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US 9,174,420 B2Granted
Breathable film with internal viral and alcohol barrier layer
AssigneePliant Corporation
InventorsYuhming Chen, Alfred F. Baldwin, Jr., Bradley P. Finnigan
Life of this patent
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Abstract
Multilayer breathable barrier films are provided. The films contain one or more layers of polymers without fillers in combination with at least two or more microporous breathable layers. The barrier layer provides a viral and alcohol barrier that can effectively allow moisture vapor to pass.
Claims17
A multilayer breathable barrier film comprising:
- at least one internal barrier layer that is moisture permeable, said at least one internal barrier layer comprising a hygroscopic polymer,
- at least two microporous layers each comprising a) a polyolefin and b) an adhesive, wherein said at least two microporous layers are the same or different, and said at least one internal barrier layer is disposed between said at least two microporous layers,
- wherein the internal barrier layer further comprises an adhesive.
A multilayer breathable viral and alcohol barrier film comprising:
- at least one internal viral and alcohol barrier layer that is moisture permeable, said internal layer comprising a hygroscopic polymer that is unfilled;
- at least two microporous layers each comprising a) a polyolefin, b) an adhesive, and c) an additive, wherein said at least two microporous layers are the same or different, and said at least one internal barrier layer is disposed between said at least two microporous layers;
- wherein the multilayer breathable viral and alcohol barrier film has an alcohol penetration of less than 10% as measured by Pressure Penetration Through a Fabric (PPT) testing.
Dependencies are inferred from the claim text.