Porous film
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United States of America Patent
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Aug 24, 1999
Grant Date -
N/A
app pub date -
Jan 13, 1997
filing date -
Mar 1, 1994
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Abstract
A method of producing a porous film comprises subjecting a fibrous material comprised of fibers of a film forming material to conditions of heat and pressure to covert the fibrous material to a porous film. The method allows the production of film material having substantially uniform pore sizes. For example, the pore size distribution of the film may be such as to have a ratio of maximum pore size:mean flow pore of less than 1.2, e.g., less than 1.1.
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