Invention Grant
- Patent Title: Toner and developer
- Patent Title (中): 墨粉和开发商
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Application No.: US13063701Application Date: 2009-09-02
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Publication No.: US08546055B2Publication Date: 2013-10-01
- Inventor: Shinya Nakayama , Hisashi Nakajima , Saori Yamada , Mitsuo Aoki , Hyo Shu , Hiroyuki Kishida
- Applicant: Shinya Nakayama , Hisashi Nakajima , Saori Yamada , 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: JP2008-234345 20080912
- International Application: PCT/JP2009/065619 WO 20090902
- International Announcement: WO2010/029903 WO 20100318
- Main IPC: G03G9/087
- IPC: G03G9/087

Abstract:
A toner containing at least a binder resin, releasing agent, and colorant, wherein the binder resin contains polyester resin (A), polyester resin (B), and polyester resin (C), which is prepared by condensation-polymerizing (i) an alcohol component containing an alkylene oxide adduct of bisphenol compound and (ii) a carboxylic acid component; at least one of the polyester resin (A) and polyester resin (B) is a polyester resin prepared by condensation-polymerizing (i) the alcohol component substantially composed of only aliphatic alcohol and containing 1,2-propanediol in an amount of 65 mole % or more of a divalent alcohol component and (ii) the carboxylic acid component; and a softening point Tm(A) of the polyester resin (A) is 10 C or more higher than Tm(B) of the polyester resin (B), and the absolute difference between Tm(C) of the polyester resin (C) and the Tm(B) is 5° C. or less.
Public/Granted literature
- US20110165508A1 TONER AND DEVELOPER Public/Granted day:2011-07-07
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