ELECTRET FILTER MEDIUM AND METHOD FOR MANUFACTURING THE SAME

PROBLEM TO BE SOLVED: To provide an electret filter medium which is high in surface charge density and is high in particle capture efficiency even after exposure to initial and high-temperature atmospheres and enables biodegradation treatment and a method for manufacturing the same. SOLUTION: The el...

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1. Verfasser:	TOKUDA SEIJI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CAPACITORS CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS ELECTRICITY MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROMSOLID MATERIALS OR FLUIDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an electret filter medium which is high in surface charge density and is high in particle capture efficiency even after exposure to initial and high-temperature atmospheres and enables biodegradation treatment and a method for manufacturing the same. SOLUTION: The electret filter medium having the surface charge density of ≥1.2×10-9C/cm2is obtained by impressing a DC corona electric field to a nonwoven fabric consisting of fibers composed of a lactic acid polymer prepared by compounding a crystal nucleus agent at 0.01 to 0.3 parts by weight with 100 parts by weight the lactic acid polymer as an essential component, in the state of heating the nonwoven fabric to 60 to 140°C, then cooling the nonwoven fabric down to ≤40°C in the state of impressing the electric field thereto. COPYRIGHT: (C)2003,JPO