Expanded polytetrafluoroethylene products and process for...

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/00 (2006.01) A61L 27/00 (2006.01) B29C 47/00 (2006.01) B29C 47/54 (2006.01) B29C 55/22 (2006.01)

Patent

CA 2483988

Disclosed are expanded polytetrafluoroethylene products, such as porous polytetrafluoroethylene tubes, having high axial tear strength and a process for their production. Each expanded polytetrafluoroethylene product has a microstructure, which comprises fibrils and nodes interconnected with each other by the fibrils, and has an axial tear strength of not lower than 6,000 gf/mm as calculated in accordance with the following formula: L/[Tx(V/100)] where L (gf) is an axial tear load, t (mm) is a wall thickness, and V (%) is a volume ratio of resin The process for the production of the expanded polytetrafluoroethylene product includes a high-speed extrusion step.

L'invention concerne des moulages en polytétrafluoroéthylène étiré, comprenant un tube de polytétrafluoroéthylène poreux à résistance au déchirement élevée dans le sens axial, et un procédé d'élaboration correspondant. Plus spécifiquement, l'invention concerne des moulages en polytétrafluoroéthylène étiré à microstructure constituée de fibrilles et de noeuds reliés par ces fibrilles, présentant une résistance au déchirement dans le sens axial de 6 000 gf/mm ou plus, calculée selon la formule L/[T x (V/100)], la charge de déchirement dans l'axe étant représentée par L(gf), l'épaisseur de paroi étant représentée par T(mm), et le rapport volumique de la résine étant représenté par V(%). L'invention concerne aussi un procédé d'élaboration pour ces moulages, qui comprend une opération de moulage par extrusion à grande vitesse.

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