Developing roller, process cartridge, and electrophotographic apparatus
US8660472B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2012 |
| Grant date | Feb 25, 2014 |
| Priority date | — |
| Expiry date | Apr 16, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0818
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a developing roller in which: even when the roller is stored under a high-temperature, high-humidity environment over a long period of time, bleeding is suppressed; and the fusion of toner to its surface upon repeated output of images under low temperature and low humidity is suppressed. The developing roller includes: a mandrel; an elastic layer on an outer periphery of the mandrel; and a surface layer on an outer periphery of the elastic layer, in which: the surface layer contains carbon black and a polyester-polyurethane resin containing a specific structure; and the surface layer has a storage modulus E′ as measured at a temperature of 0° C. and a frequency of 10 Hz of 5 MPa or more and 20 MPa or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.