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US H1,989 H1Granted
Microporous films having zoned breathability
AssigneeKimberly-Clark Worldwide, Inc.
InventorsDavid Arthur Fell, Sarah Jane Marie Freiburger, Keith Joseph Renard
Life of this patent
Estimating the term…
Abstract
Breathable microporous films are provided having controlled regional breathability with high WVTR regions and thicker low WVTR regions. The zoned breathable microporous films are be made by selectively applying adhesive to the microporous film.
Claims13
A method of making a film having regions of varied breathability comprising:
- providing a microporous film wherein said microporous film has a hydrohead of at least 50 mbars and a WVTR of at least 800 g/m2/24 hours;
- selectively applying adhesive to a portion of said film thereby creating first and second regions within said film, said second region having dimensions of at least 3 cm by 3 cm and wherein the porosity and the WVTR is decreased within said second region of the film relative to the WVTR of the first region.
Dependencies are inferred from the claim text.