Electrostatic image developing toner, developer, and image forming apparatus
US9557671B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2015 |
| Grant date | Jan 31, 2017 |
| Priority date | — |
| Expiry date | Feb 28, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0906
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner, including: base particles containing a polyester resin, a colorant, and a release agent, wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C. where the glass transition temperature (Tg1st) is measured in first heating of differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has a glass transition temperature [Tg2nd (THF insoluble matter)] of 30° C. or lower where the glass transition temperature [Tg2nd (THF insoluble to matter)] is measured in second heating of differential scanning calorimetry (DSC) of the THF insoluble matter, and wherein 50% or less of the colorant is present within a region of 1,000 nm from a surface of each of the base particles toward a center thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.