Method for manufacturing adhesive film and method for manufacturing optical film attached to adhesive film

Abstract

This invention provides a technique suitable for manufacturing adhesive sheets under low environmental load conditions. The method for manufacturing the adhesive sheet provided by this invention includes the following steps: Step A, using a release liner and irradiating a laminate sequentially comprising a substrate sheet, a coating layer containing a photocurable composition, and the release liner with light to form an adhesive sheet from the coating layer; and Step B, peeling the release liner from the adhesive sheet. The above manufacturing method repeatedly performs steps A and B using the release liner that has been peeled off in step B. Regarding the release liner, a peel force PS is used. For sheets with a peel strength of less than 1.0 N / 50 mm, the peel strength PS The peel force between the 3-series sheet and the aforementioned adhesive sheet was measured after peeling the sheet three times from its unused state.

Description

Method for manufacturing adhesive sheet and method for manufacturing optical film with adhesive sheet The present invention relates to a method for manufacturing an adhesive sheet and a method for manufacturing an optical film with an adhesive sheet. Various image display devices represented by liquid crystal display devices and electroluminescent (EL) display devices generally have an optical laminate including an optical film such as a polarizing film and an adhesive sheet. An adhesive sheet is usually used to join the optical films contained in the optical laminate or to join the optical laminate with the image display panel. Typically, a sheet formed by curing a monomer group containing acrylic monomers or silicone monomers by polymerization and cross-linking is used as the adhesive sheet. Patent document 1 discloses a method of irradiating a laminate including a substrate sheet, a coating layer containing a photocurable composition, and a release liner in sequence with light to form an adhesive sheet from the coating layer. In this method, the two main surfaces of the coating layer are covered by the substrate sheet and the release liner, so that oxygen can be suppressed from hindering the photocuring reaction. Prior art documents Patent documents Patent Document 1: Japanese Patent Application Laid-Open No. 2016-155981 Problem to be Solved by the Invention: Forming adhesive sheets by curing typically requires energy such as heat or light. For example, compared to methods that use an oven to heat-cure a coating layer containing an adhesive composition and a solvent (thermal curing), methods that use light (photocuring) can further reduce the amount of energy required to form an adhesive sheet. However, from the perspective of reducing the environmental impact of adhesive sheet manufacturing, focusing solely on the energy required to cure the coating layer is not sufficient. The present invention aims to provide a technology suitable for producing adhesive sheets under low environmental load. Means for Solving the Problems The present invention provides a method for manufacturing an adhesive sheet, comprising the following steps: Step A, using a release liner, and irradiating light to a laminate comprising a substrate sheet, a coating layer containing a photocurable composition, and the release liner in this order, thereby forming an adhesive sheet from the coating layer; and Step B, peeling the release liner from the adhesive sheet; the manufacturing method comprises repeatedly performing Step A and Step B using the release liner peeled off in Step B; and using a peeling force PS 3 The sheet material with a peeling force of less than 1.0N / 50mm is used as the aforementioned release liner. 3 is the peeling force of the sheet from the adhesive sheet measured after the sheet was peeled off from the adhesive sheet three times, counting from the unused state. In another aspect, the present invention provides a method for manufacturing an optical film with an adhesive sheet, comprising the following steps: disposing an optical film on the exposed surface of an adhesive sheet formed by the adhesive sheet manufacturing method of the present invention to form the optical film with an adhesive sheet. Effects of the Invention According to the present invention, a technology suitable for producing an adhesive sheet with a low environmental load can be provided. The manufacturing method of the adhesive sheet of the first aspect of the present invention comprises the following steps: Step A, using a release liner, and irradiating light to a laminate comprising a substrate sheet, a coating layer containing a photocurable composition, and the release liner in sequence, thereby forming an adhesive sheet from the coating layer; and Step B, peeling the release liner from the adhesive sheet; The manufacturing method comprises repeatedly performing the steps A and B using the release liner peeled off in the step B; and using a peeling force PS 3 The sheet material with a peeling force of less than 1.0N / 50mm is used as the aforementioned release liner. 3 is the peeling force of the sheet from the adhesive sheet measured after the sheet was peeled off from the adhesive sheet three times, counting from the unused state. Regarding the second aspect of the present invention, for example, in the method for manufacturing an adhesive sheet according to the first aspect, the peeling force PS of the release liner measured in an unused state with the adhesive sheet is 0 is 0.01N / 50mm or more. Regarding the third aspect of the present invention, for example, in the method for manufacturing an adhesive sheet according to the first or second aspect, the peeling force PS of the release liner is 3 Peel force PS of the release liner measured in the unused state with respect to the adhesive sheet 0 PS 3 / PS 0 is less than 10. Regarding the fourth aspect of the present invention, for example, in the method for producing an adhesive sheet according to any one of the first to third aspects, the peeling force PS of the adhesive sheet measured with respect to the release liner in an unused state is 0, the peeling force PS between the release liner and the adhesive sheet measured after the release liner is peeled off from the adhesive sheet once from the unused state 1's PS 1 / PS 0 is less than 10. In a fifth aspect of the present invention, for example, in the method for producing an adhesive sheet according to any one of the first to fourth aspects, the release liner includes a release layer on a surface facing the coating layer, and the release layer has a thickness of 110 nm or less. Regarding a sixth aspect of the present invention, for example, in the method for manufacturing an adhesive sheet according to any one of the first to fifth aspects, the peeling force between the release liner and the adhesive sheet is smaller than the peeling force between the substrate sheet and the adhesive sheet. Regarding a seventh aspect of the present invention, for example, in the method for producing an adhesive sheet according to any one of the first to sixth aspects, the photocurable composition comprises a monomer group containing a (meth)acrylic monomer and / or a partial polymer of the monomer group. In an eighth aspect of the present invention, for example, in the method for producing an adhesive sheet according to the seventh aspect, the (meth)acrylic acid-based monomer includes a carboxyl group-containing monomer. A ninth aspect of the present invention provides a method for manufacturing an optical film with an adhesive sheet, comprising the following steps: forming an optical film with an adhesive sheet by disposing an optical film on an exposed surface of an adhesive sheet formed by the method for manufacturing an adhesive sheet according to any one of the first to eighth aspects. Regarding the tenth aspect of the present invention, for example, in the method for producing an optical film with an adhesive sheet according to the ninth aspect, the optical film includes at least one film selected from the group consisting of a polarizing film and a retardation film. The present invention will be described in detail below. However, the present invention is not limited to the following embodiments and can be arbitrarily modified and implemented without departing from the spirit of the present invention. The inventors of this case realized that by reusing the release liner that was previously discarded immediately after peeling, the environmental load in the adhesive sheet manufacturing process could be further reduced. Based on this idea, they conducted research and completed the present invention. The release force of the release liner after peeling from the adhesive sheet is greater than that of the unused state. On the other hand, according to the inventors' research, the degree of increase in the release force tends to decrease with the number of peelings. The release force PS after peeling from the adhesive sheet three times from the unused state is 3 can be used as an effective indicator to reflect the increase of peeling force. Peeling force PS 3. Release liners with a force less than 1.0N / 50mm are suitable for repeated use. Repeated use reduces the amount of release liners that need to be discarded, thus reducing the environmental impact. [Method for manufacturing an adhesive sheet] An example of a method for manufacturing an adhesive sheet of the present invention will be described with reference to FIG1 . In this example, light 14 is irradiated to a first laminate 10 comprising a substrate sheet 11, a coating layer 12 containing a photocurable composition, and a release liner 13 in this order, and an adhesive sheet 1 is formed from the coating layer 12 (step A). ​​The light 14 will penetrate the release liner 13 and reach the coating layer 12, causing the coating layer 12 to harden. However, the irradiation with light 14 can be implemented from the substrate sheet 11 side, or from both sides of the release liner 13 and the substrate sheet 11. In step A, the adhesive sheet 1 is formed using the release liner 13. Before the release liner 13 is peeled off, the formed adhesive sheet 1 is sandwiched between the substrate sheet 11 and the release liner 13 to constitute a part of the second laminate 17. After step A, the release liner 13 is peeled off from the adhesive sheet 1 (step B). In the method of FIG1 , steps A and B are repeatedly performed using the release liner 13 that has been peeled off in step B. Step A using the peeled release liner 13 is performed by forming a first laminate 10 comprising, in this order, a substrate sheet 11, a coating layer 12, and the peeled release liner 13, and irradiating the formed first laminate 10 with light 14. In the method of Figure 1, the peeling force PS is used. 3 The sheet material with a peeling force of less than 1.0N / 50mm is used as the peeling liner 13. 3 represents the peel force from the adhesive sheet 1 measured after the sheet was peeled three times from the unused state. The peel force of the release liner 13 against the adhesive sheet 1 generally increases with the implementation of step A. We speculate that the increase in peel force is due to an increase in the amount of functional groups or free radicals present on the surface of the release liner 13 on the coating layer 12 side caused by irradiation with light 14. This increase may be caused by the formation of chemical bonds between the release liner 13 and the adhesive sheet 1 by irradiation with light 14, and the presence of some of these bonds or radicals formed by decomposition of the bonds remaining on the surface even after the adhesive sheet 1 is peeled off. <Step A> (Release Liner) Release Force PS of Release Liner 13 3 can also be 0.9N / 50mm or less, 0.8N / 50mm or less, 0.7N / 50mm or less, 0.6N / 50mm or less, 0.5N / 50mm or less, 0.4N / 50mm or less, 0.3N / 50mm or less, 0.2N / 50mm or less, and can further be 0.15N / 50mm or less. Peel force PS The lower limit of 3 is, for example, 0.01 N / 50 mm or more, and may be 0.03 N / 50 mm or more, 0.05 N / 50 mm or more, 0.08 N / 50 mm or more, or even 0.1 N / 50 mm or more. The peeling force PS between the release liner 13 and the adhesive sheet 1 is measured in the unused state. 0 can also be 0.01N / 50mm or more, 0.02N / 50mm or more, or even 0.03N / 50mm or more. Peel force PS The upper limit of 0 is, for example, 0.2 N / 50 mm or less, and may be 0.17 N / 50 mm or less, 0.15 N / 50 mm or less, 0.12 N / 50 mm or less, or further may be 0.1 N / 50 mm or less. Release force PS of release liner 13 3 Peel force PS between the release liner 13 and the adhesive sheet 1 measured in the unused state 0 PS 3 / PS 0 can also be less than 10, less than 7, less than 5, less than 4, less than 3, less than 2, and more preferably less than 1.8. 3 / PS The lower limit of 0 is, for example, 1.1 or more, and further 1.2 or more. The peeling force PS between the release liner 13 and the adhesive sheet 1 is measured in an unused state. 0, the peeling force PS of the release liner 13 from the adhesive sheet 1 measured after peeling it once from the unused state 1's PS 1 / PS 0 can be less than 10, or less than 7, less than 5, less than 4, less than 3, less than 2, less than 1.8, or even less than 1.7. 1 / PS The lower limit of 0 is, for example, 1.05 or more, and further 1.1 or more. Peel force PS after peeling off the adhesive sheet 1 n times from the unused state n (n is an integer greater than 0 corresponding to the number of peeling times; when n=0, it is the peeling force PS in the unused state 0) Evaluation can be performed as follows: Using the release liner to be evaluated, perform steps A and B n times, then perform step A (n+1) times. The resulting second laminate 17 is cut into 50 mm wide test pieces to produce test pieces. A 180° peel test is then performed, in which only the release liner 13 is peeled off from the produced test piece. The peel test is performed approximately 0.5 to 1 hour after the adhesive sheet 1 is formed. From the time the adhesive sheet 1 is formed until the peel test is performed, the second laminate 17 and the test piece are stored in an atmosphere at 23°C ± 5°C. The peel test can be performed using a tensile testing machine. More specifically, the test can be performed as follows: After securing the entire surface of the test piece on the substrate sheet 11 side to a fixed plate (e.g., a SUS plate) using double-sided adhesive tape, secure one longitudinal end of the fixed plate to the upper chuck of a tensile testing machine. After peeling the release liner 13 from the end on the upper chuck side, fold it 180° and secure it to the lower chuck of the tensile testing machine. The fixed plate should have sufficient mechanical strength to stably conduct the peel test. The double-sided adhesive tape should have sufficient adhesion to prevent the substrate sheet 11 from peeling off the fixed plate during the peel test. The peel test speed should be 300 mm / minute, and the test temperature should be 23°C ± 5°C. If the width of the second laminate 17 is less than 50 mm, the measured value at the original width can be converted to a value equivalent to a width of 50 mm. If the formation direction of the coating layer 12 can be determined, the width direction of the test piece can be defined as the TD, which is perpendicular to the MD direction. When the base sheet 11 and the release liner 13 are in a long strip shape, the width direction thereof can be set as the width direction of the test piece. Peel strength PS 0. PS n And repeated peeling causes PS n The degree of increase varies depending on, for example, the composition of the photocurable composition, the composition, formation conditions, and thickness of the adhesive sheet 1 to be formed, the material, thickness, and state of the release surface of the release liner 13, and the composition, formation conditions, and thickness of the release layer that the release liner 13 may have. An example of the base material of the release liner 13 (hereinafter referred to as "liner base material") is a resin film. Examples of resins that may be contained in the liner base material include polyesters such as polyethylene terephthalate and polyethylene naphthalate, acetate resins, polyether sulfones, polycarbonates, polyamides, polyimides, polyolefins, (meth)acrylic resins, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl alcohol, polyarylates, and polyphenylene sulfide. The resin is preferably a polyester such as polyethylene terephthalate. The release liner 13 preferably has excellent transmittance to the light 14 irradiated in step A. The thickness of the release liner 13 is, for example, 10 to 200 μm, or 25 to 150 μm. The release liner 13 may also include layers other than the liner substrate. The release liner 13 may also include a release layer. The release liner 13 in Figure 2 includes a liner substrate 131 and a release layer 132 formed on one surface of the liner substrate 131. The release liner 13 in Figure 2 can be used with the release layer 132 on the coating layer 12 side. The release layer 132 is typically a hardened layer of a release agent composition containing a release agent. Various release agents can be used, such as silicone release agents, fluorine release agents, long-chain alkyl release agents, fatty acid amide release agents, and silica powder. The release liner 13 may also include a hardened layer of a release agent composition containing a silicone release agent as a main component (hereinafter referred to as a "silicone release layer"). The silicone release layer is particularly suitable for achieving both adhesion and release properties to the acrylic adhesive sheet 1. In this specification, the main component refers to the component with the highest content. Silicone release agents include various curing types, such as addition-curing, condensation-curing, UV-curing, electron beam-curing, and solvent-free silicones. Addition-curing silicones are particularly suitable for forming a release layer that provides both excellent adhesion to the acrylic adhesive sheet 1 and excellent releasability. Curing silicones can also be silicone-modified resins in which reactive silicones have been introduced into organic resins such as urethane, epoxy, and alkyd resins through graft polymerization. Examples of addition reaction-hardening polysiloxane materials include polyorganosiloxanes having vinyl or alkenyl groups in the molecule. Addition reaction-hardening polysiloxane materials may also not have hydrogen silyl groups. Examples of alkenyl groups include 3-butenyl, 4-pentenyl, 5-hexenyl, 6-heptenyl, 7-octenyl, 8-nonenyl, 9-decenyl, 10-undecenyl, and 11-dodecenyl. Examples of polyorganosiloxanes include polyalkylalkylsiloxanes such as polydimethylsiloxane, polydiethylsiloxane, and polymethylethylsiloxane, polyalkylarylsiloxanes, and copolymers of multiple Si-containing monomers such as poly(dimethylsiloxane-diethylsiloxane). The polyorganosiloxane is preferably polydimethylsiloxane. A mold release composition containing a silicone-based mold release agent as its main component (hereinafter referred to as a "silicone release agent composition") typically includes a crosslinking agent. An example of a crosslinking agent is a polyorganosiloxane having a hydrosilyl group. The crosslinking agent may also have two or more hydrosilyl groups per molecule. The silicone release agent composition may also contain a curing catalyst. Examples of curing catalysts include platinum-based catalysts. Examples of platinum-based catalysts include chloroplatinic acid, platinum-olefin complexes, and chloroplatinic acid-olefin complexes. The amount of platinum-based catalyst used is, for example, 10 to 1000 ppm (by weight, calculated as platinum) relative to the total solids content of the composition. The silicone release agent composition may also contain additives. Examples of additives include release control agents and adhesion promoters. Examples of release control agents include unreacted silicone resins, more specifically organosiloxanes such as octamethylcyclotetrasiloxane, and MQ resins. The total amount of release control agents and adhesion promoters used is, for example, 1 to 30% by weight relative to the total solids content of the composition. Other examples of additives include fillers, antistatic agents, antioxidants, UV absorbers, plasticizers, and colorants. The total amount of other additives used is, for example, 10% by weight or less relative to the total solids content of the composition. The silicone release agent composition may also contain an organic solvent. Examples of organic solvents include hydrocarbon solvents such as cyclohexane, n-hexane, and n-heptane; aromatic solvents such as toluene and xylene; ester solvents such as ethyl acetate and methyl acetate; ketone solvents such as acetone and methyl ethyl ketone; and alcohol solvents such as methanol, ethanol, and butanol. Two or more organic solvents may also be included. The amount of organic solvent used is preferably 80-99.9% by weight of the silicone release agent composition. The release layer 132 can be formed, for example, by heating and drying a coating film containing a release agent composition formed on the lining substrate 131. The release agent composition can be applied using various coating methods, including roll coating, contact roll coating, gravure coating, reverse coating, roller brushing, spraying, dip roll coating, rod coating, blade coating, air knife coating, curtain coating, lip coating, and die coating. Heating and drying can be performed using, for example, hot air drying. The heating temperature and time vary depending on the heat resistance of the lining substrate, but are typically 80-150°C and approximately 10 seconds to 10 minutes. Irradiation with active energy rays, such as ultraviolet rays, may also be used as needed. The thickness of the release layer 132 is, for example, 10 to 300 nm. The upper limit of the thickness may be 200 nm or less, 150 nm or less, 120 nm or less, 110 nm or less, 100 nm or less, less than 100 nm, 90 nm or less, 80 nm or less, 70 nm or less, less than 70 nm, or even less than 65 nm. The lower limit of the thickness may be 15 nm or more, 20 nm or more, 25 nm or more, 30 nm or more, 35 nm or more, 40 nm or more, 45 nm or more, or even more than 50 nm. The thickness of the release layer 132 may also be 110 nm or less. In other words, the release liner 13 has a release layer 132 on the coating layer 12 side, and the thickness of the release layer 132 may also be 110 nm or less. The release liner 13 may be in the form of a single sheet or a long strip. (Base Sheet) An example of the base sheet 11 is a resin film. Examples of the resin contained in the base sheet 11 are the same as the examples of the resin that can be contained in the lining base material. The base sheet 11 may have a transmittance to the light 14 irradiated in step A, or may have a transmittance to the light 14 of the same degree as that of the release liner 13 . The thickness of the base sheet 11 is, for example, 10 to 200 μm, or 25 to 150 μm. The substrate sheet 11 may also include a release layer on the surface facing the coating layer 12. Examples of release layers and their production methods for the substrate sheet 11 are similar to those for the release liner 13. Both the release liner 13 and the substrate sheet 11 may include release layers. In this case, both release layers may be formed from a release agent composition containing the same release agent as its main component. Furthermore, the thickness of the two release layers may differ; for example, the release layer on the substrate sheet 11 may be thicker. For the base sheet 11 , a sheet having a greater peeling force from the adhesive sheet 1 than the release liner 13 can generally be selected. The base sheet 11 may be in the form of a single sheet or in the form of a long strip. (Photocurable composition) The photocurable composition is a composition that can form an adhesive sheet 1 from the coating layer 12 by irradiating light 14. The photocurable composition includes, for example, a monomer group containing a (meth)acrylic monomer and / or a partial polymer of the monomer group. The content of the (meth)acrylic component in the photocurable composition, that is, the (meth)acrylic monomer and its partial polymer, can be 50% by weight or more, 60% by weight or more, 70% by weight or more, or even 80% by weight or more. In this case, an acrylic adhesive sheet 1 having (meth)acrylic polymer and its cross-linked product as the main component can be formed. However, the photocurable composition is not limited to the above examples. In this specification, (meth)acrylic acid means acrylic acid and methacrylic acid. (Meth)acrylate means acrylate and methacrylate. Examples of (meth)acrylic monomers include alkyl (meth)acrylates having an alkyl group with 1 to 20 carbon atoms in the side chain. The alkyl group may have 7 or fewer carbon atoms, 6 or fewer carbon atoms, 5 or fewer carbon atoms, or even 4 or fewer carbon atoms. The alkyl group may be linear or branched. Examples of alkyl (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, secondary butyl (meth)acrylate, tertiary butyl (meth)acrylate, isobutyl (meth)acrylate, n-pentyl (meth)acrylate, isopentyl (meth)acrylate, n-hexyl (meth)acrylate, isohexyl (meth)acrylate, isoheptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate, isodecyl (meth)acrylate, n-dodecyl (meth)acrylate (lauryl (meth)acrylate), n-tridecyl (meth)acrylate, n-tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecanyl (meth)acrylate, and octadecyl (meth)acrylate. The alkyl (meth)acrylate may also be n-butyl (meth)acrylate. The content of the alkyl (meth)acrylate in the monomer group may be, for example, 40% by weight or greater, or may be 50% by weight or greater, 60% by weight or greater, 70% by weight or greater, 80% by weight or greater, 85% by weight or greater, 90% by weight or greater, or even 95% by weight or greater. When calculating the content, the weight of the partial polymer is converted to the weight of each monomer before polymerization. The monomer group may also include a carboxyl group-containing monomer. The carboxyl group-containing monomer may be a (meth)acrylic acid monomer. In other words, the (meth)acrylic acid monomer may also include a carboxyl group-containing monomer. Examples of carboxyl group-containing monomers are (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid. The content of the carboxyl group-containing monomer in the monomer group is, for example, 10% by weight or less, and may also be 9% by weight or less, 8% by weight or less, 7% by weight or less, 6% by weight or less, 5.5% by weight or less, or even 5% by weight or less. The lower limit of the content is, for example, 0.1% by weight or more, and may also be 0.5% by weight or more, or even 1% by weight or more. The monomer group may also not include a carboxyl group-containing monomer. Compared to (meth)acrylates without carboxyl groups, carboxyl group-containing monomers generally polymerize and harden faster when irradiated with light 14. This higher speed means that the elastic modulus of the adhesive sheet 1 can be increased, thereby improving the dimensional stability against deformation. However, on the other hand, the peeling force of the release liner on the adhesive sheet 1 tends to increase. Therefore, the use of a PS that has suppressed the peeling force The release liner 13 of 3 is particularly advantageous when the photocurable composition contains a carboxyl group-containing monomer. The monomer group may also include a hydroxyl-containing monomer. The hydroxyl-containing monomer may be a (meth)acrylic monomer. In other words, the (meth)acrylic monomer may also include a hydroxyl-containing monomer. The hydroxyl-containing monomer may help improve the cohesive strength of the adhesive sheet 1. Examples of hydroxyl-containing monomers include: 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, and (4-hydroxymethylcyclohexyl)-methacrylate. The hydroxyl-containing monomer is preferably 2-hydroxyethyl (meth)acrylate or 4-hydroxybutyl (meth)acrylate. The content of the hydroxyl-containing monomer in the monomer group may be, for example, 5% by weight or less, or may be 4% by weight or less, 3% by weight or less, 2% by weight or less, 1% by weight or less, 0.8% by weight or less, 0.5% by weight or less, 0.3% by weight or less, 0.2% by weight or less, or even 0.1% by weight or less. The lower limit of the content may be, for example, 0.01% by weight or more, or 0.03% by weight or more, or even 0.05% by weight or more. The monomer group may also not contain a hydroxyl-containing monomer. In the photocurable composition, each of the above monomers may also be included as a partially polymerized product. The partially polymerized product may be either a single polymer or a copolymer. The partially polymerized product may contribute to the stable formation of the coating layer 12 by appropriately increasing the viscosity of the photocurable composition. The photocurable composition generally contains a photopolymerization initiator. Examples of the photopolymerization initiator include a photoradical generator that generates free radicals using visible light and / or ultraviolet light with a wavelength shorter than 450 nm. Examples of photopolymerization initiators include benzoin ethers such as benzoin methyl ether, benzoin isopropyl ether, and benzyl dimethyl ketal; substituted benzoin ethers such as anisole methyl ether; substituted acetophenones such as 2,2-diethoxyacetophenone and 2,2-dimethoxy-2-phenylacetophenone; α-hydroxyalkyl phenones such as 1-hydroxycyclohexyl-phenyl ketone; substituted α-ketone alcohols such as 2-methyl-2-hydroxypropiophenone; aromatic Sulfonyl chloride; photoactive oximes such as 1-phenyl-1,1-propanedione-2-(o-ethoxycarbonyl)-oxime; diphenyl ketone compounds such as diphenyl ketone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenyldiphenyl ketone, hydroxydiphenyl ketone, acrylated diphenyl ketone, 4-benzoyl-4'-methyldiphenyl sulfide, 3,3',4,4'-tetrakis(tertiary butylperoxycarbonyl)diphenyl ketone; 9-oxysulfur , 2-chloro-9-oxysulfuronium , 2-methyl 9-oxosulfuronium , isopropyl 9-oxosulfonium , 2,4-diisopropyl 9-oxosulfonium , 2,4-diethyl 9-oxosulfuron 9-Oxosulfuronium Series compounds; 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis(trichloromethyl)-s-triazine, 2-(p-methoxyphenyl)-4,6-bis(trichloromethyl)-s-triazine, 2-(p-tolyl)-4,6-bis(trichloromethyl)-s-triazine, 2-piperonyl (piperonyl)-4,6-bis(trichloromethyl)-s-triazine, 2,4-bis(trichloromethyl)-6-phenylvinyl-s-triazine, 2-(naphthyl-1-yl)-4,6-bis(trichloromethyl)-s-triazine, 2-(4-methoxy-naphthyl-1-yl)-4,6-bis(trichloromethyl)-s-triazine, 2,4-trichloromethyl-(piperonyl)-6 -trioxane, 2,4-trichloromethyl-(4'-methoxyphenyl)-6-trioxane; oxime ester compounds such as 1,2-octanedione, 1-[4-(phenylthio)-, 2-(O-benzyloxime)], O-(acetyl)-N-(1-phenyl-2-oxo-2-(4'-methoxy-naphthyl)ethylidene)hydroxylamine; phosphine compounds such as bis(2,4,6-trimethylbenzyl)phenylphosphine oxide and 2,4,6-trimethylbenzyldiphenylphosphine oxide; quinone compounds such as 9,10-phenanthrenequinone, camphorquinone, and ethylanthraquinone; borate compounds; carbazole compounds; imidazole compounds; and titaniumocene compounds. The photocurable composition may also contain one or more photopolymerization initiators. The amount of the photopolymerization initiator in the photocurable composition is, for example, 0.02 to 10 parts by weight, or 0.05 to 5 parts by weight, relative to 100 parts by weight of the total monomer group and its partial polymer. The photocurable composition may also contain a crosslinker. An example of a crosslinker is a multifunctional monomer having two or more polymerizable functional groups per molecule. The multifunctional monomer may also be a (meth)acrylic monomer. Examples of multifunctional monomers include monomers having two or more C=C bonds per molecule, and monomers having one or more C=C bonds and one or more polymerizable functional groups such as epoxy, azoxy, oxazolinyl, hydrazine, or hydroxymethyl groups per molecule. The multifunctional monomer preferably has two or more C=C bonds per molecule. Examples of crosslinking agents include polyfunctional acrylates (ester compounds of polyols and (meth)acrylic acid, etc.) such as (poly)ethylene glycol di(meth)acrylate, (poly)propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, 1,2-ethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol diacrylate (NDDA), 1,12-dodecanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, and tetramethylolmethane tri(meth)acrylate; allyl (meth)acrylate, vinyl (meth)acrylate, divinylbenzene, epoxy acrylate, polyester acrylate, urethane acrylate, butyl di(meth)acrylate, and hexyl di(meth)acrylate. The multifunctional monomer is preferably a multifunctional acrylate, more preferably trimethylolpropane tri(meth)acrylate, hexanediol di(meth)acrylate, or dipentatriol hexa(meth)acrylate. The amount of crosslinker to be added varies depending on the molecular weight and number of functional groups, but is, for example, 5 parts by weight or less, 3 parts by weight or less, 2 parts by weight or less, 1 part by weight or less, or even 0.5 parts by weight or less per 100 parts by weight of the total of the monomer group and its partial polymer. The lower limit of the amount to be added is, for example, 0.01 parts by weight or more, and more preferably 0.05 parts by weight or more. The photocurable composition may also contain additives other than those mentioned above. Examples of additives include chain transfer agents, silane coupling agents, viscosity modifiers, tackifiers, plasticizers, softeners, antioxidants, fillers, colorants, antioxidants, surfactants, antistatic agents, and ultraviolet absorbers. The solvent content in the photocurable composition may be, for example, 5% by weight or less, or may be 4% by weight or less, 3% by weight or less, 2% by weight or less, 1% by weight or less, or even 0.5% by weight or less. The photocurable composition may be substantially solvent-free. "Substantially solvent-free" means that a solvent derived from additives, etc., may be allowed at a content of, for example, 0.1% by weight or less, preferably 0.05% by weight or less, and more preferably 0.01% by weight or less. The viscosity of the photocurable composition is preferably 5 to 100 poise. A photocurable composition having a viscosity within the above range is particularly suitable for forming the coating layer 12 . (First Laminated Body and Its Formation) The first laminate 10 may include layers other than the substrate sheet 11, coating layer 12, and release liner 13. These other layers may be disposed on the side of the substrate sheet 11 and / or release liner 13 opposite to the coating layer 12. The coating layer 12 is preferably in contact with the substrate sheet 11 and release liner 13. The first laminate 10 can be formed, for example, by forming the coating layer 12 on a substrate sheet 11 (or release liner 13) and placing the release liner 13 (or substrate sheet 11) on the formed coating layer 12. Alternatively, the first laminate 10 can be formed by flowing the photocurable composition into a space formed between the substrate sheet 11 and the release liner 13, with the main surfaces facing each other at a predetermined distance. The release liner 13 that has been peeled off can also be used in such a manner that the surface that was on the coating layer 12 side in step A immediately before peeling, for example, the surface on the release layer 132 side, is again positioned on the coating layer 12 side. The coating layer 12 can be formed by various coating methods such as roll coating, contact roll coating, gravure coating, reverse coating, roller brush, spray coating, dip roll coating, rod coating, doctor blade coating, air knife coating, curtain coating, lip coating, and die coating. The thickness of the coating layer 12 can be adjusted according to the desired thickness of the adhesive sheet 1 , for example, 5-100 μm, 5-50 μm, 5-25 μm, or even 5-20 μm. The first laminate 10 may also include a long substrate sheet 11, a long coating layer 12, and a long release liner 13. In other words, it may also be in the form of a long strip. The long first laminate 10 can be obtained, for example, by conveying the substrate sheet 11 and release liner 13 unwound from a roll while forming the coating layer 12 therebetween. (Irradiation with Light) The light 14 irradiating the first laminate 10 is, for example, visible light or ultraviolet light having a wavelength shorter than 450 nm. The light 14 may also include light having a wavelength in the same region as the absorption wavelength of the photopolymerization initiator contained in the photocurable composition. Alternatively, the light 14 may be short-wavelength light having a cutoff wavelength of 300 nm or less, which is suitable for suppressing the degradation of the release liner 13 caused by the light 14, by passing through an optical filter or the like. The cutoff of short-wavelength light is suitable for suppressing the degradation of the release liner 13 caused by the light 14. The light source of the light 14 is, for example, a light irradiation device having an ultraviolet irradiation lamp. Examples of ultraviolet irradiation lamps include ultraviolet LEDs, low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, xenon lamps, microwave-excited mercury lamps, black light lamps, chemical lamps, germicidal lamps, low-pressure discharge mercury lamps, and excimer lasers. Two or more ultraviolet irradiation lamps may also be combined. The irradiation of the light 14 may be continuous or intermittent. The irradiation intensity of the light 14 is, for example, 1 to 20 mW / cm 2 The cumulative amount of light 14 on the first layered body 10 is, for example, 100 to 5000 mJ / cm 2 . The polymerization rate of the monomer group of the adhesive sheet 1 is preferably 90% or higher, and may be 95% or higher, 98% or higher, or even 99% or higher. The gel fraction of the adhesive sheet 1 is, for example, 50% or more, or may be 75% or more, 80% or more, or even 85% or more. <Step B> In step B, release liner 13 is peeled from cured second laminate 17. Second laminate 17 sequentially comprises base sheet 11, adhesive sheet 1, and release liner 13. By peeling, release liner 13 and third laminate 15 comprising base sheet 11 and adhesive sheet 1 are obtained. The peeling force between the release liner 13 and the adhesive sheet 1 may also be smaller than the peeling force between the base sheet 11 and the adhesive sheet 1 . The peeling force of the base sheet 11 on the adhesive sheet 1 is, for example, 0.1-10 N / 50 mm, or 1-8 N / 50 mm, 2-7 N / 50 mm, or even 3-5 N / 50 mm. There is no particular limit on the number of times the release liner 13 can be reused in the production of the adhesive sheet 1 after peeling off. For example, it can be more than 3 times, more than 5 times, or even more than 7 times. There is no particular limit on the upper limit of the number of times. For example, the peeling force PS with the adhesive sheet 1 can be adjusted. n Continuous use within the range of no more than 3.0N / 50mm. The peeled release liner 13 can be recycled after being wound into a roll. The thickness of the adhesive sheet 1 is, for example, 2-70 μm, or 2-50 μm, 5-40 μm, 10-30 μm, 10-25 μm, or even 10-20 μm. The adhesive sheet 1 can be used, for example, in an optical laminate including an optical film. In other words, the adhesive sheet 1 can also be used in an optical laminate. The optical laminate can also be an optical film with an adhesive sheet attached. However, the use of the adhesive sheet 1 is not limited to the above examples. Another example of the method for manufacturing an adhesive sheet of the present invention is described with reference to FIG3 . In this example, a coating layer 12 of a photocurable composition is formed on one side of a long strip of substrate sheet 11 released from a roll 31 by a coating device 32 . Then, a long strip of release liner 13 released from a roll 33 is arranged on the coating layer 12 to form a long strip of first laminate 10 . Then, light 14 is irradiated from a light irradiation device 34 to the first laminate 10 to form a long strip of adhesive sheet 1 . Then, the release liner 13 is peeled off from the second laminate 17 containing the adhesive sheet 1 and wound onto a roll 35 . The above steps are carried out while conveying the substrate sheet 11 and the release liner 13 . The wound release liner 13 is reused. The third laminate 15 formed by peeling off the release liner 13 can be used, for example, in an optical film with an adhesive sheet or its manufacture. The method of FIG. 3 is particularly suitable for mass production of the adhesive sheet 1 . Referring to FIG. 4 , another example of a method for producing an adhesive sheet according to the present invention will be described. This example is identical to the example of FIG. 3 , except that the release liner 13, which has been peeled from the second laminate 17, is not wound onto a roll 35 and reused in the production of the adhesive sheet 1. The method of FIG. 4 is particularly suitable for mass production of the adhesive sheet 1. [Release Liner] According to a different aspect from the above, the present invention provides a release liner for use in the above-mentioned method for producing an adhesive sheet of the present invention. Examples of the release liner are the same as those previously described in the description of the method for producing an adhesive sheet. [Manufacturing method of optical film with adhesive sheet] An example of the manufacturing method of optical film with adhesive sheet of the present invention is described with reference to FIG5. In this example, the release liner 13 is peeled off from the second laminate 17 which sequentially includes a substrate sheet 11, an adhesive sheet 1 and a release liner 13, and the optical film 2 is arranged on the exposed surface 18 of the adhesive sheet 1 formed thereby, thereby forming an optical film 21 with adhesive sheet. The optical film 21 with adhesive sheet sequentially includes a substrate sheet 11, an adhesive sheet 1 and an optical film 2. The second laminate 17 can be formed by the above-mentioned step A. The release liner 13 can also be peeled off in the manner of the above-mentioned step B. The optical film 21 with adhesive sheet can be used in an image display device, etc., directly or after peeling off the substrate sheet 11, in the form of an optical laminate having an adhesive sheet 1 and an optical film 2. The optical laminate can also be attached to an object (such as an image forming panel) through the adhesive sheet 1. However, the use of the adhesive sheet-attached optical film 21 is not limited to the above example. Other components, such as optical films, may be placed on the exposed surface 18 formed by peeling the base sheet 11 from the adhesive sheet-attached optical film 21. For example, an adhesive sheet-attached optical film 22 may be formed that includes, in order, an optical film 2A, an adhesive sheet 1, and an optical film 2B (see FIG. 6 ). The optical films 2A and 2B may be the same or different. The optical film 2 may be disposed directly or indirectly on the exposed surface 18. In other words, the optical film 2 may be disposed in contact with the exposed surface 18 or may be disposed with another layer interposed therebetween. Another example of the method for manufacturing an optical film with an adhesive sheet according to the present invention will be described with reference to FIG7 . In this example, a long strip of optical film 2 is placed on the exposed surface 18 of the adhesive sheet 1 of the third laminate 15 formed by the method of FIG3 , thereby forming a long strip of optical film with an adhesive sheet 21. Optical film 2 is unwound from a roll 36 and placed on the exposed surface 18. As shown in FIG7 , the formation of the adhesive sheet 1 and the formation of the optical film with an adhesive sheet 21 can also be performed continuously. The method of FIG7 is particularly suitable for mass production of optical film with an adhesive sheet 21. The optical film 2 may be, for example, a film comprising at least one selected from the group consisting of a polarizing film and a retardation film. Alternatively, the optical film 2 may be a laminated film comprising a polarizing film and / or a retardation film. Alternatively, the optical film 2 may comprise a glass film. However, the optical film 2 is not limited to the above examples. Polarizing film includes a polarizer. Typically, a polarizing film includes a polarizer and a protective film (transparent protective film). The protective film is, for example, positioned in contact with the main surface (the surface with the widest area) of the polarizer. The polarizer can also be positioned between two protective films. The protective film can also be positioned on at least one side of the polarizer. Polarizers are not particularly limited. Examples include hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and partially saponified ethylene-vinyl acetate copolymer films, which are uniaxially stretched by adsorbing dichroic substances such as iodine or dichroic dyes; and oriented polyene films such as dehydrated polyvinyl alcohol films and hydrochloric acid-degraded polyvinyl chloride films. Polarizers are typically composed of a polyvinyl alcohol film (including partially saponified ethylene-vinyl acetate copolymer films) and a dichroic substance such as iodine. The thickness of the polarizer is not particularly limited, and may be, for example, 80µm or less, 50µm or less, 30µm or less, 25µm or less, or even 20µm or less. The lower limit of the polarizer thickness is not particularly limited, and may be, for example, 1µm or greater, 5µm or greater, 10µm or greater, or even 15µm or greater. Thin polarizers (e.g., 20µm or less) minimize dimensional change, which can improve the durability of the optical laminate, particularly at high temperatures. The material of the protective film can be a thermoplastic resin with excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, etc. Specific examples of the thermoplastic resin include: cellulose resins such as triacetyl cellulose, polyester resins, polyether sulfide resins, polysulfide resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, cyclic polyolefin resins (northolefin resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins and mixtures thereof. The material of the protective film can also be a thermosetting resin or ultraviolet curing resin such as (meth) acrylic, urethane, acrylic urethane, epoxy, and silicone. When the polarizing film has two protective films, the materials of the two protective films can be the same or different. For example, a protective film made of a thermoplastic resin may be bonded to one principal surface of the polarizer via an adhesive, and a protective film made of a thermosetting resin or a UV-curable resin may be bonded to the other principal surface of the polarizer. The protective film may also contain one or more optional additives. Examples of such additives include UV absorbers, antioxidants, lubricants, plasticizers, mold release agents, anti-coloring agents, flame retardants, nucleating agents, antistatic agents, pigments, and colorants. The thickness of the protective film can be determined appropriately, but is generally about 10 to 200 μm from the perspectives of strength, workability, and film properties. The polarizer and protective film are typically bonded using a water-based adhesive. Examples of water-based adhesives include isocyanate adhesives, polyvinyl alcohol adhesives, gelatin adhesives, vinyl latex, water-based polyurethanes, and water-based polyesters. Other adhesives besides the above include UV-curable adhesives and electron beam-curable adhesives. Electron beam-curable adhesives for polarizing plates exhibit suitable adhesion to various protective films. Adhesives may also contain metal compound fillers. In the polarizing film, a retardation film can be formed on the polarizer to replace the protective film. Other protective films or retardation films can also be further provided on the protective film. Regarding the protective film, a hard coating may be provided on the surface opposite to the surface in contact with the polarizer, and the protective film may also be subjected to treatments such as anti-reflection, anti-sticking, diffusion, and anti-glare. The polarizing film may also be a circularly polarizing film. The retardation film may be a film obtained by stretching a polymer film or a film obtained by aligning and fixing a liquid crystal material. The retardation film may have birefringence in the in-plane and / or thickness direction, for example. Phase difference films include: anti-reflection phase difference films (refer to Japanese Patent Laid-Open No. 2012-133303

[0221] ,

[0222] ,

[0228] ), viewing angle compensation phase difference films (refer to Japanese Patent Laid-Open No. 2012-133303

[0225] ,

[0226] ), and tilted orientation phase difference films for viewing angle compensation (refer to Japanese Patent Laid-Open No. 2012-133303

[0227] ). The specific structure of the retardation film, such as the retardation value, arrangement angle, three-dimensional birefringence, single layer or multilayer, etc., is not particularly limited, and a known retardation film can be used. The thickness of the retardation film is preferably 20µm or less, more preferably 10µm or less, further preferably 1-9µm, and particularly preferably 3-8µm. The retardation film may also include, for example, a quarter-wave plate and / or a half-wave plate in which liquid crystal material is aligned and fixed. An image display device can also be formed using an optical film with an adhesive sheet formed by the above-mentioned method. The image display device can be formed, for example, by joining the optical films 21 and 22 with an adhesive sheet to an image display panel. The joining can also be performed by the adhesive sheet 1. The image display device can be an organic EL display or a liquid crystal display. However, the image display device is not limited to the above examples. The image display device can also be an electroluminescent (EL) display, a plasma display (PD), a field emission display (FED: Field Emission Display), etc. The image display device can be used for home appliances, in-vehicle use, public information display (PID) use, etc. EXAMPLES The present invention will be further described in detail below by way of examples. However, the present invention is not limited to the following examples. (Production Example 1: Preparation of a Photocurable Composition) 100 parts by weight of n-butyl acrylate (BA), 5 parts by weight of acrylic acid (AA), 0.1 parts by weight of 2-hydroxyethyl acrylate (2HEA), and 0.05 parts by weight each of Omnirad 184 and Omnirad 651 (both manufactured by IGM Resins) as photopolymerization initiators were placed in a four-necked flask and irradiated with ultraviolet light under a nitrogen atmosphere to obtain a partially photopolymerized monomer syrup. Ultraviolet light irradiation was continued until the viscosity of the solution in the flask reached approximately 20 Pa·s (measurement conditions: BH viscometer No. 5 rotor, 10 rpm, measurement temperature 30°C). Subsequently, 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA) as a crosslinker was uniformly mixed with 100 parts by weight of the monomer syrup to obtain a photocurable composition. (Production Example 2: Preparation of Release Liner A) 100 parts by weight of an addition reaction-curable silicone (LTC761, a 30% by weight toluene solution containing a hexenyl-containing polyorganosiloxane, manufactured by Dow Corning Toray Co., Ltd.), 0.9 parts by weight of a release control agent (BY24-850, containing unreacted silicone resin, manufactured by Dow Corning Toray Co., Ltd.), 2 parts by weight of a curing catalyst (SRX212, containing a platinum catalyst, manufactured by Dow Corning Toray Co., Ltd.), and a toluene / hexane mixed solvent (volume ratio of 1:1) as a diluent were mixed to obtain a silicone release agent composition A. The silicone solid content concentration in release agent composition A was 1.0% by weight. Next, the release agent composition A was applied to one side of a liner substrate (polyester film Lumirror 38R75, 38µm thick) using a wire bar and heated at 130°C for 1 minute to produce a release liner A having a release layer (60nm thick) on one side. (Production Example 3: Preparation of Release Liner B) A release liner B having a release layer (thickness 120 nm) on one side was prepared in the same manner as in Production Example 2 except that the thickness of the release agent composition A applied to the liner substrate was changed. Preparation Example 4: Preparation of Release Liner C: 33.3 parts by weight of an addition-curable silicone (KS-847T, containing a vinyl-containing polyorganosiloxane, a 30% by weight toluene solution, manufactured by Shin-Etsu Chemical) and 1 part by weight of a curing catalyst (CAT-PL-50T, containing a platinum catalyst, manufactured by Shin-Etsu Chemical) were mixed with a toluene / hexane mixture (volume ratio 1:1) as a diluent to prepare a silicone release agent composition C. The silicone solids concentration in release agent composition C was 1.0% by weight. Next, release agent composition C was applied to one side of a liner substrate (Lumirror 38R75 polyester film, 38 µm thick) using a wire bar and heated at 130°C for 1 minute. This produced a release liner C having a release layer (100 nm thick) on one side. Preparation Example 5: Preparation of Release Liner D: 66.6 parts by weight of addition-curable silicone (KS-847H, containing a vinyl-containing polyorganosiloxane, a 30% by weight toluene solution, manufactured by Shin-Etsu Chemical) and 0.2 parts by weight of a curing catalyst (CAT-PL-50T, containing a platinum catalyst, manufactured by Shin-Etsu Chemical) were mixed with a toluene / hexane mixture (volume ratio 1:1) as a diluent to prepare a silicone release agent composition D. The silicone solids concentration in release agent composition D was 1.0% by weight. Release agent composition D was then applied to one side of a liner substrate (Lumirror 38R75 polyester film, 38µm thick) using a wire bar and heated at 130°C for 1 minute to produce a release liner D having a release layer (100nm thick) on one side. [Peeling force PS 0] The photocurable composition of Manufacturing Example 1 was applied to one side of a substrate sheet (a polyester film Lumirror 38R75 without a release layer, 38 μm thick) using a dispenser to form a coating layer. Next, each release liner of Manufacturing Examples 2 to 5 was placed on the formed coating layer to obtain a first laminate. The release liner was placed so that the release layer and the coating layer were in contact. Next, a light source was applied from the release liner side of the first laminate under an illumination of 2.4 mW / cm 2 And the cumulative light intensity is 2880mJ / cm 2 The coating layer was photocured by irradiating with ultraviolet light (black light source) under the conditions of , thereby forming a second laminate a consisting of a base sheet, an adhesive sheet (thickness 20 μm) and a release liner. A test piece of 220 mm in length and 50 mm in width was cut from the formed second laminate a (the longitudinal direction was the coating direction of the photocurable composition). Using a tensile testing machine, a 180° peeling test was performed on the test piece, which had its entire substrate sheet side fixed to a SUS plate as a fixing plate, and the release liner was peeled off in the longitudinal direction to evaluate the peeling force PS. 0. The peeling test conditions are as above. [Peeling force PS 1. PS 2. PS Evaluation of 3] After removing a portion of the second laminate a in the longitudinal direction by cutting off the second laminate a, the release liner is peeled off for reuse. The second laminate b is formed in the same manner as the second laminate a, except that the peeled release liner is used. The test piece cut out from the second laminate b is used as the evaluation object, and the peeling force PS is the same as the peeling force PS. 0, evaluate the peeling force PS 1. Next, the release liner is peeled off from the second laminate a, and the peeled release liner is reused in the same manner as the above-mentioned method for forming the second laminate b, forming the second laminate c from the second laminate b (second reuse), and forming the second laminate d from the second laminate c (third reuse). In addition to using the test pieces cut out from the second laminate c and the second laminate d as the evaluation objects, the peel force PS is used as the evaluation object. 0, evaluate the peeling force PS separately 2 and PS 3. [Evaluation of the ease of peeling (peelability) of the release liner with only the ends fixed] For the second laminate d, with only the two longitudinal ends fixed to the fixed surface using double-sided adhesive tape on the substrate sheet side, the release liner was peeled from one of the ends. The ease of peeling was evaluated based on the peeling state as follows: A: The portion of the second laminate not fixed did not lift off the fixed surface, and the release liner could be peeled off easily. B: Although the portion of the second laminate not fixed lifted off slightly from the fixed surface, the release liner could be peeled off. C: The portion of the second laminate not fixed lifted off from the fixed surface, making the release liner difficult to peel off. The evaluation results of the release force and ease of release for each release liner are shown in Table 1 below. [Table 1] Industrial Applicability The adhesive sheet obtained by the production method of the present invention can be used, for example, in an optical layered body or an image display device. 1: Adhesive sheet 2, 2A, 2B: Optical film 10: First laminate 11: Base sheet 12: Coating layer 13: Release liner 131: Liner substrate 132: Release layer 14: Light 15: Third laminate 17: Second laminate 18: Exposed surface 21, 22: Optical film with adhesive sheet 31, 33, 35, 36: Roll 32: Coating device 34: Light irradiation device FIG1 is a schematic diagram illustrating an example of a method for manufacturing an adhesive sheet of the present invention. FIG2 is a cross-sectional view schematically showing an example of a release liner that can be used in the method for manufacturing an adhesive sheet of the present invention. FIG3 is a schematic diagram illustrating an example of a method for manufacturing an adhesive sheet of the present invention. FIG4 is a schematic diagram illustrating an example of a method for manufacturing an adhesive sheet of the present invention. FIG5 is a schematic diagram illustrating an example of a method for manufacturing an optical film attached to an adhesive sheet of the present invention. FIG6 is a schematic diagram illustrating an example of a method for manufacturing an optical film attached to an adhesive sheet of the present invention. FIG7 is a schematic diagram illustrating an example of a method for manufacturing an optical film attached to an adhesive sheet of the present invention. 1: Adhesive sheet 10: 1st laminate 11: Base material sheet 12: coating layer 13: Peel backing 14: Light 15: The third layer 17: Second layer

Claims

1. A method for manufacturing an adhesive sheet, comprising the following steps: Step A, using a release liner and irradiating a laminate comprising a substrate sheet, a coating layer containing a photocurable composition and the aforementioned release liner with light to form an adhesive sheet from the aforementioned coating layer; and Step B, peeling the aforementioned release liner from the aforementioned adhesive sheet; The aforementioned manufacturing method involves repeatedly performing Step A and Step B using the aforementioned release liner that has been peeled off in Step B; and using a sheet with a peel force PS 3 less than 1.0 N / 50 mm as the aforementioned release liner, wherein the peel force PS 3 is the peel force between the sheet and the aforementioned adhesive sheet measured after peeling the sheet from the aforementioned adhesive sheet three times from an unused state.

2. The method for manufacturing the adhesive sheet as claimed in claim 1, wherein the peel force PS0 between the aforementioned release liner and the aforementioned adhesive sheet, measured in an unused state, is 0.01 N / 50 mm or more.

3. The method for manufacturing the adhesive sheet as claimed in claim 1, wherein the ratio of the peel force PS3 of the aforementioned release liner to the peel force PS0 of the aforementioned adhesive sheet, measured in the unused state, is 10 or less.

4. The method for manufacturing the adhesive sheet as claimed in claim 1, wherein the ratio of the peel force PS0 between the aforementioned release liner and the aforementioned adhesive sheet, measured in an unused state, to the peel force PS1 between the aforementioned release liner and the aforementioned adhesive sheet after being peeled off once from the unused state, is 10 or less.

5. The method for manufacturing the adhesive sheet as claimed in claim 1, wherein the surface of the release liner on the side of the coating layer has a release layer; and the thickness of the release layer is 110 nm or less.

6. The method for manufacturing the adhesive sheet as claimed in claim 1, wherein the peel force between the aforementioned release liner and the aforementioned adhesive sheet is less than the peel force between the aforementioned substrate sheet and the aforementioned adhesive sheet.

7. The method for manufacturing the adhesive sheet as claimed in claim 1, wherein the aforementioned photocurable composition comprises a monomer group containing (meth)acrylic acid monomers and / or a portion of the polymer of the aforementioned monomer group.

8. The method for manufacturing the adhesive sheet as claimed in claim 7, wherein the aforementioned (meth)acrylic monomer includes a carboxyl-containing monomer.

9. A method for manufacturing an optical film for an adhesive sheet, comprising the following steps: forming an optical film for an adhesive sheet by depositing an optical film on the exposed surface of an adhesive sheet formed by any one of claims 1 to 8.

10. A method for manufacturing an optical thin film of an adhesive sheet as claimed in claim 9, wherein the aforementioned optical thin film comprises at least one thin film selected from the group consisting of polarizing thin films and phase difference thin films.

Images