JP2001159711A - Adhesive filter for plasma display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter which makes the red of a plasma display vivid. SOLUTION: The adhesive filter is directly or indirectly stuck to the front face of a plasma display and comprises a transparent resin sheet having its maximum absorption at 560-600 nm wavelength of light, an antireflection layer disposed on one face of the transparent resin sheet by way of an adhesive layer and an adhesive layer disposed on the other face of the sheet and used for the sticking. Both the adhesive layers have a UV absorbing effect in such a way that <=20% transmittance to light of <=380 nm wavelength is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an adhesive filter for a plasma display. Specifically, it is provided on the front of the plasma display, the color of the plasma display,
In particular, it relates to a filter for sharpening red.

[0002]

2. Description of the Related Art In recent years, plasma display panels have been used as display panels for various types of electronic devices such as large wall-mounted televisions, and their demand has been increasing, and it is expected that the number will increase further in the future. In a plasma display, a mixed gas of xenon and neon is excited by discharge to emit vacuum ultraviolet rays, and red and
Light emission of three primary colors is obtained by using light emission of each of blue and green phosphors. At that time, when the neon atom is excited and returns to the ground state, it emits a so-called neon orange light centered at around 600 nm (Journal of the Institute of Image Information and Television Engineers V
ol. 51 NO. 4P. 459-463 (199
7)). For this reason, the plasma display has a drawback in that orange is mixed with red and a bright red cannot be obtained.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a filter for a plasma display panel which can effectively cut off neon emission, and which can be easily attached to the surface of a plasma display or the like. In particular, the present invention provides a filter for a plasma display panel having excellent durability.

[0004]

As a result of various studies, the present inventors have found that a dye having a maximum absorption at a light wavelength of 560 to 600 nm is used, and this is used as a filter. Found that it absorbs neon orange light well and makes the red of the plasma display look vivid red, and that by forming layers on both sides of this sheet to prevent the deterioration of the dye, it also has excellent light resistance. Thus, the present invention has been completed.

That is, the gist of the present invention is to provide a pressure-sensitive adhesive filter directly or indirectly attached to the front surface of a plasma display, wherein the transparent resin sheet has a maximum absorption at a light wavelength of 560 to 600 nm, and the transparent resin sheet. A light reflection preventing layer provided on one side of the adhesive layer via an adhesive layer,
And a pressure-sensitive adhesive layer provided on the other surface of the transparent resin sheet for bonding the surfaces to be bonded.
An adhesive filter for a plasma display characterized by having an ultraviolet absorbing effect so that the following light transmittance is 50% or less. Further, the following general formula (1) wherein the transparent resin sheet has a maximum absorption at a wavelength of light of 560 to 600 nm.

[0006]

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[In the formula (1), R represents a halogen atom, an alkyl group which may have a substituent, an alkoxy group which may have a substituent, or an alkenyl group which may have a substituent. And m represents an integer of 1 to 3 and n represents an integer of 0 to 4. The present invention is also applicable to the pressure-sensitive adhesive filter for a plasma display described above, wherein the squarylium-based compound represented by the formula (1) is contained as a coating layer or contained in a sheet.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The adhesive filter for plasma display of the present invention,
It is used directly on the front surface of the plasma display or attached to another filter surface provided on the front surface of the plasma display.

The adhesive filter for a plasma display of the present invention is basically composed of a transparent synthetic resin filter containing a dye having a maximum absorption at a light wavelength of 560 to 600 nm, an adhesive layer, and a light reflection preventing layer. Become. A dye having a maximum absorption at a wavelength of 560 to 600 nm is 56
Any squarylium compound having a maximum absorption at 0 to 600 nm and being well mixed with the synthetic resin may be used, but usually, the squarylium compound represented by the general formula (I) is suitably used. In the general formula (I), preferred examples of the substituent R include the following (i) to (vii).

(I) a halogen atom such as a fluorine atom, a chlorine atom and a bromine atom; (ii) a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a decyl group and an undecyl A straight-chain or branched-chain alkyl group having 1 to 20 carbon atoms such as a group, dodecyl group, tridecyl group or pentadecyl group; (iii) alkoxycarbonyl such as a hydroxy group, a methoxycarbonyl group, an ethoxycarbonyl group or a butoxycarbonyl group as a substituent; A carbon atom having an alkoxycarbonyloxy group such as an acyloxycarbonyl group such as a acetyloxycarbonyl group, a propionyloxycarbonyl group, or the like, a methoxycarbonyloxy group, an ethoxycarbonyloxy group, or a butoxycarbonyloxy group;
-20 linear or branched alkyl groups;

(Iv) methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, heptyloxy, octyloxy, decyloxy, undecyloxy, dodecyloxy, tridecyloxy 1-2 carbon atoms such as pentadecyloxy group
A straight-chain or branched-chain alkoxy group of 0; (v) 1 carbon atom such as a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentyloxy group, a hexyloxy group, a heptyloxy group, an octyloxy group;
A linear or branched alkoxy group having 1 to 20 carbon atoms having an alkoxy group of 8 to 8;

(Vi) an alkenyl group such as an ethenyl group; (vii) a methyl group, an ethyl group, a propyl group,
Alkyl group such as butyl group, pentyl group, hexyl group, heptyl group, octyl group, decyl group, phenyl group, 4-hydroxyphenyl group, 4-alkoxy (for example, alkoxy group having 1 to 10 carbon atoms) phenyl group, 3 , 4-bisalkoxy (for example, an alkoxy group having 1 to 10 carbon atoms) phenyl group, 3,5-bisalkoxy (for example, having 1 carbon atom
An alkenyl group such as an ethenyl group substituted with a phenyl group or a 3,4,5-trisalkoxy (for example, an alkoxy group having 1 to 10 carbon atoms) phenyl group; Among these, a linear or branched alkyl group having 1 to 6 carbon atoms; a linear or branched alkyl group having 1 to 6 carbon atoms substituted by a hydroxyl group or an alkoxycarbonyl group; an alkoxy group having 1 to 6 carbon atoms Or an ethenyl group having a substituent is particularly preferred.

The squarylium compounds of the general formula (I) are described, for example, in Angew. Chem. 77 680-6
81 (1965) or according to them. That is, the following general formula (II)

[0014]

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[Wherein, R, m, and n have the same meaning as described above. With respect to 2 moles of the phenolic compound represented by
It can be synthesized by dehydrating and condensing 1 mole of squaric acid in ethanol, acetic acid, a mixed solvent of n-butyl alcohol-toluene, a mixed solvent of n-butyl alcohol-benzene and the like while heating at about 70 to 150 ° C. . Representative examples of the general formula (I) are shown below.

[0016]

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The layer containing the squarylium compound represented by the general formula (I) of the filter of the present invention contains the squarylium compound of the general formula (I) in a transparent resin sheet formed into a film or a sheet. It is easily manufactured by applying a coating liquid. The coating liquid is prepared by dissolving a squarylium-based compound of the general formula (I) in an organic solvent together with a binder, or by using a squarylium-based compound atomized to a particle size of 0.1 to 3 μm using a dispersant as necessary, Together with a solvent. At this time, the content of the squarylium-based compound, binder, dispersant and the like dissolved or dispersed in the solvent in the coating liquid is 0.5 to 50% by weight. Is 0.05 to 50% by weight, preferably 0.1 to 20% by weight.

[0018] The dispersant optionally used includes:
Examples thereof include polyvinyl butyral resin, phenoxy resin, rosin-modified phenol resin, petroleum resin, cured rosin, rosin ester, maleated rosin, and polyurethane resin. The amount used is 0.5 to 150 times by weight, preferably 10 to 100 times by weight, based on the squarylium-based compound.

As the binder to be used, acrylate resins such as polymethyl methacrylate resin and polyethyl acrylate resin, polycarbonate resin, ethylene-vinyl alcohol copolymer resin, ethylene-vinyl acetate copolymer resin, AS resin, polyester resin, Examples thereof include polyvinyl chloride resin, polyvinyl butyral resin, PVPA, polystyrene resin, phenol resin, phenoxy resin, polysulfone, nylon, cellulose resin, and cellulose acetate resin. The amount used is 10 to 500 times by weight, preferably 50 to 350 times by weight, based on the squarylium-based compound.

Since the wavelength at the minimum value of the transmittance curve of the layer containing the squarylium-based compound of the present invention varies depending on the binder used, the squarylium-based compound must be effectively cut off at around 600 nm. It is preferable to select a binder resin according to the type of the compound. At that time, neon emission around 600 nm is efficiently cut, and the emission color of the phosphor is 500 to 530 nm.
It is preferable to select a combination of a squarylium-based compound and a binder resin so as not to cut near green light emission and red light emission having a wavelength longer than 600 nm. For this purpose, it is better that the transmittance curve of the squarylium-based compound has a sharp valley shape (valley shape), and the wavelength at the minimum value of the transmittance curve of the squarylium-based compound is 5%.
60 nm to 600 nm is preferable, and 580 to 600 nm
Is more preferred. The minimum value of the transmittance curve is preferably 7 since the purpose is to suppress neon light emission.
0% or less, more preferably 55% or less. In addition to the minimum value of the transmittance curve around 600 m, the squarylium-based compound has a minimum value of the transmittance curve in order to secure the brightness of the visual field. It is preferable not to do so, but even if it has, it is at least 75%, more preferably at least 80%, and the luminous transmittance is preferably at least 55%, more preferably at least 70%. The luminous transmittance refers to a value according to JIS-Z8105. The light resistance of the squarylium-based compound of the present invention varies depending on the binder resin. Of the binder resin,
When a polyester resin is used, the light resistance of the squarylium-based compound is better.

The coating of a coating solution containing a squarylium-based compound can be performed by known coating methods such as dipping, flow coating, spraying, bar coating, gravure coating, roll coating, blade coating, and air knife coating. Coated by construction method. At this time, the film thickness after drying is 0.1 to 30 μm, preferably 0.5 to 10 μm.
m.

The material of the transparent resin sheet constituting the filter for a plasma display of the present invention is not particularly limited as long as it is substantially transparent and does not have large absorption and scattering. Specific examples include polyolefin resin, amorphous polyolefin resin, polyester resin,
Examples thereof include polycarbonate resin, poly (meth) acrylate resin, polystyrene, polyvinyl chloride, polyvinyl acetate, polyarylate resin, and polyether sulfone resin.

Of these, amorphous polyolefin resin, polyester resin, polycarbonate resin, poly (meth) acrylate resin, polyarylate resin, polyether sulfone resin and the like are particularly preferable. The above-mentioned resins include generally known additives such as phenol-based, phosphorus-based antioxidants, halogen-based, phosphoric acid-based flame retardants, heat-resistant anti-aging agents, ultraviolet absorbers, lubricants, and antistatic agents. Agents and the like can be blended.

The resin is formed into a sheet (including a film) by a known method such as injection molding, T-die molding, calender molding, compression molding, or a method of melting and casting in an organic solvent. . The thickness is preferably in the range of 10 μm to 5 mm depending on the purpose.
The base material constituting such a transparent sheet may be unstretched or stretched. Further, it may be laminated with another base material.

Further, the transparent sheet is subjected to a corona discharge treatment,
A surface treatment by a conventionally known method such as a flame treatment, a plasma treatment, a glow discharge treatment, a surface roughening treatment, a chemical treatment or the like, or a coating such as an anchor coating agent or a primer may be applied. The pressure-sensitive adhesive filter for a plasma display panel according to the present invention is obtained by directly dissolving or dispersing the squarylium-based compound represented by the general formula (I) in various resins or other resins constituting the transparent sheet, and obtaining the squarylium-based compound. The resin containing the compound can be molded and formed into a sheet by using a molding technique such as injection molding, T-die molding, calender molding or compression molding, and then bonded to another transparent sheet if necessary.

Further, in place of the coating method of the coating liquid, a squarylium-based compound represented by the general formula (I) is applied to a resin sheet or film constituting a transparent sheet, or another resin sheet (plate) or film. And, if necessary, laminating with another transparent sheet. In the present invention, an ultraviolet absorbing layer is provided on both sides of the transparent resin sheet containing the above-mentioned dye.

The ultraviolet absorbing layer has a wavelength of 380 n on the adhesive layer.
It can be easily formed by adding an ultraviolet absorber so that the light transmittance of m or less is 50% or less.
Examples of the adhesive constituting the adhesive layer include styrene butadiene rubber, polyisobutylene, natural rubber, neoprene,
Rubbers such as butyl rubber and low-polymerized polymers such as poly (methyl acrylate), poly (ethyl acrylate), and poly (alkyl acrylate) such as poly (butyl acrylate) alone or as a tackifier, piccolite, polypail, rosin ester, etc. And the like added.

At the time of attaching the filter to the plasma display, if air bubbles enter between the surface of the plasma display and the filter, the image becomes distorted or becomes difficult to see. Care must be taken. Further, since the surface of the plasma display itself becomes high in temperature, an adhesive which generates gas by heating should be avoided.

When generation of gas is considered, it is preferable to consider addition of an absorbent or the like. For this reason, 3m
30 μm polyester film on 30 m glass plate
180 ° peel strength according to JIS-K6854 after bonding with a μm adhesive and holding at 80 ° C. for 10 days is 7
50 g / 25 mm or more, preferably 1000 g / 25 m
It is desirable to use an adhesive of m or more.

Specifically, a polymer-based adhesive such as polyacrylic acid alkyl ester or a rubber-based adhesive such as styrene-butadiene rubber or natural rubber is used as a halogen-based, alcohol-based, ketone-based, ester-based, or ether-based adhesive. , An aliphatic hydrocarbon, an organic solvent such as an aromatic hydrocarbon alone or dispersed or dissolved in a solvent system in which a plurality of solvents are mixed to adjust the viscosity, dipping method, flow coating method, spray method, bar coating method, Coating is performed by a coating method such as a gravure coating method, a roll coating method, a blade coating method, and an air knife coating method, and then the solvent is dried to form an adhesive layer.

The thickness of the pressure-sensitive adhesive layer at this time is usually 5 to 1
It is 00 μm, preferably 10 to 50 μm. A release film may be provided on the surface of the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer may be protected until it is attached to the surface of the plasma display so that dust and the like do not adhere to the pressure-sensitive adhesive layer. In this case, between the pressure-sensitive adhesive layer at the edge of the filter and the release film, a portion without a pressure-sensitive adhesive layer is formed, or a non-adhesive portion is formed by sandwiching a non-adhesive film, and peeling is started. If it is a part, the work at the time of sticking is easy to do.

As the ultraviolet absorber added to the pressure-sensitive adhesive layer, an organic ultraviolet absorber and an inorganic ultraviolet absorber can be used. Organic UV absorbers include 2- (2'-hydroxy-5'-t-butylphenyl) benzotriazole and 2- (2'-hydroxy-3 ', 5'-di-t-butylphenyl) benzotriazole Benzotriazole compounds such as benzotriazole compounds, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, etc., phenyl salicylate, 4-t-butylphenyl salicylate, 2,
5-tert-butyl-4-hydroxybenzoic acid n-hexadecyl ester, 2,4-di-tert-butylphenyl-
Examples thereof include hydroxybenzoate compounds such as 3 ', 5'-di-t-butyl-4'-hydroxybenzoate. Examples of the inorganic ultraviolet absorber include titanium oxide, zinc oxide, cerium oxide, iron oxide, and barium sulfate. As the ultraviolet absorber, an inorganic ultraviolet absorber having good light resistance is preferable.
The wavelength in transmittance is preferably 350 to 420 nm, more preferably 360 to 400 nm, and 350 nm
If the wavelength is lower, the ultraviolet blocking ability is weak, and if the wavelength is higher than 420 nm, the coloring becomes strong, which is not preferable.

By providing the pressure-sensitive adhesive layer having the ultraviolet absorbing effect, the deterioration of the dye due to the ultraviolet rays from the plasma display or the ultraviolet rays from the outside is prevented, and the durability as a filter is improved. One of the adhesive layers is provided with a light reflection preventing layer. The anti-reflection layer is a metal oxide, a fluoride, a silicide, a boride, a carbide, a nitride, in order to suppress reflection on the surface and improve the transmittance of the filter.
Inorganic substances such as sulfide, vacuum deposition method, sputtering method,
Examples include a method of laminating a film in a single layer or a multilayer by an ion plating method, an ion beam assist method, or the like, and a method of laminating a resin having a different refractive index such as an acrylic resin or a fluorine resin in a single layer or a multilayer. An anti-reflection layer is formed by sticking a film subjected to an anti-reflection treatment on the pressure-sensitive adhesive layer.

The antireflection layer has a haze value according to JIS K6714 of 1 to 10%, preferably about 2 to 8%. As the resin sheet serving as the base of the antireflection layer, the resin exemplified as the sheet containing the dye described above is appropriately used. In addition, an anti-glare layer (non-glare layer) can be provided. For the non-glare layer, for the purpose of widening the viewing angle of the filter, a method of coating fine powder of silica, melamine, acrylic or the like on the surface and coating the surface to scatter transmitted light can be used.

The surface of the transparent resin sheet opposite to the side on which the anti-reflection layer is provided becomes an adhesive layer, and this adhesive layer directly covers the surface of the plasma display or the surface provided on the front surface of the plasma display. (Indirectly for plasma displays). The filter of the present invention may further be provided with a layer having another function such as a near infrared absorbing layer.

The near-infrared absorbing (cutting) layer has a near-infrared transmittance of 2 to 800 nm to 1000 nm, for example.
It is desirably 0% or less, preferably 10% or less. This near-infrared cut layer is formed by mixing a near-infrared absorbing agent into the transparent resin (directly compounding the above-mentioned transparent resin sheet or forming as another layer), or dispersing in an organic solvent,
Alternatively, a coating solution dissolved and added with a binder resin,
Alternatively, it can be formed by applying a coating liquid obtained by adding a near-infrared absorbing agent to a hard coat agent, an anchor coat agent, an adhesive or the like, directly or via another layer to a transparent resin substrate.

Phthalocyanine,
Naphthalocyanine, immonium-based compounds, diimonium-based compounds or aminium salt-based compounds are preferably used. Examples of preferably used immonium-based compounds and diimonium-based compounds include, for example, the following formulas (1) to (1).
The compound represented by (4) is mentioned.

[0038]

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[0039]

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[0040]

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[0041]

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The above-mentioned aminium salt compound includes, for example, a compound represented by the following formula (5). Specific examples of X in the formula include antimonate hexafluoride, perchlorate, boron fluoride, arsenate hexafluoride, periodate, trifluoroacetate, and chloride. .

[0043]

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In the present invention, as a near-infrared absorbing agent,
Imonium-based compounds, diimonium-based compounds or aminium salt-based compounds are preferably used, but other near-infrared absorbing agents may be used or used in combination. As other near-infrared absorbing agents, nitroso compounds and metal complexes thereof, which are organic substances, cyanine compounds, squalilium compounds, thiol nickel complex compounds, aminothiol nickel complex salt compounds, phthalocyanine compounds, naphthalocyanine compounds, Triarylmethane compounds, naphthoquinone compounds, anthraquinone compounds, or amino compounds, or inorganic carbon black,
Antimony oxide, tin oxide doped with indium oxide, oxides, carbides, or borides of metals belonging to Group 4, 5, or 6 of the periodic table can be given.

In this case, the wavelength range is 800 to 1100 nm.
These compounds can be used in an appropriate combination so that the near-infrared transmittance of the above is 15% or less. In particular, a combination of a diimonium-based compound and a phthalocyanine-based compound or a combination of a diimonium-based compound and an aminothiol-nickel complex-based compound is preferable in terms of transparency and near-infrared absorption performance.

Examples of the phthalocyanine compound include compounds having a skeleton represented by the following general formula (6). In the formula, R _{1 to} R ₁₆ are the same or different atoms or the same or different functional groups, and specifically, a hydrogen atom, a fluorine atom, an alkoxy group, a phenoxy group, a thioalkyl group, a thiophenyl group, an aminoalkyl Or an aminophenyl group. Preferably, it is a fluorine atom or an aminophenyl group. In the formula, M is copper, zinc, cobalt, nickel, iron,
At least one selected from vanadyl, titanyl, chloroindium, chloroaluminum, dichlorotin, cobalt carbonyl, and iron carbonyl is exemplified.

[0047]

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Examples of the aminothiol nickel complex compound include a compound having a skeleton represented by the following general formula (7). R _{1 to} R ₈ in the formula are the same or different atoms or the same or different functional groups, and specifically, a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, an alkoxy group, a nitro group, a halogen atom , An amino group, a substituted amino group or a cyano group. Preferably, it is a hydrogen atom or an amino group.

[0049]

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The transparent resin used for forming the near-infrared cut layer by blending the near-infrared absorbing agent with the transparent resin is a resin which is substantially transparent and does not greatly absorb and scatter. Although there is no particular limitation, specific examples include the above-mentioned polycarbonate-based resin, poly (meth) acrylate-based resin, cyclic olefin-based resin, polyester resin, polystyrene, polyvinyl chloride, polyvinyl acetate, and the like. Can be.

Known additives such as antioxidants such as phenolic and phosphorous, halogenating agents, flame retardants such as phosphoric acid, heat-resistant anti-aging agents, ultraviolet absorbers, lubricants, and electrifications An inhibitor and the like can be blended. The transparent resin is blended with the above-mentioned near-infrared absorber, and injection molding, T-die molding, calendar molding, compression molding, or the like, or a method of dissolving in an organic solvent and casting the film, or the like, is used. It is formed into a sheet to form a near-infrared cut layer.

The thickness is preferably from 10 μm to 1 mm. The amount of the near-infrared absorbing agent is usually 0.005 to 8 parts by weight, preferably 0.01 to 5 parts by weight, based on 100 parts by weight of the resin. If the amount of the near infrared absorber is too small, the transmittance of visible light is improved,
Near-infrared absorptivity decreases.

On the other hand, if the compounding amount is too large, the near-infrared absorbing power becomes good, but the visible light transmittance decreases. The near-infrared cut layer is dispersed in or dissolved in an organic solvent, or a coating solution containing a binder resin added thereto or a near-infrared absorbing agent hard coating agent, an anchor coating agent, a coating solution added with an adhesive, It can also be formed by coating on any of the transparent resin substrate, the electromagnetic wave shielding layer, the anti-scratch layer, and the anti-reflection layer according to the lamination order.

Examples of the organic solvent include halogen-based, alcohol-based, ketone-based, ester-based, and aliphatic hydrocarbon-based solvents.
An aromatic hydrocarbon-based solvent, an ether-based solvent, or a mixed solvent thereof is used. As the binder, an ester resin, an acrylic resin, a melamine resin, a urethane resin, a polycarbonate resin, a polyolefin resin,
A polyvinyl resin or the like can be used.

As the hard coat agent, those containing acrylates such as polyurethane acrylate and epoxy acrylate or polyfunctional acrylates, a photopolymerization initiator and an organic solvent as main components can be used.
The above-mentioned near-infrared absorbing agent is usually used in an amount of 1 to 40 parts by weight, preferably 2 to 1 part by weight, based on 100 parts by weight of the hard coat agent.
5 parts by weight are added, and this is applied by a coating method such as a dipping method, a flow coating method, a spray method, a bar coating method, a gravure coating method, a roll coating method, a blade coating method, and an air knife coating method.

Thereafter, the solvent was dried, and a xenon lamp was used.
The coating liquid is cured by irradiating active energy rays using a low-pressure mercury lamp, a high-pressure mercury lamp, or the like to form a near-infrared cut layer. The thickness of the near-infrared cut layer at this time is usually
It is 0.5 to 50 μm, preferably 1 to 20 μm. As the anchor coating agent, isocyanate-based, polyurethane-based, polyester-based, polyethyleneimine-based,
Known anchor coating agents such as polybutadiene type and alkyl titanate type can be used.

Preferred are isocyanate compounds, polyurethanes, urethane prepolymers, or mixtures and reaction products thereof, and mixtures of polyester polyols or polyether polyols with isocyanates. For 100 parts by weight of these anchor coating agents,
Usually, 1 to 50 parts by weight of the above-mentioned near-infrared absorbing agent is added, and this is added by dipping, flow coating, spraying, bar coating, gravure coating, roll coating, blade coating, air knife coating, or the like. It is also possible to apply a coating method and then dry the solvent to form a near infrared cut layer.

[0058]

The embodiments of the present invention will be described below with reference to examples. Example 1 1) Polyethylene terephthalate film (Mitsubishi Chemical polyester film PET film "T600")
E ", a thickness of 100 μm), and in the general formula (I), n = 0,
7.5 g of a 0.08% DME (dimethoxyethane) solution of a squarylium compound having m = 3 (substitution positions 2, 4, and 6) and 40% of a polyethylene terephthalate resin (Vylon 200; manufactured by Toyobo Co., Ltd.) DME solution 2.5
g, mixed with a bar coater, dried, and
A μm coating film was obtained. Soken Chemical Co., Ltd. acrylic resin-based adhesive (trade name "SK Dyne FP-7", resin content = 15% by weight, solvent = ethyl acetate, methyl ethyl ketone, etc.) 1000 parts by weight, the company's curing agent 1 (product) The UV absorber Tinuvin 3 was added to an adhesive solution prepared by mixing and adjusting 2 parts by weight of the name “L-45”) and 0.5 parts by weight of a curing agent 2 (trade name “E-5XM”) manufactured by the company so as not to entrap air.
26 (manufactured by Ciba Geigy) was added in an amount of 5 parts by weight. After the adjustment, a release film made of a 38 μm polyester film was stuck on one side while applying and drying with a doctor roll on both sides of the sheet.
A μm anti-reflection film with glare prevention was attached.
At this time, the thickness of the pressure-sensitive adhesive layer was 25 μm. The wavelength at a 50% transmittance of this ultraviolet absorbing layer was 383 nm.

2) The transmittance of this coating film was measured with a Hitachi spectrophotometer (U-3500) manufactured by Hitachi, Ltd., and the wavelength at the minimum value of the transmittance was 576 n.
m and the transmittance was 8.2%. There was no minimum value of the transmittance curve other than 576 nm. In addition, there was no minimum value of the transmittance other than the minimum value of 576 nm, and a neon emission cut filter having a good transmittance was obtained. The neon light emission cut film had a luminous transmittance of 57%, and was a bright filter (sheet) having a high transmittance. The obtained adhesive filter was affixed to a transparent glass having a thickness of 3 mm. When placed on the front of the plasma display and observed, a clear red color was seen.

Example 2 (Formation example of near-infrared cut layer) A diimmonium-based near-infrared absorbing dye (N, N) was formed on the polyethylene terephthalate resin surface opposite to the squarylium compound coating film surface prepared in the same manner as in Example 1. ,
0.63% cyclohexanone solution of N ', N'-tetrakis (p-dibutylaminophenyl) -p-phenylenedimonium hexafluoroantimonate 0.36
g, polyethylene terephthalate resin (Vylon 20)
0; 20% cyclohexanone solution 3 from Toyobo Co., Ltd.)
g, mixed with a bar coater and dried to a film thickness of 6
A coating film in μm was obtained.

Thereafter, a pressure-sensitive adhesive layer and an antireflection film with anti-glare were attached in the same manner as in Example 1 to obtain a filter. The transmittance was measured with a Hitachi spectrophotometer (U-3500). The wavelength at the minimum value of the transmittance was 1100 nm.

Comparative Example 1 A filter was prepared in the same manner as in Example 2 except that a resin film made of polyethylene terephthalate without a squarylium-based compound coating film was used. When the obtained filter was placed on the front of the plasma display and observed, red was seen to be orangeish.

[0063]

The filter of the present invention is used by being directly or indirectly attached to the surface of a plasma display, absorbs neon orange light well, and sharpens red of the display. In addition, since the adhesive layer has an ultraviolet absorbing ability, it has excellent light resistance.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 9/12 G02B 1/10 A F term (Reference) 2H048 CA01 CA04 CA09 CA12 CA13 CA14 CA19 CA25 CA27 2K009 AA03 AA04 BB11 CC01 CC03 CC06 CC24 CC26 DD03 DD04 DD07 5C060 AA00 BA02 BA07 HC16 5G435 AA00 AA04 AA14 BB06 GG11 GG16 HH02 HH03 KK07

Claims (2)

[Claims] 1. An adhesive filter which is used by being directly or indirectly attached to a front surface of a plasma display,
A transparent resin sheet having a maximum absorption at a wavelength of 560 to 600 nm, a light reflection preventing layer provided on one side of the transparent resin sheet via an adhesive layer, and an adherend provided on the other side of the transparent resin sheet It consists of a pressure-sensitive adhesive layer for surface bonding,
Both the adhesive layers have a transmittance of light having a wavelength of 380 nm or less of 50.
%. An adhesive filter for a plasma display, wherein the adhesive filter has an ultraviolet absorbing effect so as to be less than 0.1%. 2. The transparent resin sheet has a light wavelength of 560 to 60.
The following general formula (1) having a maximum absorption at 0 nm: [In the formula (1), R represents a halogen atom, an alkyl group which may have a substituent, an alkoxy group which may have a substituent, or an alkenyl group which may have a substituent, m represents an integer of 1 to 3 and n represents an integer of 0 to 4. 2. The pressure-sensitive adhesive filter for a plasma display according to claim 1, wherein the squarylium-based compound represented by the formula (1) is contained as a coating layer or contained in a sheet.