JP4972368B2 - Optical filter for display, display having the same, and plasma display panel - Google Patents

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, near-infrared shielding, electromagnetic wave shielding, and the like, 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 the mainstream of displays, and PDPs have become common as liquid crystal displays as large screen display devices. PDP has advantages such as faster response speed than liquid crystal display. However, in this PDP, high-frequency pulse discharge is performed on the light emitting part for image display, which may cause unnecessary electromagnetic wave radiation and infrared radiation which may cause malfunction of the infrared remote controller, etc. For this purpose, various PDP filters (electromagnetic wave shielding light transmitting window materials) having conductivity have been proposed for PDP. As the conductive layer of the electromagnetic wave shielding light transmitting window material, for example, (1) a transparent conductive thin film containing metallic silver, (2) a conductive mesh in which a metal wire or conductive fiber is made into a net, (3) on a transparent film Known are those in which a layer of copper foil or the like is etched into a net and an opening is provided, and (4) a conductive ink is printed in a mesh on a transparent film.

  However, the transparent conductive thin film of (1) has a drawback that sufficient conductivity cannot be obtained, and the conductive mesh of (2) generally has a defect that good light transmittance cannot be obtained. Since the desired mesh-like conductive layer can be formed by the etching process of (3) and (4) pattern printing, the line width and spacing, the degree of freedom of the mesh shape is much larger than that of the conductive mesh, Even a mesh-like conductive layer with a thin line having a line width of 200 μm or less and an aperture ratio of 75% or more and a high aperture ratio can be formed. However, (3) is disadvantageous in that it requires equipment for the etching process, and the process is complicated and expensive. On the other hand, (4) mesh-like pattern printing is particularly easy and advantageous for the formation of the conductive layer described above. And the moire phenomenon can be prevented. However, in the printing of the conductive ink (4), it is necessary to sufficiently increase the viscosity of the ink in order to maintain the dispersion state of the conductive fine particles in the ink. Therefore, the ink line width is remarkably increased. The aperture ratio could not be reduced, and the aperture ratio could not be increased significantly.

  In the above-mentioned electromagnetic shielding light transmitting window material, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 11-119678), the conductive mesh (mesh-like metal foil) described in (3) above is provided between two transparent substrates. ), And an electromagnetic wave shielding light transmission window material formed by joining and integrating with a transparent adhesive. As such an adhesive, a thermoplastic resin such as ethylene vinyl acetate copolymer (EVA) is used.

  In addition, in order to significantly increase the aperture ratio, a method for forming a mesh-like conductive layer obtained by improving the pattern printing method (4) is described in Patent Document 2 (Japanese Patent Laid-Open No. 2001-332889). That is, a method of manufacturing an electromagnetic wave shielding light-transmitting window material having a mesh-like conductive layer having a sufficiently small line width and a very high aperture ratio. The manufacturing method is soluble in water on the film surface. In this method, dots are formed by a material, a conductive material layer made of a conductive material insoluble in water is formed on the film surface, and the film surface is brought into contact with water to remove the dots and the conductive material layer on the dots. Yes (hereinafter referred to as printing mesh method).

  In an optical filter such as an electromagnetic wave shielding light transmitting window material, a near-infrared absorbing layer is generally provided in order to block unnecessary light such as neon light emission and to prevent malfunction of the remote controller. Such an optical filter is described in Patent Document 3 (Japanese Patent Laid-Open No. 2006-153955). That is, a transparent substrate, an antireflection layer formed on one surface thereof, an electromagnetic wave shielding layer formed on the other surface of the transparent substrate, and a near infrared shielding layer formed on the electromagnetic wave shielding layer And an optical filter in which an adhesive layer formed on the near-infrared shielding layer is laminated into an integral film.

Japanese Patent Laid-Open No. 11-74683 JP 2001-332889 A JP 2006-153955 A

  As shown in Patent Document 1, the mesh metal foil is interposed between two transparent substrates and joined and integrated with a thermoplastic resin such as EVA, and the mesh metal foil is used as a transparent substrate. A thermoplastic resin such as EVA is used for fixing. Moreover, the mesh-shaped conductive material layer formed by the printing mesh method described in Patent Document 2 is directly formed on the transparent film.

  Further, in the optical filter provided with the near infrared shielding layer (that is, the near infrared absorbing layer) formed on the electromagnetic shielding layer described in Patent Document 3, the mesh-like conductive layer as the electromagnetic shielding layer is a transparent substrate. It is formed as it is.

  However, according to the study by the present inventor, not only the mesh-shaped metal foil described in Patent Document 1 but also a mesh-shaped conductive material layer having a high aperture ratio by the printed mesh method as described in Patent Document 2 is provided on the transparent film. In this case, in order to maintain the adhesion between the transparent film and the mesh-like conductive layer, it is necessary to provide an intermediate layer as in Patent Document 1, and the type of functional layer provided on the intermediate layer Thus, it was found that a specific intermediate layer corresponding to each functional layer is necessary. Furthermore, as a result of repeated studies by the present inventor, in an optical filter provided with a near-infrared shielding layer (that is, a near-infrared absorbing layer) formed on an electromagnetic wave shielding layer described in Patent Document 3, the configuration of the intermediate layer It has been found that depending on the component, the dye contained in the near-infrared absorbing layer is deteriorated and the function of the near-infrared absorbing layer is impaired.

  Accordingly, an object of the present invention is to provide an optical filter for display that is easy to manufacture, lightweight and thin, excellent in electromagnetic wave shielding properties and near infrared shielding properties, and excellent in durability.

  Another object of the present invention is to provide an optical filter suitable for PDP that is easy to manufacture, lightweight and thin, has excellent electromagnetic shielding properties and near infrared shielding properties, and has excellent durability.

  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.

  In the optical filter provided with the near-infrared shielding layer (that is, the near-infrared absorbing layer) formed on the electromagnetic wave shielding layer described in Patent Document 3, as described above, the inventors have studied the intermediate layer. It has been found that depending on the constituent components, the dye contained in the near-infrared absorbing layer is deteriorated and the function of the near-infrared absorbing layer is impaired. And after further investigation, by using a specific resin component, without impairing the function of the near-infrared absorbing layer, excellent adhesive properties (transparent film and mesh-like conductive layer, and transparent film and near-infrared absorbing layer) I was able to hold

Therefore, the present invention
An optical filter for display comprising at least one transparent film, a mesh-like conductive layer provided on one transparent film, and a near-infrared absorbing layer provided on the mesh-like conductive layer,
Intermediate layer is provided between the transparent film and the mesh-shaped conductive layer, it viewed including the intermediate layer is a polyester resin, and does not include a polyisocyanate,
The polyester resin of the intermediate layer contains 2,2-dimethyl-1,3-propanediol as a glycol component, and is selected from terephthalic acid, isophthalic acid, adipic acid, azelaic acid and sebacic acid as a polyvalent carboxylic acid And at least one optical filter for display, and
An optical filter for display in which a mesh-like conductive layer and a near-infrared absorbing layer are provided in this order on one surface of a transparent film, and a hard coat layer is provided on the other surface,
Intermediate layer is provided between the transparent film and the mesh-shaped conductive layer, it viewed including the intermediate layer is a polyester resin, and does not include a polyisocyanate,
The polyester resin of the intermediate layer contains 2,2-dimethyl-1,3-propanediol as a glycol component, and is selected from terephthalic acid, isophthalic acid, adipic acid, azelaic acid and sebacic acid as a polyvalent carboxylic acid An optical filter for display , comprising at least one selected from the above-mentioned .
;It is in.
Polyisocyanate has a strong tendency to deteriorate the coloring matter (dye) constituting near-infrared absorption. In addition, the polyester resin intermediate layer having the above-described configuration is particularly excellent in adhesion to the transparent film, the mesh-like conductive layer, and the near-infrared absorbing layer. Furthermore, when the glycol component contains 2,2-dimethyl-1,3-propanediol (neopentyl glycol), the adhesiveness is further improved. Furthermore, the pigment is hardly deteriorated.
The weight average molecular weight of the polyester resin is generally in the range of 1000 to 50000, particularly preferably in the range of 2000 to 20000. The number average molecular weight is generally in the range of 1000 to 50000, particularly preferably in the range of 2000 to 20000.

Preferred embodiments of the optical filter for display of the present invention are as follows.
(1 ) The mesh-like conductive layer is made of a mesh-like metal film or a metal vapor deposition film. The layer thickness is generally 1 to 200 μm.
In the case of a mesh-like metal film, the layer thickness is generally 1 to 200 μm, particularly 1 to 50 μm.
In the case of a metal vapor deposition film, it is 1-10 micrometers, Preferably it is 2-8 micrometers, Especially 3-6 micrometers. In this case, it is easy for the hard coat layer to completely cover the concave portions of the mesh-like conductive layer.
Instead of the metal vapor deposition film, a conductive material layer (eg, a coating layer in which conductive particles of an inorganic compound are dispersed in a polymer) may be used. Furthermore, the metal vapor deposition film or the electroconductive layer by coating, and the plating layer provided on it may be sufficient.
( 2 ) A low refractive index layer having a refractive index lower than that of the hard coat layer is formed on the hard coat layer. Good antireflection properties can be obtained.
( 3 ) The pressure-sensitive adhesive layer is provided on the surface of the near-infrared absorbing layer on the side opposite to the transparent film. Mounting on the display becomes easy. The near infrared absorbing layer may have adhesiveness.
( 4 ) The transparent film is a plastic film.
( 5 ) A release sheet is provided on the pressure-sensitive adhesive layer or the pressure-sensitive near-infrared absorbing layer. Mounting on the display becomes easy.
( 6 ) A filter for a plasma display panel.

Furthermore, the present invention provides
A display characterized in that the optical filter for display is bonded to the surface of the image display glass plate; and a plasma characterized in that the optical filter for display is bonded to the surface of the image display glass plate It is also on the display panel.

  The optical filter for display of the present invention is an optical filter that is easy to manufacture, lightweight, thin, excellent in electromagnetic wave shielding properties and near infrared shielding properties, and excellent in durability. In the present invention, in an optical filter laminated in a state in which a mesh-like conductive layer and a near infrared absorption layer are in direct contact as an electromagnetic wave shielding layer, long-term stable adhesion between each layer, and long-term near-infrared shielding properties Is possible. Therefore, the mesh-like conductive layer and the near-infrared absorbing layer are provided on the transparent film via a specific intermediate layer without directly contacting the transparent film as the transparent substrate to the mesh-like conductive layer and the near-infrared absorbing layer. As a result, excellent durability that can maintain the above excellent adhesiveness and near-infrared shielding properties for a long period of time is obtained.

  In addition, by adopting the configuration as described above, the optical filter itself can be thinned. For example, when the optical filter is obtained using a single transparent film, the thickness of the optical filter is extremely small. Accordingly, the mass is also reduced, which is extremely advantageous in handling when the display is mounted and after mounting.

  Therefore, the optical filter for display of the present invention includes a field emission display (FED) including a plasma display panel (PDP), a cathode ray tube (CRT) display, a liquid crystal display, an organic EL (electroluminescence) display, and a surface electric field display (SED). It can be said that the optical filter has various functions such as anti-reflection, near-infrared shielding, and electromagnetic wave shielding for various displays such as).

  The optical filter for display according to the present invention, which has excellent electromagnetic shielding properties and near infrared shielding properties and excellent durability, will be described in detail below.

  FIG. 1 shows a schematic sectional view of an example showing the basic structure of the optical filter for display of the present invention. In FIG. 1, an intermediate layer 13, a mesh-like conductive layer 14, a near-infrared absorbing layer 15 and an adhesive layer 16 are provided in this order on one surface of a transparent film 12, and a hard coat is provided on the other surface. An antireflection layer 18 such as a layer 17 and a low refractive index layer is provided. In this configuration, the antireflection property is slightly inferior, but the antireflection layer 18 may be omitted. In some cases, the hard coat layer 17 and the antireflective layer 18 such as a low refractive index layer can be used depending on the application even without both. Further, the pressure-sensitive adhesive layer 16 may be omitted. Further, when the mesh-like conductive layer 14 is thin (generally in the case of a printing mesh method), it may be possible to cover the concave portion with the near-infrared absorbing layer 15. However, since the near-infrared absorbing layer 15 is usually a thin layer, it is formed along the irregularities of the mesh-like conductive layer.

The intermediate layer 13 is a layer containing a polyester resin, and is preferably composed of a polyester resin. In particular, the curing agent, Ru polyester resin der free inter alia polyisocyanate. By using such an intermediate layer, long-term stable adhesion between each layer of the transparent film and the mesh-like conductive layer or near-infrared absorbing layer is ensured, and long-term retention of near-infrared shielding is maintained. It is possible. Details of the intermediate layer will be described later.

  The mesh conductive layer 14 is generally a mesh-like metal layer or metal-containing layer. The mesh-like metal layer or metal-containing layer is generally formed by etching or by a printing method, particularly the mesh printing method. In particular, when the mesh printing method is used, it is easy to obtain a high aperture ratio. The layer thickness of the mesh metal film is generally 1 to 200 μm. In the case of an etching metal layer, it is preferably 1 to 200 μm, particularly 1 to 50 μm. In the case of a mesh printing method (eg, a metal vapor deposition film), it is preferably 1 to 10 μm, preferably 2 to 8 μm, particularly 3 to 6 μm. In the case of a thin layer formed by the printing mesh method, it is generally a metal vapor-deposited film, but it may be a conductive layer by coating (eg, a coating layer in which conductive particles of an inorganic compound are dispersed in a polymer). . Furthermore, the metal vapor deposition film or the electroconductive layer by coating, and the plating layer provided on it may be sufficient.

  The near-infrared absorbing layer 15 has a function of blocking unnecessary light such as neon light emission (585 nm). The near-infrared absorbing layer 15 is generally a layer that is provided for the purpose of blocking near-infrared rays and preventing a malfunction of the remote controller and includes a dye having an absorption maximum at 800 to 1200 nm. The pressure-sensitive adhesive layer 16 is generally provided for easy mounting on a display. A release sheet may be provided on the pressure-sensitive adhesive layer 16.

  The antireflection layer 17 is generally a low refractive index layer. That is, the antireflection effect is exhibited by the composite film of the hard coat layer 16 and the low refractive index layer provided thereon. A high refractive index layer may be provided between the low refractive index layer and the hard coat layer 16. This improves the antireflection function.

  Further, the antireflection layer 17 may not be provided, and only the transparent film and the hard coat layer 16 having a refractive index higher or lower (preferably lower) than that of the transparent film may be used. The hard coat layer 16 and the antireflection layer 17 are preferably formed by coating from the viewpoints of productivity and economy.

  The above-mentioned optical filter for display, for example, forms an intermediate layer, a mesh-like conductive layer, a near-infrared absorbing layer, and an adhesive layer on one surface of a long plastic film, and a hard coat layer and an adhesive layer on the other surface. A long near-infrared cut film including an intermediate layer and a mesh-like conductive layer and a long antireflection film are formed by forming an antireflection layer, and these are laminated via an adhesive. Thus, a long optical filter is obtained, and then the produced filter is obtained by cutting into a rectangular shape in accordance with the shape of the display portion on the entire surface of each display.

  In the case of a rectangular transparent film, each layer may be formed in a batch system. However, as described above, it is preferable to form each layer on a continuous film, in a roll-to-roll system, and to cut the layers.

  The materials used for the optical filter for display of the present invention will be described in detail 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, but is generally 1 μm to 10 mm, 1 μm to 5 mm, and particularly preferably 25 to 250 μm.

  The conductive layer of the present invention is set so that the surface resistance value of the obtained optical filter is generally 10Ω / □ or less, preferably 0.001 to 5Ω / □, particularly 0.005 to 5Ω / □. Is done.

  As described above, the mesh-like conductive layer is formed by the printing mesh method, but the copper foil layer on the transparent film is etched into a net-like shape, and an opening is provided. 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 40 to 95%. A more preferable wire diameter is 10 to 500 μm, and an aperture ratio is 50 to 95%. When the wire diameter exceeds 1 mm in the mesh-like conductive layer, the electromagnetic wave shielding property is improved, but the aperture ratio is lowered and cannot be made compatible. If it is less than 1 μm, the strength as a mesh is lowered and handling becomes difficult. Further, when the aperture ratio exceeds 95%, it is difficult to maintain the shape as a mesh. When the aperture ratio is less than 40%, the light transmittance is reduced, and the light amount from the display is also reduced.

  The opening ratio of the conductive mesh refers to the area ratio occupied by the opening portion in the projected area of the conductive mesh.

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

  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 film obtained, and the time required for the etching process becomes long. In general, the thickness is preferably 1 to 200 μm, particularly 1 to 50 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 substrate. 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.

  The thickness of the printed film formed in this way is not preferable because the electromagnetic wave shielding property is insufficient if it is too thin, and if it is too thick, it affects the thickness of the resulting film, so it 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%.

  In the present invention, the mesh-like conductive layer is also preferably formed by the printing mesh method as described above.

  About the said printing mesh method, the schematic explaining the formation method of the conductive layer in FIG. 2 is shown. First, as shown in (1), the intermediate layer-forming coating solution is applied onto the transparent film 1 and dried to form the intermediate layer 3. Next, as shown in (2), water or the like is formed on the intermediate layer 3. The dots 2 are printed using a material soluble in the solvent. Next, as shown in (3), the conductive material layer 4 is formed so as to cover all of the exposed surface of the intermediate layer 3 above and between the dots 2 of the transparent film 1. The conductive material layer 4 is also provided on the dots, but if it is too thick, the dots cannot be removed by subsequent cleaning. Next, the transparent film 1 is washed with a solvent such as water. At this time, if necessary, dissolution accelerating means such as ultrasonic irradiation, rubbing with a brush, sponge or the like may be used in combination. The conductive material layer 4 is preferably formed by vapor deposition of metal because low resistance is easily obtained.

  By the washing, the soluble dots 2 are dissolved as shown in (4), and the conductive material on the dots 2 is also peeled off from the transparent film 1 and removed. Then, a conductive pattern (mesh-like conductive layer) 5 made of a conductive material formed in a region between the dots remains on the transparent film 1. Since the conductive pattern 5 occupies the area between the dots 1, the conductive pattern 5 has a mesh shape (lattice shape) as a whole.

  Therefore, by making the gap between the dots 2 narrow, a grid-like conductive pattern 5 having a small line width is formed. Further, by increasing the area of each dot 2, a mesh-like conductive pattern 5 having a large aperture ratio is formed. The printing material soluble in water or the like for forming the dots 2 does not require fine particles to be dispersed, and even a low viscosity material can be used sufficiently. By using this low-viscosity printing material, dots can be printed so as to have a fine dot pattern.

  After the step (4), the conductive layer can be obtained by performing final cleaning (rinsing) and drying, if necessary.

  Examples of the conductive layer formed by coating in the printing mesh method 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.

  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 substrate. 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 may not be sufficient. On the other hand, when the thickness exceeds 5 μm, the transparency of the resulting film may be lowered.

  In the printing mesh method shown in FIG. 2, when the conductive layer is formed by a vapor deposition method (metal vapor deposition film), the formation method is not particularly limited, but sputtering, ion plating, electron beam Vapor deposition methods such as vapor deposition, vacuum deposition, chemical vapor deposition, printing, coating, etc. can be mentioned. Vapor deposition methods (sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition, chemical vapor deposition) Is preferred. A conductive layer can be formed using an inorganic compound constituting the conductive particles. When the conductive layer is formed by a vapor deposition method, the layer thickness is preferably 0.1 to 10 μm, more preferably 2 to 8 μm, and particularly preferably 3 to 6 μm.

  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.

  Moreover, you may give anti-glare performance. When this anti-glare treatment is performed, a blackening treatment may be performed on the surface of the (mesh) conductive layer. For example, oxidation treatment of a metal film, black plating such as chromium alloy, application of black or dark ink, and the like can be performed.

The intermediate layer 13 of the present invention is a layer containing a polyester resin, and is preferably composed of a polyester resin. In particular, the curing agent, Ru polyester resin der free inter alia polyisocyanate. By using such an intermediate layer, long-term stable adhesion between each layer of the transparent film and the mesh-like conductive layer or near-infrared absorbing layer is ensured, and long-term retention of near-infrared shielding is maintained. It is possible. The layer thickness of the intermediate layer is generally 10 to 10000 nm, preferably 10 to 5000 nm, in particular 10 to 2000 nm. However, in the case of a printed mesh, it may be thin, generally 10 to 1000 nm, preferably 10 to 500 nm, especially 10 to 200 nm.

A polyester resin is mainly used as a material for forming the intermediate layer. The polyester resin is generally obtained by polycondensation of glycol and a polyvalent (generally divalent) carboxylic acid. The glycol includes 2,2-dimethyl-1,3-propanediol (neopentyl glycol). Examples of other glycols include ethylene glycol, diethylene glycol, propylene glycol, butanediol, hexanediol, 1,4-cyclohexanedimethanol , 2 -methyl-2-ethyl-1,3-propanediol, and 2-methyl-2. -Butyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2-methyl-2-isopropyl-1,3-propanediol, 2-methyl-2-n-hexyl- 1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-ethyl-2-n-butyl-1,3-propanediol, 2-ethyl-2-n-hexyl-1,3 -Propanediol, 2,2-di-n-butyl-1,3-propanediol, 2-n-butyl-2-propyl-1,3 -Propanediol, 2,2-di-n-hexyl-1,3-propanediol. Ethylene glycol, diethylene glycol, propylene glycol, butanediol, hexanediol, 1,4-cyclohexanedimethanol meth no Le preferred.

Carboxylic acid multivalent (generally bivalent) comprises terephthalic acid, isophthalic acid, adipic acid, azelaic acid, at least one member selected from sebacic acid. Other examples include aromatic dicarboxylic acids such as diphenylcarboxylic acid and 2,6-naltalenedicarboxylic acid; succinic acid, malonic acid, glutaric acid, pimelic acid, suberic acid, fumaric acid and maleic acid. .

  The weight average molecular weight of the polyester resin is generally in the range of 1000 to 50000, particularly preferably in the range of 2000 to 20000. The number average molecular weight is generally in the range of 1000 to 50000, particularly preferably in the range of 2000 to 20000.

  As a resin component other than the polyester resin, an acrylic resin, a polyester resin, a styrene-maleic acid graft polyester resin, an acrylic graft polyester resin, an epoxy resin, a urethane resin, a silicone resin, or the like may be used.

  The intermediate layer forming coating solution can be obtained by mixing and dissolving the polyester resin and various additives in an organic solvent. And an intermediate | middle layer can be obtained by coating and drying the obtained coating liquid by a well-known coating method. Since the coating liquid for forming an intermediate layer of the present invention usually does not contain a curing agent, the intermediate layer can be formed by evaporating the solvent after coating.

  The antireflection layer of the present invention is generally a composite film of a hard coat layer having a refractive index lower than that of a transparent film as a substrate and a low refractive index layer provided thereon, or a hard coat layer and a low refractive index layer. Is a composite film in which a high refractive index layer is further provided therebetween. Alternatively, a composite film of a hard coat layer having a higher refractive index than that of the transparent film as a substrate and a low refractive index layer provided thereon may be used.

  Even if the antireflection layer is only a hard coat layer having a refractive index lower than that of the substrate, it is effective. However, when the refractive index of the substrate is low, a composite film of a hard coat layer having a higher refractive index than the transparent film and a low refractive index layer provided thereon, or a higher refractive index layer is provided on the low refractive index layer. A composite film obtained may be used.

  As a hard-coat layer, an acrylic resin layer, an epoxy resin layer, a urethane resin layer, a silicone resin layer, etc. can be mentioned, The 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.

  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, acetophenone such as 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1 Benzoin series such as benzyl dimethyl ketal, benzophenone, 4-phenylbenzophenone, benzophenone series such as hydroxybenzophenone, thioxanthone series such as isopropylthioxanthone, 2-4-diethylthioxanthone, and other special types include methylphenyl glyoxylate Etc. can be used. Particularly preferably, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, Examples include benzophenone. 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 film. By using the ultraviolet curable resin, a refractive index lower than that of the substrate is generally easily obtained. Therefore, it is preferable to use a material having a high refractive index such as PET as the transparent substrate. The film thickness is as described above.

  For the hard coat layer, among the UV curable resins (monomer, oligomer), pentaerythritol tri (meth) acrylate, pentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, trimethylolpropane Hard polyfunctional monomers such as tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, tris [(meth) acryloxyethyl] isocyanurate, ditrimethylolpropane tetra (meth) acrylate It is preferable to use mainly.

  The hard coat layer can be adjusted in refractive index by using the following materials of a high refractive index layer and a low refractive index layer.

The high refractive index layer is made of ITO, ATO, Sb ₂ O ₅ , Sb ₂ O ₃ , SbO ₂ , In ₂ O ₃ , SnO ₂ , ZnO, ZrO ₂ , Al in a polymer (preferably UV curable resin). A layer in which conductive metal oxide fine particles (inorganic compounds) such as doped ZnO and TiO ₂ are dispersed is preferable. However, if the refractive index is high, non-conductive metal oxide fine particles can also be used. As the metal oxide fine particles, those having an average particle diameter of 10 to 10000 nm, preferably 10 to 100 nm, particularly 10 to 50 nm are preferable. In particular, ZrO ₂ and ITO (especially those having an average particle diameter of 10 to 50 nm) are 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 should be within 1.5% by setting the refractive index of the high refractive index layer 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 low refractive index layer is a layer (cured) in which fine particles such as silica and fluororesin, preferably hollow silica, are dispersed in a polymer (preferably UV curable resin) in an amount of 10 to 60% by weight (preferably 10 to 50% by weight). Layer). The refractive index of this low refractive index layer is preferably 1.40 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.

  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.

  When the antireflection layer 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 200 nm, and the thickness of the low refractive index layer is 75 to 200 nm. Preferably there is.

  In order to form each layer of the antireflection layer including the intermediate layer or the hard coat layer, as described above, the above-mentioned fine particles and the like are blended with a polymer (preferably an ultraviolet curable resin) as necessary, and the obtained coating The working solution is applied and then dried, if necessary, heat-cured, or after coating, if necessary, 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 with ultraviolet rays and curing, effects of improving 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 is preferably formed by coating as described above, but may be formed by a vapor deposition 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 high refractive index layer, the low refractive index layer, and the like 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.

  A near-infrared absorption layer is generally obtained by forming a layer containing a pigment or the like on the surface of a transparent film. The near-infrared absorbing layer can be obtained, for example, by applying a coating liquid containing the above-mentioned pigment and binder resin or ultraviolet curable or electron beam curable resin, and if necessary, drying and curing. When used as a film, it is generally a near-infrared cut film, such as a film containing a pigment or the like. The dye generally has an absorption maximum at a wavelength of 800 to 1200 nm. Examples include phthalocyanine dyes, metal complex dyes, nickel dithiolene complex dyes, cyanine dyes, squarylium dyes, polymethine dyes, Examples thereof include azomethine dyes, azo dyes, polyazo dyes, diimonium dyes, aminium dyes, and anthraquinone dyes, and cyanine dyes and squarylium dyes are particularly preferable. These dyes can be used alone or in combination. Examples of the binder resin include thermoplastic resins such as acrylic resins.

  In the present invention, the near-infrared absorbing layer may be provided with a function of adjusting color tone by providing a function of absorbing neon light emission. For this purpose, a neon-emission absorption layer may be provided, but a neon-emission selective absorption dye may be included in the near-infrared absorption layer.

  Examples of selective absorption dyes for neon emission include cyanine dyes, squarylium dyes, anthraquinone dyes, phthalocyanine dyes, polymethine dyes, polyazo dyes, azurenium dyes, diphenylmethane dyes, and triphenylmethane dyes. it can. Such a selective absorption dye is required to have a selective absorption of neon emission near 585 nm and a small absorption at other visible light wavelengths, so that the absorption maximum wavelength is 575 to 595 nm and the absorption spectrum half width is What is 40 nm or less is preferable.

  Also, when combining multiple types of near-infrared or neon luminescent absorbing dyes, if there is a problem with the solubility of the dye, if there is a reaction between the dyes due to mixing, if there is a decline in heat resistance, moisture resistance, etc. All the near-infrared absorbing dyes need not be contained in the same layer, and may be contained in another layer.

  Further, as long as the optical properties are not greatly affected, coloring pigments, ultraviolet absorbers, antioxidants and the like may be further added.

  As a near-infrared absorption characteristic of the optical filter of the present invention, it is preferable that the transmittance at 850 to 1000 nm is 20% or less, and further 15%. Moreover, as selective absorptivity, it is preferable that the transmittance | permeability of 585 nm is 50% or less. Especially in the former case, there is an effect of reducing the transmittance in a wavelength region where malfunction of a remote controller of a peripheral device is pointed out. In the latter case, an orange color having a peak at 575 to 595 nm is color reproducibility. This has the effect of absorbing the orange wavelength, thereby improving the redness and improving the color reproducibility.

  The layer thickness of the near infrared absorbing layer is generally 0.5 to 50 μm.

  The pressure-sensitive adhesive layer of the present invention is a layer for adhering the optical film of the present invention to a display, and any resin can be used as long as it has an adhesive function. For example, acrylic adhesives, rubber adhesives, SEBS (styrene / ethylene / butylene / styrene) and SBS (styrene / butadiene / styrene) and other thermoplastic elastomers (TPE) as main components TPE-based pressure-sensitive adhesives and adhesives can also be used.

  The layer thickness is generally in the range of 5 to 500 μm, particularly 10 to 100 μm. In general, the optical filter can be equipped by heat-pressing the pressure-sensitive adhesive layer to a glass plate of a display.

  When two transparent films are used in the present invention, for example, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, acrylic resin (eg, ethylene- (meth) acrylic acid copolymer) Polymer, ethylene- (meth) ethyl acrylate copolymer, ethylene- (meth) methyl acrylate copolymer, metal ion crosslinked ethylene- (meth) acrylic acid copolymer), partially saponified ethylene-vinyl acetate copolymer Examples thereof include ethylene copolymers such as a polymer, a carboxylated ethylene-vinyl acetate copolymer, an ethylene- (meth) acryl-maleic anhydride copolymer, and an ethylene-vinyl acetate- (meth) acrylate copolymer. ("(Meth) acryl" means "acryl or methacryl"). In addition, polyvinyl butyral (PVB) resin, epoxy resin, phenol resin, silicone resin, polyester resin, urethane resin, rubber adhesive, thermoplastic elastomers such as SEBS and SBS, etc. can also be used. Acrylic resin adhesives and epoxy resins are easily obtained.

  The layer thickness is generally 10 to 50 μm, preferably 20 to 30 μm. In general, the optical filter can be equipped by heat-pressing the pressure-sensitive adhesive layer to a glass plate of a display.

  When EVA is also used as the material for the pressure-sensitive adhesive layer, the EVA has a vinyl acetate content of 5 to 50% by weight, preferably 15 to 40% by weight. 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 the physical properties of EVA (mechanical strength, optical properties, adhesion, 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 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, which 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.

  For example, after the EVA and the above-mentioned additive are mixed and kneaded with an extruder, a roll or the like, the adhesive layer is formed into a predetermined shape by a film forming method such as a calendar, roll, T-die extrusion, or inflation. Manufactured by.

  A protective layer may be provided on the antireflection layer. The protective layer is preferably formed in the same manner as the hard coat layer.

  As the material of the release sheet provided on the pressure-sensitive adhesive layer, a transparent polymer having a glass transition temperature of 50 ° C. or higher is preferable. Examples of such a material include polyesters such as polyethylene terephthalate, polycyclohexylene terephthalate, and polyethylene naphthalate. In addition to resins, nylon 46, modified nylon 6T, nylon MXD6, polyamide resins such as polyphthalamide, ketone resins such as polyphenylene sulfide and polythioether sulfone, and sulfone resins such as polysulfone and polyether sulfone. Mainly composed of polymers such as ether nitrile, polyarylate, polyetherimide, polyamideimide, polycarbonate, polymethyl methacrylate, triacetyl cellulose, polystyrene, polyvinyl chloride It can be used fat. 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.

  The optical filter of the present invention is provided with, for example, a mesh-like conductive layer, a near-infrared absorbing layer, an adhesive layer, and the like sequentially on one surface of a long transparent film, and then a hard surface on the other surface of the transparent film. It can be manufactured by providing a coat layer, an antireflection layer, and the like. The installation of each layer may be performed continuously or in a batch. What is necessary is just to cut | judge the elongate laminated body obtained in this way, and to provide an electrode part as mentioned above in the end surface. As a coating machine used when applying (applying) each layer to a long transparent film, a slit die, a lip direct, a lip reverse, or the like can be used. When both surfaces are applied simultaneously, a double-sided simultaneous coating machine in which lip dies are arranged on both sides is generally used.

  The display 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.

  Since the PDP display device of the present invention uses a plastic film as a transparent substrate, the optical filter of the present invention can be directly bonded to the surface of the glass plate, and thus a single transparent film is used. In this case, the PDP itself can contribute to weight reduction, thickness reduction, and 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.

Accordingly, the display having the optical filter of the present invention is excellent in antireflection effect and antistatic property, hardly emits dangerous electromagnetic waves, is easy to see, is hardly attached with dust and the like, and has excellent durability.

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]
<Preparation of optical filter for display>
(1) Formation of intermediate layer On a long polyethylene terephthalate film (width: 600 mm, length 100 m) having a thickness of 100 μm, an intermediate layer forming coating solution having the following composition was applied at 100 ° C. for 1 minute. It was dried and cured to form an intermediate layer having a thickness of 80 nm. The refractive index of the obtained intermediate layer was 1.65.

Formula:
Polyester resin (resin composition: neopentyl glycol / phthalic acid, sebacic acid (mass ratio 1: 5);
Resin 40 mass%, toluene 30 mass%, ethyl acetate 30 mass%) 5 mass parts cyclohexanone 95 mass parts

(2) Formation of mesh-like conductive layer A 20% aqueous solution of polyvinyl alcohol was printed in the form of dots on the intermediate layer formed on the long polyethylene terephthalate film. The size of one dot is a square shape with one side of 234 μm, the interval between the dots is 20 μm, and the dot arrangement is a square lattice. The printing thickness is about 5 μm after drying.

  On top of that, copper was vacuum-deposited so as to have an average film thickness of 4 μm. Next, it was immersed in water at room temperature and rubbed with a sponge to dissolve and remove the dot portion, then rinsed with water and dried to form a mesh-like conductive layer on the polyethylene film.

  The conductive layer on the surface of the film had a square lattice shape that accurately corresponded to the negative pattern of dots, the line width was 20 μm, and the aperture ratio was 83.6%. The average thickness of the conductive layer (copper layer) was 4 μm.

(3) Formation of near-infrared absorbing layer (having color tone correction function)
Polymethylmethacrylate 30 parts by mass TP-2 (manufactured by Yamada Chemical Co., Ltd.) 0.4 parts by mass Plast Red 8380 (manufactured by Arimoto Chemical Industry Co., Ltd.) 0.1 parts by mass CIR-1085 (Nippon Carlit Co., Ltd.) 1.3 parts by mass IR-10A (manufactured by Nippon Shokubai Co., Ltd.) 0.6 parts by mass Methyl ethyl ketone 152 parts by mass Methyl isobutyl ketone 18 parts by mass were mixed with the above intermediate layer and conductive layer. It was coated on the top using a bar coater and dried in an oven at 80 ° C. for 5 minutes. Thereby, a near-infrared absorbing layer (having a color tone correcting function) having a thickness of 5 μm was formed on the polyethylene film.

  Thereby, an optical filter for display was obtained.

[Example 2]
An optical filter for display was obtained in the same manner as in Example 1 except that the composition of the intermediate layer was changed to the composition as described below.

Formula:
Polyester resin (resin composition: neopentyl glycol / adipic acid, phthalic acid (mass ratio 1: 1);
Resin 40 mass%, toluene 30 mass%, ethyl acetate 30 mass%) 5 mass parts cyclohexanone 95 mass parts

[Example 3]
(1) The thickness of the intermediate layer was changed to 80 nm, and (2) an optical filter for display was obtained in the same manner as in Example 1 except that the mesh-shaped conductive layer was formed as follows.

(2) Formation of mesh-like conductive layer A copper foil having a thickness of 10 μm was adhered on the intermediate layer formed on the long polyethylene terephthalate film. A pattern of this copper foil was formed by a photolithography method, and the exposed portion of the copper foil was etched to form a copper foil having a lattice pattern (wire diameter 30 μm, pitch 180 μm).

  The conductive layer on the film surface had a line width of 30 μm and an aperture ratio of 69.4%. The average thickness of the conductive layer (copper layer) was 3 μm.

[Example 4]
An optical filter for display was obtained in the same manner as in Example 3 except that the composition of the intermediate layer was changed to the composition as described below.

Formula:
Polyester resin (resin composition: neopentyl glycol / adipic acid, phthalic acid (mass ratio 2: 1);
Resin 40 mass%, toluene 30 mass%, ethyl acetate 30 mass%) 5 mass parts cyclohexanone 95 mass parts

[Comparative Example 1]
An optical filter for display was obtained in the same manner as in Example 3 except that the composition of the intermediate layer was changed to the composition as described below.

Formula:
Bisphenol A type epoxy resin 5 parts by mass Hexane diisocyanate 0.5 parts by mass Cyclohexanone 94.5 parts by mass

[Comparative Example 2]
An optical filter for display was obtained in the same manner as in Example 3 except that the composition of the intermediate layer was changed to the composition as described below.

Formula:
Ethylene vinyl acetate copolymer (vinyl acetate content: 28% by mass 5 parts by mass cyclohexanone 95 parts by mass

[Example 5]
Further, a display optical filter was obtained in the same manner as in Example 3 except that the following layers were provided.

(5) Formation of pressure-sensitive adhesive layer The following formulation:
SK Dyne 1811L (manufactured by Soken Chemical Co., Ltd.) 100 parts by mass Curing agent L-45 (manufactured by Soken Chemical Co., Ltd.) 0.45 parts by mass Toluene 15 parts by mass Ethyl acetate 4 parts by mass Was coated on the near infrared absorbing layer using a bar coater and dried in an oven at 80 ° C. for 5 minutes. Thereby, an adhesive layer having a thickness of 25 μm was formed on the near-infrared absorbing layer.

(6) Formation of hard coat layer The following formulation:
Dipentaerythritol hexaacrylate (DPHA) 20 parts by weight Zirconia (average particle size 50 nm) 80 parts by weight Methyl ethyl ketone 100 parts by weight Toluene 100 parts by weight Irgacure 184 (manufactured by Ciba Specialty Chemicals) Was applied to the back surface of the PET film using a bar coater and cured by ultraviolet irradiation. Thereby, a hard coat layer (refractive index 1.71) having a thickness of 5 μm was formed on the mesh-like conductive layer.

(7) Formation of low refractive index layer The following formulation:
Opstar JN-7212 (manufactured by JSR Corporation) 100 parts by weight Methyl ethyl ketone 117 parts by weight Methyl isobutyl ketone 117 parts by weight

The coating liquid obtained by mixing was applied on the hard coat layer using a bar coater, dried in an oven at 80 ° C. for 5 minutes, and then cured by ultraviolet irradiation. Thereby, a low refractive index layer (refractive index 1.42) having a thickness of 90 nm was formed on the hard coat layer.

  Thereby, an optical filter for display was obtained.

  The obtained optical filter for display was evaluated as follows.

[Evaluation of optical filter]
(1) Pigment deterioration of near-infrared absorbing layer The obtained optical filter was allowed to stand in an atmosphere at a temperature of 60 ° C. and a humidity of 90% for 500 hours, and the transmittance of light at 585 nm and 850 nm was measured using a spectrophotometer. Then, the degree of fading of the pigment in the near-infrared absorbing layer is evaluated as follows.
○: Transmittance is 2% or less, ×: Transmittance exceeds 2%

(2) Adhesiveness of mesh-like conductive layer The obtained optical filter is allowed to stand in an atmosphere at a temperature of 80 ° C. for 500 hours, and then the presence or absence of peeling of the mesh-like conductive layer is visually observed. Evaluation is as follows.
Evaluation: (circle): Peeling is not observed, X: Peeling is seen.

  The results are shown in Table 1.

The PDP filters obtained in Examples 1 to 4 were excellent in dye deterioration and adhesiveness. The PDP filter of Comparative Example 1 using a curing agent has a dye deterioration, and the filter of Comparative Example 2 using conventional EVA is not sufficient in adhesiveness. Further, the filter of Example 3 is further hard-coated. The optical filter of Example 5 provided with a layer or the like exhibited excellent electromagnetic shielding properties and antireflection properties.

It is a schematic sectional drawing which shows an example of the basic composition of the optical filter of this invention. It is the schematic explaining the formation method of the mesh-shaped electroconductive layer by the printing mesh method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Display optical filter 12 Transparent film 13 Intermediate layer 14 Mesh-like electroconductive layer 15 Near-infrared absorption layer 16 Adhesive layer 17 Hard-coat layer 18 Antireflection layer

Claims (12)

An optical filter for display comprising at least one transparent film, a mesh-like conductive layer provided on one transparent film, and a near-infrared absorbing layer provided on the mesh-like conductive layer,
Intermediate layer is provided between the transparent film and the mesh-shaped conductive layer, it viewed including the intermediate layer is a polyester resin, and does not include a polyisocyanate,
The polyester resin of the intermediate layer contains 2,2-dimethyl-1,3-propanediol as a glycol component, and is selected from terephthalic acid, isophthalic acid, adipic acid, azelaic acid and sebacic acid as a polyvalent carboxylic acid An optical filter for display , comprising at least one selected from the above-mentioned . An optical filter for display in which a mesh-like conductive layer and a near-infrared absorbing layer are provided in this order on one surface of a transparent film, and a hard coat layer is provided on the other surface,
Intermediate layer is provided, et al is between the transparent film and the mesh-shaped conductive layer, the intermediate layer is observed containing a polyester resin, does not contain and polyisocyanate,
The polyester resin of the intermediate layer contains 2,2-dimethyl-1,3-propanediol as a glycol component, and is selected from terephthalic acid, isophthalic acid, adipic acid, azelaic acid and sebacic acid as a polyvalent carboxylic acid An optical filter for display , comprising at least one selected from the above-mentioned . The optical filter for display according to claim 2, wherein a low refractive index layer having a lower refractive index than that of the hard coat layer is further formed on the hard coat layer. The optical filter for display according to any one of claims 1 to 3 , wherein the mesh-shaped conductive layer has a thickness of 1 to 200 µm.   The optical filter for display according to any one of claims 1 to 4, wherein the mesh-like conductive layer is made of a mesh-like metal film or a metal vapor-deposited film. The optical filter for display according to any one of claims 1 to 5 , wherein a pressure-sensitive adhesive layer is provided on the surface of the near-infrared absorbing layer opposite to the transparent film. The optical filter for display according to any one of claims 1 to 6 , wherein the near-infrared absorbing layer has adhesiveness. The optical filter for display according to any one of claims 1 to 7 , wherein the transparent film is a plastic film. The optical filter for display according to any one of claims 6 to 8 , wherein a release sheet is provided on the pressure-sensitive adhesive layer or the pressure-sensitive near-infrared absorbing layer. An optical filter for display according to any one of claims 1 to 9, which is a plasma display panel filter. Display optical filter for display according to any one of claims 1 to 9, characterized in that it is bonded to the surface of the image display glass plate. A plasma display panel, wherein the optical filter for display according to any one of claims 1 to 9 is bonded to a surface of an image display glass plate.

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