Patent ID: 6746620
Filing Date: 2004-06-08
Classification: C09K

Abstract:
A process for heat transfer by utilizing one or more fluorinated liquids as dielectric working fluids in plants or heat transfer circuits comprising parts formed by polymer material in contact with said fluids, said fluorinated liquids having:a boiling point in the range of 50Â° C.-250Â° C. reduced permeability and reduced swelling properties for the polymer materials which contact said fluorinated liquids in a heat transfer apparatus; good dissipation of electrostatic charges generated when said fluorinated dielectric liquids contact non conductive polymer parts of the heat transfer apparatus; and chemical formula Râ€²â€”Rfâ€”Râ€ƒâ€ƒ(I) â€ƒwherein: Râ€²is â€”(O)noâ€”CnF2nH, n being an integer from 1 to 4, n0 is equal to 0 or 1; R is: â€”CnF2nH, or â€”CmF2m+1wherein n is as above defined and m is an integer from 1 to 3: in the end groups R, Râ€² one fluorine atom is optionally substituted with one chlorine atom; R1is: a linear or branched perfluoroalkylene from 2 to 12 carbon atoms, containing at least one ether oxygen atom; when Rf has said meaning n0 in Râ€² is preferably equal to zero; a perfluoropolyoxyalkylene comprising units statistically distributed along the chain, selected from the following: (CFXO) wherein X=F or CF3; (CF2(CF2)dO) wherein d is an integer comprised between 1 and 3; or a unit (C3F6O); when Rf is perfluoropolyoxyalkylene n0 in Râ€² is equal to 1.