Tire tread
A tire tread comprises a rubber composition based on at least one natural or synthetic polyisoprene, at a content ranging from 50 phr to 100 phr, a reinforcing filler comprising predominantly, by weight, inorganic filler, a coupling agent, a plasticizing agent at a content of less than or equal to 10 phr and a sulphur-based crosslinking system. The composition contains a zinc content ranging from 0.7 to 2 phr.
1. A tire tread comprising a rubber composition based on:
at least one natural or synthetic polyisoprene, at a content ranging from 60 phr to 90 phr;
a reinforcing filler comprising inorganic filler
a coupling agent;
a plasticizing agent at a content of less than or equal to 10 phr;
a sulphur-based crosslinking system; and
a polybutadiene or a butadiene-styrene copolymer at a content ranging from 10 to 40 phr,
wherein the rubber composition contains a zinc content ranging from 0.7 to 2 phr.
2. The tire tread according to claim 1 , wherein the inorganic filler comprises silica.
3. The tire tread according to claim 1 , wherein the inorganic filler consists of silica.
4. The tire tread according to claim 1 , wherein the zinc content ranges from 1 to 1.5 phr.
5. The tire tread according to claim 1 , wherein the inorganic filler represents at least 60% by weight of the reinforcing filler.
6. The tire tread according to claim 5 , wherein the inorganic filler represents at least 75% by weight of the reinforcing filler.
7. The tire tread according to claim 6 , wherein the inorganic filler represents at least 90% of the reinforcing filler.
8. The tire tread according to claim 1 , wherein the rubber composition is further based on a third diene elastomer different from the other elastomers, said third diene elastomer selected from the group consisting of polybutadienes, styrene-butadiene copolymers, isoprene-butadiene copolymers, isoprene-styrene copolymers and isoprene-butadiene-styrene copolymers.
9. The tire tread according to claim 1 , wherein a total content of reinforcing filler ranges from 30 to 90 phr.
10. The tire tread according to claim 9 , wherein the total content of reinforcing filler ranges from 40 to 80 phr.
11. The tire tread according to claim 10 , wherein the total content of reinforcing filler ranges from 45 to 70 phr.
12. The tire tread according to claim 1 , wherein the content of plasticizing agent is less than or equal to 5 phr.
13. The tire tread according to claim 4 , wherein the content of plasticizing agent is less than or equal to 2 phr.
14. A tire comprising a tread according to claim 1 .