Electrophotographic photoreceptor, image forming apparatus, and process cartridge

• US 20070054207A1
• Filed: 08/23/2006
• Published: 03/08/2007
• Est. Priority Date: 08/23/2005
• Status: Abandoned Application

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Kimura, Michio
• Application Number:
  US11/508,267
• Publication Number:
  US 20070054207A1
• Time in Patent Office: Days
• US Class Current: 430/58.200
• CPC Class Codes: G03G 5/0517 comprising one or more cyclic groups consisting of carbon-atoms only
• CPC Class Codes: G03G 5/0564 Polycarbonates
• CPC Class Codes: G03G 5/0578 Polycondensates comprising silicon atoms in the main chain
• CPC Class Codes: G03G 5/0592 Macromolecular compounds characterised by their structure or by their chemical properties, e.g. block polymers, reticulated polymers, molecular weight, acidity

Abstract

A photoreceptor is provided including an electroconductive substrate, and a charge transport layer located overlying the electroconductive substrate, wherein the charge transport layer includes a polydialkylsiloxane-containing polycarbonate resin having a specific formula, a charge transport material, and a cyclic ether solvent in an amount of from 20 to 5,000 ppm; and an image forming apparatus and a process cartridge, using the photoreceptor.

Claims

1. A photoreceptor, comprising:

an electroconductive substrate; and

a charge transport layer located overlying the electroconductive substrate,

wherein the charge transport layer comprises;

a polydialkylsiloxane-containing polycarbonate resin having the following formula (I);

wherein R1 and R2 each, independently, represents a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group, wherein R1 and R2 optionally share bond connectivity to form a residue group of a cyclic hydrocarbon having 4 to 10 carbon atoms; and

k represents a number of from 0.5 to 0.95, m represents a number of from 0.05 to 0.4999, and n represents a number of from 0.1 to 0.0001, wherein the sum of k, m and n is 1;

a charge transport material; and

a cyclic ether solvent in an amount of from 20 to 5,000 ppm.

2. The photoreceptor according to claim 1, wherein the charge transport layer further comprises plural hydroquinone oxidation inhibitors in a total amount of from 0.05 to 5% by weight based on the charge transport material.

3. The photoreceptor according to claim 1, wherein the charge transport layer further comprises a phenolic oxidation inhibitor.

4. The photoreceptor according to claim 1, in the form of a seamless belt having a difference in perimeter between both ends in a width direction of from 0.05 to 0.31 mm.

5. An image forming apparatus, comprising:

an image bearing member configured to bear an electrostatic latent image;

a developing device configured to develop the electrostatic latent image with at least three toners to form at least three color toner images; and

an intermediate transfer belt contacting the image bearing member, and configured to bear the three color toner images thereon,

wherein the image bearing member is the photoreceptor according to claim 4.

6. The image forming apparatus according to claim 5, further comprising an applicator arranged to apply a metal salt of stearic acid to the intermediate transfer belt and the image bearing member.

7. A process cartridge, detachably attachable to an image forming apparatus, comprising:

an image bearing member; and

at least one member selected from the group consisting of charging means, developing means, cleaning means, and intermediate transfer medium,

wherein the image bearing member is the photoreceptor according to claim 4.