JP7257725B2 - hard coat film - Google Patents

Description

The present invention relates to a hard coat film, and more particularly, flat panel displays such as liquid crystal display devices, plasma display devices and electroluminescence (EL) display devices, display device parts such as touch panels, and windows of buildings, automobiles and trains. The present invention relates to a hard coat film provided with a hard coat layer that can be used as a protective film for glass or the like.

A display surface of a flat panel display such as a liquid crystal display (LCD) is required to be scratch-resistant so as not to be scratched during handling and reduce visibility. Therefore, it is common practice to provide scratch resistance by using a hard coat film in which a hard coat layer is provided on a base film. In recent years, with the spread of touch panels that allow users to input data and instructions by touching the screen with a finger or pen while looking at the display, the functional requirements for a hard coat film that maintains optical visibility and is scratch resistant have increased. rising.

Therefore, polyethylene terephthalate film, polyethylene naphthalate film, and cycloolefin film, which are excellent in transparency, heat resistance, dimensional stability, and low moisture absorption, are expected to be used for optical members as base films. , and cycloolefin films with excellent optical isotropy are particularly expected. A hard coat layer is provided on such a base film in order to further impart hard properties. However, such a base film has a problem that the adhesiveness between the base film and the hard coat layer is poor due to the small number of polar groups on the film surface.

Therefore, conventionally, methods for imparting easy adhesion to the hard coat layer to these base films have been disclosed in Patent Documents 1 and 2, and the like.

Japanese Patent Application Laid-Open No. 2001-147304 JP 2006-110875 A

Conventionally, as a method for imparting easy adhesion to a cycloolefin film with a hard coat layer, Patent Document 1 discloses corona treatment, plasma treatment, UV treatment, and the like. Adhesion to the hard coat layer is insufficient, and there is a problem that poor adhesion tends to occur over time.

Further, Patent Document 2 discloses coating an anchor coating agent made of an olefin resin on a cycloolefin film. This anchor coat treatment improves the adhesion between the cycloolefin film and the hard coat layer to some extent. There is a problem that cracks (film breakage, cracks, etc.) tend to occur on the surface of the hard coat layer due to the difference in shrinkage between the two coating films under the condition (for example, stored in a dryer at 100° C. for 5 minutes).

Therefore, the present invention provides a hard coat layer having excellent adhesion and durability over time under normal conditions and under moist and heat resistant conditions even for substrate films such as cycloolefin films that have few polar groups and poor adhesion. An object of the present invention is to provide a coated film.

The present inventors have made intensive studies to solve the above problems, and found that by using a resin with a characteristic infrared spectrum for the hard coat layer, there are few polar groups such as cycloolefin films and poor adhesion. The inventors have found that the adhesiveness between the base film and the hard coat layer can be improved, and have completed the present invention.

That is, the present invention has the following configurations.
(1) A hard coat film having a hard coat layer containing an ionizing radiation curable resin on at least one side of a base film, wherein the ionizing radiation curable resin satisfies the following condition (I): hard coat film.
Condition (I): Peak area ratio 1 (A/C × 100) is 5% or more (where A is the peak area appearing at 3250 to 3500 cm ⁻¹ in infrared spectroscopic measurement of the uncured ionizing radiation curable resin , 1650 to 1800 cm ⁻¹ is the peak area C.)
(2) The hard coat film of (1), wherein the ionizing radiation-curable resin further satisfies the following condition (II).
Condition (II): The peak area ratio 2 (B/C×100) is 5% or more (where B is the peak area appearing at 1500 to 1580 cm ⁻¹ in infrared spectroscopic measurement of the uncured ionizing radiation curable resin. , 1650 to 1800 cm ⁻¹ is the peak area C.)
(3) The hard coat film according to any one of (1) to (2), wherein the hard coat layer further satisfies the following condition (III).
Condition (III): peak area ratio 3 (D/E × 100) is less than 400% (however, in infrared spectroscopic measurement of the hard coat layer after curing, the peak area appearing at 855 to 1325 cm ^-1 is D, Let E be the peak area appearing at 1650 to 1800 cm ⁻¹ ).
(4) The hard coat film according to any one of (1) to (3), wherein the ionizing radiation-curable resin contains an acrylic resin containing a (meth)acryloyl group.
(5) The hard coat film according to any one of (1) to (4), wherein the base film is selected from cycloolefin film, polyethylene terephthalate and polyethylene naphthalate.

According to the present invention, even for a base film such as a cycloolefin film that has few polar groups and poor adhesion, the hard coat layer has excellent adhesion and durability over time under normal conditions and under moist and heat resistant conditions. A coated film can be provided.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is explained in full detail.
The present invention is a hard coat film having a hard coat layer containing an ionizing radiation curable resin on at least one side of a substrate film, wherein the ionizing radiation curable resin satisfies the following condition (I). It is a hard coat film that
Condition (I): Peak area ratio 1 (A/C × 100) is 5% or more (where A is the peak area appearing at 3250 to 3500 cm ⁻¹ in infrared spectroscopic measurement of the uncured ionizing radiation curable resin , 1650 to 1800 cm ⁻¹ is the peak area C.)

[Base film]
First, the base film of the hard coat film will be described.

In the present invention, the base film of the hard coat film is not particularly limited. can be done. Among them, it is preferable to use polyethylene terephthalate, polyethylene naphthalate, and cycloolefin film, which are excellent in transparency, heat resistance, dimensional stability, and low moisture absorption. etc.

A cycloolefin film is a film in which cycloolefin units are alternately or randomly polymerized in the polymer skeleton and have an alicyclic structure in the molecular structure. A cycloolefin copolymer film or a cycloolefin polymer film, which is a (co)polymer containing at least one compound selected from alicyclic hydrocarbons, is targeted, and either one can be appropriately selected and used.

Further, in the present invention, the thickness of the base film is appropriately selected according to the use of the hard coat film, but it is in the range of 10 μm to 300 μm from the viewpoint of mechanical strength, handleability, etc. more preferably in the range of 20 μm to 200 μm.

In the present invention, the heat resistance of the base film is measured by thermogravimetry (TG) or differential scanning calorimetry, which measures the thermal change when a temperature change is applied to the sample when it is used for a hard coat film. It is preferable to use a film having a glass transition temperature of about 120° C. to 170° C. as measured by a (DSC) method or the like.

In the present invention, the base film is a resin obtained by kneading a resin constituting the base film and an ultraviolet absorber for the purpose of preventing deterioration of the coating film and poor adhesion due to ultraviolet rays when used for a hard coat film. may be formed into a film, or a film obtained by coating one or both sides of a substrate film with a coating material in which a thermoplastic or thermosetting resin and an ultraviolet absorber are mixed may be used. As for the ultraviolet shielding property, the transmittance at a wavelength of 380 nm measured by a spectrophotometer is preferably 10% or less. More preferably, it is 7% or less.

[Hard coat layer]
Next, the hard coat layer will be described.

In the present invention, the resin contained in the hard coat layer is not particularly limited as long as it is a resin that forms a film. In addition, it is preferable to use an ionizing radiation curable resin in that the degree of cross-linking can be adjusted by the amount of exposure to ultraviolet rays, and the surface hardness of the hard coat layer can be adjusted.

The ionizing radiation-curable resin used in the present invention is a transparent resin that is cured by irradiation with ultraviolet rays (hereinafter abbreviated as "UV") or electron beams (hereinafter abbreviated as "EB"). It preferably contains an acrylic resin containing a (meth)acryloyl group, more preferably a urethane acrylate resin containing a (meth)acryloyl group.

^The ionizing radiation curable resin used in the present invention is measured by infrared spectroscopy in an uncured state ^. When B is the area of the peak range appearing at 1650 to 1800 cm ⁻¹ is C, condition (I): It is important that the peak area ratio 1 (A / C × 100) is 5% or more, and 10 % or more is preferable.

Furthermore, condition (II): Peak area ratio 2 (B/C×100) is preferably 5% or more, more preferably 10% or more.

In the ionizing radiation curable resin, the peak appearing at 1650-1800 cm ⁻¹ represents the carbon-carbon double bond of the acryloyl group. A peak appearing at 3250 to 3500 cm ⁻¹ is presumed to represent a nitrogen-hydrogen bond derived from an amide group or an oxygen-hydrogen bond derived from a hydroxyl group. In other words, by having a peak appearing at 3250 to 3500 cm ⁻¹ at a certain ratio or more with respect to the existing ratio of acryloyl groups, the adhesion of the hard coat layer to the substrate due to the acryloyl groups and the hard coat layer shrinks on curing within the layer. As a result, the balance between the interface of the base film and the peeling force applied in a different direction is maintained, so there is no need to modify the anchor layer or base film even for cycloolefin films with few polar groups. In addition, it is presumed that the adhesion to the base film can be significantly improved.

Further, peaks appearing at 1500 to 1580 cm ⁻¹ are presumed to represent nitrogen-hydrogen bonds derived from amide groups, carbon-hydrogen bonds derived from phenyl rings, or nitrogen-nitrogen double bonds derived from azo groups. In the same manner as described above, it is presumed that the presence of a peak at 1500 to 1580 cm ⁻¹ at a certain ratio or more relative to the acryloyl group presence ratio can significantly improve the adhesion to the substrate film.

As the resin contained in the hard coat layer, in addition to the ionizing radiation-curable resin having the above-mentioned specific IR peak, polyethylene, polypropylene, polystyrene, polycarbonate, polyester, acrylic, styrene-acrylic, cellulose, etc. Thermosetting resins such as thermoplastic resins, phenolic resins, urea resins, unsaturated polyesters, epoxies, and silicon resins are blended within a range that does not impair the effects of the present invention and the hardness and scratch resistance of the hard coat layer. may

As the photopolymerization initiator for the ionizing radiation-curable resin contained in the hard coat layer, commercially available acetophenones such as IRGACURE 651 and IRGACURE 184 (both trade names: manufactured by BASF), and IRGACURE 500 (trade name). Benzophenones such as BASF Corporation) can be used, but organic peroxides such as diacyl peroxides are preferably used in order to further improve adhesion.

In the present invention, the hard coat layer may contain inorganic oxide fine particles to further improve the surface hardness (scratch resistance). In this case, the average particle size of the inorganic oxide fine particles is preferably in the range of 5 to 50 nm, more preferably in the range of 10 to 20 nm. If the average particle size is less than 5 nm, it is difficult to obtain sufficient surface hardness. On the other hand, if the average particle size exceeds 50 nm, the glossiness and transparency of the hard coat layer may decrease, and the flexibility may also decrease.

In the present invention, examples of the inorganic oxide fine particles include alumina and silica. Among these, alumina containing aluminum as a main component is particularly suitable because it has high hardness and can be effective with a smaller addition amount than silica.

In the present invention, the content of the inorganic oxide fine particles is preferably 0.1 to 10.0 parts by weight with respect to 100 parts by weight of the solid content of the hard coat layer coating composition. If the content of the inorganic oxide fine particles is less than 0.1 parts by weight, it is difficult to obtain the effect of improving the surface hardness (scratch resistance). On the other hand, when the content exceeds 10.0 parts by weight, the haze increases, which is not preferable.

In addition, in the hard coat layer, a leveling agent can be used for the purpose of improving coatability. Available. The blending amount can be in the range of 0.03 to 3.0 parts by weight per 100 parts by weight of the solid content of the resin of the hard coat layer. In touch panel applications, etc., when adhesion resistance using optical transparent resin OCR is required for the purpose of adhesion with cover glass (CG) of touch panel terminal, transparent conductive member (TSP), liquid crystal module (LCM), etc. Therefore, it is preferable to use an acrylic leveling agent or a fluorine-based leveling agent with a high surface free energy (approximately 40 mJ/cm ² or more).

Other additives added to the hard coat layer include antifoaming agents, surface tension modifiers, antifouling agents, antioxidants, antistatic agents, ultraviolet absorbers, and light stabilizers, as long as they do not impair the effects of the present invention. You may mix|blend an agent etc. as needed.

The hard coat layer is formed by coating the base film with a paint prepared by dissolving and dispersing a polymerization initiator, other additives, etc. in an appropriate solvent in addition to the ionizing radiation-curable resin described above, and drying the coating. be done. The solvent can be appropriately selected according to the solubility of the resin to be blended, and any solvent that can uniformly dissolve or disperse at least the solid content (resin, polymerization initiator, and other additives) may be used. Examples of such solvents include aromatic solvents such as toluene, xylene and n-heptane, aliphatic solvents such as cyclohexane, methylcyclohexane and ethylcyclohexane, methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate and acetic acid. Known organic solvents such as ester solvents such as butyl and methyl lactate, ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone, and alcohol solvents such as methanol, ethanol, isopropyl alcohol and n-propyl alcohol alone Alternatively, several types can be appropriately combined and used.

The method of coating the hard coat layer is not particularly limited, but gravure coating, micro gravure coating, fountain bar coating, slide die coating, slot die coating, screen printing, spray coating, etc. After coating by a known coating method, it is usually dried at a temperature of about 50 to 120°C.

The coating thickness of the hard coat layer is not particularly limited, but is preferably in the range of 1.0 μm to 12.0 μm, for example. If the coating thickness is less than 1.0 μm, it becomes difficult to obtain the required surface hardness. On the other hand, if the coating thickness exceeds 12.0 μm, curling is strongly generated, and the handleability in the manufacturing process is deteriorated, which is not preferable. The coating thickness of the hard coat layer can be measured by actual measurement with a micrometer.

In the present invention, the hard coat layer coating containing the ionizing radiation curable resin is coated on the base film, dried, and then irradiated with UV or EB to cause photopolymerization and a coating film having excellent hard properties ( hard coat layer) can be obtained. In particular, a hard coat layer having a pencil hardness of B to 2H as defined in JIS K5600-5-4 is preferred.

In the hard coat film of the present invention, the area of the peak appearing at 855 to 1325 cm ^-1 is D, and the area of the peak appearing at 1650 to 1800 cm ^-1 is E in infrared spectroscopic measurement of the hard coat layer after curing. , the peak area ratio 3 (D/E×100) is preferably less than 400%, more preferably 380% or less. The lower limit of the peak area ratio 3 is preferably 300% or more. If the hard coat layer has a peak area ratio of 3 that satisfies the range of the present invention, it has good adhesion and good adhesion even to substrate films such as cycloolefin films and polyimide films, which have few polar groups and are difficult for the hard coat layer to adhere to. You can get the look.
It is assumed that the infrared spectral peak appearing at 1650 to 1800 cm ⁻¹ in the cured hard coat layer is equivalent to the peak appearing in the ionizing radiation curable resin described above.
Further, in the present invention, in the hard coat layer after curing, the peak of the infrared spectrum appearing at 855 to 1325 cm ⁻¹ is the carbon-oxygen stretching vibration of an ether group or an ester group, or the carbon-hydrogen transformation of a carbonyl group. It originates from various structures such as angular vibration, silica skeleton, aluminum oxide skeleton, etc., which are inorganic fine particles. It is presumed that by making the peak appear at 855 to 1325 cm ⁻¹ , which is less than a certain percentage of the acryloyl groups, the adhesion to the substrate film can be balanced.

EXAMPLES The present invention will be specifically described in detail below with reference to examples, but the present invention is not limited to the following examples. At the same time, a comparative example will also be described.

In addition, "%" described below represents "% by weight" unless otherwise specified.

[Production Example 1]
Urethane acrylate UV curable resin "TOMAX FA-3312-2" (solid content 40%, manufactured by Nippon Kako Toryo Co., Ltd.) is the main agent, and butyl acetate makes the solid content concentration in the UV curable resin paint 30%. The hard coat layer coating material 1 was prepared by diluting the solution until it became

[Production Example 2]
The above urethane acrylate UV-curable resin "TOMAX FA-3312-2" (solid content 40%, manufactured by Nippon Kako Toryo Co., Ltd.) and urethane acrylate UV-curable resin "A-9550" (solid content 100%, Shin-Nakamura Chemical Co., Ltd.) as the main agent, TOMAX FA-3312-2 and A-9550 are blended so that the solid content blending ratio is 80/20, and butyl acetate is used to increase the solid content concentration in the UV-curable resin paint. Hard coat layer paint 2 was prepared by diluting to 30% and sufficiently stirring.

[Production Example 3]
A hard coat layer paint 3 was obtained in the same manner as in Production Example 2 except that the solid content blending ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was changed to 75/25.

[Production Example 4]
A hard coat layer paint 4 was obtained in the same manner as in Production Example 2 except that the solid content blending ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was changed to 50/50.

[Production Example 5]
A hard coat layer paint 5 was obtained in the same manner as in Production Example 1 except that TOMAX FA-3312-2 in Production Example 1 was changed to TOMAX FA-3312-4.

[Production Example 6]
A hard coat layer paint 6 was obtained in the same manner as in Production Example 2, except that the solid content mixing ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was changed to 30/70.

[Production Example 7]
A hard coat layer paint 7 was obtained in the same manner as in Production Example 2 except that the solid content blending ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was changed to 10/90.

[Production Example 8]
Urethane acrylate UV-curable resin “A-9550” (solid content 100%, manufactured by Shin-Nakamura Chemical Co., Ltd.) was used instead of “TOMAX FA-3312-2” used in the hard coat layer of Production Example 1. A hard coat layer paint 8 was obtained in the same manner as in Production Example 1 except for the above.

[Production Example 9]
Urethane acrylate UV-curable resin "BS-575CSB" (solid content 100%, manufactured by Arakawa Chemical Industries, Ltd.) was used instead of "TOMAX FA-3312-2" used in the hard coat layer of Production Example 1. A hard coat layer paint 9 was obtained in the same manner as in Production Example 1 except for the above.

[Reference example]
As a reference example, 100% butyl acetate used as a dilution solvent is shown.

<Examples 1 to 13 and Comparative Examples 1 to 4>
Select the base film and the hard coat layer paint so that the combination shown in Table 2 is obtained. It was dried with hot air for 1 minute in a drying oven to form a coating layer having a coating thickness of 2.5 μm. Using a UV irradiation device set at a height of 60 mm from the coating surface, this was cured at a UV irradiation amount of 250 mJ/cm ² to form a hard coat layer, Examples 1 to 13 and Comparative Examples 1 to 4. of the hard coat film was obtained.

<Evaluation method>
The obtained hard coat films of the above Examples and Comparative Examples were evaluated according to the following criteria. The results are summarized in Table 1.

(1) Peak area ratio of ionizing radiation curable resin 1 to 2
Using an infrared spectrophotometer, an infrared spectroscopic spectrum (infrared absorption spectrum) was measured by the ATR method for an uncured ionizing radiation curable resin. An FT-IR Spectrometer Spectrum 100 (manufactured by PerkinElmer Japan) was used as an infrared spectrophotometer.

As the measurement method, under an environment of temperature 23° C./humidity 50%, 10 μm of the hard coat layer paint or butyl acetate of the reference example was dropped onto the measurement site (sensor portion) of the infrared spectrophotometer, and IR measurement was performed immediately after dropping. .

On the spectrum chart obtained with the wave number (cm ⁻¹ ) on the horizontal axis and the absorbance on the vertical axis, baselines are drawn at 3250 to 3500 cm ⁻¹ , 1500 to 1580 cm ⁻¹ , and 1650 to 1800 cm ⁻¹ , respectively. The areas surrounded by the baseline and the spectral curve were A, B, and C, respectively, and their ratios (A/C×100) and (B/C×100) were defined as peak area ratios of 1 to 2, respectively.

(2) Hard coat layer peak area ratio 3
An infrared spectrophotometer (infrared absorption spectrum) was measured by the ATR method on the surface of the hard coat layer of the hard coat film using an infrared spectrophotometer. An FT-IR Spectrometer Spectrum 100 (manufactured by PerkinElmer Japan) was used as an infrared spectrophotometer. Baselines are drawn at 855-1325 cm-1 and 1650-1800 cm-1 on the obtained spectrum chart with the horizontal axis as the wavenumber (cm-1) and the vertical axis as the absorbance, and the baseline and the spectrum curve are compared. The areas enclosed by are defined as D and E, respectively, and the ratio (D/E×100) was defined as a peak area ratio of 3.

(3) Adhesion Adhesion was evaluated by a cross-cut peel test according to JIS-K5600-5-6. On the hard coat layer forming surface of the hard coat film, using a cutter knife, cut 11 vertical and 11 horizontal cuts at 1 mm intervals in a grid pattern to carve a total of 100 square squares, Sekisui Chemical Co., Ltd. Adhesive tape No. 252 manufactured by the company was adhered thereon, pressed uniformly with a spatula, peeled off in the direction of 60 degrees, and the number of remaining hard coat layers was evaluated on a 4-grade scale. Judgment was made after crimping and peeling were performed 5 times at the same location. The evaluation criteria are as follows. Products evaluated as ⊚ and ○ were judged to have acceptable adhesion, but products evaluated as Δ were practically acceptable.

Evaluation criteria ◎: 100 pieces ○: 99 to 90 pieces △: 89 to 50 pieces ×: 49 to 0 pieces

(4) Scratch resistance For each hard coat film produced in Examples and Comparative Examples, the hard coat layer surface was subjected to a test method according to JIS-K5600-5-10 using steel wool #0000 and a load of 250 g / cm ² was applied and rubbed back and forth 10 times, and the degree of damage was evaluated according to the following criteria. The ◯ evaluation product was considered to have good scratch resistance, but the △ evaluation product can also be used as a product.

Evaluation Criteria ⊚: No damage occurred. ◯: 1 to 5 scratches are generated. Δ: 6 to 10 scratches are generated. x: 10 or more scratches are generated.

The notation of the base material in Table 2 is as follows.
ZF16: Cycloolefin film (thickness 100 μm, manufactured by Nippon Zeon Co., Ltd.)
A4300: polyethylene terephthalate film (thickness 100 μm, manufactured by Toyobo Co., Ltd.)
Q65HW: polyethylene naphthalate film (thickness 100 μm, manufactured by Teijin Film Solutions Co., Ltd.)

As is clear from the results in Table 2, according to the examples of the present invention, the adhesion and durability of the hard coat layer are excellent even for substrate films with few polar groups and poor adhesion, such as cycloolefin films. A hard coat film can be provided. On the other hand, according to the comparative example, the adhesion is particularly poor.

Claims (5)

A hard coat film having a hard coat layer containing an ionizing radiation curable resin on at least one side of a base film,
The base film is any one selected from cycloolefin film, polyethylene terephthalate, and polyethylene naphthalate,
The ionizing radiation curable resin includes a urethane acrylate resin containing a (meth)acryloyl group,
The ionizing radiation curable resin satisfies the following condition (I) ,
A hard coat film, wherein the hard coat layer further satisfies the following condition (III) .
Condition (I): Peak area ratio 1 (A/C × 100) is 5% or more (where A is the peak area appearing at 3250 to 3500 cm ⁻¹ in infrared spectroscopic measurement of the uncured ionizing radiation curable resin , 1650 to 1800 cm ⁻¹ is the peak area C.)
Condition (III): Peak area ratio 3 (D/E × 100) is less than 400%
(However, in infrared spectroscopic measurement of the hard coat layer after curing, the peak area appearing at 855 to 1325 cm ^-1 is defined as D, and the peak area appearing at 1650 to 1800 cm ^-1 is defined as E.) 2. The hard coat film according to claim 1, wherein the ionizing radiation-curable resin further satisfies the following condition (II).
Condition (II): The peak area ratio 2 (B/C×100) is 5% or more (where B is the peak area appearing at 1500 to 1580 cm ⁻¹ in infrared spectroscopic measurement of the uncured ionizing radiation curable resin. , 1650 to 1800 cm ⁻¹ is the peak area C.) 3. The hard coat film according to claim 1, wherein the base film is a cycloolefin film. 4. The hard coat according to any one of claims 1 to 3, wherein the hard coat film is evaluated for adhesion by the following test method, and is evaluated as "⊚", "◯", or "Δ". the film.
Adhesion was evaluated by a cross-cut peeling test according to JIS-K5600-5-6. On the hard coat layer forming surface of the hard coat film, using a cutter knife, cut 11 vertical and 11 horizontal cuts at 1 mm intervals in a grid pattern to carve a total of 100 square squares, Sekisui Chemical Co., Ltd. Adhesive tape No. 252 manufactured by the company was adhered thereon, pressed uniformly with a spatula, peeled off in the direction of 60 degrees, and the number of remaining hard coat layers was evaluated on a 4-grade scale. Judgment was made after crimping and peeling were performed 5 times at the same location. Evaluation criteria are as follows.
Evaluation criteria
◎: 100 pieces ○: 99 to 90 pieces △: 89 to 50 pieces ×: 49 to 0 pieces 5. The hard coat film according to any one of claims 1 to 4, wherein the scratch resistance of the hard coat film is evaluated by the following test method as "excellent" or "good".
For the hard coat film, the hard coat layer surface was coated with #0000 steel wool under a load of 250 g/cm by a test method according to JIS-K5600-5-10. ² It was rubbed back and forth 10 times under a pressure, and the degree of scratching was evaluated according to the following criteria.
Evaluation criteria
A: No damage occurred. ◯: 1 to 5 scratches are generated. Δ: 6 to 10 scratches are generated. x: 10 or more scratches are generated.