Porous film, method for manufacturing the same, gas permeability control film, and water vapor permeability control film
AssigneeSeiji Kagawa
InventorSeiji Kagawa
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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.
Claims8
A porous film consisting essentially of a single organic film in which a large number of non-through perforation pores are formed at a density of 500 to 200,000 pores/cm.sup.2, each pore being open at one surface of the film and having a substantially V-shaped cross section, and said organic film having a thin film portion which is located below the non-through perforation pores and has an average thickness of 10 .mu.m or less.
A porous film having a double-layer structure composed of first and second organic films which are dissimilar to each other and stacked one upon the other, said porous film having a large number of non-through perforation pores which penetrate the entire thickness of the first organic film and extend into the second organic film, said no non-through perforation pores formed at a density of 500 to 200,000 pores/cm.sup.2, each pore being open at one surface of said first organic film, having a substantially V-shaped cross section and extending through said first organic film into said second organic film, and said second organic film having a thin film portion which is located below the non-through perforation pores and has an average thickness of 10 .mu.m or less.
Dependencies are inferred from the claim text.