JP2015120254A - Hard coat film and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coat film that can maintain excellent surface functions for a long period of time.SOLUTION: The hard coat film includes a hard coat layer (X), a primer layer (Y), and a surface layer (Z), successively layered on at least one surface of a substrate. The hard coat layer (X) and the primer layer (Y) form a coupling (xy); and the primer layer (Y) and the surface layer (Z) form a coupling (yz).

Description

  The present invention relates to a hard coat film that can be suitably used as a protective film for various touch panel displays such as smartphones and tablet terminals.

  As image display apparatuses such as portable electronic devices such as smartphones and tablet terminals, televisions, and personal computers, those equipped with touch panels are becoming widespread. Since the image display device equipped with the touch panel is usually operated by touching or pressing with a finger or a touch pen, the surface thereof can prevent dents and scratches that may occur when the touch pen is pressed. Durability is required.

  In addition to the above, various characteristics other than those described above are required for the image display device as its functionality increases. For example, the surface of the image display device may be required to have a surface function such as antifouling property capable of preventing adhesion of fingerprints and dirt in the atmosphere and anti-fogging performance with the spread of touch panel functions. is there.

  Among the surface functions, for example, as a hard coat film having excellent antifouling properties, a fluorine-based additive is added in advance to the active energy ray-curable composition, applied to the film substrate, and then cured by irradiation with ultraviolet rays. The hard coat film obtained by this is known (for example, refer patent document 1).

  However, the conventional hard coat film sometimes has a practically insufficient surface function, and it may be difficult to maintain the surface function for a long period of time.

JP 2010-168419 A

  The problem to be solved by the present invention is to provide a hard coat film that can maintain excellent surface function for a long period of time.

  As a result of intensive studies to solve the above problems, the present inventors have solved the above problems by forming a bond between the hard coat layer (X), the primer layer (Y), and the surface layer (Z). I found that it can be solved.

  That is, the present invention is a hard coat film in which a hard coat layer (X), a primer layer (Y), and a surface layer (Z) are sequentially laminated on at least one surface of a substrate, X) and the primer layer (Y) form a bond (xy), and the primer layer (Y) and the surface layer (Z) form a bond (yz). It is related with the hard coat film characterized by these.

  Since the hard coat film of the present invention can maintain surface characteristics such as antifouling property and anti-fogging property for a long period of time, it is provided in various image display devices such as portable electronic devices such as smartphones and tablet terminals, televisions, and personal computers. It can be suitably used as a hard coat film for protecting the surface of a display.

  The hard coat film of the present invention is a hard coat film in which a hard coat layer (X), a primer layer (Y), and a surface layer (Z) are sequentially laminated on at least one surface of a substrate, The layer (X) and the primer layer (Y) form a bond (xy), and the primer layer (Y) and the surface layer (Z) form a bond (yz). It is characterized by being. The hard coat film of the present invention having the above-described configuration is a surface function compared to a hard coat film in which a hard coat layer (X), a primer layer (Y), and a surface layer (Z) are simply laminated on the surface of a substrate. The effect of can be maintained for a long time.

  Examples of the hard coat film of the present invention include (1) a structure in which a hard coat layer (X), a primer layer (Y), and a surface layer (Z) are sequentially laminated on one surface of a substrate, A structure in which a hard coat layer (X), a primer layer (Y), and a surface layer (Z) are sequentially laminated on one surface of the material, and a hard coat layer (X) is laminated on the other surface of the base material, etc. The thing which consists of is mentioned.

  The hard coat film having the above-described configuration (1) can improve the good workability and post-workability when used as a hard coat film having an adhesive layer, which will be described later, and its production cost. Can be suppressed.

  On the other hand, the hard coat film having the configuration (2) further improves the surface hardness and has further excellent durability. Moreover, the said hard coat film can suppress generation | occurrence | production of the curvature resulting from the cure shrinkage at the time of forming hard coat layer (X).

  As the hard coat film, a film having a thickness of 300 μm or less is preferably used, a film having a thickness of 10 μm to 200 μm is more preferable, and a film having a thickness of 50 μm to 150 μm is used. More preferably, a thickness of 80 μm to 140 μm is more preferable, and a thickness of 100 μm to 135 μm is particularly preferable. If the hard coat film having the thickness in the above range is used, for example, for displays of various image display devices, the image display device can be made thin and have high surface hardness.

  The hard coat film of the present invention is a film in which a hard coat layer (X), a primer layer (Y), and a surface layer (Z) are sequentially laminated, and a bond is formed between the layers.

  Specifically, as the hard coat film, a film in which the hard coat layer (X) and the primer layer (Y) form a bond (xy) is used. Thereby, the hard coat film which can maintain the effect of surface function for a long period of time can be obtained.

  Examples of the bond (xy) include a carbon-carbon bond formed by radical polymerization of a (meth) acryloyl group. Specifically, the bond (xy) is formed by radical polymerization of the (meth) acryloyl group derived from the hard coat layer (X) and the (meth) acryloyl group derived from the primer layer (Y). The bond formed.

  Further, as the hard coat film, a film in which the primer layer (Y) and the surface layer (Z) form a bond (yz) is used. Thereby, the hard coat film which can maintain the effect of surface function for a long period of time can be obtained.

  Examples of the bond (yz) include a bond composed of a silicon atom and an oxygen atom or a titanium atom and an oxygen atom. Specifically, as the bond (yz), a functional group such as an alkoxysilyl group or a silanol group derived from the primer layer (Y), an alkoxysilyl group or a silanol group derived from the surface layer (Z), Examples thereof include a bond formed by a reaction with a titanol group or a hydroxyl group.

  In addition, it is preferable to use a highly transparent film as the hard coat film because good visibility can be secured when applied to a display of an image display device. The total light transmittance of the hard coat film is preferably 85% or more, more preferably 88% or more, and particularly preferably 90% or more.

  The hard coat film has a pencil hardness of 2H or more, and imparts a level of durability that prevents the occurrence of surface dents and scratches even when pressed with a touch pen, for example. And, it is preferable for maintaining the effect of the surface function for a longer period of time.

[Base material]
As a base material which comprises the hard coat film of this invention, it is highly transparent and what is generally used as a base material of the optical hard coat film can be selected suitably, and can be used.

  As said base material, a polyester resin film, a triacetyl cellulose film, an acrylic resin film, an alicyclic structure containing thermoplastic resin film, a polycarbonate resin film etc. can be used, for example.

  As the substrate, a substrate composed only of the resin film mentioned above can be used, but for the purpose of further improving the adhesion with the hard coat layer (X), the surface of the resin film is used. It is also possible to use a substrate having an easy adhesion layer.

  In addition, as the base material, the surface of the resin film is subjected to a roughening process by a sandblasting method, a solvent processing method, or the like for the purpose of further improving the adhesion to the hard coat layer (X). Discharge treatment, atmospheric pressure plasma treatment, chromic acid treatment, flame treatment, hot air treatment, ozone / ultraviolet irradiation treatment, oxidation treatment, or the like can be used.

  Moreover, it is preferable to use the transparent base material whose total light transmittance is 88% or more as said base material, and it is more preferable to use the transparent base material which is 90% or more. In the present invention, by setting the total light transmittance within the above range, even when the hard coat layer (X) is provided on one or both sides of the transparent substrate, the transmittance is excellent, and good visual recognition when applied to an image display device. Sex can be obtained.

  The substrate preferably has a thickness in the range of 50 μm to 150 μm, and more preferably in the range of 75 μm to 125 μm in terms of suppressing the occurrence of warpage of the hard coat film.

[Hard coat layer (X)]
Examples of the hard coat layer (X) constituting the hard coat film of the present invention include those formed using a hard coat agent containing an active energy ray-curable composition.

  As a hard coat agent that can be used for forming the hard coat layer (X), it is easy to obtain and handle and it is easy to control the characteristics of the hard coat layer (X). It is preferable to use a coating agent.

  The (meth) acrylate is a urethane that suppresses curing shrinkage when the hard coat layer (X) is formed, and forms a hard coat layer having high surface hardness and excellent durability. It is more preferable to use (meth) acrylate (A).

  As the urethane (meth) acrylate (A), various urethane (meth) acrylates can be used, and in particular, urethane (meth) acrylate having 4 or more (meth) acryloyl groups in the molecule is used. It is preferable.

  As the urethane (meth) acrylate having 4 or more (meth) acryloyl groups in the molecule, it is preferable to use, for example, those obtained by reacting polyisocyanate and (meth) acrylate having a hydroxyl group.

  Examples of the polyisocyanate include aliphatic polyisocyanates such as hexamethylene diisocyanate, lysine diisocyanate, and lysine triisocyanate; norbornane diisocyanate, isophorone diisocyanate, methylene bis (4-cyclohexyl isocyanate), 1,3-bis (isocyanatomethyl) cyclohexane, Alicyclic polyisocyanates such as 2-methyl-1,3-diisocyanatocyclohexane and 2-methyl-1,5-diisocyanatocyclohexane can be used.

  As said polyisocyanate, the trimer of the said aliphatic polyisocyanate or alicyclic polyisocyanate can also be used.

  As the polyisocyanate, hexamethylene diisocyanate, which is an aliphatic diisocyanate, norbornane diisocyanate, which is an alicyclic diisocyanate, or isophorone diisocyanate can be used to obtain a hard coat film with further excellent durability such as scratch resistance. Is preferable.

  Examples of the (meth) acrylate having a hydroxyl group that can be used in the production of the urethane (meth) acrylate (A) include trimethylolpropane di (meth) acrylate, ethylene oxide-modified trimethylolpropane di (meth) acrylate, and propylene oxide. Modified trimethylolpropane di (meth) acrylate, glycerin di (meth) acrylate, bis (2- (meth) acryloyloxyethyl) hydroxyethyl isocyanurate, pentaerythritol tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, Dipentaerythritol penta (meth) acrylate or the like can be used alone or in combination of two or more.

  As the (meth) acrylate having a hydroxyl group, it is possible to use pentaerythritol tri (meth) acrylate or dipentaerythritol penta (meth) acrylate, and the hard coat layer (X) is more excellent in durability such as scratch resistance. It is preferable when obtaining the hard coat film provided with.

  The urethane (meth) acrylate (A) can be produced by subjecting the polyisocyanate and the (meth) acrylate having a hydroxyl group to a urethanization reaction in a conventional manner in the presence of a urethanization catalyst.

  Examples of the urethanization catalyst include amine compounds such as pyridine, pyrrole, triethylamine, diethylamine, and dibutylamine; phosphorus compounds such as triphenylphosphine and triethylphosphine; dibutyltin dilaurate, octyltin trilaurate, octyltin diacetate, and dibutyltin. Examples thereof include organic tin compounds such as diacetate and tin octylate, and organic zinc compounds such as zinc octylate.

  The urethane (meth) acrylate (A) obtained by the above method can be used alone or in combination of two or more.

  As the urethane (meth) acrylate (A), it is preferable to use a combination of a urethane acrylate obtained using norbornane diisocyanate as the polyisocyanate and a urethane acrylate obtained using isophorone diisocyanate as the polyisocyanate. . By setting it as such a combination, the hard coat film excellent in high surface hardness and durability can be obtained, suppressing the curvature of the hard coat film by the cure shrinkage at the time of hardening.

  As a hard-coat agent which can be used for formation of the said hard-coat layer (X), what contains other (meth) acrylates other than the said urethane (meth) acrylate (A) can be used.

  As said other (meth) acrylate, the polyfunctional (meth) acrylate (B) which has a 3 or more (meth) acryloyl group in a molecule | numerator is mentioned, for example.

  Examples of the polyfunctional (meth) acrylate (B) include trimethylolpropane tri (meth) acrylate, ethylene oxide-modified trimethylolpropane tri (meth) acrylate, propylene oxide-modified trimethylolpropane tri (meth) acrylate, and ditrimethylolpropane. Tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, tris (2- (meth) acryloyloxyethyl) isocyanurate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri ( (Meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol Ruhekisa etc. (meth) acrylate, it can be combined used alone or two or more.

  The polyfunctional (meth) acrylate (B) has a (meth) acryloyl group equivalent of 50 g / eq. For further improving durability such as scratch resistance of the hard coat layer (X). -200 g / eq. In the range of 70 g / eq. -150 g / eq. In the range of 80 g / eq. -120 g / eq. It is more preferable to use the thing of the range. Examples of the polyfunctional (meth) acrylate having a (meth) acryloyl group equivalent within the above range include pentaerythritol tetraacrylate (acryloyl group equivalent: 88 g / eq.), Dipentaerythritol hexa (meth) acrylate (acryloyl group equivalent: 118 g / eq.) and the like.

  The polyfunctional (meth) acrylate (B) is preferably used in combination with the urethane (meth) acrylate (A).

  The mass ratio [(A) / (B)] of the urethane (meth) acrylate (A) and the polyfunctional (meth) acrylate (B) has durability such as scratch resistance of the hard coat layer (X). In order to further improve, it is preferably in the range of 90/10 to 10/90, more preferably in the range of 80/20 to 20/80, and in the range of 75/25 to 25/75. Is more preferable.

The total amount of the urethane acrylate (A) and the polyfunctional (meth) acrylate (B) used may be 10 parts by mass to 99.95 parts by mass with respect to 100 parts by mass of the nonvolatile content of the hard coat agent. Preferably, it is 20 to 99.5 parts by mass.

  As a hard coat agent that can be used for forming the hard coat layer (X), in addition to those described above, mono ((meth) acryloyl group-containing mono ( Those containing other (meth) acrylates such as (meth) acrylate and di (meth) acrylate having two (meth) acryloyl groups in the molecule can be used. They are preferably used at 40 parts by mass or less, and at 20 parts by mass or less, with respect to 100 parts by mass in total of the urethane (meth) acrylate (A) and the polyfunctional (meth) acrylate (B). It is more preferable.

  As a hard-coat agent which can be used for formation of the said hard-coat layer (X), what contains the photoinitiator which can start hardening reaction by irradiating an active energy ray can be used.

  Examples of the photopolymerization initiator include intramolecular cleavage type photopolymerization initiators and hydrogen abstraction type photopolymerization initiators. Examples of the intramolecular cleavage type photopolymerization initiator include diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, oligo [2-hydroxy-2-methyl-1- [4- ( 1-methylvinyl) phenyl] propanone], benzyldimethyl ketal, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy -2-propyl) ketone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-2-morpholino (4-thiomethylphenyl) propan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) ) -Acetophenone compounds such as butanone; benzoin, benzoin methyl ether, ben Benzoin such as inisopropyl ether; Acylphosphine oxide compounds such as 2,4,6-trimethylbenzoin diphenylphosphine oxide and bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide; benzyl, methylphenylglyoxyester, etc. Is mentioned.

  On the other hand, examples of the hydrogen abstraction type photopolymerization initiator include benzophenone, methyl 4-phenylbenzophenone, o-benzoylbenzoate, 4,4′-dichlorobenzophenone, hydroxybenzophenone, 4-benzoyl-4′-methyl-diphenyl sulfide. Acrylated benzophenone, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, 3,3′-dimethyl-4-methoxybenzophenone, 2,4,6-trimethylbenzophenone, 4-methylbenzophenone Benzophenone compounds such as 2-isopropylthioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, etc .; Michler-ketone, 4,4′-die Aminobenzophenone compounds such as ruaminobenzophenone; 10-butyl-2-chloroacridone, 2-ethylanthraquinone, 9,10-phenanthrenequinone, camphorquinone, 1- [4- (4-benzoylphenylsulfanyl) ) Phenyl] -2-methyl-2- (4-methylphenylsulfonyl) propan-1-one. These photopolymerization initiators can be used alone or in combination of two or more.

  Moreover, as the hard coat agent, one containing a photosensitizer can be used.

  Examples of the photosensitizer include tertiary amine compounds such as diethanolamine, N-methyldiethanolamine, and tributylamine, urea compounds such as o-tolylthiourea, sodium diethyldithiophosphate, s-benzylisothuronium-p-toluene. And sulfur compounds such as sulfonate.

  The amount of the photopolymerization initiator and photosensitizer used is preferably 0.05 parts by mass to 20 parts by mass, and 0.5 parts by mass to 100 parts by mass of the nonvolatile component of the hard coat agent. It is more preferable that it is 10 mass parts. In the case where ionizing radiation such as electron beam, α ray, β ray, and γ ray is used as the active energy ray, it is not necessary to use a photopolymerization initiator or a photosensitizer.

  As the hard coat agent, one diluted with an appropriate solvent can be used.

  Examples of the solvent include acetone, isobutyl alcohol, 2-propanol, isopentyl alcohol, ethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoethyl ether acetate, ethylene glycol mono-normal-butyl ether, ethylene glycol monomethyl ether, ortho -Dichlorobenzene, xylene, cresol, chlorobenzene, isobutyl acetate, isopropyl acetate, isopentyl acetate, ethyl acetate, normal-butyl acetate, normal-propyl acetate, normal-pentyl acetate, methyl acetate, cyclohexanol, cyclohexanone, 1,4 -Dioxane, dichloromethane, N, N-dimethylformamide, styrene, tetrachloroethylene, tetrahydrofuran, 1,1,1 Trichloroethane, toluene, normal hexane, 1-butanol, 2-butanol, methanol, methyl isobutyl ketone, methyl ethyl ketone, methyl cyclohexanol, methyl cyclohexanone, methyl-normal-butyl ketone, etc. may be used alone or in combination of two or more. it can.

  Further, as the hard coat agent, if necessary, a polymerization inhibitor, a surface conditioner, an antistatic agent, an antifoaming agent, a viscosity adjuster, a light resistance stabilizer, a weather resistance stabilizer, a heat resistance stabilizer, an ultraviolet absorber, Additives such as antioxidants, leveling agents, organic pigments, inorganic pigments, pigment dispersants, silica beads, organic beads; inorganic fillers such as silicon oxide, aluminum oxide, titanium oxide, zirconia, antimony pentoxide, etc. You can use what you want.

  The hard coat layer (X) formed using the hard coat agent preferably has a thickness of 3 μm to 25 μm, preferably 5 μm to 15 μm, and has durability such as scratch resistance and the like. For example, it is more preferable to obtain a hard coat film that is excellent in slipperiness and that can be used in, for example, an image display device that is highly demanded to be thin.

  Moreover, as said hard-coat layer (X), it is preferable to use what the water contact angle of the surface is 85 degrees or less, and it is more preferable to use what is 75 degrees or less. By using the hard coat layer (X) having a water contact angle in the above range, the adhesion between the hard coat layer (X) and the primer layer (Y) can be further improved, and the surface function can be extended for a long time. Sustainable hard coat film can be obtained.

  The hard coat layer (X) preferably has a pencil hardness of 2H or more when laminated on one side of the substrate, and more preferably 3H or more because of durability such as scratch resistance. It is more preferable when obtaining a more excellent hard coat film.

[Primer layer (Y)]
The primer layer (Y) constituting the hard coat film of the present invention is provided for the purpose of improving the adhesion between the hard coat layer (X) and the surface layer (Z).

  The primer layer (Y) can form a bond with both the hard coat layer (X) and the surface layer (Z).

  The primer layer (Y) can be formed using a primer agent comprising an active energy ray curable composition.

  As said primer agent, what contains the silane compound which has an alkoxy silyl group or a silanol group, for example can be used. Here, the alkoxysilyl group refers to a functional group in which an alkoxy group is bonded to a silicon atom, and the silanol group refers to a functional group in which a hydroxy group (hydroxyl group) is bonded to a silicon atom.

  When forming a layer having the alkoxysilyl group, silanol group, hydroxy group or the like as the surface layer (Z) described later, the primer agent includes a primer agent containing the silane compound having the alkoxysilyl group or silanol group. It is preferable to use it in order to form a bond (yz) at the interface between the primer layer (Y) and the surface layer (Z), and as a result, to obtain a hard coat film that can maintain the surface function for a long period of time.

  Examples of the silane compound include tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 2-hydroxyethyltrimethoxysilane, 2-hydroxyethyltriethoxysilane, 2-hydroxypropyltrimethoxysilane, 2-hydroxypropyltriethoxysilane, 3-hydroxypropyltrimethoxysilane, 3-hydroxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, Vinyltriacetoxysilane, allyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryl Xytrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane, 3- Isocyanatopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, 3- (meth) acryloxypropyltrimethoxysilane, 3- (meth) acryloxypropyltriethoxysilane 3-ureidopropyltrimethoxysilane, 3-ureidopropyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diethyl dimethoxysilane, may be used as diethyl diethoxy silane.

  As the silane compound, in particular, it is possible to use the silane compound (C) having a functional group capable of dehydration condensation such as the alkoxysilyl group or silanol group and a polymerizable unsaturated group. ) And the primer layer (Y), and a bond (yz) is formed between the primer layer (Y) and the surface layer (Z). It is preferable for obtaining a hard coat film that expresses a surface function and maintains the surface function for a long period of time.

  Examples of the silane compound (C) include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetoxysilane, allyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3- Methacryloxytrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane and the like can be used.

  The silane compound (C) is preferably contained in an amount of 0.1 to 80 parts by mass, more preferably 0.5 to 70 parts by mass with respect to 100 parts by mass of the nonvolatile content of the primer agent. More preferably, 1 part by mass to 60 parts by mass are included.

  As a primer agent that can be used for forming the primer layer (Y), in addition to those described above, those containing other components, for example, an active energy ray-curable compound such as (meth) acrylate, as necessary. Can be used.

  As the (meth) acrylate, for example, it is possible to use a polyfunctional (meth) acrylate (D) having three or more (meth) acryloyl groups in the molecule for high hardness and durability such as scratch resistance. It is possible to obtain a hard coat film which is excellent and can sustain effects such as antifouling properties for a long period of time.

  Examples of the polyfunctional (meth) acrylate (D) include trimethylolpropane tri (meth) acrylate, ethylene oxide modified trimethylolpropane tri (meth) acrylate, propylene oxide modified trimethylolpropane tri (meth) acrylate, and ditrimethylolpropane. Tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, tris (2- (meth) acryloyloxyethyl) isocyanurate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri ( (Meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol Ruhekisa etc. (meth) acrylate, it can be combined used alone or two or more.

  The polyfunctional (meth) acrylate has a (meth) acryloyl group equivalent of 50 g / eq. For further improving durability such as scratch resistance of the primer layer (Y). It is preferable to use the above, and 70 g / eq. It is more preferable to use what is above, 80 g / eq. It is more preferable to use the above.

  Specific examples of the polyfunctional (meth) acrylate include pentaerythritol tetraacrylate (acroyl group equivalent: 88 g / eq.), Dipentaerythritol hexa (meth) acrylate (acroyl group equivalent: 118 g / eq.), And the like. .

  The polyfunctional (meth) acrylate is preferably contained in an amount of 30 to 95 parts by mass, more preferably 35 to 85 parts by mass with respect to 100 parts by mass of the nonvolatile content of the primer agent. More preferably, it is contained in an amount of 75 to 75 parts by mass.

  As a primer agent that can be used for forming the primer layer (Y), those containing various urethane (meth) acrylates can be used as the (meth) acrylate. As said urethane (meth) acrylate, the thing similar to the urethane (meth) acrylate (A) illustrated as what can be used for manufacture of the said hard-coat layer (X) can be used.

  The mass ratio [silane compound / active energy ray curable resin composition] of the silane compound and the active energy ray curable resin composition such as the polyfunctional (meth) acrylate and the urethane (meth) acrylate is the primer. By further improving the adhesion between the layer (Y) and the surface layer (Z), the durability of the hard coat film, such as scratch resistance, is further improved, and the surface function can be sustained for a long period of time. In addition, the range of 5/95 to 95/5 is preferable.

  As a primer agent that can be used for forming the primer layer (Y), a primer agent containing a photopolymerization initiator capable of initiating a curing reaction by irradiation with an active energy ray can be used.

  As said photoinitiator, the thing similar to the photoinitiator illustrated as what can be used when forming the said hard-coat layer (X) can be used.

  As the primer agent, one containing a photosensitizer can be used.

  As the photosensitizer, the same photosensitizers exemplified as those usable when forming the hard coat layer (X) can be used.

  The usage-amount of the said photoinitiator and a photosensitizer is 0.05 mass part-20 mass parts with respect to 100 mass parts of non-volatile components in the active energy ray-curable composition contained in the said primer agent, respectively. It is preferable that it is 1 to 15 parts by mass. In the case where ionizing radiation such as electron beam, α ray, β ray, and γ ray is used as the active energy ray, it is not necessary to use a photopolymerization initiator or a photosensitizer.

  The primer agent may be a polymerization inhibitor, a surface conditioner, an antistatic agent, an antifoaming agent, a viscosity modifier, a light resistance stabilizer, a weather resistance stabilizer, a heat resistance stabilizer, an ultraviolet absorber, an oxidation agent, if necessary. Contains additives such as inhibitors, leveling agents, organic pigments, inorganic pigments, pigment dispersants, silica beads, and organic beads; inorganic fillers such as silicon oxide, aluminum oxide, titanium oxide, zirconia, and antimony pentoxide Things can be used.

  The primer layer (Y) formed using the primer agent preferably has a thickness of 0.1 μm to 3 μm, more preferably 0.5 μm to 2 μm, and more preferably 0.8 μm to A thickness of 1.2 μm is more preferable for obtaining a hard coat film that can sustain the effect of the surface function for a long period of time and can be used in, for example, an image display device that is highly demanded of thinning.

  The primer layer (Y) may be heat-treated in a water vapor atmosphere or an atmosphere containing a small amount of water for the purpose of hydrolyzing the alkoxy group of the silane compound in which the alkoxysilyl group is directly bonded to the silicon atom.

[Surface layer (Z)]
The surface layer (Z) which comprises the hard coat film of this invention is a layer laminated | stacked on the surface of the said primer layer (Y), and provides various surface functions to the said hard coat film.

  The surface layer (Z) forms a bond (yz) with the primer layer (Y). Thereby, the adhesion between the layers can be increased, and the effect of the surface function can be maintained for a long time.

  Examples of the surface function imparted by the surface layer (Z) include antifouling property and anti-fogging property capable of preventing adhesion of dirt due to fingerprints and the like.

  The surface layer (Z) can be formed using various coating agents. For example, when forming the antifouling surface layer, for example, it is formed by using a coating agent containing a fluorine compound having a functional group capable of forming a bond with the primer layer (Y). Can do.

  As the fluorine compound, it is preferable to use a fluorine compound having an alkoxysilyl group or a silanol group at the terminal as a functional group capable of forming a bond with the primer layer (Y).

  As the fluorine-based compound having an alkoxysilyl group or silanol group at the terminal, for example, it has an alkoxysilyl group or silanol group at the terminal and a polyperfluorocarbon, for example, in order to impart higher slipperiness by the hard coat film of the present invention. It is preferable to use a fluorine-based compound having a fluoropolyether chain.

  Examples of the polyperfluoropolyether chain include those having a structure in which a divalent fluorinated alkylene group having 1 to 6 carbon atoms and oxygen atoms are alternately connected.

  Examples of the polyperfluoropolyether chain include those represented by the following structural formula (1).

In the general formula (1), X is the following formulas (1-1) to (1-3). X may be one of the following formulas (1-1) to (1-3), or two or more of the following formulas (1-1) to (1-3). You may have. For example, the structure having two or more of the following formulas (1-1) to (1-3) as the _{X, - (CF 2 CF 2} -O) n- (CF 2 -O) n- at the indicated Such a structure is mentioned. In the case where two or more types of structures represented by the formulas (1-1) to (1-3) are included as X, it has a random structure or a block structure composed of structural units of — (X—O) —. Also good. N is an integer of 2 to 200 representing a repeating unit.

(In the formula, a is an integer of 1 to 6.)

  As the fluorine-based compound, it is possible to use a compound having an alkoxysilyl group or a silanol group together with a fluorine chain such as the perfluoropolyether chain, between the primer layer (Y) and the surface layer (Z). As a result, a hard coat film having excellent scratch resistance, slipperiness and antifouling properties and excellent antifouling properties can be obtained for a long period of time. Examples of the bond (yz) include a bond composed of a silicon atom and an oxygen atom, such as a —Si—O—Si— bond.

  Specific examples of the fluorine-based compound capable of forming the bond (yz) include Optool DSX manufactured by Daikin Industries, Ltd., and trade names “KY-164” and “KY-130” manufactured by Shin-Etsu Chemical Co., Ltd. "KY-108", "X-71-190" etc. are mentioned.

  As content of the said fluorine-type compound, it is preferable that it is 80 mass parts-100 mass parts with respect to 100 mass parts of non volatile matters of the coating agent which forms the said surface layer (Z), and 90 mass parts-100 mass parts. It is more preferable that it is 95 mass parts-100 mass parts.

  Further, when forming a surface layer having anti-fogging properties as the surface layer (Z), for example, a compound having a functional group capable of forming a bond with the primer layer (Y) and titanium oxide. The containing coating agent can be used.

  As the compound, for example, a compound having an alkoxysilyl group, a silanol group, or a titanol group as a functional group capable of forming a bond (yz) with the primer layer (Y) can be used.

  Examples of the bond (yz) include a bond composed of a silicon atom and an oxygen atom, or a titanium atom and an oxygen atom, and specifically, a —Si—O—Si— bond or a —Ti—O—Si— bond. Is mentioned.

  As content of the said compound, it is preferable that it is 50-100 mass parts with respect to 100 mass parts of non volatile matters of the coating agent which forms the said surface layer (Z), and is 60 mass parts-100 mass parts. It is more preferable.

  As the titanium oxide, in addition to titanium oxide, what is generally called hydrous titanium oxide, hydrated titanium oxide, metatitanic acid, orthotitanic acid, titanium hydroxide, or the like can be used.

  Examples of the titanium oxide include (3) those obtained by heating and hydrolyzing titanium compounds such as titanium sulfate, titanyl sulfate, titanium chloride, and titanium alkoxide, and (4) mixing the titanium compound and an alkali component. Then, those obtained by neutralization, (5) those obtained by vapor phase oxidation of titanium chloride, titanium alkoxide or the like can be used.

  As said titanium oxide, what was obtained by further baking or hydrothermally treating the titanium oxide obtained in said (3) or (4) can also be used.

  As the titanium oxide, it is preferable to use the titanium oxide obtained in the above (3) in order to obtain a high hydrophilic function.

  As the titanium oxide, use of a sol state is preferable because a surface layer (Z) excellent in surface smoothness can be formed.

  Specific examples of the titanium oxide capable of forming the bond (yz) include “High Titanium TY-100”, “High Titanium A-1”, “High Titanium ABF-1”, “ABFS-1”, “Toa Gosei Co., Ltd.” ABFS-15 "and the like.

  As said titanium oxide, it is preferable to use what has an average particle diameter of 1 nm-500 nm, It is more preferable to use what has an average particle diameter of 1 nm-100 nm, and it has an average particle diameter of 1 nm-50 nm. It is more preferable to use a material having an average particle diameter of 1 nm to 10 nm, and it is particularly preferable to form a smooth surface layer (Z).

  As said titanium oxide, it is preferable to use in the range of 1 mass part-100 mass parts with respect to 100 mass parts of non volatile matters of the coating agent which forms the said surface layer (Z), 90 mass parts-100 mass parts. It is more preferable to use within the range, and it is even more preferable to use within the range of 95 to 100 parts by mass.

  As a coating agent that can be used for forming the surface layer (Z), in addition to the various compounds described above, those containing a solvent or the like can be used as necessary.

  Examples of the solvent include a fluorine-modified aliphatic hydrocarbon solvent such as perfluoroheptane; a fluorine-modified aromatic hydrocarbon solvent such as m-xylene hexafluoride when used as a coating agent containing the fluorine compound. Solvents: Fluorine-modified ether solvents such as hydrofluoroether, methyl perfluorobutyl ether and perfluoro (2-butyltetrahydrofuran); Fluorine-modified alkylamine solvents such as perfluorotributylamine; Petroleum benzine, mineral spirits, toluene, xylene, etc. Hydrocarbon solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; alcohol solvents such as methanol, ethanol, and 2-propanol; and ester solvents such as ethyl acetate and butyl acetate. It can be.

  Among these, m-xylene hexafluoride, hydrofluoroether, perfluoro (2-butyltetrahydrofuran), perfluorotributylamine, etc. are used to maintain the good wettability of the coating agent containing the fluorine compound. It is preferable to do.

  Examples of the solvent include hydrocarbon solvents such as petroleum benzine, mineral spirits, toluene and xylene; ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone when used for the coating agent containing titanium oxide; Alcohol solvents such as methanol, ethanol and 2-propanol; ester solvents such as ethyl acetate and butyl acetate; water alone or a mixed solvent of water and a water-soluble solvent can be used. Among them, it is preferable to use water alone, methanol, ethanol, 2-propanol, and a mixture of water and a water-soluble solvent in order to obtain good dispersibility of the titanium oxide.

  As the coating agent, in addition to those described above, those containing a condensation catalyst can be used as necessary.

  Examples of the condensation catalyst include organic titanates such as tetrabutyl titanate and tetraisopropyl titanate; organic titanium chelate compounds such as diisopropoxy bis (ethyl acetoacetate) titanium and diisopropoxy bis (ethyl acetoacetate) titanium; Organic aluminum compounds such as aluminum tris (acetylacetonate) and aluminum tris (ethylacetoacetate); organic zirconium compounds such as zirconium tetra (acetylacetonate) and zirconium tetrabutyrate; dibutyltin dioctoate, dibutyltin dilaurate, dibutyltin di ( 2-ethylhexanoate), dioctyltin dilaurate, dioctyltin diacetate, dioctyltin dioctoate, etc. Products; metal salts of organic carboxylic acids such as tin naphthenate, tin oleate, tin butyrate, cobalt naphthenate, zinc stearate; amine compounds such as hexylamine and dodecylamine phosphate; and salts thereof; benzyltriethylammonium acetate, etc. Quaternary ammonium salts; alkaline metal lower fatty acid salts such as potassium acetate and lithium nitrate; dialkylhydroxylamines such as dimethylhydroxylamine and diethylhydroxylamine; organosilicon compounds containing guanidyl groups such as tetramethylguanidylpropyltrimethoxysilane Organic acids (such as acetic acid and methanesulfonic acid) and inorganic acids (such as hydrochloric acid and sulfuric acid) can be used alone or in combination of two or more.

  As the curing catalyst, acetic acid, tetra n-butyl titanate, or dibutyltin diacetate is preferably used. In general, the curing catalyst is preferably used in the range of 0.01 to 20 parts by mass, and in the range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the fluorine compound. preferable.

  The surface layer (Z) formed using the coating agent has a thickness of 0.001 μm to 1 μm in order to suppress interference fringes of the hard coat film and to give a more excellent surface function. The thickness is preferably 0.002 μm to 0.5 μm.

  The hard coat film of the present invention includes, for example, (i) a step of forming a hard coat layer (X) on the at least one surface of the substrate using the hard coat agent, and (ii) the hard coat layer (X). Forming a primer layer (Y) on the surface of the primer layer using the primer agent, and (iii) forming a surface layer (Z) on the surface of the primer layer (Y) using the coating agent or the like. It can manufacture by passing through a process.

  In addition, after forming the uncured or semi-cured primer layer (Y ′) on the surface of the uncured or semi-cured hard coat layer (X ′) using the primer agent, the active energy rays are irradiated. The hard coat layer (X) and the primer layer (Y) are preferably cured together. Thereby, a bond (xy) can be formed between the hard coat layer (X) and the primer layer (Y), and the effects of various surface functions can be maintained for a long time.

  First, the step (i) will be described.

  Specifically, the method of forming the hard coat layer (X) by the step (i) is a method in which the hard coat agent is applied to and dried on a part or all of one side or both sides of the substrate. Can be mentioned.

  Examples of the method for applying the hard coating agent to one or both sides of the substrate include die coating, micro gravure coating, gravure coating, roll coating, comma coating, air knife coating, kiss coating, spray coating, and delivery. Examples of the method include coating, dip coating, spinner coating, wheeler coating, brush coating, solid coating by silk screen, wire bar coating, and flow coating.

  As the curing method, for example, if the hard coating agent contains an active energy ray-curable composition, a method of applying the hard coating agent and irradiating the dried application surface with an active energy ray and curing it may be mentioned. It is done.

  Examples of the active energy rays include ionizing radiation such as ultraviolet rays, electron beams, α rays, β rays, and γ rays.

  As an apparatus for irradiating the active energy ray, for example, in the case of ultraviolet rays, the generation source thereof is a low pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, an electrodeless lamp (fusion lamp), a chemical lamp, a black light. Examples include lamps, mercury-xenon lamps, short arc lamps, helium / cadmium lasers, argon lasers, sunlight, and LEDs.

  When producing the hard coat film of the present invention, the hard coat layer (X) is formed on the surface of the substrate by the above-described method, and then the primer layer (Y) and the surface layer (Z) described later are laminated in order. However, from the viewpoint of obtaining high adhesion at the interface between the hard coat layer (X) and the primer layer (Y), the hard coat agent is applied to the surface of the substrate and dried, and then the active energy The hard coat layer (X ′) in an uncured or semi-cured state is formed by not irradiating a line, or not irradiating an active energy ray in a sufficient amount for complete curing, and then a primer layer (Y) and The hard coat film may be produced by sequentially laminating the surface layer (Z). In this case, the hard coat layer (X ′) can be fully cured by active energy rays irradiated when forming the primer layer (Y) to form the hard coat layer (X).

  The surface of the hard coat layer (X) may be subjected to corona treatment, plasma treatment or the like in order to further improve interlayer adhesion when laminated with a primer layer (Y) described later.

  Next, the step (ii) will be described.

  In the step (ii), the primer agent is applied to the surface of the hard coat layer (X) or the hard coat layer (X ′) formed in the step (i), dried, and cured.

  Examples of the method for applying the primer agent include die coating, micro gravure coating, gravure coating, roll coating, comma coating, air knife coating, kiss coating, spray coating, transfer coating, dip coating, spinner coating, wheeler coating, brush coating, Examples of the method include solid coating using a silk screen, wire bar coating, and flow coating.

  As the curing method, for example, if the primer agent contains an active energy ray-curable composition, a method of irradiating and curing an active energy ray on the coated surface after applying the primer agent and drying it may be mentioned.

  Examples of the active energy rays include ionizing radiation such as ultraviolet rays, electron beams, α rays, β rays, and γ rays.

  As an apparatus for irradiating the active energy ray, for example, in the case of ultraviolet rays, the generation source thereof is a low pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, an electrodeless lamp (fusion lamp), a chemical lamp, a black light. Examples include lamps, mercury-xenon lamps, short arc lamps, helium / cadmium lasers, argon lasers, sunlight, and LEDs.

  In addition, when the primer agent is applied to the surface of the uncured or semi-cured hard coat layer (X ′), the hard coat is irradiated by irradiating active energy rays to the application surface of the primer agent. It is preferable to form the layer (X) and the primer layer (Y) in order to further improve the adhesion between the layers and maintain the effect of the surface function for a long period of time.

  Next, the step (iii) will be described.

  The step (iii) is a step of forming the surface layer (Z) by applying and drying the coating agent on the surface of the primer layer (Y) formed in the step (ii).

  As a method of laminating the surface layer (Z) on the primer layer (Y), for example, the coating agent or the like is applied to the primer layer (Y), dried to remove the solvent, and then subjected to heat treatment to perform surface treatment. The method of forming a layer (Z) is mentioned. As the treatment temperature at this time, 20 ° C. or more is sufficient, but a higher temperature is used for the purpose of promptly forming a bond (yz) at the interface between the primer layer (Y) and the surface layer (Z). It is also possible to process with. For example, the temperature is preferably treated in an environment of 40 ° C. or higher, and more preferably in an environment of 60 ° C. or higher.

  Examples of the method for applying the coating agent on the primer layer (Y) include die coating, micro gravure coating, gravure coating, roll coating, comma coating, air knife coating, kiss coating, spray coating, transfer coating, dip coating, and spinner. Examples include coating, wheeler coating, brush coating, silk screen solid coating, wire bar coating, flow coating, and vacuum deposition.

  Further, the alkoxysilyl group contained in the coating agent or the like can be hydrolyzed in advance. Silanol groups generated by hydrolysis are dehydrated and condensed between a plurality of molecules to generate Si-O-Si. Dehydration condensation proceeds quickly and oligomers are produced. It may be cured after hydrolysis so that the dehydration condensation proceeds sufficiently. By using the oligomer hydrolyzed and partially condensed in this way, the curing time until the coating agent is cured and the surface layer (Z) is formed can be shortened.

  The hard coat film of the present invention obtained by the above method may be any structure as long as the surface layer (Z) is exposed on at least a part of the surface layer, and has an appropriate layer in addition to the above structure. Also good.

  The hard coat film of the present invention may have a decorative layer or an adhesive layer on a part or all of one side or both sides. The hard coat film of the present invention in which the decorative layer is provided in part or in whole can be used as a decorative film. In addition, the hard coat film of the present invention in which the pressure-sensitive adhesive layer is partially or entirely provided can be used as a protective film.

  Examples of the decorative layer include those composed of characters, graphics, symbols, and frame-like borders for the purpose of providing concealment and design.

[Decoration layer]
The hard coat film of the present invention may be used as a decorative film by providing a decorative layer. The decorative layer can be provided on the hard coat film by general printing. Examples of the printing method include silk printing, screen printing, thermal transfer printing, and gravure printing.

  The decorative layer is not particularly limited as long as it imparts various design properties to the hard coat film, for example, characters and figures visually recognized around the image display unit when used as an image display panel, or Examples thereof include a black bordered decorative layer provided in a frame shape on the image display unit.

  As thickness of a decoration layer, 30 micrometers or less are preferable, 15 micrometers or less are more preferable, and 10 micrometers or less are especially preferable. It becomes easy to obtain suitable designability by setting it as the decoration layer of the said thickness.

  Although a decoration layer can be provided in the arbitrary location of the single side | surface or both surfaces of a hard coat film, when providing on a surface layer (Z), it is provided so that a part of surface layer (Z) may be exposed. Moreover, when using it for the display of an image display apparatus, it is normally provided in places other than an image display part.

[Adhesive layer]
When the surface layer (Z) is provided only on one side or one side of the hard coat film of the present invention, an adhesive layer may be provided on the other side and used as a protective film. The pressure-sensitive adhesive layer can be provided by attaching a pressure-sensitive adhesive tape to the hard coat film or by directly applying a pressure-sensitive adhesive layer to the surface opposite to the surface layer (Z) of the hard coat film.

  The thickness of the adhesive layer is preferably in the range of 5 μm to 50 μm, more preferably in the range of 8 μm to 30 μm, and still more preferably in the range of 10 μm to 25 μm. In this invention, by making the thickness of an adhesive layer into the said range, it is excellent in adhesive reliability, and can maintain the surface hardness of a hard coat film not remarkably impaired.

  For the pressure-sensitive adhesive used in the pressure-sensitive adhesive layer used in the present invention, known acrylic, rubber-based, or silicone-based pressure-sensitive resins can be used. Among them, it is preferable to use an acrylic pressure-sensitive adhesive containing an acrylic polymer in order to reduce interference fringes and further improve the adhesion to the substrate, transparency, weather resistance, and the like. .

  As said acrylic polymer, what is obtained by superposing | polymerizing a (meth) acryl monomer can be used. As said (meth) acryl monomer, (meth) acrylate is mentioned, for example, It is preferable to use what contains the (meth) acrylate which has a C2-C14 alkyl group.

  Examples of the (meth) acrylate having an alkyl group having 2 to 14 carbon atoms include ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, sec-butyl acrylate, t-butyl acrylate, and n-hexyl. Acrylate, cyclohexyl acrylate, n-octyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate, isodecyl acrylate, lauryl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, sec -Butyl methacrylate, t-butyl methacrylate, n-hexyl methacrylate, cyclohexyl methacrylate Rate, n- octyl methacrylate, isooctyl methacrylate, 2-ethylhexyl methacrylate, isononyl methacrylate, isodecyl methacrylate, lauryl methacrylate.

  Among the above (meth) acrylates, it is preferable to use an alkyl (meth) acrylate having an alkyl group having 4 to 9 carbon atoms, and an alkyl acrylate having an alkyl group having 4 to 9 carbon atoms. More preferably, is used.

  As the alkyl acrylate having an alkyl group having 4 to 9 carbon atoms, n-butyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate, and ethyl acrylate are more preferable because it is easy to ensure suitable adhesive strength. .

  The (meth) acrylate having an alkyl group having 2 to 14 carbon atoms is preferably used in a range of 90% by mass to 99% by mass with respect to the total amount of the (meth) acrylic monomer, and is 90% by mass. It is more preferable to use in the range of ˜96% by mass because it is easy to secure a suitable adhesive force.

  As said acrylic polymer, what has polar groups, such as a hydroxyl group, a carboxyl group, an amide group, can be used, for example.

  The acrylic polymer can be produced by polymerizing a (meth) acrylic monomer containing a (meth) acrylic monomer having a polar group such as a hydroxyl group, a carboxyl group, or an amide group.

  Examples of the (meth) acrylate monomer having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, hydroxypropyl (meth) acrylate, Examples include caprolactone-modified (meth) acrylate, polyethylene glycol mono (meth) acrylate, and polypropylene glycol mono (meth) acrylate. Among these, 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate are preferably used.

  Examples of the (meth) acrylate monomer having a carboxyl group include acrylic acid, methacrylic acid, itaconic acid, maleic acid, crotonic acid, acrylic acid or methacrylic acid dimer, ethylene oxide-modified succinic acid acrylate, and the like. Can be mentioned. Among these, it is preferable to use acrylic acid.

  Examples of the (meth) acrylate monomer having an amide group include N-vinyl-2-pyrrolidone, N-vinylcaprolactam, acryloylmorpholine, acrylamide, N, N-dimethylacrylamide, and 2- (perhydrophthalimide-N. -Yl) ethyl acrylate and the like. Among these, it is preferable to use N-vinyl-2-pyrrolidone, N-vinylcaprolactam, and acryloylmorpholine.

  Examples of the other vinyl monomers having a polar group include vinyl acetate, acrylonitrile, maleic anhydride, itaconic anhydride and the like.

  The (meth) acrylic monomer having a polar group should be used in the range of 0.1% by mass to 20% by mass with respect to the total amount of the (meth) acrylic monomer used for the production of the acrylic polymer. It is preferable to use in the range of 1% by mass to 13% by mass, and to use in the range of 1.5% by mass to 8% by weight makes the cohesive strength, holding power, and adhesiveness within suitable ranges It is more preferable because it is easy to adjust.

  The acrylic polymer preferably has a weight average molecular weight of 400,000 to 1,400,000, more preferably 600,000 to 1,200,000, because the adhesive force can be easily adjusted to a specific range.

The weight average molecular weight can be measured by gel permeation chromatograph (GPC). More specifically, as a GPC measurement device, “SC8020” manufactured by Tosoh Corporation can be used to measure and obtain the following GPC measurement conditions based on polystyrene conversion values.
(GPC measurement conditions)
Sample concentration: 0.5% by mass (tetrahydrofuran solution)
Sample injection volume: 100 μL
・ Eluent: Tetrahydrofuran (THF)
・ Flow rate: 1.0 mL / min
Column temperature (measurement temperature): 40 ° C
Column: “TSKgel GMHHR-H” manufactured by Tosoh Corporation
・ Detector: Differential refraction

  As the pressure-sensitive adhesive, it is preferable to use a material containing a crosslinking agent in addition to the acrylic polymer in order to further increase the cohesive force.

  Examples of the crosslinking agent include isocyanate crosslinking agents, epoxy crosslinking agents, chelate crosslinking agents, and the like.

  The crosslinking agent is preferably used in the range where the gel fraction of the pressure-sensitive adhesive layer to be formed is 25% by mass to 80% by mass, and is used in the range where the gel fraction is 40% by mass to 75% by mass. It is more preferable that use in the range of 50% by mass to 70% by mass can suppress a decrease in surface pencil hardness when the protective film is attached to the substrate, and the adhesiveness is sufficient. can do. The gel fraction in the present invention is expressed as a percentage of the original mass by immersing the cured pressure-sensitive adhesive layer in toluene, measuring the mass after drying of the insoluble matter remaining after standing for 24 hours, and the original mass. Is.

  As the pressure-sensitive adhesive, one containing a tackifying resin can be used to further increase the adhesive force.

  The tackifier resin is preferably used in the range of 10 parts by mass to 60 parts by mass with respect to 100 parts by mass of the acrylic polymer. Furthermore, when importance is attached to adhesiveness, it is preferable to add in the range of 20 mass parts-50 mass parts.

  As said adhesive, what contains a well-known and usual additive other than the above can be used.

  As said additive, in order to improve the adhesiveness to a glass base material, for example, a silane coupling agent is added in 0.001 mass part-0.005 mass part with respect to 100 mass parts of adhesives. It is preferable. Furthermore, as necessary, plasticizers, softeners, fillers, pigments, flame retardants, and the like can be added as other additives.

[Embodiment]
Since the hard coat film of the present invention can maintain surface functions such as antifouling property and anti-fogging property for a long period of time, for example, an image display unit of an image display device such as a liquid crystal display (LCD) or an organic EL display, an electronic display It is suitable for use in protecting the image display unit of an image display device of a portable electronic terminal that is highly demanded to be miniaturized or thinned, such as a notebook, a mobile phone, a smartphone, a portable audio player, a mobile personal computer, and a tablet terminal. In such an image display device, for example, an image display module such as an LCD module or an organic EL module is included in the configuration, and a transparent panel for protecting the image display module is provided above the image display module. In this image display device, it is effective to prevent scratches and to prevent scattering when the transparent panel is damaged by being attached to the front or back surface of the transparent panel.

  Hereinafter, the present invention will be described in more detail with reference to examples.

(Synthesis Example 1: Synthesis of urethane acrylate (A1))
In a flask equipped with a stirrer, a gas introduction tube, a cooling tube, and a thermometer, 250 parts by mass of butyl acetate, 206 parts by mass of norbornane diisocyanate, 0.5 parts by mass of p-methoxyphenol, and 0.5 parts by mass of dibutyltin diacetate After charging and heating to 70 ° C. while blowing air, a mixture (mass ratio) of pentaerythritol triacrylate (hereinafter abbreviated as “PE3A”) and pentaerythritol tetraacrylate (hereinafter abbreviated as “PE4A”). 75/25 mixture) 795 parts by mass were added dropwise over 1 hour.

After completion of the dropwise addition, 3 hours at 70 ° C., the reaction was continued, by reacting further to the infrared absorption spectrum of 2250 cm ^-1 indicating the isocyanate group disappeared, butyl acetate containing a PE4A urethane acrylate (A1) A solution (non-volatile content 80 mass%, hereinafter abbreviated as “urethane acrylate (A1) solution”) was obtained. The molecular weight (calculated value) of the urethane acrylate (A1) was 802.

(Synthesis Example 2: Synthesis of urethane acrylate (A2))
In a flask equipped with a stirrer, a gas introduction tube, a cooling tube, and a thermometer, 254 parts by mass of butyl acetate, 222 parts by mass of isophorone diisocyanate, 0.5 parts by mass of p-methoxyphenol, 0.5 parts by mass of dibutyltin diacetate After charging and heating to 70 ° C., 795 parts by mass of a mixture of PE3A and PE4A (a mixture with a mass ratio of 75/25) was added dropwise over 1 hour.

After completion of the dropwise addition, 3 hours at 70 ° C., the reaction was continued, by reacting further to the infrared absorption spectrum of 2250 cm ^-1 indicating the isocyanate group disappeared, butyl acetate containing a PE4A urethane acrylate (A2) A solution (non-volatile content 80 mass%, hereinafter abbreviated as “urethane acrylate (A2) solution”) was obtained. The molecular weight (calculated value) of the urethane acrylate (A2) was 818.

(Synthesis Example 3: Synthesis of urethane acrylate (A3))
In a flask equipped with a stirrer, a gas introduction tube, a cooling tube, and a thermometer, 254 parts by mass of butyl acetate, 222 parts by mass of isophorone diisocyanate, 0.5 parts by mass of p-methoxyphenol, 0.5 parts by mass of dibutyltin diacetate After charging and heating to 70 ° C., 369 parts by mass of bis (acryloxyethyl) hydroxyethyl isocyanurate and 398 parts by mass of a mixture of PE3A and PE4A (mass ratio 75/25) were added dropwise over 1 hour. did.

After completion of the dropwise addition, 3 hours at 70 ° C., the reaction was continued, by reacting further to the infrared absorption spectrum of 2250 cm ^-1 indicating the isocyanate group disappeared, butyl acetate containing a PE4A urethane acrylate (A3) A solution (non-volatile content 80 mass%, hereinafter abbreviated as “urethane acrylate (A3) solution”) was obtained. The molecular weight (calculated value) of the urethane acrylate (A3) was 889.

(Synthesis Example 4: Synthesis of urethane acrylate (A4))
In a flask equipped with a stirrer, a gas introduction tube, a condenser and a thermometer, 549.1 parts by mass of a mixture of PEA3 and PEA4 (a mixture with a mass ratio of 60/40), 0.1 part by mass of dibutyltin diacetate, and a Sumitizer BHT [Sumitomo Chemical Co., Ltd., antioxidant] 0.6 parts by mass, methoquinone [Seiko Chemical Industry Co., Ltd., polymerization inhibitor] 0.1 parts by mass, and butyl acetate 160.0 parts by mass The temperature was gradually raised while mixing uniformly. Upon reaching 60 ° C., after adding 90.9 parts by mass of Desmodur H (Hexamethylene diisocyanate, NCO% = 50%) manufactured by Sumitomo Bayer Urethane Co., Ltd., by reacting at 80 ° C. for 5 hours, urethane acrylate ( A butyl acetate solution (non-volatile content 80 mass%, hereinafter abbreviated as “urethane acrylate (A4) solution”) containing A4) and PE4A was obtained.

(Preparation Example 1: Preparation of hard coating agent (1))
31.3 parts by mass of the urethane acrylate (A1) solution obtained in Synthesis Example 1, 31.3 parts by mass of the urethane acrylate (A2) solution obtained in Synthesis Example 2, and the urethane acrylate (A3) obtained in Synthesis Example 3 25 parts by mass of solution, 30 parts by mass of dipentaerythritol hexaacrylate and dipentaerythritol pentaacrylate (dipentaerythritol hexaacrylate / dipentaerythritol pentaacrylate = 60/40 (mass ratio)), photopolymerization initiator (BASF Japan) “Irgacure 184” manufactured by Co., Ltd., 1-hydroxycyclohexyl phenyl ketone) was uniformly stirred and then diluted with ethyl acetate to prepare a hard coating agent (1) having a nonvolatile content of 40% by mass. .

(Preparation Example 2: Preparation of hard coat agent (2))
After adding butyl acetate to the urethane acrylate (A4) solution obtained in Synthesis Example 4 to dilute the non-volatile content to 35%, a photopolymerization initiator (“Irgacure 184” manufactured by BASF Japan Ltd., 1 -Hydroxycyclohexyl phenyl ketone) A hard coat agent (2) was prepared by blending 3.2 parts by mass.

(Preparation Example 3: Preparation of primer agents (1) to (7))
Urethane acrylate (A1) solution, urethane acrylate (A2) solution, urethane acrylate (A3) solution, polyfunctional monomer (dipentaerythritol hexaacrylate / dipentaerythritol pentaacrylate = 60/40 (mass ratio))), silane coupling Agent (3-acryloxypropyltrimethoxysilane), photopolymerization initiator (“Irgacure 184” manufactured by BASF Japan Ltd., 1-hydroxycyclohexyl phenyl ketone), ethyl acetate, and 2-propanol in parts by mass shown in Table 1 below. Primer agents (1) to (7) were prepared by mixing.

(Preparation Example 4: Preparation of coating agent (1) for forming the surface layer)
“High Titanium ABF-1” manufactured by Toa Gosei Co., Ltd. (having a composite of titanium oxide ultrafine particles and tetraalkoxysilane, having a titanol group, a silanol group, and an alkoxysilyl group) was used as the coating agent (1).

(Preparation Example 5: Preparation of coating agent (2) for surface layer formation)
By diluting 1 part by mass of “X-71-190” manufactured by Shin-Etsu Chemical Co., Ltd. with 199 parts by mass of “Novec7200” manufactured by 3M, a coating agent (2) having a nonvolatile content of 0.1% by mass (alkoxysilyl group and silanol) Having a group).

Example 1
The hard coat agent (1) is applied on a polyester film (Toyobo Co., Ltd., Cosmo Shine A4300, thickness 100 μm) using a wire bar, dried at 80 ° C. for 1 minute, and then irradiated with ultraviolet rays in an air atmosphere. Using a device (“MIDN-042-C1” manufactured by Eye Graphics Co., Ltd., lamp: 120 W / cm, high-pressure mercury lamp), ultraviolet rays are irradiated at an irradiation light amount of 0.25 J / cm ² , thereby providing a 10 μm thick hardware. A film having a coat layer (x1) was obtained.

The primer agent (1) is applied to the surface of the hard coat layer (x1) of the obtained film using a wire bar and dried at 85 ° C. for 2 minutes, and then the same ultraviolet irradiation apparatus as above is used in an air atmosphere. By irradiating ultraviolet rays with an irradiation light quantity of 0.25 J / cm ² , it was caused by radical polymerization of a (meth) acryloyl group at the interface between the primer layer (y1) having a thickness of 1 μm and the hard coat layer (x1). A film in which a carbon-carbon bond was formed was obtained.

  Next, the coating agent (1) for forming the surface layer is applied to the surface of the primer layer (y1) of the film using a wire bar # 12, dried at 85 ° C. for 2 minutes, and then placed in an air atmosphere. A hard coat film in which —Si—O—Si— bonds were formed at the interface between the primer layer (y1) and the surface layer (z1) was produced by leaving it in an environment at 0 ° C. for one day.

(Example 2)
The hard coat layer (x1), the primer layer (y2), and the primer layer (y2) were the same as in Example 1 except that the primer agent (2) was used instead of the primer agent (1). A hard coat film in which a bond was formed at the interface with the surface layer (z1) was obtained.

(Example 3)
A hard coat layer (x1), a primer layer (y3), and a primer layer (y3) are the same as in Example 1 except that the primer agent (3) is used instead of the primer agent (1). A hard coat film in which a bond was formed at the interface with the surface layer (z1) was obtained.

Example 4
The hard coat layer (x1), the primer layer (y4), and the primer layer (y4) were the same as in Example 1 except that the primer agent (4) was used instead of the primer agent (1). A hard coat film in which a bond was formed at the interface with the surface layer (z1) was obtained.

(Example 5)
A hard coat film was obtained in the same manner as in Example 1 except that the primer agent (5) was used instead of the primer agent (1). A hard coat film in which a bond was formed at the interface between the hard coat layer (x1) and the primer layer (y5) and between the primer layer (y5) and the surface layer (z1) was obtained.

(Example 6)
A hard coat layer (x1), a primer layer (y6), a primer layer (y6), and a primer layer (y6) except that the primer agent (6) was used instead of the primer agent (1). A hard coat film in which a bond was formed at the interface with the surface layer (z1) was obtained.

(Example 7)
The hard coat layer (x2), the primer layer (y1), and the primer layer (y1) were the same as in Example 1 except that the hard coat agent (2) was used instead of the hard coat agent (1). ) And the surface layer (z1), a hard coat film in which a bond was formed was obtained.

(Example 8)
Instead of the coating agent (1) for forming the surface layer, the coating agent (2) for forming the surface layer is applied using wire bar # 7, dried at 85 ° C. for 2 minutes, and then the environment at 60 ° C. in an air atmosphere. The hard coat layer (x1) and the primer layer (y1) were bonded to the interface between the primer layer (y1) and the surface layer (z2) in the same manner as in Example 1 except that the sample was left for one week. A formed hard coat film was obtained.

Example 9
A hard coat film was obtained in the same manner as in Example 8 except that the thickness of the primer layer was 2 μm. A hard coat film in which bonds were formed at the interface between the hard coat layer (x1) and the primer layer (y6), and the primer layer (y6) and the surface layer (z2) was obtained.

(Example 10)
A hard coat layer (x1), a primer layer (y7), a primer layer (y7), and a primer layer (y7), except that the primer agent (2) was used instead of the primer agent (1). A hard coat film in which a bond was formed at the interface with the surface layer (z2) was obtained.

(Example 11)
A hard coat layer (x1), a primer layer (y8), a primer layer (y8), and a primer layer (y8), except that the primer agent (3) was used instead of the primer agent (1). A hard coat film in which a bond was formed at the interface with the surface layer (z2) was obtained.

(Example 12)
A hard coat layer (x1), a primer layer (y9), a primer layer (y9), and a primer layer (y9) except that the primer agent (4) was used instead of the primer agent (1). A hard coat film in which a bond was formed at the interface with the surface layer (z2) was obtained.

(Example 13)
The hard coat layer (x1), the primer layer (y10), and the primer layer (y10) were the same as in Example 8 except that the primer agent (5) was used instead of the primer agent (1). A hard coat film in which a bond was formed at the interface with the surface layer (z2) was obtained.

(Example 14)
The hard coat layer (x1), the primer layer (y11), and the primer layer (y11) were the same as in Example 8 except that the primer agent (6) was used instead of the primer agent (1). A hard coat film in which a bond was formed at the interface with the surface layer (z2) was obtained.

(Example 15)
The hard coat layer (x3), the primer layer (y1), and the primer layer (y1) were the same as in Example 8 except that the hard coat agent (2) was used instead of the hard coat agent (1). ) And the surface layer (z2), a hard coat film having a bond formed thereon was obtained.

(Comparative Example 1)
A hard coat film was obtained in the same manner as in Example 1 except that the primer agent (7) was used instead of the primer agent (1). No bond was formed between the layers constituting the hard coat film.

(Comparative Example 2)
A hard coat film was obtained in the same manner as in Example 1 except that the primer layer (y1) was not formed.

(Comparative Example 3)
A hard coat film was obtained in the same manner as in Example 1 except that the primer layer (y1) and the surface layer (z1) were not formed.

(Comparative Example 4)
A hard coat film was obtained in the same manner as in Example 8 except that the primer agent (7) was used instead of the primer agent (1). No bond was formed between the layers constituting the hard coat film.

(Comparative Example 5)
A hard coat film was obtained in the same manner as in Example 8 except that the primer layer (y1) was not formed.

(Comparative Example 6)
A hard coat film was obtained in the same manner as in Example 8 except that the primer layer (y1) and the surface layer (z2) were not formed.

(Comparative Example 7)
A hard coat film was obtained in the same manner as in Example 1 except that the hard coat layer (x1) was not formed.

  The following evaluation was performed about the hard coat film obtained by the said Example and comparative example.

[Measurement of water contact angle]
Using the automatic contact angle meter “DROMPAMSTER500” manufactured by Kyowa Interface Science Co., Ltd., 3 μL of purified water was deposited on the surface of the surface layer of the hard coat film obtained above, and the contact angle after 1 second was measured. did. In addition, the water contact angle of the hard coat film which does not have a surface layer measured the water contact angle of arbitrary surfaces by the method similar to the above.

  The contact angle calculation method in this measurement was based on the sessile drop method among the test methods described in JIS R3257.

[Evaluation of antifouling properties]
The index finger was pressed against the surface of the surface layer of the hard coat film for 10 seconds under a load of 500 g, and the surface was visually observed under a three-wavelength fluorescent lamp. The antifouling property was evaluated according to the following criteria after evaluation with 10 monitors. In addition, the antifouling property of the hard coat film which does not have a surface layer evaluated the antifouling property of arbitrary surfaces by the method similar to the above.

  A: 10 to 8 people evaluated that the surface of the hard coat film had almost no fingerprint attached.

  A: 7 to 5 people evaluated that the surface of the hard coat film had almost no fingerprint attached.

  (Triangle | delta): Four to two people evaluated that the adhesion of the fingerprint was hardly on the surface of the said hard coat film.

  X: Less than two persons evaluated that there was almost no fingerprint adhesion on the surface of the hard coat film.

<Anti-fouling durability (durability) 1 [Evaluation based on fingerprint adhesion]>
Steel wool (Bonster # 0000) was rubbed 5000 times at a speed of 30 times / min while applying a load of 500 g / cm ² on the surface of the surface layer of the hard coat film. The state of the friction part was visually observed, and scratch resistance was determined according to the following criteria. In addition, the antifouling property of the hard coat film which does not have a surface layer evaluated the antifouling property of arbitrary surfaces by the method similar to the above. In addition, the antifouling durability of the hard coat film having no surface layer was evaluated based on the antifouling property of a place where an arbitrary surface was rubbed under the above conditions.

  The antifouling property of the rubbed portion was evaluated by the same method as described in [Evaluation of antifouling property]. The following criteria were adopted as evaluation criteria.

  (Double-circle): 10-8 people evaluated that there was almost no adhesion of the fingerprint to the abrasion part surface of the said hard coat film.

  ○: Seven to five people evaluated that the surface of the hard-coated film was almost free from fingerprints.

  (Triangle | delta): Four or two people evaluated that there was almost no adhesion of a fingerprint to the abrasion part surface of the said hard coat film.

  X: Less than two persons evaluated that there was almost no fingerprint adhesion on the surface of the hard-coated film.

<Anti-fouling durability (durability) 2 [Evaluation based on water contact angle after abrasion test]>
The water contact angle of the friction part was measured by the same method as the method described in the column “Measurement of water contact angle”, and the water contact angle after friction was measured. In addition, the water contact angle of the hard coat film which does not have a surface layer measured the water contact angle of the location which rubbed arbitrary surfaces on the said conditions by the method similar to the above.

[Evaluation of anti-fogging property]
Water vapor released from a general steam humidifier was applied to the surface layer of the hard coat film for 5 seconds. Then, within 2 seconds, the hard coat film was placed at a position 10 cm from the surface of the paper on which characters (“hard coat film”) having a font size of 11 were printed. The anti-fogging property was evaluated based on whether or not the characters printed on the paper could be read through the hard coat film. In addition, the anti-fogging property of the hard coat film which does not have a surface layer evaluated the anti-fogging property of arbitrary surfaces by the method similar to the above.

  ○: The characters could be read clearly.

  Δ: Although the outline of the character was unclear, the character could be recognized and read.

  ×: Characters could not be recognized and read.

<Anti-fouling durability (durability) 1 [Evaluation based on anti-fogging property]>
An industrial eraser (φ6.2 mm) manufactured by Manaslu Co., Ltd. was placed on the surface of the surface layer of the hard coat film, and the surface was rubbed 10 times at a speed of 30 times / minute while applying a load of 200 g. The durability of the anti-fogging property of the friction part was evaluated by the following method. In addition, the durability of the anti-fogging property of the hard coat film having no surface layer was evaluated based on the anti-fogging property of a place where an arbitrary surface was rubbed under the above conditions.

  The anti-fogging property of the rubbed portion was evaluated by the same method as described in [Evaluation of anti-fogging property] above. The following criteria were adopted as evaluation criteria.

  ○: The characters could be read clearly.

  Δ: Although the outline of the character was unclear, the character could be recognized and read.

  ×: Characters could not be recognized and read.

  As is apparent from the above table, the hard coat films of the present invention of Examples 1 to 7 were hard coat films having excellent antifogging properties and excellent durability of each characteristic. Moreover, the hard coat film of the present invention of Examples 8 to 15 was a hard coat film having excellent antifouling properties and excellent durability of each characteristic. On the other hand, the hard coat films of Comparative Examples 1 to 3 do not have sufficient anti-fogging properties and / or anti-fogging durability, and the hard coat films of Comparative Examples 4 to 7 have antifouling properties and / or antifouling properties. Durability was not enough.

Claims (6)

A hard coat film in which a hard coat layer (X), a primer layer (Y), and a surface layer (Z) are sequentially laminated on at least one surface of a substrate, the hard coat layer (X) and the primer layer (Y) forms a bond (xy), and the primer layer (Y) and the surface layer (Z) form a bond (yz). the film. The hard coat film according to claim 1, wherein the bond (xy) is a carbon-carbon bond formed by radical polymerization of a (meth) acryloyl group. The hard coat film according to claim 1, wherein the bond (yz) is a bond constituted by a silicon atom and an oxygen atom or a titanium atom and an oxygen atom. The hard according to any one of claims 1 to 3, wherein the primer layer (Y) is formed using a primer agent containing a silane compound in which an alkoxy group or a hydroxy group is directly bonded to a silicon atom. Coat film. Furthermore, the hard coat film of any one of Claims 1-4 which has a decorating layer or an adhesive layer. An image display device in which the hard coat film according to claim 1 is laminated.