POROUS POLYPROPYLENE FILM

PURPOSE: A porous polypropylene film is provided to form uniform pores on a whole film by a method drawing β-crystallized polypropylene undrawn sheet to longitudinal direction and transversal direction at the same time, thereby capable of being used as a separator with various uses, especially suita...

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Bibliographische Detailangaben
Hauptverfasser:	HEO, HYE YOUNG, SON, YANG SOO, KIM, MIN JU, JU, JAE SEOG, KIM, SOO HEE
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOSITIONS BASED THEREON ELECTRICITY GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE: A porous polypropylene film is provided to form uniform pores on a whole film by a method drawing β-crystallized polypropylene undrawn sheet to longitudinal direction and transversal direction at the same time, thereby capable of being used as a separator with various uses, especially suitable as a separator for a lithium secondary battery. CONSTITUTION: A porous polypropylene film is manufactured by drawing β-crystallized polypropylene undrawn sheet to longitudinal direction and transversal direction at the same time. The standard deviation of the Gurley air permeability along longitudinal direction is 1-10 sec/100ml. The standard deviation of the air permeability along transversal direction comprises is 1-15 sec/100ml. A manufacturing method of β-crystal nucleating agent comprising composition comprises: a step of manufacturing a β-crystallized polypropylene undrawn sheet by melt-extruding, and cooling a composition comprising a polypropylene resin, and a β-crystal nucleating agent; and a step of drawing the polypropylene undrawn sheet along longitudinal direction and transversal direction at the same time, and thermal-setting the sheet.