JP2013214059A - Anti-glare coating - Google Patents

Abstract

【Task】
The present invention relates to an antiglare coating that is excellent in wear resistance, can display a clear image, and can suppress glare in an image.
[Solution]
An antiglare layer having a plurality of separated regions, wherein the region and the base material are formed in an uneven shape, and the surface in the protruded region is smooth or at least one uneven portion is formed An antiglare coat is prepared.
[Selection figure] None

Description

The present invention relates to an antiglare coat and a method for producing the same, and more particularly to an antiglare coat having excellent wear resistance and reduced glare and a method for producing the same.

In recent years, in image input bodies such as liquid crystal displays (LCD), plasma displays (PDP), CRT, EL, etc., and coordinate input devices such as touch panel, coordinate input panels such as tablets, etc. Due to refinement and the like, an antiglare coat that scatters reflected light is required as an antireflection function for improving visibility.
In particular, coordinate input devices such as touch panel using transparent electrodes, coordinate input panels for tablets, etc. are operated by directly touching with a plastic pen or finger, so the surface of the coordinate input device is resistant to abrasion, chemicals and dirt. The demand for is increasing. In addition, when using these devices in a relatively bright place, including outdoors, it is possible to prevent sunlight and external light such as fluorescent light from being reflected on the display, that is, coordinate input with anti-glare properties. There is also a strong demand for panels. These demands are now spreading to various coordinate input devices ranging from small to large.
As an antiglare coat, it is generally known that a layer in which particles such as silica are dispersed in a binder component is used for the antiglare coat.
JP-A-8-12902 (Patent Document 1) or JP-A-11-287902 (Patent Document 2) discloses an antiglare layer in which fillers and particles are dispersed. Furthermore, Japanese Patent Application Laid-Open No. 2007-187746 (Patent Document 3) discloses an antiglare film in which a plurality of irregularities are formed by utilizing phase separation of a polymer.
However, these antiglare layers form an uneven shape on the surface by adding fillers, particles such as silicon oxide or curable resins as components that diffusely reflect light in order to obtain antiglare properties. The filler, particles of silicon oxide or the like or curable resin are scraped by friction due to direct contact with the filler, or the filler, particles of silicon oxide or the curable resin are detached from the binder component, and durability cannot be obtained. This is due to the hardness of the filler added to obtain an antiglare effect, particles such as silicon oxide or curable resin, the hardness when the binder component is cured, or the adhesion between the added component and the binder component (adhesive strength) ) Greatly affects.
Further, depending on the position, size, shape, and size of the surface irregular shape used for the antiglare layer, unevenness occurs in the magnitude of pixel distortion due to the irregular lens effect. As a result, even if the antiglare effect is obtained, the image is glazed and the image quality is significantly impaired.

JP-A-8-12902 JP 11-287902 A JP 2007-187746 A

The present invention provides an antiglare coating that can suppress reflection on an image display body and a coordinate input device and glare of an image, display a clear image, and has high wear resistance, and a method for manufacturing the same. For the purpose.

The present invention is an antiglare coat provided with an antiglare layer having a plurality of regions separated on a substrate, wherein the region and the substrate are formed in an uneven shape, and the surface in the convex region is The antiglare coat having a smooth or at least one concavo-convex portion is a first gist, and the convex shape has at least one edge in a plateau shape or a substantially circular basin shape. The antiglare coat is the second gist, and the total light transmittance is 80 to 100%, the haze is 1 to 10%, and the measurement is performed with an image clarity measuring instrument using an optical comb having a width of 0.5 mm. The image clarity is 50 to 85%, and the antiglare coat according to claim 1 and 2 is a third gist, and there is an interval between the convex portions having a plurality of regions, and a part of the lower layer has the interval. The antiglare coat according to claim 1 or 2, wherein the antiglare coat is exposed from the space. To.

In the present invention, since the size (range) of a portion having a specific surface concavo-convex structure and in close contact with the base material of the convex portion is 50 to 250 μm, reflection on an image display body, a coordinate input panel, The glare of the image can be suppressed and a clear image can be displayed. Furthermore, since the surface in the convex region is smooth or at least one uneven portion is formed, an antiglare coat having high wear resistance can be produced. In addition, in the antiglare coating of the present invention, when the surface of the substrate is exposed by slightly opening the surface uneven structure, when used for a surface capacitive touch panel, etc., the coordinate input surface (conductive film side) A part is exposed, and a resistive surrounding electrode can be formed after the antiglare coating is formed. When a resistive ambient electrode that needs to be formed at a high temperature is used by performing a resistive ambient electrode formation process after this anti-glare coating coating process, after the resistive ambient electrode is formed, the resistive ambient electrode is cured. Next, after the antiglare coat coating and drying, the baking for curing the antiglare coat film and the baking process that was required twice can be performed in one baking process.

Cross-sectional view of the antiglare coat of the present invention (plateau) Cross-sectional view of the antiglare coat of the present invention (a shape having at least one edge in a substantially circular basin type) Cross-sectional view of the antiglare coat of the present invention (mixed shape with at least one edge on plateau and substantially circular basin)

(Anti-glare coat)
In the antiglare coat of the present invention, an antiglare layer is formed on a substrate with a single type of coating film, and particles such as filler, silicon oxide, or curable resin are not added. This one kind of paint is to use one kind of paint in which either inorganic or organic paint is mixed or single at the time of coating. The mixed paint is a mixture of two or more kinds of inorganic and organic similar substances, or a mixture of inorganic and organic different kinds.
A low refractive index layer may be further coated on the antiglare coat.
Examples of inorganic coatings include organoalkoxysilane compound systems and alkoxy metal salt systems.
Organic paints include acrylic resins, vinyl acetate resins, styrene resins, polyester resins, vinyl ether resins, halogen-containing resins, ethoxy resins, polycarbonate resin fats, cyclic olefin resins, polyamide resins, Examples thereof include silicon resins and cellulose derivatives.
The anti-glare layer is formed by a method such as spraying, ink-jet method, screen method, dispenser method or the like using any one of the above-mentioned paints, and then fired to form.
(Base material)
As the substrate, a light-transmitting material, for example, soda glass can be used, but the material is not particularly limited, and a transparent ceramic material containing any glass, acrylic resin, polyethylene terephthalate Transparent resin material such as resin can be used. Depending on the application, an opaque insulating substrate may be used.
In the case of a coordinate input panel, it is necessary to coat the base material with a conductive thin film to form a transparent electrode. In general, tin oxide, tin oxide added with antimony (ATO), indium oxide, and tin are added as materials for the conductive thin film of the surface resistor 2 that covers the base material (not shown) of the transparent conductive film. Indium oxide (ITO), indium oxide added with zinc (IZO), zinc oxide, or the like is used. Examples of the coating method include a physical sputtering method, a vacuum deposition method, an ion plating method, a chemical spray method, a dipping method, and a chemical vapor deposition method (CVD method).
As the roughness of the antiglare coat surface, the center line average roughness (Ra) is 0.3 μm or less (preferably 0.02 to 0.2 μm), and the average peak interval (RSm) is 250 μm or less (preferably Is 50 to 200 μm), the reference length average maximum height (Ry) is 2 μm or less (preferably 0.1 to 1.0 μm), and the average inclination angle (RΔa) is 5 degrees or less (preferably 0). .5 to 2.0 degrees).
By reducing the surface roughness Ra of the antiglare coat surface to 0.3 μm or less, it is possible to give an appropriate coefficient of friction for sliding the point using a finger or the like on the antiglare coat, and appropriate operation A feeling can be obtained. However, if the surface roughness Ra is smaller than 0.01 μm, the friction coefficient of the glass surface becomes too large, and it becomes difficult for the finger or the like to slip.
In particular, the antiglare coat of the present invention is uneven. The size (range) (hereinafter referred to as the size of the convex portion) of the portion where the convex portion is in close contact with the base material is preferably 50 to 250 μm. This is because, as the resolution of the display improves, the height of the unevenness and the size of the protrusions on the roughened layer are required to be high, and the high definition of the image is mainly due to the high density of image dots. However, it is necessary to make the interval between the concaves and convexes smaller than the pitch of the image dots. Conversely, when the interval between the concaves and convexes is large, glare due to interference occurs. Therefore, the maximum value in the range setting of the size of the convex portion is set to 250 μm from about 250 μm which is one side of the image dot of the display currently on the market. On the other hand, the minimum value may be small as long as it is larger than 0.78 μm, which is considered to cause geometrical scattering of light, and the adhesive strength (adhesiveness) of the coating film is high. From the viewpoint of relationship and wear, the thickness was set to 50 μm. Moreover, since the height of the unevenness affects the reflection of light, the height of the convex portion is set to 0.01 to 2 μm.
Further, the inclination of the convex portion was set to 5 degrees or less in order to reduce the friction coefficient with the contact object.
Furthermore, the antiglare coat of the present invention has a convex portion on a plateau, the top has an indeterminate shape, a circle, or an ellipse, and the surface in the convex portion region is smooth or at least one uneven portion is formed. ing. If the surface in the convex region is smooth, the resistance to the contact object is small, so the wear resistance is high. On the other hand, the shape in which at least one uneven portion is formed on the surface in the convex region is, for example, a shape (crater shape) having at least one edge in a substantially circular basin shape.
These surface shapes may be single or mixed.
As an optical characteristic of the antiglare coat of the present invention, the total light transmittance is about 80 to 100% (preferably 80 to 98%).
If the total light transmittance is less than 80%, an image viewed through the anti-glare coating will appear dark or blurry, so 80% or more is necessary.
The haze is about 1 to 10% (preferably 1 to 6%).
When the haze is less than 1%, the antiglare property cannot be obtained. Moreover, when the haze exceeds 10%, the antiglare property becomes too strong, and coordinates such as an image display body such as a liquid crystal display (LCD), plasma display (PDP), CRT, EL, etc., a coordinate input panel such as a touch panel, a tablet, etc. If the surface of the input device or the like is covered, the display unit becomes difficult to see.
Further, the glossiness is about 90 to 145% (preferably 100 to 130%) at a measurement angle of 60 degrees.
The image clarity (transmission image) definition of the antiglare layer of the present invention is about 50 to 85% when an optical comb having a width of 0.5 mm is used.
The mapping (transmission image) definition is an index of how sharply and without distortion the image is projected when an object is projected through the substrate. Therefore, if the mapping (transmission image) definition is too high, the effect of preventing reflection is reduced. On the other hand, if the mapping (transmission image) definition is too small, the above-mentioned reflection can be prevented, but the definition of the image decreases.
(Production method of anti-glare coat)
The antiglare coat of the present invention is formed by using one kind of paint and drying or baking after forming an antiglare layer by a technique such as a spray method, an ink jet method, a screen method, or a dispenser method.
The present invention is an antiglare coating that can suppress reflection on an image display body or a coordinate input panel and glare of an image, can display a clear image, and has high wear resistance. It is particularly suitable for a coordinate input panel. Moreover, the use is not limited to the above products, but can also be applied to those requiring anti-glare properties such as glass and acrylic materials used outdoors.

Hereinafter, the present invention will be described with reference to examples and comparative examples. The present invention is not limited to the following examples, and includes various modifications within the technical scope of the present invention.
Example 1
A transparent electrode was used as a base material for coating the antiglare coat. The transparent electrode was prepared as follows. As a glass substrate, soda glass (thickness: 3.2 mm) cut into a size of about 100 × 100 mm is used, and an ITO (indium oxide added with tin) film is formed on the surface of the glass substrate by sputtering. To form a surface resistor.
An alkoxy metal salt-based paint (G-90, manufactured by Niita Laboratory Co., Ltd.) is applied to the ITO-formed surface of the transparent electrode by a spray method under the condition that the air pressure is 3 kgf / cm ² , and 150 ° C., 15 It dried on the conditions for minutes, and formed the coating film. The discharge amount and the coating distance were adjusted so that the size of the projections on the uneven surface during drying was measured at 10 points and averaged about 100 μm. The magnitude | size of the convex part was confirmed using the microscope (VH-7000 by Keyence Corporation). Further, the number of coatings was adjusted so that the haze value was about 2%.
(Example 2)
The coating material of Example 1 was changed to urethane resin (manufactured by Kansai Paint Co., Ltd., Super Diamond), applied by the spray method under the same conditions as Example 1, and dried at 120 ° C. for 20 minutes to form a coating film. The size of the protrusions on the uneven surface during drying was measured at 10 points, and the discharge amount and the coating distance were adjusted so that the average was about 100 μm. The magnitude | size of the convex part was confirmed using the microscope (VH-7000 by Keyence Corporation).
(Example 3)
In the coating material of Example 1, instead of silicon-acrylic resin (DIC Co., Ltd., ACRICID A-9510), coating was performed by the spray method under the same conditions as in Example 1, and dried at 150 ° C. for 30 minutes to form a coating film did. The discharge amount and the coating distance were adjusted so that the size of the projections on the uneven surface during drying was measured at 10 points and averaged about 100 μm. The magnitude | size of the convex part was confirmed using the microscope (VH-7000 by Keyence Corporation).
Example 4
Under the conditions of Example 1, the size of the protrusions was measured at 10 points and adjusted to an average of about 50 μm.
(Example 5)
Under the conditions of Example 1, the size of the convex portion was measured at 10 points and adjusted to an average of about 250 μm.
(Example 6)
Under the conditions of Example 1, the size of the convex portion was measured at 10 points and adjusted to an average of about 100 μm. The number of coatings was adjusted so that the haze value was about 10%.
(Example 7)
The same ITO-formed surface used in Example 1 was screen-printed with an epoxy-based two-component thermosetting paint (manufactured by Seiko Advance Co., Ltd., 1690N) using a screen pattern having a diameter of 90 μm and a pitch width of 200 μm. Baked at 150 ° C. for 30 minutes to form a coating film. The size of the convex portion was measured at 10 points using a microscope (VH-7000, manufactured by Keyence Corporation), and it was confirmed that the average was about 100 μm.
(Comparative Example 1)
Under the conditions of Example 1, the size of the protrusions was measured at 10 points and adjusted to an average of about 30 μm.
(Comparative Example 2)
Under the conditions of Example 1, the size of the protrusions was measured at 10 points and adjusted to an average of about 300 μm.
(Comparative Example 3)
Under the conditions of Example 1, the number of coatings was adjusted so that the haze value was about 15%.
(Comparative Example 4)
Under the conditions of Example 1, the number of coatings was adjusted so that the haze value was about 20%.
(Comparative Example 5)
Under the conditions of Example 2, the size of the convex portion was measured at 10 points and adjusted to an average of about 30 μm.
(Comparative Example 6)
Under the conditions of Example 2, the size of the convex portion was measured at 10 points and adjusted to an average of about 300 μm.
(Comparative Example 7)
Under the conditions of Example 3, the size of the convex portion was measured at 10 points and adjusted to an average of about 30 μm.
(Comparative Example 8)
Under the conditions of Example 3, the size of the convex portion was measured at 10 points and adjusted to an average of about 300 μm.
The performance of the antiglare coats obtained in Examples 1 to 7 and Comparative Examples 1 to 8 was confirmed with respect to abrasion resistance test, transmittance, haze, image (transmission image) definition, glare, and antiglare properties. .
In the abrasion resistance test, steel wool (# 0000) was attached to a circular pad having a diameter of 20 mm, and a sample surface was scratched at a fixed number of times with a stroke width of 30 mm and a speed of 30 mm / sec while applying a 1 kg load. Examples 1, 4, 5, and 6 and Comparative Examples 1, 2, 3, and 4 were confirmed every 100 times, and Examples 2, 3, 7, and Comparatives 5 to 8 were confirmed every 5 times.
The transmittance and haze were measured using a haze meter (NDH-5000, manufactured by Nippon Denshoku Industries Co., Ltd.).
The clarity of the image (transmission image) was measured with an optical comb of 0.5 mm using a image clarity measuring device (ICM-1T manufactured by Suga Test Instruments Co., Ltd.).
The glare was placed on a liquid crystal (Samsung LTM190E4-L02), green (R: 0, G: 153, B: 68) was projected and visually evaluated.
The anti-glare property was evaluated by visual observation of a fluorescent lamp with an overhead of 1.5 m from an angle of 45 degrees.

表１の結果より実施例１〜７は、耐摩耗性が高いことが確認された。実施例１、４、５、６及び比較例１〜４と実施例２、３、７及び比較例５〜８で耐摩耗試験の回数が大きく異なるのは、無機系塗料と有機系塗料の成膜時の硬度が無機系塗料の方が高いためである。
一方、比較例１は、実施例１、４、５、６と比較して耐摩耗性が低く、同様に比較例５、７は、実施例２、３と比較して耐摩耗性が低かった。さらに、比較例３、４は、写像鮮明度が、実施例１〜７より低かった。

From the results in Table 1, it was confirmed that Examples 1 to 7 had high wear resistance. In Examples 1, 4, 5, and 6 and Comparative Examples 1 to 4, and in Examples 2, 3, 7 and Comparative Examples 5 to 8, the number of wear resistance tests differs greatly between the inorganic paint and the organic paint. This is because the hardness of the film is higher in the inorganic paint.
On the other hand, Comparative Example 1 had low wear resistance compared to Examples 1, 4, 5, and 6, and similarly Comparative Examples 5 and 7 had low wear resistance compared to Examples 2 and 3. . Further, Comparative Examples 3 and 4 had a lower mapping definition than Examples 1-7.

表２の結果より実施例１〜７は、ぎらつきも少なく、蛍光灯の写りがにじむことより防眩性が得られていた。
一方、比較例２、６、８は、ぎらつきがあった。さらに、比較例1、５、７は、蛍光灯がにじむが、実施例１〜７と比較すると防眩性が微小に低いことが確認された。
（実施例８）
防眩コートを被覆する基材は透明電極を用いた。透明電極は、次のようにして作成した。ガラス基材として、ソーダガラス（厚さ３．８ミリ）を略３６９×３０３ｍｍの大きさに切断したものを用い、ガラス基材の表面に、スパッタ法によってＩＴＯ（錫を添加した酸化インジウム）膜を形成して面抵抗体とした。
前記透明電極のＩＴＯ形成面にアルコキシ金属塩系塗料（（株）日板研究所製、Ｇ−９０）を、スプレー法にてエアー圧が３ｋｇｆ／ｃｍ²の条件で塗布し、１５０℃、１５分間の条件で乾燥し、塗膜を形成した。乾燥時凹凸面の凸部の大きさが１０点測定し平均約１００μｍになるように吐出量、塗装距離を調整した。凸部の大きさは、マイクロスコープ（(株)キーエンス製ＶＨ−７０００）を用いて確認した。また、ヘイズ値が、約２％になるように塗装回数を調整した。
上記基材を用い、抵抗性周囲電極を（株）アサヒ化学研究所製銀ペーストＬＳ−５０４（樹脂バインダー）でスクリーン印刷し、加熱硬化させることで形成した。次に、抵抗性周囲電極の四隅に配線を施し、座標入力パネルとした。
（実施例９）
実施例８の条件で、凸部の大きさを１０点測定し平均約５０μｍになるように調整した以外は同条件で座標入力パネルとした。
（実施例１０）
実施例８の条件で、凸部の大きさを１０点測定し平均約２５０μｍになるように調整した以外は同条件で座標入力パネルとした。
実施例８〜１０の座標入力パネルを座標検出用基板に接続し、出力される座標データを、シリアル通信によってパソコンに取り込むようにした。この構成で座標入力パネルを評価した。その結果、座標を読み取ることができた。これより、本発明の防眩コートにおいて、表面凹凸構造の間隔を微小に開け基材表面を露出したことで、座標入力表面（導電膜側）が露出し、防眩コート被覆後に、抵抗性周囲電極を形成しても座標入力表面と抵抗性周囲電極が電気的に接触し座標を読み取ることができた。また、前記と同じ耐摩耗試験を実施したところ、摩耗回数７００回と実施例１、４、５、６と同等であった。

From the result of Table 2, Examples 1-7 had little glare, and the glare-proof property was acquired from the reflection of a fluorescent lamp blurring.
On the other hand, Comparative Examples 2, 6, and 8 had glare. Further, in Comparative Examples 1, 5, and 7, the fluorescent lamp bleeds, but it was confirmed that the antiglare property was slightly lower than those in Examples 1 to 7.
(Example 8)
A transparent electrode was used as a base material for coating the antiglare coat. The transparent electrode was prepared as follows. As a glass substrate, soda glass (thickness 3.8 mm) cut into a size of about 369 × 303 mm is used, and an ITO (indium oxide added tin) film is formed on the surface of the glass substrate by sputtering. To form a surface resistor.
An alkoxy metal salt-based paint (G-90, manufactured by Niita Laboratory Co., Ltd.) is applied to the ITO-formed surface of the transparent electrode by a spray method under the condition that the air pressure is 3 kgf / cm ² , and 150 ° C., 15 It dried on the conditions for minutes, and formed the coating film. The discharge amount and the coating distance were adjusted so that the size of the projections on the uneven surface during drying was measured at 10 points and averaged about 100 μm. The magnitude | size of the convex part was confirmed using the microscope (VH-7000 by Keyence Corporation). Further, the number of coatings was adjusted so that the haze value was about 2%.
A resistive surrounding electrode was formed by screen-printing with a silver paste LS-504 (resin binder) manufactured by Asahi Chemical Research Co., Ltd. and heat-curing using the substrate. Next, wiring was given to the four corners of a resistive surrounding electrode, and it was set as the coordinate input panel.
Example 9
A coordinate input panel was obtained under the same conditions as in Example 8 except that the size of the protrusions was measured at 10 points and adjusted to an average of about 50 μm.
(Example 10)
A coordinate input panel was obtained under the same conditions as in Example 8 except that the size of the protrusions was measured at 10 points and adjusted to an average of about 250 μm.
The coordinate input panels of Examples 8 to 10 were connected to the coordinate detection substrate, and the output coordinate data was taken into a personal computer by serial communication. The coordinate input panel was evaluated with this configuration. As a result, the coordinates could be read. Thus, in the antiglare coating of the present invention, the coordinate input surface (conductive film side) is exposed because the surface of the base material is exposed by slightly opening the surface uneven structure, and after coating the antiglare coating, the resistance surroundings Even when the electrodes were formed, the coordinate input surface and the resistive surrounding electrode were in electrical contact and the coordinates could be read. Further, when the same wear resistance test as described above was performed, the number of wear was 700 times, which was the same as in Examples 1, 4, 5, and 6.

DESCRIPTION OF SYMBOLS 1 Base material 2 Surface resistor 3 Anti-glare coating

Claims (4)

An anti-glare coating comprising an anti-glare layer having a plurality of regions separated on a substrate, wherein the region and the substrate are formed in an uneven shape, and the surface in the convex region is smooth or at least An anti-glare coat, wherein one or more uneven portions are formed. The antiglare coat according to claim 1, wherein the convex shape is a plateau shape or a shape having at least one edge in a substantially circular basin shape. The total light transmittance is 80 to 100%, the haze is 1 to 10%, and the image clarity measured by an image clarity measuring instrument using an optical comb having a width of 0.5 mm is 50 to 85%. The antiglare coat according to claim 1. The antiglare coat according to claim 1 or 2, wherein there is an interval between the convex portions having a plurality of regions, and a part of the lower layer is exposed from between the intervals.

Images