Recombinant battery separator
AssigneeDaramic, LLC
InventorJerry Zucker
Life of this patent
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Abstract
A recombinant battery separator pad is made from a mat of meltblown ultrafine polymer fibers, with the fibers being treated with an agent to render them permanently wettable. The fibers include at least ten percent of less than one micron, with the majority less than five microns. The mat has a liquid porosity of at least 90% and a surface area of at least 1.0 m.sup.2 /g.
Claims11
A battery separator for use between the electrodes of an acid type recombinant battery, said separator comprising an uncompressed mat of thermally bonded meltblown thermoplastic polymer fibers, at least ten percent of said fibers having diameters of less than one micron and at least sixty percent of said fibers having diameters of less than five microns, said fibers having a surface area of greater than 1 m.sup.2 /g, said mat having a liquid porosity of at least 90 percent and having about five to about fifteen percent void volume after charging with liquid acid to allow transmission of gas, said fibers being treated with an agent to render them wettable in acid, said separator completely absorbing said liquid acid.
Dependencies are inferred from the claim text.