| 摘要 |
PURPOSE:To increase the absorbency and retainability of an electrolyte and to decrease deterioration in quality with time by occupying 30% or more of the whole surface area of single fibers which constitute a nonwoven fabric by fibers of specific saponified ethylene-vinyl acetate copolymer. CONSTITUTION:Fibers of saponified ethylene-vinyl acetate copolymer in which the copolymerization ratio of ethylene is 25-60 molar percent and saponification degree is 90% or more are mixed so as to occupy 30% or more of the whole surface srea of single fibers which constitute a nonwoven fabric. If the copolymerization ratio of ethylene is less than 25 molar percent, the production of the copolymer is difficult, and if it exceeds 60 molar percent, the absorbency and retainability of an electrolyte are in sufficient. If saponification degree is less than 90%, fiber forming capability and other performance are not satisfied. The retainability and absorbency of the electrolyte are increased and deterioration in quality in the electrolyte with time is decreased. |
