TW201920527A - Hard coat film - Google Patents

Abstract

The purpose of the present invention is to provide a hard coat film which shows excellent temporal adhesion and high durability of a hard coat layer both under normal conditions and hot and humid conditions, even in the case of bonding to a base film having few polar groups and showing poor adhesion, for example, a cycloolefin film. The hard coat film according to the present invention, wherein a hard coat layer comprising an ionizing radiation curable resin is formed on at least one face of a base film, is characterized in that the ionizing radiation curable resin satisfies requirement (I). Requirement (I): peak area ratio 1 ((A/C)*100) is 5% or greater (wherein: A represents a peak area appearing within 3250-3500 cm-1 in infrared spectrometric measurement of the ionizing radiation curable resin in an uncured state; and C represents a peak area appearing within 1650-1800 cm-1 therein).

Description

Hard-coated film

The present invention relates to a hard coating film, and more specifically, to a hard coating film provided with a hard coating layer, which can be used as a liquid crystal display device, a plasma display device, and an electroluminescence (EL) display device. Such as flat panel displays, touch panel and other display device parts, as well as the protective film of the window glass of buildings, cars, trams, etc.

It is required for a display surface of a flat panel display such as a liquid crystal display (LCD, Liquid Crystal Display) to be provided with abrasion resistance so as not to be damaged during operation and to reduce visibility. Therefore, a hard coat film provided with a hard coat layer on a base film is generally used to impart scratch resistance. In recent years, since a touch panel capable of inputting data or instructions by touching with a finger or a pen while viewing and displaying on a display screen has become popular, hard-coated films having optical visibility and scratch resistance are maintained. The functional requirements continue to increase.

Therefore, polyethylene terephthalate films, polyethylene naphthalate, and cycloolefin films which are excellent in transparency, heat resistance, dimensional stability, and low hygroscopicity as substrate films are expected to be used in optical members. In particular, cycloolefin films having low birefringence and excellent optical isotropy are highly expected for applications. A hard coat layer is provided on such a base film in order to further impart rigidity. However, since such a base film has a small number of polar groups on the surface of the film, there is a problem that the adhesion between the base film and the hard coating layer is poor.

Therefore, there is known a method for imparting an easy adhesion to a hard coat layer to such a base film in Patent Literature 1, Patent Literature 2, and the like.

[Prior technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2001-147304

[Patent Document 2] Japanese Patent Laid-Open No. 2006-110875

Conventionally, as a method for imparting an easy adhesion to a hard coat layer to a cycloolefin film, Patent Document 1 discloses a corona treatment, a plasma treatment, a UV (Ultraviolet) treatment, and the like. There is a problem that the adhesion between the cyclic olefin film and the hard coating layer is insufficient, and the problem of poor adhesion over time is particularly easy to occur.

In addition, Patent Document 2 discloses that a fixed coating agent containing an olefin-based resin is applied to a cycloolefin film. Through the fixed coating treatment, the adhesion between the cycloolefin film and the hard coating layer can be improved to a certain extent, but the fixed coating layer with a soft and extensible coating film and the hard coating layer with a hard and non-extensible coating film can be improved. However, due to the poor shrinkage of the two coating films under heat-resistant conditions (for example, storage in a dryer at a temperature of 100 ° C for 5 minutes), there is a problem that cracks (film cracking, cracking, etc.) are easily generated on the surface of the hard coating layer.

Therefore, an object of the present invention is to provide a base film having a small number of polar groups and poor adhesion, such as a cycloolefin film, under normal conditions, and under a hot and humid condition, the adhesion and durability of the hard coating layer over time. Hard coated film with excellent properties.

The inventors of the present invention have made intensive studies in order to solve the above-mentioned problems. It was found that by using a resin having characteristics in the infrared spectroscopic spectrum for a hard coating layer, even for a substrate film with less polar groups such as cycloolefin films and poor adhesion, the adhesion with the hard coating layer can be improved. And thus complete the present invention.

That is, the present invention has the following constitutions.

(1) A hard coating film, which is provided on at least one side of a base film with a hard coating layer containing a free radiation-curable resin, characterized in that the free radiation-curable resin satisfies the following condition (I): Condition (I): Peak area ratio 1 (A / C × 100) is 5% or more

(Among them, in the infrared spectroscopic measurement of the non-hardened free radiation hardening resin, the peak area appearing in 3250 ~ 3500cm ^-1 is set to A, and the peak area appearing in 1650 ~ 1800cm ^-1 is set to C) .

(2) The hard-coated film according to (1), wherein the above-mentioned free radiation-curable resin further satisfies the following condition (II): condition (II): the peak area ratio 2 (B / C × 100) is 5% or more

(Among them, in the infrared spectroscopic measurement of the non-hardened free radiation hardening resin, the peak area appearing in 1500 to 1580 cm ^-1 is set to B, and the peak area appearing in 1650 to 1800 cm ^-1 is set to 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) Less than 400%

(Among them, in the infrared spectroscopic measurement of the hard coating after hardening, a peak area appearing in 855 to 1325 cm ^-1 is set to D, and a peak area appearing in 1650 to 1800 cm ^-1 is set to E).

(4) The hard-coated film according to any one of (1) to (3), wherein the above-mentioned free radiation The curable resin includes an acrylic resin containing a (meth) acrylfluorenyl group.

(5) The hard-coated film according to any one of (1) to (4), wherein the base film is selected from a cycloolefin film, polyethylene terephthalate, and polyethylene naphthalate Either of them.

According to the present invention, it is possible to provide a base film having a small number of polar groups, such as a cycloolefin film, and having poor adhesion. Under normal conditions and under a hot and humid condition, the adhesion and durability of the hard coating layer over time can be provided. Excellent hard-coated film.

Hereinafter, the form for implementing this invention is described in detail.

The present invention is a hard-coated film, which is provided on at least one side of a substrate film with a hard-coat layer containing a free radiation-curable resin, and is characterized in that the free radiation-curable resin satisfies the following condition (I): Condition (I): Peak area ratio 1 (A / C × 100) is 5% or more

(Among them, in the infrared spectroscopic measurement of the non-hardened free radiation hardening resin, the peak area appearing in 3250 ~ 3500cm ^-1 is set to A, and the peak area appearing in 1650 ~ 1800cm ^-1 is set to C) .

[Substrate film]

First, the base film of a hard-coat film is demonstrated.

In the present invention, the base film of the hard coating film is not particularly limited, and examples thereof include polyethylene terephthalate, polyimide, polyethylene, polyimide, and polyimide. Film-free sheet of acrylic, acrylic resin, polystyrene, cellulose acetate, polyvinyl chloride, etc. Among them, it is preferable to use polyethylene terephthalate, polyethylene naphthalate, and cyclic olefin films which are excellent in transparency, heat resistance, dimensional stability, and low hygroscopicity. Excellent birefringence and optical isotropy.

The so-called cyclic olefin film refers to those in which the cyclic olefin units are polymerized alternately or randomly in the polymer skeleton and have an alicyclic structure in the molecular structure. A cyclic olefin copolymer film or a cyclic olefin polymer film of a (co) polymer made of at least one of an olefinic compound, a monocyclic cyclic olefin, a cyclic conjugated diene, and an ethylene alicyclic hydrocarbon. , You can choose any one to use.

In the present invention, the thickness of the substrate film is appropriately selected depending on the application of the hard-coated film to be used. From the viewpoints of mechanical strength and operability, it is preferably in a range of 10 μm to 300 μm, and more preferably The range is 20 μm to 200 μm.

In the present invention, regarding the heat resistance of the above-mentioned base film, when it is used for a hard-coated film, it is preferable to use a film having a glass transition temperature of about 120 ° C to 170 ° C. The glass transition temperature is determined by The sample is measured by a thermogravimetry (TG, Thermogravimetry) method or a differential scanning calorimeter (DSC) method, which measures the thermal change when a temperature change is applied to the sample.

In the present invention, when the substrate film is used for a hard-coated film, in order to prevent deterioration of the coating film caused by ultraviolet rays and poor adhesion, the resin and the ultraviolet absorber constituting the substrate film may be mixed. Resin is formed into a thin film; or a film coated on one or both sides of a base film with a coating mixed with a thermoplastic or thermosetting resin and an ultraviolet absorber. As for the ultraviolet cutoff property, it is preferable that the transmittance at a wavelength of 380 nm using a spectrophotometer is 10% or less. It is more preferably 7% or less.

[Hard Coating]

Next, the hard coat layer will be described.

In the present invention, as the resin contained in the hard coat layer, as long as it is a resin for forming a film, it can be used without particular limitation, and in particular, it imparts surface hardness (pencil hardness, abrasion resistance) to the hard coat layer, Or, the degree of cross-linking can be adjusted by the exposure amount of ultraviolet rays, and the surface hardness of the hard coat layer can be adjusted, preferably using a radiation-hardenable resin.

The free radiation-curable resin used in the present invention is a transparent resin hardened by irradiation with ultraviolet rays (hereinafter, simply referred to as "UV") or electron beam (hereinafter, simply referred to as "EB"), and preferably contains ( In the case of a meth) acrylfluorene-based acrylic resin, an acrylic urethane resin containing a (meth) acrylfluorene group is more preferred.

Regarding the free radiation-hardening resin used in the present invention, in the infrared spectroscopic measurement of the unhardened state, the area of the peak range appearing in 3250 ~ 3500cm ^-1 is set to A, and it will be in 1500 ~ 1580cm ^-1 When the area of the peak range that appears is B, and the area of the peak range that appears within 1650 ~ 1800cm ^-1 is C, it is important that the condition (I): the peak area ratio 1 (A / C × 100) is 5 % Or more, preferably 10% or more.

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

It is presumed that in the free radiation-curable resin, the peak system appearing within 1650 to 1800 cm ^-1 represents a carbon-carbon double bond of acrylfluorenyl group. The peaks appearing within 3250 ~ 3500cm ^-1 represent nitrogen-hydrogen bonds derived from amidino groups, or oxygen-hydrogen bonds derived from hydroxyl groups. That is, by having a ratio of acryl based on the presence of acryl based on a certain ratio, peaks appearing within 3250 to 3500 cm ^-1 can maintain the adhesion of the hard coating layer to the base with acryl based and hard coating. The balance of the peeling force when the layer hardens and shrinks in the layer and is peeled off by applying a force in a direction different from the interface of the substrate film. Therefore, it is estimated that even for a cycloolefin film with fewer polar groups, it is not necessary to fix the layer or substrate The film is modified, and the adhesion to the substrate film is significantly improved.

Further, the peak system appearing within 1500 to 1580 cm ^-1 indicates a nitrogen-hydrogen bond derived from amidino group, a carbon-hydrogen bond derived from a phenyl ring, or a nitrogen-nitrogen double bond derived from an azo group. In the same manner as above, it is presumed that by having a ratio of the presence of acryl fluorenyl group, a peak appearing in a range of 1500 to 1580 cm ^-1 at a certain ratio or more, the adhesiveness to the base film can be significantly improved.

In addition, as the resin contained in the hard coat layer, in addition to the above-mentioned specific radiation-hardening resin having an IR (Infrared Radiation) peak, the effect of the present invention or the hardness of the hard coat layer, Thermoplastic resins such as polyethylene, polypropylene, polystyrene, polycarbonate, polyester, acrylic, styrene-acrylic, cellulose, etc., or phenol resin, urea resin, unsaturated polyester, ring Thermosetting resins such as oxygen resins and silicone resins.

As the photopolymerization initiator for the free radiation-curable resin contained in the hard coat layer, commercially available acetophenones such as IRGACURE 651 or IRGACURE 184 (both are trade names: manufactured by BASF), and IRGACURE can be used. There are no particular restrictions on benzophenones such as 500 (trade name: manufactured by BASF). However, in order to further improve the adhesion, it is preferable to use organic peroxides such as dioxinyl peroxides.

In the present invention, it is also possible to further improve the surface hardness (scratch resistance) by including the inorganic oxide fine particles in 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, and more preferably the average particle diameter. The particle size ranges from 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.

In the present invention, examples of the inorganic oxide fine particles include alumina and silicon dioxide. Among these, alumina containing aluminum as a main component has high hardness, and therefore, it can obtain an effect with a smaller amount of addition than silicon dioxide, so it is particularly preferable.

In the present invention, the content of the inorganic oxide fine particles is preferably 0.1 to 10.0 parts by weight relative to 100 parts by weight of the solid content of the hard coat 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.

In order to improve coatability, a leveling agent may be used in the hard coat layer, and for example, a known leveling agent such as a fluorine-based, acrylic-based, siloxane-based adduct, or a mixture thereof may be used. Regarding the blending amount, it can be blended in a range of 0.03 parts by weight to 3.0 parts by weight with respect to 100 parts by weight of the solid content of the hard coat resin. In addition, in touch panel applications, etc., it is required to be used in order to connect with touch panel terminals (CG, Cover Glass), transparent conductive members (TSP), and liquid crystal modules (LCM, Liquid Crystal Module). The relative adhesiveness of OCR (Optical Clear Resin). In this case, it is preferable to use an acrylic leveling agent or a fluorine leveling agent with a high surface free energy (about 40 mJ / cm ² or more).

As other additives to be added to the above-mentioned hard coating layer, it is also possible to blend antifoaming agents, surface tension adjusting agents, antifouling agents, antioxidants, antistatic agents, and ultraviolet absorption within the range that does not impair the effects of the present invention. Agents, light stabilizers, etc.

The hard coat layer will be in addition to the above-mentioned free radiation-curable resin. A coating material obtained by dissolving and dispersing a polymerization initiator, other additives, and the like in an appropriate solvent is applied to the substrate film and dried to form it. The solvent may be appropriately selected depending on the solubility of the above-mentioned resin to be formulated, and any solvent may be used as long as it can dissolve or disperse the solid content (resin, polymerization initiator, and other additives) uniformly. Examples of such solvents include aromatic solvents such as toluene, xylene, and n-heptane; aliphatic solvents such as cyclohexane, methylcyclohexane, and ethylcyclohexane; methyl acetate and ethyl acetate Esters, propyl acetate, isopropyl acetate, butyl acetate, methyl lactate and other ester solvents; acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone and other ketone solvents; methanol, ethanol, Well-known organic solvents, such as an alcohol-based solvent, such as isopropyl alcohol and n-propanol, are used individually or in combination of several types suitably.

There is no particular limitation on the coating method of the hard coat layer described above. Gravure coating, micro gravure coating, spray bar coating, sliding coating, slit die coating, screen printing, spray coating After the coating is performed by a known coating method such as a method, it is usually dried at a temperature of about 50 to 120 ° C.

The thickness of the coating film of the hard coat layer is not particularly limited, and it is preferably in a range of 1.0 μm to 12.0 μm, for example. If the thickness of the coating film is less than 1.0 μm, it is difficult to obtain the required surface hardness. In addition, when the thickness of the coating film exceeds 12.0 μm, strong curling occurs, which reduces workability during manufacturing steps and the like, which is not preferable. In addition, the thickness of the coating film of the hard coat layer can be measured by actual measurement using a micrometer.

In the present invention, photopolymerization can be caused by applying the above-mentioned coating material for a hard coat layer containing a free radiation-curable resin to a substrate film, drying it, and then irradiating UV or EB (Electron-beam, electron beam). A coating film (hard coat layer) having excellent rigidity is obtained. Particularly preferred is a hard coating having a pencil hardness B ~ 2H as specified in JIS K5600-5-4.

Regarding the hard-coated film of the present invention, it is preferable that the area of the peak appearing in 855 to 1325 cm ^-1 be set to D in the infrared spectroscopic measurement of the hardened hard coating layer described above, and that it be in 1650 to 1800 cm ^-1 When the area of the peak to appear is set to E, the peak area ratio 3 (D / E × 100) is less than 400%, and more preferably 380% or less. The lower limit of the peak area ratio 3 is preferably 300% or more. With a hard coat layer having a peak area ratio of 3 that satisfies the range of the present invention, good adhesion can be obtained even for a base film having a small number of polar groups such as a cycloolefin film or a polyimide film and difficult to adhere to the hard coat layer. Sex and appearance.

It is assumed that the peaks of the infrared spectroscopic spectrum appearing in the hardened coating after 1650 to 1800 cm ^-1 are the same as the peaks appearing in the above-mentioned free radiation-curable resin.

In the present invention, in the hardened hard coating layer, the peaks of the infrared spectroscopic spectrum appearing in 855 to 1325 cm ^-1 are derived from the carbon-oxygen stretching vibration of the ether group or the ester group, and the carbon-hydrogen of the carbonyl group. Bending vibration and various structures such as silica framework and alumina framework as inorganic fine particles. It is estimated that the ratio of the presence of acryl fluorenyl group to a peak that appears within 855 to 1325 cm ^-1 below a certain ratio can achieve a balance with the adhesion to the base film.

[Example]

Hereinafter, the present invention will be specifically described with examples, but the present invention is not limited to the following examples. At the same time, a comparative example will be described.

In addition, unless otherwise stated, "%" described below means "weight%".

[Manufacturing example 1]

Based on acrylic urethane-based UV-curable resin "TOMAX FA-3312-2" (40% solid content, manufactured by Japan Chemical Coatings Co., Ltd.) The agent was diluted with butyl acetate until the solid content concentration in the coating of the ultraviolet curable resin became 30%, and was sufficiently stirred to prepare a hard coat coating 1.

[Manufacturing example 2]

The above-mentioned acrylic urethane-based ultraviolet curable resin "TOMAX FA-3312-2" (40% solid content, manufactured by Japan Chemical Coatings Co., Ltd.) and the acrylic urethane-based ultraviolet curable resin "A- 9550 "(100% solids content, manufactured by Shin Nakamura Chemical Co., Ltd.) as the main agent, and the blending ratio of the solid content of TOMAX FA-3312-2 and A-9550 is 80/20. The hard coating paint 2 was prepared by diluting until the solid content concentration in the coating of the ultraviolet curable resin became 30%, and stirring sufficiently.

[Manufacturing example 3]

Except that the solid content ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was set to 75/25, a hard coat coating material 3 was obtained in the same manner as in Production Example 2.

[Manufacturing example 4]

A hard coat coating material 4 was obtained in the same manner as in Production Example 2 except that the solid content ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was set to 50/50.

[Manufacturing example 5]

Except that TOMAX FA-3312-2 of Production Example 1 was set to TOMAX FA-3312-4, a hard coat coating material 5 was obtained in the same manner as in Production Example 1.

[Manufacturing example 6]

Except that the solid content ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was set to 30/70, a hard coat coating material 6 was obtained in the same manner as in Production Example 2.

[Manufacturing example 7]

A hard coat coating material 7 was obtained in the same manner as in Production Example 2 except that the solid content ratio of TOMAX FA-3312-2 and A-9550 in Production Example 2 was set to 10/90.

[Manufacturing example 8]

Acrylic urethane-based 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 of Production Example 1. Except for this, a hard coat paint 8 was obtained in the same manner as in Production Example 1.

[Production Example 9]

Acrylic urethane-based UV-curable resin "BS-575CSB" (100% solid content, manufactured by Arakawa Chemical Industries, Ltd.) was used instead of "TOMAX FA-3312-2" used in the hard coat layer of Production Example 1. Except for this, a hard coat paint 9 was obtained in the same manner as in Production Example 1.

[Reference example]

As a reference example, butyl acetate used as a dilution solvent showed 100%.

<Examples 1 to 13 and Comparative Examples 1 to 4>

The substrate film and the hard coat coating are selected so as to form a combination described in Table 2. Each of the substrate films is coated with one hard coater using a hard coater, and heated in a drying oven at 80 ° C for 1 minute. Dry to form a coating with a thickness of 2.5 μm. Using a UV irradiation device installed at a height of 60 mm from the coating surface, it was hardened at a UV irradiation amount 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.

<Evaluation method>

The obtained hard-coated films of the above Examples and Comparative Examples were evaluated on the basis of the following criteria. The results are summarized in Table 1.

(1) Peak area ratio of free radiation hardening resin 1 ~ 2

An infrared spectrophotometer was used to measure an infrared spectroscopic spectrum (infrared absorption spectrum) by an ATR (Attenuated Total Reflectance) method for a non-hardened free radiation curable resin. As the infrared spectrophotometer, an FT-IR (Fourier Transform Infrared Radiation) spectrometer Spectrum 100 (manufactured by PerkinElmer Japan) was used.

As a measuring method, a 10 μm hard coat coating or a reference example of butyl acetate was added dropwise to a measurement portion (sensor portion) of an infrared spectrophotometer under a temperature of 23 ° C. and a humidity of 50%. An IR measurement was performed.

Draw the reference lines on the obtained spectrum with the horizontal axis as the wave number (cm ^-1 ) and the vertical axis as the absorbance, at 3250 ~ 3500cm ^-1 , 1500 ~ 1580cm ^-1 , 1650 ~ 1800 cm ^-1 Let the areas enclosed by the reference line and the spectral curve be A, B, and C, respectively, and set their ratios (A / C × 100) and (B / C × 100) to the peak area ratios 1-2.

(2) Peak area ratio of hard coating 3

An infrared spectrophotometer was used to measure the infrared spectroscopic spectrum (infrared absorption spectrum) by the ATR method on the hard-coated surface of the hard-coated film. As the infrared spectrophotometer, an FT-IR spectrometer Spectrum100 (manufactured by PerkinElmer Japan) was used. On the obtained spectrum graphs with the horizontal axis as the wave number (cm ^-1 ) and the vertical axis as the absorbance, draw reference lines at 855 ~ 1325cm ^-1 and 1650 ~ 1800cm ^-1 respectively. The areas enclosed by the curves are respectively D and E, and the ratio (D / E × 100) is set to the peak area ratio 3.

(3) Adhesiveness

Adhesion is based on a tessellation peel test based on JIS-K5600-5-6. Use a cutting knife to form a checkerboard pattern on the hard coating of the hard-coated film. Cut out 11 vertical and horizontal 11 cuts at 1mm intervals and engraved a total of 100 square nets. This will limit Sekisui Chemical Industry Co., Ltd. Adhesive tape No.252 made by the company was attached to it, and it was evenly pressed with a spatula, and then peeled off at 60 degrees, and the remaining number of the hard coating layer was evaluated in four stages. After 5 times of crimping and peeling at the same location, the judgment was made. The evaluation criteria are as follows. The ◎ and 评价 evaluations were judged to be satisfactory in adhesion, but the △ evaluations could also be used practically.

Evaluation benchmark

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

(4) Scratch resistance

For each hard-coated film produced in the examples and comparative examples, a load of 250 g / cm ² was applied to the hard-coated surface by steel wool # 0000 by a test method based on JIS-K5600-5-10, and performed 10 times. Friction was evaluated based on the following criteria. The ○ evaluation product was evaluated as being excellent in abrasion resistance, but the Δ evaluation product was used as a product.

Evaluation benchmark

：: No abrasion occurred. ○: 1 to 5 scratches occurred. △: 6 to 10 scratches occurred. ×: 10 or more abrasions occurred.

The notation of the base material in Table 2 is as follows.

ZF16: Cycloolefin film (thickness: 100 μm, manufactured by Japan Zeon Corporation)

A4300: Polybutylene terephthalate film (thickness 100 μm, manufactured by Toyo Textile Co., Ltd.)

Q65HW: Polyethylene naphthalate film (thickness 100 μm, manufactured by Teijin Film Solutions Co., Ltd.)

From the results in Table 2, it is clear that, according to the embodiment of the present invention, a hard coating having excellent adhesion and durability can be provided for a base film having few polar groups such as a cycloolefin film and having poor adhesion. film. On the other hand, if it is a comparative example, its adhesiveness is especially inferior.

Claims (5)

A hard coating film, which is provided on at least one side of a substrate film with a hard coating layer containing a free radiation-curable resin, characterized in that the free radiation-curable resin satisfies the following condition (I): condition ( I): The peak area ratio 1 (A / C × 100) is 5% or more (wherein, the peak area that will appear within 3250 to 3500 cm ^-1 in the infrared spectroscopic measurement of the uncured free radiation-curable resin is set as A, the area of the peak appearing in 1650 ~ 1800cm ^-1 is set as C). The hard-coated film according to claim 1, wherein the above-mentioned free radiation-curable resin further satisfies the following condition (II): condition (II): the peak area ratio 2 (B / C × 100) is 5% or more (wherein the In the infrared spectroscopic measurement of the non-hardened free radiation hardening resin, the peak area appearing within 1500 to 1580 cm ^-1 is set as B, and the peak area appearing between 1650 and 1800 cm ^-1 is set to C). For example, the hard-coated film of claim 1 or 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% (wherein the In the infrared spectroscopic measurement of the hardened hard coating layer, the peak area appearing in 855 to 1325 cm ^-1 is set to D, and the peak area appearing in 1650 to 1800 cm ^-1 is set to E). The hard-coated film according to any one of claims 1 to 3, wherein the free radiation-curable resin contains an acrylic resin containing a (meth) acrylfluorene group. The hard-coated film according to any one of claims 1 to 4, wherein the substrate film is any one selected from a cycloolefin film, polyethylene terephthalate, and polyethylene naphthalate.