Abstract: In order to improve the barrier effect to fats of the cationic fluorinated copolymers of Patent EP 542,598 resulting from the copolymerization of at least one polyfluorinated monomer, of at least one aminoalkyl (meth)acrylate and of at least one vinyl monomer (in particular vinyl acetate), they are subjected to the action of hydrogen peroxide during the salification stage or after the latter.

Abstract: Novel associative acrylic polymers prepared by radical inverse emulsion polymerization. It is a methacrylic ester in which the radical is composed of a hydrophilic segment and of a hydrophobic segment. The associative polymers of the invention can be used as thickeners, flocculating agents or filler-retaining agents.

Abstract: A thermoplastic composition for a light-scattering shaped article comprises a transparent thermoplastic polymer, especially a (meth)acrylic (co)polymer and polyamide particles having an average size of from 0.4 to 200 .mu.m. A sheet obtained from the composition can be used in light display devices.

Abstract: The present invention relates to a one-component system based on coreactive latexes which is able to lead to coatings which are crosslinkable at room temperature and post-crosslinkable by heat treatment, the said system consisting of a mixture of two particle dispersions, (A) and (B), each obtained by aqueous emulsion polymerization of a monomer composition A and B, respectively, (a) at least one free-radically polymerizable ethylenically unsaturated monomer comprising a functional group ##STR1## where X represents O or S, which enters into the monomer composition A; and (b) at least one free-radically polymerizable ethylenically unsaturated monomer comprising a masked aldehyde functional group selected from acetal, mercaptal, mercaptol, dioxolane and dithiolane, which enters into the monomer composition B.

Abstract: Ethylene is chlorinated in a reaction zone to form a product stream containing 1,2-dichloroethane, the latter being then thermally cracked in a cracking zone to form vinyl chloride. Light by-products formed during the thermal cracking step are chlorinated in a zone external and directly downstream of the reaction zone used for the preparation of the 1,2-dichloroethane product stream. The product stream leaving the chlorination reaction zone for the 1,2-dichloroethane are passed into said downstream zone so that the light by-products are chlorinated in the presence of said product stream.

Abstract: Method for improving the yield of lighter components in heat-refining process of petroleum heavy oil, and additive used in the method. The heat-treatment in a heating unit is effected in the presence of at least one compound (I) having at least one mercapto alkylthio group: HS--C.sub.m H.sub.2m --S--, in which "m" is an integer of 2 to 4.

Abstract: A composition including an aprotic polar solvent such as DMSO, a non-protic water-soluble ether, a water-soluble thickener selected from acrylic acid polymers and an aliphatic amine having 6-20 carbon atoms.

Abstract: Cellulose microfibril reinforced polyers, corresponding latices, powders, films and rods, and uses thereof. Polymer/cellulose composites are prepared using individualized cellulose microfibrils with a high form factor, e.g., tunicin microfibrils, as the reinforcement. For this purpose, reinforced latices consisting of a polymer latex and a stable aqueous suspension of said microfibrils are used. Said polymers have a wide variety of uses, particularly in paints and nanocomposites.

Abstract: To replace bromotrifluoromethane (R-13B1) in very low temperature refrigeration, the invention proposes to employ a mixture containing, on a mass basis, 25 to 50% of difluoromethane and 50 to 75% of pentafluoroethane.A third component may be incorporated in this mixture.

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: An immiscible polymer system is disclosed, said system itself ecomprising a stable mixture of polymers that are individually miscible with the polymers to be compatibilized. The compositions consisting of this polymer mixture may be obtained by extrusion.

Abstract: The invention provides a film having low permeability to hydrocarbons comprising at least one layer (i) formed of a polyamide/polyolefin alloy having a polyamide matrix and at least one layer (ii) formed of a polyolefin. The invention also provides a release film for a sheet molding compound consisting of said film, as well as a packaging for expandable polystyrene formed of said film.

Abstract: A mixed oxide solid composition of formula (I):Mo.sub.12 W.sub.a Bi.sub.b Fe.sub.c Co.sub.d Ni.sub.e Si.sub.f K.sub.g Sn.sub.h O.sub.x (I)where O.ltoreq.a.ltoreq.5, 0.5.ltoreq.b.ltoreq.5, 0.1.ltoreq.c.ltoreq.10, 0.5.ltoreq.d.ltoreq.10, 0.ltoreq.e.ltoreq.10, 0.ltoreq.f.ltoreq.15, 0.ltoreq.g.ltoreq.1, 0.ltoreq.h.ltoreq.2 and x is the quantity of oxygen bonded to the other elements and depends on their oxidation states, is used in the manufacture of acrolein by oxidizing propylene, the solid composition reacting with propylene according to the redox reaction (1):solid.sub.oxidized +propylene.fwdarw.solid.sub.reduced +acrolein(I)To manufacture acrolein, gaseous propylene is passed over a solid composition of formula (I), to conduct the redox reaction (1) by operating at a temperature of 200 to 600.degree. C., at a pressure of 1.01.times.10.sup.4 to 1.01 to 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: Electrolysing an aqueous solution of sodium chloride by means of a cell comprising a cation-exchange membrane which divides the cell into an anode compartment and an cathode compartment in which the said cathode is placed directly against the cation-exchange membrane, the said cathode compartment being supplied with a humidified gas containing oxygen, characterized in that, in order to obtain a concentration by weight of sodium hydroxide between the cation-exchange membrane and the cathode of less than 38.8%, use is made of an aqueous solution of sodium chloride (anolyte) having a concentration by weight of sodium chloride of less than 200 g/l, and in that the water humidifying the gas containing oxygen is in the form of water vapour.

Abstract: The invention relates to injected components based on polyamide resin (A) and on at least one copolymer (B) of ethylene and of an unsaturated epoxide, the copolymer (B) being obtained by copolymerization or by grafting the epoxide. The copolymer (B) is advantageously an ethylene/alkyl (meth)acrylate/glycidyl (meth)acrylate copolymer. The melt flow index of the compositions containing (A) and (B) is greater than the ratio of the melt flow index of (A) over 0.175 times the weight percentage of (B).

Abstract: Process for purifying a thiophene contaminated by mercaptans comprising selectively oxidizing the mercaptans to form polysulphides, then distilling the thiophene in this way.

Abstract: The present invention relates to a catalyst based on titanosilicalites having a content by weight of alkali metal or metals of between 0.05 and 2%. The subject of the invention is more particularly a process for producing N,N-disubstituted hydroxylamine from hydrogen peroxide and the corresponding disubstituted amine.

Abstract: The photocatalytic action of titanium dioxide and the anti-odor activity of undecylenic acid or its compounds are combined in an atmospheric scrubbing or renewal system. The invention consists in placing a filter impregnated with these two substances and exposed to a natural or artificial source of ultraviolet radiation in the path of the air.

Abstract: Living random (meth)acrylic copolymers, facilely converted into random co(meth)acrylates and block copolymers thereof, comprise the anionic copolymerizates of at least one comonomer A with at least one comonomer B selected from among the (meth)acrylates and maleimides, at least one of the comonomers A and B comprising a (meth)acrylate, in the presence of (i) at least one alkali or alkaline earth metal, mono- or difunctional initiator and (ii) at least one ligand, for example a nonnitrogenous macrocyclic complexant, e.g., a crown ether, or an alkali metal alcoholate.

Abstract: The present invention provides a sheet molding compound consisting in a sandwich structure comprising a central layer of reinforced uncured heat hardenable sheet molding compound; and two outer layers of a release film having low permeability to hydrocarbons comprising at least one layer (i) of a polyamide/polyolefin alloy having a polyamide matrix and at least one layer (ii) of a polyolefin.