Invention Grant
US07862973B2 Toner and developer, and image forming apparatus, image forming method and process cartridge
有权
调色剂和显影剂,以及成像设备,成像方法和处理盒
- Patent Title: Toner and developer, and image forming apparatus, image forming method and process cartridge
- Patent Title (中): 调色剂和显影剂,以及成像设备,成像方法和处理盒
-
Application No.: US11943972Application Date: 2007-11-21
-
Publication No.: US07862973B2Publication Date: 2011-01-04
- Inventor: Shinya Nakayama , Akihiro Kotsugai , Yasuaki Iwamoto , Yasutada Shitara , Yohichiroh Watanabe
- Applicant: Shinya Nakayama , Akihiro Kotsugai , Yasuaki Iwamoto , Yasutada Shitara , Yohichiroh Watanabe
- 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: JP2006-315674 20061122; JP2006-316353 20061122
- Main IPC: G03G9/00
- IPC: G03G9/00

Abstract:
Provided is a toner that comprises a binder resin, a releasing agent, and a colorant, wherein the mass average particle diameter of the toner is 3 μm to 8 μm, the content of particles having a particle diameter of no more than 5 μm is from 60% by number to 90% by number, the binder resin comprises a polyester resin (A) having a softening temperature Tm(A) from no lower than 120° C. to no higher than 160° C. and a polyester resin (B) having a softening temperature Tm(B) from no lower than 80° C. to lower than 120° C., and at least one of the polyester resins (A) and (B) is prepared by condensation polymerization between an alcohol component and a carboxylic acid component, and the alcohol component comprises divalent alcohol of 1,2-propanediol in a content of no less than 65% by mole and consists substantially of aliphatic alcohol; and also provided is a developer that comprises the toner and a carrier.
Public/Granted literature
- US20080118855A1 TONER AND DEVELOPER, AND IMAGE FORMING APPARATUS, IMAGE FORMING METHOD AND PROCESS CARTRIDGE Public/Granted day:2008-05-22
Information query