Fine hollow glass sphere and method for preparing the same
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United States of America Patent
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Mar 11, 2003
Grant Date -
N/A
app pub date -
Feb 28, 2001
filing date -
Jun 30, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
It is an object of the present invention to provide hollow glass microspheres having particle properties of a low particle density and grain size properties of a sharp grain size distribution, having a high homogeneity and having such strength that they are less likely to fracture during processing. In the present invention, a glass material containing a foaming agent and containing B.sub.2 O.sub.3 in an amount of from 9 to 20%, is subjected to wet grinding to obtain a slurry having an average particle size of at most 3 .mu.m, droplets thereof are heated, to obtain hollow glass microspheres having an average particle size of at most 15 .mu.m, a maximum particle size of at most 45 .mu.m, a particle density of at most 0.5 g/cm.sup.3 and a grain size gradient of at most 2.
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