KR102589137B1 - Antistatic film - Google Patents

Abstract

The present invention relates to an antistatic film. It is a base film for producing a functional laminated film by lamination with a functional layer. It has excellent antistatic properties and can significantly reduce the tribostatic measured in the state in which the functional layer is laminated. It is about anti-static film.

Description

Anti-static film {ANTISTATIC FILM}

The present invention relates to an antistatic film. It is a base film for producing a functional laminated film by lamination with a functional layer. It has excellent antistatic properties and can significantly reduce the tribostatic measured in the state in which the functional layer is laminated. It is about anti-static film.

In general, a functional laminated film is a film in which functions are given to the plastic film that serves as the base material through surface treatment such as coating or deposition, secondary processing such as lamination, or functionalization or hybridization of the base film raw material itself. The functional laminated film refers to materials mainly used in energy, packaging, automobiles, home appliances, mechanical parts, electrical parts, and electronic parts. Among these, when used for food packaging or electronic material packaging, it is widely used by adding a functional layer that complements each disadvantage such as oxygen blocking and light blocking through secondary processing such as laminate.

In addition, with the recent rapid development of various electronics, electricity, and information and communication fields, problems due to static electricity have occurred in many fields ranging from industrial products to household products to which it is applied, causing inconvenience in use, so the anti-static function has emerged as an essential function. there is.

Antistatic refers to discharging the charges accumulated on the surface of an insulator in an appropriate manner.

Places that require such anti-static properties have been used to control static electricity that appears in electronic devices or film processing processes, but recently, it has also expanded to control static electricity that occurs in everyday life. Among them, the widely used laminated film for food packaging or electronic material packaging has the problem of causing inconvenience by causing the contents to stick to the packaging film (container) due to static electricity generated when used to contain fine powder or fine parts.

A method of providing anti-static performance to a film is to form a coating layer on the film using a water-based coating composition containing a surfactant. Surfactant-type anti-static performance is greatly affected by moisture, so the surface of the coating layer is exposed. The anti-static performance is excellent, but when the surface is not exposed, the anti-static performance is significantly reduced.

The present invention seeks to provide an antistatic film that has the functionality of controlling tribostatic or peeling static electricity without losing antistatic performance even when the antistatic coating layer is not exposed to the surface after combining the functional layer with the antistatic film.

In addition, in order to manufacture a thin film, we intend to form an antistatic layer through an in-line coating process. At this time, we aim to provide an antistatic film that does not generate white turbidity during the stretching process of the film, has excellent light transmittance, and can be applied as an optical film. .

As a result of research to achieve the above purpose, it was possible to manufacture a thin anti-static film by applying an anti-static composition of a specific composition and manufacturing the film using an in-line application method, and anti-static performance was achieved even when the anti-static coating layer was not exposed to the surface. The present invention was completed by discovering that it is possible to provide a film that can control tribostatic or peeling static electricity without losing the static electricity.

Specifically, 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 containing a dispersion of an acrylic copolymer containing an ammonium carboxylate base, an amphoteric surfactant, a curing agent, and water,

It relates to an antistatic film having a tribostatic reduction rate of 60% or more according to Equation 1 below when a laminated film is manufactured by laminating at least one functional layer on the antistatic layer.

[Equation 1]

Tribostatic reduction rate = (tribostatic value of the laminated film excluding the antistatic layer - tribostatic value of the laminated film including the antistatic layer)/tribostatic value of the laminated film excluding the antistatic layer × 100

The antistatic film according to the present invention has antistatic properties even if the antistatic coating layer is not exposed to the surface by lamination with a functional layer, and can achieve the effect of further reducing friction static electricity, and can be used in food packaging, drug packaging, and electronic products. It can be used as a base film for packaging materials, etc.

Hereinafter, the present invention will be described in more detail through specific examples or examples including the attached drawings. However, the following specific examples or examples are only a reference for explaining the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Additionally, 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 the present invention pertains. The terminology used in the description herein is merely to effectively describe specific embodiments and is not intended to limit the invention.

Additionally, as used in the specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to also include the plural forms, unless the context clearly dictates 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 containing a dispersion of an acrylic copolymer containing an ammonium carboxylate base, an amphoteric surfactant, a curing agent, and water,

When a laminated film is manufactured by laminating at least one functional layer on the antistatic layer, the antistatic film has a tribostatic reduction rate of 60% or more according to Equation 1 below.

[Equation 1]

Tribostatic reduction rate = (tribostatic value of the laminated film excluding the antistatic layer - tribostatic value of the laminated film including the antistatic layer)/tribostatic value of the laminated film excluding the antistatic layer × 100

In one aspect of the present invention, the functional layer may be a stack of any one or two or more selected from an inorganic deposition layer, a resin film layer, a metal film layer, a hard coating layer, an adhesive layer, a light diffusion layer, and a printing layer.

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

In one aspect 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 aspect of the present invention, the water-dispersible antistatic composition includes 10 to 30% by weight of an acrylic copolymer dispersion containing an ammonium carboxylate base, 1 to 10% by weight of an amphoteric surfactant, 1 to 10% by weight of a curing agent, and the balance. It may contain water and have a total solid content of 10 to 40% by weight.

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

In one aspect 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 studied to provide an antistatic film with not only antistatic properties but also low tribostatic properties even when the antistatic layer is not directly exposed to the surface and other functional layers are laminated, and as a result, it was identified as an antistatic composition. The present invention was completed by discovering that this purpose can be achieved by using a combination of ingredients.

Specifically, the first aspect of the present invention is an antistatic film comprising a polyester base film and an antistatic layer on one surface 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 aspects are merely illustrative to explain the present invention in more detail and are not limited thereto.

In one aspect of the present invention, the antistatic film may be one in which at least one or more functional layers are laminated in a post-process depending on the intended use, and the functional layer may be formed on the antistatic layer. Even if the antistatic layer is not exposed to the surface by laminating the functional layer, it has excellent antistatic properties and low friction static electricity. That is, when at least one functional layer is laminated on the antistatic layer of the antistatic film, the tribostatic reduction rate according to Equation 1 below is 60% or more, specifically 60 to 100%, and more specifically 60 to 99%. It is an anti-static film that develops.

[Equation 1]

Tribostatic reduction rate = (tribostatic value of the laminated film excluding the antistatic layer - tribostatic value of the laminated film including the antistatic layer)/tribostatic value of the laminated film excluding the antistatic layer × 100

The material of the functional layer may vary depending on the purpose and is therefore not limited. For example, an inorganic deposition layer, a resin film layer, a metal film layer, a hard coating layer, an adhesive layer, a light diffusion layer, a printing layer, etc. may be used. These may be stacked in at least one or two layers. Additionally, the thickness of the functional layer is not limited, and for example, the total thickness of the functional layer may be 0.1 to 100 ㎛, more preferably 10 to 50 ㎛. In Equation 1, based on the fact that the thickness of the functional layer laminated on the laminated film is 10 to 50 ㎛, the tribostatic reduction rate may be 60% or more, and if the thickness of the functional layer is more than 50 ㎛, the friction The static electricity reduction rate may be lowered.

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

The configuration of each layer will be described in more detail.

(1) Polyester base film

In more detail, the polyester base film of the present invention will be described.

In the present invention, the polyester base film may be a single-layer film or a laminated film consisting of two or more layers, including a core layer and a skin layer in which at least one layer is laminated on one or both sides of the core layer, It may be formed by co-extrusion. The production of the polyester laminated film including the core layer and the skin layer is not limited, but can be obtained by extrusion and melting in at least two or more melt extruders, casting, and biaxial stretching. To be more specific, polyester is extruded in one extruder, polyester and additives such as inorganic particles such as silica, kaolin, and zeolite are melted and extruded simultaneously in another extruder, and then each melt meets at a feed block and is co-extruded. An unstretched sheet may be manufactured, and a film may be manufactured by sequential biaxial stretching.

The thickness of the polyester base film is preferably 12 to 250㎛ when applied as an optical film, and more preferably 25 to 188㎛, but is not limited thereto.

The polyester base film may contain inorganic particles, and the inorganic particles may be any particles used in the film, such as silica, zeolite, kaolin, etc. These inorganic particles come out to the surface of the film through the stretching process and can improve the slip properties and winding properties of the film.

(2) Anti-static layer

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

The antistatic layer may be formed by applying a water-dispersible antistatic composition containing a dispersion of an acrylic copolymer containing an ammonium carboxylate base, an amphoteric surfactant, a curing agent, and water, during the manufacturing process of the polyester base film. It may be applied in-line and dried during the stretching and heat setting process to form a coating film.

The antistatic layer of the present invention is characterized by the combination of each component forming the water-dispersible antistatic composition.

The dispersion of the acrylic copolymer containing the ammonium carboxylate base is used as an antistatic agent that exhibits antistatic properties by lowering surface resistance, and has the effect of exhibiting excellent antistatic properties even if the antistatic layer is not directly exposed to the surface.

The acrylic copolymer containing the ammonium carboxylic acid base has a carboxyl (-COO ^- ) reactive group attached to the main chain of the acrylic copolymer as shown in Chemical Formula 1 below, and is an antistatic agent in which a quaternary ammonium compound is attached to the carboxyl reactive group. As a quaternary ammonium antistatic agent is attached to the main chain, it has excellent surface resistance, and due to the carboxyl reactive group, it can be cured with a curing agent such as epoxy or melamine to form a coating film. The carboxyl group content may be 1 to 20% by weight of the total weight of the acrylic copolymer resin, but is not limited thereto.

[Formula 1]

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

The alkyl includes a straight-chain or branched chain saturated monovalent hydrocarbon radical consisting of only carbon atoms and hydrogen atoms, or a combination thereof, and aryl is an organic radical derived from an aromatic hydrocarbon by removal of one hydrogen, and each ring Suitably includes a single or fused ring system containing 4 to 7 ring atoms, preferably 5 or 6 ring atoms. It also includes structures in which one or more aryls are bonded through chemical bonds. Specific examples include, but are not limited to, phenyl, naphthyl, biphenyl, anthryl, indenyl, fluorenyl, etc.

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

The content of the dispersion of the acrylic copolymer may be 10 to 50% by weight, more preferably 15 to 30% by weight, of the water-dispersible antistatic composition, and within the above range, antistatic properties are excellent while at the same time the dry application thickness is 10%. A thin antistatic layer of ~500 nm can be formed.

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

By mixing the amphoteric surfactant with the dispersion of the acrylic copolymer containing the ammonium carboxylate base, the initial surface resistance is further lowered, the coating appearance is further improved after coating and stretching, and the friction coefficient is further lowered. You can. The weight average molecular weight of the amphoteric surfactant is not limited, but can be used in the range of 500 to 5000 g/mol, more preferably 1000 to 3000 g/mol. A commercialized example is Sychem's UNISTAT 3PN (molecular weight 2,000-3,000 g/mol, solid content 18.5% by weight), a betaine-based amphoteric antistatic agent, but is not limited thereto. The content may be 1 to 10% by weight, more preferably 2 to 8% by weight, of the water-dispersible antistatic composition, and is preferred because the above range is sufficient to achieve the desired effect.

The curing agent may be used without limitation as long as it can form a coating film by curing the antistatic agent. Specifically, for example, epoxy-based curing agents, melamine-based curing agents, benzoguanamine resins, etc. may be used. One embodiment of the epoxy-based curing agent may be diethylene glycol diglycidyl ether, glycerin diglycidyl ether, bisphenol A diglycidyl ether, trimethylolpropane tridiglycidyl ether, etc. Specific examples of the melamine-based curing agent include trimethylolmelamine, hexamethylolmelamine, trismethoxymethylmelamine, and hexakismethoxymethylmelamine.

More preferably, when using a melamine-based curing agent, it is good to prevent white turbidity from occurring during stretching in the width direction, but is not limited to this. Specific commercialized examples include BECKAMINE-J101, a 30% aqueous solution of hexamethylol melamine curing agent manufactured by Dai Nippon Ink Chemical Co., Ltd. (DIC), but are not limited thereto. The content may be 1 to 10% by weight, more preferably 2 to 8% by weight, of the water-dispersible antistatic composition, and is preferred because the above range is sufficient to achieve the desired effect.

The water-dispersible antistatic composition contains water, and may be used by adjusting the solid content depending on the application thickness. When applied to the in-line application process, the total solid content excluding water is within the range of 10 to 40% by weight. This is preferable because it is possible to form an antistatic layer with a single coating thickness.

In addition, if necessary, it may further include a silicone-based wetting agent, a fluorine-based wetting agent, a slip agent, an antifoaming agent, a wetting agent, a surfactant, a thickener, a plasticizer, an antioxidant, an ultraviolet absorber, a preservative, a crosslinking agent, etc.

The wetting agent is used to improve coating properties, and specifically, for example, modified silicone-based wetting agents such as Q2-5212 from Dow Corning, TEGO WET 250 from ENBODIC, and BYK 348 from BYK CHEMIE, and fluorine-based wetting agents such as FSH from Zonyl. Wetting agents, etc. may be used, but are not limited thereto. The wetting agent is preferably used in an amount of 0.1 to 2% by weight, and the desired coating property improvement can be achieved within the above range.

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

In the present invention, the antistatic composition may be applied by an in-line application method during the polyester base film manufacturing process. That is, when manufacturing a polyester base film, it can be manufactured by applying it using an in-line coating method before stretching or after primary stretching and before secondary stretching, and then stretching. During the secondary stretching and heat setting, water evaporates by heating and becomes charged. A protective 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 with corona or the like as needed on the opposite side where the antistatic coating layer is formed and on the top of the antistatic coating layer. Corona treatment methods and conditions are not limited.

The present invention will be described in more detail below based on examples and comparative examples. However, the following Examples and Comparative Examples are only one example to explain 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 Mitsubishi Chemical Corp. Surface resistance was measured using Hiresta-Up MCP-HP450 equipment under the conditions of 25℃, 50%RH, 500V, and 10 seconds.

2) Coating thickness measurement

The coating thickness was measured using TEM equipment.

3) Tribostatic electricity (frictional voltage)

The measurement method is using DAIEI KAGAKU SEIKI MFG Co.,LTD and Rotary Static Tester (RST-300A) equipment, at 25℃, 50%Rh, pressing the laminated film and cotton cloth with a force of 4.9N and rotating at 400rpm for 1 minute. After doing so, the static electricity generated at that time was recorded.

The tribostatics of the antistatic film and the laminated film were measured, respectively. The antistatic film measured the tribostatic of the antistatic layer, and the laminated film measured the tribostatic of the functional layer laminated on the antistatic layer.

① After cutting the film into a size of 50 × 80 mm, the initial static electricity on the surface was measured. It was confirmed that the initial static electricity was 0 volt.

② Rub the surface of the film with a cotton cloth for 1 minute. Friction was performed at 4.9N pressure and 400rpm for 1 min.

③ Tribostatics were measured.

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

As a dispersion of an acrylic copolymer containing an ammonium carboxylic acid base, 15 wt% of Bondeip PA100 (solid content 30 wt%) from Konishi Co., Ltd. and 75 wt% of water were placed in a mixing vessel and stirred for 1 hour. Here, 5 wt% of UNISTAT 3PN from Sychem, an amphoteric surfactant, was added to the mixing vessel and stirred for another hour. Add 4wt% of DIC's BECKAMINE-J101 as a melamine-based hardener and stir again for 30 minutes, then add 1wt% of BYK's BYK 348 as a silicone-based wetting agent to the mixing container and stir for an additional hour to prepare a water-dispersible antistatic composition (1 ) was prepared.

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

As a dispersion of an acrylic copolymer containing an ammonium carboxylic acid base, 30 wt% of Bondeip PA100 (solid content 30 wt%) manufactured by Konishi Co., Ltd. and 50 wt% of water were placed in a mixing vessel and stirred for 1 hour. Here, 10 wt% of UNISTAT 3PN from SY Chem as an amphoteric surfactant was added to the mixing vessel and stirred for another hour. Add 8wt% of DIC's BECKAMINE-J101 as a melamine-based hardener and stir again for 30 minutes, then add 2wt% of BYK's BYK 348 as a silicone-based wetting agent to the mixing container and stir for an additional hour to prepare a water-dispersible antistatic composition (2). ) was prepared.

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

12 wt% of Primal-3208 (solid content 44 wt%) from Rohm & Haas as an acrylic water dispersion, 8 wt% of SY Chem, UNISTA 3PN as an amphoteric antistatic agent, and 79 wt% of water were placed in a mixing vessel and stirred for 30 minutes. Here, 1 wt% of BYK 348 from BYK as a silicone-based wetting agent was added and stirred for an additional hour to prepare a water-dispersible antistatic composition (3).

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

10.9 wt% of acrylic water dispersion (ATX-014 from Takamatsu, Japan, solid content 40 wt%), and an anionic polymer antistatic agent from Jinbo Co., Ltd., ICP-323 (molecular weight 100,000 g/mol or more, solid content 25.5 wt%) 17.45 wt% and 70.65 wt% water were added to a mixing vessel and stirred for 30 minutes. Here, 1 wt% of BYK 348 from BYK as a silicone-based wetting agent was added and stirred for an additional hour to prepare a water-dispersible antistatic composition (4).

[Example 1]

1) Manufacturing of antistatic film

An unstretched sheet was manufactured by melt-extruding polyethylene terephthalate chips and 50ppm of silica particles with an average particle diameter of 0.7㎛. The unstretched sheet was stretched three times in the machine direction (MD) at 120°C. Thereafter, the water-dispersible antistatic composition (1) prepared in Preparation Example 1 was coated on one side using a bar coating method, preheated to 150°C, dried, and stretched 4.1 times in the transverse direction (TD). Afterwards, heat treatment was performed at 230°C in a 5-stage tenter, and the film was relaxed by 10% in the longitudinal and transverse directions at 200°C and heat set to produce a 25㎛ biaxially stretched film coated on one side.

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

2) Manufacturing of laminated film

An acrylic adhesive (Gangnam Hwaseong, KUB-338S, adhesive solid content 25% by weight) was applied to the surface of the antistatic layer of the prepared antistatic film to a thickness of 3 ㎛ using a #4 bar coater, dried at 140°C for 30 seconds, A polyethylene terephthalate film with a thickness of 25㎛ was laminated on the adhesive layer and then laminated by applying a pressure of 0.4 MPa at 120°C using a laminating equipment (laminator, Model Digital 360).

[Example 2]

An antistatic film was manufactured in the same manner as in Example 1, except that the water-dispersible antistatic composition (2) prepared in Preparation Example 2 was used to prepare the antistatic layer so that the dry application thickness was 250 nm. When manufacturing the laminated film, , a lamination film was prepared in the same manner as in Example 1.

[Example 3]

The same antistatic film as in Example 1 was used, and a lamination film was manufactured in the same manner as in Example 1, except that a polyethylene terephthalate film with a thickness of 15 μm was used.

[Example 4]

The same antistatic film as in Example 1 was used, and a lamination film was manufactured in the same manner as in Example 1, except that a polyethylene terephthalate film with a thickness of 50 μm was used.

[Example 5]

An antistatic film was manufactured in the same manner as in Example 1, except that the water-dispersible antistatic composition (2) prepared in Preparation Example 2 was used to prepare the antistatic layer so that the dry application thickness was 250 nm. When manufacturing the laminated film, A laminated film was prepared in the same manner as in Example 1, except that a polyethylene terephthalate film with a thickness of 15 μm was used.

[Example 6]

An antistatic film was manufactured in the same manner as in Example 1, except that the water-dispersible antistatic composition (2) prepared in Preparation Example 2 was used to prepare the antistatic layer so that the dry application thickness was 250 nm. When manufacturing the laminated film, A laminated film was prepared in the same manner as in Example 1, except that a polyethylene terephthalate film with a thickness of 50 μm was used.

[Comparative Example 1]

A polyester film was manufactured in the same manner as Example 1, except that an antistatic layer was not formed.

Thereafter, the laminated film was manufactured in the same manner as Example 1.

[Comparative Example 2]

The polyester film of Comparative Example 1 without forming an antistatic layer was used, and a lamination film was prepared in the same manner as in Example 1, except that a polyethylene terephthalate film with a thickness of 15 μm was used when manufacturing the lamination film.

[Comparative Example 3]

The polyester film of Comparative Example 1 without forming an antistatic layer was used, and a lamination film was manufactured in the same manner as in Example 1, except that a polyethylene terephthalate film with a thickness of 50 μm was used when manufacturing the lamination film.

[Comparative Example 4]

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

Thereafter, the laminated film was manufactured in the same manner as Example 1.

[Comparative Example 5]

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

Thereafter, the laminated film was manufactured in the same manner as Example 1.

Anti-static film Laminated film Anti-static layer Antistatic layer thickness (㎚) Functional layer type Functional layer thickness (㎛) Example 1 Manufacturing example 1 100 PET film 25 Example 2 Manufacturing example 2 250 PET film 25 Example 3 Manufacturing example 1 100 PET film 15 Example 4 Manufacturing example 1 100 PET film 50 Example 5 Manufacturing example 2 250 PET film 15 Example 6 Manufacturing 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 Manufacturing Example 1 100 PET film 25 Comparative Example 5 Comparative Manufacturing Example 2 100 PET film 25

surface resistance
(Ω/□) Tribostatic (kV) Anti-static film Laminated film Tribostatic reduction rate of laminated 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 comparing Comparative Example 1 with Examples 1 and 2, when the antistatic film of the present invention was used, the tribostatic reduction rate of the laminated film was 87.56 compared to Comparative Example 1 without forming an antistatic layer. It showed physical properties greater than %. From these results, it was found that the antistatic layer exhibited excellent antistatic properties even without being exposed to the surface. As shown in Examples 1 and 2, it was found that the thicker the antistatic layer was, the greater the tribostatic reduction rate.

[Example 7]

The same antistatic film as Example 1 was used, and when manufacturing the laminated film, a 19㎛ thick nylon film (Kolon Industries, CNR01) was used instead of a 25㎛ thick polyethylene terephthalate film. Same as Example 1. A laminated film was manufactured.

[Example 8]

An antistatic film was manufactured in the same manner as in Example 1, except that the water-dispersible antistatic composition (2) prepared in Preparation Example 2 was used to prepare the antistatic layer so that the dry application thickness was 250 nm. When manufacturing the laminated film, A laminated film was prepared in the same manner as in Example 1, except that a nylon film (Kolon Industries, CNR01) with a thickness of 19 μm was used instead of a polyethylene terephthalate film with a thickness of 25 μm.

[Comparative Example 6]

The polyester film of Comparative Example 1 without forming an antistatic layer was used, and a lamination film was prepared in the same manner as in Example 1, except that a 19㎛ thick nylon film (Kolon Industries, CNR01) was used when manufacturing the lamination film. did.

[Comparative Example 7]

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

A laminated film was manufactured in the same manner as in Example 1, except that a 19㎛ thick nylon film (Kolon Industries, CNR01) was used.

[Comparative Example 8]

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

A laminated film was manufactured in the same manner as in Example 1, except that a 19㎛ thick nylon film (Kolon Industries, CNR01) was used.

Anti-static film Laminated film Anti-static layer Antistatic layer thickness (㎚) Functional layer type Functional layer thickness (㎛) Example 7 Manufacturing Example 1 100 Nylon film 19 Example 8 Manufacturing example 2 250 Nylon film 19 Comparative Example 6 - - Nylon film 19 Comparative example 7 Comparative Manufacturing Example 1 100 Nylon film 19 Comparative example 8 Comparative Manufacturing Example 2 100 Nylon film 19

Surface resistance (Ω/□) Tribostatic (kV) Anti-static film Laminated film Tribostatic reduction rate of laminated 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 using the antistatic film of the present invention, it was confirmed that tribostatic electricity was significantly reduced compared to Comparative Example 6 without forming an antistatic layer.

[Example 9]

The same antistatic film as Example 1 was used, and when manufacturing the laminated film, an ionomer film (Dupont, PV5400) with a thickness of 50 μm was used instead of a polyethylene terephthalate film with a thickness of 25 μm. A laminated film was manufactured.

[Example 10]

An antistatic film was manufactured in the same manner as in Example 1, except that the water-dispersible antistatic composition (2) prepared in Preparation Example 2 was used to prepare the antistatic layer so that the dry application thickness was 250 nm. When manufacturing the laminated film, A laminated film was prepared in the same manner as in Example 1, except that an ionomer film (Dupont, PV5400) with a thickness of 50 μm was used instead of a polyethylene terephthalate film with a thickness of 25 μm.

[Comparative Example 9]

The polyester film of Comparative Example 1 without forming an antistatic layer was used, and a lamination film was prepared in the same manner as in Example 1, except that an ionomer film (Dupont, PV5400) with a thickness of 50 μm was used when manufacturing the lamination film. .

[Comparative Example 10]

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

A laminated film was manufactured in the same manner as in Example 1, except that an ionomer film (Dupont, PV5400) with a thickness of 50 μm was used.

[Comparative Example 11]

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

A laminated film was manufactured in the same manner as in Example 1, except that an ionomer film (Dupont, PV5400) with a thickness of 50 μm was used.

Anti-static film Laminated film Anti-static layer Antistatic layer thickness (㎚) Functional layer type Functional layer thickness (㎛) Example 9 Manufacturing Example 1 100 Ionomer film 50 Example 10 Manufacturing example 2 250 Ionomer film 50 Comparative Example 9 - - Ionomer film 50 Comparative Example 10 Comparative Manufacturing Example 1 100 Ionomer film 50 Comparative Example 11 Comparative Manufacturing Example 2 100 Ionomer film 50

Surface resistance (Ω/□) Tribostatic (kV) Anti-static film Laminated film Tribostatic reduction rate of laminated 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)

It 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 containing a dispersion of an acrylic copolymer containing an ammonium carboxylate base, an amphoteric surfactant, a curing agent, and water,
When a laminated film is manufactured by laminating at least one functional layer having a thickness of 15 to 50 ㎛ on the antistatic layer, an antistatic film having a tribostatic reduction rate of 60% or more according to Equation 1 below.
[Equation 1]
Tribostatic reduction rate = (tribostatic value of the laminated film excluding the antistatic layer - tribostatic value of the laminated film including the antistatic layer)/tribostatic value of the laminated film excluding the antistatic layer × 100 According to clause 1,
The functional layer is an antistatic film in which any one or two or more selected from the group consisting of an inorganic deposition layer, a resin film layer, a metal film layer, a hard coating layer, an adhesive layer, a light diffusion layer, and a printing layer are laminated. According to clause 1,
The polyester base film is biaxially stretched and has an antistatic film with a thickness of 12 to 250 ㎛. According to clause 1,
The polyester base film is an antistatic film that is a single-layer film or a film in which two or more layers are co-extruded and laminated. According to clause 1,
The water-dispersible antistatic composition includes 10 to 30% by weight of an acrylic copolymer dispersion containing an ammonium carboxylate base, 1 to 10% by weight of an amphoteric surfactant, 1 to 10% by weight of a curing agent, and a remaining amount of water. An antistatic film having a solid content of 10 to 40% by weight. According to clause 1,
The antistatic layer is an antistatic film having a dry application thickness of 10 to 500 nm. According to clause 1,
An antistatic film wherein the antistatic layer has a surface resistance of 10 ⁸ to 10 ¹² Ω/sq.