JP3513009B2 - Transfer material for display front panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifouling property and antireflection property required for a front panel of a display such as a television.
The present invention relates to a transfer material for a display front plate which imparts a hard coat property, an electromagnetic shielding property, a near-infrared shielding property and the like.

[0002]

2. Description of the Related Art In recent years, CRTs, LCDs, PDPs,
The display field, such as EL, is undergoing rapid development. Along with this, physical properties such as antifouling property, antireflection property, hard coat property, electromagnetic wave shielding property, near infrared ray shielding property, etc. are required for the front panel of the display. On the other hand, conventionally, the functions have been provided by directly applying these functions to the front panel or applying those coated on a plastic film.

[0003]

However, a direct coating is applied to the front plate of a plastic plate such as a glass plate or an acrylic plate.
In the method of performing the coating, the coating is performed on one sheet and one sheet at a time, so that the productivity and the yield are deteriorated, and the processing cost is increased. Furthermore, it was very difficult to obtain good appearance. In addition, the method of applying a coating on a plastic film to the front plate causes problems such as peeling of the plastic film due to long-term use and storage.

Accordingly, an object of the present invention is to solve the problems of physical properties, processing cost, productivity, appearance and the like in the conventional display front plate making method by using the transfer material of the present invention. It is another object of the present invention to provide a transfer material for a front panel of a display which is excellent in antifouling property, antireflection property, electromagnetic wave shielding property, near infrared ray blocking property, processing cost, productivity and appearance.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is to provide at least a fluorine-based low-refractive-index hard coat layer on a base film surface having releasability. And a metal oxide-containing high refractive index conductive hard coat layer, a primer layer, and an adhesive layer containing a near infrared absorber.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The base film having releasability used in the transfer material for a display front plate of the present invention is not particularly limited, and a normal transfer foil having releasability and sufficient self-holding property is used. Any of these can be used. For example, synthetic resin films such as polyethylene terephthalate film, polypropylene film, polycarbonate film, polystyrene film, polyamide film, polyamide imide film, polyethylene film, polyvinyl chloride film and the like, and synthetic resin films such as cellulose acetate film, cellophane paper, glassine paper, etc. Film-like materials such as Western paper and Japanese paper, composite film-like materials or composite sheet-like materials thereof, and those obtained by subjecting them to release treatment are exemplified.

[0007] The thickness of the base film is not particularly limited, and is usually in the range of 4 to 150 µm, preferably 12 to 150 µm.
In the range of 100 μm, more preferably 30 to 10
It is preferable to use the one having a thickness of 0 μm from the viewpoint that a transfer material for a display front plate without wrinkles or cracks can be easily manufactured. When the releasability of these base films is insufficient, a release layer may be formed, and a material for forming the release layer is appropriately selected from known polymers and waxes that form the release layer. It can be used, for example, a resin such as paraffin wax, acrylic, urethane, silicone, melamine, urea, urea-melamine, cellulose, benzoguanamine, and a surfactant alone or a mixture thereof as a main component. A coating solution dissolved in an organic solvent or water prepared as described above is applied to the base film by a normal printing method such as a gravure printing method, a screen printing method, an offset printing method, and dried (thermosetting resin, ultraviolet curing) Curable coatings such as curable resins, electron beam curable resins, and radiation curable resins)
What was formed by making it do. The thickness of the release layer is not particularly limited, and is appropriately selected from the range of about 0.1 to 3 μm. When the thickness is less than 0.1 μm, it is difficult to release the mold. On the other hand, when the thickness exceeds 3 μm, the release becomes too easy, so that the foil may be detached before the transfer or the cost is not preferable.

The fluorine-based low refractive index hard coat layer of the present invention has a low refractive index of 1.5 or less, preferably 1.4 or less (1.2 or more). Fluorine atom-containing film with excellent transparency and pencil hardness of H
As described above, the adhesiveness to the high refractive index conductive hard coat layer containing a metal oxide is excellent. Specific examples of these raw material compounds for forming a fluorine-based low refractive index hard coat layer include a terminal silicon compound containing a perfluoroalkylene group, an epoxy compound containing a perfluoroalkylene group, and a melamine compound containing a perfluoroalkylene group. , A perfluoroalkylene group-containing silicon compound, and the like.
A docot layer is formed. Add the above compound to SiO ₂
A hard coat layer may be formed by adding a low-refractive-index agent such as fine particles of the above and converting the resin into a resin. The thickness of these fluorine-based low refractive index hard coat layers is 0.05 μm.
To 0.2 μm, more preferably 0.09 μm
m to 0.11 μm.

The high refractive index conductive hard coat layer containing the metal oxide of the present invention has a refractive index of 1.7 or more, preferably 1.8 or more, and has excellent transparency. It also has conductivity and has a pencil hardness of H or more after coating film formation, and it has a fluorine-based low-refractive-index hard coat layer and a metal compound or a metal layer or a primer layer. It also has excellent adhesion. Specific examples thereof include conductive fine particles such as ITO, tin oxide, and zinc oxide having an average particle diameter of 0.03 μm or less and / or an average particle diameter of 0.03 μm or less.
Containing 3μm following TiO _2, ZrO _2, high refractive index agent particles such as CeO _2, the composition of the resin used in the hard coat layer of the conventional can be used. The thickness of the high refractive index conductive hard coat layer containing these metal oxides is in the range of 1.0 μm to 10 μm. When the thickness is less than 1.0 μm, curing is difficult and the hardness is not sufficient. When the thickness is more than 10 μm, cracks in the layer and poor curing tend to occur. The fluorine-based low refractive index hard disk
High refractive index conductive hard disk containing metal layer and metal oxide
Antireflection performance is exhibited by lamination with the layer.

The monolayer and / or laminate comprising a metal compound and / or a metal used as a more preferred embodiment in the present invention is further laminated on a high refractive index conductive hard coat layer containing a metal oxide. A high refractive index conductive hard disk containing a metal oxide.
The layer has a function of complementing the electromagnetic wave shielding properties of the layer, and also has a function of blocking infrared rays. For example, tin oxide (tin oxide / zinc oxide, tin oxide / Barium sulfate, tin oxide / aluminum borate, tin oxide / potassium titanate, tin oxide / titanium oxide, tin oxide / antimony oxide, tin oxide / phosphorus),
A single layer and / or a laminate (a metal layer such as indium oxide / tin oxide or indium oxide / zinc oxide) and a metal layer such as gold, silver, and copper (for example, indium oxide / tin oxide and zinc oxide / zinc oxide). Layers).
The thickness of the layer must be in a range that does not impair transparency, and is in the range of 1 to 30 nm, preferably 3 to 20 nm. The single layer and / or the laminate comprising the metal compound and / or the metal may be formed by applying a composition containing the metal alkoxide of the above-described example or a composition containing fine particles having an average particle diameter of 0.03 μm or less. Alternatively, the above-described examples may be formed by means such as vapor deposition and sputtering.

The primer layer used as a more preferred embodiment in the present invention comprises a high refractive index conductive hard coat layer containing a metal oxide or a single layer and / or a laminate comprising a metal compound and / or a metal. It is used as needed to enhance the adhesion with the adhesive layer,
A polymer component having good adhesion to both a polymer component for forming an adhesive layer and a high refractive index conductive hard coat layer containing a metal oxide or a single layer and / or a laminate made of a metal compound and / or a metal. The thickness is preferably in the range of about 0.5 to 5 μm. Specific examples include acrylic resins, vinyl acetate resins,
Melamine-based resins, polyester-based resins, urethane-based resins, and the like.

The adhesive layer of the present invention is for adhering the transfer foil of the present invention to the display front plate, and is not particularly limited. For example, acrylic, vinyl acetate, vinyl chloride, styrene butadiene, Emulsion resins and organic solvent-based resins containing a resin such as vinyl chloride-vinyl acetate, ethylene-vinyl acetate, polyester, chlorinated rubber, chlorinated polypropylene, urethane, etc. alone or in combination, as a main component, water-soluble The resin is appropriately selected and adopted. The adhesive layer is formed by coating a coating solution obtained by diluting the resin with water or an organic solvent by a gravure printing method, a screen printing method, an offset printing method, or the like, using a high refractive index conductive hard coat layer containing a metal oxide or Coating and drying on a laminate or primer layer composed of a metal compound and metal (thermosetting resin,
It is formed by curing a curable coating film such as an ultraviolet curable resin, an electron beam curable resin, and a radiation curable resin. The thickness of the adhesive layer is not particularly limited, and is usually 0.3 to 20 μm.
It is appropriately selected and adopted from the range of the degree according to the surface condition of the front plate as the object to be transferred.

In the present invention, the adhesive layer preferably contains a near-infrared absorbing agent, whereby a transfer material for a display front plate having not only anti-reflection properties and electromagnetic wave shielding properties but also near-infrared shielding properties is provided. Obtainable. As the near-infrared absorbing agent, a diimonium-based compound, an aminium-based compound, a polymethine-based compound, a cyanine-based compound, an anthraquinone-based compound, or the like, or a mixture thereof is preferable. Among them, a diimonium-based compound is particularly preferable from the viewpoint of broad near-infrared absorption ability and transparency. An ordinary solvent such as gravure printing, screen printing, or offset printing is used to dissolve or disperse a paint dissolved in an organic solvent or water containing the resin for forming an adhesive layer and a near-infrared absorber as main components. An adhesive layer is formed by a method. The thickness of the (transparent) adhesive layer containing the near-infrared absorbing agent is not particularly limited, and is usually appropriately selected from the range of about 0.5 to 20 μm. The content of the near-infrared absorbing agent in the transparent near-infrared absorbing agent-containing adhesive layer is 0.05 to 1.0 g / m ² in accordance with the desired near-infrared absorbing effect.
Is selected as appropriate.

When the thickness of the transparent near-infrared absorbing layer is less than 0.5 μm, the content of the near-infrared absorbing agent in the transparent near-infrared absorbing layer must be increased in order to obtain the required near-infrared absorbing ability. However, it is not preferable in terms of deterioration of the film quality of the transparent near-infrared absorbing layer, coloring property, film thickness control and the like. 20 μm
Exceeding this is not preferable in terms of cost, film thickness control and the like. If the content of the near-infrared absorbing agent in the transparent near-infrared absorbing layer is less than 0.05 g / m ² , the desired near-infrared absorbing effect cannot be obtained, which is not preferable. ^{On the other hand} , if it exceeds 1.0 g / m ² , it is not preferable in terms of visible light transmittance and cost.

[0015]

The present invention will be described in detail below with reference to examples. ** Example On a biaxially stretched polyester film having a thickness of 50 μm, 5 parts of a silicon compound containing an acrylate perfluoroalkylene group at both terminals (hereinafter, unless otherwise specified, parts by weight), M
A solution composed of 50 parts of IBK (methyl isobutyl ketone) and 45 parts of MEK (methyl ethyl ketone) was applied by a reverse coating method and dried to form a 0.1 μm thick fluorine-based low refractive index hard coat layer. On this fluorine-based low refractive index hard coat layer, 1 part of a urethane acrylate resin, 5 parts of tin oxide having an average particle diameter of 0.03 μm, 2 parts of titanium oxide having an average particle diameter of 0.02 μm, and 0 part of an average particle diameter of 0 parts 2 parts of 0.03 μm zirconium oxide, toluene 40
And a solution of 50 parts of MEK were applied by a reverse coating method and dried to form a 3.5 μm thick high refractive index conductive hard coat layer. This high refractive index conductive core
An ITO (indium tin oxide) layer having a thickness of 30 nm was formed on the coat layer by magnetron sputtering. On the ITO (indium tin oxide) layer, a 10 nm-thick Ag.
An Au alloy layer (Ag: Au having a ratio of 8: 2) was formed. This Ag. An ITO (indium tin oxide) having a thickness of 30 nm is formed on the Au alloy layer by a magnetron sputtering method.
A layer was formed. Further, on the ITO (indium tin oxide) layer, ethylene. 10 parts of vinyl acetate resin, toluene 5
A solution consisting of 0 parts and 40 parts of MEK was applied by a reverse coating method and dried to form a primer layer having a thickness of 0.5 μm. On this primer layer, acrylic resin 2
A solution consisting of 5 parts, 0.5 parts of a diimonium-based near-infrared absorber, 100 parts of toluene, and 70 parts of MEK is applied by a reverse coating method and dried to form an adhesive layer having a thickness of 4.0 μm. Got.

<Evaluation Method> The following evaluation was performed on a sample obtained by transferring the transfer material obtained in the example to an acrylic plate. The results are shown below.

Transmittance; spectrophotometer UV-3100PC
The light transmittance at 550 nm was measured using (manufactured by Shimadzu Corporation). The unit is%.

Reflectance; spectrophotometer UV-3100PC
The light reflectance at 550 nm was measured using (manufactured by Shimadzu Corporation). The unit is%.

Pencil hardness: Measured according to JIS-K5400.

Steel wool resistance; steel wool.
At 0000, the surface low-refractive-index hard coat layer was rubbed to determine the degree of scratches. A: No scratch.
B: Slightly scratched. C: markedly damaged

Electromagnetic wave shielding: 1 to 100 according to KEC method (electric field mode), Kansai Electronics Promotion Center
The measurement was performed in the range of 0 MHz. The unit is dB.

Near infrared transmittance; spectrophotometer UV-31
Using 00PC (manufactured by Shimadzu Corporation), 800 nm to 12
The light transmittance at 00 nm was measured. The unit is%. ｛Results｝ Transmittance; 73 Reflectance; 1.0 Pencil hardness; 4H Steel wool resistance; A Electromagnetic wave shielding; 65 (20 MHz), 45 (100 MHz) Near infrared transmittance; 23 (800 nm), 8 (850 nm) , 2 (900 nm), 1 (950 nm) 1 (1000 nm), 2 (1050 nm) 3 (1100 nm), 3 (1150 nm) 3 (1200 nm)

[0023]

By using the transfer material of the present invention, the problems of physical properties, processing cost, productivity, appearance and the like in the conventional display front plate manufacturing method can be solved, and the antifouling property can be improved. Anti-reflective property, electromagnetic wave shielding property, near-infrared shielding property,
A transfer material for a display front panel excellent in processing cost, productivity, appearance, and the like can be provided.

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ identification code FI G02B 1/11 G02B 1/10 Z (58) Investigated field (Int.Cl. ⁷ , DB name) G09F 9/00 G02B 1 / 10-1/12

Claims (1)

(57) [Claims] An at least one fluorine-based low refractive index hard coat layer, a metal oxide-containing high refractive index conductive hard coat layer, a primer layer, and a near infrared absorber. And a bonding layer comprising: (a) an adhesive layer comprising: (a) a transfer material for a display front plate;