JP2007328092A - Optical filter, and display and plasma display panel equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical filter that is transparent, has excellent shock resistance, high surface hardness and excellent antireflection property and electromagnetic shielding property and is suitable for a PDP (plasma display panel). <P>SOLUTION: The optical filter includes a layered product comprising a first adhesive layer, a first transparent film having a functional layer, a second adhesive layer and a second transparent film having a functional layer provided in this order, and is characterized in that: the first adhesive layer has a storage modulus in a range of 1×10<SP>3</SP>to 1×10<SP>6</SP>Pa and a loss modulus in a range of 1×10<SP>3</SP>to 3×10<SP>5</SP>Pa at -10°C and 1 Hz frequency; and the second adhesive layer shows a storage modulus in a range of 1×10<SP>4</SP>to 1×10<SP>6</SP>Pa and a loss modulus in a range of 1×10<SP>4</SP>to 3×10<SP>6</SP>Pa at 25°C and 1 Hz frequency. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is applicable to various displays such as a plasma display panel (PDP), a cathode ray tube (CRT) display, a liquid crystal display, an organic EL (electroluminescent) display, and a field emission display (FED) including a surface electric field display (SED). The present invention relates to an optical filter having various functions such as antireflection, antistatic, and electromagnetic wave shielding, and a display provided with this optical filter, particularly a PDP.

  In the case of flat panel displays such as liquid crystal displays, plasma displays (PDP), EL displays, and CRT displays, it has been known that the light from the outside is reflected on the surface and the internal visual information is difficult to see. Various measures have been taken, such as the installation of an optical film including an antireflection film.

  In recent years, large-screen displays have become mainstream in displays, and PDPs have become common as next-generation large-screen display devices. However, in this PDP, high-frequency pulse discharge is performed on the light emitting unit for display. Therefore, there is a risk of unnecessary electromagnetic radiation and infrared radiation that may cause malfunction of an infrared remote controller. Have proposed various antireflection films for PDP (electromagnetic wave shielding light transmitting window material) having conductivity. As the conductive layer of this electromagnetic wave shielding light transmitting window material, for example, (1) a transparent film provided with a transparent conductive thin film containing metallic silver, and (2) a conductive mesh made of a metal wire or conductive fiber in a net shape are provided. Transparent film, (3) a layer of copper foil or the like on the transparent film is etched into a net-like shape, an opening is provided, and (4) a conductive ink is printed on the transparent film in a mesh shape, etc. Are known.

  Furthermore, in large displays such as conventional PDPs, various films such as antireflection films and near-infrared cut films are bonded together, so that they can play a role in preventing scattering even if the panel glass breaks. However, it is not sufficient, and it has become necessary to meet requirements in safety standards such as having a mitigation function against impact from the viewing surface side.

For example, Patent Document 1 discloses a PDP filter having an adhesive layer for reducing the impact. Patent Document 1 proposes an adhesive layer having a dynamic storage elastic modulus of 9 × 10 ⁴ to 4 × 10 ⁶ Pa under conditions of 25 ° C. and 1000 to 10000 Hz.

JP-A-2005-23133

  According to the study by the present inventors, a PDP filter having an antireflection film and an electromagnetic wave shielding layer was prepared using the above-mentioned adhesive layer, a glass plate of PDP was attached, and an impact resistance test was conducted. If the film surface is too high, sufficient performance may not be obtained, and even if it is excellent for impact resistance testing, the pencil hardness on the film surface is not sufficiently high, and the filter surface is scratched during use of the PDP. It has become clear that there are cases where the display characteristics of the filter may deteriorate, or that the filter is too soft and difficult to peel off when the filter is applied by mistake during manufacture.

  Accordingly, an object of the present invention is to provide an optical filter suitable for a display that is transparent, excellent in impact resistance, and has a high surface hardness.

  Another object of the present invention is to provide an optical filter suitable for a PDP that is transparent, has excellent impact resistance, has high surface hardness, and has excellent antireflection properties and electromagnetic shielding properties.

  Furthermore, an object of the present invention is to provide a display in which the optical filter having the excellent characteristics is bonded to the surface of an image display glass plate.

  Furthermore, an object of the present invention is to provide a PDP in which the optical filter having the excellent characteristics is bonded to the surface of an image display glass plate.

  The optical filter is generally produced by laminating and laminating various functional films to each other. However, the inventor has excellent impact resistance and high surface hardness (eg, hardly damaged). As a result of repeated studies to obtain various functional films, at least two adhesive layers are used, and the adhesive layer in contact with or close to the display side has a storage elastic modulus at a frequency of 1 Hz at -10 ° C and The above optical filter is obtained by setting the dynamic loss elastic modulus within a specific range, and setting the adhesive layer far from the display to have a storage elastic modulus and loss elastic modulus at a frequency of 1 Hz at 25 ° C. I found that I could do it.

  That is, the present inventor has determined the number of adhesive layers and the respective elastic moduli in order to maintain the “durability against a daily impact required for an optical filter” and the “surface hardness” in a favorable characteristic range. As a result of detailed investigation on the range, it is clear that the above-mentioned good characteristics can be obtained by using at least two adhesive layers and appropriately setting the elastic modulus at 25 ° C. and −10 ° C. at a strain frequency of 1 Hz. It became.

Therefore, the present invention
An optical filter comprising a laminate comprising a first adhesive layer, a first transparent film having a functional layer, a second adhesive layer, and a second transparent film having a functional layer in this order. And
The first adhesive layer has a storage elastic modulus in a range of 1 × 10 ³ to 1 × 10 ⁶ Pa at a frequency of 1 Hz at −10 ° C. and a loss elastic modulus of 1 × 10 ^{3 to} 3 × 10 ⁵ Pa. The storage elastic modulus of the second adhesive layer at a frequency of 1 Hz at 25 ° C. is in the range of 1 × 10 ⁴ to 1 × 10 ⁶ Pa, and the loss elastic modulus is 1 × 10 ^{4 to} 3 ×. An optical filter in the range of 10 ⁶ Pa;
It is in.

  When the storage elastic modulus (dynamic storage elastic modulus) in the first adhesive layer is less than the lower limit of the above range, the adhesive layer is too soft and the filter surface hardness decreases, and the stress for deformation becomes too small. Insufficient restoring force, and when applied by mistake, it is difficult to peel off and inferior in handling properties. On the other hand, if it exceeds the upper limit of the above range, it is too hard and the stress for deformation becomes too large, and the adhesive layer is less susceptible to impact. Insufficient performance. The same can be said for the loss elastic modulus (dynamic loss elastic modulus). Furthermore, for the second adhesive layer, if the storage elastic modulus is less than the lower limit of the above range, the adhesive layer is too soft, the stress for deformation becomes too small, the restoring force is insufficient, and it is pasted by mistake. At this time, peeling is difficult and the handling property is inferior. On the other hand, if it exceeds the upper limit of the above range, it is too hard and stress for deformation becomes too large, and the relaxation performance against the impact of the adhesive layer is insufficient. The same applies to the loss modulus.

  In the present invention, the storage elastic modulus and the loss elastic modulus are measured using a RDA3 (manufactured by Rheometric Scientific Co.) as a viscoelasticity measuring device, and a measurement thickness of 1.0 mm with a parallel disk-shaped jig of φ = 8 mm. And measured at a temperature dispersion range of −60 to 100 ° C., a heating rate of 2 ° C./min, and a frequency of 1 Hz.

Preferred embodiments of the optical filter (generally an optical film) of the present invention are as follows.
(1) A third transparent film that may have a third adhesive layer and a functional layer between the first transparent film having a functional layer and the second adhesive layer is a third transparent film. The adhesive layer is provided in contact with the first transparent film, and the third transparent film is positioned thereon,
The third adhesive layer has a storage elastic modulus in the range of 1 × 10 ⁴ to 1 × 10 ⁶ Pa at a frequency of 1 Hz at 25 ° C. and a loss elastic modulus in the range of 1 × 10 ^{4 to} 3 × 10 ⁶ Pa. It is in.

By providing a third transparent film which may have a third adhesive layer and a functional layer, the impact resistance and surface hardness characteristics are further improved.
(2) The storage modulus of the first adhesive layer at a frequency of 1 Hz at −10 ° C. is in the range of 1 × 10 ⁴ to 1 × 10 ⁵ Pa and the dynamic loss modulus is 5 × 10 ³ to 1 It is in the range of × 10 ⁵ Pa. The impact resistance and surface hardness characteristics are further improved.
(3) The storage elastic modulus of the second adhesive layer at a frequency of 1 Hz at 25 ° C. is in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa, and the loss elastic modulus is 5 × 10 ^{4 to} 5 × 10 ^5. It is in the range of Pa. The impact resistance and surface hardness characteristics are further improved.
(4) The storage elastic modulus of the third adhesive layer at a frequency of 1 Hz at 25 ° C. is in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa, and the loss elastic modulus is 5 × 10 ^{4 to} 5 × 10 ^5. It is in the range of Pa. The impact resistance and surface hardness characteristics are further improved.
(5) The value of the storage elastic modulus of the second adhesive layer is larger than the value of the storage elastic modulus of the first adhesive layer, or even when it is the same or smaller, it is small in the range of 9 × 10 ³ Pa or less, and Even when the value of the loss elastic modulus of the second adhesive layer is greater than, equal to or smaller than the value of the loss elastic modulus of the first adhesive layer, it is small in the range of 5 × 10 ³ Pa or less. This further improves the impact resistance and surface hardness characteristics.
Further, even when the storage elastic modulus value of the third adhesive layer is larger than, equal to, or smaller than the storage elastic modulus value of the first adhesive layer, it is small in the range of 9 × 10 ³ Pa or less, and The loss elastic modulus value of the adhesive layer ³ is smaller than the value of the loss elastic modulus value of the first adhesive layer, or even when it is the same or smaller, it is small in the range of 5 × 10 ³ Pa or less. This further improves the impact resistance and surface hardness characteristics.
(6) The first functional layer is generally a conductive layer, an antireflection film (generally including a hard coat layer), or a near-infrared shielding layer, and is preferably a conductive layer.

The second functional layer is generally a conductive layer, an antireflection film (generally including a hard coat layer), or a near-infrared shielding layer, but the second functional layer is preferably an antireflection film.
(7) The functional layer of the first transparent film is in contact with the second adhesive layer. When the functional layer of the first transparent film is a mesh-like metal layer, the first adhesive layer can be embedded in the mesh gap.
(8) When it has a 3rd transparent film, the functional layer of the 1st transparent film and the 3rd adhesion layer have touched.
(9) The adhesive layer is made of an acrylic resin.
(10) The monomer constituting the acrylic resin contains at least alkyl acrylate (however, the alkyl group has 4 to 10 carbon atoms) and acrylic acid. It is preferable that at least 2-ethylhexyl acrylate and acrylic acid are contained as a monomer constituting the acrylic resin. As a monomer constituting the acrylic resin, trimethylolpropane triacrylate is further included. As a monomer constituting the acrylic resin, 2-hydroxylethyl methacrylate or N-methylolacrylamide is further included. In particular, it is preferable that trimethylolpropane triacrylate is further included as a monomer constituting the acrylic resin used in the first adhesive layer, and / or alkoxy-polyalkylene glycol (meth) acrylate and hydroxyl group-containing (meta ) It is preferable to contain an acrylate. Moreover, it is preferable that 2-hydroxylethyl methacrylate or N-methylol acrylamide is further included as a monomer which comprises the acrylic resin used for the 2nd or 3rd adhesion layer.

By using such an acrylic resin, it is easy to design a resin having the specific storage elastic modulus and loss elastic modulus. Further, this absorbs the impact and easily returns to the shape before the deformation from the deformation due to the impact.
(11) The adhesive layer cures a partial polymer / monomer mixture obtained by partially polymerizing a monomer mixture containing alkyl acrylate (wherein the alkyl group has 4 to 10 carbon atoms) and acrylic acid. Layer.
(12) The layer thickness of the first adhesive layer is in the range of 0.05 to 1.0 mm, and the layer thicknesses of the second and third adhesive layers are in the range of 0.005 to 0.1 mm. Excellent impact resistance and surface hardness are easily obtained.
(13) The functional layer of the third transparent film which may have a functional layer is a near-infrared shielding layer.
(14) The transparent film which has a near-infrared shielding layer is provided in the surface which is not in contact with the 1st transparent film of a 1st adhesion layer. Generally, an adhesive layer is further provided on this transparent film.
(15) The antireflection film has a near-infrared shielding function. Generally, a substance that absorbs near-infrared rays such as a dye is introduced into at least one layer constituting the antireflection film.
(16) When the optical filter of the present invention is used for PDP, it is necessary that the conductive layer has an electromagnetic wave shielding function.
(17) The conductive layer is a mesh-like metal layer or a metal-containing layer. It is advantageous for PDP.
(18) The first adhesive layer is embedded in the mesh gap of the mesh-like metal layer.
(19) The transparent substrate is a plastic film, particularly a polyethylene terephthalate film (PET film). Continuous production becomes easy by using a long transparent film.
(20) A release sheet is provided on the transparent adhesive layer. Handling becomes easy.
(21) A protective layer (eg, protective polymer film) is provided on the antireflection film. Handling becomes easy.
(22) The light transmittance is 50% or more (preferably 70% or more). The image on the display is easy to see.
(23) The mesh-like metal layer or metal-containing layer is formed by etching or printing, or is a metal fiber layer. It is easy to obtain low resistance.
(24) The conductive layer is a coating layer. It is easy to form a conductive layer.

The conductive layer is preferably a coating layer in which conductive particles of an inorganic compound are dispersed in a polymer.
(25) The conductive layer is a conductive polymer coating layer.
(26) The conductive layer is a transparent film of a metal oxide layer such as ITO.
(27) The conductive layer is an alternately laminated film of dielectric layers and metal layers. In particular, a laminate of 5 layers or more of dielectric layer / metal layer / dielectric layer / metal layer / dielectric layer is preferable. Excellent transparency and low resistance.
(28) The antireflection film includes at least one coating layer. Easy to manufacture.
(29) A film comprising an antireflection film, a hard coat layer formed by coating, and a high refractive index layer formed by coating having a higher refractive index than the hard coat layer provided thereon, particularly a hard coat layer, A film including a high refractive index layer by coating and a low refractive index layer by coating is preferable.

  The optical filter of the present invention is preferably a plasma display panel filter.

  The suitable aspect of the said optical filter is applicable also to the said adhesion layer.

  Furthermore, the present invention also provides a display in which the optical filter is bonded to the surface of an image display glass plate.

  Furthermore, the present invention is also a plasma display panel characterized in that an optical filter is bonded to the surface of an image display glass plate.

The optical filter of the present invention is a filter excellent in antireflection, antistatic and electromagnetic wave shielding of a display, and excellent in impact resistance while maintaining high surface hardness. That is, the optical filter of the present invention includes at least two adhesive layers and two transparent films, and of the two adhesive layers, the first adhesive layer is stored at a frequency of −10 ° C. at a frequency of 1 Hz. The elastic modulus is in the range of 1 × 10 ³ to 1 × 10 ⁶ Pa, the loss elastic modulus is in the range of 1 × 10 ^{3 to} 3 × 10 ⁵ Pa, and the frequency of the second adhesive layer at 25 ° C. is 1 Hz. The storage elastic modulus is in the range of 1 × 10 ⁴ to 1 × 10 ⁶ Pa and the loss elastic modulus is in the range of 1 × 10 ^{4 to} 3 × 10 ⁶ Pa. On the other hand, it shows a relaxation effect, hardly damages the glass plate which is the display screen of the display, and the pencil hardness of the optical filter surface is improved, so that the filter surface is hardly damaged during use of the PDP. The display characteristics of the image will not deteriorate. There is not much. In addition, because it has both impact mitigating action and high surface hardness, it can be easily peeled off and re-applied even if the optical filter is attached to the display in the wrong position, and it is easy to handle. Yes.

  Furthermore, especially when a mesh-like metal layer is used as the conductive layer, the film surface provided with the metal layer is a rough surface. However, since the pressure-sensitive adhesive layer of the present invention has appropriate flexibility, it can also function as the transparent resin layer.

  The optical filter excellent in antireflection, antistatic and electromagnetic wave shielding of the present invention and further improved in impact resistance and surface hardness will be described in detail below. The present invention is an optical filter in which two transparent films having functional layers such as an antireflection film and a conductive layer and at least each adhesive layer are laminated.

  FIG. 1 shows a schematic sectional view of an example showing the basic configuration of the optical filter of the present invention. In FIG. 1, a conductive layer 12 is provided as a functional layer on one surface of the first transparent film 11A, and a first adhesive layer 13A is provided on the other surface. The antireflection film 14 is provided as a functional layer on the surface of the second transparent film 11B through the adhesive layer 13B. The functional layer may be a conductive layer, an antireflection film (only a hard coat layer may be used), a near-infrared shielding layer, or the like, but preferably has the configuration shown in FIG. Both functional layers provided on the first and second transparent films may be the same functional layer. When this optical filter is applied to the display glass surface of the display body, the first adhesive layer 13A is opposed to the glass surface and is adhered by this adhesive. Separately, another pressure-sensitive adhesive may be used. A release sheet may be provided on the first adhesive layer 13A.

  The antireflection film 14 is generally a composite film of a hard coat layer having a refractive index lower than that of the substrate and a low refractive index layer provided thereon, or a low refractive index layer is further provided on the high refractive index layer. Composite film. The antireflection film 14 is effective even if only a hard coat layer having a higher refractive index than that of a transparent film as a substrate or only a low refractive index layer. It is preferable from the viewpoint of productivity and economy that all of the layers constituting the antireflection film 14 are formed by coating. When the optical filter is for PDP, the antireflection film preferably has a near infrared shielding function.

  The conductive layer 12 is, for example, a mesh-like metal layer or metal-containing layer, a coating layer, a metal oxide layer (dielectric layer), or an alternately laminated film of metal oxide layers and metal layers. The mesh-like metal layer or metal-containing layer is generally formed by etching or printing, or is a metal fiber layer. This makes it easy to obtain a low resistance value. The mesh gap of the mesh-like metal layer or metal-containing layer is generally filled with a transparent resin, but in the present invention, it is preferably filled with an adhesive layer. This improves transparency. The conductive layer is preferably a coating layer, for example, a coating layer in which conductive particles of an inorganic compound are dispersed in a polymer, or a coating layer of a conductive polymer. This improves productivity and economy.

In the present invention, the storage modulus of the first adhesive layer 13A at a frequency of 1 Hz at -10 ° C is in the range of 1 × 10 ³ to 1 × 10 ⁶ Pa (particularly in the range of 1 × 10 ⁴ to 1 × 10 ⁵ Pa). And the dynamic loss modulus is in the range of 1 × 10 ^{3 to} 3 × 10 ⁵ Pa (particularly in the range of 5 × 10 ³ to 1 × 10 ⁵ Pa), and the second adhesive layer 13B has The storage elastic modulus at a frequency of 1 Hz at 25 ° C. is in the range of 1 × 10 ⁴ to 1 × 10 ⁶ Pa (particularly in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa), and the loss elastic modulus is 1 × 10 ^4. It is necessary to be in a range of ˜3 × 10 ⁶ Pa (particularly in a range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa). If the (dynamic) storage elastic modulus in the first adhesive layer is less than the lower limit of the above range, the adhesive layer is too soft and the surface hardness of the filter is lowered, and the stress for deformation becomes too small and the restoring force is too small. When it is affixed incorrectly, it is difficult to peel off and inferior in handling properties. On the other hand, if it exceeds the upper limit of the above range, it is too hard and the stress for deformation becomes too large, and the relaxation performance against the impact of the adhesive layer is insufficient To do. The same is true for the (dynamic) loss modulus. Further, for the second adhesive layer, if the (dynamic) storage elastic modulus is less than the lower limit of the above range, the adhesive layer is too soft, the stress for deformation becomes too small, and the restoring force is insufficient. When affixed by mistake, it is difficult to peel off and inferior in handleability. On the other hand, if it exceeds the upper limit of the above range, it is too hard and the stress for deformation becomes too large and the relaxation performance against the impact of the adhesive layer is insufficient. The same is true for the (dynamic) loss modulus.

  In the present invention, the impact absorbing ability of the adhesive layer was evaluated by the method shown in FIG. That is, it is evaluated by a spring hammer impact test defined by JISC-60068-2-75 (Environmental Test Method-Electric / Electronic-Part 2-75: Hammer Test).

  The adhesive layer is preferably a layer made of an acrylic resin. The thickness of the first adhesive layer is preferably in the range of 0.05 to 1.0 mm, more preferably in the range of 0.1 to 0.5 mm. The layer thickness of the second adhesive layer is preferably in the range of 0.005 to 0.1 mm, more preferably in the range of 0.01 to 0.05 mm. Thereby, it is easy to obtain excellent impact resistance.

In the ordinary antireflection film, the optical filter of the present invention has a surface resistance value of 10 ⁸ Ω / □ or less, preferably in the range of 10 ² to 10 ⁸ Ω / □, particularly in the range of 10 ² to 10 ⁵ Ω / □. In particular, in an electromagnetic wave shielding film using a metal mesh, it is generally 10Ω / □ or less, preferably 0.01 to 5Ω / □, particularly 0.005 to 5Ω / □. In each range, the effect of preventing charging or shielding electromagnetic waves is easily obtained.

  The optical filter of the present invention is a film excellent in antireflection, antistatic, and electromagnetic wave shielding if desired, and excellent in impact resistance. That is, the optical filter of the present invention includes at least two adhesive layers as shown in FIG. 1, and these adhesive layers have storage elastic modulus and loss elastic modulus in a specific range as described above. is doing. As a result, the glass plate which is the display screen of the display is hardly damaged even by an impact, and the surface has excellent scratch resistance.

  Furthermore, especially when a mesh-like metal layer is used as the conductive layer, the film surface provided with the metal layer is a rough surface. However, since the pressure-sensitive adhesive layer of the present invention has appropriate flexibility, it can also function as the transparent resin layer.

  In the present invention, for example, a transparent film having an antireflection film and a transparent film having a conductive layer are produced, and these are bonded via an adhesive layer, and at the same time or separately, a conductive layer of the transparent film is provided. An optical filter can be obtained by forming an adhesive layer on an unexposed surface. Therefore, the optical filter of the present invention can be manufactured as a single sheet, or a large number of optical filters can be manufactured continuously by laminating using a long transparent film and cutting to an appropriate size. . Therefore, it can be said that the optical filter of the present invention is easy to manufacture and excellent in productivity.

  FIG. 2 shows a schematic cross-sectional view of an example of a preferred embodiment in the optical filter of the present invention. In order for the conductive layer in FIG. 1 to be an optical filter suitable for PDP, it is preferably a mesh-like metal layer or metal-containing layer. FIG. 2 shows a preferred embodiment as an optical filter for PDP. In FIG. 2, a mesh-like metal conductive layer 22 is provided as a functional layer on one surface of the first transparent film 21A, and a first adhesive layer 23A is provided on the other surface. A second transparent film 21B is provided above the second adhesive layer 23B, and an antireflection film 24 is provided on the surface as a functional layer.

  Here, the conductive layer 22 is a mesh-like metal layer, and the mesh gap is filled with the second adhesive layer 23B. When this optical filter is attached to the display glass surface of the display body, the first adhesive layer 23A is generally opposed to the glass surface and bonded.

  When the optical filter is for PDP, the antireflection film preferably has a near infrared shielding function.

  In FIG. 1 or FIG. 2, when providing a near-infrared shielding layer or a near-infrared shielding film separately, it is preferable to take the aspect shown in FIG. In FIG. 3, a conductive layer 32 is provided as a functional layer on one surface of the first transparent film 31 </ b> A, a first adhesive layer 33 </ b> A is provided on the other surface, and a second layer is formed on the conductive layer 22. The antireflection film 24 is provided as a functional layer on the surface of the second transparent film 21B through the adhesive layer 33B. And the near-infrared shielding layer or the near-infrared shielding film 35 is provided on the 1st adhesion layer 33A, Furthermore, the adhesion layer 33c is provided on it. The near-infrared shielding film is a film having a near-infrared shielding function, and the film itself may have the function, or the near-infrared shielding layer may be provided on the transparent film. When this optical filter is affixed to the display glass surface of the display body, the adhesive layer 33c is generally adhered to the glass surface so as to oppose it.

  Next, FIG. 4 shows a schematic sectional view of an example showing another basic configuration of the optical filter of the present invention. The optical filter of FIG. 4 includes a third adhesive layer and a third transparent film between the functional layer of the first transparent film of the optical filter of FIG. 1, that is, between the conductive layer 12 and the second adhesive layer 13B. The laminated body is inserted. Furthermore, the impact relaxation property is improved by inserting the adhesive layer and the transparent film.

  In FIG. 4, a conductive layer 42 is provided as a functional layer on one surface of the first transparent film 41 </ b> A, a first adhesive layer 43 </ b> A is provided on the other surface, and a third layer is formed on the conductive layer 42. The third transparent film 41C is provided via the adhesive layer 43C, and the second transparent film 41B is provided on the third transparent film 41C via the second adhesive layer 43B. Is provided with an antireflection film 44 as a functional layer. The functional layer can be a conductive layer, an antireflection film (generally including a hard coat layer), a near-infrared shielding layer, or the like, but preferably has the configuration shown in FIG. When this optical filter is affixed to the display glass surface of the display body, the first adhesive layer 43A is opposed to the glass surface and is adhered by this adhesive. A release sheet may be provided on the first adhesive layer 43A.

  FIG. 5 shows a schematic cross-sectional view of an example of a preferred embodiment in the optical filter of the present invention. In order for the conductive layer in FIG. 4 to be an optical filter suitable for PDP, it is preferably a mesh-like metal layer or metal-containing layer. FIG. 5 shows a preferred embodiment as an optical filter for PDP. In FIG. 5, a mesh-like metal conductive layer 52 is provided as a functional layer on one surface of the first transparent film 51A, and a first adhesive layer 53A is provided on the other surface. A third transparent film 51C is provided above the third adhesive film 53C via a third adhesive layer 53C, and a second transparent film 51B is further provided on the third transparent film 51C via a second adhesive layer 53B. An antireflection film 54 is provided on the surface as a functional layer.

  Here, the conductive layer 52 is a mesh-like metal layer, and the gap is filled with the third adhesive layer 53C. When this optical filter is pasted on the display glass surface of the display body, generally, the first adhesive layer 53A is opposed to the glass surface and bonded.

  As shown in FIG. 3, a near-infrared shielding layer or film may be provided on the first adhesive layer 53A, or an adhesive layer may be further provided thereon.

  When the optical filter is for PDP, the antireflection film preferably has a near infrared shielding function.

  FIG. 6 shows a schematic sectional view of an example of another preferred embodiment of the optical filter of the present invention. The third transparent film 51C in FIG. 5 corresponds to an aspect in the case of having a near-infrared shielding layer as a functional layer. In FIG. 6, a mesh-like metal conductive layer 62 is provided as a functional layer on one surface of the first transparent film 61 </ b> A, and a first adhesive layer 63 </ b> A is provided on the other surface. A third transparent film 61C is provided above the third adhesive layer 63C via a third adhesive film 63C, and a near-infrared shielding layer 65 is provided on the third transparent film 61C. Further, a second transparent film 61B is provided on the near-infrared shielding layer 65 via a second adhesive layer 63B, and an antireflection film 64 is provided on the surface as a functional layer.

  Instead of the near-infrared shielding layer 65, a film (for example, a near-infrared cut film) having a near-infrared shielding function can be used for the third transparent film 51C itself without providing this. When this optical filter is applied to the display glass surface of the display main body, generally, the first adhesive layer 63A is opposed to the glass surface and bonded.

  From the viewpoint of productivity, it is advantageous that the antireflection film, the conductive layer and the like of the present invention are formed by coating. In particular, in both cases, an antireflection film can be produced with high productivity by forming by continuously performing coating and curing using an ultraviolet curable resin. However, as the conductive layer, a mesh-like metal layer or the like is often used particularly for PDF depending on the required performance. The coating film and coating layer can generally be formed on a rectangular transparent substrate (generally a film or sheet) or a continuous film. In the case of a rectangular transparent substrate, each layer is formed in a batch system, and when formed on a continuous film, each layer is formed in a continuous system, generally a roll-to-roll system. In the present invention, the latter is particularly preferable.

  The material used for the optical filter suitable for the display of this invention is demonstrated below.

  The material of the transparent film is not particularly limited as long as it is transparent (meaning “transparent to visible light”), but a plastic film is generally used. For example, polyester {eg, polyethylene terephthalate (PET), polybutylene terephthalate}, polymethyl methacrylate (PMMA), acrylic resin, polycarbonate (PC), polystyrene, triacetate resin, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene, Examples thereof include ethylene-vinyl acetate copolymer, polyvinyl butyral, metal ion crosslinked ethylene-methacrylic acid copolymer, polyurethane, cellophane and the like. Among these, polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), etc. are highly resistant to loads during processing (heat, solvent, bending, etc.) and particularly highly transparent. preferable. In particular, PET is preferable because it has excellent processability.

  The thickness of the transparent film varies depending on the use of the optical filter and the like, but is generally preferably about 1 μm to 5 mm.

In the conductive layer of the present invention, the surface resistance value of the obtained optical filter in the ordinary antireflection film has a surface resistance value of 10 ⁸ Ω / □ or less, preferably in the range of 10 ² to 10 ⁸ Ω / □, particularly It is preferably in the range of 10 ² to 10 ⁵ Ω / □, and particularly in an electromagnetic wave shielding film using a metal mesh, it is generally 10 Ω / □ or less, preferably in the range of 0.01 to ⁵ Ω / □, and particularly preferably 0. A range of 005 to 5Ω / □ is preferred. The conductive layer is preferably a coating layer, but a mesh (lattice) conductive layer is also preferable. Alternatively, a layer (a transparent conductive thin film of metal oxide (ITO or the like)) obtained by a vapor deposition method may be used. Further, it may be an alternate laminate of a metal oxide dielectric film such as ITO and a metal layer such as Ag (eg, ITO / silver / ITO / silver / ITO laminate).

  As the mesh-like conductive layer, metal fibers and metal-coated organic fiber metals made into a mesh, copper foil on a transparent film etched into a mesh and provided with openings, conductive on the transparent film And the like, in which a conductive ink is printed in a mesh shape.

  In the case of a mesh-like conductive layer, the mesh preferably has a wire diameter of 1 μm to 1 mm and an aperture ratio of 50 to 95% made of metal fibers and / or metal-coated organic fibers. A more preferable wire diameter is 10 to 500 μm, and an aperture ratio is 60 to 95%. The aperture ratio of the conductive mesh refers to the area ratio occupied by the opening portion in the projected area of the conductive mesh (a region excluding the outer frame when there is an outer frame).

  As the metal of the metal fiber and the metal-coated organic fiber constituting the conductive mesh, copper, stainless steel, aluminum, nickel, titanium, tungsten, tin, lead, iron, silver, carbon or alloys thereof, preferably copper, stainless steel, Aluminum is used.

  As the organic material for the metal-coated organic fiber, polyester, nylon, vinylidene chloride, aramid, vinylon, cellulose and the like are used.

  When a conductive foil such as a metal foil is subjected to pattern etching, copper, stainless steel, aluminum, nickel, iron, brass, or an alloy thereof, preferably copper, stainless steel, or nickel is used as the metal of the metal foil.

  If the thickness of the metal foil is too thin, it is not preferable in terms of handleability and workability of pattern etching, and if it is too thick, it affects the thickness of the glass obtained or the time required for the etching process becomes long. The thickness is preferably about 1 to 200 μm.

  The shape of the etching pattern is not particularly limited, and examples thereof include a grid-like metal foil in which square holes are formed, and a punching metal-like metal foil in which circular, hexagonal, triangular or elliptical holes are formed. It is done. Further, the holes are not limited to those regularly arranged, and may be a random pattern. It is preferable that the area ratio of the opening part in the projection surface of this metal foil is 20 to 95%.

  Alternatively, the mesh-like conductive layer may be formed by pattern printing of conductive ink on a transparent film. Using the following conductive ink, it can be printed on the surface of the transparent substrate by screen printing, ink jet printing, electrostatic printing or the like.

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

  If the thickness of the printed film formed in this way is too thin, the electromagnetic wave shielding property is insufficient, which is not preferable. If the thickness is too thick, the thickness of the obtained filter is affected, so that the thickness is about 0.5 to 100 μm. It is preferable to do this.

  According to such pattern printing, the degree of freedom of the pattern is large, and a conductive layer having an arbitrary wire diameter, interval and opening shape can be formed. Therefore, a plastic film having desired electromagnetic wave shielding properties and light transmission properties Can be easily formed.

  There is no particular limitation on the pattern printing shape of the conductive layer. For example, a grid-like printed film having a rectangular opening or a punching metal shape having a circular, hexagonal, triangular or elliptical opening. Examples include printed films. Further, the openings are not limited to those regularly arranged, and may be a random pattern. It is preferable that the area ratio of the opening part in the projection surface of this printed film is 20 to 95%.

  Examples of the conductive layer by coating include a coating layer in which conductive particles of an inorganic compound are dispersed in a polymer.

  Examples of the inorganic compound constituting the conductive particles include metals, alloys such as aluminum, nickel, indium, chromium, gold, vanadium, tin, cadmium, silver, platinum, copper, titanium, cobalt, lead; or ITO, oxidation Indium, tin oxide, zinc oxide, indium oxide-tin oxide (ITO, so-called indium-doped tin oxide), tin oxide-antimony oxide (ATO, so-called antimony-doped tin oxide), zinc oxide-aluminum oxide (ZAO; so-called aluminum-doped oxide) And conductive oxides such as zinc). In particular, ITO is preferable. The average particle size is preferably 10 to 10,000 nm, particularly preferably 10 to 50 nm.

  Examples of the polymer include acrylic resin, polyester resin, epoxy resin, urethane resin, phenol resin, maleic acid resin, melamine resin, urea resin, polyimide resin, and silicon-containing resin. Furthermore, it is preferable that it is a thermosetting resin among these resins.

  Alternatively, the polymer is particularly preferably an ultraviolet curable resin used for a hard coat layer described later.

  The conductive layer is formed by coating by dispersing the conductive fine particles in a polymer (using a solvent if necessary) by mixing or the like to prepare a coating solution, and coating the coating solution on a transparent film. And then drying and curing as appropriate. In the case of using a thermoplastic resin, it is obtained by drying after coating, and in the case of a thermosetting type, it is obtained by drying and thermosetting. When an ultraviolet curable resin is used, it can be obtained by drying after application and irradiating with ultraviolet rays after coating.

  The thickness of the conductive layer formed by coating is preferably 0.01 to 5 μm, particularly preferably 0.05 to 3 μm. When the thickness is less than 0.01 μm, the electromagnetic wave shielding property or antistatic property may not be sufficient. On the other hand, when the thickness exceeds 5 μm, the transparency of the resulting film may be lowered.

  The conductive layer of the present invention is also preferably a conductive polymer layer formed by coating. For example, hydrocarbon polymers such as polyacetylene, polyphenylene, polyphenylene vinylene, polyacene, polyphenylacetylene, polynaphthalene; heteroatom-containing polymers such as polypyrrole, polyaniline, polythiophene, polyethylene vinylene, polyazulene, polyisothianaphthene . Polypyrrole and polythiophene are preferred. The thickness of the light conductive layer of the conductive polymer is preferably 0.01 to 5 μm, particularly preferably 0.05 to 3 μm. When the thickness is less than 0.01 μm, the electromagnetic shielding property or antistatic property may not be sufficient, while when it exceeds 5 μm, the transparency of the resulting film may be lowered.

  When the conductive layer is formed by a vapor deposition method (metal oxide layer), the formation method is not particularly limited, but a vapor phase such as sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition, chemical vapor deposition, etc. Examples of the method include a film forming method, printing, and coating, but a gas phase film forming method (sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition, chemical vapor deposition) is preferable. A conductive layer can be formed using the inorganic compound. When the conductive layer is formed by a vapor deposition method, the layer thickness is preferably 30 to 50000 nm, particularly about 50 nm.

  A metal plating layer may be further provided on the conductive layer in order to improve conductivity. The metal plating layer can be formed by a known electrolytic plating method or electroless plating method. As the metal used for plating, generally, copper, copper alloy, nickel, aluminum, silver, gold, zinc, tin or the like can be used, preferably copper, copper alloy, silver, or nickel, In particular, it is preferable to use copper or a copper alloy from the viewpoint of economy and conductivity.

  Further, the conductive layer may be an alternately laminated film of a dielectric layer (metal oxide) and a metal layer. In particular, a laminate of 5 layers or more of dielectric layer / metal layer / dielectric layer / metal layer / dielectric layer is preferable. For example, an alternate laminate of a dielectric layer of a metal oxide such as ITO and a metal layer of Ag or the like (eg, a laminate of ITO / silver / ITO / silver / ITO) can be used.

  The transparent conductive film can be formed by physical vapor deposition or chemical vapor deposition. Examples of the physical vapor deposition method include a vacuum vapor deposition method, a sputtering method, an ion plating method, and a laser ablation method, but it is generally preferable to form a film by the sputtering method. Examples of the chemical vapor deposition method include an atmospheric pressure CVD method, a low pressure CVD method, and a plasma CVD method.

  The antireflection film of the present invention is generally a composite film of a hard coat layer having a higher refractive index than that of the substrate and a low refractive layer provided thereon, or preferably a higher refractive index layer on the low refractive index layer. It is a composite membrane provided. Even if it is only a hard-coat layer with a higher refractive index than a transparent film, or only a low refractive index layer, an antireflection film is effective. However, when the refractive index of the transparent film is low, a composite film of a hard coat layer having a refractive index lower than that of the transparent film and a high refractive layer provided thereon, or a low refractive index layer is further provided on the high refractive index layer. A composite film obtained may be used. When the antireflection film of the present invention is provided with a near-infrared shielding function, the hard coat layer or the like is introduced by mixing and / or kneading a material described later (eg, a dye) that absorbs near-infrared rays, or preventing reflection. What is necessary is just to introduce | transduce into the transparent film for forming a film | membrane.

  As a hard-coat layer, the layer which consists of an acrylic resin layer, an epoxy resin layer, a urethane resin layer, a silicon resin layer etc. can be mentioned, The layer thickness is 1-50 micrometers normally, Preferably it is 1-10 micrometers. Either a thermosetting resin or an ultraviolet curable resin may be used, but an ultraviolet curable resin is preferable.

  Examples of the thermosetting resin include phenol resin, resorcinol resin, urea resin, melamine resin, epoxy resin, acrylic resin, urethane resin, furan resin, and silicon resin.

  Examples of the ultraviolet curable resin (monomer, oligomer) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 2-ethylhexyl polyethoxy (meth) acrylate. , Benzyl (meth) acrylate, isobornyl (meth) acrylate, phenyloxyethyl (meth) acrylate, tricyclodecane mono (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, acryloylmorpholine , N-vinylcaprolactam, 2-hydroxy-3-phenyloxypropyl (meth) acrylate, o-phenylphenyloxyethyl (meth) acrylate, neopentylglyce Di (meth) acrylate, neopentyl glycol dipropoxy di (meth) acrylate, neopentyl glycol di (meth) acrylate hydroxypivalate, tricyclodecane dimethylol di (meth) acrylate, 1,6-hexanediol di (meth) Acrylate, nonanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, tris [(meth) acryloxyethyl] isocyanurate, ditrimethylolpropane (Meth) acrylate monomers such as tetra (meth) acrylate; polyol compounds (for example, ethylene glycol, propylene glycol, neopentyl glycol, , 6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonanediol, 2-ethyl-2-butyl-1,3-propanediol, trimethylolpropane, diethylene glycol, dipropylene glycol, polypropylene Polyols such as glycol, 1,4-dimethylolcyclohexane, bisphenol A polyethoxydiol, polytetramethylene glycol, the polyols and succinic acid, maleic acid, itaconic acid, adipic acid, hydrogenated dimer acid, phthalic acid, isophthalic acid Polyester polyols which are reaction products of polybasic acids such as acid and terephthalic acid or acid anhydrides thereof, polycaprolactone polyols which are reaction products of the polyols and ε-caprolactone, the polyols and the above, Polybasic acid or this Reaction products of these acid anhydrides with ε-caprolactone, polycarbonate polyols, polymer polyols, etc.) and organic polyisocyanates (for example, tolylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphenylmethane-4,4′-diisocyanate, diisocyanate) Cyclopentanyl diisocyanate, hexamethylene diisocyanate, 2,4,4′-trimethylhexamethylene diisocyanate, 2,2′-4-trimethylhexamethylene diisocyanate, etc.) and a hydroxyl group-containing (meth) acrylate (for example, 2-hydroxyethyl (meta ) Acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenyloxypropyl (meth) acrylic Rate, cyclohexane-1,4-dimethylol mono (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, glycerin di (meth) acrylate, etc.) (Meth) such as bisphenol type epoxy (meth) acrylate, which is a reaction product of bisphenol type epoxy resin such as polyurethane (meth) acrylate, bisphenol A type epoxy resin, bisphenol F type epoxy resin and (meth) acrylic acid which is a reaction product Examples include acrylate oligomers. These compounds can be used alone or in combination. These ultraviolet curable resins may be used as a thermosetting resin together with a thermal polymerization initiator.

  For the hard coat layer, among the above-mentioned ultraviolet curable resins (monomers and oligomers), hard materials such as pentaerythritol tri (meth) acrylate, pentaerythritol penta (meth) acrylate and dipentaerythritol hexa (meth) acrylate are used. It is preferable to mainly use polyfunctional monomers.

  Any compound suitable for the properties of the ultraviolet curable resin can be used as the photopolymerization initiator for the ultraviolet curable resin. For example, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, 2, Acetophenones such as 2-diethoxyacetophenone, benzoins such as benzyldimethyl ketal, benzophenones such as benzophenone, 4-phenylbenzophenone and hydroxybenzophenone, thioxanthones such as isopropylthioxanthone and 2-4-diethylthioxanthone, and other special products For example, methylphenylglyoxylate can be used. Particularly preferably, 2,2-diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, benzophenone and the like. These photopolymerization initiators may be optionally selected from one or more known photopolymerization accelerators such as benzoic acid type or tertiary amine type such as 4-dimethylaminobenzoic acid. It can be used by mixing at a ratio. Moreover, it can be used by 1 type, or 2 or more types of mixture of only a photoinitiator. Particularly preferred is 1-hydroxycyclohexyl phenyl ketone (Irgacure 184, manufactured by Ciba Specialty Chemicals).

  The quantity of a photoinitiator is 0.1-10 mass% with respect to a resin composition, Preferably it is 0.1-5 mass%.

  The hard coat layer preferably has a refractive index lower than that of the transparent substrate, and a refractive index lower than that of the substrate is generally easily obtained by using the ultraviolet curable resin. Therefore, it is preferable to use a material having a high refractive index such as PET as the transparent substrate. Therefore, the hard coat layer preferably has a refractive index of 1.60 or less. The film thickness is as described above.

The high refractive index layer is made of, for example, ITO, ATO, Sb ₂ O ₃ , SbO ₂ , In ₂ O ₃ , SnO ₂ , ZnO, Al-doped ZnO, TiO ₂ or the like in a polymer (preferably UV curable resin). It is preferable to use a layer in which conductive metal oxide fine particles (inorganic compound) are dispersed. The metal oxide fine particles preferably have an average particle size of 10 to 10,000 nm, preferably 10 to 50 nm. In particular, ITO (especially having an average particle diameter of 10 to 50 nm) is preferable. Those having a refractive index of 1.64 or more are suitable. The film thickness is generally in the range of 10 to 500 nm, preferably 20 to 200 nm.

  When the high refractive index layer is a conductive layer, the minimum reflectance of the surface reflectance of the antireflection film is set within 1.5% by setting the refractive index of the high refractive index layer 2 to 1.64 or more. The minimum reflectance of the surface reflectance of the antireflection film can be made to be within 1.0% by setting it to 1.69 or more, preferably 1.69 to 1.82.

  The hard coat layer preferably has a visible light transmittance of 85% or more. Both the visible light transmittance of the high refractive index layer and the low refractive index layer are preferably 85% or more.

  The low refractive index layer is a layer (cured) in which fine particles such as silica and fluororesin, preferably 10 to 40% by weight (preferably 10 to 30% by mass) of hollow silica are dispersed in a polymer (preferably UV curable resin). Layer). The refractive index of this low refractive index layer is preferably 1.45 to 1.51. When the refractive index is more than 1.51, the antireflection property of the antireflection film is deteriorated. The film thickness is generally in the range of 10 to 500 nm, preferably 20 to 200 nm.

  As the hollow silica, those having an average particle diameter of 10 to 100 nm, preferably 10 to 50 nm, and a specific gravity of 0.5 to 1.0, preferably 0.8 to 0.9 are preferable.

  When the antireflection film is composed of the above three layers, for example, the thickness of the hard coat layer is 2 to 20 μm, the thickness of the high refractive index layer is 75 to 90 nm, and the thickness of the low refractive index layer is 85 to 110 nm. Preferably there is.

  In order to form each layer of the antireflection film, as described above, the polymer (preferably ultraviolet curable resin) is blended with the fine particles as necessary, and the obtained coating solution is applied, and then dried. If necessary, it is heat-cured, or after coating, if necessary, it is dried and irradiated with ultraviolet rays. In this case, each layer may be applied and cured one by one, or all the layers may be applied and then cured together.

  As a specific method of coating, a method of coating a coating solution in which an ultraviolet curable resin containing an acrylic monomer or the like is made into a solution with a solvent such as toluene is coated with a gravure coater, and then dried, and then cured by ultraviolet rays. Can be mentioned. This wet coating method has the advantage that the film can be uniformly formed at high speed at low cost. After this coating, for example, by irradiating and curing with ultraviolet rays, the effect of improving the adhesion and increasing the hardness of the film can be obtained. The conductive layer can be formed similarly.

  In the case of ultraviolet curing, many light sources that emit light in the ultraviolet to visible range can be used as the light source, such as ultra-high pressure, high pressure, low pressure mercury lamp, chemical lamp, xenon lamp, halogen lamp, mercury lamp, carbon arc lamp, incandescent lamp. And laser light. The irradiation time cannot be determined unconditionally depending on the type of lamp and the intensity of the light source, but is about several seconds to several minutes. Moreover, in order to accelerate curing, the laminate may be preheated to 40 to 120 ° C. and irradiated with ultraviolet rays.

  The antireflection layer of the present invention is preferably formed by coating as described above, but may be formed by a vapor phase film forming method. Usually, the high refractive index layer and the low refractive index layer can be formed by physical vapor deposition or chemical vapor deposition. Examples of the physical vapor deposition method include a vacuum vapor deposition method, a sputtering method, an ion plating method, and a laser ablation method, but it is generally preferable to form a film by the sputtering method. Examples of the chemical vapor deposition method include an atmospheric pressure CVD method, a low pressure CVD method, and a plasma CVD method.

  Examples of the combination of the high refractive index layer and the low refractive index layer include the following.

(A) 1 layer each in the order of high refractive index layer / low refractive index layer, laminated in a total of 2 layers, (b) 2 layers of high refractive index layer / low refractive index layer alternately, 4 layers in total (C) One layer each in the order of medium refractive index layer / high refractive index layer / low refractive index layer, laminated in a total of three layers, (d) high refractive index layer / low refractive index layer In this order, each layer is alternately stacked in 3 layers for a total of 6 layers. As the high refractive index layer, ITO (tin indium oxide) or ZnO, a thin film of ZnO, TiO ₂ , SnO ₂ , ZrO or the like doped with Al can be employed. As the low refractive index layer, a thin film having a refractive index of 1.6 or less, such as SiO ₂ , MgF ₂ , Al ₂ O _3, or the like can be used.

  The transparent conductive film can be formed by physical vapor deposition or chemical vapor deposition. Examples of the physical vapor deposition method include a vacuum vapor deposition method, a sputtering method, an ion plating method, and a laser ablation method, but it is generally preferable to form a film by the sputtering method. Examples of the chemical vapor deposition method include an atmospheric pressure CVD method, a low pressure CVD method, and a plasma CVD method.

  The adhesive layer of the present invention is provided so that the glass of the display is not damaged or the antireflection film itself is not damaged when an impact is applied to the display equipped with the antireflection film of the present invention from the antireflection film side. ing.

The first, second and third adhesive layers of the present invention have a specific elastic modulus. That is, the storage modulus of the first adhesive layer at a frequency of 1 Hz at −10 ° C. is in the range of 1 × 10 ³ to 1 × 10 ⁶ Pa (particularly in the range of 1 × 10 ⁴ to 1 × 10 ⁵ Pa). And the dynamic loss elastic modulus is in the range of 1 × 10 ^{3 to} 3 × 10 ⁵ Pa (particularly in the range of 5 × 10 ^{3 to} 5 × 10 ⁴ Pa), and the second adhesive layer is at 25 ° C. The storage elastic modulus at a frequency of 1 Hz is in the range of 1 × 10 ⁴ to 1 × 10 ⁶ Pa (particularly in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa), and the loss elastic modulus is 1 × 10 ^{4 to} 3 × 10. It is necessary to be in the range of ⁶ Pa (particularly in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa). The storage elastic modulus of the third adhesive layer at a frequency of 1 Hz at 25 ° C. is in the range of 1 × 10 ⁴ to 1 × 10 ⁶ Pa (particularly in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa). The loss elastic modulus is preferably in the range of 1 × 10 ^{4 to} 3 × 10 ⁶ Pa (particularly in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa).

Further, even when the storage elastic modulus value of the second adhesive layer is larger than, equal to or smaller than the storage elastic modulus value of the first adhesive layer, it is small in the range of 9 × 10 ³ Pa or less, and The loss elastic modulus value of the pressure-sensitive adhesive layer 2 is preferably smaller than the value of the loss elastic modulus of the first pressure-sensitive adhesive layer, even if it is the same or smaller, in the range of 5 × 10 ³ Pa or less. This further improves the impact resistance and surface hardness characteristics.

Further, even when the storage elastic modulus value of the third adhesive layer is larger than, equal to, or smaller than the storage elastic modulus value of the first adhesive layer, it is small in the range of 9 × 10 ³ Pa or less, and The loss elastic modulus value of No. 3 adhesive layer is preferably smaller than the value of the loss elastic modulus of the first adhesive layer, even if it is the same or smaller, in the range of 5 × 10 ³ Pa or less. This further improves the impact resistance and surface hardness characteristics.

  Examples of the resin constituting the adhesive layer include ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, acrylic resin (eg, ethylene- (meth) acrylic acid copolymer, ethylene- (meth)). Ethyl acrylate copolymer, ethylene- (meth) methyl acrylate copolymer, metal ion crosslinked ethylene- (meth) acrylic acid copolymer), partially saponified ethylene-vinyl acetate copolymer, carboxylated ethylene-vinyl acetate And ethylene copolymers such as copolymers, ethylene- (meth) acrylic-maleic anhydride copolymers, ethylene-vinyl acetate- (meth) acrylate copolymers, etc. "Means" acrylic or methacrylic "). In addition, polyvinyl butyral (PVB) resin, epoxy resin, phenol resin, silicone resin, polyester resin, urethane resin, and the like can be used. However, it is easy to obtain good impact absorbability with an ethylene-vinyl acetate copolymer ( EVA), an acrylic resin.

  The acrylic resin is preferably a cured layer of an ultraviolet ray or a thermosetting (meth) acrylate composition.

  In general, the curable (meth) acrylate composition is preferably composed of a mixture of monomer materials mainly composed of (meth) acrylic acid alkyl ester having an alkyl group having 4 to 14 carbon atoms (50% by mass or more). . The mixture of monomer materials mainly composed of (meth) acrylic acid alkyl ester may be a mixture of monomer materials including a partially polymerized partial polymer. If necessary, 0.1 to 1.0 part by mass of a polyfunctional (meth) acrylate having two or more (meth) acryloyl groups is added to 100 parts by mass of the monomer material mixture. Particularly in the first adhesive layer, the mixture of monomer materials contains 0.1 to 1 polyfunctional (meth) acrylate having 2 or more (meth) acryloyl groups with respect to 100 parts by mass of the partial polymer / monomer mixture. It is preferable to contain 0.0 part by mass. In the present invention, the (meth) acrylic acid alkyl ester refers to an acrylic acid alkyl ester and / or a methacrylic acid alkyl ester.

  Examples of the (meth) acrylic acid alkyl ester having an alkyl group having 4 to 14 carbon atoms used as the monomer material (preferably used in the production of the partial polymer / monomer mixture) include, for example, butyl (meth) acrylate, Isoamyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, tetradecyl (meth) An acrylate etc. are mentioned, These are used 1 type or in mixture of 2 or more types. The alkyl group may be either a straight chain or a branched chain, but is preferably not a t-alkyl group.

  For the purpose of improving the physical properties such as optical properties and heat resistance of monovinyl monomer copolymerizable with the above monomer material, in the production of a partial polymer / monomer mixture, or in addition to the partial polymer / monomer mixture. It is preferable to use it together as necessary. Examples of the monovinyl monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate. Hydroxyl group-containing monomers; (meth) acrylic acid alkoxyalkyl monomers such as (meth) acrylic acid methoxyethyl and (meth) acrylic acid ethoxyethyl; (meth) acrylic acid polyethylene glycol, (meth) acrylic acid polypropylene glycol, ( Glycol monomers such as (meth) acrylic acid methoxyethylene glycol and (meth) acrylic acid methoxypolypropylene glycol; (meth) acrylamides such as N-methylolacrylamide and N-methylolmethacrylamide; Such as acrylic acid and acrylic acid.

  Further, methacrylic acid and methacrylic acid (acrylic acid is preferred); hydroxyl groups such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate Monomers; (meth) acrylic acid alkoxypolyalkylene glycols such as (meth) acrylic acid methoxypolypropylene glycol; and hydroxyl group-containing (meth) acrylamides such as N-methylolacrylamide and N-methylolmethacrylamide are preferred. A hydroxyl group-containing monomer is preferable because it is effective in improving the heat and moisture resistance. In particular, acrylic acid is preferred from the viewpoint of good compatibility.

  In particular, the monomer constituting the acrylic resin used in the first adhesive layer preferably further contains trimethylolpropane triacrylate, and (meth) acrylic acid alkoxypolyalkylene glycol [preferably (meth) acrylic. Acid methoxypolypropylene glycol (addition number of propylene oxide is 4 to 16, particularly 6 to 15 is preferable)] and hydroxyl group-containing (meth) acrylate [preferably 4-hydroxyalkyl (meth) acrylate (the number of carbon atoms of alkyl) 3 to 5 are preferable), and it is also preferable to contain 4-hydroxybutyl (meth) acrylate in particular. Further, it preferably contains trimethylolpropane triacrylate, alkoxy polyalkylene glycol (meth) acrylate and hydroxyl group-containing (meth) acrylate. In the first adhesive layer, 3 to 70 parts by mass (preferably (meth) acrylic acid alkoxypolyalkylene glycol and hydroxyl group-containing (meth) acrylate) with respect to 100 parts by mass of all monomer materials constituting the acrylic resin. 7 to 35 parts by mass) and 0.7 to 35 parts by mass (preferably 1.4 to 21 parts by mass). Moreover, 5-100 mass parts (preferably 10-50 each) of (meth) acrylic acid alkoxy polyalkylene glycol and hydroxyl-containing (meth) acrylate are used with respect to 100 mass parts of the partial polymer / monomer mixture when used. Parts by mass), 1 to 50 parts by mass (preferably 2 to 30 parts by mass).

  Moreover, it is preferable that 2-hydroxylethyl methacrylate or N-methylol acrylamide is further included as a monomer which comprises the acrylic resin used for the 2nd or 3rd adhesion layer. In the second or third adhesive layer, 0.1 to 5 parts by mass (particularly 0.2 to 2 parts by weight) of 2-hydroxylethyl methacrylate or N-methylolacrylamide with respect to 100 parts by mass of all monomers constituting the acrylic resin. 2 parts by mass) is preferably included.

  In addition, the first adhesive layer needs to be particularly excellent in flexibility. Compared with the second and third adhesive layers, the first adhesive layer has less acrylic acid and has 4 to 14 carbon atoms. It is preferable to use a large amount of (meth) acrylic acid alkyl ester (particularly 2-ethylhexyl (meth) acrylate) having For example, the first adhesive layer uses 3 parts by mass or less of acrylic acid with respect to 100 parts by mass of all monomers constituting the acrylic resin, and the second and third adhesive layers have an acrylic acid of 3.5 parts by mass or more. It is preferable to use it. Moreover, it is preferable to use a hydroxyl group-containing monomer or a hydroxyl group-containing (meth) acrylamide for the second and third adhesive layers.

  For the production of the partial polymer / monomer mixture, a known radical polymerization method such as solution polymerization, bulk polymerization, emulsion polymerization or the like can be appropriately selected and used using an appropriate polymerization initiator. As the radical polymerization initiator, various known azo and peroxide initiators can be used. For example, in bulk polymerization, a polymerization initiator is used in an amount of about 0.01 to 0.2 parts by mass with respect to 100 parts by mass of the monomer, and this is irradiated with a small amount of radiation such as ultraviolet rays to partially polymerize to increase the reaction system. It is obtained by making it stick. The polymerization rate of the monomer is preferably 3 to 50% by mass, more preferably 5 to 30% by mass, and particularly preferably 10 to 20% by mass.

  Examples of the polyfunctional (meth) acrylate having two or more (meth) acryloyl groups include hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, and (poly) propylene glycol di (meth) acrylate. , Neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, epoxy (meth) acrylate, Polyester (meth) acrylate, urethane (meth) acrylate, etc. can be mentioned.

As the preferable curable (meth) acrylate composition (especially preferable for the first adhesive layer), a (meth) acrylic acid alkyl ester having an alkyl group having 4 to 14 carbon atoms is mainly used (50 (Mass% or more) 100 parts by mass of a partial polymer / monomer mixture obtained by partially polymerizing the monomer material, as described above, containing (alkyl) alkyl-polyalkylene glycol (meth) acrylate and hydroxyl group as (meth) acrylic acid alkyl ester An appropriate amount of (meth) acrylate is added, and further 0.1 to 1.0 part by mass of polyfunctional (meth) acrylate having two or more (meth) acryloyl groups is added. For the second and third adhesive layers, it is preferable not to contain a polyfunctional (meth) acrylate. As the partial polymer / monomer mixture constituting the curable (meth) acrylate composition, in particular, at least an alkyl acrylate (However, the alkyl group has 4 to 10 carbon atoms; particularly 2-ethylhexyl acrylate) and a mixture containing acrylic acid is preferable. The acrylic acid is preferably used in an amount of 0.1 to 20% by mass, particularly 0.5 to 10% by mass, based on the alkyl acrylate. For the first adhesive layer, the acrylic acid is preferably 4 to 6% by mass relative to the alkyl acrylate, and for the second and third adhesive layers, the acrylic acid is 0% relative to the alkyl acrylate. .1 to 3.5% by mass is preferable.

  When a partial polymer / monomer mixture is used as a monomer constituting the curable (meth) acrylate composition, in addition to this, a polyfunctional acrylate monomer having 2 or more (meth) acryloyl groups (particularly trimethylolpropane) It is particularly preferred that it contains (triacrylate). The polyfunctional acrylate monomer is generally used in an amount of 0.1 to 1.0 part by mass with respect to 100 parts by mass of the partial polymer / monomer mixture.

  By using such an acrylic resin material, it is easy to design a resin for obtaining the specific dynamic storage elastic modulus and static loss elastic modulus. In addition, this makes it easy to obtain a layer that absorbs impact and easily returns to its original shape from deformation due to impact. The gel fraction of the obtained layer is preferably 70 to 100% by mass, more preferably 80 to 100% by mass, and particularly preferably 80 to 99% by mass. The weight average molecular weight is preferably 10,000 to 700,000, particularly preferably 400,000 to 700,000.

  The thickness of the first adhesive layer is preferably in the range of 0.05 to 1.0 mm, more preferably in the range of 0.1 to 0.5 mm. The layer thickness of the second adhesive layer is preferably in the range of 0.005 to 0.1 mm, more preferably in the range of 0.01 to 0.05 mm. Thereby, it is easy to obtain excellent impact resistance. Furthermore, the layer thickness of the first adhesive layer is preferably 5 to 20 times the layer thickness of the second or third adhesive layer.

  The ultraviolet or thermosetting (meth) acrylate composition contains the photopolymerization initiator (ultraviolet light) or thermal polymerization initiator (heat) described as the material for the hard coat layer, and various additives as required. . For example, a known tackifier resin (for example, rosin resin, terpene resin, petroleum resin, coumarone-indene resin, styrene resin, etc.) may be added to adjust the adhesive properties of the composition. Additives other than tackifying resins include fillers such as plasticizers, glass fibers, glass beads, metal powder, or finely divided silica, pigments, colorants, antioxidants, anti-aging agents, and silane coupling agents. And ultraviolet absorbers. Moreover, it can also be set as the adhesive layer which contains microparticles | fine-particles and has light diffusibility.

  The method for forming the adhesive layer of the present invention is not particularly limited, and various methods can be used. For example, a method of forming an adhesive layer by applying the curable (meth) acrylate composition on one or both sides of a transparent film or the surface of a desired layer, drying, and curing as necessary (preferably by bulk polymerization). Can be mentioned. Also, after applying the curable (meth) acrylate composition on a transfer sheet whose surface is peelable, drying and curing as necessary to form an adhesive layer, the adhesive layer is attached to one or both sides of the substrate, The adhesive layer may be formed by peeling and removing the transfer sheet.

  When the adhesive layer of the present invention is formed by ultraviolet irradiation, for example, after the ultraviolet curable (meth) acrylate composition is applied to a transfer sheet whose surface is peelable, the surface of the coating film is also applied as necessary. It can be obtained by placing a peelable transfer sheet (in a sandwich state) and curing it by ultraviolet irradiation, and then removing the transfer sheet. Alternatively, the adhesive layer can be formed by applying the ultraviolet curable (meth) acrylate composition directly on the surface where the adhesive layer of the optical filter is to be provided and then curing the composition by ultraviolet irradiation. Further, since it is necessary to form a relatively thick impact buffer layer, it is preferable to form the adhesive layer by photopolymerization reaction.

  In a preferred embodiment of the UV curing method, first, a monomer material and a photopolymerization initiator are mixed, and a part of the monomer is polymerized by a small amount of light irradiation to thicken the reaction system (production of a partial polymer / monomer mixture). . A polyfunctional (meth) acrylate, a photopolymerization initiator, and the like are appropriately added to and mixed with this partial polymer / monomer mixture, and this is applied to the substrate or the like with an appropriate thickness. Then, it is polymerized and cross-linked by light irradiation to form an impact buffer layer. The quantity of a photoinitiator is 0.1-10 mass% with respect to an ultraviolet-ray or a thermosetting (meth) acrylate composition, Preferably it is 0.1-5 mass%.

  Alternatively, the adhesive layer of a thermoplastic resin such as EVA, which will be described later, can be formed by a method other than the above-mentioned application. For example, after mixing EVA and the above-mentioned additives and kneading with an extruder, a roll, etc., a calendar, a roll It is manufactured by forming a sheet into a predetermined shape by a film forming method such as T-die extrusion or inflation. During film formation, embossing is applied to prevent blocking and facilitate degassing during pressure bonding with a glass substrate.

  EVA can also be used as the material for the adhesive layer. EVA having a vinyl acetate content of 5 to 50% by weight, preferably 15 to 40% by weight is used. When the vinyl acetate content is less than 5% by weight, there is a problem in transparency, and when it exceeds 40% by weight, the mechanical properties are remarkably deteriorated and the film formation becomes difficult and the films are easily blocked.

  As the cross-linking agent, an organic peroxide is suitable for heat cross-linking and is selected in consideration of sheet processing temperature, cross-linking temperature, storage stability, and the like. Examples of peroxides that can be used include 2,5-dimethylhexane-2,5-dihydroperoxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane-3; -Butyl peroxide; t-butylcumyl peroxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane; dicumyl peroxide; α, α'-bis (t-butylperoxyisopropyl) ) Benzene; n-butyl-4,4-bis (t-butylperoxy) valerate; 2,2-bis (t-butylperoxy) butane; 1,1-bis (t-butylperoxy) cyclohexane; , 1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane; t-butylperoxybenzoate; benzoyl peroxide; Luperoxyacetate; 2,5-dimethyl-2,5-bis (tertiarybutylperoxy) hexyne-3; 1,1-bis (tertiarybutylperoxy) -3,3,5-trimethylcyclohexane; 1-bis (tert-butylperoxy) cyclohexane; methyl ethyl ketone peroxide; 2,5-dimethylhexyl-2,5-bisperoxybenzoate; tert-butyl hydroperoxide; p-menthane hydroperoxide; p-chlorobenzoyl Peroxides; tertiary butyl peroxyisobutyrate; hydroxyheptyl peroxide; chlorohexanone peroxide. These peroxides are used singly or in combination of two or more, and are usually used at a ratio of 5 parts by mass or less, preferably 0.5 to 5.0 parts by mass with respect to 100 parts by weight of EVA. .

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

  Various acryloxy group or methacryloxy group and allyl group-containing compounds can be added to improve EVA physical properties (mechanical strength, optical properties, adhesiveness, weather resistance, whitening resistance, crosslinking speed, etc.). . As the compound used for this purpose, acrylic acid or methacrylic acid derivatives, for example, esters and amides thereof are the most common. As the ester residue, in addition to alkyl groups such as methyl, ethyl, dodecyl, stearyl, lauryl, cyclohexyl groups , Tetrahydrofurfuryl group, aminoethyl group, 2-hydroxyethyl group, 3-hydroxypropyl group, 3-chloro-2-hydroxypropyl group and the like. Further, esters with polyfunctional alcohols such as ethylene glycol, triethylene glycol, polyethylene glycol, trimethylolpropane, and pentaerythritol can also be used. A typical amide is diacetone acrylamide.

  Examples thereof include polyfunctional esters such as acrylic or methacrylic acid esters such as trimethylolpropane, pentaerythritol, glycerin, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, diallyl isophthalate, diallyl maleate, etc. Examples include allyl group-containing compounds. These are used alone or in combination of two or more, and are usually used in an amount of 0.1 to 2 parts by weight, preferably 0.5 to 5 parts by weight, based on 100 parts by weight of EVA. .

  When EVA is crosslinked by light, a photosensitizer is usually used in an amount of 5 parts by mass or less, preferably 0.1 to 3.0 parts by mass based on 100 parts by mass of EVA instead of the peroxide.

  In this case, usable photosensitizers include, for example, benzoin, benzophenone, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, dibenzyl, 5-nitroacenaphthene, hexachlorocyclopentadiene, p-nitrodiphenyl. , P-nitroaniline, 2,4,6-trinitroaniline, 1,2-benzanthraquinone, 3-methyl-1,3-diaza-1,9-benzanthrone, and the like. Alternatively, two or more types can be mixed and used.

  Moreover, a silane coupling agent is used in combination as an adhesion promoter. As this silane coupling agent, vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycid Xylpropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-chloropropylmethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N- β (aminoethyl) -γ-aminopropyltrimethoxysilane and the like can be mentioned.

  The silane coupling agent is generally used in an amount of 0.001 to 10 parts by mass, preferably 0.001 to 5 parts by mass, based on 100 parts by mass of EVA, and one or more types are mixed and used.

  In addition, the EVA adhesive layer according to the present invention may further contain a small amount of an ultraviolet absorber, an infrared absorber, an anti-aging agent, a coating processing aid, a colorant, and the like. A small amount of a filler such as hydrophobic silica or calcium carbonate may be included.

  The near-infrared shielding layer or film is generally a near-infrared cut film, for example, a near-infrared cut layer containing a pigment or the like formed on the surface of the base film, or a film containing a pigment or the like. is there. Examples of the dye include a cyanine dye, a squarylium dye, an anthraquinone dye, a phthalocyanine dye, a polymethine dye, and a polyazo dye, and a cyanine dye or a squarylium dye is particularly preferable. These dyes can be used alone or in combination.

  A particularly preferred near-infrared cut film is obtained by forming a near-infrared cut layer containing a diimonium compound and a specific copper complex and / or a copper compound on the surface of the base film. It can be formed by dispersing a diimonium compound and a copper complex and / or a copper compound, coating the surface of the transparent substrate with a coating solution that has been diluted with an appropriate solvent and adjusting the concentration, and then drying the coating film. .

  The near-infrared cut film may be provided with a layer composed of two or more near-infrared cut layers, preferably two or more near-infrared absorber layers, on the base film. It is advantageous in that extremely good near-infrared cut performance can be obtained in a wide wavelength range.

  Two or more near-infrared cut films can be configured as follows.

Combined use of a near-infrared cut film having a near-infrared cut layer formed on the base film and a near-infrared cut film having a near-infrared cut layer formed on the base film;
A near-infrared cut film having a near-infrared cut layer formed on one side of the base film and a near-infrared cut layer formed on the other side;
A near infrared cut film in which a near infrared cut layer and a near infrared cut layer are laminated on a base film;
Near-infrared cut film having a near-infrared cut layer formed on the base film;
Any combination of two or more of the above.

  In the above configuration, it is preferable that one of the near-infrared cut layers is a layer containing a diimonium compound and a copper complex and / or a copper compound, and the other is a different layer.

  Moreover, in said structure, it is preferable to make a near-infrared cut layer into a layer containing a diimonium type compound, a copper complex, and / or a copper compound, and to mix | blend a different near-infrared absorber as needed.

  In the present invention, as a near infrared cut layer other than a layer containing a diimonium compound and a copper complex and / or a copper compound, the following may be used alone or in combination of two or more. This is preferable because good near-infrared cut performance (for example, performance to sufficiently absorb near-infrared light in a wide wavelength range of near-infrared such as 850 to 1250 nm) can be obtained without impairing the brightness.

  (A) ITO coating layer having a thickness of 100 to 5000 mm, (b) coating layer made of an alternating laminate of ITO and silver having a thickness of 100 to 10,000 mm, and (c) a nickel complex system and imonium having a thickness of 0.5 to 50 μm. A coating layer in which a mixed material of the system is formed into a film using an appropriate transparent base polymer; (d) a copper compound containing divalent copper ions having a thickness of 10 to 10,000 μm is formed into a film using an appropriate transparent base polymer; (E) an organic dye-based coating layer having a thickness of 0.5 to 50 μm.

  The protective layer is preferably formed in the same manner as the hard coat layer.

  As a material for the release sheet, a transparent polymer having a glass transition temperature of 50 ° C. or higher is preferable. Examples of such a material include polyester resins such as polyethylene terephthalate, polycyclohexylene terephthalate, and polyethylene naphthalate, nylon 46, and modified nylon. In addition to polyamide resins such as 6T, nylon MXD6, polyphthalamide, ketone resins such as polyphenylene sulfide and polythioether sulfone, and sulfone resins such as polysulfone and polyether sulfone, polyether nitrile, polyarylate, poly Resins based on polymers such as ether imide, polyamide imide, polycarbonate, polymethyl methacrylate, triacetyl cellulose, polystyrene and polyvinyl chloride can be used. . Of these, polycarbonate, polymethyl methacrylate, polyvinyl chloride, polystyrene, and polyethylene terephthalate can be suitably used. The thickness is preferably 10 to 200 μm, particularly preferably 30 to 100 μm.

  In the optical filter of the present invention, for example, the first adhesive layer is formed by applying the second adhesive layer to the second transparent film in which the antireflection film is formed as the functional layer, and the conductive layer is formed as the functional layer. A second adhesive layer is formed on the transparent film by coating, and the first and second transparent films are arranged so that the conductive layer and the second adhesive layer face each other, and are overlapped, and if necessary, reduced pressure and Degassing under heating and pressure bonding, or after overlapping, degassing under reduced pressure and heating and heating (hardening if necessary) the adhesive layer by heating or light irradiation By doing so, it can be easily manufactured. Alternatively, the above-described two transparent films can be continuously transported, overlapped, thermocompression-bonded, and continuously manufactured. The same can be done when three transparent films are laminated and pressure-bonded.

  The optical filter of the present invention thus obtained is used by being bonded to the surface of an image display glass plate of a display such as a PDP as shown in FIG. FIG. 7 shows a state in which the optical filter shown in FIG. 2 is stuck on the image display glass plate 70 on the display surface via the first adhesive layer 23A.

  Since the PDP display device of the present invention can directly bond the optical filter of the present invention to the surface of the glass plate by using a plastic film as a transparent substrate, the PDP itself can be reduced in weight, thickness, This can contribute to cost reduction. Compared with the case where a front plate made of a transparent molded body is installed on the front side of the PDP, an air layer having a low refractive index can be eliminated between the PDP and the PDP filter, so that visible light reflection due to interface reflection can be achieved. Problems such as an increase in rate and double reflection can be solved, and the visibility of the PDP can be further improved. In the present invention, since the specific adhesive layer is provided, the PDP has a function of protecting the PDP against a large external impact because it has a relaxation property against a high impact force.

  Therefore, the optical filter of the present invention has an excellent antireflection effect and antistatic property, hardly emits dangerous electromagnetic waves, and has a large protection function against impacts. It can be said.

EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not limited to a following example.
[Example 1] (two-layer structure)
(1) Second transparent film with functional layer (upper layer)
(1-1) Preparation of second adhesive layer forming composition (ultraviolet curable (meth) acrylate composition) In 100 parts by mass of ethyl acetate, 95 parts by mass of 2-ethylhexyl acrylate, 0.5 parts by mass 2 parts by weight of 2-hydroxyethyl methacrylate and 5 parts by weight of acrylic acid were added and dispersed, and further 0.1 parts by weight of benzyl methyl ketal (photopolymerization initiator) and 0.01 parts by weight of 2-mercaptoethanol were added. The mixture was added and sufficiently stirred to prepare a second adhesive layer forming composition (coating solution).

(1-2) Production of PET film with hard coat layer (second transparent film) Silica fine particle-dispersed ultraviolet curable resin (trade name: Z7501; manufactured by JSR Corporation) on one surface of a 188 μm thick PET film After coating and drying a hard coat layer forming coating solution (silica content: 51 mass% (solid content)) made of an ultraviolet curable resin (resin composition having an acryloyl group) dispersed therein with a gravure coater Then, it was cured by ultraviolet irradiation to form a hard coat layer having a thickness of 6 μm.

(1-3) Formation of second adhesive layer The obtained second adhesive layer-forming composition (coating solution) was applied to the surface of the PET film with a hard coat layer that was not provided with a hard coat layer. Further, another peelable PET film was placed thereon, and ultraviolet rays were irradiated from above the peeled film with an ultraviolet lamp until the total accumulated light amount reached 1100 mJ / cm ² . Thereby, the 2nd composition for adhesion layer formation photopolymerized, and obtained the 2nd adhesion layer (2nd transparent film with the 2nd adhesion layer) of thickness 0.03mm. The obtained second adhesive layer had a storage elastic modulus of 2.2 × 10 ⁵ Pa and a loss elastic modulus of 1.4 × 10 ⁵ Pa at a frequency of 1 Hz at 25 ° C.

(2) First transparent film with a functional layer (lower layer)
(2-1) Preparation of first adhesive layer-forming composition (ultraviolet curable (meth) acrylate composition) 97.5 parts by mass of 2-ethylhexyl acrylate and 2.5 parts by mass of acrylic acid had a polymerization rate of 30 A partial polymer / monomer mixture polymerized to% (mass) was prepared.
To 100 parts by mass of this partial polymer / monomer mixture, 0.2 parts by mass of 2,2-diethoxyacetophenone (photopolymerization initiator), 30 parts by mass of methoxypolypropylene glycol methacrylate (the number of additions of propylene oxide is 9). And 10 parts by mass of 4-hydroxybutyl methacrylate and 0.1 part by mass of trimethylolpropane triacrylate (polyfunctional monomer), and sufficiently stirred to form a first adhesive layer forming composition ( UV curable (meth) acrylate composition coating solution) was prepared.

(2-2) Production of PET film with conductive layer (first transparent film) A 125 μm thick PET film with a copper foil formed on the surface was coated with a photoresist on the copper foil, dried and then meshed. The resist layer was exposed through a patterned mask, developed, and then etched. Thus, a PET film having a conductive layer (mesh pattern metal layer: thickness 10 μm, line width 10 μm, line pitch: 300 μm, aperture ratio: 90%) was obtained.

(2-3) Formation of first adhesive layer (lower layer)
The obtained first adhesive layer forming composition (coating solution) is applied to the surface of the PET film with a conductive layer that is not provided with a conductive layer, and another polyester-based peelable film is mounted thereon. Then, ultraviolet rays were irradiated from above the release film with an ultraviolet lamp until the total accumulated light amount reached 2800 mJ / cm ² . Thereby, the 1st composition for adhesion layer formation photopolymerized, and obtained the 1st adhesion layer (the 1st transparent film with the 1st adhesion layer) of thickness 0.3mm. The obtained second adhesive layer had a storage elastic modulus of 6.1 × 10 ⁴ Pa and a loss elastic modulus of 6.2 × 10 ⁴ Pa at a frequency of 1 Hz at −10 ° C.

(3) Production of optical filter The second transparent film and the first transparent film are placed so that the conductive layer and the second adhesive layer are in contact with each other, and subjected to thermocompression bonding (100 ° C.). An optical filter (see FIG. 2) was prepared.

[Example 2] (Three-layer structure)
(1) Second transparent film with functional layer (upper layer)
A second transparent film with a second adhesive layer and a hard coat layer obtained in the same manner as in Example 1 was used.

(2) First transparent film with a functional layer (lower layer)
A first transparent film with a first adhesive layer and a conductive layer obtained in the same manner as in Example 1 was used.

(3) Third transparent film (middle layer)
In Example 1, in the second transparent film with the second adhesive layer and the hard coat layer, a third transparent film with the third adhesive layer (that is, the first transparent film prepared in the same manner except that the hard coat layer was not provided) 2 and the same as the second transparent film with the adhesive layer).

(4) Production of optical filter comprising three transparent films The third transparent film, the second transparent film, and the first transparent film are arranged so that the conductive layer and the third adhesive layer are in contact with each other. 3 was placed so that the transparent film 3 and the second adhesive layer were in contact with each other, and thermocompression bonded (100 ° C.) to produce the optical filter of the present invention (see FIG. 5).

[Example 3] (Three-layer structure)
(1) Second transparent film with functional layer (upper layer)
The second adhesive layer and the hard coat layer were similarly used except that the same amount of N-methylolacrylamide was used instead of 2-hydroxyethyl methacrylate as the second adhesive layer forming composition used in Example 1. An attached second transparent film was produced.

The thickness of the second adhesive layer obtained by photopolymerizing the second adhesive layer-forming composition is 0.04 mm, and the frequency of the obtained second adhesive layer at 25 ° C. is 1 Hz. The storage elastic modulus was 3.9 × 10 ⁴ Pa and the loss elastic modulus was 4.5 × 10 ⁴ Pa.

(2) First transparent film with a functional layer (lower layer)
In the production of the first adhesive layer used in Example 1, the first adhesive film and the first transparent film with the hard coat layer were produced in the same manner except that the total integrated light amount was changed to 2200 mJ / cm ² . .

The thickness of the obtained 1st adhesion layer is 0.3 mm, and the storage elastic modulus in the frequency of 1 Hz in -10 degreeC of the obtained 1st adhesion layer is 4.1 * 10 < ⁴ > Pa, loss The elastic modulus was 9.1 × 10 ⁴ Pa.

(3) Third transparent film (middle layer)
In the production of the third adhesive layer used in Example 2, a third transparent film with a third adhesive layer and a hard coat layer was produced in the same manner except that the total integrated light amount was changed to 3500 mJ / cm ² . .

The thickness of the obtained 3rd adhesion layer is 0.04mm, and the storage elastic modulus in the frequency of 1 Hz in 25 degreeC of the obtained 3rd adhesion layer is 1.8 * 10 < ⁵ > Pa, loss elasticity The rate was 8.2 × 10 ⁴ Pa.

(4) Production of optical filter The third transparent film, the second transparent film, and the first transparent film are arranged such that the conductive layer and the third adhesive layer are in contact with each other, and the third transparent film and the second transparent film are in contact with each other. The optical filter of the present invention (see FIG. 5) was produced by placing the adhesive layer in contact with each other and thermocompression bonding (100 ° C.).

[Comparative Example 1] (two-layer structure)
(1) Second transparent film with functional layer (upper layer)
A second transparent film with a second adhesive layer and a hard coat layer obtained in the same manner as in Example 1 was prepared.

(2) First transparent film with a functional layer (lower layer)
In the production of the first adhesive layer used in Example 1, the first adhesive film and the first transparent film with a hard coat layer were produced in the same manner except that the total accumulated light amount was changed to 500 mJ / cm ² . .

The thickness of the obtained 1st adhesion layer is 0.3 mm, and the storage elastic modulus in the frequency of 1 Hz in -10 degreeC of the obtained 1st adhesion layer is 7.5 * 10 < ³ > Pa, loss The elastic modulus was 8.9 × 10 ³ Pa.

(3) Production of optical filter comprising two transparent films The second transparent film and the first transparent film were subjected to thermocompression bonding (100 ° C.) in the same manner as in Example 1 to obtain an optical filter (see FIG. 2). ) Was produced.
[Comparative Example 2] (two-layer structure)
(1) Second transparent film with functional layer (upper layer)
In the production of the first adhesive layer used in Example 1, the first adhesive film and the first transparent film with a hard coat layer were produced in the same manner except that the total accumulated light amount was changed to 500 mJ / cm ² . .

The thickness of the obtained first adhesive layer was 0.03 mm, and the storage modulus of the obtained first adhesive layer at a frequency of 1 Hz at 25 ° C. was 4.0 × 10 ³ Pa. The rate was 5.5 × 10 ⁴ Pa.

(2) First transparent film with a functional layer (lower layer)
A first transparent film with a first adhesive layer and a hard coat layer obtained in the same manner as in Example 1 was prepared.

(3) Production of optical filter comprising two transparent films The second transparent film and the first transparent film were subjected to thermocompression bonding (100 ° C.) in the same manner as in Example 1 (see FIG. 2). ) Was produced.

[Comparative Example 3] (Three-layer structure)
(1) Second transparent film with functional layer (upper layer)
(1-1) Preparation of second adhesive layer forming composition (ultraviolet curable (meth) acrylate composition) 50 parts by mass of n-butyl acrylate, 0.2 parts by mass in 100 parts by mass of ethyl acetate 2-hydroxyethyl acrylate and 0.2 part by mass of azobisisobutyronitrile were added and mixed, and stirred sufficiently while heating so as not to exceed 70 ° C. The second adhesive layer forming composition A product (coating solution) was prepared.

(1-3) Formation of Second Adhesive Layer The obtained second adhesive layer forming composition (coating solution) was provided with a hard coat layer of a PET film with a hard coat layer used in Example 1. Then, another peelable PET film was placed thereon, and ultraviolet rays were irradiated on the release film with an ultraviolet lamp until the total accumulated light amount reached 1400 mJ / cm ² . Thereby, the 2nd composition for adhesion layer formation photopolymerized, and obtained the 2nd adhesion layer (2nd transparent film with the 2nd adhesion layer) of thickness 0.03mm. The obtained second adhesive layer had a storage elastic modulus of 4.5 × 10 ⁶ Pa at a frequency of 1 Hz at 25 ° C. and a loss elastic modulus of 1.3 × 10 ⁶ Pa.

(2) First transparent film with a functional layer (lower layer)
In preparation of the 1st adhesion layer used in Example 1, it changed similarly that the usage-amount of acrylic acid was changed from 2.5 mass% to 25 mass%, and the total integrated light quantity was changed to 1000 mJ / cm < ² >. Thus, a first transparent film with a first adhesive layer and a hard coat layer was produced.

The thickness of the obtained 1st adhesion layer is 0.3 mm, and the storage elastic modulus in the frequency of 1 Hz in -10 degreeC of the obtained 3rd adhesion layer is 5.5 * 10 < ⁴ > Pa, loss The elastic modulus was 3.1 × 10 ⁵ Pa.

(3) Third transparent film (middle layer)
The same film as the second transparent film (upper layer) of (1) above was used.

(4) Production of optical filter The third transparent film, the second transparent film, and the first transparent film are arranged such that the conductive layer and the third adhesive layer are in contact with each other, and the third transparent film and the second transparent film are in contact with each other. The optical filter of the present invention (see FIG. 5) was produced by placing the adhesive layer in contact with each other and thermocompression bonding (100 ° C.).

[Evaluation of adhesive layer]
(1) Dynamic storage elastic modulus and dynamic loss elastic modulus The dynamic storage elastic modulus and dynamic loss elastic modulus were measured according to the following methods.

  Using the shock-absorbing layers obtained in Examples and Comparative Examples, using RDA3 (manufactured by Rheometric Scientific Co.) as a viscoelasticity measuring device, measuring thickness 1 with a parallel disk-shaped jig of φ = 8 mm It was measured at a temperature dispersion range of −60 to 100 ° C., a temperature rising temperature of 2 ° C./min and a frequency of 1 Hz at 0.0 mm.

(2) Impact resistance Preparation of sample The optical filters (10 cm square) obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were stacked on a 10 cm square glass plate having a thickness of 2.5 mm, and on top of that. A 10 cm square PET film (2.5 cm × 2.5 cm) having a thickness of 188 μm was stacked and pressed to obtain a three-layer laminate.

  As shown in FIG. 8, a 10 mm thick iron plate is placed on a concrete floor, a paper file (# 150) is placed on the steel plate so that the sample can be fixed thereon, and the sample (10 cm square thickness) is placed thereon. Damage to the glass plate by placing an adhesive layer and a 188 μm thick PET film on a 2.5 mm glass plate and applying a spring impact hammer with a predetermined impact force from the PET film Was observed.

The predetermined impact force was 0.20J, 0.35J, 0.50J, 0.70J, 1.00J. Five samples were prepared for each example, and the test was evaluated as follows.
○: No cracks were observed in the sample glass.
X: Cracks were observed in the glass of one or more samples.

(3) Pencil hardness Based on JIS-K-5400, the pencil hardness of the surface (surface of a hard-coat layer) of the obtained optical filter was measured. As a measuring device, a surface property tester (type: 14 FW) manufactured by Shinto Kagaku Co., Ltd. was used.

  The results are shown in Table 1.

  Moreover, the PDP filter which has the adhesion layer which satisfy | fills the specific elasticity modulus range of this invention obtained in Examples 1-3 showed the characteristic outstanding in impact resistance and surface hardness. On the other hand, the PDP filter (Comparative Examples 1 and 2) having an adhesive layer that does not satisfy the elastic modulus range of the present invention was not sufficient in impact resistance and surface hardness. The PDP filter of Comparative Example 3 uses three transparent films and has a relatively good surface hardness, but has insufficient impact resistance.

  Even when the filters obtained in the examples were actually applied to the PDP, they were not inferior to conventional ones such as transparency and electromagnetic shielding properties. Therefore, it can be seen that even if the adhesive layer of the present invention is provided, the characteristics required for the optical filter for PDP are not impaired.

It is a schematic sectional drawing of an example which shows the basic composition of the optical filter of this invention. It is a schematic sectional drawing of an example of the preferable aspect in the optical filter of this invention. It is a schematic sectional drawing of an example of another aspect in the optical filter of this invention. It is a schematic sectional drawing of an example which shows another basic composition of the optical filter of this invention. FIG. 5 is a schematic cross-sectional view of another example of a preferred embodiment in the optical filter of FIG. FIG. 5 is a schematic cross-sectional view of an example of a preferred embodiment in the optical filter of FIG. It is a schematic sectional drawing of an example which shows the basic composition of the display which has the optical filter of this invention. It is a schematic sectional drawing for demonstrating the impact resistance test in an Example.

Explanation of symbols

11A, 21A, 31A, 41A, 51A, 61A First transparent film 11B, 21B, 31B, 41B, 51B, 61B Second transparent film 51C, 61C Third transparent film 12, 22, 32, 42, 52, 62 Conductive layer 13A, 23A, 33A, 43A, 53A, 63A First adhesive layer 13B, 23B, 33B, 43B, 53B, 63B Second adhesive layer 53C, 63C Third adhesive layer 14, 24, 34, 44 , 54, 64 Antireflection film

Claims (31)

An optical filter comprising a laminate comprising a first adhesive layer, a first transparent film having a functional layer, a second adhesive layer, and a second transparent film having a functional layer in this order. And
The first adhesive layer has a storage elastic modulus in a range of 1 × 10 ³ to 1 × 10 ⁶ Pa at a frequency of 1 Hz at −10 ° C. and a loss elastic modulus of 1 × 10 ^{3 to} 3 × 10 ⁵ Pa. The storage elastic modulus of the second adhesive layer at a frequency of 1 Hz at 25 ° C. is in the range of 1 × 10 ⁴ to 1 × 10 ⁶ Pa, and the loss elastic modulus is 1 × 10 ^{4 to} 3 ×. An optical filter having a range of 10 ⁶ Pa. Between the first transparent film having the functional layer and the second adhesive layer, the third transparent film which may have the third adhesive layer and the functional layer is the third adhesive layer. It is provided so that the third transparent film is located on the first transparent film,
The third adhesive layer has a storage elastic modulus in the range of 1 × 10 ⁴ to 1 × 10 ⁶ Pa at a frequency of 1 Hz at 25 ° C. and a loss elastic modulus in the range of 1 × 10 ^{4 to} 3 × 10 ⁶ Pa. The optical filter according to claim 1. The first adhesive layer has a storage elastic modulus in the range of 1 × 10 ⁴ to 1 × 10 ⁵ Pa at a frequency of 1 Hz at −10 ° C. and a dynamic loss elastic modulus of 5 × 10 ³ to 1 × 10 ^5. The optical filter according to claim 1 or 2, which is in a range of Pa. The storage elastic modulus of the second adhesive layer at a frequency of 1 Hz at 25 ° C. is in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa, and the loss elastic modulus is in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa. The optical filter according to claim 1 or 2. The third adhesive layer has a storage elastic modulus in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa at a frequency of 1 Hz at 25 ° C., and a loss elastic modulus in the range of 5 × 10 ^{4 to} 5 × 10 ⁵ Pa. The optical filter according to any one of claims 2 to 4.   The optical filter according to claim 1, 3 or 4, wherein the functional layer of the first transparent film and the second adhesive layer are in contact with each other.   The optical filter according to claim 2, wherein the functional layer of the first transparent film is in contact with the third adhesive layer. Even when the storage elastic modulus value of the second adhesive layer is greater than, equal to, or smaller than the storage elastic modulus value of the first adhesive layer, it is small in the range of 9 × 10 ³ Pa or less, and the second The value of the loss elastic modulus of the pressure-sensitive adhesive layer is larger than the value of the loss elastic modulus of the first pressure-sensitive adhesive layer, or even when it is the same or smaller, it is small in the range of 5 × 10 ³ Pa or less. The optical filter according to item 1. Even if the value of the storage elastic modulus of the third adhesive layer is larger than the value of the storage elastic modulus of the first adhesive layer, or is the same or smaller, it is smaller in the range of 9 × 10 ³ Pa or less, and the third The value of the loss elastic modulus of the pressure-sensitive adhesive layer is larger than the value of the loss elastic modulus of the first pressure-sensitive adhesive layer, or even when it is the same or smaller, it is small in the range of 5 × 10 ³ Pa or less. The optical filter according to item 1.   The optical filter according to any one of claims 1 to 9, wherein the functional layer of the first transparent film is a conductive layer.   The optical filter according to claim 1, wherein the functional layer of the second transparent film is an antireflection film.   The optical filter according to claim 1, wherein the adhesive layer is made of an acrylic resin.   The optical filter according to claim 12, comprising at least an alkyl acrylate (provided that the alkyl group has 4 to 10 carbon atoms) and acrylic acid as monomers constituting the acrylic resin.   The optical filter according to claim 13, comprising at least 2-ethylhexyl acrylate and acrylic acid as monomers constituting the acrylic resin.   The optical filter according to claim 13 or 14, further comprising trimethylolpropane triacrylate as a monomer constituting the acrylic resin used in the first adhesive layer.   The monomer which comprises the acrylic resin used for a 1st adhesion layer contains the alkoxy polyalkylene glycol (meth) acrylate and the hydroxyl-containing (meth) acrylate further, The any one of Claims 13-15. Optical filter.   The optical according to any one of claims 13 to 16, further comprising 2-hydroxylethyl methacrylate or N-methylolacrylamide as a monomer constituting the acrylic resin used in the second or third adhesive layer. filter.   The first adhesive layer cures a partial polymer / monomer mixture obtained by partially polymerizing a monomer mixture containing alkyl acrylate (wherein the alkyl group has 4 to 10 carbon atoms) and acrylic acid. The optical filter according to claim 1, wherein the optical filter is a layer.   The layer thickness of the first adhesive layer is in the range of 0.05 to 1.0 mm, and the layer thickness of the second or third adhesive layer is in the range of 0.005 to 0.1 mm. The optical filter according to any one of 18.   The optical filter according to any one of claims 2 to 19, wherein the functional layer of the third transparent film which may have a functional layer is a near-infrared shielding layer.   The optical filter according to any one of claims 1 to 20, wherein a transparent film having a near-infrared shielding layer is provided on a surface of the first adhesive layer that is not in contact with the first transparent film.   The optical filter according to any one of claims 11 to 21, wherein the antireflection film has a near-infrared shielding function.   The optical filter according to claim 10, wherein the conductive layer has an electromagnetic wave shielding function.   The optical filter according to any one of claims 10 to 23, wherein the conductive layer is a mesh-like metal layer or a metal-containing layer.   The optical filter according to claim 24, wherein a first adhesive layer is embedded in a gap between meshes of the mesh-like metal layer.   The optical filter according to claim 1, wherein the transparent film is a plastic film.   The optical filter according to any one of claims 1 to 26, wherein a release sheet is provided on the first adhesive layer.   The optical filter according to any one of claims 11 to 27, wherein a protective layer is provided on the antireflection film.   It is a filter for plasma display panels, The optical filter of any one of Claims 1-28.   A display comprising the optical filter according to any one of claims 1 to 28 bonded to a surface of an image display glass plate. A plasma display panel, wherein the optical filter according to any one of claims 1 to 28 is bonded to a surface of an image display glass plate.

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