KR102269906B1 - Hard-coated antiglare film - Google Patents

Abstract

Provided is an anti-glare hard coating film that has a good writing feel of a touch pen and is easy to wipe off attached fingerprints.
An anti-glare hard coating film 1 for a touch panel having a base film 11 and an anti-glare hard coat layer 12 provided on one side of the base film 11, on the surface of the anti-glare hard coat layer 12 On the other hand, the initial value (A) and sliding value (B) of the pen tip resistance (mN) when a touch pen with a pen tip diameter of 0.5 mm is injected under pressure under a load of 150 g and a speed of 100 mm/min is obtained by the following formula At the same time satisfying the relationship of (a),
0≤initial value (A) - sliding value (B) … (a)
An anti-glare hard coating film (1) having an oleic acid contact angle of 45° or more on the surface of the anti-glare hard coating layer (12).

Description

Anti-glare hard coating film {Hard-coated antiglare film}

The present invention relates to an anti-glare hard coating film for a touch panel in which a touch pen is used.

In recent years, in various electronic devices, a touch panel that serves as both a display device and an input means has been widely used. A hard coat film having a hard coat layer is usually provided on the surface of the touch panel to prevent scratches. In addition, in various displays including a touch panel, since light incident from the outside may be reflected and the display image may be difficult to see, an anti-glare hard coat film to which an anti-glare function is imparted by roughening the surface of the hard coat film is used. There are cases.

In the touch panel as described above, in addition to performing input with a finger, input may be performed with a touch pen. According to the touch pen, an input operation thinner than a finger and with high precision is possible. However, normally, the display module of a touchscreen is hard, and the touchscreen surface which provided said anti-glare hard-coat film is also hard similarly. Therefore, it is difficult to say that the writing feeling by the touch pen is good, unlike the writing feeling when writing on paper with a pencil or a pen.

In order to solve the problem of the writing feel, in Patent Document 1, a cushioning adhesive layer is provided between two substrates to give the touch panel a predetermined elastic deformability, thereby improving the writing feel by the touch pen. have.

Patent Document 1: Japanese Patent Publication No. 2868686

However, in Patent Document 1, it is necessary to provide cushioning properties to the pressure-sensitive adhesive layer. Therefore, it is necessary to receive the restriction|limiting of the material used for this adhesive layer, or to make the adhesive layer comparatively thick. Thereby, while a manufacturing process becomes complicated, manufacturing cost becomes high.

Moreover, in the case of a touch panel, even if an input method is the case of a touch pen, there are many cases of touch. For this reason, it is common for fingerprints due to finger sweat to adhere to the surface of the touch panel. When a fingerprint adheres to an anti-glare hard-coat film, while an external appearance will worsen, a display image will become difficult to see. And in the conventional anti-glare hard-coat film, there existed a problem that it was difficult to wipe off the attached fingerprint.

The present invention was made in view of the actual situation, and an object of the present invention is to provide an anti-glare hard coat film in which the writing feel of the touch pen is good by the anti-glare hard coat film itself, and the anti-glare hard coat film is easy to wipe off the attached fingerprint.

In order to achieve the above object, the first present invention is an anti-glare hard coat film for a touch panel having a base film and an anti-glare hard coat layer provided on one side of the base film, the surface of the anti-glare hard coat layer Regarding the above, the initial value (A) and sliding value (B) of the pen tip resistance (mN) when a touch pen with a pen tip diameter of 0.5 mm was injected under pressure under a load of 150 g and at a speed of 100 mm/min. While satisfying the relationship of formula (a),

0≤Initial value(A)-Sliding value(B)　... (a)

It provides an anti-glare hard coating film, characterized in that the oleic acid contact angle of the surface of the anti-glare hard coating layer is 45° or more (Invention 1).

In the anti-glare hard coating film according to the invention (invention 1), the initial value (A) and the sliding value (B) of the pen tip resistance (mN) satisfy the above relationship, so that the anti-glare hard coating film itself is a touch pen. The writing feel becomes favorable, and when the oleic acid contact angle is 45 degrees or more, it becomes easy to wipe off an adhered fingerprint. Moreover, the said anti-glare hard-coat film tends to be excellent also in scratch resistance.

In the said invention (invention 1), it is preferable that the initial value (A) and sliding value (B) of the said pen tip resistance force (mN) satisfy|fill the relationship of following formula (b) (invention 2).

5≤Initial value(A)-Sliding value(B)≤200　... (b)

In the above inventions (Inventions 1 and 2), it is preferable that the oleic acid contact angle is 45° to 100° (Invention 3).

In the above inventions (Inventions 1 to 3), the anti-glare hard coating layer is preferably formed by curing a coating composition containing a polyfunctional (meth)acrylate, fine particles having an average particle diameter of 1 to 10 μm, and a leveling agent (Invention 4) ).

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

The anti-glare hard coat film according to the present invention has a good writing feel, is easy to wipe off an adhered fingerprint, and tends to be excellent in scratch resistance.

1 is a cross-sectional view of an anti-glare hard coat film according to an embodiment of the present invention.
It is a graph which shows an example (the example regarding the anti-glare hard-coat film by this embodiment) of the measurement result of pen point resistance.
3 is a graph showing another example of the measurement result of pen tip resistance (an example using a general anti-glare hard coat film).

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described.

As shown in FIG. 1, the anti-glare hard-coat film 1 which concerns on this embodiment consists of the base film 11 and the anti-glare hard-coat layer 12 formed in the one side of the base film 11. As shown in FIG. The anti-glare hard coating film (1) is to be installed on the surface of the touch panel used for the touch pen.

1. Physical properties

The anti-glare hard-coat film 1 by this embodiment is a hard felt core with a pen tip diameter of 0.5 mm with respect to the surface (surface on the side which does not contact the base film 11) of the anti-glare hard-coat layer 12. The initial value (A) and the sliding value (B) of the pen tip resistance (mN) when the touch pen is scanned at a speed of 100 mm/min under pressure under a load of 150 g satisfies the relation of the following formula (a).

0≤Initial value(A)-Sliding value(B)　... (a)

Here, the initial value (A) of the pen tip resistance force is a value of the pen tip resistance force indicated at the stage when the touch pen starts scanning, and is usually detected as a peak value as shown in Figs. 2 and 3 . On the other hand, the sliding value B of the pen point resistance means the average value of the pen point resistance force in a stable scanning state in which the influence of the initial movement is settled. For example, in FIG. 2, the average value of the pen point resistance of 10-40 mm of scanning length turns into sliding value B. On the other hand, in FIG. 3, the average value of the pen point resistance of 15-40 mm of scanning length turns into sliding value B.

As shown in the above formula (a), if the value (difference (AB) in pen point resistance) obtained by subtracting the sliding value (B) from the initial value (A) is 0 mN or more, the anti-glare hard coat film 1 is particularly cushioning. Even without providing a pressure-sensitive adhesive layer or the like having a glare-resistant hard coating film itself, the writing feel of the touch pen is good. This is considered to be because the relationship between the initial value A and the sliding value B becomes close 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, more preferably 10 mN or more, and particularly preferably 20 mN or more. Moreover, in the general hard-coat film which does not have an unevenness|corrugation on the surface, the initial value (A) specified by the peak top is not observed. Moreover, in a general anti-glare hard coat film, as shown in FIG. 3, although the initial value (A) is observed, since the pen point resistance increases and the sliding value (B) becomes large after that, the difference in the said pen point resistance force (AB) usually represents a negative value.

In addition, if the initial value (A) and the sliding value (B) satisfy the above relationship, a touch pen (for example, a touch pen with a polyacetal core) having a different material or pen tip diameter than the hard felt-based touch pen is used. Even when it does, the effect of the improvement of the writing feeling of an anti-glare hard-coat film is confirmed.

On the other hand, if the value obtained by subtracting the sliding value B from the initial value A is too large, there is a fear that the pen tip wears easily, and there is a possibility that there is a feeling of jamming or a sound when writing is started. 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 more preferably 100 mN or less.

Moreover, it is preferable that the said initial value (A) is 200-600mN, It is especially preferable that it is 240-500mN, It is still more preferable that it is 280-450mN. On the other hand, the sliding value B is preferably 100 to 550 mN, particularly preferably 150 to 490 mN, and more preferably 200 to 440 mN.

Moreover, in the anti-glare hard coat film 1 which concerns on this embodiment, the oleic acid contact angle of the anti-glare hard-coat layer 12 surface is 45 degrees or more, Preferably it is 45 degrees - 100 degrees, Especially preferably, it is 48 degrees. ~70°. In addition, the oleic acid contact angle refers to the angle between the tangent of the droplet at the ground portion of the surface of the hard coating layer of the droplet and the surface of the hard coating layer in a state where the droplet of oleic acid is left still on the surface of the anti-glare hard coating layer, on the side including the droplet say the angle.

When the anti-glare hard coat film 1 has an oleic acid contact angle of 45 degrees or more, it becomes possible to easily wipe off an adhered fingerprint (excellent in fingerprint wiping property). If this oleic acid contact angle is less than 45 degrees, it will become difficult to quickly wipe off an adhered fingerprint. If it is difficult to wipe off the attached fingerprint, the appearance of the touch panel deteriorates and the displayed image becomes difficult to see. On the other hand, when the oleic acid contact angle exceeds 100°, it tends to be difficult for the initial value (A) and the sliding value (B) of the pen tip resistance to satisfy the above-mentioned conditions.

2. Anti-glare hard coating layer

The anti-glare hard coating layer 12 of the anti-glare hard coating film 1 in this embodiment exhibits the above physical properties with respect to the initial value (A) and sliding value (B) of the pen tip resistance and the oleic acid contact angle, Although it may be formed of any material, it is preferably formed by hardening|curing the coating composition (C) demonstrated below. According to the coating composition (C), it is easy to form the anti-glare hard-coat layer 12 which satisfy|fills said physical property.

The coating composition (C) in this embodiment contains polyfunctional (meth)acrylate, microparticles|fine-particles with an average particle diameter of 1-10 micrometers, and a leveling agent, Preferably, it further contains silica nanoparticles with an average particle diameter of 1-300 nm. . In addition, in this specification, (meth)acrylate means both an acrylate and a methacrylate. The same is true for other similar terms.

(1) polyfunctional (meth)acrylate

The coating composition (C) contains polyfunctional (meth)acrylate as a curable main component. The polyfunctional (meth)acrylate is crosslinked and cured by irradiation with an active energy ray. Since what crosslinked polyfunctional (meth)acrylate has a high crosslinking density, the anti-glare hard-coat layer 12 formed by using the polyfunctional (meth)acrylate has desired hardness and scratch resistance.

Examples of the polyfunctional (meth)acrylate include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentylglycol di(meth)acrylate, polyethylene glycol Di(meth)acrylate, hydroxypivaric acid neopentyl glycol di(meth)acrylate, dicyclopentanyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified phosphoric acid Di(meth)acrylate, arylated 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)acrylate, propylene oxide modified trimethylolpropane tri(meth)acrylate, tris(acryloxyethyl) isocyanurate, propionic acid Modified dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, caprolactone modified dipentaerythritol hexa(meth)acrylate, etc. are mentioned. These may be used individually by 1 type, and may be used in combination of 2 or more type.

From the viewpoint of transparency due to the scratch resistance of the anti-glare hard coating layer 12 and affinity with the leveling agent, the number of functional groups of the polyfunctional (meth)acrylate is preferably 2 to 10, particularly 3 to 8 it is preferable

(2) fine particles

Coating composition (C) contains microparticles|fine-particles with an average particle diameter of 1-10 micrometers. By containing such microparticles|fine-particles, the surface of the anti-glare hard-coat layer 12 formed becomes rough, and exhibits an anti-glare function. It is preferable that the average particle diameter of the said microparticles|fine-particles is 2-8 micrometers, and it is especially preferable that it is 3-5 micrometers.

Moreover, it is preferable that it is 10 to 70 %, and, as for the coefficient of variation (CV value) of the particle diameter represented by the following formula of the said microparticles|fine-particles, it is especially preferable that it is 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 within the above range, the writing feel of the touch pen becomes better.

In addition, the average particle diameter and the coefficient of variation (CV value) of the particle diameter in the present specification use a laser diffraction scattering type particle size distribution analyzer, and a few drops of a dispersion of 5 mass % concentration prepared by methyl ethyl ketone as a dispersion medium is used as a sample. to the measured value.

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 to be formed, inorganic fine particles are preferable. Examples of the inorganic fine particles include fine particles made of silica, alumina, titanium dioxide, zirconium oxide, tin oxide, indium oxide, cadmium oxide, antimony oxide, and the like. Among these, silica fine particles are preferable. Moreover, microparticles|fine-particles may be used individually by 1 type, and may be used in combination of 2 or more type.

Although the shape of microparticles|fine-particles may be a fixed shape, such as a spherical shape, an irregular shape in which a shape is not specified is preferable. According to the amorphous microparticles|fine-particles, it becomes easier to satisfy|fill the relationship between the said initial value (A) and sliding value (B) of the said pen tip resistance than spherical microparticles|fine-particles, and the writing feeling of a touch pen becomes more favorable. Therefore, it is particularly preferable that the fine particles are amorphous silica fine particles.

It is preferable that the mixing ratio of the said microparticles|fine-particles with respect to 100 mass parts of polyfunctional (meth)acrylate (or its hardened|cured material) is 1-50 mass parts, It is especially preferable that it is 5-30 mass parts, It is also 10-20 mass parts more preferably. When the compounding ratio of the said microparticles|fine-particles is 1 mass part or more, desired anti-glare property can be provided to the anti-glare hard-coat layer 12 formed. Moreover, when the compounding ratio of the said microparticles|fine-particles is 50 mass parts or less, the coatability of a coating composition (C) becomes favorable, and it becomes possible to form the anti-glare hard-coat layer 12 of a uniform film thickness.

(3) Leveling agent

The coating composition (C) which concerns on this embodiment contains a leveling agent. Thereby, the anti-glare hard-coat layer 12 formed does not have a stripe-shaped defect, an irregularity, etc., becomes a film thickness uniform, and shows the outstanding external appearance.

As a leveling agent, a silicone type leveling agent, a fluorine type leveling agent, an acrylic type leveling agent, a vinyl type leveling agent etc. are mentioned, for example, Among them, from a viewpoint of leveling property and compatibility with another component, a fluorine type leveling agent and a silicone type A leveling agent is preferable, and a fluorine-type leveling agent is especially preferable. Moreover, a leveling agent may be used individually by 1 type, and may be used in combination of 2 or more type.

As a fluorine-type leveling agent, the compound which has a perfluoroalkyl group or a fluorinated alkenyl group in a main chain or a side chain is mentioned preferably. Examples of commercially available products include BYK-340 manufactured by Big Chemi Japan, Futergent 650A manufactured by Neos, Megapark RS-75 manufactured by DIC, and V-8 FM manufactured by Osaka Yugi Chemical Co., Ltd., but limited to these it's not going to be

The silicone-based leveling agent is preferably polydimethyl siloxane or modified polydimethyl siloxane, particularly preferably polydimethyl siloxane. Moreover, when the modification rate of modified polydimethyl siloxane is high, in order to exhibit leveling property and to make the external appearance of the anti-glare hard-coat layer 12 obtained suitable, it is necessary to increase the addition amount. As a result, the sliding performance of the formed anti-glare hard coating layer 12 is increased, and the relationship between the initial value (A) and the sliding value (B) of the pen tip resistance is not satisfied, and the writing feel of the touch pen is reduced. There are cases.

The blending ratio of the fluorine-based leveling agent to 100 parts by mass of the polyfunctional (meth)acrylate (or its cured product) is preferably 0.0005 to 10 parts by mass, particularly preferably 0.001 to 5 parts by mass, and 0.005 to 1 parts by mass more preferably. When the mixing ratio of the leveling agent is within the above range, the leveling effect can be sufficiently obtained while maintaining the writing feel and fingerprint wiping performance of the touch pen satisfactorily.

(4) silica nanoparticles

The coating composition (C) according to the present embodiment preferably contains silica nanoparticles having an average particle diameter of 1 to 300 nm. When the coating composition (C) contains such silica nanoparticles, the hardness of the anti-glare hard coat layer 12 to be formed increases, and glare can be suppressed. The average particle diameter of the silica nanoparticles is preferably 5 to 100 nm, particularly preferably 10 to 50 nm. In addition, the average particle diameter of silica nanoparticles shall be measured according to the zeta potential measurement method.

The silica nanoparticles may be modified with an organic material for the purpose of improving dispersibility or the like. Moreover, it is also preferable that a silica nanoparticle is the form of an organosol (colloidal state). By being in the form of an organosol, the dispersibility of a silica nanoparticle becomes favorable, and the homogeneity and light transmittance of the anti-glare hard-coat layer 12 formed are improved.

Modification with an organic substance can be performed according to a conventional method. For example, _{by adding a silane coupling agent having the same structure as CH 2} =C(CH ₃ )COO(CH ₂ ) ₃ Si(OCH ₃ ) ₃ to the organosol of silica nanoparticles, heating to about 50° C., and stirring for several hours , the surface of silica particles can be modified. The structure and amount of the silane coupling agent to be used are appropriately selected depending on the required degree of dispersibility of the silica nanoparticles.

As a dispersion solvent of the organosol, methyl ethyl ketone, methyl isobutyl ketone, etc., which are excellent in compatibility with polyfunctional (meth) acrylates and leveling agents and volatility at the time of forming a coating layer, are preferable.

As said silica nanoparticles, commercially available ones can be used, Among them, it is preferable to use organosilicasol MEK-ST, MIBK-ST, etc. manufactured by Nissan Chemical.

The mixing ratio of the silica nanoparticles to 100 parts by mass of the polyfunctional (meth)acrylate (or its cured product) is preferably 1 to 50 parts by mass, particularly preferably 2 to 20 parts by mass, and further 2 to 10 parts by mass It is more preferable to deny it. When the mixing ratio of the silica nanoparticles is 1 part by mass or more, the above-described effects are favorably exhibited. On the other hand, when the mixing ratio of the silica nanoparticles is 50 parts by mass or less, the aggregation of the silica nanoparticles can be suppressed, and the homogeneity and light transmittance of the anti-glare hard coating layer 12 to be formed can be maintained favorably.

(5) Other ingredients

The coating composition (C) in this embodiment may contain various additives other than said component. Various additives include, for example, a photopolymerization initiator, an ultraviolet absorber, an antioxidant, a light stabilizer, an antistatic agent, a silane coupling agent, an antioxidant, a thermal polymerization inhibitor, a colorant, a surfactant, a storage stabilizer, a plasticizer, a lubricant, an antifoaming agent, an organic type. A filler, a wettability improving agent, a drawing improving agent, etc. are mentioned.

Examples of the photopolymerization initiator include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2, 2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenyl propan-1-one, 1-hydroxycyclohexylphenyl ketone , 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 4-(2-hydroxyethoxy)phenyl-2(hydroxy-2-propyl)ketone , benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-t-butylanthraquinone, 2-aminoanthraquinone , 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoic acid ester etc. are mentioned. These may be used individually by 1 type, and may be used in combination of 2 or more type.

The compounding ratio of the said photoinitiator with respect to 100 mass parts of polyfunctional (meth)acrylates (or its hardened|cured material) is normally selected in 0.2-10 mass parts.

By applying the above-described coating composition (C) to the base film 11 and curing it, the anti-glare hard coating layer 12 capable of satisfying the above-described physical properties can be formed.

It is preferable that the thickness of the anti-glare hard-coat layer 12 is 1-15 micrometers, and it is especially preferable that it is 2-10 micrometers. When the thickness of the anti-glare hard coat layer 12 is in the above range, scratch resistance and anti-glare performance can be effectively exhibited.

3. Base film

As the base film 11, what is necessary is just to select suitably from what is suitable as an object for touch panels in which a touch pen is used, Preferably, the plastic film with favorable affinity with the anti-glare hard-coat layer 12 is selected.

Examples of such plastic films include polyester films such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyolefin films such as polyethylene films and polypropylene films, cellophane, diacetyl cellulose films, and triacetyl celluloses. Film, acetyl cellulose butyrate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, polyether Ether ketone film, polyethersulfone film, polyetherimide film, fluororesin film, polyamide film, acrylic resin film, polyurethane resin film, norbornene-based polymer film, cyclic olefin-based polymer film, cyclic conjugated diene-based polymer film, Plastic films, such as a vinyl alicyclic hydrocarbon polymer film, or those laminated|multilayer films are mentioned. Among them, from the viewpoint of mechanical strength and the like, a polyethylene terephthalate film, a polycarbonate film, a norbornene-based polymer film, and the like are preferable.

Moreover, in the said base film 11, in order to improve adhesiveness with the layer (anti-glare hard-coat layer 12, the adhesive layer mentioned later, etc.) provided on the surface, if desired, on one side or both sides, a primer The surface treatment can be performed by treatment, oxidation method, concavo-convexity method, or the like. Examples of the oxidation method include corona discharge treatment, chromic acid treatment, flame treatment, hot air treatment, ozone/ultraviolet treatment, and the like, and examples of the unevenness method include sandblasting method and solvent treatment method. . Although these surface treatment methods are suitably selected according to the kind of base film 11, in general, the corona discharge treatment method is preferably used from viewpoints, such as an effect and operability.

The thickness of the base film 11 is about 15-300 micrometers normally, Preferably it is about 30-200 micrometers.

4. Manufacturing method of anti-glare hard coating film

The anti-glare hard coat film (1) according to the present embodiment is a coating composition for the anti-glare hard coat layer (12), preferably a coating composition (C), and a coating liquid containing a solvent as desired, the base film ( 11), it can manufacture by apply|coating and hardening, and forming the anti-glare hard-coat layer 12.

A solvent can be used for improvement of coatability, viscosity adjustment, adjustment of solid content concentration, etc., If a polyfunctional (meth)acrylate, a leveling agent, etc. melt|dissolve, it can use without limitation in particular.

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; esters such as ethyl acetate, butyl acetate, ethyl lactate, and γ-butyrolactone; Ethers, such as ethylene glycol monomethyl ether (methyl cellosolve), ethylene glycol monoethyl ether (ethyl cellosolve), diethylene glycol monobutyl ether (butyl cellosolve), and propylene glycol monomethyl ether; aromatic hydrocarbons such as benzene, toluene, and xylene; Amides, such as dimethylformamide, dimethylacetamide, and N-methylpyrrolidone, etc. are mentioned.

The coating composition of the coating composition may be applied according to a conventional method, for example, a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, or a gravure coating method. After applying the coating solution of the coating composition, it is preferable to dry the coating film at 40 to 120° C. for about 30 seconds to 5 minutes.

Here, when the coating composition contains a leveling agent as in the coating composition (C), the coating film to which the coating composition is applied does not have stripe-like defects or irregularities, and therefore, the film thickness is uniform and the appearance is excellent. A hard coat layer 12 can be formed.

When the coating composition is active energy ray-curable like the coating composition (C), curing of the coating composition is performed by irradiating active energy rays such as ultraviolet rays or electron beams to the coating film of the coating composition under nitrogen atmosphere. Ultraviolet irradiation can be performed by a high-pressure mercury lamp, a fusion H lamp, a xenon lamp, etc., The irradiation amount of ultraviolet-ray is about 50-1000 mW/cm<^2> of illumination intensity, and about 50-1000 mJ/cm<^2> of light quantity is preferable. On the other hand, electron beam irradiation can be performed by an electron beam accelerator etc., The irradiation amount of an electron beam is about 10-1000 krad, and is preferable.

5. Others

As for the anti-glare hard-coat film 1 by this embodiment, the anti-glare hard-coat layer 12 becomes the outermost surface, and what is necessary is just to have the base film 11 and the anti-glare hard-coat layer 12, and an anti-glare hard-coat layer Between (12) and the base film 11, or in the surface of the side which does not contact the anti-glare hard-coat layer 12 of the base film 11, you may have another layer further. For example, an adhesive layer may be formed in the surface of the side which does not contact the anti-glare hard-coat layer 12 of the base film 11, and a release sheet may be laminated|stacked on the adhesive layer.

It does not specifically limit as an adhesive which comprises an adhesive layer, Well-known adhesives, such as an acrylic adhesive, a rubber-type adhesive, and a silicone adhesive, can be used. In addition, this adhesive layer does not need to have cushioning property as shown in patent document 1.

The arithmetic mean surface roughness (Ra) of the anti-glare hard coat layer 12 of the anti-glare hard coat film 1 according to the present embodiment is preferably 0.01 to 10 µm, particularly preferably 0.1 to 1 µm, and It is more preferable that it is 0.15-0.5 micrometer. When the arithmetic mean surface roughness (Ra) is in the above range, the anti-glare hard coat layer 12 exhibits excellent anti-glare properties. In addition, the arithmetic mean surface roughness (Ra) in this specification shall be calculated|required from the roughness curve measured using the contact-type roughness meter (In the test example, SV3000S4 manufactured by Mitsutoyo Co., Ltd. is used) based on JIS B0601-1994.

The anti-glare hard coating layer 12 of the anti-glare hard coating film 1 according to this embodiment is using a steel wool of #0000, and the anti-glare hard coating layer 12 at a load of ^{250 g/cm 2 10 cm, 10 reciprocating} It is desirable that rubbing does not cause scarring. By having the scratch resistance by evaluation of such steel wool hardness, when the anti-glare hard-coat film 1 is used for the surface of a touchscreen, it can suppress that the anti-glare hard-coat layer 12 is damaged.

Moreover, it is preferable that the haze value of the anti-glare hard coat film 1 by this embodiment is 30 % or less, It is more preferable that it is 20 % or less, It is especially preferable that it is 10 % or less. If the haze value is 30 % or less, high precision can be achieved and it becomes suitable as objects for touch panels. Moreover, it is preferable that it is 0.5 % or more from a viewpoint of exhibiting anti-glare property, It is more preferable that it is 2 % or more, It is especially preferable that it is 6 % or more. In addition, let the haze value be the value measured based on JISK7136-2000.

The embodiments described above are described in order to facilitate understanding of the present invention, and are not described in order to limit the present invention. Accordingly, each element disclosed in the above embodiments is intended to include all design changes and equivalents falling within the technical scope of the present invention.

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

Example

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

[Example 1]

100 parts by mass of dipentaerythritol hexaacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester A-DPH) as a polyfunctional (meth)acrylate (a solid content conversion value is shown. Hereinafter, the same applies to other components.); 4.3 parts by mass of 1-hydroxycyclohexylphenyl ketone (manufactured by BASF, Igacua 184) as a photoinitiator, and silica fine particles (manufactured by Fuji Silysia Chemical, Cyclophobic 702; average particle size of 4.1 µm, CV value of 48%, amorphous) 11 parts by mass and 0.710 parts by mass of a perfluoropolyether-containing acrylate-based compound as a leveling agent (fluorine-based leveling agent; manufactured by DIC, Megapark RS-75), and silica nanoparticles (manufactured by Nissan Chemical Industries, Ltd., MIBK-ST) , average particle diameter: 10 nm) 8.3 parts by mass were mixed to obtain a coating composition. The coating composition was diluted with propylene glycol monomethyl ether to prepare a coating solution having a solid content concentration of 30%.

On the side of the simple adhesive layer side of a polyester film with a simple adhesive layer as a base film (manufactured by Toyobo Co., Ltd., Cosmoshine A4300, thickness: 125 μm), the coating solution obtained above is applied with a wire bar #10, and applied at 70° C. for 1 minute dried. Then, in a nitrogen atmosphere, ultraviolet rays are irradiated under the following conditions with an ultraviolet irradiation device (manufactured by EyeGraphix, Eye Grantage ECS-401 GX type) to form an anti-glare hard coat layer with a thickness of 3 µm, and an anti-glare hard A coating film was obtained.

[Ultraviolet irradiation conditions]

·Light source: high pressure mercury lamp

·Lamp power: 2kW

Conveyor speed: 4.23m/min

· Illuminance: 240mW/cm ²

·Light intensity: 307mJ/cm ²

[Example 2]

Except having changed the compounding quantity of a leveling agent into 0.071 mass parts and having formed the anti-glare hard-coat layer, it carried out similarly to Example 1, and manufactured the anti-glare hard-coat film.

[Example 3]

Except having changed the compounding quantity of a leveling agent to 0.007 mass part and having formed the anti-glare hard-coat layer, it carried out similarly to Example 1, and produced the anti-glare hard-coat film.

[Comparative Example 1]

As a leveling agent, polyether-modified polydimethylsiloxane having an acryloyl group (silicone-based leveling agent; BYK-UV3500 manufactured by Bikchemi Co., Ltd.) was used, and the blending amount was changed to 0.710 parts by mass to form an anti-glare hard coat layer. It carried out similarly to Example 1, and produced the anti-glare hard-coat film.

[Comparative Example 2]

As a leveling agent, polyether-modified polydimethyl siloxane having an acryloyl group (silicone-based leveling agent; BYK-UV3500 manufactured by Bikchemi Co., Ltd.) was used, and the blending amount was changed to 0.071 parts by mass to form an anti-glare hard coating layer. It carried out similarly to Example 1, and produced the anti-glare hard-coat film.

[Test Example 1] (Measurement of pen tip resistance)

For the surface of the anti-glare hard coating layer of the anti-glare hard coating film prepared in Examples and Comparative Examples, using a universal testing machine (Orientec Co., Ltd., Tenshiron) and a touch pen, the pen tip of the touch pen on the film surface under a load of 150 g The test was performed under the conditions of pressing and scanning at a speed of 100 mm/min. And the initial value (A) and sliding value (B) of the pen point resistance were calculated|required from the obtained measurement chart. Moreover, the value which subtracted the sliding value (B) from the initial value (A) of pen point resistance was computed. In addition, as a touch pen, the touch pen (the Wacom company make, ACK-2003, pen tip diameter 0.5mm) was used for the pen point of a hard felt core. A result is shown in Table 1.

[Test Example 2] (Evaluation of writing feel)

The anti-glare hard coat film prepared in Examples and Comparative Examples was placed on the glass substrate with the anti-glare hard coat layer side facing up. The surface of the anti-glare hard coat layer of the anti-glare hard coat film was evaluated for each writing feeling using the same touch pen as in Test Example 1 and a polyacetal-based touch pen (pen tip diameter of 0.4 mm). In the evaluation, the writing feeling when writing with a writing pressure of about 150 g using a pencil (Mitsubishi Enfiz, Mitsubishi Enfitsu Uni B) on 5-ply paper (manufactured by Kokuyo S&T, Campus Note A ruled line No-201A) The thing close to ' was regarded as good, and the thing which fell out of the writing feeling was made into bad. In addition, evaluation was performed by three panelists, what all three felt as favorable, and what felt that even one person felt it was made into bad|defective. A result is 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 coating layer of the anti-glare hard coating film produced in Examples and Comparative Examples was measured under the following conditions using a fully automatic contact angle measuring meter (manufactured by Kyowa Kaimen Chemical Co., Ltd., DM-701). . As the oleic acid, oleic acid manufactured by Tokyo Chemical Industry Co., Ltd. was used. A result is shown in Table 1.

・Drop volume of oleic acid: 2 μl

・Measurement time: 3 seconds after dripping

・Image analysis method: θ/2 method

[Test Example 4] (Fingerprint wiping performance evaluation)

A finger was pressed on the surface of the anti-glare hard-coat layer of the anti-glare hard-coat film manufactured by the Example and the comparative example, the fingerprint was made to adhere, and this was made into the sample. Moreover, as a sample, 3 people prepared 3 samples which pressed a finger once each. Then, the anti-glare hard-coat layer surface was made to reciprocate 10 with the load of about 200 g using the paper swath (The Nippon Sey Clay company make, Kimwipe S-200). As a result, for all the samples, those in which fingerprints were easily wiped were evaluated as (circle) and that in even one of the samples, wiped residues of fingerprints were generated as ×. A result is shown in Table 1.

[Test Example 5] (Evaluation of appearance)

About the anti-glare hard-coat film manufactured by the Example and the comparative example, the visual appearance at the time of reflection and transmission was evaluated using a 3-wavelength fluorescent lamp. In evaluation, the thing with few stripe-like faults and irregularity was made into favorable, and the thing with many stripe-like flaws and irregularity was made into defect. A result is shown in Table 1.

[Test Example 6] (Measurement of haze value)

The haze value (%) of the anti-glare hard coat film manufactured by the Example and the comparative example was measured based on JIS K7136-2000 using the haze meter (Nippon Denshoku Kogyo make, NDH2000). A result is shown in Table 1.

[Test Example 7] (Measurement of surface roughness)

The arithmetic mean surface roughness (Ra; unit μm) of the surface of the anti-glare hard coating layer of the anti-glare hard coating film prepared in Examples and Comparative Examples was measured in accordance with JIS B0601-1994, a contact-type roughness meter (manufactured by Mitsutoyo, SV3000S4) It calculated|required from the roughness curve measured using it. A result is shown in Table 1.

[Test Example 8] (Evaluation of scratch resistance: Steel wool hardness)

For the surface of the anti-glare hard coating layer of the anti-glare hard coating film prepared in Examples and Comparative Examples, using a steel wool of #0000, 10 cm, 10 reciprocating rubs with a load of ^{250 g / cm 2, the anti-glare hard coating layer} The surface was evaluated on the basis of the following criteria.

(double-circle): There is no change at all in appearance from before a test.

(circle): Although a wound was not observed, anti-glare property fell by drop-off|omission of particle|grains.

x: A linear wound was observed.

Pen tip resistance (mN) writing texture
Exterior
Haze value (%)
Fingerprint
wipe off
Performance
oleic acid
Contact angle (°)
Ra
(μm)
scratch resistance initial equinox
(A) sliding teeth
(B) A-B hard
felt
core Poly
acetalsim Example 1 353 323 30 Good Good Good 8.6 ○ 68.6 0.21 ◎ Example
2 397 338 59 Good Good Good 9.8 ○ 62.1 0.24 ◎ Example
3 412 338 74 Good Good Good 9.7 ○ 54.3 0.23 ◎ comparative example
One 265 323 -58 bad bad Good 10.4 ○ 48.6 0.26 ◎ comparative example
2 279 323 -44 bad bad Good 10.1 × 41.3 0.24 ◎

As is clear from Table 1, the anti-glare hard coat film manufactured in the Example had a good writing feeling, and it was easy to wipe off an adhered fingerprint, and also an external appearance and anti-glare property were favorable.

The anti-glare hard coating film of the present invention is suitably used as a surface layer of a touch panel in which a touch pen is used.

One… Anti-glare hard coating film
11… base film
12… Anti-glare hard coating layer

Claims (6)

An anti-glare hard coat film for a touch panel comprising a base film and an anti-glare hard coat layer provided on one side of the base film,
With respect to the surface of the anti-glare hard coating layer, the initial value (A) of the pen tip resistance (mN) when a touch pen with a pen tip diameter of 0.5 mm is injected with a hard felt core under pressure under a load of 150 g at a speed of 100 mm/min, and While the sliding value (B) satisfies the relationship of the following formula (b),
5≤Initial value(A)-Sliding value(B)≤200 ... (b)
Anti-glare hard coating film, characterized in that the contact angle of oleic acid on the surface of the anti-glare hard coating layer is 45° or more. delete According to claim 1,
Anti-glare hard coating film, characterized in that the oleic acid contact angle is 45 ° ~ 100 °. According to claim 1,
The anti-glare hard coating layer is
polyfunctional (meth)acrylate,
fine particles having an average particle diameter of 1 to 10 μm;
leveling agent
Anti-glare hard coating film, characterized in that made by curing the coating composition containing. 5. The method of claim 4,
The anti-glare hard coating film, characterized in that the fine particles are amorphous silica fine particles. An anti-glare hard coat film for a touch panel comprising a base film and an anti-glare hard coat layer provided on one side of the base film,
With respect to the surface of the anti-glare hard coating layer, the initial value (A) of the pen tip resistance (mN) when a touch pen with a pen tip diameter of 0.5 mm is injected with a hard felt core under pressure under a load of 150 g at a speed of 100 mm/min, and While the sliding value (B) satisfies the relation of the following formula (a),
0≤initial value (A) - sliding value (B) … (a)
The oleic acid contact angle of the surface of the anti-glare hard coating layer is 45° or more,
In the anti-glare hard coating layer, the surface on the opposite side to the base film is rubbed with #0000 steel wool at a load of 250 g/cm 2 in 10 cm, 10 reciprocating motions, characterized in that the surface is not damaged. hard coating film.

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