| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a material capable of forming a polytetrafluoroethylene porous film which is easily biaxially stretched, can be stretched uniformly even at a high draw ratio, and exhibits only a low pressure loss. <P>SOLUTION: The stretch material contains a polytetrafluoroethylene (A) having a standard specific gravity (SSG) of 2.130 to 2.230 and fibrillation property, and a low-molecular weight polytetrafluoroethylene (B) which has not been irradiated with electron beams or radiation, and has a melt viscosity at 380°C of 1×10<SP POS="POST">2</SP>to 7×10<SP POS="POST">5</SP>Pa s, and does not fibrillate. <P>COPYRIGHT: (C)2012,JPO&INPIT |
