Rubber composition for tire tread and tire
According to the rubber composition for a tire tread comprising a diene-based rubber component, and, based on 100 parts by mass of the diene-based rubber component, 0.5 to 6.0 parts by mass of a branched alkane of 40 to 70 carbon atoms, 0.05 to 3.5 parts by mass of a linear alkane of 45 or more carbon atoms and 1 to 35 parts by mass of aluminum hydroxide, and a tire comprising tread composed of the rubber composition for a tire tread of the present invention, a rubber composition for a tire tread capable of improving initial wet grip performance can be provided, thereby providing a tire having such improved initial wet grip performance.
1. A rubber composition for a tire tread, comprising
a diene-based rubber component;
a microcrystalline wax having a melting point of from 72 to 84° C.; and
an aluminum hydroxide having a nitrogen absorption specific surface area of 3.0 to 60.0 m2/g,
wherein the microcrystalline wax comprises a branched alkane of 40 to 70 carbon atoms and a linear alkane of 45 or more carbon atoms, and,
wherein, based on 100 parts by mass of the diene-based rubber component, a content of the branched alkane of 40 to 70 carbon atoms is 0.5 to 6.0 parts by mass, a content of the linear alkane of 45 or more carbon atoms is 0.05 to 3.5 parts by mass and a content of the aluminum hydroxide of a nitrogen absorption specific surface area of 3.0 to 60.0 m 2 /g is 1 to 35 parts by mass.
2. A tire comprising a tread composed of the rubber composition for a tire tread of claim 1 .
3. The rubber composition for a tire tread of claim 1 , wherein the rubber composition further comprises 3 to 30 parts by mass of a liquid diene-based polymer.
4. The rubber composition for a tire tread of claim 1 , wherein a content of the aluminum hydroxide is 10 parts by mass or more and 35 parts by mass or less based on 100 parts by mass of the diene-based rubber component.
5. The rubber composition for a tire tread of claim 1 , wherein an average primary particle size of the aluminum hydroxide is 0.5 μm or more and 10 μm or less.
6. The rubber composition for a tire tread of claim 1 , wherein the diene-based rubber component comprises 50% by mass or more of a styrene-butadiene rubber.
7. The rubber composition for a tire tread of claim 1 , wherein the rubber composition further comprises silica.
8. The rubber composition for a tire tread of claim 3 , wherein the liquid diene-based polymer comprises a liquid styrene-butadiene copolymer.
9. The rubber composition for a tire tread of claim 1 , wherein the rubber composition further comprises a tackifying resin.
10. The rubber composition for a tire tread of claim 9 , wherein the tackifying resin comprises a styrene terpene resin.
11. The rubber composition for a tire tread of claim 1 , wherein the rubber composition further comprises a plasticizer.
12. The rubber composition for a tire tread of claim 11 , wherein the plasticizer comprises bis(2-ethylhexyl)sebacate.