POROUS MEMBRANE PREPARED BY STRETCHING HEAT-TREATED SHEET CONTAINING POLYTETRAFLUOROETHYLENE AND/OR MODIFIED POLYTETRAFLUOROETHYLENE
Number of patents in Portfolio can not be more than 2000
United States of America
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Issued Date -
Dec 26, 2024
app pub date -
Jan 31, 2022
filing date -
Jan 31, 2022
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Abstract
The present invention provides: a porous membrane comprising polytetrafluoroethylene and/or modified polytetrafluoroethylene, which has a small pore diameter, is difficult to break, and is resistant to an external force such as penetration and the like; and a manufacturing method of same. Further provided is a porous membrane comprising polytetrafluoroethylene and/or modified polytetrafluoroethylene, where the bubble point due to isopropyl alcohol in accordance with JIS K3832 is 500 kPa or more, a numerical value obtained by dividing the maximum force until a needle penetrates by the thickness of a test piece is 200 mN/μm or more, based on a needle penetration strength test in accordance with JIS Z1707, the percentage of pore opening portions in a surface image by electron microscopy is 10 to 30%, and the fiber thickness is 250 nm or more.
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