CLOSED-CELL URETHANE SHEET, MANUFACTURING METHOD THEREOF AND WATERPROOF SEALING MATERIALS
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United States of America Patent
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Issued Date -
Feb 4, 2010
app pub date -
Jul 29, 2009
filing date -
Jul 31, 2008
priority date (Note) -
Abandoned
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Abstract
A method of manufacturing a closed-cell urethane sheet, the method includes the steps of mixing a liquid urethane raw material with thermally expandable microcapsules to obtain a liquid urethane foam raw material, coating the liquid urethane foam raw material on at least one of the opposite surfaces of a releasable substrate to form a urethane raw material sheet, and heating the urethane raw material sheet from the opposite surfaces of the urethane raw material sheet to expand and cure the urethane raw material sheet to obtain the closed-cell urethane sheet.
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