NEW FLUORINE-CONTAINING COMPOUNDS HAVING POLYACETALIC STRUCTURE, AND PROCESS FOR PREPARING THEM

摘要

NEW FLUORINE-CONTAINING COMPOUNDS HAVING POLYACETALIC STRUCTURE, AND PROCESS FOR PREPARING THEM 1) New fluorine-containing compounds having polyacetalic structure, of general formula: (I) where: Rf = a perfluorooxyalkylene chain having ?n from 500 to 5,000; m = 4 - 25; c = 1 - 10; n = 2 - 100. 2) A process for preparing them, which comprises carrying out the polycondens ation of diols having formula: (II) HORfOH with formaldehyde, in mass or in the presence of solvents, in an acid medium. The compounds of formula (I) can be oligomeric compounds (polymerization degree ?nfrom 2 to about 20) or polymeric compounds (?nfrom about 20 to about 100). They exhibit a high stability to heat and to chemical agents, and Tg values slight ly different from the ones of the diols utilized for preparing them.