Abstract: The invention concerns hydrophobic films for coating surfaces obtained by drying at low temperature, not requiring coalescent agents, latex containing a core-structured polymer with soft characteristic having a glass transition temperature lower than 20° C. enclosed in a shell with hard characteristic having a glass transition temperature higher than 50° C.

Abstract: The invention concerns a composition comprising an ethylene/alpha-olefin metallocene copolymer and an ethylene/alkyl (meth)acrylate radical copolymer, the ratio of their secant moduli being greater than 1. The invention also concerns films obtained from said composition, in particular a stretchable adhesive film, and a high temperature extrusion method.

Abstract: The present invention relates to a process for the preparation of products of formula (1): 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: In order to replace 1,1,2-trichloro-1,2,2-trifluoroethane and 1,1-dichloro-1-fluoroethane in compositions for treating solid surfaces (in particular defluxing), the invention proposes the use of a quasi-azeotropic mixture containing, by weight, from 75 to 95% of 1,1,1,3,3-pentafluorobutane, from 1 to 15% of methylene chloride and from 1 to 10% of methanol.

Abstract: The invention relates to a mixture which is useful as a coextrusion binder, comprising: at least (A) one polyethylene or one ethylene copolymer, at least (B) chosen from (B1) polypropylene or a propylene copolymer, (B2) poly(1-butene) homo- or copolymer, and (B3) polystyrene homo- or copolymer, the mixture of (A) and (B) being grafted with a functional monomer, this grafted mixture itself optionally being diluted in at least one polyolefin (C) or in at least one polymer (D) of elastomeric nature or in a mixture of (C) and (D). The invention also relates to polyolefin/binder/polyamide, EVOH, polyester or metal structures. The invention is useful for making packaging.

Abstract: Certain mixtures of two superabsorbent powders having very different capillary suctions exhibit a resulting capillary suction which approaches the higher value. The resulting mixtures simultaneously exhibit a high capillary suction and a high intrinsic absorption capacity.

Abstract: Aqueous alkali metal chloride solutions, typically destined for electrolysis for the production of chlorine and containing a contaminating amount of iodine values in other than the periodate state, are purified by oxidizing the iodine values therein to the periodate oxidation state of +7 and then separating such periodate values therefrom. The starting alkali metal chloride solutions may also contain contaminating amounts of ammonium values, which in turn are oxidized, preferably simultaneously, to molecular nitrogen and degassed therefrom.

Abstract: The present invention relates to the manufacture of a dialkylaminoalkyl (meth)acrylate by transesterification of methyl or ethyl (meth)acrylate with an amino alcohol. The transesterification catalyst is chosen from tetrabutyl, tetraethyl and tetra(2-ethylhexyl) titanates. The reaction is carried out in a stirred reactor at 90-120° C., after which the crude reaction mixture is sent to a tailing column (C1), the flow from the top of this column is sent to a topping column (C2) and the flow from the bottom of this column si then sent to a final rectification column (C3). A dialkylaminoalkyl (meth)acrylate of high purity is obtained in this way.

Abstract: The invention relates to a process for the manufacture of a solid catalytic component for the polymerization or copolymerization of olefins, resulting in a polymer or copolymer with broadened molecular mass distribution. The process includes a first stage including bringing into contact a) a solid support including at its surface at least 5 hydroxyl groups per square nanometre (OH/nm2) and b) an organic magnesium derivative, and optionally, preferably, c) an aluminoxane, to obtain a first solid, and then a second stage including bringing the first solid and a chlorinating agent into contact to obtain a second solid and then, in a later stage, impregnation of the second solid with a transition metal derivative.

Abstract: The invention relates to a process for the treatment of paper consisting of the application to the paper either of a cationic resin, PAE, and of a latex containing acid functional groups, the resin and the latex being applied simultaneously but separately, or of a stable mixture prepared beforehand containing the PAE and a latex stabilized by a nonionic surfactant.

Abstract: The present invention relates to agglomerated zeolite adsorbents based on faujasite with an Si/Al ratio such that 1≦Si/Al≦1.15, at least 70% exchanged with barium and optionally with potassium, and on a binder, preferably a zeolitizable binder. They are obtained by agglomerating zeolite powder with a binder, followed by exchange of the zeolite ions for barium ions and activation of the adsorbents thus exchanged. These adsorbents are particularly suitable for the adsorption of the para-xylene contained in aromatic C8 hydrocarbon fractions in the liquid phase, in processes of simulated fluid-bed type.

Abstract: The invention provides a process for carrying out a photochemical gas-liquid process for halogenating alkylbenzenes, the process being carried out in a photochemical gas-liquid reactor comprising a vessel, a central source of radiation, a gas distributor, and additionally, inner sleeve means arranged concentrically between the source of radiation and the vessel, the inner sleeve means providing for internal recirculation of reaction liquid.

Abstract: A process for the di-tertiary-peroxide synthesis, wherein the condensation reaction between a tertiary hydroperoxide and a tertiary alcohol is carried out in the presence of an acid catalyst, constituted by a compound having a mono-sulphonated aromatic ring selected from the following formulae: wherein: R is an alkyl group having from 2 to 9 carbon atoms, preferably from 2 to 6; R′ and R″ are alkyl groups having a number of from 1 to 9 carbon atoms, preferably from 1 to 6.

Abstract: In order to remove the impurities (in particular 1-chloro-2,2-difluoroethylene) present in crude 1,1,1,2-tetrafluoroethane (F134a), a gaseous mixture of crude F134a and hydrofluoric acid is treated in the gas phase, in the presence of a fluorination catalyst, at a temperature of between 200 and 380° C. and under a pressure between atmospheric pressure and 2.5 MPa, the HF/F134a molar ratio being between 0.05 and 0.5.

Abstract: The invention concerns inhibitor compositions based on fatty sulphydryl acid and poly(ethyleneamino)imidazoline salts for considerably reducing the corrosive effect of carbon brine on iron and ferrous metals. These compositions are as efficient when the corrosive medium is driven with a high flowrate and in biphasic brine/oil medium.

Abstract: Compositions, which are stable on storage, which make it possible to obtain elastomer coatings. The compositions are obtained from a hydroxylated urethane prepolymer and from a mixture of acrylate monomer and oligomers, capable of giving an elastomer by thermal or photochemical radical polymerization; the urethane prepolymer being obtained by condensation of a conjugated diene oligomer comprising hydroxylated endings, optionally mixed with a chain extender, with a polyisocyanate compound. These compositions can be used in the protection of electrical and/or electronic components and generally as coatings for metal surfaces or for plastic surfaces.

Abstract: Described are structures comprising, successively: a first layer of high density polyethylene (HDPE), a layer of binder, a second layer of EVOH or of a mixture based on EVOH, optionally a third layer of polyamide (A) or of a mixture of polyamide (A) and polyolefin (B). Also described are devices for transferring or storing fluids and more particularly tubes, tanks, chutes, bottles and containers consisting of the above structure and in which the barrier layer (the second or the combination of the second and the third layer) is in direct contact with the fluid contained or transported.

Abstract: The invention relates to felxible and tough poly(vinylidene fluoride)-based compositions. They comprise from 0.5 to 10 parts by weight of an elastomer B and from 0.5 to 10 parts by weight of a plasticizer C per 100 parts by weight of a homopolymer (A) of vinylidene fluoride (VF2) or of a copolymer (A) of VF2 and of at least one other monomer copolymerizable with VF2, in which the said monomer is present in an amount of between 0 and 30 parts by weight per 100 parts by weight of VF2 with the additional condition that the sum of B and C is from 1 to 10.5 parts by weight and, on the other hand, in that the homopolymer or the copolymer of vinylidene fluoride, A, is chosen in such a way that it has a melt flow index, measured according to the ISO 1133 standard at 230° C. under a load of 5 kg, of less than 5 g/10 min and a critical modulus GC, at the intersection of the melt shear moduli G′ and G″ measured at 190° C., of between 5 and 22 kPa.

Abstract: The present invention relates to a process for forming composite shaped articles used for athletic shoe soles, tubes, pipes, transmission belts and conveyor belts, comprising a vulcanized elastomer directly or autogenously bonded, that is, essentially in the absence of adhesive, to a thermoplastic elastomer comprising recurring polyamide-6 and polyether structural units, such as thermoplastic polyetheresteramide elastomers, are provided. The article is prepared by a process comprising placing a thermoplastic elastomer component into a vulcanization mold, overmolding onto at least a portion of the surface area of one face surface of the thermoplastic elastomer component with a vulcanizable elastomer component, and vulcanizing the vulcanizable elastomer component at a temperature below the melting point of the thermoplastic elastomer component but over a wide temperature range, which can be about 40° C. or higher.

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, a chamber outlet composed of a cylindrical segment disposed between a converging segment and a diverging segment, and a cooling zone composed of a steel jacket in which are piled block of impregnated graphite.