METHOD FOR PRODUCING POROUS MOLDED ARTICLE OF POLYTETRAFLUOROETHYLENE

PURPOSE:To continuously produce a thick and long porous molded article of polytetrafluoroethylene. CONSTITUTION:100 pts.wt. polytetrafluoroethylene (hereinafter abbreviated as PTFE) having 10-100 mum average particle diameter produced by suspension polymerization method is blended with 5-40 pts.wt....

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Bibliographische Detailangaben
Hauptverfasser:	HONDA NORIMASA, YUGAWA HIROKAZU
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To continuously produce a thick and long porous molded article of polytetrafluoroethylene. CONSTITUTION:100 pts.wt. polytetrafluoroethylene (hereinafter abbreviated as PTFE) having 10-100 mum average particle diameter produced by suspension polymerization method is blended with 5-40 pts.wt. binder composed of resin powder (e.g. tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) not decomposing at a burning temperature of PTFE, having a lower melting point than PTFE and 5-700 mum average particle diameter to give blended powder, which is gelatinized at >= the melting point of PTFE and < the thermal decomposition temperature of the binder. The gelatinized substance is fine by granulated into powder having 80-120 mum average particle diameter and the prepared powder is extrusion molded by a ram at < the melting point of the PTFE and at >=the melting point of the binder to give a premolded article. The premolded article is burnt at >= the molting point of PTFE and under no restricting condition.