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US 8,940,944 B2Granted
Fluoroelastomers
AssigneeSolvay Solexis S.p.A.
InventorsMarco Apostolo, Francesco Triulzi, Vito Tortelli, Marco Galimberti
Life of this patent
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Abstract
VDF-based curable fluoroelastomers having glass transition temperature lower than −35° C. and an amount of —COF end groups in the polymer lower than the sensitivity limit of the method using the FT-IR spectroscopy described in the present application.
Claims17
A process to obtain the monomer CF3OCF2OCF═CF2 comprising the following steps:
- I obtainment of the fluoroformate CF3OCOF;
- II reaction of the fluoroformate CF3OCOF with elemental fluorine and olefinic compounds having formula:
- CAF═CA′F (IV)
- for obtaining the fluorohalogenether of formula
- CF3OCF2OCFACF2A′ (V)
- wherein A and A′, equal to or different the one from the other, are H, Cl or Br, with the proviso that both are not H;
- the temperature being between −120° C. and −20° C.;
- III removal of the substituents A and A′ from the fluorohalogenether (V).
5 more elements
Dependencies are inferred from the claim text.