Claims
- 1. A method for producing a lithographic printing plate which comprises:
- (a) providing a support comprising an iron foil prepared by electroforming, wherein one surface of said foil is in contact with an electrolyte and the opposite surface is in contact with a negative electrode, said surface in contact with said electrolyte having a relatively rough surface compared to said surface in contact with said negative electrode and wherein the porosity of said surface in contact with said electrolyte is about 4-8.5.mu., said foil being electroplated with a hydrophilic metal on both surfaces to form a hydrophilic metal layer sufficiently thin as to substantially retain the porosity of the iron foil, and
- (b) providing an oleophilic image area formed from a photosensitive resin on said surface of the hydrophilic metal coated iron foil, which was in contact with said electrolyte and a non-image area where said resin is not present on said surface of said hydrophilic metal coated iron foil which was in contact with said electolyte,
- said non-image area exhibiting good hydrophilic and water retentive properties in lithographic printing.
- 2. The method according to claim 1, wherein the iron foil is laminated with a reinforcing sheet on the surface which was in contact with the negative electrode during the electroforming.
- 3. The method according to claim 2, wherein the reinforcing sheet is made of paper, cloth, non-woven cloth, plastic resin or synthetic paper.
- 4. The method according to claim 1, wherein the hydrophilic metal is zinc, chromium or nickel.
- 5. The method according to claim 1, wherein the iron foil has a thickness of 0.003 to 0.150 mm.
- 6. The method according to claim 1 wherein the porosity of the surface in contact with the negative electrode is 1 to 2.mu..
Priority Claims (2)
Number |
Date |
Country |
Kind |
55-34641 |
Mar 1980 |
JPX |
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55-34642 |
Mar 1980 |
JPX |
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Parent Case Info
This is a Rule 60 divisional application of Ser. No. 454,554, filed Dec. 30, 1982 which, in turn, is a continuation application of Ser. No. 244,648, filed Mar. 17, 1981, now abandoned.
US Referenced Citations (23)
Foreign Referenced Citations (2)
Number |
Date |
Country |
A2283462 |
Mar 1976 |
FRX |
1413110 |
Nov 1975 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
454554 |
Dec 1982 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
244648 |
Mar 1981 |
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