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    • 1. 发明授权
    • Insulating material for coaxial cable, coaxial cable and method for producing coaxial cable
    • 同轴电缆绝缘材料,同轴电缆及同轴电缆的制造方法
    • US06335490B1
    • 2002-01-01
    • US08659669
    • 1996-06-05
    • Takashi HigashikuboToshihiro ZushiHirokazu KuzushitaTamotsu Kaide
    • Takashi HigashikuboToshihiro ZushiHirokazu KuzushitaTamotsu Kaide
    • H01B700
    • C08J9/0061C08J9/122C08J2323/02C08J2427/00H01B3/441H01B3/445H01B11/1839
    • An insulating material for coaxial cables, made at least in part with a polyolefin resin capable of heat-melt extrusion and a fluororesin powder as a nucleator, which material being capable of foam extrusion in the presence of a foaming agent; a coaxial cable made at least in part with a foam insulating layer prepared from the insulating material; and a method for producing a coaxial cable, by extruding, on a conductor, the insulating material to form a foam insulating layer. The insulating material for coaxial cables of the present invention containing a fluororesin powder such as PTFE as a nucleator provides a foamed article having fine and uniform cells, and a high expansion ratio. Such foamed article is superior in electric properties, and the coaxial cable having such insulating layer is superior in attenuation property. The material of the invention can obviate drying of the insulating layer, which contributes to an improved production efficiency of the coaxial cable and reduced production cost. In addition, the insulating material of the present invention is beneficially economical.
    • 用于同轴电缆的绝缘材料,至少部分由能够热熔挤出的聚烯烃树脂和作为成核剂的氟树脂粉末制成,该材料能够在发泡剂存在下进行泡沫挤出; 至少部分地由绝缘材料制成的泡沫绝缘层制成的同轴电缆; 以及通过在导体上挤出绝缘材料以形成泡沫绝缘层来制造同轴电缆的方法。 含有氟树脂粉末如PTFE作为成核剂的本发明的同轴电缆绝缘材料提供了具有细小均匀的电池和高膨胀率的发泡制品。 这种发泡制品的电性能优异,并且具有这种绝缘层的同轴电缆的衰减特性优异。 本发明的材料可以避免绝缘层的干燥,这有助于提高同轴电缆的生产效率并降低生产成本。 此外,本发明的绝缘材料是有利的。
    • 3. 发明授权
    • Foamable composition and coaxial cable having insulating foam layer
    • 具有绝缘泡沫层的可发泡组合物和同轴电缆
    • US06492596B1
    • 2002-12-10
    • US09616307
    • 2000-07-14
    • Takashi HigashikuboHirokazu KuzushitaAkito Niboshi
    • Takashi HigashikuboHirokazu KuzushitaAkito Niboshi
    • H01B1700
    • C08J9/0061C08J9/12C08J2323/06C08J2423/00C08J2427/00C08K2003/385C08L23/06C08L27/12C08L2205/02H01B3/441C08L2666/04
    • A foamable composition containing a base polymer containing a polyethylene mixture of a low density-polyethylene having a density of 0.91-0.925 g/cm3 and a high density polyethylene having a density of 0.94-0.97 g/cm3, and a fluororesin powder and/or a boron nitride powder as a nucleator, wherein the high density polyethylene has an swelling ratio smaller than that of the low density polyethylene and a melt flow rate greater than that of the low density polyethylene, and is contained in a proportion of not less than 50 percent by weight of the polyethylene mixture, and the base polymer has a shear viscosity (temperature:170° C., shear rate:1216 sec−1) of not more than 3150 poise, and a coaxial insulating cable having an electrically insulating layer formed of a foam having an expansion ratio of not less than 70% and obtained by foaming the above foamable composition are provided. The insulating layer formed from the foamable composition has superior attenuation property and can be suitably used for a feeder antenna of a portable communication device.
    • 一种可发泡组合物,其含有含有密度为0.91-0.925g / cm 3的低密度聚乙烯和密度为0.94-0.97g / cm3的高密度聚乙烯的聚乙烯混合物的基础聚合物和氟树脂粉末和/或 作为成核剂的氮化硼粉末,其中高密度聚乙烯的溶胀比小于低密度聚乙烯的溶胀比,熔体流动速率大于低密度聚乙烯的熔体流动速率,并且以不低于50的比例含有 重量百分比的聚乙烯混合物,基础聚合物具有不大于3150泊的剪切粘度(温度:170℃,剪切速率:1216秒-1),以及形成有电绝缘层的同轴绝缘电缆 的膨胀率为70%以上的泡沫体,通过使上述发泡性组合物发泡得到。 由可发泡组合物形成的绝缘层具有优异的衰减特性,可适用于便携式通信装置的馈线天线。