KR101692922B1 - Released films - Google Patents

Abstract

A base film; And a release layer formed on the base film and including a graft polymer having a side chain of a silicone acrylate resin bonded to the main chain of the acrylic resin; A release film is provided. The releasing film can be used not only for the silicone pressure sensitive adhesive but also for protecting the acrylic pressure sensitive adhesive, and can be excellent in releasing force, adhesiveness, curability and the like. In addition, it exhibits low scratch resistance and can be formed with a low residual surface tack.

Description

Release film {RELEASED FILMS}

The present invention relates to a release film excellent in releasing force, and more particularly, to a release film excellent in physical properties such as releasing force and adhesion, while protecting the acrylic and silicone adhesive layers.

The release film is generally used for the main purpose of protecting the pressure-sensitive adhesive layer (or the pressure-sensitive adhesive layer). The release film is generally used for general industrial adhesive (or adhesive) tape and the like, and the use thereof in the IT field such as mobile phone, LCD, semiconductor, and display is rapidly increasing.

1 is a cross-sectional view showing a release film produced according to a conventional technique.

Referring to FIG. 1, the release film may include a base film 2 and a release layer 4. The base film 2 is made of a material selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polybutylene naphthalate ), Polyethylene (PE), polypropylene (PP), and paper. The release layer 4 is mainly composed of a siloxane-based silicone composition.

When the releasing layer 4 is made of a siloxane-based silicone composition, the physical properties such as the lowering of the releasing force, the lowering of the residual sticking rate and the lowering of adhesion are not only lower than expected but also have a problem of being transferred in the process , A siloxane-based resin, a cross-linking agent, and an adhesion improver have been added to the siloxane-based silicone composition. However, this has been a hindrance to the realization of certain physical properties.

Further, the use of the acrylic pressure-sensitive adhesive in the release film coated with the release layer 4 comprising the siloxane-based silicone composition is very easy. However, in the case of using a silicone adhesive, the difference in surface tension between the silicone adhesive and the release layer 4 is not large, and the release of the adhesive is difficult because the adhesive is wetting the surface of the release layer 4 completely. Therefore, when the release layer 4 contains a siloxane-based silicone composition, it can not be used for protecting the silicone-based pressure-sensitive adhesive. In order to solve such problems, a fluorosilicon coating film has been developed. However, there is a problem that efficiency and economical efficiency of the process are deteriorated due to high cost of silicon and difficulty of manufacturing equipment.

Therefore, there is a demand for the production of a release film which protects not only the acrylic pressure-sensitive adhesive but also the silicone pressure-sensitive adhesive, and which has excellent physical properties such as stable releasing force, adhesion, and non-conductivity.

Korean Patent Publication No. 10-2012-0056564

Embodiments of the present invention provide a release film comprising a release layer that can be used for protecting the acrylic pressure sensitive adhesive and for protecting the silicone pressure sensitive adhesive.

In other embodiments of the present invention, there is provided a release film having an excellent physical property value required as a release film such as releasing force and adhesion.

In one embodiment to accomplish the object of the present invention, a substrate film; And a releasing layer formed on the base film and including a releasing layer comprising a graft polymer in which a side chain of a silicone acrylate resin is bonded to a main chain of the acrylic resin.

In an exemplary embodiment, the acrylic resin has a molecular weight in the range of 20,000 to 40,000, and the silicone acrylate resin may have a molecular weight in the range of 10,000 to 15,000.

In an exemplary embodiment, the substrate film is polyethylene terephthalate (PET), and the release layer may have a thickness of 0.05 to 2 占 퐉.

In an exemplary embodiment, the release layer can be formed using a composition consisting of 10 to 30 parts by weight of the graft polymer, 5 to 10 parts by weight of a curing agent, and 20 to 60 parts by weight of a solvent, based on the total weight of the release layer.

In an exemplary embodiment, the curing agent may be an isocyanate curing agent.

In an exemplary embodiment, the solvent used is a toluene solvent and a methyl ethyl ketone (MEK) solvent, and 50 parts by weight of the toluene solvent and 50 parts by weight of the methyl ethyl ketone solvent are included relative to the total weight of the solvent can do.

In an exemplary embodiment, the substrate film may be a non-surface treated film.

In an exemplary embodiment, the acrylic resin may be selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, n-octyl acrylate, lauryl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, Methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, lauryl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, , At least one monomer selected from the group consisting of 2-methoxyethyl acrylate, ethoxymethyl acrylate, 2-methoxyethyl methacrylate, ethoxymethyl methacrylate, benzyl acrylate and benzyl methacrylate, The silicone acrylate resin is a copolymer synthesized by polymerizing a polysiloxane monomer and an acrylic monomer, and the polysiloxane monomer is represented by the following formula Wherein the acrylic monomer is at least one selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, n-octyl acrylate, lauryl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, Acrylates such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, lauryl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, The acid may be at least one selected from the group consisting of isooctyl, 2-methoxyethyl acrylate, ethoxymethyl acrylate, 2-methoxyethyl methacrylate, ethoxymethyl methacrylate, benzyl acrylate and benzyl methacrylate.

 [Chemical Formula 1]

(Wherein n ₁ is an integer of 0 to 3, n ₂ is an integer of 1 to 20, R is an alkyl group having 1 to 4 carbon atoms directly bonded to a silicon atom, a phenyl group having 1 to 6 carbon atoms, a halogen, an epoxy group Or a cyano group.)

In an exemplary embodiment, the release film can be used for the protection of silicone-based tackifiers and acrylic-based tackifiers.

In an exemplary embodiment, the release film can be surface hardened at a temperature in the range of 80 to 120 占 폚.

In an exemplary embodiment, the release film may exhibit a release force in the range of 40 to 48 gf / inch.

The release film according to an embodiment of the present invention may form a release layer including a graft polymer in which a side chain of a silicone acrylate resin is bonded to a main chain of an acrylic resin. Since the releasing layer can have both the properties of a silicone-based resin and an acrylic resin, it can be easily used not only for protecting the acrylic pressure-sensitive adhesive but also for protecting the silicone pressure-sensitive adhesive.

In addition, the releasing layer not only exhibits a stable releasing force but also can be easily used in a field where a releasing film having a high residual adhesive property in a subject and excellent in adhesiveness and non-conductivity is required.

1 is a cross-sectional view showing a release film according to the prior art.
2 is a cross-sectional view showing a release film according to an embodiment of the present invention.
Figs. 3A and 3B are photographs showing the results of implementing the experiment of metastability on the glass surface of the release film produced according to Example 1 and Comparative Example 1. Fig.
FIG. 4 is a graph showing the results of measurement of the release force change value with time of a release film produced according to Example 1 and Comparative Example 1. FIG.

As used herein, the term " silicone acrylate resin " refers to a copolymer synthesized by polymerizing a polysiloxane monomer and an acrylic monomer.

As used herein, the term " non-surface treated film " means a substrate film whose surface has not undergone corona discharge treatment.

Hereinafter, embodiments of the present invention will be described in detail.

Release film

2 is a cross-sectional view of a release film according to an embodiment of the present invention.

2, a release film according to an embodiment of the present invention includes a base film 20 and a release layer 40, and the release layer 40 is formed by a side chain of a silicone acrylate resin in the main chain of the acrylic resin And may comprise a combined graft polymer.

The release layer 40 may be formed on the base film 20, and may be formed to have a thickness of about 0.05 to 2 mu m.

The release layer 40 may comprise a graft polymer with a side chain of a silicone acrylate resin having a molecular weight in the range of about 10,000 to 15,000 bonded to the main chain of the acrylic resin having a molecular weight in the range of about 20,000 to 40,000.

In an exemplary embodiment, the acrylic resin may be a polymer material formed by polymerization of at least one of the acrylic monomers.

In an exemplary embodiment, the acrylic monomer is selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, n-octyl acrylate, lauryl acrylate, isobutyl acrylate, Methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, lauryl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, , Methacryloxypropyl methacrylate, 2-methoxyethyl acrylate, ethoxymethyl acrylate, 2-methoxyethyl methacrylate, ethoxymethyl methacrylate, benzyl acrylate and benzyl methacrylate.

In an exemplary embodiment, the silicone acrylate resin may be a copolymer synthesized by polymerizing a polysiloxane monomer and an acrylic monomer.

In an exemplary embodiment, the polysiloxane monomer may be a polysiloxane comprising repeating units represented by formula (1).

[Chemical Formula 1]

In Formula 1, n ₁ is an integer of 0 to 3, n ₂ may be an integer of 1 to 20, n is an integer of 0 to 3, and R is an unsubstituted or substituted hydrocarbon having a carbon atom directly bonded to a silicon atom Lt; / RTI > Examples of the unsubstituted hydrocarbon group include an alkyl group, a cycloalkyl group, an aryl group, and an alkylaryl group, and particularly preferably an alkyl group having 1 to 6 carbon atoms such as a methyl group, an ethyl group, and a butyl group or a phenyl group. Examples of the substituted hydrocarbon group include a substituted hydrocarbon group having a halogen, an epoxy group, a cyan group and the like, and particularly, a? -Glycidoxypropyl group, a? - (3,4-epoxy) cyclohexylethyl group, It can be said that.

In an exemplary embodiment, the acrylic monomer may be a substance having reactivity with a silanol group and a silanol group-forming atomic group. Specific examples include methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, n-octyl acrylate, lauryl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, methyl methacrylate, Propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, lauryl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, isooctyl methacrylate, 2-methoxyethyl acrylate , Ethoxymethyl acrylate, 2-methoxyethyl methacrylate, ethoxymethyl methacrylate, benzyl acrylate, and benzyl methacrylate.

In an exemplary embodiment, the release layer 20 may further comprise a curing agent and a solvent.

In an exemplary embodiment, the release layer 20 may comprise 10 to 30 parts by weight of the graft polymer, 5 to 10 parts by weight of the curing agent, and 20 to 60 parts by weight of the solvent, based on the total weight of the release layer 20.

In an exemplary embodiment, the curing agent includes, for example, toluene diisocyanate (TDI), xylylene diisocyanate (XDI), hexamethylene diisocyanate, isophorone diisocyanate , IPDI), uretonimine triisocyanate, and the like can be used.

In an exemplary embodiment, a toluene solvent and / or a methyl ethyl ketone (MEK) solvent may be used as the solvent. When a solvent is used, 50 parts by weight of a toluene solvent and 50 parts by weight of a methyl ethyl ketone solvent can be used relative to the total weight of the solvent.

There is no limitation on the type of the base film 10, but known base film of release coating can be used. The base film 2 is made of a material selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polybutylene naphthalate ), Polyethylene (PE), polypropylene (PP), and paper.

Further, the base film 10 according to one embodiment of the present invention may be a uniaxial or biaxial oriented film having high transparency and excellent productivity and processability.

In the exemplary embodiment, the base film 10 may be a corona discharge treated film for the purpose of improving adhesion, but a non-surface treated film which is not a corona discharge treated film may be used.

The release film according to an embodiment of the present invention may include a release layer 40 including a graft polymer in which a side chain of a silicone acrylate resin is bonded to a main chain of an acrylic resin. Since the graft polymers have both the properties of a silicone resin and an acrylic resin, they can be used in both silicone-based pressure-sensitive adhesives and acrylic pressure-sensitive adhesives, and thus can be used in a wider application range.

Further, in an exemplary embodiment, the release film can be surface hardened at a temperature in the range of about 80 to 120 < 0 > C. In general, when the release layer contains only siloxane-containing water, the surface hardening temperature may be high. On the other hand, the release film according to one embodiment of the present invention can be formed to have a very low surface hardening temperature of about 80 to 120 캜. This can increase the efficiency of energy usage in the manufacturing process.

In addition, the base film (10) of the present invention can be excellent in adhesion with the release layer (20) and separately formed pressure-sensitive adhesives without corona discharge treatment. The adhesion between the base film 10 and the release layer 20 is weak and the surface of the base film 10 is modified through a corona discharge process so that the release layer 10 according to an embodiment of the present invention has a cohesive force So that the adhesion strength of the base film 10 with the base film 10 can be maintained without performing the corona discharge treatment process.

The release layer 20 according to an embodiment of the present invention includes a graft polymer in which a side chain of a silicone acrylate resin is bonded to the main chain of an acrylic resin and thus the releasing force, , Curability and the like can be excellent. In addition, it exhibits low scratch resistance and can be formed with a low residual surface tack.

Hereinafter, embodiments of the present invention will be described with reference to drawings and tables. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby.

Example 1

The polyester film was corona discharge treated to form a base film. Thereafter, a graft polymer having a side chain of a silicone acrylate resin bonded to the main chain of the acrylic resin was formed. 3 parts by weight of a uretonimine triisocyanate compound curing agent was diluted with 100 parts by weight of the graft polymer in a solvent (Toluene: MEK = 1: 1) to prepare a composition having a total solid content of 2% by weight And was coated on the base film so as to have a thickness of 1 mu m. Thereafter, hot air was blown for 10 seconds at a temperature of 80 캜 to prepare a release film.

Example 2

A release film was prepared in the same manner as in Example 1, except that hot air drying was conducted at a temperature of 100 占 폚.

Example 3

A release film was produced in the same manner as in Example 1, except that hot air was dried at a temperature of 120 占 폚.

Example 4

A release film was produced in the same manner as in Example 2, except that the corona discharge treatment process was not performed on the polyester film.

Comparative Example 1

Optical property A haze 2.5% polyester film was subjected to corona discharge treatment to form a base film. Thereafter, 3 parts by weight of a platinum-based catalyst 50T of Shin-Etsu was diluted with 100 parts by weight of a release agent of Shin-Etsu polysiloxane-based KS847 in a solvent (toluene: MEK = 1: 1) to prepare a silicone release composition having a total solid content of 2% And was coated on the base film so as to have a thickness of 2 mu m. Thereafter, hot air was blown for 10 seconds at a temperature of 80 캜 to prepare a release film.

Comparative Example 2

A release film was prepared in the same manner as in Comparative Example 1, except that hot air drying was conducted at a temperature of 100 占 폚.

Comparative Example 3

A release film was produced in the same manner as in Comparative Example 1, except that hot air was dried under a temperature of 120 占 폚.

Comparative Example 4

A release film was prepared in the same manner as in Comparative Example 2, except that the corona treatment process was not performed after forming the polyester base film.

EXPERIMENTAL EXAMPLE 1 Evaluation of Physical Properties of Release Film

The releasing force, residual adhesion, adhesion, curability, metastability and static friction coefficient of the release films prepared according to Examples 1 to 4 and Comparative Examples 1 to 4 were measured and are shown in Table 1. Each evaluation method is as follows.

<Evaluation of Release Force>

An acrylic pressure-sensitive adhesive tape (TESA7475) having a width of 50 mm and a length of 175 mm was adhered to the release films prepared according to Examples 1 to 4 and Comparative Examples 1 to 4, and the release force was measured according to the FINAT-10 evaluation method. That is, a standard tape was reciprocated twice at a speed of 10 mm / sec using a FINAT test roller (2 Kg load) to press the release tape on the release film produced according to Examples 1 to 4 and Comparative Examples 1 to 4, For sufficient compression of the release film and the standard tape, specimens were placed between two flat metal plates and stored at a temperature of about 23 캜 for 20 hours at a pressure of 70 g / cm 2. Thereafter, the pressure was removed, and each release film was fixed to the jig four hours later, and then the standard tape was peeled off from the release film at a rate of 300 mm / min in the direction of 180 degrees. At this time, each release film was repeatedly measured five times, and the average value (g / inch) thereof was measured.

Further, in the above experiment, releasing force of release films according to Examples 1 to 4 and Comparative Examples 1 to 4 was measured again using a silicone adhesive tape in place of the acrylic adhesive tape.

<Evaluation of Residual Adhesion Rate>

A standard adhesive tape (No. 31B) was applied to the release films prepared according to Examples 1 to 4 and Comparative Examples 1 to 4, and residual adhesive force and basic adhesive force were measured under constant temperature and humidity conditions of 22 ° C and 55% RH.

The residual adhesive strength was obtained by reciprocating the pressure-sensitive adhesive tape formed on each release film one time using a 2 kg rubber roller, heating at lOO &lt; 0 &gt; C for 1 hour, peeling the release film from the pressure- And the adhesive strength to the 3lB adhesive tape was measured. That is, each of the release films was peeled and removed. The 3lB adhesive tape was pressed on a metal plate and attached, and then the adhesive strength was measured by pulling off at 180 degrees to obtain a value for residual adhesive force.

The basic adhesive force was obtained by using the same adhesive tape (No. 31B) as in the case of the residual adhesive force, measuring the adhesive force by peeling the adhesive tape onto the metal plate and pulling it off at 180 degrees. The residual adhesive force and the basic adhesion force were calculated according to the following formula (1).

[Equation 1]

Residual Tack (%) = (Residual Tack / Base Tack) X 100

&Lt; Evaluation of hardenability &

The release films prepared according to Examples 1 to 4 and Comparative Examples 1 to 4 were each cured, and then the surface of the release layer was strongly rubbed ten times. Thereafter, whether or not the surface of the release layer was blurred and whether it was peeled off was visually observed. At this time, when no cloudiness and peeling were observed, the results were shown as &quot; o &quot;; and when the surface was cloudy, the results were shown as &amp; In addition, in the case of peeling, it was indicated by X regardless of cloudiness.

&Lt; Evaluation of adhesion &

The release films prepared according to Examples 1 to 4 and Comparative Examples 1 to 4 were respectively cured and then stored at a temperature of 60 ° C for 24 hours. Thereafter, the surface of each release layer was rubbed ten times strongly, and then whether or not the surface of the release layer was blurred and peeled off was visually observed. At this time, when no cloudiness and peeling were observed, the results were shown as &quot; o &quot;; and when the surface was cloudy, the results were shown as &amp; In addition, in the case of peeling, it was indicated by X regardless of cloudiness.

<Evaluation of Friction Coefficient>

The coefficient of friction of the release films prepared according to Examples 1 to 4 and Comparative Examples 1 to 4 was measured according to the measurement method shown in JIS K7125 using Toyoseiki Friction Tester TR-2.

The results measured according to the above evaluation methods are shown in Table 1 below.

Evaluation items Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example
3 Comparative Example 4 Release force
(Acrylic point wear) 48g 43g 44g 45g 37g 27g 23g 25g Release force # 2
(For silicone adhesive) 90g No peeling Residual sticking rate 93% 98% 98% 97% 82% 90% 92% 91% Hardenability △ ○ ○ ○ X △ ○ ○ Adhesiveness ○ ○ ○ ○ X X △ △ Coefficient of static friction 13Us 13Us 12Us 12Us 27Us 23Us 20Us 20Us Coefficient of dynamic friction 11Uk 10Uk 11Uk 11Uk 23Uk 20Uk 18Uk 18Uk

Table 1 shows that the releasing films according to Examples 1 to 4 were superior in releasing force to the releasing films according to Comparative Examples 1 to 4 when they were used for acrylic point application. On the other hand, the release film according to Comparative Example 3 was not peelable when used for a silicone adhesive, but when the release film according to Example 3 was used for a silicone adhesive, a releasing force of 90 g was obtained, there was.

In addition, in the case of the release films according to Examples 1 to 4, the residual sticking ratio exceeded 95%, indicating that the target material was not contaminated or remnants remained. On the other hand, the release films according to Comparative Examples 1 to 4 were inferior to the release films according to Examples 1 to 4.

The release films according to Examples 1 to 4 showed excellent characteristics due to the absence of fogging and peeling, but the release films according to Comparative Examples 1 to 4 exhibited not only fogging but also peeling.

In the friction coefficient measurement experiment, the static friction coefficient and the dynamic friction coefficient of the release layers produced according to Examples 1 to 4 were lower than those of the release layers prepared according to Comparative Examples 1 to 4, The slip property of the release film including the release layer produced according to the present invention was maintained and the scratch resistance of the product was low.

Experimental Example 2: Evaluation of metastasis

The release film according to Example 1 and Comparative Example 1 formed on each glass surface was strongly rubbed ten times, and then the flow or peeling off of the release layer film was visually observed, and at the same time, the contamination of the glass surface was examined under an optical microscope . The results are shown in FIG.

Figs. 3A and 3B are photographs showing the results of implementing the experiment of metastability on the glass surface of the release film produced according to Example 1 and Comparative Example 1. Fig.

3A, in Comparative Example 1 using the siloxane-based silicone release layer, a large amount of residue remained on the glass surface, indicating that the transition to the glass surface proceeded considerably. On the other hand, referring to FIG. 3B, it was confirmed that the use of the release film according to Example 1 resulted in almost no remnants remaining on the glass surface.

Experimental Example 3: Evaluation of releasing force

3, 5, 7, 9, 12, 15, 18, 21, 24, 27, and 30 at 22 ° C and 55% constant temperature and humidity conditions, respectively, after the release films according to Example 1 and Comparative Example 1 were prepared. After storage for one day, the release force was measured according to the FINAT-10 measurement method. The results are shown in Fig.

Referring to FIG. 4, in the release film according to Comparative Example 1 using the siloxane-based release agent, the release force exhibited a maximum value of 25 gf / inch, and it was confirmed that the release force decreased to at least 15 gf / inch over time . In contrast, the release film produced according to Example 1 exhibited a releasing force of 40 to 48 gf / inch, and it was confirmed that the releasing force was maintained substantially regardless of the passage of time.

2, 20: base film
4, 40:

Claims (11)

A base film; And
And a release layer formed on the base film and including a graft polymer in which a side chain of a silicone acrylate resin is bonded to a main chain of the acrylic resin,
Release film used for protecting silicone adhesives and protecting acrylic adhesives. The method according to claim 1,
Wherein the acrylic resin has a weight average molecular weight ranging from 20,000 to 40,000 and the silicone acrylate resin has a weight average molecular weight ranging from 10,000 to 15,000. The method according to claim 1,
Wherein the base film is polyethylene terephthalate (PET), and the release layer has a thickness of 0.05 to 2 占 퐉. The method according to claim 1,
Wherein the release layer is formed using a composition consisting of 10 to 30 parts by weight of the graft polymer, 5 to 10 parts by weight of a curing agent and 20 to 60 parts by weight of a solvent based on the total weight of the release layer. 5. The method of claim 4,
Wherein the curing agent is an isocyanate curing agent. 5. The method of claim 4,
The solvent used was a toluene solvent and a methyl ethyl ketone (MEK) solvent at the same time,
50 parts by weight of the toluene solvent and 50 parts by weight of the methyl ethyl ketone solvent based on the total weight of the solvent. The method according to claim 1,
Wherein the base film is a non-surface-treated film. The method according to claim 1,
The acrylic resin may be at least one selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, n-octyl acrylate, lauryl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, methyl methacrylate, , Propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, lauryl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, isooctyl methacrylate, 2-methoxyacrylic acid At least one monomer selected from the group consisting of ethyl, ethoxymethyl acrylate, 2-methoxyethyl methacrylate, ethoxymethyl methacrylate, benzyl acrylate and benzyl methacrylate is polymerized,
The silicone acrylate resin is a copolymer synthesized by polymerizing a polysiloxane monomer and an acrylic monomer,
The polysiloxane monomer may be a polysiloxane comprising a repeating unit represented by the following general formula (1), and the acrylic monomer may be selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, n-octyl acrylate, lauryl acrylate, Propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, lauryl methacrylate, isobutyl methacrylate, isobutyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, isobutyl methacrylate, 2-methoxyethyl acrylate, ethoxymethyl acrylate, 2-methoxyethyl methacrylate, ethoxymethyl methacrylate, benzyl acrylate and benzyl methacrylate Lt; RTI ID = 0.0 &gt; 1, &lt; / RTI &gt;
[Chemical Formula 1]

(Wherein n ₁ is an integer of 0 to 3, n ₂ is an integer of 1 to 20, R is an alkyl group having 1 to 4 carbon atoms directly bonded to a silicon atom, a phenyl group having 1 to 6 carbon atoms, a halogen, an epoxy group Or a cyano group.) delete The method according to claim 1,
Lt; RTI ID = 0.0 &gt; 80-120 C. &lt; / RTI &gt; The method according to claim 1,
A release film having a release force in the range of 40 to 48 gf / inch.

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