JP2002293583A - Intermediate film for laminated glass and laminated glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intermediate film for laminated glass and laminated glass using the intermediated film which are excellent in transparency, a heat shielding property, and electromagnetic wave transmittance. SOLUTION: The intermediate film is composed of a polyvinylbutyral resin, plasticizer, and a tin doped indium oxide(ITO) particle and/or an antimony doped indium oxide(ATO) particle of 0.1-3 wt.pt., the mean particle diameter of a tin doped indium oxide(ITO) particle or an antimony doped indium oxide(ATO) particle is <=80 nm, and dispersed such that the numbers of particles having >=100 nm particle diameter are <=1/μm<2> . The laminated glass using the film has the electromagnetic wave shielding property for 1-10 MHz or 2-26.5 GHz is <=10 dB.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to transparency, heat shielding,
The present invention relates to an interlayer film for laminated glass having excellent electromagnetic wave transmittance and a laminated glass using the same.

[0002]

2. Description of the Related Art Conventionally, laminated glass is safe even when broken by an external impact, since glass fragments are not scattered. Therefore, window glass for vehicles such as automobiles, aircraft, buildings, and the like. Widely used as etc. As the laminated glass, an intermediate film for laminated glass made of a polyvinyl acetal resin such as a polyvinyl butyral resin plasticized by a plasticizer is interposed between at least a pair of glasses, and a glass obtained by integration is used. I have.

[0003] However, although such laminated glass is excellent in safety, it has a problem that it is inferior in heat insulation. In general, among light rays, infrared light having a wavelength of 780 nm or more has a small energy amount of about 10% as compared with ultraviolet light, but has a large thermal effect, and is emitted as heat absorbed by a substance to cause a temperature rise. , Is called a hot wire. Therefore, by blocking the infrared rays entering from the windshield and the side glass, and suppressing the temperature rise of the vehicle, the heat shielding property can be enhanced. As such a glass plate, for example, a heat ray cut glass is commercially available.

[0004] The above-mentioned heat ray cut glass is obtained by applying a metal / metal oxide multilayer coating to the surface of a glass plate by metal deposition, sputtering or the like for the purpose of blocking direct sunlight. Vulnerable to external abrasion and poor chemical resistance, for example,
A method of laminating an intermediate film such as a plasticized polyvinyl butyral resin film to form a laminated glass has been adopted.

[0005] However, the heat ray cut glass in which the intermediate film such as the plasticized polyvinyl butyral resin film is laminated is expensive, and the transparency (visible light transmittance) is reduced due to the thick multilayer coating. There were problems such as the adhesiveness with the film being reduced, the interlayer film being peeled off and whitened, and the transmission of electromagnetic waves being hindered, which hindered the communication functions of mobile phones, car navigation systems, garage openers, automatic fee collection systems, etc. .

As a solution to such a problem, for example, a laminated glass in which a metallized polyester film is laminated between plasticized polyvinyl butyral resin sheets has been proposed (Japanese Patent Publication No. Sho 61-52093,
JP-A-64-36442 public law, etc.). However, the laminated glass disclosed above has a problem in adhesion between the plasticized polyvinyl butyral resin sheet and the polyester film, and not only peeling occurs at the interface but also a problem such as insufficient electromagnetic wave transmission. there were.

[0007]

Further, the heat ray reflective glass or heat ray reflective laminated glass using heat ray reflective polyethylene terephthalate (PET) which has been conventionally used has problems in workability, workability, productivity, etc. In addition, there is a problem in that communication functions of a mobile phone, a car navigator, a garage opener, an automatic toll collection system, and the like are hindered to shield electromagnetic waves.

However, in the heat ray shielding laminated glass of the present invention, since the intermediate film has a heat ray shielding function,
The conventional heat ray shielding that can perform the workability, workability, and productivity at the time of laminated glass in the same way as ordinary laminated glass, and has no electromagnetic interference so that it does not hinder the communication function at all. An object of the present invention is to provide a novel heat-shielding laminated glass interlayer and a laminated glass which are different from the laminated glass.

The present invention has been made in view of the above-mentioned drawbacks, and has as its object to provide an interlayer film for laminated glass which has excellent transparency and heat shielding properties and good electromagnetic wave transmittance, and a method for using the interlayer film. It is to provide a laminated glass.

[0010]

The interlayer film for laminated glass according to claim 1 is an interlayer film for laminated glass comprising a plasticized polyvinyl butyral resin, wherein the plasticized polyvinyl butyral resin is a polyvinyl butyral resin.
0 parts by weight, 30 to 60 parts by weight of a plasticizer, and 0.1 to 3 parts by weight of fine particles of tin-doped indium oxide (ITO) and / or fine particles of antimony-doped indium oxide (ATO). (IT
O) fine particles or antimony-doped indium oxide (AT
O) The fine particles are dispersed so that the average particle size is 80 nm or less, and the number of particles having a particle size of 100 nm or more is 1 or less / μm ² .
The electromagnetic wave shielding performance at 1 to 10 MHz is 10 dB or less.

The interlayer film for laminated glass according to claim 2 is
An interlayer film for laminated glass comprising a plasticized polyvinyl butyral resin, wherein the plasticized polyvinyl butyral resin comprises 100 parts by weight of a polyvinyl butyral resin, 30 to 60 parts by weight of a plasticizer, and tin-doped indium oxide (IT
O) fine particles and / or 0.1 to 3 parts by weight of antimony-doped indium oxide (ATO) fine particles;
Tin-doped indium oxide tin-doped indium oxide (ITO) fine particles or antimony-doped indium oxide (ATO) fine particles in the film have an average particle diameter of 80 nm or less, and the number of particles having a particle diameter of 100 nm or more is 1 or less / μm ^2. And the electromagnetic wave shielding performance at 2 to 26.5 GHz is 10 dB when laminated glass is used.
It is characterized by the following.

[0012] The interlayer film for laminated glass according to claim 3 is:
Visible light transmittance of 70% or more, solar radiation transmittance of 80% or less of visible light transmittance, and haze of 1% or less, of the laminated glass sandwiched between two clear glasses having a thickness of 2.5 mm. The electromagnetic wave shielding performance at 0.1 to 10 MHz is 10 dB or less.

The interlayer film for laminated glass according to claim 4 is
Visible light transmittance of 70% or more, solar radiation transmittance of 80% or less of visible light transmittance, and haze of 1% or less, of the laminated glass sandwiched between two clear glasses having a thickness of 2.5 mm. The electromagnetic wave shielding performance at 22 to 26.5 GHz is 10 dB or less.

The details of the present invention will be described below. The interlayer film for laminated glass of the present invention uses a polyvinyl butyral resin, a plasticizer, and a plasticized polyvinyl butyral resin comprising tin-doped indium oxide (ITO) fine particles and / or antimony-doped indium oxide (ATO) fine particles.

As the polyvinyl acetal resin,
Conventionally, resins used as resins for interlayer films for safety glass can be used, and more specifically, a butyralization degree of 60 to 7
A polyvinyl butyral resin having 5 mol% and a degree of polymerization of 800 to 3,000 is preferably used.

As the above-mentioned plasticizer, all of those conventionally used for interlayer films can be used. For example, triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2- Ethyl butyrate (3GH), dihexyl adipate (D
HA), tetraethylene glycol di-heptanoate (4G7), tetraethylene glycol di-2-ethylhexanoate (4GO), and triethylene glycol di-heptanoate (3G7). These may be used alone or in combination of two or more.

The amount of the plasticizer is 30 to 60 parts by weight based on 100 parts by weight of the polyvinyl acetal resin.

In order to impart heat insulation to the interlayer film for laminated glass of the present invention, it is necessary to disperse ITO fine particles and / or ATO fine particles in the plasticized polyvinyl acetal resin. That is, ITO fine particles and / or ATO
Since the fine particles have an excellent infrared (heat ray) cutting function, the resulting interlayer film and the laminated glass can exhibit excellent heat shielding properties.

The amount of the fine ITO particles and / or fine ATO particles is 0.1 to 3 parts by weight based on 100 parts by weight of the polyvinyl acetal resin. When the amount is less than 0.1 part by weight, the infrared ray cut effect is not sufficiently exerted, so that the obtained intermediate film and the heat shielding property of the laminated glass may not be sufficiently improved. And the transmittance of visible light of the laminated glass may be reduced, and the haze may be increased.

The average particle diameter of the above ITO fine particles and / or ATO fine particles is 80 nm or less. Preferably 1
0 to 80 nm. That is, ITO fine particles and / or A
The minimum particle diameter of the TO fine particles is preferably 10 nm or more, and the maximum particle diameter is preferably 80 nm or less.

When the average particle diameter of the ITO fine particles and / or the ATO fine particles exceeds 80 nm, scattering of visible light by the particles becomes remarkable, and the transparency of the obtained interlayer film may be impaired. As a result, haze is deteriorated when laminated glass is used, and it becomes impossible to satisfy high transparency required for a windshield of an automobile, for example. The particle size of the ITO fine particles and / or the ATO fine particles is measured using a light scattering measuring device (“DLS manufactured by Otsuka Electronics Co., Ltd.”
-6000AL ") and dynamic light scattering using an Ar laser as a light source.

The above ITO fine particles and / or ATO fine particles are preferably uniformly and finely dispersed in the interlayer film. By finely dispersing, when used as a laminated glass, low haze and excellent transparency, heat shielding properties are high throughout the interlayer, and furthermore, by being able to adjust the adhesive force between the glass and the interlayer, The penetration resistance is also excellent.

In a preferred embodiment, ITO fine particles and / or ATO fine particles having a particle size of not less than 100 nm
1 or less per m ² . That is, when the intermediate film is photographed and observed with a transmission electron microscope, particles having a particle diameter of 100 nm or more are not observed at all, or even when observed, the particle size is 1 μm.
Placing the particle size 100nm or more particles in the center of the m ² of the frame,
This refers to a state where no other particles having a particle diameter of 100 nm or more are observed in the 1 μm ² frame. The observation with a transmission electron microscope was performed using a transmission electron microscope “H-710” manufactured by Hitachi, Ltd.
This is performed for an image captured at an acceleration voltage of 100 kV using the “0FA type”.

In a preferred embodiment of the interlayer according to the present invention, ITO fine particles and / or AT
The average particle size of the O fine particles is 10 to 80 nm at room temperature, and the dispersion is 10 to 80 nm even after heating to 200 ° C.
Is an interlayer film for laminated glass. When an interlayer film for laminated glass is formed using such a dispersion, the resulting interlayer film has a low haze and excellent transparency in which ITO fine particles and / or ATO fine particles are finely dispersed in the film.
Although the dispersion is described in detail later, it is preferable to use a dispersant as an organic solvent or a plasticizer to prepare ITO fine particles and / or
Or a suspension or solution in which ATO fine particles are dispersed.

When the ITO fine particles are used by dispersing them in an organic solvent, it is preferable to use the same kind of plasticizer as the plasticizer used for the intermediate film as the main dispersion medium. Further, as the main dispersion medium, for example, a dispersant generally used as a dispersant for inorganic fine particles, such as a sulfate ester compound, a phosphate ester compound, a polycarboxylate, and a polyhydric alcohol surfactant is used. be able to.

Further, a chelating agent or a compound having at least one carboxyl group may be used in combination as the main dispersion medium, and the haze can be further improved by the combined use. The chelating agent and the compound having one or more carboxyl groups can obtain sufficient effects even if they are not separately added to the main dispersion medium but are separately added.

The chelating agent is not particularly limited, and EDTAs, β-diketones and the like can be used, but those having good compatibility with plasticizers and resins are preferable. From the viewpoint of compatibility, among the chelating agents, β-diketones are particularly preferable, and among them, acetylacetone is particularly preferably used. In addition to acetylacetone, benzoyltrifluoroacetone or dipivaloylmethane may be used. It is considered that the effect of these chelating agents is that coordination with the ITO fine particles hinders aggregation of the fine particles and improves haze.

The amount of the chelating agent is 0.001 to 100 parts by weight of the polyvinyl acetal resin.
It is preferably 2 parts by weight, more preferably 0.01 to 1 part by weight. When the amount is less than 0.001 part by weight, the effects of preventing aggregation of fine particles and improving the haze are hardly exhibited. When the amount exceeds 2 parts by weight, foaming may occur during film formation or foaming may occur during production of laminated glass.

Examples of the compound having one or more carboxyl groups include an aliphatic carboxylic acid, an aliphatic dicarboxylic acid, an aromatic carboxylic acid, an aromatic dicarboxylic acid, and a hydroxy acid. Acid, phthalic acid, salicylic acid, ricinoleic acid and the like can be used. Among them, C _{2 to} C ₁₈ aliphatic carboxylic acids are preferably used, and more preferably C _{2 to} C ₁₀ aliphatic carboxylic acids. Such aliphatic carboxylic acids include, for example, acetic acid, propionic acid, n-butyric acid, 2-ethylbutyric acid,
Examples thereof include n-hexanoic acid, 2-ethylhexanoic acid, and n-octanoic acid.

The compounding amount of the compound having one or more carboxyl groups may be a polyvinyl acetal resin 100
The amount is preferably 0.001 to 2 parts by weight, more preferably 0.01 to 1 part by weight based on part by weight. 0.0%
When the amount is less than 01 parts by weight, the effects of preventing aggregation of fine particles and improving the haze are hardly exhibited. When the amount is more than 2 parts by weight, the interlayer film may be yellowed, and the adhesive strength between the glass and the film may be impaired.

Further, the interlayer for laminated glass of the present invention may contain an adhesion regulator as required.
It is preferable to use an alkali metal salt or an alkaline earth metal salt as the adhesion regulator. The alkali metal salt or alkaline earth metal salt is not particularly limited, and includes, for example, salts of potassium, sodium, magnesium and the like.Examples of the acid constituting the salt include, for example, octylic acid,
Organic carboxylic acids such as hexyl acid, butyric acid, acetic acid, and formic acid; and inorganic acids such as hydrochloric acid and nitric acid.

Among the above-mentioned adhesive force adjusters, those having 2 to 1 carbon atoms
An alkali metal salt or an alkaline earth metal salt of an organic acid having 6 is more preferable, and a magnesium carboxylate having 2 to 16 carbon atoms or a potassium carboxylate having 2 to 16 carbon atoms is more preferable. The magnesium carboxylate or potassium salt is not particularly limited, and examples thereof include magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, magnesium 2-ethylbutanoate, potassium 2-ethylbutanoate, and magnesium 2-ethylhexanoate. And potassium 2-ethylhexanoate. These may be used alone or in combination of two or more.

The amount of the above-mentioned adhesive force modifier is 0.001 to 0. 0 to 100 parts by weight of the polyvinyl acetal resin.
5 parts by weight is preferred, more preferably 0.01 to 0.2 parts by weight.
Parts by weight. If the compounding amount is less than 0.001 part by weight, the adhesive strength tends to decrease around the laminated glass in an atmosphere of high humidity, and if it exceeds 0.5 part by weight, the adhesive force becomes too low and the transparency of the film is increased. May be lost.

As additives other than those described above, antioxidants for preventing deterioration due to heat in the extruder; ultraviolet absorbers for improving weather resistance and light resistance and various stabilizers can be added.

The interlayer film for a laminated glass of the present invention is not particularly limited, and can be obtained by forming a film by an extrusion method, a calendering method, a press molding method, etc. The molding method is more preferable because the haze can be further improved.

The thickness of the interlayer film for laminated glass of the present invention is as follows:
Although not particularly limited, practically, it is preferably 0.3 to 0.8 mm in consideration of minimum penetration resistance and weather resistance required for a laminated glass. However, in order to improve the penetration resistance or the like, another intermediate film may be laminated on the intermediate film of the present invention, if necessary.

The interlayer film for laminated glass of the present invention has a thickness of 0.1
They have been found to have electromagnetic wave transmission in the frequency bands of 10 to 10 MHz and 2-26.5 GHz. As examples of radio waves using these frequency bands, there are 3.5 MHz band and 7 MHz band of amateur radio, and a frequency band of 10 MHz or less is also used as an emergency communication frequency. Furthermore, VICS (automobile information communication system) uses 2.5 GHz, ETC (automatic toll collection system for toll road) uses 5.8 GHz, and satellite broadcasting uses 12 GHz. .

The interlayer for laminated glass of the present invention has a thickness of 0.1
By setting the electromagnetic wave shielding performance in the frequency bands of 10 to 10 MHz and 2-26.5 GHz to 10 dB or less, electromagnetic waves in the above frequency band can be passed without any problem.

The glass used for the laminated glass of the present invention is not particularly limited, and generally used transparent plate glass can be used.
The use of a heat ray absorbing glass having a transmittance of 65% or less in the entire wavelength region of 300 nm. This is because the infrared cut property of ITO is larger on the long wavelength side than
This is due to the relatively small size in the range of 0 to 1,300 nm. Therefore, by combining the interlayer film of the present invention with the above-mentioned heat ray absorbing glass, the solar transmittance can be lowered even for the same visible light transmittance as compared with the case of combining with the clear glass, and the solar cut rate is improved. be able to.

The above laminated glass has a visible light transmittance of 7
0% or more, the solar radiation transmittance is 80% or less of the visible light transmittance,
By setting the haze to 1% or less, the heat shielding property, the transparency, and the electromagnetic wave transmittance become remarkably excellent.

[0041]

Embodiments of the present invention will be described below. The following items were evaluated for the laminated glass. 1) Optical properties The transmittance of the laminated glass at 300 to 2,500 nm was measured using a direct-write spectrophotometer (“UV3100” manufactured by Shimadzu Corporation), and the measurement was performed according to JIS Z 8722 and JISR 31.
06, the visible light transmittance of 380 to 780 nm (T
v) and solar transmittance (Ts) of 300 to 2,500 nm
I asked.

2) Haze (H) Measured according to JIS K6714.

3) Electromagnetic Wave Transmittance A reflection loss value (dB) in the range of 0.1 to 10 MHz by KEC method measurement (measurement of electromagnetic wave shielding effect in the near field).
Was compared with a normal float glass single plate having a thickness of 2.5 mm, and the minimum and maximum values of the difference at the above frequencies were described. Further, a return loss value (dB) in a range of 2 to 26.5 GHz.
Is a sample of 600 m between a pair of antennas for transmission and reception.
The m angle was set, the radio wave from the radio signal generator was received by a spectrum analyzer, and the shielding property of the sample was evaluated (far field electromagnetic wave measurement method).

4) Pummel Value The adhesion of the interlayer film to glass is evaluated by the Pummel value. The details of the test method are as follows. The higher the Pummel value, the higher the adhesion to glass, and the lower the Pummel value, the lower the adhesion. The laminated glass was allowed to stand at a temperature of -18 ± 0.6 ° C. for 16 hours, adjusted, and crushed with a hammer of 0.45 kg on the head until the particle size of the glass became 6 mm or less. The degree of exposure of the film after the glass was partially peeled was determined by a sample graded in advance, and the result was expressed as a Pummel value according to Table 1.

[0045]

[Table 1]

Example 1 (1) Synthesis of Polyvinyl Butyral To 2,890 parts by weight of pure water, 275 parts by weight of polyvinyl alcohol having an average degree of polymerization of 1,700 and a saponification degree of 99.2 mol% were added and dissolved by heating. . The temperature of the reaction system was adjusted to 15 ° C., 201 parts by weight of 35% by weight hydrochloric acid and 157 parts by weight of n-butyraldehyde were added, and the temperature was maintained to precipitate a reaction product. Thereafter, the reaction system was maintained at 60 ° C. for 3 hours to complete the reaction, washed with excess water to wash away unreacted n-butyraldehyde, and the hydrochloric acid catalyst was washed with a general-purpose neutralizing agent, sodium hydroxide aqueous solution. The mixture was neutralized, washed with excess water for 2 hours, and dried to obtain a white powdery polyvinyl butyral resin. The average butyral degree of this resin was 68.5 mol%.

(2) Preparation of ITO-dispersed plasticizer 1 part by weight of ITO fine particles was added to 40 parts by weight of 3GO, and a polyphosphate ester salt was used as a dispersing agent. Dispersed. Thereafter, acetylacetone 0.1 was added to the dispersion.
One part by weight was added under stirring to prepare an ITO dispersed plasticizer. The average particle size of the ITO fine particles during dispersion was 35 nm.

(3) Production of interlayer film for laminated glass The above-mentioned ITO-dispersed plasticizer is 40 parts by weight based on 100 parts by weight of the polyvinyl butyral resin obtained above, and the Mg content is 60 ppm based on the whole system. After adding an appropriate amount of magnesium 2-ethylbutyrate and sufficiently kneading the mixture with a mixing roll, the mixture was heated to 150 ° C. using a press molding machine.
For 30 minutes to obtain an intermediate film having an average film thickness of 0.76 mm. The average particle size of the ITO fine particles in the film was 56 nm, and particles having a particle size of 100 nm or more were not observed.

(4) Production of laminated glass The interlayer film for laminated glass obtained above was sandwiched from both ends with transparent float glass (length 30 cm × width 30 cm × thickness 2.5 mm), and this was placed in a rubber bag. put in,
After degassing at a degree of vacuum of 2.6 kPa for 20 minutes, the substrate was transferred to an oven while being degassed, and further vacuum-pressed while being kept at 90 ° C. for 30 minutes. The laminated glass thus pre-compressed is placed in an autoclave at 135 ° C. under a pressure of 1.2 M.
Pressure bonding was performed for 20 minutes under the conditions of Pa to obtain a laminated glass. The visible light transmittance (T
v), solar transmittance (Ts), haze (H), electromagnetic wave transmittance (ΔdB), and Pummel were measured, and the results are shown in Table 1.

Example 2 ITO in ITO dispersed plasticizer
Was made in the same manner as in Example 1 except that the weight of the laminated glass was changed from 1 part by weight to 1.6 parts by weight.
The same items as in the above were measured, and the results are shown in Table 1.

Example 3 ITO in ITO dispersed plasticizer
Was prepared in the same manner as in Example 1 except that the weight of the laminated glass was changed from 1 part by weight to 2.8 parts by weight.
The same items as in the above were measured, and the results are shown in Table 1.

Comparative Example 1 A laminated glass was produced in the same manner as in Example 1 except that no ITO, dispersant and acetylacetone were added, and the same items as in Example 1 were measured. The results are shown in Table 1.

(Comparative Example 2) One piece of float glass used for producing a laminated glass using a normal interlayer (average thickness 0.76 mm) containing no ITO at all was used as a heat ray reflective glass to produce a laminated glass. After that, the same items as in Example 1 were measured, and the results are shown in Table 1.

(Comparative Example 3) PET (polyethylene terephthalate) coated with a heat ray reflective coating with two ordinary interlayer films (average thickness 0.38 mm) containing no ITO at all
After sandwiching the plate and sandwiching the transparent float glass from both ends to produce a laminated glass, the same items as in Example 1 were measured, and the results are shown in Table 1.

(Comparative Example 4) In the production of the intermediate film,
A laminated glass was produced in the same manner as in Example 1 except that the amount of O was changed to 0.03 parts by weight, and then the same items as in Example 1 were measured. The results are shown in Table 1.

(Comparative Example 5) In the production of the intermediate film,
Example 1 was repeated except that the amount of O was changed to 3.6 parts by weight.
After preparing a laminated glass in the same manner as in Example 1, the same items as in Example 1 were measured, and the results are shown in Table 1.

[0057]

[Table 2]

[0058]

The interlayer film for laminated glass and the laminated glass according to the present invention have the above-mentioned constitution, and are excellent in transparency and heat shielding and have good electromagnetic wave transmittance. Therefore, even when used as a window glass of an automobile, there is no adverse effect on communication functions of a mobile phone, a car navigator, a garage opener, an automatic toll collection system, and the like.

In particular, the visible light transmittance for light having a wavelength of 380 to 780 nm is set to a specific value or more, and a wavelength of 300 to 780 nm is used.
By setting the solar radiation transmittance and haze to 2,500 nm light rays and the electromagnetic wave shielding performance for electromagnetic waves of frequencies 0.1 to 10 MHz and 2 to 26.5 GHz to specific values or less, the above-mentioned heat shielding property, transparency and electromagnetic wave transparency are improved. It is remarkably excellent.

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Claims (5)

[Claims] 1. An interlayer film for laminated glass comprising a plasticized polyvinyl butyral resin, wherein the plasticized polyvinyl butyral resin is a polyvinyl butyral resin 100.
Parts by weight of a plasticizer, 30 to 60 parts by weight, and 0.1 to 3 parts by weight of tin-doped indium oxide (ITO) fine particles and / or antimony-doped indium oxide (ATO) fine particles. IT
O) fine particles or antimony-doped indium oxide (AT
O) The fine particles are dispersed so that the average particle size is 80 nm or less, and the number of particles having a particle size of 100 nm or more is 1 or less / μm ² .
An interlayer film for laminated glass, wherein an electromagnetic wave shielding performance at 1 to 10 MHz is 10 dB or less. 2. An interlayer film for laminated glass comprising a plasticized polyvinyl butyral resin, wherein the plasticized polyvinyl butyral resin is a polyvinyl butyral resin 100.
Parts by weight, 30-60 parts by weight of a plasticizer, and 0.1-3 parts by weight of tin-doped indium oxide (ITO) fine particles and / or antimony-doped indium oxide (ATO) fine particles, and further, tin-doped indium tin oxide in the film. The doped indium oxide (ITO) fine particles or the antimony-doped indium oxide (ATO) fine particles are dispersed so that the average particle diameter is 80 nm or less, and the number of particles having a particle diameter of 100 nm or more is 1 or less / μm ^2. An interlayer for laminated glass, which has an electromagnetic wave shielding performance of 10 dB or less at 2 to 26.5 GHz when formed into a laminated glass. 3. The visible light transmittance of the laminated glass produced between two clear glasses having a thickness of 2.5 mm is 70.
%, The solar radiation transmittance is 80% or less of the visible light transmittance, the haze is 1% or less, and the electromagnetic wave shielding performance at 0.1 to 10 MHz is 10 dB or less. . 4. A laminated glass sandwiched between two clear glasses having a thickness of 2.5 mm has a visible light transmittance of 70%.
% Or more, the solar radiation transmittance is 80% or less of the visible light transmittance, the haze is 1% or less, and the electromagnetic wave shielding performance at 2 to 26.5 GHz is 10 dB or less. . 5. A laminated glass comprising the interlayer film for laminated glass according to claim 1.