HOT-MELT COMPOSITION

Abstract

A hot-melt composition has excellent workability, hot flow resistance, balance between adhesion and detachability, volatility resistance, and hot creep resistance. The hot-melt composition includes: as thermoplastic elastomers, a styrene-based thermoplastic elastomer having a weight average molecular weight of 300,000 or more, a styrene-based thermoplastic elastomer having a styrene content of no greater than 20% by mass, and an olefin-based thermoplastic elastomer including an ethylene propylene rubber and/or butyl rubber; as tackifiers, an aromatic petroleum resin, a terpene phenol resin, and an amorphous polyalphaolefin; a high molecular weight paraffin oil having a weight average molecular weight of 1,000 or more; and a low molecular weight paraffin oil having a weight average molecular weight of less than 1,000.

Claims

1. A hot-melt composition comprising: as thermoplastic elastomers, a styrene-based thermoplastic elastomer having a weight average molecular weight of 300,000 or more, a styrene-based thermoplastic elastomer having a styrene content of no greater than 20% by mass, and an olefin-based thermoplastic elastomer including an ethylene propylene rubber and/or butyl rubber; as tackifiers, an aromatic petroleum resin, a terpene phenol resin, and an amorphous polyalphaolefin; a high molecular weight paraffin oil having a weight average molecular weight of 1,000 or more; and a low molecular weight paraffin oil having a weight average molecular weight of less than 1,000.

2. The hot-melt composition according to claim 1, wherein the content of the styrene-based thermoplastic elastomer is 10 to 50 parts by mass, with respect to 100 parts by mass of the styrene-based thermoplastic elastomer.

3. The hot-melt composition according to claim 1, wherein the content of the olefin-based thermoplastic elastomer is 30 to 70 parts by mass, with respect to 100 parts by mass of the styrene-based thermoplastic elastomer.

4. The hot-melt composition according to claim 1, wherein the styrene-based thermoplastic elastomer includes SEEPS.

5. The hot-melt composition according to claim 1, wherein the total content of the aromatic petroleum resin and the terpene phenol resin is 200 to 600 parts by mass, with respect to 100 parts by mass of the styrene-based thermoplastic elastomer elastomer.

6. The hot-melt composition according to claim 1 wherein the use is for automobile lamps.

Description

EXAMPLES

[0182] The present invention is described below in

[0183] specific terms by setting forth examples. However, the present invention is not limited to these.

[0184] <Production of the Composition>

[0185] The thermoplastic elastomers and paraffin oils shown in Table 1 below were used in the amounts (parts by mass) shown in the same table, these being charged into a 3L double to arm kneader (made by Nihon Spindle Manufacturing Co., Ltd.), and stirred for 40 minutes under conditions of 200 C., to obtain mixtures. Next, compounds corresponding to the tackifiers (2) shown in the same table (or a (comparative) polyterpene resin) and an antiaging agent were added to the mixtures, and these were further mixed for 1 hour to produce hot-melt compositions.

[0186] Note that the styrene content of the styrene-based thermoplastic elastomer in Table 1 is indicated as St xx %, wherein the % means % by mass.

[0187] <Evaluations>

[0188] The following evaluations were performed using the compositions produced as described above. The results are shown in Table 1.

[0189] (Workability)

[0190] After melting the compositions produced as described above under conditions of 220 C. for 30 minutes, the viscosities of the compositions were measured and evaluated according to JIS K 6833-1 using a BF type viscometer (Brookfield type viscometer), rotated using a No. 29 rotor at 5 rpm.

[0191] Evaluation Criteria for Workability

[0192] When the viscosity was 100 Pa.Math.s or less, the workability was evaluated to be very good, which was indicated by .

[0193] When the viscosity was more than 100 Pa.Math.s and no greater than 150 Pa.Math.s, the workability was evaluated to be somewhat good, which was indicated by .

[0194] Meanwhile, when the viscosity exceeded 150 Pa.Math.s, workability was evaluated as poor, which was indicated by X.

[0195] (Hot Flow Resistance: Vertical Flow)

[0196] The compositions produced as described above were melted with a hand gun under conditions of 220 C., and a bead of 4 mm (diameter)50 mm in (length) was applied onto an aluminum plate. Then, the aluminum plate was paced in a 120 C. oven, standing at 90, for 24 hours and the degree of sagging of the material (composition) after 24 hours (after 24 hours, with the aluminum plate standing at 90, the distance to which the bead sags from the lowest point of adhesion between the aluminum plate and the bead, at the lower surfaces of the plate and the bead attached thereto) was measured.

[0197] Evaluation Criteria for Hot Flow Resistance

[0198] When the sagging distance was 5 mm or less, the hot flow resistance was evaluated as good, which was indicated by .

[0199] Meanwhile, when the sagging distance exceeded 5 mm, the hot flow resistance was evaluated as poor, which was indicated by X.

[0200] (Adhesion/Detachability)

[0201] Each composition produced as described above was heated to 220 C., melted, and applied to a PP sheet (made of polypropylene, 25 mm long75 mm wide3 mm thick). After application, a PC sheet (made of polycarbonate, 25 mm long75 mm wide3 mm thick) was overlaid on the composition on the PP sheet so as to form a cross, and clamped so that the composition reached a thickness of 3 mm with an adhesion area of 25 mm25 mm, and this was left for 24 hours under conditions of 20 C. and 50% RH to cure (solidify), so as to obtain a test piece. The test piece has a hot-melt composition (adhesive layer) between the PP sheet and the PC sheet.

[0202] Using a tensile tester, the resulting test piece was subjected to a tensile test in which the PC sheet was pulled in the direction perpendicular to the surface of the PP sheet, under conditions of 20 C. and a pulling speed of 50 mm/min, to measure the peel strength of the test piece. In addition, the condition of the failure surface (failure mode) after failure was visually observed.

[0203] The results for each test piece are shown in Table 1 with the measured peel strength as strength (N). In terms of the failure mode, indicates that the adhesive layer was cleanly peeled off from the PP sheet, and X indicates that adhesive layer remained on the PP sheet.

[0204] Evaluation of the Balance Between Adhesion and Detachability

[0205] When the strength (peel strength) was 60 to 130 N and the failure mode was , the balance between adhesion and detachability was evaluated as good.

[0206] Furthermore, when the strength was 70 to 120 N and the failure mode was , the balance between adhesion and detachability was evaluated as better, when the strength was 75 to 90 N and the failure mode was , the balance between adhesion and detachability was evaluated as even better.

[0207] On the other hand, when the strength was less than 60 N, the adhesion was poor, and therefore the balance between the adhesiveness and detachability was evaluated as poor.

[0208] Furthermore, when the strength exceeded 130 N, or when the failure mode was X, the detachability was poor, and therefore the balance between adhesion and detachability was evaluated as poor.

[0209] (Volatility Resistance)

[0210] 3 g of each composition prepared as described above was placed in a test tube and the top of the test tube was sealed with a glass plate. The test tube was immersed in a 120 C. oil bath and heated.

[0211] 24 hours after the start of heating, a visual check was made as to whether or not there was staining on the inner surface of the glass plate (the part forming the sealed space with the test tube).

[0212] If the inner surface of the glass plate was not stained, this was indicated as unstained and the volatility resistance was evaluated as good.

[0213] On the other hand, if a stain was found on the inner surface of the glass plate, this was indicated as stained and the volatility resistance was evaluated as good.

[0214] (Hot Creep Resistance)

[0215] Each composition produced as described above was heated to 220 C., melted, and applied to a PP sheet (made of polypropylene, 25 mm long75 mm wide3 mm thick). After application, a PC sheet (made of polycarbonate, 25 mm long75 mm wide3 mm thick) was overlaid on the composition on the PP sheet so as to form a cross, and clamped so that the composition reached a thickness of 3 mm with an adhesion area of 25 mm25 mm, and this was left for 24 hours under conditions of 20 C. and 50% RH to cure, so as to obtain a test piece. The test piece has a hot-melt composition (adhesive layer) between the PP sheet and the PC sheet.

[0216] The initial test pieces obtained were subjected to a heat resistance test in which the PC sheet was pulled in the direction perpendicular to the surface of the PP sheet, each of the test pieces was fixed in a state where the adhesive layer was stretched by 150%, and these were left in that state for 24 hours under conditions of 60 C.

[0217] The degree of peeling of the hot-melt composition (adhesive layer) in the test piece after the heat resistance test (with the fixed state maintained; same hereinafter) was visually checked.

[0218] Evaluation Criteria for Hot Creep Resistance

[0219] In the test piece after the heat resistance test, if the hot-melt composition (adhesive layer) was not completely peeled off from the substrate, or if the area of the portion where the hot-melt composition was bonded to the PP sheet and the PC sheet was 80% or more of the entire bonding surface (25 mm long25 mm wide; same hereinafter), this was evaluated as the best hot creep resistance (highest adhesion retention rate after heating), which was indicated by .

[0220] When the area of the portion where the hot-melt composition adheres to the PP sheet and PC sheet was 60% or more but less than 80% of the entire adhesion surface, the hot creep resistance was evaluated as very good (very high adhesion retention rate after heating), which was indicated by .

[0221] When the area of the portion where the hot-melt composition adheres to the PP sheet and the PC sheet was 30% or more but less than 60% of the entire adhesion surface, the hot creep resistance was evaluated as somewhat good (somewhat high adhesion retention rate after heating), which was indicated by .

[0222] On the other hand, when the area of portion where the hot-melt composition adheres to the PP sheet and the PC sheet was less than 30% of the entire adhesion surface, the hot creep resistance was evaluated as poor (low adhesion retention rate after heating), which was indicated by X.

TABLE-US-00001 TABLE 1 Example 1 Example 2 Example 3 Example 4 Example 5 styrene-based thermoplastic elastomer (1a-1) 100 100 100 100 100 SEEPS (St 30%, Mw 390,000) comparative styrene-based thermoplastic elastomer 1 SEEPS (St 30%, Mw 260,000) comparative styrene-based thermoplastic elastomer 2 SEBS (St 30%, Mw 110,000) styrene-based thermoplastic elastomer 25 10 50 25 25 (1b-1) SEPS (St 13%, Mw 120,000) styrene-based thermoplastic elastomer (1b-2) SEBS (St 12%, Mw 180,000) comparative styrene-based thermoplastic elastomer 3 SEPS (St 65%, Mw 90,000) olefin-based thermoplastic elastomer 50 50 50 30 70 (1c-1) EPT rubber olefin-based thermoplastic elastomer (1c-2) butyl rubber aromatic petroleum resin (2a-1) 200 200 200 200 200 terpene phenol resin (2b-1) 150 150 150 150 150 (comparative) polyserpene resin amorphous polyalphaolefin (2c-1) APAO 3 3 3 3 3 (propylene/butene) amorphous polyalphaolefin (2c-2) APAO (propylene/ethylene) high molecular weight paraffin oil (3a-1) 400 400 400 400 400 low molecular weight paraffin oil (3b-1) 600 600 600 600 600 antiaging agent 5 5 5 5 5 worability: Pa .Math. s@220 C. hot flow resistance (vertical flow 120 C. 24 hr) adhesion/datachability strength [N] 80 115 60 103 70 failure mode volatility resistance: 120 C. 24 hr unmarked unmarked unmarked unmarked unmarked hot creep resistance: 150% elongation, 60 C. 24 hours Example 6 Example 7 Example 8 Example 9 Example 10 styrene-based thermoplastic elastomer (1a-1) 100 100 100 100 100 SEEPS (St 30%, Mw 390,000) comparative styrene-based thermoplastic elastomer 1 SEEPS (St 30%, Mw 260,000) comparative styrene-based thermoplastic elastomer 2 SEBS (St 30%, Mw 110,000) styrene-based thermoplastic elastomer 25 25 25 25 (1b-1) SEPS (St 13%, Mw 120,000) styrene-based thermoplastic elastomer 25 (1b-2) SEBS (St 12%, Mw 180,000) comparative styrene-based thermoplastic elastomer 3 SEPS (St 65%, Mw 90,000) olefin-based thermoplastic elastomer 50 50 50 50 50 (1c-1) EPT rubber olefin-based thermoplastic elastomer (1c-2) butyl rubber aromatic petroleum resin (2a-1) 250 150 200 200 200 terpene phenol resin (2b-1) 200 100 150 150 150 (comparative) polyserpene resin amorphous polyalphaolefin (2c-1) APAO 3 3 3 9 3 (propylene/butene) amorphous polyalphaolefin (2c-2) APAO (propylene/ethylene) high molecular weight paraffin oil (3a-1) 400 400 200 400 400 low molecular weight paraffin oil (3b-1) 600 600 800 600 600 antiaging agent 5 5 5 5 5 worability: Pa .Math. s@220 C. hot flow resistance (vertical flow 120 C. 24 hr) adhesion/datachability strength [N] 129 126 68 95 77 failure mode volatility resistance: 120 C. 24 hr unmarked unmarked unmarked unmarked unmarked hot creep resistance: 150% elongation, 60 C. 24 hours Example 11 Example 12 Example 13 Example 14 styrene-based thermoplastic elastomer (1a-1) 100 100 100 100 SEEPS (St 30%, Mw 390,000) comparative styrene-based thermoplastic elastomer 1 SEEPS (St 30%, Mw 260,000) comparative styrene-based thermoplastic elastomer 2 SEBS (St 30%, Mw 110,000) styrene-based thermoplastic elastomer 25 25 25 25 (1b-1) SEPS (St 13%, Mw 120,000) styrene-based thermoplastic elastomer (1b-2) SEBS (St 12%, Mw 180,000) comparative styrene-based thermoplastic elastomer 3 SEPS (St 65%, Mw 90,000) olefin-based thermoplastic elastomer 50 50 50 (1c-1) EPT rubber olefin-based thermoplastic elastomer 50 (1c-2) butyl rubber aromatic petroleum resin (2a-1) 200 200 200 100 terpene phenol resin (2b-1) 150 150 150 100 (comparative) polyserpene resin amorphous polyalphaolefin (2c-1) APAO 3 3 3 (propylene/butene) amorphous polyalphaolefin (2c-2) APAO 3 (propylene/ethylene) high molecular weight paraffin oil (3a-1) 400 400 600 400 low molecular weight paraffin oil (3b-1) 600 600 400 600 antiaging agent 5 5 5 5 worability: Pa .Math. s@220 C. hot flow resistance (vertical flow 120 C. 24 hr) adhesion/datachability strength [N] 61 84 78 65 failure mode volatility resistance: 120 C. 24 hr unmarked unmarked unmarked unmarked hot creep resistance: 150% elongation, 60 C. 24 hours Comparative Comparative Comparative Comparative Example 1 Example 2 Example 3 Example 4 styrene-based thermoplastic elastomer 100 100 100 (1a-1) SEEPS (St 30%, Mw 390,000) comparative styrene-based thermoplastic 100 elastomer 1 SEEPS (St 30%, Mw 260,000) comparative styrene-based thermoplastic elastomer 2 SEBS (St 30%, Mw 110,000) styrene-based thermoplastic elastomer 25 25 (1b-1) SEPS (St 13%, Mw 120,000) styrene-based thermoplastic elastomer (1b-2) SEBS (St 12%, Mw 180,000) comparative styrene-based thermoplastic 25 elastomer 3 SEPS (St 65%, Mw 90,000) olefin based thermoplastic elastomer 50 50 50 (1c-1) EPT rubber olefin based thermoplastic elastomer (1c-2) butyl rubber aromatic petroleum resin (2a-1) 200 200 200 200 terpene phenol resin (2b-1) 150 150 150 150 (comparative) polyterpene resin amorphous polyalphaolefin (2c-1) APAO 3 3 3 3 (propylene/butene) amorphous polyalphaolefin (2c-2) APAO (propylene/ethylene) high molecular weight paraffin oil (3a-1) 400 400 400 400 low molecular weight paraffin oil (3b-1) 600 600 600 600 antiaging agent 5 5 5 5 workability: Pa .Math. s@220 C. X X hot flow resistance (vertical flow X X 120 C. 24 hr) adhesion/detachability strength [N] 33 57 250 101 failure mode volatility resistance: 120 C. 24 hr unmarked unmarked unmarked unmarked hot creep resistance: 150% elongation, X 60 C. 24 hours Comparative Comparative Comparative Comparative Example 5 Example 6 Example 7 Example 8 styrene-based thermoplastic elastomer 100 100 100 100 (1a-1) SEEPS (St 30%, Mw 390,000) comparative styrene-based thermoplastic elastomer 1 SEEPS (St 30%, Mw 260,000) comparative styrene-based thermoplastic elastomer 2 SEBS (St 30%, Mw 110,000) styrene-based thermoplastic elastomer 25 25 25 (1b-1) SEPS (St 13%, Mw 120,000) styrene-based thermoplastic elastomer (1b-2) SEBS (St 12%, Mw 180,000) comparative styrene-based thermoplastic elastomer 3 SEPS (St 65%, Mw 90,000) olefin based thermoplastic elastomer 50 50 50 50 (1c-1) EPT rubber olefin based thermoplastic elastomer (1c-2) butyl rubber aromatic petroleum resin (2a-1) 350 200 200 terpene phenol resin (2b-1) 350 150 (comparative) polyterpene resin 150 amorphous polyalphaolefin (2c-1) APAO 3 3 3 (propylene/butene) amorphous polyalphaolefin (2c-2) APAO (propylene/ethylene) high molecular weight paraffin oil (3a-1) 400 400 400 400 low molecular weight paraffin oil (3b-1) 600 600 600 600 antiaging agent 5 5 5 5 workability: Pa .Math. s@220 C. X X hot flow resistance (vertical flow 120 C. 24 hr) adhesion/detachability strength [N] 39 180 33 41 failure mode X volatility resistance: 120 C. 24 hr unmarked unmarked unmarked unmarked hot creep resistance: 150% elongation, 60 C. 24 hours Comparative Comparative Comparative Comparative Example 9 Example 10 Example 11 Example 12 styrene-based thermoplastic elastomer 100 100 100 100 (1a-1) SEEPS (St 30%, Mw 390,000) comparative styrene-based thermoplastic elastomer 1 SEEPS (St 30%, Mw 260,000) comparative styrene-based thermoplastic elastomer 2 SEBS (St 30%, Mw 110,000) styrene-based thermoplastic elastomer 25 (1b-1) SEPS (St 13%, Mw 120,000) styrene-based thermoplastic elastomer (1b-2) SEBS (St 12%, Mw 180,000) comparative styrene-based thermoplastic elastomer 3 SEPS (St 65%, Mw 90,000) olefin based thermoplastic elastomer 50 (1c-1) EPT rubber olefin based thermoplastic elastomer (1c-2) butyl rubber aromatic petroleum resin (2a-1) 200 350 200 200 terpene phenol resin (2b-1) 150 (comparative) polyterpene resin 150 150 amorphous polyalphaolefin (2c-1) APAO 3 3 3 (propylene/butene) amorphous polyalphaolefin (2c-2) APAO (propylene/ethylene) high molecular weight paraffin oil (3a-1) 400 400 400 low molecular weight paraffin oil (3b-1) 1000 600 600 500 antiaging agent 5 5 5 5 workability: Pa .Math. s@220 C. X X hot flow resistance (vertical flow X 120 C. 24 hr) adhesion/detachability strength [N] 81 63 45 49 failure mode volatility resistance: 120 C. 24 hr marked unmarked unmarked unmarked hot creep resistance: 150% elongation, X X X 60 C. 24 hours Comparative Comparative Comparative Comparative Example 13 Example 14 Example 15 Example 16 styrene-based thermoplastic elastomer 100 100 100 (1a-1) SEEPS (St 30%, Mw 390,000) comparative styrene-based thermoplastic elastomer 1 SEEPS (St 30%, Mw 260,000) comparative styrene-based thermoplastic 100 25 elastomer 2 SEBS (St 30%, Mw 110,000) styrene-based thermoplastic elastomer (1b-1) SEPS (St 13%, Mw 120,000) styrene-based thermoplastic elastomer (1b-2) SEBS (St 12%, Mw 180,000) comparative styrene-based thermoplastic elastomer 3 SEPS (St 65%, Mw 90,000) olefin based thermoplastic elastomer 60 50 (1c-1) EPT rubber olefin based thermoplastic elastomer 100 (1c-2) butyl rubber aromatic petroleum resin (2a-1) 200 350 250 200 terpene phenol resin (2b-1) 150 90 150 (comparative) polyterpene resin amorphous polyalphaolefin (2c-1) APAO 3 3 (propylene/butene) amorphous polyalphaolefin (2c-2) APAO (propylene/ethylene) high molecular weight paraffin oil (3a-1) 400 1000 150 400 low molecular weight paraffin oil (3b-1) 600 600 antiaging agent 5 5 5 5 workability: Pa .Math. s@220 C. X hot flow resistance (vertical flow X 120 C. 24 hr) adhesion/detachability strength [N] 63 90 210 67 failure mode X volatility resistance: 120 C. 24 hr unmarked unmarked unmarked unmarked hot creep resistance: 150% elongation, X X 60 C. 24 hours indicates data missing or illegible when filed

[0223] The details for each component shown in Table 1 are as follows.

[0224] <Styrene-Based Thermoplastic Elastomer (1a)> [0225] Styrene-based thermoplastic elastomer (1a-1): SEEPS (St content: 30% by mass, Mw: 390,000). Product name: Septon 4077, made by Kuraray Co., Ltd. [0226] Comparative styrene-based thermoplastic elastomer 1: SEEPS (St content: 30% by mass, Mw:

[0227] 250,000). Product name Septon 4055, made by Kuraray Co., Ltd. [0228] Comparative styrene-based thermoplastic elastomer 2: SEBS (St content: 30% by mass: Mw 110,000). Product name: Kraton G1650, made by Kuraray Co., Ltd.

[0229] <Styrene-Based Thermoplastic Elastomer (1b)> [0230] Styrene-based thermoplastic elastomer (1b-1): SEPS (St content: 13% by mass, Mw: 120,000). Product name: Septon 2063, made by Kuraray. [0231] Styrene-based thermoplastic elastomer (1b-2): SEBS (St content: 12% by mass, Mw: 180,000). Product name: Tuftec H-1221, made by Asahi Kasei Corp. [0232] Comparative styrene-based thermoplastic elastomer 3: SEPS (St content 65% by mass, Mw 90,000). product name Septon 2104, made by Kuraray Co., Ltd.

[0233] Note that, none of the comparative styrene-based thermoplastic elastomers 1 to 3 corresponds to the styrene-based thermoplastic elastomer (1a) or the styrene-based thermoplastic elastomer (1b) in the present invention.

[0234] <Olefin-Based Thermoplastic Elastomer (1c)> [0235] Olefin-based thermoplastic elastomer (1c-1): ethylene propylene rubber. product name Mitsui EPT0045, made by Mitsui Chemicals. No third component (as monomer). Mw 350,000. Rubber formed only from ethylene and propylene [0236] Olefin-based thermoplastic elastomer (1c-2): butyl rubber. product name Butyl 365, made by JSR. Mw 440,000

[0237] Tackifier (2)

[0238] <Aromatic Petroleum Resin (2a)> [0239] Aromatic petroleum resin (2a-1): aromatic hydrocarbon-based resin (styrene-based hydrocarbon resin). product name FMR0150, made by Mitsui Chemicals.

[0240] <Terpene Phenol Resin (2b)> [0241] Terpene phenol resin (2b-1): product name YS Polyster U115, made by Yasuhara Chemical Co., Ltd. A non to hydrogenated terpene phenol-based resin. [0242] (Comparative) Polyterpene resin: terpene monomer homopolymer (100%) resin. Product name YS Resin PX1150, made by Yasuhara Chemical Co., Ltd.

[0243] <Amorphous Polyalphaolefin (2c)> [0244] Amorphous polyalphaolefin (2c-1): APAO (propylene/butene-1 copolymer). product name RT2780, made by Rextac. Mw 70,000 [0245] Amorphous polyalphaolefin (2c-2): APAO (propylene/ethylene copolymer). product name RT2585, made by Rextac. Mw 60,000

[0246] <High Molecular Weight Paraffin Oil (3a)> [0247] High molecular weight paraffin oil (3a-1): high molecular weight paraffin oil. Weight average molecular weight 1500. Product name: PW-380, made by Idemitsu Kosan Co., Ltd.

[0248] <Low Molecular Weight Paraffin Oil (3b)> [0249] Low molecular weight paraffin oil (3b-1): Low molecular weight paraffin oil. Weight average molecular weight 900. Product name: PW-90, made by Idemitsu Kosan Co., Ltd.

[0250] (Antiaging Agent) [0251] Antiaging agent: hindered phenol-based compound. product name Irganox 1010, made by BASF.

[0252] As is clear from the results shown in Table 1, Comparative Example 1, which did not comprise the specific St-based elastomer (1a) and instead comprised the comparative styrene-based thermoplastic elastomer 1, had poor hot flow resistance.

[0253] Comparative Example 2, which did not comprise the specific St-based elastomer (1b), had poor workability and poor adhesion, and therefore poor balance between adhesion and detachability.

[0254] Comparative Example 3, which did not comprise the specific St-based elastomer (1b), and instead comprised the comparative styrene-based thermoplastic elastomer 3, had poor hot flow resistance and poor detachability, and therefore poor balance between adhesion and detachability.

[0255] Comparative Example 4, which did not comprise the specific olefin-based elastomer (1c), had good balance between adhesion and detachability but had poor workability and hot creep resistance.

[0256] Comparative Example 5, which did not comprise the aromatic petroleum resin (2a), had poor adhesion and detachability, and therefore poor balance between adhesion and detachability.

[0257] Comparative Example 6, which did not comprise the terpene phenol resin (2b), had poor workability and detachability, and therefore poor balance between adhesion and detachability.

[0258] Comparative Example 7, which did not comprise a terpene phenol-based resin (2b), and instead comprised a polyterpene resin, had poor workability and poor adhesion, and therefore poor balance between adhesion and detachability.

[0259] Comparative Example 8, which did not comprise the amorphous polyalphaolefin (2c), had poor adhesion and poor balance between adhesion and detachability.

[0260] Comparative Example 9 which did not comprise high molecular weight paraffin oil (3a) had poor hot flow resistance and volatility resistance.

[0261] Comparative Example 10, which did not comprise the specific St-based elastomer (1b), the specific olefin- based elastomer (1c), or the terpene phenol resin (2b), had poor hot creep resistance.

[0262] Comparative Example 11 which did not comprise the specific St-based elastomer (1b), the specific olefin-based elastomer (1c), the terpene phenol resin (2b), or the amorphous polyalphaolefin (2c), and comprised a polyterpene resin instead of the terpene phenol resin (2b), had poor workability and poor adhesion, and therefore poor balance between adhesion and detachability, and poor hot creep resistance.

[0263] Comparative Example 12 which did not comprise the specific St-based elastomer (1b), the specific olefin-based elastomer (1c) or the terpene phenol-based resin (2b), and comprised a polyterpene resin instead of the terpene phenol resin (2b), had poor workability and poor adhesion, and therefore poor balance between adhesion and detachability, and poor hot creep resistance.

[0264] Comparative Example 13, which did not comprise the specific St-based elastomer (1b) or the specific olefin-based elastomer (1c), had poor workability and hot creep resistance.

[0265] Comparative Example 14, which did not comprise the specific olefin-based elastomer (1c), the terpene phenol-based resin (2b), the amorphous polyalphaolefin (2c), or the low molecular weight paraffin oil (3b), had poor hot creep resistance.

[0266] Comparative Example 15, which did not comprise the specific St-based elastomer (1a), and instead comprised the comparative styrene-based thermoplastic elastomer 2, and which did not comprise the specific St-based elastomer (1b), the amorphous polyalphaolefin (2c), or the low molecular weight paraffin oil (3b), had excessively strong adhesion and could not be detached, and as such the balance between adhesion and detachability was poor.

[0267] Comparative Example 16, which did not comprise the specific St-based elastomer (1b), and instead comprised the comparative styrene-based thermoplastic elastomer 2 had poor hot flow resistance.

[0268] In contrast, the composition of the present invention had good workability, hot flow resistance, balance between adhesion and detachability, volatility resistance, and hot creep resistance.