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2. 发明授权

US5688836A Polytetrafluoroethylene porous material and process for production of the same 失效
标题翻译：聚四氟乙烯多孔材料及其生产方法相同
公开(公告)号：US5688836A
公开(公告)日：1997-11-18
申请号：US211056
申请日：1994-03-25
申请人： Katsutoshi Yamamoto , Osamu Tanaka , Hirofumi Onogi
发明人： Katsutoshi Yamamoto , Osamu Tanaka , Hirofumi Onogi
IPC分类号： C08J9/00 , C08J9/24
CPC分类号： C08J9/0061 , C08J2327/18
摘要： There is provided a polytetrafluoroethylene (PTFE) porous material which has improved adhesion and improved buckling resistance on bending without a tearing problem along a tubular axial direction. The porous material is composed of a polytetrafluoroethylene and a heat-meltable resin of which melting point is lower than that of the polytetrafluoroethylene, has fibril portions and node portions and characterized in that the fibril portions are mainly of the polytetrafluoroethylene, and the heat-meltable resin mainly constitutes the node portions and hardly constitutes the fibril portions. The porous material is produced by extruding powder for paste-extrusion, which comprises particles of the polytetrafluoroethylene produced by emulsion polymerization of tetrafluoroethylene and particles of the heat-meltable resin of which melting point is lower than that of the polytetrafluoroethylene, at a temperature which is not higher than the melting point of the heat-meltable resin optionally followed by rolling so that an unsintered material is obtained, stretching the unsintered material at a temperature which is not higher than the melting point of the heat-meltable resin, and then heat setting the stretched material at a temperature which is equal to or higher than the melting point of the polytetrafluoroethylene.
摘要翻译： PCT No.PCT / JP93 / 01051 Sec。 371日期：1994年3月25日 102（e）1994年3月25日PCT提交1993年7月27日PCT公布。第WO94 / 03531号公报日期1994年2月17日提供了一种聚四氟乙烯（PTFE）多孔材料，其具有改善的粘合性和改善的弯曲抗弯曲性，而不沿管状轴向方向发生撕裂问题。多孔材料由聚四氟乙烯和熔点低于聚四氟乙烯的热熔树脂组成，具有原纤维部分和节点部分，其特征在于，原纤维部分主要是聚四氟乙烯，热熔性树脂主要构成节点部分，几乎不构成原纤维部分。多孔材料是通过挤出用于糊料挤出的粉末制造的，其包括通过四氟乙烯的乳液聚合制得的聚四氟乙烯和熔点低于聚四氟乙烯的热熔树脂的颗粒的温度在不高于可热熔树脂的熔点，任选随后进行轧制，从而获得未烧结材料，在不高于可热熔树脂的熔点的温度下拉伸未烧结材料，然后热定型在等于或高于聚四氟乙烯的熔点的温度下的拉伸材料。

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