Process for producing a porous track membrane

Details Process for producing a porous track membrane Process for producing a porous track membrane

2005-07-26

2009-10-06

Olsen, Allan (Department: 1792)

Etching a substrate: processes

Etching to produce porous or perforated article

C216S087000, C210S500220, C210S500270

Reexamination Certificate

active

07597815

ABSTRACT:
Porous track membranes are produced by exposing a polymeric film to a bombardment of heavy ions to provide the film with a track density, and etching pores into the resulting tracked film with an etching solution to provide the film with a density of the pores corresponding to the track density under conditions to maintain turbulent flow. An alkaline etching solution is used that contains salts of alkali metals in sufficient concentration to increase the boiling point of the resulting alkali-metal-containing solution to temperatures in excess of about 100 up to about 150° C.

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