Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1988-01-25
1989-10-17
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55101, 55155, 55527, 55DIG35, 55DIG39, B01D 3506
Patent
active
048743992
ABSTRACT:
A fibrous electret filter better sustains electret filtration enhancement upon exposure to aerosol oils when made of fibers containing polypropylene and at least one percent by weight of poly(4-methyl-1-pentene). Even better stability is attained when the poly(4-methyl-1-pentene) content of the electret filter is ten percent by weight of total polyolefin. When used as an air filter, such as in a respirator, the electret filter has surprisingly better filtration performance than does a comparable electret filter made of 100% polypropylene fibers. The electret filter can be made either of melt-blown microfibers or of fibers of fibrillated film.
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Jones Marvin E.
Reed John F.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Spitzer Robert
Tamte Roger R.
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