Aluminum phosphates and binder compositions/ceramic materials comprised thereof
AssigneeRhone-Poulenc Chimie
InventorsWilliam Fogel, Laurent Frouin
Life of this patent
Estimating the term…
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.
Claims8
A process for the preparation of an aluminum phosphate having an Al/P ratio of at least 1, which comprises reacting at least one aluminum compound, comprising an aluminum oxide, an aluminum hydroxide, or an aluminum oxyhydroxide, with phosphoric acid or an aluminum phosphate, 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.
Dependencies are inferred from the claim text.