Abstract: The invention relates to an elastomer composition for heavy-duty tyres based on at least one elastomeric matrix, fillers including graphite and a reinforcing filler, and a vulcanization system, characterized in that: the elastomeric matrix comprises at least 50 phr of a diene elastomer chosen from the group consisting of isoprene elastomers, butadiene elastomers and mixtures of these diene elastomers, the reinforcing filler predominantly comprises a carbon black, the graphite has a crystallite size Lc in a range from 80 to 500 nm, more preferentially from 90 to 400 nm, more preferentially from 100 to 300 nm, the total filler content is less than or equal to 65 phr.

Abstract: The invention relates to an elastomer composition for heavy-duty tyres based on at least one elastomeric matrix, fillers including graphite and a reinforcing filler, and a vulcanization system, characterized in that: the elastomeric matrix comprises at least 50 phr of a diene elastomer chosen from the group consisting of isoprene elastomers, butadiene elastomers and mixtures of these diene elastomers, the reinforcing filler predominantly comprises an acetylene black, the graphite has a crystallite size Lc in a range from 80 to 500 nm, more preferentially from 90 to 400 nm, more preferentially from 100 to 300 nm, the total filler content is less than or equal to 65 phr.

Abstract: A rubber compound has at least two glass transition temperatures Tg1 and Tg2, based on at least one vulcanization system and at least two rubber compositions C1 and C2, the composition C1 comprising at least one elastomer E1 and having a Tg1, the composition C2 comprising at least one elastomer E2 different from E1, and a reinforcing filler, and the composition C2 having a Tg2, in which: Tg1??50° C.; the rubber compound satisfies Tg1-Tg2?23° C.; the rubber compound has a loss factor profile which is such that all the tan ? peaks present at a temperature above the temperature Tg1 have a width at half height of ?23° C.; E1 is predominant in the rubber compound; E2 is an isoprene diene elastomer; and the vulcanization system comprises at least one vulcanization accelerator A selected from thiurams, dithiocarbamates, dithiophosphates, xanthates and mixtures thereof.

Abstract: The invention relates to a method for the production of composite fibers with an increased content of colloidal particles, made from a pre-fiber, comprising a polymeric binder and colloidal particles, during which the chemical structure of the polymeric binder is degraded at a temperature of the order of ambient temperature such as to at least partially eliminate the above. The invention further relates to a fiber comprising a polymeric binder and colloidal particles, combining an excellent mechanical strength and a content of colloidal particles greater than 70% by mass.

Abstract: The invention relates to a method for the production of composite fibres with an increased content of colloidal particles, made from a pre-fibre, comprising a polymeric binder and colloidal particles, during which the chemical structure of said polymeric binder is degraded at a temperature of the order of ambient temperature such as to at least partially eliminate the above. The invention further relates to a fibre comprising a polymeric binder and colloidal particles, combining an excellent mechanical strength and a content of colloidal particles greater than 70% by mass.