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Abstract

1) Disclosed herein are new fluorine-containing compounds having polyacetalic structure, of general formula: [Rf.sub.m --CH.sub.2 O(CH.sub.2 O).sub.c --CH.sub.2 --.brket close-st..sub.n (I) where: Rf=a perfluorooxyalkylene chain having Mn 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 polycondensation of diols having formula: HORfOH (II) 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 x.sub.n from 2 to about 20) or polymeric compounds (x.sub.n from about 20 to about 100). They exhibit a high stability to heat and to chemical agents, and Tg values slightly different from the ones of the diols utilized for preparing them.

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