TONER
To provide a toner that can provide a high-quality image in which the occurrence of offset at the rear end of a high printing ratio image has been suppressed even in a high-temperature and high-humidity environment, and a toner that can provide a high-quality image in which fogging has been suppress...
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Format: | Patent |
Sprache: | eng ; jpn |
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Zusammenfassung: | To provide a toner that can provide a high-quality image in which the occurrence of offset at the rear end of a high printing ratio image has been suppressed even in a high-temperature and high-humidity environment, and a toner that can provide a high-quality image in which fogging has been suppressed even after reception of the history of a heat cycle.SOLUTION: There is provided a toner comprising toner particles containing a binder resin, colorant, wax, and crystalline polyester, wherein in a first DSC curve obtained in the process of decreasing the temperature of the toner from 100°C to 20°C at a rate of 0.5°C/min., two or more peak tops of a crystallization peak are present from 40°C to 80°C, inclusive, and when the calorific value of the peak on the lowest temperature side of the crystallization peak is ΔH (0.5), and the calorific value of the crystallization peak on the lowest temperature side in a second DSC curve obtained in the process of decreasing the temperature of the toner similarly at a rate of 100°C/min. is ΔH (100), the ratio [ΔH(100)/ΔH(0.5)] is 2.0 or more and 6.0 or less.SELECTED DRAWING: None
【課題】高温高湿環境下においても、高印字率画像の後端オフセットの発生が抑制された高品位な画像を得ることが可能なトナー。ヒートサイクルの履歴を受けた後でもカブリの抑制された高品位な画像を得ることが可能なトナー。【解決手段】結着樹脂、着色剤、ワックス及び結晶性ポリエステルを含有するトナー粒子を有するトナーであって、該トナーを、100℃から20℃まで0.5℃/minで降温する過程で得られる第一のDSC曲線において、40℃以上80℃以下に2つ以上の結晶化ピークのピークトップが存在し、該結晶化ピークの最も低温側にあるピークの発熱量をΔH(0.5)とし、該トナーを、同様に100℃/minで降温する過程で得られる第二のDSC曲線の最も低温側にある該結晶化ピークの発熱量をΔH(100)としたときに、比〔ΔH(100)/ΔH(0.5)〕が2.0以上6.0以下であるトナー。【選択図】なし |
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