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    • 5. 发明申请
    • MODIFIED POLYLACTIC ACID FIBERS
    • 改性聚乳酸​​纤维
    • WO2012020335A3
    • 2012-06-07
    • PCT/IB2011053009
    • 2011-07-06
    • KIMBERLY CLARK COTOPOLKARAEV VASILY AMCENEANY RYAN JEBY TOMLARK TYLER J
    • TOPOLKARAEV VASILY AMCENEANY RYAN JEBY TOMLARK TYLER J
    • D01F6/92D01D5/08D01F1/10D01F6/62D04H1/42
    • D01F6/625B29C47/04B29K2063/00B29K2067/046B29K2105/0005B29K2995/006B29K2995/0088C08G63/08C08L67/04C08L2203/12D01D5/38D01F1/02D01F6/92D04H3/011D04H3/16Y10T428/298Y10T442/608Y10T442/615C08L23/0884
    • A method for forming biodegradable fibers is provided. The method includes blending polylactic acid with a polyepoxide modifier to form a thermoplastic composition, extruding the thermoplastic composition through a die, and thereafter passing the extruded composition through a die to form a fiber. Without intending to be limited by theory, it is believed that the polyepoxide modifier reacts with the polylactic acid and results in branching of its polymer backbone, thereby improving its melt strength and stability during fiber spinning without significantly reducing glass transition temperature. The reaction-induced branching can also increase molecular weight, which may lead to improved fiber ductility and the ability to better dissipate energy when subjected to an elongation force. To minimize premature reaction, the polylactic acid and polyepoxide modifier are first blended together at a relatively low temperature(s). Nevertheless, a relatively high shear rate may be employed during blending to induce chain scission of the polylactic acid backbone, thereby making more hydroxyl and/or carboxyl groups available for subsequent reaction with the polyepoxide modifier. Once blended, the temperature(s) employed during extrusion of the blended composition can be selected to both melt the composition and initiate a reaction of the polyepoxide modifier with hydroxyl and/or carboxyl groups of the polylactic acid. Through selective control over this method, the present inventors have discovered that the resulting fibers may exhibit good mechanical properties, both during and after melt spinning.
    • 提供了一种形成生物可降解纤维的方法。 该方法包括将聚乳酸与聚环氧化物改性剂共混以形成热塑性组合物,通过模头挤出热塑性组合物,然后使挤出的组合物通过模头形成纤维。 不受理论限制,认为聚环氧化物改性剂与聚乳酸反应并导致其聚合物骨架的支化,由此在纤维纺丝期间改进其熔体强度和稳定性而不显着降低玻璃化转变温度。 反应引起的支化也可以增加分子量,这可能导致纤维延展性改善以及在经受拉伸力时更好地耗散能量的能力。 为了使过早反应最小化,首先将聚乳酸和聚环氧化物改性剂在相对较低的温度下共混在一起。 尽管如此,在共混期间可以使用相对高的剪切速率以诱导聚乳酸骨架的断链,由此使得更多的羟基和/或羧基可用于随后与聚环氧化物改性剂反应。 一旦混合,可以选择在共混组合物的挤出过程中使用的温度以既熔化组合物又引发聚环氧化物改性剂与聚乳酸的羟基和/或羧基的反应。 通过对该方法的选择性控制,本发明人已经发现,所得到的纤维在熔体纺丝期间和之后均可表现出良好的机械性能。