Invention Grant
- Patent Title: Toner and developer
- Patent Title (中): 墨粉和开发商
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Application No.: US12624714Application Date: 2009-11-24
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Publication No.: US08703376B2Publication Date: 2014-04-22
- Inventor: Saori Yamada , Shinya Nakayama , Hisashi Nakajima , Mitsuo Aoki , Hyo Shu , Hiroyuki Kishida
- Applicant: Saori Yamada , Shinya Nakayama , Hisashi Nakajima , Mitsuo Aoki , Hyo Shu , Hiroyuki Kishida
- 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: JP2008-304797 20081128; JP2009-005823 20090114
- Main IPC: G03G9/087
- IPC: G03G9/087 ; G03G13/20

Abstract:
A toner, wherein a binder resin contains a polyester resin (A) produced by polycondensing an alcohol component with a carboxylic acid component which contains a rosin compound in an amount of 5% by mass or more of the total amount by mass of the alcohol component and the carboxylic acid component, and a polyester resin (B) produced by polycondensing an alcohol component containing an alkylene oxide adduct of bisphenol A represented by General Formula (1) given below with a carboxylic acid component, and wherein the toner contains abietic acid in an amount of 0.01% by mass to 1% by mass: where R1 and R2 each represent C2-C4 alkylene; R3 and R4 are each any one of a hydrogen atom, C1-C6 straight-chain alkyl, and C1-C6 branched-chain alkyl; and x and y each represent a positive integer and the sum of x and y is 1 to 16.
Public/Granted literature
- US20100136471A1 TONER AND DEVELOPER Public/Granted day:2010-06-03
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