A sealing material includes the following characteristics: a value of a dynamic elastic modulus, measured at a temperature of 80�� C., at a frequency of 1 Hz, and with a deformation of 5%, that is at least 60% lower than a value of the dynamic elastic modulus measured at the temperature of 80�� C.,
A sealing material includes the following characteristics: a value of a dynamic elastic modulus, measured at a temperature of 80�� C., at a frequency of 1 Hz, and with a deformation of 5%, that is at least 60% lower than a value of the dynamic elastic modulus measured at the temperature of 80�� C., at the frequency of 1 Hz, and with a deformation of 1%; and the value of the dynamic elastic modulus, measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 5%, that is greater than or equal to 0.05 kPa. A tire for a vehicle wheel includes a carcass structure comprising at least one carcass ply and at least one layer of sealing material disposed in a radially inner position with respect to the at least one carcass ply. A process for producing the tire is also disclosed.
대표청구항▼
The invention claimed is: 1. A tyre for a vehicle wheel, comprising: a carcass structure comprising at least one carcass ply; a belt structure disposed in a circumferentially outer position with respect to the carcass structure; a tread circumferentially superimposed on the belt structure; a pair o
The invention claimed is: 1. A tyre for a vehicle wheel, comprising: a carcass structure comprising at least one carcass ply; a belt structure disposed in a circumferentially outer position with respect to the carcass structure; a tread circumferentially superimposed on the belt structure; a pair of sidewalls disposed laterally on opposite sides with respect to the carcass structure; and at least one layer of sealing material obtained by thermal degradation of a composition comprising at least one thermally degradable polymer, said composition comprising: 100 phr of at least one thermally degradable polymer; greater than or equal to 50 phr and less than or equal to 150 phr of at least one reinforcing filler; greater than or equal to 30 phr and less than or equal to 100 phr of at least one plasticizer; and greater than or equal to 10 phr of at least one organic peroxide; wherein the at least one carcass ply is shaped in a substantially toroidal configuration, wherein opposite lateral edges of the at least one carcass ply are associated with respective bead wires, wherein each bead wire is enclosed in a respective bead, wherein the belt structure comprises at least one belt strip, wherein the at least one layer of sealing material is disposed in a radially inner position with respect to the at least one carcass ply, and wherein the sealing material comprises the following characteristics: a value of a dynamic elastic modulus, measured at a temperature of 80�� C., at a frequency of 1 Hz, and with a deformation of 5%, that is at least 60% lower than the value of the dynamic elastic modulus measured at the temperature of 80�� C., at the frequency of 1 Hz, and with a deformation of 1%; and the value of the dynamic elastic modulus, measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 5%, that is greater than or equal to 0.05 kPa. 2. The tyre of claim 1, wherein the sealing material comprises the following characteristics: the value of the dynamic elastic modulus, measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 5%, that is at least 60% lower than the value of the dynamic elastic modulus measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 1%; and the value of the dynamic elastic modulus, measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 5%, that is greater than or equal to 0.1 kPa and less than or equal to 0.4 kPa. 3. The tyre of claim 1, wherein the at least one layer of sealing material is disposed between: the at least one carcass ply; and a first layer of elastomeric material disposed in a radially inner position with respect to the at least one carcass ply. 4. The tyre of claim 3, wherein a second layer of elastomeric material is disposed between the at least one layer of sealing material and the at least one carcass ply. 5. The tyre of claim 1, wherein the at least one layer of sealing material extends over a surface substantially corresponding to a surface of development of the tread. 6. The tyre of claim 1, wherein a strip of elastomeric material is placed along each axially outer edge of the at least one layer of sealing material. 7. The tyre of claim 1, wherein the at least one layer of sealing material comprises a thickness greater than or equal to 1.5 mm and less than or equal to 4.5 mm. 8. The tyre of claim 1, wherein the at least one thermally degradable polymer is selected from: homopolymers of at least one alpha-olefin comprising greater than or equal to 3 and less than or equal to 12 carbon atoms or its derivatives; and copolymers of at least one alpha-olefin comprising greater than or equal to 3 and less than or equal to 12 carbon atoms, with at least one olefin comprising one or more of ethylene, conjugated dienes comprising greater than or equal to 4 and less than or equal to 20 carbon atoms, and non-conjugated dienes comprising greater than or equal to 4 and less than or equal to 20 carbon atoms. 9. The tyre of claim 1, wherein the at least one thermally degradable polymer is selected from: polypropylene; butyl rubber; ethylene/propylene copolymers containing not more than 5% by weight of ethylene; and ethylene/propylene/diene terpolymers containing not more than 5% by weight of ethylene and not more than 5% by weight of diene. 10. The tyre of claim 1, wherein the at least one thermally degradable polymer comprises one or more butyl rubbers. 11. The tyre of claim 1, wherein the at least one reinforcing filler comprises one or more of carbon black, silica, alumina, aluminosilicates, calcium carbonate, and kaolin. 12. The tyre of claim 1, wherein the at least one reinforcing filler comprises carbon black. 13. The tyre of claim 1, wherein the at least one plasticizer comprises: one or more mineral oils; one or more vegetable oils; one or more synthetic oils; a mixture of one or more mineral oils and one or more vegetable oils; a mixture of one or more mineral oils and one or more synthetic oils; a mixture of one or more vegetable oils and one or more synthetic oils; or a mixture of one or more mineral oils, one or more vegetable oils, and one or more synthetic oils. 14. The tyre of claim 1, wherein the at least one plasticizer comprises aromatic oil. 15. The tyre of claim 1, wherein the at least one organic peroxide comprises one or more organic peroxides comprising a degradation temperature greater than 100�� C. 16. The tyre of claim 1, wherein the at least one organic peroxide comprises dicumyl peroxide. 17. A process for producing a tyre for a vehicle wheel, comprising: making at least one coating layer of cross-linkable elastomeric material on an outer surface of a toroidal support whose shape is essentially complementary to an inner surface of the tyre; making at least one layer consisting of a composition in a circumferentially outer position with respect to the at least one coating, wherein said composition comprises: 100 phr of at least one thermally degradable polymer; greater than or equal to 50 phr and less than or equal to 150 phr of at least one reinforcing filler; greater than or equal to 30 phr and less than or equal to 100 phr of at least one plasticizer; and greater than or equal to 10 phr of at least one organic peroxide: said at least one layer being; disposing a carcass structure comprising at least one carcass ply in a circumferentially outer position with respect to the at least one layer consisting of said composition comprising at least one thermally degradable polymer; disposing a belt structure in a circumferentially outer position with respect to the carcass structure; disposing a tread in a circumferentially outer position with respect to the belt structure; disposing at least one pair of sidewalls on the carcass structure in laterally opposite positions; subjecting the at least one coating layer, the at least one layer consisting of said composition comprising at least one thermally degradable polymer, the carcass structure, the belt structure, the tread, and the at least one pair of sidewalls to moulding in a cavity formed in a vulcanization mould; and subjecting the at least one coating layer, the at least one layer consisting of said composition comprising at least one thermally degradable polymer, the carcass structure, the belt structure, the tread, and the at least one pair of sidewalls to cross-linking by heating to a predetermined temperature and for a predetermined period of time; wherein, at an end of the cross-linking, said composition comprising at least one thermally degradable polymer comprises the following characteristics: a value of a dynamic elastic modulus, measured at a temperature of 80�� C., at a frequency of 1 Hz, and with a deformation of 5%, that is at least 60% lower than the value of the dynamic elastic modulus measured at the temperature of 80�� C., at the frequency of 1 Hz, and with a deformation of 1%; and the value of the dynamic elastic modulus, measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 5%, that is greater than or equal to 0.05 kPa. 18. The process of claim 17, wherein, at the end of the cross-linking, said composition comprising at least one thermally degradable polymer comprises the following characteristics: the value of the dynamic elastic modulus, measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 5%, that is at least 60% lower than the value of the dynamic elastic modulus measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 1%; and the value of the dynamic elastic modulus, measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 5%, that is greater than or equal to 0.1 kPa and less than or equal to 0.4 kPa. 19. The process of claim 17, wherein the cross-linking is carried out by heating the at least one coating layer, the at least one layer consisting of said composition comprising at least one thermally degradable polymer, the carcass structure, the belt structure, the tread, and the at least one pair of sidewalls to a temperature greater than or equal to 100�� C. and less than or equal to 250�� C. 20. The process of claim 17, wherein the at least one layer consisting of said composition comprising at least one thermally degradable polymer is obtained by winding at least one ribbon band consisting of said composition comprising at least one thermally degradable polymer in close coils along a cross-sectional profile of the toroidal support. 21. The process of claim 17, wherein the at least one thermally degradable polymer is selected from: homopolymers of at least one alpha-olefin comprising greater than or equal to 3 and less than or equal to 12 carbon atoms or its derivatives; and copolymers of at least one alpha-olefin comprising greater than or equal to 3 and less than or equal to 12 carbon atoms, with at least one olefin comprising one or more of ethylene, conjugated dienes comprising greater than or equal to 4 and less than or equal to 20 carbon atoms, and non-conjugated dienes comprising greater than or equal to 4 and less than or equal to 20 carbon atoms. 22. The process of claim 17, wherein the at least one thermally degradable polymer is selected from: polypropylene; butyl rubber; ethylene/propylene copolymers containing not more than 5% by weight of ethylene; and ethylene/propylene/diene terpolymers containing not more than 5% by weight of ethylene and not more than 5% by weight of diene. 23. The process of claim 17, wherein the at least one thermally degradable polymer comprises one or more butyl rubbers. 24. The process of claim 17, wherein the at least one reinforcing filler comprises one or more of carbon black, silica, alumina, aluminosilicates, calcium carbonate, and kaolin. 25. The process of claim 17, wherein the at least one reinforcing filler comprises carbon black. 26. The process of claim 17, wherein the at least one plasticizer comprises: one or more mineral oils; one or more vegetable oils; one or more synthetic oils; a mixture of one or more mineral oils and one or more vegetable oils; a mixture of one or more mineral oils and one or more synthetic oils; a mixture of one or more vegetable oils and one or more synthetic oils; or a mixture of one or more mineral oils, one or more vegetable oils, and one or more synthetic oils. 27. The process of claim 17, wherein the at least one plasticizer comprises aromatic oil. 28. The process of claim 17, wherein the at least one organic peroxide comprises one or more organic peroxides comprising a degradation temperature greater than 100�� C. 29. The process of claim 17, wherein the at least one organic peroxide comprises dicumyl peroxide. 30. A sealing material comprising: 100 phr of at least one thermally degradable polymer; greater than or equal to 50 phr and less than or equal to 150 phr of at least one reinforcing filler; greater than or equal to 30 phr and less than or equal to 100 phr of at least one plasticizer; and greater than or equal to 10 phr of at least one organic peroxide; wherein said sealing material comprises the following characteristics: a value of a dynamic elastic modulus, measured at a temperature of 80�� C., at a frequency of 1 Hz, and with a deformation of 5%, that is at least 60% lower than a value of the dynamic elastic modulus measured at the temperature of 80�� C., at the frequency of 1 Hz, and with a deformation of 1%; and the value of the dynamic elastic modulus, measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 5%, that is greater than or equal to 0.05 kPa. 31. The material of claim 30, comprising the following characteristics: the value of the dynamic elastic modulus, measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 5%, that is at least 60% lower than the value of the dynamic elastic modulus measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 1%; and the value of the dynamic elastic modulus, measured at the temperature of 80�� C., at the frequency of 1 Hz, and with the deformation of 5%, that is greater than or equal to 0.1 kPa and less than or equal to 0.4 kPa.
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이 특허에 인용된 특허 (7)
Farber Milton (Bethany CT) Loveless Frederick C. (Cheshire CT) Peterson ; Jr. Robert F. (Woodbury CT), Puncture sealing composition and tire.
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