Thermal insulating material and method of manufacturing same
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United States of America Patent
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-
Mar 19, 1996
Grant Date -
N/A
app pub date -
Oct 30, 1992
filing date -
Oct 30, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Hollow microspheres produced by the present method each have a hollow interior evacuated of gases to a predetermined pressure. A reflective material layer coats the exterior of each microsphere and, optionally, an outer layer of a protective material is applied over the reflective material layer. Permeant gases are dissolved into glass or plastic frit particles prior to heating of the frit particles to form hollow microspheres having the permeant gases contained therein. The permeant gases are subsequently out-permeated in a non-permeant gas atmosphere to substantially evacuate the interior of each microsphere. The exterior layers of reflective material and protective material are then coated about each evacuated microsphere.
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