High pH dispersible nano-aluminas
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United States of America Patent
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Sep 5, 2006
Grant Date -
Oct 27, 2005
app pub date -
Apr 26, 2004
filing date -
Apr 26, 2004
priority date (Note) -
Expired
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Abstract
A process for producing nano sized boehmite aluminas which are stable at alkaline pH values wherein an aqueous medium of a peptized boehmite alumina is treated with a water dispersible polycarboxylic acid polymer and optionally with an organic water dispersible base having a molecular weight ranging from 500 to 3000 and having no more than three basic groupings to produce a treated boehmite alumina which forms a stable sol at a pH of greater than 6, the treated boehmite alumina having a dispersed particle size of less than 500 nm in the sol.
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