The present invention includes a composition comprising (a) at least one propylene polymer coupled by reaction with a coupling amount of poly(sulfonyl azide) sufficient to increase the melt strength of the propylene polymer before coupling at least about 1.5 fold as compared with the resulting coupled propylene polymer; and (b) at least one ethylene polymer wherein the ethylene polymer is present in an amount sufficient to improve film mechanical properties of tear resistance in either the machine direction (MD) and cross direction (CD) as measured by the Elmendorf Tear method (ASTM D-1922) or dart impact strength as measured by the procedure of ASTM D-1709 or a modified method thereof in which the height from which the dart is dropped is decreased from 26″ to 10.5″ (0.66 m to 0.27 m) as compared with a film formed in the same manner using the coupled propylene polymer of (a) alone. Preferably, the propylene polymer is present in an amount of greater than about 50 weight percent of the resulting composition and the ethylene polymer is present in an amount of from about 5 to about 49 weight percent. The invention also includes any blown film blown from a composition of the invention, particularly when blown on a high or low stalk extruder or coextruded as well as the process of blowing such a film. Further, the invention includes any article comprising a composition of the invention or comprising a film of the invention. Particular embodiments are those articles including an institutional liner, consumer liner, heavy duty shipping sack, produce bag, batch inclusion bag, pouch, grocery bag, merchandise bag, packaging, cereal liner, soft paper overwrap, multi-wall bag, lamination or combination thereof, including multi-wall or multilayer configurations thereof. Further, the invention includes the use of a composition of the invention for making a blown film.
本发明包括一种组合物,该组合物包含:(a) 至少一种
丙烯聚合物,该
丙烯聚合物通过与聚磺酰
叠氮的偶联量反应而偶联,偶联量足以使偶联前
丙烯聚合物的熔体强度比偶联后
丙烯聚合物的熔体强度至少增加约 1.(b) 至少一种
乙烯聚合物,其中
乙烯聚合物的含量足以改善薄膜的机械性能,即通过 Elmendorf 撕裂法(ASTM D-1922)测量的机械方向(MD)和横向(CD)的抗撕裂性,或通过 ASTM D-1709 程序或其改进方法测量的飞镖冲击强度,其中飞镖落下的高度从 26″ 降低到 10.5″(0.66 米至 0.27 米)。优选地,
丙烯聚合物在所得组合物中的含量大于约 50%,
乙烯聚合物的含量为约 5%至约 49%。本发明还包括由本发明组合物吹制的任何吹膜,特别是在高梗或低梗挤出机上吹制或共挤出时,以及吹制这种薄膜的工艺。此外,本发明还包括任何包含本发明组合物或包含本发明薄膜的物品。具体实施例包括机构衬垫、消费者衬垫、重型运输袋、农产品袋、批量包装袋、小袋、杂货袋、商品袋、包装、谷物衬垫、软纸外包装、多层袋、层压或其组合,包括其多层或多层配置。此外,本发明还包括使用本发明的组合物制作吹膜。