Stabilized aqueous aluminum zirconium solutions
AssigneeSummit Research Labs, Inc.
InventorsThomas L. Harper, Allan Rosenberg, Shailesh Mehta
Life of this patent
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Abstract
The present invention describes a method and compositions by which introducing PO4−3 ion at particular stage in the preparation of aluminum/zirconium solutions surprisingly results in significantly improved zirconium molecular weight stability.
Claims14
A stabilized aqueous solution composition comprising aluminum ion, zirconium ion, phosphate ion, and chloride ion, wherein the phosphate ion to zirconium ion ratio is about 0.02:1-0.151:1 weight/weight, further wherein the zirconium is polymerically stable.
A stabilized aqueous solution composition comprising aluminum ion, zirconium ion, phosphate ion, glycine and chloride ion, wherein the glycine is at a molar ratio of about 0.5:1 to 1.5:1 with zirconium ion, and wherein Al:Zr is present in a molar ratio of about 1:1 to about 11:1, further wherein the zirconium is polymerically stable.
A stabilized aqueous solution composition comprising aluminum ion, zirconium ion, and phosphate ion, wherein the phosphate ion to zirconium ion ratio is about 0.02:1-0.151:1 weight/weight, further wherein the zirconium is polymerically stable.
A stabilized aqueous solution composition comprising aluminum ion, zirconium ion, phosphate ion, and chloride ion, made by the method comprising the steps of:
- (a) combining a chloride-containing acid and a source of phosphate ion to form a phosphate mixture;
- (b) combining the phosphate mixture with a zirconium ion source and mixing well to dissolve;
- (c) allowing the product of step (b) to stand at about room temperature for about 24 hours;
- (d) mixing a buffer at a molar ratio of about 1:1 with zirconium;
- (e) combining the product of step (d) with aqueous aluminum salt to an Al:Zr molar ratio of about 1:1 to about 11:1 and an (Al+Zr):Cl molar ratio of about 0.3:1 to about 2.5:1;
- and (f) optionally, drying to form a powder, further wherein the zirconium is polymerically stable.
Dependencies are inferred from the claim text.