JP2000174491A - Electromagnetic shield light-transmission window material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide appropriate and excellent electromagnetic wave shield performance as an electromagnetic wave shield filter for plasma display panel, and at the same time to transmit light and obtain a clear image by forming at least one of two transparent substrates with tempered glass. SOLUTION: In an electromagnetic shield light transmission window material 1, two transparent substrates 2A and 2B are jointed and formed in one piece by a bonding layer 3 made of bonding resin such as ethylene-acetic vinyl copolymer where conductive particles are dispersed and mixed. As a material for composing the transparent substrates 2A and 2B, glass, polyethylenetelephtharate(PET), polycarbonate(PC), and polymethylmethaacrylate(PMMA) are used. In this case, at least one of the transparent substrates 2A and 2B should be made of tempered glass. Also, as glass for composing the transparent substrates 2A and 2B, chemically tempered glass is preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding light transmitting window material, and more particularly to an electromagnetic wave having good electromagnetic wave shielding and light transmitting properties, which is useful as a front filter of a plasma display panel (PDP). The present invention relates to a light transmitting window material having a shielding property.

[0002]

2. Description of the Related Art In recent years, with the spread of office automation equipment and communication equipment, electromagnetic waves generated from these equipment have become a problem. That is, there is a concern that the electromagnetic waves may affect the human body, and malfunctions of precision equipment due to the electromagnetic waves have become a problem.

In particular, in recent years, PDPs which have been commercialized as large flat displays have a large electromagnetic wave radiation from the screen due to the operation mechanism. Therefore, window materials having electromagnetic wave shielding properties and light transmission properties have been developed. , Has been put to practical use. Such a window material is also used as a window material in a place where precision equipment is installed, such as a hospital or a laboratory, in order to protect precision equipment from electromagnetic waves such as mobile phones.

The conventional electromagnetic wave shielding light transmitting window material has a structure in which a conductive mesh material such as a wire mesh is interposed between transparent substrates such as an acrylic plate.

[0005]

However, in the conventional electromagnetic wave shielding light transmitting window material using a conductive mesh, it is necessary to make the mesh of the mesh considerably fine in order to obtain a sufficient electromagnetic wave shielding property. , In that case, OA
Since a grid-like object is placed on the front of the PDP of the device, a phenomenon such as blurring of the image occurs, and a clear image cannot be obtained. Also, interference fringes (so-called moiré) occur between the number of dots of the PDP and the grid of the mesh,
This phenomenon also makes the image difficult to see.

In addition, when a conductive mesh is used, a thin mesh must be inserted between the substrates in the process of bonding the substrates, which makes the handling complicated.
It is also difficult to set bonding conditions and the like, and there is a problem that manufacturing is not easy.

As the transparent substrate of the electromagnetic wave shielding light transmitting window material, it is preferable to use a glass substrate because of its excellent rigidity, no deformation due to heat transfer from the PDP, and excellent corrosion resistance. The glass substrate described above has a large disadvantage in mechanical strength that it breaks when a strong load is applied. Further, it cannot be said that the chemical stability is sufficient, the weather resistance is insufficient, and the surface is burnt when exposed to a high-temperature and high-humidity environment for a long time.

[0008] The present invention solves the above-mentioned conventional problems and provides a PD.
It is an object of the present invention to provide an electromagnetic wave shielding light transmitting window material which has good electromagnetic wave shielding performance, is suitable as an electromagnetic wave shielding filter for P, and can obtain a transparent image with a clear image.

Another object of the present invention is to provide an electromagnetic wave shielding light transmitting window material having such excellent characteristics and easy to manufacture.

Another object of the present invention is to provide an electromagnetic wave shielding light transmitting window material in which the mechanical strength and chemical durability of a glass substrate as a transparent substrate are extremely good.

[0011]

According to a first aspect of the present invention, there is provided an electromagnetic wave shielding light transmitting window material in which two transparent substrates are joined and integrated by an adhesive layer made of a resin in which particles of a conductive material are dispersed and mixed. An electromagnetic wave shielding light transmitting window material,
At least one of the transparent substrates is made of tempered glass.

In the electromagnetic wave shielding light transmitting window material of the first aspect, particles of a conductive material (hereinafter referred to as “conductive particles”) are dispersed in an adhesive layer. By adjusting the amount of dispersion, it is possible to obtain a window material having a desired electromagnetic wave shielding performance and having a light transmissive property without a moire phenomenon.

Further, the electromagnetic wave shielding light transmitting window material according to the first aspect of the present invention is a resin sheet such as an ethylene-vinyl acetate copolymer (EVA) mixed with conductive particles to form a sheet for bonding two transparent sheets. By performing the bonding treatment by interposing between the substrates, it can be easily manufactured.

In claim 1, the particle size of the conductive particles in the adhesive layer is preferably 0.5 mm or less, and the mixing ratio thereof is preferably 0.1 to 50% by weight based on the resin.

[0015] The electromagnetic wave shielding light transmitting window material of the first aspect may use a conductive mesh together.

According to a fifth aspect of the present invention, there is provided an electromagnetic wave shielding light transmitting window material in which a conductive layer is adhered to a plate surface of a transparent substrate with a resin. Etched, wherein the transparent substrate is made of tempered glass.

According to a seventh aspect of the present invention, there is provided an electromagnetic wave shielding light transmitting window material in which a conductive layer is interposed between two transparent substrates and bonded with a resin. Is a pattern-etched foil of
At least one of the two transparent substrates is made of tempered glass.

According to the pattern etching, since the conductive foil can be etched into a desired pattern shape, the degree of freedom of the wire diameter, the interval, and the mesh shape is much larger than that of the conductive mesh. For this reason, it is possible to realize a good electromagnetic wave shielding light transmitting window material by using an etching foil that has both good electromagnetic wave shielding property and light transmittance and does not cause the moire phenomenon.

The conductive foil is preferably one obtained by etching a metal foil into a predetermined pattern by a process of coating a photoresist, exposing a pattern, and etching.

According to a ninth aspect of the present invention, there is provided an electromagnetic wave shielding light transmitting window material having a conductive layer formed on a plate surface of a transparent substrate, wherein the conductive layer is formed on the plate surface of the transparent substrate. The transparent substrate is made of tempered glass by pattern etching.

According to a tenth aspect of the present invention, there is provided an electromagnetic wave shielding light transmitting window material comprising two transparent substrates bonded and integrated with an adhesive resin, and a conductive layer formed on at least one of the transparent substrates. In the material, the conductive layer comprises:
The conductive film formed on the plate surface of the transparent substrate is pattern-etched, and the one and / or the other transparent substrate is made of tempered glass.

According to the pattern etching, since the conductive film can be etched into a desired pattern shape, the degree of freedom of the wire diameter, the interval, and the mesh shape is much larger than that of the conductive mesh. Therefore, it is possible to form an etching film that has both good electromagnetic wave shielding properties and light transmissivity and does not cause the moire phenomenon, thereby realizing a good electromagnetic wave shielding light transmissive window material.

Such an electromagnetic wave shielding light transmitting window material is formed by sheet molding an adhesive resin such as ethylene-vinyl acetate copolymer (EVA) using a transparent substrate on which a conductive film which has been subjected to pattern etching in advance is formed. The adhesive film is interposed between the two transparent substrates to perform the adhesive treatment, whereby the film can be easily manufactured.

The conductive film is preferably obtained by etching a metal film formed on a transparent substrate surface into a predetermined pattern by a process of coating a photoresist, exposing a pattern, and etching.

According to a twelfth aspect of the present invention, there is provided an electromagnetic wave shielding light transmitting window material having a conductive layer formed on a plate surface of a transparent substrate, wherein the conductive layer is electrically conductive on the plate surface of the transparent substrate. It is made by printing a pattern of water-based ink,
The transparent substrate is made of tempered glass.

According to a thirteenth aspect of the present invention, there is provided an electromagnetic wave shielding light transmitting window material in which two transparent substrates are bonded and integrated with an adhesive resin, and a conductive layer is formed on a plate surface of at least one of the transparent substrates. In the light transmitting window material, the conductive layer is obtained by pattern-printing a conductive ink on a plate surface of a transparent substrate, and the one and / or the other transparent substrate is made of tempered glass.

According to the pattern printing, since a conductive layer having a desired pattern shape can be formed, the degree of freedom of the wire diameter, the spacing, and the mesh shape is much larger than that of the conductive mesh. For this reason, it is possible to realize a good electromagnetic wave shielding light transmitting window material by using a pattern printing film that has both good electromagnetic wave shielding property and light transmittance and does not cause the moire phenomenon.

Such a window material is made of a transparent substrate on which a conductive layer has been formed by pattern printing in advance, and an adhesive film formed by sheet molding a resin such as ethylene-vinyl acetate copolymer (EVA) into two transparent substrates. By performing the bonding treatment with the interposition therebetween, it can be easily manufactured.

Moreover, in the present invention, since the tempered glass, preferably chemically strengthened glass, is used as the transparent substrate, the mechanical strength and the chemical stability of the transparent substrate are improved, and good weather resistance and durability can be obtained. .

In the present invention, the resin for bonding the transparent substrate is ethylene-vinyl acetate copolymer (EVA).
Is preferred.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electromagnetic wave shielding light transmitting window material of the present invention will be described below in detail with reference to the drawings.

First, an embodiment of the electromagnetic wave shielding light transmitting window material of claim 1 will be described in detail with reference to FIG.

FIG. 1 is a schematic sectional view showing an embodiment of an electromagnetic wave shielding light transmitting window material according to the present invention.

An electromagnetic wave shielding light transmitting window material 1 shown in FIG.
Is formed by joining and integrating two transparent substrates 2A and 2B with an adhesive layer 3 made of an adhesive resin such as EVA in which conductive particles are dispersed and mixed.

The constituent materials of the transparent substrates 2A and 2B include
Glass, polyester, polyethylene terephthalate (PET), polybutylene terephthalate, polymethyl methacrylate (PMMA), acrylic plate, polycarbonate (PC), polystyrene, triacetate sheet, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene, ethylene Vinyl acetate copolymer, polyvinyl butyral, metal ion crosslinked ethylene-methacrylic acid copolymer, polyurethane, cellophane, etc., preferably, glass, PET, PC, PMMA, etc., but in the present invention, the transparent substrate 2A, At least one of 2B is made of tempered glass.

In the present invention, the transparent substrate 2A and / or
Alternatively, as the glass constituting 2B, a chemically strengthened glass is preferably used.

As the chemically strengthened glass, for example, the following can be used.

A glass containing sodium ions as an alkali component is brought into contact with a molten salt containing potassium ions to form a compression layer on the glass surface by ion exchange between sodium ions and potassium ions. Glass in which lithium ions are fixed on the surface by contact with salt solution. Glass in which a glass containing sodium ions as an alkali component is immersed in a mixed molten salt composed of zinc nitrate and potassium nitrate to form an alkali elution preventing layer containing zinc ions on the glass surface. A glass in which a glass containing sodium ions as an alkali component is immersed in a mixed molten salt composed of calcium nitrate and potassium nitrate to form an alkali elution preventing layer containing an alkali component less than the inside of the glass on the glass surface. A glass in which a glass containing sodium ions as an alkali component is immersed in a mixed molten salt composed of lithium nitrate and potassium nitrate to form an alkali elution preventing layer containing lithium ions on the glass surface.

In the tempered glass of the above, after replacing sodium ions in the vicinity of the glass surface with potassium ions in a molten salt containing potassium ions, the molten salt is dissolved in an aqueous solution of lithium salt and further dissolved in another aqueous solution of lithium salt. The immersion greatly improves the chemical durability of the glass.
As the lithium salt to be used, lithium nitrate and lithium sulfate are preferably used, and among them, lithium nitrate is preferable. The concentration of lithium nitrate in the aqueous solution of lithium nitrate is 10 ^-4
Preferably, the concentration is at least 1 mol / l, and even if the concentration is at least 1 mol / l, the chemical durability does not increase with the concentration. Therefore, the concentration ranges from 10 ^-4 to 1 mol / l, especially 10 ^-2. It is preferably in the range of 1 to 1 mol / liter.

The glass surface chemically strengthened by the ion exchange reaction using a molten salt as described above has a very high activity. When the glass surface is touched with an aqueous solution, the ion exchange reaction between alkali metal ions and hydrogen ions is carried out. An amount of hydration layer forms on the glass surface and stabilizes the surface. When this stabilization is performed in an aqueous solution in which lithium ions are present, the lithium ions are fixed to the glass surface, and a layer having strong weather resistance is formed on the glass surface. This improves the mechanical strength of the glass, improves the chemical durability of the glass surface in a high-temperature, high-humidity atmosphere, and suppresses the occurrence of burns on the glass surface.

The tempered glass may be a mixed molten salt of zinc nitrate and potassium nitrate containing zinc nitrate in a molar concentration of 0.01 to 0.5%, or zinc nitrate in a molar concentration of 20%.
It is manufactured using a mixed molten salt composed of zinc nitrate and potassium nitrate containing up to 50%. When zinc nitrate is present alone, its decomposition temperature is 350 ° C., but when it is contained in potassium nitrate in an amount up to 0.5 mol% as an upper limit, it is stable even at a temperature higher than its decomposition temperature. Since it is present, the glass is immersed in a mixed molten salt at 330 ° C. to 450 ° C., whereby the stability of the molten salt can be ensured and the processing time can be shortened.

Also, zinc nitrate is used in a molar concentration of 20 to 50%.
When a mixed molten salt composed of zinc nitrate and potassium nitrate is used, the treatment can be performed at a low temperature near the eutectic point of the system of lithium nitrate and zinc nitrate. Strengthening treatment can be performed in a temperature range.

In this method, when a glass containing sodium ions as an alkali component is immersed in a molten mixed salt of potassium nitrate and zinc nitrate, the sodium ions in the glass and the zinc ions in the molten salt are replaced by ion exchange, A layer containing zinc is formed near the surface, and this layer improves mechanical strength and imparts high moisture resistance. In particular, in the case of a mixed salt containing zinc nitrate in an amount of 20 to 50 mol%, a layer containing zinc can be formed near the surface at a low temperature near the eutectic point. Is imparted.

The tempered glass is prepared by immersing glass containing sodium ions as an alkali component in a mixed molten salt of calcium nitrate and potassium nitrate containing calcium nitrate in a molar concentration of 10 to 40% to prevent alkali elution near the glass surface. Manufactured by forming layers.
Here, the temperature of the mixed molten salt is preferably from 350 to 470 ° C.

According to this method, a layer in which alkali is reduced from the inside of the glass is formed near the glass surface, and this layer improves mechanical strength and imparts high moisture resistance.

The tempered glass is prepared by immersing glass containing sodium ions as an alkali component in a mixed molten salt composed of lithium nitrate and potassium nitrate containing lithium nitrate in a molar concentration of 1 to 30%. It is produced by forming an alkali elution preventing layer containing Here, the temperature of the mixed molten salt is 3
The temperature is preferably from 30 to 450 ° C.

According to this method, the sodium ions in the glass and the lithium ions in the molten salt are replaced by ion exchange, and a layer containing lithium is formed near the surface. This layer improves the mechanical strength and improves the moisture resistance. Is given.

Prior to immersing the glass in the mixed molten salt, it is preferable to immerse the glass in a molten salt composed of only potassium nitrate to exchange potassium ions in the molten salt with sodium ions in the glass.

The thickness of the transparent substrates 2A and 2B is appropriately determined according to the required characteristics (for example, strength and lightness) depending on the application of the obtained window material, but is usually in the range of 0.1 to 5 mm. You.

The transparent substrates 2A and 2B do not necessarily need to be made of the same material. For example, when the front side only needs to be scratch-resistant or durable, as in the case of a PDP front filter, the transparent substrates 2A and 2B may be made of the same material. The transparent substrate 2A having a thickness of 1.0 to 4.
Transparent substrate 2B on the back side of a tempered glass plate of about 0 mm
Can be a PET plate or the like having a thickness of about 0.05 to 0.3 mm.

On the surface of the transparent substrate 2A on the front side, a single-layer film of the following (1) or a laminated film of a high-refractive-index transparent film and a low-refractive-index transparent film, for example, An antireflection film made of a laminated film having a laminated structure as in (5) may be formed.

(1) One layer of a transparent film having a lower refractive index than the transparent substrate (2) One layer of a high-refractive-index transparent film and one layer of a low-refractive-index transparent film (3) High A total of four alternately laminated two-layer transparent and low-refractive-index transparent films (4) One layer in the order of medium-refractive-index transparent film / high-refractive-index transparent film / low-refractive-index transparent film. Three layers laminated (5) High refractive index transparent film / Low refractive index transparent film In this order, three layers are alternately laminated, and a total of six layers are laminated. As the high refractive index transparent film, ITO (tin indium) is used. Oxide) or ZnO, Al-doped ZnO, TiO ₂ ,
A thin film having a refractive index of 1.8 or more, such as SnO ₂ or ZrO, preferably a transparent conductive thin film can be formed. Also,
As the low-refractive-index transparent film, a thin film made of a low-refractive-index material having a refractive index of 1.6 or less, such as SiO ₂ , MgF ₂ , or Al ₂ O _3, can be formed. These film thicknesses differ depending on the film configuration, film type, and center wavelength in order to reduce the reflectance in the visible light region due to light interference. However, in the case of a four-layer structure, the first layer on the transparent substrate side (high refractive index) 5 to 50 nm for the second layer (transparent film with low refractive index), 50 to 100 nm for the third layer (transparent film with high refractive index), and 50 for the fourth layer (transparent film with low refractive index). It is formed with a thickness of about 150 nm.

In the conventional electromagnetic wave shielding light transmitting window material,
There were drawbacks that the image was difficult to see due to the reflection of light on the screen, the viewing angle was small, and the screen contents could not be fully viewed for incident light from the side. By forming an anti-reflection film composed of a laminated film of a high-refractive-index transparent film and a low-refractive-index transparent film on the surface of the transparent substrate 2A to be formed, light reflection is prevented by the interference effect of light of the anti-reflection film. High viewing angle.

Further, an anti-contamination film may be further formed on such an anti-reflection film to increase the surface's anti-contamination resistance. In this case, as the contamination prevention film, a thin film having a thickness of about 1 to 1000 nm made of a fluorine-based thin film, a silicon-based thin film or the like is preferable.

In the electromagnetic wave shielding light transmitting window material of the present invention, the transparent substrate 2A on the front side is further subjected to a hard coat treatment with a silicon-based material or the like, or an antiglare in which a light scattering material is kneaded in the hard coat layer. Processing or the like may be performed. Further, the above-described anti-reflection film, hard coat film, anti-glare film, or the like can be attached to the transparent substrate 2A with a transparent adhesive or a transparent adhesive.

On the other hand, the transparent substrate 2B located on the back side, that is, on the side of the electromagnetic wave generation source, can be coated with a heat ray reflection coat such as a metal thin film or a transparent conductive film to enhance the functionality.

In this case, as the heat-reflective transparent conductive film formed on the transparent substrate 2B, ITO (tin indium oxide), ATO (tin antimony oxide), ZnO,
A thin film of Al-doped ZnO, SnO ₂ or the like can be formed. Also, a thin film of a metal thin film of gold, silver, copper, platinum or the like or an alloy thin film containing these elements has a visible light transmission property, and a heat ray reflective film that reflects infrared light may also be used. it can. The film thickness is
It depends on the required electromagnetic wave shielding, light transmission, and heat insulation properties.
The thickness is preferably about 5 to about 5 [mu] m, and in the case of a metal thin film, about 2 to 3000 degrees.

By stacking the transparent conductive oxide film and the metal thin film, the conductivity and the heat ray cutting property can be improved. If the number of layers is too large, the transparency in the visible light region is impaired. The preferred number of laminations is 1 to 20 layers each, 2 to 4 in total
One layer.

These oxide transparent conductive films and metal thin films are formed by sputtering, vacuum evaporation, ion plating,
It can be formed on a base transparent substrate by a sputtering method, preferably a film thickness control method such as a VD method.

In the conventional electromagnetic wave shielding light transmitting window material,
There was a problem that the screen was heated by the heat from the display. However, the heat from the display was reflected by forming a heat-ray reflective transparent conductive film on the surface of the transparent substrate 2B located on the side of the electromagnetic wave generation source. Thus, a good heat insulating effect can be obtained. In particular, in the case of a PDP, near-infrared rays are emitted in addition to visible light at the time of light emission, so that remote control of the PDP itself may not be possible. In addition, since there is a possibility of causing malfunction of surrounding home electric appliances, it is necessary to sufficiently cut off the light in the near infrared region.

The resin of the adhesive layer 3 for adhering the transparent substrates 2A and 2B includes ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-
(Meth) acrylic acid copolymer, ethylene-ethyl (meth) acrylate copolymer, ethylene-methyl (meth) acrylate copolymer, metal ion crosslinked ethylene- (meth) acrylic acid copolymer, partially saponified ethylene -Vinyl acetate copolymer, carboxylated ethylene-vinyl acetate copolymer,
Ethylene-based copolymers such as ethylene- (meth) acryl-maleic anhydride copolymer and ethylene-vinyl acetate- (meth) acrylate copolymer are mentioned (in addition,
“(Meth) acryl” indicates “acryl or methacryl”. ). In addition, polyvinyl butyral (PVB) resin, epoxy resin, acrylic resin, phenol resin, silicone resin, polyester resin, urethane resin, etc. can also be used, but the most balanced in terms of performance and the easy-to-use one is ethylene-vinyl acetate It is a copolymer (EVA). Further, PVB resins used in laminated glass for automobiles are also suitable in terms of impact resistance, penetration resistance, adhesiveness, transparency and the like.

The PVB resin contains 70 to 95% by weight of a polyvinyl acetal unit, 1 to 15% by weight of a polyvinyl acetate unit, and has an average degree of polymerization of 200 to 3000, preferably 3 to 5%.
It is preferably from 00 to 2500, and the PVB resin is used as a resin composition containing a plasticizer.

Examples of the plasticizer for the PVB resin composition include organic plasticizers such as monobasic acid esters and polybasic acid esters, and phosphoric acid plasticizers.

The monobasic acid esters include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptanoic acid, n-octylic acid, 2-ethylhexylic acid, pelargonic acid (n-
Esters obtained by the reaction of an organic acid such as nonylic acid) and decylic acid with triethylene glycol, and more preferably triethylene-di-2-ethylbutyrate and triethylene glycol-di-2-ethylhexo. Ethates, triethylene glycol-di-capronate, triethylene glycol-di-n-octoate and the like. Note that an ester of the above organic acid with tetraethylene glycol or tripropylene glycol can also be used.

The polybasic acid ester plasticizer is preferably, for example, an ester of an organic acid such as adipic acid, sebacic acid or azelaic acid and a linear or branched alcohol having 4 to 8 carbon atoms, more preferably. , Dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate and the like.

Examples of the phosphoric acid plasticizer include tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphate and the like.

In the PVB resin composition, if the amount of the plasticizer is small, the film-forming property is reduced, and if the amount is large, the durability and the like under heat resistance are impaired. 50 parts by weight, preferably 10-4
0 parts by weight.

The PVB resin composition may further contain additives such as a stabilizer, an antioxidant and an ultraviolet absorber for preventing deterioration.

Hereinafter, the adhesive layer according to the present invention will be described in more detail by exemplifying a case where EVA is used as the resin.

The EVA has a vinyl acetate content of 5 to 5
0% by weight, preferably 15-40% by weight is used. If the vinyl acetate content is less than 5% by weight, there is a problem in weather resistance and transparency, and if it exceeds 40% by weight, mechanical properties are remarkably deteriorated, film formation becomes difficult, and film mutual blocking occurs. .

When crosslinking by heating, an organic peroxide is suitable as the crosslinking agent, and is selected in consideration of sheet processing temperature, crosslinking temperature, storage stability and the like. Usable peroxides include, for example, 2,5-dimethylhexane-2,5-dihydroperoxide; 2,5-dimethyl-2,5-
Di (t-butylperoxy) hexane-3; di-t-butyl peroxide; t-butylcumyl peroxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane; dicumyl peroxide Α, α'-
Bis (t-butylperoxyisopropyl) benzene;
n-butyl-4,4-bis (t-butylperoxy) valerate; 2,2-bis (t-butylperoxy) butane; 1,1-bis (t-butylperoxy) cyclohexane; 1,1- Bis (t-butylperoxy) -3,
3,5-trimethylcyclohexane; t-butylperoxybenzoate; benzoyl peroxide; tert-butylperoxyacetate; 2,5-dimethyl-2,5
-Bis (tert-butylperoxy) hexyne-3; 1,1
-Bis (tert-butylperoxy) -3,3,5-trimethylcyclohexane; 1,1-bis (tert-butylperoxy) cyclohexane; methyl ethyl ketone peroxide; 2,5-dimethylhexyl-2,5-bisper Oxybenzoate; tertiary butyl hydroperoxide; p-menthane hydroperoxide; p-chlorobenzoyl peroxide; tertiary butyl peroxyisobutyrate; hydroxyheptyl peroxide; chlorohexanone peroxide. These peroxides are used alone or as a mixture of two or more, usually in a proportion of 10 parts by weight or less, preferably 0.1 to 10 parts by weight, based on 100 parts by weight of EVA.

The organic peroxide is usually extruded to EVA,
It is kneaded by a roll mill or the like, but may be dissolved in an organic solvent, a plasticizer, a vinyl monomer or the like, and added to the EVA film by an impregnation method.

In order to improve the physical properties (mechanical strength, optical properties, adhesion, weather resistance, whitening resistance, cross-linking speed, etc.) of EVA, various acryloxy or methacryloxy and allyl group-containing compounds are added. be able to. As the compound used for this purpose, acrylic acid or methacrylic acid derivatives, for example, esters and amides thereof are the most common, and ester residues include methyl, ethyl, dodecyl, stearyl, lauryl and other alkyl groups, as well as cyclohexyl groups. , A tetrahydrofurfuryl group, an aminoethyl group, a 2-hydroxyethyl group, a 3-hydroxypropyl group, and a 3-chloro-2-hydroxypropyl group. Further, esters with polyfunctional alcohols such as ethylene glycol, triethylene glycol, polyethylene glycol, trimethylolpropane, and pentaerythritol can also be used. As the amide, diacetone acrylamide is typical.

More specifically, polyfunctional esters such as acrylic or methacrylic esters such as trimethylolpropane, pentaerythritol and glycerin, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, diallyl isophthalate, and maleic Allyl group-containing compounds, such as diallyl acid, are listed. These may be used alone or as a mixture of two or more.
0.1 to 2 parts by weight, preferably 0.5 to 0 parts by weight
To 5 parts by weight.

When EVA is crosslinked by light, a photosensitizer is generally used in an amount of 10 parts by weight or less, preferably 0.1 to 10 parts by weight, per 100 parts by weight of EVA instead of the above-mentioned peroxide.

In this case, usable photosensitizers include
For example, benzoin, benzophenone, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, dibenzyl, 5-nitroacenaphthene, hexachlorocyclopentadiene, p-nitrodiphenyl, p-nitroaniline, 2,4,6-triene Nitroaniline, 1,2-benzanthraquinone, 3-methyl-1,3-diaza-
1,9-benzanthrone and the like;
Species can be used alone or in combination of two or more.

In this case, a silane coupling agent is used in combination as an accelerator. As the silane coupling agent, vinyltriethoxysilane, vinyltris (β
-Methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, γ-glycidoxypropyltrimethoxysilane, γ
-Glycidoxypropyltriethoxysilane, β-
(3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-chloropropylmethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N
-Β (aminoethyl) -γ-aminopropyltrimethoxysilane and the like.

These silane coupling agents are usually EV
One or more kinds are mixed and used at a ratio of 0.001 to 10 parts by weight, preferably 0.001 to 5 parts by weight with respect to 100 parts by weight of A.

The adhesive layer 3 according to claim 1 may contain a small amount of an ultraviolet absorber, an infrared absorber, an antioxidant, and a paint processing aid in addition to the conductive particles described below.
Colorants such as dyes and pigments, and fillers such as carbon black, hydrophobic silica and calcium carbonate may be blended in appropriate amounts to adjust the color of the filter itself.

In particular, by using a colored transparent resin obtained by adding a pigment to the above-mentioned colorless transparent resin as an adhesive resin, a natural display can be obtained by, for example, enhancing blue luminance. Alternatively, color purity can be improved and excellent color reproducibility can be obtained without using a color filter or the like.

That is, although the phosphor corresponding to each of the RGB colors is coated on each cell of the PDP, the luminous efficiency is not always the same. The chromaticity and color temperature are different depending on the type of the phosphor used. Complicated processing is required to adjust this to a predetermined design value.

In general, in the case of PDP, since blue light emission is weak, it is necessary to enhance blue luminance. Further, in order to improve color purity and obtain excellent color reproducibility, a separate color filter is required.

However, the effect of changing the color tone cannot be obtained with the electromagnetic wave shielding light transmitting window material joined and integrated by using a colorless and transparent adhesive resin.

On the other hand, by using a colored and transparent adhesive resin, the light transmittance is not impaired.
The blue luminance can be enhanced or the color purity can be improved, and a clear image can be obtained.

In this case, the pigment to be used is not particularly limited, and a general plastic coloring agent can be used. Examples thereof include yellow iron oxide, graphite, cadmium yellow, fast yellow, and disazo yellow. ,
Molybdate orange, pyrazolone orange, bengalara, cadmium red, lake red C, brilliant carmine 6B, quinacridone red, manganese violet, methyl violet lake, dioxazine violet, ultramarine, navy blue, cobalt blue, Victoria blue lake, phthalocyanine blue, chrome green , Chromium oxide, phthalocyanine green and the like can be used alone or in combination of two or more.

As described above, in the light emitting panel of the PDP, the blue light emission is weak, and it is desired to enhance the blue luminance. In order to improve the color purity, the present invention uses ultramarine, navy blue, cobalt blue, Victoria blue lake, One or more blue pigments such as phthalocyanine blue or a combination with a violet pigment such as manganese violet, methyl violet lake, dioxazine violet or the like is used to color blue. Alternatively, a pigment that improves the color purity of various RGB, a green pigment such as chrome green, chromium oxide, and phthalocyanine green, and a violet or blue pigment are mixed and blended.

It is preferable to employ such a method.

The amount of the pigment is selected from the group consisting of EVA to improve the characteristics such as contrast without impairing the transparency.
0.001 to 100 parts by weight of matrix resin such as
Preferably, the amount is from 10 to 10 parts by weight.

In the first aspect, the conductive particles dispersed in the adhesive layer 3 are not particularly limited as long as they have conductivity, and examples thereof include the following.

(I) Carbon particles or powder (ii) Nickel, indium, chromium, gold, vanadium, tin, cadmium, silver, platinum, aluminum, copper, titanium, cobalt, lead and other metals or alloys or their conductive properties Oxide particles or powder (iii) Plastic particles of polystyrene, polyethylene, etc. formed with a coating layer of the conductive material of (i) or (ii) above. The particle size of these conductive particles is excessively large. If it is large, it will affect the light transmittance and the thickness of the adhesive layer 3.
The following is preferred. The preferred particle size of the conductive particles is 0.01 to 0.5 mm.

When the mixing ratio of the conductive particles in the adhesive layer 3 is excessively large, the light transmittance is impaired, and when the mixing ratio is excessively small, the electromagnetic wave shielding property is insufficient. It is preferable that the weight ratio is about 0.1 to 50% by weight, particularly about 0.1 to 20% by weight, particularly about 0.5 to 20% by weight.

The color and gloss of the conductive particles are appropriately selected according to the purpose. In the case of a display filter, a dark and matte black or brown color is preferred. In this case, by adjusting the light transmittance of the filter appropriately by the conductive particles, there is also an effect that the screen becomes easy to see.

The electromagnetic wave shielding light transmitting window material of the present invention comprises:
A bonding sheet formed by mixing a predetermined amount of conductive particles and a crosslinking agent for heat or light curing into a resin such as EVA to form a sheet,
It can be easily manufactured by being interposed between the transparent substrates 2A and 2B, deaerated under reduced pressure and heating, pre-compressed, and then hardened and integrated with an adhesive layer by heating or light irradiation.

The bonding sheet may be a sheet to which means such as corona discharge treatment, low-temperature plasma treatment, electron beam irradiation, or ultraviolet light irradiation has been applied to the sheet surface as a means for improving the adhesiveness.

This adhesive sheet is prepared by mixing an adhesive resin and the above-mentioned additives, kneading the mixture with an extruder, a roll, or the like, and then forming the sheet into a predetermined shape by a film forming method such as calender, roll, T-die extrusion, or inflation. It is manufactured by molding. During film formation, embossing is applied to prevent blocking and facilitate degassing during pressure bonding with a transparent substrate.

The thickness of the adhesive layer 3 varies depending on the use of the electromagnetic wave shielding light transmitting window material and the like, but is usually about 0.05 to 1.0 mm. If the thickness of the adhesive layer 3 is less than 0.05 mm, the thickness of the conductive layer for electromagnetic wave shielding is too thin, and sufficient electromagnetic wave shielding properties cannot be obtained. May be damaged. Therefore, the adhesive sheet is formed to have a thickness of 0.05 to 1.0 mm so that an adhesive layer having such a thickness is obtained.

The electromagnetic wave shielding light transmitting window material of the first aspect eliminates the need for a conventional conductive mesh by mixing conductive particles into the adhesive layer and imparting electromagnetic wave shielding to the adhesive layer itself. However, the use of a conductive mesh is not excluded at all.

Further, in this case, the conductive mesh is designed to have a mesh design that does not impair the visibility due to the occurrence of a moire phenomenon or the like, and the lack of electromagnetic wave shielding performance due to the mesh is compensated for by the conductive particles. Electromagnetic wave shielding can be obtained.

In this case, the conductive mesh may be made of a metal such as stainless steel having a wire diameter of 10 to 500 μm, or a wire such as polyester or nylon provided with conductivity by plating, coating, impregnation or the like. Are preferably about 20 to 98%.

In the case where a conductive mesh is used in combination, for example, at least one of two sheets of conductive mesh mixed with conductive particles is used.
What is necessary is just to interpose the conductive mesh between the VA bonding sheets and bond and integrate them between the two transparent substrates, so that the manufacturing process becomes complicated by interposing the conductive mesh. There is no.

Next, an embodiment of an electromagnetic wave shielding light transmitting window material according to claims 5 and 7 will be described with reference to FIGS.

FIGS. 2 (a) and 2 (b) are schematic cross-sectional views showing an embodiment of the electromagnetic wave shielding light transmitting window material according to claims 5 and 7, and FIGS. It is a top view which shows the Example of an etching pattern.

In the electromagnetic wave shielding light transmitting window material 11 shown in FIG. 2A, two transparent substrates 12A and 12B are joined and integrated by adhesive layers 14A and 14B with a metal foil 13 interposed therebetween as a conductive foil. It becomes.

The electromagnetic wave shielding light transmitting window material 11 A shown in FIG. 2B is provided on one surface of one transparent substrate 12 with an adhesive layer 14.
And the metal foil 13 is bonded.

Regarding the constituent materials and the thicknesses of the transparent substrates 12A and 12B, the same materials as those described in the description of the electromagnetic wave shielding light transmitting window material of the above-mentioned claim 1 can be employed. The same configuration can be adopted in an antireflection film or a contamination prevention film for improving the functionality that can be formed on a substrate, and in various processes.

In the configuration shown in FIG.
As the transparent substrate, the same one as the transparent substrate 12A on the front side in FIG. 2A can be used.

The metal of the metal foil according to claims 5 and 7 is copper, stainless steel, aluminum, nickel, iron, brass, or an alloy thereof, preferably copper, stainless steel, or the like.
Aluminum is used.

If the thickness of the metal foil is too small, it is not preferable in terms of handleability and workability of pattern etching. If the thickness is too large, the thickness of the obtained electromagnetic wave shielding light transmitting window material is affected or the etching is not performed. It is preferable to set the thickness to about 1 to 200 μm because the time required for the process becomes long.

As a method for pattern-etching such a metal, any method generally used may be used, but photo-etching using a resist is preferable. In this case, after a photoresist is coated on the metal foil, pattern exposure is performed using a desired mask or the like, and development processing is performed to form a resist pattern. Thereafter, the portion of the metal foil where there is no resist may be removed with an etching solution such as a ferric chloride solution.

According to the pattern etching, the degree of freedom of the pattern is large, and the metal foil can be etched to an arbitrary wire diameter, an interval and a hole shape. Therefore, there is no moire phenomenon, and a desired electromagnetic wave shielding property and light transmission can be obtained. It is possible to easily form an electromagnetic wave shielding light transmitting window material having a property.

In the present invention, the shape of the etching pattern of the metal foil is not particularly limited.
3 (c), 3 (d), 3 (e), and 3 (c), grid-like metal foils 13A and 13B having square holes M as shown in FIG.
A metal foil 13C in the form of a punched metal having a circular, hexagonal, triangular or elliptical hole M as shown in FIG.
13D, 13E, and 13F. In addition to the holes M regularly arranged as described above, the moire phenomenon can be prevented as a random pattern.

In order to secure both the electromagnetic wave shielding property and the light transmittance, the area ratio of the opening portion on the projection surface of the metal foil (hereinafter referred to as “opening ratio”) may be 20 to 90%. preferable.

When the aperture ratio is increased in order to improve the light transmittance, a transparent conductive film is formed on the transparent substrate 12A or 12B or the transparent substrate 12 so that the insufficient shielding of the electromagnetic wave by the metal foil. May be supplemented.

Such a metal foil 13 is applied to the transparent substrate 12A,
The adhesive resin of the adhesive layers 14A, 14B, 14 to be adhered to the adhesive layers 12B, 12 is EVA exemplified as the adhesive resin used for the electromagnetic wave shielding light transmitting window material of claim 1 described above.
Or a PVB resin can be used (however, the blending of the conductive particles is not essential, but may be included), and the same method and conditions are adopted for the sheeting and bonding methods and conditions. be able to.

The electromagnetic wave shielding light transmitting window material 11 shown in FIG. 2A is made of two sheets of adhesive film formed by mixing a crosslinker for heat or light curing with an ethylene copolymer such as EVA. Sandwiching the metal foil 13 with the pattern etching between them,
This is interposed between the transparent substrates 12A and 12B, degassed under reduced pressure and heating, pre-compressed, and then cured or integrated by heating or light irradiation to integrate the adhesive layer. .

Further, the electromagnetic wave shielding light transmitting window material 11A of FIG. 2B is obtained by laminating a transparent substrate 12, the above-mentioned bonding film and the metal foil 13 subjected to pattern etching, and cured in the same manner as described above. It can be easily manufactured by being integrated.

The thickness of the adhesive layers 14A, 14B, 14 varies depending on the use of the electromagnetic wave shielding light transmitting window material, but is usually about 0.05 to 1.0 mm. Therefore, the adhesive film is formed to have a thickness of 0.05 to 1.0 mm so that an adhesive layer having such a thickness is obtained.

Next, referring to FIGS.
An embodiment of the electromagnetic wave shielding light transmitting window material will be described.

FIG. 4 is a schematic sectional view showing an embodiment of the electromagnetic wave shielding light transmitting window material according to the ninth and tenth aspects.
5A to 5F are plan views showing an example of the etching pattern.

Electromagnetic wave shielding light transmitting window material 21 shown in FIG.
Is formed by bonding and integrating two transparent substrates 22A and 22B with an adhesive layer 24.
A, 22B is provided with a metal film 23 which is pattern-etched on the side of the adhesive layer 24 of the transparent substrate 22A.

Regarding the constituent materials and the thicknesses of the transparent substrates 12A and 12B, the same materials as those described in the above description of the electromagnetic wave shielding light transmitting window material of claim 1 can be employed. The same configuration can be adopted in an antireflection film or a contamination prevention film for improving the functionality that can be formed on a substrate, and in various processes.

As the metal of the metal film according to the ninth and tenth aspects, copper, stainless steel, chromium, aluminum, nickel, iron, brass, or an alloy thereof, preferably copper, stainless steel, aluminum, or chromium is used.

As a method for forming such a metal film on a transparent substrate, methods such as electroless plating, vacuum deposition, sputtering, and chemical vapor deposition can be employed.

If the thickness of the metal film is too small, the electromagnetic wave shielding property is insufficient, so that it is not preferable. If the thickness is too large, the thickness of the obtained electromagnetic wave shielding light transmitting window material is affected, or the time required for the etching step is reduced. Because it becomes long,
The thickness is preferably about 0.01 to 50 μm.

As a method of pattern-etching such a metal film, any method generally used may be used, but photo-etching using a resist is preferable. In this case, after a photoresist is coated on the metal film, pattern exposure is performed using a desired mask or the like, and development processing is performed to form a resist pattern. Thereafter, the portion of the metal film where there is no resist may be removed with an etching solution such as a ferrous chloride solution.

According to the pattern etching, the degree of freedom of the pattern is large, and the metal film can be etched to an arbitrary wire diameter, interval and hole shape. Therefore, there is no moire phenomenon, and the desired electromagnetic wave shielding property and light transmission can be obtained. It is possible to easily form an electromagnetic wave shielding light transmitting window material having a property.

In the ninth and tenth aspects, the shape of the etching pattern of the metal film is not particularly limited.
(A), (b), grid-like metal films 23A and 23B in which square holes M are formed, as shown in FIGS.
(E), a metal film 23C, 23D, 23E, 23F in the form of a punched metal in which a circular, hexagonal, triangular or elliptical hole M as shown in FIG. In addition to the holes M regularly arranged as described above, the moire phenomenon can be prevented as a random pattern.

In order to secure both the electromagnetic wave shielding property and the light transmittance, the area ratio of the opening portion on the projection surface of the metal film (hereinafter, referred to as “opening ratio”) may be 20 to 90%. preferable.

When the aperture ratio is increased to improve the light transmittance, the above-mentioned transparent conductive film is formed on the transparent substrate 22A or 22B or the transparent substrate 22, and the electromagnetic wave shielding property of the metal film is reduced. The shortfall may be compensated for.

In FIG. 4, the metal film 23 is formed on the back surface of the transparent substrate 22A.
May be formed on the adhesive layer 24 side or the surface side opposite to the adhesive layer 24, or may be formed on two or more of these.

The transparent substrate 22 according to claim 9,
As the adhesive resin of the adhesive layer 24 for bonding A and 22B,
EVA, PVB resin, etc. exemplified as the adhesive resin used for the electromagnetic wave shielding light transmitting window material of claim 1 described above can be used (however, the blending of the conductive particles is not essential, but may be included). The same method and conditions can be adopted for the method and conditions for forming the sheet and bonding.

The electromagnetic wave shielding light transmitting window material 21 shown in FIG.
Is an EVA between the transparent substrate 22A and the transparent substrate 22B on which the pattern-etched metal film 23 is formed.
A crosslinker for heat or light curing is mixed with an ethylene-based copolymer, etc., and an adhesive film formed into a sheet is interposed, degassed under reduced pressure and warming, pre-pressed, and then heated or irradiated with light. The adhesive layer can be easily manufactured by curing and integrating the adhesive layer.

The thickness of the adhesive layer 23 depends on the application of the electromagnetic wave shielding light transmitting window material and the like, but is usually about 0.05 to 1.0 mm. Therefore, the adhesive film is formed to have a thickness of 0.05 to 1.0 mm so that an adhesive layer having such a thickness is obtained.

Next, referring to FIGS.
An embodiment of the electromagnetic wave shielding light transmitting window material will be described.

FIG. 6 is a schematic sectional view showing an embodiment of the electromagnetic wave shielding light transmitting window material according to the twelfth and thirteenth aspects, and FIGS. 7A to 7F show examples of the printing pattern. It is a top view.

The electromagnetic wave shielding light transmitting window material 31 shown in FIG.
Is formed by bonding and integrating two transparent substrates 32A and 32B with an adhesive layer 34. The two transparent substrates 32A and 32B
In 2B, a conductive layer 33 is formed on the adhesive layer 34 side of the transparent substrate 32A by pattern printing.

Regarding the constituent materials and the thicknesses of the transparent substrates 32A and 32B, the same materials as those described in the description of the electromagnetic wave shielding light transmitting window material of claim 1 can be employed. The same configuration can be adopted in an antireflection film or a contamination prevention film for improving the functionality that can be formed on a substrate, and in various processes.

In order to form a conductive layer on the plate surface of the transparent substrate, the following conductive ink is used to print on the plate surface of the transparent substrate by a screen printing method, an ink jet printing method, an electrostatic printing method, or the like. good.

50 to 90% by weight of a conductive material particle such as a carbon black particle having a particle diameter of 100 μm or less, or a metal or alloy particle such as copper, aluminum and nickel.
It is dispersed in a binder resin such as PMMA, polyvinyl acetate, epoxy resin or the like. This ink is diluted or dispersed in an appropriate concentration in a solvent such as toluene, xylene, methylene chloride, or water, and applied by printing on the plate surface of a transparent substrate, and then dried at room temperature to 120 ° C. as necessary, and then dried on the substrate. Apply. Particles obtained by covering particles of the same conductive material as described above with a binder resin are directly applied by electrostatic printing and fixed by heat or the like.

The thickness of the printed film formed in this manner is not preferable because the electromagnetic wave shielding performance is insufficient if the thickness is too small, and the thickness of the electromagnetic wave shielding light transmitting window material obtained when the thickness is too large is unfavorable. From 0.5 to 100μ
m is preferable.

According to such pattern printing, the degree of freedom of the pattern is large, and a conductive layer having an arbitrary wire diameter, interval and opening shape can be formed. Therefore, there is no moire phenomenon and a desired electromagnetic shielding property can be obtained. In addition, an electromagnetic wave shielding light transmitting window material having a light transmitting property can be easily formed.

In the present invention, the shape of the pattern printing of the conductive layer is not particularly limited. For example, a grid-like printing film 33A having a rectangular opening M as shown in FIGS. 7A and 7B is formed. , 33B, FIGS. 7 (c), (d), (e),
(F) A punched metal-like printed film 33 in which a circular, hexagonal, triangular or elliptical opening M is formed as shown in FIG.
C, 3D, 33E, 33F and the like. In addition to the regular arrangement of the openings M, the moire phenomenon can be prevented as a random pattern.

In order to secure both the electromagnetic wave shielding property and the light transmitting property, the area ratio of the opening on the projection surface of the printing film (hereinafter, referred to as “opening ratio”) may be 20 to 90%. preferable.

When the aperture ratio is increased in order to improve the light transmittance, the above-mentioned transparent conductive film is formed on the transparent substrate 32A or 32B or the transparent substrate 32, and the electromagnetic wave shielding by the printed film is performed. You may make up for the lack of sex.

The transparent substrate 32 according to claim 12 or 13,
As the adhesive resin of the adhesive layer 34 for bonding A and 32B,
EVA, PVB resin, etc. exemplified as the adhesive resin used for the electromagnetic wave shielding light transmitting window material of claim 1 described above can be used (however, the blending of the conductive particles is not essential, but may be included). The same method and conditions can be adopted for the method and conditions for forming the sheet and bonding.

The electromagnetic wave shielding light transmitting window material 31 shown in FIG.
Is a method in which a transparent substrate 32A in which a conductive layer 33 is previously formed by pattern printing is used, and an adhesive film in which an ethylene copolymer such as EVA is mixed with a crosslinking agent for heat or light curing to form a sheet is used as the transparent substrate 32A. , 32B, deaerated under reduced pressure and heating, and pre-compressed, and then the adhesive layer is hardened by heating or light irradiation to be integrated to easily manufacture.

The thickness of the adhesive layer 34 varies depending on the use of the electromagnetic wave shielding light transmitting window material and the like, but is usually about 0.05 to 1.0 mm. Therefore, the adhesive film is formed to have a thickness of 0.05 to 1.0 mm so that an adhesive layer having such a thickness is obtained.

The electromagnetic wave shielding light transmitting window material of the present invention can be effectively used as a front filter of a PDP or a window material of a place where precision equipment is installed in a hospital or a laboratory.

[0149]

The present invention will be described more specifically below with reference to examples and comparative examples.

The bonding sheet and the tempered glass plate used in the examples and comparative examples were manufactured as follows.

[Production of Adhesive Sheet] To 100 parts by weight of ethylene-vinyl acetate copolymer (Ultracene 634, manufactured by Toyo Soda Co., Ltd .: vinyl acetate content: 26%, melt index: 4) was added 1,1-bis (t-butyl par. Oxy) -3,
1 part by weight of 3,5-trimethylcyclohexane (Perhexa 3M manufactured by NOF Corporation), 0.1 part by weight of γ-methacryloxypropyltrimethoxysilane, diallyl phthalate 2
Parts by weight, and 0.5 parts by weight of Sumisolve 130 (manufactured by Sumitomo Chemical Co., Ltd.) as an ultraviolet absorber, and conductive particles shown in Table 1 were added and mixed in the ratio shown in Table 1 (however, Comparative Example 1
And no conductive particles were added in Examples 3 to 3).
A double-sided embossed adhesive sheet having a thickness of 1 mm or 0.2 mm was prepared.

[Tempered glass plate] Zinc nitrate concentration is 0.5%
Zinc nitrate hexahydrate Zn (NO ₃ ) 2.6H ₂
Put O and potassium nitrate KNO ₃ in a stainless steel container,
It was heated to 60 ° C. to form a molten salt. Vertical 1000mm, horizontal 6
A float glass having a composition of soda lime silica having a thickness of 00 mm and a thickness of 3 mm was immersed in the molten salt for 1 hour and then cooled to obtain a chemically strengthened glass plate.

<Examples and Comparative Examples of Electromagnetic Wave Shielding Light Transmitting Window Material of Claim 1> Examples 1 to 4 and Comparative Examples 1 to 3 A reinforced glass plate having a thickness of 3.0 mm was used as the front transparent substrate 2A. A 0.1 mm thick PET sheet is used as the back transparent substrate 2B, and an adhesive sheet (0.1 mm thick) is interposed between the PET sheets and placed in a rubber bag and vacuum degassed. Preheating was performed by heating at a temperature of 150C for 15 minutes.
Thereafter, the pre-pressed body is placed in an oven,
Was heat-treated for 15 minutes under the conditions described above, and crosslinked and cured to integrate.

In Comparative Examples 2 and 3 and Examples 3 and 4, the conductive mesh shown in Table 1 was bonded and integrated with a transparent substrate interposed therebetween.

The obtained window material was treated with 3
The electromagnetic wave shielding property, light transmittance, and visibility (presence or absence of a moire phenomenon) at 0 MHz to 300 MHz were examined. The results are shown in Table 1.

[Electromagnetic Wave Shielding Property] An electric field attenuation measurement was performed using an EMI shield measuring device (MA8602B) manufactured by Anritsu Corporation in accordance with the KEC method (Kansai Electronic Industry Development Center). Sample size is 90mm x 110mm
Met.

[Light transmittance (%)] 380 nm to 780 using a visible ultraviolet spectrometer (U-4000) manufactured by Hitachi.
The average visible light transmittance between nm was determined.

[Visibility] The display was set on a display, and it was visually observed whether or not an interference fringe pattern was generated on the screen.

[0159]

[Table 1]

Table 1 shows that claim 1 provides a good electromagnetic wave shielding light transmitting window material.

<Examples and Comparative Examples of Electromagnetic Wave Shielding Light Transmitting Window Material of Claim 7> Examples 5 and 6 A tempered glass plate having a thickness of 3.0 mm was used as the front side transparent substrate 12A, and the back side transparent substrate 12B was used. 0.1m thick
m, between which a metal foil shown in Table 2 is sandwiched between two adhesive films (thickness: 0.2 mm) and put in a rubber bag. It was degassed under vacuum, and heated at a temperature of 85 ° C. for 15 minutes for pre-compression bonding. Thereafter, the pre-pressed body was placed in an oven, and heat-treated at 150 ° C. for 15 minutes, crosslinked and hardened, and integrated.

The obtained window material was examined in the same manner as in Example 1 for electromagnetic wave shielding properties, light transmittance and visibility (whether or not there was a moire phenomenon) at 30 MHz to 300 MHz, and the results are shown in Table 2.

Comparative Examples 4 to 6 In Example 5, an electromagnetic wave shielding property was obtained in the same manner as in Example 5, except that a metal foil subjected to pattern etching was not used, or a metal mesh shown in Table 3 was used instead of the metal foil. A light-transmitting window material was prepared, and its characteristics were similarly examined. The results are shown in Table 3.

[0164]

[Table 2]

[0165]

[Table 3]

Tables 2 and 3 show that claim 7 provides a good electromagnetic wave shielding light transmitting window material.

<Examples and Comparative Examples of Electromagnetic Shielding Light Transmitting Window Material of Claim 10> Examples 7 and 8 A tempered glass plate having a thickness of 3.0 mm was prepared as the front transparent substrate 22A. After forming a metal film of a metal shown in Table 4 to a thickness shown in Table 4 on one surface, pattern etching was performed in a pattern shown in Table 4. Also, a PET sheet having a thickness of 0.1 mm is used as the back side transparent substrate 22B, an adhesive film (thickness 0.2 mm) is interposed between the transparent substrates 22A and 22B, and this is put in a rubber bag. It was degassed under vacuum, and heated at a temperature of 85 ° C. for 15 minutes for pre-compression bonding. After that, put this pre-pressed body in the oven,
Heat treatment was performed at 150 ° C. for 15 minutes, followed by cross-linking and curing to integrate.

With respect to the obtained window material, the electromagnetic wave shielding property, light transmittance and visibility (presence or absence of a moire phenomenon) at 30 MHz to 300 MHz were examined in the same manner as in Example 1.
The results are shown in Table 4.

Comparative Example 7 A light-transmitting window material was produced in the same manner as in Example 7 except that the transparent substrate 22A was joined and integrated without forming a metal film, and its characteristics were similarly examined. 5 is shown.

Comparative Examples 8 and 9 The same procedure as in Example 7 was carried out except that the metal film was not formed on the transparent substrate 22A and the copper wire mesh shown in Table 5 was interposed between the two transparent substrates and joined together. Thus, an electromagnetic wave shielding light transmitting window material was produced, and its characteristics were similarly examined. The results are shown in Table 5.

[0171]

[Table 4]

[0172]

[Table 5]

Tables 4 and 5 show that claim 9 provides a good electromagnetic wave shielding light transmitting window material.

<Examples and Comparative Examples of Electromagnetic Shielding Light Transmitting Window Material of Claim 13> Examples 9 and 10 A tempered glass plate having a thickness of 3.0 mm was used as the front transparent substrate 32A, and the rear transparent substrate 32B was used. 0.1m thick
The conductive layer 33 was formed by pattern printing on one plate surface of the transparent substrate 32A using the conductive ink shown in Table 6 in a shape shown in Table 6 using a PET sheet of m. One having an adhesive film interposed between these transparent substrates 32A and 32B was put in a rubber bag, degassed under vacuum, heated at a temperature of 85 ° C. for 15 minutes, and pre-compressed. Thereafter, the pre-pressed body was placed in an oven, and heat-treated at 150 ° C. for 15 minutes, crosslinked and hardened, and integrated.

With respect to the obtained window material, the electromagnetic wave shielding property, the light transmittance and the visibility (the presence or absence of the moire phenomenon) at 30 MHz to 300 MHz were examined in the same manner as in Example 1. The results are shown in Table 6.

Comparative Example 10 A light-transmitting window material was produced in the same manner as in Example 9 except that the transparent substrate 32A was joined and integrated without performing pattern printing, and the characteristics were similarly examined. 7 is shown.

Comparative Examples 11 and 12 The same procedure as in Example 9 was carried out except that the transparent substrate 32A and the conductive mesh shown in Table 7 were interposed between the transparent substrates 32A and 32B without pattern printing. Thus, an electromagnetic wave shielding light transmitting window material was produced, and its characteristics were similarly examined. The results are shown in Table 7.

[0178]

[Table 6]

[0179]

[Table 7]

Tables 6 and 7 show that claim 13 provides a good electromagnetic wave shielding light transmitting window material.

Example 11 and Comparative Example 13 A mechanical strength test was performed using ordinary float glass and the above-mentioned chemically strengthened glass. In the structure of FIG. 1, the transparent substrate 2A is a float glass plate having a thickness of 2 mm, the transparent substrate 2B.
Was subjected to a three-point bending test using a compression tester manufactured by Instron as a float glass plate or a chemically strengthened glass plate having a thickness of 1 mm. The sample shape and test conditions are shown below.
Table 8 shows the test results. Sample shape: 50 mm x 150 mm 3-point bending span: 80 mm Crosshead speed: 2 mm / min Number of samples: Average value of n = 5

[0182]

[Table 8]

Table 8 shows that the use of chemically strengthened glass can improve the breaking stress.

[0184]

As described above in detail, the electromagnetic wave shielding light transmitting window material of claim 1 can be obtained by adjusting the particle size and the dispersion amount of the conductive particles.
Desired electromagnetic wave shielding properties and light transmittance can be obtained. A clear image can be obtained by preventing the moire phenomenon and the like when using a conductive mesh. It can be easily manufactured by a normal bonding process.

Excellent effects such as

The electromagnetic wave shielding light transmitting window material according to claims 5 and 7 can obtain desired electromagnetic wave shielding characteristics and light transmission by selecting the shape of the pattern etching of the conductive foil. A clear image can be obtained by preventing the moire phenomenon and the like when using a conductive mesh.

Excellent effects such as

According to the ninth and tenth aspect of the present invention, desired electromagnetic shielding properties and light transmittance can be obtained by selecting the shape of the pattern etching of the conductive film. A clear image can be obtained by preventing the moire phenomenon and the like when using a conductive mesh. By forming a conductive film that has been pattern-etched on a transparent substrate in advance, it can be easily manufactured by a normal bonding process.

Excellent effects are obtained.

The electromagnetic wave shielding light transmitting window material of the twelfth and thirteenth aspects can obtain desired electromagnetic wave sealing properties and light transmittance by selecting the shape of the pattern printing of the conductive layer. A clear image can be obtained by preventing the moire phenomenon and the like when using a conductive mesh. By forming a conductive layer on the plate surface of the transparent substrate in advance by pattern printing, it can be easily manufactured by a normal bonding process.

Excellent effects such as

In addition, the electromagnetic wave shielding light transmitting window material of the present invention has a high mechanical strength of the transparent substrate and a high chemical stability, so that high strength and good weather resistance and durability can be obtained.

Therefore, the electromagnetic wave shielding light transmitting window material of the present invention is extremely useful industrially as an electromagnetic wave shielding filter for PDP and the like.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an electromagnetic wave shielding light transmitting window material according to claim 1;

FIG. 2 is a schematic sectional view showing an embodiment of an electromagnetic wave shielding light transmitting window material according to claims 5 and 7;

FIG. 3 is a plan view showing an example of an etching pattern.

FIG. 4 is a schematic cross-sectional view showing an embodiment of an electromagnetic wave shielding light transmitting window material according to claims 9 and 10;

FIG. 5 is a plan view showing an example of an etching pattern.

FIG. 6 is a schematic sectional view showing an embodiment of an electromagnetic wave shielding light transmitting window material according to claims 12 and 13;

FIG. 7 is a plan view showing an example of a print pattern.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electromagnetic wave shielding light transmitting window material 2A, 2B Transparent substrate 3 Adhesive layer 11, 11A Electromagnetic wave shielding light transmitting window material 12, 12A, 12B Transparent substrate 13, 13A, 13B, 13C, 13D, 13E, 13
F Metal foil 14, 14A, 14B Adhesive layer 21 Electromagnetic wave shielding light transmitting window material 22A, 22B Transparent substrate 23 Metal film 24 Adhesive layer 31 Electromagnetic wave shielding light transmitting window material 32A, 32B Transparent substrate 33 Conductive layer 33A, 33B, 33C , 33D, 33E, 33F Printing film 34 Adhesive layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) G12B 17/02 G12B 17/02 (72) Inventor Yasuhiro Morimura 3-1-1 Ogawa Higashicho, Kodaira City, Tokyo F term in Bridgestone Technology Center (reference) 2F078 HA13 5E321 BB23 BB25 BB41 GG05 GH01

Claims (15)

[Claims] 1. An electromagnetic wave shielding light transmitting window material formed by joining and integrating two transparent substrates with an adhesive layer made of a resin in which particles of a conductive material are dispersed and mixed, wherein the two transparent substrates are At least one of them is made of tempered glass. 2. The electromagnetic wave shielding light transmitting window material according to claim 1, wherein the mixing ratio of the conductive material particles in the adhesive layer is 0.1 to 50% by weight based on the resin. 3. The electromagnetic wave shielding light transmitting window material according to claim 1, wherein the particle size of the conductive material particles is 0.5 mm or less. 4. The electromagnetic wave shielding light transmitting window material according to claim 1, wherein a conductive mesh is interposed between the two transparent substrates. 5. An electromagnetic wave shielding light transmitting window material in which a conductive layer is adhered to a plate surface of a transparent substrate with a resin, wherein the conductive layer is obtained by pattern-etching a conductive foil, and the transparent substrate is reinforced. An electromagnetic wave shielding light transmitting window material made of glass. 6. The electromagnetic wave shielding light transmitting window material according to claim 5, wherein the conductive layer is provided along one surface of one transparent substrate. 7. An electromagnetic wave shielding light transmitting window material in which a conductive layer is interposed between two transparent substrates and bonded with a resin, wherein the conductive layer is obtained by pattern-etching a conductive foil. An electromagnetic shielding light transmitting window material, wherein at least one of the two transparent substrates is made of tempered glass. 8. The method according to claim 5, wherein the foil is a metal foil, and is etched into a predetermined pattern by a process of coating a photoresist, exposing a pattern, and etching. Electromagnetic wave shielding light transmitting window material. 9. An electromagnetic wave shielding light transmitting window material having a conductive layer formed on a plate surface of a transparent substrate, wherein the conductive layer is obtained by pattern-etching a conductive film formed on the plate surface of the transparent substrate. Wherein the transparent substrate is made of tempered glass. 10. An electromagnetic wave shielding light transmitting window material in which two transparent substrates are joined and integrated with an adhesive resin, and a conductive layer is formed on at least one of the transparent substrates. A conductive film formed on a plate surface is subjected to pattern etching, and said one and / or the other transparent substrate is made of tempered glass. 11. The electromagnetic wave according to claim 9, wherein the conductive film is a metal film, and is etched into a predetermined pattern by a process of coating a photoresist, pattern exposure, and etching. Shielding light transmission window material. 12. An electromagnetic wave shielding light transmitting window material having a conductive layer formed on a plate surface of a transparent substrate, wherein the conductive layer is formed by pattern-printing a conductive ink on the plate surface of the transparent substrate. An electromagnetic wave shielding light transmitting window material, wherein the transparent substrate is made of tempered glass. 13. An electromagnetic wave shielding light transmitting window material comprising two transparent substrates joined and integrated by an adhesive resin, and a conductive layer formed on a plate surface of at least one of the transparent substrates. An electromagnetic wave shielding light transmitting window material, wherein a conductive ink is pattern-printed on a plate surface of a transparent substrate, and the one and / or the other transparent substrate is made of tempered glass. 14. The method according to claim 1, wherein the first, second, third, fourth, fifth, sixth, seventh, eighth, tenth, and eleventh parts are provided.
3. The electromagnetic wave shielding light transmitting window material according to claim 3, wherein the resin is an ethylene-vinyl acetate copolymer. 15. The electromagnetic wave shielding light transmitting window material according to claim 1, wherein the tempered glass is chemically strengthened glass.