Polymeric sheet and electrochemical device using the same
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United States of America Patent
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Nov 3, 1998
Issued Date -
N/A
app pub date -
May 26, 1995
filing date -
Jul 9, 1991
priority date (Note) -
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Abstract
A polymeric sheet, which is particularly suited for use as a separator in an electrochemical device, is formed by graft copolymerizing acrylic acid, or another vinyl monomer capable of reacting with an acid or a base to form a salt directly or indirectly with fibers of a non-woven sheet, whose outer surface is provided by a polyolefin, especially polypropylene. The polyolefin is crosslinked as a result of the polymerization reaction. The polymerization reaction is preferably initiated by exposure of the sheet to ultraviolet radiation, after impregnation with an appropriate solution of the vinyl monomer.
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