公开(公告)号：US20240327270A1

公开(公告)日：2024-10-03

申请号：US18576126

申请日：2022-07-06

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Yong K. Wu ,  Mulugeta D. Dejene ,  Andrew S. D'Souza

IPC: C03C11/00 ,  B32B15/08 ,  B32B15/20 ,  B32B27/20 ,  C03C25/1095 ,  C03C25/47 ,  C08J5/18 ,  C08J5/24 ,  C08K7/28 ,  H05K1/03

CPC classification number: C03C11/002 ,  B32B15/08 ,  B32B15/20 ,  B32B27/205 ,  C03C25/1095 ,  C03C25/47 ,  C08J5/18 ,  C08J5/244 ,  C08J5/249 ,  C08K7/28 ,  H05K1/032 ,  B32B2264/101 ,  B32B2264/2032 ,  B32B2264/303 ,  B32B2307/204 ,  B32B2457/08 ,  C08K2201/005 ,  H05K2201/0129

Abstract: A plurality of glass bubbles having, in combination, a D50 size of no greater than 13 micrometers, an average true density of no greater than 0.42 grams per cubic centimeter, and a 90% crush strength of at least 55 megapascals are described. Methods of making such glass bubbles and compositions and articles such as sheet molding compounds and dielectric layers prepared from such glass bubbles are also described.