Aluminas and Methods for Producing Same
OwnerBrian Peoples, Allison Hanninventors
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Abstract
The present invention is directed to a method for producing a modified alumina by modifying a surface of an alumina with the addition of a phosphono group containing modifier. The invention is further directed to a modified alumina produced according to the method of the present invention and to a modified alumina having specific characteristics.
Claims13
A method for producing a modified alumina including the steps of:
- i) providing an alumina, wherein the alumina is an aluminium oxyhydroxide;
- and
- ii) adding an phosphono group containing modifier to the alumina to produce a surface modified alumina.
13) A modified alumina including at least one of the following characteristics, preferably more than one of the following characteristics and most preferably all of the following characteristics after dispersion at a pH of 8 or above:
- i) an isoelectric point of at a pH of less than 4;
- ii) a dispersibility of greater than 90% when dispersed at a loading of 5, 10 or 20% into a basic solutions;
- iii) a particle size distribution having a D50 below 250 nm when dispersed at a loading of 5, 10 or 20% into a basic solutions;
- and/or, preferably and
- iv) a viscosity of less than 50 cP at 500 s−1.
Dependencies are inferred from the claim text.