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:
May. 02, 2017
Filed:
Feb. 23, 2016
Tsuyoshi Sugimoto, Shizuoka, JP;
Shinya Nakayama, Shizuoka, JP;
Hiroshi Yamada, Shizuoka, JP;
Hideyuki Santo, Kanagawa, JP;
Shin Hasegawa, Tokyo, JP;
Suzuka Karato, Shizuoka, JP;
Kohsuke Nagata, Shizuoka, JP;
Koh Ohnuma, Shizuoka, JP;
Tsuyoshi Sugimoto, Shizuoka, JP;
Shinya Nakayama, Shizuoka, JP;
Hiroshi Yamada, Shizuoka, JP;
Hideyuki Santo, Kanagawa, JP;
Shin Hasegawa, Tokyo, JP;
Suzuka Karato, Shizuoka, JP;
Kohsuke Nagata, Shizuoka, JP;
Koh Ohnuma, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner includes a polyester resin including a polyester resin component A (A) insoluble in tetrahydrofuran; and a polyester resin component B (B) soluble in tetrahydrofuran. The toner has a first glass transition temperature (Tg1st) of from 20° C. to 50° C., measured at a first temperature rising in differential scanning calorimetry (DSC), and satisfies the following formulae (1) and (2):=1/{/(+273)+/(+273)}−273  (1)>30×  (2)wherein a and b represent weight ratios of (A) and (B) to a total weight of (A) and (B), and satisfy the equation a+b=1; and TgA, TgB and TgAB represent second glass transition temperatures (Tg2nd), measured at a second temperature rising in differential scanning calorimetry, of (A), (B), and a mixture of (A) and (B), respectively.