Claims
- 1. A photoconductive imaging member comprised of a hole blocking layer, a photogenerating layer, and a charge transport layer, and wherein the hole blocking layer is comprised of a metal oxide; and a mixture of a phenolic compound and a phenolic resin wherein the phenolic compound contains at least two phenolic groups.
- 2. A photoconductive imaging member comprised of a supporting substrate, a hole blocking layer thereover, a photogenerating layer, and a charge transport layer, and wherein the hole blocking layer is comprised of a metal oxide, and a mixture of at least two phenolic resins with dissimilar weight average molecular weights.
- 3. An imaging member in accordance with claim 1 wherein said metal oxide is a titanium oxide.
- 4. An imaging member in accordance with claim 2 wherein said metal oxide is a titanium oxide.
- 5. An imaging member in accordance with claim 2 wherein at least two is two and wherein one of said phenolic resins possesses a lower weight average molecular weight than said second phenolic resin, and wherein said lower is from about 1,000 to about 10,000.
- 6. An imaging member in accordance with claim 5 wherein the weight average molecular weight of said low molecular weight phenolic resin is from about 500 to about 2,000.
- 7. An imaging member in accordance with claim 1 wherein said phenolic compound is 4,4′-sulfonyldiphenol.
- 8. An imaging member in accordance with claim 1 wherein said phenolic compound is 4,4′-isopropylidenediphenol.
- 9. An imaging member in accordance with claim 1 wherein said phenolic compound is 4,4′-ethylidenebisphenol.
- 10. An imaging member in accordance with claim 1 wherein said phenolic compound is bis(4-hydroxyphenyl)methane.
- 11. An imaging member in accordance with claim 1 wherein said phenolic compound is 4,4′-(1,3-phenylenediisopropylidene)bisphenol.
- 12. An imaging member in accordance with claim 1 wherein said phenolic compound is 4,4′-(1,4-phenylenediisopropylidene)bisphenol.
- 13. An imaging member in accordance with claim 1 wherein said phenolic compound is 4,4′-cyclohexylidenebisphenol.
- 14. An imaging member in accordance with claim 1 wherein said phenolic compound is 4,4′-(hexafluoroisopropylidene)diphenol.
- 15. An imaging member in accordance with claim 1 wherein said phenolic compound is 1,3-benzenediol.
- 16. An imaging member in accordance with claim 1 wherein said phenolic compound is 1,4-benzenediol.
- 17. An imaging member in accordance with claim 1 wherein said phenolic compound is of the formula:
- 18. An imaging member in accordance with claim 1 wherein said phenolic resin is selected from the group consisting of a formaldehyde polymer generated with phenol, p-tert-butylphenol and cresol; a formaldehyde polymer generated with ammonia, cresol and phenol; a formaldehyde polymer generated with 4,4′-(1-methylethylidene)bisphenol; a formaldehyde polymer generated with cresol and phenol; and a formaldehyde polymer generated with phenol and p-tert-butylphenol.
- 19. An imaging member in accordance with claim 1 wherein said at least two is from about 2 to about 10, and wherein there is present from about 96 to about 50 weight percent of the phenolic resin.
- 20. An imaging member in accordance with claim 2 wherein said two comprises from about 1 to about 99 weight percent of a first phenolic resin and from about 99 to about 1 weight percent of a second phenolic resin, and wherein the total thereof is about 100 percent.
- 21. An imaging member in accordance with claim 1 wherein said hole blocking layer is of a thickness of about 0.01 to about 30 microns.
- 22. An imaging member in accordance with claim 1 wherein said hole blocking layer is of a thickness of from about 0.1 to about 8 microns.
- 23. An imaging member in accordance with claim 1 comprised in the following sequence of a supporting substrate, said hole blocking layer, an optional adhesive layer, said photogenerating layer, and said charge transport layer, and wherein the charge transport layer is a hole transport layer.
- 24. An imaging member in accordance with claim 23 wherein the adhesive layer is present and is comprised of a polyester with an Mw of about 45,000 to about 75,000, and an Mn of from about 30,000 about 40,000.
- 25. An imaging member in accordance with claim 1 further containing a supporting substrate comprised of a conductive metal substrate of aluminum, aluminized polyethylene terephthalate or titanized polyethylene terephthalate.
- 26. An imaging member in accordance with claim 1 wherein said photogenerator layer is of a thickness of from about 0.05 to about 10 microns, and wherein said transport layer is of a thickness of from about 10 to about 50 microns.
- 27. An imaging member in accordance with claim 1 wherein the photogenerating layer is comprised of a photogenerating pigment or photogenerating pigments dispersed in a resinous binder, and wherein said pigment or pigments are present in an amount of from about 5 percent by weight to about 95 percent by weight, and wherein the resinous binder is selected from the group comprised of vinyl chloride/vinyl acetate copolymers, polyesters, polyvinyl butyrals, polycarbonates, polystyrene-b-polyvinyl pyridine, and polyvinyl formals.
- 28. An imaging member in accordance with claim 1 wherein the charge transport layer comprises aryl amines, and which aryl amines are of the formula
- 29. An imaging member in accordance with claim 28 wherein alkyl contains from about 1 to about 10 carbon atoms.
- 30. An imaging member in accordance with claim 28 wherein the aryl amine is N,N′-diphenyl-N,N-bis(3-methyl phenyl)-1,1′-biphenyl-4,4′-diamine.
- 31. An imaging member in accordance with claim 1 wherein the photogenerating layer is comprised of metal phthalocyanines, or metal free phthalocyanines.
- 32. An imaging member in accordance with claim 1 wherein the photogenerating layer is comprised of titanyl phthalocyanines, perylenes, or hydroxygallium phthalocyanines.
- 33. An imaging member in accordance with claim 1 wherein the photogenerating layer is comprised of Type V hydroxygallium phthalocyanine.
- 34. A method of imaging which comprises generating an electrostatic latent image on the imaging member of claim 1, developing the latent image, and transferring the developed electrostatic image to a suitable substrate.
- 35. A photoconductive imaging member comprised of a supporting substrate, a hole blocking layer, a photogenerating layer, and a charge transport layer, and wherein the hole blocking layer is comprised of a mixture of a metal oxide, and a phenolic compound and a phenolic resin.
- 36. A photoconductive imaging member in accordance with claim 35 wherein said phenolic compound is bisphenol A (4,4′-isopropylidenediphenol), E (4,4′-ethylidenebisphenol), F (bis(4-hydroxyphenyl)methane), M (4,4′-(1,3-phenylenediisopropylidene) bisphenol), P (4,4′-(1,4-phenylenediisopropylidene)bisphenol), S (4,4′-sulfonyldiphenol), Z (4,4′-cyclohexylidenebisphenol), hexafluorobisphenol A (4,4′-(hexafluoroisopropylidene)diphenol), resorcinol, hydroxyquinone or catechin, and wherein said blocking layer is provided on an aluminum drum followed by heat curing said member at a temperature of from about 135° C. to about 185° C.
- 37. A photoconductive imaging member comprised of a supporting substrate, a hole blocking layer, a photogenerating layer, and a charge transport layer, and wherein the hole blocking layer is comprised of a metal oxide, at least two phenolic resins and a phenolic compound.
- 38. A photoconductive imaging member in accordance with claim 37 wherein said blend is comprised of a first resin that possesses a weight average molecular weight of from about 500 to about 2,000, and a said second resin that possesses a weight average molecular weight of from about 2,000 to about 20,000, and wherein said blocking layer is provided on an aluminum drum followed by heat curing said member at a temperature of from about 135° C. to about 185° C.
- 39. An imaging member in accordance with claim 1 wherein the phenolic compound contains from about 2 to about 10 phenolic groups.
- 40. An imaging member in accordance with claim 1 wherein at least two is from about 2 to about 10.
- 41. An imaging member in accordance with claim 1 wherein at least two is from about 2 to about 7.
- 42. An imaging member in accordance with claim 2 wherein at least two is two, and wherein said mixture is comprised of a first phenolic resin with a weight average molecular weight of from about 3,000 to about 17,000, and a second phenolic resin with a weight average molecular weight of from about 700 to about 1,500.
- 43. An imaging member in accordance with claim 18 wherein said resin possesses a weight average molecular weight of from about 500 to about 40,000.
- 44. A photoconductive imaging member in accordance with claim 35 wherein said hole blocking layer contains a phenolic resin mixture.
- 45. A photoconductive imaging member in accordance with claim 44 wherein said phenolic resin is comprised of at least two resins.
- 46. A photoconductive imaging member in accordance with claim 45 wherein said phenolic resins possess dissimilar weight average molecular weights.
- 47. A photoconductive imaging member in accordance with claim 35 wherein said blocking layer provided on said substrate is cured by heating.
- 48. An imaging member in accordance with claim 1 wherein said blocking layer is cured by heating subsequent to it being deposited on a supporting substrate.
- 49. An imaging member in accordance with claim 48 wherein said substrate is aluminum and said curing is at a temperature of from about 135° C. to about 195° C.
- 50. An imaging member in accordance with claim 2 wherein said blocking layer is cured by heating subsequent to it being deposited on said supporting substrate.
- 51. An imaging member in accordance with claim 50 wherein said heating is at a temperature of from bout 135° C. to about 185° C.
- 52. An imaging member in accordance with claim 23 wherein said blocking layer is cured by heating subsequent to it being deposited on said supporting substrate.
- 53. An imaging member in accordance with claim 28 wherein said blocking layer is cured by heating subsequent to it being deposited on said supporting substrate.
- 54. An imaging member in accordance with claim 37 wherein said blocking layer is cured by heating subsequent to said blocking layer being deposited on said supporting substrate.
- 55. An imaging member in accordance with claim 38 wherein said blocking layer is cured by heating subsequent to being deposited on a supporting substrate.
- 56. An imaging member in accordance with claim 35 further containing in said hole blocking layer a suitable dopant.
- 57. An imaging member in accordance with claim 35 wherein said phenolic compound is comprised of a mixture of said compounds.
- 58. An imaging member in accordance with claim 36 wherein said mixture is comprised of about 2 to about 7 phenolic compounds.
- 59. A photoconductive imaging member in accordance with claim 1 wherein said blocking layer includes a dopant component.
- 60. A photoconductive imaging member in accordance with claim 59 wherein said dopant is a silicon oxide.
CROSS REFERENCE
[0001] There is illustrated in copending U.S. Ser. No. ______ (not yet assigned-D/A2262), entitled Photoconductive Imaging Members, filed concurrently herewith, the disclosure of which is totally incorporated herein by reference, a photoconductive imaging member comprised of a supporting substrate, a hole blocking layer thereover, a crosslinked photogenerating layer and a charge transport layer, and wherein the photogenerating layer is comprised of a photogenerating component and a vinyl chloride, allyl glycidyl ether, hydroxy containing polymer.