WO2015186685A1

WO2015186685A1 - Protective adhesive film, image display device, and portable electronic terminal

Info

Publication number: WO2015186685A1
Application number: PCT/JP2015/065852
Authority: WO
Inventors: 大亮渡辺; 佑輔高橋; 祐也北出
Original assignee: Dic株式会社
Priority date: 2014-06-05
Filing date: 2015-06-02
Publication date: 2015-12-10
Also published as: JP2016210995A; JP6222304B2; TW201601907A; JP6002969B2; JPWO2015186685A1

Abstract

The problem to be solved by the present invention is to provide a protective adhesive film that can prevent damage to a polarized plate or the like caused by touch entry or the like even if disposed on the surface of the polarized plate without an interposed glass substrate. The present invention relates to a protective adhesive film comprising an adhesive layer with a thickness of at least 15 µm on at least one surface of a hard-coated film and having a total thickness of at least 150 µm, wherein the hard-coated film comprises a hard-coating layer on at least one surface of a resin film with a thickness of at least 130 µm, and the hard-coating layer has on the surface thereof a Martens hardness of at least 250 N/mm², such hardness being measured by pressing a Vickers indenter that has face angles of 136° into the surface of the hard-coating layer with a load of 1 mN.

Description

Protective adhesive film, image display device and portable electronic terminal

The present invention relates to a protective adhesive film for protecting the surface of an information display device such as a liquid crystal display or an organic electroluminescence display.

Further reduction in weight and thickness is required for portable electronic terminals such as portable personal computers, electronic notebooks, and mobile phones. Accordingly, information display devices installed in the portable electronic terminal are also required to be reduced in weight and thickness.

As the information display device, a liquid crystal module having a touch panel function called a so-called on-cell type or in-cell type is known.

However, the liquid crystal module has a problem that the polarizing plate constituting the liquid crystal module is likely to cause dents and scratches due to pressure that can be generated during touch input.

As a method for preventing damage to the polarizing plate due to the pressure, for example, a method is known in which a glass substrate is provided on the surface side of the polarizing plate, and a hard coat film is provided on the surface of the glass substrate (for example, , See Patent Document 1).

However, the glass substrate is relatively expensive, and the portable electronic terminal obtained using the glass substrate tends to be thicker and heavier. There was a case that could not be supported.

As an information display device that achieves both weight reduction and thickness reduction, for example, a conventional hard coat film is pasted on the surface of an optical film such as a polarizing plate constituting the information display device without using a rigid body such as the glass substrate. The thing which was done is mentioned.

However, since the conventional hard coat film is generally thin and flexible, it is likely to be deformed by the pressure when touch-inputting the information display device, and as a result, the polarizing plate may be easily damaged.

By the way, when the hard coat film is attached to the surface of an optical film such as a polarizing plate, an adhesive layer is often provided between them.

However, if the pressure-sensitive adhesive layer is a thin film, it may generally cause damage such as dents in the optical film, and if the pressure-sensitive adhesive layer is a thick film, generally the surface of the hard coat film is scratched. There was a problem that it was easy to stick.

In this way, even when a hard coat film is attached to an optical film such as a polarizing plate without using a rigid body such as a glass substrate, without causing damage such as dents in the optical film, and A film capable of preventing the hard coat film itself from being damaged has been demanded by the industry.

JP 2008-095064 A

The problem to be solved by the present invention is to prevent damage to the optical film due to touch input, etc. even when it is attached to the surface of an optical film such as a polarizing plate without using a rigid body such as a glass substrate. It is possible to provide a protective adhesive film that can be made and is not easily damaged.

The present inventors provide a protective adhesive film having a total thickness of 150 μm or more having an adhesive layer (B) having a thickness of 15 μm or more on at least one surface side of the hard coat film (A), the hard coat film (A) has a hard coat layer (a2) on at least one surface side of a resin film (a1) having a thickness of 130 μm or more, and a ridge angle 136 on the surface of the hard coat layer (a2). The above problem was solved by a protective adhesive film characterized by having a Martens hardness of 250 N / mm ² or more measured by pushing a Vickers indenter at a load of 1 mN.

The protective adhesive film of the present invention can prevent damage to the surface of the protective adhesive film even when a local pressure is applied due to impact, touch input, etc. Scratches and deformation (such as dents) can be prevented.

The protective adhesive film of the present invention is a protective adhesive film having a total thickness of 150 μm or more having an adhesive layer (B) having a thickness of 15 μm or more on at least one surface side of the hard coat film (A), The coat film (A) has a hard coat layer (a2) on at least one surface side of a resin film (a1) having a thickness of 130 μm or more, and a ridge is formed on the surface of the hard coat layer (a2). The Martens hardness measured by pushing a 136 V angle Vickers indenter with a load of 1 mN is 250 N / mm ² or more.

As the protective adhesive film of the present invention, the surface of the protective adhesive film is prevented from being scratched, and the optical film is damaged or deformed even when it is directly attached to the surface of an adherend such as an optical film. In order to prevent (dents and the like), a material having a total thickness of 150 μm or more is used. The protective adhesive film can be suitably used exclusively as an adhesive film for protecting the surface of the information display device, and an optical film such as a polarizing plate constituting the surface of a so-called in-cell type and on-cell type information display device. It can be more suitably used as an adhesive film for protecting the film.

As the protective adhesive film, a film having a thickness of 150 μm to 500 μm is preferably used, a film having a thickness of 150 μm to 400 μm is more preferably used, and a film having a thickness of 150 μm to 350 μm is used. However, even when it is directly affixed to the surface of the optical film, it is more preferable because the optical film can be prevented from being damaged, and the final product such as a portable electronic terminal can be made thinner and lighter.

As the hard coat film (A) constituting the protective adhesive film, one having a hard coat layer (a2) on at least one surface side of a resin film (a1) having a thickness of 130 μm or more is used.

As the hard coat film (A), it is preferable to use a film provided with the hard coat layer (a2) on one side of the resin film (a1) directly or via another layer, It is more preferable to use a resin film (a1) provided with the hard coat layer (a2) directly on one side in order to reduce the thickness and weight of a portable electronic terminal or the like.

The hard coat film (A) has a Martens hardness of 250 N / mm ² or more measured by pushing a Vickers indenter having a ridge angle of 136 ° into the surface of the hard coat layer (a2) with a load of 1 mN. Use things. Here, since the surface hardness of the protective adhesive film produced using a hard coat film having a Martens hardness of less than 250 N / mm ² is significantly reduced, the above problem may not be solved.

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The Martens hardness ^is preferably in the range of 250N / mm 2 ~ 800N / mm 2, more preferably in the range of 250N / mm 2 ~ 500N / mm 2, 250N / mm 2 ~ 450N / mm 2 It is preferable that the thickness is within the range because it is possible to prevent the hard coat film (A) from being damaged, and even when directly attached to an optical film or the like, cracks during cutting can be effectively suppressed.

Here, the Martens hardness is prepared by preparing a hard coat film (A) provided with a hard coat layer (a2) on one side or both sides of the resin film (a1), and applying it to the surface of a smooth glass plate. The value is measured by placing the hard coat layer (a2) on the upper surface and pushing a Vickers indenter with a ridge angle of 136 ° into the surface (surface made of the hard coat layer (a2)) with a load of 1 mN.

Moreover, as said hard coat film (A), it is preferable to use what the pencil hardness of the surface which consists of a hard coat layer (a2) which comprises it is 3H or more, and uses what is 4H or more. Even when the adhesive layer (B) is laminated on the hard coat film (A) to form a protective adhesive film, the decrease in the surface hardness can be suppressed. As a result, the hard coat film (A) This is preferable because it is possible to achieve both higher levels of prevention of damage and prevention of deformation and damage to optical films and the like.

As the resin film (a1) constituting the hard coat film (A), a film having a thickness of 130 μm or more is used. Thereby, even if it is a case where it affixes directly on an optical film etc., the protective adhesive film which can prevent the damage of an optical film effectively can be obtained.

The thickness is preferably in the range of 130 μm to 300 μm, and in the range of 150 μm to 250 μm effectively prevents damage to the optical film even when directly attached to an optical film or the like. It is more preferable when obtaining the protective adhesive film which can be performed.

As said resin film (a1), the resin film which can design the Martens hardness of the said hard coat film (A) to 250 N / mm < ² > or more can be selected suitably, and can be used.

Examples of the resin film (a1) include polyethylene terephthalate film, polybutylene terephthalate film, polyethylene naphthalate film, polyethylene film, polypropylene film, cellophane film, diacetyl cellulose film, triacetyl cellulose film, acetyl cellulose butyrate film, and polychlorinated. Vinyl film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, polyether ether ketone film, polyether sulfone film, polyetherimide film , Polyimide film, fluorine resin film, Nylon film, it is possible to use an acrylic resin film or the like.

As the resin film (a1), it is preferable to select and use one having an elastic modulus in the range of 3 GPa to 15 GPa in order to obtain a hard coat film (A) having a Martens hardness of 250 N / mm ² or more, Moreover, when using a protective adhesive film, since the said resin film cannot change easily and the fall of the surface hardness of a protective adhesive film can be suppressed effectively, it is preferable. Further, by using the resin film (a1) having an elastic modulus in the above range, the finally obtained protective adhesive film becomes relatively flexible, and as a result, the protective adhesive film is affixed to, for example, a gentle curved surface portion. This is preferable because it easily follows the curved surface portion.

As the resin film (a1), use of a highly transparent film can ensure good visibility even when the protective adhesive film is installed on the surface of a display which is an information display device. preferable. The total light transmittance of the resin film (a1) is preferably 85% or more, more preferably 88% or more, and particularly preferably 90% or more.

As the resin film (a1), a resin film provided with a primer layer can be used for the purpose of further improving the adhesion with the hard coat layer (a2).

Further, the resin film (a1) has surface irregularities by a sandblasting method or a solvent treatment method for the purpose of further improving the adhesion with the hard coat layer (a2) or the pressure-sensitive adhesive layer (B). Those subjected to surface treatment such as chemical treatment, corona discharge treatment, chromic acid treatment, flame treatment, hot air treatment, ozone treatment, ultraviolet irradiation treatment and oxidation treatment can be used.

As the resin film (a1), a resin film containing an antistatic agent or the like can be used.

Examples of the antistatic agent include, as nonionic antistatic agents, polyoxyethylene alkyl ether, polyoxyethylene alkylphenol, polyoxyethylene alkylamine, polyoxyethylene alkylamide, fatty acid polyethylene glycol ester, fatty acid sorbitan ester, polyoxyethylene fatty acid Examples include sorbitan ester, fatty acid glycerin ester, and alkyl polyethyleneimine. Examples of the cationic antistatic agent include alkylamine salts, alkyl quaternary ammonium salts, and alkyl imidazoline derivatives. An acrylate compound having ethylene oxide as a skeleton can also be used.

In addition, as the antistatic agent, polyaniline, polypyrrole, polythiophene, poly3,4-ethylenedioxythiophene and derivatives thereof can be used as the conductive polymer. As the metal oxide, antimony-doped tin oxide (ATO), tin-doped indium oxide (ITO), aluminum-doped zinc oxide, antimony suboxide, or the like can be used. Further, as the antistatic agent, an ion conduction type antistatic agent in which metal ions such as lithium ions are mixed can also be used.

As described above, the hard coat layer (a2) constituting the hard coat film (A) is measured by pushing a Vickers indenter with an edge angle of 136 ° into the surface of the hard coat layer (a2) with a load of 1 mN. The one whose Martens hardness can be 250 N / mm ² or more is used.

As said hard-coat layer (a2), the hardened | cured material layer formed using various hard-coat agents is mentioned, For example, the layer formed using the hard-coat agent containing an active energy ray-curable composition is mentioned. It is done.

The hard coat layer (a2) preferably has a thickness of 3 μm to 25 μm, more preferably a thickness of 4 μm to 20 μm, and a thickness of 5 μm to 16 μm. It is possible to obtain a protective film that can prevent the hard coat film (A) from being damaged and can effectively prevent the optical film from being damaged even when it is directly attached to the optical film or the like. This is more preferable in preventing warpage of the hard coat film (A) and the protective adhesive film due to the curing shrinkage of the hard coat agent when the hard coat layer (a2) is formed.

As a hard coat agent that can be used for forming the hard coat layer (a2), a hard coat agent containing (meth) acrylate for obtaining a hard coat film (A) having a Martens hardness in the above-described range. It is preferable to use urethane (meth) acrylate (X) for suppressing the curing shrinkage of the hard coat agent and forming a hard coat layer excellent in high surface hardness and durability. It is more preferable to use a hard coat agent.

As the urethane (meth) acrylate (X), various urethane (meth) acrylates can be used. Among them, urethane (meth) acrylate having 4 or more (meth) acryloyl groups in the molecule is used. Is preferable for obtaining a hard coat film (A) having a Martens hardness of 250 N / mm ² or more.

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 the polyisocyanate, a trimer of the aliphatic polyisocyanate or alicyclic polyisocyanate may be used.

As the polyisocyanate, hexamethylene diisocyanate, which is an aliphatic diisocyanate, norbornane diisocyanate, which is an alicyclic diisocyanate, or isophorone diisocyanate is used to obtain a hard coat film (A) having a Martens hardness of 250 N / mm ² or more. It is preferable in that it is possible to prevent the hard coat film (A) from being damaged, and even if it is applied directly to the optical film or the like, it is preferable because the optical film can be more effectively prevented from being damaged.

Examples of the (meth) acrylate having a hydroxyl group that can be used in the production of the urethane (meth) acrylate (X) 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 ((meth) acryloxyethyl) hydroxyethyl isocyanurate, pentaerythritol tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, dipenta Erythritol 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, use of pentaerythritol tri (meth) acrylate or dipentaerythritol penta (meth) acrylate makes it possible to further improve the hard coat layer (a2) due to durability such as scratch resistance. It is preferable when obtaining the hard coat film provided with.

The urethane (meth) acrylate (X) can be produced by subjecting the polyisocyanate and the (meth) acrylate having a hydroxyl group to a urethanization reaction 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. Organic tin compounds such as diacetate and tin octylate, and organic zinc compounds such as zinc octylate can be used.

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

As the urethane (meth) acrylate (X), it is possible 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, Even when the hard coat film (A) having a Martens hardness of 250 N / mm ² or more is preferred, the hard coat film (A) can be prevented from being damaged, and even when directly attached to an optical film or the like. It is preferable because the optical film can be more effectively prevented from being damaged.

Further, as the urethane (meth) acrylate (X), urethane (meth) acrylate obtained by using isocyanurate such as bis ((meth) acryloxyethyl) hydroxyethyl isocyanurate, the above urethane (meth) Use in combination with acrylate is preferable for obtaining a hard coat film (A) having a Martens hardness of 250 N / mm ² or more, can prevent the hard coat film (A) from being damaged, and is directly applied to an optical film or the like. Even if it is affixed, it is preferable because the optical film can be more effectively prevented from being damaged.

By using urethane (meth) acrylate in a combination as described above, it has a Martens hardness in the above range, can effectively suppress warpage of the hard coat film due to the curing shrinkage, and has high surface hardness and durability. A hard coat film excellent in properties can be obtained.

As the hard coat agent that can be used for forming the hard coat layer (a2), those containing other (meth) acrylates other than the urethane (meth) acrylate (X) can be used.

Examples of the other (meth) acrylates include polyfunctional (meth) acrylate (Y) having three or more (meth) acryloyl groups in the molecule.

Examples of the polyfunctional (meth) acrylate (Y) 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, dipentaeryth Toruhekisa etc. (meth) acrylate, it can be combined used alone or two or more.

The polyfunctional (meth) acrylate (Y) has a (meth) acryloyl group equivalent of 50 g / eq. For further improving durability such as scratch resistance of the hard coat layer (a2). ~ 200 g / eq. In the range of 70 g / eq. ~ 150 g / eq. In the range of 80 g / eq. To 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 (Y) is preferably used in combination with the urethane (meth) acrylate (X).

The mass ratio [(X) / (Y)] of the urethane (meth) acrylate (X) and the polyfunctional (meth) acrylate (Y) is a hard coat film having a Martens hardness in the above-described range (A ) And the durability of the hard coat layer (a2), such as scratch resistance, is further improved, preferably in the range of 90/10 to 10/90, and 80/20 to 20/80. The range is more preferable, and the range of 75/25 to 25/75 is more preferable.

The total amount of the urethane (meth) acrylate (X) and the polyfunctional (meth) acrylate (Y) used is 10 to 99.95 parts by mass with respect to 100 parts by mass of the nonvolatile content of the hard coat agent. The amount is preferably 20 parts by mass to 99.5 parts by mass.

As a hard coat agent that can be used for forming the hard coat layer (a2), in addition to those described above, a mono (meth) acryloyl group having one (meth) acryloyl group in the molecule within the range not impairing the effects of the present invention ( 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 (X) and the polyfunctional (meth) acrylate (Y). It is more preferable.

As the hard coat agent that can be used for forming the hard coat layer (a2), a hard coat agent containing a photopolymerization initiator capable of initiating a curing reaction by irradiation with active energy rays 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′-di Aminobenzophenone compounds such as tilaminobenzophenone; 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.

Further, 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. Sulfur compounds such as sulfonates can be used.

The amount of the photopolymerization initiator and photosensitizer used is preferably 0.05 parts by mass to 20 parts by mass, and preferably 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 containing a 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, -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.

As the hard coating agent, an antifouling agent containing an active energy ray-curable compound (Z) having a fluorine atom and a silicon atom can be used for the purpose of imparting stain resistance, fingerprint resistance and the like.

As the active energy ray-curable compound (Z) having a fluorine atom and a silicon atom, for example, a compound having a fluorocarbon chain, a siloxane chain, a hydrocarbon chain, or the like can be used. In particular, as the active energy ray-curable compound (Z), a compound having one or both of a fluorocarbon chain and a siloxane chain can be used.

As the active energy ray-curable compound (Z), it is preferable to use a compound having a poly (perfluoroalkylene ether) chain as a fluorocarbon chain and a cyclopolysiloxane structure, and a poly (perfluoroalkylene ether). ) Compound (z1) having a structure in which a cyclopolysiloxane structure is bonded to both ends of the chain via a divalent linking group, and a (meth) acryloyl group is bonded to the cyclopolysiloxane structure via a divalent linking group ) Is preferably used.

Examples of the poly (perfluoroalkylene ether) chain of the compound (z1) include those having a structure in which a divalent fluorocarbon group having 1 to 3 carbon atoms and oxygen atoms are alternately connected. The divalent fluorocarbon group having 1 to 3 carbon atoms may be one kind or a combination of two or more kinds. Specifically, those represented by the following general formula (1) may be used. Can be mentioned.

(In the above general formula (1), X is the following formulas (1-1) to (1-5), and X is one of the following formulas (1-1) to (1-5) In addition, two or more of the following formulas (1-1) to (1-5) may be present in a random or block form, and n is a repeating unit. Represents an integer of 2 to 200.)

Among the poly (perfluoroalkylene ether) chains, among the above, a perfluoromethylene group represented by the formula (1-1), a perfluoroethylene group represented by the formula (1-2), and A poly (perfluoroalkylene ether) chain constituted by is preferable in terms of improving antifouling properties and slipperiness.

The molar ratio of the perfluoromethylene group represented by the formula (1-1) to the perfluoroethylene group represented by the formula (1-2) [the perfluoromethylene represented by the formula (1-1) Methylene group / perfluoroethylene group represented by the formula (1-2)] is preferably in the range of 1/10 to 10/1. Further, the value of n in the general formula (1) is preferably in the range of 2 to 200, more preferably in the range of 10 to 100, and still more preferably in the range of 20 to 80.

Examples of the cyclopolysiloxane structure possessed by the compound (z1) include a structure represented by the following general formula (2).

(In the general formula (2), R ¹ is a methyl group, R ³ is a divalent organic group bonded to a poly (perfluoroalkylene ether) chain, and R ⁴ is a 1 having a (meth) acryloyl group. And m is an integer of 2 to 5.)

The cyclopolysiloxane structure is preferably a cyclotetrasiloxane structure in which m in the general formula (2) is 3, among the above-described cyclopolysiloxane structures.

The divalent linking group that connects the poly (perfluoroalkylene ether) chain and the cyclopolysiloxane structure is not particularly limited as long as it is a divalent organic group. For example, the divalent linking group is represented by the following general formula (3). Can be mentioned.

(In the above general formula (3), Y is an alkylene group having 1 to 6 carbon atoms.)

In addition, the divalent linking group that bonds the cyclopolysiloxane structure and the (meth) acryloyl group is not particularly limited as long as it is a divalent organic group. For example, it is represented by the following general formula (4). Things.

(In the general formula (4), Z ¹ , Z ² and Z ³ are each independently an alkylene group having 1 to 6 carbon atoms.)

The compound (z1) can be produced, for example, through the following steps (1) to (3).
(1) A compound having an allyl group at both ends of a poly (perfluoroalkylene ether) chain and a cyclopolysiloxane compound having a hydrosilyl group are reacted in the presence of a platinum-based catalyst to form both poly (perfluoroalkylene ether) chains. A step of obtaining a compound having a cyclopolysiloxane structure at the terminal.
(2) A step of reacting the compound obtained in (1) with allyloxyalkanol in the presence of a platinum-based catalyst and adding a hydroxyl group to the cyclopolysiloxane structure portion of the compound obtained in (1).
(3) A step of reacting a hydroxyl group added in (2) with a (meth) acrylate having an isocyanate group to introduce a (meth) acryloyl group.

The active energy ray-curable compound (Z) such as the compound (z1) obtained by the above method is contained in the range of 0.05 to 5 parts by mass with respect to 100 parts by mass of the nonvolatile content of the hard coat agent. It is more preferable that it is contained in the range of 0.1 to 2 parts by mass in order to achieve both excellent surface hardness and antifouling properties.

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 film (A) used in the present invention can be produced, for example, by forming the hard coat layer (a2) by applying and curing the hard coat agent on one or both sides of the resin film (a1). it can.

Examples of the method for applying the hard coating agent to the resin film (a1) include gravure coating, roll coating, comma coating, air knife coating, kiss coating, spray coating, transfer coating, dip coating, spinner coating, wheeler coating, Examples thereof include brush coating, silk screen solid coating, wire bar coating, flow coating and the like, and printing methods such as offset printing and letterpress printing.

As the method for applying the hard coat agent to the resin film (a1), among those described above, a method using a gravure coat, roll coat, comma coat, air knife coat, kiss coat, wire bar coat, flow coat, etc. It is preferable because a hard coat layer (a2) having a uniform thickness can be formed.

As a method for curing the hard coat agent, for example, the hard coat agent is an active agent such as the urethane (meth) acrylate (X), polyfunctional (meth) acrylate (Y), or active energy ray-curable compound (Z). As long as it contains an energy ray-curable composition, a method of irradiating and curing an active energy ray on the coated surface on which the hard coat agent has been applied and dried may be mentioned.

Examples of the active energy rays include ionizing radiation such as ultraviolet rays, electron rays, 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 Lamps, mercury-xenon lamps, short arc lamps, helium / cadmium lasers, argon lasers, sunlight, LEDs and the like.

When the hard coat layer (a2) is formed by irradiating with the ultraviolet rays, the irradiation with the ultraviolet rays is preferably performed in an inert gas atmosphere such as nitrogen gas in order to suppress oxygen inhibition of radical polymerization.

Moreover, when forming the said hard-coat layer (a2), after irradiating the said active energy ray as needed, you may heat etc. Moreover, after irradiating an active energy ray after a heating Good.

Next, the pressure-sensitive adhesive layer (B) constituting the protective pressure-sensitive adhesive film of the present invention will be described.

The pressure-sensitive adhesive layer (B) has a suitable adhesive force to an adherend such as a polarizing plate, can prevent the hard coat film (A) from being damaged, and is directly attached to an optical film or the like. Even if it is a case, in order to prevent those damages more effectively, a thing with a thickness of 15 micrometers or more is used.

The pressure-sensitive adhesive layer (B) preferably has a thickness in the range of 15 μm to 150 μm, more preferably has a thickness in the range of 20 μm to 140 μm, and more preferably 20 μm to 130 μm. It is more preferable to use a material having a thickness in the range of 20 μm to 110 μm, even more preferable to use a material having a thickness in the range of 20 μm to 110 μm. More preferably, the use of a film having a thickness in the range of 20 μm to 45 μm has a suitable adhesive force to an adherend such as an optical film and has a high surface hardness and a protective adhesive film It is further preferable in obtaining.

The above-mentioned problem to be solved by the present invention cannot be solved simply by setting the thickness of the pressure-sensitive adhesive layer (B) to 15 μm or more, but the hard coat film having a specific Martens hardness ( It can be solved only by combining with A) and technical matters such as the total thickness of the protective adhesive film.

The pressure-sensitive adhesive layer (B) preferably has a storage elastic modulus at 20 ° C. in a dynamic viscoelastic spectrum at a frequency of 1 Hz of 1.0 × 10 ⁵ Pa to 5.0 × 10 ⁵ Pa. More preferably, it is 5 × 10 ⁵ Pa to 4.5 × 10 ⁵ Pa, and 2.0 × 10 ⁵ Pa to 4.0 × 10 ⁵ Pa can maintain the high surface hardness of the protective adhesive film. For example, even when local pressure is generated on the surface of the protective adhesive film due to touch input or impact, damage to the adherend such as an optical film can be alleviated and deformation of the polarizing plate etc. It is more preferable because it can effectively prevent dents and dents.

The pressure-sensitive adhesive layer (B) can be formed by applying a pressure-sensitive adhesive. As the pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, or the like can be used.

Among them, the use of an acrylic pressure-sensitive adhesive containing an acrylic polymer as the pressure-sensitive adhesive can further improve the adhesion to the hard coat film (A), transparency, weather resistance, and the like. Therefore, it is preferable.

As the acrylic polymer, a polymer obtained by polymerizing a (meth) acrylic monomer can be used. Examples of the (meth) acrylic monomer include (meth) acrylate, and it is preferable to use a monomer containing (meth) acrylate having an alkyl group having 2 to 14 carbon atoms.

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 meta Relate, n- octyl methacrylate, isooctyl methacrylate, 2-ethylhexyl methacrylate, isononyl methacrylate, isodecyl methacrylate, lauryl methacrylate.

Among the above-mentioned (meth) acrylates, it is preferable to use alkyl (meth) acrylates having an alkyl group having 4 to 9 carbon atoms, and alkyl acrylates 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 to 99 parts by mass with respect to 100 parts by mass of the total amount of the (meth) acrylic monomer. It is more preferable to use in the range of 90 to 96 parts by mass because it is easy to ensure a suitable adhesive force.

As the acrylic polymer, for example, a polymer having a polar group such as a hydroxyl group, a carboxyl group, and an amide group can be used.

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. Of 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. Of these, N-vinyl-2-pyrrolidone, N-vinylcaprolactam, and acryloylmorpholine are preferably used.

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 it is preferable to use in the range of 1.5% by mass to 8% by mass in a suitable range of cohesive strength, holding power, and adhesiveness. It is more preferable because it is easy to adjust.

The weight average molecular weight of the acrylic polymer is preferably 400,000 to 1,400,000, and more preferably 600,000 to 1,200,000. By setting it as the weight average molecular weight, the adhesive force can be easily adjusted to a specific range, and when a protective adhesive film is formed, a local pressure at the time of impact or touch input can be easily relaxed.

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 a range where the gel fraction of the pressure-sensitive adhesive layer to be formed is 25% by mass to 85% by mass, and is used in a range where the gel fraction is 40% by mass to 80% by mass. More preferably, use in the range of 50% by mass to 75% by mass can suppress a decrease in surface pencil hardness when the protective adhesive film of the present invention is attached to an adherend such as a polarizing plate. And the adhesiveness can be sufficient. 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, a material containing a tackifying resin can be used to further increase the adhesive strength.

The tackifying resin is preferably used in the range of 10 to 60 parts by mass with respect to 100 parts by mass of the acrylic polymer. Further, when importance is attached to adhesiveness, it is preferably added in the range of 20 to 50 parts by mass.

As the pressure-sensitive adhesive, those containing known and commonly used additives other than the above can be used.

As the additive, for example, when it is desired to improve the adhesion to a glass substrate or a metal member, the silane cup is in the range of 0.001 to 0.005 parts by mass with respect to 100 parts by mass of the adhesive. It is preferable to add a ring agent. Furthermore, as necessary, plasticizers, softeners, fillers, pigments, flame retardants, and the like can be added as other additives.

The protective adhesive film of the present invention forms the adhesive layer (B) by directly applying and drying the adhesive on one or both sides, preferably one side, of the hard coat film (A) produced by the above method. Can be manufactured by.

In addition, the protective adhesive film of the present invention was obtained by applying the adhesive to the surface of the release liner in advance on one or both sides, preferably one side, of the hard coat film (A) produced by the above method and drying it. It can manufacture by transferring an adhesive layer (B).

When the hard coat film (A) has a hard coat layer on both sides, the pressure-sensitive adhesive layer (B) is preferably provided on the surface side of the hard coat layer on one side thereof. When the hard coat film (A) has a hard coat layer (a2) on one side, the pressure-sensitive adhesive layer (B) is the resin on the side where the hard coat layer (a2) is not provided. It is preferable to be provided on the surface side of the film (a1).

The protective adhesive film of the present invention has a structure in which the physical property value and thickness of the hard coat film (A) and the pressure-sensitive adhesive layer (B) are adjusted to a specific range and combined, so that the protective adhesive film is impacted or touched. Even when a local pressure is applied by the input, the stress can be appropriately relaxed, so that damage to the adherend can be suppressed, and the surface hardness of the protective adhesive film can be impaired. Therefore, high scratch resistance can be realized.

The protective adhesive film of the present invention has a high surface hardness. Specifically, the pencil hardness of the protective adhesive protective film in a state where the protective adhesive film is attached to a glass plate is preferably 2H or higher, more preferably 3H or higher. Therefore, the protective adhesive film of the present invention can be suitably used mainly as a protective adhesive film for image display portions of portable electronic terminals and protective adhesive films for various displays.

The laminate of the present invention is a laminate of the protective adhesive film of the present invention and a polarizing plate.

Conventionally, mainly in the manufacturing scene of information display devices, a protective adhesive film and a polarizing plate may be laminated via a glass substrate.

However, since the glass substrate is a rigid body, there is a problem that the laminated body cannot be rolled up.

In addition, since the glass substrate is relatively thick and heavy, it may be impossible to reduce the thickness and weight of the information display device.

Since the laminate of the present invention is obtained by pasting the protective adhesive film directly or through a flexible resin film on a polarizing plate without using a conventional thick glass substrate, it is wound up in a roll shape or the like. The laminate can be manufactured by so-called roll-to-roll, and the production efficiency can be improved as compared with the conventional one.

As the polarizing plate used in the present invention, a general polarizing plate in which a polarizer protective layer is laminated on both sides of the polarizer can be used.

A polarizer obtained by using a polyvinyl alcohol-based resin can be used. The polyvinyl alcohol resin can be produced by saponifying a polyvinyl acetate resin.

The polarizer can be produced, for example, by adsorbing and orienting a dichroic dye on a formed polyvinyl alcohol resin film.

Further, the polarizing plate can be produced by laminating a polarizer protective layer such as a triacetyl cellulose film on both surfaces of the polarizer obtained above via an adhesive layer.

As the dichroic dye, iodine or a dichroic organic dye can be used. In order to dye the polyvinyl alcohol-based resin film with a dichroic dye, the polyvinyl alcohol-based resin film can be immersed in an aqueous solution containing these dyes. When iodine is used as the dichroic dye, a method of immersing and dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide is usually employed.

The polarizer protective layer is not particularly limited, but it is preferable to use a protective layer obtained by using a resin having excellent transparency on the assumption that it is used as a display material.

Examples of the polarizer protective layer include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene film, polypropylene film, cellophane, diacetyl cellulose film, triacetyl cellulose film, acetyl cellulose butyrate film, polyvinyl chloride film, poly Vinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, cycloolefin resin film, polymethylpentene film, polysulfone film, polyetheretherketone film, polyethersulfone film, polyether Imide film, polyimide film, fluorine resin film, Niro Film, acrylic resin film or the like.

Further, when a polarizer protective layer is formed on both sides of the polarizer layer, it is possible to form a polarizer protective layer made of a different resin on each side. For example, a polarizer protective layer made of a triacetyl cellulose film can be formed on one side of the polarizer layer, and a polarizer protective layer made of a cycloolefin-based resin film can be formed on the other side.

As the polarizing plate, it is preferable to use a polarizing plate having a thickness of 50 μm to 200 μm because it can contribute to weight reduction and thinning of the information display device and the portable electronic terminal.

[Information display device and portable electronic terminal]
Examples of the information display device of the present invention include a device in which a liquid crystal display module (LCD module) and the protective adhesive film of the present invention are laminated, and the protective adhesive film is formed on the surface of the polarizing plate constituting the liquid crystal display module. It is preferable that the device is directly stacked.

As the liquid crystal display module, for example, a liquid crystal display module having an in-cell type or on-cell type touch panel function can be suitably used. In the liquid crystal display module having the in-cell type or on-cell type touch panel function, the outermost surface of the information display unit is often a polarizing plate. Therefore, in the information display device of the present invention, it is preferable that the protective adhesive film is directly attached to the surface of the polarizing plate constituting the liquid crystal display module.

The information display device in which the protective adhesive film is directly attached to the polarizing plate can be suitably used for, for example, a portable electronic terminal, a large display, an in-vehicle display, and the like. In particular, it is preferably used for portable electronic terminals and in-vehicle displays that often have a touch panel function.

The information display device of the present invention can be manufactured, for example, by laminating a liquid crystal display module manufactured in advance and the protective adhesive film.

In addition, the information display device of the present invention is manufactured by bonding the laminate composed of the protective adhesive film and the polarizing plate and a liquid crystal display panel (LCD) with, for example, a highly transparent adhesive tape. Can do. Since the laminate is flexible enough to be bent, when it is bonded to a liquid crystal display panel, which is generally a rigid body, it is difficult for air bubbles to be caught in the interface between them, resulting in production efficiency of the information display device. Can be significantly improved.

Since the above-described configuration has a configuration composed of the laminate, the surface layer is hardly scratched, and the polarizing plate is less likely to be depressed due to local stress. For this reason, it is preferable that the above configuration is employed in a portable electronic terminal that is susceptible to local stress due to dropping or the like.

Hereinafter, the present invention will be described more specifically with reference to examples and comparative 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, the reaction is continued for 3 hours at 70 ° C., and further reacted until the infrared absorption spectrum of 2250 cm ⁻¹ showing the isocyanate group disappears, whereby butyl acetate containing urethane acrylate (A1) and PE4A is contained. 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, and 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, the reaction is continued for 3 hours at 70 ° C., and further reacted until the infrared absorption spectrum of 2250 cm ⁻¹ showing the isocyanate group disappears, whereby butyl acetate containing urethane acrylate (A2) and PE4A is contained. 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, and 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 dropping, the reaction is continued at 70 ° C. for 3 hours, and further, the reaction is continued until the infrared absorption spectrum of 2250 cm ⁻¹ showing the isocyanate group disappears, whereby butyl acetate containing urethane acrylate (A3) and PE4A is contained. 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.

(Preparation Example 1: Preparation of hard coat agent (HC1))
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 a solution, 30 parts by mass of a mixture of dipentaerythritol hexaacrylate and dipentaerythritol pentaacrylate (dipentaerythritol hexaacrylate / dipentaerythritol pentaacrylate = 60/40 (mass ratio)), a reactive fluorine antifouling agent ( Optool DAC-HP; manufactured by Daikin Industries, Ltd. (non-volatile content 20% by mass) 2.0 parts by mass and photopolymerization initiator (“Irgacure 184” manufactured by BASF Japan Ltd., 1-hydroxycyclohexyl phenyl ketone) 4.5 parts by mass After stirring uniformly, dilute with ethyl acetate Te was nonvolatile content of 40% by weight of the hard coat agent (HC1) was prepared.

(Preparation Example 2: Preparation of hard coat agent (HC2))
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 a solution, 105 parts by mass of a mixture of dipentaerythritol hexaacrylate and dipentaerythritol pentaacrylate (dipentaerythritol hexaacrylate / dipentaerythritol pentaacrylate = 60/40 (mass ratio)), a reactive fluorine antifouling agent ( Optool DAC-HP; manufactured by Daikin Industries, Ltd. (non-volatile content 20% by mass) 2.0 parts by mass and photopolymerization initiator (“Irgacure 184” manufactured by BASF Japan Ltd., 1-hydroxycyclohexyl phenyl ketone) 4.5 parts by mass After stirring uniformly, dilute with ethyl acetate. There was a non-volatile content 40% by weight of the hard coat agent (HC2) was prepared.

(Production Example 1)
100 parts by mass of SK Dyne 909A (manufactured by Soken Chemical Co., Ltd., acrylic adhesive) and 0.7 parts by mass of Coronate L-45 (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate cross-linking agent, solid content 45% by mass) An adhesive was prepared by mixing and stirring for 15 minutes.

Next, the adhesive is applied to a release liner having a silicone compound release layer formed on one side of a 75 μm thick polyethylene terephthalate film, and dried at 75 ° C. for 5 minutes. By doing so, the adhesive layer (1) was formed.

(Production Example 2)
A pressure-sensitive adhesive layer (2) was obtained in the same manner as in Production Example 1, except that the thickness of the pressure-sensitive adhesive layer was changed from 25 μm to 50 μm.

(Production Example 3)
A pressure-sensitive adhesive layer (3) was obtained in the same manner as in Production Example 1, except that the thickness of the pressure-sensitive adhesive layer was changed from 25 μm to 100 μm.

(Production Example 4)
A pressure-sensitive adhesive layer (4) was obtained in the same manner as in Production Example 1, except that the thickness of the pressure-sensitive adhesive layer was changed from 25 μm to 10 μm.

(Production Example 5)
In a reaction vessel equipped with a stirrer, reflux condenser, thermometer, dropping funnel and nitrogen gas inlet, 24 parts by mass of n-butyl acrylate, 75 parts by mass of 2-methoxyethyl acrylate, 1 part by mass of 2-hydroxyethyl acrylate, polymerization By mixing 0.2 parts by mass of 2,2′-azobisisobutylnitrile as an initiator and 100 parts by mass of ethyl acetate, the inside of the reaction vessel was purged with nitrogen, and then polymerized at 80 ° C. for 8 hours to obtain a weight average. An acrylic copolymer having a molecular weight of 700,000 was obtained.

Next, an adhesive having a solid content of 30% by mass was obtained by mixing the acrylic copolymer and ethyl acetate.

Next, 100 parts by mass of the above-mentioned pressure-sensitive adhesive and 0.1 part by mass of Coronate HX (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent, solid content: 75% by mass) were mixed and stirred for 15 minutes. A pressure-sensitive adhesive layer (coated with a release layer of a silicone compound on one side of a 75 μm-thick polyethylene terephthalate film was applied to a thickness of 50 μm after drying and dried at 75 ° C. for 5 minutes. 5) was formed.

Example 1
The hard coat agent (1) is applied to one side of a polyethylene terephthalate film (Cosmo Shine A4300 manufactured by Toyobo Co., Ltd.) having a thickness of 188 μm using a bar coater, dried at 80 ° C. for 90 seconds, and then exposed to ultraviolet rays in an air atmosphere Hard coat with a thickness of 12 μm by irradiating ultraviolet rays with an irradiation light amount of 0.5 J / cm ² using an irradiation device (“F450” manufactured by Fusion UV Systems Japan Co., Ltd., lamp: 120 W / cm, H bulb) A hard coat film with a layer was obtained.

Next, the pressure-sensitive adhesive layer (1) is pressed and bonded to the surface of the hard coat film made of the polyethylene terephthalate film at a pressure of 4 kg / cm, and cured at 40 ° C. for 2 days, thereby providing a protective adhesive having a thickness of 225 μm. A film (1) was obtained.

(Example 2)
A protective adhesive film (2) having a thickness of 287 μm was obtained in the same manner as in Example 1 except that a polyethylene terephthalate film having a thickness of 250 μm was used instead of the polyethylene terephthalate film having a thickness of 188 μm.

Example 3
A protective adhesive film (3) having a thickness of 250 μm was obtained in the same manner as in Example 1 except that the adhesive layer (2) was used instead of the adhesive layer (1).

Example 4
A protective adhesive film (4) having a thickness of 300 μm was obtained in the same manner as in Example 1 except that the adhesive layer (3) was used instead of the adhesive layer (1).

(Example 5)
Implemented except that a polyethylene terephthalate film having a thickness of 250 μm was used instead of a polyethylene terephthalate film having a thickness of 188 μm, and that the adhesive layer (2) was used instead of the adhesive layer (1). A protective adhesive film (5) having a thickness of 312 μm was obtained in the same manner as in Example 1.

(Example 6)
Implemented except that a polyethylene terephthalate film with a thickness of 250 μm was used instead of a polyethylene terephthalate film with a thickness of 188 μm, and that the adhesive layer (3) was used instead of the adhesive layer (1). In the same manner as in Example 1, a protective adhesive film (6) having a thickness of 362 μm was obtained.

(Example 7)
A protective adhesive film (7) having a thickness of 225 μm was obtained in the same manner as in Example 1 except that the hard coat agent (2) was used instead of the hard coat agent (1).

(Example 8)
The thickness is the same as in Example 1 except that the hard coat agent (2) is used instead of the hard coat agent (1) and the thickness of the hard coat layer is changed from 12 μm to 6 μm. A protective adhesive film (8) having a thickness of 219 μm was obtained.

Example 9
A protective adhesive film (9) having a thickness of 225 μm was obtained in the same manner as in Example 1 except that the adhesive layer (5) was used instead of the adhesive layer (1).

(Example 10)
A protective adhesive film (10) having a thickness of 228 μm was obtained in the same manner as in Example 1 except that the thickness of the hard coat layer was changed from 12 μm to 15 μm.

(Example 11)
A protective adhesive film (11) having a thickness of 219 μm was obtained in the same manner as in Example 1 except that the thickness of the hard coat layer was changed from 12 μm to 6 μm.

Example 12
A protective adhesive film (12) having a thickness of 217 μm was obtained in the same manner as in Example 1 except that the thickness of the hard coat layer was changed from 12 μm to 4 μm.

(Comparative Example 1)
The hard coat agent (1) is applied to one side of a 125 μm-thick polyethylene terephthalate film (Cosmo Shine A4300 manufactured by Toyobo Co., Ltd.) using a bar coater, dried at 80 ° C. for 90 seconds, and then exposed to ultraviolet light in an air atmosphere. Hard coat with a thickness of 12 μm by irradiating ultraviolet rays with an irradiation light amount of 0.5 J / cm ² using an irradiation device (“F450” manufactured by Fusion UV Systems Japan Co., Ltd., lamp: 120 W / cm, H bulb) A hard coat film with a layer was obtained.

Next, the adhesive layer (1) is pressed and bonded to the surface of the hard coat film made of the polyethylene terephthalate film at a pressure of 4 kg / cm, and cured at 40 ° C. for 2 days, thereby providing a protective adhesive having a thickness of 162 μm. A film (13) was obtained.

(Comparative Example 2)
A protective adhesive film (14) having a thickness of 137 μm was obtained in the same manner as in Example 1 except that a polyethylene terephthalate film having a thickness of 100 μm was used instead of the polyethylene terephthalate film having a thickness of 188 μm.

(Comparative Example 3)
A protective adhesive film (15) having a thickness of 112 μm was obtained in the same manner as in Example 1 except that a polyethylene terephthalate film having a thickness of 75 μm was used instead of the polyethylene terephthalate film having a thickness of 188 μm.

(Comparative Example 4)
A protective adhesive film (16) having a thickness of 213 μm was obtained in the same manner as in Example 1 except that the hard coat layer was not formed.

(Comparative Example 5)
The thickness is the same as in Example 1 except that the thickness of the hard coat layer is changed from 12 μm to 1 μm and the pressure-sensitive adhesive layer (4) is used instead of the pressure-sensitive adhesive layer (1). A 214 μm protective adhesive film (17) was obtained.

(Comparative Example 6)
A protective adhesive having a thickness of 210 μm was used in the same manner as in Example 1 except that the adhesive layer (4) was used instead of the adhesive layer (1) and the thickness was changed from 25 μm to 10 μm. A film (18) was obtained.

The following evaluations were performed on the protective adhesive films obtained in the above examples and comparative examples. The obtained results are shown in Tables 1 to 3.

(Measurement method of storage modulus)
The storage elastic modulus of the pressure-sensitive adhesive layer was measured using a viscoelasticity tester (manufactured by Rheometrics, trade name: Ares 2KSTD). Specifically, a test piece was sandwiched between parallel disks, which are measurement parts of the test machine, and the storage elastic modulus (G ′) at 20 ° C. was measured at a frequency of 1 Hz. As the test piece used in the above measurement, the pressure-sensitive adhesive layer obtained in the above production example was cut into a circle having a thickness of 1 mm and a diameter of 8 mm.

(Martens hardness of hard coat film)
The hard coat film on which the adhesive layer was not laminated was placed on a glass plate so that the hard coat layer was on top, and the four corners were fixed with cellophane tape. Thereafter, the Martens hardness on the surface of the hard coat layer was measured using a Fischer scope HM2000Xyp (Fischer Instruments) by pushing a Vickers indenter with a ridge angle of 136 ° into a 1 mN load over 20 seconds.

It was evaluated whether or not damage to the polarizing plate or the like due to the touch input could be prevented by measuring the surface pencil hardness and stress relaxation property of the protective adhesive film.

(Measurement of pencil hardness of protective adhesive film)
The protective adhesive films obtained in the above Examples and Comparative Examples were attached to a glass plate, and the pencil hardness of the surface (hard coat layer) was determined based on the provisions of JIS K 5600-5-4 (1999 edition). Measurement was performed using a pencil of H to 4H and a pencil scratch tester (manual type) for coating film manufactured by Imoto Seisakusho Co., Ltd.

(Evaluation of stress relaxation 1)
A test piece was prepared by laminating a polyethylene terephthalate film having a thickness of 6 μm, one side of which is a black matte surface, as an alternative to the polarizing plate on the surface of the pressure-sensitive adhesive layer constituting the protective pressure-sensitive adhesive film. The pasting was performed so that the black matte surface constituting the polyethylene terephthalate film was on the front side (the side not in contact with the surface of the pressure-sensitive adhesive layer).

Next, the glass plate was placed so that the hard coat layer of the protective adhesive film constituting the test piece was on the upper side, and its four corners were fixed with cellophane adhesive tape.

Next, the surface consisting of the hard coat layer of the fixed test piece was subjected to JIS K 5600-5-4 (1999 version) using a pencil scratch tester for coating film (manual type) manufactured by Imoto Seisakusho Co., Ltd. It was scratched with a pencil having a hardness of 4H by a method according to the regulations.

The black matte surface corresponding to the back surface of the portion scratched with the pencil was visually observed to see if the scratch mark could be seen. Evaluation was performed according to the following criteria.

◎ No scratch marks were observed.

○ A pale white line due to scratch marks was observed.

△ A white line due to scratch marks was clearly confirmed.

X Convex line due to scratch marks was clearly confirmed.

(Evaluation of stress relaxation property 2)
Except that the load was changed from 750 g to 1 kg, the evaluation was performed by the same method and standard as the method described in the column “(Evaluation of stress relaxation 1)”.

Evaluation results are shown in Tables 1 to 3 below. In the table, PET refers to polyethylene terephthalate.

As is apparent from Tables 1 to 3, the protective adhesive film of the present invention can realize excellent stress relaxation properties while having a suitable surface hardness. On the other hand, since the protective adhesive films of Comparative Examples 1 to 3 use the same hard coat agent and adhesive as in Example 1, they do not satisfy the constitution of the present invention, so that the surface hardness or the stress relaxation property It was inferior to. Further, the protective adhesive film of Comparative Example 4 had a low surface hardness because there was no hard coat layer. The protective adhesive film of Comparative Example 5 was inferior in both surface hardness and stress relaxation properties. The protective adhesive film of Comparative Example 6 caused a decrease in stress relaxation when the load increased.

Claims

A protective adhesive film having a total thickness of 150 μm or more having an adhesive layer (B) having a thickness of 15 μm or more on at least one surface side of the hard coat film (A),
The hard coat film (A) has a hard coat layer (a2) on at least one surface side of a resin film (a1) having a thickness of 130 μm or more,
And the Martens hardness measured by pushing a Vickers indenter of 136 degrees of edge angles into the surface of the said hard-coat layer (a2) with a load of 1 mN is 250 N / mm < 2 > or more, It is characterized by the above-mentioned.
The protective adhesive film according to claim 1, wherein the thickness of the hard coat layer (a2) is 3 袖 m to 25 袖 m.
3. The storage elastic modulus at 20 ° C. in the dynamic viscoelastic spectrum at a frequency of 1 Hz of the pressure-sensitive adhesive layer (B) is 1.0 × 10 5 Pa to 5.0 × 10 5 Pa. The protective adhesive film as described.
The protective adhesive film according to any one of claims 1 to 3, wherein the hard coat film (A) has a pencil hardness measured from the hard coat layer (a2) side of 3H or more.
A laminate in which the protective adhesive film according to any one of claims 1 to 4 and a polarizing plate are laminated.
5. An information display device having a configuration in which the protective adhesive film according to claim 1 is attached to at least one surface of a polarizing plate having a thickness of 50 μm to 200 μm.
A portable electronic terminal having a configuration in which the protective adhesive film according to any one of claims 1 to 4 is attached to at least one surface of a polarizing plate having a thickness of 50 袖 m to 200 袖 m.