Electrophotographic toner and method for producing the electrophotographic toner
US8110332B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2008 |
| Grant date | Feb 7, 2012 |
| Priority date | — |
| Expiry date | Jul 9, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09725
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided are an electrophotographic toner and a method for producing the electrophotographic toner that satisfy high image quality, cleaning stability, and high productivity.The electrophotographic toner is produced by spray-drying a toner ingredient-containing liquid, wherein the toner ingredient-containing liquid dissolves or disperses at least a resin, a low molecular mass organic material, and a colorant in an organic solvent, the resin is soluble in the organic solvent, the low molecular mass organic material is a crystalline compound or a composition of crystalline compounds that is soluble in the organic solvent, the toner ingredient-containing liquid contains substantially no particles having a particle diameter of 500 nm or more, the crystalline compound or the composition of crystalline compounds crystallizes upon spray-drying to deform toner particles into a circularity of 0.93 or higher to 0.98 or less, and volume average particle diameter of the toner particles is 3.0 μm or higher to less than 7.0 μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.