Electrostatic image developing carrier, electrostatic image developer, process cartridge, image forming method, and image forming apparatus
View Patent ↗An electrostatic image developing carrier includes a ferrite particle that contains magnesium element in an amount of about 3.0 wt % or more and about 10.0 wt % or less and manganese element in an amount of about 0.2 wt % or more and less than about 1.0 wt %; and a resin layer that covers the ferrite particle.
1. An electrostatic image developing carrier comprising:
a ferrite particle that contains magnesium element in an amount of from 3.0 wt % to 10.0 wt % and manganese element in an amount of from 0.2 wt % to 1.0 wt %; and
a resin layer that covers the ferrite particle.
2. The electrostatic image developing carrier as claimed in claim 1 , wherein the resin layer contains at least one resin selected from the group consisting of a (meth)acryl resin, a styrene-(meth)acryl resin, a polyester resin, and a silicone resin.
3. The electrostatic image developing carrier as claimed in claim 1 , wherein the resin layer contains a silicone resin.
4. The electrostatic image developing carrier as claimed in claim 1 , wherein the resin layer has a thickness of from 0.05 μm to 1.5 μm.
5. The electrostatic image developing carrier as claimed in claim 1 , wherein a covering rate of the resin layer on a surface area of the ferrite particle is 70% or more.
6. The electrostatic image developing carrier as claimed in claim 1 , wherein a covering amount of the resin relative to the ferrite particle is 0.5 wt % or more and 10 wt % or less.
7. The electrostatic image developing carrier as claimed in claim 1 , which has a shape factor SF1 of from 110 to 145.
8. An electrostatic image developer comprising:
the electrostatic image developing carrier as claimed in claim 1 ; and
a toner.
9. The electrostatic image developer as claimed in claim 8 , wherein the toner has a volume average particle size of from 2 μm to 10 μm.
10. The electrostatic image developer as claimed in claim 8 , wherein the toner has GSDp of 1.23 or less.
11. The electrostatic image developer as claimed in claim 8 , wherein the toner has a shape factor SF1 of from 110 to 140.
12. The electrostatic image developer as claimed in claim 8 , wherein the toner is manufactured by a manufacturing method comprising:
dispersing at least binder resin particles and coloring agent particles in an aqueous medium to form dispersed particles,
aggregating the dispersed particles with a metal ion to form first aggregated particles,
adding binder resin particles alone and aggregating the added binder resin particles and the first aggregated particles to form second aggregated particles, and
thermally fusing the second aggregated particles.