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    • 5. 发明授权
    • Naphthalate polyester filaments
    • 萘二甲酸酯聚酯长丝
    • US4060516A
    • 1977-11-29
    • US646645
    • 1976-01-05
    • Takatoshi KuratsujiShoji KawaseTakeo Shima
    • Takatoshi KuratsujiShoji KawaseTakeo Shima
    • C08G63/189D01F6/62C08G63/18C08G63/70
    • C08G63/189D01F6/62
    • Naphthalate polyester filaments, yarns or fibers consisting essentially of a naphthalate polyester which has an intrinsic viscosity of 0.3 to 3.5 and a softening point of at least 200.degree. C, and in which at least 85 mol% of the total recurring units consist of units of the formula ##STR1## wherein n is 4 or 6, and having at least one diffraction peak at a Bragg scattering angle 2.theta. = 16.3.degree. -- 16.7.degree. and/or 2.theta. = 25.3.degree. - 25.8.degree. in their X-ray diffraction. These filaments, yarns or fibers are useful especially as an electrically insulating material, an elastomeric reinforcing material, a fluid filter material, a paper-making canvas and a fastener component material.Of these, filaments, yarns or fibers of poly(tetramethylene 2,6-naphthalate) are prepared by melt-spinning the polymer thereby to form undrawn filaments having a birefringence of at lest 0.01 and a density of not more than 1.300, drawing the undrawn filaments in at least one step at a temperature of at least 60.degree. C. at a total draw ratio of at least 1.8, and then heat-treating the drawn filaments at a temperature higher than the temperature employed in the drawing step and within a range of 100.degree. to 240.degree. C. at constant length, under a restricted shrinkage of not more than 15%, or under a stretch of not more than 15%.
    • 萘二甲酸酯聚酯长丝,基本上由萘甲酸酯聚酯组成的纱线或纤维,其特性粘度为0.3-3.5,软化点为至少200℃,其中至少85mol%的总重复单元由 其中n为4或6,并且在其X射线衍射中在布喇格散射角2θ= 16.3°-16.7°和/或2θ= 25.3°-25.8°处具有至少一个衍射峰的式。 这些长丝,纱线或纤维特别用作电绝缘材料,弹性体增强材料,流体过滤材料,造纸帆布和紧固件组件材料。