IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0071500
(2005-03-03)
|
등록번호 |
US-7253225
(2007-08-07)
|
우선권정보 |
FR-02 10950(2002-09-04) |
발명자
/ 주소 |
- Labauze,Gerard
- Vasseur,Didier
|
출원인 / 주소 |
- Michelin Recherche et Technique, S.A.
|
대리인 / 주소 |
Fitzpatrick, Cella, Harper & Scinto
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
30 |
초록
▼
The invention relates to a cross-linked rubber composition for a tire tread having a Shore A hardness greater than 45 and less than 57, measured in accordance with Standard ASTM D 2240, wherein the composition comprises greater than 25 phr and up to 100 phr, of one or more diene elastomers each h
The invention relates to a cross-linked rubber composition for a tire tread having a Shore A hardness greater than 45 and less than 57, measured in accordance with Standard ASTM D 2240, wherein the composition comprises greater than 25 phr and up to 100 phr, of one or more diene elastomers each having a temperature Tg of between-75째 C. and-40째 C., less than 75 phr and down to 0 phr, of one or more diene elastomers each having a temperature Tg of between-110째 C. and-75째 C., from 5 phr to 35 phr, of at least one hydrocarbon plasticizing resin miscible in said elastomer(s), said resin having a Tg of between 10째 C. and 150째 C. and a molecular weight Mn of between 400 and 2000 g/mol, and from 5 phr to 35 phr of at least one synthetic or natural plasticizing compound which comprises at least one glycerol fatty acid triester, wherein an aggregate constituted by the fatty acid(s) comprises oleic acid in a mass fraction equal to or greater than 60%.
대표청구항
▼
The invention of claimed is: 1. A tire tread comprising a cross-linked rubber composition having a Shore A hardness greater than 45 and less than 57, measured in accordance with Standard ASTM D 2240 of 1997, said composition comprising: greater than 25 phr and up to 100 phr, of one or more diene el
The invention of claimed is: 1. A tire tread comprising a cross-linked rubber composition having a Shore A hardness greater than 45 and less than 57, measured in accordance with Standard ASTM D 2240 of 1997, said composition comprising: greater than 25 phr and up to 100 phr, of one or more diene elastomers each having a glass transition temperature Tg between-75째 C. and-40째 C., less than 75 phr and down to 0 phr, of one or more diene elastomers each having a glass transition temperature Tg between-110째 C. and-75째 C., from 5 phr to 35 phr, of at least one hydrocarbon plasticizing resin miscible in said diene elastomer(s), and said resin having a glass transition temperature Tg between 10째 C. and 150째 C. and a number-average molecular weight between 400 g/mol and 2000 g/mol, and from 5 phr to 35 phr, of natural plasticizing compound, comprising at least one glycerol fatty acid triester, wherein the at least one glycerol fatty acid triester is sunflower vegetable oil having a Tg between-100째 C. and-70째 C., and wherein oleic acid represents in a mass fraction at least 60% of the total of fatty acid(s). 2. A tire tread according to claim 1, wherein said diene elastomer having a Tg between 75째 C. and 40째 C. is selected from the group consisting of styrene/butadiene copolymers prepared in emulsion, natural polyisoprenes, synthetic polyisoprenes having a cis-1,4 linkage content greater than 95%, styrene/butadiene/isoprene terpolymers prepared in solution and mixtures thereof, and said diene elastomer having a Tg between-110째 C. and-75째 C. is selected from the group consisting of polybutadienes having a cis-1,4 linkage content greater than 90% and isoprene/butadiene copolymers prepared in solution. 3. A tire tread according to claim 2, wherein said diene elastomer having a Tg between-75째 C. and-40째 C. is selected from the group consisting of natural polyisoprenes and synthetic polyisoprenes having a cis-1,4 linkage content greater than 95%, and said diene elastomer having a Tg between-110째 C. and-75째 C. is a polybutadiene having a cis-1,4 linkage content greater than 90%. 4. A tire tread according to claim 1, wherein said rubber composition is comprised of a blend of said diene elastomer(s) of a Tg between-75째 C. and-40째 C., and of said diene elastomer(s) of a Tg between-110째 C. and-75째 C. 5. A tire tread according to claim 1, wherein said rubber composition has 100 phr of said diene elastomer(s) of a Tg between-75째 C. and-40째 C. 6. A tire tread according to claim 1, wherein said resin has a Tg from 30째 C. to 120째 C., and a number-average molecular weight Mn of from 500 g/mol to 1000 g/mol. 7. A tire tread according to claim 6, wherein said resin has a Tg greater than 50째 C. and less than 120째 C. 8. A tire tread according to claim 7, wherein said resin is comprised of units resulting from the polymerization of a monocyclic or bicyclic unsaturated terpene, in a mass fraction of from 70% to 100%. 9. A tire tread according to claim 8, wherein said resin has a glass transition temperature of from 60째 C. to 100째 C. 10. A tire tread according to claim 8, wherein said unsaturated terpene is a monocyclic unsaturated terpene. 11. A tire tread according to claim 9, wherein said unsaturated terpene is a monocyclic unsaturated terpene. 12. A tire tread according to claim 10, wherein said monocyclic unsaturated terpene is limonene or dipentene. 13. A tire tread according to claim 11, wherein said monocyclic unsaturated terpene is limonene or dipentene. 14. A tire tread according to claim 10, wherein said resin further comprises one or more units resulting from at least one hydrocarbon monomer selected from the group consisting of bicyclic unsaturated terpenes, monocyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons, cyclic dienes and conjugated dienes. 15. A tire tread according to claim 14, wherein said at least one hydrocarbon monomer is selected from the group consisting of α-pinene, styrene, alkyl styrene, dicyclopentadiene and isoprene. 16. A tire tread according to claim 10, wherein said resin is formed of said units resulting from the polymerization of said monocyclic unsaturated terpene. 17. A tire tread according to claim 16, wherein said monocyclic unsaturated terpene is limonene or dipentene. 18. A tire tread according to claim 8, wherein said unsaturated terpene is a bicyclic unsaturated terpene. 19. A tire tread according to claim 9, wherein said unsaturated terpene is a bicyclic unsaturated terpene. 20. A tire tread according to claim 18, wherein bicyclic unsaturated terpene is an α-pinene. 21. A tire tread according to claim 18, wherein said resin further comprises one or more units resulting from at least one hydrocarbon monomer selected from the group consisting of monocyclic unsaturated terpenes, monocyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons, cyclic dienes and conjugated dienes. 22. A tire tread according to claim 21, wherein said at least one hydrocarbon monomer is selected from the group consisting of limonene, dipentene, styrene, alkyl styrene, dicyclopentadiene and isoprene. 23. A tire tread according to claim 18, wherein said resin is formed of said units resulting from the polymerization of said bicyclic unsaturated terpene. 24. A tire tread according to claim 23, wherein bicyclic unsaturated terpene is an α-pinene. 25. A tire tread according to claim 7, wherein said resin comprises units resulting from the polymerization of vinylcyclohexene. 26. A tire tread according to claim 25, wherein said resin is formed of said units resulting from the polymerization of vinylcyclohexene. 27. A tire tread according to claim 25, wherein said resin further comprises one or more other units at least one of which has resulted from the polymerization of a hydrocarbon selected from the group consisting of monocyclic unsaturated terpenes, bicyclic unsaturated terpenes, monocyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons, cyclic dienes and conjugated dienes. 28. A tire tread according to claim 27, wherein said at least one hydrocarbon is selected from the group consisting of limonene, dipentene, α-pinene, styrene, alkyl styrene, dicyclopentadiene and isoprene. 29. A tire tread according to claim 1, wherein in said plasticizing compound, an aggregate formed by said fatty acid(s) comprises oleic acid in a mass fraction equal to or greater than 85%. 30. A tire tread according to claim 1, wherein said composition further comprises, from 0 phr to 15 phr, of one or more plasticizing oils extracted from petroleum of paraffinic, aromatic or naphthenic type. 31. A rubber compositien tire tread according to claim 30, wherein said composition is devoid of plasticizing oil extracted from petroleum. 32. A rubber compositien tire tread according to claim 1, wherein said composition comprises from 10 phr to 25 phr of said hydrocarbon plasticizing resin, and from 15 phr to 30 phr of said plasticizing compound. 33. A tire tread according to claim 1, said composition further comprising a reinforcing filler, wherein said reinforcing filler comprises a reinforcing inorganic filler in a mass fraction of from 50% to 100%. 34. A tire tread according to claim 1, said composition further comprising a reinforcing filler, wherein said reinforcing filler comprises carbon black in a mass fraction of from 50% to 100%. 35. A tire tread according to claim 1, said composition further comprising a reinforcing filler, wherein said reinforcing filler comprises a blend of a reinforcing inorganic filler and a carbon black. 36. A tire comprising a tire tread according to claim 1. 37. A tire according to claim 36, wherein said tread is a winter tread suitable for travelling on icy and snow-covered roads.
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