Toner
US12339620B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2022 |
| Grant date | Jun 24, 2025 |
| Priority date | — |
| Expiry date | Feb 25, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0902
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner, comprising a toner particle comprising a binder resin and a water-soluble polyvalent metal salt, wherein a main component of the binder resin is a polyester resin having specific acid value, the water-soluble polyvalent metal salt is a chloride, nitrate or sulfate of the specific metal, the water-soluble polyvalent metal salt has a solubility in water at 25° C. of 30 to 200 g/100 mL, in a cross-sectional observation of the toner particle, a proportion of the area of domains having a concrete surface area, relative to the total area of domains derived from the water-soluble polyvalent metal salt, is 80 to 100 area %, the expression below is satisfied, where At (area %) denotes the proportion of the total area of domains and Fm (atomic %) denotes the proportion of the polyvalent metal atom relative to the atoms in the toner as detected by X-ray fluorescence analysis. 0.02≤At/Fm≤0.10
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.