Abstract: The invention relates to polyurethanes comprising polyoxyperfluoroalkylene blocks of rubber-like nature and rigid segments derived from short-chain aliphatic diols, optionally from aliphatic diamines, and from aliphatic or cycloaliphatic or aromatic diisocyanate. The number of the rigid-type segments is equal to or greater than the number of the polyoxyperfluoroalkylene blocks. The polyurethane are characterized by a glass transition temperature lower than -80.degree. C., a tensile strength greater than 30 kg/cm.sup.2, a hardness between 50 Shore A and 75 Shore D, and good thermoforming characteristics.

Abstract: The present invention relates to the synthesis of new terminal olefins, perfluoro 2,4-dimethyl 3-ethylpentene and perfluoro 2-isopropyl 3,3-dimethylbutene, and to the subsequent fluorination thereof in order to obtain highly branched perfluoroalkanes, capable of providing perfluoroalkyl radicals, which are utilizable as initiators for the polymerization of ethylenically unsaturated monomers.

Abstract: A solvent composition is taught which comprises chlorofluorocarbons, ethanol, nitroalkane and phosphoric esters. This composition is suited to clean printed circuits at room temperature.

Abstract: A process for preparing bromodifluoroacetylfluoride characterized in that a gaseous stream of oxygen-diluted ozone is reacted, at temperatures ranging from -100.degree. C. to +80.degree. C., with 1,4-dibromohexafluorobutene-2 optionally dissolved in a solvent which is inert under the reaction conditions, with consequent obtainment of the corresponding ozonide and, subsequently, the ozonide is subjected to a heat treatment at temperatures ranging from 100.degree. to 300.degree. C., with consequent obtainment of bromodifluoroacetylfluoride.

Abstract: A process for preparing fluorinated compounds belonging to the classes:XH--Y--CZ.sub.1 Z.sub.2 -(CF.sub.2).sub.n F (I)andYH--X--(CF.sub.2).sub.n --CZ.sub.1 Z.sub.2 F (II)wherein:X is NR.sub.x, O, S, CFR.sub.x, C(R.sub.x).sub.2, or CF.sub.2 ;Y is NR.sub.x, O, S, CFR.sub.x, C(R.sub.x).sub.2, or CF.sub.2 ;X is different from Y;R.sub.x is a perhalogenated alkyl group, containing from 1 to 4 carbon atoms;n is either 0 or 1;Z.sub.1 and Z.sub.2, which may be either equal to, or different from, each other, represent F, Cl, Br, H or R.sub.x.The process is characterized in that a fluorinated cyclic compound of the formula: ##STR1## is reacted, at a temperature within the range of from -80.degree. to +300.degree., with HF in the presence of a Lewis acid. Some of the so-obtained compounds per se are novel.

Abstract: The invention relates to microemulsions of the water-in-oil type (w/o) capable of effecting ionic electric transfer and material interphase transfer, wherein the oily phase consists of a perfluoropolyether having perfluoroalkyl end groups or functional end groups of the hydrophilic type. The microemulsions are obtained using perfluorinated surfactants, in particular having a perfluoroalkylpolyethereal structure, and/or an alcohol as a co-surfactant.

Abstract: Perfluoro-oxaziridines, characterized by the presence of an aminic group in position 3 of the oxaziridine ring, of the formula: ##STR1## wherein each R is independently either F or a perfluoro-alkyl group, and a process for their preparation, consisting in reacting the corresponding perfluoroimine with H.sub.2 O.sub.2, in the presence of a base in a dipolar aprotic solvent.

Abstract: New chlorotrifluoroethylene telomers and process for preparing them. Chlorotrifluoroethylene is reacted, at a temperature ranging from -100.degree. to +40.degree. C., with a fluoroxy compound of formula R.sub.x --CF.sub.2 OF, wherein R.sub.x represents among others a perhalogenated alkyl radical containing from 1 to 10 carbon atoms. There are obtained telomer mixtures having, among others, the following formulae: R.sub.x --CF.sub.2 --O--(M).sub.n --F; R.sub.x --CF.sub.2 --O--(M).sub.n --O--CF.sub.2 --R.sub.x ; R.sub.x --(M).sub.n --F; R.sub.x (M).sub.n --R.sub.x ; R.sub.x --CF.sub.2 --O--(M).sub.n --R.sub.x and F--(M).sub.n --F; wherein M is CF.sub.2 --CFCL and "N" ranges from 2 to 20. Most of these telomers are new compounds.

Abstract: Protecting marble, stone, tiles, cement, and analogous materials utilized in the building industry, from the action of atmospheric agents and pollutants, by applying onto the surface thereof a microemulsion of perfluoropolyethers, optionally provided at one end or at both ends or in the chain with functional groups capable of acting as anchoring agents to the substrate.

Abstract: The invention relates to a process for preparing methacrylates of fluorinated alcohols, which consists in reacting said alcohols with an excess of methacrylic acid in the presence of phosphoric anhydride, which acts as a catalyst and absorbs the water which has formed. The process is applicable to primary, secondary and tertiary fluorinated alcohols and to alcohols and diols with perfluoroethereal chains.

Abstract: Perfluoropolyethers having antirust properties, suitable for being used as lubricating oils or as components of lubricating greases or as antirust additives for lubricating oils and greases based on perfluoropolyethers.

Abstract: Improved process for producing perfluoropolyethers prevailingly constituted by repeating units--CF.sub.2 CF.sub.2 O--and ##STR1## with perfluoroalkyl terminal groups, wiith a mutual ratio of the above C.sub.3 /C.sub.2 units comprised within the range of from 0.2 to 6, endowed with an optimum combination of chemical-physical properties, prepared by means of a process of photo-oxidation of C.sub.3 F.sub.6 +C.sub.2 F.sub.4, under controlled conditions.

Abstract: Preparing fluorinated conjugated olefinic products having, among others, the formulae:R.sub.x O--(CF.dbd.CF).sub.m --F (A)R.sub.x O--(CF.dbd.CF).sub.m --OR.sub.x (B)F--(CF.dbd.CF).sub.m --F (C)andR.sub.y --(CF.dbd.CF).sub.m --F (D)wherein:R.sub.x and R.sub.y represent, among others, a perhalogenated alkyl radical containing from 1 to 10 carbon atoms in the case of R.sub.x and from 1 to 9 carbon atoms in the case of R.sub.y, andm is a numeral in the range of from 2 to 10.These olefinic products are obtained by reacting telomeric products having, among others, the formulae:R.sub.x O--(CFCl--CFCl).sub.m --FR.sub.x O--(CFCl--CFCkl).sub.m --OR.sub.xF--(CFCl--CFCl).sub.m --F, andR.sub.y --(CFCl--CFCl).sub.m --Fwith zinc powder, at temperatures within the range of from 40.degree. C. up to 160.degree. C., in an organic solvent selected from among alcohols, dimethylformide and dimethylsulfoxide. Many of these products, among which those corresponding to formulae (A), (B) and (D), are new.

Abstract: Pyridine-3-peroxycarboxylic acid monopersulfate is herein disclosed, which has the formula: ##STR1## The process for its preparation and its use as bleaching agent.

Abstract: Segmented thermoplastic copolyesters having elastomeric properties, containing from 25% to 80% by weight of short-chain polyester units derived from dicarboxylic acids and a diol, and from 20 to 70% by weight of long-chain polyester units derived from dicarboxylic acids and poly(alkylene oxide)-glycols in which at least 10% by weight of the poly-(alkylene oxide)-glycols has a molecular weight lower than 300, and a C/O ratio within the range of from 1.8 to 4.3.

Abstract: An electrochemical process, in which a gaseous matter is reduced at the cathode and in which microemulsions of the oil-in-water (o/w) type are utilized as catholytes, the microemulsions having ionic electric transfer and matter interphase transfer capacities, and in which the oil phase consists of a perfluoropolyether having perfluoroalkyl end groups or functional end groups of the hydrophilic type, or of perfluorocarbons, the microemulsions being obtained by the use of perfluorinated surfactants, in particular those having a perfluoroalkylpolyether structure and/or by the use of an alcohol as a co-surfactant.

Abstract: The surfaces of stony materials, tiles, cement conglomerates and relevant manufactured articles are protected from atmospheric agents and pollutants by surface application of a protective material consisting of a mixture comprising a vinylidene fluoride polymer or copolymer containing 55-100 mol % of vinylidene fluoride, 0-45 mole % of hexafluoropropene and 0-30 mol % of tetrafluoroethylene and an aqueous microemulsion or emulsion of perfluoropolyethers. Such mixtures are applied by conventional methods onto the surface to be protected.

Abstract: The present invention relates to new perfluoroalkyl halides and to their preparation by a process based on the thermodecomposition of perfluorocarbides in the presence of Cl.sub.2, Br.sub.2 and I.sub.2.

Abstract: A process for preparing a high-density and, low-silica catalyst, supported on a siliceous matrix, based on vanadium, oxygen and alkali metals, wherein the V.sub.2 O.sub.5 content ranges from 6 to 9% by weight, the K.sub.2 O content ranges from 8.5 to 12% by weight and the particle density ranges from 0.90 to 1.40 g/cm.sup.3 and wherein furthermore:the volume of the pores is from 0.30 to 0.70 cm.sup.3 /g and the surface area is from 0.30 to 3 m.sup.2 /g, the average radius of the pores being from 650 to 2200 nanometers;the SiO.sub.2 content is equal to or lower than 75% by weight and the Fe.sub.2 O.sub.3 content is equal to or greater than 0.90% by weight.

Abstract: Protecting marble, stone, tiles, cement and analogous materials, utilized in the building industry, from the action of atmospheric agents and pollutants, by applying to the surface of the material an emulsion of perfluoropolyethers, optionally having at one end or at both ends or in the chain functional groups capable of acting as anchoring agents to the substrate.