| 摘要 |
PROBLEM TO BE SOLVED: To enable fixing at constant temperature and constant rate irrespective of the types of paper with a toner containing a crystalline resin as a binder resin.SOLUTION: In a toner containing at least a crystalline resin as a binder resin, a ratio of tetrahydrofuran (THF) solubles of the toner having a molecular weight of 100,000 or more, which is measured by gel permeation chromatography (GPC), is 5% or more; a weight average molecular weight (Mw) of the toner is 20,000 or more and 60,000 or less; and the crystalline resin is a block polymer of polyester and polyurethane. In a diffraction spectrum obtained by an X-ray diffraction device, when the integrated intensity of the spectrum derived from a crystalline structure is (C), and the integrated intensity of the spectrum derived from an amorphous structure is (A), the toner preferably has a ratio (C)/((C)+(A)) of 0.13 or more. |
