Abstract: A resin-extended elastomer comprises an elastomer which is a synthetic diene elastomer with a number-average molar mass of greater than or equal to 200,000 g/mol and a resin which is a plasticizing hydrocarbon-based resin. A process for obtaining such a resin-extended elastomer and compositions, semi-finished products for tires and tires containing same are also disclosed.

Abstract: A process for preparing a random copolymer based on at least one acyclic diene monomers and on at least one cyclic diene monomer is provided. The process comprises a step of copolymerization, in the presence of a polar agent and an anionic initiator in a polymerization solvent, of at least one acyclic diene monomer and of at least one cyclic diene monomer of which one C?C double bond is endocyclic and conjugated to an exocyclic C?C double bond, at a polymerization temperature below 80° C. A molar ratio of the polar agent/function(s) of the anionic initiator capable of initiating anionic polymerization being greater than 0.1. Copolymers based on at least one acyclic diene monomer and on at least one cyclic diene monomer and the compositions containing them are also provided.

Abstract: A rubber composition based on a reinforcing filler and on an elastomer comprising units of a 1,3-diene monomer and bearing carbonate functions, each present in a 1,3-dioxolan-2-one ring is provided. The composition has improved reinforcement.

Abstract: A method for synthesizing a thermoplastic elastomer comprising at least one polydiene block and at least one other poly(?-methylstyrene) block comprises: polymerizing at least one diene monomer in a starting reaction medium comprising an anionic polymerization initiator and an aprotic non-polar solvent; polymerizing ?-methylstyrene to the living polydiene chain obtained in the preceding step comprising: maintaining the reaction medium containing the living diene elastomer obtained previously and ?-methylstyrene at a positive temperature, below the ceiling temperature for the polymerization of ?-methylstyrene; cooling the reaction medium obtained at the end of step a., to a temperature below 0° C.; simultaneously, successively or prior to the cooling step, adding a purified aprotic polar solvent to the reaction medium with a volume ratio of the polar solvent to the non-polar solvent of less than 1; and propagating the polymerization of ?-methylstyrene to the living polydiene chain.

Abstract: A process for synthesizing a polymer bearing at least one phosphonate group in the polymer chain is provided. The process comprises at least the reaction of a starting polymer bearing at least one nucleophilic function in the polymer chain with at least one electrophilic compound bearing both a phosphonate group and an electrophilic function. The electrophilic function is selected from the halide function, the acyl halide function, the ester function, the carboxylic acid function and the isocyanate function.

Abstract: A resin-extended elastomer comprises an elastomer which is a synthetic diene elastomer with a number-average molar mass of greater than or equal to 200,000 g/mol and a resin which is a plasticizing hydrocarbon-based resin. A process for obtaining such a resin-extended elastomer and compositions, semi-finished products for tires and tires containing same are also disclosed.

Abstract: A process for preparing a random copolymer based on at least one acyclic diene monomers and on at least one cyclic diene monomer is provided. The process comprises a step of copolymerization, in the presence of a polar agent and an anionic initiator in a polymerization solvent, of at least one acyclic diene monomer and of at least one cyclic diene monomer of which one C?C double bond is endocyclic and conjugated to an exocyclic C?C double bond, at a polymerization temperature below 80° C. A molar ratio of the polar agent/function(s) of the anionic initiator capable of initiating anionic polymrization being greater than 0.1. Copolymers based on at least one acyclic diene monomer and on at least one cyclic diene monomer and the compositions containing them are also provided.

Abstract: A process for the synthesis of a diene copolymer comprising at least two blocks, at least one of the blocks being composed of a diene elastomer, characterized in that it comprises a stage of 1,3-dipolar reaction of two polymers defined as being: a) a diene elastomer bearing an alkyne functional group at one or each of its chain ends, and b) a polymer bearing at least one azide functional group. This process of synthesis can be adjusted, whatever the nature of the monomers necessary to form each of the blocks of the copolymer. Each block can be synthesized with an appropriate chemistry, independently of the other block.

Abstract: A rubber composition based on a reinforcing filler and on an elastomer comprising units of a 1,3-diene monomer and bearing carbonate functions, each present in a 1,3-dioxolan-2-one ring is provided. The composition has improved reinforcement.

Abstract: The invention relates to a process for the synthesis of a polymer bearing one or more pendant hydroxyaryl groups, comprising the reaction of a polymer bearing at least one epoxide functional group with a nucleophilic compound simultaneously bearing the hydroxyaryl group and a nucleophilic functional group selected from the group consisting of the phosphonic acid functional group and its ionic form.

Abstract: A method for synthesizing a thermoplastic elastomer comprising at least one polydiene block and at least one other poly(?-methylstyrene) block comprises: polymerizing at least one diene monomer in a starting reaction medium comprising an anionic polymerization initiator and an aprotic non-polar solvent; polymerizing ?-methylstyrene to the living polydiene chain obtained in the preceding step comprising: maintaining the reaction medium containing the living diene elastomer obtained previously and ?-methylstyrene at a positive temperature, below the ceiling temperature for the polymerization of ?-methylstyrene; cooling the reaction medium obtained at the end of step a., to a temperature below 0° C.; simultaneously, successively or prior to the cooling step, adding a purified aprotic polar solvent to the reaction medium with a volume ratio of the polar solvent to the non-polar solvent of less than 1; and propagating the polymerization of ?-methylstyrene to the living polydiene chain.

Abstract: A process for synthesizing a polymer bearing at least one phosphonate group in the polymer chain is provided. The process comprises at least the reaction of a starting polymer bearing at least one nucleophilic function in the polymer chain with at least one electrophilic compound bearing both a phosphonate group and an electrophilic function. The electrophilic function is selected from the halide function, the acyl halide function, the ester function, the carboxylic acid function and the isocyanate function.

Abstract: A method for synthesizing a modified polymer comprising epoxide groups along the polymer chain, by a hydrosilylation reaction of the unsaturations with a hydrosilane bearing an epoxide function in the presence of a suitable catalyst is provided. The method is simple, reproducible and able to be used on an industrial scale, and makes it possible to obtain high grafting yields, since they may reach 100%.

Abstract: The invention relates to a process for the synthesis of a polymer bearing one or more pendant hydroxyaryl groups, comprising the reaction of a polymer bearing at least one epoxide functional group with a nucleophilic compound simultaneously bearing the hydroxyaryl group and a nucleophilic functional group selected from the group consisting of the phosphonic acid functional group and its ionic form.

Abstract: A process for synthesizing a copolymer bearing imidazole pendant groups is provided. The process comprises the radical copolymerization of a monomer mixture comprising a terminal olefin and a functional monomer bearing a (meth)acryloyl group and an imidazole group.

Abstract: Compositions comprising phosphonate-functionalized polyene copolymers and a reinforcing filler, in particular rubber compositions, and to their uses is provided. This phosphonate-functionalized polyene copolymer comprises, in its main linear chain, unsaturated units resulting from at least one conjugated polyene monomer and units substituted by a —C(O)O-A-P(O)OR1OR2 functional group, in which R1 and R2, which are identical or different, each represent H or a C1-C6 alkyl and A represents a (C1-C6)alkylene radical or a (C1-C5)alkylene radical containing at least one heteroatom. The use of this copolymer in a tire composition additionally comprising a diene elastomer and a reinforcing filler, for improving the interactions between the filler and the diene elastomer included in the said tire composition is also provided.

Abstract: The invention relates to a process for the synthesis of a polymer bearing one or more pendant hydroxyaryl groups comprising the reaction of a polymer bearing one or more pendant epoxide functional groups with a nucleophilic compound bearing the hydroxyaryl group.

Abstract: The invention relates to a novel polyphosphorus-based chain-end thiol-functionalized polymer, the polymer chain of which comprises units bearing at least one pendant phosphonate function and/or at least one pendant phosphonic function along the chain. This novel polymer is quite particularly suited to participating in a thiol-ene coupling reaction, which affords the possibility of grafting the polyphosphorus-based polymers onto diene polymers, for example.

Abstract: A rubber composition based on a reinforcing filler, an elastomer matrix that is reactive with respect to the crosslinking system, wherein the elastomer matrix comprises an elastomer A comprising monomer units of a first methacrylic acid ester which represent at least 20 mol % of the monomer units of the elastomer A, and a crosslinking system is provided. The rubber composition makes it possible to improve the wet grip of tires whose tread consists of the rubber composition.

Abstract: The invention relates to a method for the synthesis of a novel diene polymer with a high content of phosphorus-based functions by radical grafting of a polyphosphorus-based polymer bearing a chain-end thiol function onto a diene polymer according to the following steps: a) bringing together, with stirring, at least one diene polymer in solution and at least one polyphosphorus-based polymer bearing a chain-end thiol function in solution, b) heating the homogeneous reaction mixture obtained in the previous step to the grafting reaction temperature, and c) adding the radical initiator concomitantly with either of steps a) and b) or once the grafting reaction temperature has been reached.