Self-deagglomerating suspensions of titanium (IV) oxides and methods for making them
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United States of America Patent
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Feb 14, 2012
Grant Date -
Jun 10, 2010
app pub date -
Dec 20, 2007
filing date -
Dec 21, 2006
priority date (Note) -
Expired
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Abstract
A process for making a self-deagglomerating suspension, in particular, a suspension which self-deagglomerates to form a substantially transparent suspension, of finely divided titanium (IV) oxide particles, comprising: vigorously mixing (a) a volume of a first component comprising a major proportion of an alcohol, a minor proportion of a titanium alkoxide and a minor proportion of a titanium alkoxide activator selected from the group consisting of water and a first aqueous base, and (b) a volume of a second component selected from the group consisting of water and a second aqueous base, at least one of the first component or the second component having a base therein, the second component being substantially free of alcohol, to form a mixture comprising a suspension of finely divided titanium (IV) oxide particles, the mixture having a water to titanium molar ratio ranging from about 40 to about 1 to about 5000 to about 1, wherein the proportion of the titanium alkoxide, the proportion of the activator, the mixing vigor, and the ratio of the volume of the first component to the volume of the second component are effective for the mixture to be initially opaque and subsequently spontaneously form into a substantially optically transparent suspension.
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