KR20180077901A - Antistatic film - Google Patents

Abstract

The present invention relates to an antistatic film, and more specifically, to an antistatic film which is a base film for producing a functional laminated film by interposing with a functional layer, and is excellent in antistatic properties and capable of remarkably lowering frictional static electricity measured in a state in which the functional layer is laminated.

Description

Antistatic Film {ANTISTATIC FILM}

The present invention relates to an antistatic film, and is a base film for producing a functional laminated film by laminating with a functional layer. The antistatic film has excellent antistatic properties and can remarkably lower the frictional static electricity measured in the state where the functional layers are laminated To an antistatic film.

In general, the functional lyophilic film is a film to which functions are imparted to a plastic film as a base material by surface treatment such as coating or vapor deposition, secondary processing such as lamination, functionalization of the base film raw material itself, hybridization or the like. The functional laminated film refers to a material mainly used for energy, packaging, automobiles, household appliances, machine parts, electric parts, and electronic parts. Among them, when it is used for food packaging or electronic material packing, it is widely used by adding a functional layer which complements the respective disadvantages such as oxygen barrier property and light barrier property through secondary processing such as lamination.

In addition, due to the rapid development of various electronic, electrical and information communication fields, there have been problems in static electricity in many fields ranging from industrial appliances and household appliances to which they are applied, and therefore, antistatic function has become an essential function have.

Antistatic means discharging the charge accumulated on the surface of the insulator by an appropriate method.

Where such antistatic property is required, it has been used in electronic devices or static electricity control in film processing processes, but in recent years, static electricity generated in daily life has been controlled. Among them, widely used food packaging or packaging films for electronic materials have problems in that the contents stick to the packaging film (container) due to the static electricity generated when they contain fine powder or fine parts and inconvenience.

As a method for imparting antistatic property to a film, a coating layer is formed on a film by using a water-based coating composition containing a surfactant. The antistatic property of the surfactant type is affected by moisture, Has excellent antistatic performance, but has a characteristic that the antistatic performance is significantly lowered when the surface is not exposed.

An object of the present invention is to provide an antistatic film having a function of controlling frictional static electricity or peeling static electricity without losing the antistatic property even if the antistatic coating layer is not exposed on the surface after the functional layer is laminated on the antistatic film.

Also, an antistatic layer is to be formed by an in-line coating process in order to produce a film of a thin film. In this case, an antistatic film which does not cause clouding during stretching of the film and is excellent in light transmittance and applicable as an optical film is provided .

As a result of research to achieve the above object, it has been found that an antistatic film of a thin film can be produced by applying an antistatic composition having a specific composition to the film by an in-line coating method. Even if the antistatic coating layer is not exposed on the surface, It is possible to provide a film which can control the friction static electricity or the peeling static electricity without losing the film.

Specifically, the present invention relates to a polyester base film and an antistatic layer formed on one or both sides of the polyester base film,

The antistatic layer is formed by applying a water dispersible antistatic composition comprising a dispersion of an acrylic copolymer containing a carboxylic acid ammonium salt group, an amphoteric surfactant, a curing agent and water,

And an antistatic film having a frictional electrostatic reduction rate of 60% or more according to the following formula 1 when at least one or more functional layers are laminated on the antistatic layer to produce a laminated film.

[Equation 1]

Friction static reduction rate = (Friction static value of laminated film excluding antistatic layer - Friction static value of laminated film including antistatic layer) / Friction static value of laminated film except antistatic layer x 100

The antistatic film according to the present invention has antistatic properties without being exposed to the surface of the antistatic coating layer by lapping with the functional layer and can achieve the effect of further lowering the static electricity of friction and can be used for food packaging materials, It can be used as a base film such as a packaging material.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described more fully hereinafter with reference to the accompanying drawings, It should be understood, however, that the invention is not limited thereto and that various changes and modifications may be made without departing from the spirit and scope of the invention.

Unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention is merely intended to effectively describe a specific embodiment and is not intended to limit the invention.

Also, the singular forms as used in the specification and the appended claims are intended to include the plural forms as well, unless the context clearly indicates otherwise.

One aspect of the present invention includes a polyester base film and an antistatic layer formed on one or both sides of the polyester base film,

The antistatic layer is formed by applying a water dispersible antistatic composition comprising a dispersion of an acrylic copolymer containing a carboxylic acid ammonium salt group, an amphoteric surfactant, a curing agent and water,

Is an antistatic film having a frictional electrostatic reduction rate of 60% or more according to the following formula (1) when a laminated film is produced by laminating at least one or more functional layers on the antistatic layer.

[Equation 1]

Friction static reduction rate = (Friction static value of laminated film excluding antistatic layer - Friction static value of laminated film including antistatic layer) / Friction static value of laminated film except antistatic layer x 100

In one embodiment of the present invention, the functional layer may be one or more selected from an inorganic vapor deposition layer, a resin film layer, a metal film layer, a hard coating layer, a pressure-sensitive adhesive layer, a light diffusion layer and a printing layer.

In one embodiment of the present invention, the polyester base film is biaxially stretched and may have a thickness of 12 to 250 占 퐉.

In one embodiment of the present invention, the polyester base film may be a single layer film or a film in which two or more layers are co-extruded and laminated.

In one embodiment of the present invention, the water dispersible antistatic composition comprises 10 to 30% by weight of a dispersion of an acrylic copolymer containing an ammonium carboxylate group, 1 to 10% by weight of an amphoteric surfactant, 1 to 10% by weight of a curing agent, Of water and a total solid content of 10 to 40% by weight.

In one embodiment of the present invention, the antistatic layer may have a dry coating thickness of 10 to 500 nm.

In one embodiment of the present invention, the antistatic layer may have a surface resistance of 10 ⁸ to 10 ¹² Ω / sq.

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

The present inventors have conducted studies to provide an antistatic film having not only antistatic properties but also low friction static electricity even when the antistatic layer is not directly exposed to the surface and other functional layers are laminated, It is possible to achieve this object by using a combination of components. Thus, the present invention has been completed.

Specifically, the first aspect of the present invention is a polyester base film and an antistatic film comprising an antistatic layer on one side of the polyester base film.

A second aspect of the present invention is an antistatic film comprising a polyester base film and an antistatic layer on both sides of the polyester base film.

The above-mentioned aspects are intended to illustrate the present invention in more detail, but are not limited thereto.

In one embodiment of the present invention, the antistatic film may be one in which at least one or more functional layers are laminated depending on the required application by a post-process, and the functional layer may be formed on the antistatic layer. Even if the antistatic layer is not exposed on the surface by laminating the functional layers, the antistatic property is excellent and the friction static electricity is low. That is, when at least one or more functional layers are laminated on the antistatic layer of the antistatic film, it is preferable to set the physical properties such that the frictional static electricity reduction ratio according to the following formula 1 is 60% or more, specifically 60 to 100%, more specifically 60 to 99% It is an antistatic film to be exposed.

[Equation 1]

Friction static reduction rate = (Friction static value of laminated film excluding antistatic layer - Friction static value of laminated film including antistatic layer) / Friction static value of laminated film except antistatic layer x 100

The material of the functional layer is not limited because it may vary depending on the application. For example, an inorganic vapor deposition layer, a resin film layer, a metal film layer, a hard coating layer, a pressure sensitive adhesive layer, a light diffusion layer and a printing layer can be used. These may be laminated at least one layer or two or more layers. The thickness of the functional layer is not limited. For example, the total thickness of the functional layer may be 0.1 to 100 占 퐉, more preferably 10 to 50 占 퐉. In the formula 1, the frictional static electricity reduction rate may be 60% or more when the thickness of the functional layer laminated on the laminated film is 10 to 50 탆, and when the thickness of the functional layer is more than 50 탆, The static reduction rate may be lowered.

The inorganic vapor deposition layer may be a functional layer for blocking moisture or light, and may include, for example, ITO, IZO, SiOx, and AlOx, but is not limited thereto. The resin film layer may be a food packaging film or an electronic material packaging film. Specific examples thereof include a polyester film, a nylon film, a polyolefin film, an ethylene vinyl acetate film, an ionomer film and an ethylene vinyl alcohol copolymer (EVOH) film And the like may be used, but the present invention is not limited thereto. The metal film layer may be made of aluminum foil, copper foil, stainless steel foil, or the like, but is not limited thereto.

The structure of each layer will be described more specifically.

(1) Polyester base film

More specifically, the polyester base film of the present invention will be described.

In the present invention, the polyester base film may be a monolayer film, or a laminated film composed of two or more layers including a core layer and a skin layer having at least one layer laminated on one or both sides of the core layer. Or may be formed by coextrusion. The production of the polyester laminated film including the core layer and the skin layer is not limited, but can be obtained by casting after extrusion melt-extrusion in at least two melt extruders and by biaxial stretching. More specifically, the polyester is extruded from one extruder, and the additives such as polyester and inorganic particles such as silica, kaolin, and zeolite are melt-extruded at the same time in another extruder, and then the respective melts meet in the feed block, To prepare an unoriented sheet, and then sequentially biaxially stretching to produce a film.

The thickness of the polyester base film is preferably from 12 to 250 탆 for the optical film, more preferably from 25 to 188 탆, but is not limited thereto.

The polyester base film may include inorganic particles, and inorganic particles such as silica, zeolite, kaolin and the like may be used in the film. Such an inorganic particle is allowed to come out to the surface of the film through a stretching process to improve slipperiness and windability of the film.

(2) Antistatic layer

The present invention includes an antistatic layer on one side or both sides of the polyester base film.

The antistatic layer may be formed by applying a water-dispersible antistatic composition comprising a dispersion of an acrylic copolymer containing a carboxylic acid ammonium salt group, an amphoteric surfactant, a curing agent and water. In the production process of the polyester base film In-line, dried, and dried to form a coating film.

The antistatic layer of the present invention is characterized by a combination of each constitution of the water dispersible antistatic composition.

The dispersion of the acrylic copolymer containing the carboxylic acid ammonium salt group is used as an antistatic agent exhibiting antistatic properties by lowering the surface resistance, and has an effect of exhibiting excellent antistatic property even if the antistatic layer is not directly exposed to the surface.

The acrylic copolymer containing the ammonium carboxylate group has a carboxyl (-COO ^- ) reactor attached to the main chain of the acrylic copolymer as shown in Chemical Formula 1 below, and an antistatic agent having a quaternary ammonium compound attached to the carboxyl group The quaternary ammonium antistatic agent is adhered to the main chain and has an excellent surface resistance. The carboxyl group can be cured by a curing agent such as epoxy or melamine due to the carboxyl group. The carboxyl group content may be 1 to 20 wt% of the total weight of the acrylic copolymer resin, but is not limited thereto.

[Chemical Formula 1]

(In the formula (1), R ₁ to R ₃ each independently may be C ₁ -C ₂₀ alkyl, C ₆ -C ₂₀ aryl and C ₆ -C ₃₀ aryl C ₁ -C ₃₀ alkyl.)

The alkyl includes a linear or branched saturated monovalent hydrocarbon radical consisting solely of a carbon atom and a hydrogen atom or a combination thereof and the aryl is an organic radical derived from an aromatic hydrocarbon by one hydrogen elimination, Includes a single or fused ring system, suitably containing from 4 to 7, preferably 5 or 6, ring atoms. Also included are structures in which one or more aryls are attached via chemical bonds. Specific examples include, but are not limited to, phenyl, naphthyl, biphenyl, anthryl, indenyl, fluorenyl, and the like.

The solid content of the acrylic copolymer in the dispersion is not limited, but may be 10 to 50% by weight, more preferably 20 to 40% by weight, and may be dispersed in water or a mixed solvent of water and alcohol.

Specific examples of the commercialization include, but are not limited to, Bondeip PA100 manufactured by Konishi Co., Ltd., and the like. The PA100 is an emulsion type in which the acrylic copolymer resin has a solid content of 30 wt% and is dispersed in a mixed solvent of isopropyl alcohol and water mixed at a weight ratio of 2: 1.5. The carboxyl group content is 8 to 12 wt% when the resin is 100 wt%.

The content of the dispersion of the acrylic copolymer may be 10 to 50% by weight, more preferably 15 to 30% by weight, in the water-dispersible antistatic composition. Within this range, the antistatic property is excellent, An antistatic layer of a thin film having a thickness of 500 nm to 500 nm can be formed.

The amphoteric surfactant is a surfactant having both a cationic group and an anionic group, for example, a zwitterion compound having both a positive charge and a negative charge in the same molecule. Examples of zwitterionic compounds include, but are not limited to, alkyl betaines and amido alkyl betaines.

By using the amphoteric surfactant in combination with the dispersion of the acrylic copolymer containing the ammonium carboxylate group, the initial surface resistance is further reduced, the coating appearance after coating and stretching is further improved, and the friction coefficient is further lowered . The weight average molecular weight of the amphoteric surfactant is not limited, but it may be 500 to 5000 g / mol, more preferably 1000 to 3000 g / mol. Commercial examples include, but are not limited to, UNISTAT 3PN (molecular weight 2,000 to 3,000 g / mol, solid content 18.5% by weight) of beta-phosphorous amphoteric antistatic agent sychem. The content thereof may be 1 to 10% by weight, more preferably 2 to 8% by weight, of the water-dispersible antistatic composition, and is preferable since it is sufficient to achieve the intended effect in the above range.

The curing agent can be used without limitation as long as it can cure the antistatic agent to form a coating film. Specifically, for example, an epoxy curing agent, a melamine curing agent, a benzoguanamine resin, and the like can be used. As an example of the epoxy curing agent, diethylene glycol diglycidyl ether, glycerin diglycidyl ether, bisphenol A diglycidyl ether, trimethylol propane tri diglycidyl ether and the like can be used. Specific examples of the melamine-based curing agent include trimethylol melamine, hexamethylol melamine, trismethoxymethyl melamine, hexakis methoxymethyl melamine, and the like.

More preferably, when a melamine-based curing agent is used, it is possible to prevent the occurrence of clouding during stretching in the width direction, but is not limited thereto. Specifically, for example, BECKAMINE-J101 which is a 30% aqueous solution of hexamethylol melamine curing agent manufactured by Dai-Nippon Ink & Chemicals, Inc. (DIC) can be used. The content thereof may be 1 to 10% by weight, more preferably 2 to 8% by weight, of the water-dispersible antistatic composition, and is preferable since it is sufficient to achieve the intended effect in the above range.

The water-dispersible antistatic composition may contain water and may be used by adjusting the solid content according to the coating thickness. When the total solid content excluding water is in the range of 10 to 40% by weight, An antistatic layer having a coating thickness can be formed.

Further, if necessary, it may further comprise a silicone-based wetting agent, a fluorine-based wetting agent, a slip agent, a defoaming agent, a wetting agent, a surfactant, a thickener, a plasticizer, an antioxidant, an ultraviolet absorber, a preservative,

The wetting agent is used for improving the coating property. Specific examples thereof include Q2-5212 of Dow Corning, TEGO WET 250 of ENBODIC, modified silicone based wetting agent such as BYK 348 of BYK CHEMIE, and fluorinated A wetting agent, and the like may be used, but the present invention is not limited thereto. The wetting agent is preferably used in an amount of 0.1 to 2% by weight, and the intended coating property can be improved within the above range.

The thickness of the antistatic layer is not limited, but may be 10 to 500 nm, more preferably 50 to 500 nm, and is sufficient to exhibit antistatic properties in the above range.

In the present invention, the antistatic composition may be applied by an inline coating method during a polyester base film production process. In other words, it can be produced by applying an inline coating method before stretching in the production of a polyester base film or a second stretching method after the first stretching, and then stretching. In the second stretching and heat fixing process, water evaporates due to heating, An anti-blocking layer may be formed. The application method is not limited as long as it is a known application method.

The antistatic film of the present invention may have a surface resistance of the antistatic layer of 10 ⁸ to 10 ¹² Ω / sq, but is not limited thereto.

The antistatic film of the present invention can be treated on the opposite side where the antistatic coating layer is formed and on the antistatic coating layer, if necessary, such as corona. The corona treatment method and conditions are not limited.

Hereinafter, the present invention will be described in more detail based on examples and comparative examples. However, the following examples and comparative examples are merely examples for explaining the present invention in more detail, and the present invention is not limited by the following examples and comparative examples.

1) Surface resistance

 The surface resistance of the antistatic layer of the present invention was evaluated. The measurement method is described in Mitsubishi Chemical Corp. The surface resistivity was measured using a Hiresta-Up MCP-HP450 instrument under the conditions of 25 ° C, 50% RH, 500V, and 10 seconds.

2) Measurement of coating thickness

The coating thickness was measured using a TEM instrument.

3) Friction Static Electricity (Friction Voltage)

The measurement was carried out at 25 ° C, 50% Rh, laminating film and cotton with a force of 4.9N using a DAIEI KAGAKU SEIKI MFG Co., LTD and a Rotary Static Tester (RST-300A) And the static electricity generated at that time was recorded.

The friction static of the antistatic film and the antistatic film were measured, and the friction static of the antistatic film was measured, and the friction film of the functional film laminated on the antistatic layer was measured.

① The film was cut to 50 × 80 mm and the initial static electricity of the surface was measured. It was confirmed that the initial static electricity was 0 volt.

(2) The surface of the film is rubbed with a cotton cloth for 1 minute. Rubbing was performed at a pressure of 4.9 N and 400 rpm for 1 minute.

③ Frictional static electricity was measured.

[Preparation Example 1] Preparation of water dispersible antistatic composition (1)

15 wt% of Bondeip PA100 (solid content 30 wt%) manufactured by Konishi Co., Ltd., and 75 wt% of water were put into a mixing container as a dispersion of an acrylic copolymer containing a carboxylic acid ammonium salt group and stirred for 1 hour. 5 wt% of UNISTAT 3PN from Sychem Co. was further added to the mixing vessel as an amphoteric surfactant and stirred again for 1 hour. 4 wt% of BECKAMINE-J101 manufactured by DIC Co., Ltd. was added thereto as a melamine-based curing agent and re-crosslinked for 30 minutes. 1 wt% BYK yarn and BYK 348 were added as a silicon-based weighting agent to the mixing vessel and further stirred for 1 hour to obtain a water- ).

[Preparation Example 2] Preparation of water dispersible antistatic composition (2)

30 wt% of Bondeip PA100 (solid content 30 wt%) manufactured by Konishi Co., Ltd., and 50 wt% of water were put in a mixing container as a dispersion of an acrylic copolymer containing a carboxylic acid ammonium salt group and stirred for 1 hour. 10 wt% of UNISTAT 3PN from SY Chem Co., Ltd. as an amphoteric surfactant was further added to the mixing vessel and stirred again for 1 hour. 8 wt% of BECKAMINE-J101 manufactured by DIC Co., Ltd. was added thereto as a melamine-based curing agent and re-crosslinked for 30 minutes. 2 wt% BYK yarn and BYK 348 were added as a silicone-based wetting agent to the mixing vessel and further stirred for 1 hour to obtain a water dispersible antistatic composition ).

[Comparative Preparation Example 1] Preparation of water dispersible antistatic composition (3)

12% by weight of Primal-3208 (solid content 44% by weight) of Rohm and Haas Company and 8% by weight of SY Chem, UNISTA 3PN and 79% by weight of an amphoteric antistatic agent were mixed in an acrylic water dispersion and stirred for 30 minutes. 1 wt% of BYK 348 and BYK 345 as a silicone-based wetting agent were added and further stirred for 1 hour to prepare a water-dispersible antistatic composition (3).

[Comparative Preparation Example 2] Preparation of water dispersible antistatic composition (4)

(Molecular weight: 100,000 g / mol, solids content: 25.5% by weight) as an anionic high molecular weight antistatic agent; 17.45 wt% and 70.65 wt% of water were put into a mixing container and stirred for 30 minutes. 1 wt% of BYK 348 and BYK 345 as a silicone-based wetting agent were added and further stirred for 1 hour to prepare a water-dispersible antistatic composition (4).

[Example 1]

1) Preparation of Antistatic Film

A polyethylene terephthalate chip and 50 ppm of silica particles having an average particle diameter of 0.7 탆 were melt-extruded to prepare an unoriented sheet. The unstretched sheet was stretched three times in the machine direction (MD) at 120 캜. Thereafter, the water dispersible antistatic composition (1) prepared in Preparation Example 1 was coated on one side by a bar coating method, preheated to 150 캜 and dried, and stretched 4.1 times in the transverse direction (TD). Thereafter, the film was heat-treated at 230 ° C in a 5-stage tenter, and relaxed by 10% in longitudinal and transverse directions at 200 ° C to prepare a biaxially oriented film of 25 μm coated on one surface.

The dry coating thickness of the antistatic layer was 100 nm.

2) Manufacture of laminated film

An acrylic adhesive (KAN-HWASUNG, KUB-338S, adhesive solid content: 25 wt%) was coated on the antistatic layer surface of the antistatic film to a thickness of 3 탆 using a # 4 bar coater and dried at 140 캜 for 30 seconds, A polyethylene terephthalate film having a thickness of 25 mu m was laminated on the adhesive layer, and the laminate was laminated by applying a pressure of 0.4 MPa at 120 DEG C using a laminator (Model Digital 360).

[Example 2]

An antistatic film was prepared in the same manner as in Example 1, except that the water-dispersible antistatic composition (2) prepared in Preparation Example 2 was used so that the antistatic layer had a dry coating thickness of 250 nm. , And a laminated film was produced in the same manner as in Example 1.

[Example 3]

An antistatic film similar to that of Example 1 was used, and a laminate film was prepared in the same manner as in Example 1, except that a polyethylene terephthalate film having a thickness of 15 탆 was used in producing a laminate film.

[Example 4]

The same antistatic film as in Example 1 was used and a laminate film was prepared in the same manner as in Example 1, except that a polyethylene terephthalate film having a thickness of 50 탆 was used in the production of a laminate film.

[Example 5]

An antistatic film was prepared in the same manner as in Example 1, except that the water-dispersible antistatic composition (2) prepared in Preparation Example 2 was used so that the antistatic layer had a dry coating thickness of 250 nm. , And a polyethylene terephthalate film having a thickness of 15 mu m was used instead of the polyethylene terephthalate film.

[Example 6]

An antistatic film was prepared in the same manner as in Example 1, except that the water-dispersible antistatic composition (2) prepared in Preparation Example 2 was used so that the antistatic layer had a dry coating thickness of 250 nm. , And a polyethylene terephthalate film having a thickness of 50 占 퐉 was used as an adhesive layer.

[Comparative Example 1]

A polyester film was produced in the same manner as in Example 1 except that no antistatic layer was formed.

Thereafter, the lidding film was prepared in the same manner as in Example 1.

[Comparative Example 2]

A polyester film of Comparative Example 1 in which an antistatic layer was not formed was used and a laminate film was prepared in the same manner as in Example 1, except that a polyethylene terephthalate film having a thickness of 15 탆 was used in producing a laminate film.

[Comparative Example 3]

A laminated film was prepared in the same manner as in Example 1 except that the polyester film of Comparative Example 1 in which an antistatic layer was not formed was used and a polyethylene terephthalate film having a thickness of 50 탆 was used in the production of a laminated film.

[Comparative Example 4]

An antistatic film was prepared in the same manner as in Example 1, except that the water dispersible antistatic composition (3) prepared in Comparative Preparation Example 1 was used in the production of the antistatic film.

Thereafter, the lidding film was prepared in the same manner as in Example 1.

[Comparative Example 5]

An antistatic film was prepared in the same manner as in Example 1, except that the water dispersible antistatic composition (4) prepared in Comparative Preparation Example 2 was used in the production of the antistatic film.

Thereafter, the lidding film was prepared in the same manner as in Example 1.

Antistatic film Laminating film Antistatic layer Antistatic layer thickness (nm) Functional layer type Functional layer thickness (탆) Example 1 Production Example 1 100 PET film 25 Example 2 Production Example 2 250 PET film 25 Example 3 Production Example 1 100 PET film 15 Example 4 Production Example 1 100 PET film 50 Example 5 Production Example 2 250 PET film 15 Example 6 Production Example 2 250 PET film 50 Comparative Example 1 - - PET film 25 Comparative Example 2 - - PET film 15 Comparative Example 3 - - PET film 50 Comparative Example 4 Comparative Preparation Example 1 100 PET film 25 Comparative Example 5 Comparative Production Example 2 100 PET film 25

Surface resistance
(Ω / □) Friction Static (kV) Antistatic film Laminating film Friction Static Reduction Rate of Laminating Film (%) Example 1 1.35E + 09 0 0.56 87.56 Example 2 3.58E + 08 0 0.12 97.33 Example 3 1.35E + 09 0 0.12 97.33 Example 4 1.25E + 09 0 1.12 75.11 Example 5 3.55E + 08 0 0.02 99.56 Example 6 3.45E + 08 0 0.89 80.22 Comparative Example 1 OVER 4.5 4.5 0 Comparative Example 2 OVER 4.55 4.55 0 Comparative Example 3 OVER 4.57 4.57 0 Comparative Example 4 2.97E + 08 0 4.35 3.33 Comparative Example 5 1.68E + 09 0 2.98 33.78

As shown in Table 2, when the antistatic film of the present invention was compared with Comparative Example 1 and Examples 1 and 2, the frictional static reduction rate of the laminated film was 87.56 % ≪ / RTI > From these results, it was found that the antistatic layer exhibited excellent antistatic properties without being exposed to the surface. As shown in Example 1 and Example 2, it was found that the frictional static reduction rate increased as the thickness of the antistatic layer was thicker.

[Example 7]

The same antistatic film as in Example 1 was used and the same as Example 1 except that a nylon film (Kolon Industries, CNR01) having a thickness of 19 占 퐉 was used instead of a 25 占 퐉 thick polyethylene terephthalate film Lt; / RTI >

[Example 8]

An antistatic film was prepared in the same manner as in Example 1, except that the water-dispersible antistatic composition (2) prepared in Preparation Example 2 was used so that the antistatic layer had a dry coating thickness of 250 nm. , And a nylon film (Kolon Industries, CNR01) having a thickness of 19 占 퐉 was used instead of the polyethylene terephthalate film having a thickness of 25 占 퐉.

[Comparative Example 6]

Except that a polyester film of Comparative Example 1 in which the antistatic layer was not formed was used and a nylon film (CNR01, manufactured by Kolon Industries, Ltd.) having a thickness of 19 mu m was used in the production of a laminate film, Respectively.

[Comparative Example 7]

An antistatic film was prepared in the same manner as in Example 1, except that the water dispersible antistatic composition (3) prepared in Comparative Preparation Example 1 was used in the production of the antistatic film.

A laminate film was prepared in the same manner as in Example 1, except that a nylon film (Kolon Industries, CNR01) having a thickness of 19 탆 was used in the production of a laminate film.

[Comparative Example 8]

An antistatic film was prepared in the same manner as in Example 1, except that the water dispersible antistatic composition (4) prepared in Comparative Preparation Example 2 was used in the production of the antistatic film.

A laminate film was prepared in the same manner as in Example 1, except that a nylon film (Kolon Industries, CNR01) having a thickness of 19 탆 was used in the production of a laminate film.

Antistatic film Laminating film Antistatic layer Antistatic layer thickness (nm) Functional layer type Functional layer thickness (탆) Example 7 Production Example 1 100 Nylon film 19 Example 8 Production Example 2 250 Nylon film 19 Comparative Example 6 - - Nylon film 19 Comparative Example 7 Comparative Preparation Example 1 100 Nylon film 19 Comparative Example 8 Comparative Production Example 2 100 Nylon film 19

Surface resistance (Ω / □) Friction Static (kV) Antistatic film Laminating film Friction Static Reduction Rate of Laminating Film (%) Example 7 1.07E + 09 0 0.04 97.40 Example 8 3.25E + 08 0 0.05 96.75 Comparative Example 6 OVER 4.55 1.54 0 Comparative Example 7 2.87E + 08 0 1.52 1.30 Comparative Example 8 1.67E + 09 0 1.02 33.77

As shown in Table 4, when the antistatic film of the present invention was used, it was confirmed that frictional static electricity was significantly reduced as compared with Comparative Example 6 in which no antistatic layer was formed.

[Example 9]

The same antistatic film as in Example 1 was used, and in the same manner as in Example 1, except that a polyethylene film having a thickness of 50 탆 (Dupont, PV5400) was used instead of a 25 탆 thick polyethylene terephthalate film A laminated film was prepared.

[Example 10]

An antistatic film was prepared in the same manner as in Example 1, except that the water-dispersible antistatic composition (2) prepared in Preparation Example 2 was used so that the antistatic layer had a dry coating thickness of 250 nm. , And a 50 탆 thick ionomer film (Dupont, PV5400) was used instead of the polyethylene terephthalate film having a thickness of 25 탆.

[Comparative Example 9]

A polyester film of Comparative Example 1 in which an antistatic layer was not formed was used and a laminate film was produced in the same manner as in Example 1, except that an ionomer film (Dupont, PV5400) having a thickness of 50 탆 was used in producing a laminate film .

[Comparative Example 10]

An antistatic film was prepared in the same manner as in Example 1, except that the water dispersible antistatic composition (3) prepared in Comparative Preparation Example 1 was used in the production of the antistatic film.

A laminate film was prepared in the same manner as in Example 1, except that an ionomer film (Dupont, PV5400) having a thickness of 50 탆 was used in the production of a laminate film.

[Comparative Example 11]

An antistatic film was prepared in the same manner as in Example 1, except that the water dispersible antistatic composition (4) prepared in Comparative Preparation Example 2 was used in the production of the antistatic film.

A laminate film was prepared in the same manner as in Example 1, except that an ionomer film (Dupont, PV5400) having a thickness of 50 탆 was used in the production of a laminate film.

Antistatic film Laminating film Antistatic layer Antistatic layer thickness (nm) Functional layer type Functional layer thickness (탆) Example 9 Production Example 1 100 Ionomer film 50 Example 10 Production Example 2 250 Ionomer film 50 Comparative Example 9 - - Ionomer film 50 Comparative Example 10 Comparative Preparation Example 1 100 Ionomer film 50 Comparative Example 11 Comparative Production Example 2 100 Ionomer film 50

Surface resistance (Ω / □) Friction Static (kV) Antistatic film Laminating film Friction Static Reduction Rate of Laminating Film (%) Example 9 1.15E + 09 0 1.52 66.07 Example 10 3.38E + 08 0 0.89 80.13 Comparative Example 9 OVER 4.57 4.48 0 Comparative Example 10 2.56E + 08 0 4.52 0.89 Comparative Example 11 1.62E + 09 0 3.85 14.06

Claims (7)

A polyester base film and an antistatic layer formed on one or both sides of the polyester base film,
The antistatic layer is formed by applying a water dispersible antistatic composition comprising a dispersion of an acrylic copolymer containing a carboxylic acid ammonium salt group, an amphoteric surfactant, a curing agent and water,
Wherein an antistatic film has at least one functional layer laminated on the antistatic layer to produce a laminated film, wherein the antistatic film has a frictional electrostatic reduction ratio of 60% or more according to the following formula (1).
[Formula 1]
Friction static reduction rate = (Friction static value of laminated film excluding antistatic layer - Friction static value of laminated film including antistatic layer) / Friction static value of laminated film except antistatic layer x 100 The method according to claim 1,
Wherein the functional layer is one or more selected from an inorganic vapor deposition layer, a resin film layer, a metal film layer, a hard coating layer, a pressure-sensitive adhesive layer, a light diffusion layer and a printing layer. The method according to claim 1,
Wherein the polyester base film is biaxially stretched and has a thickness of 12 to 250 占 퐉. The method according to claim 1,
Wherein the polyester base film is a single layer film or a film in which two or more layers are co-extruded and laminated. The method according to claim 1,
The water dispersible antistatic composition comprises 10 to 30% by weight of a dispersion of an acrylic copolymer containing a carboxylic acid ammonium salt group, 1 to 10% by weight of an amphoteric surfactant, 1 to 10% by weight of a curing agent and a residual amount of water, And a solids content of 10 to 40% by weight. The method according to claim 1,
Wherein the antistatic layer has a dry coating thickness of 10 to 500 nm. The method according to claim 1,
Wherein the antistatic layer has a surface resistance of 10 ⁸ to 10 ¹² Ω / sq.