Claims
- 1. An electrophotographic imaging method comprising providing a photoreceptor comprising in the stated order a substrate; a layer of charge carrier injecting material dispersed in a polymer, the material being selected from the group consisting of carbon black and graphite; a layer of charge carrier transport material capable of transporting holes and injecting holes into a layer of charge carrier generating material which is capable of injecting photogenerated holes into the charge carrier transport material; and a layer of electrically insulating material;
- charging the photoreceptor with negative electrostatic charges;
- charging the photoreceptor with positive electrostatic charges in order to substantially neutralize the negative charge residing on the surface of the photoreceptor and exposing the photoreceptor to an imagewise pattern of electromagnetic radiation to which the charge carrier generating material is responsive whereby there is formed an electrostatic latent image within the photoreceptor.
- 2. A method in accordance with claim 1 and further including the step of forming a visible image by contacting the surface of the photoreceptor with electroscopic marking materials.
- 3. A method in accordance with claim 1 wherein the carrier injecting material is carbon black dispersed in a polyester.
- 4. A method in accordance with claim 1 wherein the carrier injecting material is graphite dispersed in a polymer.
- 5. A method in accordance with claim 1 wherein the transport layer is N,N'-diphenyl-N,N'-bis(3-methyl phenyl)-[1,1'-biphenyl]-4,4'-diamine and the generating layer is selected from amorphous selenium, trigonal selenium, arsenic triselenide, metal free phthalocyanines and metal phthalocyanines.
- 6. A method in accordance with claim 1 wherein the charge carrier injecting layer possesses sufficient lateral conductivity to serve as a ground electrode for the photoreceptor.
- 7. A method in accordance with claim 1 wherein the substrate includes a conductive layer located in contact with the charge carrier injecting layer.
- 8. A method in accordance with claim 1 wherein the injecting layer has a thickness of from about 1 to about 20 microns, and the charge transport layer has a thickness of from about 5 to about 50 microns.
- 9. A method in accordance with claim 1 wherein the first polarity is negative and the second polarity is positive.
- 10. A method for bonding a substrate to a charge carrier transport material by using an intermediate hole injecting electrode comprised of materials dispersed in a polymer, the materials being selected from the group consisting of carbon black and graphite.
- 11. A method in accordance with claim 10 wherein carbon black is dispersed in a polyester.
- 12. A method in accordance with claim 10 wherein graphite is dispersed in a polyester.
Parent Case Info
This is a division of application Ser. No. 905,250, filed May 12, 1978.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
905250 |
May 1978 |
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