TWI609902B - Anti-glare hard coat film - Google Patents

Abstract

The present invention provides an anti-glare hard-coated film which can make the stylus feel good with the anti-glare hard-coated film itself, and at the same time, it is easy to erase the attached fingerprint. In order to solve the above-mentioned problems, an anti-glare hard-coated film 1 is provided as an anti-glare hardening for a touch panel including a base film 11 and an anti-glare hard coating layer 12 formed on one surface of the base film 11. Coating film 1, on the surface of the anti-glare hard coating layer 12, a stylus pen with a diameter of 0.5 mm at the tip of the pen is scanned at a speed of 100 mm / min under a load of 150 g under a pressure of 50 g / min. The initial value (A) and sliding value (B) satisfy the relationship of the following formula (a): 0 ≦ initial value (A)-sliding value (B) ... (a) At the same time, the surface of the anti-glare hard coating 12 The contact angle of oleic acid is above 45 °.

Description

Anti-glare hard coating film

The present invention relates to an anti-glare hard-coated film for a touch panel using a stylus.

In recent years, in various electronic devices, a touch panel having both a display device and an input means has been used. The surface of the touch panel is usually provided with a hard-coated film having a hard coating layer in order to prevent damage. In addition, various displays, including touch panels, reflect the light incident from the outside, making it difficult to see the displayed image. Therefore, the surface of the hard-coated film is roughened to use anti-glare functions. In the case of anti-glare hard-coated films.

Among the touch panels described above, in addition to input with a finger, there is also a touch panel with a stylus. Since the stylus is smaller than a finger, it can be accurately input. However, the display module of a touch panel is usually hard, and the surface of the touch panel on which the anti-glare hard coat film is formed is also hard. Therefore, the writing feeling of the stylus pen is different from that when writing on paper with a pencil, a ballpoint pen, or the like, and it is difficult to say that it is good.

In order to solve the above-mentioned problem of writing feeling, in Patent Document 1, by forming a cushioning adhesive layer between two substrates, the touch panel has a predetermined elastic deformability, thereby improving the writing feeling of the stylus. .

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Patent No. 2868686

However, in Patent Document 1, it is necessary to make the adhesive layer cushioning. Therefore, it is restricted by the material used for the adhesive layer, or the adhesive layer needs to be relatively thick. As a result, the manufacturing process becomes complicated, and at the same time, the manufacturing cost increases.

In addition, in the touch panel, even if a stylus input method is used, it is often touched by hand. Therefore, fingerprints are generally attached to the surface of the touch panel due to the grease on the fingers. If fingerprints are attached to the anti-glare hard-coated film, the appearance will be impaired, and the displayed image will be difficult to see. In addition, the conventional anti-glare hard coat film has a problem that it is difficult to erase the attached fingerprint.

The present invention has been made in view of such a situation, and an object of the present invention is to provide an anti-glare hard-coated film which can improve the writing feeling of a stylus pen by using the anti-glare hard-coated film itself and can easily erase the attached fingerprint.

In order to achieve the above object, first, the present invention provides an anti-glare hard-coated film, which is characterized by being used as a touch panel including a base film and an anti-glare hard coating layer formed on one surface of the base film. Anti-glare hard coating film. On the surface of the anti-glare hard coating, a stylus with a pen tip diameter of 0.5 mm and a stylus pen with a pen tip diameter of 0.5 mm is scanned at a speed of 100 mm / minute under a pressure of 150 g. The initial value (A) and sliding value (B) of the resistance (mN) satisfy the relationship of the following formula (a): 0 ≦ initial value (A) -sliding value (B) ... (a)

At the same time, the oleic acid contact angle on the surface of the anti-glare hard coat layer is 45 ° or more (Invention 1).

The anti-glare hard-coated film according to the above invention (Invention 1), the initial value (A) and the sliding value (B) of the pen tip resistance (mN) satisfy the above-mentioned relationship, and the touch can be made by the anti-glare hard-coated film itself. The writing feeling of the pen becomes good, and the contact angle of oleic acid is above 45 °, which makes the attached fingerprints easy to erase. In addition, the anti-glare hard coat film also tends to have excellent scratch resistance.

In the above invention (Invention 1), the initial value (A) and the slip value (B) of the pen tip resistance (mN) preferably satisfy the relationship of the following formula (b) (Invention 2).

5 ≦ initial value (A) -sliding value (B) ≦ 200 ... (b)

In the above invention (Invention 1, Invention 2), the oleic acid contact angle is preferably 45 ° to 100 ° (Invention 3).

In the above invention (Invention 1 to Invention 3), the antiglare hard coat layer is preferably a coating composition containing a polyfunctional (meth) acrylate, fine particles having an average particle diameter of 1 to 10 μm, and a leveling agent. It is solidified and comprised (invention 4).

In the above invention (Invention 1 to Invention 4), the fine particles are preferably amorphous silica particles (Invention 5).

The anti-glare hard-coated film of the present invention has a good writing feeling, and at the same time, the attached fingerprints are easily erased, and the scratch resistance also tends to be excellent.

1‧‧‧Anti-glare hard coating film

11‧‧‧ substrate film

12‧‧‧Anti-glare hard coating

FIG. 1 is a cross-section of an anti-glare hard coating film according to an embodiment of the present invention. Illustration.

FIG. 2 is a diagram showing an example of a measurement result of a pen tip resistance (an example of an anti-glare hard coat film according to the present embodiment).

FIG. 3 is a diagram showing another example of the measurement result of the pen tip resistance (an example of a general anti-glare hard coat film).

Hereinafter, embodiments of the present invention will be described.

As shown in FIG. 1, the anti-glare hard coat film 1 according to the present embodiment includes a base film 11 and an anti-glare hard coat layer 12 formed on one side of the base film 11. This anti-glare hard-coated film 1 is provided on the surface of a touch panel using a stylus.

Physical property

In the anti-glare hard coating film 1 according to this embodiment, a hard felt-core stylus with a pen tip diameter of 0.5 mm is placed on the surface of the anti-glare hard coating layer 12 (the side not in contact with the base film 11). The initial value (A) and the sliding value (B) of the pen tip resistance (mN) when scanning at a speed of 100 mm / min under a pressure of 150 g of a load satisfy the relationship of the following formula (a).

0 ≦ initial value (A) -sliding value (B) ... (a)

Here, the initial value of the pen tip resistance (A) refers to the value of the pen tip resistance displayed by the stylus at the start of scanning. As shown in FIG. 2 and FIG. 3, it is usually detected as a peak value. On the other hand, the pen tip resistance sliding value (B) refers to the pen tip resistance average value in a stable scanning state after the initial influence disappears. For example, the average value of the pen tip resistance with a scanning length of 10 mm to 40 mm in FIG. 2 is the sliding value (B). In addition, the average value of the pen tip resistance with a scanning length of 15 mm to 40 mm in FIG. 3 is a slip value (B).

As shown in the above formula (a), the value of subtracting the sliding value (B) from the initial value (A) (the difference in pen tip resistance (AB)) is 0 mN or more, and the anti-glare hard-coated film 1 does not particularly need to be provided The cushioning adhesive layer and the like can improve the writing feel of the stylus with the anti-glare hard coating film itself. This is considered to be because the relationship between the initial value (A) and the sliding value (B) is similar to the relationship when writing on paper with a pencil. From such a viewpoint, the lower limit of the value obtained by subtracting the sliding value (B) from the initial value (A) is preferably 5 mN or more, particularly preferably 10 mN or more, and still more preferably 20 mN or more. In addition, a general hard coating film having no unevenness on the surface does not show a specific initial value (A) due to the highest peak. In addition, in a general anti-glare hard coating film, as shown in FIG. 3, although the initial value (A) was observed, the pen tip resistance increased and the sliding value (B) became larger. The difference in the pen tip resistance (AB ), Usually shown as a negative value.

In addition, if the initial value (A) and the sliding value (B) satisfy the above-mentioned relationship, even if a stylus (for example, a polyacetal-core stylus) with a diameter different from that of the material of the hard felt-core stylus and the tip diameter is used In the case of), the effect of improving the writing feeling of the anti-glare hard coating film was also confirmed.

On the other hand, if the value of subtracting the sliding value (B) from the initial value (A) is too large, there is a problem that the pen tip is prone to wear, and there may be a feeling of getting stuck at the beginning or a sound. From such a viewpoint, the upper limit of the value obtained by subtracting the sliding value (B) from the initial value (A) is preferably 200 mN or less, particularly preferably 150 mN or less, and still more preferably 100 mN or less.

The initial value (A) is preferably 200 mN to 600 mN, particularly preferably 240 mN to 500 mN, and even more preferably 280 mN to 450 mN. On the other hand, the slip value (B) is preferably 100 mN to 550 mN, which is particularly excellent. It is selected from 150 mN to 490 mN, and more preferably 200 mN to 440 mN.

In addition, in the anti-glare hard coat film 1 according to this embodiment, the oleic acid contact angle on the surface of the anti-glare hard coat layer 12 is 45 ° or more, preferably 45 ° to 100 °, and particularly preferably 48 ° to 70 ° . In addition, the contact angle of oleic acid means that the droplets of oleic acid are placed on the surface of the anti-glare hard coating layer in a static state, and the droplets are connected to the ground of the hard coating surface of the droplets and the hard coating. The angle formed by the layer surface includes the angle of one side of the droplet.

The anti-glare hard-coated film 1 has an oleic acid contact angle of 45 ° or more, so that attached fingerprints can be easily erased (excellent fingerprint erasability). When the oleic acid contact angle is less than 45 °, the attached fingerprints become sharply difficult to erase. If the attached fingerprint is not easy to erase, the appearance of the touch panel is deteriorated, and at the same time, the display image becomes difficult to see. On the other hand, if the oleic acid contact angle exceeds 100 °, the initial value (A) and the sliding value (B) of the pen tip resistance tend to be difficult to satisfy the above conditions.

2. Anti-glare hard coating

The anti-glare hard coat layer 12 of the anti-glare hard coat film 1 in this embodiment is formed on any material as long as the initial physical resistance value (A), sliding value (B), and oleic acid contact angle exhibit the physical properties described above. Any of them may be formed by curing the coating composition C described below. With the coating composition C, the anti-glare hard coat layer 12 satisfying the above-mentioned physical properties is easily formed.

The coating composition C in this embodiment contains a polyfunctional (meth) acrylate, fine particles having an average particle diameter of 1 to 10 μm, and a leveling agent, and preferably further contains silicon dioxide nanometers having an average particle diameter of 1 to 300 nm. particle. In addition, in this specification, a (meth) acrylate means both an acrylate and a methacrylate. The same applies to other similar terms.

(1) Multifunctional (meth) acrylate

The coating composition C contains a polyfunctional (meth) acrylate as a curable main component. The polyfunctional (meth) acrylate is bridge-cured by irradiation with active energy rays. Since the polyfunctional (meth) acrylate is bridged and the bridging density is high, by using the polyfunctional (meth) acrylate, the anti-glare hard coat layer 12 can be formed to obtain the desired hardness and scratch resistance. Sex.

Examples of the polyfunctional (meth) acrylate include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and neopentyl glycol di (meth) acrylate. (Meth) acrylates, polyethylene glycol di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, dicyclopentyl di (meth) acrylate, caprolactone Dicyclopentenyl di (meth) acrylate, ethylene oxide modified phosphate di (meth) acrylate, allyl cyclohexyl di (meth) acrylate, isocyanurate di ( (Meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylic acid Ester, propylene oxide modified trimethylolpropane tri (meth) acrylate, tris (acrylic acid ethyl) isocyanurate, propionic acid modified dipentaerythritol penta (meth) acrylate, dipentaerythritol Hexa (meth) acrylate, caprolactone-modified dipentaerythritol hexa (meth) acrylate, etc. These may be used alone or in combination of two or more.

From the viewpoint of the scratch resistance of the anti-glare hard coat layer 12 and the transparency derived from the affinity with the leveling agent, the number of reactive functional groups of the polyfunctional (meth) acrylate is preferably 2 to 10, and particularly preferably 3 ~ 8.

(2) fine particles

The coating composition C contains fine particles having an average particle diameter of 1 to 10 μm. through The anti-glare hard coat layer 12 formed by containing such fine particles has a rough surface and exhibits an anti-glare function. The average particle diameter of the fine particles is preferably 2 μm to 8 μm, and particularly preferably 3 μm to 5 μm.

The particle size variation coefficient (CV value) of the fine particles shown in the following formula is preferably 10% to 70%, and particularly preferably 20% to 60%.

Coefficient of variation of particle size (CV value) = (standard deviation particle size / average particle size) × 100

When the CV value of the fine particles is in the above range, the writing feeling of the stylus pen becomes more favorable.

In addition, the average particle diameter and the coefficient of variation (CV value) of the particle diameter in this specification are a dispersion liquid of 5 mass% concentration prepared by a dispersant methyl ethyl ketone using a laser diffraction scattering type fineness distribution measuring device. As a sample, a value measured using a few drops.

The fine particles may be inorganic fine particles or organic fine particles, but from the viewpoint of the hardness of the anti-glare hard coat layer 12 formed, inorganic fine particles are preferred. Examples of the inorganic fine particles include fine particles composed of silicon dioxide, aluminum oxide, titanium oxide, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide, and the like. Among these, silicon dioxide fine particles are preferred. The fine particles may be used singly or in combination of two or more kinds.

The shape of the fine particles may be a fixed shape such as a spherical shape, but is preferably an amorphous shape having no specific shape. Amorphous particles are easier to satisfy the relationship between the initial value (A) and the sliding value (B) of the tip resistance than spherical particles, and the writing feel of the stylus pen becomes better. Therefore, the fine particles are particularly preferably fine particles of amorphous silica.

100% with respect to polyfunctional (meth) acrylate (or its cured product) The mixing ratio of the fine particles is preferably 1 part by mass to 50 parts by mass, particularly preferably 5 parts by mass to 30 parts by mass, and still more preferably 10 parts by mass to 20 parts by mass. When the blending ratio of the fine particles is 1 part by mass or more, the anti-glare hard coat layer 12 can be provided with desired anti-glare properties. In addition, if the blending ratio of the fine particles is 50 parts by mass or less, the coatability of the coating composition C becomes good, and an anti-glare hard coat layer 12 having a uniform film thickness can be formed.

(3) Levelling agent

The coating composition C according to this embodiment contains a leveling agent. The anti-glare hard coat layer 12 thus formed has no line-like defects, spots, or the like, has a uniform film thickness, and exhibits an excellent appearance.

Examples of leveling agents include silicone leveling agents, fluorine leveling agents, acrylic leveling agents, and vinyl leveling agents. Among these, leveling properties and compatibility with other components are considered. Of these, fluorine leveling agents and silicone leveling agents are preferred, and fluorine leveling agents are particularly preferred. The leveling agents may be used singly or in combination of two or more.

As the fluorine-based levelling agent, a compound having a perfluoroalkyl group or a fluorinated alkenyl group as a main chain or a side chain is preferably exemplified. Examples of commercially available products include BYK Japan's product BYK-340, NEOS 'product FTERGENT650A, DIC's product MEGAFAC RS-75, and Osaka Organic Chemical Industry's product V-8FM, but are not limited thereto.

The silicone-based levelling agent is preferably polydimethylsiloxane or modified polydimethylsiloxane, and particularly preferably polydimethylsiloxane. In addition, if the modification rate of the modified polydimethylsiloxane is high, in order to improve the appearance of the anti-glare hard coat layer 12 obtained by exhibiting leveling properties, the amount of addition thereof needs to be increased. As a result, formed The anti-glare hard coat layer 12 has a high sliding property, which cannot satisfy the relationship between the initial value (A) and the sliding value (B) of the pen tip resistance described above, and the writing feeling of the stylus pen may be reduced.

The blending ratio of the fluorine-based leveling agent is preferably 0.0005 to 10 parts by mass, and particularly preferably 0.001 to 5 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acrylate (or its cured product). It is more preferably 0.005 parts by mass to 1 part by mass. If the leveling ratio of the leveling agent is in the above range, the writing feeling of the stylus and the erasability of the fingerprint can be maintained, and the leveling effect can be fully obtained.

(4) Silicon dioxide nanoparticles

The coating composition C according to the present embodiment preferably contains silicon dioxide nanoparticles having an average particle diameter of 1 nm to 300 nm. When the coating composition C contains such silicon dioxide nanoparticles, the hardness of the anti-glare hard coat layer 12 formed is increased, and at the same time, glare can be suppressed. The average particle diameter of the silicon dioxide nanoparticles is preferably 5 nm to 100 nm, and particularly preferably 10 nm to 50 nm. The average particle diameter of the silicon dioxide nanoparticles is measured by a ZETA potential measurement method.

Silicon dioxide nanoparticles can be modified with organic substances for the purpose of improving dispersibility. It is also preferable that the silicon dioxide nanoparticles are in the form of an organosol (colloid). In the form of an organosol, the dispersibility of the silicon dioxide nanoparticles becomes good, and the homogeneity and light transmittance of the formed anti-glare hard coat layer 12 are improved.

Modification by an organic substance can be performed by a usual method. For example, a silane coupling agent having a structure such as CH ₂ = C (CH ₃ ) COO (CH ₂ ) ₃ Si (OCH ₃ ) ₃ can be added to an organosol of silicon dioxide nanoparticles, and heated at about 50 ° C. The surface of the silica particles was modified by stirring for several hours. The structure and amount of the silane coupling agent used can be appropriately selected according to the required degree of dispersibility of the silicon dioxide nanoparticles.

As a dispersion solvent of the said organosol, methyl ethyl ketone, methyl isobutyl ketone, etc. which are excellent in compatibility with a polyfunctional (meth) acrylate, a leveling agent, and the performance at the time of coating formation are preferable.

As the silicon dioxide nanoparticles, commercially available products can be used, and among them, organic silicon dioxide sol MEK-ST, MIBK-ST, etc., which are products of Nissan Chemical Co., are preferably used.

The blending ratio of the silica nanoparticles is preferably 1 to 50 parts by mass, and particularly preferably 2 to 20 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acrylate (or a cured product thereof). , More preferably 2 to 10 parts by mass. When the blending ratio of the silicon dioxide nanoparticles is 1 part by mass or more, the above-mentioned effect can be exhibited well. On the other hand, if the mixing ratio of the silicon dioxide nanoparticles is 50 parts by mass or less, aggregation of the silicon dioxide nanoparticles is suppressed, and the homogeneity and light transmission of the formed anti-glare hard coat layer 12 can be well maintained. Sex.

(5) Other ingredients

The coating composition C in this embodiment may contain various additives in addition to the above-mentioned components. Examples of the various additives include a photopolymerization initiator, an ultraviolet absorber, an oxidation inhibitor, a light stabilizer, an antistatic agent, a silane coupling agent, an anti-aging agent, a thermal polymerization inhibitor, a colorant, and a surfactant. , Storage stabilizer, plasticizer, lubricant, defoamer, organic filler, wettability improver, coating surface modifier, etc.

Examples of the photopolymerization initiator include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, and benzoin isobutyl Ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy 2-methyl-1-phenylpropane-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholin- Propane-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) one, benzophenone, p-phenylbenzophenone, 4,4'- Diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methylxanthone , 2-ethylxanthone, 2-chloroxanthone, 2,4-dimethylxanthone, 2,4-diethylxanthone, benzyldimethylketal, acetophenone Methyl ketal, p-dimethylaminobenzoate and the like. These may be used alone or in combination of two or more.

The blending ratio of the photopolymerization initiator is usually selected from a range of 0.2 to 10 parts by mass based on 100 parts by mass of the polyfunctional (meth) acrylate (or a cured product thereof).

By applying and curing the coating composition C described above on the base film 11, an anti-glare hard coat layer 12 satisfying the above-mentioned physical properties can be formed.

The thickness of the anti-glare hard coat layer 12 is preferably 1 μm to 15 μm, and particularly preferably 2 μm to 10 μm. When the thickness of the anti-glare hard coat layer 12 is within the above range, the scratch resistance and anti-glare function can be effectively exhibited.

3. Substrate film

The base film 11 may be appropriately selected from a base film for a touch panel suitable for using a stylus, and a plastic film having a good affinity with the anti-glare hard coat layer 12 is preferably selected.

Examples of the plastic film include polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyethylene films and polypropylene films And other polyolefin films; cellophane, diethyl cellulose film, triethyl cellulose film, cellulose ethyl butyrate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene -Vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polyfluorene film, polyetherketone film, polyetherfluorene film, polyfluorine film, fluororesin film, poly Amine film, acrylic resin film, polyurethane resin film, norbornene polymer film, cyclic olefin polymer film, cyclic conjugated diene polymer film, vinyl alicyclic polymer film, etc., or plastic film, or These laminated films. Among them, polyethylene terephthalate film, polycarbonate film, norbornene polymer film, and the like are preferred from the viewpoint of mechanical strength and the like.

In addition, the substrate film 11 may be formed on one surface or both surfaces for the purpose of improving adhesion to a layer (anti-glare hard coat layer 12, adhesive layer, etc.) to be formed on the surface thereof. The primer is subjected to a surface treatment according to an oxidation method, a bumping method, or the like. Examples of the oxidation method include corona discharge treatment, chromate treatment, flame treatment, hot air treatment, ozone · ultraviolet treatment, and examples of the bumping method include a sandblasting method and a solvent treatment method. These surface treatment methods can be appropriately selected depending on the type of the base film 11, but a corona discharge treatment method which is excellent in terms of effects and operability is generally used.

The thickness of the base film 11 is usually about 15 μm to 300 μm, and preferably about 30 μm to 200 μm.

4. Manufacturing method of anti-glare hard coating film

The anti-glare hard coat film 1 according to the present embodiment can be prepared by using the coating composition for the anti-glare hard coat layer 12, particularly, the coating composition C and a coating solution containing a solvent as needed in the base film 11. It is manufactured by coating and curing to form an anti-glare hard coat layer 12.

The solvent can be used for the purpose of improving the workability, adjusting the viscosity, adjusting the solid content concentration, and the like. If the solvent is a polyfunctional (meth) acrylate, a leveling agent, etc., it can be used without any limitation.

Specific examples of the solvent include alcohols such as methanol, ethanol, isopropanol, butanol, and octanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; Ethyl acetate, butyl acetate, ethyl lactate, γ-butyrolactone, etc .; ethylene glycol monomethyl ether (methyl cellosolve), ethylene glycol monoethyl ether (ethyl cellosolve), two Glycol monobutyl ether (butyl cellosolve), propylene glycol monomethyl ether, and other ethers; aromatic hydrocarbons such as benzene, toluene, and xylene; dimethylformamide, dimethylacetamide, and N-methylpyrrolidone And so on.

The coating composition coating liquid can be applied by a common method. For example, it can be performed by a bar coating method, a blade coating method, a roll coating method, a plate coating method, a die coating method, or a gravure coating method. When the coating liquid of the coating composition is applied, the coating film is preferably dried at 40 ° C. to 120 ° C. for about 30 seconds to 5 minutes.

Here, like the coating composition C, when the coating composition contains a leveling agent, the coating film coated with the coating composition has no line-like defects or spots, and therefore, it is possible to form a uniform film thickness and excellent appearance. Glare Hard Coating 12.

Like coating composition C, when the coating composition is active energy ray-curable, curing of the coating composition can be achieved by irradiating the coating film of the coating composition with active energy such as ultraviolet rays and electron beams under a nitrogen atmosphere. Line to proceed. The irradiation of ultraviolet rays can be performed by a high-pressure mercury lamp, a Fusion H lamp, a xenon lamp, and the like. The irradiation amount of ultraviolet rays is preferably 50 mW / cm ² to 1000 mW / cm ² and the light amount is about 50 mJ / cm ² to 1000 mJ / cm ² . On the other hand, the irradiation of the electron beam can be performed by an electron beam accelerator or the like, and the irradiation amount of the electron beam is preferably about 10 krad to 1,000 krad.

5. Other

In the anti-glare hard coat film 1 according to this embodiment, the anti-glare hard coat layer 12 is the outermost surface, and preferably has a base film 11 and an anti-glare hard coat layer 12, and the anti-glare hard coat layer 12 There may be another layer on the surface that is not in contact with the base film 11 or the anti-glare hard coat layer 12 of the base film 11. For example, an adhesive layer may be formed on the surface of the side which is not in contact with the anti-glare hard coat layer 12 of the base film 11, and a release sheet may be laminated on the adhesive layer.

The adhesive constituting the adhesive layer is not particularly limited, and known adhesives such as an acrylic adhesive, a rubber adhesive, and a silicone adhesive can be used. The adhesive layer need not have cushioning properties as described in Patent Document 1.

The arithmetic average surface illuminance (Ra) of the anti-glare hard coat layer 12 of the anti-glare hard coat film 1 according to this embodiment is preferably 0.01 μm to 10 μm, particularly preferably 0.1 μm to 1 μm, and more preferably 0.15 μm to 0.5 μm. When the arithmetic average surface illuminance (Ra) is within the above range, the anti-glare hard coat layer 12 can exhibit excellent anti-glare properties. The arithmetic average surface illuminance (Ra) in this specification is obtained from an illuminance curve measured using a contact-type illuminance meter (a Mitsubishi Corporation product SV3000S4 is used in the test example) based on JIS B0601-1994.

The anti-glare hard coat layer 12 of the anti-glare hard coat film 1 according to this embodiment is preferably made of steel wool of # 0000, and the anti-glare hard coat layer 12 is moved back and forth at 10 cm under a load of 250 g / cm ² . No scratches after rubbing 10 times. By having such scratch resistance evaluated from the hardness of steel wool, when the anti-glare hard coating film 1 is used on the surface of a touch panel, the occurrence of scratches on the anti-glare hard coating layer 12 can be suppressed.

The haze value of the anti-glare hard coat film 1 according to this embodiment is preferably 30% or less, particularly preferably 20% or less, and still more preferably 10% or less. If the haze value is less than 30%, it can be high-definition, which is suitable for use as a touch panel. From the viewpoint of exhibiting anti-glare properties, the haze value is preferably 0.5% or more, particularly preferably 2% or more, and still more preferably 6% or more. The haze value is a value measured based on JIS K7136-2000.

The embodiments described above are described for easy understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above embodiment includes all design changes and equivalents belonging to the technical scope of the present invention.

For example, in the anti-glare hard coat film 1, another layer may be interposed between the base film 11 and the anti-glare hard coat layer 12.

[Example]

Hereinafter, the present invention will be described in more detail through examples and the like, but the scope of the present invention is not limited by these examples and the like.

[Example 1]

As a polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (manufactured by Shin Nakamura Chemical Co., Ltd., NK ester A-DPH) (representing a solid content conversion value. Hereinafter, the same applies to other components.); Photopolymerization initiator, will be 1 -4.3 parts by mass of hydroxycyclohexyl phenone (manufactured by BASF, IRUGACURE 184); silica fine particles (manufactured by Fuji Silicon Chemicals, SYLOPHOBIC 702; average particle size: 4.1 μm, CV value 48%, amorphous) 11 mass As a levelling agent, 0.710 parts by mass of an acrylic compound containing a perfluoropolyether (fluorine leveling agent; manufactured by DIC, MEGAFAC RS-75) and silicon dioxide nanoparticles (manufactured by Nissan Chemical Industries, Ltd., MIBK-ST (average particle diameter: 10 nm) 8.3 parts by mass, and mixed to obtain a coating composition. This coating composition was diluted with propylene glycol monomethyl ether to prepare a coating liquid having a solid content concentration of 30%.

On the side of the easily-adhesive layer of the polyester film (COSMO SHINE A4300, thickness: 125 μm) with an easily-adhesive layer as the base film, the coating solution obtained above was coated with Wire. Bar # 10 was applied and dried at 70 ° C. for 1 minute. Next, an ultraviolet irradiation device (EYE GRANTAGEECS-401GX, manufactured by EYE GRAPHIC, Inc.) was used in a nitrogen atmosphere to irradiate ultraviolet rays under the following conditions to form an anti-glare hard coat layer having a thickness of 3 μm to obtain an anti-glare hard coat film. .

[UV irradiation conditions]

‧Light source: high temperature mercury lamp

‧Bulb power: 2kW

‧Conveyor speed: 4.23m / min

‧Illumination: 240mW / cm ²

‧Light quantity: 307mJ / cm ²

[Example 2]

An anti-glare hard coat film was produced in the same manner as in Example 1 except that the blending amount of the leveling agent was changed to 0.071 parts by mass to form an anti-glare hard coat layer.

[Example 3]

An anti-glare hard coat film was produced in the same manner as in Example 1 except that the blending amount of the leveling agent was changed to 0.007 parts by mass to form an anti-glare hard coat layer.

[Comparative Example 1]

In addition to using a polyether-modified polydimethylsiloxane (silicone levelling agent; BYK-UV3500, manufactured by BYK) as a leveling agent with an acryl group, the blending amount was changed to 0.710 parts by mass. An anti-glare hard coat film was formed in the same manner as in Example 1 except that the anti-glare hard coat layer was formed.

[Comparative Example 2]

In addition to using a polyether-modified polydimethylsiloxane (silicone leveling agent; BYK-UV3500, manufactured by BYK) as a leveling agent, the blending amount was changed to 0.071 parts by mass. An anti-glare hard coat film was formed in the same manner as in Example 1 except that the anti-glare hard coat layer was formed.

[Test Example 1] (Measurement of Pen Tip Resistance)

For the anti-glare hard-coated surface of the anti-glare hard-coated film produced in the examples and comparative examples, a universal tester (tensilon manufactured by ORIENTEC) and a stylus pen were used under a weight of 150 g. The test was performed under the condition that the pen tip touched the film surface and scanned at a speed of 100 mm / min. Then, in the obtained test chart, the initial value (A) and the sliding value (B) of the pen tip resistance were obtained. In addition, a value obtained by subtracting the sliding value (B) from the initial value (A) of the pen resistance is calculated. In addition, as the stylus, a stylus with a hard felt tip (wacom, ACK-2003, nib diameter: 0.5 mm) was used. The results are shown in Table 1.

[Test Example 2] (Evaluation of Writing Feeling)

The anti-glare hard-coated films produced in the examples and comparative examples were placed on a glass substrate with the anti-glare hard-coat side facing up. On the surface of the anti-glare hard coat layer of the anti-glare hard coat film, the same stylus as in Test Example 1 and a polyacetal-core stylus (pen tip diameter: 0.4 mm) were used to evaluate the writing feeling. In the evaluation, a sheet of paper (manufactured by KOKUYO Technology Co., Ltd., CAMPUS NOTE A lead wire NO-201A) was written with a pencil (MITSUBISHI PENCIL UNI B, manufactured by Mitsubishi Pencil Co., Ltd.) with a pen pressure of about 150 g The writing with a similar writing feeling at that time was good, and the writing with a large gap from the writing feeling was bad. In addition, the evaluation was performed by three panelists. When all three felt good, it was considered good, and when only one felt bad, it was considered bad. The results are shown in Table 1.

[Test Example 3] (Measurement of oleic acid contact angle)

The oleic acid contact angle on the surface of the anti-glare hard coat layer of the anti-glare hard coat film produced in the examples and comparative examples was measured using a fully automatic contact angle tester (produced by Kyowa Interface Science Co., Ltd., DM-701) Measured under the following conditions. As oleic acid, oleic acid manufactured by Tokyo Chemical Industry Co., Ltd. was used. The results are shown in Table 1.

‧ Droplet volume of oleic acid: 2μl

‧Measurement time: 3 seconds after dropping

‧Image analysis method: θ / 2 method

[Test Example 4] (Fingerprint Erasability Evaluation)

On the surface of the anti-glare hard-coated layer of the anti-glare hard-coated film produced in Examples and Comparative Examples, a finger was pressed firmly to leave a fingerprint, and this was used as a sample. In addition, three samples were prepared as samples, each of which was strongly pressed with one finger. After that, using waste paper (KIMWIPE S-200, manufactured by CRECIA, Japan) under a load of about 200 g, the surface of the anti-glare hard coating layer was moved back and forth 10 times. the result, In all the samples, the fingerprints were easily erased, and if only one sample had fingerprint residues after wiping, it was evaluated with ×. The results are shown in Table 1.

[Test Example 5] (Appearance Evaluation)

The anti-glare hard-coated films produced in the examples and comparative examples were evaluated with naked eyes for external appearances during reflection and transmission using a 3-wavelength fluorescent lamp. In the evaluation, those with few line-like defects or spots were regarded as good, and those with many line-like defects or spots were regarded as bad. The results are shown in Table 1.

[Test Example 6] (Measurement of Haze Value)

The haze value (%) of the anti-glare hard-coated film manufactured in the Example and the comparative example was measured using the haze meter (made by Nippon Denshoku Industries, NDH2000) based on JIS K7136-2000. The results are shown in Table 1.

[Test Example 7] (Measurement of surface illuminance)

The arithmetic mean surface illuminance (Ra; unit μm) of the anti-glare hard coat surface of the anti-glare hard coat film manufactured from the examples and comparative examples is based on JIS B0601-1994 using a contact-type illuminance meter (three The illuminance curve measured by Toyo Corporation, SV3000S4) was obtained. The results are shown in Table 1.

[Test Example 8] (Scratch Resistance Evaluation: Steel Wool Hardness)

The anti-glare hard coating surface of the anti-glare hard coating film manufactured in the examples and comparative examples was made of steel wool of # 0000 and rubbed back and forth at 10 cm under a load of 250 g / cm ² for 10 times. The surface of the glare hard coat layer was evaluated by the following criteria.

：: There was no change in appearance from before the test.

○: Although no scratches were observed, the anti-glare property was reduced due to the falling of the particles.

×: Linear scratches were seen.

As can be seen from Table 1, the anti-glare hard-coated film produced in the examples has a good writing feeling, and at the same time, the attached fingerprints are easily erased, and the appearance and anti-glare properties are also better.

[Industrial availability]

The anti-glare hard coat film of the present invention is suitable for use as a surface layer of a touch panel using a stylus.

1‧‧‧Anti-glare hard coating film

11‧‧‧ substrate film

12‧‧‧Anti-glare hard coating

Claims (5)

An anti-glare hard-coated film, which is an anti-glare hard-coated film for a touch panel including a base film and an anti-glare hard-coat layer formed on one side of the base film, and is characterized in that: The initial value (A) of the pen tip resistance (mN) when scanning a hard felt core stylus pen with a tip diameter of 0.5 mm under a glare hard coating surface under a pressure of 150 g under a pressure of 100 mm / min and The sliding value (B) satisfies the relationship of the following formula (a): 0 ≦ initial value (A) -sliding value (B) ... (a) At the same time, the oleic acid contact angle on the surface of the anti-glare hard coating layer is 45 ° or more. According to the anti-glare hard-coated film according to item 1 of the scope of the patent application, the initial value (A) and sliding value (B) of the pen tip resistance (mN) satisfy the relationship of the following formula (b): 5 ≦ initial value (A) -Slip value (B) ≦ 200 ... (b). According to the anti-glare hard coating film according to item 1 of the scope of the patent application, the contact angle of the oleic acid is 45 ° to 100 °. The anti-glare hard coat film according to item 1 of the scope of the patent application, wherein the anti-glare hard coat layer is a micro-particle containing polyfunctional (meth) acrylate, an average particle diameter of 1 μm to 10 μm, and a level dye. The coating composition of the additive is cured. The anti-glare hard coating film according to item 4 of the scope of the patent application, wherein the particles are amorphous silicon dioxide particles.