| 摘要 |
A shrink film comprising a blend of copolymers of ethylene and one or more alpha-olefins having 3 to 12 carbon atoms formed in situ, said blend having a melt index in the range of about 0.2 to about 3.5 grams per 10 minutes; a melt flow ratio in the range of about 50 to about 175; a molecular weight in the range of about 90,000 to about 225,000; a Mw/Mn ratio of at least about 8; and a density in the range of 0.910 to 0.940 gram per cubic centimeter, said shrink film being formed at a blow up ratio in the range of about 2:1 to about 6:1 and having the following properties: (i) at about 135 degrees C., a shrinkage of at least about 50 percent in the machine direction and zero or positive shrinkage in the transverse direction; (ii) melt stress is zero or positive kilopascals; and (iii) a cooled stress of at least about 0.35x103 kilopascals.
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