JP2001327917A - Method for producing functional film and functional film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a functional film which can develop various functions by an application method. SOLUTION: The method having a process in which a liquid in which functional fine particles are dispersed is applied on a support and dried to form a layer containing the functional fine particles, the layer is compressed, and the compressed layer of the functional fine particles is formed and a process in which the liquid is subjected to ultrasonic treatment at least before or after the application process and the functional film are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a functional film. In the present invention, the functional film is defined as follows. That is, the functional film is a film having a function, and the function means a function performed through physical and / or chemical phenomena. Functional films include conductive films, magnetic films, ferromagnetic films, dielectric films, ferroelectric films, electrochromic films, electroluminescent films, insulating films, light absorbing films,
Films having various functions such as a light selective absorption film, a reflection film, an antireflection film, a catalyst film, and a photocatalyst film are included.

[0002] In particular, the present invention relates to a transparent conductive film.
The transparent conductive film is an electroluminescent panel electrode,
It can be used as a transparent electrode such as an electrochromic element electrode, a liquid crystal electrode, a transparent surface heating element, and a touch panel, and can also be used as a transparent electromagnetic wave shielding film.

[0003]

2. Description of the Related Art Conventionally, functional films made of various functional materials have been produced by physical vapor deposition (PVD) such as vacuum deposition, laser ablation, sputtering, ion plating, thermal CVD, optical CVD, and the like. It is manufactured by chemical vapor deposition (CVD) such as plasma CVD. These generally require a large-scale apparatus, and some of them are not suitable for forming a large-area film.

[0004] Further, formation of a film by coating using a sol-gel method is also known. The sol-gel method is also suitable for forming a large-area film, but often requires sintering the inorganic material at a high temperature after coating.

For example, a transparent conductive film is as follows. At present, transparent conductive films are mainly manufactured by a sputtering method. There are various methods of sputtering, for example, accelerated collision of inert gas ions generated by direct current or high-frequency discharge in a vacuum onto the target surface, and strike out atoms constituting the target from the surface,
This is a method of forming a film by depositing it on the substrate surface.

The sputtering method is excellent in that a conductive film having a low surface electric resistance can be formed even with a relatively large area. However, there is a disadvantage that the apparatus is large and the film forming speed is low. As the area of the conductive film is further increased in the future, the size of the device will be further increased. This technically causes problems such as the necessity of increasing control accuracy, and another problem arises that manufacturing costs increase. Further, the number of targets is increased to compensate for the low film formation speed, and the speed is increased. However, this also causes a problem in that the size of the apparatus is increased.

[0007] Production of a transparent conductive film by a coating method has also been attempted. In a conventional coating method, a conductive paint in which conductive fine particles are dispersed in a binder solution is applied on a substrate, dried, and cured to form a conductive film. The coating method has such advantages that a large-area conductive film can be easily formed, the apparatus is simple, the productivity is high, and the conductive film can be manufactured at lower cost than the sputtering method. In the coating method, the conductive fine particles come into contact with each other to form an electric path, thereby exhibiting conductivity. However, a conductive film produced by a conventional coating method has a defect that the contact is insufficient and the resulting conductive film has a high electric resistance value (poor in conductivity), and its use is limited.

As a method for producing a transparent conductive film by a conventional coating method, for example, Japanese Patent Application Laid-Open No. 9-109259 discloses a method in which a paint composed of a conductive powder and a binder resin is applied onto a transfer plastic film, dried, and dried. First step of forming a layer, pressurizing the conductive layer surface to a smooth surface (5 to 100 kg / cm
² ), a second step of heating (70 to 180 ° C.) and a third step of laminating this conductive layer on a plastic film or sheet and thermocompression bonding are disclosed.

In this method, a large amount of binder resin is used (in the case of inorganic conductive powder, binder 1
100 parts by weight, 100 to 500 parts by weight of conductive powder, and in the case of organic conductive powder, 0.1 to 30 parts by weight of conductive powder with respect to 100 parts by weight of binder)
A transparent conductive film having a low electric resistance cannot be obtained.

For example, Japanese Patent Application Laid-Open No. 8-199096 discloses a method for forming a binder-free conductive film comprising tin-doped indium oxide (ITO) powder, a solvent, a coupling agent, and an organic or inorganic acid salt of a metal. A method is disclosed in which a paint is applied to a glass plate and fired at a temperature of 300 ° C. or higher. In this method, since no binder is used, the electric resistance of the conductive film is reduced. But 300 ° C
Since it is necessary to perform the firing step at the above temperature, it is difficult to form a conductive film on a support such as a resin film. That is, the resin film is melted, carbonized, or burned by the high temperature. Depending on the type of resin film, for example, polyethylene terephthalate (P
For ET) films, a temperature of 130 ° C. would be the limit.

As a method other than the coating method, see Japanese Patent Application Laid-Open No.
Japanese Patent No. 3785 discloses a powder compression layer in which at least a part, preferably all of the voids of a skeleton structure composed of a conductive substance (metal or alloy) powder is filled with a resin, and a resin under the powder compressed layer. A conductive coating comprising a layer is disclosed.
The production method will be described by taking a case where a film is formed on a plate material as an example. According to the publication, first, a resin, a powdery substance (metal or alloy), and a plate material to be processed are vibrated or stirred in a container together with a film forming medium (steel balls having a diameter of several mm). A resin layer is formed on the surface. Subsequently, the powder material is captured and fixed to the resin layer by the adhesive force of the resin layer. Further, the vibrating or agitating film-forming medium exerts a striking force on the vibrating or agitating powder material to form a powder compaction layer. A significant amount of resin is required to obtain the effect of fixing the powder compression layer. Further, the production method is more complicated than the coating method.

As a method other than the coating method, see JP-A-9-19-1
JP-A-07195 discloses a method in which conductive short fibers are sprinkled and deposited on a film such as PVC, and this is subjected to a pressure treatment to form a conductive fiber-resin integrated layer. The conductive short fiber is a short fiber such as polyethylene terephthalate, which is coated with nickel plating or the like. The pressing operation is preferably performed under a temperature condition at which the resin matrix layer shows thermoplasticity.
A high temperature / low pressure condition of / cm ² is disclosed.

[0013]

From such a background,
A functional film that can easily form a large-area functional film, is simple to use, has high productivity, and can produce a functional film at a low cost. Development of the resulting method is desired.

Particularly, regarding the conductive film, a large-area conductive film can be easily formed, the apparatus is simple, and the productivity is high.
It is desired to develop a method for obtaining a transparent conductive film having a low electric resistance value while taking advantage of the application method that a conductive film can be manufactured at low cost.

Accordingly, an object of the present invention is to provide a method for producing a functional film capable of expressing various functions by a coating method, and a functional film.

In particular, an object of the present invention is to provide a method for producing a transparent conductive film having a low resistance value by a coating method, and a transparent conductive film. Another object of the present invention is to provide a method for producing a transparent conductive film capable of forming a film without requiring a high-temperature heating operation and obtaining a uniform and uniform thickness film, and a transparent conductive film.

[0017]

Means for Solving the Problems Conventionally, in a coating method,
If a large amount of binder resin is not used, a functional film cannot be formed, or if no binder resin is used,
It was thought that a functional film could not be obtained unless the functional material was sintered at a high temperature.

Regarding the conductive film, the conductive film cannot be formed unless a large amount of binder resin is used, or if the binder resin is not used, the conductive material must be sintered at a high temperature. It was thought that it could not be obtained.

However, as a result of intensive studies, the present inventor has found that
Surprisingly, it was found that a functional film having mechanical strength and capable of exhibiting various functions can be obtained by compression without using a large amount of binder resin and without firing at a high temperature. The invention has been reached. The present inventor has found that when a conductive substance is used, a transparent conductive film having a low resistance value can be obtained. It has been found that it is important to uniformly disperse the functional fine particles constituting the transparent conductive film or the like at the time of coating, and it has been found that ultrasonic treatment is extremely effective.

That is, the object of the present invention is achieved by the following constitutions. (1) A liquid in which functional fine particles are dispersed is coated on a support,
Drying, forming a functional fine particle-containing layer, and then compressing the functional fine particle-containing layer to form a compressed layer of functional fine particles, at least one of before and after the coating step. A method for producing a functional film, comprising a step of performing ultrasonic treatment on a liquid in which fine particles are dispersed. (2) The method for producing a functional film according to the above (1), wherein the ultrasonic treatment is performed on a liquid in which functional fine particles are dispersed before coating. (3) The method for producing a functional film according to the above (1) or (2), wherein the ultrasonic treatment is performed on a liquid in which functional fine particles are dispersed after coating. (4) The ultrasonic treatment is performed at an oscillation frequency of 10 kHz to 2 kHz.
The method for producing a functional film according to any one of the above (1) to (3), which is performed under operating conditions of 00 kHz and an ultrasonic amplitude of 10 to 100 μm. (5) The method for producing a functional film according to any one of (1) to (4), wherein the functional film is compressed by a compression force of 44 N / mm ² or more. (6) The method for producing a functional film according to any one of (1) to (5), wherein the compression is performed at normal temperature. (7) The method for producing a functional film according to any one of (1) to (6), wherein the compression is performed using a roll press machine. (8) The method for producing a functional film according to any one of (1) to (7) above, wherein the functional fine particles are conductive fine particles and have a function as a conductive film. (9) The conductive fine particles include tin oxide, indium oxide, zinc oxide, cadmium oxide, antimony-doped tin oxide (ATO), fluorine-doped tin oxide (FTO), tin-doped indium oxide (ITO), and aluminum-doped zinc oxide ( (8) The method for producing a functional film according to the above (8), which is a conductive inorganic fine particle selected from AZO). (10) The above (1) to (9), wherein the support is a resin.
The method for producing a functional film according to any one of the above. (11) A functional film produced by any one of the above (1) to (10). (12) The functional film includes a conductive film, a magnetic film, a ferromagnetic film, a dielectric film, a ferroelectric film, an electrochromic film,
The functional film according to the above (11), which is selected from an electroluminescent film, an insulating film, a light absorbing film, a light selective absorbing film, a reflective film, an antireflective film, a catalyst film and a photocatalytic film.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The method for producing a functional film of the present invention comprises:
A liquid in which functional fine particles are dispersed is coated on a support, dried,
Forming a functional fine particle-containing layer, thereafter, compressing the functional fine particle-containing layer, comprising a step of forming a compressed layer of functional fine particles, with respect to the liquid in which the functional fine particles are dispersed, at least of the coating It has a step of performing ultrasonic treatment before or after.

First, an ultrasonic processing apparatus used in the method for manufacturing a magnetic recording medium according to the present invention will be described with reference to FIG. As shown in FIG. 1, the ultrasonic processing apparatus includes an ultrasonic processing tank 20 for performing ultrasonic processing while passing a functional fine particle dispersion liquid (paint) 3 to be processed,
The functional fine particle dispersion 3 inserted into the ultrasonic treatment tank 20
Horn 30 for applying ultrasonic vibration to the horn, and an ultrasonic vibrator 40 connected to the base side of the ultrasonic horn 30
And An ultrasonic generator 43 is connected to the ultrasonic transducer 40. Usually, on the ultrasonic transducer 40, an amplitude detector 41 is formed continuously, and an amplitude indicator 42 is connected to this. Ultrasonic treatment tank 20
Is connected to the stirring tank 2 via the pump 4.

The ultrasonic horn 30 inserted into the ultrasonic treatment tank 20 (particularly, the inner casing 21) is provided with an operating end face 31 for applying ultrasonic vibration to the functional fine particle dispersion.
(Horn tip), the ultrasonic horn 30
The working depth H defined by the distance from the working end face 31 to the wall face 23 of the ultrasonic treatment tank 20 facing the working end face 31 is set to 2 to 40 mm, more preferably 2 to 30 mm.

Further, the effective dispersion chamber volume V0 defined by the area S and the operation depth H of the working end face 31 of the ultrasonic horn 30 is slightly different depending on the size of the ultrasonic treatment tank 20, but is preferably 0. .6~80cm ^3, even more preferably 0.9
It is ~60cm ^3. When the operating depth H becomes extremely small and becomes smaller than 2 mm, the ultrasonic vibration causes the working end face 31 of the ultrasonic horn 30 or the wall surface 23 of the ultrasonic processing tank facing the working end face 31 to be extremely worn (erosion). Or an abrupt increase in the liquid temperature, an extreme increase in the pressure in the effective dispersion chamber volume V0, and further, problems such as overdispersion. On the other hand, the operating depth H
However, if it exceeds 40 mm, there are disadvantages that a relatively long ultrasonic irradiation time is required and that uniformity of dispersion is lacking. If the effective dispersion chamber volume V0 becomes too small, the same disadvantages as when the operating depth H becomes extremely small occur. If the effective dispersion chamber volume V0 becomes too large, the operating depth H becomes extremely small. Has the same disadvantages as if it were too large.

An ultrasonic vibrator 40 is connected to the base side of the ultrasonic horn 30 having such an operating end face 31. Ultrasonic waves emitted from the ultrasonic vibrator 40 are transmitted through the ultrasonic horn 30. And then from the working end face 31 to the magnetic paint. The size of the ultrasonic horn 30 to be used is not particularly limited, but is usually about 20 to 50 mm in diameter.

The ultrasonic processing conditions of the present invention using such an ultrasonic processing apparatus 10 include an oscillation frequency of 10 kHz to 2 kHz.
00 kHz, ultrasonic amplitude of the working end face 31 10 to 100 μ
m.

The functional fine particle dispersion 3 sent out from the tank 2 at a flow rate Q (l / sec) passes through a sonicator through a pump 4 and a filter (not shown).
Finally, it is sent to the coating section via a pump and a filter (not shown). In this case, assuming that the effective dispersion chamber volume of the ultrasonic processing apparatus is V0a (all units are 1), the ultrasonic irradiation time t is represented by t = V0a / Q. Therefore, once the ultrasonic irradiation time t and the effective dispersion chamber volume of the ultrasonic treatment device are determined, the flow rate Q of the functional fine particle dispersion 3 may be adjusted so as to obtain the ultrasonic irradiation time t. In the case of this pass processing, ultrasonic irradiation from the ultrasonic processing apparatus is performed continuously without interruption.

The functional fine particle dispersion liquid subjected to the ultrasonic treatment as described above is supplied to a coating section, where it is coated on a support.

In the present invention, the ultrasonic treatment may be performed before or after the application, and it is more effective to use both of them in combination. When performing ultrasonic treatment after coating, for example, an apparatus as shown in FIGS. 2 and 3 schematically show an apparatus for performing ultrasonic treatment after applying a functional fine particle dispersion, and FIG.
Is a plan view and FIG. 3 is a side view.

That is, an appropriate frequency and an appropriate frequency are applied to a support 22 provided with an undried coating layer 21 through a flexural vibration plate 25 attached to the tip of an amplitude amplification horn 24 of an ultrasonic vibration generator 23. Ultrasonic vibration of the form is applied, which gives a large shear to the functional fine particles constituting the coating layer 21.

The ultrasonic wave used here is preferably under the same conditions as described above. Various modes of vibration of the flexural diaphragm 25 can be obtained depending on the size, shape, material, and the like of the diaphragm 25 with respect to frequency. However, the present invention is not particularly limited by these modes, and the present invention is not limited thereto. What is necessary is just to adjust to the thing suitable for the material of a microparticle, the size of a coating layer, etc.

In order to effectively transmit the vibration from the diaphragm 25, the diaphragm 25 is installed at a position where the support 21 has an appropriate angle of incidence and an angle of emergence with respect to the diaphragm 25, and It is preferable to apply a pressing force to the substrate.

In the present invention, the functional film is not particularly limited, and may be a conductive film, a magnetic film, a ferromagnetic film, a dielectric film, a ferroelectric film, an electrochromic film, an electroluminescent film, an insulating film, Light absorption film, light selective absorption film,
Films having various functions such as a reflection film, an antireflection film, a catalyst film, and a photocatalyst film are included. Therefore, in the present invention, the functional fine particles that constitute the target film are used.
The functional fine particles are not particularly limited, and mainly inorganic fine particles having a cohesive force are used. In the production of any functional film, by applying the present invention,
A functional film having sufficient mechanical strength is obtained,
The problem caused by the binder resin in the conventional coating method using a large amount of the binder resin can be eliminated.
As a result, the intended function is further improved.

For example, in the production of a transparent conductive film, tin oxide, indium oxide, zinc oxide, cadmium oxide, antimony-doped tin oxide (ATO), fluorine-doped tin oxide (FTO), tin-doped indium oxide (ITO), aluminum Conductive inorganic fine particles such as doped zinc oxide (AZO) are used. Alternatively, organic conductive fine particles may be used. By applying the present invention, excellent conductivity is obtained.

In the production of a ferromagnetic film, γ-Fe ₂ O ₃
, Fe ₃ O ₄ , Co—FeO _x , iron oxide-based magnetic powder such as Ba ferrite, α-Fe, Fe—Co, Fe—N
i, a ferromagnetic alloy powder containing a ferromagnetic metal element such as Fe-Co-Ni, Co, or Co-Ni as a main component is used.
By applying the present invention, the saturation magnetic flux density of the magnetic coating film is improved.

In the production of a dielectric film or a ferroelectric film,
Magnesium titanate, barium titanate, strontium titanate, lead titanate, lead zirconate titanate (PZT), lead zirconate, lanthanum-added lead zirconate titanate (PLZT), magnesium silicate Fine particles of a dielectric or ferroelectric material such as a system and a lead-containing perovskite compound are used. By applying the present invention,
An improvement in dielectric characteristics or ferroelectric characteristics can be obtained.

In the production of metal oxide films exhibiting various functions, iron oxide (Fe ₂ O ₃ ), silicon oxide (SiO ₂
), Aluminum oxide (Al ₂ O ₃ ), titanium dioxide (TiO ₂ ), titanium oxide (TiO), zinc oxide (Zn)
Fine particles of metal oxides such as O), zirconium oxide (ZrO ₂ ), and tungsten oxide (WO ₃ ) are used. By applying this manufacturing method, the degree of filling of the metal oxide in the film is increased, and each function is improved. For example, when SiO ₂ or Al ₂ O ₃ supporting a catalyst is used, a porous catalyst film having practical strength can be obtained. When TiO ₂ is used, the photocatalytic function can be improved. In addition, WO
_{When 3} is used, an improvement in the coloring effect in the electrochromic display element can be obtained.

In the production of an electroluminescence film, zinc sulfide (ZnS) fine particles are used.
By applying the present invention, an inexpensive electroluminescent film can be manufactured by a coating method.

The particle diameter r of these functional fine particles differs depending on the use of the functional film, for example, depending on the required degree of scattering, etc., and cannot be said unconditionally depending on the shape of the particles. Particle size r = 10 μm or less;
1.0 μm or less is preferable, and 5 nm to 100 nm is more preferable.

It is preferable that the functional film containing the fine particles does not contain a resin when compressed. That is, resin amount =
It is preferably 0. If a resin is not used in the conductive film, the resin does not hinder contact between the conductive fine particles. Therefore, conductivity between the conductive fine particles is ensured, and the obtained conductive film has a low electric resistance value.
Although it is possible to include a resin as long as the amount does not impair the conductivity, the amount is small compared to the amount used as a binder resin in the related art. If the resin is used in such an amount that it plays a role as a binder, contact between the conductive fine particles is hindered by the binder, electron transfer between the fine particles is hindered, and the conductivity is reduced.

Even in a functional film using WO ₃ fine particles or TiO ₂ fine particles, if no resin is used, the resin does not hinder contact between the fine particles.
Each function is improved. As long as the contact between the fine particles is not hindered and the respective functions are not impaired, it is possible to include a resin, but the amount is one volume of the functional fine particles.
When it is set to 00, it is preferably less than 25% by volume, more preferably less than 20% by volume.

In the present invention, the resin is not particularly limited, and a thermoplastic resin or a polymer having rubber elasticity can be used alone or in combination of two or more. Examples of the resin include a fluoropolymer, a silicone resin, an acrylic resin, polyvinyl alcohol, carboxymethylcellulose, hydroxypropylcellulose, regenerated cellulose diacetylcellulose, polyvinyl chloride, polyvinylpyrrolidone, polyethylene, polypropylene, SBR, polybutadiene, and polyethylene oxide. No.

Examples of the fluorine-based polymer include polytetrafluoroethylene, polyvinylidene fluoride (PVDF),
Examples thereof include vinylidene fluoride-ethylene trifluoride copolymer, ethylene-tetrafluoroethylene copolymer, and propylene-tetrafluoroethylene copolymer. Further, a fluorine-containing polymer in which hydrogen in the main chain is substituted with an alkyl group can also be used. The higher the density of the resin, the smaller the volume, even if a large weight is used, and it is easy to satisfy the requirements of the present invention.

Although the resin has an effect of reducing scattering of the conductive film, it also increases the electric resistance of the conductive film. The reason is that the contact between the conductive fine particles is hindered by the insulating resin, and when the amount of the resin is large, the fine particles do not contact each other, so that the electron transfer between the fine particles is hindered. Therefore, it is preferable to use both the improvement of haze and the securing of conductivity between the conductive fine particles.

If the amount of the resin is small, the electric resistance of the conductive film decreases when the compression pressure in the compression step is increased. This is considered to mean that the conductive fine particles come into contact with each other as the compression pressure is increased. In this case, since the amount of the resin is small, it is considered that almost all of the voids of the conductive fine particles exist in the compressed layer of the conductive fine particles. However, when a larger amount of resin is used, increasing the compression pressure in the compression step tends to increase the electrical resistance of the conductive film. this is,
It is considered that since the amount of the resin is large, as the compression pressure is increased, the resin is pushed between the conductive fine particles, and the conductive fine particles are separated from each other.

The specific resin content is preferably 25% by volume when the volume of the functional fine particles is 100.
Less than 20% by volume, more preferably less than 3.7% by volume. In the present invention, the content of the resin is most preferably 0.

In a catalyst film using Al ₂ O ₃ fine particles or the like, if no resin is used, the surface of the fine particles having a catalytic function is not covered with the resin. For this reason,
The function as a catalyst is improved. In the catalyst film, the more voids inside the film, the more active sites as a catalyst, and from this viewpoint, it is preferable to use no resin.

As described above, it is preferable not to use a resin at the time of compression for the functional film, and even if it is used, a small amount is preferable. The amount of the resin when used depends on the purpose of the functional film,
Since it may vary to some extent, it may be determined appropriately.

In the present invention, in order to obtain a functional film, a liquid in which functional fine particles selected from the above various functional fine particles are dispersed according to the purpose of the functional film is used as a functional paint. This functional paint is applied on a support and dried to form a layer containing functional fine particles. Thereafter, the layer containing the functional fine particles is compressed to form a compressed layer of the functional fine particles to obtain a functional film.

The liquid in which the functional fine particles such as the conductive fine particles are dispersed is not particularly limited, and various known liquids can be used. For example, as a liquid, saturated hydrocarbons such as hexane, aromatic hydrocarbons such as toluene and xylene, alcohols such as methanol, ethanol, propanol and butanol, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and diisobutyl ketone , Ethyl acetate, esters such as butyl acetate, ethers such as tetrahydrofuran, dioxane, diethyl ether, N, N-dimethylformamide;
Examples include amides such as N-methylpyrrolidone (NMP) and N, N-dimethylacetamide, and halogenated hydrocarbons such as ethylene chloride and chlorobenzene. Among these, a liquid having polarity is preferable,
Especially alcohols such as methanol and ethanol, NMP
Those having an affinity for water, such as amides, have good dispersibility even without using a dispersant, and are suitable. These liquids can be used alone or in combination of two or more. Further, a dispersant can be used depending on the type of the liquid.

Further, water can be used as the liquid.
When water is used, the support needs to be hydrophilic. Since the resin film is usually hydrophobic, it easily repels water, and it is difficult to obtain a uniform film. When the support is a resin film, it is necessary to mix alcohol with water or to make the surface of the support hydrophilic.

The amount of the liquid used is not particularly limited as long as the dispersion of the fine particles has a viscosity suitable for coating. For example, the liquid is about 100 to 100,000 parts by weight based on 100 parts by weight of the fine particles. It may be appropriately selected according to the types of the fine particles and the liquid.

The fine particles may be dispersed in the liquid by a known dispersion technique. For example, it can be dispersed by a sand grinder mill method or the like. At the time of dispersion, it is also preferable to use a medium such as zirconia beads in order to loosen the aggregation of the fine particles. At the time of dispersion, care should be taken not to mix impurities such as dust.

Various additives may be added to the dispersion of the fine particles as long as the performance required for each function such as conductivity and catalysis is satisfied. For example, ultraviolet absorbers,
It is an additive such as a surfactant and a dispersant.

The support is not particularly limited, and may be a resin film, glass, ceramics, metal, cloth,
Various materials such as paper can be used. However, in the case of glass, ceramics, and the like, it is highly likely that the glass will be broken at the time of compression in a later step, and therefore it is necessary to consider this point. The shape of the support may be a film, a foil, a mesh, a fabric, or the like.

As the support, a resin film which does not break even when the compression force in the compression step is increased is preferable. As described below, the resin film is also preferable in that it has good adhesion of a layer of functional fine particles such as conductive fine particles to the film, and is also suitable for applications requiring light weight. In the present invention, a resin film can be used as a support because there is no pressurizing step at a high temperature or a firing step.

Examples of the resin film include a polyester film such as polyethylene terephthalate (PET), a polyolefin film such as polyethylene and polypropylene, a polycarbonate film, an acrylic film, a norbornene film (arton, manufactured by JSR Corporation) and the like. .

In a resin film such as a PET film, a part of functional fine particles such as conductive fine particles which are in contact with the PET film during the compression step after drying is made of PET.
It feels like it is embedded in the film, and this fine particle layer adheres well to the PET film. In the case of a hard material such as glass or a resin film having a hard film surface, the fine particles are not embedded and the adhesion between the fine particle layer and the support cannot be obtained. In that case, a soft resin layer is formed in advance on a glass surface or a hard film surface,
It is preferable to apply, dry and compress the fine particles. After the compression, the soft resin layer may be cured by heat, ultraviolet light, or the like.

It is preferable that the soft resin layer does not dissolve in the liquid in which the fine particles are dispersed. In the conductive film, when the resin layer is dissolved, a solution containing the resin comes around the conductive fine particles due to a capillary phenomenon, and as a result, the electric resistance value of the obtained conductive film increases. Also in the catalyst film, the solution containing the resin comes around the fine particles having the catalytic function due to the capillary phenomenon, and the catalytic function is reduced.

When a hard metal is used as the support, the adhesion between the fine particle layer and the support is poor. Therefore, the surface of the support metal may be treated with a resin or a soft metal (may be an alloy). .

The dispersion of the fine particles is coated on the support and dried to form a layer containing functional fine particles such as a layer containing conductive fine particles. The application of the fine particle dispersion on the support can be performed by a known method without any particular limitation. For example, it can be performed by a coating method such as a reverse roll method, a direct roll method, a blade method, a knife method, an extrusion nozzle method, a curtain method, a gravure roll method, a bar coat method, a dip method, a kiss coat method, and a squeeze method. Further, the dispersion liquid can be attached to the support by spraying or spraying.

The drying temperature depends on the type of liquid used for dispersion, but is preferably about 10 to 150 ° C. If the temperature is lower than 10 ° C., dew condensation of moisture in the air tends to occur, and if the temperature exceeds 150 ° C., the resin film support is deformed. At the time of drying, care is taken so that impurities do not adhere to the surface of the fine particles.

The thickness of the functional fine particle-containing layer such as the conductive fine particle-containing layer after coating and drying depends on the compression conditions in the next step and the use of each functional film such as the final conductive film. 1
It may be about 0 μm.

As described above, when the functional fine particles such as the conductive fine particles are dispersed in a liquid, applied, and dried, a uniform film can be easily formed. When the dispersion of the fine particles is applied and dried, the fine particles form a film even when the binder is not present in the dispersion. Although the reason for forming a film without the presence of a binder is not always clear, fine particles gather together due to capillary force when the liquid is dried and the amount of liquid decreases. Furthermore, the fact that the particles are fine particles has a large specific surface area and a strong cohesive force, so it is thought that they may become a film. However, the strength of the film at this stage is weak. Further, the resistance value of the conductive film is high, and the variation in the resistance value is large.

Next, the formed layer containing functional fine particles such as the layer containing conductive fine particles is compressed to obtain a compressed layer of functional fine particles such as conductive fine particles. The compression improves the strength of the film. That is, by compressing, the number of contact points between functional fine particles such as conductive fine particles increases, and the contact surface increases. For this reason, the strength of the coating film increases. Since the fine particles originally have a property of easily aggregating, they become a strong film by being compressed.

In the conductive film, the strength of the coating film increases and the electrical resistance decreases. The catalyst film becomes a porous film because the strength of the coating film is increased and the resin is not used or the amount of the resin is small. Therefore, a higher catalytic function can be obtained. In other functional films, a high strength film in which fine particles are connected to each other can be obtained, and the amount of fine particles per unit volume increases because no resin is used or the amount of resin is small. Therefore, higher functions can be obtained.

The compression is preferably performed with a compression force of 44 N / mm ² or more. If the pressure is lower than 44 N / mm ² , the conductive fine particle-containing layer cannot be sufficiently compressed, and it is difficult to obtain a conductive film having excellent conductivity. 135N / mm ² or more compressive force and more preferably, compressive force of 180 N / mm ² is more preferable. The higher the compressive force, the higher the strength of the coating film and the better the adhesion to the support. In the conductive film, a film having more excellent conductivity is obtained, and the strength of the conductive film is improved,
The adhesion between the conductive film and the support is also enhanced. Since the higher the compression force, the higher the pressure resistance of the device must be increased, a compression force of up to 1000 N / mm ² is generally appropriate. Further, it is preferable that the compression is performed at a temperature near normal temperature (15 to 40 ° C.). The compression operation at a temperature near normal temperature is one of the advantages of the present invention.

The compression is not particularly limited, and can be performed by a sheet press, a roll press or the like, but is preferably performed by using a roll press machine. The roll press is a method of sandwiching a film to be compressed between rolls, compressing the roll, and rotating the roll. The roll press is preferably applied with a high pressure uniformly, and can be produced in a roll-to-roll manner, so that productivity is increased.

The roll temperature of the roll press is preferably room temperature. In a heated atmosphere or in a compression (hot press) in which a roll is heated, when the compression pressure is increased, a problem such as the resin film being elongated occurs. If the compression pressure is reduced to prevent the resin film of the support from stretching under heating, the mechanical strength of the coating film decreases. In a conductive film, the mechanical strength of the coating film decreases, and the electrical resistance increases.
If there is a reason to reduce the adhesion of moisture on the surface of the fine particles as much as possible, a heated atmosphere may be used to reduce the relative humidity of the atmosphere, but the temperature range is within the range where the film does not easily stretch. It is. Generally, the temperature is lower than the glass transition temperature (secondary transition temperature). The temperature may be set slightly higher than the temperature at which the required humidity is obtained in consideration of fluctuations in humidity. It is also preferable to adjust the temperature so that the roll temperature does not rise due to heat generation when continuously compressed by a roll press. The glass transition temperature of the resin film is determined by measuring dynamic viscoelasticity and refers to a temperature at which the mechanical loss of the main dispersion reaches a peak. For example, regarding a PET film, its glass transition temperature is around 110 ° C.

If the support is made of metal, the atmosphere can be heated up to a temperature range in which the metal does not melt. In addition, a high temperature treatment may be performed on a support having a certain degree of heat resistance, such as a metal or ceramic.

The roll of the roll press machine is preferably a metal roll because a strong pressure is applied. In addition, if the roll surface is soft, fine particles may be transferred to the roll during compression. Therefore, it is preferable to treat the roll surface with a hard film.

Thus, a compressed layer of functional fine particles such as conductive fine particles is formed. The thickness of the compressed layer of functional fine particles such as conductive fine particles depends on the application, but is preferably 0.1 to
It may be about 10 μm. Further, in order to obtain a compressed layer having a thickness of about 10 μm, a series of operations of coating, drying, and compressing a dispersion liquid of fine particles may be repeatedly performed. Further, in the present invention, it is of course possible to form each functional film such as a conductive film on both surfaces of the support. Each functional film such as a transparent conductive film obtained in this way exhibits excellent functionality such as excellent conductivity and catalytic action, and uses a small amount of resin that does not use a binder resin or does not function as a binder. Despite the use, the film has practically sufficient film strength and excellent adhesion to a support.

Next, an example in which the present invention is applied to a transparent conductive film will be described.

In the present invention, a liquid in which conductive fine particles are dispersed is used as a conductive paint. This conductive paint is applied on a support and dried to form a layer containing conductive fine particles. Thereafter, the layer containing the conductive fine particles is compressed to form a compressed layer of the conductive fine particles to obtain a conductive film. The conductive fine particles in the transparent conductive film are not particularly limited as long as they do not significantly impair the transparency of the conductive film, and inorganic conductive fine particles are used. Alternatively, organic conductive fine particles may be used.

In the present invention, “transparent” means that visible light is transmitted. Regarding the degree of light scattering, the required level differs depending on the use of the conductive film. In the present invention,
In general, there are scattering materials which are generally called translucent.

The inorganic conductive fine particles include tin oxide,
Indium oxide, zinc oxide, cadmium oxide, etc.
Fine particles such as antimony-doped tin oxide (ATO), fluorine-doped tin oxide (FTO), tin-doped indium oxide (ITO), and aluminum-doped zinc oxide (AZO) are preferred. Further, ITO is preferable in that more excellent conductivity can be obtained. Alternatively, a material in which an inorganic material such as ATO or ITO is coated on the surface of transparent fine particles such as barium sulfate can be used.

As the organic conductive fine particles, for example,
A material in which a metal material is coated on the surface of a resin fine particle is exemplified.

The functional film 102 of the present invention is formed on a support 101 as shown in FIG. 4, for example. In addition, as shown in FIG.
2b may be formed by stacking two or more layers.

Further, the functional film of the present invention is, for example, shown in FIG.
As shown in (1), a transfer type can be obtained by combining with the adhesive layer 104, the hard coat layer 103, and the like.
That is, the laminate shown in FIG. 6 includes a hard coat layer 103 and a functional film 10 on a support 101 such as a resin film.
2. The adhesive layer 104 and the separator 105 are sequentially laminated.

Then, as shown in FIG. 7, in a state where the laminate is inverted (a), the separator 105 is removed to expose the adhesive layer (b), and the laminate is adhered to the adherend 106 such as glass (FIG. 7). c). Finally, by removing the support 101, the functional film 2 protected by the hard coat layer 103 can be disposed on the adherend 106 (d).

Note that an adhesion layer may be provided between the functional film 102 and the hard coat layer, if necessary.

The hard coat layer is particularly effective for improving the scratch resistance of the functional film. The hard coat layer is not particularly limited as long as it can be formed on the functional film and has a predetermined strength, and a known hard coat material can be used. For example, a thermosetting hard coat agent such as a silicone-based, acrylic-based, or melamine-based can be used. Among them, the silicone hard coat agent is excellent in that a high altitude can be obtained.

Further, an ultraviolet curable hard coat agent such as a radical polymerizable hard coat agent such as an unsaturated polyester resin or an acrylic resin, or a cationic polymerizable hard coat agent such as an epoxy or vinyl ether may be used. The UV-curable hard coat agent is preferable from the viewpoint of productivity such as curing reactivity. Among these, an acrylic radical polymerizable hard coat agent is desirable in consideration of curing reactivity and surface hardness.

The hard coat layer can be formed by applying a solution obtained by dissolving a hard coat agent in a solvent, if necessary, on a functional thin film, drying and curing the solution.

The application of the hard coat agent may be performed by a known method such as a roll coater such as a gravure cylinder, a reverse or a Meyer bar, or a slit die coater.

After the application, the coating is dried in an appropriate temperature range and then cured. In the case of a thermosetting hard coat agent, appropriate heat is applied, and for example, in the case of a silicone-based hard coat agent, it is cured by heating to about 60 to 120 ° C. for 1 minute to 48 hours. Ultraviolet irradiation is performed using an ultraviolet irradiation source such as a xenon lamp, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a metal halide lamp, a carbon arc lamp, or a tungsten lamp, and the ultraviolet irradiation is performed for 200 to 200 hours.
It is preferable to irradiate about 0 mJ / cm ² .

The adhesive layer can be selected from known adhesive materials that can adhere the functional film and the adherend. Among these materials, a material having photocurability is particularly preferable. Specifically, rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl alcohol-based adhesives, polyvinylpyrrolidone-based adhesives, polyacrylamide-based adhesives, and cellulose-based adhesives Can be used. The thickness of the adhesive layer can be appropriately determined according to the necessary fixing force depending on the purpose of use. Preferably it is 1 to 500 μm, more preferably 100 μm or less, especially 5 to 50 μm.

The adhesion layer provided as required improves the adhesion and adhesion between the functional film and the hard coat layer. Usually, the hard coat layer has poor adhesion to the functional film,
Through the adhesion layer, it is possible to firmly adhere to the functional film. As the adhesion layer, a resin having good adhesion to the functional film and the hard coat layer can be used. Examples of the resin include acrylic, silicone, urethane, and vinyl chloride. Further, an ultraviolet absorber or an infrared absorber may be added to the adhesion layer. Furthermore, fine particles such as silica can be added as long as the adhesion is not affected.

Further, when minute irregularities are formed on the surface of the support on which the hard coat layer is formed, the irregularities are transferred to the hard coat layer, and the hard coat surface can be very easily subjected to an antiglare treatment. Can be. 4 and 5 described above.
May be further provided with a hard coat layer and an adhesion layer.

The functional film having such a structure, particularly in the case of a laminated structure as shown in FIG. 4, can be applied to a conductive material such as a touch panel and a planar heating element, or an electromagnetic wave shielding material such as an electromagnetic wave shield for a PDP. In the case of the laminated structure shown in FIG.
It can be applied to conductive materials such as electrodes for inorganic EL and electrodes for solar cells, etc.
Conductive materials such as glass and resin plate materials for antistatic (especially semiconductor clean room, building material windows, etc.), electromagnetic shielding for CRT,
The present invention can be applied to an electromagnetic wave shielding material such as an electromagnetic wave shielding material for a PDP and an infrared ray shielding material such as a material for a high heat insulating double glass (Low-E).

[0091]

EXAMPLES The present invention will be described more specifically with reference to the following examples, but the present invention is not limited to these examples.

Example 1 A having a primary particle size of 10 to 30 nm
TO fine particles (SN-100P: manufactured by Ishihara Sangyo Co., Ltd.) 10
300 parts by weight of ethanol was added to 0 parts by weight, and the medium was dispersed as zirconia beads using a dispersing machine. The obtained coating liquid was applied to an apparatus as shown in FIG.
Then, ultrasonic treatment was performed at an ultrasonic irradiation time t = 0.5 second and a processing flow rate (coating liquid flow rate) of 22 l / hour. The irradiated ultrasonic wave had an oscillation frequency of 20 kHz, an amplitude of 25 μm, and a pressure of 1.
5 kgf / cm ² (gauge pressure).

Next, the coating liquid subjected to the ultrasonic treatment was
It was applied on a PET film having a thickness of 0 μm using a bar coater, and dried by sending warm air at 50 ° C.

The obtained film is hereinafter referred to as an uncompressed ATO film. The thickness of the ATO-containing coating film was 1.7 μm.

First, a preliminary experiment for confirming the compression pressure was performed. Room temperature (23 ° C.) using a roll press equipped with a pair of 140 mm-diameter metal rolls (roll chrome plating is applied to the roll surface) without rotating the rolls and without heating the rolls. Compressed the ATO film before compression. At this time, the pressure per unit length in the film width direction was 1000 N / mm. Next, the pressure was released, and the length of the compressed portion in the longitudinal direction of the film was 2 mm. from this result,
This means that compression was performed at a pressure of 500 N / mm ² per unit area.

Next, the same ATO film before compression as that used in the preliminary experiment was sandwiched between metal rolls and compressed under the above conditions, and the rolls were rotated and compressed at a feed speed of 5 m / min. Thus, a compressed ATO film was obtained. The thickness of the ATO coating film after compression was 1.0 μm.

(Electrical Resistance) The film on which the conductive film was formed was cut into a size of 50 mm × 50 mm. A tester was applied to two diagonal corners to measure the electric resistance, and it was 61 kΩ.

(90 degree peel test) To evaluate the adhesion of the conductive film to the support film and the strength of the conductive film,
A peel test was performed. This will be described with reference to FIG. In the test sample (1) on which the conductive film was formed, a double-sided tape (2) was attached to the surface of the support film (1b) opposite to the surface on which the conductive film (1a) was formed. This is 25mm x 100mm
Cut out. The test sample (1) was stuck on a stainless steel plate (3). Cellophane tape (4) was attached to both ends (25 mm side) of sample (1) so that test sample (1) did not peel off. (FIG. 8 (a)).

A cellophane tape (width 12 mm, manufactured by Nitto Denko No. 29) (5) was applied to the conductive film (1a) surface of the test sample (1) so as to be parallel to the long side of the sample (1). The sticking length between the cellophane tape (5) and the sample (1) was 50 mm. Attach the end of the cellophane tape (5) where the
(6), and set so that the angle between the sticking surface of the cellophane tape (5) and the non-sticking surface (5a) was 90 degrees. The cellophane tape (5) was pulled off at a speed of 100 mm / min. At this time, the speed at which the tape (5) was peeled off and the stainless steel plate (3) on which the test sample (1) was adhered were moved at the same speed, and the non-stick surface (5a) of the cellophane tape (5) and the test sample (1) were moved. ) Plane was always 90 degrees. The force (F) required for peeling was measured by a tensiometer (6).
(FIG. 8 (b)).

After the test, the peeled conductive film surface and the cellophane tape surface were examined. When the adhesive is present on both surfaces, the conductive layer was not destroyed, but the adhesive layer of the cellophane tape was destroyed, that is, the force (F) required for peeling off the adhesive strength Therefore, the strength of the conductive coating film is equal to or more than the value (F).

In this test, the upper limit of the strength of the adhesive was 6
Since it is N / 12 mm, what is indicated as 6N / 12 mm in Table 1 is a case where the adhesive is present on both surfaces as described above, and the adhesion and the strength of the conductive film are 6 N / 12 mm or more. It represents that. If the value is smaller than this, it means that there is no adhesive on the surface of the conductive film and the conductive film is partially adhered to the surface of the cellophane tape.

As a result of the 90-degree peel test, in Example 1, a force of 6 N / 12 mm was required to peel off the cellophane tape. When the coating film surface after the peel test was examined, the adhesive of the cellophane tape was adhered. When the adhesive surface of the peeled cellophane tape was examined, it was found to be adhesive. Therefore, the strength of the coating film was 6 N / 12 mm or more.

Example 2 A preliminary experiment was performed in the same manner as in Example 1 except that the pressure per unit length in the film width direction was changed to 660 N / mm and compression was performed. ATO film was obtained. In a preliminary experiment, the pressure was released without rotating the roll press under compression, and the length of the compressed portion in the longitudinal direction of the film was measured to be 1.9 mm. The pressure was 347 N / mm ² . In the following examples, the pressure per unit area was calculated in the same manner. The thickness of the ATO coating film after compression was 1.0 μm. The pre-compression ATO film used was the same as that prepared in Example 1, and the following Examples 3 to
6, the same applies to Comparative Example 1.

The electric resistance of the compressed ATO film is 7
It was 5 kΩ. As a result of the 90 degree peel test, a force of 6 N / 12 mm was required to peel off the cellophane tape. When the coating film surface after the peel test was examined, the adhesive of the cellophane tape was adhered. When the adhesive surface of the peeled cellophane tape was examined, it was found to be adhesive. Therefore, the strength of the coating film was 6 N / 12 mm or more.

Reference Example 1 In Example 1, no ultrasonic treatment was performed. A physical property test was performed on the obtained ATO film. The electric resistance of the ATO film not subjected to the ultrasonic treatment was 65 kΩ. As a result of the 90 degree peel test, a force of 6 N / 12 mm was required to peel off the cellophane tape.

[0106]

[Table 1]

Example 3 I having a primary particle size of 10 to 30 nm
300 parts by weight of ethanol was added to 100 parts by weight of TO fine particles (manufactured by Dowa Mining Co., Ltd.), and the medium was dispersed as zirconia beads using a dispersing machine.

The obtained coating solution was subjected to ultrasonic treatment in the same manner as in Example 1, and then applied to a 50 μm-thick PET film using a bar coater, and dried by blowing warm air at 50 ° C. The obtained film is hereinafter referred to as ITO before compression.
Called film. The thickness of the ITO-containing coating film is 1.7 μm
Met.

In the same manner as in Example 1, using a roll press, the ITO film before compression was pressed at a pressure of 1000 N / mm per unit length in the film width direction, a pressure of 500 N / mm ² per unit area, and 5 m / m2. Compress at a feed rate of minutes,
A compressed ITO film was obtained. The thickness of the ITO coating film after compression was 1.0 μm. The electrical resistance of the compressed ITO film was 2 kΩ. From the results of the 90 degree peel test, the strength of the coating film was 6 N / 12 mm or more.

Reference Example 2 In Example 3, no ultrasonic treatment was performed. A physical property test was performed on the obtained ITO film in the same manner as in Example 1. The electrical resistance of the ITO film not subjected to the ultrasonic treatment was 4 kΩ. 90
6N to peel off cellophane tape as a result of degree peel test
A force of / 12 mm was required.

Example 4 In Examples 1 to 3, ultrasonic treatment was performed after coating. That is, the coating liquid in which the functional fine particles are dispersed is applied on a PET film having a thickness of 50 μm using a bar coater, and subjected to ultrasonic treatment using an apparatus as shown in FIGS. It was dried by blowing air. Otherwise, a film having a functional film was obtained in the same manner as in Examples 1 to 3. The ultrasonic vibration plate has a thickness of 1 m.
A duralumin plate of m, width of 100 mm and length of 350 mm was used, a 20 kHz π-type ferrite vibrator was used as an ultrasonic generator, and 50 W was applied as a high frequency electric input to the vibrator.

When the obtained film was evaluated in the same manner as in Examples 1 to 3, almost the same results were obtained.

Example 5 In Examples 1 to 3, the same ultrasonic treatment as in Example 4 was performed after coating.

When the obtained film was evaluated in the same manner as in Examples 1 to 3, it was found that particularly excellent effects were obtained.

[0115]

As described above, according to the present invention, it is possible to provide a method for producing a functional film capable of exhibiting various functions by a coating method, and a functional film.

In particular, it is possible to provide a method for producing a transparent conductive film having a low resistance value by a coating method, and a transparent conductive film. Further, a method for producing a transparent conductive film, which can form a film without requiring a high-temperature heating operation, and can provide a uniform film with uniform thickness, and a transparent conductive film can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing one example of an ultrasonic treatment apparatus used in a method for producing a functional film of the present invention.

FIG. 2 is a schematic plan view showing an example of another ultrasonic processing apparatus used in the method for producing a functional film of the present invention.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a schematic sectional view showing a first configuration example of a composite film having a functional film of the present invention.

FIG. 5 is a schematic cross-sectional view showing a second configuration example of the composite film having the functional film of the present invention.

FIG. 6 is a schematic sectional view showing a third configuration example of the composite film having the functional film of the present invention.

FIG. 7 is a schematic sectional view showing a transfer step of the transfer type composite film shown in FIG.

FIG. 8 is a diagram for explaining a 90-degree peel test in an example.

[Explanation of symbols]

 2 Stirring tank 3 Functional fine particle dispersion (paint) 4 Pump 10 Ultrasonic treatment device 11 Test sample with conductive film formed 11a Conductive film 11b Support film 12 Double-sided tape 13 Stainless steel plate 14 Cellophane tape for fixing 15 Cellophane tape 15a Cellophane tape non-sticking surface 16 Tensiometer 20 Ultrasonic treatment tank 21 Coating layer 22 Support body 23 Ultrasonic vibration generator 24 Amplitude amplification horn 25 Flexural diaphragm 30 Ultrasonic horn 40 Ultrasonic transducer 41 Amplitude detector 42 Amplitude display Reference Signs List 101 support 102 functional film 103 hard coat layer 104 adhesive layer 105 separator 106 adherend

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // G02F 1/1343 G02F 1/1343 (72) Inventor Masahide Kono 1-13-1 Nihombashi, Chuo-ku, Tokyo No. F-term in TDK Corporation (reference) 2H092 GA62 GA64 HA04 MA10 MA31 NA18 NA27 4D075 BB05Z BB13X BB13Z CA22 DA06 DB31 DC24 EC02 4F100 AA25B AA28B AA33B AK01A AK42 AT00 BA02 BA07 DE01B EH462EJBJBJJJBJJBJJBJJBJJBJJBJ JN06B JN30B YY00 5G323 BA02 BB01 BC03

Claims (12)

[Claims] 1. A liquid in which functional fine particles are dispersed is coated on a support and dried to form a functional fine particle-containing layer. Thereafter, the functional fine particle-containing layer is compressed to form a compressed layer of functional fine particles. A method for producing a functional film, comprising: a step of forming, and a step of performing ultrasonic treatment on a liquid in which functional fine particles are dispersed at least before or after the applying step. 2. The method for producing a functional film according to claim 1, wherein the ultrasonic treatment is performed on a liquid in which functional fine particles are dispersed before coating. 3. The method for producing a functional film according to claim 1, wherein the ultrasonic treatment is performed on a liquid in which functional fine particles are dispersed after coating. 4. The ultrasonic processing according to claim 1, wherein the oscillating frequency is 10 kHz.
The method for producing a functional film according to claim 1, wherein the method is performed under operating conditions of z to 200 kHz and an ultrasonic amplitude of 10 to 100 μm. 5. Compress with a compression force of 44 N / mm ² or more.
A method for producing a functional film according to claim 1. 6. The method for producing a functional film according to claim 1, wherein the compression is performed at room temperature. 7. The method for producing a functional film according to claim 1, wherein the compression is performed using a roll press. 8. The method for producing a functional film according to claim 1, wherein the functional fine particles are conductive fine particles and have a function as a conductive film. 9. The method according to claim 1, wherein the conductive fine particles are tin oxide, indium oxide, zinc oxide, cadmium oxide, antimony-doped tin oxide (ATO), fluorine-doped tin oxide (FTO), tin-doped indium oxide (ITO), and aluminum-doped oxide. The method for producing a functional film according to claim 8, wherein the method is a conductive inorganic fine particle selected from zinc (AZO). 10. The support according to claim 1, wherein the support is a resin.
The method for producing a functional film according to any one of the above. 11. A functional film produced by the method according to claim 1. 12. The functional film includes a conductive film, a magnetic film, a ferromagnetic film, a dielectric film, a ferroelectric film, an electrochromic film, an electroluminescent film, an insulating film, a light absorbing film,
The functional film according to claim 11, which is selected from a light selective absorption film, a reflection film, an antireflection film, a catalyst film, and a photocatalyst film.