Abstract: A composite material the characteristics of which can be modulated by preimpregnation of a continuous fiber.It is characterized in that it is comprised of a sheath and a core consisting of continuous fibers, a powder and a filler the melting temperature of which is higher than at least the highest melting temperature of the other constituents of the material.Applicable notably in the radioelectric fields and to radomes in particular.

Abstract: A halocarbon product made from the reaction of excess hydrogen fluoride with a halocarbon, containing excess hydrogen fluoride as an azeotrope is purified by fluorination in the presence of additional halocarbon or halo-olefin.

Abstract: Hot water and superheated steam resistant barrier films, well adopted as packaging materials, e.g., for perishable comestibles, notably foodstuffs, at least in part include at least one layer of a polymer alloy comprising (a) at least one ethylene-vinyl alcohol (EVOH) copolymer, (b) at least one polypropylene and (c) a compatibilizing amount of at least one compatibilizing agent therefor.

Abstract: An electrochromic element useful in an electrochromic glass or mirror device and a process for making such element. The element is a five-layered structure including an electrolyte ion conducting layer interposed between first and second inorganic electrochromic layers which are interposed between a pair of conductive electrodes. The second inorganic electrochromic layer is amorphous. The first and second inorganic electrochromic layers are different and are capable of exhibiting color-forming properties complementary to one another upon the incorporation of at least one H, Li, Na, K, Ag, Cu or Tl ion. The electrolyte ion conducting layer may be a copolymer of ethylene oxide, butylene oxide or methyl glycidyl ether, and optionally a small amount of allyl glycidyl ether, along with an ionizable salt, or may be a polyurethane gel formed by reacting the copolymer with triisocyanate, along with an ionizable salt.

Abstract: This invention relates to procedures for preparing novel reactive amino or hydrazino peroxides (hereinafter generally referred to as "AHP's") and derivatives all having a Structure A: ##STR1## in which the definitions of P, R11, R22, X, Q and x, y and z are given in the Summary Of The Invention section, for example, 4,4-di-(t-butylperoxy)pentanohydrazide (I-1), and the use of these novel compounds in curing unsaturated polyester resins, in initiating polynerization of ethylenically unsaturated monomers, for modifying rheology, for crosslinking and curing olefin polymers and elastoiners, for producing novel graft and block copolymers, and for producing novel polymers with covalently bound performance additive functions.

Abstract: In the etching and deoxidizing of aluminum, suppression of aluminum oxyfluoride crystal formation by the incorporation of phosphoric acid into an etchant/deoxidizer solution containing water, ferric sulfate, nitric acid, and HF or fluoride salts.

Abstract: Novel high viscosity polyhydrosilazanes containing recurring structural units of the formula: ##STR1## are prepared by reacting a halosilane with ammonia and/or an amine, and then reacting the ammonolysate thus produced with a hydrazine compound.

Abstract: (Co)polymer particulates soluble in their corresponding (co)monomer composition, e.g., particulates of acrylic, methacrylic or styrene polymers, are produced by finely dispersing an aqueous phase including at least one polymerization initiator in an organic phase which comprises such (co)monomer composition and at least one nonsolvent for such (co)polymer which is miscible with such (co)monomer composition, and suspended emulsion polymerizing such mixed-phase polymerization recipe.

Abstract: A process and apparatus for regenerating a plating bath comprising trivalent chromium cations (a trivalent chromium bath). The bath can be continuously, or more preferably, periodically with an ion exchange resin, preferably a cation exchange resin. A useful apparatus comprises a plating tank containing a trivalent chromium plating bath in communication with an ion exchange bed continuing ion exchange resin.

Abstract: To replace the cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention proposes a composition comprising, on a weight basis, 60 to 90% of 1,1-dichloro-1-fluoroethane (F141b), 9 to 33% of 1,1,1,3,3-pentafluorobutane (F365 mfc) and 1 to 7% of methanol. These three compounds form a positive azeotrope (b.p.=29.1.degree. C. at normal pressure).The composition, optionally stabilized, can be employed for the cleaning and/or drying of solid surfaces, in particular for the defluxing of printed circuits and for the degreasing of mechanical components.

Abstract: To replace cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention proposes a composition comprising, by weight, 93 to 99% of 1,1,1,3,3-pentafluorobutane (F365 mfc) and 7 to 1% of methanol. These two compounds form a positive azeotrope (b.p.=36.5.degree. C. at normal pressure).The composition, optionally stabilized, can be used for the cleaning and/or drying of solid surfaces, in particular for the removal of flux from printed circuits and for degreasing mechanical parts.

Abstract: The invention relates to a continuous process for the preparation of perfluoroalkyl iodides containing from 4 to 12 carbon atoms by thermal telomerization of tetrafluoroethylene by pentafluoroethyl iodide or heptafluoroisopropyl iodide in a tubular reactor.According to the invention, 30 to 75% of the tetrafluoroethylene is supplied at the head of the reactor; the remainder is introduced at a point in the reactor located between the 2/5 and 3/4 of the length of the tube.The proportion of undesirable heavy telomers is reduced in this way.

Abstract: An agent is provided which renders compatible at least two incompatible thermoplastic polymers. The agent contains one di- or trisequenced copolymer comprising at least one N-vinyl pyrrolidone or methyl (meth) acrylate telomer and one mono- or difunctional oligomer selected from the group consisting of an ethylenically unsaturated polymerizable monomer, or a polycondensable monomer, or a lactam. The agent is prepared by condensation of the telomer with the oligomer and is used in the preparation of alloys of incompatible thermoplastic polymers.

Abstract: This system for priming the animic polymerization of (meth)acrylates includes at least one primer of the formula R--M (I) in which M represents a metal selected from alkaline and alkaline earth metals and R represents an alkyl radical with a straight or branched chain containing 2 to 6 atoms of carbon or an aryl radical or an arylalkyl radical. H is characterized in that it further contains at least one organic derivative of an alkaline metal, with the proviso that said organic derivative is neither an alcoholate nor a carboxyl acid ester substituted in position .alpha. by said metal. Applications in the anionic polymerization of (meth)acrylates.

Abstract: Triblock copolymers containing a copolymer having a number-average molecular weight of from 3,000 to 300,000, a molecular weight polydispersity of from 1.05 to 2.0, and an A-B-C structure in which each of the blocks A and C may be a monomer sequence chosen from an acrylic, a vinylaromatic, a methacrylic or a maleimide monomer, and block B may be a monomer sequence chosen from an acrylic, a vinylaromatic or a methacrylic monomer, where at least one of the blocks A and C is different than block B.

Abstract: A process is disclosed for the preparation of unsymmetrical dialkyl trisulfides by the reaction of dialkyl trisulfides and olefins in the presence of an acidic-type catalyst whereby alkyl groups are exchanged. Novel mixtures of symmetrical and unsymmetrical dialkyl trisulfides are also disclosed.

Abstract: In the process of removing heavy metals from aqueous solutions by precipitation of a salt thereof at increased pH, multiple stage precipitation by upward stepwise pH adjustment and solid separation at each stage is used to facilitate the manufacture of a product of high purity.

Abstract: The sodium fluoroalcoholates are prepared under conditions resulting in neither reactant nor final product degradation, by (a) reacting, under reflux, the corresponding fluoroalcohols, e.g., the mono-, di- or trifluoroethanols, with sodium methanolate in the presence of a solvent having a boiling point higher than that of methanol and/or a solvent which forms an azeotrope with methanol, and (b) selectively trapping the methanol of reaction, e.g., in a molecular sieve, as it is released into the vapors which evolve upon refluxing the step (a) reaction mixture; the sodium fluoroalcoholates thus produced are well suited for direct reaction with polydichlorophosphazenes.

Abstract: Films of thermoplastic polyurethanes (TPU) with a Shore hardness of 75 A to 92 A having 5 to 20% by weight of polyether amide block copolymers and/or polyether ester block copolymers, and their use for adhering to other substrates, particularly for back-foaming with polyurethane foam. The invention also relates to the use of an addition of 5 to 20% by weight of polyether amide block copolymers and/or polyether ester block copolymers to thermoplastic polyurethanes with Shore hardnesses of 75 A to 92 A, based on the weight of the thermoplastic polyurethanes, for decreasing the adhesion and/or interlocking of thermoplastic polyurethanes produced by single layer blown extrusion technique.

Abstract: Azines, well suited for hydrolysis into hydrazine, are prepared in high yields by reacting ammonia, aqueous hydrogen peroxide and a carbonyl compound reactant in the presence of a catalytically effective amount of a catalyst medium therefor, i.e., an aqueous solution of ammonium acetate and acetamide or of acetamide and acetic acid, but in the absence of CO.sub.2.