JPH0770479A - Photo-setting electroconductive coating composition and antistatic electromagnetic wave-shielding laminate produced by using the composition - Google Patents

Abstract

PURPOSE:To provide a photo-setting electroconductive coating composition capable of forming a coating film having excellent electric conductance, transparency and scratch resistance and provide an antistatic electromagnetic wave- shielding laminate coated with the coating composition. CONSTITUTION:This photo-setting electroconductive coating composition contains (A) 100 pts.wt. of a (meth)acrylate compound having >=2 acryloyl groups or methacryloyl groups in the molecule, (B) 100-500 pts.wt. of electrically conductive powder having an average particle diameter of 0.05-2mum and composed of barium sulfate coated with antimony-doped tin oxide, (C) 5-100 pts.wt. of a dispersing agent, (D) 0.1-10 pts.wt. of a photo-polymerization initiator and (E) 500-3,000 pts.wt. of an organic solvent. Since barium sulfate having a refractive index of 1.6 which is close to that of the resin is used as the electrically conductive powder, the transparency is maintained even by increasing the thickness of the coating layer to obtain a coating film having excellent electrical conductance, transparency and scratch resistance.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is a coating film which is easily cured by actinic rays such as ultraviolet rays or visible rays to have excellent conductivity and transparency (total light transmittance), abrasion resistance and hardness. The present invention relates to a photocurable conductive coating composition capable of forming a film and an antistatic electromagnetic wave shielding laminate obtained by applying the composition.

[0002]

2. Description of the Related Art Conductive polymers have been used for their properties such as storage containers for semiconductor wafers, electronic / electrical members, floor materials and wall materials in semiconductor manufacturing factories, taking advantage of their properties. On the other hand, synthetic resin moldings may be coated with paint containing carbon powder or metal powder to impart conductivity to polymers, or carbon powder, carbon fibers, metal fibers, etc. may be kneaded into synthetic resin for molding. It is being appreciated. However, the synthetic resin to which the conductivity is imparted by the above method is generally opaque and the contents cannot be seen through, and there is a drawback in that a portion requiring antistatic cannot be used as a window.

In order to solve this drawback, for example, JP-A-57 / 57
JP-A-85866 discloses a paint containing a conductive fine powder containing tin oxide as a main component in a paint binder. This paint can surely form a coating film which is transparent and has an antistatic function, but the coating film obtained cannot generally exhibit scratch resistance because the coating binder is composed of a thermoplastic resin. Further, Japanese Patent Application Laid-Open No. 60-60166 discloses a paint containing a conductive fine powder containing tin oxide as a main component in a paint binder containing a (meth) acrylic oligomer as a main component. This paint was capable of forming a coating film excellent in conductivity, transparency (total light transmittance), scratch resistance and solvent resistance.

[0004]

However, such a coating material has a drawback that the transparency (total light transmittance) is lowered by coloring with tin oxide when the film thickness of the coating film is increased. Therefore, in order to impart sufficient scratch resistance to a substrate having a relatively low surface hardness such as polyvinyl chloride and polycarbonate, it is necessary to increase the thickness of the coating film, and as a result of thickening the coating film, There is a problem in that tin oxide causes coloration and the characteristic transparency (total light transmittance) is lowered.

The present invention has been made by paying attention to such problems, and the problem is that it is easily cured by active rays such as ultraviolet rays or visible rays and has excellent conductivity and transparency (total). (Light transmittance), a photocurable conductive coating composition capable of forming a coating film having excellent scratch resistance and hardness, and an antistatic electromagnetic wave formed by applying the photocurable conductive coating composition It is to provide a shield laminate.

[0006]

[Means for Solving the Problems] That is, the invention according to claim 1 is such that 100 parts by weight of a (meth) acrylate compound having at least two acryloyl groups or methacryloyl groups in a molecule is doped with antimony. Conductive powder made of barium sulfate coated with tin oxide and having an average particle size of 0.05 to 2 μm: 100 to 500
Parts by weight, dispersant: 5 to 100 parts by weight, photopolymerization initiator:
0.1 to 10 parts by weight, and organic solvent: 500 to 300
The present invention relates to a photocurable conductive coating composition containing 0 part by weight.

In the photocurable conductive coating composition according to the present invention, barium sulfate coated with antimony-doped tin oxide is used as the conductive powder of the conductive coating composition. With the application,
Since this powder has a refractive index of 1.6, which is close to that of a resin and has high transparency, it has an advantage that the transparency (total light transmittance) is unlikely to decrease even if the thickness of the coating film to be formed is set large. .

Next, the invention according to claim 2 presupposes the photocurable conductive coating composition according to the invention of claim 1,
A predetermined amount of the above photocurable conductive coating composition is applied on the surface of an electromagnetic wave shielding resin plate formed by disposing a conductive woven fabric or a conductive non-woven fabric on the surface of or inside a transparent synthetic resin plate and then dried. The present invention relates to an antistatic electromagnetic wave shielding laminate, which is characterized by being photocured.

In such a technical means, the photocurable conductive coating composition contains 100 parts by weight of a (meth) acrylate compound having at least two or more acryloyl groups or methacryloyl groups in the molecule, and antimony is added thereto. Conductive powder consisting of barium sulphate coated with doped tin oxide and having an average particle size of 0.05 to 2 μm:
100 to 500 parts by weight, dispersant: 5 to 100 parts by weight, photopolymerization initiator: 0.1 to 10 parts by weight, and organic solvent: 5
It contains 100 to 3000 parts by weight.

First, the (meth) acrylate compound is a (meth) acrylate compound having at least two or more acryloyl groups or methacryloyl groups in the molecule and has excellent abrasion resistance and high hardness. Examples of such (meth) acrylate compounds include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, nonaethylene glycol di ( (Meth) acrylate, polyethylene glycol di (meth)
Acrylate, tripropylene glycol di (meth) acrylate, tetrapropylene glycol di (meth) acrylate, nonapropylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, 2,2-bis [4- (meth) acryloxy Diethoxy) phenyl] propane, bifunctional (meth) acrylate such as 1,6-bis [3- (meth) acryloxy-2-hydroxypropyl] -hexanediol, or pentaerythritol tri (meth) acrylate, trimethylolpropane tri Trifunctional (meth), such as (meth) acrylate, glycerol tri (meth) acrylate, tris [(meth) acryloxyethyl] isocyanurate
Examples thereof include tetrafunctional (meth) acrylates such as acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, and dipentaerythritol hexa (meth) acrylate.

An acrylic urethane oligomer having two or more (meth) acryloyl groups at the terminal of the molecule and a urethane bond in the molecule is preferably used because the resulting coating film has excellent scratch resistance.

The urethane oligomer having a (meth) acryloyl group at its molecular end is prepared, for example, by reacting a compound having two or more isocyanate groups in one molecule with an acrylate or methacrylate having active hydrogen. It

Examples of the compound having two or more isocyanate groups in one molecule include m-phenylene diisocyanate, p-phenylene diisocyanate, toluene-2,4-diisocyanate, toluene-2,6-diisocyanate and toluene-2. , 5-diisocyanate, toluene-3,5-diisocyanate, m-xylylene diisocyanate, p-xylylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, isophorone diisocyanate, 4,4′-diphenylmethane diisocyanate,
4,4'-diisocyanate-3,3'-dimethylbiphenyl, 4,4'-diisocyanate-3,3'-dimethylbiphenylmethane and the like can be mentioned.

Examples of active hydrogen-containing (meth) acrylates include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate,
Glycerin di (meth) acrylate, 1,6-bis (3
-Acryloxy-2-hydroxypropyl) -hexyl ether, pentaerythritol tri (meth) acrylate, (meth) acrylic acid and the like can be mentioned.

The above (meth) acrylate compounds may be used alone or in combination. Further, it is preferable to add 10 to 100 parts by weight of this (meth) acrylate compound to 100 parts by weight of the conductive powder. 10
If it is less than 100 parts by weight, the cross-linking density of the binder resin is low and the coating film cannot have abrasion resistance and solvent resistance.
This is because if the content is more than the amount by weight, the content of the conductive powder decreases and the conductivity deteriorates.

Next, the conductive powder blended in the photocurable conductive coating composition according to the present invention is an average particle consisting of barium sulfate coated with antimony-doped tin oxide. It is a conductive powder having a diameter of 0.05 to 2 μm, for example, the product name “Pastran T
ype-IV ”.

When the average particle size of the conductive powder is smaller than 0.05 μm, the conductivity of the resulting coating film is lowered, and when the average particle size is larger than 2 μm, the smoothness of the coating film is lowered. Poor transparency. Moreover, the compounding ratio of the conductive powder is set to 100 to 500 parts by weight, preferably 200 to 500 parts by weight, relative to 100 parts by weight of the (meth) acrylate compound. If it is less than 100 parts by weight, the conductivity of the coating film will be lowered, and if it exceeds 500 parts by weight, the transparency (total light transmittance) and mechanical strength of the coating film will be lowered.

In the photocurable conductive coating composition according to the first aspect of the present invention, a dispersant is added to improve the dispersibility of the conductive powder. As such a dispersant, those having a surface active effect such as an organic acid and a polar group-containing polymer can be used. Further, it is preferable to apply a polyvinyl acetal resin as a dispersant because the transparency (total light transmittance) of the coating film and the storage stability of the coating material are improved. This polyvinyl acetal resin can be obtained, for example, by subjecting polyvinyl alcohol to a condensation reaction with an aldehyde to form an acetal. This acetalization is
In the presence of an acid catalyst such as hydrochloric acid, sulfuric acid or nitric acid, a precipitation method using an aqueous medium or a dissolution method using a solvent such as alcohol can be mentioned. In addition, polyvinyl acetate may be used as a raw material to prepare a polyvinyl acetal resin by simultaneously performing saponification and asulization.

Examples of the aldehyde to be condensed with the polyvinyl alcohol include formaldehyde,
Examples thereof include acetaldehyde, propionaldehyde, butyraldehyde, pentyl aldehyde, hexyl aldehyde, heptyl aldehyde, octyl aldehyde, 2-ethylhexyl aldehyde, decyl aldehyde and cyclohexyl aldehyde. These aldehydes may be used alone or in combination.

In addition to the acetal moiety, one of all hydroxyl groups is
You may contain an acetyl group in the ratio of 0% or less. The residual hydroxyl group in the acetal resin is preferably in the range of 2 to 60% of the total hydroxyl groups, and more preferably in the range of 5 to 40% in the dish.
When the residual hydroxyl group is less than 2%, the desired dispersion effect of the conductive powder is lowered, and when it exceeds 60%, the chemical resistance of the coating film is deteriorated.

Regarding the blending ratio of the dispersant such as polyvinyl acetal resin, the (meth) acrylate compound:
5 to 100 parts by weight, preferably 1 to 100 parts by weight
0 to 50 parts by weight is added. If the blending ratio is less than 5 parts by weight, the effect of dispersing the conductive powder and the transparency (total light transmittance) of the coating film are lacking. If it exceeds 100 parts by weight, the coating film lacks scratch resistance, hardness and chemical resistance.

The photopolymerization initiator used in the present invention is not particularly limited as long as it has a property of initiating the polymerization by active rays such as ultraviolet rays and visible rays. Examples of such photopolymerization initiators include sulfides such as sodium dimethyldithiocarbamate, sodium methyldithiocarbamate sulfide, diphenyl monosulfide, dibenzothiazoyl monosulfide and disulfide; thioxanthone, 2-ethylthioxanthone, 2- Thioxanthone derivatives such as chlorothioxanthone and 2,4-diethylthioxanthone; azo compounds such as hydrazone and azobisisobutyronitrile; diazo compounds such as benzenediazonium salts; benzoin, benzoin methyl ether, benzoin ethyl ether, benzophenone, dimethylaminobenzophenone , Michler's ketone, benzyl anthraquinone, t-butyl anthraquinone, 2-methyl anthraquinone, 2-ethyl anthraquinone Down, 2-aminoanthraquinone, aromatic carbonyl compounds such as 2-chloro-anthraquinone; p-dimethylaminobenzoic acid methyl, p
-Dialkylaminobenzoic acid esters such as ethyl dimethylaminobenzoate, butyl p-dimethylaminobenzoate and isopropyl p-diethylaminobenzoate; benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, cumene hydroperoxide And the like; 9-phenylacridine, 9-p-methoxyphenylacridine, 9-acetylaminoacridine, benzacridine, and other acridine derivatives;
Phenazine derivatives such as 0-dimethylbenzphenazine, 9-methylbenzphenazine and 10-methoxybenzphenazine; quinoxaline derivatives such as 6,4 ′, 4 ″ -trimethoxy-2,3-diphenylquinoxaline;
4,5-Triphenylimidazoyl dimer, 2-nitrofluorene, 2,4,6-triphenylpyrylium boron tetrafluoride salt, 2,4,6-tris (trichloromethyl)
Examples include -1,3,5-triazine, 3,3'-carbonylbiscoumarin, and thiomichler ketone.

In the present invention, the tin oxide content is 350 nm.
Since the following ultraviolet rays are strongly absorbed and the coating film is strongly colored at 400 nm or more, the maximum absorption wavelength of the photopolymerization initiator is 3
Those in the range of 50 to 400 nm are preferable.

Further, an amine compound may be used in combination in order to prevent a decrease in sensitivity due to oxygen inhibition. Such an amine compound is not particularly limited as long as it is a non-volatile compound such as an aliphatic amine compound or an aromatic amine compound, and for example, triethanolamine, methyldiethanolamine and the like are often used, and the above dialkylaminobenzoic acid is used. Amino group-containing photopolymerization initiators such as acid esters and Michler's ketone can also be used as amine compounds.

In the present invention, the photopolymerization initiator is
The above (meth) acrylate compound: added in an amount of 0.1 to 10 parts by weight based on 100 parts by weight. 0.1
If the amount is less than parts by weight, the photopolymerization rate is slow, and irradiation with actinic rays for a long time is required to obtain sufficient scratch resistance and hardness of the coating film, and sometimes uncured. Also, 10
If it is more than the weight part, the conductivity of the coating film, scratch resistance, heat resistance,
The weather resistance and the like will decrease.

In the photocurable conductive coating composition according to the first aspect of the invention, an organic solvent is added to improve the dispersibility of the conductive powder and the coating property of the coating. The organic solvent used is not particularly limited, but one having a boiling point of about 80 to 160 ° C. is preferable. If the boiling point is less than 80 ° C, the concentration or viscosity of the coating may change due to evaporation of the solvent during storage or coating of the coating, while if the boiling point exceeds 160 ° C, the drying process may take time. This is because it may take some time. Also, those having strong volatility are not preferable because the concentration and viscosity of the paint may change due to evaporation of the solvent during storage or coating of the paint. From the viewpoint of affinity with the conductive powder, a solvent containing oxygen is preferable.

Specific examples of the organic solvent include methanol, ethanol, isopropyl alcohol, cyclohexanone, ethylene glycol monomethyl ether (methyl cellosolve), ethylene glycol monoethyl ether (ethyl cellosolve), diethylene glycol dimethyl ether, butyl acetate, and the like. Suitable examples include isopropyl acetone, methyl ethyl ketone, methyl isobutyl ketone, and anisole. These may be used alone or in combination of two or more.
The organic solvent is added in a mixing ratio of 500 to 3000 parts by weight based on 100 parts by weight of the (meth) acrylate compound. If it is less than 500 parts by weight, the transparency of the coating film and the storage stability of the coating composition will be reduced, while if it exceeds 3000 parts by weight, the viscosity of the coating composition will be too low and the coatability will be reduced, or the conductive powder will settle. Because it will be easier.

In the photocurable conductive coating composition according to the invention of claim 1, the (meth) acrylate compound, the conductive powder, the dispersant, the photopolymerization initiator, and
In addition to the essential constituents of the organic solvent, various additions such as UV absorbers, antioxidants, thermal polymerization inhibitors, leveling agents, surface modifiers, defoaming agents, etc., within the range that does not impair physical properties, if necessary. Agents may be added.

The preparation of the photocurable conductive coating composition according to the first aspect of the present invention is carried out, for example, by adding a (meth) acrylate compound, a photopolymerization initiator and the like to an organic solvent and dissolving them, and then polyvinyl. It is carried out by adding a dispersant such as an acetal resin and a conductive powder and further mixing and dispersing.
For the dispersion, equipment normally used for dispersing or blending the conductive powder in order to sufficiently disperse the conductive powder in the coating material, such as a sand mill, a ball mill, an attritor, a high-speed rotary stirring device,
Three rolls etc. are used.

Claim 1 thus prepared and obtained
The photocurable conductive coating composition according to the invention described above is used by being applied to an object by a general coating method such as a spray method, a bar coating method, a doctor blade method, a roll coating method, and a dipping method. Examples of the object include a vinyl chloride, polycarbonate, polymethacrylate, plastic plate such as ABS resin, or a plastic film. Further, a plate or a film made of an inorganic substance such as glass can also be an object. After drying
The photocurable conductive coating composition is cured by an actinic ray such as ultraviolet rays to form a coating film, and a light source used for ultraviolet ray irradiation includes a high pressure mercury lamp and a metal halide lamp.

Next, the antistatic electromagnetic wave shielding laminate according to the invention of claim 2 is formed by disposing a conductive woven cloth or a conductive non-woven cloth on the surface or inside of a transparent synthetic resin plate. The above-mentioned claim 1 is formed on the surface of the resin plate
An antistatic transparent cured coating film can be formed by applying a predetermined amount of the photocurable conductive coating composition according to the invention described above, drying it with hot air, infrared rays or the like and then photocuring it. At this time, the thickness of the antistatic transparent cured coating film formed is 1.5 to
The thickness may be set to 5 μm, more preferably 2 to 4 μm.
If the coating film is thinner than 1.5 μm, the antistatic property and scuff resistance are deteriorated. Further, if the coating film is thicker than 5 μm, the transparency becomes low. Also, the amount of UV irradiation during curing is
Depending on the type of application, it is usually 1000 mJ / cm ²
That is all. Further, the surface of the obtained coating film may be polished and finished by buffing or the like, if necessary. By buffing, the transparency of the coating film is improved and a product having an excellent appearance can be manufactured.

[0032]

According to the photocurable conductive coating composition of the present invention, the (meth) acrylate compound having at least two or more acryloyl groups or methacryloyl groups in the molecule: 100 parts by weight, Conductive powder of barium sulfate coated with antimony-doped tin oxide and having an average particle size of 0.05 to 2 μm: 100
-500 parts by weight, dispersant: 5-100 parts by weight, photopolymerization initiator: 0.1-10 parts by weight, and organic solvent: 500-
It is characterized by containing 3000 parts by weight.

In this composition, barium sulfate coated with antimony-doped tin oxide was applied as the conductive powder, and this powder had a refractive index of 1.6 and was transparent to a resin. Therefore, the transparency (total light transmittance) is unlikely to decrease even if the thickness of the coating film to be formed is set to be large.

Therefore, since the thickness of the coating film can be set large, it is possible to form a coating film having excellent transparency, scuff resistance, antistatic property and hardness.

According to the second aspect of the present invention, there is provided an antistatic electromagnetic wave shielding laminate, in which an electroconductive woven fabric or an electroconductive nonwoven fabric is disposed on or inside a transparent synthetic resin plate. A predetermined amount of the photocurable conductive coating composition according to claim 1 is applied and dried on the surface of the flexible resin plate, and photocured.
It is possible to provide an antistatic electromagnetic wave shielding laminate that satisfies transparency, scuff resistance and antistatic properties.

[0036]

EXAMPLES Examples of the present invention will be described in detail below.

Examples 1 and 2 Comparative Examples 1 and 2 Predetermined amounts of dipentaerythritol hexaacrylate or pentaerythritol triacrylate and 0.2 parts by weight of hydroquinone shown in Table 1 and 4 parts by weight of 2,4-diethylthioxanthone. And ethyl p-dimethylaminobenzoate 4
Part by weight was dissolved in a predetermined amount of ethyl cellosolve or cyclohexanone shown in Table 1 and supplied to an attritor.
While stirring this, the conductive powder in the predetermined amount shown in Table 1 and the ratio of residual hydroxyl groups to all hydroxyl groups was 35%.
Then, a polyvinyl acetal resin having a degree of polymerization of 2400 was added and dispersed for 10 hours to prepare a photocurable conductive coating composition.

The obtained coating composition was applied onto a transparent plate of acrylic resin, vinyl chloride resin or polycarbonate by a bar coater so that the film thickness after drying would be 2 μm and 4 μm. Drying was performed by hot air drying at 50 ° C. for 10 minutes. This was irradiated with light of 1800 mJ / cm ² by a high pressure mercury lamp to be ultraviolet-cured. The resulting coating has a diameter of 30c
The surface was buffed by applying a wool polisher of m at 3000 rpm.

[0039]

[Table 1] The surface resistivity of the above-mentioned coating film is determined by ASTM-D25.
7, total light transmittance, and haze ASTM-D100
3. The pencil hardness was evaluated by the test method based on JIS-K5400. In addition, a sliding test with a load of 1 kg / cm ² and 100 times of steel wool (# 0000) was performed.
The appearance of the coating film was evaluated on a scale of 1 ... Many scratches, 2 ... several scratches, 3 ... 2-3 scratches, 4 ... slight scratches, 5 ... no scratches. The obtained results are shown in Tables 2-5.

[0040]

[Table 2]

[Table 3]

[Table 4]

[Table 5] [Example 3] A conductive woven fabric was obtained by electrolessly plating nickel on a 150-mesh plain weave woven fabric using 30 denier polyester fiber (plating thickness 0.38 µm, 20
weight%).

The above conductive woven fabric is sandwiched between two 1.5 mm polyvinyl chloride resin plates and heated to 160 ° C. with a heat press to pressurize to 30 kg / cm ² to melt the two resin plates. As a result, an electromagnetic wave shield plate was manufactured in which the above conductive woven cloth was embedded inside and integrated.

Next, dipentaerythritol hexaacrylate: 100 parts by weight, hydroquinone: 0.2 parts by weight, 2,4-diethylthioxanthone: 4 parts by weight, dimethylaminoacetophenone: 4 parts by weight to ethyl cellosolve: 780 parts by weight. It was melted and placed in an attritor.

While stirring this, a conductive powder in which fine particle barium sulfate was coated with antimony-doped tin oxide (Mitsui Kinzoku's trade name "Pastran Type IV"): 30
0 parts by weight, residual hydroxyl content 35% and degree of polymerization 240
An acetoacetal resin of 0: 27 parts by weight was added and dispersed for 10 hours to prepare a photocurable conductive coating composition.

This coating composition was applied to the surface of the electromagnetic wave shield plate by a roll coater so that the film thickness when dried was 2.5 μm, and dried with hot air at 50 ° C. for 10 minutes. The irradiation amount of this is 1800 by the high pressure mercury lamp.
It was irradiated with ultraviolet rays so as to be cured at mJ / cm ² to form an antistatic transparent cured coating film. After forming this coating film on both surfaces, the surface was finished by buffing to prepare an antistatic electromagnetic wave shielding laminate.

The surface resistivity of the antistatic electromagnetic wave shielding laminate was measured by ASTM-D257, and the total light transmittance was measured by a test method based on ASTM-D1003. Further, as scratch resistance, steel wool (# 0000) was rubbed 100 times with a load of 500 g / cm ² , and the haze value was measured and used as a substitute evaluation. The results are shown in Table 6.

Example 4 An electromagnetic wave shield plate was prepared in the same manner as in Example 3.

Next, dipentaerythritol triacrylate: 100 parts by weight, hydroquinone: 0.2 parts by weight,
2,4-diethylthioxanthone: 4 parts by weight, dimethylaminoacetophenone: 4 parts by weight with ethyl cellosolve:
It was dissolved in 780 parts by weight and charged into an attritor.

While stirring this, conductive powder in which fine particle barium sulfate was coated with antimony-doped tin oxide (Mitsui Kinzoku's trade name "Pastran Type IV"): 40
0 parts by weight, residual hydroxyl content 35% and degree of polymerization 240
A photocurable conductive coating composition was prepared by adding 50 parts by weight of 0 acetoacetal resin and dispersing for 10 hours.

This coating composition was applied on the surface of the above-mentioned electromagnetic wave shield plate by a roll coater so that the film thickness when dried was 3.5 μm, and dried with hot air at 50 ° C. for 10 minutes. This was irradiated with a high pressure mercury lamp at 2000
It was irradiated with ultraviolet rays so as to be cured at mJ / cm ² to form an antistatic transparent cured coating film. After forming this coating film on both surfaces, the surface was finished by buffing to prepare an antistatic electromagnetic wave shielding laminate.

The antistatic electromagnetic wave shielding laminate was evaluated in the same manner as in Example 3. The results are also shown in Table 6.

[Comparative Example 3] An electromagnetic wave shield plate was prepared in the same manner as in Example 3.

Then, this electromagnetic wave shield plate was evaluated in the same manner as in Example 3. The results are also shown in Table 6.

[0053]

[Table 6]

[0054]

According to the invention of claim 1, the transparency,
It has the effect of forming a coating film having excellent scratch resistance, antistatic properties, and hardness.

According to the second aspect of the invention, there is an effect that an antistatic electromagnetic wave shielding laminate having transparency, scuff resistance and antistatic property can be provided.

Claims (2)

[Claims] 1. A (meth) acrylate compound having at least two acryloyl groups or methacryloyl groups in the molecule: 100 parts by weight of barium sulfate coated with antimony-doped tin oxide. Conductive powder having a diameter of 0.05 to 2 μm: 100 to 5
00 parts by weight, dispersant: 5 to 100 parts by weight, photopolymerization initiator: 0.1 to 10 parts by weight, and organic solvent: 500 to 3
A photocurable conductive coating composition, which contains 000 parts by weight. 2. The photocurable conductive paint according to claim 1, which is formed on the surface of or inside a transparent synthetic resin plate on which an electrically conductive woven fabric or an electrically conductive non-woven fabric is arranged, to form an electromagnetic wave shielding resin plate. An antistatic electromagnetic wave shielding laminate, comprising a predetermined amount of the composition coated, dried, and photocured.