KR20070017044A - Manufacturing method of composite filter for display - Google Patents

Abstract

Disclosure of Invention An object of the present invention is to provide a method for producing a composite filter for display including a process of laminating an electromagnetic wave shielding sheet and an optical filter, and to provide a method for producing a composite filter having less air bubbles, a good yield in a short process, and a low cost. .

(A) An electromagnetic wave shielding sheet formed by stacking at least a conductor layer having a mesh-shaped region capable of covering all of the image display regions of a display applied to one side of the transparent substrate, wherein the height of the line portion of the mesh-shaped region is 3 μm or less. A step of preparing an electromagnetic wave shielding sheet having an opening width of an opening of the mesh-shaped region of 150 µm or more and without covering of the planarization layer in the opening of the mesh-shaped region;

(B) The electromagnetic wave shielding is performed on the adhesive layer side of the adhesive optical filter which is formed by laminating an adhesive layer on one side, the adhesive layer having fluidity at the time of adhesion and lamination, and having a peeling resistance of 5 to 30 N / 25 mm. It is a manufacturing method of the composite filter for displays which consists of a laminated body of the electromagnetic wave shielding sheet and optical filter which have a process of laminating | stacking toward the conductor layer side of a sheet | seat.

Electromagnetic shielding sheet, conductor layer, blackening layer, rustproof layer, optical filter

Description

Manufacturing method of composite filter for display {METHOD FOR PRODUCING COMPOSITE FILTER FOR DISPLAY}

1 is a cross-sectional view of an example of an electromagnetic shielding sheet used in the present invention.

2 is a perspective view of an example of an electromagnetic shielding sheet used in the present invention.

3 is a view showing an example of an electromagnetic shielding sheet used in the present invention.

4 is a view showing another example of the electromagnetic shielding sheet used in the present invention.

5 shows an example of an optical filter used in the present invention.

6 is a schematic diagram of obtaining a composite filter for display by bonding and laminating an electromagnetic wave shielding sheet and an adhesive optical filter used in the present invention.

7 is a process chart showing an example of a lamination process of an electromagnetic wave shielding sheet and an adhesive optical filter in the method of manufacturing a composite filter for display of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: electromagnetic shielding sheet

11: transparent base material

12: conductor layer

13: conductive treatment layer

14 metal plating layer

15: blackening layer

16: antirust layer

20: adhesive optical filter

21: optical filter

22: adhesive layer

23: transparent substrate

24: function expression layer

31: first paper feed unit

32: second paper feed unit

34: release film winding roll

35: first laminate unit

36: second laminate unit

37: winding roll

101: mesh shape area

103: opening

104: line part

[Document 1] Japanese Patent Publication No. 3388682

[Document 2] Japanese Unexamined Patent Publication No. 2004-241761

The present invention relates to a method for manufacturing a composite filter comprising an electromagnetic shielding sheet for shielding (shielding) electromagnetic waves generated from a display such as a CRT, a PDP, and an optical filter. It is a manufacturing method of the composite filter for displays which includes the process of laminating an optical filter, and it is related with the manufacturing method of the composite filter which can obtain the composite filter which has little bubble mixing and excellent transparency in a short process.

In recent years, electromagnetic interference (Electro Magnetic Interference; EMI) has increased with the advancement of functions and the increased use of electric and electronic devices, and electromagnetic waves are also used in displays such as cathode ray tubes (CRTs) and plasma display panels (PDPs). Occurs. The plasma display panel is a combination of a data electrode, a glass having a fluorescent layer, and a glass having a transparent electrode, and when operated, generates a large amount of electromagnetic waves, near infrared rays, and heat.

Usually, an electromagnetic wave shielding sheet is provided as a front faceplate in the front surface of a plasma display panel in order to shield an electromagnetic wave. The shielding of electromagnetic waves generated from the front face of the display requires a function of 30 Hz or more at 30 MHz to 1 Hz. In addition, in order to make the display image of a display easier to see visually, the metal mesh (line part) part for electromagnetic wave shielding is hard to be seen, and the mesh pattern precision is good, there is no disorder of the mesh, and it has appropriate transparency (visible light transmittance). It is necessary.

In addition, near-infrared rays having a wavelength of 800 to 1,100 nm generated from the front face of the display also malfunction because other devices such as VTRs need to be shielded. Moreover, the function which shields unnecessary light of the specific wavelength which arises from an image display apparatus, or gives various functions required for an image display apparatus may be calculated | required.

In order to realize the above functions in as few layers as possible, the electromagnetic shielding sheet and an optical filter layer including a near infrared absorbing layer and the like are laminated to shield unnecessary electromagnetic waves and light of a specific wavelength generated from an image display device. Moreover, the use of the composite filter which can give the various function required for an image display apparatus as a front plate of a display panel is examined.

Conventionally, as a manufacturing method of the electromagnetic wave shielding sheet which has a mesh-shaped metal layer, after bonding a metal foil to a transparent plastic base material via an adhesive layer, a geometric figure is formed by a chemical etching process (port lithography process). The method of making is known (for example, patent document 1). According to this method, however, the pattern accuracy of the mesh is good, but warp is likely to occur because different materials are laminated. In addition, since the roughness of the metal foil is transferred to the surface of the adhesive of the mesh opening and remains uneven, there is a drawback that light is diffusely reflected at the roughness and the transparency of the mesh opening is deteriorated. Further, in the step of laminating the electromagnetic wave shielding sheet and the optical filter, the opening of the electromagnetic wave shielding sheet is concave. Therefore, when the optical filter is directly laminated using an adhesive, bubbles are mixed into the mesh openings to light the bubbles. There is a possibility that the transparency of the composite filter may deteriorate due to scattering. As long as the method of adhering the metal foil is selected, in order to maintain the strength that the metal foil does not break in the bonding step, it is necessary to secure the film thickness of the metal foil to 10 µm or more. That means that the depth (step) of the mesh opening is 10 µm or more. Therefore, conventionally, in order to lower the roughness of the adhesive surface of the mesh opening and / or prevent the mixing of bubbles and make it transparent, the mesh opening is previously filled with a transparent resin called a flattening resin as a transparent process to provide a flattening layer. Addition of process was necessary. In addition to the need for an extra material, such a transparent process is required to be omitted since the process also increases.

[Patent Document 1] Japanese Patent No. 3388682

[Patent Document 2] Japanese Patent Application Laid-Open No. 2004-241761

In order to solve such a problem, for example, Patent Literature 2 provides a conductive substrate on one surface of a transparent substrate, and prepares a transparent substrate on which a metal layer is formed as a metal plating layer by electroplating, and There is proposed an electromagnetic shielding sheet and a method of manufacturing the same, including a step of forming a metal plated layer of a metal-plated transparent substrate and a conductive treatment layer into a mesh shape by a port lithography method. According to this method, since the electrolytic plating layer is formed through the conductive treatment layer without using an adhesive for the transparent substrate, in addition to eliminating the problem of warpage, the roughness of the metal foil is transferred to the surface of the adhesive layer and the surface of the opening Since there is no problem of becoming a rough surface, the transparency of the mesh opening part was favorable even without adding a transparency process, and the problem of the fall of transparency was able to be solved to some extent. And this manufacturing method can make the film thickness of a metal layer thin compared with the method of bonding a metal foil. However, in order to express electromagnetic wave shielding, there is a limit to thinning, and a thickness of at least 1 μm or more, preferably about 3 μm is required. Therefore, even if the manufacturing method of patent document 2 tends to improve to some extent compared with the manufacturing method of patent document 1, the problem of bubble mixing in the process of laminating the said electromagnetic wave shielding sheet and an optical filter is fully solved. It wasn't.

For example, although the problem of the bubble of the composite filter obtained by heat-laminating process in a vacuum atmosphere using an autoclave etc. can be eliminated, in that case, there exists a problem of increasing a process number and an equipment burden.

The present invention has been made to solve the above problems, to reduce the burden on the equipment or extra material in a short process to prevent the mixing of bubbles into the mesh surface to obtain a high-transparency composite filter with good yield and inexpensive electromagnetic waves It aims at providing the manufacturing method of the composite filter for displays which consists of a laminated body of a shielding sheet and an optical filter.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to achieve the said objective, the manufacturing method of obtaining the composite filter for a display achieves the said objective by laminating | stacking the electromagnetic wave shielding sheet which has a conductor layer of a specific dimension, and the optical filter which has a specific adhesive bond layer. The discovery that it can do it came to complete this invention.

That is, this invention is an electromagnetic wave shielding sheet by which the conductor layer which has the mesh-shaped area | region which can cover all the image display areas of a display applied to one surface of (A) transparent base material is laminated | stacked at least, The line part of the said mesh-shaped area | region A step of preparing an electromagnetic wave shielding sheet having a height of 3 µm or less, an opening width of an opening of the mesh-shaped region of 150 µm or more, and no covering of the flattening layer in the opening of the mesh-shaped region, and (B) an adhesive layer on one side Is laminated, and the adhesive layer side of the adhesive optical filter having fluidity at the time of adhesion and lamination and having a peeling resistance of 5 to 30 N / 25 mm is laminated toward the conductor layer side of the electromagnetic shielding sheet. It is a manufacturing method of the composite filter for display which consists of a laminated body of the electromagnetic wave shielding sheet which has a process to make it, and an optical filter.

According to the manufacturing method of the present invention, by using a combination of a mesh-shaped region having a specific shape dimension and a specific adhesive layer, the electromagnetic shielding sheet and the optical filter can be omitted while eliminating the vacuum suction process such as the transparent surface to the mesh surface and the autoclave treatment. Since bubbles can be prevented from entering into the openings of the mesh-shaped region at the time of lamination and bonding, the problem that the blur amount (haze) of the composite filter due to light scattering of the bubbles rises can be avoided, and the transparency A high composite filter can be obtained with good production efficiency.

The present invention is an electromagnetic wave shielding sheet formed by stacking at least a conductor layer having a mesh-shaped region capable of covering all of the image display regions of a display applied to one side of the transparent substrate, and the height of the line portion of the mesh-shaped region. Is 3 µm or less, the opening width of the opening of the mesh region is 150 µm or more, and the step of preparing an electromagnetic shielding sheet having no covering of the planarization layer in the opening of the mesh region, and (B) an adhesive layer on one side The adhesive layer is laminated, and the adhesive layer side of the adhesive optical filter having fluidity at the time of adhesion and lamination and having a peeling resistance of 5 to 30 N / 25 mm is laminated toward the conductor layer side of the electromagnetic shielding sheet. It is a manufacturing method of the composite filter for display which consists of a laminated body of the electromagnetic wave shielding sheet which has a process, and an optical filter.

In the manufacturing method of the composite filter for a display of this invention, the electromagnetic wave shielding sheet provided with the mesh-shaped conductor layer which is comparatively thin in thickness, and has the opening width of a comparatively wide opening, and the adhesive bond layer which has fluidity | liquidity and has a specific peeling resistance value By combining the adhesive optical filter to have, the adhesive layer spreads to every corner in the opening of the mesh-shaped conductor layer, and since the adhesive layer hardly blows air bubbles, air bubbles are mixed even when the pressurized portion is laminated without heating to a high temperature in an atmospheric pressure atmosphere. Can be suppressed to improve transparency.

Hereinafter, each process is explained in full detail.

<(A) step of preparing electromagnetic shielding sheet>

In the process of (A) in this invention, it is an electromagnetic wave shielding sheet in which the conductor layer which has a mesh-shaped area | region which can cover all the image display areas of the display applied to one side of a transparent base material is laminated | stacked at least, The said mesh-shaped The electromagnetic wave shielding sheet which has the height of the line part of an area | region is 3 micrometers or less, the opening width of the opening part of a mesh-shaped area | region is 150 micrometers or more, and is not covering the planarization layer in the opening part of a mesh-shaped area | region is prepared.

1 and 2 show an example of an electromagnetic shielding sheet used in the present invention. 1 is a cross-sectional view of an example of an electromagnetic shielding sheet used in the present invention. In the electromagnetic wave shielding sheet 1 of the present invention, as shown in Fig. 1, a conductor layer 12 including at least a mesh-shaped region 101 is laminated on one surface of the transparent substrate 11. For example, the conductive layer 12 may be provided with a grounding region at a portion that does not affect image display around the mesh-shaped region 101. The grounding area is usually provided with the same layer structure as the mesh-shaped area 101 and does not form an opening, and is provided because it is easy to take ground when provided in the display. 2 is a perspective view of an example of an electromagnetic shielding sheet used in the present invention. The conductor layer 12 forming the mesh-shaped area 101 is a mesh shape in which the openings 103 are densely arranged, and the mesh-shaped area is composed of the line part 104 forming a frame with the opening 103. It is.

The electromagnetic wave shielding sheet of the present invention may be formed by further laminating a layer having no conductivity on the front and back surfaces of the conductor layer. As a layer which does not have the said electroconductivity, the rustproof layer, blackening layer, etc. which do not have electroconductivity are mentioned, for example. Even if a rustproof layer, a blackening layer, etc. have electroconductivity, it is contained in a conductor layer in this invention. The non-conductive layer further laminated on the front and back surfaces of the conductor layer is integrated with the conductor layer to form a mesh-shaped region or a grounding region.

The electromagnetic shielding sheet may have a continuous band shape or a sheet shape depending on the method of bonding the adhesive optical filter.

EMBODIMENT OF THE INVENTION Hereinafter, the electromagnetic wave shielding sheet used for this invention is demonstrated in order from the transparent base material 11.

[Transparent mention]

The transparent base material 11 is a layer for reinforcing the mesh layer of weak mechanical strength. Therefore, if it has light transmittance with mechanical strength, after considering other heat resistance, insulation, etc. suitably, what is necessary is just to select and use according to a use. As a specific example of a transparent base material, it is the board which consists of organic materials, such as resin, a sheet | seat and sheet | seats (a film.

As transparent resin used as a board | plate, a sheet | seat, etc. which consist of the said organic materials, For example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, a terephthalic acid-isophthalic acid-ethylene glycol copolymer, terephthalic acid-cyclohexane dimethanol ethylene Polyester resins such as glycol copolymers, polyamide resins such as nylon (6), polyolefin resins such as polypropylene and polymethylpentene, acrylic resins such as polymethyl methacrylate, polystyrene, styrene-acrylonitrile Cellulose resins such as copolymers, cellulose resins such as triacetyl cellulose, imide resins, polycarbonate resins, and the like.

In addition, these resins are used alone or as a plurality of mixed resins (including polymer alloys) as the resin material, and are used as a single layer or a laminate of two or more layers. In the case of the resin sheet, uniaxially stretched or biaxially stretched stretched sheet is more preferable in view of mechanical strength.

Moreover, you may add additives, such as a ultraviolet absorber, a filler, a plasticizer, an antistatic agent, suitably in these resin as needed.

Moreover, as glass of the said glass plate, there exist quartz glass, borosilicate glass, soda-lime glass, etc., More preferably, thermal expansion coefficient is small, it is excellent in dimensional stability and workability in high temperature heat processing, and also the alkali component is contained in glass. An alkali free glass etc. which are not contained are mentioned, It can also be combined with the electrode substrate used as a front substrate of a display, etc.

Moreover, the thickness of a transparent base material should just be based on a use, and there is no restriction | limiting in particular, When it consists of transparent resin, although it is about 12-1000 micrometers normally, Preferably it is 50-500 micrometers. On the other hand, when a transparent base material is a glass plate, about 1-5 mm is suitable normally. In any material, when the thickness is less than the above, the mechanical strength is insufficient, resulting in warpage, loosening, breakage, and the like, and when the thickness is in excess of the above, in addition to the increase in cost due to excessive performance, the thickness becomes difficult.

In addition, the transparent substrate may be used as a front substrate which is one component of a display main body including a front substrate and a back substrate, but in the form of using an electromagnetic shield filter as a front filter disposed in front of the front substrate, The sheet is superior to the plate in terms of lightness, and the resin sheet is superior to the glass plate in terms of being not broken.

In addition, from the point which can continuously manufacture an electromagnetic wave shield filter and improve productivity, it is preferable to handle a transparent base material in the form of a continuous strip | belt-shaped sheet at least in the initial stage of manufacture, such as mesh layer formation.

In this regard, the resin sheet is a preferred material as the transparent base material, but among the resin sheets, polyester resin sheets such as polyethylene terephthalate and polyethylene naphthalate are particularly preferable in terms of transparency, heat resistance, cost, and the like. The biaxially stretched polyethylene terephthalate sheet is most suitable. Moreover, although the transparency of a transparent base material is so good that it is high, it is preferable that the light transmittance which becomes 80% or more in visible light transmittance is preferable.

Moreover, the transparent base material, such as a resin sheet, suitably carries out well-known easily-adhesive processes, such as corona discharge treatment, plasma treatment, ozone treatment, frame treatment, primer treatment, preheating treatment, dust removal treatment, vapor deposition treatment, and alkali treatment, on its surface. You may carry out.

[Conductor Layer]

The conductor layer is a layer having conductivity, and is a layer in charge of the electromagnetic wave shielding function, and has an opening in the shape of a mesh even if it is opaque, thereby achieving both electromagnetic shielding performance and light transmittance.

In this invention, the material and formation method of the conductor layer which form the mesh area | region are not specifically limited, The various conductor layers in the conventionally well-known light-transmitting electromagnetic wave shielding sheet can be employ | adopted suitably. The conductor layer is usually mainly composed of a metal layer, and in addition thereto, includes a conductive treatment layer to be described later, and optionally a blackening layer or rustproof layer having conductivity.

Although the shape of a mesh is not specifically limited in particular, As a shape of an opening part, a square is typical. The shape of the opening includes, for example, a triangle such as an equilateral triangle, a rectangle such as a square, a rectangle, a rhombus, a trapezoid, a polygon such as a hexagon, or a circle, an ellipse, or the like. The mesh has a plurality of openings formed in these shapes, and between the openings is usually a line-shaped line portion having a uniform width, and usually between the openings and the openings is the same shape and the same size throughout. To illustrate the specific size, in view of the aperture ratio and the invisibility of the mesh, the width of the line portion 104 between the openings is referred to as the line width W, as shown in FIG. It is preferable that it is 20 micrometers or less. However, in order to express the electromagnetic wave shielding effect and prevent breakage, it is desirable to secure at least 5 µm or more. In addition, the opening width of an opening part is represented by [line pitch P]-[line width W], and in this invention, it is 150 micrometers or more, Preferably it is 200 micrometers or more, and it is a light transmittance and the optical filter mentioned later and It is preferable at the point that a bubble is hard to remain in an opening part at the time of lamination | stacking. However, in order to express the electromagnetic wave shielding property of MHz to GHz, it is set to 3000 micrometers or less. Moreover, in this invention, it is preferable to make the thickness H of the mesh area | region finally obtained, ie, the height H of the line part 104 between an opening part, 3 micrometers or less. In such a case, even when the planarization process on the mesh surface is omitted before lamination with the optical filter, the adhesive layer easily enters into the opening of the metal mesh uniformly at the time of lamination and adhesion of the electromagnetic shielding sheet and the optical filter. This is because bubbles hardly remain. In this case, the problem that the blur amount (haze) of the combined filter by light scattering of the said bubble rises can be avoided, and a composite filter with high transparency can be obtained with high production efficiency. Considering the point of the electromagnetic shielding function so that the electric resistance value of the metal increases so that the electromagnetic shielding effect is not easily impaired, the thickness of the conductor layer is required to be 1 m or more when the dimensional shape of the mesh-shaped region is in the above-described range. Therefore, it is more preferable that the height of the line portion of the mesh-shaped region is 1 to 3 mu m. In addition, the height of the line portion of the mesh-shaped region refers to the total thickness including both the conductor layer 12 and the thickness of the layer forming the opening portion 104 to form the opening portion among the layers having no stacked conductivity. In addition, the bias angle (angle formed between the line portion of the mesh and the outer periphery of the electromagnetic shielding sheet) of the mesh-shaped region may be appropriately set to an angle at which moire is hard to occur in consideration of the pixel pitch of the display and the light emission characteristics.

Although it does not restrict | limit especially as a method of preparing the electromagnetic wave shielding sheet which has such a mesh-shaped area | region, Especially in this invention, it is possible to make it the thickness of the desired thin mesh in this invention especially, and the yield in a short process is In order to be able to manufacture it easily and inexpensively, a metal thin film is formed on one side of the transparent substrate by sputtering or the like to form a conductive treatment layer, and a transparent substrate having a metal layer formed as a metal plating layer by electroplating is prepared thereon, In particular, it is particularly preferable to use a method of forming a metal plating layer and a conductive treatment layer of a metal-plated transparent substrate into a mesh shape by a photolithography method (for example, Japanese Patent Laid-Open No. 3502979 and Japanese Patent Laid-Open No. 2004-241761). desirable. According to this method, an electromagnetic wave shielding sheet excellent in transparency and mesh precision is obtained. Then, the method of preparing the electromagnetic wave shielding sheet which has a mesh-shaped area | region by the said method is demonstrated in detail.

An example of the electromagnetic wave shielding sheet in which at least one conductor layer forming a mesh region on one surface of the transparent substrate formed by the above method is laminated is shown in FIG. 3. 3 is a cross-sectional view taken along line AA and BB of FIG. FIG. 3A shows a cross section crossing the opening, the opening 103 and the line 104 are alternately configured, and FIG. 3B shows a cross section terminating the line 104, The line part 104 which consists of the conductor layers 12 is formed continuously. In Fig. 3, the mesh-shaped region 101 includes a conductive treatment layer 13 and a metal plating layer 14 (hereinafter, collectively referred to simply as a metal layer).

(Formation of conductive layer)

Prior to the metal electrolytic plating described later, the transparent base material 11 as described above is subjected to a conductive treatment to form a conductive treatment layer. As a method of the said conductive process, what is necessary is just to form the thin film of the material which has well-known electroconductivity. As said conductive material, it consists of metals, such as gold, silver, copper, iron, nickel, chromium, or an alloy of these metals, for example. Moreover, transparent metal oxides, such as tin oxide ITO and ATO, may be sufficient. The conductive treatment may be a single layer or multiple layers, and these materials are formed by a known vacuum deposition method, sputtering method, electroless plating method, or the like to form the conductive treatment layer 13. Since the thickness of the said conductive process layer 13 should just acquire the electroconductivity required at the time of plating, it is preferable that it is a very thin layer about 0.001-1 micrometer.

(Metal plating layer)

The metal plating layer 14 is formed in the surface of the said conductive process layer 13 by the electroplating method, and is called a metal layer. As a material of the said metal plating layer 14, the metal which has electroconductivity enough to shield electromagnetic waves, such as gold, silver, copper, iron, nickel, chromium enough, or the alloy containing these metals can be applied, for example. have. The metal plating layer 14 may not be a single member, or may be multilayer, and copper or a copper alloy is preferable from the ease of electroplating and electroconductivity. In addition, when providing a blackening layer and / or a chromate (processing) layer, copper or a copper alloy is preferable also from the adhesive force of a metal plating layer, a blackening layer, or a chromate layer. In the present invention, the thickness of the metal plating layer 14 is preferably about 1 to 2 µm in order to set the height of the line portion of the mesh region to 1 to 3 µm as described above. If the height of the line portion of the mesh-shaped region is less than or equal to the thickness, the electric resistance of the metal increases, and the electromagnetic shielding effect is easily damaged. If the thickness is higher than this, the step difference between the line portion and the opening increases when the mesh is processed to form an adhesive layer. When it does, bubbles tend to remain.

(Black layer)

In order to absorb the external light to the electromagnetic wave shielding sheet 1 and to improve the visibility of the image of the display, it is preferable to perform a blackening process on the observation side of the mesh-shaped region 101 to exhibit a feeling of contrast. For this reason, as shown in FIG. 4, blackening layer 15A and / or 15B is provided in at least one surface of the metal plating layer 14 as needed. The blackening layer roughens the surface of the metal plating layer 14, but gives light absorbency (blackening) over the entire visible light spectrum, or uses both in combination. In the case where the blackening layer 15A is provided on the surface of the transparent substrate 11, the transparent substrate may be subjected to conductive treatment, and then the metal plating layer 14 may be provided after the black plating layer is provided.

As the blackening layers 15A and 15B, formation of metal oxides and metal sulfides and various methods can be applied. In the case of iron, an oxide film (blackening film) of about 1 to 2 µm is usually formed by exposing it for 10 to 20 minutes at a temperature of about 450 to 470 ° C in steam, but even an oxide film (blackening film) by chemical treatment such as concentrated nitric acid is used. good. In the case of copper, a cathode electrodeposition in which the copper is subjected to cathodic electrolytic treatment in an electrolytic solution composed of sulfuric acid, copper sulfate, cobalt sulfate and the like to attach cationic particles is preferable. By providing the said cationic particle, more roughening and a black color can be obtained simultaneously. As said cationic particle, although the copper particle and the alloy particle of copper and another metal can be applied, Preferably it is a particle | grain of a copper-cobalt alloy. As for the particle size of the said cationic particle, about 0.1-1 micrometer of average particle diameters are preferable from the point of black concentration.

Preferable black density | concentration of the said blackening layer is 0.6 or more. In addition, the measurement method of black density was set to density standard ANSIT as 10 degree of observation viewing angle, observation light source D50, illumination type using GRETAG SPM100-11 (made by Kimoto company, brand name) of COLOR CONTROL SYSTEM, and a test piece after white calibration Measure Moreover, as a light reflectance of the said blackening layer, 5% or less is preferable. The light reflectance is measured in accordance with JIS-K7105 using a haze meter HM150 (manufactured by Murakami Co., Ltd., trade name). In addition, instead of measuring the reflectance, a color difference meter may be used to represent the Y value of the reflection, and in this case, 10 or less is preferable as the Y value.

(Rustproof floor)

In addition, when the blackening layer is provided to cover at least one surface of the metal plating layer 14, the antirust layer 16A and / or 16B is provided so as to cover at least one surface of the blackening layer 15A and / or 15B. It is desirable to.

The rust preventive layers 16A and 16B are preferably provided on at least the blackening layer in order to prevent the rust preventive function and the fall or deformation of the blackening layer. As the rustproof layer 16B, an oxide of nickel, zinc and / or copper or a chromate treated layer can be used. Oxide formation of nickel, zinc and / or copper may be a known plating method, and the thickness is about 0.001 to 1 µm, preferably 0.001 to 0.1 µm.

In the case where the antirust layer 16A is provided on the blackening layer 15A surface of the transparent substrate 11 surface, the transparent substrate may be electrically conductive, and the antirust layer 16A may be provided using the same material and method as in the above 16B. . In this case, a black plating layer (corresponding to blackening layer 15A), a metal plating layer 14, and a blackening layer 15B and an rustproof layer 16B are sequentially provided on the surface of the rustproof layer 16A. .

The blackening layers 15A and 15B and the rustproof layers 16A and 16B may be provided at least on the observation side, and the contrast is improved to improve the visibility of the display image. In addition, it may be provided on the other side, that is, the display surface side, and stray light generated from the display can be suppressed, so that the visibility of the image is further improved.

Next, the process of making the conductor layer on the transparent base material provided as mentioned above into a mesh shape by the photolithography method is demonstrated.

First, a resist layer is provided on the surface of the conductor layer on the transparent substrate prepared as described above, for example, the metal layer (metal plating layer) 14 on the transparent substrate, mesh patterned, and the metal layer of the portion not covered with the resist layer ( After 14) is removed by etching, a metal layer having a mesh shape is formed by a so-called photolithography method in which the resist layer is removed. Moreover, existing equipment can be used, and by performing most of these manufacturing processes continuously, it is possible to produce at low cost with good quality, high production efficiency and good yield.

(Photolithography)

After the resist layer is provided in the form of a mesh pattern on the conductor layer surface of the laminate and the conductor layers (the conductive layer 13 and the metal plating layer 14) of the portion not covered with the resist layer are removed by etching, the resist It is made into a mesh shape by the photolithographic method which removes a layer. In addition, in that case, when the layer which does not have other electroconductivity other than a conductor layer is also laminated | stacked, in the area | region corresponding to an opening part, another layer is also etched away with a conductor layer.

(Masking)

First, the mesh-shaped area | region 101 is formed by making the conductor layer side surface of the laminated body of the transparent base material 11 and the conductor layer 12 into a mesh shape by the photolithographic method. It is preferable that this process also processes the roll-shaped laminated body wound continuously in strip shape (referred to a winding process and a roll to roll process). Masking, etching, and resist peeling are carried out in a stretched state without loosening while conveying the laminate continuously or intermittently. When glass is used as the transparent base material 11, it processes every sheet (referred to a sheet processing and a sheet process).

First, masking is performed by coating a photosensitive resist on the conductor layer 12 forming a mesh-shaped region, drying the film, and then exposing the film to a predetermined pattern plate (photomask) to perform water development, and to treat the film. Carry out and bake. In addition, both the negative type and the positive type of the photosensitive resist can be used. In the case where the photosensitive resist is negative, the mesh pattern of the pattern plate is a positive (positive) line part. In addition, when the photosensitive resist is positive type, the mesh pattern of a pattern plate shall be negative (negative) with a transparent opening. Moreover, as an exposure pattern, it is a desired pattern as an electromagnetic wave shielding sheet, and is comprised by the pattern of the minimum mesh-shaped area | region. In addition, although illustration is abbreviate | omitted as needed, the pattern of a grounding area | region is added to the outer periphery of a mesh-shaped area | region.

The application of the resist is carried out on the surface of the conductor layer 12 which forms a mesh-shaped region while continuously or intermittently conveying a strip-shaped laminate (the laminate of the transparent base material 11 and the conductor layer 12) in the winding process. Resins such as casein, PVA, gelatin and the like are performed by methods such as dipping (immersion), curtain coat, and shedding. In addition, a resist may use dry film resist instead of application | coating, and can improve workability. Baking is carried out at 200 to 300 ° C in case of casein resist, but a temperature as low as possible is preferred in order to prevent warping of the laminate.

(etching)

Etching is performed after masking. As the etching liquid used for the said etching, in this invention which performs etching continuously, the aqueous solution of ferric chloride or cupric chloride which can facilitate circulation use is preferable. Further, the etching is basically the same as the equipment and process for manufacturing a shadow mask for a tube of color TV for etching a strip of continuous steel, especially a thin plate having a thickness of 20 to 80 µm. Sheet processing in the case of using glass as the transparent base material 11 is also performed from a long time ago. After etching, it is good to dry, after performing water washing, resist peeling with alkaline liquid, and washing. Since the transparent base material is exposed on the surface of the mesh opening formed in this way, transparency of a mesh opening is favorable.

<(B) Process of laminating adhesive layer of adhesive optical filter and conductor layer of electromagnetic shielding sheet>

In the process of (B) which concerns on this invention, an adhesive bond layer is laminated | stacked on one surface, the said adhesive bond layer has the fluidity | liquidity at the time of adhesion | attachment and lamination | stack, and the adhesive optical whose peeling resistance value is 5-30 N / 25 mm. The adhesive layer side of the filter is laminated toward the conductor layer side of the electromagnetic shielding sheet.

5 is a cross-sectional view of an example of the adhesive optical filter used in the present invention. As shown in Fig. 5, the adhesive optical filter 20 used in the present invention is obtained by laminating an adhesive layer 22 on one side of the optical filter 21, and the optical filter 21 is a transparent substrate. (23) and the function expression layer 24 are laminated | stacked. Although it does not specifically limit as a function expression layer, For example, a near-infrared absorption layer, a neon light absorption layer, an ultraviolet absorption layer, an antireflection layer, a hard coat layer, an antifouling layer, an anti-glare layer, etc. are mentioned. Each of these function expression layers, a transparent base material, and an adhesive layer may be a single layer, may be a multilayer, and may be the structure by which a function expression layer and a transparent base material were laminated | stacked on each other. Moreover, the function expression layer may serve as the function of a transparent base material, and may be comprised from a function expression layer and an adhesive bond layer. Or the adhesive bond layer may be provided between each function expression layer, or between a function expression layer and a transparent base material, respectively. The optical filter used for this invention shall have an adhesive bond layer on at least one surface, and shall have adhesiveness. Therefore, there may be a structure in which an adhesive layer is provided on the function expression layer side.

The shape of the adhesive optical filter may be either a continuous band shape or a sheet shape depending on the method of bonding to the electromagnetic wave shielding sheet.

[Layer Structure of Adhesive Optical Filter]

(Transparent mention)

As a transparent base material used for an optical filter, the transparent base material like what was described in an electromagnetic wave shielding sheet can be used.

(Function expression layer)

In a function expression layer, as a near-infrared absorption layer, you may laminate | stack a commercial film (for example, the Toyo Seiki Co., Ltd. product, brand name No2832) which has a near-infrared absorber with an adhesive agent, or may apply and apply a near-infrared absorbing dye to a binder. As the near-infrared absorbing dye, when the optical filter is applied to the front surface of the plasma display panel, which is a typical use, the plasma display panel has a near-infrared band generated when emitting light using xenon gas discharge, that is, a wavelength band of 800 nm to 1100 nm. It is preferable that it is absorbing and the transmittance | permeability of the near-infrared ray of the said band | band is 20% or less, and also 10% or less. At the same time, it is preferable that the near-infrared absorbing layer has sufficient light transmittance in the visible light region, that is, in the wavelength band of 380 nm to 780 nm. Specifically as a near-infrared absorbing dye, a polymethine type compound, a cyanine type compound, a phthalocyanine type compound, a naphthalocyanine type compound, a naphthoquinone type compound, an anthraquinone type compound, a dithiol type compound, an immonium type compound, a dimonium type compound, an amino compound Organic near-infrared absorbing pigments of tin compounds, pyryllium compounds, ceryllium compounds, squarylium compounds, copper complexes, nickel complexes, dithiol metal complexes, tin oxide, indium oxide, magnesium oxide, titanium oxide, chromium oxide And one or two or more inorganic near-infrared absorbing dyes such as zirconium oxide, nickel oxide, aluminum oxide, zinc oxide, iron oxide, and oxide oxide, lead oxide, bismuth oxide and lanthanum oxide can be used in combination. Moreover, as binder resin, resin, such as polyester resin, a polyurethane resin, an acrylic resin, an epoxy resin, is used. Moreover, as drying and hardening method of binder resin, the dry solidification method by drying of the solvent (or dispersion medium) from a solution (or emulsion), the polymerization by energy, such as heat, an ultraviolet-ray, an electron beam, the hardening method using crosslinking reaction, or A curing method using a reaction such as crosslinking with a functional group such as a hydroxyl group in the resin or an epoxy group and an isocyanate group in a curing agent, polymerization, or the like can be applied.

The neon light absorbing layer of the functional expression layer is provided for absorbing the light emission spectrum of neon light emitted from the plasma display panel, that is, neon atom, when the optical filter is used for the plasma display. Since the emission spectrum band of neon light is wavelength 550-640 nm, it is preferable to design so that the spectral transmittance of a neon light absorption layer may be 50% or less in wavelength 550nm. The neon light absorbing layer can be formed by dispersing a dye conventionally used as a dye having an absorption maximum within a wavelength band of at least 550 to 640 nm with a binder resin exemplified in the near infrared absorbing layer. As a specific example of the said pigment | dye, a cyanine series, an oxonol series, a methine series, a subphthalocyanine series, or a porphyrin system etc. are mentioned.

Moreover, as a ultraviolet absorber in a function expression layer, it can form, for example disperse | distributing a ultraviolet absorber with binder resin. As an ultraviolet absorber, what consists of inorganic compounds which consist of organic compounds, such as benzotriazole and benzophenone, zinc oxide of a particulate form, cerium oxide, etc. is mentioned. As said binder resin, resin mentioned to the said near-infrared absorption layer part can be used.

As the anti-reflection layer (AR layer) among the functional expression layers, for example, a multilayer structure in which a low refractive index layer and a high refractive index layer are alternately stacked is generally used, and a dry method such as vapor deposition, sputtering, or a wet method such as coating is also used. Can be formed. As the low refractive index layer, silicon oxide, magnesium fluoride, a fluorine-containing resin or the like is used, and for the high refractive index layer, titanium oxide, zinc emulsion, zirconium oxide, niobium oxide or the like is used.

Moreover, as a hard-coat layer (HC layer) among a function expression layer, For example, polyfunctional (meth) acrylate prepolymers, such as polyester (meth) acrylate, urethane (meth) acrylate, and epoxy (meth) acrylate, Or trifunctional or higher polyfunctional (meth) acrylate monomers such as trimetholpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate alone or two of them. It can shape as a coating film using the ionizing radiation curable resin mix | blended and mix | blended and mix | blended more than. In addition, (meth) acrylate here is a complex notation which means an acrylate or a methacrylate.

In addition, as an anti-glare layer (AG layer) in a function expression layer, it reflects external light to a layer surface by forming a coating film which added inorganic fillers, such as silica, in the resin binder, or shaping | molding using a shaping sheet, a shaping | molding plate, etc. It can form as a layer which provided fine unevenness | corrugation. As resin of a resin binder, since surface strength is calculated | required as a surface layer, curable acrylic resin and ionizing radiation curable resin etc. are used suitably similarly to the said hard coat layer.

In addition, in the function expression layer, the flameproof layer can generally use a siloxane type, a fluorinated alkylsilyl compound, etc. in the water-repellent and oil-repellent coat. Fluorine or silicone resins used as water repellent coatings can be suitably used. For example, when the low refractive index layer of the antireflection layer is formed of SiO ₂ , a fluorosilicate water repellent paint is preferably used.

(Adhesive layer)

Next, the adhesive layer laminated | stacked on one side which is an essential layer in the optical filter used for this invention is demonstrated.

If the said adhesive bond layer is a layer which can adhere | attach the said optical filter and the said electromagnetic wave shielding sheet, and has fluidity | liquidity at the time of adhesion | attachment and lamination | stacking, and the peeling resistance value is 5-30 N / 25mm, the kind etc. are specifically limited Various natural or synthetic resins are used.

The adhesive bond layer which concerns on this invention is an adhesive bond layer which has fluidity at the time of adhesion | attachment and lamination | stacking with the said electromagnetic wave shielding sheet. In the case of such an adhesive layer, even if the mesh surface of the electromagnetic shielding sheet is not flattened, since the adhesive layer spreads to every corner of the opening of the mesh at the time of bonding and laminating the electromagnetic shielding sheet and the optical filter, bubbles are formed in the opening. It can be prevented from remaining. Therefore, the problem that the blur amount (haze) of the composite filter due to the light scattering of the bubbles increases can be avoided while omitting the planarization process on the mesh surface, and an optical filter with high transparency can be obtained with high production efficiency. . Therefore, the fluidity | liquidity which the adhesive bond layer in this invention has is such that fluidity | liquidity which a deformation | transformation of an adhesive bond layer replaces with the air in an opening part of a mesh-shaped area | region can fill the said opening part. The fluidity | liquidity which the adhesive bond layer in this invention has is a thing which does not have a restoring force with respect to an external force, or has some, and deform | transforms and displaces virtually unlimitedly. For example, it encompasses Newton viscosity such as water, dilatancy or non-Newton viscosity such as thixotropic, or creep deformation. Normally, when the adhesive is pressed onto the mesh surface, it is suitable to have a viscosity of about 100000 cps or less, preferably about 50000 cps or less, as an example (measured value in a type C clay system. Value). However, after adhering and laminating the mesh opening of the electromagnetic wave shielding sheet with the adhesive optical filter, the fluidity of the adhesive may be lowered as necessary. That is, at the time of adhesion | attachment with an electromagnetic wave shielding sheet, when filling a mesh opening part reliably, the fluidity | liquidity of an adhesive agent is so preferable that it is high. However, after adhesion and lamination, the flowability of the adhesive is not necessary. On the contrary, when the adhesive flows out from the lamination interface between the electromagnetic shielding sheet and the cut adhesive optical filter, or when a dye (coloring agent) is added to the adhesive layer, This is because discoloration and fading of the dye may be promoted, which is undesirable.

It is preferable that the adhesive bond layer which has fluidity concerning this invention consists of an adhesive. An adhesive means here 1 type of adhesive agent, and means what can be adhere | attached only by the adhesiveness of the surface by the pressure of the grade which is simply appropriate, normally lightly pressed by hand at the time of adhesion | attachment in an adhesive agent. In order to develop the adhesive force of the pressure-sensitive adhesive, physical energy or action such as heating, humidification, radiation (such as ultraviolet rays or electron beams) irradiation is usually unnecessary, and chemical reactions such as polymerization reactions are also unnecessary. Moreover, the adhesive can maintain the adhesive force of the degree which can be re-peeled even after adhesion over time. There is no restriction | limiting in particular as such an adhesive, The thing which is conventionally used as a well-known adhesive has appropriate adhesiveness (adhesive force), transparency, coating aptitude, and does not change a transmission spectrum of the optical filter used in this invention substantially. Choose appropriately.

The adhesive layer which has the fluidity | liquidity which concerns on this invention should just have fluidity at the time of adhesion | attachment and lamination | stacking, In addition to the adhesive bond layer which consists of said adhesive, the adhesive bond layer which consists of resin containing a solvent may be sufficient, and it does not contain a solvent and itself at room temperature. The adhesive layer may be made of a natural rubber having a fluidity, a synthetic resin, or a syrup-like adhesive in which the polymer is dissolved in a reaction monomer. Moreover, the hot-melt adhesive layer which melts by adding an appropriate temperature and has fluidity may be sufficient. Moreover, it is an adhesive bond layer containing a liquid polymerization reactive monomer at room temperature, and may be an adhesive bond layer which takes the form which hardens by light and / or heat after lamination | stacking. Moreover, as a method of reducing the fluidity | liquidity of an adhesive bond layer as needed after adhesion and lamination | stacking, for example, a crosslinking agent is previously added to an adhesive bond layer, and after adhere | attaching with an electromagnetic wave shielding sheet, crosslinking or superposing | polymerizing an adhesive by heating, ultraviolet irradiation, etc. The method to make it, etc. are mentioned as an appropriate method.

An acrylic adhesive is mentioned as an adhesive used suitably. The acrylic pressure sensitive adhesive is polymerized including at least (meth) acrylic-acid alkylester monomer. It is common that it is a copolymer of the (meth) acrylic-acid alkylester monomer which has a C1-C18 alkyl group, and the monomer which has a carboxyl group. In addition, in this invention, (meth) acrylic acid means acrylic acid and / or methacrylic acid.

As an example of the (meth) acrylic-acid alkylester monomer used here, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, sec-propyl (meth) acrylate, n-butyl (meth) acrylate, ( Sec) butyl acrylate, tert-butyl (meth) acrylate, isoamyl (meth) acrylate, n-hexyl (meth) acrylate, cyclohexyl (meth) acrylate, n-octyl (meth) acrylate, (meth) acrylic acid Isooctyl, 2-ethylhexyl (meth) acrylic acid, undecyl (meth) acrylic acid, lauryl (meth) acrylate, etc. are mentioned.

In addition, the said (meth) acrylic-acid alkylester is copolymerized normally in the quantity of 30-99.5 weight part in an acrylic adhesive.

Moreover, as a monomer which has a carboxyl group which forms an acrylic adhesive, the monomer containing carboxyl groups, such as (meth) acrylic acid, itaconic acid, crotonic acid, maleic acid, monobutyl maleate, and (beta) -carboxyethyl acrylate, is mentioned.

Moreover, the monomer which has another functional group may copolymerize in the acrylic adhesive used by this invention in the range which does not impair the characteristic of an acrylic adhesive other than the above. As an example of the monomer which has another functional group, the monomer containing hydroxyl groups, such as (meth) acrylic acid 2-hydroxyethyl, (meth) acrylic acid 2-hydroxypropyl, and allyl alcohol: (meth) acrylamide, N-methyl (meth) Monomers containing amide groups such as acrylamide and N-ethyl (meth) acrylamide; Monomers containing an amide group such as N-methol (meth) acrylamide and dimethol (meth) acrylamide and a methirol group; Monomers having functional groups such as monomers containing amino groups such as aminomethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate and vinylpyridine; Epoxy-group containing monomers, such as allyl glycidyl ether (meth) acrylic-acid glycidyl ether, etc. are mentioned. In addition to the fluorine-substituted (meth) acrylic acid alkyl ester, (meth) acrylonitrile, and the like, vinyl group-containing aromatic compounds such as styrene and methyl styrene, vinyl acetate, vinyl halide compounds, and the like are exemplified.

In addition, a monomer having another ethylenic double bond can be used for the acrylic pressure-sensitive adhesive used in the present invention, in addition to the monomo having other functional groups as described above. Examples of the monomer having an ethylenic double bond include diesters of α, β-unsaturated diacids such as dibutyl maleate, dioctyl maleate and dibutyl fumarate; Vinyl esters such as vinyl acetate and vinyl propionate; Vinyl ether; Vinyl aromatic compounds such as styrene, α-methylstyrene and vinyltoluene; (Meth) acrylonitrile etc. are mentioned.

Moreover, in addition to the monomer which has an ethylenic double bond as mentioned above, you may use together the compound which has two or more ethylenic double bonds. Examples of such compounds include divinylbenzene, diallyl maleate, diallyl phthalate, ethylene glycol di (meth) acrylate, trimetholpropane tri (meth) acrylate, methylenebis (meth) acrylamide, and the like. Can be.

In addition to the monomers described above, monomers having an alkoxyalkyl chain can be used. As an example of (meth) acrylic-acid alkoxy alkyl ester, (meth) acrylic-acid 2-methoxyethyl, (meth) acrylic-acid methoxyethyl, (meth) acrylic-acid 2-methoxypropyl, (meth) acrylic-acid 3-methoxypropyl, (meth 2-methoxybutyl acrylate, 4-methoxybutyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 3-ethoxypropyl (meth) acrylate, 4-ethoxybutyl (meth) acrylate, etc. Can be mentioned.

Moreover, the homopolymer of a (meth) acrylic-acid alkylester monomer may be sufficient. For example, examples of the (meth) acrylic acid ester homopolymer include methyl poly (meth) acrylate, ethyl poly (meth) acrylate, propyl poly (meth) acrylate, butyl poly (meth) acrylate, octyl poly (meth) acrylate, and the like. Can be mentioned.

As a copolymer containing 2 or more types of acrylate ester units, the methyl (meth) acrylate-ethyl (meth) acrylate copolymer, the methyl (meth) acrylate- (meth) butyl acrylate copolymer, and the (meth) acrylate-methyl (meth) The acrylic acid 2-hydroxyethyl copolymer, the methyl (meth) acrylate- (meth) acrylic acid 2-hydroxy 3phenyloxypropyl copolymer, etc. are mentioned.

As a copolymer of (meth) acrylic acid ester and another functional monomer, a methyl (meth) acrylate-styrene copolymer, a methyl (meth) acrylate-ethylene copolymer, and (meth) acrylic acid methyl (meth) acrylic acid hydroxyethyl- Styrene copolymer is mentioned as an example.

For example, as (meth) acrylic acid ester homopolymer, methyl poly (meth) acrylate, ethyl poly (meth) acrylate, propyl poly (meth) acrylate, butyl poly (meth) acrylate, octyl poly (meth) acrylate, etc. are mentioned. Can be.

As a copolymer containing 2 or more types of acrylate ester units, the methyl (meth) acrylate- (meth) acrylate copolymer, the methyl (meth) acrylate (butyl methacrylate) copolymer, and the (meth) acrylate- (meth) The acrylic acid 2-hydroxyethyl copolymer, the methyl (meth) acrylate- (meth) acrylic acid 2-hydroxy 3phenyloxypropyl copolymer, etc. are mentioned.

As a copolymer of (meth) acrylic acid ester and another functional monomer, a methyl (meth) acrylate-styrene copolymer, a methyl (meth) acrylate-ethylene copolymer, and (meth) acrylic acid methyl (meth) acrylic acid hydroxyethyl- Styrene copolymer is mentioned as an example.

As a commercial item of an acrylic adhesive, For example, brand name: TU-41A (made by Tomoegawa Seisho Sho), brand name: No.591, No.5915, No.5919M, CS9621, LA-50, LA-100, HJ-9210, No. 595B (manufactured by Nitto Denko Co., Ltd.) and the like is suitably used.

As the rubber-based pressure-sensitive adhesive, at least one selected from natural rubber, polyisoprene rubber, polyisobutylene, polybutadiene rubber, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer and the like as a main component One containing species is used.

Moreover, it is preferable to mix | blend antioxidant with an adhesive bond layer. At the interface between the adhesive layer and the conductor layer of the obtained composite filter, an acid component contained in the adhesive can prevent the conductor layer from being oxidized and causing color change.

Moreover, crosslinking agents, such as an isocyanate compound, a tackifier, a silane coupling agent, a filler, etc. can be mix | blended with an adhesive bond layer as needed.

Moreover, you may contain 1 or more types of near-infrared absorbing dye and / or neon light absorbing dye as mentioned above in the said adhesive bond layer. In that case, the light transmittance in the wavelength band of 800 nm-1100 nm is 20% or less, especially 10% or less, and the light transmittance in the wavelength band of 560-630 nm is 30% or less, and 25% or less is especially It is desirable to.

Further, in the present invention, the adhesive layer preferably has a peeling resistance of 5 to 30 N / 25 mm, more preferably 5 to 25 N / 25 mm, and particularly 10 to 20 N / 25 mm to the surface smooth glass plate. desirable. As a surface smooth glass plate, the glass used for the liquid crystal, the panel for PDP, etc. are mentioned specifically, for example, normally float glass.

Here, the peeling resistance value with respect to the surface smooth glass plate can be measured as follows. What coated the adhesive layer at 25 g / m <2> (at the time of drying) on one side of the biaxially stretched PET film with a thickness of 100 micrometers is cut out to 150 micrometers in length, and 25 micrometers in width, and this adhesive layer side is directed to the glass plate side. The surface was attached to a glass plate having a thickness of 10 mm degreased, and a tensile tester was used to stretch the glass plate and the PET film at a direction of 300 mm / min in a direction in which both angles were 180 °, and to stretch in an atmosphere of 20 to 25 ° C. It can be measured as a tensile force at the time of peeling.

When the said peeling resistance value is in the said range, it can laminate | stack without mixing a bubble in the opening part of a mesh at the time of laminating | stacking and adhering the electromagnetic wave shielding sheet and optical filter mentioned later.

In addition, when any problem occurs when bonding the obtained composite filter and the display, it is necessary to re-peel only the adhesive optical filter and to bond the optical filter again, but when the peeling resistance value is within the above range, When re-peeling the adhesive optical filter, it is possible to peel easily without causing cohesive failure and interfacial failure.

If the peeling resistance value is less than 5 N / 25 mm, there is a fear that natural peeling or bubbles may occur over time at the electromagnetic shielding sheet-adhesive optical filter interface of the obtained composite filter. Moreover, when the said peeling resistance value exceeds 30 N / 25mm, air bubbles will become easy to mix in the opening part of a mesh in the process of laminating | stacking and adhering the electromagnetic wave shielding sheet and optical filter mentioned later.

The adhesive layer is formed on at least one surface of the optical filter by a known layer forming method, for example, a coating method such as a roll coat, a comma coat, or a gravure coat, or a screen printing or gravure printing that is easily formed in a partial shape. It is possible to form by adopting a printing method such as appropriately. When using an adhesive for an adhesive bond layer, the optical filter after adhesion processing may protect the adhesive face with a well-known separator etc. as needed. As a separator, resin sheets, such as a biaxially stretched polyethylene terephthalate film which carried out the mold release process on the surface of silicone, etc. may be used.

In this invention, it is preferable that the film thickness of such an adhesive bond layer exists in the range of 5-40 micrometers. It is because it becomes possible to planarize the unevenness | corrugation of the mesh in an electromagnetic wave shielding sheet favorably especially when laminating and adhering an electromagnetic wave shielding sheet and an optical filter in this range.

Moreover, you may contain 1 or more types of near-infrared absorbing dye, ultraviolet absorber, and / or neon light absorbing dye as mentioned above in the said adhesive bond layer. By doing in this way, since the function of a some functional layer can be combined as one layer, and it can also be integrated with an adhesive bond layer, it becomes possible to reduce the total thickness, process number, and cost as a composite filter, and it is preferable. In that case, the light transmittance in the wavelength band of 800 nm-1100 nm is 20% or less, especially 10% or less, and the light transmittance in the wavelength band of 560-630 nm is 30% or less, and 25% or less is especially It is desirable to.

[Lamination of Electromagnetic Shielding Sheet and Adhesive Optical Filter]

It is a schematic diagram which obtains the composite filter for displays by bonding and laminating | stacking and laminating | stacking the electromagnetic wave shielding sheet and adhesive optical filter used for this invention.

6, the electromagnetic shielding sheet 1 and the adhesive optical filter 20 are arranged such that the former conductor layer side and the latter adhesive layer face each other, as shown in FIG. A composite filter as shown in (B) can be obtained.

Although it does not specifically limit as a method of sticking and laminating | stacking the said adhesive bond layer to the said conductor layer side, and manufacturing a composite filter, The transparent base material of FIG. 6 (A) using the laminator provided with press parts, such as a press roll. The method of adhering and laminating | stacking by simultaneously pressurizing from (11) and the latter optical filter 21 side is mentioned. In this invention, in order to laminate | stack a mesh-shaped area | region which has the above-mentioned specific dimension, and the above-mentioned specific adhesive bond layer, it is possible to prevent mixing of foam | bubble even if laminating | stacking without pressurizing a part under atmospheric pressure atmosphere. However, in order to improve the fluidity | liquidity of an adhesive bond layer further, it usually heats about 50-80 degreeC in many cases. In any case, according to the present invention, it is sufficient to pressurize by a roll etc. and to heat suitably as needed, and the vacuum suction from the adhesive bond layer side is unnecessary especially. In this case, it is not necessary to use special equipment such as, for example, an autoclave treatment, to reduce the burden on the equipment in a short step, and to eliminate the air bubbles mixed therein.

When the example of lamination is shown again, the roll type laminator is used for the adhesive layer side of the continuous-band-shaped optical filter resin sheet, and the conductor layer side of the continuous-band-shaped electromagnetic wave shielding sheet which forms the mesh area | region by a roll-to-roll method. And laminating.

Although the lamination | stacking method using a roll-to-roll system is good in production efficiency and low cost, it is preferable, but either or both of an electromagnetic wave shielding sheet and an adhesive optical filter may be made into sheet shape, and you may laminate | stack using various laminators.

The laminator may be pressurized against optical filters and electromagnetic wave shielding sheets such as rolls or flat plates, but it is easy to prevent the mixing of bubbles and mixing in a roll-to-roll method, or from the point of continuous production. It is preferable to use a roll type laminator.

Although pressurization at the time of lamination is not specifically limited, For example, when using a roll type laminator, 1-20 kgf / cm is preferable. Although the temperature of the pressurized part at the time of lamination | stacking is not specifically limited, either, In terms of equipment burden, it is preferable that it is low temperature, and that it is 20 degreeC-80 degreeC is preferable. However, you may heat above 80 degreeC as needed.

7 is an example of a lamination process of an electromagnetic wave shielding sheet and an adhesive optical filter using a laminator. The thing which wound the electromagnetic wave shielding sheet is arrange | positioned at the 1st paper feeding part 31 of a laminator, and the thing which wound the laminated sheet which consists of a release film / adhesive optical filter body is arrange | positioned at the 2nd paper feeding part 32. Subsequently, the electromagnetic wave shielding sheet is taken out from the first feed part 31, while the laminated sheet made of the release film / adhesive optical filter body is taken out from the second feed part 32, and wound up on the release film winding roll 34. The electromagnetic shielding sheet and the adhesive optical filter in the first laminate unit 35 at a laminate pressure of about 10 kgf / cm, and then in the second laminate unit 36 at about 10 kgf / cm. It is laminated by pressure, and wound up by the winding roll 37 to obtain a laminated sheet composed of an electromagnetic shielding sheet / adhesive layer / optical filter.

The composite filter for display manufactured by the manufacturing method including the above process is an electromagnetic wave shielding sheet, The height of the line part of the said mesh-shaped area | region is 3 micrometers or less, The opening width of the opening part of a mesh-shaped area | region is 150 micrometers or more In addition, an electromagnetic wave shielding sheet which does not have a planarization layer coating in the opening of the mesh-shaped region is used, and as the adhesive optical filter, it has a fluid adhesive layer at the time of adhesion and lamination, and the peel resistance is 5 to 30 N / 25. Since the adhesive optical filter of mm is used, the transparent filter of the mesh-shaped region as described above is unnecessary, and it is possible to reduce the extra material and the process, and the composite filter having excellent transparency can be produced with good production efficiency. You can get it.

The composite filter for display obtained by the manufacturing method which concerns on this invention can obtain a thing with high transparency, and it is preferable that haze is three or less specifically ,. Here, haze means the value measured by the method based on JISK7105-1981.

In addition, this invention is not limited to the said embodiment. As for the said embodiment, the thing of having substantially the same structure as the technical idea described in the claim of the present invention, and exhibiting the same effect is included in the technical scope of this invention.

EXAMPLE

Hereinafter, an Example is shown and this invention is demonstrated concretely. These descriptions do not limit the present invention. In addition, in an Example, a part shows a weight part unless there is particular notice.

<First Embodiment>

(1) Manufacture of electromagnetic shielding sheet

The electromagnetic wave shielding filter 1 shown to FIG. 1A and FIG. 2 was produced as follows.

As a transparent base material 11, the continuous strip | belt-colored transparent biaxially stretched polyethylene terephthalate film which provided the polyester resin primer layer in one side with thickness of 100 micrometers was prepared.

On the primer layer of this transparent base material, the nickel-chromium alloy layer of 0.1 micrometer in thickness and the copper layer (part of a conductor layer) of 0.2 micrometer in thickness were provided as the electrically conductive process layer 13 by the sputtering method.

A copper metal plating layer 14 (the remaining part of the conductive layer) having a thickness of 2.0 µm was formed on the surface of the conductive treatment layer by an electrolytic plating method using a copper sulfate bath, and the amount of the conductive treatment layer 13 and the metal plating layer 14 was increased. The layer was formed as the conductor layer 12, and the copper cladding laminated sheet which directly formed the conductor layer on the transparent base material without interposing the adhesive bond layer was produced.

Then, blackening layer 15B was formed on the said conductor layer. Specifically, a laminate sheet in which a mesh-like conductor layer is formed on a transparent substrate in a blackening treatment plating bath comprising a nickel plate as an anode and a mixed aqueous solution of an aqueous nickel ammonium sulfate solution, an aqueous zinc sulfate solution, and an aqueous sodium thiocyanate solution. Is immersed in electrolytic plating to perform blackening, and the blackening layer 15B made of nickel-zinc alloy is coated on the exposed entire surface of the conductor layer to form the conductor layer 12 (the conductive layer 13 and the metal plating layer). (14) and blackening layer 15A] were obtained.

Next, the conductive layer is etched with respect to the laminated sheet using a photolithography method, and a frame shape is formed at an outer edge surrounding the periphery of the mesh region consisting of the opening 103 and the line portion 104 and the mesh region. The grounding region of was formed.

Specifically, the etching was consistently performed from masking to etching on the laminated sheet having a continuous strip shape by using a production line for color TV shadow masks. That is, after applying a photosensitive etching resist to the whole surface of the conductor layer surface of the said laminated sheet, a desired mesh pattern is exposed and exposed, image development, film-processing, and baking are carried out, and a resist layer remains on the area | region corresponded to the line part of a mesh. After processing the resist layer in a pattern without a resist layer on the area corresponding to the opening, the conductive layer and the blackening layer are etched away with an aqueous ferric chloride solution to form a mesh-shaped opening, followed by water washing and resist stripping. , Washing and drying were performed sequentially.

When the mesh shape of the mesh area is square and the non-opening line portion has a line width of 10 μm, its line spacing (pitch) is 300 μm, the line portion is 2.3 μm, and is cut into a rectangular sheet. The bias angle defined as the thermal angle with respect to the long side of the rectangle was 49 degrees. In addition, when the mesh-shaped area 101 is equipped with the completed composite filter on the image display device (display) front face 12, there is a portion that faces the image display area of the display, and the mesh-shaped area 101 In the peripheral part, when the composite filter was cut into a rectangular sheet, it was designed in a pattern that left a frame part having a width of 15 µm without an opening as an area for grounding on the outer periphery of its four sides. Thus, the electromagnetic wave shielding sheet 1 of the 1st Example which does not have a planarization layer was obtained.

(2) Fabrication of cut sheet adhesive optical filter

Then, the cut adhesive optical filter 20 which should be laminated | stacked on the said electromagnetic wave shielding sheet 1 was prepared. As a layer structure of an optical filter, the thing of the structure of the antireflection layer / ultraviolet absorbing layer / adhesive layer 22 (adhesive layer 22 combined a near infrared absorption layer and a neon light absorption layer) was prepared. In addition, "/" shows that the left and right layers are laminated integrally.

As the ultraviolet absorbing layer, a Tetron film (made by Teijin (trade name "HB type"), which is a biaxially stretched PET film having a transparent thickness of 50 µm formed by mixing an ultraviolet absorber) was used. Moreover, the said ultraviolet absorber layer is used also as a base material for coating-forming an antireflection layer.

The anti-reflection layer was formed by sequentially forming a high refractive index layer and a low refractive index layer on the ultraviolet absorbing layer.

Here, the high refractive index layer is composed of a cured product layer having a thickness of 3 μm and a refractive index of 1.69 of a composition (JSR (manufactured by JSR, trade name “KZ7973”)) wherein the zirconia ultrafine particles are dispersed in an ultraviolet curable resin.

The low refractive index resin layer is made of a cured product having a thickness of 100 nm and a refractive index of 1.41 of a fluororesin-based ultraviolet curable resin (manufactured by JSR (trade name), trade name "TM086").

In addition, the adhesive layer 22 is formed on the side opposite to the antireflection layer of the ultraviolet absorber layer, and the adhesive layer is combined with the near infrared absorbing layer and the neon light absorbing layer by adding a near infrared absorber and a neon light absorbing agent to the adhesive layer 22. It was.

Cyanine-based pigment (manufactured by Asahi Denka Kogyo Co., Ltd., trade name "TY-167") as a neon light absorber, and a dimonium-based pigment (manufactured by Nippon Carrito, trade name "CIR1085") as a near infrared absorber, and phthalocyanine-based dye ( Nippon Shokubai Co., Ltd. brand name "IR12" and phthalocyanine type pigment | dye (The Nippon Shokubai Co., Ltd. brand name "IR14") were added.

As the adhesive, an acrylic resin-based adhesive (manufacturer; manufactured by Tomogawa Chemical, trade name; "TU-41A", peel resistance value; 10 N / 25 mm) was used.

The optical filter 20 having the above-described configuration has the same shape as the portion (rectangular) that opposes the image display area of the mesh-like area of the electromagnetic shielding sheet, and the dimensions are cut out by 4 mm in both the horizontal and vertical directions. It was set as the cut sheet adhesive optical filter.

(3) Preparation of Composite Filter

And the said electromagnetic wave shielding sheet 1 and the said sheet | seat adhesive optical filter 20 were obtained in the orientation which the said adhesive bond layer 22 opposes the said mesh-shaped area | region of the conductor layer 12, and the said sheet | seat is cut The adhesive optical filter covers all of the portions facing the image display area of the mesh-shaped area, and further, the inner circumferential side 2 mm of the grounding area is covered with the sheet-shaped adhesive optical filter, while The outer circumference side 13 mm was not covered with each other and after being positioned so that the conductor layer was exposed, they were adhesively laminated with each other. As lamination conditions at this time, it laminated | stacked by pressing at the linear pressure of up to 10 kg / cm with a rubber roller at room temperature (20 degreeC). Thus, the composite filter of the first embodiment was produced.

Second Embodiment

In the composite filter of the first embodiment, the adhesive is an acrylic resin-based adhesive [manufacturer; Nitto Denko (trade name), brand name; "No. 591", peeling resistance value; 7 N / 25 mm]. Otherwise, the composite filter of the second embodiment was produced in the same manner as in the first embodiment.

Third Embodiment

In the composite filter of the first embodiment, the adhesive is an acrylic resin-based adhesive [manufacturer; Nitto Denko (trade name), brand name; "CS-9621", peeling resistance value; 25 N / 25 mm]. Otherwise, the composite filter of the third example was manufactured in the same manner as the first example.

<First Comparative Example>

In the composite filter of the first embodiment, the adhesive is an acrylic resin-based adhesive [manufacturer; Nitto Denko (trade name); brand name: "HJ-9150W", Peeling resistance value; 35 N / 25 mm]. Others were carried out similarly to the 1st Example, and manufactured the composite filter of a 1st comparative example.

<2nd comparative example>

In the composite filter of the first embodiment, the adhesive is an acrylic resin-based adhesive (manufacturer; manufactured by Nippon Gosei Co., Ltd., trade name; "cofonyl N-2031 / hardener L-55 100: 3", peeling resistance value: 3 N / 25 mm ). Otherwise, the composite filter of the second comparative example was produced in the same manner as in the first example.

Third Comparative Example

In the composite filter of the first embodiment, the thickness of the conductor layer was changed to 10 mu m as follows. In addition, the adhesive agent was changed into the same thing as a 2nd comparative example. Otherwise, the composite filter of the fourth comparative example was manufactured in the same manner as in the first example.

(1) Manufacture of electromagnetic shielding sheet

The electromagnetic wave shield filter 1 shown in FIG. 1 was produced as follows. First, as a metal foil used as the conductor layer 12, a continuous band-shaped electrolytic copper foil having a thickness of 10 µm having a blackening layer 15A made of copper-cobalt alloy particles formed on one surface thereof was prepared.

Moreover, as a transparent base material 11, the continuous strip | belt-colored transparent biaxially stretched polyethylene terephthalate film which provided the polyester resin primer layer in one side with thickness of 100 micrometers was prepared.

And after zinc plating on both surfaces of the said copper foil, well-known chromate treatment was performed by the dipping method, and the antirust layer 16A, 16B was formed in the back surface and both surfaces.

Subsequently, this copper foil was used as the mass part of the polyester polyurethane polyol (12) whose average molecular weight is 30,000 on the said transparent base material primer layer on the blackening layer surface side, and a hardening | curing agent is a xylene diisocyanate type prepolymer 1 After dry lamination with a transparent two-component curable urethane resin adhesive composed of parts by mass, curing was performed for 3 days at 50 ° C. to form a continuous strip-shaped copper clad laminated sheet having a transparent adhesive layer having a thickness of 7 μm between the copper foil (rust-preventing layer) and the transparent substrate. Got it.

Next, with respect to the copper clad laminated sheet, the conductor layer and the blackening layer surround the four regions of the mesh-shaped region and the mesh-shaped region formed of the opening 103 and the line portion 104 by etching using the photolithography method. A frame-shaped grounding region was formed in the outer edge.

The etching process is the same as in the first embodiment. The height of the line portion of the mesh-shaped region is 10 µm, but the shape and dimensions of the other mesh-shaped region are the same as in the first embodiment.

Thus, the electromagnetic wave shielding sheet 1 of the 3rd comparative example without a planarization layer was obtained.

(Manufacture of cut sheet adhesive optical filter)

In the same manner as in Comparative Example 2, a cut adhesive optical filter was obtained.

(Manufacture of Compound Filter)

Then, in the same manner as in the first embodiment, the cut adhesive optical filter was adhered and laminated on the mesh upper region of the obtained electromagnetic wave shielding sheet 1.

In this way, the composite filter of the third comparative example was obtained.

<4th comparative example>

In the composite filter of the first comparative example, one in which a flattening layer was formed on a mesh-like region was used as the electromagnetic shielding sheet as follows. Otherwise, the composite filter of the fourth comparative example was obtained in the same manner as the first comparative example.

(1) Manufacture of electromagnetic shielding sheet

In the same manner as in Comparative Example 1, an electromagnetic shielding sheet without a flattening layer was obtained.

Then, the said electromagnetic wave shielding sheet wound up by the roll once was wound up, and the planarization layer was formed on the mesh surface. The formation method of a planarization layer is as follows.

First, the coating liquid which consists of a transparent ionizing radiation curable resin composition is coated by the intermittent coating by the intermittent die-coat method to the position which entered 2.5 mm toward the whole inner periphery of the frame part which continues to both sides in the width direction, and the frame part before and behind a flow direction. 25 g / m 2 was applied on the mesh-shaped area of the electromagnetic wave shielding sheet in a dry coating amount so that the outside thereof was not coated, and the opening of the mesh was completely filled to flatten the surface of the coated surface.

The coating solution is a mixture of a urethane acrylate oligomer and a phenoxyethyl acrylate monomer in a 1: 1 mass ratio, and a photoinitiator [Irgacure (registered trademark) 184, manufactured by Chiba Specialty Chemicals Co., Ltd.] Mass% is added and it is a coating liquid which consists of an ionizing radiation curable resin composition which diluted again with the organic solvent (methyl ethyl ketone: toluene = 1: 1 mass ratio mixed solvent).

And after the said application | coating, as a shaping | molding sheet which shape | molds a flat surface with respect to the coating film after scattering a dry solvent, the commercially available biaxially-stretched polyethylene terephthalate film of 50 micrometers of continuous strip | belt-shaped is unadhesive-treated. The surface [surface roughness was laminated on the coating film with the centerline average roughness of JIS B0601 (1994 edition) prescribed | regulated. Thereafter, the coating film was cured by ultraviolet irradiation (using D valve manufactured by Fusion UV System Co., Ltd.) from the shaping sheet side, and only the shaping sheet was peeled off to form a flattening layer having a flat surface.

Thus, the electromagnetic wave shielding sheet 1 with a planarization layer was obtained.

(2) Fabrication of cut sheet adhesive optical filter

In the same manner as in Comparative Example 1, a cut adhesive optical filter was obtained.

(3) Preparation of Composite Filter

And the sheet | seat adhesive optical filter was adhere | attached and laminated | stacked similarly to the 1st comparative example on the planarization layer of the said electromagnetic wave shielding sheet 1 which was obtained.

In this way, the composite filter of the fourth comparative example was obtained.

<Fifth Comparative Example>

In the composite filter of the third comparative example, as the electromagnetic shielding sheet, one having a flattening layer formed on the mesh region as described below was used. Otherwise, the composite filter of the fifth comparative example was obtained in the same manner as in the third comparative example.

(1) Manufacture of electromagnetic shielding sheet

In the same manner as in Comparative Example 3, an electromagnetic wave shielding sheet without a flattening layer was obtained.

Next, the said electromagnetic wave shielding sheet wound up by the roll once was wound up, and the planarization layer was formed on the mesh surface.

First, the coating liquid which consists of a transparent ionizing radiation curable resin composition is coated by the intermittent coating by the intermittent die-coat method to the position which entered 2.5 mm toward the whole inner periphery of the frame part which continues to both sides in the width direction, and the frame part before and behind a flow direction. 25 g / m 2 was applied on the mesh-shaped area of the electromagnetic wave shielding sheet in a dry coating amount so that the outside thereof was not coated, and the openings of the mesh were completely filled to flatten the coated surface.

The coating solution is a mixture of a urethane acrylate oligomer and a phenoxyethyl acrylate monomer in a 1: 1 mass ratio, and a photoinitiator [Irgacure (registered trademark) 184, manufactured by Chiba Specialty Chemicals Co., Ltd.] Mass% is added and it is a coating liquid which consists of an ionizing radiation curable resin composition which diluted again with the organic solvent (methyl ethyl ketone: toluene = 1: 1 mass ratio mixed solvent).

Then, after the coating, a commercially available biaxially stretched polyethylene terephthalate film having a continuous band shape of 50 µm in thickness as a shaping sheet for shaping the flat surface with respect to the coating film after the dry solvent is scattered on the non-adhesive treated surface [surface Roughness was laminated on the coating film with the centerline average roughness of JIS B0601 (1994 version) prescribed | regulated. Thereafter, the coating film was cured by ultraviolet irradiation (using D bulb manufactured by Fusion UV System Co., Ltd.) from the shaping sheet side, and only the shaping sheet was peeled off to form a flattening layer having a flat surface.

By the above, the electromagnetic wave shielding sheet 1 which has a planarization layer was obtained.

(2) Fabrication of cut sheet adhesive optical filter

In the same manner as in Comparative Example 3, a cut adhesive optical filter was obtained.

(3) Preparation of Composite Filter

And the sheet | seat adhesive optical filter was adhered and laminated on the planarization layer of the said electromagnetic wave shielding sheet 1 similarly to 3rd comparative example.

In this way, the composite filter of the fifth comparative example was obtained.

Sixth Comparative Example

(3) The lamination conditions in the manufacture of the composite filter of the first comparative example were heated and pressed by sucking with a vacuum pump and pressing with a silicon rubber film heated to 60 ° C from the cut adhesive optical filter side. Lamination (so-called autoclave processing) was carried out. Otherwise, the composite filter of the sixth comparative example was obtained in the same manner as the first comparative example.

<7th comparative example>

(3) The lamination conditions in the manufacture of the composite filter of the third comparative example were aspirated by using a vacuum pump and pressed by a silicon rubber film heated at 60 ° C from the cut adhesive optical filter side to a heated pressurized state. Lamination (so-called autoclave processing) was carried out. Otherwise, the composite filter of the seventh comparative example was obtained in the same manner as in the third comparative example.

[Performance Evaluation Method]

The following points were evaluated about each Example and the comparative example. The evaluation results are shown in Table 1.

(1) transparency of the area on the mesh

Composite filters were visually compared and compared.

Cloudiness or the presence of bubbles is not recognized; ○

Cloudiness or the presence of bubbles is recognized; △

Cloudiness or the presence of bubbles is recognized, and particularly noticeable; ×

Table 1

Height of mesh shape area (μm)  Transparent layer Peel Resistance of Adhesive Layer (N / 25 mm) Autoclave treatment at the time of lamination Evaluation results Transparency of Mesh Geometry Regions Peeling after heat humidification First embodiment 2.3 radish 10 radish ○ ○ Second embodiment 2.3 radish 7 radish ○ ○ Third embodiment 2.3 radish 25 radish ○ ○ Comparative Example 1 2.3 radish 35 radish × ○ 2nd comparative example 2.3 radish 3 radish ○ × Third Comparative Example 10 radish 3 radish × × Fourth Comparative Example 2.3 U 35 radish ○ ○ 5th comparative example 10 U 3 radish ○ × 6th comparative example 2.3 radish 35 U ○ ○ 7th Comparative Example 10 radish 3 U ○ ×

<Organize Results>

The following is understood from the above Example and a comparative example.

In order to obtain an effective electromagnetic shielding effect, when the optical filter is bonded to the mesh-shaped region of the electromagnetic shielding sheet via the adhesive layer on the back side thereof, the adhesive layer is used as an adhesive and the peeling resistance is 30 N / 25 mm or less. Even if a transparent layer is formed in a mesh region having a required height of 1 to 3 µm, or there is no autoclave treatment at the time of lamination, there is no bubble remaining in the opening, and the transparency of the composite filter is good.

On the other hand, when peeling resistance value is more than 30 N / 25 mm, the transparency fall by bubble residual | occur | produced in the composite filter without a transparent layer or without autoclave treatment arises.

However, when peeling resistance value is less than 5 N / 25 mm, peeling of an optical filter cannot be generated this time after heat-humidification.

Therefore, it turns out that the peeling resistance value of an adhesive bond layer is a suitable range from the point of compatibility with the bubble prevention prevention of a bubble residual, and the prevention of the peeling of an optical filter after heat-humidification.

In addition, when the height of the mesh-shaped region is 1 to 3 µm, by selecting an adhesive having a peel resistance of 30 N / 25 mm or less as an adhesive, a bubble layer is formed in the opening even when a transparent layer is formed or an autoclave treatment is not performed at the time of lamination. There is no transparency of the composite filter.

As mentioned above, it turns out that the range whose height of a mesh-shaped area | region is 1-3 micrometers is a suitable range from the point of compatibility with the bubble residual prevention and the optical filter peeling prevention after a heating humidification.

In addition, even when the height of a mesh-shaped area | region is more than 3 micrometers, or when the peeling resistance value of an adhesive layer is more than 30 N / 25 mm, a bubble to a mesh is formed by forming a transparent layer or performing an autoclave process at the time of lamination | stacking. Residue can be prevented. However, in these cases it is recognized that they are not suitable because they require extra material, layer thickness and / or process.

According to the manufacturing method of the composite filter for a display of this invention, even if the burden of a facility or extra material is reduced in a short process, the omission of a conventional transparent process to a mesh surface can be prevented, and since bubble mixing can be prevented, high transparency A composite filter can be obtained with a good yield and inexpensive. Moreover, according to the manufacturing method of the composite filter for a display of this invention, the autoclave process with respect to the obtained composite filter is also unnecessary.

Claims (1)

(A) An electromagnetic wave shielding sheet formed by stacking at least a conductor layer having a mesh-shaped region capable of covering all of the image display regions of a display applied to one side of the transparent substrate, wherein the height of the line portion of the mesh-shaped region is 3 μm or less. A step of preparing an electromagnetic wave shielding sheet having an opening width of an opening of the mesh-shaped region of 150 µm or more and without covering of the planarization layer in the opening of the mesh-shaped region; (B) The electromagnetic wave shielding is performed on the adhesive layer side of the adhesive optical filter which is formed by laminating an adhesive layer on one side, the adhesive layer having fluidity at the time of adhesion and lamination, and having a peeling resistance of 5 to 30 N / 25 mm. The manufacturing method of the composite filter for displays which consists of a laminated body of an electromagnetic wave shielding sheet and an optical filter which have the process of laminating | stacking toward the conductor layer side of a sheet | seat.

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