TONER FOR ELECTROSTATIC CHARGE IMAGE DEVELOPMENT, ELECTROSTATIC CHARGE IMAGE DEVELOPER, TONER CARTRIDGE, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD

• Main Authors: NAKAMURA YUKIAKI, SUGAWARA ATSUSHI, MURAKAMI TAKESHI, YOSHIDA KANA
• Format: Patent
• Language: English; Japanese
• Published: 23.05.2016
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To provide a toner for electrostatic charge image development that can form images having excellent bend resistance and scratch resistance even in forming images on thick paper as a recording medium.SOLUTION: A toner for electrostatic charge image development has a sea-island structure having a sea part including a binder resin and island parts including a mold release agent, and has toner particles having at least two maximum values of a distribution of the degrees of maldistribution of the island parts represented by the following formula (1): the degree of maldistribution B=2d/D, in which D represents the equivalent circle diameter (μm) of the toner in observation of the cross section of the toner; d represents the distance (μm) from the center of gravity of the toner to the center of gravity of the island parts including the mold release agent in the observation of the cross section of the toner.SELECTED DRAWING: None 【課題】記録媒体としての厚紙に画像を形成するときであっても、耐折り曲げ性及び耐こすり性に優れた画像を形成しうる静電荷像現像用トナーを提供すること。【解決手段】結着樹脂を含む海部と離型剤を含む島部とを持つ海島構造を有し、下記式（１）で示される前記島部の偏在度Ｂの分布の極大値が少なくとも２つ存在するトナー粒子、を有する静電荷像現像用トナーである。式（１）： 偏在度Ｂ＝２ｄ／Ｄ（式（１）中、Ｄはトナーの断面観察におけるトナーの円相当径（μｍ）を示す。ｄは、トナーの断面観察におけるトナーの重心から離型剤を含む島部の重心までの距離（μｍ）を示す。）【選択図】なし