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AssigneeDainippon Ink and Chemicals, Inc.
InventorsKatsunori Ohba, Katsuyuki Ogura, Masanobu Nakamura, Toshiro Kogawara, Hideki Gambayashi
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An object of the present invention is to provide a developer for electrostatic image development, which exhibits stable charge behavior during printing even when using a polyester resin and does not cause contamination of the inside of the apparatus because of less scattering of the toner, and also facilitates easy maintenance. The developer for electrostatic image development of the present invention comprises colored resin particles comprising at least a binder resin and a colorant, and a magnetic carrier, wherein a proportion of said colored resin particles having a particle diameter in a range of from 12 μm to 16 μm, inclusive, in said developer and a specific charge amount of said colored resin particles meet the following expression (1): 5.18+0.12×A<B (1) (where A represents a proportion (% by volume) of colored resin particles having a particle diameter in a range of from 12 μm to 16 μm, inclusive, and B represents a specific charge amount Q/M (μC/g) of colored resin particles having a particle diameter in a range of from 12 μm to 16 μm, inclusive).
A developer for electrostatic image development comprising colored resin particles comprising at least a binder resin and a colorant, and a magnetic carrier, wherein a proportion of said colored resin particles having a particle diameter in a range of from 12 μm to 16 μm, inclusive, in said developer and a specific charge amount of said colored resin particles meet the following expression (1):
Dependencies are inferred from the claim text.