POROUS FILM, SEPARATOR FOR POWER STORAGE DEVICE AND POWER STORAGE DEVICE

• Main Authors: OKURA MASATOSHI, TAMURA NAOKO, IKOMA HIROSHI
• Format: Patent
• Language: English; Japanese
• Published: 18.06.2015
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

PROBLEM TO BE SOLVED: To provide a porous film having excellent uniformity of a hole structure, and excellent production stability and battery characteristics.SOLUTION: This invention relates to a porous film comprising polypropylene resin and crystallization nucleating agent, wherein the porous film has crystallization temperature of 129.0°C or more, and the crystallization nucleating agent in the porous film has a maximum size (L1a) of less than 8 μm. 【課題】 孔構造の均一性に優れ、生産安定性および電池特性に優れる多孔性フィルムを提供すること。【解決手段】 ポリプロピレン樹脂および結晶化核剤を含む多孔性フィルムであって、多孔性フィルムの結晶化温度が１２９．０℃以上であり、かつ、多孔性フィルム中の結晶化核剤の最大サイズ（Ｌ１ａ）が８μｍ未満である多孔性フィルムとする。【選択図】 なし