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: The present invention relates to a process for the continuous preparation of a catalytic system that can be used for the polymerization of at least one conjugated diene monomer, said catalytic system being based on at least: a preforming conjugated diene; an organic phosphoric acid salt of one or more rare-earth metal(s), said salt being in suspension in at least one saturated aliphatic or alicyclic and inert hydrocarbon-based solvent; an alkylating agent comprising an alkylaluminium having the formula AlR3 or HAlR2; and a halogen donor comprising an alkylaluminium halide; characterized in that it comprises successively in one line (L): (i) a reaction between the preforming conjugated diene, with the solution of the salt of rare-earth element(s) and the alkylating agent, with the alkylation reaction being carried out for a characteristic minimum period of at least 5 minutes in an alkylation reactor (30) composed of at least one well-mixed dynamic mixer; (ii) the addition of said halogen donor to the mixtur

Abstract: The present invention relates to a process for preparing a diene elastomer. The invention especially applies to the production of a polybutadiene with a high level of cis-1,4 linkages that has at the same time a Mooney viscosity ML (1+4) greater than or equal to 40, a polydispersity index less than 2.1 and a reduced cold flow and of a polyisoprene. The process according to the invention comprises a reaction of a catalyst system with at least one conjugated diene monomer, this catalyst system being based on at least: one conjugated diene; one organic phosphoric acid salt of one or more rare-earth metals, said salt being in suspension and in at least one saturated and aliphatic or alicyclic, and inert hydrocarbon-based solvent; one alkylating agent composed of an alkyl aluminum for formula AlR3 or HAlR2 and a halogen donor belonging to the family of alkylaluminium halides, with the exclusion of alkylaluminium sesquihalides.

Abstract: A process for preparing, in one step, a diene block copolymer, of which at least one of these blocks is constituted of a polyether, the number-average molecular weight of which is approximately from 100 to 5000 g/mol, and at least one other of these blocks is constituted of a diene elastomer. The process according to the invention allows a high degree of grafting of the polyether to the polymer chains. Also disclosed is a reinforced rubber composition, especially intended for the manufacture of tires, comprising such a block copolymer which is intended to interact with the reinforcing filler. Such a rubber composition has improved hysteresis properties in the vulcanized state, while retaining satisfactory processing properties in the non-vulcanized state.

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 tyres, 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 preparing, in one step, a diene block copolymer, of which at least one of these blocks is constituted of a polyether, the number-average molecular weight of which is approximately from 100 to 5000 g/mol, and at least one other of these blocks is constituted of a diene elastomer. The process according to the invention allows a high degree of grafting of the polyether to the polymer chains. Also disclosed is a reinforced rubber composition, especially intended for the manufacture of tires, comprising such a block copolymer which is intended to interact with the reinforcing filler. Such a rubber composition has improved hysteresis properties in the vulcanized state, while retaining satisfactory processing properties in the non-vulcanized state.

Abstract: A rubber composition usable for manufacturing a metal/rubber composite and capable of adhering to a metallic reinforcing member, comprising at least one diene elastomer, a reinforcing filler, a cross-linking system and between 0.1 and 10 phr of acetylacetonate of a lanthanide.

Abstract: The present invention relates to a process for preparing a diene elastomer. The invention especially applies to the production of a polybutadiene with a high level of cis-1,4 linkages that has at the same time a Mooney viscosity ML (1+4) greater than or equal to 40, a polydispersity index less than 2.1 and a reduced cold flow and of a polyisoprene. The process according to the invention comprises a reaction of a catalyst system with at least one conjugated diene monomer, this catalyst system being based on at least: one conjugated diene; one organic phosphoric acid salt of one or more rare-earth metals, said salt being in suspension and in at least one saturated and aliphatic or alicyclic, and inert hydrocarbon-based solvent; one alkylating agent composed of an alkyl aluminium for formula AlR3 or HAlR2 and a halogen donor belonging to the family of alkylaluminium halides, with the exclusion of alkylaluminium sesquihalides.

Abstract: The present invention relates to a process for the continuous preparation of a catalytic system that can be used for the polymerization of at least one conjugated diene monomer, said catalytic system being based on at least: a preforming conjugated diene; an organic phosphoric acid salt of one or more rare-earth metal(s), said salt being in suspension in at least one saturated aliphatic or alicyclic and inert hydrocarbon-based solvent; an alkylating agent comprising an alkylaluminium having the formula AlR3 or HAlR2; and a halogen donor comprising an alkylaluminium halide; characterized in that it comprises successively in one line (L): (i) a reaction between the preforming conjugated diene, with the solution of the salt of rare-earth element(s) and the alkylating agent, with the alkylation reaction being carried out for a characteristic minimum period of at least 5 minutes in an alkylation reactor (30) composed of at least one well-mixed dynamic mixer; (ii) the addition of said halogen donor to the mixtur

Abstract: A process is described for obtaining a 1,3-butadiene homopolymer by the reaction of a catalytic system in the presence of 1,3-butadiene and one or more monoolefin(s) with 4 carbon atoms. This catalytic system is based on at least: a conjugated diene monomer, an organic phosphoric acid salt of one or more rare earth metals, said salt being in suspension in at least one inert, saturated and aliphatic or alicyclic hydrocarbon solvent, an alkylating agent of the formula AlR3 or HAlR2, where R is an alkyl group, and an alkylaluminum halide halogen donor.

Abstract: The present invention relates to a cross-linkable or cross-linked rubber composition having improved hysteresis properties in the cross-linked state which is useful for the manufacture of treads for tires. The rubber composition of the present invention comprises at least one diene elastomer having a molar ratio of units originating from conjugated dienes which is greater than 30% and comprising carboxylic acid functions along its chain, and a reinforcing inorganic filler. The present invention further relates to a process for preparing such a cross-linkable or cross-linked rubber composition as well as to a tire having reduced rolling resistance and a tread for a tire where the tread comprises the rubber composition of the present invention.

Abstract: Rubber composition usable for the manufacture of metallic rubberised fabrics and capable of adhering to a metallic reinforcing member, comprising a diene elastomer, a reinforcing filler, a cross-linking system and an adhesion promoter, said adhesion promoter comprising at least one lanthanide compound, preferably an organolanthanide. Metal/rubber composite comprising such a composition and its use for the manufacture or the reinforcement of ground contact systems of motor vehicles such as tires. Ground contact systems and semi-finished rubber products, in particular tires, comprising such a composite. The lanthanide compound imparts to the composition and to the composite improved adhesive properties after thermal ageing, in particular in humid conditions. It may be used alone or in combination with a cobalt compound, in particular in carcass or crown reinforcements of passenger-vehicle or heavy-vehicle tires.

Abstract: Branched synthetic polyisoprenes are described having a macrostructure and a microstructure very similar to those of natural rubber. According to one aspect, these polyisoprenes have an apparent stress F/S0 greater than or equal to 0.4 MPa at a relative elongation ? of 150%, applied to a dumbbell-shaped test specimen consisting of the crosslinkable polyisoprene. According to another aspect, these polyisoprenes fulfill the relationship: Cotan ??0.3761. ?inh+0.15,:??(i) where cotan ? is the cotangent of the loss angle of a sample of said polyisoprene, measured at 130° C. by means of an instrument known by the trade name “RPA2000”, said sample being subjected to shear stress to 10% deformation and at a stress frequency of 0.035 Hz, and where ?inh is the inherent viscosity of said polyisoprene, measured in toluene at 25° C. and at a concentration of said polyisoprene in toluene of 0.1 g/dl.

Abstract: The present invention relates to a catalytic system usable for the preparation of polybutadienes by polymerisation, to a process for the preparation of said catalytic system and to a process for the preparation of polybutadienes by means of this catalytic system. A catalytic system according to the invention is based on at least: a conjugated diene monomer, an organic phosphoric acid salt of one or more rare earth metals, said salt being in suspension in at least one inert, saturated and aliphatic or alicyclic hydrocarbon solvent, an alkylating agent consisting of an alkylaluminium of formula AlR3 or HAlR2, the “alkylating agent:rare earth salt” molar ratio being greater than 5, and a halogen donor which belongs to the family of alkylaluminium halides with the exception of alkylaluminium sesquihalides, and, according to the invention, said catalytic system comprises said rare earth metal(s) in a concentration equal to or greater than 0.005 mol/l.

Abstract: A process is described for obtaining a 1,3-butadiene homopolymer by the reaction of a catalytic system in the presence of 1,3-butadiene and one or more monoolefin(s) with 4 carbon atoms. This catalytic system is based on at least: a conjugated diene monomer, an organic phosphoric acid salt of one or more rare earth metals, said salt being in suspension in at least one inert, saturated and aliphatic or alicyclic hydrocarbon solvent, an alkylating agent of the formula AlR3 or HAlR2, where R is an alkyl group, and an alkylaluminum halide halogen donor.

Abstract: Branched synthetic polyisoprenes are described having a macrostructure and a microstructure very similar to those of natural rubber. According to one aspect, these polyisoprenes have an apparent stress F/S0 greater than or equal to 0.4 MPa at a relative elongation ? of 150%, applied to a dumbbell-shaped test specimen consisting of the crosslinkable polyisoprene. According to another aspect, these polyisoprenes fulfill the relationship: Cotan ??0.3761. ?inh+0.15, ??(i): where cotan ? is the cotangent of the loss angle of a sample of said polyisoprene, measured at 130° C. by means of an instrument known by the trade name “RPA2000”, said sample being subjected to shear stress to 10% deformation and at a stress frequency of 0.035 Hz, and where ?inh is the inherent viscosity of said polyisoprene, measured in toluene at 25° C. and at a concentration of said polyisoprene in toluene of 0.1 g/dl.

Abstract: The present invention relates to a solid supported catalyst usable for the polymerization of conjugated dienes, to a process for the preparation of said catalyst and to a process for the polymerization of conjugated dienes using said catalyst. The solid supported catalyst according to the invention comprises the reaction product of a) a complex represented by formula M(Ar)(AlX4)3, where M is a rare earth metal selected from among the metals having an atomic number of from 57 to 71, inclusive in Mendeleyev's periodic table of elements, Ar is an aromatic hydrocarbon solvent, Al is aluminum and X is selected from the group consisting of fluorine, chlorine, bromine and iodine, and b) a solid support comprising at least one inorganic metal oxide compound.

Abstract: The present invention relates to a catalytic system usable for the preparation of polybutadienes by polymerisation, to a process for the preparation of said catalytic system and to a process for the preparation of polybutadienes by means of this catalytic system. A catalytic system according to the invention is based on at least: a conjugated diene monomer, an organic phosphoric acid salt of one or more rare earth metals, said salt being in suspension in at least one inert, saturated and aliphatic or alicyclic hydrocarbon solvent, an alkylating agent consisting of an alkylaluminium of formula AlR3 or HAlR2, the “alkylating agent:rare earth salt” molar ratio being greater than 5, and a halogen donor which belongs to the family of alkylaluminium halides with the exception of alkylaluminium sesquihalides, and, according to the invention, said catalytic system comprises said rare earth metal(s) in a concentration equal to or greater than 0.005 mol/l.

Abstract: The present invention relates to a cross-linkable or cross-linked rubber composition having improved hysteresis properties in the cross-linked state which is useful for the manufacture of treads for tires. The rubber composition of the present invention comprises at least one diene elastomer having a molar ratio of units originating from conjugated dienes which is greater than 30% and comprising carboxylic acid functions along its chain, and a reinforcing inorganic filler. The present invention further relates to a process for preparing such a cross-linkable or cross-linked rubber composition as well as to a tire having reduced rolling resistance and a tread for a tire where the tread comprises the rubber composition of the present invention.

Abstract: The present invention relates to a cross-linkable or cross-linked rubber composition having improved hysteresis properties in the cross-linked state which is useful for the manufacture of treads for tires. The rubber composition of the present invention comprises at least one diene elastomer having a molar ratio of units originating from conjugated dienes which is greater than 30% and comprising carboxylic acid functions along its chain, and a reinforcing inorganic filler. The present invention further relates to a process for preparing such a cross-linkable or cross-linked rubber composition as well as to a tire having reduced rolling resistance and a tread for a tire where the tread comprises the rubber composition of the present invention.