Developer for electrostatic latent image
AssigneeKonica Minolta, Inc.
InventorsChiaki Yamada, Masahiro Anno
Life of this patent
Estimating the term…
Abstract
A developer for electrostatic latent image contains toner particles. The toner particles contain a resin and a coloring agent, and the coloring agent includes a first coloring agent, a second coloring agent, and a third coloring agent. The first coloring agent is carbon black, the second coloring agent is one or more of C. I. Pigment Violet 19 and C. I. Pigment Violet 23, and the third coloring agent is one or more of C. I. Pigment Brown 23 and C. I. Pigment Brown 25. A content of the second coloring agent is not lower than 8 mass % and not higher than 25 mass % with respect to a total amount of the coloring agents.
Claims6
A developer for electrostatic latent image, comprising toner particles,
- said toner particles containing a resin and a coloring agent,
- said coloring agent consisting of a first coloring agent, a second coloring agent, and a third coloring agent,
- said first coloring agent being carbon black,
- said second coloring, agent being one or more of C. I. Pigment Violet 19 and C. I. Pigment Violet 23,
- said third coloring agent being one or more of C. I. Pigment Brown 23 and C. I. Pigment Brown 25,
- a content of said first coloring agent being not lower than 40 mass % and not higher than 65 mass % with respect, to a total amount of said coloring agents,
- a content of said second coloring agent being not lower than 8 mass % and not higher than 25 mass % with respect to the total amount of said coloring agents, and
- a content of said third coloring agent being not lower than 20 mass % and not higher than 35 mass % with respect to a total amount of said coloring agents,
- said resin being a polyester resin having an acid value of not lower than 5 mg KOH/g and not higher than 20 mg KOH/g.
Dependencies are inferred from the claim text.