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    • 8. 发明授权
    • Biodegradable packaging film
    • 可生物降解包装膜
    • US08188185B2
    • 2012-05-29
    • US12164487
    • 2008-06-30
    • James H. WangSara A. Funk
    • James H. WangSara A. Funk
    • C08B31/00
    • C08J5/18B32B5/022B32B9/02B32B9/045B32B9/047B32B27/08B32B27/12B32B27/20B32B27/205B32B27/22B32B27/36B32B2264/102B32B2264/104B32B2270/00B32B2307/50B32B2307/516B32B2307/518B32B2307/54B32B2307/7163B32B2307/724B32B2439/70C08J2303/02C08J2367/02C08J2367/04C08K3/26C08L3/02C08L3/04C08L67/02C08L67/04C08L2666/02C08L2666/18
    • A biodegradable packaging film is provided. The film is formed from a blend that contains a thermoplastic starch and polylactic acid. Starch is a relatively inexpensive natural polymer that is also renewable and biodegradable. Polylactic acid is likewise an inexpensive synthetic polymer that is biodegradable and renewable, yet also capable of providing increased tensile strength to the film. Although providing a good combination of biodegradability/renewability and increased tensile strength, the polylactic acid is also relatively rigid and can result in films having a relatively high stiffness (e.g., high modulus of elasticity) and low ductility. While more ductile than polylactic acid, the thermoplastic starch is often difficult to melt process in film forming processes and very sensitive to moisture and water vapor, reducing its ability to be used as a stand alone packaging film. In an effort to counteract the effect of such polymers, an aliphatic-aromatic copolyester is also employed in the blend of the present invention. While such copolyesters are biodegradable, they also possess the melt properties and ductility that lend them well to the formation of films. Although the combination of these polymers may achieve a good balance between biodegradability/renewability, high tensile strength, and good ductility (e.g., high peak elongation), it is still often difficult to achieve a precise set of mechanical properties as desired for packaging films. In this regard, the blend also contains a filler. Due to its rigid nature, the amount of the filler may be readily adjusted to fine tune the blend to the desired degree of ductility (e.g., peak elongation) and stiffness (e.g., modulus of elasticity).
    • 提供可生物降解的包装膜。 该膜由含有热塑性淀粉和聚乳酸的共混物形成。 淀粉是一种相对便宜的天然聚合物,也是可再生的和可生物降解的。 聚乳酸同样是廉价的合成聚合物,其是可生物降解和可再生的,并且还能够为膜提供增加的拉伸强度。 虽然提供了生物降解性/可再生性和增加的拉伸强度的良好组合,但是聚乳酸也是相对刚性的,并且可以导致具有相对高刚度(例如高弹性模量)和低延展性的膜。 虽然比聚乳酸更具延展性,但是热塑性淀粉在成膜过程中通常难以熔化,对水分和水蒸汽非常敏感,降低了其作为独立包装膜使用的能力。 为了抵消这种聚合物的作用,脂肪族 - 芳族共聚酯也用于本发明的共混物中。 虽然这种共聚酯是可生物降解的,但是它们也具有熔融性能和延展性,使其很好地形成膜。 虽然这些聚合物的组合可以在生物降解性/可再生性,高拉伸强度和良好的延展性(例如高峰值伸长率)之间达到良好的平衡,但是通常难以实现包装膜所需的精确的机械性能。 在这方面,混合物还含有填料。 由于其刚性,可以容易地调整填料的量以将共混物微调至期望的延展性(例如,峰值伸长率)和刚度(例如弹性模量)。