JP4074096B2 - Antireflection film for transfer, method for producing the same, and object subjected to antireflection treatment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antireflection film for transfer and a method for producing the same. The antireflection film for transfer of the present invention is used when an antireflection layer is formed on a target object surface to be antireflection treated by transfer. The present invention also relates to an object subjected to an antireflection treatment using the transfer antireflection film.
[0002]
Target objects that should be anti-reflective include low-flexibility objects or supports such as plates that are difficult to form a uniform-thickness coating layer, objects such as glass and ceramics, resin films, sheets, and plates. It is. For example, the surface of a display element typified by a CRT, LCD, rear projector screen, or electroluminescence display is required to have antireflection treatment, and is a specific example of a target object.
[0003]
[Prior art]
Conventionally, the antireflection treatment on the CRT surface or the like has been performed by sputtering, spin coating, or the like, but these are performed by a single wafer method, and thus productivity is poor. For this reason, the antireflection film is not directly applied to the CRT surface and the like, but the antireflection film is continuously produced efficiently by roll-to-roll using the flexible film as a support, and the antireflection film is used to produce the CRT. Anti-reflection treatment on the surface and the like has been performed.
[0004]
Japanese Patent Application Laid-Open No. 7-225302 discloses laminating an antireflection film on the surface of an object. However, according to the publication, the support film of the antireflection film exists on the surface of the object, and the antireflection layer exists on the support. The presence of the support film causes adverse effects such as a decrease in surface hardness, an increase in haze, a decrease in light transmittance, and an increase in the total film thickness of the surface coating. These adverse effects are important problems on the surface of a display element typified by CRT.
[0005]
JP-A-2000-338306 discloses a siloxane-based resin layer as a low refractive index layer on a base film surface having releasability, and a metal oxide-containing layer as a high refractive index layer thereon, An antireflection antistatic plate transfer material having an adhesive layer thereon is disclosed. However, the manufacturing method has not been studied in detail.
[0006]
[Problems to be solved by the invention]
From such a background, an antireflection layer having a uniform thickness can be easily and well formed on the surface of the object by transfer, and can be applied to an object surface with poor flexibility such as a plate material, particularly a display element surface. An object of the present invention is to provide an antireflection film for transfer and a method for producing the same, in which a low refractive index layer and a high refractive index layer constituting an antireflection layer can be uniformly formed by coating and the production efficiency is high.
[0007]
[Means for Solving the Problems]
As a result of intensive studies, the present inventor has found that the above object is achieved by providing the low refractive index layer by applying and curing an ultraviolet curable hard coat agent, and has reached the present invention.
[0009]
  The present invention relates to an antireflection comprising a support, a low refractive index layer provided on the support, and a high refractive index layer having a refractive index higher than that of the low refractive index layer provided on the low refractive index layer. A low-refractive index layer is an ultraviolet curable hard coat layer, and the support is peelable from the antireflection layer. Antireflection filmBecause
  The physical film thickness of the low refractive index layer is 0.05 μm or more and less than 0.5 μm,
  The high refractive index layer is a layer containing metal oxide fine particles, and the physical film thickness of the high refractive index layer is 0.05 μm or more and less than 0.5 μm,
  Antireflection film for transfer in which the adhesive is impregnated in the high refractive index layerIt is.
[0011]
The present invention is the above-mentioned antireflection film for transfer, in which a separator is provided on the adhesive layer.
[0012]
  In addition, the present invention is a method of applying a UV curable hard coating agent coating solution on a support, drying, curing by UV irradiation,Physical film thickness is 0.05μm or more and less than 0.5μmForming a low refractive index layer so as to be peelable from the support;
  On the low refractive index layerContains metal oxide fine particlesHigh refractive index layer coating solution is applied and dried to have a refractive index higher than that of the low refractive index layerPhysical film thickness is 0.05μm or more and less than 0.5μmForming a high refractive index layer;
  An adhesive layer is formed on the high refractive index layerAnd impregnating the adhesive into the high refractive index layerA process for producing an antireflection film for transfer.
[0014]
This invention is the manufacturing method of the said anti-reflective film for transfer which performs the formation process of a high refractive index layer continuously, without winding up after the formation process of a low refractive index layer.
[0015]
In the adhesive layer forming step, the present invention applies an adhesive coating solution on the high refractive index layer and dries to form an adhesive layer, and then, if necessary, provides a separator on the adhesive layer. It is a manufacturing method of the said antireflection film for transfer.
[0016]
In the present invention, in the adhesive layer forming step, an adhesive coating solution is applied on the separator and dried to form an adhesive layer, and then the adhesive layer is laminated on the high refractive index layer to form the adhesive layer. This is a method for producing the above-described antireflection film for transfer.
[0017]
Furthermore, the present invention is an object subjected to antireflection treatment, wherein the antireflection layer of any one of the above antireflection films for transfer is provided on the surface by transfer via an adhesive layer.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a layer configuration example of an antireflection film for transfer according to the present invention. FIG. 2 is a cross-sectional view showing another layer configuration example of the antireflection film for transfer of the present invention. FIG. 3 is a cross-sectional view showing an example of the layer structure of an antireflection treated object in which an antireflection layer of the antireflection film for transfer of the present invention is provided on the surface by transfer. In addition, said transfer means sticking the antireflection layer on a support body to another object through an adhesive bond layer.
[0019]
In the antireflection film for transfer shown in FIG. 1, an antireflection layer (2) is provided on the support (1), and an adhesive layer (3) is provided on the antireflection layer (2). The antireflection layer (2) is composed of a low refractive index layer (2a) on the support (1) and a high refractive index layer (2b) on the low refractive index layer (2a). ) And the high refractive index layer (2b) have different refractive indexes. When the antireflection layer (2) is transferred from the support (1) to the surface of the target object to be antireflected, the support (1) can be peeled from the antireflection layer (2). In the antireflection film for transfer shown in FIG. 2, a separator (5) is further provided on the adhesive layer (3).
[0020]
The adhesion between the separator (5) and the adhesive layer (3) is smaller than the adhesion between the other layers. By adopting such a configuration, only the separator (5) can be peeled off when the separator (5) is peeled off. Further, as described later, after the separator (5) is peeled off and applied to the surface of the target object to be antireflection treated through the adhesive layer (3), and further the adhesive layer is cured, the support (1) And the low-refractive index layer (2a) have a smaller adhesive force than the other layers. With such a configuration, only the support (1) can be peeled off, and the antireflection layer (2) can be transferred to the surface of the target object.
[0021]
Whether the refractive index is high or low is relative when the refractive indexes of the high refractive index layer and the low refractive index layer are compared. With such a layer configuration of the antireflection layer (2), when the antireflection layer (2) is transferred from the support (1) to the surface of the target object, the support (1) is peeled off and low refractive index is obtained. The rate layer (2a) is located on the outermost side of the target object surface, and the antireflection effect is improved.
[0022]
1 and 2 show an example in which the antireflection layer (2) is composed of two layers of a low refractive index layer (2a) and a high refractive index layer (2b). The present invention also includes an antireflection film for transfer in which the antireflection layer (2) is constituted as follows.
A film in which the antireflection layer (2) is a single layer of the low refractive index layer (2a).
The antireflective layer (2) is higher than the refractive index of the low refractive index layer (2a) between the low refractive index layer (2a) and the high refractive index layer (2b), and the high refractive index layer (2b). A film having a middle refractive index layer having a refractive index lower than the refractive index of.
・ An antireflection layer (2) is formed on the high refractive index layer (2b) on the low refractive index layer (2a) shown in FIG. 1 or 2, and the refractive index of the high refractive index layer (2b). A film having a medium refractive index layer or a low refractive index layer having a lower refractive index.
[0023]
The support (1) is not particularly limited, and a flexible resin film is suitable. The resin film is lightweight and easy to handle. Examples of the resin film include polyester films such as polyethylene terephthalate (PET), polyolefin films such as polyethylene and polypropylene, polycarbonate films, acrylic films, norbornene films (manufactured by JSR Corporation, Arton, etc.), and the like. In addition to the resin film, cloth, paper, or the like can be used as the support. Moreover, it is preferable to use a resin film, cloth, paper or the like whose surface is treated with a release agent.
[0024]
In the present invention, first, an ultraviolet curable hard coating agent coating solution is applied onto a long support (1), dried, and cured by ultraviolet irradiation to form a low refractive index layer (2a) on the support (1). And is formed so as to be peelable. That is, the low refractive index layer (2a) is an ultraviolet curable hard coat layer. When the antireflection layer (2) is transferred from the support (1) to the surface of the target object, the hard coat layer is located on the outermost side of the surface of the target object, and an anti-reflection effect and a scratch resistance effect are obtained.
[0025]
The ultraviolet curable hard coat agent coating solution is a solution obtained by dissolving an ultraviolet curable hard coat agent in a solvent as necessary. The hard coat agent is not particularly limited, and various known ultraviolet curable hard coat agents can be used. For example, an ultraviolet curable hard coat agent such as an unsaturated polyester resin-based or acrylic-based radical polymerizable hard coat agent or an epoxy-based or vinyl ether-based cationic polymerizable hard coat agent is used. Among these, in view of curing reactivity and surface hardness, an acrylic radical polymerizable hard coating agent is desirable.
[0026]
The hard coat agent coating solution may be applied onto the support (1) by a known method such as a roll coater such as a gravure or reverse roll, a Mayer bar, or a slit die coater. After coating, it is dried, and then cured by irradiation with ultraviolet rays. Drying may be performed, for example, in an appropriate temperature range of about 40 to 100 ° C. for 10 seconds to 5 minutes. Ultraviolet irradiation is performed using a lamp such as a xenon lamp, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a metal halide lamp, a carbon arc lamp, a tungsten lamp, etc.²It is good to irradiate to some extent.
[0027]
The ultraviolet curable hard coat agent is preferable from the viewpoint of manufacturability. That is, when an ultraviolet curable hard coat agent is used as the low refractive index layer (2a), the coating, drying, and curing can be performed without winding, and the curing reactivity is good and high production efficiency is obtained. When a thermosetting hard coat agent is used as the low refractive index layer, it is necessary to wind up once after coating and drying, and to perform a thermosetting reaction (for example, about 70 ° C. for about 48 hours) in a roll state, resulting in low production efficiency. Become. In addition, since thermosetting is performed in the roll state, the planarity of both side portions of the roll may be impaired by heat, and the high refractive index layer on the low refractive index layer may not be formed with a uniform film thickness. . Furthermore, when thermosetting is performed in the roll state, in the portion close to the winding core, minute irregularities on the back surface of the support may be transferred to the surface of the low refractive index layer. When an ultraviolet curable hard coat agent is used as the low refractive index layer (2a), there is no such harmful effect when a thermosetting hard coat agent is used.
[0028]
Furthermore, when an ultraviolet curable hard coat agent is used as the low refractive index layer (2a), after the low refractive index layer is cured, the next step of forming the high refractive index layer is performed continuously without winding. And higher production efficiency can be obtained.
[0029]
  The refractive index of the low refractive index layer (2a) is, for example, 1.35 or more and less than 1.6. Physical thickness of low refractive index layer (2a)Is 0. 05μm or more and less than 0.5μmAnd goodIt is preferably 0.07 μm or more and 0.2 μm or less. In this way, the low refractive index layer (2a) is formed.
[0030]
Next, in the present invention, a high refractive index layer having a refractive index higher than that of the low refractive index layer is obtained by applying and drying a coating solution for the high refractive index layer on the formed low refractive index layer (2a). Form.
[0031]
  The coating solution for the high refractive index layer is one in which a high refractive index layer having a refractive index higher than that of the low refractive index layer (2a) is formed.TheContains metal oxide fine particlesIs a thing. Examples of the metal oxide fine particles include fine particles having a high refractive index such as tin oxide, zinc oxide, titanium oxide, and zirconium oxide, and high refractive indexes such as antimony-doped tin oxide (ATO) and tin-doped indium oxide (ITO). There may be mentioned conductive fine particles. The high refractive index is, for example, a refractive index of 1.60 or more. The average particle size of these fine particles is preferably 10 to 30 nm. Further, the refractive index may be adjusted by using a plurality of these materials.
[0032]
It is also preferable that the metal oxide fine particles for the high refractive index layer are surface-treated with a compound having a crosslinkable functional group. The crosslinkable functional group is not particularly limited, and is an unsaturated double bond such as a vinyl group, an acrylic group, or a methacryl group, an epoxy group, or a hydroxyl group. Examples of the compound having an unsaturated double bond such as a vinyl group or a (meth) acryl group include a silane coupling agent having such an unsaturated double bond. More specifically, for example, divinyldimethoxysilane, divinyldi-β-methoxyethoxysilane, vinyltriethoxysilane, vinyltris-β-methoxyethoxysilane, γ- (meth) acryloxypropyltrimethoxysilane, γ- (meth) Examples include acryloxypropyltriethoxysilane and γ- (meth) acryloxypropylmethyldiethoxysilane.
[0033]
The surface treatment of the metal oxide fine particles with such a silane coupling agent can be performed, for example, by stirring both at room temperature in an alcohol such as methanol. It is considered that the alkoxy group of the silane coupling agent is hydrolyzed to form a bond between a hydroxyl residue on the surface of the metal oxide fine particle and Si.
[0034]
Moreover, as a compound which has unsaturated double bonds, such as a (meth) acryl group, (meth) acrylic acid and its ester compound are mentioned, for example. More specifically, examples include (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, and the like.
[0035]
Such surface treatment of the metal oxide fine particles with (meth) acrylic acid or (meth) acrylate can be performed by stirring both at room temperature in an alcohol such as methanol. It is considered that a (meth) acryloyl group is introduced into a hydroxyl residue on the surface of the metal oxide. Further, it is considered that even if an acid halide such as (meth) acrylic acid chloride is allowed to act on the metal oxide fine particles, a (meth) acryloyl group is introduced on the surface of the metal oxide.
[0036]
When the metal oxide fine particles are surface-treated and there are crosslinkable functional groups on the fine particle surface, when an ultraviolet curable acrylic adhesive or an ultraviolet curable epoxy adhesive is used for the adhesive layer (3), The high refractive index layer (2b) is impregnated with the ultraviolet curable monomer component contained in the adhesive layer (3), and causes a crosslinking reaction with the crosslinkable functional group by ultraviolet irradiation. When a thermosetting adhesive is used for the adhesive layer (3), the high refractive index layer (2b) is impregnated with the thermosetting adhesive component contained in the adhesive layer (3) and heated. Causes a crosslinking reaction with the crosslinkable functional group. Therefore, strong film strength and high adhesion can be obtained.
[0037]
If the crosslinkable functional group is an unsaturated double bond such as a vinyl group, an acrylic group, or a methacryl group, the acrylic monomer component contained in the ultraviolet curable acrylic adhesive reacts with the unsaturated double bond. To crosslink. If the crosslinkable functional group is an epoxy group, it is bonded to the ultraviolet curable epoxy adhesive component by cationic polymerization.
[0038]
If the crosslinkable functional group is a hydroxyl group, it is crosslinked by an urethane component by a thermosetting reaction with the isocyanate component of the isocyanate adhesive. Moreover, it crosslinks with the silanol group of a silicone type adhesive agent and the siloxane bond by thermosetting reaction.
[0039]
The coating solution for the high refractive index layer is prepared by dispersing the metal oxide fine particles in a solvent such as an organic solvent. At this time, a binder resin may be used, but it is preferable not to use it. When a binder resin is used, the amount of the binder resin is suitably 25% by weight or less, preferably 20% by weight or less, based on the total of the binder resin and the fine particles.
[0040]
The application of the coating solution for the high refractive index layer onto the low refractive index layer (2a) may be performed by a known method such as a roll coater such as a gravure or reverse roll, a Mayer bar, or a slit die coater. The drying after the application may be performed, for example, in an appropriate temperature range of about 40 to 120 ° C. for 10 seconds to 5 minutes.
[0041]
In the present invention, after the formation of the low refractive index layer (2a), the high refractive index layer can be continuously formed on the low refractive index layer (2a) without winding. In this case, higher production efficiency can be obtained.
[0042]
It is also preferable to compress the high refractive index layer (2b) after coating and drying. For example, when conductive fine particles such as ATO are used as the metal oxide fine particles, the conductivity of the high refractive index layer (2b) is improved by compression.
[0043]
  The refractive index of the high refractive index layer (2b) is, for example, 1.6 or more and 2.5 or less. Physical thickness of high refractive index layer (2b)Is 0. 05μm or more and less than 0.5μmAnd goodIt is preferably 0.06 μm or more and 0.2 μm or less. In this way, the high refractive index layer (2b) is formed.
[0044]
Next, in the present invention, an adhesive layer (3) is formed on the formed high refractive index layer (2b). Formation of the adhesive layer (3) can be performed by applying and drying an adhesive coating solution on the high refractive index layer (2b), and then, if necessary, a separator (3) on the adhesive layer (3). 5) may be provided to protect the adhesive layer surface until use. Also, an adhesive coating solution is applied on the separator (5) and dried to form an adhesive layer, and then the adhesive layer is laminated on the high refractive index layer (2b) to form an adhesive layer (3). May be.
[0045]
By forming the adhesive layer (3), the antireflection layer (2) can be easily transferred onto the target object via the adhesive layer. The thickness of the adhesive layer (3) is 1 to 100 μm, preferably 3 to 20 μm.
[0046]
For the adhesive layer (3), an ultraviolet curable adhesive and / or a thermosetting adhesive layer containing an ultraviolet curable monomer component is used. Any known adhesive can be used as long as it has an affinity for both the antireflection layer (2) of the antireflection film and the surface of the object to be transferred, and can adhere both strongly. An agent can be used. Examples include acrylic adhesives, epoxy adhesives, isocyanate adhesives, silicone adhesives, and the like. Among these, the ultraviolet curable adhesive is preferable in terms of curing reactivity, hardness, and cost.
[0047]
The UV curable adhesive used for the adhesive layer (3) has a tack feeling just by applying an adhesive solution and drying it, and an extremely low fluidity adhesive layer is obtained. An adhesive that can be hardened by UV curing of the adhesive layer after pasting is preferred. Softening or deterioration of the adhesive layer after being stuck and cured on the object to be transferred is not preferable. The tackiness makes it easy to attach to the object to be transferred. In addition, since the fluidity is very low, it is possible to provide a separator film for protecting the adhesive layer from the time when the adhesive layer is provided to the time of application.
[0048]
From this point of view, the following ultraviolet curable acrylic adhesive composition is preferable as the adhesive used for the adhesive layer (3) of the antireflection film.
1. An adhesive composition comprising an acrylic resin component (P) having a glass transition temperature Tg of 30 ° C. or higher and a curable acrylic monomer component (M) at a weight ratio P / M = 8/2 to 2/8.
2. The adhesive composition according to 1 above, wherein the acrylic resin component (P) is solid at room temperature and the curable acrylic monomer component (M) is liquid at room temperature.
3. Furthermore, the said 1 or 2 adhesive composition containing a photoinitiator.
[0049]
Examples of the acrylic component include acrylic resin 103B and 1BR-305 (manufactured by Taisei Kako Co., Ltd.). Examples of the curable acrylic monomer component include tri- or higher functional acrylic monomers such as KAYARAD GPO-303, KAYARAD TMPTA, and KAYARAD THE-330 (all manufactured by Nippon Kayaku Co., Ltd.). Various photopolymerization initiators can be used, and examples thereof include KAYACURE DETX-S (manufactured by Nippon Kayaku Co., Ltd.). Moreover, SD-318 (made by Dainippon Ink and Chemicals) is mentioned as a thing containing a sclerosing | hardenable acrylic monomer component and a photoinitiator component. When curing with visible light, a photosensitizer may be added.
[0050]
When the antireflection film for transfer has the ultraviolet curable adhesive layer (3) on the high refractive index layer (2b), at least the ultraviolet curable monomer component contained in the ultraviolet curable adhesive is the high refractive index layer (2b). Impregnated inside. When the metal oxide fine particles contained in the high refractive index layer (2b) are surface-treated with a compound having a crosslinkable functional group, the impregnated ultraviolet curable monomer component is irradiated with ultraviolet rays, It reacts and bonds with the crosslinkable functional group present on the surface of the metal oxide fine particles. As a result, in the high refractive index layer (2b), this bond acts as a crosslinking point and the crosslinking density increases, so that the hardness of the high refractive index layer (2b) after ultraviolet irradiation increases, and the high refractive index layer (2b) ) And the adhesive layer (3) are also improved. In the present invention, even if the dispersion of metal oxide fine particles used in the formation of the high refractive index layer (2b) has a small amount of binder resin or no binder resin, as described above, High hardness of the high refractive index layer (2b) and high adhesion between the high refractive index layer (2b) and the adhesive layer (3) are obtained.
[0051]
Further, when the adhesive is impregnated in the high refractive index layer (2b) and reaches the low refractive index layer (2a), the high refractive index layer (2b) and the low refractive index layer (2a) The overall hardness and adhesion of the adhesive layer and the antireflection layer after transfer are also improved. This effect can be obtained when the high refractive index layer (2b) does not contain a binder resin and the film thickness is 2 μm or less. In addition, when the binder resin is included as described above, it is easy to obtain when the film thickness is less than 0.5 μm, and when the film thickness of the high refractive index layer (2b) is 0.2 μm or less, growing.
[0052]
The refractive index of the adhesive layer (3) after transfer curing is preferably close to the refractive index of the object to be transferred. If the difference in refractive index between the two is large, new reflected light may be generated at the interface between the two.
[0053]
Furthermore, pigments, pigments, etc. may be dispersed or dissolved in the adhesive layer. The pigment may be selected from known scratch-resistant materials such as silica and inorganic materials for coloring.
[0054]
As described above, the antireflection film for transfer of the present invention is obtained.
Next, with reference to FIG. 3, a method for performing an antireflection treatment on a target object to be subjected to the antireflection treatment using the antireflection film for transfer of the present invention will be described.
[0055]
FIG. 3 is an example of a layer structure of an antireflection-treated object obtained by using the antireflection film for transfer shown in FIG. 1 or 2, and an adhesive layer (4) is formed on the surface of the target object (4) to be antireflection-treated. FIG. 3 is a cross-sectional view showing a layer configuration example provided with an antireflection layer (2) through 3C). The adhesive layer (3C) is cured.
[0056]
The object (4) to be subjected to the antireflection treatment is not particularly limited and includes various objects. For example, an object or support having poor flexibility such as a plate material in which it is difficult to form a coating layer having a uniform thickness, an object such as glass or ceramics, a resin film, a sheet, or a plate is included. For example, the surface of a display element typified by a CRT, LCD, rear projector screen, or electroluminescence display is required to have antireflection treatment, and is a specific example of a target object.
[0057]
The antireflection film for transfer of the present invention is attached to the surface of the target object (4) to be antireflection treated through an adhesive layer (3) so that the support (1) is on the outside. In the case where the adhesive layer (3) is an ultraviolet curable adhesive, after bonding, the adhesive layer (3) is cured by ultraviolet irradiation (3C), the support (1) is peeled off, and the target object ( 4) An antireflection layer (2) is formed on the surface. Ultraviolet rays are effective as the exposure light. The exposure time is appropriately selected depending on the photosensitive characteristics of the used ultraviolet curable resin composition and the type of light beam.
[0058]
When the adhesive layer (3) is a thermosetting adhesive, after bonding, the adhesive layer (3) is cured by heating (3C), the support (1) is peeled off, and the target object (4 ) An antireflection layer (2) is formed on the surface.
[0059]
【Example】
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the examples.
[0060]
[Example 1]
As shown in FIG. 2, a transfer having a low refractive index layer (2a), a high refractive index layer (2b), an ultraviolet curable adhesive layer (3) and a separator (5) in this order on a support (1). An antireflection film was prepared.
[0061]
(Formation of a low refractive index layer)
Nippon Kayaku's acrylic UV curable resin KAYANOVA FOP1700 (solid content concentration 80% by weight) was diluted with a solvent (methyl ethyl ketone / toluene = 2/1) to obtain a solid content concentration of 40% by weight to obtain a low refractive index layer coating solution. . This coating solution was applied onto a 38 μm-thick long release PET film (1) # 43 (manufactured by Teijin DuPont Film), dried at 70 ° C. for 1 minute, and irradiated with ultraviolet rays (irradiation amount: 500 mJ / cm²) Cured to form a low refractive index layer (2a) having a thickness of 0.09 μm.
[0062]
(Formation of high refractive index layer)
Antimony-doped tin oxide (ATO) ultrafine particles having an average primary particle size of about 10 nm are subjected to surface treatment with a silane coupling agent containing a vinyl group. Ethanol dispersion (catalyst conversion Co., Ltd., solid content concentration: 20% by weight) 90 parts by weight and ethanol dispersion of fine particles obtained by surface-treating ultrafine titanium oxide particles having an average primary particle size of about 10 nm with a silane coupling agent containing a vinyl group (catalyst conversion Co., Ltd., solid content concentration 15% by weight) 350 parts by weight of ethanol was added to the mixed solution with 40 parts by weight to obtain a high refractive index layer coating solution. The obtained coating solution was applied on the low refractive index layer (2a) and dried to form a high refractive index layer (2b) having a thickness of 0.09 μm.
[0063]
(Formation of adhesive layer)
UV curing type hard coat agent (main component: acrylic monomer) UVHC-1105 (manufactured by GE Toshiba Silicone) 100 parts by weight of acrylic resin 1BR-305 (manufactured by Taisei Kako Co., Ltd., solid concentration 39. 5 wt%) 84 parts by weight and 149 parts by weight of methyl ethyl ketone (MEK) were added to obtain an adhesive layer coating solution. This coating solution was applied onto a separator (5) S314 (manufactured by Teijin DuPont Film) and dried to form an adhesive layer, which was laminated with the high refractive index layer (2b) with a laminator. Since the adhesive force between the high refractive index layer (2b) and the separator (5) is weaker than the adhesive force between the peeled PET film (1) # 43 and the low refractive index layer (2a), a part of the separator (5) When peeled off, only the separator (5) was peeled off, and a 5 μm thick adhesive layer (3) was formed on the high refractive index layer (2b). When the adhesive layer was touched with a finger, there was a feeling of tack. . An antireflection film for transfer was obtained as described above.
[0064]
[Example 2]
The transfer is performed in the same manner as in Example 1 except that the high refractive index layer coating solution is continuously applied and dried on the low refractive index layer (2a) without winding after the formation of the low refractive index layer (2a). An antireflection film was obtained.
[0065]
In Example 1, since the thermosetting is not performed after the formation of the low refractive index layer, there is no transfer of minute unevenness and deformation of both sides of the roll even in the portion close to the roll core, and the high refractive index layer is good. Could be formed. Moreover, in Example 2, since the winding was not performed after the formation of the low refractive index layer, the same effect was obtained.
[0066]
【The invention's effect】
According to the present invention, an antireflection layer having a uniform thickness can be applied to a surface of an object having poor flexibility such as a plate material by transfer, particularly a display element surface, and the antireflection for transfer excellent in the antireflection effect of light in the visible light region. Films and methods for making the same are provided.
[0067]
In particular, according to the present invention, since an ultraviolet curable hard coat agent is used as the low refractive index layer, an antireflection film for transfer is produced with good curing reactivity, high production efficiency and stable quality.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a layer structure of an antireflection film for transfer according to the present invention.
FIG. 2 is a cross-sectional view showing another layer configuration example of the antireflection film for transfer of the present invention.
FIG. 3 is a cross-sectional view showing an example of a layer structure of an antireflection treated object in which an antireflection layer of an antireflection film for transfer of the present invention is provided on a surface by transfer.
[Explanation of symbols]
(1): Support
(2): Antireflection layer
(2a): Low refractive index layer
(2b): High refractive index layer
(3): Adhesive layer
(3C): Hardened adhesive layer
(4): Target object
(5): Separator

Claims (7)

An antireflection layer comprising a support, a low refractive index layer provided on the support, and a high refractive index layer having a refractive index higher than that of the low refractive index layer provided on the low refractive index layer; and an adhesive layer provided on the barrier layer, the low refractive index layer is a UV-curable hard coat layer, and the support is in the transfer antireflection film can be peeled off from the anti-reflective layer There,
The physical film thickness of the low refractive index layer is 0.05 μm or more and less than 0.5 μm,
The high refractive index layer is a layer containing metal oxide fine particles, and the physical film thickness of the high refractive index layer is 0.05 μm or more and less than 0.5 μm,
An antireflection film for transfer, wherein the adhesive is impregnated in the high refractive index layer. The antireflection film for transfer according to claim 1 , wherein a separator is provided on the adhesive layer. A UV curable hard coating agent coating solution is applied onto a support, dried and cured by UV irradiation, and the low refractive index layer having a physical film thickness of 0.05 μm or more and less than 0.5 μm is peeled off from the support. A process that can be formed;
A coating film for high refractive index layer containing metal oxide fine particles is applied onto the low refractive index layer and dried to have a physical film thickness of 0.05 μm or more having a refractive index higher than that of the low refractive index layer. Forming a high refractive index layer of less than 0.5 μm ;
Forming an adhesive layer on the high refractive index layer and impregnating the adhesive into the high refractive index layer . The method for producing an antireflective film for transfer according to claim 3 , wherein the step of forming the high refractive index layer is continuously performed without winding after the step of forming the low refractive index layer. In the step of forming the adhesive layer, applying an adhesive coating solution for high refractive index layer and dried to form an adhesive layer, then optionally provided separator on the adhesive layer, according to claim 3 or 4. A method for producing an antireflection film for transfer according to 4 . In the step of forming an adhesive layer, the adhesive coating liquid is applied on the separator and dried to form an adhesive layer, and then the adhesive layer is laminated on the high refractive index layer to form the adhesive layer. A method for producing an antireflection film for transfer according to 3 or 4 . An antireflection-treated object, wherein the antireflection layer of the antireflection film for transfer according to claim 1 or 2 is provided on the surface by transfer via an adhesive layer.

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