Production process of organic photoreceptor

Patent metadata

Field	Value
Publication number	US-9201320-B2
Application number	US-201414294735-A
Country	US
Kind code	B2
Filing date	Jun 3, 2014
Priority date	Jun 19, 2013
Publication date	Dec 1, 2015
Grant date	Dec 1, 2015

Abstract

Disclosed is a production process of an organic photoreceptor which can suppress occurrence of uneven density and image defects. The production process of an organic photoreceptor, the organic photoreceptor including an intermediate layer and an organic photosensitive layer on the intermediate layer, includes: applying a coating liquid for forming the intermediate layer to a conductive support to form a coating film, the coating liquid being obtained by dissolving a binder resin in a solvent and dispersing first and second metal oxide fine particles therein; and drying the coating film. The Pe number of the first metal oxide fine particles is two or more times larger than that of the second metal oxide fine particles.

Pe number=(6πμ EHR )/ kT   Equation (1):

First claim

The invention claimed is:

1. A production process of an organic photoreceptor, the organic photoreceptor including a conductive support, an intermediate layer formed on the conductive support, and an organic photosensitive layer stacked on the intermediate layer, the process comprising:
applying a coating liquid for forming the intermediate layer to the conductive support to form a coating film, the coating liquid being obtained by dissolving a binder resin in a solvent and dispersing first metal oxide fine particles and second metal oxide fine particles therein; and
drying the coating film,
wherein a Pe number of the first metal oxide fine particles is two or more times larger than that of the second metal oxide fine particles when the Pe number defined by a following Equation (1) is measured for following Pe number evaluation liquids under following measurement conditions using the first and second metal oxide fine particles,
Pe number=(6πμ EHR )/ kT   Equation (1):

[in the Equation (1), μ represents a viscosity (Pa·s) of Pe number evaluation liquid 2, E represents a liquid film contraction rate (m/s) when a wet film of Pe number evaluation liquid 1 is formed, H represents a wet film thickness of Pe number evaluation liquid 1, R represents a number average primary particle size (m) of the metal oxide fine particles, k represents Boltzmann constant (J/K), and T represents a liquid temperature (K)],

Measurement Conditions:
Pe number evaluation liquid 1: obtained by dissolving 100 parts by mass of a binder resin in 1700 parts by mass of a solvent and dispersing 260 parts by mass of the first or second metal oxide fine particles in the solvent, wherein the binder resin and the solvent are the same as those used in the coating liquid for forming the intermediate layer;
Pe number evaluation liquid 2: obtained by dissolving 100 parts by mass of a binder resin in 850 parts by mass of a solvent and dispersing 260 parts by mass of the first or second metal oxide fine particles in the solvent, wherein the binder resin and the solvent are the same as those used in the coating liquid for forming the intermediate layer;
Liquid temperature: 296 K; and
Wet film thickness: 32×10 −6 m.

2. The production process of an organic photoreceptor according to claim 1 , wherein the Pe number of the first metal oxide fine particles is not less than 200.

3. The production process of an organic photoreceptor according to claim 1 , wherein the first metal oxide fine particles and the second metal oxide fine particles are each made of either one of titanium oxide and zinc oxide.

4. The production process of an organic photoreceptor according to claim 3 , wherein the first metal oxide fine particles and the second metal oxide fine particles are each made of titanium oxide.

5. The production process of an organic photoreceptor according to claim 4 , wherein the first metal oxide fine particles and the second metal oxide fine particles are each made of rutile type titanium oxide.

6. The production process of an organic photoreceptor according to claim 1 , wherein the organic photosensitive layer contains as a charge generating material any one of a Y-form titanyl phthalocyanine pigment and a mixture of a titanyl phthalocyanine pigment and a pigment of an adduct of titanyl phthalocyanine and 2,3-butanediol.

7. The production process of an organic photoreceptor according to claim 1 , wherein a number average primary particle size of the first metal oxide fine particles and a number average primary particle size of the second metal oxide fine particles are each 5 to 100 nm.

8. The production process of an organic photoreceptor according to claim 7 , wherein the number average primary particle size of the first metal oxide fine particles and the number average primary particle size of the second metal oxide fine particles are each 10 to 40 nm.

9. The production process of an organic photoreceptor according to claim 1 , wherein a thickness of the intermediate layer is 0.5 to 25 μm.

10. The production process of an organic photoreceptor according to claim 9 , wherein the thickness of the intermediate layer is 1 to 7 μm.

Assignees

• Konica Minolta Inc

Inventors

• Nakahara Hiroshi
• Hamaguchi Shinichi
• Sakimura Tomoo
• Matsusaki Mayuko

Classifications

• G03G5/144 Primary

  comprising inorganic material · CPC title