TW201444894A - Anti-glare hard coat film - Google Patents

Abstract

The present invention provides an anti-glare hard coat film providing excellent writing feeling by using the anti-glare hard coat film itself and allowing easy erasing of the attached fingerprint. To address the subject above, provided is an anti-glare hard coat film 1, which is an anti-glare hard coat film 1 for use in a touch panel and has a substrate film 11 and an anti-glare hard coat layer 12 formed on one side of the substrate film 11. To the surface of the anti-glare hard coat layer 12, a hard-felt core stylus with a tip diameter of 0.5 mm is applied with a pressure load of 150 g, wherein the initial value (A) of tip resistance (mN) at a scanning rate of 100 mm/min and the slide value (B) satisfy the following formula: 0 ≤ initial value (A) - slide value (B); meanwhile, the oleic acid contact angle of the anti-glare hard coat layer 12 surface is 45 degrees or above.

Description

Anti-glare hard coat film

The present invention relates to an anti-glare hard coat 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 frequently used. The surface of the touch panel is usually provided with a hard coat film having a hard coat layer in order to prevent damage. In addition, various displays including a touch panel reflect light incident from the outside, and it is difficult to see the displayed image. Therefore, the surface of the hard coat film is roughened, and the anti-glare function is imparted. The case of an anti-glare hard coat film.

In the touch panel as described above, in addition to the finger input, there is also a touch panel input by the stylus, and since the stylus is smaller than the finger, it can be accurately input. However, in general, the display module of the touch panel is rigid, 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 is different from the writing feeling when writing on paper with a pencil or a ballpoint pen, and it is difficult to say that it is good.

In order to solve the above-described problem of writing feeling, Patent Document 1 improves the writing feel of the stylus by forming a cushioning adhesive layer between the two substrates to provide the touch panel with a predetermined elastic deformability. .

[Previous Technical Literature] [Patent Literature]

Patent Document 1 Patent No. 2868686

However, in Patent Document 1, it is necessary to make the adhesive layer have cushioning properties. 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 when the stylus input method is used, there is often a case where it is touched by a hand. Therefore, on the surface of the touch panel, fingerprints are generally attached due to grease on the fingers. If the fingerprint is attached to the anti-glare hard-coated film, the appearance may be impaired, and at the same time, the displayed image becomes difficult to see. Further, in the conventional anti-glare hard coat film, there is a problem that it is difficult to erase the attached fingerprint.

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

In order to achieve the above object, the present invention provides an anti-glare hard coat film which is used as a touch panel including a base film and an anti-glare hard coat layer formed on one side of the base film. Anti-glare hard coating film, for the surface of the above-mentioned anti-glare hard coating layer, a hard felt core stylus with a pen tip diameter of 0.5 mm is scanned at a speed of 100 mm/min under a load of 150 g weight, the nib The initial value (A) of the resistance (mN) and the sliding value (B) satisfy the relationship of the following formula (a): 0≦ initial value (A)-sliding value (B)...(a)

Meanwhile, the oleic acid contact angle of the surface of the above-mentioned antiglare hard coat layer is 45 or more (Invention 1).

In the anti-glare hard coat film according to the invention (Invention 1), the initial value (A) of the tip resistance (mN) and the sliding value (B) satisfy the above relationship, and the hard-coated hard-coated film itself can be used for touch control. The pen's writing feel is good, and the oleic acid contact angle is above 45°, making the attached fingerprint easy to erase. Moreover, the anti-glare hard coat film also has excellent scratch resistance.

In the above invention (Invention 1), it is preferable that the initial value (A) and the sliding value (B) of the tip resistance (mN) 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 μm to 10 μm, and a leveling agent. It is cured to constitute (Invention 4).

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

The anti-glare hard coat film of the present invention has a good writing feeling, and the attached fingerprint is easily erased, and the scratch resistance is also excellent.

1‧‧‧Anti-glare hard coat film

11‧‧‧Base film

12‧‧‧Anti-glare hard coating

1 is a cross section of an anti-glare hard coat film according to an embodiment of the present invention; Figure.

FIG. 2 is a view showing an example of the measurement result of the nib resistance (an example of the antiglare hard coat film according to the embodiment).

Fig. 3 is a view showing another example of the measurement result of the tip resistance (for 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 antiglare hard coat film 1 of the present embodiment is composed of a base film 11 and an antiglare hard coat layer 12 formed on one surface of the base film 11. The anti-glare hard coat film 1 is provided on the surface of a touch panel using a stylus pen.

Physical property

The anti-glare hard coat film 1 of the present embodiment has a hard felt core stylus having a pen tip diameter of 0.5 mm on the surface of the anti-glare hard coat layer 12 (one side not in contact with the base film 11). The initial value (A) of the nib resistance (mN) and the sliding value (B) when scanning at a speed of 100 mm/min under a load of 150 g weight under load, satisfy the relationship of the following formula (a).

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

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

As shown in the above formula (a), the value of the sliding value (B) (the difference in the tip resistance (AB)) is 0 mN or more from the initial value (A), and the anti-glare hard coat film 1 is particularly unnecessary. The cushioning adhesive layer or the like can make the writing feeling of the stylus good by using the anti-glare hard coating film itself. It can be considered that this is the relationship between the initial value (A) and the sliding value (B), which is similar to the relationship when writing with a pencil on paper. From such a viewpoint, the lower limit of the value obtained by subtracting the slip value (B) from the initial value (A) is preferably 5 mN or more, particularly preferably 10 mN or more, and more preferably 20 mN or more. Further, on a general hard coat film having no unevenness on the surface, a specific initial value (A) due to the highest peak is not displayed. Further, in the general anti-glare hard coat film, as shown in FIG. 3, although the initial value (A) can be observed, the nib resistance increases thereafter, the slip value (B) becomes large, and the difference in the nib resistance (AB) ), usually shown as a negative value.

Further, if the initial value (A) and the sliding value (B) satisfy the above relationship, the stylus pen (for example, a polyacetal stylus pen) having a different diameter from the material of the hard felt core stylus and the tip of the pen is used. In the case of the case, the effect of improving the writing feeling of the antiglare hard coat film was also confirmed.

On the other hand, if the value of the sliding value (B) is subtracted from the initial value (A), if the value is too large, there is a problem that the tip of the pen is easily worn, and there is a possibility that the beginning portion is stuck or a sound is emitted. From such a viewpoint, the upper limit of the value of the sliding value (B) subtracted from the initial value (A) is preferably 200 mN or less, particularly preferably 150 mN or less, and more preferably 100 mN or less.

Further, the initial value (A) is preferably 200 mN to 600 mN, particularly preferably 240 mN to 500 mN, and still more preferably 280 mN to 450 mN. On the other hand, the above sliding 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 from 200 mN to 440 mN.

Further, in the antiglare hard coat film 1 of the present embodiment, the oleic acid contact angle of the surface of the antiglare hard coat layer 12 is 45 or more, preferably 45 to 100, and particularly preferably 48 to 70. . In addition, the oleic acid contact angle means that, on the surface of the anti-glare hard coat layer, droplets of oleic acid are left in a standing state, and droplets are connected to the ground portion of the surface of the hard coat layer of the liquid droplets and the hard coat layer. The angle formed by the surface of the layer includes the angle of one side of the droplet.

The anti-glare hard coat film 1 has an oleic acid contact angle of 45 or more, and the attached fingerprint is easily erased (excellent fingerprint erasability). If the oleic acid contact angle is less than 45, the attached fingerprint suddenly becomes difficult to erase. If the attached fingerprint is not easily erased, 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 nib resistance tend to satisfy the above conditions.

2. Anti-glare hard coating

In the anti-glare hard coat film 1 of the anti-glare hard coat film 1 of the present embodiment, any material can be formed as long as the initial value (A), the sliding value (B), and the oleic acid contact angle of the nib resistance can exhibit the above physical properties. All may be used, but it is preferably formed by curing the coating composition C described below. By the coating composition C, it is easy to form the anti-glare hard coat layer 12 which satisfies the above physical properties.

The coating composition C in the present embodiment contains a polyfunctional (meth) acrylate and fine particles and a leveling agent having an average particle diameter of 1 μm to 10 μm, and preferably further contains cerium oxide nanoparticles having an average particle diameter of 1 nm to 300 nm. particle. In the present specification, the term "(meth)acrylate" means both acrylate and methacrylate. The same is true for other similar terms.

(1) Polyfunctional (meth) acrylate

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

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

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

(2) Microparticles

The coating composition C contains fine particles having an average particle diameter of from 1 μm 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.

Further, the particle diameter variation coefficient (CV value) shown in the following formula is preferably 10% to 70%, and particularly preferably 20% to 60%.

Particle size variation coefficient (CV value) = (standard deviation particle size / average particle diameter) × 100

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

In addition, the coefficient of variation (CV value) of the average particle diameter and the particle diameter in the present specification is a 5% by mass concentration dispersion prepared by a dispersing agent methyl ethyl ketone by a laser diffraction scattering type fineness distribution measuring apparatus. As a sample, a value measured using a few drops was used.

The fine particles may be inorganic fine particles or organic fine particles, but inorganic fine particles are preferred from the viewpoint of the hardness of the antiglare hard coat layer 12 to be formed. Examples of the inorganic fine particles include fine particles composed of cerium oxide, aluminum oxide, titanium oxide, zirconium oxide, tin oxide, indium oxide, cadmium oxide, cerium oxide or the like. Among them, cerium oxide microparticles are preferred. Further, the fine particles may be used singly or in combination of two or more.

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. The amorphous microparticles are more likely to satisfy the relationship between the initial value (A) of the nib resistance and the sliding value (B) than the spherical microparticles, and the writing feeling of the stylus becomes better. Therefore, the above fine particles are particularly preferably amorphous ceria fine particles.

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

(3) Leveling agent

The coating composition C of the present embodiment contains a leveling agent. The antiglare hard coat layer 12 thus formed has no line defects or spots, and the like, and has a uniform film thickness and exhibits an excellent appearance.

Examples of the leveling agent include an anthrone leveling agent, a fluorine leveling agent, an acrylic leveling agent, and an ethylene leveling agent. Among them, from the viewpoint of leveling property and compatibility with other components, Preferably, a fluorine leveling agent and an anthrone leveling agent are used, and a fluorine leveling agent is particularly preferable. Further, the leveling agents may be used singly or in combination of two or more.

As the fluorine leveling agent, a compound having a perfluoroalkyl group or a fluorinated alkenyl group as a main chain or a side chain can be preferably used. The commercially available product is preferably BYK-340 of BYK Japan, FTERGENT 650A of NEOS, MEGAFAC RS-75 of DIC, and V-8FM of Osaka Organic Chemical Industry Co., Ltd., but is not limited thereto.

The anthrone leveling agent is preferably polydimethylsiloxane or modified polydimethylsiloxane, and particularly preferably polydimethyloxane. In addition, when the modified polydimethylsiloxane has a high modification rate, in order to make the appearance of the antiglare hard coat layer 12 which is obtained by leveling property excellent, it is necessary to increase the amount of addition. The result is formed The slidability of the anti-glare hard coat layer 12 is high, and the relationship between the initial value (A) of the tip resistance and the sliding value (B) cannot be satisfied, and the writing feeling of the stylus may be lowered.

The mixing ratio of the fluorine-based leveling agent is preferably 0.0005 parts by mass to 10 parts by mass, particularly preferably 0.001 parts by mass to 5 parts by mass, per 100 parts by mass of the polyfunctional (meth) acrylate (or a cured product thereof). More preferably, it is 0.005 mass part - 1 mass part. When the matching ratio of the leveling agent is in the above range, the writing sensation of the stylus and the fingerprint erasing property are maintained, and the leveling effect can be sufficiently obtained.

(4) cerium oxide nanoparticles

The coating composition C of the present embodiment preferably contains ceria nanoparticles having an average particle diameter of 1 nm to 300 nm. When the coating composition C contains such cerium oxide nanoparticles, the hardness of the antiglare hard coat layer 12 formed is improved, and glare can be suppressed. The average particle diameter of the above-mentioned ceria nanoparticles is preferably 5 nm to 100 nm, and particularly preferably 10 nm to 50 nm. Further, the average particle diameter of the cerium oxide nanoparticles was measured by ZETA potential measurement.

The cerium oxide nanoparticles can be modified by an organic substance for the purpose of improving dispersibility and the like. Further, the cerium oxide nanoparticles are preferably in the form of an organosol (colloidal). By dispersing the cerium oxide nanoparticles in the form of an organosol, the uniformity and light permeability of the formed anti-glare hard coat layer 12 are improved.

Modification by organic matter can be carried out using a usual method. For example, a decane coupling agent having a structure such as CH ₂ =C(CH ₃ )COO(CH ₂ ) ₃ Si(OCH ₃ ) ₃ may be added to the organosol of the cerium oxide nanoparticles and heated at about 50 ° C. The surface of the cerium oxide particles was modified by stirring for several hours. The structure and amount of the decane coupling agent to be used can be appropriately selected depending on the degree of dispersibility of the cerium oxide nanoparticles.

The dispersion solvent of the above-mentioned organosol is preferably methyl ethyl ketone or methyl isobutyl ketone which is excellent in compatibility with a polyfunctional (meth) acrylate and a leveling agent and exhibitability at the time of formation of a coating layer.

As the above-mentioned cerium oxide nanoparticles, commercially available products can be used. Among them, organic cerium oxide sol MEK-ST, MIBK-ST, and the like are preferably used.

The mixing ratio of the above-mentioned ceria nanoparticles is preferably from 1 part by mass to 50 parts by mass, particularly preferably from 2 parts by mass to 20 parts by mass, per 100 parts by mass of the polyfunctional (meth) acrylate (or a cured product thereof). Further, it is preferably 2 parts by mass to 10 parts by mass. When the mixing ratio of the above-mentioned ceria nanoparticles is 1 part by mass or more, the above effects can be satisfactorily exhibited. On the other hand, when the mixing ratio of the cerium oxide nanoparticles is 50 parts by mass or less, aggregation of the cerium oxide nanoparticles is suppressed, and the homogenization and light transmission of the formed anti-glare hard coat layer 12 can be favorably maintained. Sex.

(5) Other ingredients

The coating composition C in the present embodiment may contain various additives in addition to the above components. Examples of the various additives include a photopolymerization initiator, an ultraviolet absorber, an oxidation inhibitor, a photostabilizer, a charge prevention agent, a decane coupling agent, an anti-aging agent, a thermal polymerization inhibitor, a colorant, and a surfactant. , storage stabilizers, plasticizers, lubricants, defoamers, organic fillers, wettability improvers, coating surface modifiers, etc.

Examples of the photopolymerization initiator include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, and benzoin isobutyl group. Ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxyl -2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morphin- Propane-1-one, 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl)one, benzophenone, p-phenylbenzophenone, 4,4'- Diethylaminobenzophenone, dichlorobenzophenone, 2-methylhydrazine, 2-ethylhydrazine, 2-tert-butylhydrazine, 2-aminoindole, 2-methyl ketoxime , 2-ethyl sultone, 2-chlorosultone, 2,4-dimethyl ketoxime, 2,4-diethyl ketoxime, benzyl dimethyl ketal, acetophenone II Methyl ketal, p-dimethylaminobenzoate, and the like. These may be used alone or in combination of two or more.

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

By coating and solidifying the coating composition C described above on the base film 11, an antiglare hard coat layer 12 satisfying the above 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 in the above range, the scratch resistance and the 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 use with a stylus, and a plastic film having good affinity with the antiglare 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 film and polypropylene film. Polyolefin film; cellophane, diethylcellulose film, triethylene glycol film, cellulose ethoxylated butyrate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene - vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polyfluorene film, polyether ketone film, polyether ruthenium film, polyimine film, fluororesin film, poly a plastic film such as a guanamine film, an acrylic resin film, a urethane resin film, a norbornene polymer film, a cycloolefin polymer film, a cyclic conjugated diene polymer film, or a vinyl alicyclic hydrocarbon polymer film, or These laminated films. Among them, a polyethylene terephthalate film, a polycarbonate film, a norbornene polymer film or the like is preferable from the viewpoint of mechanical strength and the like.

In addition, in the base film 11, the adhesion to the layer formed on the surface (the anti-glare hard coat layer 12, the adhesive layer described later, etc.) may be improved, and may be carried out on one or both sides as needed. The primer treatment is carried out by a surface treatment according to an oxidation method, a roughening method, or the like. Examples of the oxidation method include a corona discharge treatment, a chromate treatment, a flame treatment, a hot air treatment, an ozone treatment, and an ultraviolet treatment. Examples of the unevenness 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 generally, a corona discharge treatment method excellent in effects and workability is used.

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

4. Method for manufacturing anti-glare hard coat film

In the anti-glare hard coat film 1 of the present embodiment, the coating composition for the anti-glare hard coat layer 12, particularly preferably the coating composition C and the coating liquid containing the solvent as needed, may be applied to the base film 11 It is coated and cured to form an anti-glare hard coat layer 12 to be produced.

The solvent can be used for improvement of workability, viscosity adjustment, adjustment of solid content concentration, etc., and in particular, it can be used without any limitation if the polyfunctional (meth) acrylate and the leveling agent are dissolved.

Specific examples of the solvent include alcohols such as methanol, ethanol, isopropanol, butanol, and octanol; and ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; Esters of ethyl acetate, butyl acetate, ethyl lactate, γ-butyrolactone, etc.; ethylene glycol monomethyl ether (methyl cellosolve), ethylene glycol monoethyl ether (ethyl cellosolve), two An ether such as glycerol monobutyl ether (butyl cellosolve) or propylene glycol monomethyl ether; an aromatic hydrocarbon such as benzene, toluene or xylene; dimethylformamide, dimethylacetamide, N-methylpyrrolidone Such as guanamines and the like.

The coating of the coating composition coating liquid can be carried out by a usual method, and can be carried out, for example, by a bar coating method, a knife coating method, a roll coating method, a sheet coating method, a die coating method, or a gravure coating method. When the coating liquid of the coating composition is applied, it is preferred to dry the coating film at 40 ° C to 120 ° C for about 30 seconds to 5 minutes.

Here, as in the case of the coating composition C, when the coating composition contains a leveling agent, the coating film to which the coating composition is applied does not have line-like defects or spots, and the like, therefore, it is possible to form a film having a uniform film thickness and excellent appearance. Dizzy hard coating 12.

When the coating composition is active energy ray-curable like the coating composition C, the coating composition can be cured by irradiating ultraviolet rays, electron beams, and the like on the coating film of the coating composition under a nitrogen atmosphere. Line to carry it out. The irradiation of ultraviolet rays can be carried out by a high pressure mercury lamp, a Fusion H lamp, a xenon lamp or the like, and the irradiation amount of the ultraviolet rays is preferably from 50 mW/cm ² to 1000 mW/cm ² and the amount of light is from 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 1000 krad.

5. Other

In the anti-glare hard coat film 1 of the present embodiment, the anti-glare hard coat layer 12 is the outermost surface, and preferably has the base film 11 and the anti-glare hard coat layer 12, and the anti-glare hard coat layer 12 There may be another layer on the surface on the side between the base film 11 and the anti-glare hard coat layer 12 of the base film 11. For example, an adhesive layer may be formed on the surface on the side 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 a known adhesive such as an acrylic adhesive, a rubber adhesive, or an anthrone adhesive can be used. Further, the adhesive layer does not need to have cushioning properties as described in Patent Document 1.

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

In the anti-glare hard coat layer 12 of the anti-glare hard coat film 1 of the present embodiment, it is preferable to use the steel wool of #0000 to apply the anti-glare hard coat layer 12 at 10 cm under a load of 250 g/cm ² . Rubbing 10 times does not produce scratches. When the antiglare hard coat film 1 is used for the surface of the touch panel with such scratch resistance evaluated by the hardness of the steel wool, scratches on the antiglare hard coat layer 12 can be suppressed.

In addition, the haze value of the antiglare hard coat film 1 of the present embodiment is preferably 30% or less, particularly preferably 20% or less, and further preferably 10% or less. When the haze value is 30% or less, it can be made high-definition, and it is suitable as a touch panel. Moreover, from the viewpoint of exhibiting anti-glare properties, the haze value is preferably 0.5% or more, particularly preferably 2% or more, and more preferably 6% or more. Further, the haze value is a value measured based on JIS K7136-2000.

The embodiments described above are described in order to facilitate understanding of the present invention, and are not intended to limit the present invention. Therefore, each of the elements disclosed in the above embodiments 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, other layers may be interposed between the base film 11 and the anti-glare hard coat layer 12.

[Examples]

The present invention will be specifically described by the following examples, but the scope of the present invention is not limited by the examples and the like.

[Example 1]

100 parts by mass of dipentaerythritol hexaacrylate (NK ester A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.) as a polyfunctional (meth) acrylate (indicating a solid content conversion value. Hereinafter, the same applies to other components); Photopolymerization initiator, will be 1 -Hydroxycyclohexyl phenyl ketone (IRUGACURE 184, manufactured by BASF Corporation) 4.3 parts by mass; cerium oxide microparticles (SYLOPHOBIC 702, manufactured by Fujisawa Chemical Co., Ltd.; average particle diameter: 4.1 μm, CV value: 48%, amorphous) 11 mass a leveling agent, an acrylate-based compound (fluorine leveling agent; MEGAFAC RS-75, manufactured by DIC Corporation) containing perfluoropolyether, and 0.710 parts by mass of cerium oxide 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. The coating composition was diluted with propylene glycol monomethyl ether to prepare a coating liquid having a solid concentration of 30%.

In the surface of the easy-adhesion layer of the polyester film (COSMO SHINE A4300, thickness: 125 μm, manufactured by Toyobo Co., Ltd.) which is a base film and an easy-adhesion layer, the above-mentioned coating liquid is obtained by Wire. Bar #10 coating, drying at 70 ° C for 1 minute. Then, an ultraviolet ray irradiation apparatus (EYE GRANTAGEECS-401GX type manufactured by EYE GRAPHIC Co., Ltd.) was used, and ultraviolet rays were irradiated under the following conditions to form an antiglare hard coat layer having a thickness of 3 μm to obtain an antiglare hard coat film. .

[UV irradiation conditions]

‧Light source: high temperature mercury lamp

‧Light bulb power: 2kW

‧ conveyor speed: 4.23m / min

‧ Illuminance: 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 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 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 the polyether-modified polydimethyl siloxane having an acryloyl group (an ketone leveling agent; BYK-UV3500, manufactured by BYK Co., Ltd.) was used as a leveling agent, and the amount thereof was changed to 0.710 parts by mass. An anti-glare hard coat film was produced in the same manner as in Example 1 except that an anti-glare hard coat layer was formed.

[Comparative Example 2]

In addition to a polyether modified polydimethyl siloxane having an acrylonitrile group (an ketone leveling agent; BYK-UV3500, manufactured by BYK Co., Ltd.) was used as a leveling agent, and the amount thereof was changed to 0.071 parts by mass. An anti-glare hard coat film was produced in the same manner as in Example 1 except that an anti-glare hard coat layer was formed.

[Test Example 1] (Measurement of Tip Resistance)

For the anti-glare hard coat surface of the anti-glare hard coat film produced in the examples and the comparative examples, a universal tester (TENSILON, manufactured by ORIENTEC Co., Ltd.) and a stylus were used, and a stylus was used under a weight of 150 g. The tip of the pen touched the surface of the film and was tested under the condition of scanning at a speed of 100 mm/min. Then, in the obtained test chart, the initial value (A) of the tip resistance and the sliding value (B) were obtained. In addition, the value of the sliding value (B) is subtracted from the initial value (A) of the tip resistance. Further, as the stylus pen, a stylus having a pen tip as a hard felt core (manufactured by WACOM Co., Ltd., ACK-2003, nib diameter: 0.5 mm) was used. The results are shown in Table 1.

[Test Example 2] (evaluation of writing feeling)

The antiglare hard coat film produced in the examples and the comparative examples was placed on the glass substrate with the antiglare hard coat layer side facing up. The surface of the anti-glare hard coat layer of the anti-glare hard coat film was evaluated by the same stylus as that of Test Example 1 and a stylus pen with a polyacetal core (tip diameter: 0.4 mm). In the evaluation, it will be written with a pencil (Mitsubishi Pencil Co., Ltd., MITSUBISHI PENCIL UNI B) with a weight of about 150g on a paper that is overlapped with five sheets (made by Kokuyo Technology Co., Ltd., CAMPUS NOTE A lead line NO-201A). The difference in writing feeling is good as well, and the difference in writing feeling is large as a defect. In addition, the evaluation was performed by a panelist of three people, and it was good when all three felt good, and it was a bad as long as one person felt bad. The results are shown in Table 1.

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

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

‧Low amount of oleic acid: 2μl

‧Measurement time: after 3 seconds of dripping

‧Image analysis method: θ/2 method

[Test Example 4] (Identification of fingerprint erasure)

On the surface of the anti-glare hard coat layer of the anti-glare hard coat film produced in the examples and the comparative examples, the fingers were pressed with force to leave a fingerprint and used as a sample. In addition, as a sample, three samples of three people each pressed with a finger were prepared. Thereafter, waste paper (KIMWIPE S-200, manufactured by Nippon Paper Industries Co., Ltd.) was used for 10 times on the surface of the anti-glare hard coat layer under a load of about 200 g. the result, The ○ which is easy to erase the fingerprint in all the samples is evaluated by × as long as one sample has fingerprint remaining after wiping. The results are shown in Table 1.

[Test Example 5] (Appearance evaluation)

The antiglare hard coat film produced in the examples and the comparative examples was evaluated by visual observation of the appearance at the time of reflection and at the time of transmission using a three-wavelength fluorescent lamp. In the evaluation, the number of line-like defects or spots was small, and the number of line-like defects or spots was bad. The results are shown in Table 1.

[Test Example 6] (Measurement of haze value)

The haze value (%) of the anti-glare hard coat film produced in the examples and the comparative examples was measured using a haze meter (NDH2000, manufactured by Nippon Denshoku Industries Co., Ltd.) 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 surface of the anti-glare hard coat layer of the anti-glare hard coat film produced in the examples and the comparative examples was based on JIS B0601-1994 to use a contact type illuminometer (three The illuminance curve measured by the company, SV3000S4) was obtained. The results are shown in Table 1.

[Test Example 8] (Scratch resistance evaluation: steel wool hardness)

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

◎: There was no change in appearance and test before.

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

×: A linear scratch was observed.

As is clear from Table 1, the anti-glare hard coat film produced in the examples had a good writing feeling, and the attached fingerprint was easily erased, and the appearance and the anti-glare property were further improved.

[Industrial Availability]

The antiglare hard coat film of the present invention is suitably used as a surface layer of a touch panel using a stylus pen.

1‧‧‧Anti-glare hard coat film

11‧‧‧Base film

12‧‧‧Anti-glare hard coating

Claims (5)

An anti-glare hard coat film comprising an anti-glare hard coat film for a touch panel comprising a base film and an anti-glare hard coat layer formed on one side surface of the base film, The surface of the glare hard coat layer, the initial value (A) of the tip resistance (mN) when the hard felt core stylus having a pen tip diameter of 0.5 mm is scanned at a speed of 100 mm/min under a load of 150 g weight. The sliding value (B) satisfies the relationship of the following formula (a): 0 ≦ initial value (A) - sliding value (B) (a) Meanwhile, the oleic acid contact angle of the surface of the above-mentioned anti-glare hard coat layer is 45 ° above. The anti-glare hard coat film according to the first aspect of the invention, wherein the initial value (A) of the nib resistance (mN) and the sliding value (B) satisfy the relationship of the following formula (b): 5 ≦ initial value (A) - Sliding value (B) ≦ 200... (b). The antiglare hard coat film according to Item 1, wherein the oleic acid contact angle is 45° to 100°. The anti-glare hard coat film according to the first aspect of the invention, wherein the anti-glare hard coat layer contains fine particles containing a polyfunctional (meth) acrylate and having an average particle diameter of from 1 μm to 10 μm and leveling The coating composition of the agent is cured to constitute. The antiglare hard coat film according to Item 4 of the invention, wherein the fine particles are amorphous ceria particles.