Abstract: A rubber composition comprises a reinforcing filler and a diene elastomer bearing imidazole functional groups along the chain which are randomly distributed along the chain. Such a composition exhibits an improved compromise in certain properties such as stiffness in the cured state and hysteresis.

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: The invention relates to a triblock diene elastomer, the central block of which is a polyether block having a number-average molecular weight ranging from 150 to 5000 g/mol and is connected via a silicon atom to each of the lateral blocks, and the chain ends of which are functionalized to at least 70 mol %, with respect to the number of moles of chain end, by an amine function.

Abstract: The present invention relates to a modified polymer obtained by grafting of a compound comprising at least one group Q and at least one group A, bonded together by at least, and preferably, one “spacer” group Sp in which: Q comprises a dipole containing at least, and preferably, one nitrogen atom, capable of being grafted onto the polymer chain by [1,3]-dipolar cycloaddition, A comprises an associative group comprising at least one nitrogen atom, Sp is an atom or a group of atoms forming a bond between Q and A.

Abstract: The invention relates to a rubber composition based on at least one diene elastomer, a reinforcing filler, a chemical crosslinker and a modifier selected from compounds comprising at least one group Q, and at least one group A, which are joined to one another by at least one and preferably one spacer group Sp, wherein: Q comprises a dipole containing at least one and preferably one nitrogen atom, A comprises an associative group comprising at least one nitrogen atom, Sp is an atom or group of atoms forming a bond between Q and A. This composition has an improved balance between stiffness under moderate deformations/elongation at break and improved hysteresis properties and is therefore especially suited to the manufacture of tires for enhancing the trade off between rolling resistance and resistance to large deformations.

Abstract: The invention relates to a modified diene elastomer comprising predominantly the entity functionalized in the middle of the chain by an alkoxysilane group, optionally partially or completely hydrolysed to give silanol, bearing a tertiary amine functional group and the silicon atom of which bonds the two pieces of the chain, the chain ends of the modified diene elastomer being functionalized to at least 70 mol %, with respect to the number of moles of chain end, by an amine functional group.

Abstract: The invention relates to a modified diene elastomer comprising predominantly the entity functionalized in the middle of the chain by a silanol group, the silicon atom of which bonds the two pieces of the chain, the chain ends of the modified diene elastomer being functionalized to at least 70 mol %, with respect to the number of moles of chain end, by an amine functional group.

Abstract: The invention relates to a tire comprising at least one rubber composition based on at least one diene elastomer, one reinforcing filler, one chemical crosslinking agent and one modifying agent, chosen from the compounds of following formula (I): where R denotes a unit comprising at least one reactive group, R1 denotes hydrogen, R2 denotes an alkylene radical comprising from 2 to 8 carbon atoms and optionally one or more heteroatoms chosen from S, N, O or Si, A denotes an oxygen or sulphur atom or an ?NH group, preferably an oxygen atom.

Abstract: A rubber composition for the manufacture of tires, based on one or more diene elastomers, on one or more reinforcing fillers and on a vulcanization system, characterized in that the said vulcanization system comprises one or more thiadiazole compounds of formula:

Abstract: A heavy-duty vehicle tire comprising a tread consisting of a crosslinked rubber composition comprising a reinforcing filler of siliceous type and a synthetic polyisoprene modified by grafting with a compound comprising at least one group Q, and at least one group A, which are joined to one another by at least one and preferably one “spacer” group Sp, in which: Q comprises a dipole containing at least one and preferably one nitrogen atom, A comprises an associative group comprising at least one nitrogen atom, Sp is an atom or group of atoms forming a bond between Q and A. The heavy-duty vehicle tire according to the invention has a satisfactorily improved rolling resistance/wear resistance compromise.

Abstract: The present invention relates to an elastomer mixture resulting from the modification of a diene elastomer by a coupling agent that introduces, into the elastomer chain, an alkoxysilane group bearing a tertiary or secondary amine functional group. This mixture predominantly comprises the diene elastomer coupled by the alkoxysilane group bearing a tertiary or secondary amine functional group which is bonded to the diene elastomer through the silicon atom. The invention also relates to a reinforced rubber composition, in particular that can be used for the manufacture of tires, which comprises a reinforcing filler and an elastomer matrix comprising at least this elastomer mixture, and to its preparation process. This composition has improved hysteresis and mechanical properties in the vulcanized state, and also improved processing in the uncured state.

Abstract: A process for the radical grafting of a graft to a diene elastomer, comprising the following stages: a. dissolving, with stirring, at least one diene elastomer and at least one thiol derivative as graft in a solvent comprising a mixture of at least one polar solvent and at least one nonpolar solvent, b. heating the homogeneous reaction mixture obtained in the preceding stage to the temperature of the grafting reaction, and c. once the temperature of the grafting reaction has been reached, adding the radical initiator in order to bring about the grafting of the graft to the units of the elastomer comprising unsaturations. This radical grafting process makes it possible to achieve high grafting yields which can reach 100%.

Abstract: The present invention relates to a process for the preparation of a random copolymer based on diene monomers and on cyclic carbosilane monomers. This process is characterized in that it comprises a stage of copolymerization, in the presence of an anionic initiator in a reaction medium comprising a polar solvent, of at least one diene monomer and of a cyclic carbosilane monomer corresponding to the Formula I: in which: R1 and R2, which are identical or different, are each a C1-C5 alkyl, C6-C14 aryl or C7-C11 alkylaromatic group; R3 and R4, which are identical or different, are each a hydrogen atom or a C1-C5 alkyl, C6-C14 aryl or C7-C11 alkylaromatic group; and x is an integer with a value ranging from 2 to 5 and is preferably 3.

Abstract: A thiadiazole of formula (I):

Abstract: The present invention relates to nitrogenous associative molecules comprising at least one unit rendering them capable of associating with one another or with a filler by noncovalent bonds, and comprising a function capable of reacting with a polymer containing unsaturations so as to form a covalent bond with said polymer.

Abstract: A compound includes at least one group Q and at least one group A linked together by at least one “spacer” group Sp, in which: group Q includes a dipole containing at least one nitrogen atom, preferably a nitrile oxide, nitrone, or nitrile imine function; group A contains at least one nitrogen atom, and is preferably an imidazolidinyl, ureyl, bis-ureyl, ureido-pyrimidyl, and triazolyl group; and Sp is an atom or a group of atoms forming a link between Q and A, preferably, a linear, branched or cyclic hydrocarbon-based optionally substituted chain, and may contain one or more aromatic radicals and/or heteroatoms. The compound may react with an unsaturated polymer forming a covalent bond with the polymer. The compound is useful for providing good interaction between fillers and polymers by establishing labile, non-covalent bonds between the polymer chains and the filler, thereby limiting processing problems.

Abstract: A rubber composition for manufacturing tyres is based on one or more diene elastomers, one or more reinforcing fillers, and a vulcanization system. The vulcanization system includes one or more 1,2,4-triazine compounds chosen from compounds of formula I and compounds of formula II: Certain specific 1,2,4-triazine derivatives are described.

Abstract: A rubber composition for the manufacture of tires, based on a blend of at least one diene elastomer chosen from natural rubber and synthetic polyisoprene and of one or more diene elastomers chosen from the group consisting of polybutadienes, butadiene copolymers and isoprene copolymers, on one or more reinforcing fillers and on a vulcanization system, the said vulcanization system comprising one or more thiazoline compounds of formula:

Abstract: An organosilane of general formula I below: (HO)2R1Si—Z—Sm—R2 in which: R1, which are identical or different, each represent a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 18 carbon atoms; R2 represents a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 30 carbon atoms; Z represents a divalent bonding group comprising from 1 to 18 carbon atoms; and m is a number greater than or equal to 2.

Abstract: A rubber composition that can be used for the manufacture of tires, based on at least one diene elastomer; one sulphur-based crosslinking system; one inorganic filler as reinforcing filler; one coupling agent of general formula I below: (HO)3-nR1nSi—Z—Sm—R2 wherein in which: R1, which are identical or different, each represent a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 18 carbon atoms; R2 represents a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 30 carbon atoms; Z represents a divalent bonding group comprising from 1 to 18 carbon atoms; n is an integer equal to 0, 1 or 2; and m is a number greater than or equal to 2.