| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a material capable of forming a polytetrafluoroethylene porous film which can readily be stretched biaxially, is capable of uniform stretching even at high stretching ratios, and has low pressure loss. <P>SOLUTION: A stretch material contains: (A) a polytetrafluoroethylene having fibrillating properties and a standard specific gravity (SSG) of 2.130-2.230; and (B) a non-fibrillating low-molecular-weight polytetrafluoroethylene having a melt viscosity of 1×10<SP POS="POST">2</SP>to 7×10<SP POS="POST">5</SP>Pa_s at 380°C, which is not irradiated with an electron beam or a radiation beam. <P>COPYRIGHT: (C)2013,JPO&INPIT |
