JP7067900B2 - Coat film - Google Patents

Description

The present invention relates to a coated film that can be used in a display.

As the display is used, various stains may adhere to the surface of the display. If the surface of the display becomes dirty, the appearance will be poor and the displayed contents will be difficult to see. Therefore, as a film to be attached to the surface of a display or a film constituting the surface layer of a display, a coated film having a performance of suppressing the adhesion of stains and a performance of easily wiping off the adhered stains has been developed. ..

In Patent Document 1, as an example of such a coated film, a transparent substrate, a hard coat layer, and an antireflection layer made of a curable resin composition containing a predetermined fluorine compound are laminated in this order for reflection. Anti-reflective films are disclosed. One of the problems of the antireflection film of Patent Document 1 is that it has excellent antifouling property. In the antireflection film, the antireflection layer is formed by using a curable resin composition containing a predetermined fluorine compound, thereby achieving excellent antifouling property.

Japanese Unexamined Patent Publication No. 2004-294601

In the embodiment of Patent Document 1, a line is drawn on the surface of the antireflection film on the antireflection layer side with an oil-based pen, and the antifouling property is evaluated based on whether or not the line can be easily wiped off. Here, as the oil-based pen, an oil-based pen including an ink in which a dye is dissolved in a volatile solvent is used. Therefore, the line written on the antireflection film is composed of a dye remaining after the volatile solvent is volatilized from the ink, and in the embodiment of Patent Document 1, whether or not the dye can be wiped off. It will be tested.

On the other hand, since the surface of the display is often touched by a finger, finger oil generated from the finger is more likely to adhere to the surface than the dye as described above. In particular, when the display is a touch panel, such finger oil will adhere very frequently. However, the antireflection film disclosed in Patent Document 1 has not been able to easily wipe off finger oil.

The present invention has been made in view of such an actual situation, and an object of the present invention is to provide a coat film in which adhered finger oil can be easily wiped off.

In order to achieve the above object, first, the present invention is a coat film including a base film and a coat layer provided on one surface side of the base film, wherein the coat layer is the same. Provided is a coated film characterized in that the oleic acid sliding angle on the surface opposite to the base film is 32 ° or less (Invention 1).

In the coat film according to the above invention (Invention 1), the oleic acid sliding angle on the surface of the coat layer opposite to that of the base film is within the above range, so that finger oil does not easily fit on the surface, and the surface thereof. The finger oil adhering to the surface can be easily wiped off.

In the above invention (Invention 1), the total haze value of the coated film is preferably 3% or more and 60% or less (Invention 2).

In the above inventions (Inventions 1 and 2), it is preferable that the coat layer is formed by curing a coating composition containing fine particles (Invention 3).

In the above invention (Invention 3), it is preferable that the average particle size of the fine particles is 0.5 μm or more and 8 μm or less (Invention 4).

In the above inventions (Inventions 3 and 4), it is preferable that the fine particles are organic fine particles (Invention 5).

In the above inventions (Inventions 3 to 5), the coating composition contains nanoparticles having an average particle size of 5 nm or more and 100 nm or less and a refractive index of 1.6 or more and 3.0 or less together with the fine particles. (Invention 6).

In the above inventions (Inventions 1 to 6), the coat layer is located distal to the base film and the first coat layer located proximal to the base film, and the first coat layer is located distal to the base film. It is preferable to include a second coat layer having a refractive index lower than that of the coat layer (Invention 7).

The coated film according to the present invention is easy to wipe off the adhered finger oil.

It is sectional drawing of the coated film which concerns on 1st Embodiment of this invention. It is sectional drawing of the coated film which concerns on 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 discloses a coat film 1 according to the first embodiment. The coat film 1 is composed of a base film 30 and a coat layer 10 formed on one surface of the base film 30.

Further, FIG. 2 discloses the coat film 2 according to the second embodiment. The coat film 2 includes a base film 30 and a coat layer 20 formed on one surface of the base film 30. Further, the coat layer 20 is located proximal to the base film 30 and distal to the base film 30, and has a higher refractive index than the first coat layer 21. Includes a low second coat layer 22.

1. 1. Physical properties In the coat films 1 and 2 according to the present embodiment, the oleic acid sliding angle on the surface of the coat layers 10 and 20 opposite to the base film 30 is 32 ° or less, preferably 28 ° or less. In particular, it is preferably 25 ° or less. When the oleic acid sliding angle is 32 ° or less, even if a finger touches the surface and finger oil adheres to the surface, the finger oil does not easily fit on the surface, and the finger oil is wiped off from the surface. It will be easy. On the other hand, when the oleic acid sliding angle exceeds 32 °, it becomes difficult to wipe off the adhered finger oil rapidly. If it is difficult to wipe off the finger grease adhered in this way, the appearance of the display using the coated film will be deteriorated and the displayed image will be difficult to see.

The finger fat contains various components having different properties such as water, fatty acid, protein, amino acid, and salt. Therefore, wiping off the finger oil is very difficult as compared with the case of wiping off the dye derived from the oil-based pen as tested in Patent Document 1 described above. However, according to the coat films 1 and 2 according to the present embodiment, as described above, the adhered finger oil can be easily wiped off. Further, according to the coat films 1 and 2 according to the present embodiment, not only finger oil but also dyes and pigments derived from oil-based pens can be easily wiped off.

The lower limit of the above-mentioned oleic acid sliding angle is not particularly limited, and is, for example, preferably more than 0 °, particularly preferably 5 ° or more, and further preferably 10 ° or more.

Here, the above-mentioned oleic acid sliding angle means that the coat films 1 and 2 according to the present embodiment are flat and flat so that the surface of the coat layers 10 and 20 opposite to the base film 30 faces up. After placing it on a horizontal table, let the droplets of oleic acid stand on the surface, and then gradually tilt the table so that the surface and the horizontal plane when the droplets start to slide down. The smaller angle of the angles formed by the oleic acid. The specific method for measuring the oleic acid sliding angle is as shown in a test example described later.

Further, in the coat films 1 and 2 according to the present embodiment, the oleic acid contact angle on the surface of the coat layers 10 and 20 opposite to the base film 30 is preferably 60 ° or more, particularly 65 ° or more. It is preferable that the temperature is 68 ° or higher. The oleic acid contact angle is preferably 120 ° or less, particularly preferably 100 ° or less, and further preferably 80 ° or less. When the oleic acid contact angle is in the above range, the oleic acid sliding angle is likely to satisfy the above range. The method for measuring the oleic acid contact angle is as shown in a test example described later.

The coat films 1 and 2 according to the present embodiment preferably have a total haze value of 3% or more, particularly preferably 4% or more, and further preferably 5% or more. The total haze value is preferably 60% or less, more preferably 45% or less, particularly preferably 34% or less, and further preferably 23% or less. When the total haze value is 3% or more, it is possible to effectively suppress the occurrence of glare on the display screen when the coated films 1 and 2 are used for the display. Further, when the total haze value is 60% or less, the visibility of the display can be improved when the coated films 1 and 2 are used for the display. The method for measuring the total haze value is as described in a test example described later.

In the coat films 1 and 2 according to the present embodiment, the reflectance on the surface of the coat layers 10 and 20 opposite to the base film 30 is preferably 10% or less, and particularly preferably 6% or less. It is preferable, more preferably 4% or less. When the reflectance is 10% or less, it is possible to reduce the reflection of external light in the display in which the coated films 1 and 2 are used. It should be noted that such a low reflectance can be more easily achieved in the coat film 2 provided with the second coat layer 22 having a lower refractive index than the first coat layer 21. The lower limit of the reflectance is not particularly limited, and is preferably 0% or more, and particularly preferably 1% or more. The method for measuring the reflectance is as shown in a test example described later.

2. 2. Each member (1) Coat layer of the coat film according to the first embodiment The coat layer 10 of the coat film 1 according to the first embodiment is formed of any material as long as the oleic acid sliding angle is within the above-mentioned range. You may. From the viewpoint of easily achieving the above-mentioned oleic acid sliding angle, the coat layer 10 comprises a curable component, fine particles (excluding nanoparticles described later and fine particles for adjusting the refractive index), and optionally predetermined nanoparticles. It is preferable to form the coating composition C1 containing the above by curing it.

(1-1) Curable component The curable component is a component that is cured by a trigger such as an active energy ray or heat, and examples thereof include an active energy ray curable component and a thermosetting component. In the present embodiment, it is preferable to use an active energy ray-curable component from the viewpoint of the hardness of the formed coat layer 10 and the heat resistance of the base film 30.

As the active energy ray-curable component, one that is cured by irradiation with active energy rays to exhibit a predetermined hardness and can achieve the above-mentioned physical properties in relation to fine particles is preferable.

Specific examples of the active energy ray-curable component include a polyfunctional (meth) acrylate-based monomer, a (meth) acrylate-based prepolymer, an active energy ray-curable polymer, and the like, and among them, a polyfunctional (meth) acrylate. It is preferably a based monomer and / or a (meth) acrylate-based prepolymer, and more preferably a polyfunctional (meth) acrylate-based monomer. The polyfunctional (meth) acrylate-based monomer and the (meth) acrylate-based prepolymer may be used alone or in combination of both. In addition, in this specification, (meth) acrylate means both acrylate and methacrylate. The same applies to other similar terms.

Examples of the polyfunctional (meth) acrylate-based monomer include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol di. (Meta) acrylate, neopentyl glycol di (meth) acrylate hydroxypivalate, dicyclopentanyldi (meth) acrylate, caprolactone-modified dicyclopentenyldi (meth) acrylate, ethylene oxide-modified di (meth) acrylate, allylation Cyclohexyldi (meth) acrylate, isocyanurate di (meth) acrylate, trimethylolpropantri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid-modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate ) Acrylate, propylene oxide modified trimethylol propantri (meth) acrylate, tris (acryloxyethyl) isocyanurate, pentaerythritol tetra (meth) acrylate, propionic acid-modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) ) Polyfunctional (meth) acrylates such as acrylates, ethylene oxide-modified dipentaerythritol hexa (meth) acrylates, and caprolactone-modified dipentaerythritol hexa (meth) acrylates can be mentioned. These may be used individually by 1 type, or may be used in combination of 2 or more type.

On the other hand, examples of the (meth) acrylate-based prepolymer include polyester acrylate-based, epoxy acrylate-based, urethane acrylate-based, and polyol acrylate-based prepolymers.

As the polyester acrylate-based prepolymer, for example, the hydroxyl group of the polyester oligomer having hydroxyl groups at both ends obtained by the condensation of the polyvalent carboxylic acid and the polyhydric alcohol is esterified with (meth) acrylic acid, or the polyvalent value is obtained. It can be obtained by esterifying the hydroxyl group at the end of the oligomer obtained by adding an alkylene oxide to a carboxylic acid with a (meth) acrylic acid.

The epoxy acrylate-based prepolymer can be obtained, for example, by reacting (meth) acrylic acid with the oxylan ring of a bisphenol type epoxy resin or a novolak type epoxy resin having a relatively low molecular weight to esterify.

The urethane acrylate-based prepolymer can be obtained, for example, by esterifying a polyurethane oligomer obtained by a reaction between a polyether polyol or a polyester polyol and a polyisocyanate with (meth) acrylic acid.

The polyol acrylate-based prepolymer can be obtained, for example, by esterifying the hydroxyl group of the polyether polyol with (meth) acrylic acid.

The above prepolymers may be used alone or in combination of two or more.

It is also preferable to use an organic-inorganic hybrid resin as the active energy ray-curable component. As the organic-inorganic hybrid resin, a substance formed by binding an organic compound having a polymerizable unsaturated group to inorganic fine particles such as silica via a silane coupling agent or the like is preferably mentioned. The inorganic fine particles contained in the organic-inorganic hybrid resin do not correspond to the fine particles and nanoparticles described later, but have a function as a binder, and can improve the hardness of the formed coat layer 10.

(1-2) Fine Particles The fine particles may be organic fine particles or inorganic fine particles as long as the above-mentioned oleic acid sliding angle can be achieved. From the viewpoint of easily achieving the above-mentioned oleic acid sliding angle, it is preferable to use organic fine particles.

Examples of the organic fine particles include fine particles made of acrylic resin, polystyrene resin, polyethylene resin, epoxy resin, polyacrylonitrile resin and the like. Among these, as the organic fine particles, fine particles made of an acrylic resin are preferable. Examples of the acrylic resin include homopolymers of methyl methacrylate and copolymers of methyl methacrylate with monomers such as vinyl acetate, styrene, methyl acrylate, and ethyl (meth) acrylate. Can be mentioned.

Examples of the inorganic fine particles include fine particles made of alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide and the like.

The fine particles described above may be used alone or in combination of two or more.

The coating composition C1 for forming the coat layer 10 preferably does not contain amorphous silica fine particles. Since the coating composition C1 does not contain amorphous silica fine particles, it becomes easy to use the coating composition C1 to form the coat layer 10 that achieves the above-mentioned oleic acid sliding angle.

The shape of the fine particles may be a fixed shape such as a spherical shape or an irregular shape whose shape is not specified as long as the above-mentioned oleic acid sliding angle can be achieved. However, from the viewpoint of easily achieving the above-mentioned oleic acid sliding angle, the shape of the fine particles is preferably spherical, and particularly preferably true spherical.

The average particle size of the fine particles is preferably 0.5 μm or more, particularly preferably 0.8 μm or more, and further preferably 1 μm or more. The average particle size is preferably 8 μm or less, particularly preferably 6 μm or less, and further preferably 3 μm or less. When the average particle size of the fine particles is in the above-mentioned range, the coat film 1 can easily achieve the above-mentioned oleic acid sliding angle. In addition, the following formula (1) of the fine particles
Coefficient of variation of particle size (CV value) = (standard deviation particle size / average particle size) × 100 ... (1)
The coefficient of variation (CV value) of the particle size indicated by is preferably 10 to 80%, particularly preferably 20 to 60%. When the CV value of the fine particles is in the above range, the coat film 1 can more easily achieve the above-mentioned oleic acid sliding angle. For the average particle size and the coefficient of variation (CV value) of the fine particles in the present specification, a dispersion having a concentration of 5% by mass prepared with methyl ethyl ketone as a dispersion medium using a laser diffraction scattering type particle size distribution measuring device is used. Use as a sample and use the measured value.

The content of the fine particles in the coating composition C1 is preferably 1 part by mass or more, particularly preferably 3 parts by mass or more, and further 5 parts by mass or more with respect to 100 parts by mass of the curable component. It is preferable to have. The content of the fine particles is preferably 60 parts by mass or less, particularly preferably 55 parts by mass or less, and further preferably 50 parts by mass or less with respect to 100 parts by mass of the curable component. preferable. When the content of the fine particles is 1 part by mass or more, the coat film 1 can easily achieve the above-mentioned oleic acid sliding angle. Further, when the content of the fine particles is 60 parts by mass or less, the coatability of the coating composition C1 is improved, and it becomes easy to form the coat layer 10 having a uniform film thickness.

(1-3) Nanoparticles The coating composition C1 may contain nanoparticles having an average particle size smaller than that of the fine particles, in addition to the above-mentioned fine particles. By forming the coat layer 10 using the coating composition C1 containing the nanoparticles, it becomes easy to form the coat film 1 having the above-mentioned total haze value. In particular, since the nanoparticles are present between the fine particles, the internal haze can be increased while suppressing the increase of the external haze, which makes it easy to adjust the total haze value.

The average particle size of the nanoparticles is preferably 100 nm or less, particularly preferably 70 nm or less, and further preferably 50 nm or less. When the average particle size of the nanoparticles is 100 nm or less, the nanoparticles are sufficiently smaller than the above-mentioned fine particles, and the nanoparticles can be effectively filled in the coat layer 10. Although the lower limit of the average particle size of the nanoparticles is not particularly limited, for example, it is preferably 5 nm or more, particularly preferably 10 nm or more, and further preferably 15 nm or more. In addition, the following formula (1) of the nanoparticles
Coefficient of variation of particle size (CV value) = (standard deviation particle size / average particle size) × 100 ... (1)
The coefficient of variation (CV value) of the particle size indicated by 1 is preferably 1 to 100%, and particularly preferably 5 to 80%. When the CV value of the fine particles is in the above range, the coat film 1 can more easily achieve the above-mentioned oleic acid sliding angle. The average particle size of the nanoparticles and the coefficient of variation (CV value) of the particle size in the present specification are determined by a dynamic light scattering method.

The refractive index of the nanoparticles is preferably 1.6 or more, particularly preferably 1.7 or more, and further preferably 1.8 or more. The refractive index of the nanoparticles is preferably 3.0 or less, particularly preferably 2.8 or less, and further preferably 2.7 or less. When the refractive index of the nanoparticles is in the above range, the internal haze in the coat layer 10 can be easily adjusted to a desired range, and the coat film 1 having the above-mentioned total haze value can be more easily formed.

The nanoparticles are not particularly limited as long as they have a smaller average particle size than the above-mentioned fine particles, but for example, zirconium oxide particles, tin oxide particles, titanium oxide particles, zinc oxide particles, aluminum oxide particles, and antimony oxide. Examples include metal oxide particles such as particles, gold particles, and silver particles. These particles may be used alone or in combination of two or more. Among these, it is preferable to use zirconium oxide particles or titanium oxide particles.

The content of the nanoparticles in the coating composition C1 is preferably 1 part by mass or more, particularly preferably 2 parts by mass or more, and further 3 parts by mass with respect to 100 parts by mass of the curable component. The above is preferable. The content of the nanoparticles is preferably 60 parts by mass or less, particularly preferably 50 parts by mass or less, and further preferably 40 parts by mass or less with respect to 100 parts by mass of the curable component. Is preferable. When the content of the nanoparticles is in the above range, it becomes easy to adjust the total haze value of the coat film 1 to the above range.

(1-4) Other Components The coating composition C1 in the present embodiment may contain various additives in addition to the above components. Examples of various additives include dispersants, surface modifiers, leveling agents, photopolymerization initiators, ultraviolet absorbers, antioxidants, light stabilizers, antistatic agents, silane coupling agents, antiaging agents, and thermal polymerization. Examples thereof include prohibitive agents, colorants, surfactants, storage stabilizers, plasticizers, lubricants, defoamers, organic fillers, wettability improvers, and coating surface improvers.

In particular, the coating composition C1 preferably contains a photopolymerization initiator from the viewpoint of efficiently advancing the cross-linking reaction of the curable component by irradiation with active energy rays. 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, and 2,2-dimethoxy-2-phenylacetophenone. 2,2-Diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenylketone, 2-methyl-1- [4- (methylthio) phenyl]- 2-Morphorino-Propane-1-one, 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2- Methylanthraquinone, 2-ethylanthraquinone, 2-tershari-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyl Examples thereof include dimethyl ketal, acetphenone dimethyl ketal, p-dimethylaminobenzoic acid ester and the like. These may be used individually by 1 type, or may be used in combination of 2 or more type.

Further, the coating composition C1 preferably contains a dispersant from the viewpoint of improving the dispersibility of the fine particles and nanoparticles described above. Examples of the dispersant include a carboxy group, a hydroxyl group, a sulfo group, a primary amino group, a secondary amino group, a tertiary amino group, an amide group, a quaternary ammonium base, a pyridium base, a sulfonium base and a phosphonium base in the molecule. A compound having one or more polar groups selected from the group consisting of is preferable, and a compound having one or more polar groups of a carboxy group and a hydroxyl group is particularly preferable. One of the above polar groups may be introduced into the molecule, or a plurality of the above polar groups may be introduced. When the compound as a dispersant has a plurality of polar groups, the basic skeleton of the compound is preferably composed of an ester chain, a vinyl chain, an acrylic chain, an ether chain, a urethane chain and the like. Specifically, acrylic resin, urethane resin, polyester resin and alkyd resin are preferable, acrylic resin, urethane resin and polyester resin are particularly preferable, and acrylic resin is further preferable. The polar groups may be randomly arranged in the molecule, but are preferably arranged in the side chain. Therefore, the compound as a dispersant is preferably an acrylic resin having a carboxy group and / or a hydroxyl group in the side chain. The dispersant may be used alone or in combination of two or more.

Further, the coating composition C1 preferably contains a surface adjusting agent from the viewpoint that there are no streaky defects or unevenness and it is easy to form the coat layer 10 having a uniform film thickness. Examples of the surface adjusting agent include silicone-based surface adjusting agents, fluorine-based surface adjusting agents, acrylic-based surface adjusting agents, vinyl-based surface adjusting agents, and the like, and among them, from the viewpoint of leveling property and compatibility with other components. Therefore, a silicone-based surface conditioner is preferable. The silicone-based surface conditioner is preferably polydimethylsiloxane or modified polydimethylsiloxane, and particularly preferably polydimethylsiloxane. The surface conditioner may be used alone or in combination of two or more.

(1-5) Physical Properties of Coat Layer The refractive index of the coat layer 10 is usually 1.4 or more, preferably 1.45 or more, and particularly preferably 1.5 or more. The refractive index is usually 1.8 or less, preferably 1.7 or less, and particularly preferably 1.6 or less. When the refractive index of the coat layer 10 is in the above range, the above-mentioned preferable reflectance value can be easily achieved in the coat film 1.

The thickness of the coat layer 10 is preferably 1 μm or more, particularly preferably 2 μm or more, and further preferably 3 μm or more. The thickness of the coat layer 10 is preferably 30 μm or less, more preferably 20 μm or less, particularly preferably 8 μm or less, and further preferably 6 μm or less. When the thickness of the coat layer 10 is 1 μm or more, the coat layer 10 tends to have a desired hardness, and the above-mentioned oleic acid sliding angle is easily achieved, so that the coat film 1 has good finger oil wiping property. Will be easy to demonstrate. Further, when the thickness of the coat layer 10 is 30 μm or less, the handleability of the coat film 1 becomes more excellent.

(2) First coat layer of the coat film according to the second embodiment The coat film 2 in the second embodiment includes the first coat layer 21 and the second coat layer 22 to provide the above-mentioned olein. Achieves an oleic acid slip angle and has excellent finger oil wiping properties. The first coat layer 21 may be formed of any material as long as the oleic acid sliding angle on the surface of the coat layer 20 opposite to the base film 30 is within the above-mentioned range. From the viewpoint of easily achieving the above-mentioned oleic acid sliding angle, the first coat layer 21 cures the above-mentioned coating composition C1 in the same manner as the coat layer 10 of the coat film 1 in the first embodiment. It is preferable to form by.

The curable component, fine particles, nanoparticles, and other components contained in the coating composition C1 for forming the first coat layer 21 are each contained in the coating composition C1 for forming the coat layer 10. The above-mentioned ones can be used as each component to be added. Further, the content of each of the fine particles and the nanoparticles in the coating composition C1 can also be the above-mentioned content for the coating composition C1 for forming the coat layer 10.

In the coat film 2 according to the present embodiment, the refractive index of the first coat layer 21 is usually 1.4 or more, preferably 1.45 or more, and particularly preferably 1.5 or more. The refractive index is usually 1.8 or less, preferably 1.7 or less, and particularly preferably 1.6 or less. When the refractive index of the first coat layer 21 is in the above range, the above-mentioned preferable reflectance value can be easily achieved in the coat film 2.

Further, in the coat film 2 according to the second embodiment, the thickness of the first coat layer 21 is preferably 1 μm or more, particularly preferably 2 μm or more, and further preferably 3 μm or more. preferable. The thickness of the first coat layer 21 is preferably 30 μm or less, more preferably 20 μm or less, particularly preferably 8 μm or less, and further preferably 6 μm or less. When the thickness of the first coat layer 21 is 1 μm or more, the first coat layer 21 tends to have a desired hardness, and the above-mentioned oleic acid sliding angle is easily achieved, so that the coat film 2 can be formed. It becomes easy to exhibit good finger oil wiping property. Further, when the thickness of the first coat layer 21 is 30 μm or less, the handleability of the coat film 2 becomes more excellent.

(3) Second coat layer of the coat film according to the second embodiment The coat film 2 according to the second embodiment has a higher refractive index than the first coat layer 21 and the second coat layer 22. By providing the small second coat layer 22, the reflection of external light can be effectively reduced in the display in which the coat film 2 is used. In the second coat layer 22, the oleic acid sliding angle on the surface of the coat layer 20 is in the above-mentioned range, and the refractive index of the second coat layer 22 is smaller than the refractive index of the first coat layer 21. It may be formed from any material as long as it is possible. In particular, the second coat layer 22 is easy to achieve the above-mentioned oleic acid sliding angle and the refractive index of the second coat layer 22 is smaller than the refractive index of the first coat layer 21. , It is preferable to form the coating composition C2 containing an active energy ray-curable compound and, if desired, fine particles for adjusting the refractive index.

(3-1) Active Energy Ray Curable Compound Examples of the active energy ray curable compound include a photopolymerizable prepolymer and a photopolymerizable monomer.

The photopolymerizable prepolymer includes a radical polymerization type and a cationic polymerization type, and examples of the radical polymerization type photopolymerizable prepolymer include polyester acrylate-based, epoxy acrylate-based, urethane acrylate-based, and polyol acrylate-based. Can be mentioned.

As the polyester acrylate-based prepolymer, for example, the hydroxyl group of a polyester oligomer having hydroxyl groups at both ends obtained by condensation of a polyvalent carboxylic acid and a polyhydric alcohol is esterified with (meth) acrylic acid, or the polyvalent value is obtained. It may be obtained by esterifying the hydroxyl group at the terminal of the oligomer obtained by adding an alkylene oxide to a carboxylic acid with (meth) acrylic acid.

The epoxy acrylate-based prepolymer may be obtained, for example, by reacting (meth) acrylic acid with an oxylan ring of a relatively low molecular weight bisphenol type epoxy resin or a novolak type epoxy resin to esterify it.

The urethane acrylate-based prepolymer may be obtained, for example, by esterifying a polyurethane oligomer obtained by reacting a polyether polyol or a polyester polyol with a polyisocyanate with (meth) acrylic acid.

The polyol acrylate-based prepolymer may be obtained by esterifying the hydroxyl group of the polyether polyol with (meth) acrylic acid.

On the other hand, it is preferable to use an epoxy resin as the cationically polymerizable photopolymerizable prepolymer. Examples of the epoxy resin include compounds obtained by epoxidizing polyhydric phenols such as bisphenol resin and novolak resin with epichlorohydrin and the like, and compounds obtained by oxidizing linear olefin compounds and cyclic olefin compounds with peroxides and the like. And so on.

Examples of the photopolymerizable monomer include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol di (meth) acrylate. , Neopentyl glycol adipate 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 Meta) acrylate, allylated cyclohexyldi (meth) acrylate, isocyanurate di (meth) acrylate, trimethylolpropanetri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid-modified dipentaerythritol tri (meth) acrylate , Pentaerythritol tri (meth) acrylate, propylene oxide-modified trimethylolpropanthry (meth) acrylate, tris (acryloxyethyl) isocyanurate, propionic acid-modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate , Polyfunctional (meth) acrylates such as caprolactone-modified dipentaerythritol hexa (meth) acrylates.

The active energy ray-curable compound described above may be used alone or in combination of two or more.

(3-2) Fine Particles for Refractive Index Adjustment Since the coating composition C2 contains fine particles for adjusting the refractive index, the coating composition C2 is used to form a second coat layer 22 having a desired refractive index. It will be easy. The fine particles for adjusting the refractive index are not limited as long as they can form the second coat layer 22 having a desired refractive index, but from the viewpoint that the second coat layer 22 having a desired refractive index can be easily formed. , Silica sol, porous silica fine particles, hollow silica fine particles and the like are preferably used.

As the silica sol, colloidal silica obtained by suspending silica fine particles in an alcohol-based or cellosolve-based organic solvent in a colloidal state can be preferably used. Here, the average particle size of the silica fine particles is preferably 5 nm or more, and particularly preferably 10 nm or more. The average particle size is preferably 200 nm or less, and particularly preferably 100 nm or less. Further, the following formula (1) of the silica fine particles
Coefficient of variation of particle size (CV value) = (standard deviation particle size / average particle size) × 100 ... (1)
The coefficient of variation (CV value) of the particle size indicated by is preferably 10 to 70%, and particularly preferably 20 to 60%. When the CV value of the fine particles is in the above range, the coat film 1 can more easily achieve the above-mentioned oleic acid sliding angle. The average particle size of the silica fine particles and the coefficient of variation (CV value) of the particle size are determined by a dynamic light scattering method.

The hollow silica fine particles and the porous silica fine particles have fine voids in the fine particles in an open state or a closed state. Since these fine particles are filled with a gas (for example, air having a refractive index of 1) in the voids, the refractive index of the fine particles is relatively low. Therefore, by using these fine particles, the refractive index of the second coat layer 22 can be effectively lowered without impairing the transparency of the second coat layer 22.

The average particle size of the hollow silica fine particles and the porous silica fine particles is preferably 5 nm or more, and particularly preferably 10 nm or more. The average particle size of the hollow silica fine particles and the porous silica fine particles is preferably 300 nm or less, particularly preferably 200 nm or less, and further preferably 100 nm or less. Further, the following formula (1) of the silica fine particles
Coefficient of variation of particle size (CV value) = (standard deviation particle size / average particle size) × 100 ... (1)
The coefficient of variation (CV value) of the particle size indicated by 1 is preferably 1 to 100%, and particularly preferably 5 to 80%. When the CV value of the fine particles is in the above range, the coat film 1 can more easily achieve the above-mentioned oleic acid sliding angle. The average particle size and the coefficient of variation (CV value) of the average particle size and the particle size of the hollow silica fine particles and the porous silica fine particles are determined by a dynamic light scattering method. Further, the average pore diameter of the voids of the hollow silica fine particles and the porous silica fine particles is preferably 10 nm or more and 100 nm or less. The hollow silica fine particles and the porous silica fine particles may have closed cells, open cells, or both closed cells and open cells.

The content of the fine particles for adjusting the refractive index in the coating composition C2 is preferably 2 parts by mass or more, and particularly preferably 5 parts by mass or more, based on 100 parts by mass of the active energy ray-curable compound. Further, it is preferably 10 parts by mass or more. The content is preferably 150 parts by mass or less, particularly preferably 125 parts by mass or less, and further 100 parts by mass or less with respect to 100 parts by mass of the active energy ray-curable compound. Is preferable. When the content of the fine particles for adjusting the refractive index is in the above range, it becomes easy to form the second coat layer 22 having a desired refractive index.

(3-3) Other Components The coating composition C2 may contain an additive such as a photopolymerization initiator in addition to the above components. As the photopolymerization initiator, the above-mentioned photopolymerization initiator may be used as the photopolymerization initiator which may be contained in the coating composition C1 for forming the coat layer 10 in the coat film 1 according to the first embodiment. can.

(3-4) Physical Properties of the Second Coat Layer, etc. In the coat film 2 according to the present embodiment, the refractive index of the second coat layer 22 is preferably 1.2 or more, particularly 1.25 or more. It is preferably present, and more preferably 1.3 or more. Further, the refractive index is preferably 1.6 or less, particularly preferably 1.5 or less, and further preferably 1.45 or less. When the refractive index of the second coat layer 22 is in the above range, it becomes clear that the refractive index is smaller than that of the first coat layer 21, and the reflection of external light is effective in the display in which the coat film 2 is used. Can be reduced.

Further, in the coat film 2 according to the second embodiment, the thickness of the second coat layer 22 is preferably 0.03 μm or more, particularly preferably 0.05 μm or more, and further 0. It is preferably 1 μm or more. The thickness of the second coat layer 22 is preferably 1 μm or less, particularly preferably 0.75 μm or less, and further preferably 0.5 μm or less. When the thickness of the second coat layer 22 is within the above range, the reflection of external light can be effectively reduced in the display in which the coat film 2 is used.

(4) Base film The base film 30 is not particularly limited, but it is preferable to use a resin film having predetermined transparency. Examples of such a resin film include polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyolefin films such as polyethylene films and polypropylene films, cellophane, diacetyl cellulose films, triacetyl cellulose films, and acetyl cellulose butyrate. Film, Polyvinyl Chloride Film, Vinylidene Chloride Film, Polyvinyl Alcohol Film, Ethylene-Vinyl Acetate Copolymer Film, Polystyrene Film, Polycarbonate Film, Polymethylpentene Film, Polysulphon Film, Polyether Ether Ketone Film, Polyether Sulphon Film , Polyetherimide film, fluororesin film, polyamide film, acrylic resin film, polyurethane resin film, norbornene polymer film, cyclic olefin polymer film, cyclic conjugated diene polymer film, vinyl alicyclic hydrocarbon polymer Examples thereof include a resin film such as a film or a laminated film thereof. Among them, polyethylene terephthalate film, polycarbonate film, triacetyl cellulose film, norbornene-based polymer film and the like are preferable from the viewpoint of mechanical strength and the like.

Further, in the base film 30, one side or both sides may be desired for the purpose of improving the adhesion to the layer provided on the surface thereof (coat layer 10, first coat layer 21, adhesive layer described later, etc.). Can be surface-treated by a primer treatment, an oxidation method, an unevenness method, or the like. Examples of the oxidation method include corona discharge treatment, chromic acid treatment, flame treatment, hot air treatment, ozone / ultraviolet treatment, and the like, and examples of the unevenness method include sandblasting method, solvent treatment method, and the like. These surface treatment methods are appropriately selected depending on the type of the base film 30, but in general, the corona discharge treatment method is preferably used from the viewpoints of the effect of improving adhesion and operability.

The thickness of the base film 30 is preferably 15 μm or more, and particularly preferably 30 μm or more. The thickness of the base film 30 is preferably 300 μm or less, and particularly preferably 200 μm or less.

(5) Other Structures The coat films 1 and 2 according to the present embodiment may be provided with an adhesive layer on the surface side of the base film 30 opposite to the coat layers 10 and 20. The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited, and known pressure-sensitive adhesives such as acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives can be used, and a pressure-sensitive adhesive having predetermined transparency. It is preferable to use.

When the coat films 1 and 2 according to the present embodiment include the above-mentioned pressure-sensitive adhesive layer, the coat films 1 and 2 according to the present embodiment are on the opposite side of the base film 30 in the pressure-sensitive adhesive layer. A release sheet may be laminated on the surface. The release sheet is not particularly limited as long as it has a desired release property on the release surface (the surface in contact with the pressure-sensitive adhesive layer), and a known release such as one in which one side of a resin film is peeled with a release agent is known. Film can be used.

3. 3. Method for Producing Coat Film The method for producing the coat film 1 according to the first embodiment is not particularly limited, and for example, a coating liquid containing the above-mentioned coating composition C1 and, if desired, a solvent is applied to the base film 30. It can be produced by applying it to the coating layer and curing it to form the coat layer 10.

The solvent can be used for improving the coatability, adjusting the viscosity, adjusting the solid content concentration, and the like, and can be used without particular limitation as long as it dissolves the curable component and the like.

Specific examples of the solvent include alcohols such as methanol, ethanol, isopropanol, butanol and octanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; ethyl acetate, butyl acetate, ethyl lactate and γ-butyrolactone. Esters; Ethers such as ethylene glycol monomethyl ether (methyl cellosolve), ethylene glycol monoethyl ether (ethyl cellosorb), diethylene glycol monobutyl ether (butyl cellosorb), propylene glycol monomethyl ether; aromatic hydrocarbons such as benzene, toluene, xylene; dimethyl Examples thereof include amides such as formamide, dimethylacetamide, and N-methylpyrrolidone.

The coating liquid of the coating composition C1 may be applied 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. After applying the coating liquid of the coating composition, it is preferable to dry the coating film at 40 to 120 ° C. for about 30 seconds to 5 minutes.

When the coating composition is active energy ray curable as in the coating composition C1, the curing of the coating composition is performed by applying active energy rays such as ultraviolet rays and electron beams to the coating film of the coating composition under a nitrogen atmosphere. It is done by irradiating. The ultraviolet irradiation can be performed by a high-pressure mercury lamp, a fusion H lamp, a xenon lamp, or the like, and the ultraviolet irradiation amount is preferably about 50 to 1000 mW / cm ² in illuminance and 50 to 1000 mJ / cm ² in light amount. 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 grad.

The method for producing the coat film 2 according to the second embodiment is not particularly limited, but for example, after the first coat layer 21 is formed on one side of the base film 30, the base film in the first coat layer 21 is formed. It is preferable to form the second coat layer 22 on the surface side opposite to 30. In this case, similarly to the coat layer 10 described above, after the first coat layer 21 is formed on the base film 30, the surface of the first coat layer 21 opposite to the base film 30 is subjected to. For example, the second coat layer 22 is formed by applying and curing a coating liquid containing the above-mentioned coating composition C2 and, if desired, a solvent.

As the solvent for preparing the coating liquid of the coating composition C2, the above-mentioned solvent can be used as the solvent for preparing the coating liquid of the coating composition C1. Further, the method of applying the coating liquid of the coating composition C2 and the method of curing the obtained coating film can be the same as the coating method and the curing method according to the coating composition C1, respectively.

4. How to use the coated film The coated films 1 and 2 according to the present embodiment can be used for a display. In particular, the coat films 1 and 2 can be attached to the surface of the display. In this case, the coat films 1 and 2 are provided with the above-mentioned pressure-sensitive adhesive layer, and it is preferable that the surface of the pressure-sensitive adhesive layer opposite to the base film 30 is attached to the surface of the display. Further, the coat films 1 and 2 can be used as the surface layer of the display. In this case, the coat films 1 and 2 are incorporated into the display so that the surface on the coat layers 10 and 20 side is the surface of the display.

In the coat films 1 and 2 according to the present embodiment, the oleic acid sliding angle on the surface of the coat layers 10 and 20 opposite to the base film 30 is within the above-mentioned range, so that finger oil does not easily fit on the surface. It becomes easy to wipe off the finger oil adhering to the surface. As a result, it is possible to prevent the appearance of the display from being deteriorated by finger oil, and it is possible to achieve excellent visibility.

Further, since the coat films 1 and 2 according to the present embodiment can achieve excellent wiping property of finger oil as described above, the coat films 1 and 2 are used for a touch panel that is very often touched by a finger. It is preferable to do so. The touch panel may be a touch panel mainly premised on being operated with a finger, or may be a touch panel mainly premised on being operated with a stylus. The touch panel method is not particularly limited, and may be, for example, a capacitance method, a pressure sensitive type, an electromagnetic induction type, an ultrasonic method, a resistance film method, or the like.

The embodiments described above are described for facilitating the 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 30 and the coat layer 10 in the coat film 1, and the base film 30 and the first coat layer 21 in the coat film 2 may be interposed. Another layer may be interposed between the first coat layer 21 and the second coat layer 22.

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

[Example 1]
(1) Preparation of coating composition C1 Product name as a curable component "Opstar Z7530" (manufactured by Arakawa Chemical Industry Co., Ltd., organic-inorganic hybrid resin) 100 parts by mass (solid content conversion value; the same applies hereinafter) and a product as fine particles 12 parts by mass of the name "Techpolymer XX-27LA" (manufactured by Sekisui Kasei Kogyo Co., Ltd., acrylic fine particles, average particle size 1.5 μm, shape: spherical) and the product name "Floren G700" (manufactured by Kyoei Co., Ltd.) as a dispersant. The first coat layer is formed by mixing 0.2 parts by mass and 0.15 parts by mass of the product name "FS-7025" (manufactured by Fluoro Technology) as a surface conditioner in propylene glycol monomethyl ether. A coating liquid of the coating composition C1 having a solid content of 40% by mass for forming was prepared.

(2) Preparation of coating composition C2 Product name as an active energy ray-curable compound "Beamset 575CB" (manufactured by Arakawa Chemical Industry Co., Ltd., polyfunctional acrylate-based UV / EB curable resin) 100 parts by mass and refractive index adjustment Product name "Thruria 4320" (manufactured by JGC Catalysts and Chemicals, hollow silica fine particles, average particle size: 60 nm) 75 parts by mass and product name "OMNIRAD 907" (manufactured by BASF) 3 as a photopolymerization initiator. By mixing 10 parts by mass and 10 parts by mass of the product name "FS-7025" (manufactured by Fluorotechnology) as a surface conditioner in a mixed solvent of methyl ethyl ketone and cyclohexanone (mixing ratio 1: 1), A coating solution of the coating composition C2 having a solid content of 5% by mass for forming the coat layer of 2 was prepared.

(3) Formation of First Coat Layer A coating composition obtained in the above step (1) on one side of a triacetyl cellulose film (manufactured by TACBRIGHT, product name "TACPHANP980RP", thickness: 80 μm) as a base film. The coating liquid of the product C1 was applied and dried at 70 ° C. for 1 minute.

Next, under a nitrogen atmosphere, an ultraviolet irradiation device (manufactured by Eye Graphics Co., Ltd., product name "Eigrantage ECS-401GX type") was irradiated with ultraviolet rays under the following conditions to form a first coat layer. As a result, a laminate composed of a base film and a first coat layer having a thickness of 3.5 μm was obtained.
[Ultraviolet irradiation conditions]
・ Light source: High-voltage mercury lamp ・ Lamp power: 2kW
・ Conveyor speed: 4.23m / min
・ Illuminance: 240mW / cm ²
・ Light intensity: 307mJ / cm ²

(4) Formation of Second Coat Layer The coating composition C2 obtained in the above step (2) is applied onto the surface of the laminate obtained in the above step (3) on the side of the first coat layer. The liquid was applied and dried at 70 ° C. for 1 minute.

Next, under a nitrogen atmosphere, an ultraviolet irradiation device (manufactured by Eye Graphics Co., Ltd., product name "Eigrantage ECS-401GX type") was used to irradiate ultraviolet rays under the same ultraviolet irradiation conditions as in the above step (3) to obtain a thickness of 100 nm. A second coat layer was formed. As a result, a coat film obtained by laminating the base film, the first coat layer, and the second coat layer in this order was obtained.

[Examples 2 to 9, Comparative Examples 1 to 3]
A coat film was produced in the same manner as in Example 1 except that the composition of the coating composition C1 was changed as shown in Table 1.

[Example 10]
A coating composition C1 obtained in the same manner as in the step (1) of Example 1 is applied to one side of a triacetyl cellulose film (manufactured by TACBRIGHT, product name "TACPHANP980RP", thickness: 80 μm) as a base film. The working solution was applied and dried at 70 ° C. for 1 minute.

Next, under a nitrogen atmosphere, an ultraviolet irradiation device (manufactured by Eye Graphics Co., Ltd., product name "Eigrantage ECS-401GX type") is used to irradiate ultraviolet rays under the same ultraviolet irradiation conditions as in the step (3) of Example 1 to increase the thickness. A coating layer having a thickness of 3.5 μm was formed. As a result, a coat film composed of a base film and a single coat layer was obtained.

[Examples 11 to 14, Comparative Examples 4 to 6]
A coat film was produced in the same manner as in Example 10 except that the composition of the coating composition C1 was changed as shown in Table 1.

The details of the abbreviations and the like shown in Table 1 are as follows.
Curable component A1: Product name "Opstar Z7530" (manufactured by Arakawa Chemical Industry Co., Ltd., organic-inorganic hybrid resin)
Curable component A2: Product name "HCA-150D clear" (manufactured by Tokushiki)
Fine particles: Product name "Techpolymer XX-27LA" (manufactured by Sekisui Plastics Co., Ltd., average particle size 1.5 μm, shape: spherical)
Nanoparticles: Product name "NANON5 ZR-020" (manufactured by Solar, zirconium oxide particles, average particle size 10 to 20 nm, refractive index about 1.9, shape: spherical)
Dispersant: Product name "Floren G700" (manufactured by Kyoeisha)
Surface conditioner: Product name "FS-7025" (manufactured by Fluoro Technology)
Amorphous silica fine particles: Product name "HCA-150H" (manufactured by Tokushiki Co., Ltd., hardener containing amorphous silica fine particles (average particle size 1.5 μm), compounding ratio of hardener and amorphous silica fine particles is 7: 1 )

[Test Example 1] (Measurement of refractive index)
A polyethylene terephthalate film having an easily adhesive layer on one side of each of the coating liquid of the coating composition C1, the coating liquid of the coating composition C2, and the coating liquid of the coating composition C1'prepared in Examples and Comparative Examples. (Manufactured by Toyobo Co., Ltd., product name "Cosmo Shine A4100", thickness: 50 μm) was applied to the surface opposite to the easy-adhesive layer to form each coat layer under the same conditions as in Examples and Comparative Examples. ..

The refractive index of each of the obtained coated layers was measured using a spectroscopic ellipsometer (manufactured by JA WOOLLAM, product name "M-2000") under the conditions of a measurement wavelength of 589 nm and a measurement temperature of 23 ° C. The results are shown in Table 2.

[Test Example 2] (Measurement of haze value)
The haze value (%) of the coated film produced in Examples and Comparative Examples was measured using a haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name “NDH5000”), and this was measured as the total haze value (%) of the coated film. ). The results are shown in Table 2.

Further, one of the release films was peeled off from the optical transparent adhesive (manufactured by Lintec Corporation, product name "OPTERIA MO-T015"), and the exposed surface of the exposed optical transparent adhesive was a coated film produced in Examples and Comparative Examples. It was attached to the surface on the coat layer side in 1 and used as a measurement sample. The haze value (%) of the measurement sample was measured using a haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name “NDH5000”), and this was taken as the internal haze value (%) of the coated film. The results are shown in Table 2.

Further, the external haze value (%) of the coated film was calculated by subtracting the internal haze value (%) from the total haze value (%). The results are shown in Table 2.

Further, with respect to the coat films according to Examples 1 to 9 and Comparative Examples 1 to 3 including the first coat layer and the second coat layer, a laminate (coat film) of the first coat layer and the base film is used. The state before forming the second coat layer, which is obtained in the middle of the production of the above, was produced under the same conditions as in these Examples and Comparative Examples, and the total haze value (%) in the laminated body, the inside. The haze value (%) and the external haze value (%) were measured in the same manner as above. These results are also shown in Table 2.

[Test Example 3] (Measurement of contact angle and sliding angle)
The surface of the coat film produced in Examples and Comparative Examples on the base film side was attached to one side of the glass plate. After that, the glass plate was placed on a test stand of a contact angle meter (manufactured by KYOWA, product name "DH350 test stand") so that the surface to which the coated film was attached faced up.

Subsequently, 2 μL of water was dropped on the surface of the coat film on the coat layer side, and the contact angle (°) immediately after the drop was measured with the contact angle meter, and this was defined as the water contact angle (°). The results are shown in Table 2.

Further, after dropping 7 μL of water on the surface of the coat film on the coat layer side, the test table is tilted by 1 °, and the angle at which the water droplets start to slide is measured by the contact angle meter. This was defined as the water sliding angle (°). The results are shown in Table 2.

Further, 2 μL of oleic acid was dropped onto the surface of the coat film on the coat layer side, and the contact angle (°) immediately after the drop was measured with the contact angle meter, and this was taken as the oleic acid contact angle (°). The results are shown in Table 2.

Further, after dropping 7 μL of oleic acid on the surface of the coat film on the coat layer side, the test table is tilted by 1 °, and the angle at which the oleic acid droplets start to slide down is measured by the contact angle meter. This was defined as the oleic acid sliding angle (°). The results are shown in Table 2.

[Test Example 4] (Evaluation of finger oil wipeability)
The haze value (%) of the coated films produced in Examples and Comparative Examples was measured using a haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name “NDH5000”).

Subsequently, the finger was pressed against the surface of the coat film on the coat layer side three times to attach the finger oil. At this time, finger oil was attached to the extent that it could be visually confirmed. Next, after covering the part to which the finger oil is attached with a waste cloth (manufactured by Asahi Kasei Corporation, product name "Bencot (registered trademark)"), the waste cloth is reciprocated 10 cm or 3 times while applying a load of 200 g / cm ² . It was wiped off by rubbing.

After the wiping treatment, a haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name "NDH5000") is used to measure the haze value (%) of the portion of the surface of the coat film on the coat layer side to which finger oil has adhered. Measured using.

Then, the haze value difference (point) was calculated by subtracting the haze value (%) measured before the finger oil adhered from the haze value (%) measured after the wiping treatment. The results are shown in Table 2.

Furthermore, regarding the obtained haze value difference (point), the finger oil wiping property was evaluated based on the following criteria. The results are shown in Table 2.
⊚: The haze value difference (point) was less than 2.8.
◯: The haze value difference (point) was 2.8 or more and less than 3.9.
Δ: The haze value difference (point) was 3.9 or more and less than 5.1.
X: The haze value difference (point) was 5.1 or more.

[Test Example 5] (Evaluation of ink wipeability)
The haze value (%) of the coated films produced in Examples and Comparative Examples was measured using a haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name “NDH5000”).

Subsequently, an oil-based marker (manufactured by Zebra, product name "Hi-McKee MO-150-MC", ink color; black) was used to attach ink to the surface of the coat film on the coat layer side, and then the ink was applied. The ink has dried sufficiently. Next, after covering the part to which the ink is attached with a waste cloth (manufactured by Asahi Kasei Corporation, product name "Bencot (registered trademark)"), rub the waste cloth 10 cm or 3 times while applying a load of 200 g / cm ² . Therefore, the wiping process was performed.

After the wiping treatment, a haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name "NDH5000") is used to measure the haze value (%) of the portion to which the ink is adhered on the surface of the coat film on the coat layer side. Was measured.

Then, the haze value difference (point) was calculated by subtracting the haze value (%) measured before the finger oil adhered from the haze value (%) measured after the wiping treatment. The results are shown in Table 2.

Further, the obtained haze value difference (point) was evaluated for ink wiping property based on the following criteria. The results are shown in Table 2.
⊚: The haze value difference (point) was less than 2.8.
◯: The haze value difference (point) was 2.8 or more and less than 3.9.
Δ: The haze value difference (point) was 3.9 or more and less than 5.1.
X: The haze value difference (point) was 5.1 or more.

[Test Example 6] (Evaluation of glare resistance)
A tablet terminal (manufactured by Apple Inc., product) in which the coated films manufactured in Examples and Comparative Examples are displayed in green (RGB values (R, G, B) = 0,255,0) with the base material side facing down. It was placed on the surface of a display screen with the name "iPad (registered trademark)" and resolution: 264ppi), and the glare resistance was visually evaluated according to the following criteria. The results are shown in Table 2.
⊚: No glare was confirmed.
◯: Glitter was confirmed at a level where there was no problem in practical use.
X: Glitter was confirmed at a level that caused practical problems.

[Test Example 7] (Evaluation of white tea resistance)
Display of a tablet terminal (manufactured by Apple Inc., product name "iPad (registered trademark)", resolution: 264ppi) in which a predetermined image is displayed on the coated film produced in Examples and Comparative Examples with the base material side facing down. It was placed on the surface of the screen, and the presence or absence of white browning of the image and blurring of the image was visually confirmed, and the white browning resistance was evaluated according to the following criteria. The results are shown in Table 2.
⊚: Neither white tea nor blur was confirmed.
◯: Either white tea or blur was confirmed at a level where there was no problem in practical use.
X: Either white tea or blur was confirmed at a level that caused practical problems.

[Test Example 8] (Evaluation of scratch resistance)
The number of scratches on the surface of the coat layer side of the coat film produced in Examples and Comparative Examples after rubbing 10 cm and 10 round trips with a load of 250 g / cm ² using # 0000 steel wool. Was counted, and the scratch resistance was evaluated according to the following criteria. The results are shown in Table 2.
⊚: The number of scratches was less than 3.
◯: The number of scratches was 4 or more and less than 10.
X: The number of scratches was 11 or more.

[Test Example 9] (Measurement of reflectance)
The surface of the coat film produced in Examples and Comparative Examples on the base film side was attached to one side of a black plate (manufactured by Yukou Trading Co., Ltd., product name "Acrylite"). Then, the reflectance (%) of the surface on the first coat layer (coat layer) side of the coat film is measured by using an ultraviolet visible near infrared spectrophotometer (manufactured by Shimadzu Corporation, product name "UV-3600"). The measurement was performed with the measurement wavelength region set to 370 to 810 nm. The results are shown in Table 2.

[Test Example 10] (Evaluation of display visibility)
The surface of the coat film produced in Examples and Comparative Examples on the base film side was attached to one side of the transparent glass plate to obtain a laminate of the coat film and the glass plate (thickness: 1.1 mm). Subsequently, the laminate was laminated on the display of a tablet terminal (manufactured by Apple Inc., product name "iPad (registered trademark)", pixel density: 264 ppi). At this time, the surface of the laminated body on the glass plate side was laminated so as to be in contact with the display. Then, a predetermined image was displayed on the display surface of the tablet terminal, and the display visibility was evaluated according to the following criteria. The results are shown in Table 2.
⊚: The image was clearly visible and was very well visible.
◯: The image was slightly blurred, but it was clearly visible.
Δ: The image was blurred and the visibility was slightly poor.
X: The image was greatly blurred and the visibility was poor.

As is clear from Table 2, the coat film produced in the examples was extremely excellent in finger oil wiping property and ink wiping property.

In the test related to the measurement of the water contact angle and the oleic acid contact angle, the angles were almost the same in both the coated films produced in Examples and Comparative Examples, and in the test related to the measurement of the water sliding angle. The result was that no water droplets slipped off in any of the coated films produced in Examples and Comparative Examples (Test Example 3). As described above, even when there is no difference in the water contact angle, the oleic acid contact angle and the water sliding angle, by setting the oleic acid sliding angle within a predetermined range, the coat film having excellent finger oil wiping property is obtained. It was proved that it can be manufactured.

Further, the coated film produced in the examples was also excellent in glare resistance, white tea resistance, scratch resistance and display visibility.

The coated film of the present invention can be suitably used as the outermost layer of the touch panel.

1,2 ... Coat film 10,20 ... Coat layer 21 ... First coat layer 22 ... Second coat layer 30 ... Base film

Claims (8)

A coat film comprising a base film and a coat layer provided on one surface side of the base film.
The oleic acid sliding angle of the surface of the coat layer opposite to the base film is 32 ° or less.
The coat layer is formed by curing a coating composition containing an organic-inorganic hybrid resin .
The organic-inorganic hybrid resin is obtained by binding an organic compound having a polymerizable unsaturated group to inorganic fine particles via a silane coupling agent.
A coat film characterized by that. The coat film according to claim 1, wherein the organic-inorganic hybrid resin is a substance obtained by binding an organic compound having a polymerizable unsaturated group to inorganic fine particles. The coated film according to claim 1 or 2, wherein the total haze value of the coated film is 3% or more and 60% or less. The coat film according to any one of claims 1 to 3, wherein the coat layer is formed by curing a coating composition containing fine particles. The coat film according to claim 4, wherein the average particle size of the fine particles is 0.5 μm or more and 8 μm or less. The coat film according to claim 4 or 5, wherein the fine particles are organic fine particles. 4. The coating composition comprises nanoparticles having an average particle size of 5 nm or more and 100 nm or less and a refractive index of 1.6 or more and 3.0 or less together with the fine particles. The coat film according to any one of 6. The first coat layer located proximal to the base film and the first coat layer located distal to the base film and having a lower refractive index than the first coat layer. The coat film according to any one of claims 1 to 7, wherein the coat film comprises 2 coat layers.

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