Electret filter media and filtering masks that contain electret filter media
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United States of America Patent
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Aug 31, 2004
Issued Date -
N/A
app pub date -
Sep 2, 1997
filing date -
Aug 17, 1993
priority date (Note) -
Expired
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Abstract
Electret filter media comprising a nonwoven web of thermoplastic nonconductive microfibers having trapped charge, said charge provided by (1) subjecting the nonwoven web to a corona treatment, followed by (2) impingement of jets of water or a stream of water droplets on the web at a pressure sufficient to provide the web with filtration enhancing electret charge and (3) drying the web. This electret filter media may be used in a respiratory mask to provide extraordinarily good filtration properties.
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