Aluminum phosphates and binder compositions/ceramic materials comprised thereof
AssigneeRhone-Poulenc Chimie
InventorsWilliam Fogel, Laurent Frouin
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Abstract
Novel aluminum phosphates, in particular amorphous aluminum phosphate powders having a BET specific surface no greater than 25 m.sup.2 /g, well suited as binders/hardeners or for the production of ceramic shaped articles, are prepared by reacting at least one aluminum compound, e.g., an aluminum oxide, hydroxide or oxyhydroxide, with phosphoric acid or an aluminum phosphate, e.g., an acid aluminum orthophosphate, in a liquid reaction medium devoid of inorganic acid anions other than of phosphoric acid, and then spray- or freeze-drying the suspension thus obtained.
Claims24
An aluminum phosphate product comprising amorphous aluminum phosphate having an Al/P ratio of at least 1, a specific surface area no greater than 25 m.sup.2 /g and devoid of inorganic acid anions, the aluminum phosphate product being prepared by a process which comprises creating a reactant suspension and reacting at least one aluminum compound with phosphoric acid or an aluminum phosphate, in a liquid reaction medium devoid of inorganic acid anions other than phosphoric acid, and then spray- or freeze-drying the suspension thus obtained to produce an aluminum phosphate product having a specific surface area no greater than 25 m.sup.2 /g.
Dry particulates of an amorphous aluminum phosphate having a BET specific surface no greater than 25 m.sup.2 /g.
Dependencies are inferred from the claim text.