ADHESIVE AGENT COMPOSITION, ADHESIVE TAPE, AFFIXING METHOD FOR ELECTRONIC DEVICE COMPONENT OR IN-VEHICLE COMPONENT, AND PRODUCTION METHOD FOR ELECTRONIC DEVICE COMPONENT OR IN-VEHICLE COMPONENT

Abstract

The present invention aims to provide an adhesive composition that can exhibit excellent adhesion to both smooth surfaces and rough surfaces. The present invention also aims to provide an adhesive tape including an adhesive layer containing the adhesive composition, as well as a method for fixing and a method for producing an electronic device component or an in-vehicle component using the adhesive tape. Provided is an adhesive composition containing an acrylic copolymer containing a structural unit derived from n-heptyl (meth)acrylate.

Claims

1. An adhesive composition comprising an acrylic copolymer containing a structural unit derived from n-heptyl (meth)acrylate.

2. The adhesive composition according to claim 1, wherein an amount of the structural unit derived from n-heptyl (meth)acrylate in the acrylic copolymer is 48% by weight or more.

3. The adhesive composition according to claim 1, wherein an amount of a structural unit derived from a (meth)acrylate having an alkyl group having a carbon number of 8 or greater in the acrylic copolymer is 50% by weight or less.

4. The adhesive composition according to claim 1, wherein the acrylic copolymer further contains a structural unit derived from a crosslinkable functional group-containing monomer.

5. The adhesive composition according to claim 4, wherein an amount of the structural unit derived from a crosslinkable functional group-containing monomer in the acrylic copolymer is 0.01% by weight or more and 20% by weight or less.

6. The adhesive composition according to claim 4, wherein the crosslinkable functional group-containing monomer is a hydroxy group-containing monomer, and the acrylic copolymer has a value X represented by the following equation (1) of 2 or greater and 50 or smaller: $\begin{array}{cc}\left[\mathrm{Math}.1\right]& \\ X=\left({\mathrm{Mw}}_{\mathrm{polymer}}\right)\times \frac{W_{\mathrm{OH}}}{W_{total}}\times \frac{n}{M_{\mathrm{OH}}}& \left(1\right)\end{array}$ wherein Mw.sub.polymer represents a weight average molecular weight of the acrylic copolymer, W.sub.OH represents an amount (part or parts by weight) of the structural unit derived from the hydroxy group-containing monomer in the acrylic copolymer, W.sub.total represents an amount (parts by weight) of all monomers constituting the acrylic copolymer, M.sub.OH represents a molecular weight of the hydroxy group-containing monomer, and n represents a hydroxy value of the hydroxy group-containing monomer.

7. The adhesive composition according to claim 6, wherein the value X is 5 or greater and 30 or smaller.

8. The adhesive composition according to claim 1, wherein the acrylic copolymer contains a structural unit derived from at least one monomer selected from the group consisting of tetrahydrofurfuryl (meth)acrylate and isobornyl (meth)acrylate, and an amount of the structural unit derived from at least one monomer selected from the group consisting of tetrahydrofurfuryl (meth)acrylate and isobornyl (meth)acrylate in the acrylic copolymer is 1% by weight or more and 40% by weight or less.

9. The adhesive composition according to claim 1, wherein the acrylic copolymer has a weight average molecular weight of 200,000 or greater and 2,000,000 or smaller.

10. The adhesive composition according to claim 1, further comprising a tackifier resin.

11. The adhesive composition according to claim 10, wherein the tackifier resin is at least one selected from the group consisting of a rosin ester tackifier resin and a terpene tackifier resin.

12. The adhesive composition according to claim 1, which does not contain a surfactant.

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

14. The adhesive tape according to claim 13, wherein the adhesive layer has a gel fraction of 10% by weight or more and 70% by weight or less.

15. The adhesive tape according to claim 13, which has a 180° peeling force for glass of 5 N/25 mm or more as measured in conformity with JIS Z 0237:2009.

16. The adhesive tape according to claim 13, which has a 180° peeling force for a polycarbonate plate of 5 N/25 mm or more as measured in conformity with JIS Z 0237:2009.

17. The adhesive tape according to claim 13, in fixing an electronic device component or an in-vehicle component.

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

19. A method for producing an electronic device component or an in-vehicle component, comprising the method for fixing an electronic device component or an in-vehicle component according to claim 18.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0110] FIG. 1 is a schematic view illustrating a shear holding power test for an adhesive tape.

[0111] FIG. 2 is a schematic view illustrating a repulsion resistance test for an adhesive tape.

DESCRIPTION OF EMBODIMENTS

[0112] 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.

<n-Heptyl Acrylate>

[0113] n-Heptyl alcohol (produced by Tokyo Chemical Industry Co., Ltd.) and acrylic acid (produced by Nippon Shokubai Co., Ltd.) were esterified to prepare n-heptyl acrylate.

<1-Methylhexyl Acrylate>

[0114] 2-Heptyl alcohol (produced by Tokyo Chemical Industry Co., Ltd.) and acrylic acid (produced by Nippon Shokubai Co., Ltd.) were esterified to prepare 1-methylhexyl acrylate.

<Other Acrylic Monomers>

[0115] The following commercial monomers were provided.

[0116] Butyl acrylate (BA) (produced by Mitsubishi Chemical Corporation)

[0117] 2-Ethylhexyl acrylate (2-EHA) (produced by Mitsubishi Chemical Corporation)

[0118] Acrylic acid (AAc) (produced by Nippon Shokubai Co., Ltd.)

[0119] 2-Hydroxyethyl acrylate (2-HEA) (produced by Osaka Organic Chemical Industry Ltd.)

[0120] Tetrahydrofurfuryl acrylate (THFA)

[0121] Isobornyl acrylate (IBOA)

<Cross-Linking Agent>

[0122] A commercial isocyanate cross-linking agent (produced by Tosoh Corporation, Coronate L-45) was provided.

<Tackifier Resin>

[0123] Commercial bio-derived tackifier resins were provided.

[0124] (1) Terpene phenol resin A (produced by Yasuhara Chemical Co., Ltd., G150, softening point: 150° C., bio-derived carbon content 67% by weight)

[0125] (2) Polymerized rosin ester resin B (hydroxy value: 46, softening point: 152° C., bio-derived carbon content 95% by weight)

[0126] (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) Production of Acrylic Copolymer A (Solution Polymerization)

[0127] 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 diluting 0.1 parts by weight of azobisisobutyronitrile as a polymerization initiator 10-fold with ethyl acetate. Then, 96.6 parts by weight of the n-heptyl acrylate, 2.9 parts by weight of the acrylic acid, and 0.5 parts by weight of the 2-hydroxyethyl acrylate were added dropwise over two hours. After completion of dropwise addition, the polymerization initiator solution prepared by diluting 0.1 parts by weight of azobisisobutyronitrile as a polymerization initiator 10-fold with ethyl acetate was added again to the reaction vessel, and the polymerization reaction was allowed to proceed for four hours. Thus, a solution containing an acrylic copolymer A was obtained.

[0128] The obtained acrylic copolymer A was diluted 50-fold with 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 subjected to GPC measurement at a sample flow rate of 1 mL/min and a column temperature of 40° C. to measure the polystyrene equivalent molecular weight of the acrylic copolymer A. Thus, the weight average molecular weight was determined.

(2) Production of Adhesive Tape

[0129] To the obtained solution containing the acrylic copolymer A was added the isocyanate cross-linking agent (produced by Tosoh Corporation, Coronate L-45) such that the amount of the solids of the isocyanate cross-linking agent was 0.2 parts by weight relative to 100 parts by weight of the acrylic copolymer A, whereby an adhesive solution was prepared. The adhesive solution was applied to the release-treated surface of 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 the release-treated surface of a release-treated PET film having a thickness of 75 μm and left to stand at 40° C. for 48 hours, whereby an adhesive tape (non-support type) was obtained.

[0130] 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 23 μm (produced by Futamura Chemical Co., Ltd., FE2002) and cut to a 20 mm×40 mm flat rectangular shape. The release film on 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.

Gel fraction (% by weight)=100×(W.sub.2−W.sub.0)/(W.sub.1−W.sub.0)

(W.sub.0: the weight of the substrate (PET film), W.sub.1: the weight of the specimen before immersion, W.sub.2: the weight of the specimen after immersion and drying)

[0131] The adhesive layer of the obtained adhesive tape was subjected to measurement with a liquid chromatography mass spectrometer (NEXCERA produced by Shimadzu Corporation or Exactive produced by Thermo Fisher Scientific) to determine the surfactant content.

EXAMPLES 2 TO 11 AND 13 TO 37 AND COMPARATIVE EXAMPLES 1 TO 6

[0132] Adhesive tapes were obtained as in Example 1 except that the types and amounts of the acrylic monomers constituting the acrylic copolymer, the weight average molecular weight of the acrylic copolymer, the types and amounts of the tackifier resin and the cross-linking agent were changed as shown in Tables 1 to 4. In Examples 1 and 27 to 37, the value X of each of the obtained acrylic copolymers was calculated using the above equation (1).

[0133] As for the tackifier resins, in Examples 10 and 11, 10 parts by weight of the terpene phenol 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 were used. In Example 14, 2.9 parts by weight of the terpene phenol resin A, 4.2 parts by weight of the polymerized rosin ester resin B, and 2.9 parts by weight of the hydrogenated rosin ester resin C were used. In Example 15, 4.4 parts by weight of the terpene phenol resin A, 6.2 parts by weight of the polymerized rosin ester resin B, and 4.4 parts by weight of the hydrogenated rosin ester resin C were used. In Example 16, 14.7 parts by weight of the terpene phenol resin A, 20.6 parts by weight of the polymerized rosin ester resin B, and 14.7 parts by weight of the hydrogenated rosin ester resin C were used. In Example 17, 17.6 parts by weight of the terpene phenol resin A, 24.8 parts by weight of the polymerized rosin ester resin B, and 17.6 parts by weight of the hydrogenated rosin ester resin C were used.

EXAMPLE 12

(1) Production of Acrylic Copolymer B (Emulsion Polymerization)

[0134] An amount of 100 parts by weight of a mixture of acrylic monomers shown in Table 1 to constitute the acrylic copolymer B was put in a separate container in advance. To the monomer mixture were added 5.8 parts by weight of polyoxyethylene nonyl phenyl ether sodium sulfate (produced by Kao Corp., LEVENOL WZ) and 57 parts by weight of deionized water, followed by stirring, whereby an emulsion of the monomer mixture was prepared.

[0135] Separately, 40 parts by weight of deionized water and 0.2 parts by weight of polyoxyethylene nonyl phenyl ether sodium sulfate were added to a reaction vessel, nitrogen was flowed thereinto, and the inner temperature was increased to 80° C. Thereafter, 4 parts by weight of an aqueous potassium persulfate solution having a concentration of 5% was added to the reaction vessel. The emulsion of the monomer mixture prepared in advance was added dropwise into the reaction vessel over three hours, and concurrently 4 parts by weight of an aqueous potassium persulfate solution having a concentration of 5% was added dropwise, to perform emulsion polymerization at an internal temperature of 80° C. to 83° C. After completion of dropwise addition, the reaction solution was maintained at the same temperature for three hours, and then cooled to room temperature. The reaction solution was adjusted to a pH of 7.5 by adding 25% aqueous ammonia, whereby an emulsified copolymer having an average particle size of 210 nm was obtained.

[0136] To the obtained solution containing the emulsified copolymer were added an alkali-thickening type acrylic thickener (produced by Saiden Chemical Industry Co., Ltd., SAIVINOL AZ-1), 25% aqueous ammonia, and deionized water, whereby an solution containing an acrylic copolymer B was obtained. The solution had a solid concentration of 50%, a viscosity of 3,500 mPas, and a pH of 8.0.

[0137] The weight average molecular weight of the obtained acrylic copolymer B was unable to be measured.

(2) Production of Adhesive Tape

[0138] An adhesive tape was obtained as in Example 1 except that the obtained acrylic copolymer B was used. The gel fraction and the surfactant content were determined as in Example 1.

<Evaluation>

[0139] The adhesive tapes obtained in the examples and comparative examples were evaluated by the following methods. Tables 1 to 4 show the results.

(1) Peeling Force for Smooth Surface

[0140] The 180° peeling force of each of the adhesive tapes for glass as a smooth surface was measured in conformity with JIS Z 0237:2009.

[0141] Specifically, first, one surface (the side not to be measured) of the adhesive tape was backed with a polyethylene terephthalate film having a thickness of 23 μm (produced by Futamura Chemical Co., Ltd., FE2002) and then the adhesive tape was cut to a size of 25 mm wide×75 mm long to prepare a specimen. This specimen was placed on a glass plate (surface roughness Ra=0.2 μm, 2-mm float glass produced by Shenzhen Sun Global Glass) with the adhesive layer (the side to be measured) facing the glass plate. A 2-kg rubber roller was then moved back and forth once on the specimen at a speed of 300 mm/min to bond the specimen and the glass plate together. The specimen was then left to stand at 23° C. and a humidity of 50% for 20 minutes to prepare a test sample. The adhesive tape and the glass of the test sample are peeled apart in the 180° direction at a tensile speed of 300 mm/min under the conditions of 23° C. and a humidity of 50% in conformity with JIS Z 0237:2009 to measure adhesion (N/25 mm).

(2) Peeling Force for Rough Surface

[0142] The 180° peeling force of each of the adhesive tapes for water-proof abrasive paper (produced by Noritake Coated Abrasive Co., Ltd., C947H, grain size 360, surface roughness Ra=10.8 μm) as a rough surface was measured in conformity with JIS Z 0237:2009.

[0143] Specifically, first, the back surface of the water-proof abrasive paper was bonded to a SUS304 plate using an adhesive tape (produced by Sekisui Chemical Co., Ltd., #560). Next, one surface (the side not to be measured) of the adhesive tape was backed with a polyethylene terephthalate film having a thickness of 23 μm (produced by Futamura Chemical Co., Ltd., FE2002) and then the adhesive tape was cut to a size of 25 mm wide×75 mm long to prepare a specimen. This specimen was placed on the abrasive surface of the water-proof abrasive paper bonded to the SUS304 plate, with its adhesive layer (the side to be measured) facing the abrasive surface. A 2-kg rubber roller was then moved back and forth once on the specimen at a speed of 300 mm/min to bond the specimen and the abrasive paper together. The specimen was then left to stand at 23° C. and a humidity of 50% for 20 minutes to prepare a test sample. The adhesive tape and the glass of the test sample are peeled apart in the 180° direction at a tensile speed of 300 mm/min in conformity with JIS Z 0237 to measure adhesion (N/25 mm) at 23° C.

[0144] The surface roughness Ra of the water-proof abrasive paper was measured using a laser microscope (produced by KEYENCE, Color 3D Laser Microscope, VK-8710).

(3) Peeling Force for Polycarbonate Plate (PC Plate)

[0145] The 180° peeling force of each of the adhesive tapes obtained in Examples 1 and 18 to 26 for a polycarbonate plate (PC plate) was measured in conformity with JIS Z 0237:2009.

[0146] Specifically, first, one surface (the side not to be measured) of the adhesive tape was backed with a polyethylene terephthalate film having a thickness of 23 μm (produced by Futamura Chemical Co., Ltd., FE2002) and then the adhesive tape was cut to a size of 25 mm wide×75 mm long to prepare a specimen. This specimen was placed on a PC plate (surface roughness Ra=0.2 μm, produced by C.I. TAKIRON Corporation, PC-1600, thickness 2 mm) with the adhesive layer (the side to be measured) facing the PC plate. A 2-kg rubber roller was then moved back and forth once on the specimen at a speed of 300 mm/min to bond the specimen and the PC plate together. The specimen was then left to stand at 23° C. and a humidity of 50% for 20 minutes to prepare a test sample. The adhesive tape and the glass of the test sample are peeled apart in the 180° direction at a tensile speed of 300 mm/min under the conditions of 23° C. and a humidity of 50% in conformity with JIS Z 0237:2009 to measure adhesion (N/25 mm).

(4) Shear Holding Power Test

[0147] The adhesive tapes obtained in Examples 1 and 27 to 37 were subjected to a shear holding power test.

[0148] FIG. 1 is a schematic view illustrating a shear holding power test for an adhesive tape.

[0149] As illustrated in FIG. 1, a polyethylene terephthalate film 5 having a thickness of 23 μm (produced by Futamura Chemical Co., Ltd., FE2002) and a SUS plate 7 were bonded together using an adhesive tape 6. The bonded area was 25 mm×25 mm. A 1-kg weight 8 was hung from one end of the polyethylene terephthalate film 5, and the specimen was left to stand at a temperature of 80° C. The amount of slippage of the adhesive tape (the distance the adhesive tape slipped) (mm) after one hour was measured.

(5) Repulsion Resistance Test

[0150] The adhesive tapes obtained in Examples 1 and 27 to 37 were subjected to a repulsion resistance test.

[0151] FIG. 2 is a schematic view illustrating a repulsion resistance test for an adhesive tape.

[0152] As illustrated in FIG. 2, an adhesive tape 9 was cut to a flat rectangular shape (25 mm wide×150 mm long) and used to bond an aluminum plate 10 (25 mm wide×150 mm long×0.3 mm thick) and a polycarbonate resin plate 11 (25 mm wide×200 mm long×1 mm thick). The position of the adhesive tape 9 was adjusted such that the adhesive tape 9 was at the center portion of the polycarbonate resin plate 11 in the longitudinal direction. A 2-kg rubber roller was moved back and forth once on the polycarbonate resin plate 11 at a speed of 300 ram/min. Thus, the polycarbonate resin plate 11 and the aluminum plate 10 were integrated together with the adhesive tape 9 therebetween, and left to stand 23° C. for 24 hours to prepare a test sample 12. The test sample 12 was set on a fixture 13 as illustrated in FIG. 2. Bending stress was applied in the vertical direction of the test sample 12 to curve the test sample 12 in an arc shape such that the distance between the two longitudinal edges of the polycarbonate resin plate 11 reached 180 mm. The test sample 12 in this state was put in an 85° C. oven and left to stand for 24 hours. The test sample 12 was taken out from the oven while keeping it curved in an arc shape, and the height H (mm) of the partial detachment between the aluminum plate 10 and the polycarbonate resin plate 11 was measured with a caliper.

TABLE-US-00001 TABLE 1 Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- ple 1 ple 2 ple 3 ple 4 ple 5 ple 6 ple 7 ple 8 ple 9 Adhesive Acrylic n-Heptyl acrylate 96.6 96.6 96.6 96.6 96.6 96.6 48.3 72.5 48.3 layer copolymer BA 0 0 0 0 0 0 48.3 24.1 0 [parts by 2-EHA 0 0 0 0 0 0 0 0 48.3 weight] 1-Methylhexyl 0 0 0 0 0 0 0 0 0 acrylate AAc 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2-HEA 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Tackifier resin (TF) [parts by weight] 0 0 0 0 0 0 0 0 0 Cross-linking agent [parts by weight] 0.2 0.1 0.3 0.3 0.2 0.5 0.2 0.2 0.2 Surfactant [parts by weight] 0 0 0 0 0 0 0 0 0 Mw of acrylic copolymer [×10.sup.4] 100 100 100 51 51 51 107 98 103 Gel fraction of adhesive layer 42 25 61 45 23 68 44 41 39 [% by weight] Evaluation Peeling force for 8.4 8.5 8.2 9.1 9.4 8.8 9.7 8.6 8.3 smooth surface (N/25 mm) Peeling force for 9.7 9.9 9.2 10.1 10.2 9.7 8.9 9.3 9.2 rough surface (N/25 mm) Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- ple 10 ple 11 ple 12 ple 13 ple 14 ple 15 ple 16 ple 17 Adhesive Acrylic n-Heptyl acrylate 96.6 48.3 96.6 29.0 96.6 96.6 96.6 96.6 layer copolymer BA 0 48.3 0 67.6 0 0 0 0 [parts by 2-EHA 0 0 0 0 0 0 0 0 weight] 1-Methylhexyl 0 0 0 0 0 0 0 0 acrylate AAc 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2-HEA 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Tackifier resin (TF) [parts by weight] 34 34 0 0 10 15 50 60 Cross-linking agent [parts by weight] 0.5 0.5 0 0.2 0.3 0.4 0.6 0.7 Surfactant [parts by weight] 0 0 6 0 0 0 0 0 Mw of acrylic copolymer [×10.sup.4] 100 107 — 98 100 100 100 100 Gel fraction of adhesive layer 36 35 45 44 41 44 33 38 [% by weight] Evaluation Peeling force for 15.9 19.7 8.5 9.5 10.8 12.4 17.7 17.8 smooth surface (N/25 mm) Peeling force for 13.8 16.9 8.6 8.8 11.4 12.2 13.1 11.3 rough surface (N/25 mm)

TABLE-US-00002 TABLE 2 Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- ple 1 ple 18 ple 19 ple 20 ple 21 ple 22 ple 23 ple 24 ple 25 ple 26 Adhesive Acrylic n-Heptyl acrylate 96.6 95.6 91.6 86.6 76.6 71.6 66.6 56.6 86.6 66.6 layer copolymer BA 0 0 0 0 0 0 0 0 0 0 [parts by 2-EHA 0 0 0 0 0 0 0 0 0 0 weight] 1-Methylhexyl 0 0 0 0 0 0 0 0 0 0 acrylate THFA 0 1.0 5.0 10.0 20.0 25.0 30.0 40.0 0 0 IBOA 0 0 0 0 0 0 0 0 10.0 30.0 AAc 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2-HEA 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Tackifier resin (TF) [parts by weight] 0 0 0 0 0 0 0 0 0 0 Cross-linking agent [parts by weight] 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Surfactant [parts by weight] 0 0 0 0 0 0 0 0 0 0 Mw of acrylic copolymer [×10.sup.4] 100 100 99 97 96 96 95 93 98 94 Gel fraction of adhesive layer [% by weight] 42 41 38 39 39 37 36 36 39 37 Evaluation Peeling force for 8.4 9.5 11.4 12.5 13.4 13.8 14.1 13.2 12.5 15.1 smooth surface (N/25 mm) Peeling force for 9.7 10.7 11.6 12.6 13.7 13.3 11.9 9.9 13.3 10.9 rough surface (N/25 mm) Peeling force for 7.5 8.9 11.7 13.7 15.3 16.1 16.0 15.1 14.6 16.5 PC plate (N/25 mm)

TABLE-US-00003 TABLE 3 Example Example Example Example Example Example 1 27 28 29 30 31 Adhesive Acrylic n-Heptyl acrylate 96.6 97.09 97.07 97.05 97.04 97.09 layer copolymer BA 0 0 0 0 0 0 [parts by 2-EHA 0 0 0 0 0 0 weight] 1-Methylhexyl 0 0 0 0 0 0 acrylate AAc 2.9 2.9 2.9 2.9 2.9 2.9 2-HEA 0.5 0.01 0.03 0.05 0.06 0.01 Tackifier resin (TF) [parts by weight] 0 0 0 0 0 0 Cross-linking agent [parts by weight] 0.2 0.2 0.2 0.2 0.2 1.0 Surfactant [parts by weight] 0 0 0 0 0 0 Mw of acrylic copolymer [×10.sup.4] 100 102 94 105 101 102 Value X 43.1 0.9 2.4 4.5 5.2 0.9 Gel fraction of adhesive layer 42 0 5 10 13 0 [% by weight] Evaluation Peeling force for 8.4 9.7 9.5 9.3 9.4 9.7 smooth surface (N/25 mm) Peeling force for 9.7 10.7 10.5 10.4 10.3 10.6 rough surface (N/25 mm) Amount of slippage 0.3 Fell 3.1 1.4 0.9 Fell in shear holding power test (mm) Partial detatchment 3 13 0 0 0 11 height in repulsion resistance test (mm) Example Example Example Example Example Example 32 33 34 35 36 37 Adhesive Acrylic n-Heptyl acrylate 97.0 96.8 96.5 96.3 96.5 96.6 layer copolymer BA 0 0 0 0 0 0 [parts by 2-EHA 0 0 0 0 0 0 weight] 1-Methylhexyl 0 0 0 0 0 0 acrylate AAc 2.9 2.9 2.9 2.9 2.9 2.9 2-HEA 0.1 0.3 0.6 0.8 0.6 0.5 Tackifier resin (TF) [parts by weight] 0 0 0 0 0 0 Cross-linking agent [parts by weight] 0.2 0.2 0.2 0.2 0.1 0.2 Surfactant [parts by weight] 0 0 0 0 0 0 Mw of acrylic copolymer [×10.sup.4] 103 104 96 99 96 119 Value X 8.9 26.9 49.6 68.2 49.6 51.2 Gel fraction of adhesive layer 21 33 48 65 35 53 [% by weight] Evaluation Peeling force for 9.0 8.8 8.7 8.6 8.7 8.7 smooth surface (N/25 mm) Peeling force for 10.3 9.8 9.3 9.0 9.8 9.2 rough surface (N/25 mm) Amount of slippage 0.5 0.4 0.2 0.1 0.4 0.2 in shear holding power test (mm) Partial detatchment 0 0 5 15 4 12 height in repulsion resistance test (mm)

TABLE-US-00004 TABLE 4 Comparative Comparative Comparative Comparative Comparative Comparative Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Adhesive Acrylic n-Heptyl acrylate 0 0 0 0 0 0 layer copolymer BA 97.0 97.0 48.3 48.3 0 0 [parts by 2-EHA 0 0 48.3 48.3 96.6 0 weight] 1-Methylhexyl 0 0 0 0 0 96.6 acrylate AAc 2.9 2.9 2.9 2.9 2.9 2.9 2-HEA 0.1 0.1 0.5 0.5 0.5 0.5 Tackifier resin (TF) [parts by weight] 0 0 0 0 0 0 Cross-linking agent [parts by weight] 0.5 1.0 0.3 0.2 0.3 0.3 Surfactant [parts by weight] 0 0 0 0 0 0 Mw of acrylic copolymer [×10.sup.4] 55 112 53 91 66 62 Gel fraction of adhesive layer [% by weight] 47 72 50 46 54 51 Evaluation Peeling force for 9.7 8.3 8.7 8.4 8.7 9.3 smooth surface (N/25 mm) Peeling force for 7.9 7.7 8.1 7.8 8.4 7.5 rough surface (N/25 mm)

INDUSTRIAL APPLICABILITY

[0153] The present invention can provide an adhesive composition that can exhibit excellent adhesion to both smooth surfaces and rough surfaces. The present invention can also provide an adhesive tape including an adhesive layer containing the adhesive composition, as well as a method for fixing and a method for producing an electronic device component or an in-vehicle component using the adhesive tape.

REFERENCE SIGNS LIST

[0154] 5 polyethylene terephthalate film [0155] 6 adhesive tape [0156] 7 SUS plate [0157] 8 weight (1 kg) [0158] 9 adhesive tape [0159] 10 aluminum plate [0160] 11 polycarbonate resin plate [0161] 12 test sample [0162] 13 fixture