KR101908026B1 - Protection film for display - Google Patents

Abstract

The present invention relates to a display protective film, and more particularly, to a display protective film, which has excellent antifouling and properties, does not make air bubbles when adhering to the adherend surface, and since an adhesive does not exist on the adherend surface during peeling, the re-workability is excellent, and at the same time, lifting phenomenon and delamination phenomenon are not caused when adhering to a curved surface.

Description

Display protective film {Protection film for display}

More particularly, the present invention relates to a display protective film which is excellent in antifouling property and antistatic function, does not generate bubbles when adhered to a surface to be adhered, does not remain on the adherend surface during peeling, And at the same time, a display protective film which does not cause lifting phenomenon and delamination when adhering to a curved surface.

In general, a portable electronic device having a display such as a smart phone, a tablet PC, and the like attaches a transparent protective film to the display to prevent damage and contamination of the display.

Such a protective film is generally sold with the release film portion and the cover film portion being temporarily attached to the attachment surface and the exposed surface of the main film portion attached to the liquid crystal screen of the portable electronic device, and the user removes the release film portion and the cover film portion The rear main film portion is positioned and attached to the liquid crystal screen of the portable electronic device.

However, when attaching the protective film to the liquid crystal screen, it is very difficult to accurately place the protective film on the liquid crystal screen so that the protective film is aligned with the liquid crystal screen in most cases. Therefore, The protective film may be damaged due to fingerprints or fingerprints, and bubbles may be formed between the liquid crystal screen and the protective film. In this case, ≪ / RTI >

In the prior art, there is a structure for fixing one side of the protective film so that the protective film can be more easily attached to the liquid crystal screen by recognizing such a problem. However, it is difficult to accurately attach the protective film to the liquid crystal screen, .

Therefore, it is excellent in antifouling property and antistatic function, and bubbles are not generated when adhered to the adherend surface, and since the adhesive does not remain on the adherend surface during peeling, reworkability is excellent, Research on display protective film that does not cause development is urgent.

KR 10-1257477B1

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide an antifouling coating composition which is excellent in antifouling property and antistatic function and which does not generate bubbles when adhered to a surface to be adhered, And a display protective film which does not cause lifting phenomenon and interlayer delamination when it is attached to a curved surface.

In order to solve the above-described problems, the present invention provides an adhesive layer for photocuring to form an adhesive layer; And a pressure-sensitive adhesive layer formed on a lower portion of the adhesive layer, wherein the adhesive layer and the adhesive layer both satisfy the following conditions (1) and (2) Thereby providing a protective film.

(1) | Tg ₁ - Tg ₂ | ≥ 63

≤ 170임.(2)

≪ / RTI >

Here, Tg ₁ is the glass transition temperature (° C) of the adhesive layer, and Tg ₂ is the glass transition temperature (° C) of the adhesive layer.

According to an embodiment of the present invention, the adhesive layer may have a glass transition temperature of -5 to 35 ° C, and the adhesive layer may have a glass transition temperature of 60 to 150 ° C.

Further, it may further comprise an upper protective layer formed on the adhesive layer.

The adhesive layer may further include a primer layer formed on at least one side of the adhesive layer.

In addition, the thickness of the adhesive layer may be 5 to 55 탆, and the thickness of the adhesive layer may be 20 to 110 탆.

The upper protective layer may have a thickness of 0.03 to 13 mu m.

The primer layer may have a thickness of 1 to 15 탆.

The adhesive layer may contain 0.3 to 5 parts by weight of a photoinitiator per 100 parts by weight of the main resin.

The resin may include at least one selected from the group consisting of a urethane resin, an acrylate resin, a urethane-acrylate resin, an epoxy acrylate, and a polyester acrylate.

Also, the photoinitiator may include at least one selected from the group consisting of a first photoinitiator including a compound represented by the following Formula 1 and a second photoinitiator comprising a hydroxyketone.

[Chemical Formula 1]

Wherein R ¹ , R ² and R ³ are each independently a hydrogen atom or a C ₁ to C ₅ alkyl group, R ⁴ is a hydrogen atom or a C ₁ to C ₅ alkyl group or a C ₄ or more alicyclic alkyl group or C ₆ or more aryl group.

Also, the photoinitiator may include the first photoinitiator and the second photoinitiator in a weight ratio of 1: 0.5 ~ 2.

The adhesive layer may include a silicon-based pressure-sensitive adhesive.

Also, at least one side of the upper protective layer may be subjected to electrification treatment.

In addition, at least one side of the upper protective layer may be treated with antifouling treatment.

The adhesive layer may further include an upper release film on the adhesive layer, and a lower release film on the lower side of the adhesive layer.

The upper release film may have a thickness of 4.5 to 75 탆, and the lower release film may have a thickness of 7 to 100 탆.

The display protective film of the present invention is excellent in anti-fouling characteristics and antistatic function, and does not generate bubbles when adhered to the adherend surface. Since the adhesive does not remain on the adherend surface during peeling, There is an effect that no lifting phenomenon and delamination between layers occur.

1 to 5 are sectional views of a display protective film according to an embodiment of the present invention, and Figs.
6 is a cross-sectional view of a display protective film after curing according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

1, the display protective film 100 of the present invention includes an adhesive layer 110 for forming an adhesive layer by photocuring and an adhesive layer 120 formed under the adhesive layer, But does not include a support film when applied to a display after an adhesive layer is formed.

As described above, the display protective film 100 according to the present invention does not include the support film in the display protective film 100 when applied to the display after the adhesive layer is formed. As shown in FIG. 6, the cured display protective film 101 may include at least one curved portion formed at a predetermined distance from at least one end of the curved portion. Curl control effect.

The support film refers to a film which serves to support the protective film from the uncured protective film until the protective film in the cured state is applied to the display and includes an upper release film for protecting the upper and lower portions of the protective film, And a film different from the film to be removed when applied to a display, such as a lower release film.

Meanwhile, the display protective film 100 according to the present invention can be applied to a display having a curved shape by including at least one curved portion formed at a predetermined distance from at least one end portion after curing. In addition, when applied to a display having a curved shape compared to a display protective film not including a curvature portion, the occurrence of floating phenomenon may be considerably deteriorated.

First, the adhesive layer 110 for photo-curing to form an adhesive layer will be described.

The adhesive layer adheres to the adhesive layer 120 and attaches the upper protective layer 130 and the adhesive layer 120 when the upper protective layer 130 is included.

The adhesive layer 110 and the adhesive layer both satisfy the following conditions (1) and (2).

≤ 170, 바람직하게는

≤ 155일 수 있다.As the condition (1), | Tg ₁ - Tg ₂ | Gt; 63, preferably < RTI ID = 0.0 > Tg ₁ - Tg ₂ | ≫ = 66, and under condition (2)

Lt; = 170, preferably

≪ / RTI >

Here, Tg ₁ is the glass transition temperature (° C) of the adhesive layer, and Tg ₂ is the glass transition temperature (° C) of the adhesive layer.

이 170을 초과하면 디스플레이 보호필름(100) 제조 중 기포제거가 용이하지 않거나, 곡률부에 들뜸현상이 발생할 수 있다.If the condition (1) | If Tg ₁ - Tg ₂ | is less than 63, lifting of the display protective film 100 may occur during manufacture of the display protective film 100, or lifting due to thermal shrinkage and expansion may occur during reliability evaluation of the manufactured display protective film 100. Further, in the condition (2)

If it exceeds 170, bubbles may not easily be removed during manufacture of the display protective film 100, or floating may occur in the curvature portion.

On the other hand, the adhesive layer 110 may have a glass transition temperature (Tg ₁ ) of -5 to 35 ° C, preferably -3 to 33 ° C, so that the conditions (1) and (2) If the glass transition temperature of the adhesive layer is less than -5 DEG C, bubbling may not be easily performed during the manufacture of the display protective film 100, and if the glass transition temperature is more than 35 DEG C, lifting of the display protective film 100 may occur .

The adhesive layer may have a glass transition temperature (Tg ₂ ) of 60 to 150 캜, preferably 63 to 148 캜, so as to simultaneously satisfy the above-mentioned conditions (1) and (2). If the glass transition temperature of the adhesive layer is less than 60 캜, lifting due to heat shrinkage and expansion may occur during reliability evaluation, and if it exceeds 150 캜, lifting may occur in the curvature portion.

The adhesive layer 110 may have a thickness of 20 to 110 mu m, and preferably a thickness of 30 to 100 mu m. If the thickness of the adhesive layer 110 does not satisfy the above range, restoration due to the restoring force of the curvature portion can not be prevented.

Meanwhile, the adhesive layer may be formed by curing the adhesive layer 110 including a main resin and a photoinitiator.

The main resin included in the adhesive layer is not particularly limited as long as it is a material which can be used usually as a resin. Preferably, the resin is composed of a urethane resin, an acrylate resin, a urethane-acrylate resin, an epoxy acrylate and a polyester acrylate And the like.

The photoinitiator contained in the adhesive layer functions to react with the resin to form an adhesive layer upon UV irradiation.

The adhesive layer may contain 0.3 to 5 parts by weight, preferably 0.5 to 3.1 parts by weight, of a photoinitiator per 100 parts by weight of the main resin. If the adhesive layer is provided with less than 0.3 part by weight of the photoinitiator based on 100 parts by weight of the main resin, lifting and / or delamination that may occur due to the restoring force of the curvature portion can not be prevented. In addition, if the adhesive layer is provided with more than 5 parts by weight of the photoinitiator based on 100 parts by weight of the main resin, yellowing may occur, and heat resistance may be poor, resulting in lifting or delamination.

Meanwhile, the photoinitiator may include at least one selected from the group consisting of a first photoinitiator and a second photoinitiator.

The first photoinitiator may include a compound represented by formula (1).

[Chemical Formula 1]

Wherein R ¹ , R ² and R ³ are each independently a hydrogen atom or a C ₁ to C ₅ alkyl group, preferably R ¹ , R ² and R ³ are each independently a hydrogen atom or C ₁ to C ₃ R ⁴ is a hydrogen atom or a C ₁ to C ₅ alkyl group or a C ₄ or more alicyclic alkyl group or a C ₆ or more aryl group, preferably R ⁴ is a hydrogen atom or a C ₁ to C ₃ alkyl group Or a C ₅ or more alicyclic alkyl group or a C ₆ or more aryl group.

In addition, the second photoinitiator may include at least one member selected from the group consisting of acetone, acetone, and benzoin.

According to an embodiment of the present invention, the photoinitiator may include the first photoinitiator and the second photoinitiator at a weight ratio of 1: 0.5 to 2, preferably 1: 0.7 to 1.5. If the first photoinitiator and the second photoinitiator are contained in a weight ratio of less than 1: 0.5, the surface of the adhesive layer 110 may be uncured. If the weight ratio of the first and second photoinitiators is more than 1: 2, ) May have an uncured portion inside thereof.

Next, the adhesive layer 120 formed below the adhesive layer 110 will be described.

The adhesive layer 120 functions to attach the display and the display protective film 110 directly to the display.

The adhesive layer 120 may be any material that can be used in the adhesive layer 120 of the display protection film 100 in the art. Preferably, the adhesive layer 120 includes an adhesive layer 120 The bubbles are not generated when adhered to the adherend surface, the adhesive can not remain on the adherend surface during peeling, and the re-workability can be excellent, so that the interlayer peeling phenomenon in the display protective film 100 does not occur .

In addition, the thickness of the adhesive layer 120 may be 5 to 55 μm, preferably 10 to 50 μm. If the thickness of the adhesive layer 120 does not satisfy the above range, restoration due to the restoring force of the curvature portion can not be prevented. Therefore, (100) may be peeled off.

The display protective film 100 according to the present invention may further include an upper protective layer 130 formed on the adhesive layer 110 as shown in FIG.

The upper protective layer 130 functions to prevent contamination of the display and to prevent electrification and substantially protect the display.

The upper protective layer 130 may be any material that can be used for a display protective film in the art, and preferably a composition including an acrylate resin may be formed by ultraviolet light, . Since the hardness of the upper protective layer 130 can be controlled and the hardness of the upper protective layer 130 can be changed according to the use or shape of the display to be protected, I never do that.

On the other hand, the upper protective layer 130 may be subjected to antistatic treatment and / or antifouling treatment on at least one side, preferably the upper side. Antistatic treatment and / or antifouling treatment can prevent static electricity generation and contamination of the display and display protective film.

The upper protective layer 130 may have a thickness of 0.03 to 13 탆, and preferably a thickness of 0.1 to 10 탆. If the thickness of the upper protective layer 130 does not satisfy the above range, the restoration due to the restoring force of the curvature portion can not be prevented. Therefore, there may arise a problem that the lifting phenomenon occurs when the curvature portion is attached, Damage can not be prevented, and static electricity and contamination can not be prevented.

The display protective film 100 according to the present invention may further include a primer layer 140, 141, 142 formed on at least one surface of the adhesive layer 110 as shown in FIGS. 3 to 5 have.

The primer layers 140, 141, and 142 function to reinforce the adhesive force of the adhesive layer 110 described above.

The primer layers 140, 141, and 142 may be any materials that can be used in the display protective film in the art. Preferably, the primer layers 140, 141, and 142 may be formed of a primer layer 140, Layers 140, 141, and 142, respectively.

The primer layers 140, 141 and 142 may have a thickness of 1 to 15 탆, preferably 2 to 10 탆. If the thickness of the primer layer 140, 141, or 142 does not satisfy the above range, the interfacial adhesion may be lowered to cause delamination, and the solvent resistance may be weakened.

3, the primer layers 140, 141, and 142 are stacked in this order on the upper protective layer 130, the adhesive layer 110, the primer layer 140, and the adhesive layer 120, As shown in FIG. 4, the adhesive layer 110, the primer layer 140, and the adhesive layer 120 may be stacked in the order of the adhesive layer 110, the adhesive layer 120, The primer layer 141, the adhesion layer 110, the primer layer 142, the adhesive layer 120, and the lower release film 150 may be stacked in this order from the top, .

5, the display protection film 100 according to the present invention may further include an upper release film 160 on the adhesive layer 110 as shown in FIG. 5, And a lower release film 150 on the lower side.

The upper release film 160 may be any material that can be used in the display protective film in the art, and may be a PET material.

In addition, the upper release film 160 may have a thickness of 4.5 to 75 탆, preferably 12 to 75 탆. If the thickness of the upper release film 160 does not satisfy the above range, the bubble removing performance may be remarkably deteriorated or the adhesive layer may not be cured to a desired level.

When the upper protective film 160 is included, the upper protective film 160 may be removed and UV exposure may be performed when the adhesive layer 110 is photo-cured. Alternatively, the upper protective film 160 may be removed It is possible to perform UV exposure. For example, when performing the UV exposure without removing the upper protective film 160, the upper protective film 160 may preferably have a thickness of 4.5 to 25 占 퐉.

The lower release film 150 protects the adhesive layer 120, which is in direct contact with the display. The lower release film 150 may be any material that can be used as a lower release film of a display protective film in the art, and may be a PET material.

On the other hand, at least one side of the lower release film 150 may be treated with fluorine. By including the lower release film 150 that has undergone the fluorine release treatment, a releasing force of a level sufficiently smaller than the adhesive force of the adhesive layer 120 can be exhibited. Accordingly, when releasing the release layer upon adhering to the display , It is possible to prevent delamination in the display protective film 100.

In addition, the lower release film 150 may have a thickness of 7 to 100 탆, preferably 12 to 75 탆. If the thickness of the lower release film 150 is less than 7 mu m, the release film may penetrate into the adhesive layer 120 when stored in a roll state to cause deformation of the adhesive layer 120. If the thickness is more than 100 mu m, The workability may be deteriorated.

On the other hand, the display protective film of the present invention is excellent in antifouling property and antistatic function, and does not generate bubbles when adhered to the adherend surface, and does not remain on the adherend surface during peeling, It is possible to prevent the floating phenomenon and the delamination phenomenon from occurring.

The present invention will now be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Example 1 >

A laminate having an upper protective layer, a primer layer, an adhesive layer, a primer layer and an adhesive layer laminated in this order was produced.

Specifically, 2 parts by weight of a fluorine-based additive (Optu-DAC-HP, manufactured by Daito KK) and 3 parts by weight of an antistatic agent (manufactured by SUNABA SUDA Co., Ltd.) were added to 100 parts by weight of a urethane acryl lake- -GL57, hexagen) was added to form an upper protective layer having a thickness of 5 mu m having antistatic and anti-fouling processing functions, and 10 parts by weight of the curing agent (TR) was added to 100 parts by weight of a thermosetting acrylic resin (AA960-60, (KY-11, Negami) and a second urethane-acrylate resin (UN954, Negami) were mixed and treated to prepare a primer layer having a thickness of 2 탆. As a first photoinitiator, 0.75 part by weight of a compound represented by the following formula (1), and TPO (2,4,6-trimethylbenzoyldiphenyl-Phosphine oxide) as a first photoinitiator were added to 100 parts by weight of a main resin, 0.80 parts by weight, and 0.75 parts by weight. A primer layer having a thickness of 5 탆 was formed with a plastic resin (ESTIN 5778, lubrizol), 68 parts by weight of a first silicon based tackifier (4580, Dow coating) and a second silicon based tackifier (7637, (7028, Daew Coating) 1.5 parts by weight and a fourth silicon based pressure-sensitive adhesive (NC25, Daou coating) were mixed and treated to form a pressure-sensitive adhesive layer having a thickness of 30 탆 to prepare a laminate.

[Chemical Formula 1]

In Formula 1, R ¹ , R ^2, and R ³ are each independently a methyl group, and R ⁴ is a benzyl group.

≪ Examples 2 to 9, Examples 14 to 16 and Comparative Examples 1 and 2 >

A laminate as shown in Tables 1 to 4 was prepared by changing the glass transition temperature of the adhesive layer and the adhesive layer, the content of the photoinitiator, the lamination structure, and the like.

≪ Comparative Example 3 &

100 parts by weight of an acrylic resin (BURIM CHEMICAL, BA-1950RX) was mixed with 100 parts by weight of toluene, and the mixture was treated to prepare a laminate.

<Experimental Example 1>

The lower surface of the adhesive layer of the laminate prepared in Example and Comparative Example was brought into contact with the upper surface of the display on which the curved portions were formed so that both side ends faced downward and fixed so as to have a shape corresponding to the display.

1. Evaluation of laminate bubble removal

Bubble removal was evaluated on the laminate according to the fixed and comparative examples.

Specifically, when air bubbles generated between the laminate and the display according to the examples and the comparative examples were removed using a plunger and the air bubbles remaining between the laminate and the display were less than 1% of the total area, , ◯ when the total area is less than 1.5% and less than 1.5% of the total area, ∘ when the total area is less than 2%, △ when the total area is less than 2%, and × when the total area is not less than 2% Respectively.

2. Evaluation of stacking phenomenon

The lifting phenomenon was evaluated for the laminate according to the fixed and comparative examples.

Specifically, when the laminate according to the examples and the comparative examples were adhered and fixed, and both side ends of the laminate were not peeled off from the display after 12 hours at room temperature, - &gt; , And the lift-off phenomenon of the laminate was evaluated and shown in Tables 1 to 4 below.

<Experimental Example 2>

The laminated body according to the fixed and comparative examples was irradiated with UV light to photo-cure the adhesive layer to form an adhesive layer, thereby producing a display protective film.

1. Evaluation of protective film foaming

Bubble generation was evaluated for the display protective films prepared according to Examples and Comparative Examples.

Specifically, when the area of the bubble between the display protective film and the display area is less than 1% of the total area - ⊚, 1% or more of the total area is less than 1.5% - ○, 1.5% or more of the total area is less than 2% -, and when the total area is 2% or more, - x, the occurrence of bubbles is evaluated and shown in Tables 1 to 6 below.

2. Evaluation of lifting of protective film

The lift-off phenomenon was evaluated with respect to the display protective film produced according to Examples and Comparative Examples.

Specifically, after 12 hours at room temperature, the display protective films according to Examples and Comparative Examples in which an adhesive layer was formed through photo-curing were allowed to stand for 100 hours under conditions of a temperature of 60 ° C and a humidity of 90% The results are shown in Tables 1 to 4 below, in which the peeling is not peeled from the display at all, and the peeled at least one side is peeled from the display.

3. Evaluation of interlaminar peeling of protective film

For the display protective films produced according to Examples and Comparative Examples, the delamination was evaluated.

Specifically, after 12 hours at room temperature, the display protective film according to the example and the comparative example in which the adhesive layer was formed through photo-curing was allowed to stand for 100 hours under the conditions of a temperature of 60 ° C and a humidity of 90% - &amp; cir &amp; &amp; cir &amp; in the case where delamination did not occur in the case where delamination occurred even in the even layer, and the results are shown in Tables 1 to 4 below.

4. Evaluation of protective film reworkability

The re-workability of the display protective films prepared according to Examples and Comparative Examples was evaluated.

Specifically, when the pressure-sensitive adhesive layer remaining on the glass surface was peeled off after 12 hours from the display protective film according to the examples and the comparative example in which the adhesive layer was formed through photo-curing, % When the amount is less than 1% - ◯, when 1% or more is less than 1.5% - △, when the amount is 2% or more, - ×. The reworkability is evaluated and shown in Tables 1 to 4 below.

division Example
One Example
2 Example
3 Example
4 Example
5 Example
6 rescue The upper protective layer ○ ○ ○ ○ ○ ○ Primer layer ○ ○ ○ ○ ○ ○ (A) Adhesive layer ○ ○ ○ ○ ○ ○ Primer layer ○ ○ ○ ○ ○ ○ Adhesive layer ○ ○ ○ ○ ○ ○ Whether the support film is included × × × × × × The first and second urethane-acrylate resin weight ratios 5: 5 1: 9 3: 7 7: 3 5: 5 9: 1 (Tg ₁ , &lt; RTI ID = 0.0 &gt; C) &lt; 10 -3 5 16 10 33 Adhesive layer glass transition temperature (Tg ₂ , ° C) 99 63 91 104 99 148 Condition (1) | Tg ₁ - Tg ₂ | 89 66 86 88 89 115 Condition (2) (Tg ₁ ² + Tg ₂ ² ) ^1/2 99.5 63.1 91.1 105.22 99.5 151.6 Photoinitiator The content of the first photoinitiator (parts by weight) 1.5 1.5 1.5 1.5 0.2 1.5 The laminate Degassing Evaluation ◎ ○ ◎ ◎ ◎ ○ Assessing the Phenomenon ○ ○ ○ ○ ○ ○ Protective film Evaluation of bubble generation ◎ ◎ ◎ ◎ ◎ ◎ Evaluation of lifting phenomenon ○ ○ ○ ○ × ○ Delamination evaluation ○ ○ ○ ○ × ○ Reworkability evaluation ◎ ◎ ◎ ◎ ◎ ◎

division Example
7 Example
8 Example
9 rescue The upper protective layer ○ ○ ○ Primer layer ○ ○ ○ (A) Adhesive layer ○ ○ ○ Primer layer ○ ○ ○ Adhesive layer ○ ○ ○ Whether the support film is included × × × The first and second urethane-acrylate resin weight ratios 5: 5 5: 5 5: 5 (Tg ₁ , &lt; RTI ID = 0.0 &gt; C) &lt; 10 10 10 Adhesive layer glass transition temperature (Tg ₂ , ° C) 99 99 99 Condition (1) | Tg ₁ - Tg ₂ | 89 89 89 Condition (2) (Tg ₁ ² + Tg ₂ ² ) ^1/2 99.5 99.5 99.5 Photoinitiator The content of the first photoinitiator (parts by weight) 0.5 3.1 7 The laminate Degassing Evaluation ◎ ◎ ◎ Assessing the Phenomenon ○ ○ ○ Protective film Evaluation of bubble generation ◎ ◎ ◎ Evaluation of lifting phenomenon ○ ○ × Delamination evaluation ○ ○ × Reworkability evaluation ○ ○ ◎

division Example
14 Example
15 Example
16 rescue The upper protective layer ○ ○ - Primer layer - - - (A) Adhesive layer ○ ○ ○ Primer layer ○ - ○ Adhesive layer ○ ○ ○ Whether the support film is included × × × The first and second urethane-acrylate resin weight ratios 5: 5 5: 5 5: 5 (Tg ₁ , &lt; RTI ID = 0.0 &gt; C) &lt; 10 10 10 Adhesive layer glass transition temperature (Tg ₂ , ° C) 99 99 99 Condition (1) | Tg ₁ - Tg ₂ | 89 89 89 Condition (2) (Tg ₁ ² + Tg ₂ ² ) ^1/2 99.5 99.5 99.5 Photoinitiator The content of the first photoinitiator (parts by weight) 1.5 1.5 1.5 The laminate Degassing Evaluation ◎ ◎ ◎ Assessing the Phenomenon ○ ○ ○ Protective film Evaluation of bubble generation ◎ ◎ ◎ Evaluation of lifting phenomenon ○ ○ ○ Delamination evaluation ○ ○ ○ Reworkability evaluation ◎ ◎ ◎

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 rescue The upper protective layer ○ ○ ○ ○ ○ Primer layer ○ ○ ○ ○ ○ (A) Adhesive layer ○ - ○ ○ ○ Primer layer ○ - ○ ○ ○ Adhesive layer ○ ○ ○ (Other) ¹⁾ ○ ○ Whether the support film is included ○ × × × × The first and second urethane-acrylate resin weight ratios 5: 5 - 5: 5 Second
Exclusive 1st
Exclusive (Tg ₁ , &lt; RTI ID = 0.0 &gt; C) &lt; 10 - 10 -10 40 Adhesive layer glass transition temperature (Tg ₂ , ° C) 99 - 99 50 190 Condition (1) | Tg ₁ - Tg ₂ | 89 - 89 60 150 Condition (2) (Tg ₁ ² + Tg ₂ ² ) ^1/2 99.5 - 99.5 51 194.2 Photoinitiator The content of the first photoinitiator (parts by weight) 1.5 - 1.5 1.5 1.5 The laminate Degassing Evaluation ◎ ◎ △ △ △ Assessing the Phenomenon × × ○ × × Protective film Evaluation of bubble generation ◎ ◎ ◎ ◎ ◎ Evaluation of lifting phenomenon × × ○ × × Delamination evaluation ○ × × ○ ○ Reworkability evaluation ○ △ × ○ ○ 1) In Comparative Example 3, the adhesive layer of the other type shows that the pressure sensitive adhesive layer was changed from the silicon pressure sensitive adhesive to the acrylic pressure sensitive adhesive.

As can be seen from Tables 1 to 4 above,

The laminate according to the present invention, which satisfies both the adhesive layer and the adhesive layer according to the present invention and satisfies both the glass transition temperature of the adhesive layer, the content of the photoinitiator, the laminate structure and the composition of the adhesive layer, is excellent in bubble removal, It was confirmed that the display protective film according to the present invention does not generate bubbles, does not cause lifting phenomenon and delamination, and exhibits an excellent reworkability.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: display protective film 110: adhesive layer
120: adhesive layer 130: upper protective layer
140, 141, 142: primer layer 150: lower release film
160: Upper release film

Claims (16)

An upper protective layer;
An adhesive layer formed under the upper protective layer and photo-cured to form an adhesive layer; And
And an adhesive layer formed below the adhesive layer
The adhesive layer and the adhesive layer both satisfy the following conditions (1) and (2)
Display protective film without support film:
(1) | Tg ₁ - Tg ₂ | ≥ 63
(2)

≤ 170
Here, Tg ₁ is the glass transition temperature (° C) of the adhesive layer, and Tg ₂ is the glass transition temperature (° C) of the adhesive layer. The method according to claim 1,
The adhesive layer has a glass transition temperature of -5 to 35 占 폚,
Wherein the adhesive layer has a glass transition temperature of 60 to 150 占 폚. delete The method according to claim 1,
And a primer layer formed on at least one side of the adhesive layer. The method according to claim 1,
The adhesive layer has a thickness of 5 to 55 탆,
Wherein the adhesive layer has a thickness of 20 to 110 占 퐉. The method according to claim 1,
Wherein the upper protective layer has a thickness of 0.03 to 13 占 퐉. 5. The method of claim 4,
Wherein the primer layer has a thickness of 1 to 15 mu m. The method according to claim 1,
Wherein the adhesive layer comprises 0.3 to 5 parts by weight of a photoinitiator per 100 parts by weight of the main resin. 9. The method of claim 8,
Wherein the main resin comprises at least one selected from the group consisting of a urethane resin, an acrylate resin, a urethane-acrylate, an epoxy acrylate, and a polyester acrylate resin. 9. The method of claim 8,
The photoinitiator
1. A display protective film comprising at least one selected from the group consisting of a first photoinitiator comprising a compound represented by the following formula (1) and a second photoinitiator comprising a hydroxy ketone.
[Chemical Formula 1]

Wherein R ¹ , R ² and R ³ are each independently a hydrogen atom or a C ₁ to C ₅ alkyl group, R ⁴ is a hydrogen atom, a C ₁ to C ₅ alkyl group or a C ₄ or more alicyclic alkyl group or C _{Is an} aryl group having ₆ or more carbon atoms. 11. The method of claim 10,
Wherein the photoinitiator comprises a first photoinitiator and a second photoinitiator in a weight ratio of 1: 0.5 ~ 2. The method according to claim 1,
Wherein the pressure-sensitive adhesive layer comprises a silicon-based pressure-sensitive adhesive. The method according to claim 1,
Wherein the upper protective layer is at least one side of the display protective film. The method according to claim 1,
Wherein the upper protective layer is subjected to anti-fouling treatment on at least one side thereof. The method according to claim 1,
Further comprising an upper release film on the adhesive layer,
And a lower release film below the adhesive layer. 16. The method of claim 15,
The upper release film has a thickness of 4.5 to 75 탆,
Wherein the lower release film has a thickness of 7 to 100 占 퐉.

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