Electrophotographic dry toner comprising inorganic particles
AssigneeFuji Xerox Co., Ltd.
InventorsYuka Ishihara, Chiaki Suzuki, Tetsu Torigoe, Atuhiko Eguchi, Takayoshi Aoki
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Abstract
An electrophotographic dry toner comprising toner particles having externally added thereto fine particles of an inorganic compound having been surface treated with an amphoteric surface active agent. The toner is excellent in fluidity, anti-caking properties, charging properties, and environmental stability and provides excellent images free from defects such as black spots.
Claims23
An electrophotographic dry toner comprising toner particles having externally added fine particles of an inorganic compound adhered to a surface of the toner particles, the externally added fine particles having an average primary particle diameter of from 1 to 40 nm and having been surface treated with at least an amphoteric surface active agent selected from the group consisting of .alpha.-trimethylamino fatty acid, N-alkyl-.beta.-iminopropionic acid salt, N-alkyloxymethyl-N,N-diethylbetaine, N-alkyl-N,N-diamino ethylglycine hydrochloride, 2-alkylimidazoline, aminoethylimidazoline organic acid salt, N-alkylsulfobetaine, N-alkyltaurine salt, ##STR3## wherein R is an alkyl group having 8 to 18 carbon atoms;
- R.sup.1 is an alkyl group having 7 to 17 carbon atoms;
- R.sup.2 is an alkyl group having 12 to 18 carbon atoms;
- R.sup.3 is an alkyl group having 9 to 17 carbon atoms;
- R.sup.4 is an alkyl group having 1 to 2 carbon atoms;
- R.sup.5 is an alkyl group having 9 to 17 carbon atoms;
- and n is a positive integer.
An electrophotographic dry toner comprising toner particles having externally added fine particles of an inorganic compound having been surface treated with at least an amphoteric surface active agent, wherein said amphoteric surface active agent is ##STR7##
An electrophotographic dry toner comprising dry toner particles having externally added fine particles of an inorganic compound having been surface treated with at least one amphoteric surface active agent selected from the group consisting of ##STR8##
A process for preparing an electrophotographic dry toner comprising treating fine particles of an inorganic compound with an amphoteric surface active agent selected from the group consisting of ##STR9## and adding the fine particles to toner particles.
Dependencies are inferred from the claim text.