KR20140141440A - Hard-coated antiglare film - Google Patents

Abstract

Provided is a hard-coated antiglare film that provides an excellent touch pen writing feeling and allows an attached fingerprint to be less visible. The hard-coated antiglare film (1) for a touch panel is provided with a base film (11) and an antiglare hard coating layer (12) that is disposed on one surface of the base film (11). The initial value (A) and the slide value (B) of pen tip resistance (mN) at a time when a hard felt-lead touch pen with a pen tip diameter of 0.5 mm is scanned at a speed of 100 mm per minute under pressurization of 150 g load on a surface of the antiglare hard coating layer (12) satisfy the following formula: (a) 0<=initial value (A)-slide value (B)...(a) and the oleate contact angle of the surface of the antiglare hard coating layer (12) is at least 45°.

Description

[0001] Hard-coated antiglare film [0002]

The present invention relates to a light-shielding hard coating film for a touch panel in which a touch pen is used.

2. Description of the Related Art In recent years, in many electronic apparatuses, a touch panel serving as both a display device and an input means has been widely used. On the surface of the touch panel, a hard coating film having a hard coating layer is usually provided to prevent scratches. In addition, in various displays including a touch panel, light incident from the outside may be reflected to make the display image difficult to see. Therefore, a flash-resistant hard coating film imparting an antiglare function by roughening the surface of the hard coating film is used There is work.

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

In order to solve the problem of the writing feeling, in Patent Document 1, a pressure-sensitive adhesive layer having cushioning property is provided between two substrates, and the touch panel has a predetermined elastic deformability to improve the writing feeling by the touch pen.

Patent Document 1: Japanese Patent No. 2868686

However, in Patent Document 1, it is necessary to provide the pressure-sensitive adhesive layer with cushioning property. Therefore, it is necessary to limit the material used for the pressure-sensitive adhesive layer or make the pressure-sensitive adhesive layer relatively thick. As a result, the manufacturing process becomes troublesome and the manufacturing cost becomes high.

In addition, in the touch panel, even if the input method is a touch pen, fingerprints due to sweat of the finger usually attach to the surface of the touch panel because the user often touches the touch panel. When the fingerprint is attached to the conventional anti-glare hard coating film, the fingerprint is noticeable, so that the appearance is deteriorated and the display image is not easily seen.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a water repellent hard coating film in which the touch feeling of the touch pen is excellent and the adhered fingerprint is hardly visible.

In order to attain the above object, the first aspect of the present invention is a hard-coating film for a touch panel, comprising a base film and a hard-coating layer disposed on one side of the base film, (A) and the contact value (B) of the pen tip resistance (mN) when the touch pen of the hard felt tip having a pen tip diameter of 0.5 mm was injected under a load of 150 g at a speed of 100 mm / (a), and at the same time,

0 &lt; / RTI &gt; &lt; RTI ID = 0.0 &gt; (A) (a)

And a contact angle of oleic acid on the surface of the hard coat layer is 45 DEG or less (Invention 1).

The inventive (inventive) hard-coating film of the present invention is characterized in that the initial value (A) and the contact value (B) of the pen tip resistance (mN) And the contact angle of the oleic acid is 45 DEG or less, so that the attached fingerprints can not be seen easily.

In the above invention (Invention 1), it is preferable that the instantaneous value (A) and the contact value (B) of the pen tip resistance (mN) satisfy the relation of the following formula (b).

5 &lt; RTI ID = 0.0 &gt; (A) &lt; / RTI &gt; (b)

In the invention (Invention 1 or 2), it is preferable that the contact angle of oleic acid is 25 ° to 45 ° (Invention 3).

In the above inventions (Invention 1 to 3), it is preferable that the antiglare hard coat layer is 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 ).

In the above inventions (Invention 1 to 4), it is preferable that the fine particles are amorphous silica fine particles (Invention 5).

The anti-glare hard coating film according to the present invention has good writing feel and hardly shows the attached fingerprint.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a light-scattering hard coat film according to an embodiment of the present invention; FIG.
2 is a graph showing an example of a measurement result of a pen tip resistance force (an example of a non-light-sensitive hard coating film according to the present embodiment);
Fig. 3 is a graph showing another example of measurement result of pen tip resistance (an example of a general anti-glare hard coating film). Fig.

Hereinafter, embodiments of the present invention will be described.

As shown in Fig. 1, the light-shielding hard coat film 1 according to the present embodiment comprises a substrate film 11 and a light-scattering hard coat layer 12 formed on one side of the substrate film 11. As shown in Fig. The anti-glare hard coating film 1 is provided on the surface of the touch panel on which the touch pen is used.

1. Properties

The non-glare hard coating film 1 according to the present embodiment is formed by applying a touch of a hard felt core having a pen tip diameter of 0.5 mm to the surface of the antiglare hard coat layer 12 (the side not contacting the base film 11) (A) and the contact value (B) of the pen tip resistance (mN) when the pen is scanned under a load of 150 g under a pressure of 100 mm / minute satisfy the relation of the following formula (a).

0 &lt; / RTI &gt; &lt; RTI ID = 0.0 &gt; (A) (a)

Here, the initial value (A) of the pen tip resistance is a value of the pen tip resistance shown at the stage when the touch pen starts to scan, and is detected as a normal peak value as shown in Figs. 2 and 3. On the other hand, the contact value (B) of the pen tip resistance force means the average value of the pen tip resistance force in the stable scanning state in which the influence of the initial action is fixed. For example, in FIG. 2, the average value of the pen tip resistance at a scan length of 10 to 40 mm is the contact value B. On the other hand, in FIG. 3, the average value of the pen tip resistance at a scan length of 15 to 40 mm is the contact value (B).

When the value obtained by subtracting the sliding value B from the superposition value A (the difference in pen tip resistance AB) is 0 mN or more as shown in the above formula (a), the hardly water repellent hard coating film 1 is excellent in cushioning The writing feel of the touch pen is improved by the non-light-sensitive hard coating film itself. This is considered to be because the relationship between the initial value (A) and the abutment value (B) is close to the relationship when the pencil is used on the paper. From this point of view, the lower limit value of the value obtained by subtracting the sliding value (B) from the initial value (A) is preferably 5 mN or more, and more preferably 10 mN or more. Moreover, in a general hard coating film having no irregularities on the surface, the superordinate value A indicating the peak top is not observed. 3, the superposition value A is observed. Thereafter, since the pen tip resistance force is increased and the contact value B is increased, the difference in the pen tip resistance force (AB) usually indicates a negative value.

Further, when the initial value A and the contact value B satisfy the above-described relationship, a touch pen (for example, a polyacetal-based touch pen) having a material different from that of the touch pen of the hard felt core , The effect of improving the writing feeling of the light-shielding hard coating 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 is likely to be abraded. From this point of view, the upper limit value of the value obtained by subtracting the sliding value (B) from the initial value (A) is preferably 200 mN or less, more preferably 150 mN or less, and further preferably 100 mN or less.

The initial value (A) is preferably 200 to 600 mN, more preferably 240 to 500 mN, still more preferably 280 to 450 mN. On the other hand, the contact value (B) is preferably 100 to 550 mN, more preferably 150 to 490 mN, and still more preferably 200 to 440 mN.

The hard coat film 1 according to the present embodiment has an oleic acid contact angle of 45 deg. Or less, preferably 25 deg. To 45 deg., And particularly preferably 30 deg. ~ 40 °. The oleic acid contact angle refers to the angle of contact between the surface of the hard coat layer and the tackiness of the droplet at the ground portion of the surface of the hard coat layer of the droplet while the droplet of oleic acid is left standing on the surface of the hard coat layer. Angle refers to.

The repellent hard coating film (1) has an oleic acid contact angle of 45 ° or less so that the attached fingerprints are hard to be seen (excellent in fingerprint non-visibility). If the contact angle of the oleic acid exceeds 45 degrees, the attached fingerprints are likely to appear suddenly, and the appearance of the touch panel is deteriorated and the display image is not easily seen. On the other hand, if the oleic acid contact angle is less than 25, the pen tip of the touch pen tends to be worn or the scratch resistance (hardness of the steel wool) of the surface of the hard coat layer 12 may deteriorate.

2. Anti-static hard coat layer

The hard coat layer 12 of the antiglare hard coat film 1 of the present embodiment exhibits excellent antistatic properties when the above properties are exhibited with respect to the ultrasonic value A, contact value B and oleic acid contact angle of the pen- May be formed of any material, but is preferably formed by curing the coating composition (C) described below. According to the coating composition (C), it is easy to form the light-shielding hard coat layer 12 satisfying the above properties.

The coating composition (C) in the present embodiment contains a polyfunctional (meth) acrylate, fine particles having an average particle diameter of 1 to 10 μm and a leveling agent, and further preferably 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 is true of 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 cured by crosslinking by irradiation of active energy rays. Since the cross-linked polyfunctional (meth) acrylate has a high cross-linking density, the antiglare 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, neopentyl glycol di (meth) acrylate, polyethylene glycol Acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified phosphoric acid (meth) acrylate, hydroxypivalic acid neopentyl glycol di Acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tri , Propionic acid-modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide-modified trimethylol propane tri (meth) (Meth) acrylate, dipentaerythritol hexa (meth) acrylate, caprolactone-modified dipentaerythritol hexa (metha) acrylate, and the like . These may be used singly or in combination of two or more kinds.

The number of functional groups of the polyfunctional (meth) acrylate is preferably 2 to 10, more preferably 3 to 8, in view of the scratch resistance of the antiglare hard coat layer 12 and the transparency due to affinity with the leveling agent .

(2) Fine particles

The coating composition (C) contains fine particles having an average particle diameter of 1 to 10 mu m. The anti-glare hard coat layer 12 formed by containing such fine particles has a roughened surface and exhibits an anti-glare function. The average particle size of the fine particles is preferably 2 to 8 탆, more preferably 3 to 5 탆.

The coefficient of variation (CV value) of the particle size represented by the following formula of the fine particles is preferably 10 to 70%, more preferably 20 to 60%.

Variation coefficient of particle size (CV value) = (standard deviation diameter / average particle diameter) x 100

When the CV value of the fine particles is in the above-mentioned range, the writing feeling of the touch pen becomes better.

In the present specification, the coefficient of variation (CV value) of the average particle size and the particle diameter is determined by using a laser diffraction scattering particle size distribution measuring apparatus and using a dispersion of 5 mass% concentration prepared by methyl ethyl ketone as a dispersion as a sample .

The fine particles may be inorganic fine particles or organic fine particles, but from the viewpoint of the hardness of the formed anti-glare hard coat layer 12, inorganic fine particles are preferable. Examples of the inorganic fine particles include fine particles composed 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. The fine particles may be used singly or in combination of two or more.

The shape of the fine particles may be a spherical shape or the like, but a morphology in which the shape is not specified is preferable. The irregular fine particles can easily satisfy the relationship between the initial value A and the contact value B of the pen tip resistance force as compared with the spherical fine particles, so that the touch feeling of the touch pen becomes better. Therefore, it is particularly preferable that the fine particles are amorphous silica fine particles.

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

(3) leveling agents

The coating composition (C) according to the present embodiment contains a leveling agent. Thereby, the anti-glare hard coat layer 12 to be formed exhibits a uniform appearance without any defects such as streaks or unevenness, and exhibits excellent appearance.

Examples of the leveling agent include silicone leveling agents, fluorine leveling agents, acrylic leveling agents, and vinyl leveling agents. Of these, silicone leveling agents and fluorine-based leveling agents are preferred from the viewpoint of leveling property and compatibility with other components. Leveling agents are preferred. The leveling agent may be used singly or in combination of two or more kinds.

The silicone leveling agent is preferably a polydimethylsiloxane or a modified polydimethylsiloxane, and it is particularly preferably a polydimethylsiloxane. Further, when the modifying ratio of the modified polydimethylsiloxane is high, the leveling property is exhibited and the appearance of the obtained antiglare hard coat layer 12 is made very suitable, so that it is necessary to increase the addition amount. As a result, the slidability of the anti-glare hard coat layer 12 to be formed becomes high, the relationship between the initial value A of the pen tip resistance force and the contact value B is not satisfied, and the writing feel of the touch pen is lowered There is a case.

As the fluorine leveling agent, a compound having a perfluoroalkyl group or fluorinated alkenyl group in the main chain or side chain is preferable. Examples of commercially available products include BYK-340 manufactured by Big Chem Japan Co., Plutel Gent 650 A manufactured by NEOS, Mega Park RS-75 manufactured by DIC, and V-8 FM manufactured by Osaka Organic Chemical Industries, .

The blending ratio of the silicone leveling agent to 100 parts by mass of the polyfunctional (meth) acrylate (or the cured product thereof) is preferably 0.001 to 1.0 part by mass, more preferably 0.005 to 0.8 part by mass, more preferably 0.01 to 0.1 part by mass More preferable. On the other hand, in the case of the fluorine leveling agent, it is preferably 0.1 to 10 parts by mass, particularly preferably 0.5 to 5 parts by mass, more preferably 0.8 to 3 parts by mass, per 100 parts by mass of the polyfunctional (meth) acrylate Is more preferable. When the compounding ratio of the leveling agent is in the above range, the leveling effect can be sufficiently obtained while satisfactorily maintaining the writing feel and the fingerprint non-visibility of the touch pen.

(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 becomes high, and flashing can be suppressed. The average particle diameter of the silica nanoparticles is preferably 5 to 100 nm, more preferably 10 to 50 nm. Furthermore, the average particle diameter of the silica nanoparticles is measured by the zeta potential measurement method.

The silica nanoparticles may be modified by an organic material for the purpose of improving the dispersibility or the like. It is also preferable that the silica nanoparticles are in the form of an organosol (colloidal form). In the form of organosol, the dispersibility of the silica nanoparticles becomes good, and the homogeneity and light transmittance of the formed anti-scattering hard coat layer 12 are improved.

The modification with an organic substance can be carried out according to a conventional method. For _{example, CH 2 = C (CH 3} ) COO (CH 2) 3 Si (OCH 3) the addition of the silane coupling agent of the structure, such as ₃ in the organosol of silica nanoparticles, and the mixture was stirred allowed to warm to several hours, so 50 ℃ , The surface of the silica particles can be modified. The structure and amount of the silane coupling agent used are appropriately selected according to the required degree of dispersion of the silica nanoparticles.

As the dispersion solvent for the organosol, methyl ethyl ketone, methyl isobutyl ketone and the like which are excellent in compatibility with the polyfunctional (meth) acrylate and the leveling agent and excellent in the volatility during the formation of the coating layer are preferable.

As the above-mentioned silica nanoparticles, those commercially available can be used. Among them, organosilica sol MEK-ST and MIBK-ST manufactured by Nissan Kagaku Co., Ltd. are preferably used.

The mixing ratio of the silica nanoparticles to 100 parts by mass of the polyfunctional (meth) acrylate (or the cured product thereof) is preferably 1 to 50 parts by mass, more preferably 2 to 20 parts by mass, more preferably 2 to 10 parts by mass Is more preferable. When the mixing ratio of the above-mentioned silica nanoparticles is 1 part by mass or more, the above-mentioned effect is excellently exerted. 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 is suppressed, and the homogeneity and light transmittance of the formed anti-glare hard coat layer 12 can be maintained well.

(5) Other components

The coating composition (C) in the present embodiment may contain various additives in addition to the above components. Examples of the various additives include additives such as 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, Fillers, wettability improvers, drawing improvement agents, and the like.

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-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-morpholinopropane-1-one, 4- (2-hydroxyethoxy) phenyl- , Benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methyl anthraquinone, 2-ethyl anthraquinone, 2- , 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethylketal, acetophenone dimethylketal, p-dimethylamino benzoate There may be mentioned acid ester and the like. These may be used singly or in combination of two or more kinds.

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

By coating the above-described coating composition (C) on the base film (11) and curing the coating, the hard coat layer (12) capable of satisfying the above-mentioned physical properties can be formed.

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

3. Base film

The base film 11 may be suitably selected from those suitable for use with a touch panel in which a touch pen is used, and preferably a plastic film having good affinity with the non-light-sensitive hard coating layer 12 is selected.

Examples of the plastic film include a polyester film such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, a polyolefin film such as a polyethylene film and a polypropylene film, a cellophane film, a diacetylcellulose film, a triacetylcellulose film A polyvinyl chloride film, a polyvinyl alcohol film, an ethylene-vinyl acetate copolymer film, a polystyrene film, a polycarbonate film, a polymethylpentene film, a polysulfone film, a polyether Based polymer film, a cyclic olefin-based polymer film, a cyclic conjugated diene-based polymer film, a polyetherimide film, a fluorine resin film, a polyamide film, an acrylic resin film, a polyurethane resin film, a norbornene polymer film, Vinyl alicyclic hydrocarbon There may be mentioned a plastic film or their laminated films, such as polymer film. Among them, a polyethylene terephthalate film, a polycarbonate film, a norbornene polymer film and the like are preferable from the viewpoint of mechanical strength and the like.

The base film 11 may be subjected to a primer treatment (for example, a heat treatment, a heat treatment, or the like) on one surface or both surfaces as desired for the purpose of improving adhesion with a layer , An oxidation method, an irregularization method, or the like. Examples of the oxidation method include a corona discharge treatment, a chromic acid treatment, a flame treatment, a hot air treatment, and an ozone / ultraviolet ray treatment. Examples of the surface irregularity method include a sand blast method and a solvent treatment method. These surface treatment methods are appropriately selected depending on the kind of the base film 11, but generally, corona discharge treatment methods are preferably used from the viewpoints of effects and operability.

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

4. Manufacturing method of flash-resistant hard coating film

The antiglare hard coat film 1 according to the present embodiment is formed by coating a coating composition for a light-shielding hard coat layer 12, preferably a coating composition (C) and a coating liquid containing a solvent, ), And curing them to form the antiglare hard coat layer 12.

The solvent can be used for improving the coating properties, adjusting the viscosity, adjusting the solid concentration, and the like, and can be used without particular limitation, provided that 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; Ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; Esters such as ethyl acetate, butyl acetate, ethyl lactate and? -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; And amides such as dimethylformamide, dimethylacetamide and N-methylpyrrolidone.

The application of the coating liquid of the coating composition may be carried out according to a conventional method, and may be carried out in accordance with, 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. It is preferable to dry the coating film at 40 to 120 DEG C for 30 seconds to 5 minutes after applying the coating solution of the coating composition.

Here, when the coating composition contains a leveling agent as in the case of the coating composition (C), the coating film coated with the coating composition has no stripe-like defects or unevenness, and therefore, the film thickness is uniform, The hard coat layer 12 can be formed.

In the case where the coating composition has an active energy ray curability like the coating composition (C), the curing of the coating composition is carried out by irradiating the coating film of the coating composition with active energy rays such as ultraviolet rays and electron beams under a nitrogen atmosphere. The ultraviolet ray irradiation can be performed by a high-pressure mercury lamp, a fusion H lamp, a xenon lamp, etc., and the irradiation amount of ultraviolet rays is preferably about 50 to 1000 mW / cm ² and 50 to 1,000 mJ / cm ² . On the other hand, the electron beam irradiation can be performed by an electron beam accelerator or the like, and the dose of the electron beam is preferably about 10 to 1000 krad.

5. Other

The hard coat film 1 according to the present embodiment is not limited as long as the hard coat layer 12 has the outermost surface and has the substrate film 11 and the hard coat layer 12, 12 and the base film 11 or on the side of the base film 11 on which the light-shielding hard coat layer 12 is not in contact. For example, a pressure-sensitive adhesive layer may be formed on the side 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.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited, and known pressure-sensitive adhesives such as an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive adhesive, and a silicone pressure-sensitive adhesive can be used. Furthermore, the pressure-sensitive adhesive layer need not have the cushioning property as shown in Patent Document 1. [

The arithmetic mean surface roughness (Ra) of the hard coat layer 12 of the light-shielding hard coat film 1 according to the present embodiment is preferably 0.01 to 10 탆, more preferably 0.1 to 1 탆, more preferably 0.15 More preferably from 0.5 to 0.5 mu m. When the arithmetic mean surface roughness (Ra) is in the above range, the anti-glare hard coat layer 12 exhibits excellent anti-glare properties. Further, the arithmetic average surface roughness (Ra) in the present specification shall be determined from the roughness curve measured using a contact type roughness meter (SV3000S4 manufactured by Mitsutoyo Co., Ltd. is used in the test example) in accordance with JIS B0601-1994.

The non-light-sensitive hard coat layer 12 of the non-light-fast hard coat film 1 according to the present embodiment was formed by using a steel wool of # 0000 and having a thickness of 10 cm at a load of 250 g / cm &lt; ² & 10 It is preferable not to scratch the roundwire. By having the scratch resistance by the evaluation of the steel wool hardness, it is possible to suppress the occurrence of scratches on the anti-glare hard coat layer 12 when the anti-glare hard coating film 1 is used on the surface of the touch panel.

The haze value of the hard coat film 1 according to the present embodiment is preferably 30% or less, more preferably 20% or less, and particularly preferably 15% or less. When the haze value is 30% or less, high definition can be achieved, which is very suitable for a touch panel. Further, from the standpoint of exhibiting the antifogging property, 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 in accordance with JIS K7136-2000.

The embodiments described above are provided for the purpose of facilitating understanding of the present invention and are 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 antireflective hard coat layer 12 in the antireflective hard coat film 1.

Example

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

[Example 1]

100 parts by mass (equivalent to other components, hereinafter) of dipentaerythritol hexaacrylate (NK Ester A-DPH, manufactured by Shin-Nakamura Kagaku Kogyo Co., Ltd.) as polyfunctional (meth) acrylate, , 4.3 parts by mass of 1-hydroxycyclohexyl phenyl ketone (manufactured by BASF, IGACA CURE 184) as a photopolymerization initiator, and silica fine particles (Cyprofobics 702 manufactured by Fuji Silysia Kagaku Co., Ltd., average particle size 4.1 mu m, CV value 48% , 0.01 part by mass of polydimethylsiloxane (SH28 manufactured by Toray Dow Corning Co., Ltd.) as a leveling agent, and 8.3 parts by mass of silica nanoparticles (MIBK-ST, average particle size: 10 nm, manufactured by Nissan Kagaku Kogyo Co., Ltd.) To obtain a coating composition. The coating composition was diluted with propylene glycol monomethyl ether to prepare a coating liquid having a solid content concentration of 30%.

The coating solution obtained above was coated on the side of the simple adhesive layer side of the polyester film with a simple adhesive layer as a base film (Toyobo Co., Cosmo Shine A4300, thickness: 125 탆) with a wire bar # 10, Lt; / RTI &gt; Subsequently, ultraviolet rays were irradiated under a nitrogen atmosphere under the following conditions by an ultraviolet ray irradiation apparatus (manufactured by Eyegraphics, Inc., ECG-401 GX type) to form a light-scattering hard coat layer having a thickness of 3 m, A hard coating film was obtained.

[UV irradiation condition]

· Light source: High pressure mercury lamp

· Lamp power: 2kW

· Conveyor speed: 4.23m / min

Roughness: 240 mW / cm ²

Light quantity: 307 mJ / cm ²

[Example 2]

The hard coat film was prepared in the same manner as in Example 1, except that the blending amount of the leveling agent was changed to 0.14 parts by mass to form a hard-coatable hard coat layer.

[Example 3]

A hard coat film was prepared in the same manner as in Example 1, except that the blending amount of the leveling agent was changed to 0.70 parts by mass to form a hard-coatable hard coat layer.

[Example 4]

A hard coat layer was formed in the same manner as in Example 1, except that an ultraviolet-reactive fluorine oligomer (Productogent 650A, manufactured by Neos Co., Ltd.) was used as a leveling agent and the blending amount was changed to 1.4 parts by mass to form a flash- .

[Comparative Example 1]

Except that a polyether-modified polydimethylsiloxane having an acryloyl group as a leveling agent (BYK-UV3500, manufactured by Big Chemie) was used and the blending amount was changed to 1.4 parts by mass to form a flash-resistant hard coat layer. To produce a flash-resistant hard coat film.

[Comparative Example 2]

The hard coat film was prepared in the same manner as in Example 1, except that the blending amount of the leveling agent was changed to 1.4 parts by mass to form a hard-coatable hard coat layer.

[Comparative Example 3]

The silica fine particles of Example 1 were changed to fine silica particles (MX-300, manufactured by Soweki Kagaku Co., Ltd., average particle size 3.0 탆, CV value 15%, spherical shape), the blending amount thereof was changed to 10 parts by mass, Was changed from # 10 to # 14 to change the film thickness of the anti-glare hard coat layer to 5 mu m, to thereby produce a light-scattering hard coat film.

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

(Tensilon made by ORIENTEC Co., Ltd., Tensilon) and a touch pen were used for the surface of the hard coat layer of the flash-resistant hard coat film produced in Examples and Comparative Examples, To perform scanning at a speed of 100 mm / min. From the obtained measurement chart, the initial value (A) and the contact value (B) of the pen tip resistance were obtained. The value obtained by subtracting the sliding value (B) from the initial value (A) of the pen tip resistance was calculated. As the touch pen, a touch pen of a hard felt seam (ACK-2003 manufactured by Wacom, pen tip diameter 0.5 mm) was used as the pen tip. The results are shown in Table 1.

[Test Example 2] (Evaluation of writing feeling)

The non-light-sensitive hard coating films prepared in Examples and Comparative Examples were placed on a glass substrate with the non-light-sensitive hard coating layer side up. The touch feeling of each of the touch pens and polyacetal seam touch pens (pen tip diameter: 0.4 mm) as in Test Example 1 was evaluated on the surface of the light-scattering hard coat layer of the repellent hard coat film. In the evaluation, a writing feeling when writing with a pencil (Mitsubishi Enfitt Co., Mitsubishi Enfidz Uni B) in writing paper of five sheets (Kokuyo S & T Co., Campus notebook A ruling no-201A) And that the distance from the writing feel was determined to be defective. Furthermore, evaluation was done by three panelists, and all three people were good that we felt good, and one person felt bad that it was bad. The results are shown in Table 1.

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

Diffusibility of the Difficult-to-Hard Coat Film Prepared in Examples and Comparative Examples The contact angle of oleic acid on the hard coat layer surface was measured using an electromagnetic-type contact angle meter (DM-701, manufactured by Kyowa Kaimenkakakusha) under the following conditions. As the oleic acid, oleic acid manufactured by Tokyo Kasei Kogyo Co., Ltd. was used. The results are shown in Table 1.

· Droplet volume of oleic acid: 2 μl

· Measurement time: 3 seconds after dropping

· Image analysis method: θ / 2 method

[Test Example 4] (Fingerprint invisibility evaluation)

The haze value (%) of the light-shielding hard coat film before and after pressing the finger was measured with a haze meter (manufactured by Denso Kogyo Co., Ltd., Japan) NDH2000), according to JIS K7136-2000. Then, a value obtained by subtracting the haze value of the film before pressing the finger (haze value difference) from the haze value of the film after pressing the finger was obtained, and evaluation was made based on the following criteria. In addition, the haze value of the evaluation object is an average value when three samples each of the samples each of which the finger is pressed are measured. The results are shown in Table 1. Table 1 also shows the haze value of the light-shielding hard coat film before the finger was pressed.

?: Haze value difference less than 0.5

Good: The difference in haze value between 0.5 and 1.0

X: Haze value difference exceeded 1.0

[Test Example 5] (Evaluation of Appearance)

With respect to the light-scattering hard coating films prepared in Examples and Comparative Examples, the appearance at the time of reflection and transmission was visually evaluated using a three-wavelength fluorescent lamp. In the evaluation, it was determined that the striped defects and unevenness were small and the striped defects and unevenness were many. The results are shown in Table 1.

[Test 6] (Measurement of surface roughness)

The arithmetic mean surface roughness (Ra; unit: 탆) of the surface of the hard coat layer was measured with a contact type roughness meter (SV3000S4 manufactured by Mitsutoyo Co., Ltd.) in accordance with JIS B0601-1994 And the light intensity was measured using the illuminance curve. The results are shown in Table 1.

[Test Example 7] (evaluation of scratch resistance: steel wool hardness)

The surface of the hard coat layer of the present invention and the comparative example was coated with a water repellent hard coat layer with a # 0000 steel wool at a load of 250 g / cm &lt; ² &gt; Was evaluated on the basis of the following criteria.

◎: No change at all before and after test.

○: No scratches were observed, but the scattering properties were deteriorated due to the drop of the particles.

X: Linear wound was observed.

Pen tip resistance (mN) Written texture
Exterior
Haze value (%)
Fingerprint
Non-visibility
Oleic acid
Contact angle (°)
Ra
(탆)
Scratch resistance Super equivalent
(A) Abutment
(B) A-B hard
felt
core Poly
Acetal core Example 1 412 338 74 Good Good Good 9.7 ◎ 32.0 0.24 ◎ Example
2 397 323 74 Good Good Good 9.4 ○ 41.6 0.23 ◎ Example
3 294 279 15 Good Good Good 10.2 ○ 44.7 0.26 ◎ Example
4 382 323 59 Good Good Good 7.6 ◎ 21.3 0.25 ○ Comparative Example
One 265 323 -58 Bad Bad Good 8.4 × 48.6 0.26 ◎ Comparative Example
2 250 294 -44 Bad Bad Good 9.1 × 46.2 0.26 ◎ Comparative Example
3 235 279 -44 Bad Bad Good 12.1 ○ 26.6 0.24 ×

As is clear from Table 1, the non-light-sensitive hard coating film produced in the examples had good writing feel, poor adhesion to the fingerprint, and excellent appearance and anti-glare properties.

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… Diffusible hard coating film
11 ... Base film
12 ... Diffusible hard coat layer

Claims (5)

A retardation film for a touch panel, comprising: a base film; and a light-scattering hard coat layer provided on one side of the base film,
(A) of the pen tip resistance (mN) when a touch pen of a hard felt tip having a pen tip diameter of 0.5 mm was applied to the surface of the above-mentioned diaphragm-resistant hard coating layer under a pressure of 150 g under a load of 100 mm / The sliding value B satisfies the relation of the following formula (a)
0 &lt; / RTI &gt;&lt; RTI ID = 0.0 &gt; (A) (a)
Wherein the angle of contact of oleic acid on the surface of the hard coat layer is 45 DEG or less. The method according to claim 1,
Wherein the initial value (A) and the contact value (B) of the pen tip resistance (mN) satisfy the relationship of the following formula (b).
5 &lt; RTI ID = 0.0 &gt; (A) &lt; / RTI &gt; (b) The method according to claim 1,
Wherein the oleic acid contact angle is in the range of 25 DEG to 45 DEG. The method according to claim 1,
The anti-glare hard coating layer
Polyfunctional (meth) acrylate,
Fine particles having an average particle diameter of 1 to 10 mu m,
Leveling agent
&Lt; / RTI &gt; wherein the coating composition is cured. 5. The method of claim 4,
Wherein the fine particles are amorphous silica fine particles.

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