JP6174378B2 - Anti-glare hard coat film - Google Patents

Description

  The present invention relates to an antiglare hard coat film for a touch panel in which a touch pen is used.

  In recent years, in various electronic devices, a touch panel that serves both as a display device and an input unit has been used. A hard coat film having a hard coat layer is usually provided on the surface of the touch panel to prevent scratches. Also, in various displays including touch panels, light incident from the outside may be reflected to make it difficult to see the displayed image. Therefore, the surface of the hard coat film is roughened to provide an antiglare function. Hard coat film may be used.

  In the touch panel as described above, there is an input operation using a touch pen in addition to an input operation using a finger. According to the touch pen, an input operation that is finer and more accurate than a finger is possible. However, the display module of a touch panel is usually hard, and the touch panel surface provided with the antiglare hard coat film is also hard. Therefore, the writing taste with a touch pen is not good, unlike the writing taste when writing on paper with a pencil or pen.

  In order to solve the above-mentioned problem of writing quality, Patent Document 1 provides a writing quality with a touch pen by providing a pressure-sensitive adhesive layer having cushioning properties between two base materials and giving the touch panel predetermined elastic deformation. Has improved.

Japanese Patent No. 2868686

  However, in patent document 1, it is necessary to give cushioning properties to an adhesive layer. Therefore, it is necessary to be restricted by the material used for the pressure-sensitive adhesive layer or to make the pressure-sensitive adhesive layer relatively thick. This complicates the manufacturing process and increases the manufacturing cost.

  In addition, touch panels are often touched by hand even when the input method is a touch pen. For this reason, it is normal for fingerprints to adhere to the surface of the touch panel. When fingerprints adhere to the antiglare hard coat film, the appearance is deteriorated and the display image is difficult to see. The conventional antiglare hard coat film has a problem that it is difficult to wipe off the attached fingerprint.

  The present invention has been made in view of such a situation, and provides an anti-glare hard coat film that has good touch pen writing quality with an anti-glare hard coat film itself and that can easily wipe off attached fingerprints. For the purpose.

In order to achieve the above object, first, the present invention provides an antiglare property for a touch panel comprising a base film and an antiglare hard coat layer provided on one surface side of the base film. A hard coat film, wherein the surface of the antiglare hard coat layer is scanned with a hard felt core touch pen having a pen tip diameter of 0.5 mm under a load of 150 g weight and at a speed of 100 mm / min. The initial value (A) and sliding value (B) of the tip resistance force (mN) satisfy the relationship of the following formula (a),
0 ≦ initial movement value (A) −sliding value (B) (a)
Provided is an antiglare hard coat film characterized in that an oleic acid contact angle on the surface of the antiglare hard coat layer is 45 ° or more (Invention 1).

  The anti-glare hard coat film according to the above invention (invention 1) has an anti-glare hard coat when the initial movement value (A) and sliding value (B) of the nib resistance (mN) satisfy the above relationship. The writing quality of the touch pen is good with the film itself, and when the oleic acid contact angle is 45 ° or more, the attached fingerprint can be easily wiped off. Furthermore, the antiglare hard coat film tends to be excellent in scratch resistance.

In the above invention (Invention 1), the initial movement value (A) and the sliding value (B) of the nib resistance (mN) satisfy the relationship of the following formula (b): 5 ≦ initial movement value (A) −sliding Dynamic value (B) ≦ 200 (b)
It is preferable (Invention 2).

  In the said invention (invention 1 and 2), it is preferable that the said oleic acid contact angle is 45 degrees-100 degrees (invention 3).

  In the said invention (invention 1-3), the said anti-glare hard-coat layer hardens the coating composition containing polyfunctional (meth) acrylate, microparticles | fine-particles with an average particle diameter of 1-10 micrometers, and a leveling agent. (Invention 4)

  In the said invention (invention 1-4), it is preferable that the said microparticle is an amorphous silica microparticle (invention 5).

  The antiglare hard coat film according to the present invention has a good writing quality, and it is easy to wipe off the attached fingerprint, and further has excellent tendency to scratch resistance.

It is sectional drawing of the glare-proof hard coat film which concerns on one Embodiment of this invention. It is a graph which shows an example (example regarding the glare-proof hard coat film concerning this embodiment) of a measurement result of nib resistance. It is a graph which shows the other example (example regarding a general anti-glare hard coat film) of the measurement result of nib resistance.

Hereinafter, embodiments of the present invention will be described.
As shown in FIG. 1, the antiglare hard coat film 1 according to this embodiment includes a base film 11 and an antiglare hard coat layer 12 formed on one surface of the base film 11. This anti-glare hard coat film 1 is provided on the surface of a touch panel in which a touch pen is used.

1. Physical Properties The antiglare hard coat film 1 according to the present embodiment has a hard felt core having a nib diameter of 0.5 mm with respect to the surface of the antiglare hard coat layer 12 (the surface not in contact with the base film 11). The initial movement value (A) and sliding value (B) of the pen tip resistance force (mN) when the touch pen is scanned at a speed of 100 mm / min under a load of 150 g load satisfy the relationship of the following formula (a). .
0 ≦ initial movement value (A) −sliding value (B) (a)

  Here, the initial value (A) of the pen tip resistance is a value of the pen tip resistance shown when the touch pen starts scanning, and is detected as a normal peak value as shown in FIGS. . On the other hand, the sliding value (B) of the pen tip resistance means an average value of the pen tip resistance in a stable scanning state where the influence of the initial movement is reduced. For example, in FIG. 2, the average value of the pen tip resistance force with a scanning length of 10 to 40 mm is the sliding value (B). On the other hand, in FIG. 3, the average value of the pen tip resistance force with a scanning length of 15 to 40 mm is the sliding value (B).

  As shown in the above formula (a), the value obtained by subtracting the sliding value (B) from the initial movement value (A) (the difference in pen tip resistance (AB)) is 0 mN or more. The coat film 1 can improve the writing quality of the touch pen with the anti-glare hard coat film itself without providing a cushioning adhesive layer or the like. This is presumably because the relationship between the initial value (A) and the sliding value (B) is 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 movement value (A) is preferably 5 mN or more, more preferably 10 mN or more, and particularly preferably 20 mN or more. . In addition, in the general hard coat film which does not have an unevenness | corrugation on the surface, the initial value (A) specified by a peak top is not shown. Moreover, in a general anti-glare hard coat film, as shown in FIG. 3, although the initial movement value (A) is observed, the nib resistance increases thereafter and the sliding value (B) increases. For this reason, the difference (A−B) in the nib resistance usually shows a negative value.

  If the initial movement value (A) and the sliding value (B) satisfy the above relationship, a touch pen (for example, a polyacetal core touch pen) having a different material and pen tip diameter from the hard felt core touch pen is used. However, the effect of improving the writing quality of the antiglare hard coat film is confirmed.

  On the other hand, if the value obtained by subtracting the sliding value (B) from the initial movement value (A) is too large, the pen tip may be easily worn, and there may be a feeling of being caught at the beginning of writing or a sound may be generated. There is. From this 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. preferable.

  The initial value (A) is preferably 200 to 600 mN, particularly preferably 240 to 500 mN, and more preferably 280 to 450 mN. 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.

  The antiglare hard coat film 1 according to this embodiment has an oleic acid contact angle on the surface of the antiglare hard coat layer 12 of 45 ° or more, preferably 45 ° to 100 °, particularly preferably. It is 48 degrees-70 degrees. The oleic acid contact angle is the tangent of the droplet at the ground contact portion of the hard coat layer surface of the droplet in a state where the droplet of oleic acid is allowed to stand on the surface of the antiglare hard coat layer, Of the angles formed by the surface of the hard coat layer, it refers to the angle on the side containing droplets.

  Since the antiglare hard coat film 1 has an oleic acid contact angle of 45 ° or more, the attached fingerprint is easily wiped off (i.e., excellent in fingerprint wiping property). When the oleic acid contact angle is less than 45 °, the attached fingerprint is difficult to wipe off rapidly. If the attached fingerprint is difficult to wipe off, the appearance of the touch panel will be deteriorated and the display image will be difficult to see. On the other hand, when the oleic acid contact angle exceeds 100 °, the initial value (A) and the sliding value (B) of the nib resistance tend to hardly satisfy the above-described conditions.

2. Antiglare Hard Coat Layer The antiglare hard coat layer 12 of the antiglare hard coat film 1 in the present embodiment relates to the initial movement value (A) and sliding value (B) of the nib resistance and the oleic acid contact angle. As long as the above physical properties are exhibited, it may be formed of any material, but is preferably formed by curing a coating composition C described below. According to the coating composition C, it is easy to form the antiglare hard coat layer 12 satisfying the above physical properties.

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

(1) Polyfunctional (meth) acrylate Coating composition C contains polyfunctional (meth) acrylate as a curable main component. The polyfunctional (meth) acrylate is crosslinked and cured by irradiation with active energy rays. Since the cross-linked density of the polyfunctional (meth) acrylate is high, the antiglare hard coat layer 12 formed by using the polyfunctional (meth) acrylate has a desired hardness and scratch resistance. It will have.

  Examples of the polyfunctional (meth) acrylate include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol di (meth). Acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified di (meth) acrylate phosphate, allylated cyclohexyl di ( (Meth) acrylate, isocyanurate di (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol Li (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylolpropane tri (meth) acrylate, tris (acryloxyethyl) isocyanurate, propionic acid modified dipentaerythritol penta (meth) acrylate, dipentaerythritol Examples include hexa (meth) acrylate and caprolactone-modified dipentaerythritol hexa (meth) acrylate. These may be used individually by 1 type and may be used in combination of 2 or more type.

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

(2) Fine particles The coating composition C contains fine particles having an average particle diameter of 1 to 10 μm. By containing such fine particles, the formed antiglare hard coat layer 12 has a rough surface and exhibits an antiglare function. The average particle size of the fine particles is preferably 2 to 8 μm, and particularly preferably 3 to 5 μm.

Further, the coefficient of variation (CV value) of the particle size represented by the following formula of the fine particles 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 quality of the touch pen becomes better.

  In addition, the average particle diameter and the coefficient of variation (CV value) in this specification are measured using a laser diffraction scattering type particle size distribution measuring apparatus and a 5% by mass dispersion liquid prepared with methyl ethyl ketone as a dispersion medium as a sample. Use a few drops and use the measured value.

  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 made of silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide, and the like. Among these, silica fine particles are preferable. The fine particles may be used alone or in combination of two or more.

  The shape of the fine particles may be a regular shape such as a spherical shape, but is preferably an irregular shape whose shape is not specified. According to the irregular fine particles, it becomes easier to satisfy the relationship between the initial movement value (A) and the sliding value (B) of the pen tip resistance than the spherical fine particles, and the writing quality of the touch pen is better. Become. Accordingly, the fine particles are particularly preferably amorphous silica fine particles.

  The mixing ratio of the fine particles to 100 parts by mass of the polyfunctional (meth) acrylate (or cured product thereof) is preferably 1 to 50 parts by mass, particularly preferably 5 to 30 parts by mass, and more preferably 10 to 10 parts by mass. It is preferably 20 parts by mass. When the mixing ratio of the fine particles is 1 part by mass or more, a desired antiglare property can be imparted to the formed antiglare hard coat layer 12. Further, when the blending ratio of the fine particles is 50 parts by mass or less, the coating property of the coating composition C is improved, and the antiglare hard coat layer 12 having a uniform film thickness can be formed. .

(3) Leveling agent The coating composition C which concerns on this embodiment contains a leveling agent. Thereby, the formed anti-glare hard coat layer 12 has no streak-like defects or unevenness, has a uniform film thickness, and exhibits an excellent appearance.

  Examples of leveling agents include silicone leveling agents, fluorine leveling agents, acrylic leveling agents, vinyl leveling agents, etc. Among them, from the viewpoint of leveling properties and compatibility with other components, fluorine leveling Agents and silicone leveling agents are preferred, and fluorine leveling agents are particularly preferred. In addition, a leveling agent may be used individually by 1 type, and may be used in combination of 2 or more type.

  Preferred examples of the fluorine leveling agent include compounds having a perfluoroalkyl group or a fluorinated alkenyl group in the main chain or side chain. Examples of commercially available products include BYK-340 manufactured by Big Chemie Japan, Footage 650A manufactured by Neos, MegaFac RS-75 manufactured by DIC, V-8FM manufactured by Osaka Organic Chemical Industry, and the like. However, it is not limited to these.

  The silicone leveling agent is preferably polydimethylsiloxane or modified polydimethylsiloxane, and particularly preferably polydimethylsiloxane. If the modification rate of the modified polydimethylsiloxane is high, it is necessary to increase the addition amount in order to exhibit leveling properties and to make the appearance of the obtained antiglare hard coat layer 12 suitable. As a result, the slipperiness of the formed antiglare hard coat layer 12 is increased, and the relationship between the initial movement value (A) and the sliding value (B) of the pen tip resistance force is not satisfied, and the touch pen The writing quality may be degraded.

  The blending ratio of the fluorine leveling agent with respect to 100 parts by mass of the polyfunctional (meth) acrylate (or cured product thereof) is preferably 0.0005 to 10 parts by mass, and particularly preferably 0.001 to 5 parts by mass. More preferably, it is 0.005 to 1 part by mass. When the blending ratio of the leveling agent is within the above range, the leveling effect can be sufficiently obtained while maintaining the touch pen writing quality and the fingerprint wiping property.

(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 antiglare hard coat layer 12 to be formed can be increased, and glare can be suppressed. The average particle size of the silica nanoparticles is preferably 5 to 100 nm, and particularly preferably 10 to 50 nm. In addition, the average particle diameter of a silica nanoparticle shall be measured by the zeta potential measuring method.

  Silica nanoparticles may be modified with an organic substance for the purpose of improving dispersibility. The silica nanoparticles are also preferably in the form of an organosol (colloid). By being in the form of an organosol, the dispersibility of the silica nanoparticles is improved, and the homogeneity and light transmittance of the formed antiglare hard coat layer 12 are improved.

Modification with an organic substance can be performed by a conventional 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 is added to the organosol of silica nanoparticles, heated to about 50 ° C., and stirred for several hours. By doing so, the surface of the silica particles can be modified. The structure and amount of the silane coupling agent to be used are appropriately selected according to the required degree of dispersibility of the silica nanoparticles.

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

  As said silica nanoparticle, what is marketed can be used, It is preferable to use the organosilica sol MEK-ST, MIBK-ST, etc. by Nissan Chemical Co., Ltd. especially.

  The mixing ratio of the silica nanoparticles to 100 parts by mass of the polyfunctional (meth) acrylate (or cured product thereof) is preferably 1 to 50 parts by mass, particularly preferably 2 to 20 parts by mass, and further 2 It is preferable that it is -10 mass parts. The effect mentioned above is exhibited favorably because the compounding ratio of the silica nanoparticles is 1 part by mass or more. 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 formed antiglare hard coat layer 12 can be favorably maintained. .

(5) Other components The coating composition C in this embodiment may contain various additives other than said component. As various additives, for example, photopolymerization initiator, ultraviolet absorber, antioxidant, light stabilizer, antistatic agent, silane coupling agent, anti-aging agent, thermal polymerization inhibitor, colorant, surfactant, Examples include storage stabilizers, plasticizers, lubricants, antifoaming agents, organic fillers, wettability improvers, and coating surface improvers.

  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-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl]- 2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4′-diethylaminobenzof Non, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2 , 4-diethylthioxanthone, benzyldimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoate, and the like. These may be used individually by 1 type and may be used in combination of 2 or more type.

  The blending ratio of the photopolymerization initiator to 100 parts by mass of the polyfunctional (meth) acrylate (or its cured product) is usually selected in the range of 0.2 to 10 parts by mass.

  The antiglare hard coat layer 12 that can satisfy the above-described physical properties can be formed by applying the coating composition C described above to the base film 11 and curing it.

  The thickness of the antiglare hard coat layer 12 is preferably 1 to 15 μm, and particularly preferably 2 to 10 μm. When the thickness of the antiglare hard coat layer 12 is in the above range, the scratch resistance and antiglare performance can be effectively exhibited.

3. Base Film The base film 11 may be appropriately selected from those suitable for touch panels in which a touch pen is used, and a plastic film having good affinity with the antiglare hard coat layer 12 is preferably selected.

  Examples of such plastic films include polyester films such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyolefin films such as polyethylene film and polypropylene film, cellophane, diacetyl cellulose film, triacetyl cellulose 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, polyether sulfone film, poly Etherimide film, fluororesin film Plastic films such as polyamide film, acrylic resin film, polyurethane resin film, norbornene polymer film, cyclic olefin polymer film, cyclic conjugated diene polymer film, vinyl alicyclic hydrocarbon polymer film, or laminates thereof A film is mentioned. Of these, a polyethylene terephthalate film, a polycarbonate film, a norbornene polymer film, and the like are preferable in terms of mechanical strength and the like.

  Moreover, in the said base film 11, in order to improve adhesiveness with the layers (The glare-proof hard coat layer 12, the adhesive layer mentioned later, etc.) provided in the surface, a primer is provided on one side or both sides as desired. Surface treatment can be performed by a treatment, an oxidation method, an uneven 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 examples of the unevenness method include a sand blast method and a solvent treatment method. These surface treatment methods are appropriately selected according to the type of the base film 11, but in general, the corona discharge treatment method is preferably used from the viewpoints of effects and operability.

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

4). Method for Producing Antiglare Hard Coat Film Antiglare hard coat film 1 according to this embodiment contains a coating composition for antiglare hard coat layer 12, preferably coating composition C, and optionally a solvent. The coating liquid to be applied can be applied to the base film 11 and cured to form the antiglare hard coat layer 12.

  The solvent can be used for improving coating properties, adjusting the viscosity, adjusting the solid content concentration, etc., and can be used without particular limitation as long as the polyfunctional (meth) acrylate and the leveling agent can be dissolved. .

  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 cellosorb), ethylene glycol monoethyl ether (ethyl cellosorb), diethylene glycol monobutyl ether (butyl cellosorb), propylene glycol monomethyl ether; aromatic hydrocarbons such as benzene, toluene and xylene; dimethylformamide Amides such as dimethylacetamide and N-methylpyrrolidone.

  Application of the coating liquid of the coating composition may be performed by 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. When the coating composition coating liquid is applied, the coating film is preferably dried at 40 to 120 ° C. for about 30 seconds to 5 minutes.

  Here, when the coating composition contains a leveling agent like the coating composition C, the coating film to which the coating composition is applied has no streak-like defects or unevenness, and therefore the film thickness is uniform. Thus, the antiglare hard coat layer 12 having an excellent appearance can be formed.

When the coating composition is active energy ray curable like the coating composition C, the coating composition is cured by applying active energy rays such as ultraviolet rays and electron beams to the coating film of the coating composition in a nitrogen atmosphere. This is done by irradiation. UV irradiation, high-pressure mercury lamp, a fusion H lamp, can be carried out by a xenon lamp or the like, the dose of ultraviolet ray is illuminance 50~1000mW / cm ^2, about the amount of light 50~1000mJ / cm ² is preferred. On the other hand, the electron beam irradiation can be performed by an electron beam accelerator or the like, and the irradiation amount of the electron beam is preferably about 10 to 1000 krad.

5. Others The antiglare hard coat film 1 according to this embodiment may be any film as long as the antiglare hard coat layer 12 is the outermost surface and has the base film 11 and the antiglare hard coat layer 12. Another layer may be further provided between the conductive hard coat layer 12 and the base film 11 or on the surface of the base film 11 that is not in contact with the antiglare hard coat layer 12. For example, a pressure-sensitive adhesive layer may be formed on the surface of the base film 11 that is not in contact with the antiglare hard coat layer 12, or a release sheet may be laminated on the pressure-sensitive 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 adhesive, and a silicone adhesive, can be used. In addition, this adhesive layer does not need to have cushioning properties as shown in Patent Document 1.

  The arithmetic average surface roughness (Ra) of the antiglare hard coat layer 12 of the antiglare hard coat film 1 according to this embodiment is preferably 0.01 to 10 μm, and particularly 0.1 to 1 μm. It is preferable that it is 0.15-0.5 micrometer. When the arithmetic average surface roughness (Ra) is in the above range, the antiglare hard coat layer 12 exhibits excellent antiglare properties. In addition, arithmetic mean surface roughness (Ra) in this specification is measured by using a contact type roughness meter (in the test example, SV3000S4 manufactured by Mitutoyo Corporation) in accordance with JIS B0601-1994. Suppose that it is obtained from the length curve.

The antiglare hard coat layer 12 of the antiglare hard coat film 1 according to the present embodiment is made of # 0000 steel wool, and the antiglare hard coat layer 12 is 10 cm and 10 reciprocations with a load of 250 g / cm ^2. It is preferable that no rubbing or scratching occurs. By having the scratch resistance based on the evaluation of the steel wool hardness, the antiglare hard coat layer 12 is prevented from being damaged when the antiglare hard coat film 1 is used on the surface of the touch panel. Can do.

  Further, the haze value of the antiglare hard coat film 1 according to the present embodiment is preferably 30% or less, more preferably 20% or less, and particularly preferably 10% or less. When the haze value is 30% or less, high definition can be achieved, which is suitable for a touch panel. Further, from the viewpoint of exhibiting antiglare properties, the haze value is preferably 0.5% or more, more preferably 2% or more, and particularly preferably 6% or more. The haze value is a value measured according to JIS K7136-2000.

  The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

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

  EXAMPLES Hereinafter, although an Example etc. demonstrate this invention further more concretely, the scope of the present invention is not limited to these Examples etc.

[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 (represented in terms of solid content. Hereinafter, the same shall apply to other components). , 4.3 parts by mass of 1-hydroxycyclohexyl phenyl ketone (BASF, Irgacure 184) as a photopolymerization initiator, silica fine particles (Fuji Silysia Chemical Ltd., cyclophobic 702; average particle size 4.1 μm, CV) Value 48%, amorphous) 11 parts by mass, perfluoropolyether-containing acrylate compound as a leveling agent (fluorine leveling agent; manufactured by DIC, Megafac RS-75) 0.710 parts by mass, silica nanoparticles ( 8.3 parts by mass mixed with Nissan Chemical Industries, MIBK-ST, average particle size: 10 nm) To obtain a coating composition. The coating composition was diluted with propylene glycol monomethyl ether to prepare a coating solution having a solid concentration of 30%.

The coating liquid obtained above is applied to the surface of the easy-adhesion layer side of a polyester film with an easy-adhesion layer (Toyobo Co., Ltd., Cosmo Shine A4300, thickness: 125 μm) as a base film using wire bar # 10. , And dried at 70 ° C. for 1 minute. Next, under a nitrogen atmosphere, ultraviolet rays are irradiated under the following conditions by an ultraviolet irradiation device (manufactured by Eye Graphics, Igrantage ECS-401GX type) to form an antiglare hard coat layer having a thickness of 3 μm. A dazzling hard coat film was obtained.
[UV irradiation conditions]
・ Light source: High pressure mercury lamp ・ Lamp power: 2 kW
・ Conveyor speed: 4.23 m / min
Illuminance: 240 mW / cm ²
-Light intensity: 307 mJ / cm ²

[Example 2]
An antiglare 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 antiglare hard coat layer.

Example 3
An antiglare 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 antiglare hard coat layer.

[Comparative Example 1]
Using a polyether-modified polydimethylsiloxane having an acryloyl group as a leveling agent (silicone-based leveling agent; BYK-UV3500, BYK-UV3500), changing its blending amount to 0.710 parts by mass, an antiglare hard coat layer An antiglare hard coat film was produced in the same manner as in Example 1 except that

[Comparative Example 2]
Using a polyether-modified polydimethylsiloxane having an acryloyl group as the leveling agent (silicone leveling agent; BYK-UV3500, manufactured by BYK-Chemie), the blending amount is changed to 0.071 parts by mass, and the antiglare hard coat layer An antiglare hard coat film was produced in the same manner as in Example 1 except that

[Test Example 1] (Measurement of nib resistance)
For the antiglare hard coat layer surface of the antiglare hard coat film produced in the examples and comparative examples, a universal testing machine (Orientec, Tensilon) and a touch pen were used, and the touch pen was applied to the film surface with a load of 150 g. The test was performed under the condition of pressing the pen tip and scanning at a speed of 100 mm / min. And the initial movement value (A) and sliding value (B) of the nib resistance were calculated | required from the obtained measurement chart. Further, a value obtained by subtracting the sliding value (B) from the initial movement value (A) of the pen tip resistance was calculated. As the touch pen, a touch pen having a hard felt core (made by Wacom, ACK-2003, nib diameter 0.5 mm) was used. The results are shown in Table 1.

[Test Example 2] (writing evaluation)
The antiglare hard coat films produced in Examples and Comparative Examples were placed on a glass substrate with the antiglare hard coat layer side facing up. With respect to the antiglare hard coat layer surface of the antiglare hard coat film, the same writing pen as in Test Example 1 and a polyacetal core touch pen (pen tip diameter: 0.4 mm) were used to evaluate the writing quality. In the evaluation, the writing feeling when writing with about 150 g of writing pressure using a pencil (Mitsubishi Pencil Co., Ltd., Mitsubishi Pencil Uni B) on five sheets of paper (Kokuyo S & T Co., Campus Notebook A Rule No-201A). The ones near to were considered good, and those far from the writing taste were judged as bad. The evaluation was performed by three panelists, and all three felt good, and even one felt bad was regarded as 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 antiglare hard coat layer of the antiglare hard coat film produced in the examples and comparative examples was measured using a fully automatic contact angle meter (manufactured by Kyowa Interface Science Co., Ltd., DM-701). The measurement was performed 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.
-Drop volume of oleic acid: 2 μl
・ Measurement time: 3 seconds after dropping ・ Image analysis method: θ / 2 method

[Test Example 4] (Fingerprint wiping evaluation)
A finger was pressed on the surface of the antiglare hard coat layer of the antiglare hard coat film produced in the examples and comparative examples to attach a fingerprint, and this was used as a sample. As samples, three samples were prepared in which three people pressed their fingers once each. Thereafter, a paper waste (Nippon Paper Crecia Co., Ltd., Kimwipe S-200) was used, and the antiglare hard coat layer surface was reciprocated 10 times with a load of about 200 g. As a result, all samples were evaluated as “◯” when the fingerprint was easily wiped off, and “×” when the fingerprint was left uncleaned even in one of the samples. The results are 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 3 wavelength fluorescent lamp was used and the external appearance at the time of reflection and permeation | transmission was evaluated visually. In the evaluation, those having few streak-like defects and unevenness were regarded as good, and those having many streak-like defects and unevenness were regarded as defective. The results are shown in Table 1.

[Test Example 6] (Measurement of haze value)
The haze value (%) of the antiglare hard coat film produced in Examples and Comparative Examples was measured according to JIS K7136-2000 using a haze meter (Nippon Denshoku Industries Co., Ltd., NDH2000). The results are shown in Table 1.

[Test Example 7] (Measurement of surface roughness)
The arithmetic average surface roughness (Ra; μm) of the surface of the antiglare hard coat layer of the antiglare hard coat film produced in Examples and Comparative Examples was measured according to JIS B0601-1994. It was determined from a roughness curve measured using (Mitutoyo, SV3000S4). The results are shown in Table 1.

[Test Example 8] (Evaluation of scratch resistance: steel wool hardness)
The surface of the antiglare hard coat layer of the antiglare hard coat film produced in Examples and Comparative Examples was rubbed with 10 cm and 10 reciprocations at a load of 250 g / cm ² using # 0000 steel wool. The surface of the hard coat layer was evaluated according to the following criteria.
A: No change in appearance before and after the test.
○: No scratch was observed, but the antiglare property was lowered due to the dropping of the particles.
X: A linear wound was seen.

  As is clear from Table 1, the antiglare hard coat films produced in the examples had good writing quality, easy to wipe off the attached fingerprint, and also had good appearance and antiglare properties.

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

DESCRIPTION OF SYMBOLS 1 ... Anti-glare hard coat film 11 ... Base film 12 ... Anti-glare hard coat layer

Claims (5)

An antiglare hard coat film for a touch panel, comprising a base film and an antiglare hard coat layer provided on one surface side of the base film,
The resistance of the nib when the hard felt core touch pen with a nib diameter of 0.5 mm is scanned at a speed of 100 mm / min on the surface of the antiglare hard coat layer at a speed of 100 mm / min. The initial value (A) and the sliding value (B) satisfy the relationship of the following formula (a),
0 ≦ initial movement value (A) −sliding value (B) (a)
An antiglare hard coat film having an oleic acid contact angle on the surface of the antiglare hard coat layer of 45 ° or more. The initial movement value (A) and sliding value (B) of the nib resistance force (mN) satisfy the relationship of the following formula (b): 5 ≦ initial movement value (A) −sliding value (B) ≦ 200 ( b)
The anti-glare hard coat film according to claim 1. The anti-glare hard coat film according to claim 1 or 2, wherein the oleic acid contact angle is 45 ° to 100 °. The antiglare hard coat layer is
Polyfunctional (meth) acrylate,
Fine particles having an average particle diameter of 1 to 10 μm;
The antiglare hard coat film according to any one of claims 1 to 3, wherein a coating composition containing a leveling agent is cured.   The antiglare hard coat film according to claim 4, wherein the fine particles are amorphous silica fine particles.

Images