KR102030210B1 - Display element front-face film, and display element provided with surface member - Google Patents

Abstract

It provides technology that can satisfy anti-glare, anti-Newton ring and sparkle. The optical functional layer 12 is laminated | stacked on the transparent base material 11 in the film 1 for front surfaces of a display element. The optical functional layer 12 is comprised from the hardened | cured material of a specific curable composition. The curable composition contains a resin powder and a mat agent. The resin powder contains an ionizing radiation curable resin and one or more of the following (a) and (b), and the content ratio in all the resin powders is ionizing radiation curable resin: 50% by weight or more and less than 85% by weight, (a) And (b): over 15% by weight and 50% by weight or less, and the matting agent has a coefficient of variation of the particle size distribution of 15% or less.
(a) a thermoplastic resin having a weight average molecular weight of 70,000 or more and a glass transition temperature of 45 ° C or more,
(b) Thermosetting resin whose weight average molecular weight is 70,000 or more, and glass transition temperature is 45 degreeC or more.

Description

Display element front-face film, and display element provided with surface member}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display element front film suitable for use as a surface member or the like arranged on a screen of various display elements, and a display element with a surface member having a surface member including the film disposed on the screen.

On the screen of various display elements (liquid crystal display element, plasma display element, etc.), the anti-glare film is disposed for the purpose of protecting the surface thereof and preventing difficulty in viewing due to glare caused by the reflection of external light on the screen. There is a case. The anti-glare film is subjected to the surface concave-convex treatment, and the above-mentioned concave-convex treatment can be performed on the surface of the anti-glare film by providing a hard coat layer containing particles of a mat agent on the substrate as an anti-glare layer.

In recent years, however, high definition of various display devices has been developed. As a result, when the conventional anti-glare film provided with the anti-glare layer which consists of a hard-coat layer containing a mat agent as particle | grains is used on the screen of a display element, the some convex part formed centering on the particle | grains in a hard-coat layer The so-called sparkle (sparkling phenomenon) which the RGB light emission point expands and emphasizes by the lens action | occurrence | production has arisen on the hard-coat layer surface. This caused a problem that high-definition color screens looked shiny.

Further, as the surface member disposed on the screen of various display elements, there are touch panels and the like in addition to the anti-glare film described above. In these surface members, interference fringes (Newton rings) sometimes occur due to partial narrowing of the space between the surface member and the display element and the space 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 convex portions formed with matt particles in the center of the uneven layer. As a result, even if a part of surface member bends, the space | interval of an uneven | corrugated layer and various display elements is maintained more than predetermined by the convex part formed in multiple numbers, and this prevents a Newton ring. However, also in the Newton-ring prevention layer, the same problem (sparkle generation) as the above-mentioned anti-glare layer has arisen.

Thus, although the mat agent is necessary for expressing the antiglare property and the anti-Newton ring property, sparkle is generated by the lens formed around the mat agent. At the same time, it was difficult to satisfy.

Moreover, although the technique (patent document 1) which makes a newton ring prevention layer contain other resin components other than ionizing radiation curable resin (patent document 1), and the technique which enlarges the variation coefficient of the particle size distribution of the mat agent in a Newton ring prevention layer (patent document 2) are proposed, In recent years, there is a demand for a technology that can further prevent the appearance of sparkle for color display devices that have been more sophisticated.

Japanese Patent Publication No. 2005-265863 Japanese Patent Publication No. 2005-265864

One aspect of the present invention provides a technique capable of simultaneously satisfying both characteristics of anti-glare, anti-Newton ring, and anti-sparkle.

When the present inventors include a specific resin powder (at least one of the thermoplastic resin and the thermosetting resin) in the composition containing the mat agent and the ionizing radiation curable resin, the flow of the ionizing radiation curable resin is further suppressed during the curing of the composition. do. As a result, the occurrence of the undulation of the resin powder after curing was further suppressed, whereby it was found that the generation of sparkle can be more effectively prevented, thereby completing the present invention.

The display element front film of the present invention is disposed on the front of the display element,

It has an optical function layer comprised by the mat agent and the hardened | cured material of the curable composition containing the ionizing radiation curable resin as a resin powder,

The curable composition further comprises one or more of the following (a) and (b) as a resin powder,

The content ratio in all resin powder is ionizing radiation curable resin: 50 weight% or more and less than 85 weight%, following (a) and (b): more than 15 weight% and 50 weight% or less,

The matting agent is characterized in that the coefficient of variation of the particle size distribution is 15% or less.

In the display device with a surface member according to the first aspect of the present invention, a surface member is disposed on the display element, and the surface member includes at least a portion of the display element front film of the present invention.

In the display device with a surface member according to the second aspect of the present invention, a surface member is disposed on the display device, and the front surface of the display device of the present invention uses the surface member as at least one of an anti-glare layer and a Newton ring prevention layer. It comprised with the film for characteristics.

The curable composition of the present invention is used to form an optical functional layer that expresses at least one optical function among antiglare effects and suppression of interference fringes,

It contains resin powder and mat agent,

The resin powder comprises an ionizing radiation curable resin and at least one of the following (a) and (b),

The content ratio in all resin powder is ionizing radiation curable resin: 50 weight% or more and less than 85 weight%, following (a) and (b): more than 15 weight% and 50 weight% or less,

The matting agent is characterized in that the coefficient of variation of the particle size distribution is 15% or less.

(a) a thermoplastic resin having a weight average molecular weight of 70,000 or more and a glass transition temperature of 45 ° C or more,

(b) Thermosetting resin whose weight average molecular weight is 70,000 or more, and glass transition temperature is 45 degreeC or more.

The present invention includes the following aspects.

(1) The film for front surface of a display element and a curable composition WHEREIN: A mat agent can be comprised by the thing whose average particle diameter is 0.5-10 micrometers.

(2) In the film for front surface of a display element, and a curable composition, an optical function layer can be used as a Newton ring prevention layer which suppresses generation | occurrence | production of an anti-glare layer or an interference fringe which expresses an anti-glare effect.

(3) In the film for front surface of a display element and a curable composition, what introduce | transduced the (meth) acryloyl group can be used as at least any one of the thermoplastic resin of (a) and the thermosetting resin of (b).

(4) In the display element with a surface member according to the first aspect, the display element front film of the present invention using the optical functional layer as an antiglare layer on the surface side of the surface member may be included. In addition, the back surface of the surface member may include a film for the front surface of the display device of the present invention using the optical functional layer as a Newton ring prevention layer. In addition, the surface member may be composed of a protective plate, a touch panel or a polarizing film.

(5) In the display element with a surface member according to the second aspect, the surface member may be composed of a protective plate, a touch panel or a polarizing film.

(6) In the display element with surface member of the present invention, the surface member is disposed on the display element, the surface member is a touch panel, and the display of the present invention using the outermost surface member of the touch panel as an optical functional layer as an antiglare layer. It can comprise with a film for element front surfaces.

In the display element with surface member of the present invention, a surface member is disposed on the display element, and the surface member is a touch panel, and the outermost surface member, the middle member, and the rearmost surface of the touch panel. At least one of the) members can be constituted by the display element front film of the present invention using the optical functional layer as a Newton ring prevention layer.

According to the present invention, since a specific resin powder (at least one of the thermoplastic resin and the thermosetting resin) is contained in the composition containing the mat agent for forming the optical functional layer and the ionizing radiation curable resin, the undulation of the resin powder after curing is prevented. It is further suppressed. As a result, the obtained coating film can satisfy | fill both characteristics of anti-glare property, Newton ring prevention property, and sparkle prevention property simultaneously.

That is, when the curable composition of this invention is used, the coating film (optical functional layer) which satisfy | fills both characteristics of anti-glare property, Newton ring prevention property, and sparkle prevention property simultaneously can be obtained.

Since the display element front film and the display element with a surface member of this invention have an optical functional layer comprised from the hardened | cured material of the curable composition of this invention, both the anti-glare property, anti-Newton ring resistance, and sparkle prevention property are satisfied simultaneously.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows an example of the film for the front of a display element of this invention.
2 is a cross-sectional view showing an example of a conventional display element front film.
3 is a cross-sectional view showing an example of a display element with a surface member of the present invention.
4 is a cross-sectional view showing another example of the display element with a surface member of the present invention.
5 is a cross-sectional view showing another example of the display element with a surface member of the present invention.
6 is a cross-sectional view showing another example of the display element with a surface member of the present invention.
Explanation of the sign
One… Film for front surface of display element; Transparent substrate, 12... Optical functional layer, 121... Resin powder (binder), 122... Mat, 2... Surface member, 2a... Shroud, 2b... Touch panel, 2c... Polarizer, 3... Display elements 4, 4a, 4b, 4c... Display element with surface member.

As shown in FIG. 1, the optical element layer 12 is laminated | stacked on the transparent base material 11 for the film 1 for display element front surfaces of this example.

As the transparent base material 11, the transparent film formed from materials, such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triacetyl cellulose, and acryl, is mentioned, for example. . Among these, a stretched, especially biaxially stretched, polyethylene terephthalate film is preferable because of its excellent mechanical strength and dimensional stability. Moreover, the thing which improved the adhesiveness with the optical function layer 12 by providing a corona discharge process on the surface of the transparent base material 11, or providing an easily bonding layer is used suitably. As thickness of the transparent base material 11, it is 25-500 micrometers generally, Preferably it is 50-200 micrometers.

As the optical functional layer 12, an anti-glare layer which exhibits an anti-glare effect, a Newton-ring prevention layer which suppresses generation | occurrence | production of an interference fringe (Newton ring), etc. are mentioned. The optical function layer 12 contains the resin powder 121 and the mat agent 122, and is comprised from the hardened | cured material of a curable composition.

The curable composition of this example contains a resin powder and a mat agent. In addition, the resin powder mentioned in this example contains curable resin or a thermoplastic resin. In addition, the hardened | cured material as used in this example is used with the concept containing hardening resin as a hardening subject, and also a curing initiator, such as a polymerization initiator, a polymerization accelerator (such as an ultraviolet sensitizer), and a hardening | curing agent required for hardening of this curable resin.

The resin powder of this example contains at least an ionizing radiation curable resin. As an ionizing radiation curable resin, what is crosslinked and cured by irradiation with ionizing radiation (ultraviolet rays or electron beams) is used. As such a thing, what mixed 1 type (s) or 2 or more types, such as a photocationic polymerizable resin which can be photocationic polymerization, the photopolymerizable prepolymer which can be photoradically polymerized, or a photopolymerizable monomer, can be used.

Examples of the photocationic polymerizable 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 crosslinking to be a three-dimensional network structure is particularly preferably used. Urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate, polyfluoroalkyl acrylate, silicone acrylate, etc. can be used as this acryl-type prepolymer. Moreover, although these acrylic prepolymers can be used independently, it is preferable to add a photopolymerizable monomer in order to improve crosslinking curing property and to improve the hardness of a functional layer further.

As a photopolymerizable monomer, Monophotoacous acrylate monomers, such as 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, butoxyethyl acrylate, 1, 6- hexanediol diacrylate, Bifunctional acrylic monomers such as neopentyl glycol diacrylate, diethylene glycol diacrylate, polyethylene glycol diacrylate, hydroxy pivalic acid ester neopentyl glycol diacrylate, dipentaerythritol hexaacrylate, trimethyl propane triacryl 1 type, or 2 or more types, such as polyfunctional acrylic monomers, such as a rate and a pentaerythritol triacrylate, are used.

In addition to the above-mentioned photocationic polymerizable resin, photopolymerizable prepolymer, or photopolymerizable monomer, the ionizing radiation curable resin preferably contains a curing aid such as a photopolymerization initiator or an ultraviolet sensitizer when cured by ultraviolet irradiation.

As a photoinitiator, radical photopolymerization initiators, such as acetophenone, benzophenone, Michler's ketone, benzoin, benzyl methyl ketal, benzoyl benzoate, (alpha)-acyl oxime ester, thioxanthone, onium salt, sulfonic acid ester, And photocationic polymerization initiators such as an organometallic complex. Examples of the ultraviolet sensitizer include n-butylamine, triethylamine, tri-n-butylphosphine, and the like.

In addition, the photopolymerization accelerator can reduce the polymerization impairment caused by air at the time of curing to increase the curing speed, and examples thereof include p-dimethylamino benzoic acid isoamyl ester and p-dimethylamino benzoic acid ethyl ester.

Moreover, you may use an ionizing radiation curable organic-inorganic hybrid resin as an ionizing radiation curable resin. An ionizing radiation curable organic inorganic hybrid resin (hereinafter sometimes simply abbreviated as "organic inorganic hybrid resin") is a method of mixing organic and inorganic materials, unlike conventional composites represented by glass fiber reinforced plastic (FRP). It is a close and dispersed state at the molecular level or close to it, and the inorganic component and the organic component can react and form a film by irradiation of ionizing radiation.

Examples of the inorganic component in the organic inorganic hybrid resin include metal oxides such as silica and titania, and preferably silica. As silica, the reactive silica in which the photosensitive group which has photopolymerization reactivity is introduce | transduced on the surface is mentioned. 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, and more preferably 40% by weight or less.

As the organic component in the organic inorganic hybrid resin, a compound having a polymerizable unsaturated group polymerizable with the inorganic component (preferably reactive silica) (for example, a polyunsaturated organic compound having two or more polymerizable unsaturated groups in a molecule, or in a molecule) Monovalent unsaturated organic compound etc. which have one polymerizable unsaturated group) are mentioned.

In this example, one or more of a specific thermoplastic resin and a thermosetting resin are contained in curable composition with the ionizing radiation curable resin mentioned above.

The ionizing radiation curable resin has a property of curing while flowing in the curing process. Therefore, when trying to obtain hardened | cured material using the curable composition containing a mat agent and an ionizing radiation curable resin, an ionizing radiation curable resin flows at the time of hardening of this curable composition, As a result, as shown in FIG. 2, a mat agent "Round-up" of the resin powder 121a around the 122a occurs, and a lens shape is formed. And this was the cause and the sparkle generate | occur | produced in the conventional film 1a which has the optical function layer 12a containing the mat agent 122a and the resin powder 121a.

In this example, by including at least one of a thermoplastic resin and a thermosetting resin together with the ionizing radiation curable resin, the flow of the ionizing radiation curable resin is further suppressed during the curing process, and as a result, the resin powder after curing as shown in FIG. The generation of "undulation" of (121) can be further suppressed, whereby generation of sparkle in the optical functional layer 12 after curing can be prevented even more effectively.

Examples of the thermoplastic resin include polyester resins, acrylic resins, polycarbonate resins, cellulose resins, acetal resins, vinyl resins, polyethylene resins, polystyrene resins, polypropylene resins, polyamide resins, Polyimide resin, fluorine resin and the like.

Examples of the thermosetting resin include polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, epoxy resins, melamine resins, phenol resins, and silicone resins.

Comparing thermoplastic resin and thermosetting resin, a thermoplastic resin is suitable at the point that surface shape is easy to adjust and it is excellent in handleability.

You may introduce a (meth) acryloyl group into a thermoplastic resin and thermosetting resin. By introducing a (meth) acryloyl group, it can be firmly combined with an ionizing radiation curable resin.

In this example, as a thermoplastic resin and / or a thermosetting resin, especially glass transition temperature (Tg) is 45 degreeC or more, Preferably it is 80 degreeC or more, More preferably, it is 90 degreeC or more. By using the thermoplastic resin and / or thermosetting resin whose Tg is 45 degreeC or more with an ionizing radiation curable resin, it is easy to suppress the flow of an ionizing radiation curable resin in hardening process.

In addition, Tg of the thermosetting resin in this example is a thing before hardening.

In this example, the thermoplastic resin and / or the thermosetting resin have a weight average molecular weight (Mw) of 70,000 or more, preferably 80,000 or more. By using a thermoplastic resin and / or thermosetting resin having a Mw of 70,000 or more together with the ionizing radiation curable resin, it is possible to easily suppress the flow of the ionizing radiation curable resin in the curing process.

That is, in this example, one or more of following (a) and (b) is included with an ionizing radiation curable resin.

(a) a thermoplastic resin having a weight average molecular weight of 70,000 or more and a glass transition temperature of 45 ° C or more,

(b) Thermosetting resin whose weight average molecular weight is 70,000 or more, and glass transition temperature is 45 degreeC or more.

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

In this example, the weight ratio of the ionizing radiation curable resin and the thermoplastic resin and / or thermosetting resin is preferably 50% by weight or more and less than 85% by weight of the former, more than 15% by weight and 50% by weight or less of the former, and more preferably 60 The weight ratio is 80% by weight or less, the latter 20% by weight or more and 40% by weight or less, and more preferably 60% by weight or more and 75% by weight or less, the latter 25% by weight or more and 40% by weight or less. By using the thermoplastic resin and / or the thermosetting resin in an amount exceeding 15% by weight, it is possible to sufficiently suppress the occurrence of ups and downs and to easily prevent the sparkle. By setting the thermoplastic resin and / or the thermosetting resin to 50% by weight or less, it is easy to prevent the decrease in the coating film strength due to the inclusion of the thermoplastic resin and / or the thermosetting resin more than necessary.

As the mat agent, inorganic particles (for example, calcium carbonate, magnesium carbonate, barium sulfate, aluminum hydroxide, silica, kaolin, clay, talc, etc.), resin particles (for example, acrylic resin particles, polystyrene resin particles, polyurethane resin particles) , Polyethylene resin particles, benzoguanamine resin particles, epoxy resin particles, and the like). Especially, spherical microparticles are preferable from a viewpoint of handleability and the ease of control of a surface shape. In addition, the resin particles are suitable in that the resin powder and the refractive index difference are close to each other, the generation of sparkle is easy to be prevented, and the transparency is difficult to be impaired.

In this example, the matting agent has a coefficient of variation of the particle size distribution of 15% or less, preferably 10% or less (so-called monodisperse particles are preferable). By using a mat agent having a coefficient of variation of the particle size distribution of 15% or less, it is possible to prevent the occurrence of sparkles due to local large convex portions.

The coefficient of variation (CV value) is a value indicating the dispersion state of the particle size distribution, and is a percentage of the value obtained by dividing the standard deviation (square root of the uneven dispersion) of the particle size distribution by the arithmetic mean value (average particle size) of the particle diameter. That is, it shows how much the spread (variance of particle diameter) of particle distribution is with respect to an average value (arithmetic mean diameter), and it is usually calculated | required by CV value (unitless) = (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).

Since the average particle diameter of a mat agent differs according to the thickness of a functional layer, it cannot be said uniformly, Preferably it is 0.5 micrometer or more, More preferably, it is 1 micrometer or more, Preferably it is 10 micrometers or less, More preferably, 8 It is set to micrometer or less. By setting the average particle diameter of the mat agent to 10 µm or less, it is easy to prevent the occurrence of sparkle, and by setting the average particle diameter to 0.5 µm or more, the antiglare property and the Newton ring prevention property can be easily expressed.

The content of the mat 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 or less, further preferably 100 parts by weight of the resin powder. Shall be 1 part by weight or less. By setting the content with respect to 100 parts by weight of the resin powder to 5 parts by weight or less, it is easy to prevent the sparkle from occurring, and by setting the content to 0.05 parts by weight or more, the antiglare property and the anti-Newton ring resistance can be easily expressed.

In addition, the "average particle diameter" and the "variation coefficient of particle size distribution" of the mat agent in this example are the values measured by the Coulter counter method.

The Coulter Counter method is a method of electrically measuring the number and size of matte particles dispersed in a solution. When the particles are dispersed in an electrolytic solution and passed through the pores through which electricity flows using suction force, It is a method of measuring voltage pulses proportional to the volume of particles because the electrolyte is substituted and the resistance increases. Therefore, by measuring the height and the number of these voltage pulses electrically, the number of particles and the individual particle volume are measured to obtain a particle diameter and a particle diameter distribution.

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

The optical function layer 12 can be hardened by apply | coating, drying, and ionizing radiation irradiation of the curable composition of this example mentioned above on the transparent base material 11, and can be formed by this.

As for the optical function layer 12, it is preferable that pencil hardness of JIS-K5400: 1990 is F or more from a viewpoint of a damage prevention. More preferably, it is H or more, More preferably, it is 2 H or more, Especially preferably, it is 3 H or more.

The thickness of the optical functional layer 12 becomes like this. Preferably it is 0.5 micrometer or more, More preferably, it is 1 micrometer or more, Preferably it is 10 micrometers or less, More preferably, it is 5 micrometers or less, Especially preferably, it is 3 micrometers or less.

In order to prevent the sparkle, the display element front film 1 of this example is preferably 90% or more in total light transmittance (JIS K7361-1: 1997) and 10% or less in haze (JIS K7136: 2000).

3 to 6, the display element 4 (4a, 4b, 4c) with the surface member of this example is constructed by disposing the surface member {2 (2a, 2b, 2c)} on the display element 3. It is.

As the display element 3, a liquid crystal display element, a CRT display element, a plasma display element, an EL display element, etc. are mentioned, for example. As the surface member 2, the protective plate 2a, the touch panel 2b, the polarizing plate 2c, etc. are mentioned, for example. 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 comprised by the transparent resin board etc. which are represented by an acrylic resin board, 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, a surface member adheres by laminating | stacking the display element front film 1 of this example as an anti-glare film on the surface side of the protective plate 2a. You may comprise the display element 4a. As shown in FIG. 4, the display element 4a with a surface member can also be comprised by laminating | stacking 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 2a having anti-glare property and / or anti-Newton ring resistance.

In addition, when the surface member 2 is the touch panel 2b, as shown in FIG. 3, a surface member adheres by laminating | stacking the display element front film 1 of this example as an anti-glare film on the surface side of the touch panel 2b. You may comprise the display element 4b. As shown in FIG. 4, the display element 4b with a surface member can also be comprised by laminating | stacking 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 surface members by using the display element front film 1 itself of this example as an anti-glare film as a member of the outermost surface of the touch panel 2b. Although not shown, the display element 4b with the surface member may be constituted by using the film 1 for the front face of the display element of the present example as a member of the outermost, middle, and rearmost surfaces of the touch panel 2b as the anti-Newton ring film. It is possible.

Moreover, when the surface member 2 is a polarizing film 2c, as shown in FIG. 3, the film 1 for front surfaces of a display element of this example is bonded together as an anti-glare film on the surface side of the polarizing film 2c. By this, the display element 4c with a surface member can be comprised.

Since the display element 4 (4a, 4b, 4c) with the surface member of this example of the above-mentioned structure comprises the optical function layer 12 with the hardened | cured material of the curable composition of this example, predetermined | prescribed function (anti-glare property, Newton) And anti-sparkling can be prevented.

Example

EMBODIMENT OF THE INVENTION Below, the Example which actualized embodiment of this invention is given and it demonstrates in detail. In addition, in this Example, "part" and "%" are a basis of weight unless there is particular notice.

In addition, in this example, resin A-F and mat A-C used the following.

[Resin A] Thermoplastic acrylic resin (Acrydic A195: DIC, 40% of solid content, glass transition temperature 94 degreeC, weight average molecular weight 85,000),

[Resin B] Thermoplastic acrylic resin (Acrydic A166: DIC, 45% of solid content, glass transition temperature 49 degreeC, weight average molecular weight 75,000),

[Resin C] Thermoplastic acrylic resin (Acrydick WDL-787: DIC, 40% of solid content, glass transition temperature 90 degreeC, weight average molecular weight 72,000),

[Resin D] Thermoplastic acrylic resin (Acrydick 49-394-IM: DIC, 50% of solid content, glass transition temperature 16 degreeC, weight average molecular weight 65,000),

[Resin E] Thermoplastic acrylic resin (Acrydic A165: DIC, 45% of solid content, glass transition temperature 66 degreeC, weight average molecular weight 42,000),

[Matt agent A] Acrylic resin particle (MX-500: Soken Chemical Industries, Ltd., 5 micrometers of average particle diameters, 9% of variation coefficient)

[Matte B] Acrylic resin particle (technical polymer SSX-105: Sekisui Chemicals, Inc., average particle diameter 5.3 micrometers, coefficient of variation 8.5%)

[Matt agent C] Acrylic resin particles (technical polymer MB20X-5: Sekisui Chemicals, Inc., 5 micrometers in average particle diameter, coefficient of variation: about 20%).

Example 1

The coating liquid a of the following prescription was apply | coated, dried, and irradiated on one side of the transparent polyester film (Cosmoshine A4350: Toyo Boseki Co., Ltd.) with a thickness of 125 micrometers, and the optical functional layer of thickness 3micrometer was formed, and the indication of Example 1 was carried out. The film for the front of an element was obtained. In addition, the weight conversion amount of solid content was shown in parentheses.

<Coating liquid a>

125 parts (100 parts) of ionizing radiation curable resin (80% solids)

(Unidic 17-813: DIC Corporation),

Resin A 107 parts (42.8 parts)

Photopolymerization Initiator Part 3

(Irukacure 184: Chiba Japan company)

Matt A 0.7 parts

200 parts of diluted solvents

Example 2

Except having changed the resin A addition amount of the coating liquid a into 65 parts (solid content 26 parts), it carried out similarly to Example 1, and obtained the film for the front of a display element of this example.

Example 3

Except having changed the resin A addition amount of the coating liquid a into 250 parts (100 parts of solid content), it carried out similarly to Example 1, and obtained the display element front film of this example.

Example 4

Except having changed the resin A of the coating liquid a into resin B, and changing the addition amount into 95 parts (solid content 42.75 parts), it carried out similarly to Example 1, and obtained the display element front film of this example.

Example 5

Except having changed the mat agent A of the coating liquid a into the mat agent B, it carried out similarly to Example 1, and obtained the display element front film of this example.

Example 6

Except having changed resin A of the coating liquid a into resin C, it carried out similarly to Example 1, and obtained the display element front film of this example.

Comparative Example 1

Except having changed the resin A of the coating liquid a into resin D, and changing the addition amount into 85 parts (solid content 42.5 parts), it carried out similarly to Example 1, and obtained the display element front film of this example.

Comparative Example 2

Except having changed the resin A of the coating liquid a into resin E, and changing the addition amount into 95 parts (solid content 42.75 parts), it carried out similarly to Example 1, and obtained the display element front film of this example.

Comparative Example 3

Except having changed the resin A addition amount of the coating liquid a into 40 parts (16 parts of solid content), it carried out similarly to Example 1, and obtained the display front film of this example.

[Comparative Example 4]

Except having changed the resin A addition amount of the coating liquid a into 300 parts (120 parts of solid content), it carried out similarly to Example 1, and obtained the film for display fronts of this example.

[Comparative Example 5]

Except having changed the mat agent A of the coating liquid a into the mat agent C, it carried out similarly to Example 1, and obtained the display element front film of this example.

[evaluation]

The following evaluation was performed about the film for front surfaces of the display elements obtained by each example. The results are shown in Table 1.

Sparkle

Size: 3 inches, resolution: 480 * 854dpi The liquid crystal display screen whole surface of the wide VGA liquid crystal (display element) was made into the green display, and the film for each display element front surface was mounted on the liquid crystal display screen visually. The liquid crystal display screen was observed. As a result, "(circle)" which could not visually recognize a sparkle was able to visually recognize the sparkle a little, but "(circle)" which made it possible to visually recognize "(circle)" and the sparkle was made into "x".

2. Newton ring prevention

The film for front surface of each display element was raised so that an optical function layer might adhere on the glass plate with a smooth surface, and it pressed firmly with a finger, and the state of the Newton ring was visually observed. As a result, the thing which "(circle)" and the Newton ring showed which the Newton ring was not seen was made into "x".

3. Anti-glare

Under the three-wavelength fluorescent lamp, each display element front film was placed on the black background such that the optical functional layer was on the upper surface, and the reflection of the fluorescent lamp was visually evaluated. As a result, it was set as "(circle)" and the thing which was slightly reflected but "△" that the outline of the fluorescent lamp was not reflected.

4. Surface Hardness

Under the three-wavelength fluorescent lamp, the film for each display element was placed on the black background so that the anti-Newton ring layer was on the upper surface, and the steel wool of # 0000 was rubbed once with a load of about 2 cm 2/200 g to visually check for scratches on the surface. . As a result, "(circle)" and "(circle)" which showed few scratches but there was no obstacle were made into "(circle)" that the scratches were hardly seen as "x".

In Examples 1 to 6, the ionizing radiation curable resin and the thermoplastic resin having a glass transition temperature of 45 ° C or more and a weight average molecular weight of 70,000 or more are included in the scope of the present invention as the resin powder in the coating liquid. A mat agent with a modulus of 15% or less is included. As a result, each obtained film for display element front surfaces was excellent in the sparkle prevention property.

In particular, in Examples 1, 3, 5, and 6, the ratio of the ionizing radiation curable resin and the specific thermoplastic resin in the coating liquid is in an optimum range, and the glass transition temperature of the thermoplastic resin is high. As a result, it was confirmed that the obtained films for front surfaces of the display elements were very excellent in sparkle prevention properties.

On the other hand, in Comparative Examples 1 and 2, although the weight ratio of the ionizing radiation curable resin and the thermoplastic resin in the coating liquid is within the scope of the present invention, the glass transition temperature of the used thermoplastic resin is low or the weight average molecular weight is small. Therefore, each obtained display film for front surface of the display element could not prevent sparkle.

In Comparative Examples 3 and 4, the glass transition temperature and the weight average molecular weight of the thermoplastic resin contained in the coating liquid were within the scope of the present invention, but the weight ratio of the thermoplastic resin and the ionizing radiation curable resin was outside the scope of the present invention. Therefore, each obtained film for display element front face was unable to prevent sparkle, or the hardness was extremely inferior.

In Comparative Example 5, the glass transition temperature and the weight average molecular weight of the thermoplastic resin contained in the coating liquid were within the scope of the present invention, and the weight ratio of the thermoplastic resin and the ionizing radiation curable resin was also within the scope of the present invention. A mat agent with a coefficient greater than 15% was used. Therefore, each obtained display film for front surface of the display element could not prevent sparkle.

Claims (15)

In the display element front film arranged on the front of the display element,
It has an optical function layer comprised by the mat agent and the hardened | cured material of the curable composition containing the ionizing radiation curable resin as a resin powder,
The curable composition further comprises one or more of the following (a) and (b) as a resin powder,
The content rate in all resin powder is ionizing radiation curable resin: 50 weight% or more and less than 85 weight%, following (a) and (b): more than 15 weight% and 50 weight% or less,
The matting agent has a coefficient of variation of the particle size distribution of not more than 15%,
The haze (JIS K7136: 2000) in the whole film is 10% or less, The film for front surfaces of a display element characterized by the above-mentioned.
(a) a thermoplastic resin having a weight average molecular weight of 70,000 or more and a glass transition temperature of 45 ° C or more,
(b) Thermosetting resin whose weight average molecular weight is 70,000 or more, and glass transition temperature is 45 degreeC or more. The method of claim 1,
The matting agent is a film for the front surface of the display element, characterized in that the average particle diameter is 0.5 ~ 10 ㎛. The method according to claim 1 or 2,
The optical functional layer is a film for a front surface of a display device, characterized in that the anti-glare layer that exhibits an anti-glare effect or a Newton ring prevention layer that suppresses generation of interference fringes. The method according to claim 1 or 2,
At least one of the thermoplastic resin of the above (a) and the thermosetting resin of the (b), wherein a (meth) acryloyl group is introduced is used. A display element with a surface member in which a surface member is disposed on a display element,
The surface member display device with a surface member comprising at least a portion thereof, the film for front surface of the display device according to claim 1. A display element with a surface member in which a surface member is disposed on a display element,
A display element with a surface member comprising the surface member according to claim 1 or 2, wherein the optical functional layer is used as at least one of an antiglare layer and a Newton ring prevention layer. The method of claim 6,
And the surface member is a protective plate, a touch panel or a polarizing film. The front surface of the display element which has an optical function layer which expresses at least one optical function among anti-glare effect and suppression of interference fringe, and arrange | positions in front of a display element whose haze (JIS K7136: 2000) in the whole film is 10% or less In the curable composition for forming the said optical function layer of the film for films,
Including resin powder and mat,
The resin powder comprises an ionizing radiation curable resin and at least one of the following (a) and (b),
The content rate in all resin powder is ionizing radiation curable resin: 50 weight% or more and less than 85 weight%, following (a) and (b): more than 15 weight% and 50 weight% or less,
The matting agent is a curable composition, characterized in that the coefficient of variation of the particle size distribution is 15% or less.
(a) a thermoplastic resin having a weight average molecular weight of 70,000 or more and a glass transition temperature of 45 ° C or more,
(b) Thermosetting resin whose weight average molecular weight is 70,000 or more, and glass transition temperature is 45 degreeC or more. The method of claim 3, wherein
At least one of the thermoplastic resin of the above (a) and the thermosetting resin of the (b), wherein a (meth) acryloyl group is introduced is used. A display element with a surface member in which a surface member is disposed on a display element,
And said surface member comprises at least a portion thereof, the film for front surface of the display element according to claim 3. A display element with a surface member in which a surface member is disposed on a display element,
The surface element display element with a surface member comprising at least part thereof a film for front surface of the display element according to claim 4. A display element with a surface member in which a surface member is disposed on a display element,
A display element with a surface member comprising the surface member as the film for front surface of the display element according to claim 3, wherein the optical functional layer is used as at least one of an antiglare layer and a Newton ring prevention layer. A display element with a surface member in which a surface member is disposed on a display element,
A display element with a surface member comprising the surface member as the film for front surface of the display element according to claim 4, wherein the optical functional layer is used as at least one of an antiglare layer and a Newton ring prevention layer. The method of claim 12,
And the surface member is a protective plate, a touch panel or a polarizing film. The method of claim 13,
And the surface member is a protective plate, a touch panel or a polarizing film.

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