Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Olivia Cuscito

Jose Merino Lopez

Frédéric Pialot

Didier Vasseur

José Merino Lopez

Damien Thomasson

Sylvain Petitjean

Sylvain Petit Jean

Yu Shiraishi

Salvatore Pagano

A rubber composition is based on at least an elastomer, a reinforcing filler, a crosslinking system and a crumb rubber, the said crumb exhibiting: an acetone extract of between 8% and 50% by weight; a chloroform extract such that the ratio of the chloroform extract to the acetone extract, expressed as percentage by weight, is less than 1.5, the chloroform extract exhibiting a weight-average molecular weight (Mw) of less than 10000 g/mol; and a content of plasticizer of greater than 8% by weight in the composition of the crumb.

Rubber composition comprising a specific crumb rubber

A rubber composition is based on at least an elastomer, a reinforcing filler and a crosslinking system and a crumb rubber, said crumb having a particle size distribution such that it comprises less than 35% by weight of particles having a size of less than 50 &#x3bc;m and less than 30% by weight of particles having a size of greater than 200 &#x3bc;m.

A rubber composition is based on at least an elastomer, a reinforcing filler, a crosslinking system and a crumb rubber, the said crumb exhibiting a content of isoprene elastomer of greater than 80 phr in the composition of the crumb and the crumb rubber exhibiting a fraction by weight of carbon black ranging from 31% to 35%.

A rubber composition is based on at least an elastomer, a reinforcing filler, a crosslinking system and a crumb rubber, in which the crumb exhibits a content of sulfur and a content of accelerator such that their sum is less than or equal to 5 parts by weight per 100 parts by weight of elastomer (phr), the said crumb exhibiting a total sulfur content of less than or equal to 4 parts by weight per 100 parts by weight of elastomer (phr) in the composition of the crumb.

A rubber composition is based on at least an elastomer, a reinforcing filler and a crosslinking system and a crumb rubber, said crumb having an isoprene elastomer content of greater than 50 phr in the composition of the crumb and a chloroform extract with a weight-average molecular weight of less than 10 000 g/mol.

The tire (B) comprises a tread () including a running layer () which is intended to come into contact with the ground when the tire (B) rolls on the ground, and a sublayer () located radially inwards from the running layer (). The tread () comprises at least one fluid passage () between the sublayer () and the air surrounding the tire (B). The sublayer () comprises a cellular material. The fluid passage () comprises an element chosen from a groove () and a cut (), formed in the running layer () and extended by at least one well () acting as a radial extension of the element, formed between the groove () and/or the cut () and the sublayer (). Each well () forms a localized part of the fluid passage ().

Tire and mold comprising a fluidic passage

A layer of cellular material forms a running layer (A) of a tread () in which tread pattern elements () are made. In order to form the cellular material, an uncured blank is provided with a mass of material comprising p,p'-oxybis(benzenesulphonyl hydrazide) that forms a pore-forming agent. The uncured blank is placed in a vulcanization mold () comprising molding elements (). At least 95% of the molding elements () each satisfy the following two conditions:

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Clermont-Ferrand, France

Olivia Cuscito