Abstract: The invention relates to a method for the purification of acrylamido-2-methyl-2-propanesulphonic acid comprising the following successive steps: 1) preparation of a suspension of acrylamido-2-methyl-2-propanesulphonic acid crystals by distillation of an aqueous solution of acrylamido-2-methyl-2-propanesulphonic acid in order to obtain a suspension of acrylamido-2-methyl-2-propanesulphonic acid crystals, 2) isolation of the acrylamido-2-methyl-2-propanesulphonic acid crystals generally by solid/liquid separation from said suspension in order to isolate said acrylamido-2-methyl-2-propanesulphonic acid crystals, characterised in that the distillation step is carried out continuously and at a pressure below atmospheric pressure.

Abstract: Process for preparing water-soluble polymers in powder form by polymerization of water-soluble monoethylenically unsaturated monomers comprising the successive steps: a) Spraying on the inner wall of a polymerization vessel, the lubricant composition LC1: alkyl oleate/polyoxyethylene oleyl ether phosphate/sorbitan monolaurate, b) Polymerizing in aqueous solution in the presence of polymerization initiators at least one water-soluble monounsaturated ethylenic monomer, c) Discharging the polymer gel, d) Granulating the polymer gel thus obtained in a granulator, in presence of a lubricant composition LC2: alkyl oleate/polyxoyethylene oleyl ether phosphate/sorbitan monolaurate, e) Drying the polymer gel to obtain a polymer in powder form, f) Grinding and sifting the powder.

Abstract: The invention relates to an inverse polymer emulsion having the particular feature of auto-inverting without any need for the use of an inverting agent and containing a polymer of at least one water-soluble monomer and at least one LCST macromonomer. The invention also relates to the use of the inverse emulsion in the fields of the oil and gas industry, water treatment, slurry treatment, paper manufacturing, construction, mining, cosmetics, textiles, detergents or agriculture.

Abstract: The invention relates to a method for modifying the water permeability of a subterranean formation, comprising at least the following steps: Preparing an injection fluid from a dispersion of a hydrophilic phase in a lipophilic phase, with water or brine, the dispersion comprising: a hydrophilic phase comprising at least one cross-linked (co)polymer PR, a lipophilic phase, at least one interface polymer composed of at least one monomer of formula (I): Injecting the injection fluid into the subterranean formation, said cross-linked (co)polymer PR forming a hydrogel in the presence of water.

Abstract: The present invention relates to a water-soluble polymer obtained by polymerization of at least a 2-dimethylaminoethyl acrylate monomer and/or its salts, in presence of at least a tocopherol and/or its derivatives, or a tocotrienol and/or its derivatives, and its uses.

Abstract: The present invention relates to a polymer obtained at least from a quantity A of 2-acrylamido-2-methylpropane sulfonic acid, in acid and/or salified form, characterized in that the quantity A of 2-acrylamido-2-methylpropane sulfonic acid contains 250 to 20,000 ppm by weight of 2-methyl-2-propenyl-sulfonic acid, in acid and/or salified form. The present invention also relates to the use of this polymer as a flocculant, viscosity reducing agent, thickener, absorbent, friction reducing agent or plasticizer or superplasticizer, in particular in a field chosen from among oil and gas recovery, water treatment, sludge treatment, paper manufacture, construction, mining, cosmetic product formulation, detergent formulation, textile manufacture and agriculture.

Abstract: The invention concerns a method for preparing a dispersion of a hydrophilic phase in a lipophilic phase, comprising:—a hydrophilic phase comprising at least one water-soluble (co)polymer, —a lipophilic phase, —at least one interface polymer consisting of at least one monomer of formula (I): Formula (I) in which, —R1, R2, R3 are separately a hydrogen atom, a methyl group, a carboxylate group and Z—X, —Z is chosen from the group comprising C(?O)—O; C(?O)—NH; O—C(?O); NH—C(?O)—NH; NH—C(?O)—O; and a saturated or unsaturated, substituted or unsubstituted carbon chain comprising 1 to 20 carbon atoms capable of comprising one or more heteroatoms chosen from nitrogen and oxygen, —X is a group chosen from the alkanolamides, sorbitan esters, ethoxylated sorbitan esters, glyceryl esters, and polyglycosides; and comprising a saturated or unsaturated, linear, branched or cyclic, optionally aromatic, hydrocarbon chain.

Abstract: This invention relates to the use, for the manufacture of a hydroalcoholic composition comprising at least water and at least one alcohol of a branched or cross-linked copolymer obtained from: (i) 20 mol % to 94.99 mol % of at least one monomer containing an acrylic group and bearing at least one weak acid function, (ii) 5 mol % to 79.99 mol % of at least one monomer bearing at least one strong acid function, (iii) 0.01 mol % to 4 mol % of a cross-linking/branching agent, said copolymer being obtained by precipitation polymerization, in a solvent comprising at least one alcohol.

Abstract: This invention relates to a process for preparing an inverse emulsion comprising mixing an aqueous solution comprising a water-soluble (co)polymer A synthesized from at least one cationic monomer and an inverse EMI 2 emulsion comprising a water-soluble (co)polymer B synthesized from at least one cationic monomer, optionally followed by distillation. This invention also relates to the inverse emulsion thus obtained, a detergent or cosmetic or softening composition comprising such an inverse emulsion, as well as the use of such an inverse emulsion to improve the softening properties of a fabric softening composition.

Abstract: This invention relates to an additive based on (co)polymers resulting from the reaction between at least one dialdehyde compound and at least one complex (co)polymer obtained by polymerization of water-soluble monomers in the presence of at least one host (co)polymer comprising vinylamine functions.