ROLLER FOR ELECTROPHOTOGRAPHY AND PRODUCTION METHOD THEREOF, AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS

摘要

A roller for electrophotography that has a low electric resistance value and that is still further reduced in contaminating property of other member is provided. The roller includes an electro-conductive mandrel and a surface layer having an electro-conductive foam. The electro-conductive foam includes a vulcanized product of an unvulcanized rubber composition including an acrylonitrile-butadiene rubber and a hydrin rubber. The vulcanized product has a matrix-domain structure having a sea phase and an island phase, contains ethylene oxide of 8.0% by mass or more and 20.0% by mass or less based on a total amount of the vulcanized product, and has a spin-spin relaxation time T2 of 750 μs

主权项

1. A roller for electrophotography comprising:
an electro-conductive mandrel; and a surface layer having an electro-conductive foam, wherein
the electro-conductive foam comprises a vulcanized product of an unvulcanized rubber composition comprising an acrylonitrile-butadiene rubber and a hydrin rubber,the hydrin rubber comprises an epichlorohydrin/ethylene oxide/allyl glycidyl ether terpolymer,the vulcanized product has a matrix-domain structure comprising a sea phase and an island phase, the sea phase containing a vulcanized acrylonitrile-butadiene rubber, and the island phase containing a vulcanized hydrin rubber,the vulcanized product contains ethylene oxide of 8.0% by mass or more and 20.0% by mass or less based on a total amount of the vulcanized product, andthe vulcanized product has a spin-spin relaxation time T2, determined by pulse NMR measurement with a hydrogen nucleus as a measurement nucleus, of: 750 μs