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    • 24. 发明授权
    • Production of biaxially stretched film of polyamide blend
    • 生产聚酰胺共混物的双轴拉伸薄膜
    • US4120928A
    • 1978-10-17
    • US788047
    • 1977-04-15
    • Kaoru FurukawaKoichi MatsunamiToshihiko OtaTetsushi MurakamiHiroshi NagaiKazuo Tamaki
    • Kaoru FurukawaKoichi MatsunamiToshihiko OtaTetsushi MurakamiHiroshi NagaiKazuo Tamaki
    • B29C47/00B29D7/24
    • B29C47/0004B29C47/0021B29C47/0057B29K2077/00B29K2995/0072B29L2007/00
    • A process for preparing a biaxially stretched film of a polyamide blend, which comprises (1) melt extruding a polyamide blend to make an unstretched film and (2) stretching the unstretched film first in the machine direction and then in the transverse direction, or (2') stretching the unstretched film first to make a uniaxially stretched film having a plane orientation index of about 0.6 to 1.7 and then stretching the uniaxially stretched film in a direction substantially at a right angle to the direction at the previous stretching, said polyamide blend comprising 97 to 80% by weight of an .alpha.-type aliphatic polyamide (Component A) and 3 to 20% by weight of at least one polyamide (Component B) selected from the group consisting of (i) an .alpha.-type aliphatic polyamide different from the Component A, (ii) a .gamma.-type aliphatic polyamide, (iii) a non-crystalline aliphatic polyamide, and (iv) a ring-containing polyamide which contains in the molecule 0 to 50 mol % of repeating units comprising a xylylenediamine residue.
    • 一种制备聚酰胺共混物的双轴拉伸膜的方法,其包括(1)熔融挤出聚酰胺共混物以制备未拉伸膜和(2)首先在纵向然后沿横向拉伸未拉伸膜,或( 2')首先拉伸未拉伸薄膜以制备平面取向指数为约0.6至1.7的单轴拉伸薄膜,然后在与先前拉伸方向基本成直角的方向上拉伸单轴拉伸薄膜,所述聚酰胺共混物 包含97至80重量%的α型脂族聚酰胺(组分A)和3至20重量%的至少一种聚酰胺(组分B),其选自(i)不同于 (ii)γ型脂肪族聚酰胺,(iii)非结晶性脂肪族聚酰胺,和(iv)含有分子内的聚酰胺,其含有0〜50摩尔%的重复单元 包括苯二甲胺残基。