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    • 10. 发明授权
    • Coextruded, biaxially oriented multilayer film
    • 共挤出双轴取向多层膜
    • US4975329A
    • 1990-12-04
    • US274334
    • 1988-11-21
    • Lothar BotheGuenther CrassGunter SchloeglThomas Wilheim
    • Lothar BotheGuenther CrassGunter SchloeglThomas Wilheim
    • B29C55/12B29K23/00B29K105/34B29L9/00B32B27/32C08L23/12H01B17/60H01G4/18
    • H01G4/18B32B27/32C08L23/12C08L23/06C08L23/0815C08L23/10C08L23/20C08L53/00Y10S428/91Y10T428/31692Y10T428/31913
    • A coextruded, biaxailly oriented multilayer film comprises a base layer comprising an extremely pure raw material and outer layer. It is suitable for use as an electrically insulating film, as a dielectric in an electrical capacitor, and has improved dielectrical properties for this purpose. The base layer and the outer layer or layers contain propylene polymer on one or both sides and stabilizers for propylene polymers. The raw material for the base layer has an idealized thermal oxidation temperature in the range of 260.degree. to 300.degree. C., preferably in the range 260.degree. to 280.degree. C., and the raw material for the outer layer or layers has an idealized thermal oxidation temperature in the region of 240.degree. to 300.degree. C., preferably in the range 240.degree. to 270.degree. C. The multilayer film as a whole has an idealized thermal oxidation temperature in the range 250.degree. to 290.degree. C., in paticular in the range 250.degree. to 275.degree. C. The content of organic neutralizing agents, in particular calcium stearate, in the raw materials is less than or equal to 100 ppm.
    • 共挤出的双轴取向多层膜包括包含极纯原料和外层的基层。 它适合用作电绝缘膜,作为电容器中的电介质,并且为此目的具有改进的介电特性。 基层和外层或层在一侧或两侧含有丙烯聚合物和用于丙烯聚合物的稳定剂。 用于基层的原料具有理想的热氧化温度在260℃至300℃的范围内,优选在260℃至280℃的范围内,而外层的原料具有理想的 热氧化温度在240℃至300℃的范围内,优选在240℃至270℃的范围内。多层膜整体具有理想的热氧化温度在250°至290℃的范围内, 在250〜275℃的范围内,原料中的有机中和剂,特别是硬脂酸钙的含量小于或等于100ppm。