JP2002337277A - Front panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front panel having good scratch resistance, good in all of antibacterial properties, light fastness and appearance suitable for a front panel for display or a front panel for a touch panel of an optical (infrared) system, a resistance film system, an electromagnetic induction system or the like. SOLUTION: The front panel comprises a scratch-resistant film containing an antibacterial agent comprising a phosphate double salt containing silver and a substrate and the surface of the scratch-resistant film has reflection preventing properties. The front panel for display comprising the front panel and the front panel for the touch panel comprising the front panel are also disclosed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front plate having an abrasion-resistant film on its surface and containing an antibacterial agent comprising a double phosphoric acid salt containing silver in the film.

[0002]

2. Description of the Related Art With the recent trend toward cleanliness, it is desired that devices and products installed in places used by many people have a function of controlling bacteria and fungi. In particular, antibacterial measures are required for devices and products used by an unspecified number of people, such as station ticket vending machines, touch panels such as cash dispensers, various video display devices and front panels of displays, and liquid crystal display units of mobile phones. Thus, resin compositions and resin molded articles having an antibacterial action are being used.

[0003] Antibacterial agents used in antibacterial resin compositions and resin molded articles are roughly classified into organic antibacterial agents and inorganic antibacterial agents. Examples of organic antibacterial agents include, for example, JP-A-51-15
As disclosed in Japanese Patent No. 1740, among organic compounds conventionally known as disinfectants, they do not decompose in a heating step when producing a resin composition or a resin molded article, and have a long term after production. Organic compounds having antibacterial properties have been used. In particular, a technique of immobilizing quaternary ammonium having a bactericidal action in the form of phosphate and using it as a highly active organic antibacterial component is disclosed in JP-A-6-256563 and JP-A-9-291188. Have been.
Further, Japanese Patent Application Laid-Open No. 9-157548 discloses a technique for producing an antibacterial article by coating the surface of an acrylic resin with a coating agent containing a quaternary ammonium phosphate. However, recently, in a heating step for producing a resin composition or a resin molded article, an inorganic antibacterial agent having higher heat resistance tends to be frequently used.
As an inorganic antibacterial agent, a ceramic type in which a metal having an antibacterial action is held in zeolite, apatite, alumina, silica gel, or the like is generally used, and silver having both high antibacterial properties and safety is frequently used as a metal. . For example, JP-A-59-133235 discloses that a zeolite holding silver is added to a resin as an antibacterial agent. Also, Japanese Patent Application Laid-Open No. 8-73633 discloses an antibacterial resin sheet containing an inorganic antibacterial agent.

[0004]

However, in the antibacterial resin composition containing a conventional inorganic antibacterial agent carrying silver, there is a possibility that the antibacterial agent may cause poor dispersion in the resin. That is, as compared with an organic antibacterial agent that is compatible with a resin at a molecular level, an inorganic antibacterial agent is more likely to aggregate or settle in a resin. For this reason, conventional inorganic antibacterial agents may cause problems such as poor dispersion, insufficient antibacterial properties, poor appearance after shaping, and poor transparency. In particular, it has been difficult to use it for a front plate for a display, a front plate for a touch panel, and the like of an image device, a video display device, and the like in which appearance and transparency are regarded as important.

When an inorganic antibacterial agent having silver supported on zeolite or silica gel is used, the elution of silver ions due to moisture in the air during long-term use is likely to occur because zeolite or silica gel itself has a hygroscopic property. There are also problems such as reduction of silver ions by light to form silver colloids (metallic silver) and coloring, and reduction of antibacterial properties. Furthermore, when the antimicrobial agent is concentrated on the surface layer, the surface layer absorbs water, and warpage may occur during long-term use.

[0006]

The gist of the present invention resides in a front plate comprising a scratch-resistant coating containing an antibacterial agent comprising a double phosphoric acid salt containing silver and a substrate.

[0007] The gist of the present invention resides in the above-mentioned front plate in which the surface of the scratch-resistant film has antireflection properties.

Further, the gist of the present invention resides in a front plate for a display and a front plate for a touch panel comprising the above-mentioned front plate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The antibacterial agent used in the present invention is a double phosphoric acid salt containing silver. Examples of the phosphoric acid double salt for immobilizing silver include those containing aluminum phosphate, zirconium phosphate, and titanium phosphate, and have a high silver immobilizing ability and are favorable in the double salt production process. Precipitating aluminum phosphate is preferred. That is, in the present invention, the phosphoric acid double salt preferably contains silver ions and ions containing aluminum phosphate. In the present invention, the average ratio of silver to the antibacterial agent, which is an index of the amount of silver immobilized, is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and 0.1% by mass or more.
5% by mass or more is more preferable, 20% by mass or less is preferable, 15% by mass or less is more preferable, and 10% by mass or less is further preferable. If the amount of fixed silver is too small, a sufficient antibacterial effect may not be obtained. If the amount is too large, production of an antibacterial agent may be difficult. When the phosphate double salt is composed of silver ions and ions containing aluminum phosphate, a preferable amount of immobilized silver can be realized.

In the present invention, the ion containing aluminum phosphate is preferably an aluminum zinc phosphate cation. Zinc is a metal having antibacterial activity like silver, but its activity is inferior to silver. However, zinc is not easily reduced like silver and causes coloring. By introducing zinc into ions containing aluminum phosphate, an antibacterial agent comprising a silver phosphate double salt that has been further activated can be obtained without lowering the light resistance or increasing the price. When zinc is introduced, the bactericidal effect is supplemented, so that the amount of the antibacterial agent added to the scratch-resistant film can be reduced, and the light resistance and the like are improved.

In the phosphoric acid double salt of the present invention, besides aluminum and zinc, alkali metal ions, alkaline earth metal ions, or quaternary ammonium ions may be used because the ion exchange method can be used in the production process. May be included. Among them, alkaline earth metal ions having high ion exchange capacity, particularly calcium ions, are preferred. That is, in the present invention, the cation of the aluminum zinc phosphate cation is preferably a calcium ion.

As having all of the preferable effects described above, the general formula (1)

Embedded image (Where α, β and γ are 0 <α <9, 0 <β <9,
0 <γ <5 and 2α + 2β + 3γ = 17 are satisfied). The silver-aluminum zinc calcium phosphate may be a mixture of different α, β, or γ.

[0013] Antibacterial agents comprising this silver-aluminum zinc calcium phosphate include antibacterial sera coats C715S, C91, P01 manufactured by Shinto V Celax Co., Ltd.
1 and the like.

The content of the antibacterial agent in the present invention is preferably 0.01% by mass to 10% by mass, more preferably 0.1% by mass to 5% by mass in the scratch-resistant film. If the content is too large, physical properties such as scratch resistance and transparency of the scratch-resistant film may be deteriorated or the appearance may be deteriorated. If the content is too small, sufficient antibacterial performance may not be obtained.

The average particle size of the antibacterial agent used in the present invention is as follows:
It is preferably 5 μm or less, more preferably 2 μm or less.
μm or less, most preferably 1.5 μm or less. When the average particle size is 5 μm or less, the antibacterial agent can be sufficiently dispersed in the scratch-resistant film.

The scratch-resistant film constituting the front plate of the present invention is preferably made of a resin. The resin is preferably composed of a polyfunctional monomer unit in order to improve the scratch resistance of the film. Examples of the polyfunctional monomer include polyethylene glycol di (meth) acrylate such as diethylene glycol di (meth) acrylate and triethylene glycol di (meth) acrylate, and 1,4-butanediol di (meth).
Examples include acrylate, 1,6-hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, and dipentaerythritol hexaacrylate. Further, a saturated or unsaturated polyester poly (meth) acrylate composed of a condensate formed by a combination of malonic acid / trimethylolethane / (meth) acrylic acid, succinic acid / trimethylolethane / (meth) acrylic acid, and the like are also included. Of these, polyfunctional (meth) acrylates are particularly preferred. According to the purpose, it is also possible to combine a plurality of polyfunctional monomers.

The base material constituting the front plate of the present invention is preferably made of a resin. The resin is not particularly limited, for example, in the case of a thermoplastic resin, polyethylene, polypropylene,
Polystyrene, ABS resin, polyvinyl chloride, polyamide, polyester, polyvinyl alcohol, polycarbonate resin, polyacetal, acrylic resin, fluorine resin, polyurethane elastomer, polyester elastomer, etc. can be used. Resins and polycarbonate resins are preferred. Acrylic resin is most preferred in terms of transparency, hardness and the like.

As the thermosetting resin, epoxy resin, unsaturated polyester resin, phenol resin, melamine resin, polyurethane resin, silicone resin and the like can be used.

Depending on the purpose, various additives such as glass fibers, antioxidants, release agents, inorganic fillers, fatty acid ester waxes, polyethylene waxes, antistatic agents, ultraviolet absorbers may be added to the resin serving as the base material. Agents, organic pigments, inorganic pigments and the like can be added.

The method for coating the scratch-resistant film used in the present invention is not particularly limited. For example, a scratch-resistant coating material is prepared by mixing necessary amounts of the above-mentioned polyfunctional monomer, antibacterial agent, polymerization initiator and the like, and the prepared material is sprayed or applied to the surface of the substrate, and then subjected to thermal polymerization by heating. And a method in which photopolymerization is promoted by irradiation with active energy rays such as ultraviolet rays and electron beams, and polymerization and curing are performed to form a film. At this time, the scratch-resistant coating material may be diluted with a solvent or the like in order to improve the coatability or adjust the film thickness. In addition, a method of performing injection molding of a thermoplastic resin after curing and forming a scratch-resistant film on the mold surface, and manufacturing a casting cell from a glass plate or metal plate with a hardened scratch-resistant film on the surface Then, casting polymerization is performed to transfer the scratch-resistant film to the resin surface.

As an example of a measure of scratch resistance, JIS
Surface hardness determined by a pencil scratch test according to K 5400. That is, the surface hardness of a normal acrylic resin and a polycarbonate resin whose surfaces are not coated with a scratch-resistant film are 2H and 4B, respectively.
On the other hand, by coating these resins with the abrasion-resistant film of the present invention, the surface hardness of each can be improved to 3H or more and B or more.

The scratch-resistant film may further contain colloidal silica or the like to further improve the scratch resistance.

Various additives such as glass fibers, antioxidants, release agents, inorganic fillers, and fatty acids may be added to the scratch-resistant film of the present invention, if necessary, as long as the scratch resistance is not impaired. An ester wax, a polyethylene wax, an antistatic agent, an ultraviolet absorber, an organic pigment, and an inorganic pigment can be added.

The thickness of the scratch-resistant film is preferably 0.5 to 50 μm, more preferably 1 to 30 μm. If the film thickness is too small, the scratch resistance may be insufficient. If the film thickness is too large, the film may crack or the film may peel off from the substrate.

The surface of the scratch-resistant coating constituting the front plate of the present invention preferably has antireflection properties. The method for imparting the antireflection property is not particularly limited. As an example, a method of performing a roughening treatment (hereinafter, referred to as “non-glare treatment”) by giving fine irregularities to the surface of the scratch-resistant film, and a material constituting the scratch-resistant film on the cured scratch-resistant film surface For example, a method of forming a multilayer coating of materials having different refractive indices may be used.
Examples of the method for obtaining a non-glare-treated scratch-resistant film include a method of previously performing a non-glare treatment on a mold surface used in the above-described method of coating the scratch-resistant film and a surface of a glass plate or a metal plate, To which inorganic fine particles or organic crosslinked particles are added. The degree of non-glare can be adjusted according to the distance between the front plate of the present invention and a display or the like provided with the front plate.

The front plate comprising the scratch-resistant film of the present invention and a substrate is a front plate for various display objects; a liquid crystal display device used for various video / moving image display devices, portable information terminal devices, etc.
Front panels for displays such as plasma display devices, EL display devices, and CRT display devices; display devices and input switches used for various video / video display devices such as cash dispensers and various ticket vending machines, portable information terminal devices, and the like. It is suitable for an integrated front panel for a touch panel and the like.

Examples of the touch panel include an ultrasonic type, a capacitance type, a light (infrared) type, a resistive type, and an electromagnetic induction type. For example, as a resistive film method, a substrate and an upper electrode plate having an electrode layer formed on the lower surface thereof, and a substrate and a lower electrode plate having an electrode layer formed on the upper surface thereof are separated by a predetermined distance by a spacer. Electrode layers arranged so that the electrode layers face each other. Usually, a display device is provided below the lower electrode plate to form a touch panel. In this touch panel, when the upper surface of the substrate of the upper electrode plate is pressed with a finger or an input pen, the upper electrode plate bends and the electrode layers of the upper electrode plate and the lower electrode plate come into contact. The coordinates of the contact portion are detected by measuring the electric resistance, and the input information is read.

In such a touch panel, the upper substrate is often pressed with a finger, an input pen, or the like, and therefore is required to have abrasion resistance and antibacterial properties. In addition, the screen of the touch panel is easy to see with little reflection of lighting etc.,
It is also required that fingerprints be inconspicuous. The front plate comprising the scratch-resistant film and the base material of the present invention is suitable for a front plate serving as an upper substrate in a touch panel.

As in the case of the resistive touch panel, the front plate of the present invention is also used for the ultrasonic, capacitive, optical (infrared) and electromagnetic induction type touch panels. It is suitable for.

[0030]

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

As test bacteria, Staphylococcus aureus (IFO12)
732) and Escherichia coli (IFO3972), a test method for evaluating antibacterial performance will be described below.

(1) Culture of Test Bacteria The test bacteria were transferred to a normal agar (NA) medium, and the temperature was 37 ± 1.
The bacterium cultured at 16 ° C. for 16 to 24 hours (pre-pre-culture) was further transplanted with one platinum loop into NA medium, and then cultured at 37 ± 1 ° C. for 16 to
The cells were cultured for 4 hours (pre-culture).

(2) Preparation of Bacterial Solution for Inoculation A normal broth medium containing 0.2% meat extract was diluted 500-fold with a phosphate buffer, and the pre-cultured bacteria were uniformly dispersed. did.

(3) Test operation and evaluation method 0.4 ml (1.0 × 10 ⁵ -5.
0 × 10 ⁵ bacteria) and 40 × 40
After covering with a covering film (reinforced polyethylene) cut into mm, and covering the lid, it was stored under conditions of a temperature of 35 ± 1 ° C. and a relative humidity of 90% or more. After 24 hours, the SCDLP medium was added to 10
Then, 1 ml was taken out, and 1 ml was taken out. The number of surviving bacteria was measured by a pour plate method using a standard agar medium, and converted into the number of surviving bacteria per test piece.

Example 1 50 parts by mass of 1,6-hexanediol diacrylate, 50 parts by mass of a condensation reaction mixture of trimethylolethane, acrylic acid and succinic acid, α = 3 in the general formula (1), 0.25 parts by mass of an antibacterial agent satisfying β = 4 and γ = 1 and 1.5 parts by mass of bezoin ethyl ether were stirred for 30 minutes to obtain a coating material having antibacterial properties and scratch resistance. In this case, since the change in the mass of the coating material in the subsequent photo-curing step can be ignored, 0.246% by mass of the antibacterial agent is added to the entire coating.

The coating material is dropped on a surface of a tempered glass having a thickness of 0.6 cm, a length of 60 cm, and a width of 40 cm, which has been washed in advance, covered with a PET film, and uniformly spread over the PET film with a rubber roller. Was. Then, P
Preliminary light curing by UV irradiation from the ET film,
Further, the PET film was removed, UV irradiation was performed, and the film was further light-cured, thereby producing a scratch-resistant film having antibacterial properties on the tempered glass. Similarly, a scratch-resistant film having antibacterial properties was formed on the surface of another tempered glass of the same size. The surface on which the two sheets of tempered glass were formed was turned inside, and the periphery was sealed with a gasket made of vinyl chloride to produce a polymerization cell.

Next, methyl methacrylate (hereinafter referred to as "M
MA ") and a mixture of MMA and syrup (polymerization rate 20%, viscosity about 1000 cps / 23 ° C) 1
To 00 parts by mass, 0.32 parts by mass of tertiary hexyl peroxypivalate (perhexyl PV; manufactured by NOF Corporation) was added as a polymerization initiator and mixed. After the mixture was defoamed with a suction bottle, it was poured into the above-mentioned polymerization cell. The injected cell was heated in a water bath at 76 ° C. for 1 hour, and then heat-treated in an air furnace at 130 ° C. for 1 hour to polymerize the mixed solution to obtain a resin plate. After the polymerization is completed, the resin plate is peeled off from the tempered glass, and is composed of a scratch-resistant film and a substrate on both surfaces,
A resin plate having a thickness of 1 mm was obtained. Scratch resistant film thickness is 22
μm. When a pencil scratch test was performed in accordance with JIS K 5400, the surface hardness was 6H,
The scratch resistance was good. Appearance and transparency were also good. Further, no molding defects such as foaming were confirmed in any of the above steps, and no phenomenon such as clouding or coloring of the scratch-resistant film was observed even after exposure to room light for 3 months.

A small piece of 5 cm square was cut out from this resin plate and its antibacterial performance was measured. As a result, it was found that the resin had antibacterial performance (see Table 1). Further, the resin plate is heated at 80 ° C. for 1
After aseptically immersing in hot water for 20 hours in water, the antibacterial performance of the resin plate was measured, and it was found that the antibacterial performance was maintained. As a control experiment to assure that the growth conditions of the cells were appropriate, a commercially available double-sided acrylic resin surface-hardened plate (Acrylite MR200 manufactured by Mitsubishi Rayon Co., Ltd., to which no antibacterial property was imparted) was used. 1mm thick)
Was used to evaluate the antibacterial performance in parallel. Table 1 shows the results
Shown in

[0039]

[Table 1] As described above, the resin plate composed of the scratch-resistant film and the substrate obtained in the present example has a sufficient antimicrobial activity continuously maintained, and has good light resistance and appearance. I understood.

A resin plate having both antibacterial properties and abrasion resistance was cut into a size suitable for a commercially available video display (screen size: 15 inches), and set as a front plate on the front surface of the commercially available video display. This front plate was excellent in transmittance, had a bright image, had no scratches even when the surface was wiped dry with a commercially available cloth, and was excellent as a front plate.

Example 2 As an antibacterial agent containing silver-aluminum zinc calcium phosphate, an antibacterial sera coat C715S manufactured by SHINTO V CELLAX CO., LTD. (Average ratio of silver to antibacterial agent is 1% by mass. %, The average particle size of the antibacterial agent is 1
μm) 0.5 parts by mass (0.49% by mass with respect to the film)
A resin plate comprising a scratch-resistant film on both surfaces and a base material was obtained in the same manner as in Example 1 except for using. The thickness of the film was 25 μm, the surface hardness was 6H, the scratch resistance was good, and the appearance and transparency were good. Also, no molding defects such as foaming were confirmed in any of the above steps,
Even after exposure to room light for 3 months, no phenomenon such as clouding or coloring of the film was observed. Further, when the performance was measured in the same manner as in Example 1 (see Table 1), it was found that there was sufficient antibacterial performance, and that the maintenance of the antibacterial performance, the abrasion resistance and the light resistance were also good.

A resin plate having both antibacterial properties and scratch resistance was set as a front plate on the front of a commercially available video display in the same manner as in Example 1. This front plate was excellent in transmittance, had a bright image, had no scratches even when the surface was wiped dry with a commercially available cloth, and was excellent as a front plate.

Example 3 A glass plate having a non-glare treated surface was used as one glass, and a scratch-resistant coating material was dropped on the non-glare treated surface in the same manner as in Example 2, except that a glass plate was used. A resin plate comprising a scratch-resistant film on the surface and a substrate, and one of the films having an antireflection property was obtained. The thickness of the film was 25 μm, the surface hardness was 6H, the scratch resistance was good, and the appearance, transparency, and antireflection were good. In addition, no molding defects such as foaming were observed in any of the above steps, and no phenomenon such as clouding or coloring of the film was observed even after exposure to room light for 3 months. Further, the performance was measured in the same manner as in Example 1 (Table 1).
), Sufficient antibacterial performance, and good retention of antibacterial performance, abrasion resistance and light resistance.

A resin plate having both antibacterial properties and abrasion resistance is cut into a size suitable for a commercially available video display (screen size: 15 inches), and a non-glare treatment is applied to the front of the commercially available video display as a front plate. It was set so that the surface side, that is, the coating having antireflection properties was on the observer side. This front panel has excellent transmittance, bright image,
The reflection of external light such as illumination was small, and the image was easy to see. Further, even if the surface was wiped dry with a commercially available cloth, no damage was found, and it was excellent as a front plate.

(Comparative Example 1) A resin plate having an antibacterial scratch-resistant film transferred to both surfaces was prepared in the same manner as in Example 1 except that zeolite holding silver was used as an antibacterial agent. Obtained. The obtained resin plate was slightly cloudy, and the appearance was poor due to bumps due to aggregation of the antibacterial agent. Further, when the resin plate was exposed to room light for 3 months, the film was colored. When the antibacterial performance was measured in the same manner as in Example 1,
It was found that the antibacterial performance was low (see Table 1). As described above, the antibacterial properties, light resistance, and appearance of the resin plate obtained in the present comparative example are lower than those of the resin plate composed of the scratch-resistant film having the antibacterial property obtained in the above example and the substrate. I understand.

Example 4 30 parts by weight of 1,6-hexanediol diacrylate, 40 parts by weight of a condensation reaction mixture of trimethylolethane, acrylic acid and succinic acid, and 30 parts by weight of dipentaerythryl hexaacrylate And an antibacterial agent containing silver-aluminum zinc calcium as antibacterial agent, an antibacterial sera coat C715S manufactured by SHINTO V CELLAX CO., LTD. 0.5 parts by mass of an average particle size of 1 μm) and 2,4,6-trimethylbenzoyldiphenylphosphine oxide (trade name Luciri, manufactured by BASF)
(nTPO) 2.0 parts by mass was stirred for 30 minutes to obtain a scratch-resistant coating material having antibacterial properties and scratch resistance. In this case, since the change in the mass of the coating material in the subsequent photo-curing step can be neglected, the antibacterial agent is added to the entire coating in an amount of 0.48% by mass.

Non-glare-treated surface with a thickness of 0.6
After dripping the coating material on the surface of glass having a length of 60 cm and a length of 40 cm, a commercially available acrylic resin single-sided surface hardened plate (Acrylite MR100, manufactured by Mitsubishi Rayon Co., Ltd., thickness 1 mm, length 60 cm, width 40 cm) Next, the uncured surface was covered with the coating material side, and then pressed with a press roll from the cured surface side of the acrylic resin plate to uniformly spread the coating material to a thickness of 20 μm. From the glass side that has been subjected to non-glare treatment, heat it with an infrared heater and hold it at a glass surface temperature of 65 ° C for 15 minutes to preliminarily cure the coating material. Then, a metal halide lamp having an output of 120 W / cm was installed at a height of 210 mm from the non-glare-treated glass side. Metal halide lamp lighting under the upper surface of the glass that is non-glare treatment, 0.3 m / m
The film was hardened by passing through the acrylic resin plate at an in speed.

Thereafter, the glass subjected to the non-glare treatment and the tempered glass for holding were peeled off to obtain a resin plate comprising a scratch-resistant film having antibacterial properties and antireflection properties and a substrate. The thickness of the film was 22 μm, the surface hardness was 6H, the scratch resistance was good, and the appearance, transparency, and antireflection were good. In addition, no molding failure such as foaming was confirmed in any of the above steps, and even when exposed to room light for three months,
No phenomenon such as clouding or coloring of the film was observed. Further, when the performance was measured in the same manner as in Example 1 (see Table 2), it was found that there was sufficient antibacterial performance, and that the maintenance of the antibacterial performance, the abrasion resistance and the light resistance were also good.

In the same manner as in Example 3, a resin plate having both antibacterial properties and scratch resistance was coated on the front surface of a commercially available video display with a non-glare-treated surface, that is, a film having antireflection properties. It was set to be on the observer side.
This front plate had excellent transmittance, a bright image, little reflection of external light such as illumination, and the image was easy to see. Moreover, even if the surface was wiped dry with a commercially available cloth, it was not damaged and was excellent as a front plate and a protective plate.

[0050]

[Table 2] Example 5 An antibacterial agent comprising 50 parts by mass of 1,6-hexanediol diacrylate, 50 parts by mass of a condensation reaction mixture of trimethylolethane, acrylic acid and succinic acid, and silver-zinc calcium aluminum phosphate As antibacterial sera coat C715S manufactured by Shinto V Celax Co., Ltd.
(Average ratio of silver in the antibacterial agent is 1% by mass, average particle size of the antibacterial agent is 1 μm) 0.5 part by mass and 2,4,6-trimethylbenzoyldiphenylphosphine oxide (B
2.8 parts by mass of Lucirin TPO (trade name, manufactured by ASF) and 1 part by mass of benzophenone (manufactured by Wako Pure Chemical Industries, Ltd.) were stirred for 30 minutes to obtain a coating material having antibacterial properties and scratch resistance. In this case, since the change in the mass of the coating material in the subsequent photo-curing step can be neglected, the antibacterial agent is added to the entire coating in an amount of 0.48% by mass.

The obtained scratch-resistant film raw material is
m, a length of 600 mm, and a width of 400 mm on a commercially available polycarbonate resin plate (available from Mitsubishi Engineering-Plastics Co., Ltd., trade name: Iupilon).
The coating was performed at 0 ° C. Then, a thickness of 50
A biaxially stretched PET film of μm was covered, and the thickness of the coating layer was adjusted to 8 μm using a rubber roll. And height 1
A metal halide lamp with an output of 120 W / cm is installed at a position of 50 mm, and the metal halide lamp is turned on.
The film was passed through the polycarbonate resin plate at a speed of 3.0 m / min with the film as the upper surface, and the first-stage curing was performed. Next, the PET film was peeled off and the height 1
3.0 m / min under a high-pressure mercury lamp with an output of 120 W / cm installed at a position of 50 mm, with the coated surface facing upward.
Through the polycarbonate resin plate at the speed of 2
The stage was cured to obtain a polycarbonate resin plate comprising a scratch-resistant film and a substrate.

The thickness of the film was 8 μm. JIS K
When a pencil scratch test was performed according to 5400, the surface hardness was HB and the scratch resistance, appearance, and transparency were good. In addition, no molding defects such as foaming were observed in any of the above steps, and no phenomenon such as clouding or coloring of the film or the polycarbonate resin was observed even after exposure to room light for 3 months.

Further, the antibacterial performance of the polycarbonate resin plate was measured in the same manner as in Example 1, and it was found that the polycarbonate resin plate had sufficient antibacterial performance (see Table 2). Also, 8
A hot water immersion test at 0 ° C. for 120 hours revealed that the maintainability of the antibacterial performance was also good.

As a control experiment 2 to ensure that the growth conditions of the cells were appropriate, a commercially available polycarbonate resin surface-hardened plate (manufactured by Mitsubishi Engineering Plastics Co., Ltd.) to which no antibacterial property was imparted was used. , Trade name Iupilon, thickness 1 mm) and antibacterial performance was evaluated in parallel. Table 2 shows the results.

As described above, the antibacterial polycarbonate resin plate obtained in the present example has a sufficient sustained antibacterial activity and has good light resistance, appearance and scratch resistance. I understood.

A polycarbonate resin plate having both antibacterial properties and abrasion resistance was set as a front plate on the front of a commercially available video display in the same manner as in Example 1. This front plate had excellent transmittance, had a bright image, had no damage even when the surface was wiped dry with a commercially available cloth, and was excellent as a front plate and a protection plate.

Comparative Example 2 An antibacterial polycarbonate resin having an antibacterial scratch-resistant film formed on its surface in the same manner as in Example 5, except that zeolite holding silver was used as an antibacterial agent. I got a board. The obtained polycarbonate resin plate was slightly hazy, and the appearance was poor due to bumps due to aggregation of the antibacterial agent. Further, when the antibacterial polycarbonate resin plate was exposed to room light for three months, the film was colored. When the antibacterial performance was measured in the same manner as in Example 1, it was found that the antibacterial performance was low (see Table 2). From the above, it was found that the antibacterial property, light resistance and appearance of the antibacterial polycarbonate resin plate obtained in this comparative example were lower than those of the antibacterial polycarbonate resin plate obtained in Example 5.

Comparative Example 3 A commercially available general acrylic resin plate (Acrylite L manufactured by Mitsubishi Rayon Co., Ltd., 1 m thick)
When the surface hardness of m) was measured, it was 2H.

(Comparative Example 4) The surface hardness of a commercially available general polycarbonate resin plate (UPIRON manufactured by Mitsubishi Engineering-Plastics Corporation, thickness 1 mm) was measured and found to be 4B.

(Example 7) The resin plates comprising the scratch-resistant coatings of Examples 1 and 3 and the substrate were each 20 × 30
The front plate 1 is cut to a size of 1 cm, and a conductive film 2 (a base material having a conductive film 22 on the surface of which a 100 μm-thick polyester film 21 is made of ITO) is formed on a lower surface thereof. The upper transparent electrode plate 5 for a touch panel was produced by bonding together so as to be on the side. Example 3
The resin plate was prepared such that the scratch-resistant film having antireflection properties was on the upper surface. A spacer 3, a lower transparent electrode plate (conductive film 2), and a display device 4 are further attached to the lower surface of the upper transparent electrode plate 5 for the touch panel.
A display device 7 with a touch panel of a resistive film type was produced.

These front plates were excellent in transmittance, bright in images and easy to see, and were excellent as touch panels without any damage even when the surface was wiped dry with a commercially available cloth. In particular, the one using the plate of Example 3 subjected to the non-glare treatment has the advantages that the reflection of external light such as illumination is small, the image is easy to see, and the fingerprint is hardly left when the front plate is touched with a finger. Was excellent.

Example 8 A resin plate comprising a scratch-resistant film and a substrate of Example 4 was cut into a size of 20 × 30 cm to obtain a front plate 1 having an infrared LED 31 and a sensor substrate 32 on its outer periphery. A phototransistor 33 was installed, and a lens 34 was further installed. Thereafter, the optical touch panel device 36 was manufactured by covering the bezel 35. The resin plate was prepared such that a scratch-resistant film having antibacterial properties and antireflection properties was on the upper surface. The display device 4 was attached to the lower side of the device 36 to produce a display device 37 with an optical touch panel.

In the display device 37, the displayed image was bright, the display was easy to see, and the surface was not damaged even when the surface was wiped dry with a commercially available cloth. Furthermore, since it has anti-reflection properties by non-glare treatment, there is an advantage that reflection of external light such as illumination is small and a fingerprint is hardly left when touched with a finger.

[0064]

As described above, the front plate disclosed in the present invention has good abrasion resistance and uses an antibacterial agent comprising a phosphate double salt to which silver is immobilized. Antibacterial properties, light resistance and appearance are all good. In addition, the front plate in which the surface of the scratch-resistant film has antireflection properties has little reflection of external light. This front plate is suitable as a front plate for a display or a touch panel.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a touch panel using a front panel according to the present invention.

FIG. 2 is a cross-sectional view showing another example of a touch panel using the front panel of the present invention.

[Explanation of symbols]

 1: Front plate composed of a scratch-resistant film and a base material 2: Conductive film 3: Spacer 4: Display device 5: Upper electrode plate for touch panel 6: Touch panel 7: Display device with touch panel 11: Scratch-resistant film 12: Base material 13: Scratch resistant film 21: Polyester film 22: Conductive film (ITO film) 31: Infrared LED 32: Sensor substrate 33: Phototransistor 34: Lens 35: Bezel 36: Optical touch panel 37: Display with optical touch panel apparatus

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // C08L 101: 00 C08L 101: 00 F term (reference) 4F006 AA12 AA15 AA18 AA19 AA22 AA32 AA33 AA34 AA35 AA36 AA37 AA38 AA42 AB24 AB35 AB73 AB77 BA02 BA17 CA01 EA03 4F100 AA04A AB24A AB24H AG00 AK25 AK42 AT00B BA02 CA30 EJ08 EJ082 EJ54 EJ542 GB41 JC00A JK14 JK14A JM02A JN06 JN06A 5C058 AA01 BA30 BA35 DA01 DA15

Claims (4)

[Claims] 1. A front plate comprising a scratch-resistant film containing an antibacterial agent comprising a double phosphoric acid salt containing silver and a substrate. 2. The front plate according to claim 1, wherein the surface of the scratch-resistant film has an antireflection property. 3. A front panel for a display comprising the front panel according to claim 1. 4. A front panel for a touch panel, comprising the front panel according to claim 1.