C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/1043, 18/16,
C08J 9/24 (2006.01) B01D 69/12 (2006.01) B01D 71/36 (2006.01) B29C 43/00 (2006.01) B29C 47/00 (2006.01) B29C 47/06 (2006.01) B29C 47/54 (2006.01) B29C 47/94 (2006.01) B29C 55/00 (2006.01) B29C 55/02 (2006.01) B32B 5/32 (2006.01)
Patent
CA 2031808
A process for producing a multilayer polytetrafluoro- ethylene porous membrane is disclosed, which process comprises at least two layers having different average pore diameters, 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; paste- extruding the powders to obtain a multilayer extrudate, which is then optionally rolled; removing the liquid lubricant from the multilayer extrudate or the rolled multilayer extrudate to obtain an unsintered multilayer structure; subsequently heating the unsintered multilayer structure at a temperature not lower than the melting point of sintered polytetrafluoro- ethylene to obtain a semisintered multilayer structure; and then stretching the semisintered multilayer structure at least monoaxially. A semisintered polytetrafluoroethylene multilayer structure capable of being used as an intermediate material for the above process is also disclosed.
Inoue Osamu
Nishibayashi Hirofumi
Tamaru Shinji
Tanaka Osamu
Yamamoto Katsutoshi
Daikin Industries Ltd.
Riches Mckenzie & Herbert Llp
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