JP2014088482A - Gelatinous curable resin composition, device for image display and manufacturing method of device for image display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curable resin composition difficult to leak and easy to be formed into a desired shape, and capable of preventing the occurrence of display unevenness because of a low storage elastic modulus of a cured product even when used as a component member of a device for image display.SOLUTION: A gelatinous curable resin composition contains (A) a compound having (meth)acryloyl group, (B) an oil gelling agent and (C) a polymerization initiator, and has a storage elastic modulus at 25°C of 0.01 to 10 kPa.

Description

  The present invention relates to a gel-like curable resin composition, an image display device using the same, and a method for producing an image display device.

  A liquid crystal display device is illustrated as a typical image display device. A liquid crystal display device includes a liquid crystal cell in which liquid crystal is filled and sealed through a gap of about several microns between a glass substrate having a thickness of about 1 mm on which transparent electrodes and pixel patterns are formed, and the liquid crystal cell. The liquid crystal panel which consists of a polarizing plate affixed on both outer sides of this and light sources, such as a backlight system, is included.

  The polarizing plate that makes up this liquid crystal panel is thin and easily scratched. Especially in mobile phones, game consoles, digital cameras, and in-vehicle applications, a transparent front plate (protective panel) with a certain space in front of the liquid crystal panel In general, a liquid crystal display device having a structure provided with a) is used.

  Furthermore, in recent years, touch panels have been mounted on mobile phones, game machines, digital cameras, in-vehicle parts, notebook computers, desktop computers, personal computer monitors, large liquid crystal monitors, and the like. Such a liquid crystal display device has a laminated structure in which a protective panel, a touch panel, and a liquid crystal panel are laminated in this order, and a certain space is provided between the protective panel and the touch panel, and between the touch panel and the liquid crystal panel. Exists.

When only the air is present in the space in the liquid crystal display device described above, this space causes light scattering, resulting in a decrease in contrast, brightness, and transmittance, and a decrease in image quality due to double projection. Can happen.
As a method for preventing such light scattering, Patent Document 1 discloses a method of filling a liquid material in a space between a protective panel and a liquid crystal panel, and Patent Document 2 discloses a method of copolymerizing an acrylic monomer. A method of interposing between a protective panel and a liquid crystal panel has been proposed.

In addition, a plasma display panel (PDP), which is one of flat panel displays (FPD), is provided with a space of about 1 to 5 mm from the PDP to prevent cracking of the PDP, and a protective panel made of glass or the like having a thickness of about 3 mm. Is provided on the front surface (viewing surface side).
As methods for preventing such cracking of the display and light scattering, Patent Documents 3 and 4 disclose a space between a protective panel and an image display unit such as a plasma display panel or a liquid crystal panel, a protective panel and a touch panel. And a space between the touch panel and the image display unit (hereinafter collectively referred to as a “space between the protective panel and the image display unit”).
) Has been proposed in which an optical film made of a specific resin is interposed.

JP 2008-281997 A JP 2004-125868 A JP 2004-058376 A JP 2009-024160 A

However, when the photocurable resin composition is in a liquid state as in Patent Document 1, there is a problem that it is likely to leak from the predetermined portion when formed at the predetermined portion.
On the other hand, there is no problem of leakage when the photocurable resin composition is polymerized into a sheet (solid) as in Patent Documents 2 to 4, but it is sufficient to follow the shape of a predetermined location. There is a problem that a gap or the like is easily generated in the predetermined portion without being deformed.
Further, display irregularities are likely to occur if the storage modulus of the final product is high regardless of the difference in liquid or film form.
The present invention solves the above problems, is difficult to leak out and can be easily molded into a desired shape, and even when used as a component of an image display device, the storage elastic modulus of the cured product is low, resulting in display unevenness. An object of the present invention is to provide a curable resin composition capable of suppressing the above, an image display device using the curable resin composition, and a method for producing the same.

The present inventors further contain an oil gelling agent in addition to the compound having a (meth) acryloyl group and a polymerization initiator as a component of the curable resin composition, and further, this curable resin composition at 25 ° C. It has been found that the above problems can be solved by setting the storage elastic modulus within a predetermined range, and the present invention has been completed.
That is, the present invention provides the following [1] to [12].
[1] A gel curable resin composition comprising (A) a compound having a (meth) acryloyl group, (B) an oil gelling agent, and (C) a polymerization initiator, wherein the storage elastic modulus at 25 ° C. Is a gel-like curable resin composition having a viscosity of 0.01 to 10 kPa.
[2] The gel-like curable resin composition according to [1], further comprising (D) a plasticizer.
[3] The gel-like curable resin composition according to [1] or [2], comprising an isoprene polymer having a (meth) acryloyl group as the component (A).
[4] Gel hardening according to any one of [1] to [3], wherein the content of the component (A) is 10 to 90% by mass with respect to the total amount of the gel curable resin composition. Resin composition.
[5] The component (A) includes (A1) a polymer having an ethylenically unsaturated bond in the molecule, and (A2) a monomer having one ethylenically unsaturated bond in the molecule. ] The gel-like curable resin composition in any one of [4].
[6] The gel curable resin composition according to [5], wherein the content of the component (A2) in the total amount of the gel curable resin composition is 0.5 to 30% by mass.
[7] The gel-like curable resin composition according to any one of [1] to [6], which does not contain an organic solvent and has a viscosity at 25 ° C. of 1 to 100 Pa · s.
[8] The gel-like curable resin composition according to any one of [1] to [7], wherein a storage elastic modulus at 25 ° C. is 0.05 to 5 kPa.
[9] Oil gelling agent (B) is hydroxy fatty acid, n-lauroyl-L-glutamic acid-α, β-dibutyramide, di-p-methylbenzylidene sorbitol glucitol, 1,3: 2,4-bis- O-benzylidene-D-glucitol, 1,3: 2,4-bis-O- (4-methylbenzylidene) -D-sorbitol, bis (2-ethylhexanoato) hydroxyaluminum, and the following general formula (1) to The gel-like curable resin composition according to any one of [1] to [8], which is at least one of the compounds represented by (12).

(In General Formula (1), m is an integer of 3 to 10, n is an integer of 2 to 6, R ₁ is a saturated hydrocarbon group having 1 to 20 carbon atoms, and X is sulfur or oxygen.
In the general formula (2), R ₂ represents a saturated hydrocarbon group having 1 to 20 carbon atoms, Y ₁ is a bond or a benzene ring.
In the general formula (3), R ₃ is a saturated hydrocarbon group having 1 to 20 carbon atoms, and Y ₂ is a bond or a benzene ring.
In the general formula _(4), R 4 is a saturated hydrocarbon group having 1 to 20 carbon atoms.
In General Formula (6), R ₅ and R ₆ are each independently a saturated hydrocarbon group having 1 to 20 carbon atoms.
In the general formula (7), R ₇ is a saturated hydrocarbon group having 1 to 20 carbon atoms.
In general formula (8), R < ₈ > is a C1-C20 saturated hydrocarbon group.
In General Formula (10), R ₉ and R ₁₀ are each independently a saturated hydrocarbon group having 1 to 20 carbon atoms. )

[10] An image display device having a laminated structure including an image display unit having an image display unit, a protection panel, and a resin layer existing between the image display unit and the protection panel, the resin An image display device, wherein the layer is made of a cured product of the gel-like curable resin composition according to any one of [1] to [9].
[11] An image display unit having an image display unit, a touch panel, a protection panel, and a resin layer that is present between at least one of the image display unit and the touch panel and between the touch panel and the protection panel. An image display device having a laminated structure, wherein at least one of the resin layers is made of a cured product of the gel-like curable resin composition according to any one of [1] to [9]. Image display device.
[12] A method for manufacturing an image display device comprising an image display unit and a protection panel, wherein the liquid gel according to any one of [1] to [9] is provided between the image display unit and the protection panel. The gel-like curable resin composition is cured by performing at least one of a step of interposing a glass-like curable resin composition, light irradiation from the protective panel surface side, and heating of the gel-like curable resin composition A method of manufacturing an image display device.
[13] A method for manufacturing an image display device including an image display unit, a touch panel, and a protection panel, and / or between the image display unit and the touch panel and / or between the touch panel and the protection panel, At least one of the step of interposing the gel-like curable resin composition according to any one of 1) to [9], the light irradiation from the protective panel surface side, and the heating of the gel-like curable resin composition And a step of curing the gel-like curable resin composition.

  The gel-like curable resin composition of the present invention is difficult to leak out and can be easily molded into a desired shape, and even when used as a constituent member of an image display device, the cured product has a low storage elastic modulus, so that the display unevenness. Can be suppressed.

It is side surface sectional drawing which shows typically one Embodiment of the liquid crystal display device which is an example of the image display device of this invention. It is side surface sectional drawing which shows typically the liquid crystal display device which mounts the touchscreen which is one Embodiment of the liquid crystal display device which is an example of the image display device of this invention.

Hereinafter, the gel-like curable resin composition of the present invention, the method for producing an image display device using the same, and the image display device will be described in detail by embodiments. In addition, this invention is not limited by this embodiment.
In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.
Further, “(meth) acrylate” in the present specification means one or both of “acrylate” and “methacrylate” corresponding thereto. Similarly, “(meth) acrylamide” means one or both of “acrylamide” and its corresponding “methacrylamide”, and “(meth) acryloyl group” means “acryloyl group” and its corresponding “methacryloyl group”. Or one of both.
In the present specification, the molecular weight is a value measured by gel permeation chromatography (GPC) and converted using a standard polystyrene calibration curve, specifically a value measured by the method described in the examples. is there. Further, the number average molecular weight, the weight average molecular weight, and the degree of dispersion are defined as follows. Here, M _i is the molecular weight, and N _i is the number of moles of the molecule having the molecular weight M _i .
(A) Number average molecular weight (Mn)
Mn = Σ (N _i M _i ) / ΣNi = ΣX _i M _i
(X _i = Mole fraction of molecules with molecular weight M _i = N _i / ΣN _i )
(B) Weight average molecular weight (Mw)
Mw = Σ (N _i M _i ² ) / ΣN _i M _i = ΣW _i M _i
(W _i = weight fraction of molecules of molecular weight M _i = N _i M _i / ΣN _i M _i )
(C) Dispersity (molecular weight distribution)
Dispersity = Mw / Mn

[Gel-like curable resin composition]
The gel-like curable resin composition of the present invention (hereinafter also simply referred to as “resin composition”) includes (A) a compound having a (meth) acryloyl group, (B) an oil gelling agent, and (C) a polymerization initiator. , And a storage elastic modulus at 25 ° C. is 0.01 to 10 kPa. Moreover, it is preferable that the gel-like curable resin composition of this invention contains (D) plasticizer further, and can contain other additives, such as a stabilizer and a thiol compound, as needed.
In the present invention, (A) a compound having a (meth) acryloyl group is referred to as (A) component, (B) an oil gelling agent is referred to as (B) component, and (C) a polymerization initiator is referred to as (C) component. The (D) plasticizer is sometimes referred to as the (D) component.
The gel-like curable resin composition according to the present invention contains (B) an oil gelling agent in addition to (A) a compound having a (meth) acryloyl group and (C) a polymerization initiator. It is hard to leak out compared with the case where it does not contain an agent. Further, the gel-like curable resin composition according to the present invention is gelled by (B) an oil gelling agent, and is not cured into a sheet-like cured product by polymerizing the resin composition. Compared with the case of making it, it can be easily molded into a desired shape. Furthermore, since the gel-like curable resin composition according to the present invention has a storage elastic modulus at 25 ° C. of 0.01 to 10 kPa, it is difficult to leak out and stores a cured product obtained by curing the resin composition. It is also possible to suppress the occurrence of display unevenness by keeping the elastic modulus low.
In addition, the storage elastic modulus at 25 degreeC of a gel-like curable resin composition changes with the kind and content of each component, and increases with the increase in content of (B) oil gelling agent. Therefore, while selecting the kind and content of each component in the gel-like curable resin composition, by adjusting the content of the (B) oil gelling agent, the storage elastic modulus at 25 ° C. is within the scope of the present invention. Can be inside.
In the gel-like curable resin composition according to the present invention, the “gel-like” is a material that has a high viscosity due to a dispersoid network and loses fluidity, and the entire system becomes solid. Is preferably a physical gel at a room temperature of 25 ° C.
Next, each component will be described.

[(A) component: a compound having a (meth) acryloyl group]
The resin composition of the present invention contains a compound having a (meth) acryloyl group as the component (A).
The content of the component (A) is preferably 10 to 90 with respect to the total amount of the resin composition from the viewpoint of improving the curability of the cured product obtained by curing the resin composition and expressing the effects of other components. It is 20 mass%, More preferably, it is 20-70 mass%, More preferably, it is 30-60 mass%.

Examples of the compound having a (meth) acryloyl group include a polymer having an ethylenically unsaturated bond in the molecule (hereinafter also referred to as “component (A1)”) and a single compound having one ethylenically unsaturated group in the molecule. Examples include at least one monomer (hereinafter also referred to as “component (A2)”). From the viewpoint of adjusting the viscosity of the resin composition, it is preferable to use the component (A1) and the component (A2) in combination.
Hereinafter, the component (A1) and the component (A2) will be described.

<(A1) component: a polymer having an ethylenically unsaturated bond in the molecule>
Examples of the polymer having an ethylenically unsaturated bond in the molecule as the component (A1) include a polyester oligomer having a (meth) acryloyl group, a urethane polymer having a (meth) acryloyl group, and a polyethylene glycol mono (meth). At least of acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol mono (meth) acrylate, polypropylene glycol di (meth) acrylate, butadiene polymer having (meth) acryloyl group, and isoprene polymer having (meth) acryloyl group One type is mentioned.
Among these, an isoprene polymer having a (meth) acryloyl group is preferable from the viewpoint of transparency, yellowing resistance, and balance of various properties.

  As the isoprene polymer having a (meth) acryloyl group, for example, a compound represented by the following general formula (13) is preferable.

In the general formula (13), p is a number of 50 to 1000, q is a number of 1 to 5, R ¹¹ represents a hydrogen atom or a methyl group.
Although p is 50-1000, Preferably it is 100-800, More preferably, it is 150-700, More preferably, it is 200-600.
Although q is 1-5, Preferably it is 1.5-4.0, More preferably, it is 2.0-3.5, More preferably, it is 2.0-3.0.
Examples of commercially available compounds represented by the general formula (13) include UC-102 and UC-203 (both product names, manufactured by Kuraray Co., Ltd.).

The average functional group number in the component (A1) is preferably 1.5 to 4.0, more preferably 2.0 to 3.5, from the viewpoint of further reducing the curing shrinkage and the elastic modulus of the curable resin composition. More preferably, it is 2.0-3.0.
The “functional group number” indicates the number of functional groups ((meth) acryloyl group) in one molecule of the component (A1), and the “average functional group number” indicates the number of functional groups per molecule in the entire component (A1). The average value is shown.

  The number average molecular weight (Mn) of the component (A1) is preferably 10,000 to 40000, more preferably 12,500 to 30000, and still more preferably 15000, from the viewpoints of viscosity after blending, workability, toughness of the cured product, and elastic modulus. 20000.

The content of the component (A1) in the resin composition is preferably 10 to 55% by mass, more preferably 15 to 50%, based on the total amount of the resin composition, from the viewpoints of curability, curing shrinkage, and elastic modulus. It is 20 mass%, More preferably, it is 20-45 mass%.
If content of (A1) component is 10 mass% or more, while being able to improve the sclerosis | hardenability of a resin composition, the wet heat-resistance reliability of hardened | cured material can be made favorable. On the other hand, when the content of the component (A1) is 55% by mass or less, the curing shrinkage rate is good and the elastic modulus of the cured product is not excessively increased, which is preferable.

<(A2) component: monomer having one ethylenically unsaturated group in the molecule>
The monomer having one ethylenically unsaturated group in the molecule as the component (A2) is preferably a liquid at normal temperature (25 ° C.), and is an alkyl represented by the following general formula (3) ( (Meth) acrylate (hereinafter also referred to as “(A2-1) component”), and a compound having a (meth) acryloyl group in the molecule and having at least one of a hydroxyl group, an ether bond and an amide group (hereinafter, “ One or both of (also referred to as “component (A2-2)” is more preferable, and component (A2-2) is more preferable.

In the general formula (14), R ²¹ represents a hydrogen atom or a methyl group, and R ²² represents an alkyl group having 4 to 20 carbon atoms. From the viewpoint of imparting more flexibility, R ²² is preferably an alkyl group having 6 to 18 carbon atoms, and more preferably an alkyl group having 8 to 16 carbon atoms.

<(A2-1) component>
Examples of the alkyl (meth) acrylate represented by the general formula (14) include n-butyl (meth) acrylate, tert-butyl (meth) acrylate, isobutyl (meth) acrylate, n-pentyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, n-hexyl (meth) acrylate, stearyl (meth) acrylate, lauryl (meth) acrylate, tridecyl ( And (meth) acrylate. These compounds may be used alone or in combination of two or more.

<(A2-2) component>
Examples of the compound having a (meth) acryloyl group in the molecule and having at least one of a hydroxyl group, an ether bond and an amide group include 2-hydroxyethyl (meth) acrylate, 1-hydroxyethyl (meth) acrylate, 2 -Hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 1-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 2-hydroxybutyl (meta ) Hydroxyl group-containing (meth) acrylates such as acrylate and 1-hydroxybutyl (meth) acrylate; Hydroxyl group-containing (meth) acrylamides such as hydroxyethyl (meth) acrylamide; Polyethylene such as diethylene glycol and triethylene glycol Tylene glycol mono (meth) acrylate; polypropylene glycol mono (meth) acrylates such as dipropylene glycol and tripropylene glycol; polybutylene glycol mono (meth) acrylates such as dibutylene glycol and tributylene glycol; morpholine groups such as acryloylmorpholine (Meth) acrylates; (meth) acrylamides such as dimethylacrylamide, isopropylacrylamide, dimethylaminopropylacrylamide, hydroxyethylacrylamide (isobornyl acrylate); ether bond-containing (meth) acrylates such as dicyclopentenyloxyethyl acrylate .
These compounds may be used alone or in combination of two or more.
Among these, dicyclopentenyloxyethyl acrylate is preferable from the viewpoints of transparency and self-organization.

The content of the component (A2) in the resin composition is the total amount of the resin composition from the viewpoint of obtaining a resin composition having an appropriate viscosity, and from the viewpoint of adjusting the curing shrinkage rate and the elastic modulus of the cured product. On the other hand, Preferably it is 0.5-30 mass%, More preferably, it is 5-30 mass%, More preferably, it is 10-25 mass%, More preferably, it is 15-25 mass%.
If the content of the component (A2) is 0.5% by mass or more, a resin composition having an appropriate viscosity can be obtained, workability at the time of application can be improved, and the curing shrinkage rate can be increased. Can be lowered. Moreover, while being able to make favorable the sclerosis | hardenability in the light-shielding part of the resin composition obtained, transparency of hardened | cured material can be improved.
If content of (A2) component is 30 mass% or less, it can suppress that a cure shrinkage rate and an elasticity modulus become high too much, and when it uses for the apparatus for image displays, generation | occurrence | production of display nonuniformity is suppressed. be able to.
<(B) component: oil gelling agent>
Examples of the (B) oil gelling agent (hereinafter sometimes referred to as “component (B)”) include hydroxystearic acid, particularly hydroxy fatty acids such as 12-hydroxystearic acid, n-lauroyl-L-glutamic acid-α, β. -Dibutylamide, di-p-methylbenzylidene sorbitol glucitol, 1,3: 2,4-bis-O-benzylidene-D-glucitol, 1,3: 2,4-bis-O- (4-methylbenzylidene ) -D-sorbitol, bis (2-ethylhexanoato) hydroxyaluminum, compounds represented by the following general formulas (1) to (12), and the like. These may be used alone or in combination of two or more. Among these, at least one of 12-hydroxystearic acid and n-lauroyl-L-glutamic acid-α, β-dibutyramide is more preferable.

In general formula (1), m is an integer of 3 to 10, n is an integer of 2 to 6, R ₁ is a saturated hydrocarbon group having 1 to 20 carbon atoms, and X is sulfur or oxygen.
In the general formula (2), R ₂ represents a saturated hydrocarbon group having 1 to 20 carbon atoms, Y ₁ is a bond or a benzene ring.
In the general formula (3), R ₃ is a saturated hydrocarbon group having 1 to 20 carbon atoms, and Y ₂ is a bond or a benzene ring.
In the general formula _(4), R 4 is a saturated hydrocarbon group having 1 to 20 carbon atoms.
In General Formula (6), R ₅ and R ₆ are each independently a saturated hydrocarbon group having 1 to 20 carbon atoms.
In the general formula (7), R ₇ is a saturated hydrocarbon group having 1 to 20 carbon atoms.
In general formula (8), R < ₈ > is a C1-C20 saturated hydrocarbon group.
In General Formula (10), R ₉ and R ₁₀ are each independently a saturated hydrocarbon group having 1 to 20 carbon atoms.
The content of the oil gelling agent (B) is preferably 0.1 to 20% by mass with respect to the total amount of the resin composition. When it is 0.1% by mass or more, it can be sufficiently gelled,
When the content is 20% by mass or less, the content of the compound (A) having a photopolymerizable functional group is relatively increased, so that it can be sufficiently photocured. In this respect, the content is more preferably 0.2 to 15% by mass, further preferably 0.3 to 10% by mass, further preferably 0.3 to 5% by mass, and 0.3 to 2% by mass. Is more preferable, and 0.3-1 mass% is still more preferable.

<(C) component: polymerization initiator>
The polymerization initiator (C) is a kind of polymerization initiator that generates radicals by irradiation with active energy rays such as ultraviolet rays, electron beams, α rays, β rays, and accelerates the curing reaction of the resin composition. Is preferred.
Examples of the polymerization initiator (C) include 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, and 1- [4- (2-hydroxyethoxy). Α-hydroxyalkylphenone compounds such as -phenyl] -2-hydroxy-2-methyl-1-propan-1-one; acetophenone compounds such as 2,2-dimethoxy-2-phenylacetophenone; bis (2,4 , 6-trimethylbenzoyl) -phenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, etc. And acylphosphine oxide compounds. Among these, 1-hydroxycyclohexyl phenyl ketone or 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is particularly preferable.

In this invention, it is preferable that content of (C) component is 0.1-5.0 mass% with respect to the total amount of a resin composition. When the content of the component (C) is 0.1% by mass or more, the curing reaction can be sufficiently promoted to obtain a cured product. On the other hand, when the content of the component (C) is 5.0% by mass or less, high temperature and high humidity reliability is high, which is preferable.
Although content of (C) component is 0.1-5.0 mass% with respect to the total amount of a resin composition, Preferably it is 0.2-3.0 mass% from the said viewpoint, More preferably It is 0.25 to 2.5 mass%, more preferably 0.3 to 2.0 mass%.

In the present invention, as the component (C), it is preferable to use a photopolymerization initiator that generates radicals by irradiation with the active energy ray. However, with the photopolymerization initiator or in place of the photopolymerization initiator, A thermal polymerization initiator that generates radicals may be used.
Examples of the thermal polymerization initiator include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, and di (2-ethoxyethyl) peroxy. Dicarbonate, t-butyl peroxyneodecanoate, t-butyl peroxybivalate, t-hexyl peroxypivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, lauroyl peroxide Organic peroxides such as diacetyl peroxide; 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane-1-carbonyl) ), 2,2′-azobis (2,4-dimethylvaleronitrile) ), 2,2′-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2′-azobis (2-methylpropionate), 4,4′-azobis (4-cyanovaleric) Acid), 2,2′-azobis (2-hydroxymethylpropionitrile), 2,2′-azobis [2- (2-imidazolin-2-yl) propane], and the like.

  When mix | blending a thermal polymerization initiator, Preferably content of the said thermal polymerization initiator is 0.01-1 mass% with respect to the total amount of a resin composition.

<(D) component: Plasticizer>
The resin composition of the present invention may contain a plasticizer as the component (D).
The plasticizer used as the component (D) in the present invention means that it is a component that is liquid at 25 ° C. and has substantially no (meth) acryloyl group.
The number average molecular weight of the component (D) is preferably 350 to 30000, more preferably 400 to 10000, from the viewpoint of adjusting the viscosity of the resin composition, and from the viewpoints of volatility and workability.

Examples of the component (D) include butadiene rubber, isoprene rubber, silicon rubber, styrene butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, ethylene propylene rubber, urethane rubber, acrylic rubber, chlorosulfonated polyethylene rubber, fluorine rubber, hydrogen. Nitrile rubber, epichlorohydrin rubber liquid;
Poly α-olefins such as polybutene, hydrogenated α-olefin oligomers such as hydrogenated polybutene, polyvinyl oligomers such as atactic polypropylene;
Aromatic oligomers such as biphenyl and triphenyl;
Hydrogenated polyene oligomers such as hydrogenated liquid polybutadiene;
Paraffinic oligomers such as paraffin oil and chlorinated paraffin oil;
Cycloparaffinic oligomers such as naphthenic oil;
Dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di- (2-ethylhexyl) phthalate, di-n-octyl phthalate, diisobutyl phthalate, diheptyl phthalate, diphenyl phthalate, diisodecyl phthalate, ditridecyl phthalate, diundecyl phthalate, di (heptyl, Nonyl, undecyl) phthalate, benzyl phthalate, butyl benzyl phthalate, dinonyl phthalate, dicyclohexyl phthalate, and other phthalic acid derivatives;
Isophthalic acid derivatives such as dimethyl isophthalate, di- (2-ethylhexyl) isophthalate, diisooctyl isophthalate;
Tetrahydrophthalic acid derivatives such as di- (2-ethylhexyl) tetrahydrophthalate, di-n-octyltetrahydrophthalate, diisodecyltetrahydrophthalate;
Adipic acid derivatives such as di-n-butyl adipate, di (2-ethylhexyl) adipate, diisodecyl adipate, diisononyl adipate;
Azelaic acid derivatives such as di- (2-ethylhexyl) azelate, diisooctylazelate, di-n-hexylazelate;
Sebacic acid derivatives such as di-n-butyl sebacate and di- (2-ethylhexyl) sebacate;
Maleic acid derivatives such as di-n-butyl maleate, dimethyl maleate, diethyl maleate, di- (2-ethylhexyl) maleate;
Fumaric acid derivatives such as di-n-butyl fumarate and di- (2-ethylhexyl) fumarate;
Tri- (2-ethylhexyl) trimellitate, tri-n-octyl trimellitate, triisodecyl trimellitate, triisooctyl trimellitate, tri-n-hexyl trimellitate, triisononyl trimellitate, etc. Merit acid derivatives;
Pyromellitic acid derivatives such as tetra- (2-ethylhexyl) pyromellitate and tetra-n-octylpyromellitate;
Citric acid derivatives such as triethyl citrate, tri-n-butyl citrate, acetyl triethyl citrate, acetyl tri- (2-ethylhexyl) citrate;
Itaconic acid derivatives such as monomethyl itaconate, monobutyl itaconate, dimethyl itaconate, diethyl itaconate, dibutyl itaconate, di- (2-ethylhexyl) itaconate;
Oleic acid derivatives such as butyl oleate, glyceryl monooleate, diethylene glycol monooleate;
Ricinoleic acid derivatives such as methylacetylricinoleate, butylacetylricinoleate, glycerylmonoricinoleate, diethylene glycol monoricinoleate;
stearic acid derivatives such as n-butyl stearate, glycerin monostearate, diethylene glycol distearate;
Other fatty acid derivatives such as diethylene glycol monolaurate, diethylene glycol dipelargonate, pentaerythritol fatty acid ester;
Phosphate derivatives such as triethyl phosphate, tributyl phosphate, tri- (2-ethylhexyl) phosphate, tributoxyethyl phosphate, triphenyl phosphate, cresyl diphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, tris (chloroethyl) phosphate;
Diethylene glycol dibenzoate, dipropylene glycol dibenzoate, triethylene glycol dibenzoate, triethylene glycol di- (2-ethylbutyrate), triethylene glycol di- (2-ethylhexoate), dibutylmethylene bisthioglycolate, etc. A glycol derivative of
Examples include glycerin derivatives such as glycerol monoacetate, glycerol triacetate, and glycerol tributyrate; .
These compounds can be used alone or in combination of two or more.

  Among these, when an isoprene polymer containing a (meth) acryloyl group is used as the component (A1), butadiene rubber and isoprene rubber are used from the viewpoints of volatility, viscosity, workability, yellowing resistance, compatibility, and heat resistance. , Poly α-olefin, hydrogenated α-olefin oligomer, and di- (2-ethylhexyl) sebacate are preferable, butadiene rubber, poly α-olefin, and di- (2-ethylhexyl) sebacate are more preferable, and butadiene rubber is more preferable.

  The content of the component (D) is preferably 30 to 85% by mass, more preferably 40 to 70% by mass, based on the total amount of the resin composition, from the viewpoint of adjusting the elastic force of the cured product to an appropriate range. More preferably, it is 45-65 mass%.

<Other additives>
The resin composition of the present invention can further contain other additives as long as the effects of the present invention are not impaired.
Other additives include stabilizers such as triphenyl phosphite, 1,4-bis (3-mercaptobutyryloxy) butane, 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3 , 5-triazine-2,4,6 (1H, 3H, 5H) -trione, thiol compounds such as pentaerythritol tetrakis (3-mercaptobutyrate), and the like.

It is preferable that the resin composition of this invention does not contain an organic solvent (solvent) from a viewpoint of heat-and-moisture resistance reliability and the suppression of the bubble generation in hardened | cured material.
Here, “substantially does not contain an organic solvent” means that no organic solvent is intentionally added, and a trace amount of the resin composition of the present invention is not significantly reduced after curing. An organic solvent may be present.
Specifically, the content of the organic solvent in the resin composition may be 1000 ppm or less, preferably 500 ppm or less, more preferably 100 ppm or less, and still more preferably an organic solvent with respect to the total amount of the resin composition. Does not contain at all.
In the present invention, the “organic solvent” means an organic compound that does not have a (meth) acryloyl group, is liquid at 25 ° C., and has a boiling point of 250 ° C. or less at atmospheric pressure.
In the resin composition of the present invention, the total amount of the components (A) to (D) in the resin composition is preferably 80% by mass or more, more preferably 90% by mass or more, and still more preferably. It is 95 mass% or more, More preferably, it is 99 mass% or more, More preferably, it is 100 mass%.

[Physical properties of resin composition]
The gel-like curable resin composition according to the present invention has a storage elastic modulus at 25 ° C. of 0.01 to 10 kPa. Thereby, it is hard to leak out and the storage elastic modulus of the hardened | cured material which hardens the said resin composition can be suppressed low, and generation | occurrence | production of a display nonuniformity can be suppressed. From this viewpoint, the storage elastic modulus at 25 ° C. is preferably 0.05 to 5 kPa, more preferably 0.08 to 5 kPa, still more preferably 0.1 to 5 kPa, and still more preferably 0.00. 5-4 kPa.
In addition, the storage elastic modulus at 25 degreeC can be measured by the method as described in an Example.

The viscosity at 25 ° C. of the resin composition of the present invention is preferably 1 to 100 Pa · s, more preferably 3 to 80 Pa · s, and still more preferably 5 to 70 Pa · s, from the viewpoint of suppression of bleeding out and workability. is there.
The viscosity at 25 ° C. here is a value measured based on JIS Z 8803, and specifically means a value measured by a B-type viscometer (manufactured by Toki Sangyo, BL2).
The calibration of the viscometer can be performed based on JIS Z 8809-JS14000.

[Physical properties of cured product of resin composition]
The curing shrinkage rate of the resin composition of the present invention is preferably 3.0 from the viewpoint of further suppressing the warpage of the substrate such as a protective panel or an image display unit when used as a constituent member of an image display device. %, More preferably less than 1.5%. When the curing shrinkage rate is less than 3.0%, it is possible to sufficiently suppress the warpage of the substrate, which may cause display unevenness.

The storage elastic modulus at 25 ° C. of the cured product of the resin composition of the present invention suppresses local stress applied to the image display unit or the like when used as a constituent member of an image display device, and causes display unevenness. From the viewpoint of suppressing the above, it is preferably 50 kPa or less, more preferably 40 kPa or less, still more preferably 30 kPa or less, and particularly preferably 27 kPa or less. If the elastic modulus is less than 50 kPa, it is possible to suppress local stress application to the image display unit, which may cause display unevenness.
In addition, the storage elastic modulus at 25 ° C. of the cured product of the resin composition of the present invention is limited to the lower limit of the elastic modulus as long as the liquid material is not separated from the cured product or does not sag when heated. However, it is preferably 1 kPa or more, more preferably 1.5 kPa or more, still more preferably 2 kPa or more, and particularly preferably 3 kPa or more.
In addition, the storage elastic modulus at 25 degreeC can be measured by the method as described in an Example.

[Image display device]
Hereinafter, a liquid crystal display device which is an example of an image display device that can be manufactured using the resin composition of the present invention will be described.
FIG. 1 is a side sectional view schematically showing an embodiment of a liquid crystal display device which is an example of an image display device of the present invention. The liquid crystal display device shown in FIG. 1 includes an image display unit 1 in which a backlight system 50, a polarizing plate 22, a liquid crystal display cell 10, and a polarizing plate 20 are laminated in this order, and a polarizing plate on the viewing side of the liquid crystal display device. The transparent resin layer 32 provided on the upper surface of 20 and the transparent protective substrate (protective panel) 40 provided on the surface thereof. In addition, the transparent resin layer 32 is comprised from the hardening body of the resin composition of this invention.

  FIG. 2 is a side cross-sectional view schematically showing a liquid crystal display device equipped with a touch panel, which is an embodiment of a liquid crystal display device which is an example of the image display device of the present invention. The liquid crystal display device shown in FIG. 2 includes an image display unit 1 in which a backlight system 50, a polarizing plate 22, a liquid crystal display cell 10, and a polarizing plate 20 are laminated in this order, and a polarizing plate on the viewing side of the liquid crystal display device. 20, a transparent resin layer 32 provided on the top surface, a touch panel 30 provided on the top surface of the transparent resin layer 32, a transparent resin layer 31 provided on the top surface of the touch panel 30, and a transparent protective substrate provided on the surface thereof 40.

  In the liquid crystal display device of FIG. 2, a transparent resin layer is interposed between the image display unit 1 and the touch panel 30 and between the touch panel 30 and the transparent protective substrate 40. It suffices to intervene in at least one of these. When the touch panel is on-cell, the touch panel and the liquid crystal display cell are integrated. As a specific example, the liquid crystal display cell 10 of the liquid crystal display device of FIG. 1 may be replaced with an on-cell.

  Since the liquid crystal display device shown in FIGS. 1 and 2 includes the cured product of the resin composition of the present invention as the transparent resin layer 31 or 32, the storage elastic modulus of the transparent resin layer 31 or 32 is lowered, and display unevenness is caused. Occurrence is suppressed.

  The liquid crystal display cell 10 can be made of a liquid crystal material well known in the art. Further, according to the control method of the liquid crystal material, it is classified into a TN (Twisted Nematic) method, a STN (Super-twisted nematic) method, a VA (Virtual Alignment) method, an IPS (In-Place-Switching) method, etc. Then, it may be a liquid crystal display cell using any control method.

As the polarizing plates 20 and 22, a polarizing plate common in this technical field can be used.
The surface of the polarizing plate may be subjected to treatments such as antireflection, antifouling, and hard coat. Such surface treatment may be performed on one side of the polarizing plate or on both sides thereof.
Moreover, as the touch panel 30, what is generally used in this technical field can be used.

  The transparent resin layer 31 or 32 can be formed with a thickness of 0.02 mm to 3 mm, for example. In particular, the resin composition of the present invention is easy to form a thick film, and is suitable for forming the transparent resin layer 31 or 32 of 0.1 mm or more.

As the transparent protective substrate 40, a general optical transparent substrate can be used.
Examples of the transparent protective substrate include inorganic plates such as glass plates and quartz plates, resin plates such as acrylic plates and polycarbonate plates, and resin sheets such as thick polyester sheets.
Among these, when high surface hardness is required, a glass plate and an acrylic plate are preferable, and a glass plate is more preferable.
The surface of the transparent protective substrate 40 may be subjected to treatments such as antireflection, antifouling, and hard coat. Such surface treatment may be performed on one side of the transparent protective substrate or on both sides. Further, the transparent protective substrate can be used in combination of a plurality of substrates.

  Although there is no restriction | limiting in particular in the structure as the backlight system 50, Generally, it is comprised from illumination means, such as reflection means, such as a reflecting plate, and a lamp. As these reflecting means and illuminating means, well-known means / configuration applied in a normal image display device can be applied.

[Method for Manufacturing Image Display Device]
The image display apparatus as shown in FIGS. 1 and 2 using the resin composition of the present invention can be manufactured by the following method.
First, an image display device including an image display unit and a protection panel as shown in FIG. 1 is a step of interposing the resin composition of the present invention between the image display unit and the protection panel ( Hereinafter, the resin composition is cured by performing at least one of “irradiation from the protective panel surface side” and “heating of the gel-like curable resin composition” and “transparent resin” (also referred to as “step (1a)”). It can be manufactured through a step of forming a layer (hereinafter also referred to as “step (2a)”).

  Further, the image display device including the image display unit, the touch panel, and the protection panel as shown in FIG. 2 is provided between the image display unit and the touch panel and / or between the touch panel and the protection panel. Between the step of interposing the resin composition of the present invention (hereinafter also referred to as “step (1b)”), at least one of light irradiation from the protective panel surface side and heating of the gel-like curable resin composition By carrying out, it can manufacture through the process (henceforth "process (2b)") which hardens a resin composition and forms a transparent resin layer.

In the steps (1a) and (1b), as a method of interposing the resin composition of the present invention between the image display unit and the protection panel, for example, using a dispenser, the image display unit or the protection panel is placed on the image display unit or the protection panel. After applying the resin composition, the resin composition is cast between a method of bonding at a vacuum (reduced pressure) or atmospheric pressure, or between an image display unit and a protection panel arranged at a certain interval. Methods and the like.
In addition, when casting the resin composition of this invention, you may form a dam around an image display unit and a protection panel.

The light irradiation in the steps (2a) and (2b) is performed by irradiating active energy rays such as ultraviolet rays, electron beams, α rays, β rays, etc., and can be performed using, for example, an ultraviolet irradiation device. In addition, the resin composition of this invention can fully advance hardening reaction, for example, even if exposure amount is as small as 50 mJ / cm < ² >. Therefore, if the exposure amount is 50 mJ / cm ² or more, the curing reaction can be sufficiently advanced to obtain a cured product. In addition, it is preferable that the upper limit of exposure amount shall be 5000 mJ / cm < ² > or less.
The exposure amount refers to a value obtained by multiplying the illuminance measured by an ultraviolet irradiation device (manufactured by Oak Co., Ltd., product name “UV-M02 (receiver: UV-36)”), etc., with the irradiation time (seconds). .
Examples of the light source for ultraviolet irradiation include a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, a metal halide lamp, and an LED lamp. Among these, a high pressure mercury lamp and a metal halide lamp are preferable.
In the case of light irradiation, irradiation from the protective panel surface side and irradiation from the side surface may be used in combination. Moreover, hardening can also be accelerated | stimulated by heating the laminated body containing a resin composition simultaneously with light irradiation.

As described above, the liquid crystal display device which is one of the image display devices that can be manufactured by using the resin composition of the present invention has been described. However, the liquid crystal display device is manufactured by using the resin composition of the present invention. However, the image display device that can do this is not limited to this.
For example, the present invention can be applied to a plasma display (PDP), a cathode ray tube (CRT), a field emission display (FED), an organic EL display, a 3D display, electronic paper, and the like.
In particular, when the image display device is 10 inches or larger, it is more preferable to produce a transparent resin layer using the resin composition of the present invention.

EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example.
Moreover, the number average molecular weight (Mn) of the compound used in the following examples is a value measured based on the following method.
[Method of measuring number average molecular weight (Mn)]
The determination was carried out using gel permeation chromatography (GPC) using tetrahydrofuran (THF) as a solvent, and a calibration curve was prepared using polystyrene as a standard substance.
In preparing the calibration curve, 5 sample sets (PStQuickMP-H, PStQuick B [trade name, manufactured by Tosoh Corporation]) were used as standard polystyrene.
Apparatus: High-speed GPC apparatus HCL-8320GPC (detector: differential refractometer or UV)
(Product name, manufactured by Tosoh Corporation)
Solvent: Tetrahydrofuran (THF)
Column: Column TSKGEL SuperMultipore HZ-H
(Product name, manufactured by Tosoh Corporation)
Column size: Column length is 15 cm, column inner diameter is 4.6 mm
Measurement temperature: 40 ° C
Flow rate: 0.35 ml / min Sample concentration: 10 mg / THF 5 ml
Injection volume: 20 μl

[Examples 1 to 9 and Comparative Example 1]
The components (A) to (D) were blended at the blending ratio shown in Table 1, and the gel-like curable resin compositions of Examples 1 to 8 and Comparative Example 1 were prepared by stirring and mixing at 90 ° C. for 30 minutes. did. In Table 1, the units of numerical values for the components (A) to (D) are parts by mass.
In addition, the detail of (A)-(D) component among each component shown in Table 1 is as follows.

Component (A) “Isoprene methacrylate”: manufactured by Kuraray Co., Ltd., product name “UC-102”. It has a structure represented by the above general formula (2), R ¹ is a methyl group, n = 2 (number of methacryloyl groups = 2), Mn = 17000.
・ "Cycloaliphatic acrylate": dicyclopentenyloxyethyl acrylate, manufactured by Hitachi Chemical Co., Ltd., product name "FA-512A"
Component (B): HSA: 12-hydroxystearic acid, manufactured by Wako Pure Chemical Industries, Ltd. GBR: n-lauroyl-L-glutamic acid-α, β-dibutylamide, manufactured by Wako Pure Chemical Industries, Ltd. (C) Component: i- 184: 1-Hydroxycyclohexyl phenyl ketone, manufactured by Ciba-Geigy, Japan → Company name has been changed. Please modify it to BASF Japan.
-TPO: 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, manufactured by Ciba Japan Co., Ltd. → Change to the following. Product name SPEDCURE TPO, manufactured by LAMBSON
Component (D) · LBR-307: butadiene rubber, manufactured by Kuraray Co., Ltd., number average molecular weight (Mn) = 8000
Polyvest 110: Butadiene rubber, manufactured by Evonik Degussa Japan, Mn = 2900

  The test shown below was done about the resin composition obtained by each Example and each comparative example, and its hardened | cured material, and each characteristic was evaluated. The results are shown in Table 1.

(1) Evaluation of self-organization property A gel-like curable resin composition is added to a 2 ml screw tube, and an oil gelling agent is used in an oven at 100 ° C. (air blowing thermostat DN-400, manufactured by Yamato Scientific Co., Ltd.). Allowed to dissolve. Next, the solution was quickly homogenized with a self-revolving mixer ARE-250 (manufactured by THINKY) under the conditions of 2000 rpm for 20 seconds and left at 25 ° C. for 30 minutes. Thereafter, the screw tube was tilted about 60 degrees and left for 3 minutes to evaluate self-organization.
(Evaluation criteria)
4: The resin composition does not flow and maintains its shape 3: The whole resin composition maintains a gel state, but has a little fluidity 2: The resin composition separates into a gel state and a liquid state 1: All resin compositions are liquid and fluid

(2) Transparency evaluation 2 g of the resin composition was added to a 2 ml screw tube and allowed to stand until the oil gelling agent was dissolved in an oven at 100 ° C. (fan constant temperature thermostat DN-400, manufactured by Yamato Scientific Co., Ltd.). . Next, the solution was quickly homogenized with a self-revolving mixer ARE-250 (manufactured by THINKY) under the conditions of 2000 rpm for 20 seconds and left at 25 ° C. for 30 minutes. The transparency of the contents of the screw tube was evaluated.
(Evaluation criteria)
4: No turbidity is seen even after seeing through the fluorescent lamp 3: It turns out that it is turbid when seen through the fluorescent lamp 2: It is slightly turbid 1: It is cloudy enough that the opposite side is not clearly visible when viewed from the observation side Have

(3) Viscosity of gel-like curable resin composition Using E-type viscometer (TV-22 manufactured by Toki Sangyo Co., Ltd.) Viscosity (unit: 25 ° C) of the resin composition obtained in each Example and each Comparative Example : Pa · s). Measurement conditions and methods are as shown below.
(Measurement condition)
・ Rotor name: 3 ° × R9.7, Rotor code 06
・ Measurement range: 5M
・ Rotation speed: 0.5rpm
(Measuring method)
The sample heated to 80 ° C. was placed in a measurement container and left at 25 ° C. for 10 minutes. Thereafter, rotation was started, and the value after 3 minutes was taken as the viscosity.

(4) Storage modulus of gel curable resin composition and cured product Gel curable resin composition obtained in each example and each comparative example using a rheometer (manufactured by Anton Paar Co., Ltd., MCR301) The storage elastic modulus (unit: kPa) at 25 ° C. of the cured product obtained by curing the gel-like curable resin composition by irradiating the product and ultraviolet rays with an exposure amount of 2000 mJ / cm ² was measured. Measurement conditions and methods are shown below.
(Sample adjustment conditions)
The gel-like curable resin composition was heated to 80 ° C. to obtain a fluid state, and about 0.5 ml of this was collected with a dropper and applied onto a glass plate (diameter 50 mm, thickness 5 mm). Next, jig PP-12 (parallel plate, diameter 12 mm) was set on the applied gel-like curable resin composition so that the thickness of the gel-like curable resin composition was 150 μm. After wiping off the protruding gel curable resin composition, a scattering prevention cover (H-PTD200) was set. In this state, the temperature was set to 20 ° C.
(Measurement conditions for gel-like curable resin composition)
As vibration conditions, the strain was set to 5%, and the frequency at that time was set to 1 Hz. The measurement was started after standing for 60 minutes. The temperature was increased to 100 ° C. at a rate of temperature increase of 2 ° C./min. The storage elastic modulus at 25 ° C. of the obtained data was read and used as the storage elastic modulus of the gel-like curable resin composition.
(Storage modulus of cured product)
The same operation as the above sample adjustment conditions was performed, and the mixture was allowed to stand for 60 minutes. As vibration conditions, the 5% strain, by setting the frequency at that time to 1 Hz, is vibrated for 30 seconds at 20 ° C., irradiation with ultraviolet light exposure amount 2000 mJ / cm ² from the lower side of the glass plate while vibrating thereafter 20 ° C. Then, it was photocured and then vibrated again at 20 ° C. for 30 seconds. Subsequently, the temperature was increased to 100 ° C. at a rate of temperature increase of 2 ° C./min. The storage elastic modulus at 25 ° C. of the obtained data was read and used as the storage elastic modulus of the cured product.
(Measuring method)
A sample heated to 80 ° C. was placed on a sample stage, set to a thickness of 150 μm, covered, left at 20 ° C. for 60 minutes, and heated to 100 ° C. at a rate of 2 ° C./min. The storage elastic modulus at 25 ° C. at that time was taken as a measured value.

(5) Step embedding evaluation 58 mm × 86 mm × 0.7 mm (thickness) by printing in a frame shape so that the thickness becomes 60 μm along the outer peripheral portion of the surface of the glass substrate A. A glass substrate B (step difference: 60 μm) having a stepped portion formed on the surface was prepared. In addition, the frame-shaped printing part of this glass plate B has the same outer dimension as the glass substrates A and B, and has an opening part with an inner dimension of 45 mm x 68 mm.
A gel-like curable resin composition sealed in a 5 ml syringe was applied to the surface of the glass substrate A.
Next, the surface of the glass substrate A having the stepped portion of the glass plate B faces the coating surface of the gel-like curable resin composition, and the gel-like curable resin composition is sandwiched between the glass plates A and B. As described above, bonding was performed using a bonding machine.
The glass substrate was used as a substitute for an information input device or an image display unit, and the embedding property was evaluated.
(Evaluation criteria)
A: The resin composition can be embedded in the step portion without gaps and without leakage. B: The resin composition flows out from the glass substrate to the periphery.

Since the gel-like curable resin compositions of Examples 1 to 9 have an appropriate viscosity and storage elastic modulus, they are difficult to leak out and can be easily formed into a desired shape, and are used as constituent members of an image display device. Even in such a case, it is considered that the occurrence of display unevenness can be suppressed because the storage modulus of the cured product is low.
On the other hand, the gel-like curable resin composition of Comparative Example 1 could not be evaluated because it could not be gelled.

  Since the gel-like curable resin composition of the present invention has an appropriate viscosity and storage elastic modulus, the gel-like curable resin composition is difficult to leak out and can be easily molded into a desired shape, and can be protected in an image display device such as a liquid crystal display device. It can be suitably used as a component for filling the space between the panel and the image display unit.

DESCRIPTION OF SYMBOLS 1 Image display unit 10 Liquid crystal display cell 20, 22 Polarizing plate 30 Touch panel 31, 32 Resin layer 40 Protection panel 50 Backlight system

Claims (13)

(A) a compound having a (meth) acryloyl group,
(B) an oil gelling agent, and (C) a polymerization initiator,
A gel-like curable resin composition comprising
A gel-like curable resin composition having a storage elastic modulus at 25 ° C. of 0.01 to 10 kPa.   Furthermore, (D) The gel-like curable resin composition of Claim 1 containing a plasticizer.   (A) Gel curable resin composition of Claim 1 or 2 containing the isoprene polymer which has a (meth) acryloyl group as a component.   (A) Gel curable resin composition of any one of Claims 1-3 whose content of a component is 10-90 mass% with respect to the total amount of the said gel curable resin composition. object.   The component (A) includes (A1) a polymer having an ethylenically unsaturated bond in the molecule, and (A2) a monomer having one ethylenically unsaturated bond in the molecule. The gel-like curable resin composition according to any one of the above.   The gel-like curable resin composition according to claim 5, wherein the content of the component (A2) in the total amount of the gel-like curable resin composition is 0.5 to 30% by mass.   The gel-like curable resin composition according to any one of claims 1 to 6, which does not contain an organic solvent and has a viscosity at 25 ° C of 1 to 100 Pa · s.   The gel-like curable resin composition of any one of Claims 1-7 whose storage elastic modulus in 25 degreeC is 0.05-5 kPa. Oil gelling agent (B) is hydroxy fatty acid, n-lauroyl-L-glutamic acid-α, β-dibutyramide, di-p-methylbenzylidene sorbitol glucitol, 1,3: 2,4-bis-O-benzylidene -D-glucitol, 1,3: 2,4-bis-O- (4-methylbenzylidene) -D-sorbitol, bis (2-ethylhexanoato) hydroxyaluminum, and the following general formulas (1) to (12) The gel-like curable resin composition of any one of Claims 1-8 which is at least 1 type of the compound represented by these.

(In General Formula (1), m is an integer of 3 to 10, n is an integer of 2 to 6, R ₁ is a saturated hydrocarbon group having 1 to 20 carbon atoms, and X is sulfur or oxygen.
In the general formula (2), R ₂ represents a saturated hydrocarbon group having 1 to 20 carbon atoms, Y ₁ is a bond or a benzene ring.
In the general formula (3), R ₃ is a saturated hydrocarbon group having 1 to 20 carbon atoms, and Y ₂ is a bond or a benzene ring.
In the general formula _(4), R 4 is a saturated hydrocarbon group having 1 to 20 carbon atoms.
In General Formula (6), R ₅ and R ₆ are each independently a saturated hydrocarbon group having 1 to 20 carbon atoms.
In the general formula (7), R ₇ is a saturated hydrocarbon group having 1 to 20 carbon atoms.
In general formula (8), R < ₈ > is a C1-C20 saturated hydrocarbon group.
In General Formula (10), R ₉ and R ₁₀ are each independently a saturated hydrocarbon group having 1 to 20 carbon atoms. )   An image display device having a laminated structure including an image display unit having an image display unit, a protection panel, and a resin layer present between the image display unit and the protection panel, the resin layer comprising: The image display apparatus which consists of hardened | cured material of the gel-like curable resin composition of any one of Claims 1-9. Laminated structure including an image display unit having an image display unit, a touch panel, a protection panel, and a resin layer that is present between at least one of the image display unit and the touch panel and between the touch panel and the protection panel. An image display device comprising:
The image display apparatus which at least 1 layer of the said resin layer consists of hardened | cured material of the gel-like curable resin composition of any one of Claims 1-9. A method for manufacturing an image display device comprising an image display unit and a protection panel,
A step of interposing the gel-like curable resin composition according to any one of claims 1 to 9 between the image display unit and the protective panel;
A process for curing the gel-like curable resin composition by performing at least one of light irradiation from the protective panel surface side and heating of the gel-like curable resin composition. Method.   It is a manufacturing method of the apparatus for image displays provided with an image display unit, a touch panel, and a protection panel, Comprising: Between the said image display unit and the said touch panel, and / or between the said touch panel and the said protection panel, Claim 1- By carrying out at least one of the step of interposing the gel-like curable resin composition according to any one of 9 and light irradiation from the protective panel surface side and heating of the gel-like curable resin composition A method for producing an image display device, comprising a step of curing the gel-like curable resin composition.

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