Ultrathin, porous and mechanically stable nonwoven fabric and method for manufacturing
AssigneeCarl Freudenberg KG
InventorsPeter Kritzer, Raoul Farer, Guenter Frey, Michael Appelgruen, Rolf-Peter Schwoebel
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Abstract
An ultrathin, porous, and mechanically stable nonwoven fabric, a method for manufacturing the fabric, and the fabric's use are described. A nonwoven fabric is described having a thickness of less than 30 μm, which is chemically and/or thermally bonded, whose maximum tensile load in at least one direction is at least 15 N/5 cm, whose stretching in this direction at maximum tensile load is 35% at the most, and which has a porosity of at least 25%. This nonwoven fabric may be used as a separator material or as a carrier material for diaphragms.
Claims10
A nonwoven fabric suitable as a carrier material for separators in lithium batteries or in super capacitors, the nonwoven fabric having
- a thickness of less than or equal to 30 μm,
- a maximum tensile load in at least one direction of at least 15 N/5 cm, and a maximum extension in the direction at the maximum tensile load being 35%,
- a porosity of at least 40% and a mass per unit area of from 3 g/m2 to 25 g/m2, and
- wherein the nonwoven fabric includes fibers having a melting point greater than 200° C. selected from the group consisting of polyethylene terephthalate and polybutylene terephthalate, and
- wherein the nonwoven fabric is reinforced using a chemically and/or thermally bonded material selected from binding fibers, melting adhesives, and chemical binding agents.
Dependencies are inferred from the claim text.