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AssigneeE. I. Du Pont de Nemours and Company
InventorsGeorge R. Chapman, Jr., Donnan E. Priester, Charles W. Stewart, Robert E. Tarney
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The subject invention provides a composition having excellent extrusion characteristics comprising a difficulty-melt-processible polymer and 0.002-0.5 wt. % of one or more fluoropolymer process aids wherein the fluoropolymer has a fluorine to carbon ratio of at least 1:2, is capable of forming a die-coating film under the prevailing conditions of extrusion temperature and pressure, and contains an effective amount of polar functional polymer chain end groups, --W, wherein --W is selected from --COF, --SO.sub.2 F, --SO.sub.3 M, --OSO.sub.3 M, --COOR, and --COOM, wherein R is C.sub.1-3 alkyl and M is hydrogen, a metal cation, preferably an alkali or alkaline earth metal cation, or a quaternary ammonium cation.
Composition comprising a difficultly-melt-processible polymer and 0.002-0.5 wt. % of a fluoropolymer process aid that:
Composition comprised of linear low density polyethylene and 0.002-0.5 wt. % of a partially crystalline copolymer of tetrafluoroethylene and hexafluoropropylene having at least 200 --COF and --COOH groups per million carbon atoms.
Composition comprising linear low density polyethylene and 0.002-0.5 wt. % of polytetrafluoroethylene that has been treated with ionizing radiation sufficient to provide at least 200 --COF and --COOH groups per million carbon atoms.
Process comprising melt extruding a difficultly-melt-processible polymer having incorporated therein an effective amount, to improve processibility, of a fluoropolymer process aid that:
Dependencies are inferred from the claim text.