Abstract: Process for inhibiting the corrosion of a mass of metal (2) in contact with an acid bath (3) containing ferric ions, according to which at least a part of the bath (3) is circulated through a stack of felts (10) made of carbon or graphite, alternating with perforated plates made of iron or an iron alloy (9). The process applies to the pickling of metallurgical products made of steel in hydrochloric acid baths.

Abstract: Device for drying moist air, comprising, in an enclosure (1) provided with openings (5, 6) for the admission and removal of air, a receptacle (10) for a solid desiccant and, under the latter, a layered structure (19) of superposed mats of a filter medium.

Abstract: The seeds are coated by means of a polyester the melting temperature of which is low.The process consists in treating the seeds by means of a solution of the polyester in an organic solvent or by means of the polyester in the liquid or molten state.

Abstract: A sheet of artificial leather made of polyvinyl chloride the back of which is coated with a dry adhesive capable of being activated by heat. The dry adhesive consisting of the product of the reaction between a substantially linear hydroxypolyurethane derived from a polyester and a partially blocked aromatic triisocyanate in a proportion such that the dry adhesive has an isocyanate value of at least 100. The adhesive may additionally contain polychloroprene. The sheet of artificial leather can be used for thermocovering of rigid articles which are not previously coated with glue, especially dash boards and door panels for motor vehicles made of ABS resin.

Abstract: The process enables peptides to be synthesized from amino acids with the participation of trialkylcyanosilanes.The peptides obtained by this synthesis route are used, in particular, in pharmaceutical applications.

Abstract: Polyetherpolyols corresponding to the general formula: ##STR1## in which: Y denotes oxyalkylene radicals derived from alkene oxides,m denotes a number such that 1.ltoreq.m.ltoreq.2 and n.sub.1 and n.sub.2 denote numbers such that 2.ltoreq.(n.sub.1 +n.sub.2).ltoreq.5.The brominated polyetherpolyols are prepared by the condensation of (m+1) moles of 2-butyne-1,4-diol with m moles of epichlorohydrin in the presence of m moles of a strong base, followed by the addition of (n.sub.1 +n.sub.2) moles of alkene oxide and, finally, by a partial bromination.These brominated polyetherpolyols may be employed, by themselves, or mixed with conventional unhalogenated polyetherpolyols, in the manufacture of rigid polyurethane foams.

Abstract: A process for extracting poly-beta-hydroxybutyrates from an aqueous suspension of microorganisms, in which an azeotropic distillation, and an extraction of the polymer by means of the solvent used, are carried out simultaneously.The poly-beta-hydroxybutyrates obtained can be used in medicine.

Abstract: Coating device whose coating vessel is driven simultaneously with a rotary motion on itself around an axis of rotation and with a planetary motion around this axis of rotation. The device makes it possible to coat various products, especially kernels, seed, fruit, confectionery products, dragees, sweets, pharmaceutical products, and the like.

Abstract: Phosphobrominated polyetherpolyols which contain in their molecule oxyalkylene radicals bound to phosphorus atoms in the phosphate or phosphonate state and 1,4-dioxy-2,3-dibromo-2-butylene radicals in which the ratio of the total number of oxyalkylene radicals to the total number of phosphorus atoms is equal to at least 7.These polyetherpolyols can be used as flame-retarding reactive additives in the manufacture of flame-retardant flexible polyurethane foams involving polyetherpolyols, the foams possessing good comfort-conferring properties.

Abstract: The thermoplastic structures incorporate an inner vinylidene chloride copolymer layer, each face of which is bonded to a vinyl chloride polymer (2) layer through the intermediacy of a separate intermediary vinyl chloride polymer (1) layer whose gel temperatrue and dynamic viscosity are lower than those of the adjacent vinyl chloride polymer (2).The thermoplastic structures with multiple coextruded polymeric layers may be in the form of sheets, plaques, tubes or rigid or semirigid hollow bodies, which can be employed in the field of packaging.

Abstract: Copolymers containing oxymethylene and 2-fluoromethoxyethylene repeat units. These copolymers, of improved heat stability, may be prepared by copolymerizing trioxane with a derivative of a cyclic ether whose molecule contains at least two adjacent carbon atoms and in which an oxymethylene group carries a fluoromethyl substituent, especially epifluorohydrin.

Abstract: An adjustable feed block for a coextrusion die is provided. The feed block comprises a main central channel for conveying a main stream of molten thermoplastic material towards a coextrusion die, and at least one secondary channel, substantially parallel to the central channel, for conveying a second molten thermoplastic intended to form a local coating layer on the main stream. The downstream end of each secondary channel is inclined relative to the central channel and connected to a portion of the periphery of the said channel. The connection between the central channel and each secondary channel is laterally delimited by the ends of two adjustable slides which can be moved at right angles to the axis of the central channel. These slides make it possible to adjust, during operation, the position and width of the streams of thermoplastic deposited on the main stream.

Abstract: Apparatus composed of a control and monitoring unit 1, a thermostated cylinder 2 receiving a measured quantity of material to be evaluated, a plunger 3 sliding in the cylinder 2, an exchanger system enabling the cylinder 2 to be equipped with a suitable die 6 for the measurement to be carried out, a stepping-control motor 7 ensuring a monitored travel of the plunger 3, a force-sensor 9 yielding a signal as a function of the force applied to the plunger 3, and an electronic microprocessor system monitoring the stepping motor 7 as a function of the position of the piston and/or of the signal emitted by the force-sensor 9 at the end of the time assigned to the thermal conditioning of the measured quantity to be evaluated, the plunger 3 is situated at a distance from the die 6 permitting the measurement and acts for 10 to 180 seconds on the measured quantity according to a parameter of the speed of travel of the plunger or of the applied force specified by the measurement to be carried out.

Abstract: Baths for chemical polishing of stainless steel surfaces, comprising, in aqueous solution, a mixture of hydrochloric acid, phosphoric acid and nitric acid, ferricyanide complex ions and an additive capable of decomposing nitrous acid.The baths can be used in particular for chemical polishing of heat exchangers with a very large exchange surface.

Abstract: Process for the production of a water-insoluble nitrogeneous organic base, from an aqueous solution of alkali metal bicarbonate and the base hydrochloride, according to which the solution (11) is treated with a complement of the base hydrochloride (12), and the resultant liquid (18) is treated with a basic agent (30) capable of decomposing the hydrochloride. The invention is applied to the regeneration of the amine in the process for the manufacture of sodium bicarbonate by the amines method.

Abstract: Process for inhibiting crust formation in reactors used for polymerising alpha-olefines, such as ethylene and propylene, in the presence of particles of catalytic solids containing titanium and chlorine in the combined state.The polymerisation is carried out in the presence of an amount of a silicone oil which is less than 1% by weight, relative to the weight of catalytic solid.

Abstract: Stabilized against degradation by oxidizing liquids, based on polymers of alpha-olefins such as propylene, containing a phenolic antioxidant, a phosphonite and a sulfur-containing stabilizer chosen from the esters derived from aliphatic polyols and alkylthiodipropionic acids and from combinations of a metal sulfide with one of these esters or with an organic polysulfide and optionally also containing an organic phosphite and an anti-acid agent. These compositions exhibit outstanding resistance to the phenomenon of oxidative degradation produced particularly by the contact with hot washing products of all kinds.

Abstract: Electrically conductive polymers derived from heterocyclic polycyclic monomers formed of at least two cycles of five condensed members, each cycle containing one heteroatom, as well as a method of electrochemical polymerization by anodic oxidation of these monomers. These polymers may become part of composite electroconductive material.

Abstract: The substitution chlorination reactions of organic compounds are carried out by means of molecular chlorine, using, as a radical initiator, decachlorobutane or an octachlorobutane such as octachlorobut-1-ene or a mixture containing these two products.Good degrees of conversion and good yields are obtained at moderate temperatures.The process is, for example, applicable to the substitution chlorination of benzene and of chloroform.

Abstract: The compositions contain biosynthetic pesticidal products originating from microorganisms of the family of Bacillaceae and at least one water-soluble inorganic phosphate.They can be used, if appropriate after dispersion in a liquid, for spraying.