TWO-COMPONENT DEVELOPER FOR ELECTROSTATIC LATENT IMAGE DEVELOPMENT
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United States of America Patent
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Issued Date -
Jul 21, 2016
app pub date -
Jan 8, 2016
filing date -
Jan 8, 2016
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Abstract
A two-component developer for electrostatic latent image development includes: toner particles obtained in such a manner that an external additive is attached to a surface of toner base particles containing at least a binder resin; and carrier particles obtained in such a manner that a surface of core particles is coated with a resin for coating, wherein the toner particles have a volume-average particle size of 3 μm or more and 5 μm or less, the core particles have porosity of 8% or less, and the carrier particles have a volume-average particle size of 15 μm or more and 30 μm or less, volume resistivity of 1×108 Ω·cm or more and 1×1010 Ω·cm or less, a true specific gravity of 4.25 g/cm3 or more and 5 g/cm3 or less, and a shape factor SF-1 of 105 or more and 125 or less.
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