Method for manufacturing a wound body and a chemical tank, and a chemical tank

Abstract

The present invention provides a wound material that exhibits excellent adhesive reliability when bonding fluororesin to a can or the like, has minimal lifting (tunneling), and is easy to handle. Furthermore, it provides a method for manufacturing a chemical tank using this wound material. Finally, it provides a chemical tank with double-sided adhesive tape attached to the wound material. [Solution] A winding body having a structure in which a laminated sheet is wound around a core, wherein the outer diameter of the core is 160 mm or more and 550 mm or less, the laminated sheet has a double-sided adhesive tape having an adhesive layer and a separator on one side of the double-sided adhesive tape, the adhesive layer includes an adhesive layer (Y1) formed using an adhesive composition (X1), the total thickness of the adhesive layers of the double-sided adhesive tape is 300 μm or more and 1500 μm or less, and in the winding body, the laminated sheet is wound such that the separator is on the outside of the winding.

Description

[Technical Field]

[0001] This invention relates to a wound body. Furthermore, this invention relates to a method for manufacturing a chemical tank using the wound body. Moreover, this invention relates to a chemical tank with double-sided adhesive tape attached to the wound body. [Background technology]

[0002] Conventionally, adhesive tape has been widely used to fix various components. Specifically, for example, adhesive tape is used to adhere a cover panel to protect the surface of a portable electronic device to a touch panel module or display panel module, or to bond a touch panel module to a display panel module. In addition to high adhesiveness, adhesive tape used to fix such components is required to have functions such as heat resistance, thermal conductivity, and impact resistance, depending on the environment in which it is used (for example, Patent Documents 1 to 3). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2015-052050 [Patent Document 2] Japanese Patent Publication No. 2015-021067 [Patent Document 3] Japanese Patent Publication No. 2015-120876 [Overview of the project] [Problems that the invention aims to solve]

[0004] In recent years, the demand for fluororesins has been increasing in various fields due to their excellent heat resistance, chemical resistance, low dielectric properties, and water repellency. For example, polytetrafluoroethylene (PTFE) is used in a wide range of applications, such as wire insulation and building materials, due to its high mechanical strength and excellent processability.

[0005] In the semiconductor and chemical industries, many chemical solutions such as acids and alkalis are used. When storing or disposing of chemical solutions, lining tanks with fluororesin bonded to the tank body are widely used for the purpose of corrosion prevention. Conventionally, when bonding fluororesin to the tank body, adhesives such as chloroprene rubber and epoxy resin have been used for the fluororesin and the tank body respectively. However, after applying these adhesives, high-temperature treatments such as a process of drying the solvent and a process of thermally curing the adhesive at high temperature are required before bonding the fluororesin. Therefore, the working efficiency is poor and it takes time for construction. Also, in such processes, since the solvent and the adhesive itself volatilize during the high-temperature treatment, deterioration of the working environment has also been a problem. Therefore, an alternative to the adhesive tape that can bond the fluororesin to the tank body without performing high-temperature treatment has been desired.

[0006] The present invention provides a wound body that has excellent adhesive reliability when a fluororesin and a tank body or the like are bonded together, has less floating (tunneling), and is excellent in handling properties. The present invention also provides a method for manufacturing a chemical solution tank using the wound body. Further, the present invention provides a chemical solution tank to which a double-sided adhesive tape is attached in the wound body.

Means for Solving the Problems

[0007] The present disclosure 1 is a wound body having a structure in which a laminated sheet is wound around a core, wherein the outer diameter of the core is 160 mm or more and 550 mm or less, the laminated sheet has a double-sided adhesive tape having an adhesive layer and a separator on one surface of the double-sided adhesive tape, the adhesive layer includes an adhesive layer (Y1) formed using an adhesive composition (X1), the total thickness of the adhesive layers of the double-sided adhesive tape is 300 μm or more and 1500 μm or less, and in the wound body, the laminated sheet is wound so that the separator is on the outer side of the winding. In the present disclosure 2, when the surface having the separator in the double-sided adhesive tape is defined as surface (a) and the 180° peel strength at 23°C at the interface between surface (a) and the separator is designated as F1, F1 is 150 mN / 50 mm or more and 2000 mN / 50 mm or less, and it is the wound body of the present disclosure 1. In the present disclosure 3, when the surface without the separator in the double-sided adhesive tape is defined as surface (b) and, when surface (b) is bonded to the surface of the separator that is not in contact with surface (a) of the double-sided adhesive tape, and the 180° peel strength at 23°C at the interface between surface (b) and the separator is designated as F2, F2 is 1000 mN / 50 mm or less, and it is the wound body of the present disclosure 2. The present disclosure 4 is a wound body having a structure in which a laminated sheet is wound around a core, where the outer diameter of the core is 160 mm or more and less than 550 mm, the laminated sheet has a double-sided adhesive tape having an adhesive layer and separators on both sides of the double-sided adhesive tape, the adhesive layer includes an adhesive layer (Y1) formed using an adhesive composition (X1), and the total thickness of the adhesive layers of the double-sided adhesive tape is 300 μm or more and 1500 μm or less. In the present disclosure 5, the separators on both sides of the laminated sheet have different 180° peel strengths at 23°C with the double-sided adhesive tape. The separator with the greater 180° peel strength is the first separator, and the separator with the smaller 180° peel strength is the second separator, and it is the wound body of the present disclosure 4. In the present disclosure 6, the 180° peel strength F3 at 23° between the first separator and the double-sided adhesive tape is 150 mN / 50 mm or more and 2000 mN / 50 mm or less, and it is the wound body of the present disclosure 5. In the present disclosure 7, the 180° peel strength F4 at 23° between the second separator and the double-sided adhesive tape is 1000 mN / 50 mm or less, and it is the wound body of the present disclosure ⑤ or the present disclosure ⑥. In the present disclosure 8, the separator is composed of at least one selected from the group consisting of a polyester resin, a polyolefin resin, and paper, and it is the wound body of the present disclosure 1, 2, 3, 4, 5, 6, or 7. Disclosure 9 is a wound body of Disclosure 1, 2, 3, 4, 5, 6, 7, or 8, wherein the separator has a release layer containing at least one release agent selected from the group consisting of polyolefin-based release agents, silicone-based release agents, and fluororesin-based release agents. Disclosure 10 is a winding of Disclosure 1, 2, 3, 4, 5, 6, 7, 8, or 9, wherein the adhesive composition (X1) contains a base polymer (P1), and the base polymer (P1) comprises at least one selected from the group consisting of (meth)acrylic copolymers and styrene-based elastomers. Disclosure 11 is a wound body of Disclosure 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, wherein the adhesive composition (X1) further contains a tackifying resin (T1). Disclosure 12 is a wound body of Disclosure 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, wherein the adhesive layer (Y1) has a 180° peel force of 50 N / 25 mm or more against SUS at 23°C. Disclosure 13 is a wound body of Disclosure 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, wherein the adhesive layer comprises an adhesive layer (Y2) formed using an adhesive composition (X2). Disclosure 14 is a winding of Disclosure 13, wherein the adhesive composition (X2) contains a base polymer (P2), and the base polymer (P2) comprises at least one selected from the group consisting of (meth)acrylic copolymers and styrene-based elastomers. Disclosure 15 is a wound body of Disclosure 13 or 14, wherein the adhesive composition (X2) further contains a tackifying resin (T2). Disclosure 16 is a wound body of Disclosure 15, wherein the tackifying resin (T2) includes a tackifying resin (T2-1) having at least one constituent unit (A) selected from the group consisting of constituent units (A-1), (A-1'), (A-2), (A-2'), (A-3), (A-3'), (A-4), and (A-4') represented by the following formula. Disclosure 17 is a wound body of Disclosure 13, 14, 15, or 16, wherein the adhesive layer (Y2) has a 180° peel strength of 5.0 N / 25 mm or more against polytetrafluoroethylene (PTFE) at 23°C. Disclosure 18 is a wound body of Disclosure 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 or 17, wherein the laminated sheet has a base material, and the base material contains at least one selected from the group consisting of polyester resin, polyimide resin, polyether resin, polyolefin resin, polyurethane resin, metal, glass fiber, and carbon fiber. Disclosure 19 is a wound body of Disclosure 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18 used for lining a tank body in a chemical tank. Disclosure 20 is a method for manufacturing a chemical tank, comprising: a lining sheet manufacturing step of pressing a sheet containing fluororesin onto the adhesive layer (Y2) of the double-sided adhesive tape in the wound body of Disclosure 13, 14, 15, 16, or 17; a separator peeling step of peeling off the separator on the adhesive layer (Y1) side from the lining sheet manufactured in the lining sheet manufacturing step to expose the adhesive layer (Y1); and a lining sheet bonding step of bonding the adhesive layer (Y1) to the inside of the tank body of the chemical tank. Disclosure 21 is a chemical tank in which double-sided adhesive tape from the wound bodies of Disclosures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, and 19 is attached to the inner surface of the can body.

[0008] [ka]

[0009] [ka]

[0010] [ka]

[0011] [ka]

[0012] In the formula, R 1 ~R 7 * represents a hydrogen atom, an aliphatic hydrocarbon group, an aromatic hydrocarbon group, a polar functional group, an aliphatic hydrocarbon group having a polar functional group, or an aromatic hydrocarbon group having a polar functional group, respectively. n and l each represent an integer between 2 and 4, and n' and l' each represent an integer between 2 and 5. m and k each represent an integer between 1 and 4, and m' and k' each represent an integer between 1 and 5. * represents a linking part. The present invention will be described in detail below. Furthermore, the winding body described in Disclosure 1 will also be referred to as the "winding body of Invention 1," and the winding body described in Disclosure 4 will also be referred to as the "winding body of Invention 2." In addition, matters common to the winding body of Invention 1 and the winding body of Invention 2 will not be specifically specified, or will be described as "the winding body of the present invention."

[0013] When using adhesive tape to bond fluororesin to can bodies or other structures, the thickness of the adhesive tape must be above a certain level to improve adhesive reliability. On the other hand, adhesive tape is usually manufactured as a roll, and when using a roll of thick adhesive tape, if a standard-sized core (outer diameter 3 inches) is used, the curvature of the wound adhesive tape becomes large, preventing the adhesive layer and the separator protecting the adhesive layer from adhering tightly together. This can result in tunneling (lifting) of the manufactured roll. Therefore, it has been difficult to obtain a roll with excellent adhesive reliability and minimal tunneling (lifting). Therefore, the present inventors investigated winding a laminated sheet having a double-sided adhesive tape with a relatively thick adhesive layer and a separator that protects the adhesive layer on one side of the double-sided adhesive tape, and winding this laminated sheet around a large core. As a result, they found that it is possible to obtain a winding that has excellent adhesive reliability when bonding fluororesin to a can or the like, and exhibits less lifting (tunneling), thus completing the present invention 1. Furthermore, the inventors investigated winding a double-sided adhesive tape having a relatively thick adhesive layer and a laminated sheet having separators on both sides of the double-sided adhesive tape to protect the adhesive layer, and winding this laminated sheet around a large core. As a result, they found that it is possible to obtain a winding that has excellent adhesive reliability when bonding fluororesin to a can or the like, and exhibits less lifting (tunneling), thus completing Invention 2.

[0014] The winding body of the present invention has a structure in which laminated sheets are wound around a winding core. Since the winding core has a concentric structure, the winding body of the present invention has a concentric structure. The above-mentioned core has an outer diameter with a lower limit of 160 mm and an upper limit of 550 mm. By having an outer diameter of 160 mm or more, it is possible to suppress the occurrence of tunneling in the wound laminated sheet. By having an outer diameter of 550 mm or less, it is possible to easily manufacture the wound body of the present invention. The preferred lower limit of the outer diameter of the above-mentioned core is 220 mm, the preferred upper limit is 350 mm, the more preferred lower limit is 250 mm, and the more preferred upper limit is 280 mm. The "outer diameter of the winding core" mentioned above can be calculated using the following formula (1). Outer diameter of the core (mm) = {(Inner diameter of the core) + 2 × (Wall thickness of the core)} (1)

[0015] The winding core has a preferred lower limit of 140 mm and a preferred upper limit of 530 mm for its inner diameter. Having an inner diameter of 140 mm or more makes it easier to adjust the outer diameter of the winding core within the above-mentioned range, thereby further suppressing tunneling of the wound laminated sheet. Having an inner diameter of 530 mm or less makes it easier to adjust the outer diameter of the winding core within the above-mentioned range, thereby facilitating the manufacture of the winding body of the present invention. A more preferred lower limit for the inner diameter of the winding core is 200 mm, a more preferred upper limit is 330 mm, an even more preferred lower limit is 230 mm, and an even more preferred upper limit is 260 mm.

[0016] The above-mentioned core has a preferred lower limit of 3 mm and a preferred upper limit of 20 mm in wall thickness. Having a wall thickness of 3 mm or more makes it easier to adjust the outer diameter of the core within the above-mentioned range, thereby further suppressing tunneling of the wound laminated sheet. Furthermore, the core maintains adequate strength and can withstand the weight applied during the winding of the laminated sheet. Having a wall thickness of 20 mm or less makes it easier to adjust the outer diameter of the core within the above-mentioned range, thereby facilitating the manufacture of the wound body of the present invention. A more preferred lower limit for the wall thickness is 4 mm, a more preferred upper limit is 18 mm, an even more preferred lower limit is 5 mm, and an even more preferred upper limit is 15 mm.

[0017] The materials that make up the core mentioned above include paper, plastic, and the like. Examples of the above-mentioned types of paper include recycled paper, kraft paper, and cardboard. Furthermore, the core material may be made by impregnating the aforementioned types of paper with phenolic resin, epoxy resin, glass fiber, carbon fiber, etc. Examples of the above-mentioned plastics include polyethylene, polypropylene, polystyrene, acrylonitrile-butadiene-styrene copolymer (ABS resin), phenolic resin, epoxy resin, etc. Furthermore, as the material constituting the core, materials such as those impregnated with glass fibers, carbon fibers, etc., may be used.

[0018] The laminated sheet described above has double-sided adhesive tape and a separator. The laminated sheet in the winding body of the present invention 1 comprises a double-sided adhesive tape having an adhesive layer and a separator on one side of the double-sided adhesive tape. If the double-sided adhesive tape has an adhesive layer (Y2) described later, it is preferable that the laminated sheet in the winding body of the present invention 1 has the separator on the side of the adhesive layer (Y1) described later.

[0019] In the winding body of the present invention 1, the laminated sheet is wound such that the separator is on the outside of the winding (the side furthest from the core). By winding the laminated sheet so that the separator is on the outside of the winding, the adhesive layer of the double-sided adhesive tape on the laminated sheet can be protected more effectively.

[0020] In the wound body of the present invention 1, when the surface of the double-sided adhesive tape having a separator is defined as surface (a), and the 180° peel force at 23°C at the interface between surface (a) and the separator is defined as F1, the preferred lower limit of F1 is 150 mN / 50 mm, and the preferred upper limit is 2000 mN / 50 mm. When F1 is 150 mN / 50 mm or more, the separator has the peel force necessary to protect the adhesive layer. Therefore, when bonding the fluororesin to a can or the like, the peeling of the separator from the adhesive layer can be further suppressed, and the fluororesin and the can or the like can be bonded more easily. When F1 is 2000 mN / 50 mm or less, the separator is not too hard, and the problem of the separator not being able to peel off from the adhesive layer during use can be suppressed. A more preferable lower limit for F1 is 250 mN / 50 mm, and a more preferable upper limit is 1600 mN / 50 mm. The following are some examples of methods for measuring F1 as described above. Specifically, first, the laminated sheet is removed from the wound body of Invention 1 without peeling off the separator, the side of the laminated sheet without the separator is backed with a 23 μm thick biaxially oriented PET film, and then cut to a size of 50 mm wide and 100 mm long to prepare a test specimen. Next, the prepared test specimen can be measured by peeling the separator from the double-sided adhesive tape 180° using a tensile testing machine (such as Shimadzu Corporation's "Autograph") in accordance with JIS Z0237, under conditions of 23°C and a peeling speed of 300 mm / min.

[0021] In the winding body of the present invention 1, the side of the double-sided adhesive tape that does not have a separator is defined as surface (b), and when surface (b) is attached to the side of the separator that is not in contact with surface (a) of the double-sided adhesive tape, if the 180° peel force at 23°C at the interface between surface (b) and the separator is F2, then the preferred upper limit of F2 is 1000 mN / 50 mm. By having F2 be 1000 mN / 50 mm or less, when the laminated sheet is wound, it is possible to suppress strong adhesion between the adhesive layer on the inside of the winding (closer to the core) where the separator is not laminated and the separator on the outside of the winding, and when the winding body of the present invention 1 is used, the laminated sheet can be removed more easily. A more preferred upper limit of F2 is 500 mN / 50 mm. Furthermore, a preferred lower limit for F2 is 30mN / 50mm. When F2 is 30mN / 50mm or higher, when the laminated sheet of the present invention 1 is wound, the adhesive layer on the inside of the winding of the laminated sheet, where the separator is not laminated, and the separator on the outside of the winding have appropriate adhesion, making it possible to easily wind the laminated sheet of the present invention 1. A more preferred lower limit for F2 is 50mN / 50mm. The following are some examples of methods for measuring F2. Specifically, first, a laminated sheet is removed from the winding body of Invention 1, and the adhesive surface exposed by peeling off the separator in the laminated sheet is backed with a 23 μm thick biaxially oriented PET film. Next, the opposite adhesive surface is attached to the back surface of the peeled separator (a different surface from the separator surface that the backing adhesive layer was in contact with before the separator was peeled off), and then cut to a size of 50 mm wide and 100 mm long to prepare a test piece. Then, the prepared test piece can be measured by peeling the separator 180° from the double-sided adhesive tape using a tensile testing machine (such as Shimadzu Corporation's "Autograph") in accordance with JIS Z0237, under conditions of 23°C and a peeling speed of 300 mm / min.

[0022] In the laminated sheet of the wound body of the present invention 1, it is preferable that F1 and F2 satisfy the following formula (2). F1 / F2≧2.0 (2) The laminated sheet of the winding body of the present invention 1 satisfies formula (2) above, which makes it possible to further suppress the peeling of the separator when bonding the fluororesin to a can or the like, and makes it easier to bond the fluororesin to the can or the like. Furthermore, the winding body of the present invention 1 can suppress strong adhesion between the adhesive layer where the separator located on the inside of the winding body is not laminated and the separator located on the outside of the winding body, making it easier to use. The more preferable lower limit of F1 / F2 is 4.0, and the even more preferable lower limit is 5.0. Furthermore, if F1 is extremely large, the separator's peelability will be poor, and if F2 is extremely small, the separator will peel off before use. Therefore, from the viewpoint of balancing the peeling forces of both, the preferred upper limit for F1 / F2 is 40, and the more preferred upper limit is 30.

[0023] The laminated sheet in the wound body of the present invention 2 comprises a double-sided adhesive tape having an adhesive layer and separators on both sides of the double-sided adhesive tape. In addition, in the laminated sheet of the wound body of the present invention 2, the separators on both sides may be of the same type or different types, and any separators can be used independently on each side as long as the effects of the present invention are not impaired.

[0024] In the wound body of the present invention 2, the separators on both sides of the laminated sheet have different magnitudes of 180° peel force at 23°C from the double-sided adhesive tape, and it is preferable that the separator with the greater 180° peel force is designated as the first separator and the separator with the smaller 180° peel force is designated as the second separator. By having the separators on both sides of the laminated sheet as the first separator and the second separator, it becomes possible to further suppress the peeling of the separator from the adhesive layer when bonding the fluororesin to a can or the like, and it becomes possible to bond the fluororesin to the can or the like more easily.

[0025] In the winding body of the present invention 2, it is preferable that the laminated sheet is wound such that the first separator is on the outside of the winding. By winding the laminated sheet such that the first separator is on the outside of the winding, the adhesive layer of the double-sided adhesive tape on the laminated sheet can be protected more effectively.

[0026] The preferred lower limit of the 180° peel force F3 at 23°C between the first separator and the double-sided adhesive tape is 150 mN / 50 mm, and the preferred upper limit is 2000 mN / 50 mm. When F3 is 150 mN / 50 mm or more, the separator has the peel force necessary to protect the adhesive layer. Therefore, when bonding the fluororesin to a can or the like, the peeling of the separator from the adhesive layer can be further suppressed, and the fluororesin and the can or the like can be bonded more easily. When F3 is 2000 mN / 50 mm or less, the separator is not too hard, and the problem of the separator not being able to peel off the adhesive layer during use can be suppressed. The more preferred lower limit of F3 is 250 mN / 50 mm, and the more preferred upper limit is 1600 mN / 50 mm. The following are some examples of methods for measuring F3. Specifically, first, the laminated sheet is removed from the winding body of Invention 2, the second separator of the laminated sheet is peeled off, the exposed adhesive surface is backed with a 23 μm thick biaxially oriented PET film, and then cut to a size of 50 mm wide and 100 mm long to prepare a test specimen. Next, the prepared test specimen can be measured by using a tensile testing machine (such as Shimadzu Corporation's "Autograph") in accordance with JIS Z0237, under conditions of 23°C and a peeling speed of 300 mm / min, by peeling the first separator from the double-sided adhesive tape at a 180° angle.

[0027] The 180° peel force F4 between the second separator and the double-sided adhesive tape at 23°C The preferred upper limit for F4 is 1000 mN / 50 mm. By keeping F4 below 1000 mN / 50 mm, the separator is not too hard, and the problem of the separator being unable to peel off the adhesive layer during use can be prevented. A more preferred upper limit for F4 is 500 mN / 50 mm. Furthermore, the preferred lower limit for F4 is 30mN / 50mm. When F4 is 30mN / 50mm or higher, the separator has sufficient peel strength to protect the adhesive layer. A more preferred lower limit for F4 is 50mN / 50mm. Furthermore, the following methods are examples of methods for measuring F4 as described above. Specifically, first, the laminated sheet is removed from the winding body of Invention 2, the first separator of the laminated sheet is peeled off, the exposed adhesive surface is backed with a 23 μm thick biaxially oriented PET film, and then cut to a size of 50 mm wide and 100 mm long to prepare a test specimen. Next, the prepared test specimen can be measured by using a tensile testing machine (such as Shimadzu Corporation's "Autograph") in accordance with JIS Z0237, under conditions of 23°C and a peeling speed of 300 mm / min, by peeling the second separator from the double-sided adhesive tape at a 180° angle.

[0028] In the laminated sheet of the wound body of the present invention 2, it is preferable that F3 and F4 satisfy the following formula (3). F3 / F4≧2.0 (3) The laminated sheet in the wound body of the present invention 2 satisfies formula (3) above, which makes it possible to suppress the peeling of the separator when bonding the fluororesin to a can body or the like, and makes it easier to bond the fluororesin to the can body or the like. The preferred lower limit for F3 / F4 is 4.0, and the more preferred lower limit is 5.0. Furthermore, if F3 is extremely large, the separator's peelability will be poor, and if F4 is extremely small, the separator will peel off before use. Therefore, from the viewpoint of balancing the peeling forces of both, the preferred upper limit for F3 / F4 is 40, and the more preferred upper limit is 30.

[0029] Methods for adjusting F1, F2, F3, and F4 above include introducing a release layer described later into the separator, adjusting the thickness of the release layer, changing the composition of the adhesive layer described later (for example, adding a tackifying resin), adjusting the thickness of the adhesive layer described later (for example, increasing the thickness of the adhesive layer to increase the 180° peeling force), and, in the laminated sheet of the wound body of the present invention 2, using different types of separators on each side. Furthermore, by individually adjusting F1, F2, F3, and F4, F1 / F2 and F3 / F4 can be adjusted to an appropriate range.

[0030] The separator is preferably composed of at least one material selected from the group consisting of polyester resin, polyolefin resin, and paper. By being composed of at least one material selected from the group consisting of polyester resin, polyolefin resin, and paper, the separator has excellent resistance to the heat and tension applied during tape manufacturing, and thermal shrinkage and damage to the separator can be prevented.

[0031] Examples of separators made from the above-mentioned polyester resin include polyethylene terephthalate (PET) film, polyethylene-2,6-naphthalate (PEN) film, polybutylene terephthalate (PBT) film, polypropylene terephthalate (PPT) film, or films made from copolymers mainly composed of the constituent components of these resins. Examples of separators made from the above-mentioned polyolefin resin include polypropylene film, polyethylene film, polyethylene-vinyl acetate copolymer (EVA) film, and the like. Examples of separators made from the above-mentioned paper include kraft paper, fine paper, and glassine paper.

[0032] It is preferable that the separator has a release layer on at least one side. Having a release layer on at least one side of the separator makes it easier to reduce the 180° peel force between the separator and the double-sided adhesive tape, and makes it easier to adjust F1, F2, F3, and F4 within a preferred range. Furthermore, it is preferable that the separator has release layers on both sides, as it becomes possible to have the separator on only one side of the laminated sheet, and the manufacturing cost of the laminated sheet can be further reduced.

[0033] In this specification, the term "release layer" includes not only a layer on the surface of the separator substrate that has been treated with a release agent, but also a layer that has release properties even if it has not been treated with a release agent on its surface. Examples of the above-mentioned mold release treatments include corona treatment, plasma treatment, sandblasting, chemical etching, and application of mold release agents such as silicone-based release agents. Examples of layers that have release properties even without the above-mentioned release treatment include polyolefin resin layers and fluororesin layers.

[0034] Preferably, the separator has a release layer containing at least one release agent selected from the group consisting of polyolefin-based release agents, silicone-based release agents, and fluororesin-based release agents. In the laminated sheet, having a release layer containing at least one release agent selected from the group consisting of polyolefin-based release agents, silicone-based release agents, and fluororesin-based release agents provides appropriate release properties to the adhesive layer.

[0035] Examples of the polyolefin-based release agents mentioned above include release agents containing polyethylene, polypropylene, ethylene-vinyl acetate copolymer (EVA), etc. A commercially available example is RA-80 (manufactured by Ashio Sangyo Co., Ltd.). Examples of the above-mentioned silicone-based release agents include release agents containing polyorganosiloxanes, and commercially available examples include LTC752 (manufactured by Toray Dow Corning) and KS-847 (manufactured by Shin-Etsu Silicone Co., Ltd.). Examples of the above-mentioned fluororesin-based release agents include release agents containing polyorganosiloxanes having fluorine-containing functional groups in their side chains, and commercially available examples include SYL-OFF 7785 (manufactured by Toray Dow Corning).

[0036] Alternatively, the above-mentioned mold release agent may be a prepared one. The method for preparing the above-mentioned release agent is not particularly limited and can be prepared by conventionally known methods. Specifically, for example, a method for preparing a silicone-based release agent involves adding a silicone composition that serves as the base polymer, a release additive to adjust the release force, and a curing catalyst to a solvent and stirring. At this time, F1, F2, F3, and F4 can be adjusted by adjusting the type and content of the release additive. Furthermore, a separator having a release layer can be produced by coating the prepared release agent described above onto the surface of the separator described above and then drying it.

[0037] The thickness of the above-mentioned release layer has a preferred lower limit of 0.02 μm and a preferred upper limit of 1.0 μm. A thickness of 0.02 μm or more in the release layer makes it easier to reduce the 180° peel force between the separator and the double-sided adhesive tape. A thickness of 1 μm or less in the release layer allows the separator and the adhesive layer of the double-sided adhesive tape to have the necessary adhesion to protect the adhesive layer. A more preferred lower limit in the thickness of the above-mentioned release layer is 0.05 μm, and a more preferred upper limit is 0.5 μm. Furthermore, by adjusting the thickness of the release layer for each separator, it becomes easier to adjust F1, F2, F3, and F4 to a desirable range.

[0038] The thickness of the separator described above has a preferred lower limit of 15 μm and a preferred upper limit of 100 μm. A separator thickness of 15 μm or more ensures that the separator and the adhesive layer of the double-sided adhesive sheet have the necessary adhesion to protect the adhesive layer. A release layer thickness of 100 μm or less makes it easier to reduce the 180° peel force between the separator and the double-sided adhesive sheet, thereby further suppressing the peeling of the adhesive layer in contact with the fluororesin-containing sheet when the separator is removed. A more preferred lower limit of 23 μm and a more preferred upper limit of 75 μm is used for the release layer thickness.

[0039] The laminated sheet described above has double-sided adhesive tape. The above-mentioned double-sided adhesive sheet has an adhesive layer. The adhesive layer of the above-mentioned double-sided adhesive sheet may be one layer or two or more layers. The total thickness of the adhesive layer of the above double-sided adhesive tape has a lower limit of 300 μm and an upper limit of 1500 μm. A total thickness of 300 μm or more of the adhesive layer of the above double-sided adhesive tape provides excellent adhesive strength, and the separator-equipped double-sided adhesive tape of the present invention exhibits excellent adhesive reliability when bonding fluororesin to a can or the like. A total thickness of 1500 μm or less of the adhesive layer of the above double-sided adhesive tape reduces the manufacturing cost of the laminated sheet. The preferred lower limit of the total thickness of the adhesive layer of the above double-sided adhesive tape is 350 μm, the preferred upper limit is 1200 μm, the more preferred lower limit is 400 μm, and the more preferred upper limit is 1000 μm.

[0040] The above adhesive layer includes an adhesive layer (Y1) formed using an adhesive composition (X1). From the viewpoint of ease of bonding, the adhesive layer (Y1) is preferably a low-tack adhesive layer. Since the adhesive layer (Y1) is a low-tack adhesive layer, stickiness of the adhesive layer (Y1) can be suppressed, and the resulting double-sided adhesive tape will have superior bonding workability.

[0041] The preferred lower limit of the probe tack value (hereinafter also referred to as "the probe tack value of the adhesive layer (Y1) at 23°C") measured under the conditions of 23°C, applied pressure of 98 gf, applied speed of 100 mm / sec, applied time of 10 seconds, and release speed of 5 mm / sec is 20 N / 5 mmφ. A probe tack value of 20 N / 5 mmφ or higher for the adhesive layer (Y1) at 23°C provides adequate adhesive strength, making it easier to adjust the application position of the double-sided adhesive tape, thus improving the workability of the bonding process. A more preferred lower limit for the probe tack value of the adhesive layer (Y1) at 23°C is 22 N / 5 mmφ. Furthermore, the preferred upper limit of the probe tack value of the adhesive layer (Y1) at 23°C is 25N / 5mmφ. By having a probe tack value of the adhesive layer (Y1) at 23°C of 25N / 5mmφ or less, the stickiness of the adhesive layer (Y1) can be suppressed, and the double-sided adhesive tape will have superior bonding workability. The more preferred upper limit of the probe tack value of the adhesive layer (Y1) at 23°C is 23N / 5mmφ. The probe tack value of the adhesive layer (Y1) at 23°C can be measured by a probe tack test in accordance with JIS Z 3284. Specifically, for example, a test piece can be prepared by cutting the above-mentioned double-sided adhesive tape to a size of 30 mm in width and 30 mm in length. The probe tack test can then be performed on the adhesive layer (Y1) of the prepared test piece using a probe tack tester (RHESCA, "TAC-2," etc.) under the following conditions: 23°C, pressurized pressure of 98 gf, pressurization speed of 100 mm / sec, pressurization time of 10 seconds, and release speed of 5 mm / sec. Furthermore, in this specification, the term "adhesion" refers not only to a permanent bonding phenomenon but also to a temporary bonding phenomenon called "tackiness."

[0042] Methods for adjusting the probe tack value of the adhesive layer (Y1) at 23°C include changing the composition and content ratio of the base polymer (P1) and the tackifying resin (T1) described later, and changing the thickness of the adhesive layer (Y1).

[0043] The adhesive layer (Y1) preferably contains a base polymer (P1). The base polymer (P1) described above preferably contains at least one selected from the group consisting of (meth)acrylic copolymer, styrene elastomer, ethylene-vinyl acetate copolymer, chloroprene rubber, nitrile rubber, polyurethane resin, polyamide resin, polyolefin resin, polyester resin, epoxy resin, and silicone resin. In particular, from the viewpoint of making it easier to adjust the probe tack value of the adhesive layer (Y1) at 23°C and from the viewpoint of improving the heat resistance of the adhesive layer (Y1), it is preferable to include at least one selected from the group consisting of (meth)acrylic copolymer and styrene elastomer. Furthermore, from the viewpoint of suppressing contamination of the adherend, it is preferable that the base polymer (P1) is a base polymer other than silicone resin. In this specification, the term "base polymer" refers to a polymer that accounts for 50% by mass or more of the polymers with a weight-average molecular weight of 50,000 or more contained in the adhesive composition. Furthermore, in this specification, "(meth)acrylic" means acrylic or methacrylic.

[0044] The above (meth)acrylic copolymer preferably has constituent units derived from alkyl (meth)acrylate. The alkyl (meth)acrylate described above preferably includes an alkyl (meth)acrylate having an alkyl group with 4 to 12 carbon atoms at its ester terminus. That is, the (meth)acrylic copolymer preferably has structural units derived from alkyl (meth)acrylate having an alkyl group with 4 to 12 carbon atoms at its ester terminus. By having structural units derived from alkyl (meth)acrylate having an alkyl group with 4 to 12 carbon atoms at its ester terminus, the glass transition temperature (Tg) of the (meth)acrylic copolymer is further reduced. As a result, the flexibility of the adhesive layer (Y1) is further improved, and the workability of the resulting double-sided adhesive sheet is further improved. In addition, the adhesive strength of the adhesive layer (Y1) to the fluororesin is also further improved. In this specification, "(meth)acrylate" means acrylate or methacrylate. Furthermore, in this specification, the term "alkyl (meth)acrylate having an alkyl group at the ester terminus" means a (meth)acrylate in which an alkyl group is bonded to the oxygen atom of the ester bond.

[0045] Examples of alkyl (meth)acrylates having an alkyl group with 4 to 12 carbon atoms at the ester terminus include n-butyl (meth)acrylate, tert-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-hexyl (meth)acrylate, n-heptyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, 1-methylheptyl (meth)acrylate, and lauryl (meth)acrylate. In particular, since the resulting double-sided adhesive tape has superior adhesion (especially to fluororesins), it is preferable that the alkyl (meth)acrylate having an alkyl group with 4 to 12 carbon atoms at the ester terminus includes alkyl (meth)acrylates having an alkyl group with 6 to 8 carbon atoms at the ester terminus. The alkyl (meth)acrylates having an alkyl group with 4 to 12 carbon atoms at the ester terminus may be used alone or in combination of two or more types.

[0046] The preferred lower limit for the content of constituent units derived from alkyl (meth)acrylate having an alkyl group with 4 to 12 carbon atoms at its ester terminus in the above (meth)acrylic copolymer is 50% by mass. When the content of constituent units derived from alkyl (meth)acrylate having an alkyl group with 4 to 12 carbon atoms at its ester terminus is 50% by mass or more, the glass transition temperature (Tg) of the above (meth)acrylic copolymer is further reduced, and as a result the flexibility of the adhesive layer (Y1) is further improved, thus improving the workability of the resulting double-sided adhesive sheet when bonded. In addition, the adhesive strength of the adhesive layer (Y1) to the fluororesin is also further improved. A more preferred lower limit for the content of constituent units derived from alkyl (meth)acrylate having an alkyl group with 4 to 12 carbon atoms at its ester terminus is 90% by mass, and an even more preferred lower limit is 95% by mass. In particular, the preferred lower limit for the content of constituent units derived from alkyl (meth)acrylate having an alkyl group with 6 to 8 carbon atoms at its ester terminus in the above (meth)acrylic copolymer is 50% by mass, a more preferred lower limit is 85% by mass, and an even more preferred lower limit is 90% by mass. Furthermore, from the viewpoint of further improving the bulk cohesive force of the adhesive layer (Y1), the preferred upper limit for the content of constituent units derived from alkyl (meth)acrylate having an alkyl group with 4 to 12 carbon atoms at the ester end is 99.5% by mass, and the more preferred upper limit is 99% by mass.

[0047] The alkyl (meth)acrylate described above may include other alkyl (meth)acrylates other than the alkyl (meth)acrylate having an alkyl group with 4 to 12 carbon atoms at its ester terminus. Examples of the other alkyl (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, myristyl (meth)acrylate, cetyl (meth)acrylate, stearyl (meth)acrylate, cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, ester of 5,7,7-trimethyl-2-(1,3,3-trimethylbutyl)octanol-1 and (meth)acrylic acid, ester of an alcohol with a total of 18 carbon atoms having 1 or 2 methyl groups in a linear main chain and (meth)acrylic acid, behenyl (meth)acrylate, arachidyl (meth)acrylate, and the like. The above-mentioned other alkyl (meth)acrylates may be used individually or in combination of two or more types.

[0048] The (meth)acrylic copolymer preferably further contains structural units derived from a polar functional group-containing monomer. The presence of structural units derived from a polar functional group-containing monomer in the (meth)acrylic copolymer increases the bulk cohesive strength of the adhesive layer (Y1), resulting in a double-sided adhesive tape with superior adhesion.

[0049] The above polar functional group is reactive, such as through crosslinking reactions, and preferably at least one selected from the group consisting of carboxyl groups, hydroxyl groups, amino groups, and epoxy groups. In particular, one selected from the group consisting of carboxyl groups and hydroxyl groups is more preferred because it can contribute to improving the adhesive strength of the resulting double-sided adhesive tape. That is, it is preferable that the above (meth)acrylic copolymer has at least one structural unit selected from the group consisting of structural units derived from polar functional group-containing monomers (carboxyl group-containing monomers) having a carboxyl group as the above polar functional group, and structural units derived from polar functional group-containing monomers (hydroxyl group-containing monomers) having a hydroxyl group as the above polar functional group. Examples of the above-mentioned carboxyl group-containing monomers include (meth)acrylic acid. Examples of the hydroxyl group-containing monomers mentioned above include 4-hydroxybutyl (meth)acrylate and 2-hydroxyethyl (meth)acrylate. Examples of polar functional group-containing monomers (epoxy group-containing monomers) having an epoxy group as the polar functional group include glycidyl (meth)acrylate. The above-mentioned monomers containing polar functional groups may be used individually or in combination of two or more types.

[0050] In the above (meth)acrylic copolymer, the preferred lower limit for the content of constituent units derived from the carboxyl group-containing monomer is 0.01% by mass, and the preferred upper limit is 3.0% by mass. By having the content of constituent units derived from the carboxyl group-containing monomer within this range, the cohesive force of the bulk of the adhesive layer (Y1) can be appropriately adjusted, resulting in a double-sided adhesive tape with superior adhesion. A more preferred lower limit for the content of constituent units derived from the carboxyl group-containing monomer is 0.05% by mass, and a more preferred upper limit is 2.0% by mass.

[0051] In the above (meth)acrylic copolymer, the preferred lower limit for the content of constituent units derived from the above hydroxyl group-containing monomer is 0.01% by mass, and the preferred upper limit is 3.0% by mass. By having the content of constituent units derived from the above hydroxyl group-containing monomer within this range, the cohesive force of the bulk of the adhesive layer (Y1) can be appropriately adjusted, resulting in an adhesive tape with superior adhesion. A more preferred lower limit for the content of constituent units derived from the above hydroxyl group-containing monomer is 0.05% by mass, and a more preferred upper limit is 2.0% by mass.

[0052] In the above (meth)acrylic copolymer, the preferred lower limit for the total content of constituent units derived from the above polar functional group-containing monomer is 0.01% by mass, and the preferred upper limit is 6.0% by mass. By having the total content of constituent units derived from the above polar functional group-containing monomer within this range, the cohesive force of the bulk of the adhesive layer (Y1) can be appropriately adjusted, resulting in a double-sided adhesive tape with superior adhesion. A more preferred lower limit for the total content of constituent units derived from the above polar functional group-containing monomer is 0.1% by mass, and a more preferred upper limit is 3.0% by mass.

[0053] The above (meth)acrylic copolymer may optionally contain structural units derived from other copolymerizable monomers other than the alkyl (meth)acrylate and the polar functional group-containing monomer. Examples of other monomers mentioned above include benzyl (meth)acrylate, 2-butoxyethyl (meth)acrylate, 2-phenoxyethyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, and polypropylene glycol mono(meth)acrylate. In addition, other monomers that can be used include vinyl carboxylates such as vinyl acetate and various monomers commonly used in acrylic polymers such as styrene. The other monomers mentioned above may be used individually or in combination of two or more.

[0054] The preferred lower limit for the weight-average molecular weight (Mw) of the above (meth)acrylic copolymer is 50,000, and the preferred upper limit is 1,600,000. A weight-average molecular weight (Mw) of 50,000 or more improves the bulk cohesive strength of the adhesive layer (Y1), resulting in a double-sided adhesive tape with superior adhesion. A weight-average molecular weight (Mw) of 1,600,000 or less further improves the adhesion of the adhesive layer (Y1) to the fluororesin. A more preferred lower limit for the weight-average molecular weight (Mw) of the above (meth)acrylic copolymer is 100,000, and a more preferred upper limit is 1,200,000.

[0055] The preferred lower limit for the ratio of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of the above (meth)acrylic copolymer (molecular weight distribution (Mw / Mn)) is 1.05, and the preferred upper limit is 10.0. When the molecular weight distribution (Mw / Mn) of the above (meth)acrylic copolymer is 1.05 or higher, the adhesive layer (Y1) becomes more flexible, and the workability of the resulting double-sided adhesive sheet is further improved. In addition, the resulting double-sided adhesive tape becomes more adhesive to fluororesin. When the molecular weight distribution (Mw / Mn) of the above (meth)acrylic copolymer is 10.0 or lower, the proportion of low molecular weight components is suppressed, the bulk cohesive force of the adhesive layer (Y1) is improved, and the resulting double-sided adhesive tape becomes more adhesive. A more preferred upper limit for the molecular weight distribution (Mw / Mn) of the above (meth)acrylic copolymer is 9.0, an even more preferred upper limit is 8.0, and an even more preferred upper limit is 7.0.

[0056] In this specification, weight-average molecular weight (Mw) and number-average molecular weight (Mn) refer to the weight-average molecular weight (Mw) and number-average molecular weight (Mn) measured in standard polystyrene equivalent as determined by gel permeation chromatography (GPC), respectively. Specifically, a (meth)acrylic copolymer is diluted 50-fold with tetrahydrofuran (THF), and the diluted solution is filtered through a filter (material: polytetrafluoroethylene, pore diameter: 0.2 μm). The obtained filtrate is supplied to a gel permeation chromatograph (Waters, "2690 Separations Module," etc.), and GPC measurement is performed under conditions of sample flow rate of 1 mL / min and column temperature of 40°C to measure the polystyrene equivalent molecular weight of the (meth)acrylic copolymer and determine the weight-average molecular weight (Mw) and number-average molecular weight (Mn). For example, a GPC KF-802.5L (Showa Denko Corporation) can be used as the column, and for example, a differential refractometer can be used as the detector. Furthermore, the molecular weight distribution (Mw / Mn) can be measured using the obtained weight-average molecular weight (Mw) and number-average molecular weight (Mn).

[0057] Methods for adjusting the weight-average molecular weight (Mw) and molecular weight distribution (Mw / Mn) of the above-mentioned (meth)acrylic copolymer to within the above range include, for example, adjusting the composition of the monomers constituting the (meth)acrylic copolymer, the polymerization method, the polymerization conditions, etc.

[0058] The preferred lower limit for the glass transition temperature (Tg) of the above (meth)acrylic copolymer is -70°C, and the preferred upper limit is -30°C. Having the glass transition temperature of the above (meth)acrylic copolymer within this range improves the workability of the resulting double-sided adhesive sheet. Furthermore, the resulting double-sided adhesive tape exhibits superior adhesion to fluororesin. A more preferred lower limit for the glass transition temperature (Tg) of the above (meth)acrylic copolymer is -60°C, and a more preferred upper limit is -40°C. In this specification, the glass transition temperature is the value obtained in the first run when measured using a differential scanning calorimeter (for example, Hitachi High-Tech Science Corporation's "SII Exstar 6000 / DSC 6220") under a nitrogen atmosphere and a heating rate of 10°C / min.

[0059] As polymerization methods for synthesizing the above-mentioned (meth)acrylic copolymer, conventionally known methods can be used in which monomers from which the above-mentioned constituent units are derived are subjected to a radical reaction in the presence of a polymerization initiator. Examples include solution polymerization (boiling point polymerization or constant temperature polymerization), emulsion polymerization, suspension polymerization, and bulk polymerization. Among these, solution polymerization is preferred because it is easy to synthesize.

[0060] When solution polymerization is used as the polymerization method described above, examples of reaction solvents include ethyl acetate, toluene, methyl ethyl ketone, methyl sulfoxide, ethanol, acetone, and diethyl ether. The above reaction solvents may be used individually or in combination of two or more types.

[0061] Examples of polymerization initiators include organic peroxides and azo compounds. Examples of the above-mentioned organic peroxides include 1,1-bis(t-hexylperoxy)-3,3,5-trimethylcyclohexane, t-hexylperoxypivalate, t-butylperoxypivalate, 2,5-dimethyl-2,5-bis(2-ethylhexanoylperoxy)hexane, t-hexylperoxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexanoate, t-butylperoxyisobutyrate, t-butylperoxy-3,5,5-trimethylhexanoate, and t-butylperoxylaurate. Examples of the above-mentioned azo compounds include azobisisobutyronitrile and azobiscyclohexanecarbonitride. The polymerization initiators described above may be used alone or in combination of two or more.

[0062] The styrene-based elastomer is preferably a block copolymer having a block derived from the styrene-based monomer and a block derived from a conjugated diene monomer, possessing rubber elasticity at room temperature, and having a hard segment portion and a soft segment portion. The block derived from the styrene-based monomer is the hard segment portion, and the block derived from the conjugated diene monomer is the soft segment portion.

[0063] Examples of the styrene monomers mentioned above include styrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, α-methylstyrene, 2,4-dimethylstyrene, 2,4-diisopropylstyrene, 4-t-butylstyrene, 5-t-butyl-2-methylstyrene, vinylethylbenzene, divinylbenzene, trivinylbenzene, divinylnaphthalene, t-butoxystyrene, vinylbenzyldimethylamine, (4-vinylbenzyl)dimethylaminoethyl ether, N,N-dimethylaminoethylstyrene, N,N-dimethylaminomethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-t-butylstyrene, 3-t-butylstyrene, 4-t-butylstyrene, vinylxylene, vinylnaphthalene, vinylpyridine, diphenylethylene, and tertiary amino group-containing diphenylethylene. Among these, styrene is preferred because it is readily available industrially. Examples of the tertiary amino group-containing diphenylethylene mentioned above include 1-(4-N,N-dimethylaminophenyl)-1-phenylethylene. The above-mentioned styrene monomers may be used individually or in combination of two or more types.

[0064] Examples of the above-mentioned conjugated diene monomers include isoprene, 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 1,3-hexadiene, 1,3-heptadiene, 2-phenyl-1,3-butadiene, 3-methyl-1,3-pentadiene, and 2-chloro-1,3-butadiene. Among these, 1,3-butadiene and isoprene are preferred due to their high polymerization reactivity and ease of industrial availability. The above-mentioned conjugated diene monomers may be used individually or in combination of two or more types.

[0065] Furthermore, in order to improve retention and heat resistance by chemically imparting a crosslinked structure to the above-mentioned conjugated diene monomer, a copolymer of a polar functional group-containing monomer such as maleic anhydride may be used for the block derived from the above-mentioned conjugated diene monomer.

[0066] Examples of the styrene-based elastomers mentioned above include styrene-isoprene-styrene (SIS) block copolymer, styrene-butadiene-styrene (SBS) block copolymer, styrene-chloroprene-styrene block copolymer, styrene-ethylene-butylene-styrene copolymer (SEBS), styrene-ethylene-propylene-styrene copolymer (SEPS), and styrene-isobutylene-styrene copolymer (SIBS). Among these, SIS block copolymer and SBS block copolymer are preferred, and SIS block copolymer is more preferred, because the resulting double-sided adhesive tape tends to exhibit high adhesive strength and is less likely to peel off the adherend even when immersed in an alkaline chemical solution. The above-mentioned styrene-based elastomers may be used individually or in combination of two or more types.

[0067] The styrene-based elastomer preferably includes a triblock copolymer of a block derived from the styrene-based monomer and a block derived from the conjugated diene monomer, and more preferably includes a diblock copolymer of a block derived from the styrene-based monomer and a block derived from the conjugated diene monomer, in addition to the triblock copolymer. The preferred lower limit for the content of the diblock copolymer in the styrene-based elastomer (hereinafter sometimes referred to as the "diblock ratio") is 50% by mass. When the diblock ratio is 50% by mass or higher, the adhesive strength of the adhesive layer (Y1) to the adherend is further improved, and the resulting double-sided adhesive tape has superior adhesive properties. In addition, the flexibility of the adhesive layer (Y1) is further improved, so the adhesive strength of the adhesive layer (Y1) to the fluororesin is further improved. A more preferred lower limit for the diblock ratio is 70% by mass. Furthermore, from the viewpoint of further improving the cohesive force of the adhesive layer (Y1), the preferred upper limit of the jiblock ratio is 90% by mass. The above diblock ratio can be calculated from the peak area ratio of each copolymer measured by gel permeation chromatography (GPC).

[0068] A preferred upper limit for the content of blocks derived from the styrene monomer in the above-mentioned styrene-based elastomer (hereinafter sometimes referred to as "styrene content") is 20% by mass. A styrene content of 20% by mass or less prevents the adhesive layer (Y1) from becoming too hard, further improving adhesion to the substrate and resulting in a double-sided adhesive tape with superior adhesion. A more preferred upper limit for the styrene content is 16% by mass. Furthermore, from the viewpoint of further improving the cohesive force of the adhesive layer (Y1), the preferred lower limit of the styrene content is 8% by mass. The above styrene content is, 1 It can be calculated from the peak area ratio of each block measured by 1H-NMR.

[0069] The preferred lower limit for the weight-average molecular weight of the above styrene-based elastomer is 50,000, and the preferred upper limit is 600,000. A weight-average molecular weight of 50,000 or more for the above styrene-based elastomer increases the bulk strength of the adhesive layer (Y1), resulting in a double-sided adhesive tape with superior adhesion. A weight-average molecular weight of 600,000 or less for the above styrene-based elastomer further improves the compatibility between the above styrene-based elastomer and other components. A more preferred lower limit for the weight-average molecular weight of the above styrene-based elastomer is 100,000, and a more preferred upper limit is 500,000.

[0070] Examples of commercially available ethylene-vinyl acetate copolymers include HM200 (manufactured by Cemedyne Co., Ltd.). Examples of commercially available chloroprene rubbers include 575F (manufactured by Cemedyne Co., Ltd.) and G17 (manufactured by Konishi Co., Ltd.). Examples of commercially available nitrile rubbers include 501F (manufactured by Cemedyne Co., Ltd.). Examples of commercially available polyurethane resins include SHM107-PUR (manufactured by Seedam Corporation). Examples of commercially available polyamide resins include SHM301-PAD (manufactured by Seedam Corporation). Examples of commercially available polyolefin resins include PPET1200F (manufactured by Toagosei Co., Ltd.). Examples of commercially available polyester resins include PH-413 (manufactured by Nippon Matai Co., Ltd.). Examples of commercially available epoxy resins include 1500 (manufactured by Cemedyne Co., Ltd.). Examples of commercially available silicone resins include KR-3700 (manufactured by Shin-Etsu Chemical Co., Ltd.).

[0071] The preferred lower limit and preferred upper limit of the content of the base polymer (P1) in the adhesive composition (X1) described above is 50% by mass. By keeping the content of the base polymer (P12) within this range, the adhesive properties such as peel strength and holding strength of the adhesive layer (Y1) can be well-balanced. A more preferred lower limit and a more preferred upper limit of the content of the base polymer (P1) described above is 75% by mass.

[0072] From the viewpoint of further improving adhesive strength, the above adhesive composition (X1) preferably contains a tackifying resin (T1).

[0073] The tackifying resin (T1) preferably contains at least one tackifying resin selected from the group consisting of rosin ester resins, terpene resins, terpene phenol resins, and petroleum resins. By including at least one of the above tackifying resins selected from the group consisting of rosin ester resins, terpene resins, terpene phenol resins, and petroleum resins in the tackifying resin (T1), the adhesive strength of the adhesive layer (Y1) can be further improved. In particular, since the adhesive strength can be further improved, it is more preferable that the tackifying resin (T1) contains at least one tackifying resin selected from the group consisting of rosin ester resins and terpene resins.

[0074] The preferred lower limit of the softening temperature of the tackifying resin (T1) is 50°C, and the preferred upper limit is 200°C. A softening temperature of 50°C or higher for the tackifying resin (T1) prevents the adhesive layer (Y1) from becoming too soft and reducing its adhesive strength. A softening temperature of 200°C or lower for the tackifying resin (T1) improves the wettability of the interface of the adhesive layer (Y1), preventing interfacial delamination. Furthermore, if the base polymer (P1) includes the (meth)acrylic copolymer, the glass transition temperature (Tg) of the (meth)acrylic copolymer is further reduced, improving the flexibility of the adhesive layer (Y1), thus improving the workability of the resulting double-sided adhesive sheet. The adhesive strength of the adhesive layer (Y1) to the fluororesin is also improved. A more preferred lower limit of the softening temperature of the tackifying resin (T1) is 70°C, and a more preferred upper limit is 150°C. Note that the softening temperature refers to the softening temperature measured according to JIS K 2207 (ring-ball method).

[0075] The preferred lower limit of the hydroxyl value of the tackifying resin (T1) is 0 mgKOH / g, and the preferred upper limit is 200 mgKOH / g. Having the hydroxyl value of the tackifying resin (T1) within this range improves the wettability of the interface of the adhesive layer (Y1), thereby suppressing interfacial delamination. A more preferred lower limit of the hydroxyl value of the tackifying resin (T1) is 30 mgKOH / g, and a more preferred upper limit is 130 mgKOH / g. The above hydroxyl value can be measured according to JIS K 1557 (phthalic anhydride method).

[0076] The rosin ester resins mentioned above are resins obtained by esterifying rosin resins mainly composed of abietic acid, disproportionated rosin resins, hydrogenated rosin resins, or dimers of resin acids such as abietic acid (polymerized rosin resins) with alcohol. Some of the hydroxyl groups of the alcohol used in esterification are not used in the esterification process and are instead contained within the resin, thereby adjusting the hydroxyl value to the range described above. Examples of such alcohols include polyhydric alcohols such as ethylene glycol, glycerin, and pentaerythritol. Examples of commercially available rosin ester resins include Pine Crystal KE-359 (manufactured by Arakawa Chemical Industries, Ltd., hydroxyl value: 40 mg KOH / g, softening temperature: 100°C).

[0077] The above-mentioned terpene resin is a resin that has structural units derived from monoterpene compounds and does not have structural units derived from aromatic compounds. Examples of commercially available terpene resins include YS Resin PX1250 (manufactured by Yasuhara Chemical Co., Ltd., hydroxyl value: 0 mg KOH / g, softening temperature: 125°C).

[0078] The above-mentioned terpene phenol resin is a resin having structural units derived from monoterpene compounds and structural units derived from phenol compounds. In this specification, the term "phenol compound" in the terpene phenol resin refers to a compound that contains an aromatic ring structure having only one phenolic hydroxyl group and does not contain an aromatic ring structure having two or more phenolic hydroxyl groups. The constituent units derived from the phenol compound in the terpene phenol resin do not include the constituent unit (A-1) and the constituent unit (A-1') in the tackifying resin (T2-1) described later. Examples of commercially available terpene phenol resins include YS Polystar G150 (manufactured by Yasuhara Chemical Co., Ltd., hydroxyl value: 120 mg KOH / g, softening temperature: 150°C).

[0079] Examples of commercially available petroleum-based resins include Alcon P-140 (manufactured by Arakawa Chemical Industries, Ltd., hydroxyl value: 0 mg KOH / g, softening temperature: 140°C).

[0080] The preferred lower limit for the content of the tackifying resin (T1) per 100 parts by mass of the base polymer (P1) is 10 parts by mass, and the preferred upper limit is 100 parts by mass. A content of 10 parts by mass or more of the tackifying resin (T1) can further improve the adhesive strength of the adhesive layer (Y1). A content of 100 parts by mass or less of the tackifying resin (T1) can prevent the adhesive layer (Y1) from becoming too hard and reducing its adhesive strength. A more preferred lower limit for the content of the tackifying resin (T1) is 20 parts by mass, and a more preferred upper limit is 80 parts by mass.

[0081] The adhesive composition (X1) preferably contains a crosslinking agent. In particular, if the base polymer (P1) contains the (meth)acrylic copolymer, the adhesive composition (X1) preferably contains a crosslinking agent. By containing a crosslinking agent in the adhesive layer (Y1), the (meth)acrylic copolymer forms a crosslinked structure through chemical crosslinking, resulting in a double-sided adhesive tape with superior adhesion. Furthermore, from the viewpoint of storage stability and other factors, the crosslinking agent may be added to the adhesive composition (X2) immediately before forming the adhesive layer (Y2).

[0082] Examples of the crosslinking agents include isocyanate-based crosslinking agents, aziridine-based crosslinking agents, epoxy-based crosslinking agents, and metal chelate-type crosslinking agents. In particular, it is preferable that the crosslinking agent includes at least one selected from the group consisting of isocyanate-based crosslinking agents and epoxy-based crosslinking agents, as this enables appropriate chemical crosslinking of the (meth)acrylic copolymer and further improves the adhesive strength of the adhesive layer (Y1).

[0083] Examples of commercially available isocyanate-based crosslinking agents include Coronate L-45 (manufactured by Tosoh Corporation), Takenate 500 (manufactured by Mitsui Chemicals), and Desmodule L-75 (manufactured by Covestro Corporation). Examples of commercially available epoxy crosslinking agents include E-5C (manufactured by Soken Chemical Co., Ltd.) and E-5XM (manufactured by Soken Chemical Co., Ltd.).

[0084] The preferred lower limit for the content of the crosslinking agent in the above adhesive composition (X1) per 100 parts by mass of the (meth)acrylic copolymer is 0.1 parts by mass, and the preferred upper limit is 10 parts by mass. Having the crosslinking agent content within this range allows for appropriate chemical crosslinking of the (meth)acrylic copolymer, further improving the adhesive strength of the adhesive layer (Y1). A more preferred lower limit for the crosslinking agent content is 0.5 parts by mass, and a more preferred upper limit is 5.0 parts by mass.

[0085] From the viewpoint of further improving adhesive strength, the above adhesive composition (X1) preferably contains a silane coupling agent. Examples of the silane coupling agents mentioned above include vinyltrimethoxysilane, vinyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, and 3-aminopropyltriethoxysilane. The silane coupling agents described above may be used individually or in combination of two or more.

[0086] The preferred lower limit for the content of the silane coupling agent per 100 parts by mass of the base polymer (P1) is 0.1 parts by mass, and the preferred upper limit is 3.0 parts by mass. A content of 0.1 parts by mass or more of the silane coupling agent can further improve the adhesive strength of the adhesive layer (Y1). A content of 3.0 parts by mass or less of the silane coupling agent can suppress bleed-out of the silane coupling agent. A more preferred lower limit for the content of the silane coupling agent is 0.5 parts by mass, and a more preferred upper limit is 2.0 parts by mass.

[0087] The above adhesive composition (X1) may optionally contain conventionally known fine particles and additives such as inorganic fine particles, conductive fine particles, antioxidants, foaming agents, organic fillers, and inorganic fillers.

[0088] The preferred lower limit for the gel fraction of the adhesive layer (Y1) is 15% by mass, and the preferred upper limit is 60% by mass. When the gel fraction of the adhesive layer (Y1) is 15% by mass or more, the bulk strength of the adhesive layer (Y1) is increased, and the resulting adhesive tape has superior adhesion. When the gel fraction of the adhesive layer (Y1) is 60% by mass or less, the flexibility of the adhesive layer (Y1) is further improved, and the adhesive strength of the adhesive layer (Y1) is further improved. The more preferred lower limit for the gel fraction of the adhesive layer (Y1) is 25% by mass, and the more preferred upper limit is 50% by mass. The gel fraction of the adhesive layer (Y1) can be measured by the following methods, etc. Specifically, a test specimen is prepared by cutting a laminate having the adhesive layer (Y1) and a substrate, or the adhesive layer (Y1) alone, into a planar rectangular shape with a width of 20 mm and a length of 40 mm. The test specimen is immersed in an organic solvent at 23°C for 24 hours, then removed from the organic solvent and dried at 110°C for 1 hour. If the base polymer (P1) is a (meth)acrylic copolymer, ethyl acetate can be used as the organic solvent; if the base polymer (P1) is a styrene-based elastomer or silicone resin, toluene can be used. The mass of the dried test specimen is measured, and the gel fraction is calculated using the following formula (4). Note that the test specimen is not laminated with a release film to protect the adhesive layer (Y1). If the test specimen does not have a substrate, W0 is calculated as 0. Gel fraction (mass %) = 100 × (W2 - W0) / (W1 - W0) (4) (W0: Mass of the substrate, W1: Mass of the test specimen before immersion, W2: Mass of the test specimen after immersion and drying)

[0089] The gel fraction of the adhesive layer (Y1) can be adjusted to within the above range by, for example, changing the type or constituent units of the base polymer (P1) (for example, changing the type of monomer constituting the (meth)acrylic copolymer), adjusting the content ratio of the base polymer (P1), adjusting the weight-average molecular weight of the base polymer (P1), adjusting the type and content of the crosslinking agent, etc.

[0090] The adhesive layer (Y1) described above has a preferred lower limit of 50 N / 25 mm for its 180° peel force against SUS at 23°C. A 180° peel force of 50 N / 25 mm or higher on the adhesive layer (Y1) side of the adhesive layer (Y1) at 23°C results in superior adhesive strength, and therefore the resulting double-sided adhesive tape has higher adhesion. A more preferred lower limit for the 180° peel force of the adhesive layer (Y1) against SUS at 23°C is 75 N / 25 mm, and an even more preferred lower limit is 100 N / 25 mm. Furthermore, there is no specific upper limit to the 180° peel force of the adhesive layer (Y1) against SUS at 23°C, but the practical upper limit is 500 N / 25 mm. The 180° peel force on the adhesive layer (Y1) at 23°C relative to SUS can be measured by the following method. Specifically, a double-sided adhesive tape, with the adhesive layer (Y2) side backed with a 23 μm thick PET film, is cut to a size of 25 mm wide x 100 mm long by making one back-and-forth motion at a speed of 300 mm / min using a 2 kg rubber roller. Then, the adhesive layer (Y1) side is placed on a SUS plate (SUS304 plate that has been washed with ethanol and then wiped dry), and a laminate is created by pressing it together under pressure of 0.1 MPa for 10 minutes in an environment of 120°C. A 180° peel test is performed on the obtained laminate using a tensile testing machine (such as "Autograph" manufactured by Shimadzu Corporation) in accordance with JIS Z 0237, under conditions of 23°C, 50% RH, and a peeling speed of 300 mm / min. By peeling the double-sided adhesive tape from the SUS plate, the 180° peel force of the adhesive layer (Y1) side relative to SUS at 23°C can be measured.

[0091] Methods for adjusting the 180° peel force of the adhesive layer (Y1) to SUS at 23°C include, for example, changing the type or constituent units of the base polymer (P1) (for example, changing the copolymerization ratio or monomer composition of the base polymer (P1)), adjusting the type or content of the tackifying resin (T1), changing the thickness of the adhesive layer (Y1), or changing the substrate.

[0092] The preferred lower limit for the thickness of the adhesive layer (Y1) is 50 μm, and the preferred upper limit is 1000 μm. By having the thickness of the adhesive layer (Y1) within this range, the adhesive layer (Y1) will have sufficient adhesive strength. A more preferred lower limit for the thickness of the adhesive layer (Y1) is 100 μm, and a more preferred upper limit is 700 μm.

[0093] The adhesive layer described above may include layers other than the adhesive layer (Y1) described above, as long as it does not impair the effects of the present invention.

[0094] Preferably, the above adhesive layer further includes an adhesive layer (Y2) formed using an adhesive composition (X2). By including the above adhesive layer (Y2), it becomes possible to select an adhesive suitable for bonding to adherends such as sheets containing fluororesin and cans, and by bonding the fluororesin via the above adhesive layer (Y2), the laminated sheet of the present invention can be easily bonded to cans and the like.

[0095] The adhesive layer (Y2) is formed using the adhesive composition (X2). The above adhesive composition (X2) preferably contains a base polymer (P2). Examples of the base polymer (P2) include (meth)acrylic copolymers, styrene elastomers, and silicone resins. In particular, the base polymer (P2) preferably contains at least one selected from the group consisting of (meth)acrylic copolymers and styrene elastomers, in order to allow for a wide range of designs for the adhesive layer (Y2) and for the adhesive layer (Y2) to exhibit strong adhesive strength. Furthermore, from the viewpoint of suppressing contamination of the adherend, the base polymer (P2) is preferably a base polymer other than a silicone resin.

[0096] Examples of the (meth)acrylic copolymer, styrene elastomer, and silicone resin in the above-mentioned base polymer (P2) are the same as those in the above-mentioned base polymer (P1).

[0097] The preferred lower limit and preferred upper limit of the content of the base polymer (P2) in the adhesive composition (X2) are 30% by mass and 99.5% by mass, respectively. Having the base polymer (P2) content within this range further improves the adhesion of the adhesive layer (Y2) to the fluororesin. A more preferred lower limit for the base polymer (P2) content is 40% by mass, a more preferred upper limit is 99% by mass, an even more preferred lower limit is 50% by mass, and an even more preferred upper limit is 95% by mass.

[0098] The above adhesive composition (X2) preferably contains a tackifying resin (T2). The tackifying resin (T2) described above preferably contains a tackifying resin (T2-1) having at least one constituent unit (A) selected from the group consisting of constituent units (A-1), (A-1'), (A-2), (A-2'), (A-3), (A-3'), (A-4), and (A-4') represented by the above formula. By including the tackifying resin (T2-1) in the adhesive composition (X1), the adhesive layer (Y2) can exhibit higher adhesive strength, particularly to adherends with low polarity (e.g., fluororesins). In particular, the interaction with the adherend can be greatly improved, and the adhesive strength to the adherend can be further enhanced, so it is preferable that the above-mentioned structural unit (A) is at least one selected from the group consisting of structural unit (A-1), structural unit (A-1'), structural unit (A-2), structural unit (A-2'), structural unit (A-3), and structural unit (A-3'), and it is more preferable that it is at least one selected from the group consisting of structural unit (A-1) and structural unit (A-1'). By the above-mentioned structural unit (A) being at least one selected from the group consisting of structural unit (A-1) and structural unit (A-1'), the interaction with the adherend can be further greatly improved. Furthermore, since monomers containing bio-derived materials, which will be described later, can be easily used as monomers constituting the above-mentioned structural unit (A-1) and structural unit (A-1'), it is preferable from the viewpoint of saving petroleum resources. Furthermore, if the base polymer (P2) contains the (meth)acrylic copolymer, the tackifying resin (T2-1) has appropriate polarity, which further improves its compatibility with the (meth)acrylic copolymer.

[0099] The tackifying resin (T2-1) may have the above-mentioned structural unit (A) in the side chain, or in the main chain skeleton or at the ends of the main chain skeleton. In particular, it is preferable that the tackifying resin (T2-1) has the above-mentioned structural unit (A) in the main chain skeleton or at the ends of the main chain skeleton, as this allows it to have suitable physical properties required as a tackifying resin.

[0100] In the above constituent unit (A), R 1 ~R 7 Each of these represents a hydrogen atom, an aliphatic hydrocarbon group, an aromatic hydrocarbon group, a polar functional group, an aliphatic hydrocarbon group having a polar functional group, or an aromatic hydrocarbon group having a polar functional group. Examples of the above-mentioned aliphatic hydrocarbon group include linear, branched, or cyclic alkyl groups having 1 to 20 carbon atoms. Examples of the above-mentioned aromatic hydrocarbon groups include substituted or unsubstituted aryl groups having 6 to 20 carbon atoms. Specific examples of the polar functional group include, for example, an amino group, a carboxy group, a carbonyl group, an alkoxy group, a hydroxy group, a nitrile group, a nitro group, etc. R 1 As R, a polar functional group other than a hydroxy group can be used. R 2 As R, a polar functional group other than a carboxy group can be used. R 3 As R, a polar functional group other than the group represented by OR 4 can be used. R 5 As R, a polar functional group other than the group represented by NR 6 R 7 can be used. Examples of the aliphatic hydrocarbon group having the polar functional group include, for example, a group in which one or more hydrogens in the aliphatic hydrocarbon group are substituted with the polar functional group, etc. Examples of the aromatic hydrocarbon group having the polar functional group include, for example, a group in which one or more hydrogens in the aromatic hydrocarbon group are substituted with the polar functional group, etc.

[0101] In the above tackifier resin (T2-1), the plurality of R 1 contained in one constitutional unit (A-1) may be the same as or different from each other. Also, the plurality of R 1 contained in different constitutional units (A-1) may be the same as or different from each other. Similarly, the plurality of R 1 contained in one constitutional unit (A-1’) may be the same as or different from each other. Also, the plurality of R 1 contained in different constitutional units (A-1’) may be the same as or different from each other.

[0102] Similarly, the plurality of R 2 contained in one constitutional unit (A-2) may be the same as or different from each other. Also, the plurality of R 2 contained in different constitutional units (A-2) may be the same as or different from each other. Similarly, the plurality of R 2These may be the same or different. Also, multiple Rs contained in different constituent units (A-2') 2 They may be the same or they may be different.

[0103] Similarly, multiple Rs contained within a single constituent unit (A-3) 3 These may be the same or different. Also, multiple Rs contained in different constituent units (A-3) 3 These may be the same or different. Similarly, multiple Rs contained within a single constituent unit (A-3') 3 These may be the same or different. Also, multiple Rs contained in different constituent units (A-3') 3 They may be the same or they may be different.

[0104] Similarly, multiple Rs contained within a single constituent unit (A-3) 4 These may be the same or different. Also, multiple Rs contained in different constituent units (A-3) 4 These may be the same or different. Similarly, multiple Rs contained within a single constituent unit (A-3') 4 These may be the same or different. Also, multiple Rs contained in different constituent units (A-3') 4 They may be the same or they may be different.

[0105] Similarly, multiple Rs contained within a single constituent unit (A-4) 5 These may be the same or different. Also, multiple Rs contained in different constituent units (A-4) 5 These may be the same or different. Similarly, multiple Rs contained within a single constituent unit (A-4') 5 These may be the same or different. Also, multiple Rs contained in different constituent units (A-4') 5 They may be the same or they may be different.

[0106] Similarly, multiple Rs contained within a single constituent unit (A-4) 6 and R 7 These may be the same or different. Also, multiple Rs contained in different constituent units (A-4) 6 and R 7 These may be the same or different. Similarly, multiple Rs contained within a single constituent unit (A-4') 6 and R 7 These may be the same or different. Also, multiple Rs contained in different constituent units (A-4') 6 and R 7 They may be the same or they may be different.

[0107] In the above-mentioned structural unit (A), n and l are integers between 2 and 4, and n' and l' are integers between 2 and 5, but from the viewpoint of ease of obtaining raw materials, it is preferable that n, l, n', and l' are 2 or 3, and it is even more preferable that n, l, n', and l' are 3, as this can further improve the adhesive strength of the adhesive layer (Y2).

[0108] In the above-mentioned structural unit (A), m and k are integers between 1 and 4, and m' and k' are integers between 1 and 5, but from the viewpoint of ease of obtaining raw materials, it is preferable that m, k, m', and k' are 1, 2, or 3, and it is more preferable that m, k, m', and k' are 1, as this can further improve the adhesive strength of the adhesive layer (Y2).

[0109] More specifically, the above-mentioned constituent units (A-1) and (A-1') include, for example, a constituent unit derived from dihydroxybenzene or its derivatives (when n and n' are 2), a constituent unit derived from trihydroxybenzene or its derivatives (when n and n' are 3), and so on. These constituent units may be used individually, or two or more may be used in combination.

[0110] Examples of the above-mentioned dihydroxybenzene or its derivatives include resorcinol, pyrocatechol, hydroquinone, dihydroxytoluene, dihydroxyxylene, dihydroxyphenylethylamine hydrochloride, dihydroxybenzoic acid, dihydroxyphenylacetic acid, dihydroxyhydrocinnamic acid, dihydroxyphenylpropionic acid, dihydroxyphenylalanine, dihydroxybenzaldehyde, dihydroxyacetophenone, diacetyldihydroxybenzene, dihydroxyphenyl-2-butanone, dihydroxyphenylmethyl acetate, benzyldihydroxyphenyl ketone, dihydroxybenzamide, dihydroxymethoxybenzene, dihydroxybenzyl alcohol, dihydroxyphenylethanol, dihydroxyphenyl glycol, dihydroxyphenylacetonitrile, and dihydroxynitrobenzene. Among these, pyrocatechol is preferred because it has low steric hindrance and readily interacts with the adherend. The above-mentioned dihydroxybenzene or its derivatives may be used alone or in combination of two or more types.

[0111] Examples of the above-mentioned trihydroxybenzene or its derivatives include pyrogallol, 1,2,4-trihydroxybenzene, phloroglucinol, trihydroxytoluene, trihydroxydiphenylmethane, 6-hydroxy-L-dopa, gallic acid, methyl gallate, butyl gallate, isobutyl gallate, isoamyl gallate, hexadecyl gallate, stearyl gallate, trihydroxyacetophenone, trihydroxyphenylethanone, trihydroxyphenylbutanone, trihydroxybenzaldehyde, trihydroxybenzamide, and trihydroxynitrobenzene. Among these, pyrogallol is preferred because it has low steric hindrance and readily interacts with the adherend. The above-mentioned trihydroxybenzene or its derivatives may be used alone or in combination of two or more types.

[0112] More specifically, the above-mentioned constituent units (A-2) and (A-2') include constituent units derived from benzoic acid, salicylic acid, dihydroxybenzoic acid, gallic acid, 2-methylbenzoic acid, 3-methylbenzoic acid, 4-methylbenzoic acid, 2-ethylbenzoic acid, 3-ethylbenzoic acid, 4-ethylbenzoic acid, 4-tert-butylbenzoic acid, 2-vinylbenzoic acid, 3-vinylbenzoic acid, 4-vinylbenzoic acid, 4,4'-stilbendicarboxylic acid, and their derivatives. Among these, the constituent unit derived from 4-vinylbenzoic acid is preferred because it has less steric hindrance and readily interacts with the adherend. These constituent units may be used individually, or two or more may be used in combination.

[0113] More specifically, the above-mentioned constituent units (A-3) and (A-3') include, for example, constituent units derived from dialkoxybenzene or its derivatives (when l and l' are 2), and constituent units derived from trialkoxybenzene or its derivatives (when l and l' are 3).

[0114] Examples of the above-mentioned dialkoxybenzene or its derivatives include 1,2-dimethoxybenzene, 1,3-dimethoxybenzene, and 1,4-dimethoxybenzene. The above-mentioned dialkoxybenzene or its derivatives may be used alone or in combination of two or more types.

[0115] Examples of trialkoxybenzene or its derivatives include 1,2,3-trimethoxybenzene, 1,2,4-trimethoxybenzene, and 1,3,5-trimethoxybenzene. Among these, 1,2,3-trimethoxybenzene is preferred because it has low steric hindrance and readily interacts with the adherend. The above-mentioned trialkoxybenzene or its derivatives may be used alone or in combination of two or more types.

[0116] More specifically, the above-mentioned constituent units (A-4) and (A-4') include, for example, constituent units derived from aminobenzene or its derivatives (when k and k' are 1). Examples of the above-mentioned aminobenzene or its derivatives include aniline, methylaniline, ethylaniline, dimethylaniline, and diethylaniline. The above-mentioned aminobenzene or its derivatives may be used alone or in combination of two or more types.

[0117] The above-mentioned component (A) may consist solely of petroleum-derived materials, but it is preferable that it includes bio-derived materials. The depletion of petroleum resources and the emission of carbon dioxide from the combustion of petroleum-derived products are serious concerns. Therefore, attempts are being made to conserve petroleum resources by using bio-derived materials instead of petroleum-derived materials. It is preferable from the standpoint of conserving petroleum resources if the above-mentioned component (A) includes bio-derived materials. Furthermore, if the above-mentioned component (A) includes bio-derived materials, since bio-derived materials are originally produced by absorbing carbon dioxide from the atmosphere, it is thought that burning them will not increase the total amount of carbon dioxide in the atmosphere, which is also preferable from the standpoint of reducing carbon dioxide emissions. Examples of monomers constituting the above-mentioned constituent unit (A), which includes bio-derived materials, include resorcinol, dihydroxyphenylethylamine hydrochloride, dihydroxyhydrocinnamic acid, dihydroxyphenylalanine, dihydroxybenzaldehyde, dihydroxybenzyl alcohol, pyrogallol, 1,2,4-trihydroxybenzene, phloroglucinol, 6-hydroxy-L-dopa, gallic acid, methyl gallate, butyl gallate, isobutyl gallate, isoamyl gallate, hexadecyl gallate, stearyl gallate, trihydroxyacetophenone, trihydroxybenzaldehyde, trihydroxybenzamide, trihydroxynitrobenzene, and the like.

[0118] The preferred lower limit of the content (on a molar basis) of the constituent unit (A) in the tackifying resin (T2-1) is 1 mol%, and the preferred upper limit is 60 mol%. By having a content of 1 mol% or more of the constituent unit (A), the adhesive strength of the adhesive layer (Y2) can be further improved by blending the tackifying resin (T2-1) into the adhesive composition (X2). By having a content of 60 mol% or less of the constituent unit (A), the tackifying resin (T2-1) will have the preferred physical properties required for a tackifying resin. A more preferred lower limit of the content of the constituent unit (A) is 5 mol%, a more preferred upper limit is 50 mol%, an even more preferred lower limit is 10 mol%, and an even more preferred upper limit is 30 mol%. Furthermore, the preferred lower limit (by mass) of the content ratio (by mass) of the constituent unit (A) in the tackifying resin (T2-1) is 0.9% by mass, and the preferred upper limit is 60% by mass. By having a content ratio of 0.9% by mass or more of the constituent unit (A), the adhesive strength of the adhesive layer (Y2) can be further improved by blending the tackifying resin (T2-1) into the adhesive composition (X2). By having a content ratio of 60% by mass or less of the constituent unit (A), the tackifying resin (T2-1) will have the preferred physical properties required as a tackifying resin. A more preferred lower limit for the content ratio of the constituent unit (A) is 5% by mass, a more preferred upper limit is 50% by mass, an even more preferred lower limit is 10% by mass, and an even more preferred upper limit is 30% by mass.

[0119] Preferably, the tackifying resin (T2-1) further has a constituent unit (B) derived from at least one monomer (b) selected from the group consisting of terpene monomers and vinyl monomers. By having the above constituent unit (B) in the tackifying resin (T2-1), the adhesive strength of the adhesive layer (Y2) can be further improved. Furthermore, from the viewpoint of improving compatibility with the base polymer (P2), the tackifying resin (T2-1) is preferably composed of structural units derived from terpene monomers. Since the structural units derived from terpene monomers have an aliphatic hydrocarbon group having an unsaturated double bond, the compatibility between the tackifying resin (T2-1) and the base polymer (P2) is improved when the tackifying resin (T2-1) has structural units derived from terpene monomers, and a decrease in the adhesive strength of the adhesive layer (Y2) due to deterioration of compatibility can be suppressed.

[0120] Examples of the above-mentioned terpene monomers include α-pinene, β-pinene, limonene, dipentene, δ-3-carene, dimethyloctatriene, allocimene, myrcene, ocimene, linalool, and cosmene. Among these, α-pinene, β-pinene, or limonene are preferred because they can further improve the adhesive strength of the adhesive layer (Y2). As the vinyl monomers mentioned above, vinyl monomers that do not have a structure containing two or more aromatic rings in one molecule (for example, naphthalene structure, anthracene structure, biphenyl structure, anthraquinone structure, benzophenone structure, etc.) are preferred from the viewpoint of improving the compatibility between the tackifying resin (T2-1) and the base polymer (P2). Examples of vinyl monomers that do not have a structure containing two or more aromatic rings in a single molecule include ethylene, propylene, butylene, hexene, vinyl acetate, vinyl chloride, styrene, α-methylstyrene, coumarone, indene, vinyltoluene, divinylbenzene, divinyltoluene, and 2-phenyl-2-butene. Among these, styrene is preferred because it can further improve the adhesive strength of the adhesive layer (Y2). The above monomer (b) may be used alone or in combination of two or more types.

[0121] The above-mentioned component unit (B) may consist solely of petroleum-derived materials, but it is preferable that it includes bio-derived materials. The depletion of petroleum resources and the emission of carbon dioxide from the combustion of petroleum-derived products are serious concerns. Therefore, attempts are being made to conserve petroleum resources by using bio-derived materials instead of petroleum-derived materials. It is preferable from the standpoint of conserving petroleum resources if the above-mentioned component unit (B) includes bio-derived materials. Furthermore, if the above-mentioned component unit (B) includes bio-derived materials, since bio-derived materials are originally produced by absorbing carbon dioxide from the atmosphere, it is thought that burning them will not increase the total amount of carbon dioxide in the atmosphere, which is also preferable from the standpoint of reducing carbon dioxide emissions. Examples of monomers (b) that constitute the above-mentioned constituent unit (B) containing bio-derived materials include terpene monomers, ethylene, propylene, hexene, and the like.

[0122] The preferred lower limit for the content of the constituent unit (B) in the tackifying resin (T2-1) is 40 mol%, and the preferred upper limit is 99 mol%. By having a content of 40 mol% or more of the constituent unit (B), the tackifying resin (T2-1) can have the desirable physical properties required for a tackifying resin. By having a content of 99 mol% or less of the constituent unit (B), the content of the constituent unit (A) can be sufficiently secured, thereby further improving the adhesive strength of the adhesive layer (Y2), and in particular, further improving the adhesive strength even to adherends with low polarity. The more preferred lower limit for the content of the constituent unit (B) is 50 mol%, and the more preferred upper limit is 90 mol%.

[0123] The tackifying resin (T2-1) described above is preferably a copolymer having a structure represented by the following formula. In particular, when the above constituent unit (A) is present in or at the end of the main chain skeleton, it is preferable that the copolymer has a structure represented by the following formula. Copolymers having such a structure are obtained by a cationic polymerization method as described later, and can further improve the adhesive strength of the adhesive layer (Y2), and in particular can further improve the adhesive strength even to low-polarity adherends.

[0124] [ka]

[0125] In the formula, A represents a constituent unit (A), B represents a constituent unit (B), and s and t each represent an integer greater than or equal to 1. * represents a connection.

[0126] The tackifying resin (T2-1) is preferably a copolymer having the above-mentioned structural unit (A) and the above-mentioned structural unit (B), and may further have other structural units. When the tackifying resin (T2-1) is a copolymer having the above-mentioned structural unit (A) and the above-mentioned structural unit (B), the above-mentioned structural unit (A) and the above-mentioned structural unit (B) may be copolymerized randomly, or they may be copolymerized in a regular or periodic manner, for example, when each forms a block segment and the block segments are bonded to each other.

[0127] The tackifying resin (T2-1) preferably has an aliphatic hydrocarbon group having an unsaturated double bond. The tackifying resin (T2-1) may have the aliphatic hydrocarbon group having an unsaturated double bond in the constituent unit (A) or the constituent unit (B), or in other constituent units. In particular, from the viewpoint of ease of synthesis and improving the compatibility between the tackifying resin (T2-1) and the base polymer (P2), and especially between the tackifying resin (T2-1) and the styrene elastomer, it is preferable that the aliphatic hydrocarbon group having an unsaturated double bond is present in the constituent unit (B) or other constituent units. The constituent unit (B) or other constituent units having such aliphatic hydrocarbon group having an unsaturated double bond are not particularly limited, but it is preferable that the constituent unit (B) is derived from at least one monomer (b) selected from the group consisting of terpene monomers and vinyl monomers. In other words, it is preferable that the tackifying resin (T2-1) has the aliphatic hydrocarbon group having an unsaturated double bond in a constituent unit (B) derived from at least one monomer (b) selected from the group consisting of terpene monomers and vinyl monomers. In particular, it is preferable that the aliphatic hydrocarbon group having an unsaturated double bond is contained in a constituent unit derived from a terpene monomer, as this can further improve the adhesive strength of the adhesive layer (Y2).

[0128] Other constituent units mentioned above include, for example, constituent units derived from other phenolic monomers not included in constituent unit (A), and constituent units derived from maleic anhydride. Other phenolic monomers mentioned above include, for example, phenol, cresol, xylenol, propylphenol, norylphenol, methoxyphenol, bromophenol, bisphenol A, bisphenol F, bisphenol S, and dihydroxynaphthalene. The other phenolic monomers mentioned above may be used individually or in combination of two or more.

[0129] The preferred lower limit of the weight-average molecular weight (Mw) of the above tackifying resin (T2-1) is 400, and the preferred upper limit is 10,000. When the weight-average molecular weight (Mw) of the above tackifying resin (T2-1) is within this range, the above tackifying resin (T2-1) possesses the desirable physical properties required for a tackifying resin. A more preferred lower limit of the weight-average molecular weight (Mw) of the above tackifying resin (T2-1) is 500, a more preferred upper limit is 5000, an even more preferred lower limit is 700, and an even more preferred upper limit is 3000. Methods for adjusting the weight-average molecular weight (Mw) to the above range include, for example, adjusting the composition, polymerization method, and polymerization conditions of the tackifying resin (T2-1).

[0130] The preferred lower limit of the Young's modulus of the tackifying resin (T2-1) at 25°C is 10 MPa. A Young's modulus of 10 MPa or higher at 25°C for the tackifying resin (T2-1) provides appropriate hardness and desirable physical properties required for a tackifying resin. A more preferred lower limit for the Young's modulus of the tackifying resin (T2-1) at 25°C is 50 MPa, and an even more preferred lower limit is 70 MPa. Furthermore, from the viewpoint of preventing the adhesive layer (Y2) from becoming too hard and reducing the adhesive strength, the preferred upper limit for the Young's modulus of the tackifying resin (T2-1) at 25°C is 10,000 MPa, and the more preferred upper limit is 5,000 MPa. The Young's modulus of the tackifying resin (T2-1) at 25°C can be measured by performing a tensile test using a tensile testing machine (such as the "Autograph" manufactured by Shimadzu Corporation) under the conditions of a tensile speed of 200 mm / min, a grip distance of 15 mm, and a temperature of 25°C. A sample for this measurement can be obtained, for example, by filling a mold measuring 10 × 50 mm with the tackifying resin (T2-1) and melting it at a temperature 100°C higher than the glass transition temperature to produce a test piece with a thickness of 1 mm.

[0131] Methods for adjusting the Young's modulus of the tackifying resin (T2-1) at 25°C to within the above range include, for example, adjusting the molecular weight or weight-average molecular weight of the tackifying resin (T2-1), the composition and content ratio of the constituent units (A) and (B) in the tackifying resin (T2-1), etc.

[0132] The preferred lower limit for the glass transition temperature of the tackifying resin (T2-1) is 0°C, and the preferred upper limit is 200°C. Because the glass transition temperature of the tackifying resin (T2-1) is within this range, the Young's modulus of the tackifying resin (T2-1) at 25°C is easily adjusted to within this range, thus the tackifying resin (T2-1) possesses the desirable physical properties required for a tackifying resin. A more preferred lower limit for the glass transition temperature of the tackifying resin (T2-1) is 10°C, and a more preferred upper limit is 150°C.

[0133] The preferred lower limit of the iodine value of the tackifying resin (T2-1) is 2.0 g / 100 g, and the preferred upper limit is 180 g / 100 g. Having an iodine value of 2.0 g / 100 g or higher makes it easier to suppress the decrease in adhesive strength of the adhesive layer (Y2) caused by poor compatibility between the tackifying resin (T2-1) and the base polymer (P2). Having an iodine value of 180 g / 100 g or lower further improves the adhesive strength of the adhesive layer (Y2), and in particular, it can further improve adhesive strength even to low-polarity substrates. A more preferred lower limit of the iodine value of the tackifying resin (T2-1) is 70 g / 100 g, and a more preferred upper limit is 170 g / 100 g. The iodine value is an indicator of the amount of unsaturated double bonds (C=C bond amount), and refers to the value measured in accordance with the method described in "JIS K 0070:1992".

[0134] The preferred lower limit for the content of bio-derived carbon (carbon atoms) in the carbon (carbon atoms) of the above-mentioned tackifying resin (T2-1) is 10%. A bio-derived carbon content of 10% or more is an indicator that a product is "bio-based". The above tackifying resin (T2-1) is preferable if it contains 10% or more bio-derived carbon, from the viewpoint of conserving petroleum resources and reducing carbon dioxide emissions. A more preferable lower limit for the bio-derived carbon content of the above tackifying resin (T2-1) is 30%, an even more preferable lower limit is 60%, an even more preferable lower limit is 70%, and a particularly preferable lower limit is 90%. There is no particular preferred upper limit for the bio-derived carbon content of the above tackifying resin (T2-1), and it may be 100%. Furthermore, while bio-derived carbon contains a certain percentage of the radioactive isotope (C-14), petroleum-derived carbon contains almost no C-14. Therefore, the percentage of bio-derived carbon in the above-mentioned tackifying resin (T2-1) can be calculated by measuring the concentration of C-14 contained in the compound. Specifically, this can be measured in accordance with ASTM D6866-22, a standard widely used in the bioplastics industry.

[0135] The tackifying resin (T2-1) described above also includes hydrogenated compounds of the compounds mentioned above. A hydrogenated compound is a compound in which at least partially the carbon-carbon double bonds present in the tackifying resin (T2-1) described above have been saturated by hydrogenation. That is, the adhesive composition (X2) may contain a hydrogenated compound in which some of the carbon-carbon double bonds in the tackifying resin (T2-1) have been hydrogenated, or it may contain a hydrogenated compound in which all of the carbon-carbon double bonds in the tackifying resin (T2-1) have been hydrogenated. Even such a hydrogenated compound can be suitably used as a tackifying resin to be blended into the adhesive composition (X2), and can improve the adhesive strength of the adhesive layer (Y2), and in particular can improve the adhesive strength even to adherends with low polarity.

[0136] The method for producing the tackifying resin (T2-1) described above is not particularly limited, but when the constituent unit (A) is present in or at the end of the main chain skeleton, the following method is preferred, for example. In other words, a method of copolymerizing monomer (a) constituting the above-mentioned structural unit (A) with at least one monomer (b) selected from the group consisting of terpene monomers and vinyl monomers constituting the above-mentioned structural unit (B) (hereinafter also referred to as "production method [I]") is preferred.

[0137] The monomer (a) is preferably at least one selected from the group consisting of monomer (a-1), monomer (a-2), monomer (a-3), and monomer (a-4), which are represented by the following formula.

[0138] [ka]

[0139] [ka]

[0140] [ka]

[0141] [ka]

[0142] In formulas (a-1) to (a-4), R 1 ~R 7 Each of the following represents a hydrogen atom, an aliphatic hydrocarbon group, an aromatic hydrocarbon group, a polar functional group, an aliphatic hydrocarbon group having a polar functional group, or an aromatic hydrocarbon group having a polar functional group. n'' represents an integer between 2 and 5, preferably 2 or 3, and more preferably 3. m'' represents an integer between 1 and 5. l'' represents an integer between 2 and 5. k'' represents an integer between 1 and 5.

[0143] In the method for producing the tackifying resin (T2-1) described above [I], it is preferable to copolymerize monomer (a) and monomer (b) by cationic polymerization. By using the cationic polymerization described above, monomer (a) and monomer (b) can be copolymerized without prior chemical modification to protect the functional groups of monomer (a), such as phenolic hydroxyl groups, carboxyl groups, alkoxy groups, and amino groups, and subsequent deprotection is also unnecessary. Therefore, monomer (a) and monomer (b) can be copolymerized in a simpler one-step reaction process, leading to a reduction in impurities and an improvement in yield.

[0144] A preferred method for copolymerizing monomer (a) and monomer (b) by cationic polymerization is to react monomer (a) and monomer (b) in the presence of a Lewis acid. This method is thought to generate cations of monomer (b), leading to cationic polymerization between monomers (b) and a Fridel-Crafts alkylation reaction between monomer (a) and monomer (b). Repeated reactions of this nature allow for the production of a copolymer having constituent units (A) derived from monomer (a) and constituent units (B) derived from monomer (b). The Lewis acid mentioned above is not particularly limited, and conventionally known Lewis acids can be used, such as aluminum chloride (AlCl3), diethylaluminum chloride (Et2AlCl2), tin(IV) chloride (SnCl4), titanium(IV) chloride (TiCl4), boron trichloride (BCl3), and boron trifluoride ether complex (BF3·EtO). Among these, aluminum chloride (AlCl3) is preferred because it yields a higher yield of copolymer.

[0145] More specifically, for example, if pyrogallol is used as monomer (a) and α-pinene is used as monomer (b), and these are reacted in the presence of aluminum chloride (AlCl3), which is a Lewis acid, the reaction shown in the following scheme is expected to proceed. Specifically, a cation of monomer (b), α-pinene, is generated, and cationic polymerization of α-pinenes proceeds (upper part of the scheme below), while a Fridel-Crafts alkylation reaction proceeds between monomer (a), pyrogallol, and monomer (b), α-pinene (middle part of the scheme below). By repeatedly performing such reactions, a copolymer having structural units derived from pyrogallol and structural units derived from α-pinene can be obtained (lower part of the scheme below). Such a copolymer will have structural units derived from pyrogallol in the main chain skeleton or at the ends of the main chain skeleton.

[0146] [ka]

[0147] In the expression, s and t each represent an integer greater than or equal to 1. * represents a concatenation.

[0148] As for the method of producing the above-mentioned tackifying resin (T2-1), if the above-mentioned structural unit (A) is present in the side chain, for example, the following method is preferred. In other words, a method of copolymerizing a monomer (a') obtained by introducing an unsaturated double bond to monomer (a) constituting the above-mentioned structural unit (A), with at least one monomer (b) selected from the group consisting of terpene monomers and vinyl monomers constituting the above-mentioned structural unit (B) (hereinafter also referred to as "production method [II]") is preferred.

[0149] Examples of the above monomer (a') include 2-vinylbenzoic acid, 3-vinylbenzoic acid, 4-vinylbenzoic acid, and 4,4'-stilbendicarboxylic acid. Among these, 4-vinylbenzoic acid is preferred because it has less steric hindrance and readily interacts with the adherend. The above monomer (a') may be used alone or in combination of two or more types.

[0150] In the above method for producing the tackifying resin (T2-1) [II], it is preferable to copolymerize the monomer (a') and the monomer (b) by cationic polymerization, similar to the method for producing the tackifying resin (T2-1) [I]. A preferred method for copolymerizing monomer (a') and monomer (b) by cationic polymerization is to react monomer (a') and monomer (b) in the presence of a Lewis acid as described above. By such a method, cationic polymerization proceeds between the unsaturated double bond in monomer (a') and the unsaturated double bond in monomer (b), and a copolymer having constituent units (A) derived from monomer (a') and constituent units (B) derived from monomer (b) can be obtained.

[0151] The above-mentioned tackifying resin (T2-1) can improve the adhesive strength of the adhesive layer (Y2) even in a small amount compared to conventional tackifying resins. The preferred lower limit of the content of the above-mentioned tackifying resin (T2-1) per 100 parts by mass of the above-mentioned base polymer (P2) is 5 parts by mass, and the preferred upper limit is 30 parts by mass. By having a content of 5 parts by mass or more of the above-mentioned tackifying resin (T2-1), the adhesive strength of the adhesive layer (Y2) can be further improved, and in particular, the adhesive strength to low-polarity adherends (e.g., fluororesins, etc.) can be further improved. By having a content of 30 parts by mass or less of the above-mentioned tackifying resin (T2-1), a decrease in adhesive strength caused by the adhesive layer (Y2) becoming too hard can be suppressed. The more preferred lower limit of the content of the above-mentioned tackifying resin (T2-1) is 10 parts by mass, and the more preferred upper limit is 20 parts by mass.

[0152] The tackifying resin preferably includes at least one tackifying resin (T2-2) selected from the group consisting of rosin ester resins, terpene resins, terpene phenol resins, and petroleum resins. By including the tackifying resin (T2-2), the adhesive strength of the adhesive layer (Y2) can be further improved. In particular, the tackifying resin (T2-2) is more preferably made up of at least one tackifying resin selected from the group consisting of rosin ester resins and terpene resins because it can further improve the adhesive strength to low-polarity adherends (e.g., fluororesins, etc.), and the tackifying resin (T2-2) is even more preferably made up of a rosin ester resin because it can further improve the adhesive strength to low-polarity adherends (e.g., fluororesins, etc.). Examples of the above-mentioned rosin ester resin, terpene resin, terpene phenol resin, and petroleum resin include those similar to those used in the tackifying resin (T1) described above.

[0153] The preferred lower limit for the content of the tackifying resin (T2-2) per 100 parts by mass of the base polymer (P2) is 10 parts by mass, and the preferred upper limit is 100 parts by mass. A content of 10 parts by mass or more of the tackifying resin (T2-2) can further improve the adhesive strength of the adhesive layer (Y2). A content of 100 parts by mass or less of the tackifying resin (T2-2) can prevent the adhesive layer (Y2) from becoming too hard and reducing its adhesive strength. A more preferred lower limit for the content of the tackifying resin (T2-2) is 15 parts by mass, a more preferred upper limit is 60 parts by mass, an even more preferred upper limit is 50 parts by mass, and an even more preferred upper limit is 40 parts by mass.

[0154] The adhesive composition (X2) preferably contains a crosslinking agent. In particular, if the base polymer (P2) contains the (meth)acrylic copolymer, the adhesive composition (X2) preferably contains a crosslinking agent. By containing the crosslinking agent in the adhesive composition (X2), the (meth)acrylic copolymer can form a crosslinked structure by chemical crosslinking, thereby improving the bulk cohesive force of the adhesive layer (Y2) and increasing the gel fraction of the adhesive layer (Y2), as described later, thus improving the adhesive strength of the resulting adhesive tape. Furthermore, from the viewpoint of storage stability and other factors, the crosslinking agent may be added to the adhesive composition (X2) immediately before forming the adhesive layer (Y2).

[0155] Examples of the crosslinking agents include isocyanate-based crosslinking agents, aziridine-based crosslinking agents, epoxy-based crosslinking agents, and metal chelate-type crosslinking agents. In particular, it is preferable that the crosslinking agent includes at least one selected from the group consisting of isocyanate-based crosslinking agents and epoxy-based crosslinking agents, as this enables appropriate chemical crosslinking of the (meth)acrylic copolymer and further improves the adhesive strength of the adhesive layer (Y2). Examples of the above-mentioned isocyanate-based crosslinking agent and epoxy-based crosslinking agent include those the same as those used in the above-mentioned adhesive composition (X1).

[0156] The preferred lower limit for the content of the crosslinking agent in the above adhesive composition (X2) per 100 parts by mass of the (meth)acrylic copolymer is 0.01 parts by mass, and the preferred upper limit is 20 parts by mass. Having the crosslinking agent content within this range allows for appropriate chemical crosslinking of the (meth)acrylic copolymer, further improving the adhesive strength of the adhesive layer (Y2). A more preferred lower limit for the crosslinking agent content is 0.1 parts by mass, a more preferred upper limit is 10 parts by mass, an even more preferred lower limit is 0.5 parts by mass, and an even more preferred upper limit is 8.0 parts by mass.

[0157] The above adhesive composition (X2) may further contain a coloring agent for the purpose of providing light-shielding properties. Examples of the coloring agent include carbon black, aniline black, and titanium dioxide. Among these, carbon black is preferred because it is relatively inexpensive and chemically stable.

[0158] The above adhesive composition (X2) may optionally contain conventionally known fine particles and additives such as inorganic fine particles, conductive fine particles, antioxidants, foaming agents, organic fillers, and inorganic fillers.

[0159] The preferred lower limit for the gel fraction of the adhesive layer (Y2) is 15% by mass, and the preferred upper limit is 60% by mass. When the gel fraction of the adhesive layer (Y2) is 15% by mass or more, the bulk strength of the adhesive layer (Y2) is increased, and the resulting adhesive tape has superior adhesion. When the gel fraction of the adhesive layer (Y2) is 60% by mass or less, the flexibility of the adhesive layer (Y2) is further improved, and the adhesion strength of the adhesive layer (Y2) to the fluororesin is further improved. The more preferred lower limit for the gel fraction of the adhesive layer (Y2) is 25% by mass, and the more preferred upper limit is 50% by mass. The gel fraction of the adhesive layer (Y2) can be measured using the same method as described above for the gel fraction of the adhesive layer (Y1).

[0160] The gel fraction of the adhesive layer (Y2) can be adjusted to within the above range by, for example, changing the type or constituent units of the base polymer (P2) (for example, changing the type of monomer constituting the (meth)acrylic copolymer), adjusting the content ratio of the base polymer (P1), adjusting the weight-average molecular weight of the base polymer (P2), adjusting the type and content of the crosslinking agent, etc.

[0161] The adhesive layer (Y2) described above has a preferred lower limit of 5.0 N / 25 mm for its 180° peel strength against PTFE at 23°C. The adhesive tape of the present invention exhibits excellent adhesion to fluororesins due to the adhesive layer (Y2) having a 180° peel strength of 5.0 N / 25 mm or higher for PTFE at 23°C. A more preferred lower limit for the adhesive layer (Y2)'s 180° peel strength against PTFE at 23°C is 7.0 N / 25 mm, and an even more preferred lower limit is 10 N / 25 mm. Furthermore, there is no particular preferred upper limit for the 180° peel force of the adhesive layer (Y2) against PTFE at 23°C, but the practical upper limit is 100 N / 25 mm.

[0162] The 180° peel force of the above adhesive layer (Y2) against PTFE at 23°C can be measured by the following method. Specifically, an adhesive tape backed with the adhesive layer (Y1) using a 50 μm thick PET film is cut to a size of 25 mm wide x 100 mm long. Then, the adhesive layer (Y2) side is placed on a 2 mm thick polytetrafluoroethylene board (for example, "Yodoflon" manufactured by Yodogawa Hutech Co., Ltd.), and pressed together by one back-and-forth motion using a 2 kg rubber roller at a speed of 300 mm / min. After that, the laminate A is produced by curing it for 24 hours in an environment of 23°C and 50% RH. A 180° peel test is performed on the obtained laminate A using a tensile testing machine ("Autograph" manufactured by Shimadzu Corporation, etc.) in accordance with JIS Z 0237, under conditions of 23°C, 50% RH, and a peeling speed of 300 mm / min. By peeling the adhesive tape from the polytetrafluoroethylene board, the 180° peel force of the adhesive layer (Y2) against PTFE at 23°C can be measured.

[0163] Methods for adjusting the 180° peel force of the adhesive layer (Y2) to PTFE at 23°C to within the range described above include, for example, changing the type or constituent units of the base polymer (P2) (for example, changing the copolymerization ratio or monomer composition of the base polymer (P2)), adjusting the type or content of the tackifying resin (T2), changing the thickness of the adhesive layer (Y2), or changing the substrate.

[0164] The preferred lower limit for the thickness of the adhesive layer (Y2) is 50 μm, and the preferred upper limit is 1000 μm. The adhesive layer (Y2) having a thickness within this range ensures sufficient adhesive strength. A more preferred lower limit for the thickness of the adhesive layer (Y2) is 100 μm, a more preferred upper limit is 500 μm, and an even more preferred upper limit is 300 μm.

[0165] The above-mentioned double-sided adhesive tape may have layers other than the adhesive layer, as long as it does not impair the effects of the present invention.

[0166] The above-mentioned double-sided adhesive tape preferably has a base material. Having a base material in the double-sided adhesive tape results in an adhesive tape with superior bonding workability.

[0167] From the viewpoint of heat resistance and chemical resistance, the above-mentioned substrate preferably contains at least one selected from the group consisting of polyester resin, polyimide resin, polyether resin, polyolefin resin, polyurethane resin, metal, glass fiber, and carbon fiber.

[0168] Examples of the polyester resins mentioned above include polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyethylene furanoate (PEF), polylactic acid (PLA), and polybutylene succinate (PBS). Examples of the polyimide resins mentioned above include Kapton (manufactured by DuPont) and Upirex (manufactured by UBE). Examples of the polyether resins mentioned above include polyetheretherketone (PEEK) and polyetherimide (PEI). Examples of the polyolefin resins mentioned above include polyethylene (PE), polypropylene (PP), and ethylene-vinyl acetate copolymer (EVA). The polyurethane resin described above is a resin composition comprising a polyisocyanate and a polyol. Examples of the polyisocyanate include 4,4'-diphenylmethane diisocyanate (MDI), and examples of the polyol include polypropylene glycol (PPG). Examples of the above-mentioned metals include stainless steel (SUS), copper, and aluminum. Examples of the glass fibers mentioned above include glass cloth. Examples of the carbon fibers mentioned above include carbon cloth.

[0169] Furthermore, the generation of air at the adhesive surface when the above-mentioned substrate is pressed against the adhesive layer can cause the adhesive layer to peel off easily. Therefore, it is preferable that the above-mentioned substrate includes at least one shape selected from the group consisting of nonwoven fabrics and woven fabrics, as this improves the anchoring strength of the substrate and improves air release properties by providing air passages to suppress air generation, thereby suppressing the peeling of the adhesive layer.

[0170] Examples of commercially available nonwoven fabric-like base materials include G2260-1S (manufactured by Toray International, Inc.). Examples of the woven base material mentioned above include glass cloth and carbon cloth. Examples of commercially available glass cloths among those mentioned above include KS2770 (manufactured by Nitto Boseki Co., Ltd.) and L73A×1045 (manufactured by Arisawa Seisakusho Co., Ltd.). Among the carbon cloths mentioned above, commercially available examples include C-540 (manufactured by Hagiwara Industries Co., Ltd.).

[0171] The preferred lower limit for the thickness of the above-mentioned substrate is 50 μm, and the preferred upper limit is 1000 μm. Having the substrate thickness within this range further improves the interlayer strength of the double-sided adhesive tape. A more preferred lower limit for the thickness of the above-mentioned substrate is 100 μm, and a more preferred upper limit is 500 μm.

[0172] The above double-sided adhesive tape has a minimum thickness of 250 μm. A thickness of 250 μm or more allows the double-sided adhesive tape to achieve a high level of both adhesive strength and ease of application. A preferred minimum thickness for the above double-sided adhesive tape is 300 μm, and a more preferred minimum thickness is 400 μm. Furthermore, from the viewpoint of preventing the load due to the weight of the double-sided adhesive tape from becoming too large, the preferred upper limit for the thickness of the double-sided adhesive tape is 1200 μm, and the more preferred upper limit is 1000 μm.

[0173] When the above double-sided adhesive tape includes a base material, the preferred upper limit of the ratio of the thickness of the base material to the thickness of the double-sided adhesive tape is 35%. A ratio of 35% or less for the base material results in superior adhesive reliability for the double-sided adhesive tape. A more preferred upper limit for the ratio of the base material thickness is 30%, and an even more preferred upper limit is 25%. Furthermore, from the viewpoint of increasing the overall strength of the tape by the base material, the preferred lower limit for the ratio of the base material thickness is 1%, and the more preferred lower limit is 3%.

[0174] The method for manufacturing the laminated sheet in the wound body of the present invention 1 is not particularly limited, and examples include the following methods. First, an adhesive solution (a) containing an adhesive composition (X1) is prepared by adding a base polymer (P1), a tackifying resin (T1), and, if necessary, a crosslinking agent or solvent. The obtained adhesive solution (a) is applied to the release layer of a separator such as a release PET film, and the solvent in the solution is dried and removed to create a laminated film in which an adhesive layer (Y1) is formed on the separator. Next, the prepared laminated film is superimposed on a substrate so that the adhesive layer (Y1) and the substrate face each other, thereby obtaining a laminate of the substrate and a substrate having an adhesive layer (Y1) on one side of the substrate. Note that the step of applying the adhesive solution (a) to the separator may be completed in one step, or it may be performed multiple times by applying it on top of the applied adhesive solution. By adjusting the number of application steps, the thickness of the adhesive layer (Y1) can be easily adjusted. Furthermore, an adhesive solution (b) containing an adhesive composition (X2) is prepared by adding a base polymer (P2), a tackifying resin (T2), and, if necessary, a crosslinking agent or solvent. The obtained adhesive solution (b) is applied to any separator, and the solvent in the solution is dried and removed to form an adhesive layer (Y2). The step of applying the adhesive solution (b) to the separator may be performed once, or it may be performed multiple times by applying it on top of the applied adhesive solution. By adjusting the number of application steps, the thickness of the adhesive layer (Y2) can be easily adjusted. Then, by overlapping the substrate of the laminate containing the adhesive layer (Y1) with the adhesive layer (Y2) so that they face each other, peeling off the separator that protects the adhesive layer (Y2), and curing for 48 hours in an environment of 40°C and 50%RH, a laminated sheet can be manufactured having a double-sided adhesive tape having the adhesive layer (Y1), the adhesive layer (Y2), and the substrate, and a separator that protects the adhesive layer (Y1) of the double-sided adhesive tape.

[0175] Furthermore, the method for manufacturing the laminated sheet in the wound body of the present invention 2 is not particularly limited, and examples include the following methods. First, an adhesive solution (a) containing an adhesive composition (X1) is prepared by adding a base polymer (P1), a tackifying resin (T1), and, if necessary, a crosslinking agent or solvent. The obtained adhesive solution (a) is applied to the release layer of a separator such as a release PET film, and the solvent in the solution is dried and removed to create a laminated film in which an adhesive layer (Y1) is formed on the separator. The prepared laminated film is placed on a substrate so that the adhesive layer (Y1) and the substrate face each other, and cured for 48 hours in an environment of 40°C and 50%RH to obtain a laminate having an adhesive layer (Y1) on one side of the substrate. Note that the step of applying the adhesive solution (a) to the separator may be completed in one step, or it may be performed multiple times by applying it on top of the applied adhesive solution. By adjusting the number of application steps, the thickness of the adhesive layer (Y1) can be easily adjusted. Furthermore, an adhesive solution (b) containing an adhesive composition (X2) is prepared by adding a base polymer (P2), a tackifying resin (T2), and, if necessary, a crosslinking agent or solvent. The obtained adhesive solution (b) is applied to the release layer of a separator such as a release PET film, and the solvent in the solution is dried and removed to create a laminated film in which an adhesive layer (Y2) is formed on the separator. Note that the step of applying the adhesive solution (b) to the separator may be performed once, or it may be performed multiple times by applying it on top of the applied adhesive solution. By adjusting the number of application steps, the thickness of the adhesive layer (Y2) can be easily adjusted. By overlapping a base material and a laminate having an adhesive layer (Y1) on one side of the base material, with the side of the base material without the adhesive layer (Y1) facing the adhesive layer (Y2) of a laminated film having an adhesive layer (Y2) formed on a separator, and curing for 48 hours in an environment of 40°C and 50%RH, a laminated sheet can be manufactured having a double-sided adhesive tape having an adhesive layer (Y1), an adhesive layer (Y2), and a base material, and a laminated sheet having separators on both sides of the double-sided adhesive tape.

[0176] The laminated sheet described above has a minimum thickness of 350 μm. A thickness of 350 μm or more in the laminated sheet of the present invention improves the peelability of the separator, making it easier to peel off the double-sided adhesive tape. A preferred minimum thickness for the laminated sheet of the present invention is 375 μm, and a more preferred minimum thickness is 400 μm. Furthermore, from the viewpoint of preventing excessive load due to the self-weight of the laminated sheet of the present invention, a preferred upper limit for the thickness of the laminated sheet of the present invention is 1400 μm, and a more preferred upper limit is 1300 μm.

[0177] From the viewpoint of being able to be manufactured using a roll-to-roll method, the laminated sheet is preferably in a long shape. The length of the laminated sheet is not particularly limited, but a preferred lower limit for the length of the laminated sheet is 10m, and a more preferred lower limit is 20m. Furthermore, from the viewpoint of weight when formed into a wound body, the preferred upper limit for the length of the laminated sheet is 100m, and the more preferred upper limit is 50m.

[0178] The width of the laminated sheet is not particularly limited, but from the viewpoint of manufacturing efficiency, the preferred lower limit of the width of the laminated sheet is 300 mm, the preferred upper limit is 2100 mm, the more preferred lower limit is 500 mm, and the more preferred upper limit is 1500 mm.

[0179] The method for manufacturing the winding body of the present invention is not particularly limited, and it can be manufactured by winding a laminated sheet onto a winding core using a conventionally known method.

[0180] The applications of the winding body of the present invention are not particularly limited, but it is suitably used for joining fluororesin to dissimilar members for various purposes. More specifically, these purposes include, for example, promoting sliding of friction surfaces, preventing friction of sliding parts, insulating coating, and protecting adherends from high temperatures or chemical solutions. In particular, it is suitably used for protecting adherends, and especially suitably for protecting adherends from chemical solutions. Furthermore, the double-sided adhesive tape in the winding body of the present invention has excellent adhesive reliability and can provide high-strength adhesion, making it suitably used for lining (surface treatment covering the inner surface of a tank) on the body of a chemical solution tank, and even more suitably used for lining on the body of a chemical solution tank for semiconductors or the chemical industry. The double-sided adhesive tape with separator of the present invention has excellent adhesive reliability when bonding fluororesin to a tank, etc., so lining of the tank can be performed without problems. In addition, the winding body of the present invention has less tunneling and is easy to handle when removing the double-sided adhesive tape. Furthermore, the double-sided adhesive tape in the winding body of the present invention makes it easier to suppress the peeling of the separator from the other adhesive layer when one adhesive layer is bonded to the fluororesin, and makes it easier to bond the fluororesin to the can body, etc.

[0181] In the case where the double-sided adhesive tape of the laminated sheet in the winding body of the present invention has the adhesive layer (Y2), the present invention also includes a lining sheet manufacturing step of pressing a sheet containing fluororesin onto the adhesive layer (Y2) of the double-sided adhesive tape in the winding body of the present invention; a separator peeling step of peeling off the separator on the adhesive layer (Y1) side from the lining sheet manufactured in the lining sheet manufacturing step to expose the adhesive layer (Y1); and a lining sheet lamination step of laminating the adhesive layer (Y1) to the inside of the can body of the chemical tank. The present invention provides a method for manufacturing a chemical tank that suppresses the peeling of the separator of the laminated sheet when pressing a sheet containing fluororesin, and allows for easy bonding of the fluororesin to the tank body, resulting in superior work efficiency.

[0182] Examples of sheets containing the fluororesin used in the lining sheet manufacturing process include sheets containing polytetrafluoroethylene (PTFE), sheets containing perfluoroalkoxyalkane (PFA), sheets containing perfluoroethylenepropene copolymer (FEP), sheets containing ethylenetetrafluoroethylene copolymer (ETFE), sheets containing polyvinylidene fluoride (PVDF), sheets containing polyvinyl fluoride (PVF), sheets containing polychlorotrifluoroethylene (PCTFE), and sheets containing ethylenechlorotrifluoroethylene copolymer (ECTFE). Among these, sheets containing PTFE are preferred because they offer excellent heat resistance and chemical resistance. The sheet containing the above-mentioned fluororesin may be a single layer or a multi-layered sheet of two or more layers.

[0183] The sheet containing the above-mentioned fluororesin preferably has an easy-adhesion treatment layer on its surface. By having an easy-adhesion treatment layer on its surface, the lining sheet produced in the lining sheet manufacturing process exhibits excellent adhesion between the adhesive layer (Y2) and the sheet containing the fluororesin, enabling the fluororesin to be firmly bonded to the tank body of the chemical tank.

[0184] From the viewpoint of further improving the adhesion between the adhesive layer (Y2) and the sheet containing the fluororesin, the easy-adhesion treatment in the easy-adhesion treatment layer preferably includes at least one treatment selected from the group consisting of plasma irradiation, electron beam irradiation, chemical etching, and easy-adhesion layer bonding treatment.

[0185] Examples of the above-mentioned chemical etching treatments include sodium etching.

[0186] Examples of the above-mentioned easy-adhesion layer bonding treatment include an easy-adhesion layer bonding treatment using a sheet containing fluororesin, and specific examples of the easy-adhesion layer bonding treatment using a sheet containing fluororesin include glass backing treatment and carbon cloth backing treatment. Glass backing and carbon cloth backing can be performed, for example, by laminating another sheet containing fluororesin and glass cloth or carbon cloth in that order onto one surface of a sheet containing fluororesin, and then pressing them in a high-temperature environment. In the easy-adhesion layer bonding treatment using the above-mentioned fluororesin-containing sheet, the fluororesin-containing sheet can be any sheet containing the fluororesin described above, but it is preferable to use a sheet containing a thermoplastic fluororesin.

[0187] The thickness of the resin sheet containing the above-mentioned fluororesin is preferably 1.0 mm at the lower limit and preferably 4.0 mm at the upper limit. A thickness of 1.0 mm or more for the resin sheet containing the above-mentioned fluororesin further improves chemical resistance. A thickness of 4.0 mm or less for the resin sheet containing the above-mentioned fluororesin suppresses tunneling when winding the laminated sheet, further improving the handling of the winded body of the present invention. A more preferable lower limit for the thickness of the resin sheet containing the above-mentioned fluororesin is 1.5 mm, and a more preferable upper limit is 3.5 mm.

[0188] The surface density of the resin sheet containing the above-mentioned fluororesin is preferably at a lower limit of 1 kg / m². 2 Therefore, the preferred upper limit is 10 kg / m 2 The surface density of the resin sheet containing the above-mentioned fluororesin is 1 kg / m². 2 As a result, chemical resistance is further improved. The surface density of the resin sheet containing the above fluororesin is 10 kg / m². 2 The following conditions make it possible to suppress tunneling when winding the laminated sheet, thereby further improving the handling of the winding body of the present invention. A more preferable lower limit for the surface density of the resin sheet containing the fluororesin is 2 kg / m².2 A more preferable upper limit is 8 kg / m 2 That is the case.

[0189] A chemical tank in which the double-sided adhesive tape of the laminated sheet of the present invention is attached to the inner surface of a can is also one of the present inventions. The chemical tank of the present invention allows for a strong bond of fluororesin to the inner surface of the tank body via the attached double-sided adhesive tape, thereby further suppressing peeling and lifting of the fluororesin caused by the chemical solution stored in the chemical tank to which the fluororesin is bonded. [Effects of the Invention]

[0190] According to the present invention, it is possible to provide a wound material that has excellent adhesive reliability for bonding fluororesin to a can or the like, has less floating (tunneling), and is easy to handle. Furthermore, according to the present invention, it is possible to provide a method for manufacturing a chemical tank using the wound material. Moreover, according to the present invention, it is possible to provide a chemical tank with double-sided adhesive tape attached to the wound material. [Modes for carrying out the invention]

[0191] The embodiments of the present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0192] (Preparation of release agent solution) (Release agent solution 1) To 100 parts by mass of silicone composition (Toray Dow Corning, "LTC759"), 1 part by mass of curing catalyst (Toray Dow Corning, "SRX212") and 900 parts by mass of toluene as a solvent were added and thoroughly stirred to prepare mold release agent solution 1.

[0193] (Release agent solution 2-5) Release agent solutions 2 to 5 were prepared in the same manner as release agent solution 1, except that their compositions were as shown in Table 1. [Table 1]

[0194] (Production of separator) (Separator G) On the surface of a 75-μm thick PET film (manufactured by Toyobo Co., Ltd., "S10") prepared as a separator substrate, release agent solution 3 was applied so that the dried thickness became 0.5 μm, and then dried at 130°C for 1 minute to form a release layer. Next, release agent solution 1 was applied to the back surface of the PET film having a release layer formed on the surface so that the dried thickness became 0.5 μm, and then dried at 130°C for 1 minute, thereby producing separator G having release layers with a thickness of 0.5 μm on both sides of the PET film.

[0195] (Separators H - I) Except that the type of the separator substrate and the type of the release agent solution were those shown in Table 2, separators H - I having release layers on both sides of the separator were produced in the same manner as separator G.

[0196] (Separators K - M, O)[[ID=I8]] Except that the type of the separator substrate and the type of the release agent solution were those shown in Table 2 and a release layer was formed only on the surface of the separator substrate, separators K - M, O having a release layer on one surface (the front surface) of the separator were produced in the same manner as separator G.

[0197] (Separator J) To 100 parts by mass of polyvinyl alcohol (manufactured by Sekisui Chemical Co., Ltd., "BL-1"), 900 parts by mass of methanol was added and stirred well to prepare a coating liquid for forming a blocking layer. A separator substrate having a thickness of 85 μm and a basis weight of 64 g / m 2A sealant layer was formed on the surface of high-quality paper (manufactured by Nippon Paper Industries, "P-1") by applying the above-mentioned sealant layer forming solution to a dry thickness of 2 μm, and then drying it at 130°C for 1 minute. On the surface of the high-quality paper with the sealant layer formed on the surface, a release agent solution 5 was applied to a dry thickness of 0.5 μm, and then dried at 130°C for 1 minute to form a release layer. Next, a sealant layer was similarly formed on the back surface of the high-quality paper with the release layer formed on the surface, and then a release agent solution 4 was applied to a dry thickness of 0.5 μm, and then dried at 130°C for 1 minute to produce a separator J having a release layer with a thickness of 0.5 μm on both sides of the high-quality paper.

[0198] (Separator N) Separator N was prepared in the same manner as Separator J, except that the type of release agent solution was as shown in Table 2, and the release layer was formed only on the surface of the separator substrate. Separator N had a release layer on one side (surface) of the high-quality paper.

[0199] Regarding the front and back surfaces of the fabricated separator, the side with the "release layer (front)" as shown in Table 2 shall be considered the front surface of the separator, and the side with the "release layer (back)" shall be considered the back surface of the separator.

[0200] [Table 2]

[0201] (Preparation of tackifying resin (T2-1)) (Synthesis Example 1) Fifty parts by mass of toluene were added to a reactor equipped with a thermometer, stirrer, and condenser, and after purging with nitrogen, the reactor was heated and reflux was started. After 30 minutes, while maintaining the toluene at 75°C, two parts by mass of aluminum chloride (AlCl3) were added. A solution of 50 parts by mass of catechol (pyrocatechol) (n=2) and α-pinene (molar ratio: α-pinene / catechol = 80 / 20) dissolved in 50 parts by mass of toluene was gradually added dropwise over 1 hour and 30 minutes to allow the reaction to proceed. After polymerization for 4 hours, the hydrochloric acid generated from aluminum chloride (AlCl3) was neutralized by cooling while adding 0.1 parts by mass of pyridine to the reactor. The precipitate formed by neutralization was filtered, and after liquid-liquid extraction of the obtained filtrate, the toluene was evaporated to obtain a solid tackifying resin (T2-1). Regarding the obtained tackifying resin (T2-1) 1 ¹H-NMR measurements were performed to confirm that the tackifying resin (T2-1) is a copolymer having constituent units (A) derived from catechol (pyrocatechol) and constituent units (B) derived from α-pinene (a copolymer having constituent unit (A) in or at the ends of the main chain skeleton). The obtained tackifying resin (T2-1) was dissolved in tetrahydrofuran, and the resulting solution was filtered through a filter (material: polytetrafluoroethylene, pore diameter: 0.2 μm). The obtained filtrate was supplied to a gel permeation chromatograph (Waters, 2690 Separations Module), and GPC measurements were performed under conditions of sample flow rate of 1 mL / min and column temperature of 40°C. The polystyrene-equivalent molecular weight of the tackifying resin (T2-1) was measured, and the weight-average molecular weight (Mw) was determined to be 950. A GPC KF-802.5L column (Showa Denko) was used, and a differential refractometer was used as the detector.

[0202] (Synthesis Example 2) Except for changing the constituent monomer units to a total of 50 parts by mass of pyrogallol (n=3) and α-pinene (molar ratio: α-pinene / pyrogallol = 80 / 20), the tackifying resin (T2-1) was synthesized in the same manner as in "(Synthesis Example 1)" above, and measurements were performed. The weight-average molecular weight was 1100.

[0203] (Preparation of adhesive) (Adhesive A) To 100 parts by mass of solids of an acrylic adhesive containing a (meth)acrylic copolymer as a base polymer (manufactured by Soken Chemical Co., Ltd., "SK Dyne 1604N"), 20 parts by mass of a rosin ester resin (manufactured by Arakawa Chemical Industries, Ltd., "Pine Crystal KE-359") was added as a tackifying resin. Furthermore, 30 parts by mass of ethyl acetate (manufactured by Fuji Chemical Co., Ltd.) and 2.5 parts by mass of an isocyanate crosslinking agent (manufactured by Covestro, Inc., "Desmodule L-75") were added to prepare the adhesive composition, and by thoroughly stirring, adhesive A was obtained.

[0204] (Gel fraction of the adhesive layer) First, the obtained adhesive A was applied to the release surface of a 75 μm thick release PET film, and then dried at 100°C for 5 minutes to produce an adhesive tape for gel fraction measurement with a 50 μm thick adhesive layer. Next, the adhesive tape obtained for gel fraction measurement was cut to a size of 20 mm in width and 40 mm in length. The cut test pieces were immersed in ethyl acetate at 23°C for 24 hours, then removed from the organic solvent and dried at 110°C for 1 hour. The mass of the dried test pieces was measured, and the gel fraction was calculated using the following formula (4). Note that the test pieces were not laminated with a release PET film to protect the adhesive layer. Also, W0 in formula (4) was calculated as 0. The results are shown in Table 3. Gel fraction (mass %) = 100 × (W2 - W0) / (W1 - W0) (4) (W0: Mass of the substrate, W1: Mass of the test specimen before immersion, W2: Mass of the test specimen after immersion and drying)

[0205] (Preparation of adhesive) (Adhesives B~E) Except for using the compositions shown in Table 3, adhesives B to E were prepared in the same manner as adhesive A, and the gel fraction of the adhesive layer was measured. The results are shown in Table 3.

[0206] (Adhesive F) The composition was made as shown in Table 3, and an adhesive F was prepared in the same manner as adhesive A except that 30 parts by mass of toluene was used instead of 30 parts by mass of ethyl acetate. Also, the gel fraction of the adhesive layer was measured in the same manner as adhesive A except that the organic solvent for immersion was changed from ethyl acetate to toluene. The results are shown in Table 3.

[0207]

Table 3

[0208] (Example 1) (1) Manufacture of the wound body After applying the obtained adhesive A onto the surface of the separator G with a comma coater, drying was performed at 100 °C for 5 minutes and then at 130 °C for 10 minutes, thereby forming an adhesive layer (Y1) with a thickness of 200 μm on the surface of the separator G, and a laminated film was produced. A PET film with a thickness of 50 μm (manufactured by Toyobo Co., Ltd., "E5200") was prepared as a base material, and the produced laminated film was overlapped with the base material such that the adhesive layer (Y1) faced the base material, and a laminate having the base material, an adhesive layer (Y1) and a separator on one surface of the base material was obtained. Also, after applying the obtained adhesive A onto the surface of the release layer in the separator M with a comma coater, drying was performed at °C for 5 minutes and then at °C for 10 minutes, thereby forming an adhesive layer (Y2) with a thickness of 200 μm on the surface of the separator M. Next, it was overlapped so as to face the surface having the base material of the laminate on which the adhesive layer (Y2) was produced, and a laminate having a separator, an adhesive layer (Y1), a base material, an adhesive layer (Y2), and a separator in this order was obtained. Then, after peeling off the separator adjacent to the adhesive layer (Y2) to produce a laminated sheet (width: 900 mm, length: 30 m), it was wound around a core (material: ABS resin, outer diameter: 172 mm) and cured in an environment of 40 °C and 50% RH for 48 hours, thereby obtaining a wound body having a double-sided adhesive tape and a separator on one surface of the double-sided adhesive tape. The winding direction was set such that the separator of the laminated sheet was on the outer side of the winding. Furthermore, in the evaluation described later, the adhesive layer to be bonded to the SUS and the end plate was designated as adhesive layer (Y1), and the adhesive layer to be bonded to the PTFE plate was designated as adhesive layer (Y2).

[0209] (2) Measurement of 180° peeling force F1 The laminated sheet was removed from the resulting winding by holding both ends in the width direction of the laminated sheet and slowly pulling it by hand. The adhesive layer (Y2) of the obtained laminated sheet was backed with a 23 μm thick PET film (Futamura Chemical Co., Ltd., "FE2002"), and then cut to a size of 50 mm wide and 100 mm long to prepare test specimens. Next, the 180° peel force F1 of the prepared test specimens was measured using a tensile testing machine (Shimadzu Corporation, "Autograph") in accordance with JIS Z0237, by peeling the separator from the double-sided adhesive tape at 180° under conditions of 23°C and a peeling speed of 300 mm / min. The results are shown in Table 4.

[0210] (3) Measurement of 180° peeling force F2 Laminated sheets were removed from the obtained windings, and the adhesive layer (Y1) exposed by peeling the separator surface from the laminated sheet was backed with a 23 μm thick PET film (Futamura Chemical Co., Ltd., "FE2002"), and then the adhesive layer (Y2) was bonded to the back surface of the peeled separator, and then the specimens were cut to a size of 50 mm wide and 100 mm long to prepare test specimens. Next, the 180° peel force F2 of the prepared test specimens was measured by peeling the separator from the double-sided adhesive tape at 180° under conditions of 23°C and a peeling speed of 300 mm / min using a tensile testing machine (Shimadzu Corporation, "Autograph," etc.) in accordance with JIS Z0237. The results are shown in Table 4.

[0211] (4) Measurement of the 180° peel force of the adhesive layer (Y1) against SUS at 23°C A laminated sheet was removed from the obtained winding, and the adhesive layer (Y2) side of the laminated sheet was backed with a 23 μm thick PET film (Futamura Chemical Co., Ltd., "FE2002"), and then cut to a size of 25 mm wide x 100 mm long to prepare a test specimen. Next, the adhesive layer (Y1) side was placed on a 2 mm thick SUS304 plate that had been washed with ethanol and then wiped dry, and a laminate was fabricated by pressurizing it at 0.1 MPa for 1 hour in an environment of 120°C. The obtained laminates were subjected to a 180° peel test in accordance with JIS Z 0237, using a Shimadzu Corporation "Autograph" instrument, under conditions of 23°C, 50% RH, and a peeling speed of 300 mm / min. The 180° peel force of the heated adhesive layer (Y1) relative to SUS at 23°C was measured by peeling the adhesive tape from the SUS plate. The results are shown in Table 4.

[0212] (5) Measurement of the 180° peel force of the adhesive layer (Y2) against PTFE at 23°C A laminated sheet was removed from the obtained winding, and the adhesive layer (Y1) side of the laminated sheet was backed with a 23 μm thick PET film (Futamura Chemical Co., Ltd., "FE2002"), and then cut to a size of 25 mm wide x 100 mm long to prepare a test specimen. Next, the adhesive layer (Y2) side was placed on a 2 mm thick polytetrafluoroethylene board (Yodogawa Hutech Co., Ltd., "Yodoflon"), and after one back-and-forth motion using a 2 kg rubber roller at a speed of 300 mm / min, the laminate was left to cure for 20 minutes in an environment of 23°C and 50% RH to produce a laminate. The obtained laminates were subjected to a 180° peel test using a Shimadzu Autograph (manufactured by Shimadzu Corporation) in accordance with JIS Z 0237, under conditions of 23°C and a peeling speed of 300 mm / min. The 180° peel force of the adhesive layer (Y2) against PTFE at 23°C was measured by peeling the adhesive layer (Y2) from the polytetrafluoroethylene board. The results are shown in Table 4.

[0213] (Examples 2-21, Comparative Examples 1-2) In the above-described "(1) Manufacturing of the wound body," the laminated sheet and wound body were manufactured in the same manner as in Example 1, except that the type of separator, the composition of the adhesive composition (X1), the thickness of the adhesive layer (Y1), the type and thickness of the substrate, the composition of the adhesive composition (X2), and the thickness of the adhesive layer (Y2) were as shown in Tables 4 to 6, and measurements were taken. The results are shown in Tables 4 to 6.

[0214] (Example 22) (1) Manufacturing of wound bodies The obtained adhesive A was applied to the release layer of the prepared separator M using a comma coater, dried at 100°C for 5 minutes, and then dried at 130°C for 10 minutes to form an adhesive layer (Y1) with a thickness of 200 μm on the release layer of the separator M, thereby producing a laminated film. A PET film with a thickness of 50 μm (Toyobo Co., Ltd., "E5200") was prepared as the substrate, and the prepared laminated film was superimposed on the substrate so that the adhesive layer (Y1) faced the substrate, thereby obtaining a laminate having the substrate and the adhesive layer (Y1) on one side of the substrate. Furthermore, the obtained adhesive A was applied to the release layer of the prepared separator O using a comma coater, dried at 100°C for 5 minutes, and then dried at 130°C for 10 minutes to form an adhesive layer (Y2) with a thickness of 200 μm on the separator O, thereby producing a laminated film. A laminated sheet (900 mm wide, 30 m long) was prepared by overlapping a base material and a laminate in which an adhesive layer (Y1) is formed on one side of the base material, with the side of the base material without the adhesive layer (Y1) facing the adhesive layer (Y2) of a laminated film in which an adhesive layer (Y2) is formed on a separator O. This sheet was then wound onto a core (material: ABS resin, outer diameter: 172 mm) and cured for 48 hours at 40°C and 50% RH to obtain a wound body. The winding direction was such that the first separator of the laminated sheet was on the outside of the winding. Furthermore, in the evaluation described later, the adhesive layer to be bonded to the SUS and the end plate was designated as adhesive layer (Y1), and the adhesive layer to be bonded to the PTFE plate was designated as adhesive layer (Y2).

[0215] (2) Measurement of 180° peeling force F3 A laminated sheet was removed from the obtained winding, and the adhesive layer (Y2) was backed with a 23 μm thick PET film (Futamura Chemical Co., Ltd., "FE2002"), and then cut to a size of 50 mm wide and 100 mm long to prepare test specimens. Next, the 180° peel force F3 of the prepared test specimens was measured using a tensile testing machine (Shimadzu Corporation, "Autograph") in accordance with JIS Z0237, by peeling the first separator from the double-sided adhesive tape at 180° under conditions of 23°C and a peeling speed of 300 mm / min. The results are shown in Table 7.

[0216] (3) Measurement of 180° peeling force F4 A laminated sheet was removed from the obtained winding, and the adhesive layer (Y1) was backed with a 23 μm thick PET film (Futamura Chemical Co., Ltd., "FE2002"), and then cut to a size of 50 mm wide and 100 mm long to prepare test specimens. Next, the 180° peel force F4 of the prepared test specimens was measured using a tensile testing machine (Shimadzu Corporation, "Autograph") in accordance with JIS Z0237, by peeling the second separator from the double-sided adhesive tape at 180° under conditions of 23°C and a peeling speed of 300 mm / min. The results are shown in Table 7.

[0217] (4) Measurement of the 180° peel force of the adhesive layer (Y1) against SUS at 23°C A laminated sheet was removed from the obtained winding, and the adhesive layer (Y2) side was backed with a 23 μm thick PET film (Futamura Chemical Co., Ltd., "FE2002"), and then cut to a size of 25 mm wide x 100 mm long to prepare a test specimen. Next, the adhesive layer (Y1) side was placed on a 2 mm thick SUS304 plate that had been washed with ethanol and then wiped dry, and a laminate was fabricated by pressurizing it at 0.1 MPa for 1 hour in an environment of 120°C. The obtained laminates were subjected to a 180° peel test in accordance with JIS Z 0237, using a Shimadzu Corporation "Autograph" instrument, under conditions of 23°C, 50% RH, and a peeling speed of 300 mm / min. The 180° peel force of the heated adhesive layer (Y1) relative to SUS at 23°C was measured by peeling the adhesive tape from the SUS plate. The results are shown in Table 7.

[0218] (5) Measurement of the 180° peel force of the adhesive layer (Y2) against PTFE at 23°C A laminated sheet was removed from the obtained winding, and the adhesive layer (Y1) side was backed with a 23 μm thick PET film (Futamura Chemical Co., Ltd., "FE2002"), and then cut to a size of 25 mm wide x 100 mm long to prepare a test specimen. Next, the adhesive layer (Y2) side was placed on a 2 mm thick polytetrafluoroethylene board (Yodogawa Hutech Co., Ltd., "Yodoflon"), and after one back-and-forth motion using a 2 kg rubber roller at a speed of 300 mm / min, the laminate was left to cure for 20 minutes in an environment of 23°C and 50% RH to produce a laminate. The obtained laminates were subjected to a 180° peel test using a tensile testing machine (Shimadzu Corporation, "Autograph") in accordance with JIS Z 0237, under conditions of 23°C and a peeling speed of 300 mm / min. The 180° peel force of the adhesive layer (Y2) against PTFE at 23°C was measured by peeling the adhesive layer (Y2) from the polytetrafluoroethylene board. The results are shown in Table 7.

[0219] (Examples 23-43, Comparative Examples 3-4) In the above-described "(1) Manufacturing of the wound body," the laminated sheet and wound body were manufactured in the same manner as in Example 1, except that the type of separator, the composition of the adhesive composition (X1), the thickness of the adhesive layer (Y1), the type and thickness of the substrate, the composition of the adhesive composition (X2), and the thickness of the adhesive layer (Y2) were as shown in Tables 7 to 9, and measurements were taken. The results are shown in Tables 7 to 9. In Example 43, the winding direction during the manufacturing of the wound body was changed so that the second separator of the laminated sheet was on the outside of the winding.

[0220] <Rating> The obtained coiled bodies were evaluated using the following method. The results are shown in Tables 4-9.

[0221] (Adhesion reliability) The laminated sheet was removed from the obtained winding and cut to a size of 210 mm in width and 297 mm in length. Then, if necessary, the separator protecting the adhesive layer (Y2) was peeled off, and the adhesive layer (Y2) side was placed on a polytetrafluoroethylene board (Yodogawa Hutech Co., Ltd., "Yodoflon") measuring 210 mm in width, 297 mm in length, and 2 mm in thickness. A laminate was then fabricated by rolling it back and forth once at a speed of 300 mm / min using a 2 kg rubber roller. The separator protecting the adhesive layer (Y1) of the above laminate was peeled off, and after heating at 100°C for 3 minutes, the adhesive layer (Y1) was immediately bonded along the circumferential direction of the side surface inside the end plate (Ohama Press Co., Ltd., "10% flat end plate"). After bonding, the adhesion between the double-sided adhesive tape and the polytetrafluoroethylene board and end plate, as well as the lifting of the above laminate from the end plate, were visually observed. Evaluation was performed according to the following criteria. ○: No floating occurred in any of the layers. △: Some lifting occurred between the adhesive layer (Y2) and the polytetrafluoroethylene plate, or between the adhesive layer (Y1) and the end plate. ×: Delamination occurred between the adhesive layer (Y2) and the polytetrafluoroethylene plate, or between the adhesive layer (Y1) and the end plate.

[0222] (Tunneling of a wound body) In the above-mentioned "(1) Manufacturing of the wound material," the manufactured wound material was visually inspected, and its tunneling was evaluated according to the following criteria. • ○: There was no tunneling. • △: There were 1 to 5 tunneling locations. • ×: There were more than 6 tunneling locations.

[0223] (Separator peeling off) (Examples 1-21, Comparative Examples 1-2) The laminated sheet was removed from the resulting winding by holding both ends in the width direction and slowly pulling it by hand. Test specimens were then prepared by cutting the sheet to a size of 50 mm in width and 100 mm in length. For the prepared test specimens, the adhesive layer (Y2) was placed on a 2 mm thick polytetrafluoroethylene board (Yodogawa Hutech Co., Ltd., "Yodoflon"), and a 2 kg rubber roller was used to roll it back and forth once at a speed of 300 mm / min. After that, the sheet was left to cure for 20 minutes in an environment of 23°C and 50% RH to create a laminate. The presence or absence of peeling of the separator protecting the adhesive layer (Y1) when removing the laminated sheet from the winding was observed by holding both ends of the laminated sheet and slowly pulling it by hand. Evaluation was performed according to the following criteria. ○: No peeling occurred of the separator protecting the adhesive layer (Y1). △: Peeling of the separator protecting the adhesive layer (Y1) occurred only at the edges. ×: The separator protecting the adhesive layer (Y1) peeled off beyond the edges. Even if the evaluation is "×", the wound body of the present invention can still be used without problems depending on the application.

[0224] (Examples 22-43, Comparative Examples 3-4) The laminated sheet was removed from the obtained winding and cut to a size of 50 mm wide x 100 mm long. Using tweezers, the separator on the adhesive layer (Y2) side was peeled off and placed on a 2 mm thick polytetrafluoroethylene board (Yodogawa Hutech Co., Ltd., "Yodoflon"), and after one pass back and forth at a speed of 300 mm / min using a 2 kg rubber roller, the laminate was left to cure for 20 minutes in an environment of 23°C and 50% RH. The presence or absence of peeling of the separator protecting the adhesive layer (Y1) when the separator on the adhesive layer (Y2) side was peeled off using the tweezers was observed. Evaluation was performed according to the following criteria. ○: No peeling occurred of the separator protecting the adhesive layer (Y1). △: Peeling of the separator protecting the adhesive layer (Y1) occurred only at the edges. ×: The separator protecting the adhesive layer (Y1) peeled off beyond the edges. Even if the evaluation is "×", the wound body of the present invention can still be used without problems depending on the application.

[0225] [Table 4]

[0226] [Table 5]

[0227] [Table 6]

[0228] [Table 7]

[0229] [Table 8]

[0230] [Table 9] [Industrial applicability]

[0231] According to the present invention, it is possible to provide a wound material that exhibits excellent adhesive reliability when bonding fluororesin to a can or the like, has minimal floating (tunneling), and is easy to handle. Furthermore, according to the present invention, it is possible to provide a method for manufacturing a chemical tank using the wound material. Moreover, according to the present invention, it is possible to provide a chemical tank with double-sided adhesive tape attached to the wound material.

Claims

1. A winding body having a structure in which laminated sheets are wound around a core, The outer diameter of the aforementioned core is 160 mm or more and 550 mm or less. The laminated sheet comprises a double-sided adhesive tape having an adhesive layer, and a separator on one side of the double-sided adhesive tape. The adhesive layer includes an adhesive layer (Y1) formed using an adhesive composition (X1), The total thickness of the adhesive layer of the double-sided adhesive tape is 300 μm or more and 1500 μm or less. In the aforementioned winding, the laminated sheet is wound such that the separator is on the outside of the winding. A coiled body characterized by the following features.

2. Let the side of the double-sided adhesive tape having the separator be called surface (a), and let F be the 180° peel force at 23°C at the interface between surface (a) and the separator. １ In that case, Said F １ The winding body according to claim 1, wherein the current is 150 mN / 50 mm or more and 2000 mN / 50 mm or less.

3. Let the side of the double-sided adhesive tape that does not have a separator be called surface (b), and when surface (b) is attached to the side of the separator that is not in contact with surface (a) of the double-sided adhesive tape, the 180° peel force at 23°C at the interface between surface (b) and the separator is F. ２ In that case, Said F ２ The winding body according to claim 2, wherein the strength is 1000 mN / 50 mm or less.

4. A winding body having a structure in which laminated sheets are wound around a core, The outer diameter of the aforementioned core is 160 mm or more and 550 mm or less. The laminated sheet comprises a double-sided adhesive tape having an adhesive layer, and separators on both sides of the double-sided adhesive tape. The adhesive layer includes an adhesive layer (Y1) formed using an adhesive composition (X1), The total thickness of the adhesive layer of the double-sided adhesive tape is 300 μm or more and 1500 μm or less. A coiled body characterized by the following features.

5. The separators on both sides of the laminated sheet have different magnitudes of 180° peel force at 23°C from the double-sided adhesive tape. The separator with the greater 180° peeling force is designated as the first separator, and the separator with the smaller 180° peeling force is designated as the second separator. The winding body according to claim 4.

6. The 180° peel force F between the first separator and the double-sided adhesive tape at a 23° angle. ３ The winding body according to claim 5, wherein the current is 150 mN / 50 mm or more and 2000 mN / 50 mm or less.

7. The 180° peel force F between the second separator and the double-sided adhesive tape at 23°. ４ The wound body according to claim 5, wherein the strength is 1000 mN / 50 mm or less.

8. The winding body according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the separator is composed of at least one selected from the group consisting of polyester resin, polyolefin resin, and paper.

9. The wound body according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the separator has a release layer containing at least one release agent selected from the group consisting of polyolefin-based release agents, silicone-based release agents, and fluororesin-based release agents.

10. The adhesive composition (X1) contains a base polymer (P1), The base polymer (P1) comprises at least one selected from the group consisting of (meth)acrylic copolymers and styrene-based elastomers. The winding body according to claim 1, 2, 3, 4, 5, 6, or 7.

11. The winding body according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the adhesive composition (X1) further contains a tackifying resin (T1).

12. The winding body according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the adhesive layer (Y1) has a 180° peel force of 50 N / 25 mm or more against SUS at 23°C.

13. The winding body according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the adhesive layer comprises an adhesive layer (Y2) formed using an adhesive composition (X2).

14. The adhesive composition (X2) contains a base polymer (P2), The base polymer (P2) comprises at least one selected from the group consisting of (meth)acrylic copolymers and styrene-based elastomers. The winding body according to claim 13.

15. The winding body according to claim 13, wherein the adhesive composition (X2) further contains a tackifying resin (T2).

16. The winding body according to claim 15, wherein the tackifying resin (T2) comprises a tackifying resin (T2-1) having at least one constituent unit (A) selected from the group consisting of constituent units (A-1), (A-1'), (A-2), (A-2'), (A-3), (A-3'), (A-4), and (A-4') represented by the following formula. 【Chemistry 1】 【Chemistry 2】 【Transformation 3】 【Chemistry 4】 In the formula, R １ ~R ７ * represents a hydrogen atom, an aliphatic hydrocarbon group, an aromatic hydrocarbon group, a polar functional group, an aliphatic hydrocarbon group having a polar functional group, or an aromatic hydrocarbon group having a polar functional group, respectively. n and l each represent an integer between 2 and 4, and n' and l' each represent an integer between 2 and 5. m and k each represent an integer between 1 and 4, and m' and k' each represent an integer between 1 and 5. * represents a linking part.

17. The winding body according to claim 13, wherein the adhesive layer (Y2) has a 180° peel strength of 5.0 N / 25 mm or more against polytetrafluoroethylene (PTFE) at 23°C.

18. The laminated sheet has a base material, The substrate contains at least one selected from the group consisting of polyester resin, polyimide resin, polyether resin, polyolefin resin, polyurethane resin, metal, glass fiber, and carbon fiber. The winding body according to claim 1, 2, 3, 4, 5, 6, or 7.

19. A wound body according to claim 1, 2, 3, 4, 5, 6, or 7, used for lining a tank body in a chemical tank.

20. A lining sheet manufacturing step comprising pressing a sheet containing fluororesin onto the adhesive layer (Y2) of the double-sided adhesive tape in the wound body according to claim 13, A separator peeling step is performed to peel off the separator on the adhesive layer (Y1) side from the lining sheet produced in the lining sheet production step, thereby exposing the adhesive layer (Y1). This includes a lining sheet bonding step, which involves bonding the adhesive layer (Y1) to the inside of the can body of the chemical tank. A method for manufacturing a chemical tank.

21. A chemical tank having a double-sided adhesive tape attached to the inner surface of a can body in the winding body according to claim 1, 2, 3, 4, 5, 6, or 7.

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