Abstract: Perfluorobutadiene and higher alkandienes, with terminal double bonds, are obtained from .alpha.,.omega.-dibromo, .alpha., .omega.,bromo, iodo perfluoroalkanes by dehalofluorination carried out with the aid of an organometallic compounds, in the presence of aprotic solvent belonging to the class of hydrocarbons or polar aprotic solvent belonging to the class of ethers, with limited reaction times.

Abstract: Perfluoropolyethers having an average molecular weight higher than 390 and respectively having a kinematic viscosity lower than 8.5 cSt (at 20.degree. C.), and such as to distill by not more than 10% at temperatures lower than 140.degree. C., and by at least 90% at temperatures not higher than 260.degree. C., or, in the case in which the perfluoropolyether does not contain CF (CF.sub.3) CF.sub.2 O units, having a viscosity lowr than 18 cSt (at 20.degree. C.), and such as to distill by not more than 10% at temperatures lower than 140.degree.C., and by at elast 90% at temperatures not higher than 280.degree. C., are used as the only high-temperature and low-temperature working fluid in the Thermal Shock Tests to which the electronic components are submitted, and at the same time are advantageously used in other tests used in the electronic industry, such as the Gross Leak Test and the Burn in Test, allowing the operators in this field to use only single fluid for a whole set of uses.

Abstract: The cross-linking or curing of thermosetting resins and of hot curable elastomers is carried out by heating the material or the article comprising the resin (or the elastomer) by saturated vapor of the commercial perfluoropolyether having an average boiling point corresponding to the temperature necessary for the cross-linking and having a point range not exceeding 12.degree. C. (measured according to ASTM D 1078) in the presence of a chlorofluorohydrocarbon secondary vapor.

Abstract: Perfluoropolyethers having an average molecular weight higher than 390 and respectively having a kinematic viscosity lower than 8.5 cSt (at 20.degree. C.), and such as to distill by not more than 10% at temperatures lower than 140.degree. C., and by at least 90% at temperatures not higher than 260.degree. C., or, in the case in which the perfluoropolyether does not contain CF(CF.sub.3)CF.sub.2 O units, having a viscosity lower than 18 cSt (at 20.degree. C.), and such as to distill by not more than 10% at temperatures lower than 140.degree. C., and by at least 90% at temperatures not higher than 280.degree. C., are used as the only high-temperature and low-temperature working fluid in the Thermal Shock Tests to which the electronic components are submitted, and at the same time are advantageously used in other tests used in the electronic industry, such as the Gross Leak Test and the Burn in Test, allowing the operators in this field to use one single fluid for a whole set of uses.

Abstract: The present invention relates to a method for hot curing thermosetting resins and vulcanizable elastomers, based on the use of perfluoropolyethers in the liquid state as heat transfer media.

Abstract: New perfluoroalkanes and haloperfluoroalkanes, having low melting point and high thermal and chemical stability, constituted by preferably branched perfluorinated and haloperfluorinated chains, obtained by starting from precursors containing two halogen atoms equal to or different from each other, one of them necessarily being an iodine atom, which are reacted with C.sub.3 F.sub.6 and possibly subsequently halogenated with either fluorine or chlorine or bromine.

Abstract: Cotelomers of vinylidene fluoride with one or more fluoro olefins, having the general formulaR[(CF.sub.2 CH.sub.2)n (C.sub.3 F.sub.6)m (C.sub.2 F.sub.4)p (C.sub.2 F.sub.3 Cl)q]X (I)wherein:X is either Br or I, R is an alkyl radical eventually containing halogen atoms, n is an integer comprised within the range of from 1 to 30, m is an integer comprised within the range of from 0 to 10, p and q are integers comprised within the range of from 0 to 20, and wherein m+p+q is at least 1, obtained by cotelomerizing monomers in the presence of a telogen RX (wherein R and X have the abovesaid meaning) and of a free-radical polymerization initiator.

Abstract: Oxetane-structure fluids of well-defined composition and free from not completely fluorinated compounds, characterized in that they have at least a perfluoroether chain bound to an oxetane ring, having improved characteristics for special applications, being liquid up to temperatures of at least -70.degree. C., having boiling temperatures in the range of from 50.degree. to 270.degree. C. or higher, and a very high range between the boiling temperature and the pour point.

Abstract: A process for preparing mono- and di-hydroxyfluoroalkanes which comprises reacting in a homogeneous phase the corresponding iodo-fluoroalkanes with water in an organic solvent, completely miscible with water or in which water is soluble for at least 1.7% by weight at 20.degree. C., and in the presence of catalysts comprising one or more transition metal ions, at temperatures ranging from 120.degree. to 280.degree. C.

Abstract: A process for preparing .alpha.,.omega.-dihaloperfluoroalkanes consisting in dihalogenating .alpha.,.omega.-diiodoperfluoroalkanes, or .alpha.,.omega.-chloroiodoperfluoroalkanes or .alpha.,.omega.-bromoiodoperfluoroalkanes with Cl.sub.2 or Br.sub.2.

Abstract: Perfluorobutadiene and higher perfluoroalkadienes, with terminal double bonds, are obtained from .alpha.,.omega.-diiodoperfluoroalkanes by deiodofluorination realized by using an organometallic compound, in the presence either of an aprotic solvent belonging to the class of hydrocarbons, or of an aprotic polar solvent, with short reaction times.

Abstract: Compositions suitable to be used for washing of industrial materials, comprising, by weight:63-99% of 1,1,2-trichloro-1,2,2-trifluoroethane0.5-25% of water0.5-12% of a mixture consisting of 80-97% by weight of a compound of formula (I) and of 20-3% by weight of a compound of formula (II)R--C.sub.6 H.sub.5 --SO.sub.3 H.A (I)wherein:R=an alkyl group C.sub.9 -C.sub.15A=an aliphatic or cyclic amineX--(CO).sub.n --OH (II)wherein:n=0 or 1X=an alkyl or an alkenyl group, C.sub.6 -C.sub.25.

Abstract: A liquid composition based on a fluorinated hydrocarbon solvent, additioned with an amount not exceeding 0.5% by weight of a surfactant consisting of a salt of an aliphatic diamine and of an alkyl-mono- or di-ester of phosphoric acid, such composition being particularly suited to remove water from the surfaces of articles.

Abstract: A new class of fluorosulphonyl oxafluoroalkanes and their derivatives is disclosed as well as a process for preparing said products. Furthermore, a new class of fluorosulphonyl olefins, copolymers thereof and a process for preparing same is also disclosed.

Abstract: A new class of fluorosulphonyl oxafluoroalkanes and their derivatives is disclosed as well as a process for preparing said products. Furthermore, a new class of fluorosulphonyl olefins, copolymers thereof and a process for preparing same is also disclosed.

Abstract: The present invention concerns new propellant compositions for aerosols. More particularly, the propellant compositions of this invention consist of a mixture of one or more propelling hydrocarbon substances selected from the group consisting of propane, n-butane, isobutane, pentane and isopentanes with one or more halogenated organic compounds selected from the group consisting of CBrF.sub.3, CBrClF.sub.2 and CBrF.sub.2 -CBrF.sub.2.

Abstract: A new class fluorosulphonyl oxafluoroalkanes and of their derivatives is disclosed as well as a process for preparing said products. Furthermore, a new class of fluorosulphonyl olefins, copolymers thereof and a process for preparing same is also disclosed.

Abstract: The present invention concerns new propellant compositions for aerosols. More particularly, the present invention relates to propellant compositions for aerosols, characterized in that said compositions consist of a mixture of a chlorofluorocarbon or fluorocarbon (A) containing hydrogen and selected from the group consisting of CHClF.sub.2, CH.sub.2 F.sub.2 and CF.sub.3 --CH.sub.3, with a chlorofluorocarbon or fluorocarbon (B) containing hydrogen and selected from the group consisting of: CH.sub.2 ClF, CClF.sub.2 --CHClF, CF.sub.3 --CHClF, CHF.sub.2 --CClF.sub.2, CHClF--CHF.sub.2, CF.sub.3 --CH.sub.2 --Cl, CHF.sub.2 --CHF.sub.2, CF.sub.3 --CH.sub.2 F, CClF.sub.2 --CH.sub.3 and CHF.sub.2 --CH.sub.3. In addition to propellant A and propellant B, there may be included a hydrocarbon propellant so that a ternary propellant composition is provided.

Abstract: New elastomeric polymers containing, in the chains thereof, perfluoropolyether radicals of linear structure and bound by ether bridges to radicals derived from 1,3,5-triazine are disclosed. The new polymers are obtained by polycondensation of certain glycols or alkaline derivatives thereof with 1,3,5-triazines substituted on the ring by at least two halogen atoms.