Magnetic polymer particle for developing magnetic latent image, method of producing the same, liquid developer for magnetic latent image, cartridge, and image forming device
View Patent ↗A magnetic polymer particle develops a magnetic latent image. The magnetic polymer particle includes a magnetic component, a polymer, and a colorant. The magnetic component is a magnetic particle containing iron having a number average particle diameter of from about 0.2 μm to about 1.2 μm. The magnetic particle is contained in one magnetic polymer particle in an amount of from 1 to 10 particles. The number average particle diameter of the magnetic polymer particle is from about 2.0 μm to about 7.0 μm.
1. A magnetic polymer particle for developing a magnetic latent image:
comprising a magnetic component, a polymer, and a colorant, the magnetic component being a magnetic particle containing an iron having a number average particle diameter of from about 0.2 μm to about 1.2 μm and the magnetic particle being contained in one magnetic polymer particle in an amount of from 1 to 10 particles, and the number average particle diameter of the magnetic polymer particle being from about 2.0 μm to about 7.0 μm, wherein the content of the magnetic component is from about 2% by weight to 12.0% by weight relative to the polymer particle.
2. The magnetic polymer particle for developing a magnetic latent image according to claim 1 , wherein the saturation magnetization per unit weight of the magnetic polymer particle is from about 3.6 emu/g to about 24.0 emu/g.
3. A liquid developer for a magnetic latent image, comprising the magnetic polymer particle according to claim 1 and an aqueous medium.
4. The liquid developer according to claim 3 , wherein the content of the magnetic component is from about 2% by weight to about 10% by weight relative to the polymer particle.
5. The liquid developer according to claim 3 , wherein the saturation magnetization per unit weight of the magnetic polymer particle is from about 3.6 emu/g to about 24.0 emu/g.
6. The liquid developer for a magnetic latent image according to claim 3 , wherein the content of the magnetic polymer particle for developing a magnetic latent image is in the range of from about 1% by weight to about 20% by weight relative to the liquid developer.
7. The liquid developer for a magnetic latent image according to claim 4 , wherein the content of the magnetic polymer particle for developing a magnetic latent image is in the range of from about 1% by weight to about 20% by weight relative to the liquid developer.
8. The liquid developer for magnetic latent image according to claim 5 , wherein the content of the magnetic polymer particle for developing a magnetic latent image is in the range of about 1% by weight to about 20% by weight relative to the liquid developer.
9. The magnetic polymer particle for developing a magnetic latent image according to claim 1 , wherein the number average particle diameter of the magnetic particle containing the iron is from 0.5 μm to 0.8 μm.
10. The magnetic polymer particle for developing a magnetic latent image according to claim 1 , wherein the number of the magnetic particles contained in one magnetic polymer particle is from 1 to 4 particles.