US 7,115,346 B2Granted

Multi-layered electrophotographic positively charged organic photoconductor and manufacturing method thereof

AssigneeSamsung Electronics Co., Ltd.

InventorsSaburo Yokota, Kyung-yol Yon, Hwan-koo Lee, Hae-ree Joo, Boem-jun Kim, Nam-jeong Lee

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Abstract

A multi-layered electrophotographic positively charged organic photoconductor includes a conductive substrate, a charge transport layer formed on the conductive substrate, and a charge generating layer formed on the charge transport layer. A composition to form the charge transport layer includes at least one hole transport material, a binder resin and an organic solvent, and a composition to form the charge generating layer includes a charge generating material, a binder resin, an organic solvent and a hole transport material. An organic photoconductor has improved static electrical properties by controlling interfacial conditions of the charge transport layer and the charge generating layer. The charge generating layer may be readily coated on the charge transport layer. In addition, the organic photoconductor has excellent electric properties such as an improved sensitivity and a low discharge voltage.

Claims11

Dependent claims

A multi-layered electrophotographic positively charged organic photoconductor comprising:

a conductive substrate;
a charge transport layer on the conductive substrate;
and
a charge generating layer on the charge transport layer,
in which a first composition to form the charge transport layer comprises:
at least one hole transport material;
a binder resin;
and
an organic solvent, and
a second composition to form the charge generating layer comprises:
a charge generating material;
a binder resin;
an organic solvent;
and
a hole transport material,
wherein the hole transport material in the composition to form the charge transport layer comprises a mixture of the following compounds:
a stilbene compound having a structure of the following formula (I):
in which, R1 and R2 are independently selected from the group consisting of a hydrogen atom, an alkyl group, an aryl group, and a styryl group, provided that at least one of R1 and R2 is selected from an aryl group and styryl group;
R3 is selected from the group consisting of a substituted or unsubstituted alkyl group, an aralkyl group and an aryl group;
R4 and R5 independently selected from the group consisting of a hydrogen atom and an alkyl group;
and
R6 is selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group and an alkoxy group;
and
a hydrazone compound having a structure of the following formula (II):
in which, n is an integer from 2 to 6;
R1 and R2 are independently selected from among an alkyl group, a cycloalkyl group, and an aryl group and optionally combined with the nitrogen atom to form a ring;
Y is selected from among a bond, a carbon atom, a —CR3 group where R3 is a hydrogen atom or an alkyl group or an aryl group, an aryl group, a cycloalkyl group, and a cyclosiloxyl group;
and
X is a linking group of the formula of —(CH2)m— where m is an integer from 4 to 10 and at least one methylene group is optionally substituted with an oxygen atom, a carbonyl group, or an ester group.

26 more elements

A multi-layered electrophotographic positively charged organic photoconductor comprising:

a conductive substrate;
a charge transport layer on the conductive substrate;
and
a charge generating layer on the charge transport layer,
in which a first composition to form the charge transport layer comprises:
at least one hole transport material;
a binder resin;
and
an organic solvent, and
a second composition to form the charge generating layer comprises:
a charge generating material;
a binder resin;
an organic solvent;
and
a hole transport material,
wherein the hole transport material in the composition to form the charge transport layer comprises a hydrazone compound having a structure of the following formula (II):
in which, n is an integer from 2 to 6;
R1 and R2 are independently selected from among an alkyl group, a cycloalkyl group, and an aryl group and optionally combined with the nitrogen atom to form a ring;
Y is selected from among a bond, a carbon atom, a —CR3 group where R3 is a hydrogen atom or an alkyl group or an aryl group, an aryl group, a cycloalkyl group, and a cyclosiloxyl group;
and
X is a linking group of the formula of —(CH2)m— where m is an integer from 4 to 10 and at least one methylene group is optionally substituted with an oxygen atom, a carbonyl group, or an ester group,
wherein the hole transport material in the composition to form the charge generating layer is an amine compound having a structure of the following formula (Ill):
in which, Ar1 is a substituted or unsubstituted aryl group;
Ar2 is selected from the group consisting of a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthylene group, a substituted or unsubstituted biphenylene group, and a substituted or unsubstituted anthrylene group;
R1 is selected from the group consisting of a hydrogen atom, a low alkyl group and a low alkoxy group;
X is selected from the group consisting of a hydrogen atom, a substituted or unsubstituted alkyl group and a substituted or unsubstituted aryl group;
and
Y is a substituted or unsubstituted aryl group.

25 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/674,786Filed 1 Oct 2003
Priority: KR 10-2002-00600132 Oct 2002
Published: US 2004/0121251 A124 Jun 2004
Granted: 3 Oct 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G03G 5/0616
Containing nitrogen: hydrazines; Hydrazones
G03G 5/047
Photoconductive layers characterised by having two or more layers or characterised by their composite structure: characterised by the…
G03G 5/0629
Being five-membered: containing one hetero atom
G03G 5/0672
Containing a methine or polymethine group: containing two or more methine or polymethine groups