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US 6,548,612 B2Granted
Melt-processible poly(tetrafluoroethylene)
AssigneeEidgenossische Technische Hochschule Zurich
InventorsPaul Smith, Jeroen Visjager, Cees Bastiaansen, Theodorus Tervoort
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Abstract
Melt-processible, thermoplastic poly(tetrafluoroethylene) (PTFE) compositions are disclosed and methods for making and processing same. Additionally, products comprising these compositions are described.
Claims49
A method for producing an article comprising:
- melt-processing a composition comprising a poly(tetrafluoroethylene) polymer, wherein said polymer has
- (i) a melt flow index between 0.25 and about 50 g/10 min;
- (ii) an elongation to break of at least 10%;
- (iii) a crystallinity of 1-55%;
- (iv) less than 1 weight percent of co-monomer;
- and
- (v) less than 0.5 mol % of co-monomer;
- wherein all said co-monomer consists essentially of co-monomer selected from the group consisting of hexafluoropropylene and perfluoro(alkyl vinylether).
5 more elements
A method for producing an article comprising:
- melt-processing a composition comprising a poly(tetrafluoroethylene) polymer, wherein said poly(tetrafluoroethylene) polymer has
- (i) a non-zero melt flow index;
- (ii) an elongation to break of at least 10%;
- (iii) a crystallinity of 1-55%;
- (iv) a crystalline melting temperature in the range of about 310 to about 335° C.;
- and
- wherein said poly(tetrafluoroethylene) polymer comprises co-monomer, said co-monomer consisting essentially of perfluoro(alkyl vinylether) co-monomer, and said co-monomer being present in an amount of less than 1 weight percent and less than 0.5 mol %.
4 more elements
A method for producing an article comprising:
- melt-processing a composition comprising a blend of two or more poly(tetrafluoroethylene) polymers, wherein said blend has
- (i) a non-zero melt flow index;
- (ii) a melting temperature in the range of 310° C. to about 335° C.;
- (iii) an elongation to break of at least 10%;
- and
- (iv) a crystallinity of 1-55%;
- and wherein at least two of said two or more poly(tetrafluoroethylene) polymers have a co-monomer content below 1 wt %.
4 more elements
Dependencies are inferred from the claim text.