JPH11335639A - Sticking film for electronic display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sticking film capable of easily regulating light transmittance, color tone, and the reflection of fluorescent lamp (s) or sunlight as well, by providing one side of a base material with a colorant-contg. tack agent layer. SOLUTION: This sticking film is obtained by providing one side of a transparent base material (pref. polyethylene terephthalate, triacetyl cellulose or the like) with a carbon black-dispersed tack agent (pref. an acrylic tack agent) which may be formulated with an organic pigment, as appropriate); optionally, one side or both sides of the base material is provided with reflection-proofing layer(s) against externally incident light, and the base material is preferably subjected to surface modification treatment as well. Thereby, when this film is stuck on the outside of a glass body as an image display, the light transmittance and color tone of the glass body coming from a light source for color development can be easily regulated at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an adhesive film for electronic displays such as CRTs and liquid crystals. More specifically, the present invention relates to an adhesive film for an electronic display that adjusts the amount of transmitted light from a light source and scattering of the transmitted light, and suppresses reflection and reflection of a fluorescent lamp or sunlight on a display device screen.

[0002]

2. Description of the Related Art Conventionally, a glass body which is a screen of a display device such as a plasma display or a television cathode ray tube contains a coloring agent such as carbon black. The coloring agent is included to adjust the amount of transmitted light from the light source. For example, in a cathode ray tube provided with a phosphor that emits color by electron beam irradiation, white is formed by mixing three colors of red, green, and blue, and black is formed by a non-colored portion. For this reason, it has the characteristic that the whiteness becomes strong and the blackness is weak. Therefore, in order to suppress white and emphasize black, the glass body as the display device screen is colored gray. Recently, displays having a curved surface on the light source side such as a cathode ray tube and a flat surface on the viewer side, that is, the outside have been used. In such a display, the center of the screen of the glass body is thin, and becomes thicker toward the side edges. In the glass bodies having different thicknesses as described above, the coloring of the central portion is deep,
It is necessary to sequentially reduce the coloring of the side end. This is to make the light transmittance or scattering rate of the glass body constant over the entire screen. However, changing the coloring of the glass body sequentially complicates the production process and increases the cost.
Further, it is necessary to variously change the degree of gray depending on the type of the color-forming body or the type of the display material. Coloring the glass body to meet such demands tends to complicate the glass body production process and increase the cost. Also, as electronic displays become larger,
The reflection of fluorescent light and sunlight becomes remarkable, and the demand for prevention of this becomes even stronger. When the transmittance or scattering of light of the glass body as the display device screen is not suitable for the display material, the contrast between black and white is poor and an image having an original hue cannot be viewed.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a method for adjusting light transmittance and adjusting a color tone corresponding to various displays.
Furthermore, an object of the present invention is to provide an electronic display sticking film that can easily and easily adjust the reflection and reflection of fluorescent light and sunlight.

[0004]

As a result of various studies, the present inventors have found that the above object can be achieved by preparing a film having a pressure-sensitive adhesive layer containing a colorant on one surface of a substrate. Was. That is, the present invention provides an adhesive film for an electronic display, characterized in that an adhesive layer in which carbon black is dispersed is provided on one surface of a substrate.
Further, the present invention provides an adhesive film for an electronic display, wherein an adhesive layer in which a colorant is dispersed is provided on one surface of a transparent substrate having an antireflection layer provided on one or both surfaces of the transparent substrate. provide. The present invention further provides the adhesive film for an electronic display, wherein the pressure-sensitive adhesive layer further contains a coloring pigment. The present invention further provides an adhesive film for an electronic display colored in neutral gray. The present invention further provides that the carbon black in the pressure-sensitive adhesive layer has an average particle diameter of 30 nm or less,
It is preferably 20 nm or less, and the BET specific surface area is 10
Provided is an adhesive film for an electronic display, which is 0 m ² / g or more, preferably 250 m ² / g or more.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, an electronic display preferably used means an electronic display in which a viewer side of an image display section is flat in at least one of a horizontal axis direction and a vertical axis direction. For example, the viewer side is a plane in both the horizontal axis direction and the vertical axis direction and the coloring light source side is a curved surface, that is, a spherical surface, or the viewer side is a curved surface centered on the vertical axis direction, that is, a cylindrical shape. means. Examples of the electronic display to which the present invention is applied include various electronic displays such as a liquid crystal display (LCD), a plasma display (PDP), a CRT, and an electroluminescence (EL).

The substrate used in the present invention includes:
A colorless and transparent film is preferably used. However, the tint can be adjusted by appropriately blending various coloring agents into the pressure-sensitive adhesive layer, so that the presence of a slight tint is permissible. The film used in the present invention is exemplified below. Polyethylene terephthalate (PET), triacetyl cellulose (TAC), polyarylate, polyimide, polyether, polycarbonate, polysulfone, polyethersulfone, cellophane, aromatic polyamide, polyethylene, polypropylene, polyvinyl alcohol and the like.
Particularly preferred films include PET and TAC.

[0007] An anti-reflection layer for preventing reflection of external incident light may be provided on one or both surfaces of the transparent substrate. The antireflection layer is formed by providing layers having different refractive indexes. Conventionally known various methods such as sequentially providing a low refractive index layer such as siloxane, and further providing a high refractive index layer / low refractive index layer can be employed. The high-refractive-index layer can be provided by depositing or sputtering an inorganic substance such as a metal or a metal oxide. The transparent substrate is preferably subjected to a surface modification treatment in order to improve the adhesion of the antireflection layer and the pressure-sensitive adhesive layer to the transparent substrate. As a surface modification treatment method, an appropriate method such as a surface treatment such as an alkali treatment, a corona treatment, a plasma treatment, a fluorine treatment, a sputtering treatment, or a surfactant or a silane coupling agent can be adopted. Further, an antistatic layer may be provided on the outer side of the transparent base material in order to prevent dirt such as dust adhering to the surface of the electronic display. Antistatic layer is made of metal such as aluminum and tin, IT
A method in which a metal oxide film such as O is provided very thinly by vapor deposition, sputtering, etc. Various methods such as a method of dispersing and solvent coating can be appropriately employed.

Since the adhesive film for an electronic display of the present invention is applied to a viewer side of a flat electronic display, for example, on the side opposite to a light source for coloring for a long period of time, weather resistance and light resistance are provided. It is required that sex and the like last. In order to satisfy these characteristics, conventionally known various additives such as an ultraviolet absorber, a light stabilizer, a metal deactivator, and an ozone deterioration inhibitor are appropriately added to the pressure-sensitive adhesive layer, the antistatic layer, and the like as necessary. Can be added. The transparent substrate is 20-3
Those having a size of 00 μm, preferably 50 to 200 μm are preferably used.

The carbon black suitable for use in the present invention has an average particle size of preferably 30 nm or less, more preferably 20 nm or less, and a BET specific surface area of 100 nm or less.
m ² / g or more, more preferably 250 m ² / g or more. In order to adjust the light transmittance and the light scattering rate of the image display unit to an appropriate range, it is preferable that the above-mentioned particle diameter and the BET specific surface area are provided. Further preferred characteristics of the carbon black used in the present invention include a high oil absorption, an acidic carbon having a pH of 4 or less, and a volatile content of 10% by weight or more. Carbon black satisfying the above properties can be easily obtained on the market. For example, Degussa (Germany) “Color
Black FW200 (average particle diameter 13nm, BET specific surface area 460m ² /
g, pH 2.5) ”,“ Special Black 4 (25 nm, 180 m ²
/ g, pH 3.0) ”,“ Color Black FW 2 (13 nm, 460)
m ^{2 /} g, pH2.5) ”,“ Special Black 6 (17 nm, 300 m ² /
g, pH 2.5) ”and“ # 2350 (15 nm, 260 m ² /
g, pH2) ”,“ # 2400 (15 nm, 260 m ² / g, pH2) ”,“ #
1000 (18 nm, 200 m ² / g, pH 3) ”,“ # 970 (16 nm,
250m ^{2 /} g, pH 3.5) ”, Degussa“ Special Black ”
5 (20 nm, 240 m ² / g, pH 3) ”,“ Cabot's “MONARCH1300 (13 nm, 560 m ² / g, pH 3)”, “MONAR
CH1400 (13 nm, 560 m ² / g, pH 3) ”,“ MONARCH1000
(16 nm, 340 m ² / g, pH 3) ”,“ Black Pearls1300 ”
(13 nm, 560 m ² / g, pH 3) ”,“ Black Pearls1400
(13 nm, 560 m ² / g, pH 3) ”,“ Black Pearls1000
(16 nm, 340 m ² / g, pH 3) ”,“ MOGUL (24 nm, 14
^{0m 2 / g, pH4) "} ," Black Pearls L (24nm, 140m 2 / g,
pH 4) "and Columbia Raven7000 (11 nm, 640 m ²
/ g, pH3) "," Raven5750 (12nm, 620m 2 / g, pH
3) ”,“ Raven5000 (8 nm, 580 m ² / g, pH 3) ”,“ R
^{aven3500 (13nm, 380m 2 / g} , pH4) "," Raven5250
(16 nm, 590 m ² / g, pH 3) ”. When the pressure-sensitive adhesive has a carboxyl group or a hydroxyl group, it is preferable to use acidic carbon.
Is 4 or less. Acidic carbon is obtained by oxidizing the carbon surface.

In the present invention, the light scattering rate is also expressed as haze. Haze is a value measured as follows. Haze (%) = (scattered light intensity / total light transmission intensity) × 10
Normally, it is considered that the color tone of the glass body as the image display section is preferably neutral gray. Neutral gray means that in the hue display by Lab, the a value and the b value are hues near zero. More specifically, the a value and the b value are each within ± 5, preferably, the a value is within ± 3, the b value is within ± 4, and optimally, the a value is +1 to 1.
-2.5, meaning hue with b value within ± 3.5.
If the a value and the b value exceed the above ranges, they will affect the display color of the electronic display, resulting in poor color reproducibility. If the pigment to be added to the adhesive layer is only carbon black, the desired hue may not be obtained, and the color tends to be brown, and depending on the coloring material, black-white contrast may be poor or various hues may be poor. For this reason, in order to respond to the demand due to changes in the color developing body, etc., the hue of the adhesive film,
A pigment is added. The pigment has an average particle size of 0.0
Those having a thickness of 1 to 5 μm, more preferably 0.01 to 1 μm are preferably used. Illustrative pigments suitable for use in the present invention are as follows. Isoindolinone,
Anthraquinone, dioxazine, azo, naphthol, quinophthalone, azomethine, benzimidazolone, perinone, pyranthrone, quinacridone, perylene, phthalocyanine, sulene and the like. Preferred examples include dioxazine-based, azo-based, naphthol-based, quinacridone-based red pigments, and phthalocyanine-based blue pigments.The most preferred pigments include quinacridone-based pigments, dioxazine-based pigments, and copper phthalocyanine-based pigments. can give. These pigments can be appropriately mixed and used in order to adjust to a desired hue. For adjusting the hue, a dye can be added. However, dyes are inferior in weather resistance and have a large change in light transmittance when used for a long time, and are not suitable for use in the present invention.

It is desired that the pressure-sensitive adhesive used in the present invention has removability, no adhesive residue at the time of peeling, and no peeling or generation of bubbles in a forced aging test under high temperature and high humidity. . The pressure-sensitive adhesive having such characteristics can be appropriately selected from acrylic, rubber, polyvinyl ether, and silicone. Most preferred is an acrylic pressure-sensitive adhesive. The acrylic pressure-sensitive adhesive is a copolymer of an alkyl (meth) acrylate and a polymerizable unsaturated carboxylic acid or a hydroxyl group-containing ethylenically unsaturated monomer, or a copolymerizable vinyl monomer in an organic solvent or an aqueous medium. Obtained. For the polymerization, a polymerization method by radical polymerization is preferably employed. Preferably, a solution polymerization method, a suspension polymerization method, an emulsion polymerization method and the like are used. The preferred molecular weight of the above copolymer is such that the number average molecular weight by gel permeation chromatography is 10,000 to 1,0.
00,000, preferably 50,000-500,00
0, more preferably 100,000 to 400,000
It is. When the number average molecular weight is less than 10,000, it becomes difficult to form a uniform resin composition layer, and
If it exceeds 0, the elasticity becomes high, and problems such as difficulty in adjusting the coating amount occur. Examples of the alkyl (meth) acrylate include an alkyl group having 1 to 12 carbon atoms, and examples thereof include methyl (meth) acrylate, butyl (meth) acrylate, and octyl (meth) acrylate. More specifically, as the methacrylate-based component, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-hexyl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl methacrylate, n-octyl Methacrylate, isooctyl methacrylate, lauryl methacrylate and the like, and as the acrylate component, methyl acrylate,
Examples include ethyl acrylate, propyl acrylate, butyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, lauryl acrylate, and the like. These can be used alone or in combination of two or more. The combined use of a (meth) acrylate-based monomer having a carboxyl group and / or a hydroxyl group as a functional group improves the dispersibility of carbon. Optimally, the dispersibility when acid carbon is used is further improved. It is preferred in terms of. Examples of the monomer having such a functional group include (meth) acrylic acid having a carboxyl group, maleic acid, itaconic acid, and crotonic acid, and the like. Examples thereof include propyl ester and 2-hydroxyvinyl ether. These are the aforementioned acrylate-based components and / or
Alternatively, they can be used alone or as a mixture of two or more of them with a methacrylate-based component. A crosslinking agent may be blended in the adhesive. The compounding amount is usually 0.01 to 10 parts by weight based on 100 parts by weight of the acrylic pressure-sensitive adhesive. Examples of the crosslinking agent include an isocyanate compound, an aluminum chelate, an aziridinyl compound, and an epoxy compound. The pressure-sensitive adhesive is made into an organic solvent solution, and is applied to the transparent substrate by a coating machine such as a roll coater, a reverse coater, a comma coater, a lip coater, and a die coater. By laminating a release-treated film or paper on the pressure-sensitive adhesive layer side of the transparent substrate, handling convenience can be achieved.

Hereinafter, the present invention will be described more specifically based on embodiments. Production Example <Polymerization example of acrylic polymer a> 94 parts by weight of n-butyl acrylate, 6 parts by weight of acrylic acid, 0.3 part by weight of benzoyl peroxide in a flask equipped with a thermometer, a stirrer, a reflux condenser, and a nitrogen inlet tube. , 40 parts by weight of ethyl acetate and 60 parts by weight of toluene, and then nitrogen was introduced from a nitrogen inlet tube to make the inside of the flask a nitrogen atmosphere. An acrylic polymer solution having a molecular weight of about 1.2 million (number-average molecular weight of about 300,000) and a Tg of about -49 ° C. was obtained. Ethyl acetate was added to this acrylic polymer solution so as to have a solid content of 20% by weight to obtain a master batch acrylic polymer solution a. This solution a
To 100 parts by weight (as solid content) of N, N, N ',
N'-tetraglycidyl-m-xylenediamine 0.1
By weight, an adhesive coating liquid a 'was obtained.

<Polymerization Example of Acrylic Polymer b> Thermometer,
96 parts by weight of n-butyl acrylate, 3 parts by weight of acrylic acid, 1 part by weight of 2-hydroxyethyl acrylate, 0.3 part by weight of benzoyl peroxide, ethyl acetate in a flask equipped with a stirrer, a reflux condenser, and a nitrogen inlet tube. After adding 40 parts by weight of toluene and 60 parts by weight of toluene, nitrogen was introduced from a nitrogen inlet tube to make the inside of the flask a nitrogen atmosphere, and then heated to 65 ° C. to carry out a polymerization reaction for 10 hours to obtain a weight average molecular weight of about 10%.
An acrylic polymer solution having a molecular weight of 10,000 (number average molecular weight of about 260,000) and a Tg of about -50 ° C was obtained. Ethyl acetate was added to this acrylic polymer solution so as to have a solid content of 20% by weight to obtain a masterbatch acrylic polymer solution b. 1.0 part by weight of a polyisocyanate ("Coronate L", manufactured by Nippon Polyurethane Co., Ltd.) was added to 100 parts by weight (as a solid content) of this solution b to obtain an adhesive coating liquid b '.

<Example 1> Acrylic polymer solution a for masterbatch was added to carbon black Special Black 6 (manufactured by Degussa: primary particle diameter 17 nm, BET specific surface area) in 100 parts by weight (as solid content) of solution a. 300m ² /
g, a volatile content of 18% by weight and a pH of 2.5) were added and stirred to prepare a master batch solution A in which carbon black was sufficiently dispersed. Adhesive coating liquid a'1
After adding 0.2 parts by weight of the master batch solution A to 00 parts by weight (adhesive agent concentration: 20% by weight), stirring the mixture to make it uniform, and then applying the dried adhesive to a 38 μm-thick PET film. Coating was performed so that the thickness of the layer was 25 μm, and the coating was dried. The adhesive layer surface was adhered to an untreated surface of a 188 μm-thick transparent PET film that had been subjected to ITO sputtering anti-reflection treatment to obtain a colored adhesive film of the present invention.

Example 2 6 parts by weight of carbon black
Special Black 6 is 11 parts by weight of Color Black FW200 (made by Degussa: primary particle diameter 13 nm, BET specific surface area 460 m)
² / g, volatile content 20% by weight, pH 2.5), except that master batch solution B was prepared in the same manner as in Example 1. 0.5 part by weight of the master batch solution B was added to 100 parts by weight of the pressure-sensitive adhesive coating liquid a ′ (concentration of the pressure-sensitive adhesive was 20% by weight), and the mixture was stirred so as to be uniform, and then subjected to a release treatment with a thickness of 38 μm. The PET film was coated so that the thickness of the adhesive layer after drying was 25 μm, and dried. The adhesive layer surface was subjected to an anti-reflection treatment in the same manner as in Example 1 to a thickness of 18
It was stuck on the untreated surface of an 8 μm transparent PET film to obtain a colored pressure-sensitive adhesive film of the present invention.

Example 3 6 parts by weight of carbon black
4.5 parts by weight of Special Black 6 Special Black 4 (made by Degussa: primary particle diameter 25 nm, BET specific surface area 180 m)
² / g, volatile content 14% by weight, pH 3)
A master batch solution C was prepared in the same manner as in Example 1. 0.2 parts by weight of the master batch solution C was added to 100 parts by weight of the pressure-sensitive adhesive coating liquid a '(20% by weight of the pressure-sensitive adhesive), and the mixture was stirred so as to be uniform, and then subjected to a release treatment of PET having a thickness of 38 μm. The film was applied so that the thickness of the adhesive layer after drying was 25 μm, and dried. The surface of the adhesive layer was subjected to an antireflection treatment in the same manner as in Example 1 to a thickness of 188 μm.
Was adhered to the untreated surface of the transparent PET film of Example 1 to obtain a colored pressure-sensitive adhesive film of the present invention.

<Example 4> To 100 parts by weight (as solid content) of the acrylic polymer solution b for a masterbatch, 8.
5 parts by weight of carbon black Color Black FW 200 and 5 parts by weight of a blue organic pigment (monochlorocyanine blue)
Was added and stirred to prepare a master batch solution D in which carbon black and a blue pigment were sufficiently dispersed. To 100 parts by weight of the pressure-sensitive adhesive coating solution b ′ (concentration of pressure-sensitive adhesive of 20% by weight), 0.5 part by weight of a master batch solution D was added,
After stirring so as to be uniform, a 38 μm-thick PET film subjected to a peeling treatment has a thickness of the adhesive layer after drying of 25 μm.
It was applied to a thickness of μm and dried. This adhesive layer surface was adhered to the untreated surface of a 188 μm-thick transparent PET film that had been subjected to antireflection treatment in the same manner as in Example 1 to obtain a colored adhesive film of the present invention.

Example 5 A masterbatch solution was prepared in the same manner as in Example 4, except that 5 parts by weight of a blue organic pigment (monochlorocyanine blue) was replaced by 5 parts by weight of a red organic pigment (quinacridone red). E was produced. 0.5 part by weight of the master batch solution E was added to 100 parts by weight of the pressure-sensitive adhesive coating solution b ′ (20% by weight of the pressure-sensitive adhesive), and the mixture was stirred so as to be uniform, and then subjected to a release treatment with a thickness of 38 μm. P
The ET film was coated so that the thickness of the adhesive layer after drying was 25 μm, and dried. The adhesive layer surface was adhered to an untreated surface of a transparent triacetyl cellulose (TAC) film having a thickness of 80 μm which had been subjected to an antireflection treatment by siloxane coating, to obtain a colored adhesive film of the present invention.

<Example 6> In 100 parts by weight (as a solid content) of the acrylic polymer solution b for master batch, 7.
3. 5 parts by weight of carbon black Color Black FW200;
5 parts by weight of blue organic pigment (monochlorocyanine blue)
After adding 2.2 parts by weight of a red organic pigment (quinacridone red) and stirring, a master batch solution F in which carbon black, blue pigment and red pigment were sufficiently dispersed was prepared. To 100 parts by weight of the adhesive coating solution b '(20% by weight of the adhesive), 0.5 part by weight of the master batch solution F was added, and the mixture was stirred so as to be uniform.
Was applied so that the thickness of the adhesive layer after drying was 25 μm, and dried. This adhesive layer surface was subjected to anti-reflection treatment in the same manner as in Example 1 to a thickness of 1
The colored pressure-sensitive adhesive film of the present invention was obtained by sticking to the untreated surface of a transparent PET film of 88 μm.

Example 7 2.5 parts by weight of a dioxazine pigment as a red pigment and a phthalocyanine pigment as a blue pigment
Except having replaced with 0 weight part, it operated similarly to Example 6 and
The colored adhesive film of the present invention was obtained.

<Comparative Example 1> A solution of 0.48 parts by weight of a spirone dye (metal complex salt type) (TK-, manufactured by Toa Kasei Co., Ltd.) was added to 100 parts by weight (20% by weight of the adhesive) of the adhesive coating solution b '. Smoked) and stirred to make it uniform.
An 8 μm release-treated PET film was coated so that the thickness of the adhesive layer after drying was 25 μm, and dried.
This adhesive layer surface was adhered to an untreated surface of a 188 μm-thick transparent PET film that had been subjected to antireflection treatment in the same manner as in Example 1 to obtain a colored adhesive film for comparison.

<Comparative Example 2> 2.4 parts by weight of a solution of a spirone dye (metal complex salt type) (TKA, manufactured by Toa Kasei Co., Ltd.) was added to 100 parts by weight of the adhesive coating solution a '(20% by weight of the adhesive). Smoke) and 2 parts by weight of an ultraviolet absorber (TINUVIN109, manufactured by Ciba Geigy), stirred to make it uniform, and then subjected to a 38 μm-thick release-treated PET.
The film was coated so that the thickness of the adhesive layer after drying was 25 μm, and dried. This adhesive layer surface was attached to a transparent PET film having a thickness of 188 μm and subjected to antireflection treatment in the same manner as in Example 1 to obtain a colored adhesive film for comparison.

<Preparation of Evaluation Sample> The peeled PET film (38 μm) was peeled off from the colored pressure-sensitive adhesive films obtained in the above Examples and Comparative Examples, and affixed to a glass plate (Matsunami Glass Co., Ltd., micro slide glass). Together
The following tests were performed.・ Fade meter fading test Evaluated sample is fade meter (manufactured by Suga Test Instruments Co., Ltd., UV long life fade meter FAL-AU type)
Set so that the colored adhesive film side is exposed to
The transmittance and haze after 0 hour were measured. -Measurement of transmittance About the evaluation sample before and after setting the fade meter, the wavelength is 550 nm from the colored adhesive film side.
Was measured using a spectrophotometer (Visible UV spectrophotometer UVDEC-670, manufactured by JASCO Corporation). Measurement of Haze For the evaluation samples before and after setting the fade meter, a haze meter (manufactured by Nippon Denshoku Co., Haze Meter NDH200) was used from the colored adhesive film side.
0).・ Measurement of a value and b value Spectrophotometer (Visible ultraviolet spectrophotometer U manufactured by JASCO Corporation)
VDEC-670). Table 1 shows the measurement results of the transmittance and the haze of each evaluation sample.

Table 1 Fade meter before fade meter set 400 hours after fade meter Transmittance (%) Haze transmittance (%) Haze Example 1 71.5 1.9 71.8 1.8 Example 2 58.2 1.6 58.3 1.7 Example 3 82.2 2.1 83.4 2.2 Example 4 56.3 2.5 57.0 2.3 Example 5 57.4 2.7 57.8 6 Example 6 56.2 2.5 56.7 2.6 Example 7 57.6 2.6 57.7 2.6 Comparative Example 1 43.5 0.8 58.9 1.1 Comparative Example 2 41 .2 0.9 50.7 1.1

[0025]

It is preferable that both the transmittance and the haze do not change before and after setting to the fade meter, and the haze is preferably 3 or less. The transmittance of the sample of the comparative example fluctuates greatly before and after the setting to the fade meter. The colored pressure-sensitive adhesive films obtained in the above Examples and Comparative Examples were applied to a color graphic electronic display for personal computers having a cylindrical screen (“D1726T-H” manufactured by DELL).
S "), and the black and white contrast of the left and right sides of the screen (the film-attached surface and the film-non-adhered surface) was visually evaluated. At this time, the evaluation was performed with the brightness of the electronic display brightened. The reflection of the fluorescent lamp (interior lamp) on the electronic display was visually evaluated at a standard luminance, and the surface on which the colored adhesive film of the present invention was adhered was distinguished from black and white as compared with the film non-adhered surface. The contrast was clear and the black-and-white contrast was good, and the reflection of the fluorescent light on the film-attached surface was suppressed as compared with the non-adhered surface.

[0027]

According to the present invention, a transparent base material provided with a pressure-sensitive adhesive layer containing carbon black and, if necessary, an organic pigment is attached to the outside of a glass body as an image display device, thereby facilitating easy application. The light transmittance and hue from the color light source can be adjusted simply and inexpensively. The dispersibility of carbon black can be improved by making the pressure-sensitive adhesive layer contain an acrylic pressure-sensitive adhesive having a carboxyl group and / or a hydroxyl group and making carbon black acidic carbon.

Claims (8)

[Claims] 1. An adhesive film for an electronic display, comprising an adhesive layer having carbon black dispersed on one surface of a transparent substrate. 2. The adhesive film for an electronic display according to claim 1, wherein an anti-reflection layer is provided on one or both surfaces of a transparent substrate. 3. The adhesive film for an electronic display according to claim 1, further comprising a coloring pigment other than carbon black in the pressure-sensitive adhesive layer. 4. The adhesive film for an electronic display according to claim 3, wherein the color pigment is a red and / or blue pigment. 5. The adhesive film for an electronic display according to claim 1, 2 or 3, wherein the adhesive film for an electronic display is colored neutral gray. 6. The adhesive film for an electronic display according to claim 5, wherein the a value and the b value are within ± 5. 7. The carbon black in the pressure-sensitive adhesive layer has an average particle size of 30 nm or less and a BET specific surface area of 100.
The adhesive film for an electronic display according to claim 1, which has an m ² / g or more. 8. The pressure-sensitive adhesive layer according to claim 1, wherein the pressure-sensitive adhesive layer contains an acrylic pressure-sensitive adhesive having a carboxyl group and / or a hydroxyl group, and the carbon black is acidic carbon.
The adhesive film for an electronic display according to the above.