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:
Jun. 04, 2019
Filed:
Nov. 26, 2015
Natsuko Matsushita, Shizuoka, JP;
Tomomi Suzuki, Shizuoka, JP;
Kohtaroh Ogino, Shizuoka, JP;
Tohru Moriya, Shizuoka, JP;
Natsuko Matsushita, Shizuoka, JP;
Tomomi Suzuki, Shizuoka, JP;
Kohtaroh Ogino, Shizuoka, JP;
Tohru Moriya, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
Provided is a toner including at least a binder resin, and having peak ratio W/R of from 0.20 to 0.70 when measured with FT-IR according to ATR method, W/R being a ratio of height W of maximum spectral peak attributed to bisphenol A skeleton of the toner and observed at from 1,480 cmto 1,520 cmto height R of maximum spectral peak attributed to carbonyl group of the toner and observed at from 1,700 cmto 1,750 cm, wherein molecular weight distribution of the toner obtained by GPC of THF-soluble component of the toner has main peak in a range of from 1,000 to 10,000, half value width of the molecular weight distribution is a molecular weight of 20,000 or less, and content of a THF-insoluble component in the toner is from 5% by mass to 40% by mass.