Toner for developing electrostatic image and image forming method
US6040103A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1997 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | Sep 2, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/08782
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner for developing an electrostatic image is composed of toner particles each containing at least a binder resin, a colorant, and a wax. The wax satisfies conditions of: (a) showing a maximum heat-absorption peak in a region of 50-130.degree. C. on temperature increase on a DSC (differential scanning calorimeter) curve, and (b) giving a .sup.13 C-NMR (nuclear magnetic resonance) spectrum showing a total peak area S in a range of 0-50 ppm, a total peak area S1 in a range of 36-42 ppm and a total peak area S2 in a range of 10-17 ppm satisfying: EQU 1.0.ltoreq.(S1/S).times.100.ltoreq.10, 1.5.ltoreq.(S2/S).times.100.ltoreq.15, and S1<S2. The wax satisfying the above-conditions has an appropriately branched long-chain structure and provides the toner with a good balance of good low-temperature fixability and anti-hot-temperature offset characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.