Adhesive compositions, sheet-type gaskets, flooring materials, cushioning materials, and sealing materials

Abstract

To provide an adhesive composition that can form an adhesive layer with excellent tackiness at both high temperatures (100°C or higher, e.g., 120°C) and room temperatures of around 25°C. [Solution] An adhesive composition characterized by containing (a) a (co)polymer (A) having a polymer block of methylstyrene monomer, (c) one or more olefin polymers (B) comprising a (co)polymer block or a portion thereof or a fully hydrogenated block of one or more aliphatic monoolefins and / or aliphatic polyenes, wherein the content of the block of (c) exceeds 87% by mass and is 100% by mass or less, and one or more tackifiers (C).

Description

Technical Field

[0001] The present invention relates to an adhesive composition used for forming an adhesive layer, and a sheet gasket, a flooring material, a sealing material inside an automobile door, a cushioning material for a fuel tank, a sealing material for electronic components, a cushioning material for a lithium-ion battery, a sealing material between a solar cell panel and a support member of a solar cell module for a solar cell, a sealing material for electronic devices, a sealing material for electrolytic devices, and a sealing material.

Background Art

[0002] A fuel cell (FEFC) consists of an ion exchange membrane (electrolyte), an oxygen electrode, a hydrogen electrode, a support current collector, and a carbon separator having a rectifying groove for flowing gas on one side and a rectifying groove for flowing cooling water on the other side. A single cell is formed by sandwiching an ion exchange membrane and both electrodes integrated by this separator.

[0003] Then, a large number of single cells are arranged and stacked to form a stack. Metal current collector plates are interposed at both ends of the stack to form external current extraction terminals. Further, a tightening plate is arranged via an insulating plate, and the whole is tightened and integrated with bolts to constitute a fuel cell.

[0004] In such a separator for a fuel cell, a gasket is used to prevent leakage of cooling water. For example, Patent Document 1 discloses a separator used for a fuel cell in which electrodes are arranged on both sides of an ion exchange membrane, and these are sandwiched by a separator to form a single cell, and a gasket or a rubber ring is integrally bonded to the separator.

[0005] Furthermore, in automotive electronic components, it is necessary to isolate the internal electronic components from the outside air, so a sealing material with excellent airtightness is required at the contact points between external connection components and the housing, and at the overlapping points of housings. Similarly, in electronic devices used outside of automobiles, it is necessary to isolate the internal electronic components from the outside air, so a sealing material with excellent airtightness is required at the contact points between external connection components and the housing, and at the overlapping points of housings.

[0006] Furthermore, in solar cell modules, a sealing material with excellent airtightness is required between the solar cell panel and its support member to block out external moisture.

[0007] Furthermore, in stacked lithium-ion batteries, cushioning material is provided between the stacked cells to fix each cell in place while following the expansion or contraction of the cells.

[0008] In addition, electrolytic devices use sealing materials for electrolytic cells. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2000-156234 [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] In the conventional technology described above, sealing performance is improved by increasing the elastic modulus of the solid rubber material, which is the main material of the sealing material, or by increasing the compressive stress of the foamed rubber material.

[0011] However, if the crosslinking density of the solid rubber is increased too much to increase the elastic modulus of the solid rubber material, or if the foaming rate is decreased too much to increase the compressive stress of the foamed rubber material, high surface pressure is generated at the sealing area, which can damage other components with lower strength. On the other hand, if the elastic modulus of the solid rubber is decreased or the foaming rate is increased too much to prevent high surface pressure from being generated at the sealing area, the deterioration of the sealing material over time becomes excessive.

[0012] Therefore, it is necessary to improve the sealing performance of the sealant by means other than increasing the elastic modulus of the solid rubber material that is the main material of the sealant, or increasing the recovery rate of the foamed rubber material. One such method is to apply an adhesive layer using an adhesive composition to the surface of the elastic rubber material, such as the solid rubber material or foamed rubber material that is the main material of the sealant, thereby increasing the adhesion between the elastic rubber material and the object to be sealed.

[0013] Furthermore, some sealing materials use resin, metal, paper, or cork. In these cases, as with elastic rubber materials, an adhesive layer is applied to the surface of the resin, metal, paper, or cork material to improve the sealing performance of the sealing material. This increases the adhesion of the resin material to the object to be sealed, thereby improving the adhesion between the resin, metal, paper, or cork material and the object to be sealed.

[0014] Furthermore, in some cases, an adhesive layer consisting solely of an adhesive composition may be used as a sealing material, without using a base material such as elastic rubber, resin, metal, paper, or cork.

[0015] Here, automotive electronic components, solar modules, and automotive lithium-ion secondary batteries may experience localized or temporary high temperatures (100°C or higher, e.g., 120°C) during the summer. It is desirable that the adhesive composition maintains its sealing properties even under harsh sealing conditions and high-temperature environments of around 120°C. Furthermore, electrolytic devices may also experience high temperatures.

[0016] Furthermore, even in sealing materials formed solely of an adhesive layer made of an adhesive composition, there is a need for a sealing material that exhibits excellent sealing performance not only at room temperature of around 25°C but also at high temperatures (100°C or higher, for example, 120°C).

[0017] Therefore, a sealing material is needed that exhibits excellent sealing performance not only at room temperature of around 25°C but also at high temperatures (100°C or higher, for example, 120°C). Thus, sealing materials in which an adhesive layer is provided on elastic rubber material or resin material, metal material, paper material, and cork material require an adhesive layer that exhibits excellent adhesion not only at room temperature of around 25°C but also at high temperatures (100°C or higher, for example, 120°C).

[0018] Therefore, the object of the present invention is either (1) or (2) below. (1) To provide an adhesive composition for forming an adhesive layer on the surface of an elastic rubber material, resin material, metal material, paper material, or cork material which is the main material of a sealing material, which can form an adhesive layer with excellent adhesive properties at both high temperatures (100°C or higher, for example 120°C) and room temperatures of about 25°C. (2) The objective is to provide an adhesive composition for forming an adhesive layer in a sealing material which is formed solely of an adhesive layer made of an adhesive composition, and which can form an adhesive layer with excellent adhesive properties at both high temperatures (100°C or higher, for example 120°C) and room temperatures of about 25°C. [Means for solving the problem]

[0019] The above problems are solved as follows: In other words, the present invention (1) is, (a) A (co)polymer (A) containing a polymer block of methylstyrene monomers, (c) One or more (co)polymer blocks of aliphatic monoolefins and / or one or more aliphatic polyenes, or partial or fully hydrogenated blocks thereof, wherein the content ratio of the blocks of (c) exceeds 87% by mass and is 100% by mass or less based on the monomers, and one or more olefin polymers (B), One or more tackifiers (C), and provides an adhesive composition characterized by containing the same.

[0020] Further, the present invention (2) provides the adhesive composition of (1), characterized in that the (co)polymer (A) is a copolymer containing (b) one or more (co)polymer blocks of aliphatic monoolefins and / or one or more aliphatic conjugated diolefins, or partial or fully hydrogenated blocks thereof.

[0021] Further, the present invention (3) provides the adhesive composition of (1) or (2), characterized in that the ratio of the content of the (co)polymer (A) to the total content of the (co)polymer (A) and the olefin polymer (B) (((co)polymer (A) / ((co)polymer (A) + olefin polymer (B))) × 100) is 5 to 95% by mass.

[0022] Further, the present invention (4) provides the adhesive composition according to any one of (1) to (3), characterized in that the olefin polymer (B) is a (co)polymer of one or more α-olefins selected from ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene, or a copolymer of one or more α-olefins selected from ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene and one or more aliphatic polyene compounds selected from ethylidene norbornene, dicyclopentadiene, hexadiene, vinyl norbornene, butadiene, and isoprene.

[0023] Further, the present invention (5) provides the adhesive composition according to any one of (1) to (4), characterized in that the olefin polymer (B) is a diene rubber selected from butyl rubber, natural rubber, isoprene rubber, butadiene rubber, and styrene-butadiene rubber, or a partially or fully hydrogenated diene rubber thereof.

[0024] Further, the present invention (6) provides the adhesive composition according to any one of (1) to (5), characterized in that the tackifier (C) is at least one selected from terpene phenol resin, hydrogenated terpene phenol resin, phenol resin, xylene resin, and rosin resin.

[0025] Further, the present invention (7) provides the adhesive composition according to any one of (1) to (6), characterized by containing at least one copolymer (F) selected from polyphenylene ether copolymers, styrene-maleic anhydride copolymers, styrene-N-phenylmaleimide copolymers, and styrene-N-phenylmaleimide copolymer-maleic anhydride copolymers, and having a glass transition temperature of 140 °C or higher.

[0026] Further, the present invention (8) provides the adhesive composition according to any one of (1) to (7), characterized in that the content of the α-methylstyrene unit in the (co)polymer (A) is 10 to 40% by mass based on the monomer.

[0027] Further, the present invention (9) provides the adhesive composition according to any one of (1) to (8), characterized in that the (b) is a copolymer block of one or more monomers selected from ethylene, propylene, 1-butene, isobutylene, butadiene, isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidenedodeca-1,6,10-triene, or a partially or fully hydrogenated block thereof.

[0028] Furthermore, the present invention (10) provides any of the adhesive compositions (1) to (9) characterized in that the (co)polymer (A) is a triblock copolymer comprising (a) a polymer block of α-methylstyrene monomer - (b) a copolymer block or a portion thereof or a fully hydrogenated block of one or more monomers selected from ethylene, propylene, 1-butene, isobutylene, butadiene, isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene - (a) a polymer block of α-methylstyrene monomer.

[0029] Furthermore, the present invention (11) provides a sheet-like gasket characterized in that the ratio of the peel strength value at 25°C, the peel strength value at 100°C, and the peel strength value at 120°C to the peel strength value at 25°C of an adhesive composition (R) comprising (a) a (co)polymer (A) containing a polymer block of methylstyrene monomer, (c) an olefin polymer (B) containing a (co)polymer block or a portion thereof or a fully hydrogenated block of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, and a tackifier (C), wherein the α-methylstyrene unit content is 29% by mass on a monomer basis, is 29% by mass of hydrogenated α-methylstyrene-butadiene block copolymer, and 50 parts by mass of terpene phenol resin as an adhesive, is 2.50 or more.

[0030] Furthermore, the present invention (12) provides a sheet-like gasket characterized by having an adhesive layer made of any of the adhesive compositions (1) to (11).

[0031] Furthermore, the present invention (13) provides a flooring material characterized by having an adhesive layer made of any of the adhesive compositions of (1) to (11).

[0032] The present invention (14) provides a sealing material for the inside of an automobile door, characterized by having an adhesive layer made of any of the adhesive compositions (1) to (11).

[0033] The present invention (15) provides a cushioning material for a fuel tank, characterized by having an adhesive layer made of any of the adhesive compositions (1) to (11).

[0034] The present invention (16) provides a sealing material for electronic components, characterized by having an adhesive layer made of any of the adhesive compositions (1) to (11).

[0035] The present invention (17) provides a cushioning material for lithium-ion batteries, characterized by having an adhesive layer made of any of the adhesive compositions (1) to (11).

[0036] The present invention (18) provides a sealing material for a solar cell module between a solar cell panel and a support member, characterized by having an adhesive layer made of any of the adhesive compositions (1) to (11).

[0037] The present invention (19) provides a sealing material for electronic equipment characterized by having an adhesive layer made of any of the adhesive compositions (1) to (11).

[0038] The present invention (20) provides a sealing material for an electrolytic device, characterized by having an adhesive layer made of any of the adhesive compositions (1) to (11).

[0039] The present invention (21) provides a sealing material for an electrolytic device, characterized in that it is formed only of an adhesive layer consisting of any of the adhesive compositions (1) to (11). [Effects of the Invention]

[0040] According to the present invention, an adhesive composition for forming an adhesive layer on the surface of an elastic rubber material which is the main material of a sealing material can be provided, and which can form an adhesive layer with excellent adhesive properties at both high temperatures (100°C or higher, for example, 120°C) and room temperatures of about 25°C. Furthermore, according to the present invention, there is an adhesive composition for forming an adhesive layer in a sealing material which is formed solely of an adhesive layer made of an adhesive composition, and which can form an adhesive layer with excellent adhesive properties at both high temperatures (100°C or higher, for example, 120°C) and room temperatures of about 25°C. [Modes for carrying out the invention]

[0041] The adhesive composition of the first embodiment of the present invention is (a) A (co)polymer (A) containing a polymer block of methylstyrene monomers, (c) an olefin polymer (B) comprising a (co)polymer block or a portion thereof or a fully hydrogenated block of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, wherein the content of the block in (c) exceeds 87% by mass and is 100% by mass or less, based on monomers, Tackifier (C), This adhesive composition is characterized by containing [a specific compound]. In this specification, "(co)polymerization" means "polymerization or copolymerization."

[0042] Furthermore, the adhesive composition of the first embodiment of the present invention is: (a) A polymer (A) comprising a polymer block of methylstyrene monomer and (b) a (co)polymer block or a partial or fully hydrogenated block thereof of one or more aliphatic monoolefins and / or one or more aliphatic conjugated diolefins, (c) One or more olefin polymers (B) comprising a (co)polymer block or a portion thereof or a fully hydrogenated block of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, wherein the content of the block in (c) exceeds 87% by mass and is 100% by mass or less, based on monomers, Tackifier (C), Examples of adhesive compositions include those characterized by containing [a specific substance].

[0043] The adhesive composition of the first embodiment of the present invention contains at least a (co)polymer (A), an olefin polymer (B), and a tackifier (C).

[0044] The adhesive composition of the second embodiment of the present invention is (a) A (co)polymer (A) containing a polymer block of methylstyrene monomers, (c) an olefin polymer (B) comprising a (co)polymer block or a portion thereof or a fully hydrogenated block of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, Tackifier (C), It contains, The adhesive composition (R) comprises 100 parts by mass of a hydrogenated α-methylstyrene-butadiene block copolymer having an α-methylstyrene unit content of 29% by mass on a monomer basis, and 50 parts by mass of a terpene phenol resin as an adhesive, and the ratio of the peel strength value at 25°C, the ratio of the peel strength value at 100°C, and the ratio of the peel strength value at 120°C to the peel strength value at 25°C are all 2.5 or higher. This is an adhesive composition characterized by the following:

[0045] Furthermore, the adhesive composition of the second embodiment of the present invention is: (a) A polymer (A) comprising a polymer block of a methylstyrene monomer polymer block, and (b) a (co)polymer block or a portion or fully hydrogenated block thereof of one or more aliphatic monoolefins and / or one or more aliphatic conjugated diolefins, (c) One or more olefin polymers (B) comprising a (co)polymer block or a portion thereof or a fully hydrogenated block of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, Tackifier (C), It contains, The adhesive composition (R) comprises 100 parts by mass of a hydrogenated α-methylstyrene-butadiene block copolymer having an α-methylstyrene unit content of 29% by mass on a monomer basis, and 50 parts by mass of a terpene phenol resin as an adhesive, and the ratio of the peel strength value at 25°C, the ratio of the peel strength value at 100°C, and the ratio of the peel strength value at 120°C to the peel strength value at 25°C are all 2.5 or higher. Examples of adhesive compositions characterized by the above include:

[0046] The adhesive composition of the second embodiment of the present invention contains at least a (co)polymer (A), an olefin polymer (B), and a tackifier (C).

[0047] The common features of the first embodiment of the adhesive composition of the present invention and the second embodiment of the adhesive composition of the present invention are described by referring to both the first embodiment of the adhesive composition of the present invention and the second embodiment of the adhesive composition of the present invention collectively as the adhesive composition of the present invention.

[0048] The (co)polymer (A) in the adhesive composition of the present invention is a (co)polymer having a polymer block of (a) methylstyrene monomer. That is, in (co)polymer (A), one or more (a) block portions are present in the molecular chain of the (co)polymer. The (co)polymer (A) may consist of a polymer of one type of methylstyrene monomer; a copolymer of two or more types of methylstyrene monomers; or a (co)polymer block of one or more types of methylstyrene and a (co)polymer block of one or more types of monomers other than methylstyrene.

[0049] Furthermore, the (co)polymer (A) includes copolymers having (a) a polymer block of methylstyrene monomer and (b) a (co)polymer block or a portion thereof or a fully hydrogenated block of one or more aliphatic olefins and / or one or more aliphatic conjugated diolefins. In other words, the (co)polymer (A) includes copolymers in which the molecular chain of the copolymer has one or more block portions of (a) and one or more block portions of (b).

[0050] Block (a) is a polymer block of methylstyrene monomers, and is a block formed by the polymerization of methylstyrene. In other words, the polymer block of methylstyrene monomer (a) is the part formed by polymerization using methylstyrene as the monomer.

[0051] Examples of methylstyrene monomers related to the block in (a) include α-methylstyrene, β-methylstyrene, 2-methylstyrene, 3-methylstyrene, and 4-methylstyrene, with α-methylstyrene being preferred as the monomer because it exhibits high tackiness at high temperatures. The block in (a) is a (co)polymer block of one or more methylstyrene monomers selected from α-methylstyrene monomer, β-methylstyrene monomer, 2-methylstyrene monomer, 3-methylstyrene monomer, 4-methylstyrene monomer, etc.

[0052] The block in (b) is (b1) a (co)polymer block of one or more aliphatic monoolefins and / or one or more aliphatic conjugated diolefins, or (b2) a polymer block formed by polymerization of one or more aliphatic monoolefins and / or one or more aliphatic conjugated diolefins, wherein some or all of the double bonds are hydrogenated after polymerization.

[0053] In other words, (b1) is a portion formed by polymerization using one type of aliphatic monoolefin as a monomer, a portion formed by copolymerization using two or more types of aliphatic monoolefins as monomers, a portion formed by polymerization using one type of aliphatic conjugated diolefin as a monomer, a portion formed by copolymerization using two or more types of aliphatic conjugated diolefins as monomers, or a portion formed by copolymerization using one or more types of aliphatic monoolefins and one or more types of aliphatic conjugated diolefins as monomers.

[0054] Furthermore, (b2) is a portion formed by polymerization using one type of aliphatic conjugated diolefin as a monomer, a portion formed by copolymerization using two or more types of aliphatic conjugated diolefins as monomers, or a portion formed by copolymerization using one or more types of aliphatic monoolefins and one or more types of aliphatic conjugated diolefins as monomers, and furthermore, a portion formed by hydrogenation of some or all of the double bonds after polymerization.

[0055] The aliphatic monoolefins related to block (b) are linear or branched aliphatic monoolefins having 2 or more carbon atoms, preferably 2 to 13. Examples of aliphatic monoolefins related to block (b) include ethylene, propylene, 1-butene, 2-butene, isobutylene, 1-pentene, 2-pentene, 2-methyl-1-butene, 2-methyl-2-butene, 3-methyl-1-butene, 1-hexene, 2-hexene, 3-hexene, 2-methyl-1-pentene, 2-methyl-2-pentene, 4-methyl-1-pentene, 4-methyl-2-pentene, n-heptene, isoheptene, n-octene, isooctene, n-nonene, isooctene, n-decene, isodecene, n-undecene, isoundecene, 6,10-dimethyl-1-undecene, etc.

[0056] The aliphatic conjugated diolefins related to the block in (b) are linear or branched aliphatic conjugated diolefins having 4 or more carbon atoms, preferably 4 to 15. Examples of aliphatic conjugated diolefins related to the block in (b) include 1,3-butadiene, 2-methyl-1,3-butadiene (isoprene), 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 3-methyl-1,3-pentadiene, 1,3-hexadiene, 1,3-cyclohexadiene, 1,3-heptadiene, 1,3-octadiene, 2-methyl-1,3-octadiene, myrcene, (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene (common name: β-farnesene), etc.

[0057] As for the block in (b), a copolymer block of two or more monomers selected from ethylene, propylene, 1-butene, butadiene, isoprene, 6,10-dimethyl-1-undecene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or a partially or completely hydrogenated thereof block is preferred in that it has high adhesive strength at room temperature of about 25°C.

[0058] Such a block (b) is preferably, (i) Ethylene and 1-butene copolymer block, A copolymer block of ethylene and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, Copolymer blocks of 1-butene and (conjugated) butadiene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, (Conjugated) butadiene polymer blocks or parts thereof or complete hydrogenated blocks, (ii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, (conjugated) isoprene polymer blocks, parts thereof, or complete hydrogenated blocks (iii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, (conjugated)butadiene, and (conjugated)isoprene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of (conjugated) butadiene and (conjugated) isoprene, or partial or complete hydrogenated product blocks thereof, (iv) Isobutylene polymer block (v) Copolymer block of ethylene and 6,10-dimethyl-1-undecene, Copolymer blocks of ethylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof or complete hydrogenated blocks, (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene polymer blocks, parts thereof, or complete hydrogenated blocks (vi) Copolymer block of ethylene, 1-butene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) butadiene and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, Copolymer blocks of ethylene, 1-butene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof or complete hydrogenated blocks, Copolymer blocks of ethylene, (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, (vii) Copolymer block of ethylene, propylene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of propylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, A copolymer block of ethylene, propylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) isoprene and 6,10-dimethyl-1-undecene, or parts thereof, or fully hydrogenated blocks, Copolymer blocks of ethylene, propylene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of propylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) isoprene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of propylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof, or complete hydrogenated blocks, (viii) (Conjugated) butadiene polymer block, (ix) It is a polymer block of (conjugated) isoprene.

[0059] (b) Block is more preferably: (i) Ethylene and 1-butene copolymer block, A copolymer block of ethylene and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, Copolymer blocks of 1-butene and (conjugated) butadiene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, (Conjugated) butadiene polymer blocks or parts thereof or complete hydrogenated blocks, (ii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, (conjugated) isoprene polymer blocks, parts thereof, or complete hydrogenated blocks (iii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, (conjugated)butadiene, and (conjugated)isoprene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of (conjugated) butadiene and (conjugated) isoprene, or partial or complete hydrogenated product blocks thereof, (iv) Isobutylene polymer block (v) Copolymer block of ethylene and 6,10-dimethyl-1-undecene, Copolymer blocks of ethylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof or complete hydrogenated blocks, (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene polymer blocks, parts thereof, or complete hydrogenated blocks (vi) Copolymer block of ethylene, 1-butene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) butadiene and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, Copolymer blocks of ethylene, 1-butene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, (vii) Copolymer block of ethylene, propylene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of propylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, A copolymer block of ethylene, propylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) isoprene and 6,10-dimethyl-1-undecene, or parts thereof, or fully hydrogenated blocks, Copolymer blocks of ethylene, propylene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of propylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) isoprene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of propylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof, or complete hydrogenated blocks, That is the case.

[0060] (b) Block is more preferably: (i) Ethylene and 1-butene copolymer block, A copolymer block of ethylene and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, Copolymer blocks of 1-butene and (conjugated) butadiene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, (Conjugated) butadiene polymer blocks or parts thereof or complete hydrogenated blocks, (ii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, (conjugated) isoprene polymer blocks, parts thereof, or complete hydrogenated blocks (iii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, (conjugated)butadiene, and (conjugated)isoprene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of (conjugated) butadiene and (conjugated) isoprene, or partial or complete hydrogenated product blocks thereof, (iv) Isobutylene polymer block (v) Copolymer block of ethylene and 6,10-dimethyl-1-undecene, Copolymer blocks of ethylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof or complete hydrogenated blocks, (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene polymer blocks, parts thereof, or complete hydrogenated blocks (vi) Copolymer block of ethylene, 1-butene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) butadiene and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, Copolymer blocks of ethylene, 1-butene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, A copolymer block of (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or a partial or complete hydrogenated copolymer block thereof.

[0061] (b) Block is particularly preferably, (i) Ethylene and 1-butene copolymer block, A copolymer block of ethylene and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, Copolymer blocks of 1-butene and (conjugated) butadiene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, A polymer block of (conjugated) butadiene, or a part thereof, or a complete hydrogenated block thereof.

[0062] As the (co)polymer (A), a triblock copolymer consisting of (a) a polymer block of α-methylstyrene monomer - (b) a copolymer block or a partial or fully hydrogenated version block of two or more monomers selected from ethylene, propylene, 1-butene, butadiene, isoprene, 6,10-dimethyl-1-undecene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene - (a) a polymer block of α-methylstyrene monomer is more preferred.

[0063] The content of methylstyrene units, preferably α-methylstyrene units, in (co)polymer (A) is 10 to 40% by mass, preferably 15 to 40% by mass, and more preferably 20 to 35% by mass, based on monomers. Having the content of methylstyrene units, preferably α-methylstyrene units, in (co)polymer (A) within the above range suppresses the decrease in elastic modulus at high temperatures (100°C or higher, e.g., 120°C) and increases the adhesive strength at high temperatures (100°C or higher, e.g., 120°C).

[0064] If the (co)polymer (A) contains blocks of (b), the content of block units of (b) is 60 to 90% by mass, preferably 60 to 85% by mass, and more preferably 65 to 80% by mass, based on monomers. The content of block units of (b) in the (co)polymer (A) being within the above range allows it to maintain appropriate flexibility from room temperature to high temperatures (100°C or higher, for example, 120°C) and to have high adhesive strength from room temperature to high temperatures (100°C or higher, for example, 120°C).

[0065] The olefin polymer (B) in the adhesive composition of the present invention is one or more olefin polymers (B) comprising (c) a (co)polymer block or a portion thereof or a fully hydrogenated product block of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, wherein the content of the block of (c) exceeds 87% by mass and is 100% by mass or less on a monomer basis. In the present invention, when the block of (c) in the olefin polymer (B) is 100% by mass on a monomer basis, the polymer of the olefin polymer (B) consists only of a (co)polymer or a portion thereof or a fully hydrogenated product of one or more aliphatic monoolefins and / or one or more aliphatic polyenes. Furthermore, in the present invention, if the block of (c) in the olefin polymer (B) exceeds 87% by mass and is less than 100% by mass on a monomer basis, the polymer molecular chain of the olefin polymer (B) contains one or more (c) copolymer blocks of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, or a block of a part thereof or a fully hydrogenated product thereof, and one or more (copolymer blocks) other than the block of (c).

[0066] The block in (c) is (c1) a (co)polymer block of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, or (c2) a polymer block formed by polymerization of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, wherein some or all of the double bonds are hydrogenated after polymerization.

[0067] In other words, (c1) is a portion formed by polymerization using one type of aliphatic monoolefin as a monomer, a portion formed by copolymerization using two or more types of aliphatic monoolefins as monomers, a portion formed by polymerization using one type of aliphatic polyene as a monomer, a portion formed by copolymerization using two or more types of aliphatic polyenes as monomers, or a portion formed by copolymerization using one or more types of aliphatic monoolefins and one or more types of aliphatic polyenes as monomers.

[0068] Furthermore, (c2) is a portion formed by polymerization using one type of aliphatic polyene as a monomer, a portion formed by copolymerization using two or more types of aliphatic polyenes as monomers, or a portion formed by copolymerization using one or more types of aliphatic monoolefins and one or more types of aliphatic polyenes as monomers, and furthermore, a portion formed by hydrogenation of some or all of the double bonds after polymerization.

[0069] The aliphatic monoolefins related to block (c) are linear or branched aliphatic monoolefins having 2 or more carbon atoms, preferably 2 to 13. Examples of aliphatic monoolefins related to block (c) include ethylene, propylene, 1-butene, 2-butene, isobutylene, 1-pentene, 2-pentene, 2-methyl-1-butene, 2-methyl-2-butene, 3-methyl-1-butene, 1-hexene, 2-hexene, 3-hexene, 2-methyl-1-pentene, 2-methyl-2-pentene, 4-methyl-1-pentene, 4-methyl-2-pentene, n-heptene, isoheptene, n-octene, isooctene, n-nonene, isooctene, n-decene, isodecene, n-undecene, isoundecene, 6,10-dimethyl-1-undecene, and the like.

[0070] The aliphatic polyenes in block (c) are compounds having two or more double bonds. Examples of aliphatic polyenes in block (c) include linear or branched aliphatic conjugated diolefins having 4 or more carbon atoms, preferably 4 to 15; linear or branched aliphatic unconjugated diolefins having 4 or more carbon atoms, preferably 4 to 15; and aliphatic cyclic polyenes having 6 or more carbon atoms, preferably 6 to 18, more preferably 6 to 15. Examples of aliphatic conjugated diolefins related to the block in (c) include 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 3-methyl-1,3-pentadiene, 1,3-hexadiene, 1,3-cyclohexadiene, 1,3-heptadiene, 1,3-octadiene, 2-methyl-1,3-octadiene, myrcene, (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, etc. An example of an aliphatic non-conjugated diolefin related to the block in (c) is 1,4-hexadiene. Examples of aliphatic cyclic polyenes related to the block in (c) include ethylidene norbornene, dicyclopentadiene, vinyl norbornene, etc.

[0071] As for the block in (c), copolymer blocks of two or more monomers selected from ethylene, propylene, 1-butene, isobutylene, butadiene, isoprene, 6,10-dimethyl-1-undecene, (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, ethylidene norbornene, dichloropentadiene, and vinyl norbornene, or partially or completely hydrogenated thereof, are particularly preferred in that they have high adhesive strength at room temperature of about 25°C.

[0072] Such a block (c) is preferably, (i) Ethylene and 1-butene copolymer block, A copolymer block of ethylene and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, Copolymer blocks of 1-butene and (conjugated) butadiene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, (Conjugated) butadiene polymer blocks or parts thereof or complete hydrogenated blocks, (ii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, (conjugated) isoprene polymer blocks, parts thereof, or complete hydrogenated blocks (iii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, (conjugated)butadiene, and (conjugated)isoprene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of (conjugated) butadiene and (conjugated) isoprene, or partial or complete hydrogenated product blocks thereof, (iv) Isobutylene polymer block (v) Copolymer block of ethylene and 6,10-dimethyl-1-undecene, Copolymer blocks of ethylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof or complete hydrogenated blocks, (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene polymer blocks, parts thereof, or complete hydrogenated blocks (vi) Copolymer block of ethylene, 1-butene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) butadiene and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, Copolymer blocks of ethylene, 1-butene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, (vii) Copolymer block of ethylene, propylene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of propylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, A copolymer block of ethylene, propylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) isoprene and 6,10-dimethyl-1-undecene, or parts thereof, or fully hydrogenated blocks, Copolymer blocks of ethylene, propylene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of propylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) isoprene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of propylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof, or complete hydrogenated blocks, (viii) (Conjugated) butadiene polymer block, (ix) It is a polymer block of (conjugated) isoprene. (x) A copolymer block of ethylene, propylene, and ethylidene norbornene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, butene, and ethylidene norbornene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and vinylnorbornene, or a partial or complete hydrogenated block thereof, A copolymer block of ethylene, butene, and vinylnorbornene, or a part thereof or a fully hydrogenated block, A copolymer block of ethylene, propylene, and dichloropentadiene, or a partial or complete hydrogenated product block thereof, This is a copolymer block of ethylene, propylene, and 1,4-hexadiene, or a partial or complete hydrogenated version thereof.

[0073] (c) Block is more preferably: (i) Ethylene and 1-butene copolymer block, A copolymer block of ethylene and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, Copolymer blocks of 1-butene and (conjugated) butadiene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, (Conjugated) butadiene polymer blocks or parts thereof or complete hydrogenated blocks, (ii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, (conjugated) isoprene polymer blocks, parts thereof, or complete hydrogenated blocks (iii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, (conjugated)butadiene, and (conjugated)isoprene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of (conjugated) butadiene and (conjugated) isoprene, or partial or complete hydrogenated product blocks thereof, (iv) Isobutylene polymer block (v) Copolymer block of ethylene and 6,10-dimethyl-1-undecene, Copolymer blocks of ethylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof or complete hydrogenated blocks, (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene polymer blocks, parts thereof, or complete hydrogenated blocks (vi) Copolymer block of ethylene, 1-butene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) butadiene and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, Copolymer blocks of ethylene, 1-butene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, (vii) Copolymer block of ethylene, propylene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of propylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, A copolymer block of ethylene, propylene, (conjugated) isoprene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) isoprene and 6,10-dimethyl-1-undecene, or parts thereof, or fully hydrogenated blocks, Copolymer blocks of ethylene, propylene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of propylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, (conjugated) isoprene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) isoprene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of propylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, propylene, (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof, or complete hydrogenated blocks, That is the case.

[0074] (c) Block is more preferably: (i) Ethylene and 1-butene copolymer block, A copolymer block of ethylene and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, Copolymer blocks of 1-butene and (conjugated) butadiene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, (Conjugated) butadiene polymer blocks or parts thereof or complete hydrogenated blocks, (ii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, (conjugated) isoprene polymer blocks, parts thereof, or complete hydrogenated blocks (iii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, (conjugated)butadiene, and (conjugated)isoprene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of (conjugated) butadiene and (conjugated) isoprene, or partial or complete hydrogenated product blocks thereof, (iv) Isobutylene polymer block (v) Copolymer block of ethylene and 6,10-dimethyl-1-undecene, Copolymer blocks of ethylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof or complete hydrogenated blocks, (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene polymer blocks, parts thereof, or complete hydrogenated blocks (vi) Copolymer block of ethylene, 1-butene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) butadiene and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, Copolymer blocks of ethylene, 1-butene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, A copolymer block of (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or a partial or complete hydrogenated copolymer block thereof.

[0075] (c) Block is particularly preferred, (i) Ethylene and 1-butene copolymer block, A copolymer block of ethylene and (conjugated) butadiene, or a partial or complete hydrogenated product block thereof, Copolymer blocks of 1-butene and (conjugated) butadiene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, and (conjugated) butadiene, or a partial or complete hydrogenated block thereof, (Conjugated) butadiene polymer blocks or parts thereof or complete hydrogenated blocks, (ii) Ethylene and propylene copolymer block, A copolymer block of ethylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of propylene and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, A copolymer block of ethylene, propylene, and (conjugated) isoprene, or a partial or complete hydrogenated product block thereof, (conjugated) isoprene polymer blocks or parts thereof or complete hydrogenated blocks, (iv) Isobutylene polymer block, (v) Copolymer block of ethylene and 6,10-dimethyl-1-undecene, Copolymer blocks of ethylene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or parts thereof or complete hydrogenated blocks, (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene polymer blocks, parts thereof, or complete hydrogenated blocks (vi) Copolymer block of ethylene, 1-butene, and 6,10-dimethyl-1-undecene, A copolymer block of ethylene, (conjugated) butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated product block thereof. Copolymer blocks of 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or partial or complete hydrogenated blocks thereof, A copolymer block of ethylene, 1-butene, (conjugated)butadiene, and 6,10-dimethyl-1-undecene, or a partial or complete hydrogenated block thereof, Copolymer blocks of (conjugated) butadiene and 6,10-dimethyl-1-undecene, or parts thereof, or complete hydrogenated blocks, Copolymer blocks of ethylene, 1-butene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of (conjugated) butadiene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, Copolymer blocks of ethylene, 1-butene, (conjugated)butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or partial or complete hydrogenated blocks thereof, A copolymer block of (conjugated) butadiene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or a partial or complete hydrogenated copolymer block thereof.

[0076] In the olefin polymer (B), the content of (c) a (co)polymer block or a portion thereof or a fully hydrogenated block of one or more aliphatic monoolefins and / or one or more aliphatic polyenes is more than 87% by mass and 100% by mass or less, more preferably 90-100% by mass, more preferably more than 95% by mass and 100% by mass or less, more preferably 96-100% by mass, and more preferably 100% by mass, based on monomers. The above range for the content of the block of (c) in the olefin polymer (B) results in high tackiness at room temperature of about 25°C, and high tackiness at high temperatures (100°C or higher, for example, 120°C). In other words, it is possible to simultaneously impart flexibility at room temperature and suppress softening at high temperatures, resulting in high sealing performance (tackiness) at both room temperature and high temperatures.

[0077] In the olefin polymer (B), (co)polymer blocks other than the block in (c) may be present, provided that the amount is less than 13% by mass based on monomers.

[0078] Examples of (co)polymer blocks other than block (c) relating to such olefin polymers (B) include (d) polymer blocks of styrene or monomers having a styrene structure.

[0079] The block in (d) is a polymer block of styrene or monomers having a styrene structure, and is formed by the polymerization of styrene (CH2=CH-C6H5) or monomers having a styrene structure.

[0080] Examples of styrene or monomers having a styrene structure related to block (d) include styrene, α-methylstyrene, β-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-propylstyrene, 4-isopropylstyrene, 4-n-butylstyrene, 4-t-butylstyrene, 4-n-hexylstyrene, 4-cyclohexylstyrene, 4-octylstyrene, 4-dodecylstyrene, 2,4-dimethylstyrene, 2,4-diisopropylstyrene, 2,4,6-trimethylstyrene, 1-vinylnaphthalene, 2-vinylnaphthalene, vinylanthracene, N,N-diethyl-4-aminoethylstyrene, vinylpyridine, 4-methoxystyrene, 4-vinylstyrene, 1,1-diphenylethylene, and the like.

[0081] Blocks of (d) include polymer blocks of styrene, and copolymer blocks of one or more monomers selected from styrene, α-methylstyrene, β-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-propylstyrene, 4-isopropylstyrene, 4-n-butylstyrene, 4-t-butylstyrene, 4-n-hexylstyrene, 4-cyclohexylstyrene, 4-octylstyrene, 4-dodecylstyrene, 2,4-dimethylstyrene, 2,4-diisopropylstyrene, 2,4,6-trimethylstyrene, 1-vinylnaphthalene, 2-vinylnaphthalene, vinylanthracene, N,N-diethyl-4-aminoethylstyrene, vinylpyridine, 4-methoxystyrene, 4-vinylstyrene, and 1,1-diphenylethylene. Furthermore, if a monomer block containing less than 13% by mass on a monomer basis is selected as block (d), the (co)polymer (A) and the olefin polymer (B) can be a single copolymer. If block (d) is not a monomer block containing less than 13% by mass on a monomer basis, the (co)polymer (A) and the olefin polymer (B) will be separate copolymers.

[0082] As an olefin polymer (B), a triblock copolymer consisting of (d) a polymer block of styrene or a monomer having a styrene structure - (c) a copolymer block or a part thereof or a fully hydrogenated block of one or more monomers selected from ethylene, propylene, 1-butene, isobutylene, butadiene, isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene - (d) a polymer block of styrene or a monomer having a styrene structure, diblock copolymer Any block copolymer is acceptable, but a diblock copolymer is more preferred, and the diblock copolymer may also contain a triblock copolymer, comprising (d) a polymer block of styrene or a monomer having a styrene structure - (c) a copolymer block of one or more monomers selected from ethylene, propylene, 1-butene, isobutylene, butadiene, isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene, or a part thereof or a fully hydrogenated block.

[0083] In the olefin polymer (B), the content of block (d) is less than 13% by mass, preferably 10% by mass or less, more preferably less than 5% by mass, more preferably 4% by mass or less, and more preferably 0% by mass, based on the monomer. The above range for the content of block (d) in the olefin polymer (B) results in high tackiness at room temperature (around 25°C) and high tackiness at high temperatures (100°C or higher, for example, 120°C). In other words, it is possible to simultaneously impart flexibility at room temperature and suppress softening at high temperatures, resulting in high sealing performance (tackiness) at both room temperature and high temperatures.

[0084] The olefin polymer (B) is preferably a copolymer of one or more α-olefins selected from ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene, or a copolymer of one or more α-olefins selected from ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene and an aliphatic polyene selected from ethylidene norbornene, dicyclopentadiene, hexadiene, vinyl norbornene, butadiene and isoprene.

[0085] The olefin polymer (B) is preferably a diene rubber selected from butyl rubber, natural rubber, isoprene rubber, butadiene rubber, and styrene-butadiene rubber, or a partially or fully hydrogenated diene rubber thereof.

[0086] The tackifier (C) in the adhesive composition of the present invention enhances the tackiness of the adhesive layer and includes, for example, phenol resins, terpene resins, rosin resins, hydrogenated rosin resins, coumarone resins, terpene phenol resins, hydrogenated terpene phenol resins, aromatic hydrocarbon resins, aliphatic hydrocarbon resins, xylene-formaldehyde resins, and the like. More specifically, the tackifier (C) can be a terpene resin, a terpene phenol resin, a hydrogenated terpene resin, a hydrogenated terpene phenol resin, an aromatic hydrocarbon resin, an aliphatic hydrocarbon resin, or a xylene-formaldehyde resin. Preferably, the tackifier (C) is one or more selected from terpene phenol resins, hydrogenated terpene phenol resins, phenol resins, xylene-formaldehyde resins, rosin resins, and hydrogenated rosin resins.

[0087] The softening point of the tackifier (C) is preferably 80 to 180°C, more preferably 100 to 170°C. The hydroxyl value of the tackifier (C) is preferably 5 to 200 mg KOH / g, more preferably 10 to 120 mg KOH / g.

[0088] In the adhesive composition of the present invention, the ratio of the content of (co)polymer (A) to the total content of (co)polymer (A) and olefin polymer (B) (((co)polymer (A) / ((co)polymer (A) + olefin polymer (B))) × 100) is 5 to 95% by mass, preferably 10 to 95% by mass, more preferably 25 to 95% by mass, and more preferably 40 to 95% by mass. By having the ratio of the content of (co)polymer (A) to the total content of (co)polymer (A) and olefin polymer (B) within the above range, it is possible to achieve both high tackiness at high temperatures (100°C or higher, for example 120°C) and high tackiness at room temperature of about 25°C.

[0089] In the adhesive composition of the present invention, the ratio of the content of tackifier (C) to the total content of (co)polymer (A) and olefin polymer (B) ((tackifier (C) / ((co)polymer (A) + olefin polymer (B))) × 100) is 5 to 150% by mass, preferably 10 to 120% by mass, and more preferably 30 to 90% by mass. By having the ratio of the content of tackifier (C) to the total content of (co)polymer (A) and olefin polymer (B) within the above range, it is possible to achieve both high tackiness at high temperatures (100°C or higher, for example 120°C) and high tackiness at room temperature of about 25°C.

[0090] The adhesive composition of the present invention may contain an antioxidant (D) in addition to the (co)polymer (A), the olefin polymer (B), and the tackifier (C). Examples of antioxidants (D) include amine-based, phenol-based, benzimidazole-based, phosphoric acid-based, and organic thioacid-based antioxidants.

[0091] When the adhesive composition of the present invention contains an antioxidant (D), the ratio of the content of the antioxidant (D) to the total content of the (co)polymer (A) and the olefin polymer (B) ((antioxidant (D) / ((co)polymer (A) + olefin polymer (B))) × 100) is 0.10 to 1.0% by mass, preferably 0.15 to 0.75% by mass, and more preferably 0.25 to 0.50% by mass. By having the ratio of the content of the antioxidant (D) to the total content of the (co)polymer (A) and the olefin polymer (B) within the above range, it is possible to suppress the decrease in adhesive strength caused by deterioration due to heat or light.

[0092] Furthermore, in addition to the (co)polymer (A), the olefin polymer (B), and the tackifier (C), the adhesive composition of the present invention may contain various additives used in the adhesive composition as needed, within a range that does not impair the effects of the present invention.

[0093] The adhesive composition of the present invention may contain a leveling agent (surfactant) (E) as an additive. Examples of leveling agents (surfactants) (E) include: silicone-based leveling agents such as polyester-modified silicone, polyether-modified silicone, polyether-polyester-modified silicone, silicone-modified (meth)acrylic resin, carbinol-modified silicone, amino-modified silicone, polydimethylsiloxane modified with carboxyl, ether, epoxy, etc., alkyl-modified silicone, alkyl-aralkyl-modified silicone, higher fatty acid ester-modified silicone, phenyl-modified silicone, carboxyl-modified silicone, epoxy-modified silicone, and fluorine-modified silicone; straight silicones such as polydimethylsiloxane, polyphenylsiloxane, polymethylphenylsiloxane, and polymethylhydrodienesiloxane; acrylic polymers, and silicone-modified acrylics. Examples of leveling agents include acrylic polymers such as yl polymers, fluorine-modified acrylic polymers, (meth)acrylic copolymers, and polyether-modified (meth)acrylic compounds; fluorine-based leveling agents such as perfluoroalkenyl carboxylates, perfluoroalkenyl sulfonates, perfluoroalkenyl phosphates, perfluoroalkyl polyoxyethylene ethers, perfluoroalkyl carboxylates, perfluoroalkyl sulfonates, and perfluoroalkyl phosphates; vinyl polymers such as vinyl ether polymers; acetylene glycol-based leveling agents; and olefin polymers such as low molecular weight polyethylene, low molecular weight polypropylene, and modified olefin polymers such as ethylene-(meth)acrylic copolymers and acid-modified polyolefins. Other examples of leveling agents (surfactants) include nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, fluorine-based surfactants, alkoxylated surfactants, hyperbranched polyethers, sulfosuccinates, tetramethyldecanediols, and alkoxyl-modified tetramethyldecanediols.

[0094] The adhesive composition of the present invention is obtained by mixing a (co)polymer (A), an olefin polymer (B), and a tackifier (C), along with an antioxidant (D) and a leveling agent (E) as needed, in a solvent, then mixing, stirring, or kneading using a stirrer, and then applying the mixture to an object to which an adhesive layer is to be formed, followed by heating and removing the solvent.

[0095] The solvent is not particularly limited and includes aliphatic hydrocarbons, aromatic hydrocarbons, ketones, esters, ethers, and alcohols, with aromatic hydrocarbons being preferred. The amount of solvent used is appropriately selected depending on the application, coating method, and coating thickness.

[0096] In the second embodiment of the present invention, the adhesive composition (R) comprises 100 parts by mass of a hydrogenated α-methylstyrene-butadiene block copolymer having an α-methylstyrene unit content of 29% by mass on a monomer basis, and 50 parts by mass of a terpene phenol resin as an adhesive. The ratio of the peel strength value at 25°C, the ratio of the peel strength value at 100°C, and the ratio of the peel strength value at 120°C to the peel strength value at 25°C is all 2.50 or higher, preferably 2.75 or higher. In other words, when the peel strength value at 25°C of an adhesive composition (R) comprising 100 parts by mass of a hydrogenated α-methylstyrene-butadiene block copolymer having an α-methylstyrene unit content of 29% by mass on a monomer basis, and 50 parts by mass of a terpene phenol resin as an adhesive is set to 1.00, the relative ratios of the peel strength values ​​at 25°C, 100°C, and 120°C of the adhesive composition of the second embodiment of the present invention are all 2.50 or higher, preferably all 2.75 or higher. More specifically, the procedure is as follows: First, the peel strength of the adhesive composition (R) is measured at 25°C to obtain the peel strength value of the adhesive composition (R) at 25°C. Next, the peel strength of the second embodiment of the adhesive composition of the present invention is measured at 25°C, 100°C, and 120°C, respectively, to obtain the peel strength values ​​of the second embodiment of the adhesive composition of the present invention at 25°C, 100°C, and 120°C. Then, the ratio of the peel strength values ​​of the second embodiment of the adhesive composition of the present invention at 25°C, 100°C, and 120°C to the peel strength value of the adhesive composition (R) at 25°C is determined. For example, if the peel strength value of adhesive composition (R) at 25°C is X [N / mm], and the peel strength values ​​of the second embodiment of the adhesive composition of the present invention at 25°C, 100°C, and 120°C are Y1 [N / mm], Y2 [N / mm], and Y3 [N / mm], respectively, then in the second embodiment of the adhesive composition of the present invention, all values ​​of Y1 / X, Y2 / X, and Y3 / X are 2.50 or higher, preferably 2.75 or higher. The peel strength mentioned above refers to the peel strength obtained by the T-shaped peel test according to the operating procedure in the Examples section.

[0097] Copolymer (A) has a high elastic modulus at high temperatures (100°C or higher, for example, 120°C), and when combined with tackifier (C), it exhibits excellent tackiness at high temperatures. Olefin polymer (B) is flexible at room temperature of about 25°C, and when combined with tackifier (C), it exhibits excellent tackiness at room temperature of about 25°C. Therefore, the adhesive composition of the present invention, by containing (A), (B), and (C), becomes an adhesive composition with excellent tackiness over a wide temperature range.

[0098] Styrene-based block copolymers, such as poly(styrene-butadiene-styrene), are known as thermoplastic elastomers. Polystyrene blocks are called hard segments and are glassy at room temperature, while polybutadiene blocks are called soft segments and are rubbery at room temperature. Styrene-based thermoplastic elastomers exhibit rubber elasticity at room temperature because the hard segments act as crosslinking points. However, because the glass transition temperature of polystyrene is around 100°C, it loses its rubber elasticity and its modulus decreases at temperatures above 100°C. On the other hand, poly-α-methylstyrene contained in (co)polymer (A) has a higher glass transition temperature than polystyrene, and (co)polymer (A) does not easily lose its modulus at temperatures above 100°C. Therefore, the adhesive composition of the present invention, by using (co)polymer (A), becomes an adhesive composition with excellent adhesiveness at high temperatures (100°C or higher, for example, 120°C).

[0099] On the other hand, if the (co)polymer (A) is used without being combined with (B), the elastic modulus at room temperature of about 25°C becomes high, and the tackiness decreases.

[0100] Therefore, in the adhesive composition of the present invention, the ratio of the content of (co)polymer (A) to the total content of (co)polymer (A) and olefin polymer (B) (((co)polymer (A) / ((co)polymer (A) + olefin polymer (B))) × 100) is 5 to 95% by mass, preferably 10 to 95% by mass, preferably 25 to 95% by mass, and more preferably 40 to 95% by mass, so that flexibility is maintained even at room temperature of about 25°C. Thus, the adhesive composition of the present invention, by using olefin polymer (B), becomes an adhesive composition with excellent tackiness at room temperature of about 25°C. However, if olefin polymer (B) is used without being combined with (A), the tackiness at temperatures above 100°C is almost lost.

[0101] As described above, the present invention provides an adhesive composition with excellent adhesiveness over a wide temperature range by combining a (co)polymer (A) with excellent adhesiveness at high temperatures, (B) with excellent adhesiveness at low temperatures, and a tackifier (C).

[0102] The adhesive composition of the present invention may contain one or more copolymers (F) selected from polyphenylene ether copolymers, styrene-maleic anhydride copolymers, styrene-N-phenylmaleimide copolymers, and styrene-N-phenylmaleimide copolymer-maleic anhydride copolymers, wherein the copolymer has a glass transition temperature of 140°C or higher.

[0103] In the adhesive composition of the present invention, the content of copolymer (F) is 0 to 50% by mass, preferably 0 to 30% by mass, and more preferably 0 to 20% by mass, relative to (co)polymer (A).

[0104] The adhesive composition of the present invention is used to enhance the adhesion to sealing targets such as elastic rubber materials, resin materials, metal materials, paper materials, or cork materials, which are the main materials of gaskets, sealing materials, etc. Therefore, the adhesive composition of the present invention is formed on the surface of elastic rubber materials, resin materials, metal materials, paper materials, or cork materials, which are the main materials of gaskets, sealing materials, etc.

[0105] Applications of the adhesive composition of the present invention include adhesive layers formed on sheet-shaped gaskets, flooring materials, sealing materials for the inside of automobile doors, cushioning materials for fuel tanks, sealing materials for electronic components, cushioning materials for lithium-ion batteries, sealing materials between solar panels and support members in solar cell modules, sealing materials for electronic equipment, and sealing materials for electrolytic devices.

[0106] The sheet-like gasket of the present invention is characterized by having an adhesive layer made of the adhesive composition of the present invention. Examples of the sheet-like gasket of the present invention include a sheet-like gasket having a sheet-like elastic rubber material, resin material, metal material, paper material or cork material, and an adhesive layer made of the adhesive composition of the present invention formed on the surface of the elastic rubber material, resin material, metal material, paper material or cork material. The sheet-like elastic rubber material or resin material may or may not have a metal sheet or resin sheet inside. Furthermore, the elastic rubber material, resin material, metal material, paper material or cork material used in the sheet-like gasket of the present invention may be provided with a primer layer to further improve adhesive strength.

[0107] The flooring material of the present invention is characterized by having an adhesive layer made of the adhesive composition of the present invention. Examples of flooring materials of the present invention include flooring materials having an elastic rubber material, a resin material, a paper material or a cork material, and an adhesive layer made of the adhesive composition of the present invention formed on the surface of the elastic rubber material, a resin material, a paper material or a cork material.

[0108] The sealing material for the inside of an automobile door according to the present invention is characterized by having an adhesive layer made of the adhesive composition of the present invention. Examples of the sealing material for the inside of an automobile door according to the present invention include a sealing material for the inside of an automobile door having an elastic rubber material, a resin material, a paper material or a cork material and an adhesive layer made of the adhesive composition of the present invention formed on the surface of the elastic rubber material, a resin material, a paper material or a cork material.

[0109] The fuel tank cushioning material of the present invention is characterized by having an adhesive layer made of the adhesive composition of the present invention. Examples of fuel tank cushioning materials of the present invention include a fuel tank cushioning material having an elastic rubber material, a resin material, a paper material or a cork material, and an adhesive layer made of the adhesive composition of the present invention formed on the surface of the elastic rubber material, a resin material, a paper material or a cork material.

[0110] The sealing material for electronic components of the present invention is characterized by having an adhesive layer made of the adhesive composition of the present invention. Examples of the sealing material for electronic components of the present invention include a sealing material for electronic components having an elastic rubber material, a resin material, a paper material or a cork material, and an adhesive layer made of the adhesive composition of the present invention formed on the surface of the elastic rubber material, a resin material, a paper material or a cork material.

[0111] The present invention relates to a cushioning material for lithium-ion batteries, characterized by having an adhesive layer made of the adhesive composition of the present invention. Examples of the present invention relate to a cushioning material for lithium-ion batteries comprising an elastic rubber material, a resin material, a paper material, or a cork material, and an adhesive layer made of the adhesive composition of the present invention formed on the surface of the elastic rubber material, a resin material, a paper material, or a cork material.

[0112] The sealing material between the solar panel and the support member of a solar cell module of the present invention is characterized by having an adhesive layer made of the adhesive composition of the present invention. An example of the sealing material between the solar panel and the support member of a solar cell module of the present invention is a sealing material between the solar panel and the support member of a solar cell module having an elastic rubber material, resin material, paper material or cork material and an adhesive layer made of the adhesive composition of the present invention formed on the surface of the elastic rubber material, resin material, paper material or cork material.

[0113] The sealing material for electronic devices of the present invention is characterized by having an adhesive layer made of the adhesive composition of the present invention. Examples of sealing materials for electronic devices of the present invention include a sealing material for electronic devices having an elastic rubber material, a resin material, a paper material or a cork material, and an adhesive layer made of the adhesive composition of the present invention formed on the surface of the elastic rubber material, a resin material, a paper material or a cork material.

[0114] The sealing material for electrolytic devices of the present invention is characterized by having an adhesive layer made of the adhesive composition of the present invention. Examples of the sealing material for electrolytic devices of the present invention include a sealing material for electrolytic devices having an elastic rubber material, a resin material, a paper material or a cork material and an adhesive layer made of the adhesive composition of the present invention formed on the surface of the elastic rubber material, a resin material, a paper material or a cork material.

[0115] In the present invention, examples of elastic rubber materials include solid rubber materials and foamed rubber materials.

[0116] Examples of solid rubber materials include natural rubber (NR), butadiene rubber (BR), isoprene rubber (IR), butyl rubber (IIR), ethylene propylene rubber (EPM), ethylene propylene diene rubber (EPDM), ethylene butylene diene rubber (EBDM), nitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), chloroprene rubber, urethane rubber, acrylic rubber, silicone rubber, fluororubber, or hydrogenated versions thereof. In addition, olefin-based, styrene-based, urethane-based, ester-based, and amide-based thermoplastic elastomers can be used, and the aforementioned rubbers and thermoplastic elastomers may be mixed.

[0117] Foamed rubber is a porous rubber. Examples of foamed rubber include sponge-like foamed rubber with an open-cell structure, foamed rubber with an closed-cell structure, and semi-closed-cell foamed rubber. Specific examples of materials for foamed rubber include natural rubber (NR), butadiene rubber (BR), isoprene rubber (IR), butyl rubber (IIR), ethylene propylene rubber (EPM), ethylene propylene diene rubber (EPDM), ethylene butylene diene rubber (EBDM), nitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), chloroprene rubber, urethane rubber, acrylic rubber, silicone rubber, fluororubber, or hydrogenated versions thereof. In addition, olefin-based, styrene-based, urethane-based, ester-based, and amide-based thermoplastic elastomers can be used, and the aforementioned rubbers and thermoplastic elastomers may be mixed.

[0118] In the present invention, the resin material can be a variety of general-purpose resins such as polyethylene, polypropylene, polystyrene, acrylonitrile / butadiene / styrene resin (ABS resin), polyvinyl chloride resin, acrylonitrile / styrene resin, methacrylic resin, and vinyl chloride resin; a variety of general-purpose engineering resins such as polyamide, polyacetal, polycarbonate, modified polyphenylene ether, polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; a variety of super engineering resins such as polyphenylene sulfide, polyimide, polyetherimide, polyarylate, polysulfone, polyetheretherketone, and liquid crystal polymer; or a variety of thermosetting resins such as phenolic resin, urea resin, melamine resin, unsaturated polyester resin, and epoxy resin. The resin material can be appropriately selected depending on the application of the sealing material.

[0119] The sealing material of the present invention is a sealing material formed solely of an adhesive layer made of the adhesive composition of the present invention, and includes sealing materials formed solely of an adhesive layer made of the adhesive composition of the present invention, without using a base material such as elastic rubber, resin, metal, paper, or cork.

[0120] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited in any way by the following examples. [Examples]

[0121] (Examples and Comparative Examples) <Preparation of adhesive solution> 280g of copolymer A (listed in Tables 1 and 2) and 520g of solvent were weighed into a 1L pail and stirred at 250-300rpm for at least 4 hours using a three-one motor to obtain a 35% solution (Solution A). A 35% solution (Solution B) was prepared in the same manner for copolymer B (B1-B5) (listed in Table 1). 140g of tackifier C (C1, C2) (listed in Table 1) and 260g of solvent were weighed into a polypropylene container with a lid, shaken to dissolve, and obtained a 35% solution (Solution C). Mix solutions A, B, and C so that they have the compounding ratios and concentrations shown in Table 1, and stir them at 500 rpm for 1 to 5 minutes using a three-one motor to obtain an adhesive solution. In addition, the concentration was adjusted by appropriately adding a solvent so that the adhesive solution was in the range of 30 to 35%.

[0122] <Production of Adhesive Film> Cut the resin film to a length of 400 mm and a width of 150 mm. At this time, the length direction was set as up and down, and the width direction was set as left and right. Fix the resin film to the coating table and apply the adhesive solution using an applicator. Place the coated film in a high-temperature constant-temperature machine to thoroughly dry the solvent, and perform coating and drying on the back surface of the resin film in the same process to obtain a double-sided adhesive film. Measure the thickness of the portion 50 mm from the left and right ends of the adhesive film using a micrometer as the adhesive thickness. The material of the resin film is selected from polyethylene terephthalate, polyethylene naphthalate, polyvinyl chloride, polystyrene, syndiotactic polystyrene, and polyimide, and surface treatment may be performed as necessary.

[0123] <Cutting of Adhesive Film for Peel Test> Cut 20 mm from the left and right ends and 40 mm from the top and bottom ends of the adhesive film to obtain a film with a length of 320 mm and a width of 110 mm. Cut this film to a length of 35 mm and a width of 15 mm to obtain an adhesive film for peel test.

[0124] <Pressing of Adhesive Film for Peel Test> Press the adhesive film for peel test and the adherend (stainless steel plate). Cut the adherend to a length of 70 mm and a width of 15 mm and wash it with ethanol. Then, align the lower ends of the adherend and the adhesive film for peel test, and stick the adherend to both sides of the adhesive film so that no air enters. Use an air press machine to perform a pressing process (10 kgf / cm 2 ×15 seconds: 70 °C) to obtain a sample for peel test.

[0125] <T-Peel Test> A universal testing machine (Shimadzu Corporation, Autograph AGS-500NX) was used for the T-shaped peel test to measure adhesive strength. A jig with a chuck for tensile testing was attached to the testing machine, with a chuck distance of 50 mm. The workpiece was bent into a T-shape, held in place by the chucks, and the crosshead was raised at a speed of 50 mm / min to peel off the adhesive film in a T-shape. The test was performed at temperatures of 25°C, 100°C, and 120°C. When performing the test at temperatures above 100°C, the peel test was conducted while heating in a constant temperature bath. The peel strength [N / mm] was measured by dividing the test force [N] in the peel test by the width of 15 mm. For each measurement result, the relative value was calculated with the peel strength of Comparative Example 2 at 25°C set to "1.00". The results are shown in Tables 1 and 2.

[0126] [Table 1]

[0127] [Table 2]

[0128] A1: Hydrogenated α-methylstyrene-butadiene block copolymer, α-methylstyrene unit content (monomer basis): 29% by mass B1: Ethylene-propylene-diene copolymer (EPDM), (d) Block content: 0% by mass B2: Ethylene-butene-diene copolymer (EBDM), (d) Block content: 0% by mass B3: Ethylene-propylene copolymer, (d) Block content: 0% by mass β1: Hydrogenated styrene-isobutylene block copolymer, (d) Block content: 15% by mass based on styrene monomer β2: Hydrogenated styrene-butadiene block copolymer, (d) Block content: 20% by mass based on styrene monomer β3: Hydrogenated styrene-isoprene block copolymer, (d) Block content: 13% by mass based on styrene monomer C1: Terpene phenol resin C2: Terpene phenol resin C3: Hydrogenated terpene phenol resin

[0129] In Examples 1 to 9, the relative peel strength was 2.50 or higher at all temperatures (25°C, 100°C, and 120°C), compared to Comparative Example 2 at 25°C, where the peel strength was set to "1.00". On the other hand, in Comparative Examples 1, 2, 5, 7, and 10, the relative value of the peel strength at 25°C was less than 2.50 when the peel strength of Comparative Example 2 at 25°C was set to "1.00". In Comparative Examples 3 and 4, the relative value of the peel strength at 100°C was less than 2.50 when the peel strength of Comparative Example 2 at 25°C was set to "1.00". In Comparative Examples 3, 4, 5, 6, 8, 9, 11, 12, and 13, the relative value of the peel strength at 120°C was less than 2.50 when the peel strength of Comparative Example 2 at 25°C was set to "1.00".

[0130] Based on the above results, the adhesive layer made from the adhesive composition of the present invention exhibits high adhesive strength and excellent adhesion not only at room temperature of about 25°C but also at high temperatures (100°C or higher, for example, 120°C). Therefore, it is presumed that a sealing material on which an adhesive layer made from the adhesive composition of the present invention is formed on a sealing substrate such as a resin material, metal material, paper material, or cork material will exhibit excellent sealing performance not only at room temperature of about 25°C but also at high temperatures (100°C or higher, for example, 120°C).

[0131] Furthermore, based on the above results, the adhesive layer made from the adhesive composition of the present invention exhibits high adhesive strength and excellent adhesion not only at room temperature of about 25°C but also at high temperatures (100°C or higher, for example, 120°C). Therefore, it is presumed that a sealing material that uses only the adhesive layer made from the adhesive composition, without using a sealing substrate such as resin, metal, paper, or cork, will exhibit excellent sealing performance not only at room temperature of about 25°C but also at high temperatures (100°C or higher, for example, 120°C).

Claims

1. (a) A (co)polymer (A) containing a polymer block of methylstyrene monomer, (c) an olefin polymer (B) comprising a (co)polymer block or a portion thereof or a fully hydrogenated block of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, wherein the content of the block in (c) exceeds 87% by mass and is 100% by mass or less, based on monomers, Tackifier (C), An adhesive composition characterized by containing the following:

2. The adhesive composition according to claim 1, characterized in that the (co)polymer (A) is a copolymer comprising (b) a (co)polymer block or a portion or a fully hydrogenated block thereof of one or more aliphatic monoolefins and / or one or more aliphatic conjugated diolefins.

3. The adhesive composition according to claim 1 or 2, characterized in that the ratio of the content of the (co)polymer (A) to the total content of the (co)polymer (A) and the olefin polymer (B) (((co)polymer (A) / ((co)polymer (A) + olefin polymer (B))) × 100) is 5 to 95% by mass.

4. The adhesive composition according to claim 1 or 2, characterized in that the olefin polymer (B) is a (co)polymer of one or more α-olefins selected from ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene, or a polymer of one or more α-olefins selected from ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene and one or more aliphatic polyenes selected from ethylidene norbornene, dicyclopentadiene, hexadiene, vinyl norbornene, butadiene and isoprene.

5. The adhesive composition according to claim 1 or 2, characterized in that the olefin polymer (B) is a diene rubber selected from butyl rubber, natural rubber, isoprene rubber, butadiene rubber, and styrene-butadiene rubber, or a partially or fully hydrogenated diene rubber thereof.

6. The adhesive composition according to claim 1 or 2, characterized in that the tackifier (C) is one or more selected from terpene phenol resins, hydrogenated terpene phenol resins, phenol resins, xylene resins, and rosin-based resins.

7. The adhesive composition according to claim 1 or 2, characterized by containing one or more copolymers (F) which are aromatic copolymers selected from polyphenylene ether copolymers, styrene-maleic anhydride copolymers, styrene-N-phenylmaleimide copolymers, and styrene-N-phenylmaleimide copolymer-maleic anhydride copolymers, and which have a glass transition temperature of 140°C or higher.

8. The adhesive composition according to claim 1 or 2, characterized in that the methylstyrene unit content of the (co)polymer (A) is 10 to 40% by mass on a monomer basis.

9. The adhesive composition according to claim 1 or 2, characterized in that (b) is a copolymer block or a portion thereof or a fully hydrogenated block of one or more monomers selected from ethylene, propylene, 1-butene, isobutylene, butadiene, isoprene, 6,10-dimethyl-1-undecene and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene.

10. The adhesive composition according to claim 1 or 2, characterized in that the (co)polymer (A) is a triblock copolymer comprising (a) a polymer block of methylstyrene monomer - (b) a copolymer block or a portion thereof or a fully hydrogenated block of one or more monomers selected from ethylene, propylene, 1-butene, isobutylene, butadiene, isoprene, 6,10-dimethyl-1-undecene, and (6E)-7,11-dimethyl-3-methylidendodeca-1,6,10-triene - (a) a polymer block of methylstyrene monomer.

11. (a) A (co)polymer (A) containing a polymer block of methylstyrene monomer, (c) an olefin polymer (B) comprising a (co)polymer block or a portion thereof or a fully hydrogenated block of one or more aliphatic monoolefins and / or one or more aliphatic polyenes, Tackifier (C), It contains, The adhesive composition (R) comprises 100 parts by mass of a hydrogenated α-methylstyrene-butadiene block copolymer having an α-methylstyrene unit content of 29% by mass on a monomer basis, and 50 parts by mass of a terpene phenol resin as an adhesive, and the ratio of the peel strength value at 25°C, the ratio of the peel strength value at 100°C, and the ratio of the peel strength value at 120°C to the peel strength value at 25°C are all 2.50 or higher. An adhesive composition characterized by the following.

12. A sheet-like gasket characterized by having an adhesive layer made of the adhesive composition described in claim 1 or claim 11.

13. A flooring material characterized by having an adhesive layer made of the adhesive composition described in claim 1 or claim 11.

14. A sealing material for the inside of an automobile door, characterized by having an adhesive layer made of the adhesive composition described in claim 1 or claim 11.

15. A cushioning material for a fuel tank, characterized by having an adhesive layer made of the adhesive composition described in claim 1 or claim 11.

16. A sealing material for electronic components, characterized by having an adhesive layer made of the adhesive composition described in claim 1 or claim 11.

17. A cushioning material for lithium-ion batteries, characterized by having an adhesive layer made of the adhesive composition described in claim 1 or claim 11.

18. A sealing material between a solar panel and a support member of a solar cell module, characterized by having an adhesive layer made of the adhesive composition described in claim 1 or claim 11.

19. A sealing material for electronic equipment, characterized by having an adhesive layer made of the adhesive composition described in claim 1 or claim 11.

20. A sealing material for an electrolytic device, characterized by having an adhesive layer made of the adhesive composition described in claim 1 or claim 11.

21. A sealing material for an electrolytic device, characterized in that it is formed solely of an adhesive layer made of the adhesive composition described in claim 1 or claim 11.

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