Rubber composition including a specific hydrocarbon resin
View Patent ↗A rubber composition is based on at least one elastomer, a reinforcing filler, a crosslinking system and an optionally hydrogenated hydrocarbon-based resin, predominantly composed of units selected from the group consisting of cyclopentadiene, dicyclopentadiene, methylcyclopentadiene and mixtures thereof, said hydrocarbon-based resin having an average molecular weight Mz of less than 2000 g/mol and a glass transition temperature Tg, expressed in ° C., such that: Tg≥80−2*(% HA), wherein % HA represents the content of aromatic protons of said resin, the content of said hydrocarbon-based resin being within a range extending from 15 to 150 phr.
1. A rubber composition based on at least one elastomer, a reinforcing filler, a crosslinking system and an optionally hydrogenated hydrocarbon-based resin, predominantly composed of units selected from the group consisting of cyclopentadiene, dicyclopentadiene, methylcyclopentadiene and mixtures thereof, said hydrocarbon-based resin having an average molecular weight Mz of less than 2000 g/mol and a glass transition temperature Tg, expressed in ° C., such that Tg≥80−2*(% HA),
wherein % HA represents the content of aromatic protons of said hydrocarbon-based resin,
wherein the content of said hydrocarbon-based resin is within a range extending from 95 to 110 phr, and
wherein the reinforcing filler is a combination of silica and carbon black and a content of the reinforcing filler is present within a range extending from 40 to 160 phr, the silica being present at a content within a range extending from 40 to 150 phr.
2. The rubber composition according to claim 1 , wherein said hydrocarbon-based resin has an Mz of less than 1500 g/mol.
3. The rubber composition according to claim 1 , wherein said hydrocarbon-based resin has a glass transition temperature Tg, expressed in ° C., such that Tg≥85−2*(% HA).
4. The rubber composition according to claim 1 , wherein said hydrocarbon-based resin has a polydispersity index PI of less than 1.7.
5. The rubber composition according to claim 4 , wherein said hydrocarbon-based resin has a polydispersity index PI of less than 1.6.
6. The rubber composition according claim 1 , wherein said hydrocarbon-based resin has a content of aromatic protons of less than 50%.
7. The rubber composition according to claim 6 , wherein said hydrocarbon-based resin has a content of aromatic protons within a range extending from 0% to 20%.
8. The rubber composition according to claim 7 , wherein said hydrocarbon-based resin has a content of aromatic protons within a range extending from 0% to 15%.
9. The rubber composition according to claim 8 , wherein said hydrocarbon-based resin has a content of aromatic protons of less than 5%.
10. The rubber composition according to claim 9 , wherein said hydrocarbon-based resin has a content of aromatic protons within a range extending from 0% to 4%.
11. The rubber composition according to claim 10 , wherein said hydrocarbon-based resin has a content of aromatic protons within a range extending from 0% to 2%.
12. The rubber composition according to claim 11 , wherein said hydrocarbon-based resin has a content of aromatic protons of 0%.
13. The rubber composition according to claim 7 , wherein said hydrocarbon-based resin has a content of aromatic protons within a range extending from 3% to 15%.
14. The rubber composition according to claim 13 , wherein said hydrocarbon-based resin has a content of aromatic protons within a range extending from 5% to 10%.
15. The rubber composition according to claim 1 , wherein said hydrocarbon-based resin has a content of ethylenic protons of less than 0.5%.
16. The rubber composition according to claim 15 , wherein said hydrocarbon-based resin has a content of ethylenic protons of less than 0.1%.
17. The rubber composition according to claim 15 , wherein the resin does not comprise any ethylenic units.
18. The rubber composition according to claim 1 , wherein the at least one elastomer predominantly comprises an elastomer having a glass transition temperature Tg of less than −70° C.
19. The rubber composition according to claim 18 , wherein the at least one elastomer predominantly comprises an elastomer having a glass transition temperature Tg of between −70° C. and −110° C.
20. The rubber composition according to claim 18 , wherein the at least one elastomer predominantly comprises an elastomer having a glass transition temperature Tg of between −80° C. and −110° C.
21. The rubber composition according to claim 20 , wherein the at least one elastomer predominantly comprises an elastomer having a glass transition temperature Tg of between −90° C. and −110° C.
22. The rubber composition according to claim 1 , wherein the at least one elastomer predominantly comprises an essentially unsaturated diene elastomer.
23. The rubber composition according to claim 22 , wherein the essentially unsaturated diene elastomer is selected from the group consisting of polybutadienes, butadiene copolymers, and mixtures thereof.
24. The rubber composition according to claim 23 , wherein the essentially unsaturated diene elastomer is selected from the group consisting of polybutadienes, copolymers of butadiene and styrene, and mixtures thereof.
25. The rubber composition according to claim 1 , wherein a predominant reinforcing filler is silica.
26. The rubber composition according to claim 1 , wherein a minority amount of carbon black is present.
27. The rubber composition according to claim 26 , wherein the carbon black is present at a content within a range extending from 0.1 to 10 phr.
28. A tire comprising a rubber composition according to claim 1 .
29. The tire according to claim 28 , wherein the rubber composition is present in all or part of the tread of the tire.