JP2013071274A - Hard coat film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coat film provided with a hard coat layer on a biaxially oriented polyester film via an easy-bonding layer and particularly excellent in adhesion under conditions of wet-heat resistance.SOLUTION: The hard coat film 10 is provided with the hard coat layer 3 via the easy-bonding layer 2 provided at least on one surface of the biaxially oriented polyester firm 1. The easy-bonding layer 2 is made of acrylic modified product in which the glass transition point is 50-105°C and in which the weight average molecular weight is 300,000-550,000. The hard coat layer 3 contains an ionizing radiation curable resin composition.

Description

  The present invention relates to a hard coat film, and more specifically, a liquid crystal display device, a CRT display device, a plasma display device, an EL (electroluminescence) display device, a display device component such as a touch panel, and a window glass for buildings, automobiles, and trains. It is related with the hard-coat film excellent in the adhesiveness of the biaxially-oriented polyester film and hard-coat layer through an easily bonding layer which can be used as protective films, such as.

  Polyester films have traditionally been excellent in transparency, mechanical properties, heat resistance, dimensional stability, electrical insulation, etc., so magnetic recording materials, packaging materials, electrical insulation materials, various photographic materials, graphic arts materials It is used as a base material for many uses such as. However, since the surface hardness and abrasion resistance of the film are inferior, the surface is easily scraped by contact with other hard substances, friction, scratching, etc., and scratches generated on the surface reduce the commercial value and cannot be used in a short period of time. There are disadvantages.

  Polyester film is stretched in a uniaxial or biaxial direction because the polyester film has the property that when aligned in a certain direction with heating to some extent, the molecules are aligned in the deformation direction. Is generally performed. In addition, this stretching process can improve chemical resistance and transparency.

  However, since the stretched polyester film alone is insufficient in abrasion resistance and scratch resistance, it is possible to improve the scratch resistance and abrasion resistance by providing a hard coat layer on the polyester film. Though conceivable, for example, a hard coat layer containing a polar resin such as an acrylic resin has a problem that it is difficult to adhere to a polyester film.

Therefore, methods for modifying the surface of the polyester film by corona discharge treatment, plasma discharge treatment, ultraviolet irradiation treatment, etc. have been proposed in the past, but the adhesion with the hard coat layer is still insufficient, and the hard coat layer is There was a problem that it may peel from a base film.
For this problem, Patent Document 1 and Patent Document 2 include a surface activation method by chemical treatment using a specific organic compound or inorganic compound, a polyester resin, an acrylic resin, a urethane resin on the base film surface, A method of providing each resin such as a sulfonate group-containing polyester resin and a urethane resin as a primer layer is disclosed. Patent Document 3 proposes a method (in-line coating method) in which a hard coat layer is applied to a polyester film before being subjected to a stretching treatment, dried and then subjected to stretching and heat treatment.

Japanese Patent Laid-Open No. 55-015825 JP 58-078761 A Japanese Patent Laid-Open No. 10-166531

  However, a surface activation method by chemical treatment or the like as disclosed in Patent Document 1 and Patent Document 2 described above, or a primer layer of a specific resin is provided between the biaxially oriented polyester film and the hard coat layer. In this case, although the adhesion between the polyester film and the hard coat layer is improved as compared with the conventional case, the coating film of the hard coat layer is easily peeled off from the base film under the heat and humidity resistance conditions (for example, under high temperature and high humidity). There is a problem that the adhesion under wet heat resistance is insufficient.

  In addition, in the in-line coating method disclosed in Patent Document 3 above, there is a difference in physical properties such as elongation of the resin constituting the polyester film and the hard coat layer in which the crystal orientation is not completed. Since a load is applied to the polyester film or the hard coat layer after the treatment, there is a problem that a hard coat film having a sufficient quality cannot be obtained in terms of adhesion between the base film and the hard coat layer.

  Therefore, in view of such conventional problems, the present invention provides a hard coat film in which a hard coat layer is provided on a biaxially oriented polyester film via an easy-adhesion layer, particularly for adhesion under moisture and heat resistance conditions. An object is to provide an excellent hard coat film.

  As a result of intensive studies to solve the problems of the prior art, the present inventors have found that a hard coat film is provided with a hard coat layer via an easy-adhesion layer provided on at least one side of a biaxially oriented polyester film. Then, paying attention to the material of the easy-adhesion layer, the easy-adhesion layer is formed of an acrylic modified product having a glass transition point of 50 to 105 ° C. and a weight average molecular weight of 30 to 550,000, and thus is particularly resistant to moisture. The inventors have found that a hard coat film having excellent adhesion under thermal conditions can be obtained, and have completed the present invention.

That is, the present invention has the following configuration.
(Invention of Configuration 1)
A hard coat film provided with a hard coat layer via an easy-adhesion layer provided on at least one side of a biaxially oriented polyester film, wherein the easy-adhesion layer has a glass transition point of 50 to 105 ° C. and weight A hard coat film comprising an acrylic modified product having an average molecular weight of 300 to 550,000.

(Invention of Configuration 2)
The hard-coated film according to Structure 1, wherein the acrylic modified material constituting the easy-adhesion layer is an acrylic modified product having methyl methacrylate as a skeleton.

(Invention of Configuration 3)
The acrylic modified product is an acrylic resin modified with a polyolefin resin, a hydrocarbon having an unsaturated double bond or a hydrocarbon having a saturated double bond, a urethane resin, or a polyester resin. 2. The hard coat film according to 2.

(Invention of Configuration 4)
The hard coat layer is a hard coat film according to any one of configurations 1 to 3, wherein the hard coat layer contains an ionizing radiation curable resin composition.

(Invention of Configuration 5)
5. The hard coat film according to Configuration 4, wherein the ionizing radiation curable resin composition is an acrylic resin composition having three or more (meth) acryloyloxy groups in one molecule.

  According to the present invention, a hard coat film is provided with a hard coat layer via an easy-adhesion layer provided on at least one surface of a biaxially oriented polyester film, and the easy-adhesion layer has a glass transition point of 50 to 105. It is possible to obtain a hard coat film that is excellent in adhesion particularly under wet heat resistance, which has been a conventional problem, by being composed of an acrylic modified product having a temperature average molecular weight of 30 to 550,000. .

It is sectional drawing which shows the layer structure of the hard coat film of this invention.

  The hard coat film of the present invention is a hard coat film 10 in which a hard coat layer 3 is provided on at least one surface of a biaxially oriented polyester film 1 as shown in FIG. The layer 2 is characterized by comprising an acrylic modified product having a glass transition point of 50 to 105 ° C. and a weight average molecular weight of 300 to 550,000.

  In the present invention, the biaxially oriented polyester film 1 that is the base material of the hard coat film 10 is a polyester film biaxially oriented by longitudinal and transverse stretching, and the longitudinal and transverse stretching ratio is preferably 2.5 times or more, More preferably, the longitudinal and lateral draw ratio is 3 to 6 times. When the draw ratio is less than 2.5, it is difficult to obtain sufficient strength, chemical resistance, and transparency. In addition, the upper limit of the draw ratio is not particularly specified, but if it becomes too large, it becomes difficult to produce, and there is no significant difference in the effect of improving the strength, chemical resistance, and transparency of the polyester film by the stretching treatment. Therefore, for example, it is preferable that it is 6 times or less.

  In the present invention, examples of the raw material for the polyester film include polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and the like, but are not limited thereto. However, it is preferable to use polyethylene terephthalate (PET) from the viewpoints of heat resistance, economy, and availability.

  In the present invention, the thickness of the polyester film is appropriately selected according to the use for which the hard coat film is used, but is preferably 9 to 500 μm, more preferably from the viewpoint of mechanical strength, handling properties, and the like. Is 12 to 250 μm.

  In the present invention, the acrylic modified product constituting the easy-adhesion layer 2 needs to have a glass transition point of 50 to 105 ° C. and a weight average molecular weight of 300 to 550,000. When the glass transition point is less than 50 ° C., there is a problem that blocking between the easy adhesion layer and the base film occurs in winding of the base film with the easy adhesion layer applied thereto. Further, there is no actual resin having a glass transition point of more than 105 ° C. as a resin suitable for the material of the easy adhesion layer. On the other hand, when the polymerization average molecular weight is less than 300,000, the solvent resistance of the coating film is lowered, and when the hard coat paint is applied, the easy-adhesion layer is eroded by the dilute solvent of the hard coat paint and easily adheres to the base film. There is a problem of poor adhesion to the layer. On the other hand, if the polymerization average molecular weight exceeds 500,000, the viscosity of the coating becomes high and the coating property is lowered, which is not preferable.

In the present invention, the resin skeleton of the acrylic modified product used as the material of the easy-adhesion layer 2 is preferably methyl methacrylate from the viewpoint of transparency, heat resistance, chemical resistance, coating film strength, light resistance, and the like.
In the present invention, an acrylic modified product refers to an acrylic resin, a hydrocarbon having an unsaturated double bond or a hydrocarbon having a saturated double bond, an olefin or polyolefin resin, a urethane resin, an alkyd resin, a rubber, a silicone resin. An acrylic resin modified with a polyester resin, an epoxy group or a resin having an epoxy group, an imide group or a resin having an imide group, a resin having fluorine or fluorine, a resin having a carboxy group or a carboxyl group, etc. Acrylic resin and other resins such as graft polymer of polyester resin and graft polymer of acrylic resin and urethane resin, copolymer of acrylic resin and polyolefin resin, block copolymer of acrylic resin and polyolefin resin, etc. Polymers, also block copolymers relevant.

  In the present invention, the acrylic modified product is a polyolefin resin, a hydrocarbon having an unsaturated double bond or a saturated double bond, a urethane resin in order to provide adhesion between the biaxially oriented polyester film and the hard coat layer. It is preferably modified and more preferably modified with a hydrocarbon having an unsaturated double bond or a saturated double bond. In addition, it is preferable that it is a butadiene as a monomer which comprises the hydrocarbon which has an unsaturated double bond.

In the present invention, the coating amount of the adhesive layer 2 is preferably in the range of 0.3 to 1.5 g / ^{m 2,} more preferably from 0.7 to 1.2 g / ^{m 2.} When the coating amount is less than 0.3 g / m ² , it is difficult to provide a uniform easy-adhesion layer, and the adhesion with the hard coat layer is lowered, which is not preferable. On the other hand, if the coating amount exceeds 1.5 g / m ² , the scratch resistance after forming the hard coat layer may be insufficient, which is not preferable.

  In the present invention, a leveling agent can be used for the purpose of improving the coatability of the easy-adhesion layer 2, and a known leveling agent such as a fluorine-based, acrylic-based, or silicone-based additive or a mixture thereof is used. Is possible. The addition amount can be added in the range of 0.03 to 3.0 parts by weight with respect to 100 parts by weight of the resin for the easy adhesion layer.

  In the present invention, a benzotriazole-based ultraviolet absorber or a benzophenone-based ultraviolet absorber can be added to the easy-adhesion layer 2 for the purpose of imparting light-resistant adhesion. The addition amount is preferably 0.05 to 10.0 parts by weight with respect to 100 parts by weight of the resin. Particularly preferred is 1.0 to 5.0 parts by weight.

  In the present invention, the organic solvent for forming the resin for the easy-adhesion layer is preferably one having a boiling point of 50 ° C. to 150 ° C. from the viewpoints of workability during coating and drying properties. Specific examples include known solvents such as methanol, ethanol, isopropyl alcohol, normal propyl alcohol, methyl acetate, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, toluene, methyl cellosolve, ethyl cellosolve, or a combination of several kinds thereof. You can also

  In the present invention, the method for applying the easy-adhesion layer coating on the polyester film 1 is not particularly limited, and various coating methods, reverse coating methods, gravure coating methods, bar coating methods, die coating methods, spray coatings. Any method can be used.

  In the present invention, as the resin constituting the hard coat layer 3, it is preferable to use an ionizing radiation curable resin composition from the viewpoint of wear resistance and scratch resistance. This ionizing radiation curable resin composition has three or more (meth) acryloyloxy groups in one molecule (however, in the present invention, (meth) acryloyloxy group is an abbreviation of acryloyloxy group and methacryloyloxy group). From the viewpoint of scratch resistance, it is preferable to use a mixture of one or more of those having the above. Specific examples include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, Although dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, etc. can be illustrated, it is not limited to these.

  In the present invention, as a method of curing the ionizing radiation curable resin composition, a method of irradiating ultraviolet rays can be used. When this method is used, it is preferable to add a photopolymerization initiator to the resin composition. Specific examples of the photopolymerization initiator include acetophenone, benzophenone, benzoyl methyl ether, benzoyl ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, dibenzyl, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, Tetramethylthiuram monosulfide, tetramethylthiuram disulfide, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one compounds, etc. Can be used. These photopolymerization initiators may be used alone or in combination of two kinds. The addition amount of the photopolymerization initiator is about 0.01 to 10 parts by weight and about 2.5 to 5 parts by weight with respect to 100 parts by weight of the ionizing radiation curable resin composition. preferable.

In the present invention, the coated amount of the hard coat layer 3 is preferably 1.5~10.0g / ^{m 2,} more preferably from 2.0~5.0g / ^{m 2.} When the coating amount is less than 1.5 g / m ² , the scratch resistance becomes insufficient. On the other hand, if the coating amount is more than 10.0 g / m ² , the curl of the hard coat film is strong and easily becomes a cylindrical curl, which is not preferable.

  In the present invention, a leveling agent can be used for the purpose of improving the coatability in the hard coat layer 3, and a known leveling agent such as fluorine-based, acrylic-based, silicone-based, or an adduct or mixture thereof can be used. It can be used. The addition amount can be in the range of 0.03 to 3.0 parts by weight with respect to 100 parts by weight of the resin.

  In the present invention, the hard coat layer 3 has a non-reactive or radically polymerizable (meth) acrylic functional group having a (meth) acrylic functional group and a benzophenone-based ultraviolet absorption for the purpose of imparting light-resistant adhesion. An agent can be added. The addition amount is preferably 0.05 to 10.0 parts by weight with respect to 100 parts by weight of the ionizing radiation curable resin composition. Particularly preferred is 1.0 to 5.0 parts by weight.

  In the present invention, a light stabilizer, a thermoplastic resin, a thermosetting resin, and an antifoaming agent can be added to the hard coat paint forming the hard coat layer 3 as necessary. Moreover, as an organic solvent for making resin for hard-coat layers into a paint, a thing with a boiling point of about 50-150 degreeC is preferable from the point of workability | operativity at the time of coating, and drying property. Specific examples include known solvents such as methanol, ethanol, isopropyl alcohol, normal propyl alcohol, methyl acetate, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, toluene, methyl cellosolve, ethyl cellosolve, or a combination of several types as appropriate. It can also be used. Various coating methods, reverse coating methods, gravure coating methods, bar coating methods, die coating methods, spray coating methods, and the like can be arbitrarily used as a method of applying the hard coat layer coating onto the polyester film.

EXAMPLES Next, although an Example and a comparative example are given and this invention is demonstrated concretely, this invention is not limited to a following example.
Example 1
On one side of a 25 μm thick biaxially oriented polyester film (trade name T-60, manufactured by Toray Industries, Inc.), an acrylic modified product (block copolymer of acrylic resin and butadiene, glass transition point: 105 ° C., weight average) (Molecular weight: 450,000) 100 parts by weight, 50 parts by weight of toluene, 30 parts by weight of ethyl acetate, 20 parts by weight of ethyl cellosolve were mixed with a coating for an easy-adhesion layer using a bar coater. It was dried in a drying furnace for 1 minute to form an easy-adhesion layer with a coating amount of 0.80 g / m ² .

Next, 80 parts by weight of dipentaerythritol hexa (meth) acrylate (trade name: DPHA, manufactured by Kyoeisha Chemical Co., Ltd.) as an ionizing radiation curable resin composition on the easy-adhesion layer, 2-methyl-1- [ 4- (Methylthio) phenyl] -2-morpholinopropan-1-one (trade name: Irgacure 907, manufactured by BASF) 3.6 parts by weight,> N-CH ₃ type hindered amine light stabilizer (trade name: Tinuvin 292 (manufactured by BASF) 2.0 parts by weight, normal propyl alcohol 80 parts by weight, toluene 35 parts by weight, and ethyl acetate 35 parts by weight are mixed using a bar coater. And dried in an oven at 80 ° C. for 1 minute to form a hard coat layer having a coating amount of 3.0 g / m ² . This was cured at a UV irradiation amount of 150 mJ / cm ² using a UV irradiation device set at a height of 60 mm from the coated surface to obtain a hard coat film. The results are shown in Table 1.

(Example 2)
A hard coat film was obtained in the same manner as in Example 1 except that the coating amount of the easy-adhesion layer in Example 1 was 0.3 g / m ² . The results are shown in Table 1.

(Example 3)
A hard coat film was obtained in the same manner as in Example 1 except that the coating amount of the easy-adhesion layer in Example 1 was 1.5 g / m ² . The results are shown in Table 1.

Example 4
In Example 1, a hard coat film was obtained in the same manner as in Example 1 except that the coating amount of the easy-adhesion layer was 1.6 g / m ² . The results are shown in Table 1.

(Example 5)
As an ionizing radiation curable resin composition used for the hard coat layer of Example 1, polyethylene glycol dimethacrylate having two (meth) acryloyloxy groups in one molecule (trade name: Sartomer SR210, Sartomer Japan Co., Ltd.) A hard coat film was obtained in the same manner as in Example 1 except that the product was changed to “manufactured”. The results are shown in Table 1.

(Example 6)
The resin for easy adhesion layer used in Example 1 was changed to a block copolymer of acrylic and unsaturated compound (butadiene) having a glass transition point of 50 ° C. and a weight average molecular weight of 550,000. A hard coat film was produced in the same manner as in Example 1. The results are shown in Table 1.

(Example 7)
The resin for easy adhesion layer used in Example 1 was changed to a block copolymer of acrylic and unsaturated compound (butadiene) having a glass transition point of 50 ° C. and a weight average molecular weight of 300,000. A hard coat film was produced in the same manner as in Example 1. The results are shown in Table 1.

(Example 8)
The resin for easy adhesion layer used in Example 1 was changed to a block copolymer of acrylic and unsaturated compound (butadiene) having a glass transition point of 105 ° C. and a weight average molecular weight of 550,000. A hard coat film was produced in the same manner as in Example 1. The results are shown in Table 1.

Example 9
The resin for easy adhesion layer used in Example 1 was changed to a block copolymer of acrylic and unsaturated compound (butadiene) having a glass transition point of 105 ° C. and a weight average molecular weight of 300,000. A hard coat film was produced in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 1)
In Example 1, a hard coat film in which a hard coat layer was formed without providing an easy adhesion layer was obtained. The results are shown in Table 1.

(Comparative Example 2)
The resin used for the easy-adhesion layer of Example 1 is an unmodified methyl methacrylate resin (trade name: Dianar BR88, manufactured by Mitsubishi Rayon Co., Ltd.) having a glass transition point of 105 ° C. and a weight average molecular weight of 430,000. A hard coat film was obtained in the same manner as in Example 1 except that it was used. The results are shown in Table 1.

(Comparative Example 3)
The resin used for the easy-adhesion layer of Example 1 was a copolymer polyester resin (trade name: Byron 200, manufactured by Toyobo Co., Ltd.) having a glass transition point of 67 ° C. and a weight average molecular weight of 17,000. Except for this, a hard coat film was obtained in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 4)
The resin for easy adhesion layer used in Example 1 was changed to a block copolymer of acrylic and unsaturated compound (butadiene) having a glass transition point of 105 ° C. and a weight average molecular weight of 250,000. A hard coat film was produced in the same manner as in Example 1. The results are shown in Table 1.

In the above Examples and Comparative Examples, the coating amount of the easy adhesion layer was calculated as follows.
Using a METTLER TRADE Co., Ltd. METTLER ML-230 type electronic balance, an easy-adhesion layer treated film and an untreated film were used as samples, and the coating amount was calculated by the following formula. In addition, the sample used 2 sheets of 50 cm long and 20 cm wide (a sample was 1 m ² ).
Calculation formula Coating amount = Easy adhesive layer treated film weight-Untreated film weight

The following evaluations were performed on the hard coat films prepared in the above Examples and Comparative Examples, and the results are summarized in Table 1.
(1) Adhesion-1
Under constant temperature and humidity conditions (temperature 23 ° C., humidity 53% RH), 100 cross cuts of 1 mm ² were produced on the hard coat layer of the produced hard coat film using a cross-cut peel test jig, and Sekisui Chemical Kogyo tape manufactured by Kogyo Co., Ltd. 252 was affixed on it, pressed uniformly with a spatula, peeled in the direction of 90 degrees, and the number of remaining hard coat layers was evaluated in four stages. The evaluation criteria are as follows. Also, ◎ and ○ evaluation products were considered to have good adhesion.
◎: 100 ○: 99-95 △: 50-94 ×: 0-49

(2) Adhesion-2
The prepared hard coat film was stored for 3 days under wet heat storage (temperature 80 ° C., humidity 90% RH), then taken out, left for 30 minutes under constant temperature and humidity conditions (temperature 23 ° C., humidity 53% RH), and the above The same adhesion evaluation as in (1) was performed.

(3) Scratch resistance The hard coat layer surface of the produced hard coat film was subjected to 10 reciprocal frictions using steel wool # 00000 under a load of 1 kg, and the degree of scratches was evaluated according to the following criteria. ○ Although the evaluation product has good scratch resistance, Δ evaluation product can be used as a product.
○: No scratches are generated. Δ: Some scratches occur. ×: Innumerable scratches occur.

(4) Blocking aptitude From the treated film provided with an easy-adhesion layer on one side of the polyester film according to the example, two samples, each of which is cut to 10 cm in length and breadth, are overlapped, sandwiched between aluminum plates and subjected to a load of 10 kg, the temperature After storage for 48 hours in a dryer at 50 ° C., the sample was taken out and cooled, and then the degree of blocking of the film was evaluated in three stages. The evaluation criteria are as follows. ○ The evaluation product was considered to have good blocking aptitude.
○: No blocking. Δ: Some blocking marks in the center. X: Blocking occurs on the entire surface.

  From the results of Table 1, Examples 1 to 9 of the present invention using an acrylic modified product having a glass transition point of 50 to 105 ° C. and a weight average molecular weight of 30 to 550,000 as the easy-adhesion layer are all in close contact. There were no problems in any of the evaluations of property, scratch resistance and blocking aptitude. In particular, good results were obtained in the evaluation of adhesiveness-2 under wet heat resistance conditions, and it was confirmed that the hard coat film according to the present invention was excellent in adhesiveness particularly under wet heat resistance conditions.

  On the other hand, the comparative example 1 which did not provide an easily bonding layer, the glass transition point 50-105 degreeC, the weight average molecular weight is 30-550,000, but the comparative example 2 which used the acrylic unmodified | denatured material as an easily bonding layer, an easily bonding layer In Comparative Example 3 using a resin other than the acrylic modified product, the adhesion was insufficient. Further, Comparative Example 4 using an acrylic modified product having a glass transition point of 50 to 105 ° C. but having a weight average molecular weight of less than 300,000 as an easy-adhesive layer has improved adhesion compared to Comparative Examples 1 to 3. However, the adhesion under wet heat resistance is still poor and the adhesion is still insufficient.

1 Biaxially oriented polyester film 2 Adhesive layer 3 Hard coat layer 10 Hard coat film

Claims (5)

  A hard coat film provided with a hard coat layer via an easy-adhesion layer provided on at least one side of a biaxially oriented polyester film, wherein the easy-adhesion layer has a glass transition point of 50 to 105 ° C. and weight A hard coat film comprising an acrylic modified product having an average molecular weight of 300 to 550,000.   The hard coat film according to claim 1, wherein the acrylic modified product constituting the easy-adhesion layer is an acrylic modified product having methyl methacrylate as a skeleton.   The acrylic modified product is an acrylic resin modified with a polyolefin resin, a hydrocarbon having an unsaturated double bond or a hydrocarbon having a saturated double bond, a urethane resin, or a polyester resin. Or the hard coat film of 2.   The hard coat film according to any one of claims 1 to 3, wherein the hard coat layer contains an ionizing radiation curable resin composition. The hard coat film according to claim 4, wherein the ionizing radiation curable resin composition is an acrylic resin composition having three or more (meth) acryloyloxy groups in one molecule.

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