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US 4,543,394 AGranted
Fluoroelastomer having improved compression set resistance
AssigneeE. I. Du Pont de Nemours and Company
InventorsJoseph B. Finlay, Leo Ojakaar
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AssigneeE. I. Du Pont de Nemours and Company
InventorsJoseph B. Finlay, Leo Ojakaar
Estimating the term…
A peroxide curable fluoroelastomer composition wherein the composition comprises a tetrapolymer whose interpolymerized units consist essentially of units derived from: (1) about 30-40 weight percent vinylidene fluoride, (2) about 30-40 weight percent of the fluorine-containing monomers hexafluoropropylene or pentafluoropropylene, (3) about 25-35 weight percent tetrafluoroethylene and (4) up to 3 mole percent of units, based upon the tetrapolymer, derived from a bromine-containing olefin, with the proviso that enough of such units are present to provide 0.05 weight percent bromine in the tetrapolymer, the units of the bromine-containing olefin are derived from a compound having the formula CX.sub.2 .dbd.CX(CY.sub.2).sub.n (CZ.sub.2).sub.2 Br where X is hydrogen or fluorine, Y is hydrogen, fluorine or chlorine, Z is fluorine or chlorine and n is 0-5 and said fluoroelastomer composition contains at least 1 part per hundred parts tetrapolymer of trimethallylisocyanurate.
In a peroxide-curable fluoroelastomer composition wherein the composition comprises a tetrapolymer whose interpolymerized units consist essentially of (1) about 30-40 weight percent vinylidene fluoride, (2) about 30-40 weight percent of the fluorine-containing monomers hexafluoropropylene or pentafluoropropylene (3) about 25-35 weight percent tetrafluoroethylene, and (4) up to 3 mole percent, based upon the tetrapolymer, of a bromine-containing olefin, with the proviso that enough of such units are present to provide at least 0.05 weight percent bromine in the tetrapolymer, wherein said bromine-containing olefin is a compound having the formula CX.sub.2 .dbd.CX(CY.sub.2).sub.n (CZ.sub.2).sub.2 Br where X is hydrogen or fluorine, Y is hydrogen, fluorine or chlorine, Z is fluorine or chlorine and n is 0-5, and said fluoroelastomer composition contains from about 1-6 parts per hundred parts tetrapolymer of trimethallylisocyanurate.
Dependencies are inferred from the claim text.