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US 11,383,504 B2Granted
Vapor-permeable, substantially water-impermeable multilayer article
AssigneeFiberweb, Inc.
InventorMehdi Afshari
Life of this patent
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Abstract
This disclosure relates to an article that includes a nonwoven substrate, a first film supported by the nonwoven substrate, and a second film such that the first film is between the nonwoven substrate and the second film. The first film includes a first polymer and a pore-forming filler. The difference between a surface energy of the first film and a surface energy of the nonwoven substrate is at most about 10 mN/m. The second film includes a second polymer capable of absorbing and desorbing moisture and providing a barrier to aqueous fluids.
Claims20
An article, comprising:
- a nonwoven substrate;
- a microporous film supported by the nonwoven substrate, the microporous film comprising a first polymer and a pore-forming filler, the difference between a surface energy of the microporous and a surface energy of the nonwoven substrate being at most about 10 mN/m;
- and
- a monolithic film comprising a second polymer capable of absorbing and desorbing moisture and providing a barrier to aqueous fluids, the microporous film being between the nonwoven substrate and the monolithic film
- wherein the article has the combination of (i) a maximum percent elongation determined by a difference between an elongated length of the article at break and an original length of the article of less than 70% according to ASTM D5034, and (ii) a moisture vapor transmission rate of at least 35 g/m2/day and at most 140 g/m2/day when measured at 23° C. and 50 RH %.
2 more elements
Dependencies are inferred from the claim text.