Patent ID: 11913862
Assignee: SANYO CHEMICAL INDUSTRIES, LTD.
Field: Measurement (Instruments)
Classification: CPC G  B  C | IPC B  G

Claim 0:
1. A plurality of core-shell particles (C), each core-shell particle (C) comprising:
a core layer (P) as a matrix of silica particles containing magnetic metal oxide particles (A); and
a Shell layer (Q) that is a silica layer on a surface of the core layer (P), an average thickness the shell layer (Q) in the plurality of core-shell particles (C) being 3 to 3000 nm,
wherein a weight percentage of the magnetic metal oxide particles (A) in the core layer (P) is 60 to 95 wt % based on a weight of the core layer (P), and
the plurality of core-shell particles (C) have a particle size distribution with a coefficient of variation of 21 to 50%.