Rubber composition for tire
Provided is a rubber composition for tires containing, per 100 parts by mass of diene rubber, from 5 to 120 parts by mass of carbon black having a nitrogen adsorption specific surface area N 2 SA of 90 m 2 /g or less and a compressed DBP absorption (24M4) of 95 to 120 mL/100 g, a ratio ΔDst/Dst of a half width ΔDst (nm) of a mode diameter Dst to the mode diameter Dst (nm) in a Stokes diameter mass distribution curve of aggregates of the carbon black being 0.65 or greater, and the N 2 SA, (24M4), and Dst satisfying the following formula: (24M4)/Dst<0.0093×N 2 SA−0.06.
1. A rubber composition for a tire, the rubber composition comprising: per 100 parts by mass of diene rubber, from 5 to 120 parts by mass of carbon black having a nitrogen adsorption specific surface area N 2 SA of 85 m 2 /g or less and a compressed DBP absorption (24M4) of 95 to 120 mL/100 g, a ratio ΔDst/Dst of a half width ΔDst (nm) of a mode diameter Dst to the mode diameter Dst (nm) in a Stokes diameter mass distribution curve of aggregates of the carbon black being 0.65 or greater, and the N 2 SA, the (24M4), and the Dst satisfying Formula (1) below:
(24M4)/Dst<0.0093×N 2 SA−0.06 (1)
wherein Dst is a mode diameter (nm) in Stokes diameter mass distribution curve of aggregates and is 160 nm or greater, N 2 SA is a nitrogen adsorption specific surface area (m 2 /g), and (24M4) is a compressed DBP absorption (mL/100 g).
2. The rubber composition for a tire according to claim 1 , wherein the N 2 SA is 50 m 2 /g or greater.
3. The rubber composition for a tire according to claim 1 , wherein the ΔDst is from 159 to 202 nm.
4. A pneumatic tire that uses the rubber composition for a tire according to claim 1 .
5. A rubber composition for a tire for a construction vehicle, the rubber composition comprising: per 100 parts by mass of diene rubber containing 60 mass % or greater of natural rubber, from 30 to 80 parts by mass of inorganic filler containing carbon black having a nitrogen adsorption specific surface area N 2 SA of 85 m 2 /g or less and a compressed DBP absorption (24M4) of 95 to 120 mL/100 g, a ratio ΔDst/Dst of a half width ΔDst (nm) of a mode diameter Dst to the mode diameter Dst (nm) in a Stokes diameter mass distribution curve of aggregates of the carbon black being 0.65 or greater, and the N 2 SA, the (24M4), and the Dst satisfying Formula (1) below:
(24M4)/Dst<0.0093×N 2 SA−0.06 (1)
wherein Dst is a mode diameter (nm) in Stokes diameter mass distribution curve of aggregates and is 160 nm or greater, N 2 SA is a nitrogen adsorption specific surface area (m 2 /g), and (24M4) is a compressed DBP absorption (mL/100 g).
6. The rubber composition for a tire for a construction vehicle according to claim 5 , wherein the N 2 SA is 50 m 2 /g or greater.
7. The rubber composition for a tire for a construction vehicle according to claim 6 , wherein the inorganic filler further contains from 5 to 25 parts by mass of silica.
8. The rubber composition for a tire for a construction vehicle according to claim 7 , wherein greater than 30 parts by mass of the carbon black are compounded.
9. The rubber composition for a tire for a construction vehicle according to claim 5 , wherein the inorganic filler further contains from 5 to 25 parts by mass of silica.
10. The rubber composition for a tire for a construction vehicle according to claim 5 , wherein greater than 30 parts by mass of the carbon black are compounded.
11. A pneumatic tire for a construction vehicle comprising a tread portion formed using the rubber composition for a tire according to claim 5 .
12. A pneumatic tire for a construction vehicle comprising a tread portion formed using the rubber composition for a tire according to claim 8 .