Adhesive composition and adhesive tape

Abstract

An adhesive composition includes a beta-1,3-glucan derivative having an acyl group introduced in a beta-1,3-glucan, and a petroleum-based resin. An adhesive tape (1) is provided with an adhesive layer (3) formed of the adhesive composition.

Description

Technical Field

[0001] This invention relates to adhesive compositions and adhesive tapes. Background Technology

[0002] Adhesive compositions containing β-1,3-glucan derivatives with acyl groups introduced into β-1,3-glucan are known (see, for example, Patent Document 1 below). β-1,3-glucan derivatives are biologically derived polysaccharides, therefore the adhesive described in Patent Document 1 has a lower environmental impact compared to conventional petroleum-based adhesives.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-154723 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] Depending on the application, adhesive compositions are sometimes required to have excellent adhesion to olefin resins. Such applications are wide-ranging and diverse. Specifically, examples include food packaging materials, household containers, vehicle interior materials, wire sheathing materials, and building materials.

[0008] However, the adhesive composition described in Patent Document 1 has insufficient adhesion to olefin resins, which results in a failure to meet the above requirements.

[0009] The present invention provides adhesive compositions and adhesive tapes with excellent adhesion to olefin resins.

[0010] Solution for solving the problem

[0011] The present invention (1) comprises an adhesive composition comprising a β-1,3-glucan derivative having an acyl group introduced into β-1,3-glucan, and a petroleum-based resin.

[0012] The present invention (2) comprises the adhesive composition of (1), wherein the acyl group is represented by RCO-, and the R is an aliphatic hydrocarbon group having 10 or more and 16 or fewer carbon atoms.

[0013] The present invention (3) comprises the adhesive composition described in (1) or (2), wherein the petroleum-based resin is 10 parts by weight or more and 100 parts by weight or less relative to 100 parts by weight of the β-1,3-glucan derivative.

[0014] The present invention (4) includes an adhesive tape having a substrate layer and an adhesive layer, the adhesive layer being disposed on one side of the aforementioned substrate layer in the thickness direction and formed of any one of the adhesive compositions (1) to (3).

[0015] The effects of the invention

[0016] The adhesive compositions and adhesive tapes of the present invention exhibit excellent adhesion to olefin resins. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of one embodiment of the adhesive tape of the present invention.

[0018] Figure 2 This is a cross-sectional view of another embodiment of the adhesive tape.

[0019] Figure 3 This is a cross-sectional view of another embodiment of the adhesive tape.

[0020] Figure 4 This is a schematic diagram of the measurement of constant load peeling speed in the embodiment. Detailed Implementation

[0021] [Adhesive Composition]

[0022] The adhesive composition of the present invention comprises a β-1,3-glucan derivative and a petroleum-based resin.

[0023] [β-1,3-glucan derivatives]

[0024] β-1,3-glucan derivatives are the basic polymers in adhesive compositions. β-1,3-glucan derivatives are partially acylated compounds in which a portion of the hydroxyl groups in the glucose contained in β-1,3-glucan are acylated compounds with acyl groups introduced into β-1,3-glucan.

[0025] An acyl group is represented by RCO-. R can be, for example, a hydrocarbon group. Hydrocarbon groups can be, for example, aliphatic hydrocarbon groups, alicyclic hydrocarbon groups, and aromatic hydrocarbon groups, preferably aliphatic hydrocarbon groups. Hydrocarbon groups can be, for example, saturated aliphatic hydrocarbon groups and unsaturated aliphatic hydrocarbon groups, preferably saturated aliphatic hydrocarbon groups, i.e., alkyl groups. Alkyl groups can be, for example, straight-chain alkyl groups and branched alkyl groups, preferably straight-chain alkyl groups. The number of carbon atoms in an alkyl group is, for example, 3 or more, and also, for example, 17 or less. Straight-chain alkyl groups can be, for example, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecanyl, and octadecyl. Unsaturated aliphatic hydrocarbon groups can be, for example, alkenyl groups with 3 or more carbon atoms, preferably 5 or more, and also, for example, 18 or less. Alkenyl groups can be, for example, heptadecanyl.

[0026] The aliphatic hydrocarbon group (alkyl or alkenyl) preferably has 6 or more carbon atoms, more preferably 8 or more, and even more preferably 10 or more. Furthermore, it is preferably 16 or less, more preferably 14 or less. If the number of carbon atoms in the aliphatic hydrocarbon group is at least the lower limit and less than the upper limit mentioned above, the adhesion to olefin resins can be sufficiently improved.

[0027] Specific examples of acyl groups include butyryl (where R in RCO is C3H7), pentanoyl (where R in RCO is C4H9), and hexanoyl (where R in RCO is C5H9). 11 Examples), heptanyl (R in RCO is C6H) 13 Examples), octanoyl (R in RCO is C7H) 15 Examples), nonanoyl (R in RCO is C8H) 17 Examples), decanoyl (R in RCO is C9H) 19 Examples), lauroyl (i.e., dodecanoyl) (R in RCO is C 11 H 23 Examples), myristoyl (i.e., tetradecanoyl) (R in RCO is C 13 H 27 Examples), palmitoyl (i.e., hexadecanoyl) (R in RCO is C 15 H 31 Examples), stearoyl (i.e., octadecanoyl) (R in RCO is C 17 H 35 Examples), oleoyl group (R in RCO is C) 17 H 33 Examples), and nonadecanyl (R in RCO is C). 18 H 37Examples include lauroyl, myristoyl, and palmitoyl.

[0028] The types, properties and manufacturing methods of β-1,3-glucan derivatives are described, for example, in Japanese Patent Application Publication No. 2018-154723.

[0029] The proportion of β-1,3-glucan derivative in the solid component of the adhesive composition is, for example, 50% or more by weight, preferably 60% or more by weight, more preferably 70% or more by weight, and also, for example, 99% or less by weight, preferably 90% or less by weight, more preferably 80% or less by weight.

[0030] β-1,3-glucan derivatives via 1 Identification was performed using H-NMR and FT-IR spectroscopy. Detailed identification information is described in Japanese Patent Application Publication No. 2018-154723.

[0031] Petroleum-based resins

[0032] Petroleum-based resins, as tackifiers, enhance the adhesive strength of adhesive compositions against olefin resins. The adhesive compositions of this invention contain petroleum-based resins as tackifiers. Petroleum-based resins can improve the adhesive strength of adhesive compositions against olefin resins.

[0033] Examples of petroleum-based resins include aliphatic (C5) petroleum resins, aromatic (C9) petroleum resins, aliphatic / aromatic copolymers (C5 / C9) petroleum resins, their hydrides, their modifiers (e.g., maleic anhydride modifiers), coumarone resins, coumarone-indene resins, and styrene-based tackifiers. These can be used alone or in combination. From the viewpoint of improving adhesion to olefin resins, hydrides are preferably used as petroleum-based resins, and more preferably, hydrides of aromatic (C9) petroleum resins.

[0034] The hydrogenation rate in the hydride is not particularly limited. For example, the hydrogenation rate is 50% or more, and from the viewpoint of improving the adhesion to olefin resins, it is preferably 80% or more, and also, for example, 100% or less.

[0035] Relative to 100 parts by weight of the β-1,3-glucan derivative, the amount of petroleum-based resin is, for example, 5 parts by weight or more, preferably 10 parts by weight or more, more preferably 20 parts by weight or more, and further preferably, 150 parts by weight or less, preferably 100 parts by weight or less, more preferably 80 parts by weight or less, even more preferably 60 parts by weight or less, and particularly preferably 40 parts by weight or less. If the amount of petroleum-based resin is at or above the lower limit mentioned above, or if it is at or below the upper limit mentioned above, relative to 100 parts by weight of the β-1,3-glucan derivative, the adhesion to olefin resins can be further improved.

[0036] As a petroleum-based resin, commercially available products can be used.

[0037] Petroleum-based resins pass 1 Identification was performed using 1H-NMR spectroscopy, FT-IR spectroscopy, gel permeation chromatography, and / or mass spectrometry.

[0038] [additive]

[0039] The adhesive composition may also contain additives in appropriate proportions. Examples of additives include, for instance, other base polymers (acrylic resins), other tackifiers (rosin-based and terpene-based resins), viscosity modifiers, leveling agents, plasticizers, fillers, stabilizers, preservatives, and anti-aging agents.

[0040] In manufacturing the adhesive composition, a β-1,3-glucan derivative, a petroleum-based resin, and additives as needed are mixed. Alternatively, the above-mentioned components can be dissolved in an organic solvent to prepare a solution containing the adhesive composition. The solution is sometimes referred to as a "solution of the adhesive composition." Examples of organic solvents include low-polarity solvents and high-polarity solvents.

[0041] Examples of low-polarity solvents include aromatic compounds, alicyclic compounds, and saturated chain hydrocarbons. Examples of aromatic compounds include toluene. Examples of alicyclic compounds include cyclohexane and methylcyclohexane. Examples of saturated chain hydrocarbons include pentane, hexane, and heptane.

[0042] Examples of highly polar solvents include ketones, esters, and alcohols. Examples of ketones include methyl ethyl ketone. Examples of esters include ethyl acetate. Examples of alcohols include methanol and ethanol.

[0043] These organic solvents can be used alone or in combination. Preferred examples include the use of low-polarity solvents alone, and the use of low-polarity solvents and high-polarity solvents in combination.

[0044] An aqueous dispersion containing a binder composition can also be prepared by dispersing β-1,3-glucan derivatives and petroleum-based resins in water using emulsifiers and / or dispersants. It should be noted that the aqueous dispersion is sometimes referred to as an "aqueous dispersion of the binder composition".

[0045] Hot melt resins for adhesive compositions can also be prepared by mixing β-1,3-glucan derivatives and petroleum-based resins using a mixer or similar equipment. It should be noted that the term "hot melt resin" is sometimes used interchangeably with "hot melt resin" in the context of adhesive compositions.

[0046] The proportion of solid components in the solution or aqueous dispersion of the adhesive composition is, for example, 1% by weight or more, preferably 10% by weight or more, and also, for example, 50% by weight or less, preferably 40% by weight or less.

[0047] like Figure 1 As shown, a solution of the adhesive composition or an aqueous dispersion of the adhesive composition is coated onto the surface of the substrate sheet 2, and then dried by heating to form the adhesive layer 3. It should be noted that the aforementioned hot-melt resin can also be hot-melted and coated onto the surface of the substrate sheet 2, and then cooled to form the adhesive layer 3. This allows the manufacture of an adhesive tape 1 having a substrate sheet 2 and an adhesive layer 3.

[0048] For example, resin can be used as the material for the substrate sheet 2. Polyester can be used as an example of resin. The thickness of the substrate sheet 2 is 0.5 μm or more, and, for example, 900 μm or less.

[0049] The thickness of the adhesive layer 3 is, for example, 1 μm or more, and also, for example, 1000 μm or less. The thickness of the adhesive tape 1 is, for example, 2 μm or more, and also, for example, 1100 μm or less.

[0050] Furthermore, such as Figure 2 As shown, the adhesive tape 1 may also have a substrate sheet 2 and an adhesive layer 3 disposed on its surface and back respectively.

[0051] Or, such as Figure 3 As shown, a substrate-free adhesive tape 1 can also be obtained that does not use a substrate sheet 2 but only has an adhesive layer 3. The adhesive tape 1 consists only of the adhesive layer 3.

[0052] [Adhesive strength]

[0053] The adhesive force of the adhesive layer 3 to the polypropylene sheet at 23°C and 50% RH is, for example, 3.0 N / 20 mm or more, preferably 3.5 N / 20 mm or more, and also, for example, 20 N / 20 mm or less. The method for measuring the adhesive force of the adhesive layer 3 to the polypropylene sheet is described in detail in the following examples.

[0054] The constant load peel speed of the adhesive layer 3 on the polypropylene sheet at 23°C and 50% RH is, for example, 0.50 mm / h or less, preferably 0.20 mm / h or less, more preferably 0.10 mm / h or less, and even more preferably 0.05 mm / h or less, and also, for example, 0.00 mm / h or more. The method for determining the constant load peel speed of the adhesive layer 3 is described in detail in the following examples. A low constant load peel speed indicates excellent adhesion to olefin resins (i.e., high adhesion strength).

[0055] [Effects of adhesive compositions and adhesive tapes]

[0056] This adhesive composition contains a petroleum-based resin as an essential tackifier. Therefore, the adhesive composition and tape exhibit excellent adhesion to olefin resins. Consequently, the adhesive composition and tape can be used in a wide range of applications. Examples of applications include food packaging materials, household containers, vehicle interior materials, wire sheathing materials, and building materials.

[0057] In contrast, when the adhesive composition contains terpene-based or rosin-based resins as necessary tackifiers, it cannot sufficiently improve the adhesion to olefin resins. Therefore, the above-mentioned adhesive composition cannot be used for the aforementioned applications.

[0058] [Example of a modified adhesive tape]

[0059] In the variations, the same reference numerals are used to indicate the same components and processes as in the first embodiment, and detailed descriptions are omitted. Furthermore, unless otherwise specified, the variations can achieve the same effects as the first embodiment. Moreover, it is possible to appropriately combine an embodiment and its variations.

[0060] like Figure 1 Imaginary lines and Figure 2 As shown by the imaginary line, the modified adhesive tape 1 also has a release tab 4 disposed on the surface of the adhesive layer 3.

[0061] Example

[0062] The specific values ​​of mixing ratios (including proportions), physical property values, parameters, etc. used in the following description can replace the corresponding upper limit values ​​(defined as "less" or "less than") or lower limit values ​​(defined as "more than" or "exceeding") of the mixing ratios (including proportions), physical property values, parameters, etc., described in the "Specific Embodiments" above. Furthermore, in the following description, unless otherwise specified, "parts" and "%" are based on weight.

[0063] [Examples of the synthesis of β-1,3-glucan derivatives]

[0064] Synthesis example 1

[0065] Synthesis of myristylated β-1,3-glucan (R in RCO has 13 carbon atoms in the aliphatic hydrocarbon group)

[0066] 13.3 g of β-1,3-glucan (Euglena Co Ltd: 82.03 mmol of glucose fraction) and 1000 mL of dehydrated pyridine (Fujifilm and Kazumitsu Chemical Co., Ltd.) were added to a reaction vessel equipped with a cooling pipe, a nitrogen inlet pipe, a thermometer, and a stirrer. The mixture was stirred at 92°C under a nitrogen atmosphere for 0.5 hours. 133.05 mL of myristoyl chloride (492.2 mmol: Fujifilm and Kazumitsu Chemical Co., Ltd.) was added to the pyridine solution, and the mixture was heated to 92°C and stirred for 1 hour. This prepared the reaction mixture.

[0067] Then, a solid intermediate was obtained from the reaction mixture. First, one hour after the start of the reaction, 2000 mL of methanol was added to the reaction mixture, and the mixture was cooled to room temperature. The resulting solid was then removed and dissolved in 600 mL of toluene to prepare a toluene solution. The toluene solution was then injected into 2000 mL of stirred methanol to obtain a solid. The solid was washed by repeating the process of dissolving the solid in toluene and injecting it into methanol three times to obtain another solid. The solid was then dried under reduced pressure at 60 °C for 4 hours. This yielded myristylated β-1,3-glucan. In other words, myristylated β-1,3-glucan is a β-1,3-glucan derivative incorporating a myristoyl group into β-1,3-glucan.

[0068] Synthesis example 2

[0069] [Synthesis of palmitoylated β-1,3-glucan (R in RCO has 15 carbon atoms in the aliphatic hydrocarbon group)]

[0070] Palmitoylated β-1,3-glucan was obtained by proceeding with the same treatment as in Synthesis Example 1. However, the amount of myristoyl chloride (133.05 mL, 492.2 mmol) was replaced with palmitoyl chloride (150.21 mL, 492.2 mmol: Fujifilm and Koichi Pure Chemicals Co., Ltd.). In other words, palmitoylated β-1,3-glucan is a β-1,3-glucan derivative incorporating a palmitoyl group into β-1,3-glucan.

[0071] Synthesis example 3

[0072] Synthesis of lauroyl β-1,3-glucan (R in RCO has 11 carbon atoms in the aliphatic hydrocarbon group)

[0073] Lauroylated β-1,3-glucan was obtained by proceeding with the same treatment as in Synthesis Example 1. However, the amount of myristoyl chloride (133.05 mL, 492.2 mmol) was replaced with lauroyl chloride (113.81 mL, 492.2 mmol: Fujifilm Wōko Co., Ltd.). In other words, lauroylated β-1,3-glucan is a β-1,3-glucan derivative incorporating a lauroyl group into β-1,3-glucan.

[0074] Synthesis example 4

[0075] Synthesis of octanoyl β-1,3-glucan (R in RCO has 7 carbon atoms in the aliphatic hydrocarbon group)]

[0076] The same procedure as in Synthesis Example 1 was followed to obtain octanoyl β-1,3-glucan. However, the myristoyl chloride (133.05 mL, 492.2 mmol) was replaced with octanoyl chloride (84.18 mL, 492.2 mmol: Fujifilm Wōko Co., Ltd.). In other words, octanoyl β-1,3-glucan is a β-1,3-glucan derivative incorporating an octanoyl group into β-1,3-glucan.

[0077] Synthesis example 5

[0078] [Synthesis of butyrylated β-1,3-glucan (R in RCO has 3 carbon atoms in the aliphatic hydrocarbon group)]

[0079] Butyrylated β-1,3-glucan was obtained by proceeding with the same treatment as in Synthesis Example 1. However, the myristoyl chloride (133.05 mL, 492.2 mmol) was replaced with butyryl chloride (50.98 mL, 492.2 mmol: Fujifilm Wōko Co., Ltd.). In other words, butyrylated β-1,3-glucan is a β-1,3-glucan derivative incorporating a butyryl group into β-1,3-glucan.

[0080] Synthesis example 6

[0081] Synthesis of oleylamide β-1,3-glucan (R in RCO has 17 carbon atoms in the aliphatic hydrocarbon group)]

[0082] The same procedure as in Synthesis Example 1 was followed to obtain oleylated β-1,3-glucan. However, the myristoyl chloride 133.05 mL (492.2 mmol) was replaced with oleoyl chloride 162.38 mL (492.2 mmol: Fujifilm Wōko Co., Ltd.). In other words, oleylated β-1,3-glucan is a β-1,3-glucan derivative incorporating an oleyl group into β-1,3-glucan.

[0083] [Manufacturing of Adhesive Tape]

[0084] [Example 1]

[0085] Prepare a toluene solution of myristylated β-1,3-glucan (solid content concentration 10% by weight).

[0086] In addition, a toluene solution (solid content concentration 50% by weight) was prepared for Arkon P-125 (Arakawa Chemical Industry Co., Ltd., hydride of aromatic (C9 series) petroleum resin, hydrogenation rate 90-100%) as a petroleum-based resin.

[0087] Next, a toluene solution of myristoylated β-1,3-glucan and a toluene solution of Arkon P-125 were mixed and stirred, with the weight of Arkon P-125 relative to 30 parts by weight of myristoylated β-1,3-glucan. This yielded a toluene solution of the adhesive composition.

[0088] As the substrate sheet 2, a toluene solution of the adhesive composition is applied to the surface of a polyester substrate (Toray Industries, Inc.: Lumirror S-10, 25 μm thick) using an applicator (manufactured by TESTER SANGYO CO,.LTD.), dried at 50°C for 5 minutes, and further dried at 120°C for 5 minutes. Thus, an adhesive tape 1 having the substrate sheet 2 and an adhesive layer 3 with a thickness of 50 μm is manufactured.

[0089] [Example 2, Comparative Examples 1 and 2]

[0090] The adhesive composition and adhesive tape 1 were manufactured in the same manner as in Example 1. However, the type of tackifier was changed as shown below. The changes are also shown in Table 1.

[0091] In Example 2, Arkon M-125 (Arakawa Chemical Industry Co., Ltd., hydrogenated aromatic (C9 series) petroleum resin, hydrogenation rate 90-100%) was used instead of Arkon P-125.

[0092] In Comparative Example 1, rosin-based resin Super Ester A-125 (Arakawa Chemical Industry Co., Ltd.) was used instead of Arkon P-125.

[0093] In Comparative Example 2, terpene resin TO-125 (Arakawa Chemical Industry Co., Ltd.) was used instead of Arkon P-125.

[0094] [Examples 3 to 7]

[0095] The adhesive composition and adhesive tape 1 were manufactured in the same manner as in Example 1. However, the type of carbon atom number of the R (aliphatic hydrocarbon group) in the acyl group (RCO) introduced into the β-1,3-glucan derivative was changed as shown below. The changes are also shown in Table 2.

[0096] In Example 3, butyrylated β-1,3-glucan (R in RCO has 3 carbon atoms) was used instead of myristylated β-1,3-glucan (R in RCO has 13 carbon atoms).

[0097] In Example 4, octanoyl β-1,3-glucan (R in RCO has 7 carbon atoms) was used instead of myristoylated β-1,3-glucan (R in RCO has 13 carbon atoms).

[0098] In Example 5, lauroyl β-1,3-glucan (R in RCO has 11 carbon atoms in the aliphatic hydrocarbon group) was used instead of myristyl β-1,3-glucan (R in RCO has 13 carbon atoms in the aliphatic hydrocarbon group).

[0099] In Example 6, palmitoylated β-1,3-glucan (R in RCO has 15 carbon atoms) was used instead of myristoylated β-1,3-glucan (R in RCO has 13 carbon atoms).

[0100] In Example 7, oleyl β-1,3-glucan (R in RCO has 17 carbon atoms) was used instead of myristyl β-1,3-glucan (R in RCO has 13 carbon atoms).

[0101] [Examples 8 to 12]

[0102] The adhesive composition and adhesive tape 1 were prepared in the same manner as in Example 1. However, the weight parts of Arkon P-125 relative to 100 parts by weight of myristylated β-1,3-glucan were varied as shown below. The variations are also shown in Table 3.

[0103] In Example 8, the weight of Arkon P-125 relative to 100 parts by weight of myristylated β-1,3-glucan was changed from 30 parts by weight to 5 parts by weight.

[0104] In Example 9, the weight of Arkon P-125 relative to 100 parts by weight of myristylated β-1,3-glucan was changed from 30 parts by weight to 10 parts by weight.

[0105] In Example 10, the weight of Arkon P-125 relative to 100 parts by weight of myristylated β-1,3-glucan was changed from 30 parts by weight to 50 parts by weight.

[0106] In Example 11, the weight of Arkon P-125 relative to 100 parts by weight of myristylated β-1,3-glucan was changed from 30 parts by weight to 70 parts by weight.

[0107] In Example 12, the weight of Arkon P-125 relative to 100 parts by weight of myristylated β-1,3-glucan was changed from 30 parts by weight to 90 parts by weight.

[0108] [evaluate]

[0109] The adhesive layers of each embodiment and comparative example were evaluated for the following aspects. These results are shown in Tables 1 to 3. It should be noted that Example 1 is included in Tables 1 to 3 for easy comparison with other embodiments.

[0110] [Adhesive strength]

[0111] Cut adhesive tape 1 into pieces 20mm wide and 70mm long to make a sample.

[0112] The adhesive layer 3 of the sample was pressed onto a polypropylene plate by reciprocating a 2 kg roller at 23°C and 50% RH. It was then left in this environment for 30 minutes. The peel force (N / 20 mm) at a peel speed of 300 mm / min and a peel angle of 180° was then measured using an Autograph AG-IS precision universal testing machine (Shimadzu Corporation), yielding the "adhesive force". The adhesive force was measured at 23°C and 50% RH.

[0113] [Constant load peeling speed]

[0114] Prepare the same sample as for the adhesion test. Press the sample onto a polypropylene sheet using a 2kg roller in an environment of 23°C and 50% RH. Then, after placing it in this environment for 30 minutes, test it again at 23°C and 50% RH. Figure 4 As shown, the polypropylene plate 6 is held horizontally with the side to which sample 5 is attached facing down.

[0115] A 10g (0.098N) load F was suspended at one end of sample 5 along its length at a peel angle of 90 degrees, and the peel distance (mm) was measured after 24 hours. The constant load peel rate (mm / hour) was then determined.

[0116] In Example 3, sample 5 fell after 24 hours, so the measurement time was changed to 1 minute.

[0117] [Table 1]

[0118]

[0119] [Table 2]

[0120]

[0121] [Table 3]

[0122]

[0123] It should be noted that the above technical solutions are provided as illustrative embodiments of the present invention, but these are merely illustrative and not limiting. Variations of the present invention that will be apparent to those skilled in the art are included within the scope of the claims.

[0124] Industrial availability

[0125] The adhesive composition is used as a material for the adhesive layer of an adhesive tape.

[0126] Explanation of reference numerals in the attached figures

[0127] 1. Adhesive tape

[0128] 3 Adhesive layer

Claims

1. An adhesive composition comprising: β-1,3-glucan derivatives with acyl groups introduced into β-1,3-glucan, and Petroleum-based resins. Relative to 100 parts by weight of the β-1,3-glucan derivative, the petroleum-based resin is 10 parts by weight or more and 70 parts by weight or less. The acyl group is represented by RCO-. The R is an aliphatic hydrocarbon group with 10 or more but less than 16 carbon atoms.

2. An adhesive tape comprising an adhesive layer formed from the adhesive composition of claim 1.

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