JPWO2015046047A1 - Hard coat film and display element with surface member - Google Patents

Abstract

Provided a technology that can simultaneously satisfy antiglare properties, Newton's ring prevention properties, and sparkle prevention properties, and can increase coating film hardness. In the display element front film 1, an optical functional layer 12 is laminated on a transparent substrate 11. The optical functional layer 12 is composed of a cured product of a specific curable composition, and has a plurality of convex portions due to the matting agent described later on the surface. The curable composition contains a resin component and a matting agent. The resin component includes an ionizing radiation curable resin and one or more of the following (a) and (b), and the content in the total resin component is ionizing radiation curable resin: 50% by weight or more and 85% by weight. Less than the following (a) and (b): more than 15% by weight and 50% by weight or less. (A) A compound having a photocurable unsaturated group introduced into a thermoplastic resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more, (b) a photocurable resin in a thermosetting resin. A compound having an unsaturated group introduced, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more.

Description

  The present invention includes a hard coat film such as a display element front film suitable for use on a surface member or the like disposed on the screen of various display elements, and a surface member on which the surface member including the film is disposed on the screen. The present invention relates to a display element.

  On the screen of various display elements (liquid crystal display elements, plasma display elements, etc.), in order to protect the surface and prevent the difficulty of visual recognition due to glare caused by reflection of external light on the screen, An antiglare film may be disposed. The surface of the antiglare film is subjected to surface unevenness treatment, and the surface of the antiglare film is formed by providing a hard coat layer containing particles as a matting agent on the substrate as an antiglare layer. Can be applied.

  However, in recent years, various display elements have been improved in definition. As a result, when a conventional antiglare film having an antiglare layer composed of a hard coat layer containing a matting agent as particles is used on the screen of a display element, the particles in the hard coat layer are mainly formed. In other words, a so-called sparkle (glaring phenomenon) in which the RGB emission points are enlarged and emphasized by the lens action of the plurality of convex portions is generated on the surface of the hard coat layer. This caused a problem that a high-definition color screen looked glaring.

  Moreover, as a surface member arrange | positioned on the screen of various display elements, there exist a touch panel other than the anti-glare film mentioned above. In these surface members, interference fringes (Newton rings) may occur due to partial narrowing of the distance between the surface member and the display element and the distance between the members constituting the surface member. For this reason, the material which comprises a surface member is provided with the uneven | corrugated layer (Newton ring prevention layer) containing a mat agent. This technique forms a plurality of protrusions formed mainly by matting agent particles in the uneven layer. As a result, even when a part of the surface member is bent, the interval between the uneven layer and the various display elements is maintained at a certain level or more by the plurality of convex portions, thereby preventing Newton's ring. However, even in the Newton ring prevention layer, the same problem as the above-described antiglare layer (occurrence of sparkle) has occurred.

  As described above, a matting agent is necessary for developing antiglare properties and Newton ring preventing properties. However, sparkle is generated by a lens formed around the matting agent, and antiglare properties or Newtonian properties are generated. It was difficult to satisfy both the ring prevention property and the sparkle prevention property at the same time.

  In addition, a technique for adding a resin component other than the ionizing radiation curable resin to the Newton ring prevention layer (Patent Document 1), a technique for increasing the coefficient of variation of the particle size distribution of the matting agent in the Newton ring prevention layer (Patent Document) 2) has been proposed, but there is a need for a technique capable of further preventing the occurrence of sparkle for color display elements that have been further refined in recent years. From the viewpoint of preventing scratches, it is desirable that the coating film hardness is as high as possible.

JP 2005-265863 A JP 2005-265864 A

  In one aspect of the present invention, there is provided a technique capable of simultaneously satisfying both properties of antiglare property, Newton's ring prevention property and sparkle prevention property, and capable of increasing coating film hardness.

  When the present inventors include a specific resin component (one or more of a thermoplastic resin and a thermosetting resin into which a reactive functional group is introduced) in a composition containing a matting agent and an ionizing radiation curable resin, In the process of curing the composition, the flow of the ionizing radiation curable resin is further suppressed. As a result, it was found that the occurrence of undulation of the resin after curing was further suppressed, and thereby it was possible to prevent the occurrence of sparkle more effectively, and the coating film hardness could be increased, thereby completing the present invention. It was.

The hard coat film of this invention can be utilized for the use arrange | positioned in the front surface of a display element.
The hard coat film which concerns on the 1st viewpoint of this invention is comprised with the hardened | cured material of the curable composition containing the matting agent and the ionizing radiation curable resin as a resin part, and the convex part resulting from the said matting agent Having a plurality of optical functional layers on the surface,
The curable composition further includes one or more of the following (a) and (b) as a resin component:
Content ratio in total resin content is ionizing radiation curable resin: 50% by weight or more and less than 85% by weight, and the following (a) and (b): more than 15% by weight and 50% by weight or less .

The hard coat film which concerns on the 2nd viewpoint of this invention is comprised by the hardened | cured material of the curable composition containing the matting agent and the ionizing radiation curable resin as a resin part, and the convex part resulting from the said matting agent Having a plurality of optical functional layers on the surface,
The curable composition further includes one or more of the following (a) and (b) as a resin component:
The aspect ratio of the convex part is adjusted to 0.043 or more.

The display element with a surface member according to the first aspect of the present invention is characterized in that the surface member is disposed on the display element, and the surface member includes the hard coat film of the present invention in at least a part thereof. .
In the display element with a surface member according to the second aspect of the present invention, the surface member is arranged on the display element, and the surface member is used as an optical functional layer as at least one of an antiglare layer and a Newton ring prevention layer. It is characterized by comprising the hard coat film of the present invention.

The curable composition of the present invention is used to form an optical functional layer that exhibits at least one optical function of an antiglare effect and suppression of occurrence of interference fringes,
Contains resin and matting agent
The resin component includes an ionizing radiation curable resin and one or more of the following (a) and (b):
Content ratio in total resin content is ionizing radiation curable resin: 50% by weight or more and less than 85% by weight, and the following (a) and (b): more than 15% by weight and 50% by weight or less .

(A) a compound having a reactive functional group introduced into a thermoplastic resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more;
(B) A compound having a reactive functional group introduced into a thermosetting resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more.
The reactive functional group introduced into the compound is preferably a photocurable unsaturated group.

The present invention includes the following aspects.
(1) In the hard coat film and the curable composition, the matting agent can be constituted with an average particle diameter of 0.1 to 10 μm. The matting agent may be composed of a single matting agent having a predetermined average particle diameter, but it is preferable to use a combination of a plurality of matting agents having different average particle diameters. In this case, at least a first matting agent having an average particle size of 0.1 to 4.0 μm and a second matting agent having an average particle size of 3.0 to 10.0 μm can be included. The matting agent can be used in combination of only the first matting agent and the second matting agent. In this case, those having a variation coefficient of the particle size distribution of 15% or less can be used. The weight ratio of the first matting agent to the second matting agent in all matting agents to be contained is 8: 2 to 6: 4, regardless of whether or not the third and subsequent matting agents are contained. be able to. Regardless of whether the use of the matting agent is single or plural, the matting agent as a whole can be contained in the range of 0.05 to 5 parts by weight with respect to 100 parts by weight of the resin.

(2) In the hard coat film and the curable composition, the optical functional layer can be used as an antiglare layer that exhibits an antiglare effect or a Newton ring prevention layer that suppresses the generation of interference fringes.
(3) In the hard coat film and the curable composition, a (meth) acryloyl group can be used as a reactive functional group of at least one of the thermoplastic resin (a) and the thermosetting resin (b). .

(4) A hard coat film can be utilized for the use arrange | positioned in the front surface of a display element.
In the hard coat film according to the first aspect, the aspect ratio of the plurality of convex portions arranged on the surface of the optical functional layer due to the matting agent is preferably adjusted to 0.043 or more.
(5) In the display element with a surface member according to the first aspect, the hard coat film of the present invention using the optical functional layer as an antiglare layer can be included on the surface side of the surface member. Moreover, the hard coat film of this invention which utilized the optical function layer as a Newton ring prevention layer can be included in the back surface side of a surface member. Moreover, a surface member can be comprised with a protective plate, a touch panel, or a polarizing film.

(6) In the display element with a surface member according to the second aspect, the surface member can be formed of a protective plate, a touch panel, or a polarizing film.
(7) In the display element with a surface member of the present invention, the surface member is arranged on the display element, the surface member is a touch panel, and the outermost surface member of the touch panel uses the optical functional layer as an antiglare layer. It can be comprised with the hard coat film of invention.

(8) In the display element with a surface member of the present invention, the surface member is disposed on the display element, the surface member is a touch panel, and at least one of the outermost surface member, the intermediate member, and the rearmost member of the touch panel, It can be comprised with the hard coat film of this invention using the optical function layer as a Newton ring prevention layer.

According to the present invention, the composition containing the matting agent and the ionizing radiation curable resin that forms the optical functional layer contains a specific resin component (one or more of Compound A1 and Compound A2 described below). Further, the occurrence of undulation of the resin after curing is further suppressed. As a result, the resulting coating film can satisfy both the antiglare property, the Newton ring prevention property, and the sparkle prevention property at the same time.
In addition, since the reactive functional group is introduced into the specific resin component, the bond with the ionizing radiation curable resin is strengthened. As a result, the coating film hardness can be further increased as compared with the case where the reactive functional group is not introduced.

That is, when the curable composition of the present invention is used, a coating film (optical functional layer) having both the antiglare property, the Newton ring prevention property and the sparkle prevention property at the same time and having an enhanced coating film hardness is obtained. be able to.
Since the hard coat film and the display element with a surface member of the present invention have an optical functional layer composed of a cured product of the curable composition of the present invention, both antiglare and Newton ring preventive properties and sparkle preventive properties are provided. Is satisfied at the same time, and the coating film hardness is increased.

FIG. 1 is a cross-sectional view showing a display element front film as an example of the present invention. FIG. 2 is a cross-sectional view showing an example of a conventional display element front film. FIG. 3 is a cross-sectional view showing an example of the display element with a surface member of the present invention. FIG. 4 is a sectional view showing another example of the display element with a surface member of the present invention. FIG. 5 is a cross-sectional view showing another example of the display element with a surface member of the present invention. FIG. 6 is a cross-sectional view showing another example of the display element with a surface member of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Display element front film (hard coat film), 11 ... Transparent base material, 12 ... Optical functional layer, 121 ... Resin component (binder), 122 ... Matting agent, 2 ... Surface member, 2a ... Protection plate, 2b ... Touch panel, 2c ... polarizing plate, 3 ... display element, 4, 4a, 4b, 4c ... display element with surface member.

Below, the case where the hard coat film of this invention is used as a film for display element front surfaces arrange | positioned in the front surface of a display element is illustrated and demonstrated.
As shown in FIG. 1, in the display element front film 1 of this example, an optical functional layer 12 is laminated on a transparent substrate 11.

  Examples of the transparent substrate 11 include a transparent film formed of a material such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triacetyl cellulose, and acrylic. Among these, a polyethylene terephthalate film that has been stretched, in particular biaxially stretched, is preferred because of its excellent mechanical strength and dimensional stability. Moreover, what improved the adhesiveness with the optical function layer 12 by giving a corona discharge process to the surface of the transparent base material 11, or providing an easily bonding layer is used suitably. The thickness of the transparent substrate 11 is generally 6 to 500 μm, preferably 23 to 200 μm.

  Examples of the optical functional layer 12 include an antiglare layer that exhibits an antiglare effect and a Newton ring prevention layer that suppresses the occurrence of interference fringes (Newton rings). The optical functional layer 12 includes a resin component 121 and a matting agent 122, and is composed of a cured product of a curable composition (curable resin precursor), and includes a plurality of convex portions due to the matting agent 122 on the surface. Become.

  The curable composition of this example includes a resin component and a matting agent. Note that the resin component referred to in this example includes a curable resin and a thermoplastic resin. In addition, the cured product in this example refers to curing of a polymerization initiator, a polymerization accelerator (such as an ultraviolet sensitizer), and a curing agent necessary for curing the curable resin together with a curable resin as a curing main agent. It is used in the concept including auxiliary agents.

  The resin component of this example includes at least an ionizing radiation curable resin. As the ionizing radiation curable resin, those that are cross-linked and cured by irradiation with ionizing radiation (ultraviolet rays or electron beams) are used. As such, it is possible to use one or a mixture of two or more of a photocationic polymerizable resin capable of photocationic polymerization, a photopolymerizable prepolymer capable of photoradical polymerization, or a photopolymerizable monomer. it can.

  Examples of the cationic photopolymerizable resin include epoxy resins such as bisphenol epoxy resins, novolac epoxy resins, alicyclic epoxy resins, and aliphatic epoxy resins, and vinyl ether resins.

  As the photopolymerizable prepolymer, an acrylic prepolymer having two or more acryloyl groups in one molecule and forming a three-dimensional network structure by crosslinking and curing is particularly preferably used. As the acrylic prepolymer, urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate, polyfluoroalkyl acrylate, silicone acrylate and the like can be used. Furthermore, these acrylic prepolymers can be used alone, but it is preferable to add a photopolymerizable monomer in order to improve the cross-linking curability and further improve the hardness of the functional layer.

  As photopolymerizable monomers, monofunctional acrylic monomers such as 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, butoxyethyl acrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol One kind of bifunctional acrylic monomer such as diacrylate, polyethylene glycol diacrylate, hydroxypivalate ester neopentyl glycol diacrylate, etc., or polyfunctional acrylic monomer such as dipentaerythritol hexaacrylate, trimethylpropane triacrylate, pentaerythritol triacrylate or the like Two or more are used.

In addition to the above-mentioned photocationic polymerizable resin, photopolymerizable prepolymer or photopolymerizable monomer, the ionizing radiation curable resin is a curing aid such as a photopolymerization initiator or an ultraviolet sensitizer when cured by ultraviolet irradiation. It is preferable to contain an agent.
Photopolymerization initiators include photo radical polymerization initiators such as acetophenones, benzophenones, Michler's ketone, benzoin, benzylmethyl ketal, benzoylbenzoate, α-acyloxime esters, thioxanthones, onium salts, sulfonate esters, organometallics Examples include photocationic polymerization initiators such as complexes. Examples of the ultraviolet sensitizer include n-butylamine, triethylamine, and tri-n-butylphosphine.

  Further, the photopolymerization accelerator can reduce the polymerization obstacle due to air at the time of curing and increase the curing speed. For example, p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, and the like. Can be mentioned.

  Further, an ionizing radiation curable organic-inorganic hybrid resin may be used as the ionizing radiation curable resin. Unlike traditional composites typified by glass fiber reinforced plastic (FRP), ionizing radiation curable organic-inorganic hybrid resins (hereinafter sometimes simply referred to as “organic-inorganic hybrid resins”) are organic and inorganic. The mixture is intimately mixed, and the dispersion state is at or close to the molecular level. By irradiation with ionizing radiation, the inorganic component and the organic component react to form a film.

  Examples of the inorganic component in the organic-inorganic hybrid resin include metal oxides such as silica and titania, and silica is preferable. Examples of the silica include reactive silica in which a photosensitive group having photopolymerization reactivity is introduced on the surface. The content of the inorganic component in the organic-inorganic hybrid resin is preferably 10% by weight or more, more preferably 20% by weight, preferably 65% by weight or less, more preferably 40% by weight or less.

  The organic component in the organic-inorganic hybrid resin is a compound having a polymerizable unsaturated group polymerizable with the inorganic component (preferably reactive silica) (for example, having two or more polymerizable unsaturated groups in the molecule). And polyunsaturated organic compounds or unit price unsaturated organic compounds having one polymerizable unsaturated group in the molecule).

  In this example, one or more specific compounds A1 and A2 are contained in the curable composition together with the ionizing radiation curable resin described above.

  The ionizing radiation curable resin has a property of curing while flowing in the course of curing. Therefore, when trying to obtain a cured product using a curable composition containing a matting agent and an ionizing radiation curable resin, the ionizing radiation curable resin flows during curing of the curable composition, As shown in FIG. 2, “swell 121 a ′” of the resin portion 121 a centering on the matting agent 122 a is generated and a lens shape is formed. Due to this, sparkle is generated in the conventional film 1a having the optical function layer 12a including the matting agent 122a and the resin component 121a.

  In this example, together with the ionizing radiation curable resin, a specific amount of one or more of compound A1 and compound A2 is included, thereby further suppressing the flow of the ionizing radiation curable resin during the curing process. As shown in FIG. 1, the occurrence of “swell” of the resin portion 121 after curing is further suppressed (what substantially corresponds to the swell 121 a ′ in FIG. 2 is not seen. The same applies hereinafter). Thus, the occurrence of sparkles in the optical functional layer 12 after curing can be more effectively prevented. At the same time, by introducing a reactive functional group into Compound A1 and Compound A2 to be blended, the bond with the ionizing radiation curable resin is strengthened, and as a result, those having no reactive functional group introduced thereinto. Compared with the case where it mix | blends, coating-film hardness can be raised more.

Compound A1 is obtained by introducing a reactive functional group into a thermoplastic resin. Compound A2 is obtained by introducing a reactive functional group into a thermosetting resin.
Examples of thermoplastic resins include polyester resins, acrylic resins, polycarbonate resins, cellulose resins, acetal resins, vinyl resins, polyethylene resins, polystyrene resins, polypropylene resins, polyamide resins, and polyimide resins. Examples thereof include resins and fluorine resins.
Examples of the thermosetting resin include polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, epoxy resins, melamine resins, phenol resins, and silicone resins.
When a thermoplastic resin and a thermosetting resin are compared, a thermoplastic resin is preferable in that the surface shape can be easily adjusted and the handleability is excellent.

  As the reactive functional group introduced into the thermoplastic resin or thermosetting resin, a photocurable unsaturated group is preferably used, and an ionizing radiation curable unsaturated group is preferable. Specific examples thereof include an ethylenically unsaturated bond such as a (meth) acryloyl group, a styryl group, a vinyl group and an allyl group, and an epoxy group. More preferred is a (meth) acryloyl group.

In this example, a compound having a glass transition temperature (Tg) of 45 ° C. or higher, preferably 80 ° C. or higher, more preferably 90 ° C. or higher is used as compound A1 and / or compound A2. By using the compound A1 and / or the compound A2 having a Tg of 45 ° C. or more together with the ionizing radiation curable resin, it is possible to easily suppress the flow of the ionizing radiation curable resin during the curing process.
In addition, Tg of compound A2 in this example is that before curing.

  In this example, as compound A1 and / or compound A2, those having a weight average molecular weight (Mw) of 70,000 or more, preferably 80,000 or more are used. By using the compound A1 and / or the compound A2 having an Mw of 70,000 or more together with the ionizing radiation curable resin, the flow of the ionizing radiation curable resin can be easily suppressed during the curing process.

That is, in this example, one or more of the following (a) and (b) are included together with the ionizing radiation curable resin.
(A) a compound A1 having a photocurable unsaturated group introduced as a reactive functional group in a thermoplastic resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more;
(B) Compound A2 having a photocurable unsaturated group introduced as a reactive functional group in a thermosetting resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more.

  In addition, the value of the weight average molecular weight (Mw) is obtained by measuring the molecular weight distribution of the compound by a gel permeation chromatograph (GPC) equipped with a differential refractive index detector (RID), for example. Chart) can be calculated using standard polystyrene as a calibration curve.

  In this example, the weight ratio between the ionizing radiation curable resin and the compound A1 and / or the compound A2 is preferably 50% by weight to less than 85% by weight of the former, more than 15% by weight and 50% by weight or less of the latter. More preferably, the former is 60% to 80% by weight, the latter is 20% to 40% by weight, more preferably the former is 60% to 75% by weight, and the latter is 25% to 40% by weight. And By setting the compound A1 and / or the compound A2 to an amount exceeding 15% by weight, the occurrence of swell can be sufficiently suppressed and sparkle can be easily prevented. By making compound A1 and / or compound A2 50 weight% or less, it can be made easy to prevent the coating-film intensity fall by containing compound A1 and / or compound A2 more than necessary.

  By blending compound A1 and / or compound A2 in the total resin content in the range of more than 15% by weight and 50% by weight or less, the dispersibility of the matting agent is improved, thereby appropriately adjusting the surface properties of the coating film. Is done. For example, the aspect ratio of the convex portion due to the matting agent formed on the coating film surface is adjusted to a range of 0.043 or more. When the aspect ratio of the convex part is out of this range, the effect of preventing sparkle due to suppression of the occurrence of waviness while maintaining the coating film strength cannot be obtained.

  In this example, the “aspect ratio of the convex portion” is preferably 0.2 or less, more preferably 0.18 or less, and still more preferably 0.8 or less, from the viewpoint of preventing the matting agent from falling off the coating film surface. 16 or less.

  In this example, the “aspect ratio of the convex portion” means the ratio (H / L) of the height H of the convex portion to the base length L (both refer to FIG. 2). Here, the “convex portion” means a portion where the matting agent 122 protrudes on the surface of the coating film (optical functional layer 12a), and the height (height of the projecting portion) H is a coating where the matting agent 122 does not exist. It means the shortest distance (μm) between the tangent line drawn on the smooth part of the film and the tangent line drawn on the upper end part of the convex part. “Span” means the bottom surface of a circular area with a gradient of 0.1 μm in height, which is a portion of the coating film that touches the periphery of the convex portion when viewed in plan, and its length (base length) L means the diameter (μm) of the bottom surface of the circular region.

  In this example, the height H of the convex portion is preferably 0.3 μm or more, more preferably 0.4 μm or more in consideration of Newton ring prevention. On the other hand, from the viewpoint of preventing the matting agent from dropping on the coating film surface, the thickness is preferably 8 μm or less, more preferably 6 μm or less.

  In this example, the skirt length L is preferably 80 μm or less, more preferably 60 μm or less, still more preferably 40 μm or less, and most preferably 37 μm or less in consideration of sparkle prevention. On the other hand, from the viewpoint of achieving both Newton ring prevention properties and sparkle prevention properties, the thickness is preferably 3 μm or more, more preferably 4 μm or more.

  In this example, the height H and skirt length L of the convex portion can be obtained from the cross-sectional shape of the coating film photographed using, for example, a confocal laser microscope (VK-9710, manufactured by Keyence Corporation). Moreover, it can also obtain | require from the three-dimensional information of the surface shape of a coating film measured using various apparatuses, such as a confocal microscope, an interference microscope, and an atomic force microscope (AFM).

  Matting agents include inorganic particles (eg, calcium carbonate, magnesium carbonate, barium sulfate, aluminum hydroxide, silica, kaolin, clay, talc, etc.) and resin particles (eg, acrylic resin particles, polystyrene resin particles, polyurethane resin particles). Polyethylene resin particles, benzoguanamine resin particles, epoxy resin particles, etc.). Among these, spherical fine particles are preferable from the viewpoint of handleability and ease of control of the surface shape. Moreover, the resin particles are suitable in that they easily bring the difference in refractive index from that of the resin, easily prevent the occurrence of sparkle, and are difficult to hinder transparency.

  Although the average particle diameter of the matting agent varies depending on the thickness of the optical functional layer 12, it cannot be generally stated, but is preferably 0.1 μm or more, more preferably 1 μm or more, preferably 10 μm or less, more preferably 8 μm or less. And By making the average particle size of the matting agent 10 μm or less, induction of sparkle can be easily prevented, and by making the average particle size 0.1 μm or more, antiglare property and Newton ring prevention property can be easily developed.

  The matting agent of this example is preferably composed of a combination of a plurality of matting agents having different average particle diameters. In the case of this example, the average particle size is preferably 0.1 μm or more, more preferably 0.5 μm or more, further preferably 2.5 μm or more, preferably 4.0 μm or less, more preferably 3.5 μm or less. The average particle diameter of the first matting agent is preferably 3.0 μm or more, more preferably 4.0 μm or more, preferably 10.0 μm or less, more preferably 7.0 μm or less, and even more preferably 6 It is more preferable to include at least a second matting agent of 0.0 μm or less. By using a combination of a plurality of matting agents having different average particle diameters, it is easy to suppress the occurrence of sparkles.

  As a matting agent of this example, when only two types (the first matting agent and the second matting agent) described above are used in combination (not containing the third and subsequent matting agents other than these two types), In addition, it is preferable to use particles having a variation coefficient of particle size distribution of 15% or less, preferably 10% or less (so-called monodisperse particles). When only the first matting agent and the second matting agent described above are used in combination, a particle having a particle diameter distribution coefficient of variation of 15% or less is used, causing a large local convex portion. Easy to prevent sparkle.

  The coefficient of variation (CV value: coefficient of variation) is a value indicating the dispersion state of the particle size distribution, and the standard deviation of the particle size distribution (the square root of unbiased dispersion) is the arithmetic average value of the particle size (average particle size) It is the percentage of the value divided by (diameter). That is, it shows how much the spread of particle size distribution (variation of particle size) is relative to the average value (arithmetic average diameter). Usually, CV value (no unit) = (standard deviation / average) Value). The smaller the CV value, the narrower the particle size distribution (sharp), and the larger the CV value, the wider the particle size distribution (broad).

The content of the matting agent is preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, preferably 5 parts by weight or less, more preferably 3 parts by weight with respect to 100 parts by weight of the resin content. Part or less, more preferably 1 part by weight or less. By making the content with respect to 100 parts by weight of the resin 5 parts by weight or less, induction of sparkle can be easily prevented, and by making the content 0.05 parts by weight or more, antiglare property and Newton ring prevention property are expressed. Easy to do.
In addition, as a mat agent of this example, these two types (first mat) are also included, including the case where a third or subsequent mat agent other than the above-described two types (first mat agent, second mat agent) is contained. When the combination of the first and second matting agents is used, the weight ratio of the first matting agent to the second matting agent in all matting agents is preferably 8: 2 to 6: 4.

The “average particle size” and “coefficient of variation in particle size distribution” of the matting agent in this example are values measured by a Coulter counter method.
The Coulter counter method is a method of electrically measuring the number and size of matting agent particles dispersed in a solution, in which particles are dispersed in an electrolyte and electricity flows using suction force. This is a method of measuring a voltage pulse proportional to the volume of a particle by replacing the electrolyte by the volume of the particle when passing the particle through the pores, increasing the resistance. Therefore, by measuring the height and number of the voltage pulses electrically, the number of particles and the individual particle volume are measured, and the particle size and particle size distribution are obtained.

  You may add additives, such as a leveling agent, a ultraviolet absorber, and antioxidant, in a curable composition.

  The optical functional layer 12 can be formed by curing the above-described curable composition of the present example by coating, drying, and irradiating with ionizing radiation on the transparent substrate 11.

From the viewpoint of preventing damage, the optical functional layer 12 has a surface hardness that does not cause damage even when steel wool # 0000 with a load of 200 g / 2 cm ² is reciprocated five times (preferably 10 times) or more. In particular, in this example, since the reactive functional group is introduced into the thermoplastic resin and the thermosetting resin blended with the ionizing radiation curable resin, the number of reciprocations by the steel wool # 0000 on the surface of the optical functional layer 12 is 10 times. It can be more than once.
The thickness of the optical function layer 12 is preferably 0.5 μm or more, more preferably 1 μm or more, preferably 10 μm or less, more preferably 5 μm or less, and particularly preferably 3 μm or less.

  In order to prevent sparkle, the display element front film 1 of this example has a total light transmittance (JIS K7361-1: 1997) of 85% or more and a haze (JIS K7136: 2000) of 10% or less. preferable.

  The usage application of the hard coat film of the present invention is not limited to the above-described front surface of the display element. For example, it can be used for other applications such as a transparent electrode film, an anti-scattering film (for example, a configuration in which an adhesive layer is provided on the surface opposite to the optical functional layer 12 of the transparent base material 11), and a printing film.

As shown in FIGS. 3 to 6, the display element 4 (4 a, 4 b, 4 c) with the surface member of this example is configured by disposing the surface member 2 (2 a, 2 b, 2 c) on the display element 3. ing.
Examples of the display element 3 include a liquid crystal display element, a CRT display element, a plasma display element, and an EL display element. Examples of the surface member 2 include a protective plate 2a, a touch panel 2b, and a polarizing plate 2c. In this example, the display element front film 1 of this example is included in at least a part of these surface members 2 (2a, 2b, 2c).

  The protective plate 2a as an example can be constituted by a transparent resin plate represented by an acrylic resin plate, for example. The thickness of the protective plate 2a is usually about 0.1 to 2.0 mm.

  The method of the touch panel 2b as an example is not specifically limited, For example, it can comprise with a resistive touch panel, a capacitive touch panel, etc.

  For example, when the surface member 2 is the protective plate 2a, as shown in FIG. 3, the display element-attached film 1 is laminated on the surface side of the protective plate 2a as a glare-proof film. The element 4a may be configured. As shown in FIG. 4, the display element 4a with a surface member can also be configured by laminating the display element front film 1 of this example as a Newton ring prevention film on the back side of the protective plate 2a. As shown in FIG. 5, the display element front film 1 itself of this example may be provided on the display element 3 as a protective plate 2 a having antiglare properties and / or Newton ring preventing properties.

  Moreover, when the surface member 2 is the touch panel 2b, as shown in FIG. 3, the display element 4b with a surface member is laminated | stacked on the surface side of the touch panel 2b by laminating | stacking the film 1 for display element front surfaces of this example as an anti-glare film. May be configured. As shown in FIG. 4, the display element-attached display element 4b can be configured by laminating the display element front film 1 of this example as a Newton ring prevention film on the back side of the touch panel 2b. As shown in FIG. 6, you may comprise the display element 4b with a surface member by using the film 1 for display element front surfaces of this example as an anti-glare film as a member of the outermost surface of the touch panel 2b. Although not shown in the drawing, the display element-attached display element 4b can be configured by using the display element front film 1 itself of this example as a Newton ring prevention film as a member on the outermost surface, middle, or rearmost surface of the touch panel 2b. .

  Moreover, when the surface member 2 is the polarizing film 2c, as shown in FIG. 3, a display with a surface member is provided by bonding the film 1 for a display element front surface of this example as an antiglare film on the surface side of the polarizing film 2c. The element 4c can be configured.

  Since the display element 4 (4a, 4b, 4c) of the surface member of this example having the above-described configuration includes the optical functional layer 12 with a cured product of the curable composition of this example, the predetermined function (prevention) Sparkling can be prevented and coating film hardness is increased while providing dazzling properties, Newton's ring prevention properties, and the like.

Hereinafter, the present invention will be described in more detail with examples that further embody the embodiment of the present invention. In this example, “parts” and “%” are based on weight unless otherwise specified.
In this example, resins A to E and matting agents A to E were as follows.

[Resin A] Thermosetting acrylic resin obtained in Synthesis Example 1 below (solid content 40%, glass transition temperature: 86 ° C., weight average molecular weight: 80,000, reactive functional group: acryloyl group),
[Resin B] Thermosetting acrylic resin obtained in Synthesis Example 2 below (solid content 45%, glass transition temperature: 77 ° C., weight average molecular weight: 80,000, reactive functional group: acryloyl group),
[Resin C] Thermosetting acrylic resin obtained in Synthesis Example 3 below (solid content 40%, glass transition temperature: 86 ° C., weight average molecular weight: 100,000, reactive functional group: acryloyl group),
[Resin D] Thermoplastic acrylic resin (Acridic 49-394-IM: DIC, solid content 50%, glass transition temperature: 16 ° C., weight average molecular weight: 65,000, reactive functional group: none),
[Resin E] Thermoplastic acrylic resin (Acridic A195: DIC, solid content 40%, glass transition temperature: 94 ° C., weight average molecular weight: 85,000, reactive functional group: none).

[Synthesis Example 1]
In the reaction vessel, 150 parts by weight of methyl isobutyl ketone (MIBK) was supplied as a solvent and heated to 90 ° C. and maintained. A mixture of 61 parts by weight of methyl methacrylate (MMA) and 26 parts by weight of glycidyl methacrylate (GMA) with 1.5 parts by weight of azobis-2-methylbutyronitrile (ABN-E) as a radical polymerization initiator was mixed for 2 hours. The solution was gradually dropped into the reaction vessel over a period of 4 hours and then left for 4 hours. Thereafter, the monomer composition was heated at 120 ° C. for 1 hour to obtain a polymer.
Next, after the polymer was cooled to 60 ° C., 13 parts by weight of acrylic acid (AA), 0.05 parts by weight of paramethoxyphenol (MQ) as a polymerization inhibitor, and triphenylphosphine (TPP) as a catalyst 0.5 part by weight was mixed to obtain a mixture. Thereafter, the mixture is heated at 110 ° C. for 8 hours to add acrylic acid (AA) to the polymer, whereby compound A2 in which a reactive functional group (acryloyl group) is introduced into the thermosetting resin is added. The corresponding resin A (non-volatile content 40%, glass transition point 86 ° C., weight average molecular weight 80,000) was produced.

[Synthesis Example 2]
In the reaction vessel, 122 parts by weight of methyl isobutyl ketone (MIBK) was supplied as a solvent and heated to 90 ° C. and maintained. A mixture of 40 parts by weight of methyl methacrylate (MMA) and 40 parts by weight of glycidyl methacrylate (GMA) with 1.5 parts by weight of azobis-2-methylbutyronitrile (ABN-E) as a radical polymerization initiator for 2 hours The solution was gradually dropped into the reaction vessel over a period of 4 hours and then left for 4 hours. Thereafter, the monomer composition was heated at 120 ° C. for 1 hour to obtain a polymer.
Next, after cooling the polymer to 60 ° C., 20 parts by weight of acrylic acid (AA), 0.05 parts by weight of paramethoxyphenol (MQ) as a polymerization inhibitor, and triphenylphosphine (TPP) as a catalyst 0.5 part by weight was mixed to obtain a mixture. Thereafter, the mixture is heated at 110 ° C. for 8 hours to add acrylic acid (AA) to the polymer, whereby compound A2 in which a reactive functional group (acryloyl group) is introduced into the thermosetting resin is added. The corresponding resin B (non-volatile content 45%, glass transition point 60 ° C., weight average molecular weight 80,000) was produced.

[Synthesis Example 3]
In the reaction vessel, 150 parts by weight of methyl isobutyl ketone (MIBK) was supplied as a solvent and heated to 90 ° C. and maintained. A mixture of 61 parts by weight of methyl methacrylate (MMA) and 26 parts by weight of glycidyl methacrylate (GMA) and 1.0 part by weight of azobis-2-methylbutyronitrile (ABN-E) as a radical polymerization initiator was mixed for 2 hours. The solution was gradually dropped into the reaction vessel over a period of 4 hours and then left for 4 hours. Thereafter, the monomer composition was heated at 120 ° C. for 1 hour to obtain a polymer.
Next, after the polymer was cooled to 60 ° C., 13 parts by weight of acrylic acid (AA), 0.05 parts by weight of paramethoxyphenol (MQ) as a polymerization inhibitor, and triphenylphosphine (TPP) as a catalyst 0.5 part by weight was mixed to obtain a mixture. Thereafter, the mixture is heated at 110 ° C. for 8 hours to add acrylic acid (AA) to the polymer, whereby compound A2 in which a reactive functional group (acryloyl group) is introduced into the thermosetting resin is added. Corresponding resin C (non-volatile content 40%, glass transition point 86 ° C., weight average molecular weight 100,000) was produced.

[Matting agent A] Acrylic resin particles (MX-500: Soken Chemical Industry Co., Ltd., average particle size 5 μm, coefficient of variation 9%)
[Matting agent B] Acrylic resin particles (Techpolymer SSX-105: Sekisui Plastics Co., Ltd., average particle size 5.3 μm, coefficient of variation 8.5%)
[Matting agent C] Acrylic resin particles (Techpolymer MB20X-5: Sekisui Plastics Co., Ltd., average particle size: 5 μm, coefficient of variation: about 20%).
[Matting agent D] Acrylic resin particles (MX-300: Soken Chemical Industry Co., Ltd., average particle size 3 μm, coefficient of variation 9%)
[Matting agent E] Acrylic resin particles (MX-180TA: Soken Chemical Industry Co., Ltd., average particle size 1.8 μm, coefficient of variation 9%).

[Example 1]
On one side of a 125 μm thick transparent polyester film (Cosmo Shine A4350: Toyobo Co., Ltd.), a coating liquid a having the following formulation was applied, dried and irradiated with ultraviolet rays to form an optical functional layer having a thickness of 3 μm. A hard coat film was obtained. In addition, the weight conversion amount of solid content is shown in parentheses.

<Coating liquid a>
・ Ionizing radiation curable resin (solid content 80%) 125 parts (100 parts)
(Unidic 17-813: DIC Corporation),
Resin A 107 parts (42.8 parts)
・ Photopolymerization initiator 3 parts (Irgacure 184: Ciba Japan)
-Matting agent A 0.7 part-Diluting solvent 200 parts

[Example 2]
A hard coat film of this example was obtained in the same manner as in Example 1 except that the addition amount of the resin A in the coating liquid a was changed to 65 parts (solid content 26 parts).

[Example 3]
A hard coat film of this example was obtained in the same manner as in Example 1 except that the addition amount of the resin A in the coating liquid a was changed to 250 parts (solid content: 100 parts).

[Example 4]
A hard coat film of this example was obtained in the same manner as in Example 1 except that the resin A of the coating liquid a was changed to the resin B and the addition amount was changed to 95 parts (solid content 42.75 parts). .

[Example 5]
A hard coat film of this example was obtained in the same manner as in Example 1 except that the matting agent A of the coating liquid a was changed to the matting agent B.

[Example 6]
A hard coat film of this example was obtained in the same manner as in Example 1 except that the resin A of the coating liquid a was changed to the resin C.

[Example 7]
A hard coat film of this example was obtained in the same manner as in Example 1 except that the matting agent A of the coating liquid a was changed to the matting agent C.

[Example 8]
The amount of resin A added to coating solution a was changed to 97.2 parts (solid content 38.9 parts). Further, a hard coat film of this example was obtained in the same manner as in Example 1 except that the matting agent A of the coating liquid a was changed to the matting agent E and the addition amount thereof was changed to 0.14 part.

[Example 9]
The addition amount of the resin A in the coating solution a was changed to 250 parts (solid content 100 parts), and the addition amount of the ionizing radiation curable resin was changed to 48.75 parts (solid content 39 parts). Further, a hard coat film of this example was obtained in the same manner as in Example 1 except that the matting agent A of the coating liquid a was changed to the matting agent E and the addition amount thereof was changed to 0.14 part.

[Example 10]
The addition amount of the resin A in the coating liquid a was changed to 47.6 parts (solid content 19.0 parts), and the addition amount of the ionizing radiation curable resin was changed to 256 parts (solid content 204.75 parts). Further, a hard coat film of this example was obtained in the same manner as in Example 1 except that the matting agent A of the coating liquid a was changed to the matting agent D and the addition amount thereof was changed to 0.14 part.

[Example 11]
The amount of resin A added to coating solution a was changed to 97.2 parts (solid content 38.9 parts). Further, a hard coat film of this example was obtained in the same manner as in Example 1 except that the matting agent A of the coating liquid a was changed to the matting agent D and the addition amount thereof was changed to 0.14 part.

[Example 12]
The addition amount of the resin A in the coating liquid a was changed to 196.4 parts (solid content 78.6 parts), and the addition amount of the ionizing radiation curable resin was changed to 62 parts (solid content 50 parts). Further, a hard coat film of this example was obtained in the same manner as in Example 1 except that the matting agent A of the coating liquid a was changed to the matting agent D and the addition amount thereof was changed to 0.14 part.

[Example 13]
The addition amount of the resin A in the coating solution a was changed to 250 parts (solid content 100 parts), and the addition amount of the ionizing radiation curable resin was changed to 48.75 parts (solid content 39 parts). Further, a hard coat film of this example was obtained in the same manner as in Example 1 except that the matting agent A of the coating liquid a was changed to the matting agent D and the addition amount thereof was changed to 0.14 part.

[Example 14]
Example 1 was repeated except that the amount of resin A added to coating solution a was changed to 97.2 parts (solid content 38.9 parts) and the amount of matting agent A was changed to 0.14 parts. Thus, a hard coat film of this example was obtained.

[Example 15]
The addition amount of the resin A in the coating solution a was changed to 250 parts (solid content 100 parts), and the addition amount of the ionizing radiation curable resin was changed to 48.75 parts (solid content 39 parts). Further, a hard coat film of this example was obtained in the same manner as in Example 1 except that the addition amount of the matting agent A in the coating liquid a was changed to 0.14 part.

[Example 16]
A part (0.07 part) of the matting agent D (average particle size 3 μm, variation coefficient 9%) of the coating liquid a was replaced with the matting agent E (average particle size 1.8 μm, variation coefficient 9%). That is, except that the matting agent D (addition amount is 0.14 part) of the coating liquid a is changed to two kinds of matting agent D and matting agent E (addition amount is 0.07 part each) having different average particle diameters. Produced the hard coat film of this example in the same manner as in Example 11 (resin A content: 28%).

[Example 17]
A part (0.07 part) of the matting agent D (average particle diameter 3 μm, variation coefficient 9%) of the coating liquid a was replaced with the matting agent A (average particle diameter 5 μm, variation coefficient 9%). That is, except that the matting agent D (addition amount is 0.14 part) of the coating liquid a is changed to two types of matting agent A and matting agent D (addition amount is 0.07 part each) having different average particle diameters. Produced the hard coat film of this example in the same manner as in Example 11 (resin A content: 28%).

[Comparative Example 1]
A hard coat film of this example was obtained in the same manner as in Example 1 except that the resin A of the coating liquid a was changed to the resin D and the addition amount was changed to 95 parts (solid content 42.5 parts). .

[Comparative Example 2]
A hard coat film of this example was obtained in the same manner as in Example 1 except that the resin A of the coating liquid a was changed to the resin E and the addition amount was changed to 95 parts (solid content 42.75 parts). .

[Comparative Example 3]
A hard coat film of this example was obtained in the same manner as in Example 1 except that the amount of the resin A added to the coating solution a was changed to 40 parts (solid content 16 parts).

[Comparative Example 4]
A hard coat film of this example was obtained in the same manner as in Example 1 except that the amount of the resin A added to the coating liquid a was changed to 300 parts (120 parts solids).

[Comparative Example 5]
Implementation was performed except that the resin A of the coating liquid a was not added (addition amount was zero), the matting agent A of the coating liquid a was changed to the matting agent E, and the addition amount was changed to 0.14 parts. The hard coat film of this example was obtained in the same manner as in Example 1.

[Comparative Example 6]
Implementation was performed except that the resin A of the coating liquid a was not added (the addition amount was zero), the matting agent A of the coating liquid a was changed to the matting agent D, and the addition amount was changed to 0.14 parts. The hard coat film of this example was obtained in the same manner as in Example 1.

[Comparative Example 7]
The amount of resin A added to coating solution a was changed to 27.8 parts (solid content 11.1 parts). Further, a hard coat film of this example was obtained in the same manner as in Example 1 except that the matting agent A of the coating liquid a was changed to the matting agent D and the addition amount thereof was changed to 0.14 part.

  Table 1 summarizes information such as the types (A to E) and content ratios of the resins used in each example, and the types (A to E) and addition amounts of the matting agents used in each example.

[Evaluation]
The following evaluation was performed about the hard coat film obtained by each example. The results are shown in Table 2.

1. Sparkle Size: 3 inches, Resolution: 480 x 854 dpi Wide VGA liquid crystal (display element) The entire liquid crystal display screen is displayed in green, and each hard coat film is placed on the liquid crystal display screen. The liquid crystal display screen was observed. As a result, “◎” indicates that the sparkle was not visible at all, “◯” indicates that the sparkle was slightly visible but did not hinder, and “0” indicates that the sparkle was slightly inferior to the “◯” evaluation, “△”, and “×” means that the sparkle was clearly visible.

2. Newton ring prevention property Each hard coat film was placed on a glass plate having a smooth surface so that the optical functional layer was in close contact, and pressed with a finger, and the state of occurrence of Newton rings was visually observed. As a result, the case where the Newton ring was not visible was indicated as “◯”, and the case where the Newton ring was visible as “x”.

3. Antiglare property Each hard coat film was placed on a black base under a three-wavelength fluorescent lamp so that the optical functional layer was on the upper surface, and reflection of the fluorescent lamp was visually evaluated. As a result, “◯” indicates that the outline of the fluorescent lamp was not reflected, and “△” indicates a slight reflection.

4). Surface hardness Each hard coat film is placed on a black base under a three-wavelength fluorescent lamp so that the optical functional layer is on the upper surface, and # 0000 steel wool is rubbed 5 times with a load of 200 g / about 2 cm ² (5 times) Reciprocating), and scratches on the surface were visually observed. As a result, “◎” indicates that no scratches were seen, “○” indicates that scratches were hardly visible, “△” indicates that scratches were slightly visible but had no problem, and “S” was clearly visible. It was set as “x”.

5. Surface properties Confocal laser microscope (VK-9710, manufactured by Keyence Corp.) was used for each of the five convex portions of the optical functional layer of some hard coat films, and the objective lens: 150 times, height Photographed under the condition of measurement pitch: 0.01 μm. And from the uneven | corrugated profile of the cross section cut | disconnected along one direction (Y direction) of the obtained uneven | corrugated shape, about 5 convex parts, the height H and skirt length L of a convex part are calculated | required, respectively, The surface property was evaluated by calculating the aspect ratio (ratio H / L of H to L). Finally, an average (Ave.) of five calculated values was used as the aspect ratio of each hard coat film.

[Discussion]
As shown in Table 1 and Table 2, in Examples 1 to 17, the ionizing radiation curable resin and any of the resins A to C corresponding to the compound A2 are included in the coating solution as the resin. Including. As a result, all the obtained hard coat films were excellent in sparkle prevention. At the same time, the surface hardness was greatly increased.

In particular, in Examples 1, 5, and 6, the ratio of the ionizing radiation curable resin and the resin A or C corresponding to the compound A2 in the coating solution is in the optimum range, and in Example 4, it is also in the optimum range. Compared with the blended resin B, the blended resin A or C has a higher glass transition temperature. As a result, it was confirmed that each of the obtained hard coat films was extremely excellent in sparkle prevention properties (◎).
In Example 7, the same resin content as in Examples 1, 5, and 6 was used in the same amount. However, unlike Examples 1, 5, and 6, a matting agent having a coefficient of variation of particle distribution exceeding 15% was used. Used alone. Therefore, compared with the other Examples 1-6, although a slight inferior in sparkle prevention property was recognized, it was at a sufficiently excellent sparkle prevention level.

In Examples 10-13, compared with Examples 1-7, the matting agent with a small average particle diameter was used independently, and the addition amount was reduced to 20%. In Examples 8 and 9, as compared with Examples 1 to 7, a matting agent having a smaller average particle diameter than that of Examples 10 to 13 was used alone, and the addition amount was reduced to 20%. In Examples 14 and 15, the addition amount of the matting agent was reduced to 20% as compared with Examples 1 to 7. In Examples 16 and 17, unlike Examples 1 to 15, two matting agents having different average particle sizes are used in combination, and compared to Examples 1 to 7, mats are similar to Examples 8 to 15. The amount of agent added was reduced to 20%.
However, in all of Examples 8 to 17, the content ratio of the resin A, B, or C was appropriate as in Examples 1 to 7. Therefore, it was confirmed that excellent results were obtained in the same manner as in Examples 1, 5, and 6, that is, the obtained hard coat films were extremely excellent in sparkle prevention (ル).

On the other hand, in Comparative Example 1, the weight ratio of the ionizing radiation curable resin and the resin D in the coating solution is within the range of the present invention, but the glass transition temperature of the used resin D is low and the weight average molecular weight is also low. Is small. Therefore, the obtained hard coat film could not prevent sparkle. In Comparative Example 1, no reactive functional group is introduced into the resin D used. Therefore, the obtained hard coat film was inferior in surface hardness.
In Comparative Example 2, the weight ratio of the ionizing radiation curable resin to the resin E in the coating solution, the glass transition temperature of the resin E used, and the weight average molecular weight are all within the scope of the present invention. A reactive functional group is not introduced into E. Therefore, although the obtained hard coat film could prevent sparkle, the surface hardness was inferior.

  In Comparative Examples 3 and 4, the resin A was included in the coating solution, but the weight ratio between the resin A and the ionizing radiation curable resin was outside the scope of the present invention. Therefore, each obtained hard coat film could not prevent sparkle (Comparative Example 3), or the hardness was extremely inferior (Comparative Example 4).

  In Comparative Examples 5 and 6, none of the resins A to E was included in the coating solution. Therefore, although each of the obtained hard coat films had increased surface hardness, sparkle could not be prevented.

  In Comparative Example 7, the resin A was included in the coating solution, but the weight ratio between the resin A and the ionizing radiation curable resin was outside the scope of the present invention. Therefore, the obtained hard coat film could not prevent sparkle as in Comparative Examples 3 and 4. In Comparative Example 7, compared with Comparative Example 3, a matting agent having a small average particle diameter was used, and the amount added was reduced to 20%. Therefore, the obtained hard coat film had an increased surface hardness as compared with Comparative Example 3.

Claims (21)

A hard coat having an optical functional layer comprising a matting agent and a cured product of a curable composition containing an ionizing radiation curable resin as a resin component, and having a plurality of convex portions due to the matting agent on the surface A film,
The curable composition further includes one or more of the following (a) and (b) as a resin component:
Content ratio in total resin content is ionizing radiation curable resin: 50% by weight or more and less than 85% by weight, and the following (a) and (b): more than 15% by weight and 50% by weight or less Hard coat film.
(A) a compound having a photocurable unsaturated group introduced into a thermoplastic resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more;
(B) A compound having a photocurable unsaturated group introduced into a thermosetting resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more.   The hard coat film according to claim 1, wherein the convex portion has an aspect ratio of 0.043 or more. A hard coat having an optical functional layer comprising a matting agent and a cured product of a curable composition containing an ionizing radiation curable resin as a resin component, and having a plurality of convex portions due to the matting agent on the surface A film,
The curable composition further includes one or more of the following (a) and (b) as a resin component:
A hard coat film, wherein the convex portion has an aspect ratio of 0.043 or more.
(A) a compound having a photocurable unsaturated group introduced into a thermoplastic resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more;
(B) A compound having a photocurable unsaturated group introduced into a thermosetting resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more.   The hard coat film according to claim 1, wherein the matting agent has an average particle diameter of 0.1 to 10 μm.   The sheet according to any one of claims 1 to 4, wherein the matting agent is a combination of a plurality of matting agents having different average particle sizes, and at least a first particle having an average particle size of 0.1 to 4.0 µm. A hard coat film comprising a matting agent and a second matting agent having an average particle diameter of 3.0 to 10.0 μm.   6. The sheet according to claim 5, wherein the matting agent is a combination of only the first matting agent and the second matting agent, and each has a variation coefficient of particle size distribution of 15% or less. A hard coat film characterized by that.   The sheet according to claim 5 or 6, wherein a weight ratio of the first mat agent to the second mat agent in all the mat agents is 8: 2 to 6: 4. Hard coat film.   The hard coat film according to any one of claims 1 to 7, wherein the matting agent is contained in a range of 0.05 to 5 parts by weight with respect to 100 parts by weight of a resin component. .   The film according to any one of claims 1 to 8, wherein the optical functional layer is an antiglare layer that exhibits an antiglare effect or a Newton ring prevention layer that suppresses generation of interference fringes. Coat film.   The film according to any one of claims 1 to 8, wherein a (meth) acryloyl group is used as a photocurable unsaturated group of at least one of the compound (a) and the compound (b). Features a hard coat film.   In the display element with a surface member in which the surface member is disposed on the display element, the surface member includes the hard coat film according to any one of claims 1 to 8 in at least a part thereof. With display element.   In the display element with a surface member in which a surface member is disposed on the display element, the surface member is used as at least one of the antiglare layer and the Newton ring prevention layer as the optical functional layer. A display element with a surface member comprising the hard coat film described above.   The display element according to claim 12, wherein the surface member is a protective plate, a touch panel, or a polarizing film. In the curable composition for forming an optical functional layer that expresses at least one optical function of antiglare effect and suppression of occurrence of interference fringes,
Contains resin and matting agent
The resin component includes an ionizing radiation curable resin and one or more of the following (a) and (b):
Content ratio in total resin content is ionizing radiation curable resin: 50% by weight or more and less than 85% by weight, and the following (a) and (b): more than 15% by weight and 50% by weight or less Curable composition.
(A) a compound having a photocurable unsaturated group introduced into a thermoplastic resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more;
(B) A compound having a photocurable unsaturated group introduced into a thermosetting resin, a weight average molecular weight of 70,000 or more, and a glass transition temperature of 45 ° C. or more.   The hard coat film according to claim 9, wherein a (meth) acryloyl group is used as a photocurable unsaturated group of at least one of the compound (a) and the compound (b). .   A display element with a surface member, wherein a surface member is disposed on the display element, wherein the surface member includes at least a part thereof the hard coat film according to claim 9.   A display element with a surface member, wherein a surface member is disposed on the display element, wherein the surface member includes the hard coat film according to claim 10 at least in part.   The hard coat film according to claim 9, wherein in the display element with a surface member in which the surface member is disposed on the display element, the surface member uses the optical function layer as at least one of an antiglare layer and a Newton ring prevention layer. A display element with a surface member characterized by comprising.   In the display element with a surface member which has arrange | positioned the surface member on the display element, The said surface member is a hard coat film of Claim 10 using the said optical function layer as at least one of a glare-proof layer and a Newton ring prevention layer. A display element with a surface member characterized by comprising.   The display element with a surface member according to claim 18, wherein the surface member is a protective plate, a touch panel, or a polarizing film.   The display element according to claim 19, wherein the surface member is a protective plate, a touch panel, or a polarizing film.

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