Claims
- 1. A method of producing a printing plate which comprises:
- a. oxidizing an aluminum plate by anodizing;
- b. etching the resulting oxidized aluminum plate;
- c. treating the oxidized, etched aluminum plate with hot water at about 70.degree. C. to 130.degree. C. or with water vapor to form a printing plate support;
- d. applying an unexposed photosensitive material in layer form to the product of step (c), whereby undesirable increased adhesion between the printing plate support and the photosensitive material with the passage of time is minimized.
- 2. The method of claim 1, wherein the aluminum plate is a plate of pure aluminum or an aluminum alloy.
- 3. The method of claim 1, wherein the treating is with hot water.
- 4. The method of claim 3, wherein the treating with hot water is at a temperature ranging from about 70.degree. C. to about 130.degree. C. for a period of about 10 seconds to 30 minutes and with the hot water having a pH of about 2 to 11.
- 5. The method of claim 1, wherein the treating is with water vapor.
- 6. The method of claim 5, wherein the treating with water vapor is at a temperature of about 100.degree. to 150.degree. C. for a period of from about 10 seconds to 30 minutes with the water vapor having a pH of about 2 to 11 and under a pressure of about 1 to 15 Kg/cm.sup.2.
- 7. The method of claim 1, wherein the etching is with a solution containing an aluminum etching agent.
- 8. The method of claim 1, wherein said etching is conducted to a degree corresponding to about 5 to 75% by weight based on the total weight of the anodized oxide coating.
- 9. The method of claim 7, wherein said etching is conducted to a degree corresponding to about 5 to 75% by weight based on the total weight of the anodized oxide coating.
- 10. The method of claim 1, wherein said water vapor is at a temperature of from about 100.degree. to 150.degree. C.
- 11. The method of claim 7, wherein said water vapor is at a temperature of from about 100.degree. to 150.degree. C.
- 12. The method of claim 1, wherein said aluminum plate is grained prior to said oxidizing.
- 13. The method of claim 1, wherein said etching is conducted to a degree corresponding to about 10 to 65% by weight based on the total weight of the anodized oxide coating.
- 14. The method of claim 1, wherein the product of step (c) is coated with a subbing layer of a hydrophilic polymer material prior to step (d).
- 15. In a method of printing, the improvement which comprises using the printing plate produced by the process of claim 1.
- 16. The method of claim 1, wherein said unexposed photosensitive material comprises sodium 4,4'-diazidostilbene-2,2'-disulfonate, sodium 1,5-diazidonaphthalene-3,7-disulfonate, sodium 3'-azide-4-azidobenzalacetophenone-2-sulfonate, sodium 4,4'-diazidostilbene-.alpha.-carboxylate, sodium di(4-azido-2'-hydroxybenzal)acetone-2-sulfonate, sodium 4-azidobenzalacetophenone-2-sulfonate or sodium 4,4'-diazidodiphenyl-3,3'-disulfonate.
- 17. The method of claim 1, wherein said unexposed photosensitive material comprises poly(vinyl cinnamate), poly(vinyl cinnamoyl ethyl ether), poly(cinnamoyl ethyl acrylate), copolymers containing two of these monomeric units, poly(cinnamoyl methacrylate) and copolymers containing the same recurring units, homo- and copolymers of p-vinylphenyl cinnamate, poly(vinylbenzal acetophenone) and derivatives thereof, poly(vinylcinnamylidene acetate) and derivatives thereof, allyl acrylate prepolymers and derivatives thereof or a polyester resin derivative comprising p-phenylene diacrylate and a polyhydric alcohol.
- 18. The method of claim 1, wherein said unexposed photosensitive material comprises ethylene glycol diacrylate and dimethacrylate, propylene glycol diacrylate and dimethacrylate, diethylene glycol diacrylate and dimethacrylate, triethylene glycol diacrylate and dimethacrylate, dipropylene glycol diacrylate and dimethacrylate, trimethylolethane triacrylate and trimethacrylate, trimethylolpropane triacrylate and trimethacrylate, tetramethylolmethane tetracrylate and tetramethacrylate, methylene-bis-acrylamide or 1,6-hexamethylene-bis-acrylamide.
- 19. The method of claim 1, wherein prior to oxidzing said aluminum plate is grained, etched and cleaned.
- 20. The method of claim 19, wherein said etching is with sodium hydroxide and said cleaning is with nitric acid.
- 21. The method of claim 20, wherein said photosensitive material is a 1,4-di-.beta.-hydroxyethoxycyclohexane-phenylene diacrylic acid condensate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
49-105291 |
Sep 1974 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 613,010, filed Sept. 12, 1975, now abandoned.
US Referenced Citations (6)
Non-Patent Literature Citations (1)
Entry |
Wernick et al., "The Surface Treatment and Finishing of Aluminum", 3rd ed., pp. 478-484, (1964). |
Continuations (1)
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Number |
Date |
Country |
Parent |
613010 |
Sep 1975 |
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