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US 2025/0147208 A1Published application
Microspheres comprising zirconia and alumina suitable for retroreflective articles
Assignee3M Innovative Properties Company
InventorsCraig W. Lindsay, Anatoly Z. Rosenflanz, Billy J. Frederick, Jacqueline C. Rolf, Joseph D. Engebretson, Luke E. Heinzen
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Abstract
Microspheres and retroreflective articles. In one embodiment, the microspheres comprise at least 30 wt. % alumina, at least 35 wt. % zirconia, and silica. In another embodiment, the microspheres comprise at least 30 wt. % alumina, at least 30 wt. % zirconia, and silica; wherein the wt. % zirconia is greater than the wt. % alumina.
Claims21
A retroreflective article comprising microspheres disposed on a surface of the article wherein the microspheres comprise
- at least 30 wt. % alumina,
- at least 35 wt. % zirconia, and
- silica.
Microspheres comprising:
- at least 30 wt. % alumina,
- at least 35 wt. % zirconia, and
- silica.
Microspheres comprising:
- at least 30 wt. % alumina,
- at least 30 wt. % zirconia, and
- silica;
- wherein the wt. % zirconia is greater than the wt. % alumina.
1 more element
(canceled)
Dependencies are inferred from the claim text.