Process for producing multilayer polytetrafluoroethylene porous

Details Process for producing multilayer polytetrafluoroethylene porous Process for producing multilayer polytetrafluoroethylene porous

1990-12-06

1991-11-12

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Stratified or layered articles

264119, 264122, 264127, 2642888, B29C 4706, B29C 5500, B32B 526

Patent

active

050645935

ABSTRACT:
A process for producing a multilayer polytetrafluoroethylene 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.

REFERENCES:
patent: 4096227 (1978-06-01), Gore
patent: 4208745 (1980-06-01), Okita
patent: 4478898 (1984-10-01), Kato
patent: 4707314 (1987-11-01), Kawahigashi et al.
patent: 4882113 (1989-11-01), Tu et al.
patent: 4961891 (1990-10-01), Pitolaj
Abstract of Japan 60-104319.

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