| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polytetrafluoroethylene (PTFE) porous membrane with small elongation and small elongation anisotropy under an external force. <P>SOLUTION: In a tensile test in which an arbitrary in-plane direction of the membrane is taken as the first direction and the in-plane direction perpendicular to the first direction is taken as the second direction, the strengths of the PTFE porous membrane in the first and second directions are each ≥20 N/mm<SP POS="POST">2</SP>, and the elongations thereof at break in both directions are each ≤200%, with the ratio of the elongation in the second direction to that in the first direction being 0.5-2.0. <P>COPYRIGHT: (C)2012,JPO&INPIT |
