Hard coat film

Abstract

To provide a hard coat film whose hard coat layer is excellent in adhesion over time even to a base material film such as a cycloolefin film which is small in a polar group and is inferior to adhesion under normal condition and under moisture and heat resistance condition, and durability.SOLUTION: A hard coat film has a hard coat layer containing an ionizing radiation-curable resin provided on at least one surface of a base material film, wherein the base material film is selected from a cycloolefin film, polyethylene terephthalate and polyethylene naphthalate, the ionizing radiation-curable resin contains an urethane acrylate resin containing a (meth)acryloyl group, and the ionizing radiation-curable resin satisfies the following conditions (I) and (II). Condition (I): A peak area ratio 1 (A / C×100) is 5% or more, a peak area appearing at 3,250-3,500 cm-1 in infrared spectroscopic spectrum measurement of an uncured ionizing radiation-curable resin is represented as A, and a peak area appearing at 1,650-1,800 cm-1 is represented as C. Condition (II): A peak area 2 (B / C×100) is 5% or more, a peak area appearing at 1,500-1,580 cm-1 in infrared spectroscopic spectrum measurement of an uncured ionizing radiation-curable resin is represented as B, and a peak area appearing at 1,650-1,800 cm-1 is represented as C.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a hard coat film, and more particularly, to a hard coat film provided with a hard coat layer that can be used as a protection film for flat panel displays such as liquid crystal display devices, plasma display devices, and electroluminescence (EL) display devices, display device components such as touch panels, and window glasses of buildings, automobiles, and trains.

Background Art

[0002] It is required to impart scratch resistance to the display surface of flat panel displays such as liquid crystal display devices (LCDs) so that it is not scratched during handling and visibility is not reduced. Therefore, it is generally practiced to impart scratch resistance by using a hard coat film provided with a hard coat layer on a base film. In recent years, with the popularization of touch panels that can input data and instructions by touching with a finger or a pen while viewing a display on a display screen, the functional requirements for hard coat films having optical visibility and scratch resistance have been increasing.

[0003] Therefore, polyethylene terephthalate films, polyethylene naphthalate, and cycloolefin films, which are excellent in transparency, heat resistance, dimensional stability, and low moisture absorption as base films, are expected to be used for optical member applications, and cycloolefin films, which are excellent in low birefringence and optical isotropy, are particularly highly expected. In order to further impart hardness to such a base film, a hard coat layer is provided. However, such a base film has a problem in that the adhesion between the base film and the hard coat layer is poor because the number of polar groups on the film surface is small.

[0004] Therefore, conventionally, methods for imparting easy adhesiveness to these base films with a hard coat layer have been disclosed in Patent Document 1, Patent Document 2, and the like.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-147304 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-110875 [Summary of the Invention] [Problems to be Solved by the Invention]

[0006] Conventionally, as a method for imparting easy adhesiveness to a cycloolefin film with a hard coat layer, Patent Document 1 discloses corona treatment, plasma treatment, UV treatment, etc. However, with these methods, the adhesion between the cycloolefin film and the hard coat layer is insufficient, and there is a problem that adhesion failure over time is particularly likely to occur.

[0007] Also, Patent Document 2 discloses applying an anchor coat agent made of an olefin-based resin on a cycloolefin film. By this anchor coat treatment, the adhesion between the cycloolefin film and the hard coat layer is improved to some extent. However, in the case of an anchor coat layer with a flexible and stretchable coating film and a hard coat layer with a hard and non-stretchable coating film, due to the shrinkage difference between the two coating films under heat-resistant conditions (for example, stored in a dryer at a temperature of 100 °C for 5 minutes), there is a problem that cracks (film cracks, fissures, etc.) are likely to occur on the surface of the hard coat layer.

[0008] Therefore, an object of the present invention is to provide a hard coat film that is excellent in adhesion over time and durability of the hard coat layer under normal conditions and under humid heat conditions even for a base film such as a cycloolefin film having few polar groups and poor adhesion. [Means for Solving the Problems]

[0009] As a result of intensive studies to solve the above problems, the present inventors have found that by using a resin having a characteristic infrared absorption spectrum in the hard coat layer, the adhesion to a hard coat layer can be improved even for a base film such as a cycloolefin film having few polar groups and poor adhesion, and thus the present invention has been completed.

[0010] 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 provided on at least one side of a base film, wherein the ionizing radiation curable resin satisfies the following condition (I). Condition (I): The peak area ratio 1 (A / C × 100) is 5% or more (However, in the infrared absorption spectrum measurement of the uncured ionizing radiation curable resin, the peak area appearing at 3250 to 3500 cm -1 is defined as A, and the peak area appearing at 1650 to 1800 cm -1 is defined as C.) (2) The hard coat film according to (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 (However, in the infrared absorption spectrum measurement of the uncured ionizing radiation curable resin, the peak area appearing at 1500 to 1580 cm -1 is defined as B, and the peak area appearing at 1650 to 1800 cm -1 is defined as 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): The peak area ratio 3 (D / E × 100) is less than 400% (However, in the infrared absorption spectrum measurement of the cured hard coat layer, 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.) (4) The radiation-curable resin-containing hard coat film according to any one of (1) to (3) above is characterized in that the 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) above is characterized in that the base film is any one selected from a cycloolefin film, polyethylene terephthalate, and polyethylene naphthalate. [Advantages of the Invention]

[0011] According to the present invention, it is possible to provide a hard coat film excellent in adhesion over time and durability of the hard coat layer under normal conditions and under moist heat conditions, even for a base film having few polar groups and poor adhesion such as a cycloolefin film. [Embodiments for Carrying Out the Invention]

[0012] Hereinafter, embodiments for carrying out the present invention will be described in detail. The present invention is a hard coat film provided with a hard coat layer containing a radiation-curable resin on at least one side of a base film, and is characterized in that the radiation-curable resin satisfies the following condition (I). Condition (I): The peak area ratio 1 (A / C × 100) is 5% or more (However, in the infrared spectroscopic measurement of the uncured radiation-curable resin, the peak area appearing at 3250 to 3500 cm -1 is defined as A, and the peak area appearing at 1650 to 1800 cm -1 is defined as C.)

[0013] [Base Film] First, the base film of the hard coat film will be described.

[0014] In the present invention, the base film of the hard coat film is not particularly limited, and examples thereof include films or sheets of polyethylene terephthalate, polyamide, polyethylene, polyimide, polypropylene, acrylic resin, polystyrene, cellulose acetate, polyvinyl chloride, and the like. Among them, it is preferable to use polyethylene terephthalate, polyethylene naphthalate, and cycloolefin film, which are excellent in transparency, heat resistance, dimensional stability, low hygroscopicity, etc. The cycloolefin film is further excellent in low birefringence, optical isotropy, etc.

[0015] The cycloolefin film is one in which cycloolefin units are polymerized alternately or randomly in the polymer backbone and has an alicyclic structure in the molecular structure, and is a cycloolefin copolymer film or a cycloolefin polymer film which is a (co)polymer containing at least one compound selected from norbornene compounds, monocyclic cyclic olefins, cyclic conjugated dienes, and vinyl alicyclic hydrocarbons, and either one can be appropriately selected and used.

[0016] In the present invention, the thickness of the base film is appropriately selected according to the use of the hard coat film. From the viewpoints of mechanical strength, handleability, etc., it is preferably in the range of 10 μm to 300 μm, and more preferably in the range of 20 μm to 200 μm.

[0017] In the present invention, regarding the heat resistance of the base film, when used for hard coat film applications, the glass transition temperature measured by a thermogravimetric measurement (TG) method, a differential scanning calorimetry (DSC) method, etc., which measures the thermal change when the sample is given a temperature change, is preferably a film in the range of about 120°C to 170°C.

[0018] In the present invention, when the base film is used for hard coat film applications, for the purpose of preventing deterioration of the coating film and poor adhesion due to ultraviolet rays, a resin obtained by kneading a resin constituting the base film and an ultraviolet absorber is formed into a film, or a film obtained by coating one or both sides of the base film with a paint in which a thermoplastic or thermosetting resin and an ultraviolet absorber are mixed may be used. Regarding the ultraviolet cut-off property, it is preferable that the transmittance at a wavelength of 380 nm measured by a spectrophotometer is 10% or less. More preferably, it is 7% or less.

[0019] [Hard coat layer] Next, the above hard coat layer will be described.

[0020] In the present invention, as the resin contained in the hard coat layer, any resin that can form a film can be used without particular limitation. However, in particular, an ionizing radiation curable resin is preferably used in terms of imparting surface hardness (pencil hardness, scratch resistance) to the hard coat layer and being able to adjust the degree of crosslinking according to the exposure amount of ultraviolet rays, thereby enabling adjustment of the surface hardness of the hard coat layer.

[0021] The ionizing radiation curable resin used in the present invention is a transparent resin that cures by irradiation with ultraviolet rays (hereinafter abbreviated as "UV") or electron beams (hereinafter abbreviated as "EB"), and preferably contains an acrylic resin containing a (meth)acryloyl group, and more preferably is a urethane acrylate resin containing a (meth)acryloyl group.

[0022] The ionizing radiation curable resin used in the present invention, in the measurement of the infrared absorption spectrum in the uncured state, when the area of the peak range appearing at 3250 - 3500 cm -1 is defined as A, the area of the peak range appearing at 1500 - 1580 cm -1 is defined as B, and the area of the peak range appearing at 1650 - 1800 cm -1 is defined as C, the condition (I): the peak area ratio 1 (A / C × 100) being 5% or more is important, and 10% or more is preferable.

[0023] Furthermore, condition (II): The peak area ratio 2 (B / C × 100) is preferably 5% or more, and more preferably 10% or more.

[0024] In the ionizing radiation-curable resin, the peak appearing at 1650 - 1800 cm -1 represents the carbon-carbon double bond of the acryloyl group. The peak appearing at 3250 - 3500 cm -1 is presumed to represent the nitrogen-hydrogen bond derived from the amide group or the oxygen-hydrogen bond derived from the hydroxyl group. That is, by having a peak at 3250 - 3500 cm at a certain ratio or more with respect to the proportion of the acryloyl group, the balance between the adhesion of the hard coat layer to the substrate by the acryloyl group and the peeling force applied in a direction different from the interface of the substrate film due to the hard coat layer shrinking and curing in the layer is maintained. Therefore, it is presumed that the adhesion to the cycloolefin film with few polar groups can be significantly improved without the need to modify the anchor layer or the substrate film. -1 Furthermore, the peak appearing at 1500 - 1580 cm

[0025] is presumed to represent the nitrogen-hydrogen bond derived from the amide group, the carbon-hydrogen bond derived from the phenyl ring, or the nitrogen-nitrogen double bond derived from the azo group. Similarly to the above, by having a peak at 1500 - 1580 cm at a certain ratio or more with respect to the proportion of the acryloyl group, it is presumed that the adhesion to the substrate film can be significantly improved. -1 In addition, as the resin contained in the hard coat layer, in addition to the ionizing radiation-curable resin having the above-mentioned specific IR peak, thermoplastic resins such as polyethylene, polypropylene, polystyrene, polycarbonate, polyester, acrylic, styrene-acrylic, and cellulose, and thermosetting resins such as phenol resin, urea resin, unsaturated polyester, epoxy, and silicone resin may be blended within a range that does not impair the effects of the present invention, the hardness, and the scratch resistance of the hard coat layer. -1

[0026]

[0027] ​​ In addition, as the photoinitiator of the radiation-curable resin contained in the hard coat layer, acetophenones such as commercially available IRGACURE 651 and IRGACURE 184 (both are trade names: manufactured by BASF), and benzophenones such as IRGACURE 500 (trade name: manufactured by BASF) can be used, and there is no particular limitation. However, in order to further improve the adhesion, it is preferable to use organic peroxides such as diacyl peroxides.

[0028] In the present invention, it is also possible to contain inorganic oxide fine particles in the hard coat layer to further improve the surface hardness (scratch resistance). In this case, the average particle diameter of the inorganic oxide fine particles is preferably in the range of 5 to 50 nm, and more preferably in the range of 10 to 20 nm. If the average particle diameter is less than 5 nm, it is difficult to obtain sufficient surface hardness. On the other hand, if the average particle diameter exceeds 50 nm, the gloss and transparency of the hard coat layer may decrease, and the flexibility may also decrease.

[0029] In the present invention, examples of the inorganic oxide fine particles include alumina and silica. Among these, alumina mainly composed of aluminum is particularly preferable because it has a high hardness and the effect can be obtained with a smaller addition amount than silica.

[0030] In the present invention, the content of the inorganic oxide fine particles is preferably 0.1 to 10.0 parts by weight based on 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 part by weight, it is difficult to obtain the effect of improving the surface hardness (scratch resistance). On the other hand, if the content exceeds 10.0 parts by weight, the haze increases, which is not preferable.

[0031] In addition, for the purpose of improving coatability, a leveling agent can be used in the hard coat layer. For example, known leveling agents such as fluorine-based, acrylic-based, siloxane-based, and their adducts or mixtures can be used. The compounding amount can be in the range of 0.03 to 3.0 parts by weight based on 100 parts by weight of the solid content of the resin in the hard coat layer. Also, in applications such as touch panels, when adhesion to the cover glass (CG), transparent conductive member (TSP), liquid crystal module (LCM), etc. of the touch panel terminal is required using an optically transparent resin OCR for the purpose of adhesion, a leveling agent with a high surface free energy (about 40 mJ / cm 2 or higher), such as an acrylic-based leveling agent or a fluorine-based leveling agent, is preferably used.

[0032] As other additives to be added to the hard coat layer, within a range that does not impair the effects of the present invention, an antifoaming agent, a surface tension regulator, an antifouling agent, an antioxidant, an antistatic agent, an ultraviolet absorber, a light stabilizer, etc. may be blended as needed.

[0033] The hard coat layer is formed by coating and drying a paint in which a polymerization initiator, other additives, etc. are dissolved or dispersed in an appropriate solvent on the above-mentioned base film, in addition to the above-mentioned ionizing radiation-curable resin. The solvent can be appropriately selected according to the solubility of the above-mentioned resin to be blended, and any solvent that can uniformly dissolve or disperse at least the solid content (resin, polymerization initiator, 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, ester solvents such as methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, 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. These known organic solvents can be used alone or in an appropriate combination of several types.

[0034] The coating method of the above hard coat layer is not particularly limited. After coating with a known coating method such as gravure coating, microgravure coating, fountain coating, slide die coating, slot die coating, screen printing method, spray coating method, etc., it is usually dried at a temperature of about 50 to 120 °C.

[0035] The coating film thickness of the above hard coat layer is not particularly restricted. However, for example, it is preferably in the range of 1.0 μm to 12.0 μm. If the coating film thickness is less than 1.0 μm, it is difficult to obtain the required surface hardness. On the other hand, when the coating film thickness exceeds 12.0 μm, strong curling occurs and the handleability in the manufacturing process etc. deteriorates, which is not preferable. The coating film thickness of the hard coat layer can be measured by actual measurement with a micrometer.

[0036] In the present invention, after coating the base film with the above paint for a hard coat layer containing an ionizing radiation curable resin and drying, by irradiating with UV or EB, photopolymerization occurs and a coating film (hard coat layer) excellent in hardness can be obtained. In particular, it is preferably a hard coat layer having a pencil hardness defined in JIS K5600-5-4 of B to 2H.

[0037] In the hard coat film of the present invention, when the area of the peak appearing at 855 to 1325 cm -1 in the infrared spectroscopic measurement of the above hard coat layer after curing is defined as D, and the area of the peak appearing at 1650 to 1800 cm -1 is defined as E, 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. For a hard coat layer whose peak area ratio 3 satisfies the scope of the present invention, good adhesion and appearance can be obtained even for a base film with few polar groups such as a cycloolefin film or a polyimide film and to which the hard coat layer adheres poorly. In the hard coat layer after curing, at 1650 to 1800 cm -1The peak of the infrared spectrum that appears in [the relevant context] is assumed to be equivalent to the peak that appears in the ionizing radiation curable resin described above. Also, in the present invention, in the cured hard coat layer, the peak of the infrared spectrum that appears at 855 to 1325 cm -1 is derived from various structures such as the carbon-oxygen stretching vibration of ether groups and ester groups, the carbon-hydrogen bending vibration of carbonyl groups, and the silica skeleton and aluminum oxide skeleton which are inorganic fine particles. By setting the peak that appears at 855 to 1325 cm -1 to be below a certain ratio with respect to the existence ratio of acryloyl groups, it is presumed that a balance with the adhesiveness to the base film can be achieved.

Examples

[0038] Hereinafter, the present invention will be specifically described in detail with reference to examples, but the present invention is not limited to the following examples. At the same time, comparative examples will also be described.

[0039] Unless otherwise specified, “%” described below represents “wt%”.

[0040] [Production Example 1] Using the urethane acrylate-based ultraviolet curable resin “TOMAX FA-3312-2” (solid content 40%, manufactured by Nippon Kayaku Co., Ltd.) as the main agent, it was diluted with butyl acetate until the solid content concentration in the paint of the ultraviolet curable resin reached 30% and stirred well to prepare Hard coat layer paint 1.

[0041] [Production Example 2] Using the above urethane acrylate-based ultraviolet curable resin “TOMAX FA-3312-2” (solid content 40%, manufactured by Nippon Kayaku Co., Ltd.) and urethane acrylate-based ultraviolet curable resin “A-9550” (solid content 100%, manufactured by Shin-Nakamura Chemical Co., Ltd.) as the main agents, they were blended so that the solid content blending ratio of TOMAX FA-3312-2 and A-9550 was 80 / 20, and diluted with butyl acetate until the solid content concentration in the paint of the ultraviolet curable resin reached 30% and stirred well to prepare Hard coat layer paint 2.

[0042] [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 mixing ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was 75 / 25.

[0043] [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 mixing ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was 50 / 50.

[0044] [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.

[0045] [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 30 / 70.

[0046] [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 mixing ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was 10 / 90.

[0047] [Production Example 8] A hard coat layer paint 8 was obtained in the same manner as in Production Example 1, except that urethane acrylate-based ultraviolet 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.

[0048] [Production Example 9] A hard coat layer paint 9 was obtained in the same manner as in Production Example 1, except that urethane acrylate-based ultraviolet 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.

[0049] [Reference Example] As a reference example, 100% butyl acetate used as a diluent solvent is shown.

[0050] [Table 1]

[0051] [Examples 1 to 13 and Comparative Examples 1 to 4] A base film and a hard coat layer paint were selected so as to have the combinations described in Table 2. On one side of each base film, each of the above hard coat layer paints was applied using a bar coater and dried by hot air in a drying oven at 80°C for 1 minute to form a coating layer with a coating film thickness of 2.5 μm. Using a UV irradiation device set at a height of 60 mm from the coated surface, it was cured at a UV irradiation dose of 250 mJ / cm 2 to form a hard coat layer, and hard coat films of Examples 1 to 13 and Comparative Examples 1 to 4 were obtained.

[0052] [Evaluation Method] The hard coat films of the above-mentioned respective examples and comparative examples obtained were evaluated according to the following criteria. The results are summarized in Table 1.

[0053] (1) Peak area ratio of radiation-curable resin 1 - 2 An infrared spectrum (infrared absorption spectrum) was measured by the ATR method for the radiation-curable resin in the uncured state using an infrared spectrophotometer. As the infrared spectrophotometer, FT-IR Spectrometer Spectrum 100 (manufactured by PerkinElmer Japan) was used.

[0054] As a measurement method, in 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 part (sensor part) of the infrared spectrophotometer, and IR measurement was performed immediately after dropping.

[0055] On the spectrum chart obtained with the horizontal axis as the wave number (cm -1 ) and the vertical axis as the absorbance, in the range of 3250 - 3500 cm -1, 1500 - 1580 cm -1 , 1650 - 1800 cm -1 A baseline was drawn at each of them, and the areas enclosed by this baseline and the spectral curve were designated as A, B, and C respectively. The ratios (A / C × 100) and (B / C × 100) were taken as the peak area ratios 1 - 2.

[0056] (2) Peak area ratio 3 of the hard coat layer Using an infrared spectrophotometer, an infrared spectrum (infrared absorption spectrum) was measured by the ATR method for the surface of the hard coat layer of the hard coat film. The infrared spectrophotometer used was FT - IR Spectrometer Spectrum 100 (manufactured by PerkinElmer Japan). On the obtained spectral chart with the horizontal axis as the wave number (cm⁻¹) and the vertical axis as the absorbance, baselines were drawn at 855 - 1325 cm⁻¹ and 1650 - 1800 cm⁻¹ respectively. The areas enclosed by this baseline and the spectral curve were designated as D and E respectively, and the ratio (D / E × 100) was taken as the peak area ratio 3.

[0057] (3) Adhesion The adhesion was evaluated by a cross - cut test in accordance with JIS - K5600 - 5 - 6. On the hard coat layer - forming surface of the hard coat film, using a cutter knife, 11 vertical and 11 horizontal cuts were made at 1 - mm intervals in a grid pattern to create a total of 100 - square grids. Adhesive tape No.252 manufactured by Sekisui Chemical Co., Ltd. was pasted on it, and after uniformly pressing it with a spatula, it was peeled off in the 60 - degree direction, and the remaining number of the hard coat layer was evaluated in four grades. The determination was made after performing the crimping and peeling five times at the same location. The evaluation criteria are as follows. Products evaluated as ◎ and ○ were judged to pass the adhesion, but products evaluated as △ were also acceptable in practical use.

[0058] Evaluation criteria ◎: 100 pieces ○: 99 - 90 pieces △: 89 - 50 pieces ×: 49 - 0 pieces

[0059] (4) Abrasion resistance For each hard coat film produced in the examples and comparative examples, in accordance with the test method specified in JIS-K5600-5-10, the hard coat layer surface was rubbed 10 times back and forth with steel wool #0000 under a load of 250 g / cm 2

[0060]

[0060] Evaluation Criteria ◎: No scratches. ○: 1 - 5 scratches occur. △: 6 - 10 scratches occur. ×: More than 10 scratches occur.

[0061]

Table 2

[0062] The notations of the base materials in Table 2 are 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.)

[0063] As is clear from the results in Table 2, according to the examples of the present invention, it is possible to provide a hard coat film that is excellent in the adhesion and durability of the hard coat layer even for a base material film with few polar groups and poor adhesion such as a cycloolefin film. On the other hand, according to the comparative examples, the adhesion is particularly poor.

Claims

1. A hard coat film having a hard coat layer containing an ionizing radiation curable resin provided on at least one side of a base film, wherein the base film is any one selected from a cycloolefin film, polyethylene terephthalate, and polyethylene naphthalate, the ionizing radiation curable resin contains a urethane acrylate resin containing a (meth)acryloyl group, and the ionizing radiation curable resin satisfies the following conditions (I) and (II), characterized in that it is a hard coat film. Condition (I): The peak area ratio 1 (A / C×100) is 5% or more (However, in the infrared spectroscopic measurement of the uncured radiation-curable resin, the peak area appearing at 3250 to 3500 cm －１ is defined as A, and the peak area appearing at 1650 to 1800 cm －１ is defined as C.) Condition (II): The peak area ratio 2 (B / C×100) is 5% or more (However, in the infrared spectroscopic measurement of the uncured radiation-curable resin, the peak area appearing at 1500 to 1580 cm －１ is defined as B, and the peak area appearing at 1650 to 1800 cm －１ is defined as C.)

2. The hard coat film according to claim 1, characterized in that the hard coat layer further satisfies the following condition (III). Condition (III): The peak area ratio 3 (D / E×100) is less than 400% (However, in the 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.)

3. The hard coat film according to claim 1 or 2, characterized in that the base film is a cycloolefin film.

4. The hard coat film according to any one of claims 1 to 3, characterized in that the evaluation of the adhesion by the following test method is an evaluation of "◎", "○", or "△". For the adhesion, a cross-cut peel test was performed according to JIS-K5600-5-6. Using a cutter knife, 11 vertical and 11 horizontal cuts were made at 1 mm intervals in a grid pattern on the hard coat layer forming surface of the hard coat film to form a total of 100 squares of a grid. Adhesive tape No. 252 manufactured by Sekisui Chemical Co., Ltd. was pasted thereon, and after uniformly pressing it with a spatula, it was peeled in the 60-degree direction, and the remaining number of the hard coat layer was evaluated in four grades. The determination was made after performing pressure bonding and peeling 5 times at the same location. The evaluation criteria are as follows. Evaluation Criteria ◎: 100 pieces ○: 99 - 90 pieces △: 89 - 50 pieces ×: 49 - 0 pieces

5. The hard coat film according to any one of claims 1 to 4, characterized in that the evaluation of the abrasion resistance by the following test method is an evaluation of "◎" or "○". Regarding the hard coat film, in accordance with the test method according to JIS-K5600-5-10, the hard coat layer surface was rubbed 10 times back and forth with a load of 250 g / cm using steel wool #0000, and the degree of scratching was evaluated according to the following criteria. ２ and the degree of scratching was evaluated according to the following criteria. Evaluation Criteria ◎: No scratches occur. ○: 1 - 5 scratches occur. △: 6 - 10 scratches occur. ×: 10 or more scratches occur.

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