Glass composition for glass bubbles with increased compressive strength
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United States of America Patent
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Mar 8, 1994
Grant Date -
N/A
app pub date -
Mar 26, 1992
filing date -
Mar 29, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A glass composition for glass bubbles used as reinforcing fillers in plastic resin articles has an improved compressive strength and the reduced alkali amount leached from the glass. The glass composition consists essentially of, by weight percentages, SiO.sub.2 40-59%, R.sub.2 O 2-17%, R.sub.2 O being at least one selected from Li.sub.2 O, Na.sub.2 O, and K.sub.2 O, B.sub.2 O.sub.3 1-25%, RO 5-25%, RO being at least one selected from CaO, MgO, BaO, ZnO, and SrO, RO.sub.2 6-40%, RO.sub.2 being at least one selected from TiO.sub.2 and ZrO.sub.2, Al.sub.2 O.sub.3 0-13%, P.sub.2 O.sub.5 0-3%, and SO.sub.3 0.1-1.0%.
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