Claims
- 1. A method for making a lithographic printing plate which comprises placing, opposite to each other, (i) a printing sheet comprising a conductive support selected from the group consisting of a metal sheet, a metal-deposited film and a metal foil-laminated film, having thereon a dielectric non-photosensitive layer, and a photoreceptor comprising a film support having a conductive layer on which an organic photoconductive compound is provided, imagewise exposing the photoreceptor from a light transmitting side while applying a direct voltage between said conductive support and said conductive layer by a direct current source to form a positive electrostatic latent image on said non-photosensitive layer of the printing sheet and then subjecting the image to wet developing and fixation.
- 2. A method according to claim 1, wherein the dielectric non-photosensitive layer is a hydrophilic layer or a layer capable of being converted to a hydrophilic layer in its surface.
- 3. A method according to claim 2, wherein the surface of the printing sheet or the photoreceptor is roughened and an air space of about 1-20 .mu.m is provided between the printing sheet and the photoreceptor which are placed opposite to each other.
- 4. A method according to claim 3, wherein the dielectric non-photosensitive layer of the printing sheet contains about 0.1 to about 5% by weight of fine particles having an average particle size of about 1 to about 20 .mu.m.
- 5. A method according to claim 4, wherein the dielectric non-photosensitive layer of the printing sheet has a thickness of 5 .mu.m or less.
- 6. A method according to claim 1, wherein the film support of the photoreceptor is a light transmitting film; the support of the printing sheet is a support subjected to sandblasting and anodizing treatments; exposure is carried out from a photoreceptor side; the dielectric non-photosensitive layer contains an alkali-soluble resin; and after the development and fixation, the non-image portion is removed by etching.
- 7. A method according to claim 6, wherein the surface of the printing sheet or the photoreceptor is roughened and an air space of about 1-20 .mu.m is provided between the printing sheet and the photoreceptor, which are placed opposite to each other.
- 8. A method according to claim 7, wherein the dielectric non-photosensitive layer of the printing sheet contains about 0.1 to about 5% by weight of fine particles having an average particle size of about 1 to about 20 .mu.m.
- 9. A method according to claim 8, wherein the dielectric non-sensitive layer of the printing sheet has a thickness of 5 .mu.m or less.
Priority Claims (2)
Number |
Date |
Country |
Kind |
62-54450 |
Mar 1987 |
JPX |
|
62-92436 |
Apr 1987 |
JPX |
|
Parent Case Info
This is a continuation of application No. 07/496,157, filed on Mar. 19, 1990, which was abandoned upon the filing hereof, which is a continuation of application No. 07/140,559, filed Jan. 4, 1988, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1219849 |
Jan 1971 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Research Disclosure, No. 154 Feb. 1977 pp. 16-17 R. F. Reithel "Lithography Plates of Electrically Activated Polymers". |
"Charge Transfer Electrophotography" by R. L. Jepen and G. F. Day; Electrophotography 2nd International Conference p. 28. |
Continuations (2)
|
Number |
Date |
Country |
Parent |
496157 |
Mar 1990 |
|
Parent |
140559 |
Jan 1988 |
|