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:
Apr. 21, 2020
Filed:
Mar. 05, 2018
Kohtaroh Ogino, Shizuoka, JP;
Yoshitaka Yamauchi, Shizuoka, JP;
Akihiro Kaneko, Shizuoka, JP;
Kazumi Suzuki, Shizuoka, JP;
Hisashi Nakajima, Shizuoka, JP;
Kohtaroh Ogino, Shizuoka, JP;
Yoshitaka Yamauchi, Shizuoka, JP;
Akihiro Kaneko, Shizuoka, JP;
Kazumi Suzuki, Shizuoka, JP;
Hisashi Nakajima, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner is provided. The toner includes at least two types of polyester resins and a release agent. When the toner is subjected to a dynamic viscoelasticity measurement at a frequency of 6.28 rad/sec to obtain a temperature-dependent curve of loss tangent (tan δ), and the temperature-dependent curve is differentiated one time with temperature, a resulting curve has a maximum value of 0.07 or more and a minimum value of 0.025 or less within a temperature range of from 85° C. to 110° C. When the toner is subjected to a differential scanning calorimetry (DSC), an endothermic amount measured in a first temperature rising in the DSC is 3.5 J/g or less within a temperature range of from 85° C. to 120° C.