Patent ID: 11865866
Assignee: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 13:
14. An aircraft tire comprising a tread having an axial width L, the tread comprising:
a middle portion 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 positioned axially on either side of the middle portion, 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,
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.