Antistatic sheet and manufacturing method thereof

Abstract

To provide an antistatic sheet and a manufacturing method thereof.SOLUTION: An antistatic sheet according to an embodiment of the technical idea of the present invention includes: a conductive color pattern layer 300; a transparent protective layer 400 positioned on the conductive color pattern layer 300 to protect a surface of the conductive color pattern layer 300; a body layer 200 positioned under the conductive color pattern layer 300; and a lower layer 100 positioned under the body layer 200. According to the configuration, a manufacturing method of an antistatic sheet according to various embodiments of the technical idea of the present invention may include an antistatic agent to form the antistatic sheet, so that it is possible to stably prevent static electricity that may occur on the floor of industrial sites such as semiconductor manufacturing plants or various offices, thereby manufacturing the antistatic sheet capable of preventing harmful effects such as damage to devices or parts caused by static electricity.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an antistatic sheet and a method for manufacturing the same, and more particularly to an antistatic sheet containing an antistatic agent, which can stably prevent static electricity that may be generated on the floors of industrial sites such as semiconductor manufacturing plants and various offices, thereby preventing adverse effects such as damage to devices and parts caused by static electricity, and a method for manufacturing the same. [Background technology]

[0002] Generally, in semiconductor assembly lines, antistatic sheets are used to prevent damage to products caused by static electricity. For example, when a worker works at a workbench, the worker places an antistatic sheet on top of the workbench, places the semiconductor components that are the work targets on the sheet, and then performs tasks such as assembly.

[0003] Among conventional antistatic sheets, those widely used in semiconductor product assembly lines and the like include a method in which a fiber fabric made by weaving and arranging carbon threads is applied to the top plate of the antistatic sheet, or a method in which nanometal powder is dissolved and electrochemically coated onto the surface of the fiber fabric for the top plate, or the method in which it is immersed in a tissue.

[0004] However, the conventional methods have some limitations.

[0005] For example, in the case of a fiber fabric in which carbon threads are woven and arranged, the woven and arranged carbon threads are distinguished from the original color of the fiber fabric, resulting in a striped surface pattern. When used on a workbench, there is a problem that the optical illusion caused by the surface pattern of the carbon threads can cause eye fatigue for the worker.

[0006] Furthermore, in the case of fiber fabrics in which carbon threads are woven and arranged, the surface resistance of the tabletop may vary depending on the direction and spacing in which the carbon threads are woven and arranged, so a stable antistatic effect may not be obtained depending on the size of the semiconductor components and the position and direction in which the worker places the semiconductor components that are the object of their work.

[0007] Furthermore, conventional antistatic sheets must have electrostatic properties, so they use PVC mixed with an antistatic agent or carbon and a conductive metal, but such conventional structures are difficult to manufacture, and when carbon is used, the carbon is black, so it is not possible to form various color patterns, resulting in an undesirable appearance.

[0008] Existing antistatic sheets have a separate conductive sheet layer containing carbon or metal in the middle, and a pattern layer (or color layer) is placed on top of this conductive sheet layer to improve its appearance. However, the pattern layer is not conductive because it uses general pigments, and through holes must be made to allow electricity to pass through it, which causes manufacturing problems and significantly reduces durability. Summary of the Invention [Problem to be solved by the invention]

[0009] An object of the present invention is to provide an antistatic sheet containing an antistatic agent, which can stably prevent static electricity that may be generated on the floors of industrial sites such as semiconductor manufacturing plants and various offices, thereby preventing adverse effects such as damage to devices and parts caused by static electricity, and a method for manufacturing the same.

[0010] Another object of the present invention is to provide an antistatic sheet and a manufacturing method thereof that can achieve excellent antistatic effects without using a carbon or metal layer contained in conventional antistatic sheets, by imparting conductivity to a pattern layer, and without providing a separate conductive sheet layer. [Means for solving the problem]

[0011] In one embodiment of the inventive concept, an antistatic sheet is disclosed.

[0012] The antistatic sheet includes a conductive color pattern layer 300, a transparent protective layer 400 positioned on top of the conductive color pattern layer 300 to protect the surface of the conductive color pattern layer 300, a main layer 200 positioned below the conductive color pattern layer 300, and a lower layer 100 positioned below the main layer 200.

[0013] In another embodiment of the technical concept of the present invention, a method for manufacturing an antistatic sheet is disclosed.

[0014] The method for manufacturing the antistatic sheet includes manufacturing a transparent protective layer 400, a conductive color pattern layer 300, a main layer 200, and a lower layer 100, sequentially stacking the transparent protective layer 400, the conductive color pattern layer 300, the main layer 200, and the lower layer 100, and then thermally laminating the layers to manufacture the antistatic sheet 10. The conductive color pattern layer 300 is manufactured to include a base layer 340 and a conductive pigment layer 320 located on the base layer 340, and the conductive pigment layer 320 is formed by dissolving the conductive pigment layer 320 in an organic solvent 10-3000. 0 parts by weight of the conductive pigment layer, 50 to 70 parts by weight of the binder, and 1 to 10 parts by weight of the pigment are mixed together in a weight ratio to prepare a pigment solution, and then the pigment solution is coated in a predetermined pattern on the underlayer 340 using a gravure printing method to form the underlayer 340 on which the pigment layer is printed. The underlayer 340 on which the pigment layer is printed is primarily dried at a temperature of 50 to 80°C, and then the underlayer 340 on which the primarily dried pigment layer is printed is heat-treated at a temperature of 100 to 150°C to be secondarily dried, thereby forming the conductive pigment layer 320.

[0015] Other specific details of the embodiments are included in the description of the invention. [Effects of the Invention]

[0016] The method for manufacturing an antistatic sheet according to various embodiments of the technical concept of the present invention makes it possible to manufacture an antistatic sheet that contains an antistatic agent, thereby stably preventing static electricity that may occur on the floors of industrial sites such as semiconductor manufacturing factories and various offices, thereby preventing adverse effects such as damage to equipment and parts caused by static electricity.

[0017] In addition, the antistatic sheets according to various embodiments of the technical concept of the present invention can achieve excellent antistatic effects without using a carbon or metal layer contained in conventional antistatic sheets, by imparting conductivity to the pattern layer, without providing a separate conductive sheet layer. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a cross-sectional view schematically illustrating a cross section of an antistatic sheet according to an embodiment of the technical concept of the present invention. [Figure 2] 1 is a photograph showing the resistance of a conductive color pattern layer manufactured according to an example. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An antistatic sheet according to a preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] FIG. 1 is a cross-sectional view schematically showing a cross section of an antistatic sheet according to one embodiment of the technical concept of the present invention.

[0021] Referring to FIG. 1, an antistatic sheet 10 according to one embodiment of the technical concept of the present invention includes a conductive color pattern layer 300, a transparent protective layer 400 positioned on top of the conductive color pattern layer 300 to protect the surface of the conductive color pattern layer 300, a main layer 200 positioned below the conductive color pattern layer 300, and a bottom layer 100 positioned below the main layer 200.

[0022] The conductive color pattern layer 300 may be a layer containing an antistatic agent, which is a conductive material, and may be a patterned layer. The conductive color pattern layer 300 includes an underlayer 340 and a conductive pigment layer 320 located on the underlayer 340.

[0023] The base layer 340 may contain soft PVC and an antistatic agent, and the antistatic agent may be contained in a weight ratio of 0.1 to 5 parts by weight per 100 parts by weight of the total content of the soft PVC, and the base layer 340 may be formed to a thickness in the range of 0.3 to 1.0 mm.

[0024] The soft PVC (Polyvinyl Chloride) has excellent flexibility (softness) and exhibits high tensile strength and elongation, and is therefore useful for protecting the surface of an adherend from damage such as pressing and scratches.

[0025] Unlike hard boards, flexible PVC can be used in a wide range of thicknesses, from low to high. In the case of low thickness, it is widely used for various high-frequency products and as windproof vinyl, while in the case of high thickness, it is used for various pallets, covers, vinyl curtains, etc.

[0026] Furthermore, the flexible PVC is extremely flexible, transparent, chemical-resistant, and durable, and is also suitable as a lining material for plating tanks and the chemical industry. The flexible PVC can be manufactured in a variety of colors, but transparent flexible PVC is generally the most common, and gray flexible PVC is also widely available on the market.

[0027] The antistatic agent is a conductive substance that has excellent conductivity and can discharge an electric charge. As the antistatic agent, at least one selected from the group consisting of electrically conductive metal materials, carbon materials, and conductive polymers may be used.

[0028] For example, the metal material may be at least one selected from silver or copper, which have excellent conductivity; the carbon material may be at least one selected from the group consisting of carbon powder, graphene, and graphite; and the conductive polymer may be at least one selected from the group consisting of polyaniline, polypyrrol, polythiophene, polyethylene dioxythiophene, a quaternary ammonium compound, an epoxidized amine, a fatty acid ester, a sulfated wax, and a lithium amide complex.

[0029] In the present invention, the base layer 340 is made of flexible PVC. However, if rigid PVC is used, there is a risk that an antistatic agent will not be mixed in during the manufacture of the base layer 340. However, if an antistatic agent is mixed into flexible PVC as in the present invention, the antistatic agent is present on the surface of the base layer 340, and current flows along the surface of the flexible PVC, making it conductive.

[0030] Furthermore, the base layer 340 may be formed to a thickness in the range of 0.3 to 1.0 mm. However, if the thickness of the base layer 340 exceeds 1.0 mm, the soft PVC may not soften during the heat treatment process in manufacturing the base layer 340, and the antistatic agent present on the surface of the base layer 340 may be detached and difficult to transfer to the conductive pigment layer 320 described below. If the thickness of the base layer 340 is less than 0.1 mm, the physical properties of the manufactured base layer 340 may be reduced.

[0031] The conductive pigment layer 320 may be a pigment layer containing an antistatic agent to exhibit conductivity, and the conductive pigment layer 320 may be formed to a thickness in the range of 0.005 to 0.015 mm.

[0032] The conductive pigment layer 320 may be formed in a predetermined pattern by mixing an organic solvent, a binder, and a pigment to prepare a pigment solution, and then coating the pigment solution on the underlayer 340 using a gravure printing method.

[0033] That is, the conductive pigment layer 320 may be formed by preparing a pigment solution by mixing 10 to 30 parts by weight of an organic solvent, 50 to 70 parts by weight of a binder, and 1 to 10 parts by weight of a pigment, and then coating the pigment solution in a predetermined pattern on the underlayer 340 using a gravure printing method to form the underlayer 340 on which the pigment layer is printed. The underlayer 340 on which the pigment layer is printed may then be primarily dried at a temperature of 50 to 80°C, and then the underlayer 340 on which the primarily dried pigment layer is printed may be heat-treated at a temperature of 100 to 150°C to be secondarily dried, thereby forming the conductive pigment layer 320.

[0034] At this time, during the primary drying process of the base layer 340 on which the pigment layer is printed at a temperature of 50 to 80°C, a portion of the antistatic agent remaining on the surface of the base layer 340 may transfer (or migrate) to the pigment layer, thereby forming the conductive pigment layer 320.

[0035] The organic solvent may be ethanol, methanol, toluene, benzene, ethylene glycol, thinner, or a mixture thereof.

[0036] The pigment is used to impart a color, and an organic pigment may be used. For example, the organic pigment may be Carmine Pigment Red 57:1 Soluble Azo(Ba) for red, Pigment Yellow 13 Insoluble Azo for yellow, Pigment Blue (PB) (Cu-Phthalocyanine(β)) for blue, or Carbon Black (CAS.NO) for black. 1333-86-4) and the like may be used in combination, and various types of organic solvents known in the technical field may be used, such as red pigments such as anthraquinone pigments, azo pigments, and perylene pigments; blue pigments such as metal phthalocyanine pigments, indanthrone pigments, and indophenol pigments; green pigments such as chromium oxide, zinc phthalocyanine, and halogenated phthalocyanine pigments; violet pigments such as dioxazine violet and methyl violet; yellow pigments such as tetrachloroisoindolidene pigments and benzidine yellow pigments; black pigments such as titanium black, aniline black, and carbon black; as well as cyanine, magenta, and white pigments.

[0037] The binder may be used to provide adhesion to the underlayer 340, and an acrylic resin may be used as the binder.

[0038] For example, the acrylic resin may be produced by maintaining a polymerization temperature of 90 to 95°C in a polymerization reactor equipped with a stirrer, heater, cooler, and condenser required for progressing the polymerization reaction, and equipped with a nitrogen purging means for changing the oxygen atmosphere in the polymerization reactor to an inert nitrogen atmosphere and maintaining that atmosphere, by adding an acrylic monomer, a functional monomer, a phosphorus-based monomer, methacrylic acid, and a catalyst in the presence of alcohol and water, and then reacting them for 3 to 5 hours to obtain a reaction product, and then adding water and a neutralizing agent to the reaction product and dispersing it in water.

[0039] As the acrylic monomer, at least one selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl acrylate styrene, and acrylonitrile monomer may be used.

[0040] The functional monomer may be used to improve the water resistance and adhesion to a substrate of the acrylic resin, but the functional monomer may also improve the adhesion of the acrylic resin by improving the reactivity with methacrylic acid contained in the acrylic resin and forming a network bond.

[0041] For example, the functional monomer may be at least one selected from the group consisting of 2-hydroxymethyl acrylate, 2-hydroxyethyl (meth)acrylate, glycidyl (meth)acrylate, aryl (meth)acrylate, hydroxypropyl acrylate, aryl (meth)acrylate, and hydroxypropyl acrylate, and the functional monomer may be contained in an amount of 20 to 40 parts by weight per 100 parts by weight of the acrylic monomer.

[0042] The phosphorus-based monomer may be used to improve adhesion and rust prevention, and the phosphorus-based monomer may be at least one selected from monoalkyl phosphates and dialkyl phosphates, and the phosphorus-based monomer may be included in an amount of 2 to 10 parts by weight based on 100 parts by weight of the acrylic monomer.

[0043] The methacrylic acid may be used to improve adhesiveness by polymerizing with the acrylic monomer or to induce water dispersibility by saponifying a carboxyl group, and the methacrylic acid may be included in an amount of 5 to 15 parts by weight based on 100 parts by weight of the acrylic monomer.

[0044] The catalyst may be used to open the double bond of the monomer to promote the polymerization reaction, and the catalyst may be at least one selected from the group consisting of BPO (Benzoyl Peroxide), AIBN (2,2'-Azobisisobutyronitrile), and DTBPO (Di-Tert-Butyl Peroxide). The catalyst may be included in an amount of 1 to 5 parts by weight based on 100 parts by weight of the acrylic monomer.

[0045] The neutralizing agent may be used to adjust the pH of the acrylic resin formed by polymerizing the monomer within a certain range. For example, the known neutralizing agent AMP (2-AMINO-2-METHYL-1-PROPANOL)-95 may be used as the neutralizing agent. The neutralizing agent may be contained in an amount of 5 to 10 parts by weight based on 100 parts by weight of the acrylic monomer.

[0046] In the present invention, an acrylic monomer, a functional monomer, and a phosphorus-based monomer may be used as monomers for producing the acrylic resin as described above, and the weight average molecular weight (Mw) of the acrylic resin formed by polymerizing the monomers may be 5,000 to 10,000, and the pH may be 8 to 8.5.

[0047] The Tg of the acrylic resin formed by polymerizing the monomers may be in the range of -5 to 20°C. However, if the Tg of the acrylic resin is too high, the coating film may become too strong and cracks may occur, whereas if the Tg is too low, problems may arise with drying properties. Therefore, the Tg of the acrylic resin is preferably in the range of -5 to 20°C.

[0048] The pattern formed on the base layer 340 using the gliding printing method may be manufactured in various forms known in the art, and preferably, the pattern is connected without any breaks. When the pattern is connected, the overall conductivity is improved and the surface resistance of the conductive color pattern layer 300 is reduced.

[0049] The formation of a pattern using the gravure printing method or the like in the present invention is a known technique, and for the sake of convenience and clarity of the technical idea of ​​the present invention, a detailed description thereof will be omitted.

[0050] The transparent protective layer 400 may be positioned on the conductive color pattern layer 300 to protect the surface of the conductive color pattern layer 300, and the transparent protective layer 400 may be formed to a thickness in the range of 0.1 to 0.5 mm.

[0051] In addition, the transparent protective layer 400 may be manufactured by including a transparent flexible PVC and an antistatic agent, so that the conductive color pattern layer 300 can be visualized by a user with its external color, thereby improving the aesthetics. The antistatic agent may be included in a weight ratio of 0.1 to 3 parts by weight based on 100 parts by weight of the total content of the flexible PVC.

[0052] The main body layer 200 may be located under the conductive color pattern layer 300 to attenuate external impacts applied to the antistatic sheet 10 and also attenuate static electricity generated on the antistatic sheet 10 .

[0053] The main layer 200 may contain a flexible PVC, an antistatic agent, and a plasticizer, with the weight ratio of the antistatic agent being 1 to 3 parts by weight and the plasticizer being 0.5 to 1.5 parts by weight per 100 parts by weight of the total content of the flexible PVC, and the main layer 200 may be formed to a thickness in the range of 1 to 5 mm.

[0054] The plasticizer is mixed with flexible PVC to impart elastic modulus and flexibility, while also lowering the melt viscosity to improve the processability of the flexible PVC. It may also lower the melt viscosity and glass transition temperature (Tg) to improve processability and impart various physical properties and functions such as flexibility and cold resistance to the final product. For example, the plasticizer may be at least one selected from phthalate-based plasticizers, terephthalate-based plasticizers, benzoate-based plasticizers, citric acid-based plasticizers, phosphate-based plasticizers, and adipate-based plasticizers. Preferably, an epoxy-based plasticizer, which is a stabilizer with excellent heat resistance and cold resistance, may be provided.

[0055] The epoxy-based plasticizer may include, but is not limited to, epoxidized octyl stearate, epoxidized fatty acid ester, and the like.

[0056] The benzoate-based plasticizer may be, but is not limited to, 2-(2-(2-phenylcarbonyloxyethoxy)ethoxy)ethyl benzoate, glyceryl tribenzoate, trimethylolpropane tribenzoate, isononyl benzoate, 1-methyl-2-(2-phenylcarbonyloxypropoxy)ethyl benzoate, 2,2,4-trimethyl-1,3-pentanediol dibenzoate, n-hexyl benzoate, or trimethylolpropane tribenzoate. The citrate-based plasticizer may be, but is not limited to, acetyl tributyl citrate or tributyl citrate.

[0057] The phosphate-based plasticizer may be, but is not limited to, tricresyl phosphate or tributyl phosphate.

[0058] The adipate-based plasticizer may be, but is not limited to, bis(2-ethylhexyl) adipate, dimethyl adipate, monomethyl adipate, or dioctyl adipate or diisononyl adipate.

[0059] The lower layer 100 may be located below the main layer 200 and contact the floor surface to fix the antistatic sheet 10 and attenuate static electricity generated below the antistatic sheet 10 .

[0060] The lower layer 100 may include a flexible PVC and a carbon material, and the carbon material may be included in a weight ratio of 1 to 5 parts by weight based on 100 parts by weight of the total content of the flexible PVC. The lower layer 100 may be formed to a thickness in the range of 0.1 to 1 mm.

[0061] Furthermore, the carbon material may be mixed with the flexible PVC to provide an antistatic effect, and for example, the carbon material may be at least one selected from the group consisting of carbon powder, graphene, and graphite.

[0062] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing an antistatic sheet according to an embodiment of the present invention will now be described in more detail with reference to the accompanying drawings.

[0063] First, to manufacture the antistatic sheet 10 according to one embodiment of the technical concept of the present invention, the transparent protective layer 400, the conductive color pattern layer 300, the main layer 200, and the lower layer 100 may be manufactured.

[0064] The transparent protective layer 400 may be manufactured by including a transparent flexible PVC and an antistatic agent, thereby allowing the user to visualize the conductive color pattern layer 300 with its appearance color, thereby improving the aesthetics. The antistatic agent may be included in a weight ratio of 0.1 to 3 parts by weight with respect to 100 parts by weight of the total content of the flexible PVC, and the transparent protective layer 400 may be formed to a thickness in the range of 0.1 to 0.5 mm.

[0065] The conductive color pattern layer 300 may be manufactured to include an underlayer 340 and a conductive pigment layer 320 located on the underlayer 340 .

[0066] The base layer 340 may contain soft PVC and an antistatic agent, and the antistatic agent may be contained in a weight ratio of 0.1 to 5 parts by weight per 100 parts by weight of the total content of the soft PVC, and the base layer 340 may be formed to a thickness in the range of 0.3 to 1.0 mm.

[0067] In the present invention, the base layer 340 is made of flexible PVC. However, if rigid PVC is used, there is a risk that an antistatic agent will not be mixed in during the manufacture of the base layer 340. However, if an antistatic agent is mixed into flexible PVC as in the present invention, the antistatic agent is present on the surface of the base layer 340, and current flows along the surface of the flexible PVC, making it conductive.

[0068] Furthermore, the base layer 340 may be formed to a thickness in the range of 0.3 to 1.0 mm. However, if the thickness of the base layer 340 exceeds 1.0 mm, the soft PVC may not soften during the heat treatment process in manufacturing the base layer 340, and the antistatic agent present on the surface of the base layer 340 may be detached and difficult to transfer to the conductive pigment layer 320 described below. If the thickness of the base layer 340 is less than 0.1 mm, the physical properties of the manufactured base layer 340 may be reduced.

[0069] The conductive pigment layer 320 may be a pigment layer containing an antistatic agent to exhibit conductivity, and the conductive pigment layer 320 may be formed to a thickness in the range of 0.005 to 0.015 mm.

[0070] The conductive pigment layer 320 may be formed in a predetermined pattern by mixing an organic solvent, a binder, and a pigment to prepare a pigment solution, and then coating the pigment solution on the underlayer 340 using a gravure printing method.

[0071] That is, the conductive pigment layer 320 may be formed by preparing a pigment solution by mixing 10 to 30 parts by weight of an organic solvent, 50 to 70 parts by weight of a binder, and 1 to 10 parts by weight of a pigment, and then coating the pigment solution in a predetermined pattern on the underlayer 340 using a gravure printing method to form the underlayer 340 on which the pigment layer is printed. The underlayer 340 on which the pigment layer is printed may then be primarily dried at a temperature of 50 to 80°C, and then the underlayer 340 on which the primarily dried pigment layer is printed may be heat-treated at a temperature of 100 to 150°C to be secondarily dried, thereby forming the conductive pigment layer 320.

[0072] At this time, during the primary drying process of the base layer 340 on which the pigment layer is printed at a temperature of 50 to 80°C, a portion of the antistatic agent remaining on the surface of the base layer 340 may transfer (or migrate) to the pigment layer, thereby forming the conductive pigment layer 320.

[0073] The main layer 200 may contain a flexible PVC, an antistatic agent, and a plasticizer, with the weight ratio of the antistatic agent being 1 to 3 parts by weight and the plasticizer being 0.5 to 1.5 parts by weight per 100 parts by weight of the total content of the flexible PVC, and the main layer 200 may be formed to a thickness in the range of 1 to 5 mm.

[0074] The lower layer 100 may include a flexible PVC and a carbon material, and the carbon material may be included in a weight ratio of 1 to 5 parts by weight based on 100 parts by weight of the total content of the flexible PVC. The lower layer 100 may be formed to a thickness in the range of 0.1 to 1 mm.

[0075] Next, the transparent protective layer 400, the conductive color pattern layer 300, the main body layer 200, and the lower layer 100 are sequentially laminated, and then the antistatic sheet 10 may be manufactured by thermal lamination.

[0076] For example, the transparent protective layer 400, the conductive color pattern layer 300, the main body layer 200, and the lower layer 100 are thermally laminated at a temperature of 120 to 150°C and a pressure of 40 to 60 kg / cm. 2 Alternatively, the lamination may be performed by a flat pressing process under the conditions of

[0077] Hereinafter, an antistatic sheet according to an embodiment of the technical concept of the present invention will be described in detail with reference to the accompanying drawings. The following examples are for illustrative purposes only, and the present invention is not limited to the following examples, and may be modified and changed in various ways.

[0078] <Example> A conductive color pattern layer was produced, which consisted of an underlayer and a conductive pigment layer located on top of the underlayer.

[0079] The underlayer was prepared by mixing 100 parts by weight of the total content of soft PVC with 3 parts by weight of the antistatic agent, and the underlayer was formed to a thickness of 0.7 mm.

[0080] At this time, polypyrrole was used as the antistatic agent.

[0081] The conductive pigment layer was formed to a thickness of 0.01 mm. The conductive pigment layer was prepared by mixing 20 parts by weight of an organic solvent, 60 parts by weight of a binder, and 5 parts by weight of a pigment to prepare a pigment solution, and then coating the pigment solution on the base layer in a predetermined pattern using a gravure printing method to form a base layer on which a pigment layer was printed. The base layer on which the pigment layer was printed was primarily dried at a temperature of 65°C, and then the base layer on which the primarily dried pigment layer was printed was heat-treated at a temperature of 130°C to perform secondary drying, thereby forming the conductive pigment layer.

[0082] Resistance measurement of conductive color pattern layer The resistance of the conductive color pattern layer manufactured according to the above example was measured.

[0083] FIG. 2 is a photograph showing the resistance of the conductive color pattern layer produced according to the example.

[0084] Referring to FIG. 2, the resistance of the conductive color pattern layer manufactured according to the embodiment is 10 3 OHMS(Ω), which confirmed that the conductive color pattern layer manufactured according to the examples can stably prevent static electricity and prevent adverse effects such as damage to devices or parts caused by static electricity.

Claims

1. a conductive color pattern layer 300; a transparent protective layer 400 positioned on the conductive color pattern layer 300 to protect the surface of the conductive color pattern layer 300; a main body layer 200 located under the conductive color pattern layer 300; and a lower layer (100) located below the main layer (200).

2. 2. The antistatic sheet according to claim 1, wherein the conductive color pattern layer (300) comprises a base layer (340) and a conductive pigment layer (320) located on the base layer (340).

3. 3. The antistatic sheet according to claim 2, wherein the base layer (340) comprises flexible PVC and an antistatic agent, the antistatic agent being contained in a weight ratio of 0.1 to 5 parts by weight per 100 parts by weight of the total content of the flexible PVC, and the base layer (340) is formed to a thickness in the range of 0.3 to 1.0 mm.

4. 4. The antistatic sheet according to claim 3, wherein the antistatic agent is at least one selected from the group consisting of a metal material, a carbon material, and a conductive polymer, the metal material being at least one selected from silver or copper, the carbon material being at least one selected from the group consisting of carbon powder, graphene, and graphite, and the conductive polymer being at least one selected from the group consisting of polyaniline, polypyrrol, polythiophene, polyethylene dioxythiophene, a quaternary ammonium compound, an epoxidized amine, a fatty acid ester, a sulfated wax, and a lithium amide complex.

5. 2. The antistatic sheet according to claim 1, wherein the main layer (200) comprises flexible PVC, an antistatic agent, and a plasticizer, the weight ratio of the antistatic agent being 1 to 3 parts by weight and the plasticizer being 0.5 to 1.5 parts by weight per 100 parts by weight of the total content of the flexible PVC, and the main layer (200) is formed to a thickness in the range of 1 to 5 mm.

6. Manufacture a transparent protective layer 400, a conductive color pattern layer 300, a main body layer 200, and a lower layer 100; The transparent protective layer 400, the conductive color pattern layer 300, the main body layer 200, and the lower layer 100 are sequentially laminated, and then thermally laminated to produce the antistatic sheet 10. The conductive color pattern layer 300 is manufactured to include an underlayer 340 and a conductive pigment layer 320 located on the underlayer 340, a pigment solution prepared by mixing 10 to 30 parts by weight of an organic solvent, 50 to 70 parts by weight of a binder, and 1 to 10 parts by weight of a pigment; a gravure printing method to coat the pigment solution on the underlayer in a predetermined pattern to form the underlayer printed with the pigment; a primary drying of the underlayer printed with the pigment layer at a temperature of 50 to 80°C; and a secondary drying of the primary dried underlayer printed with the pigment layer at a temperature of 100 to 150°C to form the conductive pigment layer.

7. 7. The method for manufacturing an antistatic sheet according to claim 6, wherein the conductive pigment layer 320 is formed by transferring a portion of the antistatic agent remaining on the surface of the base layer 340 to the pigment layer during primary drying of the base layer 340 on which the pigment layer is printed at a temperature of 50 to 80°C.

8. The transparent protective layer 400, the conductive color pattern layer 300, the main body layer 200, and the lower layer 100 are thermally laminated at a temperature of 120 to 150° C. and a pressure of 40 to 60 kg / cm ２ 7. The method for producing an antistatic sheet according to claim 6, wherein the method is carried out by laminating the antistatic sheet under the following conditions:

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