Toner for developing electrostatic image, image forming method, developing device and process cartridge
US5712070A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1996 |
| Grant date | Jan 27, 1998 |
| Priority date | — |
| Expiry date | Feb 7, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0834
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner for developing electrostatic images is constituted by toner particles comprising a binder resin and a colorant. The toner is characterized by having (i) a particle size distribution including a weight-average particle size D.sub.4 of X .mu.m and Y% by number of toner particles having a particle size of at most 3.17 .mu.m satisfying the following conditions (1) and (2): EQU -5X+35.ltoreq.Y.ltoreq.-25X+180 (1) EQU 3.5.ltoreq.X.ltoreq.6.5 (2), (ii) at least one heat absorption peak in a temperature region of at most 110.degree. C. as measured by differential thermal analysis, and (iii) a tap void of 0.45-0.70. The toner is effective for obviating the sleeve ghost phenomenon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.