Breathable films having increased hydrostatic head pressure
AssigneeBerry Film Products Company, Inc.
InventorToriano A. Franklin
Life of this patent
Estimating the term…
Abstract
Microporous films comprising a polymeric composition and a filler, wherein the film has an average water vapor transmission rate of at least about 16,000 grams H2O/24-hour/m2, a hydrostatic head pressure of at least about 300 mbar, and a basis weight of from about 5 gsm to about 50 gsm.
Claims20
A microporous film comprising a polymeric composition and a filler, wherein the film has an average water vapor transmission rate of at least about 20,000 grams H2O/24-hour/m2, a hydrostatic head pressure of at least about 300 mbar, and a basis weight of from about 5 gsm to about 50 gsm, and
- wherein the polymeric composition comprises less than 50% elastomeric polymer.
A multilayer microporous film comprising a polymeric composition and a filler, wherein the multilayer film has an average water vapor transmission rate of at least about 16,000 grams H2O/24-hour/m2, a hydrostatic head pressure of at least about 300 mbar, and a basis weight of from about 5 gsm to about 50 gsm, and
- wherein the multilayer film has three layers in an ABA arrangement, the A layers comprise polyethylene and calcium carbonate and the B layer comprises polyethylene, polypropylene, and calcium carbonate.
An article comprising a microporous film comprising a polymeric composition and a filler, wherein the film has an average water vapor transmission rate of at least about 16,000 grams H2O/24-hour/m2, a hydrostatic head pressure of at least about 300 mbar, and a basis weight of from about 5 gsm to about 50 gsm, and
- wherein the polymeric composition comprises less than 50% elastomeric polymer and
- wherein the polymeric composition comprises at least 30% filler.
Dependencies are inferred from the claim text.