display

Claims (14)

A substrate layer made of a synthetic resin film and serving as a support;
A hard coat layer formed on the surface of the substrate layer to impart strength;
An adhesive layer disposed on the back surface of the substrate layer and imparting adhesive force to the substrate layer so as to adhere to the surface of the display;
A molding layer formed between the base layer and the adhesive layer and cured by ultraviolet rays to conform to the surface shape of the display; And
And a release film detachably attached to the back surface of the adhesive layer,
Wherein the molding layer is formed by mixing an acrylic resin having a glass transition temperature not higher than room temperature and a photoreactive oligomer capable of performing an ultraviolet curing reaction and a photoinitiator for initiating an ultraviolet curing reaction. Protective film for mobile devices with. delete The method according to claim 1,
Wherein the molding layer comprises 100 parts by weight of an acrylic resin and 5 to 50 parts by weight of the photoreactive oligomer and 1 to 5 parts by weight of a photoinitiator per 100 parts by weight of the acrylic resin. . The method of claim 3,
Characterized in that the photoreactive oligomer is used alone or in admixture of two or more kinds of oligomers having a bifunctional, trifunctional, bifunctional, hexafunctional, and 10-functional oligomers depending on the number of functional groups. 5. The method of claim 4,
Wherein the bifunctional oligomer is selected from the group consisting of 1,6-hexanediol diacrylate, 1,4-butanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, triethylene glycol diacrylate, tricyclodecane dimethanol Diacrylate. &Lt; RTI ID = 0.0 &gt; 15. &lt; / RTI &gt; 5. The method of claim 4,
Wherein the trifunctional oligomer is selected from the group consisting of trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, and a self-bending function protective film for mobile devices. 5. The method of claim 4,
Wherein the pentafunctional oligomer is selected from the group consisting of pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, and the self-bending function protective film for mobile devices. 5. The method of claim 4,
Wherein the hexafunctional oligomer is dipentaerythritol hexaacrylate. 6. A protective film for a mobile device having a self-bending function. 5. The method of claim 4,
The protective film for a mobile device having a self-bending function, wherein the 10-functional oligomer is Miramer MU9500. The method of claim 3,
The photoinitiator may be selected from the group consisting of 2,4,6-trimethylbenzoyldiphenyldiphenylphosphine oxide, 4,4'-bisdiethylaminobenzophenone, phenylbis (2,4,6-trimethylbenzoyl) -phosphine oxide, A protective film for a mobile device. A substrate layer made of a synthetic resin film and serving as a support;
A hard coat layer formed on the surface of the substrate layer to impart strength;
An adhesive layer disposed on the back surface of the substrate layer and imparting adhesive force to the substrate layer so as to adhere to the surface of the display;
A molding layer formed between the base layer and the adhesive layer and cured by ultraviolet rays to conform to the surface shape of the display; And
And a release film detachably attached to the back surface of the adhesive layer,
Wherein the molding layer is formed by adding methacryloyloxyethyl isocyanate to an acrylic resin having a glass transition temperature not higher than room temperature and synthesizing a photoinitiator for initiating an ultraviolet curing reaction. Protective film for mobile devices. 12. The method of claim 11,
Wherein the molding layer is formed by mixing 100 parts by weight of an acrylic resin and 7 to 12 parts by weight of methacryloyloxyethyl isocyanate with respect to 100 parts by weight of the acrylic resin and adding 1 to 5 parts by weight of a photoinitiator thereto. Protective film for mobile devices with self-bending function. The method according to any one of claims 1, 3, 11, or 12,
Wherein the molding layer has a thickness of 20 to 200 占 퐉. The method according to claim 1 or 11,
Wherein the base layer is selected from the group consisting of polyethylene terephthalate, polypropylene, unoriented polypropylene, polyurethane, and polyolefin.

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