Tread comprising relief elements covered by a specific mixture

Resilient tires and wheels – Tires – resilient – Anti-skid devices

Reexamination Certificate

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Details

C152S209180, C152S905000

Reexamination Certificate

active

07987881

ABSTRACT:
A tire tread comprising a plurality of elements in relief (1) comprising a contact face (2) intended to come into contact with the roadway during travel and lateral faces (13, 14, 15, 16), the intersection of each lateral face with the contact face forming a ridge (23, 24, 25, 26). The tire tread also comprises a plurality of cutouts (3, 4) in the form of grooves and/or incisions, said cutouts being defined by facing main faces. Each tread pattern element (1) is formed with at least one rubber mix (referred to as “base mix”). This tread, viewed in section in a plane containing the thickness of this tread, has at least one face defining at least one cutout covered at least in part with a second rubber mix, referred to as “covering mix”, this part having covering mix extending when new over a height Hr at least equal to 30% of the height H of the face, and wherein at least one first base mix opens on to the contact face when new or at the latest after wear at most equal to 10% of the height Hr. The covering mix comprises a butyl rubber and the covering mix comprises a plasticiser of the type unsaturated C12-C22fatty acid ester.

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