POROUS LAMINATE

PURPOSE:To obtain a porous laminate having a high interlaminar strength and hardly generating delamination by bonding porous bodies made of polytetrafluoroethylene to each other through a vinylidene fluoride- hexafluoropropylene copolymer. CONSTITUTION:A film prepared by incorporating naphtha or the...

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Bibliographische Detailangaben
1. Verfasser:	IIMURA MITSUO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a porous laminate having a high interlaminar strength and hardly generating delamination by bonding porous bodies made of polytetrafluoroethylene to each other through a vinylidene fluoride- hexafluoropropylene copolymer. CONSTITUTION:A film prepared by incorporating naphtha or the like with PTFE powder is heated for 2min at 120 deg.C, whereby the naphtha is removed by evaporation. The film is uniaxially oriented in a longitudinal direction at a temperature of 120 deg.C to have an orientation ratio of 300%, thereafter being heated at 350 deg.C for 3min to be calcined. In this manner, a PTFE porous film having a thickness of 100mum, a 1mum diameter pore, and a void content of 68% is obtained. Twenty sheets of the porous film are prepared. Water dispersion of vinylidene fluoride-hexafluoropropylene copolymer and a hexamethylene diamine carbamate is sprayed on the surfaces thereof. The films are laminated with each other and vulcanized to form a PTFE porous laminate.