Method of making a porous film
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United States of America Patent
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Jan 14, 1997
Issued Date -
N/A
app pub date -
May 18, 1995
filing date -
May 27, 1991
priority date (Note) -
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Abstract
A gas permeability control film having a barrier property against water, bacteria, and viruses, an oxygen gas permeation amount controlled to fall within the range of 10.sup.3 to 10.sup.7 cc/m.sup.2 .multidot.24 hours.multidot.25.degree. C., and a controlled carbon dioxide gas permeation amount. The gas permeability control film has an organic film in which non-through pores having an average opening width falling within the range of 0.5 .mu.m to 150 .mu.m are formed at a density of 500 to 200,000 pores/cm.sup.2.
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