초록 ▼

The present invention relates to a cross-linkable or cross-linked rubber composition usable in a tread of a tire, and to a tire incorporating this tread. A rubber composition according to the invention is based on at least one diene elastomer, and a plasticizer comprising a glycerol oleic acid tries

The present invention relates to a cross-linkable or cross-linked rubber composition usable in a tread of a tire, and to a tire incorporating this tread. A rubber composition according to the invention is based on at least one diene elastomer, and a plasticizer comprising a glycerol oleic acid triester, said plasticizer comprises: one or more synthetic and/or natural compounds not extracted from petroleum in a mass fraction of from 45% to 100%, said compounds comprising at least one glycerol fatty acid triester, and the fatty acid(s) as a whole comprise oleic acid in a mass fraction equal to or greater than 60%, and one or more paraffinic, aromatic or naphthenic type plasticizing oils extracted from petroleum in a mass fraction of from 55% to 0%. The invention applies in particular to tires of passenger-vehicle type.

대표청구항 ▼

We claim: 1. A cross-linkable or cross-linked rubber composition usable for constituting a tire tread, said composition being based on one or more diene elastomers and a plasticizer, wherein said plasticizer comprises: one or more synthetic and/or natural compounds not extracted from petroleum pres

We claim: 1. A cross-linkable or cross-linked rubber composition usable for constituting a tire tread, said composition being based on one or more diene elastomers and a plasticizer, wherein said plasticizer comprises: one or more synthetic and/or natural compounds not extracted from petroleum present in a mass fraction of from 45% to 100%, wherein at least one of said natural compounds is sunflower oil, said sunflower oil comprising at least one glycerol fatty acid triester, wherein as a whole, the fatty acids in said sunflower oil comprise oleic acid in a mass fraction equal to or greater than 70%, wherein the amount of said sunflower oil in the composition is from 10 to 40 phr, one or more plasticizing oils extracted from petroleum in a mass fraction of from 0% to 55%, wherein the plasticizing oils are selected from the group consisting of paraffinic, aromatic and naphthenic oils; and a hydrocarbon plasticizing resin in a quantity of from 5 to 20 phr, wherein said hydrocarbon plasticizing resin is miscible in said diene elastomer(s), has a glass transition temperature of between 10�� C. and 150�� C. and a number-average molecular weight of between 400 g/mol and 2000 g/mol. 2. The cross-linkable or cross-linked rubber composition according to claim 1, wherein the fatty acids comprise oleic acid in a mass fraction equal to or greater than 85%. 3. The cross-linkable or cross-linked rubber composition according to claim 1, wherein said synthetic compound not extracted from petroleum is glycerol oleic acid triester. 4. The cross-linkable or cross-linked rubber composition according to claim 1, wherein said plasticizers comprises one or more synthetic and/or natural compounds not extracted from petroleum in a mass fraction of from 70% to 100%, and said one or more plasticizing oils extracted from petroleum is in a mass fraction of from 0% to 30%. 5. The cross-linkable or cross-linked rubber composition according to according to claim 4, wherein said plasticizer comprises one or more synthetic and/or natural compounds not extracted from petroleum in a mass fraction of from 80% to 100%, and said one or more plasticizing oils extracted from petroleum in a mass fraction from 0% to 20%. 6. The cross-linkable or cross-linked rubber composition according to claim 5, wherein said plasticizer comprises one or more synthetic and/or natural compounds not extracted from petroleum in a mass of 100%. 7. The cross-linkable or cross-linked rubber composition according to claim 1, wherein said composition comprises one or more plasticizing oils extracted from petroleum in a quantity of from 0 to 30 phr. 8. The cross-linkable or cross-linked rubber composition according to claim 7, wherein said composition comprises one or more synthetic and/or natural compounds not extracted from petroleum in a quantity of from 20 to 35 phr, and said one or more plasticizing oils extracted from petroleum in a quantity of from 0 to 20 phr. 9. The cross-linkable or cross-linked rubber composition according to claim 1, wherein said composition comprises between 50 phr and 100 phr of a majority of diene elastomer having a glass transition temperature of between-65�� C. and-10�� C., and between 0 phr and 50 phr of a minority diene elastomer having a glass transition temperature of between-110�� C. and-80�� C. 10. The cross-likable or cross-linked rubber composition according to claim 9, wherein said majority diene elastomer is selected from the group consisting of solution-prepared styrene-butadiene copolymers, emulsion-prepared styrene-butadiene copolymers, natural polyisoprenes, synthetic polyisoprenes having a cis-1,4 linkage content greater than 95% and mixtures thereof, and said minority diene elastomer is a polybutadiene having a cis-1,4 linkage content greater than 90%. 11. The cross-likable or cross-linked rubber composition according to claim 10, wherein said solution prepared styrene-butadiene copolymer have a glass transition temperature of from-50�� C. to-15�� C. and trans-1,4 butadiene linkage content which is greater than 50%. 12. The cross-likable or cross-linked rubber composition according to claim 11, wherein said emulsion-prepared styrene-butadiene copolymers have a glass transition temperature of from-55�� C. to-30�� C. 13. The cross-linkable or cross-linked rubber composition according to claim 9, wherein said majority diene elastomer is present in a quantity of 100 phr. 14. The cross-linkable or cross-linked rubber composition according to claim 9, wherein said composition comprises a blend of said majority and minority diene elastomers. 15. The cross-linkable or cross-linked rubber composition according to claim 14, wherein the blend comprises polybutadienes having a cis-1,4 linkage content greater than 90% and an emulsion-prepared styrene-butadiene copolymer. 16. The cross-likable or cross-linked rubber composition according to claim 1, wherein said reinforcing filler is carbon black in a quantity of from 60 to 200 phr. 17. The cross-likable or cross-linked rubber composition according to claim 1, wherein said reinforcing filler is a reinforcing white filler in a quantity equal to or greater than 70 phr. 18. The cross-likable or cross-linked rubber composition according to claim 1, wherein said reinforcing filler is a bled of carbon black and a reinforcing white filler. 19. The cross-likable or cross-linked rubber composition according to claim 1, wherein said plasticizing resin has a glass transition temperature of from 30�� C. to 100�� C., a number-average molecular weight of between 400 and 1000 g/mol, and a polymolecularity index less than 2. 20. A tread for a tire comprising a rubber composition in accordance with claim 1. 21. A tire comprising a tread according to claim 20.