Silica gel comprising guanidine carbonate
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United States of America Patent
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Oct 30, 2012
Grant Date -
Jan 19, 2006
app pub date -
Jul 7, 2003
filing date -
Jul 10, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process of preparing a silica sol is described. The process involves reacting a fresh sol with guanidine carbonate. The reaction may be conducted in the presence of a base (e. g. , sodium water glass), and at a pH of from 8 to 12. The process of the present invention may also include concentrating steps. The silica sol prepared by the method of the present invention has a BET surface area of greater than or equal to 100 m2/g, and contains from 0.05 to 15% by weight of gaunidinium ions, based on the total weight of the silica gel.
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