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    • 7. 发明申请
    • PEELABLE-SEAL POLYOLEFIN COMPOSITION AND SEALANT LAYER
    • 不透水密封聚烯烃组合物和密封层
    • WO9952972A9
    • 2000-01-27
    • PCT/US9908320
    • 1999-04-15
    • DOW CHEMICAL COPOPE TIMOTHY JMERGENHAGEN LAURA K
    • POPE TIMOTHY JMERGENHAGEN LAURA K
    • B32B27/32C08L23/08C08L23/20C09J123/08C09J123/20C08J5/18C08L23/16
    • C09J123/0815B32B27/32C08L23/0815C08L23/20C08L2314/06C08L2666/04C09J123/20
    • The present invention relates to an olefin sealant composition and sealant layer having easy-open heat seal characteristics. The novel composition and sealant layer are made from at least one ethylene polymer, at least 25 weight percent (based on the total weight of the composition or layer) of at least one polybutylene polymer, a silica-containing or calcium-containing additive, a slip additive and optional quantities of an ethylene polymer as additive carrier resin. The preferred ethylene polymer is a homogeneously branched ethylene polymer and the preferred polybutylene polymer has a low crystallinity or high comonomer content. As a sealant layer, the composition has excellent hot tack properties, relative low coefficient of friction and especially exceptional sealing properties wherein its heat seal strength is in the range of from 1.5 to 3.5 1bs./inch (0.27 to 0.64 kg/cm) width at 100 DEG C and the statistical average deviation of its heat seal strength between 100 DEG C to 130 DEG C sealing temperatures is less than or equal to 16.5 percent. The composition is useful in applications that require consistent and stable peelable seal performance across broad sealing windows such as, for example, cereal box liners.
    • 本发明涉及烯烃密封剂组合物和具有易开封热封特性的密封剂层。 所述新型组合物和密封剂层由至少一种乙烯聚合物制成,至少25重量%(基于组合物或层的总重量)至少一种聚丁烯聚合物,含二氧化硅或含钙添加剂, 滑爽添加剂和任选量的乙烯聚合物作为添加剂载体树脂。 优选的乙烯聚合物是均匀支化的乙烯聚合物,优选的聚丁烯聚合物具有低结晶度或高共聚单体含量。 作为密封剂层,组合物具有优异的热粘性,相对低的摩擦系数和特别优异的密封性能,其中其热封强度在1.5-3.5磅/英寸(0.27-0.64千克/厘米2) 在100℃下,其热封强度在100℃至130℃之间的密封温度的统计平均偏差小于或等于16.5%。 该组合物可用于需要在宽密封窗口(例如谷物盒衬里)上稳定且稳定的可剥离密封性能的应用中。