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FLUID TRANSFER MEMBRANE USE THEREOF AND METHOD OF MANUFACTURE THEREFOR

  • US 3,764,018 A
  • Filed: 06/15/1971
  • Issued: 10/09/1973
  • Est. Priority Date: 06/15/1971
  • Status: Expired due to Term
First Claim
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2. A method for the manufacture of a fluid transfer membrane comprising a thin walled permeable polymeric film having a plurality of first orifices circumscribed by the inner surfaces of oblong shaped portions of said film and by the outer surfaces of connecting portions joining said oblong shaped portions and having a plurality of second orifices circumscribed by the outer surfaces of said oblong shaped portions and by the inner surfaces of connecting portions of said film joining said oblong portions at both ends thereof, which method comprises the sequential steps of:

  • a. coating a removable plate with a photoresistive chemical;

    b. placing a mask selected from a template, a positive transparency or a negative transparency, with a plurality of opaque or translucent regions over said photoresistive coating;

    c. exposing the mask to a radiant energy source;

    d. removing the mask;

    e. developing the photoresistive material to provide unprotective portions of said plate coincident with said regions;

    f. removing plate material to form a template having a plurality of oblong shaped orifices coincident with said regions;

    g. coating the template surfaces with a permeable polymeric film composition;

    h. exposing at least one end surface of the template; and

    i. removing the template material;

    so that the remaining polymeric film defines said membrane.

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