JP2002207104A - Antireflection member, method for producing the same and antireflection transfer material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antireflection member having a significant antireflection effect, a method for producing the member and an antireflection transfer material. SOLUTION: The antireflection member has a significant antireflection effect because two antireflection constitutive layers having a rugged shape at the interface between those are stacked on a part of a transparent substrate forming a transparent window. The antireflection member having a significant antireflection effect is easily obtained because a transfer material obtained by forming at least two antireflection constitutive layers having a rugged shape at the interface between those on a base sheet is set in a metallic mold in such a way that the base sheet comes in contact with the cavity surface, a transparent molten resin is injected into the mold to obtain an integrated combination of a transparent substrate comprising the resin and the transfer material and then the base sheet is peeled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a portable telephone, a video camera, a digital camera, an automobile device, a PDA (P
personal Digital Assistan
t), monitors for personal computers, electronic paper as electronic devices for display that are light and thin and flexible like paper, various displays such as televisions, various electronic devices such as electronic devices for outdoor signage, and various types of devices other than electronic devices. Display members,
An anti-reflection member used to allow a display (a member having a function as a display screen) located behind, such as an outdoor display panel, a picture frame, a picture frame, a clock, a window glass, etc. to be seen through, and its manufacture. A method and an antireflection transfer material.

[0002]

2. Description of the Related Art In a mobile phone, a video camera, a digital camera, an automobile device, etc., a display portion is
It is configured by a combination with a liquid crystal panel or an organic EL panel. The display portion is covered with a cover component made of a transparent base material on which a pattern such as a border is formed for the purpose of preventing damage to the liquid crystal panel and decorating the vicinity of the liquid crystal panel.

[0003] The transparent window portion of the cover member is generally obtained by forming a primer layer or a hard coat layer on a transparent base material and forming a low reflection layer thereon.

[0004]

However, it is difficult to form the surface of the primer layer or the hard coat layer of the cover part obtained by such a method smoothly, so that irregular reflection occurs at the interface with the low reflection layer. This causes a problem that the screen of the liquid crystal panel located on the back surface of the cover member may be difficult to see (see FIG. 6).

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an anti-reflection member having an excellent anti-reflection effect, a method of manufacturing the same, and an anti-reflection transfer material, which solve the above-mentioned drawbacks.

[0006]

An anti-reflection member and a method of manufacturing the same according to the present invention have the following constructions to achieve the above object.

That is, the anti-reflection member of the present invention is configured such that two anti-reflection constituent layers whose interfaces are uneven are laminated on a portion to be a transparent window of a transparent base material. did.

In the above invention, the unevenness may be configured to have an average surface roughness of 0.2 to 1.0 μm.

Further, in the above invention, the upper layer of the antireflection constituent layer may be made of a thermosetting resin, an ultraviolet curable resin or an electron beam curable resin.

In the above invention, a low reflection layer may be laminated on the antireflection constituent layer.

Further, in the above invention, an antifouling layer may be laminated on the low reflection layer.

Further, in the above-mentioned invention, a design layer may be formed in a portion other than a portion to be a transparent window portion.

Further, the method for manufacturing an antireflection member according to the present invention is characterized in that a transfer material having at least two antireflection constituent layers each having an uneven shape at the mutual interface on a base sheet is formed on the cavity surface. Set in a mold so as to be in contact with it, inject a transparent molten resin into the mold to obtain an integrated product of a transparent base material made of resin and a transfer material, and then peel off the base sheet from the integrated product did.

Further, in the above invention, the unevenness may be configured to have an average surface roughness of 0.2 to 1.0 μm.

Further, in the above invention, the upper layer of the antireflection constituent layer may be made of a thermosetting resin, an ultraviolet curable resin or an electron beam curable resin.

In the above invention, a low reflection layer may be formed on the antireflection constituent layer.

In the above invention, an antifouling layer may be formed on the low reflection layer.

Further, in the above invention, a design layer may be formed in a portion other than a portion to be a transparent window portion.

The anti-reflection member includes a transparent base material, two anti-reflection constituent layers laminated on a transparent window of the transparent base material and having an uneven interface between the two layers, A hard coat layer disposed on the anti-reflective constituent layer of the present invention, and an anti-reflective layer disposed on the hard coat layer, and the average surface roughness of the interface at a portion to be a transparent window on which the anti-reflective layer is formed Ra may be 2.0 to 150 nm, and a curved surface or a flat surface having a radius of curvature of 40 mm or more convex on the surface side at a portion to be a transparent window may be used.

The anti-reflection transfer material has at least two anti-reflection constituent layers each having an uneven shape on the base sheet on the substrate sheet. It may be configured such that the uneven shape is different from the surrounding area around the visual recognition area in the formed part.

In the anti-reflection transfer material, at least an anti-reflection layer is provided directly or via a release layer on the base sheet, and the average surface roughness Ra of the surface of the base sheet or the release layer surface is 2. 0 to 150 nm, and at least two antireflection constituent layers each having an uneven shape at the interface between the antireflection layer and the release layer on the opposite side of the base sheet from the transparent sheet. You may comprise so that it may be laminated.

[0022]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the antireflection member of the present invention. FIG. 2 is a cross-sectional view showing one embodiment of a transfer material used in the method for manufacturing an anti-reflection member of the present invention. FIG. 3 is a perspective view showing an embodiment of the anti-reflection member of the present invention. 4 and 5 are cross-sectional views showing one step of the method for manufacturing an antireflection member according to the present invention. FIG. 6 is a sectional view showing a conventional antireflection member. FIG. 7 is a perspective view showing one embodiment of the antireflection member of the present invention. 8 to 1
FIG. 2 is a sectional view showing an embodiment of the antireflection member of the present invention. FIG. 13 is a sectional view showing one embodiment of the antireflection transfer material of the present invention. In the figure, 1 is an anti-reflection member, 2 is an antifouling layer, 3 is a low reflection layer, 4 is an uneven layer, 5 is a design layer, 6 is an adhesive layer, 7 is a transparent substrate, 8 is a base sheet, and 9 is a transfer. Timber,
10 is a mold, 11 is a primer layer, 12 is incident light, 13
Denotes an intermediate layer, 14 denotes a hard coat layer, and 15 denotes a release layer.

The anti-reflection member 1 of the present invention comprises a transparent substrate 7
The two layers of the antireflection constituent layer whose mutual interface has an uneven shape are laminated on the portion to be the transparent window portion (see FIG. 1).

In order to provide two layers of antireflection constituent layers each having an uneven surface on the transparent substrate 7, it is preferable to use a transfer method using the transfer material 9 or a simultaneous molding transfer method.

The transfer method is to use a transfer material 9 having a transfer layer composed of various layers formed on a base sheet 8 and to apply heat and pressure to bring the transfer layer into close contact with an object to be transferred. This is a method in which decoration is performed by peeling and transferring only the transfer layer to the surface of the transfer object. The molding simultaneous transfer method means that a transfer material 9 is sandwiched in a mold 10 and a molten resin is injected into the mold 10.
At the same time as cooling to obtain a resin molded product, a transfer material 9 is adhered to the surface of the molded product, the base sheet 8 is peeled off, and a transfer layer is transferred to the surface of the resin molded product to perform decoration.

In the present invention, as the transfer material 9, a material in which at least two antireflection constituent layers each having a concavo-convex shape on the base sheet 8 are formed as a transfer layer is used (see FIG. 2). . As the transfer layer, not all the layers formed on the transparent substrate 7 of the antireflection member 1 are incorporated, but only the layer that is preferably formed by the simultaneous molding transfer method is used as the transfer layer, and the other layers are It is preferable to form them separately. In particular, the concavo-convex layer 4 and the pattern layer 5 are suitable for being formed by a molding simultaneous transfer method.

The base sheet 8 may be made of a polypropylene resin, a polyethylene resin, a polyamide resin,
What is used as a base sheet of a usual transfer material, such as a resin sheet of a polyester resin, an acrylic resin, a polyvinyl chloride resin, or the like, can be used.

When the transfer layer has good releasability from the base sheet 8, the transfer layer may be provided directly on the base sheet 8. In order to improve the releasability of the transfer layer from the base sheet 8, a release layer may be formed over the entire surface before providing the transfer layer on the base sheet 8.

The low reflection layer 3 may be formed on the entire surface of the base sheet 8 or the release layer, if necessary. By providing the low reflection layer 3, the reflection of the incident light 12 can be further prevented.

The material of the low reflection layer 3 is Al ₂ O ₃ ,
A vapor-deposited layer of a metal compound such as ZnO ₂ or MgF ₂ or Si
Low refractive index metal compounds such as O ₂ and MgF ₂ and Zn
An evaporation layer in which a metal compound having a high refractive index such as O ₂ or TiO ₂ is laminated, a resin coating layer made of a fluorine-based polymer, silicon oxide gel, or the like can be used.
Further, a combination of these may be used.

The method for producing the low reflection layer 3 includes a vacuum deposition method, a sputtering method, an ion plating method and the like. Alternatively, there is a method in which an organometallic compound such as a metal alcoholate or a metal chelate is applied by a dip coating method, a printing method, a coating method, or the like, and then a metal oxide film is formed by light irradiation or drying to obtain a low reflection layer 3. .

The low-reflection layer 3 may be a single low-refractive-index layer or a composite layer of a low-refractive-index layer and a high-refractive-index layer.
The use of a composite layer can further improve the antireflection property. In order to avoid an increase in the number of steps when a composite layer is used, it is very efficient if the low reflection layer 3 is formed by a continuous coating method using roll-to-roll. In the transfer material 9 as in the present case,
Continuous production by roll-to-roll is possible.

The film thickness of the low reflection layer 3 is represented by the general formula n × d = λ /
4 or a general formula n × d = 3λ / 4 (where n is the refractive index of the low-refractive-index substance, d is the film thickness of the low-refractive-index substance, and λ is the low-reflection center wavelength, respectively). Good to do. Usually, the thickness of the low reflection layer 3 is 0.01 to 2 μm.
Range.

Next, an uneven layer 4 is provided. By providing the concavo-convex layer 4, an upper layer of two antireflection constituent layers whose mutual interface has a concavo-convex shape is formed. Uneven layer 4
Examples of the material include acrylic resin, polyester resin, polyvinyl chloride resin, cellulose resin, rubber resin, polyurethane resin, polyvinyl acetate resin, etc., as well as vinyl chloride-vinyl acetate copolymer resin, It is preferable to use a copolymer such as an ethylene-vinyl acetate copolymer resin. When a thermosetting resin or an ionizing radiation-curable resin such as an ultraviolet ray or an electron beam is used, the hardness of the uneven layer 4 can be increased. As UV-curable resin,
There are UV-curable acrylic urethane-based resins, UV-curable polyester acrylate-based resins, UV-curable epoxy acrylate-based resins, and the like, which are used together with a photopolymerization initiator. For example, an ultraviolet-curable acrylic urethane-based resin is obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and reacting the obtained product with an acrylate or methacrylate-based monomer having a hydroxyl group. As the photopolymerization initiator, a benzophenone derivative, an acetophenone derivative, an anthraquinone derivative or the like can be used alone or in combination. A thermoplastic acrylic resin or the like may be appropriately selected and blended with the ultraviolet curable resin in order to further improve the film formation.

The method of forming the uneven layer 4 includes a coating method such as a gravure coating method, a roll coating method, and a comma coating method, and a printing method such as a gravure printing method and a screen printing method.

As a method of forming irregularities on the surface of the uneven layer 4, a method of mixing a light diffusing agent into the uneven layer 4 and directly applying the light diffusing agent to the substrate surface, a method of embossing the surface of the uneven layer 4, and the like are available. is there.

As the light diffusing agent, silica beads or acrylic beads having been subjected to an organic coating treatment may be used.
In order to disperse the light diffusing agent that has been subjected to the organic coating in the uneven layer 4, it is preferable that the content of the light diffusing agent is 15 parts by weight or less based on 100 parts by weight of the ink for the uneven layer 4.

On the surface of the uneven layer 4 made of an ultraviolet curable resin and having a thickness of 5 μm, irregularities having various average surface roughnesses are formed by using silica beads having a particle size of about 0.4 to 8 μm, and the total light transmittance and When the reflectance at 550 nm was measured to verify the antireflection effect, the average surface roughness was 0.2
It has been found that it is preferable to control the thickness within a range of about 1.0 μm (see Table 1).

Further, a comparison between the case where the anti-reflection member 1 is manufactured by the method for manufacturing the anti-reflection member 1 of the present invention and the case where the low reflection layer 3 is formed after forming a molded product is shown.
In the case of the present invention, it was found that not only the antireflection effect was improved but also the light transmittance tended to be slightly higher (see Table 2). The reason is that a part of the incident light 12 irregularly reflected by the uneven shape is reflected again at the interface between the uneven layer 4 and the low-reflection layer 3 because the uneven shape has a structure existing inside the antireflection member 1. This is considered to be because it is difficult to come out of the surface due to the above (see FIG. 1). The total light transmittance was measured based on the method specified in Japanese Industrial Standard (JIS) K6714.

Further, the symbol layer 5 may be formed as required. The design layer 5 is a layer for decorating the antireflection member 1. When the anti-reflection member 1 is a cover part of a display portion, the design layer 5 is usually provided partially in a frame-shaped or character-shaped pattern other than a portion serving as a transparent window. The design layer 5 is usually formed as a printing layer. As the material of the print layer, polyvinyl resin, polyamide resin, polyester resin, acrylic resin,
It is preferable to use a colored ink containing a resin such as a polyurethane resin, a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin, or an alkyd resin as a binder, and a pigment or dye of an appropriate color as a coloring agent. As a method for forming the printing layer, a normal printing method such as an offset printing method, a gravure printing method, or a screen printing method may be used.

The design layer 5 may be composed of a metal thin film layer or a combination of a printing layer and a metal thin film layer. The metal thin film layer is for expressing metallic luster as the design layer 5, and is formed by a vacuum evaporation method, a sputtering method, an ion plating method, a plating method, or the like. Depending on the metallic gloss color you want to express, aluminum,
Metals such as nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, and zinc, and alloys or compounds thereof are used. The metal thin film layer is usually formed partially. Further, when providing the metal thin film layer, a front anchor layer or a rear anchor layer may be provided in order to improve the adhesion to other layers.

Further, an adhesive layer 6 is formed on the transparent substrate 7 in order to adhere the above layers. When the uneven layer 4 and the adhesive layer 6 are in contact with each other, the mutual interface has an uneven shape.
The antireflection constituent layer of the layer will be formed. As the adhesive layer 6, a heat-sensitive or pressure-sensitive resin suitable for the material of the transparent substrate 7 is appropriately used.

For example, when the material of the transparent substrate 7 is an acrylic resin, it is preferable to use an acrylic resin. When the material of the transparent substrate 7 is a polyphenylene oxide / polystyrene resin, a polycarbonate resin, or a polystyrene blend resin, an acrylic resin, a polystyrene resin, a polyamide resin, or the like having an affinity for these resins is used. do it. Further, when the material of the transparent substrate 7 is a polypropylene resin, a chlorinated polyolefin resin,
Chlorinated ethylene-vinyl acetate copolymer resin, cyclized rubber,
Coumarone indene resin can be used. As a method for forming the adhesive layer 6, a gravure coating method, a roll coating method,
There are a coating method such as a comma coating method and a printing method such as a gravure printing method and a screen printing method.

The structure of the transfer layer is not limited to the above embodiment. For example, when a transparent layer having excellent adhesion to the transparent substrate 7 is used as the material of the design layer 5, the adhesive layer 6 is omitted because the layer corresponds to the lower layer of the antireflection constituent layer. Can be.

In addition to the case where the antireflection constituent layer having the uneven interface is a combination of the uneven layer 4 and the adhesive layer 6 or the uneven layer 4 and the design layer 5 (see FIG. 1), other layers may be used. You may comprise so that it may be implement | achieved by combination with a layer. For example, as shown in FIG.
And the intermediate layer 13. Middle layer 1
3 may be formed using the same material as the uneven layer 4.
Further, as shown in FIG. 10, the anti-reflection may be realized by an interface between two uneven shapes including three layers of the uneven layer 4, the intermediate layer 13, and the adhesive layer 6.

When the uneven interface is formed by two layers other than the adhesive layer 6, the adhesive layer 6 can be formed with a uniform thickness regardless of the size of the unevenness of the uneven shape. And the adhesiveness with the resin can be stabilized. Also,
In the case where an uneven interface is formed by two layers of the adhesive layer 6 and other layers, one layer constituting the antireflection member can be omitted.

Note that depending on the use of the antireflection member 1,
In some cases, the surface can be divided into a region where an excellent antireflection function is particularly required and a region where no particular problem occurs even if the antireflection function is slightly lowered. FIG. 7 shows, as an example, a vertical two-dimensional liquid crystal display used in a full-color liquid crystal display of a mobile phone.
FIG. 3 is a perspective view showing an antireflection member 1 having a size of 5 mm and a width of 33 mm. In the anti-reflection member 1 for such an application, the central area A is an area where the user of the mobile phone pays the most attention, in other words, the viewing area of the transparent window, so that the anti-reflection function is particularly necessary. Area.
On the other hand, since the peripheral area B around the center area A is not the area that the user of the mobile phone gazes at, a very high antireflection function is not required. Further, as the radius of curvature R of the surface shape of the antireflection member 1 decreases, the necessity of the antireflection function decreases. For example, when the surface shape of the antireflection member 1 shown in FIG. 7 has the cross-sectional shape shown in FIG.
In a very small surrounding area B where the radius of curvature R is less than 40 mm, there is little possibility that the user of the mobile phone gazes.

Accordingly, as shown in FIG. 11, the central area A and the peripheral area B may be configured to have different irregularities. In order to make the uneven shape different, it is preferable to use means such as changing the degree of embossing unevenness.

Using the anti-reflection transfer material 9 having the above-described structure, the anti-reflection member 1 can be easily obtained by a transfer method.

First, the adhesive layer 6 side of the antireflection transfer material 9 is brought into close contact with the surface of the transparent substrate 7. Next, using a transfer machine such as a roll transfer machine or an up-down transfer machine equipped with a heat-resistant rubber-like elastic body such as silicon rubber, a heat-resistant rubber-like material set at a temperature of about 80 to 260 ° C. and a pressure of about 490 to 1960 Pa was used. Heat and pressure are applied from the side of the base sheet 8 of the anti-reflection transfer material 9 via the elastic body. By doing so, the adhesive layer 6 adheres to the surface of the transparent substrate 7.

Finally, when the base sheet 8 is peeled off after cooling, peeling occurs at the interface between the base sheet 8 and the low reflection layer 3, and the transfer is completed. In the case where a release layer is provided on the base sheet 8, when the base sheet 8 is peeled off, peeling occurs at a boundary surface between the release layer and the low reflection layer 3, and transfer is completed. Thus, the antireflection member 1 can be obtained.

Next, using the anti-reflection transfer material 9 described above,
A method for obtaining the anti-reflection member 1 using the simultaneous molding transfer method by injection molding will be described.

As the molding die 10, one used for injection molding is used.

First, the transfer material 9 is fed into the molding die 10 (see FIG. 4). At this time, the sheet-like transfer material 9 may be fed one by one, or a necessary portion of the long transfer material 9 may be sent intermittently. When a long transfer material 9 is used, it is preferable to use a feeding device having a positioning mechanism so that the register of the design layer 5 of the transfer material 9 and the molding die 10 coincide. When the transfer material 9 is intermittently fed, the position of the transfer material 9 is detected by a sensor, and then the transfer material 9 is detected.
Is fixed by the movable mold and the fixed mold, the transfer material 9 can be fixed at the same position at all times, and the pattern layer 5 is not misaligned, which is convenient.

After the molding die 10 is closed, the molten resin is injected and filled into the die 10 from the gate, and the transfer material 9 is adhered to the surface of the transferred material simultaneously with the formation of the transferred material (see FIG. 5). .

The resin that can be used for the transparent substrate 7 includes polystyrene resin, polyolefin resin, A
General-purpose resins such as BS resin, AS resin, and AN resin can be used. In addition, general-purpose engineering resins such as polyphenylene oxide / polystyrene resin, polycarbonate resin, polyacetal resin, acrylic resin, polycarbonate-modified polyphenylene ether resin, polybutylene terephthalate resin, ultra-high molecular weight polyethylene resin, polysulfone resin, polyphenylene sulfide resin A super engineering resin such as a resin, a polyphenylene oxide resin, a polyarylate resin, a polyetherimide resin, a polyimide resin, a liquid crystal polyester resin, and a polyallyl heat-resistant resin can also be used. Further, a light diffusing agent made of silica beads, acrylic beads, or the like may be mixed in these molding resins.

The shape of the transparent substrate 7 may be a flat plate or a two-dimensional or three-dimensional curved surface.

After cooling the resin molded article as the transfer object,
The molding die 10 is opened and the resin molded product is taken out. Finally, the base sheet 8 of the transfer material 9 is peeled off. In this way, only the transfer layer can be transferred to the molded article.

In this way, the transfer layer and the molding resin are integrated, and two layers of antireflection constituent layers whose mutual interface has an uneven shape are formed on the transparent window portion of the transparent substrate 7. The laminated antireflection member 1 can be formed (see FIGS. 1 and 3).

In the anti-reflection member 1 obtained by using the transfer material 9 as described above, if the low reflection layer 3 is not formed, the low reflection layer 3 may be provided as needed. The low reflection layer 3 can be formed in the same manner as when forming the transfer material 9 as a transfer layer.

Further, an antifouling layer 2 may be provided as needed. The antifouling layer 2 is a layer provided on the low-reflection layer 3 to prevent contamination of the antireflection member 1, and is a layer made of a material having water repellency and oil repellency. As the antifouling layer 2, a surfactant having fluorine in a terminal group or the like may be used.
The antifouling layer 2 may be provided by a coating method, a dipping method, a vacuum deposition method, or the like. The thickness of the antifouling layer 2 is preferably as thin as possible. This is because, when the thickness of the antifouling layer 2 is large, the light transmittance of the antireflection member 1 decreases.

As described above, the anti-reflection member 1 is
Is configured such that two layers of antireflection constituent layers each having a concavo-convex shape are laminated on a portion to be a transparent window part, so that a part of the incident light 12 irregularly reflected on the concavo-convex interface is reduced. Since the light is reflected again at another interface, the light transmittance can be increased as compared with the case where irregularities are formed on the surface of the anti-reflection member and irregular reflection is performed to obtain anti-glare properties, and an excellent anti-reflection effect is obtained. Can be.

Further, in the present invention, the anti-reflection member may be configured as follows. For example, as shown in FIG. 12, in the central region A, a high antireflection layer 3H composed of a plurality of layers, a hard coat layer 14, and an intermediate layer 13 are provided.
And the adhesive layer 6 and the transparent substrate 7, the surface of the hard coat layer 14 has an average surface roughness Ra of 5 to 35 nm, and the interface between the intermediate layer 13 and the adhesive layer 6 has a large uneven surface. It has become. In the surrounding area B, the low anti-reflection layer 3
L, the hard coat layer 14, the intermediate layer 13, and the adhesive layer 6
And the transparent substrate 7, the surface of the hard coat layer 14 has an average surface roughness Ra of 35 to 150 nm, and the interface between the intermediate layer 13 and the adhesive layer 6 is an uneven interface with small unevenness. Therefore, with such a configuration, it is possible to obtain an excellent surface strength and an excellent antireflection effect.

Further, in order to obtain an anti-reflection member having the above configuration, an anti-reflection transfer material can be configured, for example, as shown in FIG. That is, in the central region A, the base sheet 8, the release layer 15H having a small average surface roughness Ra, the high antireflection layer 3H composed of a plurality of layers,
It is composed of the hard coat layer 14 and the adhesive layer 6, and the interface between the hard coat layer 14 and the adhesive layer 6 is an uneven interface having large unevenness. In the peripheral region B, the base sheet 8, the release layer 15 </ b> L having an average surface roughness Ra of about 110 to 140 nm and a minimum antireflection effect can be obtained, the low antireflection layer 3 </ b> L, and the hard coat layer 14. And the adhesive layer 6, and the interface between the hard coat layer 14 and the adhesive layer 6 is an uneven interface with small unevenness. Therefore, by using the antireflection transfer material having such a configuration, an antireflection member having excellent surface strength and excellent antireflection effect can be easily obtained. In the antireflection member having such a configuration, light that has reached the uneven surface is scattered near the sea surface and becomes brighter due to the diffusion effect. On the other hand, light near the outermost antireflection layer is canceled out by interference. Therefore, although the screen is bright, no glare is caused by the brightness, and the display screen is very easy for the viewer to see and easy on the eyes.

[0066]

EXAMPLES (Examples 1 to 7) A polyethylene terephthalate resin film having a thickness of 25 μm was used as a base sheet.
A melamine resin was coated thereon to form a release layer.
A low reflection layer made of silicon oxide having a thickness of about 0.1 μm was formed thereon. On top of this, 100 parts by weight of an ultraviolet curable resin (Aronix M8030 manufactured by Toa Gosei Co., Ltd.)
An ink for an uneven layer was prepared by adding 8 parts by weight of silica beads having a particle size of about 0.4 to 8.0 μm to form an uneven layer having an average thickness of 5 μm with various average surface roughness. An adhesive layer was formed thereon using an acrylic adhesive ink to obtain a transfer material.

An acrylic film having a thickness of 125 μm was used as a transparent base material, laminated on a transfer material, bonded by applying heat and pressure from the base sheet side with a roll transfer machine, and peeled off the base sheet together with a release layer. An anti-reflection member having a low reflection layer, a concavo-convex layer, and an adhesive layer formed sequentially from the front side was obtained.

[0068]

[Table 1]

In the evaluation results, ○ indicates good, Δ indicates acceptable, and × indicates unacceptable. As a result, the average surface roughness of the uneven layer was 0.1.
It has been found that the thickness is preferably in the range of 2 to 1.0 μm. When the average surface roughness exceeded 1.0 μm, the light transmittance was considerably lowered and the screen was difficult to see.

Example 2 A 25 μm-thick polyethylene terephthalate-based resin film was used as a base sheet, and a release layer composed of a melamine resin was formed thereon. Opstar JN721 manufactured by JSR Corporation was used as a low refractive index layer ink.
5 and a low refractive index layer having a thickness of 0.09 μm and an ink for a high refractive index layer, Opstar JN710 manufactured by JSR Corporation.
2, a low-reflection layer composed of a high-refractive-index layer having a thickness of 0.12 μm, and a particle size of 0.5 μm with respect to 100 parts by weight of an ultraviolet-curable resin (Aronix M8030 manufactured by Toa Gosei Co., Ltd.)
An uneven layer using an ink for an uneven layer to which 8 parts by weight of silica beads were added, and an adhesive layer using an acrylic resin adhesive ink were sequentially formed by a gravure multicolor printer to obtain a transfer material.

The transfer material is placed on an injection mold (female mold) that conforms to the surface shape of the molded article for the mobile phone display unit, the mold is closed, and an acrylic molding resin manufactured by Mitsubishi Rayon Co., Ltd. is injected. Then, an anti-reflection member as a molded product for a mobile phone display unit was obtained.

As Comparative Example 2, a molded article was prepared first, and the above four kinds of inks were applied to the molded article, using an adhesive ink, an ink for an uneven layer, an ink for a high refractive index layer, and an ink for a low refractive index layer. An antireflection member was obtained by forming the ink in the order of dipping coating.

When the antireflection members thus obtained were compared with each other, it was found that in Comparative Example 2, the difference in the film thickness in the vertical direction of the coating tended to be large, and that the in-plane variation of the antireflection performance was large. . Also, when comparing the reflectance and light transmittance at 550 nm, Example 8 was superior. In addition, Example 8 was also superior in productivity.

[0074]

[Table 2]

[0075]

Since the present invention employs the above-described configuration, the following effects can be obtained.

The anti-reflection member of the present invention has excellent reflection because two layers of anti-reflection constituent layers each having an uneven surface are laminated on a portion to be a transparent window of a transparent substrate. It has a preventive effect.

Further, the method of manufacturing an antireflection member according to the present invention comprises the steps of: transferring a transfer material having at least two antireflection constituent layers each having an uneven surface on a base sheet to a cavity surface; It is set in a mold so as to be in contact with it, and a transparent molten resin is injected into the mold to obtain an integrated product of a transparent base material made of resin and a transfer material, and then the base sheet is peeled off, so that an excellent antireflection effect is obtained. Can easily be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of an antireflection member of the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of a transfer material used in the method for manufacturing an anti-reflection member of the present invention.

FIG. 3 is a perspective view showing an embodiment of the antireflection member of the present invention.

FIG. 4 is a cross-sectional view showing one step of the method for manufacturing an antireflection member of the present invention.

FIG. 5 is a sectional view showing one step of a method for manufacturing an antireflection member of the present invention.

FIG. 6 is a sectional view showing a conventional anti-reflection member.

FIG. 7 is a perspective view showing one embodiment of the antireflection member of the present invention.

FIG. 8 is a sectional view showing an embodiment of the anti-reflection member of the present invention.

FIG. 9 is a sectional view showing an embodiment of the antireflection member of the present invention.

FIG. 10 is a sectional view showing an embodiment of the antireflection member of the present invention.

FIG. 11 is a sectional view showing an embodiment of the antireflection member of the present invention.

FIG. 12 is a sectional view showing an embodiment of the antireflection member of the present invention.

FIG. 13 is a sectional view showing an embodiment of the antireflection transfer material of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antireflection member 2 antifouling layer 3 low reflection layer 4 uneven layer 5 pattern layer 6 adhesive layer 7 transparent substrate 8 base sheet 9 transfer material 10 mold 11 primer layer 12 incident light 13 intermediate layer 14 hard coat layer 15 release layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02F 1/1335 G02B 1/10 A 5G435 G09F 9/00 313 Z F Term (Reference) 2H042 BA04 BA12 BA13 BA15 BA20 2H089 HA17 HA40 QA16 2H091 FA37X FB02 FC18 FD06 LA17 2K009 AA02 AA12 AA15 BB24 CC03 CC06 CC09 CC26 CC42 CC45 DD02 DD03 DD04 DD07 DD15 EE05 4F100 AA20 AK01B AK25 AK36 AK42 AR00 BA10 BA10 BA00 AR10BA00 BA00 AR00A AR00B AR10B DD07C DD07E GB41 GB90 HB00A JB13B JB14B JL06D JL14E JN01A JN06 JN06B JN06C JN06E YY00A YY00B YY00C YY00E 5G435 AA01 BB05 BB12 FF03 HH05 KK05 KK07 LL07 LL14 LL17LL14LL

Claims (15)

[Claims] Claims: 1. On a portion of a transparent base material to be a transparent window portion,
An anti-reflection member comprising two layers of anti-reflection constituent layers each of which has an uneven interface with each other. 2. The uneven shape has an average surface roughness Ra of 0.2 to 0.2.
2. The anti-reflection member according to claim 1, wherein the thickness is 1.0 μm. 3. An anti-reflection component layer comprising a thermosetting resin,
The anti-reflection member according to any one of claims 1 to 2, wherein the anti-reflection member is made of an ultraviolet curable resin or an electron beam curable resin. 4. The antireflection member according to claim 1, wherein a low reflection layer is laminated on an upper layer of the antireflection constituent layer. 5. The antireflection member according to claim 4, wherein an antifouling layer is laminated on the low reflection layer. 6. The anti-reflection member according to claim 1, wherein a design layer is formed in a portion other than a portion to be a transparent window portion. 7. A transfer material on which at least two antireflection constituent layers each having an uneven shape on the base sheet are formed on a base sheet is set in a mold so that the base sheet is in contact with the cavity surface, and the mold is formed. A method of manufacturing an anti-reflection member, comprising: injecting a transparent molten resin into the inside to obtain an integrated product of a transparent base material and a transfer material made of a resin, and then peeling the base sheet from the integrated product. 8. The uneven shape has an average surface roughness Ra of 0.2 to 0.2.
The method for manufacturing an anti-reflection member according to claim 7, wherein the thickness is 1.0 μm. 9. An anti-reflection component layer comprising a thermosetting resin,
The method for producing an anti-reflection member according to any one of claims 7 to 8, wherein the method comprises an ultraviolet curable resin or an electron beam curable resin. 10. The method for manufacturing an antireflection member according to claim 7, wherein a low reflection layer is formed on the upper layer of the antireflection constituent layer. 11. The method according to claim 10, wherein an antifouling layer is formed on the low reflection layer. 12. The method for manufacturing an anti-reflection member according to claim 7, wherein a design layer is formed in a portion other than a portion to be a transparent window portion. 13. A transparent base material, two antireflection constituent layers laminated and arranged on a portion to be a transparent window of the transparent base material, wherein two interfaces have an uneven shape, and two antireflection constituent layers. A hard coat layer disposed thereon and an antireflection layer disposed on the hard coat layer, and an average surface roughness Ra of an interface at a portion to be a transparent window having the antireflection layer formed thereon is 2.0 ~
An antireflection member having a thickness of 150 nm, a curved surface or a flat surface convex to the surface side having a radius of curvature of 40 mm or more at a portion to be a transparent window. 14. At least two antireflection constituent layers each having an uneven surface at each other are formed on a base sheet,
An anti-reflection transfer material, characterized in that the visible area of the transparent window and the surrounding area of the visible area of the transparent window have different irregularities. 15. An anti-reflection layer is provided on a base sheet at least directly or via a release layer, and the average surface roughness Ra of the surface of the base sheet or the release layer is 2.0 to 1
At least 50 nm, and at least two antireflection component layers each having an uneven shape at the interface between the antireflection layer and the release layer on the opposite side of the base sheet from the base sheet, are laminated. An anti-reflection transfer material, characterized in that: