Method for forming microporous fluorocarbon polymer sheet and pr

Details Method for forming microporous fluorocarbon polymer sheet and pr Method for forming microporous fluorocarbon polymer sheet and pr

1977-12-12

1980-04-01

Anderson, Philip

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204252, 204296, 264 49, 264127, 521 63, B29D 2700

Patent

active

041960700

ABSTRACT:
A method for forming a microporous sheet of fluorocarbon polymer (e.g., polytetrafluoroethylene). An aqueous dispersion of polytetrafluoroethylene which includes a dissolved water-soluble, crystallizable metallic organic salt, preferably sodium benzoate, is formed into a sheet. Water is evaporated from an exposed surface of the sheet to grow crystals of the organic salt dispersed throughout the sheet. Then, the sheet is sintered. After cooling, the salt crystals are leached from the sheet by dissolution in water to leave a porous structure suitable for such uses as a filtration membrane or as a separation barrier in batteries or electrolytic cells.

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