Electrophotographic photoreceptor, method of producing electrophotographic photoreceptor, and apparatus of forming electrophotographic image

Patent metadata

Field	Value
Publication number	US-10073365-B2
Application number	US-201715635949-A
Country	US
Kind code	B2
Filing date	Jun 28, 2017
Priority date	Jul 22, 2016
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

Provided is an electrophotographic photoreceptor including a conductive support, a photosensitive layer, and a surface protective layer disposed in sequence. The surface protective layer includes a cured product of a composition containing a polymerizable compound, a charge transporting material, and at least two polymerization initiators. The polymerization initiators include an acyl phosphine oxide and an O-acyl oxime.

First claim

What is claimed is:

1. An electrophotographic photoreceptor comprising a conductive support, a photosensitive layer, and a surface protective layer disposed in sequence, wherein
the surface protective layer comprises a cured product of a composition containing a polymerizable compound, a charge transporting material, and at least two polymerization initiators,
the charge transporting material exhibits a maximum absorption wavelength of 405±50 nm in an absorption spectrum,
the polymerization initiators comprise an acyl phosphine oxide and an O-acyl oxime,
when amounts of the acyl phosphine oxide and the O-acyl oxime are respectively expressed as A and B, a weight ratio A:B is within a range of 3:7 to 8:2, and
the O-acyl oxime has a structure represented by Formula (1) or is a compound B-40:

where R 1 and R 2 each represent a moiety selected from the group consisting of a hydrogen atom, an alkyl group having one to six carbon atoms and optionally having a substituent, a cycloalkyl group having three to six carbon atoms and optionally having a substituent, and an aryl group optionally having a substituent; and R 3 represents a moiety selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a nitro group, a hydroxy group, an alkyl group having one to six carbon atoms and optionally having a substituent, an alkoxy group having one to six carbon atoms and optionally having a substituent, an aryl group optionally having a substituent, and a carbonyl group optionally having a substituent;

2. The electrophotographic photoreceptor according to claim 1 , wherein the O-acyl oxime has the structure represented by the Formula (1).

3. The electrophotographic photoreceptor according to claim 1 , wherein the surface protective layer contains metal oxide particles.

4. The electrophotographic photoreceptor according to claim 3 , wherein the metal oxide particles have a reactive organic group.

5. A method of producing an electrophotographic photoreceptor comprising a conductive support, a photosensitive layer, and a surface protective layer disposed in sequence, the method comprising forming the surface protective layer by curing a composition containing a polymerizable compound, a charge transporting material, and at least two polymerization initiators, wherein the polymerization initiators comprise an acyl phosphine oxide and an O-acyl oxime,
wherein, the charge transporting material exhibits a maximum absorption wavelength of 405±50 nm in an absorption spectrum,
when amounts of the acyl phosphine oxide and the O-acyl oxime are respectively expressed as A and B, a weight ratio A:B is within a range of 3:7 to 8:2, and
the O-acyl oxime has a structure represented by Formula (1) or is a compound B-40:

where R 1 and R 2 each represent a moiety selected from the group consisting of a hydrogen atom, an alkyl group having one to six carbon atoms and optionally having a substituent, a cycloalkyl group having three to six carbon atoms and optionally having a substituent, and an aryl group optionally having a substituent; and R 3 represents a moiety selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a nitro group, a hydroxy group, an alkyl group having one to six carbon atoms and optionally having a substituent, an alkoxy group having one to six carbon atoms and optionally having a substituent, an aryl group optionally having a substituent, and a carbonyl group optionally having a substituent;

6. The method of producing an electrophotographic photoreceptor according to claim 5 , wherein the O-acyl oxime has the structure represented by the Formula (1).

7. The method of producing an electrophotographic photoreceptor according to claim 5 , wherein the surface protective layer contains metal oxide particles.

8. The method of producing an electrophotographic photoreceptor according to claim 7 , wherein the metal oxide particles have a reactive organic group.

9. An apparatus of forming an electrophotographic image, the apparatus comprising an electrophotographic photoreceptor, a charging unit to charge the electrophotographic photoreceptor, an exposing unit, a developing unit, and a transferring unit, wherein
the electrophotographic photoreceptor is the electrophotographic photoreceptor according to claim 1 ,
the charging unit is a contact or contactless roller,
the exposing unit includes a light emitting device arrayed in an axial direction of the photoreceptor and an imaging element, or includes a laser optical system,
the developing unit is composed of a developing sleeve that includes a built-in magnet and rotates while retaining a developer, and a voltage-applying device that applies a voltage between the developing sleeve and the photoreceptor, and
the transferring unit includes an endless intermediate transferring belt wound around and rotatably supported by multiple rollers.

Assignees

• Konica Minolta Inc

Inventors

• Ueda Mari
• Fujita Toshiyuki
• Horiguchi Haruo

Classifications

• G03G5/0696

  Phthalocyanines · CPC title

• G03G5/0525

  Coating methods · CPC title

• G03G5/0546

  Polymers comprising at least one carboxyl radical, e.g. polyacrylic acid, polycrotonic acid, polymaleic acid; Derivatives thereof, e.g. their esters, salts, anhydrides, nitriles, amides · CPC title

• G03G5/14734

  Polymers comprising at least one carboxyl radical, e.g. polyacrylic acid, polycrotonic acid, polymaleic acid; Derivatives thereof, e.g. their esters, salts, anhydrides, nitriles, amides · CPC title

• G03G15/75

  Details relating to xerographic drum, band or plate, e.g. replacing, testing (electrographic recording members per se G03G5/00) · CPC title