Rubber composition and pneumatic tire
An object of the present invention is to provide a rubber composition capable of producing a pneumatic tire with both satisfactory heat build-up reduction and excellent wet skid performance, and a pneumatic tire comprising the rubber composition. The rubber composition of the present invention contains a diene-based rubber containing from 5 to 40 mass % of a modified butadiene rubber and a white filler. The modified butadiene rubber is a modified polymer obtained by modifying an unmodified butadiene rubber (A) with a nitrone compound (B) having a carboxy group.
1. A rubber composition comprising:
a diene-based rubber containing from 5 to 40 mass % of a modified butadiene rubber; and
a white filler; wherein
the modified butadiene rubber is a modified polymer obtained by modifying an unmodified butadiene rubber (A) with a nitrone compound (B) having a carboxy group; wherein the nitrone compound (B) is
a compound selected from the group consisting of N-phenyl-α-(4-carboxyphenyl)nitrone, N-phenyl-α-(3-carboxyphenyl)nitrone, N-phenyl-α-(2-carboxyphenyl)nitrone, N-(4-arboxyphenyl)-α-phenylnitrone, N-(3-carboxyphenyl)-α-phenylnitrone, and N-(2-carboxyphenyl)-α-phenylnitrone.
2. The rubber composition according to claim 1 , wherein a content of the white filler is from 8 to 130 parts by mass per 100 parts by mass of the diene-based rubber.
3. The rubber composition according to claim 1 , wherein a modification ratio of the modified butadiene rubber is from 0.01 to 2.0 mol %.
4. A pneumatic tire comprising the rubber composition described in claim 1 .
5. The rubber composition according to claim 2 , wherein a modification ratio of the modified butadiene rubber is from 0.01 to 2.0 mol %.
6. A pneumatic tire comprising the rubber composition described in claim 2 .
7. A pneumatic tire comprising the rubber composition described in claim 3 .