Toner for developing electrostatic images, electrostatic image developer, and image-forming method
US7713669B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2005 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Dec 23, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/08797
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner for developing electrostatic images, comprising a binder resin and a colorant, the binder resin including a crystalline polyester resin and an amorphous resin. When, in differential scanning calorimetry of the toner according to ASTM D3418-8, the temperature of the endothermic peak derived from the crystalline polyester resin in a first heating process is defined as Tm1 (° C.), the endothermic quantity based on the endothermic peak in the first heating process is defined as ΔH1 (mW/g), and the endothermic quantity based on the endothermic peak in a second heating process is defined as ΔH2 (mW/g), Tm1 is 50 to 80° C., and ΔH1 and ΔH2 satisfy the relationship represented by the following Formula (1). When the softening temperature of the toner is defined as Tf1/2 (° C.), Tf1/2 is 85 to 135° C. Tm1 and Tf1/2 satisfy the relationship represented by the following Formula (2):0.35≦ΔH2/ΔH1≦0.95 Formula (1)Tf1/2≦205−(1.4×Tm1) Formula (2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.