Films comprising isotactic propylene copolymers
    6.
    发明申请
    Films comprising isotactic propylene copolymers 审中-公开
    包含全同立构丙烯共聚物的膜

    公开(公告)号:US20060004167A1

    公开(公告)日:2006-01-05

    申请号:US11216805

    申请日:2005-08-31

    IPC分类号: C08F10/00

    摘要: Films with excellent machine direction (MD) tear properties comprise at least one layer made from a polymer comprising: (A) at least 50 weight percent (wt %) propylene; and (B) at least 5 wt % ethylene and/or one or more unsaturated comonomers. Representative of component (B) unsatuarated comonomers are the C4-20 α-olefins, C4-20 dienes, styrenic compounds, and the like. Preferably, the film has at least one of a (i) haze value of less than about 10, (ii) 45 degree gloss of greater than about 65, and (iii) dart value of greater than about 100 g/mil. In one preferred embodiment, the layer comprises a compolymer characterized as having at least one of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a B-value greater than about 1.4 when the comonomer content, i.e., the units derived from ethylene and/or the unsaturated comonomer(s), of the copolymer is at least about 3 wt %, (iii) a skewness index, Six, greater than about −1.20, (iv) a DSC curve with a Tme that remains essentially the same and a Tmax that decreases as the amount of comonomer, i.e., the units derived from ethylene and/or the unsaturated comonomer(s), in the copolymer is increased, and (v) an X-ray diffraction pattern that reports more gamma-form crystals than a comparable copolymer prepared with a Ziegler-Natta (Z-N) catalyst.

    摘要翻译: 具有良好机器方向(MD)撕裂性能的膜包括由聚合物制成的至少一层,包括:(A)至少50重量%(wt%)丙烯; 和(B)至少5重量%的乙烯和/或一种或多种不饱和共聚单体。 组分(B)不饱和共聚单体的代表是C 4-14-20α-烯烃,C 4-20二烯烃,苯乙烯类化合物等。 优选地,膜具有小于约10的(i)雾度值,(ii)大于约65的45度光泽度和(iii)大于约100g / mil的飞镖值中的至少一种。 在一个优选的实施方案中,该层包含特征在于具有以下特性中的至少一个的共聚物:(i)对应于约14.6和约15.7ppm的区域误差的13 C NMR峰, 大约相同强度的峰,(ii)当共聚单体含量(即衍生自共聚物的乙烯和/或不饱和共聚单体的单元)的B值至少为约3重量%时,B值大于约1.4, (iii)偏度指数S≈大于约-1.20,(iv)具有保持基本相同的T曲线和T max ,和(v)报告更多的X射线衍射图 比使用齐格勒 - 纳塔(ZN)催化剂制备的可比共聚物更好。