US 12,461,467 B2
Carrier for electrostatic image development, electrostatic image developer, process cartridge, image forming apparatus, and image forming method
Ryo Nagai, Kanagawa (JP); Yosuke Tsurumi, Kanagawa (JP); Yasuo Kadokura, Kanagawa (JP); and Moegi Iguchi, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Jul. 26, 2024, as Appl. No. 18/785,270.
Prior Publication US 2025/0076783 A1, Mar. 6, 2025
Int. Cl. G03G 15/08 (2006.01)
CPC G03G 15/0818 (2013.01) [G03G 15/0865 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A carrier for electrostatic image development comprising:
a core material; and
a resin coating layer that covers the core material and contains a resin and carbon black particles,
wherein the resin coating layer has an average thickness denoted as B μm and contains aggregates of the carbon black particles, the aggregates having equivalent circle diameters denoted as A μm, the aggregates satisfying formula (1) below, and
wherein, in a cross section of the resin coating layer, the ratio of the total area of the aggregates satisfying formula (1) below to the total area of the resin coating layer is 10% or more and 50% or less:

OG Complex Work Unit Math