Toner for developing electrostatic images
US8846285B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 2011 |
| Grant date | Sep 30, 2014 |
| Priority date | — |
| Expiry date | Oct 25, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S977/773
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An object of the present invention is to provide a toner for developing electrostatic images, which prevents a decrease in toner charge amount in the environment of high temperature and high humidity, prevents occurrence of fog and has excellent flowability.Provided is a toner for developing electrostatic images, comprising an external additive and colored resin particles comprising a binder resin and a colorant, wherein the external additive is core-shell type complex fine particles in which resin fine particles are covered with at least one inorganic component selected from the group consisting of silica, alumina, titania and zirconia, and the volume ratio of the inorganic component of the core-shell type complex fine particles is 45 to 75% by volume when the total volume of the core-shell type complex fine particles is 100% by volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.