Rubber tyre composition containing a diester plasticizer
View Patent ↗Rubber composition comprising at least one diene elastomer, one reinforcing filler and one 1,2-cyclohexanedicarboxylate diester plasticizer corresponding to the formula (R hydrocarbon radical): The invention also relates to the use of such a composition in the manufacture of a tire or of a tire semi-finished product made of rubber, in particular of a tire tread exhibiting an improved wet grip, without adversely affecting its other properties; it also relates to the tires and semi-finished products themselves and to a plasticizing system comprising, in combination, the said diester plasticizer and a plasticizing hydrocarbon resin, the glass transition temperature (Tg) of which is greater than 0° C.
1. A tire tread comprising a rubber composition comprising:
at least one diene elastomer selected from the group consisting of polybutadienes, synthetic polyisoprenes, natural rubber, butadiene copolymers, isoprene copolymers and the mixtures of these elastomers,
a reinforcing filler, and
a 1,2-cyclohexanedicarboxylate diester plasticizer corresponding to the formula (I):
wherein the R radicals, which are identical or different, represent a hydrocarbon radical.
2. The tire tread according to claim 1 , wherein the R radicals, which are identical or different, are chosen from the group consisting of linear, branched or cyclic alkyls comprising from 1 to 30 carbon atoms and aryls, aralkyls or alkaryls comprising from 6 to 30 carbon atoms.
3. The tire tread according to claim 2 , wherein the R radicals represent a linear, branched or cyclic alkyl group comprising from 1 to 20 carbon atoms.
4. The tire tread according to claim 3 , wherein the R radicals comprise from 8 to 11 carbon atoms.
5. The tire tread according to claim 4 , wherein the diester plasticizer is a diisononyl 1,2-cyclohexanedicarboxylate, of formula (II):
6. The tire tread according to claim 1 , wherein the level of diester plasticizer is between 5 and 60 pce.
7. The tire tread according to claim 6 , wherein the level of diester plasticizer is between 5 and 40 pce.
8. The tire tread according to claim 1 , further comprising a plasticizing hydrocarbon resin having a glass transition temperature greater than 0° C.
9. The tire tread according to claim 8 , wherein the plasticizing hydrocarbon resin has a Tg of greater than +20° C.
10. The tire tread according to claim 8 , wherein the number-average molecular weight of the hydrocarbon resin is between 400 and 2000 g/mol.
11. The tire tread according to claim 8 , wherein the polydispersity index of the hydrocarbon carbon is less than 3.
12. The tire tread according to claim 8 , wherein the plasticizing hydrocarbon resin is chosen from the group consisting of cyclopentadiene (abbreviated to CPD) or dicyclopentadiene (abbreviated to DCPD) homopolymer or copolymer resins, terpene homopolymer or copolymer resins, C 5 fraction homopolymer or copolymer resins and the mixtures of these resins.
13. The tire tread according to claim 12 , wherein the plasticizing hydrocarbon resin is chosen from the group consisting of (D)CPD homopolymer resins, (D)CPD/styrene copolymer resins, polylimonene resins, limonene/styrene copolymer resins, limonene/(D)CPD copolymer resins, C 5 fraction/styrene copolymer resins, C 5 fraction/C 9 fraction copolymer resins and the mixtures of these resins.
14. The tire tread according to claim 8 , wherein the level of plasticizing hydrocarbon resin is between 5 and 60 pce.
15. The tire tread according to claim 1 , wherein the reinforcing filler comprises carbon black.
16. The tire tread according to claim 1 , wherein the reinforcing filler comprises silica.
17. A tire comprising a rubber composition comprising:
at least one diene elastomer selected from the group consisting of polybutadienes, synthetic polyisoprenes, natural rubber, butadiene copolymers, isoprene copolymers and the mixtures of these elastomers,
a reinforcing filler, and
a 1,2-cyclohexanedicarboxylate diester plasticizer corresponding to the formula (I):
wherein the R radicals, which are identical or different, represent a hydrocarbon radical.
18. The tire according to claim 17 , wherein the R radicals, which are identical or different, are chosen from the group consisting of linear, branched or cyclic alkyls comprising from 1 to 30 carbon atoms and aryls, aralkyls or alkaryls comprising from 6 to 30 carbon atoms.
19. The tire according to claim 18 , wherein the R radicals represent a linear, branched or cyclic alkyl group comprising from 1 to 20 carbon atoms.
20. The tire according to claim 19 , wherein the R radicals comprise from 8 to 11 carbon atoms.
21. The tire according to claim 20 , wherein the diester plasticizer is a diisononyl 1,2-cyclohexanedicarboxylate, of formula (II):
22. The tire according to claim 17 , wherein the level of diester plasticizer is between 5 and 60 pce.
23. The tire according to claim 22 , wherein the level of diester plasticizer is between 5 and 40 pce.
24. The tire according to claim 17 , further comprising a plasticizing hydrocarbon resin having a glass transition temperature greater than 0° C.
25. The tire according to claim 24 , wherein the plasticizing hydrocarbon resin has a Tg of greater than +20° C.
26. The tire according to claim 24 , wherein the number-average molecular weight of the hydrocarbon resin is between 400 and 2000 g/mol.
27. The tire according to claim 24 , wherein the polydispersity index of the hydrocarbon carbon is less than 3.
28. The tire according to claim 24 , wherein the plasticizing hydrocarbon resin is chosen from the group consisting of cyclopentadiene (abbreviated to CPD) or dicyclopentadiene (abbreviated to DCPD) homopolymer or copolymer resins, terpene homopolymer or copolymer resins, C 5 fraction homopolymer or copolymer resins and the mixtures of these resins.
29. The tire according to claim 28 , wherein the plasticizing hydrocarbon resin is chosen from the group consisting of (D)CPD homopolymer resins, (D)CPD/styrene copolymer resins, polylimonene resins, limonene/styrene copolymer resins, limonene/(D)CPD copolymer resins, C 5 fraction/styrene copolymer resins, C 5 fraction/C 9 fraction copolymer resins and the mixtures of these resins.
30. The tire according to claim 24 , wherein the level of plasticizing hydrocarbon resin is between 5 and 60 pce.
31. The tire according to claim 17 , wherein the reinforcing filler comprises carbon black.
32. The tire tread according to claim 17 , wherein the reinforcing filler comprises silica.