TW201833283A - Photocurable composition, pressure-sensitive adhesive sheet, pressure-sensitive adhesive sheet laminate, cured product, laminate for forming image display device, and image display device - Google Patents

Abstract

The present invention provides a novel photocurable composition that, when heated to a hot-meltable temperature, is capable of conforming to, and filling every corner of uneven portions of a bonding surface, and after being photo-cured, capable of further firmly binding adherents. Proposed by the present invention is a photocurable composition that comprises (A) a (meth)acrylic copolymer containing a macromonomer as a copolymerizable component, (B) a cross-linking agent, and (C) a cross-linkage initiator, and that is characterized by having a half value width X1 (nm-1) of 0.05 < X1 < 0.30 in a one-dimensional scattering profile obtained from small-angle X-ray scattering measurement.

Description

Photocurable composition, adhesive sheet, adhesive sheet laminate, cured product, laminated body for image display device configuration, and image display device

The present invention relates to a photocurable composition using a (meth)acrylic copolymer containing a macromonomer as a structural unit, and an adhesive sheet, an adhesive sheet laminate, a cured product, and an image display device using the same. A laminated body and an image display device.

The macromono system has a high molecular weight monomer capable of bonding functional groups. The graft copolymer can be easily synthesized by addition or copolymerization of a macromonomer with other monomers. Moreover, if a macromonomer is used to synthesize a graft copolymer, the resins having different physical properties can be separately separated and introduced into the branched component and the main component in a simple and pure manner. Therefore, various uses are also proposed in the field of adhesives. Such a macromonomer adhesive composition. For example, Patent Document 1 discloses a resin composition for an adhesive which is excellent in adhesive properties such as adhesion, adhesion, and cohesive force, and discloses a resin composition for an adhesive comprising a number average molecular weight of 1,000 Å. a graft copolymer obtained by radical polymerization of a macromonomer having a glass transition temperature of -20 ° C or less, a radical polymerizable monomer having a hydroxyl group or a carboxyl group, and other monomers, and a glass transition temperature of the main polymer Higher than the glass transition temperature of the branched polymer. Patent Document 2 discloses a method for improving the durability and re-peelability under high-temperature and high-humidity conditions, and uses an adhesive having a glass transition temperature of 40° C. or higher and a number average molecular weight of 2,000 to 20,000 ( 0.2 to 3 parts by mass of a methyl acrylonitrile-based macromonomer, 57 to 98.8 parts by mass of an alkyl (meth)acrylate, 1 to 20 parts by mass of a functional group-containing monomer, and at least to the (meth)acrylic acid The copolymer of 0 to 20 parts by mass of the other monomer copolymerized with the base ester (weight average molecular weight: 500,000 to 2,000,000). In Patent Document 3, it is easy to bond with various adherends, and it can be cured after bonding to exhibit the same degree of adhesion as the adhesive, and it is less likely to cause a self-cutting surface when the cutting process is performed. The adhesive composition exuding or cutting the surface of each other, reveals a hardening type adhesive composition comprising 1 to 30 of the alkyl (meth) acrylate monomer and all the monomer components An acrylic adhesive polymer, a photocationic polymerizable compound, and a photocationic photopolymerization starting from a mass % of an average molecular weight Mn of from 1,000 to 200,000 and a macromonomer having a glass transition point Tg of from 30 to 150 ° C Agent. In Patent Document 4, when the filler is contained in a high content in the adhesive layer of the adhesive tape, the adhesiveness is also excellent, and when it is exposed to a high temperature, the pressure-sensitive adhesive is maintained. a pressure-sensitive adhesive comprising a (meth)acrylic copolymer as a main polymer and a (meth)acrylic macromonomer as a branched polymer (meth)acrylic graft copolymer, Crosslinking agent and filler. In Patent Document 5, in a normal state, that is, in a room temperature state, it is possible to provide a peelable degree of adhesion (referred to as "stickiness"), and if it is heated to a temperature at which it can be melted, it has fluidity. An adhesive resin composition which can be adhered to the step of the bonding surface and can be finally adhered to each other by the adherend, revealing an adhesive resin composition characterized in that it contains acrylic copolymer 100 parts by mass of the substance (A), 0.5 to 20 parts by mass of the crosslinking agent (B), and 0.1 to 5 parts by mass of the crosslinking initiator (C), and the weight of the acrylic copolymer (A) a graft copolymer having an average molecular weight of 5.0×10 ⁴ to 5.0×10 ⁵ , containing a repeating unit derived from (meth) acrylate as a main component of the graft copolymer, and containing a number average molecular weight of 5.0×10 ² The above repeating unit of the macromonomer of 6.0×10 ³ is used as a branching component of the graft copolymer, and the source of the graft copolymer is contained in the acrylic copolymer (A) in a ratio of 0.1 to 3 mol%. Repeat unit of body. Further, Patent Document 6 discloses an adhesive composition and an adhesive sheet using the adhesive composition, which comprises a macromonomer having a number average molecular weight of 500 or more and less than 6,000 ( a) A (meth)acrylic copolymer (A) having a weight average molecular weight of 50,000 to 1,000,000 obtained by polymerization of a monomer mixture of the vinyl monomer (b). Patent Document 7 discloses a method for producing a laminate for a novel image display device, which is capable of maintaining a sheet shape at room temperature and having a peelable degree of adhesion. The film is melted and fluid, and finally, the image display device constituent members are firmly adhered to each other by crosslinking. Patent Document 8 discloses a photocurable adhesive sheet which can be photohardened even if it has a portion such as a printed concealing portion that is hard to reach, even if it is an adhesive sheet having a certain thickness. The sheet can be hardened as a whole. Patent Document 9 discloses a method for forming an optical device constituting body obtained by temporarily bonding two optical device constituting members via a transparent adhesive material, and separating two optical device constituting members, and configuring the optical device. The components are reused. Patent Document 10 discloses an adhesive sheet laminate which is attached to a member of an image display device and which can prevent foreign matter from entering at the interface between the adhesive layer and the release layer, or the release agent from being applied to the adhesive layer. Transfer transfer, and durability after bonding is also excellent. [PRIOR ART DOCUMENT] Patent Document 1: Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. [Patent Document 5: International Publication No. 2015/080244A1 Patent Document 7: International Publication No. 2015/137178A1 Patent Document 8: International Publication 2016/024618A1 Patent Document 9: International Publication No. 2016/002763A1 Patent Document 10: International Publication No. 2016/088697A1

[Problem to be Solved by the Invention] The present invention is intended to further improve the photocurable composition as disclosed above, that is, a (meth)acrylic copolymer having a macromonomer as a structural unit and a crosslinking agent. The photocurable composition provides a novel light which can be adhered to each other after being heated to a temperature at which heat can be melted, and can be adhered to the uneven portions of the bonding surface. A curable composition. [Technical means for solving the problem] The present invention provides a photocurable composition comprising a (meth)acrylic copolymer (A) containing a macromonomer as a structural unit, and a crosslinking agent (B). And the cross-linking initiator (C), and the half-width X1 (nm ^-1 ) of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement is 0.05 < X1 < 0.30. [Effect of the Invention] The photocurable composition according to the present invention can maintain a sheet shape at room temperature and exhibit self-adhesiveness (referred to as "viscosity"), and if it is heated in an uncrosslinked state, Then, it softens or flows. For example, it can be softened or flowed by heating to a glass transition temperature of the giant monomer, and is filled around the uneven portion of the bonding surface. Further, by performing photocuring, excellent cohesive force can be exhibited, so that the adherends can be firmly bonded to each other.

Hereinafter, an example of an embodiment of the present invention will be described. However, the present invention is not limited to the following embodiments. [The present light curable composition] The composition (referred to as "the present photocurable composition") according to an embodiment of the present invention is a photocurable composition characterized in that it contains a macromonomer as a The (meth)acrylic copolymer (A), the crosslinking agent (B) and the crosslinking initiator (C) of the structural unit, and the half value width X1 of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement (nm ^-1 ) is 0.05 < X1 < 0.30. The above "containing a macromonomer as a structural unit" is also included as a (meth)acrylic copolymer (A) in addition to a macromonomer as a copolymer component of the (meth)acrylic copolymer (A). The case where the addition bonding component is contained and the like is contained as a structural unit other than the copolymer component. The photocurable composition preferably has a structure in which at least one of the crosslinking agent (B) and the crosslinking initiator (C) is bonded to the (meth)acrylic copolymer (A). If at least one of the crosslinking agent (B) and the crosslinking initiator (C) is bonded to the (meth)acrylic copolymer (A), the bonded crosslinking agent (B) or Exudation of the crosslinking initiator (C). Further, at least one of the crosslinking agent (B) and the crosslinking initiator (C) is bonded to the (meth)acrylic copolymer (A) to promote the reaction efficiency of the photocrosslinking reaction. A photocured material having a higher agglutination power can be obtained. Further, if at least one of the crosslinking agent (B) and the crosslinking initiator (C) is bonded to the (meth)acrylic copolymer (A), the (meth)acrylic acid can be deliberately designed. Since the copolymer (A) is crosslinked, it is easy to control the half value width of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement specified in the present invention. Here, the above "bonding with (meth)acrylic copolymer (A)" means a crosslinking agent (B) or a crosslinking initiator (C) and a (meth)acrylic copolymer (A). A state in which a bond is carried out by a chemical bond including a covalent bond, an ionic bond, and a metal bond. As described above, the present photohardenable composition is characterized by a half-value width X1 (nm) of one-dimensional scattering distribution in a small-angle X-ray scattering measurement. ^-1 ) is 0.05 < X1 < 0.30. The small-angle X-ray scattering measurement method is a method of obtaining structural information of a nanometer scale (1 to 100 nm) by observing scattered X-rays having a scattering angle of several degrees or less (specifically, for example, 10 or less). Therefore, a composition for observing a one-dimensional scattering distribution in a small-angle X-ray scattering measurement means a composition which is not a state in which a one-dimensional scattering distribution is not observed in a small-angle X-ray scattering measurement. Further, if a one-dimensional scattering distribution can be observed in the small-angle X-ray scattering measurement, the shape or state of the photocurable composition is not limited. The (meth)acrylic copolymer (A) in the photocurable composition contains a copolymer of a macromonomer as a structural unit. Generally, a copolymer of a macromonomer as a structural unit forms a graft copolymer or a block copolymer. When the polymerizable group of the macromonomer is one, it is usually a graft copolymer by addition, condensation or copolymerization with another monomer. Further, when the number of polymerizable groups of the macromonomer is two, it is usually a block copolymer by addition, condensation or copolymerization with another monomer. It is known that a general graft copolymer or block copolymer forms a (micro) phase separated structure. The half value width of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement of the present photocurable composition can be considered to be formed by the composition containing the (meth)acrylic copolymer (A) as described above. The standard of the "phase separation state" of the (micro) phase separation structure. That is, for example, the main component and the branch component in the graft copolymer or the block components in the block copolymer form a state in which the microseparation is different from the "phase". Here, in the case where the half-value width of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement is large (wider), it means that the peak is wider, meaning that the phase is smaller than the case where the half-value width is small. The difference in density difference between the separated phases or the phase separation structure is not uniform. On the other hand, the smaller the half-value width (the narrower), the steeper the peak, meaning that the difference in density of the phases separated by phase is more clear, or phase separation, compared to the case where the half-value width is large. The structure is more uniform. Therefore, in the present photocurable composition, by controlling the half value width to a specific range, the phases of the micro phase separation can each have different adhesion characteristics. Therefore, it can be regarded as a combination of features that are generally difficult to achieve at the same time. In the following description, the term "branched component" or "main component" is used, and a graft copolymer is used as an example. In the block copolymer, it is changed to "block". The component (for example, "block component A" or "block component B") may be used. From the viewpoint of the above, in the photocurable composition, the half value width X1 of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement can be set in the copolymer containing the macromonomer as a structural unit. And an indicator comprising a state in which the (micro)phase separation structure formed by the branching component of the macromonomer is changed by the designated crosslinking agent or photoinitiator. Therefore, in the photocurable composition, the photocurable composition as disclosed above, that is, the (meth)acrylic copolymer having a macromonomer as a structural unit, is copolymerized by 0.05 < X1 < 0.30. Compared with the previous photocurable composition of the material and the crosslinking agent, the adhesion and shape stability of the opposite physical properties can be simultaneously achieved at a higher level, and the effect of improving the handleability can be obtained. From this point of view, in the photocurable composition, it is preferred that the half value width X1 of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement is 0.05 < X1 < 0.30, and more preferably 0.06 < X1 therein. Or X1 < 0.27, wherein 0.08 < X1 or X1 < 0.25, and further wherein 0.11 < X1 or X1 ≦ 0.23. According to the above, the half value width X1 is preferably any one of 0.05 < X1 < 0.30, 0.05 < X1 < 0.27, 0.05 < X1 < 0.25 or 0.05 < X1 ≦ 0.23, more preferably 0.06 < X1 < 0.30, Any one of 0.06 < X1 < 0.27, 0.06 < X1 < 0.25 or 0.06 < X1 ≦ 0.23, and further preferably wherein 0.08 < X1 < 0.30, 0.08 < X1 < 0.27, 0.08 < X1 < 0.25 or 0.08 < X1 ≦ Any one of 0.23 is preferably any one of 0.11 < X1 < 0.30, 0.11 < X1 < 0.27, 0.11 < X1 < 0.25 or 0.11 < X1 ≦ 0.23. In the present photocurable composition, as a main method for adjusting the half value width X1 of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement, (meth)acrylic copolymerization as a base polymer is exemplified. The structure or composition of the substance (A), the molecular weight, and the like are adjusted, and the type and amount of the crosslinking agent (B) or the crosslinking initiator (C) are adjusted or selected. However, it is not limited to this method. In addition, the "base polymer" means the main component contained in the photocurable composition, and the "main component" means a component which is contained in excess of 40% by mass of the photocurable composition. Here, the selection of the structure of the (meth)acrylic copolymer (A) may, for example, be a graft copolymer or a block copolymer. The adjustment of the composition of the (meth)acrylic copolymer (A) can be adjusted by adjusting the composition of the main component and the branched component (in the case of a block copolymer, each block component). Specifically, the phase of the branch component based on the (meth)acrylic copolymer (A), the glass transition temperature (Tg) of the phase based on the trunk component, or the compatibility parameter of the branch component and the stem component are adjusted. The balance is optimized, or the balance between the hydrophilicity and the hydrophobicity of the branch component and the trunk component is optimized, whereby the above-mentioned half-value width can also be controlled. For example, the half-value width can be controlled by forming a phase having a higher Tg by the branching component and forming a phase having a lower Tg by the trunk component. As described above, the graft polymer is used to optimize the balance between the compatibility of the branch component and the main component, thereby controlling the half value width to form an optimum phase separation state, which is both viscous and hot melt. Sex. The adjustment of the type of the crosslinking agent (B) or the crosslinking initiator (C) is, for example, adjusted to the compatibility with the hydrophilic component constituting the (meth)acrylic copolymer (A). The crosslinking agent (B) or the crosslinking initiator (C) is a main component and a branching component for forming the (meth)acrylic copolymer (A) (in the case of a block copolymer, each is The component having a high compatibility with any one or both of the block components, or adjusting the addition amount, thereby adjusting the main component and the branch component of the (meth)acrylic copolymer (A) (The compatibility of each block component in the case of a block copolymer) controls the phase separation state, that is, the half value width of the one-dimensional scattering distribution. In the method of adjusting the half value width X1 of the photocurable composition, it is effective to use the type of the functional group or the content ratio of the monomer constituting the main component and the branch component as follows. Optimizing the molecular weight of the branched component or optimizing the molecular weight of the branched component to optimize the (meth)acrylic copolymer (A), and performing the crosslinking agent (B) or the crosslinking initiator (C) And the amount of adjustment. Further, in the present photocurable composition, in order to adjust the half value width X1 to a preferred range, as described below, for example, it is preferable to use a carbon number of 5 or more, 8 or more of them, and 9 of them. The above (especially 10 or more) (meth)acrylic monomer or vinyl monomer is the main copolymerization component (main component) of (1) (meth)acrylic copolymer (A). Specifically, it is preferably selected from the examples of the monomers contained in the main component of the acrylic copolymer (A1) described below. Further, it is preferred to use a hydrophilic component as the (2a) the above-mentioned (meth)acrylic monomer or the above-mentioned copolymerizable component (main component) other than the vinyl monomer. Specifically, it is preferably selected from the examples of the hydrophilic monomer contained in the main component of the following acrylic copolymer (A1). Furthermore, it is preferable to contain (2b) the hydrophilic component in a mass ratio of 0.1 to 20 with respect to the copolymerization component (main component) 100, and to improve the hydrophilicity of the trunk component. Furthermore, it is preferable to mix (4) of the carbon number of 4 or less as a branching component of the (3a) (meth)acrylic-type copolymer (A) with the mass ratio of 1 to 100 with respect to the trunk component 100. The acrylic monomer or the vinyl monomer component adjusts the microphase separation state formed by the phase of the stem component and the branch component. In addition, it is preferable that the branching component of the (3b) (meth)acrylic copolymer (A) is a (meth) group having a cyclic structure so as to have a mass ratio of from 1 to 100 with respect to the trunk component 100. The acrylic monomer or the vinyl monomer component adjusts the microphase separation state formed by the phase of the stem component and the branch component. Further, it is preferred to use a hydroxyl group-containing compound or the like having a high compatibility with a hydrophilic component as the (4a) crosslinking agent (B). Specifically, it is preferably selected from the following examples of the crosslinking agent (B). Furthermore, it is preferable to add 0.05 to 30 parts by mass of (4b) of the above-mentioned crosslinking agent (B) to 100 parts by mass of the (meth)acryl-based copolymer, and to appropriately adjust the polarity of the phase containing the main component. As described above, by appropriately selecting the above (1) to (4b) independently, the phase separation structure formed by the trunk component and the branch component can be adjusted. Wherein, in the methods (1) to (4b) above, it is preferred to combine (1) and (2a) and/or (2b), or combine (1) with (3a) and/or (3b), Preferably, all of the methods (1) to (4b) are employed in combination (1), (3a) and/or (3b) and (4a) and/or (4b). However, it is not limited to this method. As described above, it is only necessary to use a graft polymer to optimize the balance between the compatibility of the branch component and the trunk component, thereby forming an optimum phase separation state. The hydrophobic component is used as a main copolymerizable component (main component) of the copolymer (A), and a hydrophilic component is used as a branch component of the copolymer (B), whereby the half value width X1 is controlled. The photocurable composition is further preferably irradiated with an accumulated light irradiation amount of 4000 mJ/m. ² Half-value width of one-dimensional scattering distribution in small-angle X-ray scattering measurement at the time of light X2 (nm ^-1 ) is 0.05 < X2 < 0.25. In the photocurable composition, the cumulative light irradiation amount by irradiation is 4000 mJ/m ² The one-dimensional scattering distribution of the light, that is, the half-value width of the one-dimensional scattering distribution of the photohardenable composition after the irradiation of light is X2 (nm ^-1 When it is 0.05 < X2 < 0.25, in addition to the effect when X1 is in a specific range, the effect of obtaining a high cohesive force in the composition after photocuring can be further obtained. The wavelength of the irradiation light is preferably the wavelength induced by the crosslinking initiator (C) described below. From this point of view, in the present photocurable composition, it is preferred that the irradiation cumulative light irradiation amount is 4000 mJ/m. ² Half-value width of one-dimensional scattering distribution in small-angle X-ray scattering measurement at the time of light X2 (nm ^-1 ) is 0.05 < X2 < 0.25, and further preferably 0.06 < X2 or X2 < 0.24, wherein 0.08 < X2 or X2 < 0.22, and further wherein 0.10 < X2 or X2 < 0.20. According to the above, the half value width X2 is preferably any one of 0.05<X2<0.25, 0.05<X2<0.24, 0.05<X2<0.22 or 0.05<X2<0.20, more preferably 0.06<X2<0.25, Any one of 0.06 < X2 < 0.24, 0.06 < X2 < 0.22 or 0.06 < X2 < 0.20, and further preferably wherein 0.08 < X2 < 0.25, 0.08 < X2 < 0.24, 0.08 < X2 < 0.22 or 0.08 < X2 < Any one of 0.20 is preferably any one of 0.10 < X2 < 0.25, 0.10 < X2 < 0.24, 0.10 < X2 < 0.22, or 0.10 < X2 < 0.20. In the present photocurable composition, the irradiation amount of the cumulative illumination is adjusted to 4000 mJ/m. ² Half-value width of one-dimensional scattering distribution in small-angle X-ray scattering measurement at the time of light X2 (nm ^-1 The method is the same as the method for adjusting the above-mentioned half value width X1. For example, the structure, composition, molecular weight, and the like of the (meth)acrylic copolymer (A) as a base polymer may be adjusted, and the type of the crosslinking agent (B) or the crosslinking initiator (C) may be mentioned. And the method of adjusting or selecting the quantity. However, it is not limited to this method. Further, in the present photocurable composition, in order to adjust the half value width X2 to a preferred range, as described below, it is preferable to use a carbon number of 5 or more, 8 or more thereof, or 9 or more thereof. In particular, a (meth)acrylic monomer or a vinyl monomer of 10 or more is the main copolymerization component (main component) of the (1) (meth)acrylic copolymer (A). Specifically, it is preferably selected from the examples of the monomers contained in the main component of the acrylic copolymer (A1) described below. Further, it is preferred to use a hydrophilic component as the (2a) the above-mentioned (meth)acrylic monomer or the above-mentioned copolymerization component (main component) other than the vinyl monomer. Specifically, it is preferably selected from the examples of the hydrophilic monomer contained in the main component of the following acrylic copolymer (A1). Furthermore, it is preferable to contain (2b) the hydrophilic component in a mass ratio of 0.1 to 20 with respect to the copolymerization component (main component) 100, and to improve the hydrophilicity of the trunk component. Furthermore, it is preferable to mix (4) of the carbon number of 4 or less as a branching component of the (3a) (meth)acrylic-type copolymer (A) with the mass ratio of 1 to 100 with respect to the trunk component 100. The acrylic monomer or the vinyl monomer component adjusts the microphase separation state formed by the phase of the stem component and the branch component. In addition, it is preferable that the branching component of the (3b) (meth)acrylic copolymer (A) is a (meth) group having a cyclic structure so as to have a mass ratio of from 1 to 100 with respect to the trunk component 100. The acrylic monomer or the vinyl monomer component adjusts the microphase separation state formed by the phase of the stem component and the branch component. Further, it is preferred to use a hydroxyl group-containing compound or the like having a high compatibility with a hydrophilic component as the (4a) crosslinking agent (B). Specifically, it is preferably selected from the following examples of the crosslinking agent (B). Furthermore, it is preferable to add 0.05 to 30 parts by mass of (4b) of the above-mentioned crosslinking agent (B) to 100 parts by mass of the (meth)acryl-based copolymer, and to appropriately adjust the polarity of the phase containing the main component. As described above, by appropriately selecting the above (1) to (4b) independently, the phase separation structure formed by the trunk component and the branch component can be adjusted. Wherein, in the methods (1) to (4b) above, it is preferred to combine (1) and (2a) and/or (2b), or combine (1) with (3a) and/or (3b), Preferably, all of the methods (1) to (4b) are employed in combination (1), (3a) and/or (3b) and (4a) and/or (4b). However, it is not limited to this method. As described above, it is only necessary to use a graft polymer to optimize the balance between the compatibility of the branch component and the trunk component, thereby forming an optimum phase separation state. The hydrophobic component is used as a main copolymerizable component (main component) of the copolymer (A), and a hydrophilic component is used as a branch component of the copolymer (B), whereby the half value width X2 is controlled. Further, as described above, the shape or state of the photocurable composition is not limited. Uniformly irradiating the above-mentioned 4000 mJ/m to the photocurable composition ² In the case of the light, the photocurable composition may be formed into a sheet having a thickness of 150 μm as a reference (measurement target). The photocurable composition preferably has a property of exhibiting adhesiveness at 20 ° C and softening or fluidizing at 50 to 100 ° C. As described above, the present photocurable composition can have such a property by using the following (meth)acrylic copolymer (A1) as a base resin. <(Meth)acrylic copolymer (A)> As the (meth)acrylic copolymer (A) containing a macromonomer as a structural unit, a graft copolymer containing a macromonomer as a branching component is exemplified. The (meth)acrylic copolymer (A1) is taken as an example. Since the photocurable composition is crosslinked by the action of the crosslinking agent (B) and the crosslinking initiator (C), the (meth)acrylic copolymer (A) is used in terms of efficiency. ) is preferably a graft copolymer. When the photocurable composition is prepared using the (meth)acrylic copolymer (A1) as a base resin, it is easy to control the half value width of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement defined in the present invention. . That is, the half value width is set to one of the ways of achieving the range. Therefore, the photocurable composition can maintain a specific shape, for example, a sheet shape at room temperature, and exhibits self-adhesiveness (self-adhesiveness), and has a heat which softens or flows if heated in an uncrosslinked state. The meltability, in addition, can be hardened by light, and after photohardening, it can exhibit excellent cohesive force and be followed. Therefore, when the (meth)acrylic copolymer (A1) is used as the base polymer of the photocurable composition, it is possible to exhibit adhesiveness at room temperature (20 ° C) even in an uncrosslinked state. And if it is heated to a temperature of 50 to 90 ° C, more preferably 60 ° C or more or 80 ° C or less, the property is softened or fluidized. (Main component) The glass transition temperature of the (co)polymer constituting the main component of the (meth)acryl-based copolymer (A1) is preferably -70 to 0 °C. In this case, the glass transition temperature of the (co)polymer component constituting the trunk component means a glass transition of a polymer obtained by polymerizing only the monomer component constituting the trunk component of the (meth)acrylic copolymer (A1). temperature. Specifically, it means the value calculated by the calculation formula of Fox based on the glass transition temperature and the composition ratio of the polymer obtained from the homopolymer of each component of the (co)polymer. Further, the polymer containing only the main component may be either a homopolymer or a copolymer. Further, the calculation formula of Fox is as follows, and can be obtained by using the values described in the Polymer Handbook [Polymer HandBook, J. Brandrup, Interscience, 1989]. 1/(273+Tg)=Σ(Wi/(273+Tgi)) [wherein, Wi represents the weight fraction of monomer i, and Tgi represents the Tg (°C) of the homopolymer of monomer i] constitutes the above (meth)acrylic acid The glass transition temperature of the (co)polymer of the main component of the copolymer (A1) affects the softness of the photohardenable composition at room temperature or the wetting of the adherend by the photocurable composition. The glass transition temperature is preferably -70 ° C to 0 ° C, and particularly preferably -65, in order to obtain a moderate adhesion (viscosity) of the photocurable composition at room temperature. Above °C or below -5 °C, wherein -60 °C or above or -10 °C. However, even if the glass transition temperature of the (co)polymer is the same temperature, the viscoelasticity can be adjusted by adjusting the molecular weight. For example, by making the molecular weight of the trunk component small, it can be further softened. The monomer contained in the main component of the (meth)acrylic copolymer (A1) may, for example, be a (meth) acrylate monomer, and examples thereof include methyl (meth) acrylate and (meth) acrylate. Ethyl ester, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, dibutyl (meth) acrylate, (A) Base) butyl acrylate, amyl (meth) acrylate, isoamyl (meth) acrylate, neopentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate , (heptyl)methacrylate, 2-ethylhexyl acrylate, n-octyl acrylate, isooctyl acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, (meth) acrylate Tributylcyclohexyl ester, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate Ester, stearyl (meth) acrylate, isostearyl (meth) acrylate, behenyl (meth) acrylate, isodecyl (meth) acrylate, 2-phenoxy (meth) acrylate Ethyl ester , 3,5,5-trimethylcyclohexane acrylate, p-cumylphenol oxirane modified (meth) acrylate, dicyclopentanyl (meth) acrylate, (meth) acrylate Dicyclopentenyl ester, dicyclopentenyloxyethyl (meth)acrylate, benzyl (meth)acrylate, and the like. Further, it is also possible to use hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, and hydroxybutyl (meth)acrylate in which the (meth) acrylate monomer is bonded to a hydrophilic group. A hydroxyl group-containing (meth)acrylate such as (meth)acrylic acid acrylate. Further, (meth)acrylic acid, 2-(meth)acryloyloxyethylhexahydrophthalic acid, 2-(methyl)acryloxypropylhexahydrophthalic acid, 2 -(Meth)propylene methoxyethyl phthalate, 2-(methyl) propylene methoxy propyl phthalate, 2-(methyl) propylene methoxyethyl maleate , 2-(methyl)propenyloxypropyl maleic acid, 2-(meth)acryloxyethyl succinic acid, 2-(methyl) propylene methoxy succinic acid a carboxyl group-containing monomer such as crotonic acid, fumaric acid, maleic acid, itaconic acid, monomethyl maleate or monomethyl meconate. Further, an acid anhydride group-containing monomer such as maleic anhydride or itaconic acid anhydride; glycidyl (meth)acrylate, glycidyl α-ethyl acrylate, or 3,4-epoxy (meth)acrylate may be used. An amine group-containing (meth) acrylate monomer such as an epoxy group-containing monomer such as butyl ester or dimethylaminoethyl (meth) acrylate or diethylaminoethyl (meth) acrylate; Methyl) acrylamide, dimethyl (meth) acrylamide, diethyl (meth) acrylamide, (meth) propylene decyl porphyrin, hydroxyethyl (meth) acrylamide, Isopropyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide-chloromethane, (meth) propylene Indoleamine, N-tert-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxy a acrylamide-based monomer such as methyl (meth) acrylamide or diacetone (meth) acrylamide; a guanamine-containing monomer such as maleic acid or maleimide; a heterocyclic basic monomer such as vinylpyrrolidone, vinylpyridine or vinylcarbazole; (methyl) 2-isocyanatoethyl enoate, 2-(2-(methyl)propenyloxyethoxy)ethyl isocyanate, 2-(0-[1'-methyl)(meth)acrylate Isopropylamino]carboxyamino)ethyl ester, 2-[(3,5-dimethylpyrazolyl)carbonylamino](meth)acrylate, etc., containing isocyanate or blocked isocyanate Acid-based monomer; 2-[2-hydroxy-5-[2-((meth)propenyloxy)ethyl]phenyl]-2H-benzotriazole and other monomers containing ultraviolet absorbing groups Wait. Further, styrene, tert-butyl styrene, α-methyl styrene, vinyl toluene, acrylonitrile, methyl group copolymerizable with the above acrylic monomer or methacrylic monomer may be suitably used. Various vinyl monomers such as acrylonitrile, vinyl acetate, vinyl propionate, alkyl vinyl ether, hydroxyalkyl vinyl ether, and alkyl vinyl monomer. Further, the main component of the (meth)acrylic copolymer (A1) is preferably a monomer having a hydrophobicity and a hydrophilic monomer as a structural unit. When the main component of the (meth)acrylic copolymer (A1) contains only a hydrophobic monomer, wet heat whitening tends to occur. Therefore, it is preferred to introduce a hydrophilic monomer into the main component to prevent wet heat whitening. Specifically, examples of the main component of the (meth)acrylic copolymer (A1) include a hydrophobic (meth) acrylate monomer, a hydrophilic (meth) acrylate monomer, and a giant single. A copolymer component obtained by randomly copolymerizing a polymerizable functional group at the end of the body. Here, examples of the hydrophobic (meth) acrylate monomer include ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, and (methyl). ) n-butyl acrylate, isobutyl (meth)acrylate, second butyl (meth)acrylate, tert-butyl (meth)acrylate, amyl (meth)acrylate, isoamyl (meth)acrylate Ester, neopentyl (meth)acrylate, hexyl (meth)acrylate, cyclohexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, acrylic acid Isooctyl ester, decyl (meth) acrylate, isodecyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate , undecyl (meth)acrylate, lauryl (meth)acrylate, cetyl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, (A) Base) behenyl acrylate, isodecyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, methyl methacrylate. Further, examples of the hydrophobic vinyl monomer include alkyl vinyl esters such as vinyl acetate, styrene, t-butyl styrene, α-methyl styrene, vinyl toluene, and alkyl vinyl monomers. Wait. Among them, from the viewpoint of easily forming a phase separation structure with a phase formed by the following branch components and imparting an appropriate adhesion (viscosity) to the photocurable composition, the carbon number is preferably 5 or more, 8 or more thereof, 9 or more thereof, particularly 10 or more alkyl (meth)acrylates. For example, when a photo-curable composition is used for a member having a touch sensor function, in order to absorb the change in touch sensitivity, the noise of the detection signal is suppressed, and a light having a relatively low dielectric constant is sought. The case of a hardenable composition. In this case, it is preferable to use the carbon number from the viewpoint of adjusting the relative dielectric constant of the photocurable composition and/or the cured product obtained by photocuring the photocurable composition to be low. 5 or more, 8 or more thereof, 9 or more thereof, particularly 10 or more alkyl (meth)acrylates are used as the hydrophobic monomer. Here, examples of the (meth)acrylic acid alkyl ester having 8 or more carbon atoms include 2-ethylhexyl acrylate, n-octyl acrylate, isooctyl acrylate, and decyl (meth)acrylate. Isodecyl acrylate, tert-butylcyclohexyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, (A) Lauryl acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate, behenyl (meth) acrylate, isophthalic acid (meth) acrylate A base ester, cyclohexyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, or the like. As the above hydrophilic monomer, for example, methyl acrylate, tetrahydrofurfuryl (meth) acrylate, or hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate a hydroxyl group-containing (meth) acrylate such as an ester or a glyceryl (meth) acrylate; (meth)acrylic acid, 2-(meth)acryloxyethyl hexahydrophthalic acid, 2-(methyl) Propylene methoxypropyl hexahydrophthalic acid, 2-(meth) propylene methoxyethyl phthalate, 2-(methyl) propylene methoxy propyl phthalate, 2-( Methyl)propenyloxyethyl maleic acid, 2-(methyl)acryloxypropyl maleic acid, 2-(methyl)acryloxyethyl succinic acid, 2 -(Methyl)acryloxypropyl succinic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid, monomethyl maleate, monomethyl meconate a carboxyl group-containing monomer; an acid anhydride group-containing monomer such as maleic anhydride or itaconic anhydride; glycidyl (meth)acrylate, glycidyl α-ethyl acrylate, 3,4-cyclo(meth)acrylate Butyloxy monomer such as oxybutyl ester; methoxy polyethylene glycol (A In addition to alkoxy polyalkylene glycol (meth) acrylates such as acrylates, (meth) acrylamide, dimethyl (meth) acrylamide, diethyl (methyl) may also be used. ) acrylamide, (meth) propylene decyl porphyrin, hydroxyethyl (meth) acrylamide, isopropyl (meth) acrylamide, dimethylaminopropyl (meth) propylene oxime Amine, phenyl (meth) acrylamide, N-tert-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (methyl) A (meth) acrylamide-based monomer such as acrylamide, N-butoxymethyl (meth) acrylamide or diacetone (meth) acrylamide. In the above, from the viewpoint of preventing the wet heat whitening of the photocurable composition and improving the adhesion to the adherend, it is preferred to use a hydroxyl group-containing monomer, a carboxyl group-containing monomer, or an acid anhydride group-containing monomer. A (meth)acrylamide monomer is used as the hydrophilic monomer. On the other hand, when the photocurable composition is used for a member having corrosive properties such as a metal or a metal oxide, in order to prevent the photocurable composition and/or the photocurable composition from being light-reducing It is preferable to use a hydrophilic component which does not contain a carboxyl group or an acid anhydride having a high acidity, because the cured hardened material is deteriorated by corrosion of the adherend. From such a viewpoint, as the hydrophilic monomer, for example, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, or (methyl) is preferably used. a hydroxyl group-containing (meth) acrylate such as glycerin acrylate; or (meth) acrylamide, dimethyl (meth) acrylamide, diethyl (meth) acrylamide, (meth) propylene oxime Basoxaline, hydroxyethyl (meth) acrylamide, isopropyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide, phenyl (meth) acrylamide , N-tert-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl A (meth) acrylamide-based monomer such as (meth) acrylamide or diacetone (meth) acrylamide. (Branching Component: Giant Monomer) The (meth)acrylic copolymer (A1) is preferably a branched component in which a macromonomer is introduced as a graft copolymer, and a macromonomer is contained as a structural unit. The macromonomer system has a polymerizable functional group at the end and a high molecular weight skeleton component. The glass transition temperature (Tg) of the macromonomer is preferably higher than the glass transition temperature of the copolymer component constituting the above (meth)acrylic copolymer (A1). Specifically, the glass transition temperature (Tg) of the macromonomer is preferably from 30 ° C to 120 ° C, and more preferably 40 ° C, since it affects the heat melting temperature (hot melt temperature) of the photohardenable composition. Above or below 110 ° C, of which 50 ° C or more or 100 ° C or less. When the macromonomer is such a glass transition temperature (Tg), it is possible to maintain excellent workability or storage stability by adjusting the molecular weight, and it can be adjusted by hot melt at a temperature of from 50 ° C to 80 ° C. The glass transition temperature of the macromonomer means the glass transition temperature of the macromonomer itself, which can be determined by a differential scanning calorimeter (DSC). Further, in order to maintain the physical cross-linking in the form of an adhesive composition such that the branch components are pulled from each other at room temperature, and by heating to a moderate temperature, the physical cross-linking can be obtained. The fluidity is also preferably adjusted to adjust the molecular weight or content of the macromonomer. In this regard, the macromonomer is preferably contained in the (meth)acrylic copolymer (A1) at a ratio of 5 to 30% by mass, preferably 6% by mass or more or 25% by mass or less. Among them, it is 8 mass% or more or 20 mass% or less. Further, the number average molecular weight of the macromonomer is preferably from 500 to 100,000, preferably less than 8,000, preferably 800 or more, or less than 7,500, or more than 1,000 or less than 7,000. The macromonomer can be suitably used by a general manufacturer (for example, a giant monomer manufactured by Toagosei Co., Ltd.). The high molecular weight skeleton component of the macromonomer preferably contains an acrylic polymer or a vinyl polymer. Examples of the high molecular weight skeleton component of the macromonomer include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, and isopropyl (meth)acrylate. Base) n-butyl acrylate, isobutyl (meth)acrylate, second butyl (meth)acrylate, tert-butyl (meth)acrylate, amyl (meth)acrylate, (meth)acrylic acid Amyl ester, neopentyl (meth)acrylate, hexyl (meth)acrylate, cyclohexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, Isooctyl acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, decyl (meth) acrylate, isophthalic acid (meth) acrylate Ester, undecyl (meth)acrylate, lauryl (meth)acrylate, cetyl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, ( Behenyl methacrylate, isodecyl (meth) acrylate, 2-phenoxyethyl (meth) acrylate, 3,5,5-trimethylcyclohexane acrylate, p-cumene Phenol ring Ethane modified (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, (methyl) Benzyl acrylate, hydroxyalkyl (meth) acrylate, (meth)acrylic acid, glycidyl (meth) acrylate, alkoxyalkyl (meth) acrylate, alkoxy polyalkylene glycol (meth) acrylate monomer such as (meth) acrylate; or styrene, t-butyl styrene, α-methyl styrene, vinyl toluene, alkyl vinyl monomer, alkyl vinyl ester, Various vinyl monomers such as alkyl vinyl ether, hydroxyalkyl vinyl ether, (meth)acrylonitrile, (meth) acrylamide, N-substituted (meth) acrylamide, etc., which may be used alone or in combination Two or more types are used. The macromonomer system has a radical polymerizable group or a polymerizable functional group such as a hydroxyl group, an isocyanato group, an epoxy group, a carboxyl group, an amine group, a decylamino group or a thiol group. As the macromonomer, a radical polymerizable group capable of copolymerizing with other monomers is preferred. The radical polymerizable group may contain one or two or more, and particularly preferably one. In the case where the macromonomer has a functional group, the functional group may also contain one or two or more, and particularly preferably one. Further, the radical polymerizable group and the functional group may contain either or both of them. In the case of containing both a radical polymerizable group and a functional group, any one of a functional group added to a polymer unit containing another monomer or a radical polymerizable group copolymerized with another monomer The functional group other than the one or the radical polymerizable group may be two or more. Therefore, examples of the terminal functional group of the macromonomer include a hydroxyl group, an isocyanate group, an epoxy group, and a carboxyl group, in addition to a radical polymerizable group such as a methacryl group, an acryl group or a vinyl group. a functional group such as an amine group, a guanylamino group or a thiol group. Among them, the terminal functional group of the macromonomer preferably has a radical polymerizable group capable of copolymerizing with another monomer. At this time, the radical polymerizable group may contain one or two or more, and particularly preferably one. In the case where the macromonomer has a functional group, the functional group may also contain one or two or more, and particularly preferably one. Further, the radical polymerizable group and the functional group may contain either or both of them. In the case of containing both a radical polymerizable group and a functional group, any one of a functional group added to a polymer unit containing another monomer or a radical polymerizable group copolymerized with another monomer The functional group other than the one or the radical polymerizable group may be two or more. Giant monomers can be produced by known methods. Examples of the method for producing the macromonomer include a method of producing a cobalt chain transfer agent, a method of using an α-substituted unsaturated compound such as an α-methylstyrene dimer as a chain transfer agent, and a method of using a polymerizable group. a method of bonding by chemical means; and a method by thermal decomposition. Among these methods, as a method for producing a macromonomer, a method of producing a catalyst using a cobalt chain transfer agent is preferred in terms of a catalyst having a small number of production steps and a high chain transfer constant. (Manufacturing Method) The acrylic copolymer (A1) can be obtained, for example, by adding a specific macromonomer (a) to a polymer containing the vinyl monomer (b), or by containing a specific macromonomer ( A) is obtained by polymerizing a monomer mixture of the vinyl monomer (b). <Crosslinking agent (B)> The crosslinking agent (B) in the photocurable composition has control of a (micro) phase separation structure formed as a composition containing the (meth)acrylic copolymer (A) The action of the agent, in other words, has the function of adjusting the softness and cohesive force of the photocurable composition. The crosslinking agent (B) may, for example, be selected from the group consisting of (meth)acryl fluorenyl group, epoxy group, isocyanate group, carboxyl group, hydroxyl group, carbodiimide group, oxazoline group, aziridine. A crosslinking agent capable of using at least one crosslinkable functional group of a group, a vinyl group, an amine group, an imido group, a decylamino group, an N-substituted (meth) acrylamide group, or an alkoxyalkyl group One type or a combination of two or more types is used. Further, the above crosslinkable functional group can be protected by a protecting group which can be deprotected. Among them, a polyfunctional (meth) acrylate is preferred from the viewpoint of easily controlling the crosslinking reaction. As such a polyfunctional (meth) acrylate, for example, 1,4-butanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, glycerol di(meth)acrylate, Glycerol glycidyl ether di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, tricyclodecane dimethanol di Methyl) acrylate, bisphenol A polyethoxy di(meth) acrylate, bisphenol A polyalkoxy di(meth) acrylate, bisphenol F polyalkoxy di(meth) acrylate , polyalkylene glycol di(meth)acrylate, trimethylolpropane trioxyethyl (meth) acrylate, ε-caprolactone modified tris(2-hydroxyethyl)isocyanuric acid Tris(meth)acrylate, pentaerythritol tri(meth)acrylate, propoxylated pentaerythritol tri(meth)acrylate, ethoxylated pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylic acid Ester, propoxylated pentaerythritol tetra(meth)acrylate, ethoxylated pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, polyethylene glycol di(meth)acrylate, Tris(propylene methoxyethyl) cyanurate, pentaerythritol tetra(meth) acrylate, dipentaerythritol hexa(meth) acrylate, dipentaerythritol penta (meth) acrylate, tripentaerythritol hexa(meth) acrylate Ester, tripentaerythritol penta (meth) acrylate, hydroxypivalic acid neopentyl glycol di(meth) acrylate, hydroxypivalic acid neopentyl glycol ester ε-caprolactone adduct Methyl) acrylate, trimethylolpropane tri(meth) acrylate, alkoxylated trimethylolpropane tri(meth) acrylate, bis(trimethylolpropane) tetra(meth)acrylic acid Examples of the ultraviolet curable polyfunctional monomer such as an ester include (meth)acrylic polyester, epoxy (meth)acrylate, (meth)acrylic acid urethane, and polyether (meth)acrylic acid. A polyfunctional acrylate oligomer such as an ester, and a polyfunctional acrylamide or the like. In the above-mentioned polyfunctional (meth) acrylate monomer, it is preferable to contain a hydroxyl group, a carboxyl group, and an amine group from the viewpoint of the effect of the adhesion of the adherend or the suppression of the moist heat whitening. a polyfunctional monomer or oligomer of a polar functional group such as a guanamine group. Among them, a polyfunctional (meth) acrylate having a hydroxyl group or a guanamine group is preferably used. From the viewpoint of preventing wet heat whitening, a hydrophobic acrylate monomer and a hydrophilic acrylate monomer are preferably used as the main component of the (meth) acrylate copolymer (A1), that is, a graft copolymer. Further, it is preferred to use a polyfunctional (meth) acrylate having a hydroxyl group as the crosslinking agent (B). Further, in order to adjust the effects of adhesion, heat and humidity resistance, heat resistance, and the like, a monofunctional or polyfunctional (meth) acrylate which is reacted with the crosslinking agent (B) may be further added. Further, as a crosslinking agent having two or more kinds of crosslinkable functional groups, for example, glycidyl (meth)acrylate, glycidyl α-ethyl acrylate, and 3,4-epoxybutyl (meth)acrylate An epoxy group-containing monomer such as an ester or a 4-hydroxybutyl (meth)acrylate glycidyl ether; or 2-isocyanatoethyl (meth)acrylate or 2-(2-(methyl) isocyanate) Propylene methoxyethoxy)ethyl ester, 2-(O-[1'-methylpropyleneamino]carboxyamino)ethyl (meth)acrylate, 2-[(3) Other than a monomer containing an isocyanate group or a blocked isocyanate group, such as 5-dimethylpyrazolyl)carbonylamino]ethyl ester, vinyl trimethoxymethane, vinyl triethyl Oxymethane, 3-glycidoxypropyltrimethoxymethane, 3-(methyl)propenyloxypropylmethyldiethoxymethane, 3-(methyl)propenyloxy Propyltriethoxymethane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxymethane, 3-isocyanatopropyltriethoxymethane, etc. Various decane coupling agents. The crosslinking agent having two or more kinds of crosslinkable functional groups may be reacted with a (meth)acrylic copolymer to form a crosslinkable functional group with a (meth)acrylic copolymer (A) bond. The structure of the knot. By bonding the crosslinking agent (B) to the (meth)acrylic copolymer (A), the bleeding of the crosslinking agent (B) or the unexpected plasticization of the adhesive composition can be suppressed. Moreover, by bonding the crosslinking agent (B) and the (meth)acrylic copolymer (A), the reaction efficiency of the photocrosslinking reaction is promoted, so that a cured product having a higher cohesive force can be obtained. The half-value width of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement is adjusted to an appropriate range to maintain an appropriate phase-separated structure, and the softness and cohesive force of the photo-curable composition are balanced. The content of the crosslinking agent (B) is preferably 0.05 parts by mass or 30 parts by mass based on 100 parts by mass of the above (meth)acrylic copolymer (A), and preferably 0.1 part by mass or 20 parts by mass. The ratio is particularly preferably 0.5 parts by mass or more or 15 parts by mass or less, particularly 1 part by mass or more or 13 parts by mass or less. The photocurable composition may further contain a monofunctional monomer that reacts with a crosslinkable functional group of the crosslinking agent (B). By adding a monofunctional monomer, in addition to increasing the value of the half value width X1 of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement of the photocurable composition, or increasing the fluidity during hot melt, Improve the adhesion to the adherend, or enhance the effect of moist heat whitening inhibition. Examples of such a monofunctional monomer include, in addition to alkyl (meth)acrylate such as methyl acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, and (methyl). Hydroxy-containing (meth) acrylate such as hydroxybutyl acrylate, glyceryl (meth) acrylate, or polyalkylene glycol (meth) acrylate; (meth)acrylic acid, 2-(methyl) propylene oxime Ethyl hexahydrophthalic acid, 2-(methyl) propylene methoxypropyl hexahydrophthalic acid, 2-(methyl) propylene methoxyethyl phthalate, 2-(A Base) propylene methoxy propyl phthalate, 2-(meth) propylene oxiranyl ethyl maleate, 2-(methyl) propylene methoxy propyl maleic acid, 2 -(Methyl)acryloxyethyl succinic acid, 2-(methyl) propylene methoxy succinic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid a carboxyl group-containing monomer such as monomethyl maleate or monomethyl meconate; an acid anhydride group-containing monomer such as maleic anhydride or itaconic acid anhydride; tetrahydrofurfuryl (meth)acrylate, methoxy Ether-containing (meth) propylene such as polyethylene glycol (meth) acrylate Ester; (meth) acrylamide, dimethyl (meth) acrylamide, diethyl (meth) acrylamide, (meth) propylene decyl porphyrin, hydroxyethyl (meth) propylene Indoleamine, isopropyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide, phenyl (meth) acrylamide, N-tert-butyl (meth) propylene Indoleamine, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, diacetone (A (meth) acrylamide-based monomer such as acrylamide. Among them, from the viewpoint of improving the adhesion to the adherend or the effect of suppressing the wet heat whitening, it is preferred to use a hydroxyl group-containing (meth) acrylate or a (meth) acrylamide monomer. <Crosslinking initiator (C)> The crosslinking initiator (C) used in the photocurable composition functions as a reaction initiation aid in the crosslinking reaction of the crosslinking agent (B). The cross-linking initiator can be suitably used by those currently known. Among them, from the viewpoint of easily controlling the crosslinking reaction, a photopolymerization initiator which induces ultraviolet rays having a wavelength of 380 nm or less is preferable. On the other hand, the photopolymerization initiator which induces light having a longer wavelength than the wavelength of 380 nm can obtain a higher photoreactivity, and when the photocurable composition is formed into a sheet shape, the light is induced. It is preferable to easily reach the deep part of the sheet. The photopolymerization initiator is roughly classified into two types according to a radical generating mechanism, and is roughly classified into a split-bond type photopolymerization initiator which can decompose a single bond of a photopolymerization initiator itself to generate a radical; The excited initiator and the hydrogen donor in the system form an excitation complex, and a hydrogen-trapping photopolymerization initiator capable of transferring hydrogen to the hydrogen. Among these, the cleavage-type photopolymerization initiator is decomposed into a further compound when a radical is generated by light irradiation, and does not have a function as a crosslinking initiator when excited. Therefore, it is preferable that the adhesive material does not remain as an active species in the adhesive material after the completion of the crosslinking reaction, and there is no possibility of causing undesired photodegradation or the like to the adhesive material. On the other hand, when the hydrogen abstraction photopolymerization initiator is reacted by a radical which is irradiated with an active energy ray such as ultraviolet rays, a decomposition product such as a bond-type photopolymerization initiator is not generated, and thus the reaction is completed. It is not easy to be a volatile component afterwards, and it can reduce the damage to the adherend, which is useful in this respect. Examples of the above-mentioned fragmentation type photopolymerization initiator include 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxycyclohexyl phenyl ketone, and 2-hydroxyl group. -2-methyl-1-phenyl-propan-1-one, 1-(4-(2-hydroxyethoxy)phenyl)-2-hydroxy-2-methyl-1-propan-1-one , 2-hydroxy-1-[4-{4-(2-hydroxy-2-methyl-propenyl)benzyl}phenyl]-2-methyl-propan-1-one, oligomeric (2- Hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone), methyl phenylglyoxylate, 2-benzyl-2-dimethylamino-1-( 4-Phenylphenylphenylbutane-1-one, 2-(4-methylbenzyl)-2-dimethylamino-1-(4-indolyl)phenyl)butane-1 -ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-indolyl propan-1-one, 2-(dimethylamino)-2-[(4-A) Phenyl)methyl]-1-[4-(4-carbolinyl)phenyl]-1-butanone, 1,2-octanedione, 1-(4-(phenylthio)-,2 -(o-benzamide), 1-[9-ethyl-6-(2-methylbenzhydryl)-9H-indazol-3-yl]-ethanone 1-(O-acetamidine)肟), bis(2,4,6-trimethylbenzylidene)-phenylphosphine oxide, 2,4,6-trimethylbenzhydryldiphenylphosphine oxide, (2,4,6 -trimethylbenzhydryl)ethoxyphenylphosphine oxide, double (2,6 -Dimethoxybenzylidene) 2,4,4-trimethylpentylphosphine oxide, or such derivatives. Examples of the hydrogen abstraction type photopolymerization initiator include benzophenone, 4-methyl-benzophenone, 2,4,6-trimethylbenzophenone, and 4-phenyldiphenyl. Methyl ketone, 3,3'-dimethyl-4-methoxybenzophenone, 4-(methyl) propylene decyl benzophenone, 4-[2-((meth) propylene oxime) Ethyl] benzophenone, 4-(methyl)propenyloxy-4'-methoxybenzophenone, methyl 2-benzimidazole, methyl benzhydrazide, Bis(2-phenyl-2-oxo-oxyacetic acid) oxydivinyl, 4-(1,3-propenyl fluorenyl-1,4,7,10,13-penta-oxytridecyl)benzophenone 9-oxosulfur 2-chloro 9-oxosulfur 3-methyl 9-oxosulfur 2,4-dimethyl 9-oxosulfur , hydrazine, 2-methyl hydrazine, 2-ethyl hydrazine, 2-tert-butyl hydrazine, 2-amino hydrazine, camphorquinone or a derivative thereof. However, the photopolymerization initiator is not limited to the above-exemplified substances. Any one of the above-mentioned photopolymerization initiators or a derivative thereof may be used, or two or more types may be used in combination. Among them, bis(2,4,6-trimethylbenzylidene)-phenylphosphine oxide is preferred because it is highly inductive to light and decolorizes as a decomposition product after the reaction. 2,4,6-trimethylbenzimidyldiphenylphosphine oxide, (2,4,6-trimethylbenzylidene)ethoxyphenylphosphine oxide, bis(2,6-dimethyl A fluorenylphosphine-based photopolymerization initiator such as oxybenzylidene) 2,4,4-trimethylpentylphosphine oxide. Further, it is easy to control the reaction and the compatibility with the acrylic copolymer containing a graft copolymer having a macromonomer as a branching component, and it is preferred to use diphenyl as a crosslinking initiator (C). Methyl ketone, 4-methyl-benzophenone, 2,4,6-trimethylbenzophenone, 4-phenylbenzophenone, 3,3'-dimethyl-4-methoxy Benzophenone, 4-(methyl) propylene decyl benzophenone, 4-[2-((meth) propylene methoxy) ethoxy] benzophenone, 4-(methyl) Propylene 醯oxy-4'-methoxybenzophenone, methyl 2-benzimidazole, methyl benzoic acidcarboxylate, and the like. The content of the crosslinking initiator (C) is not particularly limited. The standard is preferably contained in an amount of 0.1 to 10 parts by mass, 0.5 part by mass or more, or 5 parts by mass or less, or 1 part by mass or more, or 3 parts by mass or less based on 100 parts by mass of the acrylic copolymer (A). . By setting the content of the crosslinking initiator (C) to the above range, a moderate reaction sensitivity to the active energy ray can be obtained. Further, a sensitizer may be used in addition to the crosslinking initiator (C) component. The sensitizer is not particularly limited, and any sensitizer used in the photopolymerization initiator can be used without any problem. For example, an aromatic amine or an anthracene derivative, an anthracene derivative, a coumarin derivative, and 9-oxysulfur Derivatives, phthalocyanine derivatives, etc., or benzophenone, anthrone, 9-oxosulfur , aromatic ketones such as mazinone, 9,10-phenanthrenequinone, and the like. <Other Components> The photocurable composition may contain a known component formulated in a usual adhesive composition as a component other than the above. For example, various additives such as an adhesion-imparting resin, an antioxidant, a light stabilizer, a metal deactivator, a rust preventive, an anti-aging agent, a moisture absorbent, a water repellent, an antistatic agent, an antifoaming agent, and an inorganic particle may be appropriately contained. . Further, a reaction catalyst (a tertiary amine compound, a quaternary ammonium compound, a lauric acid compound, etc.) may be appropriately contained as needed. <This Adhesive Sheet> An adhesive sheet (referred to as "this adhesive sheet") can be produced from the present photocurable composition. The adhesive sheet may be a sheet containing a single layer or a multilayer sheet formed by laminating two or more layers. In the case where the adhesive sheet is a three-layer or more adhesive sheet, for example, in the case of forming an adhesive sheet having a laminate of an intermediate layer and an outermost layer, it is preferably formed from the photocurable composition. The outermost layer. In the case where the adhesive sheet is formed into an adhesive sheet comprising a laminate of an intermediate layer and an outermost layer, it is preferable that a ratio of a thickness of each outermost layer to a thickness of the intermediate layer is 1:1 to 1:20, wherein Further preferably, it is 1:2 to 1:10. If the thickness of the intermediate layer is in the above range, the thickness of the adhesive material layer in the laminated body does not become excessively large, and it is not too soft, and the workability of cutting or handling is poor, which is preferable. Further, when the outermost layer is in the above range, there is no possibility of poor followability to the uneven surface or the curved surface, and it is preferable to maintain the adhesion or wettability to the adherend. (Thickness of the present adhesive sheet) The thickness of the adhesive sheet can be made thinner by making the thickness of the sheet thin, and on the other hand, if the thickness of the sheet is too thin, for example, it is faced. When there is a concave-convex part, it may not be able to fully follow the unevenness, or it may not be able to exert sufficient adhesion. From this point of view, the thickness of the adhesive sheet is preferably from 20 μm to 500 μm, particularly preferably from 25 μm or more to 350 μm or less, of which 50 μm or more or 250 μm or less. (Adhesive force of the adhesive sheet) The adhesive sheet is preferably bonded to the glass, and the total irradiation dose of the irradiation is 4000 mJ/m. ² The 180° peel strength to the glass at the time of light, that is, the 180° peel strength of the present adhesive sheet after irradiation with light is 3 N/cm or more. When the 180° peel strength of the glass is 3 N/cm or more, excellent cohesive force can be exhibited, so that the adherends can be firmly bonded to each other. Therefore, the following image display constituent members can be attached to each other more firmly. From this point of view, as described above, the adhesive sheet preferably has a 180° peel strength to the glass of 3 N/cm or more when light is irradiated, and more preferably 5 N/cm or more thereof, of which 10 N /cm or more. (How to use this adhesive sheet) This adhesive sheet can be used directly. Moreover, it can also be laminated with other members and used. <This Adhesive Sheet Laminate> If the present adhesive sheet laminate is a laminate including the present adhesive sheet in the layer configuration, the composition is arbitrary. For example, an adhesive sheet laminate can be formed by laminating a release film on one side or both sides of the adhesive sheet. As the release film, those currently known can be used arbitrarily. The thickness of the above release film is not particularly limited. Among them, for example, from the viewpoint of workability and handleability, it is preferably 25 μm to 500 μm, more preferably 38 μm or more or 250 μm or less, or 50 μm or more or 200 μm or less. <This cured product> The above-mentioned photocurable composition is cured by irradiation with light (referred to as "photocuring"), and a half-value width X3 of one-dimensional scattering distribution characterized by small-angle X-ray scattering measurement can be obtained ( Nm ^-1 ) is a cured product of 0.05 < X3 < 0.25 (referred to as "the present hardened material"). Here, the cured product means that the light-curable composition is irradiated with light to harden it, and the form thereof is arbitrary. Therefore, it may be in the form of a sheet or a sheet. In the hardened material, the half-value width of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement is X3 (nm ^-1 When it is 0.05 < X3 < 0.25, a cured product having high cohesive force and high reliability can be obtained. From this point of view, in the present cured product, the half value width of one-dimensional scattering distribution in the small-angle X-ray scattering measurement is X3 (nm) from the same viewpoint as the above-mentioned photocurable composition. ^-1 It is preferably 0.05 < X3 < 0.25, further preferably 0.06 < X3 or X3 < 0.24, wherein 0.08 < X3 or X3 < 0.22, and further wherein 0.10 < X3 or X3 < 0.20. According to the above, the half value width X3 is preferably any one of 0.05<X3<0.25, 0.05<X3<0.24, 0.05<X3<0.22 or 0.05<X3<0.20, more preferably 0.06<X3<0.25, Any one of 0.06 < X3 < 0.24, 0.06 < X3 < 0.22 or 0.06 < X3 < 0.20, further preferably wherein 0.08 < X3 < 0.25, 0.08 < X3 < 0.24, 0.08 < X3 < 0.22 or 0.08 < X3 < Any one of 0.20 is preferably any one of 0.10 < X3 < 0.25, 0.10 < X3 < 0.24, 0.10 < X3 < 0.22, or 0.10 < X3 < 0.20. As a main method for adjusting the above-mentioned half-value width X3 in the hardened material, and adjusting the above-mentioned half-value width X1 (nm) ^-1 The method is the same. For example, the structure, composition, molecular weight, and the like of the (meth)acrylic copolymer (A) as a base polymer are adjusted, and the type of the crosslinking agent (B) or the crosslinking initiator (C) and The method of adjusting or selecting the quantity. However, it is not limited to these methods. Further, in the present cured product, in order to adjust the half value width X3 to a preferred range, as described above, it is preferable to use a carbon number of 5 or more, 8 or more, 9 or more thereof, and especially 10 in detail. The above (meth)acrylic monomer or vinyl monomer is the main copolymerization component (main component) of the (1) (meth)acrylic copolymer. Specifically, it is preferably selected from the examples of the monomers contained in the main component of the acrylic copolymer (A1). Further, it is preferred to use a hydrophilic component as the (2a) the above-mentioned (meth)acrylic monomer or the above-mentioned copolymerizable component (main component) other than the vinyl monomer. Specifically, it is preferably selected from the examples of the hydrophilic monomer contained in the main component of the following acrylic copolymer (A1). Furthermore, it is preferable to contain (2b) the hydrophilic component in a mass ratio of 0.1 to 20 with respect to the copolymerization component (main component) 100, and to improve the hydrophilicity of the trunk component. Furthermore, it is preferable to blend the (meth) number of 4 or less (meth) as a branching component of the (3) (meth)acrylic-type copolymer (A) with the mass ratio of 1 to 100 with respect to the trunk component 100. The acrylic monomer or the vinyl monomer component adjusts the microphase separation state formed by the phase of the stem component and the branch component. In addition, it is preferable that the branching component of the (3b) (meth)acrylic copolymer (A) is a (meth) group having a cyclic structure so as to have a mass ratio of from 1 to 100 with respect to the trunk component 100. The acrylic monomer or the vinyl monomer component adjusts the microphase separation state formed by the phase of the stem component and the branch component. Further, it is preferred to use a hydroxyl group-containing compound or the like having a high compatibility with a hydrophilic component as the (4a) crosslinking agent (B). Specifically, it is preferably selected from the above examples of the crosslinking agent (B). In addition, it is preferable to adjust the polarity of the trunk component as appropriate in an amount of 0.05 to 30 parts by mass of the (4b) crosslinking agent (B) per 100 parts by mass of the (meth)acrylic copolymer. As described above, by appropriately selecting the above (1) to (4) independently, the phase separation structure formed by the trunk component and the branch component can be adjusted. Wherein, in the methods (1) to (4b) above, it is preferred to combine (1) and (2a) and/or (2b), or combine (1) with (3a) and/or (3b), Preferably, all of the methods (1) to (4b) are employed in combination (1), (3a) and/or (3b) and (4a) and/or (4b). However, it is not limited to this method. As described above, it is only necessary to use a graft polymer to optimize the balance between the compatibility of the branch component and the trunk component, thereby forming an optimum phase separation state. The hydrophobic component is used as a main copolymerizable component (main component) of the copolymer (A), and a hydrophilic component is used as a branch component of the copolymer (B), whereby the half value width X3 is controlled. <Layered body for image display device configuration> The image forming device can be configured by laminating two constituent members for an image display device via the above-described light-curable composition, the above-mentioned adhesive sheet or the above-mentioned cured product. A laminate (referred to as "a laminate for the present image display device"). In this case, the constituent members of the two image display devices include, for example, any one of a group consisting of a touch sensor, an image display panel, a surface protective panel, and a polarizing film, or two or more of them. combination. Specific examples of the laminated body for constituting the image display device include a release sheet, a photocurable composition, the above-mentioned adhesive sheet, the above-mentioned cured product/touch panel, and a release sheet/ The photocurable composition or the above-mentioned adhesive sheet or the above-mentioned cured product/protective panel, release sheet/light curable composition or the above-mentioned adhesive sheet or the above-mentioned cured product/image display panel, Such as a display panel/light-curing composition or the above-mentioned adhesive sheet or the above-mentioned cured/touch panel, image display panel/light-curing composition or the above-mentioned adhesive sheet or the above-mentioned cured product/protection a panel, an image display panel/present photocurable composition or the above-mentioned adhesive sheet or the above-mentioned cured/touch panel/light-curing composition or the above-mentioned adhesive sheet or the above-mentioned cured/protective panel, Polarizing film/present photocurable composition or the above-mentioned adhesive sheet or the above-mentioned cured product/touch panel, polarizing film/light curable composition or the above-mentioned adhesive sheet or the above-mentioned cured product/touch panel/ The photocurable composition or the above-mentioned stick The sheet or the above-mentioned cured product/protective panel or the like is formed. However, it is not limited to these laminated examples. The touch panel is also included in the structure in which the touch panel function is built in the protection panel or the structure in which the touch panel function is built in the image display panel. <The present image display device> The image display device (referred to as "the present image display device") can be configured by using the laminated body for the image display device configuration as described above. The image display device can be, for example, an image display device such as a liquid crystal display, an organic EL (Electroluminescence) display, an inorganic EL display, an electronic paper, a plasma display, or a microelectromechanical system (MEMS) display. <Description of Statements> In the case of the expression "X to Y" (where X and Y are arbitrary numbers), the meaning of "X or more and Y or less" is included unless otherwise specified. Contains the meaning of "preferably greater than X" or "preferably less than Y". In the case of "X or above" or "X" (where X is an arbitrary number), the intention of "preferably greater than X" is also included. In the case of "Y" or "Y" (Y is an arbitrary number), the intention of "preferably not Y" is also included. In general, the boundary between the sheet and the film is not clear, and in the present invention, there is no need to distinguish between the two in the sentence. Therefore, in the present invention, in the case of the "film", the "sheet" is also included. In the case of "sheet", "film" is also included. [Examples] Hereinafter, the present invention will be more specifically described by way of examples. However, the invention is not limited to the embodiments. [Example 1] 15 parts by mass of a polymethyl methacrylate macromonomer having a number average molecular weight of 2,500 as a (meth)acrylic copolymer (A), 81 parts by mass of butyl acrylate, and 4 parts by mass of acrylic acid were subjected. Randomly copolymerized acrylic copolymer (A-1, mass average molecular weight: 200,000) 1 kg, added propoxylated pentaerythritol triacrylate as crosslinking agent (B) (manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester ATM-4PL) (B-1) 50 g, 15 g of Esacure TZT (manufactured by IGM) (C-1) as a photoinitiator (C), uniformly mixed, and a photocurable composition 1 was obtained. Then, the photocurable composition 1 was formed into a sheet so as to have a thickness of 150 μm on a polyethylene terephthalate film (manufactured by Mitsubishi Plastics Co., Ltd., DIAFOIL MRV, thickness: 100 μm) which was subjected to a release treatment. After the coating, the polyethylene terephthalate film (manufactured by Mitsubishi Plastics Co., Ltd., DIAFOIL MRQ, thickness: 75 μm) was subjected to a release treatment to prepare an adhesive sheet laminate 1. [Example 2] 15 parts by mass of a polymethyl methacrylate macromonomer (number average molecular weight: 3000) having a terminal functional group of a (meth)acrylic copolymer (A) as a methacryl oxime group, acrylic acid 81 parts by mass of butyl ester and 4 parts by mass of acrylic acid were randomly copolymerized to obtain an acrylic copolymer (A-2, mass average molecular weight: 150,000) 1 kg, and propoxylated pentaerythritol was added as a crosslinking agent (B). Triacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester ATM-4PL) (B-1) 110 g, Esacure TZT (manufactured by IGM) (C-1) 15 g as a photoinitiator (C), uniform mixing The photocurable composition 2 was obtained. In the photocurable composition 2, an adhesive sheet laminate 2 was produced in the same manner as in Example 1. [Example 3] 15 parts by mass of a polymethyl methacrylate macromonomer (number average molecular weight: 6,700) having a terminal functional group of a (meth)acrylic copolymer (A) and a methacryl oxime group, and acrylic acid 81 parts by mass of butyl ester and 4 parts by mass of acrylic acid were randomly copolymerized to obtain an acrylic copolymer (A-3, mass average molecular weight: 46,000) 1 kg, and decanediol diacrylic acid as a crosslinking agent (B) was added. Ester (manufactured by Osaka Organic Industries, Inc., Viscoat 260) (B-2) 5 g, Esacure TZT (manufactured by IGM) (C-1) 15 g as a photoinitiator (C), uniformly mixed to obtain photocurability Composition 3. In the photocurable composition 3, an adhesive sheet laminate 3 was produced in the same manner as in Example 1. [Example 4] 30 parts by mass of a polymethyl methacrylate macromonomer (number average molecular weight 2,500) having a terminal functional group of a (meth)acrylic copolymer (A) and a methacryl oxime group, and acrylic acid 66 parts by mass of butyl ester and 4 parts by mass of acrylic acid were randomly copolymerized to obtain an acrylic copolymer (A-4, mass average molecular weight: 110,000) 1 kg, and methacrylic acid 2 as a crosslinking agent (B) was mixed. Isocyanatoethyl ester (manufactured by Showa Denko, Karenz MOI) (B-3) 27 g. The carboxyl group of the (meth)acrylic copolymer (A-4) and the isocyanate group of the crosslinking agent (B-3) were reacted by heating at 80 ° C for 4 hours. Thereafter, 15 g of Esacure TZT (manufactured by IGM) (C-1) and 100 g of hydroxybutyl acrylate as a photoinitiator (C) were added and uniformly mixed to obtain a photocurable composition 4. In the photocurable composition 4, the adhesive sheet laminate 4 was produced in the same manner as in Example 1. [Example 5] 1 kg of the acrylic copolymer (A-2, mass average molecular weight: 150,000) used in Example 2 as the (meth)acrylic copolymer (A), mixed as a crosslinking agent (B) 2-isocyanatoethyl methacrylate (manufactured by Showa Denko, Karenz MOI) (B-3) 36 g. The carboxyl group of the (meth)acrylic copolymer (A-4) and the isocyanate group of the crosslinking agent (B-3) were reacted by heating at 80 ° C for 4 hours. Then, 15 g of Esacure KTO46 (manufactured by IGM) (C-2) as a photoinitiator (C) was added and uniformly mixed to obtain a photocurable composition 5. In the photocurable composition 5, an adhesive sheet laminate 5 was produced in the same manner as in Example 1. [Example 6] A polymethyl methacrylate macromonomer having a number average molecular weight of 2,500 as the (meth)acrylic copolymer (A) and having a terminal functional group of methacryloyl group (number average molecular weight: 2,500) 11 parts by mass, 86 parts by mass of 2-ethylhexyl acrylate and 3 parts by mass of acrylic acid were randomly copolymerized to obtain an acrylic copolymer (A-5, mass average molecular weight: 74,000) 1 kg, which was added as a crosslinking agent. (B) propoxylated pentaerythritol triacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester ATM-4PL) (B-1) 90 g, Esacure TZT (manufactured by IGM) as a photoinitiator (C) C-1) 15 g, uniformly mixed, to obtain a photocurable composition 6. In the photocurable composition 6, the adhesive sheet laminate 6 was produced in the same manner as in Example 1. [Example 7] As the (meth)acrylic copolymer (A), the terminal functional group containing isodecyl methacrylate: methyl methacrylate = 1:1 is a methacryl oxime group Acrylic graft copolymer obtained by random copolymerization of a monomer (number average molecular weight: 3000) of 13.5 parts by mass, 43.7 parts by mass of lauryl acrylate, 40 parts by mass of 2-ethylhexyl acrylate, and 2.8 parts by mass of acrylamide ( A-6, mass average molecular weight: 160,000) 1 kg, propoxylated pentaerythritol triacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester ATM-4PL) (B-1) 50 as a crosslinking agent (B) g. 15 g of methyl benzoic acid methyl ester (Lambson, SpeedCure MBF) (C-3) as a photoinitiator (C) was uniformly mixed to obtain a photocurable composition 7. In the photocurable composition 7, the adhesive sheet laminate 7 was produced in the same manner as in Example 1. [Example 8] As the (meth)acrylic copolymer (A), the terminal functional group containing isodecyl methacrylate: methyl methacrylate = 1:1 is a methacryl oxime group An acrylic graft copolymer obtained by randomly copolymerizing 30 parts by mass of a monomer (number average molecular weight: 3000), 33 parts by mass of lauryl acrylate, 34 parts by mass of 2-ethylhexyl acrylate, and 3 parts by mass of acrylamide ( A-7, mass average molecular weight: 79,000) 1 kg, added as a crosslinking agent (B) tricyclodecane dimethanol dimethacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., DCP) (B-4) 200 g 15 g of Esacure TZT (manufactured by IGM) (C-1) as a photoinitiator (C) was uniformly mixed to obtain a photocurable composition 8. In the photocurable composition 8, the adhesive sheet laminate 8 was produced in the same manner as in Example 1. [Example 9] The terminal functional group containing isodecyl methacrylate: methyl methacrylate = 1:1 as the (meth)acrylic copolymer (A) is a macromolecule of methyl methacrylate Acrylic graft copolymer obtained by random copolymerization of a monomer (number average molecular weight: 8800), 13.5 parts by mass, 43.7 parts by mass of lauryl acrylate, 40 parts by mass of 2-ethylhexyl acrylate, and 2.8 parts by mass of acrylamide ( A-8, mass average molecular weight: 110,000) 1 kg, propoxylated pentaerythritol triacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester ATM-4PL) (B-1) 90 as a crosslinking agent (B) g, 15 g of Esacure TZT (manufactured by IGM) (C-1) as a photoinitiator (C), and uniformly mixed to obtain a photocurable composition 9. In the photocurable composition 9, an adhesive sheet laminate 9 was produced in the same manner as in Example 1. [Comparative Example 1] MMA-BA-MMA triblock copolymer containing butyl acrylate and methyl methacrylate as the (meth)acrylic copolymer (A) (Kurarity LA2140e, manufactured by Kuraray Co., Ltd.) (A-9, mass average molecular weight: 74,000) 1 kg, propoxylated pentaerythritol triacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester ATM-4PL) (B-1) added as a crosslinking agent (B) 110 g of 15 g of Esacure TZT (manufactured by IGM) (C-1) as a photoinitiator (C) was uniformly mixed to obtain a photocurable composition 10. In the photocurable composition 10 described above, the adhesive sheet laminate 10 was produced in the same manner as in the first embodiment. [Comparative Example 2] An acrylic copolymer containing 24 parts by mass of 2-ethylhexyl acrylate, 74 parts by mass of butyl acrylate, and 2 parts by mass of acrylic acid as the (meth)acrylic copolymer (A) (A- 10, mass average molecular weight: 500,000) 1 kg, as a crosslinking agent (B), decanediol diacrylate (Osaka Organic Industries, Inc., Viscoat 260) (B-2) 5.5 g, as photocrosslinking 9.5 g of Esacure TZT (C-1) (manufactured by IGM) of the starting agent (C) was uniformly mixed to obtain a photocurable composition 11. Further, the (meth)acrylic copolymer (A-10) is a copolymer which does not contain a macromonomer component. In the photocurable composition 11, the adhesive sheet laminate 11 was produced in the same manner as in Example 1. [Comparative Example 3] The terminal functional group containing isodecyl methacrylate: methyl methacrylate = 1:1 as the (meth)acrylic copolymer (A) is a macromolecule of methyl methacrylate Acrylic graft copolymer obtained by random copolymerization of a monomer (number average molecular weight: 3000) of 13.5 parts by mass, 43.7 parts by mass of lauryl acrylate, 40 parts by mass of 2-ethylhexyl acrylate, and 2.8 parts by mass of acrylamide ( A-11, mass average molecular weight: 49,000) 1 kg, propoxylated pentaerythritol triacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester ATM-4PL) (B-1) 90 as a crosslinking agent (B) g, 15 g of Esacure TZT (C-1) (manufactured by IGM) as a photoinitiator (C), and uniformly mixed to obtain a photocurable composition 12. In the photocurable composition 12, the adhesive sheet laminate 12 was produced in the same manner as in the first embodiment. Further, since the (meth)acrylic polymer (A-11) has a low molecular weight and high fluidity, the photocurable composition 12 becomes a viscous liquid at room temperature. <Evaluation> Next, the evaluation methods of the photocurable composition, the adhesive sheet, or the adhesive sheet laminate obtained in the above Examples and Comparative Examples will be described. [Small-angle X-ray scattering] The small-angle X-ray scattering measurement was performed by the BL03XU (front edge soft material development industry-universal beam line) of the SPring-8 as a large-scale radiation facility. With respect to the adhesive sheet laminate produced in the examples and the comparative examples, that is, the photocurable composition before photocuring, the release film on both sides was peeled off, and the adhesive sheet was placed on the sample jig. The X-ray beam shape is set to 120 μm in the longitudinal direction and 120 μm in the lateral direction. The X-ray wavelength was set to 1 Å, and the detector used a CCD (Charge Coupled Device) (Hamamatsu Photonics V7739P+ORCA R2). The camera length was set to approximately 4 m and corrected using a standard sample (collagen). The type, thickness, and exposure time of the attenuator (attenuator) are adjusted so that the detector is not damaged by strong X-rays, and the sample is irradiated with X-rays to obtain a two-dimensional scattering image of the sample. The correction of the background is performed based on the two-dimensional scatter image of the sample obtained in the above order. Specifically, the two-dimensional scatter image obtained by performing the same operation as the above-described sequence in the state without the sample is obtained by subtracting the background from the two-dimensional scatter image of the sample using the image processing software (Image-J). A two-dimensional scatter image is obtained, and a two-dimensional scatter image for analysis is obtained. The circular scattering was confirmed in the two-dimensional scattering image for analysis. Second, self-analysis uses a two-dimensional scatter image to convert to a one-dimensional scatter distribution. Specifically, the X-ray data processing software (Fit2d) is read into the two-dimensional scattering image for analysis, and is integrated over the omnidirectional angle and integrated in the range of q=0.04 to 0.4, thereby obtaining the horizontal axis as q. [nm ^-1 ], the vertical axis is set as the one-dimensional scattering distribution of the scattering intensity. The half value width X and the peak position Y of the peak are obtained from the one-dimensional scattering distribution obtained. The one-dimensional scattering distribution has a small value near q=0.1, and the scattering intensity becomes higher toward the origin; and the scattering intensity becomes smaller toward the origin after the inflection point near q=0.1. When a minimum value is taken near q=0.1 and the scattering intensity is increased toward the origin, a region larger than the minimum value q is used as an analysis target. Further, when the scattering intensity is reduced toward the origin after passing the inflection point in the vicinity of q=0.1, the region larger than the q of the inflection point is used as the analysis target. Next, the minimum value of the scattering intensity of the analysis target region is obtained in the form of the reference line correction, and the reference line correction is performed by subtracting the minimum value from everywhere. The obtained one-dimensional scattering distribution is fitted by a Gaussian function and a Lorentz function, and the half value width of the obtained synthesis function is set to X1, and the peak position is set to Y1. The waveform separation software (Fityk) is used in the fitting. Further, the inter-region distance Z1 of the phase-separated structure formed by the photocurable composition was calculated as Z1 = 2π / Y1. Further, regarding the fact that the peak is not detected from the one-dimensional scattering distribution obtained, it is described as (ND) in the table. For the adhesive sheet laminate produced in the examples and the comparative examples, a high-pressure mercury lamp was used from the side of the release film, and the cumulative light amount at a wavelength of 365 nm became 4000 mJ/cm. ² In this manner, light irradiation is performed to cure the photocurable composition. The peak half-value width of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement is determined in the same manner as the photocurable composition before photohardening for the photocurable composition after photohardening, that is, the cured product. (X2) and the peak position (Y2), and the inter-region distance (Z2) is calculated from the peak position (Y2). [Retention] The adhesive sheet laminate produced in the examples and the comparative examples was cut into 40 mm × 50 mm and the release film of one side was peeled off, and the substrate was made of polyethylene terephthalate film (Mitsubishi). The resin-made DIAFOIL S-100 (thickness 38 μm) was back-bonded by a hand roller, and then cut into strips having a width of 25 mm × a length of 100 mm to prepare a test piece. Next, the residual release film was peeled off, and the SUS plate (120 mm × 50 mm × thickness 1.2 mm) was bonded by a hand roller so that the bonding area became 25 mm × 20 mm. Thereafter, the test piece was aged in an environment of 40 ° C for 15 minutes, and then 500 gf (4.9 N) of the test piece was mounted in the vertical direction, suspended, and allowed to stand, and then the drop time of the vertical was measured (minutes). ). For those who have not fallen within 30 minutes, the length (mm), that is, the amount of shift, in which the bonding position of SUS and the test piece is shifted downward is measured. Furthermore, the "<0.2 mm" in the table has an offset of less than 0.2 mm and has almost no offset state. [Glass adhesion force] <Measurement of adhesion force before hardening> With respect to the adhesive sheet laminate produced in the examples and the comparative examples, a release film was peeled off, and a polyethylene terephthalate film as a substrate film was peeled off. (manufactured by Toyobo Co., Ltd.; trade name "Cosmoshine A4300", thickness 100 μm), which is roll-bonded by a hand roller. It was cut into a strip shape having a width of 10 mm × a length of 100 mm, and the adhesive surface roll which was peeled off by peeling off the remaining release film was attached to the soda lime glass by a hand roller. The autoclave treatment (70 ° C, gauge pressure 0.2 MPa, 20 minutes) was carried out for final bonding, and a glass adhesion force measurement sample before photohardening was prepared. The adhesive film was peeled off from the glass while stretching at a peeling speed of 60 mm/min at an angle of 180°, and the tensile strength was measured by a load cell, and the adhesive sheet was 180° to the glass before photohardening. Peel strength (N/cm). <Measurement of the adhesion force after the hardening> The adhesive sheet laminate produced in the examples and the comparative examples was peeled off, and the release film was peeled off to form a polyethylene terephthalate film as a base film (manufactured by Toyobo Co., Ltd.). The product name "Cosmoshine A4300", thickness 100 μm) is roll bonded by a hand roller. It was cut into a strip shape having a width of 10 mm × a length of 100 mm, and the adhesive surface roll which was peeled off by peeling off the remaining release film was attached to the soda lime glass by a hand roller. After autoclaving (70 ° C, gauge pressure 0.2 MPa, 20 minutes) and final bonding, a high-pressure mercury lamp was used from the substrate film side, and the cumulative light amount at a wavelength of 365 nm became 4000 mJ/cm. ² In this manner, the adhesive sheet is irradiated with light, and the glass after the photohardening is produced to measure the sample. The adhesive film was peeled off from the glass while stretching at a peeling speed of 60 mm/min at an angle of 180°, and the tensile strength was measured by a load cell, and the adhesive sheet after photohardening was measured to be 180° to the glass. Peel strength (N/cm). In addition, "<0.5" in the table indicates a state in which the peel strength is too small to be measured. [Relative dielectric constant] For the adhesive sheet laminate produced in the examples and the comparative examples, a high-pressure mercury lamp was used from the side of the release film, and the cumulative light amount at a wavelength of 365 nm became 4000 mJ/cm. ² In this manner, light irradiation is performed to cure the photocurable composition. Thereafter, the release film was peeled off in order, and bonded to an electrode (DPT-009, manufactured by Keycom Corporation). The relative dielectric constant at 23 ° C, 50% RH, and frequency of 100 kHz was measured by an LCR meter (manufactured by Agilent Technologies, Inc., E4980A) in accordance with JIS K6911. The case where the relative dielectric constant at a frequency of 100 kHz was 3.5 or more was evaluated as "× (poor)", and the case where the relative dielectric constant was not 3.5 was evaluated as "○ (better)". [Corrosion resistance to metal] On a glass substrate (60 mm × 45 mm), a thickness of 100 to 150 Å is formed by reciprocating 10.5 times under the conditions of a line width of 70 μm, a line length of 46 mm, and a line spacing of 30 μm. Indium oxide (ITO) has five round-trip lines, and a square of 2 mm square containing ITO is formed at both ends of the round-trip line to form an ITO pattern (about 97 cm in length), thereby producing an ITO glass substrate for metal corrosion resistance evaluation. . One of the release sheets of the adhesive sheets produced in the examples and the comparative examples was peeled off, and a PET film (Cosmoshine A4100, 125 μm manufactured by Toyobo Co., Ltd.) was bonded to the exposed surface by a hand press roll. Next, after the adhesive sheet was cut into 52 mm × 45 mm, the residual release film was peeled off, and the ITO glass substrate for metal corrosion resistance evaluation was applied by means of a hand-pressing roller so as to cover five round lines of ITO. Fit the adhesive sheet. After autoclaving (70 ° C, gauge pressure 0.2 MPa, 20 minutes) and final bonding, a high-pressure mercury lamp was used from the PET film side, and the cumulative light amount at a wavelength of 365 nm became 4000 mJ/cm. ² In the manner of irradiating the adhesive sheet with light, a sample for evaluation of metal corrosion resistance (ITO wiring with an adhesive sheet) was prepared. The resistance values at room temperature were measured for the five ITO wires in the sample for metal corrosion resistance evaluation (ITO wiring with adhesive sheets), and the average value (Ω0) of the initial wiring resistance values was obtained. The sample for corrosion resistance reliability evaluation (ITO wiring with an adhesive sheet) was stored in an environment of 65 ° C and 90% RH for 800 hours. After the storage, the resistance value of the ITO wiring in the sample for metal corrosion resistance evaluation (ITO wiring with an adhesive sheet) was measured in the same manner, and the average value (Ω) of the wiring resistance values after the environmental test was determined. Then, the ITO resistance value, that is, the rate of change (%) of the resistance value between the end of the line [((Ω/Ω0)-1) × 100]), is shown in the table as "change in resistance value". When the change in resistance value is less than 5%, it is judged as "(excellent)", and when it is 5% or more and less than 10%, it is judged as "○ (better)", and 10% or more is judged as "x (poor) )". [Shape stability] The adhesive sheet laminate produced in the examples and the comparative examples was not penetrated by another release film from the side of a release film (manufactured by Mitsubishi Plastics, DIAFOIL MRQ, thickness: 75 μm). Made by Mitsubishi Plastics Co., Ltd., DIAFOIL MRV, thickness 100 μm), the adhesive sheet was half-cut into a square shape of 30 mm × 30 mm. One of the release film (made by Mitsubishi Plastics Co., Ltd., DIAFOIL MRQ, thickness 75 μm) was peeled off, and the peeled polyethylene terephthalate film was coated on the exposed adhesive surface (manufactured by Mitsubishi Plastics Co., Ltd., DIAFOIL MRT, Thickness 50 μm). The release film on both sides was cut into 50 mm × 50 mm, and a sample for shape stability evaluation before photohardening was prepared. The sample for shape stability evaluation was aged for 300 hours in an environment of a temperature of 40 ° C and a humidity of 90%, and the amount of bleeding of the adhesive material on the end surface of the adhesive sheet after the aging was observed. The amount of exudation of the adhesive material is determined by measuring the oozing distance of the adhesive material in the central portion of each side of the adhesive sheet after trimming, and the average distance between the four sides is defined as the amount of exudation (mm) of the adhesive material. After the aging, the adhesive sheet is flattened, and the amount of the adhesive material exuded by 2 mm or more is judged as "× (poor)", and the adhesive material is oozing out, but it is judged as "1 mm or more and less than 2 mm". ○ (better), and those who have not reached 1 mm are judged as "◎ (excellent)". Furthermore, the "<0.1 mm" in the table is that the amount of exudation of the adhesive material is less than 0.1 mm, and there is almost no meaning of the state of exudation of the adhesive material. ">2.0 mm" means that the exudation of the adhesive material is more obvious, and the exudation amount is larger than 2.0 mm status. [Step absorption] The peripheral portion of the glass of 58 mm × 110 mm × thickness 0.8 mm (3 mm on the long side and 15 mm on the short side) is printed with a thickness of 40 to 50 μm, and the central concave portion is prepared to be 52 mm. ×80 mm glass plate with print steps. One of the release sheets of the adhesive sheet laminate produced in the examples and the comparative examples was peeled off and laminated to the entire surface of soda lime glass (54 mm × 82 mm × thickness 0.5 mm). The residual release film is peeled off, and the pressure-pressing pressure is applied to the printing step of the glass plate of the printing step with a vacuum presser (absolute pressure 5 kPa, temperature 70 ° C, plus An evaluation sample was prepared at a pressure of 0.04 MPa). With respect to the step absorbability of the above-mentioned evaluation sample, the autoclave treatment was carried out for 30 minutes under the conditions of 60 ° C and 0.3 MPa, and the appearance of the evaluation sample to be bonded was confirmed, and the bubble was observed in the vicinity of the printing step, and it was judged as "× (poor). The person who has not seen the bubble is judged as "○ (better)". [Flame Resistant Reliability] The adhesive layer-attached polarizing plate (manufactured by Sanritz, VLC2-1518AGD2SF4, size 54 mm × 82 mm) was attached to a sodium salt of 54 mm × 82 mm × 0.5 mm thick by a hand roller. The glass was subjected to autoclave treatment (25 ° C, gauge pressure 0.2 MPa, 20 minutes) to prepare a polarizing plate substrate. The release film of one side of the adhesive sheet laminate produced in the examples and the comparative examples was peeled off, and a soda lime glass of 54 mm × 82 mm × 0.5 mm thickness was bonded to the exposed surface by a hand roller. Next, the release film remaining on the adhesive sheet laminate is peeled off, and the polarizing plate surface of the polarizing plate substrate is bonded to the exposed surface by a hand roller. After autoclaving (temperature 60 ° C, pressure 0.4 MPa, 30 minutes) and final bonding, a high-pressure mercury lamp was used from the soda lime glass surface, and the cumulative light amount at a wavelength of 365 nm became 4000 mJ/cm. ² In this manner, the adhesive sheet was irradiated with light to prepare a foam resistance reliability evaluation sample. The evaluation sample was aged in an environment of 95 ° C for 100 hours, and it was judged as "○ (better)" without foaming or the like, and the appearance of the foaming or peeling was judged as "x (poor)". [Table 1] In the photocurable composition produced in the examples, since the half value width of the photocurable composition obtained by the small-angle X-ray scattering measurement is within a specific range, moderate cohesive force and adhesion are simultaneously achieved, and storage is performed. Excellent stability or fit reliability. When the half value width of the photocurable composition before and after photohardening is 0.08 or more, the retention is particularly high. Further, the photocurable composition 6 to 9 using a hydrophobic monomer having 5 or more carbon atoms as a main copolymer component of the (meth)acrylic copolymer (A) has a relative dielectric constant at a frequency of 100 kHz. Lower than 3.5, better for touch sensors. Further, in the photocurable compositions 7 to 9, as the copolymer component of the (meth)acrylic copolymer (A), acrylamide is not used, and a carboxyl group-containing monomer or an acid anhydride group-containing monomer having a higher acidity is not used. As a hydrophilic component. Therefore, the photocurable compositions 7 to 9 are particularly excellent in metal corrosion resistance, and are also preferably used for a corrosive adherend having a metal or a metal oxide. On the other hand, in the photocurable composition produced in Comparative Example 1, the half value width X1 of the photocurable composition determined by the small-angle X-ray scattering measurement was less than 0.05, which is a specification of the present invention. Therefore, the agglutination force is too strong and lacks adhesion, and the step absorption is poor. The one-dimensional scattering distribution obtained by the small-angle X-ray scattering measurement was not observed in the photocurable composition produced in Comparative Example 2. Therefore, the photocurable composition lacks cohesive force, and the storage stability before photohardening or the foaming reliability after lamination is inferior. The photocurable composition produced in Comparative Example 3 used a (meth)acrylic polymer containing a macromonomer as a structural unit, but became a viscous liquid at room temperature, and no small angle was observed in the photocurable composition. One-dimensional scattering distribution in X-ray scattering measurements. Therefore, the photocurable composition lacks cohesive force, and the storage stability before photohardening or the foaming reliability after lamination is inferior.

Claims (15)

A photocurable composition comprising a (meth)acrylic copolymer (A), a crosslinking agent (B), and a crosslinking initiator (C) containing a macromonomer as a structural unit. And the half-value width X1 (nm ^-1 ) of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement is 0.05 < X1 < 0.30. The photocurable composition of claim 1, wherein the half value width X2 (nm ^-1 ) of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement when the total light irradiation amount is 4000 mJ/m ² is 0.05 < X2 < 0.25. The photocurable composition according to claim 1 or 2, wherein the (meth)acrylic copolymer (A) is obtained by polymerizing a monomer containing a macromonomer (a) and a vinyl monomer (b) . The photocurable composition of claim 3, wherein the macromonomer (a) has a number average molecular weight of from 500 to 100,000. The photocurable composition according to any one of claims 1 to 4, wherein at least one of the crosslinking agent (B) and the crosslinking initiator (C) and the (meth)acrylic copolymer (A) ) Bonding. The photocurable composition according to any one of claims 1 to 5, which has a property of exhibiting adhesiveness at 20 ° C and softening or fluidizing at 50 to 100 ° C. An adhesive sheet comprising the photocurable composition according to any one of claims 1 to 6. The adhesive sheet according to claim 7, wherein the adhesive sheet is bonded to the glass and the 180° peel strength to the glass is 3 N/cm or more when the light having an integrated light irradiation amount of 4000 mJ/m ² is irradiated. An adhesive sheet laminate comprising a laminate of the adhesive sheet of claim 7 or 8 and a release film. A laminated body for an image display device comprising a photocurable composition according to any one of claims 1 to 6 interposed between two constituent members for an image display device. A cured product characterized in that it is photohardened comprising a (meth)acrylic copolymer (A) containing a macromonomer as a structural unit, a crosslinking agent (B), and a crosslinking initiator (C). The composition is photohardened, and the half-value width X3 (nm ^-1 ) of the one-dimensional scattering distribution in the small-angle X-ray scattering measurement is 0.05 < X3 < 0.25. The cured product of claim 11, wherein the (meth)acrylic copolymer (A) is obtained by polymerizing a monomer containing a macromonomer (a) and a vinyl monomer (b). A laminated body for an image display device comprising a structure in which a cured product as claimed in claim 11 or 12 is interposed between two constituent members for an image display device. The image display device of claim 10 or 13, wherein the image display device comprises a touch sensor, an image display panel, a surface protection panel, a polarizing film, and a retardation film. A laminate of any two or more of the groups. An image display device comprising a laminate for forming an image display device according to claim 10, 13 or 14.