Compositions containing particles of highly fluorinated ion exchange polymer
AssigneeE. I. Du Pont de Nemours and Company
InventorsDennis Edward Curtin, Edward George Howard, Jr.
Life of this patent
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Abstract
Solid and liquid compositions containing particles of highly fluorinated ion-exchange polymer having sulfonate functional groups with an ion exchange ratio of less than about 33. The compositions contain at least about 25% by weight of polymer particles having a particle size of about 2 nm to about 30 nm.
Claims18
A process for preparing an aqueous liquid composition comprising particles of a highly fluorinated ion-exchange polymer having sulfonate functional groups with an ion exchange ratio of less than about 33, said process comprising contacting in a pressurized vessel said polymer with an aqueous liquid dispersion medium under conditions which cause the polymer to form particles, at least about 25% by weight of said particles having a particle size of about 2 nm to about 30 nm, said dispersion medium being substantially free of water miscible organic compounds, cooling the contents of said vessel to a temperature of less than about 100.degree. C., and recovering an aqueous liquid composition comprising particles of said highly fluorinated ion-exchange polymer.
A process for preparing an aqueous liquid composition comprising particles of a highly fluorinated ion-exchange polymer having sulfonate functional groups with an ion exchange ratio of less than about 33, said process comprising contacting in a pressurized vessel said polymer with an aqueous liquid dispersion medium under conditions which cause the polymer to form particles, at least about 25% by weight of said particles having a particle size of about 2 nm to about 30 nm, cooling the contents of said vessel to a temperature of less than about 100.degree. C., and recovering an aqueous liquid composition comprising particles of said highly fluorinated ion-exchange polymer, said dispersion medium comprising 0.5 to 75% by weight of a dispersion assist additive selected from the group consisting of nonreactive, substantially water immiscible organic compounds and carbon dioxide.
A process for preparing an aqueous liquid composition comprising particles of a highly fluorinated ion-exchange polymer having sulfonate functional groups with an ion exchange ratio of less than about 33, said process comprising contacting in a pressurized vessel said polymer with an aqueous liquid dispersion medium under conditions which cause the polymer to form particles, at least about 25% by weight of said particles having a particle size of about 2 nm to about 30 nm, cooling the contents of said vessel to a temperature of less than about 100.degree. C., and recovering an aqueous liquid composition comprising particles of said highly fluorinated ion-exchange polymer, said process further comprising removing liquid components of said aqueous liquid composition to produce a solid composition.
A process for preparing an aqueous liquid composition comprising particles of a highly fluorinated ion-exchange polymer having sulfonate functional groups with an ion exchange ratio of less than about 33, said process comprising contacting in a pressurized vessel said polymer with an aqueous liquid dispersion medium under conditions which cause the polymer to form particles, at least about 25% by weight of said particles having a particle size of about 2 nm to about 30 nm, cooling the contents of said vessel to a temperature of less than about 100.degree. C., and recovering an aqueous liquid composition comprising particles of said highly fluorinated ion-exchange polymer, said process further comprising contacting the recovered liquid composition with H.sub.2 O.sub.2.
Dependencies are inferred from the claim text.