Heat insulating material and method for producing same
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United States of America Patent
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Nov 19, 1996
Grant Date -
N/A
app pub date -
Jul 19, 1994
filing date -
Jul 19, 1993
priority date (Note) -
Expired
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Abstract
The heat insulator of this invention comprises a thermoformed open cell rigid polyurethane foam core enclosed in a gas barrier material and evacuated. The method of this invention comprises heating an open cell rigid polyurethane foam at a temperature not lower than the temperature at which its storage modulus of elasticity begins to decrease and enclosing the thus-thermoformed polyurethane foam in a gas barrier material and evacuating the interior of the enclosure. The heat insulator of the invention is highly heat-insulating and can be snugly applied to irregular surfaces.
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