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:
Jul. 15, 2014
Filed:
May. 12, 2011
Katsuyuki Nonaka, Mishima, JP;
Yasuhiro Hashimoto, Mishima, JP;
Naoya Isono, Suntou-gun, JP;
Akira Sugiyama, Yokohama, JP;
Yuhei Terui, Numazu, JP;
Katsuyuki Nonaka, Mishima, JP;
Yasuhiro Hashimoto, Mishima, JP;
Naoya Isono, Suntou-gun, JP;
Akira Sugiyama, Yokohama, JP;
Yuhei Terui, Numazu, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A toner is provided that exhibits a high long-term image stability even during high-speed printing and that also exhibits an excellent environmental stability. The toner comprises a binder resin, a colorant, and a nonionic surfactant, wherein the nonionic surfactant has an oxyethylene group (EO) and an oxypropylene group (PO) and has a ratio of the number of moles of the oxypropylene group to the number of moles of the oxyethylene group (PO/EO) of at least 0.01 and not more than 5.00; and when A (μg/g) is defined as a nonionic surfactant content on the surface of the toner that can be extracted by methanol from 1 g of the toner and B (m/g) is defined as a theoretical specific surface area determined from a toner particle diameter distribution obtained by a precision particle diameter distribution analyzer that operates based on an aperture electrical resistance method, a ratio A/B is at least 100 μg/mand not more than 9000 μg/m.