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    • 6. 发明授权
    • Compatible linear and branched ethylenic polymers and foams therefrom
    • 相容的线性和支化烯烃聚合物和泡沫
    • US06887912B2
    • 2005-05-03
    • US10743645
    • 2003-12-22
    • Nelson E. MalwitzNatarajan S. RameshShau-Tarng Lee
    • Nelson E. MalwitzNatarajan S. RameshShau-Tarng Lee
    • C08F2/00C08J9/14C08F36/04C08F136/04C08F210/00C08F236/04C08L23/00
    • C08J9/141C08J2205/052C08J2323/02
    • An expanded cellular ethylenic polymer product is provided from an irradiated, noncross-linked linear ethylenic polymer. Linear ethylenic polymers can be irradiated at ambient conditions sufficient to introduce branching in the polymer in the absence of detectable cross-linking as indicated by the absence of gels. The irradiated linear ethylenic polymer is compatible with highly branched low density polyethylene and, when mixed therewith, produces a resin having a single broad based melting temperature range as determined by direct scanning calorimetry, which indicates that the polymers in the mixture have similar crystallization behavior suitable for producing low density foams by extrusion foaming. The linear polymers can be obtained from recycled shrink wrap film. Low densities of from 0.7 to less than 4 pcf can be achieved. The foams typically have improved tear resistance as compared to previous products prepared from low density polyethylene, at comparable low densities.
    • 从照射的非交联的直链烯属聚合物提供膨胀的细胞烯属聚合物产物。 直链烯属聚合物可在不存在可检测的交联作用的情况下在足以引入聚合物中的支化物的环境条件下照射,如不存在凝胶所示。 经辐射的线性烯属聚合物与高度支化的低密度聚乙烯相容,当与其混合时,产生具有通过直接扫描量热法确定的单一宽基熔点温度范围的树脂,这表明混合物中的聚合物具有相似的结晶行为 用于通过挤出发泡生产低密度泡沫。 线性聚合物可以从再循环的收缩包装膜获得。 可实现0.7至小于4 pcf的低密度。 与以低密度聚乙烯制备的以前的产品相比,泡沫通常具有改善的抗撕裂性。
    • 10. 发明授权
    • Method for accelerating removal of residual blowing agent from extruded
flexible foams
    • 从挤出的柔性泡沫中加速除去残余发泡剂的方法
    • US5411689A
    • 1995-05-02
    • US37036
    • 1993-03-25
    • Shau-Tarng LeeAndrew Oiestad
    • Shau-Tarng LeeAndrew Oiestad
    • B29C35/02B29C37/00B29C44/56B29C44/00
    • B29C35/0277B29C44/56B29C44/5609B29C37/006B29K2105/046Y10S264/15
    • A method is disclosed for accelerating the removal of blowing agent from elongate, flexible polyolefin foam bodies, such as polyethylene foam sheeting, in the absence of substantial tension on the foam body so as to avoid breaks in the foam body. The elongate flexible foam body is introduced into a heating zone and draped over a plurality of substantially parallel bars in an endless path. Tension on the foam body is avoided because the foam loops are free hanging between these parallel bars. An endless drive means transports the parallel bars through the heating zone about the endless path, thereby transporting the foam body through the heating zone for removal of blowing agent. Forced heated air is blown over the exposed surface of the foam body at a pre-determined temperature and for a pre-determined time sufficient to remove a substantial portion of the residual blowing agent and to cause sufficient air to diffuse into the foam body so that there is no substantial reduction in the thickness of the foam.
    • 公开了一种用于在泡沫体上不存在实质张力的情况下加速从细长的柔性聚烯烃泡沫体(例如聚乙烯泡沫片)中除去发泡剂的方法,以避免泡沫体中的断裂。 细长的柔性泡沫体被引入加热区域并且在多个基本上平行的条上悬挂在环形路径中。 避免泡沫体上的张力,因为泡沫环自由悬挂在这些平行杆之间。 环形驱动装置将平行杆通过围绕环形路径的加热区输送,从而将泡沫体输送通过加热区以除去发泡剂。 强制加热的空气以预定的温度吹过泡沫体的暴露的表面,并且预定时间足以除去大部分的残留的发泡剂并引起足够的空气扩散到泡沫体中,使得 泡沫的厚度没有显着降低。