Rubber composition with high processability for run-flat tire
The crosslinkable rubber composition comprises a first elastomer consisting of polybutadiene having a Mooney plasticity ranging from 40 to 70 Mooney units, the content of the first elastomer being strictly greater than 50 phr, a second elastomer, and a carbon black having a specific surface area within a range of values extending from 15 m 2 /g to 25 m 2 /g and an oil adsorption number of compressed sample (COAN) within a range of values extending from 65 ml/100 g to 85 ml/100 g.
1. A sidewall insert manufactured from a crosslinkable rubber composition comprising:
a first elastomer consisting of polybutadiene having a Mooney plasticity ranging from 40 to less than 55 Mooney units;
a second elastomer; and
a carbon black having a specific surface area within a range of values extending from 15 m 2 /g to 25 m 2 /g and an oil adsorption number of compressed sample (COAN) within a range of values extending from 65 ml/100 g to 85 ml/100 g.
2. The sidewall insert according to claim 1 , wherein the content of the first elastomer is greater than 50 phr.
3. The sidewall insert according to claim 1 , wherein the content of the first elastomer is within a range of values extending from 50 to 80 phr.
4. The sidewall insert according to claim 3 , wherein the content of the first elastomer is within a range of values extending from 55 to 75 phr.
5. The sidewall insert according to claim 4 , wherein the content of the first elastomer is within a range of values extending from 60 to 70 phr.
6. The sidewall insert according to claim 1 , wherein the second elastomer is a diene elastomer.
7. The sidewall insert according to claim 1 , wherein the second elastomer is selected from the group consisting of polybutadienes, synthetic polyisoprenes, natural rubber, butadiene copolymers, isoprene copolymers and mixtures thereof.
8. The sidewall insert according to claim 1 , wherein a content of carbon black is within a range of values extending from 30 to 100 phr.
9. The sidewall insert according to claim 8 , wherein the content of carbon black is within a range of values extending from 35 to 80 phr.
10. The sidewall insert according to claim 9 , wherein the content of carbon black is within a range of values extending from 40 to 75 phr.
11. The sidewall insert according to claim 10 , wherein the content of carbon black is within a range of values extending from 40 to 60 phr.
12. A run-flat tire comprising a sidewall insert according to claim 1 .
13. The run-flat tire according to claim 12 further comprising a carcass reinforcement comprising at least one carcass ply.
14. The run-flat tire according to claim 13 , wherein the carcass reinforcement comprises a single carcass ply.
15. The run-flat tire according to claim 13 , wherein the carcass ply comprises at least one reinforcing clement made of polyester.