KR20120042431A - Release film for multi-layer ceramic capacitor and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A releasable film for multiple layer ceramic capacitors and a manufacturing method thereof are provided to reduce driving fault and winding failure of the release film which is cause by lowering of surface roughness. CONSTITUTION: A releasable film(10) for multiple layer ceramic capacitors comprises a release layer(3), a base sheet layer(2), and a traveling improving layer(1). The releasable film for multiple layer ceramic capacitors is accomplished by laminating the release layer, the base sheet layer, and the traveling improving layer in order. The traveling improving layer consists of acrylic resin layer or urethane resin layer. A 3 dimensional central line average illumination(SRa) of the release layer side is 1-10 nano meters.

Description

Release film for multilayer ceramic capacitors and manufacturing method thereof {RELEASE FILM FOR MULTI-LAYER CERAMIC CAPACITOR AND MANUFACTURING METHOD THEREOF}

The present invention relates to a release film for a multilayer ceramic capacitor (hereinafter referred to as "MLCC") and a manufacturing method thereof, and more particularly, a release layer, a polyester base sheet layer, and an acrylic resin layer or a urethane resin layer. Release layer made of a successive layer made of, but the release layer surface has a three-dimensional center line average roughness (SRa) of 1 to 10nm, release film that is generated by satisfying the low surface smoothness and smooth surface The present invention relates to a release film for MLCC and a method for manufacturing the same, in which a driving defect and a winding defect of the battery are eliminated.

The release film is generally a structure in which a release layer is formed on a polyester base film such as polyethylene terephthalate and polyethylene naphthalate, which is used as a mount of an adhesive label, an adhesive tape, and the like. It is also used as a support (carrier film) for applying a thin and uniform ceramic slurry.

Multilayer Ceramic Capacitor (MLCC) is a type of capacitor (battery battery) used to accumulate electricity or stabilize current. Because of its small size and large capacitance, portable electronic devices such as mobile phones, MP3 players, and PMPs are widely used. Can be. In particular, mobile phones are used so that about 250 MLCCs are used per unit.

The MLCC is completed by stacking ceramic sheets and internal metal electrodes in alternating tens or hundreds of layers, and connecting external electrodes. The ceramic sheet used for the MLCC is formed by uniformly applying a ceramic slurry onto a carrier film as a support and then baking. As a carrier film for forming the ceramic sheet, a biaxially stretched polyester film having excellent mechanical strength, dimensional stability, heat resistance, and cost competitiveness is used as a base material, and a release film form in which a polymer silicon film is coated on one surface thereof. Is being used.

In recent years, according to the trend toward miniaturization and high capacity of MLCC, it is required to make the thickness of the ceramic sheet thinner and to laminate it in multiple layers. Specifically, the thickness of the ceramic sheet is 2 to 30 μm. Furthermore, the ceramic sheet of 1 micrometer thickness or less is also examined.

Accordingly, in order to mold the thinned ceramic sheet, a release surface having a flat surface, that is, a low surface roughness, may be uniformly formed and minimize the generation of pinholes.

In order to solve the above problems, a release film having a low surface roughness has been proposed in Korean Patent Publication Nos. 2001-0047780 and 2001-0047778, but when the surface roughness of the release film is designed to be lower than a predetermined level, Both surfaces are so slippery that the 'Rolling Rolls' used to transport the release film during the manufacture and use of the release film do not adhere well to the release film, and so-called 'runability defects' occur. In the process of winding (rolling in the form of a roll), a winding failure occurs in which the winding cross section of the release film becomes uneven and jagged.

The surface roughness of the release film is determined by the surface roughness of the polyester film used as the base material. In the case of the base film used in the release film for MLCC, a polyester film designed to have a very low surface roughness is used. Generally, such a polyester film is obtained by melting a polyester chip used as a raw material at a high temperature, extruding the molten polyester through a T-die onto a casting drum to obtain an unstretched sheet, which is uniaxially or biaxially stretched. It is manufactured through a step of obtaining a polyester film, wherein the surface roughness of the polyester film is determined according to the particle size, content of the organic or inorganic particles contained in the polyester chip used as a raw material, and the degree of stretching of the film. The conventional release film for MLCC can adjust the surface roughness by adjusting the particle size and content of most organic or inorganic particles (Korean Patent Publication Nos. 1999-0065011 and 2001-0047778).

However, in the case of the polyester film produced by lowering the surface roughness to a predetermined level or less by the conventional method, the above-mentioned 'runability poor' and 'wrong winding' is caused, so the approach of other methods is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a release film for MLCC, which has been solved for poor running and winding defects of a release film caused by smooth surfaces.

Another object of the present invention is an in-line coating on one surface of a uniaxially stretched polyester base sheet layer to form a runability improvement layer made of an acrylic resin layer or a urethane resin layer, and then a polyester base sheet layer having the runability improvement layer formed thereon. To provide a release film release film release film for MLCC to form a release layer on the back side.

In order to achieve the above object, the present invention is a release layer (3); Polyester base sheet layer (2); And an improved runnability improvement layer (1) made of an acrylic resin layer or a urethane resin layer; and the three-dimensional center line average roughness (SRa) of the release layer (3) is 1 to 10 nm. To provide.

The runability improvement layer includes a particle-containing polyester resin layer. At this time, the three-dimensional center line average roughness (SRa) of the polyester base sheet layer surface is preferably 1 to 10nm.

Furthermore, the present invention in-line coating a coating solution made of an aqueous solution containing an acrylic resin or a urethane resin on one surface of a uniaxially stretched polyester base sheet layer to form a traveling improvement layer made of an acrylic resin layer or a urethane resin layer. And forming the release layer by coating a release liquid on the back surface of the biaxially stretched polyester base sheet on which the runability enhancement layer is formed, and then forming a release layer. Provided is a method of manufacturing a release film for a capacitor (MLCC).

In addition, one surface of the uniaxially stretched polyester base sheet layer may be provided with a running property improving layer made of a particle-containing polyester resin layer.

In this case, the particle-containing polyester resin layer may be formed by co-extrusion of the particle-containing polyester resin chip mixed melted on the chip for preparing the polyester base sheet. After the said runability improvement layer is formed, the thickness of a biaxially-stretched polyester base sheet is 10-50 micrometers.

After the formation of the runability improvement layer, the back surface of the polyester base sheet is applied off-line to form the release layer. In this case, in the three-layered release film including the release layer, the three-dimensional center line average roughness of the release layer surface is 1 To 10 nm.

Furthermore, the present invention provides a polyester base sheet in which the traveling property improvement layer made of an acrylic resin layer or a urethane resin layer is integrated in one step by in-line coating.

At this time, in the polyester base sheet in which the runability improvement layer is integrated, the three-dimensional center line average roughness SRa of the back surface of the base sheet on which the runability improvement layer is formed satisfies 1 to 10 nm.

The present invention is a release layer; Polyester base sheet layer; And an improved runnability improvement layer formed of an acrylic resin layer or a urethane resin layer; and a release film for MLCC, which is sequentially laminated, wherein the surface of the release layer meets the smoothness of the surface having a 3D centerline average roughness (SRa) of 1 to 10 nm. It is possible to provide a release film for MLCC to solve the poor running and winding failure of the release film caused by the low roughness.

In addition, the present invention is formed by forming a release layer on the back surface of the polyester base sheet layer having the runability improvement layer formed after the in-line coating on one surface of the polyester base sheet layer uniaxially stretched to form a traveling improvement layer, The method of manufacturing a release film for MLCC which can improve the yield of MLCC can be improved by improving the pinhole problem occurring during sheet forming and thinning the multilayer sheet of MLCC through the release film with low surface roughness and stacking it in multiple layers. Can provide.

In addition, the present invention is provided with one step of the runnability improvement layer of the resin layer or urethane resin layer by one in-line coating on one surface of the polyester base sheet, the three-dimensional center line average of the back surface of the polyester base sheet provided with the runability enhancement layer The polyester base sheet which roughness SRa satisfy | fills 1-10 nm can be provided.

1 is a schematic cross-sectional view of a release film for MLCC of the present invention,
2 is a schematic cross-sectional view of the polyester base sheet of the present invention.

Hereinafter, the present invention will be described in more detail.

The present invention, as shown in Figure 1 , the release layer (3); Polyester base sheet layer (2); And the runability enhancement layer (1); is made by sequentially stacking, provides a release film 10 for MLCC having a three-dimensional center line average roughness (SRa) of the surface of the release layer (3) 1 to 10nm.

In the release film for MLCC of the present invention, three layers are provided with a running property improving layer 1 on one surface of the polyester base sheet layer 2 and a release layer 3 on the back side of the polyester base sheet layer 2. The polyester base sheet layer 2 of the present invention has a structure, and unlike inorganic or organic particles, in order to realize low surface roughness in a conventional release film, excludes particle content.

However, by providing the traveling property improvement layer 1 on one surface of the polyester base sheet layer 2, the adhesion with the transport roll can be facilitated, and the running failure can be eliminated.

In addition, in the present invention, the problem of winding failure can be solved by providing the running property improving layer 1 having the adhesiveness with the release layer 3 on the back surface of the release layer.

Thus, the release film for MLCC of the present invention can solve the conventional problems while meeting the low surface roughness (SRa) of the surface roughness on the surface of the release layer 3 meets the surface roughness (SRa) of 1 to 10nm. In addition, it is possible to improve the pinhole problem occurring during the molding of the ceramic sheet, and to increase the thickness of the MLCC ceramic sheet and to laminate the multilayer to contribute to the improvement of MLCC yield.

The present invention 1) improves the running property of the acrylic resin layer or the urethane resin layer by coating in-line a coating solution composed of an aqueous solution containing an acrylic resin or a urethane resin on one surface of the polyester base sheet layer (2) uniaxially stretched Forming layer (1),

2) after forming the traveling property improvement layer, to prepare a biaxially stretched polyester base sheet,

3) Provides a method for producing a release film for a multilayer ceramic capacitor (MLCC) consisting of forming a release layer by coating the release liquid on the back surface of the biaxially stretched polyester base sheet having the runability improvement layer.

In the manufacturing method of the present invention, by forming the traveling property improvement layer 1 on one surface of the particle-free polyester base sheet layer 2 in one step by in-line coating, by coating the release layer 3 in an off-line manner To manufacture.

Hereinafter will be described in detail for each process.

In the step 1) of the present invention, the sheet in the polyester base sheet layer 2 is obtained by melting the polyester chip at a high temperature and extruding it through a T-die and molding into a casting drum to obtain an unstretched sheet. Can be stretched in the longitudinal direction to obtain a uniaxial stretched sheet, and the uniaxial stretched polyester base sheet can be restretched in the width direction to obtain a biaxially stretched polyester base sheet.

At this time, the sheet used in the process 1) of the present invention is applied to the uniaxially stretched sheet, it is characterized in that it does not contain inorganic or organic particles in the manufacturing.

Subsequently, in the step 1), the traveling property improvement layer 1 is formed on one surface of the uniaxially stretched polyester base sheet layer 2 by in-line coating in one step.

At this time, the runability improvement layer 1 in-line-coats the coating liquid which consists of aqueous solution containing an acrylic resin or a urethane resin, and forms an acrylic resin layer or a urethane resin layer.

The coating solution is an aqueous solution containing 0.1 to 10% by weight of an acrylic resin or a urethane resin as a main component, and other components are conventionally known methods [Korean Patent Publication No. 1989-002936, Korean Patent Publication No. 2000-0056714 ] May be selected and employed as needed. but, If the content of the main component of the acrylic resin or urethane resin is less than 0.1% by weight, the effect is insignificant and undesirable. If the content of the main component exceeds 10% by weight, the viscosity of the coating solution is excessively high, resulting in impaired processability during the coating process. This nonuniformity causes a problem of poor appearance.

In the above-mentioned, in-line coating is to simultaneously perform coating in the polyester sheet manufacturing process, and the coating method such as gravure, lip, die, bar, comma, offset, etc. After apply | coating to either side of the film uniaxially stretched, it is a method of extending | stretching in the width direction. At this time, the coated coating liquid is dried and cured while passing through the hot air dryer which inevitably accompanies the stretching in the width direction.

Another method for forming the run-time improvement layer (1) in the step 1) of the present invention is to melt the particle polyester chip containing organic or inorganic particles at a high temperature during the polyester base sheet manufacturing process chip for producing a particle-free polyester base sheet And co-extruded through a specially prepared T-die to form a particle-containing polyester layer on one surface of the polyester base sheet layer (2).

Particle polyester chips containing the organic or inorganic particles are prepared by applying a conventionally known method to produce a predetermined amount of organic particles such as plate-shaped or spherical calcium carbonate or inorganic particles such as silica.

At this time, the co-extrusion is a technique for extruding two or more different polymer resins in a layer without melting and mixing, respectively, is made by using a specially designed T-die, the production of the polyester film of the present invention It can be utilized without particular limitation from known techniques.

It is preferable that the thickness of the polyester base sheet layer 2 with which the runability improvement layer 1 obtained from the process 1) of this invention was provided is 10-50 micrometers. At this time, if the thickness is less than 10㎛, the thickness is not uniform, the breakage of the film frequently during the manufacturing process is difficult to process into a normal product. On the other hand, if the thickness exceeds 50㎛, the rigidity of the product is increased, and when the process is subsequently used for molding the ceramic sheet is difficult to proceed the process, causing a poor peeling of the ceramic sheet and economical efficiency.

In addition, the 3D center line average roughness SRa of the back surface of the polyester base-sheet sheet layer 2 with which the runability improvement layer 1 obtained from the process 1) is 1-10 nm, At this time, the said polyester base-sheet The range in which the average roughness SRa on the back side of the layer 2 exceeds 10 nm is a range also achieved by the prior art, and is inexpensive due to the characteristics of the present invention with in-line coating. On the other hand, average roughness SRa of less than 1 nm is difficult to achieve technically.

2) process of the present invention is to prepare a biaxially stretched polyester base sheet after the formation of the runability improvement layer, and 3) the process is a release liquid on the back surface of the biaxially stretched polyester base sheet having the runability enhancement layer formed Is applied off-line to form the release layer 3.

The off-line coating is to cover all the methods of coating in a separate equipment separate from the film manufacturing equipment, utilizing the already prepared film, methods such as gravure, lip, die, bar, comma, offset, spray After coating the coating solution through a hot air drying it is formed by heat curing or ultraviolet curing.

The release liquid used in the present invention may be any one of a heat curable polymer silicone release liquid or an ultraviolet curable silicone release liquid, and more specifically, a thermosetting polymer silicone or platinum in a one-component or mixed organic solvent mainly containing toluene. Thermosetting polymer silicone release liquid by mixing a complex catalyst and other additives; Alternatively, a UV curable polymer silicone release liquid may be used by mixing a toluene based one component or mixed organic solvent, an ultraviolet curable polymer silicone, a platinum complex compound catalyst, a photoinitiator and other additives. Thereafter, after the release liquid is applied, heat release or heat curing through hot air drying is performed to form the release layer 3.

In the three-layer structure release film produced through the process 3) of the manufacturing method of the present invention, the three-dimensional center line average roughness (SRa) of the surface of the release layer (3) is 1 to 10 nm. At this time, if the average roughness (SRa) of the surface of the release layer 3 exceeds 10nm, there is a problem that pinholes occur in the ceramic sheet due to coarse protrusions on the surface of the release layer during processing of the ceramic sheet, the range of less than 1nm technically Hard to achieve.

In addition, the present invention, as shown in Figure 2 , the polyester substrate sheet layer (2) on one surface by the in-line coating the acrylic resin layer or the urethane resin layer of the runability improvement layer (1) is provided in one step poly An ester base sheet 11 is provided.

At this time, the three-dimensional center line average roughness SRa on the back surface of the polyester base sheet layer 2 on which the runability improvement layer 1 is formed is 1 to 10 nm. The range in which the average roughness SRa of the back surface of the polyester base sheet layer 2 exceeds 10 nm is a range achieved by the prior art, and is economically inferior in the characteristics of the present invention with in-line coating. On the other hand, average roughness SRa of less than 1 nm is difficult to achieve technically.

Accordingly, the polyester base sheet 11 of the present invention is poor in runningability by forming the runability improvement layer 1 on one surface of the polyester base sheet layer 2 having both surfaces which are free of organic or inorganic particles. And since it can solve the process problem of winding-up, it can be used as a base material of a release film.

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

The following examples are merely illustrative of the present invention, but the scope of the present invention is not limited to the following examples.

Example 1 Release Film 1

100 parts by weight of dimethyl terephthalate, 60 parts by weight of ethylene glycol, and 0.05 parts by weight of magnesium acetate were added to proceed with a transesterification reaction while gradually raising the temperature from 150 ° C to 240 ° C, and then 0.02 parts by weight of antimony trioxide as a polycondensation catalyst and 0.02 parts of trimethylphosphate. After the addition by weight, the polycondensation reaction was carried out to process the polyester resin, which was cooled, cut and dried to prepare a polyester chip having a size of about 1 cm 3.

Thereafter, the polyester chip was fed to an extruder, melted at a high temperature of 280 ° C., and then extruded through a T-die to the surface of a casting drum maintained at room temperature. The voltage was applied to keep the polyester resin in close contact with the casting drum surface. The casting drum was rotated at a high speed of 50 mpm to obtain an unstretched polyester sheet.

After stretching the unstretched polyester sheet 3.5 times in the longitudinal direction at 120 ° C. and applying a high voltage corona, the coating solution consisting of an aqueous solution containing 2% by weight of a water-soluble acrylic polymer resin (manufactured by Lohm's EXP3208) was coated. Thus, an acrylic resin layer was formed by in-line coating.

The uniaxially stretched polyester sheet on which the acrylic resin layer was formed was stretched 3.5 times in the width direction in a 120 ° C hot air drier and relaxed at 240 ° C to obtain a biaxially stretched polyester base sheet.

2 wt% of a thermosetting silicone mixed solution (produced by Shin-Etsu Co., Ltd. KS-847 product) having a solid content of 30% of solid content consisting of polydimethylsiloxane, polyhydrogensiloxane and toluene on the back surface of the biaxially stretched polyester base sheet, on which no acrylic resin layer was formed. And 0.05 wt% of a platinum complex catalyst (manufactured by Shin-Etsu Co., Ltd. PL-50T) in a residual amount of toluene were applied off-line using a gravure coater and then thermally cured to form a release layer.

Example 2 Release Film Preparation 2

A release film was prepared in the same manner as in Example 1, except that a coating solution consisting of an aqueous solution containing 2% by weight of a urethane resin (product of DIC EXP3208) was used as a coating solution for in-line coating. It was.

Example 3 Release Film 3

As a release liquid for producing a release layer, 2 wt% of an ultraviolet (UV) curable epoxy silicone mixed solution (produced by Shin-Etsu Co., Ltd. X-62-7622) containing a photoinitiator and a platinum complex catalyst (Shin-Etsu Co., Ltd. PL-50T) are contained in the remaining amount of toluene. A release film was prepared in the same manner as in Example 1, except that the release layer was formed by ultraviolet (UV) curing using an ultraviolet (UV) curable polymer silicone release liquid.

Example 4 Manufacturing Release Film 4

As a release liquid for producing a release layer, 2% by weight of an ultraviolet (UV) curable epoxy silicone mixed solution (produced by Shin-Etsu Co., Ltd. X-62-7622) containing a photoinitiator and a platinum complex catalyst (Shin-Etsu Co. PL-50T) are contained in the remaining amount of toluene. A release film was prepared in the same manner as in Example 2, except that the release layer was formed by ultraviolet (UV) curing using an ultraviolet (UV) curable polymer silicone release liquid.

Comparative Example 1

In the manufacturing process of the polyester chip of Example 1, except that 5 parts by weight of calcium carbonate inorganic particles having an average particle diameter of 1㎛ was added, except that the in-line coating process is not performed after the uniaxial stretching process, A release film was prepared in the same manner as in Example 1.

Comparative Example 2

In the manufacturing process of the polyester chip of Example 1, except that 20 parts by weight of calcium carbonate particles having an average particle diameter of 1 ㎛ is added and manufactured, except that the in-line coating process is not performed after the uniaxial stretching process. A release film was prepared in the same manner as in Example 1.

< Experimental Example >

1.3D Centerline Average Roughness (SRa)

SRa was measured using a contact three-dimensional roughness measuring instrument (manufactured by Kosaka Corporation SE3300), and the average value of five repeated measurements with a standard measuring length of 0.08 cm was described.

2. Processability

If one or more scratches with a length of more than 1 cm occur per sheet of A4 size due to poor running performance during the manufacturing process of the film, and if the film thickness variation by position is 1 µm or more, In any case where a large amount of bone of 1 mm or more occurred, it was determined as 'bad', otherwise 'good'.

3. Formability

A ceramic slurry was prepared by mixing 10 parts by weight of barium titanate particles having an average particle diameter of 0.2 μm, 1 part by weight of polyvinyl butyral, and 1 part by weight of a toluene mixed solvent, which were prepared in Examples 1 to 4 and Comparative Examples 1 and 2, respectively. After applying to a release layer formed on a release film to a certain thickness and hot-air dried at 80 ℃ temperature for 5 minutes to prepare a release film having an average thickness of 1㎛. Thereafter, the area of 1 mm 2 was observed 10 times with an interferometer microscope, and if the number of pinholes exceeding 1 μm was one or more per unit area (mm 2), it was determined as defective.

The results of measuring the physical properties of the release films prepared in Examples 1 to 4 and Comparative Examples 1 to 2 are shown in Table 1 below.

Manufacturing of Release Film Manufacture conditions Evaluation results Polyester base sheet layer (particle content,%) Driving Improvement Floor Release layer SRa ^film (nm) SRa ^{release layer} (nm) Processability Formability Example 1 0 acryl Thermosetting 6 7 Good Good Example 2 0 urethane Thermosetting 8 7 Good Good Example 3 0 acryl UV Curing 7 8 Good Good Example 4 0 urethane UV Curing 8 7 Good Good Comparative Example 1 5 - Thermosetting 11 8 Bad X Comparative Example 2 20 - Thermosetting 21 17 Good Bad SRa ^film : Three-dimensional center line average roughness (SRa) of the release layer surface in the polyester base sheet
SRa ^{release layer} : 3-dimensional centerline average roughness of the release layer itself (SRa)

As shown in the results of Table 1, in the case of the release film prepared in Examples 1 to 4, the three-dimensional center line average roughness (SRa) showed a result of less than 10nm, the processability of the film and the molding of the ceramic sheet also 'Good' results were confirmed. Therefore, while the surface roughness of the release film is designed to be 10 nm or less, the in-line driving layer is provided in the process of manufacturing the polyester base sheet, thereby reducing the problem of poor runability and winding failure caused by conventional low surface roughness. Resolved.

On the other hand, in the release films of Comparative Examples 1 and 2 prepared by containing inorganic particles in the polyester base sheet, three-dimensional center line average roughness (SRa) exceeding 10 nm was observed. Bad results were confirmed. In particular, in the case of Comparative Example 1 observed with a lower surface roughness than Comparative Example 2 according to the inorganic particle content, a normal release film could not be manufactured due to poor driving.

As described above,

First, the present invention is a release layer; Polyester base sheet layer; And a runability improvement layer consisting of an acrylic resin layer or a urethane resin layer; to provide a release film for MLCC laminated sequentially. The 3D center line average roughness (SRa) of the surface of the release layer was 1 to 10 nm to meet the smoothness of the surface while reducing the surface roughness caused by the poor running and winding failure of the release film.

In addition, the release film for MLCC of the present invention improves the pinhole problem that occurs during the molding of the ceramic sheet, and through the release film having a low surface roughness, the thickness of the MLCC ceramic sheet is further thinned and laminated in multiple layers to improve the yield of the MLCC. Can contribute.

Second, the present invention is to produce a release film for MLCC, characterized in that after forming the runability improvement layer on one surface of the particle-free polyester base sheet layer by in-line coating in one step, coating the release layer in an off-line method A method was provided.

Third, the present invention forms the runability improvement layer (1) on one surface of the polyester base sheet layer is smooth on both surfaces that do not contain any organic or inorganic particles, the problem of poor runability and winding unsatisfactory while satisfying low surface roughness The resolved polyester base sheet was provided. The polyester base sheet is useful as a base of the release film.

Although the present invention has been described in detail only with respect to the embodiments described, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and variations belong to the appended claims.

1: Runability improvement layer
2: polyester base sheet layer
3: release layer
10: Release film for MLCC
11: polyester base sheet

Claims (10)

Release layer;
Polyester base sheet layer; And
Runability improvement layer made of an acrylic resin layer or a urethane resin layer; is laminated sequentially, for the multilayer ceramic capacitor (MLCC) characterized in that the three-dimensional center line average roughness (SRa) of the surface of the release layer is 1 to 10nm Release film. The release film for MLCC according to claim 1, wherein the runability improving layer is a particle-containing polyester resin layer. The release film for MLCC according to claim 1 or 2, wherein the three-dimensional center line average roughness (SRa) of the surface of the polyester base sheet layer is 1 to 10 nm. On one side of the uniaxially stretched polyester base sheet layer, a coating solution made of an aqueous solution containing an acrylic resin or a urethane resin was in-line coated to form a traveling improvement layer made of an acrylic resin layer or a urethane resin layer,
After the runability improvement layer is formed, a biaxially stretched polyester base sheet is prepared,
A method of manufacturing a release film for a multilayer ceramic capacitor (MLCC), comprising forming a release layer by coating a release solution on the back surface of a biaxially stretched polyester base sheet on which the running property improvement layer is formed. The method of manufacturing a release film for MLCC according to claim 4, wherein a traveling property improvement layer made of a particle-containing polyester resin layer is formed on one surface of the uniaxially stretched polyester base sheet layer. The method for manufacturing a release film for MLCC according to claim 5, wherein the particle-containing polyester resin layer is mixed and melted and co-extruded onto a chip for preparing a polyester base sheet. The method of claim 4, wherein the biaxially stretched polyester base sheet has a thickness of 10 to 50 μm after the formation of the runability improvement layer. The mold release agent according to any one of claims 4 to 6, wherein the release layer is coated off-line so that the three-dimensional center line average roughness SRa of the surface of the release layer is 1 to 10 nm. Method for producing a film. A polyester base sheet in which the traveling property improvement layer of an acrylic resin layer or a urethane resin layer was provided in one process by in-line coating on one surface of a polyester base sheet. The polyester base sheet according to claim 9, wherein the three-dimensional center line average roughness (SRa) of the back surface of the polyester base sheet provided with the runability improvement layer is 1 to 10 nm.

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