Moisture-imprevious panel capable of delayed hydration
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United States of America Patent
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Oct 1, 1991
Grant Date -
N/A
app pub date -
Feb 15, 1990
filing date -
Feb 15, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A flexible or rigid panel, and method of making the panel, useful as a water barrier including an intermediate layer of a water-swellable colloidal clay, such as pentonite, sandwiched between two layers of sheet material, such as woven or non-woven fabric, or paperboard, wherein at least one one of the sheet material layers has a water-soluble coating material covering substantially the entire outer surface of the sheet material layer. The water-soluble coating is a material that dissolves upon a predetermined water contact period, having a controlled, predetermined water-solubility so that the intermediate water-swellable clay layer is protected against hydration during installation.
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