WO2022172566A1

WO2022172566A1 - Pressure-sensitive adhesive tape for optical component

Info

Publication number: WO2022172566A1
Application number: PCT/JP2021/044888
Authority: WO
Inventors: 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: 2021-02-09
Filing date: 2021-12-07
Publication date: 2022-08-18
Also published as: TW202232207A; CN116917430A; KR20230145065A; JP2022121890A

Abstract

Provided is a pressure-sensitive adhesive tape for an optical component having a release liner, a pressure-sensitive adhesive tape for protecting an optical component, and a holding tape in the stated order, wherein a peeling abnormality when peeling the release liner can be suppressed despite a small thickness of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape for protecting an optical component.　The pressure-sensitive adhesive tape for an optical component according to an embodiment of the present invention comprises a pressure-sensitive adhesive tape (I) for protecting an optical component that has a pressure-sensitive adhesive layer (1) on one surface of a base film (1), a holding tape (II) directly laminated on the outermost surface of the pressure-sensitive adhesive tape (I) for protecting an optical component on the side opposite that of the pressure-sensitive adhesive layer (1), and 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 component, wherein two or more pressure-sensitive adhesive tapes (I) for protecting an optical component are laminated in an arrangement having a gap between the tapes, the thickness of the pressure-sensitive adhesive layer (1) is less than 25 μm, and at least one of corner portions formed on the opposing side surfaces of the two pressure-sensitive adhesive tapes (I) for protecting an optical component adjacent to each other across the gap is a chamfered portion.

Description

Adhesive tape for optical components

The present invention relates to an adhesive tape for optical members.

In order to stick two or more adhesive tapes for protecting optical members to an adherend without misalignment, the back side (the side opposite to the adhesive layer) of the two or more adhesive tapes for protecting optical members is combined into one holding tape. and the exposed surface of the adhesive layer of the adhesive tape for optical member protection is protected with a release liner to keep the exposed surface clean. A tape is known (see Patent Documents 1 to 3). Such a pressure-sensitive adhesive tape for optical members is used as follows.

First, peel off one release liner that protects the exposed surfaces of the adhesive layers of two or more optical member protective adhesive tapes. Next, two or more adhesive tapes for optical member protection are adhered to an adherend while being aligned while being held by one holding tape. Next, the holding tape can be peeled off to obtain a state in which two or more adhesive tapes for optical member protection are attached to a desired adherend.

Here, in the step prior to attaching the adhesive tape for optical members to an adherend, when the release liner is peeled off from the adhesive tape for optical members, peeling does not occur between the adhesive tape for optical member protection and the holding tape. In order to prevent this from occurring, it is necessary to appropriately adjust the peel strength between the adhesive tape for protecting optical members and the release liner and the adhesive strength between the adhesive tape for protecting optical members and the holding tape. On the other hand, in the stage after the release liner is peeled from the pressure-sensitive adhesive tape for optical members and attached to the adherend, when the holding tape is peeled off from the pressure-sensitive adhesive tape for optical members, the adherend should not be damaged. It is necessary to appropriately adjust the adhesive force between the adhesive tape for protecting optical members and the adherend and the peeling force between the adhesive tape for protecting optical members and the holding tape. In designing the pressure-sensitive adhesive tape for optical members, it is necessary to precisely design the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape for optical members in order to appropriately adjust the adhesive force and peeling force as described above.

　Recently, there is a trend toward thinning of target members and target products that use adhesive tapes for optical members, and there is a demand for thinner adhesive layers of adhesive tapes for protecting optical members.

However, if 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 A 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 according to the embodiment of the present invention 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 μm,
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.

In one embodiment, the chamfered portion is a C surface, and the chamfered amount of the chamfered portion is C0.05 mm or more.

In one embodiment, the chamfered portion is an R surface, and the chamfered amount of the chamfered portion is R0.05 mm or more.

In one embodiment, 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.

In one embodiment, the storage elastic modulus G' at 23°C of the adhesive constituting the adhesive layer (1) is 5.0 × 10 ⁵ Pa or less.

In one embodiment, in the side surfaces of the two or more adhesive tapes (I) for optical member protection laminated in the longitudinal direction of the one holding tape (II), on the side surfaces of both ends in the longitudinal direction. At least one of the formed corners is a chamfer.

According to the present invention, in 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 an optical member is thin, the release liner is It is possible to provide a pressure-sensitive adhesive tape for optical members that can suppress abnormal peeling when peeled.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of one embodiment of the adhesive tape for optical members of this invention. 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).

As used herein, "(meth)acrylic" means at least one selected from the group consisting of acrylic and methacrylic, and "(meth)acrylate" refers to at least one selected from the group consisting of acrylate and methacrylate. and "(meth)acryloyl" means at least one selected from the group consisting of acryloyl and methacryloyl.

≪≪A. Adhesive tape for optical components>>>>
The pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention 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. A holding tape (II) laminated directly on the outermost surface opposite to the pressure-sensitive adhesive layer (1) of (I), and the pressure-sensitive adhesive layer (1) of the pressure-sensitive adhesive tape (I) for protecting an optical member. and a release liner (III) laminated directly on the exposed surface, wherein two or more of the adhesive tapes (I) for optical member protection are arranged with gaps on one of the holding tapes (II). Laminated.

In the adhesive tape for optical members according to the embodiment of the present invention, the holding tape (II) typically has the adhesive layer (2) on one side of the base film (2).

Therefore, the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention 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 according to the embodiment of the present invention 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). wherein 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.

In the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention, 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.

As long as the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention has the structure described above, it 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.

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. 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.

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. As such a shape, 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.

Among the two or more adhesive tapes (I) for protecting optical members, 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.

In the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention, 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.

In the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention, 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). When 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). When 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. .

In the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention, the thickness of the pressure-sensitive adhesive layer (1) is thin, typically less than 30 μm, preferably less than 28 μm, more preferably less than 26 μm. It is preferably 21 μm or less, particularly preferably 16 μm or less. The lower limit of the thickness of the adhesive layer (1) is preferably 5 µm or more, more preferably 8 µm or more, even more preferably 10 µm or more, and particularly preferably 12 µm 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.

In the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention, 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.

In the adhesive tape for optical members according to the embodiment of the present invention, the adhesive tape for optical member protection (I) may have an antistatic layer on at least one surface thereof.

In the adhesive tape for optical members according to the embodiment of the present invention, the holding tape (II) may have an antistatic layer on at least one surface thereof.

In the adhesive tape for optical members according to the embodiment of the present invention, 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.

In the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention, 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.

In the 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 adhesive tapes for protecting optical members (I) with a gap therebetween is a chamfered portion. 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. In FIG. 3, two adhesive tapes (I) 101 and 102 for optical member protection are laminated on one holding tape (II) 200 with a gap therebetween. In FIG. 3, 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. In FIG. 3, among these corners,

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.

As described above, conventionally, when the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape for protecting optical members is thinned, when the release liner is peeled off, 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. 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. Therefore, when the release liner (III) is peeled off, 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. At this time, 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.

In FIG. 3, 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.

When the chamfered portion is a C surface, 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.

When the chamfered portion is an R surface, 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. In FIG. 4A, 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.

In the pressure-sensitive adhesive tape for an optical member according to the embodiment of the present invention, 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. For example, in the embodiment shown in FIG. 3, 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. When 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.

In the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention, 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. By adjusting the peeling force A within the above range, when the release liner is peeled from the adhesive tape for optical members, peeling hardly occurs between the adhesive tape for protecting optical members and the holding tape. The details of the method for measuring the peel force A will be described later.

In the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention, 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. 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.

In the adhesive tape for optical members according to the embodiment of the present invention, between the peeling force A and the adhesive force B, the peeling force A is preferably smaller than the adhesive force B. By adjusting the peeling force A to be smaller than the adhesive force B, when the release liner is peeled off from the adhesive tape for optical members, the peeling between the adhesive tape for optical member protection and the holding tape is increased. In addition, when peeling off the release liner and peeling off the holding tape from the adhesive tape for optical members attached to the adherend, damage to the adherend can be prevented.

In the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention, 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. In this case, a representative example of the foldable member or the rollable member is OLED.

«A-1. Release liner (III)»
The thickness of the release liner (III) is preferably from 1 μm to 300 μm, more preferably from 10 μm to 200 μm, still more preferably from 20 μm to 150 μm, and particularly from the point of view that the effects of the present invention can be exhibited more effectively. It is preferably between 35 μm and 100 μm, most preferably between 50 μm and 80 μm. 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).

Examples of the resin base film (IIIa) 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 α-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, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, chlorofluoroethylene-vinylidene fluoride a plastic film composed of a fluororesin such as a copolymer; and the like.

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. Examples of 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). When 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.

As the thickness of the release layer (IIIb), 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.

Examples of silicone-based release layers include addition-reactive silicone resins. Specific examples of 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.

As the antistatic layer (IIIc), 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. Specifically, for example, 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. Examples of such a conductive polymer include a conductive polymer obtained by doping a π-conjugated conductive polymer with a polyanion. Examples of π-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.

One embodiment of the release liner (III) includes a resin base film (IIIa) and a release layer (IIIb) in this order. Typically, this embodiment consists of a resin substrate film (IIIa) and a release layer (IIIb).

One embodiment of the release liner (III) comprises a resin base film (IIIa), an antistatic layer (IIIc) and a release layer (IIIb) in this order. Typically, this embodiment consists of a resin substrate film (IIIa), an antistatic layer (IIIc) and a release layer (IIIb).

Another embodiment of the 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. Typically, this embodiment consists of an antistatic layer (IIIc), a resin substrate film (IIIa), an antistatic layer (IIIc) and a release layer (IIIb).

«A-2. Adhesive layer (1)>>
Any appropriate pressure-sensitive adhesive layer can be adopted as the pressure-sensitive adhesive layer (1) as long as the effects of the present invention are not impaired. 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 μm, preferably 28 μm or less, more preferably 26 μm or less, and still more preferably 21 μm, in order to further express the effects of the present invention. or less, and particularly preferably 16 μm or less. The lower limit of the thickness of the adhesive layer (1) is preferably 5 µm or more, more preferably 8 µm or more, even more preferably 10 µm or more, and particularly preferably 12 µm 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. As such a method, for example, 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. Examples of such 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. As the other component (1), 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.

<A-2-1. Acrylic adhesive (1)>
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. 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.

Examples of 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. Among these, 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.

Examples of 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. 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.

Examples of epoxy-based cross-linking agents (polyfunctional epoxy compounds) 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, adipate diglycidyl ester, o-phthalate diglycidyl ester, triglycidyl-tris(2- hydroxyethyl)isocyanurate, resorcinol diglycidyl ether, bisphenol-S-diglycidyl ether, epoxy resins having two or more epoxy groups in the molecule, and the like. Examples of epoxy-based cross-linking agents include commercially available products such as the trade name "Tetrad C" (manufactured by Mitsubishi Gas Chemical Company, Inc.).

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. Such 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.

[A-2-1-1. Preferred embodiment 1 of (meth)acrylic resin (1)]
As a preferred embodiment 1 of the (meth)acrylic resin (1), 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. Formed by polymerization from a composition (A) containing a (meth)acrylic acid alkyl ester, (component b) at least one selected from the group consisting of (meth)acrylic acid esters having an OH group and (meth)acrylic acid (Meth)acrylic resin (A).

As the (meth)acrylic resin (A), 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) It is an acrylic resin (A), and more preferably, as (a component), a (meth)acrylic acid alkyl ester in which the alkyl group in the alkyl ester portion has 1 to 8 carbon atoms, and (b component) as OH A (meth)acrylic resin (A) formed by polymerization from a composition (A) that contains acrylic acid but does not contain a (meth)acrylic acid ester having a group, more preferably as the (a component) , a (meth)acrylic acid alkyl ester in which the alkyl group of the alkyl ester portion has 1 to 6 carbon atoms, and (component b) containing acrylic acid without containing a (meth)acrylic acid ester having an OH group, A (meth)acrylic resin (A) formed from a composition (A) by polymerization.

(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. Among these, 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. Among these, 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-hydroxyethyl (meth)acrylamide; ) amino group-containing monomers such as aminoethyl acrylate, dimethylaminoethyl (meth)acrylate, and t-butylaminoethyl (meth)acrylate; epoxy groups such as glycidyl (meth)acrylate and methylglycidyl (meth)acrylate; Containing monomers; cyano group-containing monomers such as acrylonitrile and methacrylonitrile; N-vinyl-2-pyrrolidone, (meth)acryloylmorpholine, N-vinylpiperidone, N-vinylpiperazine, N-vinylpyrrole, N-vinylimidazole, vinylpyridine , vinylpyrimidine, vinyl oxazole and other heterocycle-containing vinyl monomers; sulfonic acid group-containing monomers such as sodium vinyl sulfonate; phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate; imides such as cyclohexylmaleimide and isopropylmaleimide Group-containing monomers; isocyanate group-containing monomers such as 2-methacryloyloxyethyl isocyanate; (meth)acrylic acid esters having alicyclic hydrocarbon groups such as cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, and isobornyl (meth)acrylate (meth)acrylic acid esters having aromatic hydrocarbon groups such as phenyl (meth)acrylate, phenoxyethyl (meth)acrylate and benzyl (meth)acrylate; vinyl esters such as vinyl acetate and vinyl propionate; styrene, vinyl toluene aromatic vinyl compounds such as; olefins and dienes such as ethylene, butadiene, isoprene and isobutylene; vinyl ethers such as vinyl alkyl ether; vinyl chloride;

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. As the ethylenically unsaturated group, 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). Examples of polyfunctional monomers include hexanediol di(meth)acrylate, butanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (poly)propylene glycol di(meth)acrylate, and neopentyl glycol. Di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, allyl (Meth)acrylate, vinyl (meth)acrylate, divinylbenzene, epoxy acrylate, polyester acrylate, urethane acrylate, and the like. Only one such polyfunctional monomer may be used, or two or more thereof may be used.

(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 alkyl ester portion in the total amount (100% by weight) of the (meth)acrylic acid alkyl ester (component a) having 1 to 12 carbon atoms in the alkyl group of the alkyl ester portion, in that the effects of the present invention can be more expressed. 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.

The 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.

Depending on the type of polymerization reaction, a thermal polymerization initiator or a photopolymerization initiator (photoinitiator) 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. Examples of such thermal polymerization initiators include azo polymerization initiators, peroxide polymerization initiators (eg, dibenzoyl peroxide, tert-butyl permaleate, etc.), redox polymerization initiators, and the like. . Among these thermal polymerization initiators, 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). As the azo polymerization initiator, 2,2'-azobisisobutyronitrile (hereinafter sometimes referred to as AIBN), 2,2'-azobis-2-methylbutyronitrile (hereinafter referred to as AMBN) ), 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. Examples of photopolymerization initiators include benzoin ether-based photopolymerization initiators, acetophenone-based photopolymerization initiators, α-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.

Examples of benzoin ether-based photopolymerization initiators 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 α-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. Examples of benzophenone-based photopolymerization initiators include benzophenone, benzoylbenzoic acid, 3,3′-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, α-hydroxycyclohexylphenylketone, and the like. Examples of ketal-based photopolymerization initiators 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.

[A-2-1-2. Preferred embodiment 2 of (meth)acrylic resin (1)]
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. A (meth)acrylic resin (B) formed by polymerization from the composition (B), more preferably a (meth)acrylic acid ester having a cyclic structure in the molecule, and a linear or branched It is a (meth)acrylic resin (B) formed by polymerization from a composition (B) containing a (meth)acrylic acid alkyl ester having an alkyl group as a monomer component.

The cyclic structure (ring) of the (meth)acrylic acid ester having a cyclic structure in the molecule (hereinafter sometimes referred to as "ring-containing (meth)acrylic acid ester") is an aromatic ring or a non-aromatic ring may be either. Examples of 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.

Tricyclic or higher aliphatic hydrocarbon rings (tricyclic or higher bridged hydrocarbon rings) include, for example, a dicyclopentanyl group, a dicyclopentenyl group, an adamantyl group, a tricyclopentanyl group, and a tricyclopentenyl group. etc.

That is, 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)acrylates such as benzyl acid; and the like. Among these, 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). , dicyclopentanyl acrylate (DCPA) and dicyclopentanyl methacrylate (DCPMA), more preferably dicyclopentanyl acrylate (DCPA) and dicyclopentanyl methacrylate (DCPMA).

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. , (meth) butyl acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, (meth) hexyl acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, (meth) ) Decyl acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, (meth) hexadecyl acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecyl (meth) acrylate, eicosyl (meth) acrylate, lauryl (meth) acrylate, etc., where the alkyl group has 1 to 20 carbon atoms (Meth)acrylic acid alkyl esters can be mentioned. Among these, methyl methacrylate (MMA) and lauryl (meth)acrylate are preferable as the (meth)acrylic acid alkyl ester having a linear or branched alkyl group.

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, dimethylaminoethyl (meth)acrylate, t-butylaminoethyl (meth)acrylate cyano group-containing monomers such as acrylonitrile and methacrylonitrile; sulfonic acid group-containing monomers such as sodium vinyl sulfonate; phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate; isocyanate group-containing monomers such as ethyl isocyanate; imide group-containing monomers such as cyclohexylmaleimide and isopropylmaleimide; and the like.

The 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.

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.

<A-2-2. Urethane adhesive (1)>
As the urethane-based pressure-sensitive adhesive (1), 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.

<A-2-3. 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.

<A-2-4. Silicone adhesive (1)>
As the 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.

<<A-3. Base film (1)>>
As the thickness of the base film (1), 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 μm to 500 μm, more preferably from 20 μm to 300 μm, even more preferably from 20 μm to 200 μm, and particularly preferably from 20 μm to 20 μm, from the viewpoint that the effects of the present invention can be more expressed. 100 μm, most preferably between 20 μm and 80 μm.

The base film (1) includes a resin base film (1a).

<<A-1. The description of the resin base film (IIIa) in the section of Release Liner (III)>> may be used.

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. Such 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)). Among these thin film forming methods, 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.

As the thickness of the conductive layer (1b), 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, for example, preferably 30 Å to 600 Å when formed from a metal-based material, and preferably 80 Å to 5000 Å when formed from a metal oxide-based material.

The surface resistance value of the conductive layer (1b) is preferably 1.0×10 ¹⁰ Ω/□ or less, more preferably 1.0×10 ⁹ Ω/□ or less, still more preferably 1.0×10 Ω/□ or less. It is ⁸ Ω/□ or less, and particularly preferably 1.0×10 ⁷ Ω/□ or less.

When the conductive layer is formed on any suitable substrate (preferably resin substrate film (1a)), 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.

As the thickness of the antistatic layer (1c), 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 Ω/□ or less, more preferably 8.0×10 ⁹ Ω/□ or less, still more preferably 5.0×10 Ω/□ or less. It is 10 ⁹ Ω/□ or less, and particularly preferably 1.0×10 ⁹ Ω/□ or less.

As the antistatic layer (1c), 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. <<A-1. The description of the antistatic layer (IIIc) in the section of release liner (III)>> may be used.

«A-4. Adhesive layer (2)>>
Any appropriate pressure-sensitive adhesive layer can be adopted for the pressure-sensitive adhesive layer (2) as long as the effects of the present invention are not impaired. 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 μm to 150 μm, more preferably 1 μm to 100 μm, still more preferably 2 μm to 80 μm, in order to further express the effects of the present invention. Especially preferred is 3 μm to 50 μm, most preferred is 5 μm to 24 μm.

The adhesive layer (2) can be formed by any appropriate method. As such a method, for example, 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. Examples of such 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. As the other component (2), 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.

<A-4-1. Acrylic adhesive>
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. 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.

<A-2-1. The description in the section of Acrylic Pressure-sensitive Adhesive (1)> can be used.

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. Such 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. Among these, 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. acid 2-ethylhexyl.

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). ) and other carboxyl group-containing monomers (excluding (meth)acrylic acid); (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N-methylol(meth)acrylamide, N-methoxymethyl(meth)acrylamide , N-butoxymethyl (meth)acrylamide, amide group-containing monomers such as N-hydroxyethyl (meth)acrylamide; aminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, t-butyl (meth)acrylate amino group-containing monomers such as aminoethyl; epoxy group-containing monomers such as glycidyl (meth)acrylate and methylglycidyl (meth)acrylate; cyano group-containing monomers such as acrylonitrile and methacrylonitrile; N-vinyl-2-pyrrolidone, Heterocycle-containing vinyl-based monomers such as (meth)acryloylmorpholine, N-vinylpiperidone, N-vinylpiperazine, N-vinylpyrrole, N-vinylimidazole, vinylpyridine, vinylpyrimidine and vinyloxazole; sulfonic acids such as sodium vinylsulfonate Group-containing monomers; phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate; imide group-containing monomers such as cyclohexylmaleimide and isopropylmaleimide; isocyanate group-containing monomers such as 2-methacryloyloxyethyl isocyanate; (Meth)acrylic acid esters having alicyclic hydrocarbon groups such as cyclohexyl (meth)acrylate and isobornyl (meth)acrylate; aromatics such as phenyl (meth)acrylate, phenoxyethyl (meth)acrylate and benzyl (meth)acrylate (Meth)acrylic acid esters having a hydrocarbon group; vinyl esters such as vinyl acetate and vinyl propionate; aromatic vinyl compounds such as styrene and vinyltoluene; olefins and dienes such as ethylene, butadiene, isoprene and isobutylene; vinyl ethers such as alkyl ether; vinyl chloride; and the like.

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.

The 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-4-2. Conductive Component>
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.

<<A-5. Base film (2)>>
The thickness of the base film (2) is preferably from 10 μm to 300 μm, more preferably from 20 μm to 200 μm, still more preferably from 30 μm to 150 μm, and particularly preferably, from the viewpoint that the effects of the present invention can be further expressed. is between 35 μm and 100 μm, most preferably between 35 μm and 80 μm.

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.

<<A-3. The description of the conductive layer (1b) in the section "Base film (1)" may be used.

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.

As the thickness of the antistatic layer (2c), 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.

<<A-3. The description of the antistatic layer (1c) in the section "Base film (1)" may be used.

The antistatic layer (2c) may contain any appropriate other component within a range that does not impair the effects of the present invention.

≪≪B. Manufacturing method of adhesive tape for optical members>>>>
The pressure-sensitive adhesive tape for optical members according to the embodiments of the present invention can be produced by any appropriate method as long as the effects of the present invention are not impaired.

As a representative example of the method for producing 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 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. (II), wherein the outermost surface of the optical member protecting adhesive tape (I) opposite to the adhesive layer (1) and the adhesive layer (2) are directly laminated to form the adhesive The release liner (III) is directly laminated on the exposed surface of the agent layer (1), and two or more of the adhesive tapes (I) for protecting the optical member are arranged with gaps on one of the holding tapes (II). A case in which they are laminated will be described.

One embodiment of the method for producing a pressure-sensitive adhesive tape for optical members according to an embodiment of the present invention 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).

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. In order to protect the exposed surface of the pressure-sensitive adhesive layer (2), any suitable separator (e.g., release liner (III) film) may be attached.

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. As a method for forming the chamfered portion, any appropriate forming method can be adopted as long as the effects of the present invention are not impaired. For example, as a method for forming the chamfered portion of the C surface and the chamfered portion of the R surface, 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.

<<<C. How to use the adhesive tape for optical components>>>>
The pressure-sensitive adhesive tapes for optical members according to the embodiments of the present invention can be used in any appropriate method as long as the effects of the present invention are not impaired. Typical examples of such usage methods include the following methods.

(1) First, the release liner (III) is peeled off from the pressure-sensitive adhesive tape for optical members according to the embodiment of the present invention. At this time, 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 the two adjacent pressure-sensitive adhesive tapes (I) for protecting optical members across the gap is a chamfered portion. Thus, when the release liner (III) is peeled off, 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. 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. At this time, 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.

(2) Next, two or more adhesive tapes for protecting optical members are attached to the exposed adhesive layer (1) while being aligned with the adherend while being held by one holding tape. As a result, a laminate is obtained in which the pressure-sensitive adhesive tape (I) for optical member protection and the holding tape (II) are laminated in this order on the adherend.

(3) Finally, the holding tape (II) is peeled off from the laminate obtained in (2) above to obtain a state in which the optical member protecting pressure-sensitive adhesive tape (I) is attached to the adherend.

The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The tests and evaluation methods used in Examples and the like are as follows. "Parts" means "parts by weight" unless otherwise specified, and "%" means "% by weight" unless otherwise specified.

<Release liner peeling evaluation>
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. After that, 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. At that time, 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. Thus, 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 peel force A>
The sample was cut into a width of 25 mm and a length of 150 mm to obtain an evaluation sample. At a temperature of 23 ° C. and a humidity of 50% RH, a universal tensile tester (manufactured by Minebea Co., Ltd., product name: TCM-1kNB) was used to peel at a peel angle of 180 degrees and a tensile speed of 300 mm / min. was measured.

<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. In an atmosphere of 23° C. temperature and 50% RH, 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. After curing for 30 minutes in an atmosphere of temperature 23 ° C. and humidity 50% RH, using a universal tensile tester (manufactured by Minebea Co., Ltd., product name: TCM-1kNB), peel at a peel angle of 180 degrees and a tensile speed of 300 mm / min. and the adhesive force B was measured.

<Measurement of storage modulus G'>
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 φ8 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

[Production Example 1]
(Preparation of oligomer A)
Dicyclopentanyl methacrylate (DCPMA) as a monomer component: 60 parts by weight and methyl methacrylate (MMA): 40 parts by weight, α-thioglycerol as a chain transfer agent: 3.5 parts by weight, and toluene as a polymerization solvent: 100 The parts by weight were mixed and stirred at 70° C. for 1 hour under a nitrogen atmosphere. Next, 0.2 parts by weight of 2,2′-azobisisobutyronitrile (AIBN) as a thermal polymerization initiator was added and reacted at 70° C. for 2 hours. reacted over time. After that, the reaction solution was heated to 130° C. to remove the toluene, the chain transfer agent and the unreacted monomer by drying to obtain a solid acrylic oligomer (oligomer A). Oligomer A had a weight average molecular weight of 5100 and a glass transition temperature (Tg) of 130°C.

[Production Example 2]
(Preparation of adhesive composition (a) for adhesive tape for optical member protection)
As monomer components for forming the prepolymer, lauryl acrylate (LA): 40 parts by weight, 2-ethylhexyl acrylate (2EHA): 50 parts by weight, 4-hydroxybutyl acrylate (4HBA): 4 parts by weight, and N-vinyl-2- Pyrrolidone (NVP): 6 parts by weight, and BASF's "Irgacure 184" as a photopolymerization initiator: 0.015 parts by weight are blended, and polymerized by irradiating ultraviolet rays to obtain a prepolymer composition (polymerization rate: about 10 %) was obtained.
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.

[Production Example 3]
(Preparation of adhesive composition (b) for adhesive tape for optical member protection)
2-ethylhexyl acrylate (2EHA) as a monomer component: 63 parts by weight, N-vinyl-2-pyrrolidone (NVP): 15 parts by weight, methyl methacrylate (MMA): 9 parts by weight, 2-hydroxyethyl acrylate ( HEA): 13 parts by weight, 0.2 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 133 parts by weight of ethyl acetate as a polymerization solvent were put into a separable flask. , and stirred for 1 hour while nitrogen gas was introduced. After oxygen was removed from the polymerization system in this manner, the temperature was raised to 65° C. and the reaction was allowed to proceed for 10 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer solution having a solid concentration of 30% by weight.
An isocyanate cross-linking agent (trade name “Takenate D110N”, manufactured by Mitsui Chemicals, Inc.) was added to the obtained acrylic polymer solution, and the solid content of the acrylic polymer was 100 parts by weight in terms of solid content. to obtain a pressure-sensitive adhesive composition (b) for a pressure-sensitive adhesive tape for protecting an optical member.

[Production Example 4]
(Production of acrylic polymer for holding tape)
2-ethylhexyl acrylate (manufactured by Nippon Shokubai Co., Ltd.): 100 parts by weight, 2-hydroxyethyl acrylate (manufactured by Toagosei Co., Ltd.): 4 Parts by weight, 2,2'-azobisisobutyronitrile (manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator: 0.2 parts by weight, and ethyl acetate: 156 parts by weight were charged, and nitrogen gas was introduced while gently stirring. 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. .

[Production Example 5]
(Preparation of holding tape)
To the solution of the acrylic polymer for a holding tape produced in Production Example 4, 5 parts by weight of a cross-linking agent, Colonate HX (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a solid content, and Aqualon HS-10 are added to 100 parts by weight of the solid content. (Daiichi Kogyo Seiyaku Co., Ltd.) 0.3 parts by weight in terms of solid content, Envirizer OL-1 (manufactured by Tokyo Fine Chemical Co., Ltd.) as a crosslinking catalyst 0.03 parts by weight in terms of solid content was added, and the total solid content is diluted with ethyl acetate to 25% by weight, stirred with a disper, and dried on a base material "Lumirror S10" (thickness 38 μm, manufactured by Toray Industries, Inc.) made of polyester resin with a fountain roll so that the thickness after drying is 10 μm. It was cured and dried under the conditions of a drying temperature of 130° C. and a drying time of 30 seconds. Thus, a pressure-sensitive adhesive layer was produced on the substrate. Next, a silicone-treated surface of a 25 μm-thick polyester resin substrate having one surface silicone-treated was laminated to the surface of the pressure-sensitive adhesive layer to obtain a holding tape.

[Example 1]
A 75 μm-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 μm to form a coating layer. A 75 μm-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. From the cover sheet side, 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 μm. Obtained. After that, 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 μm-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.
Next, as shown in FIG. 3, on the adhesive layer of the holding tape, 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. 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 μm 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 μm, and the temperature was maintained at 130°C. and dried for 3 minutes. Thus, a 25 μm-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 μm-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. Thus, 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.

[Comparative Example 1]
A pressure-sensitive adhesive tape for optical members (C1) was obtained in the same manner as in Example 2, except that the chamfering process was not performed.
Table 1 shows the results.

[Comparative Example 2]
An optical member was produced in the same manner as in Example 2, except that a 50 μm-thick polyimide base material (trade name “Upilex 50RN”, Ube Industries, Ltd.) was used instead of the 25 μm-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

Claims

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 μm,
At least one of the corners formed on the opposing side surfaces of the two adhesive tapes for protecting optical members (I) adjacent to each other across the gap is a chamfered portion,
Adhesive tape for optical components.
The pressure-sensitive adhesive tape for optical members according to claim 1, wherein the chamfered portion is a C surface, and the chamfered amount of the chamfered portion is C0.05 mm or more.
The pressure-sensitive adhesive tape for optical members according to claim 1, wherein the chamfered portion is an R surface, and the chamfered amount of the chamfered portion is R0.05 mm or more.
Claim 1, wherein in an environment of temperature 23°C and humidity 50% RH, a peeling force A when peeling the release liner (III) is smaller than an adhesive force B when peeling the holding tape (II). 3. The pressure-sensitive adhesive tape for optical members according to any one of 1 to 3.
The pressure-sensitive adhesive for optical members according to any one of claims 1 to 4, wherein the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (1) has a storage elastic modulus G' at 23°C of 5.0 × 10 5 Pa or less. tape.
At least 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 the one holding tape (II) The pressure-sensitive adhesive tape for optical members according to any one of claims 1 to 5, wherein one of the chamfered portions is a chamfered portion.