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. 14, 2015
Filed:
Mar. 14, 2013
Masashi Nagayama, Shizuoka, JP;
Hisashi Nakajima, Shizuoka, JP;
Saori Yamada, Shizuoka, JP;
Shinya Hanatani, Kanagawa, JP;
Mariko Takii, Kanagawa, JP;
Yoshitaka Sekiguchi, Shizuoka, JP;
Masashi Nagayama, Shizuoka, JP;
Hisashi Nakajima, Shizuoka, JP;
Saori Yamada, Shizuoka, JP;
Shinya Hanatani, Kanagawa, JP;
Mariko Takii, Kanagawa, JP;
Yoshitaka Sekiguchi, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner including a crystalline polyester resin (A), an amorphous resin (B), and a composite resin (C) having a condensation polymerization resin unit and an addition polymerization resin unit is provided. A molecular weight distribution of the toner based on THF-soluble contents thereof has a main peak within a molecular weight range from 1,000 to 10,000 and a half bandwidth of the main peak is 15,000 or less. The molecular weight distribution is determined by gel permeation chromatography. The toner includes chloroform-insoluble contents. A ratio C/R of the toner is within a range from 0.03 to 0.55. C and R represent heights of spectrum peaks specific to the crystalline polyester resin (A) and the amorphous resin (B), respectively, determined by a Fourier transform infrared spectroscopic attenuation total reflection method after the toner is stored in a thermostatic chamber at 45° C. for 12 hours.