JP2017177667A - Hard coat film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coat film excellent in temporal adhesiveness and durability under a normal condition and under a moisture heat resistant condition without an anchor layer to a substrate film such as a cycloolefin film or the like.SOLUTION: There is provided a hard coat film having a hard coat layer arranged on at least a single sided surface of a substrate film and the hard coat layer contains an electrolytic dissociation radioactive ray curable resin. A peak area ratio (A/B)×100 is 450% or more, where A is an area of a peak appeared in 855-1325 cmand B is an area of a peak appeared in 1650-1800 cmin an infrared spectroscopy spectrum measurement of the hard coat layer.SELECTED DRAWING: None

Description

  The present invention relates to a hard coat film, and more specifically, 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 buildings, automobiles, and train windows. The present invention relates to a hard coat film provided with a hard coat layer that can be used as a protective film such as glass.

  A display surface of a flood panel display such as a liquid crystal display device (LCD) is required to be provided with scratch resistance so that the surface is not damaged due to scratches during handling. Therefore, it is generally performed to impart scratch resistance 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 can input data and instructions by touching with a finger, pen, etc. while viewing the display on the display screen, functional requirements for hard coat film having optical visibility maintenance and scratch resistance are It is growing.

  Therefore, a cycloolefin film excellent in transparency, heat resistance, dimensional stability, low hygroscopicity, low birefringence, and optical isotropy as a base film is expected to be used for optical member applications. A hard coat layer is provided on a cycloolefin film. However, unlike an acrylic film or a polyester film, the cycloolefin 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.

  Therefore, conventionally, methods for imparting easy adhesion with a hard coat layer to a cycloolefin film are disclosed in Patent Document 1, Patent Document 2, and the like.

JP 2001-147304 A JP 2006-110875 A

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

  Patent Document 2 discloses that an anchor coating agent made of an olefin resin is coated on a cycloolefin film. This anchor coat treatment improves the adhesion between the cycloolefin film and the hard coat layer to some extent, but in the anchor coat layer where the coating film is flexible and stretched and the hard coat layer where the coating film is hard and does not stretch, There was a problem that cracks (film cracks, cracks, etc.) were likely to occur on the surface of the hard coat layer due to the difference in shrinkage of both coating films under the conditions (for example, stored in a dryer at a temperature of 100 ° C. for 5 minutes).

  Therefore, the present invention is a hard coat film provided with a hard coat layer on at least one surface of a base film having few polar groups and poor adhesion, such as a cycloolefin film. It aims at providing the hard coat film excellent in adhesiveness and durability.

As a result of intensive studies to solve the above-mentioned problems, the present inventors use a resin characterized by an infrared spectrum for the hard coat layer, so that there are few polar groups such as a cycloolefin film and the adhesiveness is poor. It has been found that the adhesion to the hard coat layer can be improved even with respect to the base film, and the present invention has been completed.
That is, the present invention has the following configuration.

1st invention is the hard coat film which provided the hard-coat layer in the at least single side | surface of the base film, Comprising: The said hard-coat layer contains ionizing-radiation-hardening-type resin, The infrared spectroscopy spectrum measurement of the said hard-coat layer in, the area of the peak appearing in 855～1325Cm ^-1 and a, when the B area of the peak appearing in 1650～1800Cm ^-1, the peak area ratio (a / B) × 100 is 450% or more It is the hard coat film characterized.

A second invention is a hard coat film in which a hard coat layer is provided on at least one surface of a base film, the hard coat layer containing an ionizing radiation curable resin, and infrared spectrum measurement of the hard coat layer , When the height of the highest peak appearing at 855 to 1325 cm ⁻¹ is C and the height of the highest peak appearing at 1650 to 1800 cm ⁻¹ is D, the peak height ratio (C / D) × 100 is It is a hard coat film characterized by being 100% or more.

  A third invention is the hard coat film according to the first or second invention, wherein the ionizing radiation curable resin contains an acrylic resin containing a (meth) acryloyl group.

  A fourth invention is a hard coat film according to any one of the first to third inventions, wherein the base film is a cycloolefin film.

  According to the present invention, with the above configuration, even a hard coat film provided with a hard coat layer on at least one side of a base film having few polar groups such as a cycloolefin film and having poor adhesion, the anchor layer is not interposed, It is possible to provide a hard coat film having excellent adhesion and durability over time under normal conditions and heat and humidity resistance conditions.

Hereinafter, embodiments for carrying out the present invention will be described in detail.
As described in the first invention, the present invention is a hard coat film in which a hard coat layer is provided on at least one surface of a base film, the hard coat layer containing an ionizing radiation curable resin, In the infrared spectroscopic measurement of the layer, when the area of the peak appearing at 855 to 1325 cm ⁻¹ is A and the area of the peak appearing at 1650 to 1800 cm ⁻¹ is B, the peak area ratio (A / B) × 100 is It is a hard coat film characterized by being 450% or more.

Further, the present invention is a hard coat film provided with a hard coat layer on at least one surface of a base film as in the second invention, wherein the hard coat layer contains an ionizing radiation curable resin, In the infrared spectrum measurement of the hard coat layer, when the height of the highest peak appearing at 855 to 1325 cm ⁻¹ is C and the height of the highest peak appearing at 1650 to 1800 cm ⁻¹ is D, the peak height The hard coat film is characterized in that the ratio (C / D) × 100 is 100% or more.
Hereinafter, each configuration will be described in detail.

[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, and examples thereof include polyethylene terephthalate, polyamide, polyethylene, polyimide, polypropylene, acrylic resin, polystyrene, cellulose acetate, polyvinyl chloride film or sheet. Can do. Among them, a cycloolefin film excellent in transparency, heat resistance, dimensional stability, low hygroscopicity, low birefringence, optical isotropy, and the like can be used. Specifically, cycloolefin units are polymerized alternately or randomly in the polymer skeleton and have an alicyclic structure in the molecular structure, and include norbornene compounds, monocyclic cyclic olefins, cyclic conjugated dienes and vinyl fatty acids. A cycloolefin copolymer film or a cycloolefin polymer film, which is a (co) polymer comprising at least one compound selected from cyclic hydrocarbons, is selected and used as appropriate.

  Moreover, in this invention, although the thickness of the said base film is suitably selected according to the use for which a hard coat film is used, it is the range of 10 micrometers-300 micrometers from viewpoints, such as mechanical strength and handling property. Preferably, it is in the range of 20 μm to 200 μm.

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

  In the present invention, when the base film is used for a hard coat film, the resin comprising the base film and a UV absorber is kneaded for the purpose of preventing deterioration of the coating film due to ultraviolet rays and adhesion failure. The film may be formed into a film, or a film in which a coating material in which a thermoplastic or thermosetting resin and an ultraviolet absorber are mixed is applied to one side or both sides of a base film may be used. As for the UV-cutting property, the transmittance at a wavelength of 380 nm as 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 can be used without particular limitation as long as it is a resin that forms a film, but particularly imparts the surface hardness (pencil hardness, scratch resistance) of the hard coat layer. Moreover, it is preferable to use an ionizing radiation curable resin in that the degree of crosslinking can be adjusted by the exposure amount of 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 is not particularly limited, but it is intended to include acrylic resins comprising (meth) acryloyl group represented by peaks in 1350～1390Cm ^-1 and 715～745Cm ^-1 in the infrared spectrum in the uncured state preferable. The hard coat layer containing the acrylic resin is easy to prepare so as to satisfy the range of the peak area ratio or peak height ratio of the present invention, which is preferable.

  Moreover, as resin contained in the said hard-coat layer, thermoplastic resins, such as polyethylene, a polypropylene, a polystyrene, a polycarbonate, polyester, an acryl, styrene-acryl, a fiber other than the above-mentioned ionizing radiation curable resin, phenol You may mix | blend thermosetting resins, such as resin, urea resin, unsaturated polyester, an epoxy, and a silicon resin, in the range which does not impair the hardness and abrasion resistance of a hard-coat layer.

  In addition, as a photopolymerization initiator of the ionizing radiation curable resin contained in the hard coat layer, acetophenones such as commercially available IRGACURE 651 and IRGACURE 184 (both trade names: manufactured by BASF), and IRGACURE 500 (product) Benzophenones such as (name: manufactured by BASF) can be used and are not particularly limited. However, in order to further improve the adhesion, it is preferable to use an organic peroxide such as diacyl peroxide.

  In the present invention, it is also possible to further improve the surface hardness (scratch resistance) by incorporating inorganic oxide fine particles into the hard coat layer. In this case, the average particle diameter 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, when the average particle diameter exceeds 50 nm, the gloss and transparency of the hard coat layer are lowered, and the flexibility may be lowered.

  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 a high hardness and can obtain an effect with a smaller amount of addition than silica.

  In this invention, it is preferable that content of the said inorganic oxide microparticles is 0.1-10.0 weight part with respect to 100 weight part of solid content of a hard-coat layer coating composition. When the content of the inorganic oxide fine particles is less than 0.1 parts by weight, it is difficult to obtain an effect of improving the surface hardness (abrasion resistance). On the other hand, if the content exceeds 10.0 parts by weight, the haze increases, which is not preferable.

Moreover, a leveling agent can be used for the purpose of improving the coatability in the hard coat layer. For example, a known leveling agent such as fluorine-based, acrylic-based, siloxane-based, or an adduct or mixture thereof can be used. It can be used. The blending amount can be in the range of 0.03 to 3.0 parts by weight with respect to 100 parts by weight of the solid content of the resin of the hard coat layer. In touch panel applications, etc., when adhesiveness using optical transparent resin OCR is required for the purpose of bonding with cover glass (CG), transparent conductive member (TSP), liquid crystal module (LCM), etc. of touch panel terminals. It is preferable to use an acrylic leveling agent or a fluorine leveling agent having a high surface free energy (approximately 40 mJ / cm ² or more).

  As other additives to be added to the hard coat layer, as long as the effects of the present invention are not impaired, an antifoaming agent, a surface tension adjusting agent, an antifouling agent, an antioxidant, an antistatic agent, an ultraviolet absorber, and a light stabilizer. You may mix | blend an agent etc. as needed.

  The hard coat layer is formed by coating and drying a coating material obtained by dissolving and dispersing a polymerization initiator and other additives in an appropriate solvent in addition to the ionizing radiation curable resin described above. Is done. The solvent can be appropriately selected depending on the solubility of the resin to be blended, and may be any solvent that can uniformly dissolve or disperse at least solids (resin, polymerization initiator, and other additives). 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. A known organic solvent such as an ester solvent such as butyl or methyl lactate, a ketone solvent such as acetone, methyl ethyl ketone, methyl isobutyl ketone, or cyclohexanone, or an alcohol solvent such as methanol, ethanol, isopropyl alcohol, or n-propyl alcohol. Or it can also be used in combination of several kinds as appropriate.

  The coating method of 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 method, spray coating method, 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 is difficult to obtain the required surface hardness. On the other hand, when the coating thickness exceeds 12.0 μm, curling is strongly generated, and handling properties are reduced in the manufacturing process and the like, which is not preferable. The coating thickness of the hard coat layer can be measured by actually measuring with a micrometer.

  In the present invention, a coating for hard coat layer containing the ionizing radiation curable resin is applied to a base film, dried, and then irradiated with UV or EB, whereby photopolymerization occurs and the coating has excellent hard properties ( Hard coat layer) can be obtained. In particular, a hard coat layer having a pencil hardness of B to 2H specified in JIS K5600-5-4 is preferable.

In the hard coat film of the present invention, the hard coat layer after the above-described curing has an area of a peak appearing at 855 to 1325 cm ⁻¹ in an infrared spectroscopic measurement, and B is an area of a peak appearing at 1650 to 1800 cm ^−1. It is important that the peak area ratio (A / B) × 100 is 450% or more, preferably 500% or more. The upper limit of the peak area ratio (A / B) is preferably 1500% or less. If the hard coat layer has a peak area ratio satisfying the range of the present invention, good adhesion and appearance can be obtained even for a base film having few polar groups such as a cycloolefin film and the hard coat layer is difficult to adhere. Can do.

The above hard coat layer, the height of the highest peaks appearing in 855～1325Cm ^-1 is C, the height of the highest peaks appearing in 1650～1800Cm ^-1 of is D, the peak height ratio (C / D) × 100 is preferably 100% or more, and more preferably 120% or more. The upper limit of the peak height ratio (C / D) is preferably 300% or less. If the hard coat layer has a peak height ratio satisfying the above range, it can obtain better adhesion and appearance for a base film having few polar groups such as a cycloolefin film and difficult to adhere to the hard coat layer. Can do.

The following reason is presumed that the effect of the present invention can be obtained when the hard coat layer of the present invention has the peak area ratio (A / B) or the peak height ratio (C / D). The
That is, after curing of the hard coat layer, the peak of the infrared spectroscopic spectrum appearing at 855 to 1325 cm ⁻¹ is the carbon-oxygen stretching vibration of the ether group or ester group, the carbon-hydrogen bending vibration of the carbonyl group, and the inorganic fine particles. It is derived from various structures such as silica skeleton and aluminum oxide skeleton. Moreover, the peak of the infrared spectrum which appears in 1650-1800 cm < ^-1 > shows the carbon-carbon double bond of an acryloyl group. That is, the adhesion of the hard coat layer to the base material due to the acryloyl group by including a structure showing an infrared spectrum spectrum peak appearing at 855 to 1325 cm ⁻¹ of a certain ratio or more with respect to the existing ratio of the acryloyl group, Since the hard coat layer is cured and shrunk in the layer, the balance between the interface of the base film and the peeling force that is peeled off in a different direction is maintained, so that the present invention can be applied to cycloolefin films with few polar groups. It is thought that an effect can be obtained.

As described above, the hard coat film of the present invention uses a resin having a characteristic infrared spectrum for the hard coat layer, so that the base film having few polar groups such as cycloolefin film and poor adhesion is used. However, excellent adhesion with the hard coat layer can be ensured. That is, according to the present invention, in the infrared spectrum measurement of the hard coat layer, the peak area appearing at 855 to 1325 cm ⁻¹ is A, and the peak area appearing at 1650 to 1800 cm ⁻¹ is B. When the area ratio (A / B) × 100 is 450% or more, even with respect to the base film having few polar groups such as cycloolefin film and poor adhesion to the hard coat layer, the anchor layer is not interposed, It is possible to provide a hard coat film having excellent adhesion and durability over time under normal conditions and heat and humidity resistance conditions.

Further, the hard coat film of the present invention, in the infrared spectrum measured in the hard coat layer, the height of the highest peaks appearing in 855～1325Cm ^-1 is C, the highest peaks appearing in 1650～1800Cm ^-1 When the height is D, the peak height ratio (C / D) × 100 is preferably 100% or more in order to further improve the effect of the present invention.

EXAMPLES Hereinafter, although an Example is given and this invention is explained in full detail, this invention is not limited to a following example. In addition, a comparative example will be described.
Unless otherwise specified, “%” described below represents “% by weight”.

[Example 1]
Urethane acrylate UV curable resin composition “TOMAX FA-3246” (solid content: 40%, manufactured by Nippon Kako Paint Co., Ltd.), and Irgacure 184 (photopolymerization initiator, manufactured by BASF Corp.) as a solid resin composition A hard coat layer coating was prepared by diluting 3 parts by weight with butyl acetate until the solid content in the UV curable resin coating was 30% and stirring sufficiently.
The hard coat layer paint is applied to one side of ZEONOR film “ZF14” (manufactured by Nippon Zeon Co., Ltd.) as a cycloolefin film using a bar coater and dried with hot air in an oven at 80 ° C. for 1 minute. A coating layer having a film thickness of 5.0 μm was formed. This was cured by using a UV irradiation apparatus set at a height of 60 mm from the coated surface at a UV irradiation amount of 250 mJ / cm ² to form a hard coat layer, thereby producing a hard coat film of this example.

[Example 2]
The urethane acrylate-based ultraviolet curable resin composition “TOMAX FA-3246” (solid content 40%, manufactured by Nippon Kako Paint Co., Ltd.) and the urethane acrylate-based ultraviolet curable resin “Art Resin UN-904” (solid content 100%, (Meth) acryloyloxy group number: 10, manufactured by Negami Kogyo Co., Ltd.), TOMAX FA-3246 and UN-904 are blended so that the solid content blending ratio (parts by weight) is 80/20, and butyl acetate The hard coat layer coating material was prepared by diluting until the solid content concentration in the coating material of the ultraviolet curable resin was 30% and stirring sufficiently. Otherwise, a hard coat film was obtained in the same manner as in Example 1.

[Example 3]
A hard coat film was obtained in the same manner as in Example 2 except that the solid content ratio (parts by weight) of TOMAX FA-3246 and UN-904 in Example 2 was changed to 50/50.

[Example 4]
A hard coat film was obtained in the same manner as in Example 2 except that the solid content ratio (parts by weight) of TOMAX FA-3246 and UN-904 in Example 2 was changed to 30/70.

[Example 5]
A hard coat film was obtained in the same manner as in Example 2 except that the solid content ratio (parts by weight) of TOMAX FA-3246 and UN-904 in Example 2 was 20/80.

[Comparative Example 1]
A hard coat film was obtained in the same manner as in Example 2 except that the solid content ratio (parts by weight) of TOMAX FA-3246 and UN-904 in Example 2 was changed to 10/90.

[Comparative Example 2]
A hard coat film was obtained in the same manner as in Example 2 except that the solid content ratio (parts by weight) of TOMAX FA-3246 and UN-904 in Example 2 was changed to 5/95.

[Comparative Example 3]
A hard coat film was obtained in the same manner as in Example 2 except that the solid content ratio (parts by weight) of TOMAX FA-3246 and UN-904 in Example 2 was changed to 0/100 (that is, UN-904 alone was used). .

[Comparative Example 4]
Instead of “TOMAX FA-3246” used in the hard coat layer of Example 1, urethane acrylate ultraviolet curable resin “A-9550” (solid content: 100%, (meth) acryloyloxy group number: 6, Shin Nakamura Chemical Co., Ltd.) A hard coat film was obtained in the same manner as in Example 1 except that the product manufactured by KK was used.

[Comparative Example 5]
Instead of “TOMAX FA-3246” used in the hard coat layer of Example 1, urethane acrylate-based ultraviolet curable resin “Ebecryl 4858” (solid content: 100%, (meth) acryloyloxy group number: 2, Daicel Ornex Co., Ltd.) A hard coat film was obtained in the same manner as in Example 1 except for using

<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 and peak height ratio An infrared spectrum (infrared absorption spectrum) was measured by an ATR method on the hard coat layer surface of the hard coat film using an infrared spectrophotometer. As the infrared spectrophotometer, FT-IR Spectrometer Spectrum 100 (manufactured by PerkinElmer Japan) was used. On the obtained spectrum chart where the horizontal axis is the wave number (cm ⁻¹ ) and the vertical axis is the absorbance, a baseline is drawn to 855 to 1325 cm ⁻¹ and 1650 to 1800 cm ⁻¹ , respectively. The areas surrounded by A are B and A, respectively, and the ratio (A / B) × 100 is the peak area ratio. The height of the highest peak appearing at 855 to 1325 cm ⁻¹ is C, the height of the highest peak appearing at 1650 to 1800 cm ⁻¹ is D, and the ratio (C / D) × 100 is the peak height ratio. did.

(2) Adhesiveness Adhesiveness performed the cross-cut peeling test according to JIS-K5600-5-6. Using a cutter knife on the hard coat layer forming surface of the hard coat film in an environment of 25 ° C. and 50% RH, 11 vertical and 11 horizontal cuts were made at 1 mm intervals in a grid pattern to make a total of 100 squares. Cut square squares, and stick Sekisui Chemical Co., Ltd. Adhesive Tape No. 252 on it, press it evenly with a spatula, and peel it off in the direction of 60 degrees. evaluated. Judgment was made after crimping and peeling five times at the same location. The evaluation criteria are as follows, and ◎ and ○ evaluated products were judged to have passed adhesion, but Δ evaluated products are also practical.
Evaluation criteria ◎: 100 pieces ○: 99 to 95 pieces △: 94 to 50 pieces ×: 49 to 0 pieces

(3) Scratch resistance About each hard coat film produced by the Example and the comparative example, by the test method according to JIS-K5600-5-10, the load of 1 kg was applied to the hard coat layer surface using steel wool # 0000. 10 times reciprocating friction was applied, and the degree of scratching was evaluated according to the following criteria. ○ Although the evaluation product has good scratch resistance, the evaluation product can also be used as a product.
Evaluation criteria ○: No scratches occurred. Δ: Some scratches occur. X: Innumerable scratches occur.

(4) Pencil hardness About the hard coat film produced by each Example and the comparative example, pencil hardness was measured by the test method according to JISK5600-5-4. The hardness that does not cause scratches on the surface is indicated.

(5) Appearance over time After each hard coat film produced in Examples and Comparative Examples is left for 100 hours in an environment of 80 ° C. and 90% RH, poor adhesion (film peeling, etc.) and generation of cracks occur. The presence or absence of such was evaluated visually. The evaluation criteria are as follows.
○: No change before and after the test and excellent in appearance.
Δ: Some peeling of the film is observed at the end of the hard coat film, but the overall appearance is good.
X: Film peeling was observed over the entire surface, and the appearance was poor.

  As is apparent from the results in Table 1, according to the examples of the present invention, in the infrared spectroscopic spectrum measurement of the hard coat layer, the peak area ratio is 450% or more, so that a substrate such as a cycloolefin film is obtained. A hard coat film excellent in adhesion and durability over time under normal conditions and heat and humidity resistance conditions was obtained for the film. In addition, when the peak height ratio is 100% or more, similarly, the substrate film such as a cycloolefin film is excellent in adhesion and durability over time under normal conditions and moist heat resistance conditions. A hard coat film was obtained.

In contrast, in the infrared spectroscopic measurement of the hard coat layer, the peak area ratio is less than 450%, or the hard coat film of the comparative example in which the peak height ratio is less than 100%, the cycloolefin film The adhesion of the hard coat layer to the substrate film such as is not improved.
From the above, the excellent effect of the present invention is clear.

Claims (4)

A hard coat film provided with a hard coat layer on at least one side of a base film,
The hard coat layer contains an ionizing radiation curable resin,
In infrared spectrum measurement of the hard coat layer, and the area of the peak appearing in 855～1325Cm ^-1 and A, when the B area of the peak appearing in 1650～1800Cm ^-1, the peak area ratio (A / B) A hard coat film, wherein x100 is 450% or more. A hard coat film provided with a hard coat layer on at least one side of a base film,
The hard coat layer contains an ionizing radiation curable resin,
In the infrared spectrum measurement of the hard coat layer, when the height of the highest peak appearing at 855 to 1325 cm ⁻¹ is C and the height of the highest peak appearing at 1650 to 1800 cm ⁻¹ is D, the peak height A hard coat film having a thickness ratio (C / D) × 100 of 100% or more.   The hard coat film according to claim 1, wherein the ionizing radiation curable resin includes an acrylic resin containing a (meth) acryloyl group.   The hard coat film according to claim 1, wherein the base film is a cycloolefin film.