Porous polytetrafluoroethylene compositions

B - Operations – Transporting – 29 – C

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B29C 55/00 (2006.01) C08L 27/18 (2006.01)

Patent

CA 2183350

In the present invention a blend of resin composition and blending technique is optimized to provide a desired balance of node size and fibril length with the additional property of thermal stability in the resulting stretched material. The stretched blend can be described as a polytetrafluoroethylene porous material having a microstructure of nodes in- terconnected by fibrils in which the mate- rial comprises a blend of two different poly- tetrafluoroethylene, one polytetrafluoroethy- lene being a homopolymer of tetrafluoroethy- lene and the other polytetrafluoroethylene be- ing a modified polymer of tetrafluoroethylene.

L'invention permet d'optimaliser une technique de mélange afin d'obtenir un mélange d'une composition de résine dans laquelle on atteint un équilibre souhaité entre la taille des noeuds et la longeur des fibriles avec, de plus, une stabilité thermique de la matière étirée obtenue. Le mélange étiré peut être décrit comme une matière poreuse à base de polytétrafluoroéthylène dont la microstructure est constituée de noeuds reliés entre eux par des fibriles et où la matière consiste en un mélange de deux polytétrafluoroéthylènes différents, l'un d'eux étant un homopolymère de tétrafluoroéthylène et l'autre étant un polymère modifié de tétrafluoroéthylène.

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