Elastic articles having improved unload power and a process for their production
AssigneeExxon Chemical Patents Inc.
InventorAspy K. Mehta
Life of this patent
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Abstract
Disclosed is a process for improving the unload power of a precursor elastic film comprising orienting the film to a draw ratio in the range of about 2:1 to about 20:1 followed by annealing. Further disclosed is an elastic film oriented to a draw ratio in the range of about 2:1 to about 20:1 and comprising a copolymer of ethylene polymerized with at least one comonomer selected from the group consisting of C.sub.3 to C.sub.20 alpha-olefins and C.sub.3 to C.sub.20 polyenes, wherein the copolymer has a density in the range of about 0.855 g/cm.sup.3 to about 0.9 g/cm.sup.3, a melt index in the range of about 0.5 to about 50, with a composition distribution index at least about 45 percent.
Claims26
A process for improving the unload power of a precursor elastic film comprising orienting and annealing the film wherein the orientation is to a draw ratio in the range of about 2:1 to about 20:1 and the annealing is at a temperature between the softening point and melting point of the elastic film and the precursor film comprises a plastomer selected from the group consisting of ethylene polymerized with at least one comonomer selected from the group consisting of C.sub.3 to C.sub.20 alpha-olefins and C.sub.3 to C.sub.20 polyenes, the plastomer has a density in the range of about 0.855 g/cm.sup.3 to about 0.9 g/cm.sup.3, a melt index in the range of about 0.2 to about 100 dg/min, a molecular weight distribution in the range of about 1.5 to about 30 and a Composition Distribution Breadth Index (CDBI) of at least about 45 percent.
An elastic film having been orientated to a draw ratio in the range of about 2:1 to about 20:1 said film comprising a plastomer selected from the group consisting of ethylene polymerized with at least one comonomer selected from the group consisting of C.sub.3 to C.sub.20 alpha-olefins and C.sub.3 to C.sub.20 polyenes, said plastomer having a density in the range of about 0.855 g/cm.sup.3 to about 0.9 g/cm.sup.3, a melt index in the range of about 0.5 to about 50, and a composition distribution breadth index of at least about 45 percent.
An elastic film having improved unload power, comprising the product of orienting and annealing a precursor elastic film to a draw ratio in the range of about 2:1 to about 20:1 and the precursor film comprises a plastomer selected from the group consisting of ethylene polymerized with at least one comonomer selected from the group consisting of C3 to C20 alpha-olefins and C3 to C20 polyenes, the plastomer has a density in the range of about 0.855 g/cm3 to about 0.9 g/cm3, a melt index in the range of about 0.2 to about 100 dg/min, a molecular weight distribution in the range of about 1.5 to about 30, and a Composition Distribution Breadth Index (CDBI) of at least about 45 percent.
Dependencies are inferred from the claim text.