Method of preparing a microporous film, and imaging method
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United States of America Patent
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Feb 10, 2004
Grant Date -
Sep 20, 2001
app pub date -
Mar 12, 2001
filing date -
Mar 6, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for manufacturing a microporous film comprising the steps of: (a) providing a first polymer which is a hydrophobic thermoplastic polymer and a second polymer which is a hydrophilic polymer or copolymer of N-vinylpyrrolidone; (b) dissolving said first and second polymers in a solvent system which is compatible with both polymers, said solvent system comprising a blend of an aprotic organic solvent and an alcohol; (c) coating the resulting solution on a support; (d) effecting at least a partial drying of the resulting coating; and (e) washing the coating in an aqueous medium so as to extract at least 50% by weight of the said second polymer.
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