Electrophotographic photoconductor and manufacturing method of electrophotographic photoconductor

• US 20070077507A1
• Filed: 09/19/2006
• Published: 04/05/2007
• Est. Priority Date: 09/30/2005
• Status: Abandoned Application

• Current Assignee: Kyocera MITA Corporation (Kyocera Corporation)
• Original Assignee: Kyocera MITA Corporation (Kyocera Corporation)
• Inventors: Inagaki, Yoshio, Maruo, Keiji, Azuma, Jun, Otsubo, Junichiro, Nakai, Norio, Hamasaki, Kazunari, Okawa, Shiho
• Application Number:
  US11/523,370
• Publication Number:
  US 20070077507A1
• Time in Patent Office: Days
• US Class Current: 430/60
• 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 5/142 Inert intermediate layers
• CPC Class Codes: G03G 5/144 comprising inorganic material

Abstract

The present invention provides an electrophotographic photoconductor which can reduce the generation of fogging under a high-temperature and high-moisture condition and can be easily manufactured, and a method of manufacturing such an electrophotographic photoconductor. In an electrophotographic photoconductor which includes a support base body, an intermediate layer and a photoconductor layer and a manufacturing method of such an electrophotographic photoconductor, the intermediate layer contains titanium oxide and a binding resin and a ΔL value of the intermediate layer satisfies a following relationship formula (1) or a ΔA value of the intermediate layer satisfies a following relationship formula (2), that is, −5.0≦ΔL≦0 (1) and ΔA≦0.055 (2), wherein the ΔL value is a value which is obtained by subtracting an L value (a parameter value which is measured by a color-difference meter in accordance with JIS Z 8722) which is measured with respect to a single support base body from the L value which is measured in a state that the intermediate layer is formed on the support base body, and the ΔA value is a value which is obtained by subtracting reflection absorbance (a parameter value which is measured by a color-difference meter) which is measured with respect to a single support base body from the reflection absorbance which is measured in a state that the intermediate layer is formed on the support base body.

Claims

1. An electrophotographic photoconductor comprising a support base body, an intermediate layer and a photoconductor layer, wherein the intermediate layer contains titanium oxide and a binding resin, and a Δ

L value of the intermediate layer satisfies a following relationship formula (1) or a Δ

A value of the intermediate layer satisfies a following relationship formula (2).

−

5.0≦

Δ

L≦

0 

 

(1)
Δ

A≦

0.055 

 

(2)

Δ

L value;

a value which is obtained by subtracting an L value (a parameter value which is measured by a color-difference meter in accordance with JIS Z

     8722) which is measured with respect to a single support base body from the L value which is measured in a state that the intermediate layer is formed on the support base body.

Δ

A value;

a value which is obtained by subtracting reflection absorbance (a parameter value which is measured by a color-difference meter) which is measured with respect to a single support base body from the reflection absorbance which is measured in a state that the intermediate layer is formed on the support base body.

2. The electrophotographic photoconductor according to claim 1, wherein a value (Δ

a value) which is obtained by subtracting a a value (a parameter value which is measured by a color-difference meter in accordance with JIS Z

     8722) of the intermediate layer which is measured with respect to a single support base body from the a value which is measured in a state that the intermediate layer is formed on the support base body is set to a value which falls within a range from −

1.2 to 0.

3. The electrophotographic photoconductor according to claim 1, wherein a value (Δ

b value) which is obtained by subtracting a b value (a parameter value which is measured by a color-difference meter in accordance with JIS Z

     8722) of the intermediate layer which is measured with respect to a single support base body from the b value which is measured in a state that the intermediate layer is formed on the support base body is set to a value which falls within a range from 0 to 10.

4. The electrophotographic photoconductor according to claim 1, wherein an amount of titanium oxide contained in the intermediate layer is set to a value which falls within a range from 150 to 350 parts by weight with respect to 100 parts by weight of the binding resin.

5. The electrophotographic photoconductor according to claim 1, wherein an average primary particle size of titanium oxide contained in the intermediate layer is set to a value which falls within a range from 0.001 to 0.1 μ

m.

6. The electrophotographic photoconductor according to claim 1, wherein titanium oxide contained in the intermediate layer is covered with an organosilicone compound.

7. The electrophotographic photoconductor according to claim 1, wherein an average molecular weight of the binding resin contained in the intermediate layer is set to a value which falls within a range from 1000 to 50000.

8. The electrophotographic photoconductor according to claim 1, wherein a thickness of the intermediate layer is set to a value which falls within a range from 0.1 to 50 μ

m.

9. The electrophotographic photoconductor according to claim 1, wherein the electrophotographic photoconductor is a multi-layer type electrophotographic photoconductor in which an intermediate layer, a charge generating layer and a charge transferring layer are sequentially stacked on a support base body.

10. A manufacturing method of an electrophotographic photoconductor comprising a support base body, an intermediate layer and a photoconductor layer, wherein the manufacturing method of the electrophotographic photoconductor includes a step for manufacturing the coating solution for forming the intermediate layer by dispersing titanium oxide in a binding resin solution containing a binding resin and an organic solvent, and a step for forming the intermediate layer in which a Δ

L value of the intermediate layer satisfies a following relationship formula (1) or a Δ

A value of the intermediate layer satisfies a following relationship formula (2) by using the coating solution for forming the intermediate layer.

−

5.0≦

Δ

L≦

0 

 

(1)
Δ

A≦

0.055 

 

(2)

Δ

L value;

a value which is obtained by subtracting an L value (a parameter value which is measured by a color-difference meter in accordance with JIS Z

     8722) which is measured with respect to a single support base body from the L value which is measured in a state that the intermediate layer is formed on the support base body.

Δ

A value;

a value which is obtained by subtracting reflection absorbance (a parameter value which is measured by a color-difference meter) which is measured with respect to a single support base body from the reflection absorbance which is measured in a state that the intermediate layer is formed on the support base body.