Photocurable composition for inkjet, method for manufacturing an image display device, and image display device

Abstract

To provide a photocurable composition which is a photocurable composition enabling executing with a general small inkjet device using piezoelectric elements, formation of a light transmissive photocurable resin layer in an image display device obtained by laminating an image display member and a light transmissive cover member via the light transmissive photocurable resin layer, and shows characteristics equivalent to or greater than adhesiveness, holding power and light transmissivity of a conventional photocurable resin composition after photocuring.SOLUTION: A photocurable composition for inkjet for forming a light transmissive photocurable resin layer of an image display device obtained by laminating an image display member and a light transmissive cover member via the light transmissive photocurable resin layer contains at least 80 mass% of a hydroxy group-containing monofunctional (meth)acrylate monomer. The hydroxy group-containing monofunctional (meth)acrylate monomer is preferably a 1-6C alkyl(meth)acrylate monomer. As the examples, hydroxyethyl acrylate, hydroxypropyl acrylate or hydroxybutyl acrylate is cited, and among them, 4-hydroxybutyl acrylate is preferable.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a photocurable composition for inkjet. The present invention also relates to a method for manufacturing an image display device in which an image display member such as an organic EL panel and a light-transmissive cover member disposed on the surface side thereof are laminated via a light-transmissive photocured resin layer derived from the photocurable composition for inkjet, and an image display device manufactured in this way.

Background Art

[0002] Many of the image display devices used in information terminals such as smartphones have either an image display member such as an organic EL panel having a flat rectangular surface or a light-transmissive cover member such as a light-transmissive glass or plastic plate. A photocurable resin composition having a relatively high viscosity (for example, a viscosity of about 1000 mPa·s to 5000 mPa·s measured by a cone plate rheometer) is applied in a film form using a slit-type resin dispenser, and then the composition film is irradiated with ultraviolet rays to be cured to form a light-transmissive cured resin layer. The image display member and the light-transmissive cover member are adhered and laminated via the light-transmissive cured resin layer (Patent Document 1).

[0003] By the way, in recent years, as image display devices have come to be used in various industrial products, as the screen shape of image display devices, irregular shapes such as elliptical shapes, curved shapes, and three-dimensional shapes have been required instead of flat rectangular shapes. For this reason, instead of the conventional slit-type resin dispenser, an inkjet device capable of coping with minute surfaces and curved surfaces has been tried for forming a photocurable resin composition layer on an irregular-shaped image display member or light-transmissive cover member (Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] However, although conventional photocurable resin compositions exhibit satisfactory properties in terms of adhesiveness, holding power, and light transmittance after photocuring, they contain relatively high molecular weight resins and oligomers, so their viscosity is relatively high, and there has been a problem that it is difficult to discharge them from the nozzles of general small inkjet devices using piezo elements.

[0006] An object of the present invention is to solve the above problems of the conventional technology, and as a photocurable composition for forming the light-transmissive photocurable resin layer in an image display device in which an image display member and a light-transmissive cover member are laminated via a light-transmissive photocurable resin layer, it can be discharged even by a general small inkjet device using a piezo element, and moreover, to provide a composition exhibiting properties equal to or better than the adhesiveness, holding power, and light transmittance of the conventional photocurable resin composition after photocuring.

MEANS FOR SOLVING THE PROBLEMS

[0007] The present inventors have found that the object of the present invention can be achieved by constituting most of a light-transmissive photocurable composition applicable to a general small inkjet device using a piezo element with a hydroxy group-containing monofunctional (meth)acrylate monomer, and have completed the present invention.

[0008] That is, the present invention provides an inkjet photocurable composition for forming the light-transmissive photocurable resin layer of an image display device in which an image display member and a light-transmissive cover member are laminated via a light-transmissive photocurable resin layer, the inkjet photocurable composition containing at least 80% by mass of a hydroxy group-containing monofunctional (meth)acrylate monomer.

[0009] The present invention also provides a method for manufacturing an image display device in which an image display member and a light-transmissive cover member are laminated via a light-transmissive photocurable resin layer, the method including the following steps (a) to (c): Step (a) A step of discharging the above-described inkjet photocurable composition onto the surface of the image display member or the light-transmissive cover member by an inkjet method to form a photocurable composition layer: Step (b) A step of irradiating the photocurable composition layer with ultraviolet rays to form a light-transmissive photocurable resin layer having a curing rate of 10% or more; Step (c) A step of laminating the image display member and the light-transmissive cover member via the light-transmissive photocurable resin layer and provides a manufacturing method having the above steps.

[0010] Furthermore, the present invention provides an image display device in which an image display member and a light-transmissive cover member are laminated via a light-transmissive photocurable resin layer derived from the above-described inkjet photocurable composition of the present invention.

Advantages of the Invention

[0011] The inkjet photocurable composition of the present invention contains at least 80% by mass of a hydroxy group-containing monofunctional (meth)acrylate monomer. Therefore, the inkjet photocurable composition of the present invention can be discharged by a general small inkjet device using a piezo element. Moreover, the photocured product thereof exhibits good adhesion and holding power, and further exhibits good light transmittance.

Brief Description of the Drawings

[0012] [Figure 1] FIG. 1 is an explanatory diagram of the method for manufacturing the image display device of the present invention. [Diagram 2] FIG. 2 is an explanatory diagram of the method for manufacturing the image display device of the present invention. [Diagram 3] FIG. 3 is an explanatory diagram of the method for manufacturing the image display device of the present invention. [Figure 4] FIG. 4 is an explanatory diagram of the method for manufacturing the image display device of the present invention. [Diagram 5] Figure 5 is a cross-sectional view of the sample to be used in the adhesion test and the holding force test. [Figure 6] Figure 6 is an explanatory view of the adhesion test. [Figure 7] Figure 7 is an explanatory view of the holding force test. [Figure 8] Figure 8 is an explanatory view of the preparation of the sample for the light transmittance test.

Embodiments for Carrying Out the Invention

[0013] <Photocurable Composition for Inkjet> The photocurable composition for inkjet of the present invention is a composition for forming the light-transmissive photocurable resin layer of an image display device in which an image display member and a light-transmissive cover member are laminated via a light-transmissive photocurable resin layer. Its feature is that it contains at least 80% by mass, preferably 88% by mass or more of a hydroxy group-containing monofunctional (meth)acrylate monomer. If it is less than 80% by mass, the adhesion, holding force, and light transmittance of the photocured product tend to decrease excessively.

[0014] Here, "for inkjet" means that the photocurable composition is particularly suitable for being ejected from an inkjet device, and does not mean that it cannot be applied to other general coating methods. Also, as the applicable "inkjet" device, it can be applied to both piezo element type and thermal type devices, but a piezo element type inkjet device can be preferably applied because it is easy to suppress nozzle clogging.

[0015] As the "image display member", known image display panels such as an organic EL panel, a liquid crystal display panel, and a plasma display panel can be used. In particular, an organic EL panel excellent in curvature can be preferably used. A polarizing plate can be provided on these image display members as needed. Further, the "light-transmissive cover member" is for protecting the image display member from external force and blocking the image display member from gases such as oxygen. Also, since the image is visually recognized through it, a light-transmissive glass plate or plastic plate can be used. Examples of the "image display device" include a television set, a smartphone, a mobile computer, a wristwatch, and a touch panel.

[0016] Further, the "photocurability" of the inkjet photocurable composition means a property that can be cured by radical polymerization, cationic polymerization, or anionic polymerization mainly by irradiation with ultraviolet rays.

[0017] As described above, the inkjet photocurable composition of the present invention contains at least 80% by mass of a monofunctional (meth)acrylate monomer containing a hydroxy group. Here, it is preferable from the viewpoint of the water resistance of the photocured product that the number of hydroxy groups contained in the monofunctional (meth)acrylate monomer is one, but it may have two or more. Further, since it is monofunctional, it is necessary that there is one (meth)acrylate residue. This is because if there are two or more, there is a concern that the adhesive force and holding force of the photocured product will be greatly reduced. Note that "(meth)acrylate" includes methacrylate and acrylate.

[0018] As the hydroxy group-containing monofunctional (meth)acrylate monomer described above, a hydroxyalkyl (meth)acrylate monomer is preferably used. Here, the number of carbon atoms of the alkyl is not limited, but is usually C1 to 12, preferably C1 to 6, and specifically, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, hexyl, 2-ethylbutyl, etc. may be mentioned. Among them, hydroxyethyl acrylate, hydroxypropyl acrylate, and hydroxybutyl acrylate are preferred, and particularly, 4-hydroxybutyl acrylate is preferred.

[0019] The inkjet photo-curable composition of the present invention can further contain a hydroxy group-free monofunctional (meth)acrylate monomer that does not contain a hydroxy group in order to adjust various properties of the photocured product. The content thereof is preferably not more than 20% by mass from the viewpoint of imparting the desired adhesiveness to the photocured product. Examples of such a hydroxy group-free monofunctional (meth)acrylate monomer include C8 to 20 alkyl (meth)acrylate monomers, cycloalkyl or bicycloalkyl (meth)acrylate monomers, or heterocycloalkyl or heterobicycloalkyl (meth)acrylate monomers.

[0020] Preferred C8 to 20 alkyl (meth)acrylate monomers that do not contain a hydroxy group include isostearyl acrylate and lauryl acrylate. Examples of the cycloalkyl or bicycloalkyl (meth)acrylate monomer that does not contain a hydroxy group preferably include isobornyl acrylate. Examples of the heterocycloalkyl or heterobicycloalkyl (meth)acrylate monomer that does not contain a hydroxy group preferably include morpholyl acrylate.

[0021] The photocurable composition for inkjet of the present invention can further contain a polyfunctional (meth)acrylate monomer from the viewpoint of imparting cohesive force to the photocured product, improving mechanical strength, and further improving solvent resistance. The content is preferably 0.01% by mass or more and 20% by mass or less from the viewpoint of imparting the desired adhesiveness to the photocured product. Examples of such polyfunctional (meth)acrylate monomers include compounds in which two or more (meth)acrylate residues are bonded to a polyol compound such as an alkyldiol, cycloalkyldiol, or dicycloalkyldiol. Particularly preferred polyfunctional (meth)acrylate monomers include pentaerythritol tri- or tetraacrylate, hexanediol diacrylate, and the like.

[0022] The photocurable composition for inkjet of the present invention can contain a known photo radical, photo cationic, or photo anionic polymerization initiator. The content varies depending on the polymerization type of the photo polymerization initiator. In the case of a photo radical polymerization initiator, it is preferably 0.1% by mass or more and 5% by mass or less. Preferred photo radical polymerization initiators include alkylphenone-based photo polymerization initiators, particularly Omnirad 184 (1-hydroxy-cyclohexyl-phenyl-ketone, IGM Resins B.V.), and acylphosphine oxide-based photo polymerization initiators, particularly Omnirad TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide, IGM Resins B.V.).

[0023] The photocurable composition for inkjet of the present invention needs to have an appropriate viscosity to achieve good inkjet ejection. Specifically, using a cone plate rheometer (RS600, HAAKE), the viscosity measured under the conditions of 25°C, cone and plate C35 / 2, and a rotation speed of 10 rpm is preferably 1 mPa·s or more, more preferably 5 mPa·s or more, from the viewpoint of the shape retention of the inkjet ejectate, and preferably 30 mPa·s or less, more preferably 20 mPa·s or less, from the viewpoint of smooth ejection properties.

[0024] In addition, the photocurable composition for inkjet of the present invention preferably has a hydroxyl value according to JIS K0070 of 50 mgKOH / g or more, more preferably 200 mgKOH / g or more, from the viewpoints of the adhesion and surface hardness of the photocured product, and preferably 800 mgKOH / g or less, more preferably 500 mgKOH / g or less, from the viewpoint of the water resistance of the photocured product.

[0025] The photocurable composition for inkjet of the present invention preferably does not contain a high molecular substance having a weight average molecular weight of 5000 or more from the viewpoint of reducing viscosity. Further, it preferably does not contain an organic solvent and an organic pigment from the viewpoints of solvent removal time and reduction of environmental load.

[0026] Incidentally, the photocurable composition for inkjet of the present invention can contain components such as a silane coupling agent and an antioxidant, as necessary, within a range that does not impair the effects of the invention.

[0027] The photocurable composition for inkjet of the present invention can be prepared by appropriately adding other components, as necessary, to a hydroxy group-containing monofunctional (meth)acrylate monomer so that it is 80% by mass or more, and uniformly mixing them.

[0028] The photocurable composition for inkjet described above is particularly suitable for forming the light-transmissive photocurable resin layer of an image display device in which an image display member and a light-transmissive cover member are laminated via a light-transmissive photocurable resin layer. Hereinafter, a method for manufacturing an image display device of the present invention will be described.

[0029] <Method for manufacturing an image display device> An image display device in which an image display member and a light-transmissive cover member are laminated via a light-transmissive photocurable resin layer has the following steps (a) to (c).

[0030] (Step (a)) First, as shown in FIG. 1, the photocurable composition 2 for inkjet of the present invention is discharged onto the surface of the image display member 1 (or the light-transmissive cover member) by an inkjet method to form a photocurable composition layer 3. Specifically, preferably, the photocurable composition 2 for inkjet is discharged as minute droplets from the nozzles NZ of an inkjet head IJH of a general inkjet apparatus of the piezo element system, and the photocurable composition layer 3 is formed on one side of the image display member 1. The photocurable composition layer 3 may be a single layer without voids two-dimensionally, may be linear, or may be dot-shaped. The layer thickness of the photocurable composition layer 3 can also be set as appropriate. Note that the image display member 1 and the light-transmissive cover member may have a flat rectangular shape, but may also have a curved shape, an irregular shape such as a circular or elliptical shape, or a cylindrical shape. As a preferable image display member 1, an organic EL panel provided with a polarizing plate can be preferably adopted.

[0031] (Step (b)) Next, as shown in FIG. 2, ultraviolet rays (UV) are irradiated onto the photocurable composition layer 3 to form a light-transmissive photocurable resin layer 4 having a curing rate of 10% or more, preferably 30% or more and 85% or less. Here, the curing rate, also referred to as the gel fraction, is a numerical value defined as the ratio (consumption ratio) of the amount of (meth)acryloyl groups present in the photocurable composition layer after ultraviolet irradiation to the amount of (meth)acryloyl groups present in the photocurable composition layer before ultraviolet irradiation. The larger this numerical value, the more the curing has progressed. Specifically, the curing rate (gel fraction) is the absorption peak height (X) from the baseline in the FT-IR measurement chart of the photocurable composition layer 3 before ultraviolet irradiation at 1640 to 1620 cm -1 and the absorption peak height (Y) of the absorption peak at 1640 to 1620 cm -1 from the baseline in the FT-IR measurement chart of the photocurable composition layer after ultraviolet irradiation (the absorption peak derived from the carbon-carbon double bond of the (meth)acryloyl group) can be calculated by substituting them into the following mathematical formula.

[0032]

Formula

[0033] The curing rate can be adjusted by appropriately changing the type of ultraviolet light, the irradiation intensity, the irradiation time, etc.

[0034] The degree of light transmittance of the light-cured resin layer 4 is such that the transmittance of light with a wavelength of 550 nm is 90% or more when the layer has a thickness of 0.1 mm.

[0035] (Step (C)) Next, as shown in Fig. 3, the image display member 1 and the light-transmitting cover member 5 are laminated in a conventional manner with the photocured resin layer 4 interposed therebetween. This results in an image display device 10. Note that, although the image display member 1 and the light-transmitting cover member 5 are generally assumed to have a flat rectangular shape, the present invention is not limited thereto, and irregular shapes such as elliptical, curved, and three-dimensional shapes can also be used. Therefore, irregular joining can be performed during the lamination in step (iii).

[0036] (Step (D)) 4, the photocurable resin layer 4 is further irradiated with ultraviolet (UV) rays from the light-transmitting cover member 5 side. This further increases the curing rate of the photocurable resin layer 4, and stabilizes the performance of the image display device 10.

[0037] The image display device manufactured by the manufacturing method of the image display device described above, that is, an image display device in which an image display member and a light-transmitting cover member are laminated via a light-transmitting photocurable resin layer derived from the photocurable composition for inkjet of the present invention, is also an aspect of the present invention. In this image display device, the image display member and the light-transmitting cover member are laminated via a light-transmitting photocurable resin layer having excellent light transparency derived from the photocurable composition for inkjet of the present invention, so that the image display member and the light-transmitting cover member are firmly bonded and the visibility of the image is also good. EXAMPLES

[0038] The present invention will be specifically described below.

[0039] Examples 1 to 10, Comparative Examples 1 and 2 By uniformly mixing the components of the composition shown in Table 1, a photocurable composition for inkjet was prepared. For the obtained photocurable composition for inkjet, "viscosity · inkjet suitability", "adhesion", "retention", and "light transmittance" were tested and evaluated as described below. The obtained results are also shown in Table 1.

[0040] The details of the components in Table 1 are as follows. (Hydroxy group-containing monofunctional acrylate) 4HBA: 4-Hydroxybutyl acrylate, Osaka Organic Chemical Industry Co., Ltd. HPA: Hydroxypropyl acrylate, Osaka Organic Chemical Industry Co., Ltd. HEA: Hydroxyethyl acrylate, Osaka Organic Chemical Industry Co., Ltd. (Hydroxy group-free monofunctional alkyl acrylate) ISTA: Isostearyl acrylate, Osaka Organic Chemical Industry Co., Ltd. LA: Lauryl acrylate (product name; NK Ester LA), Shin-Nakamura Chemical Co., Ltd. (Hydroxy group-free monofunctional alicyclic acrylate) IBOA: Isobornyl acrylate (product name; SR506), Arkema (Hydroxy group-free monofunctional heterocyclic acrylate) ACMO: Acryloylmorpholine, KJ Chemicals Co., Ltd. (Hydroxy group-containing triacrylate) PETA: Pentaerythritol triacrylate (product name; Miramer M340), Miwon (Alkyl diacrylate) HDDA: Hexanediol diacrylate (product name; Miramer M200), Miwon (Photopolymerization initiator) Omnirad TPO: 2,4,6-Trimethylbenzoyl-diphenyl-phosphine oxide, IGM Resins B.V. Omnirad 184: 1-Hydroxy-cyclohexyl-phenyl-ketone, IGM Resins B.V.

[0041] (Viscosity · Inkjet Suitability) The viscosity of the photocurable composition for inkjet was measured using a cone plate rheometer (RS600, HAAKE) at 25 °C under the conditions of a cone and plate C35 / 2 and a rotation speed of 10 rpm. The measurement results are shown in Table 1. The viscosity of the photocurable composition for inkjet is preferably in the range of 5 mPa·s or more and 30 mPa·s or less.

[0042] (Inkjet Suitability) fruit The photocurable compositions for inkjet of Examples 1 to 10 and Comparative Examples 1 to 2 The compositions were ejected using a piezoelectric inkjet device. All of them Since the viscosity was within the range of 5 to 20 mPa·s, the ink could be discharged satisfactorily without causing any discharge defects.

[0043] (Samples for Adhesion Test and Retention Test) The photocurable composition for inkjet was discharged from the inkjet device used in the evaluation of "Viscosity · Inkjet Suitability" onto a 25 mm-wide strip-shaped backing sheet (polyester terephthalate (PET) sheet) from one end to the other end so as to have a thickness of 0.5 mm and a length of 6 cm (in the case of the adhesion test) or 25 mm (in the case of the retention test) over the entire width. The formed photocurable composition layer was irradiated with ultraviolet light having a wavelength of 365 nm from an LED at 2000 mJ / cm 2 to form a photocured resin layer R on the backing sheet B, thereby preparing samples (Figure 5) for the adhesion test and the retention test.

[0044] (Adhesion Test) The adhesion test sample was placed on a glass plate as the adherend, and a roller with a mass of 2 kg was reciprocated once from above to attach it, and then left in a room at 25°C for 1 hour. After leaving, using a tensile testing machine (AGS-H, Shimadzu Corporation), as shown in Fig. 6, the backing sheet B was pulled in the direction of the arrow (180-degree direction) at a pulling speed of 300 mm / min, and the peel strength was measured. Practically, it is desired that the 180-degree peel strength is 20 N / 25 mm or more. In addition, when the backing sheet was broken, it was described as "material break" in the table.

[0045] (Retention force test) The retention force test sample was placed on a glass plate as the adherend, and a roller with a mass of 2 kg was reciprocated once from above to attach it, and then left in a room at 25°C for 1 hour. After leaving, using a retention force testing machine (BE-501, Tester Sangyo Co., Ltd.), as shown in Fig. 7, a load W of 1 kg was applied to the backing sheet B in the vertical direction (the direction of the arrow in the figure). When the backing sheet B did not fall 「 Good "Good" was evaluated, and the displacement amount (mm) after 1 hour was measured. It can be evaluated that the smaller the displacement amount, the more preferable. Also, when the backing sheet fell 「 Not good" was evaluated, and the time until it fell was measured. 「 Poor 」 Even when evaluated as such, it is desired that the time until it falls is long.

[0046] (Light transmittance test) The inkjet photo-curable composition was discharged from an inkjet device used for evaluating viscosity and inkjet suitability onto a 0.4-mm-thick transparent glass plate to a thickness of 0.1 mm, and a 0.4-mm-thick transparent glass plate was placed on the formed photo-curable composition layer. Next, as shown in Fig. 8, ultraviolet rays were irradiated from a metal halide lamp at 5000 mJ / cm through one-sided transparent glass plate 2Irradiated it with [light] to form a photocurable resin layer R between a pair of glass plates. The transmittance of light at 550 nm of this photocurable resin layer was measured using a spectrophotometer (UV-2450, manufactured by Shimadzu Corporation). The higher the transmittance, the more preferable it is, and it is desirably 90% or more in practical use.

[0047]

Table 1

[0048] (Consideration of Results) From the comparison between the examples and the comparative examples, it can be seen that the inkjet photocurable composition containing at least 80% by mass of the hydroxy group-containing (meth)acrylate monomer exhibits good characteristics in terms of viscosity, inkjet suitability, adhesive strength, holding power, and light transmittance.

Industrial Applicability

[0049] Since the inkjet photocurable composition of the present invention contains at least 80% by mass of the hydroxy group-containing monofunctional (meth)acrylate monomer, it can be discharged by a small and general inkjet device using a piezo element. Moreover, the photocured product thereof exhibits good adhesive strength and holding power, and further exhibits good light transmittance. Therefore, the inkjet photocurable composition of the present invention is useful for forming the light-transmissive photocurable resin layer in an image display device in which an image display member and a light-transmissive cover member are laminated via the light-transmissive photocurable resin layer.

Explanation of Reference Numerals

[0050] 1 Image display member 2 Inkjet photocurable composition 3 Photocurable composition layer 4, R Light-transmissive photocurable resin layer 5 Light-transmissive cover member 10 Image display device B Backing sheet IJH Inkjet head NZ Nozzle UV Ultraviolet ray W load

Claims

1. An inkjet curable composition for forming the light-transmissive photocurable resin layer of an image display device in which an image display member and a light-transmissive cover member are laminated via a light-transmissive photocurable resin layer, The inkjet curable composition contains at least 80% by mass of a hydroxy group-containing monofunctional (meth)acrylate monomer.

2. The inkjet curable composition according to claim 1, wherein the hydroxy group-containing monofunctional (meth)acrylate monomer is a hydroxy C1-6 alkyl (meth)acrylate monomer.

3. The inkjet curable composition according to claim 1, wherein the hydroxy group-containing monofunctional (meth)acrylate monomer is hydroxyethyl acrylate, hydroxypropyl acrylate or hydroxybutyl acrylate.

4. The inkjet curable composition according to claim 1, wherein the hydroxy group-containing monofunctional (meth)acrylate monomer is 4-hydroxybutyl acrylate.

5. Furthermore, the inkjet curable composition according to any one of claims 1 to 4 contains a hydroxy group-free monofunctional (meth)acrylate monomer in an amount not exceeding 20% by mass.

6. The inkjet curable composition according to claim 5, wherein the hydroxy group-free monofunctional (meth)acrylate monomer is a C8-20 alkyl (meth)acrylate monomer, a cycloalkyl or bicycloalkyl (meth)acrylate monomer, or a heterocycloalkyl or heterobicycloalkyl (meth)acrylate monomer.

7. The inkjet curable composition according to claim 5, wherein the hydroxy group-free monofunctional (meth)acrylate monomer is isostearyl acrylate or lauryl acrylate.

8. The inkjet curable composition according to claim 5, wherein the hydroxy group-free monofunctional (meth)acrylate monomer is isobornyl acrylate.

9. The inkjet curable composition according to claim 5, wherein the hydroxy group-free monofunctional (meth)acrylate monomer is morpholyl acrylate.

10. Furthermore, the inkjet curable composition according to any one of claims 1 to 9 contains a polyfunctional (meth)acrylate monomer in an amount of 0.01% by mass or more and 20% by mass or less.

11. 11. The photocurable composition for ink jet recording according to claim 10, wherein the polyfunctional (meth)acrylate monomer is pentaerythritol tri- or tetraacrylate, or hexanediol diacrylate.

12. 12. The photocurable composition for inkjet according to claim 1, further comprising a photoradical polymerization initiator in an amount of 0.1% by mass or more and 5% by mass or less as a photopolymerization initiator.

13. 13. The photocurable composition for ink jet recording according to claim 12, wherein the photoradical polymerization initiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide.

14. 14. The photocurable composition for inkjet according to any one of claims 1 to 13, wherein the viscosity measured using a cone and plate rheometer under conditions of 25°C, cone and plate C35 / 2, and a rotation speed of 10 rpm is 5 mPa·s or more and 30 mPa·s or less.

15. The photocurable composition for inkjet according to any one of claims 1 to 14, wherein a hydroxyl value according to JIS K0070 is from 50 mgKOH / g to 800 mgKOH / g.

16. 16. The photocurable composition for inkjet according to claim 1, which does not contain a polymeric substance having a weight average molecular weight of 5,000 or more, an organic solvent, or an organic pigment.

17. A method for manufacturing an image display device in which an image display member and a light-transmitting cover member are laminated via a light-transmitting photocurable resin layer, the method comprising the steps of (a) to (c): Process (A) A step of discharging the photocurable composition for inkjet according to any one of claims 1 to 16 onto a surface of an image display member or a light-transmitting cover member by an inkjet method to form a photocurable composition layer: Process (b) a step of irradiating the photocurable composition layer with ultraviolet light to form a light-transmitting photocurable resin layer having a cure rate of 10% or more; Process (C) A step of laminating an image display member and a light-transmitting cover member via a light-transmitting photocurable resin layer. The manufacturing method comprising the steps of:

18. Further, the following process (D) Process (D) Following the step (c), a step of further irradiating ultraviolet light from the light-transmitting cover member side. The method of claim 17, comprising:

19. 19. The method according to claim 17 or 18, wherein heterojunction is performed during the lamination in the step (c).

20. The manufacturing method according to any one of claims 17 to 19, wherein in step (a), an organic EL panel provided with a polarizing plate as an image display member is selected, and an inkjet curable composition for inkjet is discharged onto the polarizing plate by an inkjet method.

21. An image display device in which an image display member and a light-transmissive cover member are laminated via a light-transmissive photocurable resin layer derived from the inkjet curable composition according to any one of claims 1 to 16.

Images