Particulate zinc oxide with manganese, iron and copper dopant ions
View Patent ↗A particulate metal oxide includes a cationic portion that includes a zinc portion, a first iron dopant portion and a second dopant portion consisting of manganese and copper, where the zinc portion is about 99% by weight or more of the cationic portion, and the weight percent of the second dopant portion is greater than twice the weight percent of the first iron dopant portion.
1. A particulate metal oxide comprising a cationic portion, wherein the cationic portion comprises a zinc portion, a first iron dopant portion and a second dopant portion consisting of manganese and copper, wherein the zinc portion is about 99 percent by weight or more of the cationic portion, and wherein a weight percent of the second dopant portion is greater than twice a weight percent of the iron dopant portion.
2. The particulate metal oxide of claim 1 wherein the second dopant portion is present in a ratio to the first iron dopant portion that is at least 2.25:1.
3. The particulate metal oxide of claim 1 wherein the second dopant portion is present in a ratio to the first iron dopant portion that is at least 2.5:1.
4. The particulate metal oxide of claim 1 wherein the second dopant portion is present in a ratio to the first iron dopant portion that is at least 3:1.
5. The particulate metal oxide of claim 1 wherein the weight percent of the manganese in the second dopant portion is greater than the weight percent of the copper in the second dopant portion.
6. The particulate metal oxide of claim 1 wherein the weight percent of the copper in the second dopant portion is greater than the weight percent of the manganese in the second dopant portion.
7. The particulate metal oxide of claim 1 wherein the manganese in the second dopant portion is divalent.
8. The particulate metal oxide of claim 1 wherein the manganese in the second dopant portion is divalent and the iron dopant portion is divalent.
9. The particulate metal oxide of claim 1 wherein the manganese in the second dopant portion is divalent and the first iron dopant portion is trivalent.
10. The particulate metal oxide of claim 1 wherein the manganese dopant portion is divalent, the copper dopant portion is divalent, and the first iron dopant portion is divalent.
11. The particulate metal oxide of claim 1 , wherein the cationic portion consists essentially of the zinc portion, the first iron dopant portion and the second dopant portion consisting of manganese and copper.
12. A sunscreen composition comprising a cosmetically acceptable carrier and the particulate metal oxide of claim 1 .