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    • 80. 发明授权
    • Biaxially-oriented metallocene-based polypropylene films having reduced thickness
    • 双轴取向金属茂基聚丙烯薄膜,厚度减小
    • US07658875B2
    • 2010-02-09
    • US12277619
    • 2008-11-25
    • Scott D. Cooper
    • Scott D. Cooper
    • B29C55/02C08J5/18C08F210/06
    • C08F10/06C08F110/06C08F210/06C08J5/18C08J2323/12Y10S428/91C08F2500/15C08F2500/14C08F2500/12C08F2500/20C08F2500/11C08F210/16
    • A polymer film having a thickness of 10 microns or less and improved barrier characteristics to both water vapor and oxygen is formed from a biaxially-oriented polypropylene film of isotactic polypropylene. The polypropylene is prepared by the polymerization of propylene in the presence of an isospecific metallocene catalyst. The film has a permeability to water vapor of less than about 2.5 g/m2 day/25 μm and a permeability to oxygen of less than about 2200 cc/m2 day/25 μm. The film also has a haze properties of less than about 1%. The polypropylene contains 0.1 to 1% 2,1 insertions and has an isotacticity of at least 96% meso pentads. The isotactic polypropylene thus produced is then extruded into a sheet that is biaxially-oriented by stressing the sheet in the transverse and longitudinal directions to a draw ratio of at least about 6:1 in the transverse direction, and at least about 4:1 in the longitudinal direction.
    • 由全同立构聚丙烯的双轴取向聚丙烯膜形成厚度为10微米或更小并且对水蒸汽和氧气均具有改善的阻挡特性的聚合物膜。 聚丙烯通过丙烯在异相茂金属催化剂存在下的聚合制备。 该膜具有小于约2.5g / m 2日/ 25mum的水蒸气渗透性,小于约2200cc / m2 / 25mil的氧气渗透性。 该膜还具有小于约1%的雾度特性。 聚丙烯含有0.1至1%的2,1插入并且具有至少96%的内消旋五单元组的全同立构规整度。 然后将如此制备的全同立构聚丙烯挤压成双轴取向的片材,该片材沿横向和纵向施加片材的横向拉伸比至少约6:1,并且至少约4:1 纵向。