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Extrudable fluoropolymer blends

  • US 6,790,912 B2
  • Filed: 12/11/2001
  • Issued: 09/14/2004
  • Est. Priority Date: 12/11/2001
  • Status: Expired due to Term
First Claim
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1. A melt processable fluorothermoplastic composition comprising a major amount of a first fluoropolymer, wherein the first fluoropolymer comprises a semi-crystalline fluorinated copolymer, and a minor amount of a second fluoropolymer effective to reduce melt defects in the composition, each fluoropolymer being selected from:

  • (a) a semi-crystalline perfluorinated copolymer, (b) a fluoropolymer derived from interpolymerized units of at least one essentially perfluorinated monomer, at least one non-fluorinated hydrogen-containing monomer, and optionally, perfluorobutyl-ethylene and/or no more than about 1% by weight of other partially fluorinated monomers;

    (c) a fluoropolymer derived from interpolymerized units of at least one partially-fluorinated monomer, and optionally at least one essentially perfluorinated monomer, and (d) an amorphous copolymer of tetrafluoroethylene and hexafluoropropylene;

    wherein when the first fluoropolymer is selected from (a), the second fluoropolymer is a semi-crystalline fluoropolymer selected from (b) and/or (c);

    when the first fluoropolymer is selected from (b), the second fluoropolymer is selected from (a), (c), and/or (d); and

    when the first fluoropolymer is a copolymer selected from (c), the second fluoropolymer is selected from (a), (b), and/or (d);

    with the proviso that, when the melt processable fluorothermoplastic composition comprises one or more copolymers selected from (c), the melt processable fluorothermoplastic composition comprises either;

    at least about 80% by weight of copolymers selected from (c) or no more than about 5% by weight of copolymers selected from (c).

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