Bridgestone Corporation

Alessandra Calzetta

Raffaele Di Ronza

Gianluca Forte

Alessandra Bartoloni

A rubber compound for pneumatic tyres comprising a cross-linkable unsaturated-chain polymer base, carbon black, a silane bonding agent and a vulcanization system. Part of the carbon black is carbon black from pyrolysis having a surface functionalization deriving from a treatment with an aminoacidic compound comprising at least one thiol group or a disulfide group.

Rubber compounds for pneumatic tyres comprising recycled carbon black

A method of producing a rubber compound for a tread portion designed to assume, with use, a porous surface with a 75 to 800 &#x3bc;m pore area. The method includes a first mixing step, in which a polymer base, recycled rubber, and silica are mixed together; and a second mixing step, in which a curing system is added and mixed to the compound from the first mixing step. 5 to 20 phr of recycled rubber is added at the first mixing step. The recycled rubber is 75 to 800 um in size, and is treated beforehand cryogenically. And the polymer base is selected from SBR, BR, NR and mixtures thereof. The invention also relates to a rubber compound for producing a tread portion, a tread portion and a winter tire comprising said tread portion.

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Rome, Italy

Alessandra Calzetta