Tire rubber composition

1. A tire rubber composition comprising a blend of:

100 parts by weight of a diene rubber;

5 to 130 parts by weight of an inorganic filler; and

0.01 to 10 parts by weight of a tea extract containing a catechin and non-catechin tea polyphenols.

2. The tire rubber composition according to claim 1 ,

wherein the tea extract contains 5% by weight or more of the catechin.

3. The tire rubber composition according to claim 1 ,

wherein the inorganic filler is at least one selected from a carbon black and a silica.

4. The tire rubber composition according to claim 3 ,

wherein 20 parts by weight or more of the silica is blended with 100 parts by weight of the diene rubber.

5. A tire tread rubber composition comprising the tire rubber composition according to claim 1 ,

wherein the diene rubber contains 10% by weight or more of an aromatic vinyl-conjugated diene copolymer having a glass transition temperature of −25° C. or below,

the inorganic filler includes a carbon black having a nitrogen adsorption specific surface area of 100 to 140 m 2 /g and a silica having a CTAB adsorption specific surface area of 80 to 250 m 2 /g,

the tire tread rubber composition includes a blend of:

100 parts by weight of the diene rubber:

5 to 50 parts by weight of the carbon black and 30 to 90 parts by weight of the silica, a total amount of the carbon black and the silica being 40 to 100 parts by weight;

0.01 to 5 parts by weight of the tea extract;

3 to 40 parts by weight of a softener; and

a sulfur-containing silane coupling agent which is 2 to 15% by weight relative to a blending amount of the silica.

6. A tire tread rubber composition comprising the tire rubber composition according to claim 1 ,

wherein the diene rubber contains 10% by weight or more of a styrene-butadiene rubber having a glass transition temperature of −25° C. or above, and

the tire tread rubber composition includes a blend of:

100 parts by weight of the diene rubber;

80 to 150 parts by weight of the inorganic filler which contains 10 to 150 parts by weight of a carbon black having a nitrogen adsorption specific surface area of 140 to 350 m 2 /g;

0.01 to 5 parts by weight of the tea extract; and

60 to 200 parts by weight of a softener.

7. The tire tread rubber composition according to claim 6 ,

wherein the glass transition temperature of the styrene-butadiene rubber is −20° C. or above, and

20% by weight or more of the styrene-butadiene rubber is blended in the diene rubber.

8. The tire tread rubber composition according to claim 6 ,

wherein at least one selected from a terpene phenol resin and an aromatic modified terpene resin having a softening point of 80° C. to 130° C. is blended with 100 parts by weight of the diene rubber, in an amount of 7 to 70 parts by weight.

9. The tire tread rubber composition according to claim 7 ,

wherein at least one selected from a terpene phenol resin and an aromatic modified terpene resin having a softening point of 80° C. to 130° C. is blended with 100 parts by weight of the diene rubber, in an amount of 7 to 70 parts by weight.

10. The tire tread rubber composition according to claim 5 ,

wherein the tea extract includes at least one selected from the group consisting of (+)-catechin, (−)-epicatechin,(+)-gallocatechin, (−)-epigallocatechin, (−)-epicatechin gallate, and (−)-epigallocatechin gallate.

11. The tire tread rubber composition according to claim 6 ,

wherein the tea extract includes at least one selected from the group consisting of (+)-catechin, (−)-epicatechin, (+)-gallocatechin, (−)-epigallocatechin, (−)-epicatechin gallate, and (−)-epigallocatechin gallate.

12. A pneumatic tire comprising:

the tire rubber composition according to claim 1 .

13. A pneumatic tire comprising:

the tire tread rubber composition according to claim 5 .

14. A pneumatic tire comprising:

the tire tread rubber composition according to claim 6 .