Abstract: A lubricant composition includes: (a) one or more base oils, (b) at least one comb polymer formed by a polyalkyl(meth)acrylate main chain, and hydrocarbon side chains including at least 50 carbon atoms, (c) at least one nitrogen-containing organic friction modifier chosen from the optionally alkoxylated fatty amines, fatty amides or imides obtained by the condensation of fatty amines and carboxylic acids, alone or in a mixture, (d) optionally, one or more organometallic organomolybdenum-type friction modifiers. This is used for the lubrication of 4-stroke gasoline or diesel engines of light vehicles, preferentially of hybrid vehicles.

Abstract: The disclosure relates to an additive composition including: (a) at least one compound including an azole heterocycle, (b) at least one alkylbenzene or alkylnaphthalene sulphonate not surbased with an alkali or alkaline-earth metal, (c) at least one carbodiimide, and (d) at least one antioxidant The disclosure also relates to the use thereof as additive composition for engine oil.

Abstract: The invention relates to polyesters containing at least one partly acylated polyhydroxylated compound belonging the group consisting of glycerol polycarbonates, specific polyglycerols, [(a-hydroxymethyl) oxyethylene/(a-hydroxymethyl)ethylene carbonate] copolymers, [a -hydroxymethyl) oxyethylene/(a-hydroxymethyl)ethylene carbonate] copolymers, and [a -alkyl) oxyethylene/(a-hydroxyalkyl) oxyethylene] copolymers. The invention also relates to methods for acylating, at least partly, the polyhydroxylated compounds. The polyesters of this invention are applicable to the technical fields relating to engine and industrial lubricants, greases, hydraulic fluids, metal deformation and processing lubricants, stripping and mold dressing products, oil prospecting, mines, tunnel borers, cosmetics, detergency, inks, textile coatings and papers, to the field of food products, to the protection of wood as synthesis intermediates.

Abstract: The invention relates to a device for repairing and fitting heat insulation capabilities of the external cladding of clad members such as tubular lines, connection members and other clad members, positioned on the seabed, said device consisting of a casing comprising attachment and/or tightening means, suitable for being mounted on said clad members, characterised in that the device comprises, inside the casing thereof, a gel type elastomer heat insulation compound, in the form of a solid or perforated lining/mat, rigidly connected to said casing and compressed by tightening on the clad member during the fitting thereof.

Abstract: The invention concerns polyesters of at least one of polyhydroxylated compounds at least partly acylated, belonging the group consisting of polyhydroxylated compounds constituted by glycerol polycarbonates, specific polyglycerols, [(a-hydroxymethyl) oxyethylene/(a-hydroxymethyl) ethylene carbonate] copolymers, [(a-hydroxymethyl) oxyethylene/(a-hydroxymethyl) ethylene carbonate] copolymers, [(a-alkyl) oxyethylene/(a-hydroxyalkyl) oxyethylene] copolymers. The invention also concerns a method for acylating at least partly one of said polyhydroxylated compounds. The invention is applicable to the technical fields relating to engine and industrial lubricants, greases, hydraulic fluids, metal deformation and processing lubricants, stripping and mold dressing products, oil prospecting, mines, tunnel borers, cosmetics, detergency, inks, textile coatings and papers, to the field of food products, to the protection of wood as synthesis intermediates.

Abstract: The present invention relates to and uses, in order to prevent crude oil from “congealing” in a transportation line, a controlled-crosslinking thermal insulation gel, i.e. relatively fluid at the start and developing in-situ gelation in lines only under certain conditions, temperature conditions among other things. In order to obtain controlled crosslinking, it is possible to carry out 1) Physical crosslinkings, i.e. physical bonds between polymers—completely reversible bonds by thermal effect and/or mechanical shear—and 2) Chemical crosslinkings: monomers or polymers having functions allowing chemical bonds to be established between polymers.

Abstract: The invention relates to additives to lubricants resulting from the condensation of a primary or secondary amine and/or of an alkylene polyamine with a copolymer containing vicinal carboxylic groups.Derivatives of phenothiazine, or naphthylamine and of diphenylamine are employed in most cases as alkylene polyamine.These compounds can be employed as multifunctional additives to lubricants.

Abstract: The invention provides polymeric compounds resulting from the condensation of a primary amine having one phenolic group in its molecule with a copolymer of carboxylic acid functions.The copolymer is formed by copolymerization of an unsaturated monocarboxylic acid with at least one derivative of such a acid or by grafting of an unsaturated acid on a hydrocarbon polymer. These compounds can be especially used as multifunctional additives to lubricants.