Abstract: The object of the present invention lies in offering plastic film having a suitable degree of moisture permeability and low water droplet adhesion.Plastic film which is characterized in that, in plastic film of moisture permeability, as prescribed in JIS Z0208, of less than 1000 g/m.sup.2 /24 h, there is lamination with a film of moisture permeability at least 1000 g/m.sup.2 /24 h.

Abstract: Aqueous emulsions based on acrylic polymers and their use for preparing films to be used in processes of preparation of cathode ray tubes, having filming temperature between about 20 and 40.degree. C. which after drying produce films which, submitted to heating in nitrogen atmosphere, have a weight loss, for films having a thickness of 1-2 mm, and for the following cycle of heating:11.degree. C./minute from 25 to 375.degree. C.,5.degree. C./minute from 375 to 440.degree. C.,isotherm at 440.degree. C. for 45 minutes,respectively of:from 25 to 245.degree. C. lower than 15% by weightfrom 245 to 375.degree. C. from 30 to 70% by weightfrom 375 to 440.degree. C. of 97-99% by weightafter the isotherm at 440.degree. C. the remaining residue is lower than about 0.3% by weight, the curve gradient in the on set point ranging from 0.03 to 0.08 mg/.degree. K, and at 360.degree. C. from 0.12 to 0.30 mg/.degree. K; the on set temperature being at most of 300.degree. C.

Abstract: The invention relates to a process for the preparation of a solid catalytic component of metallocene type for the polymerization of olefins comprising a stage of reaction between a support and a derivative of formula R.sup.1 M.sup.1 X.sup.1.sub.3, in which R.sup.1 represents a hydrocarbon radical, M.sup.1 represents a silicon, germanium or tin atom and X.sup.1 represents a halogen atom. The solid catalytic component according to the invention exhibits a high activity in the polymerization or copolymerization of olefins and can lead to polymers or copolymers of high molecular mass and of low polydispersity, for example less than 2.5.

Abstract: Composite latex whose average particle size is between 30 and 150 nm, as these particles result from polymerization of a mixture hydrophobic monomers composed of styrene and (meth)acrylic esters to produce an emulsion in an aqueous solution of a water-soluble or water-dispersible amphiphilic copolymer having a molecular weight of between 500 and 5,000 and whose acid number of less than 500, said latex being composed of a combination of hydrophobic and hydrophilic monomers incorporating carboxylic acid functions in the presence of a radical-producing initiator, wherein said aqueous water-soluble amphiphilic polymer is free of any other surfactant or protective colloid and wherein the mass percentage of amphiphilic copolymer in relation to the dry extract of the latex between 10 and 50%.

Abstract: The invention relates to films made of compositions comprising:at least one polyamide (A),at least one polymer (B) comprising polyamide blocks and polyether blocks,at least one polyolefin (C), andat least one functionalized polyolefin (D); such that the impact strength (Dart Test) is greater than that of a film containing the same proportions of (A), (C) and (D) but not containing (B).

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: 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 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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.