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US 5,288,579 AGranted
Developer for developing electrostatic image, image forming apparatus, apparatus unit and facsimile apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKatsuhiko Tanaka, Kazuyoshi Hagiwara, Tsuyoshi Takiguchi, Rika Doi
Life of this patent
Estimating the term…
Abstract
A developer for developing electrostatic images is constituted by toner containing a binder resin and a charge controller. The charge controller comprises an arylurea compound which is an arylurea having at least one electron-attracting group or electron-donating group, or a polyarylurea including such an arylurea as a recurring unit. The arylurea compound is substantially colorless and can have stable but different levels of triboelectric chargeability depending on the substituents.
Claims77
A developer for developing electrostatic images, comprising:
- a toner containing a binder resin and a charge controller, said charge controller comprising an arylurea compound which comprises an arylurea having at least one electron-attracting group or electron-donating group, or a polyarylurea including such an arylurea as a recurring unit.
Dependencies are inferred from the claim text.