Multilayer composite air filtration media
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United States of America Patent
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-
May 30, 1995
Grant Date -
N/A
app pub date -
May 20, 1993
filing date -
May 20, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A composite filter media is formed of a plurality of layers. A central layer of electrostatically charged material formed of a carded mixture of polyolefin fibers such as polypropylene and electro-negative substituted organic resin fibers such as modacrylic acrylonitrile-vinyl, chloridevinylidene chloride copolymer efficiently filter more than 99% of 0.1 to 0.5 micron particles. A flame retardant prefilter layer of polyester removes large particles and a backing of flame retardant linear polyester provides tear resistance. An optional layer of electrostatically charged, melt blown, polyolefin such as polypropylene prevents the central layer from loading up by effectively filtering intermediate sized particles.
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