Tire with improved grip on wet ground
View Patent ↗A tire comprising at least a rubber composition based on at least a blend of natural rubber, NR, or synthetic polyisoprene, and a styrene-butadiene copolymer, SBR, the SBR having a content greater than or equal to 20 parts per hundred parts of elastomer, phr, a reinforcing filler comprising carbon black, characterized in that the composition comprises a plasticizing resin having a glass transition temperature, Tg, greater than or equal to 20° C. and that the SBR has a Tg greater than or equal to −65° C.
1. A tire comprising at least a rubber composition based on at least:
a blend of natural rubber, NR, or synthetic polyisoprene, wherein the content of NR or synthetic polyisoprene ranges from 30 phr to 80 phr, and
a styrene-butadiene copolymer, SBR, the SBR having a content greater than or equal to 20 parts per hundred parts of elastomer, phr,
a reinforcing filler comprising carbon black, and
a plasticizing resin having a glass transition temperature, Tg, greater than or equal to 20° C., wherein the SBR has a Tg greater than or equal to −65° C.
2. The tire according to claim 1 , wherein the SBR content ranges from 20 phr to 80 phr.
3. The tire according to claim 2 , wherein the SBR content ranges from 20 to 60 phr.
4. The tire according to claim 1 , wherein the composition is further based on a polybutadiene, BR.
5. The tire according to claim 1 , wherein the content of NR or synthetic polyisoprene ranges from 30 phr to 80 phr.
6. The tire according to claim 5 1, wherein the content of NR or synthetic polyisoprene is greater than or equal to 40 phr.
7. The tire according to claim 6 , wherein the content of NR or synthetic polyisoprene is greater than or equal to 60 phr.
8. The tire according to claim 1 , wherein the SBR has a Tg greater than or equal to −50° C.
9. The tire according to claim 1 , wherein the carbon black has a CTAB specific surface area of between 75 and 200 m 2 /g.
10. The tire according to claim 9 , wherein the carbon black has a CTAB specific surface area of between 100 and 150 m 2 /g.
11. The tire according to claim 1 , wherein the plasticizing resin has a Tg greater than or equal to 30° C.
12. The tire according to claim 1 , wherein the content of plasticizing resin ranges from 1 to 20 phr.
13. The tire according to claim 12 , wherein the content of plasticizing resin is less than or equal to 10 phr.
14. The tire according to claim 1 , wherein the content of reinforcing filler ranges from 20 to 200 phr.
15. The tire according to claim 14 , wherein the content of reinforcing filler ranges from 40 to 70 phr.
16. The tire according to claim 1 , wherein the reinforcing filler comprises an inorganic filler.
17. The tire according to claim 16 , wherein the inorganic filler constitutes at least 10% by weight of the total reinforcing filler.
18. The tire according to claim 16 , wherein the inorganic filler constitutes at most 50% by weight of the total reinforcing filler.
19. The tire according to claim 16 , wherein the inorganic filler comprises silica.
20. The tire according to claim 19 , wherein the inorganic filler consists of silica.
21. The tire comprising a tread having a rubber composition according to claim 1 .