Tread for a tire having a rigidity gradient.U.S. patent: 7,199,175 Issued: April 3, 2007 Inventor: Didier Vasseur Assigned: Michelin Recherche et Technique S.A. Key statement: A tire tread comprising a rubber composition based on (phr: parts by weight per hundred parts of elastomer elastomer (ĭlăs`təmər), substance having to some extent the elastic properties of natural rubber. The term is sometimes used technically to distinguish synthetic rubbers and rubberlike plastics from natural rubber. ): (i) a diene Dienes are hydrocarbons which contain two double bonds. Dienes are intermediate between alkenes and polyenes. Classes Dienes can be divided into three classes:
meth·yl·ene n. acceptor acceptor - Finite State Machine , and (v) between 0.5 and 5 phr of a methylene donor. This tread has, after mechanical running-in of the tire for which it is intended (auto-accommodation), a rigidity gradient which increases radially from the surface towards the inside of the tread. Such a tread is used for the manufacturing or recapping of tires. Tires comprising a tread according to the invention, in particular, are of the snow or ice type (winter tires). |
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