Microporous membrane with a stratified pore structure created in situ and process
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United States of America Patent
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Issued Date -
Apr 18, 2002
app pub date -
Apr 30, 2001
filing date -
Sep 5, 1995
priority date (Note) -
Abandoned
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Abstract
A microporous membrane is described comprising at least two layers, wherein each layer is characterized by nodes interconnected by fibrils, the layers are bonded by means of plastic flow at temperatures below the melting point of either membrane material, and the pore architecture is formed in situ by an expansion process. A stratified microporous membrane is produced wherein the pore architecture of each layer may be discretely controlled. The article is useful for filtration and medical applications where a pore size gradient is required.
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