Thermoplastic elastomer composition

1. A thermoplastic elastomer composition comprising:

an ethylene propylene diene monomer (EPDM);

a polybutene (PB);

a polypropylene (PP);

a paraffin oil;

a peroxide cross-linking agent; and

an antioxidant,

wherein the EPDM comprises 80 to 90 parts by weight.

2. The thermoplastic elastomer composition of claim 1 , wherein the EPDM comprises 80 parts by weight.

3. The thermoplastic elastomer composition of claim 1 , wherein the PB comprises 30 to 50 parts by weight.

4. The thermoplastic elastomer composition of claim 1 , wherein the PB comprises 40 parts by weight.

5. The thermoplastic elastomer composition of claim 1 , wherein the PP comprises 30 to 40 parts by weight.

6. The thermoplastic elastomer composition of claim 1 , wherein the PP comprises 30 parts by weight.

7. The thermoplastic elastomer composition of claim 1 , wherein the paraffin oil comprises 110 to 130 parts by weight.

8. The thermoplastic elastomer composition of claim 1 , wherein the paraffin oil comprises 120 parts by weight.

9. The thermoplastic elastomer composition of claim 1 , wherein the peroxide cross-linking agent comprises 0.7 to 0.9 parts by weight.

10. The thermoplastic elastomer composition of claim 1 , wherein the peroxide cross-linking agent comprises 0.8 parts by weight.

11. The thermoplastic elastomer composition of claim 1 , wherein the antioxidant comprises 0.5 to 0.8 parts by weight.

12. The thermoplastic elastomer composition of claim 1 , wherein the antioxidant comprises 0.7 parts by weight.

13. The thermoplastic elastomer composition of claim 1 , wherein the paraffin oil has a kinematic viscosity of 170 cSt or higher at 40° C.

14. The thermoplastic elastomer composition of claim 1 , wherein the antioxidant is zinc oxide (ZnO).

15. The thermoplastic elastomer composition of claim 1 , further comprising 0.4 to 0.6 part by weight of one additive selected from the group consisting of a co-cross-linking agent, a lubricant, a wax, a filler, and any combination thereof.

16. A thermoplastic elastomer composition comprising:

80 to 90 parts by weight of an ethylene propylene diene monomer (EPDM);

30 to 50 parts by weight of polybutene (PB);

30 to 40 parts by weight of polypropylene (PP);

110 to 130 parts by weight of paraffin oil;

0.7 to 0.9 parts by weight of a peroxide cross-linking agent;

0.5 to 0.8 parts by weight of an antioxidant; and

optionally 0.4 to 0.6 part by weight of one additive selected from the group consisting of a co-cross-linking agent, a lubricant, a wax, a filler, and any combination thereof, wherein the thermoplastic elastomer composition is used to manufacture a joint connecting a glass run and an inner-belt by integrally injection-molding the glass run and the inner-belt.

17. The thermoplastic elastomer composition of claim 16 , wherein the paraffin oil has a kinematic viscosity of 170 cSt or higher at 40° C.

18. The thermoplastic elastomer composition of claim 16 , wherein the antioxidant is zinc oxide (ZnO).

19. A thermoplastic elastomer composition comprising:

80 parts by weight of an ethylene propylene diene monomer (EPDM);

40 parts by weight of polybutene (PB);

30 parts by weight of polypropylene (PP);

120 parts by weight of paraffin oil, wherein the paraffin oil has a kinematic viscosity of 170 to 180 cSt at 40° C.;

0.8 parts by weight of a peroxide cross-linking agent;

0.7 parts by weight of an antioxidant, wherein the antioxidant is zinc oxide (ZnO); and

optionally 0.5 part by weight of one additive selected from the group consisting of a co-cross-linking agent, a lubricant, a wax, a filler, and any combination thereof, wherein the thermoplastic elastomer composition is used to manufacture a joint connecting a glass run and an inner-belt by integrally injection-molding the glass run and the inner-belt.