US5401615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overcoating for multilayered organic photoreceptors containing a stabilizer and charge transport molecules
Assignee: Xerox Corp
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Filing: 1994-06-17
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Granted: 1995-03-28
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Expires: 2014-06-17
Abstract
Abstract An electrophotographic imaging member fabricated by forming on a charge generating layer a first coating including charge transporting molecules dispersed in a solution of a first polymer binder dissolved in a first solvent, drying the coating to remove the solvent to form a substantially dry charge transport layer, forming on the charge transport layer a second coating including charge transporting molecules and a chemical stabilizer additive selected from the group consisting of a nitrone, isobenzofuran, hydroxyaromatic compound and mixtures thereof molecularly dispersed in an electrically inactive second polymer binder in a solution of a second polymer binder dissolved in a second solvent, the first polymer binder being insoluble in the second solvent, and drying the second coating to remove the second solvent to form a substantially dry overcoat layer. This electrophotographic imaging member may be utilized in an electrophotographic imaging process.
Inventors
- 👤 Damodar M. Pai
- 👤 Paul J. DeFeo
- 👤 Kathleen M. Carmichael
- 👤 Dale S. Renfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:44
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0503; G03G5/051; G03G5/0521; G03G5/043; G03G5/047; G03G5/0514; G03G5/0517; G03G5/14; G03G5/147; G03G5/14708
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
111 words
An electrophotographic imaging member comprising a substrate, a charge generating layer, a charge transport layer comprising electrically active charge transporting molecules dissolved or molecularly dispersed in a first electrically inactive polymer binder, and an overcoat layer comprising charge transporting molecules and a chemical stabilizer additive selected from the group consisting of a nitrone, isobenzofuran, fused hydroxyaromatic compound, phenolic compound and mixtures thereof molecularly dispersed in an electrically inactive second polymer binder, said second polymer binder being soluble in a solvent in which said first polymer binder is insoluble whereby the bulk of said charge transport layer is substantially free of said nitrone, isobenzofuran, fused hydroxyaromatic compound, phenolic compound and mixtures thereof.
Claim 2
Dependent Claim
111 words
An electrophotographic imaging member comprising a substrate, a charge generating layer, a charge transport layer comprising electrically active charge transporting molecules dissolved or molecularly dispersed in a first electrically inactive polymer binder, and an overcoat layer comprising charge transporting molecules and a chemical stabilizer additive selected from the group consisting of a nitrone, isobenzofuran, fused hydroxyaromatic compound, phenolic compound and mixtures thereof molecularly dispersed in an electrically inactive second polymer binder, said second polymer binder being soluble in a solvent in which said first polymer binder is insoluble whereby the bulk of said charge transport layer is substantially free of said nitrone, isobenzofuran, fused hydroxyaromatic compound, phenolic compound and mixtures thereof.
Claim 3
Dependent Claim
16 words
An electrophotographic imaging member according to claim 1 wherein said first polymer binder is poly(4,4'-isopropylidine-diphenylene carbonate.
Claim 4
Dependent Claim
16 words
An electrophotographic imaging member according to claim 1, wherein said second polymer binder is poly(4,4'-cyclohenylidinediphenylene) carbonate.
Claim 5
Dependent Claim
75 words
An electrophotographic imaging member according to claim 1 wherein said chemical stabilizer is a nitrone compound having the structural formula: ##STR9## wherein R 1 is selected from the group consisting of a substituted and unsubstituted phenyl group, fused ring aromatic group and heterocyclic group, and R 2 is selected from the group consisting of a linear or branched alkyl group containing 1 to 20 carbon atoms, a fused ring aromatic group and a heterocyclic group.
Claim 6
Dependent Claim
61 words
An electrophotographic imaging member according to claim 1 wherein said chemical stabilizer has the structural formula: ##STR10## wherein R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 are independently selected from the group consisting of substituted and unsubstituted alkyl groups containing 1 to 10 carbon atoms and substituted and unsubstituted phenyl groups.
Claim 7
Dependent Claim
111 words
An electrophotographic imaging member according to claim 1 wherein said chemical stabilizer has the structural formula: ##STR11## wherein R 9 , R 10 , R 11 and R 12 are independently selected from the group consisting of hydrogen, a hydroxyl group, an alkoxy group containing 1 to 6 carbon atoms and an alkyl group containing 1 to 6 carbon atoms, wherein at least one or said R 9 , R 10 , R 11 and R 12 is a hydroxyl group, and R 13 and R 14 are independently selected from hydrogen, an alkenyl group containing 3 to 40 carbon atoms and an alkyl group containing 1 to 40 carbon atoms.
Claim 8
Dependent Claim
101 words
An electrophotographic imaging member according to claim 1 in which said chemical stabilizer is a monomeric or polymeric phenolic compound having the structural formula: ##STR12## wherein R 15 , R 16 , R 18 and R 19 are independently selected from hydrogen, a hydroxyl group, and substituted and unsubstituted groups selected from the group consisting of a linear alkyl group containing 1 to 20 carbon atoms, a branched alkyl group containing 1 to 20 carbon atoms, an alkenyl group containing 1 to 20 carbon atoms, a phenyl group, a naphthyl group, and an alkoxy group containing 1 to 20 carbon atoms.
Claim 9
Dependent Claim
40 words
An electrophotographic imaging member according to claim 1 wherein the concentration of said charge transporting molecule in said overcoat layer is between about 5 percent and about 50 percent by weight based on the total weight of said overcoat layer.
Claim 10
Dependent Claim
39 words
An electrophotographic imaging member according to claim 1 wherein the concentration of said chemical stabilizer additive in said overcoat layer is between about 0.05 and about 10 percent by weight based on the total weight of said overcoat layer.
Claim 11
Dependent Claim
19 words
An electrophotographic imaging member according to claim 1 wherein said charge transporting molecule in said transport layer is N,N'-diphenyl-N,N'-bis(3-methyl-phenyl)-(1,1'biphenyl)-4,4'-diamine.
Claim 12
Dependent Claim
19 words
An electrophotographic imaging member according to claim 1 wherein said charge transporting molecule in said overcoat layer is N,N'-diphenyl-N,N'-bis(3-methyl-phenyl)-(1,1'biphenyl)-4,4'-diamine.
Claim 13
Dependent Claim
23 words
An electrophotographic imaging member according to claim 1 wherein said overcoat layer has a thickness between about 0.5 micrometer and about 10 micrometers.
Claim 14
Dependent Claim
25 words
An electrophotographic imaging member according to claim 1 wherein said charge transport layer has a thickness of between about 5 micrometers and about 50 micrometers.
Claim 15
Dependent Claim
197 words
An imaging process comprising providing an electrophotographic imaging member comprising a substrate, a charge generating layer, a charge transport layer comprising electrically active charge transporting molecules dissolved or molecularly dispersed in a first electrically inactive polymer binder, and an overcoat layer having an outer surface comprising charge transporting molecules and a chemical stabilizer additive selected from the group consisting of a nitrone, isobenzofuran, fused hydroxyaromatic compound, phenolic compound and mixtures thereof molecularly dispersed in an electrically inactive second polymer binder, said second polymer binder being soluble in a solvent in which said first polymer binder is insoluble whereby the bulk of said charge transport layer is substantially free of said nitrone, isobenzofuran, fused hydroxyaromatic compound, phenolic compound and mixtures thereof, depositing a uniform electrostatic charge on the outer surface of said overcoating layer with a corona charging device, exposing said imaging member to a light image pattern to form an electrostatic latent image on the outer surface of said overcoating layer, developing said electrostatic latent image with electrostatically attractable marking particles to form a visible toner image, transferring said toner image to a receiving member and repeating said depositing, exposing, developing and transferring steps at least once.
Claim 16
Dependent Claim
197 words
An imaging process comprising providing an electrophotographic imaging member comprising a substrate, a charge generating layer, a charge transport layer comprising electrically active charge transporting molecules dissolved or molecularly dispersed in a first electrically inactive polymer binder, and an overcoat layer having an outer surface comprising charge transporting molecules and a chemical stabilizer additive selected from the group consisting of a nitrone, isobenzofuran, fused hydroxyaromatic compound, phenolic compound and mixtures thereof molecularly dispersed in an electrically inactive second polymer binder, said second polymer binder being soluble in a solvent in which said first polymer binder is insoluble whereby the bulk of said charge transport layer is substantially free of said nitrone, isobenzofuran, fused hydroxyaromatic compound, phenolic compound and mixtures thereof, depositing a uniform electrostatic charge on the outer surface of said overcoating layer with a corona charging device, exposing said imaging member to a light image pattern to form an electrostatic latent image on the outer surface of said overcoating layer, developing said electrostatic latent image with electrostatically attractable marking particles to form a visible toner image, transferring said toner image to a receiving member and repeating said depositing, exposing, developing and transferring steps at least once.
Claim 17
Dependent Claim
54 words
An imaging process according to claim 14 including repeating said depositing, exposing, developing and transferring steps at least 1,000 times in a single run, resting said imaging member between about 5 minutes and about 30 minutes, and repeating said depositing, exposing, developing and transferring steps at least 10 additional times in another single run.
Claim 18
Dependent Claim
144 words
A process for fabricating an electrophotographic imaging member comprising providing a substrate coated with a charge generating layer, forming on said charge generating layer a first coating comprising charge transporting molecules dispersed in a solution of a first polymer binder dissolved in a first solvent, drying: said coating to remove said first solvent to form a substantially dry charge transport layer, forming on said charge transport layer a second coating comprising charge transporting molecules and a chemical stabilizer additive selected from the group consisting of a nitrone, isobenzofuran, fused hydroxyaromatic compound, phenolic compound and mixtures thereof molecularly dispersed in an electrically inactive second polymer binderin a solution of a second polymer binder dissolved in a second solvent, said first polymer binder being insoluble in said second solvent, and drying said second coating to remove said second solvent to form a substantially dry overcoat layer.
Claim 19
Dependent Claim
144 words
A process for fabricating an electrophotographic imaging member comprising providing a substrate coated with a charge generating layer, forming on said charge generating layer a first coating comprising charge transporting molecules dispersed in a solution of a first polymer binder dissolved in a first solvent, drying: said coating to remove said first solvent to form a substantially dry charge transport layer, forming on said charge transport layer a second coating comprising charge transporting molecules and a chemical stabilizer additive selected from the group consisting of a nitrone, isobenzofuran, fused hydroxyaromatic compound, phenolic compound and mixtures thereof molecularly dispersed in an electrically inactive second polymer binderin a solution of a second polymer binder dissolved in a second solvent, said first polymer binder being insoluble in said second solvent, and drying said second coating to remove said second solvent to form a substantially dry overcoat layer.
Claim 20
Dependent Claim
24 words
A process for fabricating an electrophotographic imaging member according to claim 16 wherein said first coating is substantially free of said chemical stabilizer additive.
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