Glass microbubbles
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United States of America Patent
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-
Aug 30, 1988
Grant Date -
N/A
app pub date -
Jan 12, 1987
filing date -
Jan 12, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Glass microbubbles having, on a weight basis, a composition consisting essentially of 70-80% SiO.sub.2, 8-15% CaO, 3-8% Na.sub.2 O, and 2-6% B.sub.2 O.sub.3, and about 0.2-1.5% SO.sub.3 and having a CaO:Na.sub.2 O ratio of 1-3.5. These microbubbles, which are made of significantly less expensive raw materials than conventional products, can also be made with a higher percent 'floaters' and a lower average density. Certain substitutions can be made for at least a portion of each of the first three oxides.
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