Abstract: The present invention relates to the use of insulating fluids, selected from the group consisting of aliphatic esters, alkylbenzenes, crosslinkable compositions comprising at least one polydiene polyol, at least one polyisocyanate and at least one chemically inert liquid charge, for the impregnation of the wound coils of self-healing capacitors.

Abstract: The invention concerns a diaphragm chlor-alkali electrolysis cell comprising a cover, a conductive base for supporting the anodes and a cathode in the form of a box provided with internal wall, external wall and tubular fingers made of a mesh or perforated sheet covered with a porous diaphragm. One or more copper sheets for electric current distribution are fixed to the cathode external walls. The connection between the copper sheets and the cathode external walls is made by means of bolts with the interposition of a conductive and deformable element provided with residual elasticity under compression. The weldings for the assembling of the cathode walls are free from internal stresses.

Abstract: The invention relates to the use of compounds of formula:[M(II).sub.1-x M*(III).sub.x (OH).sub.2+x ].mH.sub.2 O (I)in which M(II) represents a divalent cation chosen from the group consisting of nickel, zinc, cobalt, magnesium or the mixture of two or more of the abovementioned metals; M(III) represents a trivalent cation, such as aluminum, gallium, iron or chromium, with the exception of the compound of formula (I) in which M(II) is magnesium and M(III) is aluminum, x is between 0.20 and 0.33 and m.ltoreq.1; in the preparation of .beta.-hydroxycarbonyl and/or .alpha.,.beta.-unsaturated carbonyl compounds.

Abstract: The invention relates to antistatic wrapping films comprising at least one layer made of polyamide or of an alloy of polyamide and of polyolefin. The antistatic additive is a polymer containing polyamide blocks and polyether blocks. They are particularly useful for wrapping expandable polystyrene which contains pentane.

Abstract: For manufacturing an alkanesulphonyl chloride by photochemical reaction of an alkane with chlorine and sulphur dioxide, the light source used is a gallium-doped medium-pressure mercury lamp.

Abstract: The invention comprises a curable composition comprising: (i) a blocked reactive component wherein the blocked reactive component is a blocked isocyanate or a blocked isothiocyanate; (ii) a functional compound reactive with the blocked reactive component, the functional compound containing reactive hydrogen; (iii) a catalyst for promoting the reaction of the reactive component with the blocked functional compound, wherein said catalyst is based on the reaction product of manganese, cobalt, nickel, copper, zinc, germanium, antimony, or bismuth, or the oxides thereof with a mercaptan, or an organic acid, wherein said organic acid is hexanoic, oxalic, adipic, lactic, tartaric, salicylic, thioglycolic, succinic, or mercapto succinic acid, or the reaction product of copper or germanium, or the oxides thereof with a lower aliphatic acid.

Abstract: Polyamide-based petrol supply tube, especially for engines, characterized in that it comprises an outer layer of polyamide, a middle layer of fluoropolymer, preferably of PVDF, and an inner layer of polyamide, these layers being respectively bonded to each other by layers of adhesive bonding agent.

Abstract: A process for the purification of pentafluoroethane (F125) containing chloropentafluoroethane (F115). The F125-F115 mixture to be purified is subjected to an extractive distillation, the extractant being a C.sub.5 -C.sub.8 perfluoroalkyl halide.

Abstract: The present invention relates to a process for the preparation of products of formula (1): ##STR1## in which R denotes H or an alkyl group containing from 1 to 10 carbon atoms, it being possible for this alkyl group to be substituted by one or more aryl, heteroaryl, hydroxyl or alkenyl groups, in which process hydrazine is reacted with a deficiency of carboxylic acid RCOOH and then the water of reaction and optionally the water of dilution of the hydrazine and of the acid is removed.It is particularly useful for preparing 4-amino-1,2,4-triazole.

Abstract: The present invention is directed to a multilayer material having in order a layer of fluorinated polymer, a layer of binder for fluorinated polymer having a polymer A with moieties (1)-(4), and a layer of polymer which is incompatible with the fluorinated polymer. The multilayer material is useful for making a pipe which has a superior barrier properties to petroleum products and the additives thereof. The present invention also relates to a pipe having a multilayer structure having two layers of polyamide and a layer of binder comprising a polymer A with glutarimide moieties (1)-(4) in between. The pipe has superior barrier properties to petroleum products and the additives.

Abstract: This composition for stripping paints, varnishes or lacquers coating a substrate is characterized in that it consists of or comprises:(A) 1 to 100 parts by weight of a mixture (A1) of at least one aromatic solvent chosen from benzaldehyde, toluene, xylene and anisole and (A2) of benzoic acid;(B) 99 to 0 parts by weight of water;(A)+(B) representing in total 100 parts by weight.In particular, (A) consists of a commercial benzaldehyde which contains benzoic acid.

Abstract: In order to remove the salts (in particular NH.sub.4 Cl) present in an aqueous sulphonamide solution (in particular CH.sub.3 SO.sub.2 NH.sub.2), the solution is subjected to a two-compartment electrodialysis. By maintaining the pH at a value below 7, the formation of ammonia is avoided. The demineralized solution can be concentrated in order to receover after crystallization, the sulphonamide.

Abstract: A process for the production of hydrogen bromide gas by direct combustion of bromine in hydrogen involves carrying out the combustion reaction in an apparatus chamber made of impregnated graphite and a cooling zone composed of a steel jacket in which are piled blocks of impregnated graphite.

Abstract: The invention relates to a composition including (i) at least one polyamide and at least one copolymer (A) of ethylene with at least one comonomer chosen from unsaturated carboxylic acids, esters of unsaturated carboxylic acids or vinyl esters of saturated carboxylic acids and (ii) being in powder form. These compositions are subsequently deposited on metal substrates and then a highly corrosion-resistant coating is obtained by melting.

Abstract: The invention comprises a curable composition comprising: (i) a blocked reactive component wherein the blocked reactive component is a blocked isocyanate or a blocked isothiocyanate; (ii) a functional compound reactive with the blocked reactive component, the functional compound containing reactive hydrogen; (iii) a catalyst for promoting the reaction of the reactive component with the blocked functional compound, wherein said catalyst is based on the reaction product of manganese, cobalt, nickel, copper, zinc, germanium, antimony, or bismuth, or the oxides thereof with a mercaptan, or an organic acid, wherein said organic acid is hexanoic, oxalic, adipic, lactic, tartaric, salicylic, thioglycolic, succinic, or mercapto succinic acid, or the reaction product of copper or germanium, or the oxides thereof with a lower aliphatic acid.

Abstract: In order to manufacture pentafluoroethane (F125) and/or 1,1,1,2,3,3,3-haptafluoropropane (F227ea), a trifluoromethane gas stream is subjected to pyrolysis and then the mixture of gases which result from this pyrolysis is brought into contact with a fluorination catalyst.

Abstract: Solid mixed oxides composition of formula (I):Mo.sub.12 V.sub.a Sr.sub.b W.sub.c Cu.sub.d Si.sub.e O.sub.x(I)2.ltoreq.a.ltoreq.14, 0.1.ltoreq.B.ltoreq.6, 0.ltoreq.c.ltoreq.12, 0.ltoreq.d.ltoreq.6, 0.ltoreq.e.ltoreq.15; x is the quantity of oxygen bonded to the other elements and depends on their oxidation states, are used in the manufacture of acrylic acid by oxidation of acrolein, the said solid composition reacting with acrolein according to the redox reaction (1):SOLID.sub.oxidized +ACROLEIN.fwdarw.SOLID.sub.reduced +ACRYLIC ACID(1).To manufacture acrylic acid, a gaseous mixture of acrolein and of water vapor and, if appropriate, of an inert gas is passed over a solid composition of formula (I), to conduct the redox reaction (1) by operating at a temperature of 200 to 500.degree. C., at a pressure of 1.01.times.10.sup.4 to 1.01.times.10.sup.6 Pa (0.1 to 10 atmospheres), and with a residence time of 0.01 second to 90 seconds, in the absence of molecular oxygen.

Abstract: The present invention relates to flexible thermoplastic compositions having a polyamide matrix, a dispersed polyethylene phase, and flame-retardant agents distributed between the two phases. These compositions have good mechanical properties, improved fire resistance and resistance to solvents and optionally excellent dimensional stability when hot. They can be used as coverings for electrical cables, as pipes, or in the creation of objects obtained by molding, forming, or film-forming.

Abstract: The invention relates to compositions comprising a matrix of an alloy of (a) polyamide and (b) polymer having polyamide blocks and polyether blocks, dispersed in which matrix is a crosslinked phase (c), the said compositions having a melt strength of more than 1.5 and a flexural modulus at 23.degree. C. (in accordance with ISO 178-93) of less than 700 MPa and preferably between 50 and 250 MPa.Such a composition is useful for manufacturing extrusion blow-moulded parts, especially for cars.It also relates to articles additionally comprising a part made of polyamide and polyolefin or of a mixture of polyamide and polyolefin.

Abstract: A process for the manufacture of organic disulphides and polysulphides using a basic resin catalyst wherein the catalyst is a polystyrene-divinylbenzene resin functionalized with ethylenediamine or a polyethylenepolyamine groups.