Manufacturing process for hollow microspheres
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United States of America Patent
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-
Dec 13, 1983
Issued Date -
N/A
app pub date -
Sep 21, 1982
filing date -
Apr 13, 1981
priority date (Note) -
Expired
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Abstract
More perfect, less porous hollow microspheres can be prepared by spray-drying dispersions of film-forming solids that contain certain organic solvents. The organic solvents are water-miscible and have boiling points of 100.degree. C. or more. The solvent is added just prior to spray drying and the resulting product has fewer cracks and/or holes. This improvement is especially beneficial to preparation systems involving alkali metal silicates and 'polysalts.'
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