Multilayer composite air filtration media

Details Multilayer composite air filtration media Multilayer composite air filtration media

1993-05-20

1995-05-30

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

55486, 95 57, 95 69, 95 70, 96 15, 96 17, 96 55, 96 57, 96 58, 96 69, 428109, 428287, 428297, 428298, 428300, 428903, B32B 506

Patent

active

054199530

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.

REFERENCES:
patent: 4798850 (1989-01-01), Brown
patent: 4874399 (1989-10-01), Reed et al.

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