Claims
- 1. A lithographic printing member directly imageable by laser discharge, the member comprising:
- a. a topmost first layer which is polymeric; and
- b. a second layer underlying the first layer; and
- c. a substrate underlying the second layer;
- wherein
- d. the second layer is formed of a material which is subject to ablative absorption of imaging infrared radiation and the first layer is not; and
- e. the first layer and the substrate exhibit different affinities for at least one printing liquid selected from the group consisting of ink and an adhesive fluid for ink.
- 2. The member of claim 1 wherein the second layer is a conducting polymer.
- 3. The member of claim 1 wherein the second layer includes a dispersion of solid particulate nigrosine.
- 4. The member of claim 1 wherein the second layer includes solubilized nigrosine.
- 5. The member of claim 1 wherein the second layer is a nitrocellulose film containing a dispersion of carbon-black particles.
- 6. The member of claim 1 wherein the second layer is a polyester film containing a dispersion of carbon-black particles.
- 7. The member of claim 1 wherein the second layer is a polyimide film containing a dispersion of carbon-black particles.
- 8. The member of claim 1 wherein the second layer is a polycarbonate film containing a dispersion of carbon-black particles.
- 9. The member of claim 1 wherein the second layer is a vinyl film containing a dispersion of carbon-black particles.
- 10. The member of claim 1 wherein the substrate is at least 5 mils thick.
- 11. The member of claim 1 further comprising a metal layer onto which the substrate is laminated.
- 12. The member of claim 1 wherein the substrate is a metal layer.
- 13. The member of claim 1 wherein the second layer is cross-linked.
- 14. The member of claim 13 wherein the second layer is cross-linked by a melamine formaldehyde-based compound.
- 15. The member of claim 1 wherein the second layer is titanium oxide.
- 16. The member of claim 1 further comprising a primer layer disposed between the substrate and the second layer.
- 17. The member of claim 1 further comprising an infrared-reflective layer disposed between the substrate and second layer.
- 18. The member of claim 17 wherein the reflective layer is metal.
- 19. The member of claim 17 wherein the reflective layer is aluminum that reflects at least 99% of incident IR radiation.
- 20. The plate of claim 17 wherein the reflective layer contains a pigment that reflects IR radiation.
- 21. The plate of claim 1 further comprising a thin-metal, IR-absorptive layer disposed between the substrate and second layer.
- 22. The plate of claim 21 further comprising an adhesion-promoting layer disposed between the substrate and the thin-metal layer.
- 23. The plate of claim 22 wherein the substrate and the adhesion-promoting layer together represent a print- or coatability-treated polyester film.
- 24. The plate of claim 21 wherein the absorptive layer transmits at least 5% but not more than 70% of IR radiation incident thereon.
- 25. The plate of claim 1 further comprising a thin-metal, IR-absorptive layer disposed between the first and second layers.
- 26. The plate of claim 25 wherein the absorptive layer transmits at least 5% but not more than 70% of IR radiation incident thereon.
- 27. The member of claim 1 wherein the topmost layer is oleophobic and the substrate is oleophilic.
- 28. The member of claim 1 wherein the topmost layer is hydrophilic and the substrate is oleophilic.
- 29. The member of claim 1 wherein the second layer contains a dispersion of conductive carbon-black particles.
- 30. The member of claim 29 wherein the carbon-black particles are Vulcan XC-72.
- 31. The member of claim 1 wherein the substrate is transparent to infrared radiation.
- 32. The member of claim 31 further comprising an infrared-reflective layer disposed between the first and second layers.
- 33. The plate of claim 32 wherein the reflective layer is metal.
- 34. The member of claim 32 wherein the reflective layer is aluminum that reflects at least 99% of incident IR radiation.
- 35. The plate of claim 32 wherein the reflective layer contains a pigment that reflects IR radiation.
- 36. The member of claim 1 wherein the substrate is aluminum.
Parent Case Info
RELATED APPLICATION
This is a continuation-in-part of Ser. No. 07/917,481, filed on Jul. 20, 1992.
US Referenced Citations (68)
Foreign Referenced Citations (8)
Number |
Date |
Country |
160396 |
Nov 1985 |
EPX |
3714157 |
Nov 1988 |
DEX |
235789 |
Sep 1990 |
JPX |
3197190 |
Aug 1991 |
JPX |
3197191 |
Aug 1991 |
JPX |
3197192 |
Aug 1991 |
JPX |
5-8367 |
Jan 1993 |
JPX |
9207716 |
May 1992 |
WOX |
Non-Patent Literature Citations (3)
Entry |
Molecular and Dynamic Studies On Lase Abalation Of Doped Polymer Systems, 17 Polymer News (1991). |
E. B. Cargill et al., A Report On Polaroid's New Dry Imaging Technology For Generating 8.times.10 Radiographic Films (Jan. 1993). |
E. B. Cargill et al., A Report On The Image Quality Characteristics Of The Polaroid Helios Laser System (Oct. 1992). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
917481 |
Jul 1992 |
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