Abstract: 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 m2/g. (d) is a coupling agent having a NHR1 group and a SSO3H group, or a coupling agent having a NHR1 group and an ene structure (where R1 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).

Abstract: 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 m2/g. (d) is a coupling agent having a NHR1 group and a SSO3H group, or a coupling agent having a NHR1 group and an ene structure (where R1 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).

Abstract: The present disclosure provides a charging member for electrophotographic equipment capable of providing constant and excellent uniform chargeability over a long period of time from low-temperature and low-humidity through high-temperature and high-humidity environments, while suppressing bleeding. A charging member for electrophotographic equipment includes an elastic layer and a surface layer formed around the elastic layer. The elastic layer includes the following (a) through (c): (a) an ion conducting agent that is solid at room temperature; (b) an ion conducting agent that is liquid at room temperature; and (c) an electron conducting agent with an average grain diameter of 25 to 90 nm and a DBP absorption of 152 ml/100 g or below.

Abstract: A conductive roller for electrophotographic device is provided, in which the agglomeration of carbon black to be blended is suppressed and the surface layer of the conductive roller has excellent resistance uniformity when a water-based coating is used. The conductive roller for electrophotographic device 10 including a shaft body 12, an elastic body layer 14 formed on the outer periphery of the shaft body 12, and a surface layer 16 formed on the outer periphery of the elastic body layer 14, and the surface layer 16 is formed from an emulsion composition containing the following (a) to (d): (a) an aqueous polyurethane resin, (b) a urethane curing agent, (c) an associative thickener, and (d) carbon black.

Abstract: A charging member for an electrophotographic apparatus in which image defects caused by bleeding of an ion-conductive agent are suppressed and excellent chargeability can be maintained. In a charging member for an electrophotographic apparatus including a base layer composed of a conductive rubber elastomer and a surface layer, the base layer is a cross-linked body of a conductive rubber composition containing (a) a cross-linkable rubber, (b) a cross-linking agent, (c) an ion-conductive agent represented by a general formula (1) below, and (d) carbon black. Here, R1 and R2 are allyl groups, R3 is a methyl group or an ethyl group, and R4 is a linear alkyl group having a carbon number of 6-8. X? is a sulfonate anion having a fluorine atom or a bis(sulfonyl) imide anion having a fluorine atom.

Abstract: A charging member for an electrophotographic apparatus in which image defects caused by bleeding of an ion-conductive agent are suppressed and excellent chargeability can be maintained. In a charging member for an electrophotographic apparatus including a base layer composed of a conductive rubber elastomer and a surface layer, the base layer is a cross-linked body of a conductive rubber composition containing (a) a cross-linkable rubber, (b) a cross-linking agent, (c) an ion-conductive agent represented by a general formula (1) below, and (d) carbon black. Here, R1 and R2 are allyl groups, R3 is a methyl group or an ethyl group, and R4 is a linear alkyl group having a carbon number of 6-8. X? is a sulfonate anion having a fluorine atom or a bis(sulfonyl) imide anion having a fluorine atom.

Abstract: The present disclosure provides a charging member for electrophotographic equipment capable of providing constant and excellent uniform chargeability over a long period of time from low-temperature and low-humidity through high-temperature and high-humidity environments, while suppressing bleeding. A charging member for electrophotographic equipment includes an elastic layer and a surface layer formed around the elastic layer. The elastic layer includes the following (a) through (c): (a) an ion conducting agent that is solid at room temperature; (b) an ion conducting agent that is liquid at room temperature; and (c) an electron conducting agent with an average grain diameter of 25 to 90 nm and a DBP absorption of 152 ml/100 g or below.

Abstract: The object of the present invention is to provide a conductive roll having high resistance to permanent set and high resistance to adhesion. The conductive roll 1 has a rubber elastic portion formed of a rubber material including a carbon-carbon double bond and exhibiting electric conductivity. The surface of the rubber elastic portion is exposed as the surface of the roll. An organic group including one or more groups selected from silicone groups and fluorine-containing groups is bonded through an isocyanuric acid skeleton to the surface of the rubber elastic portion. The organic group may be a group derived from an organic compound including one or more groups selected from silicone groups and fluorine-containing groups and having a carbon-carbon double bond.

Abstract: The object of the present invention is to provide a conductive roll having high resistance to permanent set and high resistance to adhesion. The conductive roll 1 has a rubber elastic portion formed of a rubber material including a carbon-carbon double bond and exhibiting electric conductivity. The surface of the rubber elastic portion is exposed as the surface of the roll. An organic group including one or more groups selected from silicone groups and fluorine-containing groups is bonded through an isocyanuric acid skeleton to the surface of the rubber elastic portion. The organic group may be a group derived from an organic compound including one or more groups selected from silicone groups and fluorine-containing groups and having a carbon-carbon double bond.

Abstract: A charging roll is provided which does not cause image defects even when being used for a long period of time and does not allow a surface layer to be separated when an electrophotographic machine is operated after the charging roll installed therein is left under high temperature and humidity conditions. A charging roll includes a shaft, an electrically conductive rubber foam layer formed on an outer circumferential surface of the shaft, and a surface layer formed radially outwardly of the electrically conductive rubber foam layer. The electrically conductive rubber foam layer includes a skin layer having an opening area ratio of from 0.5 to 20% at a superficial layer of the electrically conductive rubber foam layer, and the surface layer is formed of a synthetic resin composition mainly composed of a synthetic resin material having a glass transition temperature of from 0 to 45° C.