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:
Jan. 04, 2011
Filed:
Nov. 21, 2007
Shinya Nakayama, Numazu, JP;
Akihiro Kotsugai, Numazu, JP;
Yasuaki Iwamoto, Numazu, JP;
Yasutada Shitara, Numazu, JP;
Yohichiroh Watanabe, Fuji, JP;
Shinya Nakayama, Numazu, JP;
Akihiro Kotsugai, Numazu, JP;
Yasuaki Iwamoto, Numazu, JP;
Yasutada Shitara, Numazu, JP;
Yohichiroh Watanabe, Fuji, JP;
Ricoh Company, Ltd., Tokyo, JP;
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.