POLYOLEFIN MICROPOROUS MEMBRANE

• Main Authors: SEKIGUCHI, Manabu, HISAMITSU, Shinya, KAWACHI, Mana, MIYAZAWA, Hiroshi, ODA, Yoshiki
• Format: Patent
• Language: English; French; Japanese
• Published: 15.04.2021
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

Provided is a polyolefin microporous membrane in which the membrane thickness is 1.0-17.0 μm inclusive, the flexural modulus, which is the value of the flexural rigidity (gf × cm2/cm) in the longitudinal direction (MD) divided by the cube of the membrane thickness (μm), is 0.3 (μgf × cm2/cm)/μm3 to 1.5 (μgf × cm2/cm)/μm3 inclusive, and the basis weight-converted puncture strength is 70 gf/(g/m2) to 160 gf/(g/m2) inclusive. L'invention concerne une membrane microporeuse en polyoléfine telle que l'épaisseur de la membrane va de 1,0 à 17,0 μm inclus, le module de flexion, qui est la valeur de la rigidité à la flexion (gf × cm2/cm) dans la direction longitudinale (MD) divisée par le cube de l'épaisseur de la membrane (µm), va de 0,3 (μgf × cm2/cm)/μm3 à 1,5 (μgf × cm2/cm)/μm3 inclus, et la résistance à la perforation convertie en poids de la base va de 70 gf/(g/m2) à 160 gf/(g/m2) inclus. 膜厚が１．０μｍ以上１７．０μｍ以下であり、長手方向（ＭＤ）の曲げ剛性（ｇｆ×ｃｍ２／ｃｍ）を膜厚（μｍ）の３乗で除した値である曲げ係数が、０．３（μｇｆ×ｃｍ２／ｃｍ）／μｍ３以上１．５（μｇｆ×ｃｍ２／ｃｍ）／μｍ３以下であり、かつ目付換算突刺強度が７０ｇｆ／（ｇ／ｍ２）以上１６０ｇｆ／（ｇ／ｍ２）以下であるポリオレフィン微多孔膜が提供される。