ELECTROSTATIC IMAGE DEVELOPING TONER, ELECTROSTATIC IMAGE DEVELOPER, TONER CARTRIDGE, PROCESS CARTRIDGE, IMAGE FORMING DEVICE, AND IMAGE FORMING METHOD

• Main Authors: FUNABA KOJI, ISHIHARA YUKA
• Format: Patent
• Language: English; Japanese
• Published: 06.04.2023
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide an electrostatic image developing toner which is superior in terms of both fixability and thermal agglomeration resistance.SOLUTION: An electrostatic image developing toner is provided, comprising toner particles containing a binder resin comprising 90 mass% or more of an amorphous resin. On a differential molecular weight distribution curve based on gel permeation chromatography of tetrahydrofuran solubles, the electrostatic image developing toner has a maximum peak Ma in a molecular weight range of 2500 to 8000, inclusive, a minimum value Mm in a molecular weight range of 8000 to 280,000, non-inclusive, and a maximum peak Mb in a molecular weight range of 280,000 to 900,000, inclusive. An area ratio A/B is in a range of 5.5 to 10, inclusive, where A represents area of the differential molecular weight distribution curve with a molecular weight of 100 or greater and less than the minimum value Mm and B represents area of the differential molecular weight distribution curve with the minimum value Mm or grater and a molecular weight of 10,000,000 or less.SELECTED DRAWING: None 【課題】定着性及び耐熱凝集性の両方に優れる静電荷像現像用トナーを提供すること。【解決手段】非晶性樹脂を９０質量％以上で含む結着樹脂を含有するトナー粒子を有し、テトラヒドロフラン可溶分のゲルパーミエーションクロマトグラフィによる微分分子量分布曲線において、分子量２５００以上８０００以下の範囲に最大ピークＭａ、分子量８０００超え２８０，０００未満の範囲に最小値Ｍｍ、及び、分子量２８０，０００以上９００，０００以下の範囲に最大ピークＭｂを有し、分子量１００以上かつ前記最小値Ｍｍ未満の微分分子量分布曲線の面積をＡ、前記最小値Ｍｍ以上かつ分子量１０，０００，０００以下の微分分子量分布曲線の面積をＢとしたとき、両者の面積比Ａ／Ｂが５．５以上１０以下である、静電荷像現像用トナー。【選択図】なし