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:
Mar. 09, 2021
Filed:
Jun. 19, 2020
Sumitomo Riko Company Limited, Aichi, JP;
Sumitomo Riko Company Limited, Aichi, JP;
Abstract
An electrophotography device development roller in which an increase in the electric charge of a toner is suppressed is provided. This electrophotography device development rolleris provided with a shaft, an elastic layerformed on the outer circumference of the shaft, and a surface layerformed on the outer circumference of the elastic layer. The surface layercontains components (a) to (c) below. Component (a) a binder comprising acrylonitrile-butadiene rubber having an acrylonitrile amount of 30 mass % or more; component (b) an ion-conducting agent comprising at least one selected from a phosphonium salt and a pyridinium salt; and component (c) an electric charge regulator comprising an acrylic polymer having a silicone group or fluorine-containing group and a cationic group.