Separator with improved barrier performance

Details Separator with improved barrier performance Separator with improved barrier performance

2006-07-04

2006-07-04

Bell, Bruce F. (Department: 1746)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer, spacer or materials for use therewith

C429S129000, C429S247000, C429S248000, C429S249000, C429S250000, C429S254000, C442S327000, C442S340000, C442S361000, C442S362000, C442S363000, C442S364000, C442S389000, C442S392000, C442S400000, C442S401000

Reexamination Certificate

active

07070884

ABSTRACT:
The present invention is directed to a nonwoven composite fabric for use on batteries or fuel cells comprising one or more layers of fine denier spunbond filaments and at least one layer of barrier material, wherein said nonwoven composite fabric has an improved barrier performance as measured by an increase in the hydrostatic head to barrier layer basis weight ratio. In the present invention, a first fine denier layer is formed, comprising continuous spunbond thermoplastic filaments, with the size of the continuous filaments between about 0.7 and 1.2 denier, preferably less than or equal to 1 denier. A barrier layer is deposited onto the first fine denier layer. The barrier layer preferentially comprises microfibers of finite length, wherein the average fiber diameter is in the range of about 1 micron to about 10 microns, and preferably between about 1 micron and 5 microns, said layers being consolidated into a composite fabric.

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Kirk-Othmer, Encyclopedia Of chenical Technology, 3rdEdition, vol. 3, beginning p. 545, 24 pages.

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