Toner for developing electrostatic image and method of preparing the same
US8431308B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2010 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | May 23, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09392
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Toner for developing an electrostatic image, which satisfies charging stability, low-temperature fixability, high-temperature storage characteristics, and durability with respect to an environment up to a predetermined level or above, and a method of preparing the toner. The toner includes: a core layer including a first binder resin, a colorant, and a releasing agent; and a shell layer covering the core layer and including a second binder resin, wherein the first binder resin includes about 70 wt % or above of amorphous polyester resin and about 30 wt % or below of crystalline polyester resin, the second binder resin includes an amorphous polyester resin, and a melting temperature (Tm(C)) of the crystalline polyester resin, a melting temperature (Tm(W)) of the releasing agent, and a melting point (Tm(T)) of the toner satisfy the following conditions: −20° C.≦Tm(W)−Tm(C)≦20° C.; and 0° C.<Tm(C)−Tm(T)≦10° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.