Oil-and water repellent gas-permeable filter
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United States of America Patent
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Oct 31, 1995
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N/A
app pub date -
Sep 7, 1994
filing date -
Sep 8, 1993
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Abstract
An oil- and water-repellent filter which contains a porous filter material that has its internal and external surfaces coated with a compound formed by combining a fluoropolymer having a fluorine-containing aliphatic cyclic structure in the main chain and a fluoropolymer containing polyfluoroalkyl groups. The coating imparts superior oil- and water-repellency without impairment to the flow of air or other gases through the filter.
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