Patent ID: 8221920
Filing Date: 2012-07-17
Classification: H01M,Y02E

Abstract:
1. A separator for a valve regulated lead-acid battery, wherein the separator which has a piercing strength of 4.5 N/mm or more and a tensile strength of 7.0 N/10 mm 2 or more, comprises a paper sheet made by blending 80 to 90% by weight of glass fiber having 1.5 μm or less average fiber size, 5 to 10% by weight of single-material monofilament-form thermally non-adhesive organic fiber and 5 to 10% by weight of single-material monofilament-form thermally adhesive organic fiber in a wet papermaking process, wherein 1) said single-material monofilament-form thermally non-adhesive organic fiber is a polyethylene terephthalate fiber and said single-material monofilament-form thermally adhesive organic fiber is a copolymerized polyester fiber; or 2) said single-material monofilament-form thermally non-adhesive organic fiber is a polypropylene fiber and said single-material monofilament-form thermally adhesive organic fiber is a polyethylene fiber; whereupon the fiber materials of the above glass fiber and the above monofilament-form thermally non-adhesive organic fiber are bonded each other by an adhesive component made by thermal fusion of the above monofilament-form thermally adhesive organic fiber whereby a coat by melting of the above monofilament-form thermally adhesive organic fiber is not substantially formed on the surface of the above glass fiber except the surface in contact with the above monofilament-form thermally adhesive organic fiber.