Stable colloidal silica aquasols
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United States of America Patent
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app pub date -
Sep 23, 2002
filing date -
Mar 6, 1998
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Abstract
A stable aquasol comprising colloidal silica having a surface area of from about 700 m.sup.2/g to about 1100 m.sup.2/g, and an S- value of from about 20 to about 50; wherein said colloidal silica is not surface treated; wherein the molar ratio of SiO.sub.2/Na.sub.2O in said colloidal silica is greater than about 13.0:1 and is less than about 17.0:1; and wherein said aquasols have a percent by weight SiO.sub.2 solids level of from about 7.00 percent to about 16.80 percent is described and claimed. These stable colloidal silica aquasols demonstrate advantageously improved performance over art-known colloidal silica sols in applications such as in drainage and retention in papermaking processes.
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