Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, and image forming apparatus

• US 9,964,868 B2
• Filed: 02/10/2017
• Issued: 05/08/2018
• Est. Priority Date: 02/12/2016
• Status: Active Grant

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: Fujii, Akiteru
• Primary Examiner(s): Vajda, Peter L
• Application Number:
  US15/429,558
• Publication Number:
  US 20170235240A1
• Time in Patent Office: 452 Days
• CPC Class Codes: G03G 5/047 characterised by the charge-generation layers or charge transport layers G03G5/0433 and G03G5/0436 take precedence
• CPC Class Codes: G03G 5/051 Organic non-macromolecular compounds
• CPC Class Codes: G03G 5/0517 comprising one or more cyclic groups consisting of carbon-atoms only
• CPC Class Codes: G03G 5/0535 Polyolefins; Polystyrenes; Waxes
• CPC Class Codes: G03G 5/0696 Phthalocyanines

Abstract

The invention relates to a multilayer type electrophotographic photoreceptor comprising: a conductive support; and, on the conductive support, a charge generation layer containing a hydroxygallium phthalocyanine pigment and a charge transport layer,

wherein the content of α-chloronaphthalene in hydroxygallium phthalocyanine pigment in the charge generation layer is in a range of 0 ng/cm² to 0.1 ng/cm², the charge transport layer contains a non-halogen organic solvent having a boiling point of 140° C. or more, and the content of the non-halogen organic solvent having a boiling point of 140° C. or more is in a range of 0.1 μg/cm² to 5 μg/cm².

Claims

1. A multilayer type electrophotographic photoreceptor comprising:

a conductive support; and

on the conductive support, a charge generation layer and a charge transport layer, the charge generation layer comprising a hydroxygallium phthalocyanine pigment,

wherein the content of α

-chloronaphthalene in the hydroxygallium phthalocyanine pigment in the charge generation layer is in a range of 0 ng/cm² to 0.1 ng/cm², the charge transport layer comprises a non-halogen organic solvent having a boiling point of 140°

C. or more, the non-halogen organic solvent comprises o-xylene and methyl benzoate, and the content of the non-halogen organic solvent in the charge transport layer is in a range of 0.1 μ

g/cm² to 5 μ

g/cm².

2. The multilayer type electrophotographic photoreceptor according to claim 1, wherein the non-halogen organic solvent further comprises at least one selected from the group consisting of ethyl benzoate, benzyl acetate, ethyl 3-ethoxypropionate, diethylene glycol ethyl methyl ether, and 4-methoxy-4-methyl-2-pentanone.

3. The multilayer type electrophotographic photoreceptor according to claim 1, wherein the charge generation layer comprises at least one compound selected from an amino compound, an amide compound, and a urea compound.

4. The multilayer type electrophotographic photoreceptor according to claim 1, wherein the charge transport layer further comprises a polyarylate resin.

5. The multilayer type electrophotographic photoreceptor according to claim 1, wherein the hydroxygallium phthalocyanine is hydroxygallium phthalocyanine crystal which represents an intense diffraction peak at Bragg angles (2θ

±

0.2) of 28.3°

in an X-ray diffraction pattern with CuKα

line.

6. An electrophotographic photoreceptor cartridge comprising the electrophotographic photoreceptor according to claim 1.

7. An image forming apparatus comprising:

the electrophotographic photoreceptor according to claim 1;

a charging device;

an exposing device; and

a developer.

8. The multilayer type electrophotographic photoreceptor according to claim 1, wherein the hydroxygallium phthalocyanine pigment in the charge generation layer does not contain α

-chloronaphthalene.

9. The multilayer type electrophotographic photoreceptor according to claim 3, wherein the content of the at least one compound selected from an amino compound, an amide compound, and a urea compound with respect to the amount of the hydroxygallium phthalocyanine pigment is in a range of 0.05 to 20 mass %.

10. The multilayer type electrophotographic photoreceptor according to claim 3, wherein the content of the at least one compound selected from an amino compound, an amide compound, and a urea compound with respect to the amount of the hydroxygallium phthalocyanine pigment is in a range of 0.2 to 10 mass %.

11. The multilayer type electrophotographic photoreceptor according to claim 1, wherein the content of the non-halogen organic solvent in the charge transport layer is in a range of 0.2 μ

g/cm² to 2 μ

g/cm2.