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. 04, 2006
Filed:
Sep. 02, 2003
Shigenori Yaguchi, Ibaraki, JP;
Ryuuichi Shimizu, Ibaraki, JP;
Junji Kobayashi, Ibaraki, JP;
Tadahiro Kaneko, Ibaraki, JP;
Nobuyoshi Hoshi, Ibaraki, JP;
Tsuneaki Kawanishi, Ibaraki, JP;
Shigenori Yaguchi, Ibaraki, JP;
Ryuuichi Shimizu, Ibaraki, JP;
Junji Kobayashi, Ibaraki, JP;
Tadahiro Kaneko, Ibaraki, JP;
Nobuyoshi Hoshi, Ibaraki, JP;
Tsuneaki Kawanishi, Ibaraki, JP;
Ricoh Printing Systems, Ltd., Tokyo, JP;
Abstract
An electrophotographic toner containing: a fixing resin, a colorant, and wax. The wax at least contains hydrocarbon wax having a number-average molecular weight of not higher than 600, and polyethylene wax having a number-average molecular weight of not higher than 600, a melting viscosity of lower than 15 mPa·s at 140° C. and a crystallinity of lower than 95%. A ratio of the hydrocarbon wax to the polyethylene wax is in a range of from 1:10 to 2:1. A maximum of absorption peaks in a heat-up time absorption calorie curve in a DSC curve of the toner measured by a differential scanning calorimeter is at a temperature not higher than 75° C. An onset temperature in absorption of heat is not higher than 65° C.