Two-component developer for developing electrostatic latent image
US10509338B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2018 |
| Grant date | Dec 17, 2019 |
| Priority date | — |
| Expiry date | Dec 10, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1133
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a two-component developer for developing an electrostatic latent image containing: toner particles having toner mother particles and an external additive on a surface of the toner mother particles; and carrier particles, wherein the external additive contains alumina particles; the alumina particles are subjected to a surface modification with a hydrophobilizing agent; among the hydrophobilizing agent existing on the surface of the alumina particles after the surface modification, a ratio of the hydrophobilizing agent in a state of being liberated from the surface is 20% or less when extraction treatment is performed under a predetermined condition; the alumina particles have a number average primary particle diameter in the range of 5 to 60 nm; and the carrier particles have a resin covering layer, and the resin covering layer is formed with an alicyclic (meth)acrylate monomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.