Abstract: The present invention relates to a method of covering a metal article with a film formed from the melting of a thin layer of powder comprising: physically blending 99.8 to 97% by weight of at least one polyamide and 0.2 to 3% by weight of an inorganic biocide species consisting of a soluble ceramic in which silver ions are encapsulated to form a powder blend composition; contacting the metal article with said powder composition blend to form a thin layer of said powder on the article; melting the powder blend composition onto the metal article to form a thin coating film; and cooling the coated article; where the powder blend composition is free of zinc compounds.

Abstract: The present invention relates to low-toxicity biodegradable compounds that inhibit metal corrosion, said compounds being salts obtained through the reaction of a carboxylic diacid with an imidazoline derivative. The invention also relates to the use of said corrosion-inhibiting compounds in all types of industries for drilling ore or fossil compounds, such as gas or oil.

Abstract: The present invention relates to a method of covering a metal article with a film formed from the melting of a thin layer of powder comprising: physically blending 99.8 to 97% by weight of at least one polyamide and 0.2 to 3% by weight of an inorganic biocide species consisting of a soluble ceramic in which silver ions are encapsulated to form a powder blend composition; contacting said metal article with said powder composition blend to form a thin layer of said powder on the article; melting said powder blend composition onto said metal article to form a thin coating film; and cooling said coated article; where the powder blend composition is free of zinc compounds.

Abstract: The present invention relates to the use of a powder for coating articles, this powder comprising, by weight, 99.8 to 97% of at least one polyamide and 0.2 to 3% of a soluble ceramic in which silver ions are encapsulated. This powder may be prepared by simple dry-blending of the constituents. The invention also relates to this powder. The ceramic protects the Ag ions from the temperature during application and use of the product, from UV radiation and from other components present in the formulation. It is the presence of moisture on the surface of the coating, needed for bacterial growth, which causes silver ions to be released and therefore the bacteria to be eliminated. This composition contains an inorganic biocide using silver ions as sole active metal species. This powder paint has the advantage of being able to be applied at temperatures above 300° C. without any undesirable discoloration problems and without the use of zinc compounds.

Abstract: A hydrophilic polymer with improved biodegradability and particular usefulness in detergent compositions contains units derived by polymerization from at least one monomers A bearing a carboxylic acid function or an equivalent function, units derived by polymerization from at least one monomers B bearing an electron-rich group or a function capable of introducing an electron-rich group into the main chain, and, optionally, units derived by polymerization from at least one monomers C which is copolymerizable with A and B, but is different from A and B. Examples of suitable monomers as monomers A include maleic anhydride, acrylic acid, methacrylic acid, itaconic acid, fumaric acid and maleic acid, and the salts thereof. Examples of suitable monomers as monomers B include butadiene, isoprene, chloroprene, dimethylbutadiene, cyclohexadiene, butadienecarboxylic acid, butadienedicarboxylic acid, acetylene, acetylenecarboxylic acid and acetylenedicarboxylic acid.

Abstract: Novel biodegradable polymers consisting of a biodegradable core bound to at least two carboxylic polyacid-based branches via a bond capable of being broken by hydrolysis or by oxidation are described. Biodegradable detergent compositions containing such polymers are also described.

Abstract: A hydrophilic polymer with improved biodegradability and particular usefulness in detergent compositions contains units derived by polymerization from at least one monomers A bearing a carboxylic acid function or an equivalent function, units derived by polymerization from at least one monomers B bearing an electron-rich group or a function capable of introducing an electron-rich group into the main chain, and, optionally, units derived by polymerization from at least one monomers C which is copolymerizable with A and B, but is different from A and B. Examples of suitable monomers as monomers A include maleic anhydride, acrylic acid, methacrylic acid, itaconic acid, fumaric acid and maleic acid, and the salts thereof. Examples of suitable monomers as monomers B include butadiene, isoprene, chloroprene, dimethylbutadiene, cyclohexadiene, butadienecarboxylic acid, butadienedicarboxylic acid, acetylene, acetylenecarboxylic acid and acetylenedicarboxylic acid.

Abstract: The preparation of a carboxylic ester by direct reaction of a carboxylic acid and an alcohol catalyzed by a sulphonic acid R—SO3H is carried out in the presence of a solid comprising tertiary amine functions.

Abstract: The invention concerns a method for preparing a composition containing a superabsorbent and antimicrobial powder acting as deodorizing additive. The inventive method consists in an oven drying of a mixture of the elements of the composition, at a temperature higher than 5° C. than the additive melting point.

Abstract: The preparation of a carboxylic ester by direct reaction of a carboxylic acid and an alcohol catalyzed by a sulphonic acid R—SO3H is carried out in the presence of a solid comprising tertiary amine functions.

Abstract: Compositions which greatly diminish, or eliminate, unpleasant smells associated with the use of underwear and diapers are described. These compositions are composed of superabsorbent polymers of the p6lyacrylic type and of certain boron derivatives, in particular sodium tetraborate pentahydrate. The sanitary articles which incorporate these compositions do not develop unpleasant smells, ammoniacal or otherwise.

Abstract: In order to reduce the content of sulphuric acid in an alkanesulphonic acid, an aqueous solution of the latter is brought into contact with a basic anion-exchange resin. The invention relates more particularly to the purification of 70% methanesulphonic acid.

Abstract: The invention concerns a superabsorbent composition containing a superabsorbent polymer powder, for instance polyacrylic and a zeolite powder exchanged with metal cations with bactericidal properties, in particular with silver ions. The hygiene articles incorporating them do not give off nor develop unpleasant smells though soaked with corporeal liquids.

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: An electrodialysis method using a bipolar membrane (BP) for regenerating acids, wherein a series of base (B), acid (A) and salt (S) compartments are provided between a positive electrode (anode) and a negative electrode (cathode), said compartments being defined by a series of membranes: cationic, bipolar, anionic, cationic, bipolar and so forth, and a solution being circulated through each compartment. An additional anionic membrane (10) is applied to the anionic side (11) of the bipolar membrane (BP) with no discernible gap therebetween so that contamination of the acid compartment by cations is reduced.

Abstract: Compositions which greatly diminish, or eliminate, unpleasant smells associated with the use of underwear and diapers are described. These compositions are composed of superabsorbent polymers of the polyacrylic type and of certain boron derivatives, in particular sodium tetraborate. The sanitary articles which incorporate these compositions do not develop unpleasant smells, ammoniacal or otherwise.

Abstract: Process for carrying out an enzymatic reaction, in which the substrate treated is in an organic liquid which is a fluorinated hydrocarbon, which can include halogens other than fluorine.