Fluoropolymer containing a small amount of bromine-containing olefin units
AssigneeE. I. Du Pont de Nemours and Company
InventorsDavid Apotheker, Paul Joseph Krusic
Life of this patent
Estimating the term…
Abstract
A novel fluoropolymer can be made by copolymerizing a small amount (e.g. about 0.5-3 mole %) of bromotrifluoroethylene or bromotetrafluorobutene with certain combinations of monomers comprising selected fluorine-containing compounds. A fluoropolymer composition useful in the manufacture of cured fluoropolymer articles can be made by mixing the resulting fluoropolymer or a closely related fluoropolymer with an organic peroxide such as a dialkyl peroxide, and preferably also adding a divalent metal oxide and/or hydroxide and a suitable coagent such as triallyl isocyanurate.
Claims12
As a novel fluoropolymer, a copolymer whose interpolymerized units consist essentially of
- a. up to 3 mole %, based on the total moles of components (a) and (b), of units derived from a compound selected from the group:
- bromotrifluoroethylene and 4-bromo-3,3,4,4-tetrafluorobutene-1, with the proviso that enough of such units are present to provide at least 0.05 weight % bromine in the copolymer, and
- b. enough units derived from component (b-1), (b-2) or (b-3) as follows to make up the remainder of the copolymer:
- b-1. tetrafluoroethylene and a perfluoroalkyl perfluorovinyl ether wherein the alkyl group contains 1-5 carbon atoms,
- b-2. about 45-65 mole % of tetrafluoroethylene, about 20-55 mole % of a C.sub.2 -C.sub.4 olefinic hydrocarbon and from 0 to about 30 mole % vinylidene fluoride, or
- b-3. vinylidene fluoride, at least one fluorine-containing olefin copolymerizable therewith, and optionally said perfluoroalkyl perfluorovinyl ether, said olefin being a compound which contains 2-7 carbon atoms, contains no bromine atom, and contains at least as many fluorine atoms as carbon atoms.
Dependencies are inferred from the claim text.