Electret filter made of fibers containing polypropylene and...

Details Electret filter made of fibers containing polypropylene and... Electret filter made of fibers containing polypropylene and...

B - Operations, Transporting

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183/109

B03C 3/30 (2006.01) B01D 39/16 (2006.01) B03C 3/28 (2006.01) H01G 7/02 (2006.01)

Patent

CA 1323584

41995 CAN 9A ELECTRET FILTER MADE OF FIBERS CONTAINING POLYPROPYLENE AND POLY(4-METHYL-1-PENTENE ABSTRACT A fibrous electret filter better sustains electret filtration enhancement upon exposure to aerosol oils when made of fibers containing polyolefin (preferably 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.

585049

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