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    • 64. 发明授权
    • Vinylidene fluoride resin filament and production thereof
    • 偏二氟乙烯树脂长丝及其生产
    • US4521483A
    • 1985-06-04
    • US573684
    • 1984-01-25
    • Tohru SasakiHiroyuki EndohSeiichi Ohira
    • Tohru SasakiHiroyuki EndohSeiichi Ohira
    • A01K75/00D01F8/10D02G3/00B29F3/10B32B23/00
    • D01F8/10Y10T428/2929Y10T428/2933Y10T428/2964Y10T428/3154
    • A composite fiber comprises at least a two layer structure of a sheath and a core, each layer comprising a vinylidene fluoride resin, the core portion having an inherent viscosity of 1.10 dl/g and the sheath portion having an apparent viscosity lower than that of the core portion, said composite fiber having a birefringence of at least 36.0.times.10.sup.-3. This composite fiber, which has excellent knot strength (as high as 91 kg/mm.sup.2), high tensile strength (as high as 103 kg/mm.sup.2), excellent luster, and high processability and productivity, is produced by preparing a composite comprising a core portion of a vinylidene fluoride resin having an inherent viscosity of at least 1.10 dl/g and at least one layer of a sheath portion covering over said core portion, which has an apparent viscosity lower than that of the vinylidene fluoride resin of the core, while at least one of the core portion and the sheath portion is in molten state, and then subjecting the composite to at least one-step stretching to a stretching degree of 5.0-fold or more at a temperature which is lower by 5.degree. C. or more but not lower by 30.degree. C. or more than the melting point of the resin of the core.
    • 复合纤维包括至少两层护套和芯层结构,每层包含偏氟乙烯树脂,核心部分的特性粘度为1.10dl / g,鞘部分的表观粘度比 芯部分,所述复合纤维的双折射率至少为36.0×10 -3。 该复合纤维通过制备包含芯的复合材料来生产,其具有优异的结强度(高达91kg / mm2),高拉伸强度(高达103kg / mm2),优异的光泽和高加工性和生产率 具有至少1.10dl / g的特性粘度的至少一个偏氟乙烯树脂的部分和覆盖在所述芯部上的至少一层鞘部分,其表观粘度低于芯的偏二氟乙烯树脂的表观粘度,同时 核心部分和鞘部分中的至少一个处于熔融状态,然后在低于5℃的温度下对复合材料进行至少一步拉伸至5.0倍以上的拉伸度,或 更多但不低于30℃或更高于芯的树脂的熔点。