Electrostatic charging member, electrostatic charging device, process cartridge and image forming apparatus
View Patent ↗An electrostatic charging member includes a base material; and an outermost layer that contains a porous filler and a resin and has a gel fraction of at least about 50% and a surface roughness Rz in a range of about 2 μm to about 20 μm.
1. An electrostatic charging member comprising:
a base material; and
an outermost layer that contains a porous filler and a resin and has a gel fraction of at least about 50% and a surface roughness Rz in a range of about 2 μm to about 20 μm,
wherein the porous filler is a polyamide resin.
2. The electrostatic charging member as described in claim 1 , wherein
the outermost layer contains a polyamide resin as a prime component and further contains at least one selected from the group consisting of a polyvinyl acetal resin, a polyester resin, a phenol resin, an epoxy resin, a melamine resin and a benzoguanamine resin.
3. The electrostatic charging member as described in claim 2 , wherein
the polyamide resin is an alcohol-soluble polyamide resin.
4. The electrostatic charging member as described in claim 3 , wherein
the alcohol-soluble polyamide resin is an N-alkoxymethylated nylon.
5. The electrostatic charging member as described in claim 4 , wherein
the N-alkoxymethylated nylon is an N-methoxymethylated nylon.
6. The electrostatic charging member as described in claim 1 , wherein
the outermost layer is a layer formed by crosslinking reaction using a thermally-latent acid catalyst.
7. An electrostatic charging device comprising:
an electrostatic charging member that comprises:
a base material, and
an outermost layer that contains a porous filler and a resin and has a gel fraction of at least about 50% and a surface roughness Rz in a range of about 2 μm to about 20 μm,
wherein the porous filler is a polyamide resin.
8. The electrostatic charging device as described in claim 7 , further comprising:
a cleaning member that cleans a surface of the electrostatic charging member.
9. The electrostatic charging device as described in claim 8 , wherein
the cleaning member comprises an elastic layer containing a foam material.
10. A process cartridge comprising:
an image holding member; and
an electrostatic charging member that electrostatically charges the image holding member, and comprises:
a base material, and
an outermost layer that contains a porous filler and a resin and has a gel fraction of at least about 50% and a surface roughness Rz in a range of about 2 μm to about 20 μm,
wherein the porous filler is a polyamide resin.
11. The process cartridge as described in claim 10 , further comprising:
a cleaning member that cleans a surface of the electrostatic charging member.
12. The process cartridge as described in claim 11 , wherein
the cleaning member comprises an elastic layer containing a foam material.
13. An image forming apparatus comprising:
an image holding member;
an electrostatic charging member that electrostatically charges the image holding member, and comprises:
a base material, and
an outermost layer that contains a porous filler and a resin and has a gel fraction of at least about 50% and a surface roughness Rz in a range of about 2 μm to about 20 μm;
a latent-image forming unit that forms a latent image on a surface of the image holding member; and
a developing unit that develops the latent image formed on the surface of the image holding member with a toner to form a toner image,
wherein the porous filler is a polyamide resin.
14. The image forming apparatus as described in claim 13 , further comprising:
a cleaning member that cleans a surface of the electrostatic charging member.
15. The image forming apparatus as described in claim 14 , wherein
the cleaning member comprises an elastic layer containing a foam material.