Rubber composition, crosslinked product, and tire

1. A rubber composition, comprising:

(A) a modified conjugated diene-based polymer;

(B) modified silica; and

(C) a polymer having crystalline character and a melting point of 50° C. or higher,

wherein the polymer having crystalline character (C) comprises a polyethylene, polypropylene, ethylene-propylene copolymer, polystyrene, ethylene-1-butene copolymer, and/or ethylene-propylene-1-butene copolymer.

2. A composition of claim 1 , wherein the polymer having crystalline character (C) has a crystallinity in a range of from 5 to 70%.

3. The composition of claim 1 , wherein the polymer having crystalline character (C) is present in a range of from 1 to 15 mass %, relative to an entire rubber composition mass.

4. The composition of claim 1 , wherein the polymer having crystalline character (C) comprises 1,2-polybutadiene and at least one selected from the group consisting of the polystyrene, the polypropylene, the polyethylene, and the ethylene-propylene copolymer.

5. The composition of claim 1 , wherein the polymer having crystalline character (C) further comprises syndiotactic 1,2-polybutadiene.

6. The composition of claim 1 , wherein the modified silica (B) has at least one group selected from the group consisting of an amino group, an amido group, a carboxy group, a carbinol ester group, a mercapto group, and a (poly)sulfide group.

7. The composition of claim 1 , wherein the modified conjugated diene-based polymer (A) is a product obtained through reaction between a conjugated diene-based polymer having an active terminal and a compound comprising a functional group capable of reacting with the active terminal and a functional group that interacts with silica.

8. A crosslinked product, obtained through crosslinking of the rubber composition of claim 1 .

9. A tire, comprising:

a tread; and

a sidewall,

wherein at least one of the tread and the sidewall is formed of the crosslinked product of claim 8 .

10. The tire, comprising the composition of claim 1 .

11. The composition of claim 1 , wherein the modified silica (B) comprises an amino group, an amido group, a carboxy group, a carbinol ester group, a mercapto group, and/or a (poly)sulfide group.

12. The composition of claim 1 , wherein the polymer having crystalline character (C) has a melting point in a range of from 65 to 140° C.

13. The composition of claim 1 , wherein the polymer having crystalline character (C) has a crystallinity in a range of from 5 to 18%.

14. The composition of claim 1 , wherein the polymer having crystalline character (C) further comprises a 1,2-polybutadiene having a crystallinity in a range of from 5 to 70%.

15. The composition of claim 1 , wherein the polymer having crystalline character (C) comprises the ethylene-propylene copolymer, polystyrene, ethylene-1-butene copolymer, and/or ethylene-propylene-1-butene copolymer.

16. The composition of claim 1 , comprising no more than 79 phr of inorganic fillers.

17. The composition of claim 1 , wherein the modified conjugated diene-based polymer (A) is present in a range of from 20 to 95 mass %, relative to an entire rubber composition mass.

18. The composition of claim 1 , wherein the modified conjugated diene-based polymer (A) is present in a range of from 30 to 90 mass %, relative to an entire rubber composition mass.

19. The composition of claim 1 , wherein the modified conjugated diene-based polymer (A) is present in a range of from 40 to 80 mass %, relative to an entire rubber composition mass.

20. The composition of claim 1 , wherein the modified conjugated diene-based polymer (A) is present in at least 70 phr.