WO2022172566A1 - 光学部材用粘着テープ - Google Patents

光学部材用粘着テープ Download PDF

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Publication number
WO2022172566A1
WO2022172566A1 PCT/JP2021/044888 JP2021044888W WO2022172566A1 WO 2022172566 A1 WO2022172566 A1 WO 2022172566A1 JP 2021044888 W JP2021044888 W JP 2021044888W WO 2022172566 A1 WO2022172566 A1 WO 2022172566A1
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WO
WIPO (PCT)
Prior art keywords
pressure
sensitive adhesive
meth
acrylate
adhesive tape
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Application number
PCT/JP2021/044888
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
実 矢木
総司 森永
誠剛 臼井
浩司 設樂
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to KR1020237026782A priority Critical patent/KR20230145065A/ko
Priority to CN202180093149.7A priority patent/CN116917430A/zh
Publication of WO2022172566A1 publication Critical patent/WO2022172566A1/ja

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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
    • C09J7/403—Adhesives in the form of films or foils characterised by release liners characterised by the structure of the release feature
    • 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
    • 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
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • 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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/203—Adhesives in the form of films or foils characterised by their carriers characterised by the structure of the release feature on the carrier layer
    • 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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • 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
    • 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
    • C09J7/405—Adhesives in the form of films or foils characterised by release liners characterised by the substrate of the release liner

Definitions

  • the present invention relates to an adhesive tape for optical members.
  • the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape for protecting optical members is made thinner, some of the two or more pressure-sensitive adhesive tapes for protecting optical members held by the holding tape may be removed when the release liner is peeled off. Detachment failure may occur, in which the liner is peeled off from the retaining tape in the form of sticking to the liner.
  • JP 2017-142375 Japanese Patent Application Laid-Open No. 2017-212038 JP 2017-219843 A
  • An object of the present invention is to provide a pressure-sensitive adhesive tape for optical members having a release liner, a pressure-sensitive adhesive tape for protecting an optical member, and a holding tape in this order, even if the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape for protecting the optical member is thin.
  • An object of the present invention is to provide an adhesive tape for an optical member, which can suppress abnormal peeling when peeled.
  • the pressure-sensitive adhesive tape for optical members is An adhesive tape (I) for protecting an optical member having an adhesive layer (1) on one surface of a base film (1); a holding tape (II) laminated directly on the outermost surface of the optical member protecting adhesive tape (I) opposite to the adhesive layer (1); a release liner (III) laminated directly on the exposed surface of the pressure-sensitive adhesive layer (1) of the pressure-sensitive adhesive tape (I) for protecting an optical member; has Two or more of the adhesive tapes for optical member protection (I) are laminated on one of the holding tapes (II) in an arrangement having gaps,
  • the pressure-sensitive adhesive layer (1) has a thickness of less than 25 ⁇ m, At least one of the corners formed on the opposing side surfaces of the two adhesive tapes (I) for optical member protection adjacent to each other across the gap is a chamfered portion.
  • the chamfered portion is a C surface, and the chamfered amount of the chamfered portion is C0.05 mm or more.
  • the chamfered portion is an R surface, and the chamfered amount of the chamfered portion is R0.05 mm or more.
  • the pressure-sensitive adhesive tape for optical members has a peeling force A when peeling the release liner (III) in an environment with a temperature of 23° C. and a humidity of 50% RH. It is smaller than the adhesive force B when peeling off.
  • the storage elastic modulus G' at 23°C of the adhesive constituting the adhesive layer (1) is 5.0 ⁇ 10 5 Pa or less.
  • the release liner is It is possible to provide a pressure-sensitive adhesive tape for optical members that can suppress abnormal peeling when peeled.
  • FIG. 4A is a schematic plan view showing some embodiments in which two or more pressure-sensitive adhesive tapes (I) for optical member protection are laminated in an arrangement with gaps in one holding tape (II).
  • FIG. 2 is a schematic plan view of one embodiment of the adhesive tape for optical members according to the embodiment of the present invention, viewed from the pressure-sensitive adhesive layer (1) side of the laminate after the release liner (III) has been peeled off.
  • FIG. 4 is a schematic perspective view showing several embodiments of corners and chamfers that can be formed on the side surface of the pressure-sensitive adhesive tape for optical member protection (I).
  • (meth)acrylic means at least one selected from the group consisting of acrylic and methacrylic
  • (meth)acrylate refers to at least one selected from the group consisting of acrylate and methacrylate
  • (meth)acryloyl means at least one selected from the group consisting of acryloyl and methacryloyl.
  • the pressure-sensitive adhesive tape for optical members comprises a pressure-sensitive adhesive tape (I) for protecting an optical member having a pressure-sensitive adhesive layer (1) on one surface of a substrate film (1), and the pressure-sensitive adhesive tape for protecting an optical member.
  • the holding tape (II) typically has the adhesive layer (2) on one side of the base film (2).
  • the pressure-sensitive adhesive tape for optical members typically includes the pressure-sensitive adhesive tape (I) for optical member protection, which has the pressure-sensitive adhesive layer (1) on one surface of the base film (1), A holding tape (II) having an adhesive layer (2) on one side of a substrate film (2) is attached to the outermost side of the optical member protecting adhesive tape (I) on the opposite side of the adhesive layer (1).
  • the outer surface and the pressure-sensitive adhesive layer (2) are directly laminated, and the release liner (III) is directly laminated on the exposed surface of the pressure-sensitive adhesive layer (1) of the optical member protecting pressure-sensitive adhesive tape (I).
  • Two or more of the optical member protecting adhesive tapes (I) are laminated on one of the holding tapes (II) with a gap therebetween.
  • the pressure-sensitive adhesive tape for optical members is as described above. (2), a laminate having the base film (2) in this order, wherein the lowest number of layers is 3 or more and the highest number of layers is 5 or more, the pressure-sensitive adhesive layer ( 1) and the base film (1) are components of the adhesive tape (I) for protecting optical members, and the pressure-sensitive adhesive layer (2) and the base film (2) are components of the holding tape (II).
  • the outermost surface of the pressure-sensitive adhesive tape (I) for protecting an optical member opposite to the pressure-sensitive adhesive layer (1) and the pressure-sensitive adhesive layer (2) are directly laminated, and the pressure-sensitive adhesive layer (1) is A release liner (III) is laminated directly on the exposed surface, and two or more of the adhesive tapes (I) for optical member protection are laminated on one holding tape (II) in a spaced arrangement.
  • each of the release liner (III), the pressure-sensitive adhesive layer (1), the base film (1), the pressure-sensitive adhesive layer (2), and the base film (2) is , may consist of only one layer, or may consist of two or more layers.
  • the pressure-sensitive adhesive tape for optical members may have any appropriate other layer within a range that does not impair the effects of the present invention. Only one kind of other layer may be used, or two or more kinds thereof may be used. The total number of other layers may be only one layer, or may be two or more layers. Other layers include, for example, an antistatic layer to be described later.
  • the number of laminations at the location where the number of laminations is the lowest in the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention is preferably 3 to 8 layers, more preferably 3 to 6 layers, depending on the number of other layers described above. , more preferably 3 to 5 layers, particularly preferably 3 to 4 layers, and most preferably 3 layers.
  • the number of layers of the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention where the number of layers is the highest is preferably 5 to 10 layers, more preferably 5 to 8 layers, depending on the number of other layers described above. , more preferably 5 to 7 layers, particularly preferably 5 to 6 layers, and most preferably 5 layers.
  • FIG. 1 One embodiment of the pressure-sensitive adhesive tape for optical members of the present invention is, as shown in FIG. 1) 12, an adhesive layer (2) 21, and a base film (2) 22 are directly laminated in this order, and the adhesive layer (1) 11 and the base film (1) 12 are adhesives for optical member protection.
  • the tape (I) 100 is composed, the adhesive layer (2) 21 and the base film (2) 22 constitute the holding tape (II) 200, and two or more optical members are attached to one holding tape (II) 200.
  • Protective adhesive tapes (I) two optical member protective adhesive tapes (I) 101 and 102 in the embodiment of FIG. 1) are laminated with a gap therebetween.
  • the shape of the holding tape (II) can be any suitable shape as long as it is a thick tape (also referred to as a sheet), as long as it does not impair the effects of the present invention.
  • a shape is typically a shape in which the longitudinal direction and the width direction, which are substantially perpendicular to each other, are the long sides and the short sides, respectively.
  • the shape of the pressure-sensitive adhesive tape for optical member protection (I) can be any appropriate shape as long as it is in the shape of a thick tape (also referred to as a sheet), as long as it does not impair the effects of the present invention.
  • any appropriate shape can be adopted according to the shape of the adherend.
  • Such a shape is typically a shape in which the longitudinal direction and the width direction, which are substantially perpendicular to each other, are the long sides and the short sides, respectively.
  • Two or more optical member protective adhesive tapes (I) included in the optical member adhesive tape of the present invention may have the same size, or at least two may have different sizes.
  • the distance L between two adjacent adhesive tapes (I) for protecting optical members with a gap therebetween is preferably 0.1 mm to 5.0 mm. more preferably 0.2 mm to 3.0 mm, still more preferably 0.3 mm to 2.0 mm, particularly preferably 0.5 mm to 1.5 mm, and most preferably 0.7 mm to 1.5 mm. 5 mm.
  • the number of pressure-sensitive adhesive tapes (I) for optical member protection laminated on one holding tape (II) in an arrangement having a gap may be two or three. There may be more than one.
  • At least two of the two or more optical member-protecting pressure-sensitive adhesive tapes (I) laminated on one holding tape (II) with a gap therebetween are Typically, they are arranged along the longitudinal direction of the retaining tape (II).
  • two pressure-sensitive adhesive tapes (I) for optical member protection are laminated on one holding tape (II) with a gap therebetween
  • one holding tape ( II) Two adhesive tapes (I) 101 and 102 for optical member protection are laminated on 200 with a gap along the longitudinal direction of the holding tape (II).
  • three adhesive tapes (I) for optical member protection are laminated on one holding tape (II) in an arrangement with gaps
  • three adhesive tapes for optical member protection (I ) 101, 102, and 103 may be arranged, for example, as shown in the schematic plan view of FIG. 2(b), or may be arranged as shown in the schematic plan view of FIG. .
  • the thickness of the pressure-sensitive adhesive layer (1) is thin, typically less than 30 ⁇ m, preferably less than 28 ⁇ m, more preferably less than 26 ⁇ m. It is preferably 21 ⁇ m or less, particularly preferably 16 ⁇ m or less.
  • the lower limit of the thickness of the adhesive layer (1) is preferably 5 ⁇ m or more, more preferably 8 ⁇ m or more, even more preferably 10 ⁇ m or more, and particularly preferably 12 ⁇ m or more. If the thickness of the pressure-sensitive adhesive layer (1) is within the above range, the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention can be applied to target members or targets while maintaining the adhesive performance required for the pressure-sensitive adhesive layer (1). It can correspond to thinning of the product.
  • the release liner (III), the pressure-sensitive adhesive layer (1), the base film (1), the pressure-sensitive adhesive layer (2), and the base film (2) are each , may have an antistatic layer on at least one surface thereof.
  • the adhesive tape for optical member protection (I) may have an antistatic layer on at least one surface thereof.
  • the holding tape (II) may have an antistatic layer on at least one surface thereof.
  • the adhesive layer (1) may contain a conductive component. Only one type of conductive component may be used, or two or more types may be used.
  • the pressure-sensitive adhesive layer (2) may contain a conductive component. Only one type of conductive component may be used, or two or more types may be used.
  • FIG. 3 is a schematic plan view of one embodiment of the adhesive layer (1) side of the laminate after the release liner (III) has been peeled off from the adhesive tape for optical members according to the embodiment of the present invention. is.
  • two adhesive tapes (I) 101 and 102 for optical member protection are laminated on one holding tape (II) 200 with a gap therebetween.
  • two optical member protecting adhesive tapes (I) 101 and 102 are adjacent to each other with a gap interposed therebetween, and the optical member protecting adhesive tape (I) 101 has corners 1a, 1b, 1c and 1d, and the adhesive tape (I) 102 for optical member protection has corners 2a, 2b, 2c and 2d on its side surfaces.
  • corners 1a, 1b, 2c, and 2d correspond to the corners formed on the opposing side surfaces of the two adhesive tapes (I) for optical member protection (I) 101 and 102. do. Therefore, in FIG. 3, at least one of the corners 1a, 1b, 2c, 2d formed on the opposing side surfaces of the two adhesive tapes (I) 101, 102 for optical member protection is a chamfered portion.
  • the thickness of the pressure-sensitive adhesive tape in the two or more pressure-sensitive adhesive tapes for protecting optical members held by the holding tape is reduced. Abnormal peeling is observed in which some are peeled off from the holding tape while sticking to the release liner, which poses a serious problem such as a decrease in yield.
  • at least one of the corners formed on the opposing side surfaces of two adjacent pressure-sensitive adhesive tapes (I) for optical member protection with a gap therebetween is a chamfered portion.
  • the two or more adhesive tapes (I) for optical member protection laminated in an arrangement having a gap on one holding tape (II) are satisfactorily formed into the holding tape (II ), it can be reliably peeled off at the interface between the release liner (III) and the adhesive tape for optical member protection (I). This is because at least one of the corners formed on the opposing side surfaces of the two adhesive tapes for optical member protection (I) adjacent to each other with a gap therebetween is a chamfered portion, so that the release liner (III) can be peeled off.
  • the force that separates the release liner (III) from the adhesive tape (I) for protecting the optical member and the force that separates the adhesive tape (I) for protecting the optical member from the holding tape (II) are , can act in an appropriate balance, and can suppress the occurrence of conventional peeling abnormalities.
  • the two adhesive tapes (I) 101 and 102 for optical member protection have a shape (rectangular shape) whose long sides and short sides are substantially perpendicular to each other in the longitudinal direction and the width direction, respectively.
  • Each side has four corners, but if the adhesive tape for optical member protection (I) does not have a rectangular shape as described above, the number of corners may be less than four or five or more. obtain.
  • the shape of the chamfered portion can take any suitable shape as long as it does not impair the effects of the present invention.
  • the chamfered portion is preferably at least one selected from the C-plane and the R-plane in that the effects of the present invention can be exhibited more effectively.
  • the amount of chamfering of the chamfered portion is preferably C0.05 mm or more, more preferably C0.05 mm to C5 mm, in terms of more expressing the effects of the present invention.
  • C0.1 mm to C1 mm is preferable, and C0.15 mm to C0.5 mm is particularly preferable.
  • the chamfered amount of the chamfered portion is preferably R0.05 mm or more, more preferably R0.05 mm to R5 mm, from the viewpoint that the effects of the present invention can be further expressed.
  • R0.1 to R1 mm is preferable, and R0.15 mm to R0.5 mm is particularly preferable.
  • FIG. 4 is a schematic perspective view showing several embodiments of corners and chamfers that can be formed on the side surface of the adhesive tape (I) for protecting optical members.
  • FIG. 4(a) shows an adhesive tape (I) 101 for optical member protection having four corners 1a, 1b, 1c, and 1d.
  • the adhesive tape (I) 101 for protecting optical members has a front surface 10, a back surface 20 and side surfaces 40, 50, 60 and 70, the side surface 40 and the side surface 50 forming a corner 1a, Side 50 and side 60 form corner 1b, side 60 and side 70 form corner 1c, and side 70 and side 40 form corner 1d. None of the four corners 1a, 1b, 1c, and 1d in FIG. 4(a) are chamfered.
  • FIG. 4(b) shows chamfered corners 1a and 1b of the adhesive tape (I) 101 for optical member protection shown in FIG. 4(a). , a corner 1c, and a corner 1d.
  • FIG. 4(c) shows the corners 1a and 1b of the adhesive tape (I) 101 for optical member protection shown in FIG. , a corner 1c, and a corner 1d.
  • the pressure-sensitive adhesive tape for an optical member preferably two or more optical member protection tapes laminated in the longitudinal direction of one holding tape (II) are used in order to further exhibit the effects of the present invention.
  • At least one of the corners formed on both longitudinal side surfaces of the pressure-sensitive adhesive tape (I) is a chamfered portion.
  • the corners formed on the side surfaces of both ends in the longitudinal direction are the corners 1c among the corners of the two adhesive tapes (I) 101 and 102 for optical member protection. , 1d, 2a, and 2b.
  • At least one of the corners formed on the side surfaces of both ends in the longitudinal direction among the side surfaces of the two or more optical member protecting adhesive tapes (I) laminated in the longitudinal direction of one holding tape (II) is chamfered.
  • the release liner (III) is peeled off, the release liner (III) is separated from the adhesive tape (I) for protecting the optical member, and the optical member is protected from the holding tape (II).
  • the force that separates the pressure-sensitive adhesive tape (I) can act in an appropriate balance, and the occurrence of conventional peeling problems can be further suppressed.
  • the peel force A when peeling the release liner (III) in an environment of temperature 23° C. and humidity 50% RH is preferably 0.15 N/25 mm or less. Yes, more preferably 0.001 N/25 mm to 0.10 N/25 mm, still more preferably 0.005 N/25 mm to 0.07 N/25 mm, particularly preferably 0.01 N/25 mm to 0.05 N/25 mm is.
  • the adhesive force B when peeling the holding tape (II) in an environment of temperature 23° C. and humidity 50% RH is preferably 1.00 N/25 mm or less. , More preferably 0.01 N / 25 mm to 0.50 N / 25 mm, still more preferably 0.02 N / 25 mm to 0.30 N / 25 mm, particularly preferably 0.02 N / 25 mm to 0.10 N / 25 mm be.
  • the adhesive strength B By adjusting the adhesive strength B within the above range, if it is below the upper limit, when peeling the release liner and peeling the holding tape from the adhesive tape for optical members attached to the adherend, the adherend If the lower limit is exceeded, it is possible to prevent accidental peeling due to transportation. Further, the details of the method for measuring the adhesive strength B will be described later.
  • the peeling force A is preferably smaller than the adhesive force B.
  • the peeling force A is preferably smaller than the adhesive force B.
  • the storage elastic modulus G′ at 23° C. of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (1) is preferably 5.0 ⁇ 10 5 Pa or less, More preferably 1.0 ⁇ 10 4 Pa to 3.0 ⁇ 10 5 Pa, still more preferably 1.0 ⁇ 10 4 Pa to 2.0 ⁇ 10 5 Pa, particularly preferably 1.0 ⁇ 10 4 Pa to 1.0 ⁇ 10 5 Pa. If the storage elastic modulus G' at 23°C of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (1) is within the above range, the effect of the present invention can be exhibited more effectively.
  • the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention preferably has a total light transmittance of 20% or more, more preferably 30% to 100%, still more preferably 50% to 100%, and particularly Preferably 83% to 100%, most preferably 85% to 100%. A method for measuring the total light transmittance will be described later.
  • the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention preferably has a haze of 20% or less, more preferably 0% to 20%, even more preferably 0% to 15%, and particularly preferably 0%. % to 12%, most preferably 0% to 10%. A method for measuring the haze will be described later.
  • the adhesive tape for optical members according to the embodiment of the present invention can be used for various purposes.
  • the adhesive tape for optical member according to the embodiment of the present invention is preferably for attachment to a foldable member or a rollable member, in that the effects of the present invention can be utilized more effectively.
  • a representative example of the foldable member or the rollable member is OLED.
  • the thickness of the release liner (III) is preferably from 1 ⁇ m to 300 ⁇ m, more preferably from 10 ⁇ m to 200 ⁇ m, still more preferably from 20 ⁇ m to 150 ⁇ m, and particularly from the point of view that the effects of the present invention can be exhibited more effectively. It is preferably between 35 ⁇ m and 100 ⁇ m, most preferably between 50 ⁇ m and 80 ⁇ m. If the thickness of the release liner (III) is too small compared to the above range, the effect of suppressing curling may be reduced. If the thickness of the release liner (III) is too large compared to the above range, the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention may easily float when bent.
  • the release liner (III) contains a resin base film (IIIa).
  • the resin base film (IIIa) examples include plastic films made of polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT); polyethylene (PE), polypropylene ( PP), polymethylpentene (PMP), ethylene-propylene copolymer, ethylene-vinyl acetate copolymer (EVA) and other ⁇ -olefin-based olefin-based resins as monomer components; polyvinyl chloride; Plastic film composed of (PVC); plastic film composed of vinyl acetate resin; plastic film composed of polycarbonate (PC); plastic film composed of polyphenylene sulfide (PPS); Plastic film composed of amide resin such as aromatic polyamide (aramid); plastic film composed of polyimide resin; plastic film composed of polyether ether ketone (PEEK); polyethylene (PE), polypropylene (PP ) and other olefinic resins; polytetrafluoroethylene, poly
  • the resin base film (IIIa) may have only one layer, or may have two or more layers.
  • the resin base film (IIIa) may be a stretched one.
  • the resin base film (IIIa) may be surface-treated.
  • surface treatment include corona treatment, plasma treatment, chromic acid treatment, ozone exposure, flame exposure, high voltage shock exposure, ionizing radiation treatment, and coating treatment with a primer.
  • the resin base film (IIIa) may contain any appropriate additive within a range that does not impair the effects of the present invention.
  • the release liner (III) may have a release layer (IIIb) in order to enhance the releasability from the pressure-sensitive adhesive layer (1).
  • the release liner (III) has a release layer (IIIb)
  • typically the release layer (IIIb) side is directly laminated to the adhesive layer (1).
  • any appropriate material can be adopted as the material for forming the release layer (IIIb) as long as the effects of the present invention are not impaired.
  • Examples of such forming materials include silicone-based release agents, fluorine-based release agents, long-chain alkyl-based release agents, fatty acid amide-based release agents, and the like. Among these, silicone release agents are preferred.
  • the release layer (IIIb) can be formed as a coating layer.
  • any appropriate thickness can be adopted according to the purpose within a range that does not impair the effects of the present invention.
  • Such a thickness is preferably 10 nm to 2000 nm, more preferably 10 nm to 1500 nm, still more preferably 10 nm to 1000 nm, and particularly preferably 10 nm to 500 nm.
  • the release layer (IIIb) may consist of only one layer, or may consist of two or more layers.
  • silicone-based release layers include addition-reactive silicone resins.
  • the addition reaction type silicone resin include, for example, KS-774, KS-775, KS-778, KS-779H, KS-847H, and KS-847T manufactured by Shin-Etsu Chemical; TPR- 6700, TPR-6710, TPR-6721; SD7220, SD7226 manufactured by Dow Corning Toray;
  • the coating amount (after drying) of the silicone release layer is preferably 0.01 g/m 2 to 2 g/m 2 , more preferably 0.01 g/m 2 to 1 g/m 2 , still more preferably 0.01 g/m 2 to 0.5 g/m 2 .
  • the release layer (IIIb) is formed, for example, by applying the above-described forming material on any appropriate layer by a conventionally known coating method such as reverse gravure coating, bar coating, and die coating. It can be cured by heat treatment at about 200°C. Moreover, you may combine heat processing and active-energy-ray irradiation, such as ultraviolet irradiation, as needed.
  • the release liner (III) may have an antistatic layer (IIIc).
  • any appropriate thickness can be adopted as the thickness of the antistatic layer (IIIc) as long as the effects of the present invention are not impaired.
  • Such a thickness is preferably 1 nm to 1000 nm, more preferably 5 nm to 900 nm, even more preferably 7.5 nm to 800 nm, and particularly preferably 10 nm to 700 nm.
  • the antistatic layer (IIIc) may consist of only one layer, or may consist of two or more layers.
  • any appropriate antistatic layer can be adopted as long as it is a layer capable of exhibiting an antistatic effect, as long as it does not impair the effects of the present invention.
  • Such an antistatic layer is preferably an antistatic layer formed by coating a conductive coating liquid containing a conductive polymer on any suitable substrate layer.
  • it is an antistatic layer formed by coating the resin substrate film (IIIa) with a conductive coating liquid containing a conductive polymer.
  • Specific coating methods include a roll coating method, a bar coating method, a gravure coating method, and the like.
  • any suitable conductive polymer can be adopted as the conductive polymer as long as it does not impair the effects of the present invention.
  • a conductive polymer include a conductive polymer obtained by doping a ⁇ -conjugated conductive polymer with a polyanion.
  • ⁇ -conjugated conductive polymers include linear conductive polymers such as polythiophene, polypyrrole, polyaniline, and polyacetylene.
  • Polyanions include polystyrene sulfonic acid, polyisoprene sulfonic acid, polyvinyl sulfonic acid, polyallylsulfonic acid, polyethyl acrylate sulfonic acid, polymethacrylic carboxylic acid, and the like. Only one type of conductive polymer may be used, or two or more types may be used.
  • release liner (III) includes a resin base film (IIIa) and a release layer (IIIb) in this order.
  • this embodiment consists of a resin substrate film (IIIa) and a release layer (IIIb).
  • release liner (III) comprises a resin base film (IIIa), an antistatic layer (IIIc) and a release layer (IIIb) in this order.
  • this embodiment consists of a resin substrate film (IIIa), an antistatic layer (IIIc) and a release layer (IIIb).
  • release liner (III) comprises an antistatic layer (IIIc), a resin base film (IIIa), an antistatic layer (IIIc) and a release layer (IIIb) in this order.
  • this embodiment consists of an antistatic layer (IIIc), a resin substrate film (IIIa), an antistatic layer (IIIc) and a release layer (IIIb).
  • the pressure-sensitive adhesive layer (1) may consist of only one layer, or may consist of two or more layers.
  • the thickness of the pressure-sensitive adhesive layer (1) is typically less than 30 ⁇ m, preferably 28 ⁇ m or less, more preferably 26 ⁇ m or less, and still more preferably 21 ⁇ m, in order to further express the effects of the present invention. or less, and particularly preferably 16 ⁇ m or less.
  • the lower limit of the thickness of the adhesive layer (1) is preferably 5 ⁇ m or more, more preferably 8 ⁇ m or more, even more preferably 10 ⁇ m or more, and particularly preferably 12 ⁇ m or more. If the thickness of the pressure-sensitive adhesive layer (1) is within the above range, the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention can be applied to target members or targets while maintaining the adhesive performance required for the pressure-sensitive adhesive layer (1). It can correspond to thinning of the product.
  • the pressure-sensitive adhesive layer (1) is preferably at least one selected from the group consisting of acrylic pressure-sensitive adhesive (1), urethane-based pressure-sensitive adhesive (1), rubber-based pressure-sensitive adhesive (1), and silicone pressure-sensitive adhesive (1). Consists of seeds.
  • the pressure-sensitive adhesive layer (1) is more preferably an acrylic pressure-sensitive adhesive (1) in that the effects of the present invention can be exhibited more effectively.
  • the adhesive layer (1) can be formed by any appropriate method.
  • a pressure-sensitive adhesive composition that forms the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (1) (acrylic pressure-sensitive adhesive composition (1), urethane-based pressure-sensitive adhesive composition (1), rubber-based At least one selected from the group consisting of the pressure-sensitive adhesive composition (1) and the silicone-based pressure-sensitive adhesive composition (1)) is applied onto any appropriate substrate (for example, the substrate film (1)), and The adhesive layer is formed on the substrate by heating and drying according to the requirements and curing as necessary.
  • coating methods include gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, air knife coater, spray coater, comma coater, direct coater, roll brush coater, and the like. method.
  • the adhesive layer (1) may contain other components (1).
  • the other component (1) may be used alone or in combination of two or more.
  • any appropriate other component can be adopted as long as the effects of the present invention are not impaired.
  • Such other components (1) include, for example, other polymer components, cross-linking accelerators, cross-linking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), Antiaging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, UV absorbers, antioxidants, light stabilizers, chain transfer agents, plasticizers, softeners, Surfactants, conductive components, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts and the like.
  • a typical example of the other component (1) is a conductive component. Only one type of conductive component may be used, or two or more types may be used. As the conductive component, any suitable conductive component can be adopted as long as the effects of the present invention are not impaired. Examples of such conductive components include ionic liquids, ion-conducting polymers, ion-conducting fillers, and electrically-conducting polymers.
  • the adhesive layer (1) is preferably composed of an acrylic adhesive (1).
  • the acrylic pressure-sensitive adhesive (1) is formed from the acrylic pressure-sensitive adhesive composition (1).
  • the acrylic pressure-sensitive adhesive composition (1) contains a (meth)acrylic resin (1).
  • the (meth)acrylic resin (1) may be used alone or in combination of two or more.
  • the content of the (meth)acrylic resin (1) in the acrylic pressure-sensitive adhesive composition (1) is preferably 60% by weight to 99.9% by weight, more preferably 65% by weight, in terms of solid content. ⁇ 99.9% by weight, more preferably 70% to 99.9% by weight, particularly preferably 75% to 99.9% by weight, most preferably 80% to 99.9% by weight %.
  • Any suitable (meth)acrylic resin can be adopted as the (meth)acrylic resin (1) as long as the effects of the present invention are not impaired.
  • the weight-average molecular weight of the (meth)acrylic resin (1) is preferably 300,000 to 2,500,000, more preferably 350,000 to 2,000,000, and even more preferably, from the viewpoint that the effects of the present invention can be further expressed. is 400,000 to 1,800,000, particularly preferably 500,000 to 1,500,000.
  • the acrylic pressure-sensitive adhesive composition (1) may contain a cross-linking agent.
  • a cross-linking agent By using a cross-linking agent, the cohesive force of the acrylic pressure-sensitive adhesive (1) can be improved, and the effects of the present invention can be exhibited more.
  • the number of cross-linking agents may be one, or two or more.
  • cross-linking agents include polyfunctional isocyanate-based cross-linking agents, epoxy-based cross-linking agents, melamine-based cross-linking agents, peroxide-based cross-linking agents, urea-based cross-linking agents, metal alkoxide cross-linking agents, metal chelate-based cross-linking agents, and metal salts.
  • cross-linking agents carbodiimide-based cross-linking agents, oxazoline-based cross-linking agents, aziridine-based cross-linking agents, amine-based cross-linking agents, and the like.
  • at least one selected from the group consisting of a polyfunctional isocyanate-based cross-linking agent and an epoxy-based cross-linking agent is preferable in that the effect of the present invention can be exhibited more effectively.
  • polyfunctional isocyanate-based cross-linking agents include lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; cyclopentylene diisocyanate, cyclohexylene diisocyanate, Alicyclic polyisocyanates such as isophorone diisocyanate, hydrogenated tolylene diisocyanate and hydrogenated xylene diisocyanate; 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, xylylene diisocyanate and aromatic polyisocyanates.
  • lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate
  • cyclopentylene diisocyanate cyclohex
  • Polyfunctional isocyanate-based cross-linking agents include, for example, trimethylolpropane/tolylene diisocyanate adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate L”), trimethylolpropane/hexamethylene diisocyanate adduct (Nippon Polyurethane Industry Co., Ltd. company, trade name "Coronate HL”), trade name "Coronate HX” (Nippon Polyurethane Industry Co., Ltd.), trimethylolpropane/xylylene diisocyanate adduct (manufactured by Mitsui Chemicals, trade name "Takenate 110N”), etc. A commercial item is also mentioned.
  • epoxy-based cross-linking agents include N,N,N',N'-tetraglycidyl-m-xylenediamine, diglycidylaniline, 1,3-bis(N,N-diglycidylamino methyl)cyclohexane, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyglycidyl ether,
  • any appropriate content can be adopted for the content of the cross-linking agent in the acrylic pressure-sensitive adhesive composition (1) as long as the effects of the present invention are not impaired.
  • a content is, for example, preferably 30 parts by weight or less with respect to the solid content (100 parts by weight) of the (meth)acrylic resin (1) in terms of expressing the effects of the present invention more. , more preferably 0.05 to 20 parts by weight, still more preferably 0.1 to 18 parts by weight, particularly preferably 0.5 to 15 parts by weight, most preferably 0.5 to 10 parts by weight.
  • the acrylic pressure-sensitive adhesive composition (1) may contain any appropriate other component within a range that does not impair the effects of the present invention.
  • Such other components include, for example, polymer components other than the (meth)acrylic resin (1), cross-linking accelerators, cross-linking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenol, etc.), antioxidants, inorganic fillers, organic fillers, metal powders, coloring agents (pigments, dyes, etc.), foils, UV absorbers, antioxidants, light stabilizers, chain transfer agents, Plasticizers, softeners, surfactants, antistatic agents, conductive agents, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts and the like.
  • the alkyl group of the (a component) alkyl ester portion preferably has 1 to 12 carbon atoms in order to further express the effects of the present invention.
  • the alkyl ester portion of the (a component) preferably has 1 to 12 carbon atoms in the alkyl group ( A (meth)acrylic acid alkyl ester and a (meth)acrylic acid formed by polymerization from a composition (A) containing (meth)acrylic acid without a (meth)acrylic acid ester having an OH group as component (b)
  • Component a and (Component b) may each independently be one type or two or more types.
  • Examples of the (meth)acrylic acid alkyl ester (component a) in which the alkyl group of the alkyl ester moiety has 1 to 12 carbon atoms include methyl (meth)acrylate, ethyl (meth)acrylate, and (meth)acrylic acid.
  • n-propyl isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, (meth)acrylic acid Pentyl, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, (meth)acrylic Examples include isononyl acid, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, and dodecyl (meth)acrylate.
  • methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate are preferable in that the effects of the present invention can be expressed more. and more preferably methyl acrylate, ethyl acrylate, n-butyl acrylate and 2-ethylhexyl acrylate.
  • At least one (component b) selected from the group consisting of (meth)acrylic acid esters having an OH group and (meth)acrylic acid includes, for example, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, Examples thereof include (meth)acrylic acid esters having an OH group such as hydroxybutyl (meth)acrylate, and (meth)acrylic acid.
  • hydroxyethyl (meth)acrylate and (meth)acrylic acid are preferred, and hydroxyethyl acrylate and acrylic acid are more preferred, from the viewpoint that the effects of the present invention can be exhibited more.
  • the composition (A) may contain copolymerizable monomers other than the components (a) and (b).
  • the number of copolymerizable monomers may be one, or two or more.
  • Examples of such copolymerizable monomers include (meth)acrylic acid alkyl esters in which the alkyl group in the alkyl ester portion has 1 to 3 carbon atoms; itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, Carboxyl group-containing monomers (excluding (meth)acrylic acid) such as these acid anhydrides (e.g., acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride); (meth)acrylamide, N, N - amide group-containing monomers such as dimethyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methoxymethyl (meth)acrylamide, N-butoxymethyl (meth)acrylamide, N-hydroxye
  • a polyfunctional monomer can also be employed as a copolymerizable monomer.
  • a polyfunctional monomer refers to a monomer having two or more ethylenically unsaturated groups in one molecule.
  • any suitable ethylenically unsaturated group can be adopted as long as the effects of the present invention are not impaired.
  • Such ethylenically unsaturated groups include, for example, radically polymerizable functional groups such as vinyl groups, propenyl groups, isopropenyl groups, vinyl ether groups (vinyloxy groups), and allyl ether groups (allyloxy groups).
  • polyfunctional monomers examples include hexanediol di(meth)acrylate, butanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (poly)propylene glycol di(meth)acrylate, and neopentyl glycol.
  • (Meth)acrylic acid alkoxyalkyl esters may also be employed as copolymerizable monomers.
  • Examples of (meth)acrylic acid alkoxyalkyl esters include 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, and 3-(meth)acrylate. methoxypropyl, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, 4-ethoxybutyl (meth)acrylate and the like.
  • the (meth)acrylic acid alkoxyalkyl ester may be used alone or in combination of two or more.
  • the content of the (meth)acrylic acid alkyl ester (component a) in which the alkyl group in the alkyl ester portion has 1 to 12 carbon atoms is more effective in expressing the effects of the present invention, and is therefore the (meth)acrylic resin ( A) is preferably 30% by weight or more, more preferably 35% to 99% by weight, and still more preferably 40% to 98% by weight, relative to the total amount (100% by weight) of the monomer components constituting A). Yes, particularly preferably 50% to 95% by weight.
  • the content of the (meth)acrylic acid alkyl ester having 2 to 12 carbon atoms (preferably 2 to 10, more preferably 2 to 8, and still more preferably 2 to 6) in the alkyl group of is preferably 30% by weight. More preferably 35 wt % to 100 wt %, still more preferably 40 wt % to 100 wt %, and particularly preferably 45 wt % to 100 wt %.
  • the content of at least one (component b) selected from the group consisting of (meth)acrylic acid esters having an OH group and (meth)acrylic acid is such that the effects of the present invention can be more expressed, and the (meth)acrylic acid It is preferably 1% by weight or more, more preferably 1% to 30% by weight, still more preferably 2% to 20% by weight, based on the total amount (100% by weight) of the monomer components constituting the system resin (A). % by weight, particularly preferably 3 to 15% by weight.
  • composition (A) may contain any appropriate other component within a range that does not impair the effects of the present invention.
  • Such other components include, for example, polymerization initiators, chain transfer agents, solvents and the like. Any appropriate content can be adopted as the content of these other components as long as the effects of the present invention are not impaired.
  • a thermal polymerization initiator or a photopolymerization initiator can be used as the polymerization initiator. Only one polymerization initiator may be used, or two or more polymerization initiators may be used.
  • a thermal polymerization initiator can preferably be employed when the (meth)acrylic resin (A) is obtained by solution polymerization.
  • thermal polymerization initiators include azo polymerization initiators, peroxide polymerization initiators (eg, dibenzoyl peroxide, tert-butyl permaleate, etc.), redox polymerization initiators, and the like.
  • the azo initiators disclosed in JP-A-2002-69411 are particularly preferred.
  • Such an azo polymerization initiator is preferable in that the decomposition product of the polymerization initiator is less likely to remain in the (meth)acrylic resin (A) as a portion that causes gas generated by heating (outgas).
  • AIBN 2,2'-azobisisobutyronitrile
  • AMBN 2,2'-azobis-2-methylbutyronitrile
  • 2,2′-azobis(2-methylpropionate)dimethyl 4,4′-azobis-4-cyanovaleric acid, and the like.
  • a photopolymerization initiator can preferably be employed when the (meth)acrylic resin (A) is obtained by active energy ray polymerization.
  • photopolymerization initiators include benzoin ether-based photopolymerization initiators, acetophenone-based photopolymerization initiators, ⁇ -ketol-based photopolymerization initiators, aromatic sulfonyl chloride-based photopolymerization initiators, and photoactive oxime-based photopolymerization initiators.
  • benzoin-based photopolymerization initiators benzyl-based photopolymerization initiators, benzophenone-based photopolymerization initiators, ketal-based photopolymerization initiators, thioxanthone-based photopolymerization initiators, and the like.
  • benzoin ether-based photopolymerization initiators examples include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethan-1-one, and anisole. and methyl ether.
  • Acetophenone-based photopolymerization initiators include, for example, 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenylketone, 4-phenoxydichloroacetophenone, and 4-(t-butyl). and dichloroacetophenone.
  • Examples of ⁇ -ketol photopolymerization initiators include 2-methyl-2-hydroxypropiophenone, 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropan-1-one, and the like.
  • Examples of aromatic sulfonyl chloride photopolymerization initiators include 2-naphthalenesulfonyl chloride.
  • Examples of photoactive oxime-based photopolymerization initiators include 1-phenyl-1,1-propanedione-2-(o-ethoxycarbonyl)-oxime.
  • Benzoin-based photopolymerization initiators include, for example, benzoin.
  • Examples of benzyl-based photopolymerization initiators include benzyl.
  • benzophenone-based photopolymerization initiators examples include benzophenone, benzoylbenzoic acid, 3,3′-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, ⁇ -hydroxycyclohexylphenylketone, and the like.
  • ketal-based photopolymerization initiators examples include benzyl dimethyl ketal.
  • Thioxanthone-based photopolymerization initiators include, for example, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, and dodecylthioxanthone.
  • Preferred Embodiment 2 of the (meth)acrylic resin (1) preferably contains a (meth)acrylic acid ester having a cyclic structure in the molecule as a monomer component in order to further express the effects of the present invention.
  • the cyclic structure (ring) of the (meth)acrylic acid ester having a cyclic structure in the molecule is an aromatic ring or a non-aromatic ring may be either.
  • aromatic rings include aromatic carbocyclic rings (eg, monocyclic carbocyclic rings such as benzene ring, condensed carbocyclic rings such as naphthalene ring, etc.), various aromatic heterocyclic rings, and the like.
  • Non-aromatic rings include, for example, non-aromatic aliphatic rings (non-aromatic alicyclic rings) (e.g., cyclopentane rings, cyclohexane rings, cycloheptane rings, cycloalkane rings such as cyclooctane rings; Cycloalkene rings such as cyclohexene ring; etc.), non-aromatic bridging rings (e.g., bicyclic hydrocarbon rings such as pinane, pinene, bornane, norbornane, norbornene; tricyclic or higher aliphatic hydrocarbons such as adamantane rings (bridged hydrocarbon rings, etc.), non-aromatic heterocycles (eg, epoxy rings, oxolane rings, oxetane rings, etc.), and the like.
  • non-aromatic aliphatic rings non-aromatic aliphatic rings
  • non-aromatic alicyclic rings
  • Tricyclic or higher aliphatic hydrocarbon rings include, for example, a dicyclopentanyl group, a dicyclopentenyl group, an adamantyl group, a tricyclopentanyl group, and a tricyclopentenyl group. etc.
  • the ring-containing (meth)acrylate includes, for example, cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, cycloheptyl (meth)acrylate, and cyclooctyl (meth)acrylate.
  • Acid cycloalkyl ester (meth)acrylic acid ester having a bicyclic aliphatic hydrocarbon ring such as isobornyl (meth)acrylate; dicyclopentanyl (meth)acrylate, dicyclopentanyloxyethyl (meth)acrylate , Tricyclopentanyl (meth)acrylate, 1-adamantyl (meth)acrylate, 2-methyl-2-adamantyl (meth)acrylate, 2-ethyl-2-adamantyl (meth)acrylate, tricyclic or higher aliphatic carbonization (Meth)acrylic acid esters having a hydrogen ring; (meth)acrylic acid aryl esters such as phenyl (meth)acrylate, (meth)acrylic acid aryloxyalkyl esters such as phenoxyethyl (meth)acrylate, (meth)acryl (meth)acrylic acid esters having an aromatic ring, such as arylalkyl (meth
  • the ring-containing (meth)acrylic acid ester is preferably a non-aromatic ring-containing (meth)acrylic acid ester, more preferably cyclohexyl acrylate (CHA) or cyclohexyl methacrylate (CHMA).
  • a non-aromatic ring-containing (meth)acrylic acid ester more preferably cyclohexyl acrylate (CHA) or cyclohexyl methacrylate (CHMA).
  • DCPA dicyclopentanyl acrylate
  • DCPMA dicyclopentanyl methacrylate
  • DCPA dicyclopentanyl methacrylate
  • DCPA dicyclopentanyl methacrylate
  • DCPMA dicyclopentanyl methacrylate
  • the number of ring-containing (meth)acrylic acid esters may be one, or two or more.
  • the content of the ring-containing (meth)acrylic acid ester is preferably based on the total amount (100% by weight) of the monomer components constituting the (meth)acrylic resin (B) from the viewpoint that the effects of the present invention can be exhibited more. is 10 wt % or more, more preferably 20 wt % to 90 wt %, still more preferably 30 wt % to 80 wt %, particularly preferably 40 wt % to 70 wt %.
  • Examples of (meth)acrylic acid alkyl esters having a linear or branched alkyl group include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, and isopropyl (meth)acrylate.
  • the (meth)acrylic acid alkyl ester having a linear or branched alkyl group may be one type or two or more types.
  • the content of the (meth)acrylic acid alkyl ester having a straight-chain or branched-chain alkyl group is such that the effect of the present invention can be more expressed, and the total amount of the monomer components constituting the (meth)acrylic resin (B) is (100% by weight), preferably 10% by weight or more, more preferably 20% by weight to 90% by weight, still more preferably 25% by weight to 80% by weight, particularly preferably 30% by weight ⁇ 70% by weight, most preferably 30% to 60% by weight.
  • the composition (B) may contain a copolymerizable monomer other than the ring-containing (meth)acrylic acid ester and the (meth)acrylic acid alkyl ester having a linear or branched alkyl group.
  • the number of copolymerizable monomers may be one, or two or more. Examples of such copolymerizable monomers include 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, and 3-methoxy(meth)acrylate.
  • alkoxyalkyl (meth)acrylates such as propyl, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate and 4-ethoxybutyl (meth)acrylate; 2-hydroxy (meth)acrylate; Ethyl, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxy (meth)acrylate hydroxyl group (hydroxyl group)-containing monomers such as hexyl, vinyl alcohol and allyl alcohol; (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methoxymethyl (meth)acrylamide, N - Amide group-containing monomers such as butoxymethyl (meth)acrylamide and N-hydroxyethyl (meth)acrylamide; aminoethyl (meth)acrylate, di
  • a polyfunctional monomer can also be employed as a copolymerizable monomer.
  • a polyfunctional monomer refers to a monomer having two or more ethylenically unsaturated groups in one molecule.
  • any suitable ethylenically unsaturated group can be adopted as long as the effects of the present invention are not impaired.
  • Such ethylenically unsaturated groups include, for example, radically polymerizable functional groups such as vinyl groups, propenyl groups, isopropenyl groups, vinyl ether groups (vinyloxy groups), and allyl ether groups (allyloxy groups).
  • polyfunctional monomers examples include hexanediol di(meth)acrylate, butanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (poly)propylene glycol di(meth)acrylate, and neopentyl glycol.
  • composition (B) may contain any appropriate other component within a range that does not impair the effects of the present invention.
  • Such other components include, for example, polymerization initiators, chain transfer agents, solvents and the like. Any appropriate content can be adopted as the content of these other components as long as the effects of the present invention are not impaired.
  • a thermal polymerization initiator or a photopolymerization initiator can be used as the polymerization initiator. Only one polymerization initiator may be used, or two or more polymerization initiators may be used.
  • thermopolymerization initiator As a thermal polymerization initiator and a photopolymerization initiator (photoinitiator), [A-2-1-1. Preferred embodiment 1 of (meth)acrylic resin (1)] can be referred to.
  • any suitable urethane-based pressure-sensitive adhesive such as a known urethane-based pressure-sensitive adhesive described in JP-A-2017-039859 or the like is used within a range that does not impair the effects of the present invention. can be adopted.
  • Examples of such a urethane-based pressure-sensitive adhesive (1) include, for example, a urethane-based pressure-sensitive adhesive formed from a urethane-based pressure-sensitive adhesive composition, wherein the urethane-based pressure-sensitive adhesive composition comprises a urethane prepolymer and a polyol. and a cross-linking agent.
  • the urethane pressure-sensitive adhesive (1) may be of only one type, or may be of two or more types.
  • the urethane pressure-sensitive adhesive (1) may contain any appropriate component within a range that does not impair the effects of the present invention.
  • Rubber adhesive (1) As the rubber-based pressure-sensitive adhesive (1), any suitable rubber-based pressure-sensitive adhesive such as known rubber-based pressure-sensitive adhesives described in JP-A-2015-074771 is used as long as the effects of the present invention are not impaired. can be adopted.
  • the rubber-based pressure-sensitive adhesive (1) may be of only one type, or may be of two or more types.
  • the rubber-based pressure-sensitive adhesive (1) may contain any appropriate component within a range that does not impair the effects of the present invention.
  • silicone-based pressure-sensitive adhesive (1) any suitable silicone-based pressure-sensitive adhesive such as a known silicone-based pressure-sensitive adhesive described in Japanese Patent Laid-Open No. 2014-047280 is used as long as the effects of the present invention are not impaired. can be adopted. Only one kind of the silicone pressure-sensitive adhesive (1) may be used, or two or more kinds thereof may be used.
  • the silicone-based pressure-sensitive adhesive (1) may contain any appropriate component within a range that does not impair the effects of the present invention.
  • any suitable thickness can be adopted according to the purpose within a range that does not impair the effects of the present invention.
  • Such a thickness is preferably from 20 ⁇ m to 500 ⁇ m, more preferably from 20 ⁇ m to 300 ⁇ m, even more preferably from 20 ⁇ m to 200 ⁇ m, and particularly preferably from 20 ⁇ m to 20 ⁇ m, from the viewpoint that the effects of the present invention can be more expressed. 100 ⁇ m, most preferably between 20 ⁇ m and 80 ⁇ m.
  • the base film (1) includes a resin base film (1a).
  • the base film (1) may have a conductive layer (1b).
  • the conductive layer (1b) can be arranged, for example, between the adhesive layer (1) and the resin base film (1a).
  • the conductive layer (1b) may consist of only one layer, or may consist of two or more layers.
  • the conductive layer (1b) can be provided by forming it on any appropriate base material.
  • a substrate is preferably a resin substrate film (1a).
  • the conductive layer (1b) is formed by any suitable thin film forming method such as, for example, vacuum deposition, sputtering, ion plating, spray pyrolysis, chemical plating, electroplating, or a combination thereof.
  • a conductive layer is formed on any appropriate substrate (preferably, resin substrate film (1a)).
  • the vacuum vapor deposition method and the sputtering method are preferable from the viewpoints of the formation speed of the conductive layer, the formability of the large-area film, the productivity, and the like.
  • Materials for forming the conductive layer (1b) include, for example, metal-based materials such as gold, silver, platinum, palladium, copper, aluminum, nickel, chromium, titanium, iron, cobalt, tin, and alloys thereof; Metal oxide materials such as indium oxide, tin oxide, titanium oxide, cadmium oxide, and mixtures thereof; other metal compounds such as copper iodide; and the like are used.
  • any appropriate thickness can be adopted according to the purpose within a range that does not impair the effects of the present invention.
  • a thickness is, for example, preferably 30 ⁇ to 600 ⁇ when formed from a metal-based material, and preferably 80 ⁇ to 5000 ⁇ when formed from a metal oxide-based material.
  • the surface resistance value of the conductive layer (1b) is preferably 1.0 ⁇ 10 10 ⁇ / ⁇ or less, more preferably 1.0 ⁇ 10 9 ⁇ / ⁇ or less, still more preferably 1.0 ⁇ 10 ⁇ / ⁇ or less. It is 8 ⁇ / ⁇ or less, and particularly preferably 1.0 ⁇ 10 7 ⁇ / ⁇ or less.
  • corona discharge is applied to the surface of the substrate (preferably resin substrate film (1a)).
  • treatment ultraviolet irradiation treatment, plasma treatment, sputter etching treatment, undercoat treatment, or any other appropriate pretreatment to improve the adhesion between the conductive layer and the substrate (preferably, the resin substrate film (1a)). can also be increased.
  • the base film (1) may have an antistatic layer (1c).
  • the antistatic layer (1c) is typically between the adhesive layer (1) and the resin substrate film (1a) and/or between the resin substrate film (1a) and the adhesive layer (2). can be placed in
  • the antistatic layer (1c) may consist of only one layer, or may consist of two or more layers.
  • any appropriate thickness can be adopted according to the purpose within a range that does not impair the effects of the present invention.
  • Such a thickness is preferably 1 nm to 1000 nm, more preferably 5 nm to 900 nm, even more preferably 7.5 nm to 800 nm, and particularly preferably 10 nm to 700 nm.
  • the surface resistance value of the antistatic layer (1c) is preferably 1.0 ⁇ 10 10 ⁇ / ⁇ or less, more preferably 8.0 ⁇ 10 9 ⁇ / ⁇ or less, still more preferably 5.0 ⁇ 10 ⁇ / ⁇ or less. It is 10 9 ⁇ / ⁇ or less, and particularly preferably 1.0 ⁇ 10 9 ⁇ / ⁇ or less.
  • any suitable antistatic layer can be adopted as long as it is a layer capable of exhibiting an antistatic effect, as long as it does not impair the effects of the present invention.
  • the description of the antistatic layer (IIIc) in the section of release liner (III)>> may be used.
  • the pressure-sensitive adhesive layer (2) may consist of only one layer, or may consist of two or more layers.
  • the thickness of the pressure-sensitive adhesive layer (2) is preferably 0.5 ⁇ m to 150 ⁇ m, more preferably 1 ⁇ m to 100 ⁇ m, still more preferably 2 ⁇ m to 80 ⁇ m, in order to further express the effects of the present invention. Especially preferred is 3 ⁇ m to 50 ⁇ m, most preferred is 5 ⁇ m to 24 ⁇ m.
  • the adhesive layer (2) can be formed by any appropriate method.
  • a pressure-sensitive adhesive composition preferably acrylic pressure-sensitive adhesive composition (2)
  • forming the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (2) is applied to any suitable substrate (for example, , substrate film (2)), optionally heating and drying, and optionally curing to form an adhesive layer on the substrate.
  • suitable substrate for example, , substrate film (2)
  • coating methods include gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, air knife coater, spray coater, comma coater, direct coater, roll brush coater, and the like. method.
  • the adhesive layer (2) may contain other components (2).
  • the other component (2) may be of only one type, or may be of two or more types.
  • any appropriate other component can be adopted as long as the effects of the present invention are not impaired.
  • Such other components (1) include, for example, other polymer components, cross-linking accelerators, cross-linking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), Antiaging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, UV absorbers, antioxidants, light stabilizers, chain transfer agents, plasticizers, softeners, Surfactants, conductive components, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts and the like.
  • a typical example of the other component (2) is a conductive component. Only one type of conductive component may be used, or two or more types may be used. As the conductive component, any suitable conductive component can be adopted as long as the effects of the present invention are not impaired. Examples of such conductive components include ionic liquids, ion-conducting polymers, ion-conducting fillers, and electrically-conducting polymers.
  • the adhesive layer (2) is preferably composed of an acrylic adhesive (2).
  • the acrylic pressure-sensitive adhesive (2) is formed from the acrylic pressure-sensitive adhesive composition (2).
  • the acrylic pressure-sensitive adhesive composition (2) preferably contains an acrylic polymer (C) in that the effects of the present invention can be further expressed.
  • the acrylic polymer (C) can be called a so-called base polymer in the field of acrylic adhesives. Only one type of acrylic polymer may be used, or two or more types may be used.
  • the content of the acrylic polymer (C) in the acrylic pressure-sensitive adhesive composition (2) is preferably 60% by weight to 99.9% by weight, more preferably 65% by weight to 99.9% by weight, in terms of solid content. 9% by weight, more preferably 70% to 99.9% by weight, particularly preferably 75% to 99.9% by weight, most preferably 80% to 99.9% by weight .
  • Any suitable acrylic polymer can be adopted as the acrylic polymer (C) as long as it does not impair the effects of the present invention.
  • the weight-average molecular weight of the acrylic polymer (C) is preferably 300,000 to 2,500,000, more preferably 350,000 to 2,000,000, and still more preferably 400,000 in terms of allowing the effect of the present invention to be exhibited more. 1,800,000, particularly preferably 500,000 to 1,500,000.
  • the acrylic pressure-sensitive adhesive composition (2) may contain a cross-linking agent.
  • a cross-linking agent By using a cross-linking agent, the cohesive force of the acrylic pressure-sensitive adhesive can be improved, and the effects of the present invention can be exhibited more.
  • the number of cross-linking agents may be one, or two or more.
  • any appropriate content can be adopted for the content of the cross-linking agent in the acrylic pressure-sensitive adhesive composition (2) as long as the effects of the present invention are not impaired.
  • a content is, for example, preferably 0.05 parts by weight to 20 parts by weight with respect to the solid content (100 parts by weight) of the acrylic polymer (C) in terms of expressing the effects of the present invention more. parts, more preferably 0.1 to 18 parts by weight, still more preferably 0.5 to 15 parts by weight, and particularly preferably 0.5 to 10 parts by weight.
  • the acrylic pressure-sensitive adhesive composition (2) may contain any appropriate other component within a range that does not impair the effects of the present invention.
  • Such other components include, for example, polymer components other than acrylic polymers, cross-linking accelerators, cross-linking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), Antiaging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, UV absorbers, antioxidants, light stabilizers, chain transfer agents, plasticizers, softeners, Surfactants, antistatic agents, conductive agents, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts and the like.
  • the acrylic polymer (C) is preferably a (meth)acrylic acid alkyl ester in which the alkyl group in the (a component) alkyl ester portion has 4 to 12 carbon atoms, in order to further exhibit the effects of the present invention.
  • component b) an acrylic polymer (C) formed by polymerization from a composition (C) containing at least one selected from the group consisting of a (meth)acrylic acid ester having an OH group and (meth)acrylic acid is.
  • Component a) and (Component b) may each independently be one kind or two or more kinds.
  • Examples of the (meth)acrylic acid alkyl ester (component a) in which the alkyl group of the alkyl ester moiety has 4 to 12 carbon atoms include n-butyl (meth)acrylate, isobutyl (meth)acrylate, and (meth)acrylate.
  • s-butyl acrylate t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-(meth)acrylate Ethylhexyl, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate etc.
  • n-butyl (meth)acrylate and 2-ethylhexyl (meth)acrylate are preferred, and n-butyl acrylate and acrylic are more preferred, in that the effects of the present invention can be more expressed.
  • At least one (component b) selected from the group consisting of (meth)acrylic acid esters having an OH group and (meth)acrylic acid includes, for example, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, Examples thereof include (meth)acrylic acid esters having an OH group such as hydroxybutyl (meth)acrylate, and (meth)acrylic acid.
  • hydroxyethyl (meth)acrylate and (meth)acrylic acid are preferred, and hydroxyethyl acrylate and acrylic acid are more preferred, from the viewpoint that the effects of the present invention can be exhibited more.
  • the composition (C) may contain copolymerizable monomers other than the components (a) and (b).
  • the number of copolymerizable monomers may be one, or two or more.
  • Such copolymerizable monomers include, for example, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, acid anhydrides thereof (for example, acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride).
  • a polyfunctional monomer can also be employed as a copolymerizable monomer.
  • a polyfunctional monomer refers to a monomer having two or more ethylenically unsaturated groups in one molecule.
  • any suitable ethylenically unsaturated group can be adopted as long as the effects of the present invention are not impaired.
  • Such ethylenically unsaturated groups include, for example, radically polymerizable functional groups such as vinyl groups, propenyl groups, isopropenyl groups, vinyl ether groups (vinyloxy groups), and allyl ether groups (allyloxy groups).
  • polyfunctional monomers examples include hexanediol di(meth)acrylate, butanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (poly)propylene glycol di(meth)acrylate, and neopentyl glycol.
  • (Meth)acrylic acid alkoxyalkyl esters may also be employed as copolymerizable monomers.
  • Examples of (meth)acrylic acid alkoxyalkyl esters include 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, and 3-(meth)acrylate. methoxypropyl, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, 4-ethoxybutyl (meth)acrylate and the like.
  • the (meth)acrylic acid alkoxyalkyl ester may be used alone or in combination of two or more.
  • the content of the (meth)acrylic acid alkyl ester (component a) in which the alkyl group in the alkyl ester portion has 4 to 12 carbon atoms is such that the effects of the present invention can be more expressed, and the acrylic polymer (C) is It is preferably 30% by weight or more, more preferably 50% to 99% by weight, still more preferably 70% to 98% by weight, based on the total amount (100% by weight) of the constituent monomer components. It is preferably 90% to 98% by weight.
  • the content of at least one (component b) selected from the group consisting of (meth)acrylic acid esters having an OH group and (meth)acrylic acid is the acrylic polymer ( It is preferably 1% by weight or more, more preferably 1% to 30% by weight, still more preferably 2% to 20% by weight, relative to the total amount (100% by weight) of the monomer components constituting C). Yes, particularly preferably 3% to 10% by weight, most preferably 3% to 6% by weight.
  • composition (C) may contain any appropriate other component within a range that does not impair the effects of the present invention.
  • Such other components include, for example, polymerization initiators, chain transfer agents, solvents and the like. Any appropriate content can be adopted as the content of these other components as long as the effects of the present invention are not impaired.
  • a thermal polymerization initiator or a photopolymerization initiator can be used as the polymerization initiator. Only one polymerization initiator may be used, or two or more polymerization initiators may be used.
  • thermopolymerization initiator As a thermal polymerization initiator and a photopolymerization initiator (photoinitiator), [A-2-1-1. Preferred embodiment 1 of (meth)acrylic resin (1)] can be referred to.
  • the adhesive layer (2) may contain a conductive component. Only one type of conductive component may be used, or two or more types may be used. As the conductive component, any suitable conductive component can be adopted as long as the effects of the present invention are not impaired. Examples of such conductive components include ionic liquids, ion-conducting polymers, ion-conducting fillers, and electrically-conducting polymers.
  • the thickness of the base film (2) is preferably from 10 ⁇ m to 300 ⁇ m, more preferably from 20 ⁇ m to 200 ⁇ m, still more preferably from 30 ⁇ m to 150 ⁇ m, and particularly preferably, from the viewpoint that the effects of the present invention can be further expressed. is between 35 ⁇ m and 100 ⁇ m, most preferably between 35 ⁇ m and 80 ⁇ m.
  • the base film (2) includes a resin base film (2a).
  • the base film (2) may have a conductive layer (2b).
  • the conductive layer (2b) can be arranged between the adhesive layer (2) and the resin base film (2a).
  • the conductive layer (2b) may consist of only one layer, or may consist of two or more layers.
  • the base film (2) may have an antistatic layer (2c).
  • the antistatic layer (2c) can be arranged between the adhesive layer (2) and the resin-based film (2a) and/or on the side of the resin-based film (2a) opposite to the adhesive layer (2). .
  • the antistatic layer (2c) may consist of only one layer, or may consist of two or more layers.
  • any appropriate thickness can be adopted according to the purpose within a range that does not impair the effects of the present invention.
  • Such a thickness is preferably 1 nm to 1000 nm, more preferably 5 nm to 900 nm, even more preferably 7.5 nm to 800 nm, and particularly preferably 10 nm to 700 nm.
  • the antistatic layer (2c) may contain any appropriate other component within a range that does not impair the effects of the present invention.
  • the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention comprises a release liner (III), a pressure-sensitive adhesive layer (1), a base film ( 1) A laminate having a pressure-sensitive adhesive layer (2) and a base film (2) in this order, in which the portion with the lowest number of layers laminated is 3 or more layers and the portion with the highest number of layers laminated is 5 layers or more.
  • the pressure-sensitive adhesive layer (1) and the base film (1) are constituent elements of the pressure-sensitive adhesive tape (I) for protecting an optical member, and the pressure-sensitive adhesive layer (2) and the base film (2) are a holding tape.
  • One embodiment of the method for producing a pressure-sensitive adhesive tape for optical members has a release liner (III), a pressure-sensitive adhesive layer (1), and a base film (1) in this order.
  • Laminate (X) consisting of components (that is, laminate of release liner (III) and adhesive tape (I) for protecting optical members), adhesive layer (2) and base film (2) in this order holding tape (II) comprising these constituent elements, respectively, and then two or more adhesive tapes (I) for optical member protection are arranged on one holding tape (II) with a gap therebetween.
  • the surface of the base film (1) of the laminate (X) and the surface of the pressure-sensitive adhesive layer (2) of the holding tape (II) are adhered so that .
  • the laminate (X) is, for example, a pressure-sensitive adhesive composition (acrylic pressure-sensitive adhesive composition (1), urethane-based pressure-sensitive adhesive composition (1), rubber-based At least one selected from the group consisting of the pressure-sensitive adhesive composition (1) and the silicone-based pressure-sensitive adhesive composition (1)) is applied onto the base film (1), heated and dried as necessary, and to form the pressure-sensitive adhesive layer (1) on the base film (1), and then the surface of the pressure-sensitive adhesive layer (1) opposite to the base film (1) can be manufactured by attaching a release liner (III) (when it has a release layer (IIIb), that side).
  • a pressure-sensitive adhesive composition (acrylic pressure-sensitive adhesive composition (1), urethane-based pressure-sensitive adhesive composition (1), rubber-based At least one selected from the group consisting of the pressure-sensitive adhesive composition (1) and the silicone-based pressure-sensitive adhesive composition (1)) is applied onto the base film (1), heated and dried as necessary, and to form the pressure-sensitive adhesive layer (1) on the base film (1), and then the surface of the pressure-sensitive adhesive layer
  • the holding tape (II) is, for example, a pressure-sensitive adhesive composition forming the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (2) (preferably the group consisting of the acrylic pressure-sensitive adhesive (2) and the urethane-based pressure-sensitive adhesive (2) At least one selected from) is applied on the base film (2), heated and dried as necessary, cured as necessary, and the pressure-sensitive adhesive layer on the base film (2) (2) is formed.
  • any suitable separator e.g., release liner (III) film
  • release liner (III) film may be attached.
  • a chamfered portion In the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention, at least one of the corners formed on the opposing side surfaces of two adjacent pressure-sensitive adhesive tapes (I) for optical member protection with a gap therebetween is a chamfered portion,
  • the chamfer is preferably at least one selected from C-plane and R-plane.
  • any appropriate forming method can be adopted as long as the effects of the present invention are not impaired.
  • cutting processing using a cutting tool using a press machine laser cutting processing, cutting processing using an end mill, and the like can be mentioned.
  • the release liner (III) is peeled off from the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention.
  • the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention at least one of the corners formed on the opposing side surfaces of the two adjacent pressure-sensitive adhesive tapes (I) for protecting optical members across the gap is a chamfered portion.
  • two or more adhesive tapes (I) for optical member protection laminated in an arrangement having a gap on one holding tape (II) are held well. While held by the tape (II), it can be reliably peeled off at the interface between the release liner (III) and the adhesive tape (I) for protecting optical members.
  • the force that separates the release liner (III) from the adhesive tape (I) for protecting the optical member and the force that separates the adhesive tape (I) for protecting the optical member from the holding tape (II) are , can act in an appropriate balance, and can suppress the occurrence of conventional peeling abnormalities.
  • the adhesive tape for optical members (1) obtained in Example 1 (including the adhesive tape (1A) for optical member protection with a release liner, the adhesive tape (1B) for optical member protection with a release liner, and the holding tape ) was used as an example, the release liner peeling evaluation is as follows. Other examples and comparative examples were also tested in the same manner.
  • the optical member adhesive tape (1) is placed so that the holding tape side is adsorbed to the adsorption stage, and the corners of the release liner on the corners 2a and 2b of the optical member protection adhesive tape (1B) with a release liner. One of the parts was gripped by a chucking device.
  • a peeling roller is attached to the chucking device, and the peeling roller is fixed to the surface of the release liner.
  • the chucking device was caused to travel in the in-plane direction of the suction stage in the diagonal direction of the gripped corner at a speed of 10 mm/min.
  • the chucking device was run while being raised at an angle of 45 degrees with respect to the plane of the suction stage and at an angle of 30 degrees with respect to the vertical direction of the suction stage. That is, the angle between the pressure-sensitive adhesive tape for optical members (1) and the peeling direction was 45° in plan view, and the angle between the plane direction and the peeling direction was 30° in side view.
  • the release liner was peeled off from the pressure-sensitive adhesive tapes (1A) and (1B) for optical member protection. If the pressure-sensitive adhesive tapes (1A) and (1B) for optical member protection could be peeled off without following the release liner when peeled off, the evaluation result was regarded as peeling pass. This test was carried out on 10 samples and judged as follows. A: 9 out of 10 sheets passed peeling B: 5 out of 10 sheets passed peeling C: Less than 5 out of 10 sheets passed peeling
  • ⁇ Measurement of adhesive strength B> The sample was cut into a width of 25 mm and a length of 150 mm to obtain an evaluation sample.
  • the pressure-sensitive adhesive layer surface of the evaluation sample was adhered to the surface of the substrate layer described in each example and comparative example by one reciprocation of a 2.0 kg roller.
  • the storage elastic modulus G' corresponds to the portion stored as elastic energy when the material is deformed, and is an index representing the degree of hardness. Only the pressure-sensitive adhesive layer was taken out from the pressure-sensitive adhesive tape for optical member protection formed on the release liner described in each of Examples and Comparative Examples, laminated to a thickness of about 1 mm, punched into a diameter of 9 mm, and formed into a cylindrical shape. A pellet was produced and used as a sample for measurement. Using a dynamic viscoelasticity measuring device (manufactured by Rheometrics Co., Ltd., ARES), the obtained measurement sample was fixed to a ⁇ 8 mm parallel plate jig, and the storage elastic modulus G′ was calculated. The measurement conditions were as follows. Measurement: Shear mode Temperature range: -60°C to 210°C Heating rate: 5°C/min Frequency: 1Hz
  • Oligomer A had a weight average molecular weight of 5100 and a glass transition temperature (Tg) of 130°C.
  • the above prepolymer composition 100 parts by weight, 1,6-hexanedioldiacrylate (HDDA): 0.07 parts by weight, oligomer A prepared in Production Example 1: 3 parts by weight, and silane as post-addition components Coupling agent (“KBM403” manufactured by Shin-Etsu Chemical Co., Ltd.): After adding 0.3 parts by weight, these were uniformly mixed to obtain a pressure-sensitive adhesive composition (a) for pressure-sensitive adhesive tapes for protecting optical members.
  • HDDA 1,6-hexanedioldiacrylate
  • oligomer A prepared in Production Example 1 3 parts by weight
  • silane as post-addition components Coupling agent (“KBM403” manufactured by Shin-Etsu Chemical Co., Ltd.): After adding 0.3 parts by weight, these were uniformly mixed to obtain a pressure-sensitive adhesive composition (a) for pressure-sensitive adhesive tapes for protecting optical members.
  • the liquid temperature in the flask was maintained at around 65° C., and the polymerization reaction was carried out for 6 hours to prepare a solution (40% by weight) of an acrylic polymer having a weight average molecular weight of 550,000 to obtain an acrylic polymer for a holding tape. .
  • Example 1 A 75 ⁇ m-thick polyethylene terephthalate (PET) film (manufactured by Mitsubishi Chemical “Diafoil MRF75”) having a silicone-based release layer on the surface is used as a substrate (double release film), and on this substrate, in Production Example 2
  • the obtained pressure-sensitive adhesive composition (a) for the pressure-sensitive adhesive tape for optical member protection was applied so as to have a thickness of 25 ⁇ m to form a coating layer.
  • a 75 ⁇ m-thick PET film (“Diafoil MRE75” manufactured by Mitsubishi Chemical Co., Ltd.) having one side subjected to silicone release treatment was laminated as a cover sheet (which also serves as a light release film) onto this coating layer.
  • this laminate was irradiated with ultraviolet rays by a black light whose position was adjusted so that the irradiation intensity on the irradiation surface directly below the lamp was 5 mW/cm 2 , and photocuring was performed to form an adhesive sheet having a thickness of 25 ⁇ m. Obtained.
  • the light release film was peeled off from the adhesive sheet, and the film formed on the release liner was applied to one side of a 25 ⁇ m-thick polyimide base material (trade name “Upilex 25RN”, Ube Industries, Ltd.) prepared as a base layer. The adhesive layer was attached together.
  • the resulting structure was passed through a laminator at 80°C (0.3 MPa, speed 0.5 m/min) once, then aged in an oven at 50°C for 1 day to remove the heavy release film, and a new release liner was applied. (Diafoil MRF-50", Mitsubishi Plastics Co., Ltd.) was laminated. Thus, a release liner-attached pressure-sensitive adhesive tape (1) for optical member protection was obtained.
  • the obtained adhesive tape (1) for optical member protection with a release liner was press-cut and processed, and 10 cm in the longitudinal direction, 5 cm in the width direction, and 1a and 1b among the four corners were chamfered with C 0.5 mm.
  • the adhesive tape (1A) for optical member protection with a release liner (corresponding to the adhesive tape (I) 101 for optical member protection in FIG. 3), 2 cm in the longitudinal direction, 5 cm in the width direction, and four corners
  • An adhesive tape (1B) for optical member protection with a release liner in which 2a and 2b were chamfered with C0.5 mm (corresponding to adhesive tape (I) 102 for optical member protection in FIG. 3) was obtained.
  • the base film side of the adhesive tape (1A) for protecting optical members with a release liner and the adhesive for protecting optical members with a release liner were placed on the adhesive layer of the holding tape.
  • the base film side of the tape (1B) is placed so that there is a gap of 1 mm in length, and the chamfered portions 1a and 1b of the adhesive tape (1A) for protecting optical members with a release liner are optical tapes with a release liner.
  • the chamfered portions 2a and 2b of the adhesive tape for optical member protection (1B) with a release liner are aligned with the adhesive tape for optical member protection (1A) with a release liner so that they are on the side of the adhesive tape for member protection (1B). They were arranged so as to be on the opposite side and bonded together to obtain an adhesive tape for optical members (1). Table 1 shows the results.
  • Example 2 A pressure-sensitive adhesive tape (2) for optical members was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer was 15 ⁇ m and a release liner-attached pressure-sensitive adhesive tape (2) for optical member protection was obtained. Table 1 shows the results.
  • Example 3 A pressure-sensitive adhesive tape for optical members (3) was obtained in the same manner as in Example 2, except that the chamfering was C0.2 mm. Table 1 shows the results.
  • Example 4 A pressure-sensitive adhesive tape for optical members (4) was obtained in the same manner as in Example 2, except that the chamfering was C0.1 mm. Table 1 shows the results.
  • Example 5 A commercially available release liner (Diafoil MRF-38, Mitsubishi Plastics Co., Ltd.) was prepared.
  • the pressure-sensitive adhesive composition (b) for the pressure-sensitive adhesive tape for protecting optical members obtained in Production Example 3 was applied to one surface (release surface) of the release liner so that the thickness after drying was 25 ⁇ m, and the temperature was maintained at 130°C. and dried for 3 minutes.
  • a 25 ⁇ m-thick pressure-sensitive adhesive layer composed of the pressure-sensitive adhesive corresponding to the pressure-sensitive adhesive composition (b) for the pressure-sensitive adhesive tape for protecting optical members was formed on the release surface of the release liner, and the pressure-sensitive adhesive layer was kept at room temperature for 5 days. Aging was performed.
  • a 25 ⁇ m-thick polyimide base material (trade name “Upilex 25RN”, Ube Industries, Ltd.) was prepared as a base material layer.
  • the pressure-sensitive adhesive layer formed on the release liner was adhered to one surface of this base material layer.
  • the resulting structure was passed through a laminator at 80°C (0.3 MPa, speed 0.5 m/min) once, then aged in an oven at 50°C for 1 day, the release liner was removed, and a new release liner ( Diafoil MRF-50", Mitsubishi Plastics Co., Ltd.) was laminated.
  • a release liner-attached pressure-sensitive adhesive tape (5) for optical member protection was obtained.
  • a pressure-sensitive adhesive tape (5) for optical members was obtained in the same manner as in Example 2, except that the pressure-sensitive adhesive tape (5) for protecting optical members with a release liner was used as the pressure-sensitive adhesive tape for protecting optical members with a release liner. rice field. Table 1 shows the results.
  • Example 6 A pressure-sensitive adhesive tape for optical members (6) was obtained in the same manner as in Example 2, except that the chamfering was performed at a radius of 0.5 mm. Table 1 shows the results.
  • Example 7 A pressure-sensitive adhesive tape for optical members (7) was obtained in the same manner as in Example 2, except that the chamfering process was R0.1 mm. Table 1 shows the results.
  • Example 2 An optical member was produced in the same manner as in Example 2, except that a 50 ⁇ m-thick polyimide base material (trade name “Upilex 50RN”, Ube Industries, Ltd.) was used instead of the 25 ⁇ m-thick polyimide film, and the chamfering process was not performed. A pressure-sensitive adhesive tape (C2) was obtained. Table 1 shows the results.
  • the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention can be suitably used for attachment to foldable members and rollable members.
  • Typical examples of foldable members and rollable members include OLEDs. mentioned.
  • Adhesive tape for optical members 1000 Adhesive Tape for Optical Member Protection (I) 100, 101, 102, 103 Holding tape (II) 200 Adhesive layer (1) 11 Base film (1) 12 Adhesive layer (2) 21 Base film (2) 22 Release liner (III) 30 Gap L Corners 1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d Chamfer 1Ca, 1Cb Surface 10 Back side 20 side 40, 50, 60, 70

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)
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