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    Polymers of ethylene and, optionally, copolymerizable esters, films using such polymers and stretch hood packaging processes using such films
    2.
    发明申请
    Polymers of ethylene and, optionally, copolymerizable esters, films using such polymers and stretch hood packaging processes using such films 有权
    使用这种聚合物的乙烯聚合物和任选的可共聚的酯，使用这种膜的拉伸罩包装方法

    公开(公告)号：US20050037219A1

    公开(公告)日：2005-02-17

    申请号：US10796831

    申请日：2004-07-28

    申请人： Stefan Ohlsson ,  Bart Lauwers ,  Jan Donck ,  Jef Vaes

    发明人： Stefan Ohlsson ,  Bart Lauwers ,  Jan Donck ,  Jef Vaes

    IPC分类号： B32B27/32 ,  C08F2/38 ,  C08F210/02 ,  C08F210/16 ,  C08J5/18 ,  C08L23/08 ,  B65D1/00

    CPC分类号： B32B27/08 ,  B01J19/2415 ,  B01J2219/00006 ,  B01J2219/00094 ,  B01J2219/00108 ,  B32B27/18 ,  B32B27/32 ,  B32B27/322 ,  B32B2323/046 ,  B32B2439/00 ,  C08F210/02 ,  C08F210/16 ,  C08J5/18 ,  C08J2323/04 ,  C08J2323/08 ,  Y10T428/1328 ,  Y10T428/269 ,  Y10T428/31855 ,  Y10T428/31913 ,  Y10T428/31935 ,  Y10T428/31938 ,  C08F2/001 ,  C08F2/38 ,  C08F2/00 ,  C08F218/08 ,  C08F2500/26 ,  C08F2500/20 ,  C08F2500/04 ,  C08F2500/19 ,  C08F2500/10 ,  C08F2500/03 ,  C08F220/10

    摘要： The invention relates to a polymer comprising units derived from ethylene, said polymer having: a) a Melt Index of from 0.05 to 20 g/10 min as determined by ASTM-1238 Condition E; b) at least 10 per 1000 C-atoms of short chain branches, containing five carbon atoms or less, as determined by C13 NMR, and less than 3.5 mol %, of units derived from a copolymerizable ethylenically unsaturated ester, c) a density of from 0.90 to 0.94 g/cm3, preferably 0.91 to 0.935 g/cm3, especially 0.92 to 0.93 g/cm3 as determined by ASTM D1505, and d) a relaxation time as described herein of at least 10 s. Such polymers are obtainable by polymerization by free radical polymerization using a chain transfer agent that incorporates into the polymer chain such as an alpha-olefin, preferably propylene, as a chain transfer agent, preferably in a tubular reactor under circumstances to favor LCB formation in a down stream part of the tubular reactor. The polymer may be used for stretch hood film, preferably as a blown film coextruded tube comprising: a) a core of the above polymer; and b) a skin layer, on each side of the core which may be of the same or different composition, comprising at least 60 wt % of an LLDPE having density of 0.91 to 0.94 g/cm3 as determined by ASTM-D 1238 Condition E and hexane extractables less than 1.5 wt %, said skin layer containing less than 7500 ppm of anti-block particulates and said film having an elastic recovery after a 100% stretch of at least 40% and providing a normalized holding force per 100 μm thickness pre-stretch at 85% stretch after an initial stretch of 100% of at least 20 N/50 mm at a deformation rate of less than 10% of the starting length per second.

    摘要翻译： 本发明涉及包含衍生自乙烯的单元的聚合物，所述聚合物具有：a）通过ASTM-1238条件E测定的熔融指数为0.05至20g / 10min; b）通过C 13 NMR测定的每1000个碳原子的短链分支中至少有10个，含有5个或更少碳原子，少于3.5摩尔％的可共聚烯属不饱和酯的单体，c） 通过ASTM D1505测定的0.90至0.94g / cm 3，优选为0.91至0.935g / cm 3，特别是0.92至0.93g / cm 3，以及d）至少如本文所述的松弛时间 10秒。 这样的聚合物可以通过使用引入到聚合物链中的链转移剂（例如α-烯烃，优选丙烯）作为链转移剂通过自由基聚合进行聚合而获得，优选在管状反应器中，在有利于LCB形成的条件下 下游管状反应器的一部分。 聚合物可用于拉伸罩膜，优选用作吹塑膜共挤出管，其包含：a）上述聚合物的芯; 和b）在核心的每侧可以具有相同或不同组成的皮肤层，其包含至少60重量％的通过ASTM-D测定的密度为0.91至0.94g / cm 3的LLDPE 1238条件E和己烷提取物小于1.5重量％，所述表层含有小于7500ppm的防块状颗粒，所述膜在100％拉伸至少40％后具有弹性恢复性，并且每100个提供标准化的保持力 在小于起始长度/秒的10％的变形率的初始拉伸100％至少20N / 50mm的初始拉伸之后，将母体厚度预拉伸85％。