Abstract: A device for attaching an electric battery to a chassis of a motor vehicle, and including a first quarter-turn attachment mechanism to be rigidly connected to the chassis of the motor vehicle, and a second quarter-turn attachment mechanism to be rigidly connected to the electrical battery, the first and second quarter-turn attachment mechanisms being configured to engage to attach the electric battery to the chassis of the motor vehicle.

Abstract: A cylindrical element is manufactured by a process which includes depositing successive layers of thermoplastic materials in a cycle by rotation moulding, or by a technique enabling a deposit of successive layers, the cycle including at least one deposit by rotation moulding or by a technique enabling deposit of successive layers at a temperature from 170 to 240° C. The cylindrical element contains at least one layer containing an ethylene-vinyl alcohol copolymer with a density at the above temperature of between 0.94 and 1.4, and a melt flow index of between 1.3 and 4.2 g/10 minutes.

Abstract: A conducting composite material is composed of a kneaded and compressed mix. The mix includes (a) from 40 to 90% by volume of a flake graphite powder comprising a flake graphite type formed from graphite particle agglomerates bonded to each other and superposed such that their principal planes are parallel to each other, these agglomerates having a planar anisotropy with side dimensions between 10 ?m and 1 mm and between 5 and 50 ?m thick, (b) from 0 to 25% by volume of conducting fibres, and (c) from 10 to 40% by volume of an organic binder. This material can be used for making electrodes for fuel cells.

Abstract: The invention relates to a process for the preparation of poly(?-methylstyrene) by anionic polymerization of the ?-methylstyrene monomer, said process successively comprising the following stages: a) a stage of preparation of a solution comprising the ?-methylstyrene monomer and a nonpolar aprotic solvent; b) a stage of neutralization of the solution prepared in a) comprising the addition, to this solution, of an effective amount of at least one monofunctional organometallic initiator, so as to neutralize the proton sources of the solution prepared in a); c) a stage of cooling the solution obtained in b) to a temperature of less than 0° C.

Abstract: This invention relates to a composite conducting material comprised of a mixture of flake graphite and thermoplastic polymer powder sintered at high pressure that can be used for realizing a fuel cell electrode. The mixture comprises a first type of flake graphite composed of flakes having a granulometry between 10 and 100 ?m and/or a second type of flake graphite comprised of clusters of particles of graphite linked and superimposed upon each other in such a fashion that their principal planes are parallel to each other; said clusters having a planar anisotropy and having between 10 ?m and 1 mm in length and between 5 and 50 ?m in thickness, the mixture also comprising a thermoplastic polymer powder having a granulometry between 10 and 200 ?m, the flakes and/or the clusters having their principal planes parallel to each other.

Abstract: The invention relates to a process for the preparation of poly(?-methylstyrene) by anionic polymerization of the ?-methylstyrene monomer, said process successively comprising the following stages: a) a stage of preparation of a solution comprising the ?-methylstyrene monomer and a nonpolar aprotic solvent; b) a stage of neutralization of the solution prepared in a) comprising the addition, to this solution, of an effective amount of at least one monofunctional organometallic initiator, so as to neutralize the proton sources of the solution prepared in a); c) a stage of cooling the solution obtained in b) to a temperature of less than 0° C.

Abstract: A multi-layer thermoplastic structure that has at least one layer that is between 0.3 and 20 mm thick and is made of an ethylene-vinyl alcohol copolymer with a density of between 0.94 and 1.4, and a melt flow index of between 1.3 and 4.2 g/10 minutes at a temperature between 170 and 240 degree C. The multi-layer thermoplastic structure is obtained by rotation moulding and is of particular benefit when functioning as a gas tank.

Abstract: The present invention relates to polymers of poly(ethynylene phenylene ethynylene silylene) type comprising an inert spacer in the main chain of the polymer. The invention also relates to processes for preparing said polymers and to the cured products that may be obtained by heat-treating said polymers. The polymers according to the invention may be used especially in matrices for composites.

Abstract: Heat-stable poly(ethynylene phenylene ethynylene polysiloxene(silylene)) polymers preferably of determined molecular mass, optionally bearing at the end of the chain groups derived from a chain-limiting agent. Processes for preparing these polymers, cured products obtained by heat-treating these polymers, and composite matrices comprising these polymers.

Abstract: Composition comprising a blend of at least one poly(ethynylene phenylene ethynylene silylene) polymer and of at least one compound capable of exerting a plasticizing effect in the blend, once this blend has been cured.

Abstract: Heat stable poly(ethynylene phenylene ethynylene silylene) polymers with a determined molecular weight bearing at the chain end, groups derived from a chain limiter. Methods for preparing these polymers, hardened products obtained by heat treatment of these polymers, and matrices for composites comprising these polymers.

Abstract: This invention relates to a composite conducting material comprised of a mixture of flake graphite and thermoplastic polymer powder sintered at high pressure that can be used for realizing a fuel cell electrode. The mixture comprises a first type of flake graphite composed of flakes having a granulometry between 10 and 100 &mgr;m and/or a second type of flake graphite comprised of clusters of particles of graphite linked and superimposed upon each other in such a fashion that their principal planes are parallel to each other; said clusters having a planar anisotropy and having between 10 &mgr;m and 1 mm in length and between 5 and 50 &mgr;m in thickness, the mixture also comprising a thermoplastic polymer powder having a granulometry between 10 and 200 &mgr;m, the flakes and/or the clusters having their principal planes parallel to each other.

Abstract: The invention relates to a conducting composite material composed of a kneaded and compressed mix.

Abstract: The invention concerns poly(ethynylene phenylene ethynylene silylene) polymers comprising an inert spacer in the main chain of the polymer. The invention also concerns methods for preparing said polymers and hardened products obtainable by heat treatment of said polymers. The inventive polymers can in particular be used in matrices for composites.

Abstract: This invention relates to a multiple layer thermoplastic structure, use of the said structure for manufacturing a tank, and a tank comprising the said structure.

Abstract: This invention relates to a process for making a cylindrical element by rotation moulding, or by a technique enabling deposit of successive layers, and a element obtained by the said process.

Abstract: Preparation process of an assembly comprising at least one electrode with an active face, and a thermostable polymer membrane, in which the following steps are carried out: