Electrostatically charged image developing toner and electrostatically charged image developing two-component developer
US10241432B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2017 |
| Grant date | Mar 26, 2019 |
| Priority date | — |
| Expiry date | Oct 18, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09725
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrostatically charged image developing toner includes a particulate toner matrix containing an external additive on the surface of the particulate toner matrix. The external additive includes silica particles A and silica particles B. The silica particles A have a number average primary-particle diameter in the range of 40 to 100 nm and an average circularity in the range of 0.50 to 0.90, and are surface-modified with silicone oil. The silica particles B have a number average primary-particle diameter of 25 nm or more and smaller than the number average primary-particle diameter of the silica particles A, and are surface-modified with alkylalkoxysilane having a specific structure or silazane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.