KR101880182B1 - Release film - Google Patents

Abstract

The present invention relates to a release film for the formation of a ceramic green sheet, which is formed by stacking an application layer and a release layer in order on a polyester base film. If the release film of the present invention is used for a ceramic green sheet forming process, the film is capable of improving a peeling property and achieving excellent applicability of ceramic slurry, thereby enabling the formation of a thinner green sheet. The present invention is capable of improving the reliability of an MLCC chip, including reducing the likelihood of a short circuit and improving a break down voltage (BDV), after processing a laminated ceramic condenser (MLCC) by processing a green sheet uniformly.

Description

Release Film {RELEASE FILM}

The present invention relates to a release film, and more particularly, to a release film which is formed by sequentially laminating a coating layer and a release layer on at least one surface of a polyester base film and has excellent releasability when used in a ceramic green sheet molding process, To a release film capable of preventing the occurrence of pinholes and improving the coating ability of a ceramic slurry to be formed into a thin film green sheet.

Multilayer ceramic capacitor (MLCC) is a universal core component commonly used in electronic products such as mobile phones and LCD TVs, and plays a role in flowing the current required for the product. In general, a release film based on a polyester film is used as a carrier film for forming a green sheet, and a green sheet of a multilayer ceramic capacitor (MLCC) is processed using the release film. In recent years, miniaturization and miniaturization of multilayer ceramic capacitors (MLCC) have been progressed due to miniaturization and thinning of electronic products. Accordingly, green sheets are gradually becoming thinner, larger, and more stratified.

In order to satisfy the thinning, large-area and high-layering of such a green sheet, the solid content and viscosity of the ceramic slurry must be lowered, and the ceramic slurry must be coated on the release film for forming ceramic slurry with a large area. When the ceramic slurry is not uniformly applied to the release film or pinholes are formed in the ceramic slurry coating layer due to the tendency of the green sheet to gradually become thinner, larger, and more stable, a multilayer ceramic capacitor (MLCC) Short) defects, and the problem of lowering the breakdown voltage (BDV) is likely to occur.

As a prior art disclosed as an effort to solve such a problem, Korean Patent No. 597896 discloses a mold releasable film which can be used for forming a thin film green sheet without causing blocking even when a release film having a flat surface is released, In order to provide a film, in a release film coated with a release layer on one side of a polyester film, the center line average roughness Ra of the release layer surface is 30 nm or less and the height X of the projection on the release layer surface and the number Y), a release film for forming a thin film green sheet is proposed. However, only the protrusion number of 400 nm or more on the surface of the release layer is managed, and there is no limit to the maximum protrusion height which affects the pinhole of the actual green sheet.

In addition, Korean Patent No. 1140413 discloses that when used as a release film in a green sheet forming process, the green sheet and the release film can be formed by the poor pinhole defects and non- Discloses a releasing film for forming a green sheet capable of improving the peeling phenomenon caused by peeling. However, when silane is applied only to the adhesive layer of the base film, the silane having a low molecular weight has a great followability to the surface irregularities of the base film, There is a problem in that irregularities on the surface can not be easily flattened.

Korean Patent Laid-Open Publication No. 2015-132229 discloses a process for producing a release film having a center line average roughness (Ra) of 8 nm or less and a maximum protrusion height (Rp) of 50 nm or less by introducing a flattening layer using a low- However, the low molecular weight curable resin has a large followability with respect to the surface irregularities of the base film, so that irregularities on the surface of the release film can not be easily flattened.

Accordingly, the present inventors have made efforts to provide a release film capable of satisfying the physical properties required in the trend of thinning and large-sized green sheet, and as a result, the present invention has been achieved.

Patent Document 1: Korean Patent No. 597896 Patent Document 2: Korean Patent No. 1140413 Patent Document 3: Korean Patent Publication No. 2015-132229

It is an object of the present invention to provide a release film having excellent releasability in a green sheet forming process and improved coating ability of a ceramic slurry, and to provide a release film having poor pinhole property of a green sheet, non- uniform coating phenomenon of a ceramic slurry, The problem is to improve.

Another object of the present invention is to realize a MLCC chip reliability improvement effect such that a short defect after the MLCC process is reduced by uniform green sheet processing and an breakdown voltage (BDV) is improved.

The present invention relates to a polyester-based film,

A coating layer for flattening the illuminance of the film, and

A release layer formed by sequentially laminating a release layer on one side of the coating layer,

The coating layer is formed by curing a curable acrylic resin composition containing inorganic nanoparticles having an average particle diameter of 30 to 100 nm,

The center line average roughness of the surface of the release layer is 15 nm or less, and the maximum projection height (Rmax) is 150 nm or less.

And the inorganic nanoparticles are contained in an amount of 1 to 25 parts by weight based on 100 parts by weight of the coating layer composition.

And the glass transition temperature of the curable acrylic resin in the coating layer is 80 to 130 ° C.

The thickness of the coating layer is 1 to 3 mu m.

The releasing layer has a green sheet peel strength of 1 to 10 gf / 25 mm.

The base film contains particles for improving running characteristics between rolls, and the average particle diameter of the particles is 0.1 to 5 占 퐉.

The base film contains particles for improving running characteristics between rolls, and the content of the particles is 0.01 to 5% by weight based on the total weight of the base film.

The release film of the present invention is excellent in peelability when used in a green sheet forming process and is excellent in coating ability of a ceramic slurry, so that a thinner green sheet can be formed and processed. In the conventional thin film and large- Poor pinhole resistance, heterogeneous coating of the ceramic slurry, and slippage caused by peeling of the green sheet due to the uneven coating. Further, by using the release film of the present invention in the process of forming a large-area green sheet, short defects after MLCC processing are reduced by processing the green sheet uniformly, and breakdown voltage (BDV) is improved To improve the reliability of the MLCC chip.

1 is a schematic view showing a structure of a release film of the present invention.

Below. The present invention will be described in detail with reference to Fig.

The release film of the present invention relates to a release film for molding a ceramic green sheet comprising a coating layer formed by coating a curable acrylic resin composition containing inorganic nanoparticles on at least one surface of a base film and a release layer formed on one surface of the coating layer.

1)

A polyester film is used as the base film of the present invention. The polyester film may be a conventionally known base film conventionally used in the field of silicone release coatings. In particular, the polyester base film of the present invention may be produced by a method disclosed in Korean Patent Nos. 1200566 and 1268584 , Korean Patent Publication Nos. 2012-45213 and 2012-99546, and the like will be applied. However, in order to explain only the features of the present invention in the embodiments of the present invention, the polyester base film is described without particular limitation, but it should be understood that it includes technical features relating to a known polyester base film.

Specifically, in the present invention, a polyester resin such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate is mainly described, but the substrate of the coating liquid for forming a coating layer of the present invention is not limited to a polyester sheet or a film . The polyester-based resin forming the film is a polyester obtained by polycondensing an aromatic dicarboxylic acid and an aliphatic glycol, and examples of the aromatic dicarboxylic acid include isophthalic acid, phthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid , And adipic acid, sebacic acid, oxycarboxylic acid (e.g., P-oxybenzoic acid) and the like, and examples of the aliphatic glycol include ethylene glycol, diethylene glycol, propylene glycol, butanediol, 1,4-cyclohexanedimethanol , Neopentyl glycol, and the like. The polyester-based resin may be used in combination of two or more of the dicarboxylic acid component and the glycol component, or a copolymer containing the third component may be used. Further, the polyester base film according to the present invention uses a uniaxial or biaxial oriented film having high transparency and excellent productivity and processability. Representative polyester resins include polyethylene terephthalate (PET) and polyethylene-2,6-naphthalenedicarboxylate (PEN).

In addition, the polyester film according to the present invention contains particles for imparting excellent roll-to-roll running characteristics, and there is no particular limitation on the type of particles added so long as they can exhibit excellent slip characteristics.

Specifically, it may include particles such as silica, silicon oxide, calcium carbonate, calcium sulfate, calcium phosphate, magnesium carbonate, magnesium phosphate, barium carbonate, kaolin, aluminum oxide, titanium oxide and the like. Although not limited, any of spherical, bulk, rod-shaped, and plate-shaped particles can be used.

Further, the hardness, specific gravity and color of the particles are not particularly limited, but two or more kinds may be used in combination if necessary. The average particle size of the particles used is preferably 0.1 to 5 mu m, 0.1 to 2 mu m is used. If the average particle size of the particles is less than 0.1 탆, coagulation phenomena may occur between the particles and dispersion failure may occur. On the other hand, when the average particle size of the particles exceeds 5 탆, the surface roughness characteristics of the film deteriorate, A coating failure may occur.

When the polyester base film contains particles, the content of the particles is preferably 0.01 to 5% by weight, more preferably 0.01 to 3% by weight. If the content of the particles is less than 0.01% by weight, the slipping property of the polyester film is deteriorated and the running characteristics between the rolls may deteriorate. If the content exceeds 5% by weight, the surface smoothness of the film may be deteriorated.

2) The coating layer 200

The coating layer of the present invention is formed by applying a composition comprising a curable acrylic resin and inorganic nanoparticles onto a base film.

The curable acrylic resin in the coating layer can be generally formed from a coating solution in which a thermosetting or photocurable compound is dissolved in a solvent.

The thermosetting or photo-curing compound may be a monomer or oligomer having at least one functional group such as an unsaturated bond group capable of performing a crosslinking reaction. Examples of the monomer or oligomer include urethane acrylate, epoxy acrylate, polyether acrylate, Dipentaerythritol pentaacrylate, dipentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, and the like, or a combination thereof can be used .

The acrylate resin preferably has a glass transition temperature of 80 to 130 ° C. A resin having a temperature of less than 80 DEG C tends to deteriorate the physical properties of the desired surface hardness when forming the coating layer and deteriorate the releasing properties of the releasing layer. When the temperature exceeds 130 DEG C, the bending property of the film is deteriorated after formation of the coating layer, Lt; / RTI >

The acrylate resin may be contained in the coating layer composition in an amount of 10 to 60 parts by weight, preferably 15 to 45 parts by weight, but is not limited thereto.

The inorganic nanoparticles included in the coating layer of the present invention preferably have an average particle diameter of 30 to 100 nm. When the average particle diameter of the inorganic nanoparticles satisfies the above range, there is an advantage that a uniform coating film can be formed by preventing coagulation in the composition. Further, it is possible to prevent the problem that the optical properties and the mechanical properties of the coating film are deteriorated.

The inorganic nanoparticles may be formed of at least one of Al ₂ O ₃ , SiO ₂ , ZnO, ZrO ₂ , BaTiO ₃ , TiO ₂ , Ta ₂ O ₅ , Ti ₃ O ₅ , ITO, IZO, ATO, ZnO -Al, Nb ₂ O _3, SnO, MgO, and may however comprise one or more of the group consisting of, and not limited to this may include a metal oxide that is commonly used in the art. Specifically, the inorganic nanoparticles may be Al ₂ O ₃ , SiO ₂ , or ZrO ₂ whose surface is substituted with a (meth) acrylic functional group or a hydroxyl group. The inorganic nanoparticles can be manufactured directly or commercially available.

In the embodiment of the present invention, the inorganic nanoparticles may be contained in an amount of 1 to 25 parts by weight, preferably 5 to 20 parts by weight, more preferably 5 to 15 parts by weight, based on 100 parts by weight of the total coating composition . When the inorganic nanoparticles are included in the above range, they are preferable in terms of mechanical strength. If the inorganic nanoparticles are less than the above range, the mechanical properties such as abrasion resistance, scratch resistance and pencil hardness may not be sufficient. If the inorganic nanoparticles are more than 25 parts by weight, the mechanical properties may deteriorate and the appearance may be deteriorated have.

In addition to the above-mentioned thermosetting or photo-curable compounds and solvents, the coating liquid for forming a coating layer may contain various additives insofar as the physical properties of the applied layer, such as a photopolymerization initiator, a light stabilizer, a leveling agent, and a silane coupling agent, have.

The coating liquid for forming a coating layer may be applied by a method such as flow coating, dip coating, spin coating, spray coating or the like in order to form the coating layer on at least one side of the base film And then cured with heat or light to form a coating layer exhibiting excellent surface roughness and hardness.

Specifically, the coating layer preferably has a thickness of about 1 mu m to about 3 mu m. When the thickness of the coating layer is less than 1 mu m, sufficient flatness is not ensured. When the thickness of the coating layer is more than 3 mu m, the coating layer composition is inferior in drying property and curl of the film.

3) Silicone release layer 300

The silicone release layer of the present invention is formed on at least one surface of the application layer and is formed by application of a silicone release coating liquid consisting of an alkenyl polysiloxane, a hydro pre-polysiloxane and a platinum chelate catalyst.

The alkenyl polysiloxane of the present invention may be any of various types such as addition type, condensation type, ultraviolet ray curable type and the like, and is not particularly limited to any one. The alkenyl polysiloxane may have an alkenyl group bonded to a silicon atom in any part of the molecule, and preferably has at least two alkenyl groups per molecule. In addition, the molecular structure is any one selected from a straight chain or branched chain, and a structure in which a straight chain and a branched chain coexist is also preferable. More specifically, the alkenyl group bonded to the silicon atom is selected from the group consisting of a vinyl group, an allyl group, a butenyl group, a pentenyl group, a hexenyl group, and a heptenyl group. Further, the alkenyl group bonded to the silicon atom in the alkenyl polysiloxane can be located along the molecular chain terminal, the side chain of the molecular chain, or the backbone of the molecular chain.

The hydrolytic polysiloxane is used as a curing agent for silicone release coating liquids, and any type such as addition type, condensation type, and ultraviolet ray curable type may be used, and is not particularly limited to any one. The hydrolytic polysiloxane may be linear, branched or cyclic, or a mixture thereof. The viscosity and molecular weight of the alkenyl polysiloxane are not limited, but the compatibility with the alkenyl polysiloxane should be good. The amount of hydrocarbons bonded to the silicon atom in the alkenyl group of the alkenyl polysiloxane ranges from 1.0 to 2.0 . When the number of hydrogen atoms bonded to the silicon atom per one alkenyl group of the alkenyl polysiloxane is less than 1.0, good curability is not obtained. When the number of the hydrogen atoms exceeds 2.0, the elasticity and physical properties after curing are deteriorated.

The silicone type release coating liquid is diluted with a solvent such that the total solid content is 0.5 to 3% by weight, and is coated on at least one surface of the coating layer. The solvent used in the silicone type releasing coating solution may be used without limitation as long as it can be coated on the coating layer by dispersing the solid content of the present invention.

If the total solids content of the silicone release coating solution is less than 0.5% by weight, a uniform silicone coating layer is not formed, and the separation between the adhesive coating layer provided on the release layer and the release film does not proceed properly, There is a problem that the green sheet may be peeled off. If the total solid content of the silicone release coating solution is more than 3% by weight, the leveling unevenness of the silicone coating layer may deteriorate the uniformity of the thickness of the green sheet after forming the adhesive coating layer and the green sheet.

In the release film of the present invention, it is preferable that the center line average roughness value (Ra) of the release layer surface is 15 nm or less and the maximum height (Rmax) of the surface protrusions is 150 nm or less due to the formation of the application layer. If the centerline average roughness value Ra of the surface of the release layer according to the present invention exceeds 15 nm, the thickness variation of the green sheet may occur during green sheet processing, and the maximum height R _max of the release layer surface protrusions may be 150 nm, defects such as electrical shorts may occur in the MLCC due to pin hole defects on the green sheet during green sheet processing.

The releasing force between the releasing layer and the green sheet of the present invention is 1 gf / 25 mm to 10 gf / 25 mm, preferably 3 gf / 25 mm to 7 gf / 25 mm at a 180 ° peeling angle and a 0.3 mpm peeling rate. At this time, if the peeling force is less than 1 gf / 25 mm, the adhesion property between the release layer and the green sheet is deteriorated and the problem of lifting the green sheet during the green sheet forming process may occur. If the peeling force exceeds 10 gf / 25 mm, The peeling of the green sheet may not be performed properly in the sheet stacking step, and the green sheet may be broken.

The release layer according to the present invention can be formed by conventional coating methods such as bar coating, gravure coating and die coating. Further, the method may be carried out by a method of processing a release layer in a continuous coating step after processing of a coating layer, but it is not limited to any one method.

Hereinafter, the present invention will be described in more detail with reference to Examples.

The present invention is intended to more specifically illustrate the present invention, and the scope of the present invention is not limited by these examples.

≪ Example of production of coating layer composition & Acrylic resin Inorganic nanoparticle manufacturer Glass transition temperature
(° C) manufacturer Average particle diameter
(nm) Particle content
(Parts by weight) Production Example 1 Miwon Specialty Chemical
Miramer M241 82 Nissan Chemical
PGM-AC-4130Y 40-50 20 Production Example 2 Aekyung Chemical AA-1001 96 Nissan Chemical
PGM-AC-4130Y 40-50 20 Production Example 3 Mitsubishi Rayon BR-80 105 Nissan Chemical
MEK-AC-5140Z 70-100 20 Production Example 4 Mitsubishi Rayon BR-80 105 Nissan Chemical
PGM-AC-4130Y 40-50 20 Production Example 5 Mitsubishi Rayon BR-80 105 Nissan Chemical
PGM-AC-2140Y 10-15 20 Production Example 6 Aekyung Chemical AA-1065 110 Nissan Chemical
PGM-AC-4130Y 40-50 20 Production Example 7 Aekyung Chemical AA-1065 110 - - - Production Example 8 Aekyung Chemical AA-1065 110 Nissan Chemical
PGM-AC-4130Y 40-50 30 Production Example 9 Aekyung Chemical AA-1021 65 Nissan Chemical
PGM-AC-4130Y 40-50 20

≪ Example 1 >

(Toluene) and a MEK 1: 1 solution as a coating layer composition of Production Example 1 and applied to a polyester film (XD500P-30 占 퐉, manufactured by Toray Advanced Materials Co., Ltd.), followed by heat treatment in a hot air drier at 150 占 폚 for 60 seconds, To prepare a coating layer.

5 parts by weight of a hydrolytic polysiloxane and 50 parts by weight of a platinum chelate catalyst were diluted with toluene (Toluene) and a 1: 1 solution of MEK to 100 parts by weight of the alkenylpolysiloxane on the above-mentioned coating layer to prepare a silicon mold release agent having a total solid content of 2% A coating solution was prepared and applied to a thickness of 10 탆. After application, the resultant was heat treated in a 180 hot air drier for 20 seconds to form a silicone type release layer to produce a release film for forming a ceramic green sheet.

≪ Example 2 >

A release film for forming a ceramic green sheet was prepared in the same manner as in Example 1, except that the composition of the coating layer was changed to Production Example 2 in Example 1.

≪ Example 3 >

A release film for forming a ceramic green sheet was prepared in the same manner as in Example 1 except that the composition of the coating layer was changed to Production Example 3 in Example 1.

<Example 4>

A release film for forming a ceramic green sheet was prepared in the same manner as in Example 1 except that the composition of the coating layer was changed to Production Example 4 in Example 1.

&Lt; Example 5 >

A release film for forming a ceramic green sheet was prepared in the same manner as in Example 1 except that the composition of the coating layer was changed to Production Example 6 in Example 1.

&Lt; Example 6 >

A release film for forming a ceramic green sheet was prepared in the same manner as in Example 1, except that the composition of the coating layer was applied to the substrate in Example 1 and then heat-treated to form a coating layer having a thickness of 3 탆.

&Lt; Comparative Example 1 &

A release film for forming a ceramic green sheet was prepared in the same manner as in Example 1 except that the composition of the coating layer was changed to Production Example 5 in Example 1.

&Lt; Comparative Example 2 &

A release film for forming a ceramic green sheet was prepared in the same manner as in Example 1 except that the composition of the coating layer was changed to Production Example 7 in Example 1.

&Lt; Comparative Example 3 &

A release film for forming a ceramic green sheet was prepared in the same manner as in Example 1 except that the composition of the coating layer in Example 1 was changed to that of Production Example 8. [

&Lt; Comparative Example 4 &

A release film for forming a ceramic green sheet was prepared in the same manner as in Example 1 except that the composition of the coating layer was changed to that of Production Example 9 in Example 1.

&Lt; Comparative Example 5 &

A release film for forming a ceramic green sheet was prepared in the same manner as in Example 1, except that the composition of the coating layer was applied and heat-treated in Example 1 to form a coating layer having a thickness of 0.8 탆.

EXPERIMENTAL EXAMPLE 1 Evaluation of surface roughness of release layer

The surface roughness properties of the release films for green sheet molding prepared in Examples and Comparative Examples were measured using a three-dimensional surface roughness meter (KOSAKA: model name SE3500K31) with a tip radius of 5 탆, a pressure of 30 mg, a measuring length of 0.5 mm, a CUTOFF (0.25 mm), and the center line average roughness (Ra) value and the maximum projection height (Rmax) were measured.

&Lt; Experimental Example 2 > Evaluation of coating performance of ceramic slurry

The properties of the release films for green sheet molding prepared in the above Examples and Comparative Examples were measured as follows, and the results are shown in Table 2 below.

&Lt; Preparation of ceramic composition &

5 parts by weight of a polyvinyl butyral resin (BL-10, manufactured by Sekisui Co., Ltd.), 3 parts by weight of dioctyl phthalate (DOP, Aekyu Oil Company, Ltd.), 100 parts by weight of a dispersant (BYK, disperbyk-180) is diluted in 10 parts by weight of a 1: 1 mixed solvent of toluene and ethanol.

<Green sheet manufacturing>

The ceramic composition was coated on the release layer side of the sample film at a WET thickness of 10 mu m and dried to prepare a green sheet.

<Evaluation of Coating Property>

The coated surface of the prepared green sheet was visually inspected, and pinholes and orange peel were evaluated according to the following criteria.

○: No pinhole or orange peel occurred

△: Pinhole and orange peel were weakly formed at the edge portion of the sample

X: Pinholes and orange peel occur on the entire surface of the sample.

&Lt; Experimental Example 3 > Measurement of peel force of green sheet

<Peel strength analysis sample preparation>

The prepared green sheet / sample film sample was prepared in a size of 25 mm x 150 mm.

- Measuring instrument: chem-instrument AR-1000

- Measuring method: 180 ° peeling angle, peeling speed 12 in / min

- Measurement data: The peeling force unit was gf / 25 mm and the measured value was measured five times to calculate the average value.

division Coating Evaluation Surface roughness Green sheet peel force (gf / 25mm) Centerline average roughness
(Ra) Maximum protrusion height
(Rmax) Example 1 ○ 11 124 8.4 Example 2 ○ 13 135 5.1 Example 3 ○ 12 111 4.0 Example 4 ○ 14 130 3.5 Example 5 ○ 11 125 2.3 Example 6 ○ 10 104 9.5 Comparative Example 1 △ 17 169 8.0 Comparative Example 2 × 19 195 10.2 Comparative Example 3 × 18 191 8.1 Comparative Example 4 ○ 13 125 12.3 Comparative Example 5 × 18 214 13.4

As shown in Table 2, the release films for forming green sheets of Examples 1 to 6 according to the present invention had excellent coating properties of the ceramic slurry and good peel stability against the green sheet after green sheet formation .

On the other hand, when the surface roughness of the release layer was not smooth (Comparative Examples 1, 2, 3 and 5), the slurry coating properties were poor and the hardness of the surface of the release layer was low (Comparative Examples 2, 4 and 5) And the peeling property was deteriorated.

The present invention provides a release film for molding a ceramic green sheet having a structure in which a planarization coated layer formed on at least one side of a polyester base film and a release layer formed on one side of the coated layer are sequentially laminated.

Thus, when the release film of the present invention is used in the ceramic green sheet forming process, a thin green sheet is formed by realizing excellent peelability and excellent coating property of the ceramic slurry, and at the time of forming a conventional thin film and a large- It is possible to improve the pinhole defects generated and the nonuniform coating phenomenon of the ceramic slurry and the slippage phenomenon occurring when the green sheet is peeled off.

Further, when the release film for molding a ceramic green sheet of the present invention is used as a release film in a large-area green sheet forming process, short defects after MLCC processing are reduced by processing a uniform green sheet, Break Down Voltage, BDV) can be improved by improving the reliability of the MLCC chip.

While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

100 base film
200 Coating layer
300 release layer

Claims (7)

On at least one side of the polyester base film,
A coating layer for flattening the illuminance of the film, and
A release layer formed by sequentially laminating a release layer on one surface of the coating layer,
The coating layer is formed by curing a curable acrylic resin composition having a thickness of 1 to 3 탆 and containing inorganic nanoparticles having an average particle diameter of 30 to 100 nm,
The glass transition temperature of the acrylic resin is 80 to 130 캜,
The release layer has a center line average roughness of 15 nm or less and a maximum protrusion height (Rmax) of 150 nm or less. The release film according to claim 1, wherein the inorganic nanoparticles are contained in an amount of 1 to 25 parts by weight based on 100 parts by weight of the coating layer composition. delete delete The release film according to claim 1, wherein the releasing layer has a green sheet peel strength of 1 to 10 gf / 25 mm. The release film according to claim 1, wherein the base film contains particles for improving running characteristics between rolls, and the average particle diameter of the particles is 0.1 to 5 占 퐉. The release film according to claim 1, wherein the base film contains particles for improving running characteristics between rolls, and the content of the particles is 0.01 to 5% by weight based on the total weight of the base film.

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