Abstract: A copolymer of ethylene and of isoprene, which comprises from 10 to 35 mol % of isoprene units, at least 70% of which are in the 3,4 configuration and a portion of which is in the 1,2 configuration is provided. A copolymer of this type with a reduced crystallinity is synthesized with a much higher productivity than its homologues of ethylene and of butadiene, and also confers improved curing properties on rubber compositions.

Abstract: A tire has an outer sidewall, said outer sidewall comprising a rubber composition based on at least one or more diene elastomers, an anti-ozone wax in a content of greater than 8 phr, a reinforcing filler in a content of between 30 and 75 phr, a plasticizer that is liquid at 23° C. in a content of between 5 and 40 phr, and a crosslinking system. This composition has the advantage of being highly resistant to external physical attacks.

Abstract: A tire whose tread consists totally or partly of a rubber composition which comprises at least 80 phr of a copolymer of ethylene and of a 1,3-diene which contains at least 70 mol % of ethylene units, between 25 phr and 55 phr of a carbon black, less than 1 phr of sulfur and a vulcanization accelerator is provided. The carbon black representing more than 60% by mass of the reinforcing filler of the rubber composition, the mass ratio between the sulfur content and the amount of vulcanization accelerator in the rubber composition being less than 1. The vulcanization accelerator is a primary accelerator or a mixture of a primary accelerator and of a secondary accelerator. Such a composition has good cohesion properties.

Abstract: A rubber composition which comprises at least 50 phr of a copolymer of ethylene and of a 1,3-diene which contains at least 50 mol % of ethylene units, a carbon black and a vulcanizing system comprising sulfur and a vulcanization accelerator which is a mixture of a primary accelerator and of a secondary accelerator is provided. The mass ratio between the amount of secondary accelerator and the total amount of accelerators is less than 0.7. Such a composition has a good compromise between the cohesion and curing properties.

Abstract: A copolymer of ethylene and of isoprene, which comprises from 10 to 35 mol % of isoprene units, at least 70% of which are in the 3,4 configuration and a portion of which is in the 1,2 configuration is provided. A copolymer of this type with a reduced crystallinity is synthesized with a much higher productivity than its homologues of ethylene and of butadiene, and also confers improved curing properties on rubber compositions.

Abstract: A tire tread comprising a rubber composition based on at least one highly saturated elastomer, a reinforcing filler and a vulcanization system is provided. The highly saturated diene elastomer contains 1,3-diene units and more than 50 mol % of ethylene units, the vulcanization system comprises a dithiosulfate salt of formula MO3S-S-A-S-SO3M in which the symbol A represents an alkanediyl group or a group comprising two or more alkanediyl units, which units are connected in pairs by means of an oxygen or sulfur atom, of a group of formula —SO2—, —NH—, —NH2+—, —N(C1—C16 alkyl)- or —COO—, or of an arylene or cycloalkylene group and the symbol M represents a metal atom. An improved compromise between the bubbling of the tread at the exit of curing presses and its hysteresis can be achieved.

Abstract: A tire has an outer sidewall, said outer sidewall comprising a rubber composition based on at least one or more diene elastomers, an anti-ozone wax in a content of greater than 8 phr, a reinforcing filler in a content of between 30 and 75 phr, a plasticizer that is liquid at 23° C. in a content of between 5 and 40 phr, and a crosslinking system. This composition has the advantage of being highly resistant to external physical attacks.

Abstract: A rubber composition based at least on an elastomer matrix, on a reinforcing filler and on a vulcanization system is provided. The elastomer matrix comprises a highly saturated elastomer and from 0 to less than 30 phr of natural rubber. The highly saturated diene elastomer contains 1,3-diene units and more than 50 mol % of ethylene units. The vulcanization system comprises a dithiosulfate salt of formula MO3S—S-A-S—SO3M in which the symbol A represents an alkanediyl group or a group comprising two or more alkanediyl units, which units are connected in pairs via an oxygen or sulfur atom, via a group of formula —SO2—, —NH—, —NH2+—, —N(C1-C16 alkyl)- or —COO—, or via an arylene or cycloalkylene group, and the symbol M represents a metal atom. The invention makes it possible to achieve an improved compromise between bubble formation in the rubber composition on exiting from the curing presses and its hysteresis.

Abstract: An elastomer laminate comprising three layers is provided. The first layer consists of a diene rubber composition comprising a first elastomer matrix, the second layer consists of a diene rubber composition comprising a second elastomer matrix, which second elastomer matrix comprises a second elastomer comprising ethylene units and diene units comprising a carbon-carbon double bond, which units are randomly distributed within the second elastomer, and the third layer consists of a diene rubber composition comprising a third diene elastomer having a content by weight of diene units of greater than 50% The second layer is arranged between the first layer and the third layer. Such a laminate has good resistance to separation of the layers which constitute it.

Abstract: The present invention relates to an aircraft tire, the tread of which comprises a rubber composition based on at least one first diene elastomer, a reinforcing filler and a crosslinking system, which first diene elastomer is a terpolymer of ethylene, of an ?-olefin and of a non-conjugated diene. Such a tire exhibits a performance on landing which is greatly improved, in particular with regard to the wear resistance at very high speeds.

Abstract: The present invention relates to an aircraft tire, the tread of which comprises a rubber composition based on at least one first diene elastomer, a reinforcing filler and a crosslinking system, which first diene elastomer comprises ethylene units and diene units comprising a carbon-carbon double bond, which units are distributed randomly within the first diene elastomer, the ethylene units representing at least 50 mol % of the combined monomer units of the first diene elastomer. Such a tire exhibits a performance on landing which is greatly improved, in particular with regard to the wear resistance at very high speeds.

Abstract: An airtight elastomeric laminate for tires comprises at least two superimposed layers of elastomer The first layer, includes at least a thermoplastic block elastomer comprising at least one central polyisobutylene block and adjacent blocks composed of at least one polymerized monomer, other than a styrene monomer, and on a plasticizing system. At least 5 phr of the thermoplastic elastomer present in the second layer are compatible with at least 5 phr of the thermoplastic block elastomer present in the first layer.

Abstract: An airtight elastomeric laminate for tires comprises at least two superimposed layers of elastomer. The first layer is composed of a composition based on at least one thermoplastic elastomer having polystyrene and polyisobutylene blocks, the content of thermoplastic elastomer having polystyrene and polyisobutylene blocks being within a range extending from more than 50 to 100 phr and on a plasticizing system comprising from 1 to 40 phr of a plasticizing oil and from 1 to 40 phr of a hydrocarbon resin, the total content of plasticizer being within a range extending from 2 to 70 phr. The second layer is composed of a composition based on at least one diene elastomer, the content of diene elastomer being within a range extending from more than 50 to 95 phr, and on at least one thermoplastic styrene elastomer in an amount ranging from 5 to less than 50 phr.

Abstract: An airtight elastomeric laminate for tires comprises at least two superimposed layers of elastomer. A first layer is composed of a composition based on at least one thermoplastic elastomer having polystyrene and polyisobutylene blocks, the content of thermoplastic elastomer having polystyrene and polyisobutylene blocks being within a range extending from more than 50 to 100 phr. A second layer is composed of a composition based on at least one diene elastomer, the content of diene elastomer being within a range extending from more than 50 to 95 phr, and on at least one thermoplastic styrene elastomer, the content of thermoplastic styrene elastomer being within a range extending from 5 to less than 50 phr.