Stabilized aqueous aluminum zirconium solutions
The present invention describes a method and compositions by which introducing PO 4 −3 ion at particular stage in the preparation of aluminum/zirconium solutions surprisingly results in significantly improved zirconium molecular weight stability.
1. 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.
2. The composition of claim 1 wherein the phosphate ion is PO 4 −3 .
3. The composition of claim 1 wherein (Al+Zr):Cl is present in a molar ratio of about 0.3:1 to about 2.5:1.
4. The composition of claim 3 wherein the phosphate ion is PO 4 −3 .
5. 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.
6. 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.
7. 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.
8. The composition of claim 7 wherein the phosphate ion to zirconium ion ratio is about 0.02:1-0.151:1 weight/weight.
9. The composition of claim 7 wherein the zirconium ion source is a Zr(CO 3 ) 2 paste.
10. The composition of claim 7 wherein the zirconium ion source is zirconium oxychloride.
11. The composition of claim 7 wherein the buffer is a glycine buffer.
12. The composition of claim 7 wherein the phosphate ion is PO 4 −3 .
13. The composition of claim 7 wherein the Al:Zr molar ratio is about 2:1 to about 10:1.
14. The composition of claim 7 wherein the (Al+Zr):Cl molar ratio is about 0.9:1 to about 2.1:1.