Silica sols and use of the sols
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United States of America Patent
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Feb 18, 1997
Grant Date -
N/A
app pub date -
Feb 3, 1995
filing date -
Aug 31, 1992
priority date (Note) -
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Abstract
Silica sols with a high content of microgel and particles with a specific surface area within the range 300 to 700 m.sup.2 /g, preferably 400 to 650 m.sup.2 /g. The sols can be prepared by acidification or a water glass solution and alkalization at a certain dry content, alternatively to a certain pH. The sols are particularly suitable for use as additives in papermaking in combination with cationic polymers and especially in combination with cationic acrylamide based polymers.
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