Perfluoropolyethers having mono- and bis-hypofluorite end groups
AssigneeAusimont S.p.A.
InventorsGiuseppe Marchionni, Anna Staccione
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Abstract
Mono- or difunctional perfluoropolyethers with hypofluorite end groups, and a process for preparing them which comprises reacting a perfluoropolyether having at least one fluoroformate end group, or containing a peroxy group --O--CF.sub.2 OO--CF.sub.2 --O--, with fluorine in the liquid phase at a temperature ranging from -60.degree. C. to 30.degree. C., in the presence of UV radiation of a wave-length ranging from 200 to 500 nm.
Claims3
Perfluoropolyethers haing a hypofluorite end group of the formula:
- R.sub.f OCF.sub.2 OF
- where R.sub.f is a perfluoropolyether group selected from the following classes:
- ##STR5## in which A is --CF.sub.3, --C.sub.2 F.sub.5, --C.sub.3 F.sub.7, --CF(CF.sub.3).sub.2, m, r are integers higher than zero and lower than 50, n is an integer from 0 to 50, t, p are integers higher than zero and lower than 200;
- the perfluoroalkylene units indicated above with indexes m, n, r, t and p being randomly distributed along the perfluoropolyether chain.
Perfluoropolyethers having two hypofluorite end groups of the formula:
- FOCF.sub.2 OR'.sub.f CF.sub.2 OF
- wherein R'.sub.f is a perfluoro-oxyalkylene group selected from the following classes:
- ##STR6## in which m, r are integers higher than zero and lower than 50;
- n is an integer higher than or equal to zero and lower than 50;
- t, p are integers higher than zero and lower than 200;
- the perfluorooxyalkylene units with indexes m, n, r, t and p being randomly distributed along the perfluoropolyether chain.
Perfluoropolyethers having hypofluorite end groups, of the formula:
- FOCF.sub.2 (OCF.sub.2 CF.sub.2).sub.t (OCF.sub.2).sub.p OCF.sub.2 OF,
- or
- CF.sub.3 (OCF.sub.2 CF.sub.2).sub.t (OCF.sub.2).sub.p OCF.sub.2 OF
- wherein t and p are integers higher than zero and lower than 200.
Dependencies are inferred from the claim text.