JP2011209512A - Scattering preventing film for image display device and image display device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scattering preventing film for an image display device which has an excellent scattering preventing property of glass and has excellent visibility of a display part when stuck to a glass substrate constituting the image display device and to provide the image display device equipped with the same.SOLUTION: The scattering preventing film 100 for the image display device comprises a base material film 11 which has a refractive index of 1.45 to 1.55 and an adhesive layer 12 which is provided on one surface 11a of the base material film 11 and has the refractive index of 1.45 to 1.55.

Description

 The present invention relates to an anti-scattering film for an image display device and an image display device including the same, and more particularly, prevents scattering due to breakage of a glass substrate constituting an image display device of a mobile terminal device such as a mobile phone or a mobile device. Therefore, the present invention relates to an anti-scattering film for an image display device that is adhered to the surface of the glass substrate and an image display device including the same.

In recent years, mobile terminal devices are required to be thinner and lighter. Conventionally, a plastic plate having a high light transmittance has been used on the surface of an information display unit of a portable terminal device from the viewpoint of making the displayed information easy to see and preventing damage even if dropped. However, when a certain level of thinness is required for a plastic plate, the strength is insufficient. In order to solve this problem, a tempered glass substrate has been used on the surface of the information display unit.
However, when only a tempered glass substrate is used, the glass substrate is damaged when the mobile terminal device is dropped, and the glass substrate is scattered. For this reason, it has been studied to prevent scattering of the glass substrate by bonding a scattering prevention film with an adhesive layer to the surface of the tempered glass substrate.

In general, a polyethylene terephthalate (PET) film that is inexpensive and has an anti-scattering effect is used as the anti-scattering film. Since the PET film generally has low adhesion to the pressure-sensitive adhesive layer, a PET film with an easy adhesion layer provided with a thin film called an easy adhesion layer is used to improve the adhesion.
However, the PET film with an easy-adhesion layer has a problem that clear interference fringes due to the easy-adhesion layer may appear and the visibility of information displayed on the information display unit of the mobile terminal device is hindered. . This interference fringe is mainly caused by reflection of light having a wavelength of 625 nm to 780 nm, that is, red light (interference color), on the outer surface side of the PET film with an easy adhesion layer.
Therefore, the scattering prevention film with reduced interference fringes includes, for example, a base film, a hard coat layer provided on one surface thereof, and an adhesive layer provided on the other surface, and a hard coat A value obtained by multiplying the thickness of the layer by the internal haze of the base film is 4 or more, and the ten-point average roughness (Rz) of the surface of the hard coat layer is 2 μm or less ( For example, see Patent Document 1).

JP 2008-216913 A

 On the other hand, in recent years, a large number of portable terminal devices having a design in which a glass substrate is exposed have been sold, and the visibility is favored. However, in order to prevent scattering of the glass substrate, when the anti-scattering film with reduced interference fringes is attached to the glass substrate of such a portable terminal device, the glass substrate is stripped by a slight interference color. There was a problem that the visibility was lower than in the state.

 The present invention has been made in view of the above circumstances, and when adhered to a glass substrate constituting an image display device, the image display device has excellent glass scattering prevention properties and display portion visibility. An object of the present invention is to provide a scattering prevention film and an image display device including the same.

 The scattering prevention film for an image display device of the present invention has a base film made of a triacetyl cellulose film having a refractive index of 1.45 to 1.55, and a refractive index provided on at least one surface of the base film. And an adhesive layer of 1.45 to 1.55.

 In the anti-scattering film for an image display device of the present invention, a hard coat layer having a refractive index of 1.45 to 1.55 is provided on the surface of the base film opposite to the surface in contact with the pressure-sensitive adhesive layer. It is preferable that

  In the scattering prevention film for an image display device of the present invention, the luminous reflectance of light having a wavelength of 380 to 780 nm on the surface of the base film opposite to the surface in contact with the pressure-sensitive adhesive layer is 8.5%. The following is preferable.

  The scattering prevention film for an image display device of the present invention is preferably used for a display screen of a portable information terminal device.

  An image display device of the present invention is an image display device comprising an image display panel, a glass substrate disposed on the display unit of the image display panel, and the anti-scattering film for the image display device of the present invention. The anti-scattering film for an image display device is provided on the surface of the glass substrate opposite to the surface facing the image display panel by the adhesive layer provided on one surface of the base film. Is affixed.

  According to the anti-scattering film for an image display device of the present invention, when the anti-scattering film is adhered to the glass substrate disposed on the display unit of the image display panel to constitute the image display device, the glass is scattered. In addition to excellent prevention, the amount of reflection of red light (interference color) on the surface opposite to the surface in contact with the adhesive layer of the base film is reduced, and the display part of the image display panel can be seen well can do.

It is a schematic sectional drawing which shows 1st embodiment of the scattering prevention film for image display apparatuses of this invention. It is a schematic sectional drawing which shows 1st embodiment of the image display apparatus of this invention. It is a schematic sectional drawing which shows 2nd embodiment of the scattering prevention film for image display apparatuses of this invention. It is a schematic sectional drawing which shows 3rd embodiment of the scattering prevention film for image display apparatuses of this invention. It is a schematic sectional drawing which shows 4th embodiment of the scattering prevention film for image display apparatuses of this invention. It is a schematic sectional drawing which shows 2nd embodiment of the image display apparatus of this invention. It is a schematic sectional drawing which shows 5th embodiment of the scattering prevention film for image display apparatuses of this invention. It is a schematic sectional drawing which shows 6th embodiment of the scattering prevention film for image display apparatuses of this invention.

Embodiments of an anti-scattering film for an image display device of the present invention and an image display device including the same will be described.
This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified.

(1) First embodiment of anti-scattering film for image display device and first embodiment of image display device FIG. 1 is a schematic cross-sectional view showing the first embodiment of the anti-scattering film for an image display device of the present invention. FIG.
An image display device scattering prevention film (hereinafter, abbreviated as “scattering prevention film”) 100 of this embodiment includes a base film 11 and an adhesive layer 12 provided on one surface 11 a of the base film 11. It is roughly composed.

FIG. 2 is a schematic sectional view showing the first embodiment of the image display apparatus of the present invention.
The image display device 130 of this embodiment includes an image display panel 31, and a conductive glass substrate 33 disposed on a display unit (display surface) 31 a of the image display panel 31 via a conductive film adhesive layer 32. The anti-scattering film 100 adhered to the surface (hereinafter referred to as “the other surface”) 33a opposite to the surface facing the image display panel 31 of the conductive glass substrate 33. Yes.

The conductive glass substrate 33 includes a glass substrate 34 and a transparent conductive film 35 provided on one surface 34a thereof.
Therefore, the anti-scattering film 100 is adhered to the surface (hereinafter referred to as “the other surface”) 34 b opposite to the surface facing the image display panel 31 of the glass substrate 34 by the adhesive layer 12. Has been.
The other surface 33a of the conductive glass substrate 33 and the other surface 34b of the glass substrate 34 are the same surface.

  That is, the image display device 130 has a configuration in which the image display panel 31, the conductive film adhesive layer 32, the conductive glass substrate 33, and the scattering prevention film 100 are laminated in this order.

The base film 11 is a triacetyl cellulose film.
By making it a triacetyl cellulose film, it has high adhesion to other materials such as pressure-sensitive adhesives, and it is not necessary to perform easy adhesion treatment to improve adhesion to other materials. Sufficient light transmission can be obtained.

The triacetyl cellulose film is a film containing triacetyl cellulose as a main component and a plasticizer such as phosphate ester, phthalic acid or glycolic acid.
Triacetyl cellulose reacts cellulose (cellulose, molecular formula: (C ₆ H ₁₀ O ₅ ) _n ), which is a natural polymer compound, with acetic anhydride to acetylate all hydroxyl groups (—OH) contained in cellulose molecules. This is a polymer compound obtained by substitution (acetylation) with a group (CH ₃ CO—).

  As the base film 11, a triacetyl cellulose film having a refractive index of 1.45 to 1.55 at a wavelength of 589 nm, measured in accordance with Japanese Industrial Standard JIS K7142-2008 “Plastics—How to Obtain a Refractive Index” is used. .

The base film 11 has a refractive index measured under the above conditions of 1.45 to 1.55, and preferably has a refractive index of 1.48 to 1.53.
If the refractive index of the base film 11 is within this range, the refractive index of the base film 11 and the glass substrate 34 that is an application target of the scattering prevention film 100 (target object to which the scattering prevention film 100 is attached). Since the difference between the refractive index (1.45 to 1.55) and the pressure-sensitive adhesive layer (1.45 to 1.55) is small, in the image display device 130 using the scattering prevention film 100, the scattering prevention film 100 is used. The appearance of interference fringes can be reduced.

  If the refractive index of the base film 11 is less than 1.45 or exceeds 1.55, the difference from the refractive index of the glass substrate 34 becomes large, so light with a wavelength of 625 nm to 780 nm, that is, red light (interference color). The amount of reflection increases, and in the image display device 130, the visibility of the display unit 31a of the image display panel 31 decreases.

The thickness of the base film 11 is appropriately adjusted according to the glass scattering prevention performance required for the scattering prevention film 100, preferably 20 to 150 μm, and more preferably 40 to 100 μm.
If the thickness of the substrate film 11 is less than 20 μm, the strength as a substrate is weak, and the processing suitability may be reduced. On the other hand, when the thickness of the base film 11 exceeds 150 μm, it is not preferable from the viewpoint of thinning.

  The pressure-sensitive adhesive layer 12 is a light-transmitting layer made of a pressure-sensitive adhesive, and has a refractive index of 1.40 at a wavelength of 589 nm measured in accordance with Japanese Industrial Standard JIS K7142-2008 “Plastics—How to Obtain Refractive Index”. ~ 1.55.

The pressure-sensitive adhesive layer 12 has a refractive index measured under the above conditions of 1.45 to 1.55, and more preferably 1.45 to 1.52.
The refractive index of the pressure-sensitive adhesive layer 12 is adjusted by performing a molecular design considering a molecular structure that affects the refractive index. For example, it can be adjusted by a method of increasing the refractive index by containing an aromatic ring or a method of decreasing the refractive index by containing a fluorine atom.
If the refractive index of the pressure-sensitive adhesive layer 12 is within this range, the difference between the refractive index of the pressure-sensitive adhesive layer 12 and the refractive index (1.45 to 1.55) of the glass substrate 34 becomes small. In 130, it can reduce that an interference fringe appears in the scattering prevention film 100. FIG.

  If the refractive index of the pressure-sensitive adhesive layer 12 is less than 1.45 or exceeds 1.55, the difference from the refractive index of the glass substrate 34 becomes large, so light with a wavelength of 625 nm to 780 nm, that is, red light (interference color). The amount of reflection increases, and in the image display device 130, the visibility of the display unit 31a of the image display panel 31 decreases.

  The thickness of the pressure-sensitive adhesive layer 12 is appropriately adjusted according to the glass scattering prevention performance required for the scattering prevention film 100, preferably 5 to 30 μm, and more preferably 10 to 25 μm.

As an adhesive which comprises the adhesive layer 12, an acrylic adhesive, a silicone adhesive, a urethane adhesive, a rubber adhesive, a polyester adhesive, etc. are mentioned.
These pressure-sensitive adhesives may be emulsion type, solvent type, or solventless type.
Among these pressure-sensitive adhesives, acrylic pressure-sensitive adhesives are preferable from the viewpoints of easy adhesion control and weather resistance.

The pressure-sensitive adhesive layer 12 formed using an acrylic pressure-sensitive adhesive contains an acrylic resin having a weight average molecular weight of about 500,000 to 2,000,000, preferably 700,000 to 1,700,000, and is a crosslinked acrylic pressure-sensitive adhesive. A layer made of
When the weight average molecular weight is in the above range, a film for preventing scattering can be obtained in which the adhesive force and the holding force are balanced.
In addition, the above-mentioned weight average molecular weight is a value in terms of polystyrene measured by a gel permeation chromatography (GPC) method.

  As the acrylic resin contained in the acrylic pressure-sensitive adhesive, a (meth) acrylic ester copolymer is used. As this (meth) acrylic acid ester copolymer, the (meth) acrylic acid ester having 1 to 20 carbon atoms in the alkyl group of the ester portion, a monomer having a functional group having active hydrogen, and, if desired, Preferred examples include copolymers with other monomers used.

  Here, examples of the (meth) acrylic acid ester having 1 to 20 carbon atoms of the alkyl group in the ester moiety include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) ) Acrylate, isobutyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, and the like. These may be used alone or in combination of two or more.

  On the other hand, examples of the monomer having a functional group having active hydrogen include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl ( (Meth) acrylic acid hydroxyalkyl esters such as (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, acrylamide, methacrylamide, N-methylacrylamide, N-methylmethacrylamide, N -Acrylamides such as methylolacrylamide and N-methylolmethacrylamide, and monoalkylaminoalkyl (meth) acrylates such as methylaminoethyl (meth) acrylate and monoethylaminoethyl (meth) acrylate , Acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, ethylenically unsaturated carboxylic acids such as citraconic acid. These monomers may be used independently and may be used in combination of 2 or more type.

  Examples of other monomers used as desired include vinyl esters such as vinyl acetate and vinyl propionate, olefins such as ethylene, propylene, and isobutylene, halogenated olefins such as vinyl chloride and vinylidene chloride, Examples thereof include styrene monomers such as styrene and α-methylstyrene. These monomers may be used independently and may be used in combination of 2 or more type.

  In the acrylic pressure-sensitive adhesive, the (meth) acrylic acid ester copolymer used as a resin component is not particularly limited as to the form of copolymerization, and may be any of random, block, and graft copolymers. In addition, the (meth) acrylic acid ester copolymer may be used alone or in combination of two or more.

  The acrylic pressure-sensitive adhesive layer is preferably subjected to a crosslinking treatment, and the crosslinking agent used for the crosslinking treatment is not particularly limited, and any of those conventionally used as a crosslinking agent in an acrylic pressure-sensitive adhesive can be arbitrarily selected. Can be appropriately selected and used. Examples of such a crosslinking agent include polyisocyanate compounds, epoxy compounds, melamine resins, urea resins, dialdehydes, methylol polymers, metal chelate compounds, metal alkoxides, metal salts, and the like. A compound is preferably used.

In this invention, this crosslinking agent may be used individually by 1 type, and may be used in combination of 2 or more type. Moreover, although the usage-amount is based also on the kind of crosslinking agent, it is 0.01-20 mass parts normally with respect to 100 mass parts of said (meth) acrylic acid ester-type copolymer solid content, Preferably, it is 0.1. It is selected in the range of -10 parts by mass.
In addition, a tackifier, an antioxidant, an ultraviolet absorber, a light stabilizer, a softener, a silane coupling agent, a filler, and the like can be added to the acrylic pressure-sensitive adhesive as desired.

Moreover, it is preferable that the difference (refractive index difference) of the refractive index of the base film 11 and the adhesive layer 12 is 0.05 or less, and the refractive index difference of the base film 11 and the adhesive layer 12 is. More preferably, 0, that is, the refractive index of the base film 11 and the refractive index of the pressure-sensitive adhesive layer 12 are equal.
When the difference in refractive index between the base film 11 and the pressure-sensitive adhesive layer 12 exceeds 0.05, the amount of light reflected (refracted) at the interface between the base film 11 and the pressure-sensitive adhesive layer 12 increases, resulting in image display. In the device 130, the visibility of the display unit 31a of the image display panel 31 is lowered.

Further, in the anti-scattering film 100, the light having a wavelength of 380 to 780 nm on the side of the base film 11 opposite to the side in contact with the pressure-sensitive adhesive layer 12 (hereinafter referred to as “the other side”) 11b is viewed. The reflectance is preferably 8.5% or less, and the luminous reflectance is more preferably 8.3 to 8.5%. Since the other surface 11b of the base film 11 forms the outer surface of the image display device 130, the user of the image display device 130 views the display unit 31a of the image display panel 31 from this surface side.
If the luminous reflectance of light with a wavelength of 380 to 780 nm on the other surface 11b side of the base film 11 is 8.5% or less, the amount of red light (interference color) reflected on this surface side is reduced, In the image display device 130, the display unit 31 a of the image display panel 31 can be viewed well.

  When the luminous reflectance of light with a wavelength of 380 to 780 nm on the other surface 11b side of the base film 11 exceeds 8.5%, the amount of red light (interference color) reflected on this surface increases, and the image In the display device 130, the visibility of the display unit 31a of the image display panel 31 is lowered.

  Examples of the image display panel 31 include flat panels used in portable terminal devices such as liquid crystal panels and organic EL panels (organic electroluminescence panels).

  Although it does not specifically limit as an adhesive which comprises the adhesive layer 32 for electrically conductive films, A well-known adhesive is used, for example, an acrylic adhesive, a silicone adhesive, a urethane adhesive, a rubber adhesive, Examples include polyester-based pressure-sensitive adhesives.

  The thickness of the pressure-sensitive adhesive layer 32 for the conductive film is appropriately adjusted according to the thickness of the conductive glass substrate 33 and the like, preferably 5 to 30 μm, and more preferably 10 to 25 μm.

Although it will not specifically limit if it is a glass substrate for flat panels as the glass substrate 34 which comprises the electroconductive glass substrate 33, Optical synthetic quartz glass, tempered glass, etc. are used.
The refractive index of the glass substrate 34 used for such a flat panel is generally 1.45 to 1.55.

  The thickness of the glass substrate 34 is appropriately adjusted according to the strength required for the purpose of protecting the display portion 31a of the image display panel 31, and is preferably 0.2 to 3.0 μm, preferably 0.3 to 2.0 μm is more preferable.

  Examples of the transparent conductive film 35 constituting the conductive glass substrate 33 include tin-doped indium oxide (ITO), fluorine-doped tin oxide (FTO), and antimony-doped tin oxide (ATO). Examples thereof include thin films of conductive metal oxides such as Oxide, aluminum-doped zinc oxide (AZO), and gallium-doped zinc oxide (GZO).

  According to the above-described scattering prevention film 100 for an image display device, the base film 11 made of a triacetyl cellulose film having a refractive index of 1.45 to 1.55 and the one surface 11a of the base film 11 are provided. Since it is composed of the pressure-sensitive adhesive layer 12 having a refractive index of 1.45 to 1.55, the reflection amount of red light (interference color) is reduced on the other surface 11b side of the base film 11, and the image display device In this case, the display portion can be visually recognized well.

  Further, according to the image display device 130 described above, the scattering prevention film 100 for an image display device is provided on the base film 11 having a refractive index of 1.45 to 1.55 and one surface 11a of the base film 11. And the other of the conductive glass substrate 33 disposed on the display unit 31a of the image display panel 31 by the pressure-sensitive adhesive layer 12 because the pressure-sensitive adhesive layer 12 has a refractive index of 1.45 to 1.55. When the anti-scattering film 100 is adhered to the surface 33a to constitute the image display device 130, the reflection amount of red light (interference color) is reduced on the other surface 11b side of the base film 11, and the image is displayed. In the display device 130, the display unit 31a of the image display panel 31 can be viewed well.

(2) Second embodiment of scattering prevention film for image display device FIG. 3 is a schematic sectional view showing a second embodiment of the scattering prevention film for an image display device of the present invention. 3, the same components as those of the embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
The scattering prevention film 110 of this embodiment is roughly constituted by a base film 11 and an adhesive layer 12 provided on one surface 11 a of the base film 11, and further, the base film 11 of the adhesive layer 12. A release sheet 21 is affixed to a surface (hereinafter referred to as “one surface”) 12a opposite to the surface in contact with the surface 12a.
That is, the scattering prevention film 110 has a configuration in which the base film 11, the pressure-sensitive adhesive layer 12, and the release sheet 21 are laminated in this order.

Although various release sheets can be used as the release sheet 21 used in the second embodiment of the anti-scattering film for an image display device of the present invention, the release sheet 21 is typically composed of a release sheet substrate having release properties on the surface. Is done.
As the release sheet substrate, polyethylene terephthalate, polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, polyvinyl chloride, vinyl chloride copolymer, polybutylene terephthalate, polyurethane, ethylene-vinyl acetate copolymer, ionomer resin, Resin films such as ethylene (meth) acrylic acid copolymer, polystyrene, polycarbonate, fluororesin, low density polyethylene, linear low density polyethylene, triacetyl cellulose, fine paper, coated paper, glassine paper, laminated paper, etc. It is done.

In order to make the surface of the release sheet substrate have release properties, a release agent such as a fluorine resin, a silicone resin, or a long-chain alkyl group-containing carbamate is attached to the surface by coating.
The thickness of the release sheet substrate is preferably 5 μm to 300 μm, and more preferably 10 μm to 200 μm. In the case of using a polyethylene terephthalate film as the release sheet substrate, the thickness is particularly preferably 10 μm to 100 μm.

  According to the scattering prevention film 110 for an image display device, the base film 11 having a refractive index of 1.45 to 1.55 and the refractive index provided on the one surface 11a of the base film 11 are 1.45. Since it is composed of the 1.55 pressure-sensitive adhesive layer 12, the amount of reflection of red light (interference color) is reduced on the other surface 11b side of the base film 11, and the display portion is improved in the image display device. In addition to being visible, the adhesive surface of the pressure-sensitive adhesive layer 12 can be protected until it is attached to the glass substrate 34 as an adherend.

(3) Third embodiment of scattering prevention film for image display device FIG. 4 is a schematic sectional view showing a third embodiment of the scattering prevention film for an image display device of the present invention. In FIG. 4, the same components as those of the embodiment shown in FIG.
The anti-scattering film 120 of this embodiment is different from the anti-scattering film 110 described above in that the base film 11 and the pressure-sensitive adhesive layer 12 are in the shape of an adherend (here, the conductive glass substrate 33 described above). It is a point that has been punched together.

That is, in the scattering prevention film 120, the adherend (here) extends from the other surface 11b of the base film 11 to one surface 12a of the pressure-sensitive adhesive layer 12 (one surface 21a of the release sheet 21) in the thickness direction. Then, in accordance with the shape of the conductive glass substrate 33), separation lines 41 such as notches (slits) and perforations are formed.
Thereby, if the part inside the separation line 41 is peeled from the peeling sheet 21, the scattering prevention film 120 processed into the shape of the adherend is obtained.

  For this punching process, various punching machines equipped with a punching die (die) having a shape of an adherend and a cutting blade are used.

According to this scattering prevention film 120, since it is previously punched in accordance with the shape of the adherend, after this film is attached to the adherend, excess portions are cut out according to the shape of the adherend. Work becomes unnecessary.
Further, as in the first embodiment, the image display device of this embodiment can be configured by sticking the anti-scattering film 120 to the other surface 34b of the glass substrate 34 by the adhesive layer 12. it can.

Next, the manufacturing method of the scattering prevention film 100 is demonstrated.
First, the adhesive layer 12 is formed on one surface 11a of the base film 11 (step A).
In this step A, as a method of forming the pressure-sensitive adhesive layer 12, (1) Separately, on one surface 21 a of the release sheet 21, the above pressure-sensitive adhesive and other additives are dissolved in a solvent to form a solution. The prepared composition (adhesive-containing composition) is applied, and the composition is dried to produce a base material-less pressure-sensitive adhesive sheet provided with a pressure-sensitive adhesive layer. , A method of transferring to one surface 11a of the base film 11 to form the pressure-sensitive adhesive layer 12, and (2) applying the above-mentioned pressure-sensitive adhesive-containing composition directly to the one surface 11a of the base film 11. A method of drying the composition to form the pressure-sensitive adhesive layer 12 is used.

  In the above method (1) or (2), the pressure-sensitive adhesive-containing composition may be applied by a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method, or a curtain coating method. A known method such as is used.

  In Step A, when the above method (1) is adopted, the release sheet 21 is attached to the other surface 11b of the pressure-sensitive adhesive layer 12, so that the one surface 11a of the base film 11 is applied. When the pressure-sensitive adhesive layer 12 is formed, the manufacturing process is completed, and the anti-scattering film with release sheet 110 in which the adhesive layer 12 of the anti-scattering film 100 is protected by the release sheet 21 is obtained.

  On the other hand, when the above method (2) is adopted in step A, the release sheet 21 is then attached to the other surface 11b of the pressure-sensitive adhesive layer 12 (step B), and the pressure-sensitive adhesive of the scattering prevention film 100 The anti-scattering film 110 with release sheet in which the layer 12 is protected by the release sheet 21 is obtained.

Next, a method for manufacturing the image display device 130 will be described.
First, the conductive film pressure-sensitive adhesive layer 32 is formed on the display portion (display surface) 31a of the image display panel 31 (step C).
In this step C, as a method for forming the conductive film pressure-sensitive adhesive layer 32, a method similar to the method (1) or (2) in the above-described step A is used.

  Next, the conductive glass substrate 33 is adhered to the surface 32a opposite to the surface in contact with the image display panel 31 of the conductive film pressure-sensitive adhesive layer 32 so that the transparent conductive film 35 faces ( Step D).

  Next, after peeling off the release sheet 21 from the anti-scattering film 100 produced as described above, the anti-scattering film 100 is adhered to the other surface 33a of the conductive glass substrate 33 by the adhesive layer 12 (step E). ) To obtain the image display device 130.

(4) Fourth embodiment of scattering prevention film for image display device and second embodiment of image display device FIG. 5 is a schematic cross-sectional view showing a fourth embodiment of the scattering prevention film for an image display device of the present invention. FIG. In FIG. 5, the same components as those of the embodiment shown in FIG.

The anti-scattering film 200 of this embodiment is different from the anti-scattering film 100 of the first embodiment in that a hard coat layer 13 is provided on the other surface 11b of the base film 11.
That is, the scattering prevention film 200 includes a base film 11, an adhesive layer 12 provided on one surface 11 a of the base film 11, and a hard coat layer 13 provided on the other surface 11 b of the base film 11. It is roughly composed of
That is, the scattering prevention film 200 has a configuration in which the hard coat layer 13, the base film 11, and the pressure-sensitive adhesive layer 12 are laminated in this order.

FIG. 6 is a schematic sectional view showing a second embodiment of the image display device of the present invention. In FIG. 6, the same components as those of the embodiment shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.
The image display device 230 of this embodiment includes an image display panel 31, and a conductive glass substrate 33 disposed on a display unit (display surface) 31 a of the image display panel 31 via a conductive film adhesive layer 32. Schematic from the anti-scattering film 200 with a hard coat attached to the surface (hereinafter referred to as “the other surface”) 33a opposite to the surface of the conductive glass substrate 33 facing the image display panel 31. It is configured.

The conductive glass substrate 33 includes a glass substrate 34 and a transparent conductive film 35 provided on one surface 34a thereof.
Therefore, the anti-scattering film 200 is attached to the surface (hereinafter referred to as “the other surface”) 34 b opposite to the surface facing the image display panel 31 of the glass substrate 34 by the adhesive layer 12. Has been.
The other surface 33a of the conductive glass substrate 33 and the other surface 34b of the glass substrate 34 are the same surface.

  That is, the image display device 230 has a configuration in which the image display panel 31, the conductive film pressure-sensitive adhesive layer 32, the conductive glass substrate 33, and the scattering prevention film 200 are laminated in this order.

  The hard coat layer 13 is a light-transmitting layer made of a resin, and has a refractive index of 1.45 at a wavelength of 589 nm measured in accordance with Japanese Industrial Standard JIS K7142-2008 “Plastics—How to Obtain a Refractive Index”. 1.55.

The hard coat layer 13 preferably has a refractive index measured under the above conditions of 1.45 to 1.55, and more preferably 1.46 to 1.54.
If the refractive index of the hard coat layer 13 is within this range, the difference between the refractive index of the hard coat layer 13 and the refractive index of the glass substrate 34 becomes small, so that the image display device 90 interferes with the scattering prevention film 200. The appearance of stripes can be reduced.

  If the refractive index of the hard coat layer 13 is less than 1.45 or exceeds 1.55, the difference from the refractive index of the glass substrate 34 becomes large, so that light with a wavelength of 625 to 780 nm, that is, red light (interference color). The amount of reflection increases, and in the image display device 230, the visibility of the display unit 31a of the image display panel 31 decreases.

  2-15 micrometers is preferable and, as for the thickness of the hard-coat layer 13, 3-10 micrometers is more preferable.

The hard coat layer 13 is a layer formed by curing a curable composition containing an ionizing radiation curable compound applied to the other surface 11b of the base film 11 (hereinafter abbreviated as “curable composition”), Alternatively, it is a layer formed by heating and curing a thermosetting resin applied to the other surface 11 b of the base film 11.
Examples of thermosetting resins include silicone resins, melamine resins, urethane resins, epoxy resins, and alkyd resins. A curable composition is more preferable from the viewpoints of the hardness of the hard coat layer, weather resistance, and the need for no heating step.

  The ionizing radiation curable compound is cured by irradiation with ionizing radiation, and an ultraviolet curable compound, an electron beam curable compound, and the like are preferable, and an ultraviolet curable compound is particularly preferable.

  The ionizing radiation curable compound is preferably an unsaturated monomer, oligomer, resin, or a composition containing these. Specific examples thereof include a bifunctional group such as a polyfunctional acrylate, urethane acrylate, and polyester acrylate. The polyfunctional ionizing radiation curable acrylic compound is more preferable, and urethane acrylate and polyester acrylate are particularly preferable.

 Examples of the polyfunctional acrylate include ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, hexanediol di (meth) acrylate, Methylolethane tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate , Glycerol tri (meth) acrylate, triallyl (meth) acrylate, bisphenol A ethylene oxide modified di (meth) acrylate Etc., and the like.

  The urethane acrylate can be obtained, for example, by esterification by reacting a hydroxyl group of a polyurethane oligomer obtained by a reaction between a polyol such as polyether polyol or polyester polyol and a polyisocyanate, and (meth) acrylic acid.

  Polyester acrylate is obtained by, for example, esterifying the hydroxyl group of a polyester oligomer having hydroxyl groups at both ends obtained by condensation of a polyvalent carboxylic acid and a polyhydric alcohol with (meth) acrylic acid, or by adding alkylene to the polyvalent carboxylic acid. It can be obtained by esterifying the terminal hydroxyl group of an oligomer obtained by adding an oxide with (meth) acrylic acid.

  These ionizing radiation curable compounds may be used alone or in combination of two or more.

Examples of the ionizing radiation used for curing these ionizing radiation curable compounds include ultraviolet rays, electron beams, α rays, and β rays generated from various ionizing radiation generators.
For example, as the ultraviolet rays, those radiated from an ultraviolet lamp are usually used.
As the ultraviolet lamp, a high-pressure mercury lamp, a xenon lamp, or the like that emits ultraviolet light having a spectral distribution in a wavelength region of 300 to 400 nm is usually used.
As for the irradiation amount of an ultraviolet-ray, 50-3000mJ / cm < ² > is preferable normally.

When ultraviolet rays are used, it is preferable to add a photopolymerization initiator to the curable composition.
As the photopolymerization initiator, known photopolymerization initiators such as acetophenone and benzophenone, and oligomer type photopolymerization initiators are used.

A photoinitiator may be used individually by 1 type and may be used in combination of 2 or more type.
Moreover, it is preferable that the mixture ratio of the photoinitiator with respect to an ionizing radiation-curable compound is 0.01-20 mass parts with respect to 100 mass parts of ionizing radiation-curable compounds, and is 0.1-10 mass parts. More preferably.

In addition, fillers such as silica (including colloidal silica), silicon powder, mica, glass beads, acrylic fine powder, and hollow particles may be added to the curable composition as necessary.
In addition, for the curable composition, if necessary, a light stabilizer, an ultraviolet absorber, a catalyst, a colorant, an antistatic agent, a lubricant, a leveling agent, an antifoaming agent, a polymerization accelerator, an antioxidant, a flame retardant Infrared absorbers, surfactants, surface modifiers and the like may be added.

Moreover, in order to make it easy to apply | coat to the other surface 11b of the base film 11 to a curable composition, you may add a diluent and prepare the coating liquid containing a curable composition.
Examples of the diluent include alcohols such as isobutanol, isopropanol, methyl cellosolve, and ethyl cellosolve, aromatic hydrocarbons such as benzene, toluene, and xylene, aliphatic hydrocarbons such as hexane, heptane, octane, nonane, and decane, Examples thereof include ketones such as methyl ethyl ketone, diethyl ketone, and diisopropyl ketone.
The blending amount of the diluent is appropriately adjusted so that the viscosity of the coating solution is within the required range.

  The coating method of the curable composition containing the diluent on the other surface 11b of the base film 11 includes a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method, and a curtain coating. A known method such as a method is used.

Moreover, it is preferable that the difference (refractive index difference) between the refractive index of the base film 11 and the hard coat layer 13 is 0.05 or less, and the difference in refractive index between the base film 11 and the hard coat layer 13 is small. More preferably, the refractive index of the base film 11 is equal to the refractive index of the hard coat layer 13.
When the difference in refractive index between the base film 11 and the hard coat layer 13 exceeds 0.05, the amount of light reflected (refracted) at the interface between the base film 11 and the hard coat layer 13 increases, resulting in image display. In the device 230, the visibility of the display unit 31a of the image display panel 31 is lowered.

Further, in the anti-scattering film 200, light having a wavelength of 380 to 780 nm on the side of the hard coat layer 13 opposite to the surface in contact with the base film 11 (hereinafter referred to as “one surface”) 13a is viewed. The reflectance is preferably 8.5% or less, and the luminous reflectance is more preferably 8.3 to 8.5%. Since one surface 13a of the hard coat layer 13 forms the outer surface of the image display device 230, the user of the image display device 230 views the display unit 31a of the image display panel 31 from this surface side.
If the luminous reflectance of light having a wavelength of 380 to 780 nm on the one surface 13a side of the hard coat layer 13 is 8.5% or less, the amount of red light (interference color) reflected on this surface side is reduced. In the image display device 230, the display unit 31a of the image display panel 31 can be visually recognized well.

  If the luminous reflectance of light with a wavelength of 380 to 780 nm on the one surface 13a side of the hard coat layer 13 exceeds 8.5%, the amount of red light (interference color) reflected on this surface side increases, and the image In the display device 230, the visibility of the display unit 31a of the image display panel 31 is lowered.

  According to the anti-scattering film 200 described above, the base film 11 made of a triacetyl cellulose film having a refractive index of 1.45 to 1.55, and the refractive index provided on one surface 11a of the base film 11 is 1. The adhesive layer 12 having a thickness of 45 to 1.55 and the hard coat layer 13 having a refractive index of 1.45 to 1.55 provided on the other surface 11b of the base film 11 are used. When the image display device 230 is configured by being attached to the other surface 33a of the conductive glass substrate 33 disposed on the display unit 31a of the image display panel 31 by the layer 12, the other surface of the base film 11 The amount of red light (interference color) reflected on the side 11b is reduced, and in the image display device 230, the display portion 31a of the image display panel 31 can be seen well, and the hard coat layer 1 The high pencil hardness properties, fingerprint resistance, effects such as light resistance is obtained.

  According to the image display device 230, the scattering prevention film 200 for an image display device has a base film 11 having a refractive index of 1.45 to 1.55 and a refraction provided on one surface 11 a of the base film 11. Since it is comprised from the adhesive layer 12 with a rate of 1.45 to 1.55 and the hard coat layer 13 with a refractive index of 1.45 to 1.55 provided on the other surface 11b of the base film 11. When the anti-scattering film 200 is adhered to the other surface 33a of the conductive glass substrate 33 disposed on the display unit 31a of the image display panel 31 by the adhesive layer 12, and the image display device 230 is configured. The amount of reflection of red light (interference color) is reduced on the other surface 11 b side of the base film 11, and in the image display device 230, the display unit 31 a of the image display panel 31 can be viewed well. Above, the hard coat layer 13, a high pencil hardness properties, fingerprint resistance, effects such as light resistance is obtained.

(5) Fifth Embodiment of Scattering Prevention Film for Image Display Device FIG. 7 is a schematic cross-sectional view showing a fifth embodiment of the scattering prevention film for an image display device of the present invention. In FIG. 7, the same components as those of the embodiment shown in FIG.
The scattering prevention film 210 of this embodiment includes a base film 11, a pressure-sensitive adhesive layer 12 provided on one surface 11 a of the base film 11, and a hard coat layer provided on the other surface 11 b of the base film 11. 13, and a release sheet 21 is affixed to a surface (hereinafter referred to as “one surface”) 12 a opposite to the surface in contact with the base film 11 of the pressure-sensitive adhesive layer 12. .
That is, the scattering prevention film 210 has a configuration in which the hard coat layer 13, the base film 11, the pressure-sensitive adhesive layer 12, and the release sheet 21 are laminated in this order.

  According to the scattering prevention film 210 for an image display device, the base film 11 having a refractive index of 1.45 to 1.55 and the refractive index provided on one surface 11a of the base film 11 are 1.45. Since it is composed of the 1.55 pressure-sensitive adhesive layer 12, the amount of reflection of red light (interference color) is reduced on the other surface 11b side of the base film 11, and the display portion is improved in the image display device. In addition to being visible, the adhesive surface of the pressure-sensitive adhesive layer 12 can be protected until it is attached to the glass substrate 34 as an adherend.

(6) Sixth Embodiment of Scattering Prevention Film for Image Display Device FIG. 8 is a schematic cross-sectional view showing a sixth embodiment of the scattering prevention film for an image display device of the present invention. In FIG. 8, the same components as those of the first embodiment shown in FIG. 7 are denoted by the same reference numerals, and the description thereof is omitted.
The anti-scattering film 220 of this embodiment differs from the anti-scattering film 200 and anti-scattering film 210 described above in that the base film 11, the pressure-sensitive adhesive layer 12 and the hard coat layer 13 are adherends (here, the above-mentioned The conductive glass substrate 33) is punched in accordance with the shape of the conductive glass substrate 33).

That is, in the anti-scattering film 220, the adherend (here) extends from one surface 13a of the hard coat layer 13 to one surface 12a of the pressure-sensitive adhesive layer 12 (one surface 21a of the release film 21) in the thickness direction. Then, in accordance with the shape of the conductive glass substrate 33), separation lines 41 such as notches (slits) and perforations are formed.
Thereby, if the part inside the separation line 41 is peeled from the peeling film 21, the scattering prevention film 220 processed into the shape of the adherend is obtained.

According to this anti-scattering film 220, since it is previously punched in accordance with the shape of the adherend, after this film is attached to the adherend, excess portions are cut out according to the shape of the adherend. Work becomes unnecessary.
Similarly to the fifth embodiment, the image display device of this embodiment can be configured by sticking the anti-scattering film 220 to the other surface 34b of the glass substrate 34 by the adhesive layer 12. it can.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further more concretely, this invention is not limited to a following example.

"Preparation of hard coat coating solution"
UV curing resin (trade name: beam set 575CB, concentration 100%, with photopolymerization initiator, Arakawa Chemical Industries, Ltd.) 100 parts by weight leveling agent (trade name: BYK-355, concentration 52%, Big Chemie Japan) 0.1 parts by mass) were added and diluted with propylene glycol monomethyl ether to prepare a hard coat coating solution having a UV curable resin concentration of 40% by mass.

“Preparation of pressure-sensitive adhesive-containing composition 1”
To 100 parts by weight of acrylic acid ester copolymer (molecular weight: 800,000, concentration: 35% by mass) obtained by copolymerizing 79% by mass of n-butyl acrylate, 20% by mass of methyl acrylate, and 1% by mass of 2-hydroxyethyl acrylate Toluene and xylylene diisocyanate-based trifunctional adduct (trade name: TD-75, concentration 75% by mass, manufactured by Soken Chemical Co., Ltd.) 0.1 part by weight was added, stirred, and pressure-sensitive adhesive-containing composition 1 was obtained. Prepared.

“Preparation of pressure-sensitive adhesive-containing composition 2”
To 100 parts by weight of an acrylate ester copolymer (molecular weight: 800,000, concentration: 35% by mass) obtained by copolymerizing 77% by mass of n-butyl acrylate, 20% by mass of methyl acrylate, and 3% by mass of acrylic acid, tris ( Acryloxyethyl) isocyanurate resin (trade name: Aronix M-315, molecular weight = 423, trifunctional, manufactured by Toa Gosei Co., Ltd.), 15 parts by weight, photopolymerization initiator (trade name “Irgacure 500”, Ciba Specialty Chemicals) 0.3 parts by weight, tolylene diisocyanate trifunctional adduct (trade name: Coronate L, 75% by mass, manufactured by Nippon Polyurethane), silane coupling agent (trade name: KBM-403) (Shin-Etsu Chemical Co., Ltd.) 0.1 parts by weight was added and stirred to prepare an adhesive-containing composition 2.

"Example 1"
As a base film, a triacetyl cellulose film (trade name: TDTAC 80UL, thickness 80 μm, manufactured by Fuji Film Co., Ltd.) is used, and on one side, a Mayer bar # 12 is used so that the thickness after drying becomes 5 μm. A coating solution for hard coat was applied and dried to form a coating film.
Next, the coating film is irradiated with ultraviolet rays (illuminance: 230 mW / cm, light amount: 200 mJ / cm ² ) under a nitrogen atmosphere, the coating film is cured to form a hard coat layer, a triacetyl cellulose film, A hard coat film comprising a hard coat layer formed on one surface thereof was obtained.
Next, the pressure-sensitive adhesive-containing composition 1 was applied to the release-treated surface of the release sheet (trade name: SP-PET 381031, thickness 38 μm, manufactured by Lintec Corporation) using a die coater so that the thickness after drying was 20 μm. And dried at 120 ° C. for 1 minute to form a pressure-sensitive adhesive layer, thereby obtaining a substrate-less pressure-sensitive adhesive sheet comprising a release sheet and a pressure-sensitive adhesive layer formed on the release-treated surface.
Next, the non-coated surface of the hard coat film (the surface opposite to the surface on which the hard coat layer is provided) is bonded to the pressure-sensitive adhesive layer of the substrate-less pressure-sensitive adhesive sheet, and the scattering prevention film of Example 1 is obtained. Obtained.

"Example 2"
A scattering prevention film of Example 2 was obtained in the same manner as Example 1, except that the pressure-sensitive adhesive-containing composition 2 was used instead of the pressure-sensitive adhesive-containing composition 1 as the pressure-sensitive adhesive layer.

"Example 3"
A scattering prevention film of Example 3 was obtained in the same manner as in Example 1 except that a triacetyl cellulose film (trade name: KC8UX2M, thickness 80 μm, manufactured by Konica Minolta Opto) was used as the base film.

Example 4
A scattering prevention film of Example 4 was obtained in the same manner as in Example 3 except that instead of the pressure-sensitive adhesive-containing composition 1, the pressure-sensitive adhesive-containing composition 2 was used as the pressure-sensitive adhesive layer.

"Example 5"
A scattering prevention film of Example 5 was obtained in the same manner as Example 1 except that a triacetyl cellulose film (trade name: KC8UYW, thickness 80 μm, manufactured by Konica Minolta Opto) was used as the base film.

"Example 6"
A scattering prevention film of Example 6 was obtained in the same manner as in Example 5 except that instead of the pressure-sensitive adhesive-containing composition 1, the pressure-sensitive adhesive-containing composition 2 was used as the pressure-sensitive adhesive layer.

"Example 7"
A scattering prevention film of Example 7 was obtained in the same manner as in Example 1 except that a triacetyl cellulose film (trade name: TFY80UL, thickness of 80 μm, manufactured by Fuji Film Co., Ltd.) was used as the base film.

"Example 8"
A scattering prevention film of Example 8 was obtained in the same manner as Example 7 except that the pressure-sensitive adhesive-containing composition 2 was used instead of the pressure-sensitive adhesive-containing composition 1 as the pressure-sensitive adhesive layer.

"Comparative Example 1"
Comparative Example as in Example 1 except that a polyethylene terephthalate film with an easy adhesion layer (trade name: PET50T600E, thickness 50 μm, manufactured by Mitsubishi Plastics) was used as the base film instead of the triacetylcellulose film. 1 was obtained.

"Comparative Example 2"
The scattering prevention film of the comparative example 2 was obtained like the comparative example 1 except having used the adhesive containing composition 2 instead of the adhesive containing composition 1 as an adhesive layer.

“Comparative Example 3”
Comparative Example as in Example 1 except that a polyethylene terephthalate film with an easy-adhesion layer (trade name: PET100O300E, thickness 100 μm, manufactured by Mitsubishi Plastics) was used as the base film instead of the triacetylcellulose film. 3 scattering prevention film was obtained.

“Comparative Example 4”
The scattering prevention film of the comparative example 4 was obtained like the comparative example 3 except having used the adhesive containing composition 2 instead of the adhesive containing composition 1 as an adhesive layer.

“Comparative Example 5”
Comparative Example 5 was performed in the same manner as in Example 1 except that a polycarbonate film (trade name: Pure Ace C110-75, thickness 75 μm, manufactured by Teijin Chemicals Ltd.) was used instead of the triacetylcellulose film as the base film. An anti-scattering film was obtained.

“Comparative Example 6”
A scattering prevention film of Comparative Example 6 was obtained in the same manner as Comparative Example 5 except that the adhesive-containing composition 2 was used instead of the adhesive-containing composition 1 as the adhesive layer.

"Evaluation"
About each scattering prevention film of Examples 1-8 and Comparative Examples 1-6, evaluation of six items of total light transmittance, a haze, a refractive index, an external appearance, scattering prevention property, and luminous reflectance is based on the following method. went.
(1) Total light transmittance In accordance with Japanese Industrial Standard JIS K7361-1-1997 “Plastic—Testing method of total light transmittance of transparent material”, using a haze meter (trade name: NDH2000, manufactured by Nippon Denka Co., Ltd.) The total light transmittance (%) of the scattering prevention films obtained in Examples and Comparative Examples was measured.
The evaluation results are shown in Table 1.

(2) Haze In accordance with Japanese Industrial Standard JIS K7136-2000 “Plastics—Testing method of total light transmittance of transparent material”, using a haze meter (trade name: NDH2000, manufactured by Nippon Denshoku Co., Ltd.), Examples and Comparison The haze (%) of the anti-scattering film obtained in the example was measured.
The evaluation results are shown in Table 1.

(3) Refractive index With respect to the hard coat layer, base film and pressure-sensitive adhesive layer used in Examples and Comparative Examples, multi-wavelength Abbe refraction in accordance with Japanese Industrial Standard JIS K7142-2008 "Plastics-Determination of Refractive Index" Using a rate meter (trade name: DR-M2, manufactured by Atago Co., Ltd.), the refractive indexes of the hard coat layer, the base film and the adhesive layer at a wavelength of 589 nm were measured.
The evaluation results are shown in Table 1.

(4) Appearance After a scattering prevention film is bonded to a glass plate having a thickness of 1 mm, a distance of 1 m from one surface (surface on which a hard coat layer is provided) of the base film constituting the scattering prevention film is set. Then, a three-wavelength fluorescent lamp was arranged, the light emitted from the fluorescent lamp was irradiated onto the anti-scattering film, and the color of the reflected light on the other surface of the base film was visually observed.
When the color of the reflected light on the other surface of the base film is equivalent to the color of the reflected light on one surface of the glass plate by the same light source, the color of the reflected light on the other surface of the base film is When it was different from the color of the reflected light on one surface of the glass plate by the same light source, it evaluated as x.
The evaluation results are shown in Table 1.

(5) Anti-scattering properties After the anti-scattering film is bonded to a glass plate having a length of 150 mm, a width of 170 mm, and a thickness of 1 mm, a laminate composed of the glass plate and the anti-scattering film is scattered on a 10 mm high table. Arranged so that the prevention film faces upward (the direction opposite to the above-mentioned base), and a portion (one end) of 10 mm from one end in the long side direction of this laminate is in an arched state. An iron ball having a diameter of 31.75 mm was dropped from a height of 30 cm to the part, and the scattering state of the glass was visually observed.
When the scattering prevention film was not torn, it was evaluated as “good”, and when the scattering prevention film was torn, it was evaluated as “x”.
The evaluation results are shown in Table 1.

(6) Luminous reflectance Using a spectrophotometer (trade name: UV-3600, manufactured by Shimadzu Corporation), one surface of the base film constituting the anti-scattering film (surface on which the hard coat layer is provided) ), The luminous reflectance (%) of light in the ultraviolet, visible, and near infrared (UV-VIS-NIR) region was measured.
In this measurement of luminous reflectance, a scattering prevention film is attached to a glass plate (trade name: Corning Glass XG, manufactured by NSG Precision Co., Ltd.), and the reflection spectrum on the scattering prevention film side is spectrophotometric. The L ^* a ^* b ^* color system was converted to an xy color system.
For comparison, the luminous reflectance of only the above glass plate was measured as a reference example.
The evaluation results are shown in Table 2.

From the results of Table 1, the scattering prevention films of the examples have a refractive index of the film base of 1.49 and a refractive index of the pressure-sensitive adhesive layer of 1.45 to 1.49. Therefore, the total light transmittance, haze and It was found that the anti-scattering property was excellent in appearance while being equivalent to the anti-scattering films of Comparative Examples 1-6.
Moreover, from the results of Table 2, it was found that the anti-scattering film of the example can suppress reflection of red light (interference color) in the L ^* a ^* b ^* color system as compared with the comparative example.

11 Base film 12 Adhesive layer 100, 110, 120 Anti-scattering film for image display device (anti-scattering film)
130 Image display device 31 Image display panel 32 Adhesive layer 33 for conductive film Conductive glass substrate 34 Glass substrate 35 Transparent conductive film 21 Release sheet 41 Separation line 13 Hard coat layer 200, 210, 220 Anti-scattering film for image display device ( Anti-scattering film)
230 Image display device

Claims (5)

 A base film composed of a triacetyl cellulose film having a refractive index of 1.45 to 1.55, and an adhesive layer having a refractive index of 1.45 to 1.55 provided on at least one surface of the base film; An anti-scattering film for an image display device, comprising:  2. The hard coat layer having a refractive index of 1.45 to 1.55 is provided on a surface opposite to the surface in contact with the pressure-sensitive adhesive layer of the base film. Anti-scattering film for image display devices.  The luminous reflectance of light having a wavelength of 380 to 780 nm on the surface opposite to the surface in contact with the pressure-sensitive adhesive layer of the base film is 8.5% or less. 2. An anti-scattering film for an image display device according to 2.  The scattering prevention film for an image display device according to any one of claims 1 to 3, wherein the film is used for a display screen of a portable information terminal device. An image display device comprising: an image display panel; a glass substrate disposed on a display unit of the image display panel; and the anti-scattering film for an image display device according to claim 1. And
The scattering prevention film for an image display device is attached to the surface of the glass substrate opposite to the surface facing the image display panel by the adhesive layer provided on one surface of the base film. An image display device characterized by being worn.

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