Polytetrafluoroethylene porous material and process for production of
the same
    2.
    发明授权
    Polytetrafluoroethylene porous material and process for production of the same 失效
    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

    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。

    Cotton-like mixed materials, non-woven fabrics obtained therefrom and
process for production thereof
    3.
    发明授权
    Cotton-like mixed materials, non-woven fabrics obtained therefrom and process for production thereof 失效
    棉状混合物,由此得到的无纺布及其制造方法

    公开(公告)号:US5912077A

    公开(公告)日:1999-06-15

    申请号:US809843

    申请日:1997-04-01

    IPC分类号: D04H1/4382 D04H1/498 D02G3/00

    摘要: The present invention provides cotton-like mixed materials containing the PTFE fibers and other fibers uniformly and being excellent in intermingling property, non-woven fabrics obtained from the cotton-like mixed materials, and a process for preparation thereof.The split yarn having a network structure and obtained by splitting the uniaxially stretched PTFE film with the needle blade rolls in the stretched direction and the other continuous filament are fed simultaneously to the needle blade rolls rotating at high speed.

    摘要翻译: PCT No.PCT / JP95 / 01967 Sec。 371日期1997年04月1日 102(e)1997年4月1日PCT PCT 1995年9月28日PCT公布。 WO96 / 10668 PCT公开 日期:1996年04月11日本发明提供均匀的PTFE纤维等纤维,混纺性优异的棉状混合物,由棉状混合物得到的无纺布及其制备方法。 具有网状结构,通过将单轴拉伸的PTFE膜与针叶辊在拉伸方向分割并将另一连续长丝同时供给到高速旋转的针叶辊上而得到的分割纱线。