Waterproof, moisture-vapor permeable sheet material and method of making the same
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United States of America Patent
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Sep 23, 1986
Grant Date -
N/A
app pub date -
Dec 4, 1984
filing date -
Dec 4, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A waterproof, moisture-vapor permeable unitary sheet material comprises a microporous polymeric matrix having pores comprising continuous passages extending through its thickness and opening into the opposite surfaces thereof, the passages being sufficiently filled with a moisture-vapor permeable, water-impermeable, hydrophilic material to prevent the passage of water and other liquids through the unitary sheet material while readily permitting moisture vapor transmission therethrough rendering the sheet material breathable. The unitary sheet is made by causing a liquid composition comprising the hydrophilic material or precursor thereof to flow into the pores of the matrix, then causing the conversion thereof to solid hydrophilic material.
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