公开(公告)号：US20250155616A1

公开(公告)日：2025-05-15

申请号：US18836944

申请日：2023-02-28

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Craig W. Lindsay ,  Anatoly Z. Rosenflanz ,  Billy J. Frederick, JR. ,  Jacqueline C. Rolf ,  Joseph D. Engebretson ,  Luke E. Heinzen

IPC: G02B5/128 ,  C03C3/062 ,  C03C12/02 ,  C04B35/119 ,  C04B35/488 ,  E01F9/524

Abstract: Microspheres and retroreflective articles are described. In one embodiment, the microspheres comprise at least 40 wt. % alumina, at least 35 wt. % zirconia, and silica. In another embodiment, the microspheres comprise at least 80, 85, or 90 wt. % of a combination of alumina, zirconia, and silica and the microspheres have a density of at least 3.