ADHESIVE AGENT, ADHESIVE TAPE, AND METHOD FOR AFFIXING ELECTRONIC COMPONENTS OR VEHICLE-MOUNTED COMPONENTS

Abstract

The present invention aims to provide an adhesive capable of exhibiting excellent adhesive force while having a high bio-derived carbon content, an adhesive tape containing the adhesive, and a method for fixing an electronic device component or an in-vehicle component. Provided is an adhesive containing a (meth)acrylic copolymer that contains 48% by weight or more of structural units derived from a monomer A of a formula (1) containing bio-derived carbon and/or a monomer B of a formula (2) containing bio-derived carbon, and that has a glass transition temperature of −20° C. or lower.

Claims

1. An adhesive comprising a (meth)acrylic copolymer that contains 48% by weight or more of structural units derived from a monomer A of the following formula (1) containing bio-derived carbon and/or a monomer B of the following formula (2) containing bio-derived carbon, and that has a glass transition temperature of −20° C. or lower: ##STR00002## wherein in the formula (1), R.sup.1 is H or CH.sub.3, R.sup.2 is —C.sub.nH.sub.2n+1, and n is an integer of 7 to 14; in the formula (2), R.sup.3 is —C(═O)C.sub.mH.sub.2m+1, and m is an integer of 7 to 13; and the carbon in R.sup.2 and R.sup.3 is bio-derived carbon.

2. The adhesive according to claim 1, wherein the monomer A comprises at least one selected from the group consisting of n-octyl (meth)acrylate, lauryl (meth)acrylate, and decyl (meth)acrylate.

3. The adhesive according to claim 1, wherein the monomer A comprises lauryl acrylate and/or lauryl methacrylate.

4. The adhesive according to claim 1, wherein the monomer B comprises vinyl caprate and/or vinyl laurate.

5. The adhesive according to claim 1, wherein the (meth)acrylic copolymer contains structural units derived from the monomer A, and a structural unit derived from lauryl acrylate and/or lauryl methacrylate constitutes 48% by weight or more of the structural units derived from the monomer A.

6. The adhesive according to claim 1, wherein the (meth)acrylic copolymer contains structural units derived from the monomer A, a structural unit derived from lauryl acrylate constitutes 10 to 90% by weight of the structural units derived from the monomer A, and a structural unit derived from lauryl methacrylate constitutes 10 to 90% by weight of the structural units derived from the monomer A.

7. The adhesive according to claim 1, wherein the (meth)acrylic copolymer contains a structural unit derived from an alkyl (meth)acrylate having a C16-C24 alkyl group.

8. The adhesive according to claim 1, comprising 10 to 50 parts by weight of a bio-derived rosin tackifier and/or a bio-derived terpene tackifier relative to 100 parts by weight of the (meth)acrylic copolymer.

9. An adhesive tape comprising an adhesive layer containing the adhesive according to claim 1.

10. The adhesive tape according to claim 9, further comprising a substrate, wherein the substrate is a film containing a polyester or polyamide.

11. The adhesive tape according to claim 9, further comprising a foam substrate.

12. The adhesive tape according to claim 9, which is used for fixing an electronic device component or an in-vehicle component.

13. A method for fixing an electronic device component or an in-vehicle component using the adhesive tape according to claim 9.

Description

DESCRIPTION OF EMBODIMENTS

[0070] The embodiments of the present invention are more specifically described in the following with reference to examples. These examples are not intended to limit the present invention.

<Monomer A>

(1) Preparation of Lauryl Acrylate Containing Bio-Derived Carbon

[0071] Lauryl acrylate was prepared by esterifying acrylic acid with lauryl alcohol. The lauryl alcohol was prepared by hydrolyzing fat and oil contained in palm kernel oil, coconut oil, and the like, fractionating the resulting fatty acid to recover lauric acid, and hydrogen-reducing the lauric acid.

(2) Preparation of lauryl methacrylate containing bio-derived carbon

[0072] Lauryl methacrylate was prepared by esterifying methacrylic acid with lauryl alcohol obtained by the above method.

(3) Preparation of n-Decyl Methacrylate Containing Bio-Derived Carbon

[0073] n-Decyl methacrylate was prepared by esterifying methacrylic acid with n-decyl alcohol. The n-decyl alcohol was prepared by hydrolyzing fat and oil contained in palm kernel oil, coconut oil, and the like, fractionating the resulting fatty acid to recover capric acid, and hydrogen-reducing the capric acid.

(4) Preparation of n-Octyl Acrylate Containing Bio-Derived Carbon

[0074] n-Octyl acrylate was prepared by esterifying acrylic acid with n-octyl alcohol. The n-octyl alcohol was prepared by hydrolyzing fat and oil contained in palm kernel oil, coconut oil, and the like, fractionating the resulting fatty acid to recover caplyric acid, and hydrogen-reducing the caplyric acid.

(5) Preparation of Isobornyl Acrylate Containing Bio-Derived Carbon

[0075] Isobornyl acrylate was prepared by reacting acrylic acid and camphene. The acrylic acid and camphene were reacted by a method disclosed in JP 2006-69944 A. The camphene was obtained by isomerizing α-pinene obtained from pine resin or turpentine.

<Monomer B>

(1) Preparation of Vinyl Laurate Containing Bio-Derived Carbon

[0076] Vinyl laurate was prepared by hydrolyzing fat and oil contained in palm kernel oil, coconut oil, and the like, fractionating the resulting fatty acid to recover lauric acid, and vinylating the lauric acid.

(2) Preparation of Vinyl Caprate Containing Bio-Derived Carbon

[0077] Vinyl caprate was prepared by hydrolyzing fat and oil contained in palm kernel oil, coconut oil, and the like, fractionating the resulting fatty acid to recover capric acid, and vinylating the capric acid.

<Monomer Containing Bio-Derived Carbon Other than Monomer a and Monomer B>

[0078] Stearyl acrylate was prepared by esterifying acrylic acid with stearyl alcohol. Stearyl alcohol was prepared by hydrolyzing fat and oil contained in palm oil, palm kernel oil, soybean oil, rapeseed oil, and the like, fractionating the resulting fatty acid to recover stearic acid, and hydrogen-reducing the stearic acid.

<Non-Bio-Derived Monomer>

[0079] The following commercial monomers were provided as non-bio-derived monomers.

(1) 2-ethylhexyl acrylate (produced by Mitsubishi Chemical Corporation, glass transition temperature: −70° C.)
(2) butyl acrylate (produced by Mitsubishi Chemical Corporation, glass transition temperature: −55° C.)
(3) ethyl acrylate (produced by Mitsubishi Chemical Corporation, glass transition temperature: −20° C.)
(4) methyl acrylate (produced by Mitsubishi Chemical Corporation, glass transition temperature: −8° C.)
(5) acrylic acid (produced by Nippon Shokubai Co., Ltd. glass transition temperature: 106° C.)
(6) hydroxyethyl acrylate (produced by Osaka Organic Chemical Industry Ltd., glass transition temperature: −15° C.)

<Cross-Linking Agent>

[0080] A commercial polyisocyanate cross-linking agent (produced by Tosoh Corporation, Coronate L-45) was provided as a cross-linking agent.

<Tackifier>

[0081] The following commercial tackifiers containing bio-derived carbon were provided as tackifiers.

(1) terpene phenol resin A (produced by Yasuhara Chemical Co., Ltd., G150, softening point: 150° C., bio-derived carbon content: 67% by weight)
(2) polymerized rosin ester resin B (hydroxy value: 46, softening point: 152° C., bio-derived carbon content: 95% by weight)
(3) hydrogenated rosin ester resin C (produced by Arakawa Chemical Industries Ltd., KE359, hydroxy value: 40, softening point: 100° C., bio-derived carbon content: 95% by weight)

Example 1

(1) Preparation of (Meth)Acrylic Copolymer

[0082] A reaction vessel was charged with ethyl acetate as a polymerization solvent and the ethyl acetate was bubbled with nitrogen. The reaction vessel was heated while nitrogen was flowed thereinto, thereby starting reflux. Subsequently, to the reaction vessel was added a polymerization initiator solution prepared by 10 times dilution of 0.1 parts by weight of azobisisobutyronitrile as a polymerization initiator in ethyl acetate. Then, 34 parts by weight of the lauryl acrylate, 48 parts by weight of the n-octyl acrylate, 14 parts by weight of the ethyl acrylate, 3 parts by weight of the acrylic acid, and 0.5 parts by weight of the hydroxyethyl acrylate were added dropwise over two hours. After the dropwise addition, the polymerization initiator solution prepared by 10 times dilution of 0.1 parts by weight of azobisisobutyronitrile as a polymerization initiator in ethyl acetate was added again to the reaction vessel, and the polymerization reaction was allowed to proceed for four hours. Thus, a (meth)acrylic copolymer-containing solution was obtained.

[0083] The glass transition temperature of the obtained (meth)acrylic copolymer was measured using a differential scanning calorimeter (DSC6220, produced by Seiko Instruments Inc). The glass transition temperature was −44° C.

[0084] The obtained (meth)acrylic copolymer was diluted 50 times in tetrahydrofuran (THF). The obtained dilution was filtered through a filter (material: polytetrafluoroethylene, pore size: 0.2 μm), whereby a measurement sample was prepared. This measurement sample was fed into a gel permeation chromatograph (produced by Waters Corporation, 2690 Separations Model) and analyzed by GPC at a sample flow rate of 1 mL/min and a column temperature of 40° C. to measure the molecular weight of the (meth)acrylic copolymer in terms of polystyrene. Thus, the weight average molecular weight was determined. The weight average molecular weight was 720,000.

(2) Production of Adhesive Tape

[0085] To the obtained (meth)acrylic copolymer-containing solution were added 3 parts by weight of the cross-linking agent, 10 parts by weight of the terpenephenolic resin A, 14 parts by weight of the polymerized rosin ester resin B, and 10 parts by weight of the hydrogenated rosin ester resin C relative to 100 parts by weight of the (meth)acrylic copolymer, whereby an adhesive solution was prepared. The adhesive solution was applied to a release-treated PET film having a thickness of 75 μm such that the adhesive layer after drying would have a thickness of 50 μm, and then dried at 110° C. for five minutes. This adhesive layer was placed on a release-treated PET film having a thickness of 75 μm and aged at 40° C. for 48 hours, whereby an adhesive tape (non-support type) was obtained.

[0086] The release film on one surface of the obtained adhesive tape was removed. The adhesive tape was attached to a PET film having a thickness of 50 μm and cut to a 20 mm×40 mm flat rectangular shape. The release film of the other surface of the adhesive tape was removed, whereby a specimen was prepared. The weight of the specimen was measured. The specimen was immersed in ethyl acetate at 23° C. for 24 hours, taken out of the ethyl acetate, and dried at 110° C. for 1 hour. The weight of the specimen after drying was measured, and the gel fraction was calculated by the following equation. The gel fraction was 38% by weight.

Gel fraction (% by weight)=100×(W.sub.5−W.sub.3)/(W.sub.4−W.sub.3)

(W.sub.3: the weight of the PET film, W.sub.4: the weight of the specimen before ethyl acetate immersion, W.sub.5: the weight of the specimen after ethyl acetate immersion and drying)

Examples 2 to 28 and Comparative Examples 1 to 5

[0087] Adhesive tapes were obtained as in Example 1 except that monomers of the (meth)acrylic copolymer and tackifiers compounded into the adhesive tapes were as shown in Tables 1 to 4.

[0088] In Example 21, a double-sided adhesive tape was produced. The double-sided adhesive tape had adhesive layers (each having a thickness of 25 μm) on both surfaces of a substrate. The substrate used was a film having a thickness of 25 μm formed from nylon 610 (produced by Toray Industries Inc., CM2001), a plant-derived polyamide resin.

[0089] In Example 22, a double-sided adhesive tape was produced by the method below. The double-sided adhesive tape had adhesive layers (each having a thickness of 50 μm) on both surfaces of a foam substrate.

[0090] The adhesive solution was applied to a release-treated PET film having a thickness of 75 μm such that the adhesive layer after drying would have a thickness of 50 μm, and then dried at 110° C. for five minutes to give an adhesive layer A. The adhesive layer A was placed on a PE foam substrate having a thickness of 100 μm and an expansion ratio of 3 times and pressurized with a rubber roller or the like, whereby a laminate was prepared that had the adhesive layer A on a surface of the release film. Next, another release film was provided, to which the adhesive solution was applied such that the adhesive layer after drying would have a thickness of 50 μm. The applied solution was then dried at 110° C. for five minutes to give an adhesive layer B. The adhesive layer B was attached to the surface of the foam substrate of the laminate opposite to the adhesive layer A. The adhesive layer B was similarly pressurized with a rubber roller or the like and aged at 40° C. for 48 hours, whereby a double-sided adhesive tape was obtained that had adhesive layers on both surfaces of a foam substrate.

(Evaluation)

[0091] The adhesive tapes obtained in the examples and comparative examples were evaluated as follows.

[0092] Tables 1 to 4 show the results.

(1) Bio-Derived Carbon Content

[0093] The bio-derived carbon content of the obtained adhesive tape was measured in conformity with ASTM D6866.

(2) Measurement of Plane Direction Peeling Force

[0094] A 10 mm wide×10 mm double-sided adhesive tape was interposed between two SUS plates, bonded to the plates by pressure bonding for 10 seconds using a 5-kg weight, and then aged at 23° C. and a humidity of 50% for 24 hours. The resulting laminate was placed on a fixture, with the two SUS plates being horizontal. The lower SUS plate was fixed, and the upper SUS plate was pulled in the perpendicular direction at a pulling speed of 10 mm/min to determine the force (N) at which the tape was peeled. The plane direction peeling force (Pa) was determined by the following calculation.

Plane direction peeling force (Pa)=force (N) at which tape is peeled/tape area (m.sup.2)

[0095] The adhesive tape of Example 22 had a very high plane direction peeling force. The foam substrate broke when a load exceeded 0.8 MPa.

(3) Measurement of Shear Direction Peeling Force

[0096] A 10 mm wide×10 mm double-sided adhesive tape was interposed between two SUS plates, bonded to the plates by pressure bonding for 10 seconds using a 5-kg weight, and then aged at 23° C. and a humidity of 50% for 24 hours. The resulting laminate was placed on a fixture, with the two SUS plates being vertical. One of the SUS plates was fixed with the lower holder, and the other SUS plate was fixed with the upper holder. The upper holder was then pulled in the perpendicular direction at a pulling speed of 10 mm/min to determine the force (N) at which the tape was peeled. The shear direction peeling force (Pa) was determined by the following calculation.

Shear direction peeling force (Pa)=force (N) at which tape is peeled/tape area (m.sup.2)

[0097] The adhesive tape of Example 22 had a very high shear direction peeling force. The foam substrate broke when a load exceeded 0.8 MPa.

TABLE-US-00001 TABLE 1 Example 1 2 3 4 5 6 (Meth)acrylic Monomer A Lauryl acrylate 34 — 48 48 34 — copolymer Lauryl methacrylate — 34 — — 34 97 n-Decyl methacrylate — — — — — — n-Octyl acrylate 48 48 — — — — n-Heptyl acrylate — — — — — — Isobornyl acrylate — — — — — — Monomer B Vinyl laurate — — — 19 — — Vinyl caprate — — — — — — Bio-derived Stearyl acrylate — — — — — — monomer Isostearyl acrylate — — — — — — 2-Decyl tetradecanyl — — — — — — acrylate Non-bio-derived 2-Ethylhexyl acrylate — — 48 — 29 — monomer Butyl acrylate — — — 29 — — Ethyl acrylate 14 — — — — — Methyl acrylate — 14 — — — — Acrylic acid 3 3 3 3 3 3 Hydroxyethyl acrylate 0.5 0.5 0.5 0.5 0.5 0.5 Glass transition temperature (° C.) −44 −51 −52 −51 −46 −39 Weight average molecular weight (×10.sup.4) 72 65 78 62 71 59 Cross-linking agent (parts by weight) 3 3 2 3 3 3 Tackifier Terpene phenol resin A 10 10 10 10 10 10 (parts by weight) Polymerized rosin ester resin B 14 14 14 14 14 14 Hydrogenated rosin ester resin C 10 10 10 10 10 10 Thickness of adhesive tape (μm) 50 50 50 50 50 50 Gel fraction of adhesive tape (% by weight) 38 41 39 42 34 34 Thickness of substrate (μm) (nylon 610) — — — — — — Thickness of substrate (μm) — — — — — — (foam substrate, expansion ratio 3 times) Evaluation Bio-derived carbon % by weight 71 70 52 67 62 77 content Plane direction MPa 0.97 0.94 0.91 0.96 1.05 0.98 peeling force Shear direction MPa 1.12 1.25 0.90 0.93 1.27 1.95 peeling force Example 7 8 9 10 (Meth)acrylic Monomer A Lauryl acrylate 19 48 48 48 copolymer Lauryl methacrylate 77 48 48 48 n-Decyl methacrylate — — — — n-Octyl acrylate — — — — n-Heptyl acrylate — — — — Isobornyl acrylate — — — — Monomer B Vinyl laurate — — — — Vinyl caprate — — — — Bio-derived Stearyl acrylate — — — — monomer Isostearyl acrylate — — — — 2-Decyl tetradecanyl — — — — acrylate Non-bio-derived 2-Ethylhexyl acrylate — — — — monomer Butyl acrylate — — — — Ethyl acrylate — — — — Methyl acrylate — — — — Acrylic acid 3 3 3 3 Hydroxyethyl acrylate 0.5 0.5 0.5 0.5 Glass transition temperature (° C.) −33 −27 −27 −27 Weight average molecular weight (×10.sup.4) 62 57 57 57 Cross-linking agent (parts by weight) 3 1 1.5 3 Tackifier Terpene phenol resin A 10 0 0 10 (parts by weight) Polymerized rosin ester resin B 14 0 5 14 Hydrogenated rosin ester resin C 10 0 5 10 Thickness of adhesive tape (μm) 50 50 50 50 Gel fraction of adhesive tape (% by weight) 33 31 29 27 Thickness of substrate (μm) (nylon 610) — — — — Thickness of substrate (μm) — — — — (foam substrate, expansion ratio 3 times) Evaluation Bio-derived carbon % by weight 78 76 78 79 content Plane direction MPa 1.07 0.81 1.04 1.28 peeling force Shear direction MPa 1.35 0.85 0.92 1.41 peeling force

TABLE-US-00002 TABLE 2 Example 11 12 13 14 15 16 (Meth)acrylic Monomer A Lauryl acrylate 48 77 — — — — copolymer Lauryl methacrylate 48 19 — — — — n-Decyl methacrylate — — 48 — — — n-Octyl acrylate — — — 48 68 97 n-Heptyl acrylate — — — — — — Isobornyl acrylate — — — — — — Monomer B Vinyl laurate — — — — — — Vinyl caprate — — — — — — Bio-derived Stearyl acrylate — — — — — — monomer Isostearyl acrylate — — — — — — 2-Decyl tetradecanyl — — — — — — acrylate Non-bio-derived 2-Ethylhexyl acrylate — — 48 48 29 — monomer Butyl acrylate — — — — — — Ethyl acrylate — — — — — — Methyl acrylate — — — — — — Acrylic acid 3 3 3 3 3 3 Hydroxyethyl acrylate 0.5 0.5 0.5 0.5 0.5 0.5 Glass transition temperature (° C.) −27 −23 −76 −75 −75 −73 Weight average molecular weight (×10.sup.4) 57 63 73 77 72 69 Cross-linking agent (parts by weight) 3.5 3 2 1 1 0.5 Tackifier Terpene phenol resin A 15 10 10 10 10 0 (parts by weight) Polymerized rosin ester resin B 20 14 14 14 14 0 Hydrogenated rosin ester resin C 15 10 10 10 10 0 Thickness of adhesive tape (μm) 50 50 50 50 50 50 Gel fraction of adhesive tape (% by weight) 31 35 31 34 33 35 Thickness of substrate (μm) (nylon 610) — — — — — — Thickness of substrate (μm) — — — — — — (foam substrate, expansion ratio 3 times) Evaluation Bio-derived carbon % by weight 80 80 50 49 60 71 content Plane direction MPa 1.09 1.09 0.85 0.87 0.93 0.82 peeling force Shear direction MPa 1.19 0.81 0.90 0.97 0.94 0.87 peeling force Example 17 18 19 20 (Meth)acrylic Monomer A Lauryl acrylate — — — — copolymer Lauryl methacrylate — — — — n-Decyl methacrylate — — — — n-Octyl acrylate 97 — 48 48 n-Heptyl acrylate — 97 — — Isobornyl acrylate — — 19 — Monomer B Vinyl laurate — — — — Vinyl caprate — — — 19 Bio-derived Stearyl acrylate — — — — monomer Isostearyl acrylate — — — — 2-Decyl tetradecanyl — — — — acrylate Non-bio-derived 2-Ethylhexyl acrylate — — — — monomer Butyl acrylate — — 29 29 Ethyl acrylate — — — — Methyl acrylate — — — — Acrylic acid 3 3 3 3 Hydroxyethyl acrylate 0.5 0.5 0.5 0.5 Glass transition temperature (° C.) −73 −31 −47 −67 Weight average molecular weight (×10.sup.4) 69 63 79 74 Cross-linking agent (parts by weight) 1 1.7 3 3 Tackifier Terpene phenol resin A 10 10 10 10 (parts by weight) Polymerized rosin ester resin B 14 14 14 14 Hydrogenated rosin ester resin C 10 10 10 10 Thickness of adhesive tape (μm) 50 50 50 50 Gel fraction of adhesive tape (% by weight) 35 51 41 38 Thickness of substrate (μm) (nylon 610) — — — — Thickness of substrate (μm) — — — — (foam substrate, expansion ratio 3 times) Evaluation Bio-derived carbon % by weight 75 73 61 62 content Plane direction MPa 0.96 1.13 0.88 0.89 peeling force Shear direction MPa 0.98 0.81 1.01 0.85 peeling force

TABLE-US-00003 TABLE 3 Example 21 22 23 24 25 (Meth)acrylic Monomer A Lauryl acrylate 48 48 77 — 34 copolymer Lauryl methacrylate 48 48 — 77 34 n-Decyl methacrylate — — — — — n-Octyl acrylate — — — — — n-Heptyl acrylate — — — — — Isobornyl acrylate — — — — — Monomer B Vinyl laurate — — — — — Vinyl caprate — — — — — Bio-derived Stearyl acrylate — — — — — monomer Isostearyl acrylate — — — — — 2-Decyl tetradecanyl — — 19 19 29 acrylate Non-bio-derived 2-Ethylhexyl acrylate — — — — — monomer Butyl acrylate — — — — — Ethyl acrylate — — — — — Methyl acrylate — — — — — Acrylic acid 3 3 3 3 3 Hydroxyethyl acrylate 0.5 0.5 0.5 0.5 0.5 Glass transition temperature (° C.) −27 −27 −51 −25 −37 Weight average molecular weight (×10.sup.4) 57 57 59 55 51 Cross-linking agent (parts by weight) 3 3 3 3 3 Tackifier Terpene phenol resin A 10 10 10 10 10 (parts by weight) Polymerized rosin ester resin B 14 14 14 14 14 Hydrogenated rosin ester resin C 10 10 10 10 10 Thickness of adhesive tape (μm) 75 200 50 50 50 Gel fraction of adhesive tape (% by weight) 27 27 34 29 31 Thickness of substrate (μm) (nylon 610) 25 — — — — Thickness of substrate (μm) — 100 — — — (foam substrate, expansion ratio 3 times) Evaluation Bio-derived carbon % by weight 74 70 81 78 80 content Plane direction MPa 1.31 Substrate 1.02 1.28 1.14 peeling force broke Shear direction MPa 1.46 Substrate 0.91 1.32 1.54 peeling force broke Example 26 27 28 (Meth)acrylic Monomer A Lauryl acrylate 48 — 34 copolymer Lauryl methacrylate — 48 34 n-Decyl methacrylate — — — n-Octyl acrylate — — — n-Heptyl acrylate — — — Isobornyl acrylate — — — Monomer B Vinyl laurate — — — Vinyl caprate — — — Bio-derived Stearyl acrylate — — — monomer Isostearyl acrylate 48 48 29 2-Decyl tetradecanyl — — — acrylate Non-bio-derived 2-Ethylhexyl acrylate — — — monomer Butyl acrylate — — — Ethyl acrylate — — — Methyl acrylate — — — Acrylic acid 3 3 3 Hydroxyethyl acrylate 0.5 0.5 0.5 Glass transition temperature (° C.) −55 −40 −48 Weight average molecular weight (×10.sup.4) 58 52 54 Cross-linking agent (parts by weight) 3 3 3 Tackifier Terpene phenol resin A 10 10 10 (parts by weight) Polymerized rosin ester resin B 14 14 14 Hydrogenated rosin ester resin C 10 10 10 Thickness of adhesive tape (μm) 50 50 50 Gel fraction of adhesive tape (% by weight) 41 38 43 Thickness of substrate (μm) (nylon 610) — — — Thickness of substrate (μm) — — — (foam substrate, expansion ratio 3 times) Evaluation Bio-derived carbon % by weight 83 81 80 content Plane direction MPa 0.87 1.18 1.31 peeling force Shear direction MPa 0.95 1.42 1.45 peeling force

TABLE-US-00004 TABLE 4 Comparative Example 1 2 3 4 5 (Meth)acrylic Monomer A Lauryl acrylate — — — — 29 copolymer Lauryl methacrylate — — — — — n-Decyl methacrylate — — — — — n-Octyl acrylate — — — — — n-Heptyl acrylate — — — — — Isobornyl acrylate — — — 48 — Monomer B Vinyl laurate — — — — — Vinyl caprate — — — — — Bio-derived Stearyl acrylate — — 97 — — monomer Isostearyl acrylate — — — — — 2-Decyl tetradecanyl — — — — — acrylate Non-bio-derived 2-Ethylhexyl acrylate 34 — — — 68 monomer Butyl acrylate 49 78 — 48 — Ethyl acrylate — 19 — — — Methyl acrylate 15 — — — — Acrylic acid 3 3 3 3 3 Hydroxyethyl acrylate 0.1 0.1 0.5 0.5 0.5 Glass transition temperature (° C.) −58 −54 21 −6 −56 Weight average molecular weight (×10.sup.4) 70 75 64 63 66 Cross-linking agent (parts by weight) 1 1 3 3 1 Tackifier Terpene phenol resin A 10 10 10 10 10 (parts by weight) Polymerized rosin ester resin B 14 14 14 14 14 Hydrogenated rosin ester resin C 10 10 10 10 10 Thickness of adhesive tape (μm) 50 50 50 50 50 Gel fraction of adhesive tape (% by weight) 37 41 23 36 40 Thickness of substrate (μm) (nylon 610) — — — — — Thickness of substrate (μm) — — — — — (foam substrate, expansion ratio 3 times) Evaluation Bio-derived carbon % by weight 24 25 85 53 41 content Plane direction MPa 0.76 0.81 0.58 0.52 0.66 peeling force Shear direction MPa 0.78 0.85 0.35 0.54 0.79 peeling force

INDUSTRIAL APPLICABILITY

[0098] The present invention can provide an adhesive capable of exhibiting excellent adhesive force while having a high bio-derived carbon content, an adhesive tape containing the adhesive, and a method for fixing an electronic device component or an in-vehicle component.