| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a porous sheet excellent in mechanical strength, having low thermal conductivity and capable of being manufactured at high productivity.SOLUTION: The porous sheet has an isolated cell percentage of 60% or more, an average cell diameter in a thickness direction of 50μm or less, an apparent density of 0.2 g/cmor less, and satisfies the following formula (1) where x, y and z (μm) are average cell diameters in an MD direction, a TD direction and a thickness direction respectively. x/z≥2 and y/z≥2 (1).</p> |
