Electrostatically charged porous nonwoven web, membrane and mask derived therefrom and methods for manufacture and cleaning
AssigneeArkema France
InventorsFabrice Domingues Dos Santos, Anthony Bonnet
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Abstract
A nonwoven web obtained by electrospinning, suitable for the filtration of nano- and/or submicron aerosols, including a multiplicity of fibers of composition C1, the composition C1 including at least 50% by weight of at least one polymer P1 based on the repeat unit resulting from vinylidene fluoride (VDF), the fibers of composition C1 having a degree of crystallinity in polar phase(s), preferentially in solely beta phase, of at least 65% by weight, with respect to their total weight. Also, a process for the manufacture of the web, to a membrane including the web and also to a process for the washing/sterilization of the web or of the membrane.
Claims19
A nonwoven web comprising a multiplicity of fibers of composition C1, the composition C1 comprising at least 50% by weight of at least one polymer P1 comprising a repeating unit of vinylidene fluoride (VDF),
- said fibers of composition C1 having a degree of crystallinity in polar phase(s), of at least 65% by weight, with respect to their total weight,
- the web comprising less than 1% by number of fibers having a diameter strictly of less than 100 nm,
- wherein the web is produced by a process comprising electrospinning,
- wherein the web is configured for filtration of nano and/or submicron aerosols.
Dependencies are inferred from the claim text.