PROBLEM TO BE SOLVED: To provide an external additive for toner that suppresses excessive charging (charge-up) of toner particles.;SOLUTION: There is provided an external additive for toner comprising particles including a polyimide resin having a repeating unit represented by the following general formula (1), and a metal oxide including a metal having a valency of 2 or more (in general formula (1), X represents a tetravalent organic group having two or more carbon atoms, and Y represents a divalent organic group having two or more carbon atoms.).;SELECTED DRAWING: None;COPYRIGHT: (C)2017,JPO&INPIT
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