JP2019112603A - Active energy ray-curable hard coat agent and laminate - Google Patents

Abstract

To provide an active energy ray-curable hard coat agent for forming a hard coat layer achieving all of high scratch resistance, anti-fouling property, and bending resistance.SOLUTION: The active energy ray-curable hard coat agent contains alumina particles (A), an acrylate (B) having a perfluoroalkylene group, and a polyfunctional urethane acrylate (C), and satisfies conditions (1) and (2) below. The conditions include: (1) The alumina particles (A) have an α type and/or θ type crystalline structure and a primary particle diameter of 5 to 50 nm; and (2) the hard coat agent contains, in 100 mass% of the solid content, the alumina particles (A) by 5 to 50 mass% and the acrylate (B) by 0.05 to 5 mass%. However, the polyfunctional urethane acrylate (C) excludes the acrylate (B) having a perfluoroalkylene group.SELECTED DRAWING: None

Description

The present invention relates to an active energy ray-curable hard coating agent and a laminate.

More specifically, the present invention relates to an active energy ray-curable hard coating agent that can be applied to a display such as a TV, a notebook computer, a mobile phone, and a smartphone, or a rear housing portion thereof and a laminate using the same.

It is required that the image display surface of a display such as a TV, a notebook computer, a mobile phone, a smart phone or the like, or a rear housing portion thereof be provided with a hard coat property so as not to be damaged during handling. Therefore, a hard coat laminate is disposed on the surface of the device. This laminate has a configuration in which a hard coat layer is laminated on a light-transmissive substrate such as polyethylene terephthalate or triacetyl cellulose.

Hard coat laminates are those having each desired property. For example, the laminate in which the fine concavo-convex structure is formed on the surface of the laminate can be used as a hard coat layer and also as an antiglare film provided with an antiglare layer. Furthermore, it is also possible to laminate and use a light diffusion layer or a low refractive index layer. Development of an optical laminate having a desired function has been promoted by using a single functional layer such as a hard coat layer or an antiglare layer or combining a plurality of layers.

On the other hand, with respect to the outermost surface of the display or the rear housing portion thereof, severe handling due to loads such as physical, mechanical and chemical stimuli is expected. For example, dirt such as dust or fingerprints attached to the surface of the device may be wiped with a rag soaked with a glass cleaner (various types such as surfactant type and organic solvent type). In addition, the device surface has a problem that the image is easily distorted or the appearance quality is deteriorated due to sweat, fingerprints, etc. When a conventional general surface treatment agent is used, contamination such as fingerprints is not easily removed. This is a defect because of the spreading characteristics. Therefore, high scratch resistance and stain resistance are required for the hard coat film surface mounted in the device. Furthermore, when manufacturing or using the said hard-coat laminated body, it may become trouble by a crack etc. at the time of process use. Therefore, in addition to the antifouling property, the hard coat laminate is required to have bending resistance as crack prevention.

Heretofore, the hard coating agent constituting the above-mentioned hard coating layer is a coating agent which is cured by active energy rays, and various methods have been proposed as a method of realizing a surface treatment for imparting scratch resistance and stain resistance. For example, in order to improve fingerprint resistance, a coating hard coat agent containing a fluorine-based UV-curable functional group-containing compound has been proposed (Patent Document 1). In addition, in order to improve the antistatic property and the antifouling property, a hard coating agent containing ionizing radiation-curable fluorinated acrylate and a conductive metal oxide has been proposed (Patent Document 2). Furthermore, as a method of separately forming a coating layer that imparts contamination resistance on the abrasion resistant coating layer, separately coating a copolymer of acrylate having a perfluoro group and silica on a low reflection layer mainly composed of silica A method has been proposed (Patent Document 3).

However, there is still no active energy ray-curable hard coat agent for forming a hard coat layer having high scratch resistance (friction) and stain resistance, and further bending resistance.

JP 2011-505452 gazette JP, 2011-84048, A Japanese Patent Application Publication No. 07-16940

An object of the present invention is to provide an active energy ray-curable hard coat agent for producing a hard coat layer capable of achieving both high scratch resistance, stain resistance, and bending resistance.

As a result of intensive studies on the above problems, the present inventor has found that the problem can be solved by using an active energy ray-curable hard coating agent described below, resulting in the present invention.
The present invention contains an alumina particle (A), an acrylate (B) having a perfluoroalkylene group, and a polyfunctional urethane acrylate (C), and is characterized by satisfying the following (1) and (2): The present invention relates to an energy ray-curable hard coating agent.
(1) The crystal structure of the alumina particles (A) is θ-type and / or α-type, and the primary particle diameter is 5 to 50 nm.
(2) In 100 mass% of solid content of a hard-coat agent, 5-50 mass% of alumina particles (A) and 0.05-5 mass% of acrylates (B) are contained.
(However, multifunctional urethane acrylate (C) excludes acrylate (B) having a perfluoroalkylene group.)

The present invention relates to the hard coating agent characterized in that the number of functional groups of the polyfunctional urethane acrylate (C) is 4 to 15, and the molecular weight is 500 to 15,000.

The present invention relates to the above-mentioned hard coat agent further characterized by containing a polyfunctional ester acrylate (D).

The present invention relates to the above hard coat agent, wherein the polyfunctional ester acrylate (D) has an ester structure derived from a carboxylic acid having a ring structure of 6 or more carbon atoms.

The present invention relates to a laminate having a substrate and a hard coat layer comprising the hard coat agent.

According to the present invention, it has been possible to provide an active energy ray-curable hard coat agent for producing a hard coat layer capable of achieving both high scratch resistance, stain resistance, and bending resistance.

  The embodiment of the present invention will be described in detail below, but the explanation of the constituent requirements described below is an example (representative example) of the embodiment of the present invention, and the present invention does not exceed the gist thereof. It is not limited to the content.

  Hereinafter, each of the elements constituting the present invention will be described in detail.

The present invention contains an alumina particle (A), an acrylate (B) having a perfluoroalkylene group, and a polyfunctional urethane acrylate (C), and is characterized by satisfying the following (1) and (2): The present invention relates to an energy ray-curable hard coating agent.
(1) The crystal structure of the alumina particles (A) is θ-type and / or α-type, and the primary particle diameter is 5 to 50 nm.
(2) In 100 mass% of solid content of a hard-coat agent, 5-50 mass% of alumina particles (A) and 0.05-5 mass% of acrylates (B) are contained.
(However, multifunctional urethane acrylate (C) does not include acrylate (B) having a perfluoroalkylene group.)
In the hard coat agent of the present invention, high scratch resistance is realized by the fact that the crystal structure of the alumina particles (A) is θ-type and / or α-type. At the same time, by using the urethane acrylate (C), the flexibility is imparted to the hard coat layer to improve the flexibility. Furthermore, antifouling property improves by using the acrylate (B) which has a perfluoro alkylene group. These have a synergetic effect that their simultaneous use does not degrade their properties and characteristics.

<Active energy ray-curable hard coating agent>
The active energy ray-curable hard coat agent refers to a composition containing a resin component which is cured through a crosslinking reaction or the like by irradiation of active energy rays such as ultraviolet rays and electron beams. After application of the active energy ray-curable hard coat agent, the layer is cured by irradiation with active energy rays such as ultraviolet rays and electron beams to form a hard coat layer. As the resin, an ultraviolet curable resin, an electron beam curable resin and the like can be mentioned as a typical one, but a resin cured by ultraviolet irradiation is preferable from the viewpoint of excellent mechanical film strength (scratch resistance, pencil hardness). Examples of such a resin include resins having a plurality of acrylate groups, acrylate monomers, and the like.

In the following description, (meth) acrylate means methacrylate and acrylate, and (meth) acrylic means methacrylic and acrylic.

<Alumina particles (A)>
In the present invention, the crystal structure of alumina (Al ₂ O ₃ ) particles (A) is θ-type and / or α-type, and the primary particle diameter is 5 to 50 nm. This is to reduce the haze and coloring of the hard coat layer. Further, the primary particle diameter means a value obtained by transmission electron microscope measurement. As a value, it is preferable to measure the value of 5 points or more in order to take an average value, and to take an average value.
The alumina particles (A) preferably have a BET specific surface area of 10 to 100 m ² / g. Further, it is preferable that _Al 2 _{O 3} purity is 99.5% or more. By being in the corresponding range, the abrasion resistance of the hard coat layer is improved. The alumina particles (A) are required to be contained in an amount of 5 to 50% by mass, and preferably 10 to 40% by mass, in the total solid mass of the hard coat agent. In addition, solid content means the total mass of the non-volatile component in a hard-coat agent.

<Acrylate (B) Having Perfluoroalkylene Group>
The acrylate (B) having a perfluoroalkylene group can impart antifouling properties by a fluorine group, and the acrylate group contributes to the hard coat property by being responsible for the curability. Therefore, it is necessary to contain 0.05-5 mass% in solid content gross weight of a hard-coating agent. The acrylate (B) having a perfluoroalkylene group refers to one containing a perfluoroalkylene group and having a (meth) acrylate group. In addition, a perfluoro alkylene group means the alkylene group substituted by the fluorine atom.
The acrylate (B) is preferably contained in an amount of 0.3 to 3% by mass in the total mass of the hard coat agent solid content. The number of (meth) acrylate groups (referred to as the number of functional groups) in the monomolecular structure of the acrylate (B) is preferably 1 to 6, and more preferably 2 to 6. The weight average molecular weight is preferably 400 to 5,000, and more preferably 500 to 2,000. The acrylate (B) is preferably a urethane acrylate having a urethane bond group. This is to contribute to the flexibility or scratch resistance of the hard coat layer. The carbon number of the perfluoroalkylene group is preferably 1 to 10. Moreover, it is preferable to have the perfluoro alkylene oxy structural unit represented by following Chemical formula (1).
Chemical formula (1)

_{- (CF 2 -CF 2 -O)} n - (n is an integer of from 1 to 10.)

As acrylate (B), DIC Corporation make, Megafuck RS-75, Megafuck RS-76-E, Megafuck RS-90, Shin-Etsu Chemical Co., Ltd. make, KY-1203 etc. are mentioned. be able to.

<Multifunctional urethane acrylate (C)>
The polyfunctional urethane acrylate (C) refers to an oligomer having a urethane bond and having a (meth) acrylate group. However, those having a perfluoroalkylene group are excluded. The content of the urethane acrylate resin is preferably 5 to 95% by mass, and more preferably 50 to 95% by mass, in 100% by mass of the hard coat agent solid content. Moreover, it is preferable that a weight average molecular weight is 500-15000 from a viewpoint of coating property. The polyfunctional urethane acrylate (C) preferably has 4 to 15 functional groups. The number of functional groups is as defined above. Moreover, it is preferable that it is 600-15000, and, as for a weight average molecular weight, it is more preferable that it is 1000-5000. The weight average molecular weight means a value measured by gel permeation chromatography (GPC). The mass ratio ((A) / (C)) of the alumina particle (A) to the polyfunctional urethane acrylate (C) is preferably 10/90 to 90/10, and is 10/90 to 50/50. Is more preferred.

  The polyfunctional urethane acrylate (C) is obtained, for example, by reacting a diisocyanate and a (meth) acrylate having a hydroxyl group, and an isocyanate group-containing one obtained by reacting a polyol and a polyisocyanate under conditions of excess isocyanate group. There are those obtained by reacting a urethane prepolymer with (meth) acrylates having a hydroxyl group. Alternatively, it can also be obtained by reacting a hydroxyl group-containing urethane prepolymer obtained by reacting a polyol and a polyisocyanate under conditions of an excess of hydroxyl groups with (meth) acrylates having an isocyanate group.

Below, it shows about the manufacturing method of urethane acrylate, but it is an example and it is not limited to these. For example, urethane acrylate can be obtained by stirring diisocyanate and hydroxyl group-containing (meth) acrylate under conditions of 60 to 100 ° C. and 4 to 8 hours under an oxygen atmosphere in the presence of a suitable urethanization catalyst.
Specific examples of the urethanization catalyst include copper naphthenate, cobalt naphthenate, zinc naphthenate, dibutyltin dilaurate, triethylamine, 1,4-diazabicyclo [2.2.2] octane, 2,6,7-trimethyl -1,4-diazabicyclo [2.2.2] octane and the like can be mentioned. Among these, dibutyltin dilaurate and the like are particularly preferable.

Examples of the above diisocyanates include aliphatic diisocyanates and aromatic diisocyanates. Examples of aliphatic diisocyanates include hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, and the like as aromatic diisocyanates. Are, for example, toluene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, etc., and the bonding position of the isocyanate group to the aromatic group may be any of ortho position, meta position and para position. The diisocyanate may form an isocyanurate ring as a trimer.
Among them, preferred are tolylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, hexamethylene diisocyanate, and isocyanurate of hexamethylene diisocyanate.

As the hydroxyl group-containing (meth) acrylate, trimethylolpropane di (meth) acrylate, trimethylolethane di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol penta (meth) acrylate (meth) acrylic acid 2- Hydroxyethyl, 1-hydroxypropyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 1-hydroxybutyl (meth) acrylate, 2- (meth) acrylate Hydroxybutyl, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, cyclohexane dimethanol mono ( Ta) acrylic acid ester, 10-hydroxydecyl (meth) acrylic acid, 12-hydroxy lauryl (meth) acrylic acid, ethyl (meth) acrylate-α- (hydroxymethyl), glycerol monofunctional (meth) acrylate, or These (meth) acrylates and (meth) acrylic acid esters having a hydroxyl group at the end by ring-opening addition of ε-caprolactone lactone, ethylene oxide, propylene oxide, butylene oxide, etc. to the above hydroxyl group-containing (meth) acrylate Examples thereof include hydroxyl group-containing (meth) acrylic acid esters such as alkylene oxide addition (meth) acrylic acid esters to which alkylene oxide is repeatedly added.
Among them, those containing at least one selected from trimethylolpropane di (meth) acrylate, trimethylolethane di (meth) acrylate, pentaerythritol tri (meth) acrylate and dipentaerythritol penta (meth) acrylate are preferable.

The following can be illustrated as a commercial item of the above-mentioned polyfunctional urethane acrylate having 4 to 15 functional groups and a molecular weight of 500 to 15,000.
Shin Nakamura Chemical Industry Co., Ltd. product: NK oligo U6LPA, NK oligo U10PA, NK oligo U10HA, NK oligo UA-33H, NK oligo UA-53H, Negami Co., Ltd. product: art resin UN-3320HA, art resin UN- 3320HB, Art resin UN-3320HC, Art resin UN-3320HS, Art resin UN-9000H, Art resin UN-901T, Art resin UN-904, Art resin UN-905, Art resin UN-952, Art resin HDP, Art resin HDP-3, Art Resin H61, manufactured by Japan Synthetic Chemical Industry Co., Ltd .: Purple UV-7600B, Purple UV-7610B, Purple UV-7620EA, Purple UV-7630B, Purple UV-1700B, Purple UV-6300B, Purple UV- 7640 , Shiko UT-5670, Shiko UV-5671, manufactured by Kyoeisha Chemical Co., Ltd.: UA-306H, UA-306T, UA-306I, MIWON manufactured by: PU610, PU620, MU9800.

<Polyfunctional ester acrylate (D)>
The active energy ray-curable hard coat agent preferably further contains a polyfunctional ester acrylate (D). Polyfunctional ester acrylate (D) refers to an oligomer having a (poly) ester structure and having a (meth) acrylate group. However, those having a perfluoroalkylene group and a urethane bonding group are excluded. Among them, those having 4 to 15 functional groups and a molecular weight of 600 to 15,000 are preferable.

As such a polyfunctional ester acrylate (D), for example, a condensation product of a polybasic acid and a polyhydric alcohol, and a hydroxyl group-containing (meth) acrylate, and a condensation product of a polybasic acid and a hydroxyl group-containing (meth) acrylate are preferably mentioned.
Examples of the polybasic acids include aliphatic, alicyclic and aromatic ones, each of which can be used without particular limitation. For example, as aliphatic polybasic acids, oxalic acid, malonic acid, succinic acid, succinic anhydride, adipic acid, sebacic acid, azelaic acid, maleic acid, fumaric acid, dodecanedioic acid, pimelic acid, citraconic acid, glutaric acid Preferred examples include itaconic acid, succinic anhydride, and maleic anhydride.

Examples of the polyhydric alcohol include dihydric alcohols and alcohols having a valence of 3 or more. Examples of the dihydric alcohols include neopentyl glycol, 3-methyl-1,5-pentanediol, and 2,4-diethyl-1,5. -Pentanediol, 2-methyl-1, 8-octanediol, 3,3'-dimethylolheptane, 2-butyl-2-ethyl-1,3-propanediol, butylethylpentanediol, 2-ethyl-1, Those obtained by introducing two or more hydroxyl groups into branched alkanes such as 3-hexanediol and trimethylolpropane are preferable in terms of adhesion to a substrate, heat resistance, and the like.
As the tri- or higher-valent alcohol, glycerin, trimethylolpropane, pentaerythritol, dipentaerythritol and the like are preferable, and may be used in combination with a dihydric alcohol.

As a manufacturing method of polyfunctional ester acrylate (D), polybasic acid and polyhydric alcohol are polycondensed by a well-known method, polyester is obtained, and the carboxyl group residue and the hydroxyl group of the said hydroxyl-containing (meth) acrylate are obtained. By condensation reaction, the target polyfunctional ester acrylate (D) can be obtained. Alternatively, the desired polyfunctional ester acrylate (D) can be obtained by condensation reaction of the polybasic acid and the hydroxyl group of the hydroxyl group-containing (meth) acrylate. However, aspects of the production method are not limited to these.

Examples of the hydroxyl group-containing (meth) acrylate include the same as above, among which trimethylolpropane di (meth) acrylate, trimethylolethane di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol penta ( Those containing at least one selected from meta) acrylates are preferred.

The polyfunctional ester acrylate (D) preferably contains an ester structure derived from a carboxylic acid having a ring structure of 6 or more carbon atoms. Examples of the ring structure having 6 or more carbon atoms include, but are not limited to, a cyclohexane structure, a cyclohexene structure, a benzene structure and the like. Examples of the carboxylic acid having a ring structure having 6 or more carbon atoms include cyclohexanedicarboxylic acid, cyclohexenedicarboxylic acid, phthalic acid, benzenetetracarboxylic acid and biphenyltetracarboxylic acid.

  The number of functional groups of the polyfunctional ester acrylate is preferably 5 to 10, and the weight average molecular weight is preferably 500 to 15,000. The multifunctional ester acrylate (D) has the mass ratio (C) / (D) of the polyfunctional urethane acrylate (C) to the polyfunctional ester acrylate (D) in the total solid content of the active energy ray-curable hard coat agent. Is preferably 10/90 to 99/1, and more preferably 70/30 to 98/2.

<Other monomer>
The active energy ray-curable hard coat agent of the present invention may further contain a hexafunctional or less functional (meth) acrylate monomer having a molecular weight of less than 600 as a monomer. For example, examples of the 5 to 6 functional (meth) acrylate monomer include dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate, and examples of the 3 to 4 functional (meth) acrylate monomer include, for example, ditrimethylol Propane tetraacrylate, trimethylolpropane tri (meth) acrylate, tris (2-hydroxyethyl) isocyanurate triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate may be mentioned.

Examples of the difunctional (meth) acrylate monomer include trimethylolpropane di (meth) acrylate, dicyclopentanyl dimethylene di (meth) acrylate and / or 5-ethyl-2- (2-hydroxy-1,1-). Dimethylethyl) -5- (hydroxymethyl) -1,3-dioxadi (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,3-butanediol di ( Meta) acrylate, 1,4-butanediol di (meth) acrylate, 1,9-nonanediol di (meth) methacrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) Methacrylate, polyethylene Glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, glycerin dimethacrylate, hexanediol di (meth) acrylate, dimethylol tricyclode Candi (meth) acrylate etc. are mentioned. Preferred examples thereof include trimethylolpropane tri (meth) acrylate, EO-modified trimethylol triacrylate, PO-modified trimethylol tri (meth) acrylate and the like. These (meth) acrylates may be used alone or in combination of two or more.

Examples of monofunctional (meth) acrylate monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, n-stearyl (meth) acrylate and n-butoxy Ethyl (meth) acrylate, cyclohexyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, isobornyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate and the like.

<Organic solvent>
The active energy ray-curable hard coat agent of the present invention may contain an organic solvent as a liquid medium. The organic solvent to be used is preferably a mixed solvent, and is preferably an aromatic organic solvent such as toluene and xylene, a ketone organic solvent such as methyl ethyl ketone and methyl isobutyl ketone, ethyl acetate, n-propyl acetate, isopropyl acetate and isobutyl acetate Known organic solvents such as ester organic solvents, alcohol organic solvents such as methanol, ethanol, n-propanol, isopropanol and n-butanol, and glycoether organic solvents such as propylene glycol monomethyl ether can be used. In particular, it is preferable to contain a glycol ether type organic solvent.

Examples of the glycol ether organic solvent include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol mono-n-propyl ether, ethylene glycol monoisopropyl ether, ethylene glycol dipropyl. Ether, ethylene glycol monobutyl ether, ethylene glycol monoisobutyl ether, ethylene glycol dibutyl ether, ethylene glycol isoamyl ether, ethylene glycol monohexyl ether, ethylene glycol mono 2-ethylhexyl ether, methoxyethoxyethanol, ethylene glycol monoallyl ether etc Ethers
Propylene glycol ethers such as propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether and butoxypropanol;
Among them, methyl propylene glycol and 3-methoxy-1-butanol are preferable.

<Photoinitiator>
The active energy ray-curable hard coat agent preferably further contains a photopolymerization initiator. The photopolymerization initiator is not particularly limited as long as it has a function capable of initiating vinyl polymerization of (meth) acryloyl group for forming an active energy ray cured film by photoexcitation, for example, a monocarbonyl compound initiator, It is preferable to contain at least one selected from dicarbonyl compound initiators, acetophenone compound initiators, benzoin ether compound initiators, acyl phosphine oxide compound initiators, and amino carbonyl compound initiators.
Commercial products of the photopolymerization initiator include Omnirad 73, 481, 659, 248, 264, 4817 manufactured by IGM Resins, BDK, TPO, TPO-L, 380, Omnipol 910, BP, 2702, Esacure One, 1001M, A198, KIP150, etc. Can be mentioned.

  The photopolymerization initiator is not limited to the above compounds, and may be any one as long as it has an ability to initiate polymerization by ultraviolet light. These photopolymerization initiators may be used alone or in combination of two or more. The amount of the photopolymerization initiator to be used is not particularly limited, but it is 1 to the total mass of solids excluding metal oxides in the active energy ray-curable hard coat agent for forming the hard coat layer in the present invention. It is preferable to use in the range of 20 mass%. In addition, a well-known organic amine etc. can also be added as a sensitizer. Furthermore, in addition to the above radical polymerization initiator, an initiator for cationic polymerization can also be used in combination.

<Other combination resin>
The active energy ray-curable hard coat agent in the present invention may contain other resins, and is not limited to the following, but other photo-curable resins such as epoxy acrylates, chlorinated polypropylene resins, polyolefin resins, etc. Ethylene-vinyl acetate copolymer resin, vinyl acetate resin, alkyd resin, polyvinyl chloride resin, rosin resin, rosin modified maleic resin, terpene resin, phenol modified terpene resin, ketone resin, cyclized rubber, chlorinated rubber, butyral , Petroleum resins, and modified resins thereof. These resins may be used alone or in combination of two or more, and the content thereof is not particularly limited as long as the effects of the present invention are not impaired, but the active energy ray-curable hard coat agent 1 to 20 weight% is preferable in the resin solid content gross weight of

<Additives>
The active energy ray-curable hard coat agent of the present invention can further contain various additives as long as the objects and effects of the present invention are not impaired. Specifically, polymerization inhibitors, photosensitizers, leveling agents, surfactants, antibacterial agents, antiblocking agents, plasticizers, UV absorbers, infrared absorbers, antioxidants, silane coupling agents, conductivity Polymers, conductive surfactants, inorganic fillers, pigments, dyes and the like can be mentioned.

<Production of active energy ray-curable hard coating agent>
The active energy ray-curable hard coat agent of the present invention has no problem as long as it can be stirred, mixed or dispersed uniformly, for example, an acrylate particle having an alumina particle (A) perfluoroalkylene group (A) constituting an active energy ray-curable hard coat agent B) and Multifunctional Urethane Acrylate (C) In addition, optionally, multifunctional ester acrylate (D) and other monomers are produced by uniformly stirring using a predetermined stirrer disper, homogenizer, triple roll, sand mill, gamma mill, etc. be able to.
In addition, the alumina particles (A) may be blended in advance using, for example, a pentaerythritol acrylate compound, an acrylate resin such as urethane acrylate or polyester acrylate, and an organic solvent, or the like, or commercially available organic particles. A solvent dispersion or the like may be blended and used.

<Production of hard coat layer>
Next, a method of producing a hard coat layer formed by curing an active energy ray-curable hard coat agent will be described. The method for producing the hard coat layer includes, for example, applying an active energy ray-curable hard coat agent to a substrate, and irradiating the active energy ray to cure the active energy ray curable hard coat agent on the substrate Process. More specifically, the active energy ray-curable hard coat agent is applied to a substrate so that the film thickness after drying is preferably 0.1 to 30 μm, more preferably 1 to 10 μm, and then cured. It can be formed by

  As a coating method, a known method can be used, for example, a method using a lot or a wire bar, or various coating methods such as microgravure, gravure, die, curtain, lip, slot, spin or spray, etc. be able to.

The curing method can be carried out by irradiating an active energy ray such as an ultraviolet ray, an electron beam or a visible ray having a wavelength of 400 to 500 nm, using a known technique. For example, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, a gallium lamp, a xenon lamp, a carbon arc lamp or the like can be used as a UV light source (light source) of visible light having a wavelength of 400 to 500 nm. As the electron beam source, a thermionic radiation gun, an electrolytic radiation gun or the like can be used. The integrated light quantity of the active energy ray to be irradiated is preferably in the range of 50 to 1000 mJ / cm ² from the viewpoint of easy control in the process. Heat treatment by infrared rays, far infrared rays, hot air, high frequency heating or the like can be used in combination with these active energy ray irradiations.

  The hard coat layer may be formed by applying an active energy ray-curable hard coat agent to a substrate and curing it after natural or forced drying, or after applying and curing Although natural or forced drying may be carried out, it is more preferable to carry out curing treatment after natural or forced drying. In particular, in the case of curing with an electron beam, it is more preferable to perform a curing treatment after natural or forced drying in order to prevent the inhibition of curing by water or the decrease in strength of the coating film due to the residual organic solvent. The timing of the curing treatment may be simultaneous with the coating or may be after the coating.

<Base material>
Examples of the substrate of the present invention include, but are not limited to, polyester films, triacetyl cellulose films, polyolefin films, cycloolefin films, acrylic films, polycarbonate films and the like. In particular, polyester films, particularly polyethylene terephthalate (PET) films are preferably used on the display surface. The thickness of the substrate may be appropriately selected according to the desired application, but a range of 20 μm to 300 μm is appropriate, a range of 50 μm to 250 μm is preferable, and a range of 50 μm to 200 μm is more preferable. In addition, an acrylic / polycarbonate sheet is particularly preferably used for the rear case. The thickness of the substrate may be appropriately selected according to the desired application, but a range of 200 μm to 800 μm is appropriate, and a range of 200 μm to 500 μm is preferable.

  The above-mentioned base material may further have a layer consisting of an organic substance and / or an inorganic substance on the surface, and a specific example thereof is an easy-adhesion layer for increasing the adhesion to other layers. As an easily bonding layer, various things, such as a corona discharge treatment, a UV-ozone treatment, a plasma treatment, a primer treatment, may be mentioned, and may be treated in combination.

EXAMPLES Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited to these examples. In the present invention, parts and% represent parts by weight and% by weight unless otherwise noted.

(Average particle size)
Measured by transmission electron microscopy, an average value of 10 arbitrarily selected primary particle diameters was used.
The transmission electron microscope used was H-9500 manufactured by Hitachi High-Technologies Corporation.

(Specific surface area)
It was determined according to the method described in JIS Z 8830: 2001.

(Acid number)
It carried out by the potentiometric titration method of JISK0070, and set it as the acid value (mgKOH / g) in solid content.

(Weight average molecular weight)
The weight average molecular weight was determined by measuring molecular weight distribution using a GPC (gel permeation chromatography) apparatus (HLC-8220 manufactured by Tosoh Corporation), and determining polystyrene as a converted molecular weight using a standard substance. The measurement conditions are shown below.
Column: The following columns were connected in series and used.
Tosoh Corporation TSKgel SuperAW2500
Tosoh Corporation TSKgel SuperAW 3000
Tosoh Corporation TSKgel SuperAW 4000
Tosoh Corporation TSKgel guardcolumn SuperAWH
Detector: RI (differential refractometer)
Measurement conditions: Column temperature 40 ° C
Eluent: tetrahydrofuran flow rate: 1.0 mL / min

Synthesis Example 1 <Polyfunctional Urethane Acrylate PU3>
In a flask equipped with a stirring blade, a thermometer, a reflux condenser, and an air introducing tube, 120 parts of polyester polyol having a molecular weight of 3000, which is a condensation product of adipic acid and neopentyl glycol, and 18 parts of isophorone diisocyanate are mixed. Further, normal propyl acetate as a solvent was added so that the solid content was 80%, and the reaction was carried out under nitrogen atmosphere at 80 ° C. for 5 hours to synthesize a urethane prepolymer. Thereafter, the inside of the flask is replaced with air, and 200 ppm of methoxyhydroquinone is blended, and a mixture of pentaerythritol triacrylate and pentaerythritol tetraacrylate in a weight ratio of 70:30 (trade name: "Alonix M306" Toagosei Co., Ltd. 34 parts were added, and the mixture was heated and stirred at a temperature of 80 ° C. under an air atmosphere for 4 hours to obtain a mixture PU3. PU3 had 6 functional groups and a weight average molecular weight of 6000.

Synthesis Example 2 <Polyfunctional Urethane Acrylate PU4>
100 parts of isocyanurate of hexamethylene diisocyanate (NCO group: 3 pieces) and 69 parts of hydroxyethyl acrylate are mixed in a flask equipped with a stirring blade, thermometer, reflux condenser, and an air introducing pipe, and further normal acetic acid as a solvent Propyl was mixed to a solids content of 60%. Thereafter, 200 ppm of methoxyhydroquinone was added, and the mixture was heated and stirred for 6 hours while blowing in air at a temperature of 90 ° C. to obtain a mixture PU4. PU4 had 3 functional groups and a weight average molecular weight of 1,000.

Synthesis Example 4 <Polyfunctional Polyester Acrylate PE1>
A 4-neck flask equipped with a stirrer, a reflux condenser, a dry air inlet, and a thermometer. 80.0 parts of 3,3 ', 4,4'-biphenyltetracarboxylic acid dianhydride and a pentamer having a hydroxyl value of 122 mg KOH / g. 250.0 parts of erythritol triacrylate (pentaerythritol triacrylate manufactured by Nippon Kayaku Co., Ltd. product name: KAYARAD PET-30, containing pentaerythritol tetraacrylate as a by-product), 0.24 parts of methylhydroquinone, and 217.8 parts of cyclohexanone Charged and heated to 60 ° C. Then, 1.65 parts of 1,8-diazabicyclo [5.4.0] -7-undecene was added as a catalyst and stirred at 90 ° C. for 8 hours. Thereafter, 78.3 parts of methacrylic glycidyl ether and 54.0 parts of cyclohexanone are added, and then 2.65 parts of dimethylbenzylamine is added as a catalyst, and the mixture is stirred at 100 ° C. for 6 hours, and the reaction is carried out periodically while continuing the reaction. The acid value was measured, and when the acid value became 5.0 mg KOH / g or less, the reaction was cooled by cooling to room temperature. The obtained resin varnish was pale yellow and transparent, and obtained a mixture PE1 of polyester acrylate and pentaerythritol tetraacrylate having a solid content of 60% (solid mass ratio of polyester acrylate: pentaerythritol tetraacrylate = 76: 24). The polyester acrylate had a functionality of 8 and a weight average molecular weight of 3,500.

Synthesis Example 5 <Polyfunctional Polyester Acrylate PE2>
A 4-neck flask equipped with a stirrer, reflux condenser, dry air inlet and thermometer, 100 parts of a polyester diol having a number average molecular weight of 1000 and a pentaerythritol having a hydroxyl value of 122 mg KOH / g, which is a condensate of adipic acid and neopentyl glycol. 92 parts of triacrylate (trade name: KAYARAD PET-30, manufactured by Nippon Kayaku Co., Ltd., containing pentaerythritol tetraacrylate as a by-product) and 0.01 part of tetrabutyl titanate were mixed. Further, methylhydroquinone was added to 250 ppm, and toluene was added to a solid content of 70% and stirred. The temperature was raised to 105 ° C., and dehydration reaction was carried out in a water drain pipe while performing oxygen bubbling. When the acid value became 5.0 mg KOH / g or less, toluene as a solvent was removed under reduced pressure and then cooled to 40 ° C. to obtain polyester acrylate PE2 (solid content mass ratio polyester acrylate: pentaerythritol tetraacrylate = 83: 17 ). The polyester acrylate had a functional group number of 6, and a weight average molecular weight of 2,300.

(Example 1) <Production of active energy ray-curable hard coating agent S1>
Alumina particles (4) (manufactured by Sumitomo Chemical Co., Ltd. alumina particles θ-type crystal, primary particle diameter 10 nm, BET specific surface area 73 m ² / g) 20 parts, PU1 as multifunctional urethane acrylate (Kyoeisha Chemical Co., Ltd. product name UA-510H) 70 parts, 4 parts of PE 1 shown in Synthesis Example 4 as a multifunctional polyester acrylate, and 200 parts of propylene glycol monomethyl ether as an organic solvent are mixed and dispersed by stirring in a sand mill to obtain a uniform slurry. The Further, 4 parts of ESACURE ONE (oligo [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propanone] manufactured by IGM Resins) as a photopolymerization initiator, acrylate having a perfluoroalkylene group (DIC One part of urethane acrylate (n = 4 to 6) weight average molecular weight 1000 having a functional group of 2 having RS-90 "-(CF ₂ -CF ₂ -O) _n- " structure, propylene glycol monomethyl ether as an organic solvent Were adjusted to a solid content of 40% to obtain an active energy ray-curable hard coating agent S1.

(Examples 2 to 13) <Production of active energy ray-curable hard coating agents S2 to 13>
An active energy ray-curable hard coating agent was prepared in the same manner as in Example 1 except that the raw materials and composition ratios described in Table 1 were used. The abbreviations in the table indicate the following.
(Alumina particles (A))
Alumina particles (1): manufactured by Sumitomo Chemical Co., Ltd. Alumina particles α-type crystal Primary particle diameter 30 nm
Alumina particles (2): Sumitomo Chemical Co., Ltd. Alumina particles α-type crystal Primary particle diameter 50 nm
(Acrylate (B) having a perfluoroalkylene group)
FA1: Daikin Industries 3-perfluorohexyl 2-hydroxypropyl methacrylate (weight average molecular weight 500)
(Multifunctional urethane acrylate (C))
PU1: manufactured by Kyoeisha Chemical Co., Ltd. Product name UA-510H Urethane acrylate functional group number 10 consisting of hexamethylene diisocyanate and dipentaerythritol pentaacrylate Weight average molecular weight 1800
PU 2: manufactured by Kyoeisha Chemical Co., Ltd. Product name UA-306I Urethane acrylate consisting of isophorone diisocyanate and pentaerythritol triacrylate Number of functional groups 6 Weight average molecular weight 900
PU5: manufactured by Kyoeisha Chemical Co., Ltd. Product name UF 8001-G Urethane acrylate Functional group number 2 Weight average molecular weight 4500

(Comparative Examples 1 to 9) <Production of Active Energy Ray-Hardenable Hard Coat Agents R1 to R9>
An active energy ray-curable hard coating agent was prepared in the same manner as in Example 1 except that the raw materials and composition ratios described in Table 1 were used. The abbreviations in the table indicate the following.
(Alumina particles)
Alumina particles (3): Sumitomo Chemical Co., Ltd. Alumina particles α-type crystal Primary particle diameter 70 nm
Alumina particles (5): manufactured by Sumitomo Chemical Co., Ltd. Alumina particles γ-type crystal Primary particle diameter 20 nm
Alumina particles (6): manufactured by Taki Chemical Co. Alumina particles amorphous crystal Primary particle diameter 20 nm
(Other metal oxide particles)
Zirconia: ITEC Corporation Zirconia particle primary particle diameter 20 nm
Silica particle: CIK Nanotech manufactured silica particle Primary particle diameter 10 nm
(Multifunctional urethane acrylate)
PU5: manufactured by Kyoeisha Chemical Co., Ltd. Product name UF-8001-G bifunctional urethane acrylate weight average molecular weight 4500

(Example 14) <Production of laminate SS1>
A film thickness after drying was applied to a 125 μm thick easy-bonding-treated polyester (PET) film (“Lumirror U483” manufactured by Toray Industries, Inc.) using a bar coater # 4 with an active energy ray-curable hard coating agent S1. After coating to have a thickness of 5 μm, the laminate was irradiated with ultraviolet light of 500 mJ / cm ² with a high pressure mercury lamp to form a laminate SS1.

(Examples 15 to 26) <Production of Laminates SS2 to SS13>
Laminates SS2 to SS13 were produced in the same manner as in Example 1 except that the active energy ray-curable hard coating agents S2 to S13 described in Table 1 were used.

(Comparative Examples 10 to 18) <Production of Laminates RR1 to RR9>
Laminates RR1 to RR9 were prepared in the same manner as in Example 1 except that the active energy ray-curable hard coat agents R1 to R9 described in Table 1 were used.

[Evaluation]
Using the active energy curable hard coat agents S1 to S13 (examples) and R1 to R9 (comparative examples) obtained above and the laminates SS1 to SS13 (examples) and RR1 to RR9 (comparative examples) The following evaluations were made. The evaluation results are shown in Tables 2 and 3.

<Scratch resistance>
Each of the laminates SS1 to SS13 (examples) and RR1 to RR9 (comparative examples) is set in the Gakushin tester, and 5000 times with a load of 1 kg / cm ² using steel wool No. 0000. I scratched. The degree of scratching of the taken out laminate was judged according to the following five-step visual evaluation.
[Evaluation criteria]
5: There are no scratches. (Very good)
4: One or two scratches are attached. (Good)
3: 3 to 10 scratches are attached. (Slightly poor)
2: There are scratches on 11 or more. (Defective)
1: The coating film is peeled off and the substrate film is exposed. (Very bad)
In addition, 4 and 5 are levels which have no problem in practical use.

<Water contact angle (initial)>
The water contact angle was measured using laminates SS1 to SS13 (examples) and RR1 to RR9 (comparative examples), each using a fully automatic contact angle meter DM-701 manufactured by Kyowa Interface Chemicals Co., Ltd. The contact angle values were judged according to the following five-step visual evaluation. In addition, this evaluation was implemented as a substitute evaluation of antifouling property. It is understood that the larger the contact angle, the easier it is to repel water and it is less likely to get dirty.
[Evaluation criteria]
5: Contact angle is 105 ° or more (very good)
4: The contact angle is 100 ° or more and less than 105 ° (good)
3: The contact angle is 90 ° or more and less than 100 ° (slightly poor)
2: Contact angle is 80 ° or more and less than 90 ° (defect)
1: Contact angle less than 80 ° (very poor)
In addition, 4 and 5 are levels which have no problem in practical use.

<Water contact angle (after scratch resistance test)>
Using laminates SS1 to SS13 (examples) and RR1 to RR9 (comparative examples), the water contact angle is measured for each sample after the above scratch resistance test, and the obtained contact angle values It was judged according to the visual evaluation of the stage. In addition, this evaluation was implemented as a substitute evaluation of antifouling property. It is understood that the larger the contact angle, the easier it is to repel water and it is less likely to get dirty.
[Evaluation criteria]
5: Contact angle is 100 ° or more (very good)
4: The contact angle is 90 ° or more and less than 100 ° (good)
3: The contact angle is 80 ° or more and less than 90 ° (slightly poor)
2: Contact angle is 70 ° or more and less than 80 ° (defect)
1: Contact angle less than 70 ° (very poor)
In addition, 4 and 5 are levels which have no problem in practical use.

<Flexibility>
Flexibility test when using the laminates SS1 to SS13 (examples) and RR1 to RR9 (comparative examples) and bending them with the laminate surface of the active energy ray-curable hard coating agent in the laminates facing outside Was evaluated using a coating film bending tester (PI-801 manufactured by Tester Sangyo Co., Ltd.). The mandrel diameter at which no cracking occurred was judged according to the following five-step visual evaluation.
[Evaluation criteria]
5: Mandrel diameter less than φ10 mm (very good)
4: The mandrel diameter is φ10 mm or more and less than 15 mm (good)
3: The mandrel diameter is φ15 mm or more and less than 20 mm (slightly poor)
2: The mandrel diameter is φ20 mm or more and less than 25 mm (defect)
1: The mandrel diameter is 25 mm or more (very poor)
In addition, 4 and 5 are levels which have no problem in practical use.

Transparency
The transparency of each of the laminates R1 to R20 (examples) and RR1 to RR10 (comparative examples) was evaluated by the haze (turbidity) of the coating. The haze value was measured using a haze meter SH7000 manufactured by Nippon Denshoku Industries Co., Ltd. Based on the obtained haze value, transparency was judged according to the following five-step visual evaluation.
[Evaluation criteria]
5: Haze value less than 0.5 (very good)
4: Haze value 0.5 or more and less than 1.0 (good)
3: Haze value 1.0 or more and less than 2.0 (slightly poor)
2: Haze value 2.0 or more and less than 3.0 (defect)
1: Haze value 3.0 or more (very poor)
In addition, 4 and 5 are levels which have no problem in practical use.

  From the results of Table 1, in the examples, the scratch resistance, the stain resistance, the flexibility, and the transparency were all excellent. In particular, the scratch condition is usually about 100 times of scratching as the basic condition, and 5000 times of scratching is also good and shows a remarkable effect. Furthermore, flexibility was also compatible and showed unexpected performance.

  On the other hand, in the comparative example, any one of the scratch resistance, the stain resistance, the flexibility, and the transparency is in a trade-off relationship, and the performance is insufficient in at least one or more items.

Claims (5)

Active energy ray-curable hard material comprising alumina particles (A), acrylate (B) having a perfluoroalkylene group, and polyfunctional urethane acrylate (C) and satisfying the following (1) and (2) Coating agent.
(1) The crystal structure of the alumina particles (A) is θ-type and / or α-type, and the primary particle diameter is 5 to 50 nm.
(2) In 100 mass% of solid content of a hard-coat agent, 5-50 mass% of alumina particles (A) and 0.05-5 mass% of acrylates (B) are contained.
(However, multifunctional urethane acrylate (C) excludes acrylate (B) having a perfluoroalkylene group.) The hard coat agent according to claim 1, wherein the number of functional groups of the polyfunctional urethane acrylate (C) is 4 to 15, and the molecular weight is 500 to 15,000. The hard coat agent according to claim 1 or 2, further comprising a polyfunctional ester acrylate (D). The hard coat agent according to claim 3, wherein the polyfunctional ester acrylate (D) has an ester structure derived from a carboxylic acid having a ring structure having 6 or more carbon atoms. A laminate comprising a base material and a hard coat layer comprising the hard coat agent according to any one of claims 1 to 4.