Imaging members
First Claim
1. An imaging member comprising a supporting substrate, an optional electrically conductive layer, an optional hole blocking layer, a charge generating layer, 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-diethyamine-2-methylphenyl)phenylmethane;
44′
-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-methyl-phenyl)-[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;
phenanthrene diamine;
arylamine;
enamine;
stylbene; and
hydrozone 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, and 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;
where R1, R2, R3, R4, R5, and R6 are each independently selected from the group consisting of hydrogen, halogen, and an alkyl, an aryl, or a cyclo-alkyl group having 1 to 18 carbon atoms, and wherein the second (top) charge transport layer comprises a lesser amount by weight of this high hole mobility diamine organic transport compound than the hole transport compound used in the first (bottom) charge transport layer, and the film forming polymer binder is selected from the group consisting of polycarbonates, polystyrene, polyesters, polyvinyl butyrals, polystyrene-b-polyvinyl pyridine, poly(vinyl butyral), poly(vinyl carbazole), poly(vinyl chloride), polyacrylates, polymethacrylates, copolymers of vinyl chloride and vinyl acetate, phenoxy resins, polyurethanes, poly(vinyl alcohol), and polyacrylonitrile.
5 Assignments
0 Petitions
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.
-
Citations
23 Claims
-
1. An imaging member comprising
a supporting substrate, an optional electrically conductive layer, an optional hole blocking layer, a charge generating layer, 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-diethyamine-2-methylphenyl)phenylmethane;
44′
-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-methyl-phenyl)-[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;
phenanthrene diamine;
arylamine;
enamine;
stylbene; and
hydrozone 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,and 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;
where R1, R2, R3, R4, R5, and R6 are each independently selected from the group consisting of hydrogen, halogen, and an alkyl, an aryl, or a cyclo-alkyl group having 1 to 18 carbon atoms, and wherein the second (top) charge transport layer comprises a lesser amount by weight of this high hole mobility diamine organic transport compound than the hole transport compound used in the first (bottom) charge transport layer, and the film forming polymer binder is selected from the group consisting of polycarbonates, polystyrene, polyesters, polyvinyl butyrals, polystyrene-b-polyvinyl pyridine, poly(vinyl butyral), poly(vinyl carbazole), poly(vinyl chloride), polyacrylates, polymethacrylates, copolymers of vinyl chloride and vinyl acetate, phenoxy resins, polyurethanes, poly(vinyl alcohol), and polyacrylonitrile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- bis(4-diethyamine-2-methylphenyl)phenylmethane;
-
10. An imaging member comprising:
-
a supporting substrate;
a charge generating layer deposited thereon; and
,a charge transport layer deposited on the charge generating layer, wherein the charge transport layer comprises at least a first charge transport layer and a second charge transport layer deposited thereon, and wherein each of said charge transport layers comprises a solid solution of charge transport compounds molecularly dispersed in a binder, wherein the charge transport compounds of the first charge transport layer comprise aryl amines or diamines and the charge transport compounds of the second charge transport layer comprise high mobility hole transport molecules, and wherein the weight percent of charge transport compounds in the solid solution of the second charge transport layer is less than the weight percent of charge transport components of the first charge transport layer. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 22)
-
-
23. An imaging member comprising
a supporting substrate, an optional electrically conductive layer, an optional hole blocking layer, a charge generating layer, 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-diethyamine-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-methyl-phenyl)-[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;
phenanthrene diamine;
arylamine;
enamine;
stylbene; and
hydrozone 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,and 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;
where R1, R2, R3, R4, R5, and R6 are each independently selected from hydrogen, halogen, and an alkyl, an aryl, or a cyclo-alkyl group having 1 to 18 carbon atom, and wherein the second (top) charge transport layer comprises a lesser amount by weight of this high hole mobility organic transport compound than the first (bottom) charge transport layer, and the film forming polymer binder is selected from the group consisting of polycarbonates, polystyrene, polyesters, polyvinyl butyrals, polystyrene-b-polyvinyl pyridine, poly(vinyl butyral), poly(vinyl carbazole), poly(vinyl chloride), polyacrylates, polymethacrylates, copolymers of vinyl chloride and vinyl acetate, phenoxy resins, polyurethanes, poly(vinyl alcohol), and polyacrylonitrile.
- bis(4-diethyamine-2-methylphenyl)phenylmethane;
Specification