Conductive roll for electrophotographic machine
Provided is a conductive roll for an electrophotographic machine. The conductive roll is a charging roll and includes a shaft body, and an elastic body layer formed on an outer periphery of the shaft body. The elastic body layer is a crosslinked body of a composition containing a diene-based polymer (a), a sulfur or peroxide crosslinking agent (b), carbon black (c), and a coupling agent (d). (c) has a specific surface area of 40 to 300 m 2 /g. (d) is a coupling agent having a NHR 1 group and a SSO 3 H group, or a coupling agent having a NHR 1 group and an ene structure (where R 1 is H or a hydrocarbon group having 1 to 8 carbon atoms). The contents of (c) and (d) in the composition are respectively 10 to 45 parts by mass and 0.5 to 20 parts by mass with respect to 100 parts by mass of (a).
1. A conductive roll for an electrophotographic machine, the conductive roll being a charging roll and comprising:
a shaft body; and
an elastic body layer formed on an outer periphery of the shaft body, wherein the elastic body layer is a crosslinked body of a composition containing:
a diene-based polymer (a),
a crosslinking agent (b),
a carbon black (c), and
a coupling agent (d), wherein
the crosslinking agent (b) is a sulfur crosslinking agent or a peroxide crosslinking agent;
the carbon black (c) has a specific surface area ranging from 40 m 2 /g to 300 m 2 /g, and a content of the carbon black (c) in the composition ranges from 10 parts by mass to 45 parts by mass with respect to 100 parts by mass of the diene-based polymer (a); and
the coupling agent (d) is (d1) or (d2) below, and a content of the coupling agent (d) in the composition ranges from 0.5 part by mass to 20 parts by mass with respect to 100 parts by mass of the diene-based polymer (a):
(d1) a coupling agent having a NHR 1 group and a SSO 3 H group;
(d2) a coupling agent having a NHR 1 group and an ene structure, wherein
R 1 is H or a hydrocarbon group having 1 to 8 carbon atoms.