Toner for electrostatic latent image development
US8999620B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 2013 |
| Grant date | Apr 7, 2015 |
| Priority date | — |
| Expiry date | Jul 30, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09321
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner for electrostatic latent image development, containing toner particles composed of toner core particle containing at least a binder resin and a shell layer coating the toner core particle. Average circularities D4 to D7 of toner particles within predetermined particle diameter ranges are each no less than 0.960, the difference (Dmax−Dmin) between a maximum value Dmax among D4 to D7 and a minimum value Dmin among D4 to D7 is no greater than 0.015. The shell layer is smoothened to a predetermined level. And, cracks in a direction approximately perpendicular to a surface of the toner core particles are observable inside the shell layer when cross-section of the toner particle is observed using a transmission electron microscope.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.