Positively-chargeable toner for developing electrostatic images and method for producing the same
US10901336B2 · kind B2 · utility
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5Claims
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Key dates
| Filing date | Feb 28, 2018 |
| Grant date | Jan 26, 2021 |
| Priority date | — |
| Expiry date | Feb 28, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09708
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a positively-chargeable toner for developing electrostatic images excellent in printing durability, charge stability, and conveyance amount stability. The toner comprises colored resin particles comprising a binder resin and a colorant, and an external additive, wherein the external additive comprises spherical silica particles with a number average particle diameter of 70 to 200 nm. wherein the external additive has a particle size distribution in which a percentage of a number of particles having a particle diameter of 50 nm or more is 75% or more, which is calculated based on a SEM image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.