US2009298373A1PendingUtilityA1
Extremely high liquid barrier fabrics
Est. expirySep 17, 2022(expired)· nominal 20-yr term from priority
Inventors:Michael Allen Bryner
D04H 3/016D04H 3/007D06M 7/00D04H 1/559D04H 1/56A61F 13/51462A41D 31/102Y10T442/66B32B 2307/73Y10T442/608Y10T442/614B32B 5/26B32B 2255/02Y10T442/626Y10T442/68Y10T442/621B32B 2255/26Y10T442/659B32B 2307/724Y10T442/60Y10T442/2164B32B 5/022Y10T442/2189Y10T442/681
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Claims
Abstract
One embodiment of the present invention is a nonwoven fabric comprising a support web and a fibrous barrier web, having a hydrohead of at least about 145 cm and a Frazier permeability of at least about 0.3 m 3 /m 2 -min.
Claims
exact text as granted — not AI-modified1 . A nonwoven fabric comprising a support web and a fibrous barrier web, having a hydrohead of at least about 145 cm and a Frazier permeability of at least about 0.3 m 3 /m 2 -min.
2 . A nonwoven fabric comprising at least one support web and a hydrophobic barrier web with fibers having diameters of less than 2.0 micrometers, a hydrohead of at least about 145 cm and a Frazier permeability of at least about 0.3 m 3 /m 2 -min.
3 . The nonwoven fabric of claims 1 or 2 , wherein said barrier web fibers have diameters of less than 1.0 micrometer.
4 . The nonwoven fabric of claims 1 or 2 , wherein said barrier web fibers have diameters of less than 0.5 micrometer.
5 . The nonwoven fabric of claim 3 , wherein the barrier layer basis weight is no more than 15 g/m 2 .
6 . The nonwoven fabric of claim 4 , wherein the barrier layer has a basis weight of no more than 3 g/m 2 .
7 . The nonwoven fabric of claims 1 or 2 , wherein said barrier web comprises nanofibers of hydrophobic polymer or copolymer.
8 . The nonwoven fabric of claim 7 , wherein said hydrophobic polymer or copolymer is a polyolefin, a partially fluorinated polymer or a perfluorinated polymer.
9 . The nonwoven fabric of claim 8 , wherein said hydrophobic polymer or copolymer has repeating units derived from ethylene, propylene, butenes, hexenes, octenes, styrenes, 4-methylpentene-1 and combinations thereof.
10 . The nonwoven fabric of claims 1 or 2 , wherein said barrier web is rendered hydrophobic by coating with a hydrophobic coating.
11 . The nonwoven fabric of claim 10 , wherein said hydrophobic coating is a fluorocarbon coating material.
12 . The nonwoven fabric of claims 1 or 2 , wherein the barrier web has a maximum pore size between fibers of no more than about 23 micrometers.
13 . The nonwoven fabric of claims 1 or 2 , wherein the barrier web has a solids fraction of no less than about 0.03.
14 . A nonwoven barrier fabric comprising a fibrous barrier web, said fabric having a hydrohead of at least about 145 cm and a Frazier permeability of at least about 0.3 m 3 /m 2 -min and having a relationship between barrier web basis weight, and fabric hydrohead and Frazier permeability described by the formula:
Bwt
(
g
/
m
2
)
≤
4000
·
c
·
(
1
-
2.3
·
c
)
·
ρ
f
Frazier
·
Hy
dr
oh
ead
k
(
c
)
,
wherein
ρ f , is the density of the barrier fibers, kg/m 3 c is the solids volume fraction of the barrier web,
k ( c )=3.58 ·c 2 −1.32 ·c+ 1.77,
Frazier is in units of m 3 /m 2 -min, and
Hydrohead is in units of centimeters of water column.
15 . A nonwoven fabric according to one of claims 1 , 2 or 14 , comprising a structure of FF/mSB, wherein FF is a barrier web.
16 . A nonwoven fabric according to one of claims 1 , 2 or 14 , comprising a structure of FF/SB, wherein FF is a barrier web.
17 . A nonwoven fabric according to one of claims 1 , 2 or 14 , comprising a structure of mSB/FF/mSB, wherein FF is a barrier web.
18 . A nonwoven fabric according to one of claims 1 , 2 or 14 , comprising a structure of FF/MB/SB, wherein FF is a barrier web.
19 . A nonwoven fabric according to one of claims 1 , 2 or 14 , comprising a structure of SB/MB/FF/MB/SB, wherein FF is a barrier web.
20 . A nonwoven fabric according to one of claims 1 , 2 or 14 , comprising a structure of FF/MB/mSB, wherein FF is a barrier web.
21 . A nonwoven fabric according to one of claims 1 , 2 or 14 , comprising a structure of mSB/MB/FF/MB/mSB, wherein FF is a barrier web.
22 . A nonwoven fabric according to one of claims 1 , 2 or 14 , comprising a structure of SB/MB/FF/SB, wherein FF is a barrier web.
23 . A nonwoven fabric of claims 1 or 2 , wherein said support web comprises fibers having diameters less than about 20 times the barrier web fiber diameters.
24 . The nonwoven fabric of claim 23 , wherein said support web fibers have diameters less than about 13 micrometers.Join the waitlist — get patent alerts
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