Patent ID: 6183913
Filing Date: 2001-02-06
Classification: D01F,D04H,H01M,Y02E

Abstract:
An alkaline battery separator comprising a hydrophilic nonwoven fabric obtainable by substantially uniformly admixing (1) polyolefin dividable composite fibers having an average fiber length of 20 to 60 mm, said polyolefin dividable composite fibers being a combination of high-density polyethylene and polypropylene, (2) high-strength fibers having an average fiber length of 30 to 60 mm and a fiber strength of at least 7 g/denier, said high-strength fibers being polypropylene and/or ultra-high-strength polyethylene, and (3) polyolefin heat-sensitive-adhesive fibers having an average fiber length of 30 to 60 mm, said polyolefin heat-sensitive-adhesive fibers being composed of a core component of polypropylene and a sheath component of low-density polyethylene, to form a fiber web by a dry-laid method, subjecting the resulting fiber web to a heat-fusing treatment and a hydro-entangling treatment to obtain a heat-fused and hydro-entangled nonwoven fabric, and imparting a hydrophilic property to the resulting heat-fused and hydro-entangled nonwoven fabric; said high-strength fibers accounting for 25 to 40 mass % with respect to a total mass of said polyolefin dividable composite fibers, said high-strength fibers and said polyolefin heat-sensitive-adhesive fibers.