JP2002055225A - Optical filter, front plate and picture display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multifunctional optical filter having excellent manufacturing suitableness, being hardly bulky and light in weight, achromatic in itself and excellent in color correcting function, suppressing lowering of hardness of a film hardened with an active energy beam due to deformation of a transparent supporting body, having a hard coat layer with >=4H hardness in a pencil hardness test and having surfaces hardly scratched and to provide a front plate and a picture display device using the same. SOLUTION: The optical filter is characterized by having the transparent supporting body consisting of one or more layers, a visible ray filter layer consisting of a dyestuff or a pigment and a binder and the hard coat layer consisting of a resin layer polymerizabe with the active energy beam, and by having >=4 GPa and <=15 GPa surface elastic modulus of a surface of the transparent supporting body on which the hard coat layer is arranged. The front plate and the liquid crystal display device utilize the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a visible filter layer for absorbing visible light (hereinafter, also simply referred to as a "filter layer"), a transparent support provided with a hard coat, and a low refractive index layer. The present invention relates to an optical filter having an achromatic color. More specifically, the present invention relates to a liquid crystal display (LCD), a plasma display panel (PD).
P), electroluminescence display (EL
D), which is preferably used for the display of an image display device such as a cathode ray tube display (CRT), a fluorescent display tube, and a field emission display, is mounted for antireflection and improved color reproducibility, and has excellent scratch resistance; The present invention relates to an optical filter having a surface hardness and an achromatic color of the filter itself. More specifically, the present invention relates to a plasma display panel (PDP) comprising an optical filter having improved antireflection and color reproducibility, excellent scratch resistance and surface hardness, and an achromatic color of the filter itself. The present invention relates to an image display device such as a front panel and a PDP body.

[0002]

2. Description of the Related Art In recent years, various types of image display devices (displays) such as a liquid crystal display (LCD), a plasma display panel (PDP), an electroluminescence display (ELD), a cathode ray tube display (CRT),
Fluorescent display tubes and field emission displays have been developed and devices incorporating them have been put into practical use. These image display devices have various problems, for example, a problem that the color purity and color separation of the display element are insufficient, a problem that the background is reflected on the display to reduce the contrast, and a problem that infrared and electromagnetic waves caused by the display element are present. Have the problem of external leakage. For each of these problems, it has been proposed to use, for example, a visible filter for color separation, an antireflection film, an infrared shielding filter, an electromagnetic wave shielding filter, etc. on the front surface of the display. However, each of these filters requires various problems depending on the type of display. For example, a visible filter for color separation needs to form a sharp absorber in accordance with the characteristics of the display element. In addition to this, heat resistance such as kneading glass or the like, and enhancement of physical properties are required. In addition, antireflection coatings need to be multilayered in order to obtain an ideal reflectance in the entire visible light range. Accompanied by Further, when a plastic film is used as a support of the antireflection film, it is required to perform a hard coat treatment so that the surface is hardly damaged. Therefore, if an optical filter placed in front of a display is to have many functions, in addition to the characteristics required for each function filter, there is a restriction that one function must not interfere with another function. . Therefore, multifunctional optical filters have not yet been put to practical use.

[0003]

In developing a multifunctional optical filter, it is necessary to solve various problems depending on the functions to be combined. As an example, a case will be described as an example in which an anti-reflection function is combined with a visible filter for color correction. Attempts have previously been made to impart the function of a visible filter by coloring a member constituting the antireflection film, for example, a transparent support or a hard coat layer. However, in this case, the types of dyes and pigments that can be added to the transparent support and the hard coat layer are very limited. The reason for this is that the transparent support is usually usually made of plastic, or even of glass. Therefore, dyes and pigments added to the transparent support are required to have extremely high heat resistance enough to withstand the temperature during the production of the support. On the other hand, the hard coat layer is generally a layer containing a crosslinked polymer. The crosslinking reaction of the polymer is performed by heating or irradiating light or the like after the application of the layer. This is because there are many dyes and pigments that fade under the reaction conditions for the crosslinking. Furthermore, dyes or pigments used for color correction are required to have various absorption spectrum characteristics depending on the type of image display device. If the types of dyes and pigments used for color correction are limited for the above reasons, it is difficult to perform appropriate correction. As another problem, when a plastic is used for the support, it is necessary to perform a hard coat treatment in order to make the surface hard to be damaged, but the hardness of the hard coat layer of the conventional hard coat film was insufficient. In addition, when the base plastic base film is deformed due to the thinness of the coating film, the hard coat layer is also deformed accordingly, and the hardness of the entire hard coat film is reduced. Therefore, it was not fully satisfactory. For example, in a hard coat film in which an ultraviolet curable paint is applied to a thickness of 3 to 15 μm on a polyethylene terephthalate film widely used as a plastic transparent support, a pencil hardness of 3H is generally used, and 9H, which is a pencil hardness of no.

[0004] On the other hand, if the thickness of the hard coat layer is simply increased even if the hardness is insufficient, the hardness of the obtained hard coat film is improved. There is a problem that curling of the hard coat film due to shrinkage increases.
For this reason, it has been difficult to obtain a hard coat film having good characteristics that can be practically used by the conventional technique.

In order to avoid the above-mentioned restrictions on dyes or pigments, the colored layer is not made of a transparent support or a hard coat layer,
It is easily conceivable to add a dye or a pigment to the polymer layer that can be formed under mild conditions and provide it as an independent visible filter layer. However, this colored polymer layer has a low affinity with a transparent support (plastic or glass) or a low refractive index layer in an antireflection film, and has a disadvantage that it easily causes a failure such as peeling. Also, separately from this, the visible filter layer itself for color correction of the image display device appears to be colored, and the visibility of the image is poor, the color correction is not sufficient, and the color of the screen when no image is displayed is changed. An achromatic visible filter has been desired because of problems such as being unfavorable. In this way, the multifunctional optical filter is limited in its material,
It is necessary to devise the arrangement of the filter layers for each function. Accordingly, an object of the present invention is to provide excellent suitability for production, light weight without being bulky, itself to be achromatic and excellent in color correction function, to suppress a decrease in hardness of an active energy ray-cured film due to deformation of a transparent support, and to carry out a pencil hardness test. It is an object of the present invention to provide a multifunctional optical filter having a hard coat layer having a hardness of 4H or more and having a hardly damaged surface, a front plate using the same, and an image display device.

[0006]

SUMMARY OF THE INVENTION The above-mentioned object of the present invention is as follows.
This has been achieved by the optical filter described in the following items 1) to 13), the front plate described in the item 15), and the image display device described in the items 14) and 16). Listed below are preferred embodiments. 1) A surface having a transparent support composed of one or two or more layers, a visible filter layer composed of a dye or pigment and a binder, and a hard coat layer composed of an active energy ray polymerizable resin layer, on which the hard coat layer is provided An optical filter, wherein the transparent support has a surface elastic modulus of 4 GPa or more and 15 GPa or less. 2) The transparent support on the surface provided with the hard coat layer has a thickness of 1 nm.
10% by mass or more of 60 to 400 nm or less of inorganic fine particles.
Item 1. The optical filter according to Item 1), which is a polyester film containing not more than mass%. 3) The transparent support on the surface provided with the hard coat layer has a thickness of 1 nm.
10% by mass or more of 60 to 400 nm or less of inorganic fine particles.
A polyester support (layer A) containing a layer (layer B) containing less than 10% by mass
Item 1. The optical filter according to item 1) or 2), wherein the film is a film laminated on at least one surface. 4) The total thickness of the transparent support provided with the hard coat layer (sum of the thickness of the layer A and the thickness of the layer B) is 50 μm or more and 300 or more.
μm or less, and the thickness of the B layer is 1 μm or more and 100 μm or more.
The optical filter according to item 3) below. 5) The optical filter according to any one of 1) to 4), wherein the polyester film is made of a polyethylene terephthalate resin or a polyethylene naphthalate resin. 6) The active energy ray polymerizable resin layer has a Mohs hardness of 6
As described above, the optical filter according to any one of Items 1) to 5), which contains inorganic fine particles having a particle size of 1 nm to 400 nm. 7) The active energy ray-polymerizable resin layer is composed of a binder polymer obtained by crosslinking inorganic fine particles and a polyfunctional acrylate compound, and the inorganic fine particles are at least one of aluminum oxide, silicon dioxide, titanium dioxide, and zirconium oxide. The optical filter according to any one of Items 1) to 6), comprising: 8) The inorganic fine particles contained in the active energy ray polymerizable resin layer are subjected to a surface treatment, and the surface treatment is performed by an active energy ray curing group and an anionic functional group selected from a phosphoric acid group, a sulfonic acid group and a carboxylic acid group. Item 1. The optical filter according to any one of Items 1) to 7), wherein the optical filter is an organic compound having a group or an organic metal compound containing at least one of aluminum, titanium, and zirconium. 9) The optical filter according to any one of items 1) to 8), wherein the visible filter layer has an absorption maximum having a transmittance of 0.01 to 50% in a wavelength range of 560 to 620 nm. 10) The visible filter layer has an absorption maximum of 0.01 to 50% in a wavelength range of 560 to 620 nm and an average transmittance of 70% or less in a wavelength range of 380 to 440 nm. 9) Any one
An optical filter according to any one of the above. 11) The visible filter layer has an absorption maximum having a transmittance of 20 to 85% in a wavelength range of 500 to 550 nm.
Item 1. The optical filter according to any one of Items 1) to 10), having an absorption maximum having a transmittance of 0.01 to 50% in a wavelength range of 60 to 620 nm. 12) The visible filter layer has an absorption maximum having a transmittance of 20 to 85% in a wavelength range of 500 to 550 nm.
Item 1) to item 11), wherein each of them has an absorption maximum having a transmittance of 0.01 to 50% in a wavelength range of 60 to 620 nm and an average transmittance of 70% or less in a wavelength range of 380 to 440 nm. An optical filter according to any one of the above. 13) The visible filter layer has an absorption maximum having a transmittance of 20 to 85% in a wavelength range of 460 to 500 nm and a wavelength range of 500 to 550 nm, and has a maximum of 560.
Having an absorption maximum with a transmittance of 0.01 to 50% in a wavelength range of 380 to 620 nm, respectively.
Item 1. The optical filter according to any one of Items 1) to 12), wherein the average transmittance in a wavelength range of nm is 70% or less. 14) An image display device using the optical filter according to any one of 1) to 13). 15) A front panel of a plasma display panel using the optical filter according to any one of Items 1) to 13). 16) The image display device according to item 14), which is a plasma display panel.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical layer structure of an optical filter used in an image display device according to the present invention will be described with reference to the drawings. Hereinafter, a layer configuration in the case of using as an optical filter for a cathode ray tube display (CRT) and a plasma display panel (PDP) or a front plate having an optical filter will be described.

FIG. 1 is a conceptual cross-sectional view when an optical filter 3 or a front plate 4 of the present invention is used on the front surface of a main body 1 of a cathode ray tube display (CRT) or a plasma display panel (PDP). FIG. 1A shows an optical filter 3 including a plastic support in which various filter layers, a hard coat layer, an anti-reflection layer, and the like are provided on one side or both sides of the support of the optical filter. In this case, FIG. 1 (b) shows a space between the main body 1 and the front plate 4,
It is a conceptual diagram in case the optical filter which consists of various filter layers, a hard coat layer, and an antireflection layer or its part 3 is provided in both surfaces of the support body of a front plate. In the present invention, the “front plate” refers to an optical filter comprising various filter layers, a hard coat layer, an antireflection layer or a part thereof, on one side or both sides of another support (eg, plastic or transparent glass). And is disposed between the display device and the observer, preferably immediately before the display device.

FIG. 2 is an example of a schematic cross-sectional view of the layer structure of the optical filter and the front plate, but is not limited to these. FIGS. 2A and 2B are examples of the layer configuration of the optical filter corresponding to the arrangement of FIG.
(c) and FIG. 2 (d) are examples of the layer structure of the front plate corresponding to the arrangement of FIG. 1 (b). In FIGS. 2A and 2B, it is preferable to provide an undercoat layer between the plastic transparent support and the hard coat layer and between the plastic transparent support and the filter layer in order to obtain a sufficient adhesive strength. It is also possible to separately form a film on one side of the boundary between the electromagnetic wave shielding layer and the filter layer on both sides, and to bond the two with an adhesive. The optical filter and the image display device main body can be easily bonded to each other using, for example, a commercially available acrylic adhesive. In FIG. 2 (c) and FIG. 2 (d), in order to obtain a sufficient adhesive strength between the plastic transparent support and the hard coat layer, between the plastic transparent support and the filter layer, and between the plastic transparent support and the antireflection layer. It is preferable to provide an undercoat layer on the undercoat layer. In FIG. 2 (c), a method can be used in which the adhesive is applied between the transparent plastic support and the transparent glass support and between the visible filter layer and the electromagnetic wave shielding layer. In FIG. 2 (d), a method may be adopted in which the filter layer and the glass transparent support and the electromagnetic wave shielding layer and the glass transparent support are each bonded with an adhesive. The optical filter of the present invention is shown in FIGS.
In any of the configurations, when the image display device as the final finished product is viewed from the front side, the color is preferably close to achromatic. The degree of the achromatic color of the optical filter is in the range represented by the following formula (I) when the color is measured according to the measuring method of a reflecting object described in JIS Z 8722 and illuminated with standard light D65. Is preferred. 0 ≦ | a * | ≦ 10, 0 ≦ | b * | ≦ 10 (I) Here, a * and b * represent a * and b * values in the CIE 1976 L * a * b * color space, and JIS Z It shall be displayed according to 8729. More preferably, it is in the range of −5 ≦ a * ≦ 5 and −10 ≦ b * ≦ 0.

The materials constituting the optical filter of the present invention and the front plate using the same and the structure thereof will be described below, but the present invention is not limited thereto. (Plastic transparent support) Examples of materials for forming the plastic transparent support include cellulose esters (eg, diacetyl cellulose, triacetyl cellulose (TA).
C), propionyl cellulose, butyryl cellulose,
Acetylpropionyl cellulose, nitrocellulose), polyamide, polycarbonate, polyester (eg, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, poly-1,4)
-Cyclohexane dimethylene terephthalate, polyethylene-1,2-diphenoxyethane-4,4'-dicarboxylate), polyarylate (eg, bisphenol
A and phthalic acid condensate), polystyrene (eg, syndiotactic polystyrene), polyolefin (eg, polyethylene, polypropylene, polymethylpentene), acryl (polymethylmethacrylate), polysulfone,
Includes polyethersulfone, polyetherketone, polyetherimide and polyoxyethylene. Polyester, polycarbonate and polyarylate are preferred. Polyethylene terephthalate and polyethylene naphthalate are most preferred. The thickness of the support is preferably 5 μm or more and 5 cm or less, and 25 μm or more and 1 cm or less.
And more preferably 80 μm or more and 1.2 μm or less.
Most preferably, it is not more than mm. The transmittance of the transparent support is preferably 80% or more, more preferably 86% or more. The haze is preferably at most 2%, more preferably at most 1%.
The refractive index is preferably from 1.45 to 1.70.

An infrared absorber or an ultraviolet absorber may be added to the transparent support. The amount of infrared absorber added
It is preferably 0.01 to 20% by mass of the transparent support, more preferably 0.05 to 10% by mass. Further, as a slipping agent, particles of an inert inorganic compound may be added to the transparent support. Examples of the inorganic _{compound, SiO 2, TiO 2, BaSO} 4, CaCO 3, talc and kaolin.

The transparent support is preferably subjected to a surface treatment in order to further enhance the adhesiveness with the undercoat layer. Examples of surface treatment include chemical treatment, mechanical treatment, corona discharge treatment, flame treatment, ultraviolet irradiation treatment, high frequency treatment, glow discharge treatment, active plasma treatment, laser treatment, mixed acid treatment,
And ozone oxidation treatment. Glow discharge treatment, ultraviolet irradiation treatment, corona discharge treatment and flame treatment are preferred, and corona discharge treatment is more preferred. (Hard Coat Layer) FIG. 3 shows an example of a layer structure of a portion in which a hard coat layer, which is a preferred embodiment of the hard coat portion of the present invention, is provided on a plastic transparent support. It consists of providing an active energy ray polymerizable resin layer on the surface of a transparent support having a large surface elastic modulus.

The transparent support having a large surface elastic modulus has a surface elastic modulus of 4 GPa or more and 15 GPa or less, preferably 4.5 GPa or more and 12 GPa or less, and more preferably 5 GPa or less.
A polyester film having a GPa of 10 GPa or more is preferable. The surface elastic modulus is a value obtained by using a micro surface hardness tester. The specific method is as follows. Using a micro surface hardness meter (Fisher Instruments Co., Ltd .: Fisherscope H100VP-HCU), contact the sample surface with a Vickers indenter, then increase the load to 1 mN in 10 seconds, and 5 seconds in this state Hold. The penetration depth of the Vickers indenter at this time is defined as Dv0. After this,
When the load is set to 0 mN, the force (Fv) for pushing back the Vickers indenter and the penetration depth (Dv) are measured, and the inclination is defined as the surface elastic modulus. That is, when Dv is plotted on the horizontal axis and Fv is plotted on the vertical axis, the absolute value of the slope between Dv and 0.9 × Dv0 is defined as the surface elastic modulus. This measurement was performed at 25 ° C. and 60% RH, and represented by an average value of 10 points.

The present invention is characterized in that extremely small fine particles are uniformly dispersed at a high concentration, and is contained in the polyester in a range of 1 nm to 400 nm, more preferably 5 nm.
Or more and 200 nm or less, more preferably 10 nm or more and 1
Fine particles having a size of 00 nm or less are added in an amount of 10% by mass to 60% by mass, more preferably 15% by mass to 50% by mass, and more preferably 20% by mass to 45% by mass. If it is less than 1 nm, dispersion is difficult, and aggregated particles are formed.
If it is 0 nm or more, the haze increases, and in both cases, the transparency decreases.

Preferred fine particles include inorganic fine particles such as silica, alumina, titania, zirconia, mica, talc, calcium carbonate, barium sulfate, zinc oxide, magnesium oxide, calcium sulfate, kaolin, and organic fine particles such as cross-linked polystyrene. Can be More preferably silica, alumina, titania, zirconia, mica,
Talc, calcium carbonate. The shape may be any of an irregular shape, a plate shape, a spherical shape, and a needle shape, and two or more kinds of fine particles may be mixed and used.

These fine particles may be added together with the monomer prior to the polymerization of the polyester, or may be added after the polymerization of the polyester. Therefore, the latter is more preferable because it is easy to be uniformly dispersed. These fine particles are preferably surface-modified in order to improve the wettability with the polyester. Examples of the surface modifier include coupling agents such as higher fatty acids, metal salts of higher fatty acids, higher fatty acid esters, higher fatty acid amides, silicates, titanates, and aluminates.

Prior to the dispersion of the fine particles, it is preferable to add these fine particles to the melt of the oligomer of the polyester and coat the surfaces of the fine particles with the polyester in advance. The preferred intrinsic viscosity of the oligomer is 0.05 or more and 0.1.
4 or less, more preferably 0.1 or more and 0.3 or less, further preferably 0.1 or more and 0.2 or less. The preferred ratio (P / O) of the oligomer (O) to the fine particles (P) is 1 or more and 1 or more.
00 or less, more preferably 3 or more and 50 or less, more preferably 5 or more and 20 or less.

For mixing the oligomer and the fine particles, a Banbury mixer, a kneader, a roll mill, a single-screw or twin-screw extruder can be used. The mixing temperature is preferably from 100 ° C to 350 ° C, more preferably from 120 ° C to 300 ° C, and still more preferably from 150 ° C to 250 ° C. The mixing time is from 1 minute to 200 minutes, more preferably from 2 minutes to 100 minutes, and still more preferably from 3 minutes to 3 minutes.
It is preferably 0 minutes or less.

Thereafter, the mixture is further kneaded with the polyester.
For kneading, a Banbury mixer, a kneader, a roll mill, a single-screw or twin-screw extruder can be used. The mixing temperature is 200 ° C. or higher and 350 ° C. or lower, more preferably 24 ° C.
0 ° C or more and 340 ° C or less, more preferably 260 ° C or more and 330 ° C or less, and the mixing time is 1 minute or more and 200 minutes or less, more preferably 2 minutes or more and 100 minutes or less, and still more preferably 3 minutes or more.
The time is preferably from 30 minutes to 30 minutes.

The polyester containing such fine particles may form a film with a single layer, but is more preferably used in a laminated film. As a result, the difference between the surface elastic modulus of the front and back surfaces is 0.5 GPa or more and 10 GPa or less, more preferably 0.8 GPa or more and 7 GPa, and still more preferably 1.0 GPa.
It is preferable to set it to Pa or more and 5 GPa or less. If the surface hardness is high on both sides, the holding force with the transport roll is reduced, and abrasion due to slip is likely to occur during film formation. In such a laminated film, a polyester layer (B layer) containing fine particles may be laminated (B / A) on one side of a polyester layer (A layer) having a smaller fine particle content than the B layer, May be laminated (B / A / B ') on the A layer on the opposite side of the B layer.

The total thickness of the polyester film used in the present invention is preferably 50 μm or more and 300 μm or less, more preferably 80 μm or more and 260 μm or less, and still more preferably 80 μm or more and 250 μm or less. The thickness of the B layer and the B ′ layer is preferably 1 μm or more and 100 μm or less, more preferably 5 μm or more and 80 μm or less, and still more preferably 10 μm or less.
m or more and 50 μm or less.

Particle size (D) of fine particles and thickness of B layer and B 'layer
The ratio of (Tb) (D / Tb) is 1 × 10 ^- 1 × 10 ^-5 or more preferably less than ^2, more preferably 5 × 10 ^{- 3} below 1 × 10 ^{- 4}
Or more, more preferably 1 × 10 ^-3 or less 1 × 10 ^{- 4} or more.

The polyester film used in the present invention can be formed as follows. (1) Drying of polyester resin The polyester pellets are heated at 100 ° C to 250 ° C, more preferably at 130 ° C to 200 ° C for 5 minutes to 5 minutes.
The drying is performed for not more than an hour, more preferably for not less than 10 minutes and not more than 1 hour. (2) Melt Extrusion The pellets for the A layer, the B layer, and the B 'layer are each melted in a uniaxial or multiaxial kneading extruder. At this time, a pellet to which a desired amount of fine particles is added from the beginning may be used,
A pellet (master pellet) to which fine particles have been added in advance at a high concentration may be diluted with a pellet to which fine particles have not been added to adjust to a desired concentration. The polyester is extruded at a temperature of from 250 ° C. to 350 ° C., preferably from 260 ° C. to 340 ° C., for 1 minute to 30 minutes, more preferably from 3 minutes to 15 minutes to melt. After this,
It is preferable to previously filter the molten polymer using a filter. Examples of the filter include wire mesh, sintered wire mesh, sintered metal, sand, glass fiber, and the like. Preferred filter size is 1 μm or more and 30 μm
m or less. The molten polyester is extruded from a T-die. When making a laminated film, T
Each component is extruded using a die (such as a multi-manifold die). This is solidified on a casting drum of 40 ° C to 100 ° C to prepare an unstretched film. At this time, the adhesion of the film to the casting drum is increased by using an electrostatic application method, a water film formation method (applying a fluid such as water on the casting drum to improve the adhesion between the melt and the drum), and the like. It is preferable because the flatness can be improved. This is peeled off to form an unstretched sheet. (3) MD stretching The unstretched sheet is stretched in the longitudinal direction (MD). The preferred stretching ratio is 2.5 times or more and 4 times or less, more preferably 3 times or more and 4 times or less. The stretching temperature is preferably from 70 ° C to 160 ° C, more preferably from 80 ° C to 150 ° C,
More preferably, the temperature is from 80 ° C to 140 ° C. The preferred stretching speed is from 10% / sec to 300% / sec, more preferably from 30% / sec to 250% / sec, even more preferably from 50% / sec to 200% / sec. Such MD stretching can be performed by transporting between a pair of rolls having different peripheral speeds. (4) TD stretching The stretching ratio is preferably 2.5 times or more and 5 times or less, more preferably 3 times or more and 4.5 times or less, and even more preferably 3.3 times or less.
It is not less than twice and not more than 4.3 times. Stretching temperature is 75 ° C or higher and 16
5 ° C. or less, more preferably 80 ° C. or more and 160 ° C.
° C or lower, more preferably 85 ° C or higher and 155 ° C or lower. Preferred stretching speed is 10% / sec or more and 300% / sec or less, more preferably 30% / sec or more and 250% / sec or less,
More preferably, it is 50% / second or more and 200% / second or less. TD stretching can be achieved by chucking the film at both ends, transporting the film into a tenter, and widening the film. (5) Heat setting A preferable heat setting temperature is 190 ° C or more and 275 ° C or less, more preferably 210 ° C or more and 270 ° C or less, further preferably 230 ° C or more and 270 ° C or less, and a preferable treatment time is 5 seconds or more and 180 seconds or less. More preferably 10 seconds or more 1
It is 20 seconds or less, more preferably 15 seconds or more and 60 seconds or less. It is preferable to relax in the width direction between 0% and 10% during heat setting. It is more preferably 0% or more and 8% or less, and further preferably 0% or more and 6% or less. Such heat setting and relaxation can be achieved by chucking the film at both ends, transporting the film to the heat setting zone, and reducing the width thereof. (6) Winding After heat fixation, cooling and trimming are performed and wound up on a roll.
At this time, it is also preferable to apply a knurling process to the end of the support. Preferred film forming width is 0.5 m or more and 10 m or less, more preferably 0.8 m or more and 8 m or less,
More preferably, it is 1 m or more and 6 m or less.

It is preferred that the polyester support thus prepared is subjected to a surface treatment. Among the surface treatments, corona treatment, ultraviolet treatment, glow treatment, and flame treatment are particularly effective. These can be carried out in accordance with the method described in "Invention Association Disclosure Technique, Official Technique No. 94-6023".

It is preferable to provide an antistatic layer. Antistatic agents include metal oxides, conductive metals, carbon fibers, and π-conjugated polymers (polyarylene vinylene, etc.)
Examples thereof include ionic compounds, and have a volume resistivity of 10 ⁷ Ωcm or less, more preferably 10 ⁶ Ωcm or less, and still more preferably 10 ⁵ Ωcm or less. Conductive metal oxides and derivatives thereof, and the like, a conductive material particularly preferably used among this is a crystalline metal oxide _{particles, ZnO, TiO 2, SnO 2} , Al 2
O ₃ , In ₂ O ₃ , SiO ₂ , MgO, BaO, MoO
₃ , V ₂ O ₅ , and particularly preferred are those containing SnO ₂ as a main component and containing about 5 to 20% of antimony oxide, and / or
Alternatively, another component (for example, silicon oxide, boron, phosphorus, or the like) is contained. For details of these conductive materials and coating methods, refer to “Invention Association's published technique
-6023 "and can be carried out in accordance with the description.

Further, one or more undercoat layers can be provided to improve the adhesion to the layer laminated on the transparent support. Materials for the undercoat layer include vinyl chloride, vinylidene chloride, butadiene, (meth) acrylate,
Examples include copolymers such as vinyl esters or water-soluble polymers such as latex and gelatin.

As the hard coat used in the present invention, a known curable resin can be used, and there are a thermosetting resin, an active energy ray polymerizable resin and the like, and an active energy ray curable resin is preferable. As the thermosetting resin, there is a resin utilizing a crosslinking reaction of a prepolymer such as a melamine resin, a urethane resin, and an epoxy resin.

Examples of the active energy ray include radiation, gamma ray, alpha ray, electron beam and ultraviolet ray, and ultraviolet ray is preferred. The active energy ray-curable resin layer contains a crosslinked polymer. The active energy ray-curable layer containing a crosslinked polymer can be formed by applying a coating solution containing a polyfunctional monomer and a polymerization initiator on the above-mentioned transparent base film and polymerizing the polyfunctional monomer. The functional group of these monomers is preferably an ethylenically unsaturated double bond group.

The polyfunctional monomer is preferably an ester of a polyhydric alcohol and acrylic acid or methacrylic acid. Examples of polyhydric alcohols include ethylene glycol, 1,4-cyclohexanol, pentaerythritol, glycerin, trimethylolpropane, trimethylolethane, dipentaerythritol, 1,2,4-cyclohexanol, polyurethane polyol and polyester polyol. included. Of these, trimethylolpropane, pentaerythritol, dipentaerythritol and polyurethane polyol are preferred. Two or more polyfunctional monomers may be used in combination.

By adding inorganic fine particles to these active energy ray-cured layers, the crosslinking shrinkage as a film can be improved and the hardness of the coating film can be increased. As the inorganic fine particles, those having high hardness are preferable, and inorganic particles having Mohs hardness of 6 or more are preferable. For example, silicon dioxide particles, titanium dioxide particles, zirconium oxide particles, and aluminum oxide particles are included.

The average particle diameter of these inorganic fine particles is 1n
m to 400 nm, more preferably 5 nm to 20
0 nm or less, more preferably 10 nm or more and 100 nm
The following fine particles are added in an amount of 10% by mass or more and 60% by mass or less, more preferably 15% by mass or more and 50% by mass or less, more preferably 20% by mass or more and 45% by mass or less. If it is less than 1 nm, it is difficult to disperse, and agglomerated particles are formed.

In general, inorganic fine particles have a poor affinity for a binder polymer, so that the interface is easily broken simply by mixing the two, and it is difficult to improve the scratch resistance and crack as a film. In order to improve the affinity between the inorganic fine particles and the polymer binder, the surface of the inorganic fine particles can be treated with a surface modifier containing an organic segment. The surface modifier is required to form a bond with the inorganic fine particles on the one hand and to have a high affinity for the binder polymer on the other hand, and as a functional group capable of forming a bond with a metal, silane, aluminum, titanium, zirconium And a compound having an anionic group such as phosphoric acid, sulfonic acid, and carboxylic acid group. Further, it is preferable that the polymer is chemically bonded to the binder polymer, and that a vinyl polymer group or the like is introduced into a terminal is preferable. For example, when a binder polymer is synthesized from a monomer having an ethylenically unsaturated group as a polymerizable group and a crosslinkable group, it is preferable that the metal alkoxide compound or the anionic compound has an ethylenically unsaturated group at a terminal. . According to the hard coat layer formulation of the present invention, excellent surface hardness can be obtained without causing adverse effects such as cracking of the hard coat layer and peeling off from the plastic support. For example, a hardness of 4H or more can be easily achieved in a pencil hardness test. The test is carried out using a test pencil specified by JIS-S-6006 and according to a pencil hardness evaluation method specified by JIS-K-5400. The value of the evaluation result is a value of pencil hardness at which no flaw is observed at a load of 9.8 N.

The surface treatment agent of organometallic compound Example a) a silane-containing organic compound _{a-1 H 2 C = CHCOOC} 4 H 8 OSi (OC 4 H 9) 3 a-2 (H 2 C = CHCOOC 4 H 8 O) ₂ Si (OC _{4
H 9) 2 a-3 (} H 2 C = CHCOOC 4 H 8 O) 3 SiOC 4 H 9 a-4 H 2 C = CHCOOC 3 H 6 OSi (OC 4 H 9) 3 a-5 (H 2 C = CHCOOC ₃ H ₆ O) ₂ Si (OC _{4
H 9) 2 a-6 (} H 2 C = CHCOOC 3 H 6 O) 3 SiOC 4 H 9

B) Example of aluminum-containing organic compound b-1 H ₂ C ＝ CHCOOC ₄ H ₈ OAl (OC ₄ H ₉ ) ₂ b-2 H ₂ C ＝ CHCOOC ₃ H ₆ OAl (OC ₃ H ₇ ) ₂ b- _{3 H 2 C = CHCOOC 2 H} 4 OAl (OC 2 H 5) 2 b-4 H 2 C = CHCOOC 2 H 4 OC 2 H 4 OAl (O
_{C 2 H 4 OC 2 H 5} ) 2 b-5 H 2 C = C (CH 3) COOC 4 H 8 OAl (OC
_{4 H 9) 2 b-6} H 2 C = CHCOOC 4 H 8 OAl (OC 4 H 9)
OC ₄ H ₈ COOCH = CH ₂ b-7 H ₂ C = CHCOOC ₂ H ₄ OAl ｛O (1,4-p
h)｝ ₂

[0035] c) a zirconium-containing organic compound _{c-1 H 2 C = CHCOOC} 4 H 8 OZr (OC 4 H 9) 3 c-2 H 2 C = CHCOOC 3 H 7 OZr (OC 3 H 7) 3 c-3 _{H 2 C = CHCOOC 2 H 4} OZr (OC 2 H 5) 3 c-4 H 2 C = C (CH 3) COOC 4 H 8 OZr (OC
_{4 H 9) 3 c-5} {CH 2 = C (CH 3) COO} 2 Zr (OC 4 H
₉ ) ₂

D) Titanium-containing organic compound d-1 {H ₂ C ＝ C (CH ₃ ) COO} ₃ TiOC ₂ H ₄
OC ₂ H ₄ OCH ₃ d-2 Ti ｛OCH ₂ C (CH ₂ OC ₂ H ₄ CH = C
_{H 2) 2 C 2 H 5} } 4 d-3 H 2 C = CHCOOC 4 H 8 OTi (OC 4 H 9) 3 d-4 H 2 C = CHCOOC 3 H 7 OTi (OC 3 H 7) 3 d- _{5 H 2 C = CHCOOC 2 H} 4 OTi (OC 2 H 5) 3 d-6 H 2 C = CHCOOSiOTi (OSiCH 3)
_{3 d-7 H 2 C =} C (CH 3) COOC 4 H 8 OTi (OC
₄ H _{9) 3}

Examples of Surface Treatment Agent Containing Anionic Functional Group e) Examples of Organic Compound Containing Phosphate Group e-1 H ₂ C ＝ C (CH ₃ ) COOC ₂ H ₄ OPO (O
_{H) 2 e-2 H 2} C = C (CH 3) COOC 2 H 4 OCOC 5 H
_{10 OPO (OH) 2 e-} 3 H 2 C = CHCOOC 2 H 4 OCOC 5 H 10 OPO
_{(OH) 2 e-4 H} 2 C = C (CH 3) COOC 2 H 4 OCOC 5 H
_{10 OPO (OH) 2 e-} 5 H 2 C = C (CH 3) COOC 2 H 4 OCOC 5 H
₁₀ OPOC ₁₂ e-6 H ₂ C ＝ C (CH ₃ ) COOC ₂ H ₄ CH ｛OPO
_{(OH) 2) 2 e-} 7 H 2 C = C (CH 3) COOC 2 H 4 OCOC 5 H
₁₀ OPO (ONa) ₂ e-8 H ₂ C = CHCOOC ₂ H ₄ OCO (1,4-ph)
_{C 5 H 10 OPO (OH)} 2 e-9 (H 2 C = C (CH 3) COO) 2 CHC 2 H 4 O
COC ₅ H ₁₀ OPO (OH) ₂

[0038] f) sulfonic acid group-containing organic compound Example _{f-1 H 2 C = C} (CH 3) COOC 2 H 4 OSO 3 H f-2 H 2 C = C (CH 3) COOC 3 H 6 SO 3 H _{f-3 H 2 C = C} (CH 3) COOC 2 H 4 OCOC 5 H
₁₀ OSO ₃ Hf-4 H ₂ C = CHCOOC ₂ H ₄ OCOC ₅ H ₁₀ OSO
_{3 H f-5 H 2 C} = CHCOOC 12 H 24 (1,4-ph) SO 3
_{H f-6 H 2 C =} C (CH 3) COOC 2 H 4 OCOC 5 H
₁₀ OSO ₃ Na

G) Example of carboxylic acid group-containing organic compound g-1 H ₂ C ＝ CHCOO (C ₅ H ₁₀ COO) ₂ H g-2 H ₂ C ＝ CHCOOC ₅ H ₁₀ COOH g-3 H ₂ C = CHCOOC ₂ H ₄ OCO (1,2-ph)
_{COOH g-4 H 2 C =} CHCOO (C 2 H 4 COO) 2 H g-5 H 2 C = C (CH) COOC 5 H 10 COOH g-6 H 2 C = CHCOOC 2 H 4 COOH wherein ph is Indicates a phenyl group.

The surface modification of the inorganic fine particles is preferably performed in a solution. Add inorganic fine particles to the solution in which the surface modifier is dissolved, using ultrasonic waves, a stirrer, a homogenizer, a dissolver, a sand grinder,
It is preferable to stir and disperse.

As a solution for dissolving the surface modifier, a highly polar organic solvent is preferable. Specific examples include known solvents such as alcohols, ketones, and esters.

The above-mentioned polyfunctional monomer and polymerization initiator are added to the surface-modified inorganic fine particle solution to obtain an active energy ray-curable coating solution.

Examples of photopolymerization initiators include acetophenones, benzophenones, Michler's ketone, benzoylbenzoate, benzoins, α-amyloxime esters, tetramethylthiuram monosulfide and thioxanthones. A photosensitizer may be used in addition to the photopolymerization initiator. Examples of photosensitizers include n-butylamine, triethylamine, tri-n-butylphosphine, and thioxanthone.

The photopolymerization initiator is preferably used in an amount of 0.1 to 15 parts by weight, more preferably 1 to 10 parts by weight, based on 100 parts by weight of the polyfunctional monomer. The photopolymerization reaction is preferably performed by ultraviolet irradiation after application and drying of the active energy ray cured layer.

The production of the hard coat film of the present invention is as follows.
Active energy ray-curable paint is formed on a transparent support by a known thin film forming method such as dipping method, spinner method, spray method, roll coater method, gravure method, wire bar method, etc., dried and irradiated with active energy rays. be able to.

(Visible Filter Layer) The visible filter layer is a layer that selectively absorbs visible light (wavelength range from 380 to 780 nm). The thickness of the filter layer is preferably from 0.1 μm to 5 cm, and from 0.5 μm to 1 cm.
cm, more preferably 1 μm to 7 mm
Is most preferred. The filter layer preferably has an absorption maximum in the wavelength range of 560 to 620 nm (560 nm to 620 nm, the same applies hereinafter), and more preferably has an absorption maximum in the wavelength range of 580 to 600 nm. Also, 500 to 550 nm
May have an absorption maximum in the above wavelength range. The transmittance in the wavelength range of 500 to 550 nm is preferably in the range of 20 to 85%, more preferably in the range of 40 to 85%. The absorption maximum in the wavelength range of 500 to 550 nm is set to adjust the emission intensity of the green phosphor having high visibility. It is preferable that the emission region of the green phosphor be cut smoothly. 500 to 55
The half width at the absorption maximum in the wavelength range of 0 nm (the width of the wavelength region showing half the absorbance at the absorption maximum) is preferably 30 to 300 nm, and 40 to 30 nm.
0 nm is more preferable, and 50 to 150 n
m, more preferably 60 to 150 nm
Is most preferred.

The transmittance at the absorption maximum in the wavelength range of 560 to 620 nm is preferably in the range of 0.01 to 50%, more preferably 0.01 to 40%.
Range. The absorption maximum in the wavelength range of 560 to 620 nm is set in order to selectively cut the sub-band that reduces the color purity of the red phosphor. In PDP, 585 nm emitted by the excitation of neon
The unnecessary light emission in the vicinity is cut, and at the same time, the light on the short wavelength side from the red phosphor is cut. By separating the absorption maximum according to the present invention, light can be selectively cut without adversely affecting the color tone of the green phosphor. In order to further reduce the effect on the color tone of the green phosphor, it is preferable to sharpen the peak of the absorption spectrum. Specifically, 56
The half width at the absorption maximum in the wavelength range of 0 to 620 nm is preferably 5 to 200 nm, more preferably 10 to 100 nm, and most preferably 12 to 50 nm. 460 to 50
The transmittance at the absorption maximum in the wavelength range of 0 nm is preferably in the range of 20 to 85%, more preferably 4 to 85%.
It is in the range of 0 to 85%. 460 to 500 nm
Is set in order to suppress coloring of the visible filter and to make it achromatic. It is preferable to sharpen the peak of the absorption spectrum in order to reduce the adverse effect on the brightness and the color correction function. Specifically, 460
The half width at the absorption maximum in the wavelength range of
Preferably it is 5 to 200 nm, more preferably 10 to 150 nm, and 15 to 10 nm.
Most preferably, it is 0 nm.

The average transmittance T ₁ in the wavelength range from 380 to 440 nm is defined by the following equation.

(Equation 1) Where T (375 + 5n) is the wavelength (375 + 5n) nm
Shows the transmittance (%) of the sample.

The average transmittance in the wavelength range of 380 to 440 nm is preferably 70% or less, more preferably 60% or less. More specifically, the average transmittance in the wavelength range of 380 to 440 nm is preferably 1 to 70% (meaning “1% or more and 70% or less, the same in the present application”), and more preferably 5 to 60%. And most preferably 10 to 50%. Absorption in the wavelength range of 380 to 440 nm is set in order to suppress the bluish coloring of the visible filter itself and to make it achromatic.

The average transmittance in the wavelength range of 640 to 780 nm is defined by the following equation.

(Equation 2) In the formula, T (635 + 5n) is a wavelength (635 + 5n) nm.
Represents transmittance (%).

The average transmittance in the wavelength range of 640 to 780 nm is preferably 70% or less, more preferably 60% or less. More specifically, the average transmittance is preferably 1 to 70%, more preferably 5 to 60%, and most preferably 10 to 5%.
0%. Absorption in the wavelength range of 640 to 780 nm is set to suppress reddish coloring of the visible filter itself and to make it achromatic.

The wavelength range from 380 to 440 nm and 64
In the adjustment of the average transmittance in the wavelength range of 0 to 780 nm, one or both of the ranges are adjusted to the above range so that the color of the filter itself approaches an achromatic color as much as possible. Position of the absorption maximum in the wavelength range of 560 to 620 nm and its transmittance, 500 to 550
The color of the filter itself slightly changes depending on the position of the absorption maximum and its transmittance in the wavelength range of nm, the positional relationship between the two absorptions, and the intensity ratio of the absorption intensity. Therefore, it is necessary to adjust the transmittance in the wavelength range of 380 to 440 nm and the wavelength range of 640 to 780 nm according to the filter design specifications. When adjusting the transmittance to reduce the luminance or minimize the adverse effect on the color correction function, the change in the transmittance around 440 nm is desirably as steep as possible, and the transmittance at 445 nm is preferably 75. %, More preferably 80% or more. Similarly, the change in transmittance around 640 nm is desirably as steep as possible, and the transmittance at 635 nm is preferably at least 75%, more preferably at least 80%.

In order to provide the above absorption spectrum,
A filter layer can be formed using a coloring matter (dye or pigment). As the dye having an absorption maximum in the wavelength range of 500 to 550 nm, a squarylium-based, azomethine-based, cyanine-based, oxonol-based, anthraquinone-based, azo- or benzylidene-based compound is preferably used. As azo dyes, GB539703
Many azo dyes described in No. 5,756,91, US Pat. No. 2,956,879 and Hiroshi Horiguchi, “Review Synthetic Dyes”, published by Sankyo Publishing Co., Ltd. can be used. Examples of the dye having an absorption maximum in the wavelength range of 500 to 550 nm are shown below.

[0054]

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[0055]

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[0056]

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As the dye having an absorption maximum in the wavelength range of 560 to 620 nm, cyanine, squarylium, azomethine, xanthene, oxonol and azo compounds are preferably used. Examples of the dye having the absorption maximum in the wavelength range of 560 to 620 nm are shown below.

[0058]

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[0059]

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[0060]

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A dye having an absorption maximum in both the wavelength range of 500 to 550 nm and the wavelength range of 560 to 620 nm can be used for the filter layer. For example, when the dye is in an aggregated state such as a fine particle dispersion, the wavelength generally shifts to the longer wavelength side, and the peak becomes sharp. For this reason, some dyes having an absorption maximum in the wavelength range of 500 to 550 nm have an aggregate having an absorption maximum in the range of 560 to 620 nm. When such a dye is used in a partially associated state, an absorption maximum can be obtained in both the wavelength range of 500 to 550 nm and the wavelength range of 560 to 620 nm. Examples of such dyes are shown below.

[0062]

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As the dye having an absorption in the wavelength range of 460 to 500 nm, methine, anthraquinone, quinone, diphenylmethane dye, triphenylmethane dye, xanthene dye, azo and azomethine compounds are preferably used. Examples of the methine series include cyanine series, merocyanine series, oxonol series, arylidene series, and styryl series. 460 to 500
Examples of dyes having absorption in the wavelength range of nm are shown below.

[0064]

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As the dye having absorption in the wavelength range of 380 to 440 nm, methine, anthraquinone, quinone, diphenylmethane dye, triphenylmethane dye, xanthene dye, azo and azomethine compounds are preferably used. Examples of the methine series include cyanine series, merocyanine series, oxonol series, arylidene series, and styryl series. 380 to 440
Examples of dyes having absorption in the wavelength range of nm are shown below.

[0066]

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Dyes having an absorption in the wavelength range of 640 to 780 nm include cyanine-based dyes, squarylium-based dyes, and the like.
Azomethine, xanthene, oxonol, azo, anthraquinone, triphenylmethane, xanthene, Cu-phthalocyanine, phenothiazine or phenoxazine compounds are preferably used. Examples of dyes having absorption in the wavelength range of 640 to 780 nm are shown below.

[0068]

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For the filter layer, two or three or more dyes having the same or different wavelength absorption ranges as described above can be used in combination.

(Binder) The filter layer preferably contains a suitable binder in addition to the dye, and particularly preferably contains a polymer binder. Natural polymers (eg,
Use of gelatin, cellulose derivatives, alginic acid) or synthetic polymers (eg, polymethyl methacrylate, polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl chloride, styrene-butadiene copolymer, polystyrene, polycarbonate, water-soluble polyamide) as the polymer binder Can be.
Particularly preferred are hydrophilic polymers (the above-mentioned natural polymers, polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl alcohol, and water-soluble polyamide).

(Undercoat layer) In the present invention,
The hard coat layer, antireflection layer, filter layer,
An infrared shielding layer and an electromagnetic wave shielding layer can be provided on the support. In this case, between the support and these functional layers, 1
One or more subbing layers can be provided. The undercoat layer has an elastic modulus at 25 ° C. of 1000 MP
a 1 MPa or more, preferably 800 MPa or less, 5 MPa or more,
More preferably, a soft polymer of 500 MPa or less and 10 MPa or more is preferred. The thickness is preferably 2 nm or more and 20 μm or less, more preferably 5 nm or more and 5 μm or less, and most preferably 50 nm or more and 1 μm or less. Preferred polymers used in the subbing layer of the invention are vinyl chloride, vinylidene chloride, vinyl acetate, butadiene, neoprene, styrene, chloroprene, acrylates, methacrylates, acrylonitrile or methyl vinyl ether alone. It is a copolymer obtained by polymerization or copolymerization of two or more monomers selected from the group consisting of these vinyl monomers.

(Anti-reflection layer) The anti-reflection layer means a layer having a regular reflectance of 3.0% or less, and preferably a layer having a regular reflectance of 1.8% or less. It is usually useful to provide a low refractive index layer as the antireflection layer. The refractive index of the low refractive index layer is lower than the refractive index of the transparent support. The refractive index of the low refractive index layer is preferably from 1.20 to 1.55, more preferably from 1.30 to 1.50. The thickness of the low refractive index layer is 50 to 400 nm.
Or less, more preferably 50 to 200 nm. The low refractive index layer is a layer made of a fluorine-containing polymer having a low refractive index (JP-A-57-3452).
No. 6, JP-A-3-130103 and 6-115023
And JP-A-8-313702 and JP-A-7-168004), and a layer obtained by a sol-gel method (Japanese Unexamined Patent Publication No.
No. 208811, No. 6-299091, No. 7-168
No. 003) or a layer containing fine particles (JP-B-60-59250, JP-A-5-13021, JP-A-6-56478, JP-A-7-92306, and 9-288).
No. 201). In the layer containing fine particles, voids can be formed in the low refractive index layer as microvoids between the fine particles or in the fine particles. The layer containing fine particles preferably has a porosity of 3 to 50% by volume, more preferably 5 to 35% by volume.

To prevent reflection in a wide wavelength range,
It is preferable to laminate a layer having a high refractive index (middle / high refractive index layer) in addition to the low refractive index layer. The middle / high refractive index layer is a layer having a higher refractive index than the undercoat layer of the present invention.
By using the high refractive index layer together, a high antireflection effect can be obtained in a wider range than when only the low refractive index layer is used. The refractive index of the high refractive index layer is preferably from 1.65 to 2.40, and more preferably from 1.70 to 2.20. The refractive index of the middle refractive index layer is adjusted to be an intermediate value between the refractive index of the low refractive index layer and the refractive index of the high refractive index layer. The refractive index of the middle refractive index layer is preferably 1.50 to 1.90. The thickness of the middle / high refractive index layer is preferably 5 nm to 100 μm,
More preferably, the thickness is 0 nm to 10 μm.
Most preferably, it is 0 nm to 1 μm. The haze of the middle / high refractive index layer is preferably 5% or less,
It is more preferably at most 3%, most preferably at most 1%. The middle / high refractive index layer can be formed using a polymer having a relatively high refractive index.
Examples of high refractive index polymers include polystyrene, styrene copolymers, polycarbonates, melamine resins, phenolic resins, epoxy resins, and polyurethanes obtained by reacting cyclic (alicyclic or aromatic) isocyanates with polyols. . Other polymers having a cyclic (aromatic, heterocyclic, alicyclic) group and polymers having a halogen atom other than fluorine as a substituent also have a high refractive index. A polymer may be formed by a polymerization reaction of a monomer capable of radical curing by introducing a double bond.

In order to obtain a higher refractive index, inorganic fine particles may be dispersed in a polymer binder. The refractive index of the inorganic fine particles is preferably from 1.80 to 2.80. The inorganic fine particles are preferably formed from a metal oxide or sulfide. Examples of metal oxides or sulfides include titanium dioxide (eg, rutile, rutile / anatase mixed crystals, anatase, amorphous structure), tin oxide, indium oxide, zinc oxide, zirconium oxide, and zinc sulfide. Titanium oxide, tin oxide and indium oxide are particularly preferred. The inorganic fine particles contain oxides or sulfides of these metals as main components and may further contain other elements. The main component means a component having the largest content (% by mass) among the components constituting the particles. Examples of other elements include Ti, Zr, Sn, Sb, Cu, Fe, M
n, Pb, Cd, As, Cr, Hg, Zn, Al, M
g, Si, P and S are included. Inorganic materials that are film-forming and can be dispersed in solvents or are themselves liquid, such as alkoxides of various elements, salts of organic acids, coordination compounds (eg, chelate compounds) combined with coordination compounds, activity The middle / high refractive index layer can be formed using an inorganic polymer.

(Electromagnetic Wave Shielding Layer and Infrared Shielding Layer) In the present invention, the layer having an electromagnetic wave shielding effect has a surface resistance of 0.5.
It is 0.01 to 500 Ω / □, more preferably 0.01 to 10 Ω / □. To provide an electromagnetic wave shielding effect,
It is preferable to use a transparent conductive layer so as not to lower the visible light transmittance of the front plate. As the transparent conductive layer, a metal layer,
Examples include a metal oxide layer and a conductive polymer layer. Examples of the metal forming the transparent conductive layer include silver, palladium, gold, platinum, rhodium, aluminum, iron, cobalt, nickel, copper, zinc, ruthenium, tin, tungsten, iridium, lead alone and alloys thereof. But preferably silver, palladium, gold,
Platinum, rhodium alone or an alloy thereof. Here, an alloy of silver and palladium is preferable, and the content of silver is preferably 60% to 99%, and more preferably 80% to 98%.
% Is more preferred. The thickness of the metal layer is preferably 1 to 100 nm, more preferably 5 to 40 nm, and more preferably 10 to 30 nm.
Is most preferred. If the film thickness is less than 1 nm, the electromagnetic wave shielding effect is poor, and if it exceeds 100 nm, the transmittance of visible light decreases. Examples of the metal oxide forming the transparent conductive layer include tin oxide, indium oxide, antimony oxide, zinc oxide, ITO, and ATO. This film thickness is preferably from 20 to 1000 nm. More preferably, it is 40 to 100 nm. It is also preferable to use the metal transparent conductive layer and the oxide transparent conductive layer together. It is also preferable that a metal and a conductive metal oxide coexist in the same layer. A transparent oxide layer can be laminated to protect the metal layer, prevent oxidative deterioration, and increase visible light transmittance. This transparent oxide layer may or may not be conductive. Examples of the transparent oxide layer include thin films of oxides of divalent to tetravalent metals, zirconium oxide, titanium oxide, magnesium oxide, silicon oxide, aluminum oxide, and metal alkoxide compounds. The method for forming the transparent conductive layer and the transparent oxide layer is not particularly limited, and any processing method can be selected. For example, any known technique such as a sputtering method, a vacuum deposition method, an ion plating method, a plasma CVD method or a PVD method, and application of ultrafine particles of a corresponding metal or metal oxide can be used. As another method for providing an electromagnetic wave shielding effect, there is a method using a metal mesh. This is a metal in which a thin metal is arranged in a grid pattern on the entire surface of the support, and is slightly inferior in transparency to the transparent conductive layer, but has excellent conductivity and excellent electromagnetic wave shielding ability. This method can be used alone or in combination with the transparent conductive layer, and the electromagnetic wave shielding ability can be adjusted according to the purpose.

The infrared shielding effect in the present invention is 80%.
It refers to the function of blocking a line spectrum in the near infrared region from 0 to 1200 nm. As for the line spectrum shielding characteristics in the near infrared region, the transmittance at 800 nm is preferably 15% or less, and the transmittance at 850 nm is preferably 5% or less. To impart this infrared shielding effect, a method of mixing a near infrared absorbing compound with a transparent plastic support can be used. For example, a resin composition containing a copper atom (JP-A-6-118228), a resin composition containing a copper compound and a phosphorus compound (JP-A-62-5190), a copper compound, and a thiourea derivative are contained. It can be easily produced by forming a resin composition (JP-A-6-73197) and a resin composition containing a tungsten-based compound (US Pat. No. 3,647,729). As another method, similarly to the visible filter layer, there is a method of forming an infrared shielding filter layer using a dye (dye or pigment). As the dye having absorption in the near infrared region, a cyanine compound is preferably used. Examples of dyes having an absorption maximum in a wavelength range of about 800 nm to 1200 nm are shown below.

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The method of forming silver in a transparent state is inexpensive and preferable as a method of providing an infrared ray shielding effect in addition to the electromagnetic wave shielding. The near-infrared shielding layer can be used in combination of two or three or more means having the same or different wavelength absorption ranges described above.

(Inorganic Glass Substrate) The thickness of the inorganic glass substrate used for the front plate of the present invention is preferably 1 mm to 5 mm, more preferably 1.5 mm to 4.5 mm, and preferably 2 mm.
Most preferably, m to 4 mm. As a material, tempered glass is preferable from the viewpoint of protecting the panel body and the viewpoint of safety. (Other layers) In the present invention, a lubricating layer, an antifouling layer, an antistatic layer or an intermediate layer may be provided. A lubrication layer may be formed on the outermost surface of the antireflection film. The lubricating layer has a function of imparting lubricity to the surface of the antireflection film and improving scratch resistance. The lubricating layer can be formed using polyorganosiloxane (eg, silicone oil), natural wax, petroleum wax, higher fatty acid metal salt, fluorine-based lubricant or a derivative thereof. The thickness of the lubricating layer is 2 to 20 nm
It is preferred that Alternatively, an antifouling layer can be provided on the outermost surface of the antireflection film. The antifouling layer lowers the surface energy of the antireflection layer and makes it difficult to adhere to hydrophilic and lipophilic stains. In addition, the antifouling layer can be formed using a fluorine-containing polymer. The thickness of the antifouling layer is 2 nm to 100 nm, preferably 5 nm to 30 nm.

In the present invention, the surface can be provided with an anti-glare function (a function of scattering incident light on the surface to prevent a scene around the film from being reflected on the film surface). For example, an anti-glare function is obtained by forming fine irregularities on the surface of a transparent film, and forming an anti-reflection layer on the surface, or forming an anti-reflection layer, and then forming the irregularities on the surface with an embossing roll. be able to. An anti-reflection layer having an anti-glare function is generally 3
It has a haze of -30%.

The antireflection layer (low refractive index layer), filter layer, infrared ray or electromagnetic wave shielding layer, undercoat layer, hard coat layer, lubricating layer, antifouling layer, and other layers are formed by a general coating method. be able to. Examples of the coating method include dip coating, air knife coating, curtain coating, roller coating, wire bar coating, gravure coating, and extrusion coating using a hopper (US Pat. No. 2,681,294). (Described in the specification). Two or more layers may be formed by simultaneous coating. No. 2,761, U.S. Pat.
No. 791, No. 2, 941, 898, No. 3, 508, 9
No. 47, 3,526, 528, and in Yuji Harazaki, "Coating Engineering", p. 253 (published by Asakura Shoten in 1973). The method for forming the antireflection layer and the infrared or electromagnetic wave shielding layer in the present invention includes a sputtering method, a vacuum evaporation method, an ion plating method,
The plasma CVD method or the PVD method can be appropriately selected according to the improvement of the heat resistance of the transparent support.

In the present invention, the constituent materials of the invention (for example, the type of the material of the support, the type of the dye, the material of the undercoat layer, the material of the infrared or electromagnetic wave shielding layer, and the low refractive index polymer for the antireflection layer) And two or more selected from various characteristics (e.g., transmittance of a visible filter, surface resistance of an electromagnetic wave shielding layer, infrared transmittance of an infrared shielding layer, elastic modulus range of an undercoat layer, etc.). Preferred construction materials or combinations of properties can also be used as preferred embodiments of the present invention.

(Applications of Optical Filter and Front Plate of the Present Invention) The optical filter and front plate of the present invention can be used for a liquid crystal display (LCD) and a plasma display panel (PD).
P), electroluminescent display (EL)
D) or an image display device such as a cathode ray tube display device (CRT). Particularly when the optical filter and the front plate of the present invention are used as an optical filter and a front plate of a plasma display panel (PDP) and a cathode ray tube display (CRT), a remarkable effect is obtained. A plasma display panel (PDP) includes a gas, a glass substrate, an electrode, an electrode lead material, a thick film printing material, and a phosphor. There are two glass substrates, a front glass substrate and a rear glass substrate. An electrode and an insulating layer are formed on two glass substrates. A phosphor layer is further formed on the rear glass substrate. Two glass substrates are assembled, and gas is sealed between them. The optical filter and the front plate are located on the front of the main body of the plasma display so as to protect the main body. It is preferable that the optical filter and the front plate have sufficient strength to protect the main body. The optical filter and the front plate of the present invention can be used with a gap from the plasma display main body, or can be used by directly attaching to the plasma display main body. Plasma display panels (PDPs) are already commercially available. The plasma display panel is described in JP-A-5-205643 and JP-A-9-306366.

Hereinafter, the present invention will be further described with reference to Examples, but the present invention is not limited thereto.

[0085]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 1. Production of Hard Coat and Antireflective Transparent Support 1-1. Polymerization of polyester (a) Polyethylene terephthalate (PET) 80 parts of dimethyl terephthalate, 58 parts of ethylene glycol, 0.029 part of manganese acetate tetrahydrate, and 0.028 part of antimony trioxide were added, and stirred.
Heated to ° C. 235 while removing by-product methanol
The temperature was raised to ° C. After the by-product of methanol was completed, 0.03 part of trimethylphosphoric acid was added, and the pressure was reduced to 0.3 Torr while the temperature was raised to 285 ° C. to polymerize PET having an intrinsic viscosity of 0.62. In addition, these intrinsic viscosities were measured by the following method. Phenol / 1,1,2,2-tetrachloroethane mixed solvent
(Weight ratio: 60/40)
Make solutions of g / dl, 0.6g / dl and 1.0g / dl. This is measured at 20 ° C. using an Ubbelohde viscometer. The viscosity was plotted against the concentration, and the viscosity extrapolated to the concentration = 0 was defined as the intrinsic viscosity.

1-2. Kneading of Fine Particles An oligomer of PET having an intrinsic viscosity shown in Table 1 was prepared by shortening the polymerization time by the above method. This was added to the fine particles as shown in Table 1 so that the weight ratio of oligomer to fine particles was 1:10, and the mixture was kneaded at 230 ° C. for 5 minutes using a Banbury mixer. The mixture of the oligomer and the fine particles thus obtained was mixed with a P2 having an intrinsic viscosity of 0.62.
ET (pellet 4) was dried at 150 ° C. for 30 minutes, and added so that the content of fine particles became the value shown in Table 1. Then, the temperature was increased from 280 ° C. to 320 ° C. using a single screw kneading extruder. Kneaded for 5 minutes. This was extruded into noodles, then cooled with water and cut to form pellets (pellet 1).
~ 3).

[0087]

[Table 1] Dispersion of fine particles

1-3. Polyester film formation The polyester pellets prepared by the above method were dried at 160 ° C for 3 hours. The pellets of each composition were melted at 310 ° C. with an extruder so that the composition shown in Table 2 was obtained.
After filtering through a μm mesh filter, an unstretched film was extruded from a T-die (multi-manifold die) onto a casting drum to which static electricity at 50 ° C. was applied.

[0097] The resulting film was stretched in the MD (3.5 times, 105 ° C) and TD stretched (4.0 times,
110 ° C.), heat setting (245 ° C.), and thermal relaxation (3%). The width of the film was 1.8 m, which was trimmed to 1.5 m at both ends.
After a knurling process with a width of 10 mm and a width of 10 mm, it was wound up into a core having a diameter of 30 cm by 3000 m.

[0090]

[Table 2] Film forming conditions and surface elastic modulus

1-4. Preparation of Inorganic Particle Dispersion (M-1) The following amounts of each reagent were weighed in a ceramic-coated vessel. Cyclohexanone 337 g PM-2 (phosphate group-containing methacrylate manufactured by Nippon Kayaku Co., Ltd.) 31 g AKP-G015 (Alumina manufactured by Sumitomo Chemical Co., Ltd .: particle size: 15 nm) 92 g The above mixture was sand-milled (1 / (4G sand mill) at 1600 rpm for 10 hours. Media is 1
1400 g of zirconia beads having a diameter of mmΦ was used. After dispersion, the beads were separated and the surface-modified alumina (M-1)
I got

1-5. Preparation of Coating Liquid for Active Energy Beam Cured Layer To 116 g of a 43% by mass cyclohexanone dispersion liquid (M-1) of surface-treated alumina fine particles, 97 g of methanol was added.
163 g of isopropanol and 163 g of methyl isobutyl ketone were added. A mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA, manufactured by Nippon Kayaku Co., Ltd.)
200 g was added and dissolved. Further, 7.5 g of a photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy) and a photosensitizer (Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.)
5.0 g was added and dissolved. After stirring the mixture for 30 minutes, the mixture was filtered through a polypropylene filter having a pore size of 1 μm to prepare a coating liquid for an active energy ray-curable layer.

1-6. Preparation of Hard Coat Film After subjecting the base films described in Table 3 to glow discharge treatment, a coating liquid for an active energy ray-cured layer filled with alumina was applied and dried with a wire bar so that the dry film thickness became 8 μm. The cured layer was laminated by irradiation with ultraviolet rays.

1-7. Formation of low refractive index layer as anti-reflection layer 1.3 g of t-butanol was added to 2.50 g of a reactive fluoropolymer (JN-7219, manufactured by Nippon Synthetic Rubber Co., Ltd.)
The mixture was stirred at room temperature for 10 minutes and filtered with a 1 μm polypropylene filter. The obtained coating liquid for a low refractive index layer was applied on the hard coat layer using a bar coater so that the dry film thickness became 96 nm. The coating was dried and cured at 120 ° C. for 15 minutes to form a low-refractive-index layer, and a hard-coated transparent support having an upper surface provided with antireflection was prepared.

1-8. Pencil scratch hardness test The hardness of the pencil scratch test was examined. In the test, the prepared anti-reflection hard-coated transparent support was heated to
After humidifying for 2 hours under the condition of 60% relative humidity, JIS-
Using a test pencil specified by S-6006, JIS-
The measurement was performed according to the pencil hardness evaluation method specified by K-5400. The pencil hardness of the evaluation result is a value of a pencil hardness at which no scratch is recognized at a load of 9.8 N. The results are shown in Table 3.

[0096]

[Table 3] Composition and surface hardness of hard coat film

2. Preparation of transparent support coated with antireflection layer and filter layer 2-1. Formation of Undercoat Layer After corona treatment on both sides of a transparent biaxially stretched polyethylene terephthalate film having a thickness of 120 μm, a styrene-butadiene copolymer having a refractive index of 1.55, an elastic modulus of 100 MPa at 25 ° C., and a glass transition temperature of 37 ° C. Naru latex (LX407C, manufactured by Zeon Corporation)
5) was applied to form an undercoat layer. The film was dried so as to have a thickness of 300 nm on the surface on which the filter layer was to be provided and to have a thickness of 150 nm on the surface on which the low refractive index layer was to be provided.

2-2. Formation of a second undercoat layer On the undercoat layer on which the filter layer is to be provided, an aqueous gelatin solution containing acetic acid and glutaraldehyde is applied so as to have a thickness of 110 nm after drying, and the undercoat layer on which the antireflection layer is to be provided Acrylic latex (HA16, manufactured by Nippon Acrylic Co., Ltd.) having a refractive index of 1.50, an elastic modulus of 120 MPa at 25 ° C., and a glass transition temperature of 50 ° C. was applied on the top so as to have a dry thickness of 20 nm. A second undercoat layer was formed.

2-3. Formation of low refractive index layer as anti-reflection layer 1.3 g of t-butanol was added to 2.50 g of a reactive fluoropolymer (JN-7219, manufactured by Nippon Synthetic Rubber Co., Ltd.)
The mixture was stirred at room temperature for 10 minutes and filtered with a 1 μm polypropylene filter. The obtained coating liquid for a low refractive index layer was coated on one surface of a transparent support (a surface having a styrene-butadiene copolymer latex of 150 nm and an acrylic latex of 20 nm as an undercoating layer) with a dry film thickness of 96 using a bar coater.
and dried and cured at 120 ° C. for 15 minutes to form a low refractive index layer.

2-4. Formation of Visible and Near Infrared Filter Layer To 180 g of a 10% by mass aqueous solution of gelatin, dye (b7) was added.
0.05 g, dye (a2) 0.15 g, dye (d1)
Dissolve 0.06 g and 0.05 g of dye (f2),
After stirring at 40 ° C. for 30 minutes, the mixture was filtered through a 2 μm polypropylene filter. The obtained coating solution for a filter layer is applied on the second undercoat layer of the transparent support opposite to the side on which the low-refractive-index layer is applied, so that the dry film thickness becomes 3.5 μm. After drying for 10 minutes, a visible and near-infrared filter layer was formed, and a support provided with an antireflection layer and a visible and near-infrared filter layer was produced.

When the visible light spectral transmittance of the above support was examined, it had an absorption maximum at 535 nm and 595 nm, and the transmittance at the absorption maximum was 70% at 535 nm.
The absorption maximum at 95 nm was 25%. As for the half width of the absorption maximum, the absorption maximum at 535 nm was 71 nm, and the absorption maximum at 595 nm was 29 nm. The change in transmittance around 440 nm is sharp, and the transmittance at 445 nm is 75%.
% At 435 nm, about 11% at 430 nm
Met. T ₁ is about 33%.

3. Electromagnetic waves and infrared shielding layer on a transparent glass substrate, Coating of 3mm thick on the surface of the colorless transparent tempered glass plate of TiO ₂ and silver TiO ₂ / silver / TiO ₂ / silver / TiO ₂ sequence of the anti-reflection layer (Film thickness: 21/13/50/13/21 nm) and five layers were formed by sputtering. The surface resistance was 2.0Ω / □. When the reflectance of the antireflection film (and the electromagnetic wave and infrared shielding layer) was measured, the average reflectance in the wavelength range of 500 to 600 nm was 1.1%.

4. Coating of Hard Coat and Anti-Reflection Transparent Support on Electromagnetic Wave and Infrared Shielding Layer, Anti-Reflection Layer Five types of anti-reflection hard coats prepared in 1 (Invention 1-4, Comparative Example 1) the underside of a transparent support (hard coat layer side surface opposite) in the same manner as in 3 TiO ₂ and silver of TiO ₂
/ Silver / TiO ₂ / silver / TiO ₂ sequence (thickness 20/14 /
(49/14/21 nm) to form a five-layer film by sputtering. The surface resistance was 2.1Ω / □. When the reflectance of the antireflection film formed by this sputter film was measured, the average reflectance in the wavelength range of 500 to 600 nm was 1.
It was 0%.

5. Preparation of front plate An acrylic pressure-sensitive adhesive was applied to a thickness of 30 μm on the filter layer surface of the filter layer having an antireflection layer prepared in 2, and the antireflection layer of the glass transparent support prepared in 3 was formed by sputtering. Stuck on the surface. Five of these were produced.
Next, an acrylic pressure-sensitive adhesive having a thickness of 30 μm was applied to the back surface (opposite the antireflection layer) of the five types of antireflection hard-coated transparent supports (the surfaces opposite to the antireflection layer) prepared in 1 above (the inventions 1 to 4 and Comparative Example 1).
5 layers with anti-reflection layer, visible filter layer, electromagnetic wave and infrared ray shielding layer, and hard coat layer attached on the glass surface opposite to the surface on which the filter layer was attached. Was produced.

6. Production of optical filter for direct application
An acrylic pressure-sensitive adhesive was applied to a thickness of 30 μm on the back surface of a transparent support provided with an anti-reflection layer (also used as an electromagnetic wave and infrared ray shielding layer) on the back surface, and a filter layer coated transparent prepared in 2 was prepared. The support was bonded to the filter layer side. However, the transparent support coated with the filter layer used was not provided with a low refractive index layer on the opposite side of the filter layer.

7. Evaluation of color of front panel and filter function 7-1. Evaluation of tint Remove the front panel of the plasma display (PDS4202J-H, manufactured by Fujitsu General Co., Ltd.), and turn the front panel prepared in step 5 with the filter layer with the anti-reflection layer attached to the plasma display body side Attached. Thus, the color of the front surface of the plasma display having the front plate was measured with a spectroradiometer (SR-2A, manufactured by Topcon Corporation). Both front plates have a * of -1.1 to 4.7,
b * was in the range of -7.0 to -2.8, and it appeared achromatic even by visual evaluation.

7-2. Evaluation of filter function The electromagnetic wave and near-infrared shielding layer are connected to the metal ground on the back of the plasma display panel, and the voltage induced in the electromagnetic wave and near-infrared shielding layer by the electromagnetic wave radiated from the plasma display panel is conducted to the ground. Functional evaluation was performed. As evaluation items, measurement of electromagnetic wave and infrared ray shielding ability, contrast of a displayed image, and evaluation of color reproducibility by visual observation were performed. Each of the front plates has an electromagnetic wave shielding ability of at least 9 dB or more in a frequency range of 10 MHz to 200 MHz, and has achieved an external leakage level of electromagnetic waves regulated by an information processing device or the like. Further, the line spectrum shielding ability in the near infrared region is 800 nm.
At about 850 nm, and 3% or less at 850 nm, and it was possible to prevent interference with infrared remote control devices installed in the vicinity. In addition, the contrast and the visual color reproducibility were also significantly improved. The contrast was 10: 1 before exchanging the front panel, but was 15: 1 in each of the evaluated front panels. In each case, it was confirmed that the orange-containing red was improved to pure red, the greenish blue to vivid blue, and the yellowish white to pure white compared to before replacing the front panel.

8. Evaluation of color and filter function of optical filter for direct application 8-1. Attaching Directly to Panel Main Body An acrylic pressure-sensitive adhesive was applied to a thickness of 30 μm on the transparent support opposite to the antireflection layer of the five types of optical filters for direct attachment prepared in 6. Next, a plasma display (PDS4202J-H, Fujitsu General Limited)
Was removed and directly attached to the plasma display panel body via an adhesive.

8-2. Evaluation of color The color of the front of the plasma display on which the optical filter was directly attached in this manner was measured using a spectroradiometer (Topcon SR-
2A). In each optical filter surface, a * was in the range of -1.0 to 4.5 and b * was in the range of -7.4 to -2.2.

8-3. Evaluation of filter function The electromagnetic wave and near-infrared shielding layer are connected to the metal ground on the back of the plasma display panel, and the voltage induced in the electromagnetic wave and near-infrared shielding layer by the electromagnetic wave radiated from the plasma display panel is conducted to the ground. Functional evaluation was performed. As evaluation items, measurement of electromagnetic wave and infrared ray shielding ability, contrast of a displayed image, and evaluation of color reproducibility by visual observation were performed. Each optical filter has an electromagnetic wave shielding ability at a frequency of 10 MHz to 200 M.
A minimum of 9 dB or more was obtained in the range of Hz, and the external leakage level of electromagnetic waves regulated by information processing devices and the like was achieved. The line spectrum shielding ability in the near infrared region is 80%.
It was about 9% at 0 nm and 4% or less at 850 nm, and it was possible to prevent interference with infrared remote control devices installed in the vicinity. In addition, the contrast and the visual color reproducibility were also significantly improved. The contrast was 6: 1 before the optical filter was directly attached with the front plate removed, but in each of the examples, the contrast was 12: 1. Before applying the optical filter directly, it was confirmed that red with orange was improved to pure red, greenish blue to vivid blue, and yellowish white to pure white.

[Brief description of the drawings]

FIG. 1 is a conceptual cross-sectional view when a front plate of the present invention is used on the front surface of a main body 1 of a cathode ray tube display (CRT) or a plasma display panel (PDP). FIG. 1A shows a case where an optical filter is directly attached to the main body 1, and FIG. It is a conceptual diagram.

FIG. 2 is a schematic sectional view of a layer configuration of a front plate. Fig. 2 (a)
2 (b) is the same as FIG. 1 (a), FIG. 2 (c) and FIG.
Is an example of a layer configuration corresponding to the arrangement of FIG.

FIG. 3 is a conceptual sectional view of an embodiment of a hard coat portion according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 CRT or PDP 2 Support 3 Optical filter consisting of various filter layers and antireflection layer or its part 4 Front plate 11 Antireflection layer 12 Electromagnetic wave and infrared ray shielding layer 13 Hard coat layer 14 Plastic transparent support 15 Filter layer 16 Glass Transparent support 21 Transparent substrate (layer A) 22 Transparent substrate (layer B) 23 Active energy ray-curable resin layer

Continued on the front page F term (reference) 2H048 CA04 CA05 CA12 CA14 CA15 CA19 CA24 CA29 2K009 AA15 BB02 BB24 CC02 CC03 CC09 CC21 CC42 DD02 DD05 EE03 FF02 4F100 AA00C AA00D AA00H AA19C AA19H AA20C AA20AAAAAAAAAAAAAAAAC AR00A AR00B AR00D AS00B BA04 BA05 BA07 BA10A BA10D CA13B CA23C CA23D DE01C DE01D DE01H EJ64C EJ64H GB41 JB14C JD08 JK12C JK12H JL10 JN01A JN01D JN08B YY00C YY00D 5C058 AA DAA

Claims (16)

[Claims] 1. A transparent support comprising one or more layers, a visible filter layer comprising a dye or pigment and a binder, and a hard coat layer comprising an active energy ray polymerizable resin layer. An optical filter, wherein the surface elastic modulus of the transparent support on the surface provided is 4 GPa or more and 15 GPa or less. 2. The optical filter according to claim 1, wherein the transparent support on the surface provided with the hard coat layer is a polyester film containing 10% by mass to 60% by mass of inorganic fine particles of 1 nm to 400 nm. 3. The polyester support (A layer) comprising a layer (B layer) in which the transparent support on the surface provided with the hard coat layer contains 10% by mass to 60% by mass of inorganic fine particles having a thickness of 1 nm to 400 nm. 3. The optical filter according to claim 1, which is a film laminated on one side. 4. The transparent support provided with the hard coat layer has a total layer thickness (the sum of the thickness of the layer A and the thickness of the layer B) of 50 μm to 300 μm, and the thickness of the layer B is 1 μm to 1 μm.
The optical filter according to claim 3, which has a thickness of not more than 00 µm. 5. The optical filter according to claim 1, wherein the polyester film is made of a polyethylene terephthalate resin or a polyethylene naphthalate resin. 6. The active energy ray-polymerizable resin layer contains inorganic fine particles having a Mohs hardness of 6 or more and a particle size of 1 nm or more and 400 nm or less.
The optical filter according to any one of the above. 7. The active energy ray-polymerizable resin layer comprises a binder polymer obtained by crosslinking inorganic fine particles and a polyfunctional acrylate compound, wherein the inorganic fine particles are at least one of aluminum oxide, silicon dioxide, titanium dioxide and zirconium oxide. The optical filter according to any one of claims 1 to 6, further comprising: 8. The inorganic fine particles contained in the active energy ray polymerizable resin layer are subjected to a surface treatment, and the surface treatment is performed by using an active energy ray curable group and any one of a phosphoric acid group, a sulfonic acid group and a carboxylic acid group. The optical filter according to any one of claims 1 to 7, wherein the optical filter is an organic compound having an anionic functional group or an organic metal compound containing at least one of aluminum, titanium, and zirconium. 9. The method according to claim 8, wherein the visible filter layer is 560 to 62.
9. The optical filter according to claim 1, which has an absorption maximum having a transmittance of 0.01 to 50% in a wavelength range of 0 nm. 10. The method according to claim 10, wherein the visible filter layer is 560 to 6
10. An absorption maximum having a transmittance of 0.01 to 50% in a wavelength range of 20 nm and having an average transmittance of 70% or less in a wavelength range of 380 to 440 nm.
The optical filter according to any one of the above. 11. The method according to claim 11, wherein said visible filter layer is 500 to 5
11. The method according to claim 1, wherein the absorption maximum has a transmittance of 20 to 85% in a wavelength range of 50 nm and the absorption maximum has a transmittance of 0.01 to 50% in a wavelength range of 560 to 620 nm. Optical filter. 12. The visible filter layer according to claim 5, wherein
It has an absorption maximum having a transmittance of 20 to 85% in a wavelength range of 50 nm and an absorption maximum of 0.01 to 50% in a wavelength range of 560 to 620 nm.
The optical filter according to any one of claims 1 to 11, wherein an average transmittance in a wavelength range of 80 to 440 nm is 70% or less. 13. The visible filter layer may be 460 to 5
In both the wavelength range of 00 nm and the wavelength range of 500 to 550 nm, the absorption maximum has a transmittance of 20 to 85%, and the transmittance is 0.2 in the wavelength range of 560 to 620 nm.
Having an absorption maximum of 01 to 50%, and having an average transmittance of 70% in a wavelength range of 380 to 440 nm.
The optical filter according to any one of claims 1 to 12, wherein: 14. An image display device using the optical filter according to claim 1. 15. A front plate of a plasma display panel using the optical filter according to any one of claims 1 to 13. 16. The image display device according to claim 14, which is a plasma display panel.