| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a polyolefin separator with high strength, low pore-blocking temperature, and low shrinkage percentage. SOLUTION: This polyolefin separator is composed of polyolefin resin containing high molecular weight polyethylene having a viscosity average molecular weight of 500,000 or more and polyethylene having a viscosity average molecular weight of less than 500,000, and has a piercing strength of 20 g/μm or more, a pore blocking temperature of 135 deg.C or less, and a shrinkage percentage of 30% or less at 135 deg.C.</p> |
