Process for producing acidic aqueous alumina sol

Details Process for producing acidic aqueous alumina sol Process for producing acidic aqueous alumina sol

2004-03-11

2009-08-04

Kugel, Timothy J. (Department: 1796)

Colloid systems and wetting agents; subcombinations thereof; pro

Continuous liquid or supercritical phase: colloid systems;...

Aqueous continuous liquid phase and discontinuous phase...

C516S093000, C516S922000, C516S928000

Reexamination Certificate

active

07569614

ABSTRACT:
A process for producing a stable acidic aqueous alumina sol containing columnar secondary particles having a length of 50 to 400 nm which are formed by face-to-face coagulation of rectangular plate-like primary particles having a length of one side of 10 to 40 nm and a thickness of 2.5 to 10 nm when observed through an electron microscope, by use of an aqueous alkali aluminate solution and liquid or gaseous carbon dioxide as starting materials. The obtained acidic aqueous alumina sol has a low viscosity and is stable for salts. The dried gel obtained from the sol is characterized in that the gel structure thereof is rigid even though it is porous.

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