Abstract: The present invention relates to the field of gas-generating pyrotechnic compositions intended for motor vehicle safety.The compositions according to the invention include:an oxygen-containing thermoplastic binder and especially a block aliphatic copolymer of formula: ##STR1## in which: PA is a polyamide block,PE is a polyether block,n is a number between 2 and 10,an energetic plasticizer which is a polyglycidyl azide,an oxidizing charge in which at least 85% of its weight consists of ammonium nitrate.The compositions according to the invention burn without solid residues and can be employed in gas generators without a filter chamber.

Abstract: The present invention relates to low-vulnerability propellent powders for weapons. The powders according to the invention consist of at least one organic nitro compound and an organic binder and are characterized in that they contain at least one additive chosen from the group consisting of lithium fluoride, ammonium fluoride and lithium nitrate, optionally in the presence of acetylene black. The powders according to the invention exhibit good ignition characteristics while retaining low vulnerability to impacts and to thermal shocks.

Abstract: The object of the present invention is novel solid pyrotechnic compositions with a loaded and plasticized thermoplastic binder, which can be used notably as propellants with non-polluting combustion, as propellants with a high combustion rate or as compositions generating non-toxic gases for air-bags.The plasticizer for the binder comprises a polybutadiene having a number average molecular weight of between 1500 and 7500 and having, added to some of its ethylenic non-saturations, silylferrocene groups.

Abstract: The present invention relates to combustible container elements (24) for artillery ammunition.The said elements, obtained by felting, compacting and stoving, have a plane axisymmetric part (2,7), an outer wall (5,10) and an inner neck (4,9) which are integral. Two complementary elements thus make it possible to obtain combustible containers which are easy to charge with loose powder (25) and which present no problem in positioning the central channel since the latter consists of the inner necks (4,9). A complementary combustible ignition tube (26) made of agglomerated powder is advantageously positioned inside the central channel thus defined.The invention also relates to a method of obtaining these elements by using a specially adapted felting mould.

Abstract: The invention pertains to a process to fasten an intrinsic element absorbing electromagnetic waves onto a wall of a structure or infrastructure.The process of the invention consists of coating a surface of a wall of a structure by means of a syntactic foam with the rheologic properties of a mastic and being transparent to electromagnetic waves, then placing an element absorbing electromagnetic waves into or onto the syntactic foam coating, and letting the syntactic foam harden. The process can be used to place an element absorbing electromagnetic waves onto surfaces of any shape and in a simple manner without requiring special equipment.

Abstract: The present invention falls within the sector of infrared or electrogmagnetic decoys for protecting light aircraft or helicopters. It relates more particularly to pyrotechnic cartridges and to ammuniton comprising racks receiving the cartridges. This invention makes it possible, for the same volume of ammunition, to have a larger number of shots and to carry out the loading of the ammunition simply and quickly. The cartridge (1), consists of a sole (2) fixed to a case (3), in which are accommodated a plurality of assemblies (11) comprising pyrotechnical ejection charges (6), pyromechanical assemblies (7), ignition charges (8), effective charges (9) and the caps (10). The case (3) is provided with a plurality of receptacles and comprises at its base either a blocking device (4) or a gasket which is seated in a groove (41).

Abstract: The present invention lies in the field of infra-red decoys for protecting aircraft.It relates more particularly to a stabilized decoy (4, 21) propelled over a trajectory and with directed infra-red emission, comprising a body (22) open over its rear part (24) containing an emissive block (28, 40) made of pyrotechnic substance and an ignition assembly for the said block, characterized in that the said body includes an ogive (23) at its front part and has an aperture of constant cross-section at its rear part (24), in that the ignition assembly comprises an ejectable pyromechanical device (6, 26) situated at the rear of the said body and an ignition charge (29) situated at the front of the said body and in that the said emissive block (28, 40) has at least one channel and is placed between the ignition charge (29) and the ejectable pyromechanical device (6, 26).FIG.

Abstract: The invention concerns a process for the preparation of acyl isocyanates which consists of reacting oxalyl chloride with a salt selected from the group consisting of hydrohalides and sulphates of carboxamides and/or carbamates, unsubstituted on nitrogen, then heating the reaction mixture at a temperature between 30.degree. and 150.degree. C. The process is suitable for preparation of acyl isocyanates with excellent yields in easy to control operational conditions.

Abstract: In the field of infrared or electromagnetic decoys for protecting light aircraft or helicopters, pyrotechnic cartridges and ammunition comprising racks receiving the cartridges are described. Thus it is possible for the same volume of ammunition to have a larger number of shots and to carry out the loading of the ammunition simply and quickly. The cartridge (1) consists of a sole (2) fixed to a case (3), in which are accommodated a plurality of assemblies (11) comprising pyrotechnical ejection charges (6), pyromechanical assemblies (7), ignition charges (8), effective charges (9) and the caps (10). The case (3) is provided with a plurality of receptacles and comprises at its base a blocking device (4). The assemblies (11) are independent and are arranged in parallel in the various receptacles of the case (3); the sole (2) is common to the various receptacles of the case (3) and is provided with electrical fuses.

Abstract: The subject of the invention is a process for the production of coatings by radiation crosslinking of compositions containing a resin which can be cured by the polymerization of the double bonds >C.dbd.CH.sub.2 and a reactive diluent system containing at least one reactive diluent corresponding to the general formula (I) ##STR1## in which R.sub.1 =H, CH.sub.3,R.sub.2 and R.sub.3 =H, C.sub.1 -C.sub.4 -alkyl chain or form an alkylene ring containing 5 or 6 carbon atoms,R.sub.4 =H, C.sub.1 -C.sub.4 -alkyl chain, phenyl,R.sub.5 =C.sub.1 -C.sub.10 aliphatic chain, C.sub.5 -C.sub.6 alicyclic chain, or C.sub.1 -C.sub.4 alkyl chain substituted with an aryl or aromatic heterocyclic group,or R.sub.4 and R.sub.5 form a 5- or 6-membered ring.One preferred compound (I) is to the acrylate of isopropyl beta-hydroxyethylcarbamate.

Abstract: Silica-based substrate surface-modified by grafting covalent links of organic polysubstituted guanidinium groups, and preferably polyakylguanidinium groups. These substrates can be obtained by reacting silica with a polyalkylguanidinium anion, the silanol residual groups of silica being optionally treated with hexamethyldisilazane to stabilize the substrates. These substrates can be used as chlorination and esterification catalysts.

Abstract: Apparatus and continuous process for impregnating fibers with polymer powders in which the fibers are caused to circulate in an aerosol passed through a fluidized bed contained in an earthed fluidization vessel. The particles constituting the fluidized bed are chosen so as to charge the powder particles electrostatically. The aerosol is continuously fed with a flow of fresh powder particles equal to that at which it is desired to impregnate the fibers per unit time and all the powder particles previously introduced which have not been impregnated into the fibers are continuously reintroduced into the fluidized bed without any change in the supply flow rate of fresh powder particles.

Abstract: The present invention lies in the field of nitrocellulose nail varnishes and its subject is the use of an arylsulphonylurethane as film forming resin in these varnishes, which makes it possible in particular to avoid the release of formaldehyde, a carcinogenic compound which is formed when an arylsulphonamide-formaldehyde resin is employed.Another subject of the invention is new poly(arylsulphonylurethanes) containing from 2 to 5 arylsulphonylurethane groups and possessing a molecular mass of between 450 and 1500.

Abstract: Destructible cores useful particularly for shaping the internal channels of cast propellant blocks. The cores include at least one elongated element which is shaped, for example by winding, the cohesion of which is ensured by way of a joining material and a portion of which is accessible from the exterior of the component to be cast. In order to obtain quickly cores having a high rigidity, the shaped element is a band which includes interlaced wires having free spaces, the joining material filling the free spaces.

Abstract: Process for obtaining aryl esters by O-dealkylation of an alkyl aryl ether with an acyl halide in the presence of a catalyst chosen from hexaalkylguanidinium salts and tetraalkylphosphonium salts.The alkyl aryl ether corresponds preferentially to the formula Ar(OR).sub.n in which R denotes an alkyl group, in particular a methyl group, n is an integer from 1 to 6 and Ar represents a C.sub.6 to C.sub.14 aromatic radical, a coumarinyl group or a group of a number of phenyl radicals.This process allows also the obtention of aromatic polyester.

Abstract: Cartridge case member with a combustible tube, ammunition with a semicombustible cartridge case incorporating this member and process for filling this ammunition.The present invention relates to the field of combustible ammunition and relates more particularly to that of dart-shell semicombustible ammunition.The invention relates to a cartridge case member (3) with a combustible tube (6) comprising a bottom (7) which has a central opening (8) and a side opening (9). A hollow component (4) enters the said member (3) through the central opening (8) without obstructing the side opening (9). This hollow component (4) is a shell of revolution which comprises, over its entire height, a central cavity on the wall of which are arranged means (18) for fastening a separate component.The invention also relates to semicombustible ammunition (1) comprising a member (3) according to the invention.

Abstract: The present invention relates to propellent powders in multi-perforated sticks (1) divided by radial slits (7) cutting the peripheral channels (6) of the stick (1) but allowing a continuous cover (8) to remain around its central channel (5). The invention also relates to equipment for obtaining such sticks, comprising:--a drive shaft (17) carrying circular cutting members (18),--a positioning shaft (19) carrying rollers (20) and a thrust shaft (21) carrying rollers (22). The sticks (1) advantageously constitute bundles for artillery ammunition which divide up into elementary particles at the moment of firing.

Abstract: Cartridge case member with a combustible tube, ammunition with a semicombustible cartridge case incorporating this member and process for filling this ammunition.The present invention relates to the field of combustible ammunition and relates more particularly to that of dart-shell semicombustible ammunition.The invention relates to a cartridge case member (3) with a combustible tube (6) comprising a bottom (7) which has a central opening (8) and a side opening (9). A hollow component (4) enters the said member (3) through the central opening (8) without obstructing the side opening (9). This hollow component (4) is a shell of revolution which comprises, over its entire height, a central cavity on the wall of which are arranged means (18) for fastening a separate component.The invention also relates to semicombustible ammunition (1) comprising a member (3) according to the invention.

Abstract: The present invention relates to an effective and explosive munition component of low vulnerability, consisting of a casing 1 containing an explosive charge consisting of an internal layer 2 made of plastic bonded explosive in which the filler contains at least one organic nitrated explosive, coated with a peripheral adjacent coaxial layer 3 made of less sensitive pyrotechnic composition consisting of a filled polymeric matrix in which the filler contains at least one inorganic oxidizing agent or an organic nitrated explosive.The interface between the two layers 2 and 3 is of star-shaped cross-section.The invention also relates to the process for obtaining a fragmentation effect by detonation of the layer 2, reaction of the layer 3 followed by bursting of the casing due to the pressure of the gases formed.

Abstract: The present invention relates to a process for the synthesis of a monohaloalkylferrocene by reaction of hydrogen with a monohaloalkanoylferrocene in the presence of PtO.sub.2 and SnCl.sub.2 as catalyst in an acetic acid medium.In this manner, a crude, particularly pure synthetic product is obtained in a high yield, simply and inexpensively.The monohaloalkylferrocenes are especially useful as surfactants or as intermediates for the synthesis of combustion catalysts for propergols.The present invention also relates to a novel monohaloalkylferrocene, namely 4-chlorobutylferrocene.