Tread for an aircraft tire

Patent metadata

Field	Value
Publication number	US-11865866-B2
Application number	US-201917299475-A
Country	US
Kind code	B2
Filing date	Dec 2, 2019
Priority date	Dec 4, 2018
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

An aircraft tire comprises a tread (2), having an axial width L, which comprises a middle portion (3) having an axial width LC at least equal to 50% and at most equal to 80% of the axial width L of the tread and consisting of a middle rubber composition, and two lateral portions (41, 42), positioned axially on either side of the middle portion (3), each having an axial width (LS1, LS2) at least equal to 10% and at most equal to 25% of the axial width L of the tread and each consisting of a lateral rubber composition. The middle rubber composition comprises in particular from 25 to 85 phr of a tin-functionalized butadiene and styrene copolymer and from 15 to 75 phr of isoprene elastomer, and at least one lateral rubber composition is different from the middle rubber composition.

First claim

The invention claimed is:

1. An aircraft tire comprising a tread having an axial width L, the tread comprising:
a middle portion having an axial width L C at least equal to 50% and at most equal to 80% of the axial width L of the tread and consisting of a middle rubber composition; and
two lateral portions positioned axially on either side of the middle portion, each having an axial width (L S1 , L S2 ) at least equal to 10% and at most equal to 25% of the axial width L of the tread and each consisting of a lateral rubber composition,
wherein the middle rubber composition comprises at least one elastomeric matrix, a reinforcing filler and a crosslinking system, the elastomeric matrix comprising from 25 to 85 parts by weight per hundred parts by weight of elastomer, phr, of a tin-functionalized butadiene and styrene copolymer and from 15 to 75 phr of isoprene elastomer, a total content of isoprene elastomer and of butadiene and of tin-functionalized butadiene and styrene copolymer in the middle rubber composition being within a range extending from 45 to 100 phr,
wherein at least one lateral rubber composition is different from the middle rubber composition,
wherein the at least one lateral rubber composition comprises at least one diene elastomer, a reinforcing filler and a crosslinking system, in which the diene elastomer predominantly comprises at least one isoprene elastomer, and
wherein the at least one lateral rubber composition comprises more than 85 phr of the at least one isoprene elastomer.

2. The aircraft tire according to claim 1 , wherein the content of the isoprene elastomer in the middle rubber composition is within a range extending from 20 to 65 phr.

3. The aircraft tire according to claim 1 , wherein the content of tin-functionalized butadiene and styrene polymer in the middle rubber composition is within a range extending from 35 to 80 phr.

4. The aircraft tire according to claim 1 , wherein the elastomeric matrix of the middle rubber composition comprises more than 0 to 55 phr of another diene elastomer.

5. The aircraft tire according to claim 4 , wherein the other diene elastomer is selected from the group consisting of non-tin-functionalized butadiene and styrene copolymers, polybutadienes, and mixtures thereof.

6. The aircraft tire according to claim 1 , wherein the reinforcing filler of the middle rubber composition comprises carbon black, a reinforcing inorganic filler, or both carbon black and a reinforcing inorganic filler.

7. The aircraft tire according to claim 1 , wherein the content of reinforcing filler in the middle rubber composition is within a range extending from 20 to 100 phr.

8. The aircraft tire according to claim 1 , wherein the middle rubber composition also comprises from 1 to 30 phr of at least one hydrocarbon-based resin predominantly composed of units derived from aromatic and cycloaliphatic monomers.

9. The aircraft tire according to claim 8 , wherein the hydrocarbon-based resin predominantly composed of units derived from aromatic and cycloaliphatic monomers is such that the cycloaliphatic monomers are selected from the group consisting of cyclopentadiene, dicyclopentadiene and mixtures thereof, and the aromatic monomers are selected from the group consisting of styrene, alpha-methylstyrene, vinyltoluene, indene and mixtures thereof.

10. The aircraft tire according to claim 8 , wherein the hydrocarbon-based resin predominantly composed of units derived from aromatic and cycloaliphatic monomers has an aromatic proton content of between 0 and 12%, an ethylenic proton content greater than 3%, a number-average molecular weight greater than 500 g/mol and a polydispersity index greater than 2.

11. The aircraft tire according to claim 1 , wherein the lateral portion composition of each of the two lateral portions, positioned axially on either side of the middle portion, are different from the middle rubber composition.

12. The aircraft tire according to claim 1 , wherein the two lateral portions, positioned axially on either side of the middle portion, are formed by identical lateral rubber compositions.

13. The aircraft tire according to claim 1 , wherein the two lateral portions, positioned axially on either side of the middle portion, have identical axial widths (L S1 , L S2 ).

14. An aircraft tire comprising a tread having an axial width L, the tread comprising:
a middle portion having an axial width L C at least equal to 50% and at most equal to 80% of the axial width L of the tread and consisting of a middle rubber composition; and
two lateral portions positioned axially on either side of the middle portion, each having an axial width (L S1 , L S2 ) at least equal to 10% and at most equal to 25% of the axial width L of the tread and each consisting of a lateral rubber composition,
wherein the middle rubber composition comprises at least one elastomeric matrix, a reinforcing filler and a crosslinking system, the elastomeric matrix comprising from 25 to 85 parts by weight per hundred parts by weight of elastomer, phr, of a tin-functionalized butadiene and styrene copolymer and from 15 to 75 phr of isoprene elastomer, a total content of isoprene elastomer and of butadiene and of tin-functionalized butadiene and styrene copolymer in the middle rubber composition being within a range extending from 45 to 100 phr,
wherein at least one lateral rubber composition is different from the middle rubber composition,
wherein the middle rubber composition also comprises from 1 to 30 phr of at least one hydrocarbon-based resin predominantly composed of units derived from aromatic and cycloaliphatic monomers, and
wherein the hydrocarbon-based resin predominantly composed of units derived from aromatic and cycloaliphatic monomers has an aromatic proton content of between 0 and 12%, an ethylenic proton content greater than 3%, a number-average molecular weight greater than 500 g/mol and a polydispersity index greater than 2.

Assignees

• Michelin & Cie

Inventors

• Cabioch Jean-Luc
• Arnoux Michael

Classifications

• B60C11/0058 Primary

  with different cap rubber layers in the axial direction · CPC title

• B60C1/0016 Primary

  Compositions of the tread · CPC title

• C08K3/04

  Carbon · CPC title

• C08L9/06

  Copolymers with styrene · CPC title

• C08L15/00

  Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence) · CPC title