Process for adjusting WVTR and other properties of a polyolefin film
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United States of America Patent
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-
Jul 10, 2001
Grant Date -
N/A
app pub date -
May 14, 1999
filing date -
Jul 31, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for rendering films, film composites, and articles made therefrom less resistant to passage of water vapor by passing a filled precursor film or film composite through the nip of interdigitating grooved rollers. The films or film composites are generally formed using a precursor film of a film forming polyolefin or polyolefin blend, with a relatively high filler loading and optionally an elastomer. A process is disclosed for making diapers or other disposable items where a relatively high water vapor is coupled with a resistance to liquid strikethrough. In one embodiment of the invention, the interdigitating grooved rollers are maintained in a temperature range of from about 91.degree. F. to about 159.degree. F.
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