US 8,026,031 B2Granted

Toner, vessel with the toner, developer, image forming apparatus and process cartridge and image forming method

AssigneeRicoh Company, Ltd.

InventorsNaohiro Watanabe, Shigeru Emoto, Yohichiroh Watanabe, Masahide Yamada, Tsunemi Sugiyama, Masahiro Ohki, Akinori Saitoh, Ryota Inoue, Osamu Uchinokura, Junichi Awamura

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Abstract

Toner and a developer which are excellent in cleaning property and fixing property at low temperature, and capable of forming images with high quality are provided. A toner prepared by dispersing and/or emulsifying an oil phase or a monomer phase comprising a toner composition and/or a toner composition precursor in a water-based medium to granulate, wherein the toner has an average circularity of 0.925 to 0.970, and the toner composition and/or the toner composition precursor has a layered inorganic material in which at least a part of interlayer ions in the layered inorganic material has been exchanged with organic ions.

Claims20

Dependent claims

A toner comprising

an oil phase which contains in an organic solvent at least a binding resin and/or a binding resin precursor, a colorant, and an exchanged layered inorganic material wherein at least a part of interlayer ions in the layered inorganic material has been exchanged with organic ions,
wherein the toner is granulated by dispersing and/or emulsifying the oil phase in a water-based medium and then removing the solvent, and
wherein the toner has an average circularity of 0.927 to 0.958,
wherein the toner has a volume average particle diameter (Dv) of 4.6 μm to 5.9 μm, and
wherein a ratio (Dv/Dn) of the volume average particle diameter (Dv) to a number average particle diameter (Dn) of the toner is 1.04 to 1.13.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/282,075Filed 5 Mar 2007
Priority: JP 2006-0588256 Mar 2006
Published: US 2009/0155709 A118 Jun 2009
Granted: 27 Sep 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G03G 9/0827
With toner particles: characterised by their shape, e.g. degree of sphericity
G03G 9/0806
Whereby the components are brought together in a liquid dispersing medium: whereby chemical synthesis of at least one of the toner components…
G03G 9/08755
Comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polyesters
G03G 9/08793
Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775: crosslinked polymers