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.

In at least one embodiment, a process of forming a polymer includes supplying a feed having one or more olefin monomers and a solvent; contacting the feed with a catalyst to form a reaction mixture; treating the reaction mixture in a first separator to form a first polymer-rich mixture; introducing the first polymer-rich mixture into a second separator; introducing a volatile component and/or inert component into the first separator, the second separator and/or a line between the first separator and the second separator; treating the first polymer-rich mixture to form a second polymer-rich mixture; and devolatilizing the second polymer-rich mixture to obtain the polymer.

In at least one embodiment, a process of forming a polymer includes supplying a feed having one or more olefin monomers and a solvent; contacting the feed with a catalyst to form a reaction mixture; treating the reaction mixture in a first separator to form a first polymer-rich mixture; introducing the first polymer-rich mixture into a second separator; introducing a volatile component and/or inert component into the first separator, the second separator and/or a line between the first separator and the second separator; treating the first polymer-rich mixture to form a second polymer-rich mixture; and devolatilizing the second polymer-rich mixture to obtain the polymer.

A tire comprises a rubber composition based on at least one elastomeric matrix mainly comprising a random copolymer comprising ethylene units and conjugated diene units, the mole fraction of the ethylene units in the copolymer being within a range extending from 50% to 95%; a peroxide; and a specific acrylate derivative.

The present invention relates to a rubber composition based on a reinforcing filler and on an elastomer matrix comprising a highly saturated diene elastomer comprising at least five distinct units of A, B, C, D and E distributed randomly within the elastomer at respective molar fractions of m %, n %, o %, p % and q %, where m+n+o+p+q=100; m50; n+o+p+q10; and 15p+q2. This rubber composition enables a satisfactory degree of stiffness to be reached while maintaining hysteresis properties acceptable for use in the manufacture of tires for running vehicles.

A rubber composition is based on at least an elastomer matrix predominantly comprising a highly saturated diene elastomer, carbon black and a tall oil ester plasticizer, the highly saturated diene elastomer being a copolymer of ethylene and a 1,3-diene in which the ethylene units represent at least 50 mol % of the monomer units of the copolymer.

A rubber composition is based on at least an elastomer matrix predominantly comprising a highly saturated diene elastomer, carbon black and a tall oil ester plasticizer, the highly saturated diene elastomer being a copolymer of ethylene and a 1,3-diene in which the ethylene units represent at least 50 mol % of the monomer units of the copolymer.

The invention relates to a rubber composition which comprises a reinforcing filler, a crosslinking system and more than 50 to 100 phr of an elastomer which is a copolymer of ethylene and of a 1,3-diene CH.sub.2?CRCH?CH.sub.2, the symbol R representing a hydrocarbon chain having from 3 to 20 carbon atoms. The rubber composition has a good compromise between the stiffness and hysteresis properties.

A thermoplastic elastomer composition contains components (A), (B), (C), and (D), wherein the weight ratio of component (C) to component (D) is 0.1 and <2, component (A) is an ethylene random copolymer containing 50% and 90% of a monomer unit derived from ethylene by weight relative to the component (A) and a monomer unit derived from at least one monomer selected from the group consisting of -olefins having a number of carbon atoms of 3 and 10, component (B) is a polymer containing >50% and 100% of a monomer unit derived from propylene by weight relative to the component (B), component (C) is a copolymer containing an ethylene polymerization block and an ethylene--olefin copolymerization block, and component (D) is an ethylene polymer containing >90% and 100% of a monomer unit derived from ethylene by weight relative to the component (D).

A thermoplastic elastomer composition contains components (A), (B), (C), and (D), wherein the weight ratio of component (C) to component (D) is 0.1 and <2, component (A) is an ethylene random copolymer containing 50% and 90% of a monomer unit derived from ethylene by weight relative to the component (A) and a monomer unit derived from at least one monomer selected from the group consisting of -olefins having a number of carbon atoms of 3 and 10, component (B) is a polymer containing >50% and 100% of a monomer unit derived from propylene by weight relative to the component (B), component (C) is a copolymer containing an ethylene polymerization block and an ethylene--olefin copolymerization block, and component (D) is an ethylene polymer containing >90% and 100% of a monomer unit derived from ethylene by weight relative to the component (D).