| 摘要 |
<p>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 from 0.2 to 3.5 grams per 10 minutes; a melt flow ratio in the range of from 50 to 175; a molecular weight in the range of from 90,000 to 225,000; a Mw/Mn ratio of at least about 8; and a density in the range of from 0.910 to 0.940 gram per cubic centimeter, the shrink film being formed at a blow up ratio in the range of from 2:1 to 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 0.35 x 10<3> kilopascals.</p> |
