Ausimont S.p.a.

Montedison S.p.a.

Other

Montefluos S.p.a.

Gianangelo Bargigia

Gerardo Caporiccio

Claudio Tonelli

Vito Tortelli

Luciano Flabbi

Giuliano Carniselli

Giampiero Guidetti

Giuseppe Marchionni

Alberto Re

Silvana Modena

Ken Johns

Giovanni Moggi

Padmanabhan Srinivasan

Mauro Scapin

Alberto Fontana

Luigi Corbelli

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.

Perfluoropolyethers used as fluids for testing in electronic field

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.

Process for the synthesis of perfluoroalkandienes

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.

Cross-linking of thermosetting resins by means of heating with saturated

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.

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.

Process for curing thermosetting resins by means of a liquid heat

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.

Perfluoroalkanes and haloperfluoroalkanes, their percursors and process

Cotelomers of vinylidene fluoride with one or more fluoro olefins, having the general formula

Cotelomers of vinilydene fluoride with fluorinated olefins and process

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.

Fluids having an oxetane structure and improved characteristics for

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.

Process for the synthesis of mono- di-hydroxyfluoro-alkanes

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.

Process for preparing alpha, omega-haloperfluoroalkanes

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.

Process for the synthesis of hexafluorobutadiene and of higher

Compositions suitable to be used for washing of industrial materials, comprising, by weight:

Compositions based on 1,1,2-trichlorotrifluoroethane for industrial

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.

Composition based on a fluorohydrocarbon solvent, suitable for removing

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.

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Milan, Italy

Gianangelo Bargigia