POROUS FILM AND POWER STORAGE DEVICE HAVING POROUS FILM

To provide a porous film having both initial electrical properties and excellent safety.SOLUTION: In a porous film having a layer (I) containing organic particles on at least one surface of a porous substrate, the organic particles are mainly composed of polyolefin, and the organic particles have a...

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Bibliographische Detailangaben
Hauptverfasser:	KAI NOBUYASU, WAKAHARA YOKO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BASIC ELECTRIC ELEMENTS CAPACITORS CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE ELECTRICITY PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Zusammenfassung:	To provide a porous film having both initial electrical properties and excellent safety.SOLUTION: In a porous film having a layer (I) containing organic particles on at least one surface of a porous substrate, the organic particles are mainly composed of polyolefin, and the organic particles have a melting point in the range of 60°C to 120°C, and when the thickness of the layer (I) before heat treatment is D1 and the thickness of the layer (I) after heat treatment at 120°C/10 minutes is D2, the thickness reduction rate calculated by the following formula is 1 to 75%. Δt (%)=(D1-D2)/D1×100.SELECTED DRAWING: None 【課題】初期の電気特性と優れた安全性を両立する多孔性フィルムを提供する。【解決手段】多孔質基材の少なくとも一方の面に、有機粒子を含む層（Ｉ）を有する多孔性フィルムであって、前記有機粒子がポリオレフィンを主成分とし、前記有機粒子が６０℃～１２０℃の範囲に融点を有し、熱処理前の層（Ｉ）の厚みをＤ１、１２０℃／１０分の条件で熱処理した後の層（Ｉ）の厚みをＤ２とした場合、下記式にて算出される厚み減少率が１～７５％である多孔性フィルム。Δｔ（％）＝（Ｄ１－Ｄ２）／Ｄ１×１００【選択図】なし