Abstract: The invention relates to a separator film for a device used for storing electrical energy, the film being porous and oriented, and being obtained by stretching in a longitudinal direction and in a direction transverse to the longitudinal direction, the film containing a mixture comprising a polypropylene homopolymer, at least 10% of a copolymer obtained from monomers comprising at least propylene and ethylene, and at least one beta-nucleating agent. According to the invention, the ethylene content of the copolymer is ?1% but <10% and a propylene content of the copolymer is ?90% for a film thickness of ?8 microns and ?30 microns, corresponding to a specified space factor according to the IEC-60674-3-1 standard greater than or equal to 145% and a density of the biaxially stretched film greater than or equal to 0.18 g/cm3 but less than or equal to 0.41 g/cm3.

Abstract: A film comprising a core layer (5), first and second outer layers (3, 4), first and second intermediate layers (1, 2). The core layer (5) contains at least 50% by weight of a ULDPE. At least one of the outer layers (3, 4) contains at least 50% by weight of a LLDPE. The first and/or second intermediate layer (1, 2) is made of a first composition based on EVA and on a copolymer of ethylene and of at least one compound selected from the group consisting of the linear alkenes of order C greater than ethylene, dienes and cyclic alkenes.

Abstract: The invention relates to a separator film for a device used for storing electrical energy, the film being porous and oriented, and being obtained by stretching in a longitudinal direction and in a direction transverse to the longitudinal direction, the film containing a mixture comprising a polypropylene homopolymer, at least 10% of a copolymer obtained from monomers comprising at least propylene and ethylene, and at least one beta-nucleating agent. According to the invention, the ethylene content of the copolymer is ?1% but <10% and a propylene content of the copolymer is ?90% for a film thickness of ?8 microns and ?30 microns, corresponding to a specified space factor according to the IEC-60674-3-1 standard greater than or equal to 145% and a density of the biaxially stretched film greater than or equal to 0.18 g/cm3 but less than or equal to 0.41 g/cm3.

Abstract: The invention relates to a barrier film made up of five stacked layers comprising: a central barrier layer comprising a first blend of EVOH and of PA, two outer layers comprising a second blend, and two adhesive layers between the central layer and the two outer layers, wherein the second blend only contains a first copolymer of ethylene and of an a-olefin having a density less than or equal to 0.925 g/cm3 and greater than or equal to 0.915 g/cm3 and a second metallocene copolymer of ethylene and of an a-olefin having a density less than or equal to 0.910 g/cm3.

Abstract: A film comprising a core layer (5), first and second outer layers (3, 4), first and second intermediate layers (1, 2). The core layer (5) contains at least 50% by weight of a ULDPE. At least one of the outer layers (3, 4) contains at least 50% by weight of a LLDPE. The first and/or second intermediate layer (1, 2) is made of a first composition based on EVA and on a copolymer of ethylene and of at least one compound selected from the group consisting of the linear alkenes of order C greater than ethylene, dienes and cyclic alkenes.

Abstract: A porous composite product in the form of a film with a high specific surface. Used in a wide range of electrochemical products especially in the field of selective membranes, packaging or catalysis. The porous composite product has a high homogeneity in the distribution of the filler and a continuous structure. The product is capable of being obtained by extrusion.

Abstract: A porous composite product in the form of a film with a high specific surface. Used in a wide range of electromechanical products especially in the field of selective membranes, packaging or catalysis. The porous composite product has a high homogeneity in the distribution of the filler and continuous structure. The product is capable of being obtained by extrusion.

Abstract: A process for the preparation of a porous composite product. The process steps are forming a homogeneous mixture having one or more insoluble polymers, one or more soluble or calcinable polymers and one or more fillers, in particular with a high specific surface; extruding the mixture to form an extruded precursor product; removing the soluble or calcinable polymer or polymers from the extruded precursor product, in order to form pores, and recovering the porous composite product.

Abstract: The invention concerns a high power capacitor ideally polarizable consisting of a positive electrode (2) and its current collector (4), a negative electrode (3) and its current collector (5), said electrodes comprising a carbon containing material with high specific surface area, a separator (6) and a non-aqueous liquid electrolyte impregnating said separator and said electrodes. The invention is characterised in that the non-aqueous liquid electrolyte is an organic solution of a sodium or potassium or alkalin-earth metal salt, on their own or mixed in a solvent containing an acid.

Abstract: The present invention relates to a reconstituted tobacco leaf coated with a stripe of adhesive along one of its margins, the linear mass of the stripe of adhesive being greater than 70 mg/m in the dry state. The invention also provides a method of depositing such a stripe, and apparatus for depositing such a stripe of adhesive.

Abstract: A metallized polypropylene film that has a modulus of elasticity in bending higher than 1500 MPa, a sag point under load higher than 110.degree. C., and a Vicat point higher than 150.degree. C. The metallized film is a film for making a capacitor.

Abstract: This invention relates to a preparation process of a biaxially oriented heat-shrinkable ultra-thin film, biaxially oriented by the flat process and made of linear low-density polyethylene, characterized in that:an ethylene homopolymer or an ethylene and C.sub.4 to C.sub.18 alpha-olefinic comonomer copolymer of a density lying between 0.89 and 0.94, alone or in combination, are heated beyond the melt temperature and extruded,the extruded film is poured and cooled at the appropriate hardening temperature,the film is drawn a first time in the machine direction at the appropriate temperature between 3 and 7 times the initial dimension of the non stretched film,the film is drawn a second time in the transverse direction at the appropriate temperature between 3 and 15 times the initial dimension of the non stretched film, the biaxially oriented film is drawn a third time in the machine direction at the appropriate temperature between 1.

Abstract: The invention relates to the preparation of insertion compounds based on manganese oxide, usable as the positive electrode active material in a lithium battery.These compounds in the hatched area of FIG. 1 can be prepared by reacting in the solid state a manganese oxide powder MnO.sub.2 -.beta., having a specific surface below 7 m.sup.2 /g and an average grain size below 10 .mu.m, with a powder of a lithium compound such as Li.sub.2 CO.sub.3 or LiOH, at a temperature of 150.degree. to 500.degree. C. for an adequate time to convert the .beta.-MnO.sub.2 into manganese and lithium oxide having a lacunary or stoichiometric spinel structure.

Abstract: The present invention relates to a method of manufacturing a multilayer electrochemical assembly comprising steps consisting in co-extruding an element comprising at least one electrode film and an electrolyte film based on an ionic conductor polymer through a die so that the electrode is accessible over at least one main face of the extruded element, and over not more than one edge of said element, spiral winding a complex based on the above-specified extruded element to form a structure having, on different faces of its edges, means for making electrical contact respectively with each of the two electrodes, and metallizing said faces of the edge of the structure.

Abstract: The present invention relates to a deposit cabinet comprising a plurality of lockers, each comprising a closing door and an individual means for fastening the various doors in the closed position. According to the invention, each locking means comprises a locking mechanism, with a releasing-open member, and a centralized control system for the lockers, making it possible, on the one hand, to supply a ticket with a personal code and, on the other hand, to open a given locker by calling up in the abovementioned code on a keyboard 29.

Abstract: A separator for electrolytic capacitors, the separator being constituted by a single sheet of paper made up of at least two asymmetrical superposed layers: one of the layers having high thickness and low density, the other layer having low thickness and high density.