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US 5,512,403 AGranted
Mixture of carrier particles useful in electrographic developers
AssigneeEastman Kodak Company
InventorsDinesh Tyagi, William E. Yoerger
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AssigneeEastman Kodak Company
InventorsDinesh Tyagi, William E. Yoerger
Estimating the term…
The invention provides a mixture of coated carrier particles suitable for use in dry electrographic developer wherein each of the types of carrier particles occupies a position in the triboelectric continuum different from the position of the other type and the level of charge to which the mixture of carrier particles charges the toner in a developer continuously increases or decreases between a high level in which said mixture comprises all of one type of carrier particles to a low level in which said mixture comprises all of the other type of carrier particles. This type of carrier provides a simple way to adjust the charge on the toner provided by the carrier, that is, more of one of the types of carrier particles in the mixture can be added to the toner to either increase or decrease the charge on the toner.
A mixture of carrier particles useful in electrographic developers comprising toners and carrier particles, said mixture comprises at least a first type of carrier particles and a second type of carrier particles, wherein said first type of carrier particles occupies a position in the triboelectric continuum different from the position in the triboelectric continuum occupied by said second type of carrier particles, said positions determined relative to said toner, and the level of charge to which said mixture of carrier particles charges said toner in a developer composition continuously decreases from a high level when said carrier mixture comprises all of said first type of carrier particles to a low level when said carrier mixture comprises all of said second type of carrier particles, and wherein said first and said second types of carrier particles comprise hard ferrite, and said mixture of carrier particles is employed in combination with a magnetic applicator comprising a rotatable magnetic core and an outer non-magnetizable shell.
A mixture of carrier particles useful in electrographic developers comprising toners and carrier particles, said mixture comprises at least a first type of carrier particles and a second type of carrier particles, wherein said first type of carrier particles occupies a position in the triboelectric continuum different from the position in the triboelectric continuum occupied by said second type of carrier particles, said positions determined relative to said toner, and the level of charge to which said mixture of carrier particles charges said toner in a developer composition continuously decreases from a high level when said carrier mixture comprises all of said first type of carrier particles to a low level when said carrier mixture comprises all of said second type of carrier particles, and wherein at least said first and second types of carrier particles comprise cores having nonionic polymeric coatings, and wherein said first and said second types of carrier particles comprise hard ferrite, and said mixture of carrier particles is employed in combination with a magnetic applicator comprising a rotatable magnetic core and an outer non-magnetizable shell.
The process of changing the toner charge in a developer comprising toner and a first type of carrier particles, comprising the steps of:
Dependencies are inferred from the claim text.