METHOD FOR PRODUCING ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER

• US 20140212807A1
• Filed: 01/21/2014
• Published: 07/31/2014
• Est. Priority Date: 01/28/2013
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Miura, Daisuke, Tanaka, Daisuke, Sugiyama, Kazumichi
• Granted Patent: US 9,304,414 B2
• Time in Patent Office: Days
• US Class Current: 430/133
• 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 5/0514 not comprising cyclic groups
• CPC Class Codes: G03G 5/0517 comprising one or more cyclic groups consisting of carbon-atoms only
• CPC Class Codes: G03G 5/0525 Coating methods
• CPC Class Codes: G03G 5/056 Polyesters
• CPC Class Codes: G03G 5/0564 Polycarbonates

Abstract

A method for producing an electrophotographic photosensitive member having a charge transporting layer, the charge transporting layer being a surface layer, the method including drying a coat of a charge-transporting-layer coating liquid to form the charge transporting layer, wherein the charge-transporting-layer coating liquid contains components (α), (β), (γ) and (δ), and when the solubility of the component (α) in 100 g of the component (γ) is defined as X(g) and the solubility of the component (α) in 100 g of the component (δ) is defined as Y(g), solubility X and solubility Y satisfy a relationship of X>Y.

Claims

1. A method for producing an electrophotographic photosensitive member comprising a support, a charge generating layer formed on the support, and a charge transporting layer formed on the charge generating layer, the method comprising:

forming a coat for the charge transporting layer using a charge-transporting-layer coating liquid, and

drying the coat to form the charge transporting layer, wherein

the charge transporting layer is a surface layer,

the charge-transporting-layer coating liquid comprises;

(α

) a charge transporting substance;

(β

) at least one resin selected from the group consisting of

a polycarbonate resin having a structural unit represented by the following formula (1A), and

a polyester resin having a structural unit represented by the following formula (1B);

(γ

) an aromatic hydrocarbon solvent; and

(δ

) a compound having a boiling point under 1 atmosphere higher than that of the (γ

);

the charge-transporting-layer coating liquid is free of any polyester resins having a siloxane structure at the end thereof and any polycarbonate resins having a siloxane structure at the end thereof; and

the (α

), the (γ

) and the (δ

) satisfy the following expression;

X(g)>

Y(g)

wherein,

X(g) represents the solubility of the (α

) in 100 g of the (γ

) in an environment at 23°

C. under 1 atmosphere, and

Y(g) represents the solubility of the (α

) in 100 g of the (δ

) in an environment at 23°

C. under 1 atmosphere;

2. The method for producing an electrophotographic photosensitive member according to claim 1, wherein the (δ

) is at least one compound selected from the group consisting of hexanol, heptanol, cyclohexanol, benzyl alcohol, ethylene glycol, 1,4-butanediol, 1,5-pentanediol, diethylene glycol, diethylene glycol ethyl methyl ether, cyclohexanone, ethylene carbonate, propylene carbonate, nitrobenzene, N-methylpyrrolidone, methyl benzoate, ethyl benzoate, benzyl acetate, ethyl-3-ethoxypropionate, acetophenone, methyl salicylate, dimethyl phthalate and sulfolane.

3. The method for producing an electrophotographic photosensitive member according to claim 1, wherein the aromatic hydrocarbon solvent is at least one selected from the group consisting of toluene, xylene, ethylbenzene and mesitylene.

4. The method for producing an electrophotographic photosensitive member according to claim 1, wherein the content of the (γ

) is higher than the content of the (δ

) in the charge-transporting-layer coating liquid.

5. The method for producing an electrophotographic photosensitive member according to claim 1, wherein the charge-transporting-layer coating liquid further comprises (ε

) a compound having a boiling point under 1 atmosphere of 35 to 70°

C.

6. The method for producing an electrophotographic photosensitive member according to claim 5, wherein the (ε

) is at least one compound selected from the group consisting of acetone, diethyl ether, methyl acetate, tetrahydrofuran and dimethoxymethane.

7. The method for producing an electrophotographic photosensitive member according to claim 5, wherein the total content of the (γ

) and (δ

) based on the total content of the (γ

), (δ

) and (ε

) in the charge-transporting-layer coating liquid is 50% by mass or more and 90% by mass or less.

8. The method for producing an electrophotographic photosensitive member according to claim 1, wherein the (α

) is at least one selected from the group consisting of a triarylamine compound, a hydrazone compound, a styryl compound, a stilbene compound, a pyrazoline compound, an oxazole compound, a thiazole compound, a triarylmethane compound and an enamine compound.

9. The method for producing an electrophotographic photosensitive member according to claim 8, wherein the (α

) is at least one selected from the group consisting of a compound represented by the following formula (2), a compound represented by the following formula (3) and a compound represented by the following formula (4);

10. The method for producing an electrophotographic photosensitive member according to claim 1, wherein the drying temperature for drying the coat is 100°

C. or higher and 140°

C. or lower.