Magnetic carrier particles
First Claim
1. Carrier particles for use in the development of electrostatic latent images which comprise a hard magnetic material having a single-phase hexagonal crystal structure doped with at least one metal that, upon substitution of said metal into said crystal structure, produces a multi-valent ion of the formula Mn+, wherein n is an integer of at least 4.
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Accused Products
Abstract
Conductive hard magnetic carrier particles are disclosed which contain a single-phase hexagonal crystal structure doped with at least one metal that, upon substitution of said metal into said crystal structure, produces a multi-valent ion of the formula Mn+, wherein n=4, 5, or 6. The carrier particles are useful in making developers for the development of electrostatic latent image patterns in an electrographic process. Also disclosed are methods for using such carrier particles in an electrographic process. Such carriers can display levels of conductivity such that the development efficiency, i.e., speed, of an electrographic process is improved.
59 Citations
62 Claims
- 1. Carrier particles for use in the development of electrostatic latent images which comprise a hard magnetic material having a single-phase hexagonal crystal structure doped with at least one metal that, upon substitution of said metal into said crystal structure, produces a multi-valent ion of the formula Mn+, wherein n is an integer of at least 4.
- 15. Carrier particles for use in the development of electrostatic latent images that comprise a hard magnetic ferrite material having a single-phase hexagonal crystal structure and represented by the formula:
- 25. An electrostatic dry developer composition for use in the development of electrostatic latent images which comprises a mixture of charged toner particles and oppositely charged carrier particles, the carrier particles comprising a hard magnetic material having a single-phase hexagonal crystal structure doped with at least one metal that, upon substitution of said metal into said crystal structure, produces a multi-valent ion of the formula Mn+, wherein n is an integer of at least 4.
- 39. An electrostatic two-component dry developer composition for use in the development of electrostatic latent images which comprises a mixture of charged toner particles and oppositely charged carrier particles, the carrier particles comprising a hard magnetic ferrite material having a single phase hexagonal crystal structure and represented by the formula:
- 49. An electrostatic single-component dry developer for use in the development of electrostatic latent images which comprises a composite of a binder and a hard magnetic material having a single-phase hexagonal crystal structure doped with at least one metal that, upon substitution of said metal into said crystal structure, produces a multi-valent ion of the formula Mn+, wherein n is an integer of at least 4.
- 57. An electrostatic single-component dry developer for use in the development of electrostatic latent images which comprises a composite of a binder and a hard magnetic material having a single-phase hexagonal crystal structure and represented by the formula:
Specification