TONER
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),...
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Main Authors | , , , , , , |
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Format | Patent |
Language | English Japanese |
Published |
13.01.2022
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Subjects | |
Online Access | Get full text |
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Summary: | 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 |
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Bibliography: | Application Number: JP20200109990 |