Particulate zinc oxide with manganese ion dopant
View Patent ↗A particulate metal oxide is provided that includes a cationic portion containing a zinc portion, a first manganese dopant portion and a second dopant portion selected from the group consisting of iron and aluminum, wherein the zinc portion is about 99% by weight or more of the cationic portion and the manganese dopant portion and second dopant portion are present in a weight ratio of from about 5:1 to 1:5.
1. A particulate metal oxide comprising a cationic portion, wherein the cationic portion comprises about 99% by weight or more of a zinc portion, a first manganese dopant portion and a second dopant portion selected from the group consisting of iron and aluminum, wherein the first manganese dopant portion and the second dopant portion are present in a weight ratio from about 1:5 to about 5:1.
2. The particulate metal oxide of claim 1 having a Long-Short Absorbance Ratio that is greater than a Long-Short Absorbance Ratio of a comparable particulate metal oxide.
3. The particulate metal oxide of claim 1 , wherein the first manganese dopant portion and the second dopant portion are present in a weight ratio from 1:4 to about 4:1.
4. The particulate metal oxide of claim 1 , wherein the first manganese portion and the second dopant portion are present in a weight ratio from 1:3 to about 3:1.
5. The particulate metal oxide of claim 1 wherein the second dopant portion is iron.
6. The particulate metal oxide of claim 1 wherein the second dopant portion is aluminum.
7. The particulate metal oxide of claim 1 wherein the first manganese dopant portion is divalent.
8. The particulate metal oxide of claim 1 wherein the first manganese dopant portion is divalent and the iron dopant is divalent.
9. The particulate metal oxide of claim 1 having a Long-Short Absorbance Ratio of 1.75 or greater.
10. The particulate metal oxide of claim 1 having a Long-Short Absorbance Ratio of 1.80 or greater.
11. The particulate metal oxide of claim 1 , wherein the cationic portion consists essentially of the zinc portion, the first manganese dopant portion and the second dopant portion.
12. The particulate metal oxide of claim 1 wherein the first manganese dopant portion is divalent and the second dopant portion consists essentially of a divalent iron dopant and a trivalent aluminum dopant, wherein the first manganese portion, the iron dopant and the aluminum dopant are present in a weight ratio of 1:1:2.
13. A sunscreen composition comprising a cosmetically acceptable carrier and the particulate metal oxide of claim 1 .