TONER

• Main Authors: KAWAMURA MASASHI, TOYODA TAKAYUKI, OKUBO KENJI, YOSHIDA YU, KENMOKU TAKASHI, SHIMODA TAKU, MASUMOTO AKANE
• Format: Patent
• Language: English; Japanese
• Published: 13.01.2022
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide a toner which suppresses dissociation of a spherical external additive even after long-term use, and can suppress image stripes and image fogs.SOLUTION: A toner has toner particles containing a resin A and an external additive A, in which the resin A is a resin represented by formula (1), the resin A exists on the surface of the toner particles, the external additive A is fine particles containing silicon, an average value of a shape coefficient SF-1 of the external additive A is 105 or more and 120 or less, and an average value of a shape coefficient SF-2 of the external additive A is 100 or more and 130 or less. In the formula (1), P1 represents a polymer region, L1 is a specific connection group, at least one of R1 to R3 is a hydroxy group or an alkoxy group, the remainder each independently represents a specific substituent, and m represents a positive integer.SELECTED DRAWING: None 【課題】長期間の使用でも球形外添剤の脱離を抑制し、画像スジや画像カブリを抑制できるトナー。【解決手段】樹脂Ａを含有するトナー粒子及び外添剤Ａを有するトナーであって、該樹脂Ａが、式（１）で表される樹脂であり、該樹脂Ａは該トナー粒子の表面に存在しており、該外添剤Ａはケイ素を含有する微粒子であり、該外添剤Ａの形状係数ＳＦ－１の平均値が、１０５以上１２０以下であり、該外添剤Ａの形状係数ＳＦ－２の平均値が、１００以上１３０以下であることを特徴とするトナー。（該式（１）中、Ｐ１は高分子部位を表し、Ｌ１は特定の連結基である。Ｒ１～Ｒ３の少なくとも一つがヒドロキシ基又はアルコキシ基であり、残りはそれぞれ独立して特定の置換基を表す。ｍは正の整数を表す。）TIFF2022007196000023.tif28153【選択図】なし