Abstract: Process for the purifiying water using an effective proportion of a flocculating agent consisting of a reverse microlatex comprising a polymer of at least one water-soluble cationic vinyl monomer, which may be copolymerized with at least one water-soluble anionic or non-ionic vinyl monomer, possessing a molecular weight at least equal to 2.times.10.sup.6.The said microlatex is in the form of particles of a microlatex having a diameter of between 30 and 160 nm and its polydispersity index is between 1.05 and 1.2.

Abstract: A catalyst of the following formulaNi.sub.a MoO.sub.x (I)in which:a is a number from 0.6 to 1.3, andx is a number determined by the valency requirements of nickel and of molybdenum.The manufacture of this catalyst comprises the preparation of a solvated precursor and the thermal decomposition of the solvated precursor over a period of from 1 to 4 hours and at a temperature T.sub.1 of from 520.degree. to 600.degree. C. The catalyst is utilized in the oxidative dehydrogenation of propane at a temperature of from 400.degree. to 700.degree. C.

Abstract: Phenolic resin compositions.Phenolic resin compositions containing an additive consisting of at least 20% by weight of an alkaline or alkaline-earth metaborate relative to the toal weight of the additive.Applications to the manufacture of phenolic prepreg mats which are stable in storage.

Abstract: Decontaminating article comprising a preagglomerated, powdered polymer of bicyclo[2.2.1]-2-heptene or its methyl derivative in at least one fine-mesh textile bag. The bag is at least partially filled with the polymer. The decontaminating article can be used to absorb a liquid contaminating product, in particular petroleum hydrocarbon.

Abstract: Process for the preparation of a catalytic composition for the polymerization of olefins. At least partial electrochemical oxidation of aluminum in a solvent of .alpha.,.omega.-dihalogeno-alkane and simultaneously the electrochemical reduction of a compound of titanium (IV) occur in process.The catalytic composition comprises at least one titanium compound, at least one halogenated organo-aluminum compound and at least one inorganic magnesium compound in suspension in at least one .alpha.,.omega.-dihalogeno-alkane. The titanium compound is essentially a titanium (III) compound. The overall content of titanium (II) and titanium (IV) is less than or equal to 15% of the total titanium content.

Abstract: Gasket used in a fabrication method, wherein a methylmethacrylate prepolymer or a mixture of unsaturated monomers, whose main constituent is methylmethacrylate, or the unsaturated monomer or monomers themselves is (are) introduced into a mold comprised of two parallel plates separated by said gasket, and the mold is brought to a temperature sufficient to complete or carry out the polymerization. The gasket consists of a core of plasticized poly(vinylchloride), said core being sheathed by a thin layer of thermoplastic polymers chosen from among propylene polymers and saturated polymers, said thermoplastic polymer being capable of retaining its elasticity at temperatures ranging from 20.degree. to 120.degree. C. and having a melting or softening point higher than 115.degree. C.

Abstract: Urea-formaldehyde resins, particularly useful for producing particle boards having lower rates of release of formaldehyde are synthesized in several stages including a stage of further condensing a first condensate having a F/U molar ratio of 1.8-2.3 and which was condensed at a pH of between 6 and 8. The further condensing is conducted at a pH of between 6 and 8 until a cloud point with water is reached at 10.degree.-40.degree. C. making it possible to obtain resins which are reactive and stable during storage.

Abstract: Flame-retarded polymer compositions comprising a hydrated inorganic filler, at least one ethylene/alkyl (meth)acrylate copolymer and at least one copolymer of ethylene and of at least one .alpha.-olefin, which compositions consist essentially of 120 to 240 parts by weight of hydrated inorganic filler per 100 parts by weight of a polymer phase consisting of:(a) 30 to 75 parts by weight of at least one ethylene/alkyl (meth)acrylate copolymer (A) having a content of alkyl (meth)acrylate of between 1 and 50 mol %,(b) 10 to 30 parts by weight of at least one ethylene/alkyl (meth)acrylate/unsaturated dicarboxylic acid anhydride terpolymer (B),(c) 5 to 55 parts by weight of at least one copolymer of ethylene and of at least one .alpha.-olefin (C) having a density of between 0.865 and 0.915 and a degree of crystallinity equal to at least 5%, and(d) 0 to 5 parts by weight of at least one low-density polyethylene (D).Industrial articles comprising such a flame-retarded polymer composition.

Abstract: The catalyst system is characterized in that it comprises:at least one platinum complex of formula LPtX.sub.2 in which L is an organic compound containing at least two phosphorus atoms capable of coordinating platinum and X is a halogen atom, andat least one combination formed between iron and an alkene carbonate, the alkene group preferably containing from 2 to 6 carbon atoms.The process for its preparation is characterized in that at least one combination formed between iron adn the alkene carbonate is reacted with at least one platinum complex of formula LPtX.sub.2 in at least one solvent for the said complex, at a temperature of between 10.degree. C. and the boiling point of the said solvent. The combination of iron and of an alkene carbonate may be formed by electrochemical reduction.

Abstract: A process for the preparation of a urea-formaldehyde resin exhibiting reduced gel time and improved stability, wherein the resin contains not more than 10% melamine, which is added during the first stage of the reaction with the other reactants, and wherein the reaction is conducted at an acidic pH.

Abstract: New acrylic derivative of urea: monomethylolacrylamidomethyleneurea.Preparation process, according to which acrylamidomethyleneurea is reacted with formaldehyde.Application to the manufacture of additives suitable for use in aminoplastic resins.

Abstract: An impregnation pitch having a Kraemer-Sarnow softening point ranging from about 60.degree. C. to 80.degree. C., a content of quinoline-insoluble substances less than or equal to 7% by weight, and a filterability index greater than or equal to 4.5. A process for the manufacture thereof, wherein a tar or a pitch having a Kraemer-Sarnow softening point not exceeding 60.degree. C. and a content of quinoline-insoluble substances below or equal to 7% by weight is subjected to a thermal treatment capable of removing constituents with a molecular mass of below 1,200.

Abstract: The preparation of aminoplastic resins containing melamine, having very low rates of formaldehyde emission, and being particularly useful for the production of particle boards. In a second stage of the process for preparing the resin, additional NH.sub.2 (melamine and urea) is added to a conventional condensate solution at an increased pH between 6 and 9 so as to lower the F/NH.sub.2 molar ratio to between 0.5 and 0.9. Urea is added in a third stage to obtain an F/NH.sub.2 of between 0.30 and 0.50, with the optional addition of borax.

Abstract: Polymer composition based on a mixture of 15 to 50% by weight of a propylene polymer and of 50 to 85% by weight of a flexible ethylene copolymer. The flexible ethylene copolymer is either a terpolymer (A) comprising from 83 to 92.7 mol % of ethylene, from 7 to 14 mole % of at least one alkyl (meth)acrylate, whose alkyl group has from 1 to 8 carbon atoms and from 0.3 to 3 mol % of at least one unsaturated dicarboxylic anhydride, or a mixture comprising, for 100 parts by weight, at least 70 parts by weight of the terpolymer (A) and at most 30 parts by weight of at least one copolymer (B) selected from ethylene copolymers comprising from 86 to 93 mol % of ethylene and from 7 to 14 mol % of at least one copolymerizable monomer selected from alkyl (meth)acrylates whose alkyl group has from 1 to 8 carbon atoms and ethylene copolymers comprising 92 to 98 mol % of ethylene and from 2 to 8 mol % of at least one C.sub.3 -C.sub.10 .alpha.-olefin, the said ethylen/.alpha.

Abstract: A process for the production of aromatic petroleum resins by the cationic copolymerization of a C.sub.6 -C.sub.12 aromatic cut and the product obtained by the thermal polymerization of a dicyclopentadiene cut, products produced by the process, and the application in the manufacture of printing inks, varnishes and paints.

Abstract: A process for the manufacture of methyl methacrylate from isobutyric acid employing a catalytic oxidative dehydrogenation reaction in the vapor phase followed by condensation, liquid-liquid extraction, esterification, separation and purification steps.

Abstract: New process for manufacturing urea/formaldehyde resins.New process, according to which a urea/formaldehyde precondensate containing monomethylolacrylamidomethyleneurea is added to the urea/formaldehyde resins.Applications for the gluing of wood, in aminoplastic resins.

Abstract: Precondensates of urea and formaldehyde containing monomethylolacrylamidomethyleneurea are produced from pure acrylamidomethyleneurea and urea/formaldehyde precondensate or from the starting substances used for the manufacture of acrylamidomethyleneurea with formaldehyde. They are useful additives for aminoplastic resins, which in turn may be used as glue in the manufacture of chipboard sheets.

Abstract: Curing aminoplastic resins containing urea and melamine by adding as the curing catalyst, a triazinone derivative.

Abstract: In the manufacture of creep-free prepregs based on phenolic resins of the resole type, the reinformcing agents are impregnated with an essentially solvent-free mixture of a phenolic resin and a viscosity controlling amount up to 60% by weight of the resin of an alkali metal metaborate or an alkaline-earth metaborate or a mixture thereof. The resultant compression molded articles exhibit improved strengths.