JP3374299B2 - Anti-glare film - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scratch-resistant antiglare film used for various displays such as word processors, computers, televisions, in-vehicle instrument panels, etc., particularly liquid crystal displays, and a method for producing the same.

[0002]

2. Description of the Related Art As a method for improving usability on a display surface, various attempts have been made to satisfy contradictory performance requirements of reducing glare and not reducing image resolution. . For example, Japanese Patent Laid-Open No. 5-1
As described in 62261, the method of using beads having one or several kinds of particle diameters to provide an antiglare property generally has a poor balance of haze and glossiness (optical characteristics). That is, when an anti-glare film having a high Haze is produced, it is usual to increase the amount of the matting agent (various beads, etc.) mixed in the resin to be coated. If the amount is increased, the suitability for coating is deteriorated and it is difficult to obtain a uniform coated surface. Further, in the non-glare method specified in JP-A-63-298201 and JP-A-64-46702, unevenness is formed using a mold material, but this method is dense (Ra = 0.5 or less) and high. An antiglare film having a haze (15 to 45) cannot be manufactured. Also in terms of surface texture, the matting agent mixed type is more uniform.

[0003]

DISCLOSURE OF THE INVENTION It is an object of the present invention to provide a good resolution of displayed characters and other images and a clear contrast without actually feeling glare when actually viewing an image on a display. Like a state,
It is to obtain an antiglare film having excellent optical properties.

[0004]

As a result of earnest research, the present inventors have found that a scratch-resistant hard coat and a thin coat layer on the surface of which a desired optical characteristic value can be accurately reproduced. The following inventions, which are mainly characterized by the above, have been obtained. They include the inventions described below. On a transparent plastic film has a rough uneven layer comprised of an ionizing radiation curable resin, fine irregularities there Ri along the surface of the uneven layer, the center
The average line roughness (Ra) is 0.1 to 1.0 μm, and the average
The interval (Sm) is 20 to 120 μm, and the rough
Center line average roughness (Ra) of irregularities is 0.5 to 1.5 μm
And the average spacing (Sm) is 100 to 300 μm,
The center line average roughness (Ra) of the fine irregularities is 0.05 to
An antiglare film having a thickness of 0.5 μm and an average spacing (Sm) of 20 to 70 μm . Haze is 22 ~
30 is an antiglare film. The rough unevenness is used as the first coat layer, and the fine unevenness is used as the second coat layer .
An antiglare film characterized by being used as a coat layer . Previous
The serial coarse irregularities, embossing method, a sand blasting method, when dry
Of forming by any of the resin convection method, the yet small irregularities, formed by a thin-film coating layer or lifting effect
An anti-glare film characterized by that .

Further, the present invention will be described in detail.
The constitution of the scratch-resistant antiglare film according to the present invention includes:
Ionizing radiation curable resin is applied to the transparent film as the base material, the solvent is dried, and then the patterning film is laminated on the ionizing radiation curable resin layer, irradiated with ionizing radiation, and cured by ionizing radiation. It is obtained by curing the mold resin, peeling off the patterning film, and then forming a resin layer having an antiglare property.

Various films can be used as the transparent plastic film as the base material. Examples thereof include triacetyl cellulose film, polyester film, polyethylene film, polypropylene film, polyvinyl chloride film, acetyl cellulose butyrate film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film and the like. The material as the patterning film that can be used in the present invention has flexibility of 10 to 100 μm.
m is a polyester film, a triacetyl cellulose film, a polyethylene film, a polypropylene film, a polycarbonate film, a nylon film, etc., and at least one side of these films is
The surface is roughened, but the method of surface roughening is
The surface of the flat film may be roughened by spraying an ultra-hard powder or granules onto the flat film by an embossed metal roll and a pressure roll, or by transferring it to a flat film.

As the ionizing radiation curable resin, UV / E
Resins that are cured by B, for example, as disclosed in Japanese Patent Laid-Open No. 5-162261, as the ultraviolet curable resin, an ultraviolet curable acrylic urethane resin, an ultraviolet curable polyester acrylate resin, an ultraviolet curable epoxy acrylate resin, or the like is used. Can be used. For example, the UV-curable acrylic urethane-based resin is obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and then 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. In this ionizing radiation curable resin, a component that improves film formation, such as an acrylic resin, may be appropriately selected and blended. In addition, a viscosity adjusting agent, a solvent and the like are mixed to obtain a coating liquid. As the matting agent, inorganic beads such as silica beads and resin beads such as acrylic beads can be mainly used.

The present invention will be described in more detail with reference to FIG. On the transparent film 1, the coating liquid 2 containing an ionizing radiation-curable resin as a main component is applied, the solvent is dried and removed, and then the coating liquid 2 is flexible and has at least one rough surface. The concavo-convex surface of the mold film 3 is laminated on the coated surface, and then ultraviolet rays are radiated through the transparent film 1 or the shape-imparting film 3 to cure the ionizing radiation-curable resin 2 and then the shape-imparting film is peeled off. To do. The center line average roughness (Ra) of this rough uneven surface is
In the range of 0.5 to 1.5 μm, and the average spacing of irregularities (S
m) is preferably in the range of 100 to 300 μm.
Thus the uneven rough surface of the resultant coated surface, by providing the thin antiglare coating layer 6, proof with superior optical properties
A glare film could be obtained. The antiglare coating layer is, for example, a composition which is substantially the same as the ionizing radiation curable resin, but as a coating liquid containing organic surface-treated silica beads or the like, it is diluted with a solvent and sprayed. A second coat layer is formed in a thin film on the surface of the ionizing radiation-curable resin that has been subjected to the shaping treatment by a coat or the like. FIG. 1 schematically shows the cross section. That is, a film having excellent antiglare properties and light transmittance was obtained due to the fine unevenness formed along the rough uneven surface formed by the shape-imparting film. The center line average roughness (Ra) of the fine uneven surface of the second coat layer is 0.05 to 0.
The range of 5 μm and the average interval (Sm) of the unevenness are 20
A range of ˜70 μm is preferred. R as an anti-glare film according to the present invention provided with the first and second coat layers
As the range of a and Sm, Ra is 0.1 to 1.0.
20 μm and Sm of 20 to 120 μm show good antiglare properties. The second thin film-like, so-called second coat layer provided on the first rough coat layer is basically composed of a method of containing a light diffusing agent. As long as it indicates

In the above description, the first coat layer is provided on the transparent film, but it may be provided on the uneven surface of the shape-imparting film having flexibility, in which case the uneven surface of the shape-imparting film is used. Is coated with the above-mentioned first coating liquid containing an ionizing radiation-curable resin as a main component, and after removing the solvent, a transparent film is laminated, and ultraviolet rays are radiated through the shape-imparting film or the transparent film. The curable resin is cured, and then the patterning film is peeled off. The step of providing the second coat layer 6 on the patterned coat surface 2 can be performed in the same manner as described above. In the above-mentioned method, the first unevenness was formed by the shape-imparting film, but rough unevenness was formed by resin convection during the drying of the ionizing radiation-curable resin, and the thin film-shaped second unevenness was formed by the same method as described above.
You may provide the coating layer of.

Another method for obtaining the same effect is to emboss the transparent plastic film,
Alternatively, the surface may be roughened by sandblasting to form the first unevenness, and then the second thin film may be provided in the same manner as in the above method. The antiglare obtained by the embossing method and the sandblasting method may be used. 2 and 3 schematically show the cross section of the sexual imparting film. As another method, as shown in FIG. 4, an ultraviolet curable resin containing solvent-diluted organically treated silica beads is applied onto a transparent plastic film to form rough irregularities due to resin convection during heat drying. Furthermore, it is possible to make fine irregularities by silica beads due to the lifting effect.

[0011]

The thus-obtained antiglare film exhibits desirable optical properties and is extremely useful in practical use in terms of scratch resistance and chemical resistance.

Example 1 Triacetyl Cellulose Film TAC1
[80 μm (Fuji TAC FT- made by Fuji Photo Film Co., Ltd.
UV-80)] and a UV curable resin 2 [(SEIKA BEAM manufactured by Dainichiseika Co., Ltd.]], polyfunctional monomer 100 parts by weight polymer 5 parts by weight initiator 3 parts by weight solvent (toluene) 7 g / m ² -After being coated so as to be dry, the solvent is dried, and then a matte PET3 [(X-42 manufactured by Toray Industries, Inc.)] is laminated as a patterning film having rough unevenness, and a distance of 15 cm is obtained using a 160 W mercury lamp. (Web speed: 12 m / min). After curing the resin, the matte PET was peeled off to obtain a non-glare TAC. To this non-glare TAC, 100 parts of an ultraviolet curable resin (Seika Beam S manufactured by Dainichiseika Co., Ltd.) and 15 parts of surface-treated silica beads (particle diameter 1.5 μm) was added to obtain a coating of 2 μ / dry 6 Then, after drying the solvent, UV irradiation with 3 mercury lamps from a distance of 15 cm
(160 W) was cured at a web speed of 10 m / min to obtain an antiglare film . The physical properties of the antiglare film were as follows. Haze 30%, 60
° Gross 20%, Ra = 0.37 μm, Sm = 2
4.3 μm, total light transmittance 90.0%

The measuring methods and measuring instruments for optical physical properties and surface roughness are as follows, and the same applies to the following examples. Haze <Haze>: JIS K7105 / Toyo Seiki direct reading haze meter Total light transmittance: JIS K7105 / Toyo Seiki direct reading haze meter Gloss <Gross>: JIS7105 / Murakami Color Research Laboratory GM- 3D

(Embodiment 2) Embossing roll 10 in which 180-mesh hard sand is sprayed on a semi-hard steel steel metal roll.
With a surface temperature of 120 ° C and a roll press pressure of 100 Kg / cm ² and a TAC film of 80 μm (Fuji Tec
Emboss AC FT-UV-80). On this film 4, 100 parts of ultraviolet curable resin (Seika Beam S manufactured by Dainichiseika Co., Ltd.) surface-treated with silica beads (particle size: 1.5
μm) Coating with 15 parts added so that it becomes 4 μ / dry 6
Then, after the solvent was dried, UV irradiation (160 W) was performed from a distance of 15 cm by three mercury lamps at a web speed of 10 m / min. To obtain an antireflection film. The physical properties of the obtained antireflection film were as follows. Haze 22%, 60 ° Gross 23%, Ra = 0.35μm, Sm = 3
0.3 μm, total light transmittance 90.0%

(Example 3) TAC film 1 [(Fuji TAC FT-UV-80 80 μm manufactured by Fuji Photo Film Co., Ltd.]] and an ultraviolet curable resin (Seika Beam S-1 manufactured by Dainichi Seika) 80 parts by weight of a polyfunctional monomer Trifunctional monomer 20 parts by weight Polymer 2 parts by weight Initiator 3 parts by weight of solvent-diluted organically treated silica beads (particle size 1.5 μm
m) was added to 5 g / m ² · dry, the solvent was dried at 80 ° C, and rough concavities and convexities were formed by resin convection, and then fine concavo-convex by silica beads due to the floating effect. In addition, the UV irradiation is 10 m / m from a distance of 15 cm using three 160 W mercury lamps.
An antiglare film was obtained by curing at an in-web speed.
The physical properties of the obtained film were as follows. Haz
e 28%, 60 ° Gross 22%, Ra = 0.3
4 μm, Sm = 27.2 μm, total light transmittance 90.0%

[0016]

The antiglare film obtained by the present invention is
Since the coating layer contains silica beads whose surface is organically treated with an organic substance and is sufficiently cured by UV irradiation, it has excellent surface hardness and chemical resistance, and is provided thinly on a roughened surface. With the coat layer, the optical properties such as antiglare property and transparency are more excellent than before.

[Brief description of drawings]

FIG. 1 is a schematic view of a cross section showing an embodiment of the present invention.

FIG. 2 is a schematic view of a cross section showing another embodiment of the present invention.

FIG. 3 is a conceptual cross-sectional view showing the middle of a step in carrying out the present invention.

FIG. 4 is a conceptual cross-sectional view showing the middle of the process in the implementation of the present invention.

[Explanation of symbols]

1. Transparent film 2. Coating layer of ionizing radiation curable resin 3. Shaped film 4. Embossed base transparent film 5. 5. Transparent patterning film roughened by sandblasting Ionizing radiation curable resin layer containing organically treated silica beads 7. Light diffusing agent 10. Embossing roll 11. Rubber roll 12. Heating part

Claims (4)

(57) [Claims] 1. A transparent plastic film having a rough uneven layer made of an ionizing radiation curable resin, fine unevenness along the surface of the uneven layer, and a center line average roughness (R).
a) is 0.1 to 1.0 μm, the average spacing (Sm) is 20 to 120 μm, and the center line of the rough unevenness.
The average roughness (Ra) is 0.5 to 1.5 μm, and the average interval is
(Sm) is 100 to 300 μm, and the fine irregularities are
Has a center line average roughness (Ra) of 0.05 to 0.5 μm,
An antiglare film having an average spacing (Sm) of 20 to 70 μm . 2. The antiglare film according to claim 1, wherein the haze is 22 to 30 . 3. The antiglare film according to claim 1, wherein the rough unevenness serves as a first coat layer and the fine unevenness serves as a second coat layer. 4. The rough irregularities are formed by any one of an embossing method, a sandblast method, and a resin convection method during drying, and the fine irregularities are formed by a thin film coat layer or a lifting effect. Item 4. The antiglare film according to any one of items 1 to 3.