Electrostatic latent image developing magenta toner, electrostatic latent image developer, toner manufacturing method, and image forming method
US7422834B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2005 |
| Grant date | Sep 9, 2008 |
| Priority date | — |
| Expiry date | Aug 24, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/092
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrostatic latent image developing magenta toner includes at least quinacridone pigment, naphthol pigment, and a release agent. Colorant of the toner satisfies conditions (a) and (b): (a) an average primary particle size D50 of a quinacridone pigment represented by formula (1) and an average primary particle size D50 of a naphthol pigment represented by formula (2) are such that the average primary particle size D50 of the quinacridone pigment is smaller than the average primary particle size D50 of the naphthol pigment; and (b) the average primary particle size D50 of the quinacridone pigment is greater than 20 nm, and the average primary particle size D50 of the naphthol pigment is smaller than 200 nm. Formula (1):Here, each of R1, R2, R3, and R4 is selected from the group consisting of H, CH3, and Cl, R1 and R2 are different from each other, and R3 and R4 are different from each other. Formula (2):
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.