Process for producing multilayer polytetrafluoroethylene...

Details Process for producing multilayer polytetrafluoroethylene... Process for producing multilayer polytetrafluoroethylene...

C - Chemistry, Metallurgy

08

J

18/1043, 18/16,

C08J 9/34 (2006.01) B01D 69/12 (2006.01) B01D 71/36 (2006.01) B29C 47/06 (2006.01) B29C 55/00 (2006.01) B29C 55/02 (2006.01) C08J 9/28 (2006.01) C08J 9/36 (2006.01)

Patent

CA 2031827

A process for producing a multilayer polytetrafluoro- ethylene porous membrane comprising at least two layers having different average pore diameters is disclosed, the process comprising the steps of: filling the inside of a cylinder of an extruding mold distinctively with at least two kinds of polytetrafluoroethylene fine powders with each of which a liquid lubricant has been mixed; subsequently paste-extruding the powders to obtain a multilayer extrudate, which is then optionally rolled; and then stretching the extrudate or the rolled extrudate at least monoaxially after the liquid lubricant is removed therefrom or without removing the liquid lubricant.

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