Fluoroelastomer blend composition
AssigneeE. I. Du Pont de Nemours and Company
InventorNicolas Brodoway
Life of this patent
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Abstract
A fluoroelastomer composition which is very useful for the manufacture of cured fluoroelastomer articles having desirable chemical and heat resistance combined with excellent low temperature flexibility can be prepared by blending specified amounts of the following: (A) an elastomeric copolymer of tetrafluoroethylene, a perfluoroalkyl perfluorovinyl ether and a bromine-containing olefin and (B) a certain fluoropolymer having perfluoroalkyl end groups containing an iodine atom; and when making the cured articles, it also preferred to add (C) an organic peroxide curing agent, (D) a co-curing agent such as triallyl isocyanurate and (E) a suitable metal compound such as a divalent metal oxide or hydroxide.
Claims17
A fluoroelastomer composition which comprises
- A. an elastomeric copolymer of
- tetrafluoroethylene,
- a perfluoroalkyl perfluorovinyl ether wherein the alkyl group contains 1-5 carbon atoms, and
- a bromine-containing olefin in an amount such that said copolymer has a bromine content of about 0.3--3.0 % by weight,
- the tetrafluoroethylene/vinyl ether molar ratio being about 50/50 to 80/20, and
- B. a polymer of the structure ##EQU1## wherein R'.sub.f and R".sub.f are perfluoroalkyl groups, at least one of which contains an iodine atom in place of a fluorine atom, and m and p are whole numbers, the sum of which is about 6-100, the component (A)/component (B) weight ratio being about 50/50 to 90/10.
Dependencies are inferred from the claim text.