Modified polytetrafluoroethylene fine powder and preparation thereof
AssigneeE. I. Du Pont de Nemours and Company
InventorSatish C. Malhotra
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Abstract
A modified fine powder polytetrafluoroethylene, and the process for preparing the polymer, in which the modifying copolymerizable monomer is a selected dioxole monomer. The composition is dispersion-process-produced and includes a core portion having a copolymer comprising repeat units provided by tetrafluoroethylene monomer and dioxole monomer, and a shell portion that is substantially free of dioxole units. The core and shell portions may contain perfluoro (n-propylvinyl) ether. The composition is useful for paste extrusion, such as in wire coating and tubing applications.
Claims8
A modified dispersion-process-produced polytetrafluoroethylene fine powder composition comprising a core portion having a copolymer comprising repeat units provided by a tetrafluoroethylene monomer and repeat units provided by at least one copolymerizable monomer of the formula ##STR4## wherein X and X' are selected from the group consisting of F, Cl and H, and Y is selected from the group consisting of ##STR5## wherein Z and Z' are selected from the group consisting of F, alkyl units having from 1 to 6 carbon atoms, and fluorinated alkyl units having from 1 to 6 carbon atoms, and a shell portion that is substantially free of dioxole units.
Dependencies are inferred from the claim text.