Negatively chargeable toner and image-forming method
US6777151B2 · kind B2 · utility
6Cited by
8References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2002 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Dec 31, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0119
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a negatively chargeable toner, comprising:toner particles prepared by means of a wet granulation method; andexternal additives externally added to the toner particles, wherein the external additives comprises a first hydrophobic silica having a mean primary particle size of 5 nm to 18 nm, a second hydrophobic silica having a mean primary particle size of 18 nm to 50 nm, which is greater than that of the first hydrophobic silica, and a hydrophobic titanium oxide having a mean primary particle size of 10 nm to 40 nm, and a full color image-forming method using the negatively chargeable toner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.