The present invention provides a method of imaging a printing plate precursor in which a printing plate precursor including a substrate and an image forming layer is imagewise contacted with a catalyst, for example, by imagewise ink-jet application. The image forming layer is then heated and develop
The present invention provides a method of imaging a printing plate precursor in which a printing plate precursor including a substrate and an image forming layer is imagewise contacted with a catalyst, for example, by imagewise ink-jet application. The image forming layer is then heated and developed in a suitable developer liquid such that portions of the image forming layer that are contacted with the catalyst resist development while portions of the image forming layer that are not contacted with the catalyst are removed during development.
대표청구항▼
What is claimed is: 1. A method of forming an image on a printing plate precursor comprising: providing a printing plate precursor comprising a substrate and a negative working oleophilic image forming layer applied onto the substrate, wherein the image forming layer comprises a polymeric binder co
What is claimed is: 1. A method of forming an image on a printing plate precursor comprising: providing a printing plate precursor comprising a substrate and a negative working oleophilic image forming layer applied onto the substrate, wherein the image forming layer comprises a polymeric binder consisting of polymeric material derived from phenol and a polymeric crosslinking material consisting of polymeric material derived from phenol; imagewise contacting the image forming layer with a catalyst comprising an acid; and thermally treating the image forming layer such that the polymeric material in imagewise contacted portions of the image forming layer undergoes a sufficient crosslinking reaction to cause the imagewise contacted portions of the image forming layer to become less developable in a developer liquid than portions of the image forming layer that are not contacted with the catalyst. 2. The method of claim 1 wherein the polymeric binder and the polymeric crosslinking agent consist of the same polymeric material which is capable of self-crosslinking upon thermal treatment in the presence of the catalyst. 3. The method of claim 1 wherein the polymeric binder consisting of polymeric material derived from phenol includes a novolak resin. 4. The method of claim 1 wherein the polymeric crosslinking material is capable of undergoing a condensation reaction with the polymeric binder upon thermal treatment in the presence of the catalyst. 5. The method of claim 1 wherein the polymeric crosslinking material is capable of undergoing a condensation reaction with the polymeric hinder upon thermal treatment at a temperature range of between about 20 and about 200째 C. in the presence of the catalyst. 6. The method of claim 1 wherein the polymeric crosslinking material consisting of polymeric material derived from phenol includes a resole resin. 7. The method of claim 6 wherein the resole resin is prepared from a C1-C5 alkylphenol and formaldehyde, a tetra C 1-C5 alkoxylmethyl glycoluril, poly(4-methoxymethylstyrene), poly[(N-methoxymethyl)acrylamide], poly[(N-iso-butoxymethyl)acrylamide], or a butylated phenolic resin. 8. The method of claim 1 wherein the polymeric binder consisting of polymeric material derived from phenol includes a novolak resin and the polymeric crosslinking material consisting of polymeric material derived from phenol includes a resole resin. 9. The method of claim 1 wherein the catalyst comprises a liquid mixture. 10. The method of claim 9 wherein the liquid mixture comprises polymeric binders, dispersing agents, humectants, biocides, surfactants, viscosity builders, colorants, pH adjusters, drying agents, defoamers or combinations thereof. 11. The method of claim 9 wherein the liquid mixture has a surface tension of between about 20 and about 60 dynes/cm. 12. The method of claim 9 wherein the liquid mixture has a surface tension of between about 30 and about 50 dynes/cm. 13. The method of claim 1 wherein the thermal treatment step comprises heating the image forming layer at between about 20 and about 200째 C. 14. The method of claim 1 wherein the thermal treatment step comprises heating the image forming layer at between about 75 and about 150째 C. 15. The method of claim 1 wherein the thermal treatment step comprises heating the image forming layer at between about 90 and about 130째 C. 16. The method of claim 1 wherein thermal treatment step occurs for between about 15 and about 300 seconds. 17. The method of claim 1 wherein the thermal treatment step occurs for between about 30 and about 90 seconds. 18. The method of claim 1 further comprising the step of contacting the image forming layer with a developer liquid to remove the portions of the image forming layer that are not contacted with the catalyst. 19. The method of claim 18 wherein the developer liquid comprises an aqueous alkaline developer. 20. The method of claim 18 wherein the developer liquid has a pH of at least about 11. 21. The method of claim 18 wherein the developer liquid has a pH of at least about 12. 22. The method of claim 18 wherein the developer liquid has a pH of between about 12 and about 14. 23. The method of claim 18 wherein the developer liquid comprises at least one metal silicate. 24. The method of claim 23 wherein the developer liquid has a ratio of silicon oxide to metal oxide of at least about 0.3. 25. The method of claim 23 wherein the developer liquid has a ratio of silicon oxide to metal oxide of between about 0.3 and about 12. 26. The method of claim 23 wherein the developer liquid has a ratio of silicon oxide to metal oxide of between about 0.6 to about 1.1. 27. The method of claim 23 wherein the developer liquid has a ratio of silicon oxide to metal oxide of between about 0.7 to about 1.0. 28. The method of claim 23 wherein the metal silicate comprises lithium silicate, sodium silicate, potassium silicate or a combination thereof. 29. The method of claim 18 wherein the developer liquid is free of organic solvents. 30. The method of claim 18 wherein the developer liquid comprises at least one hydroxide moiety. 31. The method of claim 30 wherein the developer liquid comprises ammonium hydroxide, sodium hydroxide, lithium hydroxide, potassium hydroxide or a combination thereof. 32. The method of claim 18 wherein the developer liquid comprises a combination of a metal silicate and a hydroxide containing compound. 33. A method of forming an image on a printing plate precursor comprising: providing a printing plate precursor comprising a substrate and a negative working oleophilic image forming layer applied onto the substrate, wherein the image forming layer comprises at least one polymeric material comprising a poly(4-hydroxystyrene), poly(4-hydroxystyrene/methylmethacrylate), poly(2-hydroxyethylmethacrylate/cyclohexylmethacrylate), poly(2-hydroxyethylmethacrylate/methylmethacrylate), poly(styrene/butylmethacrylate/methylmethacrylate/methacrylic acid), poly(butylmethacrylate/methacrylic acid), poly(vinylphenol/2-hydroxyethylmethacrylate), poly(styrene/n-butylmethacrylate/2-hydroxyethylmethacrylate/methacrylic acid), poly(styrene/ethylmethacrylate/2-hydroxyethylmethacrylate/methacrylic acid), poly(N-methoxymethyl methacrylamide/2-phenylethyl methacrylate/methacrylic acid) or combinations or derivatives thereof; imagewise contacting the image forming layer with a catalyst comprising an acid; and thermally treating the image forming layer such that the polymeric material in imagewise contacted portions of the image forming layer undergoes a sufficient crosslinking reaction to cause the imagewise contacted portions of the image forming layer to become less developable in a developer liquid than portions of the image forming layer that are not contacted with the catalyst. 34. A method of forming an image on a printing plate precursor comprising: providing a printing plate precursor comprising a substrate and a negative working oleophilic image forming layer applied onto the substrate, wherein the image forming layer comprises at least one polymeric material comprising a C1-C5 alkoxymethyl melamine resin, a C1-C5 alkoxymethyl glycoluril resin, a poly(C1-C5 alkoxy-methylstyrene) resin, a poly(C 1-C5-alkoxymethylacrylamide) resin or a derivative or combination thereof; imagewise contacting the image forming layer with a catalyst comprising an acid; and thermally treating the image forming layer such that the polymeric material in imagewise contacted portions of the image forming layer undergoes a sufficient crosslinking reaction to cause the imagewise contacted portions of the image forming layer to become less developable in a developer liquid than portions of the image forming layer that are not contacted with the catalyst.
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이 특허에 인용된 특허 (14)
Deutsch, Albert S.; David, Lawrence D.; West, David B., Chemical imaging of a lithographic printing plate.
Ma Sheau-Hwa (Chadds Ford PA) West Michael W. J. (Wilmington DE), Method for preparing negative-working wash-off relief images and non-photosensitive elements for use therein.
Gerber H. Joseph (West Hartford CT) Croft Russell F. (Tolland CT) Sullivan Daniel J. (Hartford CT), Method of forming a photomask for a printing plate with an ink jet.
Aurenty Patrice M. ; Shah Ajay ; Shimazu Ken-Ichi, Printable media for lithographic printing having a porous, hydrophilic layer and a method for the production thereof.
Haley Neil F. (Wellington CO) Corbiere Steven L. (Windsor CO), Radiation-sensitive composition containing a resole resin and a novolac resin and use thereof in lithographic printing p.
Nguyen My T. ; Saraiya Shashikant ; Mikell Frederic E. ; Shimazu Ken-ichi ; Pappas S. Peter ; Hallman Robert W. ; Shah Ajay ; Timpe Hans-Joachim,DEX ; Savariar-Hauck Celin,DEX, Radiation-sensitive compositions and printing plates.
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