Expanded porous polytetrafluoroethylene film having elastic...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/00 (2006.01) A47C 27/12 (2006.01) A61F 2/28 (2006.01) A61L 27/00 (2006.01) B29C 55/12 (2006.01) B32B 5/32 (2006.01) B32B 27/32 (2006.01) C08L 27/18 (2006.01) C09K 3/10 (2006.01) H01B 5/16 (2006.01) H01R 11/01 (2006.01)

Patent

CA 2552554

A porous stretched polytetrafluoroethylene film which has a residual strain of 11.0% or lower as measured after a load necessary for pushing the front end of a rod into the porous film in the thickness direction at a strain rate of 100 %/min to a depth which is 20% of the film thickness is repeatedly imposed 20 times, the rod being a cylindrical rod which has an outer diameter of 2 mm or larger and at least 1.9 times the film thickness, has a smooth and flat front- end surface perpendicular to the axis, and has a modulus in tension of 1.0×104 kgf/mm2 or higher. Also provided is a process for producing the porous film, which includes the step of compressing a porous stretched polytetrafluoroethylene film having a high stretch ratio.

Une pellicule de polytétrafluoréthylène étirée poreuse, qui a une tension résiduelle de 11,0% ou moins, tel que mesuré après une charge nécessaire pour pousser l'extrémité avant d'une tige dans la pellicule poreuse dans la direction de l'épaisseur, à un taux de tension de 100 %/mn et à une profondeur qui correspond à 20% de l'épaisseur de la pellicule, est imposée 20 fois, la tige étant une tige cylindrique qui possède un diamètre extérieur de 2 mm ou plus et au moins 1,9 fois l'épaisseur de la pellicule, qui possède une surface avant plate et fluide, perpendiculaire à l'axe et un module en tension de 1,0x10<4> kgf/mm<2> ou plus. Est également proposé un processus de production de la pellicule poreuse, qui inclut l'étape de compression d'une pellicule de polytétrafluoréthylène étirée poreuse ayant un ratio étiré élevé.

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