Abstract: A large volume metallic composite container consisting essentially of a plurality of metal plates welded end-to-end, each said metal plate having a stainless metallic layer on the periphery of at least one side thereof and on the ends thereof and a heat-sensitive anti-corrosion coating consisting essentially of a thermoplastic resin on at least one side of each said metal plate and overlapping said stainless metallic layers over a length of at least about 10 mm and at least about 10 mm from the weld used to weld the plates together. The process of making of such containers is also disclosed.

Abstract: A continuous method for the preparation of concentrated aqueous solutions of hydrazine hydrate from ketazines which are slightly soluble in water, by hydrolysis and distillation under pressure using a distillation column. The column is fed with the ketazine or ketazines and water wherein the water/azine molar ratio ranges between 5 and 7.75.

Abstract: A continuous method for the preparation of concentrated aqueous solutions of hydrazine hydrate from concentrated aqueous solutions of acetone azine by a hydrolysis reaction and distillation under pressure in a column. The concentration of the aqueous solution of acetone azine is such that the water/azine molar ratio ranges between 3 and 7.

Abstract: Novel 2,2-bis(2-perfluoroalkylethylthio)acetaldehydes having the formula: ##STR1## wherein R.sub.F and R'.sub.F are the same or different perfluoroalkyl groups, together with processes for producing the same and using the same to prepare surface active agents and products with hydrophobic and lipophobic properties.

Abstract: A fire-resistant polycarbonate composition comprising a polycarbonate and for each one thousand parts by weight thereof from about 0.1 to 10 parts by weight of a salt of the formula: ##STR1## in which R is a C.sub.1 to C.sub.6 alkyl radical or an aryl radical, unsubstituted or substituted aryl radical and M is an alkali metal selected from Li, Na, or K.

Abstract: The process of making a wet or dry dispersion containing anthraquinone suitable for use in the alkaline digestion of wood comprising cyclizing ortho-benzoylbenzoic acid at a temperature of about 150.degree. to 180.degree. C. and at an absolute pressure between about 5 and 40 millibars in the presence of between about 0.05 to 2 parts by weight of sulfuric acid, having a concentration of at least about 95%, per part by weight of ortho-benzoylbenzoic acid to form a reaction mixture containing anthraquinone, bringing the reaction mixture to a pH of at least about 7 by addition thereto at a temperature between about ambient temperature and 100.degree. C. of an aqueous solution of sodium hydroxide or potassium hydroxide containing between about 10% to 40% hydroxide by weight, and then forming a dispersion thereof and using such dispersion in the alkaline digestion of wood.

Abstract: Fluorinated telomers which can be defined by the formula:R.sub.F --C.sub.m H.sub.2m --(CH.sub.2 --CR.sub.1 R.sub.2).sub.n X (I)wherein R.sub.F is a poly- or perfluorinated radical; X is iodine, chlorine or bromine; m is 0, 1 or 2; n is from 5 to 1000; R.sub.1 is hydrogen or methyl; and R.sub.2 is a --COOH or --CONR.sub.3 R.sub.4 group, R.sub.3 and R.sub.4 being hydrogen or alkyl or hydroxyalkyl radicals, such telomers being obtained by free radical reaction of an ethylenic monomer CH.sub.2 .dbd.CR.sub.1 R.sub.2 with a fluorinated telogen R.sub.F --C.sub.m H.sub.2m --X, and being excellent surfactants in aqueous media with special usefulness as additives to fire-fighting protein-based emulsifiers.

Abstract: A process for manufacturing silver catalysts deposited on a porous refractory support, comprising impregnating a refractory support with a portion of the silver required for the catalyst by immersing the support in a practically anhydrous solution of an organic carboxylic acid salt of silver in an organic liquid which complexes the silver ions, removing excess organic liquid from the support without causing the deposition of metallic silver thereon; depositing the remainder of the silver and at least one promoter selected from cesium, rubidium, or potassium on the support modified by the first silver deposit by immersing said modified support in a practically anhydrous solution of an organic carboxylic acid salt of silver in an organic liquid which complexes the silver ions, said organic liquid containing in the solubilized state, a salt of at least one of the promoters, before transformation of the silver deposited into metallic silver.

Abstract: Composite material comprising a flexible sheath covering a roving of fibers impregnated to the core with a finely powdered thermoplastic, the melting point of which thermoplastic is equal to or greater than that of the sheathing material, together with process and apparatus for producing same by using an extrusion coating technique, the coating die being mounted on a leakproof powder fluidization tank via a blowing chamber thermally insulated from the tank.

Abstract: The present invention comprises a machine having a fixed portion and fitted with a plurality of pneumatic cylinders and pistons, at least one of said cylinders and pistons is activated by a nominal-pressure supply, and which at least one cylinder and piston forms part of a subassembly which moves with respect to the fixed portion of the machine. There is a counter-pressure system for each working phase of the subassembly cylinder, including means for counteracting the nominal-pressure supply to reduce jerking movements of the subassembly during operation. Also a speed-control unit which has a variable throttling valve and an anti-return valve is affixed to the fixed portion of the machine separated from the movable subassembly. Flexible lines are connected between the subassembly cylinder and the speed-control unit so that the mass of the movable subassembly is reduced to further reduce the jerking motion of the subassembly.

Abstract: The invention relates to the preparation of brominated derivatives of diphenyl ether. This process includes preparing an underbrominated product and perbrominating the by-products of this reaction. This process is particularly suitable for the preparation of octabromodiphenyl ether and decabromodiphenyl ether.

Abstract: An extruded composite structure consisting essentially of an outer sheath surrounding an inner core, said outer sheath consisting essentially of an extrudable resin which remains thermoplastic after extrusion and said inner core comprising a substance whose melting point or decomposition temperature is lower than the temperature to which said resin must be heated to be extruded and to the apparatus and process for making such composite structure.

Abstract: The invention involves a process for bleaching domestic laundry in a domestic washing cycle, comprising prewashing the laundry in an alkaline bath with pH between 9 and 13 and at a temperature between about 40.degree. C. to 70.degree. C. in the presence of at least one peroxide bleaching agent and an uncomplexed calcium, said calcium being present in an amount between about 0.002% to 1% by weight of the bath.

Abstract: A process for the manufacture of a polyamide powder comprising polymerizing in solution a reaction mixture comprising a monomer lactam or lactams capable of generating said polyamide in the presence of an N,N'-alkylene bisamide.

Abstract: The higher chloroalkanes, advantageously the higher chloromethanes, are continuously produced from at least one lesser chloroalkane, by (i) continuously introducing chlorine and said at least one lesser chloroalkane into a stream of reaction medium continuously and essentially autogenously recirculating in a loop circuit which comprises an essentially vertical principal reaction zone, (ii) continuously chlorinating said at least one lesser chloroalkane in said essentially vertical principal reaction zone, and (iii) continuously withdrawing higher chloroalkane product from said stream of essentially autogenously recirculating reaction medium.

Abstract: Novel 2,2-bis(2-perfluoroalkylethylthio)acetaldehydes having the formula: ##STR1## wherein R.sub.F and R'.sub.F are the same or different perfluoroalkyl groups, together with processes for producing the same and using the same to prepare surface active agents and products with hydrophobic and lipophobic properties.

Abstract: A homogeneous composite material comprising at least one external layer of thermosetting polymer, a layer of lightened thermoplastic polymer, and intermediate between the two layers, a homogeneous layer formed by polymerizing a monomer which is a diluent for the said lightened polymer; such that the monomer polymerizes to form an intimate blend at the interface of said polymers. The invention also comprises a process for producing the above said composite material.

Abstract: An apparatus for the measurement of the resistance of a test-piece to shock comprising an anvil, a mass positioned for movement along said axis and into contact with said test-piece positioned at said opening, and a movable thermal medium having a male part with a surface which is penetrable into said opening of said anvil sufficiently for conducting heat to or from said test-piece to bring it to a specified temperature and which is retractable from said opening as said mass moves to contact said test-piece.

Abstract: Compositions for the preparation of thermosetting or thermoplastic polymers, which compositions comprise a mixture of at least one polyepoxide and at least one polyamide oligomer, wherein the oligomer is a primary monoamine, an alpha,omega-primary or -secondary diamine, an alpha,omega-diacid or an alpha-primary amine,omega-acid, together with processes for preparing polymers and the uses of such materials for molding and for adhesives.

Abstract: The invention concerns the purification of impure aqueous hydrazine hydrate solutions by treating the hydrazine hydrate solution by means of a solid absorbent material consisting of microporous particles whose mean granulometry is smaller than 5 mm.