Single layer photoreceptor comprising high mobility transport mixtures
View Patent ↗The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrophotographic, including digital, apparatuses. In particular, the present embodiments pertain to an improved imaging member comprising a single layer in which the single layer further comprises a combination of one or more high mobility hole (charge) transport molecules and electron transport molecules.
1. An imaging member comprising:
a substrate; and
a single layer disposed over the substrate, the single layer further comprising a Type V hydroxygallium phthalocyanine pigment, a binder, and a combination of high mobility charge transport molecules and electron transport molecules, wherein the high mobility charge transport molecules are selected from the group consisting of N,N′-bis(4-methylphenyl)-N,N′-bis[4-(n-butyl)phenyl]-[p-terphenyl]-4,4″-diamine, N,N,N′,N′-tetra-p-tolyl-1,1′-biphenyl-4,4′-diamine, and mixtures thereof, and the electron transport molecule is ethyl hexyl carbonyl fluorenylidene malononitrile;
wherein a weight ratio of the high mobility charge transport molecules to electron transport molecules is from 40:10 to 30:20, based on the total weight of the single layer.
2. The imaging member of claim 1 , wherein the single layer has a thickness of from about 10 μm to about 35 μm.
3. The imaging member of claim 2 , wherein the single layer has a thickness of from about 12 μm to about 28 μm.
4. The imaging member of claim 3 , wherein the single layer has a thickness of from about 14 μm to about 21 μm.
5. The imaging member of claim 1 , wherein a weight ratio of the high mobility charge transport molecules to electron transport molecules is 40:10.
6. The imaging member of claim 1 , wherein the binder is a 4,4′-cyclohexylidenebisphenol (Bisphenol Z)-type polycarbonate selected from the group consisting of a Bisphenol-Z polycarbonate (PCZ) having a weight average molecular weight of 40,000, a Bisphenol-Z polycarbonate (PCZ) having a weight average molecular weight of 51,000, and Bisphenol-Z polycarbonate (PCZ) having a weight average molecular weight of 80,000.
7. An imaging member comprising:
a substrate; and
a single layer disposed over the substrate, wherein the single layer is formed from a solution comprising
a Type V hydroxygallium phthalocyanine pigment, a binder, and a combination of high mobility charge transport molecules and electron transport molecules dissolved in a solvent, the high mobility charge transport molecules being selected from the group consisting of N,N′-bis(4-methylphenyl)-N,N′-bis[4-(n-butyl)phenyl]-[p-terphenyl]-4,4″-diamine, N,N,N′,N′-tetra-p-tolyl-1,1′-biphenyl-4,4′-diamine, and mixtures thereof, and the electron transport molecule is ethyl hexyl carbonyl fluorenylidene malononitrile;
wherein a weight ratio of the high mobility charge transport molecules to electron transport molecules is from 40:10 to 30:20, based on the total weight of the single layer.
8. The imaging member of claim 7 , wherein the solvent is selected from the group consisting of tetrahydrofuran, monochlorobenzene, cyclohexanone, methylene chloride, toluene, and mixtures thereof.
9. An image forming apparatus for forming images on a recording medium comprising:
a) an imaging member having a charge retentive-surface for receiving an electrostatic latent image thereon, wherein the imaging member comprises
a substrate, and
a single layer disposed over the substrate, the single layer further comprising a Type V hydroxygallium phthalocyanine pigment, a binder, and a combination of high mobility charge transport molecules and electron transport molecules, wherein the high mobility charge transport molecules are selected from the group consisting of N,N′-bis(4-methylphenyl)-N,N′-bis[4-(n-butyl)phenyl]-[p-terphenyl]-4,4″-diamine, N,N,N′,N′-tetra-p-tolyl-1,1-biphenyl-4,4′-diamine, and mixtures thereof, and the electron transport molecule is ethyl hexyl carbonyl fluorenylidene malononitrile; wherein a weight ratio of the high mobility charge transport molecules to electron transport molecules is from 40:10 to 30:20, based on the total weight of the single layer;
b) a development component for applying a developer material to the charge-retentive surface to develop the electrostatic latent image to form a developed image on the charge-retentive surface;
c) a transfer component for transferring the developed image from the charge-retentive surface to a copy substrate; and
d) a fusing component for fusing the developed image to the copy substrate.
10. The image forming apparatus of claim 9 , wherein the single layer has a thickness of from about 10 μm to about 35 μm.
11. The image forming apparatus of claim 9 , wherein a weight ratio of the high mobility charge transport molecules to electron transport molecules is 40:10.