| 摘要 |
<p>Disclosed is a process for producing an elastic film of improved unload power which comprises producing a precursor film comprising an elastomer of ethylene copolymerized with a C3 to C20 alpha-olefin comonomer and/or a C3 to C20 polyene comonomer, the elastomer having a density of from 0.855 g/cm3 to 0.900 g/cm3, a melt index of from 0.2 to 1000 dg/min, a molecular weight distribution in the range of about 1.5 to 30, and a Composition Distribution Breadth Index (CDBI) of at least 45 percent; orienting the film to a draw ratio in the range of from 2:1 to 20:1; and annealing the oriented film at a temperature between the softening point and melting point of the elastomer. Further disclosed is an elastic film oriented to a draw ratio of from 2:1 to 20:1 and comprising a copolymer of ethylene polymerized with at least one comonomer selected from the group consisting of C¿3? to C20 alpha-olefins and C3 to C20 polyenes, the copolymer having a density in the range of 0.855 to 0.900 g/cm?3¿, a melt index in the range of 0.2 to 100, with a composition distribution index of at least 45 percent.</p> |
