Process for surface modified hollow microspheres
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United States of America Patent
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-
Oct 25, 1983
Issued Date -
N/A
app pub date -
May 27, 1982
filing date -
Jun 20, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Non-fused hollow glass microspheres that consist primarily of silicate are rendered more water-resistant by treatment with multivalent metals. The hollow microspheres are slurried with water and then a solution of a multivalent metal salt such as Al.sub.2 (SO.sub.4).sub.3 is added to the slurry. The rate of the addition is controlled so that the pH can be regulated. Separating, washing and drying complete the preparation.
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