Developing apparatus, apparatus unit, and image forming method

A developing apparatus comprising;

• a developer container for holding a developer;
• a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone;
• and
• a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member;
• wherein said developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate;
• said resin composition containing at least (i) a urethane resin, (ii) a conductive material and (iii) a quaternary ammonium salt compound which is positively chargeable to iron powder.

An apparatus unit detachably mountable on the main assembly of an image forming apparatus, comprising:

• a developer container for holding a developer;
• a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone;
• and
• a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member;
• wherein said developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate;
• said resin composition containing at least (i) a phenol resin, (ii) a conductive material and (iii) a quaternary ammonium salt compound which is positively chargeable to iron powder.

An apparatus unit detachably mountable on the main assembly of an image forming apparatus, comprising;

• a developer container for holding a developer;
• a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone;
• and
• a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member;
• wherein said developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate;
• said resin composition containing at least (i) a urethane resin, (ii) a conductive material and (iii) a quaternary ammonium salt compound which is positively chargeable to iron powder.

An image forming method comprising the steps of:

• a latent image forming step of forming an electrostatic latent image on a latent image bearing member;
• and
• a developing step of developing the electrostatic latent image by the use of a positively chargeable developer of a developing apparatus;
• wherein, in said developing step, the electrostatic latent image is developed by means of said developing apparatus, which comprises;
• a developer container for holding a developer;
• a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone;
• wherein said developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate;
• said resin composition containing at least (i) a phenol resin, (ii) a conductive material and (iii) a quaternary ammonium salt compound which is positively chargeable to iron powder;
• and
• a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member;
• said positively chargeable developer being triboelectrically charged by its friction with the surface of said developer carrying member so that positive triboelectric charges are imparted to said positively chargeable developer, and the electrostatic latent image being developed by the use of the positively chargeable developer to which the positive triboelectric charges have been imparted.

An image forming method comprising the steps of;

• a latent image forming step of forming an electrostatic latent image on a latent image bearing member;
• and
• a developing step of developing the electrostatic latent image by the use of a positively chargeable developer of a developing apparatus;
• wherein, in said developing step, the electrostatic latent image is developed by means of said developing apparatus, which comprises;
• a developer container for holding a developer;
• a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone;
• wherein said developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate;
• said resin composition containing at least (i) a urethane resin, (ii) a conductive material and (iii) a quaternary ammonium salt compound which is positively chargeable to iron powder;
• and
• a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member;
• said positively chargeable developer being triboelectrically charged by its friction with the surface of said developer carrying member so that positive triboelectric charges are imparted to said positively chargeable developer, and the electrostatic latent image being developed by the use of the positively chargeable developer to which the positive triboelectric charges have been imparted.

A developing apparatus comprising:

• a developer container for holding a developer;
• a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone;
• and
• a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member;
• wherein said developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate;
• said resin composition containing at least (i) a polyamide resin, (ii) a conductive material and (iii) a quaternary ammonium salt compound which is positively chargeable to iron powder.

An apparatus unit detachably mountable on the main assembly of an image forming apparatus, comprising:

• a developer container for holding a developer;
• a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone;
• and
• a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member;
• wherein said developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate;
• said resin composition containing at least (i) a polyamide resin, (ii) a conductive material and (iii) a quaternary ammonium salt compound which is positively chargeable to iron powder.

An image forming method comprising the steps of:

• a latent image forming step of forming an electrostatic latent image on a latent image bearing member;
• and
• a developing step of developing the electrostatic latent image by the use of a positively chargeable developer of a developing apparatus;
• wherein, in said developing step, the electrostatic latent image is developed by means of said developing apparatus, which comprises;
• a developer container for holding a developer;
• a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone;
• wherein said developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate;
• said resin composition containing at least (i) a polyamide resin, (ii) a conductive material and (iii) a quaternary ammonium salt compound which is positively chargeable to iron powder;
• and
• a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member;
• said positively chargeable developer being triboelectrically charged by its friction with the surface of said developer carrying member so that positive triboelectric charges are imparted to said positively chargeable developer, and the electrostatic latent image being developed by the use of the positively chargeable developer to which the positive triboelectric charges have been imparted.