Toner and two-component developer for electrophotographic process and image formation method and image formation apparatus using the toner
US6183926A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1999 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Oct 25, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0819
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner is made or toner particles which contains a binder resin and a coloring agent, wherein the toner particles have a weight-average particle size in a range of 6.0 to 11.5 .mu.m, and contains toner particles (a) with a particle diameter of 5 .mu.m or less in a content ratio of 1 to 15% by number, and toner particles (b) with a particle diameter of twice or more the weight-average particle size in a content ratio of 5 wt % or less, and the number-average particle size D25 and the number-average particle size D75 respectively obtained when the cumulative number of the toner particles reaches 25% and 75% at the measurement of a cumulative toner particle distribution by number thereof are in the relationship of 0.60.ltoreq.D25/D75.ltoreq.0.95. A two-component developer includes the above-mentioned toner and a carrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.