Toner for developing an electrostatically charged image
AssigneeNippon Carbide Kogyo Kabushiki Kaisha
InventorsYukinobu Hasegawa, Hiroyoshi Shimomura, Koichi Murai, Masatoshi Maruyama, Toyokichi Tange
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Abstract
This invention provides a toner composed of associated particles of secondary particles comprising primary particles of a polymer having an acidic or basic polar group and particles of a coloring agent and optionally a charge controlling agent and a process for producing the toner. Preferably, the contacting portions among the secondary particles are at least partly melt-adhered by film formation. The toner of the invention has excellent advantages. It has a much higher resolution than conventional products. It has excellent chargeability and causes hardly any occurrence of fogging.
Claims20
A toner for developing an electrostatically charged image, composed of associated particles of secondary particles comprising primary particles of a polymer having an acidic or basic polar group and particles of a coloring agent and optionally a charge controlling agent.
A developer for developing an electrostatically charged image comprising
- (1) a toner for developing an electrostatically charged image, composed of associated particles of secondary particles comprising primary particles of a polymer having an acidic or basic polar group and particles of a coloring agent and optionally a charge controlling agent, and
- (2) carrier.
Dependencies are inferred from the claim text.