Adhesive tape for optical components

Abstract

To provide an adhesive tape for optical member, comprising a release liner, an adhesive tape for optical member protection, and a holding tape in this order, where abnormal peeling when peeling the release liner can be suppressed even when an adhesive layer that the adhesive tape for optical member protection has is thin.SOLUTION: An adhesive tape for optical member comprises: an adhesive tape for optical member protection (I) 100 having an adhesive layer (1) 11 on one surface of a substrate film (1) 12; a holding tape (II) 200 laminated directly on the outermost surface opposite to the adhesive layer (1); and a release liner (III) 30 laminated directly on an exposed surface of the adhesive layer (1). On one of the holding tape (II), two or more adhesive tapes for optical member protection (I) are laminated in an arrangement where there are spaces therebetween. A thickness of the adhesive layer (1) is less than 25 μm. At least one of corner parts formed on side surfaces of two of the adhesive tapes for optical member protection (I) neighboring each other with the space therebetween is a chamfered part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to an adhesive tape for optical components. [Background technology]

[0002] To ensure that two or more adhesive tapes for protecting optical components are attached to a substrate without misalignment, the back sides (opposite the adhesive layer) of the two or more adhesive tapes for protecting optical components are held in place by a single retaining tape, creating a gap between them. The exposed surface of the adhesive layer of the adhesive tape is protected by a release liner to maintain the cleanliness of the exposed surface. Such adhesive tapes for optical components are used as follows.

[0003] First, peel off one release liner protecting the exposed adhesive layer of two or more optical component protective adhesive tapes. Next, with the two or more optical component protective adhesive tapes held in place by one retaining tape, align them and apply them to the substrate. Then, peel off the retaining tape to obtain a state where two or more optical component protective adhesive tapes are attached to the desired substrate.

[0004] In the stage prior to attaching the adhesive tape for optical components to the substrate, when peeling off the release liner from the adhesive tape for optical components, it is necessary to appropriately adjust the peeling force between the adhesive tape for optical component protection and the release liner, and the adhesive force between the adhesive tape for optical component protection and the retaining tape, so as not to cause peeling between the adhesive tape and the retaining tape. On the other hand, in the stage after peeling off the release liner from the adhesive tape for optical components and attaching it to the substrate, when peeling off the retaining tape from the adhesive tape for optical components, it is necessary to appropriately adjust the adhesive force between the adhesive tape for optical component protection and the substrate, and the peeling force between the adhesive tape for optical component protection and the retaining tape, so as not to damage the substrate. In designing adhesive tape for optical components, it is necessary to precisely design the adhesive layer of the adhesive tape for optical components in order to appropriately adjust the adhesive force and peeling force as described above.

[0005] Recently, there has been a trend towards making components and products that use adhesive tapes for optical components thinner, and there is a demand for thinner adhesive layers in adhesive tapes used to protect optical components.

[0006] However, if the adhesive layer of the adhesive tape for protecting optical components is made thinner, there is a risk of peeling abnormalities occurring when peeling off the release liner, in which some of the two or more adhesive tapes for protecting optical components held by the retaining tape may peel off the retaining tape while sticking to the release liner. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2017-142375 [Patent Document 2] Japanese Patent Publication No. 2017-212038 [Patent Document 3] Japanese Patent Publication No. 2017-219843 [Overview of the project] [Problems that the invention aims to solve]

[0008] The object of the present invention is to provide an adhesive tape for optical components having a release liner, an adhesive tape for protecting optical components, and a retaining tape in that order, which can suppress peeling abnormalities when peeling off the release liner even if the adhesive layer of the adhesive tape for protecting optical components is thin. [Means for solving the problem]

[0009] The adhesive tape for optical components according to an embodiment of the present invention is An adhesive tape (I) for protecting optical components having an adhesive layer (1) on one side of a base film (1), A retaining tape (II) is directly laminated on the outermost surface opposite to the adhesive layer (1) of the adhesive tape (I) for protecting the optical component, A release liner (III) directly laminated on the exposed surface of the adhesive layer (1) of the adhesive tape (I) for protecting an optical member, having, two or more adhesive tapes (I) for protecting an optical member are laminated on one holding tape (II) with a gap therebetween, the thickness of the adhesive layer (1) is less than 25 μm, at least one of the corners formed on the opposing side surfaces of two adjacent adhesive tapes (I) for protecting an optical member sandwiching the gap is a chamfered portion.

[0010] In one embodiment, the chamfered portion is a C surface, and the chamfer amount of the chamfered portion is C0.05 mm or more.

[0011] In one embodiment, the chamfered portion is an R surface, and the chamfer amount of the chamfered portion is R0.05 mm or more.

[0012] In one embodiment, the adhesive tape for an optical member has a peeling force A when peeling the release liner (III) smaller than an adhesive force B when peeling the holding tape (II) in an environment of a temperature of 23°C and a humidity of 50%RH.

[0013] 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.

[0014] In one embodiment, at least one of the corners formed on the side surfaces at both ends in the longitudinal direction among the side surfaces of two or more adhesive tapes (I) for protecting an optical member laminated in the longitudinal direction of one holding tape (II) is a chamfered portion.

Advantages of the Invention

[0015] According to the present invention, in an adhesive tape for an optical member having a release liner, an adhesive tape for protecting an optical member, and a holding tape in this order, even if the adhesive layer of the adhesive tape for protecting an optical member is thin, it is possible to provide an adhesive tape for an optical member that can suppress abnormal peeling when peeling the release liner.

Brief Description of Drawings

[0016] [Figure 1] It is a schematic cross-sectional view of one embodiment of the adhesive tape for an optical member of the present invention. [Figure 2] It is a schematic plan view showing some embodiments in which two or more adhesive tapes (I) for protecting an optical member are laminated in an arrangement having a gap in one holding tape (II). [Figure 3] It is a schematic plan view of one embodiment as seen from the adhesive layer (1) side of the laminate after peeling the release liner (III) from the adhesive tape for an optical member according to an embodiment of the present invention. [Figure 4] It is a schematic perspective view showing some embodiments of a corner portion and a chamfer portion that can be formed on the side surface of the adhesive tape (I) for protecting an optical member

Modes for Carrying Out the Invention

[0017] In this specification, “(meth)acryl” means at least one selected from the group consisting of acrylic and methacrylic, “(meth)acrylate” means 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.

[0018] ≪≪A. Adhesive Tape for Optical Member≫≫ An adhesive tape for optical components according to an embodiment of the present invention comprises: an adhesive tape for protecting optical components (I) having an adhesive layer (1) on one side of a base film (1); a retaining tape (II) directly laminated on the outermost surface of the adhesive tape for protecting optical components (I) opposite to the adhesive layer (1); and a release liner (III) directly laminated on the exposed surface of the adhesive layer (1) of the adhesive tape for protecting optical components (I), wherein two or more adhesive tapes for protecting optical components (I) are laminated on one retaining tape (II) in an arrangement with gaps between them.

[0019] In an adhesive tape for optical components according to an embodiment of the present invention, the retaining tape (II) typically has an adhesive layer (2) on one side of a base film (2).

[0020] Accordingly, an adhesive tape for optical components according to an embodiment of the present invention typically comprises an adhesive tape for protecting optical components (I) having an adhesive layer (1) on one side of a base film (1), and a retaining tape (II) having an adhesive layer (2) on one side of a base film (2), wherein the outermost surface of the adhesive tape for protecting optical components (I) opposite to the adhesive layer (1) and the adhesive layer (2) are directly laminated, and a release liner (III) is directly laminated on the exposed surface of the adhesive layer (1) of the adhesive tape for protecting optical components (I), wherein two or more adhesive tapes for protecting optical components (I) are laminated on one retaining tape (II) with gaps between them.

[0021] The adhesive tape for optical components according to an embodiment of the present invention is as described above, and to explain it more concisely, it is a laminate having a release liner (III), an adhesive layer (1), a base film (1), an adhesive layer (2), and a base film (2) in this order, with the fewest layers being 3 or more and the most numerous layers being 5 or more, wherein the adhesive layer (1) and the base film (1) are components of the adhesive tape for protecting optical components (I), and the adhesive layer (2) and the base film (2) are components of the retaining tape (II), the outermost surface of the adhesive tape for protecting optical components (I) opposite to the adhesive layer (1) and the adhesive layer (2) are directly laminated, the release liner (III) is directly laminated to the exposed surface of the adhesive layer (1), and two or more adhesive tapes for protecting optical components (I) are laminated on one retaining tape (II) with gaps between them.

[0022] In the adhesive tape for optical components according to embodiments of the present invention, each of the release liner (III), adhesive layer (1), base film (1), adhesive layer (2), and base film (2) may consist of only one layer or two or more layers.

[0023] The adhesive tape for optical components according to the embodiment of the present invention may have any other suitable layers, provided that the effects of the present invention are not impaired, as long as it has the above-described configuration. The other layers may be one type or two or more types. The total number of other layers may be one layer or two or more layers. Examples of other layers include an antistatic layer, which will be described later.

[0024] The number of layers in the area with the fewest layers of adhesive tape for optical components according to the embodiment of the present invention is preferably 3 to 8 layers, more preferably 3 to 6 layers, even more preferably 3 to 5 layers, particularly preferably 3 to 4 layers, and most preferably 3 layers, depending on the number of other layers as described above.

[0025] The number of layers in the area with the most layers of adhesive tape for optical components according to the embodiment of the present invention is preferably 5 to 10 layers, more preferably 5 to 8 layers, even more preferably 5 to 7 layers, particularly preferably 5 to 6 layers, and most preferably 5 layers, depending on the number of other layers as described above.

[0026] One embodiment of the adhesive tape for optical components of the present invention, as shown in Figure 1, is an adhesive tape 1000 for optical components in which a release liner (III) 30, an adhesive layer (1) 11, a base film (1) 12, an adhesive layer (2) 21, and a base film (2) 22 are directly laminated in this order. The adhesive layer (1) 11 and the base film (1) 12 constitute an adhesive tape (I) 100 for protecting optical components, and the adhesive layer (2) 21 and the base film (2) 22 constitute a retaining tape (II) 200. Two or more adhesive tapes (I) for protecting optical components (in the embodiment of Figure 1) 101 and 102 are laminated on one retaining tape (II) 200 with gaps between them.

[0027] The shape of the retaining tape (II) can be any suitable shape as long as it is a thick tape (also called a sheet), as long as it does not impair the effects of the present invention. Typical such shapes include those in which the longitudinal direction and width direction, which are substantially perpendicular to each other, are the long side and the short side, respectively.

[0028] The shape of the adhesive tape (I) for protecting optical components can be any suitable shape as long as it is a thick tape (also called a sheet), provided that it does not impair the effects of the present invention. Such a shape can be any suitable shape that matches the shape of the object to be adhered to. Typical examples of such shapes include a shape in which the longitudinal direction and the width direction, which are substantially perpendicular to each other, are the long side and the short side, respectively.

[0029] The two or more adhesive tapes (I) for protecting optical components that the adhesive tape for optical components of the present invention has may be the same size as each other, or at least two of them may be different sizes.

[0030] In two or more adhesive tapes (I) for protecting optical components, the distance L between two adjacent adhesive tapes (I) separated by a gap is preferably 0.1 mm to 5.0 mm, more preferably 0.2 mm to 3.0 mm, even 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.

[0031] In the adhesive tape for optical components according to an embodiment of the present invention, there may be two or three or more adhesive tapes (I) for protecting optical components that are laminated on a single retaining tape (II) in an arrangement with gaps between them.

[0032] In the adhesive tape for optical components according to an embodiment of the present invention, at least two of the two or more adhesive tapes (I) for protecting optical components that are laminated on a single retaining tape (II) with gaps between them are typically arranged along the longitudinal direction of the retaining tape (II). When there are two adhesive tapes (I) for protecting optical components that are laminated on a single retaining tape (II) with gaps between them, the two adhesive tapes (I) 101 and 102 for protecting optical components are laminated on a single retaining tape (II) 200 with gaps between them, as shown in the schematic plan view of Figure 2(a). When there are three adhesive tapes (I) for protecting optical components that are laminated on a single retaining tape (II) with gaps between them, the three adhesive tapes (I) 101, 102, and 103 for protecting optical components may be arranged on a single retaining tape (II) 200, for example, as shown in the schematic plan view of Figure 2(b), or as shown in the schematic plan view of Figure 2(c).

[0033] In the adhesive tape for optical components according to the embodiment of the present invention, the thickness of the adhesive layer (1) is thin, typically less than 30 μm, preferably 28 μm or less, more preferably 26 μm or less, even more preferably 21 μm 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. As long as the thickness of the adhesive layer (1) is within the above range, it is possible to accommodate the thinning of target components and target products using the adhesive tape for optical components according to the embodiment of the present invention while maintaining the required adhesive performance of the adhesive layer (1).

[0034] In the adhesive tape for optical components according to an embodiment of the present invention, the release liner (III), adhesive layer (1), base film (1), adhesive layer (2), and base film (2) may each have an antistatic layer on at least one of their surfaces.

[0035] In an adhesive tape for optical components according to an embodiment of the present invention, the adhesive tape (I) for protecting optical components may have an antistatic layer on at least one of its surfaces.

[0036] In an adhesive tape for optical components according to an embodiment of the present invention, the retaining tape (II) may have an antistatic layer on at least one of its surfaces.

[0037] In the adhesive tape for optical components according to an embodiment of the present invention, the adhesive layer (1) may contain a conductive component. The conductive component may be one type or two or more types.

[0038] In the adhesive tape for optical components according to an embodiment of the present invention, the adhesive layer (2) may contain a conductive component. The conductive component may be one type or two or more types.

[0039] In the adhesive tape for optical components according to an embodiment of the present invention, at least one of the corners formed on the opposing sides of two adjacent adhesive tapes (I) for protecting optical components separated by a gap is a chamfered portion. Figure 3 is a schematic plan view of one embodiment of the laminate after the release liner (III) has been peeled off from the adhesive tape for optical components according to an embodiment of the present invention, as seen from the adhesive layer (1) side. In Figure 3, two adhesive tapes (I) 101 and 102 for protecting optical components are laminated on one retaining tape (II) 200 with a gap between them. In Figure 3, the two adhesive tapes (I) 101 and 102 for protecting optical components are adjacent with a gap between them, and the adhesive tape (I) 101 has corners 1a, 1b, 1c, and 1d on its side surface, while the adhesive tape (I) 102 has corners 2a, 2b, 2c, and 2d on its side surface. In Figure 3, among these corners, corners 1a, 1b, 2c, and 2d correspond to the corners formed on the opposing sides of the two optical component protective adhesive tapes (I) 101 and 102. Therefore, in Figure 3, at least one of the corners 1a, 1b, 2c, and 2d formed on the opposing sides of the two optical component protective adhesive tapes (I) 101 and 102 is a chamfered portion.

[0040] As mentioned above, conventionally, when the adhesive layer of an adhesive tape for protecting optical components is thinned, a peeling abnormality occurs when peeling off the release liner, in which some of the two or more adhesive tapes for protecting optical components held by the retaining tape peel off the retaining tape while sticking to the release liner, resulting in a major problem such as a decrease in yield. In the adhesive tape for optical components according to the embodiment of the present invention, at least one of the corners formed on the opposing sides of two adjacent adhesive tapes (I) for protecting optical components separated by a gap is a chamfered portion, so when peeling off the release liner (III), two or more adhesive tapes (I) for protecting optical components, which are laminated on a single retaining tape (II) with a gap between them, can be reliably peeled off at the interface between the release liner (III) and the adhesive tapes (I) for protecting optical components while being well held by the retaining tape (II). This is because, when the release liner (III) is peeled off, the force that tries to separate the release liner (III) from the adhesive tape (I) and the force that tries to separate the adhesive tape (I) from the retaining tape (II) act in an appropriate balance, thereby suppressing the occurrence of peeling abnormalities that were common in conventional methods.

[0041] In Figure 3, the two adhesive tapes (I) 101 and 102 for protecting optical components have a rectangular shape, with their longitudinal and width directions being substantially perpendicular to each other, and thus each has four corners on its side. However, if the adhesive tape (I) for protecting optical components does not have the rectangular shape described above, the number of corners may be less than four or five or more.

[0042] The shape of the chamfered portion can be any suitable shape, as long as it does not impair the effects of the present invention. In terms of better manifestation of the effects of the present invention, the chamfered portion is preferably at least one selected from C-faces and R-faces.

[0043] When the chamfered portion is a C-chamfer, the amount of chamfering of the chamfered portion is preferably C0.05 mm or more, more preferably C0.05 mm to C5 mm, even more preferably C0.1 mm to C1 mm, and particularly preferably C0.15 mm to C0.5 mm, in order to better exhibit the effects of the present invention.

[0044] When the chamfered portion is an R-shaped surface, the amount of chamfering of the chamfered portion is preferably R0.05 mm or more, more preferably R0.05 mm to R5 mm, even more preferably R0.1 to R1 mm, and particularly preferably R0.15 mm to R0.5 mm, in order to better exhibit the effects of the present invention.

[0045] Figure 4 is a schematic perspective view showing several embodiments of corners and chamfers that may be formed on the side surface of the adhesive tape (I) for protecting optical components.

[0046] Figure 4(a) shows an adhesive tape (I) 101 for protecting optical components, which has four corners 1a, 1b, 1c, and 1d. In Figure 4(a), the adhesive tape (I) 101 for protecting optical components has a surface 10, a back surface 20, and sides 40, 50, 60, and 70, with sides 40 and 50 forming corner 1a, sides 50 and 60 forming corner 1b, sides 60 and 70 forming corner 1c, and sides 70 and 40 forming corner 1d. None of the four corners 1a, 1b, 1c, and 1d in Figure 4(a) are chamfered.

[0047] Figure 4(b) shows the adhesive tape (I) 101 for protecting optical components shown in Figure 4(a), with chamfered edges on the corners 1a and 1b, comprising chamfered portion 1Ca, chamfered portion 1Cb, corner 1c, and corner 1d.

[0048] Figure 4(c) shows the adhesive tape (I) 101 for protecting optical components shown in Figure 4(a), with the corners 1a and 1b having R-shaped chamfering, and includes chamfered portion 1Ra, chamfered portion 1Rb, corner 1c, and corner 1d.

[0049] In the adhesive tape for optical components according to an embodiment of the present invention, it is preferable that, in order to better demonstrate the effects of the present invention, at least one of the corners formed on the sides of the two or more adhesive tapes (I) for protecting optical components, which are laminated in the longitudinal direction of one retaining tape (II), is a chamfered portion. These corners formed on the sides of the two sides of the optical components, which are the corners 1c, 1d, 2a, and 2b of the two adhesive tapes (I) 101 and 102 in the longitudinal direction, are, for example, corners 1c, 1d, 2a, and 2b of the two adhesive tapes (I) 101 and 102 for protecting optical components, in the embodiment shown in Figure 3. If at least one of the corners formed on the sides of the two or more adhesive tapes (I) for protecting optical components, which are laminated in the longitudinal direction of one retaining tape (II), is a chamfered portion, then when peeling off the release liner (III), the force that tries to separate the release liner (III) from the adhesive tape (I) for protecting optical components and the force that tries to separate the adhesive tape (I) from the retaining tape (II) can act in an appropriate balance, and the occurrence of peeling abnormalities can be further suppressed.

[0050] In the adhesive tape for optical components according to an embodiment of the present invention, the peeling force A when peeling off the release liner (III) in an environment of 23°C and 50% RH is preferably 0.15 N / 25 mm or less, more preferably 0.001 N / 25 mm to 0.10 N / 25 mm, even more preferably 0.005 N / 25 mm to 0.07 N / 25 mm, and particularly preferably 0.01 N / 25 mm to 0.05 N / 25 mm. By adjusting the above peeling force A to within the above range, peeling is less likely to occur between the adhesive tape for protecting the optical component and the retaining tape when peeling off the release liner from the adhesive tape for optical components. Details of the method for measuring the above peeling force A will be described later.

[0051] In the adhesive tape for optical components according to an embodiment of the present invention, the adhesive force B when peeling off the retaining tape (II) in an environment of 23°C and 50% RH is preferably 1.00 N / 25 mm or less, more preferably 0.01 N / 25 mm to 0.50 N / 25 mm, even more preferably 0.02 N / 25 mm to 0.30 N / 25 mm, and particularly preferably 0.02 N / 25 mm to 0.10 N / 25 mm. By adjusting the adhesive force B within the above range, if it is below the upper limit, damage to the adherend can be prevented when peeling off the retaining tape from the adhesive tape for optical components that has been attached to the adherend after peeling off the release liner, and if it is above the lower limit, accidental peeling due to transport can be prevented. Details of the method for measuring the adhesive force B will be described later.

[0052] In the adhesive tape for optical components according to an embodiment of the present invention, 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 peeling the release liner from the adhesive tape for optical components, peeling between the adhesive tape for protecting the optical component and the retaining tape becomes less likely, and when peeling the retaining tape from the adhesive tape for optical components that has been attached to the adherend after peeling off the release liner, less damage is caused to the adherend.

[0053] In the adhesive tape for optical components according to an embodiment of the present invention, the storage modulus G' of the adhesive constituting the adhesive layer (1) at 23°C is preferably 5.0 × 10 5 It is less than or equal to Pa, and more preferably 1.0 × 10⁻⁶ 4 Pa~3.0×10 5 Pa is preferred, and more preferably 1.0 × 10 4 Pa~2.0×10 5 Pa is particularly preferred, and 1.0 × 10 4 Pa~1.0×10 5 The value is Pa. If the storage modulus G' of the adhesive constituting the adhesive layer (1) at 23°C is within the above range, the effects of the present invention can be more fully realized.

[0054] The adhesive tape for optical components according to the embodiment of the present invention preferably has a total light transmittance of 20% or more, more preferably 30% to 100%, even more preferably 50% to 100%, particularly preferably 83% to 100%, and most preferably 85% to 100%. The method for measuring the above total light transmittance will be described later.

[0055] The adhesive tape for optical components according to the embodiment of the present invention has a haze of preferably 20% or less, more preferably 0% to 20%, even more preferably 0% to 15%, particularly preferably 0% to 12%, and most preferably 0% to 10%. The method for measuring the haze will be described later.

[0056] The adhesive tape for optical components according to the embodiments of the present invention can be used in various applications. In order to more effectively utilize the effects of the present invention, the adhesive tape for optical components according to the embodiments of the present invention is preferably used for attachment to foldable components or rollable components. In this case, typical examples of foldable components and rollable components are OLEDs.

[0057] ≪A-1. Release Liner (III)≫ The thickness of the release liner (III) is preferably 1 μm to 300 μm, more preferably 10 μm to 200 μm, even more preferably 20 μm to 150 μm, particularly preferably 35 μm to 100 μm, and most preferably 50 μm to 80 μm, in order to better exhibit the effects of the present invention. If the thickness of the release liner (III) is too small compared to the above range, the curl suppression effect may decrease. If the thickness of the release liner (III) is too large compared to the above range, there is a risk that the adhesive tape for optical components according to the embodiment of the present invention may easily lift when bent.

[0058] The release liner (III) includes a resin substrate film (IIIa).

[0059] Examples of resin-based films (IIIa) include: plastic films made from polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT); plastic films made from olefin resins with α-olefins as monomer components, such as polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer (EVA); plastic films made from polyvinyl chloride (PVC); plastic films made from vinyl acetate resins; plastic films made from polycarbonate (PC); and polyphenylene sulfide (PPS). Examples include: plastic films composed of; plastic films composed of amide resins such as polyamide (nylon) and fully aromatic polyamide (aramid); plastic films composed of polyimide resins; plastic films composed of polyetheretherketone (PEEK); plastic films composed of olefin resins such as polyethylene (PE) and polypropylene (PP); and plastic films composed of fluorine resins such as polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, and chlorofluoroethylene-vinylidene fluoride copolymer.

[0060] The resin substrate film (IIIa) may consist of only one layer or two or more layers. The resin substrate film (IIIa) may also be stretched.

[0061] The resin substrate film (IIIa) may be surface-treated. Examples of surface treatments include corona treatment, plasma treatment, chromic acid treatment, ozone exposure, flame exposure, high-voltage electric shock exposure, ionizing radiation treatment, and coating treatment with an undercoat.

[0062] The resin base film (IIIa) may contain any suitable additive as long as the effects of the present invention are not impaired.

[0063] The release liner (III) may have a release layer (IIIb) in order to enhance the peelability from the adhesive layer (1). When the release liner (III) has a release layer (IIIb), typically, the side of the release layer (IIIb) is directly laminated on the adhesive layer (1).

[0064] As the forming material of the release layer (IIIb), any suitable forming material can be adopted 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-based release agents are preferred. The release layer (IIIb) can be formed as a coating layer.

[0065] As the thickness of the release layer (IIIb), any suitable thickness can be adopted according to the purpose as long as the effects of the present invention are not impaired. Such a thickness is preferably 10nm to 2000nm, more preferably 10nm to 1500nm, still more preferably 10nm to 1000nm, and particularly preferably 10nm to 500nm.

[0066] The release layer (IIIb) may be only one layer or two or more layers.

[0067] Examples of the silicone-based release layer include addition reaction type silicone resins. Specific examples of the addition reaction type silicone resins include, for example, KS-774, KS-775, KS-778, KS-779H, KS-847H, KS-847T manufactured by Shin-Etsu Chemical Co., Ltd.; TPR-6700, TPR-6710, TPR-6721 manufactured by Toshiba Silicone Co., Ltd.; SD7220, SD7226 manufactured by Toray Dow Corning Co., Ltd.; and the like. The coating amount (after drying) of the silicone-based release layer is preferably 0.01g / m 2 ~2g / m 2 and more preferably 0.01g / m2 ~1g / m 2 And more preferably 0.01 g / m 2 ~0.5g / m 2 That is the case.

[0068] The release layer (IIIb) can be formed, for example, by applying the above-mentioned release material onto any suitable layer using a conventionally known coating method such as reverse gravure coating, bar coating, or die coating, and then curing it by heat treatment, usually at around 120 to 200°C. Alternatively, heat treatment may be combined with active energy ray irradiation, such as ultraviolet irradiation, as needed.

[0069] The release liner (III) may have an antistatic layer (IIIc).

[0070] The thickness of the antistatic layer (IIIc) can be any appropriate thickness as long as it 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.

[0071] The antistatic layer (IIIc) may consist of only one layer or two or more layers.

[0072] As the antistatic layer (IIIc), any suitable antistatic layer can be used, provided that it is capable of providing an antistatic effect and does not impair the effects of the present invention. Preferably, such an antistatic layer is formed by coating a conductive coating liquid containing a conductive polymer onto any suitable substrate layer. Specifically, for example, it is an antistatic layer formed by coating a conductive coating liquid containing a conductive polymer onto a resin substrate film (IIIa). Specific coating methods include roll coating, bar coating, and gravure coating.

[0073] As the conductive polymer, any suitable conductive polymer can be used as long as it does not impair the effects of the present invention. Examples of such conductive polymers include conductive polymers doped with polyanions in a π-conjugated conductive polymer. Examples of π-conjugated conductive polymers include chain-like conductive polymers such as polythiophene, polypyrrole, polyaniline, and polyacetylene. Examples of polyanions include polystyrene sulfonic acid, polyisoprene sulfonic acid, polyvinyl sulfonic acid, polyallyl sulfonic acid, polyethyl sulfonic acid, and polymethacrylic acid. There may be only one conductive polymer or two or more conductive polymers.

[0074] One embodiment of the release liner (III) includes a resin base film (IIIa) and a release layer (IIIb) in that order. Typically, this embodiment consists of a resin base film (IIIa) and a release layer (IIIb).

[0075] One embodiment of the release liner (III) includes a resin base film (IIIa), an antistatic layer (IIIc), and a release layer (IIIb) in that order. Typically, this embodiment consists of a resin base film (IIIa), an antistatic layer (IIIc), and a release layer (IIIb).

[0076] Another embodiment of the release liner (III) includes an antistatic layer (IIIc), a resin substrate film (IIIa), an antistatic layer (IIIc), and a release layer (IIIb) in that order. Typically, this embodiment consists of an antistatic layer (IIIc), a resin substrate film (IIIa), an antistatic layer (IIIc), and a release layer (IIIb).

[0077] ≪A-2. Adhesive layer (1)≫ The adhesive layer (1) can be any suitable adhesive layer, as long as it does not impair the effects of the present invention. The adhesive layer (1) may consist of only one layer or two or more layers.

[0078] The thickness of the adhesive layer (1) is typically less than 30 μm, preferably 28 μm or less, more preferably 26 μm or less, even more preferably 21 μm or less, and particularly preferably 16 μm or less, in order to better exhibit the effects of the present invention. 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 adhesive layer (1) is within the above range, it is possible to accommodate the thinning of target members and target products using the adhesive tape for optical members according to the embodiment of the present invention while maintaining the adhesive performance required for the adhesive layer (1).

[0079] The adhesive layer (1) is preferably composed of at least one selected from the group consisting of acrylic adhesive (1), urethane adhesive (1), rubber adhesive (1), and silicone adhesive (1). The adhesive layer (1) is more preferably an acrylic adhesive (1) in that it can better exhibit the effects of the present invention.

[0080] The adhesive layer (1) can be formed by any suitable method. For example, one such method involves applying an adhesive composition (at least one selected from the group consisting of acrylic adhesive composition (1), urethane adhesive composition (1), rubber adhesive composition (1), and silicone adhesive composition (1)) that forms the adhesive constituting the adhesive layer (1) onto any suitable substrate (e.g., a substrate film (1)), heating and drying as necessary, and curing as necessary to form an adhesive layer on the substrate. For example, such application methods include gravure roll coaters, reverse roll coaters, kiss roll coaters, dip roll coaters, bar coaters, knife coaters, air knife coaters, spray coaters, comma coaters, direct coaters, and roll brush coaters.

[0081] The adhesive layer (1) may contain other components (1). The other components (1) may be only one type or two or more types. As the other components (1), any appropriate other components 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, crosslinking accelerators, crosslinking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), antioxidants, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foil-like materials, ultraviolet 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, etc.

[0082] Typically, a conductive component is cited as the other component (1). The conductive component may be only one type or two or more types. As the conductive component, any appropriate conductive component can be adopted as long as the effects of the present invention are not impaired. Such conductive components include, for example, ionic liquids, ion-conductive polymers, ion-conductive fillers, electrically conductive polymers, etc.

[0083] <A-2-1. Acrylic Adhesive (1)> The adhesive layer (1) is preferably composed of an acrylic adhesive (1).

[0084] The acrylic adhesive (1) is formed from an acrylic adhesive composition (1).

[0085] The acrylic adhesive composition (1) contains a (meth)acrylic resin (1). The (meth)acrylic resin (1) may be only one type or two or more types.

[0086] The content of (meth)acrylic resin (1) in the acrylic adhesive composition (1) is preferably 60% to 99.9% by weight, more preferably 65% ​​to 99.9% by weight, even more preferably 70% to 99.9% by weight, particularly preferably 75% to 99.9% by weight, and most preferably 80% to 99.9% by weight, based on solid content.

[0087] As the (meth)acrylic resin (1), any suitable (meth)acrylic resin can be used, as long as it does not impair the effects of the present invention.

[0088] 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, even more preferably 400,000 to 1,800,000, and particularly preferably 500,000 to 1,500,000, in order to better exhibit the effects of the present invention.

[0089] The acrylic adhesive composition (1) may contain a crosslinking agent. By using a crosslinking agent, the cohesive force of the acrylic adhesive (1) can be improved, and the effects of the present invention can be further exhibited. There may be only one type of crosslinking agent, or there may be two or more types.

[0090] Examples of crosslinking agents include polyfunctional isocyanate crosslinking agents, epoxy crosslinking agents, melamine crosslinking agents, peroxide crosslinking agents, as well as urea crosslinking agents, metal alkoxide crosslinking agents, metal chelate crosslinking agents, metal salt crosslinking agents, carbodiimide crosslinking agents, oxazoline crosslinking agents, aziridine crosslinking agents, and amine crosslinking agents. Among these, at least one selected from the group consisting of polyfunctional isocyanate crosslinking agents and epoxy crosslinking agents is preferred in terms of being able to better express the effects of the present invention.

[0091] Examples of polyfunctional isocyanate crosslinking agents include lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; alicyclic polyisocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, and hydrogenated xylene diisocyanate; and aromatic polyisocyanates such as 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, and xylylene diisocyanate. Examples of polyfunctional isocyanate crosslinking agents include commercially available products such as trimethylolpropane / tolylene diisocyanate adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate L"), trimethylolpropane / hexamethylene diisocyanate adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate HL"), trade name "Coronate HX" (manufactured by Nippon Polyurethane Industry Co., Ltd.), and trimethylolpropane / xylylene diisocyanate adduct (manufactured by Mitsui Chemicals, Inc., trade name "Takenate 110N").

[0092] Examples of epoxy crosslinking agents (polyfunctional epoxy compounds) include N,N,N',N'-tetraglycidyl-m-xylenediline, diglycidylaniline, 1,3-bis(N,N-diglycidylaminomethyl)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, and sorbitol polyglycidyl ether. Examples of epoxy crosslinking agents include diglycidyl ethers, glycerol polyglycidyl ethers, pentaerythritol polyglycidyl ethers, polyglycerol polyglycidyl ethers, sorbitan polyglycidyl ethers, trimethylolpropane polyglycidyl ethers, diglycidyl adipate esters, diglycidyl o-phthalate esters, triglycidyl-tris(2-hydroxyethyl) isocyanurate, resorcinol diglycidyl ethers, bisphenol-S-diglycidyl ethers, and epoxy resins having two or more epoxy groups in the molecule. Commercially available epoxy crosslinking agents include the trade name "Tetrad C" (manufactured by Mitsubishi Gas Chemical Company, Inc.).

[0093] The amount of crosslinking agent in the acrylic adhesive composition (1) can be any appropriate amount, as long as it does not impair the effects of the present invention. For example, in order to better express the effects of the present invention, the amount is preferably 30 parts by weight or less, more preferably 0.05 parts by weight to 20 parts by weight, even more preferably 0.1 parts by weight to 18 parts by weight, particularly preferably 0.5 parts by weight to 15 parts by weight, and most preferably 0.5 parts by weight to 10 parts by weight, relative to the solid content (100 parts by weight) of the (meth)acrylic resin (1).

[0094] The acrylic adhesive composition (1) may contain any other suitable components as long as they do not impair the effects of the present invention. Examples of such other components include polymer components other than the (meth)acrylic resin (1), crosslinking accelerators, crosslinking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), anti-aging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, ultraviolet 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.

[0095] [A-2-1-1. Preferred Embodiment 1 of (meth)acrylic resin (1)] A preferred embodiment of the (meth)acrylic resin (1) is, in terms of being able to better express the effects of the present invention, a (meth)acrylic resin (A) formed by polymerization from a composition (A) comprising (a) an alkyl (meth)acrylate ester having 1 to 12 carbon atoms in the alkyl group of the alkyl ester portion, and (b) at least one selected from the group consisting of (meth)acrylic acid esters having an OH group and (meth)acrylic acid.

[0096] The (meth)acrylic resin (A) is preferably a (meth)acrylic resin (A) formed by polymerization from composition (A), wherein (component a) is an alkyl (meth)acrylate ester in which the alkyl group of the alkyl ester portion has 1 to 12 carbon atoms, and (component b) is a (meth)acrylic acid ester without an OH group. More preferably, the (meth)acrylic resin (A) is formed by polymerization from composition (A), wherein (component a) is an alkyl (meth)acrylate ester in which the alkyl group of the alkyl ester portion has 1 to 8 carbon atoms, and (component b) is a (meth)acrylic resin (A) formed by polymerization from composition (A), wherein (component a) is an alkyl (meth)acrylate ester in which the alkyl group of the alkyl ester portion has 1 to 6 carbon atoms, and (component b) is a (meth)acrylic resin (A) formed by polymerization from composition (A).

[0097] (Component a) and (Component b) may each be independent of one type or two or more types.

[0098] Examples of alkyl (meth)acrylate (component a) having 1 to 12 carbon atoms in the alkyl group of the alkyl ester portion include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, 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 preferred in terms of being able to better exhibit the effects of the present invention, and more preferably methyl acrylate, ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate.

[0099] At least one component (b) selected from the group consisting of (meth)acrylic acid esters and (meth)acrylic acid having an OH group, include, for example, (meth)acrylic acid esters having an OH group such as hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, and hydroxybutyl (meth)acrylate, and (meth)acrylic acid. Among these, hydroxyethyl (meth)acrylate and (meth)acrylic acid are preferred in terms of being able to better express the effects of the present invention, and more preferably hydroxyethyl acrylate and acrylic acid.

[0100] Composition (A) may contain copolymerizable monomers other than components (a) and (b). The copolymerizable monomer may be one type or two or more types.Examples of such copolymerizable monomers include (meth)acrylate alkyl esters in which the alkyl group of the alkyl ester portion has 1 to 3 carbon atoms; carboxyl group-containing monomers such as itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, and their acid anhydrides (e.g., acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride) (excluding (meth)acrylic acid); (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; amino group-containing monomers such as aminoethyl(meth)acrylate, dimethylaminoethyl(meth)acrylate, and t-butylaminoethyl(meth)acrylate; 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, (meth)acryloylmorpholine, N-vinylpiperidone, N-vinyl Heterocyclic vinyl monomers such as piperazine, N-vinylpyrrole, N-vinylimidazole, vinylpyridine, vinylpyrimidine, and vinyloxazole; sulfonic acid group-containing monomers such as sodium vinylsulfonate; phosphate group-containing monomers such as 2-hydroxyethyl acryloyl phosphate; imide group-containing monomers such as cyclohexyl maleimide and isopropyl maleimide; isocyanate group-containing monomers such as 2-methacryloyloxyethyl isocyanate; cyclopentyl (meth)acrylate and cyclohexyl (meth)acrylate. Examples include (meth)acrylic acid esters having alicyclic hydrocarbon groups such as 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; aromatic vinyl compounds such as styrene and vinyltoluene; olefins and dienes such as ethylene, butadiene, isoprene, and isobutylene; vinyl ethers such as vinyl alkyl ethers; and vinyl chloride.

[0101] Polyfunctional monomers can also be used as copolymerizable monomers. A polyfunctional monomer is a monomer having two or more ethylenically unsaturated groups in one molecule. Any suitable ethylenically unsaturated group can be used as the ethylenically unsaturated group, as long as it does not impair the effects of the present invention. Examples of such ethylenically unsaturated groups include radical 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, 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, and urethane acrylate. Such polyfunctional monomers may be present individually or in combination of two or more types.

[0102] As copolymerizable monomers, alkoxyalkyl (meth)acrylates may also be used. Examples of alkoxyalkyl (meth)acrylates include 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, 3-methoxypropyl (meth)acrylate, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, and 4-ethoxybutyl (meth)acrylate. There may be only one alkoxyalkyl (meth)acrylate or two or more.

[0103] The content of the alkyl (meth)acrylate (component a) in which the alkyl group of the alkyl ester portion has 1 to 12 carbon atoms is preferably 30% by weight or more, more preferably 35% to 99% by weight, even more preferably 40% to 98% by weight, and particularly preferably 50% to 95% by weight, relative to the total amount (100% by weight) of the monomer components constituting the (meth)acrylic resin (A), in order to better express the effects of the present invention.

[0104] In order to better express the effects of the present invention, the content of alkyl (meth)acrylate in which the alkyl group of the alkyl group of the alkyl ester portion has 2 to 12 carbon atoms (preferably 2 to 10, more preferably 2 to 8, and even more preferably 2 to 6 carbon atoms) in the total amount (100% by weight) of alkyl (meth)acrylate (component a) in which the alkyl group of the alkyl ester portion has 1 to 12 carbon atoms is preferably 30% by weight or more, more preferably 35% to 100% by weight, even more preferably 40% to 100% by weight, and particularly preferably 45% to 100% by weight.

[0105] 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 preferably 1% by weight or more, more preferably 1% to 30% by weight, even more preferably 2% to 20% by weight, and particularly preferably 3% to 15% by weight, relative to the total amount (100% by weight) of monomer components constituting the (meth)acrylic resin (A), in order to better express the effects of the present invention.

[0106] Composition (A) may contain any other suitable components, as long as they do not impair the effects of the present invention. Examples of such other components include polymerization initiators, chain transfer agents, and solvents. The content of these other components may be any suitable amount, as long as they do not impair the effects of the present invention.

[0107] Depending on the type of polymerization reaction, the polymerization initiator may be a thermal polymerization initiator or a photopolymerization initiator (photoinitiator). There may be only one polymerization initiator or two or more.

[0108] A thermal polymerization initiator can preferably be used when obtaining a (meth)acrylic resin (A) by solution polymerization. Examples of such thermal polymerization initiators include azo polymerization initiators, peroxide polymerization initiators (e.g., dibenzoyl peroxide, tert-butyl permaleate, etc.), and redox polymerization initiators. Among these thermal polymerization initiators, the azo polymerization initiator disclosed in Japanese Patent Application Publication No. 2002-69411 is particularly preferred. Such azo polymerization initiators are preferred because their decomposition products are less likely to remain in the (meth)acrylic resin (A) as a cause of outgassing during heating. Examples of azo polymerization initiators include 2,2'-azobisisobutyronitrile (sometimes referred to as AIBN), 2,2'-azobis-2-methylbutyronitrile (sometimes referred to as AMBN), 2,2'-azobis(2-methylpropionic acid)dimethyl, and 4,4'-azobis-4-cyanovaleric acid.

[0109] Photopolymerization initiators can preferably be used when obtaining (meth)acrylic resin (A) 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, 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.

[0110] 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-diphenylethane-1-one, and anisole methyl ether. Examples of acetophenone-based photopolymerization initiators include 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenyl ketone, 4-phenoxydichloroacetophenone, and 4-(t-butyl)dichloroacetophenone. Examples of α-ketol-based photopolymerization initiators include 2-methyl-2-hydroxypropiophenone and 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropan-1-one. Examples of aromatic sulfonyl chloride-based photopolymerization initiators include 2-naphthalenesulfonyl chloride. Examples of photoactive oxime-based photopolymerization initiators include 1-phenyl-1,1-propanedione-2-(o-ethoxycarbonyl)-oxime. Examples of benzoin-based photopolymerization initiators include 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, and α-hydroxycyclohexylphenyl ketone. Examples of ketal-based photopolymerization initiators include benzyldimethylketal. Examples of thioxanthone-based photopolymerization initiators include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, and dodecylthioxanthone.

[0111] [A-2-1-2. Preferred Embodiment 2 of (meth)acrylic resin (1)] A preferred embodiment 2 of the (meth)acrylic resin (1) is, in terms of being able to better express the effects of the present invention, a (meth)acrylic resin (B) formed by polymerization from a composition (B) containing a (meth)acrylic acid ester having a cyclic structure in the molecule as a monomer component, and more preferably a (meth)acrylic resin (B) formed by polymerization from a composition (B) containing a (meth)acrylic acid ester having a cyclic structure in the molecule and an alkyl (meth)acrylate having a linear or branched alkyl group as monomer components.

[0112] The cyclic structure (ring) of a (meth)acrylic acid ester having a cyclic structure within the molecule (hereinafter sometimes referred to as "ring-containing (meth)acrylic acid ester") may be either an aromatic ring or a non-aromatic ring. Examples of aromatic rings include aromatic carbocyclic rings (e.g., monocyclic carbocyclic rings such as benzene rings, or fused carbocyclic rings such as naphthalene rings), and various aromatic heterocyclic rings. Examples of non-aromatic rings include non-aromatic aliphatic rings (non-aromatic alicyclic rings) (e.g., cycloalkane rings such as cyclopentane, cyclohexane, cycloheptane, and cyclooctane rings; cycloalkene rings such as cyclohexene rings; etc.), non-aromatic bridged rings (e.g., bicyclic hydrocarbon rings such as pinane, pinene, bornane, norbornane, norbornene; aliphatic hydrocarbon rings with three or more rings such as adamantane (bridged hydrocarbon rings)), and non-aromatic heterocycles (e.g., epoxy rings, oxolane rings, oxetane rings, etc.).

[0113] Examples of aliphatic hydrocarbon rings with three or more rings (cross-linked hydrocarbon rings with three or more rings) include dicyclopentanyl group, dicyclopentenyl group, adamantyl group, tricyclopentanyl group, and tricyclopentenyl group.

[0114] In other words, ring-containing (meth)acrylic acid esters include, for example, cycloalkyl (meth)acrylic acid esters such as cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, cycloheptyl (meth)acrylate, and cyclooctyl (meth)acrylate; (meth)acrylic acid esters having a bicyclic aliphatic hydrocarbon ring such as isobornyl (meth)acrylate; dicyclopentanyl (meth)acrylate, dicyclopentanyloxyethyl (meth)acrylate, tricyclopentanyl (meth)acrylate, 1-adamantine Examples include (meth)acrylic acid esters having three or more aliphatic hydrocarbon rings, such as 1-(meth)acrylate, 2-methyl-2-adamantyl(meth)acrylate, and 2-ethyl-2-adamantyl(meth)acrylate; and (meth)acrylic acid esters having aromatic rings, such as aryl (meth)acrylates like phenyl (meth)acrylate, aryloxyalkyl (meth)acrylates like phenoxyethyl (meth)acrylate, and arylalkyl (meth)acrylates like benzyl (meth)acrylate. Among these, the ring-containing (meth)acrylic acid esters are preferably non-aromatic ring-containing (meth)acrylic acid esters, more preferably cyclohexyl acrylate (CHA), cyclohexyl methacrylate (CHMA), dicyclopentanyl acrylate (DCPA), and dicyclopentanyl methacrylate (DCPMA), and even more preferably dicyclopentanyl acrylate (DCPA) and dicyclopentanyl methacrylate (DCPMA).

[0115] The ring-containing (meth)acrylic acid ester may be one type or two or more types.

[0116] The content of the ring-containing (meth)acrylic acid ester is preferably 10% by weight or more, more preferably 20% to 90% by weight, even more preferably 30% to 80% by weight, and particularly preferably 40% to 70% by weight, relative to the total amount (100% by weight) of the monomer components constituting the (meth)acrylic resin (B), in order to better express the effects of the present invention.

[0117] Examples of alkyl (meth)acrylate esters having linear or branched alkyl groups include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, isopentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isooctyl (meth)acrylate. Examples of alkyl esters of (meth)acrylates having 1 to 20 carbon atoms in the alkyl group include nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, octadecyl (meth)acrylate, nonadecyl (meth)acrylate, eicosyl (meth)acrylate, and lauryl (meth)acrylate. Among these, methyl methacrylate (MMA) and lauryl (meth)acrylate are preferred as alkyl esters of (meth)acrylates having a linear or branched alkyl group.

[0118] The alkyl (meth)acrylate having a linear or branched alkyl group may be one or more.

[0119] The content of alkyl (meth)acrylate ester having a linear or branched alkyl group is preferably 10% by weight or more, more preferably 20% to 90% by weight, even more preferably 25% to 80% by weight, particularly preferably 30% to 70% by weight, and most preferably 30% to 60% by weight, relative to the total amount (100% by weight) of monomer components constituting the (meth)acrylic resin (B), in order to better express the effects of the present invention.

[0120] Composition (B) may contain copolymerizable monomers other than ring-containing (meth)acrylate esters and (meth)acrylate alkyl esters having linear or branched alkyl groups. There may be only one copolymerizable monomer or two or more. Examples of such copolymerizable monomers include (meth)acrylate alkoxyalkyl esters such as 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, 3-methoxypropyl (meth)acrylate, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, and 4-ethoxybutyl (meth)acrylate; hydroxyl group-containing monomers such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, vinyl alcohol, and allyl alcohol; and (meth)acrylamide, N, Examples include amide group-containing monomers such as N-dimethyl(meth)acrylamide, N-methylol(meth)acrylamide, N-methoxymethyl(meth)acrylamide, N-butoxymethyl(meth)acrylamide, and N-hydroxyethyl(meth)acrylamide; amino group-containing monomers such as aminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, and t-butylaminoethyl (meth)acrylate; cyano group-containing monomers such as acrylonitrile and methacrylonitrile; sulfonic acid group-containing monomers such as sodium vinyl sulfonate; phosphate group-containing monomers such as 2-hydroxyethyl acryloyl phosphate; isocyanate group-containing monomers such as 2-methacryloyloxyethyl isocyanate; and imide group-containing monomers such as cyclohexylmaleimide and isopropylmaleimide.

[0121] Polyfunctional monomers can also be used as copolymerizable monomers. A polyfunctional monomer is a monomer having two or more ethylenically unsaturated groups in one molecule. Any suitable ethylenically unsaturated group can be used as the ethylenically unsaturated group, as long as it does not impair the effects of the present invention. Examples of such ethylenically unsaturated groups include radical 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, 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, and urethane acrylate. Such polyfunctional monomers may be present individually or in combination of two or more types.

[0122] Composition (B) may contain any other suitable components, as long as they do not impair the effects of the present invention. Examples of such other components include polymerization initiators, chain transfer agents, and solvents. The content of these other components may be any suitable amount, as long as it does not impair the effects of the present invention.

[0123] Depending on the type of polymerization reaction, the polymerization initiator may be a thermal polymerization initiator or a photopolymerization initiator (photoinitiator). There may be only one polymerization initiator or two or more.

[0124] As for the thermal polymerization initiator and the photopolymerization initiator (photoinitiator), the description in section [A-2-1-1. Preferred Embodiment 1 of (meth)acrylic resin (1)] may be used.

[0125] <A-2-2. Urethane-based adhesive (1)> As the urethane-based adhesive (1), any suitable urethane-based adhesive can be adopted, for example, a known urethane-based adhesive described in Japanese Patent Application Laid-Open No. 2017-039859, etc., as long as the effects of the present invention are not impaired. Such a urethane-based adhesive (1) is, for example, a urethane-based adhesive formed from a urethane-based adhesive composition, and the urethane-based adhesive composition contains at least one selected from the group consisting of a urethane prepolymer and a polyol and a crosslinking agent. The urethane-based adhesive (1) may be only one kind or two or more kinds. The urethane-based adhesive (1) may contain any suitable components as long as the effects of the present invention are not impaired.

[0126] <A-2-3. Rubber-based adhesive (1)> As the rubber-based adhesive (1), any suitable rubber-based adhesive can be adopted, for example, a known rubber-based adhesive described in Japanese Patent Application Laid-Open No. 2015-074771, etc., as long as the effects of the present invention are not impaired. The rubber-based adhesive (1) may be only one kind or two or more kinds. The rubber-based adhesive (1) may contain any suitable components as long as the effects of the present invention are not impaired.

[0127] <A-2-4. Silicone-based adhesive (1)> As the silicone-based adhesive (1), any suitable silicone-based adhesive can be adopted, for example, a known silicone-based adhesive described in Japanese Patent Application Laid-Open No. 2014-047280, etc., as long as the effects of the present invention are not impaired. The silicone-based adhesive (1) may be only one kind or two or more kinds. The silicone-based adhesive (1) may contain any suitable components as long as the effects of the present invention are not impaired.

[0128] ≪A-3. Substrate film (1)≫ The thickness of the base film (1) can be any appropriate thickness depending on the purpose, as long as it does not impair the effects of the present invention. Such a thickness is preferably 20 μm to 500 μm, more preferably 20 μm to 300 μm, even more preferably 20 μm to 200 μm, particularly preferably 20 μm to 100 μm, and most preferably 20 μm to 80 μm, in order to better express the effects of the present invention.

[0129] The base film (1) includes a resin base film (1a).

[0130] For the resin base film (1a), the description of the resin base film (IIIa) in section A-1. Release liner (III) can be used as a reference.

[0131] The base film (1) may have a conductive layer (1b). The conductive layer (1b) may be placed, for example, between the adhesive layer (1) and the resin base film (1a).

[0132] The conductive layer (1b) may consist of only one layer or two or more layers.

[0133] The conductive layer (1b) can be provided by forming it on any suitable substrate. Preferably, such a substrate is a resin substrate film (1a).

[0134] The conductive layer (1b) is formed on any suitable substrate (preferably a resin substrate film (1a)) by any suitable thin film formation method, such as vacuum deposition, sputtering, ion plating, spray pyrolysis, chemical plating, electroplating, or a combination thereof. Among these thin film formation methods, vacuum deposition and sputtering are preferred in terms of conductive layer formation speed, large-area film formation capability, and productivity.

[0135] Materials used to form the conductive layer (1b) include, for example, metallic materials consisting of gold, silver, platinum, palladium, copper, aluminum, nickel, chromium, titanium, iron, cobalt, tin, and alloys thereof; metal oxide materials consisting of indium oxide, tin oxide, titanium oxide, cadmium oxide, and mixtures thereof; and other metallic compounds such as copper iodide.

[0136] The thickness of the conductive layer (1b) can be any appropriate thickness depending on the purpose, as long as it does not impair the effects of the present invention. For example, when formed from a metallic material, the preferred thickness is 30 Å to 600 Å, and when formed from a metal oxide material, the preferred thickness is 80 Å to 5000 Å.

[0137] The surface resistance of the conductive layer (1b) is preferably 1.0 × 10⁻⁶. 10 It is less than or equal to Ω / □, and more preferably 1.0 × 10 9 It is less than or equal to Ω / □, and more preferably 1.0 × 10 8 It is less than or equal to Ω / □, and particularly preferably 1.0 × 10⁻⁶. 7 It is less than or equal to Ω / □.

[0138] When forming a conductive layer on any suitable substrate (preferably a resin substrate film (1a)), the adhesion between the conductive layer and the substrate (preferably a resin substrate film (1a)) can be improved by applying any suitable pretreatment to the surface of the substrate (preferably a resin substrate film (1a)), such as corona discharge treatment, ultraviolet irradiation treatment, plasma treatment, sputter etching treatment, or undercoat treatment.

[0139] The base film (1) may have an antistatic layer (1c). The antistatic layer (1c) may typically be placed between the adhesive layer (1) and the resin base film (1a) and / or between the resin base film (1a) and the adhesive layer (2).

[0140] The antistatic layer (1c) may consist of only one layer or two or more layers.

[0141] The thickness of the antistatic layer (1c) can be any appropriate thickness depending on the purpose, as long as it 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.

[0142] The surface resistance of the antistatic layer (1c) is preferably 1.0 × 10⁻⁶. 10 It is less than or equal to Ω / □, and more preferably 8.0 × 10 9 It is less than or equal to Ω / □, and more preferably 5.0 × 10 9 It is less than or equal to Ω / □, and particularly preferably 1.0 × 10⁻⁶. 9 It is less than or equal to Ω / □.

[0143] As the antistatic layer (1c), any suitable antistatic layer can be used, as long as it is a layer capable of providing an antistatic effect, and does not impair the effects of the present invention. For such an antistatic layer (1c), refer to the description of the antistatic layer (IIIc) in section A-1. Release Liner (III).

[0144] ≪A-4. Adhesive layer (2)≫ The adhesive layer (2) can be any suitable adhesive layer, as long as it does not impair the effects of the present invention. The adhesive layer (2) may consist of only one layer or two or more layers.

[0145] The thickness of the adhesive layer (2) is preferably 0.5 μm to 150 μm, more preferably 1 μm to 100 μm, even more preferably 2 μm to 80 μm, particularly preferably 3 μm to 50 μm, and most preferably 5 μm to 24 μm, in order to better exhibit the effects of the present invention.

[0146] The adhesive layer (2) can be formed by any suitable method. Such methods include, for example, applying an adhesive composition (preferably an acrylic adhesive composition (2)) that forms the adhesive constituting the adhesive layer (2) onto any suitable substrate (e.g., a substrate film (2)), heating and drying as necessary, and curing as necessary to form the adhesive layer on the substrate. Examples of such coating methods include methods such as 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, etc.

[0147] The adhesive layer (2) may contain other components (2). The other components (2) may be only one type or two or more types. As the other components (2), any suitable other components can be adopted as long as the effects of the present invention are not impaired. Examples of such other components (1) include, for example, other polymer components, crosslinking accelerators, crosslinking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), anti-aging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foil-like substances, ultraviolet 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, etc.

[0148] Typical examples of the other components (2) include conductive components. The conductive components may be only one type or two or more types. As the conductive components, any suitable conductive components can be adopted as long as the effects of the present invention are not impaired. Examples of such conductive components include, for example, ionic liquids, ion-conductive polymers, ion-conductive fillers, electrically conductive polymers, etc.

[0149] <A-4-1. Acrylic Adhesive> The adhesive layer (2) is preferably composed of an acrylic adhesive (2).

[0150] The acrylic adhesive (2) is formed from an acrylic adhesive composition (2).

[0151] The acrylic adhesive composition (2) preferably contains an acrylic polymer (C) in terms of more effectively exhibiting the effects of the present invention.

[0152] The acrylic polymer (C) can be a so-called base polymer in the field of acrylic adhesives. The acrylic polymer may be only one kind or two or more kinds.

[0153] The content ratio of the acrylic polymer (C) in the acrylic adhesive composition (2) is preferably 60% to 99.9% by weight, more preferably 65% to 99.9% by weight, still more preferably 70% to 99.9% by weight, particularly preferably 75% to 99.9% by weight, and most preferably 80% to 99.9% by weight in terms of solid content conversion.

[0154] Any suitable acrylic polymer can be adopted as the acrylic polymer (C) as long as the effects of the present invention are not impaired.

[0155] 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, still more preferably 400,000 to 1,800,000, and particularly preferably 500,000 to 1,500,000 in terms of more effectively exhibiting the effects of the present invention.

[0156] The acrylic adhesive composition (2) may contain a crosslinking agent. By using a crosslinking agent, the cohesive force of the acrylic adhesive can be improved, and the effects of the present invention can be more effectively exhibited. The crosslinking agent may be only one kind or two or more kinds.

[0157] As the crosslinking agent, the description in the section of <A-2-1. Acrylic Adhesive (1)> can be incorporated by reference.

[0158] The amount of crosslinking agent in the acrylic adhesive composition (2) can be any appropriate amount, as long as it does not impair the effects of the present invention. For example, in order to better express the effects of the present invention, the amount is preferably 0.05 to 20 parts by weight, more preferably 0.1 to 18 parts by weight, even more preferably 0.5 to 15 parts by weight, and particularly preferably 0.5 to 10 parts by weight, relative to the solid content (100 parts by weight) of the acrylic polymer (C).

[0159] The acrylic adhesive composition (2) may contain any other suitable components as long as they do not impair the effects of the present invention. Examples of such other components include polymer components other than acrylic polymers, crosslinking accelerators, crosslinking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), anti-aging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, ultraviolet 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.

[0160] The acrylic polymer (C) is preferably an acrylic polymer (C) formed by polymerization from a composition (C) which, in terms of being able to better express the effects of the present invention, comprises (a) an alkyl (meth)acrylate ester having 4 to 12 carbon atoms in the alkyl group of the alkyl ester moiety, and (b) at least one selected from the group consisting of (meth)acrylate esters having an OH group and (meth)acrylic acid. Each of (a) and (b) may be one or two or more, independently of each other.

[0161] Examples of alkyl (meth)acrylate esters (component a) having 4 to 12 carbon atoms in the alkyl group of the alkyl ester portion include n-butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, and dodecyl (meth)acrylate. Among these, n-butyl (meth)acrylate and 2-ethylhexyl (meth)acrylate are preferred in terms of being able to better exhibit the effects of the present invention, and more preferably n-butyl acrylate and 2-ethylhexyl acrylate.

[0162] At least one component (b) selected from the group consisting of (meth)acrylic acid esters and (meth)acrylic acid having an OH group, include, for example, (meth)acrylic acid esters having an OH group such as hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, and hydroxybutyl (meth)acrylate, and (meth)acrylic acid. Among these, hydroxyethyl (meth)acrylate and (meth)acrylic acid are preferred in terms of being able to better express the effects of the present invention, and more preferably hydroxyethyl acrylate and acrylic acid.

[0163] Composition (C) may contain copolymerizable monomers other than components (a) and (b). The copolymerizable monomer may be one type or two or more types.Such copolymerizable monomers include, for example, carboxyl group-containing monomers such as itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, and their acid anhydrides (e.g., acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride) (excluding (meth)acrylic acid); (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N-methylol(meth)acrylamide, N-methoxymethyl(meth)acrylamide, N-butoxymethyl(meth)acrylamide, N-hydroxyethyl(meth) Amylamide-containing monomers such as acrylamide; amino group-containing monomers such as (meth)aminoethyl acrylate, (meth)dimethylaminoethyl acrylate, and (meth)butylaminoethyl acrylate; epoxy group-containing monomers such as (meth)glycidyl acrylate and (meth)methylglycidyl acrylate; cyano group-containing monomers such as acrylonitrile and methacrylonitrile; N-vinyl-2-pyrrolidone, (meth)acryloylmorpholine, N-vinylpiperidone, N-vinylpiperazine, N-vinylpyrrole, N-vinyl Examples include heterocyclic vinyl monomers such as midazole, vinylpyridine, vinylpyrimidine, and vinyloxazole; sulfonic acid group-containing monomers such as sodium vinylsulfonate; phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate; imide group-containing monomers such as cyclohexyl maleimide and isopropyl maleimide; 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; aromatic vinyl compounds such as styrene and vinyltoluene; olefins and dienes such as ethylene, butadiene, isoprene, and isobutylene; vinyl ethers such as vinyl alkyl ethers; and vinyl chloride.

[0164] Polyfunctional monomers can also be used as copolymerizable monomers. A polyfunctional monomer is a monomer having two or more ethylenically unsaturated groups in one molecule. Any suitable ethylenically unsaturated group can be used as the ethylenically unsaturated group, as long as it does not impair the effects of the present invention. Examples of such ethylenically unsaturated groups include radical 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, 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, and urethane acrylate. Such polyfunctional monomers may be present individually or in combination of two or more types.

[0165] As copolymerizable monomers, alkoxyalkyl (meth)acrylates may also be used. Examples of alkoxyalkyl (meth)acrylates include 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, 3-methoxypropyl (meth)acrylate, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, and 4-ethoxybutyl (meth)acrylate. There may be only one alkoxyalkyl (meth)acrylate or two or more.

[0166] The content of the alkyl (meth)acrylate ester (component a) in which the number of carbon atoms of the alkyl group in the alkyl ester moiety is 4 to 12 is preferably 30% by weight or more, more preferably 50% to 99% by weight, still more preferably 70% to 98% by weight, and particularly preferably 90% to 98% by weight with respect to the total amount (100% by weight) of the monomer components constituting the acrylic polymer (C) in terms of more effectively expressing the effects of the present invention.

[0167] The content of at least one selected from the group consisting of (meth)acrylate ester having an OH group and (meth)acrylic acid (component b) is preferably 1% by weight or more, more preferably 1% to 30% by weight, still more preferably 2% to 20% by weight, particularly preferably 3% to 10% by weight, and most preferably 3% to 6% by weight with respect to the total amount (100% by weight) of the monomer components constituting the acrylic polymer (C) in terms of more effectively expressing the effects of the present invention.

[0168] The composition (C) may contain any appropriate other components as long as the effects of the present invention are not impaired. Examples of such other components include polymerization initiators, chain transfer agents, solvents, and the like. The content of these other components may be any appropriate content as long as the effects of the present invention are not impaired.

[0169] The polymerization initiator may be a thermal polymerization initiator, a photopolymerization initiator (photoinitiator), etc., depending on the type of the polymerization reaction. The polymerization initiator may be only one type or two or more types.

[0170] The description in the section of [1-2-1-1. Preferred embodiments of acrylic polymers (1)] can be incorporated as the thermal polymerization initiator and the photopolymerization initiator (photoinitiator).

[0171] <A-4-2. Conductive component> The adhesive layer (2) may contain a conductive component. The conductive component may be one type or two or more types. Any suitable conductive component can be used as the conductive component, as long as it does not impair the effects of the present invention. Examples of such conductive components include ionic liquids, ion-conducting polymers, ion-conducting fillers, and electrical conductive polymers.

[0172] ≪A-5. Base Film (2)≫ The thickness of the base film (2) is preferably 10 μm to 300 μm, more preferably 20 μm to 200 μm, even more preferably 30 μm to 150 μm, particularly preferably 35 μm to 100 μm, and most preferably 35 μm to 80 μm, in order to better exhibit the effects of the present invention.

[0173] The base film (2) includes a resin base film (2a).

[0174] For the resin base film (2a), the description of the resin base film (IIIa) in section A-1. Release liner (III) can be used as reference.

[0175] The base film (2) may have a conductive layer (2b). The conductive layer (2b) may be placed between the adhesive layer (2) and the resin base film (2a).

[0176] The conductive layer (2b) may consist of only one layer or two or more layers.

[0177] For the conductive layer (2b), the explanation for conductive layer (1b) in section A-3. Substrate film (1) can be used.

[0178] The base film (2) may have an antistatic layer (2c). The antistatic layer (2c) may be located between the adhesive layer (2) and the resin base film (2a) and / or on the opposite side of the adhesive layer (2) of the resin base film (2a).

[0179] The antistatic layer (2c) may consist of only one layer or two or more layers.

[0180] The thickness of the antistatic layer (2c) can be any appropriate thickness depending on the purpose, as long as it 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.

[0181] For the antistatic layer (2c), the explanation for the antistatic layer (1c) in section A-3. Base film (1) can be used.

[0182] The antistatic layer (2c) may contain any other suitable components, as long as they do not impair the effects of the present invention.

[0183] ≪≪B. Method for manufacturing adhesive tape for optical components≫≫ The adhesive tape for optical components according to the embodiment of the present invention can be manufactured by any suitable method, as long as the effects of the present invention are not impaired.

[0184] As a representative example of a method for manufacturing an adhesive tape for optical components according to an embodiment of the present invention, the adhesive tape for optical components according to an embodiment of the present invention has a release liner (III), an adhesive layer (1), a base film (1), an adhesive layer (2), and a base film (2) in this order, and is a laminate where the area with the fewest layers is 3 or more and the area with the most layers is 5 or more, the adhesive layer (1) and the base film (1) are components of an adhesive tape for protecting optical components (I), the adhesive layer (2) and the base film (2) are components of a retaining tape (II), the outermost surface of the adhesive tape for protecting optical components (I) opposite to the adhesive layer (1) and the adhesive layer (2) are directly laminated, the release liner (III) is directly laminated to the exposed surface of the adhesive layer (1), and two or more adhesive tapes for protecting optical components (I) are laminated on one retaining tape (II) in an arrangement with gaps between them.

[0185] One embodiment of the method for manufacturing adhesive tape for optical components according to an embodiment of the present invention involves manufacturing a laminate (X) consisting of these components, having a release liner (III), an adhesive layer (1), and a base film (1) in that order (i.e., a laminate of a release liner (III) and an adhesive tape for protecting optical components (I)), and a retaining tape (II) consisting of these components, having an adhesive layer (2) and a base film (2) in that order. Then, the surface of the base film (1) of the laminate (X) and the surface of the adhesive layer (2) of the retaining tape (II) are attached to one retaining tape (II) such that two or more adhesive tapes for protecting optical components (I) are arranged with gaps between them.

[0186] The laminate (X) can be manufactured, for example, by applying an adhesive composition (at least one selected from the group consisting of acrylic adhesive composition (1), urethane adhesive composition (1), rubber adhesive composition (1), and silicone adhesive composition (1)) that forms the adhesive constituting the adhesive layer (1) onto a base film (1), heating and drying as necessary, and curing as necessary to form the adhesive layer (1) on the base film (1), and then attaching a release liner (III) (or the side with a release layer (IIIb) if one is present) to the side of the adhesive layer (1) opposite to the base film (1).

[0187] The retaining tape (II) is formed by, for example, applying an adhesive composition (preferably at least one selected from the group consisting of acrylic adhesives (2) and urethane adhesives (2)) onto a base film (2), heating and drying as necessary, and curing as necessary to form the adhesive layer (2) on the base film (2). Until the laminate (X) and the retaining tape (II) are attached, any suitable separator (for example, a film similar to the release liner (III)) may be attached to protect the exposed surface of the adhesive layer (2).

[0188] In the adhesive tape for optical components according to an embodiment of the present invention, at least one of the corners formed on the opposing sides of two adjacent adhesive tapes (I) for protecting optical components separated by a gap is a chamfered portion, and the chamfered portion is preferably at least one selected from a C-face and an R-face. Any suitable method can be used to form the chamfered portion, as long as it does not impair the effects of the present invention. For example, methods for forming the chamfered portion of a C-face and a chamfered portion of an R-face include cutting with a blade using a press machine, laser cutting, and cutting with an end mill.

[0189] <<<C. How to use adhesive tape for optical components>>> The adhesive tape for optical components according to the embodiments of the present invention can be used in any suitable way, as long as the effects of the present invention are not impaired. Typical examples of such uses are listed below.

[0190] (1) First, the release liner (III) is peeled off from the adhesive tape for optical components according to the embodiment of the present invention. In this case, in the adhesive tape for optical components according to the embodiment of the present invention, at least one of the corners formed on the opposing sides of two adjacent adhesive tapes (I) for protecting optical components separated by a gap is a chamfered portion. Therefore, when peeling off the release liner (III), two or more adhesive tapes (I) for protecting optical components, which are laminated on a single retaining tape (II) with a gap between them, are well held by the retaining tape (II) and can be reliably peeled off at the interface between the release liner (III) and the adhesive tape (I) for protecting optical components. This is because, when the release liner (III) is peeled off, the force that tries to separate the release liner (III) from the adhesive tape (I) and the force that tries to separate the adhesive tape (I) from the retaining tape (II) act in an appropriate balance, thereby suppressing the occurrence of peeling abnormalities that were common in conventional methods.

[0191] (2) Next, with two or more adhesive tapes for protecting optical components held by one retaining tape, the exposed adhesive layer (1) is attached to the substrate while aligning it. This results in a laminate in which the adhesive tape for protecting optical components (I) and the retaining tape (II) are laminated in that order on the substrate.

[0192] (3) Finally, the retaining tape (II) is peeled off from the laminate obtained in (2) above, and a state is obtained in which the adhesive tape (I) for protecting the optical component is attached to the adherend. [Examples]

[0193] The present invention will be specifically described below with reference to examples, but the present invention is not limited in any way to these examples. The test and evaluation methods in the examples are as follows. When "parts" is written, it means "parts by weight" unless otherwise specified, and when "%" is written, it means "percent by weight" unless otherwise specified.

[0194] <Release Liner Peeling Evaluation> The release liner peel-off evaluation using the adhesive tape for optical components (1) obtained in Example 1 (including adhesive tape for protecting optical components with a release liner (1A), adhesive tape for protecting optical components with a release liner (1B), and retaining tape) as an example is as follows. The same procedure was performed for other examples and comparative examples. An adhesive tape for optical components (1) was positioned so that the holding tape side was adsorbed onto the suction stage, and one of the corners of the release liner on the corners 2a and 2b of the adhesive tape for protecting optical components (1B) with a release liner was gripped by a chucking device. A peeling roller was attached to the chucking device, and the peeling roller was fixed to the surface of the release liner. Then, the chucking device was moved in the in-plane direction of the suction stage at a speed of 10 mm / min in the diagonal direction of the gripped corner. At that time, the chucking device was moved while rising at an angle of 45 degrees with respect to the plane of the suction stage and at an angle of 30° perpendicular to the suction stage. In other words, the angle between the adhesive tape for optical components (1) and the peeling direction in a plan view was 45°, and the angle between the planar direction and the peeling direction in a side view was 30°. In this way, the release liner was peeled off from the adhesive tapes for protecting optical components (1A) and (1B). If the adhesive tapes (1A) and (1B) for protecting the optical components could be peeled off without following the release liner, the peeling result was considered successful. This test was performed on 10 samples, and the results were determined as follows. A: 9 or more out of 10 passed the peeling test. B: 5 or more out of 10 pieces pass the test due to peeling. C: Less than 5 out of 10 pieces passed due to peeling.

[0195] <Measurement of peeling force A> The sample was cut into strips 25 mm wide and 150 mm long to be used as evaluation samples. Under conditions of 23°C and 50% RH humidity, the strips were peeled using a universal tensile testing machine (Minebea Co., Ltd., product name: TCM-1kNB) at a peeling angle of 180 degrees and a tensile speed of 300 mm / min, and the peeling force A was measured.

[0196] <Measurement of Adhesion Strength B> The sample was cut to a width of 25 mm and a length of 150 mm to prepare the evaluation sample. Under an atmosphere of 23°C and 50% RH humidity, the adhesive layer surface of the evaluation sample was attached to the surface of the substrate layer described in each example and comparative example by rolling a 2.0 kg roller back and forth once. After curing for 30 minutes under an atmosphere of 23°C and 50% RH humidity, the adhesive strength B was measured by peeling the sample using a universal tensile testing machine (Minebea Co., Ltd., product name: TCM-1kNB) at a peeling angle of 180 degrees and a tensile speed of 300 mm / min.

[0197] <Measurement of Storage Modulus G'> The storage modulus G' corresponds to the portion of elastic energy stored when a material deforms, and is an indicator of its degree of hardness. In each example and comparative example, only the adhesive layer was removed from the adhesive tape for protecting optical components formed on the release liner, laminated to a thickness of approximately 1 mm, and punched out to a diameter of φ9 mm to produce cylindrical pellets which were used as measurement samples. A dynamic viscoelasticity measuring device (ARES, manufactured by Rheometrics) was used to obtain measurement samples, which were then fixed to a φ8 mm parallel plate jig, and the storage modulus G' was calculated. The measurement conditions were as follows. Measurement: Shear mode Temperature range: -60℃ to 210℃ Heating rate: 5°C / min Frequency: 1Hz

[0198] [Manufacturing Example 1] (Preparation of oligomer A) 60 parts by weight of dicyclopentanyl methacrylate (DCPMA) and 40 parts by weight of methyl methacrylate (MMA) were mixed as monomer components, 3.5 parts by weight of α-thioglycerol was added as a chain transfer agent, and 100 parts by weight of toluene was added as a polymerization solvent. The mixture was stirred at 70°C for 1 hour under a nitrogen atmosphere. Next, 0.2 parts by weight of 2,2'-azobisisobutyronitrile (AIBN) was added as a thermal polymerization initiator, and the mixture was reacted at 70°C for 2 hours, then the temperature was raised to 80°C and the reaction was continued for 2 hours. After that, the reaction mixture was heated to 130°C to dry and remove toluene, chain transfer agent and unreacted monomers, obtaining a solid acrylic oligomer (oligomer A). The weight-average molecular weight of oligomer A was 5100, and the glass transition temperature (Tg) was 130°C.

[0199] [Manufacturing Example 2] (Preparation of adhesive composition (a) for adhesive tape for protecting optical components) As monomer components for prepolymer formation, 40 parts by weight of lauryl acrylate (LA), 50 parts by weight of 2-ethylhexyl acrylate (2EHA), 4 parts by weight of 4-hydroxybutyl acrylate (4HBA), and 6 parts by weight of N-vinyl-2-pyrrolidone (NVP), along with 0.015 parts by weight of BASF's "Irgacure 184" as a photopolymerization initiator, were blended and polymerized by irradiation with ultraviolet light to obtain a prepolymer composition (polymerization rate: approximately 10%). To 100 parts by weight of the above prepolymer composition, 0.07 parts by weight of 1,6-hexanediol diacrylate (HDDA), 3 parts by weight of oligomer A prepared in Production Example 1, and 0.3 parts by weight of silane coupling agent (Shin-Etsu Chemical Co., Ltd. "KBM403") were added as post-addition components. These were then uniformly mixed to obtain adhesive composition (a) for adhesive tape for protecting optical components.

[0200] [Manufacturing Example 3] (Preparation of adhesive composition (b) for adhesive tape for protecting optical components) 63 parts by weight of 2-ethylhexyl acrylate (2EHA), 15 parts by weight of N-vinyl-2-pyrrolidone (NVP), 9 parts by weight of methyl methacrylate (MMA), 13 parts by weight of 2-hydroxyethyl acrylate (HEA), 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 placed in a separable flask and stirred for 1 hour while introducing nitrogen gas. After removing oxygen from the polymerization system in this way, the temperature was raised to 65°C and the reaction was allowed to proceed for 10 hours. Then, ethyl acetate was added to obtain a solution of acrylic polymer with a solid content of 30% by weight. To the obtained acrylic polymer solution, an isocyanate-based crosslinking agent (trade name "Takenate D110N", manufactured by Mitsui Chemicals, Inc.) was added in an amount of 1 part by weight on a solids basis per 100 parts by weight of solids of the acrylic polymer to obtain adhesive composition (b) for adhesive tape for protecting optical components.

[0201] [Manufacturing Example 4] (Preparation of acrylic polymer for retaining tape) In a four-necked flask equipped with a stirring blade, thermometer, nitrogen gas inlet tube, and condenser, 100 parts by weight of 2-ethylhexyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 4 parts by weight of 2-hydroxyethyl acrylate (manufactured by Toagosei Co., Ltd.), 0.2 parts by weight of 2,2'-azobisisobutyronitrile (manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator, and 156 parts by weight of ethyl acetate were charged. Nitrogen gas was introduced while gently stirring, and the polymerization reaction was carried out for 6 hours while maintaining the liquid temperature in the flask at around 65°C. A solution (40% by weight) of an acrylic polymer with a weight-average molecular weight of 550,000 was prepared, and an acrylic polymer for retaining tape was obtained.

[0202] [Manufacturing Example 5] (Making the retaining tape) To the solution of the acrylic polymer for retaining tape manufactured in Manufacturing Example 4, 5 parts by weight of Coronate HX (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent, 0.3 parts by weight of Aqualon HS-10 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) as a crosslinking agent, and 0.03 parts by weight of Envirizer OL-1 (manufactured by Tokyo Fine Chemical Co., Ltd.) as a crosslinking catalyst were added per 100 parts by weight of solids. The solution was diluted with ethyl acetate to a total solid content of 25% by weight, stirred with a disperser, and applied to a polyester resin substrate "Lumirror S10" (thickness 38 μm, manufactured by Toray Industries, Inc.) using a fountain roll to a thickness of 10 μm after drying. It was then cured and dried under conditions of drying temperature 130°C and drying time 30 seconds. In this way, an adhesive layer was prepared on the substrate. Next, the silicone-treated side of a 25 μm thick polyester resin substrate, with one side treated with silicone, was laminated to the surface of the adhesive layer to obtain a retaining tape.

[0203] [Example 1] A 75 μm thick polyethylene terephthalate (PET) film (Mitsubishi Chemical's "Diafoil MRF75") with a silicone-based release layer on its surface was used as the base material (heavy-duty release film). On this base material, the adhesive composition (a) for adhesive tape for protecting optical components obtained in Manufacturing Example 2 was applied to a thickness of 25 μm to form a coating layer. On this coating layer, a 75 μm thick PET film (Mitsubishi Chemical's "Diafoil MRE75") with one side treated with silicone release was laminated as a cover sheet (light-duty release film). On this laminate, the irradiation intensity at the irradiation surface directly below the lamp was 5 mW / cm² from the cover sheet side. 2A black light, positioned to achieve the desired effect, was used to irradiate the material with ultraviolet light for photocuring, resulting in an adhesive sheet with a thickness of 25 μm. Subsequently, the light release film was peeled off the adhesive sheet, and the adhesive layer formed on the release liner was bonded to one side of a 25 μm thick polyimide substrate (product name "UPIREX 25RN," Ube Industries, Ltd.) prepared as the base layer. The resulting structure was passed once through an 80°C laminator (0.3 MPa, speed 0.5 m / min), then aged in a 50°C oven for one day to remove the heavy release film, and a new release liner ("DIAFOL MRF-50," Mitsubishi Plastics, Inc.) was bonded to it. In this way, an adhesive tape (1) for protecting optical components with a release liner was obtained. The obtained adhesive tape for protecting optical components with a release liner (1) was processed by press cutting to obtain adhesive tape for protecting optical components with a release liner (1A) (corresponding to adhesive tape for protecting optical components (I) 101 in Figure 3) with a length of 10 cm, a width of 5 cm, and corners 1a and 1b of which were chamfered with C0.5 mm, and adhesive tape for protecting optical components with a release liner (1B) (corresponding to adhesive tape for protecting optical components (I) 102 in Figure 3) with a length of 2 cm, a width of 5 cm, and corners 2a and 2b of which were chamfered with C0.5 mm. Next, as shown in Figure 3, the base film side of the optical component protective adhesive tape (1A) with a release liner and the base film side of the optical component protective adhesive tape (1B) with a release liner are placed on the adhesive layer of the holding tape with a gap of 1 mm in length, and the chamfered portions 1a and 1b of the optical component protective adhesive tape (1A) with a release liner face the optical component protective adhesive tape (1B), while the chamfered portions 2a and 2b of the optical component protective adhesive tape (1B) with a release liner face the opposite side of the optical component protective adhesive tape (1A), and then bonded together to obtain the optical component adhesive tape (1). The results are shown in Table 1.

[0204] [Example 2] The procedure was carried out in the same manner as in Example 1, except that the thickness of the adhesive layer was set to 15 μm to obtain an adhesive tape (2) for protecting optical components with a release liner. The results are shown in Table 1.

[0205] [Example 3] Except for setting the chamfering thickness to C0.2 mm, the procedure was carried out in the same manner as in Example 2 to obtain an adhesive tape (3) for optical components. The results are shown in Table 1.

[0206] [Example 4] Except for setting the chamfering thickness to C0.1 mm, the procedure was carried out in the same manner as in Example 2 to obtain an adhesive tape (4) for optical components. The results are shown in Table 1.

[0207] [Example 5] A commercially available release liner ("Diafole MRF-38", Mitsubishi Plastics, Inc.) was prepared. The adhesive composition (b) for adhesive tape for protecting optical components obtained in Manufacturing Example 3 was applied to one side (release surface) of the release liner so that the thickness after drying was 25 μm, and it was dried at 130°C for 3 minutes. In this way, an adhesive layer with a thickness of 25 μm, composed of the adhesive corresponding to the adhesive composition (b) for adhesive tape for protecting optical components, was formed on the release surface of the release liner, and it was aged at room temperature for 5 days. A 25 μm thick polyimide substrate (product name "UPIREX 25RN", Ube Industries, Ltd.) was prepared as the base layer. An adhesive layer formed on the release liner was bonded to one side of this base layer. The resulting structure was passed once through an 80°C laminator (0.3 MPa, speed 0.5 m / min), then aged in a 50°C oven for one day to remove the release liner, and a new release liner ("DIAFOL MRF-50", Mitsubishi Plastics, Inc.) was bonded to it. In this way, an adhesive tape (5) for protecting optical components with a release liner was obtained. An adhesive tape (5) for optical components was obtained in the same manner as in Example 2, except that the adhesive tape (5) for protecting optical components with a release liner was used as the adhesive tape for protecting optical components with a release liner. The results are shown in Table 1.

[0208] [Example 6] Except for setting the chamfering radius to R0.5 mm, the procedure was carried out in the same manner as in Example 2 to obtain an adhesive tape (6) for optical components. The results are shown in Table 1.

[0209] [Example 7] Except for setting the chamfering radius to R0.1 mm, the procedure was carried out in the same manner as in Example 2 to obtain an adhesive tape (7) for optical components. The results are shown in Table 1.

[0210] [Comparative Example 1] Except for not performing chamfering, the procedure was the same as in Example 2 to obtain an adhesive tape (C1) for optical components. The results are shown in Table 1.

[0211] [Comparative Example 2] An adhesive tape for optical components (C2) was obtained in the same manner as in Example 2, except that a 50 μm thick polyimide substrate (product name "UPIREX 50RN," Ube Industries, Ltd.) was used instead of a 25 μm thick polyimide film, and no chamfering was performed. The results are shown in Table 1.

[0212] [Table 1] [Industrial applicability]

[0213] The adhesive tape for optical components according to the embodiment of the present invention can be suitably used, for example, for attachment to foldable components and rollable components. Typical examples of foldable components and rollable components include OLEDs. [Explanation of Symbols]

[0214] Adhesive tape for optical components 1000 Adhesive tape for protecting optical components (I) 100, 101, 102, 103 Retaining 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 Chamfered section: 1Ca, 1Cb surface 10 back side 20 Side view 40, 50, 60, 70

Claims

1. An adhesive tape (I) for protecting an optical member having an adhesive layer (1) on one side of a base film (1); a holding tape (II) directly laminated on the outermost surface of the pressure-sensitive adhesive tape for protecting an optical member (I) on the side opposite to the pressure-sensitive 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 for protecting optical members (I); and two or more of the pressure-sensitive adhesive tapes for protecting optical elements (I) are laminated on one holding tape (II) in a gap-like arrangement, The thickness of the pressure-sensitive adhesive layer (1) is less than 25 μm, At least one of the corners formed on the opposing side surfaces of the two adjacent pressure-sensitive adhesive tapes for protecting optical members (I) with the gap therebetween is a chamfered portion. Adhesive tape for optical components.

2. 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.

3. The pressure-sensitive adhesive tape for optical members according to claim 1 , wherein the chamfered portion is a rounded surface, and the chamfered amount of the chamfered portion is R 0.05 mm or more.

4. 4. The pressure-sensitive adhesive tape for optical members according to claim 1, wherein a peel force A when peeling off the release liner (III) is smaller than an adhesive force B when peeling off the holding tape (II) in an environment of a temperature of 23°C and a humidity of 50% RH.

5. The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (1) has a storage modulus G' at 23°C of 5.0 x 10 ５ The pressure-sensitive adhesive tape for optical members according to claim 1 , wherein the elastic modulus is 0.05 Pa or less.

6. An adhesive tape for optical components as described in any one of claims 1 to 5, wherein at least one of the corners formed on both ends of the longitudinal side of the two or more adhesive tapes for protecting optical components (I) stacked in the longitudinal direction of the one holding tape (II) is a chamfered portion.

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