Aramid thin sheet material and electrical/electronic parts using the same

Abstract

The invention provides an aramid thin sheet material comprising two components of aramid staple fibers and fibrillated aramid, or said two components and aramid fibrid, in particular, characterized by satisfying both of the following expressions (1) and (2): [internal resistance] (μm)≦250 (μm)  expression (1) [Oken-type gas permeability] (sec/100 cm 3 )≧0.5 (sec/100 cm 3 )  expression (2) wherein the [internal resistance] is a resistance value calculated by the following expression (3): [ internal ⁢   ⁢ resistance ⁢   ] ⁢ ( μ ⁢   ⁢ m ) = [ electrical ⁢   ⁢ conductivity ⁢   of ⁢   ⁢ electrolyic ⁢   ⁢ solution ] [ electrical ⁢   ⁢ conductivity of ⁢   ⁢ electrolytic solution ⁢ - ⁢ injected ⁢   thin ⁢   ⁢ sheet ⁢   ⁢ material ] × [ thickness ⁢   of ⁢   ⁢ the ⁢     ⁢ thinsheet   ⁢ material ] ⁢ ( μ ⁢   ⁢ m ) . expression ⁢   ⁢ ( 3 )

1 . An aramid thin sheet material comprising two components of aramid staple fibers and fibrillated aramid, or said two components and aramid fibrid.  
   
   
       2 . An aramid thin sheet material as set forth in  claim 1 , characterized by satisfying both of the following expressions (1) and (2):  
       [internal resistance] (μm)≦250 (μm)  expression (1)  [Oken-type gas permeability] (sec/100 cm 3 )≧0.5 (sec/100 cm 3 )  expression (2)  wherein the [internal resistance] is a resistance value calculated by the following expression (3):                                [     internal   ⁢           ⁢   resistance     ⁢           ]     ⁢     (     μ   ⁢           ⁢   m     )       =               [             electrical   ⁢           ⁢   conductivity     ⁢                       of   ⁢           ⁢   electrolyic   ⁢           ⁢   solution           ]             [                 electrical   ⁢           ⁢   conductivity               of   ⁢           ⁢   electrolytic                       solution   ⁢     -     ⁢   injected     ⁢                       thin   ⁢           ⁢   sheet   ⁢           ⁢   material           ]       ×     [           thickness   ⁢                         of   ⁢           ⁢   the     ⁢                               ⁢   thinsheet                       ⁢   material           ]     ⁢       (     μ   ⁢           ⁢   m     )     .             expression   ⁢           ⁢     (   3   )                   wherein [electrical conductivity of electrolytic solution-injected thin sheet material] is the electrical conductivity calculated from an AC impedance measured by sandwiching the electrolytic solution-injected thin sheet material between two electrodes.    
   
   
       3 . Electrical/electronic parts which are characterized by using the aramid thin sheet material as set forth in  claim 1  or 2 as separator panels between their electrically conductive members.