JP4848200B2 - Hard coat agent and hard coat film for insert molding - Google Patents

Description

The present invention relates to a hard coat agent and a hard coat film for insert molding .

An insert film printed on the back surface of a PET (polyethylene terephthalate) film coated with a hard coat resin is attached to a mold and painted with the film simultaneously with molding.
JP-A-7-173222 JP 2000-344910 A JP-A-9-95098

  Conventionally, a high molecular weight urethane-modified acrylate having excellent flexibility as a resin has been mainly used, but the surface properties are not satisfactory. On the other hand, development using a hard coat resin or the like has been performed in order to satisfy the surface hardness. However, since it is too hard, there has been a problem that cracks are generated in the curved surface portion during molding. For this reason, a film having both surface hardness (pencil hardness, scratch resistance) and flexibility (bendability) is desired as an insert film.

The present invention has been studied in view of such circumstances , and with respect to 100 parts by weight of a triazine ring-containing (meth) acrylate prepolymer synthesized in one step from an aminotriazine compound, paraformaldehyde, and a hydroxyl group-containing (meth) acrylate, Insert hard having both surface hardness and flexibility by using a hard coating agent characterized by containing 1 to 50 parts by weight of organic fine particles having an average primary particle size of 80 to 500 nm synthesized by an emulsion polymerization method A coated film can be produced and the above-mentioned problems can be solved.

By using the hard coat agent of the present invention , sufficient flexibility and surface physical properties can be achieved at a dry film thickness of 1 to 10 μm.
Hereinafter, the present invention will be described in detail.

(1) The invention of claim 1
The average primary particle size synthesized by the emulsion polymerization method is 80 with respect to 100 parts by weight of the triazine ring-containing (meth) acrylate prepolymer synthesized in one step from an aminotriazine compound, paraformaldehyde, and a hydroxyl group-containing (meth) acrylate. A hard coat agent comprising 1 to 50 parts by weight of organic fine particles of ˜500 nm . The average molecular weight of the triazine ring-containing (meth) acrylate prepolymer is preferably 200 to 20000. If the average molecular weight is less than the lower limit, sufficient performance for hard coat cannot be obtained, and if it exceeds 20000, the viscosity becomes too high. Coating becomes difficult.

An aminotriazine compound is a compound having a structure in which an amino group is bonded to three carbon atoms of a triazine ring composed of C ₃ N ₃ , and the aminotriazine compound refers to aminotriazine itself or an aminotriazine derivative.

  Examples of aminotriazines include melamine, and examples of aminotriazine derivatives include benzoguanamine, acetoguanamine, cyclohexanecarboguanamine, cyclohexenecarboguanamine, norbornanecarboguanamine, and nobornenecarboguanamine.

  As the hydroxyl group-containing (meth) acrylate, in addition to 2-hydroxyethyl acrylate and 2-hydroxyethyl methacrylate, if necessary, a compound having an ethylenically unsaturated bond having at least one hydroxysyl group, for example, 2-hydroxypropyl (Meth) acrylate, 4-hydroxybutyl acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, trimethylolpropane mono (meth) acrylate, trimethylolpropane di (meth) acrylate, allyl alcohol, ethylene glycol Allyl ether, glycerin (mono, di) allyl ether, N-methylol (meth) acrylamide and the like or a mixture thereof can be added. You may use individually and in mixture, Among these, 2-hydroxyethyl (meth) acrylate is preferable from the point of cost or handleability.

The prepolymer is synthesized by the following method. Synthetic reactions include the formation of methylol groups by addition of formaldehyde to aminotriazine compounds and the condensation reaction of methylol groups with hydroxyl groups of hydroxyl group-containing (meth) acrylates, or aminotriazine compounds and hydroxyl group-containing (meth) acrylates, formaldehyde It is understood that the reaction proceeds with a condensation reaction by reaction with hemiacetal. The degree of progress of the condensation reaction can be determined by the amount of water released by these condensation reactions. The condensation reaction can be controlled by grasping the amount of water over time and stopping the water distillation at a predetermined stage.
Examples of the organic fine particles include organic fine particles such as a styrene resin, a styrene-acrylic copolymer resin, and an acrylic resin synthesized by an emulsion polymerization method. In methods other than the emulsion polymerization method, there are many variations in the primary particle size, and the balance of flexibility in the surface is poor. In addition, in the dispersion polymerization method in which monodispersed fine particles can be easily synthesized, there is a problem that the amount of the crosslinking agent added cannot be increased, so that it is dissolved in the resin. Therefore, an emulsion polymerization method in which the average primary particle diameter can be easily controlled and a crosslinking agent can be added is preferable.

  The average primary particle diameter of the organic fine particles is preferably 80 to 500 nm. In the emulsion polymerization method, it is difficult to synthesize organic fine particles when the average primary particle diameter is less than 80 nm or more than 500 nm. Also, if it is less than 80 nm, the amount of addition required for forming irregularities on the surface increases, so hard coat performance cannot be obtained, but if it exceeds 500 nm, the haze increases and the visibility deteriorates. To do. The shape of the organic fine particles is preferably spherical or beaded, but is not particularly limited thereto. The average primary particle diameter is the diameter of a single particle that has not been agglomerated. For spherical particles, the diameter is indicated, and for particles other than the spherical shape, the arithmetic average value of the major axis diameter and the minor axis diameter is indicated. The value measured by an electron microscope.

The addition amount of the organic fine particles is preferably 1 to 50 parts by weight with respect to 100 parts by weight of the resin solid content, and if it is less than 1 part by weight, the flexibility cannot be satisfied, and if it exceeds 50 parts by weight, it is sufficient. Hard coat performance cannot be demonstrated. Preferably it is 10-30 weight part.
(2) The invention of claim 2
The hard coat agent according to claim 1, further comprising an isocyanate compound reacted with the triazine ring-containing (meth) acrylate prepolymer. Specifically, urethanization is a reaction of an unreacted hydroxyl group remaining in a triazine ring-containing (meth) acrylate prepolymer synthesized in one step from an aminotriazine compound, paraformaldehyde, and a hydroxyl group-containing (meth) acrylate with an isocyanate compound. 1 to 50 parts by weight of organic fine particles having an average primary particle diameter of 80 to 500 nm synthesized by an emulsion polymerization method are blended with 100 parts by weight of a triazine ring-containing (meth) acrylate prepolymer. It is a hard coat agent . Flexibility is further improved by urethane conversion. Examples of the isocyanate compound include aliphatic, alicyclic, aromatic, araliphatic isocyanate, and modified products thereof.

Examples of the aliphatic isocyanate include hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMDI), and lysine diisocyanate (LDI). Examples of the alicyclic isocyanate include dicyclohexylmethane diisocyanate (HMDI), isophorone diisocyanate (IPDI), 1 4-cyclohexane diisocyanate (CHDI), hydrogenated xylylene diisocyanate (HXDI), hydrogenated tolylene diisocyanate (HTDI), and the like.
In addition, aromatic diisocyanates include tolylene diisocyanate (TDI), 4,4 ′ (or 2,4 ′)-diphenylmethane diisocyanate (MDI), naphthalene diisocyanate (NDI), xylylene diisocyanate (XDI), and tolidine diisocyanate (TODI). P-phenylene diisocyanate (PPDI) and the like, and examples of the araliphatic polyisocyanate include α, α, α ′, α′-tetramethylxylylene diisocyanate (TMXDI) and the like.

  As a modified product of an araliphatic, aliphatic, alicyclic or aromatic isocyanate compound, some or all of the isocyanate groups of the above-exemplified compounds may be carbodiimide groups, uretdione groups, uretoimine groups, burette groups, isocyanurates. Examples thereof include compounds modified by a group, and two or more isocyanate compounds may be used in combination.

  In order to promote the reaction with the isocyanate group of the isocyanate component, an organotin-based urethanization catalyst is used, but as the organotin-based urethanization catalyst, any catalyst generally used in urethanization reactions may be used. , Dibutyltin dilaurate, dibutyltin diacetate, dibutyltin dialkylmalate, tin stearate, tin octylate and the like.

The amount of the organotin-based urethanization catalyst used is not particularly limited, but is suitably used within the range of 0.005 to 3% by weight.
If the lower limit is not reached, the urethane reaction does not proceed sufficiently. If the upper limit is exceeded, the reaction control becomes difficult due to heat generation during the urethane reaction.

(3) The invention of claim 3
The hard coat agent according to claim 1 or 2, further comprising a polyfunctional polymerizable monomer as a reactive compound. A polyfunctional polymerizable monomer is used as the reactive compound, and it is obtained by mixing or polymerizing. The polyfunctional polymerizable monomer has at least two (meth) acryloyl groups, vinyl groups, and allyl groups in the molecule. Among them, those having a (meth) acryloyl group have very high radical reactivity, and are superior in terms of fast curing and high hardness.
Specifically, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, penta Examples include polyfunctional (meth) acrylates such as erythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, hexanediol di (meth) acrylate, and diethylene glycol di (meth) acrylate. . These may be used alone or in combination.

(4) The invention of claim 4
A hard coat film for insert molding, wherein the hard coat agent according to claim 1, 2 or 3 is applied onto a transparent plastic film, dried and cured.
(5) The invention of claim 5
The total light transmittance is 90% or more, the pencil hardness of the hardened layer of the hard coating agent is 1H or more, the scratch resistance is good, and the bendability is 2R or less. Hard coat film for insert molding.
When the total light transmittance is 90% or less, the visibility is lowered, when the pencil hardness is less than 1H and the scratch resistance is poor, the surface hardness is insufficient, and when the bending property exceeds 2R, it cannot follow the deep molding process. Problems such as cracks occur.

(6) The invention of claim 6
The hard coat film for insert molding according to claim 4 or 5, wherein the hard coat agent has a cured film thickness of 1 to 10 µm . The hard coating agent is a plastic film so that the thickness of the coating film after curing is 1 to 10 μm by a known method such as gravure coating method, bar coating method, knife coating method, roll coating method, blade coating method, die coating method, etc. To be applied. If it is less than 1 μm, scratch resistance and pencil hardness are inferior, and if it exceeds 10 μm, flexibility is inferior.

  As the plastic film, in addition to a vinyl chloride film, an acrylic film, and a polycarbonate film, a polypropylene film, a low-stretch polyester film, a polybutylene terephthalate film, a polystyrene film, an acrylonitrile butadiene styrene film, a nylon film, and the like can be used.

  The hard coating agent applied to the plastic film is cured by irradiation with active energy rays such as ultraviolet rays and electron beams. In the case of curing with ultraviolet rays, the composition must contain a photopolymerization initiator, and in some cases, a photopolymerization sensitizer and a photopolymerization accelerator.

  The photopolymerization initiator for radical polymerization is not particularly limited and known types can be used. For example, benzoin monomethyl ether, benzoin isopropyl ether, benzophenone, benzyl dimethyl ketal, 2,2-diethoxyacetophenone, 1 -Hydroxycyclohexyl phenyl ketone and the like, and examples of the photosensitizer include 2-chlorothioxanthone, 2,4-diethylthioxanthone, and 2,4-diisopropylthioxanthone.

  Examples of the photo-accelerator include ethyl p-dimethylaminobenzoate, isoamyl p-dimethylaminobenzoate, 2-n-ptoxyethyl p-dimethylaminobenzoate, and 2-dimethylaminoethyl benzoate.

Furthermore, examples of the initiator for photocationic polymerization include diallyliodonium salts and triarylsulfonium salts.
In addition, an organic solvent can be added as a viscosity modifier, and various additives can be added to impart performance.
For example, antistatic agent, refractive index adjusting agent, antioxidant, ultraviolet absorber, light stabilizer, photosensitizer, leveling agent, antifoaming agent, inorganic filler, coupling agent, preservative, plasticizer, It is good also considering a flow regulator, a thickener, a pH adjuster etc. as a compounding material.

As the ultraviolet irradiation device, available device such as a known high-pressure mercury lamp or a metal halide lamp, irradiation energy is 100 to 2000 mJ / cm ^2, further 300~700mJ / cm ² is more preferable. In addition, it is preferable that the irradiation is performed in a nitrogen gas atmosphere because the scratch resistance is further improved.

  Moreover, when hardening with an electron beam, a conventionally well-known hardening apparatus can be used, 10 kGy-200 kGy are preferable, and also 30 kGy-100 kGy are more preferable. If it is less than 10 kGy, complete curing cannot be achieved, and if it exceeds 200 kGy, the life of the electron beam irradiation tube is remarkably shortened, which is not economical. Moreover, although an acceleration voltage is set with the coating-film thickness and density which are provided on a base material, 50 kv to 300 kv, Furthermore, 150 kv-250 kv are more preferable.

EXAMPLES Hereinafter, although an Example and a comparative example are given and demonstrated in detail about this invention, a specific example is shown and it does not specifically limit to these.
(A) Resin synthesis (1) Triazine ring-containing (meth) acrylate prepolymer A 2-liter separable flask equipped with a stirrer, thermometer, gas inlet tube, and reflux condenser was charged with 696 g of 2-hydroxyethyl acrylate ( 6 mol), 126 g (1 mol) of melamine, 189 g of 95 wt% paraformaldehyde (6 mol as formaldehyde), 3.0 g of paratoluenesulfonic acid and 0.2 g of hydroquinone monomethyl ether were added, and the temperature was increased while blowing air.
At 80 to 100 ° C., melamine and paraformaldehyde were dissolved in 2-hydroxyethyl acrylate, and then the reaction was continued while maintaining the internal temperature at 105 to 115 ° C. until the amount of distilled water reached 108 g (6 mol).
The resulting triazine ring-containing acrylate prepolymer (hereinafter referred to as AM), the viscosity of 2 Pa · s at 20 ° C., a bromine number 92.1 _(gBr 2 / 100g), and a molecular weight 3200.
(2) Urethane triazine ring-containing (meth) acrylate prepolymer To 100 parts by weight of the above AM, 28.7 parts by weight of isophorone diisocyanate (IPDI) and 0.1 part by weight of di-n-butyltin dilaurate (DBTDL) as a catalyst were added. After stirring for 24 hours at room temperature, isopropanol was added.
The reaction of the isocyanate group was confirmed by IR, and unreacted isopropanol was removed by an evaporator to obtain a urethanized melamine acrylate prepolymer (hereinafter referred to as U-AM).
(B) Synthesis of organic fine particles (1) Organic fine particle slurry A
In a polymerization vessel equipped with a stirrer, thermometer, reflux condenser and nitrogen gas inlet, 120 parts by weight of deionized water, 0.3 part by weight of sodium dialkylsulfosuccinate and 0.1 part by weight of sodium bicarbonate as a pH buffering agent Was heated to 60 ° C. with stirring, and then purged with nitrogen.
To this was added 2 parts by weight of methyl methacrylate, and 10 minutes later, 0.1 part of sodium persulfate dissolved in 0.98 parts by weight of deionized water was added to carry out seed polymerization.
60 minutes after the start of exotherm, 0.1 part by weight of sodium persulfate dissolved in 4.9 parts of deionized water was added, and after another 10 minutes, 43.7 parts by weight of methyl methacrylate, 29.1 parts by weight of styrene, While stirring an emulsified monomer solution consisting of 24.2 parts by weight of ethylene glycol dimethacrylate, 60 parts by weight of deionized water, 0.8 part by weight of sodium dialkylsulfosuccinate, and 0.3 part by weight of sodium bicarbonate, the temperature was raised to 80 ° C. The solution was added dropwise over 3 hours while maintaining, and the polymerization was terminated by maintaining 85 ° C. for 2 hours after completion of the addition to obtain an aqueous latex (A-1). The product (A-1) had a solid content of 33.9% and an average particle size of 489 nm.

  To the aqueous latex (A-1) synthesized above, 15 parts by weight of an ion exchange resin was added and stirred for the purpose of removing ionic impurities that hindered phase inversion to an organic solvent. After stirring for 24 hours, the ion exchange resin was removed by filtration to obtain an aqueous latex (A-2) having an unlimited amount of ionic impurities.

To the purified aqueous latex (A-2), 570 parts by weight of ethyl acetate was added and stirred, and the organic fine particles present in the aqueous latex were phase-inverted to the organic layer. Thereafter, the mixture was allowed to stand to separate a transparent aqueous phase and a cloudy organic phase to obtain a non-aqueous fine particle dispersion (A-3). The organic fine particle slurry A (A-3) had a solid content of 15.0%.
(2) Organic fine particle slurry B
In a polymerization vessel equipped with a stirrer, thermometer, reflux condenser and nitrogen gas inlet, 120 parts by weight of deionized water, 0.8 part by weight of sodium dialkylsulfosuccinate and 0.4 part by weight of sodium bicarbonate as a pH buffering agent Was heated to 60 ° C. with stirring, and then purged with nitrogen.
To this was added 2 parts by weight of methyl methacrylate, and 10 minutes later, 0.1 part by weight of sodium persulfate dissolved in 0.98 parts by weight of deionized water was added to perform seed polymerization.
60 minutes after the start of heat generation, 0.1 part by weight of sodium persulfate dissolved in 4.9 parts by weight of deionized water was added, and after another 10 minutes, 43.7 parts by weight of methyl methacrylate and 29.1 parts by weight of styrene The emulsion monomer liquid consisting of 24.2 parts by weight of ethylene glycol dimethacrylate, 60 parts by weight of deionized water, 1.2 parts by weight of sodium dialkylsulfosuccinate and 0.5 parts by weight of sodium bicarbonate was stirred and the temperature was adjusted to 80 ° C. The mixture was added dropwise over 3 hours while maintaining the temperature, and maintained at 85 ° C. for 2 hours after the completion of the dropwise addition to complete the polymerization to obtain an aqueous latex (B-1). The product (B-1) had a solid content of 34.1% and an average primary particle size of 109 nm.

  An ion exchange resin (Amberlite MB-2, manufactured by Rohm and Haas) 25 for the purpose of removing ionic impurities that hinder phase inversion to an organic solvent in the aqueous latex (B-1) synthesized above. A part by weight was added and stirred. After stirring for 24 hours, the ion exchange resin was removed by filtration to obtain an aqueous latex (B-2) having an unlimited amount of ionic impurities.

  To this purified aqueous latex (B-2), 570 parts by weight of ethyl acetate was added and stirred, and the organic fine particles present in the aqueous latex were phase-inverted to the organic layer. Thereafter, the mixture was allowed to stand to separate a transparent aqueous phase and a cloudy organic phase, thereby obtaining a non-aqueous fine particle dispersion (B-3). The organic fine particle slurry B (B-3) had a solid content of 15.1%.

(1) Hard coat agent To 100 parts by weight of the above AM, 20 parts by weight of organic fine particle slurry A, 133 parts by weight of MEK, and 5 parts by weight of 1-hydroxy-cyclohexyl phenyl ketone as an initiator are added. Obtained.
(2) Hard molding film for insert molding Next, the hard coating agent was applied to a 100 μm polyethylene terephthalate film (hereinafter referred to as PET film) by a bar coating method so as to have a cured film thickness of 2 μm, and then using a hot air dryer. Drying was performed at 100 ° C. for 2 minutes.
Thereafter, a hard coat film was obtained by irradiating ultraviolet rays with an integrated light quantity of about 200 mJ / cm ² using an ultraviolet irradiation device (Fusion lamp manufactured by Fusion UV Systems Japan Co., Ltd.).

  The hard coat film of Example 2 was obtained in the same manner as in Example 1 except that the organic fine particle slurry B was changed to 300 parts by weight with respect to 100 parts by weight of AM and the cured film thickness was 7 μm.

  In Example 2, U-AM was used instead of AM, except that the organic fine particle slurry B was 13 parts by weight, MEK was 39 parts by weight, and the cured film thickness was changed to 3 μm with respect to 100 parts by weight of U-AM. In the same manner, a hard coat film of Example 3 was obtained.

  A hard coat film of Example 4 was obtained in the same manner as in Example 3 except that 267 parts by weight of the organic fine particle slurry B, MEK was not added, and the cured film thickness was changed to 8 μm.

  In Example 3, 100 parts by weight of a resin mixture containing 70% U-AM and 30% dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku Co., Ltd., trade name Kayarad DPHA non-volatile content: 100%, hereinafter referred to as DPHA) On the other hand, a hard coat film of Example 5 was obtained in the same manner except that the organic fine particle slurry A was changed to 200 parts by weight.

  The hard coat of Example 6 was carried out in the same manner as in Example 5 except that it was changed to pentaerythritol triacrylate (manufactured by Nippon Kayaku Co., Ltd., trade name Kayarad PET-30 nonvolatile content 100%) instead of DPHA. A film was obtained.

Comparative Example 1
In Example 1, except that the organic fine particle slurry A was changed to 133 parts by weight, the MEK was changed to 37 parts by weight and the cured film thickness was changed to 0.5 μm with respect to 100 parts by weight of AM, and UV irradiation was performed in a nitrogen gas atmosphere. It carried out similarly.

Comparative Example 2
In Comparative Example 1, the cured film thickness was changed to 12 μm, and the same procedure was performed except that UV irradiation was performed in the air instead of in a nitrogen gas atmosphere.

Comparative Example 3
In Example 2, 0.7 parts by weight of organic fine particle slurry B and 149 parts by weight of MEK were added to 100 parts by weight of AM, and the same procedure was carried out except that the cured film thickness was changed to 3 μm.

Comparative Example 4
In Example 4, 367 parts by weight of the organic fine particle slurry B was added to 100 parts by weight of AM, and the cured film thickness was changed to 3 μm without adding MEK.

Comparative Example 5
In Example 5, with respect to 100 parts by weight of the resin mixture, 133 parts by weight of the organic fine particle slurry B, 37 parts by weight of MEK, and 0.5 μm of the cured film thickness were changed, and UV irradiation was performed in a nitrogen gas atmosphere. The procedure was the same except that.

Comparative Example 6
In Example 6, the same procedure was performed except that 367 parts by weight of the organic fine particle slurry A and MEK were not added to 100 parts by weight of the resin mixture.
The evaluation results are shown in Table 1.

The evaluation method was as follows.
Test / Evaluation Method (1) Measurement of Total Light Transmittance (Tt) Measured based on the provisions of JIS K 7361-1 (2000 version) 3.2. As a measuring device, Hazeguard II manufactured by Toyo Seiki Seisakusho Co., Ltd. was used.
(2) Measurement of haze value (Hz) The haze value (Hz) was measured with a haze meter (manufactured by Suga Test Instruments Co., Ltd.) based on the provisions of JIS K 7136 (2000 version). As a measuring device, Hazeguard II manufactured by Toyo Seiki Seisakusho Co., Ltd. was used.
(3) Measurement of pencil hardness It was performed according to the provisions of JIS K 5600-5-4 (1999 edition). As a measuring apparatus, a pencil scratch coating film hardness tester (type P) manufactured by Toyo Seiki Seisakusho Co., Ltd. was used. 1H or higher was OK, and F or lower was NG.
(4) Measurement of scratch resistance The surface of the obtained film was rubbed with steel wool # 0000 manufactured by Nippon Steel Wool Co., Ltd. with a load of ² kg / cm ² , and the degree of scratches was visually evaluated. The case where the number of scratches was 3 or less was marked with ◯, and the number of scratches was marked with ×.
(5) Measurement of bendability A hard coat film with the hard coat agent coated surface outside is wound around the outer periphery of a tube having a radius of 1R to 6R, and the evaluation is made based on whether or not the resin layer is cracked. The minimum radius without cracks was taken as the value of bendability. 1R to 2R was OK, and 3R or more was NG.

Claims (6)

The average primary particle size synthesized by the emulsion polymerization method is 80 with respect to 100 parts by weight of the triazine ring-containing (meth) acrylate prepolymer synthesized in one step from an aminotriazine compound, paraformaldehyde, and a hydroxyl group-containing (meth) acrylate. A hard coat agent comprising 1 to 50 parts by weight of organic fine particles of ˜500 nm. The hard coat agent according to claim 1, further comprising an isocyanate compound reacted with the triazine ring-containing (meth) acrylate prepolymer. Furthermore, the polyfunctional polymerizable monomer is included as a reactive compound, The hard-coat agent of Claim 1 or 2 characterized by the above-mentioned. A hard coat film for insert molding, wherein the hard coat agent according to claim 1, 2 or 3 is applied on a transparent plastic film, dried and cured. The total light transmittance is 90% or more, the pencil hardness of the hardened layer of the hard coating agent is 1H or more, the scratch resistance is good, and the bendability is 2R or less. Hard coat film for insert molding. The hard film for insert molding according to claim 4 or 5, wherein the hard coating agent has a cured film thickness of 1 to 10 µm .