JP2008208241A - Antistatic coating agent and laminated body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antistatic coating agent excellent in an adhesion property and a coating property even if a resin component is not substantially used. <P>SOLUTION: The antistatic coating agent contains a tin oxide-based super-fine particle, a hydrophilic organic solvent, and water, and in the coating agent, a concentration of the tin oxide-based super-fine particle is 1 to 8 mass%, a content of the hydrophilic organic solvent is 50 mass% or higher, and a content of the resin component is 1 pt.mass or less based on 100 pts.mass of the tin oxide-based super-fine particle. Further, in the laminate, a coating film obtained by coating/drying the antistatic coating agent is laminated on a substrate. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an antistatic coating agent that is substantially free of resin components and excellent in antistatic properties, adhesion, and coating properties.

  Conventionally, thermoplastic resin films used as general industrial materials and magnetic recording materials have a large surface resistivity, so that they are easily charged by friction or the like, and there is a problem that dust, dirt, etc. adhere to the film surface. appear.

  As a method for solving such a problem, there is a method of applying an antistatic coating agent containing tin oxide ultrafine particles. There have been many studies on sols in which tin oxide-based ultrafine particles are dispersed in an aqueous medium, but these are used as raw materials for antistatic coating agents and are generally charged with tin oxide-based fine particles. Resin particles are added as a binder component to the prevention coating agent (see Patent Documents 1 and 2). Adding resin particles has the advantage of improving wettability and lowering the solvent, but when preparing an antistatic coating agent, work with care to maintain mixing stability and dispersion stability. Depending on the type of resin, the resin may be decomposed due to hydrolysis, etc., causing the antistatic coating agent to become unstable, or the dried resin component may adhere to the coating film or machine. There are problems such as causing defects.

JP 2005-290287 A JP 2006-124439 A

  An object of the present invention is to provide an antistatic coating agent which has appropriate physical properties such as adhesion and coating property and exhibits excellent antistatic properties despite being substantially free of a resin component. And

  As a result of intensive studies to solve the above problems, the present inventor has a tin oxide ultrafine particle concentration of 1% by mass to 8% by mass and contains 50% by mass or more of a hydrophilic organic solvent. Thus, even if it contains almost no resin component, it is possible to impart sufficient coating properties, and the obtained coating film has appropriate adhesion and is excellent in antistatic properties. It has been found that the characteristics are exhibited even on a base material not subjected to a physical surface treatment such as a corona discharge treatment, and the present invention has been achieved based on this finding.

That is, the gist of the present invention is as follows. (1) Contains tin oxide ultrafine particles, a hydrophilic organic solvent and water, has a tin oxide ultrafine particle concentration of 1% by mass to 8% by mass, and the content of the hydrophilic organic solvent is 50% by mass. The antistatic coating agent as described above, wherein the content of the resin component is 1 part by mass or less with respect to 100 parts by mass of the tin oxide ultrafine particles.
(2) The antistatic coating agent according to (1), which is substantially free of a resin component.
(3) The antistatic coating agent according to (1) or (2), wherein the viscosity at 20 ° C. and a shear rate of 20.40 s ⁻¹ is 50 to 500 mPa · s.
(4) The viscosity at 20 ° C. and a shear rate of 20.40 s ⁻¹ is 50 to 500 mPa · s, and the viscosity at 20 ° C. and a shear rate of 1.02 s ⁻¹ is 100 to 10,000 mPa · s. The antistatic coating agent according to any one of (1) to (3), which is characterized in that
(5) A laminated film obtained by laminating a coating film formed by applying and drying the antistatic coating agent according to any one of (1) to (4) on a substrate.

  The antistatic coating agent of the present invention has good coating properties, and since the resin component is extremely reduced, it can suppress various problems caused by the resin component, and has an appropriate adhesion. A coating film having excellent prevention performance can be obtained.

  Hereinafter, the present invention will be described in detail.

  The tin oxide-based ultrafine particles, which are essential components of the antistatic coating agent of the present invention, mean tin oxide-based compounds, or solvates and coordination compounds thereof, and generally have an average particle size of 200 nm or less. It has a sharp particle size distribution. Specific examples of the tin oxide ultrafine particles include a composite of tin oxide, antimony-doped tin oxide, indium-doped tin oxide, tin oxide-doped indium, aluminum-doped tin oxide, tungsten-doped tin oxide, titanium oxide-cerium oxide-tin oxide. And a composite of titanium oxide and tin oxide, and solvates thereof and ultrafine particles of coordination compounds can also be used. Tin oxide ultrafine particles are particularly preferred from the viewpoint of transparency and cost of the coating film.

  The method for producing the above tin oxide ultrafine particles is not particularly limited. For example, a method of hydrolyzing or thermally hydrolyzing metal tin or a tin compound, a method of alkaline hydrolysis of an acidic solution containing tin ions, and a solution containing tin ions. Any method such as ion exchange using an ion exchange membrane or an ion exchange resin can be used.

  The tin oxide ultrafine particles used in the antistatic coating agent of the present invention are used as a sol dispersed in advance in water or a solvent containing water as a main component.

  The sol here is a fluid system in which a solid dispersoid having a size of about 1 to 100 nm is dispersed in a liquid dispersion medium, and the solid dispersoid has an active Brownian motion. It is dispersed to the extent that it passes through the filter paper or its state. The method for producing the tin oxide-based ultrafine particle sol is not particularly limited, but is generally dispersed and stabilized by a basic compound, and such a method is preferable from the viewpoint of ease of handling.

  The number average particle diameter of the tin oxide ultrafine particles in the sol is preferably 50 nm or less, more preferably 30 nm or less, and still more preferably 20 nm or less. The volume average particle diameter is preferably 200 nm or less, more preferably 50 nm or less, and even more preferably 20 nm or less. When the number average particle diameter of the tin oxide compound exceeds 50 nm or the volume average particle diameter exceeds 200 nm, not only is it difficult to form a thin coating film uniformly, but the transparency of the coating film is reduced. Adhesion with the substrate may be reduced.

  Commercially available sols of tin oxide ultrafine particles can also be used. For example, as the tin oxide aqueous dispersion, there is EPS-6 manufactured by Yamanaka Chemical Co., Ltd., and as the antimony-doped tin oxide aqueous dispersion, there is SN100D manufactured by Ishihara Sangyo Co., Ltd.

  As the basic compound contained in the sol, ammonia or an organic amine compound that volatilizes during the formation of the coating film is preferable from the viewpoint of the strength of the coating film, and among them, an organic amine compound having a boiling point of 30 to 250 ° C. is preferable, and more preferably 50 to It is an organic amine compound at 200 ° C. When the boiling point is less than 30 ° C., handling becomes difficult. When the boiling point exceeds 250 ° C., it is difficult to disperse the organic amine compound from the coating film by drying, and the strength of the coating film may decrease.

  Specific examples of the organic amine compound include triethylamine, N, N-dimethylethanolamine, aminoethanolamine, N-methyl-N, N-diethanolamine, isopropylamine, iminobispropylamine, ethylamine, diethylamine, and 3-ethoxypropylamine. , 3-diethylaminopropylamine, sec-butylamine, propylamine, methylaminopropylamine, 3-methoxypropylamine, monoethanolamine, morpholine, N-methylmorpholine, N-ethylmorpholine and the like.

  It is essential that the antistatic coating agent of the present invention contains a hydrophilic organic solvent. As the hydrophilic organic solvent, those having a solubility in water at 20 ° C. of 50 g / L or more are preferable, and specific examples thereof include methanol, ethanol, n-propanol, isopropanol, n-butanol, methyl ethyl ketone, cyclohexanone, tetrahydrofuran, Examples thereof include dioxane, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monobutyl ether, and methanol, ethanol, n-propanol, and isopropanol are particularly preferable from the viewpoint of liquid stability and price.

  The hydrophilic organic solvent needs to be contained in an amount of 50% by mass or more in the antistatic coating agent. Although the addition amount changes with solid content concentration, 50-80 mass% is preferable and 60-70 mass% is more preferable. When the amount of the hydrophilic organic solvent is less than 50% by mass, the coating agent does not have thixotropy, and thus sufficient coating properties may not be exhibited. When the amount exceeds 80% by mass, the tin oxide ultrafine particles aggregate. There is a case.

  Further, the tin oxide ultrafine particle concentration in the antistatic coating agent of the present invention is required to be 1% by mass or more and 8% by mass or less in order to achieve both stability and antistatic performance. The tin oxide ultrafine particle concentration is preferably 2 to 6% by mass. When the solid content concentration is 1% by mass or less, a coating film having a sufficient thickness may not be formed when applied to a substrate, and the antistatic performance may not be exhibited, and it becomes difficult to control the viscosity to an appropriate level. The coating itself may be difficult. On the other hand, when it exceeds 8 mass%, it may aggregate.

The viscosity of the antistatic coating agent in the present invention is related not only to the finished appearance but also to other coating film performance and work performance. Therefore, the viscosity (apparent viscosity) of the antistatic coating agent is preferably 50 to 500 mPa · s, more preferably 100 to 400 mPa · s at 20 ° C. under a high shear rate (20.40 s ⁻¹ ). 150 to 300 mPa · s is most preferable. When the viscosity is higher than 500 mPa · s, the coating film becomes uneven, and the finished appearance tends to deteriorate. On the other hand, it is preferable that the viscosity at a high shear rate is low, but if it is too low and lower than 50 mPa · s, it is difficult to obtain an appropriate coating thickness due to excessive wetting and spreading.

The antistatic coating agent according to the present invention preferably has a viscosity of 100 to 10,000 mPa · s under a low shear rate (1.02 s ⁻¹ ) in addition to the viscosity at the high shear rate described above. More preferably, it is 1000 to 7000 mPa · s. The antistatic coating agent that satisfies both the preferred viscosity range under the low shear rate and the preferred viscosity range under the high shear rate has thixotropy (thixotropy). By imparting thixotropy to the antistatic coating agent, it is possible to increase the viscosity at a low shear rate (at rest) to suppress excessive wetting and spread, while maintaining a low viscosity at a high shear rate. Thereby, it is possible to impart sufficient coatability and obtain a good finished appearance without lowering the adhesion even to a base material that has not been subjected to physical surface treatment such as corona discharge treatment. . When the viscosity at a low shear rate is higher than 10,000 mPa · s, handling becomes difficult and workability is lowered. On the other hand, when it is lower than 100 mPa · s, the wetting spread resistance is lowered, and for example, it is difficult to obtain a thick film. The adjustment of the viscosity is performed mainly by the content of the hydrophilic organic solvent, and can be further performed by appropriately adjusting the total solid content concentration. The viscosity tends to be low when the content of the hydrophilic organic solvent is low or the solid content concentration is low, and the viscosity tends to be high when the content of the hydrophilic organic solvent is high or the solid content concentration is high. .

  The antistatic coating agent of the present invention is prepared, for example, by mixing an aqueous dispersion of tin oxide ultrafine particles and a hydrophilic organic solvent.

  In preparing the antistatic coating agent, the apparatus for mixing the aqueous dispersion of tin oxide-based ultrafine particles and the hydrophilic organic solvent is not particularly limited, and a known stirring apparatus can be used. The dispersibility of the liquid mixture as described above is generally good, and the mixing operation is very short and simple.

  The antistatic coating agent of this invention is 1 mass part or less with respect to 100 mass parts of tin oxide type ultrafine particles as a resin component. Preferably it is 0.1 mass part or less, More preferably, it is not using a resin component. In the present invention, although the resin component is extremely reduced as described above, appropriate adhesion and coating properties are exhibited.

  As the resin component referred to in the present invention, generally used as a binder for a coating agent or an adhesive, for example, a polyester resin, a polyolefin resin, an acrylic resin, a polyurethane resin, a polyamide resin, a polystyrene resin, a polyimide resin, Examples thereof include polycarbonate resin and polyarylate resin.

  To the antistatic coating agent of the present invention, a lubricant, pigment or dye, ultraviolet absorber, leveling agent, antifoaming agent, anti-waxing agent, dispersant, etc. may be added as long as the effects of the present invention are not impaired. it can.

  From the point of adhesion of the coating film, the content of non-volatile compounds such as surfactants (cationic emulsifiers, anionic emulsifiers, nonionic emulsifiers or amphoteric emulsifiers) and protective colloid compounds in the antistatic coating agent is tin oxide. The amount is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, still more preferably 1 part by mass or less, and most preferably not added, per 100 parts by mass of the system ultrafine particles. This is because such a compound remains in the coating film even after drying, and may degrade the coating film performance over time.

  As coating methods, for example, gravure roll coating, reverse roll coating, wire bar coating, lip coating, air knife coating, curtain flow coating, spray coating, dip coating, brush coating, etc., uniformly on the surface of various substrates. After coating and setting near room temperature as necessary, a uniform resin coating can be formed in close contact with the surface of various substrates by subjecting it to a drying treatment. As a heating device at this time, a normal hot air circulation type oven, an infrared heater, or the like may be used. In addition, the heating temperature and the heating time are appropriately selected depending on the characteristics of the base material to be coated. However, when the resin base material has a melting point, the heating temperature is considered in view of economy. Is preferably 10 ° C. to the melting point of the substrate, more preferably 20 ° C. to the melting point of the substrate, particularly preferably 30 ° C. to the melting point of the substrate, and the heating time is preferably 1 second to 20 minutes. Second to 15 minutes are more preferable, and 10 seconds to 10 minutes are particularly preferable.

In the present invention, the coating amount of the coating film is preferably from 0.1 to 1 g / ^{m 2,} more preferably ^{0.2~0.8g / m 2, 0.3~0.5g / m} 2 is Further preferred. When the coating amount exceeds 1 g / m ² , the transparency of the coating film and the substrate adhesion deteriorate. When the coating amount is less than 0.1 g / m ² , the antistatic performance deteriorates. The antistatic performance can be evaluated by a surface specific resistance value, and from the viewpoint of suppressing adhesion of dust, dust and the like, it is practically preferable if this value is less than 10 ¹⁰ Ω / □.

  The substrate used in the present invention is not particularly limited, and examples thereof include a molded body made of resin, a film, a sheet, synthetic paper, and glass. As the resin, a thermoplastic resin is preferable. From the viewpoint of sufficiently exerting the coating film performance, it is preferable to use a resin film or sheet (hereinafter referred to as a film) having a haze of 10% or less, more preferably 5% or less. Examples of the resin include polyolefin resins such as polyethylene, polypropylene, ionomer, ethylene-vinyl acetate copolymer and ethylene-vinyl alcohol copolymer, cyclic polyolefin resins, polyamide resins such as nylon 6, nylon 66 and nylon 46, polyethylene terephthalate ( Hereinafter, PET), A-PET, polyethylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate, polyester resin such as polylactic acid, polystyrene resin, polyimide resin, polycarbonate resin, poly Examples include arylate resin, epoxy resin, phenol resin, melamine resin, urea resin, and mixtures thereof. Examples of the film include a single body such as a film made of the resin or a laminate such as a film. Since the antistatic coating agent of the present invention is excellent in wettability, the substrate need not be subjected to physical surface treatment, but may be applied. Here, examples of the method for performing the physical surface treatment include a treatment method using light, an electron beam, an ion beam, and plasma.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto. In addition, as a base material, PP sheet (300 micrometers in thickness, Super Pure Array by Idemitsu Unitech Co., Ltd.) (henceforth, SP), A-PET sheet (Mitsubishi Chemical Corporation, thickness 200 micrometers) (henceforth AP), stretched polypropylene film ( Tosero Co., Ltd., OP U-1, thickness 20 μm) (hereinafter, PP) or biaxially stretched polyethylene terephthalate film (Unitika's Emblet PET12, thickness 12 μm) was used. Various evaluations were performed after the coated film was left for 1 day in an atmosphere of a temperature of 23 ° C. and a humidity of 65%.

(1) Antistatic property Based on JIS-K6911, the surface resistivity value of the coating film of the coating film (laminated body) was measured at a temperature of 23 using a digital ultrahigh resistance / microammeter R83340 manufactured by Advantest Corporation. The measurement was performed in an atmosphere of 65 ° C. and a humidity of 65%.

(2) Viscosity and shear rate
It measured at 20 degreeC using BROOKFIELD ENGINEERING LABORATORIES, INC. B-type viscous clock SYNCHRO-LECTRIC VISCOMETER Model LVT (Spindle 31). The shear rate was converted by multiplying the rotor speed (3 rpm and 60 rpm) by 0.34. In addition, in the case of less than 5 mPa · s, since the measurement accuracy is lowered and the numerical value cannot be determined, the measurement result is “less than 5 mPa · s”.

(3) Solid Content Concentration of Aqueous Dispersion An appropriate amount of the antistatic coating agent was weighed and heated at 150 ° C. until the mass of the residue (solid content) reached a constant weight to determine the solid content concentration.

(4) Amount of coating film (amount of coating)
A predetermined amount of the coating liquid of the present invention was applied to a substrate whose area and mass were measured in advance, and dried at 60 ° C. for 30 seconds. The mass of the obtained laminate was measured, and the coating amount was determined by subtracting the mass of the base material before coating. The coating amount per unit area (g / m ² ) was calculated from the coating amount and the coating area.

(5) Coating property The state when the antistatic coating agent was applied to the substrate was visually determined.
○: Uniform coating is possible, △: Partial repelling is confirmed, ×: Coating agent is repelled remarkably

(6) Haze Based on JIS-K7361-1, the haze measurement of the coating film (laminated body) was performed using the turbidimeter (Nippon Denshoku Industries Co., Ltd. make, NDH2000). However, this evaluation value includes the turbidity (SP: 3.1%, AP: 0.7%, PP: 2.4%, PET: 2.8%) of the base film used in each example. It is out.

(7) Adhesiveness After affixing an adhesive tape (TF-12 manufactured by Nichiban Co., Ltd.) to the coating film surface of the coat film, the tape was peeled off vigorously. The state of the coating film surface was visually observed and evaluated as follows.
○: No peeling at all.
Δ: Some peeling occurred.
X: All peeled off.

(8) Particle size The number average particle size and volume average particle size of the tin oxide-based ultrafine particles were measured by a dynamic light scattering method using a Microtrac particle size distribution analyzer UPA150 (Model No. 9340) manufactured by Nikkiso Co., Ltd.

<< Preparation of tin oxide sol >>

(Preparation of tin oxide sol)
Dissolve 35 g (0.1 mol) of stannic chloride pentahydrate in 200 ml of water to make a 0.5 M aqueous solution, and add 28% aqueous ammonia with stirring to add white tin oxide with a pH of 1.5 An ultrafine particle-containing slurry was obtained. The obtained tin oxide ultrafine particle-containing slurry is heated to 70 ° C. and then naturally cooled to around 50 ° C., and then pure water is added to obtain a 1 L tin oxide ultrafine particle-containing slurry, and solid-liquid separation is performed using a centrifuge. went. After adding 800 ml of pure water to this water-containing solid content, stirring and dispersing with a homogenizer, washing was performed by solid-liquid separation using a centrifuge. 75 ml of pure water was added to the water-containing solid content after washing to prepare a tin oxide ultrafine particle-containing slurry.

  To the obtained tin oxide ultrafine particle-containing slurry, 3.0 ml of triethylamine was added and stirred, and when the transparency appeared, the temperature was raised to 70 ° C., then the heating was stopped and the solid content was cooled to 11.5 mass. Tin oxide sol Z-1 containing 1% of organic amine as a dispersion stabilizer was obtained. The number average particle diameter and the volume average particle diameter were 8.5 nm and 9.8 nm, respectively.

Example 1
After adding water (4.6 g) to tin oxide sol Z-1 (8.7 g), 20.0 g of n-propanol (amount in which the total amount of solvent contained in the antistatic coating agent is 60% by mass) is added. An antistatic coating agent having a solid content concentration of 3.0% by weight was obtained. When the viscosity was measured, the viscosity at a shear rate of 20.40 s ⁻¹ was 148 mPa · s, the viscosity at a shear rate of 1.02 s ⁻¹ was 1400 mPa · s, and it was thixotropic. After coating the antistatic coating agent prepared on the corona-treated surface of PET so that the coating amount (coating amount) after drying is 0.2 g / m ² , the coating film is dried at 60 ° C. for 30 seconds. Got.

Examples 2-6
By adding 13.0 g of n-propanol (total amount of the solvent contained in the antistatic coating agent is 60% by mass) to tin oxide sol Z-1 (8.7 g), the solid content concentration is 4.6% by weight. An antistatic coating agent was obtained. When the viscosity was measured, the viscosity at a shear rate of 20.40 s ⁻¹ was 408 mPa · s, the viscosity at a shear rate of 1.02 s ⁻¹ was 6900 mPa · s, and it was thixotropic. After coating the antistatic coating agent prepared on various substrates so that the coating amount (coating amount) after drying is 0.2 g / m ² , it is dried at 60 ° C. for 30 seconds to obtain a coated film. It was.

Example 7
After adding water (11.3 g) to tin oxide sol Z-1 (8.7 g), 30.0 g of n-propanol (amount in which the total amount of the solvent contained in the antistatic coating agent is 60% by mass) is added. An antistatic coating agent having a solid content concentration of 2.0% by weight was obtained. When the viscosity was measured, the viscosity at a shear rate of 20.40 s ⁻¹ was 58 mPa · s, the viscosity at a shear rate of 1.02 s ⁻¹ was 100 mPa · s, and it was thixotropic. After coating the antistatic coating agent prepared on the corona-treated surface of PET so that the coating amount (coating amount) after drying is 0.2 g / m ² , the coating film is dried at 60 ° C. for 30 seconds. Got.

Example 8
By adding 20.3 g of n-propanol (total amount of the solvent contained in the antistatic coating agent is 70% by mass) to tin oxide sol Z-1 (8.7 g), the solid content concentration is 3.4% by weight. An antistatic coating agent was obtained. When the viscosity was measured, the viscosity at a shear rate of 20.40 s ⁻¹ was 75 mPa · s, the viscosity at a shear rate of 1.02 s ⁻¹ was 900 mPa · s, and it was thixotropic. After coating the antistatic coating agent prepared on the corona-treated surface of PET so that the coating amount (coating amount) after drying is 0.2 g / m ² , the coating film is dried at 60 ° C. for 30 seconds. Got.

Comparative Example 1
After adding water (11.3 g) to tin oxide sol Z-1 (8.7 g), 13.3 g of n-propanol (amount in which the total amount of the solvent contained in the antistatic coating agent is 40% by mass) is added. An antistatic coating agent having a solid content concentration of 3.0% by weight was obtained. When the viscosity was measured, the viscosity at a shear rate of 20.40 s ⁻¹ was less than 5 mPa · s, and the viscosity at a shear rate of 1.02 s ⁻¹ was less than 5 mPa · s. Thixogenicity was not seen. An attempt was made to apply an antistatic coating agent prepared on the corona-treated surface of PET so that the coating amount (coating amount) after drying would be 0.2 g / m ^2. could not.

Comparative Example 2
After adding water (35.7 g) to tin oxide sol Z-1 (8.7 g), 66.7 g of n-propanol (amount that the total amount of the solvent contained in the antistatic coating agent is 60% by mass) is added. An antistatic coating agent having a solid content concentration of 0.9% by weight was obtained. When the viscosity was measured, the viscosity at a shear rate of 20.40 s ⁻¹ was less than 5 mPa · s, and the viscosity at a shear rate of 1.02 s ⁻¹ was less than 5 mPa · s. Thixogenicity was not seen. An attempt was made to apply an antistatic coating agent prepared on the corona-treated surface of PET so that the coating amount (coating amount) after drying would be 0.2 g / m ^2. could not.

  The results of Examples 1-8 and Comparative Examples 1-2 are summarized in Table 1.

As shown in Examples 1 to 8, the antistatic coating agent of the present invention was excellent in antistatic properties and transparency. Furthermore, it has been found that even if it does not contain a resin component, it has appropriate adhesion. It was also confirmed that the performance did not depend on the presence or absence of the substrate and the surface treatment (Examples 2 to 6). On the other hand, when the content of the hydrophilic organic solvent is outside the range of the present invention, the viscosity is greatly reduced, and stable coating properties cannot be obtained and the antistatic property is deteriorated (Comparative Example 1). Further, when the tin oxide ultrafine particle concentration is out of the range of the present invention, the viscosity is greatly reduced, a stable coating property cannot be obtained, and a sufficient antistatic layer cannot be formed (Comparative Example 2). .

Claims (5)

It contains tin oxide ultrafine particles, a hydrophilic organic solvent, and water, the tin oxide ultrafine particle concentration is 1% by mass or more and 8% by mass or less, and the content of the hydrophilic organic solvent is 50% by mass or more. The content of the resin component is 1 part by mass or less based on 100 parts by mass of the tin oxide ultrafine particles. The antistatic coating agent according to claim 1, which is substantially free of a resin component. The antistatic coating agent according to claim ¹ , wherein the viscosity at 20 ° C. and a shear rate of 20.40 s ⁻¹ is 50 to 500 mPa · s. The viscosity at 20 ° C. and a shear rate of 20.40 s ⁻¹ is 50 to 500 mPa · s, and the viscosity at 20 ° C. and a shear rate of 1.02 s ⁻¹ is 100 to 10,000 mPa · s. The antistatic coating agent in any one of Claims 1-3. The laminated body which laminated | stacked the coating film formed by apply | coating and drying the antistatic coating agent in any one of Claims 1-4 on a base material.