Hollow borosilicate microspheres and method of making
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United States of America Patent
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Jul 9, 1996
Issued Date -
N/A
app pub date -
Mar 28, 1995
filing date -
Sep 8, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides hollow borosilicate microspheres having a mean particle size between 15 and 20 microns, and a true density below 0.25 g/cc. The invention also provides a method for making such microspheres comprising spray drying a solution of sodium silicate and sodium borate in a spray tower to form a precursor, milling the precursor, and heating the crushed precursor to a temperature in excess of 600.degree. F. to form hollow borosilicate microspheres.
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