Amorphous silica-alumina spherical particles and process for preparation thereof
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United States of America Patent
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Aug 18, 1992
Grant Date -
N/A
app pub date -
Feb 26, 1990
filing date -
Feb 28, 1989
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Expired
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Abstract
Disclosed are amorphous silica-alumina spherical particles having a notched surface. The particles have a small specific surface area and a highly controlled hygroscopic property. The spherical particles are obtained by exchanging at least a part of an alkali metal ion of a P-type zeolite as the starting material with a divalent metal and firing the ion-exchanged zeolite. Since the pH value is shifted to a weakly alkaline level by the ion exchange treatment, the particles are effective as a filler for stabilizing a resin or the like when incorporated therein, and the refractive index of the particles can be made close to that of a resin in which the particles are to be incorporated.
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