摘要:
Fluoroelastomers comprising in the polymer chain units deriving from fluorovinylethers having the formula:CFX=CXOCF 2 OR wherein R is a C 2 -C 6 linear, branched or C 5 -C 6 cyclic (per) fluoroalkyl group, or a C 2 -C 6 linear, branched (per)fluoro oxyalkyl group containing from one to three oxygen atoms; when R is fluoroalkyl or fluorooxyalkyl group as above defined, it can contain from 1 to 2 atoms, equal or different, selected from the following: H, Cl, Br, I; X = F, H.
摘要:
Fluorovinylethers having the formula CFX=CXOCF 2 OR, wherein R is a C 2 -C 6 linear, branched or C 5 -C 6 cyclic (per)fluoroalkyl group, or a C 2 -C 6 linear, branched (per)fluoro oxyalkyl group containing from one to three oxygen atoms; when R is fluoroalkyl or fluorooxyalkyl group as above defined, it can contain from 1 to 2 atoms, equal or different, selected from the following: H, Cl, Br, I; X = F, H; and homopolymers or polymers obtainable polymerizing said fluorovinylethers with at least another polymerizable monomer.
摘要:
New phosphazene derivatives, fully substituted by aromatic groups and perfluoropolyethereal chains, are utilized as stabilizers for oils and greases based on perfluoropolyethers. Such derivatives inhibit the degradation process affecting the perfluoropolyethereal chains when these are subjected to high temperatures in an oxidizing atmosphere and in the presence of metals, such as for example aluminium, titanium, vanadium and their alloys, or steels.
摘要:
The invention relates to a process for preparing perhalogenated olefins which comprises reacting a perhalogenated alkane, having at least one atom of a halogen different from fluorine, with a tris-dialkylamino phosphine at temperature not higher than 60°C.
摘要:
A process for preparing 1,3-dioxolanes of formula:
wherein; X₁, X₂, X₃ and X₄, like or different from one another, represent F, Cl, Br, I, CF₂OSO₂F, SO₂F, C(O)F, H, perhaloalkyl or oxyperhaloalkyl radicals containing from 1 to 5 carhon atoms, X₅ and X₆, like or different from each other, represent F or CF₃. Said process is characterized in that a bis(fluoroxy)perfluoroalkane is reacted, at a temperature ranging from -140°C to +60°C, with a halogenated olefin. New 1,3-dioxolanes of formula (I) belonging to the class defined hereinbefore.
摘要:
Perfluoro-4-alkyl-1,3-dioxoles having the general formula wherein R f is a perfluoroalkylic radical having from 1 to 5 carbon atoms, allow to prepare copolymers with Tg higher than those of the copolymers containing the same molar percentage of fluorinated dioxoles of the art.