Imaging member having a dual charge transport layer
First Claim
1. An imaging member comprisingan electrically conductive supporting substrate or a supporting substrate comprising an electrically conductive layer;
- an optional hole blocking layer;
a charge generating layer; and
a charge transport layer having at least a first (bottom) charge transport layer and a second (top) charge transport layer each of which comprises a hole mobility organic transport compound molecularly dispersed in a film forming polymer binder;
wherein the first (bottom) charge transport layer comprises a hole mobility organic transport compound selected from the group consisting of triphenylmethane;
bis(4-diethylamine-2-methylphenyl)phenylmethane;
4,4′
-bis(diethylamino)-2,2′
-dimethyltriphenyl-methane;
N,N′
-diphenyl-N,N′
-bis(3-methylphenyl)-[1,1′
-biphenyl]-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(4-methylphenyl)-[1,1′
-biphenyl]-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(alkylphenyl)-1,1′
-biphenyl-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(chlorophenyl)-1,1′
-biphenyl-4,4′
-diamine;
tritolylamine;
N,N′
-bis-(3,4-dimethylphenyl)-4-biphenyl amine;
N,N′
-bis-(4-methylphenyl)-N,N′
-bis(4-ethylphenyl)-1,1′
-(3,3′
-dimethylbiphenyl)-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(halophenyl)-1,1′
-biphenyl-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(hydroxyphenyl)-1,1′
-biphenyl-4,4′
-diamine;
phenanthrene diamine;
arylamine;
enamine;
stilbene; and
hydrazone molecules; and
wherein the first (bottom) charge transport layer comprises between about 50 and about 90 weight percent hole mobility organic transport compound based on the total weight of the first (bottom) charge transport layer;
wherein the second (top) charge transport layer comprises a film forming polymer binder and a high hole mobility organic transport compound selected from the group consisting of a diamine represented by the formula;
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Accused Products
Abstract
An imaging member having a charge transport layer with multiple regions or layers is provided. The charge transport layer includes at least two charge transport layers coated from solutions of different components and concentrations, wherein the second (top) transport layer comprises a lower concentration of different charge transport compound than the first (bottom) charge transport layer. The charge transport compound included in the second (top) charge transport layer is a high mobility hole transport compound. The charge transport compound in each layer is dissolved or molecularly dispersed in an electrically inactive film forming polymer to form a solid solution. In such a construction, the resulting dual charge transport layer exhibits enhanced cracking suppression, improves wear resistance, provides excellent imaging member electrical performance, and delivers improved print quality.
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Citations
10 Claims
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1. An imaging member comprising
an electrically conductive supporting substrate or a supporting substrate comprising an electrically conductive layer; -
an optional hole blocking layer; a charge generating layer; and a charge transport layer having at least a first (bottom) charge transport layer and a second (top) charge transport layer each of which comprises a hole mobility organic transport compound molecularly dispersed in a film forming polymer binder; wherein the first (bottom) charge transport layer comprises a hole mobility organic transport compound selected from the group consisting of triphenylmethane;
bis(4-diethylamine-2-methylphenyl)phenylmethane;
4,4′
-bis(diethylamino)-2,2′
-dimethyltriphenyl-methane;
N,N′
-diphenyl-N,N′
-bis(3-methylphenyl)-[1,1′
-biphenyl]-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(4-methylphenyl)-[1,1′
-biphenyl]-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(alkylphenyl)-1,1′
-biphenyl-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(chlorophenyl)-1,1′
-biphenyl-4,4′
-diamine;
tritolylamine;
N,N′
-bis-(3,4-dimethylphenyl)-4-biphenyl amine;
N,N′
-bis-(4-methylphenyl)-N,N′
-bis(4-ethylphenyl)-1,1′
-(3,3′
-dimethylbiphenyl)-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(halophenyl)-1,1′
-biphenyl-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(hydroxyphenyl)-1,1′
-biphenyl-4,4′
-diamine;
phenanthrene diamine;
arylamine;
enamine;
stilbene; and
hydrazone molecules; andwherein the first (bottom) charge transport layer comprises between about 50 and about 90 weight percent hole mobility organic transport compound based on the total weight of the first (bottom) charge transport layer; wherein the second (top) charge transport layer comprises a film forming polymer binder and a high hole mobility organic transport compound selected from the group consisting of a diamine represented by the formula; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An imaging member comprising
an electrically conductive supporting substrate or a supporting substrate comprising an electrically conductive layer; -
an optional hole blocking layer; a charge generating layer; and a dual charge transport layer having a first (bottom) and a second (top) charge transport layer each of which is a solid solution comprising a hole mobility organic transport compound molecularly dispersed or dissolved in a film forming polymer binder; wherein the first (bottom) charge transport layer comprises a hole mobility organic transport compound selected from the group consisting of triphenylmethane;
bis(4-diethylamine-2-methylphenyl)phenylmethane;
4,4′
-bis(diethylamino)-2,2′
-dimethyltriphenylmethane;
N,N′
-diphenyl-N,N′
-bis(3-methylphenyl)-[1,1′
-biphenyl]-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(4-methylphenyl)-[1,1′
-biphenyl]-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(alkylphenyl)-1,1′
-biphenyl-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(chlorophenyl)-1,1′
-biphenyl-4,4′
-diamine;
tritolylamine;
N,N′
-bis-(3,4-dimethylphenyl)-4-biphenyl amine;
N,N′
-bis-(4-methylphenyl)-N,N′
-bis(4-ethylphenyl)-1,1′
-(3,3′
-dimethylbiphenyl)-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(halophenyl)-1,1′
-biphenyl-4,4′
-diamine;
N,N′
-diphenyl-N,N′
-bis(hydroxyphenyl)-1,1′
-biphenyl-4,4′
-diamine;
phenanthrene diamine;
arylamine;
enamine;
stilbene; and
hydrazone molecules; andwherein the first (bottom) charge transport layer comprises between about 50 and about 90 weight percent hole mobility organic transport compound based on the total weight of the first (bottom) charge transport layer; wherein the second (top) charge transport layer comprises a film forming polymer binder and a high hole mobility organic transport compound selected from the group consisting of a diamine represented by the formula;
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Specification