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US 5,273,565 AGranted
Meltblown fabric
AssigneeExxon Chemical Patents Inc.
InventorsMancil W. Milligan, Robert R. Buntin, Fumin Lu
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Abstract
A meltblown web is composed of fibers having a narrow fiber size distribution (expressed as % coefficient of variation of the average fiber diameter) and low packing density. The web is characterized as a soft lofty web and exhibits exceptional filtration capability. The web preferably comprises fibers having an average fiber size of between 3 and 10 microns and a packing density of between 5 to 15%, and a CV of 15 to 40%.
Claims6
A meltblown nonwoven web comprising randomly entangled fibers of a thermoplastic polymer and having the following properties:
- (a) an average fiber size diameter of 3.0 to 10 microns;
- (b) a coefficient of variation of the web fiber size diameter of 15 to 40%;
- (c) a packing density of 5 to 15%;
- and
- (d) a ratio of packing density to average fiber size diameter of 1.3 to 1.75 .
2 more elements
Dependencies are inferred from the claim text.