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US 5,900,500 AGranted
Perfluoropolyethers having polycarbonate structure
AssigneeAusimont S.p.A.
InventorsStefano Turri, Marinella Levi, Claudio Tonelli, Ferdinando Danusso
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Abstract
Perfluoropolyethereal compounds having polycarbonate structure, and general formula: ##STR1## wherein c is an integer comprised between 0 and 10, preferably between 0 and 3, n is an integer from 2 to 1,000, extremes included, Rf is a poly-fluorooxyalkylenic chain, having number average molecular weight (Mn) comprised between 500 and 10,000.
Claims16
Perfluoropolyethereal compounds having polycarbonate structure, and general formula:
- ##STR4## wherein c is an integer of between 0 and 10, preferably between 0 and 3,
- n is an integer from 2 to 1,000, extremes included,
- Rf is a poly-fluorooxyalkylenic chain, having number average molecular weight (Mn) of between 500 and 10,000, having repeating units of at least one of the following structures, randomly distributed in the chain:
- (CFXO), (CF.sub.2 CF.sub.2 O), (CF.sub.2 CF.sub.2 CF.sub.2 O), (CF.sub.2 CF.sub.2 CF.sub.2 CF.sub.2 O), (CR.sub.4 R.sub.5 CF.sub.2 CF.sub.2 O), CF(CF.sub.3)CF.sub.2 O), (CF.sub.2 CF(CF.sub.3)O),
- wherein
- X=F, CF.sub.3 ;
- R.sub.4 and R.sub.5, equal to or different from each other, are selected from H, Cl, or perfluoroalkyl from 1 to 4 carbon atoms.
4 more elements
Dependencies are inferred from the claim text.