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:
Sep. 20, 2011
Filed:
Mar. 19, 2008
Masayuki Hagi, Minoh, JP;
Yoshihiro Mikuriya, Nishinomiya, JP;
Hideaki Yasunaga, Ibaraki, JP;
Hiroaki Katoh, Nagaokakyo, JP;
Kazuoki Fuwa, Toyonaka, JP;
Yoshitaka Sekiguchi, Nishinomiya, JP;
Satoshi Ogawa, Nara, JP;
Masahide Inoue, Numazu, JP;
Masayuki Hagi, Minoh, JP;
Yoshihiro Mikuriya, Nishinomiya, JP;
Hideaki Yasunaga, Ibaraki, JP;
Hiroaki Katoh, Nagaokakyo, JP;
Kazuoki Fuwa, Toyonaka, JP;
Yoshitaka Sekiguchi, Nishinomiya, JP;
Satoshi Ogawa, Nara, JP;
Masahide Inoue, Numazu, JP;
Ricoh Company Limited, Tokyo, JP;
Abstract
A toner useful for an oilless fixing method, includes a binder resin; a colorant; and 2.0 to 4.5% by weight of a wax which is soluble in n-hexane, based on a total weight of the toner, wherein the wax is dispersed in the toner, the wax forming wax domain particles (DA) comprising wax domain particles (DS) exposed at a surface of the toner and wax domain particles (DI) encapsulated in the toner and not exposed at the surface of the toner, wherein a weight of the DS is greater than a weight of the DI, wherein the toner from which the DS have been eluted with n-hexane comprises vestigial concavities having an area of 0.01 πμmor more on the surface of the toner in an amount of from 1 to 7 pcs/4 μm, and wherein 60% or more by number of the DA having a particle diameter of 200 nm or more have a spindle or cylindrical shape having an aspect ratio of 4 or more.