Thermoplastic elastomer composition
View Patent ↗In order to improve fatigue durability of a thermoplastic elastomer composition composed of a matrix phase of a thermoplastic resin and dispersed phases of a rubber, the thermoplastic elastomer composition comprises (A) 100 parts by weight of a halogenated poly(isoolefin-co-p-alkylstyrene) rubber, (B) 40 to 120 parts by weight of a polyamide resin, and (C) 0.5 to 10 parts by weight of an amine having at least one hydroxyl group. The amine (C) having at least one hydroxyl group is preferably a compound represented by formula (1): where R 1 is a C 1-30 alkyl; R 2 is —(C 2 H 4 O) n —H, where n is an integer of 1 to 30; and R 3 is —(C 2 H 4 O) m —H, where m is an integer of 1 to 30, a C 1-30 alkyl, or hydrogen.
1. A thermoplastic elastomer composition comprising (A) 100 parts by weight of a halogenated poly(isoolefin-co-p-alkylstyrene) rubber, (B) 40 to 120 parts by weight of a polyamide resin, and (C) 0.5 to 10 parts by weight of an amine having at least one hydroxyl group, wherein the amine (C) having at least one hydroxyl group is a compound represented by formula (1):
where R 1 is a C 1-30 alkyl; R 2 is —(C 2 H 4 O) n —H, where n is an integer of 1 to 30; and R 3 is —(C 2 H 4 O) m —H, where in is an integer of 1 to 30, a C 1-30 alkyl, or hydrogen.
2. A thermoplastic elastomer composition according to claim 1 , wherein R 1 is a C 1-30 alkyl; R 2 is —(C 2 H 4 O) n —H, where n is an integer of 1 to 30; and R 3 is —(C 2 H 4 O) m —H, where m is an integer of 1 to 30, or a C 1-30 alkyl.
3. A thermoplastic elastomer composition according to claim 2 , wherein R 1 is a C 1-30 alkyl; R 2 is —(C 2 H 4 O) n —H, where n is an integer of 1 to 30; and R 3 is —(C 2 H 4 O) m —H, where m is an integer of 1 to 30.
4. A thermoplastic elastomer composition according to claim 1 , wherein the total number of oxyethylene repeating unit (C 2 H 4 O) in one molecule of the amine (C) having at least one hydroxyl group is 1 to 30.
5. A thermoplastic elastomer composition according to claim 1 , wherein the alkyl has 8 to 30 carbon atoms.
6. A thermoplastic elastomer composition according to claim 1 , wherein the halogenated poly(isoolefin-co-p-alkylstyrene) rubber (A) is a brominated poly(isobutylene-co-p-methylstyrene) rubber.
7. A thermoplastic elastomer composition according to claim 1 , wherein the halogenated poly(isoolefin-co-p-alkylstyrene) rubber has been dynamically vulcanized.
8. A thermoplastic elastomer composition according to claim 1 , wherein the polyamide resin (B) is at least one selected from the group consisting of nylon 6, nylon 66, nylon 46, nylon 11, nylon 12, nylon 69, nylon 610, nylon 612, nylon 6/66, nylon 6/66/12, nylon 6/66/610, nylon MXD6, nylon 6T, nylon 6/6T, nylon 9T, and aromatic nylon.
9. A thermoplastic elastomer composition according to claim 1 , further comprising 5 to 100 parts by weight of an acid-modified polymer, based on 100 parts by weight of the halogenated poly(isoolefin-co-p-alkylstyrene) rubber (A).
10. A thermoplastic elastomer composition according to claim 9 , wherein the acid-modified polymer is at least one selected from the group consisting of an acid-modified olefin copolymer, an acid-modified styrene-olefin copolymer, an acid-modified ethylene-unsaturated carboxylic acid copolymer, and an acid-modified ethylene-unsaturated carboxylate copolymer.
11. A pneumatic tire comprising an inner liner comprising a thermoplastic elastomer composition according to claim 5 .
12. A pneumatic tire comprising an inner liner comprising a thermoplastic elastomer composition according to claim 6 .
13. A pneumatic tire comprising an inner liner comprising a thermoplastic elastomer composition according to claim 7 .
14. A pneumatic tire comprising an inner liner comprising a thermoplastic elastomer composition according to claim 1 .
15. A pneumatic tire comprising an inner liner comprising a thermoplastic elastomer composition. according to claim 2 .
16. A pneumatic tire comprising an inner liner comprising a thermoplastic elastomer composition according to claim 3 .
17. A pneumatic tire comprising an inner liner comprising a thermoplastic elastomer composition according to claim 4 .
18. A pneumatic tire comprising an inner liner comprising a thermoplastic elastomer composition according to claim 8 .
19. A pneumatic tire comprising an inner liner comprising a thermoplastic elastomer composition according to claim 9 .
20. A pneumatic tire comprising an inner liner comprising a thermoplastic elastomer composition according to claim 10 .