Charging roller
An object of the present invention is to provide a charging roller in which detachment of particles from a surface layer as well as abrasion and scraping of the particles, which are caused by contact and the like with other member such as a photoreceptor during the use, are unlikely to occur. The charging roller includes: a shaft 1 ; and an elastic layer 2 and a surface layer 3 , which are sequentially formed on the outer circumference of the shaft 1 . The surface layer 3 is composed of a mixture of a surface layer resin composition and particles, the surface layer resin composition has a tensile elongation at break of 51% or greater, and the particles have a reaction force of 1.0 to 10.3 mN under 1-μm compression.
1. A charging roller comprising:
a shaft; and
an elastic layer and a surface layer which are sequentially formed on the outer circumference of the shaft,
wherein the surface layer is composed of a mixture of a surface layer resin composition and particles,
the surface layer resin composition has a tensile elongation at break of 51% or greater,
the particles have a reaction force of 1.0 to 10.3 mN under 1-μm compression, and
the surface layer resin composition comprises a urethane resin composed of a polyol having an ester skeleton and an isocyanate having an aromatic ring.
2. The charging roller according to claim 1 , wherein the particles have a glass transition temperature (Tg) of 34° C. or higher.