TW201833273A - Pressure-sensitive adhesive sheet and production method therefor - Google Patents

Abstract

The present invention relates to a pressure-sensitive adhesive sheet having photocurability that is a new pressure-sensitive adhesive sheet in which the pressure-sensitive adhesive can be effectively inhibited from protruding from the edges even in cases when the pressure-sensitive adhesive sheet is stored in an ordinary-temperature state. The pressure-sensitive adhesive sheet is characterized by including regions (referred to as "edge width regions") having a width w [mm] which each range from a sheet edge toward the sheet center and a region (referred to as "central region") located on the sheet-center side of the edge width regions, the edge width regions and the central region satisfying the following requirements (1) and (2). (1) The pressure-sensitive adhesive sheet has a higher gel content in the edge width regions than in the central region. (2) The pressure-sensitive adhesive sheet satisfies 30d < w < 100d, where d [mm] is the thickness of the pressure-sensitive adhesive sheet.

Description

Adhesive sheet and manufacturing method thereof

The present invention relates to an image display device such as a personal computer, a mobile terminal (PDA), a game machine, a television (TV), a car navigation system, a touch panel, a handwriting pad, etc. Adhesive sheet and manufacturing method thereof.

In order to improve the visibility of image display devices such as personal computers, mobile terminals (PDAs), and touch panels, the following methods are known: filling liquid crystal displays (LCDs), plasma displays (PDPs), and electroluminescent displays with adhesives. When an image display panel such as (ELD) and a protective panel or a touch panel member disposed on the front surface side (viewable side) are used, an adhesive sheet is used. Regarding such an adhesive sheet, for example, Patent Document 1 (Japanese Patent Laid-Open No. 2014-094976) discloses that a side surface of a multilayer body formed by laminating an adhesive layer and a substrate layer is irradiated with light having a wavelength of 360 nm or less. An adhesive sheet for an image display device and a method for manufacturing the same. Patent Document 2 (Japanese Patent No. 4971529) discloses that an adhesive sheet which is crosslinked by ultraviolet rays once and bonded to an image display device constituent member, and then the image display device constituent member is bonded to the adhesive sheet. A method in which a material is irradiated with ultraviolet rays to harden it twice. As described above, the constituent elements of the image display device have more uneven portions than the adhered surface. For example, a printed portion is formed on the adhered surface. In order to improve visibility, it is preferable that such uneven portions are also filled with an adhesive. Therefore, an adhesive composition or an adhesive sheet has been developed, which can have peelability (referred to as "tackiness") under normal conditions, i.e., room temperature, and can be heated to a heat-meltable state. Temperature, it has fluidity, can follow the unevenness of the bonding surface to fill all corners, and finally can make adherends firmly adhere to each other. For example, Patent Document 3 (Japanese Patent Laid-Open No. 2015-105296) discloses an adhesive resin composition, which is characterized by containing 100 parts by mass of an acrylic copolymer (A) and a crosslinking agent (b) of 0.5-20. A mass copolymer and a photopolymerization initiator (C) of 0.1 to 5 parts by mass, and the acrylic copolymer (A) is a graft copolymer having a weight average molecular weight of 5.0 × 10 ⁴ to 5.0 × 10 ⁵ and contains The repeating unit of acrylate) is used as the backbone component of the graft copolymer, and the repeating unit containing a macromonomer with a number average molecular weight of 5.0 × 10 ² or more and less than 6.0 × 10 ³ is used as a branch of the graft copolymer. Component, and the repeating unit derived from the macromonomer is contained in the acrylic copolymer (A) at a ratio of 0.1 to 3 mol%. From the viewpoint of ensuring handleability or preventing foreign matter from adhering to the adhesive surface, such an adhesive sheet is generally a peelable protective film (also called a "release film") in the form of an adhesive sheet laminate. Circulation. Among them, as for the transparent two-sided adhesive sheet of a constituent member of an image display device such as a touch panel, a liquid crystal panel, or a surface protection panel for a touch display, from the viewpoint of ensuring optical characteristics or softness, it is preferably Since the transparent adhesive sheet itself is thin and soft, it is often used in the form of an adhesive sheet laminate formed by laminating a release film on the adhesive sheet. Regarding such an adhesive sheet laminate, for example, Patent Document 4 (Japanese Patent Laid-Open No. 2009-102467) discloses an adhesive sheet which is sandwiched between release sheets so as to contain acrylic esters and nails. An acrylic transparent adhesive composition made by polymer blending an ABA-based triblock copolymer of an acrylic ester with a resin having a hydroxyl group, and hot melt molding. Patent Document 5 (Japanese Patent Laid-Open No. 2010-185037) discloses an adhesive sheet characterized by having an adhesive layer on at least one side of a release film and cross-linking the adhesive layer, and When measuring the temperature dispersion behavior of the tensile storage elastic modulus of the above-mentioned crosslinked adhesive layer at a frequency of 1 Hz, it is 50,000 Pa or more and 1 million at any temperature in the temperature range of 25 ° C to 120 ° C. Pa or less. Prior Art Literature Patent Literature Patent Literature 1: Japanese Patent Laid-Open No. 2014-094976 Patent Literature 2: Japanese Patent Laid-Open No. 4971529 Patent Literature 3: Japanese Patent Laid-Open No. 2015-105296 Patent Literature 4: Japanese Patent Laid-Open No. 2009 -102467 Patent Document 5: Japanese Patent Laid-Open No. 2010-185037

[Problems to be Solved by the Invention] Before photocuring, an adhesive sheet having a photo-hardenable property (referred to as "photocuring") has a lower gel fraction, so if the adhesive sheet has a lower gel fraction, The state that the release film is laminated on both sides of the material is stored at normal temperature, but there is a problem that the adhesive overflows from the end face of the laminate and adheres to dust. Among them, when the long adhesive sheet is wound into a roll shape and stored in a state where the adhesive sheet is wound, the adhesive sheet is stored in a state in which the pressure is applied to the adhesive sheet. The agent is particularly prone to overflow from the end surface of the drum. If the adhesive overflows from the end surface of the roll, the overflowed adhesive will fuse on the end surface, so it is difficult to roll out the adhesive sheet from the roll or cause obstacles such as contamination of the device when cutting the adhesive sheet. Therefore, it is necessary to save the extra cost such as storing the roll of the adhesive sheet in a low temperature state. The present invention relates to a light-curing adhesive sheet, and proposes a novel adhesive sheet that can effectively prevent the adhesive from overflowing from the end surface even when stored at normal temperature, and a method for manufacturing the same. [Technical means to solve the problem] The present invention proposes an adhesive sheet, which is characterized in that it is a region having a width w [mm] from the edge of the sheet toward the center of the sheet, which has photo-hardening properties (referred to as "end Edge width area ") and an area closer to the center of the sheet than the end edge width area (referred to as the" central area ") satisfy the following conditions (1) and (2). (1) The gel fraction of the adhesive sheet in the width region of the end edge is greater than the gel fraction of the adhesive sheet in the central region. (2) When the thickness of the adhesive sheet is d [mm], 30d <w <100d is satisfied. In addition, the present invention proposes an adhesive sheet wound body with a release film, which is characterized in that it is the adhesion of the release film formed by laminating a release film on one or both sides of the adhesive sheet. In the case where the sheet is wound into a roll shape, the above-mentioned adhesive sheet has a light-curing property, and a region w [mm] from the edge of the sheet on both sides of the short side toward the center of the sheet (referred to as the "end edge width Area ") and an area closer to the center of the sheet than the end edge width area (referred to as the" central area ") satisfy the following conditions (1) and (2). (1) The gel fraction of the adhesive sheet in the width region of the end edge is greater than the gel fraction of the adhesive sheet in the central region. (2) When the thickness of the adhesive sheet is d [mm], 30d <w <100d is satisfied. In addition, as a method for manufacturing the above-mentioned adhesive sheet, the present invention proposes a method for producing an adhesive sheet, which is characterized in that it is made by laminating a release film on one or both sides of the front and back of an adhesive sheet having photo-hardening properties. The adhesive sheet of the release film is irradiated with light by irradiating the edge width area of the adhesive sheet of the release film, so that the gel fraction of the adhesive sheet in the edge width area is greater than that in the central area. The gel fraction of the adhesive sheet. [Effects of the Invention] According to the adhesive sheet, the adhesive sheet wound body with a release film and the manufacturing method thereof according to the present invention, it is possible to effectively suppress the adhesive from the end surface even when it is stored at normal temperature. overflow. For example, even when the adhesive sheet is rolled up into a roll and stored or transported, the adhesive can be effectively prevented from overflowing from the end surface of the roll.

Next, the present invention will be described based on an embodiment example. However, the present invention is not limited to the embodiments described below. [This adhesive sheet] An adhesive sheet (referred to as "this adhesive sheet"), which is an example of an embodiment of the present invention, has the following characteristics: It is a light-hardening material, and the width from the edge of the sheet toward the center of the sheet The area of w [mm], in other words, the width of the sheet along the end edge of the sheet w [mm] (referred to as "end edge width area") has a gel fraction greater than that of the end edge. The gel fraction of the adhered sheet in the region of the width region near the center of the sheet (referred to as the "central region"). ＜ The form of this adhesive sheet ＞ This adhesive sheet can be a rectangular adhesive sheet, a long adhesive sheet, a roll of an adhesive sheet wound into a roll, or other form. In addition, the present adhesive sheet may exist in a state where a release film is laminated on one or both sides of the front and back. At this time, the so-called "long bar" means that the length dimension is larger than the width dimension. Specifically, it means that the length dimension is 5 m or more, and preferably 10 mm or more. The upper limit is not limited. If not required, the upper limit is preferably 500 m or less. Among them, as a preferred example of the adhesive sheet, an adhesive film with a release film formed by laminating a release film on one or both sides of the adhesive sheet can be wound into a roll shape. The obtained adhesive sheet wound body of the release film (also referred to as "the present wound body"). Also, in a conventional adhesive sheet roll, the wider the roll width, the more pronounced the overflow of the adhesive. On the other hand, as long as it is a wound body, even if it is a roll with a wide width, the overflow of the adhesive can be effectively suppressed. Therefore, the roll width of the wound body is preferably 20 mm to 2000 mm, and more preferably 50 mm or more or 1500 mm or less. <Gel Fraction of the Adhesive Sheet> According to research by the inventors and others, it was found that the phenomenon that the adhesive overflows from the end surface of the roll depends on the thickness of the adhesive sheet held by the release film and behaves differently. That is, it was confirmed that in the present adhesive sheet, if the width w [mm] of the end edge width region, that is, the portion having a higher gel fraction, is smaller than the thickness d of the adhesive sheet, the condensation in the end edge width region is increased. The gel fraction is, for example, when the adhesive sheet is stored in the form of an adhesive sheet roll obtained by being rolled into a roll shape, the adhesive will gradually overflow from the end surface of the roll due to the rolling pressure. In addition, it was found that there was a certain correlation between the overflow behavior of the adhesive and the width of the edge width region and the thickness of the adhesive sheet. That is, if the width w [mm] of the portion with a higher gel fraction is set to a ratio of 30 d <w with respect to the thickness d [mm] of the adhesive sheet, not only in the case of ordinary adhesive sheets, In the case of storage in the form of an adhesive sheet roll, by appropriately increasing the gel fraction in the width region of the edge, it is possible to effectively prevent the adhesive from overflowing from the end surface of the roll. From this point of view, the relationship between the width w [mm] of the end edge width region, that is, the portion with a higher gel fraction, and the thickness d [mm] of the adhesive sheet is preferably 30d <w, and more preferably 35d <W, among which 40d <w is further preferred, and 45d <w is further preferred. On the other hand, when the present adhesive sheet is used as an adhesive sheet, the end edge width region is usually cut and used. Therefore, if the width of the end edge width region is too large, the portion that is not used as the adhesive sheet increases, resulting in cost. Becomes high. From this viewpoint, w <100d is preferable, among which w <80d is further preferable, w <70d is further preferable, and w <60d is further preferable. In summary, the width w is preferably any of 30d <w <100d, 30d <w <80d, 30d <w <70d, or 30d <w <60d, more preferably 35d <w <100d, 35d < Any of w <80d, 35d <w <70d, or 35d <w <60d, and further preferably any of 40d <w <100d, 40d <w <80d, 40d <w <70d, or 40d <w <60d Among them, 45d <w <100d, 45d <w <80d, 45d <w <70d, or 45d <w <60d is the best. For example, when the thickness d of the present adhesive sheet is 0.1 mm, the width w [mm] of the portion with a higher gel fraction, that is, the edge edge width region, is preferably 3 mm to 10 mm, and further preferably 3.5. mm or more or 8.0 mm or less, more preferably 4.0 mm or more or 7.0 mm or less, and particularly preferably 4.5 mm or more or 6.0 mm or less. In the case where the adhesive sheet is a long adhesive sheet, the region of the width w [mm] from the edge of the sheet on both sides of the sheet in the short-side direction toward the center of the sheet may be the above-mentioned edge width region. The gel fraction of the adhesive sheet in the width region of the edge is preferably greater than 1% of the gel fraction of the adhesive sheet in the central region, of which the percentage is preferably greater than 5%, and the percentage is preferably greater than 10%. Among them, it is more preferably 15% or more and 99% or less. Specifically, the gel fraction in the width region of the edge is preferably 15% or more and less than 100%, and more preferably 20% or more, more preferably 25% or more, and even more preferably 30. Above% or below 99%. To sum up, the gel fraction of the width of the end edge is preferably 15% or more and less than 100% or 15% or more and 99% or less, more preferably 20% or more and less than 100% or 20% or more and 99% or less, more preferably 25% or more and less than 100% or 25% or more and 99% or less, and most preferably 30% or more and less than 100% or 30% or more and 99% or less. The standard deviation of the gel fraction in the edge width region is preferably 3% or less, more preferably 2.5% or less, and even more preferably 2% or less. Moreover, in the central region, the standard deviation of the gel fraction is also preferably 3% or less, of which 2.5% or less is preferable, and 2% or less is preferable. As described above, the standard deviation of the gel fraction of the so-called edge width region is 3% or less, which means that the gel fraction of the edge width region is uniform. By doing so, the gel fraction of the edge width region is made uniform. Higher, it is possible to further reliably prevent the adhesive from overflowing from the end surface. Furthermore, as described above, the smaller the standard deviation of the gel fraction in the width region of the edge is, the better the uniformity is. Therefore, the lower limit thereof is preferably, for example, 0% or more or 1% or more. However, the lower limit value is not particularly limited. As a preferred form of the present adhesive sheet, especially the wound body, the following adhesive sheet is exemplified, which is characterized in that it is photocurable, has an edge width region, and has a gel fraction of 15 ～ 100%; and the gel fraction of the central region is smaller than the width of the end edge; and the width w [mm] of the end width and the thickness d [mm] of the adhesive sheet satisfy 30d <w <100d. The details are as described above. As a further preferred form of the wound body, an adhesive sheet may be cited, which is characterized in that it is light-curable and has an edge width region and a gel fraction of 15 to 100%; and a center In the region, the gel fraction is more than 0% and less than 15%; and the width w [mm] of the edge width region and the thickness d [mm] of the adhesive sheet satisfy 30d <w <100d. The details are as described above. The gel fraction can be obtained as follows. About 0.05 g of adhesive was taken from the edge width area and the center area, and it was wrapped into a bag shape using a stainless steel wire mesh (# 200) whose mass (X) was measured in advance, and the folded bag mouth was closed to determine the quality of the package (Y). Then, it was immersed in 100 ml of ethyl acetate, and stored in a dark place at 23 ° C for 24 hours. Next, the package was taken out and heated at 70 ° C. for 4.5 hours to evaporate the attached ethyl acetate. The mass (Z) of the dried package was measured, and the obtained mass was substituted into the following formula to obtain it. Gel fraction [%] = [(Z-X) / (Y-X)] × 100 This adhesive sheet is photocurable. In particular, the gel fraction at the time of final hardening, for example, the gel fraction of the adhesive sheet after the present adhesive sheet is interposed between the adherends and subjected to light irradiation and light curing (referred to as "the gel at the final hardening" Fraction ratio ") is more preferably 20% to 100%, of which still more preferably 25% or more or 95% or less, and particularly preferably 30% or more or 90% or less. Here, the "gel fraction at the time of final hardening" means the gel fraction at the time when the adhesive sheet is completely hardened, and also the gel fraction at the time of incomplete hardening. meaning. In addition, as to whether the used adhesive sheet is equivalent to the present adhesive sheet, as long as the width from the edge edge area is toward the center of the sheet every certain width, preferably every 0.1 mm to 1.0 mm, a measurement sample is taken, and Measure the gel fraction of each measurement sample and investigate: (1) whether the gel fraction of the adhesive sheet in the width region of the edge is greater than the gel fraction of the adhesive sheet in the central region, and (2) the gel fraction It is sufficient if the width d [mm] of the area where the ratio is greater than the width of the edge of the central area satisfies 30d <w <100d. At this time, the gel fraction of the central region is preferably 0% or more and less than 15% as described above, and the gel fraction of the edge width region is preferably 15% or more and less than 100%. Moreover, in the present invention, when the gel fraction continuously changes from the end edge of the adhesive sheet to the central region and the boundary between the two is not clear, the gel fraction is taken as a boundary of 15%. That is, a region having a gel fraction of 15% or more is defined as an edge width region. As described above, when the gel fraction continuously changes from the edge of the adhesive sheet to the central region, the values of the gel fraction of the edge width region and the central region are set as the average of each region. The thickness d of the present adhesive sheet is preferably 0.05 mm to 1 mm. If it is within this range, for example, if it is a thin adhesive sheet having a thickness of 0.05 mm, an adhesive sheet having excellent followability in printing steps can be provided. In addition, if it is a thick adhesive material layer having a thickness of 1 mm, the amount of the printing material can be suppressed to prevent the overflow of the adhesive material during bonding by forming a considerable amount of printing step in advance. Therefore, the thickness d of the adhesive sheet is preferably 0.05 mm to 1 mm, more preferably 0.075 mm or 0.8 mm or less, and even more preferably 0.1 mm or 0.5 mm or less. In summary, the thickness d of the adhesive sheet is preferably any of 0.05 mm to 1 mm, 0.05 mm to 0.8 mm, or 0.05 mm to 0.5 mm or less, more preferably 0.075 mm to 1 mm, 0.075 mm to 0.8 mm or 0.075 mm to 0.5 mm or less is preferably 0.1 mm to 1 mm, 0.1 mm to 0.8 mm, or 0.1 mm to 0.5 mm or less. In addition, the thickness d of the present adhesive sheet does not include the thickness of the release film. 〈Composition of this adhesive sheet〉 This adhesive sheet may be a single layer including an adhesive material layer of an adhesive composition, or may include a plurality of adhesive layers such as two or three layers. In addition, the adhesive sheet may have a base material layer (a layer having no adhesiveness) as a core layer, and a structure including an adhesive material layer laminated on both sides of the base material layer. In the case of such a structure, it is preferable that the base material layer as the core layer has a material or a characteristic capable of thermoforming an adhesive sheet laminate. In addition, the more soft the adhesive material layer formed by the adhesive composition is, the more obvious the overflow of the adhesive becomes. Therefore, the more the adhesive sheet is in a state where the adhesive effect is greater than the elasticity, the more obvious it is. Effects of the present invention. Specifically, when the value of the loss tangent (Tanδ = loss shear modulus G '' / stored shear modulus G ') of the present adhesive sheet exceeds 1 at a frequency of 1 Hz and a temperature of 80 ° C, The effect of the present invention is particularly apparent. That is, under the above-mentioned conditions, the Tan δ of the adhesive sheet exceeds 1, which means that the effect of adhesiveness is greater than elasticity, and the adhesive tends to flow more easily. Therefore, if the technology of the present invention is applied to an adhesive sheet having a Tan δ of more than 1, the effect of preventing the overflow of the adhesive is particularly apparent. Based on the above, the Tanδ of the present adhesive sheet is preferably more than 1. It is not necessary to set the upper limit. If it is not necessary to set this upper limit, it is 10 or less. In the present adhesive sheet, when adjusting the value of Tan δ, it is only necessary to adjust by the constituent components of the adhesive composition. For example, in addition to the type and composition ratio of the monomers constituting the matrix resin, or the types and amounts of the cross-linking agent and the initiator, the molecular weight of the matrix resin, the crosslinking conditions, and the like can be adjusted. The value of Tan δ can be obtained by: using a viscoelasticity measuring device dynamic analyzer (for example, "RDAII" manufactured by Rheometrics) to measure the storage shear modulus (G ') and Loss-of-shear modulus of elasticity (G ''). <Conditions> ・ Fixture: Parallel plate of Φ20 mm ・ Temperature: -50 to 200 ° C (measured at a heating rate of 3 ° C / min) ・ Frequency: 1 Hz ・ Strain angle: 0.1% Material composition of the adhesive layer ＞ As long as the adhesive layer of the present adhesive sheet has photohardenability, it can be formed of a conventionally known adhesive material. Here, as the photo-hardening property, it is preferable to have a hardening property that can be hardened by light having a wavelength other than an electron beam, specifically, in a wavelength range of 200 nm to 780 nm. Examples of the adhesive layer of the present adhesive sheet include: 1) a (meth) acrylic polymer (including a copolymer in the meaning, hereinafter referred to as "acrylic (co) polymer") as a matrix resin, and An adhesive composition prepared by blending a cross-linking monomer, a cross-linking initiator or a reaction catalyst as needed; 2) using a butadiene or isoprene-based (co) polymer as a matrix resin, Adhesive composition composed of cross-linking monomer, cross-linking initiator or reaction catalyst as needed; 3) using silicone polymer as matrix resin, and cross-linking monomer 2. Adhesive composition made of crosslinking initiator or reaction catalyst as needed; or 4) Polyurethane adhesive composition using polyurethane polymer as matrix resin Wait. Among them, as an example of a preferable adhesive composition constituting the above-mentioned adhesive layer, a (meth) acrylic (co) polymer (a), a cross-linking agent (b), and a photopolymerization agent as a matrix resin are mentioned. Resin composition of the initiator (c). ((Meth) acrylic (co) polymer (a)) (meth) acrylic (co) polymer (a) can be obtained by polymerizing an acrylic monomer or a methacrylic monomer The characteristics such as glass transition temperature (Tg) are appropriately adjusted depending on the kind, composition ratio, and polymerization conditions. Among the acrylate (co) polymers, an alkyl (meth) acrylate (co) polymer is particularly preferred. The polymerization form of the acrylate copolymer may be any of a random copolymer, a block copolymer, and a graft copolymer. Examples of the monomer component constituting the alkyl (meth) acrylate (co) polymer include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and the like. Isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, second butyl (meth) acrylate, third butyl (meth) acrylate, (meth) ) Amyl acrylate, isoamyl (meth) acrylate, neopentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, heptyl (meth) acrylate, acrylic acid 2 -Ethylhexyl, n-octyl acrylate, isooctyl acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, tert-butylcyclohexyl (meth) acrylate, (meth) Decyl acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, Isostearyl (meth) acrylate, behenyl (meth) acrylate, isomethacrylate (meth) acrylate, 2-phenoxyethyl (meth) acrylate, 3,5,5-trimethyl ring Hexane acrylate, Propylphenol EO modified (meth) acrylate, dicyclopentyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxy (meth) acrylate, ( Benzyl meth) acrylate and the like. In addition, as the monomer component constituting the (meth) acrylic acid alkyl ester (co) polymer, in addition to those listed above, hydroxyethyl (meth) acrylate having a hydrophilic group or an organic functional group, etc. may be used. Esters, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, glyceryl (meth) acrylate and other (meth) acrylates containing hydroxyl groups; or (meth) acrylic acid, hexahydrophthalate 2- (meth) acryloxyethyl formate, 2- (meth) acryloxypropyl hexahydrophthalate, 2- (meth) acryloxyethyl phthalate, 2- (meth) acryloxypropyl phthalate, 2- (meth) acryloxyethyl maleate, 2- (meth) acryloxy maleate Propyl ester, 2- (meth) acryloxyethyl succinate, 2- (meth) acryloxypropyl succinate, butenoic acid, fumaric acid, maleic acid , Iconic acid, maleic acid monomethyl ester, monoconic acid monomethyl ester-containing monomers; maleic anhydride, itaconic anhydride monomers containing acid anhydride groups; (meth) acrylic acid shrinks Glyceryl ester, glycidyl α-ethyl acrylate Epoxy group-containing monomers such as 3,4-epoxybutyl (meth) acrylate; amine groups such as dimethylaminoethyl (meth) acrylate and diethylaminoethyl (meth) acrylate (Meth) acrylic monomers; (meth) acrylamide, N-third butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxy Methyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, diacetone acrylamide, cis butylene diamine, cis butylene diimide and other amine-containing groups Monomers; heterocyclic basic monomers such as vinyl pyrrolidone, vinyl pyridine, and vinyl carbazole. Furthermore, styrene, third butylstyrene, α-methylstyrene, vinyltoluene, acrylonitrile, and methacrylic acid which can be copolymerized with the above-mentioned acrylic monomers or methacrylic monomers can also be appropriately used. Various vinyl monomers, such as nitrile, vinyl acetate, vinyl propionate, alkyl vinyl ether, hydroxyalkyl vinyl ether, and alkyl vinyl monomer. Among these, as an example of a preferable matrix polymer, the (meth) acrylic-type copolymer (a1) containing the graft copolymer which has a macromonomer as a branching component is mentioned. If the acrylic copolymer (a1) is used as a matrix resin to form an adhesive material layer, the adhesive material layer can maintain a sheet shape and exhibit self-adhesion at room temperature, and if heated in an uncrosslinked state, it has It can be light-cured by melting or flowing hot-melt, and can exhibit excellent cohesion after light-curing. Therefore, if an acrylic copolymer (a1) is used as the matrix polymer, the adhesiveness is exhibited at room temperature (20 ° C) even in an uncrosslinked state, and it is more preferable if it is heated to 50 to 100 ° C. Temperatures above 60 ° C or below 90 ° C can be softened or fluidized. The glass transition temperature of the copolymer component constituting the backbone component of the acrylic copolymer (a1) may affect the flexibility of the adhesive material layer at room temperature, or the wettability of the adhesive material layer to the adherend, that is, adhesiveness. Therefore, in order to obtain moderate adhesion (tackiness) of the present adhesive sheet at room temperature, the glass transition temperature is preferably -70 ° C to 0 ° C, and particularly preferably -65 ° C or above or -5 ° C or below. Among them, it is particularly preferably above -60 ° C or below -10 ° C. However, even if the glass transition temperature of the copolymer component is the same temperature, the viscoelasticity can be adjusted by adjusting the molecular weight. For example, by reducing the molecular weight of the copolymer component, it can be further softened. Examples of the (meth) acrylic acid ester monomer contained in the main component of the acrylic copolymer (a1) include the various monomer components listed above. The acrylic copolymer (a1) preferably contains a macromonomer as a branching component of the graft copolymer and contains a repeating unit derived from the macromonomer. The so-called macromonomer is a polymer monomer having a terminal polymerizable functional group 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 acrylic copolymer (a1). Specifically, since the glass transition temperature (Tg) of the macromonomer will affect the heating and melting temperature (hot melting temperature) of the adhesive sheet, the glass transition temperature (Tg) of the macromonomer is preferably 30 ° C to 120 ° C. Among them, it is more preferably 40 ° C. or higher or 110 ° C. or lower, and still more preferably 50 ° C. or higher or 100 ° C. or lower. If it is such a glass transition temperature (Tg), by adjusting molecular weight, excellent processability or storage stability can be maintained, and it can be adjusted to be hot-melted at around 80 ° C. The so-called glass transition temperature of a macromonomer refers to the glass transition temperature of the macromonomer itself, which can be measured by a differential scanning calorimeter (DSC). In addition, in order to maintain the state where the branching components are drawn to each other at a room temperature, they are physically cross-linked as an adhesive composition, and the physical cross-linking can be released by heating to a moderate temperature to obtain fluidity. It is preferred to adjust the molecular weight or content of the macromonomer. From this viewpoint, the macromonomer is preferably contained in the acrylic copolymer (a1) at a ratio of 5% to 30% by mass, and among these, it is preferably 6% by mass or more or 25% by mass or less. It is 8 mass% or more and 20 mass% or less. In addition, the number average molecular weight of the macromonomer is preferably 500 or more and less than 8,000, of which 800 or more or 7500 is preferred, and 1000 or more or 7,000 is preferred. The macromonomer can be appropriately used by a general manufacturer (for example, macromonomer manufactured by Toa Kosei, etc.). The high molecular weight skeleton component of the macromonomer is preferably composed of an acrylic polymer or an ethylene polymer. Examples of the terminal polymerizable functional group of the macromonomer include a methacryl group, an acryl group, and a vinyl group. (Crosslinking agent (b)) As the crosslinking agent (b), a crosslinking monomer used when crosslinking an acrylate polymer can be used. For example, there may be mentioned a compound selected from (meth) acrylfluorenyl, epoxy, isocyano, carboxyl, hydroxyl, carbodiimide, oxazoline, aziridinyl, vinyl, and amino As the crosslinking agent of at least one type of crosslinkable functional group of amine, imino, or sulfonyl group, one type may be used, or two or more types may be used in combination. The crosslinkable functional group may be protected by a deprotectable protective group. Among them, it can be preferably used: a polyfunctional (meth) acrylate having two or more (meth) acrylfluorenyl groups; having two or more isocyanate groups, epoxy groups, melamine groups, glycol groups, silicon Polyfunctional organic functional resins with organic functional groups such as oxyalkyl and amine groups; organometallic compounds with metal complexes such as zinc, aluminum, sodium, zirconium, and calcium. From the viewpoint of balancing the flexibility and cohesion of the present adhesive sheet, the content of the crosslinking agent (b) is preferably 0.1 to 20 parts by mass relative to 100 parts by mass of the (meth) acrylic copolymer. The ratio includes a ratio of particularly preferably 0.5 parts by mass or more or 15 parts by mass or less, and particularly preferably a ratio of 1 part by mass or more or 13 parts by mass or less. (Photopolymerization initiator (c)) When the acrylate polymer is crosslinked, a crosslinking initiator (peroxidation initiator, photopolymerization initiator) or a reaction catalyst (tertiary amine system) is appropriately added if appropriate. Compounds, quaternary ammonium compounds, tin laurate compounds, etc.) are effective. In the case of cross-linking by ultraviolet irradiation, it is preferred to blend a photopolymerization initiator (c). The photopolymerization initiator (c) is roughly divided into two types according to the mechanism of free radical generation, which are roughly divided into: cleavable photopolymerization initiators, which can cleave single bonds of the photopolymerizable initiator itself to generate free radicals; And hydrogen abstraction type photopolymerization initiator, which can make the photoexcited initiator and the hydrogen donor in the system form an excitation complex to transfer hydrogen from the hydrogen donor. The cleavage-type photopolymerization initiators in these compounds decompose when they generate free radicals by light irradiation, and become other compounds. Once excited, they no longer function as reaction initiators. Therefore, if the intramolecular cleavage type is used as a photopolymerization initiator having an absorption wavelength in the visible light region, compared with the case of using a hydrogen abstraction type, the light-reactive property of the adhesive sheet is crosslinked by irradiation with light. Since the photopolymerizable initiator remains in the form of unreacted residues in the adhesive composition, it is less likely to cause unanticipated changes with time or promote cross-linking of the adhesive sheet, and is therefore preferred. In addition, the coloring peculiar to the photopolymerizable initiator is also preferably selected because it can be appropriately decolorized by causing the absorption in the visible light region to disappear by becoming a reaction decomposition product. On the other hand, when the photopolymerization initiator of the hydrogen abstraction type is radiated by active energy rays such as ultraviolet rays for radical generation reaction, it does not generate decomposition products like the cracking photopolymerization initiator, so it is difficult to become volatile after the reaction is completed. Ingredients can reduce damage to the adherend. The content of the photopolymerization initiator (c) is not particularly limited. For example, it is particularly preferably 0.1 to 10 parts by mass based on 100 parts by mass of the (meth) acrylic copolymer, more preferably 0.2 parts by mass or more or 5 parts by mass or less, particularly preferably 0.5 parts by mass or more, or 3 parts by mass. It is contained in a ratio of less than mass parts. However, this range can also be exceeded due to balance with other factors. The photopolymerization initiator (c) may be used singly or in combination of two or more kinds. (Other components) As this component other than the above, this adhesive sheet may contain the well-known component mix | blended with a normal adhesive composition. For example, it may suitably contain an adhesion-imparting resin, or an antioxidant, a light stabilizer, a metal deactivator, a rust inhibitor, an anti-aging agent, a hygroscopic agent, an anti-hydrolysis agent, a sensitizer, an antistatic agent, and an antifoaming agent. , Inorganic particles and other additives. Further, a reaction catalyst (a tertiary amine compound, a quaternary ammonium compound, a tin laurate compound, etc.) may be appropriately contained as necessary. [Manufacturing method of the present adhesive sheet] The present adhesive sheet can be produced by: attaching a release film formed by laminating a release film on one or both sides of the front and back of the light-curing adhesive sheet The adhesive sheet of the adhesive sheet is irradiated with light to the edge width region of the adhesive sheet of the release film to increase the gel fraction of the adhesive sheet in the edge width region. Furthermore, at this time, the gel fraction of the adhesive sheet is preferably 0 to 10%, and if it is 0 to 5%, and if it is 0 to 3%, the effect of the present invention can be further enjoyed. <Manufacturing method of an adhesive sheet roll body> Next, as an example of the present adhesive sheet, a roll-shaped adhesive sheet material obtained by winding a long adhesive sheet into a roll shape is a roll-shaped adhesive sheet material. The manufacturing method will be described in detail. As a method for manufacturing the roll-shaped adhesive sheet 2, for example, the following manufacturing method can be cited, which is characterized in that a long strip is laminated on the front side or both sides of the adhesive sheet 10 having a light-curable strip. In the step of transporting the adhesive sheet 1 with a release film made of the release films 11 and 12 in a certain direction (MD (machine direction)), as shown in FIG. 1 and FIG. Adhesion of the film The sheet width direction (TD (transverse direction) direction) of both ends of the sheet is irradiated at the end edge width regions 1A, 1A from the sheet end edge toward the sheet center width w [mm], respectively. After light curing the end edge width regions 1A and 1A in the adhesive sheet 10, the adhesive sheet 1 with the release film is wound into a roll shape to obtain a roll-shaped adhesive sheet 2. (Adhesive sheet 1 with release film before light irradiation) Adhesive sheet 1 with release film before light irradiation is formed by laminating release films 11 and 12 on both sides of the front and back of the adhesive sheet 10 The laminated sheet, the adhesive sheet 10 has photohardenability, and is preferably in any part of the adhesive sheet 10, and the gel fraction is in the range of 0 to 15%, and further preferably 12%. Hereinafter, it is more preferably 10% or less. However, it can also be set as the structure which laminated | stacked the release film only on the front and back side of this adhesive sheet 10. Examples of the method for producing the above-mentioned release sheet-attached adhesive sheet 1 include a method in which an adhesive composition is sandwiched between two release films 11 and 12 and an adhesive layer is formed using a laminator. As another method, a method of laminating another release film 12 after applying an adhesive composition to a release film 11 to form an adhesive material layer may be mentioned. However, it is not limited to this manufacturing method. Examples of the method for applying the adhesive composition include conventionally known coating methods such as reverse roll coating, gravure coating, bar coating, and doctor blade coating. As the release films 11 and 12, a well-known release film can be used suitably. For example, a polyester resin, a polypropylene film, or a polyethylene film can be appropriately selected and coated with a silicone resin and subjected to a release treatment or a release paper. Moreover, the components which can be mix | blended with the said adhesive composition can also be mix | blended in the release films 11 and 12 similarly. In addition, as a method for hardening the width region of the edge, as described below, when the method is performed by irradiating light through a release film, the release film preferably has a characteristic of not absorbing or reflecting the irradiated light. . In the case where the release films 11 and 12 are laminated on both sides of the present adhesive sheet 10, one release film 11 may be the same laminate structure or material as the other release film 12, or may be a different laminate structure or material. The thickness may be the same or different. In addition, release films of different peeling forces or release films of different thicknesses can be laminated on both sides of the adhesive sheet 10. The thickness of the release films 11 and 12 is preferably 50 to 200 μm, and more preferably 75 μm or more or 150 μm or less. With the thickness in this range, it is possible to easily adjust the gel fraction of the edge width region and the center region without hindering light irradiation from above the sheet. (Light hardening method of the edge width area 1A) As a method of irradiating light to the edge width area 1A to harden it, as shown in FIG. 1, it is preferable to apply the film to the adhesive sheet 1 with a release film The surface is irradiated with light from above, or the lower surface of the sheet is irradiated with light from below, or the upper and lower sides of the sheet are irradiated with light from both the upper and lower sides, respectively. Wherein, when the upper surface of the adhesive sheet 1 with the release film is irradiated with light from above, the edge width area 1A on both sides of the short side direction (TD direction) of the adhesive sheet 1 with the release film The light source 3 is provided above 1A, and preferably the upper surface of the sheet is irradiated with light from a vertical upward direction, or inclined above 60-90 °, of which 70-90 °, and above 80-90 °. By irradiating at such an angle, the difference (boundary) of the gel fraction between the edge width region and the center region becomes clear, so that the overflow of the adhesive can be more effectively suppressed. When the lower surface of the adhesive sheet 1 with the release film is irradiated with light from below, for the same reason as above, the two sides of the short side direction (TD direction) of the adhesive sheet 1 with the release film are A light source is provided below the end edge width regions 1A, 1A. Preferably, the lower surface of the sheet is irradiated with light from a vertical downward direction, or inclined at 60-90 ° below, 70-90 ° below, and 80-90 ° below. Here, as the adhesive sheet 1 with the release film is transported in a certain direction (MD direction), both ends of the sheet in the width direction (TD direction) of the adhesive sheet 1 with the release film are irradiated with light. For example, as shown in FIG. 3 (A), the sheet surface of the adhesive sheet 1 with a release film is irradiated with light from a vertical direction. Specifically, the light source 3 may be provided above the upper surface or below the lower surface, and the upper surface of the adhesive sheet 1 with a release film is irradiated with light from above, or the lower surface is irradiated with light from below, or A method of irradiating light from both sides of the upper and lower sides. In addition, as shown in FIG. 3 (B), the light source 3 is provided in the sheet surface extension direction (horizontal side in the horizontal direction of the figure) of the adhesive sheet 1 with the release film, and the adhesive sheet with the release film is provided. A method in which both end surfaces of the sheet width direction (TD direction) are irradiated with light laterally from a horizontal direction. If these methods are compared, the width direction (TD direction) of both ends of the sheet 1 of the adhesive sheet 1 with a release film is extended from the sheet surface, that is, from the horizontal side as shown in FIG. 3 (B). In the light method, it was found that only the surface portions of the two end surfaces in the width direction of the sheet can be hardened, so that the adhesive gradually overflows due to the roll pressure applied in the roll state. In contrast, according to the method of irradiating light to the adhesive sheet 1 with a release film from above or below or both directions, it is confirmed that by adjusting the width of the irradiation light, the adhesive can be effectively prevented from being caused by the state of the roll. Under the pressure applied by the roll and gradually overflow. As a method of manufacturing the roll of the adhesive sheet of the release film, a method of irradiating light from the horizontal side as shown in FIG. 3 (B) is not excluded. However, compared with this method, the method of irradiating light from a vertical direction as shown in FIG. 3 (A) can be manufactured extremely efficiently. In addition, as described above, according to the method of irradiating light from the upper direction, the lower direction, or both directions, the standard deviation of the gel fraction of the edge width region can be set to 3% or less as described above. In this way, according to this method, the hardening of the width region of the edge can be made uniform, and the gradual overflow of the adhesive can be effectively prevented. When adjusting the gel fraction of the end edge width region 1A of the adhesive sheet 10 to a specific range, for example, the cumulative amount of light per unit time, or the crosslinking agent and crosslinking initiation in the adhesive sheet The type or content of the agent is adjusted. But it is not limited to these. From the viewpoint of high directivity of light, it is preferable to use an LED (Light Emitting Diode) as the light source 3 for irradiating light. Regarding the light source 3, various manufacturers have disclosed those having various emission wavelengths, and it is particularly preferable to emit light in a wavelength region absorbed by a generally used initiator. Specifically, it is preferably 200 nm to 450 nm, and particularly preferably 220 nm or more or 400 nm or less. From the viewpoint of high directivity of light, it is preferable to use a light source 3 with a light diffusion angle of 50 ° or less, 40 ° or less, and 30 ° or less. By using such a light source with a light diffusion angle, the difference (boundary) of the gel fraction between the edge width region and the central region is clear, so that the overflow of the adhesive can be more effectively suppressed. From the viewpoint of the absorption wavelength of the initiator, when irradiating light, it is preferable to irradiate light having a wavelength of at least 200 nm to 450 nm. Furthermore, from the viewpoint of obtaining a sufficient gel fraction for suppressing the overflow of the adhesive, when irradiating light, it is preferable to irradiate each side of the edge width region with 1,000 mJ / cm per unit area ² ～ 10000 mJ / cm ² Of which 1500 mJ / cm ² Above or 9000 mJ / cm ² Below, of which 2000 mJ / cm ² Above or 8000 mJ / cm ² The following cumulative amount of light. Furthermore, the cumulative amount of light per unit time can be adjusted by the output of the light source, the distance between the light source and the adhesive sheet with the release film, and the transport speed of the adhesive sheet with the release film. As an example, preferable conditions are listed below. From the viewpoint of contributing to the miniaturization of the device, the output of the light source 3 is preferably 0.5 W / cm. ² ～ 50 W / cm ² , Which is further preferably 1.0 W / cm ² Above or 40 W / cm ² In the following, 2.0 W / cm is more preferred. ² Above or 30 W / cm ² the following. From the viewpoint of miniaturization of the manufacturing equipment, the length in the MD direction of the light source 3 is 3L, in other words, the length in the MD direction of the irradiation light is preferably 30 mm to 2000 mm, and more preferably 50 mm or more or 1000 mm or less. Among them, it is more preferably 100 mm or more or 500 mm or less. From the viewpoint of imparting productivity and a sufficient increase in gel fraction, the transfer speed when the adhesive sheet 1 with a release film is transported in a certain direction (MD) is preferably 1 m / min to 30 m / Of these, min is more preferably 3 m / min or more or 25 m / min or less, and still more preferably 5 m / min or more or 20 m / min or less. For example, if using output 7 W / cm ² , LED with illumination wavelength of 365 nm, light diffusion angle of 30 °, MD length (surface light source length) of 44 mm is used as the light source 3, and the distance between the light source 3 and the roll-shaped adhesive sheet 2 (surface light source distance) is set to 10 mm, when UV (ultraviolet, ultraviolet) irradiation is performed for about 3.8 s, the cumulative light amount is about 3200 mJ. (Rewinding) When the adhesive sheet 1 with a release film with end-curved width regions 1A and 1A is rolled into a roll, the winding tension per 1 m of the film width, that is, the winding tension is preferably 20 to 200 N / m wide. If the take-up tension is 20 to 200 N / m wide, no winding offset, no bulging, and no winding wrinkles will occur, and the increase in phase difference caused by the orientation of the film accompanying the tension can be reduced. good. From this viewpoint, the roll tension is preferably 30 to 150 N / m wide, and more preferably 50 N / m wide or 100 N / m wide. Each material, laminated structure and manufacturing method of the adhesive sheet with a release film before light irradiation may be the same as the above-mentioned adhesive sheet 1 with a release film. In addition, the light hardening method of the edge width region may be the same as that of the adhesive sheet 1 of the above-mentioned release film. The photo-hardening method does not have to be performed in the state of the adhesive sheet 1 with a release film as described above. For example, the edge width area of the adhesive sheet may be hardened in a state before the release film is attached, and then the release film may be attached. By adopting this method, even when a release film containing a substance that inhibits light transmission, such as an ultraviolet absorber or a colorant, is used, it is possible to satisfactorily harden the edge width region of the adhesive sheet. In addition, the present adhesive sheet is sufficient as long as it has photohardenability, and it is not necessary to harden the edge width region by light irradiation. Specifically, hardening of the edge width region can also be performed by heat. ＜ How to use this adhesive sheet ＞ This adhesive sheet can be used as an adhesive sheet after cutting off the edge width area with a high gel fraction. For example, in the case of the above-mentioned roll-shaped adhesive sheet 2, it can be rolled back and cut to an appropriate size, and the end edge width regions 1A, 1A with a high gel fraction can be cut off, and then the release film 11, 12 and used as an adhesive sheet. In addition, for example, after laminating the adhesive sheet 10 with two image display device constituent members sandwiched therebetween, at least one image display device constituent member is irradiated with light, for example, ultraviolet rays, and interposed between the members. The adhesive sheet 10 is light-crosslinked and light-hardened, whereby the two image display device constituent members can be bonded together. In addition, the hardening method when using the present adhesive sheet 10 is not limited to hardening by light irradiation, and other hardening methods such as a method of hardening by heating may be used. Here, the components of the image display device as an adherend include, for example, a surface protection panel, a touch panel, and an image display panel. <Description of sentence etc.> In the present invention, the term "(meth) acrylic acid" includes the meaning of acrylic acid and methacrylic acid, and the term "(meth) acrylfluorenyl" includes acrylfluorenyl and methacryl The meaning of fluorenyl group is the meaning of "(meth) acrylate", which includes acrylate and methacrylate. Generally speaking, the boundary between a sheet and a film is uncertain. In the present invention, there is no need to distinguish between the two languages. Therefore, in the present invention, the term "film" also includes a "sheet", which is called " In the case of "sheet", "film" is also included. In addition, when it appears as a "panel" like an image display panel, a protective panel, etc., it includes a board, a sheet, and a film. In this specification, when it is described as "X ~ Y" (X and Y are arbitrary numbers), unless otherwise specified, it means "more than X and less than Y" and also includes "preferably Meaning "greater than X" or "preferably less than Y". In addition, when it is described as "more than X" (X is an arbitrary number), unless otherwise specified, it includes the meaning of "preferably greater than X" and is described as "below Y" (Y is an arbitrary number) ), The meaning of "preferably less than Y" is also included unless otherwise specified. EXAMPLES Examples and comparative examples of the present invention will be described below. <Measurement and evaluation method> First, the measurement method and evaluation method of various physical-property values of the samples obtained in the Example and the comparative example are demonstrated. (Measurement of Gel Fraction) In the following Examples 1 to 4 and Comparative Examples 1 and 4, since the width w [mm] of the edge-width region subjected to light curing is known, the adhesive sheet obtained in the examples In the material, an amount of about 0.05 g is arbitrarily taken from the area of the width w [mm] from the edge of the sheet to the center of the sheet from both sides of the short edge direction, and this is used as a measurement sample of the width of the edge. The light-cured central area was arbitrarily taken in an amount of about 0.05 g, and this was used as a measurement sample for the central area. On the other hand, in Comparative Examples 2 and 3, the width of each sheet was cut sequentially from the end edges of the sheet on both sides in the short-side direction toward the center of the sheet at every width w [mm] = 0.5 mm, and about 0.05 g was arbitrarily taken from each area. This was used as a measurement sample for the width region of the end edge. On the other hand, an amount of about 0.05 g was arbitrarily taken from the central region without photo-hardening, and this was used as a measurement sample for the central region. In addition, regarding Comparative Examples 2 and 3, the gel fraction was also measured in a region w [mm] = 1 to 1.5 mm from the edge of the sheet on both sides in the short-side direction toward the center of the sheet. Since it is 0%, the above-mentioned width w [mm] = 1 mm is set as the edge width region. Then, each of these measurement samples was wrapped into a bag shape using a stainless steel wire mesh (# 200) having a previously measured mass (X), and the folded bag opening was closed. After measuring the mass (Y) of the package, it was dipped in 100 ml of ethyl acetate and stored in a dark place at 23 ° C for 24 hours, remove the package, heat at 70 ° C for 4.5 hours to evaporate the attached ethyl acetate, determine the quality of the dried package (Z), and The obtained mass is calculated by substituting it into the following formula. Gel fraction [%] = [(Z-X) / (Y-X)] × 100 The same gel fraction was measured at any 6 points, and the standard deviation of the gel fraction was obtained from the obtained value. The method of obtaining the standard deviation will be described. First, the average value of the gel fractions at 6 points is obtained. Next, the difference between the six points and the average value obtained was calculated to calculate the deviation. Then calculate the root-mean-square of the deviation to find the dispersion. Finally, the positive square root of the dispersion is calculated, and the standard deviation of the gel fraction in the width region of the edge is obtained. (Evaluation of the overflow of the adhesive) After exposing the roll-shaped adhesive sheet prepared in the examples and comparative examples to a constant temperature and high humidity environment of 30 ° C x 90% (RH) for 100 hours, the test piece was observed with a microscope Of the end. Those with no change in the state of the end face were evaluated as "0 (good)", and those with an adhesive overflowing and deformation of the end face were evaluated as "× (poor)". (Cumulative irradiation amount) The cumulative irradiation amount of UV irradiated in the examples and comparative examples was measured using a UV cumulative light meter "UIT-250" (manufactured by Ushio Denki Co., Ltd.) as a cumulative light meter, and a light receiving section having a wavelength of 365 nm was measured. The average value was calculated twice with two significant digits as the cumulative exposure dose of each. <Example 1> 15 parts by mass (18 mol%) of a polymethylmethacrylate macromonomer (Tg: 105 ° C) having a number average molecular weight of 2400 as a (meth) acrylic copolymer (a) was uniformly mixed, An acrylic copolymer (a-1) obtained by random copolymerization of 81 parts by mass (75 mol%) of butyl acrylate (Tg: -55 ° C) and 4 parts by mass (7 mol%) of acrylic acid (Tg: 106 ° C) Weight average molecular weight 230,000) 1 kg, 90 g of glycerol dimethacrylate (manufactured by Nippon Oil Company, product name: GMR) (b-1) as a crosslinking agent (b), and as a photopolymerization initiator ( c) A mixture of 2,4,6-trimethylbenzophenone and 4-methylbenzophenone (manufactured by Lanberti, product name: Esacure TZT) (c-1) 15 g, made for adhesion The resin composition of the material layer. The glass transition temperature of the obtained resin composition was -5 ° C. A release film 11 (manufactured by Mitsubishi Chemical Company, product name: DIAFOIL MRV-V06, thickness: 100 μm) containing a polyethylene terephthalate (PET) film that has been subjected to a mold release treatment, and a mold release treatment that is similarly used Release film 12 including a PET film (a film having a single-area layer of a biaxially-stretched isophthalic acid copolymerized PET film having a thickness of 75 μm and containing a release layer of a silicone-based compound having a thickness of 2 μm) The obtained resin composition was clamped and formed into a long sheet shape using a laminator so that the thickness of the adhesive sheet 10 became 150 μm, and a long adhesive sheet 1 with a release film was produced. As shown in FIGS. 1 and 2, the adhesive sheet 1 with a release film is transported in a certain direction (MD direction) at a conveying speed (line speed) of 20 m / min, and the adhesive sheet is attached to the release film. The width of both ends of the sheet (TD direction) from 1 to the center of the sheet w (surface hardened width) = 5 [mm] of the edge width area 1A, 1A, the upper surface of The upper side is irradiated with ultraviolet rays (UV) to cure the edge width regions 1A and 1A in the adhesive sheet 10, and the adhesive sheet 1 with a release film is wound with a winding tension (roll tension) of 1 m per film width 70 The N / m width is rolled into a roll shape to obtain a long roll-shaped adhesive sheet 2 with a total length of 100 m and a roll width of 1000 mm. The gel fraction of the adhesive sheet 10 of the adhesive sheet 1 with the release film, that is, the adhesive sheet 10 before curing, was 0%. At this time, as shown in FIG. 1 and FIG. 2, light sources 3 are respectively arranged in the vertical upward directions of the two edges of the width direction (short side direction) of the adhesive sheet 1 with the release film, and the adhesive sheet laminate 1 The upper surface of the sheet is irradiated with ultraviolet rays from vertically above. Light source 3 series use output 7 W / cm ² LEDs with an irradiation wavelength of 365 nm, a light diffusion angle of 30 °, and a length in the MD direction (the length of the light source on the surface) of 44 mm. In addition, the distance between the light source 3 and the roll-shaped adhesive sheet 2 (the distance between the light sources on the surface) was set to 10 mm, and the light was irradiated so that the cumulative amount of light per unit time was 1600 mJ. <Example 2> A roll-shaped adhesive sheet 2 was obtained in the same manner as in Example 1 except that the conveyance speed (linear speed) and the cumulative amount of light per unit time were changed as shown in the table. <Example 3> A roll-shaped adhesive sheet 2 was obtained in the same manner as in Example 2 except that the curing width was changed. <Comparative Example 1> A roll-shaped adhesive sheet 2 was obtained in the same manner as in Example 2 except that the curing width was changed. <Comparative Example 2> As shown in FIG. 3 (B), the direction of the irradiation light was changed to the sheet surface extension direction of the adhesive sheet 1 with a release film, that is, the side direction, and the curing width was changed. A roll-shaped adhesive sheet 2 was obtained in the same manner as in Example 2. <Comparative Example 3> As shown in FIG. 3 (B), the direction of the irradiated light was changed to the sheet surface extension direction of the adhesive sheet 1 with a release film, that is, the side direction, and the type of the light source was changed. Line speed), the cumulative amount of light per unit time, and other conditions were changed as shown in the table, except that a roll-shaped adhesive sheet 2 was obtained in the same manner as in Example 2. <Example 4> A roll-shaped adhesive sheet 2 was obtained in the same manner as in Example 2 except that the thickness of the adhesive sheet was changed to 100 μm and the curing width was changed to 35 d. <Comparative Example 4> A roll-shaped adhesive sheet 2 was obtained in the same manner as in Example 4 except that the curing width was changed to 25 d. [Table 1] From the above examples and the results of tests conducted by the inventors so far, it is known that when the adhesive sheet is rolled into a roll and stored at room temperature, in order to effectively suppress the adhesive from The roll end surface overflows, at least the gel fraction of the hardened area, that is, the width of the end edge area, is greater than the gel fraction of the adhesive sheet in the center area, and the width w [mm] of the end edge area and the thickness of the adhesive sheet d The relationship of [mm] is 30d <w.

1‧‧‧ Adhesive sheet with release film

1A‧‧‧Edge width area

1B‧‧‧Central Area

2‧‧‧ roll-shaped adhesive sheet

3‧‧‧ light source

3L‧‧‧MD direction length of light source

10‧‧‧ Adhesive sheet

11‧‧‧ release film

12‧‧‧ release film

FIG. 1 is a perspective view showing an example of a manufacturing method as an example of an embodiment of the present invention. FIG. 2 is a plan view showing an example of a manufacturing method as an example of an embodiment of the present invention. FIG. 3 is a schematic diagram showing an example of a method of irradiating light to both end portions of a sheet width direction (TD direction) of an adhesive sheet with a release film, and (A) illustrates a method of irradiating light to a sheet surface from a vertical direction. (B) is a diagram illustrating a method of irradiating light from an extended direction of a sheet surface.

Claims (15)

An adhesive sheet rolled body with a release film is characterized in that it is wound into an adhesive sheet with a release film formed by laminating a release film on one or both sides of an adhesive sheet. An area obtained from a roll, and the above-mentioned adhesive sheet is photocurable and has a width w [mm] from the end edges of the sheet on both sides in the short-side direction toward the center of the sheet (referred to as "end edge width region") and The area closer to the center of the sheet than the width of the end edge (referred to as the "central area") satisfies the following conditions (1) and (2): (1) The gel fraction of the adhesive sheet in the width of the end edge is greater than the center The gel fraction of the adhesive sheet in the region; (2) When the thickness of the adhesive sheet is set to d [mm], 30d <w <100d is satisfied. For example, the adhesive sheet wound body with a release film of claim 1, wherein the gel fraction of the above-mentioned edge width region is 15% or more and 100% or less. For example, the adhesive sheet wound body with a release film according to claim 1 or 2, wherein the gel fraction of the above central region is 0% or more and less than 15%. For example, the wound body of an adhesive sheet with a release film according to any one of claims 1 to 3, wherein the thickness d of the adhesive sheet is 0.05 mm to 1 mm. For example, the adhesive sheet wound body with a release film according to any one of claims 2 to 4, wherein the standard deviation of the gel fraction in the width region of the edge is 3% or less. A method for manufacturing an adhesive sheet wound body with a release film, characterized in that it is a method for producing an adhesive sheet wound body with a release film according to any one of claims 1 to 5, and Light is irradiated to the edge edge width area of the adhesive sheet of the release film by laminating the release film on the front or back side or both sides of the light-curing adhesive sheet, so that the edge edge width area is adhered. The gel fraction of the sheet is greater than the gel fraction of the adhesive sheet in the central region. For example, the method for manufacturing an adhesive sheet wound body with a release film according to claim 6, wherein after the light is irradiated, the adhesive sheet with the release film is wound into a roll shape. For example, the method for manufacturing an adhesive sheet wound body with a release film according to claim 6 or 7, wherein the upper surface of the above-mentioned adhesive sheet with the release film is irradiated with light from above, or the lower surface of the sheet is irradiated with light. Light is irradiated from below, or light is radiated from both sides of the sheet. The method for manufacturing an adhesive sheet roll with a release film according to any one of claims 6 to 8, wherein the light diffusion angle of the light source irradiating the light is 50 ° or less. According to the method for manufacturing an adhesive sheet roll with a release film according to any one of claims 6 to 9, the LED is used as a light source for irradiating light. The method for manufacturing an adhesive sheet roll with a release film according to any one of claims 6 to 10, wherein when the light is irradiated, light having a wavelength of at least 200 nm to 450 nm is irradiated. The method for manufacturing an adhesive sheet wound body with a release film according to any one of claims 6 to 11, wherein light with a cumulative amount of light per unit area of 1,000 mJ / cm ² to 10000 mJ / cm ² is irradiated. An adhesive sheet is characterized in that it is a light-hardening region and a region of width w [mm] from the end of the sheet toward the center of the sheet (referred to as "end-edge width region") and is wider than the end edge. The area in the width region near the center of the sheet (referred to as the "central region") satisfies the following conditions (1) and (2): (1) The gel fraction of the adhesive sheet in the width region of the edge is greater than the adhesive sheet in the central region (2) When the thickness of the adhesive sheet is set to d [mm], 30d <w <100d is satisfied. If the adhesive sheet of claim 13 is a long adhesive sheet. For example, the adhesive sheet of claim 14, wherein the gel fraction of the edge width region is 15 to 100%.