WO2024019158A1 - 粘着シートの製造方法及び粘着シート付き光学フィルムの製造方法 - Google Patents
粘着シートの製造方法及び粘着シート付き光学フィルムの製造方法 Download PDFInfo
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- WO2024019158A1 WO2024019158A1 PCT/JP2023/026819 JP2023026819W WO2024019158A1 WO 2024019158 A1 WO2024019158 A1 WO 2024019158A1 JP 2023026819 W JP2023026819 W JP 2023026819W WO 2024019158 A1 WO2024019158 A1 WO 2024019158A1
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- adhesive sheet
- pressure
- sensitive adhesive
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- optical film
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
Definitions
- the present invention relates to a method of manufacturing a pressure-sensitive adhesive sheet and a method of manufacturing an optical film with a pressure-sensitive adhesive sheet.
- Various image display devices typified by liquid crystal display devices and electroluminescent (EL) display devices, generally include an optical laminate that includes an optical film such as a polarizing film and an adhesive sheet.
- Adhesive sheets are usually used for bonding between optical films included in an optical laminate and for bonding an optical laminate and an image display panel.
- a typical pressure-sensitive adhesive sheet is a sheet that is cured by polymerizing and crosslinking a group of monomers including acrylic monomers, silicone monomers, and the like.
- Patent Document 1 discloses a method (photocuring method) of forming an adhesive sheet by irradiating a coating layer containing a photocurable composition with light. Further, Patent Document 1 discloses a method of reducing the amount of monomer remaining in a formed adhesive sheet by heating and drying.
- the problem of odor will occur.
- the anchoring force of the adhesive sheet to the object to be bonded may be reduced.
- the present invention aims to provide a technology suitable for producing a pressure-sensitive adhesive sheet in which the amount of residual monomer is reduced and a decrease in anchoring force is suppressed.
- the present invention By performing surface modification treatment using active energy rays on a first adhesive sheet containing a monomer polymer and residual monomer, the amount of the residual monomer is reduced compared to the first adhesive sheet.
- a method for producing a pressure-sensitive adhesive sheet the method comprising: obtaining a second pressure-sensitive adhesive sheet, I will provide a.
- the invention provides: A method for producing an optical film with a pressure-sensitive adhesive sheet, the method comprising forming an optical film with a pressure-sensitive adhesive sheet by disposing an optical film on the surface of the second pressure-sensitive adhesive sheet formed by the method for producing a pressure-sensitive adhesive sheet of the present invention; I will provide a.
- FIG. 1 is a schematic diagram for explaining an example of a method for manufacturing a pressure-sensitive adhesive sheet of the present invention.
- FIG. 1 is a schematic diagram for explaining an example of a method for manufacturing a pressure-sensitive adhesive sheet of the present invention.
- FIG. 3 is a schematic diagram for explaining an example of a method of forming a first adhesive sheet.
- FIG. 3 is a schematic diagram for explaining an example of a method of forming a first adhesive sheet.
- FIG. 3 is a schematic diagram for explaining an example of a method of forming a first adhesive sheet.
- FIG. 3 is a schematic diagram for explaining an example of a method of forming a first adhesive sheet.
- FIG. 1 is a schematic diagram for explaining an example of a method for manufacturing a pressure-sensitive adhesive sheet of the present invention.
- BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram for explaining an example of a method for manufacturing an optical film with a pressure-sensitive adhesive sheet of the present invention.
- BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram for demonstrating an example of the manufacturing method of the optical film with an adhesive sheet of this invention.
- FIG. 1 is a schematic diagram for explaining an example of a method for manufacturing an optical film with a pressure-sensitive adhesive sheet of the present invention.
- the method for manufacturing a pressure-sensitive adhesive sheet according to the first aspect of the present invention includes: By performing surface modification treatment using active energy rays on a first adhesive sheet containing a monomer polymer and residual monomer, the amount of the residual monomer is reduced compared to the first adhesive sheet. and obtaining a second pressure-sensitive adhesive sheet.
- the amount of the residual monomer in the second pressure-sensitive adhesive sheet is 5000 ppm (weight basis) or less.
- the amount of the residual monomer in the first adhesive sheet is 6000 ppm or more (by weight).
- the surface modification treatment includes corona treatment, plasma treatment, excimer UV light treatment, and flame treatment. at least one selected from the group consisting of processing.
- the surface modification treatment is performed in an atmosphere with an oxygen concentration of 20% by volume or less.
- the atmosphere is an inert gas atmosphere.
- the surface modification treatment is performed on the exposed surface of the first pressure-sensitive adhesive sheet. do.
- the first pressure-sensitive adhesive sheet is formed by a monomer group and/or a partial polymerization of the monomer group.
- This is a pressure-sensitive adhesive sheet formed from a photocurable composition containing a substance.
- the monomer group includes a (meth)acrylic monomer.
- the first pressure-sensitive adhesive sheet is formed by polymerizing a monomer group and/or a partial polymerization of the monomer group.
- the method further includes forming a coating layer containing a photocurable composition containing a substance by irradiating the coating layer with light.
- the light is applied to the first pressure-sensitive adhesive sheet into a laminate including the base sheet, the coating layer, and the release liner in this order. Form by irradiating.
- the light is different from the active energy ray.
- the method for producing an optical film with a pressure-sensitive adhesive sheet according to the thirteenth aspect of the present invention includes: The method includes arranging an optical film on the surface of the second adhesive sheet formed by the manufacturing method according to any one of the first to twelfth aspects to form an optical film with an adhesive sheet.
- the surface is the surface that has been subjected to the surface modification treatment.
- the optical film comprises at least one film selected from the group consisting of a polarizing film and a retardation film. include.
- the anchoring force of the second adhesive sheet with respect to the optical film is 12 N/
- the optical film with the pressure-sensitive adhesive sheet having a thickness of 25 mm or more is formed.
- the present inventor came up with the idea of reducing the amount of residual monomer by surface-modifying the adhesive sheet using active energy rays, conducted studies based on this idea, and completed the present invention. According to the surface modification treatment using active energy rays, it is possible to reduce the amount of residual monomer contained in the pressure-sensitive adhesive sheet, and it is also possible to suppress a decrease in anchoring force.
- the second adhesive sheet 2 is formed by subjecting the first adhesive sheet 1 to surface modification treatment using active energy rays 21 .
- the first pressure-sensitive adhesive sheet 1 contains a monomer polymer and residual monomer. Residual monomers are typically unreacted monomers in the polymerization reaction that forms the polymer. In the second adhesive sheet 2, the amount of residual monomer is reduced compared to the first adhesive sheet 1.
- the surface modification treatment is actually performed on the surface 12 of the first pressure-sensitive adhesive sheet 1, which is the exposed surface. More specifically, the surface modification treatment is performed by irradiating the surface 12 with active energy rays 21 .
- the aspect of the surface modification treatment is not limited to this example.
- the surface modification treatment is performed on one surface 12 of the first pressure-sensitive adhesive sheet 1.
- the surface modification treatment may be performed on both surfaces 12 and 13 of the first adhesive sheet 1.
- the surface 12 that has been subjected to the surface modification treatment becomes a modification treated surface 14.
- FIG. 2 Another example of the method for manufacturing the pressure-sensitive adhesive sheet of the present invention will be described with reference to FIG. 2.
- a long first adhesive sheet 1 is subjected to surface modification treatment using active energy rays 21, and a second long adhesive sheet 2 is formed.
- the surface modification treatment is performed when the first adhesive sheet 1 passes through the processing device 22. Further, the surface modification treatment is carried out while conveying the first adhesive sheet 1 and the second adhesive sheet 2 while being laminated on the elongated base sheet 11.
- the method of FIG. 2 is particularly suitable for mass production of the second adhesive sheet 2.
- the amount of residual monomer in the second adhesive sheet 2 may be 5000 ppm or less, 4500 ppm or less, 4000 ppm or less, 3500 ppm or less, 3000 ppm or less, 2500 ppm or less, 2000 ppm or less, 1500 ppm or less, or even 1000 ppm or less. good.
- the lower limit of the amount of residual monomer is, for example, 30 ppm or more. In this specification, all "ppm" are based on weight.
- the amount of residual monomer in the first adhesive sheet 1 is, for example, 6000 ppm or more, 8000 ppm or more, 10000 ppm or more, 13000 ppm or more, 15000 ppm or more, 18000 ppm or more, 20000 ppm or more, 25000 ppm or more, 30000 ppm or more, 35000 ppm or more, and even 40000 ppm or more. more than pm It may be.
- the upper limit of the amount of residual monomer is, for example, 50,000 ppm or less.
- the amount of residual monomer in the first adhesive sheet 1 and the second adhesive sheet 2 can be evaluated by gas chromatogram (GC) analysis.
- GC gas chromatogram
- the surface modification treatment is, for example, at least one selected from the group consisting of corona treatment, plasma treatment, excimer UV light treatment, and flame treatment, and may be corona treatment and/or plasma treatment. There may be.
- the active energy ray 21 may be at least one selected from the group consisting of an electron beam, an ion beam, a plasma beam, and an ultraviolet ray.
- Each surface modification treatment can be performed by a corresponding known treatment device 22.
- the surface modification treatment can be carried out in an atmospheric atmosphere, it may also be carried out in an atmosphere in which the oxygen concentration is reduced compared to the atmosphere (oxygen concentration 20.9% by volume).
- Surface modification treatment in an atmosphere with reduced oxygen concentration is particularly suitable for reducing the amount of residual monomer while limiting the degree of treatment.
- the surface modification treatment is performed at an oxygen concentration of 20% by volume or less, 15% by volume or less, 10% by volume or less, 8% by volume or less, 6% by volume or less, 5% by volume or less, 3% by volume or less, 1% by volume or less, 0. It may be carried out in an atmosphere of 5% by volume or less, or even 0.3% by volume or less.
- the lower limit of the oxygen concentration may be 0.01 volume % or more, 0.1 volume % or more, or even 0.5 volume % or more.
- An example of an atmosphere with reduced oxygen concentration is a mixed atmosphere of oxygen and an inert gas. Examples of inert gases are argon and nitrogen. However, the inert gas is not limited to the above example.
- the anchoring power of the modification treated surface 14 of the second pressure-sensitive adhesive sheet 2 can be improved compared to before the treatment.
- Surface modification treatment in an atmosphere with a reduced oxygen concentration can reduce the anchorage of the modified surface 14, especially when the degree of treatment is increased (for example, when the discharge amount is 10 kJ/m 2 or more in corona treatment). Particularly suitable for increasing strength.
- the anchoring force is, for example, an anchoring force on a resin film such as an optical film. Furthermore, depending on the type of surface modification treatment, the risk of fire can be reduced even when the degree of treatment is increased by performing it in an atmosphere with a reduced oxygen concentration.
- the surface modification treatment may be performed in an atmosphere substantially free of oxygen.
- substantially free of oxygen means that the oxygen concentration is less than 0.1% by volume, preferably less than 0.05% by volume, more preferably less than 0.01% by volume.
- An example of a substantially oxygen-free atmosphere is an inert gas atmosphere.
- the surface modification treatment may be performed in an inert gas atmosphere.
- the surface modification treatment may be carried out under normal pressure (1 atmosphere).
- the conditions for the surface modification treatment are, for example, 0.6 to 100 kJ/m 2 in terms of discharge amount.
- the lower limit of discharge amount is 1kJ/ m2 or more, 2kJ/ m2 or more, 5kJ/m2 or more, 7kJ/ m2 or more, 10kJ/ m2 or more, 13kJ/m2 or more, 15kJ/m2 or more, 20kJ/ m2 or more.
- the upper limit of the discharge amount is 70 kJ/m 2 or less, 60 kJ/m 2 or less, 50 kJ/m 2 or less, 45 kJ/m 2 or less, 40 kJ/m 2 or less, 30 kJ/m 2 or less, 20 kJ/m 2 or less, and even It may be 18 kJ/m 2 or less.
- the discharge amount may be 1 to 18 kJ/m 2 .
- the discharge amount may be 1 to 60 kJ/m 2 .
- An example of the base sheet 11 is the same as an example of a base sheet 31 described later that can be used to form the first adhesive sheet 1.
- the base sheet 31 used to form the first adhesive sheet 1 may be used as the base sheet 11.
- the first pressure-sensitive adhesive sheet 1 may be a pressure-sensitive adhesive sheet (photocurable pressure-sensitive adhesive sheet) formed from a photocurable composition containing a monomer group and/or a partial polymer of the monomer group.
- the first adhesive sheet 1 is not limited to the above example as long as it contains a monomer polymer and a residual monomer.
- the first adhesive sheet 1 may be an adhesive sheet (thermosetting adhesive sheet) formed from a thermosetting composition containing a monomer group and a solvent. Note that the amount of residual monomer contained tends to be larger in photocurable adhesive sheets than in thermosetting adhesive sheets.
- the manufacturing method of the present invention is particularly advantageous when the first adhesive sheet 1 (and the second adhesive sheet 2 formed from the adhesive sheet) is of a photocurable type.
- the first pressure-sensitive adhesive sheet 1, which is a photocurable type, is produced by, for example, irradiating light 35 onto a first laminate 34 that includes a base sheet 31, a coating layer 32 containing a photocurable composition, and a release liner 33 in this order.
- the first adhesive sheet 1 is formed from the coating layer 32 by irradiation with the light 35 (FIG. 3C).
- the formed first adhesive sheet 1 is sandwiched between the base sheet 31 and the release liner 33 and constitutes a part of the second laminate 36 until the release liner 33 is peeled off.
- the light 35 is irradiated from the base sheet 31 side.
- the light 35 passes through the base sheet 31, reaches the coating layer 32, and cures the coating layer 32.
- the irradiation with the light 35 may be performed from the release liner 33 side, or from both sides of the release liner 33 and the base sheet 31 (FIG. 3B).
- the manufacturing method of the present invention may further include the above step of forming the first adhesive sheet 1.
- the first pressure-sensitive adhesive sheet 1 is prepared by irradiating the coating layer 32 containing the photocurable composition containing the monomer group and/or the partial polymer of the monomer group with the light 35. It may further include forming.
- the first adhesive sheet 1 may be formed by irradiating the first laminate 34 including the base sheet 31, the coating layer 32, and the release liner 33 in this order with the light 35.
- the step of forming the first adhesive sheet 1 and the surface modification treatment for the formed first adhesive sheet 1 may be performed continuously.
- FIG. 4 An example of the manufacturing method of the present invention, which further includes a step of forming the first adhesive sheet 1, will be described with reference to FIG. 4.
- a coating layer 32 of a photocurable composition is formed on one side of a long base sheet 31 fed out from a roll 41 using a coating device 42 .
- the elongated release liner 33 unwound from the rolled body 43 is placed on the coating layer 32 to form the elongated first laminate 34 .
- the first laminate 34 is irradiated with light 35 from the irradiation device 44 to form the elongated first adhesive sheet 1 .
- the release liner 33 is peeled off from the second laminate 36 including the first adhesive sheet 1 and wound up into a roll 45 .
- the above steps are performed while conveying the base sheet 31 and release liner 33.
- the exposed surface (surface 12) of the first pressure-sensitive adhesive sheet 1 formed by peeling off the release liner 33 is subjected to surface modification treatment by the treatment device 22, and the second adhesive sheet having the modified surface 14 is An adhesive sheet 2 is formed.
- the above steps after peeling off the release liner 33 are carried out while conveying the base sheet 31 (11).
- the method of FIG. 4 is particularly suitable for mass production of the second adhesive sheet 2.
- Liner base material An example of the base material of the release liner 33 (hereinafter referred to as "liner base material”) is a resin film.
- resins that can be included in the liner base material are 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, polyarylate, and polyphenylene sulfide.
- the resin is preferably a polyester such as polyethylene terephthalate.
- the release liner 33 may have a light 35 transmittance, or may have a light 35 transmittance comparable to that of the base sheet 31.
- the thickness of the release liner 33 is, for example, 10 to 200 ⁇ m, and may be 25 to 150 ⁇ m.
- the release liner 33 may include layers other than the liner base material.
- the release liner 33 may include a release layer.
- the release liner 33 includes, for example, a liner base material and a release layer formed on one surface of the liner base material. This release liner 33 can be used so that the release layer is on the coating layer 32 side.
- the release layer is typically a cured layer of a release agent composition containing a release agent.
- Various mold release agents can be used as the mold release agent, such as a silicone mold release agent, a fluorine mold release agent, a long chain alkyl mold release agent, a fatty acid amide mold release agent, and silica powder.
- the release liner 33 may include a cured layer of a release agent composition containing a silicone release agent as a main component (hereinafter referred to as "silicone release layer").
- the silicone release layer is particularly suitable for achieving both adhesion and releasability to the first pressure-sensitive adhesive sheet 1.
- the main component means the component with the largest content rate.
- the silicone mold release agent is, for example, various types of curable silicone materials such as addition reaction type, condensation reaction type, ultraviolet curable type, electron beam curable type, and solvent-free type, with addition reaction curable silicone materials being preferred.
- the addition reaction-curable silicone material is particularly suitable for forming a release layer that has both adhesion and releasability to the first pressure-sensitive adhesive sheet 1.
- the curable silicone material may be a silicone-modified resin in which reactive silicone is introduced into an organic resin such as urethane, epoxy, or alkyd resin by graft polymerization or the like.
- An example of an addition reaction-curable silicone material is a polyorganosiloxane having a vinyl group or an alkenyl group in the molecule.
- the addition reaction curable silicone material does not need to have a hydrosilyl group.
- alkenyl groups are 3-butenyl, 4-pentenyl, 5-hexenyl, 6-heptenyl, 7-octenyl, 8-nonenyl, 9-decenyl, 10-undecenyl, and 11-dodecenyl. It is the basis.
- polyorganosiloxanes examples include polyalkylalkylsiloxanes such as polydimethylsiloxane, polydiethylsiloxane, and polymethylethylsiloxane, polyalkylarylsiloxanes, and a plurality of Si atom-containing monomers such as poly(dimethylsiloxane-diethylsiloxane). It is a copolymer.
- the polyorganosiloxane is preferably polydimethylsiloxane.
- a mold release agent composition containing a silicone mold release agent as a main component usually contains a crosslinking agent.
- crosslinking agents are polyorganosiloxanes containing hydrosilyl groups.
- the crosslinking agent may have two or more hydrosilyl groups in one molecule.
- the silicone mold release agent composition may contain a curing catalyst.
- a curing catalyst is a platinum-based catalyst.
- platinum-based catalysts are chloroplatinic acid, olefin complexes of platinum, and olefin complexes of chloroplatinic acid.
- the amount of the platinum-based catalyst used is, for example, 10 to 1000 ppm (by weight, in terms of platinum) based on the total solid content of the composition.
- the silicone mold release agent composition may contain additives.
- additives are release control agents and adhesion promoters.
- release control agents are unreacted silicone resins, and more specific examples are organosiloxanes such as octamethylcyclotetrasiloxane, and MQ resins.
- the total amount of the peel control agent and adhesion improver used is, for example, 1 to 30% by weight based on the total solid content of the composition.
- Further examples of additives are fillers, antistatic agents, antioxidants, UV absorbers, plasticizers and colorants.
- the amount of further additives used is, for example, up to 10% by weight in total, based on the total solids content of the composition.
- the silicone mold release agent composition may contain an organic solvent.
- 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.
- Solvent Alcohol solvent such as methanol, ethanol, butanol. Two or more types of organic solvents may be included. The amount of organic solvent used is preferably 80 to 99.9% by weight of the silicone mold release agent composition.
- the release layer can be formed, for example, by heating and drying a coating film containing a release agent composition formed on a liner base material.
- Application of the release agent composition includes roll coating, kiss roll coating, gravure coating, reverse coating, roll brushing, spray coating, dip roll coating, bar coating, knife coating, air knife coating, curtain coating, lip coating, and die coating.
- Various coating methods can be applied. For example, hot air drying can be used for heating and drying.
- the heating temperature and time vary depending on the heat resistance of the liner base material, but are usually about 80 to 150°C and about 10 seconds to 10 minutes. If necessary, irradiation with active energy rays such as ultraviolet rays may be used in combination.
- the thickness of the release layer 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 65 nm or less.
- 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 50 nm or more.
- the release liner 33 may be sheet-shaped or elongated.
- Base material sheet An example of the base sheet 31 is a resin film. Examples of resins included in the base sheet 31 are the same as examples of resins that can be included in the liner base material.
- the base sheet 31 has excellent transparency for light 35.
- the thickness of the base sheet 31 is, for example, 10 to 200 ⁇ m, and may be 25 to 150 ⁇ m.
- the base sheet 31 may include a release layer on the surface facing the coating layer 32.
- Examples of the release layer that the base sheet 31 can include and its manufacturing method are the same as the examples of the release layer that the release liner 33 can include and its manufacturing method.
- Both the release liner 33 and the base sheet 31 may include a release layer.
- both mold release layers may be formed from mold release agent compositions containing the same mold release agent as a main component. Further, the thicknesses of both release layers may be different, and for example, the release layer included in the base sheet 31 may be thicker.
- a sheet can usually be selected that has a greater peeling force with the first adhesive sheet 1 than the release liner 33.
- the base sheet 31 may be sheet-shaped or elongated.
- the photocurable composition is a composition from which the first pressure-sensitive adhesive sheet 1 can be formed from the coating layer 32 by irradiation with light 35 .
- 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, is 50% by weight or more, 60% by weight or more, 70% by weight or more, and even 80% by weight. % or more.
- an acrylic pressure-sensitive adhesive sheet containing a (meth)acrylic polymer and a crosslinked product thereof as main components can be formed.
- the photocurable composition is not limited to the above example.
- (meth)acrylic means acrylic and methacryl.
- (Meth)acrylate means acrylate and methacrylate.
- An example of the (meth)acrylic monomer is a (meth)acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms in the side chain.
- the number of carbon atoms in the alkyl group may be 7 or less, 6 or less, 5 or less, or even 4 or less.
- the alkyl group may be linear or branched.
- Examples of (meth)acrylic acid alkyl esters are methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, s-butyl (meth)acrylate.
- t-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
- the content of (meth)acrylic acid alkyl ester in the monomer group is, for example, 40% by weight or more, 50% by weight or more, 60% by weight or more, 70% by weight or more, 80% by weight or more, 85% by weight or more, 90% by weight. % or more, and even 95% or more by weight.
- the weight of the partially polymerized product is converted to the weight of each monomer before polymerization.
- the monomer group may include a carboxyl group-containing monomer.
- the carboxyl group-containing monomer may be a (meth)acrylic monomer, or in other words, the (meth)acrylic monomer may 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, 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, and even 5% by weight or less. It may be less than % by weight.
- the lower limit of the content may be, for example, 0.1% by weight or more, 0.5% by weight or more, or even 1% by weight or more.
- the monomer group does not need to contain carboxyl group-containing monomers.
- the monomer group may include a hydroxy group-containing monomer.
- the hydroxy group-containing monomer may be a (meth)acrylic monomer, or in other words, the (meth)acrylic monomer may include a hydroxy group-containing monomer.
- the hydroxy group-containing monomer can contribute to improving the cohesive force of the pressure-sensitive adhesive sheet. Examples of hydroxy group-containing monomers include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, and (meth)acrylate.
- the hydroxy group-containing monomer is preferably 2-hydroxyethyl (meth)acrylate or 4-hydroxybutyl (meth)acrylate.
- the content of the hydroxy group-containing monomer in the monomer group is, for example, 5% by weight or less, 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. It may be less than 0.3% by weight, less than 0.2% by weight, and even less than 0.1% by weight.
- the lower limit of the content may be, for example, 0.01% by weight or more, 0.03% by weight or more, and even 0.05% by weight or more.
- the monomer group does not need to contain hydroxy group-containing monomers.
- each of the above-mentioned monomers may be included as a partially polymerized product.
- the partial polymer may be either a homopolymer or a copolymer.
- the partial polymer can contribute to stable formation of the coating layer 32 by appropriately increasing the viscosity of the photocurable composition.
- the photocurable composition usually contains a photopolymerization initiator.
- a photopolymerization initiator is a photoradical generator that generates radicals using visible light and/or ultraviolet light having a wavelength shorter than 450 nm.
- 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; 2,2-diethoxyacetophenone, 2,2-dimethoxy-2- Substituted acetophenones such as phenylacetophenone; ⁇ -hydroxyalkylphenones such as 1-hydroxycyclohexyl-phenylketone; substituted alphaketols such as 2-methyl-2-hydroxypropiophenone; aromatic sulfonyl chlorides such as 2-naphthalenesulfonyl chloride; Photoactive oximes such as 1-phenyl-1,1-propanedione-2-(o-ethoxycarbonyl)-oxime; benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone
- the amount of the photopolymerization initiator in the photocurable composition is, for example, 0.02 to 10 parts by weight, and 0.05 to 5 parts by weight, based on 100 parts by weight of the monomer group and its partial polymer. There may be.
- the photocurable composition may contain a crosslinking agent.
- a crosslinking agent is a polyfunctional monomer having two or more polymerizable functional groups in one molecule.
- the polyfunctional monomer may be a (meth)acrylic monomer.
- a monomer having a polymerizable functional group such as a methylol group.
- the polyfunctional monomer is preferably a monomer having two or more C ⁇ C bonds in one molecule.
- polyfunctional monomers are (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, tetramethylolmethane tri(meth)acrylate, and other polyfunctional acrylates (ester compounds of polyhydric alcohol and (meth)acrylic acid, etc.); They are allyl (meth)acrylate, vinyl
- the polyfunctional monomer is preferably a polyfunctional acrylate, more preferably trimethylolpropane tri(meth)acrylate, hexanediol di(meth)acrylate, or dipentaerythritol hexa(meth)acrylate.
- the blending amount of the crosslinking agent varies depending on the molecular weight, the number of functional groups, etc., 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 per 100 parts by weight of the monomer group and its partial polymer.
- the amount may be less than 1 part by weight, or even less than 0.5 part by weight.
- the lower limit of the blending amount is, for example, 0.01 part by weight or more, and may even be 0.05 part by weight or more.
- the photocurable composition may contain additives other than those mentioned above.
- additives are chain transfer agents, silane coupling agents, viscosity modifiers, tackifiers, plasticizers, softeners, anti-aging agents, fillers, colorants, antioxidants, surfactants, and antistatic agents. and an ultraviolet absorber.
- the content of the solvent in the photocurable composition is, for example, 5% by weight or less, 4% by weight or less, 3% by weight or less, 2% by weight or less, 1% by weight or less, and even 0.5% by weight or less. You can.
- the photocurable composition may be substantially free of solvent. "Substantially free of solvent” means that the content of solvents derived from additives etc. is, for example, 0.1% by weight or less, preferably 0.05% by weight or less, more preferably 0.01% by weight or less. The intention is to allow it.
- 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 32.
- the first laminate 34 is, for example, formed by forming a coating layer 32 on a base sheet 31 (or a release liner 33), and disposing a release liner 33 (or a base sheet 31) on the formed coating layer 32. It can be formed by Further, a first laminate 34 is formed by pouring and applying the photocurable composition into the space between the base sheet 31 and the release liner 33 which are held at a predetermined interval so that their main surfaces face each other. You may.
- the coating layer 32 can be formed using a roll coat, a kiss roll coat, a gravure coat, a reverse coat, a roll brush, a spray coat, a dip roll coat, a bar coat, a knife coat, an air knife coat, a curtain coat, a lip coat, a die coat, etc.
- Various application methods can be applied.
- the thickness of the coating layer 32 can be adjusted depending on the desired thickness of the second adhesive sheet 2, and may be, for example, 5 to 100 ⁇ m, 5 to 50 ⁇ m, 5 to 25 ⁇ m, or even 5 to 20 ⁇ m. good.
- the first laminate 34 may include further layers other than the base sheet 31, the coating layer 32, and the release liner 33.
- the further layer may be arranged on the side of the base sheet 31 and/or release liner 33 opposite to the side of the coating layer 32.
- the coating layer 32 is preferably in contact with the base sheet 31 and the release liner 33.
- the light 35 irradiated to the first laminate 34 is, for example, visible light or ultraviolet light having a wavelength shorter than 450 nm.
- the light 35 may include light with a wavelength in the same region as the absorption wavelength of the photopolymerization initiator included in the photocurable composition.
- the light 35 may be irradiated with short wavelength light having a wavelength of 200 nm or less, preferably 300 nm or less, which is cut by a filter or the like. Cutting the short wavelength light means that the base sheet 31 and/or release liner 33 are Suitable for suppressing deterioration of
- the light source of the light 35 is, for example, a light irradiation device including an ultraviolet irradiation lamp.
- ultraviolet irradiation lamps examples include ultraviolet LEDs, low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, extra-high-pressure mercury lamps, metal halide lamps, xenon lamps, microwave-excited mercury lamps, black light lamps, chemical lamps, germicidal lamps, and low-pressure discharge mercury lamps. , an excimer laser. Two or more ultraviolet irradiation lamps may be combined.
- Irradiation of the light 35 may be continuous or intermittent.
- the irradiation intensity of the light 35 is, for example, 1 to 20 mW/cm 2 .
- the irradiation time of the light 35 is, for example, 5 minutes to 5 hours.
- the cumulative amount of light 35 to the first laminate 34 is, for example, 100 to 5000 mJ/cm 2 .
- the light 35 may be different from the active energy ray 21.
- the light 35 and the active energy ray 21 may be different in type.
- the active energy rays 21 and the light 35 may have different wavelengths.
- the wavelength may be 200 nm or less.
- the polymerization rate of the monomer group in the first adhesive sheet 1 is preferably 90% or more.
- the polymerization rate may be 95% or more, 96% or more, 97% or more, or even 98% or more.
- the gel fraction of the first adhesive sheet 1 is, for example, 50% or more, and may be 75% or more, 80% or more, or even 85% or more.
- the peeling force of the release liner 33 to the first adhesive sheet 1 may be smaller than the peeling force of the base sheet 31 to the first adhesive sheet 1.
- the second adhesive sheet 2 may be of a photocurable type.
- the thickness of the second adhesive sheet 2 is, for example, 2 to 70 ⁇ m, and may be 2 to 50 ⁇ m, 5 to 40 ⁇ m, 10 to 30 ⁇ m, 10 to 25 ⁇ m, or even 10 to 20 ⁇ m.
- the gel fraction of the second adhesive sheet 2 is, for example, 50% or more, and may be 75% or more, 80% or more, or even 85% or more.
- the second adhesive sheet 2 can be used, for example, in an optical laminate including an optical film.
- the second adhesive sheet 2 may be used for optical laminates.
- the optical laminate may be an optical film with an adhesive sheet.
- the second adhesive sheet 2 may be used so that the modified surface 14 is on the optical film side, or may be used so that it is in contact with the optical film.
- the purpose and method of using the second adhesive sheet 2 are not limited to the above example.
- the optical film 3 is placed on the modified surface 14 of the second adhesive sheet 2 placed on the base sheet 11 to form the optical film 51 with the adhesive sheet.
- the optical film with adhesive sheet 51 includes a base sheet 11, a second adhesive sheet 2, and an optical film 3 in this order.
- the adhesive sheet-attached optical film 51 can be used as it is or after peeling off the base sheet 11, for example, as an optical laminate including the second adhesive sheet 2 and the optical film 3 in an image display device or the like.
- the optical laminate may be bonded to an object (for example, an image forming panel) via the second adhesive sheet 2.
- the use of the adhesive sheet-attached optical film 51 is not limited to the above example. Further members such as an optical film may be arranged on the exposed surface 37 formed by peeling the base sheet 11 from the optical film 51 with an adhesive sheet.
- An optical film 52 with a pressure-sensitive adhesive sheet including the optical film 3B and the optical film 3B in this order can be formed (see FIG. 6).
- the optical films 3A and 3B may be the same or different from each other.
- the optical film 3 may be placed directly or indirectly on the modified surface 14 and the exposed surface 37. In other words, even if the optical film 3 is placed in contact with the modified surface 14 or the exposed surface 37, it is not placed with another layer sandwiched between the modified surface 14 or the exposed surface 37. You can.
- the surface of the optical film 3 that comes into contact with the second pressure-sensitive adhesive sheet 2 may be a surface that has been subjected to surface modification treatment using active energy rays. This aspect is particularly suitable for improving the anchoring force between the second adhesive sheet 2 and the optical film 3.
- Examples of the surface modification treatment for the optical film 3 are the same as those for the first pressure-sensitive adhesive sheet 1, including preferred examples.
- FIG. 7 Another example of the method for manufacturing the optical film with adhesive sheet of the present invention will be described with reference to FIG. 7.
- a long optical film 3 is placed on the modified surface 14 of the second adhesive sheet 2 formed by the method shown in FIG. 4 to form a long optical film 51 with adhesive sheet.
- the optical film 3 is unwound from the roll 46 and placed on the modification treatment surface 14 .
- the above steps are performed while conveying the base sheet 31 (11).
- the formation of the second adhesive sheet 2 and the formation of the adhesive sheet-attached optical film 51 may be performed continuously.
- the formation of the first adhesive sheet 1, the formation of the second adhesive sheet 2, and the formation of the adhesive sheet-attached optical film 51 may be performed continuously.
- the method shown in FIG. 7 is particularly suitable for mass production of the optical film 51 with adhesive sheet.
- the optical film 3 is, for example, a film containing at least one selected from the group consisting of a polarizing film and a retardation film.
- the optical film 3 may be a laminated film including a polarizing film and/or a retardation film.
- the optical film 3 may include a glass film.
- the optical film 3 is not limited to the above example.
- the polarizing film includes a polarizer.
- a polarizing film typically includes a polarizer and a protective film (transparent protective film).
- the protective film is placed, for example, in contact with the main surface (the surface with the widest area) of the polarizer.
- a polarizer may be placed between two protective films.
- the protective film may be placed on at least one surface of the polarizer.
- the polarizer is not particularly limited, and examples include hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, partially saponified ethylene/vinyl acetate copolymer films, iodine, and dichroism. Examples include those obtained by adsorbing dichroic substances such as dyes and uniaxially stretched; polyene-based oriented films such as dehydrated polyvinyl alcohol and dehydrochloric acid treated polyvinyl chloride.
- a polarizer typically consists of a polyvinyl alcohol film (polyvinyl alcohol films include 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, 80 ⁇ m or less, 50 ⁇ m or less, 30 ⁇ m or less, 25 ⁇ m or less, or even 20 ⁇ m or less.
- the lower limit of the thickness of the polarizer is not particularly limited, and may be, for example, 1 ⁇ m or more, 5 ⁇ m or more, 10 ⁇ m or more, or even 15 ⁇ m or more.
- a thin polarizer (for example, 20 ⁇ m or less in thickness) has suppressed dimensional changes and can contribute to improving the durability of the optical laminate, especially the durability under high temperatures.
- thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, etc.
- thermoplastic resins include cellulose resins such as triacetylcellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, and cyclic resins.
- examples include polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof.
- the material of the protective film may be a thermosetting resin or an ultraviolet curing resin such as (meth)acrylic, urethane, acrylic urethane, epoxy, or silicone.
- the materials of the two protective films may be the same or different.
- a protective film made of a thermoplastic resin is bonded to one main surface of a polarizer via an adhesive, and a protective film made of a thermosetting resin or ultraviolet curable resin is attached to the other main surface of the polarizer.
- a protective film made of molded resin may be attached.
- the protective film may contain one or more types of arbitrary additives. Examples of additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, color inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, colorants, and the like.
- the thickness of the protective film can be determined as appropriate, but is generally about 10 to 200 ⁇ m from the viewpoint of strength, workability such as handleability, thin film property, etc.
- a polarizer and a protective film are usually attached to each other via a water-based adhesive or the like.
- water-based adhesives include isocyanate adhesives, polyvinyl alcohol adhesives, gelatin adhesives, vinyl latex, water-based polyurethanes, and water-based polyesters.
- adhesives other than the above adhesives include ultraviolet curable adhesives and electron beam curable adhesives.
- Electron beam-curable adhesives for polarizing plates exhibit suitable adhesion to various types of protective films.
- the adhesive may include a metal compound filler.
- a retardation film or the like can also be formed on the polarizer instead of the protective film. It is also possible to provide another protective film, a retardation film, etc. on the protective film.
- a hard coat layer may be provided on the surface opposite to the surface bonded to the polarizer, and treatments for the purpose of anti-reflection, anti-sticking, diffusion, anti-glare, etc. can also be applied. .
- the polarizing film may be a circularly polarizing film.
- the retardation film one obtained by stretching a polymer film or one obtained by aligning and fixing a liquid crystal material can be used.
- the retardation film has, for example, birefringence in the plane and/or in the thickness direction.
- the retardation film includes a retardation film for antireflection (see JP-A-2012-133303 [0221], [0222], and [0228]) and a retardation film for viewing angle compensation (see JP-A 2012-133303 [0221], [0222], and [0228]). 0225], [0226]), an obliquely oriented retardation film for viewing angle compensation (see JP-A-2012-133303 [0227]), and the like.
- the specific structure of the retardation film for example, retardation value, arrangement angle, three-dimensional birefringence, single layer or multilayer, etc., is not particularly limited, and any known retardation film can be used.
- the thickness of the retardation film is preferably 20 ⁇ m or less, more preferably 10 ⁇ m or less, still more preferably 1 to 9 ⁇ m, particularly preferably 3 to 8 ⁇ m.
- the retardation film may include, for example, a quarter-wave plate and/or a half-wave plate in which a liquid crystal material is oriented and fixed.
- the anchoring force of the second adhesive sheet 2 to the optical film 3 may be 10 N/25 mm or more, or 12 N/25 mm or more.
- optical films 51 and 52 with adhesive sheets may be formed in which the anchoring force of the second adhesive sheet 2 with respect to the optical film 3 is 10 N/25 mm or more, further 12 N/25 mm or more.
- the anchoring force may be 13 N/25 mm or more, 14 N/25 mm or more, 15 N/25 mm or more, 16 N/25 mm or more, or even 17 N/25 mm or more.
- the upper limit of the anchoring force is, for example, 50 N/25 mm or less, and may be 30 N/25 mm or less.
- a film containing (meth)acrylic resin as a main component may be used as the optical film 3 such as a protective film for a polarizer.
- the adhesive strength between an acrylic film and an adhesive sheet generally tends to be low.
- the second adhesive sheet 2 having a second anchoring force within the above range is particularly suitable for bonding to the optical film 3 which is an acrylic film.
- the anchoring force of the second adhesive sheet 2 with respect to the optical film 3 can be measured by the following method.
- the laminate of the optical film 3 and the second pressure-sensitive adhesive sheet 2 is cut into a piece having a width of 25 mm and a length of 150 mm to prepare a test piece.
- the laminate may include other layers.
- the entire surface of the optical film 3 included in the test piece was superimposed on a stainless steel test plate via double-sided tape, and a 2 kg roller was moved back and forth once to press them together.
- the second adhesive sheet 2 included in the test piece is superimposed on the evaluation sheet, and a 2 kg roller is moved back and forth once to press them together.
- the evaluation sheet has a size of 30 mm width x 150 mm length, and is not particularly limited as long as it does not peel off from the second adhesive sheet 2 during the test.
- the evaluation sheet for example, an ITO film (125 Tetraite OES (manufactured by Oike Kogyo Co., Ltd.), etc.) can be used.
- the second adhesive sheet 2 was peeled off from the optical film 3 at a peeling angle of 180° and a pulling speed of 300 mm/min while holding the evaluation sheet.
- the average value of the force is specified as the anchoring force of the second adhesive sheet 2 with respect to the optical film 3.
- the above test is conducted in an atmosphere of 23°C ⁇ 5°C.
- An image display device may be formed using the optical films 51 and 52 with adhesive sheets.
- the image display device can be formed by, for example, joining optical films 51 and 52 with adhesive sheets and an image display panel. The bonding may be performed using the second adhesive sheet 2.
- the image display device may be an organic EL display or a liquid crystal display. However, the image display device is not limited to the above example.
- the image display device may be an electroluminescence (EL) display, a plasma display (PD), a field emission display (FED), or the like.
- EL electroluminescence
- PD plasma display
- FED field emission display
- the image display device can be used for household appliances, in-vehicle applications, public information displays (PID), and the like.
- Production of release liner B A release liner B having a release layer (thickness: 120 nm) on one side was produced in the same manner as Production Example 1 except that the coating thickness of the release agent composition on the liner base material was changed.
- Retention - Sample preparation method 0.05 g of the sample (adhesive sheet) was collected in a screw bottle, 2.5 mL of ethyl acetate was added, and the mixture was shaken overnight. After filtering the obtained solution with a 0.45 ⁇ m membrane filter, 1 ⁇ L of the filtrate was injected into GC for analysis.
- Release liner A and first adhesive sheet B were prepared in the same manner as in Production Example 2, except that photocurable composition C2 was used instead of photocurable composition C1 and the ultraviolet irradiation time was changed to 480 seconds. (thickness: 20 ⁇ m) and release liner B was formed. The polymerization rate of the first pressure-sensitive adhesive sheet B thus formed was 97.9%. Further, the amount of residual monomer in the first adhesive sheet B was 19,320 ppm.
- Example 1 The release liner B was peeled off from the second laminate produced in Production Example 3, and one side of the first pressure-sensitive adhesive sheet A was exposed. Next, corona treatment was performed on the exposed surface of the first adhesive sheet A at a discharge rate of 14.6 kJ/m 2 in an atmosphere with an oxygen concentration of 0.1% by volume (oxygen-nitrogen mixed atmosphere, 1 atm). A second adhesive sheet was obtained. The amount of residual monomer in the obtained second pressure-sensitive adhesive sheet was 2990 ppm.
- Example 2 to 9 Second adhesive sheets of Examples 2 to 9 were obtained in the same manner as in Example 1 except that the first adhesive sheets shown in Table 3 below were subjected to corona treatment under the conditions shown in Table 3. .
- the processing atmosphere with oxygen concentrations of 1.0% by volume, 0.1% by volume, and 0.01% by volume was an oxygen-nitrogen mixed atmosphere.
- the processing atmosphere with an oxygen concentration of 20.9% by volume was air. Note that the pressure of the processing atmosphere was 1 atm in all cases.
- Comparative example 1 The first adhesive sheet A obtained by peeling off the release liner B from the second laminate produced in Production Example 2 was used as the adhesive sheet a of Comparative Example 1 without performing corona treatment.
- An optical laminate was prepared by disposing a polarizing film D1 on the corona-treated surface of the second pressure-sensitive adhesive sheet produced in the example and on the exposed surface of the pressure-sensitive adhesive sheets a to c of the comparative examples.
- the polarizing film D1 was arranged so that the surface on the side of the transparent protective film made of modified methacrylic resin was in contact with the adhesive sheet.
- the anchoring force between the pressure-sensitive adhesive sheet and the polarizing film was measured by the method described above.
- As the double-sided tape Nitto Denko Corporation's product name "No. 531" was used.
- a SUS304 plate (width 40 mm x length 120 mm) was used as the stainless steel test plate.
- An ITO film (125 Tetraite OES, manufactured by Oike Kogyo) was used as the evaluation sheet.
- Autograph SHIMAZU AG-I 10KN (manufactured by Shimadzu Corporation) was used as a tensile tester.
- Polarizing film D1 used for evaluation of anchoring force was produced as follows. A polyvinyl alcohol film having a thickness of 80 ⁇ m was stretched up to 3 times between rolls having different speed ratios while being dyed for 1 minute in an iodine solution having a concentration of 0.3% at a temperature of 30° C. Next, the film was stretched while being immersed for 0.5 minutes in an aqueous solution containing boric acid at a concentration of 4% and potassium iodide at a concentration of 10% at a temperature of 60°C until the total stretching ratio became 6 times.
- a polarizer with a thickness of 28 ⁇ m was obtained by immersing it in an aqueous solution containing potassium iodide at a concentration of 1.5% and washing it for 10 seconds at a temperature of 30°C, and then drying it at 50°C for 4 minutes.
- Ta A 30 ⁇ m thick transparent protective film made of a modified acrylic polymer having a lactone ring structure was attached to one side of the polarizer using a polyvinyl alcohol adhesive.
- a 47 ⁇ m thick transparent protective film made of a triacetyl cellulose film (manufactured by Konica Minolta, product name "KC4UY”) with a hard coat layer (HC) is attached using a polyvinyl alcohol adhesive.
- Polarizing film D2 was produced by heating and drying for 5 minutes in an oven set at 70°C. Furthermore, the surface of the polarizing film D2 on the side of the transparent protective film made of a modified acrylic polymer was subjected to corona treatment at a discharge amount of 63 W/(m 2 ⁇ min) in the air atmosphere.
- the productivity of the second pressure-sensitive adhesive sheet produced in the example and each pressure-sensitive adhesive sheet of the comparative example was determined as follows.
- the time T is the treatment time required for the second adhesive sheet obtained by performing corona treatment until the amount of residual monomer reaches 10,000 ppm or less by the treatment
- the time T is the treatment time required for the second adhesive sheet obtained without performing corona treatment.
- this is the ultraviolet irradiation time required for the amount of residual monomer to reach 10,000 ppm or less when forming the second laminate from the first laminate.
- the pressure-sensitive adhesive sheet obtained by the production method of the present invention can be used, for example, in optical laminates and image display devices.
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Abstract
Description
モノマーの重合体と残存モノマーとを含む第1の粘着シートに対して活性エネルギー線を用いた表面改質処理を実施することにより、前記第1の粘着シートに比べて前記残存モノマーの量を低減させた第2の粘着シートを得ることを含む、粘着シートの製造方法、
を提供する。
上記本発明の粘着シートの製造方法によって形成された前記第2の粘着シートの表面に光学フィルムを配置して粘着シート付き光学フィルムを形成することを含む、粘着シート付き光学フィルムの製造方法、
を提供する。
モノマーの重合体と残存モノマーとを含む第1の粘着シートに対して活性エネルギー線を用いた表面改質処理を実施することにより、前記第1の粘着シートに比べて前記残存モノマーの量を低減させた第2の粘着シートを得ることを含む。
第1から第12態様のいずれか1つの態様にかかる製造方法によって形成された前記第2の粘着シートの表面に光学フィルムを配置して粘着シート付き光学フィルムを形成することを含む。
図1を参照して、本発明の粘着シートの製造方法の一例を説明する。この例では、第1の粘着シート1に対して活性エネルギー線21を用いた表面改質処理を実施することにより、第2の粘着シート2を形成する。第1の粘着シート1は、モノマーの重合体と残存モノマーとを含む。残存モノマーは、典型的には、重合体を形成する重合反応における未反応モノマーである。第2の粘着シート2では、第1の粘着シート1に比べて、残存モノマーの量が低減されている。表面改質処理は、露出面である第1の粘着シート1の表面12に対して実際される。より具体的には、表面改質処理は、表面12に対する活性エネルギー線21の照射により実施される。ただし、活性エネルギー線21を用いる限り、表面改質処理の態様はこの例に限定されない。また、表面改質処理は、第1の粘着シート1の一方の表面12に対して実施されている。ただし、表面改質処理は、第1の粘着シート1の双方の表面12,13に対して実施してもよい。表面改質処理がなされた表面12は、改質処理面14となる。
第1の粘着シート1は、モノマー群及び/又は当該モノマー群の部分重合物を含む光硬化性組成物から形成された粘着シート(光硬化型の粘着シート)であってもよい。ただし、第1の粘着シート1は、モノマーの重合体と残存モノマーとを含む限り、上記例に限定されない。第1の粘着シート1は、モノマー群と溶剤とを含む熱硬化性組成物から形成された粘着シート(熱硬化型の粘着シート)であってもよい。なお、含まれる残存モノマーの量は、熱硬化型粘着シートに比べて光硬化型粘着シートで多い傾向にある。これには、大気中の酸素によって、特にシートの表面近傍における光硬化型組成物の硬化が阻害されやすいことが影響している可能性がある。このため、光硬化型の粘着シートでは、粘着シートの外部、典型的には隣接する層、に残存モノマーが移動して悪影響を及ぼしやすい。悪影響の一例は、隣接する光学フィルムにおけるクラックの発生である。この観点からは、第1の粘着シート1(及び当該粘着シートから形成された第2の粘着シート2)が光硬化型である場合に、本発明の製造方法は特に有利である。
はく離ライナー33の基材(以下、「ライナー基材」)の例は、樹脂フィルムである。ライナー基材に含まれうる樹脂の例は、ポリエチレンテレフタレート及びポリエチレンナフタレート等のポリエステル、アセテート樹脂、ポリエーテルスルホン、ポリカーボネート、ポリアミド、ポリイミド、ポリオレフィン、(メタ)アクリル樹脂、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリスチレン、ポリビニルアルコール、ポリアリレート、並びにポリフェニレンサルファイドである。樹脂は、好ましくは、ポリエチレンテレフタレート等のポリエステルである。
基材シート31の例は、樹脂フィルムである。基材シート31に含まれる樹脂の例は、ライナー基材に含まれうる樹脂の例と同じである。
光硬化性組成物は、光35の照射によって塗布層32から第1の粘着シート1が形成されうる組成物である。光硬化性組成物は、例えば、(メタ)アクリル系モノマーを含むモノマー群及び/又は当該モノマー群の部分重合物を含む。光硬化性組成物における(メタ)アクリル系成分、すなわち(メタ)アクリル系モノマー及びその部分重合物、の含有率は、50重量%以上、60重量%以上、70重量%以上、さらには80重量%以上であってもよい。この場合、(メタ)アクリル重合体及びその架橋物を主成分とするアクリル系の粘着シートを形成できる。ただし、光硬化性組成物は上記例に限定されない。本明細書において(メタ)アクリルとは、アクリル及びメタクリルを意味する。(メタ)アクリレートとは、アクリレート及びメタクリレートを意味する。
第1の積層体34は、例えば、基材シート31(又ははく離ライナー33)の上に塗布層32を形成し、形成した塗布層32の上にはく離ライナー33(又は基材シート31)を配置して形成できる。また、互いの主面が向き合うように所定の間隔に保持された基材シート31及びはく離ライナー33の間の空間に光硬化性組成物を流しこむように塗布して第1の積層体34を形成してもよい。
第1の積層体34に照射する光35は、例えば、波長450nmよりも短い波長を有する可視光又は紫外線である。光35は、光硬化性組成物が含む光重合開始剤の吸収波長と同じ領域の波長の光を含んでいてもよい。波長200nm以下、好ましくは波長300nm以下の短波長光をフィルター等でカットした光35を照射してもよく、短波長光をカットすることは、光35による基材シート31及び/又ははく離ライナー33の劣化の抑制に適している。光35の光源は、例えば紫外線照射ランプを備える光照射装置である。紫外線照射ランプの例は、紫外光LED、低圧水銀灯、中圧水銀灯、高圧水銀灯、超高圧水銀灯、メタルハライドランプ、キセノンランプ、マイクロウエーブ励起水銀灯、ブラックライトランプ、ケミカルランプ、殺菌ランプ、低圧放電水銀ランプ、エキシマレーザーである。2以上の紫外線照射ランプが組み合わされていてもよい。
第2の粘着シート2は、光硬化型であってもよい。
図5を参照して、本発明の粘着シート付き光学フィルムの製造方法の一例を説明する。この例では、基材シート11上に配置された第2の粘着シート2の改質処理面14に光学フィルム3を配置して、粘着シート付き光学フィルム51を形成する。粘着シート付き光学フィルム51は、基材シート11、第2の粘着シート2及び光学フィルム3をこの順で含む。粘着シート付き光学フィルム51は、そのまま又は基材シート11を剥離した後に、例えば、第2の粘着シート2と光学フィルム3とを備える光学積層体として画像表示装置等に使用できる。光学積層体は、第2の粘着シート2を介して対象物(例えば画像形成パネル)に貼り合わせてもよい。ただし、粘着シート付き光学フィルム51の用途は、上記例に限定されない。粘着シート付き光学フィルム51から基材シート11を剥離して形成された露出面37には、光学フィルム等のさらなる部材を配置してもよく、一例として、光学フィルム3A、第2の粘着シート2及び光学フィルム3Bをこの順で含む粘着シート付き光学フィルム52を形成できる(図6参照)。光学フィルム3A,3Bは、互いに同一であっても異なっていてもよい。
(合成例1)
n-ブチルアクリレート(BA)99重量部、及び4-ヒドロキシブチルアクリレート(HBA)1重量部と、光重合開始剤としてOmnirad184(1-ヒドロキシシクロヘキシル-フェニルケトン、IGM Resins製)を0.05重量部、Omnirad651(2,2-ジメトキシ-1,2-ジフェニルエタン-1-オン、IGM Resins製)を0.05重量部とを4つロフラスコに投入し、窒素雰囲気下で紫外線を照射することによって、部分的に光重合したモノマーシロップA1を得た。紫外線の照射は、フラスコ内の液体の粘度(計測条件:BH粘度計No.5ローター、10rpm、測定温度30℃)が約20Pa・sになるまで実施した。
使用するモノマーを表1のように変更したことを除き、モノマーシロップA1と同様にして、モノマーシロップA2を調製した。なお、表1中の「AA」は、アクリル酸である。
以下の表2に示す組成となるように、モノマーシロップ及び架橋剤を混合して、光硬化性組成物C1,C2を得た。なお、表2中の「NDDA」は、1,9-ノナンジオールジアクリレートである。
(製造例1:はく離ライナーAの作製)
付加反応硬化型シリコーン(ヘキセニル基含有ポリオルガノシロキサンを含むLTC761、30重量%トルエン溶液、東レ・ダウコーニング製)30重量部、剥離コントロール剤(未反応性シリコーン樹脂を含むBY24-856、東レ・ダウコーニング製)0.9重量部、及び硬化触媒(白金触媒を含むSRX212、東レ・ダウコーニング製)2重量部、及び希釈溶媒としてトルエン/ヘキサン混合溶媒(体積比1:1)を混合して、シリコーン系離型剤組成物を得た。離型剤組成物におけるシリコーン固形分の濃度は、1.0重量%であった。次に、ライナー基材(ポリエステルフィルムであるルミラーXD500P、厚さ75μm)の片面に離型剤組成物をワイヤーバーにより塗布し、130℃で1分間加熱して、離型層(厚さ60nm)を片面に備えるはく離ライナーAを作製した。
ライナー基材に対する離型剤組成物の塗布厚みを変更した以外は製造例1と同様にして、離型層(厚さ120nm)を片面に備えるはく離ライナーBを作製した。
光硬化性組成物C1を製造例1で作製したはく離ライナーA及び製造例2で作製したはく離ライナーBによって挟持するようにアプリケーターにより塗布して、はく離ライナーA、塗布層及びはく離ライナーBからなる第1の積層体を得た。はく離ライナーA,Bは、いずれも、離型層が塗布層に接するように使用した。次に、第1の積層体におけるはく離ライナーAの側から、照射強度2.5mW/cm2、照射時間640秒の条件で紫外線(Black light光源)を照射し、塗布層を光硬化させて、はく離ライナーA、第1の粘着シートA(厚さ20μm)及びはく離ライナーBにより構成される第2の積層体を形成した。形成した第1の粘着シートAにおける重合率は98.1%であった。形成した第1の粘着シートAにおける残存モノマーの量は、18230ppmであった。残存モノマーの量は、GC分析により評価した。以降の第1の粘着シート及び第2の粘着シートにおける残存モノマーの量も同様に評価した。GC分析に用いた装置及び測定条件を以下に示す。
・使用装置:GC7890A(Agilent Technologies製)
・カラム:HP-1(Agilent Technologies製)
・検出器:水素炎イオン化検出器(FID)
・注入口温度:250℃
・測定温度条件:以下の(1)から(4)を順に実施。(1)0℃で3分保持、(2)昇温速度10℃/分で昇温、(3)120℃に到達後、昇温速度20℃/分で昇温、(4)300℃で保持
・試料調整方法:試料(粘着シート)0.05gをスクリュー瓶に採取し、酢酸エチル2.5mLを加えて一晩振とうした。得られた溶液を0.45μmメンブレンフィルターで濾過後、濾過液1μLをGCに注入して分析した。
光硬化性組成物C1の代わりに光硬化性組成物C2を用いるとともに、紫外線の照射時間を480秒に変更した以外は、製造例2と同様にして、はく離ライナーA、第1の粘着シートB(厚さ20μm)及びはく離ライナーBにより構成される第2の積層体を形成した。形成した第1の粘着シートBの重合率は97.9%であった。また、第1の粘着シートBにおける残存モノマーの量は、19320ppmであった。
紫外線の照射時間を2000秒に変更した以外は製造例2と同様にして、はく離ライナーA、第1の粘着シートC(厚さ20μm)及びはく離ライナーBにより構成される第2の積層体を形成した。形成した第1の粘着シートCの重合率は97.7%であった。また、第1の粘着シートCにおける残存モノマーの量は、1500ppmであった。
(実施例1)
製造例3で作製した第2の積層体からはく離ライナーBを剥離し、第1の粘着シートAの片面を露出させた。次に、第1の粘着シートAの露出面に対して、酸素濃度0.1体積%の雰囲気(酸素-窒素混合雰囲気、1気圧)下、放電量14.6kJ/m2でコロナ処理を行って、第2の粘着シートを得た。得られた第2の粘着シートにおける残存モノマーの量は2990ppmであった。
以下の表3に示す第1の粘着シートに対して、表3に示す条件でコロナ処理を実施した以外は実施例1と同様にして、実施例2~9の第2の粘着シートを得た。なお、酸素濃度1.0体積%、0.1体積%及び0.01体積%の処理雰囲気は、酸素-窒素混合雰囲気とした。酸素濃度20.9体積%の処理雰囲気は、大気雰囲気とした。なお、処理雰囲気の圧力は全て1気圧であった。
製造例2で作製した第2の積層体からはく離ライナーBを剥離して得た第1の粘着シートAに対してコロナ処理を実施することなく、そのまま比較例1の粘着シートaとした。
製造例4で作製した第2の積層体からはく離ライナーBを剥離して得た第1の粘着シートCに対してコロナ処理を実施することなく、そのまま比較例2の粘着シートbとした。
製造例3で作製した第2の積層体からはく離ライナーBを剥離して得た第1の粘着シートBに対してコロナ処理を実施することなく、そのまま比較例3の粘着シートcとした。
実施例で作製した第2の粘着シートのコロナ処理面、及び比較例の粘着シートa~cの露出面に偏光フィルムD1を配置して、光学積層体を作製した。偏光フィルムD1は、変性メタクリル樹脂からなる透明保護フィルム側の表面が粘着シートに接するように配置した。次に、作製した光学積層体について、上述の方法によって、粘着シートと偏光フィルムとの投錨力を測定した。両面テープには、日東電工社製の商品名「No.531」を用いた。ステンレス製試験板には、SUS304の板(幅40mm×長さ120mm)を用いた。評価用シートには、ITOフィルム(125テトライトOES、尾池工業製)を用いた。引張試験機には、オートグラフSHIMAZU AG-I 10KN(島津製作所製)を用いた。
実施例で作製した第2の粘着シート及び比較例の各粘着シートに対する臭気の評価を以下のように実施した。
実施例で作製した第2の粘着シート及び比較例の各粘着シートの生産性を以下のように判定した。
A:残存モノマー量が10000ppm以下に達するのに要した時間Tが480秒以下である場合をAとした。
B:残存モノマー量が10000ppm以下に達するのに要した時間Tが480秒を超え960秒以下である場合をBとした。
C:残存モノマー量が10000ppm以下に達するのに要した時間Tが960秒を超える場合、又は残存モノマー量が10000ppmを超えている場合をCとした。
なお、時間Tは、コロナ処理を実施して得た第2の粘着シートについては当該処理によって残存モノマー量が10000ppm以下に達するまでに要した処理時間であり、コロナ処理を実施することなく得た比較例2の粘着シートについては、第1の積層体から第2の積層体を形成する際に残存モノマー量が10000ppm以下に達するのに要した紫外線の照射時間である。
Claims (16)
- モノマーの重合体と残存モノマーとを含む第1の粘着シートに対して活性エネルギー線を用いた表面改質処理を実施することにより、前記第1の粘着シートに比べて前記残存モノマーの量を低減させた第2の粘着シートを得ることを含む、粘着シートの製造方法。
- 前記第2の粘着シートにおける前記残存モノマーの量が5000ppm(重量基準)以下である、請求項1に記載の粘着シートの製造方法。
- 前記第1の粘着シートにおける前記残存モノマーの量が6000ppm(重量基準)以上である、請求項1に記載の粘着シートの製造方法。
- 前記表面改質処理が、コロナ処理、プラズマ処理、エキシマUV光処理及びフレーム処理からなる群から選択される少なくとも1つである、請求項1に記載の粘着シートの製造方法。
- 前記表面改質処理を、酸素濃度20体積%以下の雰囲気で実施する、請求項1に記載の粘着シートの製造方法。
- 前記雰囲気が不活性ガス雰囲気である、請求項5に記載の粘着シートの製造方法。
- 前記表面改質処理を前記第1の粘着シートの露出面に対して実施する、請求項1に記載の粘着シートの製造方法。
- 前記第1の粘着シートが、モノマー群及び/又は前記モノマー群の部分重合物を含む光硬化性組成物から形成された粘着シートである、請求項1に記載の粘着シートの製造方法。
- 前記モノマー群は(メタ)アクリル系モノマーを含む、請求項8に記載の粘着シート。
- 前記第1の粘着シートを、モノマー群及び/又は前記モノマー群の部分重合物を含む光硬化性組成物を含む塗布層に光を照射して形成することをさらに含む、請求項1に記載の粘着シートの製造方法。
- 前記第1の粘着シートを、基材シート、前記塗布層及びはく離ライナーをこの順に含む積層体に前記光を照射して形成する、請求項10に記載の粘着シートの製造方法。
- 前記光は、前記活性エネルギー線とは異なる、請求項10に記載の粘着シートの製造方法。
- 請求項1~12のいずれか1項に記載の製造方法によって形成された前記第2の粘着シートの表面に光学フィルムを配置して粘着シート付き光学フィルムを形成することを含む、粘着シート付き光学フィルムの製造方法。
- 前記表面は前記表面改質処理がなされた面である、請求項13に記載の粘着シート付き光学フィルムの製造方法。
- 前記光学フィルムが、偏光フィルム及び位相差フィルムからなる群から選ばれる少なくとも1つのフィルムを含む、請求項13に記載の粘着シート付き光学フィルムの製造方法。
- 前記光学フィルムに対する前記第2の粘着シートの投錨力が12N/25mm以上である前記粘着シート付き光学フィルムを形成する、請求項13に記載の粘着シート付き光学フィルムの製造方法。
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| PCT/JP2023/026819 Ceased WO2024019158A1 (ja) | 2022-07-22 | 2023-07-21 | 粘着シートの製造方法及び粘着シート付き光学フィルムの製造方法 |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2024014623A (ja) |
| KR (1) | KR20250041139A (ja) |
| CN (1) | CN119585387A (ja) |
| TW (1) | TW202413572A (ja) |
| WO (1) | WO2024019158A1 (ja) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0260981A (ja) * | 1988-08-29 | 1990-03-01 | Sekisui Chem Co Ltd | アクリル系粘着テープもしくはシートの製造方法 |
| JP2000026805A (ja) * | 1998-06-11 | 2000-01-25 | Minnesota Mining & Mfg Co <3M> | 感圧接着剤組成物およびその調製法 |
| JP2005514476A (ja) * | 2001-12-21 | 2005-05-19 | スリーエム イノベイティブ プロパティズ カンパニー | アクリルベース接着剤を製造するための多段照射方法 |
| JP2005132962A (ja) * | 2003-10-30 | 2005-05-26 | Soken Chem & Eng Co Ltd | (メタ)アクリル系重合体の製造方法 |
| JP2013241516A (ja) * | 2012-05-21 | 2013-12-05 | Showa Denko Packaging Co Ltd | 粘着シートの製造方法 |
| JP2014111715A (ja) * | 2012-10-31 | 2014-06-19 | Nitto Denko Corp | 紫外線硬化型アクリル系粘着剤層を有する粘着シートの製造方法 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4822034B1 (ja) | 1969-10-01 | 1973-07-03 |
-
2022
- 2022-07-22 JP JP2022117589A patent/JP2024014623A/ja active Pending
-
2023
- 2023-07-21 CN CN202380055799.1A patent/CN119585387A/zh active Pending
- 2023-07-21 KR KR1020257005375A patent/KR20250041139A/ko active Pending
- 2023-07-21 TW TW112127356A patent/TW202413572A/zh unknown
- 2023-07-21 WO PCT/JP2023/026819 patent/WO2024019158A1/ja not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0260981A (ja) * | 1988-08-29 | 1990-03-01 | Sekisui Chem Co Ltd | アクリル系粘着テープもしくはシートの製造方法 |
| JP2000026805A (ja) * | 1998-06-11 | 2000-01-25 | Minnesota Mining & Mfg Co <3M> | 感圧接着剤組成物およびその調製法 |
| JP2005514476A (ja) * | 2001-12-21 | 2005-05-19 | スリーエム イノベイティブ プロパティズ カンパニー | アクリルベース接着剤を製造するための多段照射方法 |
| JP2005132962A (ja) * | 2003-10-30 | 2005-05-26 | Soken Chem & Eng Co Ltd | (メタ)アクリル系重合体の製造方法 |
| JP2013241516A (ja) * | 2012-05-21 | 2013-12-05 | Showa Denko Packaging Co Ltd | 粘着シートの製造方法 |
| JP2014111715A (ja) * | 2012-10-31 | 2014-06-19 | Nitto Denko Corp | 紫外線硬化型アクリル系粘着剤層を有する粘着シートの製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2024014623A (ja) | 2024-02-01 |
| KR20250041139A (ko) | 2025-03-25 |
| CN119585387A (zh) | 2025-03-07 |
| TW202413572A (zh) | 2024-04-01 |
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