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:
Dec. 26, 2017
Filed:
Nov. 27, 2013
Keiji Makabe, Shizuoka, JP;
Tsuyoshi Sugimoto, Shizuoka, JP;
Akinori Saito, Shizuoka, JP;
Suzuka Amemori, Shizuoka, JP;
Toyoshi Sawada, Kanagawa, JP;
Hiroshi Yamashita, Shizuoka, JP;
Shinya Nakayama, Shizuoka, JP;
Atsushi Yamamoto, Osaka, JP;
Daisuke Asahina, Shizuoka, JP;
Satoyuki Sekiguchi, Shizuoka, JP;
Keiji Makabe, Shizuoka, JP;
Tsuyoshi Sugimoto, Shizuoka, JP;
Akinori Saito, Shizuoka, JP;
Suzuka Amemori, Shizuoka, JP;
Toyoshi Sawada, Kanagawa, JP;
Hiroshi Yamashita, Shizuoka, JP;
Shinya Nakayama, Shizuoka, JP;
Atsushi Yamamoto, Osaka, JP;
Daisuke Asahina, Shizuoka, JP;
Satoyuki Sekiguchi, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner includes a binder resin including a copolymer resin containing structural units derived from crystalline and non-crystalline resins, respectively. Spin-spin relaxation time (t50) of the toner at 50° C. measured by pulse NMR is ≦0.05 msec., spin-spin relaxation time (t130) at 130° C. when warmed from 50° C. to 130° C. is >15 msec., and spin-spin relaxation time (t'70) at 70° C. when cooled from 130° C. to 70° C. is ≦1.00 msec. A binarized image obtained by binarizing a phase image of the toner observed by a tapping mode AFM based on intermediate value between maximum and minimum phase difference values in the phase image includes first phase difference images constituted by large phase-difference portions and a second phase difference image constituted by a small phase-difference portion. The first phase difference images are dispersed in the second phase difference image. The dispersion diameter of the first phase difference images is 150 nm or less.