The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 01, 2013
Filed:
Sep. 02, 2009
Shinya Nakayama, Shizuoka, JP;
Hisashi Nakajima, Shizuoka, JP;
Saori Yamada, Shizuoka, JP;
Mitsuo Aoki, Shizuoka, JP;
Hyo Shu, Shizuoka, JP;
Hiroyuki Kishida, Shizuoka, JP;
Shinya Nakayama, Shizuoka, JP;
Hisashi Nakajima, Shizuoka, JP;
Saori Yamada, Shizuoka, JP;
Mitsuo Aoki, Shizuoka, JP;
Hyo Shu, Shizuoka, JP;
Hiroyuki Kishida, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
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.