WO2024019153A1 - 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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- WO2024019153A1 WO2024019153A1 PCT/JP2023/026814 JP2023026814W WO2024019153A1 WO 2024019153 A1 WO2024019153 A1 WO 2024019153A1 JP 2023026814 W JP2023026814 W JP 2023026814W WO 2024019153 A1 WO2024019153 A1 WO 2024019153A1
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- Prior art keywords
- adhesive sheet
- release liner
- sensitive adhesive
- pressure
- coating layer
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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
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
-
- 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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
-
- 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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
-
- 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
-
- 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
- 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]
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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]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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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 for manufacturing an adhesive sheet and a method for manufacturing an optical film with an 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 obtained by curing a group of monomers including acrylic monomers, silicone monomers, etc. by polymerization and crosslinking.
- Patent Document 1 discloses a method in which a laminate including a base sheet, a coating layer containing a photocurable composition, and a release liner in this order is irradiated with light to form a pressure-sensitive adhesive sheet from the coating layer. In this method, since both main surfaces of the coating layer are covered with the base sheet and the release liner, inhibition of the photocuring reaction by oxygen can be suppressed.
- Forming a pressure-sensitive adhesive sheet by curing usually requires energy such as heat or light.
- energy such as heat or light.
- the energy required to form an adhesive sheet is lower than, for example, a method of thermally curing a coating layer containing an adhesive composition and a solvent in an oven (thermal curing method).
- the amount can be reduced.
- it is insufficient to focus only on the amount of energy required to cure the coating layer.
- the purpose of the present invention is to provide a technology suitable for manufacturing pressure-sensitive adhesive sheets with low environmental impact.
- the present invention In order to form a long laminate including a long base sheet, a long coating layer containing a photocurable composition, and a long release liner in this order, Laminating a release liner on the elongated coating layer while conveying it in the longitudinal direction; irradiating the laminate with light to form an adhesive sheet from the coating layer,
- the release liner has a peeling force of 1.0 N/50 mm or less with respect to the pressure-sensitive adhesive sheet measured after being exposed to the atmosphere in which the release liner is laminated to the coating layer for 24 hours, and Using a sheet whose peeling force with the adhesive sheet measured before implementation is 0.1 N/50 mm or less, Method for manufacturing 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 exposed surface of the 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.
- 1 is a cross-sectional view schematically showing an example of a release liner that can be used in the method for producing a pressure-sensitive adhesive sheet of the present 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.
- 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 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.
- 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: In order to form a long laminate including a long base sheet, a long coating layer containing a photocurable composition, and a long release liner in this order, Laminating a release liner on the elongated coating layer while conveying it in the longitudinal direction; irradiating the laminate with light to form an adhesive sheet from the coating layer,
- the release liner has a peeling force of 1.0 N/50 mm or less with respect to the pressure-sensitive adhesive sheet measured after being exposed to the atmosphere in which the release liner is laminated to the coating layer for 24 hours, and A sheet having a peeling force of 0.1 N/50 mm or less with respect to the pressure-sensitive adhesive sheet measured before the test is used.
- the method for manufacturing a pressure-sensitive adhesive sheet according to the first aspect includes: suspending the lamination of the release liner on the coating layer for 1 to 24 hours while the surface of the long release liner in contact with the coating layer is exposed to the atmosphere; The method further includes restarting lamination of the release liner to the coated layer after the interruption without removing the area including the surface exposed to the atmosphere from the release liner.
- the elongated release liner is unrolled from the rolled body and laminated on the coating layer.
- the photocurable composition contains a monomer group containing a (meth)acrylic monomer and/or a partial polymer of the monomer group.
- the (meth)acrylic monomer includes a carboxyl group-containing monomer.
- the method for producing an optical film with a pressure-sensitive adhesive sheet according to the sixth aspect of the present invention includes: The method includes arranging an optical film on the exposed surface of a pressure-sensitive adhesive sheet formed by the method for manufacturing a pressure-sensitive adhesive sheet according to any one of the first to fifth aspects to form an optical film with a pressure-sensitive adhesive sheet.
- the optical film includes at least one film selected from the group consisting of a polarizing film and a retardation film.
- release surface a release liner whose surface in contact with the coating layer (hereinafter referred to as "release surface") is exposed to the manufacturing atmosphere for a long time has an increased peel force against the pressure-sensitive adhesive sheet. For this reason, peeling defects that lead to deterioration in the quality of the pressure-sensitive adhesive sheet are likely to occur. It is presumed that the increase in peeling force is due to an increase in the functional groups and radicals on the peeling surface as they continue to be exposed to the manufacturing atmosphere.
- a release liner in which an increase in peel force due to exposure to a manufacturing atmosphere is suppressed is suitable for reducing the amount of waste not only of the release liner but also of the coating layer and base sheet laminated thereon.
- the peeling force PS 24 with respect to the adhesive sheet measured after being exposed for 24 hours is 1.0 N/50 mm or less
- the peeling force PS 0 with respect to the adhesive sheet measured before carrying out the above exposure is 0. It was confirmed that a release liner with a strength of .1 N/50 mm or less is suitable for avoiding the above-mentioned waste.
- an elongated coating layer 12 containing a photocurable composition is formed on one side of an elongated base sheet 11 fed out from a roll 31 using a coating device 32 .
- the coating layer 12 is formed while conveying the base sheet 11 in the longitudinal direction.
- the elongated release liner 13 unwound from the roll 33 is laminated on the coating layer 12 while being conveyed in the longitudinal direction.
- an elongated first laminate 10 including the base sheet 11, the coating layer 12, and the release liner 13 in this order is formed.
- the release surface 133 of the release liner 13 is exposed to the manufacturing atmosphere after the release liner 13 is unwound from the roll 33 and until it is laminated onto the coating layer 12.
- the first laminate 10 is irradiated with light 14 from the light irradiation device 34 to form the elongated adhesive sheet 1 from the coating layer 12 .
- the light 14 passes through the release liner 13, reaches the coating layer 12, and cures the coating layer 12.
- the light 14 may be irradiated from the base sheet 11 side, or from both sides of the release liner 13 and the base sheet 11.
- the formed adhesive sheet 1 is sandwiched between the base sheet 11 and the release liner 13 and constitutes a part of the second laminate 17 until the release liner 13 is peeled off.
- the third laminate 15 formed by peeling off the release liner 13 can be used, for example, for producing an optical film with an adhesive sheet or the like.
- the release liner 13 has a peel force PS 24 of 1.0 N/50 mm or less between the release liner 13 and the adhesive sheet 1, which was measured after being exposed to the atmosphere in which the release liner 13 is laminated to the coating layer 12 (hereinafter referred to as the "lamination atmosphere") for 24 hours.
- a sheet is used which has a peeling force PS 0 of 0.1 N/50 mm or less with respect to the pressure-sensitive adhesive sheet 1 measured before the above 24-hour exposure.
- the release force PS 24 of the release liner 13 is 0.8 N/50 mm or less, 0.5 N/50 mm or less, 0.4 N/50 mm or less, 0.3 N/50 mm or less, 0.2 N/50 mm or less, 0.15 N/50 mm. Below, it may be 0.1 N/50 mm or less, and further 0.08 N/50 mm or less.
- the lower limit of the peeling force PS 24 is, for example, 0.01 N/50 mm or more, 0.03 N/50 mm or more, and even 0.05 N/50 mm or more.
- the release force PS 0 of the release liner 13 may be 0.09 N/50 mm or less, 0.08 N/50 mm or less, 0.07 N/50 mm or less, 0.06 N/50 mm or less, or even 0.05 N/50 mm or less. good.
- the lower limit of the peeling force PS 0 is, for example, 0.01 N/50 mm or more, 0.02 N/50 mm or more, and even 0.03 N/50 mm or more.
- the release liner 13 has a ratio PS 24 /PS 0 of release force PS 24 to release force PS 0 of 10 or less, 8 or less, 6 or less, 5 or less, 4 or less, 3 or less, 2.5 or less, 2 or less, 1. It may be 7 or less, 1.5 or less, or even 1.4 or less.
- the lower limit of the ratio PS 24 /PS 0 is, for example, 1.01 or more, and may be 1.05 or more, 1.1 or more, 1.15 or more, 1.2 or more, or even 1.25 or more.
- the peeling force PS 24 is determined by cutting out the second laminate 17 formed using a release liner exposed to a lamination atmosphere for 24 hours to a width of 50 mm to prepare a test piece, and peeling off only the release liner 13 from the prepared test piece. Evaluation can be performed by conducting a 180° peel test.
- the peel force PS 0 can be evaluated in the same manner as the peel force PS 24 , except that the test piece is prepared from the second laminate 17 formed using the release liner before the 24-hour exposure described above.
- the peel test is carried out after approximately 0.5 to 1 hour has elapsed from the formation of the adhesive sheet 1. From the formation of the adhesive sheet 1 to the implementation of the peel test, the second laminate 17 and the test piece are placed in an air atmosphere at 23° C. ⁇ 5° C.
- the peeling speed of the peeling test is 300 mm/min, and the test temperature is 23°C ⁇ 5°C. If the width of the second laminate 17 is less than 50 mm, the measured value at the original width may be converted to a value per 50 mm width.
- the width direction of the base sheet 11 and release liner 13 can be the width direction of the test piece.
- Exposure of the release liner to measure the release force PS 24 involves placing the release liner in a state where the release surface is not exposed, typically in a rolled form, with the release surface in contact with the lamination atmosphere. , typically by unrolling the rolled body in a laminated atmosphere.
- the second laminate 17 is preferably formed within 1 hour, more preferably within 30 minutes after the end of exposure.
- the second laminate 17 for measuring the peel force PS 0 is formed by using a release liner in a state where the release surface is not exposed, typically in a rolled state, and in contact with the lamination atmosphere.
- the time from when the coating is applied until the coating layer 12 is laminated is limited to within 5 minutes.
- the release surface of the release liner is typically exposed to the lamination atmosphere for no more than 5 minutes. Production line stoppages due to problems or the like are usually resolved within about 1 to 24 hours.
- the lamination atmosphere is typically an atmospheric atmosphere.
- the atmospheric atmosphere may be a clean atmosphere in which foreign matter such as dust is removed by an air filter or the like.
- the clean atmosphere may be indicated by the cleanliness class defined in Japanese Industrial Standards (JIS) B9920, and may be class 8 or lower, class 7 or lower, class 6 or lower, or even class 5 or lower.
- JIS Japanese Industrial Standards
- the temperature of the lamination atmosphere is usually 23 ⁇ 10°C, and may be 23 ⁇ 5°C.
- the peeling forces PS 0 , PS 24 and the ratio PS 24 /PS 0 depend 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 peeling of the release liner 13. It may vary depending on the state of the surface and the composition, formation conditions, thickness, etc. of the release layer that the release liner 13 may include.
- the base material of the release liner 13 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 13 has excellent light 14 transmittance.
- the thickness of the release liner 13 is, for example, 10 to 200 ⁇ m, and may be 25 to 150 ⁇ m.
- the release liner 13 may include layers other than the liner base material.
- the release liner 13 may include a release layer.
- the release liner 13 in FIG. 2 includes a liner base material 131 and a release layer 132 formed on one surface of the liner base material 131. Release liner 13 of FIG. 2 can be used such that release layer 132 constitutes a release surface.
- the mold release layer 132 is typically a cured layer of a mold release agent composition containing a mold 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 13 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 acrylic 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 acrylic 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 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 132 can be formed, for example, by heating and drying a coating film containing a release agent composition formed on the liner base material 131.
- 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 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 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 thickness of the release layer 132 may be 110 nm or less; in other words, the release liner 13 may include the release layer 132 on the surface facing the coating layer 12, and the thickness of the release layer 132 may be 110 nm or less. There may be.
- Base sheet 11 An example of the base sheet 11 is a resin film. Examples of resins included in the base sheet 11 are the same as examples of resins that can be included in the liner base material.
- the base sheet 11 may have a light 14 transmittance, or may have a light 14 transmittance comparable to that of the release liner 13.
- the thickness of the base sheet 11 is, for example, 10 to 200 ⁇ m, and may be 25 to 150 ⁇ m.
- the base sheet 11 may include a release layer on the surface facing the coating layer 12.
- Examples of the release layer that the base sheet 11 can include and its manufacturing method are the same as the examples of the release layer that the release liner 13 can include and its manufacturing method.
- Both the release liner 13 and the base sheet 11 may be provided with 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 11 may be thicker.
- a sheet can usually be selected that has a greater peeling force with the adhesive sheet 1 than the release liner 13.
- the photocurable composition is a composition from which the adhesive sheet 1 can be formed from the coating layer 12 by irradiation with the 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, is 50% by weight or more, 60% by weight or more, 70% by weight or more, and even The content may be 80% by weight or more, and in this case, an acrylic pressure-sensitive adhesive sheet 1 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, It may be 90% by weight or more, or even 95% by weight or more.
- 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 further may be 5% by weight or less.
- 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 rate of polymerization and curing of a carboxyl group-containing monomer by irradiation with light 14 is usually higher than that of a (meth)acrylic acid alkyl ester that does not contain a carboxyl group.
- the high speed means that while the elastic modulus of the pressure-sensitive adhesive sheet 1 can be increased and the dimensional stability against deformation force can be improved, the peeling force of the release liner against the pressure-sensitive adhesive sheet 1 tends to be large. Therefore, the use of the release liner 13 whose release forces PS 24 and PS 0 are below the above-mentioned predetermined values is particularly advantageous when the photocurable composition contains a carboxyl group-containing monomer.
- 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 1.
- hydroxy group-containing monomers examples include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, They are 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, and (4-hydroxymethylcyclohexyl)-methyl 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, 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, 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 partial polymer.
- the partial polymer may be either a homopolymer or a copolymer.
- the partial polymer can contribute to stable formation of the coating layer 12 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 a total of 100 parts by weight of the monomer group and its partial polymer. It may be a department.
- 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.
- the polyfunctional monomer is preferably a monomer having two or more C ⁇ C bonds in one molecule.
- crosslinking agents 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, ) acrylate, dipentaerythritol hexa(meth)acrylate, 1,2-ethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol diacrylate (NDDA), 1, Polyfunctional acrylates (ester compounds of polyhydric alcohol and (meth)acrylic acid, etc.) such as 12-dodecanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, and tetramethylolmethane tri(meth)acrylate; allyl (meth)acryl
- 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, per 100 parts by weight of the monomer group and its partial polymer.
- the amount may be 1 part by weight or less, or even 0.5 part by weight or less.
- 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 12.
- the first laminate 10 is constructed by forming an elongated coating layer 12 on an elongated base sheet 11, and then forming an elongated peeling layer on the formed coating layer 12. It is formed by arranging the liner 13.
- the method for forming the first laminate 10 is not limited to this example as long as the first laminate 10 is formed.
- the first laminate 10 is produced by forming an elongated coating layer 12 on an elongated release liner 13 and then disposing an elongated base material sheet 11 on the formed coating layer 12. may be formed. Further, the photocurable composition is applied by pouring into the space between the elongated base sheet 11 and the elongated release liner 13 which are held at a predetermined interval so that their main surfaces face each other. A first laminate 10 may also be formed. In these methods as well, the elongated release liner 13 is laminated on the elongated coating layer 12 while being conveyed in the longitudinal direction.
- Formation of the elongated coating layer 12 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, and lip coating.
- Various coating methods such as , die coating, etc. can be applied.
- the coating device 32 may be a device that can implement these coating methods.
- the thickness of the coating layer 12 can be adjusted depending on the desired thickness of the adhesive sheet 1, and may be, for example, 5 to 100 ⁇ m, 5 to 50 ⁇ m, 5 to 25 ⁇ m, or even 5 to 20 ⁇ m.
- the elongated release liner 13 is unwound from the rolled body 33 and used to form the elongated first laminate 10.
- the elongated release liner 13 is unwound from the rolled body 33 and laminated onto the elongated coating layer 12 .
- the elongated base material sheet 11 is unwound from the rolled body 31 and used to form the elongated first laminate 10 .
- the manufacturing method of the present invention includes laminating the release liner 13 onto the coating layer 12 while the surface of the long release liner 13 in contact with the coating layer 12 is exposed to the lamination atmosphere. and restarting the lamination of the release liner 13 onto the coated layer 12 without removing the area including the surface exposed to the lamination atmosphere from the release liner 13 after the interruption. , may further include.
- the length of the first laminate 10 to be formed may be 1000 m or more, 2000 m or more, or even 3000 m or more.
- a base sheet 11 and a release liner 13 having a corresponding length or longer can be used.
- the first laminate 10 may include further layers other than the base sheet 11, the coating layer 12, and the release liner 13.
- the further layer may be arranged on the side of the base sheet 11 and/or the release liner 13 opposite to the side of the coating layer 12.
- the coating layer 12 is preferably in contact with the base sheet 11 and the release liner 13.
- the light 14 irradiated onto the first laminate 10 is, for example, visible light or ultraviolet light having a wavelength shorter than 450 nm.
- the light 14 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 14 may be irradiated by cutting short wavelength light of 300 nm or less with a filter or the like, and cutting off the short wavelength light is suitable for suppressing deterioration of the release liner 13 due to the light 14.
- the light source of the light 14 is a light irradiation device 34 including, for example, 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 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 to the first laminate 10 is, for example, 100 to 5000 mJ/cm 2 .
- the peeling force of the release liner 13 to the adhesive sheet 1 may be smaller than the peeling force of the base sheet 11 to the adhesive sheet 1.
- the peeling force of the base sheet 11 to the adhesive sheet 1 is, for example, 0.1 to 10 N/50 mm, and may be 1 to 8 N/50 mm, 2 to 7 N/50 mm, or even 3 to 5 N/50 mm.
- the length of the second laminate 17 to be formed may be 1000 m or more, 2000 m or more, or even 3000 m or more.
- the second laminate 17 can be distributed, for example, in the form of a roll or in the form of sheets.
- the polymerization rate of the monomer group in the adhesive sheet 1 is preferably 90% or more.
- the polymerization rate may be 95% or more, 98% or more, or even 99% or more.
- the gel fraction of the adhesive sheet 1 is, for example, 50% or more, and may be 75% or more, 80% or more, or even 85% or more.
- the thickness of the adhesive sheet 1 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 length of the adhesive sheet 1 to be formed may be 1000 m or more, 2000 m or more, or even 3000 m or more.
- the adhesive sheet 1 can be distributed, for example, in the form of a second laminate 17 or an optical film with an adhesive sheet.
- the adhesive sheet 1 can be used, for example, in an optical laminate including an optical film.
- the adhesive sheet 1 may be used for optical laminates.
- the optical laminate may be an optical film with an adhesive sheet.
- the use of the adhesive sheet 1 is not limited to the above example.
- the present invention provides a release liner used in the method for producing a pressure-sensitive adhesive sheet of the present invention.
- Examples of the release liner are the same as those described above in the description of the method for producing the pressure-sensitive adhesive sheet.
- An example of the method for manufacturing the optical film with adhesive sheet of the present invention will be described with reference to FIG. 3.
- an optical film 2 is attached to the exposed surface 18 of the adhesive sheet 1, which is formed by peeling the release liner 13 from the second laminate 17 that includes the base sheet 11, the adhesive sheet 1, and the release liner 13 in this order.
- Optical film with adhesive sheet 21 includes base sheet 11, adhesive sheet 1, and optical film 2 in this order.
- the second laminate 17 can be formed by the method for manufacturing the pressure-sensitive adhesive sheet 1 described above.
- the second laminate 17 may be elongated or sheet-like.
- the adhesive sheet-attached optical film 21 can be used as it is or after peeling off the base sheet 11, for example, as an optical laminate including the adhesive sheet 1 and the optical film 2 in an image display device or the like.
- the optical laminate may be attached to an object (for example, an image forming panel) via the adhesive sheet 1.
- the use of the adhesive sheet-attached optical film 21 is not limited to the above example.
- Further members such as an optical film may be arranged on the exposed surface 18 formed by peeling the base sheet 11 from the optical film 21 with an adhesive sheet.
- the optical film 2A, the adhesive sheet 1, and the optical film An optical film 22 with an adhesive sheet containing 2B in this order can be formed (see FIG. 4).
- the optical films 2A and 2B may be the same or different from each other.
- the optical film 2 may be placed on the exposed surface 18 directly or indirectly. In other words, the optical film 2 may be placed in contact with the exposed surface 18, or may be placed with another layer sandwiched between it and the exposed surface 18.
- FIG. 5 Another example of the method for manufacturing the optical film with adhesive sheet of the present invention will be described with reference to FIG. 5.
- the elongated optical film 2 is arranged on the exposed surface 18 of the adhesive sheet 1 in the elongated third laminate 15 formed by the method shown in FIG.
- An optical film 21 is formed.
- the optical film 2 is unwound from the roll 36 and placed on the exposed surface 18.
- the formation of the adhesive sheet 1 and the formation of the adhesive sheet-attached optical film 21 may be performed continuously.
- the method shown in FIG. 5 is particularly suitable for mass production of the optical film 21 with adhesive sheet.
- the optical film 2 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 2 may be a laminated film including a polarizing film and/or a retardation film.
- the optical film 2 may include a glass film.
- the optical film 2 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 attached to one main surface of a polarizer via an adhesive
- a protective film made of a thermosetting resin or an 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.
- An image display device may be formed using the optical film with a pressure-sensitive adhesive sheet formed by the above manufacturing method.
- the image display device can be formed by, for example, joining optical films 21 and 22 with adhesive sheets and an image display panel. The bonding may be performed using the adhesive sheet 1.
- 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.
- the image display device can be used for household appliances, in-vehicle applications, public information displays (PID), and the like.
- NDDA 1,9-nonanediol diacrylate
- mold release agent composition A was applied to one side of a long liner base material (Lumirror 38R75, a polyester film, thickness 38 ⁇ m) using a wire bar, and heated at 130°C for 1 minute to form a mold release layer.
- a long release liner A having a thickness of 60 nm on one side was produced.
- the produced release liner A was kept in a rolled form until it was evaluated for release force so that the surface on the side of the release layer used as the release surface was not exposed.
- Production of release liner B A long release liner B having a release layer (thickness 120 nm) on one side was produced in the same manner as Production Example 2 except that the thickness of the release agent composition A applied to the liner base material was changed. . The produced release liner B was kept in a rolled state until it was subjected to peel force evaluation so that the surface on the side of the release layer used as a release surface was not exposed.
- mold release agent composition C was applied to one side of a long liner base material (Lumirror 38R75, a polyester film, thickness 38 ⁇ m) using a wire bar, and heated at 130°C for 1 minute to form a mold release layer.
- a long release liner C having a thickness of 100 nm on one side was produced.
- the produced release liner C was kept in a rolled form until it was evaluated for release force so that the surface on the side of the release layer used as a release surface was not exposed.
- mold release agent composition D was applied to one side of a long liner base material (Lumirror 38R75, a polyester film, thickness 38 ⁇ m) using a wire bar, and heated at 130°C for 1 minute to form a mold release layer.
- a long release liner D having a thickness of 100 nm on one side was produced.
- the produced release liner D was kept in a rolled form until it was evaluated for release force so that the surface on the side of the release layer used as a release surface was not exposed.
- each release liner there is one that has just been unwound from the roll (for evaluation of peeling force PS 0 ), and one that has just been unwound from the roll, and one that has been unwound from the roll and placed in an atmosphere at 23°C with the surface on the release layer side exposed. Those exposed for 24 hours (for evaluation of peeling force PS 24 ) were used.
- ultraviolet rays black light source
- an illuminance of 2.4 mW/cm 2 and an integrated light amount of 2880 mJ/cm 2 to photocure the coating layer
- a second laminate consisting of a base sheet, an adhesive sheet (thickness: 20 ⁇ m), and a release liner was formed.
- the second laminate for evaluating the release force PS 0 after the release liner was unwound from the roll, the surface on the release layer side was exposed to the atmosphere for less than 5 minutes before being placed on the coating layer. Met.
- a second laminate for evaluating the peel force PS 24 was formed within 30 minutes after exposure of the release liner to the atmospheric atmosphere had ended.
- test piece having a length of 220 mm and a width of 50 mm was cut out from the formed second laminate.
- the test piece was subjected to a 180° peel test in which only the release liner was peeled off in the length direction using a tensile testing machine, and the peel forces PS 0 and PS 24 were evaluated.
- the conditions for the peel test were as described above.
- 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
長尺状の基材シート、光硬化性組成物を含む長尺状の塗布層、及び長尺状のはく離ライナーをこの順に含む長尺状の積層体を形成するために、前記長尺状のはく離ライナーを長手方向に搬送しながら前記長尺状の塗布層に積層することと、
前記積層体に光を照射して前記塗布層から粘着シートを形成することと、を含み、
前記はく離ライナーとして、前記はく離ライナーを前記塗布層に積層する雰囲気に24時間曝露した状態で測定した前記粘着シートとの剥離力が1.0N/50mm以下であり、かつ、前記24時間の曝露を実施する前に測定した前記粘着シートとの剥離力が0.1N/50mm以下であるシートを用いる、
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粘着シートの露出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。
長尺状の基材シート、光硬化性組成物を含む長尺状の塗布層、及び長尺状のはく離ライナーをこの順に含む長尺状の積層体を形成するために、前記長尺状のはく離ライナーを長手方向に搬送しながら前記長尺状の塗布層に積層することと、
前記積層体に光を照射して前記塗布層から粘着シートを形成することと、を含み、
前記はく離ライナーとして、前記はく離ライナーを前記塗布層に積層する雰囲気に24時間曝露した状態で測定した前記粘着シートとの剥離力が1.0N/50mm以下であり、かつ、前記24時間の曝露を実施する前に測定した前記粘着シートとの剥離力が0.1N/50mm以下であるシートを用いる。
前記長尺状のはく離ライナーにおける前記長尺状の塗布層に接する面が前記雰囲気に暴露された状態で、前記はく離ライナーの前記塗布層への積層を1~24時間中断することと、
前記中断の後、前記雰囲気に暴露された前記面を含む部位を前記はく離ライナーから除去することなく、前記はく離ライナーの前記塗布層への積層を再開することと、をさらに含む。
前記長尺状のはく離ライナーは、巻回体の状態から繰り出されて前記塗布層に積層される。
前記光硬化性組成物が(メタ)アクリル系単量体を含む単量体群及び/又は前記単量体群の部分重合物を含む。
前記(メタ)アクリル系単量体がカルボキシル基含有単量体を含む。
第1から第5態様のいずれか1つの態様にかかる粘着シートの製造方法によって形成された粘着シートの露出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。
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。
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、巻回体31から繰り出した長尺状の基材シート11の片面に対して、塗布装置32により、光硬化性組成物を含む長尺状の塗布層12を形成する。塗布層12は、基材シート11を長手方向に搬送しながら形成される。次に、巻回体33から繰り出した長尺状のはく離ライナー13を長手方向に搬送しながら塗布層12に積層する。これにより、基材シート11、塗布層12及びはく離ライナー13をこの順に含む長尺状の第1の積層体10が形成される。はく離ライナー13の剥離面133は、はく離ライナー13が巻回体33から繰り出された後、塗布層12に積層されるまでの間、製造雰囲気に曝露される。次に、光照射装置34からの光14を第1の積層体10に照射して、長尺状の粘着シート1を塗布層12から形成する。光14は、はく離ライナー13を透過して塗布層12に到達し、塗布層12を硬化させる。ただし、光14の照射は、基材シート11の側から実施してもよいし、はく離ライナー13及び基材シート11の双方の側から実施してもよい。形成された粘着シート1は、はく離ライナー13が剥離されるまでは、基材シート11及びはく離ライナー13によって挟持されて第2の積層体17の一部を構成している。はく離ライナー13を剥離して形成された第3の積層体15は、例えば、粘着シート付き光学フィルム又はその製造に使用できる。
はく離ライナー13には、はく離ライナー13を塗布層12に積層する雰囲気(以下、「積層雰囲気」)に24時間曝露した状態で測定した粘着シート1との剥離力PS24が1.0N/50mm以下であり、かつ、上記24時間の曝露を実施する前に測定した粘着シート1との剥離力PS0が0.1N/50mm以下であるシートを用いる。
基材シート11の例は、樹脂フィルムである。基材シート11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14の照射によって塗布層12から粘着シート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)アクリル系単量体を含む単量体群及び/又は当該単量体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)アクリル系単量体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%以上であってもよく、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1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ルレートを意味する。
図1の例では、第1の積層体10は、長尺状の基材シート11の上に長尺状の塗布層12を形成した後、形成した塗布層12の上に長尺状のはく離ライナー13を配置して形成される。長尺状の基材シート11、長尺状の塗布層12及び長尺状のはく離ライナー13をこの順に含み、塗布層12に剥離ライナー13が積層されている長尺状の第1の積層体10が形成される限り、第1の積層体10の形成方法はこの例に限定されない。第1の積層体10は、長尺状のはく離ライナー13の上に長尺状の塗布層12を形成した後、形成した塗布層12の上に長尺状の基材シート11を配置して形成してもよい。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長尺状の基材シート11及び長尺状のはく離ライナー13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10を形成してもよい。これらの方法においても、長尺状のはく離ライナー13は長手方向に搬送されながら長尺状の塗布層12に積層されることになる。
第1の積層体10に照射する光14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14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300nm以下の短波長光をフィルター等でカットした光14を照射してもよく、短波長光をカットすることは、光14によるはく離ライナー13の劣化の抑制に適している。光14の光源は、例えば紫外線照射ランプを備える光照射装置34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。
光14の照射を経て形成された第2の積層体17において、粘着シート1に対するはく離ライナー13の剥離力は、粘着シート1に対する基材シート11の剥離力に比べて小さくてもよい。粘着シート1に対する基材シート11の剥離力は、例えば0.1~10N/50mmであり、1~8N/50mm、2~7N/50mm、さらには3~5N/50mmであってもよい。
粘着シート1における単量体群の重合率は、好ましくは90%以上である。重合率は、95%以上、98%以上、さらには99%以上であってもよい。
上記とは異なる側面によれば、本発明は、上記本発明の粘着シートの製造方法に用いるはく離ライナーを提供する。当該はく離ライナーの例は、粘着シートの製造方法の説明において上述した例と同じである。
図3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、粘着シート1及びはく離ライナー13をこの順で含む第2の積層体17からはく離ライナー13を剥離することで形成された粘着シート1の露出面18に光学フィルム2を配置して、粘着シート付き光学フィルム21を形成する。粘着シート付き光学フィルム21は、基材シート11、粘着シート1及び光学フィルム2をこの順で含む。第2の積層体17は、上記粘着シート1の製造方法により形成できる。第2の積層体17は長尺状であっても枚葉状であってもよい。粘着シート付き光学フィルム21は、そのまま又は基材シート11を剥離した後に、例えば、粘着シート1と光学フィルム2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、粘着シート1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21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21から基材シート11を剥離して形成された露出面18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2A、粘着シート1及び光学フィルム2Bをこの順で含む粘着シート付き光学フィルム22を形成できる(図4参照)。光学フィルム2A,2Bは、互いに同一であっても異なっていてもよい。
n-ブチルアクリレート(BA)100重量部、アクリル酸(AA)5重量部、及び2-ヒドロキシエチルアクリレート(2HEA)0.1重量部と、光重合開始剤としてOmnirad184及びOmnirad651(いずれもIGM Resins製)を各々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を得た。紫外線の照射は、フラスコ内の溶液の粘度(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。次に、モノマーシロップ100重量部に対して架橋剤として1,9-ノナンジオールジアクリレート(NDDA)0.1重量部を均一に混合し、光硬化性組成物を得た。
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)100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BY24-850、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Aを得た。離型剤組成物A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、長尺状のライナー基材(ポリエステルフィルムであるルミラー38R75、厚さ38μm)の片面に離型剤組成物A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)を片面に備える長尺状のはく離ライナーAを作製した。作製したはく離ライナーAは、剥離面として用いる離型層側の面が露出しないように、剥離力の評価に供するまでは巻回体の状態とした。
ライナー基材に塗布する離型剤組成物Aの厚さを変更した以外は製造例2と同様にして、離型層(厚さ120nm)を片面に備える長尺状のはく離ライナーBを作製した。作製したはく離ライナーBは、剥離面として用いる離型層側の面が露出しないように、剥離力の評価に供するまでは巻回体の状態とした。
付加反応硬化型シリコーン(ビニル基含有ポリオルガノシロキサンを含むKS-847T、30重量%トルエン溶液、信越化学製)33.3重量部、及び硬化触媒(白金触媒を含むCAT-PL-50T、信越化学製)1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Cを得た。離型剤組成物C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、長尺状のライナー基材(ポリエステルフィルムであるルミラー38R75、厚さ38μm)の片面に離型剤組成物C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100nm)を片面に備える長尺状のはく離ライナーCを作製した。作製したはく離ライナーCは、剥離面として用いる離型層側の面が露出しないように、剥離力の評価に供するまでは巻回体の状態とした。
付加反応硬化型シリコーン(ビニル基含有ポリオルガノシロキサンを含むKS-847H、30重量%トルエン溶液、信越化学製)66.6重量部、及び硬化触媒(白金触媒を含むCAT-PL-50T、信越化学製)0.2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Dを得た。離型剤組成物D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、長尺状のライナー基材(ポリエステルフィルムであるルミラー38R75、厚さ38μm)の片面に離型剤組成物D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100nm)を片面に備える長尺状のはく離ライナーDを作製した。作製したはく離ライナーDは、剥離面として用いる離型層側の面が露出しないように、剥離力の評価に供するまでは巻回体の状態とした。
長尺状の基材シート(離型層を有さないポリエステルフィルムであるルミラー38R75、厚さ38μm)の片面に製造例1の光硬化性組成物をアプリケーターにより塗布し、長尺状の塗布層を形成した。次に、形成した塗布層の上に製造例2~5の各はく離ライナーを配置して長尺状の第1の積層体を得た。はく離ライナーは、離型層が塗布層に接するように配置した。塗布層の形成及びはく離ライナーの配置は、23℃の大気雰囲気下で実施した。各はく離ライナーには、巻回体から繰り出した直後のもの(剥離力PS0評価用)と、巻回体から繰り出した後、離型層側の面が露出した状態で23℃の大気雰囲気に24時間曝露したもの(剥離力PS24評価用)とを用いた。次に、第1の積層体におけるはく離ライナーの側から、照度2.4mW/cm2及び積算光量2880mJ/cm2の条件で紫外線(ブラックライト光源)を照射し、塗布層を光硬化させて、基材シート、粘着シート(厚さ20μm)及びはく離ライナーにより構成される第2の積層体を形成した。剥離力PS0を評価するための第2の積層体について、はく離ライナーを巻回体から繰り出した後、塗布層に配置するまでに離型層側の面が大気に接した時間は5分以内であった。また、剥離力PS24を評価するための第2の積層体は、大気雰囲気へのはく離ライナーの曝露が終了してから30分以内に形成した。次に、形成した第2の積層体から長さ220mm及び幅50mmの試験片を切り出した。試験片に対して、引張試験機を用いてはく離ライナーのみを長さ方向に引きはがす180°引きはがし試験を実施して、剥離力PS0及びPS24を評価した。引きはがし試験の条件は上述のとおりとした。
Claims (7)
- 長尺状の基材シート、光硬化性組成物を含む長尺状の塗布層、及び長尺状のはく離ライナーをこの順に含む長尺状の積層体を形成するために、前記長尺状のはく離ライナーを長手方向に搬送しながら前記長尺状の塗布層に積層することと、
前記積層体に光を照射して前記塗布層から粘着シートを形成することと、を含み、
前記はく離ライナーとして、前記はく離ライナーを前記塗布層に積層する雰囲気に24時間曝露した状態で測定した前記粘着シートとの剥離力が1.0N/50mm以下であり、かつ、前記24時間の曝露を実施する前に測定した前記粘着シートとの剥離力が0.1N/50mm以下であるシートを用いる、
粘着シートの製造方法。 - 前記長尺状のはく離ライナーにおける前記長尺状の塗布層に接する面が前記雰囲気に暴露された状態で、前記はく離ライナーの前記塗布層への積層を1~24時間中断することと、
前記中断の後、前記雰囲気に暴露された前記面を含む部位を前記はく離ライナーから除去することなく、前記はく離ライナーの前記塗布層への積層を再開することと、をさらに含む、請求項1に記載の粘着シートの製造方法。 - 前記長尺状のはく離ライナーは、巻回体の状態から繰り出されて前記塗布層に積層される、請求項1に記載の粘着シートの製造方法。
- 前記光硬化性組成物が(メタ)アクリル系単量体を含む単量体群及び/又は前記単量体群の部分重合物を含む、請求項1に記載の粘着シートの製造方法。
- 前記(メタ)アクリル系単量体がカルボキシル基含有単量体を含む、請求項4に記載の粘着シートの製造方法。
- 請求項1~5のいずれか1項に記載の製造方法によって形成された粘着シートの露出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6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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| JP2000086984A (ja) * | 1998-09-09 | 2000-03-28 | Nichiban Co Ltd | 粘着シートの製造方法 |
| JP2001089719A (ja) * | 1999-09-22 | 2001-04-03 | Sony Chem Corp | 粘着テープの製造方法及び製造装置 |
| JP2002121211A (ja) * | 2000-10-17 | 2002-04-23 | Sekisui Chem Co Ltd | 光重合性組成物の重合方法 |
| JP2015151473A (ja) * | 2014-02-14 | 2015-08-24 | 日東電工株式会社 | 光反応物層含有シート、及び、その製造方法 |
| JP2019137832A (ja) * | 2018-02-13 | 2019-08-22 | 日東電工株式会社 | 粘着シートおよび粘着シート積層体 |
| JP2021127353A (ja) * | 2020-02-10 | 2021-09-02 | 三星エスディアイ株式会社Samsung SDI Co., Ltd. | 光硬化型光学フィルム用粘着剤組成物、光硬化型光学フィルム用粘着剤層、光学部材、および画像表示装置 |
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| KR20250040998A (ko) | 2025-03-25 |
| TW202411381A (zh) | 2024-03-16 |
| JP2024014619A (ja) | 2024-02-01 |
| CN119585386A (zh) | 2025-03-07 |
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