KR102648682B1 - Anti-static polyester release film - Google Patents

Abstract

The antistatic polyester release film according to an embodiment of the present invention is composed of a base film, an antistatic layer formed on the base film, and a release layer formed on the antistatic layer. By introducing the antistatic layer, the antistatic polyester release film that occurs when peeling off the conventional release film is reduced. The peeling voltage can be significantly lowered, and an increase in surface roughness of the film can be suppressed by making the antistatic layer ultra-thin, thereby providing an antistatic polyester release film with stable green sheet release properties.

Description

Anti-static polyester release film {ANTI-STATIC POLYESTER RELEASE FILM}

The present invention relates to an antistatic polyester release film. More specifically, the present invention relates to an antistatic polyester release film, and more specifically, by adding an ultra-thin antistatic coating to the base film, there is no increase in surface roughness, and the excellent antistatic function eliminates side effects caused by static electricity phenomenon when peeling off a ceramic green sheet. It is about an excellent anti-static polyester release film that can be used.

Recently, as the markets for semiconductors, electrical electronics, and displays have grown rapidly, related technology fields have also developed rapidly. Due to market expansion and technological development in the semiconductor, electrical and electronic, and display fields, the use of synthetic resins or synthetic fibers is rapidly increasing in the manufacturing process. As a result, problems with static electricity generated by synthetic resins or synthetic fibers in the manufacturing process are emerging. there is.

Additionally, in the field of release films used to protect components such as adhesives (adhesive layers), resin layers, and ceramic green sheet layers, the demand for anti-static functions is steadily increasing. A release film is a protective film that is usually attached to an adhesive layer or a green sheet layer to protect it from foreign substances in the air or unwanted landings, and generally has a structure in which a release layer is provided on one side of the base film. In particular, when using a release film on a green sheet, problems such as foreign matter mixing or peeling defects occur due to static electricity generated when the release film is separated from the green sheet layer, resulting in defects and short circuits in the finished product after lamination of the green sheet. As a result, the problem of decreased yield is increasing. Therefore, in recent years, antistatic functions have been increasingly added to the release layer of the release film used to protect ceramic green sheets.

Conventional antistatic release films can be broadly divided into a method of forming a coating layer by adding a metal or conductive polymer to the silicone release layer composition, and a method of coating the antistatic coating layer and the release layer separately. The method of coating by adding an antistatic composition to one coating layer composition is economical because it allows the coating layer to be formed at once, but the antistatic composition reduces the general physical properties that the release layer should have, and the solid content of the composition is high. It has the disadvantage of being difficult to apply to films with low illumination. In addition, when the antistatic coating layer and the release layer are coated separately, the antistatic coating layer affects the surface roughness of the release layer, and the release film affects the adhesive object.

Currently, as green sheets used in semiconductors, MLCC, etc. become increasingly thinner, the role of release films used for protection is becoming more and more important. In this way, as the green sheet becomes thinner, the roughness of the release film is greatly affected, and the roughness of the release film directly affects the yield of the finished product, leading to the need for advanced surface roughness management technology for the release film following the introduction of the base material and coating layer. It is being demanded.

Accordingly, the present inventors suppressed the increase in roughness of the base PET by forming an ultra-thin antistatic coating layer by coating the antistatic coating layer and the release layer separately, and increased the hardness of the antistatic coating layer to provide excellent antistatic properties and excellent ceramic green sheets. It was confirmed that an antistatic polyester release film with release properties could be manufactured, and the present invention was completed.

Korean Patent Publication No. 10-2006-0096665

The present invention was developed to solve the above problems, and the problem to be solved by the present invention is to form an ultra-thin anti-static coating through an in-line film manufacturing process, so as to have excellent anti-static properties and at the same time improve the film roughness according to the coating. It is an anti-static polyester release film that suppresses the rise of and reduces side effects such as contamination of the product due to static electricity phenomenon, poor peeling, and short circuit when used as a release film for electrical/electronic and display purposes. It is intended to provide.

In addition, the purpose of the present invention is to add a thin film release layer to the antistatic polyester release film through an offline film manufacturing process to achieve excellent ceramic slurry coating properties, green sheet appearance and peelability, and stable antistatic and release properties. The goal is to provide an anti-polyester release film.

The above and other objects and advantages of the present invention will become more apparent from the following description of preferred embodiments.

The above object can be achieved by an antistatic polyester release film that includes a base film, an antistatic layer formed on the base film, and a release layer formed on the antistatic layer, and has a surface roughness that satisfies the following equation (1).

(Equation 1)

10 < Ra1*Ra2*Ra3 < 1,000

Here, Ra1 is the three-dimensional surface roughness (SRa, nm) of the base film.

Ra2 is the three-dimensional surface roughness (SRa, nm) of the antistatic layer formed on the base film

Ra3 is the three-dimensional surface roughness (SRa, nm) of the release layer formed on the antistatic layer.

Preferably, the peeling voltage when peeling off the green sheet formed by applying the ceramic composition on the release layer may be 0.50 kV or less.

Preferably, the peeling force for the green sheet formed by applying the ceramic composition on the release layer may be 2 to 10.0 gf/inch.

Preferably, the release layer may have a sheet resistance of 10 ⁸ Ω/sq or less.

Preferably, the sheet resistance of the release layer may satisfy Equation 2 below.

(Equation 2)

1 < X/Y < 100

Here,

Y is sheet resistance measured after leaving at 60℃/90RH% for 30 days

Preferably, the sum of the thicknesses of the antistatic layer and the release layer may be 5 to 200 nm.

Preferably, the thickness of the release layer may be 70 to 90% of the total thickness of the antistatic layer and the release layer.

Preferably, the thickness of the antistatic layer may be 0.01 to 50 nm.

Preferably, the release layer may have a Si content of 0.010 to 0.200 g/m ² per unit area.

Preferably, the antistatic layer may be formed of an antistatic coating composition containing a conductive polymer resin, a crosslinking agent, a binder compound, a water-dispersible polyacrylic binder resin, and a surfactant.

Preferably, the antistatic coating composition contains 5 to 50 parts by weight of a crosslinker, 2 to 50 parts by weight of a binder compound, 5 to 100 parts by weight of a water-dispersible polyacrylic binder resin, and 0.001 to 2 parts by weight of a surfactant, based on 100 parts by weight of the conductive polymer resin. It may include wealth.

Preferably, the conductive polymer resin may include an aqueous dispersion containing a polyanion and a polythiophene derivative, or an aqueous dispersion containing a polyanion and a polythiophene derivative.

Preferably, the crosslinking agent may be any one selected from the group consisting of isocyanate-based, carbonylimide-based, oxazoline-based, epoxy-based, and melamine-based.

Preferably, the antistatic coating composition may have a solid content of 0.5 to 10.0% by weight.

Preferably, the binder compound may be an epoxy-based compound having an acrylate group.

Preferably, the silicone release composition forming the release layer may include a curable silicone resin.

Preferably, the application amount after drying of the release layer may be 0.005 to 0.200 g/m ² .

In addition, the above object is a first step of uniaxially stretching a polyester film, forming an antistatic layer by applying an antistatic coating composition containing a conductive composite to at least one side of the uniaxially stretched polyester film by in-line application. Step 2 and the third step of manufacturing a biaxially stretched polyester film by re-stretching the polyester film with the antistatic layer formed in a direction perpendicular to the uniaxial stretching direction and releasing the silicone release composition by applying an offline application method on the antistatic layer. This is achieved by a method of manufacturing an antistatic polyester release film including a fourth step of forming a layer.

Preferably, the fourth step may be a step of heat-curing the applied silicone release composition at 130°C to 280°C.

The antistatic polyester release film according to an embodiment of the present invention can significantly reduce the peeling voltage generated when peeling the release film by introducing an antistatic layer between the base film and the release layer, and by making the antistatic layer ultra-thin. By suppressing the increase in illumination, it is possible to provide a release film with stable green sheet release properties.

In addition, according to the present invention, it has stable antistatic performance even under low humidity, shows excellent stability over time, and has excellent transparency and smoothness.

In addition, according to the present invention, when ceramic slurry is applied to the antistatic polyester release film according to an embodiment of the present invention, it has excellent effects in terms of coatability, appearance, and peelability.

In addition, according to the present invention, it can be used in various applications such as displays as well as in the field of electronic and electrical materials such as MLCC, which requires anti-static performance such as optical films.

However, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a schematic cross-sectional view of an antistatic polyester film according to an embodiment of the present invention.
Figure 2 is a flow chart of a method for manufacturing an antistatic polyester release film according to an embodiment of the present invention.

With reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

In the drawing, the thickness is enlarged to clearly express various layers and areas. Throughout the specification, similar parts are given the same reference numerals. When a part of a layer, membrane, region, plate, etc. is said to be "on" another part, this includes not only being "directly above" the other part, but also cases where there is another part in between. Conversely, when a part is said to be “right on top” of another part, it means that there is no other part in between.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. In case of conflict, the present specification, including definitions, will control. Although methods and materials similar or equivalent to those described herein can also be used in the practice or testing of the present invention, suitable methods and materials are described herein.

Hereinafter, the antistatic polyester release film of the present invention will be described in detail.

1 is a schematic cross-sectional view of an antistatic polyester film according to an embodiment of the present invention. Referring to Figure 1, the antistatic polyester release film according to an embodiment of the present invention includes an antistatic layer 200 laminated on a base film 100, and a release layer 300 on the antistatic layer 200. Includes a layered structure.

1. Base film (100)

The base film 100 preferably contains a polyester resin such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. However, in the present invention, the description of the base film 100 focuses on polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, but the base film 100 is a polyester film or sheet. It is not limited.

The polyester resin constituting the base film 100 is a polyester obtained by polycondensing aromatic dicarboxylic acid and aliphatic glycol, and the aromatic dicarboxylic acid includes isophthalic acid, phthalic acid, terephthalic acid, and 2,6-naphthalene dicarboxylic acid. Ruboxylic acid, adipic acid, sebacic acid, oxycarboxylic acid, etc. are used, and aliphatic glycols include ethylene glycol, diethylene glycol, propylene glycol, butadiol, 1,4-cyclohexanedimethanol, neopentyl glycol, etc. It is desirable to use . In addition, the polyester resin constituting the base film 100 may be a combination of two or more of the above dicarboxylic acid component and glycol component, or a copolymer containing a third component may be used.

In addition, it is preferable to use a uniaxial or biaxially oriented film as the base film 100, which has high transparency and excellent productivity and processability. At this time, it is preferable to use polyethylene terephthalate (PET), polyethylene-2,6-natralenedicarboxylate (PEN), etc. as representative polyester resins.

Additionally, the base film 100 may contain particles to provide excellent running characteristics between rolls, and there is no particular limitation on the type of added particles as long as they can exhibit excellent sliding characteristics. As an example, the base film 100 may include particles such as silica, silicon oxide, calcium carbonate, calcium sulfate, calcium phosphate, magnesium carbonate, barium carbonate, kaolin, aluminum oxide, and titanium oxide. Additionally, the shape of the particles used is not particularly limited, but any of spherical, lumpy, rod-shaped, or plate-shaped particles can be preferably used.

In addition, there are no particular restrictions on the hardness, specific gravity, and color of the particles, but two or more types may be used in parallel as needed, and the average particle diameter of the particles used is preferably 0.1 to 1.5 ㎛, more preferably Those in the range of 0.1 to 1.0㎛ are used. At this time, if the average particle diameter of the particles is less than 0.1㎛, agglomeration between particles may occur, resulting in poor dispersion. On the other hand, if the average particle diameter of the particles exceeds 1.5㎛, the surface roughness characteristics of the film deteriorate, resulting in poor dispersion. Coating defects may occur during sheet post-processing.

Additionally, when the polyester base film contains particles, the particle content is preferably 0.01 to 10% by weight, and more preferably 0.01 to 5% by weight. If the particle content is less than 0.01% by weight, the running characteristics of the polyester film deteriorate, and if the particle content exceeds 10% by weight, the surface smoothness of the film deteriorates.

2. Anti-static layer (200)

The antistatic layer 200 is formed on at least one side of the base film 100. The antistatic coating composition forming the antistatic layer 200 includes a conductive polymer resin, a crosslinking agent, a binder compound, a polyacrylic binder resin, and a surfactant. More specifically, the antistatic coating composition includes 5 to 50 parts by weight of a crosslinker (B), 2 to 50 parts by weight of a binder compound (C), and a water-dispersible polyacrylic binder resin (D) based on 100 parts by weight of the conductive polymer resin (A). ) It is preferable that it is an aqueous solution containing 5 to 100 parts by weight and 0.001 to 2 parts by weight of surfactant (E).

Hereinafter, each component of the antistatic coating composition of the present invention will be described in detail.

First, the conductive polymer resin (A) is preferably an aqueous dispersion containing a polyanion and polythiophene or an aqueous dispersion containing a polyanion and a polythiophene derivative.

The polyanion is an acidic polymer, and preferably contains high molecular weight carboxylic acid, high molecular weight sulfonic acid, polyvinyl sulfonic acid, etc. Examples of polymer carboxylic acids include polyacrylic acid, polymethacrylic acid, and polymaleic acid, and examples of polymer sulfonic acids include polystyrene sulfonic acid, but are not limited thereto.

For polythiophene or polythiophene derivatives, it is preferable that the solid weight ratio of polyanion is excessive in terms of imparting conductivity. In the following examples of the present invention, an aqueous dispersion containing 0.5% by weight of poly(3,4-ethylenedioxythiophene) and 0.8% by weight of polystyrenesulfonic acid is used, but is not limited thereto. Preferably, the weight ratio of polythiophene or polythiophene derivative to polyanion is greater than 1 and less than 5, and more preferably greater than 1 and less than 3.

In addition, the cross-linking agent (B) contained in the anti-static coating composition is used to increase the hardness of the anti-static layer by increasing the cross-linking density and to improve the coating performance of the anti-static layer 200, which is judged to be the base layer of the release layer 300. . At this time, the preferred crosslinking agent component may be one or more resins selected from the group consisting of isocyanate-based, carbonylimide-based, oxazoline-based, epoxy-based, and melamine-based resins.

Meanwhile, the amount of the cross-linking agent added to the anti-static coating composition forming the anti-static layer 200 is preferably 5 to 50 parts by weight based on 100 parts by weight of the conductive polymer resin. At this time, if the amount of crosslinking resin added is less than 5 parts by weight, it is difficult to develop antistatic properties. On the other hand, if it exceeds 50 parts by weight, transparency is good but antistatic properties are reduced.

In addition, the binder compound (C) contained in the antistatic coating composition has excellent compatibility with conductive polymers, and is used to improve stretchability due to a swelling effect by attaching an alkenyl group to a functional group. At this time, the preferred binder compound component has at least one functional group selected from the group consisting of amino-based, epoxy-based, hydroxy-based, aldehyde-based, ester-based, vinyl-based, acrylic-based, imide-based, cyano-based and isocyanate-based. Specifically, it is characterized by containing an epoxy-based compound having an acrylate group.

Meanwhile, the amount of the binder compound (C) added to the antistatic coating composition forming the antistatic layer is preferably 2 to 50 parts by weight based on 100 parts by weight of the conductive polymer resin. At this time, if the amount of the binder compound added is less than 2 parts by weight, the stretchability is poor. On the other hand, if it exceeds 50 parts by weight, the stretchability is good, but transparency is poor.

In addition, the polyacrylic binder resin (D) is a water dispersion type, and preferably contains a resin made of a polyacrylate dispersion containing at least one functional group from the group consisting of hydroxyl group, amine group, alkyl group, and carboxyl group. . However, the type of polyacrylic binder resin (D) is not limited to this.

Meanwhile, the amount of polyacrylic binder resin added is preferably 5 to 100 parts by weight based on 100 parts by weight of the conductive polymer resin. At this time, if the amount of polyacrylic binder resin added is less than 5 parts by weight, the film performance of the antistatic layer deteriorates, and if it exceeds 100 parts by weight, the film performance is sufficiently secured, but the antifouling function and antistatic performance are deteriorated.

In addition, it is preferable to add a surfactant to the antistatic coating composition forming the antistatic layer 200 to improve stability, wetting, and application leveling.

Accordingly, the antistatic coating composition of the present invention contains an acetylene diol-based surfactant as a surfactant, thereby realizing excellent wettability and application leveling properties, while maintaining key coating properties such as peeling ability from adhesive tape and antifouling properties, resulting in excellent quality. It is possible to provide antistatic polyester films for optical/electrical/electronic applications with a high yield.

Acetylene diol-based surfactants used in antistatic coating compositions include, for example, trifluoromethyl group, methyl group, vinyl group, allyl group, ethynyl group, phenyl group, aryl group, halogen group, alkoxy group, cyano group, amino group, and hydroxyl group. , an acetylene diol-based surfactant containing at least one functional group selected from the group consisting of a carbonyl group, an ester group, and a carboxyl group can be used.

In one embodiment of the present invention, the surfactant (E) is an acetylene diol-based surfactant, such as 2,5,8,11-tetramethyl-6-dodecine-5,8-diol ethoxysilate (2, 5,8,11-Tetramethyl-6-dodecyn-5,8-diol ethoxylate) is used, but is not limited to this.

At this time, the preferred content of the acetylene diol-based surfactant is 0.001 to 2 parts by weight based on 100 parts by weight of the conductive polymer resin (A). If the amount of surfactant added is less than 0.001 parts by weight, the wetting of the coating film deteriorates, and if it exceeds 2 parts by weight, defects in the coating appearance occur due to microbubbles in the coating composition.

The antistatic coating composition forming the above-described antistatic layer 200 preferably has a solid content of 0.5 to 10.0% by weight, and more preferably 1.0 to 5.0% by weight, based on 100% by weight of the total coating composition. desirable. If the solid content is less than 0.5% by weight, it is not sufficient to form a coating layer and exhibit antistatic functions, and if it exceeds 10.0% by weight, it affects the transparency of the film, which is not desirable.

In addition, it is preferable that the solvent used in the antistatic coating composition is an aqueous coating solution with water as the main medium.

Additionally, the thickness of the antistatic layer 200 is preferably 0.01 to 50 nm. If the thickness of the coating layer is less than 0.01 nm, a uniform coating layer may not be formed and charging properties may be greatly reduced. On the other hand, if it exceeds 50 nm, the roughness of the antistatic polyester film on which the antistatic layer 200 is formed may increase, resulting in a decrease in green sheet coatability and peeling force after forming the release layer.

The antistatic polyester release film of the present invention can optimize desired physical properties depending on the specific composition of the antistatic coating composition. In other words, the antistatic layer 200 contains a conductive polymer to achieve stable antistatic performance, and contains a polyacrylic binder resin to improve antistatic properties. It also contains a crosslinking agent to improve film performance by controlling the crosslinking density, thereby improving mold release. The adhesion between the layers and the antistatic layer can be improved, and the wetting properties of the coating composition can be improved through the addition of an acetylene diol-based surfactant.

The antistatic layer 200 and the base film 100 formed by the antistatic coating composition and the antistatic coating composition described above are polyester coated with a coating solution containing a conductive polymer resin with excellent antistatic properties, a crosslinking agent, a binder, and a surfactant. It has an antistatic layer obtained by applying it to one side of the film and drying it. This antistatic layer has good appearance quality, excellent transparency and smoothness, and also has stable antistatic performance even under low humidity and is difficult to deteriorate over time. , it has the advantage of being usable in a wide range of applications, including display applications that require anti-static performance such as optical films, and electrical and electronic applications such as MLCC.

3. Release layer (300)

The release layer 300 constituting the antistatic polyester release film according to an embodiment of the present invention is formed by applying a silicone release composition on the antistatic layer 200 formed on one side of the base film 100, where the charge is applied. It is applied on the prevention layer 200 through offline coating.

The silicone release composition forming the release layer 300 contains curable silicone resin as its main ingredient. Any type of curable silicone resin can be used, such as addition type, condensation type, ultraviolet curing type, or solvent-free type. Specific examples include [KS-774], [KS-775], [KS-778], [KS-779H], [KS-847H], [KS-856], and [X-62] manufactured by Shin-Etsu Chemical Co., Ltd. -2422], [X-62-2461], [X-62-1387], [KNS-3051], [X-62-1496], [KNS320A], [KNS316], [X-62-1574A/B ], [X-62-7052], [X-62-7028A/B], [X-62-7619], [X-62-7213], Toray Dow Corning [DKQ3-202], [DKQ3 -203], [DKQ3-204], [DKQ3-205], [DKQ3-210], [SRX357], [SRX211], [SD7220], [LTC750A], [LTC760A], [SP7259], [BY24-468C ], [SP7248S], [BY24-452], [SP7268S], [SP7265S], [LTC1000M], [LTC1050L], [SYLOFF7900], [SYLOFF7198], [SYLOFF22A], etc. are examples.

Additionally, a peeling regulator may be used in combination to adjust the peelability, etc. of the release layer 300.

In addition, the applied silicone release composition can be cured and dried at a dryer temperature of 130°C to 280°C to form a release layer 300 with an excellent appearance, and more preferably, the drying temperature is 130°C to 150°C. It is effective.

In addition, there are no special restrictions on the application method of the silicone release composition for forming the release layer 300, and offline application methods such as bar, gravure, comma, and die coating can be applied. A cured release layer can be obtained by curing the liquid silicone release composition in a hot air dryer at a temperature of 130°C to 280°C for about 30 seconds.

At this time, the application amount after drying of the release layer 300 is preferably 0.005 to 0.200 g/m ² , and more preferably 0.005 to 0.080 g/m ² . If the application amount is less than 0.005 g/m ² , it is difficult to obtain a coating film due to poor application stability, and if the application exceeds 0.200 g/m ² , the green sheet peels off as the roughness increases when the green sheet is post-processed by the release coating layer. Strength increases and peeling uniformity decreases.

In addition, the release layer 300 preferably has a Si content of 0.01 to 0.200 g/m ² per unit area. If the Si content is less than 0.01 g/m ² , it is difficult to obtain a coating film due to poor application stability, and if it is more than 0.200 g/m ² , when the green sheet is processed through post-processing with a release coating layer, the green sheet peeling force increases as the roughness increases. and peeling uniformity deteriorates.

The arithmetic mean roughness (SRa) of the antistatic polyester release film according to an embodiment of the present invention preferably satisfies Equation 1 below.

(Equation 1)

10 < Ra1*Ra2*Ra3 < 1,000

Here, Ra1 is the three-dimensional surface roughness (SRa, nm) of the base film.

Ra2 is the three-dimensional surface roughness (SRa, nm) of the antistatic layer formed on the base film

Ra3 is the three-dimensional surface roughness (SRa, nm) of the release layer formed on the antistatic layer.

The antistatic polyester release film according to an embodiment of the present invention maximizes the swelling effect of the conductive polymer resin particles depending on the composition of the antistatic layer 200, and prevents static electricity by applying the thickness of the antistatic layer 200 to an ultra-thin film. While realizing the performance, it does not cause an increase in the surface roughness of the existing base film. This has the advantage of not causing an increase in the peeling force of the green sheet when the green sheet is applied after processing the release layer. If the value of Equation 1 is less than 10, blocking occurs when winding the film, making it difficult to use as a product, and if it is more than 1,000, the roughness is high and the peeling force becomes very high after applying the green sheet.

In the antistatic polyester release film according to an embodiment of the present invention, the release layer 300 must exhibit uniform coating properties of the green sheet and excellent peeling properties during the lamination process when applied to the green sheet. For this purpose, a ceramic composition was coated and dried on the release layer 300 to a thickness of 1 to 5㎛ to form a green sheet, the sample was cut to 1 x 11 inches, and the green sheet was measured with an AR-1000 peel force meter. When peeling at 30mpm and 90°, it is preferable that the peeling force is 2 to 10gf/inch. At this time, if the peeling force is less than 2gf/inch, the adsorption between the green sheet and the substrate is poor and a lifting phenomenon occurs, and if the peeling force exceeds 10.0gf/inch, the green sheet is torn before peeling occurs in the green sheet stacking process. A losing problem arises.

In addition, when peeling the above-described green sheet from the release layer 300, it is preferable that the peeling voltage is 0.50 kV or less. At this time, if the peeling voltage is greater than 0.50kV, foreign matter may be mixed in when peeling the green sheet.

In addition, the release layer 300 preferably has a sheet resistance of 10 ⁸ Ω/sq or less. At this time, if the sheet resistance of the release layer 300 exceeds 10 ⁸ Ω/sq, in the special case of increasing the thickness of the release layer 300, the sheet resistance becomes very high as the thickness is increased, and the advantage of the antistatic film is lost. You can. That is, as the thickness of the release layer 300 increases, the peeling force improves, but on the contrary, the effect of the antistatic layer 200 decreases, so in the present invention, the sheet resistance of the release layer 300 is 10 ⁸ Ω/sq or less. so that the release layer 300 can secure the required level of peeling force.

Additionally, the sheet resistance of the release layer 300 preferably satisfies Equation 2 below.

(Equation 2)

1 < X/Y < 100

X is sheet resistance measured after leaving for 30 days at 23℃/30RH%

Y is sheet resistance measured after leaving at 60℃/90RH% for 30 days

At this time, if the value of Equation 2 is 1 or less, the sheet resistance measured after leaving for 30 days at 60°C and 90RH% humidity increases, so there is a problem of deterioration of antistatic properties, and if the value of Equation 2 is 100 or more, The difference in sheet resistance between the case of leaving it at room temperature (25℃) with 30RH% humidity and the case of leaving it with 90RH% humidity at 60℃ is very large, so the sheet resistance between the surface part of the rolled roll and the core part varies greatly. It has disadvantages in terms of changes over time.

In addition, the total thickness of the antistatic layer 200 and the release layer 300 is preferably 5 to 200 nm. At this time, if the total thickness is less than 5 nm, the required antistatic properties and release properties cannot be secured, and if it is more than 200 nm, there is a problem of increased peeling force during green sheet coating.

Additionally, the thickness of the release layer 300 is preferably 70 to 90% of the total thickness of the antistatic layer and the release layer. At this time, if the thickness of the release layer 300 is less than 70% of the total thickness, the release property deteriorates, and if it exceeds 90%, the rub-off performance between the release layer 300 and the antistatic layer 200 deteriorates. have a problem.

Figure 2 is a flowchart of a method for manufacturing an antistatic polyester release film according to an embodiment of the present invention.

Referring to Figure 2, the method of manufacturing an antistatic polyester release film according to an embodiment of the present invention includes a first step (S101) of uniaxially stretching a polyester film, and at least one side of the uniaxially stretched polyester film. A second step (S102) of forming an antistatic layer by applying an antistatic coating composition containing a conductive composite using an in-line application method, and biaxial stretching by re-stretching the polyester film on which the antistatic layer is formed in a direction orthogonal to the uniaxial stretching direction. It includes a third step (S103) of manufacturing a polyester film and a fourth step (S104) of forming a release layer by applying a silicone release composition on the antistatic layer using an offline application method.

First, the first step (S101) of uniaxially stretching the polyester film will be described. In the first step (S101) of uniaxial stretching the polyester film, the polyester resin is vacuum dried, melted with an extruder, extruded into a sheet through a T-DIE, and electrostatically applied to a cooling roll (pinning). An unstretched polyester sheet is obtained by attaching it to a casting drum and cooling and solidifying it, which is uniaxially stretched 2 to 6 times by the difference in peripheral speed between the rolls on a roll heated above the glass transition temperature of the polyester resin. This is performed to produce a uniaxially stretched polyester film (base film).

Next, the second step (S102) of forming an antistatic layer by applying an antistatic coating composition containing a conductive composite to at least one side of the uniaxially stretched polyester film by in-line application method is 1 in the first step (S101). This is the step of forming an antistatic layer by applying the above-described antistatic coating composition to at least one side of the axially stretched polyester film.

More specifically, the method of applying the antistatic coating composition may be performed by a method such as a Meyer bar method or a gravure method, and a polar group is introduced to the film surface before application, thereby forming a bond between the applied layer and the film. It can be treated with corona discharge to improve adhesion or applicability. At this time, since the antistatic coating composition of the present invention is the same as the antistatic polyester release film described in FIG. 1, detailed description is omitted.

Next, the third step (S103) of manufacturing a biaxially stretched polyester film by re-stretching the polyester film on which the antistatic layer was formed in a direction orthogonal to the uniaxial stretching direction is the polyester film on which the antistatic layer was formed in the second step (S102). This is the step of producing a biaxially stretched polyester film by re-stretching the ester film. At this time, the stretching in the third step (S103) is stretched in a direction perpendicular to the direction of uniaxial stretching, and the preferable stretching ratio is 3.0 to 7.0 times. After this stretching process, an antistatic polyester film can be manufactured through heat setting, etc.

The total thickness of the base film and the antistatic layer prepared in the above-described first to third steps is preferably 5 to 300 μm, and more preferably 10 to 250 μm. If the thickness is less than 5㎛, the degree of deformation due to external force increases, so it cannot be used as a release film, and if the thickness of the film exceeds 300㎛, there is a problem of poor economic feasibility.

Next, in the fourth step (S104) of forming a release layer by applying the silicone release composition on the antistatic layer by offline application, a release layer is formed on the antistatic layer, and the base film, antistatic layer, and release layer are sequentially stacked. Manufactures an antistatic polyester release film.

At this time, in the fourth step (S104), the silicone release composition is heat-cured and dried to form a release layer. At this time, the drying temperature is preferably 130°C to 280°C, and more preferably 130°C to 150°C.

In addition, the application amount after drying of the release layer formed by the silicone release composition in the fourth step (S104) is preferably 0.005 to 0.200 g/m ² , and more preferably 0.005 to 0.080 g/m ² . If the application amount is less than 0.005 g/m ² , it is difficult to obtain a coating film due to poor application stability, and if the application exceeds 0.200 g/m ² , when the green sheet is processed through post-processing with the release layer, the green sheet peels off as the roughness increases. Strength increases and peeling uniformity decreases.

An offline application method is used as a method of applying the silicone release composition to form the release layer in the fourth step (S104). As examples, bar, gravure, comma, die coating, etc. can be applied, but this method must be used. It is not limited.

Hereinafter, the present invention will be described in more detail through examples. These examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited by these examples.

[Example]

[Example 1]

1. 1 axis stretching Manufacturing of polyester film

Polyethylene terephthalate pellets with an ultimate viscosity of 0.625 ㎗/g containing 0.1% by weight of amorphous spherical silica particles with an average particle diameter of 0.5㎛ were dried at 160°C for 7 hours using a vacuum dryer, then melted and extruded. An amorphous unstretched sheet was prepared by attaching it to a cooling drum through an electrostatic method through a T-die, and then heating it again and stretching it 4.0 times in the film direction at 95°C to prepare a uniaxially stretched polyester film.

2. 2 axis stretching Manufacturing of antistatic polyester film

Conductive polymer resin (A; aqueous dispersion containing 0.5% by weight of poly3,4-ethylenedioxythiophene and 0.8% by weight of polystyrene sulfonic acid (molecular weight Mn=150,000), average particle size 50nm), oxazoline crosslinker (B; Nippon Shokuba) Director, EPOCROS ^TM ), epoxy-based compound having an acrylate group (C), polyacrylic binder resin (D; polyacrylate water dispersion containing hydroxy group), acetylene diol-based surfactant (E; 2,5,8, 11-Tetramethyl-6-dodecine-5,8-diol ethoxylate) was mixed with water to prepare an antistatic coating solution with a solid content of 3% by weight based on the total coating solution. An antistatic coating composition was prepared by mixing components A, B, C, D, and E of the antistatic coating solution in the solid weight ratio shown in Table 1 below and stirring at room temperature for 60 minutes.

Next, the prepared antistatic coating composition is applied to one side of the uniaxial polyester film prepared in Step 1 using a gravure roll, and the coating solution is dried in a tenter section at 105 to 140°C, and then It was stretched 4.0 times in the vertical direction and heat treated at 240°C for 4 seconds to prepare a 30㎛ thick biaxially stretched antistatic polyester film.

3. Manufacturing of antistatic polyester release film

A polymer silicone product G (manufacturer: Shinetsu, product name: KS-847H) mixed with a polydimethylsiloxane main chain and curing agent in which the siloxane unit with a vinyl group is 3% by weight of the total siloxane units (manufacturer: Shinetsu, product name: KS-847H) and a mixture of platinum catalyst at a concentration of 5000ppm (manufacturer) : Shin-Etsu, product name: PL-50T) 0.15 parts by weight and 90 parts by weight of toluene were mixed and stirred at room temperature for 60 minutes to prepare an addition reaction type silicone release composition.

The prepared addition reaction silicone release composition was coated with Meyerbar (#5 mesh, manufactured by Cheminstruments) on one side of the antistatic polyester film prepared in Step 2, and then cured by heating at 150°C for 30 seconds using a hot air dryer. An antistatic polyester release film was manufactured by forming a release layer on the antistatic polyester film.

[Examples 2 to 16]

An antistatic polyester release film was prepared in the same manner as in Example 1, except for the weight ratio (% by weight) of the antistatic coating composition, the weight ratio (parts by weight) of the silicone release composition, and the amount of release layer applied as shown in Table 1 below.

[Comparative Examples 1 to 13]

An antistatic polyester release film was prepared in the same manner as in Example 1, except for the weight ratio (% by weight) of the antistatic coating composition, the weight ratio (parts by weight) of the silicone release composition, and the amount of release layer applied as shown in Table 1 below. At this time, the crosslinking agent F used in Comparative Examples 7 and 8 is a melamine compound (Sanwa Chemical, MW-22).

division Solids weight ratio (%) of antistatic coating composition Heterogeneous layer
Application amount (g/m ² ) A B C D E F Example 1 83.30 6.25 4.16 6.25 0.042 0.00 0.035 Example 2 88.21 4.41 2.94 4.41 0.029 0.00 Example 3 76.89 5.77 11.53 5.77 0.038 0.00 Example 4 68.94 5.17 20.68 5.17 0.034 0.00 Example 5 78.40 11.76 3.92 5.88 0.039 0.00 Example 6 65.55 26.22 3.28 4.92 0.033 0.00 Example 7 61.90 30.33 3.10 4.64 0.031 0.00 Example 8 75.44 5.66 3.77 15.09 0.038 0.00 Example 9 61.52 4.61 3.08 30.76 0.031 0.00 Example 10 47.49 3.56 2.37 46.54 0.024 0.00 Example 11 83.33 6.25 4.17 6.25 0.002 0.00 Example 12 81.98 6.15 4.10 6.15 1.623 0.00 Example 13 79.74 8.13 3.35 8.77 0.002 0.00 0.045 Example 14 72.71 5.45 10.91 10.91 0.018 0.00 0.094 Example 15 83.30 6.25 4.16 6.25 0.042 0.00 0.035 Example 16 59.94 14.99 9.99 14.99 0.100 0.00 Comparative Example 1 32.79 16.72 16.72 33.11 0.656 0.00 Comparative example 2 90.01 4.05 1.62 4.32 0.001 0.00 Comparative example 3 74.05 0.00 14.81 11.11 0.037 0.00 Comparative Example 4 74.05 14.81 0.00 11.11 0.037 0.00 Comparative Example 5 74.05 11.11 14.81 0.00 0.037 0.00 Comparative Example 6 0.00 22.81 21.73 55.40 0.054 0.00 Comparative example 7 70.15 0.00 14.03 10.52 0.035 5.26 Comparative example 8 66.64 0.00 13.33 10.00 0.033 10.00 Comparative Example 9 83.30 6.25 4.16 6.25 0.042 0.00 0.004 Comparative Example 10 83.30 6.25 4.16 6.25 0.042 0.00 0.215 Comparative Example 11 43.09 21.55 2.15 33.18 0.022 0.00 0.035 Comparative Example 12 83.33 2.08 4.17 10.42 0.007 0.00 0.508 Comparative Example 13 33.28 24.96 16.64 24.96 0.166 0.00 0.035

Using the antistatic polyester release films according to Examples 1 to 16 and Comparative Examples 1 to 13, physical properties were measured through the following experimental examples, and the results are shown in Table 2 below.

[Experimental example]

(1) Surface resistance measurement

For the antistatic polyester release films of Examples and Comparative Examples, samples were installed in an environment with a temperature of 23°C and humidity of 50%RH using a surface resistance meter (Mitsubishi, MCP-T600), and then the antistatic layer and the antistatic layer were measured in accordance with JIS K7194. The surface resistance to the release layer was measured.

(2) Surface resistance measurement according to temperature/humidity neglect period

The antistatic polyester release films of Examples and Comparative Examples were left in an environment of 23°C/30%RH and 60°C/90%RH for 1 to up to 30 days, and then measured using a surface resistance meter (Mitsubishi, MCP-T600). After installing the sample in an environment of temperature 23℃ and humidity 50%RH, the surface resistance of the release layer was measured according to JIS K7194. And the values of X/Y were calculated based on the surface resistance measurement results for the release layer and antistatic layer of Experimental Examples 1 and 2.

At this time,

(3) Measurement of release layer application amount

The amount of release layer applied to the antistatic polyester release films of Examples and Comparative Examples was measured using a calibrated X-ray fluorescent spectroscopy.

(4) Surface roughness measurement

Uncoated base PET (Toray Advanced Materials Co., Ltd., XD801) in the state of a base film without forming an antistatic layer and a release layer using an interferometric microscope (NT1100 from Veeco), a case where only an antistatic coating layer was formed on the base film in the second step, and Finally, in three cases where the release layer was formed through the third step, the three-dimensional surface roughness of each surface of the base film, antistatic layer, and release layer was measured non-contactly and expressed as SRa value. Next, the value of Equation 1 was calculated based on the measured surface roughness.

(Equation 1)

10 < Ra1*Ra2*Ra3 < 1,000

Here, Ra1 is the three-dimensional surface roughness (SRa) of the base film.

Ra2 is the three-dimensional surface roughness (SRa) of the antistatic layer formed on the base film.

Ra3 is the three-dimensional surface roughness (SRa) of the release layer formed on the antistatic layer.

The unit of Equation 1 is nm ³ .

(5) Ceramic green sheet analysis

Ceramic slurry formed of the following ceramic composition was applied and dried to a thickness of 5㎛ on the release layer of the antistatic polyester release film according to Examples and Comparative Examples and dried to form a ceramic green sheet, and then the slurry coatability and green sheet appearance were evaluated.

<Ceramic composition production>

For 100 parts by weight of barium titanate, 5 parts by weight of binder resin (polyvinyl butaral resin) was diluted with 10 parts by weight of a 1:1 mixed solvent of toluene and MEK.

<Slurry coatability judgment criteria>

○: Good coatability

△: There is some splashing phenomenon.

x: slurry splash

<Green sheet appearance judgment criteria>

Observe the surface of the ceramic green sheet coated on the release layer using an optical microscope.

○: No pinhole, no orange peel

△: Pinholes and some orange peel observed

x: Many pinholes and orange peel are observed.

(6) Measurement of green sheet peeling force

In Experimental Example 5, the antistatic polyester release film on which the green sheet was formed was peeled at a 90° angle with a sample size of 1 inchㅧ11inch, AR-1000, at a speed of 30mpm, and the peeling force was measured. At this time, the unit of peeling force is gf/inch, and the average value was calculated after measuring three times.

(7) Green sheet peeling voltage measurement

Regarding the antistatic polyester release film on which the green sheet was formed in Experimental Example 5, the attached green sheet was cut to 1 inchㅧ11inch, and then a peeling electrostatic voltage meter of STATIRON's DZ3 model was installed at a height of 10mm on the AR-1000 plate. After that, the highest voltage generated while peeling the green sheet at 30mpm and 90° was measured.

division Sheet resistance
(Anti-static layer) Sheet resistance
(Heterogeneous layer) Equation 2
(X/Y) Ceramic slurry coatability green
Sheet
Exterior green
Sheet
Peel force green sheet
peeling
high voltage math equation
One
(nm ³ ) Heterogeneous layer
Application amount Ω/sq. Ω/sq. gf/inch kV g/ ^m2 Example 1 2×10 ⁵ 2×10 ⁵ 10 ○ ○ 4.7 0.20 21.0 0.035 Example 2 6×10 ⁴ 6×10 ⁵ 15 ○ ○ 5.1 0.12 46.2 Example 3 5×10 ⁵ 5×10 ⁶ 27 ○ ○ 5.4 0.21 201.6 Example 4 8×10 ⁵ 8×10 ⁶ 20 ○ ○ 6.8 0.22 281.4 Example 5 3×10 ⁵ 3×10 ⁵ 22 ○ ○ 5.0 0.25 134.4 Example 6 6×10 ⁵ 6×10 ⁶ 24 ○ ○ 4.9 0.33 273.0 Example 7 8×10 ⁵ 8×10 ⁶ 28 ○ ○ 5.1 0.30 323.4 Example 8 4×10 ⁵ 4×10 ⁵ 20 ○ ○ 4.9 0.28 180.6 Example 9 5×10 ⁵ 5×10 ⁵ 16 ○ ○ 5.3 0.24 256.2 Example 10 8×10 ⁵ 8×10 ⁶ 10 ○ ○ 5.4 0.25 369.6 Example 11 2×10 ⁵ 2×10 ⁶ 10 ○ ○ 4.8 0.24 23.1 Example 12 2×10 ⁵ 2×10 ⁵ 13 ○ ○ 6.5 0.22 25.2 Example 13 9×10 ⁵ 6×10 ⁷ 77 ○ ○ 5.1 0.41 10.8 0.045 Example 14 2×10 ⁴ 2×10 ⁵ 8.0 ○ ○ 7.1 0.11 992.6 0.094 Example 15 2×10 ⁵ 2×10 ⁵ 1.1 ○ ○ 5.1 0.15 21.0 0.035 Example 16 2×10 ⁵ 2×10 ⁵ 99 ○ ○ 5.0 0.37 10.4 Comparative Example 1 8×10 ⁸ 2×10 ⁹ 132 △ △ 16.5 0.26 651.0 Comparative example 2 9×10 ⁷ 5×10 ⁸ 98 ○ ○ 10.1 0.75 142.8 Comparative Example 3 3×10 ⁵ 1×10 ⁶ 58 X △ 28.1 0.25 222.6 Comparative Example 4 1×10 ¹¹ 5×10 ¹¹ 24 X △ 23.3 1.20 138.6 Comparative Example 5 3×10 ⁵ 1×10 ⁶ 34 X △ 29.9 0.50 155.4 Comparative Example 6 1×10 ¹⁴ 1×10 ¹⁴ 1.0 X △ 8.8 11.1 231.0 Comparative example 7 8×10 ¹⁰ 2×10 ¹¹ 56 ○ ○ 7.8 0.23 184.8 Comparative example 8 6×10 ¹¹ 1×10 ¹² 68 ○ ○ 6.8 0.25 235.2 Comparative Example 9 3×10 ⁵ 7×10 ⁵ 11 ○ ○ 15.8 0.13 2.4 0.004 Comparative Example 10 3×10 ⁵ 1×10 ⁹ 10 ○ ○ 10.8 0.14 129.0 0.215 Comparative Example 11 1×10 ⁸ 5×10 ⁹ 25 △ △ 10.2 1.55 9.2 0.035 Comparative Example 12 3×10 ³ 3×10 ⁶ 2.0 △ △ 33.5 0.02 1005.8 0.508 Comparative Example 13 2×10 ⁵ 1×10 ⁶ 101 △ △ 9.8 2.13 21.0 0.035

As shown in Table 2, the antistatic polyester release films according to Examples 1 to 16 of the present invention have a sheet resistance of 10 ⁸ Ω/sq or less, and the variation in sheet resistance when stored for a long period of time at 60°C/90RH% is very excellent, The green sheet peeling voltage is less than 0.41 kV, showing excellent anti-static properties. In particular, the increase in surface roughness caused by the antistatic coating is small, so the coatability and appearance are excellent when applying ceramic slurry, and the green sheet peeling force is less than 7.1gf due to the surface roughness being at the same level as a general base film. Sheet peeling properties are observed.

On the other hand, in Comparative Examples 1 and 2, the ceramic slurry coatability and appearance quality of the green sheet deteriorated due to excessive and trace amounts of crosslinking agent and binder resin, respectively, and this also affected peelability, showing a tendency to increase green sheet peeling force. In addition, the sheet resistance of the release layer exceeds 10 ⁸ Ω/sq, showing high sheet resistance.

In addition, Comparative Examples 3 and 5 did not provide cross-linking characteristics of the antistatic layer due to the absence of cross-linking agent and binder resin, and the green sheet peeling force greatly increased, showing unfavorable physical properties in terms of peelability. In Comparative Example 6, in which conductive polymer A was not added, pinholes were generated during ceramic slurry coating, and the sheet resistance was over 10 ¹⁴ and the peeling voltage was 11.1 kV, so it did not have static dissipation characteristics.

In addition, in the case of the antistatic polyester release film of Comparative Example 4, since the epoxy-based compound C having an acrylate group is not added, the sheet resistance increases significantly, and the peeling voltage also increases accordingly. In addition, pinholes are generated during ceramic slurry coating, showing unfavorable physical properties when used as an antistatic release film.

In addition, in the case of the antistatic polyester release films of Comparative Examples 7 and 8, when cross-linking agent F is applied instead of cross-linking agent B, the green sheet appearance and peeling power are excellent, but the sheet resistance is greatly increased, and the green sheet peelability and peelability are improved. It is compared with the example that has all excellent antistatic properties.

In addition, in Comparative Examples 11 and 12, which do not satisfy the value of Equation 1, the sheet resistance is very high, exceeding 10 ⁸ , or the roughness of the release layer is greatly increased, and the green sheet peeling force is greatly increased, resulting in polyester release film for ceramic slurry. When used, it shows unfavorable physical properties.

In addition, in Comparative Examples 6 and 13, which do not satisfy the value of Equation 2, pinholes are generated during ceramic coating, and in the case of Comparative Example 6, there is a problem of ineffective static dissipation. In addition, in the case of Comparative Example 12, the sheet resistance increases when stored at room temperature, resulting in a problem of changes in antistatic properties over time when storing the wound roll.

In addition, in Comparative Example 10, the sheet resistance of the release layer was very high, exceeding 10 ⁸ due to the excessive amount of release layer applied, or the roughness was greatly increased due to the amount of release layer applied, and the green sheet peeling force was increased, making it difficult to use as a polyester release film for ceramic slurry. It shows unfavorable physical properties when used.

As described above, the antistatic polyester release film according to the present invention has excellent properties against static dispersion that may occur in the film by forming an antistatic layer, and also has stable antistatic performance even under low humidity and excellent stability over time. It has the characteristic of not increasing surface roughness even when forming an antistatic layer, and has excellent transparency and smoothness. When ceramic slurry is applied to an antistatic polyester release film, it is excellent in terms of coatability, appearance, and peelability. As such, it can be used in a variety of applications, such as displays, as well as in the field of electronic and electrical materials such as MLCC, which requires anti-static performance such as optical films.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

100: Base film
200: Anti-static layer
300: release layer

Claims (19)

Base film;
A charger containing 5 to 50 parts by weight of a crosslinking agent, 2 to 50 parts by weight of a binder compound, 5 to 100 parts by weight of a water-dispersible polyacrylic binder resin, and 0.001 to 2 parts by weight of a surfactant on the base film based on 100 parts by weight of the conductive polymer resin. An antistatic layer formed by applying an antistatic coating composition; and
A release layer formed on the antistatic layer;
Including,
The surface roughness satisfies Equation 1 below,
(Equation 1)
10 < Ra1*Ra2*Ra3 < 1,000
Here, Ra1 is the three-dimensional surface roughness (SRa, nm) of the base film,
Ra2 is the three-dimensional surface roughness (SRa, nm) of the antistatic layer formed on the base film,
Ra3 is the three-dimensional surface roughness (SRa, nm) of the release layer formed on the antistatic layer,
An antistatic polyester release film having a peeling voltage of 0.50 kV or less when peeling off a green sheet formed by applying a ceramic composition on the release layer. delete According to paragraph 1,
An antistatic polyester release film having a peeling force of 2 to 10.0 gf/inch or less against a green sheet formed by applying a ceramic composition on the release layer. According to paragraph 1,
The release layer is an antistatic polyester release film having a sheet resistance of 10 ⁸ Ω/sq or less. According to paragraph 1,
An antistatic polyester release film in which the sheet resistance of the release layer satisfies Equation 2 below.
(Equation 2)
1 < X/Y < 100
X is sheet resistance measured after leaving for 30 days at 23℃/30RH%
Y is sheet resistance measured after leaving at 60℃/90RH% for 30 days According to paragraph 1,
An antistatic polyester release film wherein the sum of the thicknesses of the antistatic layer and the release layer is 5 to 200 nm. According to paragraph 1,
An antistatic polyester release film wherein the thickness of the release layer is 70 to 90% of the total thickness of the antistatic layer and the release layer. According to paragraph 1,
An antistatic polyester release film wherein the antistatic layer has a thickness of 0.01 to 50 nm. According to paragraph 1,
The release layer is an antistatic polyester release film having a Si content of 0.01 to 0.200 g/m ² per unit area. delete delete According to paragraph 1,
The conductive polymer resin is an antistatic polyester release film comprising an aqueous dispersion containing a polyanion and a polythiophene derivative or an aqueous dispersion containing a polyanion and a polythiophene derivative. According to paragraph 1,
The antistatic polyester release film wherein the crosslinking agent is any one selected from the group consisting of isocyanate-based, carbonylimide-based, oxazoline-based, epoxy-based, and melamine-based. According to paragraph 1,
The antistatic coating composition is an antistatic polyester release film having a solid content of 0.5 to 10.0% by weight. According to paragraph 1,
The binder compound is an epoxy-based compound having an acrylate group, an antistatic polyester release film. According to paragraph 1,
The silicone release composition forming the release layer is an antistatic polyester release film comprising a curable silicone resin. According to paragraph 1,
The application amount after drying of the release layer is 0.005 to 0.200 g/m ² , an antistatic polyester release film. In the method for manufacturing the antistatic polyester release film according to claim 1,
A first step of uniaxially stretching the polyester film;
A second step of forming an antistatic layer by applying an antistatic coating composition containing a conductive composite to at least one side of the uniaxially stretched polyester film by in-line application; and
A third step of manufacturing a biaxially stretched polyester film by re-stretching the polyester film on which the antistatic layer is formed in a direction orthogonal to the uniaxial stretching direction; and
A fourth step of forming a release layer by applying a silicone release composition on the antistatic layer using an offline application method;
A method of producing an antistatic polyester release film comprising. According to clause 18,
The fourth step is a method of manufacturing an antistatic polyester release film, which is a step of curing the applied silicone release composition by heating at 130°C to 280°C.