Invention Grant
- Patent Title: Toner, image forming apparatus using the same, image forming method using the same, and process cartridge
- Patent Title (中): 调色剂,使用其的成像装置,使用其的成像方法和处理盒
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Application No.: US11943929Application Date: 2007-11-21
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Publication No.: US08007974B2Publication Date: 2011-08-30
- Inventor: Shinya Nakayama , Akihiro Kotsugai , Yasuaki Iwamoto , Yasutada Shitara
- Applicant: Shinya Nakayama , Akihiro Kotsugai , Yasuaki Iwamoto , Yasutada Shitara
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2006-315650 20061122
- Main IPC: G03G9/097
- IPC: G03G9/097

Abstract:
A toner that is excellent in low-temperature fixing property, offset resistance, storage stability, charge rising property, charge stability with time and pulverizability and allows for forming high-quality images over a long period of time. The toner contains at least a binder resin, a colorant and a charge controlling agent, wherein the charge controlling agent contains an aromatic oxycarboxylic acid metal compound having a trivalent or more central metal, the binder resin comprises a polyester resin (A) having a softening point Tm (A) of 120° C. to 160° C. and a polyester resin (B) having a softening point Tm (B) of 80° C. to less than 120° C., and at least any one of the polyester resins (A) and (B) contains 1,2-propane diol at 65 mol % or more in a divalent alcohol component and can be obtained by condensation polymerizing an alcohol component substantially composed of only an aliphatic alcohol with a carboxylic acid component.
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